Merge git://git.linux-nfs.org/pub/linux/nfs-2.6

* git://git.linux-nfs.org/pub/linux/nfs-2.6: (131 commits)
NFSv4: Fix a typo in nfs_inode_reclaim_delegation
NFS: Add a boot parameter to disable 64 bit inode numbers
NFS: nfs_refresh_inode should clear cache_validity flags on success
NFS: Fix a connectathon regression in NFSv3 and NFSv4
NFS: Use nfs_refresh_inode() in ops that aren't expected to change the inode
SUNRPC: Don't call xprt_release in call refresh
SUNRPC: Don't call xprt_release() if call_allocate fails
SUNRPC: Fix buggy UDP transmission
[23/37] Clean up duplicate includes in
[2.6 patch] net/sunrpc/rpcb_clnt.c: make struct rpcb_program static
SUNRPC: Use correct type in buffer length calculations
SUNRPC: Fix default hostname created in rpc_create()
nfs: add server port to rpc_pipe info file
NFS: Get rid of some obsolete macros
NFS: Simplify filehandle revalidation
NFS: Ensure that nfs_link() returns a hashed dentry
NFS: Be strict about dentry revalidation when doing exclusive create
NFS: Don't zap the readdir caches upon error
NFS: Remove the redundant nfs_reval_fsid()
NFSv3: Always use directory post-op attributes in nfs3_proc_lookup
...

Fix up trivial conflict due to sock_owned_by_user() cleanup manually in
net/sunrpc/xprtsock.c

Documentation/kernel-parameters.txt

···
 			[NFS] set the maximum lifetime for idmapper cache
 			entries.
 
+	nfs.enable_ino64=
+			[NFS] enable 64-bit inode numbers.
+			If zero, the NFS client will fake up a 32-bit inode
+			number for the readdir() and stat() syscalls instead
+			of returning the full 64-bit number.
+			The default is to return 64-bit inode numbers.
+
 	nmi_watchdog=	[KNL,BUGS=X86-32] Debugging features for SMP kernels
 
 	no387		[BUGS=X86-32] Tells the kernel to use the 387 maths

fs/Kconfig

···
 config SUNRPC_GSS
 	tristate
 
+config SUNRPC_XPRT_RDMA
+	tristate "RDMA transport for sunrpc (EXPERIMENTAL)"
+	depends on SUNRPC && INFINIBAND && EXPERIMENTAL
+	default m
+	help
+	  Adds a client RPC transport for supporting kernel NFS over RDMA
+	  mounts, including Infiniband and iWARP. Experimental.
+
 config SUNRPC_BIND34
 	bool "Support for rpcbind versions 3 & 4 (EXPERIMENTAL)"
 	depends on SUNRPC && EXPERIMENTAL

fs/lockd/mon.c

···
 #include <linux/utsname.h>
 #include <linux/kernel.h>
 #include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/xprtsock.h>
 #include <linux/sunrpc/svc.h>
 #include <linux/lockd/lockd.h>
 #include <linux/lockd/sm_inter.h>
···
 		.sin_port	= 0,
 	};
 	struct rpc_create_args args = {
-		.protocol	= IPPROTO_UDP,
+		.protocol	= XPRT_TRANSPORT_UDP,
 		.address	= (struct sockaddr *)&sin,
 		.addrsize	= sizeof(sin),
 		.servername	= "localhost",

fs/lockd/xdr.c

···
 	}
 	else 
 	{
-		printk(KERN_NOTICE
-			"lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN);
+		dprintk("lockd: bad cookie size %d (only cookies under "
+			"%d bytes are supported.)\n",
+				len, NLM_MAXCOOKIELEN);
 		return NULL;
 	}
 	return p;
···
 	unsigned int	len;
 
 	if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
-		printk(KERN_NOTICE
-			"lockd: bad fhandle size %d (should be %d)\n",
+		dprintk("lockd: bad fhandle size %d (should be %d)\n",
 			len, NFS2_FHSIZE);
 		return NULL;
 	}

fs/lockd/xdr4.c

···
 	}
 	else 
 	{
-		printk(KERN_NOTICE
-			"lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN);
+		dprintk("lockd: bad cookie size %d (only cookies under "
+			"%d bytes are supported.)\n",
+				len, NLM_MAXCOOKIELEN);
 		return NULL;
 	}
 	return p;
···
 	memset(f->data, 0, sizeof(f->data));
 	f->size = ntohl(*p++);
 	if (f->size > NFS_MAXFHSIZE) {
-		printk(KERN_NOTICE
-			"lockd: bad fhandle size %d (should be <=%d)\n",
+		dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
 			f->size, NFS_MAXFHSIZE);
 		return NULL;
 	}

fs/nfs/Makefile

···
 			   nfs4namespace.o
 nfs-$(CONFIG_NFS_DIRECTIO) += direct.o
 nfs-$(CONFIG_SYSCTL) += sysctl.o
-nfs-objs		:= $(nfs-y)

fs/nfs/client.c

···
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/stats.h>
 #include <linux/sunrpc/metrics.h>
+#include <linux/sunrpc/xprtsock.h>
+#include <linux/sunrpc/xprtrdma.h>
 #include <linux/nfs_fs.h>
 #include <linux/nfs_mount.h>
 #include <linux/nfs4_mount.h>
···
 		to->to_retries = 2;
 
 	switch (proto) {
-	case IPPROTO_TCP:
+	case XPRT_TRANSPORT_TCP:
+	case XPRT_TRANSPORT_RDMA:
 		if (!to->to_initval)
 			to->to_initval = 60 * HZ;
 		if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
···
 		to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
 		to->to_exponential = 0;
 		break;
-	case IPPROTO_UDP:
+	case XPRT_TRANSPORT_UDP:
 	default:
 		if (!to->to_initval)
 			to->to_initval = 11 * HZ / 10;
···
 /*
  * Initialise an NFS2 or NFS3 client
  */
-static int nfs_init_client(struct nfs_client *clp, const struct nfs_mount_data *data)
+static int nfs_init_client(struct nfs_client *clp,
+			   const struct nfs_parsed_mount_data *data)
 {
-	int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
 	int error;
 
 	if (clp->cl_cons_state == NFS_CS_READY) {
···
 	 * Create a client RPC handle for doing FSSTAT with UNIX auth only
 	 * - RFC 2623, sec 2.3.2
 	 */
-	error = nfs_create_rpc_client(clp, proto, data->timeo, data->retrans,
-					RPC_AUTH_UNIX, 0);
+	error = nfs_create_rpc_client(clp, data->nfs_server.protocol,
+				data->timeo, data->retrans, RPC_AUTH_UNIX, 0);
 	if (error < 0)
 		goto error;
 	nfs_mark_client_ready(clp, NFS_CS_READY);
···
 /*
  * Create a version 2 or 3 client
  */
-static int nfs_init_server(struct nfs_server *server, const struct nfs_mount_data *data)
+static int nfs_init_server(struct nfs_server *server,
+			   const struct nfs_parsed_mount_data *data)
 {
 	struct nfs_client *clp;
 	int error, nfsvers = 2;
···
 #endif
 
 	/* Allocate or find a client reference we can use */
-	clp = nfs_get_client(data->hostname, &data->addr, nfsvers);
+	clp = nfs_get_client(data->nfs_server.hostname,
+				&data->nfs_server.address, nfsvers);
 	if (IS_ERR(clp)) {
 		dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
 		return PTR_ERR(clp);
···
 	if (error < 0)
 		goto error;
 
-	error = nfs_init_server_rpcclient(server, data->pseudoflavor);
+	error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
 	if (error < 0)
 		goto error;
 
···
  * Create a version 2 or 3 volume record
  * - keyed on server and FSID
  */
-struct nfs_server *nfs_create_server(const struct nfs_mount_data *data,
+struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
 				     struct nfs_fh *mntfh)
 {
 	struct nfs_server *server;
···
  * Create a version 4 volume record
  */
 static int nfs4_init_server(struct nfs_server *server,
-		const struct nfs4_mount_data *data, rpc_authflavor_t authflavour)
+		const struct nfs_parsed_mount_data *data)
 {
 	int error;
 
···
 	server->acdirmin = data->acdirmin * HZ;
 	server->acdirmax = data->acdirmax * HZ;
 
-	error = nfs_init_server_rpcclient(server, authflavour);
+	error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
 
 	/* Done */
 	dprintk("<-- nfs4_init_server() = %d\n", error);
···
  * Create a version 4 volume record
  * - keyed on server and FSID
  */
-struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *data,
-				      const char *hostname,
-				      const struct sockaddr_in *addr,
-				      const char *mntpath,
-				      const char *ip_addr,
-				      rpc_authflavor_t authflavour,
+struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
 				      struct nfs_fh *mntfh)
 {
 	struct nfs_fattr fattr;
···
 		return ERR_PTR(-ENOMEM);
 
 	/* Get a client record */
-	error = nfs4_set_client(server, hostname, addr, ip_addr, authflavour,
-			data->proto, data->timeo, data->retrans);
+	error = nfs4_set_client(server,
+			data->nfs_server.hostname,
+			&data->nfs_server.address,
+			data->client_address,
+			data->auth_flavors[0],
+			data->nfs_server.protocol,
+			data->timeo, data->retrans);
 	if (error < 0)
 		goto error;
 
 	/* set up the general RPC client */
-	error = nfs4_init_server(server, data, authflavour);
+	error = nfs4_init_server(server, data);
 	if (error < 0)
 		goto error;
 
···
 	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
 
 	/* Probe the root fh to retrieve its FSID */
-	error = nfs4_path_walk(server, mntfh, mntpath);
+	error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
 	if (error < 0)
 		goto error;
 

fs/nfs/delegation.c

···
 	for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
 		if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
 			continue;
-		if ((struct nfs_open_context *)fl->fl_file->private_data != ctx)
+		if (nfs_file_open_context(fl->fl_file) != ctx)
 			continue;
 		status = nfs4_lock_delegation_recall(state, fl);
 		if (status >= 0)
···
 void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res)
 {
 	struct nfs_delegation *delegation = NFS_I(inode)->delegation;
+	struct rpc_cred *oldcred;
 
 	if (delegation == NULL)
 		return;
···
 			sizeof(delegation->stateid.data));
 	delegation->type = res->delegation_type;
 	delegation->maxsize = res->maxsize;
-	put_rpccred(cred);
+	oldcred = delegation->cred;
 	delegation->cred = get_rpccred(cred);
 	delegation->flags &= ~NFS_DELEGATION_NEED_RECLAIM;
 	NFS_I(inode)->delegation_state = delegation->type;
 	smp_wmb();
+	put_rpccred(oldcred);
 }
 
 /*

fs/nfs/dir.c

···
 	desc->timestamp = timestamp;
 	desc->timestamp_valid = 1;
 	SetPageUptodate(page);
-	spin_lock(&inode->i_lock);
-	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
-	spin_unlock(&inode->i_lock);
 	/* Ensure consistent page alignment of the data.
 	 * Note: assumes we have exclusive access to this mapping either
 	 *	 through inode->i_mutex or some other mechanism.
···
 	unlock_page(page);
 	return 0;
  error:
-	SetPageError(page);
 	unlock_page(page);
-	nfs_zap_caches(inode);
 	desc->error = error;
 	return -EIO;
 }
···
 	struct file	*file = desc->file;
 	struct nfs_entry *entry = desc->entry;
 	struct dentry	*dentry = NULL;
-	unsigned long	fileid;
+	u64		fileid;
 	int		loop_count = 0,
 			res;
 
···
 		unsigned d_type = DT_UNKNOWN;
 		/* Note: entry->prev_cookie contains the cookie for
 		 *	 retrieving the current dirent on the server */
-		fileid = nfs_fileid_to_ino_t(entry->ino);
+		fileid = entry->ino;
 
 		/* Get a dentry if we have one */
 		if (dentry != NULL)
···
 		/* Use readdirplus info */
 		if (dentry != NULL && dentry->d_inode != NULL) {
 			d_type = dt_type(dentry->d_inode);
-			fileid = dentry->d_inode->i_ino;
+			fileid = NFS_FILEID(dentry->d_inode);
 		}
 
 		res = filldir(dirent, entry->name, entry->len, 
-			      file->f_pos, fileid, d_type);
+			      file->f_pos, nfs_compat_user_ino64(fileid),
+			      d_type);
 		if (res < 0)
 			break;
 		file->f_pos++;
···
 						page,
 						NFS_SERVER(inode)->dtsize,
 						desc->plus);
-	spin_lock(&inode->i_lock);
-	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
-	spin_unlock(&inode->i_lock);
 	desc->page = page;
 	desc->ptr = kmap(page);		/* matching kunmap in nfs_do_filldir */
 	if (desc->error >= 0) {
···
 	memset(desc, 0, sizeof(*desc));
 
 	desc->file = filp;
-	desc->dir_cookie = &((struct nfs_open_context *)filp->private_data)->dir_cookie;
+	desc->dir_cookie = &nfs_file_open_context(filp)->dir_cookie;
 	desc->decode = NFS_PROTO(inode)->decode_dirent;
 	desc->plus = NFS_USE_READDIRPLUS(inode);
 
···
 	}
 	if (offset != filp->f_pos) {
 		filp->f_pos = offset;
-		((struct nfs_open_context *)filp->private_data)->dir_cookie = 0;
+		nfs_file_open_context(filp)->dir_cookie = 0;
 	}
 out:
 	mutex_unlock(&filp->f_path.dentry->d_inode->i_mutex);
···
  */
 static int nfs_check_verifier(struct inode *dir, struct dentry *dentry)
 {
-	unsigned long verf;
-
 	if (IS_ROOT(dentry))
 		return 1;
-	verf = dentry->d_time;
-	if (nfs_caches_unstable(dir)
-			|| verf != NFS_I(dir)->cache_change_attribute)
+	if (!nfs_verify_change_attribute(dir, dentry->d_time))
+		return 0;
+	/* Revalidate nfsi->cache_change_attribute before we declare a match */
+	if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)
+		return 0;
+	if (!nfs_verify_change_attribute(dir, dentry->d_time))
 		return 0;
 	return 1;
-}
-
-static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
-{
-	dentry->d_time = verf;
-}
-
-static void nfs_refresh_verifier(struct dentry * dentry, unsigned long verf)
-{
-	nfs_set_verifier(dentry, verf);
-}
-
-/*
- * Whenever an NFS operation succeeds, we know that the dentry
- * is valid, so we update the revalidation timestamp.
- */
-static inline void nfs_renew_times(struct dentry * dentry)
-{
-	dentry->d_time = jiffies;
 }
 
 /*
···
 	if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT))
 		return 0;
 	return nd->flags & mask;
+}
+
+/*
+ * Use intent information to check whether or not we're going to do
+ * an O_EXCL create using this path component.
+ */
+static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd)
+{
+	if (NFS_PROTO(dir)->version == 2)
+		return 0;
+	if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0)
+		return 0;
+	return (nd->intent.open.flags & O_EXCL) != 0;
 }
 
 /*
···
 				(S_ISREG(inode->i_mode) ||
 				 S_ISDIR(inode->i_mode)))
 			goto out_force;
+		return 0;
 	}
 	return nfs_revalidate_inode(server, inode);
 out_force:
···
 	int error;
 	struct nfs_fh fhandle;
 	struct nfs_fattr fattr;
-	unsigned long verifier;
 
 	parent = dget_parent(dentry);
 	lock_kernel();
 	dir = parent->d_inode;
 	nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
 	inode = dentry->d_inode;
-
-	/* Revalidate parent directory attribute cache */
-	if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)
-		goto out_zap_parent;
 
 	if (!inode) {
 		if (nfs_neg_need_reval(dir, dentry, nd))
···
 	}
 
 	/* Force a full look up iff the parent directory has changed */
-	if (nfs_check_verifier(dir, dentry)) {
+	if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) {
 		if (nfs_lookup_verify_inode(inode, nd))
 			goto out_zap_parent;
 		goto out_valid;
···
 	if (NFS_STALE(inode))
 		goto out_bad;
 
-	verifier = nfs_save_change_attribute(dir);
 	error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
 	if (error)
 		goto out_bad;
···
 	if ((error = nfs_refresh_inode(inode, &fattr)) != 0)
 		goto out_bad;
 
-	nfs_renew_times(dentry);
-	nfs_refresh_verifier(dentry, verifier);
+	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
  out_valid:
 	unlock_kernel();
 	dput(parent);
···
 out_zap_parent:
 	nfs_zap_caches(dir);
  out_bad:
-	NFS_CACHEINV(dir);
+	nfs_mark_for_revalidate(dir);
 	if (inode && S_ISDIR(inode->i_mode)) {
 		/* Purge readdir caches. */
 		nfs_zap_caches(inode);
···
 		nfs_complete_unlink(dentry, inode);
 		unlock_kernel();
 	}
-	/* When creating a negative dentry, we want to renew d_time */
-	nfs_renew_times(dentry);
 	iput(inode);
 }
 
···
 	.d_delete	= nfs_dentry_delete,
 	.d_iput		= nfs_dentry_iput,
 };
-
-/*
- * Use intent information to check whether or not we're going to do
- * an O_EXCL create using this path component.
- */
-static inline
-int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd)
-{
-	if (NFS_PROTO(dir)->version == 2)
-		return 0;
-	if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0)
-		return 0;
-	return (nd->intent.open.flags & O_EXCL) != 0;
-}
-
-static inline int nfs_reval_fsid(struct inode *dir, const struct nfs_fattr *fattr)
-{
-	struct nfs_server *server = NFS_SERVER(dir);
-
-	if (!nfs_fsid_equal(&server->fsid, &fattr->fsid))
-		/* Revalidate fsid using the parent directory */
-		return __nfs_revalidate_inode(server, dir);
-	return 0;
-}
 
 static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
 {
···
 		res = ERR_PTR(error);
 		goto out_unlock;
 	}
-	error = nfs_reval_fsid(dir, &fattr);
-	if (error < 0) {
-		res = ERR_PTR(error);
-		goto out_unlock;
-	}
 	inode = nfs_fhget(dentry->d_sb, &fhandle, &fattr);
 	res = (struct dentry *)inode;
 	if (IS_ERR(res))
···
 no_entry:
 	res = d_materialise_unique(dentry, inode);
 	if (res != NULL) {
-		struct dentry *parent;
 		if (IS_ERR(res))
 			goto out_unlock;
-		/* Was a directory renamed! */
-		parent = dget_parent(res);
-		if (!IS_ROOT(parent))
-			nfs_mark_for_revalidate(parent->d_inode);
-		dput(parent);
 		dentry = res;
 	}
-	nfs_renew_times(dentry);
 	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 out_unlock:
 	unlock_kernel();
···
 	}
 	dentry->d_op = NFS_PROTO(dir)->dentry_ops;
 
-	/* Let vfs_create() deal with O_EXCL */
+	/* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash
+	 * the dentry. */
 	if (nd->intent.open.flags & O_EXCL) {
-		d_add(dentry, NULL);
+		d_instantiate(dentry, NULL);
 		goto out;
 	}
 
 	/* Open the file on the server */
 	lock_kernel();
-	/* Revalidate parent directory attribute cache */
-	error = nfs_revalidate_inode(NFS_SERVER(dir), dir);
-	if (error < 0) {
-		res = ERR_PTR(error);
-		unlock_kernel();
-		goto out;
-	}
-
-	if (nd->intent.open.flags & O_CREAT) {
-		nfs_begin_data_update(dir);
-		res = nfs4_atomic_open(dir, dentry, nd);
-		nfs_end_data_update(dir);
-	} else
-		res = nfs4_atomic_open(dir, dentry, nd);
+	res = nfs4_atomic_open(dir, dentry, nd);
 	unlock_kernel();
 	if (IS_ERR(res)) {
 		error = PTR_ERR(res);
···
 		}
 	} else if (res != NULL)
 		dentry = res;
-	nfs_renew_times(dentry);
-	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 out:
 	return res;
 no_open:
···
 	struct dentry *parent = NULL;
 	struct inode *inode = dentry->d_inode;
 	struct inode *dir;
-	unsigned long verifier;
 	int openflags, ret = 0;
 
 	parent = dget_parent(dentry);
···
 	/* We can't create new files in nfs_open_revalidate(), so we
 	 * optimize away revalidation of negative dentries.
 	 */
-	if (inode == NULL)
+	if (inode == NULL) {
+		if (!nfs_neg_need_reval(dir, dentry, nd))
+			ret = 1;
 		goto out;
+	}
+
 	/* NFS only supports OPEN on regular files */
 	if (!S_ISREG(inode->i_mode))
 		goto no_open;
···
 	 * change attribute *before* we do the RPC call.
 	 */
 	lock_kernel();
-	verifier = nfs_save_change_attribute(dir);
 	ret = nfs4_open_revalidate(dir, dentry, openflags, nd);
-	if (!ret)
-		nfs_refresh_verifier(dentry, verifier);
 	unlock_kernel();
 out:
 	dput(parent);
···
 		.len = entry->len,
 	};
 	struct inode *inode;
+	unsigned long verf = nfs_save_change_attribute(dir);
 
 	switch (name.len) {
 		case 2:
···
 			if (name.name[0] == '.')
 				return dget(parent);
 	}
+
+	spin_lock(&dir->i_lock);
+	if (NFS_I(dir)->cache_validity & NFS_INO_INVALID_DATA) {
+		spin_unlock(&dir->i_lock);
+		return NULL;
+	}
+	spin_unlock(&dir->i_lock);
+
 	name.hash = full_name_hash(name.name, name.len);
 	dentry = d_lookup(parent, &name);
 	if (dentry != NULL) {
···
 		dentry = alias;
 	}
 
-	nfs_renew_times(dentry);
-	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
-	return dentry;
 out_renew:
-	nfs_renew_times(dentry);
-	nfs_refresh_verifier(dentry, nfs_save_change_attribute(dir));
+	nfs_set_verifier(dentry, verf);
 	return dentry;
 }
 
···
 int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle,
 				struct nfs_fattr *fattr)
 {
+	struct dentry *parent = dget_parent(dentry);
+	struct inode *dir = parent->d_inode;
 	struct inode *inode;
 	int error = -EACCES;
 
+	d_drop(dentry);
+
 	/* We may have been initialized further down */
 	if (dentry->d_inode)
-		return 0;
+		goto out;
 	if (fhandle->size == 0) {
-		struct inode *dir = dentry->d_parent->d_inode;
 		error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr);
 		if (error)
-			return error;
+			goto out_error;
 	}
+	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 	if (!(fattr->valid & NFS_ATTR_FATTR)) {
 		struct nfs_server *server = NFS_SB(dentry->d_sb);
 		error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr);
 		if (error < 0)
-			return error;
+			goto out_error;
 	}
 	inode = nfs_fhget(dentry->d_sb, fhandle, fattr);
 	error = PTR_ERR(inode);
 	if (IS_ERR(inode))
-		return error;
-	d_instantiate(dentry, inode);
-	if (d_unhashed(dentry))
-		d_rehash(dentry);
+		goto out_error;
+	d_add(dentry, inode);
+out:
+	dput(parent);
 	return 0;
+out_error:
+	nfs_mark_for_revalidate(dir);
+	dput(parent);
+	return error;
 }
 
 /*
···
 		open_flags = nd->intent.open.flags;
 
 	lock_kernel();
-	nfs_begin_data_update(dir);
 	error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, nd);
-	nfs_end_data_update(dir);
 	if (error != 0)
 		goto out_err;
-	nfs_renew_times(dentry);
-	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 	unlock_kernel();
 	return 0;
 out_err:
···
 	attr.ia_valid = ATTR_MODE;
 
 	lock_kernel();
-	nfs_begin_data_update(dir);
 	status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev);
-	nfs_end_data_update(dir);
 	if (status != 0)
 		goto out_err;
-	nfs_renew_times(dentry);
-	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 	unlock_kernel();
 	return 0;
 out_err:
···
 	attr.ia_mode = mode | S_IFDIR;
 
 	lock_kernel();
-	nfs_begin_data_update(dir);
 	error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr);
-	nfs_end_data_update(dir);
 	if (error != 0)
 		goto out_err;
-	nfs_renew_times(dentry);
-	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 	unlock_kernel();
 	return 0;
 out_err:
···
 			dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
 
 	lock_kernel();
-	nfs_begin_data_update(dir);
 	error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
 	/* Ensure the VFS deletes this inode */
 	if (error == 0 && dentry->d_inode != NULL)
 		clear_nlink(dentry->d_inode);
-	nfs_end_data_update(dir);
 	unlock_kernel();
 
 	return error;
···
 static int nfs_sillyrename(struct inode *dir, struct dentry *dentry)
 {
 	static unsigned int sillycounter;
-	const int      i_inosize  = sizeof(dir->i_ino)*2;
+	const int      fileidsize  = sizeof(NFS_FILEID(dentry->d_inode))*2;
 	const int      countersize = sizeof(sillycounter)*2;
-	const int      slen       = sizeof(".nfs") + i_inosize + countersize - 1;
+	const int      slen        = sizeof(".nfs")+fileidsize+countersize-1;
 	char           silly[slen+1];
 	struct qstr    qsilly;
 	struct dentry *sdentry;
···
 	if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
 		goto out;
 
-	sprintf(silly, ".nfs%*.*lx",
-		i_inosize, i_inosize, dentry->d_inode->i_ino);
+	sprintf(silly, ".nfs%*.*Lx",
+		fileidsize, fileidsize,
+		(unsigned long long)NFS_FILEID(dentry->d_inode));
 
 	/* Return delegation in anticipation of the rename */
 	nfs_inode_return_delegation(dentry->d_inode);
···
 
 	qsilly.name = silly;
 	qsilly.len  = strlen(silly);
-	nfs_begin_data_update(dir);
 	if (dentry->d_inode) {
-		nfs_begin_data_update(dentry->d_inode);
 		error = NFS_PROTO(dir)->rename(dir, &dentry->d_name,
 				dir, &qsilly);
 		nfs_mark_for_revalidate(dentry->d_inode);
-		nfs_end_data_update(dentry->d_inode);
 	} else
 		error = NFS_PROTO(dir)->rename(dir, &dentry->d_name,
 				dir, &qsilly);
-	nfs_end_data_update(dir);
 	if (!error) {
-		nfs_renew_times(dentry);
 		nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 		d_move(dentry, sdentry);
 		error = nfs_async_unlink(dir, dentry);
···
 		goto out;
 	}
 
-	nfs_begin_data_update(dir);
 	if (inode != NULL) {
 		nfs_inode_return_delegation(inode);
-		nfs_begin_data_update(inode);
 		error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
 		/* The VFS may want to delete this inode */
 		if (error == 0)
 			drop_nlink(inode);
 		nfs_mark_for_revalidate(inode);
-		nfs_end_data_update(inode);
 	} else
 		error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
-	nfs_end_data_update(dir);
 out:
 	return error;
 }
···
 	spin_unlock(&dcache_lock);
 	error = nfs_safe_remove(dentry);
 	if (!error) {
-		nfs_renew_times(dentry);
 		nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 	} else if (need_rehash)
 		d_rehash(dentry);
···
 		memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen);
 	kunmap_atomic(kaddr, KM_USER0);
 
-	nfs_begin_data_update(dir);
 	error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr);
-	nfs_end_data_update(dir);
 	if (error != 0) {
 		dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n",
 			dir->i_sb->s_id, dir->i_ino,
···
 		dentry->d_parent->d_name.name, dentry->d_name.name);
 
 	lock_kernel();
-	nfs_begin_data_update(dir);
-	nfs_begin_data_update(inode);
+	d_drop(dentry);
 	error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
 	if (error == 0) {
 		atomic_inc(&inode->i_count);
-		d_instantiate(dentry, inode);
+		d_add(dentry, inode);
 	}
-	nfs_end_data_update(inode);
-	nfs_end_data_update(dir);
 	unlock_kernel();
 	return error;
 }
···
 		d_delete(new_dentry);
 	}
 
-	nfs_begin_data_update(old_dir);
-	nfs_begin_data_update(new_dir);
-	nfs_begin_data_update(old_inode);
 	error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name,
 					   new_dir, &new_dentry->d_name);
 	nfs_mark_for_revalidate(old_inode);
-	nfs_end_data_update(old_inode);
-	nfs_end_data_update(new_dir);
-	nfs_end_data_update(old_dir);
 out:
 	if (rehash)
 		d_rehash(rehash);
 	if (!error) {
 		d_move(old_dentry, new_dentry);
-		nfs_renew_times(new_dentry);
-		nfs_refresh_verifier(new_dentry, nfs_save_change_attribute(new_dir));
+		nfs_set_verifier(new_dentry,
+					nfs_save_change_attribute(new_dir));
 	}
 
 	/* new dentry created? */
···
 	return NULL;
 }
 
-int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res)
+static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
 	struct nfs_access_entry *cache;
···
 	cache = nfs_access_search_rbtree(inode, cred);
 	if (cache == NULL)
 		goto out;
-	if (time_after(jiffies, cache->jiffies + NFS_ATTRTIMEO(inode)))
+	if (!time_in_range(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo))
 		goto out_stale;
 	res->jiffies = cache->jiffies;
 	res->cred = cache->cred;
···
 	nfs_access_free_entry(entry);
 }
 
-void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set)
+static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set)
 {
 	struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL);
 	if (cache == NULL)
···
 	if ((cache.mask & mask) == mask)
 		return 0;
 	return -EACCES;
+}
+
+static int nfs_open_permission_mask(int openflags)
+{
+	int mask = 0;
+
+	if (openflags & FMODE_READ)
+		mask |= MAY_READ;
+	if (openflags & FMODE_WRITE)
+		mask |= MAY_WRITE;
+	if (openflags & FMODE_EXEC)
+		mask |= MAY_EXEC;
+	return mask;
+}
+
+int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags)
+{
+	return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags));
 }
 
 int nfs_permission(struct inode *inode, int mask, struct nameidata *nd)

fs/nfs/direct.c

···
 		return -ENOMEM;
 
 	dreq->inode = inode;
-	dreq->ctx = get_nfs_open_context((struct nfs_open_context *)iocb->ki_filp->private_data);
+	dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
 	if (!is_sync_kiocb(iocb))
 		dreq->iocb = iocb;
 
···
 			nfs_direct_write_reschedule(dreq);
 			break;
 		default:
-			nfs_end_data_update(inode);
 			if (dreq->commit_data != NULL)
 				nfs_commit_free(dreq->commit_data);
 			nfs_direct_free_writedata(dreq);
···
 
 static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode *inode)
 {
-	nfs_end_data_update(inode);
 	nfs_direct_free_writedata(dreq);
 	nfs_zap_mapping(inode, inode->i_mapping);
 	nfs_direct_complete(dreq);
···
 		sync = FLUSH_STABLE;
 
 	dreq->inode = inode;
-	dreq->ctx = get_nfs_open_context((struct nfs_open_context *)iocb->ki_filp->private_data);
+	dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
 	if (!is_sync_kiocb(iocb))
 		dreq->iocb = iocb;
 
 	nfs_add_stats(inode, NFSIOS_DIRECTWRITTENBYTES, count);
-
-	nfs_begin_data_update(inode);
 
 	rpc_clnt_sigmask(clnt, &oldset);
 	result = nfs_direct_write_schedule(dreq, user_addr, count, pos, sync);

fs/nfs/file.c

···
 #include <asm/system.h>
 
 #include "delegation.h"
+#include "internal.h"
 #include "iostat.h"
 
 #define NFSDBG_FACILITY		NFSDBG_FILE
···
 static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
 static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
 static int nfs_setlease(struct file *file, long arg, struct file_lock **fl);
+
+static struct vm_operations_struct nfs_file_vm_ops;
 
 const struct file_operations nfs_file_operations = {
 	.llseek		= nfs_file_llseek,
···
 }
 
 /*
+ * Helper for nfs_file_flush() and nfs_fsync()
+ *
+ * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
+ * disk, but it retrieves and clears ctx->error after synching, despite
+ * the two being set at the same time in nfs_context_set_write_error().
+ * This is because the former is used to notify the _next_ call to
+ * nfs_file_write() that a write error occured, and hence cause it to
+ * fall back to doing a synchronous write.
+ */
+static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode)
+{
+	int have_error, status;
+	int ret = 0;
+
+	have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
+	status = nfs_wb_all(inode);
+	have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
+	if (have_error)
+		ret = xchg(&ctx->error, 0);
+	if (!ret)
+		ret = status;
+	return ret;
+}
+
+/*
  * Flush all dirty pages, and check for write errors.
  *
  */
 static int
 nfs_file_flush(struct file *file, fl_owner_t id)
 {
-	struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
+	struct nfs_open_context *ctx = nfs_file_open_context(file);
 	struct inode	*inode = file->f_path.dentry->d_inode;
 	int		status;
 
···
 	if ((file->f_mode & FMODE_WRITE) == 0)
 		return 0;
 	nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
-	lock_kernel();
+
 	/* Ensure that data+attribute caches are up to date after close() */
-	status = nfs_wb_all(inode);
-	if (!status) {
-		status = ctx->error;
-		ctx->error = 0;
-		if (!status)
-			nfs_revalidate_inode(NFS_SERVER(inode), inode);
-	}
-	unlock_kernel();
+	status = nfs_do_fsync(ctx, inode);
+	if (!status)
+		nfs_revalidate_inode(NFS_SERVER(inode), inode);
 	return status;
 }
 
···
 		dentry->d_parent->d_name.name, dentry->d_name.name);
 
 	status = nfs_revalidate_mapping(inode, file->f_mapping);
-	if (!status)
-		status = generic_file_mmap(file, vma);
+	if (!status) {
+		vma->vm_ops = &nfs_file_vm_ops;
+		vma->vm_flags |= VM_CAN_NONLINEAR;
+		file_accessed(file);
+	}
 	return status;
 }
 
···
 static int
 nfs_fsync(struct file *file, struct dentry *dentry, int datasync)
 {
-	struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
+	struct nfs_open_context *ctx = nfs_file_open_context(file);
 	struct inode *inode = dentry->d_inode;
-	int status;
 
 	dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
 
 	nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
-	lock_kernel();
-	status = nfs_wb_all(inode);
-	if (!status) {
-		status = ctx->error;
-		ctx->error = 0;
-	}
-	unlock_kernel();
-	return status;
+	return nfs_do_fsync(ctx, inode);
 }
 
 /*
···
 const struct address_space_operations nfs_file_aops = {
 	.readpage = nfs_readpage,
 	.readpages = nfs_readpages,
-	.set_page_dirty = nfs_set_page_dirty,
+	.set_page_dirty = __set_page_dirty_nobuffers,
 	.writepage = nfs_writepage,
 	.writepages = nfs_writepages,
 	.prepare_write = nfs_prepare_write,
···
 #endif
 	.launder_page = nfs_launder_page,
 };
+
+static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+{
+	struct file *filp = vma->vm_file;
+	unsigned pagelen;
+	int ret = -EINVAL;
+
+	lock_page(page);
+	if (page->mapping != vma->vm_file->f_path.dentry->d_inode->i_mapping)
+		goto out_unlock;
+	pagelen = nfs_page_length(page);
+	if (pagelen == 0)
+		goto out_unlock;
+	ret = nfs_prepare_write(filp, page, 0, pagelen);
+	if (!ret)
+		ret = nfs_commit_write(filp, page, 0, pagelen);
+out_unlock:
+	unlock_page(page);
+	return ret;
+}
+
+static struct vm_operations_struct nfs_file_vm_ops = {
+	.fault = filemap_fault,
+	.page_mkwrite = nfs_vm_page_mkwrite,
+};
+
+static int nfs_need_sync_write(struct file *filp, struct inode *inode)
+{
+	struct nfs_open_context *ctx;
+
+	if (IS_SYNC(inode) || (filp->f_flags & O_SYNC))
+		return 1;
+	ctx = nfs_file_open_context(filp);
+	if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags))
+		return 1;
+	return 0;
+}
 
 static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
 				unsigned long nr_segs, loff_t pos)
···
 	nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count);
 	result = generic_file_aio_write(iocb, iov, nr_segs, pos);
 	/* Return error values for O_SYNC and IS_SYNC() */
-	if (result >= 0 && (IS_SYNC(inode) || (iocb->ki_filp->f_flags & O_SYNC))) {
-		int err = nfs_fsync(iocb->ki_filp, dentry, 1);
+	if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) {
+		int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode);
 		if (err < 0)
 			result = err;
 	}

fs/nfs/inode.c

···
 
 #define NFSDBG_FACILITY		NFSDBG_VFS
 
+#define NFS_64_BIT_INODE_NUMBERS_ENABLED	1
+
+/* Default is to see 64-bit inode numbers */
+static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
+
 static void nfs_invalidate_inode(struct inode *);
 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
 
···
 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
 {
 	return nfs_fileid_to_ino_t(fattr->fileid);
+}
+
+/**
+ * nfs_compat_user_ino64 - returns the user-visible inode number
+ * @fileid: 64-bit fileid
+ *
+ * This function returns a 32-bit inode number if the boot parameter
+ * nfs.enable_ino64 is zero.
+ */
+u64 nfs_compat_user_ino64(u64 fileid)
+{
+	int ino;
+
+	if (enable_ino64)
+		return fileid;
+	ino = fileid;
+	if (sizeof(ino) < sizeof(fileid))
+		ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
+	return ino;
 }
 
 int nfs_write_inode(struct inode *inode, int sync)
···
 	 */
 	BUG_ON(nfs_have_writebacks(inode));
 	BUG_ON(!list_empty(&NFS_I(inode)->open_files));
-	BUG_ON(atomic_read(&NFS_I(inode)->data_updates) != 0);
 	nfs_zap_acl_cache(inode);
 	nfs_access_zap_cache(inode);
 }
···
 
 	nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
 
-	NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
-	NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
+	nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
+	nfsi->attrtimeo_timestamp = jiffies;
 
 	memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
 	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
···
 		clear_acl_cache(inode);
 	spin_lock(&inode->i_lock);
 	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
+	spin_unlock(&inode->i_lock);
+}
+
+void nfs_invalidate_atime(struct inode *inode)
+{
+	spin_lock(&inode->i_lock);
+	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
 	spin_unlock(&inode->i_lock);
 }
 
···
 		return 0;
 
 	lock_kernel();
-	nfs_begin_data_update(inode);
 	/* Write all dirty data */
 	if (S_ISREG(inode->i_mode)) {
 		filemap_write_and_wait(inode->i_mapping);
···
 	error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
 	if (error == 0)
 		nfs_refresh_inode(inode, &fattr);
-	nfs_end_data_update(inode);
 	unlock_kernel();
 	return error;
 }
···
 
 	/* Flush out writes to the server in order to update c/mtime */
 	if (S_ISREG(inode->i_mode))
-		nfs_sync_mapping_range(inode->i_mapping, 0, 0, FLUSH_NOCOMMIT);
+		nfs_wb_nocommit(inode);
 
 	/*
 	 * We may force a getattr if the user cares about atime.
···
 		err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
 	else
 		err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
-	if (!err)
+	if (!err) {
 		generic_fillattr(inode, stat);
+		stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
+	}
 	return err;
 }
 
···
 static void nfs_file_clear_open_context(struct file *filp)
 {
 	struct inode *inode = filp->f_path.dentry->d_inode;
-	struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
+	struct nfs_open_context *ctx = nfs_file_open_context(filp);
 
 	if (ctx) {
 		filp->private_data = NULL;
···
 	status = nfs_wait_on_inode(inode);
 	if (status < 0)
 		goto out;
-	if (NFS_STALE(inode)) {
-		status = -ESTALE;
-		/* Do we trust the cached ESTALE? */
-		if (NFS_ATTRTIMEO(inode) != 0) {
-			if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME)) {
-				/* no */
-			} else
-				goto out;
-		}
-	}
+
+	status = -ESTALE;
+	if (NFS_STALE(inode))
+		goto out;
 
 	status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
 	if (status != 0) {
···
 
 	if (nfs_have_delegation(inode, FMODE_READ))
 		return 0;
-	return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
+	return !time_in_range(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
 }
 
 /**
···
 	}
 	spin_lock(&inode->i_lock);
 	nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
-	if (S_ISDIR(inode->i_mode)) {
+	if (S_ISDIR(inode->i_mode))
 		memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
-		/* This ensures we revalidate child dentries */
-		nfsi->cache_change_attribute = jiffies;
-	}
 	spin_unlock(&inode->i_lock);
 	nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
 	dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
···
 	return ret;
 }
 
-/**
- * nfs_begin_data_update
- * @inode - pointer to inode
- * Declare that a set of operations will update file data on the server
- */
-void nfs_begin_data_update(struct inode *inode)
-{
-	atomic_inc(&NFS_I(inode)->data_updates);
-}
-
-/**
- * nfs_end_data_update
- * @inode - pointer to inode
- * Declare end of the operations that will update file data
- * This will mark the inode as immediately needing revalidation
- * of its attribute cache.
- */
-void nfs_end_data_update(struct inode *inode)
-{
-	struct nfs_inode *nfsi = NFS_I(inode);
-
-	/* Directories: invalidate page cache */
-	if (S_ISDIR(inode->i_mode)) {
-		spin_lock(&inode->i_lock);
-		nfsi->cache_validity |= NFS_INO_INVALID_DATA;
-		spin_unlock(&inode->i_lock);
-	}
-	nfsi->cache_change_attribute = jiffies;
-	atomic_dec(&nfsi->data_updates);
-}
-
 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
-	unsigned long now = jiffies;
 
+	if ((fattr->valid & NFS_ATTR_WCC_V4) != 0 &&
+			nfsi->change_attr == fattr->pre_change_attr) {
+		nfsi->change_attr = fattr->change_attr;
+		if (S_ISDIR(inode->i_mode))
+			nfsi->cache_validity |= NFS_INO_INVALID_DATA;
+	}
 	/* If we have atomic WCC data, we may update some attributes */
 	if ((fattr->valid & NFS_ATTR_WCC) != 0) {
-		if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
+		if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
 			memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
-			nfsi->cache_change_attribute = now;
-		}
 		if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
 			memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
-			nfsi->cache_change_attribute = now;
+			if (S_ISDIR(inode->i_mode))
+				nfsi->cache_validity |= NFS_INO_INVALID_DATA;
 		}
-		if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
+		if (inode->i_size == fattr->pre_size && nfsi->npages == 0)
 			inode->i_size = fattr->size;
-			nfsi->cache_change_attribute = now;
-		}
 	}
 }
 
···
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
 	loff_t cur_size, new_isize;
-	int data_unstable;
+	unsigned long invalid = 0;
 
 
 	/* Has the inode gone and changed behind our back? */
···
 		return -EIO;
 	}
 
-	/* Are we in the process of updating data on the server? */
-	data_unstable = nfs_caches_unstable(inode);
-
 	/* Do atomic weak cache consistency updates */
 	nfs_wcc_update_inode(inode, fattr);
 
 	if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
 			nfsi->change_attr != fattr->change_attr)
-		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
+		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
 
 	/* Verify a few of the more important attributes */
 	if (!timespec_equal(&inode->i_mtime, &fattr->mtime))
-		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
+		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
 
 	cur_size = i_size_read(inode);
  	new_isize = nfs_size_to_loff_t(fattr->size);
 	if (cur_size != new_isize && nfsi->npages == 0)
-		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
+		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
 
 	/* Have any file permissions changed? */
 	if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
 			|| inode->i_uid != fattr->uid
 			|| inode->i_gid != fattr->gid)
-		nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
+		invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
 
 	/* Has the link count changed? */
 	if (inode->i_nlink != fattr->nlink)
-		nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
+		invalid |= NFS_INO_INVALID_ATTR;
 
 	if (!timespec_equal(&inode->i_atime, &fattr->atime))
-		nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
+		invalid |= NFS_INO_INVALID_ATIME;
+
+	if (invalid != 0)
+		nfsi->cache_validity |= invalid;
+	else
+		nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
+				| NFS_INO_INVALID_ATIME
+				| NFS_INO_REVAL_PAGECACHE);
 
 	nfsi->read_cache_jiffies = fattr->time_start;
 	return 0;
···
 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
-	int status = 0;
 
 	spin_lock(&inode->i_lock);
-	if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
-		nfsi->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
-		goto out;
-	}
-	status = nfs_update_inode(inode, fattr);
-out:
+	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
+	if (S_ISDIR(inode->i_mode))
+		nfsi->cache_validity |= NFS_INO_INVALID_DATA;
 	spin_unlock(&inode->i_lock);
-	return status;
+	return nfs_refresh_inode(inode, fattr);
+}
+
+/**
+ * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
+ * @inode - pointer to inode
+ * @fattr - updated attributes
+ *
+ * After an operation that has changed the inode metadata, mark the
+ * attribute cache as being invalid, then try to update it. Fake up
+ * weak cache consistency data, if none exist.
+ *
+ * This function is mainly designed to be used by the ->write_done() functions.
+ */
+int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
+{
+	if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
+			(fattr->valid & NFS_ATTR_WCC_V4) == 0) {
+		fattr->pre_change_attr = NFS_I(inode)->change_attr;
+		fattr->valid |= NFS_ATTR_WCC_V4;
+	}
+	if ((fattr->valid & NFS_ATTR_FATTR) != 0 &&
+			(fattr->valid & NFS_ATTR_WCC) == 0) {
+		memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
+		memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
+		fattr->pre_size = inode->i_size;
+		fattr->valid |= NFS_ATTR_WCC;
+	}
+	return nfs_post_op_update_inode(inode, fattr);
 }
 
 /*
···
 	struct nfs_server *server;
 	struct nfs_inode *nfsi = NFS_I(inode);
 	loff_t cur_isize, new_isize;
-	unsigned int	invalid = 0;
+	unsigned long invalid = 0;
 	unsigned long now = jiffies;
-	int data_stable;
 
 	dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
 			__FUNCTION__, inode->i_sb->s_id, inode->i_ino,
···
 	 * Update the read time so we don't revalidate too often.
 	 */
 	nfsi->read_cache_jiffies = fattr->time_start;
-	nfsi->last_updated = now;
 
-	/* Fix a wraparound issue with nfsi->cache_change_attribute */
-	if (time_before(now, nfsi->cache_change_attribute))
-		nfsi->cache_change_attribute = now - 600*HZ;
-
-	/* Are we racing with known updates of the metadata on the server? */
-	data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
-	if (data_stable)
-		nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATIME);
+	nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ATIME
+			| NFS_INO_REVAL_PAGECACHE);
 
 	/* Do atomic weak cache consistency updates */
 	nfs_wcc_update_inode(inode, fattr);
+
+	/* More cache consistency checks */
+	if (!(fattr->valid & NFS_ATTR_FATTR_V4)) {
+		/* NFSv2/v3: Check if the mtime agrees */
+		if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
+			dprintk("NFS: mtime change on server for file %s/%ld\n",
+					inode->i_sb->s_id, inode->i_ino);
+			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
+			nfsi->cache_change_attribute = now;
+		}
+		/* If ctime has changed we should definitely clear access+acl caches */
+		if (!timespec_equal(&inode->i_ctime, &fattr->ctime))
+			invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+	} else if (nfsi->change_attr != fattr->change_attr) {
+		dprintk("NFS: change_attr change on server for file %s/%ld\n",
+				inode->i_sb->s_id, inode->i_ino);
+		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+		nfsi->cache_change_attribute = now;
+	}
 
 	/* Check if our cached file size is stale */
  	new_isize = nfs_size_to_loff_t(fattr->size);
 	cur_isize = i_size_read(inode);
 	if (new_isize != cur_isize) {
-		/* Do we perhaps have any outstanding writes? */
-		if (nfsi->npages == 0) {
-			/* No, but did we race with nfs_end_data_update()? */
-			if (data_stable) {
-				inode->i_size = new_isize;
-				invalid |= NFS_INO_INVALID_DATA;
-			}
-			invalid |= NFS_INO_INVALID_ATTR;
-		} else if (new_isize > cur_isize) {
+		/* Do we perhaps have any outstanding writes, or has
+		 * the file grown beyond our last write? */
+		if (nfsi->npages == 0 || new_isize > cur_isize) {
 			inode->i_size = new_isize;
 			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 		}
-		nfsi->cache_change_attribute = now;
 		dprintk("NFS: isize change on server for file %s/%ld\n",
 				inode->i_sb->s_id, inode->i_ino);
 	}
 
-	/* Check if the mtime agrees */
-	if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
-		memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
-		dprintk("NFS: mtime change on server for file %s/%ld\n",
-				inode->i_sb->s_id, inode->i_ino);
-		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
-		nfsi->cache_change_attribute = now;
-	}
 
-	/* If ctime has changed we should definitely clear access+acl caches */
-	if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
-		invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
-		memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
-		nfsi->cache_change_attribute = now;
-	}
+	memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
+	memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
 	memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
+	nfsi->change_attr = fattr->change_attr;
 
 	if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
 	    inode->i_uid != fattr->uid ||
···
  		inode->i_blocks = fattr->du.nfs2.blocks;
  	}
 
-	if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
-			nfsi->change_attr != fattr->change_attr) {
-		dprintk("NFS: change_attr change on server for file %s/%ld\n",
-				inode->i_sb->s_id, inode->i_ino);
-		nfsi->change_attr = fattr->change_attr;
-		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
-		nfsi->cache_change_attribute = now;
-	}
-
 	/* Update attrtimeo value if we're out of the unstable period */
 	if (invalid & NFS_INO_INVALID_ATTR) {
 		nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
 		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
 		nfsi->attrtimeo_timestamp = now;
-	} else if (time_after(now, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
-		if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
-			nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
-		nfsi->attrtimeo_timestamp = now;
+		nfsi->last_updated = now;
+	} else {
+		if (!time_in_range(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
+			if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
+				nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
+			nfsi->attrtimeo_timestamp = now;
+		}
+		/*
+		 * Avoid jiffy wraparound issues with nfsi->last_updated
+		 */
+		if (!time_in_range(nfsi->last_updated, nfsi->read_cache_jiffies, now))
+			nfsi->last_updated = nfsi->read_cache_jiffies;
 	}
+	invalid &= ~NFS_INO_INVALID_ATTR;
 	/* Don't invalidate the data if we were to blame */
 	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
 				|| S_ISLNK(inode->i_mode)))
 		invalid &= ~NFS_INO_INVALID_DATA;
-	if (data_stable)
-		invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
 	if (!nfs_have_delegation(inode, FMODE_READ) ||
 			(nfsi->cache_validity & NFS_INO_REVAL_FORCED))
 		nfsi->cache_validity |= invalid;
···
 	INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
 	INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
 	INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
-	atomic_set(&nfsi->data_updates, 0);
 	nfsi->ncommit = 0;
 	nfsi->npages = 0;
 	nfs4_init_once(nfsi);
···
 /* Not quite true; I just maintain it */
 MODULE_AUTHOR("Olaf Kirch <[e-mail]>");
 MODULE_LICENSE("GPL");
+module_param(enable_ino64, bool, 0644);
 
 module_init(init_nfs_fs)
 module_exit(exit_nfs_fs)

fs/nfs/internal.h

···
 #include <linux/mount.h>
 
 struct nfs_string;
-struct nfs_mount_data;
-struct nfs4_mount_data;
 
 /* Maximum number of readahead requests
  * FIXME: this should really be a sysctl so that users may tune it to suit
···
 	rpc_authflavor_t authflavor;
 };
 
+/*
+ * In-kernel mount arguments
+ */
+struct nfs_parsed_mount_data {
+	int			flags;
+	int			rsize, wsize;
+	int			timeo, retrans;
+	int			acregmin, acregmax,
+				acdirmin, acdirmax;
+	int			namlen;
+	unsigned int		bsize;
+	unsigned int		auth_flavor_len;
+	rpc_authflavor_t	auth_flavors[1];
+	char			*client_address;
+
+	struct {
+		struct sockaddr_in	address;
+		char			*hostname;
+		unsigned int		program;
+		unsigned int		version;
+		unsigned short		port;
+		int			protocol;
+	} mount_server;
+
+	struct {
+		struct sockaddr_in	address;
+		char			*hostname;
+		char			*export_path;
+		unsigned int		program;
+		int			protocol;
+	} nfs_server;
+};
+
 /* client.c */
 extern struct rpc_program nfs_program;
 
 extern void nfs_put_client(struct nfs_client *);
 extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int);
-extern struct nfs_server *nfs_create_server(const struct nfs_mount_data *,
-					    struct nfs_fh *);
-extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *,
-					     const char *,
-					     const struct sockaddr_in *,
-					     const char *,
-					     const char *,
-					     rpc_authflavor_t,
-					     struct nfs_fh *);
+extern struct nfs_server *nfs_create_server(
+					const struct nfs_parsed_mount_data *,
+					struct nfs_fh *);
+extern struct nfs_server *nfs4_create_server(
+					const struct nfs_parsed_mount_data *,
+					struct nfs_fh *);
 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 						      struct nfs_fh *);
 extern void nfs_free_server(struct nfs_server *server);

fs/nfs/nfs2xdr.c

···
 	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readres_sz) << 2;
 	xdr_inline_pages(&req->rq_rcv_buf, replen,
 			 args->pages, args->pgbase, count);
+	req->rq_rcv_buf.flags |= XDRBUF_READ;
 	return 0;
 }
 
···
 	res->eof = 0;
 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
 	if (iov->iov_len < hdrlen) {
-		printk(KERN_WARNING "NFS: READ reply header overflowed:"
+		dprintk("NFS: READ reply header overflowed:"
 				"length %d > %Zu\n", hdrlen, iov->iov_len);
 		return -errno_NFSERR_IO;
 	} else if (iov->iov_len != hdrlen) {
···
 
 	recvd = req->rq_rcv_buf.len - hdrlen;
 	if (count > recvd) {
-		printk(KERN_WARNING "NFS: server cheating in read reply: "
+		dprintk("NFS: server cheating in read reply: "
 			"count %d > recvd %d\n", count, recvd);
 		count = recvd;
 	}
···
 
 	/* Copy the page array */
 	xdr_encode_pages(sndbuf, args->pages, args->pgbase, count);
+	sndbuf->flags |= XDRBUF_WRITE;
 	return 0;
 }
 
···
 
 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
 	if (iov->iov_len < hdrlen) {
-		printk(KERN_WARNING "NFS: READDIR reply header overflowed:"
+		dprintk("NFS: READDIR reply header overflowed:"
 				"length %d > %Zu\n", hdrlen, iov->iov_len);
 		return -errno_NFSERR_IO;
 	} else if (iov->iov_len != hdrlen) {
···
 		len = ntohl(*p++);
 		p += XDR_QUADLEN(len) + 1;	/* name plus cookie */
 		if (len > NFS2_MAXNAMLEN) {
-			printk(KERN_WARNING "NFS: giant filename in readdir (len 0x%x)!\n",
+			dprintk("NFS: giant filename in readdir (len 0x%x)!\n",
 						len);
 			goto err_unmap;
 		}
···
 	entry[0] = entry[1] = 0;
 	/* truncate listing ? */
 	if (!nr) {
-		printk(KERN_NOTICE "NFS: readdir reply truncated!\n");
+		dprintk("NFS: readdir reply truncated!\n");
 		entry[1] = 1;
 	}
 	goto out;
···
 	/* Convert length of symlink */
 	len = ntohl(*p++);
 	if (len >= rcvbuf->page_len || len <= 0) {
-		dprintk(KERN_WARNING "nfs: server returned giant symlink!\n");
+		dprintk("nfs: server returned giant symlink!\n");
 		return -ENAMETOOLONG;
 	}
 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
 	if (iov->iov_len < hdrlen) {
-		printk(KERN_WARNING "NFS: READLINK reply header overflowed:"
+		dprintk("NFS: READLINK reply header overflowed:"
 				"length %d > %Zu\n", hdrlen, iov->iov_len);
 		return -errno_NFSERR_IO;
 	} else if (iov->iov_len != hdrlen) {
···
 	}
 	recvd = req->rq_rcv_buf.len - hdrlen;
 	if (recvd < len) {
-		printk(KERN_WARNING "NFS: server cheating in readlink reply: "
+		dprintk("NFS: server cheating in readlink reply: "
 				"count %u > recvd %u\n", len, recvd);
 		return -EIO;
 	}
···
 		if (nfs_errtbl[i].stat == stat)
 			return nfs_errtbl[i].errno;
 	}
-	printk(KERN_ERR "nfs_stat_to_errno: bad nfs status return value: %d\n", stat);
+	dprintk("nfs_stat_to_errno: bad nfs status return value: %d\n", stat);
 	return nfs_errtbl[i].errno;
 }
 

fs/nfs/nfs3acl.c

···
 	}
 
 	dprintk("NFS call setacl\n");
-	nfs_begin_data_update(inode);
 	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
 	status = rpc_call_sync(server->client_acl, &msg, 0);
 	spin_lock(&inode->i_lock);
 	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS;
 	spin_unlock(&inode->i_lock);
-	nfs_end_data_update(inode);
 	dprintk("NFS reply setacl: %d\n", status);
 
 	/* pages may have been allocated at the xdr layer. */

fs/nfs/nfs3proc.c

···
 	nfs_fattr_init(&dir_attr);
 	nfs_fattr_init(fattr);
 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+	nfs_refresh_inode(dir, &dir_attr);
 	if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
 		msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
 		msg.rpc_argp = fhandle;
···
 		status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 	}
 	dprintk("NFS reply lookup: %d\n", status);
-	if (status >= 0)
-		status = nfs_refresh_inode(dir, &dir_attr);
 	return status;
 }
 
···
 
 	nfs_fattr_init(&dir_attr);
 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+
+	nfs_invalidate_atime(dir);
+
 	nfs_refresh_inode(dir, &dir_attr);
 	dprintk("NFS reply readdir: %d\n", status);
 	return status;
···
 {
 	if (nfs3_async_handle_jukebox(task, data->inode))
 		return -EAGAIN;
-	/* Call back common NFS readpage processing */
-	if (task->tk_status >= 0)
-		nfs_refresh_inode(data->inode, &data->fattr);
+
+	nfs_invalidate_atime(data->inode);
+	nfs_refresh_inode(data->inode, &data->fattr);
 	return 0;
 }
 
···
 	if (nfs3_async_handle_jukebox(task, data->inode))
 		return -EAGAIN;
 	if (task->tk_status >= 0)
-		nfs_post_op_update_inode(data->inode, data->res.fattr);
+		nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
 	return 0;
 }
 
···
 {
 	if (nfs3_async_handle_jukebox(task, data->inode))
 		return -EAGAIN;
-	if (task->tk_status >= 0)
-		nfs_post_op_update_inode(data->inode, data->res.fattr);
+	nfs_refresh_inode(data->inode, data->res.fattr);
 	return 0;
 }
 

fs/nfs/nfs3xdr.c

···
 	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readres_sz) << 2;
 	xdr_inline_pages(&req->rq_rcv_buf, replen,
 			 args->pages, args->pgbase, count);
+	req->rq_rcv_buf.flags |= XDRBUF_READ;
 	return 0;
 }
 
···
 
 	/* Copy the page array */
 	xdr_encode_pages(sndbuf, args->pages, args->pgbase, count);
+	sndbuf->flags |= XDRBUF_WRITE;
 	return 0;
 }
 
···
 
 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
 	if (iov->iov_len < hdrlen) {
-		printk(KERN_WARNING "NFS: READDIR reply header overflowed:"
+		dprintk("NFS: READDIR reply header overflowed:"
 				"length %d > %Zu\n", hdrlen, iov->iov_len);
 		return -errno_NFSERR_IO;
 	} else if (iov->iov_len != hdrlen) {
···
 		len = ntohl(*p++);		/* string length */
 		p += XDR_QUADLEN(len) + 2;	/* name + cookie */
 		if (len > NFS3_MAXNAMLEN) {
-			printk(KERN_WARNING "NFS: giant filename in readdir (len %x)!\n",
+			dprintk("NFS: giant filename in readdir (len %x)!\n",
 						len);
 			goto err_unmap;
 		}
···
 					goto short_pkt;
 				len = ntohl(*p++);
 				if (len > NFS3_FHSIZE) {
-					printk(KERN_WARNING "NFS: giant filehandle in "
+					dprintk("NFS: giant filehandle in "
 						"readdir (len %x)!\n", len);
 					goto err_unmap;
 				}
···
 	entry[0] = entry[1] = 0;
 	/* truncate listing ? */
 	if (!nr) {
-		printk(KERN_NOTICE "NFS: readdir reply truncated!\n");
+		dprintk("NFS: readdir reply truncated!\n");
 		entry[1] = 1;
 	}
 	goto out;
···
 	/* Convert length of symlink */
 	len = ntohl(*p++);
 	if (len >= rcvbuf->page_len || len <= 0) {
-		dprintk(KERN_WARNING "nfs: server returned giant symlink!\n");
+		dprintk("nfs: server returned giant symlink!\n");
 		return -ENAMETOOLONG;
 	}
 
 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
 	if (iov->iov_len < hdrlen) {
-		printk(KERN_WARNING "NFS: READLINK reply header overflowed:"
+		dprintk("NFS: READLINK reply header overflowed:"
 				"length %d > %Zu\n", hdrlen, iov->iov_len);
 		return -errno_NFSERR_IO;
 	} else if (iov->iov_len != hdrlen) {
-		dprintk("NFS: READLINK header is short. iovec will be shifted.\n");
+		dprintk("NFS: READLINK header is short. "
+			"iovec will be shifted.\n");
 		xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
 	}
 	recvd = req->rq_rcv_buf.len - hdrlen;
 	if (recvd < len) {
-		printk(KERN_WARNING "NFS: server cheating in readlink reply: "
+		dprintk("NFS: server cheating in readlink reply: "
 				"count %u > recvd %u\n", len, recvd);
 		return -EIO;
 	}
···
 	ocount   = ntohl(*p++);
 
 	if (ocount != count) {
-		printk(KERN_WARNING "NFS: READ count doesn't match RPC opaque count.\n");
+		dprintk("NFS: READ count doesn't match RPC opaque count.\n");
 		return -errno_NFSERR_IO;
 	}
 
 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
 	if (iov->iov_len < hdrlen) {
-		printk(KERN_WARNING "NFS: READ reply header overflowed:"
+		dprintk("NFS: READ reply header overflowed:"
 				"length %d > %Zu\n", hdrlen, iov->iov_len);
        		return -errno_NFSERR_IO;
 	} else if (iov->iov_len != hdrlen) {
···
 
 	recvd = req->rq_rcv_buf.len - hdrlen;
 	if (count > recvd) {
-		printk(KERN_WARNING "NFS: server cheating in read reply: "
+		dprintk("NFS: server cheating in read reply: "
 			"count %d > recvd %d\n", count, recvd);
 		count = recvd;
 		res->eof = 0;

fs/nfs/nfs4proc.c

···
 static int _nfs4_proc_open(struct nfs4_opendata *data);
 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
-static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
-static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags);
 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
 
···
 		*p++ = xdr_one;                         /* bitmap length */
 		*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 		*p++ = htonl(8);              /* attribute buffer length */
-		p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
+		p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 	}
 	
 	*p++ = xdr_one;                                  /* next */
···
 	*p++ = xdr_one;                         /* bitmap length */
 	*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 	*p++ = htonl(8);              /* attribute buffer length */
-	p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
+	p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 
 	readdir->pgbase = (char *)p - (char *)start;
 	readdir->count -= readdir->pgbase;
···
 
 	spin_lock(&dir->i_lock);
 	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
-	if (cinfo->before == nfsi->change_attr && cinfo->atomic)
-		nfsi->change_attr = cinfo->after;
+	if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
+		nfsi->cache_change_attribute = jiffies;
+	nfsi->change_attr = cinfo->after;
 	spin_unlock(&dir->i_lock);
 }
 
···
 		memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 		rcu_read_unlock();
 		lock_kernel();
-		ret = _nfs4_do_access(state->inode, state->owner->so_cred, open_mode);
+		ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 		unlock_kernel();
 		if (ret != 0)
 			goto out;
···
 	return 0;
 }
 
-static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
-{
-	struct nfs_access_entry cache;
-	int mask = 0;
-	int status;
-
-	if (openflags & FMODE_READ)
-		mask |= MAY_READ;
-	if (openflags & FMODE_WRITE)
-		mask |= MAY_WRITE;
-	if (openflags & FMODE_EXEC)
-		mask |= MAY_EXEC;
-	status = nfs_access_get_cached(inode, cred, &cache);
-	if (status == 0)
-		goto out;
-
-	/* Be clever: ask server to check for all possible rights */
-	cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
-	cache.cred = cred;
-	cache.jiffies = jiffies;
-	status = _nfs4_proc_access(inode, &cache);
-	if (status != 0)
-		return status;
-	nfs_access_add_cache(inode, &cache);
-out:
-	if ((cache.mask & mask) == mask)
-		return 0;
-	return -EACCES;
-}
-
 static int nfs4_recover_expired_lease(struct nfs_server *server)
 {
 	struct nfs_client *clp = server->nfs_client;
···
 
 	/* If the open_intent is for execute, we have an extra check to make */
 	if (nd->intent.open.flags & FMODE_EXEC) {
-		ret = _nfs4_do_access(state->inode,
+		ret = nfs_may_open(state->inode,
 				state->owner->so_cred,
 				nd->intent.open.flags);
 		if (ret < 0)
···
 	filp = lookup_instantiate_filp(nd, path->dentry, NULL);
 	if (!IS_ERR(filp)) {
 		struct nfs_open_context *ctx;
-		ctx = (struct nfs_open_context *)filp->private_data;
+		ctx = nfs_file_open_context(filp);
 		ctx->state = state;
 		return 0;
 	}
···
 	state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
 	put_rpccred(cred);
 	if (IS_ERR(state)) {
-		if (PTR_ERR(state) == -ENOENT)
+		if (PTR_ERR(state) == -ENOENT) {
 			d_add(dentry, NULL);
+			nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
+		}
 		return (struct dentry *)state;
 	}
 	res = d_add_unique(dentry, igrab(state->inode));
 	if (res != NULL)
 		path.dentry = res;
+	nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
 	nfs4_intent_set_file(nd, &path, state);
 	return res;
 }
···
 		}
 	}
 	if (state->inode == dentry->d_inode) {
+		nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 		nfs4_intent_set_file(nd, &path, state);
 		return 1;
 	}
···
 
 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
 {
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs_fattr fattr;
 	struct nfs4_accessargs args = {
 		.fh = NFS_FH(inode),
+		.bitmask = server->attr_bitmask,
 	};
-	struct nfs4_accessres res = { 0 };
+	struct nfs4_accessres res = {
+		.server = server,
+		.fattr = &fattr,
+	};
 	struct rpc_message msg = {
 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
 		.rpc_argp = &args,
···
 		if (mode & MAY_EXEC)
 			args.access |= NFS4_ACCESS_EXECUTE;
 	}
+	nfs_fattr_init(&fattr);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 	if (!status) {
 		entry->mask = 0;
···
 			entry->mask |= MAY_WRITE;
 		if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
 			entry->mask |= MAY_EXEC;
+		nfs_refresh_inode(inode, &fattr);
 	}
 	return status;
 }
···
 	}
 	state = nfs4_do_open(dir, &path, flags, sattr, cred);
 	put_rpccred(cred);
+	d_drop(dentry);
 	if (IS_ERR(state)) {
 		status = PTR_ERR(state);
 		goto out;
 	}
-	d_instantiate(dentry, igrab(state->inode));
+	d_add(dentry, igrab(state->inode));
+	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 	if (flags & O_EXCL) {
 		struct nfs_fattr fattr;
 		status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
···
 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 	if (status == 0)
 		memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
+
+	nfs_invalidate_atime(dir);
+
 	dprintk("%s: returns %d\n", __FUNCTION__, status);
 	return status;
 }
···
 		rpc_restart_call(task);
 		return -EAGAIN;
 	}
+
+	nfs_invalidate_atime(data->inode);
 	if (task->tk_status > 0)
 		renew_lease(server, data->timestamp);
 	return 0;
···
 	}
 	if (task->tk_status >= 0) {
 		renew_lease(NFS_SERVER(inode), data->timestamp);
-		nfs_post_op_update_inode(inode, data->res.fattr);
+		nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
 	}
 	return 0;
 }
···
 		rpc_restart_call(task);
 		return -EAGAIN;
 	}
-	if (task->tk_status >= 0)
-		nfs_post_op_update_inode(inode, data->res.fattr);
+	nfs_refresh_inode(inode, data->res.fattr);
 	return 0;
 }
 
···
 	if (status == 0) {
 		status = data->rpc_status;
 		if (status == 0)
-			nfs_post_op_update_inode(inode, &data->fattr);
+			nfs_refresh_inode(inode, &data->fattr);
 	}
 	rpc_put_task(task);
 	return status;
···
 	status = -ENOMEM;
 	if (seqid == NULL)
 		goto out;
-	task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
+	task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
 	status = PTR_ERR(task);
 	if (IS_ERR(task))
 		goto out;
···
 	int ret;
 
 	dprintk("%s: begin!\n", __FUNCTION__);
-	data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
+	data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
 			fl->fl_u.nfs4_fl.owner);
 	if (data == NULL)
 		return -ENOMEM;
···
 	int status;
 
 	/* verify open state */
-	ctx = (struct nfs_open_context *)filp->private_data;
+	ctx = nfs_file_open_context(filp);
 	state = ctx->state;
 
 	if (request->fl_start < 0 || request->fl_end < 0)

fs/nfs/nfs4state.c

···
 	for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
 		if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
 			continue;
-		if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state)
+		if (nfs_file_open_context(fl->fl_file)->state != state)
 			continue;
 		status = ops->recover_lock(state, fl);
 		if (status >= 0)

fs/nfs/nfs4xdr.c

···
 				decode_locku_maxsz)
 #define NFS4_enc_access_sz	(compound_encode_hdr_maxsz + \
 				encode_putfh_maxsz + \
-				encode_access_maxsz)
+				encode_access_maxsz + \
+				encode_getattr_maxsz)
 #define NFS4_dec_access_sz	(compound_decode_hdr_maxsz + \
 				decode_putfh_maxsz + \
-				decode_access_maxsz)
+				decode_access_maxsz + \
+				decode_getattr_maxsz)
 #define NFS4_enc_getattr_sz	(compound_encode_hdr_maxsz + \
 				encode_putfh_maxsz + \
 				encode_getattr_maxsz)
···
 
 #define RESERVE_SPACE(nbytes)	do {				\
 	p = xdr_reserve_space(xdr, nbytes);			\
-	if (!p) printk("RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __FUNCTION__); \
 	BUG_ON(!p);						\
 } while (0)
 
···
 	if (iap->ia_valid & ATTR_UID) {
 		owner_namelen = nfs_map_uid_to_name(server->nfs_client, iap->ia_uid, owner_name);
 		if (owner_namelen < 0) {
-			printk(KERN_WARNING "nfs: couldn't resolve uid %d to string\n",
-			       iap->ia_uid);
+			dprintk("nfs: couldn't resolve uid %d to string\n",
+					iap->ia_uid);
 			/* XXX */
 			strcpy(owner_name, "nobody");
 			owner_namelen = sizeof("nobody") - 1;
···
 	if (iap->ia_valid & ATTR_GID) {
 		owner_grouplen = nfs_map_gid_to_group(server->nfs_client, iap->ia_gid, owner_group);
 		if (owner_grouplen < 0) {
-			printk(KERN_WARNING "nfs4: couldn't resolve gid %d to string\n",
-			       iap->ia_gid);
+			dprintk("nfs: couldn't resolve gid %d to string\n",
+					iap->ia_gid);
 			strcpy(owner_group, "nobody");
 			owner_grouplen = sizeof("nobody") - 1;
 			/* goto out; */
···
 	 * Now we backfill the bitmap and the attribute buffer length.
 	 */
 	if (len != ((char *)p - (char *)q) + 4) {
-		printk ("encode_attr: Attr length calculation error! %u != %Zu\n",
+		printk(KERN_ERR "nfs: Attr length error, %u != %Zu\n",
 				len, ((char *)p - (char *)q) + 4);
 		BUG();
 	}
···
 {
 	struct xdr_stream xdr;
 	struct compound_hdr hdr = {
-		.nops = 2,
+		.nops = 3,
 	};
 	int status;
 
 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
 	encode_compound_hdr(&xdr, &hdr);
-	if ((status = encode_putfh(&xdr, args->fh)) == 0)
-		status = encode_access(&xdr, args->access);
+	status = encode_putfh(&xdr, args->fh);
+	if (status != 0)
+		goto out;
+	status = encode_access(&xdr, args->access);
+	if (status != 0)
+		goto out;
+	status = encode_getfattr(&xdr, args->bitmask);
+out:
 	return status;
 }
 
···
 	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS4_dec_read_sz) << 2;
 	xdr_inline_pages(&req->rq_rcv_buf, replen,
 			 args->pages, args->pgbase, args->count);
+	req->rq_rcv_buf.flags |= XDRBUF_READ;
 out:
 	return status;
 }
···
 	status = encode_write(&xdr, args);
 	if (status)
 		goto out;
+	req->rq_snd_buf.flags |= XDRBUF_WRITE;
 	status = encode_getfattr(&xdr, args->bitmask);
 out:
 	return status;
···
 #define READ_BUF(nbytes)  do { \
 	p = xdr_inline_decode(xdr, nbytes); \
 	if (unlikely(!p)) { \
-		printk(KERN_INFO "%s: prematurely hit end of receive" \
+		dprintk("nfs: %s: prematurely hit end of receive" \
 				" buffer\n", __FUNCTION__); \
-		printk(KERN_INFO "%s: xdr->p=%p, bytes=%u, xdr->end=%p\n", \
+		dprintk("nfs: %s: xdr->p=%p, bytes=%u, xdr->end=%p\n", \
 				__FUNCTION__, xdr->p, nbytes, xdr->end); \
 		return -EIO; \
 	} \
···
 	READ_BUF(8);
 	READ32(opnum);
 	if (opnum != expected) {
-		printk(KERN_NOTICE
-				"nfs4_decode_op_hdr: Server returned operation"
-			       	" %d but we issued a request for %d\n",
+		dprintk("nfs: Server returned operation"
+			" %d but we issued a request for %d\n",
 				opnum, expected);
 		return -EIO;
 	}
···
 				dprintk("%s: nfs_map_name_to_uid failed!\n",
 						__FUNCTION__);
 		} else
-			printk(KERN_WARNING "%s: name too long (%u)!\n",
+			dprintk("%s: name too long (%u)!\n",
 					__FUNCTION__, len);
 		bitmap[1] &= ~FATTR4_WORD1_OWNER;
 	}
···
 				dprintk("%s: nfs_map_group_to_gid failed!\n",
 						__FUNCTION__);
 		} else
-			printk(KERN_WARNING "%s: name too long (%u)!\n",
+			dprintk("%s: name too long (%u)!\n",
 					__FUNCTION__, len);
 		bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
 	}
···
 	unsigned int nwords = xdr->p - savep;
 
 	if (unlikely(attrwords != nwords)) {
-		printk(KERN_WARNING "%s: server returned incorrect attribute length: %u %c %u\n",
+		dprintk("%s: server returned incorrect attribute length: "
+			"%u %c %u\n",
 				__FUNCTION__,
 				attrwords << 2,
 				(attrwords < nwords) ? '<' : '>',
···
 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
 	recvd = req->rq_rcv_buf.len - hdrlen;
 	if (count > recvd) {
-		printk(KERN_WARNING "NFS: server cheating in read reply: "
+		dprintk("NFS: server cheating in read reply: "
 				"count %u > recvd %u\n", count, recvd);
 		count = recvd;
 		eof = 0;
···
 		p += 2;			/* cookie */
 		len = ntohl(*p++);	/* filename length */
 		if (len > NFS4_MAXNAMLEN) {
-			printk(KERN_WARNING "NFS: giant filename in readdir (len 0x%x)\n", len);
+			dprintk("NFS: giant filename in readdir (len 0x%x)\n",
+					len);
 			goto err_unmap;
 		}
 		xlen = XDR_QUADLEN(len);
···
 	entry[0] = entry[1] = 0;
 	/* truncate listing ? */
 	if (!nr) {
-		printk(KERN_NOTICE "NFS: readdir reply truncated!\n");
+		dprintk("NFS: readdir reply truncated!\n");
 		entry[1] = 1;
 	}
 	goto out;
···
 	READ_BUF(4);
 	READ32(len);
 	if (len >= rcvbuf->page_len || len <= 0) {
-		dprintk(KERN_WARNING "nfs: server returned giant symlink!\n");
+		dprintk("nfs: server returned giant symlink!\n");
 		return -ENAMETOOLONG;
 	}
 	hdrlen = (char *) xdr->p - (char *) iov->iov_base;
 	recvd = req->rq_rcv_buf.len - hdrlen;
 	if (recvd < len) {
-		printk(KERN_WARNING "NFS: server cheating in readlink reply: "
+		dprintk("NFS: server cheating in readlink reply: "
 				"count %u > recvd %u\n", len, recvd);
 		return -EIO;
 	}
···
 		hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
 		recvd = req->rq_rcv_buf.len - hdrlen;
 		if (attrlen > recvd) {
-			printk(KERN_WARNING "NFS: server cheating in getattr"
+			dprintk("NFS: server cheating in getattr"
 					" acl reply: attrlen %u > recvd %u\n",
 					attrlen, recvd);
 			return -EINVAL;
···
 	READ_BUF(8);
 	READ32(opnum);
 	if (opnum != OP_SETCLIENTID) {
-		printk(KERN_NOTICE
-				"nfs4_decode_setclientid: Server returned operation"
+		dprintk("nfs: decode_setclientid: Server returned operation"
 			       	" %d\n", opnum);
 		return -EIO;
 	}
···
 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
 	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
 		goto out;
-	if ((status = decode_putfh(&xdr)) == 0)
-		status = decode_access(&xdr, res);
+	status = decode_putfh(&xdr);
+	if (status != 0)
+		goto out;
+	status = decode_access(&xdr, res);
+	if (status != 0)
+		goto out;
+	decode_getfattr(&xdr, res->fattr, res->server);
 out:
 	return status;
 }

fs/nfs/nfsroot.c

···
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/xprtsock.h>
 #include <linux/nfs.h>
 #include <linux/nfs_fs.h>
 #include <linux/nfs_mount.h>
···
 	struct sockaddr_in sin;
 	int status;
 	int protocol = (nfs_data.flags & NFS_MOUNT_TCP) ?
-					IPPROTO_TCP : IPPROTO_UDP;
+					XPRT_TRANSPORT_TCP : XPRT_TRANSPORT_UDP;
 	int version = (nfs_data.flags & NFS_MOUNT_VER3) ?
 					NFS_MNT3_VERSION : NFS_MNT_VERSION;
 

fs/nfs/proc.c

···
 	dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 
+	nfs_invalidate_atime(dir);
+
 	dprintk("NFS reply readdir: %d\n", status);
 	return status;
 }
···
 
 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
 {
+	nfs_invalidate_atime(data->inode);
 	if (task->tk_status >= 0) {
 		nfs_refresh_inode(data->inode, data->res.fattr);
 		/* Emulate the eof flag, which isn't normally needed in NFSv2
···
 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 {
 	if (task->tk_status >= 0)
-		nfs_post_op_update_inode(data->inode, data->res.fattr);
+		nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
 	return 0;
 }
 

fs/nfs/read.c

···
 		set_bit(NFS_INO_STALE, &NFS_FLAGS(data->inode));
 		nfs_mark_for_revalidate(data->inode);
 	}
-	spin_lock(&data->inode->i_lock);
-	NFS_I(data->inode)->cache_validity |= NFS_INO_INVALID_ATIME;
-	spin_unlock(&data->inode->i_lock);
 	return 0;
 }
 
···
 		if (ctx == NULL)
 			goto out_unlock;
 	} else
-		ctx = get_nfs_open_context((struct nfs_open_context *)
-				file->private_data);
+		ctx = get_nfs_open_context(nfs_file_open_context(file));
 
 	error = nfs_readpage_async(ctx, inode, page);
 
···
 		if (desc.ctx == NULL)
 			return -EBADF;
 	} else
-		desc.ctx = get_nfs_open_context((struct nfs_open_context *)
-				filp->private_data);
+		desc.ctx = get_nfs_open_context(nfs_file_open_context(filp));
 	if (rsize < PAGE_CACHE_SIZE)
 		nfs_pageio_init(&pgio, inode, nfs_pagein_multi, rsize, 0);
 	else

fs/nfs/super.c

···
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/stats.h>
 #include <linux/sunrpc/metrics.h>
+#include <linux/sunrpc/xprtsock.h>
+#include <linux/sunrpc/xprtrdma.h>
 #include <linux/nfs_fs.h>
 #include <linux/nfs_mount.h>
 #include <linux/nfs4_mount.h>
···
 
 #define NFSDBG_FACILITY		NFSDBG_VFS
 
-
-struct nfs_parsed_mount_data {
-	int			flags;
-	int			rsize, wsize;
-	int			timeo, retrans;
-	int			acregmin, acregmax,
-				acdirmin, acdirmax;
-	int			namlen;
-	unsigned int		bsize;
-	unsigned int		auth_flavor_len;
-	rpc_authflavor_t	auth_flavors[1];
-	char			*client_address;
-
-	struct {
-		struct sockaddr_in	address;
-		unsigned int		program;
-		unsigned int		version;
-		unsigned short		port;
-		int			protocol;
-	} mount_server;
-
-	struct {
-		struct sockaddr_in	address;
-		char			*hostname;
-		char			*export_path;
-		unsigned int		program;
-		int			protocol;
-	} nfs_server;
-};
-
 enum {
 	/* Mount options that take no arguments */
 	Opt_soft, Opt_hard,
···
 	Opt_ac, Opt_noac,
 	Opt_lock, Opt_nolock,
 	Opt_v2, Opt_v3,
-	Opt_udp, Opt_tcp,
+	Opt_udp, Opt_tcp, Opt_rdma,
 	Opt_acl, Opt_noacl,
 	Opt_rdirplus, Opt_nordirplus,
 	Opt_sharecache, Opt_nosharecache,
···
 
 	/* Mount options that take string arguments */
 	Opt_sec, Opt_proto, Opt_mountproto,
-	Opt_addr, Opt_mounthost, Opt_clientaddr,
+	Opt_addr, Opt_mountaddr, Opt_clientaddr,
 
 	/* Mount options that are ignored */
 	Opt_userspace, Opt_deprecated,
···
 	{ Opt_v3, "v3" },
 	{ Opt_udp, "udp" },
 	{ Opt_tcp, "tcp" },
+	{ Opt_rdma, "rdma" },
 	{ Opt_acl, "acl" },
 	{ Opt_noacl, "noacl" },
 	{ Opt_rdirplus, "rdirplus" },
···
 	{ Opt_mountproto, "mountproto=%s" },
 	{ Opt_addr, "addr=%s" },
 	{ Opt_clientaddr, "clientaddr=%s" },
-	{ Opt_mounthost, "mounthost=%s" },
+	{ Opt_userspace, "mounthost=%s" },
+	{ Opt_mountaddr, "mountaddr=%s" },
 
 	{ Opt_err, NULL }
 };
 
 enum {
-	Opt_xprt_udp, Opt_xprt_tcp,
+	Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
 
 	Opt_xprt_err
 };
···
 static match_table_t nfs_xprt_protocol_tokens = {
 	{ Opt_xprt_udp, "udp" },
 	{ Opt_xprt_tcp, "tcp" },
+	{ Opt_xprt_rdma, "rdma" },
 
 	{ Opt_xprt_err, NULL }
 };
···
 		const char *nostr;
 	} nfs_info[] = {
 		{ NFS_MOUNT_SOFT, ",soft", ",hard" },
-		{ NFS_MOUNT_INTR, ",intr", "" },
+		{ NFS_MOUNT_INTR, ",intr", ",nointr" },
 		{ NFS_MOUNT_NOCTO, ",nocto", "" },
 		{ NFS_MOUNT_NOAC, ",noac", "" },
 		{ NFS_MOUNT_NONLM, ",nolock", "" },
···
 	};
 	const struct proc_nfs_info *nfs_infop;
 	struct nfs_client *clp = nfss->nfs_client;
-	char buf[12];
-	const char *proto;
 
 	seq_printf(m, ",vers=%d", clp->rpc_ops->version);
 	seq_printf(m, ",rsize=%d", nfss->rsize);
···
 		else
 			seq_puts(m, nfs_infop->nostr);
 	}
-	switch (nfss->client->cl_xprt->prot) {
-		case IPPROTO_TCP:
-			proto = "tcp";
-			break;
-		case IPPROTO_UDP:
-			proto = "udp";
-			break;
-		default:
-			snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
-			proto = buf;
-	}
-	seq_printf(m, ",proto=%s", proto);
+	seq_printf(m, ",proto=%s",
+		   rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
 	seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
 	seq_printf(m, ",retrans=%u", clp->retrans_count);
 	seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
···
 
 	nfs_show_mount_options(m, nfss, 0);
 
-	seq_puts(m, ",addr=");
-	seq_escape(m, nfss->nfs_client->cl_hostname, " \t\n\\");
+	seq_printf(m, ",addr="NIPQUAD_FMT,
+		NIPQUAD(nfss->nfs_client->cl_addr.sin_addr));
 
 	return 0;
 }
···
 			break;
 		case Opt_udp:
 			mnt->flags &= ~NFS_MOUNT_TCP;
-			mnt->nfs_server.protocol = IPPROTO_UDP;
+			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 			mnt->timeo = 7;
 			mnt->retrans = 5;
 			break;
 		case Opt_tcp:
 			mnt->flags |= NFS_MOUNT_TCP;
-			mnt->nfs_server.protocol = IPPROTO_TCP;
+			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+			mnt->timeo = 600;
+			mnt->retrans = 2;
+			break;
+		case Opt_rdma:
+			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
+			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 			mnt->timeo = 600;
 			mnt->retrans = 2;
 			break;
···
 			switch (token) {
 			case Opt_xprt_udp:
 				mnt->flags &= ~NFS_MOUNT_TCP;
-				mnt->nfs_server.protocol = IPPROTO_UDP;
+				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
 				mnt->timeo = 7;
 				mnt->retrans = 5;
 				break;
 			case Opt_xprt_tcp:
 				mnt->flags |= NFS_MOUNT_TCP;
-				mnt->nfs_server.protocol = IPPROTO_TCP;
+				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+				mnt->timeo = 600;
+				mnt->retrans = 2;
+				break;
+			case Opt_xprt_rdma:
+				/* vector side protocols to TCP */
+				mnt->flags |= NFS_MOUNT_TCP;
+				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
 				mnt->timeo = 600;
 				mnt->retrans = 2;
 				break;
···
 
 			switch (token) {
 			case Opt_xprt_udp:
-				mnt->mount_server.protocol = IPPROTO_UDP;
+				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
 				break;
 			case Opt_xprt_tcp:
-				mnt->mount_server.protocol = IPPROTO_TCP;
+				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
 				break;
+			case Opt_xprt_rdma: /* not used for side protocols */
 			default:
 				goto out_unrec_xprt;
 			}
···
 				goto out_nomem;
 			mnt->client_address = string;
 			break;
-		case Opt_mounthost:
+		case Opt_mountaddr:
 			string = match_strdup(args);
 			if (string == NULL)
 				goto out_nomem;
···
 		sin = args->mount_server.address;
 	else
 		sin = args->nfs_server.address;
-	if (args->mount_server.port == 0) {
-		status = rpcb_getport_sync(&sin,
-					   args->mount_server.program,
-					   args->mount_server.version,
-					   args->mount_server.protocol);
-		if (status < 0)
-			goto out_err;
-		sin.sin_port = htons(status);
-	} else
-		sin.sin_port = htons(args->mount_server.port);
+	/*
+	 * autobind will be used if mount_server.port == 0
+	 */
+	sin.sin_port = htons(args->mount_server.port);
 
 	/*
 	 * Now ask the mount server to map our export path
···
 			   args->mount_server.version,
 			   args->mount_server.protocol,
 			   root_fh);
-	if (status < 0)
-		goto out_err;
+	if (status == 0)
+		return 0;
 
-	return status;
-
-out_err:
-	dfprintk(MOUNT, "NFS: unable to contact server on host "
-		 NIPQUAD_FMT "\n", NIPQUAD(sin.sin_addr.s_addr));
+	dfprintk(MOUNT, "NFS: unable to mount server " NIPQUAD_FMT
+			", error %d\n", NIPQUAD(sin.sin_addr.s_addr), status);
 	return status;
 }
 
···
  * XXX: as far as I can tell, changing the NFS program number is not
  *      supported in the NFS client.
  */
-static int nfs_validate_mount_data(struct nfs_mount_data **options,
+static int nfs_validate_mount_data(void *options,
+				   struct nfs_parsed_mount_data *args,
 				   struct nfs_fh *mntfh,
 				   const char *dev_name)
 {
-	struct nfs_mount_data *data = *options;
+	struct nfs_mount_data *data = (struct nfs_mount_data *)options;
 
 	if (data == NULL)
 		goto out_no_data;
+
+	memset(args, 0, sizeof(*args));
+	args->flags		= (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
+	args->rsize		= NFS_MAX_FILE_IO_SIZE;
+	args->wsize		= NFS_MAX_FILE_IO_SIZE;
+	args->timeo		= 600;
+	args->retrans		= 2;
+	args->acregmin		= 3;
+	args->acregmax		= 60;
+	args->acdirmin		= 30;
+	args->acdirmax		= 60;
+	args->mount_server.protocol = XPRT_TRANSPORT_UDP;
+	args->mount_server.program = NFS_MNT_PROGRAM;
+	args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+	args->nfs_server.program = NFS_PROGRAM;
 
 	switch (data->version) {
 	case 1:
···
 		if (mntfh->size < sizeof(mntfh->data))
 			memset(mntfh->data + mntfh->size, 0,
 			       sizeof(mntfh->data) - mntfh->size);
+
+		if (!nfs_verify_server_address((struct sockaddr *) &data->addr))
+			goto out_no_address;
+
+		/*
+		 * Translate to nfs_parsed_mount_data, which nfs_fill_super
+		 * can deal with.
+		 */
+		args->flags		= data->flags;
+		args->rsize		= data->rsize;
+		args->wsize		= data->wsize;
+		args->flags		= data->flags;
+		args->timeo		= data->timeo;
+		args->retrans		= data->retrans;
+		args->acregmin		= data->acregmin;
+		args->acregmax		= data->acregmax;
+		args->acdirmin		= data->acdirmin;
+		args->acdirmax		= data->acdirmax;
+		args->nfs_server.address = data->addr;
+		if (!(data->flags & NFS_MOUNT_TCP))
+			args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
+		/* N.B. caller will free nfs_server.hostname in all cases */
+		args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
+		args->namlen		= data->namlen;
+		args->bsize		= data->bsize;
+		args->auth_flavors[0]	= data->pseudoflavor;
 		break;
 	default: {
 		unsigned int len;
 		char *c;
 		int status;
-		struct nfs_parsed_mount_data args = {
-			.flags		= (NFS_MOUNT_VER3 | NFS_MOUNT_TCP),
-			.rsize		= NFS_MAX_FILE_IO_SIZE,
-			.wsize		= NFS_MAX_FILE_IO_SIZE,
-			.timeo		= 600,
-			.retrans	= 2,
-			.acregmin	= 3,
-			.acregmax	= 60,
-			.acdirmin	= 30,
-			.acdirmax	= 60,
-			.mount_server.protocol = IPPROTO_UDP,
-			.mount_server.program = NFS_MNT_PROGRAM,
-			.nfs_server.protocol = IPPROTO_TCP,
-			.nfs_server.program = NFS_PROGRAM,
-		};
 
-		if (nfs_parse_mount_options((char *) *options, &args) == 0)
+		if (nfs_parse_mount_options((char *)options, args) == 0)
 			return -EINVAL;
 
-		data = kzalloc(sizeof(*data), GFP_KERNEL);
-		if (data == NULL)
-			return -ENOMEM;
-
-		/*
-		 * NB: after this point, caller will free "data"
-		 * if we return an error
-		 */
-		*options = data;
+		if (!nfs_verify_server_address((struct sockaddr *)
+						&args->nfs_server.address))
+			goto out_no_address;
 
 		c = strchr(dev_name, ':');
 		if (c == NULL)
 			return -EINVAL;
 		len = c - dev_name;
-		if (len > sizeof(data->hostname))
-			return -ENAMETOOLONG;
-		strncpy(data->hostname, dev_name, len);
-		args.nfs_server.hostname = data->hostname;
+		/* N.B. caller will free nfs_server.hostname in all cases */
+		args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
 
 		c++;
 		if (strlen(c) > NFS_MAXPATHLEN)
 			return -ENAMETOOLONG;
-		args.nfs_server.export_path = c;
+		args->nfs_server.export_path = c;
 
-		status = nfs_try_mount(&args, mntfh);
+		status = nfs_try_mount(args, mntfh);
 		if (status)
 			return status;
-
-		/*
-		 * Translate to nfs_mount_data, which nfs_fill_super
-		 * can deal with.
-		 */
-		data->version		= 6;
-		data->flags		= args.flags;
-		data->rsize		= args.rsize;
-		data->wsize		= args.wsize;
-		data->timeo		= args.timeo;
-		data->retrans		= args.retrans;
-		data->acregmin		= args.acregmin;
-		data->acregmax		= args.acregmax;
-		data->acdirmin		= args.acdirmin;
-		data->acdirmax		= args.acdirmax;
-		data->addr		= args.nfs_server.address;
-		data->namlen		= args.namlen;
-		data->bsize		= args.bsize;
-		data->pseudoflavor	= args.auth_flavors[0];
 
 		break;
 		}
 	}
 
-	if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
-		data->pseudoflavor = RPC_AUTH_UNIX;
+	if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
+		args->auth_flavors[0] = RPC_AUTH_UNIX;
 
 #ifndef CONFIG_NFS_V3
-	if (data->flags & NFS_MOUNT_VER3)
+	if (args->flags & NFS_MOUNT_VER3)
 		goto out_v3_not_compiled;
 #endif /* !CONFIG_NFS_V3 */
-
-	if (!nfs_verify_server_address((struct sockaddr *) &data->addr))
-		goto out_no_address;
 
 	return 0;
 
···
 /*
  * Finish setting up an NFS2/3 superblock
  */
-static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data)
+static void nfs_fill_super(struct super_block *sb,
+			   struct nfs_parsed_mount_data *data)
 {
 	struct nfs_server *server = NFS_SB(sb);
 
···
 	struct nfs_server *server = NULL;
 	struct super_block *s;
 	struct nfs_fh mntfh;
-	struct nfs_mount_data *data = raw_data;
+	struct nfs_parsed_mount_data data;
 	struct dentry *mntroot;
 	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
 	struct nfs_sb_mountdata sb_mntdata = {
···
 	int error;
 
 	/* Validate the mount data */
-	error = nfs_validate_mount_data(&data, &mntfh, dev_name);
+	error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
 	if (error < 0)
 		goto out;
 
 	/* Get a volume representation */
-	server = nfs_create_server(data, &mntfh);
+	server = nfs_create_server(&data, &mntfh);
 	if (IS_ERR(server)) {
 		error = PTR_ERR(server);
 		goto out;
···
 
 	if (!s->s_root) {
 		/* initial superblock/root creation */
-		nfs_fill_super(s, data);
+		nfs_fill_super(s, &data);
 	}
 
 	mntroot = nfs_get_root(s, &mntfh);
···
 	error = 0;
 
 out:
-	if (data != raw_data)
-		kfree(data);
+	kfree(data.nfs_server.hostname);
 	return error;
 
 out_err_nosb:
···
 /*
  * Validate NFSv4 mount options
  */
-static int nfs4_validate_mount_data(struct nfs4_mount_data **options,
-				    const char *dev_name,
-				    struct sockaddr_in *addr,
-				    rpc_authflavor_t *authflavour,
-				    char **hostname,
-				    char **mntpath,
-				    char **ip_addr)
+static int nfs4_validate_mount_data(void *options,
+				    struct nfs_parsed_mount_data *args,
+				    const char *dev_name)
 {
-	struct nfs4_mount_data *data = *options;
+	struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
 	char *c;
 
 	if (data == NULL)
 		goto out_no_data;
 
+	memset(args, 0, sizeof(*args));
+	args->rsize		= NFS_MAX_FILE_IO_SIZE;
+	args->wsize		= NFS_MAX_FILE_IO_SIZE;
+	args->timeo		= 600;
+	args->retrans		= 2;
+	args->acregmin		= 3;
+	args->acregmax		= 60;
+	args->acdirmin		= 30;
+	args->acdirmax		= 60;
+	args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+
 	switch (data->version) {
 	case 1:
-		if (data->host_addrlen != sizeof(*addr))
+		if (data->host_addrlen != sizeof(args->nfs_server.address))
 			goto out_no_address;
-		if (copy_from_user(addr, data->host_addr, sizeof(*addr)))
+		if (copy_from_user(&args->nfs_server.address,
+				   data->host_addr,
+				   sizeof(args->nfs_server.address)))
 			return -EFAULT;
-		if (addr->sin_port == 0)
-			addr->sin_port = htons(NFS_PORT);
-		if (!nfs_verify_server_address((struct sockaddr *) addr))
+		if (args->nfs_server.address.sin_port == 0)
+			args->nfs_server.address.sin_port = htons(NFS_PORT);
+		if (!nfs_verify_server_address((struct sockaddr *)
+						&args->nfs_server.address))
 			goto out_no_address;
 
 		switch (data->auth_flavourlen) {
 		case 0:
-			*authflavour = RPC_AUTH_UNIX;
+			args->auth_flavors[0] = RPC_AUTH_UNIX;
 			break;
 		case 1:
-			if (copy_from_user(authflavour, data->auth_flavours,
-					   sizeof(*authflavour)))
+			if (copy_from_user(&args->auth_flavors[0],
+					   data->auth_flavours,
+					   sizeof(args->auth_flavors[0])))
 				return -EFAULT;
 			break;
 		default:
···
 		c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
 		if (IS_ERR(c))
 			return PTR_ERR(c);
-		*hostname = c;
+		args->nfs_server.hostname = c;
 
 		c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
 		if (IS_ERR(c))
 			return PTR_ERR(c);
-		*mntpath = c;
-		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *mntpath);
+		args->nfs_server.export_path = c;
+		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
 
 		c = strndup_user(data->client_addr.data, 16);
 		if (IS_ERR(c))
 			return PTR_ERR(c);
-		*ip_addr = c;
+		args->client_address = c;
+
+		/*
+		 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
+		 * can deal with.
+		 */
+
+		args->flags	= data->flags & NFS4_MOUNT_FLAGMASK;
+		args->rsize	= data->rsize;
+		args->wsize	= data->wsize;
+		args->timeo	= data->timeo;
+		args->retrans	= data->retrans;
+		args->acregmin	= data->acregmin;
+		args->acregmax	= data->acregmax;
+		args->acdirmin	= data->acdirmin;
+		args->acdirmax	= data->acdirmax;
+		args->nfs_server.protocol = data->proto;
 
 		break;
 	default: {
 		unsigned int len;
-		struct nfs_parsed_mount_data args = {
-			.rsize		= NFS_MAX_FILE_IO_SIZE,
-			.wsize		= NFS_MAX_FILE_IO_SIZE,
-			.timeo		= 600,
-			.retrans	= 2,
-			.acregmin	= 3,
-			.acregmax	= 60,
-			.acdirmin	= 30,
-			.acdirmax	= 60,
-			.nfs_server.protocol = IPPROTO_TCP,
-		};
 
-		if (nfs_parse_mount_options((char *) *options, &args) == 0)
+		if (nfs_parse_mount_options((char *)options, args) == 0)
 			return -EINVAL;
 
 		if (!nfs_verify_server_address((struct sockaddr *)
-						&args.nfs_server.address))
+						&args->nfs_server.address))
 			return -EINVAL;
-		*addr = args.nfs_server.address;
 
-		switch (args.auth_flavor_len) {
+		switch (args->auth_flavor_len) {
 		case 0:
-			*authflavour = RPC_AUTH_UNIX;
+			args->auth_flavors[0] = RPC_AUTH_UNIX;
 			break;
 		case 1:
-			*authflavour = (rpc_authflavor_t) args.auth_flavors[0];
 			break;
 		default:
 			goto out_inval_auth;
 		}
-
-		/*
-		 * Translate to nfs4_mount_data, which nfs4_fill_super
-		 * can deal with.
-		 */
-		data = kzalloc(sizeof(*data), GFP_KERNEL);
-		if (data == NULL)
-			return -ENOMEM;
-		*options = data;
-
-		data->version	= 1;
-		data->flags	= args.flags & NFS4_MOUNT_FLAGMASK;
-		data->rsize	= args.rsize;
-		data->wsize	= args.wsize;
-		data->timeo	= args.timeo;
-		data->retrans	= args.retrans;
-		data->acregmin	= args.acregmin;
-		data->acregmax	= args.acregmax;
-		data->acdirmin	= args.acdirmin;
-		data->acdirmax	= args.acdirmax;
-		data->proto	= args.nfs_server.protocol;
 
 		/*
 		 * Split "dev_name" into "hostname:mntpath".
···
 		len = c - dev_name;
 		if (len > NFS4_MAXNAMLEN)
 			return -ENAMETOOLONG;
-		*hostname = kzalloc(len, GFP_KERNEL);
-		if (*hostname == NULL)
+		args->nfs_server.hostname = kzalloc(len, GFP_KERNEL);
+		if (args->nfs_server.hostname == NULL)
 			return -ENOMEM;
-		strncpy(*hostname, dev_name, len - 1);
+		strncpy(args->nfs_server.hostname, dev_name, len - 1);
 
 		c++;			/* step over the ':' */
 		len = strlen(c);
 		if (len > NFS4_MAXPATHLEN)
 			return -ENAMETOOLONG;
-		*mntpath = kzalloc(len + 1, GFP_KERNEL);
-		if (*mntpath == NULL)
+		args->nfs_server.export_path = kzalloc(len + 1, GFP_KERNEL);
+		if (args->nfs_server.export_path == NULL)
 			return -ENOMEM;
-		strncpy(*mntpath, c, len);
+		strncpy(args->nfs_server.export_path, c, len);
 
-		dprintk("MNTPATH: %s\n", *mntpath);
+		dprintk("MNTPATH: %s\n", args->nfs_server.export_path);
 
-		if (args.client_address == NULL)
+		if (args->client_address == NULL)
 			goto out_no_client_address;
-
-		*ip_addr = args.client_address;
 
 		break;
 		}
···
 static int nfs4_get_sb(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
 {
-	struct nfs4_mount_data *data = raw_data;
+	struct nfs_parsed_mount_data data;
 	struct super_block *s;
 	struct nfs_server *server;
-	struct sockaddr_in addr;
-	rpc_authflavor_t authflavour;
 	struct nfs_fh mntfh;
 	struct dentry *mntroot;
-	char *mntpath = NULL, *hostname = NULL, *ip_addr = NULL;
 	int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
 	struct nfs_sb_mountdata sb_mntdata = {
 		.mntflags = flags,
···
 	int error;
 
 	/* Validate the mount data */
-	error = nfs4_validate_mount_data(&data, dev_name, &addr, &authflavour,
-					 &hostname, &mntpath, &ip_addr);
+	error = nfs4_validate_mount_data(raw_data, &data, dev_name);
 	if (error < 0)
 		goto out;
 
 	/* Get a volume representation */
-	server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr,
-				    authflavour, &mntfh);
+	server = nfs4_create_server(&data, &mntfh);
 	if (IS_ERR(server)) {
 		error = PTR_ERR(server);
 		goto out;
···
 	error = 0;
 
 out:
-	kfree(ip_addr);
-	kfree(mntpath);
-	kfree(hostname);
+	kfree(data.client_address);
+	kfree(data.nfs_server.export_path);
+	kfree(data.nfs_server.hostname);
 	return error;
 
 out_free:

fs/nfs/unlink.c

···
 		.rpc_cred = data->cred,
 	};
 
-	nfs_begin_data_update(dir);
 	NFS_PROTO(dir)->unlink_setup(&msg, dir);
 	rpc_call_setup(task, &msg, 0);
 }
···
 
 	if (!NFS_PROTO(dir)->unlink_done(task, dir))
 		rpc_restart_call(task);
-	else
-		nfs_end_data_update(dir);
 }
 
 /**

fs/nfs/write.c

···
 	nfs_writedata_free(wdata);
 }
 
+static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
+{
+	ctx->error = error;
+	smp_wmb();
+	set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
+}
+
 static struct nfs_page *nfs_page_find_request_locked(struct page *page)
 {
 	struct nfs_page *req = NULL;
···
 
 /*
  * Find an associated nfs write request, and prepare to flush it out
- * Returns 1 if there was no write request, or if the request was
- * already tagged by nfs_set_page_dirty.Returns 0 if the request
- * was not tagged.
- * May also return an error if the user signalled nfs_wait_on_request().
+ * May return an error if the user signalled nfs_wait_on_request().
  */
 static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
 				struct page *page)
···
 		req = nfs_page_find_request_locked(page);
 		if (req == NULL) {
 			spin_unlock(&inode->i_lock);
-			return 1;
+			return 0;
 		}
 		if (nfs_lock_request_dontget(req))
 			break;
···
 		spin_unlock(&inode->i_lock);
 		nfs_unlock_request(req);
 		nfs_pageio_complete(pgio);
-		return 1;
+		return 0;
 	}
 	if (nfs_set_page_writeback(page) != 0) {
 		spin_unlock(&inode->i_lock);
···
 	}
 	radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index,
 			NFS_PAGE_TAG_LOCKED);
-	ret = test_bit(PG_NEED_FLUSH, &req->wb_flags);
 	spin_unlock(&inode->i_lock);
 	nfs_pageio_add_request(pgio, req);
-	return ret;
+	return 0;
+}
+
+static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
+{
+	struct inode *inode = page->mapping->host;
+
+	nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
+	nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
+
+	nfs_pageio_cond_complete(pgio, page->index);
+	return nfs_page_async_flush(pgio, page);
 }
 
 /*
···
  */
 static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
 {
-	struct nfs_pageio_descriptor mypgio, *pgio;
-	struct nfs_open_context *ctx;
-	struct inode *inode = page->mapping->host;
-	unsigned offset;
+	struct nfs_pageio_descriptor pgio;
 	int err;
 
-	nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
-	nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
-
-	if (wbc->for_writepages)
-		pgio = wbc->fs_private;
-	else {
-		nfs_pageio_init_write(&mypgio, inode, wb_priority(wbc));
-		pgio = &mypgio;
-	}
-
-	nfs_pageio_cond_complete(pgio, page->index);
-
-	err = nfs_page_async_flush(pgio, page);
-	if (err <= 0)
-		goto out;
-	err = 0;
-	offset = nfs_page_length(page);
-	if (!offset)
-		goto out;
-
-	nfs_pageio_cond_complete(pgio, page->index);
-
-	ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE);
-	if (ctx == NULL) {
-		err = -EBADF;
-		goto out;
-	}
-	err = nfs_writepage_setup(ctx, page, 0, offset);
-	put_nfs_open_context(ctx);
-	if (err != 0)
-		goto out;
-	err = nfs_page_async_flush(pgio, page);
-	if (err > 0)
-		err = 0;
-out:
-	if (!wbc->for_writepages)
-		nfs_pageio_complete(pgio);
-	return err;
+	nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc));
+	err = nfs_do_writepage(page, wbc, &pgio);
+	nfs_pageio_complete(&pgio);
+	if (err < 0)
+		return err;
+	if (pgio.pg_error < 0)
+		return pgio.pg_error;
+	return 0;
 }
 
 int nfs_writepage(struct page *page, struct writeback_control *wbc)
 {
-	int err;
+	int ret;
 
-	err = nfs_writepage_locked(page, wbc);
+	ret = nfs_writepage_locked(page, wbc);
 	unlock_page(page);
-	return err; 
+	return ret;
+}
+
+static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
+{
+	int ret;
+
+	ret = nfs_do_writepage(page, wbc, data);
+	unlock_page(page);
+	return ret;
 }
 
 int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
···
 	nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
 
 	nfs_pageio_init_write(&pgio, inode, wb_priority(wbc));
-	wbc->fs_private = &pgio;
-	err = generic_writepages(mapping, wbc);
+	err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
 	nfs_pageio_complete(&pgio);
-	if (err)
+	if (err < 0)
 		return err;
-	if (pgio.pg_error)
+	if (pgio.pg_error < 0)
 		return pgio.pg_error;
 	return 0;
 }
···
 		return error;
 	if (!nfsi->npages) {
 		igrab(inode);
-		nfs_begin_data_update(inode);
 		if (nfs_have_delegation(inode, FMODE_WRITE))
 			nfsi->change_attr++;
 	}
 	SetPagePrivate(req->wb_page);
 	set_page_private(req->wb_page, (unsigned long)req);
-	if (PageDirty(req->wb_page))
-		set_bit(PG_NEED_FLUSH, &req->wb_flags);
 	nfsi->npages++;
 	kref_get(&req->wb_kref);
 	return 0;
···
 	set_page_private(req->wb_page, 0);
 	ClearPagePrivate(req->wb_page);
 	radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index);
-	if (test_and_clear_bit(PG_NEED_FLUSH, &req->wb_flags))
-		__set_page_dirty_nobuffers(req->wb_page);
 	nfsi->npages--;
 	if (!nfsi->npages) {
 		spin_unlock(&inode->i_lock);
-		nfs_end_data_update(inode);
 		iput(inode);
 	} else
 		spin_unlock(&inode->i_lock);
···
 
 int nfs_flush_incompatible(struct file *file, struct page *page)
 {
-	struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
+	struct nfs_open_context *ctx = nfs_file_open_context(file);
 	struct nfs_page	*req;
 	int do_flush, status;
 	/*
···
 int nfs_updatepage(struct file *file, struct page *page,
 		unsigned int offset, unsigned int count)
 {
-	struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
+	struct nfs_open_context *ctx = nfs_file_open_context(file);
 	struct inode	*inode = page->mapping->host;
 	int		status = 0;
 
···
 
 	if (task->tk_status < 0) {
 		nfs_set_pageerror(page);
-		req->wb_context->error = task->tk_status;
+		nfs_context_set_write_error(req->wb_context, task->tk_status);
 		dprintk(", error = %d\n", task->tk_status);
 		goto out;
 	}
···
 
 		if (task->tk_status < 0) {
 			nfs_set_pageerror(page);
-			req->wb_context->error = task->tk_status;
+			nfs_context_set_write_error(req->wb_context, task->tk_status);
 			dprintk(", error = %d\n", task->tk_status);
 			goto remove_request;
 		}
···
 			req->wb_bytes,
 			(long long)req_offset(req));
 		if (task->tk_status < 0) {
-			req->wb_context->error = task->tk_status;
+			nfs_context_set_write_error(req->wb_context, task->tk_status);
 			nfs_inode_remove_request(req);
 			dprintk(", error = %d\n", task->tk_status);
 			goto next;
···
 	return ret;
 }
 
-/*
- * flush the inode to disk.
- */
-int nfs_wb_all(struct inode *inode)
+static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
 {
-	struct address_space *mapping = inode->i_mapping;
+	int ret;
+
+	ret = nfs_writepages(mapping, wbc);
+	if (ret < 0)
+		goto out;
+	ret = nfs_sync_mapping_wait(mapping, wbc, how);
+	if (ret < 0)
+		goto out;
+	return 0;
+out:
+	__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
+	return ret;
+}
+
+/* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */
+static int nfs_write_mapping(struct address_space *mapping, int how)
+{
 	struct writeback_control wbc = {
 		.bdi = mapping->backing_dev_info,
-		.sync_mode = WB_SYNC_ALL,
+		.sync_mode = WB_SYNC_NONE,
 		.nr_to_write = LONG_MAX,
 		.for_writepages = 1,
 		.range_cyclic = 1,
 	};
 	int ret;
 
-	ret = nfs_writepages(mapping, &wbc);
+	ret = __nfs_write_mapping(mapping, &wbc, how);
 	if (ret < 0)
-		goto out;
-	ret = nfs_sync_mapping_wait(mapping, &wbc, 0);
-	if (ret >= 0)
-		return 0;
-out:
-	__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
-	return ret;
+		return ret;
+	wbc.sync_mode = WB_SYNC_ALL;
+	return __nfs_write_mapping(mapping, &wbc, how);
 }
 
-int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how)
+/*
+ * flush the inode to disk.
+ */
+int nfs_wb_all(struct inode *inode)
 {
-	struct writeback_control wbc = {
-		.bdi = mapping->backing_dev_info,
-		.sync_mode = WB_SYNC_ALL,
-		.nr_to_write = LONG_MAX,
-		.range_start = range_start,
-		.range_end = range_end,
-		.for_writepages = 1,
-	};
-	int ret;
+	return nfs_write_mapping(inode->i_mapping, 0);
+}
 
-	ret = nfs_writepages(mapping, &wbc);
-	if (ret < 0)
-		goto out;
-	ret = nfs_sync_mapping_wait(mapping, &wbc, how);
-	if (ret >= 0)
-		return 0;
-out:
-	__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
-	return ret;
+int nfs_wb_nocommit(struct inode *inode)
+{
+	return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT);
 }
 
 int nfs_wb_page_cancel(struct inode *inode, struct page *page)
···
 {
 	return nfs_wb_page_priority(inode, page, FLUSH_STABLE);
 }
-
-int nfs_set_page_dirty(struct page *page)
-{
-	struct address_space *mapping = page->mapping;
-	struct inode *inode;
-	struct nfs_page *req;
-	int ret;
-
-	if (!mapping)
-		goto out_raced;
-	inode = mapping->host;
-	if (!inode)
-		goto out_raced;
-	spin_lock(&inode->i_lock);
-	req = nfs_page_find_request_locked(page);
-	if (req != NULL) {
-		/* Mark any existing write requests for flushing */
-		ret = !test_and_set_bit(PG_NEED_FLUSH, &req->wb_flags);
-		spin_unlock(&inode->i_lock);
-		nfs_release_request(req);
-		return ret;
-	}
-	ret = __set_page_dirty_nobuffers(page);
-	spin_unlock(&inode->i_lock);
-	return ret;
-out_raced:
-	return !TestSetPageDirty(page);
-}
-
 
 int __init nfs_init_writepagecache(void)
 {

fs/nfsd/nfs4xdr.c

···
 out:						\
 	return status;				\
 xdr_error:					\
-	printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);	\
+	dprintk("NFSD: xdr error (%s:%d)\n",	\
+			__FILE__, __LINE__);	\
 	status = nfserr_bad_xdr;		\
 	goto out
 
···
 	if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
  		savemem(argp, p, nbytes) :	\
  		(char *)p)) {			\
-		printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
+		dprintk("NFSD: xdr error (%s:%d)\n", \
+				__FILE__, __LINE__); \
 		goto xdr_error;			\
 		}				\
 	p += XDR_QUADLEN(nbytes);		\
···
 		p = argp->p;			\
 		argp->p += XDR_QUADLEN(nbytes);	\
 	} else if (!(p = read_buf(argp, nbytes))) { \
-		printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
+		dprintk("NFSD: xdr error (%s:%d)\n", \
+				__FILE__, __LINE__); \
 		goto xdr_error;			\
 	}					\
 } while (0)
···
 	 */
 	avail = (char*)argp->end - (char*)argp->p;
 	if (avail + argp->pagelen < write->wr_buflen) {
-		printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); 
+		dprintk("NFSD: xdr error (%s:%d)\n",
+				__FILE__, __LINE__);
 		goto xdr_error;
 	}
 	argp->rqstp->rq_vec[0].iov_base = p;
···
 		argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
 		if (!argp->ops) {
 			argp->ops = argp->iops;
-			printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
+			dprintk("nfsd: couldn't allocate room for COMPOUND\n");
 			goto xdr_error;
 		}
 	}
···
 	path = exp->ex_path;
 
 	if (strncmp(path, rootpath, strlen(rootpath))) {
-		printk("nfsd: fs_locations failed;"
+		dprintk("nfsd: fs_locations failed;"
 			"%s is not contained in %s\n", path, rootpath);
 		*stat = nfserr_notsupp;
 		return NULL;

include/linux/jiffies.h

···
 	 ((long)(a) - (long)(b) >= 0))
 #define time_before_eq(a,b)	time_after_eq(b,a)
 
+#define time_in_range(a,b,c) \
+	(time_after_eq(a,b) && \
+	 time_before_eq(a,c))
+
 /* Same as above, but does so with platform independent 64bit types.
  * These must be used when utilizing jiffies_64 (i.e. return value of
  * get_jiffies_64() */

include/linux/nfs_fs.h

···
 #include <linux/nfs3.h>
 #include <linux/nfs4.h>
 #include <linux/nfs_xdr.h>
-
 #include <linux/nfs_fs_sb.h>
 
-#include <linux/rwsem.h>
 #include <linux/mempool.h>
 
 /*
···
 	struct nfs4_state *state;
 	fl_owner_t lockowner;
 	int mode;
+
+	unsigned long flags;
+#define NFS_CONTEXT_ERROR_WRITE		(0)
 	int error;
 
 	struct list_head list;
···
 	 * server.
 	 */
 	unsigned long		cache_change_attribute;
-	/*
-	 * Counter indicating the number of outstanding requests that
-	 * will cause a file data update.
-	 */
-	atomic_t		data_updates;
 
 	struct rb_root		access_cache;
 	struct list_head	access_cache_entry_lru;
···
 #define NFS_CLIENT(inode)		(NFS_SERVER(inode)->client)
 #define NFS_PROTO(inode)		(NFS_SERVER(inode)->nfs_client->rpc_ops)
 #define NFS_COOKIEVERF(inode)		(NFS_I(inode)->cookieverf)
-#define NFS_READTIME(inode)		(NFS_I(inode)->read_cache_jiffies)
-#define NFS_CHANGE_ATTR(inode)		(NFS_I(inode)->change_attr)
-#define NFS_ATTRTIMEO(inode)		(NFS_I(inode)->attrtimeo)
 #define NFS_MINATTRTIMEO(inode) \
 	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
 			       : NFS_SERVER(inode)->acregmin)
 #define NFS_MAXATTRTIMEO(inode) \
 	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
 			       : NFS_SERVER(inode)->acregmax)
-#define NFS_ATTRTIMEO_UPDATE(inode)	(NFS_I(inode)->attrtimeo_timestamp)
 
 #define NFS_FLAGS(inode)		(NFS_I(inode)->flags)
 #define NFS_STALE(inode)		(test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
 
 #define NFS_FILEID(inode)		(NFS_I(inode)->fileid)
-
-static inline int nfs_caches_unstable(struct inode *inode)
-{
-	return atomic_read(&NFS_I(inode)->data_updates) != 0;
-}
 
 static inline void nfs_mark_for_revalidate(struct inode *inode)
 {
···
 	spin_unlock(&inode->i_lock);
 }
 
-static inline void NFS_CACHEINV(struct inode *inode)
-{
-	if (!nfs_caches_unstable(inode))
-		nfs_mark_for_revalidate(inode);
-}
-
 static inline int nfs_server_capable(struct inode *inode, int cap)
 {
 	return NFS_SERVER(inode)->caps & cap;
···
 	return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
 }
 
-/**
- * nfs_save_change_attribute - Returns the inode attribute change cookie
- * @inode - pointer to inode
- * The "change attribute" is updated every time we finish an operation
- * that will result in a metadata change on the server.
- */
-static inline long nfs_save_change_attribute(struct inode *inode)
+static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
 {
-	return NFS_I(inode)->cache_change_attribute;
+	dentry->d_time = verf;
 }
 
 /**
- * nfs_verify_change_attribute - Detects NFS inode cache updates
- * @inode - pointer to inode
- * @chattr - previously saved change attribute
- * Return "false" if metadata has been updated (or is in the process of
- * being updated) since the change attribute was saved.
+ * nfs_save_change_attribute - Returns the inode attribute change cookie
+ * @dir - pointer to parent directory inode
+ * The "change attribute" is updated every time we finish an operation
+ * that will result in a metadata change on the server.
  */
-static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
+static inline unsigned long nfs_save_change_attribute(struct inode *dir)
 {
-	return !nfs_caches_unstable(inode)
-		&& time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
+	return NFS_I(dir)->cache_change_attribute;
+}
+
+/**
+ * nfs_verify_change_attribute - Detects NFS remote directory changes
+ * @dir - pointer to parent directory inode
+ * @chattr - previously saved change attribute
+ * Return "false" if the verifiers doesn't match the change attribute.
+ * This would usually indicate that the directory contents have changed on
+ * the server, and that any dentries need revalidating.
+ */
+static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
+{
+	return chattr == NFS_I(dir)->cache_change_attribute;
 }
 
 /*
···
 extern int nfs_sync_mapping(struct address_space *mapping);
 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 extern void nfs_zap_caches(struct inode *);
+extern void nfs_invalidate_atime(struct inode *);
 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 				struct nfs_fattr *);
 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
+extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 extern int nfs_permission(struct inode *, int, struct nameidata *);
-extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
-extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
-extern void nfs_access_zap_cache(struct inode *inode);
 extern int nfs_open(struct inode *, struct file *);
 extern int nfs_release(struct inode *, struct file *);
 extern int nfs_attribute_timeout(struct inode *inode);
···
 extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping);
 extern int nfs_setattr(struct dentry *, struct iattr *);
 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
-extern void nfs_begin_attr_update(struct inode *);
-extern void nfs_end_attr_update(struct inode *);
-extern void nfs_begin_data_update(struct inode *);
-extern void nfs_end_data_update(struct inode *);
 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
+extern u64 nfs_compat_user_ino64(u64 fileid);
 
 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
···
 extern const struct file_operations nfs_file_operations;
 extern const struct address_space_operations nfs_file_aops;
 
+static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
+{
+	return filp->private_data;
+}
+
 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 {
-	if (file != NULL) {
-		struct nfs_open_context *ctx;
-
-		ctx = (struct nfs_open_context*)file->private_data;
-		return ctx->cred;
-	}
+	if (file != NULL)
+		return nfs_file_open_context(file)->cred;
 	return NULL;
 }
 
···
 extern struct dentry_operations nfs_dentry_operations;
 
 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
+extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
+extern void nfs_access_zap_cache(struct inode *inode);
 
 /*
  * linux/fs/nfs/symlink.c
···
 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 extern void nfs_writedata_release(void *);
-extern int nfs_set_page_dirty(struct page *);
 
 /*
  * Try to write back everything synchronously (but check the
  * return value!)
  */
 extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
-extern int nfs_sync_mapping_range(struct address_space *, loff_t, loff_t, int);
 extern int nfs_wb_all(struct inode *inode);
+extern int nfs_wb_nocommit(struct inode *inode);
 extern int nfs_wb_page(struct inode *inode, struct page* page);
 extern int nfs_wb_page_priority(struct inode *inode, struct page* page, int how);
 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);

include/linux/nfs_page.h

···
 #define PG_BUSY			0
 #define PG_NEED_COMMIT		1
 #define PG_NEED_RESCHED		2
-#define PG_NEED_FLUSH		3
 
 struct nfs_inode;
 struct nfs_page {

include/linux/nfs_xdr.h

···
 #define NFS_ATTR_FATTR		0x0002		/* post-op attributes */
 #define NFS_ATTR_FATTR_V3	0x0004		/* NFSv3 attributes */
 #define NFS_ATTR_FATTR_V4	0x0008		/* NFSv4 change attribute */
-#define NFS_ATTR_FATTR_V4_REFERRAL	0x0010		/* NFSv4 referral */
+#define NFS_ATTR_WCC_V4		0x0010		/* pre-op change attribute */
+#define NFS_ATTR_FATTR_V4_REFERRAL	0x0020		/* NFSv4 referral */
 
 /*
  * Info on the file system
···
 
 struct nfs4_accessargs {
 	const struct nfs_fh *		fh;
+	const u32 *			bitmask;
 	u32				access;
 };
 
 struct nfs4_accessres {
+	const struct nfs_server *	server;
+	struct nfs_fattr *		fattr;
 	u32				supported;
 	u32				access;
 };

include/linux/sunrpc/clnt.h

···
 
 struct rpc_clnt *rpc_create(struct rpc_create_args *args);
 struct rpc_clnt	*rpc_bind_new_program(struct rpc_clnt *,
-				struct rpc_program *, int);
+				struct rpc_program *, u32);
 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *);
 void		rpc_shutdown_client(struct rpc_clnt *);
 void		rpc_release_client(struct rpc_clnt *);

include/linux/sunrpc/debug.h

···
 	CTL_SLOTTABLE_TCP,
 	CTL_MIN_RESVPORT,
 	CTL_MAX_RESVPORT,
+	CTL_SLOTTABLE_RDMA,
+	CTL_RDMA_MAXINLINEREAD,
+	CTL_RDMA_MAXINLINEWRITE,
+	CTL_RDMA_WRITEPADDING,
+	CTL_RDMA_MEMREG,
 };
 
 #endif /* _LINUX_SUNRPC_DEBUG_H_ */

include/linux/sunrpc/msg_prot.h

···
 #define RPC_MAX_HEADER_WITH_AUTH \
 	(RPC_CALLHDRSIZE + 2*(2+RPC_MAX_AUTH_SIZE/4))
 
+/*
+ * RFC1833/RFC3530 rpcbind (v3+) well-known netid's.
+ */
+#define RPCBIND_NETID_UDP	"udp"
+#define RPCBIND_NETID_TCP	"tcp"
+#define RPCBIND_NETID_UDP6	"udp6"
+#define RPCBIND_NETID_TCP6	"tcp6"
+
+/*
+ * Note that RFC 1833 does not put any size restrictions on the
+ * netid string, but all currently defined netid's fit in 4 bytes.
+ */
+#define RPCBIND_MAXNETIDLEN	(4u)
 
 #endif /* __KERNEL__ */
 #endif /* _LINUX_SUNRPC_MSGPROT_H_ */

include/linux/sunrpc/rpc_rdma.h

···
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_SUNRPC_RPC_RDMA_H
+#define _LINUX_SUNRPC_RPC_RDMA_H
+
+struct rpcrdma_segment {
+	uint32_t rs_handle;	/* Registered memory handle */
+	uint32_t rs_length;	/* Length of the chunk in bytes */
+	uint64_t rs_offset;	/* Chunk virtual address or offset */
+};
+
+/*
+ * read chunk(s), encoded as a linked list.
+ */
+struct rpcrdma_read_chunk {
+	uint32_t rc_discrim;	/* 1 indicates presence */
+	uint32_t rc_position;	/* Position in XDR stream */
+	struct rpcrdma_segment rc_target;
+};
+
+/*
+ * write chunk, and reply chunk.
+ */
+struct rpcrdma_write_chunk {
+	struct rpcrdma_segment wc_target;
+};
+
+/*
+ * write chunk(s), encoded as a counted array.
+ */
+struct rpcrdma_write_array {
+	uint32_t wc_discrim;	/* 1 indicates presence */
+	uint32_t wc_nchunks;	/* Array count */
+	struct rpcrdma_write_chunk wc_array[0];
+};
+
+struct rpcrdma_msg {
+	uint32_t rm_xid;	/* Mirrors the RPC header xid */
+	uint32_t rm_vers;	/* Version of this protocol */
+	uint32_t rm_credit;	/* Buffers requested/granted */
+	uint32_t rm_type;	/* Type of message (enum rpcrdma_proc) */
+	union {
+
+		struct {			/* no chunks */
+			uint32_t rm_empty[3];	/* 3 empty chunk lists */
+		} rm_nochunks;
+
+		struct {			/* no chunks and padded */
+			uint32_t rm_align;	/* Padding alignment */
+			uint32_t rm_thresh;	/* Padding threshold */
+			uint32_t rm_pempty[3];	/* 3 empty chunk lists */
+		} rm_padded;
+
+		uint32_t rm_chunks[0];	/* read, write and reply chunks */
+
+	} rm_body;
+};
+
+#define RPCRDMA_HDRLEN_MIN	28
+
+enum rpcrdma_errcode {
+	ERR_VERS = 1,
+	ERR_CHUNK = 2
+};
+
+struct rpcrdma_err_vers {
+	uint32_t rdma_vers_low;	/* Version range supported by peer */
+	uint32_t rdma_vers_high;
+};
+
+enum rpcrdma_proc {
+	RDMA_MSG = 0,		/* An RPC call or reply msg */
+	RDMA_NOMSG = 1,		/* An RPC call or reply msg - separate body */
+	RDMA_MSGP = 2,		/* An RPC call or reply msg with padding */
+	RDMA_DONE = 3,		/* Client signals reply completion */
+	RDMA_ERROR = 4		/* An RPC RDMA encoding error */
+};
+
+#endif				/* _LINUX_SUNRPC_RPC_RDMA_H */

include/linux/sunrpc/xdr.h

···
 
 	struct page **	pages;		/* Array of contiguous pages */
 	unsigned int	page_base,	/* Start of page data */
-			page_len;	/* Length of page data */
+			page_len,	/* Length of page data */
+			flags;		/* Flags for data disposition */
+#define XDRBUF_READ		0x01		/* target of file read */
+#define XDRBUF_WRITE		0x02		/* source of file write */
 
 	unsigned int	buflen,		/* Total length of storage buffer */
 			len;		/* Length of XDR encoded message */

include/linux/sunrpc/xprt.h

···
 
 #ifdef __KERNEL__
 
-extern unsigned int xprt_udp_slot_table_entries;
-extern unsigned int xprt_tcp_slot_table_entries;
-
 #define RPC_MIN_SLOT_TABLE	(2U)
 #define RPC_DEF_SLOT_TABLE	(16U)
 #define RPC_MAX_SLOT_TABLE	(128U)
-
-/*
- * Parameters for choosing a free port
- */
-extern unsigned int xprt_min_resvport;
-extern unsigned int xprt_max_resvport;
-
-#define RPC_MIN_RESVPORT	(1U)
-#define RPC_MAX_RESVPORT	(65535U)
-#define RPC_DEF_MIN_RESVPORT	(665U)
-#define RPC_DEF_MAX_RESVPORT	(1023U)
 
 /*
  * This describes a timeout strategy
···
 	RPC_DISPLAY_PORT,
 	RPC_DISPLAY_PROTO,
 	RPC_DISPLAY_ALL,
+	RPC_DISPLAY_HEX_ADDR,
+	RPC_DISPLAY_HEX_PORT,
+	RPC_DISPLAY_UNIVERSAL_ADDR,
+	RPC_DISPLAY_NETID,
 	RPC_DISPLAY_MAX,
 };
 
···
 	char *			address_strings[RPC_DISPLAY_MAX];
 };
 
-struct rpc_xprtsock_create {
-	int			proto;		/* IPPROTO_UDP or IPPROTO_TCP */
+struct xprt_create {
+	int			ident;		/* XPRT_TRANSPORT identifier */
 	struct sockaddr *	srcaddr;	/* optional local address */
 	struct sockaddr *	dstaddr;	/* remote peer address */
 	size_t			addrlen;
 	struct rpc_timeout *	timeout;	/* optional timeout parameters */
+};
+
+struct xprt_class {
+	struct list_head	list;
+	int			ident;		/* XPRT_TRANSPORT identifier */
+	struct rpc_xprt *	(*setup)(struct xprt_create *);
+	struct module		*owner;
+	char			name[32];
 };
 
 /*
···
 /*
  * Generic internal transport functions
  */
-struct rpc_xprt *	xprt_create_transport(struct rpc_xprtsock_create *args);
+struct rpc_xprt		*xprt_create_transport(struct xprt_create *args);
 void			xprt_connect(struct rpc_task *task);
 void			xprt_reserve(struct rpc_task *task);
 int			xprt_reserve_xprt(struct rpc_task *task);
···
 /*
  * Transport switch helper functions
  */
+int			xprt_register_transport(struct xprt_class *type);
+int			xprt_unregister_transport(struct xprt_class *type);
 void			xprt_set_retrans_timeout_def(struct rpc_task *task);
 void			xprt_set_retrans_timeout_rtt(struct rpc_task *task);
 void			xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
···
 void			xprt_complete_rqst(struct rpc_task *task, int copied);
 void			xprt_release_rqst_cong(struct rpc_task *task);
 void			xprt_disconnect(struct rpc_xprt *xprt);
-
-/*
- * Socket transport setup operations
- */
-struct rpc_xprt *	xs_setup_udp(struct rpc_xprtsock_create *args);
-struct rpc_xprt *	xs_setup_tcp(struct rpc_xprtsock_create *args);
-int			init_socket_xprt(void);
-void			cleanup_socket_xprt(void);
 
 /*
  * Reserved bit positions in xprt->state

include/linux/sunrpc/xprtrdma.h

···
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_SUNRPC_XPRTRDMA_H
+#define _LINUX_SUNRPC_XPRTRDMA_H
+
+/*
+ * RPC transport identifier for RDMA
+ */
+#define XPRT_TRANSPORT_RDMA	256
+
+/*
+ * rpcbind (v3+) RDMA netid.
+ */
+#define RPCBIND_NETID_RDMA	"rdma"
+
+/*
+ * Constants. Max RPC/NFS header is big enough to account for
+ * additional marshaling buffers passed down by Linux client.
+ *
+ * RDMA header is currently fixed max size, and is big enough for a
+ * fully-chunked NFS message (read chunks are the largest). Note only
+ * a single chunk type per message is supported currently.
+ */
+#define RPCRDMA_MIN_SLOT_TABLE	(2U)
+#define RPCRDMA_DEF_SLOT_TABLE	(32U)
+#define RPCRDMA_MAX_SLOT_TABLE	(256U)
+
+#define RPCRDMA_DEF_INLINE  (1024)	/* default inline max */
+
+#define RPCRDMA_INLINE_PAD_THRESH  (512)/* payload threshold to pad (bytes) */
+
+#define RDMA_RESOLVE_TIMEOUT	(5*HZ)	/* TBD 5 seconds */
+#define RDMA_CONNECT_RETRY_MAX	(2)	/* retries if no listener backlog */
+
+/* memory registration strategies */
+#define RPCRDMA_PERSISTENT_REGISTRATION (1)
+
+enum rpcrdma_memreg {
+	RPCRDMA_BOUNCEBUFFERS = 0,
+	RPCRDMA_REGISTER,
+	RPCRDMA_MEMWINDOWS,
+	RPCRDMA_MEMWINDOWS_ASYNC,
+	RPCRDMA_MTHCAFMR,
+	RPCRDMA_ALLPHYSICAL,
+	RPCRDMA_LAST
+};
+
+#endif /* _LINUX_SUNRPC_XPRTRDMA_H */

include/linux/sunrpc/xprtsock.h

···
+/*
+ *  linux/include/linux/sunrpc/xprtsock.h
+ *
+ *  Declarations for the RPC transport socket provider.
+ */
+
+#ifndef _LINUX_SUNRPC_XPRTSOCK_H
+#define _LINUX_SUNRPC_XPRTSOCK_H
+
+#ifdef __KERNEL__
+
+/*
+ * Socket transport setup operations
+ */
+struct rpc_xprt *xs_setup_udp(struct xprt_create *args);
+struct rpc_xprt *xs_setup_tcp(struct xprt_create *args);
+
+int		init_socket_xprt(void);
+void		cleanup_socket_xprt(void);
+
+/*
+ * RPC transport identifiers for UDP, TCP
+ *
+ * To preserve compatibility with the historical use of raw IP protocol
+ * id's for transport selection, these are specified with the previous
+ * values. No such restriction exists for new transports, except that
+ * they may not collide with these values (17 and 6, respectively).
+ */
+#define XPRT_TRANSPORT_UDP	IPPROTO_UDP
+#define XPRT_TRANSPORT_TCP	IPPROTO_TCP
+
+/*
+ * RPC slot table sizes for UDP, TCP transports
+ */
+extern unsigned int xprt_udp_slot_table_entries;
+extern unsigned int xprt_tcp_slot_table_entries;
+
+/*
+ * Parameters for choosing a free port
+ */
+extern unsigned int xprt_min_resvport;
+extern unsigned int xprt_max_resvport;
+
+#define RPC_MIN_RESVPORT	(1U)
+#define RPC_MAX_RESVPORT	(65535U)
+#define RPC_DEF_MIN_RESVPORT	(665U)
+#define RPC_DEF_MAX_RESVPORT	(1023U)
+
+#endif /* __KERNEL__ */
+
+#endif /* _LINUX_SUNRPC_XPRTSOCK_H */

include/linux/writeback.h

···
 	unsigned for_reclaim:1;		/* Invoked from the page allocator */
 	unsigned for_writepages:1;	/* This is a writepages() call */
 	unsigned range_cyclic:1;	/* range_start is cyclic */
-
-	void *fs_private;		/* For use by ->writepages() */
 };
 
 /*

kernel/auditsc.c

···
 			context->names[idx].ino = (unsigned long)-1;
 	}
 }
+EXPORT_SYMBOL_GPL(__audit_inode_child);
 
 /**
  * auditsc_get_stamp - get local copies of audit_context values

net/sunrpc/Makefile

···
 
 obj-$(CONFIG_SUNRPC) += sunrpc.o
 obj-$(CONFIG_SUNRPC_GSS) += auth_gss/
+obj-$(CONFIG_SUNRPC_XPRT_RDMA) += xprtrdma/
 
 sunrpc-y := clnt.o xprt.o socklib.o xprtsock.o sched.o \
 	    auth.o auth_null.o auth_unix.o \

net/sunrpc/auth_gss/gss_krb5_wrap.c

···
 {
 	u8 *ptr;
 	u8 pad;
-	int len = buf->len;
+	size_t len = buf->len;
 
 	if (len <= buf->head[0].iov_len) {
 		pad = *(u8 *)(buf->head[0].iov_base + len - 1);
···
 	} else
 		len -= buf->head[0].iov_len;
 	if (len <= buf->page_len) {
-		int last = (buf->page_base + len - 1)
+		unsigned int last = (buf->page_base + len - 1)
 					>>PAGE_CACHE_SHIFT;
-		int offset = (buf->page_base + len - 1)
+		unsigned int offset = (buf->page_base + len - 1)
 					& (PAGE_CACHE_SIZE - 1);
 		ptr = kmap_atomic(buf->pages[last], KM_USER0);
 		pad = *(ptr + offset);

net/sunrpc/clnt.c

···
 	struct rpc_clnt		*clnt = NULL;
 	struct rpc_auth		*auth;
 	int err;
-	int len;
+	size_t len;
+
+	/* sanity check the name before trying to print it */
+	err = -EINVAL;
+	len = strlen(servname);
+	if (len > RPC_MAXNETNAMELEN)
+		goto out_no_rpciod;
+	len++;
 
 	dprintk("RPC:       creating %s client for %s (xprt %p)\n",
 			program->name, servname, xprt);
···
 	clnt->cl_parent = clnt;
 
 	clnt->cl_server = clnt->cl_inline_name;
-	len = strlen(servname) + 1;
 	if (len > sizeof(clnt->cl_inline_name)) {
 		char *buf = kmalloc(len, GFP_KERNEL);
 		if (buf != 0)
···
 {
 	struct rpc_xprt *xprt;
 	struct rpc_clnt *clnt;
-	struct rpc_xprtsock_create xprtargs = {
-		.proto = args->protocol,
+	struct xprt_create xprtargs = {
+		.ident = args->protocol,
 		.srcaddr = args->saddress,
 		.dstaddr = args->address,
 		.addrlen = args->addrsize,
···
 	 */
 	if (args->servername == NULL) {
 		struct sockaddr_in *addr =
-					(struct sockaddr_in *) &args->address;
+					(struct sockaddr_in *) args->address;
 		snprintf(servername, sizeof(servername), NIPQUAD_FMT,
 			NIPQUAD(addr->sin_addr.s_addr));
 		args->servername = servername;
···
 	xprt->resvport = 1;
 	if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
 		xprt->resvport = 0;
-
-	dprintk("RPC:       creating %s client for %s (xprt %p)\n",
-			args->program->name, args->servername, xprt);
 
 	clnt = rpc_new_client(xprt, args->servername, args->program,
 				args->version, args->authflavor);
···
  */
 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
 				      struct rpc_program *program,
-				      int vers)
+				      u32 vers)
 {
 	struct rpc_clnt *clnt;
 	struct rpc_version *version;
···
 	dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
 
 	if (RPC_IS_ASYNC(task) || !signalled()) {
-		xprt_release(task);
-		task->tk_action = call_reserve;
+		task->tk_action = call_allocate;
 		rpc_delay(task, HZ>>4);
 		return;
 	}
···
 	buf->head[0].iov_len = len;
 	buf->tail[0].iov_len = 0;
 	buf->page_len = 0;
+	buf->flags = 0;
 	buf->len = 0;
 	buf->buflen = len;
 }
···
 static void
 call_bind_status(struct rpc_task *task)
 {
-	int status = -EACCES;
+	int status = -EIO;
 
 	if (task->tk_status >= 0) {
 		dprint_status(task);
···
 	}
 
 	switch (task->tk_status) {
+	case -EAGAIN:
+		dprintk("RPC: %5u rpcbind waiting for another request "
+				"to finish\n", task->tk_pid);
+		/* avoid busy-waiting here -- could be a network outage. */
+		rpc_delay(task, 5*HZ);
+		goto retry_timeout;
 	case -EACCES:
 		dprintk("RPC: %5u remote rpcbind: RPC program/version "
 				"unavailable\n", task->tk_pid);
+		/* fail immediately if this is an RPC ping */
+		if (task->tk_msg.rpc_proc->p_proc == 0) {
+			status = -EOPNOTSUPP;
+			break;
+		}
 		rpc_delay(task, 3*HZ);
 		goto retry_timeout;
 	case -ETIMEDOUT:
···
 				task->tk_pid);
 		goto retry_timeout;
 	case -EPFNOSUPPORT:
+		/* server doesn't support any rpcbind version we know of */
 		dprintk("RPC: %5u remote rpcbind service unavailable\n",
 				task->tk_pid);
 		break;
···
 	default:
 		dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
 				task->tk_pid, -task->tk_status);
-		status = -EIO;
 	}
 
 	rpc_exit(task, status);
···
 {
 	dprint_status(task);
 
-	xprt_release(task);	/* Must do to obtain new XID */
 	task->tk_action = call_refreshresult;
 	task->tk_status = 0;
 	task->tk_client->cl_stats->rpcauthrefresh++;
···
 			dprintk("RPC: %5u %s: retry stale creds\n",
 					task->tk_pid, __FUNCTION__);
 			rpcauth_invalcred(task);
+			/* Ensure we obtain a new XID! */
+			xprt_release(task);
 			task->tk_action = call_refresh;
 			goto out_retry;
 		case RPC_AUTH_BADCRED:
···
 		spin_lock(&clnt->cl_lock);
 		list_for_each_entry(t, &clnt->cl_tasks, tk_task) {
 			const char *rpc_waitq = "none";
+			int proc;
+
+			if (t->tk_msg.rpc_proc)
+				proc = t->tk_msg.rpc_proc->p_proc;
+			else
+				proc = -1;
 
 			if (RPC_IS_QUEUED(t))
 				rpc_waitq = rpc_qname(t->u.tk_wait.rpc_waitq);
 
 			printk("%5u %04d %04x %6d %8p %6d %8p %8ld %8s %8p %8p\n",
-				t->tk_pid,
-				(t->tk_msg.rpc_proc ? t->tk_msg.rpc_proc->p_proc : -1),
+				t->tk_pid, proc,
 				t->tk_flags, t->tk_status,
 				t->tk_client,
 				(t->tk_client ? t->tk_client->cl_prog : 0),

net/sunrpc/rpc_pipe.c

···
 #include <linux/pagemap.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
-#include <linux/dnotify.h>
+#include <linux/fsnotify.h>
 #include <linux/kernel.h>
 
 #include <asm/ioctls.h>
···
 			clnt->cl_prog, clnt->cl_vers);
 	seq_printf(m, "address: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR));
 	seq_printf(m, "protocol: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PROTO));
+	seq_printf(m, "port: %s\n", rpc_peeraddr2str(clnt, RPC_DISPLAY_PORT));
 	return 0;
 }
 
···
 		if (S_ISDIR(mode))
 			inc_nlink(dir);
 		d_add(dentry, inode);
+		fsnotify_create(dir, dentry);
 	}
 	mutex_unlock(&dir->i_mutex);
 	return 0;
···
 	inode->i_ino = iunique(dir->i_sb, 100);
 	d_instantiate(dentry, inode);
 	inc_nlink(dir);
-	inode_dir_notify(dir, DN_CREATE);
+	fsnotify_mkdir(dir, dentry);
 	return 0;
 out_err:
 	printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
···
 	rpci->flags = flags;
 	rpci->ops = ops;
 	rpci->nkern_readwriters = 1;
-	inode_dir_notify(dir, DN_CREATE);
+	fsnotify_create(dir, dentry);
 	dget(dentry);
 out:
 	mutex_unlock(&dir->i_mutex);

net/sunrpc/rpcb_clnt.c

···
 
 #include <linux/types.h>
 #include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/xprtsock.h>
 
 #ifdef RPC_DEBUG
 # define RPCDBG_FACILITY	RPCDBG_BIND
···
 #define RPCB_MAXADDRLEN		(128u)
 
 /*
- * r_netid
- *
- * Quoting RFC 3530, section 2.2:
- *
- * For TCP over IPv4 the value of r_netid is the string "tcp".  For UDP
- * over IPv4 the value of r_netid is the string "udp".
- *
- * ...
- *
- * For TCP over IPv6 the value of r_netid is the string "tcp6".  For UDP
- * over IPv6 the value of r_netid is the string "udp6".
- */
-#define RPCB_NETID_UDP	"\165\144\160"		/* "udp" */
-#define RPCB_NETID_TCP	"\164\143\160"		/* "tcp" */
-#define RPCB_NETID_UDP6	"\165\144\160\066"	/* "udp6" */
-#define RPCB_NETID_TCP6	"\164\143\160\066"	/* "tcp6" */
-
-#define RPCB_MAXNETIDLEN	(4u)
-
-/*
  * r_owner
  *
  * The "owner" is allowed to unset a service in the rpcbind database.
···
 #define RPCB_MAXOWNERLEN	sizeof(RPCB_OWNER_STRING)
 
 static void			rpcb_getport_done(struct rpc_task *, void *);
-extern struct rpc_program	rpcb_program;
+static struct rpc_program	rpcb_program;
 
 struct rpcbind_args {
 	struct rpc_xprt *	r_xprt;
···
 static struct rpc_procinfo rpcb_procedures2[];
 static struct rpc_procinfo rpcb_procedures3[];
 
-static struct rpcb_info {
+struct rpcb_info {
 	int			rpc_vers;
 	struct rpc_procinfo *	rpc_proc;
-} rpcb_next_version[];
+};
+
+static struct rpcb_info rpcb_next_version[];
+static struct rpcb_info rpcb_next_version6[];
 
 static void rpcb_getport_prepare(struct rpc_task *task, void *calldata)
 {
···
 				   RPC_CLNT_CREATE_INTR),
 	};
 
-	((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
+	switch (srvaddr->sa_family) {
+	case AF_INET:
+		((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
+		break;
+	case AF_INET6:
+		((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
+		break;
+	default:
+		return NULL;
+	}
+
 	if (!privileged)
 		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
 	return rpc_create(&args);
···
 			prog, vers, prot, port);
 
 	rpcb_clnt = rpcb_create("localhost", (struct sockaddr *) &sin,
-					IPPROTO_UDP, 2, 1);
+					XPRT_TRANSPORT_UDP, 2, 1);
 	if (IS_ERR(rpcb_clnt))
 		return PTR_ERR(rpcb_clnt);
 
···
 	struct rpc_task	*child;
 	struct sockaddr addr;
 	int status;
+	struct rpcb_info *info;
 
 	dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
 		task->tk_pid, __FUNCTION__,
···
 	BUG_ON(clnt->cl_parent != clnt);
 
 	if (xprt_test_and_set_binding(xprt)) {
-		status = -EACCES;		/* tell caller to check again */
+		status = -EAGAIN;	/* tell caller to check again */
 		dprintk("RPC: %5u %s: waiting for another binder\n",
 			task->tk_pid, __FUNCTION__);
 		goto bailout_nowake;
···
 		goto bailout_nofree;
 	}
 
-	if (rpcb_next_version[xprt->bind_index].rpc_proc == NULL) {
+	rpc_peeraddr(clnt, (void *)&addr, sizeof(addr));
+
+	/* Don't ever use rpcbind v2 for AF_INET6 requests */
+	switch (addr.sa_family) {
+	case AF_INET:
+		info = rpcb_next_version;
+		break;
+	case AF_INET6:
+		info = rpcb_next_version6;
+		break;
+	default:
+		status = -EAFNOSUPPORT;
+		dprintk("RPC: %5u %s: bad address family\n",
+				task->tk_pid, __FUNCTION__);
+		goto bailout_nofree;
+	}
+	if (info[xprt->bind_index].rpc_proc == NULL) {
 		xprt->bind_index = 0;
-		status = -EACCES;	/* tell caller to try again later */
+		status = -EPFNOSUPPORT;
 		dprintk("RPC: %5u %s: no more getport versions available\n",
 			task->tk_pid, __FUNCTION__);
 		goto bailout_nofree;
 	}
-	bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
+	bind_version = info[xprt->bind_index].rpc_vers;
 
 	dprintk("RPC: %5u %s: trying rpcbind version %u\n",
 		task->tk_pid, __FUNCTION__, bind_version);
+
+	rpcb_clnt = rpcb_create(clnt->cl_server, &addr, xprt->prot,
+				bind_version, 0);
+	if (IS_ERR(rpcb_clnt)) {
+		status = PTR_ERR(rpcb_clnt);
+		dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
+			task->tk_pid, __FUNCTION__, PTR_ERR(rpcb_clnt));
+		goto bailout_nofree;
+	}
 
 	map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
 	if (!map) {
···
 	map->r_prot = xprt->prot;
 	map->r_port = 0;
 	map->r_xprt = xprt_get(xprt);
-	map->r_netid = (xprt->prot == IPPROTO_TCP) ? RPCB_NETID_TCP :
-						   RPCB_NETID_UDP;
-	memcpy(&map->r_addr, rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR),
-			sizeof(map->r_addr));
+	map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
+	memcpy(map->r_addr,
+	       rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR),
+	       sizeof(map->r_addr));
 	map->r_owner = RPCB_OWNER_STRING;	/* ignored for GETADDR */
-
-	rpc_peeraddr(clnt, (void *)&addr, sizeof(addr));
-	rpcb_clnt = rpcb_create(clnt->cl_server, &addr, xprt->prot, bind_version, 0);
-	if (IS_ERR(rpcb_clnt)) {
-		status = PTR_ERR(rpcb_clnt);
-		dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
-			task->tk_pid, __FUNCTION__, PTR_ERR(rpcb_clnt));
-		goto bailout;
-	}
 
 	child = rpc_run_task(rpcb_clnt, RPC_TASK_ASYNC, &rpcb_getport_ops, map);
 	rpc_release_client(rpcb_clnt);
···
 		status = -EIO;
 		dprintk("RPC: %5u %s: rpc_run_task failed\n",
 			task->tk_pid, __FUNCTION__);
-		goto bailout_nofree;
+		goto bailout;
 	}
 	rpc_put_task(child);
 
···
 bailout_nowake:
 	task->tk_status = status;
 }
+EXPORT_SYMBOL_GPL(rpcb_getport_async);
 
 /*
  * Rpcbind child task calls this callback via tk_exit.
···
 	struct rpcbind_args *map = data;
 	struct rpc_xprt *xprt = map->r_xprt;
 	int status = child->tk_status;
+
+	/* Garbage reply: retry with a lesser rpcbind version */
+	if (status == -EIO)
+		status = -EPROTONOSUPPORT;
 
 	/* rpcbind server doesn't support this rpcbind protocol version */
 	if (status == -EPROTONOSUPPORT)
···
 			       unsigned short *portp)
 {
 	char *addr;
-	int addr_len, c, i, f, first, val;
+	u32 addr_len;
+	int c, i, f, first, val;
 
 	*portp = 0;
-	addr_len = (unsigned int) ntohl(*p++);
-	if (addr_len > RPCB_MAXADDRLEN)			/* sanity */
-		return -EINVAL;
+	addr_len = ntohl(*p++);
 
-	dprintk("RPC:       rpcb_decode_getaddr returned string: '%s'\n",
-			(char *) p);
+	/*
+	 * Simple sanity check.  The smallest possible universal
+	 * address is an IPv4 address string containing 11 bytes.
+	 */
+	if (addr_len < 11 || addr_len > RPCB_MAXADDRLEN)
+		goto out_err;
 
+	/*
+	 * Start at the end and walk backwards until the first dot
+	 * is encountered.  When the second dot is found, we have
+	 * both parts of the port number.
+	 */
 	addr = (char *)p;
 	val = 0;
 	first = 1;
···
 		}
 	}
 
+	/*
+	 * Simple sanity check.  If we never saw a dot in the reply,
+	 * then this was probably just garbage.
+	 */
+	if (first)
+		goto out_err;
+
 	dprintk("RPC:       rpcb_decode_getaddr port=%u\n", *portp);
 	return 0;
+
+out_err:
+	dprintk("RPC:       rpcbind server returned malformed reply\n");
+	return -EIO;
 }
 
 #define RPCB_program_sz		(1u)
···
 #define RPCB_port_sz		(1u)
 #define RPCB_boolean_sz		(1u)
 
-#define RPCB_netid_sz		(1+XDR_QUADLEN(RPCB_MAXNETIDLEN))
+#define RPCB_netid_sz		(1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
 #define RPCB_addr_sz		(1+XDR_QUADLEN(RPCB_MAXADDRLEN))
 #define RPCB_ownerstring_sz	(1+XDR_QUADLEN(RPCB_MAXOWNERLEN))
 
···
 	{ 0, NULL },
 };
 
+static struct rpcb_info rpcb_next_version6[] = {
+#ifdef CONFIG_SUNRPC_BIND34
+	{ 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
+	{ 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
+#endif
+	{ 0, NULL },
+};
+
 static struct rpc_version rpcb_version2 = {
 	.number		= 2,
 	.nrprocs	= RPCB_HIGHPROC_2,
···
 
 static struct rpc_stat rpcb_stats;
 
-struct rpc_program rpcb_program = {
+static struct rpc_program rpcb_program = {
 	.name		= "rpcbind",
 	.number		= RPCBIND_PROGRAM,
 	.nrvers		= ARRAY_SIZE(rpcb_version),

net/sunrpc/sched.c

···
 			task->tk_pid, size, buf);
 	return &buf->data;
 }
+EXPORT_SYMBOL_GPL(rpc_malloc);
 
 /**
  * rpc_free - free buffer allocated via rpc_malloc
···
 	else
 		kfree(buf);
 }
+EXPORT_SYMBOL_GPL(rpc_free);
 
 /*
  * Creation and deletion of RPC task structures

net/sunrpc/socklib.c

···
 	desc->offset += len;
 	return len;
 }
+EXPORT_SYMBOL_GPL(xdr_skb_read_bits);
 
 /**
  * xdr_skb_read_and_csum_bits - copy and checksum from skb to buffer
···
 out:
 	return copied;
 }
+EXPORT_SYMBOL_GPL(xdr_partial_copy_from_skb);
 
 /**
  * csum_partial_copy_to_xdr - checksum and copy data
···
 		return -1;
 	return 0;
 }
+EXPORT_SYMBOL_GPL(csum_partial_copy_to_xdr);

net/sunrpc/sunrpc_syms.c

···
 #include <linux/sunrpc/auth.h>
 #include <linux/workqueue.h>
 #include <linux/sunrpc/rpc_pipe_fs.h>
-
+#include <linux/sunrpc/xprtsock.h>
 
 /* RPC scheduler */
 EXPORT_SYMBOL(rpc_execute);

net/sunrpc/timer.c

···
 
 #include <linux/types.h>
 #include <linux/unistd.h>
+#include <linux/module.h>
 
 #include <linux/sunrpc/clnt.h>
 
···
 		rt->ntimeouts[i] = 0;
 	}
 }
+EXPORT_SYMBOL_GPL(rpc_init_rtt);
 
 /*
  * NB: When computing the smoothed RTT and standard deviation,
···
 	if (*sdrtt < RPC_RTO_MIN)
 		*sdrtt = RPC_RTO_MIN;
 }
+EXPORT_SYMBOL_GPL(rpc_update_rtt);
 
 /*
  * Estimate rto for an nfs rpc sent via. an unreliable datagram.
···
 
 	return res;
 }
+EXPORT_SYMBOL_GPL(rpc_calc_rto);

net/sunrpc/xprt.c

···
 static void	xprt_connect_status(struct rpc_task *task);
 static int      __xprt_get_cong(struct rpc_xprt *, struct rpc_task *);
 
+static spinlock_t xprt_list_lock = SPIN_LOCK_UNLOCKED;
+static LIST_HEAD(xprt_list);
+
 /*
  * The transport code maintains an estimate on the maximum number of out-
  * standing RPC requests, using a smoothed version of the congestion
···
 #define RPC_MAXCWND(xprt)	((xprt)->max_reqs << RPC_CWNDSHIFT)
 
 #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd)
+
+/**
+ * xprt_register_transport - register a transport implementation
+ * @transport: transport to register
+ *
+ * If a transport implementation is loaded as a kernel module, it can
+ * call this interface to make itself known to the RPC client.
+ *
+ * Returns:
+ * 0:		transport successfully registered
+ * -EEXIST:	transport already registered
+ * -EINVAL:	transport module being unloaded
+ */
+int xprt_register_transport(struct xprt_class *transport)
+{
+	struct xprt_class *t;
+	int result;
+
+	result = -EEXIST;
+	spin_lock(&xprt_list_lock);
+	list_for_each_entry(t, &xprt_list, list) {
+		/* don't register the same transport class twice */
+		if (t->ident == transport->ident)
+			goto out;
+	}
+
+	result = -EINVAL;
+	if (try_module_get(THIS_MODULE)) {
+		list_add_tail(&transport->list, &xprt_list);
+		printk(KERN_INFO "RPC: Registered %s transport module.\n",
+			transport->name);
+		result = 0;
+	}
+
+out:
+	spin_unlock(&xprt_list_lock);
+	return result;
+}
+EXPORT_SYMBOL_GPL(xprt_register_transport);
+
+/**
+ * xprt_unregister_transport - unregister a transport implementation
+ * transport: transport to unregister
+ *
+ * Returns:
+ * 0:		transport successfully unregistered
+ * -ENOENT:	transport never registered
+ */
+int xprt_unregister_transport(struct xprt_class *transport)
+{
+	struct xprt_class *t;
+	int result;
+
+	result = 0;
+	spin_lock(&xprt_list_lock);
+	list_for_each_entry(t, &xprt_list, list) {
+		if (t == transport) {
+			printk(KERN_INFO
+				"RPC: Unregistered %s transport module.\n",
+				transport->name);
+			list_del_init(&transport->list);
+			module_put(THIS_MODULE);
+			goto out;
+		}
+	}
+	result = -ENOENT;
+
+out:
+	spin_unlock(&xprt_list_lock);
+	return result;
+}
+EXPORT_SYMBOL_GPL(xprt_unregister_transport);
 
 /**
  * xprt_reserve_xprt - serialize write access to transports
···
 		rpc_sleep_on(&xprt->sending, task, NULL, NULL);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(xprt_reserve_xprt);
 
 static void xprt_clear_locked(struct rpc_xprt *xprt)
 {
···
 		rpc_sleep_on(&xprt->sending, task, NULL, NULL);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong);
 
 static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task)
 {
···
 		__xprt_lock_write_next(xprt);
 	}
 }
+EXPORT_SYMBOL_GPL(xprt_release_xprt);
 
 /**
  * xprt_release_xprt_cong - allow other requests to use a transport
···
 		__xprt_lock_write_next_cong(xprt);
 	}
 }
+EXPORT_SYMBOL_GPL(xprt_release_xprt_cong);
 
 static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task)
 {
···
 {
 	__xprt_put_cong(task->tk_xprt, task->tk_rqstp);
 }
+EXPORT_SYMBOL_GPL(xprt_release_rqst_cong);
 
 /**
  * xprt_adjust_cwnd - adjust transport congestion window
···
 	xprt->cwnd = cwnd;
 	__xprt_put_cong(xprt, req);
 }
+EXPORT_SYMBOL_GPL(xprt_adjust_cwnd);
 
 /**
  * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue
···
 	else
 		rpc_wake_up(&xprt->pending);
 }
+EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks);
 
 /**
  * xprt_wait_for_buffer_space - wait for transport output buffer to clear
···
 	task->tk_timeout = req->rq_timeout;
 	rpc_sleep_on(&xprt->pending, task, NULL, NULL);
 }
+EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space);
 
 /**
  * xprt_write_space - wake the task waiting for transport output buffer space
···
 	}
 	spin_unlock_bh(&xprt->transport_lock);
 }
+EXPORT_SYMBOL_GPL(xprt_write_space);
 
 /**
  * xprt_set_retrans_timeout_def - set a request's retransmit timeout
···
 {
 	task->tk_timeout = task->tk_rqstp->rq_timeout;
 }
+EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def);
 
 /*
  * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout
···
 	if (task->tk_timeout > max_timeout || task->tk_timeout == 0)
 		task->tk_timeout = max_timeout;
 }
+EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt);
 
 static void xprt_reset_majortimeo(struct rpc_rqst *req)
 {
···
 	xprt_wake_pending_tasks(xprt, -ENOTCONN);
 	spin_unlock_bh(&xprt->transport_lock);
 }
+EXPORT_SYMBOL_GPL(xprt_disconnect);
 
 static void
 xprt_init_autodisconnect(unsigned long data)
···
 	xprt->stat.bad_xids++;
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(xprt_lookup_rqst);
 
 /**
  * xprt_update_rtt - update an RPC client's RTT state after receiving a reply
···
 		rpc_set_timeo(rtt, timer, req->rq_ntrans - 1);
 	}
 }
+EXPORT_SYMBOL_GPL(xprt_update_rtt);
 
 /**
  * xprt_complete_rqst - called when reply processing is complete
···
 	req->rq_received = req->rq_private_buf.len = copied;
 	rpc_wake_up_task(task);
 }
+EXPORT_SYMBOL_GPL(xprt_complete_rqst);
 
 static void xprt_timer(struct rpc_task *task)
 {
···
  * @args: rpc transport creation arguments
  *
  */
-struct rpc_xprt *xprt_create_transport(struct rpc_xprtsock_create *args)
+struct rpc_xprt *xprt_create_transport(struct xprt_create *args)
 {
 	struct rpc_xprt	*xprt;
 	struct rpc_rqst	*req;
+	struct xprt_class *t;
 
-	switch (args->proto) {
-	case IPPROTO_UDP:
-		xprt = xs_setup_udp(args);
-		break;
-	case IPPROTO_TCP:
-		xprt = xs_setup_tcp(args);
-		break;
-	default:
-		printk(KERN_ERR "RPC: unrecognized transport protocol: %d\n",
-				args->proto);
-		return ERR_PTR(-EIO);
+	spin_lock(&xprt_list_lock);
+	list_for_each_entry(t, &xprt_list, list) {
+		if (t->ident == args->ident) {
+			spin_unlock(&xprt_list_lock);
+			goto found;
+		}
 	}
+	spin_unlock(&xprt_list_lock);
+	printk(KERN_ERR "RPC: transport (%d) not supported\n", args->ident);
+	return ERR_PTR(-EIO);
+
+found:
+	xprt = t->setup(args);
 	if (IS_ERR(xprt)) {
 		dprintk("RPC:       xprt_create_transport: failed, %ld\n",
 				-PTR_ERR(xprt));

net/sunrpc/xprtrdma/Makefile

···
+obj-$(CONFIG_SUNRPC_XPRT_RDMA) += xprtrdma.o
+
+xprtrdma-y := transport.o rpc_rdma.o verbs.o

net/sunrpc/xprtrdma/rpc_rdma.c

···
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * rpc_rdma.c
+ *
+ * This file contains the guts of the RPC RDMA protocol, and
+ * does marshaling/unmarshaling, etc. It is also where interfacing
+ * to the Linux RPC framework lives.
+ */
+
+#include "xprt_rdma.h"
+
+#include <linux/highmem.h>
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+enum rpcrdma_chunktype {
+	rpcrdma_noch = 0,
+	rpcrdma_readch,
+	rpcrdma_areadch,
+	rpcrdma_writech,
+	rpcrdma_replych
+};
+
+#ifdef RPC_DEBUG
+static const char transfertypes[][12] = {
+	"pure inline",	/* no chunks */
+	" read chunk",	/* some argument via rdma read */
+	"*read chunk",	/* entire request via rdma read */
+	"write chunk",	/* some result via rdma write */
+	"reply chunk"	/* entire reply via rdma write */
+};
+#endif
+
+/*
+ * Chunk assembly from upper layer xdr_buf.
+ *
+ * Prepare the passed-in xdr_buf into representation as RPC/RDMA chunk
+ * elements. Segments are then coalesced when registered, if possible
+ * within the selected memreg mode.
+ *
+ * Note, this routine is never called if the connection's memory
+ * registration strategy is 0 (bounce buffers).
+ */
+
+static int
+rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, int pos,
+	enum rpcrdma_chunktype type, struct rpcrdma_mr_seg *seg, int nsegs)
+{
+	int len, n = 0, p;
+
+	if (pos == 0 && xdrbuf->head[0].iov_len) {
+		seg[n].mr_page = NULL;
+		seg[n].mr_offset = xdrbuf->head[0].iov_base;
+		seg[n].mr_len = xdrbuf->head[0].iov_len;
+		pos += xdrbuf->head[0].iov_len;
+		++n;
+	}
+
+	if (xdrbuf->page_len && (xdrbuf->pages[0] != NULL)) {
+		if (n == nsegs)
+			return 0;
+		seg[n].mr_page = xdrbuf->pages[0];
+		seg[n].mr_offset = (void *)(unsigned long) xdrbuf->page_base;
+		seg[n].mr_len = min_t(u32,
+			PAGE_SIZE - xdrbuf->page_base, xdrbuf->page_len);
+		len = xdrbuf->page_len - seg[n].mr_len;
+		pos += len;
+		++n;
+		p = 1;
+		while (len > 0) {
+			if (n == nsegs)
+				return 0;
+			seg[n].mr_page = xdrbuf->pages[p];
+			seg[n].mr_offset = NULL;
+			seg[n].mr_len = min_t(u32, PAGE_SIZE, len);
+			len -= seg[n].mr_len;
+			++n;
+			++p;
+		}
+	}
+
+	if (pos < xdrbuf->len && xdrbuf->tail[0].iov_len) {
+		if (n == nsegs)
+			return 0;
+		seg[n].mr_page = NULL;
+		seg[n].mr_offset = xdrbuf->tail[0].iov_base;
+		seg[n].mr_len = xdrbuf->tail[0].iov_len;
+		pos += xdrbuf->tail[0].iov_len;
+		++n;
+	}
+
+	if (pos < xdrbuf->len)
+		dprintk("RPC:       %s: marshaled only %d of %d\n",
+				__func__, pos, xdrbuf->len);
+
+	return n;
+}
+
+/*
+ * Create read/write chunk lists, and reply chunks, for RDMA
+ *
+ *   Assume check against THRESHOLD has been done, and chunks are required.
+ *   Assume only encoding one list entry for read|write chunks. The NFSv3
+ *     protocol is simple enough to allow this as it only has a single "bulk
+ *     result" in each procedure - complicated NFSv4 COMPOUNDs are not. (The
+ *     RDMA/Sessions NFSv4 proposal addresses this for future v4 revs.)
+ *
+ * When used for a single reply chunk (which is a special write
+ * chunk used for the entire reply, rather than just the data), it
+ * is used primarily for READDIR and READLINK which would otherwise
+ * be severely size-limited by a small rdma inline read max. The server
+ * response will come back as an RDMA Write, followed by a message
+ * of type RDMA_NOMSG carrying the xid and length. As a result, reply
+ * chunks do not provide data alignment, however they do not require
+ * "fixup" (moving the response to the upper layer buffer) either.
+ *
+ * Encoding key for single-list chunks (HLOO = Handle32 Length32 Offset64):
+ *
+ *  Read chunklist (a linked list):
+ *   N elements, position P (same P for all chunks of same arg!):
+ *    1 - PHLOO - 1 - PHLOO - ... - 1 - PHLOO - 0
+ *
+ *  Write chunklist (a list of (one) counted array):
+ *   N elements:
+ *    1 - N - HLOO - HLOO - ... - HLOO - 0
+ *
+ *  Reply chunk (a counted array):
+ *   N elements:
+ *    1 - N - HLOO - HLOO - ... - HLOO
+ */
+
+static unsigned int
+rpcrdma_create_chunks(struct rpc_rqst *rqst, struct xdr_buf *target,
+		struct rpcrdma_msg *headerp, enum rpcrdma_chunktype type)
+{
+	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_task->tk_xprt);
+	int nsegs, nchunks = 0;
+	int pos;
+	struct rpcrdma_mr_seg *seg = req->rl_segments;
+	struct rpcrdma_read_chunk *cur_rchunk = NULL;
+	struct rpcrdma_write_array *warray = NULL;
+	struct rpcrdma_write_chunk *cur_wchunk = NULL;
+	u32 *iptr = headerp->rm_body.rm_chunks;
+
+	if (type == rpcrdma_readch || type == rpcrdma_areadch) {
+		/* a read chunk - server will RDMA Read our memory */
+		cur_rchunk = (struct rpcrdma_read_chunk *) iptr;
+	} else {
+		/* a write or reply chunk - server will RDMA Write our memory */
+		*iptr++ = xdr_zero;	/* encode a NULL read chunk list */
+		if (type == rpcrdma_replych)
+			*iptr++ = xdr_zero;	/* a NULL write chunk list */
+		warray = (struct rpcrdma_write_array *) iptr;
+		cur_wchunk = (struct rpcrdma_write_chunk *) (warray + 1);
+	}
+
+	if (type == rpcrdma_replych || type == rpcrdma_areadch)
+		pos = 0;
+	else
+		pos = target->head[0].iov_len;
+
+	nsegs = rpcrdma_convert_iovs(target, pos, type, seg, RPCRDMA_MAX_SEGS);
+	if (nsegs == 0)
+		return 0;
+
+	do {
+		/* bind/register the memory, then build chunk from result. */
+		int n = rpcrdma_register_external(seg, nsegs,
+						cur_wchunk != NULL, r_xprt);
+		if (n <= 0)
+			goto out;
+		if (cur_rchunk) {	/* read */
+			cur_rchunk->rc_discrim = xdr_one;
+			/* all read chunks have the same "position" */
+			cur_rchunk->rc_position = htonl(pos);
+			cur_rchunk->rc_target.rs_handle = htonl(seg->mr_rkey);
+			cur_rchunk->rc_target.rs_length = htonl(seg->mr_len);
+			xdr_encode_hyper(
+					(u32 *)&cur_rchunk->rc_target.rs_offset,
+					seg->mr_base);
+			dprintk("RPC:       %s: read chunk "
+				"elem %d@0x%llx:0x%x pos %d (%s)\n", __func__,
+				seg->mr_len, seg->mr_base, seg->mr_rkey, pos,
+				n < nsegs ? "more" : "last");
+			cur_rchunk++;
+			r_xprt->rx_stats.read_chunk_count++;
+		} else {		/* write/reply */
+			cur_wchunk->wc_target.rs_handle = htonl(seg->mr_rkey);
+			cur_wchunk->wc_target.rs_length = htonl(seg->mr_len);
+			xdr_encode_hyper(
+					(u32 *)&cur_wchunk->wc_target.rs_offset,
+					seg->mr_base);
+			dprintk("RPC:       %s: %s chunk "
+				"elem %d@0x%llx:0x%x (%s)\n", __func__,
+				(type == rpcrdma_replych) ? "reply" : "write",
+				seg->mr_len, seg->mr_base, seg->mr_rkey,
+				n < nsegs ? "more" : "last");
+			cur_wchunk++;
+			if (type == rpcrdma_replych)
+				r_xprt->rx_stats.reply_chunk_count++;
+			else
+				r_xprt->rx_stats.write_chunk_count++;
+			r_xprt->rx_stats.total_rdma_request += seg->mr_len;
+		}
+		nchunks++;
+		seg   += n;
+		nsegs -= n;
+	} while (nsegs);
+
+	/* success. all failures return above */
+	req->rl_nchunks = nchunks;
+
+	BUG_ON(nchunks == 0);
+
+	/*
+	 * finish off header. If write, marshal discrim and nchunks.
+	 */
+	if (cur_rchunk) {
+		iptr = (u32 *) cur_rchunk;
+		*iptr++ = xdr_zero;	/* finish the read chunk list */
+		*iptr++ = xdr_zero;	/* encode a NULL write chunk list */
+		*iptr++ = xdr_zero;	/* encode a NULL reply chunk */
+	} else {
+		warray->wc_discrim = xdr_one;
+		warray->wc_nchunks = htonl(nchunks);
+		iptr = (u32 *) cur_wchunk;
+		if (type == rpcrdma_writech) {
+			*iptr++ = xdr_zero; /* finish the write chunk list */
+			*iptr++ = xdr_zero; /* encode a NULL reply chunk */
+		}
+	}
+
+	/*
+	 * Return header size.
+	 */
+	return (unsigned char *)iptr - (unsigned char *)headerp;
+
+out:
+	for (pos = 0; nchunks--;)
+		pos += rpcrdma_deregister_external(
+				&req->rl_segments[pos], r_xprt, NULL);
+	return 0;
+}
+
+/*
+ * Copy write data inline.
+ * This function is used for "small" requests. Data which is passed
+ * to RPC via iovecs (or page list) is copied directly into the
+ * pre-registered memory buffer for this request. For small amounts
+ * of data, this is efficient. The cutoff value is tunable.
+ */
+static int
+rpcrdma_inline_pullup(struct rpc_rqst *rqst, int pad)
+{
+	int i, npages, curlen;
+	int copy_len;
+	unsigned char *srcp, *destp;
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
+
+	destp = rqst->rq_svec[0].iov_base;
+	curlen = rqst->rq_svec[0].iov_len;
+	destp += curlen;
+	/*
+	 * Do optional padding where it makes sense. Alignment of write
+	 * payload can help the server, if our setting is accurate.
+	 */
+	pad -= (curlen + 36/*sizeof(struct rpcrdma_msg_padded)*/);
+	if (pad < 0 || rqst->rq_slen - curlen < RPCRDMA_INLINE_PAD_THRESH)
+		pad = 0;	/* don't pad this request */
+
+	dprintk("RPC:       %s: pad %d destp 0x%p len %d hdrlen %d\n",
+		__func__, pad, destp, rqst->rq_slen, curlen);
+
+	copy_len = rqst->rq_snd_buf.page_len;
+	r_xprt->rx_stats.pullup_copy_count += copy_len;
+	npages = PAGE_ALIGN(rqst->rq_snd_buf.page_base+copy_len) >> PAGE_SHIFT;
+	for (i = 0; copy_len && i < npages; i++) {
+		if (i == 0)
+			curlen = PAGE_SIZE - rqst->rq_snd_buf.page_base;
+		else
+			curlen = PAGE_SIZE;
+		if (curlen > copy_len)
+			curlen = copy_len;
+		dprintk("RPC:       %s: page %d destp 0x%p len %d curlen %d\n",
+			__func__, i, destp, copy_len, curlen);
+		srcp = kmap_atomic(rqst->rq_snd_buf.pages[i],
+					KM_SKB_SUNRPC_DATA);
+		if (i == 0)
+			memcpy(destp, srcp+rqst->rq_snd_buf.page_base, curlen);
+		else
+			memcpy(destp, srcp, curlen);
+		kunmap_atomic(srcp, KM_SKB_SUNRPC_DATA);
+		rqst->rq_svec[0].iov_len += curlen;
+		destp += curlen;
+		copy_len -= curlen;
+	}
+	if (rqst->rq_snd_buf.tail[0].iov_len) {
+		curlen = rqst->rq_snd_buf.tail[0].iov_len;
+		if (destp != rqst->rq_snd_buf.tail[0].iov_base) {
+			memcpy(destp,
+				rqst->rq_snd_buf.tail[0].iov_base, curlen);
+			r_xprt->rx_stats.pullup_copy_count += curlen;
+		}
+		dprintk("RPC:       %s: tail destp 0x%p len %d curlen %d\n",
+			__func__, destp, copy_len, curlen);
+		rqst->rq_svec[0].iov_len += curlen;
+	}
+	/* header now contains entire send message */
+	return pad;
+}
+
+/*
+ * Marshal a request: the primary job of this routine is to choose
+ * the transfer modes. See comments below.
+ *
+ * Uses multiple RDMA IOVs for a request:
+ *  [0] -- RPC RDMA header, which uses memory from the *start* of the
+ *         preregistered buffer that already holds the RPC data in
+ *         its middle.
+ *  [1] -- the RPC header/data, marshaled by RPC and the NFS protocol.
+ *  [2] -- optional padding.
+ *  [3] -- if padded, header only in [1] and data here.
+ */
+
+int
+rpcrdma_marshal_req(struct rpc_rqst *rqst)
+{
+	struct rpc_xprt *xprt = rqst->rq_task->tk_xprt;
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
+	char *base;
+	size_t hdrlen, rpclen, padlen;
+	enum rpcrdma_chunktype rtype, wtype;
+	struct rpcrdma_msg *headerp;
+
+	/*
+	 * rpclen gets amount of data in first buffer, which is the
+	 * pre-registered buffer.
+	 */
+	base = rqst->rq_svec[0].iov_base;
+	rpclen = rqst->rq_svec[0].iov_len;
+
+	/* build RDMA header in private area at front */
+	headerp = (struct rpcrdma_msg *) req->rl_base;
+	/* don't htonl XID, it's already done in request */
+	headerp->rm_xid = rqst->rq_xid;
+	headerp->rm_vers = xdr_one;
+	headerp->rm_credit = htonl(r_xprt->rx_buf.rb_max_requests);
+	headerp->rm_type = __constant_htonl(RDMA_MSG);
+
+	/*
+	 * Chunks needed for results?
+	 *
+	 * o If the expected result is under the inline threshold, all ops
+	 *   return as inline (but see later).
+	 * o Large non-read ops return as a single reply chunk.
+	 * o Large read ops return data as write chunk(s), header as inline.
+	 *
+	 * Note: the NFS code sending down multiple result segments implies
+	 * the op is one of read, readdir[plus], readlink or NFSv4 getacl.
+	 */
+
+	/*
+	 * This code can handle read chunks, write chunks OR reply
+	 * chunks -- only one type. If the request is too big to fit
+	 * inline, then we will choose read chunks. If the request is
+	 * a READ, then use write chunks to separate the file data
+	 * into pages; otherwise use reply chunks.
+	 */
+	if (rqst->rq_rcv_buf.buflen <= RPCRDMA_INLINE_READ_THRESHOLD(rqst))
+		wtype = rpcrdma_noch;
+	else if (rqst->rq_rcv_buf.page_len == 0)
+		wtype = rpcrdma_replych;
+	else if (rqst->rq_rcv_buf.flags & XDRBUF_READ)
+		wtype = rpcrdma_writech;
+	else
+		wtype = rpcrdma_replych;
+
+	/*
+	 * Chunks needed for arguments?
+	 *
+	 * o If the total request is under the inline threshold, all ops
+	 *   are sent as inline.
+	 * o Large non-write ops are sent with the entire message as a
+	 *   single read chunk (protocol 0-position special case).
+	 * o Large write ops transmit data as read chunk(s), header as
+	 *   inline.
+	 *
+	 * Note: the NFS code sending down multiple argument segments
+	 * implies the op is a write.
+	 * TBD check NFSv4 setacl
+	 */
+	if (rqst->rq_snd_buf.len <= RPCRDMA_INLINE_WRITE_THRESHOLD(rqst))
+		rtype = rpcrdma_noch;
+	else if (rqst->rq_snd_buf.page_len == 0)
+		rtype = rpcrdma_areadch;
+	else
+		rtype = rpcrdma_readch;
+
+	/* The following simplification is not true forever */
+	if (rtype != rpcrdma_noch && wtype == rpcrdma_replych)
+		wtype = rpcrdma_noch;
+	BUG_ON(rtype != rpcrdma_noch && wtype != rpcrdma_noch);
+
+	if (r_xprt->rx_ia.ri_memreg_strategy == RPCRDMA_BOUNCEBUFFERS &&
+	    (rtype != rpcrdma_noch || wtype != rpcrdma_noch)) {
+		/* forced to "pure inline"? */
+		dprintk("RPC:       %s: too much data (%d/%d) for inline\n",
+			__func__, rqst->rq_rcv_buf.len, rqst->rq_snd_buf.len);
+		return -1;
+	}
+
+	hdrlen = 28; /*sizeof *headerp;*/
+	padlen = 0;
+
+	/*
+	 * Pull up any extra send data into the preregistered buffer.
+	 * When padding is in use and applies to the transfer, insert
+	 * it and change the message type.
+	 */
+	if (rtype == rpcrdma_noch) {
+
+		padlen = rpcrdma_inline_pullup(rqst,
+						RPCRDMA_INLINE_PAD_VALUE(rqst));
+
+		if (padlen) {
+			headerp->rm_type = __constant_htonl(RDMA_MSGP);
+			headerp->rm_body.rm_padded.rm_align =
+				htonl(RPCRDMA_INLINE_PAD_VALUE(rqst));
+			headerp->rm_body.rm_padded.rm_thresh =
+				__constant_htonl(RPCRDMA_INLINE_PAD_THRESH);
+			headerp->rm_body.rm_padded.rm_pempty[0] = xdr_zero;
+			headerp->rm_body.rm_padded.rm_pempty[1] = xdr_zero;
+			headerp->rm_body.rm_padded.rm_pempty[2] = xdr_zero;
+			hdrlen += 2 * sizeof(u32); /* extra words in padhdr */
+			BUG_ON(wtype != rpcrdma_noch);
+
+		} else {
+			headerp->rm_body.rm_nochunks.rm_empty[0] = xdr_zero;
+			headerp->rm_body.rm_nochunks.rm_empty[1] = xdr_zero;
+			headerp->rm_body.rm_nochunks.rm_empty[2] = xdr_zero;
+			/* new length after pullup */
+			rpclen = rqst->rq_svec[0].iov_len;
+			/*
+			 * Currently we try to not actually use read inline.
+			 * Reply chunks have the desirable property that
+			 * they land, packed, directly in the target buffers
+			 * without headers, so they require no fixup. The
+			 * additional RDMA Write op sends the same amount
+			 * of data, streams on-the-wire and adds no overhead
+			 * on receive. Therefore, we request a reply chunk
+			 * for non-writes wherever feasible and efficient.
+			 */
+			if (wtype == rpcrdma_noch &&
+			    r_xprt->rx_ia.ri_memreg_strategy > RPCRDMA_REGISTER)
+				wtype = rpcrdma_replych;
+		}
+	}
+
+	/*
+	 * Marshal chunks. This routine will return the header length
+	 * consumed by marshaling.
+	 */
+	if (rtype != rpcrdma_noch) {
+		hdrlen = rpcrdma_create_chunks(rqst,
+					&rqst->rq_snd_buf, headerp, rtype);
+		wtype = rtype;	/* simplify dprintk */
+
+	} else if (wtype != rpcrdma_noch) {
+		hdrlen = rpcrdma_create_chunks(rqst,
+					&rqst->rq_rcv_buf, headerp, wtype);
+	}
+
+	if (hdrlen == 0)
+		return -1;
+
+	dprintk("RPC:       %s: %s: hdrlen %zd rpclen %zd padlen %zd\n"
+		"                   headerp 0x%p base 0x%p lkey 0x%x\n",
+		__func__, transfertypes[wtype], hdrlen, rpclen, padlen,
+		headerp, base, req->rl_iov.lkey);
+
+	/*
+	 * initialize send_iov's - normally only two: rdma chunk header and
+	 * single preregistered RPC header buffer, but if padding is present,
+	 * then use a preregistered (and zeroed) pad buffer between the RPC
+	 * header and any write data. In all non-rdma cases, any following
+	 * data has been copied into the RPC header buffer.
+	 */
+	req->rl_send_iov[0].addr = req->rl_iov.addr;
+	req->rl_send_iov[0].length = hdrlen;
+	req->rl_send_iov[0].lkey = req->rl_iov.lkey;
+
+	req->rl_send_iov[1].addr = req->rl_iov.addr + (base - req->rl_base);
+	req->rl_send_iov[1].length = rpclen;
+	req->rl_send_iov[1].lkey = req->rl_iov.lkey;
+
+	req->rl_niovs = 2;
+
+	if (padlen) {
+		struct rpcrdma_ep *ep = &r_xprt->rx_ep;
+
+		req->rl_send_iov[2].addr = ep->rep_pad.addr;
+		req->rl_send_iov[2].length = padlen;
+		req->rl_send_iov[2].lkey = ep->rep_pad.lkey;
+
+		req->rl_send_iov[3].addr = req->rl_send_iov[1].addr + rpclen;
+		req->rl_send_iov[3].length = rqst->rq_slen - rpclen;
+		req->rl_send_iov[3].lkey = req->rl_iov.lkey;
+
+		req->rl_niovs = 4;
+	}
+
+	return 0;
+}
+
+/*
+ * Chase down a received write or reply chunklist to get length
+ * RDMA'd by server. See map at rpcrdma_create_chunks()! :-)
+ */
+static int
+rpcrdma_count_chunks(struct rpcrdma_rep *rep, int max, int wrchunk, u32 **iptrp)
+{
+	unsigned int i, total_len;
+	struct rpcrdma_write_chunk *cur_wchunk;
+
+	i = ntohl(**iptrp);	/* get array count */
+	if (i > max)
+		return -1;
+	cur_wchunk = (struct rpcrdma_write_chunk *) (*iptrp + 1);
+	total_len = 0;
+	while (i--) {
+		struct rpcrdma_segment *seg = &cur_wchunk->wc_target;
+		ifdebug(FACILITY) {
+			u64 off;
+			xdr_decode_hyper((u32 *)&seg->rs_offset, &off);
+			dprintk("RPC:       %s: chunk %d@0x%llx:0x%x\n",
+				__func__,
+				ntohl(seg->rs_length),
+				off,
+				ntohl(seg->rs_handle));
+		}
+		total_len += ntohl(seg->rs_length);
+		++cur_wchunk;
+	}
+	/* check and adjust for properly terminated write chunk */
+	if (wrchunk) {
+		u32 *w = (u32 *) cur_wchunk;
+		if (*w++ != xdr_zero)
+			return -1;
+		cur_wchunk = (struct rpcrdma_write_chunk *) w;
+	}
+	if ((char *) cur_wchunk > rep->rr_base + rep->rr_len)
+		return -1;
+
+	*iptrp = (u32 *) cur_wchunk;
+	return total_len;
+}
+
+/*
+ * Scatter inline received data back into provided iov's.
+ */
+static void
+rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len)
+{
+	int i, npages, curlen, olen;
+	char *destp;
+
+	curlen = rqst->rq_rcv_buf.head[0].iov_len;
+	if (curlen > copy_len) {	/* write chunk header fixup */
+		curlen = copy_len;
+		rqst->rq_rcv_buf.head[0].iov_len = curlen;
+	}
+
+	dprintk("RPC:       %s: srcp 0x%p len %d hdrlen %d\n",
+		__func__, srcp, copy_len, curlen);
+
+	/* Shift pointer for first receive segment only */
+	rqst->rq_rcv_buf.head[0].iov_base = srcp;
+	srcp += curlen;
+	copy_len -= curlen;
+
+	olen = copy_len;
+	i = 0;
+	rpcx_to_rdmax(rqst->rq_xprt)->rx_stats.fixup_copy_count += olen;
+	if (copy_len && rqst->rq_rcv_buf.page_len) {
+		npages = PAGE_ALIGN(rqst->rq_rcv_buf.page_base +
+			rqst->rq_rcv_buf.page_len) >> PAGE_SHIFT;
+		for (; i < npages; i++) {
+			if (i == 0)
+				curlen = PAGE_SIZE - rqst->rq_rcv_buf.page_base;
+			else
+				curlen = PAGE_SIZE;
+			if (curlen > copy_len)
+				curlen = copy_len;
+			dprintk("RPC:       %s: page %d"
+				" srcp 0x%p len %d curlen %d\n",
+				__func__, i, srcp, copy_len, curlen);
+			destp = kmap_atomic(rqst->rq_rcv_buf.pages[i],
+						KM_SKB_SUNRPC_DATA);
+			if (i == 0)
+				memcpy(destp + rqst->rq_rcv_buf.page_base,
+						srcp, curlen);
+			else
+				memcpy(destp, srcp, curlen);
+			flush_dcache_page(rqst->rq_rcv_buf.pages[i]);
+			kunmap_atomic(destp, KM_SKB_SUNRPC_DATA);
+			srcp += curlen;
+			copy_len -= curlen;
+			if (copy_len == 0)
+				break;
+		}
+		rqst->rq_rcv_buf.page_len = olen - copy_len;
+	} else
+		rqst->rq_rcv_buf.page_len = 0;
+
+	if (copy_len && rqst->rq_rcv_buf.tail[0].iov_len) {
+		curlen = copy_len;
+		if (curlen > rqst->rq_rcv_buf.tail[0].iov_len)
+			curlen = rqst->rq_rcv_buf.tail[0].iov_len;
+		if (rqst->rq_rcv_buf.tail[0].iov_base != srcp)
+			memcpy(rqst->rq_rcv_buf.tail[0].iov_base, srcp, curlen);
+		dprintk("RPC:       %s: tail srcp 0x%p len %d curlen %d\n",
+			__func__, srcp, copy_len, curlen);
+		rqst->rq_rcv_buf.tail[0].iov_len = curlen;
+		copy_len -= curlen; ++i;
+	} else
+		rqst->rq_rcv_buf.tail[0].iov_len = 0;
+
+	if (copy_len)
+		dprintk("RPC:       %s: %d bytes in"
+			" %d extra segments (%d lost)\n",
+			__func__, olen, i, copy_len);
+
+	/* TBD avoid a warning from call_decode() */
+	rqst->rq_private_buf = rqst->rq_rcv_buf;
+}
+
+/*
+ * This function is called when an async event is posted to
+ * the connection which changes the connection state. All it
+ * does at this point is mark the connection up/down, the rpc
+ * timers do the rest.
+ */
+void
+rpcrdma_conn_func(struct rpcrdma_ep *ep)
+{
+	struct rpc_xprt *xprt = ep->rep_xprt;
+
+	spin_lock_bh(&xprt->transport_lock);
+	if (ep->rep_connected > 0) {
+		if (!xprt_test_and_set_connected(xprt))
+			xprt_wake_pending_tasks(xprt, 0);
+	} else {
+		if (xprt_test_and_clear_connected(xprt))
+			xprt_wake_pending_tasks(xprt, ep->rep_connected);
+	}
+	spin_unlock_bh(&xprt->transport_lock);
+}
+
+/*
+ * This function is called when memory window unbind which we are waiting
+ * for completes. Just use rr_func (zeroed by upcall) to signal completion.
+ */
+static void
+rpcrdma_unbind_func(struct rpcrdma_rep *rep)
+{
+	wake_up(&rep->rr_unbind);
+}
+
+/*
+ * Called as a tasklet to do req/reply match and complete a request
+ * Errors must result in the RPC task either being awakened, or
+ * allowed to timeout, to discover the errors at that time.
+ */
+void
+rpcrdma_reply_handler(struct rpcrdma_rep *rep)
+{
+	struct rpcrdma_msg *headerp;
+	struct rpcrdma_req *req;
+	struct rpc_rqst *rqst;
+	struct rpc_xprt *xprt = rep->rr_xprt;
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	u32 *iptr;
+	int i, rdmalen, status;
+
+	/* Check status. If bad, signal disconnect and return rep to pool */
+	if (rep->rr_len == ~0U) {
+		rpcrdma_recv_buffer_put(rep);
+		if (r_xprt->rx_ep.rep_connected == 1) {
+			r_xprt->rx_ep.rep_connected = -EIO;
+			rpcrdma_conn_func(&r_xprt->rx_ep);
+		}
+		return;
+	}
+	if (rep->rr_len < 28) {
+		dprintk("RPC:       %s: short/invalid reply\n", __func__);
+		goto repost;
+	}
+	headerp = (struct rpcrdma_msg *) rep->rr_base;
+	if (headerp->rm_vers != xdr_one) {
+		dprintk("RPC:       %s: invalid version %d\n",
+			__func__, ntohl(headerp->rm_vers));
+		goto repost;
+	}
+
+	/* Get XID and try for a match. */
+	spin_lock(&xprt->transport_lock);
+	rqst = xprt_lookup_rqst(xprt, headerp->rm_xid);
+	if (rqst == NULL) {
+		spin_unlock(&xprt->transport_lock);
+		dprintk("RPC:       %s: reply 0x%p failed "
+			"to match any request xid 0x%08x len %d\n",
+			__func__, rep, headerp->rm_xid, rep->rr_len);
+repost:
+		r_xprt->rx_stats.bad_reply_count++;
+		rep->rr_func = rpcrdma_reply_handler;
+		if (rpcrdma_ep_post_recv(&r_xprt->rx_ia, &r_xprt->rx_ep, rep))
+			rpcrdma_recv_buffer_put(rep);
+
+		return;
+	}
+
+	/* get request object */
+	req = rpcr_to_rdmar(rqst);
+
+	dprintk("RPC:       %s: reply 0x%p completes request 0x%p\n"
+		"                   RPC request 0x%p xid 0x%08x\n",
+			__func__, rep, req, rqst, headerp->rm_xid);
+
+	BUG_ON(!req || req->rl_reply);
+
+	/* from here on, the reply is no longer an orphan */
+	req->rl_reply = rep;
+
+	/* check for expected message types */
+	/* The order of some of these tests is important. */
+	switch (headerp->rm_type) {
+	case __constant_htonl(RDMA_MSG):
+		/* never expect read chunks */
+		/* never expect reply chunks (two ways to check) */
+		/* never expect write chunks without having offered RDMA */
+		if (headerp->rm_body.rm_chunks[0] != xdr_zero ||
+		    (headerp->rm_body.rm_chunks[1] == xdr_zero &&
+		     headerp->rm_body.rm_chunks[2] != xdr_zero) ||
+		    (headerp->rm_body.rm_chunks[1] != xdr_zero &&
+		     req->rl_nchunks == 0))
+			goto badheader;
+		if (headerp->rm_body.rm_chunks[1] != xdr_zero) {
+			/* count any expected write chunks in read reply */
+			/* start at write chunk array count */
+			iptr = &headerp->rm_body.rm_chunks[2];
+			rdmalen = rpcrdma_count_chunks(rep,
+						req->rl_nchunks, 1, &iptr);
+			/* check for validity, and no reply chunk after */
+			if (rdmalen < 0 || *iptr++ != xdr_zero)
+				goto badheader;
+			rep->rr_len -=
+			    ((unsigned char *)iptr - (unsigned char *)headerp);
+			status = rep->rr_len + rdmalen;
+			r_xprt->rx_stats.total_rdma_reply += rdmalen;
+		} else {
+			/* else ordinary inline */
+			iptr = (u32 *)((unsigned char *)headerp + 28);
+			rep->rr_len -= 28; /*sizeof *headerp;*/
+			status = rep->rr_len;
+		}
+		/* Fix up the rpc results for upper layer */
+		rpcrdma_inline_fixup(rqst, (char *)iptr, rep->rr_len);
+		break;
+
+	case __constant_htonl(RDMA_NOMSG):
+		/* never expect read or write chunks, always reply chunks */
+		if (headerp->rm_body.rm_chunks[0] != xdr_zero ||
+		    headerp->rm_body.rm_chunks[1] != xdr_zero ||
+		    headerp->rm_body.rm_chunks[2] != xdr_one ||
+		    req->rl_nchunks == 0)
+			goto badheader;
+		iptr = (u32 *)((unsigned char *)headerp + 28);
+		rdmalen = rpcrdma_count_chunks(rep, req->rl_nchunks, 0, &iptr);
+		if (rdmalen < 0)
+			goto badheader;
+		r_xprt->rx_stats.total_rdma_reply += rdmalen;
+		/* Reply chunk buffer already is the reply vector - no fixup. */
+		status = rdmalen;
+		break;
+
+badheader:
+	default:
+		dprintk("%s: invalid rpcrdma reply header (type %d):"
+				" chunks[012] == %d %d %d"
+				" expected chunks <= %d\n",
+				__func__, ntohl(headerp->rm_type),
+				headerp->rm_body.rm_chunks[0],
+				headerp->rm_body.rm_chunks[1],
+				headerp->rm_body.rm_chunks[2],
+				req->rl_nchunks);
+		status = -EIO;
+		r_xprt->rx_stats.bad_reply_count++;
+		break;
+	}
+
+	/* If using mw bind, start the deregister process now. */
+	/* (Note: if mr_free(), cannot perform it here, in tasklet context) */
+	if (req->rl_nchunks) switch (r_xprt->rx_ia.ri_memreg_strategy) {
+	case RPCRDMA_MEMWINDOWS:
+		for (i = 0; req->rl_nchunks-- > 1;)
+			i += rpcrdma_deregister_external(
+				&req->rl_segments[i], r_xprt, NULL);
+		/* Optionally wait (not here) for unbinds to complete */
+		rep->rr_func = rpcrdma_unbind_func;
+		(void) rpcrdma_deregister_external(&req->rl_segments[i],
+						   r_xprt, rep);
+		break;
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+		for (i = 0; req->rl_nchunks--;)
+			i += rpcrdma_deregister_external(&req->rl_segments[i],
+							 r_xprt, NULL);
+		break;
+	default:
+		break;
+	}
+
+	dprintk("RPC:       %s: xprt_complete_rqst(0x%p, 0x%p, %d)\n",
+			__func__, xprt, rqst, status);
+	xprt_complete_rqst(rqst->rq_task, status);
+	spin_unlock(&xprt->transport_lock);
+}

net/sunrpc/xprtrdma/transport.c

···
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * transport.c
+ *
+ * This file contains the top-level implementation of an RPC RDMA
+ * transport.
+ *
+ * Naming convention: functions beginning with xprt_ are part of the
+ * transport switch. All others are RPC RDMA internal.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+
+#include "xprt_rdma.h"
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+MODULE_LICENSE("Dual BSD/GPL");
+
+MODULE_DESCRIPTION("RPC/RDMA Transport for Linux kernel NFS");
+MODULE_AUTHOR("Network Appliance, Inc.");
+
+/*
+ * tunables
+ */
+
+static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
+static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
+static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
+static unsigned int xprt_rdma_inline_write_padding;
+#if !RPCRDMA_PERSISTENT_REGISTRATION
+static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_REGISTER; /* FMR? */
+#else
+static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_ALLPHYSICAL;
+#endif
+
+#ifdef RPC_DEBUG
+
+static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE;
+static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE;
+static unsigned int zero;
+static unsigned int max_padding = PAGE_SIZE;
+static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
+static unsigned int max_memreg = RPCRDMA_LAST - 1;
+
+static struct ctl_table_header *sunrpc_table_header;
+
+static ctl_table xr_tunables_table[] = {
+	{
+		.ctl_name	= CTL_SLOTTABLE_RDMA,
+		.procname	= "rdma_slot_table_entries",
+		.data		= &xprt_rdma_slot_table_entries,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &min_slot_table_size,
+		.extra2		= &max_slot_table_size
+	},
+	{
+		.ctl_name	= CTL_RDMA_MAXINLINEREAD,
+		.procname	= "rdma_max_inline_read",
+		.data		= &xprt_rdma_max_inline_read,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+		.strategy	= &sysctl_intvec,
+	},
+	{
+		.ctl_name	= CTL_RDMA_MAXINLINEWRITE,
+		.procname	= "rdma_max_inline_write",
+		.data		= &xprt_rdma_max_inline_write,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+		.strategy	= &sysctl_intvec,
+	},
+	{
+		.ctl_name	= CTL_RDMA_WRITEPADDING,
+		.procname	= "rdma_inline_write_padding",
+		.data		= &xprt_rdma_inline_write_padding,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &zero,
+		.extra2		= &max_padding,
+	},
+	{
+		.ctl_name	= CTL_RDMA_MEMREG,
+		.procname	= "rdma_memreg_strategy",
+		.data		= &xprt_rdma_memreg_strategy,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &min_memreg,
+		.extra2		= &max_memreg,
+	},
+	{
+		.ctl_name = 0,
+	},
+};
+
+static ctl_table sunrpc_table[] = {
+	{
+		.ctl_name	= CTL_SUNRPC,
+		.procname	= "sunrpc",
+		.mode		= 0555,
+		.child		= xr_tunables_table
+	},
+	{
+		.ctl_name = 0,
+	},
+};
+
+#endif
+
+static struct rpc_xprt_ops xprt_rdma_procs;	/* forward reference */
+
+static void
+xprt_rdma_format_addresses(struct rpc_xprt *xprt)
+{
+	struct sockaddr_in *addr = (struct sockaddr_in *)
+					&rpcx_to_rdmad(xprt).addr;
+	char *buf;
+
+	buf = kzalloc(20, GFP_KERNEL);
+	if (buf)
+		snprintf(buf, 20, NIPQUAD_FMT, NIPQUAD(addr->sin_addr.s_addr));
+	xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
+
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf)
+		snprintf(buf, 8, "%u", ntohs(addr->sin_port));
+	xprt->address_strings[RPC_DISPLAY_PORT] = buf;
+
+	xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
+
+	buf = kzalloc(48, GFP_KERNEL);
+	if (buf)
+		snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
+			NIPQUAD(addr->sin_addr.s_addr),
+			ntohs(addr->sin_port), "rdma");
+	xprt->address_strings[RPC_DISPLAY_ALL] = buf;
+
+	buf = kzalloc(10, GFP_KERNEL);
+	if (buf)
+		snprintf(buf, 10, "%02x%02x%02x%02x",
+			NIPQUAD(addr->sin_addr.s_addr));
+	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
+
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf)
+		snprintf(buf, 8, "%4hx", ntohs(addr->sin_port));
+	xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
+
+	buf = kzalloc(30, GFP_KERNEL);
+	if (buf)
+		snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
+			NIPQUAD(addr->sin_addr.s_addr),
+			ntohs(addr->sin_port) >> 8,
+			ntohs(addr->sin_port) & 0xff);
+	xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
+
+	/* netid */
+	xprt->address_strings[RPC_DISPLAY_NETID] = "rdma";
+}
+
+static void
+xprt_rdma_free_addresses(struct rpc_xprt *xprt)
+{
+	kfree(xprt->address_strings[RPC_DISPLAY_ADDR]);
+	kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
+	kfree(xprt->address_strings[RPC_DISPLAY_ALL]);
+	kfree(xprt->address_strings[RPC_DISPLAY_HEX_ADDR]);
+	kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
+	kfree(xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR]);
+}
+
+static void
+xprt_rdma_connect_worker(struct work_struct *work)
+{
+	struct rpcrdma_xprt *r_xprt =
+		container_of(work, struct rpcrdma_xprt, rdma_connect.work);
+	struct rpc_xprt *xprt = &r_xprt->xprt;
+	int rc = 0;
+
+	if (!xprt->shutdown) {
+		xprt_clear_connected(xprt);
+
+		dprintk("RPC:       %s: %sconnect\n", __func__,
+				r_xprt->rx_ep.rep_connected != 0 ? "re" : "");
+		rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
+		if (rc)
+			goto out;
+	}
+	goto out_clear;
+
+out:
+	xprt_wake_pending_tasks(xprt, rc);
+
+out_clear:
+	dprintk("RPC:       %s: exit\n", __func__);
+	xprt_clear_connecting(xprt);
+}
+
+/*
+ * xprt_rdma_destroy
+ *
+ * Destroy the xprt.
+ * Free all memory associated with the object, including its own.
+ * NOTE: none of the *destroy methods free memory for their top-level
+ * objects, even though they may have allocated it (they do free
+ * private memory). It's up to the caller to handle it. In this
+ * case (RDMA transport), all structure memory is inlined with the
+ * struct rpcrdma_xprt.
+ */
+static void
+xprt_rdma_destroy(struct rpc_xprt *xprt)
+{
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	int rc;
+
+	dprintk("RPC:       %s: called\n", __func__);
+
+	cancel_delayed_work(&r_xprt->rdma_connect);
+	flush_scheduled_work();
+
+	xprt_clear_connected(xprt);
+
+	rpcrdma_buffer_destroy(&r_xprt->rx_buf);
+	rc = rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
+	if (rc)
+		dprintk("RPC:       %s: rpcrdma_ep_destroy returned %i\n",
+			__func__, rc);
+	rpcrdma_ia_close(&r_xprt->rx_ia);
+
+	xprt_rdma_free_addresses(xprt);
+
+	kfree(xprt->slot);
+	xprt->slot = NULL;
+	kfree(xprt);
+
+	dprintk("RPC:       %s: returning\n", __func__);
+
+	module_put(THIS_MODULE);
+}
+
+/**
+ * xprt_setup_rdma - Set up transport to use RDMA
+ *
+ * @args: rpc transport arguments
+ */
+static struct rpc_xprt *
+xprt_setup_rdma(struct xprt_create *args)
+{
+	struct rpcrdma_create_data_internal cdata;
+	struct rpc_xprt *xprt;
+	struct rpcrdma_xprt *new_xprt;
+	struct rpcrdma_ep *new_ep;
+	struct sockaddr_in *sin;
+	int rc;
+
+	if (args->addrlen > sizeof(xprt->addr)) {
+		dprintk("RPC:       %s: address too large\n", __func__);
+		return ERR_PTR(-EBADF);
+	}
+
+	xprt = kzalloc(sizeof(struct rpcrdma_xprt), GFP_KERNEL);
+	if (xprt == NULL) {
+		dprintk("RPC:       %s: couldn't allocate rpcrdma_xprt\n",
+			__func__);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	xprt->max_reqs = xprt_rdma_slot_table_entries;
+	xprt->slot = kcalloc(xprt->max_reqs,
+				sizeof(struct rpc_rqst), GFP_KERNEL);
+	if (xprt->slot == NULL) {
+		kfree(xprt);
+		dprintk("RPC:       %s: couldn't allocate %d slots\n",
+			__func__, xprt->max_reqs);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	/* 60 second timeout, no retries */
+	xprt_set_timeout(&xprt->timeout, 0, 60UL * HZ);
+	xprt->bind_timeout = (60U * HZ);
+	xprt->connect_timeout = (60U * HZ);
+	xprt->reestablish_timeout = (5U * HZ);
+	xprt->idle_timeout = (5U * 60 * HZ);
+
+	xprt->resvport = 0;		/* privileged port not needed */
+	xprt->tsh_size = 0;		/* RPC-RDMA handles framing */
+	xprt->max_payload = RPCRDMA_MAX_DATA_SEGS * PAGE_SIZE;
+	xprt->ops = &xprt_rdma_procs;
+
+	/*
+	 * Set up RDMA-specific connect data.
+	 */
+
+	/* Put server RDMA address in local cdata */
+	memcpy(&cdata.addr, args->dstaddr, args->addrlen);
+
+	/* Ensure xprt->addr holds valid server TCP (not RDMA)
+	 * address, for any side protocols which peek at it */
+	xprt->prot = IPPROTO_TCP;
+	xprt->addrlen = args->addrlen;
+	memcpy(&xprt->addr, &cdata.addr, xprt->addrlen);
+
+	sin = (struct sockaddr_in *)&cdata.addr;
+	if (ntohs(sin->sin_port) != 0)
+		xprt_set_bound(xprt);
+
+	dprintk("RPC:       %s: %u.%u.%u.%u:%u\n", __func__,
+			NIPQUAD(sin->sin_addr.s_addr), ntohs(sin->sin_port));
+
+	/* Set max requests */
+	cdata.max_requests = xprt->max_reqs;
+
+	/* Set some length limits */
+	cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
+	cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
+
+	cdata.inline_wsize = xprt_rdma_max_inline_write;
+	if (cdata.inline_wsize > cdata.wsize)
+		cdata.inline_wsize = cdata.wsize;
+
+	cdata.inline_rsize = xprt_rdma_max_inline_read;
+	if (cdata.inline_rsize > cdata.rsize)
+		cdata.inline_rsize = cdata.rsize;
+
+	cdata.padding = xprt_rdma_inline_write_padding;
+
+	/*
+	 * Create new transport instance, which includes initialized
+	 *  o ia
+	 *  o endpoint
+	 *  o buffers
+	 */
+
+	new_xprt = rpcx_to_rdmax(xprt);
+
+	rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr,
+				xprt_rdma_memreg_strategy);
+	if (rc)
+		goto out1;
+
+	/*
+	 * initialize and create ep
+	 */
+	new_xprt->rx_data = cdata;
+	new_ep = &new_xprt->rx_ep;
+	new_ep->rep_remote_addr = cdata.addr;
+
+	rc = rpcrdma_ep_create(&new_xprt->rx_ep,
+				&new_xprt->rx_ia, &new_xprt->rx_data);
+	if (rc)
+		goto out2;
+
+	/*
+	 * Allocate pre-registered send and receive buffers for headers and
+	 * any inline data. Also specify any padding which will be provided
+	 * from a preregistered zero buffer.
+	 */
+	rc = rpcrdma_buffer_create(&new_xprt->rx_buf, new_ep, &new_xprt->rx_ia,
+				&new_xprt->rx_data);
+	if (rc)
+		goto out3;
+
+	/*
+	 * Register a callback for connection events. This is necessary because
+	 * connection loss notification is async. We also catch connection loss
+	 * when reaping receives.
+	 */
+	INIT_DELAYED_WORK(&new_xprt->rdma_connect, xprt_rdma_connect_worker);
+	new_ep->rep_func = rpcrdma_conn_func;
+	new_ep->rep_xprt = xprt;
+
+	xprt_rdma_format_addresses(xprt);
+
+	if (!try_module_get(THIS_MODULE))
+		goto out4;
+
+	return xprt;
+
+out4:
+	xprt_rdma_free_addresses(xprt);
+	rc = -EINVAL;
+out3:
+	(void) rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
+out2:
+	rpcrdma_ia_close(&new_xprt->rx_ia);
+out1:
+	kfree(xprt->slot);
+	kfree(xprt);
+	return ERR_PTR(rc);
+}
+
+/*
+ * Close a connection, during shutdown or timeout/reconnect
+ */
+static void
+xprt_rdma_close(struct rpc_xprt *xprt)
+{
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+
+	dprintk("RPC:       %s: closing\n", __func__);
+	xprt_disconnect(xprt);
+	(void) rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia);
+}
+
+static void
+xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
+{
+	struct sockaddr_in *sap;
+
+	sap = (struct sockaddr_in *)&xprt->addr;
+	sap->sin_port = htons(port);
+	sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr;
+	sap->sin_port = htons(port);
+	dprintk("RPC:       %s: %u\n", __func__, port);
+}
+
+static void
+xprt_rdma_connect(struct rpc_task *task)
+{
+	struct rpc_xprt *xprt = (struct rpc_xprt *)task->tk_xprt;
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+
+	if (!xprt_test_and_set_connecting(xprt)) {
+		if (r_xprt->rx_ep.rep_connected != 0) {
+			/* Reconnect */
+			schedule_delayed_work(&r_xprt->rdma_connect,
+				xprt->reestablish_timeout);
+		} else {
+			schedule_delayed_work(&r_xprt->rdma_connect, 0);
+			if (!RPC_IS_ASYNC(task))
+				flush_scheduled_work();
+		}
+	}
+}
+
+static int
+xprt_rdma_reserve_xprt(struct rpc_task *task)
+{
+	struct rpc_xprt *xprt = task->tk_xprt;
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	int credits = atomic_read(&r_xprt->rx_buf.rb_credits);
+
+	/* == RPC_CWNDSCALE @ init, but *after* setup */
+	if (r_xprt->rx_buf.rb_cwndscale == 0UL) {
+		r_xprt->rx_buf.rb_cwndscale = xprt->cwnd;
+		dprintk("RPC:       %s: cwndscale %lu\n", __func__,
+			r_xprt->rx_buf.rb_cwndscale);
+		BUG_ON(r_xprt->rx_buf.rb_cwndscale <= 0);
+	}
+	xprt->cwnd = credits * r_xprt->rx_buf.rb_cwndscale;
+	return xprt_reserve_xprt_cong(task);
+}
+
+/*
+ * The RDMA allocate/free functions need the task structure as a place
+ * to hide the struct rpcrdma_req, which is necessary for the actual send/recv
+ * sequence. For this reason, the recv buffers are attached to send
+ * buffers for portions of the RPC. Note that the RPC layer allocates
+ * both send and receive buffers in the same call. We may register
+ * the receive buffer portion when using reply chunks.
+ */
+static void *
+xprt_rdma_allocate(struct rpc_task *task, size_t size)
+{
+	struct rpc_xprt *xprt = task->tk_xprt;
+	struct rpcrdma_req *req, *nreq;
+
+	req = rpcrdma_buffer_get(&rpcx_to_rdmax(xprt)->rx_buf);
+	BUG_ON(NULL == req);
+
+	if (size > req->rl_size) {
+		dprintk("RPC:       %s: size %zd too large for buffer[%zd]: "
+			"prog %d vers %d proc %d\n",
+			__func__, size, req->rl_size,
+			task->tk_client->cl_prog, task->tk_client->cl_vers,
+			task->tk_msg.rpc_proc->p_proc);
+		/*
+		 * Outgoing length shortage. Our inline write max must have
+		 * been configured to perform direct i/o.
+		 *
+		 * This is therefore a large metadata operation, and the
+		 * allocate call was made on the maximum possible message,
+		 * e.g. containing long filename(s) or symlink data. In
+		 * fact, while these metadata operations *might* carry
+		 * large outgoing payloads, they rarely *do*. However, we
+		 * have to commit to the request here, so reallocate and
+		 * register it now. The data path will never require this
+		 * reallocation.
+		 *
+		 * If the allocation or registration fails, the RPC framework
+		 * will (doggedly) retry.
+		 */
+		if (rpcx_to_rdmax(xprt)->rx_ia.ri_memreg_strategy ==
+				RPCRDMA_BOUNCEBUFFERS) {
+			/* forced to "pure inline" */
+			dprintk("RPC:       %s: too much data (%zd) for inline "
+					"(r/w max %d/%d)\n", __func__, size,
+					rpcx_to_rdmad(xprt).inline_rsize,
+					rpcx_to_rdmad(xprt).inline_wsize);
+			size = req->rl_size;
+			rpc_exit(task, -EIO);		/* fail the operation */
+			rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++;
+			goto out;
+		}
+		if (task->tk_flags & RPC_TASK_SWAPPER)
+			nreq = kmalloc(sizeof *req + size, GFP_ATOMIC);
+		else
+			nreq = kmalloc(sizeof *req + size, GFP_NOFS);
+		if (nreq == NULL)
+			goto outfail;
+
+		if (rpcrdma_register_internal(&rpcx_to_rdmax(xprt)->rx_ia,
+				nreq->rl_base, size + sizeof(struct rpcrdma_req)
+				- offsetof(struct rpcrdma_req, rl_base),
+				&nreq->rl_handle, &nreq->rl_iov)) {
+			kfree(nreq);
+			goto outfail;
+		}
+		rpcx_to_rdmax(xprt)->rx_stats.hardway_register_count += size;
+		nreq->rl_size = size;
+		nreq->rl_niovs = 0;
+		nreq->rl_nchunks = 0;
+		nreq->rl_buffer = (struct rpcrdma_buffer *)req;
+		nreq->rl_reply = req->rl_reply;
+		memcpy(nreq->rl_segments,
+			req->rl_segments, sizeof nreq->rl_segments);
+		/* flag the swap with an unused field */
+		nreq->rl_iov.length = 0;
+		req->rl_reply = NULL;
+		req = nreq;
+	}
+	dprintk("RPC:       %s: size %zd, request 0x%p\n", __func__, size, req);
+out:
+	return req->rl_xdr_buf;
+
+outfail:
+	rpcrdma_buffer_put(req);
+	rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++;
+	return NULL;
+}
+
+/*
+ * This function returns all RDMA resources to the pool.
+ */
+static void
+xprt_rdma_free(void *buffer)
+{
+	struct rpcrdma_req *req;
+	struct rpcrdma_xprt *r_xprt;
+	struct rpcrdma_rep *rep;
+	int i;
+
+	if (buffer == NULL)
+		return;
+
+	req = container_of(buffer, struct rpcrdma_req, rl_xdr_buf[0]);
+	r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf);
+	rep = req->rl_reply;
+
+	dprintk("RPC:       %s: called on 0x%p%s\n",
+		__func__, rep, (rep && rep->rr_func) ? " (with waiter)" : "");
+
+	/*
+	 * Finish the deregistration. When using mw bind, this was
+	 * begun in rpcrdma_reply_handler(). In all other modes, we
+	 * do it here, in thread context. The process is considered
+	 * complete when the rr_func vector becomes NULL - this
+	 * was put in place during rpcrdma_reply_handler() - the wait
+	 * call below will not block if the dereg is "done". If
+	 * interrupted, our framework will clean up.
+	 */
+	for (i = 0; req->rl_nchunks;) {
+		--req->rl_nchunks;
+		i += rpcrdma_deregister_external(
+			&req->rl_segments[i], r_xprt, NULL);
+	}
+
+	if (rep && wait_event_interruptible(rep->rr_unbind, !rep->rr_func)) {
+		rep->rr_func = NULL;	/* abandon the callback */
+		req->rl_reply = NULL;
+	}
+
+	if (req->rl_iov.length == 0) {	/* see allocate above */
+		struct rpcrdma_req *oreq = (struct rpcrdma_req *)req->rl_buffer;
+		oreq->rl_reply = req->rl_reply;
+		(void) rpcrdma_deregister_internal(&r_xprt->rx_ia,
+						   req->rl_handle,
+						   &req->rl_iov);
+		kfree(req);
+		req = oreq;
+	}
+
+	/* Put back request+reply buffers */
+	rpcrdma_buffer_put(req);
+}
+
+/*
+ * send_request invokes the meat of RPC RDMA. It must do the following:
+ *  1.  Marshal the RPC request into an RPC RDMA request, which means
+ *	putting a header in front of data, and creating IOVs for RDMA
+ *	from those in the request.
+ *  2.  In marshaling, detect opportunities for RDMA, and use them.
+ *  3.  Post a recv message to set up asynch completion, then send
+ *	the request (rpcrdma_ep_post).
+ *  4.  No partial sends are possible in the RPC-RDMA protocol (as in UDP).
+ */
+
+static int
+xprt_rdma_send_request(struct rpc_task *task)
+{
+	struct rpc_rqst *rqst = task->tk_rqstp;
+	struct rpc_xprt *xprt = task->tk_xprt;
+	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+
+	/* marshal the send itself */
+	if (req->rl_niovs == 0 && rpcrdma_marshal_req(rqst) != 0) {
+		r_xprt->rx_stats.failed_marshal_count++;
+		dprintk("RPC:       %s: rpcrdma_marshal_req failed\n",
+			__func__);
+		return -EIO;
+	}
+
+	if (req->rl_reply == NULL) 		/* e.g. reconnection */
+		rpcrdma_recv_buffer_get(req);
+
+	if (req->rl_reply) {
+		req->rl_reply->rr_func = rpcrdma_reply_handler;
+		/* this need only be done once, but... */
+		req->rl_reply->rr_xprt = xprt;
+	}
+
+	if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) {
+		xprt_disconnect(xprt);
+		return -ENOTCONN;	/* implies disconnect */
+	}
+
+	rqst->rq_bytes_sent = 0;
+	return 0;
+}
+
+static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+	long idle_time = 0;
+
+	if (xprt_connected(xprt))
+		idle_time = (long)(jiffies - xprt->last_used) / HZ;
+
+	seq_printf(seq,
+	  "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu "
+	  "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n",
+
+	   0,	/* need a local port? */
+	   xprt->stat.bind_count,
+	   xprt->stat.connect_count,
+	   xprt->stat.connect_time,
+	   idle_time,
+	   xprt->stat.sends,
+	   xprt->stat.recvs,
+	   xprt->stat.bad_xids,
+	   xprt->stat.req_u,
+	   xprt->stat.bklog_u,
+
+	   r_xprt->rx_stats.read_chunk_count,
+	   r_xprt->rx_stats.write_chunk_count,
+	   r_xprt->rx_stats.reply_chunk_count,
+	   r_xprt->rx_stats.total_rdma_request,
+	   r_xprt->rx_stats.total_rdma_reply,
+	   r_xprt->rx_stats.pullup_copy_count,
+	   r_xprt->rx_stats.fixup_copy_count,
+	   r_xprt->rx_stats.hardway_register_count,
+	   r_xprt->rx_stats.failed_marshal_count,
+	   r_xprt->rx_stats.bad_reply_count);
+}
+
+/*
+ * Plumbing for rpc transport switch and kernel module
+ */
+
+static struct rpc_xprt_ops xprt_rdma_procs = {
+	.reserve_xprt		= xprt_rdma_reserve_xprt,
+	.release_xprt		= xprt_release_xprt_cong, /* sunrpc/xprt.c */
+	.release_request	= xprt_release_rqst_cong,       /* ditto */
+	.set_retrans_timeout	= xprt_set_retrans_timeout_def, /* ditto */
+	.rpcbind		= rpcb_getport_async,	/* sunrpc/rpcb_clnt.c */
+	.set_port		= xprt_rdma_set_port,
+	.connect		= xprt_rdma_connect,
+	.buf_alloc		= xprt_rdma_allocate,
+	.buf_free		= xprt_rdma_free,
+	.send_request		= xprt_rdma_send_request,
+	.close			= xprt_rdma_close,
+	.destroy		= xprt_rdma_destroy,
+	.print_stats		= xprt_rdma_print_stats
+};
+
+static struct xprt_class xprt_rdma = {
+	.list			= LIST_HEAD_INIT(xprt_rdma.list),
+	.name			= "rdma",
+	.owner			= THIS_MODULE,
+	.ident			= XPRT_TRANSPORT_RDMA,
+	.setup			= xprt_setup_rdma,
+};
+
+static void __exit xprt_rdma_cleanup(void)
+{
+	int rc;
+
+	dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n");
+#ifdef RPC_DEBUG
+	if (sunrpc_table_header) {
+		unregister_sysctl_table(sunrpc_table_header);
+		sunrpc_table_header = NULL;
+	}
+#endif
+	rc = xprt_unregister_transport(&xprt_rdma);
+	if (rc)
+		dprintk("RPC:       %s: xprt_unregister returned %i\n",
+			__func__, rc);
+}
+
+static int __init xprt_rdma_init(void)
+{
+	int rc;
+
+	rc = xprt_register_transport(&xprt_rdma);
+
+	if (rc)
+		return rc;
+
+	dprintk(KERN_INFO "RPCRDMA Module Init, register RPC RDMA transport\n");
+
+	dprintk(KERN_INFO "Defaults:\n");
+	dprintk(KERN_INFO "\tSlots %d\n"
+		"\tMaxInlineRead %d\n\tMaxInlineWrite %d\n",
+		xprt_rdma_slot_table_entries,
+		xprt_rdma_max_inline_read, xprt_rdma_max_inline_write);
+	dprintk(KERN_INFO "\tPadding %d\n\tMemreg %d\n",
+		xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy);
+
+#ifdef RPC_DEBUG
+	if (!sunrpc_table_header)
+		sunrpc_table_header = register_sysctl_table(sunrpc_table);
+#endif
+	return 0;
+}
+
+module_init(xprt_rdma_init);
+module_exit(xprt_rdma_cleanup);

net/sunrpc/xprtrdma/verbs.c

···
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * verbs.c
+ *
+ * Encapsulates the major functions managing:
+ *  o adapters
+ *  o endpoints
+ *  o connections
+ *  o buffer memory
+ */
+
+#include <linux/pci.h>	/* for Tavor hack below */
+
+#include "xprt_rdma.h"
+
+/*
+ * Globals/Macros
+ */
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+/*
+ * internal functions
+ */
+
+/*
+ * handle replies in tasklet context, using a single, global list
+ * rdma tasklet function -- just turn around and call the func
+ * for all replies on the list
+ */
+
+static DEFINE_SPINLOCK(rpcrdma_tk_lock_g);
+static LIST_HEAD(rpcrdma_tasklets_g);
+
+static void
+rpcrdma_run_tasklet(unsigned long data)
+{
+	struct rpcrdma_rep *rep;
+	void (*func)(struct rpcrdma_rep *);
+	unsigned long flags;
+
+	data = data;
+	spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
+	while (!list_empty(&rpcrdma_tasklets_g)) {
+		rep = list_entry(rpcrdma_tasklets_g.next,
+				 struct rpcrdma_rep, rr_list);
+		list_del(&rep->rr_list);
+		func = rep->rr_func;
+		rep->rr_func = NULL;
+		spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
+
+		if (func)
+			func(rep);
+		else
+			rpcrdma_recv_buffer_put(rep);
+
+		spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
+	}
+	spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
+}
+
+static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL);
+
+static inline void
+rpcrdma_schedule_tasklet(struct rpcrdma_rep *rep)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&rpcrdma_tk_lock_g, flags);
+	list_add_tail(&rep->rr_list, &rpcrdma_tasklets_g);
+	spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags);
+	tasklet_schedule(&rpcrdma_tasklet_g);
+}
+
+static void
+rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
+{
+	struct rpcrdma_ep *ep = context;
+
+	dprintk("RPC:       %s: QP error %X on device %s ep %p\n",
+		__func__, event->event, event->device->name, context);
+	if (ep->rep_connected == 1) {
+		ep->rep_connected = -EIO;
+		ep->rep_func(ep);
+		wake_up_all(&ep->rep_connect_wait);
+	}
+}
+
+static void
+rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context)
+{
+	struct rpcrdma_ep *ep = context;
+
+	dprintk("RPC:       %s: CQ error %X on device %s ep %p\n",
+		__func__, event->event, event->device->name, context);
+	if (ep->rep_connected == 1) {
+		ep->rep_connected = -EIO;
+		ep->rep_func(ep);
+		wake_up_all(&ep->rep_connect_wait);
+	}
+}
+
+static inline
+void rpcrdma_event_process(struct ib_wc *wc)
+{
+	struct rpcrdma_rep *rep =
+			(struct rpcrdma_rep *)(unsigned long) wc->wr_id;
+
+	dprintk("RPC:       %s: event rep %p status %X opcode %X length %u\n",
+		__func__, rep, wc->status, wc->opcode, wc->byte_len);
+
+	if (!rep) /* send or bind completion that we don't care about */
+		return;
+
+	if (IB_WC_SUCCESS != wc->status) {
+		dprintk("RPC:       %s: %s WC status %X, connection lost\n",
+			__func__, (wc->opcode & IB_WC_RECV) ? "recv" : "send",
+			 wc->status);
+		rep->rr_len = ~0U;
+		rpcrdma_schedule_tasklet(rep);
+		return;
+	}
+
+	switch (wc->opcode) {
+	case IB_WC_RECV:
+		rep->rr_len = wc->byte_len;
+		ib_dma_sync_single_for_cpu(
+			rdmab_to_ia(rep->rr_buffer)->ri_id->device,
+			rep->rr_iov.addr, rep->rr_len, DMA_FROM_DEVICE);
+		/* Keep (only) the most recent credits, after check validity */
+		if (rep->rr_len >= 16) {
+			struct rpcrdma_msg *p =
+					(struct rpcrdma_msg *) rep->rr_base;
+			unsigned int credits = ntohl(p->rm_credit);
+			if (credits == 0) {
+				dprintk("RPC:       %s: server"
+					" dropped credits to 0!\n", __func__);
+				/* don't deadlock */
+				credits = 1;
+			} else if (credits > rep->rr_buffer->rb_max_requests) {
+				dprintk("RPC:       %s: server"
+					" over-crediting: %d (%d)\n",
+					__func__, credits,
+					rep->rr_buffer->rb_max_requests);
+				credits = rep->rr_buffer->rb_max_requests;
+			}
+			atomic_set(&rep->rr_buffer->rb_credits, credits);
+		}
+		/* fall through */
+	case IB_WC_BIND_MW:
+		rpcrdma_schedule_tasklet(rep);
+		break;
+	default:
+		dprintk("RPC:       %s: unexpected WC event %X\n",
+			__func__, wc->opcode);
+		break;
+	}
+}
+
+static inline int
+rpcrdma_cq_poll(struct ib_cq *cq)
+{
+	struct ib_wc wc;
+	int rc;
+
+	for (;;) {
+		rc = ib_poll_cq(cq, 1, &wc);
+		if (rc < 0) {
+			dprintk("RPC:       %s: ib_poll_cq failed %i\n",
+				__func__, rc);
+			return rc;
+		}
+		if (rc == 0)
+			break;
+
+		rpcrdma_event_process(&wc);
+	}
+
+	return 0;
+}
+
+/*
+ * rpcrdma_cq_event_upcall
+ *
+ * This upcall handles recv, send, bind and unbind events.
+ * It is reentrant but processes single events in order to maintain
+ * ordering of receives to keep server credits.
+ *
+ * It is the responsibility of the scheduled tasklet to return
+ * recv buffers to the pool. NOTE: this affects synchronization of
+ * connection shutdown. That is, the structures required for
+ * the completion of the reply handler must remain intact until
+ * all memory has been reclaimed.
+ *
+ * Note that send events are suppressed and do not result in an upcall.
+ */
+static void
+rpcrdma_cq_event_upcall(struct ib_cq *cq, void *context)
+{
+	int rc;
+
+	rc = rpcrdma_cq_poll(cq);
+	if (rc)
+		return;
+
+	rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
+	if (rc) {
+		dprintk("RPC:       %s: ib_req_notify_cq failed %i\n",
+			__func__, rc);
+		return;
+	}
+
+	rpcrdma_cq_poll(cq);
+}
+
+#ifdef RPC_DEBUG
+static const char * const conn[] = {
+	"address resolved",
+	"address error",
+	"route resolved",
+	"route error",
+	"connect request",
+	"connect response",
+	"connect error",
+	"unreachable",
+	"rejected",
+	"established",
+	"disconnected",
+	"device removal"
+};
+#endif
+
+static int
+rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
+{
+	struct rpcrdma_xprt *xprt = id->context;
+	struct rpcrdma_ia *ia = &xprt->rx_ia;
+	struct rpcrdma_ep *ep = &xprt->rx_ep;
+	struct sockaddr_in *addr = (struct sockaddr_in *) &ep->rep_remote_addr;
+	struct ib_qp_attr attr;
+	struct ib_qp_init_attr iattr;
+	int connstate = 0;
+
+	switch (event->event) {
+	case RDMA_CM_EVENT_ADDR_RESOLVED:
+	case RDMA_CM_EVENT_ROUTE_RESOLVED:
+		complete(&ia->ri_done);
+		break;
+	case RDMA_CM_EVENT_ADDR_ERROR:
+		ia->ri_async_rc = -EHOSTUNREACH;
+		dprintk("RPC:       %s: CM address resolution error, ep 0x%p\n",
+			__func__, ep);
+		complete(&ia->ri_done);
+		break;
+	case RDMA_CM_EVENT_ROUTE_ERROR:
+		ia->ri_async_rc = -ENETUNREACH;
+		dprintk("RPC:       %s: CM route resolution error, ep 0x%p\n",
+			__func__, ep);
+		complete(&ia->ri_done);
+		break;
+	case RDMA_CM_EVENT_ESTABLISHED:
+		connstate = 1;
+		ib_query_qp(ia->ri_id->qp, &attr,
+			IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC,
+			&iattr);
+		dprintk("RPC:       %s: %d responder resources"
+			" (%d initiator)\n",
+			__func__, attr.max_dest_rd_atomic, attr.max_rd_atomic);
+		goto connected;
+	case RDMA_CM_EVENT_CONNECT_ERROR:
+		connstate = -ENOTCONN;
+		goto connected;
+	case RDMA_CM_EVENT_UNREACHABLE:
+		connstate = -ENETDOWN;
+		goto connected;
+	case RDMA_CM_EVENT_REJECTED:
+		connstate = -ECONNREFUSED;
+		goto connected;
+	case RDMA_CM_EVENT_DISCONNECTED:
+		connstate = -ECONNABORTED;
+		goto connected;
+	case RDMA_CM_EVENT_DEVICE_REMOVAL:
+		connstate = -ENODEV;
+connected:
+		dprintk("RPC:       %s: %s: %u.%u.%u.%u:%u"
+			" (ep 0x%p event 0x%x)\n",
+			__func__,
+			(event->event <= 11) ? conn[event->event] :
+						"unknown connection error",
+			NIPQUAD(addr->sin_addr.s_addr),
+			ntohs(addr->sin_port),
+			ep, event->event);
+		atomic_set(&rpcx_to_rdmax(ep->rep_xprt)->rx_buf.rb_credits, 1);
+		dprintk("RPC:       %s: %sconnected\n",
+					__func__, connstate > 0 ? "" : "dis");
+		ep->rep_connected = connstate;
+		ep->rep_func(ep);
+		wake_up_all(&ep->rep_connect_wait);
+		break;
+	default:
+		ia->ri_async_rc = -EINVAL;
+		dprintk("RPC:       %s: unexpected CM event %X\n",
+			__func__, event->event);
+		complete(&ia->ri_done);
+		break;
+	}
+
+	return 0;
+}
+
+static struct rdma_cm_id *
+rpcrdma_create_id(struct rpcrdma_xprt *xprt,
+			struct rpcrdma_ia *ia, struct sockaddr *addr)
+{
+	struct rdma_cm_id *id;
+	int rc;
+
+	id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP);
+	if (IS_ERR(id)) {
+		rc = PTR_ERR(id);
+		dprintk("RPC:       %s: rdma_create_id() failed %i\n",
+			__func__, rc);
+		return id;
+	}
+
+	ia->ri_async_rc = 0;
+	rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT);
+	if (rc) {
+		dprintk("RPC:       %s: rdma_resolve_addr() failed %i\n",
+			__func__, rc);
+		goto out;
+	}
+	wait_for_completion(&ia->ri_done);
+	rc = ia->ri_async_rc;
+	if (rc)
+		goto out;
+
+	ia->ri_async_rc = 0;
+	rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
+	if (rc) {
+		dprintk("RPC:       %s: rdma_resolve_route() failed %i\n",
+			__func__, rc);
+		goto out;
+	}
+	wait_for_completion(&ia->ri_done);
+	rc = ia->ri_async_rc;
+	if (rc)
+		goto out;
+
+	return id;
+
+out:
+	rdma_destroy_id(id);
+	return ERR_PTR(rc);
+}
+
+/*
+ * Drain any cq, prior to teardown.
+ */
+static void
+rpcrdma_clean_cq(struct ib_cq *cq)
+{
+	struct ib_wc wc;
+	int count = 0;
+
+	while (1 == ib_poll_cq(cq, 1, &wc))
+		++count;
+
+	if (count)
+		dprintk("RPC:       %s: flushed %d events (last 0x%x)\n",
+			__func__, count, wc.opcode);
+}
+
+/*
+ * Exported functions.
+ */
+
+/*
+ * Open and initialize an Interface Adapter.
+ *  o initializes fields of struct rpcrdma_ia, including
+ *    interface and provider attributes and protection zone.
+ */
+int
+rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
+{
+	int rc;
+	struct rpcrdma_ia *ia = &xprt->rx_ia;
+
+	init_completion(&ia->ri_done);
+
+	ia->ri_id = rpcrdma_create_id(xprt, ia, addr);
+	if (IS_ERR(ia->ri_id)) {
+		rc = PTR_ERR(ia->ri_id);
+		goto out1;
+	}
+
+	ia->ri_pd = ib_alloc_pd(ia->ri_id->device);
+	if (IS_ERR(ia->ri_pd)) {
+		rc = PTR_ERR(ia->ri_pd);
+		dprintk("RPC:       %s: ib_alloc_pd() failed %i\n",
+			__func__, rc);
+		goto out2;
+	}
+
+	/*
+	 * Optionally obtain an underlying physical identity mapping in
+	 * order to do a memory window-based bind. This base registration
+	 * is protected from remote access - that is enabled only by binding
+	 * for the specific bytes targeted during each RPC operation, and
+	 * revoked after the corresponding completion similar to a storage
+	 * adapter.
+	 */
+	if (memreg > RPCRDMA_REGISTER) {
+		int mem_priv = IB_ACCESS_LOCAL_WRITE;
+		switch (memreg) {
+#if RPCRDMA_PERSISTENT_REGISTRATION
+		case RPCRDMA_ALLPHYSICAL:
+			mem_priv |= IB_ACCESS_REMOTE_WRITE;
+			mem_priv |= IB_ACCESS_REMOTE_READ;
+			break;
+#endif
+		case RPCRDMA_MEMWINDOWS_ASYNC:
+		case RPCRDMA_MEMWINDOWS:
+			mem_priv |= IB_ACCESS_MW_BIND;
+			break;
+		default:
+			break;
+		}
+		ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv);
+		if (IS_ERR(ia->ri_bind_mem)) {
+			printk(KERN_ALERT "%s: ib_get_dma_mr for "
+				"phys register failed with %lX\n\t"
+				"Will continue with degraded performance\n",
+				__func__, PTR_ERR(ia->ri_bind_mem));
+			memreg = RPCRDMA_REGISTER;
+			ia->ri_bind_mem = NULL;
+		}
+	}
+
+	/* Else will do memory reg/dereg for each chunk */
+	ia->ri_memreg_strategy = memreg;
+
+	return 0;
+out2:
+	rdma_destroy_id(ia->ri_id);
+out1:
+	return rc;
+}
+
+/*
+ * Clean up/close an IA.
+ *   o if event handles and PD have been initialized, free them.
+ *   o close the IA
+ */
+void
+rpcrdma_ia_close(struct rpcrdma_ia *ia)
+{
+	int rc;
+
+	dprintk("RPC:       %s: entering\n", __func__);
+	if (ia->ri_bind_mem != NULL) {
+		rc = ib_dereg_mr(ia->ri_bind_mem);
+		dprintk("RPC:       %s: ib_dereg_mr returned %i\n",
+			__func__, rc);
+	}
+	if (ia->ri_id != NULL && !IS_ERR(ia->ri_id) && ia->ri_id->qp)
+		rdma_destroy_qp(ia->ri_id);
+	if (ia->ri_pd != NULL && !IS_ERR(ia->ri_pd)) {
+		rc = ib_dealloc_pd(ia->ri_pd);
+		dprintk("RPC:       %s: ib_dealloc_pd returned %i\n",
+			__func__, rc);
+	}
+	if (ia->ri_id != NULL && !IS_ERR(ia->ri_id))
+		rdma_destroy_id(ia->ri_id);
+}
+
+/*
+ * Create unconnected endpoint.
+ */
+int
+rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
+				struct rpcrdma_create_data_internal *cdata)
+{
+	struct ib_device_attr devattr;
+	int rc;
+
+	rc = ib_query_device(ia->ri_id->device, &devattr);
+	if (rc) {
+		dprintk("RPC:       %s: ib_query_device failed %d\n",
+			__func__, rc);
+		return rc;
+	}
+
+	/* check provider's send/recv wr limits */
+	if (cdata->max_requests > devattr.max_qp_wr)
+		cdata->max_requests = devattr.max_qp_wr;
+
+	ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
+	ep->rep_attr.qp_context = ep;
+	/* send_cq and recv_cq initialized below */
+	ep->rep_attr.srq = NULL;
+	ep->rep_attr.cap.max_send_wr = cdata->max_requests;
+	switch (ia->ri_memreg_strategy) {
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+	case RPCRDMA_MEMWINDOWS:
+		/* Add room for mw_binds+unbinds - overkill! */
+		ep->rep_attr.cap.max_send_wr++;
+		ep->rep_attr.cap.max_send_wr *= (2 * RPCRDMA_MAX_SEGS);
+		if (ep->rep_attr.cap.max_send_wr > devattr.max_qp_wr)
+			return -EINVAL;
+		break;
+	default:
+		break;
+	}
+	ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
+	ep->rep_attr.cap.max_send_sge = (cdata->padding ? 4 : 2);
+	ep->rep_attr.cap.max_recv_sge = 1;
+	ep->rep_attr.cap.max_inline_data = 0;
+	ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+	ep->rep_attr.qp_type = IB_QPT_RC;
+	ep->rep_attr.port_num = ~0;
+
+	dprintk("RPC:       %s: requested max: dtos: send %d recv %d; "
+		"iovs: send %d recv %d\n",
+		__func__,
+		ep->rep_attr.cap.max_send_wr,
+		ep->rep_attr.cap.max_recv_wr,
+		ep->rep_attr.cap.max_send_sge,
+		ep->rep_attr.cap.max_recv_sge);
+
+	/* set trigger for requesting send completion */
+	ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 /*  - 1*/;
+	switch (ia->ri_memreg_strategy) {
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+	case RPCRDMA_MEMWINDOWS:
+		ep->rep_cqinit -= RPCRDMA_MAX_SEGS;
+		break;
+	default:
+		break;
+	}
+	if (ep->rep_cqinit <= 2)
+		ep->rep_cqinit = 0;
+	INIT_CQCOUNT(ep);
+	ep->rep_ia = ia;
+	init_waitqueue_head(&ep->rep_connect_wait);
+
+	/*
+	 * Create a single cq for receive dto and mw_bind (only ever
+	 * care about unbind, really). Send completions are suppressed.
+	 * Use single threaded tasklet upcalls to maintain ordering.
+	 */
+	ep->rep_cq = ib_create_cq(ia->ri_id->device, rpcrdma_cq_event_upcall,
+				  rpcrdma_cq_async_error_upcall, NULL,
+				  ep->rep_attr.cap.max_recv_wr +
+				  ep->rep_attr.cap.max_send_wr + 1, 0);
+	if (IS_ERR(ep->rep_cq)) {
+		rc = PTR_ERR(ep->rep_cq);
+		dprintk("RPC:       %s: ib_create_cq failed: %i\n",
+			__func__, rc);
+		goto out1;
+	}
+
+	rc = ib_req_notify_cq(ep->rep_cq, IB_CQ_NEXT_COMP);
+	if (rc) {
+		dprintk("RPC:       %s: ib_req_notify_cq failed: %i\n",
+			__func__, rc);
+		goto out2;
+	}
+
+	ep->rep_attr.send_cq = ep->rep_cq;
+	ep->rep_attr.recv_cq = ep->rep_cq;
+
+	/* Initialize cma parameters */
+
+	/* RPC/RDMA does not use private data */
+	ep->rep_remote_cma.private_data = NULL;
+	ep->rep_remote_cma.private_data_len = 0;
+
+	/* Client offers RDMA Read but does not initiate */
+	switch (ia->ri_memreg_strategy) {
+	case RPCRDMA_BOUNCEBUFFERS:
+		ep->rep_remote_cma.responder_resources = 0;
+		break;
+	case RPCRDMA_MTHCAFMR:
+	case RPCRDMA_REGISTER:
+		ep->rep_remote_cma.responder_resources = cdata->max_requests *
+				(RPCRDMA_MAX_DATA_SEGS / 8);
+		break;
+	case RPCRDMA_MEMWINDOWS:
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+#if RPCRDMA_PERSISTENT_REGISTRATION
+	case RPCRDMA_ALLPHYSICAL:
+#endif
+		ep->rep_remote_cma.responder_resources = cdata->max_requests *
+				(RPCRDMA_MAX_DATA_SEGS / 2);
+		break;
+	default:
+		break;
+	}
+	if (ep->rep_remote_cma.responder_resources > devattr.max_qp_rd_atom)
+		ep->rep_remote_cma.responder_resources = devattr.max_qp_rd_atom;
+	ep->rep_remote_cma.initiator_depth = 0;
+
+	ep->rep_remote_cma.retry_count = 7;
+	ep->rep_remote_cma.flow_control = 0;
+	ep->rep_remote_cma.rnr_retry_count = 0;
+
+	return 0;
+
+out2:
+	if (ib_destroy_cq(ep->rep_cq))
+		;
+out1:
+	return rc;
+}
+
+/*
+ * rpcrdma_ep_destroy
+ *
+ * Disconnect and destroy endpoint. After this, the only
+ * valid operations on the ep are to free it (if dynamically
+ * allocated) or re-create it.
+ *
+ * The caller's error handling must be sure to not leak the endpoint
+ * if this function fails.
+ */
+int
+rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
+{
+	int rc;
+
+	dprintk("RPC:       %s: entering, connected is %d\n",
+		__func__, ep->rep_connected);
+
+	if (ia->ri_id->qp) {
+		rc = rpcrdma_ep_disconnect(ep, ia);
+		if (rc)
+			dprintk("RPC:       %s: rpcrdma_ep_disconnect"
+				" returned %i\n", __func__, rc);
+	}
+
+	ep->rep_func = NULL;
+
+	/* padding - could be done in rpcrdma_buffer_destroy... */
+	if (ep->rep_pad_mr) {
+		rpcrdma_deregister_internal(ia, ep->rep_pad_mr, &ep->rep_pad);
+		ep->rep_pad_mr = NULL;
+	}
+
+	if (ia->ri_id->qp) {
+		rdma_destroy_qp(ia->ri_id);
+		ia->ri_id->qp = NULL;
+	}
+
+	rpcrdma_clean_cq(ep->rep_cq);
+	rc = ib_destroy_cq(ep->rep_cq);
+	if (rc)
+		dprintk("RPC:       %s: ib_destroy_cq returned %i\n",
+			__func__, rc);
+
+	return rc;
+}
+
+/*
+ * Connect unconnected endpoint.
+ */
+int
+rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
+{
+	struct rdma_cm_id *id;
+	int rc = 0;
+	int retry_count = 0;
+	int reconnect = (ep->rep_connected != 0);
+
+	if (reconnect) {
+		struct rpcrdma_xprt *xprt;
+retry:
+		rc = rpcrdma_ep_disconnect(ep, ia);
+		if (rc && rc != -ENOTCONN)
+			dprintk("RPC:       %s: rpcrdma_ep_disconnect"
+				" status %i\n", __func__, rc);
+		rpcrdma_clean_cq(ep->rep_cq);
+
+		xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
+		id = rpcrdma_create_id(xprt, ia,
+				(struct sockaddr *)&xprt->rx_data.addr);
+		if (IS_ERR(id)) {
+			rc = PTR_ERR(id);
+			goto out;
+		}
+		/* TEMP TEMP TEMP - fail if new device:
+		 * Deregister/remarshal *all* requests!
+		 * Close and recreate adapter, pd, etc!
+		 * Re-determine all attributes still sane!
+		 * More stuff I haven't thought of!
+		 * Rrrgh!
+		 */
+		if (ia->ri_id->device != id->device) {
+			printk("RPC:       %s: can't reconnect on "
+				"different device!\n", __func__);
+			rdma_destroy_id(id);
+			rc = -ENETDOWN;
+			goto out;
+		}
+		/* END TEMP */
+		rdma_destroy_id(ia->ri_id);
+		ia->ri_id = id;
+	}
+
+	rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
+	if (rc) {
+		dprintk("RPC:       %s: rdma_create_qp failed %i\n",
+			__func__, rc);
+		goto out;
+	}
+
+/* XXX Tavor device performs badly with 2K MTU! */
+if (strnicmp(ia->ri_id->device->dma_device->bus->name, "pci", 3) == 0) {
+	struct pci_dev *pcid = to_pci_dev(ia->ri_id->device->dma_device);
+	if (pcid->device == PCI_DEVICE_ID_MELLANOX_TAVOR &&
+	    (pcid->vendor == PCI_VENDOR_ID_MELLANOX ||
+	     pcid->vendor == PCI_VENDOR_ID_TOPSPIN)) {
+		struct ib_qp_attr attr = {
+			.path_mtu = IB_MTU_1024
+		};
+		rc = ib_modify_qp(ia->ri_id->qp, &attr, IB_QP_PATH_MTU);
+	}
+}
+
+	/* Theoretically a client initiator_depth > 0 is not needed,
+	 * but many peers fail to complete the connection unless they
+	 * == responder_resources! */
+	if (ep->rep_remote_cma.initiator_depth !=
+				ep->rep_remote_cma.responder_resources)
+		ep->rep_remote_cma.initiator_depth =
+			ep->rep_remote_cma.responder_resources;
+
+	ep->rep_connected = 0;
+
+	rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma);
+	if (rc) {
+		dprintk("RPC:       %s: rdma_connect() failed with %i\n",
+				__func__, rc);
+		goto out;
+	}
+
+	if (reconnect)
+		return 0;
+
+	wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0);
+
+	/*
+	 * Check state. A non-peer reject indicates no listener
+	 * (ECONNREFUSED), which may be a transient state. All
+	 * others indicate a transport condition which has already
+	 * undergone a best-effort.
+	 */
+	if (ep->rep_connected == -ECONNREFUSED
+	    && ++retry_count <= RDMA_CONNECT_RETRY_MAX) {
+		dprintk("RPC:       %s: non-peer_reject, retry\n", __func__);
+		goto retry;
+	}
+	if (ep->rep_connected <= 0) {
+		/* Sometimes, the only way to reliably connect to remote
+		 * CMs is to use same nonzero values for ORD and IRD. */
+		ep->rep_remote_cma.initiator_depth =
+					ep->rep_remote_cma.responder_resources;
+		if (ep->rep_remote_cma.initiator_depth == 0)
+			++ep->rep_remote_cma.initiator_depth;
+		if (ep->rep_remote_cma.responder_resources == 0)
+			++ep->rep_remote_cma.responder_resources;
+		if (retry_count++ == 0)
+			goto retry;
+		rc = ep->rep_connected;
+	} else {
+		dprintk("RPC:       %s: connected\n", __func__);
+	}
+
+out:
+	if (rc)
+		ep->rep_connected = rc;
+	return rc;
+}
+
+/*
+ * rpcrdma_ep_disconnect
+ *
+ * This is separate from destroy to facilitate the ability
+ * to reconnect without recreating the endpoint.
+ *
+ * This call is not reentrant, and must not be made in parallel
+ * on the same endpoint.
+ */
+int
+rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
+{
+	int rc;
+
+	rpcrdma_clean_cq(ep->rep_cq);
+	rc = rdma_disconnect(ia->ri_id);
+	if (!rc) {
+		/* returns without wait if not connected */
+		wait_event_interruptible(ep->rep_connect_wait,
+							ep->rep_connected != 1);
+		dprintk("RPC:       %s: after wait, %sconnected\n", __func__,
+			(ep->rep_connected == 1) ? "still " : "dis");
+	} else {
+		dprintk("RPC:       %s: rdma_disconnect %i\n", __func__, rc);
+		ep->rep_connected = rc;
+	}
+	return rc;
+}
+
+/*
+ * Initialize buffer memory
+ */
+int
+rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep,
+	struct rpcrdma_ia *ia, struct rpcrdma_create_data_internal *cdata)
+{
+	char *p;
+	size_t len;
+	int i, rc;
+
+	buf->rb_max_requests = cdata->max_requests;
+	spin_lock_init(&buf->rb_lock);
+	atomic_set(&buf->rb_credits, 1);
+
+	/* Need to allocate:
+	 *   1.  arrays for send and recv pointers
+	 *   2.  arrays of struct rpcrdma_req to fill in pointers
+	 *   3.  array of struct rpcrdma_rep for replies
+	 *   4.  padding, if any
+	 *   5.  mw's, if any
+	 * Send/recv buffers in req/rep need to be registered
+	 */
+
+	len = buf->rb_max_requests *
+		(sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *));
+	len += cdata->padding;
+	switch (ia->ri_memreg_strategy) {
+	case RPCRDMA_MTHCAFMR:
+		/* TBD we are perhaps overallocating here */
+		len += (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS *
+				sizeof(struct rpcrdma_mw);
+		break;
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+	case RPCRDMA_MEMWINDOWS:
+		len += (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS *
+				sizeof(struct rpcrdma_mw);
+		break;
+	default:
+		break;
+	}
+
+	/* allocate 1, 4 and 5 in one shot */
+	p = kzalloc(len, GFP_KERNEL);
+	if (p == NULL) {
+		dprintk("RPC:       %s: req_t/rep_t/pad kzalloc(%zd) failed\n",
+			__func__, len);
+		rc = -ENOMEM;
+		goto out;
+	}
+	buf->rb_pool = p;	/* for freeing it later */
+
+	buf->rb_send_bufs = (struct rpcrdma_req **) p;
+	p = (char *) &buf->rb_send_bufs[buf->rb_max_requests];
+	buf->rb_recv_bufs = (struct rpcrdma_rep **) p;
+	p = (char *) &buf->rb_recv_bufs[buf->rb_max_requests];
+
+	/*
+	 * Register the zeroed pad buffer, if any.
+	 */
+	if (cdata->padding) {
+		rc = rpcrdma_register_internal(ia, p, cdata->padding,
+					    &ep->rep_pad_mr, &ep->rep_pad);
+		if (rc)
+			goto out;
+	}
+	p += cdata->padding;
+
+	/*
+	 * Allocate the fmr's, or mw's for mw_bind chunk registration.
+	 * We "cycle" the mw's in order to minimize rkey reuse,
+	 * and also reduce unbind-to-bind collision.
+	 */
+	INIT_LIST_HEAD(&buf->rb_mws);
+	switch (ia->ri_memreg_strategy) {
+	case RPCRDMA_MTHCAFMR:
+		{
+		struct rpcrdma_mw *r = (struct rpcrdma_mw *)p;
+		struct ib_fmr_attr fa = {
+			RPCRDMA_MAX_DATA_SEGS, 1, PAGE_SHIFT
+		};
+		/* TBD we are perhaps overallocating here */
+		for (i = (buf->rb_max_requests+1) * RPCRDMA_MAX_SEGS; i; i--) {
+			r->r.fmr = ib_alloc_fmr(ia->ri_pd,
+				IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ,
+				&fa);
+			if (IS_ERR(r->r.fmr)) {
+				rc = PTR_ERR(r->r.fmr);
+				dprintk("RPC:       %s: ib_alloc_fmr"
+					" failed %i\n", __func__, rc);
+				goto out;
+			}
+			list_add(&r->mw_list, &buf->rb_mws);
+			++r;
+		}
+		}
+		break;
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+	case RPCRDMA_MEMWINDOWS:
+		{
+		struct rpcrdma_mw *r = (struct rpcrdma_mw *)p;
+		/* Allocate one extra request's worth, for full cycling */
+		for (i = (buf->rb_max_requests+1) * RPCRDMA_MAX_SEGS; i; i--) {
+			r->r.mw = ib_alloc_mw(ia->ri_pd);
+			if (IS_ERR(r->r.mw)) {
+				rc = PTR_ERR(r->r.mw);
+				dprintk("RPC:       %s: ib_alloc_mw"
+					" failed %i\n", __func__, rc);
+				goto out;
+			}
+			list_add(&r->mw_list, &buf->rb_mws);
+			++r;
+		}
+		}
+		break;
+	default:
+		break;
+	}
+
+	/*
+	 * Allocate/init the request/reply buffers. Doing this
+	 * using kmalloc for now -- one for each buf.
+	 */
+	for (i = 0; i < buf->rb_max_requests; i++) {
+		struct rpcrdma_req *req;
+		struct rpcrdma_rep *rep;
+
+		len = cdata->inline_wsize + sizeof(struct rpcrdma_req);
+		/* RPC layer requests *double* size + 1K RPC_SLACK_SPACE! */
+		/* Typical ~2400b, so rounding up saves work later */
+		if (len < 4096)
+			len = 4096;
+		req = kmalloc(len, GFP_KERNEL);
+		if (req == NULL) {
+			dprintk("RPC:       %s: request buffer %d alloc"
+				" failed\n", __func__, i);
+			rc = -ENOMEM;
+			goto out;
+		}
+		memset(req, 0, sizeof(struct rpcrdma_req));
+		buf->rb_send_bufs[i] = req;
+		buf->rb_send_bufs[i]->rl_buffer = buf;
+
+		rc = rpcrdma_register_internal(ia, req->rl_base,
+				len - offsetof(struct rpcrdma_req, rl_base),
+				&buf->rb_send_bufs[i]->rl_handle,
+				&buf->rb_send_bufs[i]->rl_iov);
+		if (rc)
+			goto out;
+
+		buf->rb_send_bufs[i]->rl_size = len-sizeof(struct rpcrdma_req);
+
+		len = cdata->inline_rsize + sizeof(struct rpcrdma_rep);
+		rep = kmalloc(len, GFP_KERNEL);
+		if (rep == NULL) {
+			dprintk("RPC:       %s: reply buffer %d alloc failed\n",
+				__func__, i);
+			rc = -ENOMEM;
+			goto out;
+		}
+		memset(rep, 0, sizeof(struct rpcrdma_rep));
+		buf->rb_recv_bufs[i] = rep;
+		buf->rb_recv_bufs[i]->rr_buffer = buf;
+		init_waitqueue_head(&rep->rr_unbind);
+
+		rc = rpcrdma_register_internal(ia, rep->rr_base,
+				len - offsetof(struct rpcrdma_rep, rr_base),
+				&buf->rb_recv_bufs[i]->rr_handle,
+				&buf->rb_recv_bufs[i]->rr_iov);
+		if (rc)
+			goto out;
+
+	}
+	dprintk("RPC:       %s: max_requests %d\n",
+		__func__, buf->rb_max_requests);
+	/* done */
+	return 0;
+out:
+	rpcrdma_buffer_destroy(buf);
+	return rc;
+}
+
+/*
+ * Unregister and destroy buffer memory. Need to deal with
+ * partial initialization, so it's callable from failed create.
+ * Must be called before destroying endpoint, as registrations
+ * reference it.
+ */
+void
+rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
+{
+	int rc, i;
+	struct rpcrdma_ia *ia = rdmab_to_ia(buf);
+
+	/* clean up in reverse order from create
+	 *   1.  recv mr memory (mr free, then kfree)
+	 *   1a. bind mw memory
+	 *   2.  send mr memory (mr free, then kfree)
+	 *   3.  padding (if any) [moved to rpcrdma_ep_destroy]
+	 *   4.  arrays
+	 */
+	dprintk("RPC:       %s: entering\n", __func__);
+
+	for (i = 0; i < buf->rb_max_requests; i++) {
+		if (buf->rb_recv_bufs && buf->rb_recv_bufs[i]) {
+			rpcrdma_deregister_internal(ia,
+					buf->rb_recv_bufs[i]->rr_handle,
+					&buf->rb_recv_bufs[i]->rr_iov);
+			kfree(buf->rb_recv_bufs[i]);
+		}
+		if (buf->rb_send_bufs && buf->rb_send_bufs[i]) {
+			while (!list_empty(&buf->rb_mws)) {
+				struct rpcrdma_mw *r;
+				r = list_entry(buf->rb_mws.next,
+					struct rpcrdma_mw, mw_list);
+				list_del(&r->mw_list);
+				switch (ia->ri_memreg_strategy) {
+				case RPCRDMA_MTHCAFMR:
+					rc = ib_dealloc_fmr(r->r.fmr);
+					if (rc)
+						dprintk("RPC:       %s:"
+							" ib_dealloc_fmr"
+							" failed %i\n",
+							__func__, rc);
+					break;
+				case RPCRDMA_MEMWINDOWS_ASYNC:
+				case RPCRDMA_MEMWINDOWS:
+					rc = ib_dealloc_mw(r->r.mw);
+					if (rc)
+						dprintk("RPC:       %s:"
+							" ib_dealloc_mw"
+							" failed %i\n",
+							__func__, rc);
+					break;
+				default:
+					break;
+				}
+			}
+			rpcrdma_deregister_internal(ia,
+					buf->rb_send_bufs[i]->rl_handle,
+					&buf->rb_send_bufs[i]->rl_iov);
+			kfree(buf->rb_send_bufs[i]);
+		}
+	}
+
+	kfree(buf->rb_pool);
+}
+
+/*
+ * Get a set of request/reply buffers.
+ *
+ * Reply buffer (if needed) is attached to send buffer upon return.
+ * Rule:
+ *    rb_send_index and rb_recv_index MUST always be pointing to the
+ *    *next* available buffer (non-NULL). They are incremented after
+ *    removing buffers, and decremented *before* returning them.
+ */
+struct rpcrdma_req *
+rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
+{
+	struct rpcrdma_req *req;
+	unsigned long flags;
+
+	spin_lock_irqsave(&buffers->rb_lock, flags);
+	if (buffers->rb_send_index == buffers->rb_max_requests) {
+		spin_unlock_irqrestore(&buffers->rb_lock, flags);
+		dprintk("RPC:       %s: out of request buffers\n", __func__);
+		return ((struct rpcrdma_req *)NULL);
+	}
+
+	req = buffers->rb_send_bufs[buffers->rb_send_index];
+	if (buffers->rb_send_index < buffers->rb_recv_index) {
+		dprintk("RPC:       %s: %d extra receives outstanding (ok)\n",
+			__func__,
+			buffers->rb_recv_index - buffers->rb_send_index);
+		req->rl_reply = NULL;
+	} else {
+		req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index];
+		buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL;
+	}
+	buffers->rb_send_bufs[buffers->rb_send_index++] = NULL;
+	if (!list_empty(&buffers->rb_mws)) {
+		int i = RPCRDMA_MAX_SEGS - 1;
+		do {
+			struct rpcrdma_mw *r;
+			r = list_entry(buffers->rb_mws.next,
+					struct rpcrdma_mw, mw_list);
+			list_del(&r->mw_list);
+			req->rl_segments[i].mr_chunk.rl_mw = r;
+		} while (--i >= 0);
+	}
+	spin_unlock_irqrestore(&buffers->rb_lock, flags);
+	return req;
+}
+
+/*
+ * Put request/reply buffers back into pool.
+ * Pre-decrement counter/array index.
+ */
+void
+rpcrdma_buffer_put(struct rpcrdma_req *req)
+{
+	struct rpcrdma_buffer *buffers = req->rl_buffer;
+	struct rpcrdma_ia *ia = rdmab_to_ia(buffers);
+	int i;
+	unsigned long flags;
+
+	BUG_ON(req->rl_nchunks != 0);
+	spin_lock_irqsave(&buffers->rb_lock, flags);
+	buffers->rb_send_bufs[--buffers->rb_send_index] = req;
+	req->rl_niovs = 0;
+	if (req->rl_reply) {
+		buffers->rb_recv_bufs[--buffers->rb_recv_index] = req->rl_reply;
+		init_waitqueue_head(&req->rl_reply->rr_unbind);
+		req->rl_reply->rr_func = NULL;
+		req->rl_reply = NULL;
+	}
+	switch (ia->ri_memreg_strategy) {
+	case RPCRDMA_MTHCAFMR:
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+	case RPCRDMA_MEMWINDOWS:
+		/*
+		 * Cycle mw's back in reverse order, and "spin" them.
+		 * This delays and scrambles reuse as much as possible.
+		 */
+		i = 1;
+		do {
+			struct rpcrdma_mw **mw;
+			mw = &req->rl_segments[i].mr_chunk.rl_mw;
+			list_add_tail(&(*mw)->mw_list, &buffers->rb_mws);
+			*mw = NULL;
+		} while (++i < RPCRDMA_MAX_SEGS);
+		list_add_tail(&req->rl_segments[0].mr_chunk.rl_mw->mw_list,
+					&buffers->rb_mws);
+		req->rl_segments[0].mr_chunk.rl_mw = NULL;
+		break;
+	default:
+		break;
+	}
+	spin_unlock_irqrestore(&buffers->rb_lock, flags);
+}
+
+/*
+ * Recover reply buffers from pool.
+ * This happens when recovering from error conditions.
+ * Post-increment counter/array index.
+ */
+void
+rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
+{
+	struct rpcrdma_buffer *buffers = req->rl_buffer;
+	unsigned long flags;
+
+	if (req->rl_iov.length == 0)	/* special case xprt_rdma_allocate() */
+		buffers = ((struct rpcrdma_req *) buffers)->rl_buffer;
+	spin_lock_irqsave(&buffers->rb_lock, flags);
+	if (buffers->rb_recv_index < buffers->rb_max_requests) {
+		req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index];
+		buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL;
+	}
+	spin_unlock_irqrestore(&buffers->rb_lock, flags);
+}
+
+/*
+ * Put reply buffers back into pool when not attached to
+ * request. This happens in error conditions, and when
+ * aborting unbinds. Pre-decrement counter/array index.
+ */
+void
+rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
+{
+	struct rpcrdma_buffer *buffers = rep->rr_buffer;
+	unsigned long flags;
+
+	rep->rr_func = NULL;
+	spin_lock_irqsave(&buffers->rb_lock, flags);
+	buffers->rb_recv_bufs[--buffers->rb_recv_index] = rep;
+	spin_unlock_irqrestore(&buffers->rb_lock, flags);
+}
+
+/*
+ * Wrappers for internal-use kmalloc memory registration, used by buffer code.
+ */
+
+int
+rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len,
+				struct ib_mr **mrp, struct ib_sge *iov)
+{
+	struct ib_phys_buf ipb;
+	struct ib_mr *mr;
+	int rc;
+
+	/*
+	 * All memory passed here was kmalloc'ed, therefore phys-contiguous.
+	 */
+	iov->addr = ib_dma_map_single(ia->ri_id->device,
+			va, len, DMA_BIDIRECTIONAL);
+	iov->length = len;
+
+	if (ia->ri_bind_mem != NULL) {
+		*mrp = NULL;
+		iov->lkey = ia->ri_bind_mem->lkey;
+		return 0;
+	}
+
+	ipb.addr = iov->addr;
+	ipb.size = iov->length;
+	mr = ib_reg_phys_mr(ia->ri_pd, &ipb, 1,
+			IB_ACCESS_LOCAL_WRITE, &iov->addr);
+
+	dprintk("RPC:       %s: phys convert: 0x%llx "
+			"registered 0x%llx length %d\n",
+			__func__, ipb.addr, iov->addr, len);
+
+	if (IS_ERR(mr)) {
+		*mrp = NULL;
+		rc = PTR_ERR(mr);
+		dprintk("RPC:       %s: failed with %i\n", __func__, rc);
+	} else {
+		*mrp = mr;
+		iov->lkey = mr->lkey;
+		rc = 0;
+	}
+
+	return rc;
+}
+
+int
+rpcrdma_deregister_internal(struct rpcrdma_ia *ia,
+				struct ib_mr *mr, struct ib_sge *iov)
+{
+	int rc;
+
+	ib_dma_unmap_single(ia->ri_id->device,
+			iov->addr, iov->length, DMA_BIDIRECTIONAL);
+
+	if (NULL == mr)
+		return 0;
+
+	rc = ib_dereg_mr(mr);
+	if (rc)
+		dprintk("RPC:       %s: ib_dereg_mr failed %i\n", __func__, rc);
+	return rc;
+}
+
+/*
+ * Wrappers for chunk registration, shared by read/write chunk code.
+ */
+
+static void
+rpcrdma_map_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg, int writing)
+{
+	seg->mr_dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+	seg->mr_dmalen = seg->mr_len;
+	if (seg->mr_page)
+		seg->mr_dma = ib_dma_map_page(ia->ri_id->device,
+				seg->mr_page, offset_in_page(seg->mr_offset),
+				seg->mr_dmalen, seg->mr_dir);
+	else
+		seg->mr_dma = ib_dma_map_single(ia->ri_id->device,
+				seg->mr_offset,
+				seg->mr_dmalen, seg->mr_dir);
+}
+
+static void
+rpcrdma_unmap_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg)
+{
+	if (seg->mr_page)
+		ib_dma_unmap_page(ia->ri_id->device,
+				seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
+	else
+		ib_dma_unmap_single(ia->ri_id->device,
+				seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
+}
+
+int
+rpcrdma_register_external(struct rpcrdma_mr_seg *seg,
+			int nsegs, int writing, struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+	int mem_priv = (writing ? IB_ACCESS_REMOTE_WRITE :
+				  IB_ACCESS_REMOTE_READ);
+	struct rpcrdma_mr_seg *seg1 = seg;
+	int i;
+	int rc = 0;
+
+	switch (ia->ri_memreg_strategy) {
+
+#if RPCRDMA_PERSISTENT_REGISTRATION
+	case RPCRDMA_ALLPHYSICAL:
+		rpcrdma_map_one(ia, seg, writing);
+		seg->mr_rkey = ia->ri_bind_mem->rkey;
+		seg->mr_base = seg->mr_dma;
+		seg->mr_nsegs = 1;
+		nsegs = 1;
+		break;
+#endif
+
+	/* Registration using fast memory registration */
+	case RPCRDMA_MTHCAFMR:
+		{
+		u64 physaddrs[RPCRDMA_MAX_DATA_SEGS];
+		int len, pageoff = offset_in_page(seg->mr_offset);
+		seg1->mr_offset -= pageoff;	/* start of page */
+		seg1->mr_len += pageoff;
+		len = -pageoff;
+		if (nsegs > RPCRDMA_MAX_DATA_SEGS)
+			nsegs = RPCRDMA_MAX_DATA_SEGS;
+		for (i = 0; i < nsegs;) {
+			rpcrdma_map_one(ia, seg, writing);
+			physaddrs[i] = seg->mr_dma;
+			len += seg->mr_len;
+			++seg;
+			++i;
+			/* Check for holes */
+			if ((i < nsegs && offset_in_page(seg->mr_offset)) ||
+			    offset_in_page((seg-1)->mr_offset+(seg-1)->mr_len))
+				break;
+		}
+		nsegs = i;
+		rc = ib_map_phys_fmr(seg1->mr_chunk.rl_mw->r.fmr,
+					physaddrs, nsegs, seg1->mr_dma);
+		if (rc) {
+			dprintk("RPC:       %s: failed ib_map_phys_fmr "
+				"%u@0x%llx+%i (%d)... status %i\n", __func__,
+				len, (unsigned long long)seg1->mr_dma,
+				pageoff, nsegs, rc);
+			while (nsegs--)
+				rpcrdma_unmap_one(ia, --seg);
+		} else {
+			seg1->mr_rkey = seg1->mr_chunk.rl_mw->r.fmr->rkey;
+			seg1->mr_base = seg1->mr_dma + pageoff;
+			seg1->mr_nsegs = nsegs;
+			seg1->mr_len = len;
+		}
+		}
+		break;
+
+	/* Registration using memory windows */
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+	case RPCRDMA_MEMWINDOWS:
+		{
+		struct ib_mw_bind param;
+		rpcrdma_map_one(ia, seg, writing);
+		param.mr = ia->ri_bind_mem;
+		param.wr_id = 0ULL;	/* no send cookie */
+		param.addr = seg->mr_dma;
+		param.length = seg->mr_len;
+		param.send_flags = 0;
+		param.mw_access_flags = mem_priv;
+
+		DECR_CQCOUNT(&r_xprt->rx_ep);
+		rc = ib_bind_mw(ia->ri_id->qp,
+					seg->mr_chunk.rl_mw->r.mw, &param);
+		if (rc) {
+			dprintk("RPC:       %s: failed ib_bind_mw "
+				"%u@0x%llx status %i\n",
+				__func__, seg->mr_len,
+				(unsigned long long)seg->mr_dma, rc);
+			rpcrdma_unmap_one(ia, seg);
+		} else {
+			seg->mr_rkey = seg->mr_chunk.rl_mw->r.mw->rkey;
+			seg->mr_base = param.addr;
+			seg->mr_nsegs = 1;
+			nsegs = 1;
+		}
+		}
+		break;
+
+	/* Default registration each time */
+	default:
+		{
+		struct ib_phys_buf ipb[RPCRDMA_MAX_DATA_SEGS];
+		int len = 0;
+		if (nsegs > RPCRDMA_MAX_DATA_SEGS)
+			nsegs = RPCRDMA_MAX_DATA_SEGS;
+		for (i = 0; i < nsegs;) {
+			rpcrdma_map_one(ia, seg, writing);
+			ipb[i].addr = seg->mr_dma;
+			ipb[i].size = seg->mr_len;
+			len += seg->mr_len;
+			++seg;
+			++i;
+			/* Check for holes */
+			if ((i < nsegs && offset_in_page(seg->mr_offset)) ||
+			    offset_in_page((seg-1)->mr_offset+(seg-1)->mr_len))
+				break;
+		}
+		nsegs = i;
+		seg1->mr_base = seg1->mr_dma;
+		seg1->mr_chunk.rl_mr = ib_reg_phys_mr(ia->ri_pd,
+					ipb, nsegs, mem_priv, &seg1->mr_base);
+		if (IS_ERR(seg1->mr_chunk.rl_mr)) {
+			rc = PTR_ERR(seg1->mr_chunk.rl_mr);
+			dprintk("RPC:       %s: failed ib_reg_phys_mr "
+				"%u@0x%llx (%d)... status %i\n",
+				__func__, len,
+				(unsigned long long)seg1->mr_dma, nsegs, rc);
+			while (nsegs--)
+				rpcrdma_unmap_one(ia, --seg);
+		} else {
+			seg1->mr_rkey = seg1->mr_chunk.rl_mr->rkey;
+			seg1->mr_nsegs = nsegs;
+			seg1->mr_len = len;
+		}
+		}
+		break;
+	}
+	if (rc)
+		return -1;
+
+	return nsegs;
+}
+
+int
+rpcrdma_deregister_external(struct rpcrdma_mr_seg *seg,
+		struct rpcrdma_xprt *r_xprt, void *r)
+{
+	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+	struct rpcrdma_mr_seg *seg1 = seg;
+	int nsegs = seg->mr_nsegs, rc;
+
+	switch (ia->ri_memreg_strategy) {
+
+#if RPCRDMA_PERSISTENT_REGISTRATION
+	case RPCRDMA_ALLPHYSICAL:
+		BUG_ON(nsegs != 1);
+		rpcrdma_unmap_one(ia, seg);
+		rc = 0;
+		break;
+#endif
+
+	case RPCRDMA_MTHCAFMR:
+		{
+		LIST_HEAD(l);
+		list_add(&seg->mr_chunk.rl_mw->r.fmr->list, &l);
+		rc = ib_unmap_fmr(&l);
+		while (seg1->mr_nsegs--)
+			rpcrdma_unmap_one(ia, seg++);
+		}
+		if (rc)
+			dprintk("RPC:       %s: failed ib_unmap_fmr,"
+				" status %i\n", __func__, rc);
+		break;
+
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+	case RPCRDMA_MEMWINDOWS:
+		{
+		struct ib_mw_bind param;
+		BUG_ON(nsegs != 1);
+		param.mr = ia->ri_bind_mem;
+		param.addr = 0ULL;	/* unbind */
+		param.length = 0;
+		param.mw_access_flags = 0;
+		if (r) {
+			param.wr_id = (u64) (unsigned long) r;
+			param.send_flags = IB_SEND_SIGNALED;
+			INIT_CQCOUNT(&r_xprt->rx_ep);
+		} else {
+			param.wr_id = 0ULL;
+			param.send_flags = 0;
+			DECR_CQCOUNT(&r_xprt->rx_ep);
+		}
+		rc = ib_bind_mw(ia->ri_id->qp,
+				seg->mr_chunk.rl_mw->r.mw, &param);
+		rpcrdma_unmap_one(ia, seg);
+		}
+		if (rc)
+			dprintk("RPC:       %s: failed ib_(un)bind_mw,"
+				" status %i\n", __func__, rc);
+		else
+			r = NULL;	/* will upcall on completion */
+		break;
+
+	default:
+		rc = ib_dereg_mr(seg1->mr_chunk.rl_mr);
+		seg1->mr_chunk.rl_mr = NULL;
+		while (seg1->mr_nsegs--)
+			rpcrdma_unmap_one(ia, seg++);
+		if (rc)
+			dprintk("RPC:       %s: failed ib_dereg_mr,"
+				" status %i\n", __func__, rc);
+		break;
+	}
+	if (r) {
+		struct rpcrdma_rep *rep = r;
+		void (*func)(struct rpcrdma_rep *) = rep->rr_func;
+		rep->rr_func = NULL;
+		func(rep);	/* dereg done, callback now */
+	}
+	return nsegs;
+}
+
+/*
+ * Prepost any receive buffer, then post send.
+ *
+ * Receive buffer is donated to hardware, reclaimed upon recv completion.
+ */
+int
+rpcrdma_ep_post(struct rpcrdma_ia *ia,
+		struct rpcrdma_ep *ep,
+		struct rpcrdma_req *req)
+{
+	struct ib_send_wr send_wr, *send_wr_fail;
+	struct rpcrdma_rep *rep = req->rl_reply;
+	int rc;
+
+	if (rep) {
+		rc = rpcrdma_ep_post_recv(ia, ep, rep);
+		if (rc)
+			goto out;
+		req->rl_reply = NULL;
+	}
+
+	send_wr.next = NULL;
+	send_wr.wr_id = 0ULL;	/* no send cookie */
+	send_wr.sg_list = req->rl_send_iov;
+	send_wr.num_sge = req->rl_niovs;
+	send_wr.opcode = IB_WR_SEND;
+	send_wr.imm_data = 0;
+	if (send_wr.num_sge == 4)	/* no need to sync any pad (constant) */
+		ib_dma_sync_single_for_device(ia->ri_id->device,
+			req->rl_send_iov[3].addr, req->rl_send_iov[3].length,
+			DMA_TO_DEVICE);
+	ib_dma_sync_single_for_device(ia->ri_id->device,
+		req->rl_send_iov[1].addr, req->rl_send_iov[1].length,
+		DMA_TO_DEVICE);
+	ib_dma_sync_single_for_device(ia->ri_id->device,
+		req->rl_send_iov[0].addr, req->rl_send_iov[0].length,
+		DMA_TO_DEVICE);
+
+	if (DECR_CQCOUNT(ep) > 0)
+		send_wr.send_flags = 0;
+	else { /* Provider must take a send completion every now and then */
+		INIT_CQCOUNT(ep);
+		send_wr.send_flags = IB_SEND_SIGNALED;
+	}
+
+	rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail);
+	if (rc)
+		dprintk("RPC:       %s: ib_post_send returned %i\n", __func__,
+			rc);
+out:
+	return rc;
+}
+
+/*
+ * (Re)post a receive buffer.
+ */
+int
+rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
+		     struct rpcrdma_ep *ep,
+		     struct rpcrdma_rep *rep)
+{
+	struct ib_recv_wr recv_wr, *recv_wr_fail;
+	int rc;
+
+	recv_wr.next = NULL;
+	recv_wr.wr_id = (u64) (unsigned long) rep;
+	recv_wr.sg_list = &rep->rr_iov;
+	recv_wr.num_sge = 1;
+
+	ib_dma_sync_single_for_cpu(ia->ri_id->device,
+		rep->rr_iov.addr, rep->rr_iov.length, DMA_BIDIRECTIONAL);
+
+	DECR_CQCOUNT(ep);
+	rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail);
+
+	if (rc)
+		dprintk("RPC:       %s: ib_post_recv returned %i\n", __func__,
+			rc);
+	return rc;
+}

net/sunrpc/xprtrdma/xprt_rdma.h

···
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_SUNRPC_XPRT_RDMA_H
+#define _LINUX_SUNRPC_XPRT_RDMA_H
+
+#include <linux/wait.h> 		/* wait_queue_head_t, etc */
+#include <linux/spinlock.h> 		/* spinlock_t, etc */
+#include <asm/atomic.h>			/* atomic_t, etc */
+
+#include <rdma/rdma_cm.h>		/* RDMA connection api */
+#include <rdma/ib_verbs.h>		/* RDMA verbs api */
+
+#include <linux/sunrpc/clnt.h> 		/* rpc_xprt */
+#include <linux/sunrpc/rpc_rdma.h> 	/* RPC/RDMA protocol */
+#include <linux/sunrpc/xprtrdma.h> 	/* xprt parameters */
+
+/*
+ * Interface Adapter -- one per transport instance
+ */
+struct rpcrdma_ia {
+	struct rdma_cm_id 	*ri_id;
+	struct ib_pd		*ri_pd;
+	struct ib_mr		*ri_bind_mem;
+	struct completion	ri_done;
+	int			ri_async_rc;
+	enum rpcrdma_memreg	ri_memreg_strategy;
+};
+
+/*
+ * RDMA Endpoint -- one per transport instance
+ */
+
+struct rpcrdma_ep {
+	atomic_t		rep_cqcount;
+	int			rep_cqinit;
+	int			rep_connected;
+	struct rpcrdma_ia	*rep_ia;
+	struct ib_cq		*rep_cq;
+	struct ib_qp_init_attr	rep_attr;
+	wait_queue_head_t 	rep_connect_wait;
+	struct ib_sge		rep_pad;	/* holds zeroed pad */
+	struct ib_mr		*rep_pad_mr;	/* holds zeroed pad */
+	void			(*rep_func)(struct rpcrdma_ep *);
+	struct rpc_xprt		*rep_xprt;	/* for rep_func */
+	struct rdma_conn_param	rep_remote_cma;
+	struct sockaddr_storage	rep_remote_addr;
+};
+
+#define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit)
+#define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount)
+
+/*
+ * struct rpcrdma_rep -- this structure encapsulates state required to recv
+ * and complete a reply, asychronously. It needs several pieces of
+ * state:
+ *   o recv buffer (posted to provider)
+ *   o ib_sge (also donated to provider)
+ *   o status of reply (length, success or not)
+ *   o bookkeeping state to get run by tasklet (list, etc)
+ *
+ * These are allocated during initialization, per-transport instance;
+ * however, the tasklet execution list itself is global, as it should
+ * always be pretty short.
+ *
+ * N of these are associated with a transport instance, and stored in
+ * struct rpcrdma_buffer. N is the max number of outstanding requests.
+ */
+
+/* temporary static scatter/gather max */
+#define RPCRDMA_MAX_DATA_SEGS	(8)	/* max scatter/gather */
+#define RPCRDMA_MAX_SEGS 	(RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */
+#define MAX_RPCRDMAHDR	(\
+	/* max supported RPC/RDMA header */ \
+	sizeof(struct rpcrdma_msg) + (2 * sizeof(u32)) + \
+	(sizeof(struct rpcrdma_read_chunk) * RPCRDMA_MAX_SEGS) + sizeof(u32))
+
+struct rpcrdma_buffer;
+
+struct rpcrdma_rep {
+	unsigned int	rr_len;		/* actual received reply length */
+	struct rpcrdma_buffer *rr_buffer; /* home base for this structure */
+	struct rpc_xprt	*rr_xprt;	/* needed for request/reply matching */
+	void (*rr_func)(struct rpcrdma_rep *);/* called by tasklet in softint */
+	struct list_head rr_list;	/* tasklet list */
+	wait_queue_head_t rr_unbind;	/* optional unbind wait */
+	struct ib_sge	rr_iov;		/* for posting */
+	struct ib_mr	*rr_handle;	/* handle for mem in rr_iov */
+	char	rr_base[MAX_RPCRDMAHDR]; /* minimal inline receive buffer */
+};
+
+/*
+ * struct rpcrdma_req -- structure central to the request/reply sequence.
+ *
+ * N of these are associated with a transport instance, and stored in
+ * struct rpcrdma_buffer. N is the max number of outstanding requests.
+ *
+ * It includes pre-registered buffer memory for send AND recv.
+ * The recv buffer, however, is not owned by this structure, and
+ * is "donated" to the hardware when a recv is posted. When a
+ * reply is handled, the recv buffer used is given back to the
+ * struct rpcrdma_req associated with the request.
+ *
+ * In addition to the basic memory, this structure includes an array
+ * of iovs for send operations. The reason is that the iovs passed to
+ * ib_post_{send,recv} must not be modified until the work request
+ * completes.
+ *
+ * NOTES:
+ *   o RPCRDMA_MAX_SEGS is the max number of addressible chunk elements we
+ *     marshal. The number needed varies depending on the iov lists that
+ *     are passed to us, the memory registration mode we are in, and if
+ *     physical addressing is used, the layout.
+ */
+
+struct rpcrdma_mr_seg {		/* chunk descriptors */
+	union {				/* chunk memory handles */
+		struct ib_mr	*rl_mr;		/* if registered directly */
+		struct rpcrdma_mw {		/* if registered from region */
+			union {
+				struct ib_mw	*mw;
+				struct ib_fmr	*fmr;
+			} r;
+			struct list_head mw_list;
+		} *rl_mw;
+	} mr_chunk;
+	u64		mr_base;	/* registration result */
+	u32		mr_rkey;	/* registration result */
+	u32		mr_len;		/* length of chunk or segment */
+	int		mr_nsegs;	/* number of segments in chunk or 0 */
+	enum dma_data_direction	mr_dir;	/* segment mapping direction */
+	dma_addr_t	mr_dma;		/* segment mapping address */
+	size_t		mr_dmalen;	/* segment mapping length */
+	struct page	*mr_page;	/* owning page, if any */
+	char		*mr_offset;	/* kva if no page, else offset */
+};
+
+struct rpcrdma_req {
+	size_t 		rl_size;	/* actual length of buffer */
+	unsigned int	rl_niovs;	/* 0, 2 or 4 */
+	unsigned int	rl_nchunks;	/* non-zero if chunks */
+	struct rpcrdma_buffer *rl_buffer; /* home base for this structure */
+	struct rpcrdma_rep	*rl_reply;/* holder for reply buffer */
+	struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];/* chunk segments */
+	struct ib_sge	rl_send_iov[4];	/* for active requests */
+	struct ib_sge	rl_iov;		/* for posting */
+	struct ib_mr	*rl_handle;	/* handle for mem in rl_iov */
+	char		rl_base[MAX_RPCRDMAHDR]; /* start of actual buffer */
+	__u32 		rl_xdr_buf[0];	/* start of returned rpc rq_buffer */
+};
+#define rpcr_to_rdmar(r) \
+	container_of((r)->rq_buffer, struct rpcrdma_req, rl_xdr_buf[0])
+
+/*
+ * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
+ * inline requests/replies, and client/server credits.
+ *
+ * One of these is associated with a transport instance
+ */
+struct rpcrdma_buffer {
+	spinlock_t	rb_lock;	/* protects indexes */
+	atomic_t	rb_credits;	/* most recent server credits */
+	unsigned long	rb_cwndscale;	/* cached framework rpc_cwndscale */
+	int		rb_max_requests;/* client max requests */
+	struct list_head rb_mws;	/* optional memory windows/fmrs */
+	int		rb_send_index;
+	struct rpcrdma_req	**rb_send_bufs;
+	int		rb_recv_index;
+	struct rpcrdma_rep	**rb_recv_bufs;
+	char		*rb_pool;
+};
+#define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
+
+/*
+ * Internal structure for transport instance creation. This
+ * exists primarily for modularity.
+ *
+ * This data should be set with mount options
+ */
+struct rpcrdma_create_data_internal {
+	struct sockaddr_storage	addr;	/* RDMA server address */
+	unsigned int	max_requests;	/* max requests (slots) in flight */
+	unsigned int	rsize;		/* mount rsize - max read hdr+data */
+	unsigned int	wsize;		/* mount wsize - max write hdr+data */
+	unsigned int	inline_rsize;	/* max non-rdma read data payload */
+	unsigned int	inline_wsize;	/* max non-rdma write data payload */
+	unsigned int	padding;	/* non-rdma write header padding */
+};
+
+#define RPCRDMA_INLINE_READ_THRESHOLD(rq) \
+	(rpcx_to_rdmad(rq->rq_task->tk_xprt).inline_rsize)
+
+#define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\
+	(rpcx_to_rdmad(rq->rq_task->tk_xprt).inline_wsize)
+
+#define RPCRDMA_INLINE_PAD_VALUE(rq)\
+	rpcx_to_rdmad(rq->rq_task->tk_xprt).padding
+
+/*
+ * Statistics for RPCRDMA
+ */
+struct rpcrdma_stats {
+	unsigned long		read_chunk_count;
+	unsigned long		write_chunk_count;
+	unsigned long		reply_chunk_count;
+
+	unsigned long long	total_rdma_request;
+	unsigned long long	total_rdma_reply;
+
+	unsigned long long	pullup_copy_count;
+	unsigned long long	fixup_copy_count;
+	unsigned long		hardway_register_count;
+	unsigned long		failed_marshal_count;
+	unsigned long		bad_reply_count;
+};
+
+/*
+ * RPCRDMA transport -- encapsulates the structures above for
+ * integration with RPC.
+ *
+ * The contained structures are embedded, not pointers,
+ * for convenience. This structure need not be visible externally.
+ *
+ * It is allocated and initialized during mount, and released
+ * during unmount.
+ */
+struct rpcrdma_xprt {
+	struct rpc_xprt		xprt;
+	struct rpcrdma_ia	rx_ia;
+	struct rpcrdma_ep	rx_ep;
+	struct rpcrdma_buffer	rx_buf;
+	struct rpcrdma_create_data_internal rx_data;
+	struct delayed_work	rdma_connect;
+	struct rpcrdma_stats	rx_stats;
+};
+
+#define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, xprt)
+#define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data)
+
+/*
+ * Interface Adapter calls - xprtrdma/verbs.c
+ */
+int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int);
+void rpcrdma_ia_close(struct rpcrdma_ia *);
+
+/*
+ * Endpoint calls - xprtrdma/verbs.c
+ */
+int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *,
+				struct rpcrdma_create_data_internal *);
+int rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *);
+int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
+int rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
+
+int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
+				struct rpcrdma_req *);
+int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *,
+				struct rpcrdma_rep *);
+
+/*
+ * Buffer calls - xprtrdma/verbs.c
+ */
+int rpcrdma_buffer_create(struct rpcrdma_buffer *, struct rpcrdma_ep *,
+				struct rpcrdma_ia *,
+				struct rpcrdma_create_data_internal *);
+void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
+
+struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
+void rpcrdma_buffer_put(struct rpcrdma_req *);
+void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
+void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
+
+int rpcrdma_register_internal(struct rpcrdma_ia *, void *, int,
+				struct ib_mr **, struct ib_sge *);
+int rpcrdma_deregister_internal(struct rpcrdma_ia *,
+				struct ib_mr *, struct ib_sge *);
+
+int rpcrdma_register_external(struct rpcrdma_mr_seg *,
+				int, int, struct rpcrdma_xprt *);
+int rpcrdma_deregister_external(struct rpcrdma_mr_seg *,
+				struct rpcrdma_xprt *, void *);
+
+/*
+ * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c
+ */
+void rpcrdma_conn_func(struct rpcrdma_ep *);
+void rpcrdma_reply_handler(struct rpcrdma_rep *);
+
+/*
+ * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
+ */
+int rpcrdma_marshal_req(struct rpc_rqst *);
+
+#endif				/* _LINUX_SUNRPC_XPRT_RDMA_H */

net/sunrpc/xprtsock.c

···
  *  (C) 1999 Trond Myklebust <[e-mail]>
  *
  * IP socket transport implementation, (C) 2005 Chuck Lever <[e-mail]>
+ *
+ * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
+ *   <[e-mail]>
  */
 
 #include <linux/types.h>
 #include <linux/slab.h>
+#include <linux/module.h>
 #include <linux/capability.h>
 #include <linux/pagemap.h>
 #include <linux/errno.h>
···
 #include <linux/tcp.h>
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/xprtsock.h>
 #include <linux/file.h>
 
 #include <net/sock.h>
···
 #define TCP_RCV_COPY_XID	(1UL << 2)
 #define TCP_RCV_COPY_DATA	(1UL << 3)
 
-static void xs_format_peer_addresses(struct rpc_xprt *xprt)
+static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
 {
-	struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr;
+	return (struct sockaddr *) &xprt->addr;
+}
+
+static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
+{
+	return (struct sockaddr_in *) &xprt->addr;
+}
+
+static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
+{
+	return (struct sockaddr_in6 *) &xprt->addr;
+}
+
+static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt)
+{
+	struct sockaddr_in *addr = xs_addr_in(xprt);
 	char *buf;
 
 	buf = kzalloc(20, GFP_KERNEL);
 	if (buf) {
-		snprintf(buf, 20, "%u.%u.%u.%u",
+		snprintf(buf, 20, NIPQUAD_FMT,
 				NIPQUAD(addr->sin_addr.s_addr));
 	}
 	xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
···
 	}
 	xprt->address_strings[RPC_DISPLAY_PORT] = buf;
 
-	if (xprt->prot == IPPROTO_UDP)
-		xprt->address_strings[RPC_DISPLAY_PROTO] = "udp";
-	else
-		xprt->address_strings[RPC_DISPLAY_PROTO] = "tcp";
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf) {
+		if (xprt->prot == IPPROTO_UDP)
+			snprintf(buf, 8, "udp");
+		else
+			snprintf(buf, 8, "tcp");
+	}
+	xprt->address_strings[RPC_DISPLAY_PROTO] = buf;
 
 	buf = kzalloc(48, GFP_KERNEL);
 	if (buf) {
-		snprintf(buf, 48, "addr=%u.%u.%u.%u port=%u proto=%s",
+		snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
 			NIPQUAD(addr->sin_addr.s_addr),
 			ntohs(addr->sin_port),
 			xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
 	}
 	xprt->address_strings[RPC_DISPLAY_ALL] = buf;
+
+	buf = kzalloc(10, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 10, "%02x%02x%02x%02x",
+				NIPQUAD(addr->sin_addr.s_addr));
+	}
+	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
+
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 8, "%4hx",
+				ntohs(addr->sin_port));
+	}
+	xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
+
+	buf = kzalloc(30, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
+				NIPQUAD(addr->sin_addr.s_addr),
+				ntohs(addr->sin_port) >> 8,
+				ntohs(addr->sin_port) & 0xff);
+	}
+	xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
+
+	xprt->address_strings[RPC_DISPLAY_NETID] =
+		kstrdup(xprt->prot == IPPROTO_UDP ?
+			RPCBIND_NETID_UDP : RPCBIND_NETID_TCP, GFP_KERNEL);
+}
+
+static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt)
+{
+	struct sockaddr_in6 *addr = xs_addr_in6(xprt);
+	char *buf;
+
+	buf = kzalloc(40, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 40, NIP6_FMT,
+				NIP6(addr->sin6_addr));
+	}
+	xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
+
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 8, "%u",
+				ntohs(addr->sin6_port));
+	}
+	xprt->address_strings[RPC_DISPLAY_PORT] = buf;
+
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf) {
+		if (xprt->prot == IPPROTO_UDP)
+			snprintf(buf, 8, "udp");
+		else
+			snprintf(buf, 8, "tcp");
+	}
+	xprt->address_strings[RPC_DISPLAY_PROTO] = buf;
+
+	buf = kzalloc(64, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
+				NIP6(addr->sin6_addr),
+				ntohs(addr->sin6_port),
+				xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
+	}
+	xprt->address_strings[RPC_DISPLAY_ALL] = buf;
+
+	buf = kzalloc(36, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 36, NIP6_SEQFMT,
+				NIP6(addr->sin6_addr));
+	}
+	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
+
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 8, "%4hx",
+				ntohs(addr->sin6_port));
+	}
+	xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
+
+	buf = kzalloc(50, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 50, NIP6_FMT".%u.%u",
+				NIP6(addr->sin6_addr),
+				ntohs(addr->sin6_port) >> 8,
+				ntohs(addr->sin6_port) & 0xff);
+	}
+	xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
+
+	xprt->address_strings[RPC_DISPLAY_NETID] =
+		kstrdup(xprt->prot == IPPROTO_UDP ?
+			RPCBIND_NETID_UDP6 : RPCBIND_NETID_TCP6, GFP_KERNEL);
 }
 
 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
 {
-	kfree(xprt->address_strings[RPC_DISPLAY_ADDR]);
-	kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
-	kfree(xprt->address_strings[RPC_DISPLAY_ALL]);
+	int i;
+
+	for (i = 0; i < RPC_DISPLAY_MAX; i++)
+		kfree(xprt->address_strings[i]);
 }
 
 #define XS_SENDMSG_FLAGS	(MSG_DONTWAIT | MSG_NOSIGNAL)
···
 
 	req->rq_xtime = jiffies;
 	status = xs_sendpages(transport->sock,
-			      (struct sockaddr *) &xprt->addr,
+			      xs_addr(xprt),
 			      xprt->addrlen, xdr,
 			      req->rq_bytes_sent);
 
 	dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
 			xdr->len - req->rq_bytes_sent, status);
 
-	if (likely(status >= (int) req->rq_slen))
-		return 0;
-
-	/* Still some bytes left; set up for a retry later. */
-	if (status > 0)
+	if (status >= 0) {
+		task->tk_bytes_sent += status;
+		if (status >= req->rq_slen)
+			return 0;
+		/* Still some bytes left; set up for a retry later. */
 		status = -EAGAIN;
+	}
 
 	switch (status) {
 	case -ENETUNREACH:
···
 	struct rpc_xprt *xprt = req->rq_xprt;
 	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 	struct xdr_buf *xdr = &req->rq_snd_buf;
-	int status, retry = 0;
+	int status;
+	unsigned int retry = 0;
 
 	xs_encode_tcp_record_marker(&req->rq_snd_buf);
 
···
 	xs_free_peer_addresses(xprt);
 	kfree(xprt->slot);
 	kfree(xprt);
+	module_put(THIS_MODULE);
 }
 
 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
···
  */
 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
 {
-	struct sockaddr_in *sap = (struct sockaddr_in *) &xprt->addr;
+	struct sockaddr *addr = xs_addr(xprt);
 
 	dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
 
-	sap->sin_port = htons(port);
+	switch (addr->sa_family) {
+	case AF_INET:
+		((struct sockaddr_in *)addr)->sin_port = htons(port);
+		break;
+	case AF_INET6:
+		((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
+		break;
+	default:
+		BUG();
+	}
 }
 
-static int xs_bind(struct sock_xprt *transport, struct socket *sock)
+static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
 {
 	struct sockaddr_in myaddr = {
 		.sin_family = AF_INET,
···
 		else
 			port--;
 	} while (err == -EADDRINUSE && port != transport->port);
-	dprintk("RPC:       xs_bind "NIPQUAD_FMT":%u: %s (%d)\n",
-		NIPQUAD(myaddr.sin_addr), port, err ? "failed" : "ok", err);
+	dprintk("RPC:       %s "NIPQUAD_FMT":%u: %s (%d)\n",
+			__FUNCTION__, NIPQUAD(myaddr.sin_addr),
+			port, err ? "failed" : "ok", err);
+	return err;
+}
+
+static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
+{
+	struct sockaddr_in6 myaddr = {
+		.sin6_family = AF_INET6,
+	};
+	struct sockaddr_in6 *sa;
+	int err;
+	unsigned short port = transport->port;
+
+	if (!transport->xprt.resvport)
+		port = 0;
+	sa = (struct sockaddr_in6 *)&transport->addr;
+	myaddr.sin6_addr = sa->sin6_addr;
+	do {
+		myaddr.sin6_port = htons(port);
+		err = kernel_bind(sock, (struct sockaddr *) &myaddr,
+						sizeof(myaddr));
+		if (!transport->xprt.resvport)
+			break;
+		if (err == 0) {
+			transport->port = port;
+			break;
+		}
+		if (port <= xprt_min_resvport)
+			port = xprt_max_resvport;
+		else
+			port--;
+	} while (err == -EADDRINUSE && port != transport->port);
+	dprintk("RPC:       xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
+		NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
 	return err;
 }
 
···
 static struct lock_class_key xs_key[2];
 static struct lock_class_key xs_slock_key[2];
 
-static inline void xs_reclassify_socket(struct socket *sock)
+static inline void xs_reclassify_socket4(struct socket *sock)
 {
 	struct sock *sk = sock->sk;
+
 	BUG_ON(sock_owned_by_user(sk));
-	switch (sk->sk_family) {
-	case AF_INET:
-		sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS",
-			&xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]);
-		break;
+	sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
+		&xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
+}
 
-	case AF_INET6:
-		sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS",
-			&xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]);
-		break;
+static inline void xs_reclassify_socket6(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
 
-	default:
-		BUG();
-	}
+	BUG_ON(sock_owned_by_user(sk));
+	sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
+		&xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
 }
 #else
-static inline void xs_reclassify_socket(struct socket *sock)
+static inline void xs_reclassify_socket4(struct socket *sock)
+{
+}
+
+static inline void xs_reclassify_socket6(struct socket *sock)
 {
 }
 #endif
 
-/**
- * xs_udp_connect_worker - set up a UDP socket
- * @work: RPC transport to connect
- *
- * Invoked by a work queue tasklet.
- */
-static void xs_udp_connect_worker(struct work_struct *work)
+static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
 {
-	struct sock_xprt *transport =
-		container_of(work, struct sock_xprt, connect_worker.work);
-	struct rpc_xprt *xprt = &transport->xprt;
-	struct socket *sock = transport->sock;
-	int err, status = -EIO;
-
-	if (xprt->shutdown || !xprt_bound(xprt))
-		goto out;
-
-	/* Start by resetting any existing state */
-	xs_close(xprt);
-
-	if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
-		dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
-		goto out;
-	}
-	xs_reclassify_socket(sock);
-
-	if (xs_bind(transport, sock)) {
-		sock_release(sock);
-		goto out;
-	}
-
-	dprintk("RPC:       worker connecting xprt %p to address: %s\n",
-			xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 
 	if (!transport->inet) {
 		struct sock *sk = sock->sk;
···
 		write_unlock_bh(&sk->sk_callback_lock);
 	}
 	xs_udp_do_set_buffer_size(xprt);
+}
+
+/**
+ * xs_udp_connect_worker4 - set up a UDP socket
+ * @work: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_udp_connect_worker4(struct work_struct *work)
+{
+	struct sock_xprt *transport =
+		container_of(work, struct sock_xprt, connect_worker.work);
+	struct rpc_xprt *xprt = &transport->xprt;
+	struct socket *sock = transport->sock;
+	int err, status = -EIO;
+
+	if (xprt->shutdown || !xprt_bound(xprt))
+		goto out;
+
+	/* Start by resetting any existing state */
+	xs_close(xprt);
+
+	if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
+		dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
+		goto out;
+	}
+	xs_reclassify_socket4(sock);
+
+	if (xs_bind4(transport, sock)) {
+		sock_release(sock);
+		goto out;
+	}
+
+	dprintk("RPC:       worker connecting xprt %p to address: %s\n",
+			xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
+
+	xs_udp_finish_connecting(xprt, sock);
+	status = 0;
+out:
+	xprt_wake_pending_tasks(xprt, status);
+	xprt_clear_connecting(xprt);
+}
+
+/**
+ * xs_udp_connect_worker6 - set up a UDP socket
+ * @work: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_udp_connect_worker6(struct work_struct *work)
+{
+	struct sock_xprt *transport =
+		container_of(work, struct sock_xprt, connect_worker.work);
+	struct rpc_xprt *xprt = &transport->xprt;
+	struct socket *sock = transport->sock;
+	int err, status = -EIO;
+
+	if (xprt->shutdown || !xprt_bound(xprt))
+		goto out;
+
+	/* Start by resetting any existing state */
+	xs_close(xprt);
+
+	if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
+		dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
+		goto out;
+	}
+	xs_reclassify_socket6(sock);
+
+	if (xs_bind6(transport, sock) < 0) {
+		sock_release(sock);
+		goto out;
+	}
+
+	dprintk("RPC:       worker connecting xprt %p to address: %s\n",
+			xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
+
+	xs_udp_finish_connecting(xprt, sock);
 	status = 0;
 out:
 	xprt_wake_pending_tasks(xprt, status);
···
 				result);
 }
 
-/**
- * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
- * @work: RPC transport to connect
- *
- * Invoked by a work queue tasklet.
- */
-static void xs_tcp_connect_worker(struct work_struct *work)
+static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
 {
-	struct sock_xprt *transport =
-		container_of(work, struct sock_xprt, connect_worker.work);
-	struct rpc_xprt *xprt = &transport->xprt;
-	struct socket *sock = transport->sock;
-	int err, status = -EIO;
-
-	if (xprt->shutdown || !xprt_bound(xprt))
-		goto out;
-
-	if (!sock) {
-		/* start from scratch */
-		if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
-			dprintk("RPC:       can't create TCP transport "
-					"socket (%d).\n", -err);
-			goto out;
-		}
-		xs_reclassify_socket(sock);
-
-		if (xs_bind(transport, sock)) {
-			sock_release(sock);
-			goto out;
-		}
-	} else
-		/* "close" the socket, preserving the local port */
-		xs_tcp_reuse_connection(xprt);
-
-	dprintk("RPC:       worker connecting xprt %p to address: %s\n",
-			xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 
 	if (!transport->inet) {
 		struct sock *sk = sock->sk;
···
 	/* Tell the socket layer to start connecting... */
 	xprt->stat.connect_count++;
 	xprt->stat.connect_start = jiffies;
-	status = kernel_connect(sock, (struct sockaddr *) &xprt->addr,
-			xprt->addrlen, O_NONBLOCK);
+	return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
+}
+
+/**
+ * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
+ * @work: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_tcp_connect_worker4(struct work_struct *work)
+{
+	struct sock_xprt *transport =
+		container_of(work, struct sock_xprt, connect_worker.work);
+	struct rpc_xprt *xprt = &transport->xprt;
+	struct socket *sock = transport->sock;
+	int err, status = -EIO;
+
+	if (xprt->shutdown || !xprt_bound(xprt))
+		goto out;
+
+	if (!sock) {
+		/* start from scratch */
+		if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
+			dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
+			goto out;
+		}
+		xs_reclassify_socket4(sock);
+
+		if (xs_bind4(transport, sock) < 0) {
+			sock_release(sock);
+			goto out;
+		}
+	} else
+		/* "close" the socket, preserving the local port */
+		xs_tcp_reuse_connection(xprt);
+
+	dprintk("RPC:       worker connecting xprt %p to address: %s\n",
+			xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
+
+	status = xs_tcp_finish_connecting(xprt, sock);
 	dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
 			xprt, -status, xprt_connected(xprt),
 			sock->sk->sk_state);
+	if (status < 0) {
+		switch (status) {
+			case -EINPROGRESS:
+			case -EALREADY:
+				goto out_clear;
+			case -ECONNREFUSED:
+			case -ECONNRESET:
+				/* retry with existing socket, after a delay */
+				break;
+			default:
+				/* get rid of existing socket, and retry */
+				xs_close(xprt);
+				break;
+		}
+	}
+out:
+	xprt_wake_pending_tasks(xprt, status);
+out_clear:
+	xprt_clear_connecting(xprt);
+}
+
+/**
+ * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
+ * @work: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_tcp_connect_worker6(struct work_struct *work)
+{
+	struct sock_xprt *transport =
+		container_of(work, struct sock_xprt, connect_worker.work);
+	struct rpc_xprt *xprt = &transport->xprt;
+	struct socket *sock = transport->sock;
+	int err, status = -EIO;
+
+	if (xprt->shutdown || !xprt_bound(xprt))
+		goto out;
+
+	if (!sock) {
+		/* start from scratch */
+		if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
+			dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
+			goto out;
+		}
+		xs_reclassify_socket6(sock);
+
+		if (xs_bind6(transport, sock) < 0) {
+			sock_release(sock);
+			goto out;
+		}
+	} else
+		/* "close" the socket, preserving the local port */
+		xs_tcp_reuse_connection(xprt);
+
+	dprintk("RPC:       worker connecting xprt %p to address: %s\n",
+			xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
+
+	status = xs_tcp_finish_connecting(xprt, sock);
+	dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
+			xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
 	if (status < 0) {
 		switch (status) {
 			case -EINPROGRESS:
···
 	.print_stats		= xs_tcp_print_stats,
 };
 
-static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args, unsigned int slot_table_size)
+static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
+				      unsigned int slot_table_size)
 {
 	struct rpc_xprt *xprt;
 	struct sock_xprt *new;
···
  * @args: rpc transport creation arguments
  *
  */
-struct rpc_xprt *xs_setup_udp(struct rpc_xprtsock_create *args)
+struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
 {
+	struct sockaddr *addr = args->dstaddr;
 	struct rpc_xprt *xprt;
 	struct sock_xprt *transport;
 
···
 		return xprt;
 	transport = container_of(xprt, struct sock_xprt, xprt);
 
-	if (ntohs(((struct sockaddr_in *)args->dstaddr)->sin_port) != 0)
-		xprt_set_bound(xprt);
-
 	xprt->prot = IPPROTO_UDP;
 	xprt->tsh_size = 0;
 	/* XXX: header size can vary due to auth type, IPv6, etc. */
 	xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
 
-	INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_connect_worker);
 	xprt->bind_timeout = XS_BIND_TO;
 	xprt->connect_timeout = XS_UDP_CONN_TO;
 	xprt->reestablish_timeout = XS_UDP_REEST_TO;
···
 	else
 		xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
 
-	xs_format_peer_addresses(xprt);
+	switch (addr->sa_family) {
+	case AF_INET:
+		if (((struct sockaddr_in *)addr)->sin_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker,
+					xs_udp_connect_worker4);
+		xs_format_ipv4_peer_addresses(xprt);
+		break;
+	case AF_INET6:
+		if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker,
+					xs_udp_connect_worker6);
+		xs_format_ipv6_peer_addresses(xprt);
+		break;
+	default:
+		kfree(xprt);
+		return ERR_PTR(-EAFNOSUPPORT);
+	}
+
 	dprintk("RPC:       set up transport to address %s\n",
 			xprt->address_strings[RPC_DISPLAY_ALL]);
 
-	return xprt;
+	if (try_module_get(THIS_MODULE))
+		return xprt;
+
+	kfree(xprt->slot);
+	kfree(xprt);
+	return ERR_PTR(-EINVAL);
 }
 
 /**
···
  * @args: rpc transport creation arguments
  *
  */
-struct rpc_xprt *xs_setup_tcp(struct rpc_xprtsock_create *args)
+struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
 {
+	struct sockaddr *addr = args->dstaddr;
 	struct rpc_xprt *xprt;
 	struct sock_xprt *transport;
 
···
 		return xprt;
 	transport = container_of(xprt, struct sock_xprt, xprt);
 
-	if (ntohs(((struct sockaddr_in *)args->dstaddr)->sin_port) != 0)
-		xprt_set_bound(xprt);
-
 	xprt->prot = IPPROTO_TCP;
 	xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
 	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
 
-	INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker);
 	xprt->bind_timeout = XS_BIND_TO;
 	xprt->connect_timeout = XS_TCP_CONN_TO;
 	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
···
 	else
 		xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
 
-	xs_format_peer_addresses(xprt);
+	switch (addr->sa_family) {
+	case AF_INET:
+		if (((struct sockaddr_in *)addr)->sin_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
+		xs_format_ipv4_peer_addresses(xprt);
+		break;
+	case AF_INET6:
+		if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
+		xs_format_ipv6_peer_addresses(xprt);
+		break;
+	default:
+		kfree(xprt);
+		return ERR_PTR(-EAFNOSUPPORT);
+	}
+
 	dprintk("RPC:       set up transport to address %s\n",
 			xprt->address_strings[RPC_DISPLAY_ALL]);
 
-	return xprt;
+	if (try_module_get(THIS_MODULE))
+		return xprt;
+
+	kfree(xprt->slot);
+	kfree(xprt);
+	return ERR_PTR(-EINVAL);
 }
 
+static struct xprt_class	xs_udp_transport = {
+	.list		= LIST_HEAD_INIT(xs_udp_transport.list),
+	.name		= "udp",
+	.owner		= THIS_MODULE,
+	.ident		= IPPROTO_UDP,
+	.setup		= xs_setup_udp,
+};
+
+static struct xprt_class	xs_tcp_transport = {
+	.list		= LIST_HEAD_INIT(xs_tcp_transport.list),
+	.name		= "tcp",
+	.owner		= THIS_MODULE,
+	.ident		= IPPROTO_TCP,
+	.setup		= xs_setup_tcp,
+};
+
 /**
- * init_socket_xprt - set up xprtsock's sysctls
+ * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
  *
  */
 int init_socket_xprt(void)
···
 		sunrpc_table_header = register_sysctl_table(sunrpc_table);
 #endif
 
+	xprt_register_transport(&xs_udp_transport);
+	xprt_register_transport(&xs_tcp_transport);
+
 	return 0;
 }
 
 /**
- * cleanup_socket_xprt - remove xprtsock's sysctls
+ * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
  *
  */
 void cleanup_socket_xprt(void)
···
 		sunrpc_table_header = NULL;
 	}
 #endif
+
+	xprt_unregister_transport(&xs_udp_transport);
+	xprt_unregister_transport(&xs_tcp_transport);
 }