Merge branch 'nfs-for-3.2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

* 'nfs-for-3.2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (26 commits)
Check validity of cl_rpcclient in nfs_server_list_show
NFS: Get rid of the nfs_rdata_mempool
NFS: Don't rely on PageError in nfs_readpage_release_partial
NFS: Get rid of unnecessary calls to ClearPageError() in read code
NFS: Get rid of nfs_restart_rpc()
NFS: Get rid of the unused nfs_write_data->flags field
NFS: Get rid of the unused nfs_read_data->flags field
NFSv4: Translate NFS4ERR_BADNAME into ENOENT when applied to a lookup
NFS: Remove the unused "lookupfh()" version of nfs4_proc_lookup()
NFS: Use the inode->i_version to cache NFSv4 change attribute information
SUNRPC: Remove unnecessary export of rpc_sockaddr2uaddr
SUNRPC: Fix rpc_sockaddr2uaddr
nfs/super.c: local functions should be static
pnfsblock: fix writeback deadlock
pnfsblock: fix NULL pointer dereference
pnfs: recoalesce when ld read pagelist fails
pnfs: recoalesce when ld write pagelist fails
pnfs: make _set_lo_fail generic
pnfsblock: add missing rpc_put_mount and path_put
SUNRPC/NFS: make rpc pipe upcall generic
...

fs/nfs/blocklayout/blocklayout.c

···
 	return bio;
 }
 
-static void bl_set_lo_fail(struct pnfs_layout_segment *lseg)
-{
-	if (lseg->pls_range.iomode == IOMODE_RW) {
-		dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__);
-		set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
-	} else {
-		dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__);
-		set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
-	}
-}
-
 /* This is basically copied from mpage_end_io_read */
 static void bl_end_io_read(struct bio *bio, int err)
 {
···
 	if (!uptodate) {
 		if (!rdata->pnfs_error)
 			rdata->pnfs_error = -EIO;
-		bl_set_lo_fail(rdata->lseg);
+		pnfs_set_lo_fail(rdata->lseg);
 	}
 	bio_put(bio);
 	put_parallel(par);
···
 						 bl_end_io_read, par);
 			if (IS_ERR(bio)) {
 				rdata->pnfs_error = PTR_ERR(bio);
+				bio = NULL;
 				goto out;
 			}
 		}
···
 	if (!uptodate) {
 		if (!wdata->pnfs_error)
 			wdata->pnfs_error = -EIO;
-		bl_set_lo_fail(wdata->lseg);
+		pnfs_set_lo_fail(wdata->lseg);
 	}
 	bio_put(bio);
 	put_parallel(par);
···
 	if (!uptodate) {
 		if (!wdata->pnfs_error)
 			wdata->pnfs_error = -EIO;
-		bl_set_lo_fail(wdata->lseg);
+		pnfs_set_lo_fail(wdata->lseg);
 	}
 	bio_put(bio);
 	put_parallel(par);
···
 fill_invalid_ext:
 		dprintk("%s need to zero %d pages\n", __func__, npg_zero);
 		for (;npg_zero > 0; npg_zero--) {
+			if (bl_is_sector_init(be->be_inval, isect)) {
+				dprintk("isect %llu already init\n",
+					(unsigned long long)isect);
+				goto next_page;
+			}
 			/* page ref released in bl_end_io_write_zero */
 			index = isect >> PAGE_CACHE_SECTOR_SHIFT;
 			dprintk("%s zero %dth page: index %lu isect %llu\n",
···
 			 * PageUptodate: It was read before
 			 * sector_initialized: already written out
 			 */
-			if (PageDirty(page) || PageWriteback(page) ||
-			    bl_is_sector_init(be->be_inval, isect)) {
+			if (PageDirty(page) || PageWriteback(page)) {
 				print_page(page);
 				unlock_page(page);
 				page_cache_release(page);
···
 						 bl_end_io_write_zero, par);
 			if (IS_ERR(bio)) {
 				wdata->pnfs_error = PTR_ERR(bio);
+				bio = NULL;
 				goto out;
 			}
 			/* FIXME: This should be done in bi_end_io */
···
 					 bl_end_io_write, par);
 		if (IS_ERR(bio)) {
 			wdata->pnfs_error = PTR_ERR(bio);
+			bio = NULL;
 			goto out;
 		}
 		isect += PAGE_CACHE_SECTORS;
···
 			struct nfs4_deviceid *d_id)
 {
 	struct pnfs_device *dev;
-	struct pnfs_block_dev *rv = NULL;
+	struct pnfs_block_dev *rv;
 	u32 max_resp_sz;
 	int max_pages;
 	struct page **pages = NULL;
···
 	dev = kmalloc(sizeof(*dev), GFP_NOFS);
 	if (!dev) {
 		dprintk("%s kmalloc failed\n", __func__);
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 	}
 
 	pages = kzalloc(max_pages * sizeof(struct page *), GFP_NOFS);
 	if (pages == NULL) {
 		kfree(dev);
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 	}
 	for (i = 0; i < max_pages; i++) {
 		pages[i] = alloc_page(GFP_NOFS);
-		if (!pages[i])
+		if (!pages[i]) {
+			rv = ERR_PTR(-ENOMEM);
 			goto out_free;
+		}
 	}
 
 	memcpy(&dev->dev_id, d_id, sizeof(*d_id));
···
 	dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data);
 	rc = nfs4_proc_getdeviceinfo(server, dev);
 	dprintk("%s getdevice info returns %d\n", __func__, rc);
-	if (rc)
+	if (rc) {
+		rv = ERR_PTR(rc);
 		goto out_free;
+	}
 
 	rv = nfs4_blk_decode_device(server, dev);
  out_free:
···
 	struct pnfs_devicelist *dlist = NULL;
 	struct pnfs_block_dev *bdev;
 	LIST_HEAD(block_disklist);
-	int status = 0, i;
+	int status, i;
 
 	dprintk("%s enter\n", __func__);
 
···
 		for (i = 0; i < dlist->num_devs; i++) {
 			bdev = nfs4_blk_get_deviceinfo(server, fh,
 						       &dlist->dev_id[i]);
-			if (!bdev) {
-				status = -ENODEV;
+			if (IS_ERR(bdev)) {
+				status = PTR_ERR(bdev);
 				goto out_error;
 			}
 			spin_lock(&b_mt_id->bm_lock);
···
 };
 
 static const struct rpc_pipe_ops bl_upcall_ops = {
-	.upcall		= bl_pipe_upcall,
+	.upcall		= rpc_pipe_generic_upcall,
 	.downcall	= bl_pipe_downcall,
 	.destroy_msg	= bl_pipe_destroy_msg,
 };
···
 			      mnt,
 			      NFS_PIPE_DIRNAME, 0, &path);
 	if (ret)
-		goto out_remove;
+		goto out_putrpc;
 
 	bl_device_pipe = rpc_mkpipe(path.dentry, "blocklayout", NULL,
 				    &bl_upcall_ops, 0);
+	path_put(&path);
 	if (IS_ERR(bl_device_pipe)) {
 		ret = PTR_ERR(bl_device_pipe);
-		goto out_remove;
+		goto out_putrpc;
 	}
 out:
 	return ret;
 
+out_putrpc:
+	rpc_put_mount();
 out_remove:
 	pnfs_unregister_layoutdriver(&blocklayout_type);
 	return ret;
···
 
 	pnfs_unregister_layoutdriver(&blocklayout_type);
 	rpc_unlink(bl_device_pipe);
+	rpc_put_mount();
 }
 
 MODULE_ALIAS("nfs-layouttype4-3");

fs/nfs/blocklayout/blocklayout.h

···
 }
 
 struct bl_dev_msg {
-	int status;
+	int32_t status;
 	uint32_t major, minor;
 };
 
···
 #define BL_DEVICE_REQUEST_ERR          0x2 /* User level process fails */
 
 /* blocklayoutdev.c */
-ssize_t bl_pipe_upcall(struct file *, struct rpc_pipe_msg *,
-		       char __user *, size_t);
 ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t);
 void bl_pipe_destroy_msg(struct rpc_pipe_msg *);
 struct block_device *nfs4_blkdev_get(dev_t dev);

fs/nfs/blocklayout/blocklayoutdev.c

···
 	return blkdev_put(bdev, FMODE_READ);
 }
 
-/*
- * Shouldn't there be a rpc_generic_upcall() to do this for us?
- */
-ssize_t bl_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
-		       char __user *dst, size_t buflen)
-{
-	char *data = (char *)msg->data + msg->copied;
-	size_t mlen = min(msg->len - msg->copied, buflen);
-	unsigned long left;
-
-	left = copy_to_user(dst, data, mlen);
-	if (left == mlen) {
-		msg->errno = -EFAULT;
-		return -EFAULT;
-	}
-
-	mlen -= left;
-	msg->copied += mlen;
-	msg->errno = 0;
-	return mlen;
-}
-
 static struct bl_dev_msg bl_mount_reply;
 
 ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
···
 nfs4_blk_decode_device(struct nfs_server *server,
 		       struct pnfs_device *dev)
 {
-	struct pnfs_block_dev *rv = NULL;
+	struct pnfs_block_dev *rv;
 	struct block_device *bd = NULL;
 	struct rpc_pipe_msg msg;
 	struct bl_msg_hdr bl_msg = {
···
 	uint8_t *dataptr;
 	DECLARE_WAITQUEUE(wq, current);
 	struct bl_dev_msg *reply = &bl_mount_reply;
-	int offset, len, i;
+	int offset, len, i, rc;
 
 	dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
 	dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
···
 
 	dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
 	add_wait_queue(&bl_wq, &wq);
-	if (rpc_queue_upcall(bl_device_pipe->d_inode, &msg) < 0) {
+	rc = rpc_queue_upcall(bl_device_pipe->d_inode, &msg);
+	if (rc < 0) {
 		remove_wait_queue(&bl_wq, &wq);
+		rv = ERR_PTR(rc);
 		goto out;
 	}
 
···
 
 	bd = nfs4_blkdev_get(MKDEV(reply->major, reply->minor));
 	if (IS_ERR(bd)) {
-		dprintk("%s failed to open device : %ld\n",
-			__func__, PTR_ERR(bd));
+		rc = PTR_ERR(bd);
+		dprintk("%s failed to open device : %d\n", __func__, rc);
+		rv = ERR_PTR(rc);
 		goto out;
 	}
 

fs/nfs/client.c

···
 	/* display one transport per line on subsequent lines */
 	clp = list_entry(v, struct nfs_client, cl_share_link);
 
+	/* Check if the client is initialized */
+	if (clp->cl_cons_state != NFS_CS_READY)
+		return 0;
+
 	seq_printf(m, "v%u %s %s %3d %s\n",
 		   clp->rpc_ops->version,
 		   rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),

fs/nfs/delegation.c

···
 			sizeof(delegation->stateid.data));
 	delegation->type = res->delegation_type;
 	delegation->maxsize = res->maxsize;
-	delegation->change_attr = nfsi->change_attr;
+	delegation->change_attr = inode->i_version;
 	delegation->cred = get_rpccred(cred);
 	delegation->inode = inode;
 	delegation->flags = 1<<NFS_DELEGATION_REFERENCED;

fs/nfs/fscache-index.c

···
 	auxdata.ctime = nfsi->vfs_inode.i_ctime;
 
 	if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
-		auxdata.change_attr = nfsi->change_attr;
+		auxdata.change_attr = nfsi->vfs_inode.i_version;
 
 	if (bufmax > sizeof(auxdata))
 		bufmax = sizeof(auxdata);
···
 	auxdata.ctime = nfsi->vfs_inode.i_ctime;
 
 	if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
-		auxdata.change_attr = nfsi->change_attr;
+		auxdata.change_attr = nfsi->vfs_inode.i_version;
 
 	if (memcmp(data, &auxdata, datalen) != 0)
 		return FSCACHE_CHECKAUX_OBSOLETE;

fs/nfs/idmap.c

···
 	struct idmap_hashtable	idmap_group_hash;
 };
 
-static ssize_t idmap_pipe_upcall(struct file *, struct rpc_pipe_msg *,
-				 char __user *, size_t);
 static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
 				   size_t);
 static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
···
 static unsigned int fnvhash32(const void *, size_t);
 
 static const struct rpc_pipe_ops idmap_upcall_ops = {
-	.upcall		= idmap_pipe_upcall,
+	.upcall		= rpc_pipe_generic_upcall,
 	.downcall	= idmap_pipe_downcall,
 	.destroy_msg	= idmap_pipe_destroy_msg,
 };
···
 	mutex_unlock(&idmap->idmap_im_lock);
 	mutex_unlock(&idmap->idmap_lock);
 	return ret;
-}
-
-/* RPC pipefs upcall/downcall routines */
-static ssize_t
-idmap_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
-		  char __user *dst, size_t buflen)
-{
-	char *data = (char *)msg->data + msg->copied;
-	size_t mlen = min(msg->len, buflen);
-	unsigned long left;
-
-	left = copy_to_user(dst, data, mlen);
-	if (left == mlen) {
-		msg->errno = -EFAULT;
-		return -EFAULT;
-	}
-
-	mlen -= left;
-	msg->copied += mlen;
-	msg->errno = 0;
-	return mlen;
 }
 
 static ssize_t

fs/nfs/inode.c

···
 		memset(&inode->i_atime, 0, sizeof(inode->i_atime));
 		memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
 		memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
-		nfsi->change_attr = 0;
+		inode->i_version = 0;
 		inode->i_size = 0;
 		inode->i_nlink = 0;
 		inode->i_uid = -2;
···
 				| NFS_INO_INVALID_ACCESS
 				| NFS_INO_INVALID_ACL;
 		if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
-			nfsi->change_attr = fattr->change_attr;
+			inode->i_version = fattr->change_attr;
 		else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
 			nfsi->cache_validity |= NFS_INO_INVALID_ATTR
 				| NFS_INO_INVALID_DATA;
···
 
 	if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
 			&& (fattr->valid & NFS_ATTR_FATTR_CHANGE)
-			&& nfsi->change_attr == fattr->pre_change_attr) {
-		nfsi->change_attr = fattr->change_attr;
+			&& inode->i_version == fattr->pre_change_attr) {
+		inode->i_version = fattr->change_attr;
 		if (S_ISDIR(inode->i_mode))
 			nfsi->cache_validity |= NFS_INO_INVALID_DATA;
 		ret |= NFS_INO_INVALID_ATTR;
···
 		return -EIO;
 
 	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
-			nfsi->change_attr != fattr->change_attr)
+			inode->i_version != fattr->change_attr)
 		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
 
 	/* Verify a few of the more important attributes */
···
 	}
 	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
 			(fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
-		fattr->pre_change_attr = NFS_I(inode)->change_attr;
+		fattr->pre_change_attr = inode->i_version;
 		fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
 	}
 	if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
···
 
 	/* More cache consistency checks */
 	if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
-		if (nfsi->change_attr != fattr->change_attr) {
+		if (inode->i_version != 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;
 			if (S_ISDIR(inode->i_mode))
 				nfs_force_lookup_revalidate(inode);
-			nfsi->change_attr = fattr->change_attr;
+			inode->i_version = fattr->change_attr;
 		}
 	} else if (server->caps & NFS_CAP_CHANGE_ATTR)
 		invalid |= save_cache_validity;

fs/nfs/internal.h

···
 		PAGE_SIZE - 1) >> PAGE_SHIFT;
 }
 
-/*
- * Helper for restarting RPC calls in the possible presence of NFSv4.1
- * sessions.
- */
-static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
-{
-	if (nfs4_has_session(clp))
-		return rpc_restart_call_prepare(task);
-	return rpc_restart_call(task);
-}

fs/nfs/nfs4filelayout.c

···
 	BUG();
 }
 
-/* For data server errors we don't recover from */
-static void
-filelayout_set_lo_fail(struct pnfs_layout_segment *lseg)
-{
-	if (lseg->pls_range.iomode == IOMODE_RW) {
-		dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__);
-		set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
-	} else {
-		dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__);
-		set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
-	}
-}
-
 static int filelayout_async_handle_error(struct rpc_task *task,
 					 struct nfs4_state *state,
 					 struct nfs_client *clp,
···
 static int filelayout_read_done_cb(struct rpc_task *task,
 				struct nfs_read_data *data)
 {
-	struct nfs_client *clp = data->ds_clp;
 	int reset = 0;
 
 	dprintk("%s DS read\n", __func__);
···
 		dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
 			__func__, data->ds_clp, data->ds_clp->cl_session);
 		if (reset) {
-			filelayout_set_lo_fail(data->lseg);
+			pnfs_set_lo_fail(data->lseg);
 			nfs4_reset_read(task, data);
-			clp = NFS_SERVER(data->inode)->nfs_client;
 		}
-		nfs_restart_rpc(task, clp);
+		rpc_restart_call_prepare(task);
 		return -EAGAIN;
 	}
 
···
 
 	if (filelayout_async_handle_error(task, data->args.context->state,
 					  data->ds_clp, &reset) == -EAGAIN) {
-		struct nfs_client *clp;
-
 		dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
 			__func__, data->ds_clp, data->ds_clp->cl_session);
 		if (reset) {
-			filelayout_set_lo_fail(data->lseg);
+			pnfs_set_lo_fail(data->lseg);
 			nfs4_reset_write(task, data);
-			clp = NFS_SERVER(data->inode)->nfs_client;
-		} else
-			clp = data->ds_clp;
-		nfs_restart_rpc(task, clp);
+		}
+		rpc_restart_call_prepare(task);
 		return -EAGAIN;
 	}
 
···
 			__func__, data->ds_clp, data->ds_clp->cl_session);
 		if (reset) {
 			prepare_to_resend_writes(data);
-			filelayout_set_lo_fail(data->lseg);
+			pnfs_set_lo_fail(data->lseg);
 		} else
-			nfs_restart_rpc(task, data->ds_clp);
+			rpc_restart_call_prepare(task);
 		return -EAGAIN;
 	}
 

fs/nfs/nfs4proc.c

···
 static int _nfs4_recover_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 *, struct nfs4_state *);
-static int _nfs4_proc_lookup(struct rpc_clnt *client, 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);
 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
 			    struct nfs_fattr *fattr, struct iattr *sattr,
···
 
 	spin_lock(&dir->i_lock);
 	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
-	if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
+	if (!cinfo->atomic || cinfo->before != dir->i_version)
 		nfs_force_lookup_revalidate(dir);
-	nfsi->change_attr = cinfo->after;
+	dir->i_version = cinfo->after;
 	spin_unlock(&dir->i_lock);
 }
 
···
 	int status;
 
 	status = nfs4_run_open_task(data, 0);
-	if (status != 0 || !data->rpc_done)
+	if (!data->rpc_done)
 		return status;
+	if (status != 0) {
+		if (status == -NFS4ERR_BADNAME &&
+				!(o_arg->open_flags & O_CREAT))
+			return -ENOENT;
+		return status;
+	}
 
 	if (o_arg->open_flags & O_CREAT) {
 		update_changeattr(dir, &o_res->cinfo);
···
 	return status;
 }
 
-static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
-		const struct nfs_fh *dirfh, const struct qstr *name,
-		struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
+		const struct qstr *name, struct nfs_fh *fhandle,
+		struct nfs_fattr *fattr)
 {
+	struct nfs_server *server = NFS_SERVER(dir);
 	int		       status;
 	struct nfs4_lookup_arg args = {
 		.bitmask = server->attr_bitmask,
-		.dir_fh = dirfh,
+		.dir_fh = NFS_FH(dir),
 		.name = name,
 	};
 	struct nfs4_lookup_res res = {
···
 
 	nfs_fattr_init(fattr);
 
-	dprintk("NFS call  lookupfh %s\n", name->name);
-	status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
-	dprintk("NFS reply lookupfh: %d\n", status);
-	return status;
-}
-
-static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
-			      struct qstr *name, struct nfs_fh *fhandle,
-			      struct nfs_fattr *fattr)
-{
-	struct nfs4_exception exception = { };
-	int err;
-	do {
-		err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
-		/* FIXME: !!!! */
-		if (err == -NFS4ERR_MOVED) {
-			err = -EREMOTE;
-			break;
-		}
-		err = nfs4_handle_exception(server, err, &exception);
-	} while (exception.retry);
-	return err;
-}
-
-static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
-		const struct qstr *name, struct nfs_fh *fhandle,
-		struct nfs_fattr *fattr)
-{
-	int status;
-	
 	dprintk("NFS call  lookup %s\n", name->name);
-	status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
-	if (status == -NFS4ERR_MOVED)
-		status = nfs4_get_referral(dir, name, fattr, fhandle);
+	status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
 	dprintk("NFS reply lookup: %d\n", status);
 	return status;
 }
···
 	struct nfs4_exception exception = { };
 	int err;
 	do {
-		err = nfs4_handle_exception(NFS_SERVER(dir),
-				_nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
-				&exception);
-		if (err == -EPERM)
+		int status;
+
+		status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
+		switch (status) {
+		case -NFS4ERR_BADNAME:
+			return -ENOENT;
+		case -NFS4ERR_MOVED:
+			err = nfs4_get_referral(dir, name, fattr, fhandle);
+			break;
+		case -NFS4ERR_WRONGSEC:
 			nfs_fixup_secinfo_attributes(fattr, fhandle);
+		}
+		err = nfs4_handle_exception(NFS_SERVER(dir),
+				status, &exception);
 	} while (exception.retry);
 	return err;
 }
···
 	struct nfs_server *server = NFS_SERVER(data->inode);
 
 	if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
-		nfs_restart_rpc(task, server->nfs_client);
+		rpc_restart_call_prepare(task);
 		return -EAGAIN;
 	}
 
···
 	struct inode *inode = data->inode;
 	
 	if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
-		nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
+		rpc_restart_call_prepare(task);
 		return -EAGAIN;
 	}
 	if (task->tk_status >= 0) {
···
 	struct inode *inode = data->inode;
 
 	if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
-		nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
+		rpc_restart_call_prepare(task);
 		return -EAGAIN;
 	}
 	nfs_refresh_inode(inode, data->res.fattr);
···
 	default:
 		if (nfs4_async_handle_error(task, data->res.server, NULL) ==
 				-EAGAIN) {
-			nfs_restart_rpc(task, data->res.server->nfs_client);
+			rpc_restart_call_prepare(task);
 			return;
 		}
 	}
···
 			break;
 		default:
 			if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
-				nfs_restart_rpc(task,
-						 calldata->server->nfs_client);
+				rpc_restart_call_prepare(task);
 	}
 }
 
···
 		task->tk_status = 0;
 		/* fall through */
 	case -NFS4ERR_RETRY_UNCACHED_REP:
-		nfs_restart_rpc(task, data->clp);
+		rpc_restart_call_prepare(task);
 		return;
 	}
 	dprintk("<-- %s\n", __func__);
···
 
 	server = NFS_SERVER(lrp->args.inode);
 	if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
-		nfs_restart_rpc(task, lrp->clp);
+		rpc_restart_call_prepare(task);
 		return;
 	}
 	spin_lock(&lo->plh_inode->i_lock);
···
 	}
 
 	if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
-		nfs_restart_rpc(task, server->nfs_client);
+		rpc_restart_call_prepare(task);
 		return;
 	}
 
···
 	.getroot	= nfs4_proc_get_root,
 	.getattr	= nfs4_proc_getattr,
 	.setattr	= nfs4_proc_setattr,
-	.lookupfh	= nfs4_proc_lookupfh,
 	.lookup		= nfs4_proc_lookup,
 	.access		= nfs4_proc_access,
 	.readlink	= nfs4_proc_readlink,

fs/nfs/pnfs.c

···
 /*
  * Called by non rpc-based layout drivers
  */
-int
-pnfs_ld_write_done(struct nfs_write_data *data)
+void pnfs_ld_write_done(struct nfs_write_data *data)
 {
-	int status;
-
-	if (!data->pnfs_error) {
+	if (likely(!data->pnfs_error)) {
 		pnfs_set_layoutcommit(data);
 		data->mds_ops->rpc_call_done(&data->task, data);
-		data->mds_ops->rpc_release(data);
-		return 0;
+	} else {
+		put_lseg(data->lseg);
+		data->lseg = NULL;
+		dprintk("pnfs write error = %d\n", data->pnfs_error);
 	}
-
-	dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
-		data->pnfs_error);
-	status = nfs_initiate_write(data, NFS_CLIENT(data->inode),
-				    data->mds_ops, NFS_FILE_SYNC);
-	return status ? : -EAGAIN;
+	data->mds_ops->rpc_release(data);
 }
 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
 
···
 /*
  * Called by non rpc-based layout drivers
  */
-int
-pnfs_ld_read_done(struct nfs_read_data *data)
+void pnfs_ld_read_done(struct nfs_read_data *data)
 {
-	int status;
-
-	if (!data->pnfs_error) {
+	if (likely(!data->pnfs_error)) {
 		__nfs4_read_done_cb(data);
 		data->mds_ops->rpc_call_done(&data->task, data);
-		data->mds_ops->rpc_release(data);
-		return 0;
+	} else {
+		put_lseg(data->lseg);
+		data->lseg = NULL;
+		dprintk("pnfs write error = %d\n", data->pnfs_error);
 	}
-
-	dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
-		data->pnfs_error);
-	status = nfs_initiate_read(data, NFS_CLIENT(data->inode),
-				   data->mds_ops);
-	return status ? : -EAGAIN;
+	data->mds_ops->rpc_release(data);
 }
 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
 
···
 			list_add(&lseg->pls_lc_list, listp);
 	}
 }
+
+void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
+{
+	if (lseg->pls_range.iomode == IOMODE_RW) {
+		dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__);
+		set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
+	} else {
+		dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__);
+		set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
+	}
+}
+EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
 
 void
 pnfs_set_layoutcommit(struct nfs_write_data *wdata)

fs/nfs/pnfs.h

···
 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *, struct nfs_page *);
 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
+void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 int pnfs_layout_process(struct nfs4_layoutget *lgp);
 void pnfs_free_lseg_list(struct list_head *tmp_list);
 void pnfs_destroy_layout(struct nfs_inode *);
···
 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 int _pnfs_return_layout(struct inode *);
-int pnfs_ld_write_done(struct nfs_write_data *);
-int pnfs_ld_read_done(struct nfs_read_data *);
+void pnfs_ld_write_done(struct nfs_write_data *);
+void pnfs_ld_read_done(struct nfs_read_data *);
 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 					       struct nfs_open_context *ctx,
 					       loff_t pos,

fs/nfs/read.c

···
 static const struct rpc_call_ops nfs_read_full_ops;
 
 static struct kmem_cache *nfs_rdata_cachep;
-static mempool_t *nfs_rdata_mempool;
-
-#define MIN_POOL_READ	(32)
 
 struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount)
 {
-	struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, GFP_KERNEL);
+	struct nfs_read_data *p;
 
+	p = kmem_cache_zalloc(nfs_rdata_cachep, GFP_KERNEL);
 	if (p) {
-		memset(p, 0, sizeof(*p));
 		INIT_LIST_HEAD(&p->pages);
 		p->npages = pagecount;
 		if (pagecount <= ARRAY_SIZE(p->page_array))
···
 		else {
 			p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL);
 			if (!p->pagevec) {
-				mempool_free(p, nfs_rdata_mempool);
+				kmem_cache_free(nfs_rdata_cachep, p);
 				p = NULL;
 			}
 		}
···
 {
 	if (p && (p->pagevec != &p->page_array[0]))
 		kfree(p->pagevec);
-	mempool_free(p, nfs_rdata_mempool);
+	kmem_cache_free(nfs_rdata_cachep, p);
 }
 
 void nfs_readdata_release(struct nfs_read_data *rdata)
···
 	while (!list_empty(head)) {
 		req = nfs_list_entry(head->next);
 		nfs_list_remove_request(req);
-		SetPageError(req->wb_page);
 		nfs_readpage_release(req);
 	}
 }
···
 		offset += len;
 	} while(nbytes != 0);
 	atomic_set(&req->wb_complete, requests);
-	ClearPageError(page);
 	desc->pg_rpc_callops = &nfs_read_partial_ops;
 	return ret;
 out_bad:
···
 		list_del(&data->list);
 		nfs_readdata_free(data);
 	}
-	SetPageError(page);
 	nfs_readpage_release(req);
 	return -ENOMEM;
 }
···
 		req = nfs_list_entry(head->next);
 		nfs_list_remove_request(req);
 		nfs_list_add_request(req, &data->pages);
-		ClearPageError(req->wb_page);
 		*pages++ = req->wb_page;
 	}
 	req = nfs_list_entry(data->pages.next);
···
 	argp->offset += resp->count;
 	argp->pgbase += resp->count;
 	argp->count -= resp->count;
-	nfs_restart_rpc(task, NFS_SERVER(data->inode)->nfs_client);
+	rpc_restart_call_prepare(task);
 }
 
 /*
···
 	int status = data->task.tk_status;
 
 	if (status < 0)
-		SetPageError(page);
+		set_bit(PG_PARTIAL_READ_FAILED, &req->wb_flags);
 
 	if (atomic_dec_and_test(&req->wb_complete)) {
-		if (!PageError(page))
+		if (!test_bit(PG_PARTIAL_READ_FAILED, &req->wb_flags))
 			SetPageUptodate(page);
 		nfs_readpage_release(req);
 	}
···
 static void nfs_readpage_release_full(void *calldata)
 {
 	struct nfs_read_data *data = calldata;
+	struct nfs_pageio_descriptor pgio;
 
+	if (data->pnfs_error) {
+		nfs_pageio_init_read_mds(&pgio, data->inode);
+		pgio.pg_recoalesce = 1;
+	}
 	while (!list_empty(&data->pages)) {
 		struct nfs_page *req = nfs_list_entry(data->pages.next);
 
 		nfs_list_remove_request(req);
-		nfs_readpage_release(req);
+		if (!data->pnfs_error)
+			nfs_readpage_release(req);
+		else
+			nfs_pageio_add_request(&pgio, req);
 	}
+	if (data->pnfs_error)
+		nfs_pageio_complete(&pgio);
 	nfs_readdata_release(calldata);
 }
 
···
 	return 0;
 out_error:
 	error = PTR_ERR(new);
-	SetPageError(page);
 out_unlock:
 	unlock_page(page);
 	return error;
···
 	if (nfs_rdata_cachep == NULL)
 		return -ENOMEM;
 
-	nfs_rdata_mempool = mempool_create_slab_pool(MIN_POOL_READ,
-						     nfs_rdata_cachep);
-	if (nfs_rdata_mempool == NULL)
-		return -ENOMEM;
-
 	return 0;
 }
 
 void nfs_destroy_readpagecache(void)
 {
-	mempool_destroy(nfs_rdata_mempool);
 	kmem_cache_destroy(nfs_rdata_cachep);
 }

fs/nfs/super.c

···
 
 	return 0;
 }
+
+#ifdef CONFIG_NFS_V4
 #ifdef CONFIG_NFS_V4_1
-void show_sessions(struct seq_file *m, struct nfs_server *server)
+static void show_sessions(struct seq_file *m, struct nfs_server *server)
 {
 	if (nfs4_has_session(server->nfs_client))
 		seq_printf(m, ",sessions");
 }
 #else
-void show_sessions(struct seq_file *m, struct nfs_server *server) {}
+static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
+#endif
 #endif
 
+#ifdef CONFIG_NFS_V4
 #ifdef CONFIG_NFS_V4_1
-void show_pnfs(struct seq_file *m, struct nfs_server *server)
+static void show_pnfs(struct seq_file *m, struct nfs_server *server)
 {
 	seq_printf(m, ",pnfs=");
 	if (server->pnfs_curr_ld)
···
 	else
 		seq_printf(m, "not configured");
 }
-#else  /* CONFIG_NFS_V4_1 */
-void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
-#endif /* CONFIG_NFS_V4_1 */
+#else
+static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
+#endif
+#endif
 
 static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
 {

fs/nfs/unlink.c

···
 	struct inode *dir = data->dir;
 
 	if (!NFS_PROTO(dir)->unlink_done(task, dir))
-		nfs_restart_rpc(task, NFS_SERVER(dir)->nfs_client);
+		rpc_restart_call_prepare(task);
 }
 
 /**
···
 	struct dentry *new_dentry = data->new_dentry;
 
 	if (!NFS_PROTO(old_dir)->rename_done(task, old_dir, new_dir)) {
-		nfs_restart_rpc(task, NFS_SERVER(old_dir)->nfs_client);
+		rpc_restart_call_prepare(task);
 		return;
 	}
 

fs/nfs/write.c

···
 	error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req);
 	BUG_ON(error);
 	if (!nfsi->npages && nfs_have_delegation(inode, FMODE_WRITE))
-		nfsi->change_attr++;
+		inode->i_version++;
 	set_bit(PG_MAPPED, &req->wb_flags);
 	SetPagePrivate(req->wb_page);
 	set_page_private(req->wb_page, (unsigned long)req);
···
 nfs_mark_request_dirty(struct nfs_page *req)
 {
 	__set_page_dirty_nobuffers(req->wb_page);
-	__mark_inode_dirty(req->wb_page->mapping->host, I_DIRTY_DATASYNC);
 }
 
 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
···
 	status = nfs_writepage_setup(ctx, page, offset, count);
 	if (status < 0)
 		nfs_set_pageerror(page);
+	else
+		__set_page_dirty_nobuffers(page);
 
 	dprintk("NFS:       nfs_updatepage returns %d (isize %lld)\n",
 			status, (long long)i_size_read(inode));
···
 		req = nfs_list_entry(head->next);
 		nfs_list_remove_request(req);
 		nfs_list_add_request(req, &data->pages);
-		ClearPageError(req->wb_page);
 		*pages++ = req->wb_page;
 	}
 	req = nfs_list_entry(data->pages.next);
···
 static void nfs_writeback_release_full(void *calldata)
 {
 	struct nfs_write_data	*data = calldata;
-	int status = data->task.tk_status;
+	int ret, status = data->task.tk_status;
+	struct nfs_pageio_descriptor pgio;
+
+	if (data->pnfs_error) {
+		nfs_pageio_init_write_mds(&pgio, data->inode, FLUSH_STABLE);
+		pgio.pg_recoalesce = 1;
+	}
 
 	/* Update attributes as result of writeback. */
 	while (!list_empty(&data->pages)) {
···
 			(long long)NFS_FILEID(req->wb_context->dentry->d_inode),
 			req->wb_bytes,
 			(long long)req_offset(req));
+
+		if (data->pnfs_error) {
+			dprintk(", pnfs error = %d\n", data->pnfs_error);
+			goto next;
+		}
 
 		if (status < 0) {
 			nfs_set_pageerror(page);
···
 	next:
 		nfs_clear_page_tag_locked(req);
 		nfs_end_page_writeback(page);
+		if (data->pnfs_error) {
+			lock_page(page);
+			nfs_pageio_cond_complete(&pgio, page->index);
+			ret = nfs_page_async_flush(&pgio, page, 0);
+			if (ret) {
+				nfs_set_pageerror(page);
+				dprintk("rewrite to MDS error = %d\n", ret);
+			}
+			unlock_page(page);
+		}
 	}
+	if (data->pnfs_error)
+		nfs_pageio_complete(&pgio);
 	nfs_writedata_release(calldata);
 }
 
···
 				 */
 				argp->stable = NFS_FILE_SYNC;
 			}
-			nfs_restart_rpc(task, server->nfs_client);
+			rpc_restart_call_prepare(task);
 			return;
 		}
 		if (time_before(complain, jiffies)) {
···
 	int flags = FLUSH_SYNC;
 	int ret = 0;
 
+	/* no commits means nothing needs to be done */
+	if (!nfsi->ncommit)
+		return ret;
+
 	if (wbc->sync_mode == WB_SYNC_NONE) {
 		/* Don't commit yet if this is a non-blocking flush and there
 		 * are a lot of outstanding writes for this mapping.
···
 int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
 		struct page *page)
 {
-	struct nfs_page *req;
-	int ret;
+	/*
+	 * If PagePrivate is set, then the page is currently associated with
+	 * an in-progress read or write request. Don't try to migrate it.
+	 *
+	 * FIXME: we could do this in principle, but we'll need a way to ensure
+	 *        that we can safely release the inode reference while holding
+	 *        the page lock.
+	 */
+	if (PagePrivate(page))
+		return -EBUSY;
 
 	nfs_fscache_release_page(page, GFP_KERNEL);
 
-	req = nfs_find_and_lock_request(page, false);
-	ret = PTR_ERR(req);
-	if (IS_ERR(req))
-		goto out;
-
-	ret = migrate_page(mapping, newpage, page);
-	if (!req)
-		goto out;
-	if (ret)
-		goto out_unlock;
-	page_cache_get(newpage);
-	spin_lock(&mapping->host->i_lock);
-	req->wb_page = newpage;
-	SetPagePrivate(newpage);
-	set_page_private(newpage, (unsigned long)req);
-	ClearPagePrivate(page);
-	set_page_private(page, 0);
-	spin_unlock(&mapping->host->i_lock);
-	page_cache_release(page);
-out_unlock:
-	nfs_clear_page_tag_locked(req);
-out:
-	return ret;
+	return migrate_page(mapping, newpage, page);
 }
 #endif
 

include/linux/nfs_fs.h

···
 	unsigned long		read_cache_jiffies;
 	unsigned long		attrtimeo;
 	unsigned long		attrtimeo_timestamp;
-	__u64			change_attr;		/* v4 only */
 
 	unsigned long		attr_gencount;
 	/* "Generation counter" for the attribute cache. This is

include/linux/nfs_page.h

···
 	PG_NEED_COMMIT,
 	PG_NEED_RESCHED,
 	PG_PNFS_COMMIT,
+	PG_PARTIAL_READ_FAILED,
 };
 
 struct nfs_inode;

include/linux/nfs_xdr.h

···
 #define NFS_PAGEVEC_SIZE	(8U)
 
 struct nfs_read_data {
-	int			flags;
 	struct rpc_task		task;
 	struct inode		*inode;
 	struct rpc_cred		*cred;
···
 };
 
 struct nfs_write_data {
-	int			flags;
 	struct rpc_task		task;
 	struct inode		*inode;
 	struct rpc_cred		*cred;
···
 
 	int	(*getroot) (struct nfs_server *, struct nfs_fh *,
 			    struct nfs_fsinfo *);
-	int	(*lookupfh)(struct nfs_server *, struct nfs_fh *,
-			    struct qstr *, struct nfs_fh *,
-			    struct nfs_fattr *);
 	int	(*getattr) (struct nfs_server *, struct nfs_fh *,
 			    struct nfs_fattr *);
 	int	(*setattr) (struct dentry *, struct nfs_fattr *,

include/linux/sunrpc/clnt.h

···
 #ifndef _LINUX_SUNRPC_CLNT_H
 #define _LINUX_SUNRPC_CLNT_H
 
+#include <linux/types.h>
 #include <linux/socket.h>
 #include <linux/in.h>
 #include <linux/in6.h>
···
 size_t		rpc_ntop(const struct sockaddr *, char *, const size_t);
 size_t		rpc_pton(const char *, const size_t,
 			 struct sockaddr *, const size_t);
-char *		rpc_sockaddr2uaddr(const struct sockaddr *);
+char *		rpc_sockaddr2uaddr(const struct sockaddr *, gfp_t);
 size_t		rpc_uaddr2sockaddr(const char *, const size_t,
 				   struct sockaddr *, const size_t);
 

include/linux/sunrpc/rpc_pipe_fs.h

···
 	return container_of(inode, struct rpc_inode, vfs_inode);
 }
 
+extern ssize_t rpc_pipe_generic_upcall(struct file *, struct rpc_pipe_msg *,
+				       char __user *, size_t);
 extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *);
 
 struct rpc_clnt;

net/sunrpc/addr.c

···
 /**
  * rpc_sockaddr2uaddr - Construct a universal address string from @sap.
  * @sap: socket address
+ * @gfp_flags: allocation mode
  *
  * Returns a %NUL-terminated string in dynamically allocated memory;
  * otherwise NULL is returned if an error occurred.  Caller must
  * free the returned string.
  */
-char *rpc_sockaddr2uaddr(const struct sockaddr *sap)
+char *rpc_sockaddr2uaddr(const struct sockaddr *sap, gfp_t gfp_flags)
 {
 	char portbuf[RPCBIND_MAXUADDRPLEN];
 	char addrbuf[RPCBIND_MAXUADDRLEN];
···
 	if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
 		return NULL;
 
-	return kstrdup(addrbuf, GFP_KERNEL);
+	return kstrdup(addrbuf, gfp_flags);
 }
-EXPORT_SYMBOL_GPL(rpc_sockaddr2uaddr);
 
 /**
  * rpc_uaddr2sockaddr - convert a universal address to a socket address.

net/sunrpc/auth_gss/auth_gss.c

···
 	return err;
 }
 
-static ssize_t
-gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
-		char __user *dst, size_t buflen)
-{
-	char *data = (char *)msg->data + msg->copied;
-	size_t mlen = min(msg->len, buflen);
-	unsigned long left;
-
-	left = copy_to_user(dst, data, mlen);
-	if (left == mlen) {
-		msg->errno = -EFAULT;
-		return -EFAULT;
-	}
-
-	mlen -= left;
-	msg->copied += mlen;
-	msg->errno = 0;
-	return mlen;
-}
-
 #define MSG_BUF_MAXSIZE 1024
 
 static ssize_t
···
 };
 
 static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
-	.upcall		= gss_pipe_upcall,
+	.upcall		= rpc_pipe_generic_upcall,
 	.downcall	= gss_pipe_downcall,
 	.destroy_msg	= gss_pipe_destroy_msg,
 	.open_pipe	= gss_pipe_open_v0,
···
 };
 
 static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
-	.upcall		= gss_pipe_upcall,
+	.upcall		= rpc_pipe_generic_upcall,
 	.downcall	= gss_pipe_downcall,
 	.destroy_msg	= gss_pipe_destroy_msg,
 	.open_pipe	= gss_pipe_open_v1,

net/sunrpc/clnt.c

···
 {
 	if (RPC_ASSASSINATED(task))
 		return 0;
-	task->tk_action = rpc_prepare_task;
+	task->tk_action = call_start;
+	if (task->tk_ops->rpc_call_prepare != NULL)
+		task->tk_action = rpc_prepare_task;
 	return 1;
 }
 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);

net/sunrpc/rpc_pipe.c

···
 	rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT);
 }
 
+ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
+				char __user *dst, size_t buflen)
+{
+	char *data = (char *)msg->data + msg->copied;
+	size_t mlen = min(msg->len - msg->copied, buflen);
+	unsigned long left;
+
+	left = copy_to_user(dst, data, mlen);
+	if (left == mlen) {
+		msg->errno = -EFAULT;
+		return -EFAULT;
+	}
+
+	mlen -= left;
+	msg->copied += mlen;
+	msg->errno = 0;
+	return mlen;
+}
+EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall);
+
 /**
  * rpc_queue_upcall - queue an upcall message to userspace
  * @inode: inode of upcall pipe on which to queue given message

net/sunrpc/rpcb_clnt.c

···
 	unsigned short port = ntohs(sin->sin_port);
 	int result;
 
-	map->r_addr = rpc_sockaddr2uaddr(sap);
+	map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
 
 	dprintk("RPC:       %sregistering [%u, %u, %s, '%s'] with "
 		"local rpcbind\n", (port ? "" : "un"),
···
 	unsigned short port = ntohs(sin6->sin6_port);
 	int result;
 
-	map->r_addr = rpc_sockaddr2uaddr(sap);
+	map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
 
 	dprintk("RPC:       %sregistering [%u, %u, %s, '%s'] with "
 		"local rpcbind\n", (port ? "" : "un"),
···
 	case RPCBVERS_4:
 	case RPCBVERS_3:
 		map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
-		map->r_addr = rpc_sockaddr2uaddr(sap);
+		map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
 		map->r_owner = "";
 		break;
 	case RPCBVERS_2: