Merge tag 'nfsd-5.16' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:
"A slow cycle for nfsd: mainly cleanup, including Neil's patch dropping
support for a filehandle format deprecated 20 years ago, and further
xdr-related cleanup from Chuck"

* tag 'nfsd-5.16' of git://linux-nfs.org/~bfields/linux: (26 commits)
nfsd4: remove obselete comment
nfsd: document server-to-server-copy parameters
NFSD:fix boolreturn.cocci warning
nfsd: update create verifier comment
SUNRPC: Change return value type of .pc_encode
SUNRPC: Replace the "__be32 *p" parameter to .pc_encode
NFSD: Save location of NFSv4 COMPOUND status
SUNRPC: Change return value type of .pc_decode
SUNRPC: Replace the "__be32 *p" parameter to .pc_decode
SUNRPC: De-duplicate .pc_release() call sites
SUNRPC: Simplify the SVC dispatch code path
SUNRPC: Capture value of xdr_buf::page_base
SUNRPC: Add trace event when alloc_pages_bulk() makes no progress
svcrdma: Split svcrmda_wc_{read,write} tracepoints
svcrdma: Split the svcrdma_wc_send() tracepoint
svcrdma: Split the svcrdma_wc_receive() tracepoint
NFSD: Have legacy NFSD WRITE decoders use xdr_stream_subsegment()
SUNRPC: xdr_stream_subsegment() must handle non-zero page_bases
NFSD: Initialize pointer ni with NULL and not plain integer 0
NFSD: simplify struct nfsfh
...

Documentation/admin-guide/kernel-parameters.txt

···
 			driver. A non-zero value sets the minimum interval
 			in seconds between layoutstats transmissions.
 
+	nfsd.inter_copy_offload_enable =
+			[NFSv4.2] When set to 1, the server will support
+			server-to-server copies for which this server is
+			the destination of the copy.
+
+	nfsd.nfsd4_ssc_umount_timeout =
+			[NFSv4.2] When used as the destination of a
+			server-to-server copy, knfsd temporarily mounts
+			the source server.  It caches the mount in case
+			it will be needed again, and discards it if not
+			used for the number of milliseconds specified by
+			this parameter.
+
 	nfsd.nfs4_disable_idmapping=
 			[NFSv4] When set to the default of '1', the NFSv4
 			server will return only numeric uids and gids to
 			clients using auth_sys, and will accept numeric uids
 			and gids from such clients.  This is intended to ease
 			migration from NFSv2/v3.
+
 
 	nmi_backtrace.backtrace_idle [KNL]
 			Dump stacks even of idle CPUs in response to an

Documentation/filesystems/nfs/index.rst

···
    rpc-server-gss
    nfs41-server
    knfsd-stats
+   reexport

Documentation/filesystems/nfs/reexport.rst

···
+Reexporting NFS filesystems
+===========================
+
+Overview
+--------
+
+It is possible to reexport an NFS filesystem over NFS.  However, this
+feature comes with a number of limitations.  Before trying it, we
+recommend some careful research to determine whether it will work for
+your purposes.
+
+A discussion of current known limitations follows.
+
+"fsid=" required, crossmnt broken
+---------------------------------
+
+We require the "fsid=" export option on any reexport of an NFS
+filesystem.  You can use "uuidgen -r" to generate a unique argument.
+
+The "crossmnt" export does not propagate "fsid=", so it will not allow
+traversing into further nfs filesystems; if you wish to export nfs
+filesystems mounted under the exported filesystem, you'll need to export
+them explicitly, assigning each its own unique "fsid= option.
+
+Reboot recovery
+---------------
+
+The NFS protocol's normal reboot recovery mechanisms don't work for the
+case when the reexport server reboots.  Clients will lose any locks
+they held before the reboot, and further IO will result in errors.
+Closing and reopening files should clear the errors.
+
+Filehandle limits
+-----------------
+
+If the original server uses an X byte filehandle for a given object, the
+reexport server's filehandle for the reexported object will be X+22
+bytes, rounded up to the nearest multiple of four bytes.
+
+The result must fit into the RFC-mandated filehandle size limits:
+
++-------+-----------+
+| NFSv2 |  32 bytes |
++-------+-----------+
+| NFSv3 |  64 bytes |
++-------+-----------+
+| NFSv4 | 128 bytes |
++-------+-----------+
+
+So, for example, you will only be able to reexport a filesystem over
+NFSv2 if the original server gives you filehandles that fit in 10
+bytes--which is unlikely.
+
+In general there's no way to know the maximum filehandle size given out
+by an NFS server without asking the server vendor.
+
+But the following table gives a few examples.  The first column is the
+typical length of the filehandle from a Linux server exporting the given
+filesystem, the second is the length after that nfs export is reexported
+by another Linux host:
+
++--------+-------------------+----------------+
+|        | filehandle length | after reexport |
++========+===================+================+
+| ext4:  | 28 bytes          | 52 bytes       |
++--------+-------------------+----------------+
+| xfs:   | 32 bytes          | 56 bytes       |
++--------+-------------------+----------------+
+| btrfs: | 40 bytes          | 64 bytes       |
++--------+-------------------+----------------+
+
+All will therefore fit in an NFSv3 or NFSv4 filehandle after reexport,
+but none are reexportable over NFSv2.
+
+Linux server filehandles are a bit more complicated than this, though;
+for example:
+
+        - The (non-default) "subtreecheck" export option generally
+          requires another 4 to 8 bytes in the filehandle.
+        - If you export a subdirectory of a filesystem (instead of
+          exporting the filesystem root), that also usually adds 4 to 8
+          bytes.
+        - If you export over NFSv2, knfsd usually uses a shorter
+          filesystem identifier that saves 8 bytes.
+        - The root directory of an export uses a filehandle that is
+          shorter.
+
+As you can see, the 128-byte NFSv4 filehandle is large enough that
+you're unlikely to have trouble using NFSv4 to reexport any filesystem
+exported from a Linux server.  In general, if the original server is
+something that also supports NFSv3, you're *probably* OK.  Re-exporting
+over NFSv3 may be dicier, and reexporting over NFSv2 will probably
+never work.
+
+For more details of Linux filehandle structure, the best reference is
+the source code and comments; see in particular:
+
+        - include/linux/exportfs.h:enum fid_type
+        - include/uapi/linux/nfsd/nfsfh.h:struct nfs_fhbase_new
+        - fs/nfsd/nfsfh.c:set_version_and_fsid_type
+        - fs/nfs/export.c:nfs_encode_fh
+
+Open DENY bits ignored
+----------------------
+
+NFS since NFSv4 supports ALLOW and DENY bits taken from Windows, which
+allow you, for example, to open a file in a mode which forbids other
+read opens or write opens. The Linux client doesn't use them, and the
+server's support has always been incomplete: they are enforced only
+against other NFS users, not against processes accessing the exported
+filesystem locally. A reexport server will also not pass them along to
+the original server, so they will not be enforced between clients of
+different reexport servers.

fs/lockd/svc.c

···
 static int nlmsvc_dispatch(struct svc_rqst *rqstp, __be32 *statp)
 {
 	const struct svc_procedure *procp = rqstp->rq_procinfo;
-	struct kvec *argv = rqstp->rq_arg.head;
-	struct kvec *resv = rqstp->rq_res.head;
 
 	svcxdr_init_decode(rqstp);
-	if (!procp->pc_decode(rqstp, argv->iov_base))
+	if (!procp->pc_decode(rqstp, &rqstp->rq_arg_stream))
 		goto out_decode_err;
 
 	*statp = procp->pc_func(rqstp);
···
 		return 1;
 
 	svcxdr_init_encode(rqstp);
-	if (!procp->pc_encode(rqstp, resv->iov_base + resv->iov_len))
+	if (!procp->pc_encode(rqstp, &rqstp->rq_res_stream))
 		goto out_encode_err;
 
 	return 1;

fs/lockd/xdr.c

···
  * Decode Call arguments
  */
 
-int
-nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	return 1;
+	return true;
 }
 
-int
-nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	u32 exclusive;
 
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
-		return 0;
+		return false;
 	if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
-		return 0;
+		return false;
 	if (!svcxdr_decode_lock(xdr, &argp->lock))
-		return 0;
+		return false;
 	if (exclusive)
 		argp->lock.fl.fl_type = F_WRLCK;
 
-	return 1;
+	return true;
 }
 
-int
-nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	u32 exclusive;
 
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
-		return 0;
+		return false;
 	if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
-		return 0;
+		return false;
 	if (!svcxdr_decode_lock(xdr, &argp->lock))
-		return 0;
+		return false;
 	if (exclusive)
 		argp->lock.fl.fl_type = F_WRLCK;
 	if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
-		return 0;
+		return false;
 	argp->monitor = 1;		/* monitor client by default */
 
-	return 1;
+	return true;
 }
 
-int
-nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	u32 exclusive;
 
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
-		return 0;
+		return false;
 	if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
-		return 0;
+		return false;
 	if (!svcxdr_decode_lock(xdr, &argp->lock))
-		return 0;
+		return false;
 	if (exclusive)
 		argp->lock.fl.fl_type = F_WRLCK;
 
-	return 1;
+	return true;
 }
 
-int
-nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
-		return 0;
+		return false;
 	if (!svcxdr_decode_lock(xdr, &argp->lock))
-		return 0;
+		return false;
 	argp->lock.fl.fl_type = F_UNLCK;
 
-	return 1;
+	return true;
 }
 
-int
-nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_res *resp = rqstp->rq_argp;
 
 	if (!svcxdr_decode_cookie(xdr, &resp->cookie))
-		return 0;
+		return false;
 	if (!svcxdr_decode_stats(xdr, &resp->status))
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-int
-nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_reboot *argp = rqstp->rq_argp;
+	__be32 *p;
 	u32 len;
 
 	if (xdr_stream_decode_u32(xdr, &len) < 0)
-		return 0;
+		return false;
 	if (len > SM_MAXSTRLEN)
-		return 0;
+		return false;
 	p = xdr_inline_decode(xdr, len);
 	if (!p)
-		return 0;
+		return false;
 	argp->len = len;
 	argp->mon = (char *)p;
 	if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
-		return 0;
+		return false;
 	p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
 	if (!p)
-		return 0;
+		return false;
 	memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
 
-	return 1;
+	return true;
 }
 
-int
-nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	struct nlm_lock	*lock = &argp->lock;
 
···
 	lock->svid = ~(u32)0;
 
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
-		return 0;
+		return false;
 	if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
-		return 0;
+		return false;
 	if (!svcxdr_decode_fhandle(xdr, &lock->fh))
-		return 0;
+		return false;
 	if (!svcxdr_decode_owner(xdr, &lock->oh))
-		return 0;
+		return false;
 	/* XXX: Range checks are missing in the original code */
 	if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-int
-nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	struct nlm_lock	*lock = &argp->lock;
 
 	if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 
···
  * Encode Reply results
  */
 
-int
-nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	return 1;
+	return true;
 }
 
-int
-nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nlm_res *resp = rqstp->rq_resp;
 
 	return svcxdr_encode_cookie(xdr, &resp->cookie) &&
 		svcxdr_encode_testrply(xdr, resp);
 }
 
-int
-nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nlm_res *resp = rqstp->rq_resp;
 
 	return svcxdr_encode_cookie(xdr, &resp->cookie) &&
 		svcxdr_encode_stats(xdr, resp->status);
 }
 
-int
-nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlmsvc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nlm_res *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_cookie(xdr, &resp->cookie))
-		return 0;
+		return false;
 	if (!svcxdr_encode_stats(xdr, resp->status))
-		return 0;
+		return false;
 	/* sequence */
 	if (xdr_stream_encode_u32(xdr, 0) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }

fs/lockd/xdr4.c

···
  * Decode Call arguments
  */
 
-int
-nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	return 1;
+	return true;
 }
 
-int
-nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	u32 exclusive;
 
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
-		return 0;
+		return false;
 	if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
-		return 0;
+		return false;
 	if (!svcxdr_decode_lock(xdr, &argp->lock))
-		return 0;
+		return false;
 	if (exclusive)
 		argp->lock.fl.fl_type = F_WRLCK;
 
-	return 1;
+	return true;
 }
 
-int
-nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	u32 exclusive;
 
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
-		return 0;
+		return false;
 	if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
-		return 0;
+		return false;
 	if (!svcxdr_decode_lock(xdr, &argp->lock))
-		return 0;
+		return false;
 	if (exclusive)
 		argp->lock.fl.fl_type = F_WRLCK;
 	if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
-		return 0;
+		return false;
 	argp->monitor = 1;		/* monitor client by default */
 
-	return 1;
+	return true;
 }
 
-int
-nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	u32 exclusive;
 
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
-		return 0;
+		return false;
 	if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
-		return 0;
+		return false;
 	if (!svcxdr_decode_lock(xdr, &argp->lock))
-		return 0;
+		return false;
 	if (exclusive)
 		argp->lock.fl.fl_type = F_WRLCK;
-	return 1;
+
+	return true;
 }
 
-int
-nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
-		return 0;
+		return false;
 	if (!svcxdr_decode_lock(xdr, &argp->lock))
-		return 0;
+		return false;
 	argp->lock.fl.fl_type = F_UNLCK;
 
-	return 1;
+	return true;
 }
 
-int
-nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_res *resp = rqstp->rq_argp;
 
 	if (!svcxdr_decode_cookie(xdr, &resp->cookie))
-		return 0;
+		return false;
 	if (!svcxdr_decode_stats(xdr, &resp->status))
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-int
-nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_reboot *argp = rqstp->rq_argp;
+	__be32 *p;
 	u32 len;
 
 	if (xdr_stream_decode_u32(xdr, &len) < 0)
-		return 0;
+		return false;
 	if (len > SM_MAXSTRLEN)
-		return 0;
+		return false;
 	p = xdr_inline_decode(xdr, len);
 	if (!p)
-		return 0;
+		return false;
 	argp->len = len;
 	argp->mon = (char *)p;
 	if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
-		return 0;
+		return false;
 	p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
 	if (!p)
-		return 0;
+		return false;
 	memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
 
-	return 1;
+	return true;
 }
 
-int
-nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	struct nlm_lock	*lock = &argp->lock;
 
···
 	lock->svid = ~(u32)0;
 
 	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
-		return 0;
+		return false;
 	if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
-		return 0;
+		return false;
 	if (!svcxdr_decode_fhandle(xdr, &lock->fh))
-		return 0;
+		return false;
 	if (!svcxdr_decode_owner(xdr, &lock->oh))
-		return 0;
+		return false;
 	/* XXX: Range checks are missing in the original code */
 	if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-int
-nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nlm_args *argp = rqstp->rq_argp;
 	struct nlm_lock	*lock = &argp->lock;
 
 	if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 
···
  * Encode Reply results
  */
 
-int
-nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	return 1;
+	return true;
 }
 
-int
-nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nlm_res *resp = rqstp->rq_resp;
 
 	return svcxdr_encode_cookie(xdr, &resp->cookie) &&
 		svcxdr_encode_testrply(xdr, resp);
 }
 
-int
-nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nlm_res *resp = rqstp->rq_resp;
 
 	return svcxdr_encode_cookie(xdr, &resp->cookie) &&
 		svcxdr_encode_stats(xdr, resp->status);
 }
 
-int
-nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nlm4svc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nlm_res *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_cookie(xdr, &resp->cookie))
-		return 0;
+		return false;
 	if (!svcxdr_encode_stats(xdr, resp->status))
-		return 0;
+		return false;
 	/* sequence */
 	if (xdr_stream_encode_u32(xdr, 0) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }

fs/nfs/callback_xdr.c

···
  * svc_process_common() looks for an XDR encoder to know when
  * not to drop a Reply.
  */
-static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p)
+static bool nfs4_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	return xdr_ressize_check(rqstp, p);
+	return true;
 }
 
 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,

fs/nfsd/flexfilelayout.c

···
 		goto out_error;
 
 	fl->fh.size = fhp->fh_handle.fh_size;
-	memcpy(fl->fh.data, &fhp->fh_handle.fh_base, fl->fh.size);
+	memcpy(fl->fh.data, &fhp->fh_handle.fh_raw, fl->fh.size);
 
 	/* Give whole file layout segments */
 	seg->offset = 0;

fs/nfsd/lockd.c

···
 	/* must initialize before using! but maxsize doesn't matter */
 	fh_init(&fh,0);
 	fh.fh_handle.fh_size = f->size;
-	memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
+	memcpy(&fh.fh_handle.fh_raw, f->data, f->size);
 	fh.fh_export = NULL;
 
 	access = (mode == O_WRONLY) ? NFSD_MAY_WRITE : NFSD_MAY_READ;

fs/nfsd/nfs2acl.c

···
  * XDR decode functions
  */
 
-static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
+static bool
+nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_getaclargs *argp = rqstp->rq_argp;
 
 	if (!svcxdr_decode_fhandle(xdr, &argp->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
+static bool
+nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_setaclargs *argp = rqstp->rq_argp;
 
 	if (!svcxdr_decode_fhandle(xdr, &argp->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
-		return 0;
+		return false;
 	if (argp->mask & ~NFS_ACL_MASK)
-		return 0;
+		return false;
 	if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
 				   &argp->acl_access : NULL))
-		return 0;
+		return false;
 	if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
 				   &argp->acl_default : NULL))
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
+static bool
+nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_accessargs *args = rqstp->rq_argp;
 
 	if (!svcxdr_decode_fhandle(xdr, &args->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->access) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 /*
···
  */
 
 /* GETACL */
-static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)
+static bool
+nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_getaclres *resp = rqstp->rq_resp;
 	struct dentry *dentry = resp->fh.fh_dentry;
 	struct inode *inode;
···
 }
 
 /* ACCESS */
-static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
+static bool
+nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_accessres *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_stat(xdr, resp->status))

fs/nfsd/nfs3acl.c

···
  * XDR decode functions
  */
 
-static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
+static bool
+nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_getaclargs *args = rqstp->rq_argp;
 
 	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
+static bool
+nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_setaclargs *argp = rqstp->rq_argp;
 
 	if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
-		return 0;
+		return false;
 	if (argp->mask & ~NFS_ACL_MASK)
-		return 0;
+		return false;
 	if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
 				   &argp->acl_access : NULL))
-		return 0;
+		return false;
 	if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
 				   &argp->acl_default : NULL))
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 /*
···
  */
 
 /* GETACL */
-static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)
+static bool
+nfs3svc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_getaclres *resp = rqstp->rq_resp;
 	struct dentry *dentry = resp->fh.fh_dentry;
 	struct kvec *head = rqstp->rq_res.head;
···
 	int w;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		inode = d_inode(dentry);
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 		if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
-			return 0;
+			return false;
 
 		base = (char *)xdr->p - (char *)head->iov_base;
 
···
 			(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 		while (w > 0) {
 			if (!*(rqstp->rq_next_page++))
-				return 0;
+				return false;
 			w -= PAGE_SIZE;
 		}
 
···
 					  resp->mask & NFS_DFACL,
 					  NFS_ACL_DEFAULT);
 		if (n <= 0)
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 /* SETACL */
-static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p)
+static bool
+nfs3svc_encode_setaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_attrstat *resp = rqstp->rq_resp;
 
 	return svcxdr_encode_nfsstat3(xdr, resp->status) &&

fs/nfsd/nfs3proc.c

···
 
 	fh_copy(&resp->fh, &argp->fh);
 	resp->committed = argp->stable;
-	nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
-				      &argp->first, cnt);
+	nvecs = svc_fill_write_vector(rqstp, &argp->payload);
 	if (!nvecs) {
 		resp->status = nfserr_io;
 		goto out;

fs/nfsd/nfs3xdr.c

···
 		return false;
 	fh_init(fhp, NFS3_FHSIZE);
 	fhp->fh_handle.fh_size = size;
-	memcpy(&fhp->fh_handle.fh_base, p, size);
+	memcpy(&fhp->fh_handle.fh_raw, p, size);
 
 	return true;
 }
···
 	*p++ = cpu_to_be32(size);
 	if (size)
 		p[XDR_QUADLEN(size) - 1] = 0;
-	memcpy(p, &fhp->fh_handle.fh_base, size);
+	memcpy(p, &fhp->fh_handle.fh_raw, size);
 
 	return true;
 }
···
  * XDR decode functions
  */
 
-int
-nfs3svc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_fhandle *args = rqstp->rq_argp;
 
 	return svcxdr_decode_nfs_fh3(xdr, &args->fh);
 }
 
-int
-nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_sattrargs *args = rqstp->rq_argp;
 
 	return svcxdr_decode_nfs_fh3(xdr, &args->fh) &&
···
 		svcxdr_decode_sattrguard3(xdr, args);
 }
 
-int
-nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_diropargs *args = rqstp->rq_argp;
 
 	return svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len);
 }
 
-int
-nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_accessargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_accessargs *args = rqstp->rq_argp;
 
 	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->access) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-int
-nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_readargs *args = rqstp->rq_argp;
 
 	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-int
-nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_writeargs *args = rqstp->rq_argp;
 	u32 max_blocksize = svc_max_payload(rqstp);
-	struct kvec *head = rqstp->rq_arg.head;
-	struct kvec *tail = rqstp->rq_arg.tail;
-	size_t remaining;
 
 	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->stable) < 0)
-		return 0;
+		return false;
 
 	/* opaque data */
 	if (xdr_stream_decode_u32(xdr, &args->len) < 0)
-		return 0;
+		return false;
 
 	/* request sanity */
 	if (args->count != args->len)
-		return 0;
-	remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
-	remaining -= xdr_stream_pos(xdr);
-	if (remaining < xdr_align_size(args->len))
-		return 0;
+		return false;
 	if (args->count > max_blocksize) {
 		args->count = max_blocksize;
 		args->len = max_blocksize;
 	}
+	if (!xdr_stream_subsegment(xdr, &args->payload, args->count))
+		return false;
 
-	args->first.iov_base = xdr->p;
-	args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
-
-	return 1;
+	return true;
 }
 
-int
-nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_createargs *args = rqstp->rq_argp;
 
 	if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->createmode) < 0)
-		return 0;
+		return false;
 	switch (args->createmode) {
 	case NFS3_CREATE_UNCHECKED:
 	case NFS3_CREATE_GUARDED:
···
 	case NFS3_CREATE_EXCLUSIVE:
 		args->verf = xdr_inline_decode(xdr, NFS3_CREATEVERFSIZE);
 		if (!args->verf)
-			return 0;
+			return false;
 		break;
 	default:
-		return 0;
+		return false;
 	}
-	return 1;
+	return true;
 }
 
-int
-nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_createargs *args = rqstp->rq_argp;
 
 	return svcxdr_decode_diropargs3(xdr, &args->fh,
···
 		svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
 }
 
-int
-nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_symlinkargs *args = rqstp->rq_argp;
 	struct kvec *head = rqstp->rq_arg.head;
 	struct kvec *tail = rqstp->rq_arg.tail;
 	size_t remaining;
 
 	if (!svcxdr_decode_diropargs3(xdr, &args->ffh, &args->fname, &args->flen))
-		return 0;
+		return false;
 	if (!svcxdr_decode_sattr3(rqstp, xdr, &args->attrs))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
-		return 0;
+		return false;
 
 	/* request sanity */
 	remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
 	remaining -= xdr_stream_pos(xdr);
 	if (remaining < xdr_align_size(args->tlen))
-		return 0;
+		return false;
 
 	args->first.iov_base = xdr->p;
 	args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
 
-	return 1;
+	return true;
 }
 
-int
-nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_mknodargs *args = rqstp->rq_argp;
 
 	if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->ftype) < 0)
-		return 0;
+		return false;
 	switch (args->ftype) {
 	case NF3CHR:
 	case NF3BLK:
···
 		/* Valid XDR but illegal file types */
 		break;
 	default:
-		return 0;
+		return false;
 	}
 
-	return 1;
+	return true;
 }
 
-int
-nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_renameargs *args = rqstp->rq_argp;
 
 	return svcxdr_decode_diropargs3(xdr, &args->ffh,
···
 					 &args->tname, &args->tlen);
 }
 
-int
-nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_linkargs *args = rqstp->rq_argp;
 
 	return svcxdr_decode_nfs_fh3(xdr, &args->ffh) &&
···
 					 &args->tname, &args->tlen);
 }
 
-int
-nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_readdirargs *args = rqstp->rq_argp;
 
 	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u64(xdr, &args->cookie) < 0)
-		return 0;
+		return false;
 	args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
 	if (!args->verf)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-int
-nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_readdirargs *args = rqstp->rq_argp;
 	u32 dircount;
 
 	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u64(xdr, &args->cookie) < 0)
-		return 0;
+		return false;
 	args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
 	if (!args->verf)
-		return 0;
+		return false;
 	/* dircount is ignored */
 	if (xdr_stream_decode_u32(xdr, &dircount) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-int
-nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_decode_commitargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd3_commitargs *args = rqstp->rq_argp;
 
 	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 /*
···
  */
 
 /* GETATTR */
-int
-nfs3svc_encode_getattrres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_getattrres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_attrstat *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		lease_get_mtime(d_inode(resp->fh.fh_dentry), &resp->stat.mtime);
 		if (!svcxdr_encode_fattr3(rqstp, xdr, &resp->fh, &resp->stat))
-			return 0;
+			return false;
 		break;
 	}
 
-	return 1;
+	return true;
 }
 
 /* SETATTR, REMOVE, RMDIR */
-int
-nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_wccstat(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_attrstat *resp = rqstp->rq_resp;
 
 	return svcxdr_encode_nfsstat3(xdr, resp->status) &&
···
 }
 
 /* LOOKUP */
-int nfs3svc_encode_lookupres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_lookupres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_diropres *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_nfs_fh3(xdr, &resp->fh))
-			return 0;
+			return false;
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->dirfh))
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->dirfh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 /* ACCESS */
-int
-nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_accessres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_accessres *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 		if (xdr_stream_encode_u32(xdr, resp->access) < 0)
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 /* READLINK */
-int
-nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 	struct kvec *head = rqstp->rq_res.head;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 		if (xdr_stream_encode_u32(xdr, resp->len) < 0)
-			return 0;
+			return false;
 		xdr_write_pages(xdr, resp->pages, 0, resp->len);
 		if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 /* READ */
-int
-nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_readres *resp = rqstp->rq_resp;
 	struct kvec *head = rqstp->rq_res.head;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 		if (xdr_stream_encode_u32(xdr, resp->count) < 0)
-			return 0;
+			return false;
 		if (xdr_stream_encode_bool(xdr, resp->eof) < 0)
-			return 0;
+			return false;
 		if (xdr_stream_encode_u32(xdr, resp->count) < 0)
-			return 0;
+			return false;
 		xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
 				resp->count);
 		if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 /* WRITE */
-int
-nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_writeres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_writeres *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 		if (xdr_stream_encode_u32(xdr, resp->count) < 0)
-			return 0;
+			return false;
 		if (xdr_stream_encode_u32(xdr, resp->committed) < 0)
-			return 0;
+			return false;
 		if (!svcxdr_encode_writeverf3(xdr, resp->verf))
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 /* CREATE, MKDIR, SYMLINK, MKNOD */
-int
-nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_createres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_diropres *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_post_op_fh3(xdr, &resp->fh))
-			return 0;
+			return false;
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 		if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->dirfh))
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->dirfh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 /* RENAME */
-int
-nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_renameres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_renameres *resp = rqstp->rq_resp;
 
 	return svcxdr_encode_nfsstat3(xdr, resp->status) &&
···
 }
 
 /* LINK */
-int
-nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_linkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_linkres *resp = rqstp->rq_resp;
 
 	return svcxdr_encode_nfsstat3(xdr, resp->status) &&
···
 }
 
 /* READDIR */
-int
-nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_readdirres *resp = rqstp->rq_resp;
 	struct xdr_buf *dirlist = &resp->dirlist;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 		if (!svcxdr_encode_cookieverf3(xdr, resp->verf))
-			return 0;
+			return false;
 		xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
 		/* no more entries */
 		if (xdr_stream_encode_item_absent(xdr) < 0)
-			return 0;
+			return false;
 		if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 static __be32
···
 }
 
 /* FSSTAT */
-int
-nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
-			return 0;
+			return false;
 		if (!svcxdr_encode_fsstat3resok(xdr, resp))
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 static bool
···
 }
 
 /* FSINFO */
-int
-nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
-			return 0;
+			return false;
 		if (!svcxdr_encode_fsinfo3resok(xdr, resp))
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 static bool
···
 }
 
 /* PATHCONF */
-int
-nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
-			return 0;
+			return false;
 		if (!svcxdr_encode_pathconf3resok(xdr, resp))
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 /* COMMIT */
-int
-nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs3svc_encode_commitres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd3_commitres *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 		if (!svcxdr_encode_writeverf3(xdr, resp->verf))
-			return 0;
+			return false;
 		break;
 	default:
 		if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
-			return 0;
+			return false;
 	}
 
-	return 1;
+	return true;
 }
 
 /*

fs/nfsd/nfs4callback.c

···
 
 	BUG_ON(length > NFS4_FHSIZE);
 	p = xdr_reserve_space(xdr, 4 + length);
-	xdr_encode_opaque(p, &fh->fh_base, length);
+	xdr_encode_opaque(p, &fh->fh_raw, length);
 }
 
 /*

fs/nfsd/nfs4proc.c

···
 
 	fh_put(&cstate->current_fh);
 	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
-	memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
+	memcpy(&cstate->current_fh.fh_handle.fh_raw, putfh->pf_fhval,
 	       putfh->pf_fhlen);
 	ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
···
 
 	write->wr_how_written = write->wr_stable_how;
 
-	nvecs = svc_fill_write_vector(rqstp, write->wr_payload.pages,
-				      write->wr_payload.head, write->wr_buflen);
+	nvecs = svc_fill_write_vector(rqstp, &write->wr_payload);
 	WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
 
 	status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf,
···
 static __be32 nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr,
 		struct nfsd4_ssc_umount_item **retwork, struct vfsmount **ss_mnt)
 {
-	struct nfsd4_ssc_umount_item *ni = 0;
+	struct nfsd4_ssc_umount_item *ni = NULL;
 	struct nfsd4_ssc_umount_item *work = NULL;
 	struct nfsd4_ssc_umount_item *tmp;
 	DEFINE_WAIT(wait);
···
 	s_fh = &cstate->save_fh;
 
 	copy->c_fh.size = s_fh->fh_handle.fh_size;
-	memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_base, copy->c_fh.size);
+	memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_raw, copy->c_fh.size);
 	copy->stateid.seqid = cpu_to_be32(s_stid->si_generation);
 	memcpy(copy->stateid.other, (void *)&s_stid->si_opaque,
 	       sizeof(stateid_opaque_t));
···
 	__be32		status;
 
 	resp->xdr = &rqstp->rq_res_stream;
+	resp->statusp = resp->xdr->p;
 
 	/* reserve space for: NFS status code */
 	xdr_reserve_space(resp->xdr, XDR_UNIT);
 
-	resp->tagp = resp->xdr->p;
 	/* reserve space for: taglen, tag, and opcnt */
 	xdr_reserve_space(resp->xdr, XDR_UNIT * 2 + args->taglen);
 	resp->taglen = args->taglen;

fs/nfsd/nfs4state.c

···
 		}
 		spin_unlock(&blocked_delegations_lock);
 	}
-	hash = jhash(&fh->fh_base, fh->fh_size, 0);
+	hash = jhash(&fh->fh_raw, fh->fh_size, 0);
 	if (test_bit(hash&255, bd->set[0]) &&
 	    test_bit((hash>>8)&255, bd->set[0]) &&
 	    test_bit((hash>>16)&255, bd->set[0]))
···
 	u32 hash;
 	struct bloom_pair *bd = &blocked_delegations;
 
-	hash = jhash(&fh->fh_base, fh->fh_size, 0);
+	hash = jhash(&fh->fh_raw, fh->fh_size, 0);
 
 	spin_lock(&blocked_delegations_lock);
 	__set_bit(hash&255, bd->set[bd->new]);
···
 static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
 {
 	bool do_wakeup = false;
-	struct nfsd4_ssc_umount_item *ni = 0;
+	struct nfsd4_ssc_umount_item *ni = NULL;
 	struct nfsd4_ssc_umount_item *tmp;
 
 	spin_lock(&nn->nfsd_ssc_lock);

fs/nfsd/nfs4xdr.c

···
 	return true;
 }
 
-static int
+static bool
 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 {
 	struct nfsd4_op *op;
···
 	int i;
 
 	if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0)
-		return 0;
+		return false;
 	max_reply += XDR_UNIT;
 	argp->tag = NULL;
 	if (unlikely(argp->taglen)) {
 		if (argp->taglen > NFSD4_MAX_TAGLEN)
-			return 0;
+			return false;
 		p = xdr_inline_decode(argp->xdr, argp->taglen);
 		if (!p)
-			return 0;
+			return false;
 		argp->tag = svcxdr_savemem(argp, p, argp->taglen);
 		if (!argp->tag)
-			return 0;
+			return false;
 		max_reply += xdr_align_size(argp->taglen);
 	}
 
 	if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(argp->xdr, &argp->opcnt) < 0)
-		return 0;
+		return false;
 
 	/*
 	 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
···
 	 * nfsd4_proc can handle this is an NFS-level error.
 	 */
 	if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
-		return 1;
+		return true;
 
 	if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
 		argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
 		if (!argp->ops) {
 			argp->ops = argp->iops;
 			dprintk("nfsd: couldn't allocate room for COMPOUND\n");
-			return 0;
+			return false;
 		}
 	}
 
···
 		op->replay = NULL;
 
 		if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
-			return 0;
+			return false;
 		if (nfsd4_opnum_in_range(argp, op)) {
 			op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
 			if (op->status != nfs_ok)
···
 	if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
 		clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
 
-	return 1;
+	return true;
 }
 
 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
···
 		p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
 		if (!p)
 			goto out_resource;
-		p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
+		p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw,
 					fhp->fh_handle.fh_size);
 	}
 	if (bmval0 & FATTR4_WORD0_FILEID) {
···
 	p = xdr_reserve_space(xdr, len + 4);
 	if (!p)
 		return nfserr_resource;
-	p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
+	p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len);
 	return 0;
 }
 
···
 	}
 }
 
-int
-nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
 	struct nfsd4_compoundargs *args = rqstp->rq_argp;
 
 	/* svcxdr_tmp_alloc */
 	args->to_free = NULL;
 
-	args->xdr = &rqstp->rq_arg_stream;
+	args->xdr = xdr;
 	args->ops = args->iops;
 	args->rqstp = rqstp;
 
 	return nfsd4_decode_compound(args);
 }
 
-int
-nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
-	struct xdr_buf *buf = resp->xdr->buf;
+	struct xdr_buf *buf = xdr->buf;
+	__be32 *p;
 
 	WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
 				 buf->tail[0].iov_len);
 
-	*p = resp->cstate.status;
+	/*
+	 * Send buffer space for the following items is reserved
+	 * at the top of nfsd4_proc_compound().
+	 */
+	p = resp->statusp;
 
-	rqstp->rq_next_page = resp->xdr->page_ptr + 1;
+	*p++ = resp->cstate.status;
 
-	p = resp->tagp;
+	rqstp->rq_next_page = xdr->page_ptr + 1;
+
 	*p++ = htonl(resp->taglen);
 	memcpy(p, resp->tag, resp->taglen);
 	p += XDR_QUADLEN(resp->taglen);
 	*p++ = htonl(resp->opcnt);
 
 	nfsd4_sequence_done(resp);
-	return 1;
+	return true;
 }

fs/nfsd/nfscache.c

···
 	list_move_tail(&rp->c_lru, &b->lru_head);
 }
 
-static long
-prune_bucket(struct nfsd_drc_bucket *b, struct nfsd_net *nn)
+static long prune_bucket(struct nfsd_drc_bucket *b, struct nfsd_net *nn,
+			 unsigned int max)
 {
 	struct svc_cacherep *rp, *tmp;
 	long freed = 0;
···
 		    time_before(jiffies, rp->c_timestamp + RC_EXPIRE))
 			break;
 		nfsd_reply_cache_free_locked(b, rp, nn);
-		freed++;
+		if (max && freed++ > max)
+			break;
 	}
 	return freed;
+}
+
+static long nfsd_prune_bucket(struct nfsd_drc_bucket *b, struct nfsd_net *nn)
+{
+	return prune_bucket(b, nn, 3);
 }
 
 /*
···
 		if (list_empty(&b->lru_head))
 			continue;
 		spin_lock(&b->cache_lock);
-		freed += prune_bucket(b, nn);
+		freed += prune_bucket(b, nn, 0);
 		spin_unlock(&b->cache_lock);
 	}
 	return freed;
···
 	atomic_inc(&nn->num_drc_entries);
 	nfsd_stats_drc_mem_usage_add(nn, sizeof(*rp));
 
-	/* go ahead and prune the cache */
-	prune_bucket(b, nn);
+	nfsd_prune_bucket(b, nn);
 
 out_unlock:
 	spin_unlock(&b->cache_lock);

fs/nfsd/nfsctl.c

···
 	auth_domain_put(dom);
 	if (len)
 		return len;
-	
+
 	mesg = buf;
 	len = SIMPLE_TRANSACTION_LIMIT;
-	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
+	qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
 	mesg[-1] = '\n';
-	return mesg - buf;	
+	return mesg - buf;
 }
 
 /*

fs/nfsd/nfsd.h

···
  */
 struct nfsd_voidargs { };
 struct nfsd_voidres { };
-int		nfssvc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p);
-int		nfssvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p);
+bool		nfssvc_decode_voidarg(struct svc_rqst *rqstp,
+				      struct xdr_stream *xdr);
+bool		nfssvc_encode_voidres(struct svc_rqst *rqstp,
+				      struct xdr_stream *xdr);
 
 /*
  * Function prototypes.

fs/nfsd/nfsfh.c

···
 static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
 {
 	struct knfsd_fh	*fh = &fhp->fh_handle;
-	struct fid *fid = NULL, sfid;
+	struct fid *fid = NULL;
 	struct svc_export *exp;
 	struct dentry *dentry;
 	int fileid_type;
 	int data_left = fh->fh_size/4;
+	int len;
 	__be32 error;
 
 	error = nfserr_stale;
···
 	if (rqstp->rq_vers == 4 && fh->fh_size == 0)
 		return nfserr_nofilehandle;
 
-	if (fh->fh_version == 1) {
-		int len;
+	if (fh->fh_version != 1)
+		return error;
 
-		if (--data_left < 0)
-			return error;
-		if (fh->fh_auth_type != 0)
-			return error;
-		len = key_len(fh->fh_fsid_type) / 4;
-		if (len == 0)
-			return error;
-		if  (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
-			/* deprecated, convert to type 3 */
-			len = key_len(FSID_ENCODE_DEV)/4;
-			fh->fh_fsid_type = FSID_ENCODE_DEV;
-			/*
-			 * struct knfsd_fh uses host-endian fields, which are
-			 * sometimes used to hold net-endian values. This
-			 * confuses sparse, so we must use __force here to
-			 * keep it from complaining.
-			 */
-			fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]),
-							ntohl((__force __be32)fh->fh_fsid[1])));
-			fh->fh_fsid[1] = fh->fh_fsid[2];
-		}
-		data_left -= len;
-		if (data_left < 0)
-			return error;
-		exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid);
-		fid = (struct fid *)(fh->fh_fsid + len);
-	} else {
-		__u32 tfh[2];
-		dev_t xdev;
-		ino_t xino;
-
-		if (fh->fh_size != NFS_FHSIZE)
-			return error;
-		/* assume old filehandle format */
-		xdev = old_decode_dev(fh->ofh_xdev);
-		xino = u32_to_ino_t(fh->ofh_xino);
-		mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
-		exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
+	if (--data_left < 0)
+		return error;
+	if (fh->fh_auth_type != 0)
+		return error;
+	len = key_len(fh->fh_fsid_type) / 4;
+	if (len == 0)
+		return error;
+	if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
+		/* deprecated, convert to type 3 */
+		len = key_len(FSID_ENCODE_DEV)/4;
+		fh->fh_fsid_type = FSID_ENCODE_DEV;
+		/*
+		 * struct knfsd_fh uses host-endian fields, which are
+		 * sometimes used to hold net-endian values. This
+		 * confuses sparse, so we must use __force here to
+		 * keep it from complaining.
+		 */
+		fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]),
+						      ntohl((__force __be32)fh->fh_fsid[1])));
+		fh->fh_fsid[1] = fh->fh_fsid[2];
 	}
+	data_left -= len;
+	if (data_left < 0)
+		return error;
+	exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid);
+	fid = (struct fid *)(fh->fh_fsid + len);
 
 	error = nfserr_stale;
 	if (IS_ERR(exp)) {
···
 	if (rqstp->rq_vers > 2)
 		error = nfserr_badhandle;
 
-	if (fh->fh_version != 1) {
-		sfid.i32.ino = fh->ofh_ino;
-		sfid.i32.gen = fh->ofh_generation;
-		sfid.i32.parent_ino = fh->ofh_dirino;
-		fid = &sfid;
-		data_left = 3;
-		if (fh->ofh_dirino == 0)
-			fileid_type = FILEID_INO32_GEN;
-		else
-			fileid_type = FILEID_INO32_GEN_PARENT;
-	} else
-		fileid_type = fh->fh_fileid_type;
+	fileid_type = fh->fh_fileid_type;
 
 	if (fileid_type == FILEID_ROOT)
 		dentry = dget(exp->ex_path.dentry);
···
 	}
 }
 
-/*
- * for composing old style file handles
- */
-static inline void _fh_update_old(struct dentry *dentry,
-				  struct svc_export *exp,
-				  struct knfsd_fh *fh)
-{
-	fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino);
-	fh->ofh_generation = d_inode(dentry)->i_generation;
-	if (d_is_dir(dentry) ||
-	    (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
-		fh->ofh_dirino = 0;
-}
-
 static bool is_root_export(struct svc_export *exp)
 {
 	return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
···
 	/* ref_fh is a reference file handle.
 	 * if it is non-null and for the same filesystem, then we should compose
 	 * a filehandle which is of the same version, where possible.
-	 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
-	 * Then create a 32byte filehandle using nfs_fhbase_old
-	 *
 	 */
 
 	struct inode * inode = d_inode(dentry);
···
 	fhp->fh_dentry = dget(dentry); /* our internal copy */
 	fhp->fh_export = exp_get(exp);
 
-	if (fhp->fh_handle.fh_version == 0xca) {
-		/* old style filehandle please */
-		memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
-		fhp->fh_handle.fh_size = NFS_FHSIZE;
-		fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
-		fhp->fh_handle.ofh_dev =  old_encode_dev(ex_dev);
-		fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
-		fhp->fh_handle.ofh_xino =
-			ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino);
-		fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
-		if (inode)
-			_fh_update_old(dentry, exp, &fhp->fh_handle);
-	} else {
-		fhp->fh_handle.fh_size =
-			key_len(fhp->fh_handle.fh_fsid_type) + 4;
-		fhp->fh_handle.fh_auth_type = 0;
+	fhp->fh_handle.fh_size =
+		key_len(fhp->fh_handle.fh_fsid_type) + 4;
+	fhp->fh_handle.fh_auth_type = 0;
 
-		mk_fsid(fhp->fh_handle.fh_fsid_type,
-			fhp->fh_handle.fh_fsid,
-			ex_dev,
-			d_inode(exp->ex_path.dentry)->i_ino,
-			exp->ex_fsid, exp->ex_uuid);
+	mk_fsid(fhp->fh_handle.fh_fsid_type,
+		fhp->fh_handle.fh_fsid,
+		ex_dev,
+		d_inode(exp->ex_path.dentry)->i_ino,
+		exp->ex_fsid, exp->ex_uuid);
 
-		if (inode)
-			_fh_update(fhp, exp, dentry);
-		if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {
-			fh_put(fhp);
-			return nfserr_opnotsupp;
-		}
+	if (inode)
+		_fh_update(fhp, exp, dentry);
+	if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {
+		fh_put(fhp);
+		return nfserr_opnotsupp;
 	}
 
 	return 0;
···
 	dentry = fhp->fh_dentry;
 	if (d_really_is_negative(dentry))
 		goto out_negative;
-	if (fhp->fh_handle.fh_version != 1) {
-		_fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
-	} else {
-		if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
-			return 0;
+	if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
+		return 0;
 
-		_fh_update(fhp, fhp->fh_export, dentry);
-		if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID)
-			return nfserr_opnotsupp;
-	}
+	_fh_update(fhp, fhp->fh_export, dentry);
+	if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID)
+		return nfserr_opnotsupp;
 	return 0;
 out_bad:
 	printk(KERN_ERR "fh_update: fh not verified!\n");
···
 char * SVCFH_fmt(struct svc_fh *fhp)
 {
 	struct knfsd_fh *fh = &fhp->fh_handle;
+	static char buf[2+1+1+64*3+1];
 
-	static char buf[80];
-	sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
-		fh->fh_size,
-		fh->fh_base.fh_pad[0],
-		fh->fh_base.fh_pad[1],
-		fh->fh_base.fh_pad[2],
-		fh->fh_base.fh_pad[3],
-		fh->fh_base.fh_pad[4],
-		fh->fh_base.fh_pad[5]);
+	if (fh->fh_size < 0 || fh->fh_size> 64)
+		return "bad-fh";
+	sprintf(buf, "%d: %*ph", fh->fh_size, fh->fh_size, fh->fh_raw);
 	return buf;
 }
 

fs/nfsd/nfsfh.h

···
 
 #include <linux/crc32.h>
 #include <linux/sunrpc/svc.h>
-#include <uapi/linux/nfsd/nfsfh.h>
 #include <linux/iversion.h>
 #include <linux/exportfs.h>
+#include <linux/nfs4.h>
+
+/*
+ * The file handle starts with a sequence of four-byte words.
+ * The first word contains a version number (1) and three descriptor bytes
+ * that tell how the remaining 3 variable length fields should be handled.
+ * These three bytes are auth_type, fsid_type and fileid_type.
+ *
+ * All four-byte values are in host-byte-order.
+ *
+ * The auth_type field is deprecated and must be set to 0.
+ *
+ * The fsid_type identifies how the filesystem (or export point) is
+ *    encoded.
+ *  Current values:
+ *     0  - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
+ *        NOTE: we cannot use the kdev_t device id value, because kdev_t.h
+ *              says we mustn't.  We must break it up and reassemble.
+ *     1  - 4 byte user specified identifier
+ *     2  - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
+ *     3  - 4 byte device id, encoded for user-space, 4 byte inode number
+ *     4  - 4 byte inode number and 4 byte uuid
+ *     5  - 8 byte uuid
+ *     6  - 16 byte uuid
+ *     7  - 8 byte inode number and 16 byte uuid
+ *
+ * The fileid_type identifies how the file within the filesystem is encoded.
+ *   The values for this field are filesystem specific, exccept that
+ *   filesystems must not use the values '0' or '0xff'. 'See enum fid_type'
+ *   in include/linux/exportfs.h for currently registered values.
+ */
+
+struct knfsd_fh {
+	unsigned int	fh_size;	/*
+					 * Points to the current size while
+					 * building a new file handle.
+					 */
+	union {
+		char			fh_raw[NFS4_FHSIZE];
+		struct {
+			u8		fh_version;	/* == 1 */
+			u8		fh_auth_type;	/* deprecated */
+			u8		fh_fsid_type;
+			u8		fh_fileid_type;
+			u32		fh_fsid[]; /* flexible-array member */
+		};
+	};
+};
 
 static inline __u32 ino_t_to_u32(ino_t ino)
 {
···
 fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
 {
 	dst->fh_size = src->fh_size;
-	memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
+	memcpy(&dst->fh_raw, &src->fh_raw, src->fh_size);
 }
 
 static __inline__ struct svc_fh *
···
 {
 	if (fh1->fh_size != fh2->fh_size)
 		return false;
-	if (memcmp(fh1->fh_base.fh_pad, fh2->fh_base.fh_pad, fh1->fh_size) != 0)
+	if (memcmp(fh1->fh_raw, fh2->fh_raw, fh1->fh_size) != 0)
 		return false;
 	return true;
 }
···
  */
 static inline u32 knfsd_fh_hash(const struct knfsd_fh *fh)
 {
-	return ~crc32_le(0xFFFFFFFF, (unsigned char *)&fh->fh_base, fh->fh_size);
+	return ~crc32_le(0xFFFFFFFF, fh->fh_raw, fh->fh_size);
 }
 #else
 static inline u32 knfsd_fh_hash(const struct knfsd_fh *fh)

fs/nfsd/nfsproc.c

···
 		SVCFH_fmt(&argp->fh),
 		argp->len, argp->offset);
 
-	nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
-				      &argp->first, cnt);
+	nvecs = svc_fill_write_vector(rqstp, &argp->payload);
 	if (!nvecs) {
 		resp->status = nfserr_io;
 		goto out;

fs/nfsd/nfssvc.c

···
 int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
 {
 	const struct svc_procedure *proc = rqstp->rq_procinfo;
-	struct kvec *argv = &rqstp->rq_arg.head[0];
-	struct kvec *resv = &rqstp->rq_res.head[0];
-	__be32 *p;
 
 	/*
 	 * Give the xdr decoder a chance to change this if it wants
···
 	rqstp->rq_cachetype = proc->pc_cachetype;
 
 	svcxdr_init_decode(rqstp);
-	if (!proc->pc_decode(rqstp, argv->iov_base))
+	if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream))
 		goto out_decode_err;
 
 	switch (nfsd_cache_lookup(rqstp)) {
···
 	 * Need to grab the location to store the status, as
 	 * NFSv4 does some encoding while processing
 	 */
-	p = resv->iov_base + resv->iov_len;
 	svcxdr_init_encode(rqstp);
 
 	*statp = proc->pc_func(rqstp);
 	if (*statp == rpc_drop_reply || test_bit(RQ_DROPME, &rqstp->rq_flags))
 		goto out_update_drop;
 
-	if (!proc->pc_encode(rqstp, p))
+	if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream))
 		goto out_encode_err;
 
 	nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1);
···
 /**
  * nfssvc_decode_voidarg - Decode void arguments
  * @rqstp: Server RPC transaction context
- * @p: buffer containing arguments to decode
+ * @xdr: XDR stream positioned at arguments to decode
  *
  * Return values:
- *   %0: Arguments were not valid
- *   %1: Decoding was successful
+ *   %false: Arguments were not valid
+ *   %true: Decoding was successful
  */
-int nfssvc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p)
+bool nfssvc_decode_voidarg(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	return 1;
+	return true;
 }
 
 /**
  * nfssvc_encode_voidres - Encode void results
  * @rqstp: Server RPC transaction context
- * @p: buffer in which to encode results
+ * @xdr: XDR stream into which to encode results
  *
  * Return values:
- *   %0: Local error while encoding
- *   %1: Encoding was successful
+ *   %false: Local error while encoding
+ *   %true: Encoding was successful
  */
-int nfssvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
+bool nfssvc_encode_voidres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	return 1;
+	return true;
 }
 
 int nfsd_pool_stats_open(struct inode *inode, struct file *file)

fs/nfsd/nfsxdr.c

···
 	if (!p)
 		return false;
 	fh_init(fhp, NFS_FHSIZE);
-	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
+	memcpy(&fhp->fh_handle.fh_raw, p, NFS_FHSIZE);
 	fhp->fh_handle.fh_size = NFS_FHSIZE;
 
 	return true;
···
 	p = xdr_reserve_space(xdr, NFS_FHSIZE);
 	if (!p)
 		return false;
-	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
+	memcpy(p, &fhp->fh_handle.fh_raw, NFS_FHSIZE);
 
 	return true;
 }
···
  * XDR decode functions
  */
 
-int
-nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_fhandle *args = rqstp->rq_argp;
 
 	return svcxdr_decode_fhandle(xdr, &args->fh);
 }
 
-int
-nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_sattrargs *args = rqstp->rq_argp;
 
 	return svcxdr_decode_fhandle(xdr, &args->fh) &&
 		svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
 }
 
-int
-nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_diropargs *args = rqstp->rq_argp;
 
 	return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
 }
 
-int
-nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_readargs *args = rqstp->rq_argp;
 	u32 totalcount;
 
 	if (!svcxdr_decode_fhandle(xdr, &args->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
-		return 0;
+		return false;
 	/* totalcount is ignored */
 	if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
-int
-nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_writeargs *args = rqstp->rq_argp;
-	struct kvec *head = rqstp->rq_arg.head;
-	struct kvec *tail = rqstp->rq_arg.tail;
 	u32 beginoffset, totalcount;
-	size_t remaining;
 
 	if (!svcxdr_decode_fhandle(xdr, &args->fh))
-		return 0;
+		return false;
 	/* beginoffset is ignored */
 	if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
-		return 0;
+		return false;
 	/* totalcount is ignored */
 	if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
-		return 0;
+		return false;
 
 	/* opaque data */
 	if (xdr_stream_decode_u32(xdr, &args->len) < 0)
-		return 0;
+		return false;
 	if (args->len > NFSSVC_MAXBLKSIZE_V2)
-		return 0;
-	remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
-	remaining -= xdr_stream_pos(xdr);
-	if (remaining < xdr_align_size(args->len))
-		return 0;
-	args->first.iov_base = xdr->p;
-	args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
+		return false;
+	if (!xdr_stream_subsegment(xdr, &args->payload, args->len))
+		return false;
 
-	return 1;
+	return true;
 }
 
-int
-nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_createargs *args = rqstp->rq_argp;
 
 	return svcxdr_decode_diropargs(xdr, &args->fh,
···
 		svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
 }
 
-int
-nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_renameargs *args = rqstp->rq_argp;
 
 	return svcxdr_decode_diropargs(xdr, &args->ffh,
···
 					&args->tname, &args->tlen);
 }
 
-int
-nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_linkargs *args = rqstp->rq_argp;
 
 	return svcxdr_decode_fhandle(xdr, &args->ffh) &&
···
 					&args->tname, &args->tlen);
 }
 
-int
-nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_symlinkargs *args = rqstp->rq_argp;
 	struct kvec *head = rqstp->rq_arg.head;
 
 	if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
-		return 0;
+		return false;
 	if (args->tlen == 0)
-		return 0;
+		return false;
 
 	args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
 	args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
 	if (!args->first.iov_base)
-		return 0;
+		return false;
 	return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
 }
 
-int
-nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 	struct nfsd_readdirargs *args = rqstp->rq_argp;
 
 	if (!svcxdr_decode_fhandle(xdr, &args->fh))
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
-		return 0;
+		return false;
 	if (xdr_stream_decode_u32(xdr, &args->count) < 0)
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 /*
  * XDR encode functions
  */
 
-int
-nfssvc_encode_statres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_encode_statres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd_stat *resp = rqstp->rq_resp;
 
 	return svcxdr_encode_stat(xdr, resp->status);
 }
 
-int
-nfssvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_encode_attrstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd_attrstat *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_stat(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
-			return 0;
+			return false;
 		break;
 	}
 
-	return 1;
+	return true;
 }
 
-int
-nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_encode_diropres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd_diropres *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_stat(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_fhandle(xdr, &resp->fh))
-			return 0;
+			return false;
 		if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
-			return 0;
+			return false;
 		break;
 	}
 
-	return 1;
+	return true;
 }
 
-int
-nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd_readlinkres *resp = rqstp->rq_resp;
 	struct kvec *head = rqstp->rq_res.head;
 
 	if (!svcxdr_encode_stat(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (xdr_stream_encode_u32(xdr, resp->len) < 0)
-			return 0;
+			return false;
 		xdr_write_pages(xdr, &resp->page, 0, resp->len);
 		if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
-			return 0;
+			return false;
 		break;
 	}
 
-	return 1;
+	return true;
 }
 
-int
-nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd_readres *resp = rqstp->rq_resp;
 	struct kvec *head = rqstp->rq_res.head;
 
 	if (!svcxdr_encode_stat(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
-			return 0;
+			return false;
 		if (xdr_stream_encode_u32(xdr, resp->count) < 0)
-			return 0;
+			return false;
 		xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
 				resp->count);
 		if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
-			return 0;
+			return false;
 		break;
 	}
 
-	return 1;
+	return true;
 }
 
-int
-nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd_readdirres *resp = rqstp->rq_resp;
 	struct xdr_buf *dirlist = &resp->dirlist;
 
 	if (!svcxdr_encode_stat(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
 		/* no more entries */
 		if (xdr_stream_encode_item_absent(xdr) < 0)
-			return 0;
+			return false;
 		if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
-			return 0;
+			return false;
 		break;
 	}
 
-	return 1;
+	return true;
 }
 
-int
-nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p)
+bool
+nfssvc_encode_statfsres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
-	struct xdr_stream *xdr = &rqstp->rq_res_stream;
 	struct nfsd_statfsres *resp = rqstp->rq_resp;
 	struct kstatfs	*stat = &resp->stats;
+	__be32 *p;
 
 	if (!svcxdr_encode_stat(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		p = xdr_reserve_space(xdr, XDR_UNIT * 5);
 		if (!p)
-			return 0;
+			return false;
 		*p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2);
 		*p++ = cpu_to_be32(stat->f_bsize);
 		*p++ = cpu_to_be32(stat->f_blocks);
···
 		break;
 	}
 
-	return 1;
+	return true;
 }
 
 /**

fs/nfsd/vfs.c

···
  * returned. Otherwise the covered directory is returned.
  * NOTE: this mountpoint crossing is not supported properly by all
  *   clients and is explicitly disallowed for NFSv3
+ *      NeilBrown <[e-mail]>
  */
 __be32
 nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
···
 	path.dentry = fhp->fh_dentry;
 	inode = d_inode(path.dentry);
 
-	/* Disallow write access to files with the append-only bit set
-	 * or any access when mandatory locking enabled
-	 */
 	err = nfserr_perm;
 	if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE))
 		goto out;
···
 
 	if (nfsd_create_is_exclusive(createmode)) {
 		/* solaris7 gets confused (bugid 4218508) if these have
-		 * the high bit set, so just clear the high bits. If this is
+		 * the high bit set, as do xfs filesystems without the
+		 * "bigtime" feature.  So just clear the high bits. If this is
 		 * ever changed to use different attrs for storing the
 		 * verifier, then do_open_lookup() will also need to be fixed
 		 * accordingly.

fs/nfsd/xdr.h

···
 	svc_fh			fh;
 	__u32			offset;
 	int			len;
-	struct kvec		first;
+	struct xdr_buf		payload;
 };
 
 struct nfsd_createargs {
···
 #define NFS2_SVC_XDRSIZE	sizeof(union nfsd_xdrstore)
 
 
-int nfssvc_decode_fhandleargs(struct svc_rqst *, __be32 *);
-int nfssvc_decode_sattrargs(struct svc_rqst *, __be32 *);
-int nfssvc_decode_diropargs(struct svc_rqst *, __be32 *);
-int nfssvc_decode_readargs(struct svc_rqst *, __be32 *);
-int nfssvc_decode_writeargs(struct svc_rqst *, __be32 *);
-int nfssvc_decode_createargs(struct svc_rqst *, __be32 *);
-int nfssvc_decode_renameargs(struct svc_rqst *, __be32 *);
-int nfssvc_decode_linkargs(struct svc_rqst *, __be32 *);
-int nfssvc_decode_symlinkargs(struct svc_rqst *, __be32 *);
-int nfssvc_decode_readdirargs(struct svc_rqst *, __be32 *);
-int nfssvc_encode_statres(struct svc_rqst *, __be32 *);
-int nfssvc_encode_attrstatres(struct svc_rqst *, __be32 *);
-int nfssvc_encode_diropres(struct svc_rqst *, __be32 *);
-int nfssvc_encode_readlinkres(struct svc_rqst *, __be32 *);
-int nfssvc_encode_readres(struct svc_rqst *, __be32 *);
-int nfssvc_encode_statfsres(struct svc_rqst *, __be32 *);
-int nfssvc_encode_readdirres(struct svc_rqst *, __be32 *);
+bool nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+
+bool nfssvc_encode_statres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_encode_attrstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_encode_diropres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_encode_statfsres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfssvc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
 
 void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset);
 int nfssvc_encode_entry(void *data, const char *name, int namlen,

fs/nfsd/xdr3.h

···
 	__u32			count;
 	int			stable;
 	__u32			len;
-	struct kvec		first;
+	struct xdr_buf		payload;
 };
 
 struct nfsd3_createargs {
···
 
 #define NFS3_SVC_XDRSIZE		sizeof(union nfsd3_xdrstore)
 
-int nfs3svc_decode_fhandleargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_sattrargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_diropargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_accessargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_readargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_writeargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_createargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_mkdirargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_mknodargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_renameargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_linkargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_symlinkargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_readdirargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_readdirplusargs(struct svc_rqst *, __be32 *);
-int nfs3svc_decode_commitargs(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_getattrres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_wccstat(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_lookupres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_accessres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_readlinkres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_readres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_writeres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_createres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_renameres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_linkres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_readdirres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_fsstatres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_fsinfores(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_pathconfres(struct svc_rqst *, __be32 *);
-int nfs3svc_encode_commitres(struct svc_rqst *, __be32 *);
+bool nfs3svc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_accessargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_decode_commitargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+
+bool nfs3svc_encode_getattrres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_wccstat(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_lookupres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_accessres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_writeres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_createres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_renameres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_linkres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs3svc_encode_commitres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
 
 void nfs3svc_release_fhandle(struct svc_rqst *);
 void nfs3svc_release_fhandle2(struct svc_rqst *);

fs/nfsd/xdr4.h

···
 	struct xdr_stream		*xdr;
 	struct svc_rqst *		rqstp;
 
+	__be32				*statusp;
 	u32				taglen;
 	char *				tag;
 	u32				opcnt;
-	__be32 *			tagp; /* tag, opcount encode location */
+
 	struct nfsd4_compound_state	cstate;
 };
 
···
 
 
 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp);
-int nfs4svc_decode_compoundargs(struct svc_rqst *, __be32 *);
-int nfs4svc_encode_compoundres(struct svc_rqst *, __be32 *);
+bool nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *, u32);
 void nfsd4_encode_operation(struct nfsd4_compoundres *, struct nfsd4_op *);
 void nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op);

include/linux/lockd/xdr.h

···
  */
 #define NLMSVC_XDRSIZE		sizeof(struct nlm_args)
 
-int	nlmsvc_decode_testargs(struct svc_rqst *, __be32 *);
-int	nlmsvc_encode_testres(struct svc_rqst *, __be32 *);
-int	nlmsvc_decode_lockargs(struct svc_rqst *, __be32 *);
-int	nlmsvc_decode_cancargs(struct svc_rqst *, __be32 *);
-int	nlmsvc_decode_unlockargs(struct svc_rqst *, __be32 *);
-int	nlmsvc_encode_res(struct svc_rqst *, __be32 *);
-int	nlmsvc_decode_res(struct svc_rqst *, __be32 *);
-int	nlmsvc_encode_void(struct svc_rqst *, __be32 *);
-int	nlmsvc_decode_void(struct svc_rqst *, __be32 *);
-int	nlmsvc_decode_shareargs(struct svc_rqst *, __be32 *);
-int	nlmsvc_encode_shareres(struct svc_rqst *, __be32 *);
-int	nlmsvc_decode_notify(struct svc_rqst *, __be32 *);
-int	nlmsvc_decode_reboot(struct svc_rqst *, __be32 *);
+bool	nlmsvc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+
+bool	nlmsvc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlmsvc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
 
 #endif /* LOCKD_XDR_H */

include/linux/lockd/xdr4.h

···
 #define	nlm4_fbig		cpu_to_be32(NLM_FBIG)
 #define	nlm4_failed		cpu_to_be32(NLM_FAILED)
 
+bool	nlm4svc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr);
 
-
-int	nlm4svc_decode_testargs(struct svc_rqst *, __be32 *);
-int	nlm4svc_encode_testres(struct svc_rqst *, __be32 *);
-int	nlm4svc_decode_lockargs(struct svc_rqst *, __be32 *);
-int	nlm4svc_decode_cancargs(struct svc_rqst *, __be32 *);
-int	nlm4svc_decode_unlockargs(struct svc_rqst *, __be32 *);
-int	nlm4svc_encode_res(struct svc_rqst *, __be32 *);
-int	nlm4svc_decode_res(struct svc_rqst *, __be32 *);
-int	nlm4svc_encode_void(struct svc_rqst *, __be32 *);
-int	nlm4svc_decode_void(struct svc_rqst *, __be32 *);
-int	nlm4svc_decode_shareargs(struct svc_rqst *, __be32 *);
-int	nlm4svc_encode_shareres(struct svc_rqst *, __be32 *);
-int	nlm4svc_decode_notify(struct svc_rqst *, __be32 *);
-int	nlm4svc_decode_reboot(struct svc_rqst *, __be32 *);
+bool	nlm4svc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr);
+bool	nlm4svc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr);
 
 extern const struct rpc_version nlm_version4;
 

include/linux/sunrpc/svc.h

···
 	/* Need xprt with congestion control */
 	bool			vs_need_cong_ctrl;
 
-	/* Override dispatch function (e.g. when caching replies).
-	 * A return value of 0 means drop the request. 
-	 * vs_dispatch == NULL means use default dispatcher.
-	 */
+	/* Dispatch function */
 	int			(*vs_dispatch)(struct svc_rqst *, __be32 *);
 };
 
···
 	/* process the request: */
 	__be32			(*pc_func)(struct svc_rqst *);
 	/* XDR decode args: */
-	int			(*pc_decode)(struct svc_rqst *, __be32 *data);
+	bool			(*pc_decode)(struct svc_rqst *rqstp,
+					     struct xdr_stream *xdr);
 	/* XDR encode result: */
-	int			(*pc_encode)(struct svc_rqst *, __be32 *data);
+	bool			(*pc_encode)(struct svc_rqst *rqstp,
+					     struct xdr_stream *xdr);
 	/* XDR free result: */
 	void			(*pc_release)(struct svc_rqst *);
 	unsigned int		pc_argsize;	/* argument struct size */
···
 					     unsigned int offset,
 					     unsigned int length);
 unsigned int	   svc_fill_write_vector(struct svc_rqst *rqstp,
-					 struct page **pages,
-					 struct kvec *first, size_t total);
+					 struct xdr_buf *payload);
 char		  *svc_fill_symlink_pathname(struct svc_rqst *rqstp,
 					     struct kvec *first, void *p,
 					     size_t total);

include/trace/events/rpcrdma.h

···
 				),					\
 				TP_ARGS(wc, cid))
 
+DECLARE_EVENT_CLASS(rpcrdma_send_completion_class,
+	TP_PROTO(
+		const struct ib_wc *wc,
+		const struct rpc_rdma_cid *cid
+	),
+
+	TP_ARGS(wc, cid),
+
+	TP_STRUCT__entry(
+		__field(u32, cq_id)
+		__field(int, completion_id)
+	),
+
+	TP_fast_assign(
+		__entry->cq_id = cid->ci_queue_id;
+		__entry->completion_id = cid->ci_completion_id;
+	),
+
+	TP_printk("cq.id=%u cid=%d",
+		__entry->cq_id, __entry->completion_id
+	)
+);
+
+#define DEFINE_SEND_COMPLETION_EVENT(name)				\
+		DEFINE_EVENT(rpcrdma_send_completion_class, name,	\
+				TP_PROTO(				\
+					const struct ib_wc *wc,		\
+					const struct rpc_rdma_cid *cid	\
+				),					\
+				TP_ARGS(wc, cid))
+
+DECLARE_EVENT_CLASS(rpcrdma_send_flush_class,
+	TP_PROTO(
+		const struct ib_wc *wc,
+		const struct rpc_rdma_cid *cid
+	),
+
+	TP_ARGS(wc, cid),
+
+	TP_STRUCT__entry(
+		__field(u32, cq_id)
+		__field(int, completion_id)
+		__field(unsigned long, status)
+		__field(unsigned int, vendor_err)
+	),
+
+	TP_fast_assign(
+		__entry->cq_id = cid->ci_queue_id;
+		__entry->completion_id = cid->ci_completion_id;
+		__entry->status = wc->status;
+		__entry->vendor_err = wc->vendor_err;
+	),
+
+	TP_printk("cq.id=%u cid=%d status=%s (%lu/0x%x)",
+		__entry->cq_id, __entry->completion_id,
+		rdma_show_wc_status(__entry->status),
+		__entry->status, __entry->vendor_err
+	)
+);
+
+#define DEFINE_SEND_FLUSH_EVENT(name)					\
+		DEFINE_EVENT(rpcrdma_send_flush_class, name,		\
+				TP_PROTO(				\
+					const struct ib_wc *wc,		\
+					const struct rpc_rdma_cid *cid	\
+				),					\
+				TP_ARGS(wc, cid))
+
 DECLARE_EVENT_CLASS(rpcrdma_mr_completion_class,
 	TP_PROTO(
 		const struct ib_wc *wc,
···
 
 #define DEFINE_RECEIVE_COMPLETION_EVENT(name)				\
 		DEFINE_EVENT(rpcrdma_receive_completion_class, name,	\
+				TP_PROTO(				\
+					const struct ib_wc *wc,		\
+					const struct rpc_rdma_cid *cid	\
+				),					\
+				TP_ARGS(wc, cid))
+
+DECLARE_EVENT_CLASS(rpcrdma_receive_success_class,
+	TP_PROTO(
+		const struct ib_wc *wc,
+		const struct rpc_rdma_cid *cid
+	),
+
+	TP_ARGS(wc, cid),
+
+	TP_STRUCT__entry(
+		__field(u32, cq_id)
+		__field(int, completion_id)
+		__field(u32, received)
+	),
+
+	TP_fast_assign(
+		__entry->cq_id = cid->ci_queue_id;
+		__entry->completion_id = cid->ci_completion_id;
+		__entry->received = wc->byte_len;
+	),
+
+	TP_printk("cq.id=%u cid=%d received=%u",
+		__entry->cq_id, __entry->completion_id,
+		__entry->received
+	)
+);
+
+#define DEFINE_RECEIVE_SUCCESS_EVENT(name)				\
+		DEFINE_EVENT(rpcrdma_receive_success_class, name,	\
+				TP_PROTO(				\
+					const struct ib_wc *wc,		\
+					const struct rpc_rdma_cid *cid	\
+				),					\
+				TP_ARGS(wc, cid))
+
+DECLARE_EVENT_CLASS(rpcrdma_receive_flush_class,
+	TP_PROTO(
+		const struct ib_wc *wc,
+		const struct rpc_rdma_cid *cid
+	),
+
+	TP_ARGS(wc, cid),
+
+	TP_STRUCT__entry(
+		__field(u32, cq_id)
+		__field(int, completion_id)
+		__field(unsigned long, status)
+		__field(unsigned int, vendor_err)
+	),
+
+	TP_fast_assign(
+		__entry->cq_id = cid->ci_queue_id;
+		__entry->completion_id = cid->ci_completion_id;
+		__entry->status = wc->status;
+		__entry->vendor_err = wc->vendor_err;
+	),
+
+	TP_printk("cq.id=%u cid=%d status=%s (%lu/0x%x)",
+		__entry->cq_id, __entry->completion_id,
+		rdma_show_wc_status(__entry->status),
+		__entry->status, __entry->vendor_err
+	)
+);
+
+#define DEFINE_RECEIVE_FLUSH_EVENT(name)				\
+		DEFINE_EVENT(rpcrdma_receive_flush_class, name,		\
 				TP_PROTO(				\
 					const struct ib_wc *wc,		\
 					const struct rpc_rdma_cid *cid	\
···
 	)
 );
 
-DEFINE_COMPLETION_EVENT(svcrdma_wc_send);
+DEFINE_SEND_COMPLETION_EVENT(svcrdma_wc_send);
+DEFINE_SEND_FLUSH_EVENT(svcrdma_wc_send_flush);
+DEFINE_SEND_FLUSH_EVENT(svcrdma_wc_send_err);
 
 TRACE_EVENT(svcrdma_post_recv,
 	TP_PROTO(
···
 	)
 );
 
-DEFINE_RECEIVE_COMPLETION_EVENT(svcrdma_wc_receive);
+DEFINE_RECEIVE_SUCCESS_EVENT(svcrdma_wc_recv);
+DEFINE_RECEIVE_FLUSH_EVENT(svcrdma_wc_recv_flush);
+DEFINE_RECEIVE_FLUSH_EVENT(svcrdma_wc_recv_err);
 
 TRACE_EVENT(svcrdma_rq_post_err,
 	TP_PROTO(
···
 DEFINE_POST_CHUNK_EVENT(write);
 DEFINE_POST_CHUNK_EVENT(reply);
 
-DEFINE_COMPLETION_EVENT(svcrdma_wc_read);
-DEFINE_COMPLETION_EVENT(svcrdma_wc_write);
+TRACE_EVENT(svcrdma_wc_read,
+	TP_PROTO(
+		const struct ib_wc *wc,
+		const struct rpc_rdma_cid *cid,
+		unsigned int totalbytes,
+		const ktime_t posttime
+	),
+
+	TP_ARGS(wc, cid, totalbytes, posttime),
+
+	TP_STRUCT__entry(
+		__field(u32, cq_id)
+		__field(int, completion_id)
+		__field(s64, read_latency)
+		__field(unsigned int, totalbytes)
+	),
+
+	TP_fast_assign(
+		__entry->cq_id = cid->ci_queue_id;
+		__entry->completion_id = cid->ci_completion_id;
+		__entry->totalbytes = totalbytes;
+		__entry->read_latency = ktime_us_delta(ktime_get(), posttime);
+	),
+
+	TP_printk("cq.id=%u cid=%d totalbytes=%u latency-us=%lld",
+		__entry->cq_id, __entry->completion_id,
+		__entry->totalbytes, __entry->read_latency
+	)
+);
+
+DEFINE_SEND_FLUSH_EVENT(svcrdma_wc_read_flush);
+DEFINE_SEND_FLUSH_EVENT(svcrdma_wc_read_err);
+
+DEFINE_SEND_COMPLETION_EVENT(svcrdma_wc_write);
+DEFINE_SEND_FLUSH_EVENT(svcrdma_wc_write_flush);
+DEFINE_SEND_FLUSH_EVENT(svcrdma_wc_write_err);
 
 TRACE_EVENT(svcrdma_qp_error,
 	TP_PROTO(

include/trace/events/sunrpc.h

···
 		__field(size_t, head_len)
 		__field(const void *, tail_base)
 		__field(size_t, tail_len)
+		__field(unsigned int, page_base)
 		__field(unsigned int, page_len)
 		__field(unsigned int, msg_len)
 	),
···
 		__entry->head_len = xdr->head[0].iov_len;
 		__entry->tail_base = xdr->tail[0].iov_base;
 		__entry->tail_len = xdr->tail[0].iov_len;
+		__entry->page_base = xdr->page_base;
 		__entry->page_len = xdr->page_len;
 		__entry->msg_len = xdr->len;
 	),
 
 	TP_printk(SUNRPC_TRACE_TASK_SPECIFIER
-		  " head=[%p,%zu] page=%u tail=[%p,%zu] len=%u",
+		  " head=[%p,%zu] page=%u(%u) tail=[%p,%zu] len=%u",
 		__entry->task_id, __entry->client_id,
-		__entry->head_base, __entry->head_len, __entry->page_len,
-		__entry->tail_base, __entry->tail_len, __entry->msg_len
+		__entry->head_base, __entry->head_len,
+		__entry->page_len, __entry->page_base,
+		__entry->tail_base, __entry->tail_len,
+		__entry->msg_len
 	)
 );
 
···
 		__field(size_t, head_len)
 		__field(const void *, tail_base)
 		__field(size_t, tail_len)
+		__field(unsigned int, page_base)
 		__field(unsigned int, page_len)
 		__field(unsigned int, msg_len)
 	),
···
 		__entry->head_len = xdr->head[0].iov_len;
 		__entry->tail_base = xdr->tail[0].iov_base;
 		__entry->tail_len = xdr->tail[0].iov_len;
+		__entry->page_base = xdr->page_base;
 		__entry->page_len = xdr->page_len;
 		__entry->msg_len = xdr->len;
 	),
 
-	TP_printk("xid=0x%08x head=[%p,%zu] page=%u tail=[%p,%zu] len=%u",
+	TP_printk("xid=0x%08x head=[%p,%zu] page=%u(%u) tail=[%p,%zu] len=%u",
 		__entry->xid,
-		__entry->head_base, __entry->head_len, __entry->page_len,
-		__entry->tail_base, __entry->tail_len, __entry->msg_len
+		__entry->head_base, __entry->head_len,
+		__entry->page_len, __entry->page_base,
+		__entry->tail_base, __entry->tail_len,
+		__entry->msg_len
 	)
 );
 
···
 	),
 
 	TP_printk("pid=%d", __entry->pid)
+);
+
+TRACE_EVENT(svc_alloc_arg_err,
+	TP_PROTO(
+		unsigned int pages
+	),
+
+	TP_ARGS(pages),
+
+	TP_STRUCT__entry(
+		__field(unsigned int, pages)
+	),
+
+	TP_fast_assign(
+		__entry->pages = pages;
+	),
+
+	TP_printk("pages=%u", __entry->pages)
 );
 
 TRACE_EVENT(svc_handle_xprt,

include/uapi/linux/nfsd/nfsfh.h

···
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-/*
- * This file describes the layout of the file handles as passed
- * over the wire.
- *
- * Copyright (C) 1995, 1996, 1997 Olaf Kirch <[e-mail]>
- */
-
-#ifndef _UAPI_LINUX_NFSD_FH_H
-#define _UAPI_LINUX_NFSD_FH_H
-
-#include <linux/types.h>
-#include <linux/nfs.h>
-#include <linux/nfs2.h>
-#include <linux/nfs3.h>
-#include <linux/nfs4.h>
-
-/*
- * This is the old "dentry style" Linux NFSv2 file handle.
- *
- * The xino and xdev fields are currently used to transport the
- * ino/dev of the exported inode.
- */
-struct nfs_fhbase_old {
-	__u32		fb_dcookie;	/* dentry cookie - always 0xfeebbaca */
-	__u32		fb_ino;		/* our inode number */
-	__u32		fb_dirino;	/* dir inode number, 0 for directories */
-	__u32		fb_dev;		/* our device */
-	__u32		fb_xdev;
-	__u32		fb_xino;
-	__u32		fb_generation;
-};
-
-/*
- * This is the new flexible, extensible style NFSv2/v3/v4 file handle.
- *
- * The file handle starts with a sequence of four-byte words.
- * The first word contains a version number (1) and three descriptor bytes
- * that tell how the remaining 3 variable length fields should be handled.
- * These three bytes are auth_type, fsid_type and fileid_type.
- *
- * All four-byte values are in host-byte-order.
- *
- * The auth_type field is deprecated and must be set to 0.
- *
- * The fsid_type identifies how the filesystem (or export point) is
- *    encoded.
- *  Current values:
- *     0  - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
- *        NOTE: we cannot use the kdev_t device id value, because kdev_t.h
- *              says we mustn't.  We must break it up and reassemble.
- *     1  - 4 byte user specified identifier
- *     2  - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
- *     3  - 4 byte device id, encoded for user-space, 4 byte inode number
- *     4  - 4 byte inode number and 4 byte uuid
- *     5  - 8 byte uuid
- *     6  - 16 byte uuid
- *     7  - 8 byte inode number and 16 byte uuid
- *
- * The fileid_type identified how the file within the filesystem is encoded.
- *   The values for this field are filesystem specific, exccept that
- *   filesystems must not use the values '0' or '0xff'. 'See enum fid_type'
- *   in include/linux/exportfs.h for currently registered values.
- */
-struct nfs_fhbase_new {
-	union {
-		struct {
-			__u8		fb_version_aux;	/* == 1, even => nfs_fhbase_old */
-			__u8		fb_auth_type_aux;
-			__u8		fb_fsid_type_aux;
-			__u8		fb_fileid_type_aux;
-			__u32		fb_auth[1];
-			/*	__u32		fb_fsid[0]; floating */
-			/*	__u32		fb_fileid[0]; floating */
-		};
-		struct {
-			__u8		fb_version;	/* == 1, even => nfs_fhbase_old */
-			__u8		fb_auth_type;
-			__u8		fb_fsid_type;
-			__u8		fb_fileid_type;
-			__u32		fb_auth_flex[]; /* flexible-array member */
-		};
-	};
-};
-
-struct knfsd_fh {
-	unsigned int	fh_size;	/* significant for NFSv3.
-					 * Points to the current size while building
-					 * a new file handle
-					 */
-	union {
-		struct nfs_fhbase_old	fh_old;
-		__u32			fh_pad[NFS4_FHSIZE/4];
-		struct nfs_fhbase_new	fh_new;
-	} fh_base;
-};
-
-#define ofh_dcookie		fh_base.fh_old.fb_dcookie
-#define ofh_ino			fh_base.fh_old.fb_ino
-#define ofh_dirino		fh_base.fh_old.fb_dirino
-#define ofh_dev			fh_base.fh_old.fb_dev
-#define ofh_xdev		fh_base.fh_old.fb_xdev
-#define ofh_xino		fh_base.fh_old.fb_xino
-#define ofh_generation		fh_base.fh_old.fb_generation
-
-#define	fh_version		fh_base.fh_new.fb_version
-#define	fh_fsid_type		fh_base.fh_new.fb_fsid_type
-#define	fh_auth_type		fh_base.fh_new.fb_auth_type
-#define	fh_fileid_type		fh_base.fh_new.fb_fileid_type
-#define	fh_fsid			fh_base.fh_new.fb_auth_flex
-
-/* Do not use, provided for userspace compatiblity. */
-#define	fh_auth			fh_base.fh_new.fb_auth
-
-#endif /* _UAPI_LINUX_NFSD_FH_H */

net/sunrpc/addr.c

···
 			      const size_t buflen, const char *delim,
 			      struct sockaddr_in6 *sin6)
 {
-	char *p;
+	char p[IPV6_SCOPE_ID_LEN + 1];
 	size_t len;
+	u32 scope_id = 0;
+	struct net_device *dev;
 
 	if ((buf + buflen) == delim)
 		return 1;
···
 		return 0;
 
 	len = (buf + buflen) - delim - 1;
-	p = kmemdup_nul(delim + 1, len, GFP_KERNEL);
-	if (p) {
-		u32 scope_id = 0;
-		struct net_device *dev;
+	if (len > IPV6_SCOPE_ID_LEN)
+		return 0;
 
-		dev = dev_get_by_name(net, p);
-		if (dev != NULL) {
-			scope_id = dev->ifindex;
-			dev_put(dev);
-		} else {
-			if (kstrtou32(p, 10, &scope_id) != 0) {
-				kfree(p);
-				return 0;
-			}
-		}
+	memcpy(p, delim + 1, len);
+	p[len] = 0;
 
-		kfree(p);
-
-		sin6->sin6_scope_id = scope_id;
-		return 1;
+	dev = dev_get_by_name(net, p);
+	if (dev != NULL) {
+		scope_id = dev->ifindex;
+		dev_put(dev);
+	} else {
+		if (kstrtou32(p, 10, &scope_id) != 0)
+			return 0;
 	}
 
-	return 0;
+	sin6->sin6_scope_id = scope_id;
+	return 1;
 }
 
 static size_t rpc_pton6(struct net *net, const char *buf, const size_t buflen,

net/sunrpc/auth_gss/svcauth_gss.c

···
 	svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
 	xdr_seq = kmalloc(4, GFP_KERNEL);
 	if (!xdr_seq)
-		return -1;
+		return -ENOMEM;
 	*xdr_seq = htonl(seq);
 
 	iov.iov_base = xdr_seq;

net/sunrpc/svc.c

···
 static __printf(2,3) void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) {}
 #endif
 
-static int
-svc_generic_dispatch(struct svc_rqst *rqstp, __be32 *statp)
-{
-	struct kvec *argv = &rqstp->rq_arg.head[0];
-	struct kvec *resv = &rqstp->rq_res.head[0];
-	const struct svc_procedure *procp = rqstp->rq_procinfo;
-
-	/*
-	 * Decode arguments
-	 * XXX: why do we ignore the return value?
-	 */
-	if (procp->pc_decode &&
-	    !procp->pc_decode(rqstp, argv->iov_base)) {
-		*statp = rpc_garbage_args;
-		return 1;
-	}
-
-	*statp = procp->pc_func(rqstp);
-
-	if (*statp == rpc_drop_reply ||
-	    test_bit(RQ_DROPME, &rqstp->rq_flags))
-		return 0;
-
-	if (rqstp->rq_auth_stat != rpc_auth_ok)
-		return 1;
-
-	if (*statp != rpc_success)
-		return 1;
-
-	/* Encode reply */
-	if (procp->pc_encode &&
-	    !procp->pc_encode(rqstp, resv->iov_base + resv->iov_len)) {
-		dprintk("svc: failed to encode reply\n");
-		/* serv->sv_stats->rpcsystemerr++; */
-		*statp = rpc_system_err;
-	}
-	return 1;
-}
-
 __be32
 svc_generic_init_request(struct svc_rqst *rqstp,
 		const struct svc_program *progp,
···
 	__be32			*statp;
 	u32			prog, vers;
 	__be32			rpc_stat;
-	int			auth_res;
+	int			auth_res, rc;
 	__be32			*reply_statp;
 
 	rpc_stat = rpc_success;
···
 		svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
 
 	/* Call the function that processes the request. */
-	if (!process.dispatch) {
-		if (!svc_generic_dispatch(rqstp, statp))
-			goto release_dropit;
-		if (*statp == rpc_garbage_args)
-			goto err_garbage;
-	} else {
-		dprintk("svc: calling dispatcher\n");
-		if (!process.dispatch(rqstp, statp))
-			goto release_dropit; /* Release reply info */
-	}
-
+	rc = process.dispatch(rqstp, statp);
+	if (procp->pc_release)
+		procp->pc_release(rqstp);
+	if (!rc)
+		goto dropit;
 	if (rqstp->rq_auth_stat != rpc_auth_ok)
-		goto err_release_bad_auth;
+		goto err_bad_auth;
 
 	/* Check RPC status result */
 	if (*statp != rpc_success)
 		resv->iov_len = ((void*)statp)  - resv->iov_base + 4;
-
-	/* Release reply info */
-	if (procp->pc_release)
-		procp->pc_release(rqstp);
 
 	if (procp->pc_encode == NULL)
 		goto dropit;
···
 		goto close_xprt;
 	return 1;		/* Caller can now send it */
 
-release_dropit:
-	if (procp->pc_release)
-		procp->pc_release(rqstp);
  dropit:
 	svc_authorise(rqstp);	/* doesn't hurt to call this twice */
 	dprintk("svc: svc_process dropit\n");
···
 	svc_putnl(resv, 2);
 	goto sendit;
 
-err_release_bad_auth:
-	if (procp->pc_release)
-		procp->pc_release(rqstp);
 err_bad_auth:
 	dprintk("svc: authentication failed (%d)\n",
 		be32_to_cpu(rqstp->rq_auth_stat));
···
 /**
  * svc_fill_write_vector - Construct data argument for VFS write call
  * @rqstp: svc_rqst to operate on
- * @pages: list of pages containing data payload
- * @first: buffer containing first section of write payload
- * @total: total number of bytes of write payload
+ * @payload: xdr_buf containing only the write data payload
  *
  * Fills in rqstp::rq_vec, and returns the number of elements.
  */
-unsigned int svc_fill_write_vector(struct svc_rqst *rqstp, struct page **pages,
-				   struct kvec *first, size_t total)
+unsigned int svc_fill_write_vector(struct svc_rqst *rqstp,
+				   struct xdr_buf *payload)
 {
+	struct page **pages = payload->pages;
+	struct kvec *first = payload->head;
 	struct kvec *vec = rqstp->rq_vec;
+	size_t total = payload->len;
 	unsigned int i;
 
 	/* Some types of transport can present the write payload

net/sunrpc/svc_xprt.c

···
 			set_current_state(TASK_RUNNING);
 			return -EINTR;
 		}
+		trace_svc_alloc_arg_err(pages);
 		schedule_timeout(msecs_to_jiffies(500));
 	}
 	rqstp->rq_page_end = &rqstp->rq_pages[pages];

net/sunrpc/xdr.c

···
  * Sets up @subbuf to represent a portion of @xdr. The portion
  * starts at the current offset in @xdr, and extends for a length
  * of @nbytes. If this is successful, @xdr is advanced to the next
- * position following that portion.
+ * XDR data item following that portion.
  *
  * Return values:
  *   %true: @subbuf has been initialized, and @xdr has been advanced.
···
 bool xdr_stream_subsegment(struct xdr_stream *xdr, struct xdr_buf *subbuf,
 			   unsigned int nbytes)
 {
-	unsigned int remaining, offset, len;
+	unsigned int start = xdr_stream_pos(xdr);
+	unsigned int remaining, len;
 
-	if (xdr_buf_subsegment(xdr->buf, subbuf, xdr_stream_pos(xdr), nbytes))
+	/* Extract @subbuf and bounds-check the fn arguments */
+	if (xdr_buf_subsegment(xdr->buf, subbuf, start, nbytes))
 		return false;
 
-	if (subbuf->head[0].iov_len)
-		if (!__xdr_inline_decode(xdr, subbuf->head[0].iov_len))
-			return false;
-
-	remaining = subbuf->page_len;
-	offset = subbuf->page_base;
-	while (remaining) {
-		len = min_t(unsigned int, remaining, PAGE_SIZE) - offset;
-
+	/* Advance @xdr by @nbytes */
+	for (remaining = nbytes; remaining;) {
 		if (xdr->p == xdr->end && !xdr_set_next_buffer(xdr))
 			return false;
-		if (!__xdr_inline_decode(xdr, len))
-			return false;
 
+		len = (char *)xdr->end - (char *)xdr->p;
+		if (remaining <= len) {
+			xdr->p = (__be32 *)((char *)xdr->p +
+					(remaining + xdr_pad_size(nbytes)));
+			break;
+		}
+
+		xdr->p = (__be32 *)((char *)xdr->p + len);
+		xdr->end = xdr->p;
 		remaining -= len;
-		offset = 0;
 	}
 
+	xdr_stream_set_pos(xdr, start + nbytes);
 	return true;
 }
 EXPORT_SYMBOL_GPL(xdr_stream_subsegment);

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c

···
 	/* WARNING: Only wc->wr_cqe and wc->status are reliable */
 	ctxt = container_of(cqe, struct svc_rdma_recv_ctxt, rc_cqe);
 
-	trace_svcrdma_wc_receive(wc, &ctxt->rc_cid);
 	if (wc->status != IB_WC_SUCCESS)
 		goto flushed;
+	trace_svcrdma_wc_recv(wc, &ctxt->rc_cid);
 
 	/* If receive posting fails, the connection is about to be
 	 * lost anyway. The server will not be able to send a reply
···
 	 */
 	if (rdma->sc_pending_recvs < rdma->sc_max_requests)
 		if (!svc_rdma_refresh_recvs(rdma, rdma->sc_recv_batch, false))
-			goto flushed;
+			goto dropped;
 
 	/* All wc fields are now known to be valid */
 	ctxt->rc_byte_len = wc->byte_len;
···
 	return;
 
 flushed:
+	if (wc->status == IB_WC_WR_FLUSH_ERR)
+		trace_svcrdma_wc_recv_flush(wc, &ctxt->rc_cid);
+	else
+		trace_svcrdma_wc_recv_err(wc, &ctxt->rc_cid);
+dropped:
 	svc_rdma_recv_ctxt_put(rdma, ctxt);
 	svc_xprt_deferred_close(&rdma->sc_xprt);
 }

net/sunrpc/xprtrdma/svc_rdma_rw.c

···
 	struct ib_cqe		cc_cqe;
 	struct svcxprt_rdma	*cc_rdma;
 	struct list_head	cc_rwctxts;
+	ktime_t			cc_posttime;
 	int			cc_sqecount;
 	enum ib_wc_status	cc_status;
 	struct completion	cc_done;
···
 	struct svc_rdma_write_info *info =
 			container_of(cc, struct svc_rdma_write_info, wi_cc);
 
-	trace_svcrdma_wc_write(wc, &cc->cc_cid);
+	switch (wc->status) {
+	case IB_WC_SUCCESS:
+		trace_svcrdma_wc_write(wc, &cc->cc_cid);
+		break;
+	case IB_WC_WR_FLUSH_ERR:
+		trace_svcrdma_wc_write_flush(wc, &cc->cc_cid);
+		break;
+	default:
+		trace_svcrdma_wc_write_err(wc, &cc->cc_cid);
+	}
 
 	svc_rdma_wake_send_waiters(rdma, cc->cc_sqecount);
 
···
 	struct ib_cqe *cqe = wc->wr_cqe;
 	struct svc_rdma_chunk_ctxt *cc =
 			container_of(cqe, struct svc_rdma_chunk_ctxt, cc_cqe);
-	struct svcxprt_rdma *rdma = cc->cc_rdma;
+	struct svc_rdma_read_info *info;
 
-	trace_svcrdma_wc_read(wc, &cc->cc_cid);
+	switch (wc->status) {
+	case IB_WC_SUCCESS:
+		info = container_of(cc, struct svc_rdma_read_info, ri_cc);
+		trace_svcrdma_wc_read(wc, &cc->cc_cid, info->ri_totalbytes,
+				      cc->cc_posttime);
+		break;
+	case IB_WC_WR_FLUSH_ERR:
+		trace_svcrdma_wc_read_flush(wc, &cc->cc_cid);
+		break;
+	default:
+		trace_svcrdma_wc_read_err(wc, &cc->cc_cid);
+	}
 
-	svc_rdma_wake_send_waiters(rdma, cc->cc_sqecount);
+	svc_rdma_wake_send_waiters(cc->cc_rdma, cc->cc_sqecount);
 	cc->cc_status = wc->status;
 	complete(&cc->cc_done);
 	return;
···
 	do {
 		if (atomic_sub_return(cc->cc_sqecount,
 				      &rdma->sc_sq_avail) > 0) {
+			cc->cc_posttime = ktime_get();
 			ret = ib_post_send(rdma->sc_qp, first_wr, &bad_wr);
 			if (ret)
 				break;

net/sunrpc/xprtrdma/svc_rdma_sendto.c

···
 	struct svc_rdma_send_ctxt *ctxt =
 		container_of(cqe, struct svc_rdma_send_ctxt, sc_cqe);
 
-	trace_svcrdma_wc_send(wc, &ctxt->sc_cid);
-
 	svc_rdma_wake_send_waiters(rdma, 1);
 	complete(&ctxt->sc_done);
 
 	if (unlikely(wc->status != IB_WC_SUCCESS))
-		svc_xprt_deferred_close(&rdma->sc_xprt);
+		goto flushed;
+
+	trace_svcrdma_wc_send(wc, &ctxt->sc_cid);
+	return;
+
+flushed:
+	if (wc->status != IB_WC_WR_FLUSH_ERR)
+		trace_svcrdma_wc_send_err(wc, &ctxt->sc_cid);
+	else
+		trace_svcrdma_wc_send_flush(wc, &ctxt->sc_cid);
+	svc_xprt_deferred_close(&rdma->sc_xprt);
 }
 
 /**