Merge tag 'nfs-rdma-for-5.1-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

NFSoRDMA client updates for 5.1

New features:
- Convert rpc auth layer to use xdr_streams
- Config option to disable insecure enctypes
- Reduce size of RPC receive buffers

Bugfixes and cleanups:
- Fix sparse warnings
- Check inline size before providing a write chunk
- Reduce the receive doorbell rate
- Various tracepoint improvements

[Trond: Fix up merge conflicts]
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

9 files changed, 406 insertions, 654 deletions

diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index a87a56273407..06233bfa6d73 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -72,16 +72,6 @@ static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p)
 	return xdr_ressize_check(rqstp, p);
 }
 
-static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes)
-{
-	__be32 *p;
-
-	p = xdr_inline_decode(xdr, nbytes);
-	if (unlikely(p == NULL))
-		printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
-	return p;
-}
-
 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
 		const char **str, size_t maxlen)
 {
@@ -98,13 +88,13 @@ static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
 {
 	__be32 *p;
 
-	p = read_buf(xdr, 4);
+	p = xdr_inline_decode(xdr, 4);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE);
 	fh->size = ntohl(*p);
 	if (fh->size > NFS4_FHSIZE)
 		return htonl(NFS4ERR_BADHANDLE);
-	p = read_buf(xdr, fh->size);
+	p = xdr_inline_decode(xdr, fh->size);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE);
 	memcpy(&fh->data[0], p, fh->size);
@@ -117,11 +107,11 @@ static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
 	__be32 *p;
 	unsigned int attrlen;
 
-	p = read_buf(xdr, 4);
+	p = xdr_inline_decode(xdr, 4);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE);
 	attrlen = ntohl(*p);
-	p = read_buf(xdr, attrlen << 2);
+	p = xdr_inline_decode(xdr, attrlen << 2);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE);
 	if (likely(attrlen > 0))
@@ -135,7 +125,7 @@ static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
 {
 	__be32 *p;
 
-	p = read_buf(xdr, NFS4_STATEID_SIZE);
+	p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE);
 	memcpy(stateid->data, p, NFS4_STATEID_SIZE);
@@ -156,7 +146,7 @@ static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound
 	status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
 	if (unlikely(status != 0))
 		return status;
-	p = read_buf(xdr, 12);
+	p = xdr_inline_decode(xdr, 12);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE);
 	hdr->minorversion = ntohl(*p++);
@@ -176,7 +166,7 @@ static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound
 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
 {
 	__be32 *p;
-	p = read_buf(xdr, 4);
+	p = xdr_inline_decode(xdr, 4);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE_HDR);
 	*op = ntohl(*p);
@@ -205,7 +195,7 @@ static __be32 decode_recall_args(struct svc_rqst *rqstp,
 	status = decode_delegation_stateid(xdr, &args->stateid);
 	if (unlikely(status != 0))
 		return status;
-	p = read_buf(xdr, 4);
+	p = xdr_inline_decode(xdr, 4);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE);
 	args->truncate = ntohl(*p);
@@ -227,7 +217,7 @@ static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
 	__be32 status = 0;
 	uint32_t iomode;
 
-	p = read_buf(xdr, 4 * sizeof(uint32_t));
+	p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t));
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_BADXDR);
 
@@ -245,14 +235,14 @@ static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
 		if (unlikely(status != 0))
 			return status;
 
-		p = read_buf(xdr, 2 * sizeof(uint64_t));
+		p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
 		if (unlikely(p == NULL))
 			return htonl(NFS4ERR_BADXDR);
 		p = xdr_decode_hyper(p, &args->cbl_range.offset);
 		p = xdr_decode_hyper(p, &args->cbl_range.length);
 		return decode_layout_stateid(xdr, &args->cbl_stateid);
 	} else if (args->cbl_recall_type == RETURN_FSID) {
-		p = read_buf(xdr, 2 * sizeof(uint64_t));
+		p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
 		if (unlikely(p == NULL))
 			return htonl(NFS4ERR_BADXDR);
 		p = xdr_decode_hyper(p, &args->cbl_fsid.major);
@@ -275,7 +265,7 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
 	args->ndevs = 0;
 
 	/* Num of device notifications */
-	p = read_buf(xdr, sizeof(uint32_t));
+	p = xdr_inline_decode(xdr, sizeof(uint32_t));
 	if (unlikely(p == NULL)) {
 		status = htonl(NFS4ERR_BADXDR);
 		goto out;
@@ -298,7 +288,8 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
 	for (i = 0; i < n; i++) {
 		struct cb_devicenotifyitem *dev = &args->devs[i];
 
-		p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
+		p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) +
+				      NFS4_DEVICEID4_SIZE);
 		if (unlikely(p == NULL)) {
 			status = htonl(NFS4ERR_BADXDR);
 			goto err;
@@ -329,7 +320,7 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
 		p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
 
 		if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
-			p = read_buf(xdr, sizeof(uint32_t));
+			p = xdr_inline_decode(xdr, sizeof(uint32_t));
 			if (unlikely(p == NULL)) {
 				status = htonl(NFS4ERR_BADXDR);
 				goto err;
@@ -359,7 +350,7 @@ static __be32 decode_sessionid(struct xdr_stream *xdr,
 {
 	__be32 *p;
 
-	p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
+	p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE);
 
@@ -379,13 +370,13 @@ static __be32 decode_rc_list(struct xdr_stream *xdr,
 		goto out;
 
 	status = htonl(NFS4ERR_RESOURCE);
-	p = read_buf(xdr, sizeof(uint32_t));
+	p = xdr_inline_decode(xdr, sizeof(uint32_t));
 	if (unlikely(p == NULL))
 		goto out;
 
 	rc_list->rcl_nrefcalls = ntohl(*p++);
 	if (rc_list->rcl_nrefcalls) {
-		p = read_buf(xdr,
+		p = xdr_inline_decode(xdr,
 			     rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
 		if (unlikely(p == NULL))
 			goto out;
@@ -418,7 +409,7 @@ static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
 	if (status)
 		return status;
 
-	p = read_buf(xdr, 5 * sizeof(uint32_t));
+	p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t));
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE);
 
@@ -461,7 +452,7 @@ static __be32 decode_recallany_args(struct svc_rqst *rqstp,
 	uint32_t bitmap[2];
 	__be32 *p, status;
 
-	p = read_buf(xdr, 4);
+	p = xdr_inline_decode(xdr, 4);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_BADXDR);
 	args->craa_objs_to_keep = ntohl(*p++);
@@ -480,7 +471,7 @@ static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
 	struct cb_recallslotargs *args = argp;
 	__be32 *p;
 
-	p = read_buf(xdr, 4);
+	p = xdr_inline_decode(xdr, 4);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_BADXDR);
 	args->crsa_target_highest_slotid = ntohl(*p++);
@@ -492,14 +483,14 @@ static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_arg
 	__be32		*p;
 	unsigned int	len;
 
-	p = read_buf(xdr, 12);
+	p = xdr_inline_decode(xdr, 12);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_BADXDR);
 
 	p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
 	len = be32_to_cpu(*p);
 
-	p = read_buf(xdr, len);
+	p = xdr_inline_decode(xdr, len);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_BADXDR);
 
@@ -537,7 +528,7 @@ static __be32 decode_write_response(struct xdr_stream *xdr,
 	__be32 *p;
 
 	/* skip the always zero field */
-	p = read_buf(xdr, 4);
+	p = xdr_inline_decode(xdr, 4);
 	if (unlikely(!p))
 		goto out;
 	p++;
@@ -577,7 +568,7 @@ static __be32 decode_offload_args(struct svc_rqst *rqstp,
 		return status;
 
 	/* decode status */
-	p = read_buf(xdr, 4);
+	p = xdr_inline_decode(xdr, 4);
 	if (unlikely(!p))
 		goto out;
 	args->error = ntohl(*p++);
@@ -943,10 +934,11 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
 	};
 	unsigned int nops = 0;
 
-	xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
+	xdr_init_decode(&xdr_in, &rqstp->rq_arg,
+			rqstp->rq_arg.head[0].iov_base, NULL);
 
 	p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
-	xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
+	xdr_init_encode(&xdr_out, &rqstp->rq_res, p, NULL);
 
 	status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
 	if (status == htonl(NFS4ERR_RESOURCE))
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index 63abe705f4ca..32701b6a9566 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -2036,7 +2036,7 @@ ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
 
 	dprintk("%s: Begin\n", __func__);
 
-	xdr_init_encode(&tmp_xdr, &tmp_buf, NULL);
+	xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
 
 	ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
 	ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c
index 350675e3ed47..a7ed29de0a40 100644
--- a/fs/nfs/nfs2xdr.c
+++ b/fs/nfs/nfs2xdr.c
@@ -22,6 +22,7 @@
 #include <linux/nfs.h>
 #include <linux/nfs2.h>
 #include <linux/nfs_fs.h>
+#include "nfstrace.h"
 #include "internal.h"
 
 #define NFSDBG_FACILITY		NFSDBG_XDR
@@ -55,42 +56,16 @@
 
 #define NFS_attrstat_sz		(1+NFS_fattr_sz)
 #define NFS_diropres_sz		(1+NFS_fhandle_sz+NFS_fattr_sz)
-#define NFS_readlinkres_sz	(2)
-#define NFS_readres_sz		(1+NFS_fattr_sz+1)
+#define NFS_readlinkres_sz	(2+1)
+#define NFS_readres_sz		(1+NFS_fattr_sz+1+1)
 #define NFS_writeres_sz         (NFS_attrstat_sz)
 #define NFS_stat_sz		(1)
-#define NFS_readdirres_sz	(1)
+#define NFS_readdirres_sz	(1+1)
 #define NFS_statfsres_sz	(1+NFS_info_sz)
 
 static int nfs_stat_to_errno(enum nfs_stat);
 
 /*
- * While encoding arguments, set up the reply buffer in advance to
- * receive reply data directly into the page cache.
- */
-static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
-				 unsigned int base, unsigned int len,
-				 unsigned int bufsize)
-{
-	struct rpc_auth	*auth = req->rq_cred->cr_auth;
-	unsigned int replen;
-
-	replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
-	xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
-}
-
-/*
- * Handle decode buffer overflows out-of-line.
- */
-static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
-{
-	dprintk("NFS: %s prematurely hit the end of our receive buffer. "
-		"Remaining buffer length is %tu words.\n",
-		func, xdr->end - xdr->p);
-}
-
-
-/*
  * Encode/decode NFSv2 basic data types
  *
  * Basic NFSv2 data types are defined in section 2.3 of RFC 1094:
@@ -110,8 +85,8 @@ static int decode_nfsdata(struct xdr_stream *xdr, struct nfs_pgio_res *result)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	count = be32_to_cpup(p);
 	recvd = xdr_read_pages(xdr, count);
 	if (unlikely(count > recvd))
@@ -125,9 +100,6 @@ out_cheating:
 		"count %u > recvd %u\n", count, recvd);
 	count = recvd;
 	goto out;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -157,13 +129,16 @@ static int decode_stat(struct xdr_stream *xdr, enum nfs_stat *status)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
+	if (unlikely(*p != cpu_to_be32(NFS_OK)))
+		goto out_status;
+	*status = 0;
+	return 0;
+out_status:
 	*status = be32_to_cpup(p);
+	trace_nfs_xdr_status((int)*status);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -205,14 +180,11 @@ static int decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, NFS2_FHSIZE);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	fh->size = NFS2_FHSIZE;
 	memcpy(fh->data, p, NFS2_FHSIZE);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -282,8 +254,8 @@ static int decode_fattr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, NFS_fattr_sz << 2);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 
 	fattr->valid |= NFS_ATTR_FATTR_V2;
 
@@ -325,9 +297,6 @@ out_uid:
 out_gid:
 	dprintk("NFS: returned invalid gid\n");
 	return -EINVAL;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -416,23 +385,20 @@ static int decode_filename_inline(struct xdr_stream *xdr,
 	u32 count;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	count = be32_to_cpup(p);
 	if (count > NFS3_MAXNAMLEN)
 		goto out_nametoolong;
 	p = xdr_inline_decode(xdr, count);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	*name = (const char *)p;
 	*length = count;
 	return 0;
 out_nametoolong:
 	dprintk("NFS: returned filename too long: %u\n", count);
 	return -ENAMETOOLONG;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -455,8 +421,8 @@ static int decode_path(struct xdr_stream *xdr)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	length = be32_to_cpup(p);
 	if (unlikely(length >= xdr->buf->page_len || length > NFS_MAXPATHLEN))
 		goto out_size;
@@ -472,9 +438,6 @@ out_cheating:
 	dprintk("NFS: server cheating in pathname result: "
 		"length %u > received %u\n", length, recvd);
 	return -EIO;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -615,8 +578,8 @@ static void nfs2_xdr_enc_readlinkargs(struct rpc_rqst *req,
 	const struct nfs_readlinkargs *args = data;
 
 	encode_fhandle(xdr, args->fh);
-	prepare_reply_buffer(req, args->pages, args->pgbase,
-					args->pglen, NFS_readlinkres_sz);
+	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
+				args->pglen, NFS_readlinkres_sz);
 }
 
 /*
@@ -651,8 +614,8 @@ static void nfs2_xdr_enc_readargs(struct rpc_rqst *req,
 	const struct nfs_pgio_args *args = data;
 
 	encode_readargs(xdr, args);
-	prepare_reply_buffer(req, args->pages, args->pgbase,
-					args->count, NFS_readres_sz);
+	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
+				args->count, NFS_readres_sz);
 	req->rq_rcv_buf.flags |= XDRBUF_READ;
 }
 
@@ -809,8 +772,8 @@ static void nfs2_xdr_enc_readdirargs(struct rpc_rqst *req,
 	const struct nfs_readdirargs *args = data;
 
 	encode_readdirargs(xdr, args);
-	prepare_reply_buffer(req, args->pages, 0,
-					args->count, NFS_readdirres_sz);
+	rpc_prepare_reply_pages(req, args->pages, 0,
+				args->count, NFS_readdirres_sz);
 }
 
 /*
@@ -951,12 +914,12 @@ int nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
 	int error;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EAGAIN;
 	if (*p++ == xdr_zero) {
 		p = xdr_inline_decode(xdr, 4);
-		if (unlikely(p == NULL))
-			goto out_overflow;
+		if (unlikely(!p))
+			return -EAGAIN;
 		if (*p++ == xdr_zero)
 			return -EAGAIN;
 		entry->eof = 1;
@@ -964,8 +927,8 @@ int nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
 	}
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EAGAIN;
 	entry->ino = be32_to_cpup(p);
 
 	error = decode_filename_inline(xdr, &entry->name, &entry->len);
@@ -978,17 +941,13 @@ int nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
 	 */
 	entry->prev_cookie = entry->cookie;
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EAGAIN;
 	entry->cookie = be32_to_cpup(p);
 
 	entry->d_type = DT_UNKNOWN;
 
 	return 0;
-
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EAGAIN;
 }
 
 /*
@@ -1052,17 +1011,14 @@ static int decode_info(struct xdr_stream *xdr, struct nfs2_fsstat *result)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, NFS_info_sz << 2);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	result->tsize  = be32_to_cpup(p++);
 	result->bsize  = be32_to_cpup(p++);
 	result->blocks = be32_to_cpup(p++);
 	result->bfree  = be32_to_cpup(p++);
 	result->bavail = be32_to_cpup(p);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 static int nfs2_xdr_dec_statfsres(struct rpc_rqst *req, struct xdr_stream *xdr,
diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index 78df4eb60f85..110358f4986d 100644
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -21,6 +21,7 @@
 #include <linux/nfs3.h>
 #include <linux/nfs_fs.h>
 #include <linux/nfsacl.h>
+#include "nfstrace.h"
 #include "internal.h"
 
 #define NFSDBG_FACILITY		NFSDBG_XDR
@@ -68,13 +69,13 @@
 #define NFS3_removeres_sz	(NFS3_setattrres_sz)
 #define NFS3_lookupres_sz	(1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
 #define NFS3_accessres_sz	(1+NFS3_post_op_attr_sz+1)
-#define NFS3_readlinkres_sz	(1+NFS3_post_op_attr_sz+1)
-#define NFS3_readres_sz		(1+NFS3_post_op_attr_sz+3)
+#define NFS3_readlinkres_sz	(1+NFS3_post_op_attr_sz+1+1)
+#define NFS3_readres_sz		(1+NFS3_post_op_attr_sz+3+1)
 #define NFS3_writeres_sz	(1+NFS3_wcc_data_sz+4)
 #define NFS3_createres_sz	(1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
 #define NFS3_renameres_sz	(1+(2 * NFS3_wcc_data_sz))
 #define NFS3_linkres_sz		(1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
-#define NFS3_readdirres_sz	(1+NFS3_post_op_attr_sz+2)
+#define NFS3_readdirres_sz	(1+NFS3_post_op_attr_sz+2+1)
 #define NFS3_fsstatres_sz	(1+NFS3_post_op_attr_sz+13)
 #define NFS3_fsinfores_sz	(1+NFS3_post_op_attr_sz+12)
 #define NFS3_pathconfres_sz	(1+NFS3_post_op_attr_sz+6)
@@ -84,7 +85,7 @@
 #define ACL3_setaclargs_sz	(NFS3_fh_sz+1+ \
 				XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
 #define ACL3_getaclres_sz	(1+NFS3_post_op_attr_sz+1+ \
-				XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
+				XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+1)
 #define ACL3_setaclres_sz	(1+NFS3_post_op_attr_sz)
 
 static int nfs3_stat_to_errno(enum nfs_stat);
@@ -104,32 +105,6 @@ static const umode_t nfs_type2fmt[] = {
 };
 
 /*
- * While encoding arguments, set up the reply buffer in advance to
- * receive reply data directly into the page cache.
- */
-static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
-				 unsigned int base, unsigned int len,
-				 unsigned int bufsize)
-{
-	struct rpc_auth	*auth = req->rq_cred->cr_auth;
-	unsigned int replen;
-
-	replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
-	xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
-}
-
-/*
- * Handle decode buffer overflows out-of-line.
- */
-static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
-{
-	dprintk("NFS: %s prematurely hit the end of our receive buffer. "
-		"Remaining buffer length is %tu words.\n",
-		func, xdr->end - xdr->p);
-}
-
-
-/*
  * Encode/decode NFSv3 basic data types
  *
  * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
@@ -151,13 +126,10 @@ static int decode_uint32(struct xdr_stream *xdr, u32 *value)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	*value = be32_to_cpup(p);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
@@ -165,13 +137,10 @@ static int decode_uint64(struct xdr_stream *xdr, u64 *value)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 8);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	xdr_decode_hyper(p, value);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -211,14 +180,14 @@ static int decode_inline_filename3(struct xdr_stream *xdr,
 	u32 count;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	count = be32_to_cpup(p);
 	if (count > NFS3_MAXNAMLEN)
 		goto out_nametoolong;
 	p = xdr_inline_decode(xdr, count);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	*name = (const char *)p;
 	*length = count;
 	return 0;
@@ -226,9 +195,6 @@ static int decode_inline_filename3(struct xdr_stream *xdr,
 out_nametoolong:
 	dprintk("NFS: returned filename too long: %u\n", count);
 	return -ENAMETOOLONG;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -249,8 +215,8 @@ static int decode_nfspath3(struct xdr_stream *xdr)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	count = be32_to_cpup(p);
 	if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
 		goto out_nametoolong;
@@ -267,9 +233,6 @@ out_cheating:
 	dprintk("NFS: server cheating in pathname result: "
 		"count %u > recvd %u\n", count, recvd);
 	return -EIO;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -303,13 +266,10 @@ static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -330,13 +290,10 @@ static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -364,13 +321,16 @@ static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
+	if (unlikely(*p != cpu_to_be32(NFS3_OK)))
+		goto out_status;
+	*status = 0;
+	return 0;
+out_status:
 	*status = be32_to_cpup(p);
+	trace_nfs_xdr_status((int)*status);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -453,23 +413,20 @@ static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	length = be32_to_cpup(p++);
 	if (unlikely(length > NFS3_FHSIZE))
 		goto out_toobig;
 	p = xdr_inline_decode(xdr, length);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	fh->size = length;
 	memcpy(fh->data, p, length);
 	return 0;
 out_toobig:
 	dprintk("NFS: file handle size (%u) too big\n", length);
 	return -E2BIG;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 static void zero_nfs_fh3(struct nfs_fh *fh)
@@ -655,8 +612,8 @@ static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 
 	p = xdr_decode_ftype3(p, &fmode);
 
@@ -690,9 +647,6 @@ out_uid:
 out_gid:
 	dprintk("NFS: returned invalid gid\n");
 	return -EINVAL;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -710,14 +664,11 @@ static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	if (*p != xdr_zero)
 		return decode_fattr3(xdr, fattr);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -733,8 +684,8 @@ static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 
 	fattr->valid |= NFS_ATTR_FATTR_PRESIZE
 		| NFS_ATTR_FATTR_PRECHANGE
@@ -747,9 +698,6 @@ static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 	fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
 
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -773,14 +721,11 @@ static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	if (*p != xdr_zero)
 		return decode_wcc_attr(xdr, fattr);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
@@ -808,15 +753,12 @@ out:
 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
 {
 	__be32 *p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	if (*p != xdr_zero)
 		return decode_nfs_fh3(xdr, fh);
 	zero_nfs_fh3(fh);
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 /*
@@ -953,8 +895,8 @@ static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
 	const struct nfs3_readlinkargs *args = data;
 
 	encode_nfs_fh3(xdr, args->fh);
-	prepare_reply_buffer(req, args->pages, args->pgbase,
-					args->pglen, NFS3_readlinkres_sz);
+	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
+				args->pglen, NFS3_readlinkres_sz);
 }
 
 /*
@@ -986,8 +928,8 @@ static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
 	unsigned int replen = args->replen ? args->replen : NFS3_readres_sz;
 
 	encode_read3args(xdr, args);
-	prepare_reply_buffer(req, args->pages, args->pgbase,
-					args->count, replen);
+	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
+				args->count, replen);
 	req->rq_rcv_buf.flags |= XDRBUF_READ;
 }
 
@@ -1279,7 +1221,7 @@ static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
 	const struct nfs3_readdirargs *args = data;
 
 	encode_readdir3args(xdr, args);
-	prepare_reply_buffer(req, args->pages, 0,
+	rpc_prepare_reply_pages(req, args->pages, 0,
 				args->count, NFS3_readdirres_sz);
 }
 
@@ -1321,7 +1263,7 @@ static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
 	const struct nfs3_readdirargs *args = data;
 
 	encode_readdirplus3args(xdr, args);
-	prepare_reply_buffer(req, args->pages, 0,
+	rpc_prepare_reply_pages(req, args->pages, 0,
 				args->count, NFS3_readdirres_sz);
 }
 
@@ -1366,7 +1308,7 @@ static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
 	encode_nfs_fh3(xdr, args->fh);
 	encode_uint32(xdr, args->mask);
 	if (args->mask & (NFS_ACL | NFS_DFACL)) {
-		prepare_reply_buffer(req, args->pages, 0,
+		rpc_prepare_reply_pages(req, args->pages, 0,
 					NFSACL_MAXPAGES << PAGE_SHIFT,
 					ACL3_getaclres_sz);
 		req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
@@ -1643,8 +1585,8 @@ static int decode_read3resok(struct xdr_stream *xdr,
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4 + 4 + 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	count = be32_to_cpup(p++);
 	eof = be32_to_cpup(p++);
 	ocount = be32_to_cpup(p++);
@@ -1667,9 +1609,6 @@ out_cheating:
 	count = recvd;
 	eof = 0;
 	goto out;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
@@ -1690,7 +1629,7 @@ static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
 	result->op_status = status;
 	if (status != NFS3_OK)
 		goto out_status;
-	result->replen = 3 + ((xdr_stream_pos(xdr) - pos) >> 2);
+	result->replen = 4 + ((xdr_stream_pos(xdr) - pos) >> 2);
 	error = decode_read3resok(xdr, result);
 out:
 	return error;
@@ -1731,22 +1670,18 @@ static int decode_write3resok(struct xdr_stream *xdr,
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4 + 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	result->count = be32_to_cpup(p++);
 	result->verf->committed = be32_to_cpup(p++);
 	if (unlikely(result->verf->committed > NFS_FILE_SYNC))
 		goto out_badvalue;
 	if (decode_writeverf3(xdr, &result->verf->verifier))
-		goto out_eio;
+		return -EIO;
 	return result->count;
 out_badvalue:
 	dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
 	return -EIO;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-out_eio:
-	return -EIO;
 }
 
 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
@@ -2010,12 +1945,12 @@ int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
 	u64 new_cookie;
 
 	p = xdr_inline_decode(xdr, 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EAGAIN;
 	if (*p == xdr_zero) {
 		p = xdr_inline_decode(xdr, 4);
-		if (unlikely(p == NULL))
-			goto out_overflow;
+		if (unlikely(!p))
+			return -EAGAIN;
 		if (*p == xdr_zero)
 			return -EAGAIN;
 		entry->eof = 1;
@@ -2051,8 +1986,8 @@ int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
 
 		/* In fact, a post_op_fh3: */
 		p = xdr_inline_decode(xdr, 4);
-		if (unlikely(p == NULL))
-			goto out_overflow;
+		if (unlikely(!p))
+			return -EAGAIN;
 		if (*p != xdr_zero) {
 			error = decode_nfs_fh3(xdr, entry->fh);
 			if (unlikely(error)) {
@@ -2069,9 +2004,6 @@ int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
 
 	return 0;
 
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EAGAIN;
 out_truncated:
 	dprintk("NFS: directory entry contains invalid file handle\n");
 	*entry = old;
@@ -2183,8 +2115,8 @@ static int decode_fsstat3resok(struct xdr_stream *xdr,
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 8 * 6 + 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	p = xdr_decode_size3(p, &result->tbytes);
 	p = xdr_decode_size3(p, &result->fbytes);
 	p = xdr_decode_size3(p, &result->abytes);
@@ -2193,9 +2125,6 @@ static int decode_fsstat3resok(struct xdr_stream *xdr,
 	xdr_decode_size3(p, &result->afiles);
 	/* ignore invarsec */
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
@@ -2255,8 +2184,8 @@ static int decode_fsinfo3resok(struct xdr_stream *xdr,
 	__be32 *p;
 
 	p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
-	if (unlikely(p == NULL))
-		goto out_overflow;
+	if (unlikely(!p))
+		return -EIO;
 	result->rtmax  = be32_to_cpup(p++);
 	result->rtpref = be32_to_cpup(p++);
 	result->rtmult = be32_to_cpup(p++);
@@ -2270,9 +2199,6 @@ static int decode_fsinfo3resok(struct xdr_stream *xdr,
 	/* ignore properties */
 	result->lease_time = 0;
 	return 0;
-out_overflow:
-	print_overflow_msg(__func__, xdr);
-	return -EIO;
 }
 
 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,<