[PATCH v4 5/9] NFSD: Insulate nfsd4_encode_fattr4() from page boundaries in the encode buffer

[cel@kernel.org]

From: Chuck Lever <chuck.lever@oracle.com>

Commit ab04de60ae1c ("NFSD: Optimize nfsd4_encode_fattr()") replaced
the use of write_bytes_to_xdr_buf() because it's expensive and the
data items to be encoded are already properly aligned.

However, there's no guarantee that the pointer returned from
xdr_reserve_space() will still point to the correct reserved space
in the encode buffer after one or more intervening calls to
xdr_reserve_space(). It just happens to work with the current
implementation of xdr_reserve_space().

This commit effectively reverts the optimization.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4xdr.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index b770225d63dc..d4ee633b01e3 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3506,8 +3506,8 @@ nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 	struct nfsd4_fattr_args args;
 	struct svc_fh *tempfh = NULL;
 	int starting_len = xdr->buf->len;
-	__be32 *attrlen_p, status;
-	int attrlen_offset;
+	unsigned int attrlen_offset;
+	__be32 attrlen, status;
 	u32 attrmask[3];
 	int err;
 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
@@ -3627,9 +3627,8 @@ nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 		goto out;
 
 	/* attr_vals */
-	attrlen_offset = xdr->buf->len;
-	attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
-	if (!attrlen_p)
+	attrlen_offset = xdr_stream_pos(xdr);
+	if (unlikely(!xdr_reserve_space(xdr, XDR_UNIT)))
 		goto out_resource;
 	bitmap_from_arr32(attr_bitmap, attrmask,
 			  ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
@@ -3639,7 +3638,8 @@ nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 		if (status != nfs_ok)
 			goto out;
 	}
-	*attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
+	attrlen = cpu_to_be32(xdr_stream_pos(xdr) - attrlen_offset - XDR_UNIT);
+	write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, XDR_UNIT);
 	status = nfs_ok;
 
 out:
-- 
2.47.0