3.5.7.27 -stable review patch. If anyone has any objections, please let me know.
------------------
From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
commit 365da4adebb1c012febf81019ad3dc5bb52e2a13 upstream.
This fixes a regression from 247500820ebd02ad87525db5d9b199e5b66f6636
"nfsd4: fix decoding of compounds across page boundaries". The previous
code was correct: argp->pagelist is initialized in
nfs4svc_deocde_compoundargs to rqstp->rq_arg.pages, and is therefore a
pointer to the page *after* the page we are currently decoding.
The reason that patch nevertheless fixed a problem with decoding
compounds containing write was a bug in the write decoding introduced by
5a80a54d21c96590d013378d8c5f65f879451ab4 "nfsd4: reorganize write
decoding", after which write decoding no longer adhered to the rule that
argp->pagelist point to the next page.
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
[ luis: backported to 3.5: simply revert 2475008 "nfsd4: fix decoding of
compounds across page boundaries":
- adjusted 1st hunk to modify read_buf() instead of next_decode_page()
- dropped 2nd hunk ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
fs/nfsd/nfs4xdr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 65ed9bf..b2ae2da 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -161,8 +161,8 @@ static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
*/
memcpy(p, argp->p, avail);
/* step to next page */
- argp->pagelist++;
argp->p = page_address(argp->pagelist[0]);
+ argp->pagelist++;
if (argp->pagelen < PAGE_SIZE) {
argp->end = argp->p + (argp->pagelen>>2);
argp->pagelen = 0;
--
1.8.3.2
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