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nfsd4: fix xdr decoding of large non-write compounds 

This fixes a regression from 247500820e
"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
5a80a54d21 "nfsd4: reorganize write
decoding", after which write decoding no longer adhered to the rule that
argp->pagelist point to the next page.

Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2013-11-19 17:32:43 -05:00
parent 987da47910
commit 365da4adeb
1 changed files with 2 additions and 1 deletions
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3
fs/nfsd/nfs4xdr.c
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@ -141,8 +141,8 @@ xdr_error: \
static void next_decode_page(struct nfsd4_compoundargs *argp)
{
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;
@ -1229,6 +1229,7 @@ nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
len -= pages * PAGE_SIZE;
argp->p = (__be32 *)page_address(argp->pagelist[0]);
argp->pagelist++;
argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
}
argp->p += XDR_QUADLEN(len);