Commit c7848f69 authored by Trond Myklebust's avatar Trond Myklebust

NFSv4: OPEN must handle the NFS4ERR_IO return code correctly

decode_op_hdr() cannot distinguish between an XDR decoding error and
the perfectly valid errorcode NFS4ERR_IO. This is normally not a
problem, but for the particular case of OPEN, we need to be able
to increment the NFSv4 open sequence id when the server returns
a valid response.
Reported-by: default avatarJ Bruce Fields <bfields@fieldses.org>
Link: http://lkml.kernel.org/r/20131204210356.GA19452@fieldses.orgSigned-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
Cc: stable@vger.kernel.org
parent 374b1057
......@@ -3097,7 +3097,8 @@ static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
return -EIO;
}
static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
int *nfs_retval)
{
__be32 *p;
uint32_t opnum;
......@@ -3107,19 +3108,32 @@ static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
if (unlikely(!p))
goto out_overflow;
opnum = be32_to_cpup(p++);
if (opnum != expected) {
if (unlikely(opnum != expected))
goto out_bad_operation;
nfserr = be32_to_cpup(p);
if (nfserr == NFS_OK)
*nfs_retval = 0;
else
*nfs_retval = nfs4_stat_to_errno(nfserr);
return true;
out_bad_operation:
dprintk("nfs: Server returned operation"
" %d but we issued a request for %d\n",
opnum, expected);
return -EIO;
}
nfserr = be32_to_cpup(p);
if (nfserr != NFS_OK)
return nfs4_stat_to_errno(nfserr);
return 0;
*nfs_retval = -EREMOTEIO;
return false;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
*nfs_retval = -EIO;
return false;
}
static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
{
int retval;
__decode_op_hdr(xdr, expected, &retval);
return retval;
}
/* Dummy routine */
......@@ -5001,10 +5015,11 @@ static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
uint32_t savewords, bmlen, i;
int status;
status = decode_op_hdr(xdr, OP_OPEN);
if (status != -EIO)
if (!__decode_op_hdr(xdr, OP_OPEN, &status))
return status;
nfs_increment_open_seqid(status, res->seqid);
if (!status)
if (status)
return status;
status = decode_stateid(xdr, &res->stateid);
if (unlikely(status))
return status;
......
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