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pnfs: check that partial LAYOUTGET return is ignored

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Either a bad server reply, or our ignoring of multiple array segments in
a reply, can cause a reply to not meet our requirements.  Ensure
that we ignore such replies.

Signed-off-by: Fred Isaman <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
This commit is contained in:
Fred Isaman 2011-01-06 11:36:27 +00:00 • committed by Trond Myklebust
commit fc1794c5b0
1 changed files with 11 additions and 0 deletions
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11
fs/nfs/pnfs.c
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@ -660,6 +660,17 @@ pnfs_layout_process(struct nfs4_layoutget *lgp)
struct inode *ino = lo->plh_inode;
int status = 0;
/* Verify we got what we asked for.
* Note that because the xdr parsing only accepts a single
* element array, this can fail even if the server is behaving
* correctly.
*/
if (lgp->args.range.iomode > res->range.iomode ||
res->range.offset != 0 ||
res->range.length != NFS4_MAX_UINT64) {
status = -EINVAL;
goto out;
}
/* Inject layout blob into I/O device driver */
lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res);
if (!lseg || IS_ERR(lseg)) {