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authorChristoph Hellwig <hch@infradead.org>2009-01-01 14:21:16 -0500
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2009-01-09 15:17:17 +1100
commitc9a98553d513dfc82cdce869970d5662c1f22c68 (patch)
treed68cc98fa807d9f9719cb04307739ab9f9d9b9b5 /fs/xfs
parent9e42d0cf5020aaf217433cad1a224745241d212a (diff)
[XFS] pass XFS_IGET_BULKSTAT to xfs_iget for handle operations
NFS clients or users of the handle ioctls can pass us arbitrary inode numbers through the exportfs interface. Make sure we use the XFS_IGET_BULKSTAT so that these don't cause shutdowns due to the corruption checks. Also translate the EINVAL we get back for invalid inode clusters into an ESTALE which is more appropinquate, and remove the useless check for a NULL inode on a successfull xfs_iget return. I have a testcase to reproduce this using the handle interface which I will submit to xfsqa. Reported-by: Mario Becroft <mb@gem.win.co.nz> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Eric Sandeen <sandeen@sandeen.net> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/linux-2.6/xfs_export.c23
1 files changed, 19 insertions, 4 deletions
diff --git a/fs/xfs/linux-2.6/xfs_export.c b/fs/xfs/linux-2.6/xfs_export.c
index 595751f7835..87b8cbd23d4 100644
--- a/fs/xfs/linux-2.6/xfs_export.c
+++ b/fs/xfs/linux-2.6/xfs_export.c
@@ -126,11 +126,26 @@ xfs_nfs_get_inode(
if (ino == 0)
return ERR_PTR(-ESTALE);
- error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
- if (error)
+ /*
+ * The XFS_IGET_BULKSTAT means that an invalid inode number is just
+ * fine and not an indication of a corrupted filesystem. Because
+ * clients can send any kind of invalid file handle, e.g. after
+ * a restore on the server we have to deal with this case gracefully.
+ */
+ error = xfs_iget(mp, NULL, ino, XFS_IGET_BULKSTAT,
+ XFS_ILOCK_SHARED, &ip, 0);
+ if (error) {
+ /*
+ * EINVAL means the inode cluster doesn't exist anymore.
+ * This implies the filehandle is stale, so we should
+ * translate it here.
+ * We don't use ESTALE directly down the chain to not
+ * confuse applications using bulkstat that expect EINVAL.
+ */
+ if (error == EINVAL)
+ error = ESTALE;
return ERR_PTR(-error);
- if (!ip)
- return ERR_PTR(-EIO);
+ }
if (ip->i_d.di_gen != generation) {
xfs_iput_new(ip, XFS_ILOCK_SHARED);