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[PATCH] xfs: failure mapping nfs fh to inode should return ESTALE

To: Alex Elder <aelder@xxxxxxx>, xfs-masters@xxxxxxxxxxx
Subject: [PATCH] xfs: failure mapping nfs fh to inode should return ESTALE
From: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
Date: Thu, 14 Jul 2011 16:50:36 -0400
Cc: xfs@xxxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx
User-agent: Mutt/1.5.20 (2009-06-14)
From: J. Bruce Fields <bfields@xxxxxxxxxx>

On xfs exports, nfsd is incorrectly returning ENOENT instead of ESTALE
on attempts to use a filehandle of a deleted file (spotted with pynfs
test PUTFH3).  The ENOENT was coming from xfs_iget.

(It's tempting to wonder whether we should just map all xfs_iget errors
to ESTALE, but I don't believe so--xfs_iget can also return ENOMEM at
least, which we wouldn't want mapped to ESTALE.)

While we're at it, the other return of ENOENT in xfs_nfs_get_inode()
also looks wrong.

Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
---
 fs/xfs/linux-2.6/xfs_export.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_export.c b/fs/xfs/linux-2.6/xfs_export.c
index f4f878f..75e5d32 100644
--- a/fs/xfs/linux-2.6/xfs_export.c
+++ b/fs/xfs/linux-2.6/xfs_export.c
@@ -151,14 +151,14 @@ xfs_nfs_get_inode(
                 * We don't use ESTALE directly down the chain to not
                 * confuse applications using bulkstat that expect EINVAL.
                 */
-               if (error == EINVAL)
+               if (error == EINVAL || error == ENOENT)
                        error = ESTALE;
                return ERR_PTR(-error);
        }
 
        if (ip->i_d.di_gen != generation) {
                IRELE(ip);
-               return ERR_PTR(-ENOENT);
+               return ERR_PTR(-ESTALE);
        }
 
        return VFS_I(ip);
-- 
1.7.4.1

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