[XFS] Always use di_forkoff when checking for attr space.

In the case where we mount a filesystem which was previously using the
attr2 format as attr1, returning the default mp->m_attroffset instead of
the per-inode di_forkoff for inline attribute fit calculations, may result
in corruption, if for example, the data fork is already taking more space
than the default fork offset and we try to add an extended attribute. Fix
tested by xfstests/186.

SGI-PV: 979606
SGI-Modid: xfs-linux-melb:xfs-kern:30861a

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Tim Shimmin <tes@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

diff --git a/fs/xfs/xfs_attr_leaf.c b/fs/xfs/xfs_attr_leaf.c
index 96ba6aa4ed8cb8fbbf7132c239d1dd8e3b3086cb..303d41e4217b49590daae8814c3c2c863158c641 100644 (file)
--- a/fs/xfs/xfs_attr_leaf.c
+++ b/fs/xfs/xfs_attr_leaf.c
@@ -166,7 +166,7 @@ xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes)
 
        if (!(mp->m_flags & XFS_MOUNT_ATTR2)) {
                if (bytes <= XFS_IFORK_ASIZE(dp))
-                       return mp->m_attroffset >> 3;
+                       return dp->i_d.di_forkoff;
                return 0;
        }