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authorEric Sandeen <sandeen@redhat.com>2016-12-09 16:49:47 +1100
committerDave Chinner <david@fromorbit.com>2016-12-09 16:49:47 +1100
commit2e1d23370e75d7d89350d41b4ab58c7f6a0e26b2 (patch)
treeb1cbc57ba436ab8457c8603c90ac6092ead1b194 /fs/xfs
parentacdda3aae146d9b69d30e9d8a32a8d8937055523 (diff)
downloadlinux-2e1d23370e75d7d89350d41b4ab58c7f6a0e26b2.tar.bz2
xfs: ignore leaf attr ichdr.count in verifier during log replay
When we create a new attribute, we first create a shortform attribute, and try to fit the new attribute into it. If that fails, we copy the (empty) attribute into a leaf attribute, and do the copy again. Thus there can be a transient state where we have an empty leaf attribute. If we encounter this during log replay, the verifier will fail. So add a test to ignore this part of the leaf attr verification during log replay. Thanks as usual to dchinner for spotting the problem. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/libxfs/xfs_attr_leaf.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
index 8ea91f363093..2852521fc8ec 100644
--- a/fs/xfs/libxfs/xfs_attr_leaf.c
+++ b/fs/xfs/libxfs/xfs_attr_leaf.c
@@ -253,6 +253,7 @@ xfs_attr3_leaf_verify(
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_attr_leafblock *leaf = bp->b_addr;
+ struct xfs_perag *pag = bp->b_pag;
struct xfs_attr3_icleaf_hdr ichdr;
xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
@@ -273,7 +274,12 @@ xfs_attr3_leaf_verify(
if (ichdr.magic != XFS_ATTR_LEAF_MAGIC)
return false;
}
- if (ichdr.count == 0)
+ /*
+ * In recovery there is a transient state where count == 0 is valid
+ * because we may have transitioned an empty shortform attr to a leaf
+ * if the attr didn't fit in shortform.
+ */
+ if (pag && pag->pagf_init && ichdr.count == 0)
return false;
/* XXX: need to range check rest of attr header values */