Commit 3c382dda authored by Eric Sandeen's avatar Eric Sandeen Committed by Greg Kroah-Hartman

xfs: ignore leaf attr ichdr.count in verifier during log replay

commit 2e1d2337 upstream.

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: default avatarEric Sandeen <sandeen@redhat.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c0020338
......@@ -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 */
......
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