The child buffer read in xfs_attr3_node_inactive() should never
reach a hole in the attr fork. If this occurs, it is likely due to a
bug. Prior to commit cd87d867 ("xfs: don't crash on unexpected holes
in dir/attr btrees"), this would result in a crash. Now that the
crash has been fixed, this is a silent failure.
Pass -1 to xfs_da3_node_read() from xfs_da3_node_inactive() to
indicate that reading from a hole is an error. This logs an error to
syslog and fails the inode inactivation, leaving the inode on the AG
unlinked list until removed by xfs_repair (or log recovery). Also
update the subsequent code to reflect that the read now returns a
non-NULL buffer or an error.
Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
---
fs/xfs/xfs_attr_inactive.c | 69 ++++++++++++++++++++++------------------------
1 file changed, 33 insertions(+), 36 deletions(-)
diff --git a/fs/xfs/xfs_attr_inactive.c b/fs/xfs/xfs_attr_inactive.c
index e3a950e..52818ea 100644
--- a/fs/xfs/xfs_attr_inactive.c
+++ b/fs/xfs/xfs_attr_inactive.c
@@ -251,47 +251,44 @@ xfs_attr3_node_inactive(
* traversal of the tree so we may deal with many blocks
* before we come back to this one.
*/
- error = xfs_da3_node_read(*trans, dp, child_fsb, -2, &child_bp,
- XFS_ATTR_FORK);
+ error = xfs_da3_node_read(*trans, dp, child_fsb, -1, &child_bp,
+ XFS_ATTR_FORK);
if (error)
return error;
- if (child_bp) {
- /* save for re-read later */
- child_blkno = XFS_BUF_ADDR(child_bp);
- /*
- * Invalidate the subtree, however we have to.
- */
- info = child_bp->b_addr;
- switch (info->magic) {
- case cpu_to_be16(XFS_DA_NODE_MAGIC):
- case cpu_to_be16(XFS_DA3_NODE_MAGIC):
- error = xfs_attr3_node_inactive(trans, dp,
- child_bp, level + 1);
- break;
- case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
- case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
- error = xfs_attr3_leaf_inactive(trans, dp,
- child_bp);
- break;
- default:
- error = -EIO;
- xfs_trans_brelse(*trans, child_bp);
- break;
- }
- if (error)
- return error;
+ /* save for re-read later */
+ child_blkno = XFS_BUF_ADDR(child_bp);
- /*
- * Remove the subsidiary block from the cache
- * and from the log.
- */
- error = xfs_da_get_buf(*trans, dp, 0, child_blkno,
- &child_bp, XFS_ATTR_FORK);
- if (error)
- return error;
- xfs_trans_binval(*trans, child_bp);
+ /*
+ * Invalidate the subtree, however we have to.
+ */
+ info = child_bp->b_addr;
+ switch (info->magic) {
+ case cpu_to_be16(XFS_DA_NODE_MAGIC):
+ case cpu_to_be16(XFS_DA3_NODE_MAGIC):
+ error = xfs_attr3_node_inactive(trans, dp, child_bp,
+ level + 1);
+ break;
+ case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
+ case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
+ error = xfs_attr3_leaf_inactive(trans, dp, child_bp);
+ break;
+ default:
+ error = -EIO;
+ xfs_trans_brelse(*trans, child_bp);
+ break;
}
+ if (error)
+ return error;
+
+ /*
+ * Remove the subsidiary block from the cache and from the log.
+ */
+ error = xfs_da_get_buf(*trans, dp, 0, child_blkno, &child_bp,
+ XFS_ATTR_FORK);
+ if (error)
+ return error;
+ xfs_trans_binval(*trans, child_bp);
/*
* If we're not done, re-read the parent to get the next
--
2.9.5
--
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