3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mark Tinguely <tingu...@sgi.com>
commit 997def25e4b9cee3b01609e18a52f926bca8bd2b upstream.
Commit f5ea1100 cleans up the disk to host conversions for
node directory entries, but because a variable is reused in
xfs_node_toosmall() the next node is not correctly found.
If the original node is small enough (<= 3/8 of the node size),
this change may incorrectly cause a node collapse when it should
not. That will cause an assert in xfstest generic/319:
Assertion failed: first <= last && last < BBTOB(bp->b_length),
file: /root/newest/xfs/fs/xfs/xfs_trans_buf.c, line: 569
Keep the original node header to get the correct forward node.
(When a node is considered for a merge with a sibling, it overwrites the
sibling pointers of the original incore nodehdr with the sibling's
pointers. This leads to loop considering the original node as a merge
candidate with itself in the second pass, and so it incorrectly
determines a merge should occur.)
[v3: added Dave Chinner's (slightly modified) suggestion to the commit header,
cleaned up whitespace. -bpm]
Signed-off-by: Mark Tinguely <tingu...@sgi.com>
Reviewed-by: Ben Myers <b...@sgi.com>
Signed-off-by: Ben Myers <b...@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/xfs/xfs_da_btree.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/fs/xfs/xfs_da_btree.c
+++ b/fs/xfs/xfs_da_btree.c
@@ -1223,6 +1223,7 @@ xfs_da3_node_toosmall(
/* start with smaller blk num */
forward = nodehdr.forw < nodehdr.back;
for (i = 0; i < 2; forward = !forward, i++) {
+ struct xfs_da3_icnode_hdr thdr;
if (forward)
blkno = nodehdr.forw;
else
@@ -1235,10 +1236,10 @@ xfs_da3_node_toosmall(
return(error);
node = bp->b_addr;
- xfs_da3_node_hdr_from_disk(&nodehdr, node);
+ xfs_da3_node_hdr_from_disk(&thdr, node);
xfs_trans_brelse(state->args->trans, bp);
- if (count - nodehdr.count >= 0)
+ if (count - thdr.count >= 0)
break; /* fits with at least 25% to spare */
}
if (i >= 2) {
--
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