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| author | Mark Tinguely <tinguely@sgi.com> | 2013-09-23 12:18:58 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-13 18:14:31 -0700 |
| commit | d9645bbc32d900eca739e1aa8d2762e330e7a93c (patch) | |
| tree | 6b4cd14293ad670000e2d0706b11bca7759dca94 | |
| parent | 311a38441f3b71bf993f6b18d56cbfa43007d48c (diff) | |
| download | lwn-d9645bbc32d900eca739e1aa8d2762e330e7a93c.tar.gz lwn-d9645bbc32d900eca739e1aa8d2762e330e7a93c.zip | |
xfs: fix node forward in xfs_node_toosmall
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 <tinguely@sgi.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/xfs/xfs_da_btree.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/xfs/xfs_da_btree.c b/fs/xfs/xfs_da_btree.c index 0b8b2a13cd24..eca6f9d8a263 100644 --- 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) { |