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Btrfs: fix an oops when we fail to relocate tree blocks

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During balance test, we hit an oops:
[ 2013.841551] kernel BUG at fs/btrfs/relocation.c:1174!

The problem is that if we fail to relocate tree blocks, we should
update backref cache, otherwise, some pending nodes are not updated
while snapshot check @cache->last_trans is within one transaction
and won't update it and then oops happen.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Wang Shilong 2013-12-28 19:52:39 +08:00 committed by Chris Mason
parent e77751aad1
commit 1708cc5723
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/relocation.c
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@ -4009,6 +4009,12 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
if (!RB_EMPTY_ROOT(&blocks)) {
ret = relocate_tree_blocks(trans, rc, &blocks);
if (ret < 0) {
/*
* if we fail to relocate tree blocks, force to update
* backref cache when committing transaction.
*/
rc->backref_cache.last_trans = trans->transid - 1;
if (ret != -EAGAIN) {
err = ret;
break;