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| author | Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com> | 2016-06-20 09:18:52 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2016-10-24 18:20:29 +0200 |
| commit | 9d1032cc49a8a1065e79ee323de66bcb4fdbd535 (patch) | |
| tree | 949523d20856471ba5d48aaca9cf26c70638b59a /fs | |
| parent | 9c894696f56f5d84fb5766af81bcda4a7cb9a842 (diff) | |
| download | linux-9d1032cc49a8a1065e79ee323de66bcb4fdbd535.tar.bz2 | |
btrfs: fix WARNING in btrfs_select_ref_head()
This issue was found when testing in-band dedupe enospc behaviour,
sometimes run_one_delayed_ref() may fail for enospc reason, then
__btrfs_run_delayed_refs（）will return, but forget to add num_heads_read
back, which will trigger "WARN_ON(delayed_refs->num_heads_ready == 0)" in
btrfs_select_ref_head().
Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 210c94ac8818..4607af38c72e 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -2647,7 +2647,10 @@ static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, btrfs_free_delayed_extent_op(extent_op); if (ret) { + spin_lock(&delayed_refs->lock); locked_ref->processing = 0; + delayed_refs->num_heads_ready++; + spin_unlock(&delayed_refs->lock); btrfs_delayed_ref_unlock(locked_ref); btrfs_put_delayed_ref(ref); btrfs_debug(fs_info, "run_one_delayed_ref returned %d", |