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authorWang Xiaoguang <wangxg.fnst@cn.fujitsu.com>2016-06-20 03:18:52 +0200
committerDavid Sterba <dsterba@suse.com>2016-10-24 18:20:29 +0200
commit9d1032cc49a8a1065e79ee323de66bcb4fdbd535 (patch)
tree949523d20856471ba5d48aaca9cf26c70638b59a /fs
parentBtrfs: remove some no-op casts (diff)
downloadlinux-9d1032cc49a8a1065e79ee323de66bcb4fdbd535.tar.xz
linux-9d1032cc49a8a1065e79ee323de66bcb4fdbd535.zip
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.c3
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",