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Commit 9d1032cc authored by Wang Xiaoguang's avatar Wang Xiaoguang Committed by David Sterba
Browse files

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: default avatarWang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 9c894696

fs/btrfs/extent-tree.c

+3 −0
Original line number Diff line number Diff line
@@ -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",