Commit 9e5ac13a authored Oct 14, 2013 by Liu Bo Committed by Chris Mason Jan 28, 2014

Btrfs: skip merge part for delayed data refs



When we have data deduplication on, we'll hang on the merge part
because it needs to verify every queued delayed data refs related to
this disk offset but we may have millions refs.

And in the case of delayed data refs, we don't usually have too much
data refs to merge.

So it's safe to shut it down for data refs.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <clm@fb.com>

parent c46effa6

fs/btrfs/delayed-ref.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -352,6 +352,13 @@ void btrfs_merge_delayed_refs(struct btrfs_trans_handle *trans,
		struct rb_node *node;
		u64 seq = 0;

		/*
		* We don't have too much refs to merge in the case of delayed data
		* refs.
		*/
		if (head->is_data)
		return;

		spin_lock(&fs_info->tree_mod_seq_lock);
		if (!list_empty(&fs_info->tree_mod_seq_list)) {
		struct seq_list *elem;