From: Liu Bo Date: Mon, 14 Oct 2013 04:59:43 +0000 (+0800) Subject: Btrfs: skip merge part for delayed data refs X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9e5ac13acbb9e806a54f131432501bf462248c35;p=linux.git 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 Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c index 9bbac6ddf415c..fab60c1ba0650 100644 --- a/fs/btrfs/delayed-ref.c +++ b/fs/btrfs/delayed-ref.c @@ -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;