From 9e5ac13acbb9e806a54f131432501bf462248c35 Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Mon, 14 Oct 2013 12:59:43 +0800 Subject: [PATCH] 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 --- fs/btrfs/delayed-ref.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c index 9bbac6ddf415..fab60c1ba065 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; -- GitLab