From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cn.fujitsu.com ([222.73.24.84]:60617 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752339Ab3LMKIb (ORCPT ); Fri, 13 Dec 2013 05:08:31 -0500 Received: from fnstmail02.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id rBDA8SPq008940 for ; Fri, 13 Dec 2013 18:08:28 +0800 From: Miao Xie To: linux-btrfs@vger.kernel.org Subject: [PATCH 3/6] Btrfs: cleanup code of btrfs_balance_delayed_items() Date: Fri, 13 Dec 2013 18:09:38 +0800 Message-Id: <1386929381-3483-3-git-send-email-miaox@cn.fujitsu.com> In-Reply-To: <1386929381-3483-1-git-send-email-miaox@cn.fujitsu.com> References: <1386929381-3483-1-git-send-email-miaox@cn.fujitsu.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: - move the condition check for wait into a function - use wait_event_interruptible instead of prepare-schedule-finish process Signed-off-by: Miao Xie --- fs/btrfs/delayed-inode.c | 34 +++++++++++----------------------- 1 file changed, 11 insertions(+), 23 deletions(-) diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c index bb101b0..5229106 100644 --- a/fs/btrfs/delayed-inode.c +++ b/fs/btrfs/delayed-inode.c @@ -1349,52 +1349,40 @@ void btrfs_assert_delayed_root_empty(struct btrfs_root *root) WARN_ON(btrfs_first_delayed_node(delayed_root)); } -static int refs_newer(struct btrfs_delayed_root *delayed_root, - int seq, int count) +static int could_end_wait(struct btrfs_delayed_root *delayed_root, int seq) { int val = atomic_read(&delayed_root->items_seq); - if (val < seq || val >= seq + count) + if (val < seq || val >= seq + BTRFS_DELAYED_BATCH) return 1; + + if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND) + return 1; + return 0; } void btrfs_balance_delayed_items(struct btrfs_root *root) { struct btrfs_delayed_root *delayed_root; - int seq; delayed_root = btrfs_get_delayed_root(root); if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND) return; - seq = atomic_read(&delayed_root->items_seq); - if (atomic_read(&delayed_root->items) >= BTRFS_DELAYED_WRITEBACK) { + int seq; int ret; - DEFINE_WAIT(__wait); + + seq = atomic_read(&delayed_root->items_seq); ret = btrfs_wq_run_delayed_node(delayed_root, root, 0); if (ret) return; - while (1) { - prepare_to_wait(&delayed_root->wait, &__wait, - TASK_INTERRUPTIBLE); - - if (refs_newer(delayed_root, seq, - BTRFS_DELAYED_BATCH) || - atomic_read(&delayed_root->items) < - BTRFS_DELAYED_BACKGROUND) { - break; - } - if (!signal_pending(current)) - schedule(); - else - break; - } - finish_wait(&delayed_root->wait, &__wait); + wait_event_interruptible(delayed_root->wait, + could_end_wait(delayed_root, seq)); return; } -- 1.8.3.1