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fs/writeback: only calculate dirtied_before when b_io is empty

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The dirtied_before is only used when b_io is not empty, so only calculate
when b_io is not empty.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Link: https://lore.kernel.org/r/20240228091958.288260-5-shikemeng@huaweicloud.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Kemeng Shi 2024-02-28 17:19:56 +08:00 committed by Christian Brauner
parent 2ddc934612
commit 639924abc1
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GPG key ID: 91C61BC06578DCA2
1 changed files with 13 additions and 12 deletions
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25
fs/fs-writeback.c
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@ -2105,20 +2105,21 @@ static long wb_writeback(struct bdi_writeback *wb,
spin_lock(&wb->list_lock);
/*
* Kupdate and background works are special and we want to
* include all inodes that need writing. Livelock avoidance is
* handled by these works yielding to any other work so we are
* safe.
*/
if (work->for_kupdate) {
dirtied_before = jiffies -
msecs_to_jiffies(dirty_expire_interval * 10);
} else if (work->for_background)
dirtied_before = jiffies;
trace_writeback_start(wb, work);
if (list_empty(&wb->b_io)) {
/*
* Kupdate and background works are special and we want
* to include all inodes that need writing. Livelock
* avoidance is handled by these works yielding to any
* other work so we are safe.
*/
if (work->for_kupdate) {
dirtied_before = jiffies -
msecs_to_jiffies(dirty_expire_interval *
10);
} else if (work->for_background)
dirtied_before = jiffies;
queue_io(wb, work, dirtied_before);
queued = true;
}