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fs/writeback: bail out if there is no more inodes for IO and queued once

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[ Upstream commit d92109891f21cf367caa2cc6dff11a4411d917f4 ]

For case there is no more inodes for IO in io list from last wb_writeback,
We may bail out early even there is inode in dirty list should be written
back. Only bail out when we queued once to avoid missing dirtied inode.

This is from code reading...

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Link: https://lore.kernel.org/r/20240228091958.288260-3-shikemeng@huaweicloud.com
Reviewed-by: Jan Kara <jack@suse.cz>
[brauner@kernel.org: fold in memory corruption fix from Jan in [1]]
Link: https://lore.kernel.org/r/20240405132346.bid7gibby3lxxhez@quack3 [1]
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kemeng Shi 2024-02-28 17:19:54 +08:00 committed by Greg Kroah-Hartman
parent 5f2d0708ac
commit 0eeb28d7e1
1 changed files with 5 additions and 2 deletions
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7
fs/fs-writeback.c
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@ -2044,6 +2044,7 @@ static long wb_writeback(struct bdi_writeback *wb,
struct inode *inode;
long progress;
struct blk_plug plug;
bool queued = false;
blk_start_plug(&plug);
for (;;) {
@ -2086,8 +2087,10 @@ static long wb_writeback(struct bdi_writeback *wb,
dirtied_before = jiffies;
trace_writeback_start(wb, work);
if (list_empty(&wb->b_io))
if (list_empty(&wb->b_io)) {
queue_io(wb, work, dirtied_before);
queued = true;
}
if (work->sb)
progress = writeback_sb_inodes(work->sb, wb, work);
else
@ -2102,7 +2105,7 @@ static long wb_writeback(struct bdi_writeback *wb,
* mean the overall work is done. So we keep looping as long
* as made some progress on cleaning pages or inodes.
*/
if (progress) {
if (progress || !queued) {
spin_unlock(&wb->list_lock);
continue;
}