GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-12 09:32:44 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

blk-mq: support concurrent queue quiesce/unquiesce

Browse source 
blk_mq_quiesce_queue() has been used a bit wide now, so far we don't support
concurrent/nested quiesce. One biggest issue is that unquiesce can happen
unexpectedly in case that quiesce/unquiesce are run concurrently from
more than one context.

This patch introduces q->mq_quiesce_depth to deal concurrent quiesce,
and we only unquiesce queue when it is the last/outer-most one of all
contexts.

Several kernel panic issue has been reported[1][2][3] when running stress
quiesce test. And this patch has been verified in these reports.

[1] https://lore.kernel.org/linux-block/9b21c797-e505-3821-4f5b-df7bf9380328@huawei.com/T/#m1fc52431fad7f33b1ffc3f12c4450e4238540787
[2] https://lore.kernel.org/linux-block/9b21c797-e505-3821-4f5b-df7bf9380328@huawei.com/T/#m10ad90afeb9c8cc318334190a7c24c8b5c5e0722
[3] https://listman.redhat.com/archives/dm-devel/2021-September/msg00189.html

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211014081710.1871747-7-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2021-10-14 16:17:10 +08:00 • committed by Jens Axboe
parent 1d35d519d8
commit e70feb8b3e
2 changed files with 21 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/blkdev.h
View file

@ -315,6 +315,8 @@ struct request_queue {
*/
struct mutex mq_freeze_lock;
int quiesce_depth;
struct blk_mq_tag_set *tag_set;
struct list_head tag_set_list;
struct bio_set bio_split;