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loop: only freeze the queue in __loop_clr_fd when needed

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->release is only called after all outstanding I/O has completed, so only
freeze the queue when clearing the backing file of a live loop device.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Tested-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20220330052917.2566582-11-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-03-30 07:29:12 +02:00 committed by Jens Axboe
parent 46dc967445
commit 1fe0b1acb1
1 changed files with 9 additions and 3 deletions
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12
drivers/block/loop.c
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@ -1139,8 +1139,13 @@ static void __loop_clr_fd(struct loop_device *lo, bool release)
if (test_bit(QUEUE_FLAG_WC, &lo->lo_queue->queue_flags))
blk_queue_write_cache(lo->lo_queue, false, false);
/* freeze request queue during the transition */
blk_mq_freeze_queue(lo->lo_queue);
/*
* Freeze the request queue when unbinding on a live file descriptor and
* thus an open device. When called from ->release we are guaranteed
* that there is no I/O in progress already.
*/
if (!release)
blk_mq_freeze_queue(lo->lo_queue);
destroy_workqueue(lo->workqueue);
loop_free_idle_workers(lo, true);
@ -1165,7 +1170,8 @@ static void __loop_clr_fd(struct loop_device *lo, bool release)
mapping_set_gfp_mask(filp->f_mapping, gfp);
/* This is safe: open() is still holding a reference. */
module_put(THIS_MODULE);
blk_mq_unfreeze_queue(lo->lo_queue);
if (!release)
blk_mq_unfreeze_queue(lo->lo_queue);
disk_force_media_change(lo->lo_disk, DISK_EVENT_MEDIA_CHANGE);