[PATCH 10/13] loop: only freeze the queue in __loop_clr_fd when needed

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



->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@xxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Tested-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 drivers/block/loop.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index c57acbcf9be6a..a5dd259958ee2 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1144,8 +1144,13 @@ 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);
@@ -1170,7 +1175,8 @@ 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);
 
-- 
2.30.2




[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux