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From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>, Josef Bacik <josef@toxicpanda.com>,
	Minchan Kim <minchan@kernel.org>, Nitin Gupta <ngupta@vflare.org>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
	Jan Kara <jack@suse.cz>, "Darrick J . Wong" <djwong@kernel.org>,
	Ming Lei <ming.lei@redhat.com>,
	Matteo Croce <mcroce@microsoft.com>,
	linux-block@vger.kernel.org, nbd@other.debian.org
Subject: yet another approach to fix the loop lock order inversions v6
Date: Wed, 30 Mar 2022 07:29:02 +0200	[thread overview]
Message-ID: <20220330052917.2566582-1-hch@lst.de> (raw)

Hi all,

this series uses the approach from Tetsuo to delay the destroy_workueue
call, extended by a delayed teardown of the workers to fix a potential
race window then the workqueue can be still round after finishing the
commands. 

Changes since v5:
 - add a patch from Tesuo to move the global lock from __loop_clr_fd
   to loop_clr_fd

Changes since v4:
 - keep the (questionable) __invalidate_device call in nbd as-is for now
 - suppress uevents while reconfiguring

Changes since v3:
 - change bd_openers into a atomic_t, including a bunch of cleanups
   and fix found while adding those

Changes since v2:
 - rebased to the lastest block for-next tree, which has the async
   clear reverted and ->free_disk
 - impkement ->free_disk for loop to handle open vs delete races
   more gracefully
 - get rid of lo_refcnt entirely

Changes since v1:
 - add comments to document the lo_refcnt synchronization
 - fix comment typos

             reply	other threads:[~2022-03-30  5:29 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-30  5:29 Christoph Hellwig [this message]
2022-03-30  5:29 ` [PATCH 01/15] nbd: use the correct block_device in nbd_bdev_reset Christoph Hellwig
2022-04-18 12:54   ` Jens Axboe
2022-03-30  5:29 ` [PATCH 02/15] zram: cleanup reset_store Christoph Hellwig
2022-03-30  5:29 ` [PATCH 03/15] zram: cleanup zram_remove Christoph Hellwig
2022-03-30  5:29 ` [PATCH 04/15] block: add a disk_openers helper Christoph Hellwig
2022-03-30  5:29 ` [PATCH 05/15] block: turn bdev->bd_openers into an atomic_t Christoph Hellwig
2022-03-30  5:29 ` [PATCH 06/15] loop: de-duplicate the idle worker freeing code Christoph Hellwig
2022-03-30  5:29 ` [PATCH 07/15] loop: initialize the worker tracking fields once Christoph Hellwig
2022-03-30  5:29 ` [PATCH 08/15] loop: remove the racy bd_inode->i_mapping->nrpages asserts Christoph Hellwig
2022-03-30  5:29 ` [PATCH 09/15] loop: don't freeze the queue in lo_release Christoph Hellwig
2022-03-30  5:29 ` [PATCH 10/15] loop: only freeze the queue in __loop_clr_fd when needed Christoph Hellwig
2022-03-30  5:29 ` [PATCH 11/15] loop: implement ->free_disk Christoph Hellwig
2022-03-30  5:29 ` [PATCH 12/15] loop: suppress uevents while reconfiguring the device Christoph Hellwig
2022-03-30  5:29 ` [PATCH 13/15] loop: avoid loop_validate_mutex/lo_mutex in ->release Christoph Hellwig
2022-03-30  5:29 ` [PATCH 14/15] loop: remove lo_refcount and avoid lo_mutex in ->open / ->release Christoph Hellwig
2022-03-30  5:29 ` [PATCH 15/15] loop: don't destroy lo->workqueue in __loop_clr_fd Christoph Hellwig
2022-04-04  7:42 ` yet another approach to fix the loop lock order inversions v6 Christoph Hellwig
2022-04-04  9:39   ` Tetsuo Handa
2022-04-05  6:28     ` Christoph Hellwig
2022-04-05  6:38       ` Tetsuo Handa
2022-04-05  9:10       ` Jan Kara
2022-04-18  9:39     ` Tetsuo Handa

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