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: [PATCH 08/15] loop: remove the racy bd_inode->i_mapping->nrpages asserts
Date: Wed, 30 Mar 2022 07:29:10 +0200 [thread overview]
Message-ID: <20220330052917.2566582-9-hch@lst.de> (raw)
In-Reply-To: <20220330052917.2566582-1-hch@lst.de>
Nothing prevents a file system or userspace opener of the block device
from redirtying the page right afte sync_blockdev returned. Fortunately
data in the page cache during a block device change is mostly harmless
anyway.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Tested-by: Darrick J. Wong <djwong@kernel.org>
---
drivers/block/loop.c | 20 --------------------
1 file changed, 20 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index d1c1086beedce..25a71fd7b59da 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1276,15 +1276,6 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
/* I/O need to be drained during transfer transition */
blk_mq_freeze_queue(lo->lo_queue);
- if (size_changed && lo->lo_device->bd_inode->i_mapping->nrpages) {
- /* If any pages were dirtied after invalidate_bdev(), try again */
- err = -EAGAIN;
- pr_warn("%s: loop%d (%s) still has dirty pages (nrpages=%lu)\n",
- __func__, lo->lo_number, lo->lo_file_name,
- lo->lo_device->bd_inode->i_mapping->nrpages);
- goto out_unfreeze;
- }
-
prev_lo_flags = lo->lo_flags;
err = loop_set_status_from_info(lo, info);
@@ -1495,21 +1486,10 @@ static int loop_set_block_size(struct loop_device *lo, unsigned long arg)
invalidate_bdev(lo->lo_device);
blk_mq_freeze_queue(lo->lo_queue);
-
- /* invalidate_bdev should have truncated all the pages */
- if (lo->lo_device->bd_inode->i_mapping->nrpages) {
- err = -EAGAIN;
- pr_warn("%s: loop%d (%s) still has dirty pages (nrpages=%lu)\n",
- __func__, lo->lo_number, lo->lo_file_name,
- lo->lo_device->bd_inode->i_mapping->nrpages);
- goto out_unfreeze;
- }
-
blk_queue_logical_block_size(lo->lo_queue, arg);
blk_queue_physical_block_size(lo->lo_queue, arg);
blk_queue_io_min(lo->lo_queue, arg);
loop_update_dio(lo);
-out_unfreeze:
blk_mq_unfreeze_queue(lo->lo_queue);
return err;
--
2.30.2
next prev parent reply other threads:[~2022-03-30 5:30 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-30 5:29 yet another approach to fix the loop lock order inversions v6 Christoph Hellwig
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 ` Christoph Hellwig [this message]
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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