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block: turn bdev->bd_openers into an atomic_t

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All manipulation of bd_openers is under disk->open_mutex and will remain
so for the foreseeable future.  But at least one place reads it without
the lock (blkdev_get) and there are more to be added.  So make sure the
compiler does not do turn the increments and decrements into non-atomic
sequences by using an atomic_t.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220330052917.2566582-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2022-03-30 07:29:07 +02:00
committed by Jens Axboe
parent dbdc1be325
commit 9acf381f3e
4 changed files with 11 additions and 11 deletions
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2
block/partitions/core.c
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@@ -478,7 +478,7 @@ int bdev_del_partition(struct gendisk *disk, int partno)
goto out_unlock;
ret = -EBUSY;
if (part->bd_openers)
if (atomic_read(&part->bd_openers))
goto out_unlock;
delete_partition(part);