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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
include/linux/blkdev.h
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@ -188,7 +188,7 @@ static inline bool disk_live(struct gendisk *disk)
*/
static inline unsigned int disk_openers(struct gendisk *disk)
{
return disk->part0->bd_openers;
return atomic_read(&disk->part0->bd_openers);
}
/*