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| author | Christoph Hellwig <hch@lst.de> | 2022-03-30 07:29:07 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-04-18 06:54:09 -0600 |
| commit | 9acf381f3e8f715175c29f4b6d722f6b6797d139 (patch) | |
| tree | 9f0a39c15820a6772d4cd0b60f458010b5ac6c64 /include/linux/blkdev.h | |
| parent | dbdc1be32591af023db2812706f01e6cd2f42bfc (diff) | |
| download | lwn-9acf381f3e8f715175c29f4b6d722f6b6797d139.tar.gz lwn-9acf381f3e8f715175c29f4b6d722f6b6797d139.zip | |
block: turn bdev->bd_openers into an atomic_t
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>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 436645bde13f..afad3d1d0dac 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -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); } /* |