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genhd: Add helper put_disk_and_module()

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Add a proper counterpart to get_disk_and_module() -
put_disk_and_module(). Currently it is opencoded in several places.

Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jan Kara 2018-02-26 13:01:39 +01:00 • committed by Jens Axboe
commit 9df6c29912
4 changed files with 24 additions and 27 deletions
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19
fs/block_dev.c
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@ -1111,8 +1111,7 @@ static struct block_device *bd_start_claiming(struct block_device *bdev,
else
whole = bdgrab(bdev);
module_put(disk->fops->owner);
put_disk(disk);
put_disk_and_module(disk);
if (!whole)
return ERR_PTR(-ENOMEM);
@ -1407,7 +1406,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
{
struct gendisk *disk;
struct module *owner;
int ret;
int partno;
int perm = 0;
@ -1433,7 +1431,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
disk = get_gendisk(bdev->bd_dev, &partno);
if (!disk)
goto out;
owner = disk->fops->owner;
disk_block_events(disk);
mutex_lock_nested(&bdev->bd_mutex, for_part);
@ -1463,8 +1460,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdev->bd_queue = NULL;
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
goto restart;
}
}
@ -1525,8 +1521,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
goto out_unlock_bdev;
}
/* only one opener holds refs to the module and disk */
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
}
bdev->bd_openers++;
if (for_part)
@ -1546,8 +1541,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
out_unlock_bdev:
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
out:
bdput(bdev);
@ -1770,8 +1764,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
disk->fops->release(disk, mode);
}
if (!bdev->bd_openers) {
struct module *owner = disk->fops->owner;
disk_put_part(bdev->bd_part);
bdev->bd_part = NULL;
bdev->bd_disk = NULL;
@ -1779,8 +1771,7 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
victim = bdev->bd_contains;
bdev->bd_contains = NULL;
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
}
mutex_unlock(&bdev->bd_mutex);
bdput(bdev);