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block: use bd_prepare_to_claim directly in the loop driver

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The arcane magic in bd_start_claiming is only needed to be able to claim
a block_device that hasn't been fully set up.  Switch the loop driver
that claims from the ioctl path with a fully set up struct block_device
to just use the much simpler bd_prepare_to_claim directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2020-07-16 16:33:09 +02:00
committed by Jens Axboe
parent 58e46ed9cc
commit ecbe6bc000
3 changed files with 10 additions and 9 deletions
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3
include/linux/blkdev.h
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@@ -1919,7 +1919,8 @@ int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
void *holder);
struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
struct block_device *bd_start_claiming(struct block_device *bdev, void *holder);
int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole,
void *holder);
void bd_abort_claiming(struct block_device *bdev, struct block_device *whole,
void *holder);
void blkdev_put(struct block_device *bdev, fmode_t mode);