block: use bd_prepare_to_claim directly in the loop driver

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.

Christoph Hellwig committed 6 years ago

Commit ecbe6bc1 parent 58e46ed3 files · +10 −9Browse files

Showing the changes to include/linux/blkdev.h (1 of 3 files). Show all

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include/linux/blkdev.h+2−1

@@ -1919,7 +1919,8 @@ int blkdev_get(struct block_device bdev, fmode_t mode, void holder); · 1918 unmodified lines
1919	1919	struct block_device blkdev_get_by_path(const char path, fmode_t mode,
1920	1920	void *holder);
1921	1921	struct block_device blkdev_get_by_dev(dev_t dev, fmode_t mode, void holder);
1922		−struct block_device bd_start_claiming(struct block_device bdev, void *holder);
	1922	+int bd_prepare_to_claim(struct block_device bdev, struct block_device whole,
	1923	+ void *holder);
1923	1924	void bd_abort_claiming(struct block_device bdev, struct block_device whole,
1924	1925	void *holder);
1925	1926	void blkdev_put(struct block_device *bdev, fmode_t mode);