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block: remove i_bdev

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Switch the block device lookup interfaces to directly work with a dev_t
so that struct block_device references are only acquired by the
blkdev_get variants (and the blk-cgroup special case).  This means that
we now don't need an extra reference in the inode and can generally
simplify handling of struct block_device to keep the lookups contained
in the core block layer code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Coly Li <colyli@suse.de>		[bcache]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-11-23 13:38:40 +01:00 • committed by Jens Axboe
parent 7918f0f6fd
commit 4e7b5671c6
18 changed files with 121 additions and 252 deletions
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2
include/linux/blkdev.h
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@ -1973,7 +1973,7 @@ int bdev_read_only(struct block_device *bdev);
int set_blocksize(struct block_device *bdev, int size);
const char *bdevname(struct block_device *bdev, char *buffer);
struct block_device *lookup_bdev(const char *);
int lookup_bdev(const char *pathname, dev_t *dev);
void blkdev_show(struct seq_file *seqf, off_t offset);