Commit 1eadb157 authored by John Garry's avatar John Garry Committed by Jens Axboe
Browse files

block: Add bdev atomic write limits helpers 



Add helpers to get atomic write limits for a bdev, so that we don't access
request_queue helpers outside the block layer.

We check if the bdev can actually atomic write in these helpers, so we
can avoid users missing using this check.

Suggested-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDarrick J. Wong <djwong@kernel.org>
Signed-off-by: default avatarJohn Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20241019125113.369994-4-john.g.garry@oracle.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent c3be7ebb

include/linux/blkdev.h

+16 −0
Original line number Diff line number Diff line
@@ -1674,6 +1674,22 @@ static inline bool bdev_can_atomic_write(struct block_device *bdev) 
	return true;

}



static inline unsigned int

bdev_atomic_write_unit_min_bytes(struct block_device *bdev)

{

	if (!bdev_can_atomic_write(bdev))

		return 0;

	return queue_atomic_write_unit_min_bytes(bdev_get_queue(bdev));

}



static inline unsigned int

bdev_atomic_write_unit_max_bytes(struct block_device *bdev)

{

	if (!bdev_can_atomic_write(bdev))

		return 0;

	return queue_atomic_write_unit_max_bytes(bdev_get_queue(bdev));

}



#define DEFINE_IO_COMP_BATCH(name)	struct io_comp_batch name = { }



#endif /* _LINUX_BLKDEV_H */