Commit 8689461b authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

block: factor out a chunk_size_left helper 



Factor out a helper from blk_max_size_offset so that it can be reused
independently.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarBart Van Assche <bvanassche@acm.org>
Reviewed-by: default avatarPankaj Raghav <p.raghav@samsung.com>
Link: https://lore.kernel.org/r/20220614090934.570632-2-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 51ab80f0

include/linux/blkdev.h

+13 −6
Original line number Diff line number Diff line
@@ -934,6 +934,17 @@ static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, 
	return q->limits.max_sectors;

}



/*

 * Return how much of the chunk is left to be used for I/O at a given offset.

 */

static inline unsigned int blk_chunk_sectors_left(sector_t offset,

		unsigned int chunk_sectors)

{

	if (unlikely(!is_power_of_2(chunk_sectors)))

		return chunk_sectors - sector_div(offset, chunk_sectors);

	return chunk_sectors - (offset & (chunk_sectors - 1));

}



/*

 * Return maximum size of a request at given offset. Only valid for

 * file system requests.
@@ -949,12 +960,8 @@ static inline unsigned int blk_max_size_offset(struct request_queue *q, 
			return q->limits.max_sectors;

	}



	if (likely(is_power_of_2(chunk_sectors)))

		chunk_sectors -= offset & (chunk_sectors - 1);

	else

		chunk_sectors -= sector_div(offset, chunk_sectors);



	return min(q->limits.max_sectors, chunk_sectors);

	return min(q->limits.max_sectors,

			blk_chunk_sectors_left(offset, chunk_sectors));

}



/*