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block: Generalize chunk_sectors support as boundary support

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The purpose of the chunk_sectors limit is to ensure that a mergeble request
fits within the boundary of the chunck_sector value.

Such a feature will be useful for other request_queue boundary limits, so
generalize the chunk_sectors merge code.

This idea was proposed by Hannes Reinecke.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20240620125359.2684798-3-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
John Garry
2024-06-20 12:53:51 +00:00
committed by Jens Axboe
parent 8d1dfd51c8
commit f70167a7a6
3 changed files with 22 additions and 13 deletions
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13
include/linux/blkdev.h
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@@ -907,14 +907,15 @@ static inline bool bio_straddles_zones(struct bio *bio)
}
/*
* Return how much of the chunk is left to be used for I/O at a given offset.
* Return how much within the boundary 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)
static inline unsigned int blk_boundary_sectors_left(sector_t offset,
unsigned int boundary_sectors)
{
if (unlikely(!is_power_of_2(chunk_sectors)))
return chunk_sectors - sector_div(offset, chunk_sectors);
return chunk_sectors - (offset & (chunk_sectors - 1));
if (unlikely(!is_power_of_2(boundary_sectors)))
return boundary_sectors - sector_div(offset, boundary_sectors);
return boundary_sectors - (offset & (boundary_sectors - 1));
}
/**