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| author | Christoph Hellwig <hch@lst.de> | 2022-06-14 11:09:29 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-06-27 06:29:11 -0600 |
| commit | 8689461be3f1ce6686bc26f1f379790bb0fc7a8c (patch) | |
| tree | c06cf2c3c78014e04481bbc84a72418a0ef41826 /include/linux/blkdev.h | |
| parent | 51ab80f0aa861335eb80327af53e444a27e824b8 (diff) | |
| download | lwn-8689461be3f1ce6686bc26f1f379790bb0fc7a8c.tar.gz lwn-8689461be3f1ce6686bc26f1f379790bb0fc7a8c.zip | |
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: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Pankaj Raghav <p.raghav@samsung.com>
Link: https://lore.kernel.org/r/20220614090934.570632-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 886c44e97434..283961257cc9 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -935,6 +935,17 @@ static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, } /* + * 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)); } /* |