diff options
| author | Bart Van Assche <bvanassche@acm.org> | 2022-10-25 12:17:54 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-10-25 13:41:17 -0600 |
| commit | aa261f20589d894eb08b9a2b11c9672c548387cd (patch) | |
| tree | c33eb759fbaa95a5db64e447ad77ec863f100f36 /block/blk-merge.c | |
| parent | b179c98f76978a0fae072c2b2dad8e143218afd8 (diff) | |
block: Constify most queue limits pointers
Document which functions do not modify the queue limits.
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Keith Busch <kbusch@kernel.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20221025191755.1711437-3-bvanassche@acm.org
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-merge.c')
| -rw-r--r-- | block/blk-merge.c | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index ff04e9290715..58fdc3f8905b 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -100,13 +100,14 @@ static inline bool req_gap_front_merge(struct request *req, struct bio *bio) * is defined as 'unsigned int', meantime it has to be aligned to with the * logical block size, which is the minimum accepted unit by hardware. */ -static unsigned int bio_allowed_max_sectors(struct queue_limits *lim) +static unsigned int bio_allowed_max_sectors(const struct queue_limits *lim) { return round_down(UINT_MAX, lim->logical_block_size) >> SECTOR_SHIFT; } -static struct bio *bio_split_discard(struct bio *bio, struct queue_limits *lim, - unsigned *nsegs, struct bio_set *bs) +static struct bio *bio_split_discard(struct bio *bio, + const struct queue_limits *lim, + unsigned *nsegs, struct bio_set *bs) { unsigned int max_discard_sectors, granularity; sector_t tmp; @@ -146,7 +147,8 @@ static struct bio *bio_split_discard(struct bio *bio, struct queue_limits *lim, } static struct bio *bio_split_write_zeroes(struct bio *bio, - struct queue_limits *lim, unsigned *nsegs, struct bio_set *bs) + const struct queue_limits *lim, + unsigned *nsegs, struct bio_set *bs) { *nsegs = 0; if (!lim->max_write_zeroes_sectors) @@ -165,7 +167,7 @@ static struct bio *bio_split_write_zeroes(struct bio *bio, * aligned to a physical block boundary. */ static inline unsigned get_max_io_size(struct bio *bio, - struct queue_limits *lim) + const struct queue_limits *lim) { unsigned pbs = lim->physical_block_size >> SECTOR_SHIFT; unsigned lbs = lim->logical_block_size >> SECTOR_SHIFT; @@ -184,7 +186,7 @@ static inline unsigned get_max_io_size(struct bio *bio, return max_sectors & ~(lbs - 1); } -static inline unsigned get_max_segment_size(struct queue_limits *lim, +static inline unsigned get_max_segment_size(const struct queue_limits *lim, struct page *start_page, unsigned long offset) { unsigned long mask = lim->seg_boundary_mask; @@ -219,9 +221,9 @@ static inline unsigned get_max_segment_size(struct queue_limits *lim, * *@nsegs segments and *@sectors sectors would make that bio unacceptable for * the block driver. */ -static bool bvec_split_segs(struct queue_limits *lim, const struct bio_vec *bv, - unsigned *nsegs, unsigned *bytes, unsigned max_segs, - unsigned max_bytes) +static bool bvec_split_segs(const struct queue_limits *lim, + const struct bio_vec *bv, unsigned *nsegs, unsigned *bytes, + unsigned max_segs, unsigned max_bytes) { unsigned max_len = min(max_bytes, UINT_MAX) - *bytes; unsigned len = min(bv->bv_len, max_len); @@ -267,7 +269,7 @@ static bool bvec_split_segs(struct queue_limits *lim, const struct bio_vec *bv, * responsible for ensuring that @bs is only destroyed after processing of the * split bio has finished. */ -static struct bio *bio_split_rw(struct bio *bio, struct queue_limits *lim, +static struct bio *bio_split_rw(struct bio *bio, const struct queue_limits *lim, unsigned *segs, struct bio_set *bs, unsigned max_bytes) { struct bio_vec bv, bvprv, *bvprvp = NULL; @@ -331,8 +333,9 @@ split: * The split bio is allocated from @q->bio_split, which is provided by the * block layer. */ -struct bio *__bio_split_to_limits(struct bio *bio, struct queue_limits *lim, - unsigned int *nr_segs) +struct bio *__bio_split_to_limits(struct bio *bio, + const struct queue_limits *lim, + unsigned int *nr_segs) { struct bio_set *bs = &bio->bi_bdev->bd_disk->bio_split; struct bio *split; @@ -377,7 +380,7 @@ struct bio *__bio_split_to_limits(struct bio *bio, struct queue_limits *lim, */ struct bio *bio_split_to_limits(struct bio *bio) { - struct queue_limits *lim = &bdev_get_queue(bio->bi_bdev)->limits; + const struct queue_limits *lim = &bdev_get_queue(bio->bi_bdev)->limits; unsigned int nr_segs; if (bio_may_exceed_limits(bio, lim)) |