diff options
author | Christoph Hellwig <hch@lst.de> | 2022-04-15 06:52:53 +0200 |
---|---|---|
committer | Jens Axboe <axboe@kernel.dk> | 2022-04-18 03:49:59 +0200 |
commit | e3cc28ea28b5f8794db2aed24f8a0282ad2e85a2 (patch) | |
tree | 725631a2f3bff8b70df2d269576529e5c37c91de | |
parent | block: move {bdev,queue_limit}_discard_alignment out of line (diff) | |
download | linux-e3cc28ea28b5f8794db2aed24f8a0282ad2e85a2.tar.xz linux-e3cc28ea28b5f8794db2aed24f8a0282ad2e85a2.zip |
block: refactor discard bio size limiting
Move all the logic to limit the discard bio size into a common helper
so that it is better documented.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Coly Li <colyli@suse.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-23-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r-- | block/blk-lib.c | 59 | ||||
-rw-r--r-- | block/blk.h | 14 |
2 files changed, 29 insertions, 44 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index 237d60d8b585..2ae32a722851 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -10,6 +10,32 @@ #include "blk.h" +static sector_t bio_discard_limit(struct block_device *bdev, sector_t sector) +{ + unsigned int discard_granularity = + bdev_get_queue(bdev)->limits.discard_granularity; + sector_t granularity_aligned_sector; + + if (bdev_is_partition(bdev)) + sector += bdev->bd_start_sect; + + granularity_aligned_sector = + round_up(sector, discard_granularity >> SECTOR_SHIFT); + + /* + * Make sure subsequent bios start aligned to the discard granularity if + * it needs to be split. + */ + if (granularity_aligned_sector != sector) + return granularity_aligned_sector - sector; + + /* + * Align the bio size to the discard granularity to make splitting the bio + * at discard granularity boundaries easier in the driver if needed. + */ + return round_down(UINT_MAX, discard_granularity) >> SECTOR_SHIFT; +} + int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, int flags, struct bio **biop) @@ -17,7 +43,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, struct request_queue *q = bdev_get_queue(bdev); struct bio *bio = *biop; unsigned int op; - sector_t bs_mask, part_offset = 0; + sector_t bs_mask; if (bdev_read_only(bdev)) return -EPERM; @@ -48,36 +74,9 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, if (!nr_sects) return -EINVAL; - /* In case the discard request is in a partition */ - if (bdev_is_partition(bdev)) - part_offset = bdev->bd_start_sect; - while (nr_sects) { - sector_t granularity_aligned_lba, req_sects; - sector_t sector_mapped = sector + part_offset; - - granularity_aligned_lba = round_up(sector_mapped, - q->limits.discard_granularity >> SECTOR_SHIFT); - - /* - * Check whether the discard bio starts at a discard_granularity - * aligned LBA, - * - If no: set (granularity_aligned_lba - sector_mapped) to - * bi_size of the first split bio, then the second bio will - * start at a discard_granularity aligned LBA on the device. - * - If yes: use bio_aligned_discard_max_sectors() as the max - * possible bi_size of the first split bio. Then when this bio - * is split in device drive, the split ones are very probably - * to be aligned to discard_granularity of the device's queue. - */ - if (granularity_aligned_lba == sector_mapped) - req_sects = min_t(sector_t, nr_sects, - bio_aligned_discard_max_sectors(q)); - else - req_sects = min_t(sector_t, nr_sects, - granularity_aligned_lba - sector_mapped); - - WARN_ON_ONCE((req_sects << 9) > UINT_MAX); + sector_t req_sects = + min(nr_sects, bio_discard_limit(bdev, sector)); bio = blk_next_bio(bio, bdev, 0, op, gfp_mask); bio->bi_iter.bi_sector = sector; diff --git a/block/blk.h b/block/blk.h index 4ea5167dc339..434017701403 100644 --- a/block/blk.h +++ b/block/blk.h @@ -347,20 +347,6 @@ static inline unsigned int bio_allowed_max_sectors(struct request_queue *q) } /* - * The max bio size which is aligned to q->limits.discard_granularity. This - * is a hint to split large discard bio in generic block layer, then if device - * driver needs to split the discard bio into smaller ones, their bi_size can - * be very probably and easily aligned to discard_granularity of the device's - * queue. - */ -static inline unsigned int bio_aligned_discard_max_sectors( - struct request_queue *q) -{ - return round_down(UINT_MAX, q->limits.discard_granularity) >> - SECTOR_SHIFT; -} - -/* * Internal io_context interface */ struct io_cq *ioc_find_get_icq(struct request_queue *q); |