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block: discard granularity might not be power of 2

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In MD raid case, discard granularity might not be power of 2, for example, a
4-disk raid5 has 3*chunk_size discard granularity. Correct the calculation for
such cases.

Reported-by: Neil Brown <neilb@suse.de>
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Shaohua Li
2012-12-14 11:15:36 +08:00
committed by Jens Axboe
parent 75274551c8
commit 8dd2cb7e88
3 changed files with 20 additions and 16 deletions
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7
include/linux/blkdev.h
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@@ -1188,13 +1188,14 @@ static inline int queue_discard_alignment(struct request_queue *q)
static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
{
unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1);
sector_t alignment = sector << 9;
alignment = sector_div(alignment, lim->discard_granularity);
if (!lim->max_discard_sectors)
return 0;
return (lim->discard_granularity + lim->discard_alignment - alignment)
& (lim->discard_granularity - 1);
alignment = lim->discard_granularity + lim->discard_alignment - alignment;
return sector_div(alignment, lim->discard_granularity);
}
static inline int bdev_discard_alignment(struct block_device *bdev)