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block: make sure discard bio is aligned with logical block size

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Obviously the created discard bio has to be aligned with logical block size.

This patch introduces the helper of bio_allowed_max_sectors() for
this purpose.

Cc: [email protected]
Cc: Mike Snitzer <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Xiao Ni <[email protected]>
Cc: Mariusz Dabrowski <[email protected]>
Fixes: 744889b7cb ("block: don't deal with discard limit in blkdev_issue_discard()")
Fixes: a22c4d7e34 ("block: re-add discard_granularity and alignment checks")
Reported-by: Rui Salvaterra <[email protected]>
Tested-by: Rui Salvaterra <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ming Lei 2018-10-29 20:57:17 +08:00 • committed by Jens Axboe
commit 1adfc5e413
3 changed files with 13 additions and 3 deletions
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10
block/blk.h
View file

@ -395,6 +395,16 @@ static inline unsigned long blk_rq_deadline(struct request *rq)
return rq->__deadline & ~0x1UL;
}
/*
* The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
* is defined as 'unsigned int', meantime it has to aligned to with logical
* block size which is the minimum accepted unit by hardware.
*/
static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
{
return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
}
/*
* Internal io_context interface
*/