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| author | Jens Axboe <jaxboe@fusionio.com> | 2010-07-15 20:49:31 +0400 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-08-07 20:26:33 +0400 |
| commit | 10d1f9e2ccfff40665a00ea0e0a0d11e54c9cbb1 (patch) | |
| tree | 222c661376d8530a1bdf4e18cf5ff84267529bb3 /block | |
| parent | f10d9f617a65905c556c3b37c9b9646ae7d04ed7 (diff) | |
| download | linux-10d1f9e2ccfff40665a00ea0e0a0d11e54c9cbb1.tar.xz | |
block: fix problem with sending down discard that isn't of correct granularity
If the queue doesn't have a limit set, or it just set UINT_MAX like
we default to, we coud be sending down a discard request that isn't
of the correct granularity if the block size is > 512b.
Fix this by adjusting max_discard_sectors down to the proper
alignment.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-lib.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index e16185b0d8e1..5d793e143f3c 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -41,6 +41,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, struct request_queue *q = bdev_get_queue(bdev); int type = flags & BLKDEV_IFL_BARRIER ? DISCARD_BARRIER : DISCARD_NOBARRIER; + unsigned int max_discard_sectors; struct bio *bio; int ret = 0; @@ -50,10 +51,18 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, if (!blk_queue_discard(q)) return -EOPNOTSUPP; - while (nr_sects && !ret) { - unsigned int max_discard_sectors = - min(q->limits.max_discard_sectors, UINT_MAX >> 9); + /* + * Ensure that max_discard_sectors is of the proper + * granularity + */ + max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9); + if (q->limits.discard_granularity) { + unsigned int disc_sects = q->limits.discard_granularity >> 9; + max_discard_sectors &= ~(disc_sects - 1); + } + + while (nr_sects && !ret) { bio = bio_alloc(gfp_mask, 1); if (!bio) { ret = -ENOMEM; |