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| author |   Martin K. Petersen <martin.petersen@oracle.com> | 2009-11-10 11:50:21 +0100 |
|---|---|---|
| committer |   Jens Axboe <jens.axboe@oracle.com> | 2009-11-10 11:50:21 +0100 |
| commit | 86b37281411cf1e9bc0a6b5406c45edb7bd9ea5d (patch) | |
| tree | 729db57dd52054af1bc16b4afb131093dfc9d255 /include | |
| parent | cfq-iosched: fix next_rq computation (diff) | |
| download | linux-dev-86b37281411cf1e9bc0a6b5406c45edb7bd9ea5d.tar.xz linux-dev-86b37281411cf1e9bc0a6b5406c45edb7bd9ea5d.zip | |
block: Expose discard granularity
While SSDs track block usage on a per-sector basis, RAID arrays often
have allocation blocks that are bigger. Allow the discard granularity
and alignment to be set and teach the topology stacking logic how to
handle them.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/blkdev.h | 18 | ||||
| -rw-r--r-- | include/linux/genhd.h | 1 |
2 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 39c601f783a0..1cc02972fbe2 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -312,12 +312,15 @@ struct queue_limits { unsigned int io_min; unsigned int io_opt; unsigned int max_discard_sectors; + unsigned int discard_granularity; + unsigned int discard_alignment; unsigned short logical_block_size; unsigned short max_hw_segments; unsigned short max_phys_segments; unsigned char misaligned; + unsigned char discard_misaligned; unsigned char no_cluster; }; @@ -1121,6 +1124,21 @@ static inline int bdev_alignment_offset(struct block_device *bdev) return q->limits.alignment_offset; } +static inline int queue_discard_alignment(struct request_queue *q) +{ + if (q->limits.discard_misaligned) + return -1; + + return q->limits.discard_alignment; +} + +static inline int queue_sector_discard_alignment(struct request_queue *q, + sector_t sector) +{ + return ((sector << 9) - q->limits.discard_alignment) + & (q->limits.discard_granularity - 1); +} + static inline int queue_dma_alignment(struct request_queue *q) { return q ? q->dma_alignment : 511; diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 297df45ffd0a..c6c0c41af35f 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -91,6 +91,7 @@ struct hd_struct { sector_t start_sect; sector_t nr_sects; sector_t alignment_offset; + unsigned int discard_alignment; struct device __dev; struct kobject *holder_dir; int policy, partno; |