diff options
| author | Shaohua Li <shli@fusionio.com> | 2012-10-11 04:08:44 +0200 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-10-11 04:08:44 +0200 |
| commit | f1cad2b68ed12c0f82d3f56e150691f62b6f5edf (patch) | |
| tree | 4c0cd9e8f502576db6a87dec86d24fccf5b3b2e4 /drivers/md/linear.c | |
| parent | md/linear: rcu_dereference outside read-lock section (diff) | |
| download | linux-f1cad2b68ed12c0f82d3f56e150691f62b6f5edf.tar.xz linux-f1cad2b68ed12c0f82d3f56e150691f62b6f5edf.zip | |
md: linear supports TRIM
This makes md linear support TRIM.
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to '')
| -rw-r--r-- | drivers/md/linear.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/md/linear.c b/drivers/md/linear.c index 92c64d162a92..21014836bdbf 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -138,6 +138,7 @@ static struct linear_conf *linear_conf(struct mddev *mddev, int raid_disks) struct linear_conf *conf; struct md_rdev *rdev; int i, cnt; + bool discard_supported = false; conf = kzalloc (sizeof (*conf) + raid_disks*sizeof(struct dev_info), GFP_KERNEL); @@ -171,6 +172,8 @@ static struct linear_conf *linear_conf(struct mddev *mddev, int raid_disks) conf->array_sectors += rdev->sectors; cnt++; + if (blk_queue_discard(bdev_get_queue(rdev->bdev))) + discard_supported = true; } if (cnt != raid_disks) { printk(KERN_ERR "md/linear:%s: not enough drives present. Aborting!\n", @@ -178,6 +181,11 @@ static struct linear_conf *linear_conf(struct mddev *mddev, int raid_disks) goto out; } + if (!discard_supported) + queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); + else + queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); + /* * Here we calculate the device offsets. */ @@ -331,6 +339,14 @@ static void linear_make_request(struct mddev *mddev, struct bio *bio) bio->bi_sector = bio->bi_sector - start_sector + tmp_dev->rdev->data_offset; rcu_read_unlock(); + + if (unlikely((bio->bi_rw & REQ_DISCARD) && + !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) { + /* Just ignore it */ + bio_endio(bio, 0); + return; + } + generic_make_request(bio); } |