This makes md linear support TRIM. Signed-off-by: Shaohua Li --- drivers/md/linear.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) Index: linux/drivers/md/linear.c =================================================================== --- linux.orig/drivers/md/linear.c 2012-03-14 09:16:37.380435112 +0800 +++ linux/drivers/md/linear.c 2012-03-14 09:23:55.907261497 +0800 @@ -129,6 +129,7 @@ static struct linear_conf *linear_conf(s 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(s 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(s 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. */ @@ -319,6 +327,14 @@ static void linear_make_request(struct m 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); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/