Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f1cad2b6 authored by Shaohua Li's avatar Shaohua Li Committed by NeilBrown
Browse files

md: linear supports TRIM 



This makes md linear support TRIM.

Signed-off-by: default avatarShaohua Li <shli@fusionio.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent bc78c573

drivers/md/linear.c

+16 −0
Original line number Diff line number Diff line
@@ -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);

}