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authorShaohua Li <shli@kernel.org>2012-10-11 13:30:52 +1100
committerNeilBrown <neilb@suse.de>2012-10-11 13:30:52 +1100
commit532a2a3fba8df076d65fdf17518eeb327b37a313 (patch)
treec23b22940ed37804baf535eb4f79f369851b1779 /drivers/md
parent2ff8cc2c6d4e323de71a42affeb3041fa17d5b10 (diff)
downloadop-kernel-dev-532a2a3fba8df076d65fdf17518eeb327b37a313.zip
op-kernel-dev-532a2a3fba8df076d65fdf17518eeb327b37a313.tar.gz
md: raid 10 supports TRIM
This makes md raid 10 support TRIM. If one disk supports discard and another not, or one has discard_zero_data and another not, there could be inconsistent between data from such disks. But this should not matter, discarded data is useless. This will add extra copy in rebuild though. Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/raid10.c29
1 files changed, 25 insertions, 4 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 1c2eb38..f92e0ed 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -911,7 +911,12 @@ static void flush_pending_writes(struct r10conf *conf)
while (bio) { /* submit pending writes */
struct bio *next = bio->bi_next;
bio->bi_next = NULL;
- generic_make_request(bio);
+ if (unlikely((bio->bi_rw & REQ_DISCARD) &&
+ !blk_queue_discard(bdev_get_queue(bio->bi_bdev))))
+ /* Just ignore it */
+ bio_endio(bio, 0);
+ else
+ generic_make_request(bio);
bio = next;
}
} else
@@ -1061,6 +1066,8 @@ static void make_request(struct mddev *mddev, struct bio * bio)
const int rw = bio_data_dir(bio);
const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
const unsigned long do_fua = (bio->bi_rw & REQ_FUA);
+ const unsigned long do_discard = (bio->bi_rw
+ & (REQ_DISCARD | REQ_SECURE));
unsigned long flags;
struct md_rdev *blocked_rdev;
int sectors_handled;
@@ -1081,7 +1088,7 @@ static void make_request(struct mddev *mddev, struct bio * bio)
|| conf->prev.near_copies < conf->prev.raid_disks))) {
struct bio_pair *bp;
/* Sanity check -- queue functions should prevent this happening */
- if (bio->bi_vcnt != 1 ||
+ if ((bio->bi_vcnt != 1 && bio->bi_vcnt != 0) ||
bio->bi_idx != 0)
goto bad_map;
/* This is a one page bio that upper layers
@@ -1410,7 +1417,7 @@ retry_write:
conf->mirrors[d].rdev));
mbio->bi_bdev = conf->mirrors[d].rdev->bdev;
mbio->bi_end_io = raid10_end_write_request;
- mbio->bi_rw = WRITE | do_sync | do_fua;
+ mbio->bi_rw = WRITE | do_sync | do_fua | do_discard;
mbio->bi_private = r10_bio;
atomic_inc(&r10_bio->remaining);
@@ -1439,7 +1446,7 @@ retry_write:
conf->mirrors[d].replacement));
mbio->bi_bdev = conf->mirrors[d].replacement->bdev;
mbio->bi_end_io = raid10_end_write_request;
- mbio->bi_rw = WRITE | do_sync | do_fua;
+ mbio->bi_rw = WRITE | do_sync | do_fua | do_discard;
mbio->bi_private = r10_bio;
atomic_inc(&r10_bio->remaining);
@@ -1723,6 +1730,9 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
clear_bit(Unmerged, &rdev->flags);
}
md_integrity_add_rdev(rdev, mddev);
+ if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
+ queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
+
print_conf(conf);
return err;
}
@@ -3480,6 +3490,7 @@ static int run(struct mddev *mddev)
sector_t size;
sector_t min_offset_diff = 0;
int first = 1;
+ bool discard_supported = false;
if (mddev->private == NULL) {
conf = setup_conf(mddev);
@@ -3496,6 +3507,8 @@ static int run(struct mddev *mddev)
chunk_size = mddev->chunk_sectors << 9;
if (mddev->queue) {
+ blk_queue_max_discard_sectors(mddev->queue,
+ mddev->chunk_sectors);
blk_queue_io_min(mddev->queue, chunk_size);
if (conf->geo.raid_disks % conf->geo.near_copies)
blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks);
@@ -3541,8 +3554,16 @@ static int run(struct mddev *mddev)
rdev->data_offset << 9);
disk->head_position = 0;
+
+ if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
+ discard_supported = true;
}
+ if (discard_supported)
+ queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
+ else
+ queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
+
/* need to check that every block has at least one working mirror */
if (!enough(conf, -1)) {
printk(KERN_ERR "md/raid10:%s: not enough operational mirrors.\n",
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