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authorKent Overstreet <kent.overstreet@gmail.com>2015-04-27 23:48:34 -0700
committerJens Axboe <axboe@fb.com>2015-08-13 12:31:57 -0600
commit8ae126660fddbeebb9251a174e6fa45b6ad8f932 (patch)
treefe471f94c8686b59f7a07b5b4f59ee4f51254902 /drivers/md/raid1.c
parent7140aafce2fc14c5af02fdb7859b6bea0108be3d (diff)
block: kill merge_bvec_fn() completely
As generic_make_request() is now able to handle arbitrarily sized bios, it's no longer necessary for each individual block driver to define its own ->merge_bvec_fn() callback. Remove every invocation completely. Cc: Jens Axboe <axboe@kernel.dk> Cc: Lars Ellenberg <drbd-dev@lists.linbit.com> Cc: drbd-user@lists.linbit.com Cc: Jiri Kosina <jkosina@suse.cz> Cc: Yehuda Sadeh <yehuda@inktank.com> Cc: Sage Weil <sage@inktank.com> Cc: Alex Elder <elder@kernel.org> Cc: ceph-devel@vger.kernel.org Cc: Alasdair Kergon <agk@redhat.com> Cc: Mike Snitzer <snitzer@redhat.com> Cc: dm-devel@redhat.com Cc: Neil Brown <neilb@suse.de> Cc: linux-raid@vger.kernel.org Cc: Christoph Hellwig <hch@infradead.org> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Acked-by: NeilBrown <neilb@suse.de> (for the 'md' bits) Acked-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> [dpark: also remove ->merge_bvec_fn() in dm-thin as well as dm-era-target, and resolve merge conflicts] Signed-off-by: Dongsu Park <dpark@posteo.net> Signed-off-by: Ming Lin <ming.l@ssi.samsung.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/md/raid1.c')
-rw-r--r--drivers/md/raid1.c58
1 files changed, 1 insertions, 57 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 60d0a8626e63..0ff06fdb83a9 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -557,7 +557,6 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
rdev = rcu_dereference(conf->mirrors[disk].rdev);
if (r1_bio->bios[disk] == IO_BLOCKED
|| rdev == NULL
- || test_bit(Unmerged, &rdev->flags)
|| test_bit(Faulty, &rdev->flags))
continue;
if (!test_bit(In_sync, &rdev->flags) &&
@@ -708,38 +707,6 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
return best_disk;
}
-static int raid1_mergeable_bvec(struct mddev *mddev,
- struct bvec_merge_data *bvm,
- struct bio_vec *biovec)
-{
- struct r1conf *conf = mddev->private;
- sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
- int max = biovec->bv_len;
-
- if (mddev->merge_check_needed) {
- int disk;
- rcu_read_lock();
- for (disk = 0; disk < conf->raid_disks * 2; disk++) {
- struct md_rdev *rdev = rcu_dereference(
- conf->mirrors[disk].rdev);
- if (rdev && !test_bit(Faulty, &rdev->flags)) {
- struct request_queue *q =
- bdev_get_queue(rdev->bdev);
- if (q->merge_bvec_fn) {
- bvm->bi_sector = sector +
- rdev->data_offset;
- bvm->bi_bdev = rdev->bdev;
- max = min(max, q->merge_bvec_fn(
- q, bvm, biovec));
- }
- }
- }
- rcu_read_unlock();
- }
- return max;
-
-}
-
static int raid1_congested(struct mddev *mddev, int bits)
{
struct r1conf *conf = mddev->private;
@@ -1268,8 +1235,7 @@ read_again:
break;
}
r1_bio->bios[i] = NULL;
- if (!rdev || test_bit(Faulty, &rdev->flags)
- || test_bit(Unmerged, &rdev->flags)) {
+ if (!rdev || test_bit(Faulty, &rdev->flags)) {
if (i < conf->raid_disks)
set_bit(R1BIO_Degraded, &r1_bio->state);
continue;
@@ -1614,7 +1580,6 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
struct raid1_info *p;
int first = 0;
int last = conf->raid_disks - 1;
- struct request_queue *q = bdev_get_queue(rdev->bdev);
if (mddev->recovery_disabled == conf->recovery_disabled)
return -EBUSY;
@@ -1622,11 +1587,6 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
if (rdev->raid_disk >= 0)
first = last = rdev->raid_disk;
- if (q->merge_bvec_fn) {
- set_bit(Unmerged, &rdev->flags);
- mddev->merge_check_needed = 1;
- }
-
for (mirror = first; mirror <= last; mirror++) {
p = conf->mirrors+mirror;
if (!p->rdev) {
@@ -1658,19 +1618,6 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
break;
}
}
- if (err == 0 && test_bit(Unmerged, &rdev->flags)) {
- /* Some requests might not have seen this new
- * merge_bvec_fn. We must wait for them to complete
- * before merging the device fully.
- * First we make sure any code which has tested
- * our function has submitted the request, then
- * we wait for all outstanding requests to complete.
- */
- synchronize_sched();
- freeze_array(conf, 0);
- unfreeze_array(conf);
- clear_bit(Unmerged, &rdev->flags);
- }
md_integrity_add_rdev(rdev, mddev);
if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev)))
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
@@ -2806,8 +2753,6 @@ static struct r1conf *setup_conf(struct mddev *mddev)
goto abort;
disk->rdev = rdev;
q = bdev_get_queue(rdev->bdev);
- if (q->merge_bvec_fn)
- mddev->merge_check_needed = 1;
disk->head_position = 0;
disk->seq_start = MaxSector;
@@ -3172,7 +3117,6 @@ static struct md_personality raid1_personality =
.quiesce = raid1_quiesce,
.takeover = raid1_takeover,
.congested = raid1_congested,
- .mergeable_bvec = raid1_mergeable_bvec,
};
static int __init raid_init(void)