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-rw-r--r--drivers/md/raid1.c98
1 files changed, 73 insertions, 25 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index a0b225eb4ac..4a40a200d76 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -523,6 +523,7 @@ 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) &&
@@ -614,6 +615,39 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
return best_disk;
}
+static int raid1_mergeable_bvec(struct request_queue *q,
+ struct bvec_merge_data *bvm,
+ struct bio_vec *biovec)
+{
+ struct mddev *mddev = q->queuedata;
+ 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;
+
+}
+
int md_raid1_congested(struct mddev *mddev, int bits)
{
struct r1conf *conf = mddev->private;
@@ -737,9 +771,22 @@ static void wait_barrier(struct r1conf *conf)
spin_lock_irq(&conf->resync_lock);
if (conf->barrier) {
conf->nr_waiting++;
- wait_event_lock_irq(conf->wait_barrier, !conf->barrier,
+ /* Wait for the barrier to drop.
+ * However if there are already pending
+ * requests (preventing the barrier from
+ * rising completely), and the
+ * pre-process bio queue isn't empty,
+ * then don't wait, as we need to empty
+ * that queue to get the nr_pending
+ * count down.
+ */
+ wait_event_lock_irq(conf->wait_barrier,
+ !conf->barrier ||
+ (conf->nr_pending &&
+ current->bio_list &&
+ !bio_list_empty(current->bio_list)),
conf->resync_lock,
- );
+ );
conf->nr_waiting--;
}
conf->nr_pending++;
@@ -1002,7 +1049,8 @@ read_again:
break;
}
r1_bio->bios[i] = NULL;
- if (!rdev || test_bit(Faulty, &rdev->flags)) {
+ if (!rdev || test_bit(Faulty, &rdev->flags)
+ || test_bit(Unmerged, &rdev->flags)) {
if (i < conf->raid_disks)
set_bit(R1BIO_Degraded, &r1_bio->state);
continue;
@@ -1322,6 +1370,7 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
struct mirror_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;
@@ -1329,23 +1378,17 @@ 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) {
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
- /* as we don't honour merge_bvec_fn, we must
- * never risk violating it, so limit
- * ->max_segments to one lying with a single
- * page, as a one page request is never in
- * violation.
- */
- if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
- blk_queue_max_segments(mddev->queue, 1);
- blk_queue_segment_boundary(mddev->queue,
- PAGE_CACHE_SIZE - 1);
- }
p->head_position = 0;
rdev->raid_disk = mirror;
@@ -1370,6 +1413,19 @@ 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();
+ raise_barrier(conf);
+ lower_barrier(conf);
+ clear_bit(Unmerged, &rdev->flags);
+ }
md_integrity_add_rdev(rdev, mddev);
print_conf(conf);
return err;
@@ -2491,7 +2547,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
err = -EINVAL;
spin_lock_init(&conf->device_lock);
- list_for_each_entry(rdev, &mddev->disks, same_set) {
+ rdev_for_each(rdev, mddev) {
int disk_idx = rdev->raid_disk;
if (disk_idx >= mddev->raid_disks
|| disk_idx < 0)
@@ -2609,20 +2665,11 @@ static int run(struct mddev *mddev)
if (IS_ERR(conf))
return PTR_ERR(conf);
- list_for_each_entry(rdev, &mddev->disks, same_set) {
+ rdev_for_each(rdev, mddev) {
if (!mddev->gendisk)
continue;
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
- /* as we don't honour merge_bvec_fn, we must never risk
- * violating it, so limit ->max_segments to 1 lying within
- * a single page, as a one page request is never in violation.
- */
- if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
- blk_queue_max_segments(mddev->queue, 1);
- blk_queue_segment_boundary(mddev->queue,
- PAGE_CACHE_SIZE - 1);
- }
}
mddev->degraded = 0;
@@ -2656,6 +2703,7 @@ static int run(struct mddev *mddev)
if (mddev->queue) {
mddev->queue->backing_dev_info.congested_fn = raid1_congested;
mddev->queue->backing_dev_info.congested_data = mddev;
+ blk_queue_merge_bvec(mddev->queue, raid1_mergeable_bvec);
}
return md_integrity_register(mddev);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-12 07:01:49 +0000