diff options
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index d45f52edb314..9f0ff7187136 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -339,6 +339,29 @@ static int md_congested(void *data, int bits) return mddev_congested(mddev, bits); } +static int md_mergeable_bvec(struct request_queue *q, + struct bvec_merge_data *bvm, + struct bio_vec *biovec) +{ + struct mddev *mddev = q->queuedata; + int ret; + rcu_read_lock(); + if (mddev->suspended) { + /* Must always allow one vec */ + if (bvm->bi_size == 0) + ret = biovec->bv_len; + else + ret = 0; + } else { + struct md_personality *pers = mddev->pers; + if (pers && pers->mergeable_bvec) + ret = pers->mergeable_bvec(mddev, bvm, biovec); + else + ret = biovec->bv_len; + } + rcu_read_unlock(); + return ret; +} /* * Generic flush handling for md */ @@ -4925,6 +4948,7 @@ int md_run(struct mddev *mddev) if (mddev->queue) { mddev->queue->backing_dev_info.congested_data = mddev; mddev->queue->backing_dev_info.congested_fn = md_congested; + blk_queue_merge_bvec(mddev->queue, md_mergeable_bvec); } if (mddev->pers->sync_request) { if (mddev->kobj.sd && |