md-raid0: conditional mddev->queue access to suit dm-raid

[mirror_ubuntu-artful-kernel.git] / drivers / md / raid0.c

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 3ed9f42ddca65e10351a1a453f16383e63c52634..6a68ef5246d49962c5be7b152f8f121f61d4de04 100644 (file)
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -188,8 +188,9 @@ static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf)
                }
                dev[j] = rdev1;
 
-               disk_stack_limits(mddev->gendisk, rdev1->bdev,
-                                 rdev1->data_offset << 9);
+               if (mddev->queue)
+                       disk_stack_limits(mddev->gendisk, rdev1->bdev,
+                                         rdev1->data_offset << 9);
 
                if (rdev1->bdev->bd_disk->queue->merge_bvec_fn)
                        conf->has_merge_bvec = 1;
@@ -271,14 +272,16 @@ static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf)
                goto abort;
        }
 
-       blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
-       blk_queue_io_opt(mddev->queue,
-                        (mddev->chunk_sectors << 9) * mddev->raid_disks);
+       if (mddev->queue) {
+               blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
+               blk_queue_io_opt(mddev->queue,
+                                (mddev->chunk_sectors << 9) * mddev->raid_disks);
 
-       if (!discard_supported)
-               queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
-       else
-               queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
+               if (!discard_supported)
+                       queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
+               else
+                       queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
+       }
 
        pr_debug("md/raid0:%s: done.\n", mdname(mddev));
        *private_conf = conf;
@@ -313,7 +316,7 @@ static struct strip_zone *find_zone(struct r0conf *conf,
 
 /*
  * remaps the bio to the target device. we separate two flows.
- * power 2 flow and a general flow for the sake of perfromance
+ * power 2 flow and a general flow for the sake of performance
 */
 static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone,
                                sector_t sector, sector_t *sector_offset)
@@ -429,9 +432,12 @@ static int raid0_run(struct mddev *mddev)
        }
        if (md_check_no_bitmap(mddev))
                return -EINVAL;
-       blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
-       blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
-       blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors);
+
+       if (mddev->queue) {
+               blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
+               blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
+               blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors);
+       }
 
        /* if private is not null, we are here after takeover */
        if (mddev->private == NULL) {
@@ -448,16 +454,17 @@ static int raid0_run(struct mddev *mddev)
        printk(KERN_INFO "md/raid0:%s: md_size is %llu sectors.\n",
               mdname(mddev),
               (unsigned long long)mddev->array_sectors);
-       /* calculate the max read-ahead size.
-        * For read-ahead of large files to be effective, we need to
-        * readahead at least twice a whole stripe. i.e. number of devices
-        * multiplied by chunk size times 2.
-        * If an individual device has an ra_pages greater than the
-        * chunk size, then we will not drive that device as hard as it
-        * wants.  We consider this a configuration error: a larger
-        * chunksize should be used in that case.
-        */
-       {
+
+       if (mddev->queue) {
+               /* calculate the max read-ahead size.
+                * For read-ahead of large files to be effective, we need to
+                * readahead at least twice a whole stripe. i.e. number of devices
+                * multiplied by chunk size times 2.
+                * If an individual device has an ra_pages greater than the
+                * chunk size, then we will not drive that device as hard as it
+                * wants.  We consider this a configuration error: a larger
+                * chunksize should be used in that case.
+                */
                int stripe = mddev->raid_disks *
                        (mddev->chunk_sectors << 9) / PAGE_SIZE;
                if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)
@@ -524,6 +531,7 @@ static void raid0_make_request(struct mddev *mddev, struct bio *bio)
                        split = bio;
                }
 
+               sector = bio->bi_iter.bi_sector;
                zone = find_zone(mddev->private, &sector);
                tmp_dev = map_sector(mddev, zone, sector, &sector);
                split->bi_bdev = tmp_dev->bdev;