1 files changed, 22 insertions, 6 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index f9f991e6e138..37835538b58e 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3699,13 +3699,21 @@ static int make_request(struct request_queue *q, struct bio * bi)
                                         goto retry;
                                 }
                         }
-                        /* FIXME what if we get a false positive because these
-                         * are being updated.
-                         */
-                        if (logical_sector >= mddev->suspend_lo &&
+
+                        if (bio_data_dir(bi) == WRITE &&
+                            logical_sector >= mddev->suspend_lo &&
                             logical_sector < mddev->suspend_hi) {
                                 release_stripe(sh);
-                                schedule();
+                                /* As the suspend_* range is controlled by
+                                 * userspace, we want an interruptible
+                                 * wait.
+                                 */
+                                flush_signals(current);
+                                prepare_to_wait(&conf->wait_for_overlap,
+                                                &w, TASK_INTERRUPTIBLE);
+                                if (logical_sector >= mddev->suspend_lo &&
+                                    logical_sector < mddev->suspend_hi)
+                                        schedule();
                                 goto retry;
                         }
 
@@ -4452,7 +4460,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
 static int run(mddev_t *mddev)
 {
         raid5_conf_t *conf;
-        int working_disks = 0;
+        int working_disks = 0, chunk_size;
         mdk_rdev_t *rdev;
 
         if (mddev->recovery_cp != MaxSector)
@@ -4607,6 +4615,14 @@ static int run(mddev_t *mddev)
         md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
 
         blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec);
+        chunk_size = mddev->chunk_sectors << 9;
+        blk_queue_io_min(mddev->queue, chunk_size);
+        blk_queue_io_opt(mddev->queue, chunk_size *
+                         (conf->raid_disks - conf->max_degraded));
+
+        list_for_each_entry(rdev, &mddev->disks, same_set)
+                disk_stack_limits(mddev->gendisk, rdev->bdev,
+                                  rdev->data_offset << 9);
 
         return 0;
 abort: