md:Add support for Raid0->Raid5 takeover

[safe/jmp/linux-2.6] / drivers / md / linear.c

diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 5fe39c2..9db8ee0 100644 (file)
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -108,6 +108,9 @@ static int linear_congested(void *data, int bits)
        linear_conf_t *conf;
        int i, ret = 0;
 
+       if (mddev_congested(mddev, bits))
+               return 1;
+
        rcu_read_lock();
        conf = rcu_dereference(mddev->private);
 
@@ -169,12 +172,14 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
                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_sector to one PAGE, as
-                * a one page request is never in violation.
+                * violating it, so limit max_segments to 1 lying within
+                * a single page.
                 */
-               if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                   queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
-                       blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
+               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);
+               }
 
                conf->array_sectors += rdev->sectors;
                cnt++;
@@ -276,6 +281,7 @@ static int linear_stop (mddev_t *mddev)
        rcu_barrier();
        blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
        kfree(conf);
+       mddev->private = NULL;
 
        return 0;
 }
@@ -288,8 +294,8 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
        sector_t start_sector;
        int cpu;
 
-       if (unlikely(bio_barrier(bio))) {
-               bio_endio(bio, -EOPNOTSUPP);
+       if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
+               md_barrier_request(mddev, bio);
                return 0;
        }
 
@@ -380,6 +386,7 @@ static void linear_exit (void)
 module_init(linear_init);
 module_exit(linear_exit);
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Linear device concatenation personality for MD");
 MODULE_ALIAS("md-personality-1"); /* LINEAR - deprecated*/
 MODULE_ALIAS("md-linear");
 MODULE_ALIAS("md-level--1");