md: allow a maximum extent to be set for resyncing

[safe/jmp/linux-2.6] / drivers / md / raid5.c

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 388a974..e946de6 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3698,6 +3698,25 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
                release_stripe(sh);
                first_sector += STRIPE_SECTORS;
        }
+       /* If this takes us to the resync_max point where we have to pause,
+        * then we need to write out the superblock.
+        */
+       sector_nr += conf->chunk_size>>9;
+       if (sector_nr >= mddev->resync_max) {
+               /* Cannot proceed until we've updated the superblock... */
+               wait_event(conf->wait_for_overlap,
+                          atomic_read(&conf->reshape_stripes) == 0);
+               mddev->reshape_position = conf->expand_progress;
+               set_bit(MD_CHANGE_DEVS, &mddev->flags);
+               md_wakeup_thread(mddev->thread);
+               wait_event(mddev->sb_wait,
+                          !test_bit(MD_CHANGE_DEVS, &mddev->flags)
+                          || kthread_should_stop());
+               spin_lock_irq(&conf->device_lock);
+               conf->expand_lo = mddev->reshape_position;
+               spin_unlock_irq(&conf->device_lock);
+               wake_up(&conf->wait_for_overlap);
+       }
        return conf->chunk_size>>9;
 }
 
@@ -3734,6 +3753,12 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
        if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
                return reshape_request(mddev, sector_nr, skipped);
 
+       /* No need to check resync_max as we never do more than one
+        * stripe, and as resync_max will always be on a chunk boundary,
+        * if the check in md_do_sync didn't fire, there is no chance
+        * of overstepping resync_max here
+        */
+
        /* if there is too many failed drives and we are trying
         * to resync, then assert that we are finished, because there is
         * nothing we can do.