[PATCH] md: allow a linear array to have drives added while active

[mv-sheeva.git] / drivers / md / md.c

diff --git a/drivers/md/md.c b/drivers/md/md.c
index a296edd7e1c34059d734752613fa05ba7aa6780f..2ce750d4be023922bcba40753c4897a64a736c90 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -817,8 +817,8 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
 
                if (desc->state & (1<<MD_DISK_FAULTY))
                        set_bit(Faulty, &rdev->flags);
-               else if (desc->state & (1<<MD_DISK_SYNC) &&
-                        desc->raid_disk < mddev->raid_disks) {
+               else if (desc->state & (1<<MD_DISK_SYNC) /* &&
+                           desc->raid_disk < mddev->raid_disks */) {
                        set_bit(In_sync, &rdev->flags);
                        rdev->raid_disk = desc->raid_disk;
                }
@@ -3359,6 +3359,17 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
 
                rdev->raid_disk = -1;
                err = bind_rdev_to_array(rdev, mddev);
+               if (!err && !mddev->pers->hot_remove_disk) {
+                       /* If there is hot_add_disk but no hot_remove_disk
+                        * then added disks for geometry changes,
+                        * and should be added immediately.
+                        */
+                       super_types[mddev->major_version].
+                               validate_super(mddev, rdev);
+                       err = mddev->pers->hot_add_disk(mddev, rdev);
+                       if (err)
+                               unbind_rdev_from_array(rdev);
+               }
                if (err)
                        export_rdev(rdev);