[PATCH] md: set default_bitmap_offset properly in set_array_info

If an array is created using set_array_info, default_bitmap_offset isn't set
properly meaning that an internal bitmap cannot be hot-added until the array
is stopped and re-assembled.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 78c7418478d..cd12fca73b0 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1028,7 +1028,6 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
                 mddev->size = le64_to_cpu(sb->size)/2;
                 mddev->events = le64_to_cpu(sb->events);
                 mddev->bitmap_offset = 0;
-                mddev->default_bitmap_offset = 0;
                 mddev->default_bitmap_offset = 1024;
                 
                 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
@@ -2932,6 +2931,9 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
 
         mddev->sb_dirty      = 1;
 
+        mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
+        mddev->bitmap_offset = 0;
+
         /*
          * Generate a 128 bit UUID
          */