md/bitmap: make sure reshape request are reflected in superblock.

As a reshape may change the sync_size and/or chunk_size, we need
to update these whenever we write out the bitmap superblock.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index a35561f8f57d..8f681da00277 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -420,6 +420,9 @@ void bitmap_update_sb(struct bitmap *bitmap)
         /* Just in case these have been changed via sysfs: */
         sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ);
         sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind);
+        /* This might have been changed by a reshape */
+        sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
+        sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize);
         kunmap_atomic(sb);
         write_page(bitmap, bitmap->storage.sb_page, 1);
 }