Create n bitmaps for clustered mode

For a clustered MD, create bitmaps equal to number of nodes so
each node has an independent bitmap.

Only the first bitmap is has the bits set so that the first node
that assembles the device also performs the sync.

The bitmaps are aligned to 4k boundaries.

On-disk format:

0                    4k                     8k                    12k
-------------------------------------------------------------------
| idle                | md super            | bm super [0] + bits |
| bm bits[0, contd]   | bm super[1] + bits  | bm bits[1, contd]   |
| bm super[2] + bits  | bm bits [2, contd]  | bm super[3] + bits  |
| bm bits [3, contd]  |                     |                     |

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/bitmap.c b/bitmap.c
index b1d54a6f..920033ad 100644
--- a/bitmap.c
+++ b/bitmap.c
@@ -32,6 +32,8 @@ inline void sb_le_to_cpu(bitmap_super_t *sb)
 	sb->daemon_sleep = __le32_to_cpu(sb->daemon_sleep);
 	sb->sync_size = __le64_to_cpu(sb->sync_size);
 	sb->write_behind = __le32_to_cpu(sb->write_behind);
+	sb->nodes = __le32_to_cpu(sb->nodes);
+	sb->sectors_reserved = __le32_to_cpu(sb->sectors_reserved);
 }
 
 inline void sb_cpu_to_le(bitmap_super_t *sb)