[PATCH] md: allow md intent bitmap to be stored near the superblock.

This provides an alternate to storing the bitmap in a separate file.  The
bitmap can be stored at a given offset from the superblock.  Obviously the
creator of the array must make sure this doesn't intersect with data....
After is good for version-0.90 superblocks.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 3e977025cf43..a3725b57fb7d 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -273,6 +273,10 @@ struct mddev_s
 
         struct bitmap                   *bitmap; /* the bitmap for the device */
         struct file                     *bitmap_file; /* the bitmap file */
+        long                            bitmap_offset; /* offset from superblock of
+                                                        * start of bitmap. May be
+                                                        * negative, but not '0'
+                                                        */
 
         struct list_head                all_mddevs;
 };