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[PATCH] md: choose better default offset for bitmap. 

On reflection, a better default location for hot-adding bitmaps with version-1
superblocks is immediately after the superblock.  There might not be much room
there, but there is usually atleast 3k, and that is a good start.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-09-09 16:23:58 -07:00 committed by Linus Torvalds
parent 500af87abb
commit 53e87fbb5d
1 changed files with 1 additions and 2 deletions
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3
drivers/md/md.c
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@ -957,8 +957,7 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->events = le64_to_cpu(sb->events);
mddev->bitmap_offset = 0;
mddev->default_bitmap_offset = 0;
if (mddev->minor_version == 0)
mddev->default_bitmap_offset = -(64*1024)/512;
mddev->default_bitmap_offset = 1024;
mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
memcpy(mddev->uuid, sb->set_uuid, 16);