[PATCH] md: allow md to load a superblock with feature-bit '1' set
As this is used to flag an internal bitmap.
Also, introduce symbolic names for feature bits.
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>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 866c704..1be3f2d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -875,7 +875,7 @@
sb->major_version != cpu_to_le32(1) ||
le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
- sb->feature_map != 0)
+ (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
return -EINVAL;
if (calc_sb_1_csum(sb) != sb->sb_csum) {
@@ -954,7 +954,7 @@
mddev->max_disks = (4096-256)/2;
- if ((le32_to_cpu(sb->feature_map) & 1) &&
+ if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
mddev->bitmap_file == NULL ) {
if (mddev->level != 1) {
printk(KERN_WARNING "md: bitmaps only supported for raid1\n");
@@ -1029,7 +1029,7 @@
if (mddev->bitmap && mddev->bitmap_file == NULL) {
sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
- sb->feature_map = cpu_to_le32(1);
+ sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
}
max_dev = 0;