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[PATCH] md: allow md to load a superblock with feature-bit '1' set

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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>
This commit is contained in:
NeilBrown 2005-09-09 16:23:51 -07:00 committed by Linus Torvalds
parent 7b1e35f6d6
commit 71c0805cb4
2 changed files with 8 additions and 3 deletions
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6
drivers/md/md.c
View File

@ -875,7 +875,7 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
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 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
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 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
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;

5
include/linux/raid/md_p.h
View File

@ -238,5 +238,10 @@ struct mdp_superblock_1 {
__u16 dev_roles[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
};
/* feature_map bits */
#define MD_FEATURE_BITMAP_OFFSET 1
#define MD_FEATURE_ALL 1
#endif