diff options
Diffstat (limited to 'include/linux/raid/md_u.h')
| -rw-r--r-- | include/linux/raid/md_u.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/raid/md_u.h b/include/linux/raid/md_u.h index 2f824aa889f3..fb1abb3367e9 100644 --- a/include/linux/raid/md_u.h +++ b/include/linux/raid/md_u.h @@ -15,6 +15,24 @@ #ifndef _MD_U_H #define _MD_U_H +/* + * Different major versions are not compatible. + * Different minor versions are only downward compatible. + * Different patchlevel versions are downward and upward compatible. + */ +#define MD_MAJOR_VERSION 0 +#define MD_MINOR_VERSION 90 +/* + * MD_PATCHLEVEL_VERSION indicates kernel functionality. + * >=1 means different superblock formats are selectable using SET_ARRAY_INFO + * and major_version/minor_version accordingly + * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT + * in the super status byte + * >=3 means that bitmap superblock version 4 is supported, which uses + * little-ending representation rather than host-endian + */ +#define MD_PATCHLEVEL_VERSION 3 + /* ioctls */ /* status */ |