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MD: add a new disk role to present write journal device

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Next patches will use a disk as raid5/6 journaling. We need a new disk
role to present the journal device and add MD_FEATURE_JOURNAL to
feature_map for backward compability.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Song Liu 2015-08-13 14:31:55 -07:00 • committed by NeilBrown
parent c4d4c91b44
commit bac624f3f8
3 changed files with 29 additions and 2 deletions
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3
include/uapi/linux/raid/md_p.h
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@ -89,9 +89,11 @@
* read requests will only be sent here in
* dire need
*/
#define MD_DISK_JOURNAL 18 /* disk is used as the write journal in RAID-5/6 */
#define MD_DISK_ROLE_SPARE 0xffff
#define MD_DISK_ROLE_FAULTY 0xfffe
#define MD_DISK_ROLE_JOURNAL 0xfffd
#define MD_DISK_ROLE_MAX 0xff00 /* max value of regular disk role */
typedef struct mdp_device_descriptor_s {
@ -307,6 +309,7 @@ struct mdp_superblock_1 {
* is guided by bitmap.
*/
#define MD_FEATURE_CLUSTERED 256 /* clustered MD */
#define MD_FEATURE_JOURNAL 512 /* support write cache */
#define MD_FEATURE_ALL (MD_FEATURE_BITMAP_OFFSET \
|MD_FEATURE_RECOVERY_OFFSET \
|MD_FEATURE_RESHAPE_ACTIVE \