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-rw-r--r--include/uapi/linux/raid/md_p.h2
-rw-r--r--include/uapi/linux/raid/md_u.h2
2 files changed, 3 insertions, 1 deletions
diff --git a/include/uapi/linux/raid/md_p.h b/include/uapi/linux/raid/md_p.h
index 5a43c23f53bf..ff47b6f0ba0f 100644
--- a/include/uapi/linux/raid/md_p.h
+++ b/include/uapi/linux/raid/md_p.h
@@ -233,7 +233,7 @@ struct mdp_superblock_1 {
char set_name[32]; /* set and interpreted by user-space */
__le64 ctime; /* lo 40 bits are seconds, top 24 are microseconds or 0*/
- __le32 level; /* 0,1,4,5 */
+ __le32 level; /* 0,1,4,5, -1 (linear) */
__le32 layout; /* only for raid5 and raid10 currently */
__le64 size; /* used size of component devices, in 512byte sectors */
diff --git a/include/uapi/linux/raid/md_u.h b/include/uapi/linux/raid/md_u.h
index 7be89a4906e7..a893010735fb 100644
--- a/include/uapi/linux/raid/md_u.h
+++ b/include/uapi/linux/raid/md_u.h
@@ -103,6 +103,8 @@ typedef struct mdu_array_info_s {
} mdu_array_info_t;
+#define LEVEL_LINEAR (-1)
+
/* we need a value for 'no level specified' and 0
* means 'raid0', so we need something else. This is
* for internal use only