THe md-linear is removed by commit 849d18e27be9 ("md: Remove deprecated CONFIG_MD_LINEAR") because it has been marked as deprecated for a long time. However, md-linear is used widely for underlying disks with different size, sadly we didn't know this until now, and it's true useful to create partitions and assemble multiple raid and then append one to the other. People have to use dm-linear in this case now, however, they will prefer to minimize the number of involved modules.
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| @@ -233,7 +233,7 @@ struct mdp_superblock_1 { · 232 unmodified lines | |||
| 233 | char set_name[32]; /* set and interpreted by user-space */ | 233 | char set_name[32]; /* set and interpreted by user-space */ |
| 234 | 234 | ||
| 235 | __le64 ctime; /* lo 40 bits are seconds, top 24 are microseconds or 0*/ | 235 | __le64 ctime; /* lo 40 bits are seconds, top 24 are microseconds or 0*/ |
| 236 | __le32 level; /* 0,1,4,5 */ | 236 | __le32 level; /* 0,1,4,5, -1 (linear) */ |
| 237 | __le32 layout; /* only for raid5 and raid10 currently */ | 237 | __le32 layout; /* only for raid5 and raid10 currently */ |
| 238 | __le64 size; /* used size of component devices, in 512byte sectors */ | 238 | __le64 size; /* used size of component devices, in 512byte sectors */ |
| 239 | 239 | ||
| @@ -103,6 +103,8 @@ typedef struct mdu_array_info_s { · 102 unmodified lines | |||
| 103 | 103 | ||
| 104 | } mdu_array_info_t; | 104 | } mdu_array_info_t; |
| 105 | 105 | ||
| 106 | #define LEVEL_LINEAR (-1) | ||
| 107 | |||
| 106 | /* we need a value for 'no level specified' and 0 | 108 | /* we need a value for 'no level specified' and 0 |
| 107 | * means 'raid0', so we need something else. This is | 109 | * means 'raid0', so we need something else. This is |
| 108 | * for internal use only | 110 | * for internal use only |