1c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 2c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru md_p.h : physical layout of Linux RAID devices 3c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman 4c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 5c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru This program is free software; you can redistribute it and/or modify 6c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru it under the terms of the GNU General Public License as published by 7c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru the Free Software Foundation; either version 2, or (at your option) 8c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru any later version. 9c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 10c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru You should have received a copy of the GNU General Public License 11c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru (for example /usr/src/linux/COPYING); if not, write to the Free 12c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 13c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru*/ 14c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 15c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef _MD_P_H 16c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define _MD_P_H 17c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 18c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 19c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * RAID superblock. 20c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 21c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The RAID superblock maintains some statistics on each RAID configuration. 22c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Each real device in the RAID set contains it near the end of the device. 23c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Some of the ideas are copied from the ext2fs implementation. 24c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 25c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * We currently use 4096 bytes as follows: 26c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 27c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * word offset function 28c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 29c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 0 - 31 Constant generic RAID device information. 30c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 32 - 63 Generic state information. 31c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 64 - 127 Personality specific information. 32c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 128 - 511 12 32-words descriptors of the disks in the raid set. 33c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 512 - 911 Reserved. 34c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 912 - 1023 Disk specific descriptor. 35c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 36c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 37c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 38c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * If x is the real device size in bytes, we return an apparent size of: 39c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 40c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES 41c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 42c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * and place the 4kB superblock at offset y. 43c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 44c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_RESERVED_BYTES (64 * 1024) 45c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_RESERVED_SECTORS (MD_RESERVED_BYTES / 512) 46c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_RESERVED_BLOCKS (MD_RESERVED_BYTES / BLOCK_SIZE) 47c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 48c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_NEW_SIZE_SECTORS(x) ((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS) 49c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_NEW_SIZE_BLOCKS(x) ((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS) 50c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 51c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_BYTES 4096 52c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_WORDS (MD_SB_BYTES / 4) 53c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_BLOCKS (MD_SB_BYTES / BLOCK_SIZE) 54c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_SECTORS (MD_SB_BYTES / 512) 55c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 56c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 57c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The following are counted in 32-bit words 58c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 59c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_GENERIC_OFFSET 0 60c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_PERSONALITY_OFFSET 64 61c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_DISKS_OFFSET 128 62c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_DESCRIPTOR_OFFSET 992 63c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 64c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_GENERIC_CONSTANT_WORDS 32 65c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_GENERIC_STATE_WORDS 32 66c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_GENERIC_WORDS (MD_SB_GENERIC_CONSTANT_WORDS + MD_SB_GENERIC_STATE_WORDS) 67c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_PERSONALITY_WORDS 64 68c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_DESCRIPTOR_WORDS 32 69c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_DISKS 27 70c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_DISKS_WORDS (MD_SB_DISKS*MD_SB_DESCRIPTOR_WORDS) 71c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_RESERVED_WORDS (1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_WORDS - MD_SB_DESCRIPTOR_WORDS) 72c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_EQUAL_WORDS (MD_SB_GENERIC_WORDS + MD_SB_PERSONALITY_WORDS + MD_SB_DISKS_WORDS) 73c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 74c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 75c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Device "operational" state bits 76c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 77c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_DISK_FAULTY 0 /* disk is faulty / operational */ 78c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_DISK_ACTIVE 1 /* disk is running or spare disk */ 79c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_DISK_SYNC 2 /* disk is in sync with the raid set */ 80c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_DISK_REMOVED 3 /* disk is in sync with the raid set */ 81c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 82c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_DISK_WRITEMOSTLY 9 /* disk is "write-mostly" is RAID1 config. 83c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * read requests will only be sent here in 84c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * dire need 85c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 86c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 87c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef struct mdp_device_descriptor_s { 88c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 number; /* 0 Device number in the entire set */ 89c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 major; /* 1 Device major number */ 90c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 minor; /* 2 Device minor number */ 91c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 raid_disk; /* 3 The role of the device in the raid set */ 92c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 state; /* 4 Operational state */ 93c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5]; 94c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} mdp_disk_t; 95c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 96c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_MAGIC 0xa92b4efc 97c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 98c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 99c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Superblock state bits 100c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 101c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_CLEAN 0 102c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_ERRORS 1 103c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 104c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_SB_BITMAP_PRESENT 8 /* bitmap may be present nearby */ 105c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 106c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 107c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Notes: 108c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * - if an array is being reshaped (restriped) in order to change the 109c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the number of active devices in the array, 'raid_disks' will be 110c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the larger of the old and new numbers. 'delta_disks' will 111c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * be the "new - old". So if +ve, raid_disks is the new value, and 112c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * "raid_disks-delta_disks" is the old. If -ve, raid_disks is the 113c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * old value and "raid_disks+delta_disks" is the new (smaller) value. 114c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 115c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 116c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 117c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef struct mdp_superblock_s { 118c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 119c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Constant generic information 120c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 121c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 md_magic; /* 0 MD identifier */ 122c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 major_version; /* 1 major version to which the set conforms */ 123c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 minor_version; /* 2 minor version ... */ 124c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 patch_version; /* 3 patchlevel version ... */ 125c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 gvalid_words; /* 4 Number of used words in this section */ 126c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 set_uuid0; /* 5 Raid set identifier */ 127c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 ctime; /* 6 Creation time */ 128c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 level; /* 7 Raid personality */ 129c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 size; /* 8 Apparent size of each individual disk */ 130c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 nr_disks; /* 9 total disks in the raid set */ 131c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 raid_disks; /* 10 disks in a fully functional raid set */ 132c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 md_minor; /* 11 preferred MD minor device number */ 133c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 not_persistent; /* 12 does it have a persistent superblock */ 134c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 set_uuid1; /* 13 Raid set identifier #2 */ 135c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 set_uuid2; /* 14 Raid set identifier #3 */ 136c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 set_uuid3; /* 15 Raid set identifier #4 */ 137c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 16]; 138c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 139c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 140c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Generic state information 141c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 142c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 utime; /* 0 Superblock update time */ 143c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 state; /* 1 State bits (clean, ...) */ 144c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 active_disks; /* 2 Number of currently active disks */ 145c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 working_disks; /* 3 Number of working disks */ 146c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 failed_disks; /* 4 Number of failed disks */ 147c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 spare_disks; /* 5 Number of spare disks */ 148c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 sb_csum; /* 6 checksum of the whole superblock */ 149c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef __BIG_ENDIAN 150c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 events_hi; /* 7 high-order of superblock update count */ 151c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 events_lo; /* 8 low-order of superblock update count */ 152c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 cp_events_hi; /* 9 high-order of checkpoint update count */ 153c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 cp_events_lo; /* 10 low-order of checkpoint update count */ 154c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 155c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 events_lo; /* 7 low-order of superblock update count */ 156c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 events_hi; /* 8 high-order of superblock update count */ 157c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 cp_events_lo; /* 9 low-order of checkpoint update count */ 158c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 cp_events_hi; /* 10 high-order of checkpoint update count */ 159c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 160c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 recovery_cp; /* 11 recovery checkpoint sector count */ 161c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* There are only valid for minor_version > 90 */ 162c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 reshape_position; /* 12,13 next address in array-space for reshape */ 163c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 new_level; /* 14 new level we are reshaping to */ 164c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 delta_disks; /* 15 change in number of raid_disks */ 165c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 new_layout; /* 16 new layout */ 166c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 new_chunk; /* 17 new chunk size (bytes) */ 167c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 18]; 168c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 169c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 170c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Personality information 171c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 172c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 layout; /* 0 the array's physical layout */ 173c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 chunk_size; /* 1 chunk size in bytes */ 174c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 root_pv; /* 2 LV root PV */ 175c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 root_block; /* 3 LV root block */ 176c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 4]; 177c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 178c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 179c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Disks information 180c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 181c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru mdp_disk_t disks[MD_SB_DISKS]; 182c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 183c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 184c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Reserved 185c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 186c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 reserved[MD_SB_RESERVED_WORDS]; 187c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 188c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 189c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Active descriptor 190c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 191c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru mdp_disk_t this_disk; 192c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 193c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} mdp_super_t; 194c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 195c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline __u64 md_event(mdp_super_t *sb) { 196c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 ev = sb->events_hi; 197c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return (ev<<32)| sb->events_lo; 198c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 199c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 200c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 201c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The version-1 superblock : 202c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * All numeric fields are little-endian. 203c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 204c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * total size: 256 bytes plus 2 per device. 205c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1K allows 384 devices. 206c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 207c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct mdp_superblock_1 { 208c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* constant array information - 128 bytes */ 209c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 magic; /* MD_SB_MAGIC: 0xa92b4efc - little endian */ 210c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 major_version; /* 1 */ 211c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 feature_map; /* bit 0 set if 'bitmap_offset' is meaningful */ 212c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 pad0; /* always set to 0 when writing */ 213c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 214c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u8 set_uuid[16]; /* user-space generated. */ 215c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru char set_name[32]; /* set and interpreted by user-space */ 216c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 217c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 ctime; /* lo 40 bits are seconds, top 24 are microseconds or 0*/ 218c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 level; /* -4 (multipath), -1 (linear), 0,1,4,5 */ 219c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 layout; /* only for raid5 and raid10 currently */ 220c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 size; /* used size of component devices, in 512byte sectors */ 221c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 222c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 chunksize; /* in 512byte sectors */ 223c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 raid_disks; 224c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 bitmap_offset; /* sectors after start of superblock that bitmap starts 225c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * NOTE: signed, so bitmap can be before superblock 226c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * only meaningful of feature_map[0] is set. 227c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 228c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 229c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* These are only valid with feature bit '4' */ 230c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 new_level; /* new level we are reshaping to */ 231c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 reshape_position; /* next address in array-space for reshape */ 232c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 delta_disks; /* change in number of raid_disks */ 233c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 new_layout; /* new layout */ 234c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 new_chunk; /* new chunk size (bytes) */ 235c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u8 pad1[128-124]; /* set to 0 when written */ 236c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 237c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* constant this-device information - 64 bytes */ 238c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 data_offset; /* sector start of data, often 0 */ 239c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 data_size; /* sectors in this device that can be used for data */ 240c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 super_offset; /* sector start of this superblock */ 241c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 recovery_offset;/* sectors before this offset (from data_offset) have been recovered */ 242c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 dev_number; /* permanent identifier of this device - not role in raid */ 243c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 cnt_corrected_read; /* number of read errors that were corrected by re-writing */ 244c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u8 device_uuid[16]; /* user-space setable, ignored by kernel */ 245c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u8 devflags; /* per-device flags. Only one defined...*/ 246c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define WriteMostly1 1 /* mask for writemostly flag in above */ 247c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u8 pad2[64-57]; /* set to 0 when writing */ 248c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 249c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* array state information - 64 bytes */ 250c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 utime; /* 40 bits second, 24 btes microseconds */ 251c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 events; /* incremented when superblock updated */ 252c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u64 resync_offset; /* data before this offset (from data_offset) known to be in sync */ 253c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 sb_csum; /* checksum upto devs[max_dev] */ 254c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 max_dev; /* size of devs[] array to consider */ 255c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u8 pad3[64-32]; /* set to 0 when writing */ 256c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 257c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* device state information. Indexed by dev_number. 258c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 2 bytes per device 259c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Note there are no per-device state flags. State information is rolled 260c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * into the 'roles' value. If a device is spare or faulty, then it doesn't 261c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * have a meaningful role. 262c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 263c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u16 dev_roles[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */ 264c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 265c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 266c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* feature_map bits */ 267c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_FEATURE_BITMAP_OFFSET 1 268c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_FEATURE_RECOVERY_OFFSET 2 /* recovery_offset is present and 269c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * must be honoured 270c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 271c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_FEATURE_RESHAPE_ACTIVE 4 272c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 273c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MD_FEATURE_ALL (1|2|4) 274c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 275c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 276c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 277