| /* |
| md_p.h : physical layout of Linux RAID devices |
| Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| You should have received a copy of the GNU General Public License |
| (for example /usr/src/linux/COPYING); if not, write to the Free |
| Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #ifndef _MD_P_H |
| #define _MD_P_H |
| |
| /* |
| * RAID superblock. |
| * |
| * The RAID superblock maintains some statistics on each RAID configuration. |
| * Each real device in the RAID set contains it near the end of the device. |
| * Some of the ideas are copied from the ext2fs implementation. |
| * |
| * We currently use 4096 bytes as follows: |
| * |
| * word offset function |
| * |
| * 0 - 31 Constant generic RAID device information. |
| * 32 - 63 Generic state information. |
| * 64 - 127 Personality specific information. |
| * 128 - 511 12 32-words descriptors of the disks in the raid set. |
| * 512 - 911 Reserved. |
| * 912 - 1023 Disk specific descriptor. |
| */ |
| |
| /* |
| * If x is the real device size in bytes, we return an apparent size of: |
| * |
| * y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES |
| * |
| * and place the 4kB superblock at offset y. |
| */ |
| #define MD_RESERVED_BYTES (64 * 1024) |
| #define MD_RESERVED_SECTORS (MD_RESERVED_BYTES / 512) |
| #define MD_RESERVED_BLOCKS (MD_RESERVED_BYTES / BLOCK_SIZE) |
| |
| #define MD_NEW_SIZE_SECTORS(x) ((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS) |
| #define MD_NEW_SIZE_BLOCKS(x) ((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS) |
| |
| #define MD_SB_BYTES 4096 |
| #define MD_SB_WORDS (MD_SB_BYTES / 4) |
| #define MD_SB_BLOCKS (MD_SB_BYTES / BLOCK_SIZE) |
| #define MD_SB_SECTORS (MD_SB_BYTES / 512) |
| |
| /* |
| * The following are counted in 32-bit words |
| */ |
| #define MD_SB_GENERIC_OFFSET 0 |
| #define MD_SB_PERSONALITY_OFFSET 64 |
| #define MD_SB_DISKS_OFFSET 128 |
| #define MD_SB_DESCRIPTOR_OFFSET 992 |
| |
| #define MD_SB_GENERIC_CONSTANT_WORDS 32 |
| #define MD_SB_GENERIC_STATE_WORDS 32 |
| #define MD_SB_GENERIC_WORDS (MD_SB_GENERIC_CONSTANT_WORDS + MD_SB_GENERIC_STATE_WORDS) |
| #define MD_SB_PERSONALITY_WORDS 64 |
| #define MD_SB_DESCRIPTOR_WORDS 32 |
| #define MD_SB_DISKS 27 |
| #define MD_SB_DISKS_WORDS (MD_SB_DISKS*MD_SB_DESCRIPTOR_WORDS) |
| #define MD_SB_RESERVED_WORDS (1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_WORDS - MD_SB_DESCRIPTOR_WORDS) |
| #define MD_SB_EQUAL_WORDS (MD_SB_GENERIC_WORDS + MD_SB_PERSONALITY_WORDS + MD_SB_DISKS_WORDS) |
| |
| /* |
| * Device "operational" state bits |
| */ |
| #define MD_DISK_FAULTY 0 /* disk is faulty / operational */ |
| #define MD_DISK_ACTIVE 1 /* disk is running but may not be in sync */ |
| #define MD_DISK_SYNC 2 /* disk is in sync with the raid set */ |
| #define MD_DISK_REMOVED 3 /* disk is in sync with the raid set */ |
| #define MD_DISK_CLUSTER_ADD 4 /* Initiate a disk add across the cluster |
| * For clustered enviroments only. |
| */ |
| #define MD_DISK_CANDIDATE 5 /* disk is added as spare (local) until confirmed |
| * For clustered enviroments only. |
| */ |
| |
| #define MD_DISK_WRITEMOSTLY 9 /* disk is "write-mostly" is RAID1 config. |
| * read requests will only be sent here in |
| * dire need |
| */ |
| #define MD_DISK_FAILFAST 10 /* Fewer retries, more failures */ |
| |
| #define MD_DISK_REPLACEMENT 17 |
| #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 { |
| __u32 number; /* 0 Device number in the entire set */ |
| __u32 major; /* 1 Device major number */ |
| __u32 minor; /* 2 Device minor number */ |
| __u32 raid_disk; /* 3 The role of the device in the raid set */ |
| __u32 state; /* 4 Operational state */ |
| __u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5]; |
| } mdp_disk_t; |
| |
| #define MD_SB_MAGIC 0xa92b4efc |
| |
| /* |
| * Superblock state bits |
| */ |
| #define MD_SB_CLEAN 0 |
| #define MD_SB_ERRORS 1 |
| #define MD_SB_BBM_ERRORS 2 |
| #define MD_SB_BLOCK_CONTAINER_RESHAPE 3 /* block container wide reshapes */ |
| #define MD_SB_BLOCK_VOLUME 4 /* block activation of array, other arrays |
| * in container can be activated */ |
| #define MD_SB_CLUSTERED 5 /* MD is clustered */ |
| #define MD_SB_BITMAP_PRESENT 8 /* bitmap may be present nearby */ |
| |
| typedef struct mdp_superblock_s { |
| /* |
| * Constant generic information |
| */ |
| __u32 md_magic; /* 0 MD identifier */ |
| __u32 major_version; /* 1 major version to which the set conforms */ |
| __u32 minor_version; /* 2 minor version ... */ |
| __u32 patch_version; /* 3 patchlevel version ... */ |
| __u32 gvalid_words; /* 4 Number of used words in this section */ |
| __u32 set_uuid0; /* 5 Raid set identifier */ |
| __u32 ctime; /* 6 Creation time */ |
| __u32 level; /* 7 Raid personality */ |
| __u32 size; /* 8 Apparent size of each individual disk */ |
| __u32 nr_disks; /* 9 total disks in the raid set */ |
| __u32 raid_disks; /* 10 disks in a fully functional raid set */ |
| __u32 md_minor; /* 11 preferred MD minor device number */ |
| __u32 not_persistent; /* 12 does it have a persistent superblock */ |
| __u32 set_uuid1; /* 13 Raid set identifier #2 */ |
| __u32 set_uuid2; /* 14 Raid set identifier #3 */ |
| __u32 set_uuid3; /* 15 Raid set identifier #4 */ |
| __u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 16]; |
| |
| /* |
| * Generic state information |
| */ |
| __u32 utime; /* 0 Superblock update time */ |
| __u32 state; /* 1 State bits (clean, ...) */ |
| __u32 active_disks; /* 2 Number of currently active disks */ |
| __u32 working_disks; /* 3 Number of working disks */ |
| __u32 failed_disks; /* 4 Number of failed disks */ |
| __u32 spare_disks; /* 5 Number of spare disks */ |
| __u32 sb_csum; /* 6 checksum of the whole superblock */ |
| #if __BYTE_ORDER == __BIG_ENDIAN |
| __u32 events_hi; /* 7 high-order of superblock update count */ |
| __u32 events_lo; /* 8 low-order of superblock update count */ |
| __u32 cp_events_hi; /* 9 high-order of checkpoint update count */ |
| __u32 cp_events_lo; /* 10 low-order of checkpoint update count */ |
| #else |
| __u32 events_lo; /* 7 low-order of superblock update count */ |
| __u32 events_hi; /* 8 high-order of superblock update count */ |
| __u32 cp_events_lo; /* 9 low-order of checkpoint update count */ |
| __u32 cp_events_hi; /* 10 high-order of checkpoint update count */ |
| #endif |
| __u32 recovery_cp; /* 11 recovery checkpoint sector count */ |
| /* There are only valid for minor_version > 90 */ |
| __u64 reshape_position; /* 12,13 next address in array-space for reshape */ |
| __u32 new_level; /* 14 new level we are reshaping to */ |
| __u32 delta_disks; /* 15 change in number of raid_disks */ |
| __u32 new_layout; /* 16 new layout */ |
| __u32 new_chunk; /* 17 new chunk size (bytes) */ |
| __u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 18]; |
| |
| /* |
| * Personality information |
| */ |
| __u32 layout; /* 0 the array's physical layout */ |
| __u32 chunk_size; /* 1 chunk size in bytes */ |
| __u32 root_pv; /* 2 LV root PV */ |
| __u32 root_block; /* 3 LV root block */ |
| __u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 4]; |
| |
| /* |
| * Disks information |
| */ |
| mdp_disk_t disks[MD_SB_DISKS]; |
| |
| /* |
| * Reserved |
| */ |
| __u32 reserved[MD_SB_RESERVED_WORDS]; |
| |
| /* |
| * Active descriptor |
| */ |
| mdp_disk_t this_disk; |
| |
| } mdp_super_t; |
| |
| #ifdef __TINYC__ |
| typedef unsigned long long __u64; |
| #endif |
| |
| static inline __u64 md_event(mdp_super_t *sb) { |
| __u64 ev = sb->events_hi; |
| return (ev<<32)| sb->events_lo; |
| } |
| |
| struct r5l_payload_header { |
| __u16 type; |
| __u16 flags; |
| } __attribute__ ((__packed__)); |
| |
| enum r5l_payload_type { |
| R5LOG_PAYLOAD_DATA = 0, |
| R5LOG_PAYLOAD_PARITY = 1, |
| R5LOG_PAYLOAD_FLUSH = 2, |
| }; |
| |
| struct r5l_payload_data_parity { |
| struct r5l_payload_header header; |
| __u32 size; /* sector. data/parity size. each 4k has a checksum */ |
| __u64 location; /* sector. For data, it's raid sector. For |
| parity, it's stripe sector */ |
| __u32 checksum[]; |
| } __attribute__ ((__packed__)); |
| |
| enum r5l_payload_data_parity_flag { |
| R5LOG_PAYLOAD_FLAG_DISCARD = 1, /* payload is discard */ |
| /* |
| * RESHAPED/RESHAPING is only set when there is reshape activity. Note, |
| * both data/parity of a stripe should have the same flag set |
| * |
| * RESHAPED: reshape is running, and this stripe finished reshape |
| * RESHAPING: reshape is running, and this stripe isn't reshaped |
| * */ |
| R5LOG_PAYLOAD_FLAG_RESHAPED = 2, |
| R5LOG_PAYLOAD_FLAG_RESHAPING = 3, |
| }; |
| |
| struct r5l_payload_flush { |
| struct r5l_payload_header header; |
| __u32 size; /* flush_stripes size, bytes */ |
| __u64 flush_stripes[]; |
| } __attribute__ ((__packed__)); |
| |
| enum r5l_payload_flush_flag { |
| R5LOG_PAYLOAD_FLAG_FLUSH_STRIPE = 1, /* data represents whole stripe */ |
| }; |
| |
| struct r5l_meta_block { |
| __u32 magic; |
| __u32 checksum; |
| __u8 version; |
| __u8 __zero_pading_1; |
| __u16 __zero_pading_2; |
| __u32 meta_size; /* whole size of the block */ |
| |
| __u64 seq; |
| __u64 position; /* sector, start from rdev->data_offset, current position */ |
| struct r5l_payload_header payloads[]; |
| } __attribute__ ((__packed__)); |
| |
| #define R5LOG_VERSION 0x1 |
| #define R5LOG_MAGIC 0x6433c509 |
| |
| struct ppl_header_entry { |
| __u64 data_sector; /* raid sector of the new data */ |
| __u32 pp_size; /* length of partial parity */ |
| __u32 data_size; /* length of data */ |
| __u32 parity_disk; /* member disk containing parity */ |
| __u32 checksum; /* checksum of this entry's partial parity */ |
| } __attribute__ ((__packed__)); |
| |
| #define PPL_HEADER_SIZE 4096 |
| #define PPL_HDR_RESERVED 512 |
| #define PPL_HDR_ENTRY_SPACE \ |
| (PPL_HEADER_SIZE - PPL_HDR_RESERVED - 4 * sizeof(__u32) - sizeof(__u64)) |
| #define PPL_HDR_MAX_ENTRIES \ |
| (PPL_HDR_ENTRY_SPACE / sizeof(struct ppl_header_entry)) |
| |
| struct ppl_header { |
| __u8 reserved[PPL_HDR_RESERVED];/* reserved space, fill with 0xff */ |
| __u32 signature; /* signature (family number of volume) */ |
| __u32 padding; /* zero pad */ |
| __u64 generation; /* generation number of the header */ |
| __u32 entries_count; /* number of entries in entry array */ |
| __u32 checksum; /* checksum of the header */ |
| struct ppl_header_entry entries[PPL_HDR_MAX_ENTRIES]; |
| } __attribute__ ((__packed__)); |
| |
| #endif |