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md_p.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ /* 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 #include <linux/types.h> #include <asm/byteorder.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_NEW_SIZE_SECTORS(x) ((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS) #define MD_SB_BYTES 4096 #define MD_SB_WORDS (MD_SB_BYTES / 4) #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 or spare disk */ #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_FAILFAST 10 /* Send REQ_FAILFAST if there are multiple * devices available - and don't try to * correct read errors. */ #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_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_CLUSTERED 5 /* MD is clustered */ #define MD_SB_BITMAP_PRESENT 8 /* bitmap may be present nearby */ /* * Notes: * - if an array is being reshaped (restriped) in order to change the * the number of active devices in the array, 'raid_disks' will be * the larger of the old and new numbers. 'delta_disks' will * be the "new - old". So if +ve, raid_disks is the new value, and * "raid_disks-delta_disks" is the old. If -ve, raid_disks is the * old value and "raid_disks+delta_disks" is the new (smaller) value. */ 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 defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__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 */ #elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN) __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 */ #else #error unspecified endianness #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; static __inline__ __u64 md_event(mdp_super_t *sb) { __u64 ev = sb->events_hi; return (ev<<32)| sb->events_lo; } #define MD_SUPERBLOCK_1_TIME_SEC_MASK ((1ULL<<40) - 1) /* * The version-1 superblock : * All numeric fields are little-endian. * * total size: 256 bytes plus 2 per device. * 1K allows 384 devices. */ struct mdp_superblock_1 { /* constant array information - 128 bytes */ __le32 magic; /* MD_SB_MAGIC: 0xa92b4efc - little endian */ __le32 major_version; /* 1 */ __le32 feature_map; /* bit 0 set if 'bitmap_offset' is meaningful */ __le32 pad0; /* always set to 0 when writing */ __u8 set_uuid[16]; /* user-space generated. */ 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; /* -4 (multipath), -1 (linear), 0,1,4,5 */ __le32 layout; /* only for raid5 and raid10 currently */ __le64 size; /* used size of component devices, in 512byte sectors */ __le32 chunksize; /* in 512byte sectors */ __le32 raid_disks; union { __le32 bitmap_offset; /* sectors after start of superblock that bitmap starts * NOTE: signed, so bitmap can be before superblock * only meaningful of feature_map[0] is set. */ /* only meaningful when feature_map[MD_FEATURE_PPL] is set */ struct { __le16 offset; /* sectors from start of superblock that ppl starts (signed) */ __le16 size; /* ppl size in sectors */ } ppl; }; /* These are only valid with feature bit '4' */ __le32 new_level; /* new level we are reshaping to */ __le64 reshape_position; /* next address in array-space for reshape */ __le32 delta_disks; /* change in number of raid_disks */ __le32 new_layout; /* new layout */ __le32 new_chunk; /* new chunk size (512byte sectors) */ __le32 new_offset; /* signed number to add to data_offset in new * layout. 0 == no-change. This can be * different on each device in the array. */ /* constant this-device information - 64 bytes */ __le64 data_offset; /* sector start of data, often 0 */ __le64 data_size; /* sectors in this device that can be used for data */ __le64 super_offset; /* sector start of this superblock */ union { __le64 recovery_offset;/* sectors before this offset (from data_offset) have been recovered */ __le64 journal_tail;/* journal tail of journal device (from data_offset) */ }; __le32 dev_number; /* permanent identifier of this device - not role in raid */ __le32 cnt_corrected_read; /* number of read errors that were corrected by re-writing */ __u8 device_uuid[16]; /* user-space setable, ignored by kernel */ __u8 devflags; /* per-device flags. Only two defined...*/ #define WriteMostly1 1 /* mask for writemostly flag in above */ #define FailFast1 2 /* Should avoid retries and fixups and just fail */ /* Bad block log. If there are any bad blocks the feature flag is set. * If offset and size are non-zero, that space is reserved and available */ __u8 bblog_shift; /* shift from sectors to block size */ __le16 bblog_size; /* number of sectors reserved for list */ __le32 bblog_offset; /* sector offset from superblock to bblog, * signed - not unsigned */ /* array state information - 64 bytes */ __le64 utime; /* 40 bits second, 24 bits microseconds */ __le64 events; /* incremented when superblock updated */ __le64 resync_offset; /* data before this offset (from data_offset) known to be in sync */ __le32 sb_csum; /* checksum up to devs[max_dev] */ __le32 max_dev; /* size of devs[] array to consider */ __u8 pad3[64-32]; /* set to 0 when writing */ /* device state information. Indexed by dev_number. * 2 bytes per device * Note there are no per-device state flags. State information is rolled * into the 'roles' value. If a device is spare or faulty, then it doesn't * have a meaningful role. */ __le16 dev_roles[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */ }; /* feature_map bits */ #define MD_FEATURE_BITMAP_OFFSET 1 #define MD_FEATURE_RECOVERY_OFFSET 2 /* recovery_offset is present and * must be honoured */ #define MD_FEATURE_RESHAPE_ACTIVE 4 #define MD_FEATURE_BAD_BLOCKS 8 /* badblock list is not empty */ #define MD_FEATURE_REPLACEMENT 16 /* This device is replacing an * active device with same 'role'. * 'recovery_offset' is also set. */ #define MD_FEATURE_RESHAPE_BACKWARDS 32 /* Reshape doesn't change number * of devices, but is going * backwards anyway. */ #define MD_FEATURE_NEW_OFFSET 64 /* new_offset must be honoured */ #define MD_FEATURE_RECOVERY_BITMAP 128 /* recovery that is happening * is guided by bitmap. */ #define MD_FEATURE_CLUSTERED 256 /* clustered MD */ #define MD_FEATURE_JOURNAL 512 /* support write cache */ #define MD_FEATURE_PPL 1024 /* support PPL */ #define MD_FEATURE_MULTIPLE_PPLS 2048 /* support for multiple PPLs */ #define MD_FEATURE_RAID0_LAYOUT 4096 /* layout is meaningful for RAID0 */ #define MD_FEATURE_ALL (MD_FEATURE_BITMAP_OFFSET \ |MD_FEATURE_RECOVERY_OFFSET \ |MD_FEATURE_RESHAPE_ACTIVE \ |MD_FEATURE_BAD_BLOCKS \ |MD_FEATURE_REPLACEMENT \ |MD_FEATURE_RESHAPE_BACKWARDS \ |MD_FEATURE_NEW_OFFSET \ |MD_FEATURE_RECOVERY_BITMAP \ |MD_FEATURE_CLUSTERED \ |MD_FEATURE_JOURNAL \ |MD_FEATURE_PPL \ |MD_FEATURE_MULTIPLE_PPLS \ |MD_FEATURE_RAID0_LAYOUT \ ) struct r5l_payload_header { __le16 type; __le16 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; __le32 size; /* sector. data/parity size. each 4k * has a checksum */ __le64 location; /* sector. For data, it's raid sector. For * parity, it's stripe sector */ __le32 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; __le32 size; /* flush_stripes size, bytes */ __le64 flush_stripes[]; } __attribute__ ((__packed__)); enum r5l_payload_flush_flag { R5LOG_PAYLOAD_FLAG_FLUSH_STRIPE = 1, /* data represents whole stripe */ }; struct r5l_meta_block { __le32 magic; __le32 checksum; __u8 version; __u8 __zero_pading_1; __le16 __zero_pading_2; __le32 meta_size; /* whole size of the block */ __le64 seq; __le64 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 { __le64 data_sector; /* raid sector of the new data */ __le32 pp_size; /* length of partial parity */ __le32 data_size; /* length of data */ __le32 parity_disk; /* member disk containing parity */ __le32 checksum; /* checksum of partial parity data for this * entry (~crc32c) */ } __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(__le32) - sizeof(__le64)) #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 */ __le32 signature; /* signature (family number of volume) */ __le32 padding; /* zero pad */ __le64 generation; /* generation number of the header */ __le32 entries_count; /* number of entries in entry array */ __le32 checksum; /* checksum of the header (~crc32c) */ struct ppl_header_entry entries[PPL_HDR_MAX_ENTRIES]; } __attribute__ ((__packed__)); #endif