/* 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. */ #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 … #define MD_RESERVED_SECTORS … #define MD_NEW_SIZE_SECTORS(x) … #define MD_SB_BYTES … #define MD_SB_WORDS … #define MD_SB_SECTORS … /* * The following are counted in 32-bit words */ #define MD_SB_GENERIC_OFFSET … #define MD_SB_PERSONALITY_OFFSET … #define MD_SB_DISKS_OFFSET … #define MD_SB_DESCRIPTOR_OFFSET … #define MD_SB_GENERIC_CONSTANT_WORDS … #define MD_SB_GENERIC_STATE_WORDS … #define MD_SB_GENERIC_WORDS … #define MD_SB_PERSONALITY_WORDS … #define MD_SB_DESCRIPTOR_WORDS … #define MD_SB_DISKS … #define MD_SB_DISKS_WORDS … #define MD_SB_RESERVED_WORDS … #define MD_SB_EQUAL_WORDS … /* * Device "operational" state bits */ #define MD_DISK_FAULTY … #define MD_DISK_ACTIVE … #define MD_DISK_SYNC … #define MD_DISK_REMOVED … #define MD_DISK_CLUSTER_ADD … #define MD_DISK_CANDIDATE … #define MD_DISK_FAILFAST … #define MD_DISK_WRITEMOSTLY … #define MD_DISK_JOURNAL … #define MD_DISK_ROLE_SPARE … #define MD_DISK_ROLE_FAULTY … #define MD_DISK_ROLE_JOURNAL … #define MD_DISK_ROLE_MAX … mdp_disk_t; #define MD_SB_MAGIC … /* * Superblock state bits */ #define MD_SB_CLEAN … #define MD_SB_ERRORS … #define MD_SB_CLUSTERED … #define MD_SB_BITMAP_PRESENT … /* * Notes: * - if an array is being reshaped (restriped) in order to change * 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. */ mdp_super_t; static inline __u64 md_event(mdp_super_t *sb) { … } #define MD_SUPERBLOCK_1_TIME_SEC_MASK … /* * 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 { … }; /* feature_map bits */ #define MD_FEATURE_BITMAP_OFFSET … #define MD_FEATURE_RECOVERY_OFFSET … #define MD_FEATURE_RESHAPE_ACTIVE … #define MD_FEATURE_BAD_BLOCKS … #define MD_FEATURE_REPLACEMENT … #define MD_FEATURE_RESHAPE_BACKWARDS … #define MD_FEATURE_NEW_OFFSET … #define MD_FEATURE_RECOVERY_BITMAP … #define MD_FEATURE_CLUSTERED … #define MD_FEATURE_JOURNAL … #define MD_FEATURE_PPL … #define MD_FEATURE_MULTIPLE_PPLS … #define MD_FEATURE_RAID0_LAYOUT … #define MD_FEATURE_ALL … struct r5l_payload_header { … } __attribute__ ((packed)); enum r5l_payload_type { … }; struct r5l_payload_data_parity { … } __attribute__ ((packed)); enum r5l_payload_data_parity_flag { … }; struct r5l_payload_flush { … } __attribute__ ((packed)); enum r5l_payload_flush_flag { … }; struct r5l_meta_block { … } __attribute__ ((packed)); #define R5LOG_VERSION … #define R5LOG_MAGIC … struct ppl_header_entry { … } __attribute__ ((packed)); #define PPL_HEADER_SIZE … #define PPL_HDR_RESERVED … #define PPL_HDR_ENTRY_SPACE … #define PPL_HDR_MAX_ENTRIES … struct ppl_header { … } __attribute__ ((packed)); #endif
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