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+/*
+ 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>
+
+/*
+ * 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_WRITEMOSTLY 9 /* disk is "write-mostly" is RAID1 config.
+ * read requests will only be sent here in
+ * dire need
+ */
+
+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_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 */
+#ifdef __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;
+
+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;
+ __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.
+ */
+
+ /* 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 */
+ __le64 recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
+ __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 one defined...*/
+#define WriteMostly1 1 /* mask for writemostly flag in above */
+ /* 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_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 \
+ )
+
+#endif