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/* lvm.h - On disk structures for LVM. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GRUB_LVM_H
#define GRUB_LVM_H 1
#include <grub/types.h>
/* Length of ID string, excluding terminating zero. */
#define GRUB_LVM_ID_STRLEN 38
struct grub_lvm_vg {
char id[GRUB_LVM_ID_STRLEN+1];
char *name;
int extent_size;
struct grub_lvm_pv *pvs;
struct grub_lvm_lv *lvs;
struct grub_lvm_vg *next;
};
struct grub_lvm_pv {
char id[GRUB_LVM_ID_STRLEN+1];
char *name;
grub_disk_t disk;
int start; /* Sector number where the data area starts. */
struct grub_lvm_pv *next;
};
struct grub_lvm_lv {
char *name;
unsigned int number;
unsigned int segment_count;
grub_uint64_t size;
int visible;
struct grub_lvm_segment *segments; /* Pointer to segment_count segments. */
struct grub_lvm_vg *vg;
struct grub_lvm_lv *next;
};
struct grub_lvm_segment {
unsigned int start_extent;
unsigned int extent_count;
enum { GRUB_LVM_STRIPED, GRUB_LVM_MIRROR } type;
unsigned int node_count;
struct grub_lvm_node *nodes;
unsigned int stripe_size;
};
struct grub_lvm_node {
grub_disk_addr_t start;
char *name;
struct grub_lvm_pv *pv;
struct grub_lvm_lv *lv;
};
#define GRUB_LVM_LABEL_SIZE GRUB_DISK_SECTOR_SIZE
#define GRUB_LVM_LABEL_SCAN_SECTORS 4L
#define GRUB_LVM_LABEL_ID "LABELONE"
#define GRUB_LVM_LVM2_LABEL "LVM2 001"
#define GRUB_LVM_ID_LEN 32
/* On disk - 32 bytes */
struct grub_lvm_label_header {
grub_int8_t id[8]; /* LABELONE */
grub_uint64_t sector_xl; /* Sector number of this label */
grub_uint32_t crc_xl; /* From next field to end of sector */
grub_uint32_t offset_xl; /* Offset from start of struct to contents */
grub_int8_t type[8]; /* LVM2 001 */
} __attribute__ ((packed));
/* On disk */
struct grub_lvm_disk_locn {
grub_uint64_t offset; /* Offset in bytes to start sector */
grub_uint64_t size; /* Bytes */
} __attribute__ ((packed));
/* Fields with the suffix _xl should be xlate'd wherever they appear */
/* On disk */
struct grub_lvm_pv_header {
grub_int8_t pv_uuid[GRUB_LVM_ID_LEN];
/* This size can be overridden if PV belongs to a VG */
grub_uint64_t device_size_xl; /* Bytes */
/* NULL-terminated list of data areas followed by */
/* NULL-terminated list of metadata area headers */
struct grub_lvm_disk_locn disk_areas_xl[0]; /* Two lists */
} __attribute__ ((packed));
#define GRUB_LVM_FMTT_MAGIC "\040\114\126\115\062\040\170\133\065\101\045\162\060\116\052\076"
#define GRUB_LVM_FMTT_VERSION 1
#define GRUB_LVM_MDA_HEADER_SIZE 512
/* On disk */
struct grub_lvm_raw_locn {
grub_uint64_t offset; /* Offset in bytes to start sector */
grub_uint64_t size; /* Bytes */
grub_uint32_t checksum;
grub_uint32_t filler;
} __attribute__ ((packed));
/* On disk */
/* Structure size limited to one sector */
struct grub_lvm_mda_header {
grub_uint32_t checksum_xl; /* Checksum of rest of mda_header */
grub_int8_t magic[16]; /* To aid scans for metadata */
grub_uint32_t version;
grub_uint64_t start; /* Absolute start byte of mda_header */
grub_uint64_t size; /* Size of metadata area */
struct grub_lvm_raw_locn raw_locns[0]; /* NULL-terminated list */
} __attribute__ ((packed));
#endif /* ! GRUB_LVM_H */
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