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