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Diffstat (limited to 'include/grub/lvm.h')
| -rw-r--r-- | include/grub/lvm.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/include/grub/lvm.h b/include/grub/lvm.h new file mode 100644 index 0000000..b962dfd --- /dev/null +++ b/include/grub/lvm.h @@ -0,0 +1,137 @@ +/* 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 */ |