external/gpl2/lvm2/dist/lib/format1/disk-rep.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   5  * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
   6  *
   7  * This file is part of LVM2.
   8  *
   9  * This copyrighted material is made available to anyone wishing to use,
  10  * modify, copy, or redistribute it subject to the terms and conditions
  11  * of the GNU Lesser General Public License v.2.1.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #ifndef DISK_REP_FORMAT1_H
  19 #define DISK_REP_FORMAT1_H
  20
  21 #include "lvm-types.h"
  22 #include "metadata.h"
  23 #include "toolcontext.h"
  24
  25 #define MAX_PV 256
  26 #define MAX_LV 256
  27 #define MAX_VG 99
  28
  29 #define LVM_BLK_MAJOR 58
  30
  31 #define MAX_PV_SIZE     ((uint32_t) -1) /* 2TB in sectors - 1 */
  32 #define MIN_PE_SIZE     (8192L >> SECTOR_SHIFT) /* 8 KB in sectors */
  33 #define MAX_PE_SIZE     (16L * 1024L * (1024L >> SECTOR_SHIFT) * 1024L)
  34 #define PE_SIZE_PV_SIZE_REL 5   /* PV size must be at least 5 times PE size */
  35 #define MAX_LE_TOTAL    65534   /* 2^16 - 2 */
  36 #define MAX_PE_TOTAL    ((uint32_t) -2)
  37
  38 #define UNMAPPED_EXTENT 0
  39
  40 /* volume group */
  41 #define VG_ACTIVE            0x01       /* vg_status */
  42 #define VG_EXPORTED          0x02       /*     "     */
  43 #define VG_EXTENDABLE        0x04       /*     "     */
  44
  45 #define VG_READ              0x01       /* vg_access */
  46 #define VG_WRITE             0x02       /*     "     */
  47 #define VG_CLUSTERED         0x04       /*     "     */
  48 #define VG_SHARED            0x08       /*     "     */
  49
  50 /* logical volume */
  51 #define LV_ACTIVE            0x01       /* lv_status */
  52 #define LV_SPINDOWN          0x02       /*     "     */
  53 #define LV_PERSISTENT_MINOR  0x04       /*     "     */
  54
  55 #define LV_READ              0x01       /* lv_access */
  56 #define LV_WRITE             0x02       /*     "     */
  57 #define LV_SNAPSHOT          0x04       /*     "     */
  58 #define LV_SNAPSHOT_ORG      0x08       /*     "     */
  59
  60 #define LV_BADBLOCK_ON       0x01       /* lv_badblock */
  61
  62 #define LV_STRICT            0x01       /* lv_allocation */
  63 #define LV_CONTIGUOUS        0x02       /*       "       */
  64
  65 /* physical volume */
  66 #define PV_ACTIVE            0x01       /* pv_status */
  67 #define PV_ALLOCATABLE       0x02       /* pv_allocatable */
  68
  69 #define EXPORTED_TAG "PV_EXP"   /* Identifier for exported PV */
  70 #define IMPORTED_TAG "PV_IMP"   /* Identifier for imported PV */
  71
  72 struct data_area {
  73         uint32_t base;
  74         uint32_t size;
  75 } __attribute__ ((packed));
  76
  77 struct pv_disk {
  78         int8_t id[2];
  79         uint16_t version;       /* lvm version */
  80         struct data_area pv_on_disk;
  81         struct data_area vg_on_disk;
  82         struct data_area pv_uuidlist_on_disk;
  83         struct data_area lv_on_disk;
  84         struct data_area pe_on_disk;
  85         int8_t pv_uuid[NAME_LEN];
  86         int8_t vg_name[NAME_LEN];
  87         int8_t system_id[NAME_LEN];     /* for vgexport/vgimport */
  88         uint32_t pv_major;
  89         uint32_t pv_number;
  90         uint32_t pv_status;
  91         uint32_t pv_allocatable;
  92         uint32_t pv_size;
  93         uint32_t lv_cur;
  94         uint32_t pe_size;
  95         uint32_t pe_total;
  96         uint32_t pe_allocated;
  97
  98         /* only present on version == 2 pv's */
  99         uint32_t pe_start;
 100 } __attribute__ ((packed));
 101
 102 struct lv_disk {
 103         int8_t lv_name[NAME_LEN];
 104         int8_t vg_name[NAME_LEN];
 105         uint32_t lv_access;
 106         uint32_t lv_status;
 107         uint32_t lv_open;
 108         uint32_t lv_dev;
 109         uint32_t lv_number;
 110         uint32_t lv_mirror_copies;      /* for future use */
 111         uint32_t lv_recovery;   /*       "        */
 112         uint32_t lv_schedule;   /*       "        */
 113         uint32_t lv_size;
 114         uint32_t lv_snapshot_minor;     /* minor number of original */
 115         uint16_t lv_chunk_size; /* chunk size of snapshot */
 116         uint16_t dummy;
 117         uint32_t lv_allocated_le;
 118         uint32_t lv_stripes;
 119         uint32_t lv_stripesize;
 120         uint32_t lv_badblock;   /* for future use */
 121         uint32_t lv_allocation;
 122         uint32_t lv_io_timeout; /* for future use */
 123         uint32_t lv_read_ahead;
 124 } __attribute__ ((packed));
 125
 126 struct vg_disk {
 127         int8_t vg_uuid[ID_LEN]; /* volume group UUID */
 128         int8_t vg_name_dummy[NAME_LEN - ID_LEN];        /* rest of v1 VG name */
 129         uint32_t vg_number;     /* volume group number */
 130         uint32_t vg_access;     /* read/write */
 131         uint32_t vg_status;     /* active or not */
 132         uint32_t lv_max;        /* maximum logical volumes */
 133         uint32_t lv_cur;        /* current logical volumes */
 134         uint32_t lv_open;       /* open logical volumes */
 135         uint32_t pv_max;        /* maximum physical volumes */
 136         uint32_t pv_cur;        /* current physical volumes FU */
 137         uint32_t pv_act;        /* active physical volumes */
 138         uint32_t dummy;
 139         uint32_t vgda;          /* volume group descriptor arrays FU */
 140         uint32_t pe_size;       /* physical extent size in sectors */
 141         uint32_t pe_total;      /* total of physical extents */
 142         uint32_t pe_allocated;  /* allocated physical extents */
 143         uint32_t pvg_total;     /* physical volume groups FU */
 144 } __attribute__ ((packed));
 145
 146 struct pe_disk {
 147         uint16_t lv_num;
 148         uint16_t le_num;
 149 } __attribute__ ((packed));
 150
 151 struct uuid_list {
 152         struct dm_list list;
 153         char uuid[NAME_LEN] __attribute((aligned(8)));
 154 };
 155
 156 struct lvd_list {
 157         struct dm_list list;
 158         struct lv_disk lvd;
 159 };
 160
 161 struct disk_list {
 162         struct dm_list list;
 163         struct dm_pool *mem;
 164         struct device *dev;
 165
 166         struct pv_disk pvd __attribute((aligned(8)));
 167         struct vg_disk vgd __attribute((aligned(8)));
 168         struct dm_list uuids __attribute((aligned(8)));
 169         struct dm_list lvds __attribute((aligned(8)));
 170         struct pe_disk *extents __attribute((aligned(8)));
 171 };
 172
 173 /*
 174  * Layout constants.
 175  */
 176 #define METADATA_ALIGN 4096UL
 177 #define LVM1_PE_ALIGN (65536UL >> SECTOR_SHIFT)      /* PE alignment */
 178
 179 #define METADATA_BASE 0UL
 180 #define PV_SIZE 1024UL
 181 #define VG_SIZE 4096UL
 182
 183 /*
 184  * Functions to calculate layout info.
 185  */
 186 int calculate_layout(struct disk_list *dl);
 187 int calculate_extent_count(struct physical_volume *pv, uint32_t extent_size,
 188                            uint32_t max_extent_count, uint64_t pe_start);
 189
 190 /*
 191  * Low level io routines which read/write
 192  * disk_lists.
 193  */
 194
 195 struct disk_list *read_disk(const struct format_type *fmt, struct device *dev,
 196                             struct dm_pool *mem, const char *vg_name);
 197
 198 int read_pvs_in_vg(const struct format_type *fmt, const char *vg_name,
 199                    struct dev_filter *filter,
 200                    struct dm_pool *mem, struct dm_list *results);
 201
 202 int write_disks(const struct format_type *fmt, struct dm_list *pvds);
 203
 204 /*
 205  * Functions to translate to between disk and in
 206  * core structures.
 207  */
 208 int import_pv(const struct format_type *fmt, struct dm_pool *mem,
 209               struct device *dev, struct volume_group *vg,
 210               struct physical_volume *pv, struct pv_disk *pvd,
 211               struct vg_disk *vgd);
 212 int export_pv(struct cmd_context *cmd, struct dm_pool *mem,
 213               struct volume_group *vg,
 214               struct pv_disk *pvd, struct physical_volume *pv);
 215
 216 int import_vg(struct dm_pool *mem,
 217               struct volume_group *vg, struct disk_list *dl);
 218 int export_vg(struct vg_disk *vgd, struct volume_group *vg);
 219
 220 int import_lv(struct cmd_context *cmd, struct dm_pool *mem,
 221               struct logical_volume *lv, struct lv_disk *lvd);
 222
 223 int import_extents(struct cmd_context *cmd, struct volume_group *vg,
 224                    struct dm_list *pvds);
 225 int export_extents(struct disk_list *dl, uint32_t lv_num,
 226                    struct logical_volume *lv, struct physical_volume *pv);
 227
 228 int import_pvs(const struct format_type *fmt, struct dm_pool *mem,
 229                struct volume_group *vg,
 230                struct dm_list *pvds, struct dm_list *results, uint32_t *count);
 231
 232 int import_lvs(struct dm_pool *mem, struct volume_group *vg, struct dm_list *pvds);
 233 int export_lvs(struct disk_list *dl, struct volume_group *vg,
 234                struct physical_volume *pv, const char *dev_dir);
 235
 236 int import_snapshots(struct dm_pool *mem, struct volume_group *vg,
 237                      struct dm_list *pvds);
 238
 239 int export_uuids(struct disk_list *dl, struct volume_group *vg);
 240
 241 void export_numbers(struct dm_list *pvds, struct volume_group *vg);
 242
 243 void export_pv_act(struct dm_list *pvds);
 244 int munge_pvd(struct device *dev, struct pv_disk *pvd);
 245 int read_vgd(struct device *dev, struct vg_disk *vgd, struct pv_disk *pvd);
 246
 247 /* blech */
 248 int get_free_vg_number(struct format_instance *fid, struct dev_filter *filter,
 249                        const char *candidate_vg, int *result);
 250 int export_vg_number(struct format_instance *fid, struct dm_list *pvds,
 251                      const char *vg_name, struct dev_filter *filter);
 252
 253 #endif