| | 1 | /* |
| | 2 | * mdadm - manage Linux "md" devices aka RAID arrays. |
| | 3 | * |
| | 4 | * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de> |
| | 5 | * |
| | 6 | * |
| | 7 | * This program is free software; you can redistribute it and/or modify |
| | 8 | * it under the terms of the GNU General Public License as published by |
| | 9 | * the Free Software Foundation; either version 2 of the License, or |
| | 10 | * (at your option) any later version. |
| | 11 | * |
| | 12 | * This program is distributed in the hope that it will be useful, |
| | 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| | 15 | * GNU General Public License for more details. |
| | 16 | * |
| | 17 | * You should have received a copy of the GNU General Public License |
| | 18 | * along with this program; if not, write to the Free Software |
| | 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| | 20 | * |
| | 21 | * Author: Neil Brown |
| | 22 | * Email: <neilb@suse.de> |
| | 23 | */ |
| | 24 | |
| | 25 | #define _GNU_SOURCE |
| | 26 | #define _FILE_OFFSET_BITS 64 |
| | 27 | #include <unistd.h> |
| | 28 | #if !defined(__dietlibc__) && !defined(__KLIBC__) |
| | 29 | extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence)); |
| | 30 | #else |
| | 31 | # if defined(__NO_STAT64) || __WORDSIZE != 32 |
| | 32 | # define lseek64 lseek |
| | 33 | # endif |
| | 34 | #endif |
| | 35 | |
| | 36 | #include <sys/types.h> |
| | 37 | #include <sys/stat.h> |
| | 38 | #include <stdlib.h> |
| | 39 | #include <time.h> |
| | 40 | #include <sys/time.h> |
| | 41 | #include <getopt.h> |
| | 42 | #include <fcntl.h> |
| | 43 | #include <stdio.h> |
| | 44 | #include <errno.h> |
| | 45 | #include <string.h> |
| | 46 | #include <syslog.h> |
| | 47 | #ifdef __dietlibc__ |
| | 48 | #include <strings.h> |
| | 49 | /* dietlibc has deprecated random and srandom!! */ |
| | 50 | #define random rand |
| | 51 | #define srandom srand |
| | 52 | #endif |
| | 53 | |
| | 54 | |
| | 55 | #include <linux/kdev_t.h> |
| | 56 | /*#include <linux/fs.h> */ |
| | 57 | #include <sys/mount.h> |
| | 58 | #include <asm/types.h> |
| | 59 | #include <sys/ioctl.h> |
| | 60 | #define MD_MAJOR 9 |
| | 61 | #define MdpMinorShift 6 |
| | 62 | |
| | 63 | #ifndef BLKGETSIZE64 |
| | 64 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ |
| | 65 | #endif |
| | 66 | |
| | 67 | #define DEFAULT_BITMAP_CHUNK 4096 |
| | 68 | #define DEFAULT_BITMAP_DELAY 5 |
| | 69 | #define DEFAULT_MAX_WRITE_BEHIND 256 |
| | 70 | |
| | 71 | #include "md_u.h" |
| | 72 | #include "md_p.h" |
| | 73 | #include "bitmap.h" |
| | 74 | #include "msg.h" |
| | 75 | |
| | 76 | #include <endian.h> |
| | 77 | /* Redhat don't like to #include <asm/byteorder.h>, and |
| | 78 | * some time include <linux/byteorder/xxx_endian.h> isn't enough, |
| | 79 | * and there is no standard conversion function so... */ |
| | 80 | /* And dietlibc doesn't think byteswap is ok, so.. */ |
| | 81 | /* #include <byteswap.h> */ |
| | 82 | #define bswap_16(x) (((x) & 0x00ffU) << 8 | \ |
| | 83 | ((x) & 0xff00U) >> 8) |
| | 84 | #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \ |
| | 85 | ((x) & 0xff000000U) >> 24 | \ |
| | 86 | ((x) & 0x0000ff00U) << 8 | \ |
| | 87 | ((x) & 0x00ff0000U) >> 8) |
| | 88 | #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \ |
| | 89 | ((x) & 0xff00000000000000ULL) >> 56 | \ |
| | 90 | ((x) & 0x000000000000ff00ULL) << 40 | \ |
| | 91 | ((x) & 0x00ff000000000000ULL) >> 40 | \ |
| | 92 | ((x) & 0x0000000000ff0000ULL) << 24 | \ |
| | 93 | ((x) & 0x0000ff0000000000ULL) >> 24 | \ |
| | 94 | ((x) & 0x00000000ff000000ULL) << 8 | \ |
| | 95 | ((x) & 0x000000ff00000000ULL) >> 8) |
| | 96 | |
| | 97 | #if !defined(__KLIBC__) |
| | 98 | #if BYTE_ORDER == LITTLE_ENDIAN |
| | 99 | #define __cpu_to_le16(_x) (_x) |
| | 100 | #define __cpu_to_le32(_x) (_x) |
| | 101 | #define __cpu_to_le64(_x) (_x) |
| | 102 | #define __le16_to_cpu(_x) (_x) |
| | 103 | #define __le32_to_cpu(_x) (_x) |
| | 104 | #define __le64_to_cpu(_x) (_x) |
| | 105 | |
| | 106 | #define __cpu_to_be16(_x) bswap_16(_x) |
| | 107 | #define __cpu_to_be32(_x) bswap_32(_x) |
| | 108 | #define __cpu_to_be64(_x) bswap_64(_x) |
| | 109 | #define __be16_to_cpu(_x) bswap_16(_x) |
| | 110 | #define __be32_to_cpu(_x) bswap_32(_x) |
| | 111 | #define __be64_to_cpu(_x) bswap_64(_x) |
| | 112 | #elif BYTE_ORDER == BIG_ENDIAN |
| | 113 | #define __cpu_to_le16(_x) bswap_16(_x) |
| | 114 | #define __cpu_to_le32(_x) bswap_32(_x) |
| | 115 | #define __cpu_to_le64(_x) bswap_64(_x) |
| | 116 | #define __le16_to_cpu(_x) bswap_16(_x) |
| | 117 | #define __le32_to_cpu(_x) bswap_32(_x) |
| | 118 | #define __le64_to_cpu(_x) bswap_64(_x) |
| | 119 | |
| | 120 | #define __cpu_to_be16(_x) (_x) |
| | 121 | #define __cpu_to_be32(_x) (_x) |
| | 122 | #define __cpu_to_be64(_x) (_x) |
| | 123 | #define __be16_to_cpu(_x) (_x) |
| | 124 | #define __be32_to_cpu(_x) (_x) |
| | 125 | #define __be64_to_cpu(_x) (_x) |
| | 126 | #else |
| | 127 | # error "unknown endianness." |
| | 128 | #endif |
| | 129 | #endif /* __KLIBC__ */ |
| | 130 | |
| | 131 | |
| | 132 | |
| | 133 | /* general information that might be extracted from a superblock */ |
| | 134 | struct mdinfo { |
| | 135 | mdu_array_info_t array; |
| | 136 | mdu_disk_info_t disk; |
| | 137 | __u64 events; |
| | 138 | int uuid[4]; |
| | 139 | char name[33]; |
| | 140 | unsigned long long data_offset; |
| | 141 | unsigned long long component_size; /* same as array.size, except in |
| | 142 | * sectors and up to 64bits. |
| | 143 | */ |
| | 144 | unsigned long long custom_array_size; /* size for non-default sized |
| | 145 | * arrays (in sectors) |
| | 146 | */ |
| | 147 | int reshape_active; |
| | 148 | unsigned long long reshape_progress; |
| | 149 | union { |
| | 150 | unsigned long long resync_start; /* per-array resync position */ |
| | 151 | unsigned long long recovery_start; /* per-device rebuild position */ |
| | 152 | #define MaxSector (~0ULL) /* resync/recovery complete position */ |
| | 153 | }; |
| | 154 | unsigned long safe_mode_delay; /* ms delay to mark clean */ |
| | 155 | int new_level, delta_disks, new_layout, new_chunk; |
| | 156 | int errors; |
| | 157 | int cache_size; /* size of raid456 stripe cache*/ |
| | 158 | int mismatch_cnt; |
| | 159 | char text_version[50]; |
| | 160 | void *update_private; /* for passing metadata-format |
| | 161 | * specific update data |
| | 162 | * between successive calls to |
| | 163 | * update_super() |
| | 164 | */ |
| | 165 | |
| | 166 | int container_member; /* for assembling external-metatdata arrays |
| | 167 | * This is to be used internally by metadata |
| | 168 | * handler only */ |
| | 169 | |
| | 170 | char sys_name[20]; |
| | 171 | struct mdinfo *devs; |
| | 172 | struct mdinfo *next; |
| | 173 | |
| | 174 | /* Device info for mdmon: */ |
| | 175 | int recovery_fd; |
| | 176 | int state_fd; |
| | 177 | #define DS_FAULTY 1 |
| | 178 | #define DS_INSYNC 2 |
| | 179 | #define DS_WRITE_MOSTLY 4 |
| | 180 | #define DS_SPARE 8 |
| | 181 | #define DS_BLOCKED 16 |
| | 182 | #define DS_REMOVE 1024 |
| | 183 | #define DS_UNBLOCK 2048 |
| | 184 | int prev_state, curr_state, next_state; |
| | 185 | |
| | 186 | }; |
| | 187 | |
| | 188 | struct createinfo { |
| | 189 | int uid; |
| | 190 | int gid; |
| | 191 | int autof; |
| | 192 | int mode; |
| | 193 | int symlinks; |
| | 194 | struct supertype *supertype; |
| | 195 | }; |
| | 196 | |
| | 197 | #define Name "mdadm" |
| | 198 | |
| | 199 | enum mode { |
| | 200 | ASSEMBLE=1, |
| | 201 | BUILD, |
| | 202 | CREATE, |
| | 203 | MANAGE, |
| | 204 | MISC, |
| | 205 | MONITOR, |
| | 206 | GROW, |
| | 207 | INCREMENTAL, |
| | 208 | AUTODETECT, |
| | 209 | }; |
| | 210 | |
| | 211 | extern char short_options[]; |
| | 212 | extern char short_bitmap_options[]; |
| | 213 | extern char short_bitmap_auto_options[]; |
| | 214 | extern struct option long_options[]; |
| | 215 | extern char Version[], Usage[], Help[], OptionHelp[], |
| | 216 | Help_create[], Help_build[], Help_assemble[], Help_grow[], |
| | 217 | Help_incr[], |
| | 218 | Help_manage[], Help_misc[], Help_monitor[], Help_config[]; |
| | 219 | |
| | 220 | /* for option that don't have short equivilents, we assign arbitrary |
| | 221 | * small numbers. '1' means an undecorated option, so we start at '2'. |
| | 222 | */ |
| | 223 | enum special_options { |
| | 224 | AssumeClean = 2, |
| | 225 | BitmapChunk, |
| | 226 | WriteBehind, |
| | 227 | ReAdd, |
| | 228 | NoDegraded, |
| | 229 | Sparc22, |
| | 230 | BackupFile, |
| | 231 | HomeHost, |
| | 232 | AutoHomeHost, |
| | 233 | Symlinks, |
| | 234 | AutoDetect, |
| | 235 | Waitclean, |
| | 236 | DetailPlatform, |
| | 237 | }; |
| | 238 | |
| | 239 | /* structures read from config file */ |
| | 240 | /* List of mddevice names and identifiers |
| | 241 | * Identifiers can be: |
| | 242 | * uuid=128-hex-uuid |
| | 243 | * super-minor=decimal-minor-number-from-superblock |
| | 244 | * devices=comma,separated,list,of,device,names,with,wildcards |
| | 245 | * |
| | 246 | * If multiple fields are present, the intersection of all matching |
| | 247 | * devices is considered |
| | 248 | */ |
| | 249 | #define UnSet (0xfffe) |
| | 250 | typedef struct mddev_ident_s { |
| | 251 | char *devname; |
| | 252 | |
| | 253 | int uuid_set; |
| | 254 | int uuid[4]; |
| | 255 | char name[33]; |
| | 256 | |
| | 257 | unsigned int super_minor; |
| | 258 | |
| | 259 | char *devices; /* comma separated list of device |
| | 260 | * names with wild cards |
| | 261 | */ |
| | 262 | int level; |
| | 263 | unsigned int raid_disks; |
| | 264 | unsigned int spare_disks; |
| | 265 | struct supertype *st; |
| | 266 | int autof; /* 1 for normal, 2 for partitioned */ |
| | 267 | char *spare_group; |
| | 268 | char *bitmap_file; |
| | 269 | int bitmap_fd; |
| | 270 | |
| | 271 | char *container; /* /dev/whatever name of container, or |
| | 272 | * uuid of container. You would expect |
| | 273 | * this to be the 'devname' or UUID |
| | 274 | * of some other entry. |
| | 275 | */ |
| | 276 | char *member; /* subarray within a container */ |
| | 277 | |
| | 278 | struct mddev_ident_s *next; |
| | 279 | } *mddev_ident_t; |
| | 280 | |
| | 281 | /* List of device names - wildcards expanded */ |
| | 282 | typedef struct mddev_dev_s { |
| | 283 | char *devname; |
| | 284 | char disposition; /* 'a' for add, 'r' for remove, 'f' for fail. |
| | 285 | * Not set for names read from .config |
| | 286 | */ |
| | 287 | char writemostly; /* 1 for 'set writemostly', 2 for 'clear writemostly' */ |
| | 288 | char re_add; |
| | 289 | char used; /* set when used */ |
| | 290 | struct mdinfo *content; /* If devname is a container, this might list |
| | 291 | * the remaining member arrays. */ |
| | 292 | struct mddev_dev_s *next; |
| | 293 | } *mddev_dev_t; |
| | 294 | |
| | 295 | typedef struct mapping { |
| | 296 | char *name; |
| | 297 | int num; |
| | 298 | } mapping_t; |
| | 299 | |
| | 300 | |
| | 301 | struct mdstat_ent { |
| | 302 | char *dev; |
| | 303 | int devnum; |
| | 304 | int active; |
| | 305 | char *level; |
| | 306 | char *pattern; /* U or up, _ for down */ |
| | 307 | int percent; /* -1 if no resync */ |
| | 308 | int resync; /* 1 if resync, 0 if recovery */ |
| | 309 | int devcnt; |
| | 310 | int raid_disks; |
| | 311 | int chunk_size; |
| | 312 | char * metadata_version; |
| | 313 | struct mdstat_ent *next; |
| | 314 | }; |
| | 315 | |
| | 316 | extern struct mdstat_ent *mdstat_read(int hold, int start); |
| | 317 | extern void free_mdstat(struct mdstat_ent *ms); |
| | 318 | extern void mdstat_wait(int seconds); |
| | 319 | extern void mdstat_wait_fd(int fd, const sigset_t *sigmask); |
| | 320 | extern int mddev_busy(int devnum); |
| | 321 | |
| | 322 | struct map_ent { |
| | 323 | struct map_ent *next; |
| | 324 | int devnum; |
| | 325 | char metadata[20]; |
| | 326 | int uuid[4]; |
| | 327 | int bad; |
| | 328 | char *path; |
| | 329 | }; |
| | 330 | extern int map_update(struct map_ent **mpp, int devnum, char *metadata, |
| | 331 | int uuid[4], char *path); |
| | 332 | extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]); |
| | 333 | extern struct map_ent *map_by_devnum(struct map_ent **map, int devnum); |
| | 334 | extern struct map_ent *map_by_name(struct map_ent **map, char *name); |
| | 335 | extern void map_read(struct map_ent **melp); |
| | 336 | extern int map_write(struct map_ent *mel); |
| | 337 | extern void map_delete(struct map_ent **mapp, int devnum); |
| | 338 | extern void map_free(struct map_ent *map); |
| | 339 | extern void map_add(struct map_ent **melp, |
| | 340 | int devnum, char *metadata, int uuid[4], char *path); |
| | 341 | extern int map_lock(struct map_ent **melp); |
| | 342 | extern void map_unlock(struct map_ent **melp); |
| | 343 | |
| | 344 | /* various details can be requested */ |
| | 345 | enum sysfs_read_flags { |
| | 346 | GET_LEVEL = (1 << 0), |
| | 347 | GET_LAYOUT = (1 << 1), |
| | 348 | GET_COMPONENT = (1 << 2), |
| | 349 | GET_CHUNK = (1 << 3), |
| | 350 | GET_CACHE = (1 << 4), |
| | 351 | GET_MISMATCH = (1 << 5), |
| | 352 | GET_VERSION = (1 << 6), |
| | 353 | GET_DISKS = (1 << 7), |
| | 354 | GET_DEGRADED = (1 << 8), |
| | 355 | GET_SAFEMODE = (1 << 9), |
| | 356 | GET_DEVS = (1 << 10), /* gets role, major, minor */ |
| | 357 | GET_OFFSET = (1 << 11), |
| | 358 | GET_SIZE = (1 << 12), |
| | 359 | GET_STATE = (1 << 13), |
| | 360 | GET_ERROR = (1 << 14), |
| | 361 | SKIP_GONE_DEVS = (1 << 15), |
| | 362 | }; |
| | 363 | |
| | 364 | /* If fd >= 0, get the array it is open on, |
| | 365 | * else use devnum. >=0 -> major9. <0..... |
| | 366 | */ |
| | 367 | extern int sysfs_open(int devnum, char *devname, char *attr); |
| | 368 | extern void sysfs_init(struct mdinfo *mdi, int fd, int devnum); |
| | 369 | extern void sysfs_free(struct mdinfo *sra); |
| | 370 | extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options); |
| | 371 | extern int sysfs_attr_match(const char *attr, const char *str); |
| | 372 | extern int sysfs_match_word(const char *word, char **list); |
| | 373 | extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, |
| | 374 | char *name, char *val); |
| | 375 | extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, |
| | 376 | char *name, unsigned long long val); |
| | 377 | extern int sysfs_uevent(struct mdinfo *sra, char *event); |
| | 378 | extern int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, |
| | 379 | char *name); |
| | 380 | extern int sysfs_fd_get_ll(int fd, unsigned long long *val); |
| | 381 | extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, |
| | 382 | char *name, unsigned long long *val); |
| | 383 | extern int sysfs_fd_get_str(int fd, char *val, int size); |
| | 384 | extern int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev, |
| | 385 | char *name, char *val, int size); |
| | 386 | extern int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms); |
| | 387 | extern int sysfs_set_array(struct mdinfo *info, int vers); |
| | 388 | extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume); |
| | 389 | extern int sysfs_disk_to_scsi_id(int fd, __u32 *id); |
| | 390 | extern int sysfs_unique_holder(int devnum, long rdev); |
| | 391 | extern int load_sys(char *path, char *buf); |
| | 392 | |
| | 393 | |
| | 394 | extern int save_stripes(int *source, unsigned long long *offsets, |
| | 395 | int raid_disks, int chunk_size, int level, int layout, |
| | 396 | int nwrites, int *dest, |
| | 397 | unsigned long long start, unsigned long long length, |
| | 398 | char *buf); |
| | 399 | extern int restore_stripes(int *dest, unsigned long long *offsets, |
| | 400 | int raid_disks, int chunk_size, int level, int layout, |
| | 401 | int source, unsigned long long read_offset, |
| | 402 | unsigned long long start, unsigned long long length); |
| | 403 | |
| | 404 | #ifndef Sendmail |
| | 405 | #define Sendmail "/usr/lib/sendmail -t" |
| | 406 | #endif |
| | 407 | |
| | 408 | #define SYSLOG_FACILITY LOG_DAEMON |
| | 409 | |
| | 410 | extern char *map_num(mapping_t *map, int num); |
| | 411 | extern int map_name(mapping_t *map, char *name); |
| | 412 | extern mapping_t r5layout[], r6layout[], pers[], modes[], faultylayout[]; |
| | 413 | |
| | 414 | extern char *map_dev(int major, int minor, int create); |
| | 415 | |
| | 416 | struct active_array; |
| | 417 | struct metadata_update; |
| | 418 | |
| | 419 | /* A superswitch provides entry point the a metadata handler. |
| | 420 | * |
| | 421 | * The super_switch primarily operates on some "metadata" that |
| | 422 | * is accessed via the 'supertype'. |
| | 423 | * This metadata has one of three possible sources. |
| | 424 | * 1/ It is read from a single device. In this case it may not completely |
| | 425 | * describe the array or arrays as some information might be on other |
| | 426 | * devices. |
| | 427 | * 2/ It is read from all devices in a container. In this case all |
| | 428 | * information is present. |
| | 429 | * 3/ It is created by ->init_super / ->add_to_super. In this case it will |
| | 430 | * be complete once enough ->add_to_super calls have completed. |
| | 431 | * |
| | 432 | * When creating an array inside a container, the metadata will be |
| | 433 | * formed by a combination of 2 and 3. The metadata or the array is read, |
| | 434 | * then new information is added. |
| | 435 | * |
| | 436 | * The metadata must sometimes have a concept of a 'current' array |
| | 437 | * and a 'current' device. |
| | 438 | * The 'current' array is set by init_super to be the newly created array, |
| | 439 | * or is set by super_by_fd when it finds it is looking at an array inside |
| | 440 | * a container. |
| | 441 | * |
| | 442 | * The 'current' device is either the device that the metadata was read from |
| | 443 | * in case 1, or the last device added by add_to_super in case 3. |
| | 444 | * Case 2 does not identify a 'current' device. |
| | 445 | */ |
| | 446 | extern struct superswitch { |
| | 447 | |
| | 448 | /* Used to report details of metadata read from a component |
| | 449 | * device. ->load_super has been called. |
| | 450 | */ |
| | 451 | void (*examine_super)(struct supertype *st, char *homehost); |
| | 452 | void (*brief_examine_super)(struct supertype *st, int verbose); |
| | 453 | void (*brief_examine_subarrays)(struct supertype *st, int verbose); |
| | 454 | void (*export_examine_super)(struct supertype *st); |
| | 455 | |
| | 456 | /* Used to report details of an active array. |
| | 457 | * ->load_super was possibly given a 'component' string. |
| | 458 | */ |
| | 459 | void (*detail_super)(struct supertype *st, char *homehost); |
| | 460 | void (*brief_detail_super)(struct supertype *st); |
| | 461 | void (*export_detail_super)(struct supertype *st); |
| | 462 | |
| | 463 | /* Optional: platform hardware / firmware details */ |
| | 464 | int (*detail_platform)(int verbose, int enumerate_only); |
| | 465 | |
| | 466 | /* Used: |
| | 467 | * to get uuid to storing in bitmap metadata |
| | 468 | * and 'reshape' backup-data metadata |
| | 469 | * To see if a device is being re-added to an array it was part of. |
| | 470 | */ |
| | 471 | void (*uuid_from_super)(struct supertype *st, int uuid[4]); |
| | 472 | |
| | 473 | /* Extract generic details from metadata. This could be details about |
| | 474 | * the container, or about an individual array within the container. |
| | 475 | * The determination is made either by: |
| | 476 | * load_super being given a 'component' string. |
| | 477 | * validate_geometry determining what to create. |
| | 478 | * The info includes both array information and device information. |
| | 479 | * The particular device should be: |
| | 480 | * The last device added by add_to_super |
| | 481 | * The device the metadata was loaded from by load_super |
| | 482 | */ |
| | 483 | void (*getinfo_super)(struct supertype *st, struct mdinfo *info); |
| | 484 | |
| | 485 | /* Check if the given metadata is flagged as belonging to "this" |
| | 486 | * host. 0 for 'no', 1 for 'yes', -1 for "Don't record homehost" |
| | 487 | */ |
| | 488 | int (*match_home)(struct supertype *st, char *homehost); |
| | 489 | |
| | 490 | /* Make one of several generic modifications to metadata |
| | 491 | * prior to assembly (or other times). |
| | 492 | * sparc2.2 - first bug in early 0.90 metadata |
| | 493 | * super-minor - change name of 0.90 metadata |
| | 494 | * summaries - 'correct' any redundant data |
| | 495 | * resync - mark array as dirty to trigger a resync. |
| | 496 | * uuid - set new uuid - only 0.90 or 1.x |
| | 497 | * name - change the name of the array (where supported) |
| | 498 | * homehost - change which host this array is tied to. |
| | 499 | * devicesize - If metadata is at start of device, change recorded |
| | 500 | * device size to match actual device size |
| | 501 | * byteorder - swap bytes for 0.90 metadata |
| | 502 | * |
| | 503 | * force-one - mark that device as uptodate, not old or failed. |
| | 504 | * force-array - mark array as clean if it would not otherwise |
| | 505 | * assemble |
| | 506 | * assemble - not sure how this is different from force-one... |
| | 507 | * linear-grow-new - add a new device to a linear array, but don't |
| | 508 | * change the size: so superblock still matches |
| | 509 | * linear-grow-update - now change the size of the array. |
| | 510 | */ |
| | 511 | int (*update_super)(struct supertype *st, struct mdinfo *info, |
| | 512 | char *update, |
| | 513 | char *devname, int verbose, |
| | 514 | int uuid_set, char *homehost); |
| | 515 | |
| | 516 | /* Create new metadata for new array as described. This could |
| | 517 | * be a new container, or an array in a pre-existing container. |
| | 518 | * Also used to zero metadata prior to writing it to invalidate old |
| | 519 | * metadata. |
| | 520 | */ |
| | 521 | int (*init_super)(struct supertype *st, mdu_array_info_t *info, |
| | 522 | unsigned long long size, char *name, |
| | 523 | char *homehost, int *uuid); |
| | 524 | |
| | 525 | /* update the metadata to include new device, either at create or |
| | 526 | * when hot-adding a spare. |
| | 527 | */ |
| | 528 | int (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo, |
| | 529 | int fd, char *devname); |
| | 530 | |
| | 531 | /* Write metadata to one device when fixing problems or adding |
| | 532 | * a new device. |
| | 533 | */ |
| | 534 | int (*store_super)(struct supertype *st, int fd); |
| | 535 | |
| | 536 | /* Write all metadata for this array. |
| | 537 | */ |
| | 538 | int (*write_init_super)(struct supertype *st); |
| | 539 | int (*compare_super)(struct supertype *st, struct supertype *tst); |
| | 540 | int (*load_super)(struct supertype *st, int fd, char *devname); |
| | 541 | struct supertype * (*match_metadata_desc)(char *arg); |
| | 542 | __u64 (*avail_size)(struct supertype *st, __u64 size); |
| | 543 | int (*add_internal_bitmap)(struct supertype *st, int *chunkp, |
| | 544 | int delay, int write_behind, |
| | 545 | unsigned long long size, int may_change, int major); |
| | 546 | void (*locate_bitmap)(struct supertype *st, int fd); |
| | 547 | int (*write_bitmap)(struct supertype *st, int fd); |
| | 548 | void (*free_super)(struct supertype *st); |
| | 549 | |
| | 550 | /* validate_geometry is called with an st returned by |
| | 551 | * match_metadata_desc. |
| | 552 | * It should check that the geometry described in compatible with |
| | 553 | * the metadata type. It will be called repeatedly as devices |
| | 554 | * added to validate changing size and new devices. If there are |
| | 555 | * inter-device dependencies, it should record sufficient details |
| | 556 | * so these can be validated. |
| | 557 | * Both 'size' and '*freesize' are in sectors. chunk is bytes. |
| | 558 | */ |
| | 559 | int (*validate_geometry)(struct supertype *st, int level, int layout, |
| | 560 | int raiddisks, |
| | 561 | int chunk, unsigned long long size, |
| | 562 | char *subdev, unsigned long long *freesize, |
| | 563 | int verbose); |
| | 564 | |
| | 565 | struct mdinfo *(*container_content)(struct supertype *st); |
| | 566 | /* Allow a metadata handler to override mdadm's default layouts */ |
| | 567 | int (*default_layout)(int level); /* optional */ |
| | 568 | |
| | 569 | /* for mdmon */ |
| | 570 | int (*open_new)(struct supertype *c, struct active_array *a, |
| | 571 | char *inst); |
| | 572 | |
| | 573 | /* Tell the metadata handler the current state of the array. |
| | 574 | * This covers whether it is known to be consistent (no pending writes) |
| | 575 | * and how far along a resync is known to have progressed |
| | 576 | * (in a->resync_start). |
| | 577 | * resync status is really irrelevant if the array is not consistent, |
| | 578 | * but some metadata (DDF!) have a place to record the distinction. |
| | 579 | * If 'consistent' is '2', then the array can mark it dirty if a |
| | 580 | * resync/recovery/whatever is required, or leave it clean if not. |
| | 581 | * Return value is 0 dirty (not consistent) and 1 if clean. |
| | 582 | * it is only really important if consistent is passed in as '2'. |
| | 583 | */ |
| | 584 | int (*set_array_state)(struct active_array *a, int consistent); |
| | 585 | |
| | 586 | /* When the state of a device might have changed, we call set_disk to |
| | 587 | * tell the metadata what the current state is. |
| | 588 | * Typically this happens on spare->in_sync and (spare|in_sync)->faulty |
| | 589 | * transitions. |
| | 590 | * set_disk might be called when the state of the particular disk has |
| | 591 | * not in fact changed. |
| | 592 | */ |
| | 593 | void (*set_disk)(struct active_array *a, int n, int state); |
| | 594 | void (*sync_metadata)(struct supertype *st); |
| | 595 | void (*process_update)(struct supertype *st, |
| | 596 | struct metadata_update *update); |
| | 597 | void (*prepare_update)(struct supertype *st, |
| | 598 | struct metadata_update *update); |
| | 599 | |
| | 600 | /* activate_spare will check if the array is degraded and, if it |
| | 601 | * is, try to find some spare space in the container. |
| | 602 | * On success, it add appropriate updates (For process_update) to |
| | 603 | * to the 'updates' list and returns a list of 'mdinfo' identifying |
| | 604 | * the device, or devices as there might be multiple missing |
| | 605 | * devices and multiple spares available. |
| | 606 | */ |
| | 607 | struct mdinfo *(*activate_spare)(struct active_array *a, |
| | 608 | struct metadata_update **updates); |
| | 609 | |
| | 610 | int swapuuid; /* true if uuid is bigending rather than hostendian */ |
| | 611 | int external; |
| | 612 | const char *name; /* canonical metadata name */ |
| | 613 | } super0, super1, super_ddf, *superlist[]; |
| | 614 | |
| | 615 | extern struct superswitch super_imsm; |
| | 616 | |
| | 617 | struct metadata_update { |
| | 618 | int len; |
| | 619 | char *buf; |
| | 620 | void *space; /* allocated space that monitor will use */ |
| | 621 | struct metadata_update *next; |
| | 622 | }; |
| | 623 | |
| | 624 | /* A supertype holds a particular collection of metadata. |
| | 625 | * It identifies the metadata type by the superswitch, and the particular |
| | 626 | * sub-version of that metadata type. |
| | 627 | * metadata read in or created is stored in 'sb' and 'info'. |
| | 628 | * There are also fields used by mdmon to track containers. |
| | 629 | * |
| | 630 | * A supertype may refer to: |
| | 631 | * Just an array, possibly in a container |
| | 632 | * A container, not identifying any particular array |
| | 633 | * Info read from just one device, not yet fully describing the array/container. |
| | 634 | * |
| | 635 | * |
| | 636 | * A supertype is created by: |
| | 637 | * super_by_fd |
| | 638 | * guess_super |
| | 639 | * dup_super |
| | 640 | */ |
| | 641 | struct supertype { |
| | 642 | struct superswitch *ss; |
| | 643 | int minor_version; |
| | 644 | int max_devs; |
| | 645 | int container_dev; /* devnum of container */ |
| | 646 | char subarray[32]; /* name of array inside container */ |
| | 647 | void *sb; |
| | 648 | void *info; |
| | 649 | int loaded_container; /* Set if load_super found a container, |
| | 650 | * not just one device */ |
| | 651 | |
| | 652 | struct metadata_update *updates; |
| | 653 | struct metadata_update **update_tail; |
| | 654 | |
| | 655 | /* extra stuff used by mdmon */ |
| | 656 | struct active_array *arrays; |
| | 657 | int sock; /* listen to external programs */ |
| | 658 | int devnum; |
| | 659 | char *devname; /* e.g. md0. This appears in metadata_verison: |
| | 660 | * external:/md0/12 |
| | 661 | */ |
| | 662 | int devcnt; |
| | 663 | |
| | 664 | struct mdinfo *devs; |
| | 665 | |
| | 666 | }; |
| | 667 | |
| | 668 | extern struct supertype *super_by_fd(int fd); |
| | 669 | extern struct supertype *guess_super(int fd); |
| | 670 | extern struct supertype *dup_super(struct supertype *st); |
| | 671 | extern int get_dev_size(int fd, char *dname, unsigned long long *sizep); |
| | 672 | extern void get_one_disk(int mdfd, mdu_array_info_t *ainf, |
| | 673 | mdu_disk_info_t *disk); |
| | 674 | void wait_for(char *dev, int fd); |
| | 675 | |
| | 676 | #if __GNUC__ < 3 |
| | 677 | struct stat64; |
| | 678 | #endif |
| | 679 | |
| | 680 | #define HAVE_NFTW we assume |
| | 681 | #define HAVE_FTW |
| | 682 | |
| | 683 | #ifdef __UCLIBC__ |
| | 684 | # include <features.h> |
| | 685 | # ifndef __UCLIBC_HAS_LFS__ |
| | 686 | # define lseek64 lseek |
| | 687 | # endif |
| | 688 | # ifndef __UCLIBC_HAS_FTW__ |
| | 689 | # undef HAVE_FTW |
| | 690 | # undef HAVE_NFTW |
| | 691 | # endif |
| | 692 | #endif |
| | 693 | |
| | 694 | #ifdef __dietlibc__ |
| | 695 | # undef HAVE_NFTW |
| | 696 | #endif |
| | 697 | |
| | 698 | #if defined(__KLIBC__) |
| | 699 | # undef HAVE_NFTW |
| | 700 | # undef HAVE_FTW |
| | 701 | #endif |
| | 702 | |
| | 703 | #ifndef HAVE_NFTW |
| | 704 | # define FTW_PHYS 1 |
| | 705 | # ifndef HAVE_FTW |
| | 706 | struct FTW {}; |
| | 707 | # endif |
| | 708 | #endif |
| | 709 | |
| | 710 | #ifdef HAVE_FTW |
| | 711 | # include <ftw.h> |
| | 712 | #endif |
| | 713 | |
| | 714 | extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s); |
| | 715 | |
| | 716 | |
| | 717 | extern int Manage_ro(char *devname, int fd, int readonly); |
| | 718 | extern int Manage_runstop(char *devname, int fd, int runstop, int quiet); |
| | 719 | extern int Manage_resize(char *devname, int fd, long long size, int raid_disks); |
| | 720 | extern int Manage_subdevs(char *devname, int fd, |
| | 721 | mddev_dev_t devlist, int verbose); |
| | 722 | extern int autodetect(void); |
| | 723 | extern int Grow_Add_device(char *devname, int fd, char *newdev); |
| | 724 | extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force); |
| | 725 | extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file, |
| | 726 | long long size, |
| | 727 | int level, char *layout_str, int chunksize, int raid_disks); |
| | 728 | extern int Grow_restart(struct supertype *st, struct mdinfo *info, |
| | 729 | int *fdlist, int cnt, char *backup_file, int verbose); |
| | 730 | extern int Grow_continue(int mdfd, struct supertype *st, |
| | 731 | struct mdinfo *info, char *backup_file); |
| | 732 | |
| | 733 | extern int Assemble(struct supertype *st, char *mddev, |
| | 734 | mddev_ident_t ident, |
| | 735 | mddev_dev_t devlist, char *backup_file, |
| | 736 | int readonly, int runstop, |
| | 737 | char *update, char *homehost, int require_homehost, |
| | 738 | int verbose, int force); |
| | 739 | |
| | 740 | extern int Build(char *mddev, int chunk, int level, int layout, |
| | 741 | int raiddisks, mddev_dev_t devlist, int assume_clean, |
| | 742 | char *bitmap_file, int bitmap_chunk, int write_behind, |
| | 743 | int delay, int verbose, int autof, unsigned long long size); |
| | 744 | |
| | 745 | |
| | 746 | extern int Create(struct supertype *st, char *mddev, |
| | 747 | int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks, |
| | 748 | char *name, char *homehost, int *uuid, |
| | 749 | int subdevs, mddev_dev_t devlist, |
| | 750 | int runstop, int verbose, int force, int assume_clean, |
| | 751 | char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int autof); |
| | 752 | |
| | 753 | extern int Detail(char *dev, int brief, int export, int test, char *homehost); |
| | 754 | extern int Detail_Platform(struct superswitch *ss, int scan, int verbose); |
| | 755 | extern int Query(char *dev); |
| | 756 | extern int Examine(mddev_dev_t devlist, int brief, int export, int scan, |
| | 757 | int SparcAdjust, struct supertype *forcest, char *homehost); |
| | 758 | extern int Monitor(mddev_dev_t devlist, |
| | 759 | char *mailaddr, char *alert_cmd, |
| | 760 | int period, int daemonise, int scan, int oneshot, |
| | 761 | int dosyslog, int test, char *pidfile, int increments); |
| | 762 | |
| | 763 | extern int Kill(char *dev, struct supertype *st, int force, int quiet, int noexcl); |
| | 764 | extern int Wait(char *dev); |
| | 765 | extern int WaitClean(char *dev, int sock, int verbose); |
| | 766 | |
| | 767 | extern int Incremental(char *devname, int verbose, int runstop, |
| | 768 | struct supertype *st, char *homehost, int require_homehost, |
| | 769 | int autof); |
| | 770 | extern int Incremental_container(struct supertype *st, char *devname, |
| | 771 | int verbose, int runstop, int autof, |
| | 772 | int trustworthy); |
| | 773 | extern void RebuildMap(void); |
| | 774 | extern int IncrementalScan(int verbose); |
| | 775 | |
| | 776 | extern int CreateBitmap(char *filename, int force, char uuid[16], |
| | 777 | unsigned long chunksize, unsigned long daemon_sleep, |
| | 778 | unsigned long write_behind, |
| | 779 | unsigned long long array_size, |
| | 780 | int major); |
| | 781 | extern int ExamineBitmap(char *filename, int brief, struct supertype *st); |
| | 782 | extern int bitmap_update_uuid(int fd, int *uuid, int swap); |
| | 783 | extern unsigned long bitmap_sectors(struct bitmap_super_s *bsb); |
| | 784 | |
| | 785 | extern int md_get_version(int fd); |
| | 786 | extern int get_linux_version(void); |
| | 787 | extern long long parse_size(char *size); |
| | 788 | extern int parse_uuid(char *str, int uuid[4]); |
| | 789 | extern int parse_layout_10(char *layout); |
| | 790 | extern int parse_layout_faulty(char *layout); |
| | 791 | extern int check_ext2(int fd, char *name); |
| | 792 | extern int check_reiser(int fd, char *name); |
| | 793 | extern int check_raid(int fd, char *name); |
| | 794 | |
| | 795 | extern int get_mdp_major(void); |
| | 796 | extern int dev_open(char *dev, int flags); |
| | 797 | extern int open_dev(int devnum); |
| | 798 | extern int open_dev_excl(int devnum); |
| | 799 | extern int is_standard(char *dev, int *nump); |
| | 800 | extern int same_dev(char *one, char *two); |
| | 801 | |
| | 802 | extern int parse_auto(char *str, char *msg, int config); |
| | 803 | extern mddev_ident_t conf_get_ident(char *dev); |
| | 804 | extern mddev_dev_t conf_get_devs(void); |
| | 805 | extern int conf_test_dev(char *devname); |
| | 806 | extern int conf_test_metadata(const char *version); |
| | 807 | extern struct createinfo *conf_get_create_info(void); |
| | 808 | extern void set_conffile(char *file); |
| | 809 | extern char *conf_get_mailaddr(void); |
| | 810 | extern char *conf_get_mailfrom(void); |
| | 811 | extern char *conf_get_program(void); |
| | 812 | extern char *conf_get_homehost(int *require_homehostp); |
| | 813 | extern char *conf_line(FILE *file); |
| | 814 | extern char *conf_word(FILE *file, int allow_key); |
| | 815 | extern int conf_name_is_free(char *name); |
| | 816 | extern int devname_matches(char *name, char *match); |
| | 817 | extern struct mddev_ident_s *conf_match(struct mdinfo *info, struct supertype *st); |
| | 818 | |
| | 819 | extern void free_line(char *line); |
| | 820 | extern int match_oneof(char *devices, char *devname); |
| | 821 | extern void uuid_from_super(int uuid[4], mdp_super_t *super); |
| | 822 | extern const int uuid_match_any[4]; |
| | 823 | extern int same_uuid(int a[4], int b[4], int swapuuid); |
| | 824 | extern void copy_uuid(void *a, int b[4], int swapuuid); |
| | 825 | extern char *__fname_from_uuid(int id[4], int swap, char *buf, char sep); |
| | 826 | extern char *fname_from_uuid(struct supertype *st, |
| | 827 | struct mdinfo *info, char *buf, char sep); |
| | 828 | extern unsigned long calc_csum(void *super, int bytes); |
| | 829 | extern int enough(int level, int raid_disks, int layout, int clean, |
| | 830 | char *avail, int avail_disks); |
| | 831 | extern int ask(char *mesg); |
| | 832 | extern unsigned long long get_component_size(int fd); |
| | 833 | extern void remove_partitions(int fd); |
| | 834 | extern unsigned long long calc_array_size(int level, int raid_disks, int layout, |
| | 835 | int chunksize, unsigned long long devsize); |
| | 836 | extern int flush_metadata_updates(struct supertype *st); |
| | 837 | extern void append_metadata_update(struct supertype *st, void *buf, int len); |
| | 838 | extern int assemble_container_content(struct supertype *st, int mdfd, |
| | 839 | struct mdinfo *content, int runstop, |
| | 840 | char *chosen_name, int verbose); |
| | 841 | |
| | 842 | extern int add_disk(int mdfd, struct supertype *st, |
| | 843 | struct mdinfo *sra, struct mdinfo *info); |
| | 844 | extern int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info); |
| | 845 | |
| | 846 | extern char *human_size(long long bytes); |
| | 847 | extern char *human_size_brief(long long bytes); |
| | 848 | extern void print_r10_layout(int layout); |
| | 849 | |
| | 850 | #define NoMdDev (1<<23) |
| | 851 | extern int find_free_devnum(int use_partitions); |
| | 852 | |
| | 853 | extern void put_md_name(char *name); |
| | 854 | extern char *get_md_name(int dev); |
| | 855 | |
| | 856 | extern char DefaultConfFile[]; |
| | 857 | |
| | 858 | extern int create_mddev(char *dev, char *name, int autof, int trustworthy, |
| | 859 | char *chosen); |
| | 860 | /* values for 'trustworthy' */ |
| | 861 | #define LOCAL 1 |
| | 862 | #define FOREIGN 2 |
| | 863 | #define METADATA 3 |
| | 864 | extern int open_mddev(char *dev, int report_errors); |
| | 865 | extern int open_container(int fd); |
| | 866 | |
| | 867 | extern int mdmon_running(int devnum); |
| | 868 | extern int signal_mdmon(int devnum); |
| | 869 | extern int check_env(char *name); |
| | 870 | extern __u32 random32(void); |
| | 871 | extern int start_mdmon(int devnum); |
| | 872 | |
| | 873 | extern char *devnum2devname(int num); |
| | 874 | extern int devname2devnum(char *name); |
| | 875 | extern int stat2devnum(struct stat *st); |
| | 876 | extern int fd2devnum(int fd); |
| | 877 | |
| | 878 | static inline int dev2major(int d) |
| | 879 | { |
| | 880 | if (d >= 0) |
| | 881 | return MD_MAJOR; |
| | 882 | else |
| | 883 | return get_mdp_major(); |
| | 884 | } |
| | 885 | |
| | 886 | static inline int dev2minor(int d) |
| | 887 | { |
| | 888 | if (d >= 0) |
| | 889 | return d; |
| | 890 | return (-1-d) << MdpMinorShift; |
| | 891 | } |
| | 892 | |
| | 893 | static inline int ROUND_UP(int a, int base) |
| | 894 | { |
| | 895 | return ((a+base-1)/base)*base; |
| | 896 | } |
| | 897 | |
| | 898 | static inline int is_subarray(char *vers) |
| | 899 | { |
| | 900 | /* The version string for a 'subarray' (an array in a container) |
| | 901 | * is |
| | 902 | * /containername/componentname for normal read-write arrays |
| | 903 | * -containername/componentname for read-only arrays. |
| | 904 | * containername is e.g. md0, md_d1 |
| | 905 | * componentname is dependant on the metadata. e.g. '1' 'S1' ... |
| | 906 | */ |
| | 907 | return (*vers == '/' || *vers == '-'); |
| | 908 | } |
| | 909 | |
| | 910 | #ifdef DEBUG |
| | 911 | #define dprintf(fmt, arg...) \ |
| | 912 | fprintf(stderr, fmt, ##arg) |
| | 913 | #else |
| | 914 | #define dprintf(fmt, arg...) \ |
| | 915 | ({ if (0) fprintf(stderr, fmt, ##arg); 0; }) |
| | 916 | #endif |
| | 917 | #include <assert.h> |
| | 918 | #include <stdarg.h> |
| | 919 | static inline int xasprintf(char **strp, const char *fmt, ...) { |
| | 920 | va_list ap; |
| | 921 | int ret; |
| | 922 | va_start(ap, fmt); |
| | 923 | ret = vasprintf(strp, fmt, ap); |
| | 924 | va_end(ap); |
| | 925 | assert(ret >= 0); |
| | 926 | return ret; |
| | 927 | } |
| | 928 | |
| | 929 | #define LEVEL_MULTIPATH (-4) |
| | 930 | #define LEVEL_LINEAR (-1) |
| | 931 | #define LEVEL_FAULTY (-5) |
| | 932 | |
| | 933 | /* kernel module doesn't know about these */ |
| | 934 | #define LEVEL_CONTAINER (-100) |
| | 935 | #define LEVEL_UNSUPPORTED (-200) |
| | 936 | |
| | 937 | |
| | 938 | /* faulty stuff */ |
| | 939 | |
| | 940 | #define WriteTransient 0 |
| | 941 | #define ReadTransient 1 |
| | 942 | #define WritePersistent 2 |
| | 943 | #define ReadPersistent 3 |
| | 944 | #define WriteAll 4 /* doesn't go to device */ |
| | 945 | #define ReadFixable 5 |
| | 946 | #define Modes 6 |
| | 947 | |
| | 948 | #define ClearErrors 31 |
| | 949 | #define ClearFaults 30 |
| | 950 | |
| | 951 | #define AllPersist 100 /* internal use only */ |
| | 952 | #define NoPersist 101 |
| | 953 | |
| | 954 | #define ModeMask 0x1f |
| | 955 | #define ModeShift 5 |
| | 956 | |
| | 957 | |
| | 958 | #ifdef __TINYC__ |
| | 959 | #undef minor |
| | 960 | #undef major |
| | 961 | #undef makedev |
| | 962 | #define minor(x) ((x)&0xff) |
| | 963 | #define major(x) (((x)>>8)&0xff) |
| | 964 | #define makedev(M,m) (((M)<<8) | (m)) |
| | 965 | #endif |
| | 966 | |
| | 967 | /* for raid4/5/6 */ |
| | 968 | #define ALGORITHM_LEFT_ASYMMETRIC 0 |
| | 969 | #define ALGORITHM_RIGHT_ASYMMETRIC 1 |
| | 970 | #define ALGORITHM_LEFT_SYMMETRIC 2 |
| | 971 | #define ALGORITHM_RIGHT_SYMMETRIC 3 |
| | 972 | |
| | 973 | /* Define non-rotating (raid4) algorithms. These allow |
| | 974 | * conversion of raid4 to raid5. |
| | 975 | */ |
| | 976 | #define ALGORITHM_PARITY_0 4 /* P or P,Q are initial devices */ |
| | 977 | #define ALGORITHM_PARITY_N 5 /* P or P,Q are final devices. */ |
| | 978 | |
| | 979 | /* DDF RAID6 layouts differ from md/raid6 layouts in two ways. |
| | 980 | * Firstly, the exact positioning of the parity block is slightly |
| | 981 | * different between the 'LEFT_*' modes of md and the "_N_*" modes |
| | 982 | * of DDF. |
| | 983 | * Secondly, or order of datablocks over which the Q syndrome is computed |
| | 984 | * is different. |
| | 985 | * Consequently we have different layouts for DDF/raid6 than md/raid6. |
| | 986 | * These layouts are from the DDFv1.2 spec. |
| | 987 | * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but |
| | 988 | * leaves RLQ=3 as 'Vendor Specific' |
| | 989 | */ |
| | 990 | |
| | 991 | #define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */ |
| | 992 | #define ALGORITHM_ROTATING_N_RESTART 9 /* DDF PRL=6 RLQ=2 */ |
| | 993 | #define ALGORITHM_ROTATING_N_CONTINUE 10 /*DDF PRL=6 RLQ=3 */ |
| | 994 | |
| | 995 | |
| | 996 | /* For every RAID5 algorithm we define a RAID6 algorithm |
| | 997 | * with exactly the same layout for data and parity, and |
| | 998 | * with the Q block always on the last device (N-1). |
| | 999 | * This allows trivial conversion from RAID5 to RAID6 |
| | 1000 | */ |
| | 1001 | #define ALGORITHM_LEFT_ASYMMETRIC_6 16 |
| | 1002 | #define ALGORITHM_RIGHT_ASYMMETRIC_6 17 |
| | 1003 | #define ALGORITHM_LEFT_SYMMETRIC_6 18 |
| | 1004 | #define ALGORITHM_RIGHT_SYMMETRIC_6 19 |
| | 1005 | #define ALGORITHM_PARITY_0_6 20 |
| | 1006 | #define ALGORITHM_PARITY_N_6 ALGORITHM_PARITY_N |
| | 1007 | |
projects / thirdparty / mdadm.git / blame_incremental