mdadm.h

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2006 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@cse.unsw.edu.au>
  23  *    Paper: Neil Brown
  24  *           School of Computer Science and Engineering
  25  *           The University of New South Wales
  26  *           Sydney, 2052
  27  *           Australia
  28  */
  29
  30 #define _GNU_SOURCE
  31 #define _FILE_OFFSET_BITS 64
  32 #include        <unistd.h>
  33 #if !defined(__dietlibc__) && !defined(__KLIBC__)
  34 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
  35 #else
  36 # if defined(__NO_STAT64) || __WORDSIZE != 32
  37 # define lseek64 lseek
  38 # endif
  39 #endif
  40
  41 #include        <sys/types.h>
  42 #include        <sys/stat.h>
  43 #include        <stdlib.h>
  44 #include        <time.h>
  45 #include        <sys/time.h>
  46 #include        <getopt.h>
  47 #include        <fcntl.h>
  48 #include        <stdio.h>
  49 #include        <errno.h>
  50 #include        <string.h>
  51 #include        <syslog.h>
  52 #ifdef __dietlibc__
  53 #include        <strings.h>
  54 /* dietlibc has deprecated random and srandom!! */
  55 #define random rand
  56 #define srandom srand
  57 #endif
  58
  59
  60 #include        <linux/kdev_t.h>
  61 /*#include      <linux/fs.h> */
  62 #include        <sys/mount.h>
  63 #include        <asm/types.h>
  64 #include        <sys/ioctl.h>
  65 #define MD_MAJOR 9
  66 #define MdpMinorShift 6
  67
  68 #ifndef BLKGETSIZE64
  69 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  70 #endif
  71
  72 #define DEFAULT_BITMAP_CHUNK 4096
  73 #define DEFAULT_BITMAP_DELAY 5
  74 #define DEFAULT_MAX_WRITE_BEHIND 256
  75
  76 #include        "md_u.h"
  77 #include        "md_p.h"
  78 #include        "bitmap.h"
  79
  80 #include <endian.h>
  81 /* Redhat don't like to #include <asm/byteorder.h>, and
  82  * some time include <linux/byteorder/xxx_endian.h> isn't enough,
  83  * and there is no standard conversion function so... */
  84 /* And dietlibc doesn't think byteswap is ok, so.. */
  85 /*  #include <byteswap.h> */
  86 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
  87                      ((x) & 0xff00U) >> 8)
  88 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
  89                      ((x) & 0xff000000U) >> 24 | \
  90                      ((x) & 0x0000ff00U) << 8  | \
  91                      ((x) & 0x00ff0000U) >> 8)
  92 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
  93                      ((x) & 0xff00000000000000ULL) >> 56 | \
  94                      ((x) & 0x000000000000ff00ULL) << 40 | \
  95                      ((x) & 0x00ff000000000000ULL) >> 40 | \
  96                      ((x) & 0x0000000000ff0000ULL) << 24 | \
  97                      ((x) & 0x0000ff0000000000ULL) >> 24 | \
  98                      ((x) & 0x00000000ff000000ULL) << 8 | \
  99                      ((x) & 0x000000ff00000000ULL) >> 8)
 100
 101 #if !defined(__KLIBC__)
 102 #if BYTE_ORDER == LITTLE_ENDIAN
 103 #define __cpu_to_le16(_x) (_x)
 104 #define __cpu_to_le32(_x) (_x)
 105 #define __cpu_to_le64(_x) (_x)
 106 #define __le16_to_cpu(_x) (_x)
 107 #define __le32_to_cpu(_x) (_x)
 108 #define __le64_to_cpu(_x) (_x)
 109 #elif BYTE_ORDER == BIG_ENDIAN
 110 #define __cpu_to_le16(_x) bswap_16(_x)
 111 #define __cpu_to_le32(_x) bswap_32(_x)
 112 #define __cpu_to_le64(_x) bswap_64(_x)
 113 #define __le16_to_cpu(_x) bswap_16(_x)
 114 #define __le32_to_cpu(_x) bswap_32(_x)
 115 #define __le64_to_cpu(_x) bswap_64(_x)
 116 #else
 117 #  error "unknown endianness."
 118 #endif
 119 #endif /* __KLIBC__ */
 120
 121
 122
 123 /* general information that might be extracted from a superblock */
 124 struct mdinfo {
 125         mdu_array_info_t        array;
 126         mdu_disk_info_t         disk;
 127         __u64                   events;
 128         int                     uuid[4];
 129         char                    name[33];
 130         unsigned long long      data_offset;
 131         unsigned long long      component_size;
 132         int                     reshape_active;
 133         unsigned long long      reshape_progress;
 134         int                     new_level, delta_disks, new_layout, new_chunk;
 135         int                     errors;
 136         int                     cache_size; /* size of raid456 stripe cache*/
 137         int                     mismatch_cnt;
 138         char                    text_version[50];
 139
 140         char            sys_name[20];
 141         struct mdinfo *devs;
 142         struct mdinfo *next;
 143 };
 144
 145 struct createinfo {
 146         int     uid;
 147         int     gid;
 148         int     autof;
 149         int     mode;
 150         int     symlinks;
 151         struct supertype *supertype;
 152 };
 153
 154 #define Name "mdadm"
 155
 156 enum mode {
 157         ASSEMBLE=1,
 158         BUILD,
 159         CREATE,
 160         MANAGE,
 161         MISC,
 162         MONITOR,
 163         GROW,
 164         INCREMENTAL,
 165         AUTODETECT,
 166 };
 167
 168 extern char short_options[];
 169 extern char short_bitmap_options[];
 170 extern char short_bitmap_auto_options[];
 171 extern struct option long_options[];
 172 extern char Version[], Usage[], Help[], OptionHelp[],
 173         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 174         Help_incr[],
 175         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 176
 177 /* for option that don't have short equivilents, we assign arbitrary
 178  * small numbers.  '1' means an undecorated option, so we start at '2'.
 179  */
 180 enum special_options {
 181         AssumeClean = 2,
 182         BitmapChunk,
 183         WriteBehind,
 184         ReAdd,
 185         NoDegraded,
 186         Sparc22,
 187         BackupFile,
 188         HomeHost,
 189         AutoHomeHost,
 190         Symlinks,
 191         AutoDetect,
 192 };
 193
 194 /* structures read from config file */
 195 /* List of mddevice names and identifiers
 196  * Identifiers can be:
 197  *    uuid=128-hex-uuid
 198  *    super-minor=decimal-minor-number-from-superblock
 199  *    devices=comma,separated,list,of,device,names,with,wildcards
 200  *
 201  * If multiple fields are present, the intersection of all matching
 202  * devices is considered
 203  */
 204 #define UnSet (0xfffe)
 205 typedef struct mddev_ident_s {
 206         char    *devname;
 207
 208         int     uuid_set;
 209         int     uuid[4];
 210         char    name[33];
 211
 212         unsigned int super_minor;
 213
 214         char    *devices;       /* comma separated list of device
 215                                  * names with wild cards
 216                                  */
 217         int     level;
 218         unsigned int raid_disks;
 219         unsigned int spare_disks;
 220         struct supertype *st;
 221         int     autof;          /* 1 for normal, 2 for partitioned */
 222         char    *spare_group;
 223         char    *bitmap_file;
 224         int     bitmap_fd;
 225
 226         struct mddev_ident_s *next;
 227 } *mddev_ident_t;
 228
 229 /* List of device names - wildcards expanded */
 230 typedef struct mddev_dev_s {
 231         char *devname;
 232         char disposition;       /* 'a' for add, 'r' for remove, 'f' for fail.
 233                                  * Not set for names read from .config
 234                                  */
 235         char writemostly;
 236         char re_add;
 237         char used;              /* set when used */
 238         struct mddev_dev_s *next;
 239 } *mddev_dev_t;
 240
 241 typedef struct mapping {
 242         char *name;
 243         int num;
 244 } mapping_t;
 245
 246
 247 struct mdstat_ent {
 248         char            *dev;
 249         int             devnum;
 250         int             active;
 251         char            *level;
 252         char            *pattern; /* U or up, _ for down */
 253         int             percent; /* -1 if no resync */
 254         int             resync; /* 1 if resync, 0 if recovery */
 255         struct mdstat_ent *next;
 256 };
 257
 258 extern struct mdstat_ent *mdstat_read(int hold, int start);
 259 extern void free_mdstat(struct mdstat_ent *ms);
 260 extern void mdstat_wait(int seconds);
 261 extern int mddev_busy(int devnum);
 262
 263 struct map_ent {
 264         struct map_ent *next;
 265         int     devnum;
 266         int     major,minor;
 267         int     uuid[4];
 268         char    *path;
 269 };
 270 extern int map_update(struct map_ent **mpp, int devnum, int major, int minor,
 271                       int uuid[4], char *path);
 272 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
 273 extern void map_read(struct map_ent **melp);
 274 extern int map_write(struct map_ent *mel);
 275 extern void map_delete(struct map_ent **mapp, int devnum);
 276 extern void map_free(struct map_ent *map);
 277 extern void map_add(struct map_ent **melp,
 278                     int devnum, int major, int minor, int uuid[4], char *path);
 279
 280 /* various details can be requested */
 281 #define GET_LEVEL       1
 282 #define GET_LAYOUT      2
 283 #define GET_COMPONENT   4
 284 #define GET_CHUNK       8
 285 #define GET_CACHE       16
 286 #define GET_MISMATCH    32
 287 #define GET_VERSION     64
 288
 289 #define GET_DEVS        1024 /* gets role, major, minor */
 290 #define GET_OFFSET      2048
 291 #define GET_SIZE        4096
 292 #define GET_STATE       8192
 293 #define GET_ERROR       16384
 294
 295 /* If fd >= 0, get the array it is open on,
 296  * else use devnum. >=0 -> major9. <0.....
 297  */
 298 extern void sysfs_free(struct mdinfo *sra);
 299 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
 300 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 301                          char *name, char *val);
 302 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 303                          char *name, unsigned long long val);
 304 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 305                         char *name, unsigned long long *val);
 306
 307
 308 extern int save_stripes(int *source, unsigned long long *offsets,
 309                         int raid_disks, int chunk_size, int level, int layout,
 310                         int nwrites, int *dest,
 311                         unsigned long long start, unsigned long long length);
 312 extern int restore_stripes(int *dest, unsigned long long *offsets,
 313                            int raid_disks, int chunk_size, int level, int layout,
 314                            int source, unsigned long long read_offset,
 315                            unsigned long long start, unsigned long long length);
 316
 317 #ifndef Sendmail
 318 #define Sendmail "/usr/lib/sendmail -t"
 319 #endif
 320
 321 #define SYSLOG_FACILITY LOG_DAEMON
 322
 323 extern char *map_num(mapping_t *map, int num);
 324 extern int map_name(mapping_t *map, char *name);
 325 extern mapping_t r5layout[], pers[], modes[], faultylayout[];
 326
 327 extern char *map_dev(int major, int minor, int create);
 328
 329
 330 extern struct superswitch {
 331         void (*examine_super)(struct supertype *st, char *homehost);
 332         void (*brief_examine_super)(struct supertype *st);
 333         void (*export_examine_super)(struct supertype *st);
 334         void (*detail_super)(struct supertype *st, char *homehost);
 335         void (*brief_detail_super)(struct supertype *st);
 336         void (*export_detail_super)(struct supertype *st);
 337         void (*uuid_from_super)(struct supertype *st, int uuid[4]);
 338         void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
 339         int (*match_home)(struct supertype *st, char *homehost);
 340         int (*update_super)(struct supertype *st, struct mdinfo *info,
 341                             char *update,
 342                             char *devname, int verbose,
 343                             int uuid_set, char *homehost);
 344         int (*init_super)(struct supertype *st, mdu_array_info_t *info,
 345                           unsigned long long size, char *name,
 346                           char *homehost, int *uuid);
 347         void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo);
 348         int (*store_super)(struct supertype *st, int fd);
 349         int (*write_init_super)(struct supertype *st, mdu_disk_info_t *dinfo,
 350                                 char *devname);
 351         int (*compare_super)(struct supertype *st, struct supertype *tst);
 352         int (*load_super)(struct supertype *st, int fd, char *devname);
 353         struct supertype * (*match_metadata_desc)(char *arg);
 354         __u64 (*avail_size)(struct supertype *st, __u64 size);
 355         int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
 356                                    int delay, int write_behind,
 357                                    unsigned long long size, int may_change, int major);
 358         void (*locate_bitmap)(struct supertype *st, int fd);
 359         int (*write_bitmap)(struct supertype *st, int fd);
 360         void (*free_super)(struct supertype *st);
 361         int major;
 362         int swapuuid; /* true if uuid is bigending rather than hostendian */
 363 } super0, super1, *superlist[];
 364
 365 struct supertype {
 366         struct superswitch *ss;
 367         int minor_version;
 368         int max_devs;
 369         void *sb;
 370 };
 371
 372 extern struct supertype *super_by_fd(int fd);
 373 extern struct supertype *guess_super(int fd);
 374 extern struct supertype *dup_super(struct supertype *st);
 375 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 376 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 377                          mdu_disk_info_t *disk);
 378
 379 #if __GNUC__ < 3
 380 struct stat64;
 381 #endif
 382
 383 #define HAVE_NFTW  we assume
 384 #define HAVE_FTW
 385
 386 #ifdef UCLIBC
 387 # include <features.h>
 388 # ifndef  __UCLIBC_HAS_FTW__
 389 #  undef HAVE_FTW
 390 #  undef HAVE_NFTW
 391 # endif
 392 #endif
 393
 394 #ifdef __dietlibc__
 395 # undef HAVE_NFTW
 396 #endif
 397
 398 #if defined(__KLIBC__)
 399 # undef HAVE_NFTW
 400 # undef HAVE_FTW
 401 #endif
 402
 403 #ifndef HAVE_NFTW
 404 # define FTW_PHYS 1
 405 # ifndef HAVE_FTW
 406   struct FTW {};
 407 # endif
 408 #endif
 409
 410 #ifdef HAVE_FTW
 411 # include <ftw.h>
 412 #endif
 413
 414 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 415
 416
 417 extern int Manage_ro(char *devname, int fd, int readonly);
 418 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
 419 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
 420 extern int Manage_reconfig(char *devname, int fd, int layout);
 421 extern int Manage_subdevs(char *devname, int fd,
 422                           mddev_dev_t devlist, int verbose);
 423 extern int autodetect(void);
 424 extern int Grow_Add_device(char *devname, int fd, char *newdev);
 425 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
 426 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
 427                         long long size,
 428                         int level, int layout, int chunksize, int raid_disks);
 429 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
 430                         int *fdlist, int cnt, char *backup_file);
 431
 432
 433 extern int Assemble(struct supertype *st, char *mddev, int mdfd,
 434                     mddev_ident_t ident,
 435                     mddev_dev_t devlist, char *backup_file,
 436                     int readonly, int runstop,
 437                     char *update, char *homehost,
 438                     int verbose, int force);
 439
 440 extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
 441                  int raiddisks,
 442                  mddev_dev_t devlist, int assume_clean,
 443                  char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
 444
 445
 446 extern int Create(struct supertype *st, char *mddev, int mdfd,
 447                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
 448                   char *name, char *homehost, int *uuid,
 449                   int subdevs, mddev_dev_t devlist,
 450                   int runstop, int verbose, int force, int assume_clean,
 451                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
 452
 453 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
 454 extern int Query(char *dev);
 455 extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
 456                    int SparcAdjust, struct supertype *forcest, char *homehost);
 457 extern int Monitor(mddev_dev_t devlist,
 458                    char *mailaddr, char *alert_cmd,
 459                    int period, int daemonise, int scan, int oneshot,
 460                    int dosyslog, int test, char *pidfile);
 461
 462 extern int Kill(char *dev, int force, int quiet);
 463 extern int Wait(char *dev);
 464
 465 extern int Incremental(char *devname, int verbose, int runstop,
 466                        struct supertype *st, char *homehost, int autof);
 467 extern void RebuildMap(void);
 468 extern int IncrementalScan(int verbose);
 469
 470 extern int CreateBitmap(char *filename, int force, char uuid[16],
 471                         unsigned long chunksize, unsigned long daemon_sleep,
 472                         unsigned long write_behind,
 473                         unsigned long long array_size,
 474                         int major);
 475 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
 476 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
 477 extern unsigned long bitmap_sectors(struct bitmap_super_s *bsb);
 478
 479 extern int md_get_version(int fd);
 480 extern int get_linux_version(void);
 481 extern int parse_uuid(char *str, int uuid[4]);
 482 extern int check_ext2(int fd, char *name);
 483 extern int check_reiser(int fd, char *name);
 484 extern int check_raid(int fd, char *name);
 485
 486 extern int get_mdp_major(void);
 487 extern int dev_open(char *dev, int flags);
 488 extern int is_standard(char *dev, int *nump);
 489
 490 extern int parse_auto(char *str, char *msg, int config);
 491 extern mddev_ident_t conf_get_ident(char *dev);
 492 extern mddev_dev_t conf_get_devs(void);
 493 extern int conf_test_dev(char *devname);
 494 extern struct createinfo *conf_get_create_info(void);
 495 extern void set_conffile(char *file);
 496 extern char *conf_get_mailaddr(void);
 497 extern char *conf_get_mailfrom(void);
 498 extern char *conf_get_program(void);
 499 extern char *conf_get_homehost(void);
 500 extern char *conf_line(FILE *file);
 501 extern char *conf_word(FILE *file, int allow_key);
 502 extern void free_line(char *line);
 503 extern int match_oneof(char *devices, char *devname);
 504 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
 505 extern int same_uuid(int a[4], int b[4], int swapuuid);
 506 extern void copy_uuid(void *a, int b[4], int swapuuid);
 507 extern unsigned long calc_csum(void *super, int bytes);
 508 extern int enough(int level, int raid_disks, int layout, int clean,
 509                    char *avail, int avail_disks);
 510 extern int ask(char *mesg);
 511 extern unsigned long long get_component_size(int fd);
 512 extern void remove_partitions(int fd);
 513
 514
 515 extern char *human_size(long long bytes);
 516 extern char *human_size_brief(long long bytes);
 517 extern void print_r10_layout(int layout);
 518
 519 #define NoMdDev (1<<23)
 520 extern int find_free_devnum(int use_partitions);
 521
 522 extern void put_md_name(char *name);
 523 extern char *get_md_name(int dev);
 524
 525 extern char DefaultConfFile[];
 526
 527 extern int open_mddev(char *dev, int autof);
 528 extern int open_mddev_devnum(char *devname, int devnum, char *name,
 529                              char *chosen_name, int parts);
 530
 531
 532 #define LEVEL_MULTIPATH         (-4)
 533 #define LEVEL_LINEAR            (-1)
 534 #define LEVEL_FAULTY            (-5)
 535
 536
 537 /* faulty stuff */
 538
 539 #define WriteTransient  0
 540 #define ReadTransient   1
 541 #define WritePersistent 2
 542 #define ReadPersistent  3
 543 #define WriteAll        4 /* doesn't go to device */
 544 #define ReadFixable     5
 545 #define Modes   6
 546
 547 #define ClearErrors     31
 548 #define ClearFaults     30
 549
 550 #define AllPersist      100 /* internal use only */
 551 #define NoPersist       101
 552
 553 #define ModeMask        0x1f
 554 #define ModeShift       5
 555
 556
 557 #ifdef __TINYC__
 558 #undef minor
 559 #undef major
 560 #undef makedev
 561 #define minor(x) ((x)&0xff)
 562 #define major(x) (((x)>>8)&0xff)
 563 #define makedev(M,m) (((M)<<8) | (m))
 564 #endif
 565
 566 /* for raid5 */
 567 #define ALGORITHM_LEFT_ASYMMETRIC       0
 568 #define ALGORITHM_RIGHT_ASYMMETRIC      1
 569 #define ALGORITHM_LEFT_SYMMETRIC        2
 570 #define ALGORITHM_RIGHT_SYMMETRIC       3