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 #include        <unistd.h>
  32 #ifndef __dietlibc__
  33 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
  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
  75 #include <endian.h>
  76 /* Redhat don't like to #include <asm/byteorder.h>, and
  77  * some time include <linux/byteorder/xxx_endian.h> isn't enough,
  78  * and there is no standard conversion function so... */
  79 /* And dietlibc doesn't think byteswap is ok, so.. */
  80 /*  #include <byteswap.h> */
  81 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
  82                      ((x) & 0xff00U) >> 8)
  83 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
  84                      ((x) & 0xff000000U) >> 24 | \
  85                      ((x) & 0x0000ff00U) << 8  | \
  86                      ((x) & 0x00ff0000U) >> 8)
  87 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
  88                      ((x) & 0xff00000000000000ULL) >> 56 | \
  89                      ((x) & 0x000000000000ff00ULL) << 40 | \
  90                      ((x) & 0x00ff000000000000ULL) >> 40 | \
  91                      ((x) & 0x0000000000ff0000ULL) << 24 | \
  92                      ((x) & 0x0000ff0000000000ULL) >> 24 | \
  93                      ((x) & 0x00000000ff000000ULL) << 8 | \
  94                      ((x) & 0x000000ff00000000ULL) >> 8)
  95
  96 #if BYTE_ORDER == LITTLE_ENDIAN
  97 #define __cpu_to_le16(_x) (_x)
  98 #define __cpu_to_le32(_x) (_x)
  99 #define __cpu_to_le64(_x) (_x)
 100 #define __le16_to_cpu(_x) (_x)
 101 #define __le32_to_cpu(_x) (_x)
 102 #define __le64_to_cpu(_x) (_x)
 103 #elif BYTE_ORDER == BIG_ENDIAN
 104 #define __cpu_to_le16(_x) bswap_16(_x)
 105 #define __cpu_to_le32(_x) bswap_32(_x)
 106 #define __cpu_to_le64(_x) bswap_64(_x)
 107 #define __le16_to_cpu(_x) bswap_16(_x)
 108 #define __le32_to_cpu(_x) bswap_32(_x)
 109 #define __le64_to_cpu(_x) bswap_64(_x)
 110 #else
 111 #  error "unknown endianness."
 112 #endif
 113
 114
 115
 116 /* general information that might be extracted from a superblock */
 117 struct mdinfo {
 118         mdu_array_info_t        array;
 119         mdu_disk_info_t         disk;
 120         __u64                   events;
 121         int                     uuid[4];
 122         char                    name[33];
 123         unsigned long long      data_offset;
 124         unsigned long long      component_size;
 125         int                     reshape_active;
 126         unsigned long long      reshape_progress;
 127         int                     new_level, delta_disks, new_layout, new_chunk;
 128 };
 129
 130 struct createinfo {
 131         int     uid;
 132         int     gid;
 133         int     autof;
 134         int     mode;
 135         int     symlinks;
 136         struct supertype *supertype;
 137 };
 138
 139 #define Name "mdadm"
 140
 141 enum mode {
 142         ASSEMBLE=1,
 143         BUILD,
 144         CREATE,
 145         MANAGE,
 146         MISC,
 147         MONITOR,
 148         GROW,
 149 };
 150
 151 extern char short_options[];
 152 extern char short_bitmap_auto_options[];
 153 extern struct option long_options[];
 154 extern char Version[], Usage[], Help[], OptionHelp[],
 155         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 156         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 157
 158 /* for option that don't have short equivilents, we assign arbitrary
 159  * small numbers.  '1' means an undecorated option, so we start at '2'.
 160  */
 161 enum special_options {
 162         AssumeClean = 2,
 163         BitmapChunk,
 164         WriteBehind,
 165         ReAdd,
 166         NoDegraded,
 167         Sparc22,
 168         BackupFile,
 169         HomeHost,
 170         AutoHomeHost,
 171         Symlinks,
 172 };
 173
 174 /* structures read from config file */
 175 /* List of mddevice names and identifiers
 176  * Identifiers can be:
 177  *    uuid=128-hex-uuid
 178  *    super-minor=decimal-minor-number-from-superblock
 179  *    devices=comma,separated,list,of,device,names,with,wildcards
 180  *
 181  * If multiple fields are present, the intersection of all matching
 182  * devices is considered
 183  */
 184 #define UnSet (0xfffe)
 185 typedef struct mddev_ident_s {
 186         char    *devname;
 187
 188         int     uuid_set;
 189         int     uuid[4];
 190         char    name[33];
 191
 192         unsigned int super_minor;
 193
 194         char    *devices;       /* comma separated list of device
 195                                  * names with wild cards
 196                                  */
 197         int     level;
 198         unsigned int raid_disks;
 199         unsigned int spare_disks;
 200         struct supertype *st;
 201         int     autof;          /* 1 for normal, 2 for partitioned */
 202         char    *spare_group;
 203         char    *bitmap_file;
 204         int     bitmap_fd;
 205
 206         struct mddev_ident_s *next;
 207 } *mddev_ident_t;
 208
 209 /* List of device names - wildcards expanded */
 210 typedef struct mddev_dev_s {
 211         char *devname;
 212         char disposition;       /* 'a' for add, 'r' for remove, 'f' for fail.
 213                                  * Not set for names read from .config
 214                                  */
 215         char writemostly;
 216         char re_add;
 217         char used;              /* set when used */
 218         struct mddev_dev_s *next;
 219 } *mddev_dev_t;
 220
 221 typedef struct mapping {
 222         char *name;
 223         int num;
 224 } mapping_t;
 225
 226
 227 struct mdstat_ent {
 228         char            *dev;
 229         int             devnum;
 230         int             active;
 231         char            *level;
 232         char            *pattern; /* U or up, _ for down */
 233         int             percent; /* -1 if no resync */
 234         int             resync; /* 1 if resync, 0 if recovery */
 235         struct mdstat_ent *next;
 236 };
 237
 238 extern struct mdstat_ent *mdstat_read(int hold, int start);
 239 extern void free_mdstat(struct mdstat_ent *ms);
 240 extern void mdstat_wait(int seconds);
 241
 242 /* Data structure for holding info read from sysfs */
 243 struct sysdev {
 244         char    name[20];
 245         int     role;
 246         int     major, minor;
 247         unsigned long long offset, size;
 248         int     state;
 249         int     errors;
 250         struct sysdev *next;
 251 };
 252 struct sysarray {
 253         char    name[20];
 254         struct sysdev *devs;
 255         int     chunk;
 256         unsigned long long component_size;
 257         int     layout;
 258         int     level;
 259         int     spares;
 260 };
 261 /* various details can be requested */
 262 #define GET_LEVEL       1
 263 #define GET_LAYOUT      2
 264 #define GET_COMPONENT   4
 265 #define GET_CHUNK       8
 266
 267 #define GET_DEVS        1024 /* gets role, major, minor */
 268 #define GET_OFFSET      2048
 269 #define GET_SIZE        4096
 270 #define GET_STATE       8192
 271 #define GET_ERROR       16384
 272
 273 /* If fd >= 0, get the array it is open on,
 274  * else use devnum. >=0 -> major9. <0.....
 275  */
 276 extern struct sysarray *sysfs_read(int fd, int devnum, unsigned long options);
 277 extern int sysfs_set_str(struct sysarray *sra, struct sysdev *dev,
 278                          char *name, char *val);
 279 extern int sysfs_set_num(struct sysarray *sra, struct sysdev *dev,
 280                          char *name, unsigned long long val);
 281 extern int sysfs_get_ll(struct sysarray *sra, struct sysdev *dev,
 282                         char *name, unsigned long long *val);
 283
 284
 285 extern int save_stripes(int *source, unsigned long long *offsets,
 286                         int raid_disks, int chunk_size, int level, int layout,
 287                         int nwrites, int *dest,
 288                         unsigned long long start, unsigned long long length);
 289 extern int restore_stripes(int *dest, unsigned long long *offsets,
 290                            int raid_disks, int chunk_size, int level, int layout,
 291                            int source, unsigned long long read_offset,
 292                            unsigned long long start, unsigned long long length);
 293
 294 #ifndef Sendmail
 295 #define Sendmail "/usr/lib/sendmail -t"
 296 #endif
 297
 298 #define SYSLOG_FACILITY LOG_DAEMON
 299
 300 extern char *map_num(mapping_t *map, int num);
 301 extern int map_name(mapping_t *map, char *name);
 302 extern mapping_t r5layout[], pers[], modes[], faultylayout[];
 303
 304 extern char *map_dev(int major, int minor, int create);
 305
 306
 307 extern struct superswitch {
 308         void (*examine_super)(void *sbv, char *homehost);
 309         void (*brief_examine_super)(void *sbv);
 310         void (*detail_super)(void *sbv, char *homehost);
 311         void (*brief_detail_super)(void *sbv);
 312         void (*uuid_from_super)(int uuid[4], void *sbv);
 313         void (*getinfo_super)(struct mdinfo *info, void *sbv);
 314         int (*match_home)(void *sbv, char *homehost);
 315         int (*update_super)(struct mdinfo *info, void *sbv, char *update,
 316                             char *devname, int verbose,
 317                             int uuid_set, char *homehost);
 318         int (*init_super)(struct supertype *st, void **sbp, mdu_array_info_t *info, unsigned long long size, char *name, char *homehost);
 319         void (*add_to_super)(void *sbv, mdu_disk_info_t *dinfo);
 320         int (*store_super)(struct supertype *st, int fd, void *sbv);
 321         int (*write_init_super)(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname);
 322         int (*compare_super)(void **firstp, void *secondv);
 323         int (*load_super)(struct supertype *st, int fd, void **sbp, char *devname);
 324         struct supertype * (*match_metadata_desc)(char *arg);
 325         __u64 (*avail_size)(struct supertype *st, __u64 size);
 326         int (*add_internal_bitmap)(struct supertype *st, void *sbv, int *chunkp,
 327                                    int delay, int write_behind,
 328                                    unsigned long long size, int may_change, int major);
 329         void (*locate_bitmap)(struct supertype *st, int fd, void *sbv);
 330         int (*write_bitmap)(struct supertype *st, int fd, void *sbv);
 331         int major;
 332         int swapuuid; /* true if uuid is bigending rather than hostendian */
 333 } super0, super1, *superlist[];
 334
 335 struct supertype {
 336         struct superswitch *ss;
 337         int minor_version;
 338         int max_devs;
 339 };
 340
 341 extern struct supertype *super_by_version(int vers, int minor);
 342 extern struct supertype *guess_super(int fd);
 343
 344 #if __GNUC__ < 3
 345 struct stat64;
 346 #endif
 347
 348 #define HAVE_NFTW  we assume
 349 #define HAVE_FTW
 350
 351 #ifdef UCLIBC
 352 # include <features.h>
 353 # ifndef  __UCLIBC_HAS_FTW__
 354 #  undef HAVE_FTW
 355 #  undef HAVE_NFTW
 356 # endif
 357 #endif
 358
 359 #ifdef __dietlibc__
 360 # undef HAVE_NFTW
 361 #endif
 362
 363 #ifndef HAVE_NFTW
 364 # define FTW_PHYS 1
 365 # ifndef HAVE_FTW
 366   struct FTW {};
 367 # endif
 368 #endif
 369
 370 #ifdef HAVE_FTW
 371 # include <ftw.h>
 372 #endif
 373
 374 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 375
 376
 377 extern int Manage_ro(char *devname, int fd, int readonly);
 378 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
 379 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
 380 extern int Manage_reconfig(char *devname, int fd, int layout);
 381 extern int Manage_subdevs(char *devname, int fd,
 382                           mddev_dev_t devlist, int verbose);
 383 extern int Grow_Add_device(char *devname, int fd, char *newdev);
 384 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
 385 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
 386                         long long size,
 387                         int level, int layout, int chunksize, int raid_disks);
 388 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
 389                         int *fdlist, int cnt, char *backup_file);
 390
 391
 392 extern int Assemble(struct supertype *st, char *mddev, int mdfd,
 393                     mddev_ident_t ident,
 394                     mddev_dev_t devlist, char *backup_file,
 395                     int readonly, int runstop,
 396                     char *update, char *homehost,
 397                     int verbose, int force);
 398
 399 extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
 400                  int raiddisks,
 401                  mddev_dev_t devlist, int assume_clean,
 402                  char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
 403
 404
 405 extern int Create(struct supertype *st, char *mddev, int mdfd,
 406                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
 407                   char *name, char *homehost,
 408                   int subdevs, mddev_dev_t devlist,
 409                   int runstop, int verbose, int force, int assume_clean,
 410                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
 411
 412 extern int Detail(char *dev, int brief, int test, char *homehost);
 413 extern int Query(char *dev);
 414 extern int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust,
 415                    struct supertype *forcest, char *homehost);
 416 extern int Monitor(mddev_dev_t devlist,
 417                    char *mailaddr, char *alert_cmd,
 418                    int period, int daemonise, int scan, int oneshot,
 419                    int dosyslog, int test, char *pidfile);
 420
 421 extern int Kill(char *dev, int force, int quiet);
 422
 423 extern int CreateBitmap(char *filename, int force, char uuid[16],
 424                         unsigned long chunksize, unsigned long daemon_sleep,
 425                         unsigned long write_behind,
 426                         unsigned long long array_size,
 427                         int major);
 428 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
 429 extern int bitmap_update_uuid(int fd, int *uuid);
 430
 431 extern int md_get_version(int fd);
 432 extern int get_linux_version(void);
 433 extern int parse_uuid(char *str, int uuid[4]);
 434 extern int check_ext2(int fd, char *name);
 435 extern int check_reiser(int fd, char *name);
 436 extern int check_raid(int fd, char *name);
 437
 438 extern int get_mdp_major(void);
 439 extern int dev_open(char *dev, int flags);
 440 extern int is_standard(char *dev, int *nump);
 441
 442 extern int parse_auto(char *str, char *msg, int config);
 443 extern mddev_ident_t conf_get_ident(char *dev);
 444 extern mddev_dev_t conf_get_devs(void);
 445 extern struct createinfo *conf_get_create_info(void);
 446 extern void set_conffile(char *file);
 447 extern char *conf_get_mailaddr(void);
 448 extern char *conf_get_mailfrom(void);
 449 extern char *conf_get_program(void);
 450 extern char *conf_get_homehost(void);
 451 extern char *conf_line(FILE *file);
 452 extern char *conf_word(FILE *file, int allow_key);
 453 extern void free_line(char *line);
 454 extern int match_oneof(char *devices, char *devname);
 455 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
 456 extern int same_uuid(int a[4], int b[4], int swapuuid);
 457 /* extern int compare_super(mdp_super_t *first, mdp_super_t *second);*/
 458 extern unsigned long calc_csum(void *super, int bytes);
 459 extern int enough(int level, int raid_disks, int layout, int clean,
 460                    char *avail, int avail_disks);
 461 extern int ask(char *mesg);
 462 extern unsigned long long get_component_size(int fd);
 463 extern void remove_partitions(int fd);
 464
 465
 466 extern char *human_size(long long bytes);
 467 char *human_size_brief(long long bytes);
 468
 469 extern void put_md_name(char *name);
 470 extern char *get_md_name(int dev);
 471
 472 extern char DefaultConfFile[];
 473
 474 extern int open_mddev(char *dev, int autof);
 475
 476
 477 #define LEVEL_MULTIPATH         (-4)
 478 #define LEVEL_LINEAR            (-1)
 479 #define LEVEL_FAULTY            (-5)
 480
 481
 482 /* faulty stuff */
 483
 484 #define WriteTransient  0
 485 #define ReadTransient   1
 486 #define WritePersistent 2
 487 #define ReadPersistent  3
 488 #define WriteAll        4 /* doesn't go to device */
 489 #define ReadFixable     5
 490 #define Modes   6
 491
 492 #define ClearErrors     31
 493 #define ClearFaults     30
 494
 495 #define AllPersist      100 /* internal use only */
 496 #define NoPersist       101
 497
 498 #define ModeMask        0x1f
 499 #define ModeShift       5
 500
 501
 502 #ifdef __TINYC__
 503 #undef minor
 504 #undef major
 505 #undef makedev
 506 #define minor(x) ((x)&0xff)
 507 #define major(x) (((x)>>8)&0xff)
 508 #define makedev(M,m) (((M)<<8) | (m))
 509 #endif
 510
 511 /* for raid5 */
 512 #define ALGORITHM_LEFT_ASYMMETRIC       0
 513 #define ALGORITHM_RIGHT_ASYMMETRIC      1
 514 #define ALGORITHM_LEFT_SYMMETRIC        2
 515 #define ALGORITHM_RIGHT_SYMMETRIC       3