mdadm.h

   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_CHUNK 512
  68 #define DEFAULT_BITMAP_CHUNK 4096
  69 #define DEFAULT_BITMAP_DELAY 5
  70 #define DEFAULT_MAX_WRITE_BEHIND 256
  71
  72 /* MAP_DIR should be somewhere that persists across the pivotroot
  73  * from early boot to late boot.
  74  * Currently /dev seems to be the only option on most distros.
  75  */
  76 #ifndef MAP_DIR
  77 #define MAP_DIR "/dev/.mdadm"
  78 #endif /* MAP_DIR */
  79 /* MAP_FILE is what we name the map file we put in MAP_DIR, in case you
  80  * want something other than the default of "map"
  81  */
  82 #ifndef MAP_FILE
  83 #define MAP_FILE "map"
  84 #endif /* MAP_FILE */
  85 /* MDMON_DIR is where pid and socket files used for communicating
  86  * with mdmon normally live.  It *should* be /var/run, but when
  87  * mdmon is needed at early boot then it needs to write there prior
  88  * to /var/run being mounted read/write, and it also then needs to
  89  * persist beyond when /var/run is mounter read-only.  So, to be
  90  * safe, the default is somewhere that is read/write early in the
  91  * boot process and stays up as long as possible during shutdown.
  92  */
  93 #ifndef MDMON_DIR
  94 #define MDMON_DIR "/dev/.mdadm/"
  95 #endif /* MDMON_DIR */
  96
  97 /* FAILED_SLOTS is where to save files storing recent removal of array
  98  * member in order to allow future reuse of disk inserted in the same
  99  * slot for array recovery
 100  */
 101 #ifndef FAILED_SLOTS_DIR
 102 #define FAILED_SLOTS_DIR "/dev/.mdadm/failed-slots"
 103 #endif /* FAILED_SLOTS */
 104
 105 #include        "md_u.h"
 106 #include        "md_p.h"
 107 #include        "bitmap.h"
 108 #include        "msg.h"
 109
 110 #include <endian.h>
 111 /* Redhat don't like to #include <asm/byteorder.h>, and
 112  * some time include <linux/byteorder/xxx_endian.h> isn't enough,
 113  * and there is no standard conversion function so... */
 114 /* And dietlibc doesn't think byteswap is ok, so.. */
 115 /*  #include <byteswap.h> */
 116 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
 117                      ((x) & 0xff00U) >> 8)
 118 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
 119                      ((x) & 0xff000000U) >> 24 | \
 120                      ((x) & 0x0000ff00U) << 8  | \
 121                      ((x) & 0x00ff0000U) >> 8)
 122 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
 123                      ((x) & 0xff00000000000000ULL) >> 56 | \
 124                      ((x) & 0x000000000000ff00ULL) << 40 | \
 125                      ((x) & 0x00ff000000000000ULL) >> 40 | \
 126                      ((x) & 0x0000000000ff0000ULL) << 24 | \
 127                      ((x) & 0x0000ff0000000000ULL) >> 24 | \
 128                      ((x) & 0x00000000ff000000ULL) << 8 | \
 129                      ((x) & 0x000000ff00000000ULL) >> 8)
 130
 131 #if !defined(__KLIBC__)
 132 #if BYTE_ORDER == LITTLE_ENDIAN
 133 #define __cpu_to_le16(_x) (_x)
 134 #define __cpu_to_le32(_x) (_x)
 135 #define __cpu_to_le64(_x) (_x)
 136 #define __le16_to_cpu(_x) (_x)
 137 #define __le32_to_cpu(_x) (_x)
 138 #define __le64_to_cpu(_x) (_x)
 139
 140 #define __cpu_to_be16(_x) bswap_16(_x)
 141 #define __cpu_to_be32(_x) bswap_32(_x)
 142 #define __cpu_to_be64(_x) bswap_64(_x)
 143 #define __be16_to_cpu(_x) bswap_16(_x)
 144 #define __be32_to_cpu(_x) bswap_32(_x)
 145 #define __be64_to_cpu(_x) bswap_64(_x)
 146 #elif BYTE_ORDER == BIG_ENDIAN
 147 #define __cpu_to_le16(_x) bswap_16(_x)
 148 #define __cpu_to_le32(_x) bswap_32(_x)
 149 #define __cpu_to_le64(_x) bswap_64(_x)
 150 #define __le16_to_cpu(_x) bswap_16(_x)
 151 #define __le32_to_cpu(_x) bswap_32(_x)
 152 #define __le64_to_cpu(_x) bswap_64(_x)
 153
 154 #define __cpu_to_be16(_x) (_x)
 155 #define __cpu_to_be32(_x) (_x)
 156 #define __cpu_to_be64(_x) (_x)
 157 #define __be16_to_cpu(_x) (_x)
 158 #define __be32_to_cpu(_x) (_x)
 159 #define __be64_to_cpu(_x) (_x)
 160 #else
 161 #  error "unknown endianness."
 162 #endif
 163 #endif /* __KLIBC__ */
 164
 165
 166 /*
 167  * min()/max()/clamp() macros that also do
 168  * strict type-checking.. See the
 169  * "unnecessary" pointer comparison.
 170  */
 171 #define min(x, y) ({                            \
 172         typeof(x) _min1 = (x);                  \
 173         typeof(y) _min2 = (y);                  \
 174         (void) (&_min1 == &_min2);              \
 175         _min1 < _min2 ? _min1 : _min2; })
 176
 177 #define max(x, y) ({                            \
 178         typeof(x) _max1 = (x);                  \
 179         typeof(y) _max2 = (y);                  \
 180         (void) (&_max1 == &_max2);              \
 181         _max1 > _max2 ? _max1 : _max2; })
 182
 183 /* general information that might be extracted from a superblock */
 184 struct mdinfo {
 185         mdu_array_info_t        array;
 186         mdu_disk_info_t         disk;
 187         __u64                   events;
 188         int                     uuid[4];
 189         char                    name[33];
 190         unsigned long long      data_offset;
 191         unsigned long long      component_size; /* same as array.size, except in
 192                                                  * sectors and up to 64bits.
 193                                                  */
 194         unsigned long long      custom_array_size; /* size for non-default sized
 195                                                     * arrays (in sectors)
 196                                                     */
 197 #define NO_RESHAPE              0
 198 #define VOLUME_RESHAPE          1
 199 #define CONTAINER_RESHAPE       2
 200         int                     reshape_active;
 201         unsigned long long      reshape_progress;
 202         int                     recovery_blocked; /* for external metadata it
 203                                                    * indicates that there is
 204                                                    * reshape in progress in
 205                                                    * container,
 206                                                    * for native metadata it is
 207                                                    * reshape_active field mirror
 208                                                    */
 209         union {
 210                 unsigned long long resync_start; /* per-array resync position */
 211                 unsigned long long recovery_start; /* per-device rebuild position */
 212                 #define MaxSector  (~0ULL) /* resync/recovery complete position */
 213         };
 214         long                    bitmap_offset;  /* 0 == none, 1 == a file */
 215         unsigned long           safe_mode_delay; /* ms delay to mark clean */
 216         int                     new_level, delta_disks, new_layout, new_chunk;
 217         int                     errors;
 218         unsigned long           cache_size; /* size of raid456 stripe cache*/
 219         int                     mismatch_cnt;
 220         char                    text_version[50];
 221
 222         int container_member; /* for assembling external-metatdata arrays
 223                                * This is to be used internally by metadata
 224                                * handler only */
 225         int container_enough; /* flag external handlers can set to
 226                                * indicate that subarrays have not enough (-1),
 227                                * enough to start (0), or all expected disks (1) */
 228         char            sys_name[20];
 229         struct mdinfo *devs;
 230         struct mdinfo *next;
 231
 232         /* Device info for mdmon: */
 233         int recovery_fd;
 234         int state_fd;
 235         #define DS_FAULTY       1
 236         #define DS_INSYNC       2
 237         #define DS_WRITE_MOSTLY 4
 238         #define DS_SPARE        8
 239         #define DS_BLOCKED      16
 240         #define DS_REMOVE       1024
 241         #define DS_UNBLOCK      2048
 242         int prev_state, curr_state, next_state;
 243
 244 };
 245
 246 struct createinfo {
 247         int     uid;
 248         int     gid;
 249         int     autof;
 250         int     mode;
 251         int     symlinks;
 252         struct supertype *supertype;
 253 };
 254
 255 #define Name "mdadm"
 256
 257 enum mode {
 258         ASSEMBLE=1,
 259         BUILD,
 260         CREATE,
 261         MANAGE,
 262         MISC,
 263         MONITOR,
 264         GROW,
 265         INCREMENTAL,
 266         AUTODETECT,
 267 };
 268
 269 extern char short_options[];
 270 extern char short_bitmap_options[];
 271 extern char short_bitmap_auto_options[];
 272 extern struct option long_options[];
 273 extern char Version[], Usage[], Help[], OptionHelp[],
 274         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 275         Help_incr[],
 276         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 277
 278 /* for option that don't have short equivilents, we assign arbitrary
 279  * numbers later than any 'short' character option.
 280  */
 281 enum special_options {
 282         AssumeClean = 300,
 283         BitmapChunk,
 284         WriteBehind,
 285         ReAdd,
 286         NoDegraded,
 287         Sparc22,
 288         BackupFile,
 289         HomeHost,
 290         AutoHomeHost,
 291         Symlinks,
 292         AutoDetect,
 293         Waitclean,
 294         DetailPlatform,
 295         KillSubarray,
 296         UpdateSubarray,
 297         IncrementalPath,
 298         NoSharing,
 299         HelpOptions,
 300         Brief,
 301         ManageOpt,
 302         Add,
 303         Remove,
 304         Fail,
 305         MiscOpt,
 306         WaitOpt,
 307         ConfigFile,
 308         ChunkSize,
 309         WriteMostly,
 310         Layout,
 311         Auto,
 312         Force,
 313         SuperMinor,
 314         EMail,
 315         ProgramOpt,
 316         Increment,
 317         Fork,
 318         Bitmap,
 319         RebuildMapOpt,
 320         InvalidBackup,
 321         UdevRules,
 322         FreezeReshape,
 323         Continue,
 324         OffRootOpt,
 325 };
 326
 327 /* structures read from config file */
 328 /* List of mddevice names and identifiers
 329  * Identifiers can be:
 330  *    uuid=128-hex-uuid
 331  *    super-minor=decimal-minor-number-from-superblock
 332  *    devices=comma,separated,list,of,device,names,with,wildcards
 333  *
 334  * If multiple fields are present, the intersection of all matching
 335  * devices is considered
 336  */
 337 #define UnSet (0xfffe)
 338 struct mddev_ident {
 339         char    *devname;
 340
 341         int     uuid_set;
 342         int     uuid[4];
 343         char    name[33];
 344
 345         int super_minor;
 346
 347         char    *devices;       /* comma separated list of device
 348                                  * names with wild cards
 349                                  */
 350         int     level;
 351         int raid_disks;
 352         int spare_disks;
 353         struct supertype *st;
 354         int     autof;          /* 1 for normal, 2 for partitioned */
 355         char    *spare_group;
 356         char    *bitmap_file;
 357         int     bitmap_fd;
 358
 359         char    *container;     /* /dev/whatever name of container, or
 360                                  * uuid of container.  You would expect
 361                                  * this to be the 'devname' or UUID
 362                                  * of some other entry.
 363                                  */
 364         char    *member;        /* subarray within a container */
 365
 366         struct mddev_ident *next;
 367         union {
 368                 /* fields needed by different users of this structure */
 369                 int assembled;  /* set when assembly succeeds */
 370         };
 371 };
 372
 373 /* List of device names - wildcards expanded */
 374 struct mddev_dev {
 375         char *devname;
 376         int disposition;        /* 'a' for add, 'r' for remove, 'f' for fail.
 377                                  * Not set for names read from .config
 378                                  */
 379         char writemostly;       /* 1 for 'set writemostly', 2 for 'clear writemostly' */
 380         char re_add;
 381         char used;              /* set when used */
 382         struct mddev_dev *next;
 383 };
 384
 385 typedef struct mapping {
 386         char *name;
 387         int num;
 388 } mapping_t;
 389
 390
 391 struct mdstat_ent {
 392         char            *dev;
 393         int             devnum;
 394         int             active;
 395         char            *level;
 396         char            *pattern; /* U or up, _ for down */
 397         int             percent; /* -1 if no resync */
 398         int             resync; /* 3 if check, 2 if reshape, 1 if resync, 0 if recovery */
 399         int             devcnt;
 400         int             raid_disks;
 401         char *          metadata_version;
 402         struct dev_member {
 403                 char                    *name;
 404                 struct dev_member       *next;
 405         }               *members;
 406         struct mdstat_ent *next;
 407 };
 408
 409 extern struct mdstat_ent *mdstat_read(int hold, int start);
 410 extern void free_mdstat(struct mdstat_ent *ms);
 411 extern void mdstat_wait(int seconds);
 412 extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
 413 extern int mddev_busy(int devnum);
 414 extern struct mdstat_ent *mdstat_by_component(char *name);
 415 extern struct mdstat_ent *mdstat_by_subdev(char *subdev, int container);
 416
 417 struct map_ent {
 418         struct map_ent *next;
 419         int     devnum;
 420         char    metadata[20];
 421         int     uuid[4];
 422         int     bad;
 423         char    *path;
 424 };
 425 extern int map_update(struct map_ent **mpp, int devnum, char *metadata,
 426                       int uuid[4], char *path);
 427 extern void map_remove(struct map_ent **map, int devnum);
 428 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
 429 extern struct map_ent *map_by_devnum(struct map_ent **map, int devnum);
 430 extern struct map_ent *map_by_name(struct map_ent **map, char *name);
 431 extern void map_read(struct map_ent **melp);
 432 extern int map_write(struct map_ent *mel);
 433 extern void map_delete(struct map_ent **mapp, int devnum);
 434 extern void map_free(struct map_ent *map);
 435 extern void map_add(struct map_ent **melp,
 436                     int devnum, char *metadata, int uuid[4], char *path);
 437 extern int map_lock(struct map_ent **melp);
 438 extern void map_unlock(struct map_ent **melp);
 439 extern void map_fork(void);
 440
 441 /* various details can be requested */
 442 enum sysfs_read_flags {
 443         GET_LEVEL       = (1 << 0),
 444         GET_LAYOUT      = (1 << 1),
 445         GET_COMPONENT   = (1 << 2),
 446         GET_CHUNK       = (1 << 3),
 447         GET_CACHE       = (1 << 4),
 448         GET_MISMATCH    = (1 << 5),
 449         GET_VERSION     = (1 << 6),
 450         GET_DISKS       = (1 << 7),
 451         GET_DEGRADED    = (1 << 8),
 452         GET_SAFEMODE    = (1 << 9),
 453         GET_BITMAP_LOCATION = (1 << 10),
 454
 455         GET_DEVS        = (1 << 20), /* gets role, major, minor */
 456         GET_OFFSET      = (1 << 21),
 457         GET_SIZE        = (1 << 22),
 458         GET_STATE       = (1 << 23),
 459         GET_ERROR       = (1 << 24),
 460 };
 461
 462 /* If fd >= 0, get the array it is open on,
 463  * else use devnum. >=0 -> major9. <0.....
 464  */
 465 extern int sysfs_open(int devnum, char *devname, char *attr);
 466 extern void sysfs_init(struct mdinfo *mdi, int fd, int devnum);
 467 extern void sysfs_free(struct mdinfo *sra);
 468 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
 469 extern int sysfs_attr_match(const char *attr, const char *str);
 470 extern int sysfs_match_word(const char *word, char **list);
 471 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 472                          char *name, char *val);
 473 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 474                          char *name, unsigned long long val);
 475 extern int sysfs_uevent(struct mdinfo *sra, char *event);
 476 extern int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev,
 477                         char *name);
 478 extern int sysfs_fd_get_ll(int fd, unsigned long long *val);
 479 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 480                         char *name, unsigned long long *val);
 481 extern int sysfs_fd_get_str(int fd, char *val, int size);
 482 extern int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev,
 483                                      char *name);
 484 extern int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev,
 485                          char *name, char *val, int size);
 486 extern int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms);
 487 extern int sysfs_set_array(struct mdinfo *info, int vers);
 488 extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume);
 489 extern int sysfs_disk_to_scsi_id(int fd, __u32 *id);
 490 extern int sysfs_unique_holder(int devnum, long rdev);
 491 extern int sysfs_freeze_array(struct mdinfo *sra);
 492 extern int load_sys(char *path, char *buf);
 493 extern int reshape_prepare_fdlist(char *devname,
 494                                   struct mdinfo *sra,
 495                                   int raid_disks,
 496                                   int nrdisks,
 497                                   unsigned long blocks,
 498                                   char *backup_file,
 499                                   int *fdlist,
 500                                   unsigned long long *offsets);
 501 extern void reshape_free_fdlist(int *fdlist,
 502                                 unsigned long long *offsets,
 503                                 int size);
 504 extern int reshape_open_backup_file(char *backup,
 505                                     int fd,
 506                                     char *devname,
 507                                     long blocks,
 508                                     int *fdlist,
 509                                     unsigned long long *offsets,
 510                                     int restart);
 511 extern unsigned long compute_backup_blocks(int nchunk, int ochunk,
 512                                            unsigned int ndata, unsigned int odata);
 513
 514 extern int save_stripes(int *source, unsigned long long *offsets,
 515                         int raid_disks, int chunk_size, int level, int layout,
 516                         int nwrites, int *dest,
 517                         unsigned long long start, unsigned long long length,
 518                         char *buf);
 519 extern int restore_stripes(int *dest, unsigned long long *offsets,
 520                            int raid_disks, int chunk_size, int level, int layout,
 521                            int source, unsigned long long read_offset,
 522                            unsigned long long start, unsigned long long length,
 523                            char *src_buf);
 524
 525 #ifndef Sendmail
 526 #define Sendmail "/usr/lib/sendmail -t"
 527 #endif
 528
 529 #define SYSLOG_FACILITY LOG_DAEMON
 530
 531 extern char *map_num(mapping_t *map, int num);
 532 extern int map_name(mapping_t *map, char *name);
 533 extern mapping_t r5layout[], r6layout[], pers[], modes[], faultylayout[];
 534
 535 extern char *map_dev(int major, int minor, int create);
 536
 537 struct active_array;
 538 struct metadata_update;
 539
 540
 541 /* 'struct reshape' records the intermediate states
 542  * a general reshape.
 543  * The starting geometry is converted to the 'before' geometry
 544  * by at most an atomic level change. They could be the same.
 545  * Similarly the 'after' geometry is converted to the final
 546  * geometry by at most a level change.
 547  * Note that 'before' and 'after' must have the same level.
 548  * 'blocks' is the minimum number of sectors for a reshape unit.
 549  * This will be a multiple of the stripe size in each of the
 550  * 'before' and 'after' geometries.
 551  * If 'blocks' is 0, no restriping is necessary.
 552  */
 553 struct reshape {
 554         int level;
 555         int parity; /* number of parity blocks/devices */
 556         struct {
 557                 int layout;
 558                 int data_disks;
 559         } before, after;
 560         unsigned long long backup_blocks;
 561         unsigned long long stripes; /* number of old stripes that comprise 'blocks'*/
 562         unsigned long long new_size; /* New size of array in sectors */
 563 };
 564
 565 /* A superswitch provides entry point the a metadata handler.
 566  *
 567  * The super_switch primarily operates on some "metadata" that
 568  * is accessed via the 'supertype'.
 569  * This metadata has one of three possible sources.
 570  * 1/ It is read from a single device.  In this case it may not completely
 571  *    describe the array or arrays as some information might be on other
 572  *    devices.
 573  * 2/ It is read from all devices in a container.  In this case all
 574  *    information is present.
 575  * 3/ It is created by ->init_super / ->add_to_super.  In this case it will
 576  *    be complete once enough ->add_to_super calls have completed.
 577  *
 578  * When creating an array inside a container, the metadata will be
 579  * formed by a combination of 2 and 3.  The metadata or the array is read,
 580  * then new information is added.
 581  *
 582  * The metadata must sometimes have a concept of a 'current' array
 583  * and a 'current' device.
 584  * The 'current' array is set by init_super to be the newly created array,
 585  * or is set by super_by_fd when it finds it is looking at an array inside
 586  * a container.
 587  *
 588  * The 'current' device is either the device that the metadata was read from
 589  * in case 1, or the last device added by add_to_super in case 3.
 590  * Case 2 does not identify a 'current' device.
 591  */
 592 extern struct superswitch {
 593
 594         /* Used to report details of metadata read from a component
 595          * device. ->load_super has been called.
 596          */
 597         void (*examine_super)(struct supertype *st, char *homehost);
 598         void (*brief_examine_super)(struct supertype *st, int verbose);
 599         void (*brief_examine_subarrays)(struct supertype *st, int verbose);
 600         void (*export_examine_super)(struct supertype *st);
 601
 602         /* Used to report details of an active array.
 603          * ->load_super was possibly given a 'component' string.
 604          */
 605         void (*detail_super)(struct supertype *st, char *homehost);
 606         void (*brief_detail_super)(struct supertype *st);
 607         void (*export_detail_super)(struct supertype *st);
 608
 609         /* Optional: platform hardware / firmware details */
 610         int (*detail_platform)(int verbose, int enumerate_only);
 611
 612         /* Used:
 613          *   to get uuid to storing in bitmap metadata
 614          *   and 'reshape' backup-data metadata
 615          *   To see if a device is being re-added to an array it was part of.
 616          */
 617         void (*uuid_from_super)(struct supertype *st, int uuid[4]);
 618
 619         /* Extract generic details from metadata.  This could be details about
 620          * the container, or about an individual array within the container.
 621          * The determination is made either by:
 622          *   load_super being given a 'component' string.
 623          *   validate_geometry determining what to create.
 624          * The info includes both array information and device information.
 625          * The particular device should be:
 626          *   The last device added by add_to_super
 627          *   The device the metadata was loaded from by load_super
 628          * If 'map' is present, then it is an array raid_disks long
 629          * (raid_disk must already be set and correct) and it is filled
 630          * with 1 for slots that are thought to be active and 0 for slots which
 631          * appear to be failed/missing.
 632          * *info is zeroed out before data is added.
 633          */
 634         void (*getinfo_super)(struct supertype *st, struct mdinfo *info, char *map);
 635         struct mdinfo *(*getinfo_super_disks)(struct supertype *st);
 636         /* Check if the given metadata is flagged as belonging to "this"
 637          * host.  0 for 'no', 1 for 'yes', -1 for "Don't record homehost"
 638          */
 639         int (*match_home)(struct supertype *st, char *homehost);
 640
 641         /* Make one of several generic modifications to metadata
 642          * prior to assembly (or other times).
 643          *   sparc2.2  - first bug in early 0.90 metadata
 644          *   super-minor - change name of 0.90 metadata
 645          *   summaries - 'correct' any redundant data
 646          *   resync - mark array as dirty to trigger a resync.
 647          *   uuid - set new uuid - only 0.90 or 1.x
 648          *   name - change the name of the array (where supported)
 649          *   homehost - change which host this array is tied to.
 650          *   devicesize - If metadata is at start of device, change recorded
 651          *               device size to match actual device size
 652          *   byteorder - swap bytes for 0.90 metadata
 653          *
 654          *   force-one  - mark that device as uptodate, not old or failed.
 655          *   force-array - mark array as clean if it would not otherwise
 656          *               assemble
 657          *   assemble   - not sure how this is different from force-one...
 658          *   linear-grow-new - add a new device to a linear array, but don't
 659          *                   change the size: so superblock still matches
 660          *   linear-grow-update - now change the size of the array.
 661          *   writemostly - set the WriteMostly1 bit in the superblock devflags
 662          *   readwrite - clear the WriteMostly1 bit in the superblock devflags
 663          */
 664         int (*update_super)(struct supertype *st, struct mdinfo *info,
 665                             char *update,
 666                             char *devname, int verbose,
 667                             int uuid_set, char *homehost);
 668
 669         /* Create new metadata for new array as described.  This could
 670          * be a new container, or an array in a pre-existing container.
 671          * Also used to zero metadata prior to writing it to invalidate old
 672          * metadata.
 673          */
 674         int (*init_super)(struct supertype *st, mdu_array_info_t *info,
 675                           unsigned long long size, char *name,
 676                           char *homehost, int *uuid);
 677
 678         /* update the metadata to include new device, either at create or
 679          * when hot-adding a spare.
 680          */
 681         int (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
 682                             int fd, char *devname);
 683         /* update the metadata to delete a device,
 684          * when hot-removing.
 685          */
 686         int (*remove_from_super)(struct supertype *st, mdu_disk_info_t *dinfo);
 687
 688         /* Write metadata to one device when fixing problems or adding
 689          * a new device.
 690          */
 691         int (*store_super)(struct supertype *st, int fd);
 692
 693         /*  Write all metadata for this array.
 694          */
 695         int (*write_init_super)(struct supertype *st);
 696         int (*compare_super)(struct supertype *st, struct supertype *tst);
 697         int (*load_super)(struct supertype *st, int fd, char *devname);
 698         int (*load_container)(struct supertype *st, int fd, char *devname);
 699         struct supertype * (*match_metadata_desc)(char *arg);
 700         __u64 (*avail_size)(struct supertype *st, __u64 size);
 701         unsigned long long (*min_acceptable_spare_size)(struct supertype *st);
 702         int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
 703                                    int delay, int write_behind,
 704                                    unsigned long long size, int may_change, int major);
 705         void (*locate_bitmap)(struct supertype *st, int fd);
 706         int (*write_bitmap)(struct supertype *st, int fd);
 707         void (*free_super)(struct supertype *st);
 708
 709         /* validate_geometry is called with an st returned by
 710          * match_metadata_desc.
 711          * It should check that the geometry described in compatible with
 712          * the metadata type.  It will be called repeatedly as devices
 713          * added to validate changing size and new devices.  If there are
 714          * inter-device dependencies, it should record sufficient details
 715          * so these can be validated.
 716          * Both 'size' and '*freesize' are in sectors.  chunk is KiB.
 717          * Return value is:
 718          *  1: everything is OK
 719          *  0: not OK for some reason - if 'verbose', then error was reported.
 720          * -1: st->sb was NULL, 'subdev' is a member of a container of this
 721          *     types, but array is not acceptable for some reason
 722          *     message was reported even if verbose is 0.
 723          */
 724         int (*validate_geometry)(struct supertype *st, int level, int layout,
 725                                  int raiddisks,
 726                                  int *chunk, unsigned long long size,
 727                                  char *subdev, unsigned long long *freesize,
 728                                  int verbose);
 729
 730         struct mdinfo *(*container_content)(struct supertype *st, char *subarray);
 731         /* query the supertype for default geometry */
 732         void (*default_geometry)(struct supertype *st, int *level, int *layout, int *chunk); /* optional */
 733         /* Permit subarray's to be deleted from inactive containers */
 734         int (*kill_subarray)(struct supertype *st); /* optional */
 735         /* Permit subarray's to be modified */
 736         int (*update_subarray)(struct supertype *st, char *subarray,
 737                                char *update, struct mddev_ident *ident); /* optional */
 738         /* Check if reshape is supported for this external format.
 739          * st is obtained from super_by_fd() where st->subarray[0] is
 740          * initialized to indicate if reshape is being performed at the
 741          * container or subarray level
 742          */
 743         int (*reshape_super)(struct supertype *st, long long size, int level,
 744                              int layout, int chunksize, int raid_disks,
 745                              int delta_disks, char *backup, char *dev,
 746                              int verbose); /* optional */
 747         int (*manage_reshape)( /* optional */
 748                 int afd, struct mdinfo *sra, struct reshape *reshape,
 749                 struct supertype *st, unsigned long blocks,
 750                 int *fds, unsigned long long *offsets,
 751                 int dests, int *destfd, unsigned long long *destoffsets);
 752
 753 /* for mdmon */
 754         int (*open_new)(struct supertype *c, struct active_array *a,
 755                         char *inst);
 756
 757         /* Tell the metadata handler the current state of the array.
 758          * This covers whether it is known to be consistent (no pending writes)
 759          * and how far along a resync is known to have progressed
 760          * (in a->resync_start).
 761          * resync status is really irrelevant if the array is not consistent,
 762          * but some metadata (DDF!) have a place to record the distinction.
 763          * If 'consistent' is '2', then the array can mark it dirty if a
 764          * resync/recovery/whatever is required, or leave it clean if not.
 765          * Return value is 0 dirty (not consistent) and 1 if clean.
 766          * it is only really important if consistent is passed in as '2'.
 767          */
 768         int (*set_array_state)(struct active_array *a, int consistent);
 769
 770         /* When the state of a device might have changed, we call set_disk to
 771          * tell the metadata what the current state is.
 772          * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
 773          * transitions.
 774          * set_disk might be called when the state of the particular disk has
 775          * not in fact changed.
 776          */
 777         void (*set_disk)(struct active_array *a, int n, int state);
 778         void (*sync_metadata)(struct supertype *st);
 779         void (*process_update)(struct supertype *st,
 780                                struct metadata_update *update);
 781         void (*prepare_update)(struct supertype *st,
 782                                struct metadata_update *update);
 783
 784         /* activate_spare will check if the array is degraded and, if it
 785          * is, try to find some spare space in the container.
 786          * On success, it add appropriate updates (For process_update) to
 787          * to the 'updates' list and returns a list of 'mdinfo' identifying
 788          * the device, or devices as there might be multiple missing
 789          * devices and multiple spares available.
 790          */
 791         struct mdinfo *(*activate_spare)(struct active_array *a,
 792                                          struct metadata_update **updates);
 793         /*
 794          * Return statically allocated string that represents metadata specific
 795          * controller domain of the disk. The domain is used in disk domain
 796          * matching functions. Disks belong to the same domain if the they have
 797          * the same domain from mdadm.conf and belong the same metadata domain.
 798          * Returning NULL or not providing this handler means that metadata
 799          * does not distinguish the differences between disks that belong to
 800          * different controllers. They are in the domain specified by
 801          * configuration file (mdadm.conf).
 802          * In case when the metadata has the notion of domains based on disk
 803          * it shall return NULL for disks that do not belong to the controller
 804          * the supported domains. Such disks will form another domain and won't
 805          * be mixed with supported ones.
 806          */
 807         const char *(*get_disk_controller_domain)(const char *path);
 808
 809         /* for external backup area */
 810         int (*recover_backup)(struct supertype *st, struct mdinfo *info);
 811
 812         int swapuuid; /* true if uuid is bigending rather than hostendian */
 813         int external;
 814         const char *name; /* canonical metadata name */
 815 } *superlist[];
 816
 817 extern struct superswitch super0, super1;
 818 extern struct superswitch super_imsm, super_ddf;
 819 extern struct superswitch mbr, gpt;
 820
 821 struct metadata_update {
 822         int     len;
 823         char    *buf;
 824         void    *space; /* allocated space that monitor will use */
 825         void    **space_list; /* list of allocated spaces that monitor can
 826                                * use or that it returned.
 827                                */
 828         struct metadata_update *next;
 829 };
 830
 831 /* A supertype holds a particular collection of metadata.
 832  * It identifies the metadata type by the superswitch, and the particular
 833  * sub-version of that metadata type.
 834  * metadata read in or created is stored in 'sb' and 'info'.
 835  * There are also fields used by mdmon to track containers.
 836  *
 837  * A supertype may refer to:
 838  *   Just an array, possibly in a container
 839  *   A container, not identifying any particular array
 840  *   Info read from just one device, not yet fully describing the array/container.
 841  *
 842  *
 843  * A supertype is created by:
 844  *   super_by_fd
 845  *   guess_super
 846  *   dup_super
 847  */
 848 struct supertype {
 849         struct superswitch *ss;
 850         int minor_version;
 851         int max_devs;
 852         int container_dev;    /* devnum of container */
 853         void *sb;
 854         void *info;
 855         int ignore_hw_compat; /* used to inform metadata handlers that it should ignore
 856                                  HW/firmware related incompatability to load metadata.
 857                                  Used when examining metadata to display content of disk
 858                                  when user has no hw/firmare compatible system.
 859                               */
 860         struct metadata_update *updates;
 861         struct metadata_update **update_tail;
 862
 863         /* extra stuff used by mdmon */
 864         struct active_array *arrays;
 865         int sock; /* listen to external programs */
 866         int devnum;
 867         char *devname; /* e.g. md0.  This appears in metadata_verison:
 868                         *  external:/md0/12
 869                         */
 870         int devcnt;
 871         int retry_soon;
 872
 873         struct mdinfo *devs;
 874
 875 };
 876
 877 extern struct supertype *super_by_fd(int fd, char **subarray);
 878 enum guess_types { guess_any, guess_array, guess_partitions };
 879 extern struct supertype *guess_super_type(int fd, enum guess_types guess_type);
 880 static inline struct supertype *guess_super(int fd) {
 881         return guess_super_type(fd, guess_any);
 882 }
 883 extern struct supertype *dup_super(struct supertype *st);
 884 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 885 extern int must_be_container(int fd);
 886 extern int dev_size_from_id(dev_t id, unsigned long long *size);
 887 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 888                          mdu_disk_info_t *disk);
 889 void wait_for(char *dev, int fd);
 890
 891 /*
 892  * Data structures for policy management.
 893  * Each device can have a policy structure that lists
 894  * various name/value pairs each possibly with a metadata associated.
 895  * The policy list is sorted by name/value/metadata
 896  */
 897 struct dev_policy {
 898         struct dev_policy *next;
 899         char *name;     /* None of these strings are allocated.  They are
 900                          * all just references to strings which are known
 901                          * to exist elsewhere.
 902                          * name and metadata can be compared by address equality.
 903                          */
 904         const char *metadata;
 905         const char *value;
 906 };
 907
 908 extern char pol_act[], pol_domain[], pol_metadata[], pol_auto[];
 909
 910 /* iterate over the sublist starting at list, having the same
 911  * 'name' as 'list', and matching the given metadata (Where
 912  * NULL matches anything
 913  */
 914 #define pol_for_each(item, list, _metadata)                             \
 915         for (item = list;                                               \
 916              item && item->name == list->name;                          \
 917              item = item->next)                                         \
 918                 if (!(!_metadata || !item->metadata || _metadata == item->metadata)) \
 919                         ; else
 920
 921 /*
 922  * policy records read from mdadm are largely just name-value pairs.
 923  * The names are constants, not strdupped
 924  */
 925 struct pol_rule {
 926         struct pol_rule *next;
 927         char *type;     /* rule_policy or rule_part */
 928         struct rule {
 929                 struct rule *next;
 930                 char *name;
 931                 char *value;
 932                 char *dups; /* duplicates of 'value' with a partNN appended */
 933         } *rule;
 934 };
 935
 936 extern char rule_policy[], rule_part[];
 937 extern char rule_path[], rule_type[];
 938 extern char type_part[], type_disk[];
 939
 940 extern void policyline(char *line, char *type);
 941 extern void policy_add(char *type, ...);
 942 extern void policy_free(void);
 943
 944 extern struct dev_policy *path_policy(char *path, char *type);
 945 extern struct dev_policy *disk_policy(struct mdinfo *disk);
 946 extern struct dev_policy *devnum_policy(int dev);
 947 extern void dev_policy_free(struct dev_policy *p);
 948
 949 //extern void pol_new(struct dev_policy **pol, char *name, char *val, char *metadata);
 950 extern void pol_add(struct dev_policy **pol, char *name, char *val, char *metadata);
 951 extern struct dev_policy *pol_find(struct dev_policy *pol, char *name);
 952
 953 enum policy_action {
 954         act_default,
 955         act_include,
 956         act_re_add,
 957         act_spare,      /* This only applies to bare devices */
 958         act_spare_same_slot, /* this allows non-bare devices,
 959                               * but only if recent removal */
 960         act_force_spare, /* this allow non-bare devices in any case */
 961         act_err
 962 };
 963
 964 extern int policy_action_allows(struct dev_policy *plist, const char *metadata,
 965                                 enum policy_action want);
 966 extern int disk_action_allows(struct mdinfo *disk, const char *metadata,
 967                               enum policy_action want);
 968
 969 struct domainlist {
 970         struct domainlist *next;
 971         const char *dom;
 972 };
 973
 974 extern int domain_test(struct domainlist *dom, struct dev_policy *pol,
 975                        const char *metadata);
 976 extern struct domainlist *domain_from_array(struct mdinfo *mdi,
 977                                             const char *metadata);
 978 extern void domainlist_add_dev(struct domainlist **dom, int devnum,
 979                                const char *metadata);
 980 extern void domain_free(struct domainlist *dl);
 981 extern void domain_merge(struct domainlist **domp, struct dev_policy *pol,
 982                          const char *metadata);
 983 void domain_add(struct domainlist **domp, char *domain);
 984
 985 extern void policy_save_path(char *id_path, struct map_ent *array);
 986 extern int policy_check_path(struct mdinfo *disk, struct map_ent *array);
 987
 988 #if __GNUC__ < 3
 989 struct stat64;
 990 #endif
 991
 992 #define HAVE_NFTW  we assume
 993 #define HAVE_FTW
 994
 995 #ifdef __UCLIBC__
 996 # include <features.h>
 997 # ifndef __UCLIBC_HAS_LFS__
 998 #  define lseek64 lseek
 999 # endif
1000 # ifndef  __UCLIBC_HAS_FTW__
1001 #  undef HAVE_FTW
1002 #  undef HAVE_NFTW
1003 # endif
1004 #endif
1005
1006 #ifdef __dietlibc__
1007 # undef HAVE_NFTW
1008 #endif
1009
1010 #if defined(__KLIBC__)
1011 # undef HAVE_NFTW
1012 # undef HAVE_FTW
1013 #endif
1014
1015 #ifndef HAVE_NFTW
1016 # define FTW_PHYS 1
1017 # ifndef HAVE_FTW
1018   struct FTW {};
1019 # endif
1020 #endif
1021
1022 #ifdef HAVE_FTW
1023 # include <ftw.h>
1024 #endif
1025
1026 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
1027
1028
1029 extern int Manage_ro(char *devname, int fd, int readonly);
1030 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
1031 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
1032 extern int Manage_subdevs(char *devname, int fd,
1033                           struct mddev_dev *devlist, int verbose, int test,
1034                           char *update, int force);
1035 extern int autodetect(void);
1036 extern int Grow_Add_device(char *devname, int fd, char *newdev);
1037 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
1038 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
1039                         long long size,
1040                         int level, char *layout_str, int chunksize, int raid_disks,
1041                         struct mddev_dev *devlist,
1042                         int assume_clean, int force);
1043 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
1044                         int *fdlist, int cnt, char *backup_file, int verbose);
1045 extern int Grow_continue(int mdfd, struct supertype *st,
1046                          struct mdinfo *info, char *backup_file,
1047                          int freeze_reshape);
1048
1049 extern int restore_backup(struct supertype *st,
1050                           struct mdinfo *content,
1051                           int working_disks,
1052                           int spares,
1053                           char *backup_file,
1054                           int verbose);
1055 extern int Grow_continue_command(char *devname, int fd,
1056                                  char *backup_file, int verbose);
1057
1058 extern int Assemble(struct supertype *st, char *mddev,
1059                     struct mddev_ident *ident,
1060                     struct mddev_dev *devlist,
1061                     char *backup_file, int invalid_backup,
1062                     int readonly, int runstop,
1063                     char *update, char *homehost, int require_homehost,
1064                     int verbose, int force, int freeze_reshape);
1065
1066 extern int Build(char *mddev, int chunk, int level, int layout,
1067                  int raiddisks, struct mddev_dev *devlist, int assume_clean,
1068                  char *bitmap_file, int bitmap_chunk, int write_behind,
1069                  int delay, int verbose, int autof, unsigned long long size);
1070
1071
1072 extern int Create(struct supertype *st, char *mddev,
1073                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
1074                   char *name, char *homehost, int *uuid,
1075                   int subdevs, struct mddev_dev *devlist,
1076                   int runstop, int verbose, int force, int assume_clean,
1077                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int autof);
1078
1079 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
1080 extern int Detail_Platform(struct superswitch *ss, int scan, int verbose);
1081 extern int Query(char *dev);
1082 extern int Examine(struct mddev_dev *devlist, int brief, int export, int scan,
1083                    int SparcAdjust, struct supertype *forcest, char *homehost);
1084 extern int Monitor(struct mddev_dev *devlist,
1085                    char *mailaddr, char *alert_cmd,
1086                    int period, int daemonise, int scan, int oneshot,
1087                    int dosyslog, int test, char *pidfile, int increments,
1088                    int share);
1089
1090 extern int Kill(char *dev, struct supertype *st, int force, int quiet, int noexcl);
1091 extern int Kill_subarray(char *dev, char *subarray, int quiet);
1092 extern int Update_subarray(char *dev, char *subarray, char *update, struct mddev_ident *ident, int quiet);
1093 extern int Wait(char *dev);
1094 extern int WaitClean(char *dev, int sock, int verbose);
1095
1096 extern int Incremental(char *devname, int verbose, int runstop,
1097                        struct supertype *st, char *homehost, int require_homehost,
1098                        int autof, int freeze_reshape);
1099 extern void RebuildMap(void);
1100 extern int IncrementalScan(int verbose);
1101 extern int IncrementalRemove(char *devname, char *path, int verbose);
1102 extern int CreateBitmap(char *filename, int force, char uuid[16],
1103                         unsigned long chunksize, unsigned long daemon_sleep,
1104                         unsigned long write_behind,
1105                         unsigned long long array_size,
1106                         int major);
1107 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
1108 extern int Write_rules(char *rule_name);
1109 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
1110 extern unsigned long bitmap_sectors(struct bitmap_super_s *bsb);
1111
1112 extern int md_get_version(int fd);
1113 extern int get_linux_version(void);
1114 extern int mdadm_version(char *version);
1115 extern long long parse_size(char *size);
1116 extern int parse_uuid(char *str, int uuid[4]);
1117 extern int parse_layout_10(char *layout);
1118 extern int parse_layout_faulty(char *layout);
1119 extern int check_ext2(int fd, char *name);
1120 extern int check_reiser(int fd, char *name);
1121 extern int check_raid(int fd, char *name);
1122 extern int check_partitions(int fd, char *dname,
1123                             unsigned long long freesize,
1124                             unsigned long long size);
1125
1126 extern int get_mdp_major(void);
1127 extern int dev_open(char *dev, int flags);
1128 extern int open_dev(int devnum);
1129 extern int open_dev_flags(int devnum, int flags);
1130 extern int open_dev_excl(int devnum);
1131 extern int is_standard(char *dev, int *nump);
1132 extern int same_dev(char *one, char *two);
1133
1134 extern int parse_auto(char *str, char *msg, int config);
1135 extern struct mddev_ident *conf_get_ident(char *dev);
1136 extern struct mddev_dev *conf_get_devs(void);
1137 extern int conf_test_dev(char *devname);
1138 extern int conf_test_metadata(const char *version, struct dev_policy *pol, int is_homehost);
1139 extern struct createinfo *conf_get_create_info(void);
1140 extern void set_conffile(char *file);
1141 extern char *conf_get_mailaddr(void);
1142 extern char *conf_get_mailfrom(void);
1143 extern char *conf_get_program(void);
1144 extern char *conf_get_homehost(int *require_homehostp);
1145 extern char *conf_line(FILE *file);
1146 extern char *conf_word(FILE *file, int allow_key);
1147 extern int conf_name_is_free(char *name);
1148 extern int conf_verify_devnames(struct mddev_ident *array_list);
1149 extern int devname_matches(char *name, char *match);
1150 extern struct mddev_ident *conf_match(struct supertype *st,
1151                                       struct mdinfo *info,
1152                                       char *devname,
1153                                       int verbose, int *rvp);
1154 extern int experimental(void);
1155
1156 extern void free_line(char *line);
1157 extern int match_oneof(char *devices, char *devname);
1158 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
1159 extern const int uuid_zero[4];
1160 extern int same_uuid(int a[4], int b[4], int swapuuid);
1161 extern void copy_uuid(void *a, int b[4], int swapuuid);
1162 extern char *__fname_from_uuid(int id[4], int swap, char *buf, char sep);
1163 extern char *fname_from_uuid(struct supertype *st,
1164                              struct mdinfo *info, char *buf, char sep);
1165 extern unsigned long calc_csum(void *super, int bytes);
1166 extern int enough(int level, int raid_disks, int layout, int clean,
1167                    char *avail);
1168 extern int enough_fd(int fd);
1169 extern int ask(char *mesg);
1170 extern unsigned long long get_component_size(int fd);
1171 extern void remove_partitions(int fd);
1172 extern int test_partition(int fd);
1173 extern int test_partition_from_id(dev_t id);
1174 extern int get_data_disks(int level, int layout, int raid_disks);
1175 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
1176                                    int chunksize, unsigned long long devsize);
1177 extern int flush_metadata_updates(struct supertype *st);
1178 extern void append_metadata_update(struct supertype *st, void *buf, int len);
1179 extern int assemble_container_content(struct supertype *st, int mdfd,
1180                                       struct mdinfo *content, int runstop,
1181                                       char *chosen_name, int verbose,
1182                                       char *backup_file, int freeze_reshape);
1183 extern struct mdinfo *container_choose_spares(struct supertype *st,
1184                                               unsigned long long min_size,
1185                                               struct domainlist *domlist,
1186                                               char *spare_group,
1187                                               const char *metadata, int get_one);
1188 extern int move_spare(char *from_devname, char *to_devname, dev_t devid);
1189 extern int add_disk(int mdfd, struct supertype *st,
1190                     struct mdinfo *sra, struct mdinfo *info);
1191 extern int remove_disk(int mdfd, struct supertype *st,
1192                        struct mdinfo *sra, struct mdinfo *info);
1193 extern int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info);
1194 unsigned long long min_recovery_start(struct mdinfo *array);
1195
1196 extern char *human_size(long long bytes);
1197 extern char *human_size_brief(long long bytes);
1198 extern void print_r10_layout(int layout);
1199
1200 #define NoMdDev (1<<23)
1201 extern int find_free_devnum(int use_partitions);
1202
1203 extern void put_md_name(char *name);
1204 extern char *get_md_name(int dev);
1205
1206 extern char DefaultConfFile[];
1207
1208 extern int create_mddev(char *dev, char *name, int autof, int trustworthy,
1209                         char *chosen);
1210 /* values for 'trustworthy' */
1211 #define LOCAL   1
1212 #define LOCAL_ANY 10
1213 #define FOREIGN 2
1214 #define METADATA 3
1215 extern int open_mddev(char *dev, int report_errors);
1216 extern int open_container(int fd);
1217 extern int is_container_member(struct mdstat_ent *ent, char *devname);
1218 extern int is_subarray_active(char *subarray, char *devname);
1219 extern int open_subarray(char *dev, char *subarray, struct supertype *st, int quiet);
1220 extern struct superswitch *version_to_superswitch(char *vers);
1221
1222 extern int mdmon_running(int devnum);
1223 extern int mdmon_pid(int devnum);
1224 extern int check_env(char *name);
1225 extern __u32 random32(void);
1226 extern int start_mdmon(int devnum);
1227
1228 extern int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
1229                          struct supertype *st, unsigned long stripes,
1230                          int *fds, unsigned long long *offsets,
1231                          int dests, int *destfd, unsigned long long *destoffsets);
1232 void abort_reshape(struct mdinfo *sra);
1233
1234 extern char *devnum2devname(int num);
1235 extern void fmt_devname(char *name, int num);
1236 extern int devname2devnum(char *name);
1237 extern int stat2devnum(struct stat *st);
1238 extern int fd2devnum(int fd);
1239
1240 static inline int dev2major(int d)
1241 {
1242         if (d >= 0)
1243                 return MD_MAJOR;
1244         else
1245                 return get_mdp_major();
1246 }
1247
1248 static inline int dev2minor(int d)
1249 {
1250         if (d >= 0)
1251                 return d;
1252         return (-1-d) << MdpMinorShift;
1253 }
1254
1255 #define _ROUND_UP(val, base)    (((val) + (base) - 1) & ~(base - 1))
1256 #define ROUND_UP(val, base)     _ROUND_UP(val, (typeof(val))(base))
1257 #define ROUND_UP_PTR(ptr, base) ((typeof(ptr)) \
1258                                  (ROUND_UP((unsigned long)(ptr), base)))
1259
1260 static inline int is_subarray(char *vers)
1261 {
1262         /* The version string for a 'subarray' (an array in a container)
1263          * is
1264          *    /containername/componentname    for normal read-write arrays
1265          *    -containername/componentname    for arrays which mdmon must not
1266          *                                    reconfigure.  They might be read-only
1267          *                                    or might be undergoing reshape etc.
1268          * containername is e.g. md0, md_d1
1269          * componentname is dependant on the metadata. e.g. '1' 'S1' ...
1270          */
1271         return (*vers == '/' || *vers == '-');
1272 }
1273
1274 static inline char *to_subarray(struct mdstat_ent *ent, char *container)
1275 {
1276         return &ent->metadata_version[10+strlen(container)+1];
1277 }
1278
1279 #ifdef DEBUG
1280 #define dprintf(fmt, arg...) \
1281         fprintf(stderr, fmt, ##arg)
1282 #else
1283 #define dprintf(fmt, arg...) \
1284         ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
1285 #endif
1286 #include <assert.h>
1287 #include <stdarg.h>
1288 static inline int xasprintf(char **strp, const char *fmt, ...) {
1289         va_list ap;
1290         int ret;
1291         va_start(ap, fmt);
1292         ret = vasprintf(strp, fmt, ap);
1293         va_end(ap);
1294         assert(ret >= 0);
1295         return ret;
1296 }
1297
1298 #define LEVEL_MULTIPATH         (-4)
1299 #define LEVEL_LINEAR            (-1)
1300 #define LEVEL_FAULTY            (-5)
1301
1302 /* kernel module doesn't know about these */
1303 #define LEVEL_CONTAINER         (-100)
1304 #define LEVEL_UNSUPPORTED       (-200)
1305
1306
1307 /* faulty stuff */
1308
1309 #define WriteTransient  0
1310 #define ReadTransient   1
1311 #define WritePersistent 2
1312 #define ReadPersistent  3
1313 #define WriteAll        4 /* doesn't go to device */
1314 #define ReadFixable     5
1315 #define Modes   6
1316
1317 #define ClearErrors     31
1318 #define ClearFaults     30
1319
1320 #define AllPersist      100 /* internal use only */
1321 #define NoPersist       101
1322
1323 #define ModeMask        0x1f
1324 #define ModeShift       5
1325
1326
1327 #ifdef __TINYC__
1328 #undef minor
1329 #undef major
1330 #undef makedev
1331 #define minor(x) ((x)&0xff)
1332 #define major(x) (((x)>>8)&0xff)
1333 #define makedev(M,m) (((M)<<8) | (m))
1334 #endif
1335
1336 /* for raid4/5/6 */
1337 #define ALGORITHM_LEFT_ASYMMETRIC       0
1338 #define ALGORITHM_RIGHT_ASYMMETRIC      1
1339 #define ALGORITHM_LEFT_SYMMETRIC        2
1340 #define ALGORITHM_RIGHT_SYMMETRIC       3
1341
1342 /* Define non-rotating (raid4) algorithms.  These allow
1343  * conversion of raid4 to raid5.
1344  */
1345 #define ALGORITHM_PARITY_0              4 /* P or P,Q are initial devices */
1346 #define ALGORITHM_PARITY_N              5 /* P or P,Q are final devices. */
1347
1348 /* DDF RAID6 layouts differ from md/raid6 layouts in two ways.
1349  * Firstly, the exact positioning of the parity block is slightly
1350  * different between the 'LEFT_*' modes of md and the "_N_*" modes
1351  * of DDF.
1352  * Secondly, or order of datablocks over which the Q syndrome is computed
1353  * is different.
1354  * Consequently we have different layouts for DDF/raid6 than md/raid6.
1355  * These layouts are from the DDFv1.2 spec.
1356  * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but
1357  * leaves RLQ=3 as 'Vendor Specific'
1358  */
1359
1360 #define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */
1361 #define ALGORITHM_ROTATING_N_RESTART    9 /* DDF PRL=6 RLQ=2 */
1362 #define ALGORITHM_ROTATING_N_CONTINUE   10 /*DDF PRL=6 RLQ=3 */
1363
1364
1365 /* For every RAID5 algorithm we define a RAID6 algorithm
1366  * with exactly the same layout for data and parity, and
1367  * with the Q block always on the last device (N-1).
1368  * This allows trivial conversion from RAID5 to RAID6
1369  */
1370 #define ALGORITHM_LEFT_ASYMMETRIC_6     16
1371 #define ALGORITHM_RIGHT_ASYMMETRIC_6    17
1372 #define ALGORITHM_LEFT_SYMMETRIC_6      18
1373 #define ALGORITHM_RIGHT_SYMMETRIC_6     19
1374 #define ALGORITHM_PARITY_0_6            20
1375 #define ALGORITHM_PARITY_N_6            ALGORITHM_PARITY_N
1376
1377 /* Define PATH_MAX in case we don't use glibc or standard library does
1378  * not have PATH_MAX defined. Assume max path length is 4K characters.
1379  */
1380 #ifndef PATH_MAX
1381 #define PATH_MAX        4096
1382 #endif
1383
1384 #define PROCESS_DELAYED -2
1385 #define PROCESS_PENDING -3
1386
1387 extern int __offroot;