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 #define APPLY_METADATA_CHANGES          1
 744 #define ROLLBACK_METADATA_CHANGES       0
 745
 746         int (*reshape_super)(struct supertype *st, long long size, int level,
 747                              int layout, int chunksize, int raid_disks,
 748                              int delta_disks, char *backup, char *dev,
 749                              int direction,
 750                              int verbose); /* optional */
 751         int (*manage_reshape)( /* optional */
 752                 int afd, struct mdinfo *sra, struct reshape *reshape,
 753                 struct supertype *st, unsigned long blocks,
 754                 int *fds, unsigned long long *offsets,
 755                 int dests, int *destfd, unsigned long long *destoffsets);
 756
 757 /* for mdmon */
 758         int (*open_new)(struct supertype *c, struct active_array *a,
 759                         char *inst);
 760
 761         /* Tell the metadata handler the current state of the array.
 762          * This covers whether it is known to be consistent (no pending writes)
 763          * and how far along a resync is known to have progressed
 764          * (in a->resync_start).
 765          * resync status is really irrelevant if the array is not consistent,
 766          * but some metadata (DDF!) have a place to record the distinction.
 767          * If 'consistent' is '2', then the array can mark it dirty if a
 768          * resync/recovery/whatever is required, or leave it clean if not.
 769          * Return value is 0 dirty (not consistent) and 1 if clean.
 770          * it is only really important if consistent is passed in as '2'.
 771          */
 772         int (*set_array_state)(struct active_array *a, int consistent);
 773
 774         /* When the state of a device might have changed, we call set_disk to
 775          * tell the metadata what the current state is.
 776          * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
 777          * transitions.
 778          * set_disk might be called when the state of the particular disk has
 779          * not in fact changed.
 780          */
 781         void (*set_disk)(struct active_array *a, int n, int state);
 782         void (*sync_metadata)(struct supertype *st);
 783         void (*process_update)(struct supertype *st,
 784                                struct metadata_update *update);
 785         void (*prepare_update)(struct supertype *st,
 786                                struct metadata_update *update);
 787
 788         /* activate_spare will check if the array is degraded and, if it
 789          * is, try to find some spare space in the container.
 790          * On success, it add appropriate updates (For process_update) to
 791          * to the 'updates' list and returns a list of 'mdinfo' identifying
 792          * the device, or devices as there might be multiple missing
 793          * devices and multiple spares available.
 794          */
 795         struct mdinfo *(*activate_spare)(struct active_array *a,
 796                                          struct metadata_update **updates);
 797         /*
 798          * Return statically allocated string that represents metadata specific
 799          * controller domain of the disk. The domain is used in disk domain
 800          * matching functions. Disks belong to the same domain if the they have
 801          * the same domain from mdadm.conf and belong the same metadata domain.
 802          * Returning NULL or not providing this handler means that metadata
 803          * does not distinguish the differences between disks that belong to
 804          * different controllers. They are in the domain specified by
 805          * configuration file (mdadm.conf).
 806          * In case when the metadata has the notion of domains based on disk
 807          * it shall return NULL for disks that do not belong to the controller
 808          * the supported domains. Such disks will form another domain and won't
 809          * be mixed with supported ones.
 810          */
 811         const char *(*get_disk_controller_domain)(const char *path);
 812
 813         /* for external backup area */
 814         int (*recover_backup)(struct supertype *st, struct mdinfo *info);
 815
 816         int swapuuid; /* true if uuid is bigending rather than hostendian */
 817         int external;
 818         const char *name; /* canonical metadata name */
 819 } *superlist[];
 820
 821 extern struct superswitch super0, super1;
 822 extern struct superswitch super_imsm, super_ddf;
 823 extern struct superswitch mbr, gpt;
 824
 825 struct metadata_update {
 826         int     len;
 827         char    *buf;
 828         void    *space; /* allocated space that monitor will use */
 829         void    **space_list; /* list of allocated spaces that monitor can
 830                                * use or that it returned.
 831                                */
 832         struct metadata_update *next;
 833 };
 834
 835 /* A supertype holds a particular collection of metadata.
 836  * It identifies the metadata type by the superswitch, and the particular
 837  * sub-version of that metadata type.
 838  * metadata read in or created is stored in 'sb' and 'info'.
 839  * There are also fields used by mdmon to track containers.
 840  *
 841  * A supertype may refer to:
 842  *   Just an array, possibly in a container
 843  *   A container, not identifying any particular array
 844  *   Info read from just one device, not yet fully describing the array/container.
 845  *
 846  *
 847  * A supertype is created by:
 848  *   super_by_fd
 849  *   guess_super
 850  *   dup_super
 851  */
 852 struct supertype {
 853         struct superswitch *ss;
 854         int minor_version;
 855         int max_devs;
 856         int container_dev;    /* devnum of container */
 857         void *sb;
 858         void *info;
 859         int ignore_hw_compat; /* used to inform metadata handlers that it should ignore
 860                                  HW/firmware related incompatability to load metadata.
 861                                  Used when examining metadata to display content of disk
 862                                  when user has no hw/firmare compatible system.
 863                               */
 864         struct metadata_update *updates;
 865         struct metadata_update **update_tail;
 866
 867         /* extra stuff used by mdmon */
 868         struct active_array *arrays;
 869         int sock; /* listen to external programs */
 870         int devnum;
 871         char *devname; /* e.g. md0.  This appears in metadata_verison:
 872                         *  external:/md0/12
 873                         */
 874         int devcnt;
 875         int retry_soon;
 876
 877         struct mdinfo *devs;
 878
 879 };
 880
 881 extern struct supertype *super_by_fd(int fd, char **subarray);
 882 enum guess_types { guess_any, guess_array, guess_partitions };
 883 extern struct supertype *guess_super_type(int fd, enum guess_types guess_type);
 884 static inline struct supertype *guess_super(int fd) {
 885         return guess_super_type(fd, guess_any);
 886 }
 887 extern struct supertype *dup_super(struct supertype *st);
 888 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 889 extern int must_be_container(int fd);
 890 extern int dev_size_from_id(dev_t id, unsigned long long *size);
 891 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 892                          mdu_disk_info_t *disk);
 893 void wait_for(char *dev, int fd);
 894
 895 /*
 896  * Data structures for policy management.
 897  * Each device can have a policy structure that lists
 898  * various name/value pairs each possibly with a metadata associated.
 899  * The policy list is sorted by name/value/metadata
 900  */
 901 struct dev_policy {
 902         struct dev_policy *next;
 903         char *name;     /* None of these strings are allocated.  They are
 904                          * all just references to strings which are known
 905                          * to exist elsewhere.
 906                          * name and metadata can be compared by address equality.
 907                          */
 908         const char *metadata;
 909         const char *value;
 910 };
 911
 912 extern char pol_act[], pol_domain[], pol_metadata[], pol_auto[];
 913
 914 /* iterate over the sublist starting at list, having the same
 915  * 'name' as 'list', and matching the given metadata (Where
 916  * NULL matches anything
 917  */
 918 #define pol_for_each(item, list, _metadata)                             \
 919         for (item = list;                                               \
 920              item && item->name == list->name;                          \
 921              item = item->next)                                         \
 922                 if (!(!_metadata || !item->metadata || _metadata == item->metadata)) \
 923                         ; else
 924
 925 /*
 926  * policy records read from mdadm are largely just name-value pairs.
 927  * The names are constants, not strdupped
 928  */
 929 struct pol_rule {
 930         struct pol_rule *next;
 931         char *type;     /* rule_policy or rule_part */
 932         struct rule {
 933                 struct rule *next;
 934                 char *name;
 935                 char *value;
 936                 char *dups; /* duplicates of 'value' with a partNN appended */
 937         } *rule;
 938 };
 939
 940 extern char rule_policy[], rule_part[];
 941 extern char rule_path[], rule_type[];
 942 extern char type_part[], type_disk[];
 943
 944 extern void policyline(char *line, char *type);
 945 extern void policy_add(char *type, ...);
 946 extern void policy_free(void);
 947
 948 extern struct dev_policy *path_policy(char *path, char *type);
 949 extern struct dev_policy *disk_policy(struct mdinfo *disk);
 950 extern struct dev_policy *devnum_policy(int dev);
 951 extern void dev_policy_free(struct dev_policy *p);
 952
 953 //extern void pol_new(struct dev_policy **pol, char *name, char *val, char *metadata);
 954 extern void pol_add(struct dev_policy **pol, char *name, char *val, char *metadata);
 955 extern struct dev_policy *pol_find(struct dev_policy *pol, char *name);
 956
 957 enum policy_action {
 958         act_default,
 959         act_include,
 960         act_re_add,
 961         act_spare,      /* This only applies to bare devices */
 962         act_spare_same_slot, /* this allows non-bare devices,
 963                               * but only if recent removal */
 964         act_force_spare, /* this allow non-bare devices in any case */
 965         act_err
 966 };
 967
 968 extern int policy_action_allows(struct dev_policy *plist, const char *metadata,
 969                                 enum policy_action want);
 970 extern int disk_action_allows(struct mdinfo *disk, const char *metadata,
 971                               enum policy_action want);
 972
 973 struct domainlist {
 974         struct domainlist *next;
 975         const char *dom;
 976 };
 977
 978 extern int domain_test(struct domainlist *dom, struct dev_policy *pol,
 979                        const char *metadata);
 980 extern struct domainlist *domain_from_array(struct mdinfo *mdi,
 981                                             const char *metadata);
 982 extern void domainlist_add_dev(struct domainlist **dom, int devnum,
 983                                const char *metadata);
 984 extern void domain_free(struct domainlist *dl);
 985 extern void domain_merge(struct domainlist **domp, struct dev_policy *pol,
 986                          const char *metadata);
 987 void domain_add(struct domainlist **domp, char *domain);
 988
 989 extern void policy_save_path(char *id_path, struct map_ent *array);
 990 extern int policy_check_path(struct mdinfo *disk, struct map_ent *array);
 991
 992 #if __GNUC__ < 3
 993 struct stat64;
 994 #endif
 995
 996 #define HAVE_NFTW  we assume
 997 #define HAVE_FTW
 998
 999 #ifdef __UCLIBC__
1000 # include <features.h>
1001 # ifndef __UCLIBC_HAS_LFS__
1002 #  define lseek64 lseek
1003 # endif
1004 # ifndef  __UCLIBC_HAS_FTW__
1005 #  undef HAVE_FTW
1006 #  undef HAVE_NFTW
1007 # endif
1008 #endif
1009
1010 #ifdef __dietlibc__
1011 # undef HAVE_NFTW
1012 #endif
1013
1014 #if defined(__KLIBC__)
1015 # undef HAVE_NFTW
1016 # undef HAVE_FTW
1017 #endif
1018
1019 #ifndef HAVE_NFTW
1020 # define FTW_PHYS 1
1021 # ifndef HAVE_FTW
1022   struct FTW {};
1023 # endif
1024 #endif
1025
1026 #ifdef HAVE_FTW
1027 # include <ftw.h>
1028 #endif
1029
1030 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
1031
1032
1033 extern int Manage_ro(char *devname, int fd, int readonly);
1034 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
1035 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
1036 extern int Manage_subdevs(char *devname, int fd,
1037                           struct mddev_dev *devlist, int verbose, int test,
1038                           char *update, int force);
1039 extern int autodetect(void);
1040 extern int Grow_Add_device(char *devname, int fd, char *newdev);
1041 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
1042 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
1043                         long long size,
1044                         int level, char *layout_str, int chunksize, int raid_disks,
1045                         struct mddev_dev *devlist,
1046                         int assume_clean, int force);
1047 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
1048                         int *fdlist, int cnt, char *backup_file, int verbose);
1049 extern int Grow_continue(int mdfd, struct supertype *st,
1050                          struct mdinfo *info, char *backup_file,
1051                          int freeze_reshape);
1052
1053 extern int restore_backup(struct supertype *st,
1054                           struct mdinfo *content,
1055                           int working_disks,
1056                           int spares,
1057                           char *backup_file,
1058                           int verbose);
1059 extern int Grow_continue_command(char *devname, int fd,
1060                                  char *backup_file, int verbose);
1061
1062 extern int Assemble(struct supertype *st, char *mddev,
1063                     struct mddev_ident *ident,
1064                     struct mddev_dev *devlist,
1065                     char *backup_file, int invalid_backup,
1066                     int readonly, int runstop,
1067                     char *update, char *homehost, int require_homehost,
1068                     int verbose, int force, int freeze_reshape);
1069
1070 extern int Build(char *mddev, int chunk, int level, int layout,
1071                  int raiddisks, struct mddev_dev *devlist, int assume_clean,
1072                  char *bitmap_file, int bitmap_chunk, int write_behind,
1073                  int delay, int verbose, int autof, unsigned long long size);
1074
1075
1076 extern int Create(struct supertype *st, char *mddev,
1077                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
1078                   char *name, char *homehost, int *uuid,
1079                   int subdevs, struct mddev_dev *devlist,
1080                   int runstop, int verbose, int force, int assume_clean,
1081                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int autof);
1082
1083 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
1084 extern int Detail_Platform(struct superswitch *ss, int scan, int verbose);
1085 extern int Query(char *dev);
1086 extern int Examine(struct mddev_dev *devlist, int brief, int export, int scan,
1087                    int SparcAdjust, struct supertype *forcest, char *homehost);
1088 extern int Monitor(struct mddev_dev *devlist,
1089                    char *mailaddr, char *alert_cmd,
1090                    int period, int daemonise, int scan, int oneshot,
1091                    int dosyslog, int test, char *pidfile, int increments,
1092                    int share);
1093
1094 extern int Kill(char *dev, struct supertype *st, int force, int quiet, int noexcl);
1095 extern int Kill_subarray(char *dev, char *subarray, int quiet);
1096 extern int Update_subarray(char *dev, char *subarray, char *update, struct mddev_ident *ident, int quiet);
1097 extern int Wait(char *dev);
1098 extern int WaitClean(char *dev, int sock, int verbose);
1099
1100 extern int Incremental(char *devname, int verbose, int runstop,
1101                        struct supertype *st, char *homehost, int require_homehost,
1102                        int autof, int freeze_reshape);
1103 extern void RebuildMap(void);
1104 extern int IncrementalScan(int verbose);
1105 extern int IncrementalRemove(char *devname, char *path, int verbose);
1106 extern int CreateBitmap(char *filename, int force, char uuid[16],
1107                         unsigned long chunksize, unsigned long daemon_sleep,
1108                         unsigned long write_behind,
1109                         unsigned long long array_size,
1110                         int major);
1111 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
1112 extern int Write_rules(char *rule_name);
1113 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
1114 extern unsigned long bitmap_sectors(struct bitmap_super_s *bsb);
1115
1116 extern int md_get_version(int fd);
1117 extern int get_linux_version(void);
1118 extern int mdadm_version(char *version);
1119 extern long long parse_size(char *size);
1120 extern int parse_uuid(char *str, int uuid[4]);
1121 extern int parse_layout_10(char *layout);
1122 extern int parse_layout_faulty(char *layout);
1123 extern int check_ext2(int fd, char *name);
1124 extern int check_reiser(int fd, char *name);
1125 extern int check_raid(int fd, char *name);
1126 extern int check_partitions(int fd, char *dname,
1127                             unsigned long long freesize,
1128                             unsigned long long size);
1129
1130 extern int get_mdp_major(void);
1131 extern int dev_open(char *dev, int flags);
1132 extern int open_dev(int devnum);
1133 extern int open_dev_flags(int devnum, int flags);
1134 extern int open_dev_excl(int devnum);
1135 extern int is_standard(char *dev, int *nump);
1136 extern int same_dev(char *one, char *two);
1137
1138 extern int parse_auto(char *str, char *msg, int config);
1139 extern struct mddev_ident *conf_get_ident(char *dev);
1140 extern struct mddev_dev *conf_get_devs(void);
1141 extern int conf_test_dev(char *devname);
1142 extern int conf_test_metadata(const char *version, struct dev_policy *pol, int is_homehost);
1143 extern struct createinfo *conf_get_create_info(void);
1144 extern void set_conffile(char *file);
1145 extern char *conf_get_mailaddr(void);
1146 extern char *conf_get_mailfrom(void);
1147 extern char *conf_get_program(void);
1148 extern char *conf_get_homehost(int *require_homehostp);
1149 extern char *conf_line(FILE *file);
1150 extern char *conf_word(FILE *file, int allow_key);
1151 extern int conf_name_is_free(char *name);
1152 extern int conf_verify_devnames(struct mddev_ident *array_list);
1153 extern int devname_matches(char *name, char *match);
1154 extern struct mddev_ident *conf_match(struct supertype *st,
1155                                       struct mdinfo *info,
1156                                       char *devname,
1157                                       int verbose, int *rvp);
1158 extern int experimental(void);
1159
1160 extern void free_line(char *line);
1161 extern int match_oneof(char *devices, char *devname);
1162 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
1163 extern const int uuid_zero[4];
1164 extern int same_uuid(int a[4], int b[4], int swapuuid);
1165 extern void copy_uuid(void *a, int b[4], int swapuuid);
1166 extern char *__fname_from_uuid(int id[4], int swap, char *buf, char sep);
1167 extern char *fname_from_uuid(struct supertype *st,
1168                              struct mdinfo *info, char *buf, char sep);
1169 extern unsigned long calc_csum(void *super, int bytes);
1170 extern int enough(int level, int raid_disks, int layout, int clean,
1171                    char *avail);
1172 extern int enough_fd(int fd);
1173 extern int ask(char *mesg);
1174 extern unsigned long long get_component_size(int fd);
1175 extern void remove_partitions(int fd);
1176 extern int test_partition(int fd);
1177 extern int test_partition_from_id(dev_t id);
1178 extern int get_data_disks(int level, int layout, int raid_disks);
1179 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
1180                                    int chunksize, unsigned long long devsize);
1181 extern int flush_metadata_updates(struct supertype *st);
1182 extern void append_metadata_update(struct supertype *st, void *buf, int len);
1183 extern int assemble_container_content(struct supertype *st, int mdfd,
1184                                       struct mdinfo *content, int runstop,
1185                                       char *chosen_name, int verbose,
1186                                       char *backup_file, int freeze_reshape);
1187 extern struct mdinfo *container_choose_spares(struct supertype *st,
1188                                               unsigned long long min_size,
1189                                               struct domainlist *domlist,
1190                                               char *spare_group,
1191                                               const char *metadata, int get_one);
1192 extern int move_spare(char *from_devname, char *to_devname, dev_t devid);
1193 extern int add_disk(int mdfd, struct supertype *st,
1194                     struct mdinfo *sra, struct mdinfo *info);
1195 extern int remove_disk(int mdfd, struct supertype *st,
1196                        struct mdinfo *sra, struct mdinfo *info);
1197 extern int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info);
1198 unsigned long long min_recovery_start(struct mdinfo *array);
1199
1200 extern char *human_size(long long bytes);
1201 extern char *human_size_brief(long long bytes);
1202 extern void print_r10_layout(int layout);
1203
1204 #define NoMdDev (1<<23)
1205 extern int find_free_devnum(int use_partitions);
1206
1207 extern void put_md_name(char *name);
1208 extern char *get_md_name(int dev);
1209
1210 extern char DefaultConfFile[];
1211
1212 extern int create_mddev(char *dev, char *name, int autof, int trustworthy,
1213                         char *chosen);
1214 /* values for 'trustworthy' */
1215 #define LOCAL   1
1216 #define LOCAL_ANY 10
1217 #define FOREIGN 2
1218 #define METADATA 3
1219 extern int open_mddev(char *dev, int report_errors);
1220 extern int open_container(int fd);
1221 extern int is_container_member(struct mdstat_ent *ent, char *devname);
1222 extern int is_subarray_active(char *subarray, char *devname);
1223 extern int open_subarray(char *dev, char *subarray, struct supertype *st, int quiet);
1224 extern struct superswitch *version_to_superswitch(char *vers);
1225
1226 extern int mdmon_running(int devnum);
1227 extern int mdmon_pid(int devnum);
1228 extern int check_env(char *name);
1229 extern __u32 random32(void);
1230 extern int start_mdmon(int devnum);
1231
1232 extern int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
1233                          struct supertype *st, unsigned long stripes,
1234                          int *fds, unsigned long long *offsets,
1235                          int dests, int *destfd, unsigned long long *destoffsets);
1236 void abort_reshape(struct mdinfo *sra);
1237
1238 extern char *devnum2devname(int num);
1239 extern void fmt_devname(char *name, int num);
1240 extern int devname2devnum(char *name);
1241 extern int stat2devnum(struct stat *st);
1242 extern int fd2devnum(int fd);
1243
1244 static inline int dev2major(int d)
1245 {
1246         if (d >= 0)
1247                 return MD_MAJOR;
1248         else
1249                 return get_mdp_major();
1250 }
1251
1252 static inline int dev2minor(int d)
1253 {
1254         if (d >= 0)
1255                 return d;
1256         return (-1-d) << MdpMinorShift;
1257 }
1258
1259 #define _ROUND_UP(val, base)    (((val) + (base) - 1) & ~(base - 1))
1260 #define ROUND_UP(val, base)     _ROUND_UP(val, (typeof(val))(base))
1261 #define ROUND_UP_PTR(ptr, base) ((typeof(ptr)) \
1262                                  (ROUND_UP((unsigned long)(ptr), base)))
1263
1264 static inline int is_subarray(char *vers)
1265 {
1266         /* The version string for a 'subarray' (an array in a container)
1267          * is
1268          *    /containername/componentname    for normal read-write arrays
1269          *    -containername/componentname    for arrays which mdmon must not
1270          *                                    reconfigure.  They might be read-only
1271          *                                    or might be undergoing reshape etc.
1272          * containername is e.g. md0, md_d1
1273          * componentname is dependant on the metadata. e.g. '1' 'S1' ...
1274          */
1275         return (*vers == '/' || *vers == '-');
1276 }
1277
1278 static inline char *to_subarray(struct mdstat_ent *ent, char *container)
1279 {
1280         return &ent->metadata_version[10+strlen(container)+1];
1281 }
1282
1283 #ifdef DEBUG
1284 #define dprintf(fmt, arg...) \
1285         fprintf(stderr, fmt, ##arg)
1286 #else
1287 #define dprintf(fmt, arg...) \
1288         ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
1289 #endif
1290 #include <assert.h>
1291 #include <stdarg.h>
1292 static inline int xasprintf(char **strp, const char *fmt, ...) {
1293         va_list ap;
1294         int ret;
1295         va_start(ap, fmt);
1296         ret = vasprintf(strp, fmt, ap);
1297         va_end(ap);
1298         assert(ret >= 0);
1299         return ret;
1300 }
1301
1302 #define LEVEL_MULTIPATH         (-4)
1303 #define LEVEL_LINEAR            (-1)
1304 #define LEVEL_FAULTY            (-5)
1305
1306 /* kernel module doesn't know about these */
1307 #define LEVEL_CONTAINER         (-100)
1308 #define LEVEL_UNSUPPORTED       (-200)
1309
1310
1311 /* faulty stuff */
1312
1313 #define WriteTransient  0
1314 #define ReadTransient   1
1315 #define WritePersistent 2
1316 #define ReadPersistent  3
1317 #define WriteAll        4 /* doesn't go to device */
1318 #define ReadFixable     5
1319 #define Modes   6
1320
1321 #define ClearErrors     31
1322 #define ClearFaults     30
1323
1324 #define AllPersist      100 /* internal use only */
1325 #define NoPersist       101
1326
1327 #define ModeMask        0x1f
1328 #define ModeShift       5
1329
1330
1331 #ifdef __TINYC__
1332 #undef minor
1333 #undef major
1334 #undef makedev
1335 #define minor(x) ((x)&0xff)
1336 #define major(x) (((x)>>8)&0xff)
1337 #define makedev(M,m) (((M)<<8) | (m))
1338 #endif
1339
1340 /* for raid4/5/6 */
1341 #define ALGORITHM_LEFT_ASYMMETRIC       0
1342 #define ALGORITHM_RIGHT_ASYMMETRIC      1
1343 #define ALGORITHM_LEFT_SYMMETRIC        2
1344 #define ALGORITHM_RIGHT_SYMMETRIC       3
1345
1346 /* Define non-rotating (raid4) algorithms.  These allow
1347  * conversion of raid4 to raid5.
1348  */
1349 #define ALGORITHM_PARITY_0              4 /* P or P,Q are initial devices */
1350 #define ALGORITHM_PARITY_N              5 /* P or P,Q are final devices. */
1351
1352 /* DDF RAID6 layouts differ from md/raid6 layouts in two ways.
1353  * Firstly, the exact positioning of the parity block is slightly
1354  * different between the 'LEFT_*' modes of md and the "_N_*" modes
1355  * of DDF.
1356  * Secondly, or order of datablocks over which the Q syndrome is computed
1357  * is different.
1358  * Consequently we have different layouts for DDF/raid6 than md/raid6.
1359  * These layouts are from the DDFv1.2 spec.
1360  * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but
1361  * leaves RLQ=3 as 'Vendor Specific'
1362  */
1363
1364 #define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */
1365 #define ALGORITHM_ROTATING_N_RESTART    9 /* DDF PRL=6 RLQ=2 */
1366 #define ALGORITHM_ROTATING_N_CONTINUE   10 /*DDF PRL=6 RLQ=3 */
1367
1368
1369 /* For every RAID5 algorithm we define a RAID6 algorithm
1370  * with exactly the same layout for data and parity, and
1371  * with the Q block always on the last device (N-1).
1372  * This allows trivial conversion from RAID5 to RAID6
1373  */
1374 #define ALGORITHM_LEFT_ASYMMETRIC_6     16
1375 #define ALGORITHM_RIGHT_ASYMMETRIC_6    17
1376 #define ALGORITHM_LEFT_SYMMETRIC_6      18
1377 #define ALGORITHM_RIGHT_SYMMETRIC_6     19
1378 #define ALGORITHM_PARITY_0_6            20
1379 #define ALGORITHM_PARITY_N_6            ALGORITHM_PARITY_N
1380
1381 /* Define PATH_MAX in case we don't use glibc or standard library does
1382  * not have PATH_MAX defined. Assume max path length is 4K characters.
1383  */
1384 #ifndef PATH_MAX
1385 #define PATH_MAX        4096
1386 #endif
1387
1388 #define PROCESS_DELAYED -2
1389 #define PROCESS_PENDING -3
1390
1391 extern int __offroot;