mdadm.h

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@cse.unsw.edu.au>
  23  *    Paper: Neil Brown
  24  *           School of Computer Science and Engineering
  25  *           The University of New South Wales
  26  *           Sydney, 2052
  27  *           Australia
  28  */
  29
  30 #define _GNU_SOURCE
  31 #define _FILE_OFFSET_BITS 64
  32 #include        <unistd.h>
  33 #if !defined(__dietlibc__) && !defined(__KLIBC__)
  34 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
  35 #else
  36 # if defined(__NO_STAT64) || __WORDSIZE != 32
  37 # define lseek64 lseek
  38 # endif
  39 #endif
  40
  41 #include        <sys/types.h>
  42 #include        <sys/stat.h>
  43 #include        <stdlib.h>
  44 #include        <time.h>
  45 #include        <sys/time.h>
  46 #include        <getopt.h>
  47 #include        <fcntl.h>
  48 #include        <stdio.h>
  49 #include        <errno.h>
  50 #include        <string.h>
  51 #include        <syslog.h>
  52 #ifdef __dietlibc__
  53 #include        <strings.h>
  54 /* dietlibc has deprecated random and srandom!! */
  55 #define random rand
  56 #define srandom srand
  57 #endif
  58
  59
  60 #include        <linux/kdev_t.h>
  61 /*#include      <linux/fs.h> */
  62 #include        <sys/mount.h>
  63 #include        <asm/types.h>
  64 #include        <sys/ioctl.h>
  65 #define MD_MAJOR 9
  66 #define MdpMinorShift 6
  67
  68 #ifndef BLKGETSIZE64
  69 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  70 #endif
  71
  72 #define DEFAULT_BITMAP_CHUNK 4096
  73 #define DEFAULT_BITMAP_DELAY 5
  74 #define DEFAULT_MAX_WRITE_BEHIND 256
  75
  76 #include        "md_u.h"
  77 #include        "md_p.h"
  78 #include        "bitmap.h"
  79 #include        "msg.h"
  80
  81 #include <endian.h>
  82 /* Redhat don't like to #include <asm/byteorder.h>, and
  83  * some time include <linux/byteorder/xxx_endian.h> isn't enough,
  84  * and there is no standard conversion function so... */
  85 /* And dietlibc doesn't think byteswap is ok, so.. */
  86 /*  #include <byteswap.h> */
  87 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
  88                      ((x) & 0xff00U) >> 8)
  89 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
  90                      ((x) & 0xff000000U) >> 24 | \
  91                      ((x) & 0x0000ff00U) << 8  | \
  92                      ((x) & 0x00ff0000U) >> 8)
  93 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
  94                      ((x) & 0xff00000000000000ULL) >> 56 | \
  95                      ((x) & 0x000000000000ff00ULL) << 40 | \
  96                      ((x) & 0x00ff000000000000ULL) >> 40 | \
  97                      ((x) & 0x0000000000ff0000ULL) << 24 | \
  98                      ((x) & 0x0000ff0000000000ULL) >> 24 | \
  99                      ((x) & 0x00000000ff000000ULL) << 8 | \
 100                      ((x) & 0x000000ff00000000ULL) >> 8)
 101
 102 #if !defined(__KLIBC__)
 103 #if BYTE_ORDER == LITTLE_ENDIAN
 104 #define __cpu_to_le16(_x) (_x)
 105 #define __cpu_to_le32(_x) (_x)
 106 #define __cpu_to_le64(_x) (_x)
 107 #define __le16_to_cpu(_x) (_x)
 108 #define __le32_to_cpu(_x) (_x)
 109 #define __le64_to_cpu(_x) (_x)
 110
 111 #define __cpu_to_be16(_x) bswap_16(_x)
 112 #define __cpu_to_be32(_x) bswap_32(_x)
 113 #define __cpu_to_be64(_x) bswap_64(_x)
 114 #define __be16_to_cpu(_x) bswap_16(_x)
 115 #define __be32_to_cpu(_x) bswap_32(_x)
 116 #define __be64_to_cpu(_x) bswap_64(_x)
 117 #elif BYTE_ORDER == BIG_ENDIAN
 118 #define __cpu_to_le16(_x) bswap_16(_x)
 119 #define __cpu_to_le32(_x) bswap_32(_x)
 120 #define __cpu_to_le64(_x) bswap_64(_x)
 121 #define __le16_to_cpu(_x) bswap_16(_x)
 122 #define __le32_to_cpu(_x) bswap_32(_x)
 123 #define __le64_to_cpu(_x) bswap_64(_x)
 124
 125 #define __cpu_to_be16(_x) (_x)
 126 #define __cpu_to_be32(_x) (_x)
 127 #define __cpu_to_be64(_x) (_x)
 128 #define __be16_to_cpu(_x) (_x)
 129 #define __be32_to_cpu(_x) (_x)
 130 #define __be64_to_cpu(_x) (_x)
 131 #else
 132 #  error "unknown endianness."
 133 #endif
 134 #endif /* __KLIBC__ */
 135
 136
 137
 138 /* general information that might be extracted from a superblock */
 139 struct mdinfo {
 140         mdu_array_info_t        array;
 141         mdu_disk_info_t         disk;
 142         __u64                   events;
 143         int                     uuid[4];
 144         char                    name[33];
 145         unsigned long long      data_offset;
 146         unsigned long long      component_size; /* same as array.size, except in
 147                                                  * sectors and up to 64bits.
 148                                                  */
 149         int                     reshape_active;
 150         unsigned long long      reshape_progress;
 151         unsigned long long      resync_start;
 152         int                     new_level, delta_disks, new_layout, new_chunk;
 153         int                     errors;
 154         int                     cache_size; /* size of raid456 stripe cache*/
 155         int                     mismatch_cnt;
 156         char                    text_version[50];
 157         int container_member; /* for assembling external-metatdata arrays */
 158
 159         char            sys_name[20];
 160         struct mdinfo *devs;
 161         struct mdinfo *next;
 162
 163         /* Device info for mdmon: */
 164         int state_fd;
 165         #define DS_FAULTY       1
 166         #define DS_INSYNC       2
 167         #define DS_WRITE_MOSTLY 4
 168         #define DS_SPARE        8
 169         #define DS_BLOCKED      16
 170         #define DS_REMOVE       1024
 171         int prev_state, curr_state, next_state;
 172
 173 };
 174
 175 struct createinfo {
 176         int     uid;
 177         int     gid;
 178         int     autof;
 179         int     mode;
 180         int     symlinks;
 181         struct supertype *supertype;
 182 };
 183
 184 #define Name "mdadm"
 185
 186 enum mode {
 187         ASSEMBLE=1,
 188         BUILD,
 189         CREATE,
 190         MANAGE,
 191         MISC,
 192         MONITOR,
 193         GROW,
 194         INCREMENTAL,
 195         AUTODETECT,
 196 };
 197
 198 extern char short_options[];
 199 extern char short_bitmap_options[];
 200 extern char short_bitmap_auto_options[];
 201 extern struct option long_options[];
 202 extern char Version[], Usage[], Help[], OptionHelp[],
 203         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 204         Help_incr[],
 205         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 206
 207 /* for option that don't have short equivilents, we assign arbitrary
 208  * small numbers.  '1' means an undecorated option, so we start at '2'.
 209  */
 210 enum special_options {
 211         AssumeClean = 2,
 212         BitmapChunk,
 213         WriteBehind,
 214         ReAdd,
 215         NoDegraded,
 216         Sparc22,
 217         BackupFile,
 218         HomeHost,
 219         AutoHomeHost,
 220         Symlinks,
 221         AutoDetect,
 222 };
 223
 224 /* structures read from config file */
 225 /* List of mddevice names and identifiers
 226  * Identifiers can be:
 227  *    uuid=128-hex-uuid
 228  *    super-minor=decimal-minor-number-from-superblock
 229  *    devices=comma,separated,list,of,device,names,with,wildcards
 230  *
 231  * If multiple fields are present, the intersection of all matching
 232  * devices is considered
 233  */
 234 #define UnSet (0xfffe)
 235 typedef struct mddev_ident_s {
 236         char    *devname;
 237
 238         int     uuid_set;
 239         int     uuid[4];
 240         char    name[33];
 241
 242         unsigned int super_minor;
 243
 244         char    *devices;       /* comma separated list of device
 245                                  * names with wild cards
 246                                  */
 247         int     level;
 248         unsigned int raid_disks;
 249         unsigned int spare_disks;
 250         struct supertype *st;
 251         int     autof;          /* 1 for normal, 2 for partitioned */
 252         char    *spare_group;
 253         char    *bitmap_file;
 254         int     bitmap_fd;
 255
 256         struct mddev_ident_s *next;
 257 } *mddev_ident_t;
 258
 259 /* List of device names - wildcards expanded */
 260 typedef struct mddev_dev_s {
 261         char *devname;
 262         char disposition;       /* 'a' for add, 'r' for remove, 'f' for fail.
 263                                  * Not set for names read from .config
 264                                  */
 265         char writemostly;
 266         char re_add;
 267         char used;              /* set when used */
 268         struct mddev_dev_s *next;
 269 } *mddev_dev_t;
 270
 271 typedef struct mapping {
 272         char *name;
 273         int num;
 274 } mapping_t;
 275
 276
 277 struct mdstat_ent {
 278         char            *dev;
 279         int             devnum;
 280         int             active;
 281         char            *level;
 282         char            *pattern; /* U or up, _ for down */
 283         int             percent; /* -1 if no resync */
 284         int             resync; /* 1 if resync, 0 if recovery */
 285         int             devcnt;
 286         int             raid_disks;
 287         int             chunk_size;
 288         char *          metadata_version;
 289         struct mdstat_ent *next;
 290 };
 291
 292 extern struct mdstat_ent *mdstat_read(int hold, int start);
 293 extern void free_mdstat(struct mdstat_ent *ms);
 294 extern void mdstat_wait(int seconds);
 295 extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
 296 extern int mddev_busy(int devnum);
 297
 298 struct map_ent {
 299         struct map_ent *next;
 300         int     devnum;
 301         int     major,minor;
 302         int     uuid[4];
 303         char    *path;
 304 };
 305 extern int map_update(struct map_ent **mpp, int devnum, int major, int minor,
 306                       int uuid[4], char *path);
 307 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
 308 extern void map_read(struct map_ent **melp);
 309 extern int map_write(struct map_ent *mel);
 310 extern void map_delete(struct map_ent **mapp, int devnum);
 311 extern void map_free(struct map_ent *map);
 312 extern void map_add(struct map_ent **melp,
 313                     int devnum, int major, int minor, int uuid[4], char *path);
 314
 315 /* various details can be requested */
 316 #define GET_LEVEL       1
 317 #define GET_LAYOUT      2
 318 #define GET_COMPONENT   4
 319 #define GET_CHUNK       8
 320 #define GET_CACHE       16
 321 #define GET_MISMATCH    32
 322 #define GET_VERSION     64
 323 #define GET_DISKS       128
 324
 325 #define GET_DEVS        1024 /* gets role, major, minor */
 326 #define GET_OFFSET      2048
 327 #define GET_SIZE        4096
 328 #define GET_STATE       8192
 329 #define GET_ERROR       16384
 330
 331 /* If fd >= 0, get the array it is open on,
 332  * else use devnum. >=0 -> major9. <0.....
 333  */
 334 extern int sysfs_open(int devnum, char *devname, char *attr);
 335 extern void sysfs_free(struct mdinfo *sra);
 336 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
 337 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 338                          char *name, char *val);
 339 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 340                          char *name, unsigned long long val);
 341 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 342                         char *name, unsigned long long *val);
 343 extern int sysfs_set_array(struct mdinfo *sra,
 344                            struct mdinfo *info);
 345 extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd);
 346
 347
 348
 349
 350 extern int save_stripes(int *source, unsigned long long *offsets,
 351                         int raid_disks, int chunk_size, int level, int layout,
 352                         int nwrites, int *dest,
 353                         unsigned long long start, unsigned long long length);
 354 extern int restore_stripes(int *dest, unsigned long long *offsets,
 355                            int raid_disks, int chunk_size, int level, int layout,
 356                            int source, unsigned long long read_offset,
 357                            unsigned long long start, unsigned long long length);
 358
 359 #ifndef Sendmail
 360 #define Sendmail "/usr/lib/sendmail -t"
 361 #endif
 362
 363 #define SYSLOG_FACILITY LOG_DAEMON
 364
 365 extern char *map_num(mapping_t *map, int num);
 366 extern int map_name(mapping_t *map, char *name);
 367 extern mapping_t r5layout[], pers[], modes[], faultylayout[];
 368
 369 extern char *map_dev(int major, int minor, int create);
 370
 371 struct active_array;
 372
 373 extern struct superswitch {
 374         void (*examine_super)(struct supertype *st, char *homehost);
 375         void (*brief_examine_super)(struct supertype *st);
 376         void (*export_examine_super)(struct supertype *st);
 377         void (*detail_super)(struct supertype *st, char *homehost);
 378         void (*brief_detail_super)(struct supertype *st);
 379         void (*export_detail_super)(struct supertype *st);
 380         void (*uuid_from_super)(struct supertype *st, int uuid[4]);
 381         void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
 382         void (*getinfo_super_n)(struct supertype *st, struct mdinfo *info);
 383         int (*match_home)(struct supertype *st, char *homehost);
 384         int (*update_super)(struct supertype *st, struct mdinfo *info,
 385                             char *update,
 386                             char *devname, int verbose,
 387                             int uuid_set, char *homehost);
 388         int (*init_super)(struct supertype *st, mdu_array_info_t *info,
 389                           unsigned long long size, char *name,
 390                           char *homehost, int *uuid);
 391         void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
 392                              int fd, char *devname);
 393         int (*store_super)(struct supertype *st, int fd);
 394         int (*write_init_super)(struct supertype *st);
 395         int (*compare_super)(struct supertype *st, struct supertype *tst);
 396         int (*load_super)(struct supertype *st, int fd, char *devname);
 397         struct supertype * (*match_metadata_desc)(char *arg);
 398         __u64 (*avail_size)(struct supertype *st, __u64 size);
 399         int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
 400                                    int delay, int write_behind,
 401                                    unsigned long long size, int may_change, int major);
 402         void (*locate_bitmap)(struct supertype *st, int fd);
 403         int (*write_bitmap)(struct supertype *st, int fd);
 404         void (*free_super)(struct supertype *st);
 405         int (*validate_geometry)(struct supertype *st, int level, int layout,
 406                                  int raiddisks,
 407                                  int chunk, unsigned long long size,
 408                                  char *subdev, unsigned long long *freesize);
 409
 410         struct mdinfo *(*container_content)(struct supertype *st);
 411
 412 /* for mdmon */
 413         int (*open_new)(struct supertype *c, struct active_array *a, int inst);
 414
 415         /* Tell the metadata handler the current state of the array.
 416          * This covers whether it is known to be consistent (no pending writes)
 417          * when how far along a resync is known to have progressed
 418          * (in a->resync_start).
 419          * resync status is really irrelevant if the array is not consistent,
 420          * but some metadata (DDF!) have a place to record the distinction.
 421          */
 422         void (*set_array_state)(struct active_array *a, int consistent);
 423
 424         /* When the state of a device might have changed, we call set_disk to
 425          * tell the metadata what the current state is.
 426          * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
 427          * transitions.
 428          * set_disk might be called when the state of the particular disk has
 429          * not in fact changed.
 430          */
 431         void (*set_disk)(struct active_array *a, int n, int state);
 432         void (*sync_metadata)(struct active_array *a);
 433
 434
 435         int major;
 436         int swapuuid; /* true if uuid is bigending rather than hostendian */
 437         int external;
 438 } super0, super1, super_ddf, super_ddf_bvd, super_ddf_svd, *superlist[];
 439
 440 extern struct superswitch super_imsm, super_imsm_raid;
 441
 442 struct supertype {
 443         struct superswitch *ss;
 444         int minor_version;
 445         int max_devs;
 446         int container_dev;    /* devnum of container */
 447         int container_member; /* numerical position in container */
 448         void *sb;
 449         void *info;
 450
 451         /* extra stuff used by mdmon */
 452         struct active_array *arrays;
 453         int sock; /* listen to external programs */
 454         int mgr_pipe[2]; /* communicate between threads */
 455         int mon_pipe[2]; /* communicate between threads */
 456         int devnum;
 457         char *devname; /* e.g. md0.  This appears in metadata_verison:
 458                         *  external:/md0/12
 459                         */
 460         int devcnt;
 461         char *device_name; /* e.g. /dev/md/whatever */
 462
 463         struct mdinfo *devs;
 464
 465 };
 466
 467 extern struct supertype supertype_container_member;
 468 extern struct supertype *super_by_fd(int fd);
 469 extern struct supertype *guess_super(int fd);
 470 extern struct supertype *dup_super(struct supertype *st);
 471 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 472 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 473                          mdu_disk_info_t *disk);
 474
 475 #if __GNUC__ < 3
 476 struct stat64;
 477 #endif
 478
 479 #define HAVE_NFTW  we assume
 480 #define HAVE_FTW
 481
 482 #ifdef UCLIBC
 483 # include <features.h>
 484 # ifndef  __UCLIBC_HAS_FTW__
 485 #  undef HAVE_FTW
 486 #  undef HAVE_NFTW
 487 # endif
 488 #endif
 489
 490 #ifdef __dietlibc__
 491 # undef HAVE_NFTW
 492 #endif
 493
 494 #if defined(__KLIBC__)
 495 # undef HAVE_NFTW
 496 # undef HAVE_FTW
 497 #endif
 498
 499 #ifndef HAVE_NFTW
 500 # define FTW_PHYS 1
 501 # ifndef HAVE_FTW
 502   struct FTW {};
 503 # endif
 504 #endif
 505
 506 #ifdef HAVE_FTW
 507 # include <ftw.h>
 508 #endif
 509
 510 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 511
 512
 513 extern int Manage_ro(char *devname, int fd, int readonly);
 514 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
 515 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
 516 extern int Manage_reconfig(char *devname, int fd, int layout);
 517 extern int Manage_subdevs(char *devname, int fd,
 518                           mddev_dev_t devlist, int verbose);
 519 extern int autodetect(void);
 520 extern int Grow_Add_device(char *devname, int fd, char *newdev);
 521 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
 522 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
 523                         long long size,
 524                         int level, int layout, int chunksize, int raid_disks);
 525 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
 526                         int *fdlist, int cnt, char *backup_file);
 527
 528
 529 extern int Assemble(struct supertype *st, char *mddev, int mdfd,
 530                     mddev_ident_t ident,
 531                     mddev_dev_t devlist, char *backup_file,
 532                     int readonly, int runstop,
 533                     char *update, char *homehost,
 534                     int verbose, int force);
 535
 536 extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
 537                  int raiddisks,
 538                  mddev_dev_t devlist, int assume_clean,
 539                  char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
 540
 541
 542 extern int Create(struct supertype *st, char *mddev, int mdfd,
 543                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
 544                   char *name, char *homehost, int *uuid,
 545                   int subdevs, mddev_dev_t devlist,
 546                   int runstop, int verbose, int force, int assume_clean,
 547                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
 548
 549 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
 550 extern int Query(char *dev);
 551 extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
 552                    int SparcAdjust, struct supertype *forcest, char *homehost);
 553 extern int Monitor(mddev_dev_t devlist,
 554                    char *mailaddr, char *alert_cmd,
 555                    int period, int daemonise, int scan, int oneshot,
 556                    int dosyslog, int test, char *pidfile);
 557
 558 extern int Kill(char *dev, int force, int quiet, int noexcl);
 559 extern int Wait(char *dev);
 560
 561 extern int Incremental(char *devname, int verbose, int runstop,
 562                        struct supertype *st, char *homehost, int autof);
 563 extern int Incremental_container(struct supertype *st, char *devname,
 564                                  int verbose, int runstop, int autof);
 565 extern void RebuildMap(void);
 566 extern int IncrementalScan(int verbose);
 567
 568 extern int CreateBitmap(char *filename, int force, char uuid[16],
 569                         unsigned long chunksize, unsigned long daemon_sleep,
 570                         unsigned long write_behind,
 571                         unsigned long long array_size,
 572                         int major);
 573 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
 574 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
 575
 576 extern int md_get_version(int fd);
 577 extern int get_linux_version(void);
 578 extern int parse_uuid(char *str, int uuid[4]);
 579 extern int check_ext2(int fd, char *name);
 580 extern int check_reiser(int fd, char *name);
 581 extern int check_raid(int fd, char *name);
 582
 583 extern int get_mdp_major(void);
 584 extern int dev_open(char *dev, int flags);
 585 extern int open_dev_excl(int devnum);
 586 extern int is_standard(char *dev, int *nump);
 587
 588 extern int parse_auto(char *str, char *msg, int config);
 589 extern mddev_ident_t conf_get_ident(char *dev);
 590 extern mddev_dev_t conf_get_devs(void);
 591 extern int conf_test_dev(char *devname);
 592 extern struct createinfo *conf_get_create_info(void);
 593 extern void set_conffile(char *file);
 594 extern char *conf_get_mailaddr(void);
 595 extern char *conf_get_mailfrom(void);
 596 extern char *conf_get_program(void);
 597 extern char *conf_get_homehost(void);
 598 extern char *conf_line(FILE *file);
 599 extern char *conf_word(FILE *file, int allow_key);
 600 extern void free_line(char *line);
 601 extern int match_oneof(char *devices, char *devname);
 602 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
 603 extern int same_uuid(int a[4], int b[4], int swapuuid);
 604 extern void copy_uuid(void *a, int b[4], int swapuuid);
 605 extern unsigned long calc_csum(void *super, int bytes);
 606 extern int enough(int level, int raid_disks, int layout, int clean,
 607                    char *avail, int avail_disks);
 608 extern int ask(char *mesg);
 609 extern unsigned long long get_component_size(int fd);
 610 extern void remove_partitions(int fd);
 611 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
 612                                    int chunksize, unsigned long long devsize);
 613
 614
 615 extern char *human_size(long long bytes);
 616 char *human_size_brief(long long bytes);
 617
 618 #define NoMdDev (1<<23)
 619 extern int find_free_devnum(int use_partitions);
 620
 621 extern void put_md_name(char *name);
 622 extern char *get_md_name(int dev);
 623
 624 extern char DefaultConfFile[];
 625
 626 extern int open_mddev(char *dev, int autof);
 627 extern int open_mddev_devnum(char *devname, int devnum, char *name,
 628                              char *chosen_name, int parts);
 629 extern int open_container(int fd);
 630
 631 extern int mdmon_running(int devnum);
 632 extern int signal_mdmon(int devnum);
 633
 634 extern char *devnum2devname(int num);
 635 extern int fd2devnum(int fd);
 636
 637 static inline int dev2major(int d)
 638 {
 639         if (d >= 0)
 640                 return MD_MAJOR;
 641         else
 642                 return get_mdp_major();
 643 }
 644
 645 static inline int dev2minor(int d)
 646 {
 647         if (d >= 0)
 648                 return d;
 649         return (-1-d) << MdpMinorShift;
 650 }
 651
 652 #define LEVEL_MULTIPATH         (-4)
 653 #define LEVEL_LINEAR            (-1)
 654 #define LEVEL_FAULTY            (-5)
 655
 656 /* kernel module doesn't know about these */
 657 #define LEVEL_CONTAINER         (-100)
 658 #define LEVEL_UNSUPPORTED       (-200)
 659
 660
 661 /* faulty stuff */
 662
 663 #define WriteTransient  0
 664 #define ReadTransient   1
 665 #define WritePersistent 2
 666 #define ReadPersistent  3
 667 #define WriteAll        4 /* doesn't go to device */
 668 #define ReadFixable     5
 669 #define Modes   6
 670
 671 #define ClearErrors     31
 672 #define ClearFaults     30
 673
 674 #define AllPersist      100 /* internal use only */
 675 #define NoPersist       101
 676
 677 #define ModeMask        0x1f
 678 #define ModeShift       5
 679
 680
 681 #ifdef __TINYC__
 682 #undef minor
 683 #undef major
 684 #undef makedev
 685 #define minor(x) ((x)&0xff)
 686 #define major(x) (((x)>>8)&0xff)
 687 #define makedev(M,m) (((M)<<8) | (m))
 688 #endif
 689
 690 /* for raid5 */
 691 #define ALGORITHM_LEFT_ASYMMETRIC       0
 692 #define ALGORITHM_RIGHT_ASYMMETRIC      1
 693 #define ALGORITHM_LEFT_SYMMETRIC        2
 694 #define ALGORITHM_RIGHT_SYMMETRIC       3