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         int prev_state, curr_state, next_state;
 166
 167 };
 168
 169 struct createinfo {
 170         int     uid;
 171         int     gid;
 172         int     autof;
 173         int     mode;
 174         int     symlinks;
 175         struct supertype *supertype;
 176 };
 177
 178 #define Name "mdadm"
 179
 180 enum mode {
 181         ASSEMBLE=1,
 182         BUILD,
 183         CREATE,
 184         MANAGE,
 185         MISC,
 186         MONITOR,
 187         GROW,
 188         INCREMENTAL,
 189         AUTODETECT,
 190 };
 191
 192 extern char short_options[];
 193 extern char short_bitmap_options[];
 194 extern char short_bitmap_auto_options[];
 195 extern struct option long_options[];
 196 extern char Version[], Usage[], Help[], OptionHelp[],
 197         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 198         Help_incr[],
 199         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 200
 201 /* for option that don't have short equivilents, we assign arbitrary
 202  * small numbers.  '1' means an undecorated option, so we start at '2'.
 203  */
 204 enum special_options {
 205         AssumeClean = 2,
 206         BitmapChunk,
 207         WriteBehind,
 208         ReAdd,
 209         NoDegraded,
 210         Sparc22,
 211         BackupFile,
 212         HomeHost,
 213         AutoHomeHost,
 214         Symlinks,
 215         AutoDetect,
 216 };
 217
 218 /* structures read from config file */
 219 /* List of mddevice names and identifiers
 220  * Identifiers can be:
 221  *    uuid=128-hex-uuid
 222  *    super-minor=decimal-minor-number-from-superblock
 223  *    devices=comma,separated,list,of,device,names,with,wildcards
 224  *
 225  * If multiple fields are present, the intersection of all matching
 226  * devices is considered
 227  */
 228 #define UnSet (0xfffe)
 229 typedef struct mddev_ident_s {
 230         char    *devname;
 231
 232         int     uuid_set;
 233         int     uuid[4];
 234         char    name[33];
 235
 236         unsigned int super_minor;
 237
 238         char    *devices;       /* comma separated list of device
 239                                  * names with wild cards
 240                                  */
 241         int     level;
 242         unsigned int raid_disks;
 243         unsigned int spare_disks;
 244         struct supertype *st;
 245         int     autof;          /* 1 for normal, 2 for partitioned */
 246         char    *spare_group;
 247         char    *bitmap_file;
 248         int     bitmap_fd;
 249
 250         struct mddev_ident_s *next;
 251 } *mddev_ident_t;
 252
 253 /* List of device names - wildcards expanded */
 254 typedef struct mddev_dev_s {
 255         char *devname;
 256         char disposition;       /* 'a' for add, 'r' for remove, 'f' for fail.
 257                                  * Not set for names read from .config
 258                                  */
 259         char writemostly;
 260         char re_add;
 261         char used;              /* set when used */
 262         struct mddev_dev_s *next;
 263 } *mddev_dev_t;
 264
 265 typedef struct mapping {
 266         char *name;
 267         int num;
 268 } mapping_t;
 269
 270
 271 struct mdstat_ent {
 272         char            *dev;
 273         int             devnum;
 274         int             active;
 275         char            *level;
 276         char            *pattern; /* U or up, _ for down */
 277         int             percent; /* -1 if no resync */
 278         int             resync; /* 1 if resync, 0 if recovery */
 279         int             devcnt;
 280         int             raid_disks;
 281         int             chunk_size;
 282         char *          metadata_version;
 283         struct mdstat_ent *next;
 284 };
 285
 286 extern struct mdstat_ent *mdstat_read(int hold, int start);
 287 extern void free_mdstat(struct mdstat_ent *ms);
 288 extern void mdstat_wait(int seconds);
 289 extern void mdstat_wait_fd(int fd);
 290 extern int mddev_busy(int devnum);
 291
 292 struct map_ent {
 293         struct map_ent *next;
 294         int     devnum;
 295         int     major,minor;
 296         int     uuid[4];
 297         char    *path;
 298 };
 299 extern int map_update(struct map_ent **mpp, int devnum, int major, int minor,
 300                       int uuid[4], char *path);
 301 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
 302 extern void map_read(struct map_ent **melp);
 303 extern int map_write(struct map_ent *mel);
 304 extern void map_delete(struct map_ent **mapp, int devnum);
 305 extern void map_free(struct map_ent *map);
 306 extern void map_add(struct map_ent **melp,
 307                     int devnum, int major, int minor, int uuid[4], char *path);
 308
 309 /* various details can be requested */
 310 #define GET_LEVEL       1
 311 #define GET_LAYOUT      2
 312 #define GET_COMPONENT   4
 313 #define GET_CHUNK       8
 314 #define GET_CACHE       16
 315 #define GET_MISMATCH    32
 316 #define GET_VERSION     64
 317 #define GET_DISKS       128
 318
 319 #define GET_DEVS        1024 /* gets role, major, minor */
 320 #define GET_OFFSET      2048
 321 #define GET_SIZE        4096
 322 #define GET_STATE       8192
 323 #define GET_ERROR       16384
 324
 325 /* If fd >= 0, get the array it is open on,
 326  * else use devnum. >=0 -> major9. <0.....
 327  */
 328 extern int sysfs_open(int devnum, char *devname, char *attr);
 329 extern void sysfs_free(struct mdinfo *sra);
 330 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
 331 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 332                          char *name, char *val);
 333 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 334                          char *name, unsigned long long val);
 335 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 336                         char *name, unsigned long long *val);
 337 extern int sysfs_set_array(struct mdinfo *sra,
 338                            struct mdinfo *info);
 339 extern int sysfs_add_disk(struct mdinfo *sra, int fd, struct mdinfo *sd);
 340
 341
 342
 343
 344 extern int save_stripes(int *source, unsigned long long *offsets,
 345                         int raid_disks, int chunk_size, int level, int layout,
 346                         int nwrites, int *dest,
 347                         unsigned long long start, unsigned long long length);
 348 extern int restore_stripes(int *dest, unsigned long long *offsets,
 349                            int raid_disks, int chunk_size, int level, int layout,
 350                            int source, unsigned long long read_offset,
 351                            unsigned long long start, unsigned long long length);
 352
 353 #ifndef Sendmail
 354 #define Sendmail "/usr/lib/sendmail -t"
 355 #endif
 356
 357 #define SYSLOG_FACILITY LOG_DAEMON
 358
 359 extern char *map_num(mapping_t *map, int num);
 360 extern int map_name(mapping_t *map, char *name);
 361 extern mapping_t r5layout[], pers[], modes[], faultylayout[];
 362
 363 extern char *map_dev(int major, int minor, int create);
 364
 365 struct active_array;
 366
 367 extern struct superswitch {
 368         void (*examine_super)(struct supertype *st, char *homehost);
 369         void (*brief_examine_super)(struct supertype *st);
 370         void (*export_examine_super)(struct supertype *st);
 371         void (*detail_super)(struct supertype *st, char *homehost);
 372         void (*brief_detail_super)(struct supertype *st);
 373         void (*export_detail_super)(struct supertype *st);
 374         void (*uuid_from_super)(struct supertype *st, int uuid[4]);
 375         void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
 376         void (*getinfo_super_n)(struct supertype *st, struct mdinfo *info);
 377         int (*match_home)(struct supertype *st, char *homehost);
 378         int (*update_super)(struct supertype *st, struct mdinfo *info,
 379                             char *update,
 380                             char *devname, int verbose,
 381                             int uuid_set, char *homehost);
 382         int (*init_super)(struct supertype *st, mdu_array_info_t *info,
 383                           unsigned long long size, char *name,
 384                           char *homehost, int *uuid);
 385         void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
 386                              int fd, char *devname);
 387         int (*store_super)(struct supertype *st, int fd);
 388         int (*write_init_super)(struct supertype *st);
 389         int (*compare_super)(struct supertype *st, struct supertype *tst);
 390         int (*load_super)(struct supertype *st, int fd, char *devname);
 391         struct supertype * (*match_metadata_desc)(char *arg);
 392         __u64 (*avail_size)(struct supertype *st, __u64 size);
 393         int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
 394                                    int delay, int write_behind,
 395                                    unsigned long long size, int may_change, int major);
 396         void (*locate_bitmap)(struct supertype *st, int fd);
 397         int (*write_bitmap)(struct supertype *st, int fd);
 398         void (*free_super)(struct supertype *st);
 399         int (*validate_geometry)(struct supertype *st, int level, int layout,
 400                                  int raiddisks,
 401                                  int chunk, unsigned long long size,
 402                                  char *subdev, unsigned long long *freesize);
 403
 404         struct mdinfo *(*container_content)(struct supertype *st);
 405
 406 /* for mdmon */
 407         int (*open_new)(struct supertype *c, struct active_array *a, int inst);
 408         void (*mark_clean)(struct active_array *a, unsigned long long sync_pos);
 409         void (*mark_dirty)(struct active_array *a);
 410         void (*mark_sync)(struct active_array *a, unsigned long long resync);
 411         void (*set_disk)(struct active_array *a, int n);
 412         void (*sync_metadata)(struct active_array *a);
 413
 414
 415         int major;
 416         char *text_version;
 417         int swapuuid; /* true if uuid is bigending rather than hostendian */
 418         int external;
 419 } super0, super1, super_ddf, super_ddf_bvd, super_ddf_svd, *superlist[];
 420
 421 extern struct superswitch super_imsm, super_imsm_raid;
 422
 423 struct supertype {
 424         struct superswitch *ss;
 425         int minor_version;
 426         int max_devs;
 427         int container_dev;    /* devnum of container */
 428         int container_member; /* numerical position in container */
 429         void *sb;
 430         void *info;
 431
 432         /* extra stuff used by mdmon */
 433         struct active_array *arrays;
 434         int devfd;
 435         int sock; /* listen to external programs */
 436         int pipe[2]; /* communicate between threads */
 437         int devnum;
 438         char *devname; /* e.g. md0.  This appears in metadata_verison:
 439                         *  external:/md0/12
 440                         */
 441         int devcnt;
 442
 443         struct mdinfo *devs;
 444
 445 };
 446
 447 extern struct supertype supertype_container_member;
 448 extern struct supertype *super_by_fd(int fd);
 449 extern struct supertype *guess_super(int fd);
 450 extern struct supertype *dup_super(struct supertype *st);
 451 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 452 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 453                          mdu_disk_info_t *disk);
 454
 455 #if __GNUC__ < 3
 456 struct stat64;
 457 #endif
 458
 459 #define HAVE_NFTW  we assume
 460 #define HAVE_FTW
 461
 462 #ifdef UCLIBC
 463 # include <features.h>
 464 # ifndef  __UCLIBC_HAS_FTW__
 465 #  undef HAVE_FTW
 466 #  undef HAVE_NFTW
 467 # endif
 468 #endif
 469
 470 #ifdef __dietlibc__
 471 # undef HAVE_NFTW
 472 #endif
 473
 474 #if defined(__KLIBC__)
 475 # undef HAVE_NFTW
 476 # undef HAVE_FTW
 477 #endif
 478
 479 #ifndef HAVE_NFTW
 480 # define FTW_PHYS 1
 481 # ifndef HAVE_FTW
 482   struct FTW {};
 483 # endif
 484 #endif
 485
 486 #ifdef HAVE_FTW
 487 # include <ftw.h>
 488 #endif
 489
 490 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 491
 492
 493 extern int Manage_ro(char *devname, int fd, int readonly);
 494 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
 495 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
 496 extern int Manage_reconfig(char *devname, int fd, int layout);
 497 extern int Manage_subdevs(char *devname, int fd,
 498                           mddev_dev_t devlist, int verbose);
 499 extern int autodetect(void);
 500 extern int Grow_Add_device(char *devname, int fd, char *newdev);
 501 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
 502 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
 503                         long long size,
 504                         int level, int layout, int chunksize, int raid_disks);
 505 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
 506                         int *fdlist, int cnt, char *backup_file);
 507
 508
 509 extern int Assemble(struct supertype *st, char *mddev, int mdfd,
 510                     mddev_ident_t ident,
 511                     mddev_dev_t devlist, char *backup_file,
 512                     int readonly, int runstop,
 513                     char *update, char *homehost,
 514                     int verbose, int force);
 515
 516 extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
 517                  int raiddisks,
 518                  mddev_dev_t devlist, int assume_clean,
 519                  char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
 520
 521
 522 extern int Create(struct supertype *st, char *mddev, int mdfd,
 523                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
 524                   char *name, char *homehost, int *uuid,
 525                   int subdevs, mddev_dev_t devlist,
 526                   int runstop, int verbose, int force, int assume_clean,
 527                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
 528
 529 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
 530 extern int Query(char *dev);
 531 extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
 532                    int SparcAdjust, struct supertype *forcest, char *homehost);
 533 extern int Monitor(mddev_dev_t devlist,
 534                    char *mailaddr, char *alert_cmd,
 535                    int period, int daemonise, int scan, int oneshot,
 536                    int dosyslog, int test, char *pidfile);
 537
 538 extern int Kill(char *dev, int force, int quiet, int noexcl);
 539 extern int Wait(char *dev);
 540
 541 extern int Incremental(char *devname, int verbose, int runstop,
 542                        struct supertype *st, char *homehost, int autof);
 543 extern int Incremental_container(struct supertype *st, char *devname,
 544                                  int verbose, int runstop, int autof);
 545 extern void RebuildMap(void);
 546 extern int IncrementalScan(int verbose);
 547
 548 extern int CreateBitmap(char *filename, int force, char uuid[16],
 549                         unsigned long chunksize, unsigned long daemon_sleep,
 550                         unsigned long write_behind,
 551                         unsigned long long array_size,
 552                         int major);
 553 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
 554 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
 555
 556 extern int md_get_version(int fd);
 557 extern int get_linux_version(void);
 558 extern int parse_uuid(char *str, int uuid[4]);
 559 extern int check_ext2(int fd, char *name);
 560 extern int check_reiser(int fd, char *name);
 561 extern int check_raid(int fd, char *name);
 562
 563 extern int get_mdp_major(void);
 564 extern int dev_open(char *dev, int flags);
 565 extern int is_standard(char *dev, int *nump);
 566
 567 extern int parse_auto(char *str, char *msg, int config);
 568 extern mddev_ident_t conf_get_ident(char *dev);
 569 extern mddev_dev_t conf_get_devs(void);
 570 extern int conf_test_dev(char *devname);
 571 extern struct createinfo *conf_get_create_info(void);
 572 extern void set_conffile(char *file);
 573 extern char *conf_get_mailaddr(void);
 574 extern char *conf_get_mailfrom(void);
 575 extern char *conf_get_program(void);
 576 extern char *conf_get_homehost(void);
 577 extern char *conf_line(FILE *file);
 578 extern char *conf_word(FILE *file, int allow_key);
 579 extern void free_line(char *line);
 580 extern int match_oneof(char *devices, char *devname);
 581 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
 582 extern int same_uuid(int a[4], int b[4], int swapuuid);
 583 extern void copy_uuid(void *a, int b[4], int swapuuid);
 584 extern unsigned long calc_csum(void *super, int bytes);
 585 extern int enough(int level, int raid_disks, int layout, int clean,
 586                    char *avail, int avail_disks);
 587 extern int ask(char *mesg);
 588 extern unsigned long long get_component_size(int fd);
 589 extern void remove_partitions(int fd);
 590 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
 591                                    int chunksize, unsigned long long devsize);
 592
 593
 594 extern char *human_size(long long bytes);
 595 char *human_size_brief(long long bytes);
 596
 597 #define NoMdDev (1<<23)
 598 extern int find_free_devnum(int use_partitions);
 599
 600 extern void put_md_name(char *name);
 601 extern char *get_md_name(int dev);
 602
 603 extern char DefaultConfFile[];
 604
 605 extern int open_mddev(char *dev, int autof);
 606 extern int open_mddev_devnum(char *devname, int devnum, char *name,
 607                              char *chosen_name, int parts);
 608 extern int open_container(int fd);
 609
 610 extern char *devnum2devname(int num);
 611 extern int fd2devnum(int fd);
 612
 613 #define LEVEL_MULTIPATH         (-4)
 614 #define LEVEL_LINEAR            (-1)
 615 #define LEVEL_FAULTY            (-5)
 616
 617 /* kernel module doesn't know about these */
 618 #define LEVEL_CONTAINER         (-100)
 619 #define LEVEL_UNSUPPORTED       (-200)
 620
 621
 622 /* faulty stuff */
 623
 624 #define WriteTransient  0
 625 #define ReadTransient   1
 626 #define WritePersistent 2
 627 #define ReadPersistent  3
 628 #define WriteAll        4 /* doesn't go to device */
 629 #define ReadFixable     5
 630 #define Modes   6
 631
 632 #define ClearErrors     31
 633 #define ClearFaults     30
 634
 635 #define AllPersist      100 /* internal use only */
 636 #define NoPersist       101
 637
 638 #define ModeMask        0x1f
 639 #define ModeShift       5
 640
 641
 642 #ifdef __TINYC__
 643 #undef minor
 644 #undef major
 645 #undef makedev
 646 #define minor(x) ((x)&0xff)
 647 #define major(x) (((x)>>8)&0xff)
 648 #define makedev(M,m) (((M)<<8) | (m))
 649 #endif
 650
 651 /* for raid5 */
 652 #define ALGORITHM_LEFT_ASYMMETRIC       0
 653 #define ALGORITHM_RIGHT_ASYMMETRIC      1
 654 #define ALGORITHM_LEFT_SYMMETRIC        2
 655 #define ALGORITHM_RIGHT_SYMMETRIC       3