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
 158         int container_member; /* for assembling external-metatdata arrays
 159                                * This is to be used internally by metadata
 160                                * handler only */
 161
 162         char            sys_name[20];
 163         struct mdinfo *devs;
 164         struct mdinfo *next;
 165
 166         /* Device info for mdmon: */
 167         int state_fd;
 168         #define DS_FAULTY       1
 169         #define DS_INSYNC       2
 170         #define DS_WRITE_MOSTLY 4
 171         #define DS_SPARE        8
 172         #define DS_BLOCKED      16
 173         #define DS_REMOVE       1024
 174         int prev_state, curr_state, next_state;
 175
 176 };
 177
 178 struct createinfo {
 179         int     uid;
 180         int     gid;
 181         int     autof;
 182         int     mode;
 183         int     symlinks;
 184         struct supertype *supertype;
 185 };
 186
 187 #define Name "mdadm"
 188
 189 enum mode {
 190         ASSEMBLE=1,
 191         BUILD,
 192         CREATE,
 193         MANAGE,
 194         MISC,
 195         MONITOR,
 196         GROW,
 197         INCREMENTAL,
 198         AUTODETECT,
 199 };
 200
 201 extern char short_options[];
 202 extern char short_bitmap_options[];
 203 extern char short_bitmap_auto_options[];
 204 extern struct option long_options[];
 205 extern char Version[], Usage[], Help[], OptionHelp[],
 206         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 207         Help_incr[],
 208         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 209
 210 /* for option that don't have short equivilents, we assign arbitrary
 211  * small numbers.  '1' means an undecorated option, so we start at '2'.
 212  */
 213 enum special_options {
 214         AssumeClean = 2,
 215         BitmapChunk,
 216         WriteBehind,
 217         ReAdd,
 218         NoDegraded,
 219         Sparc22,
 220         BackupFile,
 221         HomeHost,
 222         AutoHomeHost,
 223         Symlinks,
 224         AutoDetect,
 225 };
 226
 227 /* structures read from config file */
 228 /* List of mddevice names and identifiers
 229  * Identifiers can be:
 230  *    uuid=128-hex-uuid
 231  *    super-minor=decimal-minor-number-from-superblock
 232  *    devices=comma,separated,list,of,device,names,with,wildcards
 233  *
 234  * If multiple fields are present, the intersection of all matching
 235  * devices is considered
 236  */
 237 #define UnSet (0xfffe)
 238 typedef struct mddev_ident_s {
 239         char    *devname;
 240
 241         int     uuid_set;
 242         int     uuid[4];
 243         char    name[33];
 244
 245         unsigned int super_minor;
 246
 247         char    *devices;       /* comma separated list of device
 248                                  * names with wild cards
 249                                  */
 250         int     level;
 251         unsigned int raid_disks;
 252         unsigned int spare_disks;
 253         struct supertype *st;
 254         int     autof;          /* 1 for normal, 2 for partitioned */
 255         char    *spare_group;
 256         char    *bitmap_file;
 257         int     bitmap_fd;
 258
 259         struct mddev_ident_s *next;
 260 } *mddev_ident_t;
 261
 262 /* List of device names - wildcards expanded */
 263 typedef struct mddev_dev_s {
 264         char *devname;
 265         char disposition;       /* 'a' for add, 'r' for remove, 'f' for fail.
 266                                  * Not set for names read from .config
 267                                  */
 268         char writemostly;
 269         char re_add;
 270         char used;              /* set when used */
 271         struct mddev_dev_s *next;
 272 } *mddev_dev_t;
 273
 274 typedef struct mapping {
 275         char *name;
 276         int num;
 277 } mapping_t;
 278
 279
 280 struct mdstat_ent {
 281         char            *dev;
 282         int             devnum;
 283         int             active;
 284         char            *level;
 285         char            *pattern; /* U or up, _ for down */
 286         int             percent; /* -1 if no resync */
 287         int             resync; /* 1 if resync, 0 if recovery */
 288         int             devcnt;
 289         int             raid_disks;
 290         int             chunk_size;
 291         char *          metadata_version;
 292         struct mdstat_ent *next;
 293 };
 294
 295 extern struct mdstat_ent *mdstat_read(int hold, int start);
 296 extern void free_mdstat(struct mdstat_ent *ms);
 297 extern void mdstat_wait(int seconds);
 298 extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
 299 extern int mddev_busy(int devnum);
 300
 301 struct map_ent {
 302         struct map_ent *next;
 303         int     devnum;
 304         char    metadata[20];
 305         int     uuid[4];
 306         char    *path;
 307 };
 308 extern int map_update(struct map_ent **mpp, int devnum, char *metadata,
 309                       int uuid[4], char *path);
 310 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
 311 extern void map_read(struct map_ent **melp);
 312 extern int map_write(struct map_ent *mel);
 313 extern void map_delete(struct map_ent **mapp, int devnum);
 314 extern void map_free(struct map_ent *map);
 315 extern void map_add(struct map_ent **melp,
 316                     int devnum, char *metadata, int uuid[4], char *path);
 317
 318 /* various details can be requested */
 319 #define GET_LEVEL       1
 320 #define GET_LAYOUT      2
 321 #define GET_COMPONENT   4
 322 #define GET_CHUNK       8
 323 #define GET_CACHE       16
 324 #define GET_MISMATCH    32
 325 #define GET_VERSION     64
 326 #define GET_DISKS       128
 327
 328 #define GET_DEVS        1024 /* gets role, major, minor */
 329 #define GET_OFFSET      2048
 330 #define GET_SIZE        4096
 331 #define GET_STATE       8192
 332 #define GET_ERROR       16384
 333
 334 /* If fd >= 0, get the array it is open on,
 335  * else use devnum. >=0 -> major9. <0.....
 336  */
 337 extern int sysfs_open(int devnum, char *devname, char *attr);
 338 extern void sysfs_free(struct mdinfo *sra);
 339 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
 340 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 341                          char *name, char *val);
 342 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 343                          char *name, unsigned long long val);
 344 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 345                         char *name, unsigned long long *val);
 346 extern int sysfs_set_array(struct mdinfo *sra,
 347                            struct mdinfo *info);
 348 extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd);
 349 extern int sysfs_disk_to_sg(int fd);
 350 extern int sysfs_disk_to_scsi_id(int fd, __u32 *id);
 351
 352
 353 extern int save_stripes(int *source, unsigned long long *offsets,
 354                         int raid_disks, int chunk_size, int level, int layout,
 355                         int nwrites, int *dest,
 356                         unsigned long long start, unsigned long long length);
 357 extern int restore_stripes(int *dest, unsigned long long *offsets,
 358                            int raid_disks, int chunk_size, int level, int layout,
 359                            int source, unsigned long long read_offset,
 360                            unsigned long long start, unsigned long long length);
 361
 362 #ifndef Sendmail
 363 #define Sendmail "/usr/lib/sendmail -t"
 364 #endif
 365
 366 #define SYSLOG_FACILITY LOG_DAEMON
 367
 368 extern char *map_num(mapping_t *map, int num);
 369 extern int map_name(mapping_t *map, char *name);
 370 extern mapping_t r5layout[], pers[], modes[], faultylayout[];
 371
 372 extern char *map_dev(int major, int minor, int create);
 373
 374 struct active_array;
 375 struct metadata_update;
 376
 377 /* A superswitch provides entry point the a metadata handler.
 378  *
 379  * The super_switch primarily operates on some "metadata" that
 380  * is accessed via the 'supertype'.
 381  * This metadata has one of three possible sources.
 382  * 1/ It is read from a single device.  In this case it may not completely
 383  *    describe the array or arrays as some information might be on other
 384  *    devices.
 385  * 2/ It is read from all devices in a container.  In this case all
 386  *    information is present.
 387  * 3/ It is created by ->init_super / ->add_to_super.  In this case it will
 388  *    be complete once enough ->add_to_super calls have completed.
 389  *
 390  * When creating an array inside a container, the metadata will be
 391  * formed by a combination of 2 and 3.  The metadata or the array is read,
 392  * then new information is added.
 393  *
 394  * The metadata must sometimes have a concept of a 'current' array
 395  * and a 'current' device.
 396  * The 'current' array is set by init_super to be the newly created array,
 397  * or is set by super_by_fd when it finds it is looking at an array inside
 398  * a container.
 399  *
 400  * The 'current' device is either the device that the metadata was read from
 401  * in case 1, or the last device added by add_to_super in case 3.
 402  * Case 2 does not identify a 'current' device.
 403  */
 404 extern struct superswitch {
 405
 406         /* Used to report details of metadata read from a component
 407          * device. ->load_super has been called.
 408          */
 409         void (*examine_super)(struct supertype *st, char *homehost);
 410         void (*brief_examine_super)(struct supertype *st);
 411         void (*export_examine_super)(struct supertype *st);
 412
 413         /* Used to report details of an active array.
 414          * ->load_super was possibly given a 'component' string.
 415          */
 416         void (*detail_super)(struct supertype *st, char *homehost);
 417         void (*brief_detail_super)(struct supertype *st);
 418         void (*export_detail_super)(struct supertype *st);
 419
 420         /* Used:
 421          *   to get uuid to storing in bitmap metadata
 422          *   and 'reshape' backup-data metadata
 423          *   To see if a device is being re-added to an array it was part of.
 424          */
 425         void (*uuid_from_super)(struct supertype *st, int uuid[4]);
 426
 427         /* Extra generic details from metadata.  This could be details about
 428          * the container, or about an individual array within the container.
 429          * The determination is made either by:
 430          *   load_super being given a 'component' string.
 431          *   validate_geometry determining what to create.
 432          * getinfo_super_n really needs to be removed..
 433          */
 434         void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
 435         void (*getinfo_super_n)(struct supertype *st, struct mdinfo *info);
 436
 437         /* Check if the given metadata is flagged as belonging to "this"
 438          * host.  For arrays that don't determine a minor-number, this
 439          * can always be true (??)
 440          */
 441         int (*match_home)(struct supertype *st, char *homehost);
 442
 443         /* Make one of several generic modifications to metadata
 444          * prior to assembly (or other times).
 445          *   sparc2.2  - first bug in early 0.90 metadata
 446          *   super-minor - change name of 0.90 metadata
 447          *   summaries - 'correct' any redundant data
 448          *   resync - mark array as dirty to trigger a resync.
 449          *   uuid - set new uuid - only 0.90 or 1.x
 450          *   name - change the name of the array (where supported)
 451          *   homehost - change which host this array is tied to.
 452          *   devicesize - If metadata is at start of device, change recorded
 453          *               device size to match actual device size
 454          *   byteorder - swap bytes for 0.90 metadata
 455          *
 456          *   force-one  - mark that device as uptodate, not old or failed.
 457          *   force-array - mark array as clean if it would not otherwise
 458          *               assemble
 459          *   assemble   - not sure how this is different from force-one...
 460          *   linear-grow-new - add a new device to a linear array, but don't
 461          *                   change the size: so superblock still matches
 462          *   linear-grow-update - now change the size of the array.
 463          */
 464         int (*update_super)(struct supertype *st, struct mdinfo *info,
 465                             char *update,
 466                             char *devname, int verbose,
 467                             int uuid_set, char *homehost);
 468
 469         /* Create new metadata for new array as described.  This could
 470          * be a new container, or an array in a pre-existing container.
 471          * Also used to zero metadata prior to writing it to invalidate old
 472          * metadata.
 473          */
 474         int (*init_super)(struct supertype *st, mdu_array_info_t *info,
 475                           unsigned long long size, char *name,
 476                           char *homehost, int *uuid);
 477
 478         /* update the metadata to include new device, either at create or
 479          * when hot-adding a spare.
 480          */
 481         void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
 482                              int fd, char *devname);
 483
 484         /* Write metadata to one device when fixing problems or adding
 485          * a new device.
 486          */
 487         int (*store_super)(struct supertype *st, int fd);
 488
 489         /*  Write all metadata for this array.
 490          */
 491         int (*write_init_super)(struct supertype *st);
 492         int (*compare_super)(struct supertype *st, struct supertype *tst);
 493         int (*load_super)(struct supertype *st, int fd, char *devname);
 494         struct supertype * (*match_metadata_desc)(char *arg);
 495         __u64 (*avail_size)(struct supertype *st, __u64 size);
 496         int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
 497                                    int delay, int write_behind,
 498                                    unsigned long long size, int may_change, int major);
 499         void (*locate_bitmap)(struct supertype *st, int fd);
 500         int (*write_bitmap)(struct supertype *st, int fd);
 501         void (*free_super)(struct supertype *st);
 502         int (*validate_geometry)(struct supertype *st, int level, int layout,
 503                                  int raiddisks,
 504                                  int chunk, unsigned long long size,
 505                                  char *subdev, unsigned long long *freesize);
 506
 507         struct mdinfo *(*container_content)(struct supertype *st);
 508
 509 /* for mdmon */
 510         int (*open_new)(struct supertype *c, struct active_array *a,
 511                         char *inst);
 512
 513         /* Tell the metadata handler the current state of the array.
 514          * This covers whether it is known to be consistent (no pending writes)
 515          * when how far along a resync is known to have progressed
 516          * (in a->resync_start).
 517          * resync status is really irrelevant if the array is not consistent,
 518          * but some metadata (DDF!) have a place to record the distinction.
 519          */
 520         void (*set_array_state)(struct active_array *a, int consistent);
 521
 522         /* When the state of a device might have changed, we call set_disk to
 523          * tell the metadata what the current state is.
 524          * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
 525          * transitions.
 526          * set_disk might be called when the state of the particular disk has
 527          * not in fact changed.
 528          */
 529         void (*set_disk)(struct active_array *a, int n, int state);
 530         void (*sync_metadata)(struct supertype *st);
 531         void (*process_update)(struct supertype *st,
 532                                struct metadata_update *update);
 533
 534         /* activate_spare will check if the array is degraded and, if it
 535          * is, try to find some spare space in the container.
 536          * On success, it add appropriate updates (For process_update) to
 537          * to the 'updates' list and returns a list of 'mdinfo' identifying
 538          * the device, or devices as there might be multiple missing
 539          * devices and multiple spares available.
 540          */
 541         struct mdinfo *(*activate_spare)(struct active_array *a,
 542                                          struct metadata_update **updates);
 543
 544         int swapuuid; /* true if uuid is bigending rather than hostendian */
 545         int external;
 546 } super0, super1, super_ddf, *superlist[];
 547
 548 extern struct superswitch super_imsm;
 549
 550 /* A supertype holds a particular collection of metadata.
 551  * It identifies the metadata type by the superswitch, and the particular
 552  * sub-version of that metadata type.
 553  * metadata read in or created is stored in 'sb' and 'info'.
 554  * There are also fields used by mdmon to track containers.
 555  *
 556  * A supertype is created by:
 557  *   super_by_fd
 558  *   guess_super
 559  *   dup_super
 560  */
 561 struct supertype {
 562         struct superswitch *ss;
 563         int minor_version;
 564         int max_devs;
 565         int container_dev;    /* devnum of container */
 566         char subarray[32];      /* name of array inside container */
 567         void *sb;
 568         void *info;
 569
 570         /* extra stuff used by mdmon */
 571         struct active_array *arrays;
 572         int sock; /* listen to external programs */
 573         int mgr_pipe[2]; /* communicate between threads */
 574         int mon_pipe[2]; /* communicate between threads */
 575         int devnum;
 576         char *devname; /* e.g. md0.  This appears in metadata_verison:
 577                         *  external:/md0/12
 578                         */
 579         int devcnt;
 580         char *device_name; /* e.g. /dev/md/whatever */
 581
 582         struct mdinfo *devs;
 583
 584 };
 585
 586 extern struct supertype *super_by_fd(int fd);
 587 extern struct supertype *guess_super(int fd);
 588 extern struct supertype *dup_super(struct supertype *st);
 589 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 590 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 591                          mdu_disk_info_t *disk);
 592
 593 #if __GNUC__ < 3
 594 struct stat64;
 595 #endif
 596
 597 #define HAVE_NFTW  we assume
 598 #define HAVE_FTW
 599
 600 #ifdef UCLIBC
 601 # include <features.h>
 602 # ifndef  __UCLIBC_HAS_FTW__
 603 #  undef HAVE_FTW
 604 #  undef HAVE_NFTW
 605 # endif
 606 #endif
 607
 608 #ifdef __dietlibc__
 609 # undef HAVE_NFTW
 610 #endif
 611
 612 #if defined(__KLIBC__)
 613 # undef HAVE_NFTW
 614 # undef HAVE_FTW
 615 #endif
 616
 617 #ifndef HAVE_NFTW
 618 # define FTW_PHYS 1
 619 # ifndef HAVE_FTW
 620   struct FTW {};
 621 # endif
 622 #endif
 623
 624 #ifdef HAVE_FTW
 625 # include <ftw.h>
 626 #endif
 627
 628 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 629
 630
 631 extern int Manage_ro(char *devname, int fd, int readonly);
 632 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
 633 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
 634 extern int Manage_reconfig(char *devname, int fd, int layout);
 635 extern int Manage_subdevs(char *devname, int fd,
 636                           mddev_dev_t devlist, int verbose);
 637 extern int autodetect(void);
 638 extern int Grow_Add_device(char *devname, int fd, char *newdev);
 639 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
 640 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
 641                         long long size,
 642                         int level, int layout, int chunksize, int raid_disks);
 643 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
 644                         int *fdlist, int cnt, char *backup_file);
 645
 646
 647 extern int Assemble(struct supertype *st, char *mddev, int mdfd,
 648                     mddev_ident_t ident,
 649                     mddev_dev_t devlist, char *backup_file,
 650                     int readonly, int runstop,
 651                     char *update, char *homehost,
 652                     int verbose, int force);
 653
 654 extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
 655                  int raiddisks,
 656                  mddev_dev_t devlist, int assume_clean,
 657                  char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
 658
 659
 660 extern int Create(struct supertype *st, char *mddev, int mdfd,
 661                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
 662                   char *name, char *homehost, int *uuid,
 663                   int subdevs, mddev_dev_t devlist,
 664                   int runstop, int verbose, int force, int assume_clean,
 665                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
 666
 667 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
 668 extern int Query(char *dev);
 669 extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
 670                    int SparcAdjust, struct supertype *forcest, char *homehost);
 671 extern int Monitor(mddev_dev_t devlist,
 672                    char *mailaddr, char *alert_cmd,
 673                    int period, int daemonise, int scan, int oneshot,
 674                    int dosyslog, int test, char *pidfile);
 675
 676 extern int Kill(char *dev, int force, int quiet, int noexcl);
 677 extern int Wait(char *dev);
 678
 679 extern int Incremental(char *devname, int verbose, int runstop,
 680                        struct supertype *st, char *homehost, int autof);
 681 extern int Incremental_container(struct supertype *st, char *devname,
 682                                  int verbose, int runstop, int autof);
 683 extern void RebuildMap(void);
 684 extern int IncrementalScan(int verbose);
 685
 686 extern int CreateBitmap(char *filename, int force, char uuid[16],
 687                         unsigned long chunksize, unsigned long daemon_sleep,
 688                         unsigned long write_behind,
 689                         unsigned long long array_size,
 690                         int major);
 691 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
 692 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
 693
 694 extern int md_get_version(int fd);
 695 extern int get_linux_version(void);
 696 extern int parse_uuid(char *str, int uuid[4]);
 697 extern int check_ext2(int fd, char *name);
 698 extern int check_reiser(int fd, char *name);
 699 extern int check_raid(int fd, char *name);
 700
 701 extern int get_mdp_major(void);
 702 extern int dev_open(char *dev, int flags);
 703 extern int open_dev_excl(int devnum);
 704 extern int is_standard(char *dev, int *nump);
 705
 706 extern int parse_auto(char *str, char *msg, int config);
 707 extern mddev_ident_t conf_get_ident(char *dev);
 708 extern mddev_dev_t conf_get_devs(void);
 709 extern int conf_test_dev(char *devname);
 710 extern struct createinfo *conf_get_create_info(void);
 711 extern void set_conffile(char *file);
 712 extern char *conf_get_mailaddr(void);
 713 extern char *conf_get_mailfrom(void);
 714 extern char *conf_get_program(void);
 715 extern char *conf_get_homehost(void);
 716 extern char *conf_line(FILE *file);
 717 extern char *conf_word(FILE *file, int allow_key);
 718 extern void free_line(char *line);
 719 extern int match_oneof(char *devices, char *devname);
 720 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
 721 extern int same_uuid(int a[4], int b[4], int swapuuid);
 722 extern void copy_uuid(void *a, int b[4], int swapuuid);
 723 extern unsigned long calc_csum(void *super, int bytes);
 724 extern int enough(int level, int raid_disks, int layout, int clean,
 725                    char *avail, int avail_disks);
 726 extern int ask(char *mesg);
 727 extern unsigned long long get_component_size(int fd);
 728 extern void remove_partitions(int fd);
 729 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
 730                                    int chunksize, unsigned long long devsize);
 731
 732
 733 extern char *human_size(long long bytes);
 734 char *human_size_brief(long long bytes);
 735
 736 #define NoMdDev (1<<23)
 737 extern int find_free_devnum(int use_partitions);
 738
 739 extern void put_md_name(char *name);
 740 extern char *get_md_name(int dev);
 741
 742 extern char DefaultConfFile[];
 743
 744 extern int open_mddev(char *dev, int autof);
 745 extern int open_mddev_devnum(char *devname, int devnum, char *name,
 746                              char *chosen_name, int parts);
 747 extern int open_container(int fd);
 748
 749 extern int mdmon_running(int devnum);
 750 extern int signal_mdmon(int devnum);
 751
 752 extern char *devnum2devname(int num);
 753 extern int fd2devnum(int fd);
 754
 755 static inline int dev2major(int d)
 756 {
 757         if (d >= 0)
 758                 return MD_MAJOR;
 759         else
 760                 return get_mdp_major();
 761 }
 762
 763 static inline int dev2minor(int d)
 764 {
 765         if (d >= 0)
 766                 return d;
 767         return (-1-d) << MdpMinorShift;
 768 }
 769
 770 #define LEVEL_MULTIPATH         (-4)
 771 #define LEVEL_LINEAR            (-1)
 772 #define LEVEL_FAULTY            (-5)
 773
 774 /* kernel module doesn't know about these */
 775 #define LEVEL_CONTAINER         (-100)
 776 #define LEVEL_UNSUPPORTED       (-200)
 777
 778
 779 /* faulty stuff */
 780
 781 #define WriteTransient  0
 782 #define ReadTransient   1
 783 #define WritePersistent 2
 784 #define ReadPersistent  3
 785 #define WriteAll        4 /* doesn't go to device */
 786 #define ReadFixable     5
 787 #define Modes   6
 788
 789 #define ClearErrors     31
 790 #define ClearFaults     30
 791
 792 #define AllPersist      100 /* internal use only */
 793 #define NoPersist       101
 794
 795 #define ModeMask        0x1f
 796 #define ModeShift       5
 797
 798
 799 #ifdef __TINYC__
 800 #undef minor
 801 #undef major
 802 #undef makedev
 803 #define minor(x) ((x)&0xff)
 804 #define major(x) (((x)>>8)&0xff)
 805 #define makedev(M,m) (((M)<<8) | (m))
 806 #endif
 807
 808 /* for raid5 */
 809 #define ALGORITHM_LEFT_ASYMMETRIC       0
 810 #define ALGORITHM_RIGHT_ASYMMETRIC      1
 811 #define ALGORITHM_LEFT_SYMMETRIC        2
 812 #define ALGORITHM_RIGHT_SYMMETRIC       3