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         unsigned long           safe_mode_delay; /* ms delay to mark clean */
 153         int                     new_level, delta_disks, new_layout, new_chunk;
 154         int                     errors;
 155         int                     cache_size; /* size of raid456 stripe cache*/
 156         int                     mismatch_cnt;
 157         char                    text_version[50];
 158
 159         int container_member; /* for assembling external-metatdata arrays
 160                                * This is to be used internally by metadata
 161                                * handler only */
 162
 163         char            sys_name[20];
 164         struct mdinfo *devs;
 165         struct mdinfo *next;
 166
 167         /* Device info for mdmon: */
 168         int state_fd;
 169         #define DS_FAULTY       1
 170         #define DS_INSYNC       2
 171         #define DS_WRITE_MOSTLY 4
 172         #define DS_SPARE        8
 173         #define DS_BLOCKED      16
 174         #define DS_REMOVE       1024
 175         #define DS_UNBLOCK      2048
 176         int prev_state, curr_state, next_state;
 177
 178 };
 179
 180 struct createinfo {
 181         int     uid;
 182         int     gid;
 183         int     autof;
 184         int     mode;
 185         int     symlinks;
 186         struct supertype *supertype;
 187 };
 188
 189 #define Name "mdadm"
 190
 191 enum mode {
 192         ASSEMBLE=1,
 193         BUILD,
 194         CREATE,
 195         MANAGE,
 196         MISC,
 197         MONITOR,
 198         GROW,
 199         INCREMENTAL,
 200         AUTODETECT,
 201 };
 202
 203 extern char short_options[];
 204 extern char short_bitmap_options[];
 205 extern char short_bitmap_auto_options[];
 206 extern struct option long_options[];
 207 extern char Version[], Usage[], Help[], OptionHelp[],
 208         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 209         Help_incr[],
 210         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 211
 212 /* for option that don't have short equivilents, we assign arbitrary
 213  * small numbers.  '1' means an undecorated option, so we start at '2'.
 214  */
 215 enum special_options {
 216         AssumeClean = 2,
 217         BitmapChunk,
 218         WriteBehind,
 219         ReAdd,
 220         NoDegraded,
 221         Sparc22,
 222         BackupFile,
 223         HomeHost,
 224         AutoHomeHost,
 225         Symlinks,
 226         AutoDetect,
 227         Waitclean,
 228 };
 229
 230 /* structures read from config file */
 231 /* List of mddevice names and identifiers
 232  * Identifiers can be:
 233  *    uuid=128-hex-uuid
 234  *    super-minor=decimal-minor-number-from-superblock
 235  *    devices=comma,separated,list,of,device,names,with,wildcards
 236  *
 237  * If multiple fields are present, the intersection of all matching
 238  * devices is considered
 239  */
 240 #define UnSet (0xfffe)
 241 typedef struct mddev_ident_s {
 242         char    *devname;
 243
 244         int     uuid_set;
 245         int     uuid[4];
 246         char    name[33];
 247
 248         unsigned int super_minor;
 249
 250         char    *devices;       /* comma separated list of device
 251                                  * names with wild cards
 252                                  */
 253         int     level;
 254         unsigned int raid_disks;
 255         unsigned int spare_disks;
 256         struct supertype *st;
 257         int     autof;          /* 1 for normal, 2 for partitioned */
 258         char    *spare_group;
 259         char    *bitmap_file;
 260         int     bitmap_fd;
 261
 262         struct mddev_ident_s *next;
 263 } *mddev_ident_t;
 264
 265 /* List of device names - wildcards expanded */
 266 typedef struct mddev_dev_s {
 267         char *devname;
 268         char disposition;       /* 'a' for add, 'r' for remove, 'f' for fail.
 269                                  * Not set for names read from .config
 270                                  */
 271         char writemostly;
 272         char re_add;
 273         char used;              /* set when used */
 274         struct mddev_dev_s *next;
 275 } *mddev_dev_t;
 276
 277 typedef struct mapping {
 278         char *name;
 279         int num;
 280 } mapping_t;
 281
 282
 283 struct mdstat_ent {
 284         char            *dev;
 285         int             devnum;
 286         int             active;
 287         char            *level;
 288         char            *pattern; /* U or up, _ for down */
 289         int             percent; /* -1 if no resync */
 290         int             resync; /* 1 if resync, 0 if recovery */
 291         int             devcnt;
 292         int             raid_disks;
 293         int             chunk_size;
 294         char *          metadata_version;
 295         struct mdstat_ent *next;
 296 };
 297
 298 extern struct mdstat_ent *mdstat_read(int hold, int start);
 299 extern void free_mdstat(struct mdstat_ent *ms);
 300 extern void mdstat_wait(int seconds);
 301 extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
 302 extern int mddev_busy(int devnum);
 303
 304 struct map_ent {
 305         struct map_ent *next;
 306         int     devnum;
 307         char    metadata[20];
 308         int     uuid[4];
 309         char    *path;
 310 };
 311 extern int map_update(struct map_ent **mpp, int devnum, char *metadata,
 312                       int uuid[4], char *path);
 313 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
 314 extern void map_read(struct map_ent **melp);
 315 extern int map_write(struct map_ent *mel);
 316 extern void map_delete(struct map_ent **mapp, int devnum);
 317 extern void map_free(struct map_ent *map);
 318 extern void map_add(struct map_ent **melp,
 319                     int devnum, char *metadata, int uuid[4], char *path);
 320
 321 /* various details can be requested */
 322 #define GET_LEVEL       1
 323 #define GET_LAYOUT      2
 324 #define GET_COMPONENT   4
 325 #define GET_CHUNK       8
 326 #define GET_CACHE       16
 327 #define GET_MISMATCH    32
 328 #define GET_VERSION     64
 329 #define GET_DISKS       128
 330 #define GET_DEGRADED    256
 331 #define GET_SAFEMODE    512
 332
 333 #define GET_DEVS        1024 /* gets role, major, minor */
 334 #define GET_OFFSET      2048
 335 #define GET_SIZE        4096
 336 #define GET_STATE       8192
 337 #define GET_ERROR       16384
 338
 339 /* If fd >= 0, get the array it is open on,
 340  * else use devnum. >=0 -> major9. <0.....
 341  */
 342 extern int sysfs_open(int devnum, char *devname, char *attr);
 343 extern void sysfs_init(struct mdinfo *mdi, int fd, int devnum);
 344 extern void sysfs_free(struct mdinfo *sra);
 345 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
 346 extern int sysfs_attr_match(const char *attr, const char *str);
 347 extern int sysfs_match_word(const char *word, char **list);
 348 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 349                          char *name, char *val);
 350 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 351                          char *name, unsigned long long val);
 352 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 353                         char *name, unsigned long long *val);
 354 extern int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms);
 355 extern int sysfs_set_array(struct mdinfo *info, int vers);
 356 extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd);
 357 extern int sysfs_disk_to_scsi_id(int fd, __u32 *id);
 358 extern int sysfs_unique_holder(int devnum, long rdev);
 359 extern int load_sys(char *path, char *buf);
 360
 361
 362 extern int save_stripes(int *source, unsigned long long *offsets,
 363                         int raid_disks, int chunk_size, int level, int layout,
 364                         int nwrites, int *dest,
 365                         unsigned long long start, unsigned long long length);
 366 extern int restore_stripes(int *dest, unsigned long long *offsets,
 367                            int raid_disks, int chunk_size, int level, int layout,
 368                            int source, unsigned long long read_offset,
 369                            unsigned long long start, unsigned long long length);
 370
 371 #ifndef Sendmail
 372 #define Sendmail "/usr/lib/sendmail -t"
 373 #endif
 374
 375 #define SYSLOG_FACILITY LOG_DAEMON
 376
 377 extern char *map_num(mapping_t *map, int num);
 378 extern int map_name(mapping_t *map, char *name);
 379 extern mapping_t r5layout[], pers[], modes[], faultylayout[];
 380
 381 extern char *map_dev(int major, int minor, int create);
 382
 383 struct active_array;
 384 struct metadata_update;
 385
 386 /* A superswitch provides entry point the a metadata handler.
 387  *
 388  * The super_switch primarily operates on some "metadata" that
 389  * is accessed via the 'supertype'.
 390  * This metadata has one of three possible sources.
 391  * 1/ It is read from a single device.  In this case it may not completely
 392  *    describe the array or arrays as some information might be on other
 393  *    devices.
 394  * 2/ It is read from all devices in a container.  In this case all
 395  *    information is present.
 396  * 3/ It is created by ->init_super / ->add_to_super.  In this case it will
 397  *    be complete once enough ->add_to_super calls have completed.
 398  *
 399  * When creating an array inside a container, the metadata will be
 400  * formed by a combination of 2 and 3.  The metadata or the array is read,
 401  * then new information is added.
 402  *
 403  * The metadata must sometimes have a concept of a 'current' array
 404  * and a 'current' device.
 405  * The 'current' array is set by init_super to be the newly created array,
 406  * or is set by super_by_fd when it finds it is looking at an array inside
 407  * a container.
 408  *
 409  * The 'current' device is either the device that the metadata was read from
 410  * in case 1, or the last device added by add_to_super in case 3.
 411  * Case 2 does not identify a 'current' device.
 412  */
 413 extern struct superswitch {
 414
 415         /* Used to report details of metadata read from a component
 416          * device. ->load_super has been called.
 417          */
 418         void (*examine_super)(struct supertype *st, char *homehost);
 419         void (*brief_examine_super)(struct supertype *st);
 420         void (*export_examine_super)(struct supertype *st);
 421
 422         /* Used to report details of an active array.
 423          * ->load_super was possibly given a 'component' string.
 424          */
 425         void (*detail_super)(struct supertype *st, char *homehost);
 426         void (*brief_detail_super)(struct supertype *st);
 427         void (*export_detail_super)(struct supertype *st);
 428
 429         /* Used:
 430          *   to get uuid to storing in bitmap metadata
 431          *   and 'reshape' backup-data metadata
 432          *   To see if a device is being re-added to an array it was part of.
 433          */
 434         void (*uuid_from_super)(struct supertype *st, int uuid[4]);
 435
 436         /* Extra generic details from metadata.  This could be details about
 437          * the container, or about an individual array within the container.
 438          * The determination is made either by:
 439          *   load_super being given a 'component' string.
 440          *   validate_geometry determining what to create.
 441          * The info includes both array information and device information.
 442          * The particular device should be:
 443          *   The last device added by add_to_super
 444          *   The device the metadata was loaded from by load_super
 445          */
 446         void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
 447
 448         /* Check if the given metadata is flagged as belonging to "this"
 449          * host.  0 for 'no', 1 for 'yes', -1 for "Don't record homehost"
 450          */
 451         int (*match_home)(struct supertype *st, char *homehost);
 452
 453         /* Make one of several generic modifications to metadata
 454          * prior to assembly (or other times).
 455          *   sparc2.2  - first bug in early 0.90 metadata
 456          *   super-minor - change name of 0.90 metadata
 457          *   summaries - 'correct' any redundant data
 458          *   resync - mark array as dirty to trigger a resync.
 459          *   uuid - set new uuid - only 0.90 or 1.x
 460          *   name - change the name of the array (where supported)
 461          *   homehost - change which host this array is tied to.
 462          *   devicesize - If metadata is at start of device, change recorded
 463          *               device size to match actual device size
 464          *   byteorder - swap bytes for 0.90 metadata
 465          *
 466          *   force-one  - mark that device as uptodate, not old or failed.
 467          *   force-array - mark array as clean if it would not otherwise
 468          *               assemble
 469          *   assemble   - not sure how this is different from force-one...
 470          *   linear-grow-new - add a new device to a linear array, but don't
 471          *                   change the size: so superblock still matches
 472          *   linear-grow-update - now change the size of the array.
 473          */
 474         int (*update_super)(struct supertype *st, struct mdinfo *info,
 475                             char *update,
 476                             char *devname, int verbose,
 477                             int uuid_set, char *homehost);
 478
 479         /* Create new metadata for new array as described.  This could
 480          * be a new container, or an array in a pre-existing container.
 481          * Also used to zero metadata prior to writing it to invalidate old
 482          * metadata.
 483          */
 484         int (*init_super)(struct supertype *st, mdu_array_info_t *info,
 485                           unsigned long long size, char *name,
 486                           char *homehost, int *uuid);
 487
 488         /* update the metadata to include new device, either at create or
 489          * when hot-adding a spare.
 490          */
 491         void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
 492                              int fd, char *devname);
 493
 494         /* Write metadata to one device when fixing problems or adding
 495          * a new device.
 496          */
 497         int (*store_super)(struct supertype *st, int fd);
 498
 499         /*  Write all metadata for this array.
 500          */
 501         int (*write_init_super)(struct supertype *st);
 502         int (*compare_super)(struct supertype *st, struct supertype *tst);
 503         int (*load_super)(struct supertype *st, int fd, char *devname);
 504         struct supertype * (*match_metadata_desc)(char *arg);
 505         __u64 (*avail_size)(struct supertype *st, __u64 size);
 506         int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
 507                                    int delay, int write_behind,
 508                                    unsigned long long size, int may_change, int major);
 509         void (*locate_bitmap)(struct supertype *st, int fd);
 510         int (*write_bitmap)(struct supertype *st, int fd);
 511         void (*free_super)(struct supertype *st);
 512
 513         /* validate_geometry is called with an st returned by
 514          * match_metadata_desc.
 515          * It should check that the geometry described in compatible with
 516          * the metadata type.  It will be called repeatedly as devices
 517          * added to validate changing size and new devices.  If there are
 518          * inter-device dependencies, it should record sufficient details
 519          * so these can be validated.
 520          */
 521         int (*validate_geometry)(struct supertype *st, int level, int layout,
 522                                  int raiddisks,
 523                                  int chunk, unsigned long long size,
 524                                  char *subdev, unsigned long long *freesize,
 525                                  int verbose);
 526
 527         struct mdinfo *(*container_content)(struct supertype *st);
 528
 529 /* for mdmon */
 530         int (*open_new)(struct supertype *c, struct active_array *a,
 531                         char *inst);
 532
 533         /* Tell the metadata handler the current state of the array.
 534          * This covers whether it is known to be consistent (no pending writes)
 535          * and how far along a resync is known to have progressed
 536          * (in a->resync_start).
 537          * resync status is really irrelevant if the array is not consistent,
 538          * but some metadata (DDF!) have a place to record the distinction.
 539          * If 'consistent' is '2', then the array can mark it dirty if a
 540          * resync/recovery/whatever is required, or leave it clean if not.
 541          * Return value is 0 dirty (not consistent) and 1 if clean.
 542          * it is only really important if consistent is passed in as '2'.
 543          */
 544         int (*set_array_state)(struct active_array *a, int consistent);
 545
 546         /* When the state of a device might have changed, we call set_disk to
 547          * tell the metadata what the current state is.
 548          * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
 549          * transitions.
 550          * set_disk might be called when the state of the particular disk has
 551          * not in fact changed.
 552          */
 553         void (*set_disk)(struct active_array *a, int n, int state);
 554         void (*sync_metadata)(struct supertype *st);
 555         void (*process_update)(struct supertype *st,
 556                                struct metadata_update *update);
 557         void (*prepare_update)(struct supertype *st,
 558                                struct metadata_update *update);
 559
 560         /* activate_spare will check if the array is degraded and, if it
 561          * is, try to find some spare space in the container.
 562          * On success, it add appropriate updates (For process_update) to
 563          * to the 'updates' list and returns a list of 'mdinfo' identifying
 564          * the device, or devices as there might be multiple missing
 565          * devices and multiple spares available.
 566          */
 567         struct mdinfo *(*activate_spare)(struct active_array *a,
 568                                          struct metadata_update **updates);
 569
 570         int swapuuid; /* true if uuid is bigending rather than hostendian */
 571         int external;
 572 } super0, super1, super_ddf, *superlist[];
 573
 574 extern struct superswitch super_imsm;
 575
 576 struct metadata_update {
 577         int     len;
 578         char    *buf;
 579         void    *space; /* allocated space that monitor will use */
 580         struct metadata_update *next;
 581 };
 582
 583 /* A supertype holds a particular collection of metadata.
 584  * It identifies the metadata type by the superswitch, and the particular
 585  * sub-version of that metadata type.
 586  * metadata read in or created is stored in 'sb' and 'info'.
 587  * There are also fields used by mdmon to track containers.
 588  *
 589  * A supertype may refer to:
 590  *   Just an array, possibly in a container
 591  *   A container, not identifying any particular array
 592  *   Info read from just one device, not yet fully describing the array/container.
 593  *
 594  *
 595  * A supertype is created by:
 596  *   super_by_fd
 597  *   guess_super
 598  *   dup_super
 599  */
 600 struct supertype {
 601         struct superswitch *ss;
 602         int minor_version;
 603         int max_devs;
 604         int container_dev;    /* devnum of container */
 605         char subarray[32];      /* name of array inside container */
 606         void *sb;
 607         void *info;
 608         int loaded_container;   /* Set if load_super found a container,
 609                                  * not just one device */
 610
 611         struct metadata_update *updates;
 612         struct metadata_update **update_tail;
 613
 614         /* extra stuff used by mdmon */
 615         struct active_array *arrays;
 616         int sock; /* listen to external programs */
 617         int devnum;
 618         char *devname; /* e.g. md0.  This appears in metadata_verison:
 619                         *  external:/md0/12
 620                         */
 621         int devcnt;
 622         char *device_name; /* e.g. /dev/md/whatever */
 623
 624         struct mdinfo *devs;
 625
 626 };
 627
 628 extern struct supertype *super_by_fd(int fd);
 629 extern struct supertype *guess_super(int fd);
 630 extern struct supertype *dup_super(struct supertype *st);
 631 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 632 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 633                          mdu_disk_info_t *disk);
 634
 635 #if __GNUC__ < 3
 636 struct stat64;
 637 #endif
 638
 639 #define HAVE_NFTW  we assume
 640 #define HAVE_FTW
 641
 642 #ifdef UCLIBC
 643 # include <features.h>
 644 # ifndef  __UCLIBC_HAS_FTW__
 645 #  undef HAVE_FTW
 646 #  undef HAVE_NFTW
 647 # endif
 648 #endif
 649
 650 #ifdef __dietlibc__
 651 # undef HAVE_NFTW
 652 #endif
 653
 654 #if defined(__KLIBC__)
 655 # undef HAVE_NFTW
 656 # undef HAVE_FTW
 657 #endif
 658
 659 #ifndef HAVE_NFTW
 660 # define FTW_PHYS 1
 661 # ifndef HAVE_FTW
 662   struct FTW {};
 663 # endif
 664 #endif
 665
 666 #ifdef HAVE_FTW
 667 # include <ftw.h>
 668 #endif
 669
 670 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 671
 672
 673 extern int Manage_ro(char *devname, int fd, int readonly);
 674 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
 675 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
 676 extern int Manage_reconfig(char *devname, int fd, int layout);
 677 extern int Manage_subdevs(char *devname, int fd,
 678                           mddev_dev_t devlist, int verbose);
 679 extern int autodetect(void);
 680 extern int Grow_Add_device(char *devname, int fd, char *newdev);
 681 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
 682 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
 683                         long long size,
 684                         int level, int layout, int chunksize, int raid_disks);
 685 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
 686                         int *fdlist, int cnt, char *backup_file);
 687
 688
 689 extern int Assemble(struct supertype *st, char *mddev, int mdfd,
 690                     mddev_ident_t ident,
 691                     mddev_dev_t devlist, char *backup_file,
 692                     int readonly, int runstop,
 693                     char *update, char *homehost,
 694                     int verbose, int force);
 695
 696 extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
 697                  int raiddisks,
 698                  mddev_dev_t devlist, int assume_clean,
 699                  char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
 700
 701
 702 extern int Create(struct supertype *st, char *mddev, int mdfd,
 703                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
 704                   char *name, char *homehost, int *uuid,
 705                   int subdevs, mddev_dev_t devlist,
 706                   int runstop, int verbose, int force, int assume_clean,
 707                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
 708
 709 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
 710 extern int Query(char *dev);
 711 extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
 712                    int SparcAdjust, struct supertype *forcest, char *homehost);
 713 extern int Monitor(mddev_dev_t devlist,
 714                    char *mailaddr, char *alert_cmd,
 715                    int period, int daemonise, int scan, int oneshot,
 716                    int dosyslog, int test, char *pidfile);
 717
 718 extern int Kill(char *dev, int force, int quiet, int noexcl);
 719 extern int Wait(char *dev);
 720 extern int WaitClean(char *dev);
 721
 722 extern int Incremental(char *devname, int verbose, int runstop,
 723                        struct supertype *st, char *homehost, int autof);
 724 extern int Incremental_container(struct supertype *st, char *devname,
 725                                  int verbose, int runstop, int autof);
 726 extern void RebuildMap(void);
 727 extern int IncrementalScan(int verbose);
 728
 729 extern int CreateBitmap(char *filename, int force, char uuid[16],
 730                         unsigned long chunksize, unsigned long daemon_sleep,
 731                         unsigned long write_behind,
 732                         unsigned long long array_size,
 733                         int major);
 734 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
 735 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
 736
 737 extern int md_get_version(int fd);
 738 extern int get_linux_version(void);
 739 extern int parse_uuid(char *str, int uuid[4]);
 740 extern int check_ext2(int fd, char *name);
 741 extern int check_reiser(int fd, char *name);
 742 extern int check_raid(int fd, char *name);
 743
 744 extern int get_mdp_major(void);
 745 extern int dev_open(char *dev, int flags);
 746 extern int open_dev_excl(int devnum);
 747 extern int is_standard(char *dev, int *nump);
 748
 749 extern int parse_auto(char *str, char *msg, int config);
 750 extern mddev_ident_t conf_get_ident(char *dev);
 751 extern mddev_dev_t conf_get_devs(void);
 752 extern int conf_test_dev(char *devname);
 753 extern struct createinfo *conf_get_create_info(void);
 754 extern void set_conffile(char *file);
 755 extern char *conf_get_mailaddr(void);
 756 extern char *conf_get_mailfrom(void);
 757 extern char *conf_get_program(void);
 758 extern char *conf_get_homehost(void);
 759 extern char *conf_line(FILE *file);
 760 extern char *conf_word(FILE *file, int allow_key);
 761 extern void free_line(char *line);
 762 extern int match_oneof(char *devices, char *devname);
 763 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
 764 extern int same_uuid(int a[4], int b[4], int swapuuid);
 765 extern void copy_uuid(void *a, int b[4], int swapuuid);
 766 extern unsigned long calc_csum(void *super, int bytes);
 767 extern int enough(int level, int raid_disks, int layout, int clean,
 768                    char *avail, int avail_disks);
 769 extern int ask(char *mesg);
 770 extern unsigned long long get_component_size(int fd);
 771 extern void remove_partitions(int fd);
 772 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
 773                                    int chunksize, unsigned long long devsize);
 774 extern int flush_metadata_updates(struct supertype *st);
 775 extern void append_metadata_update(struct supertype *st, void *buf, int len);
 776
 777 extern int add_disk(int mdfd, struct supertype *st,
 778                     struct mdinfo *sra, struct mdinfo *info);
 779 extern int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info);
 780
 781 extern char *human_size(long long bytes);
 782 char *human_size_brief(long long bytes);
 783
 784 #define NoMdDev (1<<23)
 785 extern int find_free_devnum(int use_partitions);
 786
 787 extern void put_md_name(char *name);
 788 extern char *get_md_name(int dev);
 789
 790 extern char DefaultConfFile[];
 791
 792 extern int open_mddev(char *dev, int autof);
 793 extern int open_mddev_devnum(char *devname, int devnum, char *name,
 794                              char *chosen_name, int parts);
 795 extern int open_container(int fd);
 796
 797 extern int mdmon_running(int devnum);
 798 extern int signal_mdmon(int devnum);
 799 extern int env_no_mdmon(void);
 800 extern int start_mdmon(int devnum);
 801
 802 extern char *devnum2devname(int num);
 803 extern int devname2devnum(char *name);
 804 extern int stat2devnum(struct stat *st);
 805 extern int fd2devnum(int fd);
 806
 807 static inline int dev2major(int d)
 808 {
 809         if (d >= 0)
 810                 return MD_MAJOR;
 811         else
 812                 return get_mdp_major();
 813 }
 814
 815 static inline int dev2minor(int d)
 816 {
 817         if (d >= 0)
 818                 return d;
 819         return (-1-d) << MdpMinorShift;
 820 }
 821
 822 static inline int ROUND_UP(int a, int base)
 823 {
 824         return ((a+base-1)/base)*base;
 825 }
 826
 827 static inline int is_subarray(char *vers)
 828 {
 829         /* The version string for a 'subarray' (an array in a container)
 830          * is
 831          *    /containername/componentname    for normal read-write arrays
 832          *    -containername/componentname    for read-only arrays.
 833          * containername is e.g. md0, md_d1
 834          * componentname is dependant on the metadata. e.g. '1' 'S1' ...
 835          */
 836         return (*vers == '/' || *vers == '-');
 837 }
 838
 839 #define LEVEL_MULTIPATH         (-4)
 840 #define LEVEL_LINEAR            (-1)
 841 #define LEVEL_FAULTY            (-5)
 842
 843 /* kernel module doesn't know about these */
 844 #define LEVEL_CONTAINER         (-100)
 845 #define LEVEL_UNSUPPORTED       (-200)
 846
 847
 848 /* faulty stuff */
 849
 850 #define WriteTransient  0
 851 #define ReadTransient   1
 852 #define WritePersistent 2
 853 #define ReadPersistent  3
 854 #define WriteAll        4 /* doesn't go to device */
 855 #define ReadFixable     5
 856 #define Modes   6
 857
 858 #define ClearErrors     31
 859 #define ClearFaults     30
 860
 861 #define AllPersist      100 /* internal use only */
 862 #define NoPersist       101
 863
 864 #define ModeMask        0x1f
 865 #define ModeShift       5
 866
 867
 868 #ifdef __TINYC__
 869 #undef minor
 870 #undef major
 871 #undef makedev
 872 #define minor(x) ((x)&0xff)
 873 #define major(x) (((x)>>8)&0xff)
 874 #define makedev(M,m) (((M)<<8) | (m))
 875 #endif
 876
 877 /* for raid5 */
 878 #define ALGORITHM_LEFT_ASYMMETRIC       0
 879 #define ALGORITHM_RIGHT_ASYMMETRIC      1
 880 #define ALGORITHM_LEFT_SYMMETRIC        2
 881 #define ALGORITHM_RIGHT_SYMMETRIC       3