mdadm.h

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@suse.de>
  23  */
  24
  25 #define _GNU_SOURCE
  26 #define _FILE_OFFSET_BITS 64
  27 #include        <unistd.h>
  28 #if !defined(__dietlibc__) && !defined(__KLIBC__)
  29 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
  30 #else
  31 # if defined(__NO_STAT64) || __WORDSIZE != 32
  32 # define lseek64 lseek
  33 # endif
  34 #endif
  35
  36 #include        <sys/types.h>
  37 #include        <sys/stat.h>
  38 #include        <stdlib.h>
  39 #include        <time.h>
  40 #include        <sys/time.h>
  41 #include        <getopt.h>
  42 #include        <fcntl.h>
  43 #include        <stdio.h>
  44 #include        <errno.h>
  45 #include        <string.h>
  46 #include        <syslog.h>
  47 #ifdef __dietlibc__
  48 #include        <strings.h>
  49 /* dietlibc has deprecated random and srandom!! */
  50 #define random rand
  51 #define srandom srand
  52 #endif
  53
  54
  55 #include        <linux/kdev_t.h>
  56 /*#include      <linux/fs.h> */
  57 #include        <sys/mount.h>
  58 #include        <asm/types.h>
  59 #include        <sys/ioctl.h>
  60 #define MD_MAJOR 9
  61 #define MdpMinorShift 6
  62
  63 #ifndef BLKGETSIZE64
  64 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  65 #endif
  66
  67 #define DEFAULT_BITMAP_CHUNK 4096
  68 #define DEFAULT_BITMAP_DELAY 5
  69 #define DEFAULT_MAX_WRITE_BEHIND 256
  70
  71 #include        "md_u.h"
  72 #include        "md_p.h"
  73 #include        "bitmap.h"
  74 #include        "msg.h"
  75
  76 #include <endian.h>
  77 /* Redhat don't like to #include <asm/byteorder.h>, and
  78  * some time include <linux/byteorder/xxx_endian.h> isn't enough,
  79  * and there is no standard conversion function so... */
  80 /* And dietlibc doesn't think byteswap is ok, so.. */
  81 /*  #include <byteswap.h> */
  82 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
  83                      ((x) & 0xff00U) >> 8)
  84 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
  85                      ((x) & 0xff000000U) >> 24 | \
  86                      ((x) & 0x0000ff00U) << 8  | \
  87                      ((x) & 0x00ff0000U) >> 8)
  88 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
  89                      ((x) & 0xff00000000000000ULL) >> 56 | \
  90                      ((x) & 0x000000000000ff00ULL) << 40 | \
  91                      ((x) & 0x00ff000000000000ULL) >> 40 | \
  92                      ((x) & 0x0000000000ff0000ULL) << 24 | \
  93                      ((x) & 0x0000ff0000000000ULL) >> 24 | \
  94                      ((x) & 0x00000000ff000000ULL) << 8 | \
  95                      ((x) & 0x000000ff00000000ULL) >> 8)
  96
  97 #if !defined(__KLIBC__)
  98 #if BYTE_ORDER == LITTLE_ENDIAN
  99 #define __cpu_to_le16(_x) (_x)
 100 #define __cpu_to_le32(_x) (_x)
 101 #define __cpu_to_le64(_x) (_x)
 102 #define __le16_to_cpu(_x) (_x)
 103 #define __le32_to_cpu(_x) (_x)
 104 #define __le64_to_cpu(_x) (_x)
 105
 106 #define __cpu_to_be16(_x) bswap_16(_x)
 107 #define __cpu_to_be32(_x) bswap_32(_x)
 108 #define __cpu_to_be64(_x) bswap_64(_x)
 109 #define __be16_to_cpu(_x) bswap_16(_x)
 110 #define __be32_to_cpu(_x) bswap_32(_x)
 111 #define __be64_to_cpu(_x) bswap_64(_x)
 112 #elif BYTE_ORDER == BIG_ENDIAN
 113 #define __cpu_to_le16(_x) bswap_16(_x)
 114 #define __cpu_to_le32(_x) bswap_32(_x)
 115 #define __cpu_to_le64(_x) bswap_64(_x)
 116 #define __le16_to_cpu(_x) bswap_16(_x)
 117 #define __le32_to_cpu(_x) bswap_32(_x)
 118 #define __le64_to_cpu(_x) bswap_64(_x)
 119
 120 #define __cpu_to_be16(_x) (_x)
 121 #define __cpu_to_be32(_x) (_x)
 122 #define __cpu_to_be64(_x) (_x)
 123 #define __be16_to_cpu(_x) (_x)
 124 #define __be32_to_cpu(_x) (_x)
 125 #define __be64_to_cpu(_x) (_x)
 126 #else
 127 #  error "unknown endianness."
 128 #endif
 129 #endif /* __KLIBC__ */
 130
 131
 132
 133 /* general information that might be extracted from a superblock */
 134 struct mdinfo {
 135         mdu_array_info_t        array;
 136         mdu_disk_info_t         disk;
 137         __u64                   events;
 138         int                     uuid[4];
 139         char                    name[33];
 140         unsigned long long      data_offset;
 141         unsigned long long      component_size; /* same as array.size, except in
 142                                                  * sectors and up to 64bits.
 143                                                  */
 144         unsigned long long      custom_array_size; /* size for non-default sized
 145                                                     * arrays (in sectors)
 146                                                     */
 147         int                     reshape_active;
 148         unsigned long long      reshape_progress;
 149         unsigned long long      resync_start;
 150         unsigned long           safe_mode_delay; /* ms delay to mark clean */
 151         int                     new_level, delta_disks, new_layout, new_chunk;
 152         int                     errors;
 153         int                     cache_size; /* size of raid456 stripe cache*/
 154         int                     mismatch_cnt;
 155         char                    text_version[50];
 156         void                    *update_private; /* for passing metadata-format
 157                                                   * specific update data
 158                                                   * between successive calls to
 159                                                   * update_super()
 160                                                   */
 161
 162         int container_member; /* for assembling external-metatdata arrays
 163                                * This is to be used internally by metadata
 164                                * handler only */
 165
 166         char            sys_name[20];
 167         struct mdinfo *devs;
 168         struct mdinfo *next;
 169
 170         /* Device info for mdmon: */
 171         int state_fd;
 172         #define DS_FAULTY       1
 173         #define DS_INSYNC       2
 174         #define DS_WRITE_MOSTLY 4
 175         #define DS_SPARE        8
 176         #define DS_BLOCKED      16
 177         #define DS_REMOVE       1024
 178         #define DS_UNBLOCK      2048
 179         int prev_state, curr_state, next_state;
 180
 181 };
 182
 183 struct createinfo {
 184         int     uid;
 185         int     gid;
 186         int     autof;
 187         int     mode;
 188         int     symlinks;
 189         struct supertype *supertype;
 190 };
 191
 192 #define Name "mdadm"
 193
 194 enum mode {
 195         ASSEMBLE=1,
 196         BUILD,
 197         CREATE,
 198         MANAGE,
 199         MISC,
 200         MONITOR,
 201         GROW,
 202         INCREMENTAL,
 203         AUTODETECT,
 204 };
 205
 206 extern char short_options[];
 207 extern char short_bitmap_options[];
 208 extern char short_bitmap_auto_options[];
 209 extern struct option long_options[];
 210 extern char Version[], Usage[], Help[], OptionHelp[],
 211         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 212         Help_incr[],
 213         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 214
 215 /* for option that don't have short equivilents, we assign arbitrary
 216  * small numbers.  '1' means an undecorated option, so we start at '2'.
 217  */
 218 enum special_options {
 219         AssumeClean = 2,
 220         BitmapChunk,
 221         WriteBehind,
 222         ReAdd,
 223         NoDegraded,
 224         Sparc22,
 225         BackupFile,
 226         HomeHost,
 227         AutoHomeHost,
 228         Symlinks,
 229         AutoDetect,
 230         Waitclean,
 231         DetailPlatform,
 232 };
 233
 234 /* structures read from config file */
 235 /* List of mddevice names and identifiers
 236  * Identifiers can be:
 237  *    uuid=128-hex-uuid
 238  *    super-minor=decimal-minor-number-from-superblock
 239  *    devices=comma,separated,list,of,device,names,with,wildcards
 240  *
 241  * If multiple fields are present, the intersection of all matching
 242  * devices is considered
 243  */
 244 #define UnSet (0xfffe)
 245 typedef struct mddev_ident_s {
 246         char    *devname;
 247
 248         int     uuid_set;
 249         int     uuid[4];
 250         char    name[33];
 251
 252         unsigned int super_minor;
 253
 254         char    *devices;       /* comma separated list of device
 255                                  * names with wild cards
 256                                  */
 257         int     level;
 258         unsigned int raid_disks;
 259         unsigned int spare_disks;
 260         struct supertype *st;
 261         int     autof;          /* 1 for normal, 2 for partitioned */
 262         char    *spare_group;
 263         char    *bitmap_file;
 264         int     bitmap_fd;
 265
 266         char    *container;     /* /dev/whatever name of container, or
 267                                  * uuid of container.  You would expect
 268                                  * this to be the 'devname' or UUID
 269                                  * of some other entry.
 270                                  */
 271         char    *member;        /* subarray within a container */
 272
 273         struct mddev_ident_s *next;
 274 } *mddev_ident_t;
 275
 276 /* List of device names - wildcards expanded */
 277 typedef struct mddev_dev_s {
 278         char *devname;
 279         char disposition;       /* 'a' for add, 'r' for remove, 'f' for fail.
 280                                  * Not set for names read from .config
 281                                  */
 282         char writemostly;       /* 1 for 'set writemostly', 2 for 'clear writemostly' */
 283         char re_add;
 284         char used;              /* set when used */
 285         struct mdinfo *content; /* If devname is a container, this might list
 286                                  * the remaining member arrays. */
 287         struct mddev_dev_s *next;
 288 } *mddev_dev_t;
 289
 290 typedef struct mapping {
 291         char *name;
 292         int num;
 293 } mapping_t;
 294
 295
 296 struct mdstat_ent {
 297         char            *dev;
 298         int             devnum;
 299         int             active;
 300         char            *level;
 301         char            *pattern; /* U or up, _ for down */
 302         int             percent; /* -1 if no resync */
 303         int             resync; /* 1 if resync, 0 if recovery */
 304         int             devcnt;
 305         int             raid_disks;
 306         int             chunk_size;
 307         char *          metadata_version;
 308         struct mdstat_ent *next;
 309 };
 310
 311 extern struct mdstat_ent *mdstat_read(int hold, int start);
 312 extern void free_mdstat(struct mdstat_ent *ms);
 313 extern void mdstat_wait(int seconds);
 314 extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
 315 extern int mddev_busy(int devnum);
 316
 317 struct map_ent {
 318         struct map_ent *next;
 319         int     devnum;
 320         char    metadata[20];
 321         int     uuid[4];
 322         int     bad;
 323         char    *path;
 324 };
 325 extern int map_update(struct map_ent **mpp, int devnum, char *metadata,
 326                       int uuid[4], char *path);
 327 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
 328 extern struct map_ent *map_by_devnum(struct map_ent **map, int devnum);
 329 extern struct map_ent *map_by_name(struct map_ent **map, char *name);
 330 extern void map_read(struct map_ent **melp);
 331 extern int map_write(struct map_ent *mel);
 332 extern void map_delete(struct map_ent **mapp, int devnum);
 333 extern void map_free(struct map_ent *map);
 334 extern void map_add(struct map_ent **melp,
 335                     int devnum, char *metadata, int uuid[4], char *path);
 336 extern int map_lock(struct map_ent **melp);
 337 extern void map_unlock(struct map_ent **melp);
 338
 339 /* various details can be requested */
 340 enum sysfs_read_flags {
 341         GET_LEVEL       = (1 << 0),
 342         GET_LAYOUT      = (1 << 1),
 343         GET_COMPONENT   = (1 << 2),
 344         GET_CHUNK       = (1 << 3),
 345         GET_CACHE       = (1 << 4),
 346         GET_MISMATCH    = (1 << 5),
 347         GET_VERSION     = (1 << 6),
 348         GET_DISKS       = (1 << 7),
 349         GET_DEGRADED    = (1 << 8),
 350         GET_SAFEMODE    = (1 << 9),
 351         GET_DEVS        = (1 << 10), /* gets role, major, minor */
 352         GET_OFFSET      = (1 << 11),
 353         GET_SIZE        = (1 << 12),
 354         GET_STATE       = (1 << 13),
 355         GET_ERROR       = (1 << 14),
 356         SKIP_GONE_DEVS  = (1 << 15),
 357 };
 358
 359 /* If fd >= 0, get the array it is open on,
 360  * else use devnum. >=0 -> major9. <0.....
 361  */
 362 extern int sysfs_open(int devnum, char *devname, char *attr);
 363 extern void sysfs_init(struct mdinfo *mdi, int fd, int devnum);
 364 extern void sysfs_free(struct mdinfo *sra);
 365 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
 366 extern int sysfs_attr_match(const char *attr, const char *str);
 367 extern int sysfs_match_word(const char *word, char **list);
 368 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 369                          char *name, char *val);
 370 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 371                          char *name, unsigned long long val);
 372 extern int sysfs_uevent(struct mdinfo *sra, char *event);
 373 extern int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev,
 374                         char *name);
 375 extern int sysfs_fd_get_ll(int fd, unsigned long long *val);
 376 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 377                         char *name, unsigned long long *val);
 378 extern int sysfs_fd_get_str(int fd, char *val, int size);
 379 extern int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev,
 380                          char *name, char *val, int size);
 381 extern int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms);
 382 extern int sysfs_set_array(struct mdinfo *info, int vers);
 383 extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd,
 384                           int in_sync);
 385 extern int sysfs_disk_to_scsi_id(int fd, __u32 *id);
 386 extern int sysfs_unique_holder(int devnum, long rdev);
 387 extern int load_sys(char *path, char *buf);
 388
 389
 390 extern int save_stripes(int *source, unsigned long long *offsets,
 391                         int raid_disks, int chunk_size, int level, int layout,
 392                         int nwrites, int *dest,
 393                         unsigned long long start, unsigned long long length,
 394                         char *buf);
 395 extern int restore_stripes(int *dest, unsigned long long *offsets,
 396                            int raid_disks, int chunk_size, int level, int layout,
 397                            int source, unsigned long long read_offset,
 398                            unsigned long long start, unsigned long long length);
 399
 400 #ifndef Sendmail
 401 #define Sendmail "/usr/lib/sendmail -t"
 402 #endif
 403
 404 #define SYSLOG_FACILITY LOG_DAEMON
 405
 406 extern char *map_num(mapping_t *map, int num);
 407 extern int map_name(mapping_t *map, char *name);
 408 extern mapping_t r5layout[], r6layout[], pers[], modes[], faultylayout[];
 409
 410 extern char *map_dev(int major, int minor, int create);
 411
 412 struct active_array;
 413 struct metadata_update;
 414
 415 /* A superswitch provides entry point the a metadata handler.
 416  *
 417  * The super_switch primarily operates on some "metadata" that
 418  * is accessed via the 'supertype'.
 419  * This metadata has one of three possible sources.
 420  * 1/ It is read from a single device.  In this case it may not completely
 421  *    describe the array or arrays as some information might be on other
 422  *    devices.
 423  * 2/ It is read from all devices in a container.  In this case all
 424  *    information is present.
 425  * 3/ It is created by ->init_super / ->add_to_super.  In this case it will
 426  *    be complete once enough ->add_to_super calls have completed.
 427  *
 428  * When creating an array inside a container, the metadata will be
 429  * formed by a combination of 2 and 3.  The metadata or the array is read,
 430  * then new information is added.
 431  *
 432  * The metadata must sometimes have a concept of a 'current' array
 433  * and a 'current' device.
 434  * The 'current' array is set by init_super to be the newly created array,
 435  * or is set by super_by_fd when it finds it is looking at an array inside
 436  * a container.
 437  *
 438  * The 'current' device is either the device that the metadata was read from
 439  * in case 1, or the last device added by add_to_super in case 3.
 440  * Case 2 does not identify a 'current' device.
 441  */
 442 extern struct superswitch {
 443
 444         /* Used to report details of metadata read from a component
 445          * device. ->load_super has been called.
 446          */
 447         void (*examine_super)(struct supertype *st, char *homehost);
 448         void (*brief_examine_super)(struct supertype *st, int verbose);
 449         void (*brief_examine_subarrays)(struct supertype *st, int verbose);
 450         void (*export_examine_super)(struct supertype *st);
 451
 452         /* Used to report details of an active array.
 453          * ->load_super was possibly given a 'component' string.
 454          */
 455         void (*detail_super)(struct supertype *st, char *homehost);
 456         void (*brief_detail_super)(struct supertype *st);
 457         void (*export_detail_super)(struct supertype *st);
 458
 459         /* Optional: platform hardware / firmware details */
 460         int (*detail_platform)(int verbose, int enumerate_only);
 461
 462         /* Used:
 463          *   to get uuid to storing in bitmap metadata
 464          *   and 'reshape' backup-data metadata
 465          *   To see if a device is being re-added to an array it was part of.
 466          */
 467         void (*uuid_from_super)(struct supertype *st, int uuid[4]);
 468
 469         /* Extract generic details from metadata.  This could be details about
 470          * the container, or about an individual array within the container.
 471          * The determination is made either by:
 472          *   load_super being given a 'component' string.
 473          *   validate_geometry determining what to create.
 474          * The info includes both array information and device information.
 475          * The particular device should be:
 476          *   The last device added by add_to_super
 477          *   The device the metadata was loaded from by load_super
 478          */
 479         void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
 480
 481         /* Check if the given metadata is flagged as belonging to "this"
 482          * host.  0 for 'no', 1 for 'yes', -1 for "Don't record homehost"
 483          */
 484         int (*match_home)(struct supertype *st, char *homehost);
 485
 486         /* Make one of several generic modifications to metadata
 487          * prior to assembly (or other times).
 488          *   sparc2.2  - first bug in early 0.90 metadata
 489          *   super-minor - change name of 0.90 metadata
 490          *   summaries - 'correct' any redundant data
 491          *   resync - mark array as dirty to trigger a resync.
 492          *   uuid - set new uuid - only 0.90 or 1.x
 493          *   name - change the name of the array (where supported)
 494          *   homehost - change which host this array is tied to.
 495          *   devicesize - If metadata is at start of device, change recorded
 496          *               device size to match actual device size
 497          *   byteorder - swap bytes for 0.90 metadata
 498          *
 499          *   force-one  - mark that device as uptodate, not old or failed.
 500          *   force-array - mark array as clean if it would not otherwise
 501          *               assemble
 502          *   assemble   - not sure how this is different from force-one...
 503          *   linear-grow-new - add a new device to a linear array, but don't
 504          *                   change the size: so superblock still matches
 505          *   linear-grow-update - now change the size of the array.
 506          */
 507         int (*update_super)(struct supertype *st, struct mdinfo *info,
 508                             char *update,
 509                             char *devname, int verbose,
 510                             int uuid_set, char *homehost);
 511
 512         /* Create new metadata for new array as described.  This could
 513          * be a new container, or an array in a pre-existing container.
 514          * Also used to zero metadata prior to writing it to invalidate old
 515          * metadata.
 516          */
 517         int (*init_super)(struct supertype *st, mdu_array_info_t *info,
 518                           unsigned long long size, char *name,
 519                           char *homehost, int *uuid);
 520
 521         /* update the metadata to include new device, either at create or
 522          * when hot-adding a spare.
 523          */
 524         int (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
 525                              int fd, char *devname);
 526
 527         /* Write metadata to one device when fixing problems or adding
 528          * a new device.
 529          */
 530         int (*store_super)(struct supertype *st, int fd);
 531
 532         /*  Write all metadata for this array.
 533          */
 534         int (*write_init_super)(struct supertype *st);
 535         int (*compare_super)(struct supertype *st, struct supertype *tst);
 536         int (*load_super)(struct supertype *st, int fd, char *devname);
 537         struct supertype * (*match_metadata_desc)(char *arg);
 538         __u64 (*avail_size)(struct supertype *st, __u64 size);
 539         int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
 540                                    int delay, int write_behind,
 541                                    unsigned long long size, int may_change, int major);
 542         void (*locate_bitmap)(struct supertype *st, int fd);
 543         int (*write_bitmap)(struct supertype *st, int fd);
 544         void (*free_super)(struct supertype *st);
 545
 546         /* validate_geometry is called with an st returned by
 547          * match_metadata_desc.
 548          * It should check that the geometry described in compatible with
 549          * the metadata type.  It will be called repeatedly as devices
 550          * added to validate changing size and new devices.  If there are
 551          * inter-device dependencies, it should record sufficient details
 552          * so these can be validated.
 553          * Both 'size' and '*freesize' are in sectors.  chunk is bytes.
 554          */
 555         int (*validate_geometry)(struct supertype *st, int level, int layout,
 556                                  int raiddisks,
 557                                  int chunk, unsigned long long size,
 558                                  char *subdev, unsigned long long *freesize,
 559                                  int verbose);
 560
 561         struct mdinfo *(*container_content)(struct supertype *st);
 562         /* Allow a metadata handler to override mdadm's default layouts */
 563         int (*default_layout)(int level); /* optional */
 564
 565 /* for mdmon */
 566         int (*open_new)(struct supertype *c, struct active_array *a,
 567                         char *inst);
 568
 569         /* Tell the metadata handler the current state of the array.
 570          * This covers whether it is known to be consistent (no pending writes)
 571          * and how far along a resync is known to have progressed
 572          * (in a->resync_start).
 573          * resync status is really irrelevant if the array is not consistent,
 574          * but some metadata (DDF!) have a place to record the distinction.
 575          * If 'consistent' is '2', then the array can mark it dirty if a
 576          * resync/recovery/whatever is required, or leave it clean if not.
 577          * Return value is 0 dirty (not consistent) and 1 if clean.
 578          * it is only really important if consistent is passed in as '2'.
 579          */
 580         int (*set_array_state)(struct active_array *a, int consistent);
 581
 582         /* When the state of a device might have changed, we call set_disk to
 583          * tell the metadata what the current state is.
 584          * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
 585          * transitions.
 586          * set_disk might be called when the state of the particular disk has
 587          * not in fact changed.
 588          */
 589         void (*set_disk)(struct active_array *a, int n, int state);
 590         void (*sync_metadata)(struct supertype *st);
 591         void (*process_update)(struct supertype *st,
 592                                struct metadata_update *update);
 593         void (*prepare_update)(struct supertype *st,
 594                                struct metadata_update *update);
 595
 596         /* activate_spare will check if the array is degraded and, if it
 597          * is, try to find some spare space in the container.
 598          * On success, it add appropriate updates (For process_update) to
 599          * to the 'updates' list and returns a list of 'mdinfo' identifying
 600          * the device, or devices as there might be multiple missing
 601          * devices and multiple spares available.
 602          */
 603         struct mdinfo *(*activate_spare)(struct active_array *a,
 604                                          struct metadata_update **updates);
 605
 606         int swapuuid; /* true if uuid is bigending rather than hostendian */
 607         int external;
 608         const char *name; /* canonical metadata name */
 609 } super0, super1, super_ddf, *superlist[];
 610
 611 extern struct superswitch super_imsm;
 612
 613 struct metadata_update {
 614         int     len;
 615         char    *buf;
 616         void    *space; /* allocated space that monitor will use */
 617         struct metadata_update *next;
 618 };
 619
 620 /* A supertype holds a particular collection of metadata.
 621  * It identifies the metadata type by the superswitch, and the particular
 622  * sub-version of that metadata type.
 623  * metadata read in or created is stored in 'sb' and 'info'.
 624  * There are also fields used by mdmon to track containers.
 625  *
 626  * A supertype may refer to:
 627  *   Just an array, possibly in a container
 628  *   A container, not identifying any particular array
 629  *   Info read from just one device, not yet fully describing the array/container.
 630  *
 631  *
 632  * A supertype is created by:
 633  *   super_by_fd
 634  *   guess_super
 635  *   dup_super
 636  */
 637 struct supertype {
 638         struct superswitch *ss;
 639         int minor_version;
 640         int max_devs;
 641         int container_dev;    /* devnum of container */
 642         char subarray[32];      /* name of array inside container */
 643         void *sb;
 644         void *info;
 645         int loaded_container;   /* Set if load_super found a container,
 646                                  * not just one device */
 647
 648         struct metadata_update *updates;
 649         struct metadata_update **update_tail;
 650
 651         /* extra stuff used by mdmon */
 652         struct active_array *arrays;
 653         int sock; /* listen to external programs */
 654         int devnum;
 655         char *devname; /* e.g. md0.  This appears in metadata_verison:
 656                         *  external:/md0/12
 657                         */
 658         int devcnt;
 659
 660         struct mdinfo *devs;
 661
 662 };
 663
 664 extern struct supertype *super_by_fd(int fd);
 665 extern struct supertype *guess_super(int fd);
 666 extern struct supertype *dup_super(struct supertype *st);
 667 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 668 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 669                          mdu_disk_info_t *disk);
 670 void wait_for(char *dev, int fd);
 671
 672 #if __GNUC__ < 3
 673 struct stat64;
 674 #endif
 675
 676 #define HAVE_NFTW  we assume
 677 #define HAVE_FTW
 678
 679 #ifdef __UCLIBC__
 680 # include <features.h>
 681 # ifndef __UCLIBC_HAS_LFS__
 682 #  define lseek64 lseek
 683 # endif
 684 # ifndef  __UCLIBC_HAS_FTW__
 685 #  undef HAVE_FTW
 686 #  undef HAVE_NFTW
 687 # endif
 688 #endif
 689
 690 #ifdef __dietlibc__
 691 # undef HAVE_NFTW
 692 #endif
 693
 694 #if defined(__KLIBC__)
 695 # undef HAVE_NFTW
 696 # undef HAVE_FTW
 697 #endif
 698
 699 #ifndef HAVE_NFTW
 700 # define FTW_PHYS 1
 701 # ifndef HAVE_FTW
 702   struct FTW {};
 703 # endif
 704 #endif
 705
 706 #ifdef HAVE_FTW
 707 # include <ftw.h>
 708 #endif
 709
 710 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 711
 712
 713 extern int Manage_ro(char *devname, int fd, int readonly);
 714 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
 715 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
 716 extern int Manage_subdevs(char *devname, int fd,
 717                           mddev_dev_t devlist, int verbose);
 718 extern int autodetect(void);
 719 extern int Grow_Add_device(char *devname, int fd, char *newdev);
 720 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
 721 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
 722                         long long size,
 723                         int level, char *layout_str, int chunksize, int raid_disks);
 724 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
 725                         int *fdlist, int cnt, char *backup_file, int verbose);
 726 extern int Grow_continue(int mdfd, struct supertype *st,
 727                          struct mdinfo *info, char *backup_file);
 728
 729 extern int Assemble(struct supertype *st, char *mddev,
 730                     mddev_ident_t ident,
 731                     mddev_dev_t devlist, char *backup_file,
 732                     int readonly, int runstop,
 733                     char *update, char *homehost, int require_homehost,
 734                     int verbose, int force);
 735
 736 extern int Build(char *mddev, int chunk, int level, int layout,
 737                  int raiddisks, mddev_dev_t devlist, int assume_clean,
 738                  char *bitmap_file, int bitmap_chunk, int write_behind,
 739                  int delay, int verbose, int autof, unsigned long long size);
 740
 741
 742 extern int Create(struct supertype *st, char *mddev,
 743                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
 744                   char *name, char *homehost, int *uuid,
 745                   int subdevs, mddev_dev_t devlist,
 746                   int runstop, int verbose, int force, int assume_clean,
 747                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int autof);
 748
 749 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
 750 extern int Detail_Platform(struct superswitch *ss, int scan, int verbose);
 751 extern int Query(char *dev);
 752 extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
 753                    int SparcAdjust, struct supertype *forcest, char *homehost);
 754 extern int Monitor(mddev_dev_t devlist,
 755                    char *mailaddr, char *alert_cmd,
 756                    int period, int daemonise, int scan, int oneshot,
 757                    int dosyslog, int test, char *pidfile, int increments);
 758
 759 extern int Kill(char *dev, struct supertype *st, int force, int quiet, int noexcl);
 760 extern int Wait(char *dev);
 761 extern int WaitClean(char *dev, int sock, int verbose);
 762
 763 extern int Incremental(char *devname, int verbose, int runstop,
 764                        struct supertype *st, char *homehost, int require_homehost,
 765                        int autof);
 766 extern int Incremental_container(struct supertype *st, char *devname,
 767                                  int verbose, int runstop, int autof,
 768                                  int trustworthy);
 769 extern void RebuildMap(void);
 770 extern int IncrementalScan(int verbose);
 771
 772 extern int CreateBitmap(char *filename, int force, char uuid[16],
 773                         unsigned long chunksize, unsigned long daemon_sleep,
 774                         unsigned long write_behind,
 775                         unsigned long long array_size,
 776                         int major);
 777 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
 778 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
 779 extern unsigned long bitmap_sectors(struct bitmap_super_s *bsb);
 780
 781 extern int md_get_version(int fd);
 782 extern int get_linux_version(void);
 783 extern long long parse_size(char *size);
 784 extern int parse_uuid(char *str, int uuid[4]);
 785 extern int parse_layout_10(char *layout);
 786 extern int parse_layout_faulty(char *layout);
 787 extern int check_ext2(int fd, char *name);
 788 extern int check_reiser(int fd, char *name);
 789 extern int check_raid(int fd, char *name);
 790
 791 extern int get_mdp_major(void);
 792 extern int dev_open(char *dev, int flags);
 793 extern int open_dev(int devnum);
 794 extern int open_dev_excl(int devnum);
 795 extern int is_standard(char *dev, int *nump);
 796 extern int same_dev(char *one, char *two);
 797
 798 extern int parse_auto(char *str, char *msg, int config);
 799 extern mddev_ident_t conf_get_ident(char *dev);
 800 extern mddev_dev_t conf_get_devs(void);
 801 extern int conf_test_dev(char *devname);
 802 extern int conf_test_metadata(const char *version);
 803 extern struct createinfo *conf_get_create_info(void);
 804 extern void set_conffile(char *file);
 805 extern char *conf_get_mailaddr(void);
 806 extern char *conf_get_mailfrom(void);
 807 extern char *conf_get_program(void);
 808 extern char *conf_get_homehost(int *require_homehostp);
 809 extern char *conf_line(FILE *file);
 810 extern char *conf_word(FILE *file, int allow_key);
 811 extern int conf_name_is_free(char *name);
 812 extern int devname_matches(char *name, char *match);
 813 extern struct mddev_ident_s *conf_match(struct mdinfo *info, struct supertype *st);
 814
 815 extern void free_line(char *line);
 816 extern int match_oneof(char *devices, char *devname);
 817 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
 818 extern const int uuid_match_any[4];
 819 extern int same_uuid(int a[4], int b[4], int swapuuid);
 820 extern void copy_uuid(void *a, int b[4], int swapuuid);
 821 extern char *__fname_from_uuid(int id[4], int swap, char *buf, char sep);
 822 extern char *fname_from_uuid(struct supertype *st,
 823                              struct mdinfo *info, char *buf, char sep);
 824 extern unsigned long calc_csum(void *super, int bytes);
 825 extern int enough(int level, int raid_disks, int layout, int clean,
 826                    char *avail, int avail_disks);
 827 extern int ask(char *mesg);
 828 extern unsigned long long get_component_size(int fd);
 829 extern void remove_partitions(int fd);
 830 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
 831                                    int chunksize, unsigned long long devsize);
 832 extern int flush_metadata_updates(struct supertype *st);
 833 extern void append_metadata_update(struct supertype *st, void *buf, int len);
 834 extern int assemble_container_content(struct supertype *st, int mdfd,
 835                                       struct mdinfo *content, int runstop,
 836                                       char *chosen_name, int verbose);
 837
 838 extern int add_disk(int mdfd, struct supertype *st,
 839                     struct mdinfo *sra, struct mdinfo *info);
 840 extern int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info);
 841
 842 extern char *human_size(long long bytes);
 843 extern char *human_size_brief(long long bytes);
 844 extern void print_r10_layout(int layout);
 845
 846 #define NoMdDev (1<<23)
 847 extern int find_free_devnum(int use_partitions);
 848
 849 extern void put_md_name(char *name);
 850 extern char *get_md_name(int dev);
 851
 852 extern char DefaultConfFile[];
 853
 854 extern int create_mddev(char *dev, char *name, int autof, int trustworthy,
 855                         char *chosen);
 856 /* values for 'trustworthy' */
 857 #define LOCAL   1
 858 #define FOREIGN 2
 859 #define METADATA 3
 860 extern int open_mddev(char *dev, int report_errors);
 861 extern int open_container(int fd);
 862
 863 extern int mdmon_running(int devnum);
 864 extern int signal_mdmon(int devnum);
 865 extern int check_env(char *name);
 866 extern __u32 random32(void);
 867 extern int start_mdmon(int devnum);
 868
 869 extern char *devnum2devname(int num);
 870 extern int devname2devnum(char *name);
 871 extern int stat2devnum(struct stat *st);
 872 extern int fd2devnum(int fd);
 873
 874 static inline int dev2major(int d)
 875 {
 876         if (d >= 0)
 877                 return MD_MAJOR;
 878         else
 879                 return get_mdp_major();
 880 }
 881
 882 static inline int dev2minor(int d)
 883 {
 884         if (d >= 0)
 885                 return d;
 886         return (-1-d) << MdpMinorShift;
 887 }
 888
 889 static inline int ROUND_UP(int a, int base)
 890 {
 891         return ((a+base-1)/base)*base;
 892 }
 893
 894 static inline int is_subarray(char *vers)
 895 {
 896         /* The version string for a 'subarray' (an array in a container)
 897          * is
 898          *    /containername/componentname    for normal read-write arrays
 899          *    -containername/componentname    for read-only arrays.
 900          * containername is e.g. md0, md_d1
 901          * componentname is dependant on the metadata. e.g. '1' 'S1' ...
 902          */
 903         return (*vers == '/' || *vers == '-');
 904 }
 905
 906 #ifdef DEBUG
 907 #define dprintf(fmt, arg...) \
 908         fprintf(stderr, fmt, ##arg)
 909 #else
 910 #define dprintf(fmt, arg...) \
 911         ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
 912 #endif
 913 #include <assert.h>
 914 #include <stdarg.h>
 915 static inline int xasprintf(char **strp, const char *fmt, ...) {
 916         va_list ap;
 917         int ret;
 918         va_start(ap, fmt);
 919         ret = vasprintf(strp, fmt, ap);
 920         va_end(ap);
 921         assert(ret >= 0);
 922         return ret;
 923 }
 924
 925 #define LEVEL_MULTIPATH         (-4)
 926 #define LEVEL_LINEAR            (-1)
 927 #define LEVEL_FAULTY            (-5)
 928
 929 /* kernel module doesn't know about these */
 930 #define LEVEL_CONTAINER         (-100)
 931 #define LEVEL_UNSUPPORTED       (-200)
 932
 933
 934 /* faulty stuff */
 935
 936 #define WriteTransient  0
 937 #define ReadTransient   1
 938 #define WritePersistent 2
 939 #define ReadPersistent  3
 940 #define WriteAll        4 /* doesn't go to device */
 941 #define ReadFixable     5
 942 #define Modes   6
 943
 944 #define ClearErrors     31
 945 #define ClearFaults     30
 946
 947 #define AllPersist      100 /* internal use only */
 948 #define NoPersist       101
 949
 950 #define ModeMask        0x1f
 951 #define ModeShift       5
 952
 953
 954 #ifdef __TINYC__
 955 #undef minor
 956 #undef major
 957 #undef makedev
 958 #define minor(x) ((x)&0xff)
 959 #define major(x) (((x)>>8)&0xff)
 960 #define makedev(M,m) (((M)<<8) | (m))
 961 #endif
 962
 963 /* for raid4/5/6 */
 964 #define ALGORITHM_LEFT_ASYMMETRIC       0
 965 #define ALGORITHM_RIGHT_ASYMMETRIC      1
 966 #define ALGORITHM_LEFT_SYMMETRIC        2
 967 #define ALGORITHM_RIGHT_SYMMETRIC       3
 968
 969 /* Define non-rotating (raid4) algorithms.  These allow
 970  * conversion of raid4 to raid5.
 971  */
 972 #define ALGORITHM_PARITY_0              4 /* P or P,Q are initial devices */
 973 #define ALGORITHM_PARITY_N              5 /* P or P,Q are final devices. */
 974
 975 /* DDF RAID6 layouts differ from md/raid6 layouts in two ways.
 976  * Firstly, the exact positioning of the parity block is slightly
 977  * different between the 'LEFT_*' modes of md and the "_N_*" modes
 978  * of DDF.
 979  * Secondly, or order of datablocks over which the Q syndrome is computed
 980  * is different.
 981  * Consequently we have different layouts for DDF/raid6 than md/raid6.
 982  * These layouts are from the DDFv1.2 spec.
 983  * Interestingly DDFv1.2-Errata-A does not specify N_CONTINUE but
 984  * leaves RLQ=3 as 'Vendor Specific'
 985  */
 986
 987 #define ALGORITHM_ROTATING_ZERO_RESTART 8 /* DDF PRL=6 RLQ=1 */
 988 #define ALGORITHM_ROTATING_N_RESTART    9 /* DDF PRL=6 RLQ=2 */
 989 #define ALGORITHM_ROTATING_N_CONTINUE   10 /*DDF PRL=6 RLQ=3 */
 990
 991
 992 /* For every RAID5 algorithm we define a RAID6 algorithm
 993  * with exactly the same layout for data and parity, and
 994  * with the Q block always on the last device (N-1).
 995  * This allows trivial conversion from RAID5 to RAID6
 996  */
 997 #define ALGORITHM_LEFT_ASYMMETRIC_6     16
 998 #define ALGORITHM_RIGHT_ASYMMETRIC_6    17
 999 #define ALGORITHM_LEFT_SYMMETRIC_6      18
1000 #define ALGORITHM_RIGHT_SYMMETRIC_6     19
1001 #define ALGORITHM_PARITY_0_6            20
1002 #define ALGORITHM_PARITY_N_6            ALGORITHM_PARITY_N
1003
1004 /* Define PATH_MAX in case we don't use glibc or standard library does
1005  * not have PATH_MAX defined. Assume max path length is 4K characters.
1006  */
1007 #ifndef PATH_MAX
1008 #define PATH_MAX        4096
1009 #endif
1010