mdadm.h

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
   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 __USE_LARGEFILE64
  31 #include        <unistd.h>
  32 #ifndef __dietlibc__
  33 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
  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__NONO
  48 int strncmp(const char *s1, const char *s2, size_t n) __THROW __pure__;
  49 char *strncpy(char *dest, const char *src, size_t n) __THROW;
  50 #include    <strings.h>
  51 #endif
  52
  53
  54 #include        <linux/kdev_t.h>
  55 /*#include      <linux/fs.h> */
  56 #include        <sys/mount.h>
  57 #include        <asm/types.h>
  58 #include        <sys/ioctl.h>
  59 #define MD_MAJOR 9
  60 #define MdpMinorShift 6
  61
  62 #ifndef BLKGETSIZE64
  63 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  64 #endif
  65
  66 #define DEFAULT_BITMAP_CHUNK 4096
  67 #define DEFAULT_BITMAP_DELAY 5
  68 #define DEFAULT_MAX_WRITE_BEHIND 256
  69
  70 #include        "md_u.h"
  71 #include        "md_p.h"
  72 #include        "bitmap.h"
  73
  74 #include <endian.h>
  75 /* #include "asm/byteorder.h" Redhat don't like this so... */
  76 #if __BYTE_ORDER == __LITTLE_ENDIAN
  77 #  include <linux/byteorder/little_endian.h>
  78 #elif __BYTE_ORDER == __BIG_ENDIAN
  79 #  include <linux/byteorder/big_endian.h>
  80 #elif __BYTE_ORDER == __PDP_ENDIAN
  81 #  include <linux/byteorder/pdp_endian.h>
  82 #else
  83 #  error "unknown endianness."
  84 #endif
  85
  86
  87
  88 /* general information that might be extracted from a superblock */
  89 struct mdinfo {
  90         mdu_array_info_t        array;
  91         mdu_disk_info_t         disk;
  92         __u64                   events;
  93         int                     uuid[4];
  94 };
  95
  96 #define Name "mdadm"
  97
  98 enum mode {
  99         ASSEMBLE=1,
 100         BUILD,
 101         CREATE,
 102         MANAGE,
 103         MISC,
 104         MONITOR,
 105         GROW,
 106 };
 107
 108 extern char short_options[];
 109 extern char short_bitmap_auto_options[];
 110 extern struct option long_options[];
 111 extern char Version[], Usage[], Help[], OptionHelp[],
 112         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 113         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 114
 115 /* structures read from config file */
 116 /* List of mddevice names and identifiers
 117  * Identifiers can be:
 118  *    uuid=128-hex-uuid
 119  *    super-minor=decimal-minor-number-from-superblock
 120  *    devices=comma,separated,list,of,device,names,with,wildcards
 121  *
 122  * If multiple fields are present, the intersection of all matching
 123  * devices is considered
 124  */
 125 #define UnSet (0xfffe)
 126 typedef struct mddev_ident_s {
 127         char    *devname;
 128
 129         int     uuid_set;
 130         int     uuid[4];
 131         char    name[33];
 132
 133         unsigned int super_minor;
 134
 135         char    *devices;       /* comma separated list of device
 136                                  * names with wild cards
 137                                  */
 138         int     level;
 139         unsigned int raid_disks;
 140         unsigned int spare_disks;
 141         struct supertype *st;
 142         int     autof;          /* 1 for normal, 2 for partitioned */
 143         char    *spare_group;
 144         int     bitmap_fd;
 145
 146         struct mddev_ident_s *next;
 147 } *mddev_ident_t;
 148
 149 /* List of device names - wildcards expanded */
 150 typedef struct mddev_dev_s {
 151         char *devname;
 152         char disposition;       /* 'a' for add, 'r' for remove, 'f' for fail.
 153                                  * Not set for names read from .config
 154                                  */
 155         char writemostly;
 156         char re_add;
 157         struct mddev_dev_s *next;
 158 } *mddev_dev_t;
 159
 160 typedef struct mapping {
 161         char *name;
 162         int num;
 163 } mapping_t;
 164
 165
 166 struct mdstat_ent {
 167         char            *dev;
 168         int             devnum;
 169         int             active;
 170         char            *level;
 171         char            *pattern; /* U or up, _ for down */
 172         int             percent; /* -1 if no resync */
 173         int             resync; /* 1 if resync, 0 if recovery */
 174         struct mdstat_ent *next;
 175 };
 176
 177 extern struct mdstat_ent *mdstat_read(int hold, int start);
 178 extern void free_mdstat(struct mdstat_ent *ms);
 179 extern void mdstat_wait(int seconds);
 180
 181 /* Data structure for holding info read from sysfs */
 182 struct sysdev {
 183         char    name[20];
 184         int     role;
 185         int     major, minor;
 186         unsigned long long offset, size;
 187         int     state;
 188         int     errors;
 189         struct sysdev *next;
 190 };
 191 struct sysarray {
 192         char    name[20];
 193         struct sysdev *devs;
 194         int     chunk;
 195         unsigned long long component_size;
 196         int     layout;
 197         int     level;
 198         int     spares;
 199 };
 200 /* various details can be requested */
 201 #define GET_LEVEL       1
 202 #define GET_LAYOUT      2
 203 #define GET_COMPONENT   4
 204 #define GET_CHUNK       8
 205
 206 #define GET_DEVS        1024 /* gets role, major, minor */
 207 #define GET_OFFSET      2048
 208 #define GET_SIZE        4096
 209 #define GET_STATE       8192
 210 #define GET_ERROR       16384
 211
 212 /* If fd >= 0, get the array it is open on,
 213  * else use devnum. >=0 -> major9. <0.....
 214  */
 215 extern struct sysarray *sysfs_read(int fd, int devnum, unsigned long options);
 216 extern int sysfs_set_str(struct sysarray *sra, struct sysdev *dev,
 217                          char *name, char *val);
 218 extern int sysfs_set_num(struct sysarray *sra, struct sysdev *dev,
 219                          char *name, unsigned long long val);
 220 extern int sysfs_get_ll(struct sysarray *sra, struct sysdev *dev,
 221                         char *name, unsigned long long *val);
 222
 223
 224 extern int save_stripes(int *source, unsigned long long *offsets,
 225                         int raid_disks, int chunk_size, int level, int layout,
 226                         int nwrites, int *dest,
 227                         unsigned long long start, unsigned long long length);
 228
 229 #ifndef Sendmail
 230 #define Sendmail "/usr/lib/sendmail -t"
 231 #endif
 232
 233 #define SYSLOG_FACILITY LOG_DAEMON
 234
 235 extern char *map_num(mapping_t *map, int num);
 236 extern int map_name(mapping_t *map, char *name);
 237 extern mapping_t r5layout[], pers[], modes[], faultylayout[];
 238
 239 extern char *map_dev(int major, int minor);
 240
 241
 242 extern struct superswitch {
 243         void (*examine_super)(void *sbv);
 244         void (*brief_examine_super)(void *sbv);
 245         void (*detail_super)(void *sbv);
 246         void (*brief_detail_super)(void *sbv);
 247         void (*uuid_from_super)(int uuid[4], void *sbv);
 248         void (*getinfo_super)(struct mdinfo *info, mddev_ident_t ident, void *sbv);
 249         int (*update_super)(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose);
 250         __u64 (*event_super)(void *sbv);
 251         int (*init_super)(struct supertype *st, void **sbp, mdu_array_info_t *info, unsigned long long size, char *name);
 252         void (*add_to_super)(void *sbv, mdu_disk_info_t *dinfo);
 253         int (*store_super)(struct supertype *st, int fd, void *sbv);
 254         int (*write_init_super)(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname);
 255         int (*compare_super)(void **firstp, void *secondv);
 256         int (*load_super)(struct supertype *st, int fd, void **sbp, char *devname);
 257         struct supertype * (*match_metadata_desc)(char *arg);
 258         __u64 (*avail_size)(struct supertype *st, __u64 size);
 259         int (*add_internal_bitmap)(struct supertype *st, void *sbv, int chunk, int delay, int write_behind,
 260                                    unsigned long long size, int may_change, int major);
 261         void (*locate_bitmap)(struct supertype *st, int fd, void *sbv);
 262         int (*write_bitmap)(struct supertype *st, int fd, void *sbv);
 263         int major;
 264         int swapuuid; /* true if uuid is bigending rather than hostendian */
 265 } super0, super1, *superlist[];
 266
 267 struct supertype {
 268         struct superswitch *ss;
 269         int minor_version;
 270         int max_devs;
 271 };
 272
 273 extern struct supertype *super_by_version(int vers, int minor);
 274 extern struct supertype *guess_super(int fd);
 275
 276 #if __GNUC__ < 3
 277 struct stat64;
 278 #endif
 279
 280 #ifdef UCLIBC
 281   struct FTW {};
 282 # define FTW_PHYS 1
 283 #else
 284 # define  __USE_XOPEN_EXTENDED
 285 # include <ftw.h>
 286 # ifdef __dietlibc__
 287 #  define FTW_PHYS 1
 288 # endif
 289 #endif
 290
 291 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 292
 293
 294 extern int Manage_ro(char *devname, int fd, int readonly);
 295 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
 296 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
 297 extern int Manage_reconfig(char *devname, int fd, int layout);
 298 extern int Manage_subdevs(char *devname, int fd,
 299                           mddev_dev_t devlist, int verbose);
 300 extern int Grow_Add_device(char *devname, int fd, char *newdev);
 301 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
 302 extern int Grow_reshape(char *devname, int fd, int quiet,
 303                         long long size,
 304                         int level, int layout, int chunksize, int raid_disks);
 305
 306
 307 extern int Assemble(struct supertype *st, char *mddev, int mdfd,
 308                     mddev_ident_t ident,
 309                     char *conffile,
 310                     mddev_dev_t devlist,
 311                     int readonly, int runstop,
 312                     char *update,
 313                     int verbose, int force);
 314
 315 extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
 316                  int raiddisks,
 317                  mddev_dev_t devlist, int assume_clean,
 318                  char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
 319
 320
 321 extern int Create(struct supertype *st, char *mddev, int mdfd,
 322                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
 323                   char *name,
 324                   int subdevs, mddev_dev_t devlist,
 325                   int runstop, int verbose, int force, int assume_clean,
 326                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
 327
 328 extern int Detail(char *dev, int brief, int test);
 329 extern int Query(char *dev);
 330 extern int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust,
 331                    struct supertype *forcest);
 332 extern int Monitor(mddev_dev_t devlist,
 333                    char *mailaddr, char *alert_cmd,
 334                    int period, int daemonise, int scan, int oneshot,
 335                    int dosyslog, char *config, int test, char *pidfile);
 336
 337 extern int Kill(char *dev, int force);
 338
 339 extern int CreateBitmap(char *filename, int force, char uuid[16],
 340                         unsigned long chunksize, unsigned long daemon_sleep,
 341                         unsigned long write_behind,
 342                         unsigned long long array_size,
 343                         int major);
 344 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
 345
 346 extern int md_get_version(int fd);
 347 extern int get_linux_version(void);
 348 extern int parse_uuid(char *str, int uuid[4]);
 349 extern int check_ext2(int fd, char *name);
 350 extern int check_reiser(int fd, char *name);
 351 extern int check_raid(int fd, char *name);
 352
 353 extern int get_mdp_major(void);
 354 extern int dev_open(char *dev, int flags);
 355 extern int is_standard(char *dev, int *nump);
 356
 357
 358 extern mddev_ident_t conf_get_ident(char *conffile, char *dev);
 359 extern mddev_dev_t conf_get_devs(char *conffile);
 360 extern char *conf_get_mailaddr(char *conffile);
 361 extern char *conf_get_program(char *conffile);
 362 extern char *conf_line(FILE *file);
 363 extern char *conf_word(FILE *file, int allow_key);
 364 extern void free_line(char *line);
 365 extern int match_oneof(char *devices, char *devname);
 366 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
 367 extern int same_uuid(int a[4], int b[4], int swapuuid);
 368 /* extern int compare_super(mdp_super_t *first, mdp_super_t *second);*/
 369 extern unsigned long calc_csum(void *super, int bytes);
 370 extern int enough(int level, int raid_disks, int layout,
 371                    char *avail, int avail_disks);
 372 extern int ask(char *mesg);
 373 extern unsigned long long get_component_size(int fd);
 374
 375
 376 extern char *human_size(long long bytes);
 377 char *human_size_brief(long long bytes);
 378
 379 extern void put_md_name(char *name);
 380 extern char *get_md_name(int dev);
 381
 382 extern char DefaultConfFile[];
 383
 384 extern int open_mddev(char *dev, int autof);
 385
 386
 387 #define LEVEL_MULTIPATH         (-4)
 388 #define LEVEL_LINEAR            (-1)
 389 #define LEVEL_FAULTY            (-5)
 390
 391
 392 /* faulty stuff */
 393
 394 #define WriteTransient  0
 395 #define ReadTransient   1
 396 #define WritePersistent 2
 397 #define ReadPersistent  3
 398 #define WriteAll        4 /* doesn't go to device */
 399 #define ReadFixable     5
 400 #define Modes   6
 401
 402 #define ClearErrors     31
 403 #define ClearFaults     30
 404
 405 #define AllPersist      100 /* internal use only */
 406 #define NoPersist       101
 407
 408 #define ModeMask        0x1f
 409 #define ModeShift       5
 410
 411
 412 #ifdef __TINYC__
 413 #undef minor
 414 #undef major
 415 #undef makedev
 416 #define minor(x) ((x)&0xff)
 417 #define major(x) (((x)>>8)&0xff)
 418 #define makedev(M,m) (((M)<<8) | (m))
 419 #endif
 420
 421 /* for raid5 */
 422 #define ALGORITHM_LEFT_ASYMMETRIC       0
 423 #define ALGORITHM_RIGHT_ASYMMETRIC      1
 424 #define ALGORITHM_LEFT_SYMMETRIC        2
 425 #define ALGORITHM_RIGHT_SYMMETRIC       3