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
  80 #include <endian.h>
  81 /* Redhat don't like to #include <asm/byteorder.h>, and
  82  * some time include <linux/byteorder/xxx_endian.h> isn't enough,
  83  * and there is no standard conversion function so... */
  84 /* And dietlibc doesn't think byteswap is ok, so.. */
  85 /*  #include <byteswap.h> */
  86 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
  87                      ((x) & 0xff00U) >> 8)
  88 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
  89                      ((x) & 0xff000000U) >> 24 | \
  90                      ((x) & 0x0000ff00U) << 8  | \
  91                      ((x) & 0x00ff0000U) >> 8)
  92 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
  93                      ((x) & 0xff00000000000000ULL) >> 56 | \
  94                      ((x) & 0x000000000000ff00ULL) << 40 | \
  95                      ((x) & 0x00ff000000000000ULL) >> 40 | \
  96                      ((x) & 0x0000000000ff0000ULL) << 24 | \
  97                      ((x) & 0x0000ff0000000000ULL) >> 24 | \
  98                      ((x) & 0x00000000ff000000ULL) << 8 | \
  99                      ((x) & 0x000000ff00000000ULL) >> 8)
 100
 101 #if !defined(__KLIBC__)
 102 #if BYTE_ORDER == LITTLE_ENDIAN
 103 #define __cpu_to_le16(_x) (_x)
 104 #define __cpu_to_le32(_x) (_x)
 105 #define __cpu_to_le64(_x) (_x)
 106 #define __le16_to_cpu(_x) (_x)
 107 #define __le32_to_cpu(_x) (_x)
 108 #define __le64_to_cpu(_x) (_x)
 109
 110 #define __cpu_to_be16(_x) bswap_16(_x)
 111 #define __cpu_to_be32(_x) bswap_32(_x)
 112 #define __cpu_to_be64(_x) bswap_64(_x)
 113 #define __be16_to_cpu(_x) bswap_16(_x)
 114 #define __be32_to_cpu(_x) bswap_32(_x)
 115 #define __be64_to_cpu(_x) bswap_64(_x)
 116 #elif BYTE_ORDER == BIG_ENDIAN
 117 #define __cpu_to_le16(_x) bswap_16(_x)
 118 #define __cpu_to_le32(_x) bswap_32(_x)
 119 #define __cpu_to_le64(_x) bswap_64(_x)
 120 #define __le16_to_cpu(_x) bswap_16(_x)
 121 #define __le32_to_cpu(_x) bswap_32(_x)
 122 #define __le64_to_cpu(_x) bswap_64(_x)
 123
 124 #define __cpu_to_be16(_x) (_x)
 125 #define __cpu_to_be32(_x) (_x)
 126 #define __cpu_to_be64(_x) (_x)
 127 #define __be16_to_cpu(_x) (_x)
 128 #define __be32_to_cpu(_x) (_x)
 129 #define __be64_to_cpu(_x) (_x)
 130 #else
 131 #  error "unknown endianness."
 132 #endif
 133 #endif /* __KLIBC__ */
 134
 135
 136
 137 /* general information that might be extracted from a superblock */
 138 struct mdinfo {
 139         mdu_array_info_t        array;
 140         mdu_disk_info_t         disk;
 141         __u64                   events;
 142         int                     uuid[4];
 143         char                    name[33];
 144         unsigned long long      data_offset;
 145         unsigned long long      component_size; /* same as array.size, except in
 146                                                  * sectors and up to 64bits.
 147                                                  */
 148         int                     reshape_active;
 149         unsigned long long      reshape_progress;
 150         int                     new_level, delta_disks, new_layout, new_chunk;
 151         int                     errors;
 152         int                     cache_size; /* size of raid456 stripe cache*/
 153         int                     mismatch_cnt;
 154         char                    text_version[50];
 155         int container_member; /* for assembling external-metatdata arrays */
 156
 157         char            sys_name[20];
 158         struct mdinfo *devs;
 159         struct mdinfo *next;
 160 };
 161
 162 struct createinfo {
 163         int     uid;
 164         int     gid;
 165         int     autof;
 166         int     mode;
 167         int     symlinks;
 168         struct supertype *supertype;
 169 };
 170
 171 #define Name "mdadm"
 172
 173 enum mode {
 174         ASSEMBLE=1,
 175         BUILD,
 176         CREATE,
 177         MANAGE,
 178         MISC,
 179         MONITOR,
 180         GROW,
 181         INCREMENTAL,
 182         AUTODETECT,
 183 };
 184
 185 extern char short_options[];
 186 extern char short_bitmap_options[];
 187 extern char short_bitmap_auto_options[];
 188 extern struct option long_options[];
 189 extern char Version[], Usage[], Help[], OptionHelp[],
 190         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 191         Help_incr[],
 192         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 193
 194 /* for option that don't have short equivilents, we assign arbitrary
 195  * small numbers.  '1' means an undecorated option, so we start at '2'.
 196  */
 197 enum special_options {
 198         AssumeClean = 2,
 199         BitmapChunk,
 200         WriteBehind,
 201         ReAdd,
 202         NoDegraded,
 203         Sparc22,
 204         BackupFile,
 205         HomeHost,
 206         AutoHomeHost,
 207         Symlinks,
 208         AutoDetect,
 209 };
 210
 211 /* structures read from config file */
 212 /* List of mddevice names and identifiers
 213  * Identifiers can be:
 214  *    uuid=128-hex-uuid
 215  *    super-minor=decimal-minor-number-from-superblock
 216  *    devices=comma,separated,list,of,device,names,with,wildcards
 217  *
 218  * If multiple fields are present, the intersection of all matching
 219  * devices is considered
 220  */
 221 #define UnSet (0xfffe)
 222 typedef struct mddev_ident_s {
 223         char    *devname;
 224
 225         int     uuid_set;
 226         int     uuid[4];
 227         char    name[33];
 228
 229         unsigned int super_minor;
 230
 231         char    *devices;       /* comma separated list of device
 232                                  * names with wild cards
 233                                  */
 234         int     level;
 235         unsigned int raid_disks;
 236         unsigned int spare_disks;
 237         struct supertype *st;
 238         int     autof;          /* 1 for normal, 2 for partitioned */
 239         char    *spare_group;
 240         char    *bitmap_file;
 241         int     bitmap_fd;
 242
 243         struct mddev_ident_s *next;
 244 } *mddev_ident_t;
 245
 246 /* List of device names - wildcards expanded */
 247 typedef struct mddev_dev_s {
 248         char *devname;
 249         char disposition;       /* 'a' for add, 'r' for remove, 'f' for fail.
 250                                  * Not set for names read from .config
 251                                  */
 252         char writemostly;
 253         char re_add;
 254         char used;              /* set when used */
 255         struct mddev_dev_s *next;
 256 } *mddev_dev_t;
 257
 258 typedef struct mapping {
 259         char *name;
 260         int num;
 261 } mapping_t;
 262
 263
 264 struct mdstat_ent {
 265         char            *dev;
 266         int             devnum;
 267         int             active;
 268         char            *level;
 269         char            *pattern; /* U or up, _ for down */
 270         int             percent; /* -1 if no resync */
 271         int             resync; /* 1 if resync, 0 if recovery */
 272         struct mdstat_ent *next;
 273 };
 274
 275 extern struct mdstat_ent *mdstat_read(int hold, int start);
 276 extern void free_mdstat(struct mdstat_ent *ms);
 277 extern void mdstat_wait(int seconds);
 278 extern int mddev_busy(int devnum);
 279
 280 struct map_ent {
 281         struct map_ent *next;
 282         int     devnum;
 283         int     major,minor;
 284         int     uuid[4];
 285         char    *path;
 286 };
 287 extern int map_update(struct map_ent **mpp, int devnum, int major, int minor,
 288                       int uuid[4], char *path);
 289 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
 290 extern void map_read(struct map_ent **melp);
 291 extern int map_write(struct map_ent *mel);
 292 extern void map_delete(struct map_ent **mapp, int devnum);
 293 extern void map_free(struct map_ent *map);
 294 extern void map_add(struct map_ent **melp,
 295                     int devnum, int major, int minor, int uuid[4], char *path);
 296
 297 /* various details can be requested */
 298 #define GET_LEVEL       1
 299 #define GET_LAYOUT      2
 300 #define GET_COMPONENT   4
 301 #define GET_CHUNK       8
 302 #define GET_CACHE       16
 303 #define GET_MISMATCH    32
 304 #define GET_VERSION     64
 305
 306 #define GET_DEVS        1024 /* gets role, major, minor */
 307 #define GET_OFFSET      2048
 308 #define GET_SIZE        4096
 309 #define GET_STATE       8192
 310 #define GET_ERROR       16384
 311
 312 /* If fd >= 0, get the array it is open on,
 313  * else use devnum. >=0 -> major9. <0.....
 314  */
 315 extern void sysfs_free(struct mdinfo *sra);
 316 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
 317 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 318                          char *name, char *val);
 319 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 320                          char *name, unsigned long long val);
 321 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 322                         char *name, unsigned long long *val);
 323 extern int sysfs_set_array(struct mdinfo *sra,
 324                            struct mdinfo *info);
 325 extern int sysfs_add_disk(struct mdinfo *sra, int fd, struct mdinfo *sd);
 326
 327
 328
 329
 330 extern int save_stripes(int *source, unsigned long long *offsets,
 331                         int raid_disks, int chunk_size, int level, int layout,
 332                         int nwrites, int *dest,
 333                         unsigned long long start, unsigned long long length);
 334 extern int restore_stripes(int *dest, unsigned long long *offsets,
 335                            int raid_disks, int chunk_size, int level, int layout,
 336                            int source, unsigned long long read_offset,
 337                            unsigned long long start, unsigned long long length);
 338
 339 #ifndef Sendmail
 340 #define Sendmail "/usr/lib/sendmail -t"
 341 #endif
 342
 343 #define SYSLOG_FACILITY LOG_DAEMON
 344
 345 extern char *map_num(mapping_t *map, int num);
 346 extern int map_name(mapping_t *map, char *name);
 347 extern mapping_t r5layout[], pers[], modes[], faultylayout[];
 348
 349 extern char *map_dev(int major, int minor, int create);
 350
 351
 352 extern struct superswitch {
 353         void (*examine_super)(struct supertype *st, char *homehost);
 354         void (*brief_examine_super)(struct supertype *st);
 355         void (*export_examine_super)(struct supertype *st);
 356         void (*detail_super)(struct supertype *st, char *homehost);
 357         void (*brief_detail_super)(struct supertype *st);
 358         void (*export_detail_super)(struct supertype *st);
 359         void (*uuid_from_super)(struct supertype *st, int uuid[4]);
 360         void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
 361         void (*getinfo_super_n)(struct supertype *st, struct mdinfo *info);
 362         int (*match_home)(struct supertype *st, char *homehost);
 363         int (*update_super)(struct supertype *st, struct mdinfo *info,
 364                             char *update,
 365                             char *devname, int verbose,
 366                             int uuid_set, char *homehost);
 367         int (*init_super)(struct supertype *st, mdu_array_info_t *info,
 368                           unsigned long long size, char *name,
 369                           char *homehost, int *uuid);
 370         void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
 371                              int fd, char *devname);
 372         int (*store_super)(struct supertype *st, int fd);
 373         int (*write_init_super)(struct supertype *st);
 374         int (*compare_super)(struct supertype *st, struct supertype *tst);
 375         int (*load_super)(struct supertype *st, int fd, char *devname);
 376         struct supertype * (*match_metadata_desc)(char *arg);
 377         __u64 (*avail_size)(struct supertype *st, __u64 size);
 378         int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
 379                                    int delay, int write_behind,
 380                                    unsigned long long size, int may_change, int major);
 381         void (*locate_bitmap)(struct supertype *st, int fd);
 382         int (*write_bitmap)(struct supertype *st, int fd);
 383         void (*free_super)(struct supertype *st);
 384         int (*validate_geometry)(struct supertype *st, int level, int layout,
 385                                  int raiddisks,
 386                                  int chunk, unsigned long long size,
 387                                  char *subdev, unsigned long long *freesize);
 388
 389         struct mdinfo *(*container_content)(struct supertype *st);
 390
 391         int major;
 392         char *text_version;
 393         int swapuuid; /* true if uuid is bigending rather than hostendian */
 394         int external;
 395 } super0, super1, super_ddf, super_ddf_bvd, super_ddf_svd, *superlist[];
 396
 397 extern struct superswitch super_imsm, super_imsm_raid;
 398
 399 struct supertype {
 400         struct superswitch *ss;
 401         int minor_version;
 402         int max_devs;
 403         int container_dev;    /* devnum of container */
 404         int container_member; /* numerical position in container */
 405         void *sb;
 406         void *info;
 407 };
 408
 409 extern struct supertype *super_by_fd(int fd);
 410 extern struct supertype *guess_super(int fd);
 411 extern struct supertype *dup_super(struct supertype *st);
 412 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 413 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 414                          mdu_disk_info_t *disk);
 415
 416 #if __GNUC__ < 3
 417 struct stat64;
 418 #endif
 419
 420 #define HAVE_NFTW  we assume
 421 #define HAVE_FTW
 422
 423 #ifdef UCLIBC
 424 # include <features.h>
 425 # ifndef  __UCLIBC_HAS_FTW__
 426 #  undef HAVE_FTW
 427 #  undef HAVE_NFTW
 428 # endif
 429 #endif
 430
 431 #ifdef __dietlibc__
 432 # undef HAVE_NFTW
 433 #endif
 434
 435 #if defined(__KLIBC__)
 436 # undef HAVE_NFTW
 437 # undef HAVE_FTW
 438 #endif
 439
 440 #ifndef HAVE_NFTW
 441 # define FTW_PHYS 1
 442 # ifndef HAVE_FTW
 443   struct FTW {};
 444 # endif
 445 #endif
 446
 447 #ifdef HAVE_FTW
 448 # include <ftw.h>
 449 #endif
 450
 451 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 452
 453
 454 extern int Manage_ro(char *devname, int fd, int readonly);
 455 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
 456 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
 457 extern int Manage_reconfig(char *devname, int fd, int layout);
 458 extern int Manage_subdevs(char *devname, int fd,
 459                           mddev_dev_t devlist, int verbose);
 460 extern int autodetect(void);
 461 extern int Grow_Add_device(char *devname, int fd, char *newdev);
 462 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
 463 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
 464                         long long size,
 465                         int level, int layout, int chunksize, int raid_disks);
 466 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
 467                         int *fdlist, int cnt, char *backup_file);
 468
 469
 470 extern int Assemble(struct supertype *st, char *mddev, int mdfd,
 471                     mddev_ident_t ident,
 472                     mddev_dev_t devlist, char *backup_file,
 473                     int readonly, int runstop,
 474                     char *update, char *homehost,
 475                     int verbose, int force);
 476
 477 extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
 478                  int raiddisks,
 479                  mddev_dev_t devlist, int assume_clean,
 480                  char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
 481
 482
 483 extern int Create(struct supertype *st, char *mddev, int mdfd,
 484                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
 485                   char *name, char *homehost, int *uuid,
 486                   int subdevs, mddev_dev_t devlist,
 487                   int runstop, int verbose, int force, int assume_clean,
 488                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
 489
 490 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
 491 extern int Query(char *dev);
 492 extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
 493                    int SparcAdjust, struct supertype *forcest, char *homehost);
 494 extern int Monitor(mddev_dev_t devlist,
 495                    char *mailaddr, char *alert_cmd,
 496                    int period, int daemonise, int scan, int oneshot,
 497                    int dosyslog, int test, char *pidfile);
 498
 499 extern int Kill(char *dev, int force, int quiet, int noexcl);
 500 extern int Wait(char *dev);
 501
 502 extern int Incremental(char *devname, int verbose, int runstop,
 503                        struct supertype *st, char *homehost, int autof);
 504 extern int Incremental_container(struct supertype *st, char *devname,
 505                                  int verbose, int runstop, int autof);
 506 extern void RebuildMap(void);
 507 extern int IncrementalScan(int verbose);
 508
 509 extern int CreateBitmap(char *filename, int force, char uuid[16],
 510                         unsigned long chunksize, unsigned long daemon_sleep,
 511                         unsigned long write_behind,
 512                         unsigned long long array_size,
 513                         int major);
 514 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
 515 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
 516
 517 extern int md_get_version(int fd);
 518 extern int get_linux_version(void);
 519 extern int parse_uuid(char *str, int uuid[4]);
 520 extern int check_ext2(int fd, char *name);
 521 extern int check_reiser(int fd, char *name);
 522 extern int check_raid(int fd, char *name);
 523
 524 extern int get_mdp_major(void);
 525 extern int dev_open(char *dev, int flags);
 526 extern int is_standard(char *dev, int *nump);
 527
 528 extern int parse_auto(char *str, char *msg, int config);
 529 extern mddev_ident_t conf_get_ident(char *dev);
 530 extern mddev_dev_t conf_get_devs(void);
 531 extern int conf_test_dev(char *devname);
 532 extern struct createinfo *conf_get_create_info(void);
 533 extern void set_conffile(char *file);
 534 extern char *conf_get_mailaddr(void);
 535 extern char *conf_get_mailfrom(void);
 536 extern char *conf_get_program(void);
 537 extern char *conf_get_homehost(void);
 538 extern char *conf_line(FILE *file);
 539 extern char *conf_word(FILE *file, int allow_key);
 540 extern void free_line(char *line);
 541 extern int match_oneof(char *devices, char *devname);
 542 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
 543 extern int same_uuid(int a[4], int b[4], int swapuuid);
 544 extern void copy_uuid(void *a, int b[4], int swapuuid);
 545 extern unsigned long calc_csum(void *super, int bytes);
 546 extern int enough(int level, int raid_disks, int layout, int clean,
 547                    char *avail, int avail_disks);
 548 extern int ask(char *mesg);
 549 extern unsigned long long get_component_size(int fd);
 550 extern void remove_partitions(int fd);
 551 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
 552                                    int chunksize, unsigned long long devsize);
 553
 554
 555 extern char *human_size(long long bytes);
 556 char *human_size_brief(long long bytes);
 557
 558 #define NoMdDev (1<<23)
 559 extern int find_free_devnum(int use_partitions);
 560
 561 extern void put_md_name(char *name);
 562 extern char *get_md_name(int dev);
 563
 564 extern char DefaultConfFile[];
 565
 566 extern int open_mddev(char *dev, int autof);
 567 extern int open_mddev_devnum(char *devname, int devnum, char *name,
 568                              char *chosen_name, int parts);
 569 extern int open_container(int fd);
 570
 571 extern char *devnum2devname(int num);
 572 extern int fd2devnum(int fd);
 573
 574 #define LEVEL_MULTIPATH         (-4)
 575 #define LEVEL_LINEAR            (-1)
 576 #define LEVEL_FAULTY            (-5)
 577
 578 /* kernel module doesn't know about these */
 579 #define LEVEL_CONTAINER         (-100)
 580 #define LEVEL_UNSUPPORTED       (-200)
 581
 582
 583 /* faulty stuff */
 584
 585 #define WriteTransient  0
 586 #define ReadTransient   1
 587 #define WritePersistent 2
 588 #define ReadPersistent  3
 589 #define WriteAll        4 /* doesn't go to device */
 590 #define ReadFixable     5
 591 #define Modes   6
 592
 593 #define ClearErrors     31
 594 #define ClearFaults     30
 595
 596 #define AllPersist      100 /* internal use only */
 597 #define NoPersist       101
 598
 599 #define ModeMask        0x1f
 600 #define ModeShift       5
 601
 602
 603 #ifdef __TINYC__
 604 #undef minor
 605 #undef major
 606 #undef makedev
 607 #define minor(x) ((x)&0xff)
 608 #define major(x) (((x)>>8)&0xff)
 609 #define makedev(M,m) (((M)<<8) | (m))
 610 #endif
 611
 612 /* for raid5 */
 613 #define ALGORITHM_LEFT_ASYMMETRIC       0
 614 #define ALGORITHM_RIGHT_ASYMMETRIC      1
 615 #define ALGORITHM_LEFT_SYMMETRIC        2
 616 #define ALGORITHM_RIGHT_SYMMETRIC       3