mdadm.h

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@cse.unsw.edu.au>
  23  *    Paper: Neil Brown
  24  *           School of Computer Science and Engineering
  25  *           The University of New South Wales
  26  *           Sydney, 2052
  27  *           Australia
  28  */
  29
  30 #define _GNU_SOURCE
  31 #define _FILE_OFFSET_BITS 64
  32 #include        <unistd.h>
  33 #if !defined(__dietlibc__) && !defined(__KLIBC__)
  34 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
  35 #else
  36 # if defined(__NO_STAT64) || __WORDSIZE != 32
  37 # define lseek64 lseek
  38 # endif
  39 #endif
  40
  41 #include        <sys/types.h>
  42 #include        <sys/stat.h>
  43 #include        <stdlib.h>
  44 #include        <time.h>
  45 #include        <sys/time.h>
  46 #include        <getopt.h>
  47 #include        <fcntl.h>
  48 #include        <stdio.h>
  49 #include        <errno.h>
  50 #include        <string.h>
  51 #include        <syslog.h>
  52 #ifdef __dietlibc__
  53 #include        <strings.h>
  54 /* dietlibc has deprecated random and srandom!! */
  55 #define random rand
  56 #define srandom srand
  57 #endif
  58
  59
  60 #include        <linux/kdev_t.h>
  61 /*#include      <linux/fs.h> */
  62 #include        <sys/mount.h>
  63 #include        <asm/types.h>
  64 #include        <sys/ioctl.h>
  65 #define MD_MAJOR 9
  66 #define MdpMinorShift 6
  67
  68 #ifndef BLKGETSIZE64
  69 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  70 #endif
  71
  72 #define DEFAULT_BITMAP_CHUNK 4096
  73 #define DEFAULT_BITMAP_DELAY 5
  74 #define DEFAULT_MAX_WRITE_BEHIND 256
  75
  76 #include        "md_u.h"
  77 #include        "md_p.h"
  78 #include        "bitmap.h"
  79 #include        "msg.h"
  80
  81 #include <endian.h>
  82 /* Redhat don't like to #include <asm/byteorder.h>, and
  83  * some time include <linux/byteorder/xxx_endian.h> isn't enough,
  84  * and there is no standard conversion function so... */
  85 /* And dietlibc doesn't think byteswap is ok, so.. */
  86 /*  #include <byteswap.h> */
  87 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
  88                      ((x) & 0xff00U) >> 8)
  89 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
  90                      ((x) & 0xff000000U) >> 24 | \
  91                      ((x) & 0x0000ff00U) << 8  | \
  92                      ((x) & 0x00ff0000U) >> 8)
  93 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
  94                      ((x) & 0xff00000000000000ULL) >> 56 | \
  95                      ((x) & 0x000000000000ff00ULL) << 40 | \
  96                      ((x) & 0x00ff000000000000ULL) >> 40 | \
  97                      ((x) & 0x0000000000ff0000ULL) << 24 | \
  98                      ((x) & 0x0000ff0000000000ULL) >> 24 | \
  99                      ((x) & 0x00000000ff000000ULL) << 8 | \
 100                      ((x) & 0x000000ff00000000ULL) >> 8)
 101
 102 #if !defined(__KLIBC__)
 103 #if BYTE_ORDER == LITTLE_ENDIAN
 104 #define __cpu_to_le16(_x) (_x)
 105 #define __cpu_to_le32(_x) (_x)
 106 #define __cpu_to_le64(_x) (_x)
 107 #define __le16_to_cpu(_x) (_x)
 108 #define __le32_to_cpu(_x) (_x)
 109 #define __le64_to_cpu(_x) (_x)
 110
 111 #define __cpu_to_be16(_x) bswap_16(_x)
 112 #define __cpu_to_be32(_x) bswap_32(_x)
 113 #define __cpu_to_be64(_x) bswap_64(_x)
 114 #define __be16_to_cpu(_x) bswap_16(_x)
 115 #define __be32_to_cpu(_x) bswap_32(_x)
 116 #define __be64_to_cpu(_x) bswap_64(_x)
 117 #elif BYTE_ORDER == BIG_ENDIAN
 118 #define __cpu_to_le16(_x) bswap_16(_x)
 119 #define __cpu_to_le32(_x) bswap_32(_x)
 120 #define __cpu_to_le64(_x) bswap_64(_x)
 121 #define __le16_to_cpu(_x) bswap_16(_x)
 122 #define __le32_to_cpu(_x) bswap_32(_x)
 123 #define __le64_to_cpu(_x) bswap_64(_x)
 124
 125 #define __cpu_to_be16(_x) (_x)
 126 #define __cpu_to_be32(_x) (_x)
 127 #define __cpu_to_be64(_x) (_x)
 128 #define __be16_to_cpu(_x) (_x)
 129 #define __be32_to_cpu(_x) (_x)
 130 #define __be64_to_cpu(_x) (_x)
 131 #else
 132 #  error "unknown endianness."
 133 #endif
 134 #endif /* __KLIBC__ */
 135
 136
 137
 138 /* general information that might be extracted from a superblock */
 139 struct mdinfo {
 140         mdu_array_info_t        array;
 141         mdu_disk_info_t         disk;
 142         __u64                   events;
 143         int                     uuid[4];
 144         char                    name[33];
 145         unsigned long long      data_offset;
 146         unsigned long long      component_size; /* same as array.size, except in
 147                                                  * sectors and up to 64bits.
 148                                                  */
 149         int                     reshape_active;
 150         unsigned long long      reshape_progress;
 151         unsigned long long      resync_start;
 152         int                     new_level, delta_disks, new_layout, new_chunk;
 153         int                     errors;
 154         int                     cache_size; /* size of raid456 stripe cache*/
 155         int                     mismatch_cnt;
 156         char                    text_version[50];
 157         int container_member; /* for assembling external-metatdata arrays */
 158
 159         char            sys_name[20];
 160         struct mdinfo *devs;
 161         struct mdinfo *next;
 162 };
 163
 164 struct createinfo {
 165         int     uid;
 166         int     gid;
 167         int     autof;
 168         int     mode;
 169         int     symlinks;
 170         struct supertype *supertype;
 171 };
 172
 173 #define Name "mdadm"
 174
 175 enum mode {
 176         ASSEMBLE=1,
 177         BUILD,
 178         CREATE,
 179         MANAGE,
 180         MISC,
 181         MONITOR,
 182         GROW,
 183         INCREMENTAL,
 184         AUTODETECT,
 185 };
 186
 187 extern char short_options[];
 188 extern char short_bitmap_options[];
 189 extern char short_bitmap_auto_options[];
 190 extern struct option long_options[];
 191 extern char Version[], Usage[], Help[], OptionHelp[],
 192         Help_create[], Help_build[], Help_assemble[], Help_grow[],
 193         Help_incr[],
 194         Help_manage[], Help_misc[], Help_monitor[], Help_config[];
 195
 196 /* for option that don't have short equivilents, we assign arbitrary
 197  * small numbers.  '1' means an undecorated option, so we start at '2'.
 198  */
 199 enum special_options {
 200         AssumeClean = 2,
 201         BitmapChunk,
 202         WriteBehind,
 203         ReAdd,
 204         NoDegraded,
 205         Sparc22,
 206         BackupFile,
 207         HomeHost,
 208         AutoHomeHost,
 209         Symlinks,
 210         AutoDetect,
 211 };
 212
 213 /* structures read from config file */
 214 /* List of mddevice names and identifiers
 215  * Identifiers can be:
 216  *    uuid=128-hex-uuid
 217  *    super-minor=decimal-minor-number-from-superblock
 218  *    devices=comma,separated,list,of,device,names,with,wildcards
 219  *
 220  * If multiple fields are present, the intersection of all matching
 221  * devices is considered
 222  */
 223 #define UnSet (0xfffe)
 224 typedef struct mddev_ident_s {
 225         char    *devname;
 226
 227         int     uuid_set;
 228         int     uuid[4];
 229         char    name[33];
 230
 231         unsigned int super_minor;
 232
 233         char    *devices;       /* comma separated list of device
 234                                  * names with wild cards
 235                                  */
 236         int     level;
 237         unsigned int raid_disks;
 238         unsigned int spare_disks;
 239         struct supertype *st;
 240         int     autof;          /* 1 for normal, 2 for partitioned */
 241         char    *spare_group;
 242         char    *bitmap_file;
 243         int     bitmap_fd;
 244
 245         struct mddev_ident_s *next;
 246 } *mddev_ident_t;
 247
 248 /* List of device names - wildcards expanded */
 249 typedef struct mddev_dev_s {
 250         char *devname;
 251         char disposition;       /* 'a' for add, 'r' for remove, 'f' for fail.
 252                                  * Not set for names read from .config
 253                                  */
 254         char writemostly;
 255         char re_add;
 256         char used;              /* set when used */
 257         struct mddev_dev_s *next;
 258 } *mddev_dev_t;
 259
 260 typedef struct mapping {
 261         char *name;
 262         int num;
 263 } mapping_t;
 264
 265
 266 struct mdstat_ent {
 267         char            *dev;
 268         int             devnum;
 269         int             active;
 270         char            *level;
 271         char            *pattern; /* U or up, _ for down */
 272         int             percent; /* -1 if no resync */
 273         int             resync; /* 1 if resync, 0 if recovery */
 274         struct mdstat_ent *next;
 275 };
 276
 277 extern struct mdstat_ent *mdstat_read(int hold, int start);
 278 extern void free_mdstat(struct mdstat_ent *ms);
 279 extern void mdstat_wait(int seconds);
 280 extern int mddev_busy(int devnum);
 281
 282 struct map_ent {
 283         struct map_ent *next;
 284         int     devnum;
 285         int     major,minor;
 286         int     uuid[4];
 287         char    *path;
 288 };
 289 extern int map_update(struct map_ent **mpp, int devnum, int major, int minor,
 290                       int uuid[4], char *path);
 291 extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
 292 extern void map_read(struct map_ent **melp);
 293 extern int map_write(struct map_ent *mel);
 294 extern void map_delete(struct map_ent **mapp, int devnum);
 295 extern void map_free(struct map_ent *map);
 296 extern void map_add(struct map_ent **melp,
 297                     int devnum, int major, int minor, int uuid[4], char *path);
 298
 299 /* various details can be requested */
 300 #define GET_LEVEL       1
 301 #define GET_LAYOUT      2
 302 #define GET_COMPONENT   4
 303 #define GET_CHUNK       8
 304 #define GET_CACHE       16
 305 #define GET_MISMATCH    32
 306 #define GET_VERSION     64
 307
 308 #define GET_DEVS        1024 /* gets role, major, minor */
 309 #define GET_OFFSET      2048
 310 #define GET_SIZE        4096
 311 #define GET_STATE       8192
 312 #define GET_ERROR       16384
 313
 314 /* If fd >= 0, get the array it is open on,
 315  * else use devnum. >=0 -> major9. <0.....
 316  */
 317 extern void sysfs_free(struct mdinfo *sra);
 318 extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
 319 extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 320                          char *name, char *val);
 321 extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 322                          char *name, unsigned long long val);
 323 extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 324                         char *name, unsigned long long *val);
 325 extern int sysfs_set_array(struct mdinfo *sra,
 326                            struct mdinfo *info);
 327 extern int sysfs_add_disk(struct mdinfo *sra, int fd, struct mdinfo *sd);
 328
 329
 330
 331
 332 extern int save_stripes(int *source, unsigned long long *offsets,
 333                         int raid_disks, int chunk_size, int level, int layout,
 334                         int nwrites, int *dest,
 335                         unsigned long long start, unsigned long long length);
 336 extern int restore_stripes(int *dest, unsigned long long *offsets,
 337                            int raid_disks, int chunk_size, int level, int layout,
 338                            int source, unsigned long long read_offset,
 339                            unsigned long long start, unsigned long long length);
 340
 341 #ifndef Sendmail
 342 #define Sendmail "/usr/lib/sendmail -t"
 343 #endif
 344
 345 #define SYSLOG_FACILITY LOG_DAEMON
 346
 347 extern char *map_num(mapping_t *map, int num);
 348 extern int map_name(mapping_t *map, char *name);
 349 extern mapping_t r5layout[], pers[], modes[], faultylayout[];
 350
 351 extern char *map_dev(int major, int minor, int create);
 352
 353
 354 extern struct superswitch {
 355         void (*examine_super)(struct supertype *st, char *homehost);
 356         void (*brief_examine_super)(struct supertype *st);
 357         void (*export_examine_super)(struct supertype *st);
 358         void (*detail_super)(struct supertype *st, char *homehost);
 359         void (*brief_detail_super)(struct supertype *st);
 360         void (*export_detail_super)(struct supertype *st);
 361         void (*uuid_from_super)(struct supertype *st, int uuid[4]);
 362         void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
 363         void (*getinfo_super_n)(struct supertype *st, struct mdinfo *info);
 364         int (*match_home)(struct supertype *st, char *homehost);
 365         int (*update_super)(struct supertype *st, struct mdinfo *info,
 366                             char *update,
 367                             char *devname, int verbose,
 368                             int uuid_set, char *homehost);
 369         int (*init_super)(struct supertype *st, mdu_array_info_t *info,
 370                           unsigned long long size, char *name,
 371                           char *homehost, int *uuid);
 372         void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
 373                              int fd, char *devname);
 374         int (*store_super)(struct supertype *st, int fd);
 375         int (*write_init_super)(struct supertype *st);
 376         int (*compare_super)(struct supertype *st, struct supertype *tst);
 377         int (*load_super)(struct supertype *st, int fd, char *devname);
 378         struct supertype * (*match_metadata_desc)(char *arg);
 379         __u64 (*avail_size)(struct supertype *st, __u64 size);
 380         int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
 381                                    int delay, int write_behind,
 382                                    unsigned long long size, int may_change, int major);
 383         void (*locate_bitmap)(struct supertype *st, int fd);
 384         int (*write_bitmap)(struct supertype *st, int fd);
 385         void (*free_super)(struct supertype *st);
 386         int (*validate_geometry)(struct supertype *st, int level, int layout,
 387                                  int raiddisks,
 388                                  int chunk, unsigned long long size,
 389                                  char *subdev, unsigned long long *freesize);
 390
 391         struct mdinfo *(*container_content)(struct supertype *st);
 392
 393         int major;
 394         char *text_version;
 395         int swapuuid; /* true if uuid is bigending rather than hostendian */
 396         int external;
 397 } super0, super1, super_ddf, super_ddf_bvd, super_ddf_svd, *superlist[];
 398
 399 extern struct superswitch super_imsm, super_imsm_raid;
 400
 401 struct supertype {
 402         struct superswitch *ss;
 403         int minor_version;
 404         int max_devs;
 405         int container_dev;    /* devnum of container */
 406         int container_member; /* numerical position in container */
 407         void *sb;
 408         void *info;
 409 };
 410
 411 extern struct supertype supertype_container_member;
 412 extern struct supertype *super_by_fd(int fd);
 413 extern struct supertype *guess_super(int fd);
 414 extern struct supertype *dup_super(struct supertype *st);
 415 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 416 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 417                          mdu_disk_info_t *disk);
 418
 419 #if __GNUC__ < 3
 420 struct stat64;
 421 #endif
 422
 423 #define HAVE_NFTW  we assume
 424 #define HAVE_FTW
 425
 426 #ifdef UCLIBC
 427 # include <features.h>
 428 # ifndef  __UCLIBC_HAS_FTW__
 429 #  undef HAVE_FTW
 430 #  undef HAVE_NFTW
 431 # endif
 432 #endif
 433
 434 #ifdef __dietlibc__
 435 # undef HAVE_NFTW
 436 #endif
 437
 438 #if defined(__KLIBC__)
 439 # undef HAVE_NFTW
 440 # undef HAVE_FTW
 441 #endif
 442
 443 #ifndef HAVE_NFTW
 444 # define FTW_PHYS 1
 445 # ifndef HAVE_FTW
 446   struct FTW {};
 447 # endif
 448 #endif
 449
 450 #ifdef HAVE_FTW
 451 # include <ftw.h>
 452 #endif
 453
 454 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 455
 456
 457 extern int Manage_ro(char *devname, int fd, int readonly);
 458 extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
 459 extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
 460 extern int Manage_reconfig(char *devname, int fd, int layout);
 461 extern int Manage_subdevs(char *devname, int fd,
 462                           mddev_dev_t devlist, int verbose);
 463 extern int autodetect(void);
 464 extern int Grow_Add_device(char *devname, int fd, char *newdev);
 465 extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
 466 extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
 467                         long long size,
 468                         int level, int layout, int chunksize, int raid_disks);
 469 extern int Grow_restart(struct supertype *st, struct mdinfo *info,
 470                         int *fdlist, int cnt, char *backup_file);
 471
 472
 473 extern int Assemble(struct supertype *st, char *mddev, int mdfd,
 474                     mddev_ident_t ident,
 475                     mddev_dev_t devlist, char *backup_file,
 476                     int readonly, int runstop,
 477                     char *update, char *homehost,
 478                     int verbose, int force);
 479
 480 extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
 481                  int raiddisks,
 482                  mddev_dev_t devlist, int assume_clean,
 483                  char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
 484
 485
 486 extern int Create(struct supertype *st, char *mddev, int mdfd,
 487                   int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
 488                   char *name, char *homehost, int *uuid,
 489                   int subdevs, mddev_dev_t devlist,
 490                   int runstop, int verbose, int force, int assume_clean,
 491                   char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
 492
 493 extern int Detail(char *dev, int brief, int export, int test, char *homehost);
 494 extern int Query(char *dev);
 495 extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
 496                    int SparcAdjust, struct supertype *forcest, char *homehost);
 497 extern int Monitor(mddev_dev_t devlist,
 498                    char *mailaddr, char *alert_cmd,
 499                    int period, int daemonise, int scan, int oneshot,
 500                    int dosyslog, int test, char *pidfile);
 501
 502 extern int Kill(char *dev, int force, int quiet, int noexcl);
 503 extern int Wait(char *dev);
 504
 505 extern int Incremental(char *devname, int verbose, int runstop,
 506                        struct supertype *st, char *homehost, int autof);
 507 extern int Incremental_container(struct supertype *st, char *devname,
 508                                  int verbose, int runstop, int autof);
 509 extern void RebuildMap(void);
 510 extern int IncrementalScan(int verbose);
 511
 512 extern int CreateBitmap(char *filename, int force, char uuid[16],
 513                         unsigned long chunksize, unsigned long daemon_sleep,
 514                         unsigned long write_behind,
 515                         unsigned long long array_size,
 516                         int major);
 517 extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
 518 extern int bitmap_update_uuid(int fd, int *uuid, int swap);
 519
 520 extern int md_get_version(int fd);
 521 extern int get_linux_version(void);
 522 extern int parse_uuid(char *str, int uuid[4]);
 523 extern int check_ext2(int fd, char *name);
 524 extern int check_reiser(int fd, char *name);
 525 extern int check_raid(int fd, char *name);
 526
 527 extern int get_mdp_major(void);
 528 extern int dev_open(char *dev, int flags);
 529 extern int is_standard(char *dev, int *nump);
 530
 531 extern int parse_auto(char *str, char *msg, int config);
 532 extern mddev_ident_t conf_get_ident(char *dev);
 533 extern mddev_dev_t conf_get_devs(void);
 534 extern int conf_test_dev(char *devname);
 535 extern struct createinfo *conf_get_create_info(void);
 536 extern void set_conffile(char *file);
 537 extern char *conf_get_mailaddr(void);
 538 extern char *conf_get_mailfrom(void);
 539 extern char *conf_get_program(void);
 540 extern char *conf_get_homehost(void);
 541 extern char *conf_line(FILE *file);
 542 extern char *conf_word(FILE *file, int allow_key);
 543 extern void free_line(char *line);
 544 extern int match_oneof(char *devices, char *devname);
 545 extern void uuid_from_super(int uuid[4], mdp_super_t *super);
 546 extern int same_uuid(int a[4], int b[4], int swapuuid);
 547 extern void copy_uuid(void *a, int b[4], int swapuuid);
 548 extern unsigned long calc_csum(void *super, int bytes);
 549 extern int enough(int level, int raid_disks, int layout, int clean,
 550                    char *avail, int avail_disks);
 551 extern int ask(char *mesg);
 552 extern unsigned long long get_component_size(int fd);
 553 extern void remove_partitions(int fd);
 554 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
 555                                    int chunksize, unsigned long long devsize);
 556
 557
 558 extern char *human_size(long long bytes);
 559 char *human_size_brief(long long bytes);
 560
 561 #define NoMdDev (1<<23)
 562 extern int find_free_devnum(int use_partitions);
 563
 564 extern void put_md_name(char *name);
 565 extern char *get_md_name(int dev);
 566
 567 extern char DefaultConfFile[];
 568
 569 extern int open_mddev(char *dev, int autof);
 570 extern int open_mddev_devnum(char *devname, int devnum, char *name,
 571                              char *chosen_name, int parts);
 572 extern int open_container(int fd);
 573
 574 extern char *devnum2devname(int num);
 575 extern int fd2devnum(int fd);
 576
 577 #define LEVEL_MULTIPATH         (-4)
 578 #define LEVEL_LINEAR            (-1)
 579 #define LEVEL_FAULTY            (-5)
 580
 581 /* kernel module doesn't know about these */
 582 #define LEVEL_CONTAINER         (-100)
 583 #define LEVEL_UNSUPPORTED       (-200)
 584
 585
 586 /* faulty stuff */
 587
 588 #define WriteTransient  0
 589 #define ReadTransient   1
 590 #define WritePersistent 2
 591 #define ReadPersistent  3
 592 #define WriteAll        4 /* doesn't go to device */
 593 #define ReadFixable     5
 594 #define Modes   6
 595
 596 #define ClearErrors     31
 597 #define ClearFaults     30
 598
 599 #define AllPersist      100 /* internal use only */
 600 #define NoPersist       101
 601
 602 #define ModeMask        0x1f
 603 #define ModeShift       5
 604
 605
 606 #ifdef __TINYC__
 607 #undef minor
 608 #undef major
 609 #undef makedev
 610 #define minor(x) ((x)&0xff)
 611 #define major(x) (((x)>>8)&0xff)
 612 #define makedev(M,m) (((M)<<8) | (m))
 613 #endif
 614
 615 /* for raid5 */
 616 #define ALGORITHM_LEFT_ASYMMETRIC       0
 617 #define ALGORITHM_RIGHT_ASYMMETRIC      1
 618 #define ALGORITHM_LEFT_SYMMETRIC        2
 619 #define ALGORITHM_RIGHT_SYMMETRIC       3