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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__)
34extern __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 */
139struct 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
158 int container_member; /* for assembling external-metatdata arrays
159 * This is to be used internally by metadata
160 * handler only */
161
162 char sys_name[20];
163 struct mdinfo *devs;
164 struct mdinfo *next;
165
166 /* Device info for mdmon: */
167 int state_fd;
168 #define DS_FAULTY 1
169 #define DS_INSYNC 2
170 #define DS_WRITE_MOSTLY 4
171 #define DS_SPARE 8
172 #define DS_BLOCKED 16
173 #define DS_REMOVE 1024
174 int prev_state, curr_state, next_state;
175
176};
177
178struct createinfo {
179 int uid;
180 int gid;
181 int autof;
182 int mode;
183 int symlinks;
184 struct supertype *supertype;
185};
186
187#define Name "mdadm"
188
189enum mode {
190 ASSEMBLE=1,
191 BUILD,
192 CREATE,
193 MANAGE,
194 MISC,
195 MONITOR,
196 GROW,
197 INCREMENTAL,
198 AUTODETECT,
199};
200
201extern char short_options[];
202extern char short_bitmap_options[];
203extern char short_bitmap_auto_options[];
204extern struct option long_options[];
205extern char Version[], Usage[], Help[], OptionHelp[],
206 Help_create[], Help_build[], Help_assemble[], Help_grow[],
207 Help_incr[],
208 Help_manage[], Help_misc[], Help_monitor[], Help_config[];
209
210/* for option that don't have short equivilents, we assign arbitrary
211 * small numbers. '1' means an undecorated option, so we start at '2'.
212 */
213enum special_options {
214 AssumeClean = 2,
215 BitmapChunk,
216 WriteBehind,
217 ReAdd,
218 NoDegraded,
219 Sparc22,
220 BackupFile,
221 HomeHost,
222 AutoHomeHost,
223 Symlinks,
224 AutoDetect,
225};
226
227/* structures read from config file */
228/* List of mddevice names and identifiers
229 * Identifiers can be:
230 * uuid=128-hex-uuid
231 * super-minor=decimal-minor-number-from-superblock
232 * devices=comma,separated,list,of,device,names,with,wildcards
233 *
234 * If multiple fields are present, the intersection of all matching
235 * devices is considered
236 */
237#define UnSet (0xfffe)
238typedef struct mddev_ident_s {
239 char *devname;
240
241 int uuid_set;
242 int uuid[4];
243 char name[33];
244
245 unsigned int super_minor;
246
247 char *devices; /* comma separated list of device
248 * names with wild cards
249 */
250 int level;
251 unsigned int raid_disks;
252 unsigned int spare_disks;
253 struct supertype *st;
254 int autof; /* 1 for normal, 2 for partitioned */
255 char *spare_group;
256 char *bitmap_file;
257 int bitmap_fd;
258
259 struct mddev_ident_s *next;
260} *mddev_ident_t;
261
262/* List of device names - wildcards expanded */
263typedef struct mddev_dev_s {
264 char *devname;
265 char disposition; /* 'a' for add, 'r' for remove, 'f' for fail.
266 * Not set for names read from .config
267 */
268 char writemostly;
269 char re_add;
270 char used; /* set when used */
271 struct mddev_dev_s *next;
272} *mddev_dev_t;
273
274typedef struct mapping {
275 char *name;
276 int num;
277} mapping_t;
278
279
280struct mdstat_ent {
281 char *dev;
282 int devnum;
283 int active;
284 char *level;
285 char *pattern; /* U or up, _ for down */
286 int percent; /* -1 if no resync */
287 int resync; /* 1 if resync, 0 if recovery */
288 int devcnt;
289 int raid_disks;
290 int chunk_size;
291 char * metadata_version;
292 struct mdstat_ent *next;
293};
294
295extern struct mdstat_ent *mdstat_read(int hold, int start);
296extern void free_mdstat(struct mdstat_ent *ms);
297extern void mdstat_wait(int seconds);
298extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
299extern int mddev_busy(int devnum);
300
301struct map_ent {
302 struct map_ent *next;
303 int devnum;
304 char metadata[20];
305 int uuid[4];
306 char *path;
307};
308extern int map_update(struct map_ent **mpp, int devnum, char *metadata,
309 int uuid[4], char *path);
310extern struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]);
311extern void map_read(struct map_ent **melp);
312extern int map_write(struct map_ent *mel);
313extern void map_delete(struct map_ent **mapp, int devnum);
314extern void map_free(struct map_ent *map);
315extern void map_add(struct map_ent **melp,
316 int devnum, char *metadata, int uuid[4], char *path);
317
318/* various details can be requested */
319#define GET_LEVEL 1
320#define GET_LAYOUT 2
321#define GET_COMPONENT 4
322#define GET_CHUNK 8
323#define GET_CACHE 16
324#define GET_MISMATCH 32
325#define GET_VERSION 64
326#define GET_DISKS 128
327
328#define GET_DEVS 1024 /* gets role, major, minor */
329#define GET_OFFSET 2048
330#define GET_SIZE 4096
331#define GET_STATE 8192
332#define GET_ERROR 16384
333
334/* If fd >= 0, get the array it is open on,
335 * else use devnum. >=0 -> major9. <0.....
336 */
337extern int sysfs_open(int devnum, char *devname, char *attr);
338extern void sysfs_free(struct mdinfo *sra);
339extern struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options);
340extern int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
341 char *name, char *val);
342extern int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
343 char *name, unsigned long long val);
344extern int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
345 char *name, unsigned long long *val);
346extern int sysfs_set_array(struct mdinfo *sra,
347 struct mdinfo *info);
348extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd);
349extern int sysfs_disk_to_sg(int fd);
350extern int sysfs_disk_to_scsi_id(int fd, __u32 *id);
351
352
353extern int save_stripes(int *source, unsigned long long *offsets,
354 int raid_disks, int chunk_size, int level, int layout,
355 int nwrites, int *dest,
356 unsigned long long start, unsigned long long length);
357extern int restore_stripes(int *dest, unsigned long long *offsets,
358 int raid_disks, int chunk_size, int level, int layout,
359 int source, unsigned long long read_offset,
360 unsigned long long start, unsigned long long length);
361
362#ifndef Sendmail
363#define Sendmail "/usr/lib/sendmail -t"
364#endif
365
366#define SYSLOG_FACILITY LOG_DAEMON
367
368extern char *map_num(mapping_t *map, int num);
369extern int map_name(mapping_t *map, char *name);
370extern mapping_t r5layout[], pers[], modes[], faultylayout[];
371
372extern char *map_dev(int major, int minor, int create);
373
374struct active_array;
375struct metadata_update;
376
377extern struct superswitch {
378 void (*examine_super)(struct supertype *st, char *homehost);
379 void (*brief_examine_super)(struct supertype *st);
380 void (*export_examine_super)(struct supertype *st);
381 void (*detail_super)(struct supertype *st, char *homehost);
382 void (*brief_detail_super)(struct supertype *st);
383 void (*export_detail_super)(struct supertype *st);
384 void (*uuid_from_super)(struct supertype *st, int uuid[4]);
385 void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
386 void (*getinfo_super_n)(struct supertype *st, struct mdinfo *info);
387 int (*match_home)(struct supertype *st, char *homehost);
388 int (*update_super)(struct supertype *st, struct mdinfo *info,
389 char *update,
390 char *devname, int verbose,
391 int uuid_set, char *homehost);
392 int (*init_super)(struct supertype *st, mdu_array_info_t *info,
393 unsigned long long size, char *name,
394 char *homehost, int *uuid);
395 void (*add_to_super)(struct supertype *st, mdu_disk_info_t *dinfo,
396 int fd, char *devname);
397 int (*store_super)(struct supertype *st, int fd);
398 int (*write_init_super)(struct supertype *st);
399 int (*compare_super)(struct supertype *st, struct supertype *tst);
400 int (*load_super)(struct supertype *st, int fd, char *devname);
401 struct supertype * (*match_metadata_desc)(char *arg);
402 __u64 (*avail_size)(struct supertype *st, __u64 size);
403 int (*add_internal_bitmap)(struct supertype *st, int *chunkp,
404 int delay, int write_behind,
405 unsigned long long size, int may_change, int major);
406 void (*locate_bitmap)(struct supertype *st, int fd);
407 int (*write_bitmap)(struct supertype *st, int fd);
408 void (*free_super)(struct supertype *st);
409 int (*validate_geometry)(struct supertype *st, int level, int layout,
410 int raiddisks,
411 int chunk, unsigned long long size,
412 char *subdev, unsigned long long *freesize);
413
414 struct mdinfo *(*container_content)(struct supertype *st);
415
416/* for mdmon */
417 int (*open_new)(struct supertype *c, struct active_array *a,
418 char *inst);
419
420 /* Tell the metadata handler the current state of the array.
421 * This covers whether it is known to be consistent (no pending writes)
422 * when how far along a resync is known to have progressed
423 * (in a->resync_start).
424 * resync status is really irrelevant if the array is not consistent,
425 * but some metadata (DDF!) have a place to record the distinction.
426 */
427 void (*set_array_state)(struct active_array *a, int consistent);
428
429 /* When the state of a device might have changed, we call set_disk to
430 * tell the metadata what the current state is.
431 * Typically this happens on spare->in_sync and (spare|in_sync)->faulty
432 * transitions.
433 * set_disk might be called when the state of the particular disk has
434 * not in fact changed.
435 */
436 void (*set_disk)(struct active_array *a, int n, int state);
437 void (*sync_metadata)(struct supertype *st);
438 void (*process_update)(struct supertype *st,
439 struct metadata_update *update);
440
441 /* activate_spare will check if the array is degraded and, if it
442 * is, try to find some spare space in the container.
443 * On success, it add appropriate updates (For process_update) to
444 * to the 'updates' list and returns a list of 'mdinfo' identifying
445 * the device, or devices as there might be multiple missing
446 * devices and multiple spares available.
447 */
448 struct mdinfo *(*activate_spare)(struct active_array *a,
449 struct metadata_update **updates);
450
451 int swapuuid; /* true if uuid is bigending rather than hostendian */
452 int external;
453} super0, super1, super_ddf, *superlist[];
454
455extern struct superswitch super_imsm;
456
457struct supertype {
458 struct superswitch *ss;
459 int minor_version;
460 int max_devs;
461 int container_dev; /* devnum of container */
462 void *sb;
463 void *info;
464
465 /* extra stuff used by mdmon */
466 struct active_array *arrays;
467 int sock; /* listen to external programs */
468 int mgr_pipe[2]; /* communicate between threads */
469 int mon_pipe[2]; /* communicate between threads */
470 int devnum;
471 char *devname; /* e.g. md0. This appears in metadata_verison:
472 * external:/md0/12
473 */
474 int devcnt;
475 char *device_name; /* e.g. /dev/md/whatever */
476
477 struct mdinfo *devs;
478
479};
480
481extern struct supertype supertype_container_member;
482extern struct supertype *super_by_fd(int fd);
483extern struct supertype *guess_super(int fd);
484extern struct supertype *dup_super(struct supertype *st);
485extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
486extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
487 mdu_disk_info_t *disk);
488
489#if __GNUC__ < 3
490struct stat64;
491#endif
492
493#define HAVE_NFTW we assume
494#define HAVE_FTW
495
496#ifdef UCLIBC
497# include <features.h>
498# ifndef __UCLIBC_HAS_FTW__
499# undef HAVE_FTW
500# undef HAVE_NFTW
501# endif
502#endif
503
504#ifdef __dietlibc__
505# undef HAVE_NFTW
506#endif
507
508#if defined(__KLIBC__)
509# undef HAVE_NFTW
510# undef HAVE_FTW
511#endif
512
513#ifndef HAVE_NFTW
514# define FTW_PHYS 1
515# ifndef HAVE_FTW
516 struct FTW {};
517# endif
518#endif
519
520#ifdef HAVE_FTW
521# include <ftw.h>
522#endif
523
524extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
525
526
527extern int Manage_ro(char *devname, int fd, int readonly);
528extern int Manage_runstop(char *devname, int fd, int runstop, int quiet);
529extern int Manage_resize(char *devname, int fd, long long size, int raid_disks);
530extern int Manage_reconfig(char *devname, int fd, int layout);
531extern int Manage_subdevs(char *devname, int fd,
532 mddev_dev_t devlist, int verbose);
533extern int autodetect(void);
534extern int Grow_Add_device(char *devname, int fd, char *newdev);
535extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force);
536extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
537 long long size,
538 int level, int layout, int chunksize, int raid_disks);
539extern int Grow_restart(struct supertype *st, struct mdinfo *info,
540 int *fdlist, int cnt, char *backup_file);
541
542
543extern int Assemble(struct supertype *st, char *mddev, int mdfd,
544 mddev_ident_t ident,
545 mddev_dev_t devlist, char *backup_file,
546 int readonly, int runstop,
547 char *update, char *homehost,
548 int verbose, int force);
549
550extern int Build(char *mddev, int mdfd, int chunk, int level, int layout,
551 int raiddisks,
552 mddev_dev_t devlist, int assume_clean,
553 char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose);
554
555
556extern int Create(struct supertype *st, char *mddev, int mdfd,
557 int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
558 char *name, char *homehost, int *uuid,
559 int subdevs, mddev_dev_t devlist,
560 int runstop, int verbose, int force, int assume_clean,
561 char *bitmap_file, int bitmap_chunk, int write_behind, int delay);
562
563extern int Detail(char *dev, int brief, int export, int test, char *homehost);
564extern int Query(char *dev);
565extern int Examine(mddev_dev_t devlist, int brief, int export, int scan,
566 int SparcAdjust, struct supertype *forcest, char *homehost);
567extern int Monitor(mddev_dev_t devlist,
568 char *mailaddr, char *alert_cmd,
569 int period, int daemonise, int scan, int oneshot,
570 int dosyslog, int test, char *pidfile);
571
572extern int Kill(char *dev, int force, int quiet, int noexcl);
573extern int Wait(char *dev);
574
575extern int Incremental(char *devname, int verbose, int runstop,
576 struct supertype *st, char *homehost, int autof);
577extern int Incremental_container(struct supertype *st, char *devname,
578 int verbose, int runstop, int autof);
579extern void RebuildMap(void);
580extern int IncrementalScan(int verbose);
581
582extern int CreateBitmap(char *filename, int force, char uuid[16],
583 unsigned long chunksize, unsigned long daemon_sleep,
584 unsigned long write_behind,
585 unsigned long long array_size,
586 int major);
587extern int ExamineBitmap(char *filename, int brief, struct supertype *st);
588extern int bitmap_update_uuid(int fd, int *uuid, int swap);
589
590extern int md_get_version(int fd);
591extern int get_linux_version(void);
592extern int parse_uuid(char *str, int uuid[4]);
593extern int check_ext2(int fd, char *name);
594extern int check_reiser(int fd, char *name);
595extern int check_raid(int fd, char *name);
596
597extern int get_mdp_major(void);
598extern int dev_open(char *dev, int flags);
599extern int open_dev_excl(int devnum);
600extern int is_standard(char *dev, int *nump);
601
602extern int parse_auto(char *str, char *msg, int config);
603extern mddev_ident_t conf_get_ident(char *dev);
604extern mddev_dev_t conf_get_devs(void);
605extern int conf_test_dev(char *devname);
606extern struct createinfo *conf_get_create_info(void);
607extern void set_conffile(char *file);
608extern char *conf_get_mailaddr(void);
609extern char *conf_get_mailfrom(void);
610extern char *conf_get_program(void);
611extern char *conf_get_homehost(void);
612extern char *conf_line(FILE *file);
613extern char *conf_word(FILE *file, int allow_key);
614extern void free_line(char *line);
615extern int match_oneof(char *devices, char *devname);
616extern void uuid_from_super(int uuid[4], mdp_super_t *super);
617extern int same_uuid(int a[4], int b[4], int swapuuid);
618extern void copy_uuid(void *a, int b[4], int swapuuid);
619extern unsigned long calc_csum(void *super, int bytes);
620extern int enough(int level, int raid_disks, int layout, int clean,
621 char *avail, int avail_disks);
622extern int ask(char *mesg);
623extern unsigned long long get_component_size(int fd);
624extern void remove_partitions(int fd);
625extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
626 int chunksize, unsigned long long devsize);
627
628
629extern char *human_size(long long bytes);
630char *human_size_brief(long long bytes);
631
632#define NoMdDev (1<<23)
633extern int find_free_devnum(int use_partitions);
634
635extern void put_md_name(char *name);
636extern char *get_md_name(int dev);
637
638extern char DefaultConfFile[];
639
640extern int open_mddev(char *dev, int autof);
641extern int open_mddev_devnum(char *devname, int devnum, char *name,
642 char *chosen_name, int parts);
643extern int open_container(int fd);
644
645extern int mdmon_running(int devnum);
646extern int signal_mdmon(int devnum);
647
648extern char *devnum2devname(int num);
649extern int fd2devnum(int fd);
650
651static inline int dev2major(int d)
652{
653 if (d >= 0)
654 return MD_MAJOR;
655 else
656 return get_mdp_major();
657}
658
659static inline int dev2minor(int d)
660{
661 if (d >= 0)
662 return d;
663 return (-1-d) << MdpMinorShift;
664}
665
666#define LEVEL_MULTIPATH (-4)
667#define LEVEL_LINEAR (-1)
668#define LEVEL_FAULTY (-5)
669
670/* kernel module doesn't know about these */
671#define LEVEL_CONTAINER (-100)
672#define LEVEL_UNSUPPORTED (-200)
673
674
675/* faulty stuff */
676
677#define WriteTransient 0
678#define ReadTransient 1
679#define WritePersistent 2
680#define ReadPersistent 3
681#define WriteAll 4 /* doesn't go to device */
682#define ReadFixable 5
683#define Modes 6
684
685#define ClearErrors 31
686#define ClearFaults 30
687
688#define AllPersist 100 /* internal use only */
689#define NoPersist 101
690
691#define ModeMask 0x1f
692#define ModeShift 5
693
694
695#ifdef __TINYC__
696#undef minor
697#undef major
698#undef makedev
699#define minor(x) ((x)&0xff)
700#define major(x) (((x)>>8)&0xff)
701#define makedev(M,m) (((M)<<8) | (m))
702#endif
703
704/* for raid5 */
705#define ALGORITHM_LEFT_ASYMMETRIC 0
706#define ALGORITHM_RIGHT_ASYMMETRIC 1
707#define ALGORITHM_LEFT_SYMMETRIC 2
708#define ALGORITHM_RIGHT_SYMMETRIC 3
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