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