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1 | /* | |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au> | |
5 | * | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * Author: Neil Brown | |
22 | * Email: <neilb@cse.unsw.edu.au> | |
23 | * Paper: Neil Brown | |
24 | * School of Computer Science and Engineering | |
25 | * The University of New South Wales | |
26 | * Sydney, 2052 | |
27 | * Australia | |
28 | */ | |
29 | ||
30 | #define __USE_LARGEFILE64 | |
31 | #include <unistd.h> | |
32 | #ifndef __dietlibc__ | |
33 | extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence)); | |
34 | #endif | |
35 | ||
36 | #include <sys/types.h> | |
37 | #include <sys/stat.h> | |
38 | #include <stdlib.h> | |
39 | #include <time.h> | |
40 | #include <sys/time.h> | |
41 | #include <getopt.h> | |
42 | #include <fcntl.h> | |
43 | #include <stdio.h> | |
44 | #include <errno.h> | |
45 | #include <string.h> | |
46 | #include <syslog.h> | |
47 | #ifdef __dietlibc__NONO | |
48 | int strncmp(const char *s1, const char *s2, size_t n) __THROW __pure__; | |
49 | char *strncpy(char *dest, const char *src, size_t n) __THROW; | |
50 | #include <strings.h> | |
51 | #endif | |
52 | ||
53 | ||
54 | #include <linux/kdev_t.h> | |
55 | /*#include <linux/fs.h> */ | |
56 | #include <sys/mount.h> | |
57 | #include <asm/types.h> | |
58 | #include <sys/ioctl.h> | |
59 | #define MD_MAJOR 9 | |
60 | #define MdpMinorShift 6 | |
61 | ||
62 | #ifndef BLKGETSIZE64 | |
63 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ | |
64 | #endif | |
65 | ||
66 | #define DEFAULT_BITMAP_CHUNK 4096 | |
67 | #define DEFAULT_BITMAP_DELAY 5 | |
68 | #define DEFAULT_MAX_WRITE_BEHIND 256 | |
69 | ||
70 | #include "md_u.h" | |
71 | #include "md_p.h" | |
72 | #include "bitmap.h" | |
73 | ||
74 | #include <endian.h> | |
75 | /* #include "asm/byteorder.h" Redhat don't like this so... */ | |
76 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
77 | # include <linux/byteorder/little_endian.h> | |
78 | #elif __BYTE_ORDER == __BIG_ENDIAN | |
79 | # include <linux/byteorder/big_endian.h> | |
80 | #elif __BYTE_ORDER == __PDP_ENDIAN | |
81 | # include <linux/byteorder/pdp_endian.h> | |
82 | #else | |
83 | # error "unknown endianness." | |
84 | #endif | |
85 | ||
86 | ||
87 | ||
88 | /* general information that might be extracted from a superblock */ | |
89 | struct mdinfo { | |
90 | mdu_array_info_t array; | |
91 | mdu_disk_info_t disk; | |
92 | __u64 events; | |
93 | int uuid[4]; | |
94 | char name[33]; | |
95 | unsigned long long data_offset; | |
96 | unsigned long long component_size; | |
97 | int reshape_active; | |
98 | unsigned long long reshape_progress; | |
99 | int new_level, delta_disks, new_layout, new_chunk; | |
100 | }; | |
101 | ||
102 | #define Name "mdadm" | |
103 | ||
104 | enum mode { | |
105 | ASSEMBLE=1, | |
106 | BUILD, | |
107 | CREATE, | |
108 | MANAGE, | |
109 | MISC, | |
110 | MONITOR, | |
111 | GROW, | |
112 | }; | |
113 | ||
114 | extern char short_options[]; | |
115 | extern char short_bitmap_auto_options[]; | |
116 | extern struct option long_options[]; | |
117 | extern char Version[], Usage[], Help[], OptionHelp[], | |
118 | Help_create[], Help_build[], Help_assemble[], Help_grow[], | |
119 | Help_manage[], Help_misc[], Help_monitor[], Help_config[]; | |
120 | ||
121 | /* structures read from config file */ | |
122 | /* List of mddevice names and identifiers | |
123 | * Identifiers can be: | |
124 | * uuid=128-hex-uuid | |
125 | * super-minor=decimal-minor-number-from-superblock | |
126 | * devices=comma,separated,list,of,device,names,with,wildcards | |
127 | * | |
128 | * If multiple fields are present, the intersection of all matching | |
129 | * devices is considered | |
130 | */ | |
131 | #define UnSet (0xfffe) | |
132 | typedef struct mddev_ident_s { | |
133 | char *devname; | |
134 | ||
135 | int uuid_set; | |
136 | int uuid[4]; | |
137 | char name[33]; | |
138 | ||
139 | unsigned int super_minor; | |
140 | ||
141 | char *devices; /* comma separated list of device | |
142 | * names with wild cards | |
143 | */ | |
144 | int level; | |
145 | unsigned int raid_disks; | |
146 | unsigned int spare_disks; | |
147 | struct supertype *st; | |
148 | int autof; /* 1 for normal, 2 for partitioned */ | |
149 | char *spare_group; | |
150 | int bitmap_fd; | |
151 | ||
152 | struct mddev_ident_s *next; | |
153 | } *mddev_ident_t; | |
154 | ||
155 | /* List of device names - wildcards expanded */ | |
156 | typedef struct mddev_dev_s { | |
157 | char *devname; | |
158 | char disposition; /* 'a' for add, 'r' for remove, 'f' for fail. | |
159 | * Not set for names read from .config | |
160 | */ | |
161 | char writemostly; | |
162 | char re_add; | |
163 | struct mddev_dev_s *next; | |
164 | } *mddev_dev_t; | |
165 | ||
166 | typedef struct mapping { | |
167 | char *name; | |
168 | int num; | |
169 | } mapping_t; | |
170 | ||
171 | ||
172 | struct mdstat_ent { | |
173 | char *dev; | |
174 | int devnum; | |
175 | int active; | |
176 | char *level; | |
177 | char *pattern; /* U or up, _ for down */ | |
178 | int percent; /* -1 if no resync */ | |
179 | int resync; /* 1 if resync, 0 if recovery */ | |
180 | struct mdstat_ent *next; | |
181 | }; | |
182 | ||
183 | extern struct mdstat_ent *mdstat_read(int hold, int start); | |
184 | extern void free_mdstat(struct mdstat_ent *ms); | |
185 | extern void mdstat_wait(int seconds); | |
186 | ||
187 | /* Data structure for holding info read from sysfs */ | |
188 | struct sysdev { | |
189 | char name[20]; | |
190 | int role; | |
191 | int major, minor; | |
192 | unsigned long long offset, size; | |
193 | int state; | |
194 | int errors; | |
195 | struct sysdev *next; | |
196 | }; | |
197 | struct sysarray { | |
198 | char name[20]; | |
199 | struct sysdev *devs; | |
200 | int chunk; | |
201 | unsigned long long component_size; | |
202 | int layout; | |
203 | int level; | |
204 | int spares; | |
205 | }; | |
206 | /* various details can be requested */ | |
207 | #define GET_LEVEL 1 | |
208 | #define GET_LAYOUT 2 | |
209 | #define GET_COMPONENT 4 | |
210 | #define GET_CHUNK 8 | |
211 | ||
212 | #define GET_DEVS 1024 /* gets role, major, minor */ | |
213 | #define GET_OFFSET 2048 | |
214 | #define GET_SIZE 4096 | |
215 | #define GET_STATE 8192 | |
216 | #define GET_ERROR 16384 | |
217 | ||
218 | /* If fd >= 0, get the array it is open on, | |
219 | * else use devnum. >=0 -> major9. <0..... | |
220 | */ | |
221 | extern struct sysarray *sysfs_read(int fd, int devnum, unsigned long options); | |
222 | extern int sysfs_set_str(struct sysarray *sra, struct sysdev *dev, | |
223 | char *name, char *val); | |
224 | extern int sysfs_set_num(struct sysarray *sra, struct sysdev *dev, | |
225 | char *name, unsigned long long val); | |
226 | extern int sysfs_get_ll(struct sysarray *sra, struct sysdev *dev, | |
227 | char *name, unsigned long long *val); | |
228 | ||
229 | ||
230 | extern int save_stripes(int *source, unsigned long long *offsets, | |
231 | int raid_disks, int chunk_size, int level, int layout, | |
232 | int nwrites, int *dest, | |
233 | unsigned long long start, unsigned long long length); | |
234 | extern int restore_stripes(int *dest, unsigned long long *offsets, | |
235 | int raid_disks, int chunk_size, int level, int layout, | |
236 | int source, unsigned long long read_offset, | |
237 | unsigned long long start, unsigned long long length); | |
238 | ||
239 | #ifndef Sendmail | |
240 | #define Sendmail "/usr/lib/sendmail -t" | |
241 | #endif | |
242 | ||
243 | #define SYSLOG_FACILITY LOG_DAEMON | |
244 | ||
245 | extern char *map_num(mapping_t *map, int num); | |
246 | extern int map_name(mapping_t *map, char *name); | |
247 | extern mapping_t r5layout[], pers[], modes[], faultylayout[]; | |
248 | ||
249 | extern char *map_dev(int major, int minor); | |
250 | ||
251 | ||
252 | extern struct superswitch { | |
253 | void (*examine_super)(void *sbv); | |
254 | void (*brief_examine_super)(void *sbv); | |
255 | void (*detail_super)(void *sbv); | |
256 | void (*brief_detail_super)(void *sbv); | |
257 | void (*uuid_from_super)(int uuid[4], void *sbv); | |
258 | void (*getinfo_super)(struct mdinfo *info, void *sbv); | |
259 | int (*update_super)(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose); | |
260 | __u64 (*event_super)(void *sbv); | |
261 | int (*init_super)(struct supertype *st, void **sbp, mdu_array_info_t *info, unsigned long long size, char *name); | |
262 | void (*add_to_super)(void *sbv, mdu_disk_info_t *dinfo); | |
263 | int (*store_super)(struct supertype *st, int fd, void *sbv); | |
264 | int (*write_init_super)(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname); | |
265 | int (*compare_super)(void **firstp, void *secondv); | |
266 | int (*load_super)(struct supertype *st, int fd, void **sbp, char *devname); | |
267 | struct supertype * (*match_metadata_desc)(char *arg); | |
268 | __u64 (*avail_size)(struct supertype *st, __u64 size); | |
269 | int (*add_internal_bitmap)(struct supertype *st, void *sbv, int chunk, int delay, int write_behind, | |
270 | unsigned long long size, int may_change, int major); | |
271 | void (*locate_bitmap)(struct supertype *st, int fd, void *sbv); | |
272 | int (*write_bitmap)(struct supertype *st, int fd, void *sbv); | |
273 | int major; | |
274 | int swapuuid; /* true if uuid is bigending rather than hostendian */ | |
275 | } super0, super1, *superlist[]; | |
276 | ||
277 | struct supertype { | |
278 | struct superswitch *ss; | |
279 | int minor_version; | |
280 | int max_devs; | |
281 | }; | |
282 | ||
283 | extern struct supertype *super_by_version(int vers, int minor); | |
284 | extern struct supertype *guess_super(int fd); | |
285 | ||
286 | #if __GNUC__ < 3 | |
287 | struct stat64; | |
288 | #endif | |
289 | ||
290 | #ifdef UCLIBC | |
291 | struct FTW {}; | |
292 | # define FTW_PHYS 1 | |
293 | #else | |
294 | # define __USE_XOPEN_EXTENDED | |
295 | # include <ftw.h> | |
296 | # ifdef __dietlibc__ | |
297 | # define FTW_PHYS 1 | |
298 | # endif | |
299 | #endif | |
300 | ||
301 | extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s); | |
302 | ||
303 | ||
304 | extern int Manage_ro(char *devname, int fd, int readonly); | |
305 | extern int Manage_runstop(char *devname, int fd, int runstop, int quiet); | |
306 | extern int Manage_resize(char *devname, int fd, long long size, int raid_disks); | |
307 | extern int Manage_reconfig(char *devname, int fd, int layout); | |
308 | extern int Manage_subdevs(char *devname, int fd, | |
309 | mddev_dev_t devlist, int verbose); | |
310 | extern int Grow_Add_device(char *devname, int fd, char *newdev); | |
311 | extern int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force); | |
312 | extern int Grow_reshape(char *devname, int fd, int quiet, char *backup_file, | |
313 | long long size, | |
314 | int level, int layout, int chunksize, int raid_disks); | |
315 | extern int Grow_restart(struct supertype *st, struct mdinfo *info, | |
316 | int *fdlist, int cnt, char *backup_file); | |
317 | ||
318 | ||
319 | extern int Assemble(struct supertype *st, char *mddev, int mdfd, | |
320 | mddev_ident_t ident, | |
321 | char *conffile, | |
322 | mddev_dev_t devlist, char *backup_file, | |
323 | int readonly, int runstop, | |
324 | char *update, | |
325 | int verbose, int force); | |
326 | ||
327 | extern int Build(char *mddev, int mdfd, int chunk, int level, int layout, | |
328 | int raiddisks, | |
329 | mddev_dev_t devlist, int assume_clean, | |
330 | char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose); | |
331 | ||
332 | ||
333 | extern int Create(struct supertype *st, char *mddev, int mdfd, | |
334 | int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks, | |
335 | char *name, | |
336 | int subdevs, mddev_dev_t devlist, | |
337 | int runstop, int verbose, int force, int assume_clean, | |
338 | char *bitmap_file, int bitmap_chunk, int write_behind, int delay); | |
339 | ||
340 | extern int Detail(char *dev, int brief, int test); | |
341 | extern int Query(char *dev); | |
342 | extern int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust, | |
343 | struct supertype *forcest); | |
344 | extern int Monitor(mddev_dev_t devlist, | |
345 | char *mailaddr, char *alert_cmd, | |
346 | int period, int daemonise, int scan, int oneshot, | |
347 | int dosyslog, char *config, int test, char *pidfile); | |
348 | ||
349 | extern int Kill(char *dev, int force); | |
350 | ||
351 | extern int CreateBitmap(char *filename, int force, char uuid[16], | |
352 | unsigned long chunksize, unsigned long daemon_sleep, | |
353 | unsigned long write_behind, | |
354 | unsigned long long array_size, | |
355 | int major); | |
356 | extern int ExamineBitmap(char *filename, int brief, struct supertype *st); | |
357 | ||
358 | extern int md_get_version(int fd); | |
359 | extern int get_linux_version(void); | |
360 | extern int parse_uuid(char *str, int uuid[4]); | |
361 | extern int check_ext2(int fd, char *name); | |
362 | extern int check_reiser(int fd, char *name); | |
363 | extern int check_raid(int fd, char *name); | |
364 | ||
365 | extern int get_mdp_major(void); | |
366 | extern int dev_open(char *dev, int flags); | |
367 | extern int is_standard(char *dev, int *nump); | |
368 | ||
369 | ||
370 | extern mddev_ident_t conf_get_ident(char *conffile, char *dev); | |
371 | extern mddev_dev_t conf_get_devs(char *conffile); | |
372 | extern char *conf_get_mailaddr(char *conffile); | |
373 | extern char *conf_get_program(char *conffile); | |
374 | extern char *conf_line(FILE *file); | |
375 | extern char *conf_word(FILE *file, int allow_key); | |
376 | extern void free_line(char *line); | |
377 | extern int match_oneof(char *devices, char *devname); | |
378 | extern void uuid_from_super(int uuid[4], mdp_super_t *super); | |
379 | extern int same_uuid(int a[4], int b[4], int swapuuid); | |
380 | /* extern int compare_super(mdp_super_t *first, mdp_super_t *second);*/ | |
381 | extern unsigned long calc_csum(void *super, int bytes); | |
382 | extern int enough(int level, int raid_disks, int layout, | |
383 | char *avail, int avail_disks); | |
384 | extern int ask(char *mesg); | |
385 | extern unsigned long long get_component_size(int fd); | |
386 | ||
387 | ||
388 | extern char *human_size(long long bytes); | |
389 | char *human_size_brief(long long bytes); | |
390 | ||
391 | extern void put_md_name(char *name); | |
392 | extern char *get_md_name(int dev); | |
393 | ||
394 | extern char DefaultConfFile[]; | |
395 | ||
396 | extern int open_mddev(char *dev, int autof); | |
397 | ||
398 | ||
399 | #define LEVEL_MULTIPATH (-4) | |
400 | #define LEVEL_LINEAR (-1) | |
401 | #define LEVEL_FAULTY (-5) | |
402 | ||
403 | ||
404 | /* faulty stuff */ | |
405 | ||
406 | #define WriteTransient 0 | |
407 | #define ReadTransient 1 | |
408 | #define WritePersistent 2 | |
409 | #define ReadPersistent 3 | |
410 | #define WriteAll 4 /* doesn't go to device */ | |
411 | #define ReadFixable 5 | |
412 | #define Modes 6 | |
413 | ||
414 | #define ClearErrors 31 | |
415 | #define ClearFaults 30 | |
416 | ||
417 | #define AllPersist 100 /* internal use only */ | |
418 | #define NoPersist 101 | |
419 | ||
420 | #define ModeMask 0x1f | |
421 | #define ModeShift 5 | |
422 | ||
423 | ||
424 | #ifdef __TINYC__ | |
425 | #undef minor | |
426 | #undef major | |
427 | #undef makedev | |
428 | #define minor(x) ((x)&0xff) | |
429 | #define major(x) (((x)>>8)&0xff) | |
430 | #define makedev(M,m) (((M)<<8) | (m)) | |
431 | #endif | |
432 | ||
433 | /* for raid5 */ | |
434 | #define ALGORITHM_LEFT_ASYMMETRIC 0 | |
435 | #define ALGORITHM_RIGHT_ASYMMETRIC 1 | |
436 | #define ALGORITHM_LEFT_SYMMETRIC 2 | |
437 | #define ALGORITHM_RIGHT_SYMMETRIC 3 |