mdadm-1.6.0
[thirdparty/mdadm.git] / config.c
CommitLineData
64c4757e 1/*
9a9dab36 2 * mdadm - manage Linux "md" devices aka RAID arrays.
64c4757e 3 *
cd29a5c8 4 * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
64c4757e
NB
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
9a9dab36 30#include "mdadm.h"
82b27616 31#include "dlink.h"
b83d95f3 32#include <sys/dir.h>
82b27616 33#include <glob.h>
52826846 34#include <fnmatch.h>
dd0781e5 35#include <ctype.h>
52826846 36
64c4757e
NB
37/*
38 * Read the config file
39 *
40 * conf_get_uuids gets a list of devicename+uuid pairs
41 * conf_get_devs gets device names after expanding wildcards
42 *
43 * Each keeps the returned list and frees it when asked to make
44 * a new list.
45 *
82b27616
NB
46 * The format of the config file needs to be fairly extensible.
47 * Now, arrays only have names and uuids and devices merely are.
48 * But later arrays might want names, and devices might want superblock
49 * versions, and who knows what else.
50 * I like free format, abhore backslash line continuation, adore
51 * indentation for structure and am ok about # comments.
52 *
53 * So, each line that isn't blank or a #comment must either start
54 * with a key word, and not be indented, or must start with a
55 * non-key-word and must be indented.
56 *
57 * Keywords are DEVICE and ARRAY
58 * DEV{ICE} introduces some devices that might contain raid components.
59 * e.g.
60 * DEV style=0 /dev/sda* /dev/hd*
61 * DEV style=1 /dev/sd[b-f]*
62 * ARR{AY} describes an array giving md device and attributes like uuid=whatever
63 * e.g.
64 * ARRAY /dev/md0 uuid=whatever name=something
65 * Spaces separate words on each line. Quoting, with "" or '' protects them,
66 * but may not wrap over lines
67 *
64c4757e
NB
68 */
69
11a3e71d
NB
70#ifndef CONFFILE
71#define CONFFILE "/etc/mdadm.conf"
72#endif
73char DefaultConfFile[] = CONFFILE;
64c4757e 74
e0d19036 75char *keywords[] = { "device", "array", "mailaddr", "program", NULL };
82b27616
NB
76
77/*
78 * match_keyword returns an index into the keywords array, or -1 for no match
79 * case is ignored, and at least three characters must be given
80 */
81
82int match_keyword(char *word)
83{
52826846
NB
84 int len = strlen(word);
85 int n;
82b27616 86
52826846
NB
87 if (len < 3) return -1;
88 for (n=0; keywords[n]; n++) {
89 if (strncasecmp(word, keywords[n], len)==0)
90 return n;
91 }
92 return -1;
82b27616
NB
93}
94
95/* conf_word gets one word from the conf file.
96 * if "allow_key", then accept words at the start of a line,
97 * otherwise stop when such a word is found.
98 * We assume that the file pointer is at the end of a word, so the
99 * next character is a space, or a newline. If not, it is the start of a line.
100 */
101
102char *conf_word(FILE *file, int allow_key)
103{
52826846
NB
104 int wsize = 100;
105 int len = 0;
106 int c;
107 int quote;
108 int wordfound = 0;
109 char *word = malloc(wsize);
82b27616 110
52826846
NB
111 if (!word) abort();
112
113 while (wordfound==0) {
114 /* at the end of a word.. */
82b27616 115 c = getc(file);
52826846
NB
116 if (c == '#')
117 while (c != EOF && c != '\n')
118 c = getc(file);
119 if (c == EOF) break;
120 if (c == '\n') continue;
121
122 if (c != ' ' && c != '\t' && ! allow_key) {
123 ungetc(c, file);
124 break;
125 }
126 /* looks like it is safe to get a word here, if there is one */
127 quote = 0;
128 /* first, skip any spaces */
129 while (c == ' ' || c == '\t')
130 c = getc(file);
131 if (c != EOF && c != '\n' && c != '#') {
132 /* we really have a character of a word, so start saving it */
133 while (c != EOF && c != '\n' && (quote || (c!=' ' && c != '\t'))) {
134 wordfound = 1;
135 if (quote && c == quote) quote = 0;
136 else if (quote == 0 && (c == '\'' || c == '"'))
137 quote = c;
138 else {
139 if (len == wsize-1) {
140 wsize += 100;
141 word = realloc(word, wsize);
142 if (!word) abort();
143 }
144 word[len++] = c;
145 }
146 c = getc(file);
147 }
148 }
149 if (c != EOF) ungetc(c, file);
82b27616 150 }
52826846 151 word[len] = 0;
82b27616 152/* printf("word is <%s>\n", word); */
52826846
NB
153 if (!wordfound) {
154 free(word);
155 word = NULL;
156 }
157 return word;
82b27616
NB
158}
159
160/*
161 * conf_line reads one logical line from the conffile.
162 * It skips comments and continues until it finds a line that starts
163 * with a non blank/comment. This character is pushed back for the next call
164 * A doubly linked list of words is returned.
165 * the first word will be a keyword. Other words will have had quotes removed.
166 */
167
168char *conf_line(FILE *file)
169{
52826846
NB
170 char *w;
171 char *list;
82b27616 172
52826846
NB
173 w = conf_word(file, 1);
174 if (w == NULL) return NULL;
82b27616 175
52826846 176 list = dl_strdup(w);
82b27616 177 free(w);
52826846
NB
178 dl_init(list);
179
180 while ((w = conf_word(file,0))){
181 char *w2 = dl_strdup(w);
182 free(w);
183 dl_add(list, w2);
184 }
82b27616 185/* printf("got a line\n");*/
52826846 186 return list;
82b27616
NB
187}
188
189void free_line(char *line)
190{
52826846
NB
191 char *w;
192 for (w=dl_next(line); w != line; w=dl_next(line)) {
193 dl_del(w);
194 dl_free(w);
195 }
196 dl_free(line);
82b27616
NB
197}
198
199
200struct conf_dev {
201 struct conf_dev *next;
202 char *name;
203} *cdevlist = NULL;
204
5787fa49
NB
205void load_partitions(void)
206{
207 FILE *f = fopen("/proc/partitions", "r");
208 char buf[1024];
209 if (f == NULL) {
210 fprintf(stderr, Name ": cannot open /proc/partitions\n");
211 return;
212 }
213 while (fgets(buf, 1024, f)) {
214 int major, minor;
98c6faba 215 char *name, *mp;
5787fa49
NB
216 buf[1023] = '\0';
217 if (buf[0] != ' ')
218 continue;
98c6faba
NB
219 major = strtoul(buf, &mp, 10);
220 if (mp == buf || *mp != ' ')
5787fa49 221 continue;
98c6faba
NB
222 minor = strtoul(mp, NULL, 10);
223
5787fa49
NB
224 name = map_dev(major, minor);
225 if (name) {
226 struct conf_dev *cd;
227
228 cd = malloc(sizeof(*cd));
229 cd->name = strdup(name);
230 cd->next = cdevlist;
231 cdevlist = cd;
232 }
233 }
dd0781e5 234 fclose(f);
5787fa49 235}
82b27616
NB
236
237
e0d19036 238void devline(char *line)
82b27616 239{
52826846
NB
240 char *w;
241 struct conf_dev *cd;
242
243 for (w=dl_next(line); w != line; w=dl_next(w)) {
244 if (w[0] == '/') {
245 cd = malloc(sizeof(*cd));
246 cd->name = strdup(w);
247 cd->next = cdevlist;
248 cdevlist = cd;
5787fa49
NB
249 } else if (strcasecmp(w, "partitions") == 0) {
250 /* read /proc/partitions, and look major/minor up in /dev */
251 load_partitions();
52826846
NB
252 } else {
253 fprintf(stderr, Name ": unreconised word on DEVICE line: %s\n",
254 w);
255 }
82b27616 256 }
82b27616
NB
257}
258
52826846
NB
259mddev_ident_t mddevlist = NULL;
260mddev_ident_t *mddevlp = &mddevlist;
82b27616
NB
261
262void arrayline(char *line)
263{
52826846
NB
264 char *w;
265
266 struct mddev_ident_s mis;
267 mddev_ident_t mi;
268
269 mis.uuid_set = 0;
98c6faba
NB
270 mis.super_minor = UnSet;
271 mis.level = UnSet;
272 mis.raid_disks = UnSet;
273 mis.spare_disks = UnSet;
52826846
NB
274 mis.devices = NULL;
275 mis.devname = NULL;
e0d19036 276 mis.spare_group = NULL;
dd0781e5 277 mis.autof = 0;
52826846
NB
278
279 for (w=dl_next(line); w!=line; w=dl_next(w)) {
280 if (w[0] == '/') {
281 if (mis.devname)
282 fprintf(stderr, Name ": only give one device per ARRAY line: %s and %s\n",
283 mis.devname, w);
284 else mis.devname = w;
285 } else if (strncasecmp(w, "uuid=", 5)==0 ) {
286 if (mis.uuid_set)
287 fprintf(stderr, Name ": only specify uuid once, %s ignored.\n",
288 w);
289 else {
290 if (parse_uuid(w+5, mis.uuid))
291 mis.uuid_set = 1;
292 else
293 fprintf(stderr, Name ": bad uuid: %s\n", w);
294 }
295 } else if (strncasecmp(w, "super-minor=", 12)==0 ) {
296 if (mis.super_minor >= 0)
297 fprintf(stderr, Name ": only specify super-minor once, %s ignored.\n",
298 w);
299 else {
300 char *endptr;
301 mis.super_minor= strtol(w+12, &endptr, 10);
302 if (w[12]==0 || endptr[0]!=0 || mis.super_minor < 0) {
303 fprintf(stderr, Name ": invalid super-minor number: %s\n",
304 w);
98c6faba 305 mis.super_minor = UnSet;
52826846
NB
306 }
307 }
308 } else if (strncasecmp(w, "devices=", 8 ) == 0 ) {
309 if (mis.devices)
310 fprintf(stderr, Name ": only specify devices once (use a comma separated list). %s ignored\n",
311 w);
312 else
313 mis.devices = strdup(w+8);
314 } else if (strncasecmp(w, "spare-group=", 12) == 0 ) {
315 if (mis.spare_group)
316 fprintf(stderr, Name ": only specify one spare group per array. %s ignored.\n",
317 w);
318 else
319 mis.spare_group = strdup(w+12);
cd29a5c8
NB
320 } else if (strncasecmp(w, "level=", 6) == 0 ) {
321 /* this is mainly for compatability with --brief output */
322 mis.level = map_name(pers, w+6);
323 } else if (strncasecmp(w, "disks=", 6) == 0 ) {
324 /* again, for compat */
feb716e9 325 mis.raid_disks = atoi(w+6);
b83d95f3
NB
326 } else if (strncasecmp(w, "num-devices=", 12) == 0 ) {
327 /* again, for compat */
feb716e9
NB
328 mis.raid_disks = atoi(w+12);
329 } else if (strncasecmp(w, "spares=", 7) == 0 ) {
330 /* for warning if not all spares present */
331 mis.spare_disks = atoi(w+7);
dd0781e5
NB
332 } else if (strncasecmp(w, "auto=", 5) == 0 ) {
333 /* whether to create device special files as needed */
334 if (strcasecmp(w+5, "no")==0)
335 mis.autof = 0;
336 else if (strcasecmp(w+5,"yes")==0 || strcasecmp(w+5,"md")==0)
337 mis.autof = -1;
338 else {
339 /* There might be digits, and maybe a hypen, at the end */
340 char *e = w+5 + strlen(w+5);
341 int num = 4;
342 int len;
343 while (e > w+5 && isdigit(e[-1]))
344 e--;
345 if (*e) {
346 num = atoi(e);
347 if (num <= 0) num = 1;
348 }
349 if (e > w+5 && e[-1] == '-')
350 e--;
351 len = e - (w+5);
352 if ((len == 3 && strncasecmp(w+5,"mdp",3)==0) ||
353 (len == 1 && strncasecmp(w+5,"p",1)==0) ||
354 (len >= 4 && strncasecmp(w+5,"part",4)==0))
355 mis.autof = num;
356 else
357 fprintf(stderr, Name ": auto type of \"%s\" ignored for %s\n",
358 w+5, mis.devname?mis.devname:"unlabeled-array");
359 }
52826846
NB
360 } else {
361 fprintf(stderr, Name ": unrecognised word on ARRAY line: %s\n",
362 w);
363 }
364 }
365 if (mis.devname == NULL)
dd0781e5 366 fprintf(stderr, Name ": ARRAY line with no device\n");
52826846
NB
367 else if (mis.uuid_set == 0 && mis.devices == NULL && mis.super_minor < 0)
368 fprintf(stderr, Name ": ARRAY line %s has no identity information.\n", mis.devname);
369 else {
370 mi = malloc(sizeof(*mi));
371 *mi = mis;
372 mi->devname = strdup(mis.devname);
373 mi->next = NULL;
374 *mddevlp = mi;
375 mddevlp = &mi->next;
82b27616 376 }
82b27616 377}
e0d19036
NB
378
379static char *alert_email = NULL;
380void mailline(char *line)
381{
382 char *w;
383
384 for (w=dl_next(line); w != line ; w=dl_next(w)) {
385 if (alert_email == NULL)
386 alert_email = strdup(w);
387 else
388 fprintf(stderr, Name ": excess address on MAIL line: %s - ignored\n",
389 w);
390 }
391}
392
393
394static char *alert_program = NULL;
395void programline(char *line)
396{
397 char *w;
398
399 for (w=dl_next(line); w != line ; w=dl_next(w)) {
400 if (alert_program == NULL)
401 alert_program = strdup(w);
402 else
403 fprintf(stderr, Name ": excess program on PROGRAM line: %s - ignored\n",
404 w);
405 }
406}
407
408
82b27616
NB
409int loaded = 0;
410
411void load_conffile(char *conffile)
412{
52826846
NB
413 FILE *f;
414 char *line;
415
416 if (loaded) return;
417 if (conffile == NULL)
418 conffile = DefaultConfFile;
419
d013a55e
NB
420 if (strcmp(conffile, "none") == 0) {
421 loaded = 1;
422 return;
423 }
5787fa49
NB
424 if (strcmp(conffile, "partitions")==0) {
425 load_partitions();
d013a55e 426 loaded = 1;
5787fa49
NB
427 return;
428 }
52826846
NB
429 f = fopen(conffile, "r");
430 if (f ==NULL)
431 return;
432
433 loaded = 1;
434 while ((line=conf_line(f))) {
435 switch(match_keyword(line)) {
436 case 0: /* DEVICE */
437 devline(line);
438 break;
e0d19036 439 case 1: /* ARRAY */
52826846
NB
440 arrayline(line);
441 break;
e0d19036
NB
442 case 2: /* MAIL */
443 mailline(line);
444 break;
445 case 3: /* PROGRAM */
446 programline(line);
447 break;
52826846
NB
448 default:
449 fprintf(stderr, Name ": Unknown keyword %s\n", line);
450 }
451 free_line(line);
82b27616 452 }
82b27616 453
dd0781e5 454 fclose(f);
82b27616
NB
455
456/* printf("got file\n"); */
457}
458
e0d19036
NB
459char *conf_get_mailaddr(char *conffile)
460{
461 load_conffile(conffile);
462 return alert_email;
463}
464
465char *conf_get_program(char *conffile)
466{
467 load_conffile(conffile);
468 return alert_program;
469}
470
82b27616 471
52826846 472mddev_ident_t conf_get_ident(char *conffile, char *dev)
64c4757e 473{
52826846
NB
474 mddev_ident_t rv;
475 load_conffile(conffile);
476 rv = mddevlist;
477 while (dev && rv && strcmp(dev, rv->devname)!=0)
478 rv = rv->next;
479 return rv;
64c4757e
NB
480}
481
482mddev_dev_t conf_get_devs(char *conffile)
483{
52826846
NB
484 glob_t globbuf;
485 struct conf_dev *cd;
486 int flags = 0;
487 static mddev_dev_t dlist = NULL;
98c6faba 488 unsigned int i;
52826846
NB
489
490 while (dlist) {
491 mddev_dev_t t = dlist;
492 dlist = dlist->next;
493 free(t->devname);
494 free(t);
495 }
82b27616 496
52826846 497 load_conffile(conffile);
82b27616 498
52826846
NB
499 for (cd=cdevlist; cd; cd=cd->next) {
500 glob(cd->name, flags, NULL, &globbuf);
501 flags |= GLOB_APPEND;
502 }
e0d19036
NB
503 if (flags & GLOB_APPEND) {
504 for (i=0; i<globbuf.gl_pathc; i++) {
505 mddev_dev_t t = malloc(sizeof(*t));
506 t->devname = strdup(globbuf.gl_pathv[i]);
507 t->next = dlist;
508 dlist = t;
82b27616 509/* printf("one dev is %s\n", t->devname);*/
e0d19036
NB
510 }
511 globfree(&globbuf);
52826846 512 }
82b27616 513
52826846 514 return dlist;
64c4757e
NB
515}
516
52826846
NB
517int match_oneof(char *devices, char *devname)
518{
519 /* check if one of the comma separated patterns in devices
520 * matches devname
521 */
522
523
524 while (devices && *devices) {
525 char patn[1024];
526 char *p = devices;
527 devices = strchr(devices, ',');
528 if (!devices)
529 devices = p + strlen(p);
530 if (devices-p < 1024) {
531 strncpy(patn, p, devices-p);
532 patn[devices-p] = 0;
533 if (fnmatch(patn, devname, FNM_PATHNAME)==0)
534 return 1;
535 }
536 if (*devices == ',')
537 devices++;
538 }
539 return 0;
540}