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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 NB |
31 | #include "dlink.h" |
32 | #include <glob.h> | |
52826846 NB |
33 | #include <fnmatch.h> |
34 | ||
64c4757e NB |
35 | /* |
36 | * Read the config file | |
37 | * | |
38 | * conf_get_uuids gets a list of devicename+uuid pairs | |
39 | * conf_get_devs gets device names after expanding wildcards | |
40 | * | |
41 | * Each keeps the returned list and frees it when asked to make | |
42 | * a new list. | |
43 | * | |
82b27616 NB |
44 | * The format of the config file needs to be fairly extensible. |
45 | * Now, arrays only have names and uuids and devices merely are. | |
46 | * But later arrays might want names, and devices might want superblock | |
47 | * versions, and who knows what else. | |
48 | * I like free format, abhore backslash line continuation, adore | |
49 | * indentation for structure and am ok about # comments. | |
50 | * | |
51 | * So, each line that isn't blank or a #comment must either start | |
52 | * with a key word, and not be indented, or must start with a | |
53 | * non-key-word and must be indented. | |
54 | * | |
55 | * Keywords are DEVICE and ARRAY | |
56 | * DEV{ICE} introduces some devices that might contain raid components. | |
57 | * e.g. | |
58 | * DEV style=0 /dev/sda* /dev/hd* | |
59 | * DEV style=1 /dev/sd[b-f]* | |
60 | * ARR{AY} describes an array giving md device and attributes like uuid=whatever | |
61 | * e.g. | |
62 | * ARRAY /dev/md0 uuid=whatever name=something | |
63 | * Spaces separate words on each line. Quoting, with "" or '' protects them, | |
64 | * but may not wrap over lines | |
65 | * | |
64c4757e NB |
66 | */ |
67 | ||
11a3e71d NB |
68 | #ifndef CONFFILE |
69 | #define CONFFILE "/etc/mdadm.conf" | |
70 | #endif | |
71 | char DefaultConfFile[] = CONFFILE; | |
64c4757e | 72 | |
82b27616 NB |
73 | char *keywords[] = { "device", "array", NULL }; |
74 | ||
75 | /* | |
76 | * match_keyword returns an index into the keywords array, or -1 for no match | |
77 | * case is ignored, and at least three characters must be given | |
78 | */ | |
79 | ||
80 | int match_keyword(char *word) | |
81 | { | |
52826846 NB |
82 | int len = strlen(word); |
83 | int n; | |
82b27616 | 84 | |
52826846 NB |
85 | if (len < 3) return -1; |
86 | for (n=0; keywords[n]; n++) { | |
87 | if (strncasecmp(word, keywords[n], len)==0) | |
88 | return n; | |
89 | } | |
90 | return -1; | |
82b27616 NB |
91 | } |
92 | ||
93 | /* conf_word gets one word from the conf file. | |
94 | * if "allow_key", then accept words at the start of a line, | |
95 | * otherwise stop when such a word is found. | |
96 | * We assume that the file pointer is at the end of a word, so the | |
97 | * next character is a space, or a newline. If not, it is the start of a line. | |
98 | */ | |
99 | ||
100 | char *conf_word(FILE *file, int allow_key) | |
101 | { | |
52826846 NB |
102 | int wsize = 100; |
103 | int len = 0; | |
104 | int c; | |
105 | int quote; | |
106 | int wordfound = 0; | |
107 | char *word = malloc(wsize); | |
82b27616 | 108 | |
52826846 NB |
109 | if (!word) abort(); |
110 | ||
111 | while (wordfound==0) { | |
112 | /* at the end of a word.. */ | |
82b27616 | 113 | c = getc(file); |
52826846 NB |
114 | if (c == '#') |
115 | while (c != EOF && c != '\n') | |
116 | c = getc(file); | |
117 | if (c == EOF) break; | |
118 | if (c == '\n') continue; | |
119 | ||
120 | if (c != ' ' && c != '\t' && ! allow_key) { | |
121 | ungetc(c, file); | |
122 | break; | |
123 | } | |
124 | /* looks like it is safe to get a word here, if there is one */ | |
125 | quote = 0; | |
126 | /* first, skip any spaces */ | |
127 | while (c == ' ' || c == '\t') | |
128 | c = getc(file); | |
129 | if (c != EOF && c != '\n' && c != '#') { | |
130 | /* we really have a character of a word, so start saving it */ | |
131 | while (c != EOF && c != '\n' && (quote || (c!=' ' && c != '\t'))) { | |
132 | wordfound = 1; | |
133 | if (quote && c == quote) quote = 0; | |
134 | else if (quote == 0 && (c == '\'' || c == '"')) | |
135 | quote = c; | |
136 | else { | |
137 | if (len == wsize-1) { | |
138 | wsize += 100; | |
139 | word = realloc(word, wsize); | |
140 | if (!word) abort(); | |
141 | } | |
142 | word[len++] = c; | |
143 | } | |
144 | c = getc(file); | |
145 | } | |
146 | } | |
147 | if (c != EOF) ungetc(c, file); | |
82b27616 | 148 | } |
52826846 | 149 | word[len] = 0; |
82b27616 | 150 | /* printf("word is <%s>\n", word); */ |
52826846 NB |
151 | if (!wordfound) { |
152 | free(word); | |
153 | word = NULL; | |
154 | } | |
155 | return word; | |
82b27616 NB |
156 | } |
157 | ||
158 | /* | |
159 | * conf_line reads one logical line from the conffile. | |
160 | * It skips comments and continues until it finds a line that starts | |
161 | * with a non blank/comment. This character is pushed back for the next call | |
162 | * A doubly linked list of words is returned. | |
163 | * the first word will be a keyword. Other words will have had quotes removed. | |
164 | */ | |
165 | ||
166 | char *conf_line(FILE *file) | |
167 | { | |
52826846 NB |
168 | char *w; |
169 | char *list; | |
82b27616 | 170 | |
52826846 NB |
171 | w = conf_word(file, 1); |
172 | if (w == NULL) return NULL; | |
82b27616 | 173 | |
52826846 | 174 | list = dl_strdup(w); |
82b27616 | 175 | free(w); |
52826846 NB |
176 | dl_init(list); |
177 | ||
178 | while ((w = conf_word(file,0))){ | |
179 | char *w2 = dl_strdup(w); | |
180 | free(w); | |
181 | dl_add(list, w2); | |
182 | } | |
82b27616 | 183 | /* printf("got a line\n");*/ |
52826846 | 184 | return list; |
82b27616 NB |
185 | } |
186 | ||
187 | void free_line(char *line) | |
188 | { | |
52826846 NB |
189 | char *w; |
190 | for (w=dl_next(line); w != line; w=dl_next(line)) { | |
191 | dl_del(w); | |
192 | dl_free(w); | |
193 | } | |
194 | dl_free(line); | |
82b27616 NB |
195 | } |
196 | ||
197 | ||
198 | struct conf_dev { | |
199 | struct conf_dev *next; | |
200 | char *name; | |
201 | } *cdevlist = NULL; | |
202 | ||
203 | ||
204 | ||
205 | int devline(char *line) | |
206 | { | |
52826846 NB |
207 | char *w; |
208 | struct conf_dev *cd; | |
209 | ||
210 | for (w=dl_next(line); w != line; w=dl_next(w)) { | |
211 | if (w[0] == '/') { | |
212 | cd = malloc(sizeof(*cd)); | |
213 | cd->name = strdup(w); | |
214 | cd->next = cdevlist; | |
215 | cdevlist = cd; | |
216 | } else { | |
217 | fprintf(stderr, Name ": unreconised word on DEVICE line: %s\n", | |
218 | w); | |
219 | } | |
82b27616 | 220 | } |
82b27616 NB |
221 | } |
222 | ||
52826846 NB |
223 | mddev_ident_t mddevlist = NULL; |
224 | mddev_ident_t *mddevlp = &mddevlist; | |
82b27616 NB |
225 | |
226 | void arrayline(char *line) | |
227 | { | |
52826846 NB |
228 | char *w; |
229 | ||
230 | struct mddev_ident_s mis; | |
231 | mddev_ident_t mi; | |
232 | ||
233 | mis.uuid_set = 0; | |
234 | mis.super_minor = -1; | |
cd29a5c8 NB |
235 | mis.level = -10; |
236 | mis.raid_disks = -1; | |
52826846 NB |
237 | mis.devices = NULL; |
238 | mis.devname = NULL; | |
239 | ||
240 | for (w=dl_next(line); w!=line; w=dl_next(w)) { | |
241 | if (w[0] == '/') { | |
242 | if (mis.devname) | |
243 | fprintf(stderr, Name ": only give one device per ARRAY line: %s and %s\n", | |
244 | mis.devname, w); | |
245 | else mis.devname = w; | |
246 | } else if (strncasecmp(w, "uuid=", 5)==0 ) { | |
247 | if (mis.uuid_set) | |
248 | fprintf(stderr, Name ": only specify uuid once, %s ignored.\n", | |
249 | w); | |
250 | else { | |
251 | if (parse_uuid(w+5, mis.uuid)) | |
252 | mis.uuid_set = 1; | |
253 | else | |
254 | fprintf(stderr, Name ": bad uuid: %s\n", w); | |
255 | } | |
256 | } else if (strncasecmp(w, "super-minor=", 12)==0 ) { | |
257 | if (mis.super_minor >= 0) | |
258 | fprintf(stderr, Name ": only specify super-minor once, %s ignored.\n", | |
259 | w); | |
260 | else { | |
261 | char *endptr; | |
262 | mis.super_minor= strtol(w+12, &endptr, 10); | |
263 | if (w[12]==0 || endptr[0]!=0 || mis.super_minor < 0) { | |
264 | fprintf(stderr, Name ": invalid super-minor number: %s\n", | |
265 | w); | |
266 | mis.super_minor = -1; | |
267 | } | |
268 | } | |
269 | } else if (strncasecmp(w, "devices=", 8 ) == 0 ) { | |
270 | if (mis.devices) | |
271 | fprintf(stderr, Name ": only specify devices once (use a comma separated list). %s ignored\n", | |
272 | w); | |
273 | else | |
274 | mis.devices = strdup(w+8); | |
275 | } else if (strncasecmp(w, "spare-group=", 12) == 0 ) { | |
276 | if (mis.spare_group) | |
277 | fprintf(stderr, Name ": only specify one spare group per array. %s ignored.\n", | |
278 | w); | |
279 | else | |
280 | mis.spare_group = strdup(w+12); | |
cd29a5c8 NB |
281 | } else if (strncasecmp(w, "level=", 6) == 0 ) { |
282 | /* this is mainly for compatability with --brief output */ | |
283 | mis.level = map_name(pers, w+6); | |
284 | } else if (strncasecmp(w, "disks=", 6) == 0 ) { | |
285 | /* again, for compat */ | |
286 | mis.raid_disks = atoi(w+6); | |
52826846 NB |
287 | } else { |
288 | fprintf(stderr, Name ": unrecognised word on ARRAY line: %s\n", | |
289 | w); | |
290 | } | |
291 | } | |
292 | if (mis.devname == NULL) | |
293 | fprintf(stderr, Name ": ARRAY line with a device\n"); | |
294 | else if (mis.uuid_set == 0 && mis.devices == NULL && mis.super_minor < 0) | |
295 | fprintf(stderr, Name ": ARRAY line %s has no identity information.\n", mis.devname); | |
296 | else { | |
297 | mi = malloc(sizeof(*mi)); | |
298 | *mi = mis; | |
299 | mi->devname = strdup(mis.devname); | |
300 | mi->next = NULL; | |
301 | *mddevlp = mi; | |
302 | mddevlp = &mi->next; | |
82b27616 | 303 | } |
82b27616 NB |
304 | } |
305 | ||
306 | int loaded = 0; | |
307 | ||
308 | void load_conffile(char *conffile) | |
309 | { | |
52826846 NB |
310 | FILE *f; |
311 | char *line; | |
312 | ||
313 | if (loaded) return; | |
314 | if (conffile == NULL) | |
315 | conffile = DefaultConfFile; | |
316 | ||
317 | f = fopen(conffile, "r"); | |
318 | if (f ==NULL) | |
319 | return; | |
320 | ||
321 | loaded = 1; | |
322 | while ((line=conf_line(f))) { | |
323 | switch(match_keyword(line)) { | |
324 | case 0: /* DEVICE */ | |
325 | devline(line); | |
326 | break; | |
327 | case 1: | |
328 | arrayline(line); | |
329 | break; | |
330 | default: | |
331 | fprintf(stderr, Name ": Unknown keyword %s\n", line); | |
332 | } | |
333 | free_line(line); | |
82b27616 | 334 | } |
82b27616 NB |
335 | |
336 | ||
337 | /* printf("got file\n"); */ | |
338 | } | |
339 | ||
340 | ||
52826846 | 341 | mddev_ident_t conf_get_ident(char *conffile, char *dev) |
64c4757e | 342 | { |
52826846 NB |
343 | mddev_ident_t rv; |
344 | load_conffile(conffile); | |
345 | rv = mddevlist; | |
346 | while (dev && rv && strcmp(dev, rv->devname)!=0) | |
347 | rv = rv->next; | |
348 | return rv; | |
64c4757e NB |
349 | } |
350 | ||
351 | mddev_dev_t conf_get_devs(char *conffile) | |
352 | { | |
52826846 NB |
353 | glob_t globbuf; |
354 | struct conf_dev *cd; | |
355 | int flags = 0; | |
356 | static mddev_dev_t dlist = NULL; | |
357 | int i; | |
358 | ||
359 | while (dlist) { | |
360 | mddev_dev_t t = dlist; | |
361 | dlist = dlist->next; | |
362 | free(t->devname); | |
363 | free(t); | |
364 | } | |
82b27616 | 365 | |
52826846 | 366 | load_conffile(conffile); |
82b27616 | 367 | |
52826846 NB |
368 | for (cd=cdevlist; cd; cd=cd->next) { |
369 | glob(cd->name, flags, NULL, &globbuf); | |
370 | flags |= GLOB_APPEND; | |
371 | } | |
82b27616 | 372 | |
52826846 NB |
373 | for (i=0; i<globbuf.gl_pathc; i++) { |
374 | mddev_dev_t t = malloc(sizeof(*t)); | |
375 | t->devname = strdup(globbuf.gl_pathv[i]); | |
376 | t->next = dlist; | |
377 | dlist = t; | |
82b27616 | 378 | /* printf("one dev is %s\n", t->devname);*/ |
52826846 NB |
379 | } |
380 | globfree(&globbuf); | |
82b27616 NB |
381 | |
382 | ||
52826846 | 383 | return dlist; |
64c4757e NB |
384 | } |
385 | ||
52826846 NB |
386 | int match_oneof(char *devices, char *devname) |
387 | { | |
388 | /* check if one of the comma separated patterns in devices | |
389 | * matches devname | |
390 | */ | |
391 | ||
392 | ||
393 | while (devices && *devices) { | |
394 | char patn[1024]; | |
395 | char *p = devices; | |
396 | devices = strchr(devices, ','); | |
397 | if (!devices) | |
398 | devices = p + strlen(p); | |
399 | if (devices-p < 1024) { | |
400 | strncpy(patn, p, devices-p); | |
401 | patn[devices-p] = 0; | |
402 | if (fnmatch(patn, devname, FNM_PATHNAME)==0) | |
403 | return 1; | |
404 | } | |
405 | if (*devices == ',') | |
406 | devices++; | |
407 | } | |
408 | return 0; | |
409 | } |