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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 | ||
9a9dab36 | 68 | char DefaultConfFile[] = "/etc/mdadm.conf"; |
64c4757e | 69 | |
82b27616 NB |
70 | char *keywords[] = { "device", "array", NULL }; |
71 | ||
72 | /* | |
73 | * match_keyword returns an index into the keywords array, or -1 for no match | |
74 | * case is ignored, and at least three characters must be given | |
75 | */ | |
76 | ||
77 | int match_keyword(char *word) | |
78 | { | |
52826846 NB |
79 | int len = strlen(word); |
80 | int n; | |
82b27616 | 81 | |
52826846 NB |
82 | if (len < 3) return -1; |
83 | for (n=0; keywords[n]; n++) { | |
84 | if (strncasecmp(word, keywords[n], len)==0) | |
85 | return n; | |
86 | } | |
87 | return -1; | |
82b27616 NB |
88 | } |
89 | ||
90 | /* conf_word gets one word from the conf file. | |
91 | * if "allow_key", then accept words at the start of a line, | |
92 | * otherwise stop when such a word is found. | |
93 | * We assume that the file pointer is at the end of a word, so the | |
94 | * next character is a space, or a newline. If not, it is the start of a line. | |
95 | */ | |
96 | ||
97 | char *conf_word(FILE *file, int allow_key) | |
98 | { | |
52826846 NB |
99 | int wsize = 100; |
100 | int len = 0; | |
101 | int c; | |
102 | int quote; | |
103 | int wordfound = 0; | |
104 | char *word = malloc(wsize); | |
82b27616 | 105 | |
52826846 NB |
106 | if (!word) abort(); |
107 | ||
108 | while (wordfound==0) { | |
109 | /* at the end of a word.. */ | |
82b27616 | 110 | c = getc(file); |
52826846 NB |
111 | if (c == '#') |
112 | while (c != EOF && c != '\n') | |
113 | c = getc(file); | |
114 | if (c == EOF) break; | |
115 | if (c == '\n') continue; | |
116 | ||
117 | if (c != ' ' && c != '\t' && ! allow_key) { | |
118 | ungetc(c, file); | |
119 | break; | |
120 | } | |
121 | /* looks like it is safe to get a word here, if there is one */ | |
122 | quote = 0; | |
123 | /* first, skip any spaces */ | |
124 | while (c == ' ' || c == '\t') | |
125 | c = getc(file); | |
126 | if (c != EOF && c != '\n' && c != '#') { | |
127 | /* we really have a character of a word, so start saving it */ | |
128 | while (c != EOF && c != '\n' && (quote || (c!=' ' && c != '\t'))) { | |
129 | wordfound = 1; | |
130 | if (quote && c == quote) quote = 0; | |
131 | else if (quote == 0 && (c == '\'' || c == '"')) | |
132 | quote = c; | |
133 | else { | |
134 | if (len == wsize-1) { | |
135 | wsize += 100; | |
136 | word = realloc(word, wsize); | |
137 | if (!word) abort(); | |
138 | } | |
139 | word[len++] = c; | |
140 | } | |
141 | c = getc(file); | |
142 | } | |
143 | } | |
144 | if (c != EOF) ungetc(c, file); | |
82b27616 | 145 | } |
52826846 | 146 | word[len] = 0; |
82b27616 | 147 | /* printf("word is <%s>\n", word); */ |
52826846 NB |
148 | if (!wordfound) { |
149 | free(word); | |
150 | word = NULL; | |
151 | } | |
152 | return word; | |
82b27616 NB |
153 | } |
154 | ||
155 | /* | |
156 | * conf_line reads one logical line from the conffile. | |
157 | * It skips comments and continues until it finds a line that starts | |
158 | * with a non blank/comment. This character is pushed back for the next call | |
159 | * A doubly linked list of words is returned. | |
160 | * the first word will be a keyword. Other words will have had quotes removed. | |
161 | */ | |
162 | ||
163 | char *conf_line(FILE *file) | |
164 | { | |
52826846 NB |
165 | char *w; |
166 | char *list; | |
82b27616 | 167 | |
52826846 NB |
168 | w = conf_word(file, 1); |
169 | if (w == NULL) return NULL; | |
82b27616 | 170 | |
52826846 | 171 | list = dl_strdup(w); |
82b27616 | 172 | free(w); |
52826846 NB |
173 | dl_init(list); |
174 | ||
175 | while ((w = conf_word(file,0))){ | |
176 | char *w2 = dl_strdup(w); | |
177 | free(w); | |
178 | dl_add(list, w2); | |
179 | } | |
82b27616 | 180 | /* printf("got a line\n");*/ |
52826846 | 181 | return list; |
82b27616 NB |
182 | } |
183 | ||
184 | void free_line(char *line) | |
185 | { | |
52826846 NB |
186 | char *w; |
187 | for (w=dl_next(line); w != line; w=dl_next(line)) { | |
188 | dl_del(w); | |
189 | dl_free(w); | |
190 | } | |
191 | dl_free(line); | |
82b27616 NB |
192 | } |
193 | ||
194 | ||
195 | struct conf_dev { | |
196 | struct conf_dev *next; | |
197 | char *name; | |
198 | } *cdevlist = NULL; | |
199 | ||
200 | ||
201 | ||
202 | int devline(char *line) | |
203 | { | |
52826846 NB |
204 | char *w; |
205 | struct conf_dev *cd; | |
206 | ||
207 | for (w=dl_next(line); w != line; w=dl_next(w)) { | |
208 | if (w[0] == '/') { | |
209 | cd = malloc(sizeof(*cd)); | |
210 | cd->name = strdup(w); | |
211 | cd->next = cdevlist; | |
212 | cdevlist = cd; | |
213 | } else { | |
214 | fprintf(stderr, Name ": unreconised word on DEVICE line: %s\n", | |
215 | w); | |
216 | } | |
82b27616 | 217 | } |
82b27616 NB |
218 | } |
219 | ||
52826846 NB |
220 | mddev_ident_t mddevlist = NULL; |
221 | mddev_ident_t *mddevlp = &mddevlist; | |
82b27616 NB |
222 | |
223 | void arrayline(char *line) | |
224 | { | |
52826846 NB |
225 | char *w; |
226 | ||
227 | struct mddev_ident_s mis; | |
228 | mddev_ident_t mi; | |
229 | ||
230 | mis.uuid_set = 0; | |
231 | mis.super_minor = -1; | |
cd29a5c8 NB |
232 | mis.level = -10; |
233 | mis.raid_disks = -1; | |
52826846 NB |
234 | mis.devices = NULL; |
235 | mis.devname = NULL; | |
236 | ||
237 | for (w=dl_next(line); w!=line; w=dl_next(w)) { | |
238 | if (w[0] == '/') { | |
239 | if (mis.devname) | |
240 | fprintf(stderr, Name ": only give one device per ARRAY line: %s and %s\n", | |
241 | mis.devname, w); | |
242 | else mis.devname = w; | |
243 | } else if (strncasecmp(w, "uuid=", 5)==0 ) { | |
244 | if (mis.uuid_set) | |
245 | fprintf(stderr, Name ": only specify uuid once, %s ignored.\n", | |
246 | w); | |
247 | else { | |
248 | if (parse_uuid(w+5, mis.uuid)) | |
249 | mis.uuid_set = 1; | |
250 | else | |
251 | fprintf(stderr, Name ": bad uuid: %s\n", w); | |
252 | } | |
253 | } else if (strncasecmp(w, "super-minor=", 12)==0 ) { | |
254 | if (mis.super_minor >= 0) | |
255 | fprintf(stderr, Name ": only specify super-minor once, %s ignored.\n", | |
256 | w); | |
257 | else { | |
258 | char *endptr; | |
259 | mis.super_minor= strtol(w+12, &endptr, 10); | |
260 | if (w[12]==0 || endptr[0]!=0 || mis.super_minor < 0) { | |
261 | fprintf(stderr, Name ": invalid super-minor number: %s\n", | |
262 | w); | |
263 | mis.super_minor = -1; | |
264 | } | |
265 | } | |
266 | } else if (strncasecmp(w, "devices=", 8 ) == 0 ) { | |
267 | if (mis.devices) | |
268 | fprintf(stderr, Name ": only specify devices once (use a comma separated list). %s ignored\n", | |
269 | w); | |
270 | else | |
271 | mis.devices = strdup(w+8); | |
272 | } else if (strncasecmp(w, "spare-group=", 12) == 0 ) { | |
273 | if (mis.spare_group) | |
274 | fprintf(stderr, Name ": only specify one spare group per array. %s ignored.\n", | |
275 | w); | |
276 | else | |
277 | mis.spare_group = strdup(w+12); | |
cd29a5c8 NB |
278 | } else if (strncasecmp(w, "level=", 6) == 0 ) { |
279 | /* this is mainly for compatability with --brief output */ | |
280 | mis.level = map_name(pers, w+6); | |
281 | } else if (strncasecmp(w, "disks=", 6) == 0 ) { | |
282 | /* again, for compat */ | |
283 | mis.raid_disks = atoi(w+6); | |
52826846 NB |
284 | } else { |
285 | fprintf(stderr, Name ": unrecognised word on ARRAY line: %s\n", | |
286 | w); | |
287 | } | |
288 | } | |
289 | if (mis.devname == NULL) | |
290 | fprintf(stderr, Name ": ARRAY line with a device\n"); | |
291 | else if (mis.uuid_set == 0 && mis.devices == NULL && mis.super_minor < 0) | |
292 | fprintf(stderr, Name ": ARRAY line %s has no identity information.\n", mis.devname); | |
293 | else { | |
294 | mi = malloc(sizeof(*mi)); | |
295 | *mi = mis; | |
296 | mi->devname = strdup(mis.devname); | |
297 | mi->next = NULL; | |
298 | *mddevlp = mi; | |
299 | mddevlp = &mi->next; | |
82b27616 | 300 | } |
82b27616 NB |
301 | } |
302 | ||
303 | int loaded = 0; | |
304 | ||
305 | void load_conffile(char *conffile) | |
306 | { | |
52826846 NB |
307 | FILE *f; |
308 | char *line; | |
309 | ||
310 | if (loaded) return; | |
311 | if (conffile == NULL) | |
312 | conffile = DefaultConfFile; | |
313 | ||
314 | f = fopen(conffile, "r"); | |
315 | if (f ==NULL) | |
316 | return; | |
317 | ||
318 | loaded = 1; | |
319 | while ((line=conf_line(f))) { | |
320 | switch(match_keyword(line)) { | |
321 | case 0: /* DEVICE */ | |
322 | devline(line); | |
323 | break; | |
324 | case 1: | |
325 | arrayline(line); | |
326 | break; | |
327 | default: | |
328 | fprintf(stderr, Name ": Unknown keyword %s\n", line); | |
329 | } | |
330 | free_line(line); | |
82b27616 | 331 | } |
82b27616 NB |
332 | |
333 | ||
334 | /* printf("got file\n"); */ | |
335 | } | |
336 | ||
337 | ||
52826846 | 338 | mddev_ident_t conf_get_ident(char *conffile, char *dev) |
64c4757e | 339 | { |
52826846 NB |
340 | mddev_ident_t rv; |
341 | load_conffile(conffile); | |
342 | rv = mddevlist; | |
343 | while (dev && rv && strcmp(dev, rv->devname)!=0) | |
344 | rv = rv->next; | |
345 | return rv; | |
64c4757e NB |
346 | } |
347 | ||
348 | mddev_dev_t conf_get_devs(char *conffile) | |
349 | { | |
52826846 NB |
350 | glob_t globbuf; |
351 | struct conf_dev *cd; | |
352 | int flags = 0; | |
353 | static mddev_dev_t dlist = NULL; | |
354 | int i; | |
355 | ||
356 | while (dlist) { | |
357 | mddev_dev_t t = dlist; | |
358 | dlist = dlist->next; | |
359 | free(t->devname); | |
360 | free(t); | |
361 | } | |
82b27616 | 362 | |
52826846 | 363 | load_conffile(conffile); |
82b27616 | 364 | |
52826846 NB |
365 | for (cd=cdevlist; cd; cd=cd->next) { |
366 | glob(cd->name, flags, NULL, &globbuf); | |
367 | flags |= GLOB_APPEND; | |
368 | } | |
82b27616 | 369 | |
52826846 NB |
370 | for (i=0; i<globbuf.gl_pathc; i++) { |
371 | mddev_dev_t t = malloc(sizeof(*t)); | |
372 | t->devname = strdup(globbuf.gl_pathv[i]); | |
373 | t->next = dlist; | |
374 | dlist = t; | |
82b27616 | 375 | /* printf("one dev is %s\n", t->devname);*/ |
52826846 NB |
376 | } |
377 | globfree(&globbuf); | |
82b27616 NB |
378 | |
379 | ||
52826846 | 380 | return dlist; |
64c4757e NB |
381 | } |
382 | ||
52826846 NB |
383 | int match_oneof(char *devices, char *devname) |
384 | { | |
385 | /* check if one of the comma separated patterns in devices | |
386 | * matches devname | |
387 | */ | |
388 | ||
389 | ||
390 | while (devices && *devices) { | |
391 | char patn[1024]; | |
392 | char *p = devices; | |
393 | devices = strchr(devices, ','); | |
394 | if (!devices) | |
395 | devices = p + strlen(p); | |
396 | if (devices-p < 1024) { | |
397 | strncpy(patn, p, devices-p); | |
398 | patn[devices-p] = 0; | |
399 | if (fnmatch(patn, devname, FNM_PATHNAME)==0) | |
400 | return 1; | |
401 | } | |
402 | if (*devices == ',') | |
403 | devices++; | |
404 | } | |
405 | return 0; | |
406 | } |