source: MondoRescue/branches/2.2.5/mindi-busybox/e2fsprogs/old_e2fsprogs/blkid/devname.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
  • Property svn:eol-style set to native
File size: 8.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * devname.c - get a dev by its device inode name
4 *
5 * Copyright (C) Andries Brouwer
6 * Copyright (C) 1999, 2000, 2001, 2002, 2003 Theodore Ts'o
7 * Copyright (C) 2001 Andreas Dilger
8 *
9 * %Begin-Header%
10 * This file may be redistributed under the terms of the
11 * GNU Lesser General Public License.
12 * %End-Header%
13 */
14
15#include <stdio.h>
16#include <string.h>
17#ifdef HAVE_UNISTD_H
18#include <unistd.h>
19#endif
20#include <stdlib.h>
21#include <string.h>
22#include <ctype.h>
23#ifdef HAVE_SYS_TYPES_H
24#include <sys/types.h>
25#endif
26#include <sys/stat.h>
27#ifdef HAVE_ERRNO_H
28#include <errno.h>
29#endif
30#ifdef HAVE_SYS_MKDEV_H
31#include <sys/mkdev.h>
32#endif
33#include <time.h>
34
35#include "blkidP.h"
36
37/*
38 * Find a dev struct in the cache by device name, if available.
39 *
40 * If there is no entry with the specified device name, and the create
41 * flag is set, then create an empty device entry.
42 */
43blkid_dev blkid_get_dev(blkid_cache cache, const char *devname, int flags)
44{
45 blkid_dev dev = NULL, tmp;
46 struct list_head *p;
47
48 if (!cache || !devname)
49 return NULL;
50
51 list_for_each(p, &cache->bic_devs) {
52 tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
53 if (strcmp(tmp->bid_name, devname))
54 continue;
55
56 DBG(DEBUG_DEVNAME,
57 printf("found devname %s in cache\n", tmp->bid_name));
58 dev = tmp;
59 break;
60 }
61
62 if (!dev && (flags & BLKID_DEV_CREATE)) {
63 dev = blkid_new_dev();
64 if (!dev)
65 return NULL;
66 dev->bid_name = blkid_strdup(devname);
67 dev->bid_cache = cache;
68 list_add_tail(&dev->bid_devs, &cache->bic_devs);
69 cache->bic_flags |= BLKID_BIC_FL_CHANGED;
70 }
71
72 if (flags & BLKID_DEV_VERIFY)
73 dev = blkid_verify(cache, dev);
74 return dev;
75}
76
77/*
78 * Probe a single block device to add to the device cache.
79 */
80static void probe_one(blkid_cache cache, const char *ptname,
81 dev_t devno, int pri)
82{
83 blkid_dev dev = NULL;
84 struct list_head *p;
85 const char **dir;
86 char *devname = NULL;
87
88 /* See if we already have this device number in the cache. */
89 list_for_each(p, &cache->bic_devs) {
90 blkid_dev tmp = list_entry(p, struct blkid_struct_dev,
91 bid_devs);
92 if (tmp->bid_devno == devno) {
93 dev = blkid_verify(cache, tmp);
94 break;
95 }
96 }
97 if (dev && dev->bid_devno == devno)
98 goto set_pri;
99
100 /*
101 * Take a quick look at /dev/ptname for the device number. We check
102 * all of the likely device directories. If we don't find it, or if
103 * the stat information doesn't check out, use blkid_devno_to_devname()
104 * to find it via an exhaustive search for the device major/minor.
105 */
106 for (dir = blkid_devdirs; *dir; dir++) {
107 struct stat st;
108 char device[256];
109
110 sprintf(device, "%s/%s", *dir, ptname);
111 if ((dev = blkid_get_dev(cache, device, BLKID_DEV_FIND)) &&
112 dev->bid_devno == devno)
113 goto set_pri;
114
115 if (stat(device, &st) == 0 && S_ISBLK(st.st_mode) &&
116 st.st_rdev == devno) {
117 devname = blkid_strdup(device);
118 break;
119 }
120 }
121 if (!devname) {
122 devname = blkid_devno_to_devname(devno);
123 if (!devname)
124 return;
125 }
126 dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
127 free(devname);
128
129set_pri:
130 if (!pri && !strncmp(ptname, "md", 2))
131 pri = BLKID_PRI_MD;
132 if (dev)
133 dev->bid_pri = pri;
134}
135
136#define PROC_PARTITIONS "/proc/partitions"
137#define VG_DIR "/proc/lvm/VGs"
138
139/*
140 * This function initializes the UUID cache with devices from the LVM
141 * proc hierarchy. We currently depend on the names of the LVM
142 * hierarchy giving us the device structure in /dev. (XXX is this a
143 * safe thing to do?)
144 */
145#ifdef VG_DIR
146#include <dirent.h>
147static dev_t lvm_get_devno(const char *lvm_device)
148{
149 FILE *lvf;
150 char buf[1024];
151 int ma, mi;
152 dev_t ret = 0;
153
154 DBG(DEBUG_DEVNAME, printf("opening %s\n", lvm_device));
155 if ((lvf = fopen(lvm_device, "r")) == NULL) {
156 DBG(DEBUG_DEVNAME, printf("%s: (%d) %s\n", lvm_device, errno,
157 strerror(errno)));
158 return 0;
159 }
160
161 while (fgets(buf, sizeof(buf), lvf)) {
162 if (sscanf(buf, "device: %d:%d", &ma, &mi) == 2) {
163 ret = makedev(ma, mi);
164 break;
165 }
166 }
167 fclose(lvf);
168
169 return ret;
170}
171
172static void lvm_probe_all(blkid_cache cache)
173{
174 DIR *vg_list;
175 struct dirent *vg_iter;
176 int vg_len = strlen(VG_DIR);
177 dev_t dev;
178
179 if ((vg_list = opendir(VG_DIR)) == NULL)
180 return;
181
182 DBG(DEBUG_DEVNAME, printf("probing LVM devices under %s\n", VG_DIR));
183
184 while ((vg_iter = readdir(vg_list)) != NULL) {
185 DIR *lv_list;
186 char *vdirname;
187 char *vg_name;
188 struct dirent *lv_iter;
189
190 vg_name = vg_iter->d_name;
191 if (LONE_CHAR(vg_name, '.') || !strcmp(vg_name, ".."))
192 continue;
193 vdirname = xmalloc(vg_len + strlen(vg_name) + 8);
194 sprintf(vdirname, "%s/%s/LVs", VG_DIR, vg_name);
195
196 lv_list = opendir(vdirname);
197 free(vdirname);
198 if (lv_list == NULL)
199 continue;
200
201 while ((lv_iter = readdir(lv_list)) != NULL) {
202 char *lv_name, *lvm_device;
203
204 lv_name = lv_iter->d_name;
205 if (LONE_CHAR(lv_name, '.') || !strcmp(lv_name, ".."))
206 continue;
207
208 lvm_device = xmalloc(vg_len + strlen(vg_name) +
209 strlen(lv_name) + 8);
210 sprintf(lvm_device, "%s/%s/LVs/%s", VG_DIR, vg_name,
211 lv_name);
212 dev = lvm_get_devno(lvm_device);
213 sprintf(lvm_device, "%s/%s", vg_name, lv_name);
214 DBG(DEBUG_DEVNAME, printf("LVM dev %s: devno 0x%04X\n",
215 lvm_device,
216 (unsigned int) dev));
217 probe_one(cache, lvm_device, dev, BLKID_PRI_LVM);
218 free(lvm_device);
219 }
220 closedir(lv_list);
221 }
222 closedir(vg_list);
223}
224#endif
225
226#define PROC_EVMS_VOLUMES "/proc/evms/volumes"
227
228static int
229evms_probe_all(blkid_cache cache)
230{
231 char line[100];
232 int ma, mi, sz, num = 0;
233 FILE *procpt;
234 char device[110];
235
236 procpt = fopen(PROC_EVMS_VOLUMES, "r");
237 if (!procpt)
238 return 0;
239 while (fgets(line, sizeof(line), procpt)) {
240 if (sscanf (line, " %d %d %d %*s %*s %[^\n ]",
241 &ma, &mi, &sz, device) != 4)
242 continue;
243
244 DBG(DEBUG_DEVNAME, printf("Checking partition %s (%d, %d)\n",
245 device, ma, mi));
246
247 probe_one(cache, device, makedev(ma, mi), BLKID_PRI_EVMS);
248 num++;
249 }
250 fclose(procpt);
251 return num;
252}
253
254/*
255 * Read the device data for all available block devices in the system.
256 */
257int blkid_probe_all(blkid_cache cache)
258{
259 FILE *proc;
260 char line[1024];
261 char ptname0[128], ptname1[128], *ptname = 0;
262 char *ptnames[2];
263 dev_t devs[2];
264 int ma, mi;
265 unsigned long long sz;
266 int lens[2] = { 0, 0 };
267 int which = 0, last = 0;
268
269 ptnames[0] = ptname0;
270 ptnames[1] = ptname1;
271
272 if (!cache)
273 return -BLKID_ERR_PARAM;
274
275 if (cache->bic_flags & BLKID_BIC_FL_PROBED &&
276 time(0) - cache->bic_time < BLKID_PROBE_INTERVAL)
277 return 0;
278
279 blkid_read_cache(cache);
280 evms_probe_all(cache);
281#ifdef VG_DIR
282 lvm_probe_all(cache);
283#endif
284
285 proc = fopen(PROC_PARTITIONS, "r");
286 if (!proc)
287 return -BLKID_ERR_PROC;
288
289 while (fgets(line, sizeof(line), proc)) {
290 last = which;
291 which ^= 1;
292 ptname = ptnames[which];
293
294 if (sscanf(line, " %d %d %llu %128[^\n ]",
295 &ma, &mi, &sz, ptname) != 4)
296 continue;
297 devs[which] = makedev(ma, mi);
298
299 DBG(DEBUG_DEVNAME, printf("read partition name %s\n", ptname));
300
301 /* Skip whole disk devs unless they have no partitions
302 * If we don't have a partition on this dev, also
303 * check previous dev to see if it didn't have a partn.
304 * heuristic: partition name ends in a digit.
305 *
306 * Skip extended partitions.
307 * heuristic: size is 1
308 *
309 * FIXME: skip /dev/{ida,cciss,rd} whole-disk devs
310 */
311
312 lens[which] = strlen(ptname);
313 if (isdigit(ptname[lens[which] - 1])) {
314 DBG(DEBUG_DEVNAME,
315 printf("partition dev %s, devno 0x%04X\n",
316 ptname, (unsigned int) devs[which]));
317
318 if (sz > 1)
319 probe_one(cache, ptname, devs[which], 0);
320 lens[which] = 0;
321 lens[last] = 0;
322 } else if (lens[last] && strncmp(ptnames[last], ptname,
323 lens[last])) {
324 DBG(DEBUG_DEVNAME,
325 printf("whole dev %s, devno 0x%04X\n",
326 ptnames[last], (unsigned int) devs[last]));
327 probe_one(cache, ptnames[last], devs[last], 0);
328 lens[last] = 0;
329 }
330 }
331
332 /* Handle the last device if it wasn't partitioned */
333 if (lens[which])
334 probe_one(cache, ptname, devs[which], 0);
335
336 fclose(proc);
337
338 cache->bic_time = time(0);
339 cache->bic_flags |= BLKID_BIC_FL_PROBED;
340 blkid_flush_cache(cache);
341 return 0;
342}
343
344#ifdef TEST_PROGRAM
345int main(int argc, char **argv)
346{
347 blkid_cache cache = NULL;
348 int ret;
349
350 blkid_debug_mask = DEBUG_ALL;
351 if (argc != 1) {
352 fprintf(stderr, "Usage: %s\n"
353 "Probe all devices and exit\n", argv[0]);
354 exit(1);
355 }
356 if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
357 fprintf(stderr, "%s: error creating cache (%d)\n",
358 argv[0], ret);
359 exit(1);
360 }
361 if (blkid_probe_all(cache) < 0)
362 printf("%s: error probing devices\n", argv[0]);
363
364 blkid_put_cache(cache);
365 return 0;
366}
367#endif
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