2 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
3 * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation version 2 of the License.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
31 #include <sys/types.h>
36 static size_t devpath_to_db_path(const char *devpath, char *filename, size_t len)
40 /* add location of db files */
41 strlcpy(filename, udev_root, len);
42 start = strlcat(filename, "/"DB_DIR"/", len);
43 strlcat(filename, devpath, len);
44 return path_encode(&filename[start], len - start);
47 /* reverse mapping from the device file name to the devpath */
48 static int name_index(const char *devpath, const char *name, int add)
50 char device[PATH_SIZE];
51 char filename[PATH_SIZE * 2];
55 /* directory with device name */
56 strlcpy(filename, udev_root, sizeof(filename));
57 start = strlcat(filename, "/"DB_NAME_INDEX_DIR"/", sizeof(filename));
58 strlcat(filename, name, sizeof(filename));
59 path_encode(&filename[start], sizeof(filename) - start);
60 /* entry with the devpath */
61 strlcpy(device, devpath, sizeof(device));
62 path_encode(device, sizeof(device));
63 strlcat(filename, "/", sizeof(filename));
64 strlcat(filename, device, sizeof(filename));
67 dbg("creating: '%s'", filename);
68 create_path(filename);
69 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
73 dbg("removing: '%s'", filename);
75 delete_path(filename);
80 int udev_db_add_device(struct udevice *udev)
82 char filename[PATH_SIZE];
87 devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename));
88 create_path(filename);
89 name_index(udev->dev->devpath, udev->name, 1);
92 * create only a symlink with the name as the target
93 * if we don't have any interesting data to remember
95 if (list_empty(&udev->symlink_list) && list_empty(&udev->env_list) &&
96 !udev->partitions && !udev->ignore_remove) {
97 dbg("nothing interesting to store, create symlink");
99 if (symlink(udev->name, filename) != 0) {
100 err("unable to create db link '%s': %s", filename, strerror(errno));
104 struct name_entry *name_loop;
108 f = fopen(filename, "w");
110 err("unable to create db file '%s': %s", filename, strerror(errno));
113 dbg("storing data for device '%s' in '%s'", udev->dev->devpath, filename);
115 fprintf(f, "N:%s\n", udev->name);
116 list_for_each_entry(name_loop, &udev->symlink_list, node) {
117 fprintf(f, "S:%s\n", name_loop->name);
118 name_index(udev->dev->devpath, name_loop->name, 1);
120 fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt));
121 if (udev->link_priority)
122 fprintf(f, "L:%u\n", udev->link_priority);
123 if (udev->partitions)
124 fprintf(f, "A:%u\n", udev->partitions);
125 if (udev->ignore_remove)
126 fprintf(f, "R:%u\n", udev->ignore_remove);
127 list_for_each_entry(name_loop, &udev->env_list, node)
128 fprintf(f, "E:%s\n", name_loop->name);
134 int udev_db_get_device(struct udevice *udev, const char *devpath)
137 char filename[PATH_SIZE];
138 char line[PATH_SIZE];
139 unsigned int maj, min;
146 strlcpy(udev->dev->devpath, devpath, sizeof(udev->dev->devpath));
147 devpath_to_db_path(devpath, filename, sizeof(filename));
149 if (lstat(filename, &stats) != 0) {
150 info("no db file to read %s: %s", filename, strerror(errno));
153 if ((stats.st_mode & S_IFMT) == S_IFLNK) {
154 char target[NAME_SIZE];
157 info("found a symlink as db file");
158 target_len = readlink(filename, target, sizeof(target));
160 target[target_len] = '\0';
162 info("error reading db link %s: %s", filename, strerror(errno));
165 dbg("db link points to '%s'", target);
166 strlcpy(udev->name, target, sizeof(udev->name));
170 if (file_map(filename, &buf, &bufsize) != 0) {
171 info("error reading db file %s: %s", filename, strerror(errno));
176 while (cur < bufsize) {
177 count = buf_get_line(buf, bufsize, cur);
183 if (count > sizeof(udev->name))
184 count = sizeof(udev->name);
185 memcpy(udev->name, &bufline[2], count-2);
186 udev->name[count-2] = '\0';
189 if (count > sizeof(line))
190 count = sizeof(line);
191 memcpy(line, &bufline[2], count-2);
192 line[count-2] = '\0';
193 sscanf(line, "%u:%u", &maj, &min);
194 udev->devt = makedev(maj, min);
197 if (count > sizeof(line))
198 count = sizeof(line);
199 memcpy(line, &bufline[2], count-2);
200 line[count-2] = '\0';
201 name_list_add(&udev->symlink_list, line, 0);
204 if (count > sizeof(line))
205 count = sizeof(line);
206 memcpy(line, &bufline[2], count-2);
207 line[count-2] = '\0';
208 udev->link_priority = atoi(line);
211 if (count > sizeof(line))
212 count = sizeof(line);
213 memcpy(line, &bufline[2], count-2);
214 line[count-2] = '\0';
215 udev->partitions = atoi(line);
218 if (count > sizeof(line))
219 count = sizeof(line);
220 memcpy(line, &bufline[2], count-2);
221 line[count-2] = '\0';
222 udev->ignore_remove = atoi(line);
225 if (count > sizeof(line))
226 count = sizeof(line);
227 memcpy(line, &bufline[2], count-2);
228 line[count-2] = '\0';
229 name_list_add(&udev->env_list, line, 0);
233 file_unmap(buf, bufsize);
235 if (udev->name[0] == '\0')
241 int udev_db_delete_device(struct udevice *udev)
243 char filename[PATH_SIZE];
244 struct name_entry *name_loop;
246 devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename));
249 name_index(udev->dev->devpath, udev->name, 0);
250 list_for_each_entry(name_loop, &udev->symlink_list, node)
251 name_index(udev->dev->devpath, name_loop->name, 0);
256 int udev_db_lookup_name(const char *name, char *devpath, size_t len)
258 char dirname[PATH_MAX];
263 strlcpy(dirname, udev_root, sizeof(dirname));
264 start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname));
265 strlcat(dirname, name, sizeof(dirname));
266 path_encode(&dirname[start], sizeof(dirname) - start);
268 dir = opendir(dirname);
270 info("no index directory '%s': %s", dirname, strerror(errno));
274 info("found index directory '%s'", dirname);
277 char device[PATH_SIZE];
278 struct udevice *udev;
281 if (ent == NULL || ent->d_name[0] == '\0')
283 if (ent->d_name[0] == '.')
286 strlcpy(device, ent->d_name, sizeof(device));
288 udev = udev_device_init();
291 if (udev_db_get_device(udev, device) == 0) {
292 char filename[PATH_SIZE];
295 info("found db entry '%s'", device);
296 strlcpy(filename, udev_root, sizeof(filename));
297 strlcat(filename, "/", sizeof(filename));
298 strlcat(filename, name, sizeof(filename));
299 /* make sure device entry matches dev_t */
300 if (stat(filename, &statbuf) == 0) {
301 if (statbuf.st_rdev == udev->devt) {
302 info("node '%s' matches dev_t", udev->name);
303 strlcpy(devpath, device, len);
308 udev_device_cleanup(udev);
318 int udev_db_get_all_entries(struct list_head *name_list)
320 char dbpath[PATH_MAX];
323 strlcpy(dbpath, udev_root, sizeof(dbpath));
324 strlcat(dbpath, "/"DB_DIR, sizeof(dbpath));
325 dir = opendir(dbpath);
327 info("no udev_db available '%s': %s", dbpath, strerror(errno));
333 char device[PATH_SIZE];
336 if (ent == NULL || ent->d_name[0] == '\0')
338 if (ent->d_name[0] == '.')
341 strlcpy(device, ent->d_name, sizeof(device));
343 name_list_add(name_list, device, 1);
344 dbg("added '%s'", device);