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->partitions)
122 fprintf(f, "A:%u\n", udev->partitions);
123 if (udev->ignore_remove)
124 fprintf(f, "R:%u\n", udev->ignore_remove);
125 list_for_each_entry(name_loop, &udev->env_list, node)
126 fprintf(f, "E:%s\n", name_loop->name);
132 int udev_db_get_device(struct udevice *udev, const char *devpath)
135 char filename[PATH_SIZE];
136 char line[PATH_SIZE];
137 unsigned int maj, min;
144 strlcpy(udev->dev->devpath, devpath, sizeof(udev->dev->devpath));
145 devpath_to_db_path(devpath, filename, sizeof(filename));
147 if (lstat(filename, &stats) != 0) {
148 info("no db file to read %s: %s", filename, strerror(errno));
151 if ((stats.st_mode & S_IFMT) == S_IFLNK) {
152 char target[NAME_SIZE];
155 info("found a symlink as db file");
156 target_len = readlink(filename, target, sizeof(target));
158 target[target_len] = '\0';
160 info("error reading db link %s: %s", filename, strerror(errno));
163 dbg("db link points to '%s'", target);
164 strlcpy(udev->name, target, sizeof(udev->name));
168 if (file_map(filename, &buf, &bufsize) != 0) {
169 info("error reading db file %s: %s", filename, strerror(errno));
174 while (cur < bufsize) {
175 count = buf_get_line(buf, bufsize, cur);
181 if (count > sizeof(udev->name))
182 count = sizeof(udev->name);
183 memcpy(udev->name, &bufline[2], count-2);
184 udev->name[count-2] = '\0';
187 if (count > sizeof(line))
188 count = sizeof(line);
189 memcpy(line, &bufline[2], count-2);
190 line[count-2] = '\0';
191 sscanf(line, "%u:%u", &maj, &min);
192 udev->devt = makedev(maj, min);
195 if (count > sizeof(line))
196 count = sizeof(line);
197 memcpy(line, &bufline[2], count-2);
198 line[count-2] = '\0';
199 name_list_add(&udev->symlink_list, line, 0);
202 if (count > sizeof(line))
203 count = sizeof(line);
204 memcpy(line, &bufline[2], count-2);
205 line[count-2] = '\0';
206 udev->partitions = atoi(line);
209 if (count > sizeof(line))
210 count = sizeof(line);
211 memcpy(line, &bufline[2], count-2);
212 line[count-2] = '\0';
213 udev->ignore_remove = atoi(line);
216 if (count > sizeof(line))
217 count = sizeof(line);
218 memcpy(line, &bufline[2], count-2);
219 line[count-2] = '\0';
220 name_list_add(&udev->env_list, line, 0);
224 file_unmap(buf, bufsize);
226 if (udev->name[0] == '\0')
232 int udev_db_delete_device(struct udevice *udev)
234 char filename[PATH_SIZE];
235 struct name_entry *name_loop;
237 devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename));
240 name_index(udev->dev->devpath, udev->name, 0);
241 list_for_each_entry(name_loop, &udev->symlink_list, node)
242 name_index(udev->dev->devpath, name_loop->name, 0);
247 int udev_db_lookup_name(const char *name, char *devpath, size_t len)
249 char dirname[PATH_MAX];
254 strlcpy(dirname, udev_root, sizeof(dirname));
255 start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname));
256 strlcat(dirname, name, sizeof(dirname));
257 path_encode(&dirname[start], sizeof(dirname) - start);
259 dir = opendir(dirname);
261 info("no index directory '%s': %s", dirname, strerror(errno));
265 info("found index directory '%s'", dirname);
268 char device[PATH_SIZE];
269 char filename[PATH_SIZE];
273 if (ent == NULL || ent->d_name[0] == '\0')
275 if (ent->d_name[0] == '.')
278 strlcpy(device, ent->d_name, sizeof(device));
281 dbg("looking at '%s'", device);
282 strlcpy(filename, sysfs_path, sizeof(filename));
283 strlcat(filename, device, sizeof(filename));
284 if (stat(filename, &statbuf) == 0) {
285 strlcpy(devpath, device, len);
298 int udev_db_get_all_entries(struct list_head *name_list)
300 char dbpath[PATH_MAX];
303 strlcpy(dbpath, udev_root, sizeof(dbpath));
304 strlcat(dbpath, "/"DB_DIR, sizeof(dbpath));
305 dir = opendir(dbpath);
307 info("no udev_db available '%s': %s", dbpath, strerror(errno));
313 char device[PATH_SIZE];
316 if (ent == NULL || ent->d_name[0] == '\0')
318 if (ent->d_name[0] == '.')
321 strlcpy(device, ent->d_name, sizeof(device));
323 name_list_add(name_list, device, 1);
324 dbg("added '%s'", device);