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>
35 static size_t devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len)
39 /* translate to location of db file */
40 strlcpy(filename, udev_get_dev_path(udev), len);
41 start = strlcat(filename, "/.udev/db/", len);
42 strlcat(filename, devpath, len);
43 return path_encode(&filename[start], len - start);
46 /* reverse mapping from the device file name to the devpath */
47 static int name_index(struct udev *udev, const char *devpath, const char *name, int add)
49 char device[PATH_SIZE];
50 char filename[PATH_SIZE * 2];
54 /* directory with device name */
55 strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
56 start = strlcat(filename, "/.udev/names/", sizeof(filename));
57 strlcat(filename, name, sizeof(filename));
58 path_encode(&filename[start], sizeof(filename) - start);
59 /* entry with the devpath */
60 strlcpy(device, devpath, sizeof(device));
61 path_encode(device, sizeof(device));
62 strlcat(filename, "/", sizeof(filename));
63 strlcat(filename, device, sizeof(filename));
66 info(udev, "creating index: '%s'\n", filename);
67 create_path(udev, filename);
68 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
72 info(udev, "removing index: '%s'\n", filename);
74 delete_path(udev, filename);
79 int udev_db_get_devices_by_name(struct udev *udev, const char *name, struct list_head *name_list)
81 char dirname[PATH_MAX];
86 strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
87 start = strlcat(dirname, "/.udev/names/", sizeof(dirname));
88 strlcat(dirname, name, sizeof(dirname));
89 path_encode(&dirname[start], sizeof(dirname) - start);
91 dir = opendir(dirname);
93 info(udev, "no index directory '%s': %s\n", dirname, strerror(errno));
98 info(udev, "found index directory '%s'\n", dirname);
101 char device[PATH_SIZE];
104 if (ent == NULL || ent->d_name[0] == '\0')
106 if (ent->d_name[0] == '.')
109 strlcpy(device, ent->d_name, sizeof(device));
111 name_list_add(udev, name_list, device, 0);
119 int udev_db_rename(struct udev *udev, const char *devpath_old, const char *devpath)
121 char filename[PATH_SIZE];
122 char filename_old[PATH_SIZE];
124 devpath_to_db_path(udev, devpath_old, filename_old, sizeof(filename_old));
125 devpath_to_db_path(udev, devpath, filename, sizeof(filename));
126 return rename(filename_old, filename);
129 int udev_db_add_device(struct udevice *udevice)
131 char filename[PATH_SIZE];
133 if (udevice->test_run)
136 devpath_to_db_path(udevice->udev, udevice->dev->devpath, filename, sizeof(filename));
137 create_path(udevice->udev, filename);
141 * don't waste tmpfs memory pages, if we don't have any data to store
142 * create fake db-file; store the node-name in a symlink target
144 if (list_empty(&udevice->symlink_list) && list_empty(&udevice->env_list) &&
145 !udevice->partitions && !udevice->ignore_remove) {
147 dbg(udevice->udev, "nothing interesting to store, create symlink\n");
148 udev_selinux_setfscreatecon(udevice->udev, filename, S_IFLNK);
149 ret = symlink(udevice->name, filename);
150 udev_selinux_resetfscreatecon(udevice->udev);
152 err(udevice->udev, "unable to create db link '%s': %s\n", filename, strerror(errno));
157 struct name_entry *name_loop;
159 f = fopen(filename, "w");
161 err(udevice->udev, "unable to create db file '%s': %s\n", filename, strerror(errno));
164 dbg(udevice->udev, "storing data for device '%s' in '%s'\n", udevice->dev->devpath, filename);
166 fprintf(f, "N:%s\n", udevice->name);
167 list_for_each_entry(name_loop, &udevice->symlink_list, node) {
168 fprintf(f, "S:%s\n", name_loop->name);
169 /* add symlink-name to index */
170 name_index(udevice->udev, udevice->dev->devpath, name_loop->name, 1);
172 fprintf(f, "M:%u:%u\n", major(udevice->devt), minor(udevice->devt));
173 if (udevice->link_priority != 0)
174 fprintf(f, "L:%u\n", udevice->link_priority);
175 if (udevice->event_timeout >= 0)
176 fprintf(f, "T:%u\n", udevice->event_timeout);
177 if (udevice->partitions != 0)
178 fprintf(f, "A:%u\n", udevice->partitions);
179 if (udevice->ignore_remove)
180 fprintf(f, "R:%u\n", udevice->ignore_remove);
181 list_for_each_entry(name_loop, &udevice->env_list, node)
182 fprintf(f, "E:%s\n", name_loop->name);
186 /* add name to index */
187 name_index(udevice->udev, udevice->dev->devpath, udevice->name, 1);
192 int udev_db_get_device(struct udevice *udevice, const char *devpath)
195 char filename[PATH_SIZE];
196 char line[PATH_SIZE];
197 unsigned int maj, min;
204 sysfs_device_set_values(udevice->udev, udevice->dev, devpath, NULL, NULL);
205 devpath_to_db_path(udevice->udev, devpath, filename, sizeof(filename));
207 if (lstat(filename, &stats) != 0) {
208 info(udevice->udev, "no db file to read %s: %s\n", filename, strerror(errno));
211 if ((stats.st_mode & S_IFMT) == S_IFLNK) {
212 char target[NAME_SIZE];
215 info(udevice->udev, "found a symlink as db file\n");
216 target_len = readlink(filename, target, sizeof(target));
218 target[target_len] = '\0';
220 info(udevice->udev, "error reading db link %s: %s\n", filename, strerror(errno));
223 dbg(udevice->udev, "db link points to '%s'\n", target);
224 strlcpy(udevice->name, target, sizeof(udevice->name));
228 if (file_map(filename, &buf, &bufsize) != 0) {
229 info(udevice->udev, "error reading db file %s: %s\n", filename, strerror(errno));
234 while (cur < bufsize) {
235 count = buf_get_line(buf, bufsize, cur);
239 if (count > sizeof(line))
240 count = sizeof(line);
241 memcpy(line, &bufline[2], count-2);
242 line[count-2] = '\0';
246 strlcpy(udevice->name, line, sizeof(udevice->name));
249 sscanf(line, "%u:%u", &maj, &min);
250 udevice->devt = makedev(maj, min);
253 name_list_add(udevice->udev, &udevice->symlink_list, line, 0);
256 udevice->link_priority = atoi(line);
259 udevice->event_timeout = atoi(line);
262 udevice->partitions = atoi(line);
265 udevice->ignore_remove = atoi(line);
268 name_list_add(udevice->udev, &udevice->env_list, line, 0);
272 file_unmap(buf, bufsize);
274 if (udevice->name[0] == '\0')
280 int udev_db_delete_device(struct udevice *udevice)
282 char filename[PATH_SIZE];
283 struct name_entry *name_loop;
285 if (udevice->test_run)
288 devpath_to_db_path(udevice->udev, udevice->dev->devpath, filename, sizeof(filename));
291 name_index(udevice->udev, udevice->dev->devpath, udevice->name, 0);
292 list_for_each_entry(name_loop, &udevice->symlink_list, node)
293 name_index(udevice->udev, udevice->dev->devpath, name_loop->name, 0);
298 int udev_db_get_all_entries(struct udev *udev, struct list_head *name_list)
300 char dbpath[PATH_MAX];
303 strlcpy(dbpath, udev_get_dev_path(udev), sizeof(dbpath));
304 strlcat(dbpath, "/.udev/db", sizeof(dbpath));
305 dir = opendir(dbpath);
307 info(udev, "no udev_db available '%s': %s\n", 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(udev, name_list, device, 1);
324 dbg(udev, "added '%s'\n", device);