2 * compose persisistent device path
4 * Copyright (C) 2009 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
31 #include <../../udev/lib/libudev.h>
32 #include <../../udev/udev.h>
36 static void log_fn(struct udev *udev, int priority,
37 const char *file, int line, const char *fn,
38 const char *format, va_list args)
41 fprintf(stderr, "%s: ", fn != NULL ? fn : file);
42 vfprintf(stderr, format, args);
44 vsyslog(priority, format, args);
48 static int path_prepend(char **path, const char *fmt, ...)
58 err = vasprintf(&pre, fmt, va);
64 err = asprintf(path, "%s-%s", pre, old);
76 static struct udev_device *skip_subsystem(struct udev_device *dev, const char *subsys)
78 struct udev_device *parent = dev;
80 while (parent != NULL) {
81 const char *subsystem;
83 subsystem = udev_device_get_subsystem(parent);
84 if (subsystem == NULL || strcmp(subsystem, subsys) != 0)
87 parent = udev_device_get_parent(parent);
92 /* find smallest number of instances of <syspath>/<name><number> */
93 static int base_number(const char *syspath, const char *name)
102 base = strdup(syspath);
106 pos = strrchr(base, '/');
115 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
119 if (dent->d_name[0] == '.')
121 if (dent->d_type != DT_DIR && dent->d_type != DT_LNK)
123 if (strncmp(dent->d_name, name, len) != 0)
125 i = strtoul(&dent->d_name[len], &rest, 10);
128 if (number == -1 || i < number)
137 static struct udev_device *handle_fc(struct udev_device *parent, char **path)
139 struct udev *udev = udev_device_get_udev(parent);
140 struct udev_device *targetdev = NULL;
141 char *syspath = NULL;
142 struct udev_device *fcdev;
146 targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
147 if (targetdev == NULL) {
152 if (asprintf(&syspath, "%s/fc_transport/%s", udev_device_get_syspath(targetdev), udev_device_get_sysname(targetdev)) < 0) {
156 fcdev = udev_device_new_from_syspath(udev, syspath);
162 port = udev_device_get_sysattr_value(fcdev, "port_name");
168 lun = strtoul(udev_device_get_sysnum(parent), NULL, 10);
169 path_prepend(path, "fc-%s:0x%04x%04x00000000", port, lun & 0xffff, (lun >> 16) & 0xffff);
172 udev_device_unref(fcdev);
176 static struct udev_device *handle_sas(struct udev_device *parent, char **path)
178 path_prepend(path, "sas-PATH_ID_NOT_IMPLEMENTED");
182 static struct udev_device *handle_iscsi(struct udev_device *parent, char **path)
184 path_prepend(path, "ip-PATH_ID_NOT_IMPLEMENTED");
188 static struct udev_device *handle_scsi(struct udev_device *parent, char **path)
190 struct udev_device *hostdev;
191 int host, bus, target, lun;
195 hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
199 name = udev_device_get_sysname(parent);
200 if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
203 /* rebase host offset to get the local relative number */
204 base = base_number(udev_device_get_syspath(hostdev), "host");
209 path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun);
213 static struct udev_device *handle_scsi_lun(struct udev_device *parent, char **path)
219 devtype = udev_device_get_devtype(parent);
220 if (devtype == NULL || strcmp(devtype, "scsi_device") != 0)
224 id = udev_device_get_sysattr_value(parent, "ieee1394_id");
226 parent = skip_subsystem(parent, "scsi");
227 path_prepend(path, "ieee1394-0x%s", id);
231 name = udev_device_get_syspath(parent);
234 if (strstr(name, "/rport-") != NULL) {
235 parent = handle_fc(parent, path);
240 if (strstr(name, "/end_device-") != NULL) {
241 parent = handle_sas(parent, path);
246 if (strstr(name, "/session") != NULL) {
247 parent = handle_iscsi(parent, path);
252 parent = handle_scsi(parent, path);
257 static void handle_scsi_tape(struct udev_device *dev, char **suffix)
261 name = udev_device_get_sysname(dev);
262 if (strncmp(name, "nst", 3) == 0 && strchr("lma", name[3]) != NULL)
263 asprintf(suffix, "nst%c", name[3]);
264 else if (strncmp(name, "st", 2) == 0 && strchr("lma", name[2]) != NULL)
265 asprintf(suffix, "st%c", name[2]);
268 static struct udev_device *handle_usb(struct udev_device *parent, char **path)
274 devtype = udev_device_get_devtype(parent);
275 if (devtype == NULL || strcmp(devtype, "usb_interface") != 0)
278 str = udev_device_get_sysname(parent);
279 port = strchr(str, '-');
284 parent = skip_subsystem(parent, "usb");
285 path_prepend(path, "usb-0:%s", port);
289 static struct udev_device *handle_cciss(struct udev_device *parent, char **path)
291 path_prepend(path, "cciss-PATH_ID_NOT_IMPLEMENTED");
295 static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path)
297 struct udev_device *scsi_dev;
299 scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device");
300 if (scsi_dev != NULL) {
305 hba_id = udev_device_get_sysattr_value(scsi_dev, "hba_id");
306 wwpn = udev_device_get_sysattr_value(scsi_dev, "wwpn");
307 lun = udev_device_get_sysattr_value(scsi_dev, "fcp_lun");
308 if (hba_id != NULL && lun != NULL && wwpn != NULL) {
309 path_prepend(path, "ccw-%s-zfcp-%s:%s", hba_id, wwpn, lun);
314 path_prepend(path, "ccw-%s", udev_device_get_sysname(parent));
316 parent = skip_subsystem(parent, "ccw");
320 int main(int argc, char **argv)
322 static const struct option options[] = {
323 { "debug", no_argument, NULL, 'd' },
324 { "help", no_argument, NULL, 'h' },
328 struct udev_device *dev;
329 struct udev_device *parent;
330 char syspath[UTIL_PATH_SIZE];
340 logging_init("usb_id");
341 udev_set_log_fn(udev, log_fn);
346 option = getopt_long(argc, argv, "dh", options, NULL);
353 if (udev_get_log_priority(udev) < LOG_INFO)
354 udev_set_log_priority(udev, LOG_INFO);
357 printf("Usage: path_id [--debug] [--help] <devpath>\n"
358 " --debug print debug information\n"
359 " --help print this help text\n\n");
366 devpath = argv[optind];
367 if (devpath == NULL) {
368 fprintf(stderr, "No device specified\n");
373 util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
374 dev = udev_device_new_from_syspath(udev, syspath);
376 fprintf(stderr, "unable to access '%s'\n", devpath);
385 parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL);
386 if (parent != NULL) {
387 handle_ccw(parent, dev, &path);
391 /* walk up the chain of devices and compose path */
393 while (parent != NULL) {
396 subsys = udev_device_get_subsystem(parent);
398 if (subsys == NULL) {
400 } else if (strcmp(subsys, "scsi_tape") == 0) {
401 handle_scsi_tape(parent, &path_suffix);
402 } else if (strcmp(subsys, "scsi") == 0) {
403 parent = handle_scsi_lun(parent, &path);
404 } else if (strcmp(subsys, "cciss") == 0) {
405 handle_cciss(parent, &path);
406 } else if (strcmp(subsys, "usb") == 0) {
407 parent = handle_usb(parent, &path);
408 } else if (strcmp(subsys, "serio") == 0) {
409 path_prepend(&path, "serio-%s", udev_device_get_sysnum(parent));
410 parent = skip_subsystem(parent, "serio");
411 } else if (strcmp(subsys, "pci") == 0) {
412 path_prepend(&path, "pci-%s", udev_device_get_sysname(parent));
413 parent = skip_subsystem(parent, "pci");
414 } else if (strcmp(subsys, "platform") == 0) {
415 path_prepend(&path, "platform-%s", udev_device_get_sysname(parent));
416 parent = skip_subsystem(parent, "platform");
417 } else if (strcmp(subsys, "xen") == 0) {
418 path_prepend(&path, "xen-%s", udev_device_get_sysname(parent));
419 parent = skip_subsystem(parent, "xen");
422 parent = udev_device_get_parent(parent);
426 if (path_suffix != NULL) {
427 printf("ID_PATH=%s%s\n", path, path_suffix);
430 printf("ID_PATH=%s\n", path);
436 udev_device_unref(dev);