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Commit | Line | Data |
---|---|---|
d7867b31 KS |
1 | /* |
2 | * compose persistent device path | |
3 | * | |
1298001e | 4 | * Copyright (C) 2009-2011 Kay Sievers <kay@vrfy.org> |
d7867b31 KS |
5 | * |
6 | * Logic based on Hannes Reinecke's shell script. | |
7 | * | |
8 | * This program is free software: you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation, either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
d7867b31 | 22 | #include <ctype.h> |
d7867b31 | 23 | #include <dirent.h> |
07630cea LP |
24 | #include <errno.h> |
25 | #include <fcntl.h> | |
d7867b31 | 26 | #include <getopt.h> |
07630cea LP |
27 | #include <stdarg.h> |
28 | #include <stdio.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
31 | #include <unistd.h> | |
d7867b31 | 32 | |
07630cea | 33 | #include "string-util.h" |
d7867b31 KS |
34 | #include "udev.h" |
35 | ||
9091e686 | 36 | _printf_(2,3) |
9ec6e95b | 37 | static int path_prepend(char **path, const char *fmt, ...) { |
912541b0 KS |
38 | va_list va; |
39 | char *pre; | |
40 | int err = 0; | |
41 | ||
42 | va_start(va, fmt); | |
43 | err = vasprintf(&pre, fmt, va); | |
44 | va_end(va); | |
45 | if (err < 0) | |
46 | goto out; | |
47 | ||
48 | if (*path != NULL) { | |
49 | char *new; | |
50 | ||
51 | err = asprintf(&new, "%s-%s", pre, *path); | |
52 | free(pre); | |
53 | if (err < 0) | |
54 | goto out; | |
55 | free(*path); | |
56 | *path = new; | |
57 | } else { | |
58 | *path = pre; | |
59 | } | |
d7867b31 | 60 | out: |
912541b0 | 61 | return err; |
d7867b31 KS |
62 | } |
63 | ||
64 | /* | |
65 | ** Linux only supports 32 bit luns. | |
66 | ** See drivers/scsi/scsi_scan.c::scsilun_to_int() for more details. | |
67 | */ | |
9ec6e95b | 68 | static int format_lun_number(struct udev_device *dev, char **path) { |
912541b0 | 69 | unsigned long lun = strtoul(udev_device_get_sysnum(dev), NULL, 10); |
d7867b31 | 70 | |
912541b0 KS |
71 | /* address method 0, peripheral device addressing with bus id of zero */ |
72 | if (lun < 256) | |
d9de321f | 73 | return path_prepend(path, "lun-%lu", lun); |
912541b0 | 74 | /* handle all other lun addressing methods by using a variant of the original lun format */ |
d9de321f | 75 | return path_prepend(path, "lun-0x%04lx%04lx00000000", lun & 0xffff, (lun >> 16) & 0xffff); |
d7867b31 KS |
76 | } |
77 | ||
9ec6e95b | 78 | static struct udev_device *skip_subsystem(struct udev_device *dev, const char *subsys) { |
912541b0 KS |
79 | struct udev_device *parent = dev; |
80 | ||
3b64e4d4 TG |
81 | assert(dev); |
82 | assert(subsys); | |
83 | ||
912541b0 KS |
84 | while (parent != NULL) { |
85 | const char *subsystem; | |
86 | ||
87 | subsystem = udev_device_get_subsystem(parent); | |
090be865 | 88 | if (subsystem == NULL || !streq(subsystem, subsys)) |
912541b0 KS |
89 | break; |
90 | dev = parent; | |
91 | parent = udev_device_get_parent(parent); | |
92 | } | |
93 | return dev; | |
d7867b31 KS |
94 | } |
95 | ||
9ec6e95b | 96 | static struct udev_device *handle_scsi_fibre_channel(struct udev_device *parent, char **path) { |
912541b0 KS |
97 | struct udev *udev = udev_device_get_udev(parent); |
98 | struct udev_device *targetdev; | |
99 | struct udev_device *fcdev = NULL; | |
100 | const char *port; | |
33b40551 | 101 | char *lun = NULL; |
912541b0 | 102 | |
3b64e4d4 TG |
103 | assert(parent); |
104 | assert(path); | |
105 | ||
912541b0 KS |
106 | targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target"); |
107 | if (targetdev == NULL) | |
108 | return NULL; | |
109 | ||
110 | fcdev = udev_device_new_from_subsystem_sysname(udev, "fc_transport", udev_device_get_sysname(targetdev)); | |
111 | if (fcdev == NULL) | |
112 | return NULL; | |
113 | port = udev_device_get_sysattr_value(fcdev, "port_name"); | |
114 | if (port == NULL) { | |
115 | parent = NULL; | |
116 | goto out; | |
117 | } | |
118 | ||
119 | format_lun_number(parent, &lun); | |
120 | path_prepend(path, "fc-%s-%s", port, lun); | |
dc4ebc07 | 121 | free(lun); |
d7867b31 | 122 | out: |
912541b0 KS |
123 | udev_device_unref(fcdev); |
124 | return parent; | |
d7867b31 KS |
125 | } |
126 | ||
66bba0e7 | 127 | static struct udev_device *handle_scsi_sas_wide_port(struct udev_device *parent, char **path) { |
912541b0 KS |
128 | struct udev *udev = udev_device_get_udev(parent); |
129 | struct udev_device *targetdev; | |
130 | struct udev_device *target_parent; | |
131 | struct udev_device *sasdev; | |
132 | const char *sas_address; | |
133 | char *lun = NULL; | |
134 | ||
3b64e4d4 TG |
135 | assert(parent); |
136 | assert(path); | |
137 | ||
912541b0 KS |
138 | targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target"); |
139 | if (targetdev == NULL) | |
140 | return NULL; | |
141 | ||
142 | target_parent = udev_device_get_parent(targetdev); | |
143 | if (target_parent == NULL) | |
144 | return NULL; | |
145 | ||
146 | sasdev = udev_device_new_from_subsystem_sysname(udev, "sas_device", | |
147 | udev_device_get_sysname(target_parent)); | |
148 | if (sasdev == NULL) | |
149 | return NULL; | |
150 | ||
151 | sas_address = udev_device_get_sysattr_value(sasdev, "sas_address"); | |
152 | if (sas_address == NULL) { | |
153 | parent = NULL; | |
154 | goto out; | |
155 | } | |
156 | ||
157 | format_lun_number(parent, &lun); | |
158 | path_prepend(path, "sas-%s-%s", sas_address, lun); | |
dc4ebc07 | 159 | free(lun); |
d7867b31 | 160 | out: |
912541b0 KS |
161 | udev_device_unref(sasdev); |
162 | return parent; | |
d7867b31 KS |
163 | } |
164 | ||
66bba0e7 ML |
165 | static struct udev_device *handle_scsi_sas(struct udev_device *parent, char **path) |
166 | { | |
167 | struct udev *udev = udev_device_get_udev(parent); | |
168 | struct udev_device *targetdev; | |
169 | struct udev_device *target_parent; | |
170 | struct udev_device *port; | |
171 | struct udev_device *expander; | |
172 | struct udev_device *target_sasdev = NULL; | |
173 | struct udev_device *expander_sasdev = NULL; | |
174 | struct udev_device *port_sasdev = NULL; | |
175 | const char *sas_address = NULL; | |
176 | const char *phy_id; | |
177 | const char *phy_count; | |
178 | char *lun = NULL; | |
179 | ||
3b64e4d4 TG |
180 | assert(parent); |
181 | assert(path); | |
182 | ||
66bba0e7 ML |
183 | targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target"); |
184 | if (targetdev == NULL) | |
185 | return NULL; | |
186 | ||
187 | target_parent = udev_device_get_parent(targetdev); | |
188 | if (target_parent == NULL) | |
189 | return NULL; | |
190 | ||
191 | /* Get sas device */ | |
192 | target_sasdev = udev_device_new_from_subsystem_sysname(udev, | |
193 | "sas_device", udev_device_get_sysname(target_parent)); | |
194 | if (target_sasdev == NULL) | |
195 | return NULL; | |
196 | ||
197 | /* The next parent is sas port */ | |
198 | port = udev_device_get_parent(target_parent); | |
199 | if (port == NULL) { | |
200 | parent = NULL; | |
201 | goto out; | |
202 | } | |
203 | ||
204 | /* Get port device */ | |
205 | port_sasdev = udev_device_new_from_subsystem_sysname(udev, | |
206 | "sas_port", udev_device_get_sysname(port)); | |
207 | ||
208 | phy_count = udev_device_get_sysattr_value(port_sasdev, "num_phys"); | |
209 | if (phy_count == NULL) { | |
210 | parent = NULL; | |
211 | goto out; | |
212 | } | |
213 | ||
214 | /* Check if we are simple disk */ | |
215 | if (strncmp(phy_count, "1", 2) != 0) { | |
216 | parent = handle_scsi_sas_wide_port(parent, path); | |
217 | goto out; | |
218 | } | |
219 | ||
220 | /* Get connected phy */ | |
221 | phy_id = udev_device_get_sysattr_value(target_sasdev, "phy_identifier"); | |
222 | if (phy_id == NULL) { | |
223 | parent = NULL; | |
224 | goto out; | |
225 | } | |
226 | ||
227 | /* The port's parent is either hba or expander */ | |
228 | expander = udev_device_get_parent(port); | |
229 | if (expander == NULL) { | |
230 | parent = NULL; | |
231 | goto out; | |
232 | } | |
233 | ||
234 | /* Get expander device */ | |
235 | expander_sasdev = udev_device_new_from_subsystem_sysname(udev, | |
236 | "sas_device", udev_device_get_sysname(expander)); | |
237 | if (expander_sasdev != NULL) { | |
238 | /* Get expander's address */ | |
239 | sas_address = udev_device_get_sysattr_value(expander_sasdev, | |
240 | "sas_address"); | |
241 | if (sas_address == NULL) { | |
242 | parent = NULL; | |
243 | goto out; | |
244 | } | |
245 | } | |
246 | ||
247 | format_lun_number(parent, &lun); | |
248 | if (sas_address) | |
249 | path_prepend(path, "sas-exp%s-phy%s-%s", sas_address, phy_id, lun); | |
250 | else | |
251 | path_prepend(path, "sas-phy%s-%s", phy_id, lun); | |
252 | ||
dc4ebc07 | 253 | free(lun); |
66bba0e7 ML |
254 | out: |
255 | udev_device_unref(target_sasdev); | |
256 | udev_device_unref(expander_sasdev); | |
257 | udev_device_unref(port_sasdev); | |
258 | return parent; | |
259 | } | |
260 | ||
9ec6e95b | 261 | static struct udev_device *handle_scsi_iscsi(struct udev_device *parent, char **path) { |
912541b0 KS |
262 | struct udev *udev = udev_device_get_udev(parent); |
263 | struct udev_device *transportdev; | |
264 | struct udev_device *sessiondev = NULL; | |
265 | const char *target; | |
266 | char *connname; | |
267 | struct udev_device *conndev = NULL; | |
268 | const char *addr; | |
269 | const char *port; | |
270 | char *lun = NULL; | |
271 | ||
3b64e4d4 TG |
272 | assert(parent); |
273 | assert(path); | |
274 | ||
912541b0 KS |
275 | /* find iscsi session */ |
276 | transportdev = parent; | |
277 | for (;;) { | |
278 | transportdev = udev_device_get_parent(transportdev); | |
279 | if (transportdev == NULL) | |
280 | return NULL; | |
33502ffe | 281 | if (startswith(udev_device_get_sysname(transportdev), "session")) |
912541b0 KS |
282 | break; |
283 | } | |
284 | ||
285 | /* find iscsi session device */ | |
286 | sessiondev = udev_device_new_from_subsystem_sysname(udev, "iscsi_session", udev_device_get_sysname(transportdev)); | |
287 | if (sessiondev == NULL) | |
288 | return NULL; | |
289 | target = udev_device_get_sysattr_value(sessiondev, "targetname"); | |
290 | if (target == NULL) { | |
291 | parent = NULL; | |
292 | goto out; | |
293 | } | |
294 | ||
295 | if (asprintf(&connname, "connection%s:0", udev_device_get_sysnum(transportdev)) < 0) { | |
296 | parent = NULL; | |
297 | goto out; | |
298 | } | |
299 | conndev = udev_device_new_from_subsystem_sysname(udev, "iscsi_connection", connname); | |
300 | free(connname); | |
301 | if (conndev == NULL) { | |
302 | parent = NULL; | |
303 | goto out; | |
304 | } | |
305 | addr = udev_device_get_sysattr_value(conndev, "persistent_address"); | |
306 | port = udev_device_get_sysattr_value(conndev, "persistent_port"); | |
307 | if (addr == NULL || port == NULL) { | |
308 | parent = NULL; | |
309 | goto out; | |
310 | } | |
311 | ||
312 | format_lun_number(parent, &lun); | |
313 | path_prepend(path, "ip-%s:%s-iscsi-%s-%s", addr, port, target, lun); | |
dc4ebc07 | 314 | free(lun); |
d7867b31 | 315 | out: |
912541b0 KS |
316 | udev_device_unref(sessiondev); |
317 | udev_device_unref(conndev); | |
318 | return parent; | |
d7867b31 KS |
319 | } |
320 | ||
ba86822d DM |
321 | static struct udev_device *handle_scsi_ata(struct udev_device *parent, char **path) { |
322 | struct udev *udev = udev_device_get_udev(parent); | |
323 | struct udev_device *targetdev; | |
324 | struct udev_device *target_parent; | |
325 | struct udev_device *atadev; | |
326 | const char *port_no; | |
327 | ||
328 | assert(parent); | |
329 | assert(path); | |
330 | ||
331 | targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host"); | |
332 | if (!targetdev) | |
333 | return NULL; | |
334 | ||
335 | target_parent = udev_device_get_parent(targetdev); | |
336 | if (!target_parent) | |
337 | return NULL; | |
338 | ||
339 | atadev = udev_device_new_from_subsystem_sysname(udev, "ata_port", udev_device_get_sysname(target_parent)); | |
340 | if (!atadev) | |
341 | return NULL; | |
342 | ||
343 | port_no = udev_device_get_sysattr_value(atadev, "port_no"); | |
344 | if (!port_no) { | |
345 | parent = NULL; | |
346 | goto out; | |
347 | } | |
348 | path_prepend(path, "ata-%s", port_no); | |
349 | out: | |
350 | udev_device_unref(atadev); | |
351 | return parent; | |
352 | } | |
353 | ||
9ec6e95b | 354 | static struct udev_device *handle_scsi_default(struct udev_device *parent, char **path) { |
912541b0 KS |
355 | struct udev_device *hostdev; |
356 | int host, bus, target, lun; | |
357 | const char *name; | |
358 | char *base; | |
359 | char *pos; | |
360 | DIR *dir; | |
361 | struct dirent *dent; | |
362 | int basenum; | |
363 | ||
3b64e4d4 TG |
364 | assert(parent); |
365 | assert(path); | |
366 | ||
912541b0 KS |
367 | hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host"); |
368 | if (hostdev == NULL) | |
369 | return NULL; | |
370 | ||
371 | name = udev_device_get_sysname(parent); | |
372 | if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) | |
373 | return NULL; | |
374 | ||
1c7dfbf2 KS |
375 | /* |
376 | * Rebase host offset to get the local relative number | |
377 | * | |
378 | * Note: This is by definition racy, unreliable and too simple. | |
379 | * Please do not copy this model anywhere. It's just a left-over | |
380 | * from the time we had no idea how things should look like in | |
381 | * the end. | |
382 | * | |
383 | * Making assumptions about a global in-kernel counter and use | |
384 | * that to calculate a local offset is a very broken concept. It | |
385 | * can only work as long as things are in strict order. | |
386 | * | |
387 | * The kernel needs to export the instance/port number of a | |
388 | * controller directly, without the need for rebase magic like | |
389 | * this. Manual driver unbind/bind, parallel hotplug/unplug will | |
390 | * get into the way of this "I hope it works" logic. | |
391 | */ | |
912541b0 KS |
392 | basenum = -1; |
393 | base = strdup(udev_device_get_syspath(hostdev)); | |
394 | if (base == NULL) | |
395 | return NULL; | |
396 | pos = strrchr(base, '/'); | |
397 | if (pos == NULL) { | |
398 | parent = NULL; | |
399 | goto out; | |
400 | } | |
401 | pos[0] = '\0'; | |
402 | dir = opendir(base); | |
403 | if (dir == NULL) { | |
404 | parent = NULL; | |
405 | goto out; | |
406 | } | |
407 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { | |
408 | char *rest; | |
409 | int i; | |
410 | ||
411 | if (dent->d_name[0] == '.') | |
412 | continue; | |
413 | if (dent->d_type != DT_DIR && dent->d_type != DT_LNK) | |
414 | continue; | |
33502ffe | 415 | if (!startswith(dent->d_name, "host")) |
912541b0 KS |
416 | continue; |
417 | i = strtoul(&dent->d_name[4], &rest, 10); | |
418 | if (rest[0] != '\0') | |
419 | continue; | |
746b5152 KS |
420 | /* |
421 | * find the smallest number; the host really needs to export its | |
422 | * own instance number per parent device; relying on the global host | |
423 | * enumeration and plainly rebasing the numbers sounds unreliable | |
424 | */ | |
912541b0 KS |
425 | if (basenum == -1 || i < basenum) |
426 | basenum = i; | |
427 | } | |
428 | closedir(dir); | |
429 | if (basenum == -1) { | |
430 | parent = NULL; | |
431 | goto out; | |
432 | } | |
433 | host -= basenum; | |
434 | ||
435 | path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun); | |
d7867b31 | 436 | out: |
912541b0 KS |
437 | free(base); |
438 | return hostdev; | |
d7867b31 KS |
439 | } |
440 | ||
a24d03b8 HR |
441 | static struct udev_device *handle_scsi_hyperv(struct udev_device *parent, char **path) { |
442 | struct udev_device *hostdev; | |
443 | struct udev_device *vmbusdev; | |
444 | const char *guid_str; | |
445 | char *lun = NULL; | |
446 | char guid[38]; | |
447 | size_t i, k; | |
448 | ||
3b64e4d4 TG |
449 | assert(parent); |
450 | assert(path); | |
451 | ||
a24d03b8 HR |
452 | hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host"); |
453 | if (!hostdev) | |
454 | return NULL; | |
455 | ||
456 | vmbusdev = udev_device_get_parent(hostdev); | |
457 | if (!vmbusdev) | |
458 | return NULL; | |
459 | ||
460 | guid_str = udev_device_get_sysattr_value(vmbusdev, "device_id"); | |
461 | if (!guid_str) | |
462 | return NULL; | |
463 | ||
464 | if (strlen(guid_str) < 37 || guid_str[0] != '{' || guid_str[36] != '}') | |
465 | return NULL; | |
466 | ||
467 | for (i = 1, k = 0; i < 36; i++) { | |
468 | if (guid_str[i] == '-') | |
469 | continue; | |
470 | guid[k++] = guid_str[i]; | |
471 | } | |
472 | guid[k] = '\0'; | |
473 | ||
474 | format_lun_number(parent, &lun); | |
475 | path_prepend(path, "vmbus-%s-%s", guid, lun); | |
476 | free(lun); | |
477 | return parent; | |
478 | } | |
479 | ||
cc821d02 | 480 | static struct udev_device *handle_scsi(struct udev_device *parent, char **path, bool *supported_parent) { |
912541b0 KS |
481 | const char *devtype; |
482 | const char *name; | |
483 | const char *id; | |
484 | ||
485 | devtype = udev_device_get_devtype(parent); | |
090be865 | 486 | if (devtype == NULL || !streq(devtype, "scsi_device")) |
912541b0 KS |
487 | return parent; |
488 | ||
489 | /* firewire */ | |
490 | id = udev_device_get_sysattr_value(parent, "ieee1394_id"); | |
491 | if (id != NULL) { | |
492 | parent = skip_subsystem(parent, "scsi"); | |
493 | path_prepend(path, "ieee1394-0x%s", id); | |
cc821d02 | 494 | *supported_parent = true; |
912541b0 KS |
495 | goto out; |
496 | } | |
497 | ||
59d86149 | 498 | /* scsi sysfs does not have a "subsystem" for the transport */ |
912541b0 KS |
499 | name = udev_device_get_syspath(parent); |
500 | ||
501 | if (strstr(name, "/rport-") != NULL) { | |
502 | parent = handle_scsi_fibre_channel(parent, path); | |
cc821d02 | 503 | *supported_parent = true; |
912541b0 KS |
504 | goto out; |
505 | } | |
506 | ||
507 | if (strstr(name, "/end_device-") != NULL) { | |
508 | parent = handle_scsi_sas(parent, path); | |
cc821d02 | 509 | *supported_parent = true; |
912541b0 KS |
510 | goto out; |
511 | } | |
512 | ||
513 | if (strstr(name, "/session") != NULL) { | |
514 | parent = handle_scsi_iscsi(parent, path); | |
cc821d02 | 515 | *supported_parent = true; |
912541b0 KS |
516 | goto out; |
517 | } | |
518 | ||
481dcf7c | 519 | if (strstr(name, "/ata") != NULL) { |
ba86822d | 520 | parent = handle_scsi_ata(parent, path); |
481dcf7c KS |
521 | goto out; |
522 | } | |
523 | ||
a24d03b8 HR |
524 | if (strstr(name, "/vmbus_") != NULL) { |
525 | parent = handle_scsi_hyperv(parent, path); | |
526 | goto out; | |
527 | } | |
528 | ||
912541b0 | 529 | parent = handle_scsi_default(parent, path); |
d7867b31 | 530 | out: |
912541b0 | 531 | return parent; |
d7867b31 KS |
532 | } |
533 | ||
9ec6e95b | 534 | static struct udev_device *handle_cciss(struct udev_device *parent, char **path) { |
68acb21d HR |
535 | const char *str; |
536 | unsigned int controller, disk; | |
537 | ||
538 | str = udev_device_get_sysname(parent); | |
539 | if (sscanf(str, "c%ud%u%*s", &controller, &disk) != 2) | |
540 | return NULL; | |
541 | ||
542 | path_prepend(path, "cciss-disk%u", disk); | |
543 | parent = skip_subsystem(parent, "cciss"); | |
544 | return parent; | |
545 | } | |
546 | ||
9ec6e95b | 547 | static void handle_scsi_tape(struct udev_device *dev, char **path) { |
912541b0 | 548 | const char *name; |
d7867b31 | 549 | |
912541b0 KS |
550 | /* must be the last device in the syspath */ |
551 | if (*path != NULL) | |
552 | return; | |
d7867b31 | 553 | |
912541b0 | 554 | name = udev_device_get_sysname(dev); |
33502ffe | 555 | if (startswith(name, "nst") && strchr("lma", name[3]) != NULL) |
912541b0 | 556 | path_prepend(path, "nst%c", name[3]); |
33502ffe | 557 | else if (startswith(name, "st") && strchr("lma", name[2]) != NULL) |
912541b0 | 558 | path_prepend(path, "st%c", name[2]); |
d7867b31 KS |
559 | } |
560 | ||
9ec6e95b | 561 | static struct udev_device *handle_usb(struct udev_device *parent, char **path) { |
912541b0 KS |
562 | const char *devtype; |
563 | const char *str; | |
564 | const char *port; | |
565 | ||
566 | devtype = udev_device_get_devtype(parent); | |
567 | if (devtype == NULL) | |
568 | return parent; | |
090be865 | 569 | if (!streq(devtype, "usb_interface") && !streq(devtype, "usb_device")) |
912541b0 KS |
570 | return parent; |
571 | ||
572 | str = udev_device_get_sysname(parent); | |
573 | port = strchr(str, '-'); | |
574 | if (port == NULL) | |
575 | return parent; | |
576 | port++; | |
577 | ||
578 | parent = skip_subsystem(parent, "usb"); | |
579 | path_prepend(path, "usb-0:%s", port); | |
580 | return parent; | |
d7867b31 KS |
581 | } |
582 | ||
9ec6e95b | 583 | static struct udev_device *handle_bcma(struct udev_device *parent, char **path) { |
89f17d4f TG |
584 | const char *sysname; |
585 | unsigned int core; | |
586 | ||
587 | sysname = udev_device_get_sysname(parent); | |
588 | if (sscanf(sysname, "bcma%*u:%u", &core) != 1) | |
589 | return NULL; | |
590 | ||
591 | path_prepend(path, "bcma-%u", core); | |
592 | return parent; | |
593 | } | |
594 | ||
9ec6e95b | 595 | static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path) { |
912541b0 KS |
596 | struct udev_device *scsi_dev; |
597 | ||
3b64e4d4 TG |
598 | assert(parent); |
599 | assert(dev); | |
600 | assert(path); | |
601 | ||
912541b0 KS |
602 | scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device"); |
603 | if (scsi_dev != NULL) { | |
604 | const char *wwpn; | |
605 | const char *lun; | |
606 | const char *hba_id; | |
607 | ||
608 | hba_id = udev_device_get_sysattr_value(scsi_dev, "hba_id"); | |
609 | wwpn = udev_device_get_sysattr_value(scsi_dev, "wwpn"); | |
610 | lun = udev_device_get_sysattr_value(scsi_dev, "fcp_lun"); | |
611 | if (hba_id != NULL && lun != NULL && wwpn != NULL) { | |
612 | path_prepend(path, "ccw-%s-zfcp-%s:%s", hba_id, wwpn, lun); | |
613 | goto out; | |
614 | } | |
615 | } | |
616 | ||
617 | path_prepend(path, "ccw-%s", udev_device_get_sysname(parent)); | |
d7867b31 | 618 | out: |
912541b0 KS |
619 | parent = skip_subsystem(parent, "ccw"); |
620 | return parent; | |
d7867b31 KS |
621 | } |
622 | ||
9ec6e95b | 623 | static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool test) { |
912541b0 KS |
624 | struct udev_device *parent; |
625 | char *path = NULL; | |
e98bbfd2 KS |
626 | bool supported_transport = false; |
627 | bool supported_parent = false; | |
912541b0 | 628 | |
3b64e4d4 TG |
629 | assert(dev); |
630 | ||
912541b0 KS |
631 | /* S390 ccw bus */ |
632 | parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL); | |
633 | if (parent != NULL) { | |
634 | handle_ccw(parent, dev, &path); | |
635 | goto out; | |
636 | } | |
637 | ||
638 | /* walk up the chain of devices and compose path */ | |
639 | parent = dev; | |
640 | while (parent != NULL) { | |
641 | const char *subsys; | |
642 | ||
643 | subsys = udev_device_get_subsystem(parent); | |
644 | if (subsys == NULL) { | |
645 | ; | |
090be865 | 646 | } else if (streq(subsys, "scsi_tape")) { |
912541b0 | 647 | handle_scsi_tape(parent, &path); |
090be865 | 648 | } else if (streq(subsys, "scsi")) { |
cc821d02 | 649 | parent = handle_scsi(parent, &path, &supported_parent); |
e98bbfd2 | 650 | supported_transport = true; |
090be865 | 651 | } else if (streq(subsys, "cciss")) { |
68acb21d | 652 | parent = handle_cciss(parent, &path); |
e98bbfd2 | 653 | supported_transport = true; |
090be865 | 654 | } else if (streq(subsys, "usb")) { |
912541b0 | 655 | parent = handle_usb(parent, &path); |
e98bbfd2 | 656 | supported_transport = true; |
89f17d4f TG |
657 | } else if (streq(subsys, "bcma")) { |
658 | parent = handle_bcma(parent, &path); | |
e98bbfd2 | 659 | supported_transport = true; |
090be865 | 660 | } else if (streq(subsys, "serio")) { |
912541b0 KS |
661 | path_prepend(&path, "serio-%s", udev_device_get_sysnum(parent)); |
662 | parent = skip_subsystem(parent, "serio"); | |
090be865 | 663 | } else if (streq(subsys, "pci")) { |
912541b0 KS |
664 | path_prepend(&path, "pci-%s", udev_device_get_sysname(parent)); |
665 | parent = skip_subsystem(parent, "pci"); | |
e98bbfd2 | 666 | supported_parent = true; |
090be865 | 667 | } else if (streq(subsys, "platform")) { |
912541b0 KS |
668 | path_prepend(&path, "platform-%s", udev_device_get_sysname(parent)); |
669 | parent = skip_subsystem(parent, "platform"); | |
e98bbfd2 KS |
670 | supported_transport = true; |
671 | supported_parent = true; | |
090be865 | 672 | } else if (streq(subsys, "acpi")) { |
912541b0 KS |
673 | path_prepend(&path, "acpi-%s", udev_device_get_sysname(parent)); |
674 | parent = skip_subsystem(parent, "acpi"); | |
e98bbfd2 | 675 | supported_parent = true; |
090be865 | 676 | } else if (streq(subsys, "xen")) { |
912541b0 KS |
677 | path_prepend(&path, "xen-%s", udev_device_get_sysname(parent)); |
678 | parent = skip_subsystem(parent, "xen"); | |
e98bbfd2 | 679 | supported_parent = true; |
090be865 | 680 | } else if (streq(subsys, "scm")) { |
4ecc1318 SO |
681 | path_prepend(&path, "scm-%s", udev_device_get_sysname(parent)); |
682 | parent = skip_subsystem(parent, "scm"); | |
e98bbfd2 KS |
683 | supported_transport = true; |
684 | supported_parent = true; | |
912541b0 KS |
685 | } |
686 | ||
28541a3d TG |
687 | if (parent) |
688 | parent = udev_device_get_parent(parent); | |
912541b0 | 689 | } |
7fdd367e KS |
690 | |
691 | /* | |
a42cdff1 KS |
692 | * Do not return devices with an unknown parent device type. They |
693 | * might produce conflicting IDs if the parent does not provide a | |
694 | * unique and predictable name. | |
7fdd367e | 695 | */ |
97b11eed DH |
696 | if (!supported_parent) |
697 | path = mfree(path); | |
e98bbfd2 KS |
698 | |
699 | /* | |
a42cdff1 KS |
700 | * Do not return block devices without a well-known transport. Some |
701 | * devices do not expose their buses and do not provide a unique | |
702 | * and predictable name that way. | |
e98bbfd2 | 703 | */ |
97b11eed DH |
704 | if (streq(udev_device_get_subsystem(dev), "block") && !supported_transport) |
705 | path = mfree(path); | |
7fdd367e | 706 | |
d7867b31 | 707 | out: |
912541b0 KS |
708 | if (path != NULL) { |
709 | char tag[UTIL_NAME_SIZE]; | |
710 | size_t i; | |
711 | const char *p; | |
712 | ||
713 | /* compose valid udev tag name */ | |
714 | for (p = path, i = 0; *p; p++) { | |
715 | if ((*p >= '0' && *p <= '9') || | |
716 | (*p >= 'A' && *p <= 'Z') || | |
717 | (*p >= 'a' && *p <= 'z') || | |
718 | *p == '-') { | |
719 | tag[i++] = *p; | |
720 | continue; | |
721 | } | |
722 | ||
723 | /* skip all leading '_' */ | |
724 | if (i == 0) | |
725 | continue; | |
726 | ||
727 | /* avoid second '_' */ | |
728 | if (tag[i-1] == '_') | |
729 | continue; | |
730 | ||
731 | tag[i++] = '_'; | |
732 | } | |
733 | /* strip trailing '_' */ | |
734 | while (i > 0 && tag[i-1] == '_') | |
735 | i--; | |
736 | tag[i] = '\0'; | |
737 | ||
738 | udev_builtin_add_property(dev, test, "ID_PATH", path); | |
739 | udev_builtin_add_property(dev, test, "ID_PATH_TAG", tag); | |
740 | free(path); | |
741 | return EXIT_SUCCESS; | |
742 | } | |
743 | return EXIT_FAILURE; | |
d7867b31 KS |
744 | } |
745 | ||
746 | const struct udev_builtin udev_builtin_path_id = { | |
912541b0 KS |
747 | .name = "path_id", |
748 | .cmd = builtin_path_id, | |
5ac0162c | 749 | .help = "Compose persistent device path", |
912541b0 | 750 | .run_once = true, |
d7867b31 | 751 | }; |