2 #if defined(HAVE_CONFIG_H)
13 #include <sys/socket.h>
14 #include <sys/types.h>
18 #include <types/types.h>
19 #include <talloc/talloc.h>
20 #include <waiter/waiter.h>
21 #include <system/system.h>
22 #include <process/process.h>
26 #include "pb-discover.h"
27 #include "device-handler.h"
29 #include "devmapper.h"
31 /* We set a default monitor buffer size, as we may not process monitor
32 * events while performing device discvoery. systemd uses a 128M buffer, so
33 * we'll do the same here */
34 static const int monitor_bufsize = 128 * 1024 * 1024;
38 struct udev_monitor *monitor;
39 struct device_handler *handler;
42 static int udev_destructor(void *p)
44 struct pb_udev *udev = p;
47 udev_monitor_unref(udev->monitor);
52 udev_unref(udev->udev);
59 static void udev_setup_device_params(struct udev_device *udev,
60 struct discover_device *dev)
62 struct udev_list_entry *list, *entry;
64 list = udev_device_get_properties_list_entry(udev);
68 udev_list_entry_foreach(entry, list)
69 discover_device_set_param(dev,
70 udev_list_entry_get_name(entry),
71 udev_list_entry_get_value(entry));
75 * Search for LVM logical volumes. If any exist they should be recognised
77 * Normally this is handled in an init script, but on some platforms
78 * disks are slow enough to come up that we need to check again.
80 static void lvm_vg_search(struct device_handler *handler)
82 if (process_run_simple(handler, pb_system_apps.vgscan, "-qq", NULL))
83 pb_log("%s: Failed to execute vgscan\n", __func__);
85 if (process_run_simple(handler, pb_system_apps.vgchange, "-ay", "-qq",
87 pb_log("%s: Failed to execute vgchange\n", __func__);
90 static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
93 char *devlinks = NULL, *link, *saveptr = NULL;
94 struct discover_device *ddev;
103 const char *ignored_types[] = {
110 typestr = udev_device_get_devtype(dev);
112 pb_debug("udev_device_get_devtype failed\n");
116 if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
117 pb_log("SKIP %s: invalid type %s\n", name, typestr);
121 node = udev_device_get_devnode(dev);
122 path = udev_device_get_devpath(dev);
123 if (path && strstr(path, "virtual/block/loop")) {
124 pb_log("SKIP: %s: ignored (path=%s)\n", name, path);
128 if (path && strstr(path, "virtual/block/ram")) {
129 device_handler_add_ramdisk(udev->handler, node);
133 cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
135 /* CDROMs require a little initialisation, to get
136 * petitboot-compatible tray behaviour */
138 if (!cdrom_media_present(node)) {
139 pb_log("SKIP: %s: no media present\n", name);
144 /* Ignore any device mapper devices that aren't logical volumes */
145 devname = udev_device_get_property_value(dev, "DM_NAME");
146 if (devname && ! udev_device_get_property_value(dev, "DM_LV_NAME")) {
147 pb_debug("SKIP: dm-device %s\n", devname);
151 type = udev_device_get_property_value(dev, "ID_FS_TYPE");
153 pb_log("SKIP: %s: no ID_FS_TYPE property\n", name);
157 while (ignored_types[i]) {
158 if (!strncmp(type, ignored_types[i], strlen(ignored_types[i]))) {
159 pb_log("SKIP: %s: ignore '%s' filesystem\n", name, type);
165 /* Search for LVM logical volumes if we see an LVM member */
166 if (strncmp(type, "LVM2_member", strlen("LVM2_member")) == 0) {
167 lvm_vg_search(udev->handler);
171 /* We may see multipath devices; they'll have the same uuid as an
172 * existing device, so only parse the first. */
173 uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
175 ddev = device_lookup_by_uuid(udev->handler, uuid);
177 pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
178 name, uuid, ddev->device->id);
183 /* Use DM_NAME for logical volumes, or the device name otherwise */
184 ddev = discover_device_create(udev->handler, uuid, devname ?: name);
188 * For logical volumes udev_device_get_devnode() returns a path
189 * of the form "/dev/dm-xx". These nodes names are not
190 * persistent and are opaque to the user. Instead use the more
191 * recognisable "/dev/mapper/lv-name" node if it is available.
193 devlinks = talloc_strdup(ddev,
194 udev_device_get_property_value(dev, "DEVLINKS"));
195 link = devlinks ? strtok_r(devlinks, " ", &saveptr) : NULL;
197 if (strncmp(link, "/dev/mapper/",
198 strlen("/dev/mapper/")) == 0) {
202 link = strtok_r(NULL, " ", &saveptr);
206 ddev->device_path = talloc_strdup(ddev, node);
207 talloc_free(devlinks);
210 ddev->uuid = talloc_strdup(ddev, uuid);
211 prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
213 ddev->label = talloc_strdup(ddev, prop);
215 usb = !!udev_device_get_property_value(dev, "ID_USB_DRIVER");
217 ddev->device->type = DEVICE_TYPE_OPTICAL;
219 ddev->device->type = usb ? DEVICE_TYPE_USB : DEVICE_TYPE_DISK;
221 udev_setup_device_params(dev, ddev);
223 /* Create a snapshot for all disk devices */
224 if ((ddev->device->type == DEVICE_TYPE_DISK ||
225 ddev->device->type == DEVICE_TYPE_USB))
226 devmapper_init_snapshot(udev->handler, ddev);
228 device_handler_discover(udev->handler, ddev);
233 static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
238 name = udev_device_get_sysname(dev);
240 pb_debug("udev_device_get_sysname failed\n");
244 subsys = udev_device_get_subsystem(dev);
246 pb_debug("udev_device_get_subsystem failed\n");
250 if (device_lookup_by_id(udev->handler, name)) {
251 pb_debug("device %s is already present?\n", name);
255 if (!strcmp(subsys, "block")) {
256 return udev_handle_block_add(udev, dev, name);
259 pb_log("SKIP %s: unknown subsystem %s\n", name, subsys);
264 static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
266 struct discover_device *ddev;
269 name = udev_device_get_sysname(dev);
271 pb_debug("udev_device_get_sysname failed\n");
275 ddev = device_lookup_by_id(udev->handler, name);
279 device_handler_remove(udev->handler, ddev);
284 /* returns true if further event processing should stop (eg., we've
287 static bool udev_handle_cdrom_events(struct pb_udev *udev,
288 struct udev_device *dev, struct discover_device *ddev)
293 node = udev_device_get_devnode(dev);
295 /* handle CDROM eject requests */
296 if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
297 pb_debug("udev: eject request\n");
299 /* If the device is mounted, cdrom_id's own eject request may
300 * have failed. So, we'll need to do our own here.
303 eject = ddev->mounted;
304 udev_handle_dev_remove(udev, dev);
313 if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
314 if (cdrom_media_present(node))
315 udev_handle_dev_add(udev, dev);
317 udev_handle_dev_remove(udev, dev);
324 static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
326 struct discover_device *ddev;
330 name = udev_device_get_sysname(dev);
332 ddev = device_lookup_by_id(udev->handler, name);
334 /* if this is a CDROM device, process eject & media change requests;
335 * these may stop further processing */
336 if (!udev_device_get_property_value(dev, "ID_CDROM")) {
337 if (udev_handle_cdrom_events(udev, dev, ddev))
341 /* if this is a new device, treat it as an add */
343 rc = udev_handle_dev_add(udev, dev);
348 static int udev_handle_dev_action(struct udev_device *dev, const char *action)
350 struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
351 struct udev_list_entry *list;
354 list = udev_device_get_properties_list_entry(dev);
355 name = udev_device_get_sysname(dev);
357 pb_debug("udev: action %s, device %s\n", action, name);
358 pb_debug("udev: properties:\n");
360 for (; list; list = udev_list_entry_get_next(list))
361 pb_debug("\t%-20s: %s\n", udev_list_entry_get_name(list),
362 udev_list_entry_get_value(list));
364 if (!strcmp(action, "add"))
365 return udev_handle_dev_add(udev, dev);
367 else if (!strcmp(action, "remove"))
368 return udev_handle_dev_remove(udev, dev);
370 else if (!strcmp(action, "change"))
371 return udev_handle_dev_change(udev, dev);
376 static int udev_enumerate(struct udev *udev)
379 struct udev_list_entry *list, *entry;
380 struct udev_enumerate *enumerate;
382 enumerate = udev_enumerate_new(udev);
385 pb_log("udev_enumerate_new failed\n");
389 result = udev_enumerate_add_match_subsystem(enumerate, "block");
391 pb_log("udev_enumerate_add_match_subsystem failed\n");
395 result = udev_enumerate_add_match_is_initialized(enumerate);
397 pb_log("udev_enumerate_add_match_is_initialised failed\n");
401 udev_enumerate_scan_devices(enumerate);
403 list = udev_enumerate_get_list_entry(enumerate);
405 udev_list_entry_foreach(entry, list) {
407 struct udev_device *dev;
409 syspath = udev_list_entry_get_name(entry);
410 dev = udev_device_new_from_syspath(udev, syspath);
412 udev_handle_dev_action(dev, "add");
414 udev_device_unref(dev);
417 udev_enumerate_unref(enumerate);
421 udev_enumerate_unref(enumerate);
425 static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
428 struct udev_monitor *m;
431 m = udev_monitor_new_from_netlink(udev, "udev");
434 pb_log("udev_monitor_new_from_netlink failed\n");
438 result = udev_monitor_set_receive_buffer_size(m, monitor_bufsize);
440 pb_log("udev_monitor_set_rx_bufsize(%d) failed\n",
444 result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
448 pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
452 result = udev_monitor_enable_receiving(m);
455 pb_log("udev_monitor_enable_receiving failed\n");
463 udev_monitor_unref(m);
468 * udev_process - waiter callback for monitor netlink.
471 static int udev_process(void *arg)
473 struct udev_monitor *monitor = arg;
474 struct udev_device *dev;
477 dev = udev_monitor_receive_device(monitor);
479 pb_log("udev_monitor_receive_device failed\n");
483 action = udev_device_get_action(dev);
486 pb_log("udev_device_get_action failed\n");
488 udev_handle_dev_action(dev, action);
491 udev_device_unref(dev);
496 static void udev_log_fn(struct udev __attribute__((unused)) *udev,
497 int __attribute__((unused)) priority, const char *file, int line,
498 const char *fn, const char *format, va_list args)
500 pb_log("libudev: %s %s:%d: ", fn, file, line);
501 vfprintf(pb_log_get_stream(), format, args);
505 struct pb_udev *udev_init(struct device_handler *handler,
506 struct waitset *waitset)
508 struct pb_udev *udev;
511 udev = talloc_zero(handler, struct pb_udev);
512 talloc_set_destructor(udev, udev_destructor);
513 udev->handler = handler;
515 udev->udev = udev_new();
518 pb_log("udev_new failed\n");
522 udev_set_userdata(udev->udev, udev);
525 udev_set_log_fn(udev->udev, udev_log_fn);
528 result = udev_setup_monitor(udev->udev, &udev->monitor);
532 result = udev_enumerate(udev->udev);
536 waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
537 udev_process, udev->monitor);
539 pb_debug("%s: waiting on udev\n", __func__);
548 void udev_reinit(struct pb_udev *udev)
550 pb_log("udev: reinit requested, starting enumeration\n");
551 udev_enumerate(udev->udev);