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>
25 #include "pb-discover.h"
26 #include "device-handler.h"
31 struct udev_monitor *monitor;
32 struct device_handler *handler;
35 static int udev_destructor(void *p)
37 struct pb_udev *udev = p;
39 udev_monitor_unref(udev->monitor);
42 udev_unref(udev->udev);
48 static void udev_setup_device_params(struct udev_device *udev,
49 struct discover_device *dev)
51 struct udev_list_entry *list, *entry;
53 list = udev_device_get_properties_list_entry(udev);
57 udev_list_entry_foreach(entry, list)
58 discover_device_set_param(dev,
59 udev_list_entry_get_name(entry),
60 udev_list_entry_get_value(entry));
63 static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
66 struct discover_device *ddev;
74 typestr = udev_device_get_devtype(dev);
76 pb_debug("udev_device_get_devtype failed\n");
80 if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
81 pb_debug("SKIP %s: invalid type %s\n", name, typestr);
85 node = udev_device_get_devnode(dev);
86 path = udev_device_get_devpath(dev);
87 if (path && (strstr(path, "virtual/block/loop")
88 || strstr(path, "virtual/block/ram"))) {
89 pb_debug("SKIP: %s: ignored (path=%s)\n", name, path);
93 cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
95 /* CDROMs require a little initialisation, to get
96 * petitboot-compatible tray behaviour */
98 if (!cdrom_media_present(node)) {
99 pb_debug("SKIP: %s: no media present\n", name);
105 /* We may see multipath devices; they'll have the same uuid as an
106 * existing device, so only parse the first. */
107 uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
109 ddev = device_lookup_by_uuid(udev->handler, uuid);
111 pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
112 name, uuid, ddev->device->id);
117 ddev = discover_device_create(udev->handler, name);
119 ddev->device_path = talloc_strdup(ddev, node);
122 ddev->uuid = talloc_strdup(ddev, uuid);
123 prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
125 ddev->label = talloc_strdup(ddev, prop);
126 ddev->device->type = cdrom ? DEVICE_TYPE_OPTICAL : DEVICE_TYPE_DISK;
128 udev_setup_device_params(dev, ddev);
130 device_handler_discover(udev->handler, ddev);
135 static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
140 name = udev_device_get_sysname(dev);
142 pb_debug("udev_device_get_sysname failed\n");
146 subsys = udev_device_get_subsystem(dev);
148 pb_debug("udev_device_get_subsystem failed\n");
152 if (device_lookup_by_id(udev->handler, name)) {
153 pb_debug("device %s is already present?\n", name);
157 if (!strcmp(subsys, "block")) {
158 return udev_handle_block_add(udev, dev, name);
161 pb_debug("SKIP %s: unknown subsystem %s\n", name, subsys);
166 static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
168 struct discover_device *ddev;
171 name = udev_device_get_sysname(dev);
173 pb_debug("udev_device_get_sysname failed\n");
177 ddev = device_lookup_by_id(udev->handler, name);
181 device_handler_remove(udev->handler, ddev);
186 static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
188 struct discover_device *ddev;
189 const char *name, *node;
191 name = udev_device_get_sysname(dev);
192 node = udev_device_get_devnode(dev);
194 /* we're only interested in CDROM change events at present */
195 if (!udev_device_get_property_value(dev, "ID_CDROM"))
198 /* handle CDROM eject requests */
199 if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
202 pb_debug("udev: eject request\n");
204 /* If the device is mounted, cdrom_id's own eject request may
205 * have failed. So, we'll need to do our own here.
207 ddev = device_lookup_by_id(udev->handler, name);
209 eject = ddev->mounted;
210 udev_handle_dev_remove(udev, dev);
219 if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
220 if (cdrom_media_present(node))
221 return udev_handle_dev_add(udev, dev);
223 return udev_handle_dev_remove(udev, dev);
229 static int udev_handle_dev_action(struct udev_device *dev, const char *action)
231 struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
235 struct udev_list_entry *list;
238 list = udev_device_get_properties_list_entry(dev);
239 name = udev_device_get_sysname(dev);
241 pb_debug("%s: action %s, device %s\n", __func__, action, name);
242 pb_debug("%s properties:\n", __func__);
244 for (; list; list = udev_list_entry_get_next(list))
245 pb_log("\t%-20s: %s\n", udev_list_entry_get_name(list),
246 udev_list_entry_get_value(list));
250 if (!strcmp(action, "add"))
251 return udev_handle_dev_add(udev, dev);
253 else if (!strcmp(action, "remove"))
254 return udev_handle_dev_remove(udev, dev);
256 else if (!strcmp(action, "change"))
257 return udev_handle_dev_change(udev, dev);
262 static int udev_enumerate(struct udev *udev)
265 struct udev_list_entry *list, *entry;
266 struct udev_enumerate *enumerate;
268 enumerate = udev_enumerate_new(udev);
271 pb_log("udev_enumerate_new failed\n");
275 result = udev_enumerate_add_match_subsystem(enumerate, "block");
278 pb_log("udev_enumerate_add_match_subsystem failed\n");
282 udev_enumerate_scan_devices(enumerate);
284 list = udev_enumerate_get_list_entry(enumerate);
287 pb_log("udev_enumerate_get_list_entry failed\n");
291 udev_list_entry_foreach(entry, list) {
293 struct udev_device *dev;
295 syspath = udev_list_entry_get_name(entry);
296 dev = udev_device_new_from_syspath(udev, syspath);
298 udev_handle_dev_action(dev, "add");
300 udev_device_unref(dev);
303 udev_enumerate_unref(enumerate);
307 udev_enumerate_unref(enumerate);
311 static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
314 struct udev_monitor *m;
317 m = udev_monitor_new_from_netlink(udev, "udev");
320 pb_log("udev_monitor_new_from_netlink failed\n");
324 result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
328 pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
332 result = udev_monitor_enable_receiving(m);
335 pb_log("udev_monitor_enable_receiving failed\n");
343 udev_monitor_unref(m);
348 * udev_process - waiter callback for monitor netlink.
351 static int udev_process(void *arg)
353 struct udev_monitor *monitor = arg;
354 struct udev_device *dev;
358 dev = udev_monitor_receive_device(monitor);
361 pb_log("udev_monitor_receive_device failed\n");
365 action = udev_device_get_action(dev);
368 pb_log("udev_device_get_action failed\n");
372 result = udev_handle_dev_action(dev, action);
374 udev_device_unref(dev);
378 udev_device_unref(dev);
382 static void udev_log_fn(struct udev __attribute__((unused)) *udev,
383 int __attribute__((unused)) priority, const char *file, int line,
384 const char *fn, const char *format, va_list args)
386 pb_log("libudev: %s %s:%d: ", fn, file, line);
387 vfprintf(pb_log_get_stream(), format, args);
390 struct pb_udev *udev_init(struct waitset *waitset,
391 struct device_handler *handler)
394 struct pb_udev *udev = talloc(NULL, struct pb_udev);
396 talloc_set_destructor(udev, udev_destructor);
397 udev->handler = handler;
399 udev->udev = udev_new();
402 pb_log("udev_new failed\n");
406 udev_set_userdata(udev->udev, udev);
408 udev_set_log_fn(udev->udev, udev_log_fn);
410 result = udev_enumerate(udev->udev);
415 result = udev_setup_monitor(udev->udev, &udev->monitor);
420 waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
421 udev_process, udev->monitor);
423 pb_debug("%s: waiting on udev\n", __func__);
429 udev_unref(udev->udev);
435 void udev_destroy(struct pb_udev *udev)