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_dev_add(struct pb_udev *udev, struct udev_device *dev)
65 struct discover_device *ddev;
74 name = udev_device_get_sysname(dev);
76 pb_debug("udev_device_get_sysname failed\n");
80 typestr = udev_device_get_devtype(dev);
82 pb_debug("udev_device_get_devtype failed\n");
86 if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
87 pb_debug("SKIP %s: invalid type %s\n", name, typestr);
91 node = udev_device_get_devnode(dev);
92 path = udev_device_get_devpath(dev);
93 if (path && (strstr(path, "virtual/block/loop")
94 || strstr(path, "virtual/block/ram"))) {
95 pb_debug("SKIP: %s: ignored (path=%s)\n", name, path);
99 cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
101 /* CDROMs require a little initialisation, to get
102 * petitboot-compatible tray behaviour */
104 if (!cdrom_media_present(node)) {
105 pb_debug("SKIP: %s: no media present\n", name);
110 /* We have enough info to create the device and start discovery */
111 ddev = device_lookup_by_id(udev->handler, name);
113 pb_debug("device %s is already present?\n", name);
117 /* We may see multipath devices; they'll have the same uuid as an
118 * existing device, so only parse the first. */
119 uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
121 ddev = device_lookup_by_uuid(udev->handler, uuid);
123 pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
124 name, uuid, ddev->device->id);
129 ddev = discover_device_create(udev->handler, name);
131 ddev->device_path = talloc_strdup(ddev, node);
134 ddev->uuid = talloc_strdup(ddev, uuid);
135 prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
137 ddev->label = talloc_strdup(ddev, prop);
138 ddev->device->type = cdrom ? DEVICE_TYPE_OPTICAL : DEVICE_TYPE_DISK;
140 udev_setup_device_params(dev, ddev);
142 device_handler_discover(udev->handler, ddev);
147 static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
149 struct discover_device *ddev;
152 name = udev_device_get_sysname(dev);
154 pb_debug("udev_device_get_sysname failed\n");
158 ddev = device_lookup_by_id(udev->handler, name);
162 device_handler_remove(udev->handler, ddev);
167 static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
169 struct discover_device *ddev;
170 const char *name, *node;
172 name = udev_device_get_sysname(dev);
173 node = udev_device_get_devnode(dev);
175 /* we're only interested in CDROM change events at present */
176 if (!udev_device_get_property_value(dev, "ID_CDROM"))
179 /* handle CDROM eject requests */
180 if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
183 pb_debug("udev: eject request\n");
185 /* If the device is mounted, cdrom_id's own eject request may
186 * have failed. So, we'll need to do our own here.
188 ddev = device_lookup_by_id(udev->handler, name);
190 eject = ddev->mounted;
191 udev_handle_dev_remove(udev, dev);
200 if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
201 if (cdrom_media_present(node))
202 return udev_handle_dev_add(udev, dev);
204 return udev_handle_dev_remove(udev, dev);
210 static int udev_handle_dev_action(struct udev_device *dev, const char *action)
212 struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
216 struct udev_list_entry *list;
219 list = udev_device_get_properties_list_entry(dev);
220 name = udev_device_get_sysname(dev);
222 pb_debug("%s: action %s, device %s\n", __func__, action, name);
223 pb_debug("%s properties:\n", __func__);
225 for (; list; list = udev_list_entry_get_next(list))
226 pb_log("\t%-20s: %s\n", udev_list_entry_get_name(list),
227 udev_list_entry_get_value(list));
231 if (!strcmp(action, "add"))
232 return udev_handle_dev_add(udev, dev);
234 else if (!strcmp(action, "remove"))
235 return udev_handle_dev_remove(udev, dev);
237 else if (!strcmp(action, "change"))
238 return udev_handle_dev_change(udev, dev);
243 static int udev_enumerate(struct udev *udev)
246 struct udev_list_entry *list, *entry;
247 struct udev_enumerate *enumerate;
249 enumerate = udev_enumerate_new(udev);
252 pb_log("udev_enumerate_new failed\n");
256 result = udev_enumerate_add_match_subsystem(enumerate, "block");
259 pb_log("udev_enumerate_add_match_subsystem failed\n");
263 udev_enumerate_scan_devices(enumerate);
265 list = udev_enumerate_get_list_entry(enumerate);
268 pb_log("udev_enumerate_get_list_entry failed\n");
272 udev_list_entry_foreach(entry, list) {
274 struct udev_device *dev;
276 syspath = udev_list_entry_get_name(entry);
277 dev = udev_device_new_from_syspath(udev, syspath);
279 udev_handle_dev_action(dev, "add");
281 udev_device_unref(dev);
284 udev_enumerate_unref(enumerate);
288 udev_enumerate_unref(enumerate);
292 static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
295 struct udev_monitor *m;
298 m = udev_monitor_new_from_netlink(udev, "udev");
301 pb_log("udev_monitor_new_from_netlink failed\n");
305 result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
309 pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
313 result = udev_monitor_enable_receiving(m);
316 pb_log("udev_monitor_enable_receiving failed\n");
324 udev_monitor_unref(m);
329 * udev_process - waiter callback for monitor netlink.
332 static int udev_process(void *arg)
334 struct udev_monitor *monitor = arg;
335 struct udev_device *dev;
339 dev = udev_monitor_receive_device(monitor);
342 pb_log("udev_monitor_receive_device failed\n");
346 action = udev_device_get_action(dev);
349 pb_log("udev_device_get_action failed\n");
353 result = udev_handle_dev_action(dev, action);
355 udev_device_unref(dev);
359 udev_device_unref(dev);
363 static void udev_log_fn(struct udev __attribute__((unused)) *udev,
364 int __attribute__((unused)) priority, const char *file, int line,
365 const char *fn, const char *format, va_list args)
367 pb_log("libudev: %s %s:%d: ", fn, file, line);
368 vfprintf(pb_log_get_stream(), format, args);
371 struct pb_udev *udev_init(struct waitset *waitset,
372 struct device_handler *handler)
375 struct pb_udev *udev = talloc(NULL, struct pb_udev);
377 talloc_set_destructor(udev, udev_destructor);
378 udev->handler = handler;
380 udev->udev = udev_new();
383 pb_log("udev_new failed\n");
387 udev_set_userdata(udev->udev, udev);
389 udev_set_log_fn(udev->udev, udev_log_fn);
391 result = udev_enumerate(udev->udev);
396 result = udev_setup_monitor(udev->udev, &udev->monitor);
401 waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
402 udev_process, udev->monitor);
404 pb_debug("%s: waiting on udev\n", __func__);
410 udev_unref(udev->udev);
416 void udev_destroy(struct pb_udev *udev)