11 #include <sys/socket.h>
12 #include <sys/types.h>
16 #include <types/types.h>
17 #include <talloc/talloc.h>
18 #include <waiter/waiter.h>
19 #include <system/system.h>
23 #include "pb-discover.h"
24 #include "device-handler.h"
29 struct udev_monitor *monitor;
30 struct device_handler *handler;
33 static int udev_destructor(void *p)
35 struct pb_udev *udev = p;
37 udev_monitor_unref(udev->monitor);
40 udev_unref(udev->udev);
46 static void udev_setup_device_params(struct udev_device *udev,
47 struct discover_device *dev)
49 struct udev_list_entry *list, *entry;
51 list = udev_device_get_properties_list_entry(udev);
55 udev_list_entry_foreach(entry, list)
56 discover_device_set_param(dev,
57 udev_list_entry_get_name(entry),
58 udev_list_entry_get_value(entry));
61 static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
63 struct discover_device *ddev;
72 name = udev_device_get_sysname(dev);
74 pb_debug("udev_device_get_sysname failed\n");
78 typestr = udev_device_get_devtype(dev);
80 pb_debug("udev_device_get_devtype failed\n");
84 if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
85 pb_debug("SKIP %s: invalid type %s\n", name, typestr);
89 node = udev_device_get_devnode(dev);
90 path = udev_device_get_devpath(dev);
91 if (path && (strstr(path, "virtual/block/loop")
92 || strstr(path, "virtual/block/ram"))) {
93 pb_debug("SKIP: %s: ignored (path=%s)\n", name, path);
97 cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
99 /* CDROMs require a little initialisation, to get
100 * petitboot-compatible tray behaviour */
102 if (!cdrom_media_present(node)) {
103 pb_debug("SKIP: %s: no media present\n", name);
108 /* We have enough info to create the device and start discovery */
109 ddev = device_lookup_by_id(udev->handler, name);
111 pb_debug("device %s is already present?\n", name);
115 /* We may see multipath devices; they'll have the same uuid as an
116 * existing device, so only parse the first. */
117 uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
119 ddev = device_lookup_by_uuid(udev->handler, uuid);
121 pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
122 name, uuid, ddev->device->id);
127 ddev = discover_device_create(udev->handler, name);
129 ddev->device_path = talloc_strdup(ddev, node);
132 ddev->uuid = talloc_strdup(ddev, uuid);
133 prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
135 ddev->label = talloc_strdup(ddev, prop);
136 ddev->device->type = DEVICE_TYPE_DISK;
138 udev_setup_device_params(dev, ddev);
140 device_handler_discover(udev->handler, ddev);
145 static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
147 struct discover_device *ddev;
150 name = udev_device_get_sysname(dev);
152 pb_debug("udev_device_get_sysname failed\n");
156 ddev = device_lookup_by_id(udev->handler, name);
160 device_handler_remove(udev->handler, ddev);
165 static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
167 struct discover_device *ddev;
168 const char *name, *node;
170 name = udev_device_get_sysname(dev);
171 node = udev_device_get_devnode(dev);
173 /* we're only interested in CDROM change events at present */
174 if (!udev_device_get_property_value(dev, "ID_CDROM"))
177 /* handle CDROM eject requests */
178 if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
181 pb_debug("udev: eject request\n");
183 /* If the device is mounted, cdrom_id's own eject request may
184 * have failed. So, we'll need to do our own here.
186 ddev = device_lookup_by_id(udev->handler, name);
188 eject = ddev->mounted;
189 udev_handle_dev_remove(udev, dev);
198 if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
199 if (cdrom_media_present(node))
200 return udev_handle_dev_add(udev, dev);
202 return udev_handle_dev_remove(udev, dev);
208 static int udev_handle_dev_action(struct udev_device *dev, const char *action)
210 struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
214 struct udev_list_entry *list;
217 list = udev_device_get_properties_list_entry(dev);
218 name = udev_device_get_sysname(dev);
220 pb_debug("%s: action %s, device %s\n", __func__, action, name);
221 pb_debug("%s properties:\n", __func__);
223 for (; list; list = udev_list_entry_get_next(list))
224 pb_log("\t%-20s: %s\n", udev_list_entry_get_name(list),
225 udev_list_entry_get_value(list));
229 if (!strcmp(action, "add"))
230 return udev_handle_dev_add(udev, dev);
232 else if (!strcmp(action, "remove"))
233 return udev_handle_dev_remove(udev, dev);
235 else if (!strcmp(action, "change"))
236 return udev_handle_dev_change(udev, dev);
241 static int udev_enumerate(struct udev *udev)
244 struct udev_list_entry *list, *entry;
245 struct udev_enumerate *enumerate;
247 enumerate = udev_enumerate_new(udev);
250 pb_log("udev_enumerate_new failed\n");
254 result = udev_enumerate_add_match_subsystem(enumerate, "block");
257 pb_log("udev_enumerate_add_match_subsystem failed\n");
261 udev_enumerate_scan_devices(enumerate);
263 list = udev_enumerate_get_list_entry(enumerate);
266 pb_log("udev_enumerate_get_list_entry failed\n");
270 udev_list_entry_foreach(entry, list) {
272 struct udev_device *dev;
274 syspath = udev_list_entry_get_name(entry);
275 dev = udev_device_new_from_syspath(udev, syspath);
277 udev_handle_dev_action(dev, "add");
279 udev_device_unref(dev);
282 udev_enumerate_unref(enumerate);
286 udev_enumerate_unref(enumerate);
290 static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
293 struct udev_monitor *m;
296 m = udev_monitor_new_from_netlink(udev, "udev");
299 pb_log("udev_monitor_new_from_netlink failed\n");
303 result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
307 pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
311 result = udev_monitor_enable_receiving(m);
314 pb_log("udev_monitor_enable_receiving failed\n");
322 udev_monitor_unref(m);
327 * udev_process - waiter callback for monitor netlink.
330 static int udev_process(void *arg)
332 struct udev_monitor *monitor = arg;
333 struct udev_device *dev;
337 dev = udev_monitor_receive_device(monitor);
340 pb_log("udev_monitor_receive_device failed\n");
344 action = udev_device_get_action(dev);
347 pb_log("udev_device_get_action failed\n");
351 result = udev_handle_dev_action(dev, action);
353 udev_device_unref(dev);
357 udev_device_unref(dev);
361 static void udev_log_fn(struct udev __attribute__((unused)) *udev,
362 int __attribute__((unused)) priority, const char *file, int line,
363 const char *fn, const char *format, va_list args)
365 pb_log("libudev: %s %s:%d: ", fn, file, line);
366 vfprintf(pb_log_get_stream(), format, args);
369 struct pb_udev *udev_init(struct waitset *waitset,
370 struct device_handler *handler)
373 struct pb_udev *udev = talloc(NULL, struct pb_udev);
375 talloc_set_destructor(udev, udev_destructor);
376 udev->handler = handler;
378 udev->udev = udev_new();
381 pb_log("udev_new failed\n");
385 udev_set_userdata(udev->udev, udev);
387 udev_set_log_fn(udev->udev, udev_log_fn);
389 result = udev_enumerate(udev->udev);
394 result = udev_setup_monitor(udev->udev, &udev->monitor);
399 waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
400 udev_process, udev->monitor);
402 pb_debug("%s: waiting on udev\n", __func__);
408 udev_unref(udev->udev);
414 void udev_destroy(struct pb_udev *udev)