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"
28 #include "devmapper.h"
30 /* We set a default monitor buffer size, as we may not process monitor
31 * events while performing device discvoery. systemd uses a 128M buffer, so
32 * we'll do the same here */
33 static const int monitor_bufsize = 128 * 1024 * 1024;
37 struct udev_monitor *monitor;
38 struct device_handler *handler;
41 static int udev_destructor(void *p)
43 struct pb_udev *udev = p;
46 udev_monitor_unref(udev->monitor);
51 udev_unref(udev->udev);
58 static void udev_setup_device_params(struct udev_device *udev,
59 struct discover_device *dev)
61 struct udev_list_entry *list, *entry;
63 list = udev_device_get_properties_list_entry(udev);
67 udev_list_entry_foreach(entry, list)
68 discover_device_set_param(dev,
69 udev_list_entry_get_name(entry),
70 udev_list_entry_get_value(entry));
73 static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
76 struct discover_device *ddev;
85 typestr = udev_device_get_devtype(dev);
87 pb_debug("udev_device_get_devtype failed\n");
91 if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
92 pb_log("SKIP %s: invalid type %s\n", name, typestr);
96 node = udev_device_get_devnode(dev);
97 path = udev_device_get_devpath(dev);
98 if (path && strstr(path, "virtual/block/loop")) {
99 pb_log("SKIP: %s: ignored (path=%s)\n", name, path);
103 if (path && strstr(path, "virtual/block/ram")) {
104 device_handler_add_ramdisk(udev->handler, node);
108 cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
110 /* CDROMs require a little initialisation, to get
111 * petitboot-compatible tray behaviour */
113 if (!cdrom_media_present(node)) {
114 pb_log("SKIP: %s: no media present\n", name);
119 /* If our environment's udev can recognise them explictly skip any
120 * device mapper devices we encounter */
121 const char *devname = udev_device_get_property_value(dev, "DM_NAME");
123 pb_log("SKIP: dm-device %s\n", devname);
127 type = udev_device_get_property_value(dev, "ID_FS_TYPE");
129 pb_log("SKIP: %s: no ID_FS_TYPE property\n", name);
133 /* We may see multipath devices; they'll have the same uuid as an
134 * existing device, so only parse the first. */
135 uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
137 ddev = device_lookup_by_uuid(udev->handler, uuid);
139 pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
140 name, uuid, ddev->device->id);
145 ddev = discover_device_create(udev->handler, name);
147 ddev->device_path = talloc_strdup(ddev, node);
150 ddev->uuid = talloc_strdup(ddev, uuid);
151 prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
153 ddev->label = talloc_strdup(ddev, prop);
154 ddev->device->type = cdrom ? DEVICE_TYPE_OPTICAL : DEVICE_TYPE_DISK;
156 udev_setup_device_params(dev, ddev);
158 if (ddev->device->type == DEVICE_TYPE_DISK)
159 devmapper_init_snapshot(udev->handler, ddev);
161 device_handler_discover(udev->handler, ddev);
166 static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
171 name = udev_device_get_sysname(dev);
173 pb_debug("udev_device_get_sysname failed\n");
177 subsys = udev_device_get_subsystem(dev);
179 pb_debug("udev_device_get_subsystem failed\n");
183 if (device_lookup_by_id(udev->handler, name)) {
184 pb_debug("device %s is already present?\n", name);
188 if (!strcmp(subsys, "block")) {
189 return udev_handle_block_add(udev, dev, name);
192 pb_log("SKIP %s: unknown subsystem %s\n", name, subsys);
197 static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
199 struct discover_device *ddev;
202 name = udev_device_get_sysname(dev);
204 pb_debug("udev_device_get_sysname failed\n");
208 ddev = device_lookup_by_id(udev->handler, name);
212 device_handler_remove(udev->handler, ddev);
217 /* returns true if further event processing should stop (eg., we've
220 static bool udev_handle_cdrom_events(struct pb_udev *udev,
221 struct udev_device *dev, struct discover_device *ddev)
225 node = udev_device_get_devnode(dev);
227 /* handle CDROM eject requests */
228 if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
231 pb_debug("udev: eject request\n");
233 /* If the device is mounted, cdrom_id's own eject request may
234 * have failed. So, we'll need to do our own here.
237 eject = ddev->mounted;
238 udev_handle_dev_remove(udev, dev);
248 if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
249 if (cdrom_media_present(node))
250 udev_handle_dev_add(udev, dev);
252 udev_handle_dev_remove(udev, dev);
259 static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
261 struct discover_device *ddev;
265 name = udev_device_get_sysname(dev);
267 ddev = device_lookup_by_id(udev->handler, name);
269 /* if this is a CDROM device, process eject & media change requests;
270 * these may stop further processing */
271 if (!udev_device_get_property_value(dev, "ID_CDROM")) {
272 if (udev_handle_cdrom_events(udev, dev, ddev))
276 /* if this is a new device, treat it as an add */
278 rc = udev_handle_dev_add(udev, dev);
283 static int udev_handle_dev_action(struct udev_device *dev, const char *action)
285 struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
286 struct udev_list_entry *list;
289 list = udev_device_get_properties_list_entry(dev);
290 name = udev_device_get_sysname(dev);
292 pb_debug("udev: action %s, device %s\n", action, name);
293 pb_debug("udev: properties:\n");
295 for (; list; list = udev_list_entry_get_next(list))
296 pb_debug("\t%-20s: %s\n", udev_list_entry_get_name(list),
297 udev_list_entry_get_value(list));
299 if (!strcmp(action, "add"))
300 return udev_handle_dev_add(udev, dev);
302 else if (!strcmp(action, "remove"))
303 return udev_handle_dev_remove(udev, dev);
305 else if (!strcmp(action, "change"))
306 return udev_handle_dev_change(udev, dev);
311 static int udev_enumerate(struct udev *udev)
314 struct udev_list_entry *list, *entry;
315 struct udev_enumerate *enumerate;
317 enumerate = udev_enumerate_new(udev);
320 pb_log("udev_enumerate_new failed\n");
324 result = udev_enumerate_add_match_subsystem(enumerate, "block");
326 pb_log("udev_enumerate_add_match_subsystem failed\n");
330 result = udev_enumerate_add_match_is_initialized(enumerate);
332 pb_log("udev_enumerate_add_match_is_initialised failed\n");
336 udev_enumerate_scan_devices(enumerate);
338 list = udev_enumerate_get_list_entry(enumerate);
340 udev_list_entry_foreach(entry, list) {
342 struct udev_device *dev;
344 syspath = udev_list_entry_get_name(entry);
345 dev = udev_device_new_from_syspath(udev, syspath);
347 udev_handle_dev_action(dev, "add");
349 udev_device_unref(dev);
352 udev_enumerate_unref(enumerate);
356 udev_enumerate_unref(enumerate);
360 static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
363 struct udev_monitor *m;
366 m = udev_monitor_new_from_netlink(udev, "udev");
369 pb_log("udev_monitor_new_from_netlink failed\n");
373 result = udev_monitor_set_receive_buffer_size(m, monitor_bufsize);
375 pb_log("udev_monitor_set_rx_bufsize(%d) failed\n",
379 result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
383 pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
387 result = udev_monitor_enable_receiving(m);
390 pb_log("udev_monitor_enable_receiving failed\n");
398 udev_monitor_unref(m);
403 * udev_process - waiter callback for monitor netlink.
406 static int udev_process(void *arg)
408 struct udev_monitor *monitor = arg;
409 struct udev_device *dev;
412 dev = udev_monitor_receive_device(monitor);
414 pb_log("udev_monitor_receive_device failed\n");
418 action = udev_device_get_action(dev);
421 pb_log("udev_device_get_action failed\n");
423 udev_handle_dev_action(dev, action);
426 udev_device_unref(dev);
430 static void udev_log_fn(struct udev __attribute__((unused)) *udev,
431 int __attribute__((unused)) priority, const char *file, int line,
432 const char *fn, const char *format, va_list args)
434 pb_log("libudev: %s %s:%d: ", fn, file, line);
435 vfprintf(pb_log_get_stream(), format, args);
438 struct pb_udev *udev_init(struct device_handler *handler,
439 struct waitset *waitset)
441 struct pb_udev *udev;
444 udev = talloc_zero(handler, struct pb_udev);
445 talloc_set_destructor(udev, udev_destructor);
446 udev->handler = handler;
448 udev->udev = udev_new();
451 pb_log("udev_new failed\n");
455 udev_set_userdata(udev->udev, udev);
457 udev_set_log_fn(udev->udev, udev_log_fn);
459 result = udev_setup_monitor(udev->udev, &udev->monitor);
463 result = udev_enumerate(udev->udev);
467 waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
468 udev_process, udev->monitor);
470 pb_debug("%s: waiting on udev\n", __func__);
479 void udev_reinit(struct pb_udev *udev)
481 pb_log("udev: reinit requested, starting enumeration\n");
482 udev_enumerate(udev->udev);