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 const char *ignored_types[] = {
93 typestr = udev_device_get_devtype(dev);
95 pb_debug("udev_device_get_devtype failed\n");
99 if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
100 pb_log("SKIP %s: invalid type %s\n", name, typestr);
104 node = udev_device_get_devnode(dev);
105 path = udev_device_get_devpath(dev);
106 if (path && strstr(path, "virtual/block/loop")) {
107 pb_log("SKIP: %s: ignored (path=%s)\n", name, path);
111 if (path && strstr(path, "virtual/block/ram")) {
112 device_handler_add_ramdisk(udev->handler, node);
116 cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
118 /* CDROMs require a little initialisation, to get
119 * petitboot-compatible tray behaviour */
121 if (!cdrom_media_present(node)) {
122 pb_log("SKIP: %s: no media present\n", name);
127 /* If our environment's udev can recognise them explictly skip any
128 * device mapper devices we encounter */
129 devname = udev_device_get_property_value(dev, "DM_NAME");
131 pb_debug("SKIP: dm-device %s\n", devname);
135 type = udev_device_get_property_value(dev, "ID_FS_TYPE");
137 pb_log("SKIP: %s: no ID_FS_TYPE property\n", name);
141 while (ignored_types[i]) {
142 if (!strncmp(type, ignored_types[i], strlen(ignored_types[i]))) {
143 pb_log("SKIP: %s: ignore '%s' filesystem\n", name, type);
149 /* We may see multipath devices; they'll have the same uuid as an
150 * existing device, so only parse the first. */
151 uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
153 ddev = device_lookup_by_uuid(udev->handler, uuid);
155 pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
156 name, uuid, ddev->device->id);
161 ddev = discover_device_create(udev->handler, name);
163 ddev->device_path = talloc_strdup(ddev, node);
166 ddev->uuid = talloc_strdup(ddev, uuid);
167 prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
169 ddev->label = talloc_strdup(ddev, prop);
171 usb = !!udev_device_get_property_value(dev, "ID_USB_DRIVER");
173 ddev->device->type = DEVICE_TYPE_OPTICAL;
175 ddev->device->type = usb ? DEVICE_TYPE_USB : DEVICE_TYPE_DISK;
177 udev_setup_device_params(dev, ddev);
179 /* Create a snapshot for all disk devices */
180 if ((ddev->device->type == DEVICE_TYPE_DISK ||
181 ddev->device->type == DEVICE_TYPE_USB))
182 devmapper_init_snapshot(udev->handler, ddev);
184 device_handler_discover(udev->handler, ddev);
189 static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
194 name = udev_device_get_sysname(dev);
196 pb_debug("udev_device_get_sysname failed\n");
200 subsys = udev_device_get_subsystem(dev);
202 pb_debug("udev_device_get_subsystem failed\n");
206 if (device_lookup_by_id(udev->handler, name)) {
207 pb_debug("device %s is already present?\n", name);
211 if (!strcmp(subsys, "block")) {
212 return udev_handle_block_add(udev, dev, name);
215 pb_log("SKIP %s: unknown subsystem %s\n", name, subsys);
220 static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
222 struct discover_device *ddev;
225 name = udev_device_get_sysname(dev);
227 pb_debug("udev_device_get_sysname failed\n");
231 ddev = device_lookup_by_id(udev->handler, name);
235 device_handler_remove(udev->handler, ddev);
240 /* returns true if further event processing should stop (eg., we've
243 static bool udev_handle_cdrom_events(struct pb_udev *udev,
244 struct udev_device *dev, struct discover_device *ddev)
249 node = udev_device_get_devnode(dev);
251 /* handle CDROM eject requests */
252 if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
253 pb_debug("udev: eject request\n");
255 /* If the device is mounted, cdrom_id's own eject request may
256 * have failed. So, we'll need to do our own here.
259 eject = ddev->mounted;
260 udev_handle_dev_remove(udev, dev);
269 if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
270 if (cdrom_media_present(node))
271 udev_handle_dev_add(udev, dev);
273 udev_handle_dev_remove(udev, dev);
280 static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
282 struct discover_device *ddev;
286 name = udev_device_get_sysname(dev);
288 ddev = device_lookup_by_id(udev->handler, name);
290 /* if this is a CDROM device, process eject & media change requests;
291 * these may stop further processing */
292 if (!udev_device_get_property_value(dev, "ID_CDROM")) {
293 if (udev_handle_cdrom_events(udev, dev, ddev))
297 /* if this is a new device, treat it as an add */
299 rc = udev_handle_dev_add(udev, dev);
304 static int udev_handle_dev_action(struct udev_device *dev, const char *action)
306 struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
307 struct udev_list_entry *list;
310 list = udev_device_get_properties_list_entry(dev);
311 name = udev_device_get_sysname(dev);
313 pb_debug("udev: action %s, device %s\n", action, name);
314 pb_debug("udev: properties:\n");
316 for (; list; list = udev_list_entry_get_next(list))
317 pb_debug("\t%-20s: %s\n", udev_list_entry_get_name(list),
318 udev_list_entry_get_value(list));
320 if (!strcmp(action, "add"))
321 return udev_handle_dev_add(udev, dev);
323 else if (!strcmp(action, "remove"))
324 return udev_handle_dev_remove(udev, dev);
326 else if (!strcmp(action, "change"))
327 return udev_handle_dev_change(udev, dev);
332 static int udev_enumerate(struct udev *udev)
335 struct udev_list_entry *list, *entry;
336 struct udev_enumerate *enumerate;
338 enumerate = udev_enumerate_new(udev);
341 pb_log("udev_enumerate_new failed\n");
345 result = udev_enumerate_add_match_subsystem(enumerate, "block");
347 pb_log("udev_enumerate_add_match_subsystem failed\n");
351 result = udev_enumerate_add_match_is_initialized(enumerate);
353 pb_log("udev_enumerate_add_match_is_initialised failed\n");
357 udev_enumerate_scan_devices(enumerate);
359 list = udev_enumerate_get_list_entry(enumerate);
361 udev_list_entry_foreach(entry, list) {
363 struct udev_device *dev;
365 syspath = udev_list_entry_get_name(entry);
366 dev = udev_device_new_from_syspath(udev, syspath);
368 udev_handle_dev_action(dev, "add");
370 udev_device_unref(dev);
373 udev_enumerate_unref(enumerate);
377 udev_enumerate_unref(enumerate);
381 static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
384 struct udev_monitor *m;
387 m = udev_monitor_new_from_netlink(udev, "udev");
390 pb_log("udev_monitor_new_from_netlink failed\n");
394 result = udev_monitor_set_receive_buffer_size(m, monitor_bufsize);
396 pb_log("udev_monitor_set_rx_bufsize(%d) failed\n",
400 result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
404 pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
408 result = udev_monitor_enable_receiving(m);
411 pb_log("udev_monitor_enable_receiving failed\n");
419 udev_monitor_unref(m);
424 * udev_process - waiter callback for monitor netlink.
427 static int udev_process(void *arg)
429 struct udev_monitor *monitor = arg;
430 struct udev_device *dev;
433 dev = udev_monitor_receive_device(monitor);
435 pb_log("udev_monitor_receive_device failed\n");
439 action = udev_device_get_action(dev);
442 pb_log("udev_device_get_action failed\n");
444 udev_handle_dev_action(dev, action);
447 udev_device_unref(dev);
452 static void udev_log_fn(struct udev __attribute__((unused)) *udev,
453 int __attribute__((unused)) priority, const char *file, int line,
454 const char *fn, const char *format, va_list args)
456 pb_log("libudev: %s %s:%d: ", fn, file, line);
457 vfprintf(pb_log_get_stream(), format, args);
461 struct pb_udev *udev_init(struct device_handler *handler,
462 struct waitset *waitset)
464 struct pb_udev *udev;
467 udev = talloc_zero(handler, struct pb_udev);
468 talloc_set_destructor(udev, udev_destructor);
469 udev->handler = handler;
471 udev->udev = udev_new();
474 pb_log("udev_new failed\n");
478 udev_set_userdata(udev->udev, udev);
481 udev_set_log_fn(udev->udev, udev_log_fn);
484 result = udev_setup_monitor(udev->udev, &udev->monitor);
488 result = udev_enumerate(udev->udev);
492 waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
493 udev_process, udev->monitor);
495 pb_debug("%s: waiting on udev\n", __func__);
504 void udev_reinit(struct pb_udev *udev)
506 pb_log("udev: reinit requested, starting enumeration\n");
507 udev_enumerate(udev->udev);