-#define _GNU_SOURCE
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
#include <assert.h>
#include <errno.h>
#include <talloc/talloc.h>
#include <waiter/waiter.h>
#include <system/system.h>
+#include <process/process.h>
#include "event.h"
#include "udev.h"
#include "pb-discover.h"
#include "device-handler.h"
+#include "cdrom.h"
+#include "devmapper.h"
+#include "network.h"
+
+/* We set a default monitor buffer size, as we may not process monitor
+ * events while performing device discvoery. systemd uses a 128M buffer, so
+ * we'll do the same here */
+static const int monitor_bufsize = 128 * 1024 * 1024;
struct pb_udev {
struct udev *udev;
{
struct pb_udev *udev = p;
- udev_monitor_unref(udev->monitor);
- udev->monitor = NULL;
+ if (udev->monitor) {
+ udev_monitor_unref(udev->monitor);
+ udev->monitor = NULL;
+ }
- udev_unref(udev->udev);
- udev->udev = NULL;
+ if (udev->udev) {
+ udev_unref(udev->udev);
+ udev->udev = NULL;
+ }
return 0;
}
udev_list_entry_get_value(entry));
}
-static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
+/*
+ * Search for LVM logical volumes. If any exist they should be recognised
+ * by udev as normal.
+ * Normally this is handled in an init script, but on some platforms
+ * disks are slow enough to come up that we need to check again.
+ */
+static void lvm_vg_search(struct device_handler *handler)
{
+ if (process_run_simple(handler, pb_system_apps.vgscan, "-qq", NULL))
+ pb_log("%s: Failed to execute vgscan\n", __func__);
+
+ if (process_run_simple(handler, pb_system_apps.vgchange, "-ay", "-qq",
+ NULL))
+ pb_log("%s: Failed to execute vgchange\n", __func__);
+}
+
+static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
+ const char *name)
+{
+ char *devlinks = NULL, *link, *saveptr = NULL;
struct discover_device *ddev;
+ unsigned int i = 0;
const char *typestr;
- const char *serial;
+ const char *uuid;
const char *path;
- const char *name;
+ const char *node;
const char *prop;
-
- name = udev_device_get_sysname(dev);
- if (!name) {
- pb_debug("udev_device_get_sysname failed\n");
- return -1;
- }
+ const char *type;
+ const char *devname;
+ const char *ignored_types[] = {
+ "linux_raid_member",
+ "swap",
+ NULL,
+ };
+ bool cdrom, usb;
typestr = udev_device_get_devtype(dev);
if (!typestr) {
}
if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
- pb_debug("SKIP %s: invalid type %s\n", name, typestr);
+ pb_log("SKIP %s: invalid type %s\n", name, typestr);
return 0;
}
+ node = udev_device_get_devnode(dev);
path = udev_device_get_devpath(dev);
- if (path && (strstr(path, "virtual/block/loop")
- || strstr(path, "virtual/block/ram"))) {
- pb_debug("SKIP: %s: ignored (path=%s)\n", name, path);
+ if (path && strstr(path, "virtual/block/loop")) {
+ pb_log("SKIP: %s: ignored (path=%s)\n", name, path);
return 0;
}
- /* We have enough info to create the device and start discovery */
- ddev = device_lookup_by_id(udev->handler, name);
- if (ddev) {
- pb_debug("device %s is already present?\n", name);
- return -1;
+ if (path && strstr(path, "virtual/block/ram")) {
+ device_handler_add_ramdisk(udev->handler, node);
+ return 0;
}
- /* we may also see multipath devices; same dev nodes (hence id), but
- * different serial numbers */
- serial = udev_device_get_property_value(dev, "ID_SERIAL");
- if (serial && device_lookup_by_serial(udev->handler, serial))
- return -1;
+ cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
+ if (cdrom) {
+ /* CDROMs require a little initialisation, to get
+ * petitboot-compatible tray behaviour */
+ cdrom_init(node);
+ if (!cdrom_media_present(node)) {
+ pb_log("SKIP: %s: no media present\n", name);
+ return 0;
+ }
+ }
- ddev = discover_device_create(udev->handler, name);
+ /* Ignore any device mapper devices that aren't logical volumes */
+ devname = udev_device_get_property_value(dev, "DM_NAME");
+ if (devname && ! udev_device_get_property_value(dev, "DM_LV_NAME")) {
+ pb_debug("SKIP: dm-device %s\n", devname);
+ return 0;
+ }
- ddev->device_path = talloc_strdup(ddev, udev_device_get_devnode(dev));
+ type = udev_device_get_property_value(dev, "ID_FS_TYPE");
+ if (!type) {
+ pb_log("SKIP: %s: no ID_FS_TYPE property\n", name);
+ return 0;
+ }
- prop = udev_device_get_property_value(dev, "ID_FS_UUID");
- if (prop)
- ddev->uuid = talloc_strdup(ddev, prop);
+ while (ignored_types[i]) {
+ if (!strncmp(type, ignored_types[i], strlen(ignored_types[i]))) {
+ pb_log("SKIP: %s: ignore '%s' filesystem\n", name, type);
+ return 0;
+ }
+ i++;
+ }
+
+ /* Search for LVM logical volumes if we see an LVM member */
+ if (strncmp(type, "LVM2_member", strlen("LVM2_member")) == 0) {
+ lvm_vg_search(udev->handler);
+ return 0;
+ }
+
+ /* We may see multipath devices; they'll have the same uuid as an
+ * existing device, so only parse the first. */
+ uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
+ if (uuid) {
+ ddev = device_lookup_by_uuid(udev->handler, uuid);
+ if (ddev) {
+ pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
+ name, uuid, ddev->device->id);
+ return 0;
+ }
+ }
+
+ /* Use DM_NAME for logical volumes, or the device name otherwise */
+ ddev = discover_device_create(udev->handler, uuid, devname ?: name);
+
+ if (devname) {
+ /*
+ * For logical volumes udev_device_get_devnode() returns a path
+ * of the form "/dev/dm-xx". These nodes names are not
+ * persistent and are opaque to the user. Instead use the more
+ * recognisable "/dev/mapper/lv-name" node if it is available.
+ */
+ devlinks = talloc_strdup(ddev,
+ udev_device_get_property_value(dev, "DEVLINKS"));
+ link = devlinks ? strtok_r(devlinks, " ", &saveptr) : NULL;
+ while (link) {
+ if (strncmp(link, "/dev/mapper/",
+ strlen("/dev/mapper/")) == 0) {
+ node = link;
+ break;
+ }
+ link = strtok_r(NULL, " ", &saveptr);
+ }
+ }
+
+ ddev->device_path = talloc_strdup(ddev, node);
+ talloc_free(devlinks);
+
+ if (uuid)
+ ddev->uuid = talloc_strdup(ddev, uuid);
prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
if (prop)
ddev->label = talloc_strdup(ddev, prop);
- ddev->device->type = DEVICE_TYPE_DISK;
+
+ usb = !!udev_device_get_property_value(dev, "ID_USB_DRIVER");
+ if (cdrom)
+ ddev->device->type = DEVICE_TYPE_OPTICAL;
+ else
+ ddev->device->type = usb ? DEVICE_TYPE_USB : DEVICE_TYPE_DISK;
udev_setup_device_params(dev, ddev);
+ /* Create a snapshot for all disk devices */
+ if ((ddev->device->type == DEVICE_TYPE_DISK ||
+ ddev->device->type == DEVICE_TYPE_USB))
+ devmapper_init_snapshot(udev->handler, ddev);
+
device_handler_discover(udev->handler, ddev);
return 0;
}
+/*
+ * Mark valid interfaces as 'ready'.
+ * The udev_enumerate_add_match_is_initialized() filter in udev_enumerate()
+ * ensures that any device we see is properly initialized by udev (eg. interface
+ * names); here we check that the properties are sane and mark the interface
+ * as ready for configuration in discover/network.
+ */
+static int udev_check_interface_ready(struct device_handler *handler,
+ struct udev_device *dev)
+{
+ const char *name, *name_path, *ifindex, *interface, *mac_name;
+ uint8_t *mac;
+ char byte[3];
+ unsigned int i, j;
+
+
+ name = udev_device_get_sysname(dev);
+ if (!name) {
+ pb_debug("udev_device_get_sysname failed\n");
+ return -1;
+ }
+
+ name_path = udev_device_get_property_value(dev, "ID_NET_NAME_PATH");
+ ifindex = udev_device_get_property_value(dev, "IFINDEX");
+ interface = udev_device_get_property_value(dev, "INTERFACE");
+ mac_name = udev_device_get_property_value(dev, "ID_NET_NAME_MAC");
+
+ /* Physical interfaces should have all of these properties */
+ if (!name_path || !ifindex || !interface || !mac_name) {
+ pb_debug("%s: interface %s missing properties\n",
+ __func__, name);
+ return -1;
+ }
+
+ /* ID_NET_NAME_MAC format is enxMACADDR */
+ if (strlen(mac_name) < 15) {
+ pb_debug("%s: Unexpected MAC format: %s\n",
+ __func__, mac_name);
+ return -1;
+ }
+
+ mac = talloc_array(handler, uint8_t, HWADDR_SIZE);
+ if (!mac)
+ return -1;
+
+ /*
+ * ID_NET_NAME_MAC is not a conventionally formatted MAC
+ * string - convert it before passing it to network.c
+ */
+ byte[2] = '\0';
+ for (i = strlen("enx"), j = 0;
+ i < strlen(mac_name) && j < HWADDR_SIZE; i += 2) {
+ memcpy(byte, &mac_name[i], 2);
+ mac[j++] = strtoul(byte, NULL, 16);
+ }
+
+ network_mark_interface_ready(handler,
+ atoi(ifindex), interface, mac, HWADDR_SIZE);
+
+ talloc_free(mac);
+ return 0;
+}
+
+static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
+{
+ const char *subsys;
+ const char *name;
+
+ name = udev_device_get_sysname(dev);
+ if (!name) {
+ pb_debug("udev_device_get_sysname failed\n");
+ return -1;
+ }
+
+ subsys = udev_device_get_subsystem(dev);
+ if (!subsys) {
+ pb_debug("udev_device_get_subsystem failed\n");
+ return -1;
+ }
+
+ /* If we see a net device, check if it is ready to be used */
+ if (!strncmp(subsys, "net", strlen("net")))
+ return udev_check_interface_ready(udev->handler, dev);
+
+ if (device_lookup_by_id(udev->handler, name)) {
+ pb_debug("device %s is already present?\n", name);
+ return -1;
+ }
+
+ if (!strcmp(subsys, "block")) {
+ return udev_handle_block_add(udev, dev, name);
+ }
+
+ pb_log("SKIP %s: unknown subsystem %s\n", name, subsys);
+ return -1;
+}
+
+
static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
{
struct discover_device *ddev;
return 0;
}
+
+/* returns true if further event processing should stop (eg., we've
+ * ejected the cdrom)
+ */
+static bool udev_handle_cdrom_events(struct pb_udev *udev,
+ struct udev_device *dev, struct discover_device *ddev)
+{
+ const char *node;
+ bool eject = false;
+
+ node = udev_device_get_devnode(dev);
+
+ /* handle CDROM eject requests */
+ if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
+ pb_debug("udev: eject request\n");
+
+ /* If the device is mounted, cdrom_id's own eject request may
+ * have failed. So, we'll need to do our own here.
+ */
+ if (ddev) {
+ eject = ddev->mounted;
+ udev_handle_dev_remove(udev, dev);
+ }
+
+ if (eject)
+ cdrom_eject(node);
+
+ return true;
+ }
+
+ if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
+ if (cdrom_media_present(node))
+ udev_handle_dev_add(udev, dev);
+ else
+ udev_handle_dev_remove(udev, dev);
+ return true;
+ }
+
+ return false;
+}
+
+static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
+{
+ struct discover_device *ddev;
+ const char *subsys;
+ const char *name;
+ int rc = 0;
+
+ name = udev_device_get_sysname(dev);
+ subsys = udev_device_get_subsystem(dev);
+
+ /* If we see a net device, check if it is ready to be used */
+ if (!strncmp(subsys, "net", strlen("net")))
+ return udev_check_interface_ready(udev->handler, dev);
+
+ ddev = device_lookup_by_id(udev->handler, name);
+
+ /* if this is a CDROM device, process eject & media change requests;
+ * these may stop further processing */
+ if (!udev_device_get_property_value(dev, "ID_CDROM")) {
+ if (udev_handle_cdrom_events(udev, dev, ddev))
+ return 0;
+ }
+
+ /* if this is a new device, treat it as an add */
+ if (!ddev)
+ rc = udev_handle_dev_add(udev, dev);
+
+ return rc;
+}
+
static int udev_handle_dev_action(struct udev_device *dev, const char *action)
{
struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
+ struct udev_list_entry *list;
+ const char *name;
+
+ list = udev_device_get_properties_list_entry(dev);
+ name = udev_device_get_sysname(dev);
+
+ pb_debug("udev: action %s, device %s\n", action, name);
+ pb_debug("udev: properties:\n");
+
+ for (; list; list = udev_list_entry_get_next(list))
+ pb_debug("\t%-20s: %s\n", udev_list_entry_get_name(list),
+ udev_list_entry_get_value(list));
if (!strcmp(action, "add"))
return udev_handle_dev_add(udev, dev);
else if (!strcmp(action, "remove"))
return udev_handle_dev_remove(udev, dev);
+ else if (!strcmp(action, "change"))
+ return udev_handle_dev_change(udev, dev);
+
return 0;
}
}
result = udev_enumerate_add_match_subsystem(enumerate, "block");
+ if (result) {
+ pb_log("udev_enumerate_add_match_subsystem failed\n");
+ goto fail;
+ }
+ result = udev_enumerate_add_match_subsystem(enumerate, "net");
if (result) {
pb_log("udev_enumerate_add_match_subsystem failed\n");
goto fail;
}
+ result = udev_enumerate_add_match_is_initialized(enumerate);
+ if (result) {
+ pb_log("udev_enumerate_add_match_is_initialised failed\n");
+ goto fail;
+ }
+
udev_enumerate_scan_devices(enumerate);
list = udev_enumerate_get_list_entry(enumerate);
- if (!list) {
- pb_log("udev_enumerate_get_list_entry failed\n");
- goto fail;
- }
-
udev_list_entry_foreach(entry, list) {
const char *syspath;
struct udev_device *dev;
goto out_err;
}
+ result = udev_monitor_set_receive_buffer_size(m, monitor_bufsize);
+ if (result) {
+ pb_log("udev_monitor_set_rx_bufsize(%d) failed\n",
+ monitor_bufsize);
+ }
+
result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
NULL);
goto out_err;
}
+ result = udev_monitor_filter_add_match_subsystem_devtype(m, "net",
+ NULL);
+
+ if (result) {
+ pb_log("udev_monitor_filter_add_match_subsystem_devtype failed\n");
+ goto out_err;
+ }
+
result = udev_monitor_enable_receiving(m);
if (result) {
struct udev_monitor *monitor = arg;
struct udev_device *dev;
const char *action;
- int result;
dev = udev_monitor_receive_device(monitor);
-
if (!dev) {
pb_log("udev_monitor_receive_device failed\n");
return -1;
if (!action) {
pb_log("udev_device_get_action failed\n");
- goto fail;
+ } else {
+ udev_handle_dev_action(dev, action);
}
- result = udev_handle_dev_action(dev, action);
-
- udev_device_unref(dev);
- return result;
-
-fail:
udev_device_unref(dev);
- return -1;
+ return 0;
}
+#ifdef UDEV_LOGGING
static void udev_log_fn(struct udev __attribute__((unused)) *udev,
int __attribute__((unused)) priority, const char *file, int line,
const char *fn, const char *format, va_list args)
pb_log("libudev: %s %s:%d: ", fn, file, line);
vfprintf(pb_log_get_stream(), format, args);
}
+#endif
-struct pb_udev *udev_init(struct waitset *waitset,
- struct device_handler *handler)
+struct pb_udev *udev_init(struct device_handler *handler,
+ struct waitset *waitset)
{
+ struct pb_udev *udev;
int result;
- struct pb_udev *udev = talloc(NULL, struct pb_udev);
+ udev = talloc_zero(handler, struct pb_udev);
talloc_set_destructor(udev, udev_destructor);
udev->handler = handler;
if (!udev->udev) {
pb_log("udev_new failed\n");
- goto fail_new;
+ goto fail;
}
udev_set_userdata(udev->udev, udev);
+#ifdef UDEV_LOGGING
udev_set_log_fn(udev->udev, udev_log_fn);
-
- result = udev_enumerate(udev->udev);
-
- if (result)
- goto fail_enumerate;
+#endif
result = udev_setup_monitor(udev->udev, &udev->monitor);
+ if (result)
+ goto fail;
+ result = udev_enumerate(udev->udev);
if (result)
- goto fail_monitor;
+ goto fail;
waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
udev_process, udev->monitor);
return udev;
-fail_monitor:
-fail_enumerate:
- udev_unref(udev->udev);
-fail_new:
+fail:
talloc_free(udev);
return NULL;
}
-void udev_destroy(struct pb_udev *udev)
+void udev_reinit(struct pb_udev *udev)
{
- talloc_free(udev);
+ pb_log("udev: reinit requested, starting enumeration\n");
+ udev_enumerate(udev->udev);
}
projects / petitboot / blobdiff