-/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
[DEVICE_DEAD] = UNIT_INACTIVE,
- [DEVICE_AVAILABLE] = UNIT_ACTIVE
+ [DEVICE_PLUGGED] = UNIT_ACTIVE
};
-static void device_done(Unit *u) {
- Device *d = DEVICE(u);
+static void device_unset_sysfs(Device *d) {
+ Device *first;
assert(d);
+ if (!d->sysfs)
+ return;
+
+ /* Remove this unit from the chain of devices which share the
+ * same sysfs path. */
+ first = hashmap_get(d->meta.manager->devices_by_sysfs, d->sysfs);
+ LIST_REMOVE(Device, same_sysfs, first, d);
+
+ if (first)
+ hashmap_remove_and_replace(d->meta.manager->devices_by_sysfs, d->sysfs, first->sysfs, first);
+ else
+ hashmap_remove(d->meta.manager->devices_by_sysfs, d->sysfs);
+
free(d->sysfs);
d->sysfs = NULL;
}
+static void device_init(Unit *u) {
+ Device *d = DEVICE(u);
+
+ assert(d);
+ assert(d->meta.load_state == UNIT_STUB);
+
+ /* In contrast to all other unit types we timeout jobs waiting
+ * for devices by default. This is because they otherwise wait
+ * indefinetely for plugged in devices, something which cannot
+ * happen for the other units since their operations time out
+ * anyway. */
+ d->meta.job_timeout = DEFAULT_TIMEOUT_USEC;
+}
+
+static void device_done(Unit *u) {
+ Device *d = DEVICE(u);
+
+ assert(d);
+
+ device_unset_sysfs(d);
+}
+
static void device_set_state(Device *d, DeviceState state) {
DeviceState old_state;
assert(d);
assert(d->state == DEVICE_DEAD);
if (d->sysfs)
- device_set_state(d, DEVICE_AVAILABLE);
+ device_set_state(d, DEVICE_PLUGGED);
return 0;
}
return device_state_to_string(DEVICE(u)->state);
}
-static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) {
+static int device_add_escaped_name(Unit *u, const char *dn) {
char *e;
int r;
return -ENOMEM;
r = unit_add_name(u, e);
-
- if (r >= 0 && make_id)
- unit_choose_id(u, e);
-
free(e);
if (r < 0 && r != -EEXIST)
return 0;
}
-static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
- const char *dn, *wants, *sysfs, *model, *alias;
+static int device_update_unit(Manager *m, struct udev_device *dev, const char *path, bool main) {
+ const char *sysfs, *model;
Unit *u = NULL;
int r;
- char *w, *state;
- size_t l;
bool delete;
- struct udev_list_entry *item = NULL, *first = NULL;
assert(m);
if (!(sysfs = udev_device_get_syspath(dev)))
return -ENOMEM;
- /* Check whether this entry is even relevant for us. */
- dn = udev_device_get_devnode(dev);
- wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
- alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS");
-
- /* We allow exactly one alias to be configured a this time and
- * it must be a path */
-
- if (alias && !is_path(alias)) {
- log_warning("SYSTEMD_ALIAS for %s is not a path, ignoring: %s", sysfs, alias);
- alias = NULL;
- }
-
- if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
+ if ((r = device_find_escape_name(m, path, &u)) < 0)
return r;
- if (r == 0 && dn)
- if ((r = device_find_escape_name(m, dn, &u)) < 0)
- return r;
-
- if (r == 0) {
- first = udev_device_get_devlinks_list_entry(dev);
- udev_list_entry_foreach(item, first) {
- if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
- return r;
-
- if (r > 0)
- break;
- }
- }
-
- if (r == 0 && alias)
- if ((r = device_find_escape_name(m, alias, &u)) < 0)
- return r;
-
- /* FIXME: this needs proper merging */
-
- assert((r > 0) == !!u);
-
- /* If this is a different unit, then let's not merge things */
if (u && DEVICE(u)->sysfs && !path_equal(DEVICE(u)->sysfs, sysfs))
- u = NULL;
+ return -EEXIST;
if (!u) {
delete = true;
if (!(u = unit_new(m)))
return -ENOMEM;
- if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
+ if ((r = device_add_escaped_name(u, path)) < 0)
goto fail;
unit_add_to_load_queue(u);
} else
delete = false;
- if (!(DEVICE(u)->sysfs))
+ /* If this was created via some dependency and has not
+ * actually been seen yet ->sysfs will not be
+ * initialized. Hence initialize it if necessary. */
+
+ if (!DEVICE(u)->sysfs) {
+ Device *first;
+
if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
r = -ENOMEM;
goto fail;
}
- if (alias)
- if ((r = device_add_escaped_name(u, alias, true)) < 0)
- goto fail;
+ if (!m->devices_by_sysfs)
+ if (!(m->devices_by_sysfs = hashmap_new(string_hash_func, string_compare_func))) {
+ r = -ENOMEM;
+ goto fail;
+ }
- if (dn)
- if ((r = device_add_escaped_name(u, dn, true)) < 0)
- goto fail;
+ first = hashmap_get(m->devices_by_sysfs, sysfs);
+ LIST_PREPEND(Device, same_sysfs, first, DEVICE(u));
- first = udev_device_get_devlinks_list_entry(dev);
- udev_list_entry_foreach(item, first)
- if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
+ if ((r = hashmap_replace(m->devices_by_sysfs, DEVICE(u)->sysfs, first)) < 0)
goto fail;
+ }
if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
(model = udev_device_get_property_value(dev, "ID_MODEL"))) {
if ((r = unit_set_description(u, model)) < 0)
goto fail;
- } else if (dn) {
- if ((r = unit_set_description(u, dn)) < 0)
- goto fail;
} else
- if ((r = unit_set_description(u, sysfs)) < 0)
+ if ((r = unit_set_description(u, path)) < 0)
goto fail;
- if (wants) {
- FOREACH_WORD_QUOTED(w, l, wants, state) {
- char *e;
-
- if (!(e = strndup(w, l))) {
- r = -ENOMEM;
- goto fail;
+ if (main) {
+ /* The additional systemd udev properties we only
+ * interpret for the main object */
+ const char *wants, *alias;
+
+ if ((alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS"))) {
+ if (!is_path(alias))
+ log_warning("SYSTEMD_ALIAS for %s is not a path, ignoring: %s", sysfs, alias);
+ else {
+ if ((r = device_add_escaped_name(u, alias)) < 0)
+ goto fail;
}
+ }
- r = unit_add_dependency_by_name(u, UNIT_WANTS, e, NULL, true);
- free(e);
+ if ((wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS"))) {
+ char *state, *w;
+ size_t l;
- if (r < 0)
- goto fail;
- }
- }
+ FOREACH_WORD_QUOTED(w, l, wants, state) {
+ char *e;
- if (update_state) {
- manager_dispatch_load_queue(u->meta.manager);
- device_set_state(DEVICE(u), DEVICE_AVAILABLE);
+ if (!(e = strndup(w, l))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ r = unit_add_dependency_by_name(u, UNIT_WANTS, e, NULL, true);
+ free(e);
+
+ if (r < 0)
+ goto fail;
+ }
+ }
}
unit_add_to_dbus_queue(u);
-
return 0;
fail:
-
log_warning("Failed to load device unit: %s", strerror(-r));
if (delete && u)
return r;
}
+static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
+ const char *sysfs, *dn;
+ struct udev_list_entry *item = NULL, *first = NULL;
+
+ assert(m);
+
+ if (!(sysfs = udev_device_get_syspath(dev)))
+ return -ENOMEM;
+
+ /* Add the main unit named after the sysfs path */
+ device_update_unit(m, dev, sysfs, true);
+
+ /* Add an additional unit for the device node */
+ if ((dn = udev_device_get_devnode(dev)))
+ device_update_unit(m, dev, dn, false);
+
+ /* Add additional units for all symlinks */
+ first = udev_device_get_devlinks_list_entry(dev);
+ udev_list_entry_foreach(item, first) {
+ const char *p;
+ struct stat st;
+
+ /* Don't bother with the /dev/block links */
+ p = udev_list_entry_get_name(item);
+
+ if (path_startswith(p, "/dev/block/") ||
+ path_startswith(p, "/dev/char/"))
+ continue;
+
+ /* Verify that the symlink in the FS actually belongs
+ * to this device. This is useful to deal with
+ * conflicting devices, e.g. when two disks want the
+ * same /dev/disk/by-label/xxx link because they have
+ * the same label. We want to make sure that the same
+ * device that won the symlink wins in systemd, so we
+ * check the device node major/minor*/
+ if (stat(p, &st) >= 0)
+ if ((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) ||
+ st.st_rdev != udev_device_get_devnum(dev))
+ continue;
+
+ device_update_unit(m, dev, p, false);
+ }
+
+ if (update_state) {
+ Device *d, *l;
+
+ manager_dispatch_load_queue(m);
+
+ l = hashmap_get(m->devices_by_sysfs, sysfs);
+ LIST_FOREACH(same_sysfs, d, l)
+ device_set_state(d, DEVICE_PLUGGED);
+ }
+
+ return 0;
+}
+
static int device_process_path(Manager *m, const char *path, bool update_state) {
int r;
struct udev_device *dev;
static int device_process_removed_device(Manager *m, struct udev_device *dev) {
const char *sysfs;
- char *e;
- Unit *u;
Device *d;
assert(m);
if (!(sysfs = udev_device_get_syspath(dev)))
return -ENOMEM;
- assert(sysfs[0] == '/');
- if (!(e = unit_name_from_path(sysfs, ".device")))
- return -ENOMEM;
+ /* Remove all units of this sysfs path */
+ while ((d = hashmap_get(m->devices_by_sysfs, sysfs))) {
+ device_unset_sysfs(d);
+ device_set_state(d, DEVICE_DEAD);
+ }
- u = manager_get_unit(m, e);
- free(e);
+ return 0;
+}
+
+static Unit *device_following(Unit *u) {
+ Device *d = DEVICE(u);
+ Device *other, *first = NULL;
+
+ assert(d);
+
+ if (startswith(u->meta.id, "sys-"))
+ return NULL;
- if (!u)
+ /* Make everybody follow the unit that's named after the sysfs path */
+ for (other = d->same_sysfs_next; other; other = other->same_sysfs_next)
+ if (startswith(other->meta.id, "sys-"))
+ return UNIT(other);
+
+ for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev) {
+ if (startswith(other->meta.id, "sys-"))
+ return UNIT(other);
+
+ first = other;
+ }
+
+ return UNIT(first);
+}
+
+static int device_following_set(Unit *u, Set **_s) {
+ Device *d = DEVICE(u);
+ Device *other;
+ Set *s;
+ int r;
+
+ assert(d);
+ assert(_s);
+
+ if (!d->same_sysfs_prev && !d->same_sysfs_next) {
+ *_s = NULL;
return 0;
+ }
- d = DEVICE(u);
- free(d->sysfs);
- d->sysfs = NULL;
+ if (!(s = set_new(NULL, NULL)))
+ return -ENOMEM;
- device_set_state(d, DEVICE_DEAD);
- return 0;
+ for (other = d->same_sysfs_next; other; other = other->same_sysfs_next)
+ if ((r = set_put(s, other)) < 0)
+ goto fail;
+
+ for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev)
+ if ((r = set_put(s, other)) < 0)
+ goto fail;
+
+ *_s = s;
+ return 1;
+
+fail:
+ set_free(s);
+ return r;
}
static void device_shutdown(Manager *m) {
udev_unref(m->udev);
m->udev = NULL;
}
+
+ hashmap_free(m->devices_by_sysfs);
+ m->devices_by_sysfs = NULL;
}
static int device_enumerate(Manager *m) {
goto fail;
}
+ if (udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024) < 0)
+ log_error("Failed to set udev event buffer size.");
+
if (udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd") < 0) {
r = -ENOMEM;
goto fail;
const char *action;
assert(m);
- assert(events == EPOLLIN);
+
+ if (events != EPOLLIN) {
+ static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5);
+
+ if (!ratelimit_test(&limit))
+ log_error("Failed to get udev event: %m");
+ if (!(events & EPOLLIN))
+ return;
+ }
if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
- log_error("Failed to receive device.");
+ /*
+ * libudev might filter-out devices which pass the bloom filter,
+ * so getting NULL here is not neccessarily an error
+ */
return;
}
static const char* const device_state_table[_DEVICE_STATE_MAX] = {
[DEVICE_DEAD] = "dead",
- [DEVICE_AVAILABLE] = "available"
+ [DEVICE_PLUGGED] = "plugged"
};
DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);
const UnitVTable device_vtable = {
.suffix = ".device",
- .no_requires = true,
.no_instances = true,
.no_snapshots = true,
.no_isolate = true,
+ .init = device_init,
+
.load = unit_load_fragment_and_dropin_optional,
.done = device_done,
.coldplug = device_coldplug,
.active_state = device_active_state,
.sub_state_to_string = device_sub_state_to_string,
+ .bus_interface = "org.freedesktop.systemd1.Device",
.bus_message_handler = bus_device_message_handler,
+ .bus_invalidating_properties = bus_device_invalidating_properties,
+
+ .following = device_following,
+ .following_set = device_following_set,
.enumerate = device_enumerate,
.shutdown = device_shutdown
~ianmdlvl / elogind.git / blobdiff