+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <errno.h>
-#include <sys/epoll.h>
-#include <libudev.h>
-
-#include "unit.h"
-#include "device.h"
-#include "strv.h"
-#include "log.h"
-#include "unit-name.h"
-#include "dbus-device.h"
-#include "def.h"
-
-static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
- [DEVICE_DEAD] = UNIT_INACTIVE,
- [DEVICE_PLUGGED] = UNIT_ACTIVE
-};
-
-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(UNIT(d)->manager->devices_by_sysfs, d->sysfs);
- LIST_REMOVE(Device, same_sysfs, first, d);
-
- if (first)
- hashmap_remove_and_replace(UNIT(d)->manager->devices_by_sysfs, d->sysfs, first->sysfs, first);
- else
- hashmap_remove(UNIT(d)->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(UNIT(d)->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
- * indefinitely for plugged in devices, something which cannot
- * happen for the other units since their operations time out
- * anyway. */
- UNIT(d)->job_timeout = DEFAULT_TIMEOUT_USEC;
-
- UNIT(d)->ignore_on_isolate = true;
- UNIT(d)->ignore_on_snapshot = true;
-}
-
-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);
-
- old_state = d->state;
- d->state = state;
-
- if (state != old_state)
- log_debug("%s changed %s -> %s",
- UNIT(d)->id,
- device_state_to_string(old_state),
- device_state_to_string(state));
-
- unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state], true);
-}
-
-static int device_coldplug(Unit *u) {
- Device *d = DEVICE(u);
-
- assert(d);
- assert(d->state == DEVICE_DEAD);
-
- if (d->sysfs)
- device_set_state(d, DEVICE_PLUGGED);
-
- return 0;
-}
-
-static void device_dump(Unit *u, FILE *f, const char *prefix) {
- Device *d = DEVICE(u);
-
- assert(d);
-
- fprintf(f,
- "%sDevice State: %s\n"
- "%sSysfs Path: %s\n",
- prefix, device_state_to_string(d->state),
- prefix, strna(d->sysfs));
-}
-
-static UnitActiveState device_active_state(Unit *u) {
- assert(u);
-
- return state_translation_table[DEVICE(u)->state];
-}
-
-static const char *device_sub_state_to_string(Unit *u) {
- assert(u);
-
- return device_state_to_string(DEVICE(u)->state);
-}
-
-static int device_add_escaped_name(Unit *u, const char *dn) {
- char *e;
- int r;
-
- assert(u);
- assert(dn);
- assert(dn[0] == '/');
-
- if (!(e = unit_name_from_path(dn, ".device")))
- return -ENOMEM;
-
- r = unit_add_name(u, e);
- free(e);
-
- if (r < 0 && r != -EEXIST)
- return r;
-
- return 0;
-}
-
-static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) {
- char *e;
- Unit *u;
-
- assert(m);
- assert(dn);
- assert(dn[0] == '/');
- assert(_u);
-
- if (!(e = unit_name_from_path(dn, ".device")))
- return -ENOMEM;
-
- u = manager_get_unit(m, e);
- free(e);
-
- if (u) {
- *_u = u;
- return 1;
- }
-
- return 0;
-}
-
-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;
- bool delete;
-
- assert(m);
-
- if (!(sysfs = udev_device_get_syspath(dev)))
- return -ENOMEM;
-
- if ((r = device_find_escape_name(m, path, &u)) < 0)
- return r;
-
- if (u && DEVICE(u)->sysfs && !path_equal(DEVICE(u)->sysfs, sysfs))
- return -EEXIST;
-
- if (!u) {
- delete = true;
-
- u = unit_new(m, sizeof(Device));
- if (!u)
- return -ENOMEM;
-
- r = device_add_escaped_name(u, path);
- if (r < 0)
- goto fail;
-
- unit_add_to_load_queue(u);
- } else
- delete = false;
-
- /* 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 (!m->devices_by_sysfs)
- if (!(m->devices_by_sysfs = hashmap_new(string_hash_func, string_compare_func))) {
- r = -ENOMEM;
- goto fail;
- }
-
- first = hashmap_get(m->devices_by_sysfs, sysfs);
- LIST_PREPEND(Device, same_sysfs, first, DEVICE(u));
-
- 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 ((r = unit_set_description(u, path)) < 0)
- 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;
- }
- }
-
- if ((wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS"))) {
- char *state, *w;
- size_t l;
-
- FOREACH_WORD_QUOTED(w, l, wants, state) {
- char *e;
-
- 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)
- unit_free(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;
-
- assert(m);
- assert(path);
-
- if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
- log_warning("Failed to get udev device object from udev for path %s.", path);
- return -ENOMEM;
- }
-
- r = device_process_new_device(m, dev, update_state);
- udev_device_unref(dev);
- return r;
-}
-
-static int device_process_removed_device(Manager *m, struct udev_device *dev) {
- const char *sysfs;
- Device *d;
-
- assert(m);
- assert(dev);
-
- if (!(sysfs = udev_device_get_syspath(dev)))
- 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);
- }
-
- return 0;
-}
-
-static Unit *device_following(Unit *u) {
- Device *d = DEVICE(u);
- Device *other, *first = NULL;
-
- assert(d);
-
- if (startswith(u->id, "sys-"))
- return NULL;
-
- /* 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(UNIT(other)->id, "sys-"))
- return UNIT(other);
-
- for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev) {
- if (startswith(UNIT(other)->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;
- }
-
- if (!(s = set_new(NULL, NULL)))
- return -ENOMEM;
-
- 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) {
- assert(m);
-
- if (m->udev_monitor) {
- udev_monitor_unref(m->udev_monitor);
- m->udev_monitor = NULL;
- }
-
- if (m->udev) {
- udev_unref(m->udev);
- m->udev = NULL;
- }
-
- hashmap_free(m->devices_by_sysfs);
- m->devices_by_sysfs = NULL;
-}
-
-static int device_enumerate(Manager *m) {
- struct epoll_event ev;
- int r;
- struct udev_enumerate *e = NULL;
- struct udev_list_entry *item = NULL, *first = NULL;
-
- assert(m);
-
- if (!m->udev) {
- if (!(m->udev = udev_new()))
- return -ENOMEM;
-
- if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
- r = -ENOMEM;
- goto fail;
- }
-
- /* This will fail if we are unprivileged, but that
- * should not matter much, as user instances won't run
- * during boot. */
- udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024);
-
- if (udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd") < 0) {
- r = -ENOMEM;
- goto fail;
- }
-
- if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
- r = -EIO;
- goto fail;
- }
-
- m->udev_watch.type = WATCH_UDEV;
- m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
-
- zero(ev);
- ev.events = EPOLLIN;
- ev.data.ptr = &m->udev_watch;
-
- if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
- return -errno;
- }
-
- if (!(e = udev_enumerate_new(m->udev))) {
- r = -ENOMEM;
- goto fail;
- }
- if (udev_enumerate_add_match_tag(e, "systemd") < 0) {
- r = -EIO;
- goto fail;
- }
-
- if (udev_enumerate_scan_devices(e) < 0) {
- r = -EIO;
- goto fail;
- }
-
- first = udev_enumerate_get_list_entry(e);
- udev_list_entry_foreach(item, first)
- device_process_path(m, udev_list_entry_get_name(item), false);
-
- udev_enumerate_unref(e);
- return 0;
-
-fail:
- if (e)
- udev_enumerate_unref(e);
-
- device_shutdown(m);
- return r;
-}
-
-void device_fd_event(Manager *m, int events) {
- struct udev_device *dev;
- int r;
- const char *action, *ready;
-
- assert(m);
-
- 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))) {
- /*
- * libudev might filter-out devices which pass the bloom filter,
- * so getting NULL here is not necessarily an error
- */
- return;
- }
-
- if (!(action = udev_device_get_action(dev))) {
- log_error("Failed to get udev action string.");
- goto fail;
- }
-
- ready = udev_device_get_property_value(dev, "SYSTEMD_READY");
-
- if (streq(action, "remove") || (ready && parse_boolean(ready) == 0)) {
- if ((r = device_process_removed_device(m, dev)) < 0) {
- log_error("Failed to process udev device event: %s", strerror(-r));
- goto fail;
- }
- } else {
- if ((r = device_process_new_device(m, dev, true)) < 0) {
- log_error("Failed to process udev device event: %s", strerror(-r));
- goto fail;
- }
- }
-
-fail:
- udev_device_unref(dev);
-}
-
-static const char* const device_state_table[_DEVICE_STATE_MAX] = {
- [DEVICE_DEAD] = "dead",
- [DEVICE_PLUGGED] = "plugged"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);
-
-const UnitVTable device_vtable = {
- .suffix = ".device",
- .object_size = sizeof(Device),
- .sections =
- "Unit\0"
- "Device\0"
- "Install\0",
-
- .no_instances = true,
-
- .init = device_init,
-
- .load = unit_load_fragment_and_dropin_optional,
- .done = device_done,
- .coldplug = device_coldplug,
-
- .dump = device_dump,
-
- .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