8fe914ec81
Don't try to merge devices that have been created via dependencies when they appear in the system and can be recognized as the same. Instead, simply continue to maintain them independently of each other, however with the same state cycle. Why? Because otherwise we'd have a hard time to seperate the dependencies after the devices are unplugged again and we hence cannot be sure anymore that next time the device is plugged in it will carry the same names. Example: if one depndency refers to dev-sda.device and another one to dev-by-id-xxxyyy.device we only learn at time of plug in of the device that it is actually the same device that was ment. In the moment the device is unplugged again we won't know anymore their relation to each other and the next time the harddisk is plugged it might even appear as dev-by-id-xxxyyy.device and dev-sdb.service. To ensure the dependencies continue to have the meaning they were intended to have let's hence keep the .device objects seperate all the time, even when they are plugged in. This patch also introduces a new Following= property which points from the various .device units of a specific device to the main .device unit for it. This can be used by the client side to figure out the relation of the .device units to each other and even filter units from display.
518 lines
15 KiB
C
518 lines
15 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <sys/epoll.h>
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#include <libudev.h>
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#include "unit.h"
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#include "device.h"
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#include "strv.h"
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#include "log.h"
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#include "unit-name.h"
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#include "dbus-device.h"
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static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
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[DEVICE_DEAD] = UNIT_INACTIVE,
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[DEVICE_PLUGGED] = UNIT_ACTIVE
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};
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static void device_unset_sysfs(Device *d) {
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Device *first;
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assert(d);
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if (d->sysfs) {
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/* Remove this unit from the chain of devices which share the
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* same sysfs path. */
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first = hashmap_get(d->meta.manager->devices_by_sysfs, d->sysfs);
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LIST_REMOVE(Device, same_sysfs, first, d);
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if (first)
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hashmap_remove_and_replace(d->meta.manager->devices_by_sysfs, d->sysfs, first->sysfs, first);
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else
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hashmap_remove(d->meta.manager->devices_by_sysfs, d->sysfs);
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free(d->sysfs);
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d->sysfs = NULL;
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}
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d->meta.following = NULL;
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}
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static void device_init(Unit *u) {
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Device *d = DEVICE(u);
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assert(d);
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assert(d->meta.load_state == UNIT_STUB);
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/* In contrast to all other unit types we timeout jobs waiting
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* for devices by default. This is because they otherwise wait
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* indefinetely for plugged in devices, something which cannot
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* happen for the other units since their operations time out
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* anyway. */
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d->meta.job_timeout = DEFAULT_TIMEOUT_USEC;
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}
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static void device_done(Unit *u) {
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Device *d = DEVICE(u);
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assert(d);
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device_unset_sysfs(d);
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}
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static void device_set_state(Device *d, DeviceState state) {
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DeviceState old_state;
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assert(d);
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old_state = d->state;
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d->state = state;
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if (state != old_state)
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log_debug("%s changed %s -> %s",
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d->meta.id,
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device_state_to_string(old_state),
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device_state_to_string(state));
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unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
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}
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static int device_coldplug(Unit *u) {
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Device *d = DEVICE(u);
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assert(d);
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assert(d->state == DEVICE_DEAD);
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if (d->sysfs)
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device_set_state(d, DEVICE_PLUGGED);
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return 0;
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}
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static void device_dump(Unit *u, FILE *f, const char *prefix) {
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Device *d = DEVICE(u);
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assert(d);
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fprintf(f,
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"%sDevice State: %s\n"
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"%sSysfs Path: %s\n",
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prefix, device_state_to_string(d->state),
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prefix, strna(d->sysfs));
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}
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static UnitActiveState device_active_state(Unit *u) {
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assert(u);
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return state_translation_table[DEVICE(u)->state];
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}
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static const char *device_sub_state_to_string(Unit *u) {
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assert(u);
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return device_state_to_string(DEVICE(u)->state);
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}
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static int device_add_escaped_name(Unit *u, const char *dn) {
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char *e;
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int r;
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assert(u);
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assert(dn);
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assert(dn[0] == '/');
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if (!(e = unit_name_from_path(dn, ".device")))
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return -ENOMEM;
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r = unit_add_name(u, e);
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free(e);
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if (r < 0 && r != -EEXIST)
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return r;
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return 0;
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}
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static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) {
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char *e;
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Unit *u;
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assert(m);
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assert(dn);
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assert(dn[0] == '/');
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assert(_u);
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if (!(e = unit_name_from_path(dn, ".device")))
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return -ENOMEM;
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u = manager_get_unit(m, e);
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free(e);
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if (u) {
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*_u = u;
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return 1;
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}
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return 0;
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}
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static int device_update_unit(Manager *m, struct udev_device *dev, const char *path, bool main) {
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const char *sysfs, *model;
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Unit *u = NULL;
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int r;
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bool delete;
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assert(m);
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if (!(sysfs = udev_device_get_syspath(dev)))
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return -ENOMEM;
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if ((r = device_find_escape_name(m, path, &u)) < 0)
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return r;
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/* If this is a different unit, then let's not merge things */
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if (u && DEVICE(u)->sysfs && !path_equal(DEVICE(u)->sysfs, sysfs)) {
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log_error("Hmm, something's broken. Asked to create two devices with same name but different sysfs paths.");
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return -EEXIST;
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}
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if (!u) {
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Device *first;
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delete = true;
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if (!(u = unit_new(m)))
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return -ENOMEM;
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if ((r = device_add_escaped_name(u, path)) < 0)
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goto fail;
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if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
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r = -ENOMEM;
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goto fail;
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}
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unit_add_to_load_queue(u);
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if (!m->devices_by_sysfs)
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if (!(m->devices_by_sysfs = hashmap_new(string_hash_func, string_compare_func))) {
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r = -ENOMEM;
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goto fail;
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}
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first = hashmap_get(m->devices_by_sysfs, sysfs);
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LIST_PREPEND(Device, same_sysfs, first, DEVICE(u));
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if ((r = hashmap_replace(m->devices_by_sysfs, DEVICE(u)->sysfs, first)) < 0)
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goto fail;
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} else
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delete = false;
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if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
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(model = udev_device_get_property_value(dev, "ID_MODEL"))) {
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if ((r = unit_set_description(u, model)) < 0)
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goto fail;
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} else
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if ((r = unit_set_description(u, path)) < 0)
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goto fail;
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if (main) {
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/* The additional systemd udev properties we only
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* interpret for the main object */
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const char *wants, *alias;
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if ((alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS"))) {
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if (!is_path(alias))
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log_warning("SYSTEMD_ALIAS for %s is not a path, ignoring: %s", sysfs, alias);
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else {
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if ((r = device_add_escaped_name(u, alias)) < 0)
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goto fail;
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}
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}
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if ((wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS"))) {
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char *state, *w;
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size_t l;
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FOREACH_WORD_QUOTED(w, l, wants, state) {
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char *e;
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if (!(e = strndup(w, l))) {
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r = -ENOMEM;
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goto fail;
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}
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r = unit_add_dependency_by_name(u, UNIT_WANTS, e, NULL, true);
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free(e);
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if (r < 0)
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goto fail;
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}
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}
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u->meta.following = NULL;
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} else
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device_find_escape_name(m, sysfs, &u->meta.following);
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unit_add_to_dbus_queue(u);
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return 0;
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fail:
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log_warning("Failed to load device unit: %s", strerror(-r));
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if (delete && u)
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unit_free(u);
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return r;
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}
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static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
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const char *sysfs, *dn;
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struct udev_list_entry *item = NULL, *first = NULL;
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assert(m);
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if (!(sysfs = udev_device_get_syspath(dev)))
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return -ENOMEM;
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/* Add the main unit named after the sysfs path */
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device_update_unit(m, dev, sysfs, true);
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/* Add an additional unit for the device node */
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if ((dn = udev_device_get_devnode(dev)))
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device_update_unit(m, dev, dn, false);
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/* Add additional units for all symlinks */
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first = udev_device_get_devlinks_list_entry(dev);
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udev_list_entry_foreach(item, first) {
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const char *p;
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/* Don't bother with the /dev/block links */
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p = udev_list_entry_get_name(item);
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if (path_startswith(p, "/dev/block/") ||
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path_startswith(p, "/dev/char/"))
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continue;
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device_update_unit(m, dev, p, false);
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}
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if (update_state) {
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Device *d, *l;
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manager_dispatch_load_queue(m);
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l = hashmap_get(m->devices_by_sysfs, sysfs);
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LIST_FOREACH(same_sysfs, d, l)
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device_set_state(d, DEVICE_PLUGGED);
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}
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return 0;
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}
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static int device_process_path(Manager *m, const char *path, bool update_state) {
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int r;
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struct udev_device *dev;
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assert(m);
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assert(path);
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if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
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log_warning("Failed to get udev device object from udev for path %s.", path);
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return -ENOMEM;
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}
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r = device_process_new_device(m, dev, update_state);
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udev_device_unref(dev);
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return r;
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}
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static int device_process_removed_device(Manager *m, struct udev_device *dev) {
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const char *sysfs;
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Device *d;
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assert(m);
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assert(dev);
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if (!(sysfs = udev_device_get_syspath(dev)))
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return -ENOMEM;
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/* Remove all units of this sysfs path */
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while ((d = hashmap_get(m->devices_by_sysfs, sysfs))) {
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device_unset_sysfs(d);
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device_set_state(d, DEVICE_DEAD);
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}
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return 0;
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}
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static void device_shutdown(Manager *m) {
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assert(m);
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if (m->udev_monitor) {
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udev_monitor_unref(m->udev_monitor);
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m->udev_monitor = NULL;
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}
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if (m->udev) {
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udev_unref(m->udev);
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m->udev = NULL;
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}
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hashmap_free(m->devices_by_sysfs);
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m->devices_by_sysfs = NULL;
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}
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static int device_enumerate(Manager *m) {
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struct epoll_event ev;
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int r;
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struct udev_enumerate *e = NULL;
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struct udev_list_entry *item = NULL, *first = NULL;
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assert(m);
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if (!m->udev) {
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if (!(m->udev = udev_new()))
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return -ENOMEM;
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if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
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r = -ENOMEM;
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goto fail;
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}
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if (udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd") < 0) {
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r = -ENOMEM;
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goto fail;
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}
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if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
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r = -EIO;
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goto fail;
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}
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m->udev_watch.type = WATCH_UDEV;
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m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
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zero(ev);
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ev.events = EPOLLIN;
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ev.data.ptr = &m->udev_watch;
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if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
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return -errno;
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}
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if (!(e = udev_enumerate_new(m->udev))) {
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r = -ENOMEM;
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goto fail;
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}
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if (udev_enumerate_add_match_tag(e, "systemd") < 0) {
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r = -EIO;
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goto fail;
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}
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if (udev_enumerate_scan_devices(e) < 0) {
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r = -EIO;
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goto fail;
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}
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first = udev_enumerate_get_list_entry(e);
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udev_list_entry_foreach(item, first)
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device_process_path(m, udev_list_entry_get_name(item), false);
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udev_enumerate_unref(e);
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return 0;
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fail:
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if (e)
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udev_enumerate_unref(e);
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device_shutdown(m);
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return r;
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}
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void device_fd_event(Manager *m, int events) {
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struct udev_device *dev;
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int r;
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const char *action;
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assert(m);
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assert(events == EPOLLIN);
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if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
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log_error("Failed to receive device.");
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return;
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}
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if (!(action = udev_device_get_action(dev))) {
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log_error("Failed to get udev action string.");
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goto fail;
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}
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if (streq(action, "remove")) {
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if ((r = device_process_removed_device(m, dev)) < 0) {
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log_error("Failed to process udev device event: %s", strerror(-r));
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goto fail;
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}
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} else {
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if ((r = device_process_new_device(m, dev, true)) < 0) {
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log_error("Failed to process udev device event: %s", strerror(-r));
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goto fail;
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}
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}
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fail:
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udev_device_unref(dev);
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}
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static const char* const device_state_table[_DEVICE_STATE_MAX] = {
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[DEVICE_DEAD] = "dead",
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[DEVICE_PLUGGED] = "plugged"
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};
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DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);
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const UnitVTable device_vtable = {
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.suffix = ".device",
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.no_requires = true,
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.no_instances = true,
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.no_snapshots = true,
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.no_isolate = true,
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.no_alias = true,
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.init = device_init,
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.load = unit_load_fragment_and_dropin_optional,
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.done = device_done,
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.coldplug = device_coldplug,
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.dump = device_dump,
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.active_state = device_active_state,
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.sub_state_to_string = device_sub_state_to_string,
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.bus_message_handler = bus_device_message_handler,
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.enumerate = device_enumerate,
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.shutdown = device_shutdown
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};
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