+++ /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 Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser 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 "log.h"
-#include "unit-name.h"
-#include "dbus-device.h"
-#include "path-util.h"
-#include "udev-util.h"
-#include "unit.h"
-#include "swap.h"
-#include "device.h"
-
-static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
- [DEVICE_DEAD] = UNIT_INACTIVE,
- [DEVICE_TENTATIVE] = UNIT_ACTIVATING,
- [DEVICE_PLUGGED] = UNIT_ACTIVE,
-};
-
-static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
-
-static void device_unset_sysfs(Device *d) {
- Hashmap *devices;
- Device *first;
-
- assert(d);
-
- if (!d->sysfs)
- return;
-
- /* Remove this unit from the chain of devices which share the
- * same sysfs path. */
- devices = UNIT(d)->manager->devices_by_sysfs;
- first = hashmap_get(devices, d->sysfs);
- LIST_REMOVE(same_sysfs, first, d);
-
- if (first)
- hashmap_remove_and_replace(devices, d->sysfs, first->sysfs, first);
- else
- hashmap_remove(devices, d->sysfs);
-
- free(d->sysfs);
- d->sysfs = NULL;
-}
-
-static int device_set_sysfs(Device *d, const char *sysfs) {
- Device *first;
- char *copy;
- int r;
-
- assert(d);
-
- if (streq_ptr(d->sysfs, sysfs))
- return 0;
-
- r = hashmap_ensure_allocated(&UNIT(d)->manager->devices_by_sysfs, &string_hash_ops);
- if (r < 0)
- return r;
-
- copy = strdup(sysfs);
- if (!copy)
- return -ENOMEM;
-
- device_unset_sysfs(d);
-
- first = hashmap_get(UNIT(d)->manager->devices_by_sysfs, sysfs);
- LIST_PREPEND(same_sysfs, first, d);
-
- r = hashmap_replace(UNIT(d)->manager->devices_by_sysfs, copy, first);
- if (r < 0) {
- LIST_REMOVE(same_sysfs, first, d);
- free(copy);
- return r;
- }
-
- d->sysfs = copy;
-
- return 0;
-}
-
-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. */
- u->job_timeout = u->manager->default_timeout_start_usec;
-
- u->ignore_on_isolate = true;
- u->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_unit_debug(UNIT(d)->id,
- "%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, Hashmap *deferred_work) {
- Device *d = DEVICE(u);
-
- assert(d);
- assert(d->state == DEVICE_DEAD);
-
- if (d->found & DEVICE_FOUND_UDEV)
- /* If udev says the device is around, it's around */
- device_set_state(d, DEVICE_PLUGGED);
- else if (d->found != DEVICE_NOT_FOUND)
- /* If a device is found in /proc/self/mountinfo or
- * /proc/swaps, it's "tentatively" around. */
- device_set_state(d, DEVICE_TENTATIVE);
-
- 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));
-}
-
-_pure_ static UnitActiveState device_active_state(Unit *u) {
- assert(u);
-
- return state_translation_table[DEVICE(u)->state];
-}
-
-_pure_ static const char *device_sub_state_to_string(Unit *u) {
- assert(u);
-
- return device_state_to_string(DEVICE(u)->state);
-}
-
-static int device_update_description(Unit *u, struct udev_device *dev, const char *path) {
- const char *model;
- int r;
-
- assert(u);
- assert(dev);
- assert(path);
-
- model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE");
- if (!model)
- model = udev_device_get_property_value(dev, "ID_MODEL");
-
- if (model) {
- const char *label;
-
- /* Try to concatenate the device model string with a label, if there is one */
- label = udev_device_get_property_value(dev, "ID_FS_LABEL");
- if (!label)
- label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NAME");
- if (!label)
- label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NUMBER");
-
- if (label) {
- _cleanup_free_ char *j;
-
- j = strjoin(model, " ", label, NULL);
- if (j)
- r = unit_set_description(u, j);
- else
- r = -ENOMEM;
- } else
- r = unit_set_description(u, model);
- } else
- r = unit_set_description(u, path);
-
- if (r < 0)
- log_unit_error_errno(u->id, r, "Failed to set device description: %m");
-
- return r;
-}
-
-static int device_add_udev_wants(Unit *u, struct udev_device *dev) {
- const char *wants;
- const char *word, *state;
- size_t l;
- int r;
- const char *property;
-
- assert(u);
- assert(dev);
-
- property = u->manager->running_as == SYSTEMD_USER ? "SYSTEMD_USER_WANTS" : "SYSTEMD_WANTS";
- wants = udev_device_get_property_value(dev, property);
- if (!wants)
- return 0;
-
- FOREACH_WORD_QUOTED(word, l, wants, state) {
- _cleanup_free_ char *n = NULL;
- char e[l+1];
-
- memcpy(e, word, l);
- e[l] = 0;
-
- n = unit_name_mangle(e, MANGLE_NOGLOB);
- if (!n)
- return log_oom();
-
- r = unit_add_dependency_by_name(u, UNIT_WANTS, n, NULL, true);
- if (r < 0)
- return log_unit_error_errno(u->id, r, "Failed to add wants dependency: %m");
- }
- if (!isempty(state))
- log_unit_warning(u->id, "Property %s on %s has trailing garbage, ignoring.", property, strna(udev_device_get_syspath(dev)));
-
- return 0;
-}
-
-static int device_setup_unit(Manager *m, struct udev_device *dev, const char *path, bool main) {
- _cleanup_free_ char *e = NULL;
- const char *sysfs;
- Unit *u = NULL;
- bool delete;
- int r;
-
- assert(m);
- assert(dev);
- assert(path);
-
- sysfs = udev_device_get_syspath(dev);
- if (!sysfs)
- return 0;
-
- e = unit_name_from_path(path, ".device");
- if (!e)
- return log_oom();
-
- u = manager_get_unit(m, e);
-
- if (u &&
- DEVICE(u)->sysfs &&
- !path_equal(DEVICE(u)->sysfs, sysfs)) {
- log_unit_error(u->id, "Device %s appeared twice with different sysfs paths %s and %s", e, DEVICE(u)->sysfs, sysfs);
- return -EEXIST;
- }
-
- if (!u) {
- delete = true;
-
- u = unit_new(m, sizeof(Device));
- if (!u)
- return log_oom();
-
- r = unit_add_name(u, e);
- 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. */
-
- r = device_set_sysfs(DEVICE(u), sysfs);
- if (r < 0)
- goto fail;
-
- (void) device_update_description(u, dev, path);
-
- /* The additional systemd udev properties we only interpret
- * for the main object */
- if (main)
- (void) device_add_udev_wants(u, dev);
-
- /* Note that this won't dispatch the load queue, the caller
- * has to do that if needed and appropriate */
-
- unit_add_to_dbus_queue(u);
- return 0;
-
-fail:
- log_unit_warning_errno(u->id, r, "Failed to set up device unit: %m");
-
- if (delete && u)
- unit_free(u);
-
- return r;
-}
-
-static int device_process_new(Manager *m, struct udev_device *dev) {
- const char *sysfs, *dn, *alias;
- struct udev_list_entry *item = NULL, *first = NULL;
- int r;
-
- assert(m);
-
- sysfs = udev_device_get_syspath(dev);
- if (!sysfs)
- return 0;
-
- /* Add the main unit named after the sysfs path */
- r = device_setup_unit(m, dev, sysfs, true);
- if (r < 0)
- return r;
-
- /* Add an additional unit for the device node */
- dn = udev_device_get_devnode(dev);
- if (dn)
- (void) device_setup_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;
-
- (void) device_setup_unit(m, dev, p, false);
- }
-
- /* Add additional units for all explicitly configured
- * aliases */
- alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS");
- if (alias) {
- const char *word, *state;
- size_t l;
-
- FOREACH_WORD_QUOTED(word, l, alias, state) {
- char e[l+1];
-
- memcpy(e, word, l);
- e[l] = 0;
-
- if (path_is_absolute(e))
- (void) device_setup_unit(m, dev, e, false);
- else
- log_warning("SYSTEMD_ALIAS for %s is not an absolute path, ignoring: %s", sysfs, e);
- }
- if (!isempty(state))
- log_warning("SYSTEMD_ALIAS for %s has trailing garbage, ignoring.", sysfs);
- }
-
- return 0;
-}
-
-static void device_update_found_one(Device *d, bool add, DeviceFound found, bool now) {
- DeviceFound n;
-
- assert(d);
-
- n = add ? (d->found | found) : (d->found & ~found);
- if (n == d->found)
- return;
-
- d->found = n;
-
- if (now) {
- if (d->found & DEVICE_FOUND_UDEV)
- device_set_state(d, DEVICE_PLUGGED);
- else if (add && d->found != DEVICE_NOT_FOUND)
- device_set_state(d, DEVICE_TENTATIVE);
- else
- device_set_state(d, DEVICE_DEAD);
- }
-}
-
-static int device_update_found_by_sysfs(Manager *m, const char *sysfs, bool add, DeviceFound found, bool now) {
- Device *d, *l;
-
- assert(m);
- assert(sysfs);
-
- if (found == DEVICE_NOT_FOUND)
- return 0;
-
- l = hashmap_get(m->devices_by_sysfs, sysfs);
- LIST_FOREACH(same_sysfs, d, l)
- device_update_found_one(d, add, found, now);
-
- return 0;
-}
-
-static int device_update_found_by_name(Manager *m, const char *path, bool add, DeviceFound found, bool now) {
- _cleanup_free_ char *e = NULL;
- Unit *u;
-
- assert(m);
- assert(path);
-
- if (found == DEVICE_NOT_FOUND)
- return 0;
-
- e = unit_name_from_path(path, ".device");
- if (!e)
- return log_oom();
-
- u = manager_get_unit(m, e);
- if (!u)
- return 0;
-
- device_update_found_one(DEVICE(u), add, found, now);
- return 0;
-}
-
-static bool device_is_ready(struct udev_device *dev) {
- const char *ready;
-
- assert(dev);
-
- ready = udev_device_get_property_value(dev, "SYSTEMD_READY");
- if (!ready)
- return true;
-
- return parse_boolean(ready) != 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 **_set) {
- Device *d = DEVICE(u), *other;
- Set *set;
- int r;
-
- assert(d);
- assert(_set);
-
- if (LIST_JUST_US(same_sysfs, d)) {
- *_set = NULL;
- return 0;
- }
-
- set = set_new(NULL);
- if (!set)
- return -ENOMEM;
-
- LIST_FOREACH_AFTER(same_sysfs, other, d) {
- r = set_put(set, other);
- if (r < 0)
- goto fail;
- }
-
- LIST_FOREACH_BEFORE(same_sysfs, other, d) {
- r = set_put(set, other);
- if (r < 0)
- goto fail;
- }
-
- *_set = set;
- return 1;
-
-fail:
- set_free(set);
- return r;
-}
-
-static void device_shutdown(Manager *m) {
- assert(m);
-
- m->udev_event_source = sd_event_source_unref(m->udev_event_source);
-
- if (m->udev_monitor) {
- udev_monitor_unref(m->udev_monitor);
- m->udev_monitor = NULL;
- }
-
- hashmap_free(m->devices_by_sysfs);
- m->devices_by_sysfs = NULL;
-}
-
-static int device_enumerate(Manager *m) {
- _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
- struct udev_list_entry *item = NULL, *first = NULL;
- int r;
-
- assert(m);
-
- if (!m->udev_monitor) {
- m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
- if (!m->udev_monitor) {
- 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. */
- (void) udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024);
-
- r = udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd");
- if (r < 0)
- goto fail;
-
- r = udev_monitor_enable_receiving(m->udev_monitor);
- if (r < 0)
- goto fail;
-
- r = sd_event_add_io(m->event, &m->udev_event_source, udev_monitor_get_fd(m->udev_monitor), EPOLLIN, device_dispatch_io, m);
- if (r < 0)
- goto fail;
- }
-
- e = udev_enumerate_new(m->udev);
- if (!e) {
- r = -ENOMEM;
- goto fail;
- }
-
- r = udev_enumerate_add_match_tag(e, "systemd");
- if (r < 0)
- goto fail;
-
- r = udev_enumerate_add_match_is_initialized(e);
- if (r < 0)
- goto fail;
-
- r = udev_enumerate_scan_devices(e);
- if (r < 0)
- goto fail;
-
- first = udev_enumerate_get_list_entry(e);
- udev_list_entry_foreach(item, first) {
- _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
- const char *sysfs;
-
- sysfs = udev_list_entry_get_name(item);
-
- dev = udev_device_new_from_syspath(m->udev, sysfs);
- if (!dev) {
- log_oom();
- continue;
- }
-
- if (!device_is_ready(dev))
- continue;
-
- (void) device_process_new(m, dev);
-
- device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, false);
- }
-
- return 0;
-
-fail:
- log_error_errno(r, "Failed to enumerate devices: %m");
-
- device_shutdown(m);
- return r;
-}
-
-static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
- _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
- Manager *m = userdata;
- const char *action, *sysfs;
- int r;
-
- assert(m);
-
- if (revents != EPOLLIN) {
- static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5);
-
- if (!ratelimit_test(&limit))
- log_error_errno(errno, "Failed to get udev event: %m");
- if (!(revents & EPOLLIN))
- return 0;
- }
-
- /*
- * libudev might filter-out devices which pass the bloom
- * filter, so getting NULL here is not necessarily an error.
- */
- dev = udev_monitor_receive_device(m->udev_monitor);
- if (!dev)
- return 0;
-
- sysfs = udev_device_get_syspath(dev);
- if (!sysfs) {
- log_error("Failed to get udev sys path.");
- return 0;
- }
-
- action = udev_device_get_action(dev);
- if (!action) {
- log_error("Failed to get udev action string.");
- return 0;
- }
-
- if (streq(action, "remove")) {
- r = swap_process_device_remove(m, dev);
- if (r < 0)
- log_error_errno(r, "Failed to process swap device remove event: %m");
-
- /* If we get notified that a device was removed by
- * udev, then it's completely gone, hence unset all
- * found bits */
- device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP, true);
-
- } else if (device_is_ready(dev)) {
-
- (void) device_process_new(m, dev);
-
- r = swap_process_device_new(m, dev);
- if (r < 0)
- log_error_errno(r, "Failed to process swap device new event: %m");
-
- manager_dispatch_load_queue(m);
-
- /* The device is found now, set the udev found bit */
- device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, true);
-
- } else {
- /* The device is nominally around, but not ready for
- * us. Hence unset the udev bit, but leave the rest
- * around. */
-
- device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV, true);
- }
-
- return 0;
-}
-
-static bool device_supported(Manager *m) {
- static int read_only = -1;
- assert(m);
-
- /* If /sys is read-only we don't support device units, and any
- * attempts to start one should fail immediately. */
-
- if (read_only < 0)
- read_only = path_is_read_only_fs("/sys");
-
- return read_only <= 0;
-}
-
-int device_found_node(Manager *m, const char *node, bool add, DeviceFound found, bool now) {
- _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
- struct stat st;
-
- assert(m);
- assert(node);
-
- /* This is called whenever we find a device referenced in
- * /proc/swaps or /proc/self/mounts. Such a device might be
- * mounted/enabled at a time where udev has not finished
- * probing it yet, and we thus haven't learned about it
- * yet. In this case we will set the device unit to
- * "tentative" state. */
-
- if (add) {
- if (!path_startswith(node, "/dev"))
- return 0;
-
- if (stat(node, &st) < 0) {
- if (errno == ENOENT)
- return 0;
-
- return log_error_errno(errno, "Failed to stat device node file %s: %m", node);
- }
-
- if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode))
- return 0;
-
- dev = udev_device_new_from_devnum(m->udev, S_ISBLK(st.st_mode) ? 'b' : 'c', st.st_rdev);
- if (!dev) {
- if (errno == ENOENT)
- return 0;
-
- return log_oom();
- }
-
- /* If the device is known in the kernel and newly
- * appeared, then we'll create a device unit for it,
- * under the name referenced in /proc/swaps or
- * /proc/self/mountinfo. */
-
- (void) device_setup_unit(m, dev, node, false);
- }
-
- /* Update the device unit's state, should it exist */
- return device_update_found_by_name(m, node, add, found, now);
-}
-
-static const char* const device_state_table[_DEVICE_STATE_MAX] = {
- [DEVICE_DEAD] = "dead",
- [DEVICE_TENTATIVE] = "tentative",
- [DEVICE_PLUGGED] = "plugged",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);
-
-const UnitVTable device_vtable = {
- .object_size = sizeof(Device),
- .sections =
- "Unit\0"
- "Device\0"
- "Install\0",
-
- .no_instances = true,
-
- .init = device_init,
- .done = device_done,
- .load = unit_load_fragment_and_dropin_optional,
-
- .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_vtable = bus_device_vtable,
-
- .following = device_following,
- .following_set = device_following_set,
-
- .enumerate = device_enumerate,
- .shutdown = device_shutdown,
- .supported = device_supported,
-
- .status_message_formats = {
- .starting_stopping = {
- [0] = "Expecting device %s...",
- },
- .finished_start_job = {
- [JOB_DONE] = "Found device %s.",
- [JOB_TIMEOUT] = "Timed out waiting for device %s.",
- },
- },
-};
~ianmdlvl / elogind.git / blobdiff