diff options
Diffstat (limited to 'src/core/mount.c')
| -rw-r--r-- | src/core/mount.c | 1946 |
1 files changed, 0 insertions, 1946 deletions
diff --git a/src/core/mount.c b/src/core/mount.c deleted file mode 100644 index d749e49df5..0000000000 --- a/src/core/mount.c +++ /dev/null @@ -1,1946 +0,0 @@ -/*** - 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 <signal.h> -#include <stdio.h> -#include <sys/epoll.h> - -#include "sd-messages.h" - -#include "alloc-util.h" -#include "dbus-mount.h" -#include "escape.h" -#include "exit-status.h" -#include "formats-util.h" -#include "fstab-util.h" -#include "log.h" -#include "manager.h" -#include "mkdir.h" -#include "mount-setup.h" -#include "mount-util.h" -#include "mount.h" -#include "parse-util.h" -#include "path-util.h" -#include "process-util.h" -#include "special.h" -#include "string-table.h" -#include "string-util.h" -#include "strv.h" -#include "unit-name.h" -#include "unit.h" - -#define RETRY_UMOUNT_MAX 32 - -DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table); -DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter); - -static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = { - [MOUNT_DEAD] = UNIT_INACTIVE, - [MOUNT_MOUNTING] = UNIT_ACTIVATING, - [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE, - [MOUNT_MOUNTED] = UNIT_ACTIVE, - [MOUNT_REMOUNTING] = UNIT_RELOADING, - [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING, - [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING, - [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING, - [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING, - [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING, - [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING, - [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING, - [MOUNT_FAILED] = UNIT_FAILED -}; - -static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); -static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); - -static bool mount_needs_network(const char *options, const char *fstype) { - if (fstab_test_option(options, "_netdev\0")) - return true; - - if (fstype && fstype_is_network(fstype)) - return true; - - return false; -} - -static bool mount_is_network(const MountParameters *p) { - assert(p); - - return mount_needs_network(p->options, p->fstype); -} - -static bool mount_is_loop(const MountParameters *p) { - assert(p); - - if (fstab_test_option(p->options, "loop\0")) - return true; - - return false; -} - -static bool mount_is_bind(const MountParameters *p) { - assert(p); - - if (fstab_test_option(p->options, "bind\0" "rbind\0")) - return true; - - if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind")) - return true; - - return false; -} - -static bool mount_is_auto(const MountParameters *p) { - assert(p); - - return !fstab_test_option(p->options, "noauto\0"); -} - -static bool mount_is_automount(const MountParameters *p) { - assert(p); - - return fstab_test_option(p->options, - "comment=systemd.automount\0" - "x-systemd.automount\0"); -} - -static bool mount_state_active(MountState state) { - return IN_SET(state, - MOUNT_MOUNTING, - MOUNT_MOUNTING_DONE, - MOUNT_REMOUNTING, - MOUNT_UNMOUNTING, - MOUNT_MOUNTING_SIGTERM, - MOUNT_MOUNTING_SIGKILL, - MOUNT_UNMOUNTING_SIGTERM, - MOUNT_UNMOUNTING_SIGKILL, - MOUNT_REMOUNTING_SIGTERM, - MOUNT_REMOUNTING_SIGKILL); -} - -static bool needs_quota(const MountParameters *p) { - assert(p); - - /* Quotas are not enabled on network filesystems, - * but we want them, for example, on storage connected via iscsi */ - if (p->fstype && fstype_is_network(p->fstype)) - return false; - - if (mount_is_bind(p)) - return false; - - return fstab_test_option(p->options, - "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0"); -} - -static void mount_init(Unit *u) { - Mount *m = MOUNT(u); - - assert(u); - assert(u->load_state == UNIT_STUB); - - m->timeout_usec = u->manager->default_timeout_start_usec; - m->directory_mode = 0755; - - /* We need to make sure that /usr/bin/mount is always called - * in the same process group as us, so that the autofs kernel - * side doesn't send us another mount request while we are - * already trying to comply its last one. */ - m->exec_context.same_pgrp = true; - - m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; - - u->ignore_on_isolate = true; -} - -static int mount_arm_timer(Mount *m, usec_t usec) { - int r; - - assert(m); - - if (m->timer_event_source) { - r = sd_event_source_set_time(m->timer_event_source, usec); - if (r < 0) - return r; - - return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT); - } - - if (usec == USEC_INFINITY) - return 0; - - r = sd_event_add_time( - UNIT(m)->manager->event, - &m->timer_event_source, - CLOCK_MONOTONIC, - usec, 0, - mount_dispatch_timer, m); - if (r < 0) - return r; - - (void) sd_event_source_set_description(m->timer_event_source, "mount-timer"); - - return 0; -} - -static void mount_unwatch_control_pid(Mount *m) { - assert(m); - - if (m->control_pid <= 0) - return; - - unit_unwatch_pid(UNIT(m), m->control_pid); - m->control_pid = 0; -} - -static void mount_parameters_done(MountParameters *p) { - assert(p); - - free(p->what); - free(p->options); - free(p->fstype); - - p->what = p->options = p->fstype = NULL; -} - -static void mount_done(Unit *u) { - Mount *m = MOUNT(u); - - assert(m); - - m->where = mfree(m->where); - - mount_parameters_done(&m->parameters_proc_self_mountinfo); - mount_parameters_done(&m->parameters_fragment); - - m->exec_runtime = exec_runtime_unref(m->exec_runtime); - exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); - m->control_command = NULL; - - dynamic_creds_unref(&m->dynamic_creds); - - mount_unwatch_control_pid(m); - - m->timer_event_source = sd_event_source_unref(m->timer_event_source); -} - -_pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) { - assert(m); - - if (m->from_fragment) - return &m->parameters_fragment; - - return NULL; -} - -_pure_ static MountParameters* get_mount_parameters(Mount *m) { - assert(m); - - if (m->from_proc_self_mountinfo) - return &m->parameters_proc_self_mountinfo; - - return get_mount_parameters_fragment(m); -} - -static int mount_add_mount_links(Mount *m) { - _cleanup_free_ char *parent = NULL; - MountParameters *pm; - Unit *other; - Iterator i; - Set *s; - int r; - - assert(m); - - if (!path_equal(m->where, "/")) { - /* Adds in links to other mount points that might lie further - * up in the hierarchy */ - - parent = dirname_malloc(m->where); - if (!parent) - return -ENOMEM; - - r = unit_require_mounts_for(UNIT(m), parent); - if (r < 0) - return r; - } - - /* Adds in links to other mount points that might be needed - * for the source path (if this is a bind mount or a loop mount) to be - * available. */ - pm = get_mount_parameters_fragment(m); - if (pm && pm->what && - path_is_absolute(pm->what) && - (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) { - - r = unit_require_mounts_for(UNIT(m), pm->what); - if (r < 0) - return r; - } - - /* Adds in links to other units that use this path or paths - * further down in the hierarchy */ - s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where); - SET_FOREACH(other, s, i) { - - if (other->load_state != UNIT_LOADED) - continue; - - if (other == UNIT(m)) - continue; - - r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true); - if (r < 0) - return r; - - if (UNIT(m)->fragment_path) { - /* If we have fragment configuration, then make this dependency required */ - r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true); - if (r < 0) - return r; - } - } - - return 0; -} - -static int mount_add_device_links(Mount *m) { - MountParameters *p; - bool device_wants_mount = false; - int r; - - assert(m); - - p = get_mount_parameters(m); - if (!p) - return 0; - - if (!p->what) - return 0; - - if (mount_is_bind(p)) - return 0; - - if (!is_device_path(p->what)) - return 0; - - /* /dev/root is a really weird thing, it's not a real device, - * but just a path the kernel exports for the root file system - * specified on the kernel command line. Ignore it here. */ - if (path_equal(p->what, "/dev/root")) - return 0; - - if (path_equal(m->where, "/")) - return 0; - - if (mount_is_auto(p) && !mount_is_automount(p) && MANAGER_IS_SYSTEM(UNIT(m)->manager)) - device_wants_mount = true; - - r = unit_add_node_link(UNIT(m), p->what, device_wants_mount, m->from_fragment ? UNIT_BINDS_TO : UNIT_REQUIRES); - if (r < 0) - return r; - - return 0; -} - -static int mount_add_quota_links(Mount *m) { - int r; - MountParameters *p; - - assert(m); - - if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) - return 0; - - p = get_mount_parameters_fragment(m); - if (!p) - return 0; - - if (!needs_quota(p)) - return 0; - - r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true); - if (r < 0) - return r; - - r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true); - if (r < 0) - return r; - - return 0; -} - -static bool should_umount(Mount *m) { - MountParameters *p; - - if (PATH_IN_SET(m->where, "/", "/usr") || - path_startswith(m->where, "/run/initramfs")) - return false; - - p = get_mount_parameters(m); - if (p && fstab_test_option(p->options, "x-initrd.mount\0") && - !in_initrd()) - return false; - - return true; -} - -static int mount_add_default_dependencies(Mount *m) { - MountParameters *p; - const char *after; - int r; - - assert(m); - - if (!UNIT(m)->default_dependencies) - return 0; - - if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) - return 0; - - /* We do not add any default dependencies to /, /usr or - * /run/initramfs/, since they are guaranteed to stay - * mounted the whole time, since our system is on it. - * Also, don't bother with anything mounted below virtual - * file systems, it's also going to be virtual, and hence - * not worth the effort. */ - if (PATH_IN_SET(m->where, "/", "/usr") || - path_startswith(m->where, "/run/initramfs") || - path_startswith(m->where, "/proc") || - path_startswith(m->where, "/sys") || - path_startswith(m->where, "/dev")) - return 0; - - p = get_mount_parameters(m); - if (!p) - return 0; - - if (mount_is_network(p)) { - /* We order ourselves after network.target. This is - * primarily useful at shutdown: services that take - * down the network should order themselves before - * network.target, so that they are shut down only - * after this mount unit is stopped. */ - - r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, NULL, true); - if (r < 0) - return r; - - /* We pull in network-online.target, and order - * ourselves after it. This is useful at start-up to - * actively pull in tools that want to be started - * before we start mounting network file systems, and - * whose purpose it is to delay this until the network - * is "up". */ - - r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, NULL, true); - if (r < 0) - return r; - - after = SPECIAL_REMOTE_FS_PRE_TARGET; - } else - after = SPECIAL_LOCAL_FS_PRE_TARGET; - - r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true); - if (r < 0) - return r; - - if (should_umount(m)) { - r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); - if (r < 0) - return r; - } - - return 0; -} - -static int mount_verify(Mount *m) { - _cleanup_free_ char *e = NULL; - MountParameters *p; - int r; - - assert(m); - - if (UNIT(m)->load_state != UNIT_LOADED) - return 0; - - if (!m->from_fragment && !m->from_proc_self_mountinfo) - return -ENOENT; - - r = unit_name_from_path(m->where, ".mount", &e); - if (r < 0) - return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m"); - - if (!unit_has_name(UNIT(m), e)) { - log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing."); - return -EINVAL; - } - - if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) { - log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where); - return -EINVAL; - } - - p = get_mount_parameters_fragment(m); - if (p && !p->what) { - log_unit_error(UNIT(m), "What= setting is missing. Refusing."); - return -EBADMSG; - } - - if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) { - log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing."); - return -EINVAL; - } - - return 0; -} - -static int mount_add_extras(Mount *m) { - Unit *u = UNIT(m); - int r; - - assert(m); - - if (u->fragment_path) - m->from_fragment = true; - - if (!m->where) { - r = unit_name_to_path(u->id, &m->where); - if (r < 0) - return r; - } - - path_kill_slashes(m->where); - - if (!u->description) { - r = unit_set_description(u, m->where); - if (r < 0) - return r; - } - - r = mount_add_device_links(m); - if (r < 0) - return r; - - r = mount_add_mount_links(m); - if (r < 0) - return r; - - r = mount_add_quota_links(m); - if (r < 0) - return r; - - r = unit_patch_contexts(u); - if (r < 0) - return r; - - r = unit_add_exec_dependencies(u, &m->exec_context); - if (r < 0) - return r; - - r = unit_set_default_slice(u); - if (r < 0) - return r; - - r = mount_add_default_dependencies(m); - if (r < 0) - return r; - - return 0; -} - -static int mount_load_root_mount(Unit *u) { - assert(u); - - if (!unit_has_name(u, SPECIAL_ROOT_MOUNT)) - return 0; - - u->perpetual = true; - u->default_dependencies = false; - - /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */ - MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL; - MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL; - - if (!u->description) - u->description = strdup("Root Mount"); - - return 1; -} - -static int mount_load(Unit *u) { - Mount *m = MOUNT(u); - int r; - - assert(u); - assert(u->load_state == UNIT_STUB); - - r = mount_load_root_mount(u); - if (r < 0) - return r; - - if (m->from_proc_self_mountinfo || u->perpetual) - r = unit_load_fragment_and_dropin_optional(u); - else - r = unit_load_fragment_and_dropin(u); - if (r < 0) - return r; - - /* This is a new unit? Then let's add in some extras */ - if (u->load_state == UNIT_LOADED) { - r = mount_add_extras(m); - if (r < 0) - return r; - } - - return mount_verify(m); -} - -static void mount_set_state(Mount *m, MountState state) { - MountState old_state; - assert(m); - - old_state = m->state; - m->state = state; - - if (!mount_state_active(state)) { - m->timer_event_source = sd_event_source_unref(m->timer_event_source); - mount_unwatch_control_pid(m); - m->control_command = NULL; - m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; - } - - if (state != old_state) - log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state)); - - unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], m->reload_result == MOUNT_SUCCESS); - m->reload_result = MOUNT_SUCCESS; -} - -static int mount_coldplug(Unit *u) { - Mount *m = MOUNT(u); - MountState new_state = MOUNT_DEAD; - int r; - - assert(m); - assert(m->state == MOUNT_DEAD); - - if (m->deserialized_state != m->state) - new_state = m->deserialized_state; - else if (m->from_proc_self_mountinfo) - new_state = MOUNT_MOUNTED; - - if (new_state == m->state) - return 0; - - if (m->control_pid > 0 && - pid_is_unwaited(m->control_pid) && - mount_state_active(new_state)) { - - r = unit_watch_pid(UNIT(m), m->control_pid); - if (r < 0) - return r; - - r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec)); - if (r < 0) - return r; - } - - if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) - (void) unit_setup_dynamic_creds(u); - - mount_set_state(m, new_state); - return 0; -} - -static void mount_dump(Unit *u, FILE *f, const char *prefix) { - Mount *m = MOUNT(u); - MountParameters *p; - - assert(m); - assert(f); - - p = get_mount_parameters(m); - - fprintf(f, - "%sMount State: %s\n" - "%sResult: %s\n" - "%sWhere: %s\n" - "%sWhat: %s\n" - "%sFile System Type: %s\n" - "%sOptions: %s\n" - "%sFrom /proc/self/mountinfo: %s\n" - "%sFrom fragment: %s\n" - "%sDirectoryMode: %04o\n" - "%sSloppyOptions: %s\n" - "%sLazyUnmount: %s\n" - "%sForceUnmount: %s\n", - prefix, mount_state_to_string(m->state), - prefix, mount_result_to_string(m->result), - prefix, m->where, - prefix, p ? strna(p->what) : "n/a", - prefix, p ? strna(p->fstype) : "n/a", - prefix, p ? strna(p->options) : "n/a", - prefix, yes_no(m->from_proc_self_mountinfo), - prefix, yes_no(m->from_fragment), - prefix, m->directory_mode, - prefix, yes_no(m->sloppy_options), - prefix, yes_no(m->lazy_unmount), - prefix, yes_no(m->force_unmount)); - - if (m->control_pid > 0) - fprintf(f, - "%sControl PID: "PID_FMT"\n", - prefix, m->control_pid); - - exec_context_dump(&m->exec_context, f, prefix); - kill_context_dump(&m->kill_context, f, prefix); -} - -static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) { - pid_t pid; - int r; - ExecParameters exec_params = { - .flags = EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN, - .stdin_fd = -1, - .stdout_fd = -1, - .stderr_fd = -1, - }; - - assert(m); - assert(c); - assert(_pid); - - (void) unit_realize_cgroup(UNIT(m)); - if (m->reset_cpu_usage) { - (void) unit_reset_cpu_usage(UNIT(m)); - m->reset_cpu_usage = false; - } - - r = unit_setup_exec_runtime(UNIT(m)); - if (r < 0) - return r; - - r = unit_setup_dynamic_creds(UNIT(m)); - if (r < 0) - return r; - - r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec)); - if (r < 0) - return r; - - exec_params.environment = UNIT(m)->manager->environment; - exec_params.flags |= UNIT(m)->manager->confirm_spawn ? EXEC_CONFIRM_SPAWN : 0; - exec_params.cgroup_supported = UNIT(m)->manager->cgroup_supported; - exec_params.cgroup_path = UNIT(m)->cgroup_path; - exec_params.cgroup_delegate = m->cgroup_context.delegate; - exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(m)->manager); - - r = exec_spawn(UNIT(m), - c, - &m->exec_context, - &exec_params, - m->exec_runtime, - &m->dynamic_creds, - &pid); - if (r < 0) - return r; - - r = unit_watch_pid(UNIT(m), pid); - if (r < 0) - /* FIXME: we need to do something here */ - return r; - - *_pid = pid; - - return 0; -} - -static void mount_enter_dead(Mount *m, MountResult f) { - assert(m); - - if (m->result == MOUNT_SUCCESS) - m->result = f; - - mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD); - - exec_runtime_destroy(m->exec_runtime); - m->exec_runtime = exec_runtime_unref(m->exec_runtime); - - exec_context_destroy_runtime_directory(&m->exec_context, manager_get_runtime_prefix(UNIT(m)->manager)); - - unit_unref_uid_gid(UNIT(m), true); - - dynamic_creds_destroy(&m->dynamic_creds); -} - -static void mount_enter_mounted(Mount *m, MountResult f) { - assert(m); - - if (m->result == MOUNT_SUCCESS) - m->result = f; - - mount_set_state(m, MOUNT_MOUNTED); -} - -static void mount_enter_signal(Mount *m, MountState state, MountResult f) { - int r; - - assert(m); - - if (m->result == MOUNT_SUCCESS) - m->result = f; - - r = unit_kill_context( - UNIT(m), - &m->kill_context, - (state != MOUNT_MOUNTING_SIGTERM && state != MOUNT_UNMOUNTING_SIGTERM && state != MOUNT_REMOUNTING_SIGTERM) ? - KILL_KILL : KILL_TERMINATE, - -1, - m->control_pid, - false); - if (r < 0) - goto fail; - - if (r > 0) { - r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec)); - if (r < 0) - goto fail; - - mount_set_state(m, state); - } else if (state == MOUNT_REMOUNTING_SIGTERM) - mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS); - else if (state == MOUNT_REMOUNTING_SIGKILL) - mount_enter_mounted(m, MOUNT_SUCCESS); - else if (state == MOUNT_MOUNTING_SIGTERM) - mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_SUCCESS); - else if (state == MOUNT_UNMOUNTING_SIGTERM) - mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS); - else - mount_enter_dead(m, MOUNT_SUCCESS); - - return; - -fail: - log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m"); - - if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL)) - mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES); - else - mount_enter_dead(m, MOUNT_FAILURE_RESOURCES); -} - -static void mount_enter_unmounting(Mount *m) { - int r; - - assert(m); - - /* Start counting our attempts */ - if (!IN_SET(m->state, - MOUNT_UNMOUNTING, - MOUNT_UNMOUNTING_SIGTERM, - MOUNT_UNMOUNTING_SIGKILL)) - m->n_retry_umount = 0; - - m->control_command_id = MOUNT_EXEC_UNMOUNT; - m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT; - - r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, NULL); - if (r >= 0 && m->lazy_unmount) - r = exec_command_append(m->control_command, "-l", NULL); - if (r >= 0 && m->force_unmount) - r = exec_command_append(m->control_command, "-f", NULL); - if (r < 0) - goto fail; - - mount_unwatch_control_pid(m); - - r = mount_spawn(m, m->control_command, &m->control_pid); - if (r < 0) - goto fail; - - mount_set_state(m, MOUNT_UNMOUNTING); - - return; - -fail: - log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m"); - mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES); -} - -static void mount_enter_mounting(Mount *m) { - int r; - MountParameters *p; - - assert(m); - - m->control_command_id = MOUNT_EXEC_MOUNT; - m->control_command = m->exec_command + MOUNT_EXEC_MOUNT; - - r = unit_fail_if_symlink(UNIT(m), m->where); - if (r < 0) - goto fail; - - (void) mkdir_p_label(m->where, m->directory_mode); - - unit_warn_if_dir_nonempty(UNIT(m), m->where); - - /* Create the source directory for bind-mounts if needed */ - p = get_mount_parameters_fragment(m); - if (p && mount_is_bind(p)) - (void) mkdir_p_label(p->what, m->directory_mode); - - if (p) { - _cleanup_free_ char *opts = NULL; - - r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts); - if (r < 0) - goto fail; - - r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL); - if (r >= 0 && m->sloppy_options) - r = exec_command_append(m->control_command, "-s", NULL); - if (r >= 0 && p->fstype) - r = exec_command_append(m->control_command, "-t", p->fstype, NULL); - if (r >= 0 && !isempty(opts)) - r = exec_command_append(m->control_command, "-o", opts, NULL); - } else - r = -ENOENT; - - if (r < 0) - goto fail; - - mount_unwatch_control_pid(m); - - r = mount_spawn(m, m->control_command, &m->control_pid); - if (r < 0) - goto fail; - - mount_set_state(m, MOUNT_MOUNTING); - - return; - -fail: - log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m"); - mount_enter_dead(m, MOUNT_FAILURE_RESOURCES); -} - -static void mount_enter_remounting(Mount *m) { - int r; - MountParameters *p; - - assert(m); - - m->control_command_id = MOUNT_EXEC_REMOUNT; - m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT; - - p = get_mount_parameters_fragment(m); - if (p) { - const char *o; - - if (p->options) - o = strjoina("remount,", p->options); - else - o = "remount"; - - r = exec_command_set(m->control_command, MOUNT_PATH, - p->what, m->where, - "-o", o, NULL); - if (r >= 0 && m->sloppy_options) - r = exec_command_append(m->control_command, "-s", NULL); - if (r >= 0 && p->fstype) - r = exec_command_append(m->control_command, "-t", p->fstype, NULL); - } else - r = -ENOENT; - - if (r < 0) - goto fail; - - mount_unwatch_control_pid(m); - - r = mount_spawn(m, m->control_command, &m->control_pid); - if (r < 0) - goto fail; - - mount_set_state(m, MOUNT_REMOUNTING); - - return; - -fail: - log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m"); - m->reload_result = MOUNT_FAILURE_RESOURCES; - mount_enter_mounted(m, MOUNT_SUCCESS); -} - -static int mount_start(Unit *u) { - Mount *m = MOUNT(u); - int r; - - assert(m); - - /* We cannot fulfill this request right now, try again later - * please! */ - if (IN_SET(m->state, - MOUNT_UNMOUNTING, - MOUNT_UNMOUNTING_SIGTERM, - MOUNT_UNMOUNTING_SIGKILL, - MOUNT_MOUNTING_SIGTERM, - MOUNT_MOUNTING_SIGKILL)) - return -EAGAIN; - - /* Already on it! */ - if (m->state == MOUNT_MOUNTING) - return 0; - - assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED)); - - r = unit_start_limit_test(u); - if (r < 0) { - mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT); - return r; - } - - r = unit_acquire_invocation_id(u); - if (r < 0) - return r; - - m->result = MOUNT_SUCCESS; - m->reload_result = MOUNT_SUCCESS; - m->reset_cpu_usage = true; - - mount_enter_mounting(m); - return 1; -} - -static int mount_stop(Unit *u) { - Mount *m = MOUNT(u); - - assert(m); - - /* Already on it */ - if (IN_SET(m->state, - MOUNT_UNMOUNTING, - MOUNT_UNMOUNTING_SIGKILL, - MOUNT_UNMOUNTING_SIGTERM, - MOUNT_MOUNTING_SIGTERM, - MOUNT_MOUNTING_SIGKILL)) - return 0; - - assert(IN_SET(m->state, - MOUNT_MOUNTING, - MOUNT_MOUNTING_DONE, - MOUNT_MOUNTED, - MOUNT_REMOUNTING, - MOUNT_REMOUNTING_SIGTERM, - MOUNT_REMOUNTING_SIGKILL)); - - mount_enter_unmounting(m); - return 1; -} - -static int mount_reload(Unit *u) { - Mount *m = MOUNT(u); - - assert(m); - - if (m->state == MOUNT_MOUNTING_DONE) - return -EAGAIN; - - assert(m->state == MOUNT_MOUNTED); - - mount_enter_remounting(m); - return 1; -} - -static int mount_serialize(Unit *u, FILE *f, FDSet *fds) { - Mount *m = MOUNT(u); - - assert(m); - assert(f); - assert(fds); - - unit_serialize_item(u, f, "state", mount_state_to_string(m->state)); - unit_serialize_item(u, f, "result", mount_result_to_string(m->result)); - unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result)); - - if (m->control_pid > 0) - unit_serialize_item_format(u, f, "control-pid", PID_FMT, m->control_pid); - - if (m->control_command_id >= 0) - unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id)); - - return 0; -} - -static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { - Mount *m = MOUNT(u); - - assert(u); - assert(key); - assert(value); - assert(fds); - - if (streq(key, "state")) { - MountState state; - - if ((state = mount_state_from_string(value)) < 0) - log_unit_debug(u, "Failed to parse state value: %s", value); - else - m->deserialized_state = state; - } else if (streq(key, "result")) { - MountResult f; - - f = mount_result_from_string(value); - if (f < 0) - log_unit_debug(u, "Failed to parse result value: %s", value); - else if (f != MOUNT_SUCCESS) - m->result = f; - - } else if (streq(key, "reload-result")) { - MountResult f; - - f = mount_result_from_string(value); - if (f < 0) - log_unit_debug(u, "Failed to parse reload result value: %s", value); - else if (f != MOUNT_SUCCESS) - m->reload_result = f; - - } else if (streq(key, "control-pid")) { - pid_t pid; - - if (parse_pid(value, &pid) < 0) - log_unit_debug(u, "Failed to parse control-pid value: %s", value); - else - m->control_pid = pid; - } else if (streq(key, "control-command")) { - MountExecCommand id; - - id = mount_exec_command_from_string(value); - if (id < 0) - log_unit_debug(u, "Failed to parse exec-command value: %s", value); - else { - m->control_command_id = id; - m->control_command = m->exec_command + id; - } - } else - log_unit_debug(u, "Unknown serialization key: %s", key); - - return 0; -} - -_pure_ static UnitActiveState mount_active_state(Unit *u) { - assert(u); - - return state_translation_table[MOUNT(u)->state]; -} - -_pure_ static const char *mount_sub_state_to_string(Unit *u) { - assert(u); - - return mount_state_to_string(MOUNT(u)->state); -} - -_pure_ static bool mount_check_gc(Unit *u) { - Mount *m = MOUNT(u); - - assert(m); - - return m->from_proc_self_mountinfo; -} - -static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) { - Mount *m = MOUNT(u); - MountResult f; - - assert(m); - assert(pid >= 0); - - if (pid != m->control_pid) - return; - - m->control_pid = 0; - - if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL)) - f = MOUNT_SUCCESS; - else if (code == CLD_EXITED) - f = MOUNT_FAILURE_EXIT_CODE; - else if (code == CLD_KILLED) - f = MOUNT_FAILURE_SIGNAL; - else if (code == CLD_DUMPED) - f = MOUNT_FAILURE_CORE_DUMP; - else - assert_not_reached("Unknown code"); - - if (m->result == MOUNT_SUCCESS) - m->result = f; - - if (m->control_command) { - exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status); - - m->control_command = NULL; - m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; - } - - log_unit_full(u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, - "Mount process exited, code=%s status=%i", sigchld_code_to_string(code), status); - - /* Note that mount(8) returning and the kernel sending us a - * mount table change event might happen out-of-order. If an - * operation succeed we assume the kernel will follow soon too - * and already change into the resulting state. If it fails - * we check if the kernel still knows about the mount. and - * change state accordingly. */ - - switch (m->state) { - - case MOUNT_MOUNTING: - case MOUNT_MOUNTING_DONE: - case MOUNT_MOUNTING_SIGKILL: - case MOUNT_MOUNTING_SIGTERM: - - if (f == MOUNT_SUCCESS || m->from_proc_self_mountinfo) - /* If /bin/mount returned success, or if we see the mount point in /proc/self/mountinfo we are - * happy. If we see the first condition first, we should see the the second condition - * immediately after – or /bin/mount lies to us and is broken. */ - mount_enter_mounted(m, f); - else - mount_enter_dead(m, f); - break; - - case MOUNT_REMOUNTING: - case MOUNT_REMOUNTING_SIGKILL: - case MOUNT_REMOUNTING_SIGTERM: - - m->reload_result = f; - if (m->from_proc_self_mountinfo) - mount_enter_mounted(m, MOUNT_SUCCESS); - else - mount_enter_dead(m, MOUNT_SUCCESS); - - break; - - case MOUNT_UNMOUNTING: - case MOUNT_UNMOUNTING_SIGKILL: - case MOUNT_UNMOUNTING_SIGTERM: - - if (f == MOUNT_SUCCESS) { - - if (m->from_proc_self_mountinfo) { - - /* Still a mount point? If so, let's - * try again. Most likely there were - * multiple mount points stacked on - * top of each other. Note that due to - * the io event priority logic we can - * be sure the new mountinfo is loaded - * before we process the SIGCHLD for - * the mount command. */ - - if (m->n_retry_umount < RETRY_UMOUNT_MAX) { - log_unit_debug(u, "Mount still present, trying again."); - m->n_retry_umount++; - mount_enter_unmounting(m); - } else { - log_unit_debug(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount); - mount_enter_mounted(m, f); - } - } else - mount_enter_dead(m, f); - - } else if (m->from_proc_self_mountinfo) - mount_enter_mounted(m, f); - else - mount_enter_dead(m, f); - break; - - default: - assert_not_reached("Uh, control process died at wrong time."); - } - - /* Notify clients about changed exit status */ - unit_add_to_dbus_queue(u); -} - -static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { - Mount *m = MOUNT(userdata); - - assert(m); - assert(m->timer_event_source == source); - - switch (m->state) { - - case MOUNT_MOUNTING: - case MOUNT_MOUNTING_DONE: - log_unit_warning(UNIT(m), "Mounting timed out. Stopping."); - mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT); - break; - - case MOUNT_REMOUNTING: - log_unit_warning(UNIT(m), "Remounting timed out. Stopping."); - m->reload_result = MOUNT_FAILURE_TIMEOUT; - mount_enter_mounted(m, MOUNT_SUCCESS); - break; - - case MOUNT_UNMOUNTING: - log_unit_warning(UNIT(m), "Unmounting timed out. Stopping."); - mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT); - break; - - case MOUNT_MOUNTING_SIGTERM: - if (m->kill_context.send_sigkill) { - log_unit_warning(UNIT(m), "Mounting timed out. Killing."); - mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT); - } else { - log_unit_warning(UNIT(m), "Mounting timed out. Skipping SIGKILL. Ignoring."); - - if (m->from_proc_self_mountinfo) - mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT); - else - mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT); - } - break; - - case MOUNT_REMOUNTING_SIGTERM: - if (m->kill_context.send_sigkill) { - log_unit_warning(UNIT(m), "Remounting timed out. Killing."); - mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT); - } else { - log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring."); - - if (m->from_proc_self_mountinfo) - mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT); - else - mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT); - } - break; - - case MOUNT_UNMOUNTING_SIGTERM: - if (m->kill_context.send_sigkill) { - log_unit_warning(UNIT(m), "Unmounting timed out. Killing."); - mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT); - } else { - log_unit_warning(UNIT(m), "Unmounting timed out. Skipping SIGKILL. Ignoring."); - - if (m->from_proc_self_mountinfo) - mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT); - else - mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT); - } - break; - - case MOUNT_MOUNTING_SIGKILL: - case MOUNT_REMOUNTING_SIGKILL: - case MOUNT_UNMOUNTING_SIGKILL: - log_unit_warning(UNIT(m),"Mount process still around after SIGKILL. Ignoring."); - - if (m->from_proc_self_mountinfo) - mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT); - else - mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT); - break; - - default: - assert_not_reached("Timeout at wrong time."); - } - - return 0; -} - -static int mount_setup_unit( - Manager *m, - const char *what, - const char *where, - const char *options, - const char *fstype, - bool set_flags) { - - _cleanup_free_ char *e = NULL, *w = NULL, *o = NULL, *f = NULL; - bool load_extras = false; - MountParameters *p; - bool delete, changed = false; - Unit *u; - int r; - - assert(m); - assert(what); - assert(where); - assert(options); - assert(fstype); - - /* Ignore API mount points. They should never be referenced in - * dependencies ever. */ - if (mount_point_is_api(where) || mount_point_ignore(where)) - return 0; - - if (streq(fstype, "autofs")) - return 0; - - /* probably some kind of swap, ignore */ - if (!is_path(where)) - return 0; - - r = unit_name_from_path(where, ".mount", &e); - if (r < 0) - return r; - - u = manager_get_unit(m, e); - if (!u) { - delete = true; - - r = unit_new_for_name(m, sizeof(Mount), e, &u); - if (r < 0) - goto fail; - - MOUNT(u)->where = strdup(where); - if (!MOUNT(u)->where) { - r = -ENOMEM; - goto fail; - } - - u->source_path = strdup("/proc/self/mountinfo"); - if (!u->source_path) { - r = -ENOMEM; - goto fail; - } - - if (MANAGER_IS_SYSTEM(m)) { - const char* target; - - target = mount_needs_network(options, fstype) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET; - r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, NULL, true); - if (r < 0) - goto fail; - - if (should_umount(MOUNT(u))) { - r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); - if (r < 0) - goto fail; - } - } - - unit_add_to_load_queue(u); - changed = true; - } else { - delete = false; - - if (!MOUNT(u)->where) { - MOUNT(u)->where = strdup(where); - if (!MOUNT(u)->where) { - r = -ENOMEM; - goto fail; - } - } - - if (MANAGER_IS_SYSTEM(m) && - mount_needs_network(options, fstype)) { - /* _netdev option may have shown up late, or on a - * remount. Add remote-fs dependencies, even though - * local-fs ones may already be there. */ - unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, NULL, true); - load_extras = true; - } - - if (u->load_state == UNIT_NOT_FOUND) { - u->load_state = UNIT_LOADED; - u->load_error = 0; - - /* Load in the extras later on, after we - * finished initialization of the unit */ - load_extras = true; - changed = true; - } - } - - w = strdup(what); - o = strdup(options); - f = strdup(fstype); - if (!w || !o || !f) { - r = -ENOMEM; - goto fail; - } - - p = &MOUNT(u)->parameters_proc_self_mountinfo; - - changed = changed || - !streq_ptr(p->options, options) || - !streq_ptr(p->what, what) || - !streq_ptr(p->fstype, fstype); - - if (set_flags) { - MOUNT(u)->is_mounted = true; - MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo; - MOUNT(u)->just_changed = changed; - } - - MOUNT(u)->from_proc_self_mountinfo = true; - - free_and_replace(p->what, w); - free_and_replace(p->options, o); - free_and_replace(p->fstype, f); - - if (load_extras) { - r = mount_add_extras(MOUNT(u)); - if (r < 0) - goto fail; - } - - if (changed) - unit_add_to_dbus_queue(u); - - return 0; - -fail: - log_warning_errno(r, "Failed to set up mount unit: %m"); - - if (delete && u) - unit_free(u); - - return r; -} - -static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) { - _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL; - _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL; - int r = 0; - - assert(m); - - t = mnt_new_table(); - if (!t) - return log_oom(); - - i = mnt_new_iter(MNT_ITER_FORWARD); - if (!i) - return log_oom(); - - r = mnt_table_parse_mtab(t, NULL); - if (r < 0) - return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m"); - - r = 0; - for (;;) { - const char *device, *path, *options, *fstype; - _cleanup_free_ char *d = NULL, *p = NULL; - struct libmnt_fs *fs; - int k; - - k = mnt_table_next_fs(t, i, &fs); - if (k == 1) - break; - if (k < 0) - return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m"); - - device = mnt_fs_get_source(fs); - path = mnt_fs_get_target(fs); - options = mnt_fs_get_options(fs); - fstype = mnt_fs_get_fstype(fs); - - if (!device || !path) - continue; - - if (cunescape(device, UNESCAPE_RELAX, &d) < 0) - return log_oom(); - - if (cunescape(path, UNESCAPE_RELAX, &p) < 0) - return log_oom(); - - (void) device_found_node(m, d, true, DEVICE_FOUND_MOUNT, set_flags); - - k = mount_setup_unit(m, d, p, options, fstype, set_flags); - if (r == 0 && k < 0) - r = k; - } - - return r; -} - -static void mount_shutdown(Manager *m) { - - assert(m); - - m->mount_event_source = sd_event_source_unref(m->mount_event_source); - - mnt_unref_monitor(m->mount_monitor); - m->mount_monitor = NULL; -} - -static int mount_get_timeout(Unit *u, usec_t *timeout) { - Mount *m = MOUNT(u); - usec_t t; - int r; - - if (!m->timer_event_source) - return 0; - - r = sd_event_source_get_time(m->timer_event_source, &t); - if (r < 0) - return r; - if (t == USEC_INFINITY) - return 0; - - *timeout = t; - return 1; -} - -static int synthesize_root_mount(Manager *m) { - Unit *u; - int r; - - assert(m); - - /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's - * unconditionally synthesize it here and mark it as perpetual. */ - - u = manager_get_unit(m, SPECIAL_ROOT_MOUNT); - if (!u) { - r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u); - if (r < 0) - return log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m"); - } - - u->perpetual = true; - MOUNT(u)->deserialized_state = MOUNT_MOUNTED; - - unit_add_to_load_queue(u); - unit_add_to_dbus_queue(u); - - return 0; -} - -static bool mount_is_mounted(Mount *m) { - assert(m); - - return UNIT(m)->perpetual || m->is_mounted; -} - -static void mount_enumerate(Manager *m) { - int r; - - assert(m); - - r = synthesize_root_mount(m); - if (r < 0) - goto fail; - - mnt_init_debug(0); - - if (!m->mount_monitor) { - int fd; - - m->mount_monitor = mnt_new_monitor(); - if (!m->mount_monitor) { - log_oom(); - goto fail; - } - - r = mnt_monitor_enable_kernel(m->mount_monitor, 1); - if (r < 0) { - log_error_errno(r, "Failed to enable watching of kernel mount events: %m"); - goto fail; - } - - r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL); - if (r < 0) { - log_error_errno(r, "Failed to enable watching of userspace mount events: %m"); - goto fail; - } - - /* mnt_unref_monitor() will close the fd */ - fd = r = mnt_monitor_get_fd(m->mount_monitor); - if (r < 0) { - log_error_errno(r, "Failed to acquire watch file descriptor: %m"); - goto fail; - } - - r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m); - if (r < 0) { - log_error_errno(r, "Failed to watch mount file descriptor: %m"); - goto fail; - } - - r = sd_event_source_set_priority(m->mount_event_source, -10); - if (r < 0) { - log_error_errno(r, "Failed to adjust mount watch priority: %m"); - goto fail; - } - - (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch"); - } - - r = mount_load_proc_self_mountinfo(m, false); - if (r < 0) - goto fail; - - return; - -fail: - mount_shutdown(m); -} - -static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { - _cleanup_set_free_ Set *around = NULL, *gone = NULL; - Manager *m = userdata; - const char *what; - Iterator i; - Unit *u; - int r; - - assert(m); - assert(revents & EPOLLIN); - - if (fd == mnt_monitor_get_fd(m->mount_monitor)) { - bool rescan = false; - - /* Drain all events and verify that the event is valid. - * - * Note that libmount also monitors /run/mount mkdir if the - * directory does not exist yet. The mkdir may generate event - * which is irrelevant for us. - * - * error: r < 0; valid: r == 0, false positive: rc == 1 */ - do { - r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL); - if (r == 0) - rescan = true; - else if (r < 0) - return log_error_errno(r, "Failed to drain libmount events"); - } while (r == 0); - - log_debug("libmount event [rescan: %s]", yes_no(rescan)); - if (!rescan) - return 0; - } - - r = mount_load_proc_self_mountinfo(m, true); - if (r < 0) { - /* Reset flags, just in case, for later calls */ - LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) { - Mount *mount = MOUNT(u); - - mount->is_mounted = mount->just_mounted = mount->just_changed = false; - } - - return 0; - } - - manager_dispatch_load_queue(m); - - LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) { - Mount *mount = MOUNT(u); - - if (!mount_is_mounted(mount)) { - - /* A mount point is not around right now. It - * might be gone, or might never have - * existed. */ - - if (mount->from_proc_self_mountinfo && - mount->parameters_proc_self_mountinfo.what) { - - /* Remember that this device might just have disappeared */ - if (set_ensure_allocated(&gone, &string_hash_ops) < 0 || - set_put(gone, mount->parameters_proc_self_mountinfo.what) < 0) - log_oom(); /* we don't care too much about OOM here... */ - } - - mount->from_proc_self_mountinfo = false; - - switch (mount->state) { - - case MOUNT_MOUNTED: - /* This has just been unmounted by - * somebody else, follow the state - * change. */ - mount->result = MOUNT_SUCCESS; /* make sure we forget any earlier umount failures */ - mount_enter_dead(mount, MOUNT_SUCCESS); - break; - - default: - break; - } - - } else if (mount->just_mounted || mount->just_changed) { - - /* A mount point was added or changed */ - - switch (mount->state) { - - case MOUNT_DEAD: - case MOUNT_FAILED: - - /* This has just been mounted by somebody else, follow the state change, but let's - * generate a new invocation ID for this implicitly and automatically. */ - (void) unit_acquire_invocation_id(UNIT(mount)); - mount_enter_mounted(mount, MOUNT_SUCCESS); - break; - - case MOUNT_MOUNTING: - mount_set_state(mount, MOUNT_MOUNTING_DONE); - break; - - default: - /* Nothing really changed, but let's - * issue an notification call - * nonetheless, in case somebody is - * waiting for this. (e.g. file system - * ro/rw remounts.) */ - mount_set_state(mount, mount->state); - break; - } - } - - if (mount_is_mounted(mount) && - mount->from_proc_self_mountinfo && - mount->parameters_proc_self_mountinfo.what) { - - if (set_ensure_allocated(&around, &string_hash_ops) < 0 || - set_put(around, mount->parameters_proc_self_mountinfo.what) < 0) - log_oom(); - } - - /* Reset the flags for later calls */ - mount->is_mounted = mount->just_mounted = mount->just_changed = false; - } - - SET_FOREACH(what, gone, i) { - if (set_contains(around, what)) - continue; - - /* Let the device units know that the device is no longer mounted */ - (void) device_found_node(m, what, false, DEVICE_FOUND_MOUNT, true); - } - - return 0; -} - -static void mount_reset_failed(Unit *u) { - Mount *m = MOUNT(u); - - assert(m); - - if (m->state == MOUNT_FAILED) - mount_set_state(m, MOUNT_DEAD); - - m->result = MOUNT_SUCCESS; - m->reload_result = MOUNT_SUCCESS; -} - -static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { - return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error); -} - -static int mount_control_pid(Unit *u) { - Mount *m = MOUNT(u); - - assert(m); - - return m->control_pid; -} - -static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = { - [MOUNT_EXEC_MOUNT] = "ExecMount", - [MOUNT_EXEC_UNMOUNT] = "ExecUnmount", - [MOUNT_EXEC_REMOUNT] = "ExecRemount", -}; - -DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand); - -static const char* const mount_result_table[_MOUNT_RESULT_MAX] = { - [MOUNT_SUCCESS] = "success", - [MOUNT_FAILURE_RESOURCES] = "resources", - [MOUNT_FAILURE_TIMEOUT] = "timeout", - [MOUNT_FAILURE_EXIT_CODE] = "exit-code", - [MOUNT_FAILURE_SIGNAL] = "signal", - [MOUNT_FAILURE_CORE_DUMP] = "core-dump", - [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit", -}; - -DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult); - -const UnitVTable mount_vtable = { - .object_size = sizeof(Mount), - .exec_context_offset = offsetof(Mount, exec_context), - .cgroup_context_offset = offsetof(Mount, cgroup_context), - .kill_context_offset = offsetof(Mount, kill_context), - .exec_runtime_offset = offsetof(Mount, exec_runtime), - .dynamic_creds_offset = offsetof(Mount, dynamic_creds), - - .sections = - "Unit\0" - "Mount\0" - "Install\0", - .private_section = "Mount", - - .init = mount_init, - .load = mount_load, - .done = mount_done, - - .coldplug = mount_coldplug, - - .dump = mount_dump, - - .start = mount_start, - .stop = mount_stop, - .reload = mount_reload, - - .kill = mount_kill, - - .serialize = mount_serialize, - .deserialize_item = mount_deserialize_item, - - .active_state = mount_active_state, - .sub_state_to_string = mount_sub_state_to_string, - - .check_gc = mount_check_gc, - - .sigchld_event = mount_sigchld_event, - - .reset_failed = mount_reset_failed, - - .control_pid = mount_control_pid, - - .bus_vtable = bus_mount_vtable, - .bus_set_property = bus_mount_set_property, - .bus_commit_properties = bus_mount_commit_properties, - - .get_timeout = mount_get_timeout, - - .can_transient = true, - - .enumerate = mount_enumerate, - .shutdown = mount_shutdown, - - .status_message_formats = { - .starting_stopping = { - [0] = "Mounting %s...", - [1] = "Unmounting %s...", - }, - .finished_start_job = { - [JOB_DONE] = "Mounted %s.", - [JOB_FAILED] = "Failed to mount %s.", - [JOB_TIMEOUT] = "Timed out mounting %s.", - }, - .finished_stop_job = { - [JOB_DONE] = "Unmounted %s.", - [JOB_FAILED] = "Failed unmounting %s.", - [JOB_TIMEOUT] = "Timed out unmounting %s.", - }, - }, -}; |