| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| |
| #include <errno.h> |
| #include <signal.h> |
| #include <stdio.h> |
| #include <sys/epoll.h> |
| |
| #include <libmount.h> |
| |
| #include "sd-messages.h" |
| |
| #include "alloc-util.h" |
| #include "dbus-mount.h" |
| #include "device.h" |
| #include "escape.h" |
| #include "exit-status.h" |
| #include "format-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_ACTIVATING, |
| [MOUNT_MOUNTED] = UNIT_ACTIVE, |
| [MOUNT_REMOUNTING] = UNIT_RELOADING, |
| [MOUNT_UNMOUNTING] = 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 int mount_process_proc_self_mountinfo(Manager *m); |
| |
| static bool MOUNT_STATE_WITH_PROCESS(MountState state) { |
| return IN_SET(state, |
| MOUNT_MOUNTING, |
| MOUNT_MOUNTING_DONE, |
| MOUNT_REMOUNTING, |
| MOUNT_REMOUNTING_SIGTERM, |
| MOUNT_REMOUNTING_SIGKILL, |
| MOUNT_UNMOUNTING, |
| MOUNT_UNMOUNTING_SIGTERM, |
| MOUNT_UNMOUNTING_SIGKILL); |
| } |
| |
| 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_is_bound_to_device(const Mount *m) { |
| const MountParameters *p; |
| |
| if (m->from_fragment) |
| return true; |
| |
| p = &m->parameters_proc_self_mountinfo; |
| return fstab_test_option(p->options, "x-systemd.device-bound\0"); |
| } |
| |
| 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->exec_context.std_output = u->manager->default_std_output; |
| m->exec_context.std_error = u->manager->default_std_error; |
| |
| 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, false); |
| 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_dependencies(Mount *m) { |
| MountParameters *pm; |
| Unit *other; |
| Iterator i; |
| Set *s; |
| int r; |
| |
| assert(m); |
| |
| if (!path_equal(m->where, "/")) { |
| _cleanup_free_ char *parent = NULL; |
| |
| /* 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, UNIT_DEPENDENCY_IMPLICIT); |
| if (r < 0) |
| return r; |
| } |
| |
| /* Adds in dependencies 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, UNIT_DEPENDENCY_FILE); |
| if (r < 0) |
| return r; |
| } |
| |
| /* Adds in dependencies 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, UNIT_DEPENDENCY_PATH); |
| 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, UNIT_DEPENDENCY_PATH); |
| if (r < 0) |
| return r; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int mount_add_device_dependencies(Mount *m) { |
| bool device_wants_mount = false; |
| UnitDependencyMask mask; |
| MountParameters *p; |
| UnitDependency dep; |
| 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; |
| |
| /* Mount units from /proc/self/mountinfo are not bound to devices |
| * by default since they're subject to races when devices are |
| * unplugged. But the user can still force this dep with an |
| * appropriate option (or udev property) so the mount units are |
| * automatically stopped when the device disappears suddenly. */ |
| dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES; |
| |
| mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT; |
| |
| r = unit_add_node_dependency(UNIT(m), p->what, device_wants_mount, dep, mask); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static int mount_add_quota_dependencies(Mount *m) { |
| UnitDependencyMask mask; |
| MountParameters *p; |
| int r; |
| |
| 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; |
| |
| mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT; |
| |
| r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true, mask); |
| if (r < 0) |
| return r; |
| |
| r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true, mask); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static bool mount_is_extrinsic(Mount *m) { |
| MountParameters *p; |
| assert(m); |
| |
| /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown |
| * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency |
| * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */ |
| |
| if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */ |
| return true; |
| |
| if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */ |
| "/", |
| "/usr")) |
| return true; |
| |
| if (PATH_STARTSWITH_SET(m->where, |
| "/run/initramfs", /* This should stay around from before we boot until after we shutdown */ |
| "/proc", /* All of this is API VFS */ |
| "/sys", /* … dito … */ |
| "/dev")) /* … dito … */ |
| return true; |
| |
| /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */ |
| p = get_mount_parameters(m); |
| if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd()) |
| return true; |
| |
| return false; |
| } |
| |
| static int mount_add_default_dependencies(Mount *m) { |
| UnitDependencyMask mask; |
| int r; |
| MountParameters *p; |
| const char *after; |
| |
| assert(m); |
| |
| if (!UNIT(m)->default_dependencies) |
| 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 (mount_is_extrinsic(m)) |
| return 0; |
| |
| p = get_mount_parameters(m); |
| if (!p) |
| return 0; |
| |
| mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT; |
| |
| 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, mask); |
| 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, mask); |
| 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, mask); |
| if (r < 0) |
| return r; |
| |
| r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true, mask); |
| if (r < 0) |
| return r; |
| |
| /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */ |
| if (streq_ptr(p->fstype, "tmpfs")) { |
| r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, NULL, true, mask); |
| 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 && !UNIT(m)->perpetual) |
| 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 -ENOEXEC; |
| } |
| |
| 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 -ENOEXEC; |
| } |
| |
| p = get_mount_parameters_fragment(m); |
| if (p && !p->what) { |
| log_unit_error(UNIT(m), "What= setting is missing. Refusing."); |
| return -ENOEXEC; |
| } |
| |
| 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 -ENOEXEC; |
| } |
| |
| 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_simplify(m->where, false); |
| |
| if (!u->description) { |
| r = unit_set_description(u, m->where); |
| if (r < 0) |
| return r; |
| } |
| |
| r = mount_add_device_dependencies(m); |
| if (r < 0) |
| return r; |
| |
| r = mount_add_mount_dependencies(m); |
| if (r < 0) |
| return r; |
| |
| r = mount_add_quota_dependencies(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_WITH_PROCESS(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 ? 0 : UNIT_NOTIFY_RELOAD_FAILURE); |
| } |
| |
| 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_WITH_PROCESS(new_state)) { |
| |
| r = unit_watch_pid(UNIT(m), m->control_pid, false); |
| 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); |
| (void) unit_setup_exec_runtime(u); |
| } |
| |
| mount_set_state(m, new_state); |
| return 0; |
| } |
| |
| static void mount_dump(Unit *u, FILE *f, const char *prefix) { |
| char buf[FORMAT_TIMESPAN_MAX]; |
| 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" |
| "%sExtrinsic: %s\n" |
| "%sDirectoryMode: %04o\n" |
| "%sSloppyOptions: %s\n" |
| "%sLazyUnmount: %s\n" |
| "%sForceUnmount: %s\n" |
| "%sTimoutSec: %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, yes_no(mount_is_extrinsic(m)), |
| prefix, m->directory_mode, |
| prefix, yes_no(m->sloppy_options), |
| prefix, yes_no(m->lazy_unmount), |
| prefix, yes_no(m->force_unmount), |
| prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC)); |
| |
| 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); |
| cgroup_context_dump(&m->cgroup_context, f, prefix); |
| } |
| |
| static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) { |
| |
| ExecParameters exec_params = { |
| .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN, |
| .stdin_fd = -1, |
| .stdout_fd = -1, |
| .stderr_fd = -1, |
| .exec_fd = -1, |
| }; |
| pid_t pid; |
| int r; |
| |
| assert(m); |
| assert(c); |
| assert(_pid); |
| |
| r = unit_prepare_exec(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; |
| |
| unit_set_exec_params(UNIT(m), &exec_params); |
| |
| 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, true); |
| if (r < 0) |
| 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; |
| |
| if (m->result != MOUNT_SUCCESS) |
| log_unit_warning(UNIT(m), "Failed with result '%s'.", mount_result_to_string(m->result)); |
| |
| mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD); |
| |
| m->exec_runtime = exec_runtime_unref(m->exec_runtime, true); |
| |
| exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]); |
| |
| 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_dead_or_mounted(Mount *m, MountResult f) { |
| assert(m); |
| |
| /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this |
| * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all |
| * ultimately we just mirror the kernel's internal state on this. */ |
| |
| if (m->from_proc_self_mountinfo) |
| mount_enter_mounted(m, f); |
| else |
| mount_enter_dead(m, f); |
| } |
| |
| static int state_to_kill_operation(MountState state) { |
| switch (state) { |
| |
| case MOUNT_REMOUNTING_SIGTERM: |
| case MOUNT_UNMOUNTING_SIGTERM: |
| return KILL_TERMINATE; |
| |
| case MOUNT_REMOUNTING_SIGKILL: |
| case MOUNT_UNMOUNTING_SIGKILL: |
| return KILL_KILL; |
| |
| default: |
| return _KILL_OPERATION_INVALID; |
| } |
| } |
| |
| 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_to_kill_operation(state), |
| -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 && m->kill_context.send_sigkill) |
| mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS); |
| else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL)) |
| mount_enter_mounted(m, MOUNT_SUCCESS); |
| else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill) |
| mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS); |
| else |
| mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); |
| |
| return; |
| |
| fail: |
| log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m"); |
| mount_enter_dead_or_mounted(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, "-c", 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_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES); |
| } |
| |
| static void mount_enter_mounting(Mount *m) { |
| int r; |
| MountParameters *p; |
| |
| assert(m); |
| |
| r = unit_fail_if_noncanonical(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); |
| |
| unit_warn_leftover_processes(UNIT(m)); |
| |
| m->control_command_id = MOUNT_EXEC_MOUNT; |
| m->control_command = m->exec_command + MOUNT_EXEC_MOUNT; |
| |
| /* 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_or_mounted(m, MOUNT_FAILURE_RESOURCES); |
| } |
| |
| static void mount_set_reload_result(Mount *m, MountResult result) { |
| assert(m); |
| |
| /* Only store the first error we encounter */ |
| if (m->reload_result != MOUNT_SUCCESS) |
| return; |
| |
| m->reload_result = result; |
| } |
| |
| static void mount_enter_remounting(Mount *m) { |
| int r; |
| MountParameters *p; |
| |
| assert(m); |
| |
| /* Reset reload result when we are about to start a new remount operation */ |
| m->reload_result = MOUNT_SUCCESS; |
| |
| 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"); |
| mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES); |
| mount_enter_dead_or_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)) |
| 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; |
| |
| u->reset_accounting = true; |
| |
| mount_enter_mounting(m); |
| return 1; |
| } |
| |
| static int mount_stop(Unit *u) { |
| Mount *m = MOUNT(u); |
| |
| assert(m); |
| |
| switch (m->state) { |
| |
| case MOUNT_UNMOUNTING: |
| case MOUNT_UNMOUNTING_SIGKILL: |
| case MOUNT_UNMOUNTING_SIGTERM: |
| /* Already on it */ |
| return 0; |
| |
| case MOUNT_MOUNTING: |
| case MOUNT_MOUNTING_DONE: |
| case MOUNT_REMOUNTING: |
| /* If we are still waiting for /bin/mount, we go directly into kill mode. */ |
| mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS); |
| return 0; |
| |
| case MOUNT_REMOUNTING_SIGTERM: |
| /* If we are already waiting for a hung remount, convert this to the matching unmounting state */ |
| mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM); |
| return 0; |
| |
| case MOUNT_REMOUNTING_SIGKILL: |
| /* as above */ |
| mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL); |
| return 0; |
| |
| case MOUNT_MOUNTED: |
| mount_enter_unmounting(m); |
| return 1; |
| |
| default: |
| assert_not_reached("Unexpected state."); |
| } |
| } |
| |
| static int mount_reload(Unit *u) { |
| Mount *m = MOUNT(u); |
| |
| assert(m); |
| 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_may_gc(Unit *u) { |
| Mount *m = MOUNT(u); |
| |
| assert(m); |
| |
| if (m->from_proc_self_mountinfo) |
| return false; |
| |
| return true; |
| } |
| |
| 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; |
| |
| /* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether |
| * they established/remove a mount. This is important when mounting, but even more so when unmounting |
| * since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat |
| * the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from |
| * the mount() or umount() syscalls, and thus we should see the changes to the proc file before we |
| * process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we |
| * have to waitid() for processes using P_ALL (since we need to reap unexpected children that got |
| * reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just |
| * instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might |
| * have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for |
| * processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that |
| * race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount |
| * dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see |
| * /proc/self/mountinfo changes before our mount/umount exits. */ |
| (void) mount_process_proc_self_mountinfo(u->manager); |
| |
| 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 (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM)) |
| mount_set_reload_result(m, f); |
| else 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 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. */ |
| |
| switch (m->state) { |
| |
| case MOUNT_MOUNTING: |
| /* Our mount point has not appeared in mountinfo. Something went wrong. */ |
| |
| if (f == MOUNT_SUCCESS) { |
| /* Either /bin/mount has an unexpected definition of success, |
| * or someone raced us and we lost. */ |
| log_unit_warning(UNIT(m), "Mount process finished, but there is no mount."); |
| f = MOUNT_FAILURE_PROTOCOL; |
| } |
| mount_enter_dead(m, f); |
| break; |
| |
| case MOUNT_MOUNTING_DONE: |
| mount_enter_mounted(m, f); |
| break; |
| |
| case MOUNT_REMOUNTING: |
| case MOUNT_REMOUNTING_SIGTERM: |
| case MOUNT_REMOUNTING_SIGKILL: |
| mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); |
| break; |
| |
| case MOUNT_UNMOUNTING: |
| |
| if (f == MOUNT_SUCCESS && 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. We might exceed the timeout specified by the user overall, |
| * but we will stop as soon as any one umount times out. */ |
| |
| 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_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount); |
| mount_enter_mounted(m, f); |
| } |
| } else |
| mount_enter_dead_or_mounted(m, f); |
| |
| break; |
| |
| case MOUNT_UNMOUNTING_SIGKILL: |
| case MOUNT_UNMOUNTING_SIGTERM: |
| mount_enter_dead_or_mounted(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. Terminating."); |
| mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT); |
| break; |
| |
| case MOUNT_REMOUNTING: |
| log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process."); |
| mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); |
| mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS); |
| break; |
| |
| case MOUNT_REMOUNTING_SIGTERM: |
| mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); |
| |
| if (m->kill_context.send_sigkill) { |
| log_unit_warning(UNIT(m), "Remounting timed out. Killing."); |
| mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS); |
| } else { |
| log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring."); |
| mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); |
| } |
| break; |
| |
| case MOUNT_REMOUNTING_SIGKILL: |
| mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); |
| |
| log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring."); |
| mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); |
| break; |
| |
| case MOUNT_UNMOUNTING: |
| log_unit_warning(UNIT(m), "Unmounting timed out. Terminating."); |
| mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT); |
| break; |
| |
| case MOUNT_UNMOUNTING_SIGTERM: |
| if (m->kill_context.send_sigkill) { |
| log_unit_warning(UNIT(m), "Mount process timed out. Killing."); |
| mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT); |
| } else { |
| log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring."); |
| mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT); |
| } |
| break; |
| |
| case MOUNT_UNMOUNTING_SIGKILL: |
| log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring."); |
| mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT); |
| break; |
| |
| default: |
| assert_not_reached("Timeout at wrong time."); |
| } |
| |
| return 0; |
| } |
| |
| typedef struct { |
| bool is_mounted; |
| bool just_mounted; |
| bool just_changed; |
| } MountSetupFlags; |
| |
| static int mount_setup_new_unit( |
| Unit *u, |
| const char *what, |
| const char *where, |
| const char *options, |
| const char *fstype, |
| MountSetupFlags *flags) { |
| |
| MountParameters *p; |
| |
| assert(u); |
| assert(flags); |
| |
| u->source_path = strdup("/proc/self/mountinfo"); |
| MOUNT(u)->where = strdup(where); |
| if (!u->source_path || !MOUNT(u)->where) |
| return -ENOMEM; |
| |
| /* Make sure to initialize those fields before mount_is_extrinsic(). */ |
| MOUNT(u)->from_proc_self_mountinfo = true; |
| p = &MOUNT(u)->parameters_proc_self_mountinfo; |
| |
| p->what = strdup(what); |
| p->options = strdup(options); |
| p->fstype = strdup(fstype); |
| if (!p->what || !p->options || !p->fstype) |
| return -ENOMEM; |
| |
| if (!mount_is_extrinsic(MOUNT(u))) { |
| const char *target; |
| int r; |
| |
| target = mount_is_network(p) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET; |
| r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT); |
| if (r < 0) |
| return r; |
| |
| r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT); |
| if (r < 0) |
| return r; |
| } |
| |
| unit_add_to_load_queue(u); |
| flags->is_mounted = true; |
| flags->just_mounted = true; |
| flags->just_changed = true; |
| |
| return 0; |
| } |
| |
| static int mount_setup_existing_unit( |
| Unit *u, |
| const char *what, |
| const char *where, |
| const char *options, |
| const char *fstype, |
| MountSetupFlags *flags) { |
| |
| MountParameters *p; |
| bool load_extras = false; |
| int r1, r2, r3; |
| |
| assert(u); |
| assert(flags); |
| |
| if (!MOUNT(u)->where) { |
| MOUNT(u)->where = strdup(where); |
| if (!MOUNT(u)->where) |
| return -ENOMEM; |
| } |
| |
| /* Make sure to initialize those fields before mount_is_extrinsic(). */ |
| p = &MOUNT(u)->parameters_proc_self_mountinfo; |
| |
| r1 = free_and_strdup(&p->what, what); |
| r2 = free_and_strdup(&p->options, options); |
| r3 = free_and_strdup(&p->fstype, fstype); |
| if (r1 < 0 || r2 < 0 || r3 < 0) |
| return -ENOMEM; |
| |
| flags->just_changed = r1 > 0 || r2 > 0 || r3 > 0; |
| flags->is_mounted = true; |
| flags->just_mounted = !MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->just_mounted; |
| |
| MOUNT(u)->from_proc_self_mountinfo = true; |
| |
| if (!mount_is_extrinsic(MOUNT(u)) && mount_is_network(p)) { |
| /* _netdev option may have shown up late, or on a |
| * remount. Add remote-fs dependencies, even though |
| * local-fs ones may already be there. |
| * |
| * Note: due to a current limitation (we don't track |
| * in the dependency "Set*" objects who created a |
| * dependency), we can only add deps, never lose them, |
| * until the next full daemon-reload. */ |
| unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT); |
| 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 */ |
| |
| /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */ |
| load_extras = true; |
| flags->just_changed = true; |
| } |
| |
| if (load_extras) |
| return mount_add_extras(MOUNT(u)); |
| |
| 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; |
| MountSetupFlags flags; |
| 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) { |
| /* First time we see this mount point meaning that it's |
| * not been initiated by a mount unit but rather by the |
| * sysadmin having called mount(8) directly. */ |
| r = unit_new_for_name(m, sizeof(Mount), e, &u); |
| if (r < 0) |
| goto fail; |
| |
| r = mount_setup_new_unit(u, what, where, options, fstype, &flags); |
| if (r < 0) |
| unit_free(u); |
| } else |
| r = mount_setup_existing_unit(u, what, where, options, fstype, &flags); |
| |
| if (r < 0) |
| goto fail; |
| |
| if (set_flags) { |
| MOUNT(u)->is_mounted = flags.is_mounted; |
| MOUNT(u)->just_mounted = flags.just_mounted; |
| MOUNT(u)->just_changed = flags.just_changed; |
| } |
| |
| if (flags.just_changed) |
| unit_add_to_dbus_queue(u); |
| |
| return 0; |
| fail: |
| log_warning_errno(r, "Failed to set up mount unit: %m"); |
| 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(); |
| i = mnt_new_iter(MNT_ITER_FORWARD); |
| if (!t || !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 (;;) { |
| struct libmnt_fs *fs; |
| const char *device, *path, *options, *fstype; |
| _cleanup_free_ char *d = NULL, *p = NULL; |
| 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(); |
| |
| device_found_node(m, d, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT); |
| |
| 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 void mount_enumerate_perpetual(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) { |
| log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m"); |
| return; |
| } |
| } |
| |
| u->perpetual = true; |
| MOUNT(u)->deserialized_state = MOUNT_MOUNTED; |
| |
| unit_add_to_load_queue(u); |
| unit_add_to_dbus_queue(u); |
| } |
| |
| 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); |
| |
| 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, SD_EVENT_PRIORITY_NORMAL-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 drain_libmount(Manager *m) { |
| bool rescan = false; |
| int r; |
| |
| assert(m); |
| |
| /* 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: r == 1 */ |
| do { |
| r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL); |
| if (r < 0) |
| return log_error_errno(r, "Failed to drain libmount events: %m"); |
| if (r == 0) |
| rescan = true; |
| } while (r == 0); |
| |
| return rescan; |
| } |
| |
| static int mount_process_proc_self_mountinfo(Manager *m) { |
| _cleanup_set_free_ Set *around = NULL, *gone = NULL; |
| const char *what; |
| Iterator i; |
| Unit *u; |
| int r; |
| |
| assert(m); |
| |
| r = drain_libmount(m); |
| if (r <= 0) |
| return r; |
| |
| 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, &path_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, &path_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 */ |
| device_found_node(m, what, 0, DEVICE_FOUND_MOUNT); |
| } |
| |
| return 0; |
| } |
| |
| static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
| Manager *m = userdata; |
| |
| assert(m); |
| assert(revents & EPOLLIN); |
| |
| return mount_process_proc_self_mountinfo(m); |
| } |
| |
| 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) { |
| Mount *m = MOUNT(u); |
| |
| assert(m); |
| |
| 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", |
| [MOUNT_FAILURE_PROTOCOL] = "protocol", |
| }; |
| |
| 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, |
| |
| .may_gc = mount_may_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_perpetual = mount_enumerate_perpetual, |
| .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.", |
| }, |
| }, |
| }; |