| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <limits.h> |
| #include <linux/auto_dev-ioctl.h> |
| #include <linux/auto_fs4.h> |
| #include <sys/epoll.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| #include "alloc-util.h" |
| #include "async.h" |
| #include "automount.h" |
| #include "bus-error.h" |
| #include "bus-util.h" |
| #include "dbus-automount.h" |
| #include "dbus-unit.h" |
| #include "fd-util.h" |
| #include "format-util.h" |
| #include "fstab-util.h" |
| #include "io-util.h" |
| #include "label.h" |
| #include "mkdir-label.h" |
| #include "mount-util.h" |
| #include "mount.h" |
| #include "mountpoint-util.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "process-util.h" |
| #include "serialize.h" |
| #include "special.h" |
| #include "stdio-util.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "unit-name.h" |
| #include "unit.h" |
| |
| static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = { |
| [AUTOMOUNT_DEAD] = UNIT_INACTIVE, |
| [AUTOMOUNT_WAITING] = UNIT_ACTIVE, |
| [AUTOMOUNT_RUNNING] = UNIT_ACTIVE, |
| [AUTOMOUNT_FAILED] = UNIT_FAILED |
| }; |
| |
| struct expire_data { |
| int dev_autofs_fd; |
| int ioctl_fd; |
| }; |
| |
| static struct expire_data* expire_data_free(struct expire_data *data) { |
| if (!data) |
| return NULL; |
| |
| safe_close(data->dev_autofs_fd); |
| safe_close(data->ioctl_fd); |
| return mfree(data); |
| } |
| |
| DEFINE_TRIVIAL_CLEANUP_FUNC(struct expire_data*, expire_data_free); |
| |
| static int open_dev_autofs(Manager *m); |
| static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, void *userdata); |
| static int automount_start_expire(Automount *a); |
| static void automount_stop_expire(Automount *a); |
| static int automount_send_ready(Automount *a, Set *tokens, int status); |
| |
| static void automount_init(Unit *u) { |
| Automount *a = AUTOMOUNT(u); |
| |
| assert(a); |
| assert(u); |
| assert(u->load_state == UNIT_STUB); |
| |
| a->pipe_fd = -EBADF; |
| a->directory_mode = 0755; |
| UNIT(a)->ignore_on_isolate = true; |
| } |
| |
| static void unmount_autofs(Automount *a) { |
| int r; |
| |
| assert(a); |
| |
| if (a->pipe_fd < 0) |
| return; |
| |
| a->pipe_event_source = sd_event_source_disable_unref(a->pipe_event_source); |
| a->pipe_fd = safe_close(a->pipe_fd); |
| |
| /* If we reload/reexecute things we keep the mount point around */ |
| if (!IN_SET(UNIT(a)->manager->objective, MANAGER_RELOAD, MANAGER_REEXECUTE)) { |
| |
| automount_send_ready(a, a->tokens, -EHOSTDOWN); |
| automount_send_ready(a, a->expire_tokens, -EHOSTDOWN); |
| |
| if (a->where) { |
| r = repeat_unmount(a->where, MNT_DETACH|UMOUNT_NOFOLLOW); |
| if (r < 0) |
| log_error_errno(r, "Failed to unmount: %m"); |
| } |
| } |
| } |
| |
| static void automount_done(Unit *u) { |
| Automount *a = AUTOMOUNT(u); |
| |
| assert(a); |
| |
| unmount_autofs(a); |
| |
| a->where = mfree(a->where); |
| a->extra_options = mfree(a->extra_options); |
| |
| a->tokens = set_free(a->tokens); |
| a->expire_tokens = set_free(a->expire_tokens); |
| |
| a->expire_event_source = sd_event_source_disable_unref(a->expire_event_source); |
| } |
| |
| static int automount_add_trigger_dependencies(Automount *a) { |
| Unit *x; |
| int r; |
| |
| assert(a); |
| |
| r = unit_load_related_unit(UNIT(a), ".mount", &x); |
| if (r < 0) |
| return r; |
| |
| return unit_add_two_dependencies(UNIT(a), UNIT_BEFORE, UNIT_TRIGGERS, x, true, UNIT_DEPENDENCY_IMPLICIT); |
| } |
| |
| static int automount_add_mount_dependencies(Automount *a) { |
| _cleanup_free_ char *parent = NULL; |
| int r; |
| |
| assert(a); |
| |
| r = path_extract_directory(a->where, &parent); |
| if (r < 0) |
| return r; |
| |
| return unit_require_mounts_for(UNIT(a), parent, UNIT_DEPENDENCY_IMPLICIT); |
| } |
| |
| static int automount_add_default_dependencies(Automount *a) { |
| int r; |
| |
| assert(a); |
| |
| if (!UNIT(a)->default_dependencies) |
| return 0; |
| |
| if (!MANAGER_IS_SYSTEM(UNIT(a)->manager)) |
| return 0; |
| |
| r = unit_add_dependency_by_name(UNIT(a), UNIT_BEFORE, SPECIAL_LOCAL_FS_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
| if (r < 0) |
| return r; |
| |
| r = unit_add_dependency_by_name(UNIT(a), UNIT_AFTER, SPECIAL_LOCAL_FS_PRE_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
| if (r < 0) |
| return r; |
| |
| r = unit_add_two_dependencies_by_name(UNIT(a), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static int automount_verify(Automount *a) { |
| static const char *const reserved_options[] = { |
| "fd\0", |
| "pgrp\0", |
| "minproto\0", |
| "maxproto\0", |
| "direct\0", |
| "indirect\0", |
| }; |
| |
| _cleanup_free_ char *e = NULL; |
| int r; |
| |
| assert(a); |
| assert(UNIT(a)->load_state == UNIT_LOADED); |
| |
| if (path_equal(a->where, "/")) |
| return log_unit_error_errno(UNIT(a), SYNTHETIC_ERRNO(ENOEXEC), "Cannot have an automount unit for the root directory. Refusing."); |
| |
| r = unit_name_from_path(a->where, ".automount", &e); |
| if (r < 0) |
| return log_unit_error_errno(UNIT(a), r, "Failed to generate unit name from path: %m"); |
| |
| if (!unit_has_name(UNIT(a), e)) |
| return log_unit_error_errno(UNIT(a), SYNTHETIC_ERRNO(ENOEXEC), "Where= setting doesn't match unit name. Refusing."); |
| |
| for (size_t i = 0; i < ELEMENTSOF(reserved_options); i++) |
| if (fstab_test_option(a->extra_options, reserved_options[i])) |
| return log_unit_error_errno( |
| UNIT(a), |
| SYNTHETIC_ERRNO(ENOEXEC), |
| "ExtraOptions= setting may not contain reserved option %s.", |
| reserved_options[i]); |
| |
| return 0; |
| } |
| |
| static int automount_set_where(Automount *a) { |
| int r; |
| |
| assert(a); |
| |
| if (a->where) |
| return 0; |
| |
| r = unit_name_to_path(UNIT(a)->id, &a->where); |
| if (r < 0) |
| return r; |
| |
| path_simplify(a->where); |
| return 1; |
| } |
| |
| static int automount_add_extras(Automount *a) { |
| int r; |
| |
| r = automount_set_where(a); |
| if (r < 0) |
| return r; |
| |
| r = automount_add_trigger_dependencies(a); |
| if (r < 0) |
| return r; |
| |
| r = automount_add_mount_dependencies(a); |
| if (r < 0) |
| return r; |
| |
| return automount_add_default_dependencies(a); |
| } |
| |
| static int automount_load(Unit *u) { |
| Automount *a = AUTOMOUNT(u); |
| int r; |
| |
| assert(u); |
| assert(u->load_state == UNIT_STUB); |
| |
| /* Load a .automount file */ |
| r = unit_load_fragment_and_dropin(u, true); |
| if (r < 0) |
| return r; |
| |
| if (u->load_state != UNIT_LOADED) |
| return 0; |
| |
| r = automount_add_extras(a); |
| if (r < 0) |
| return r; |
| |
| return automount_verify(a); |
| } |
| |
| static void automount_set_state(Automount *a, AutomountState state) { |
| AutomountState old_state; |
| assert(a); |
| |
| if (a->state != state) |
| bus_unit_send_pending_change_signal(UNIT(a), false); |
| |
| old_state = a->state; |
| a->state = state; |
| |
| if (state != AUTOMOUNT_RUNNING) |
| automount_stop_expire(a); |
| |
| if (!IN_SET(state, AUTOMOUNT_WAITING, AUTOMOUNT_RUNNING)) |
| unmount_autofs(a); |
| |
| if (state != old_state) |
| log_unit_debug(UNIT(a), "Changed %s -> %s", automount_state_to_string(old_state), automount_state_to_string(state)); |
| |
| unit_notify(UNIT(a), state_translation_table[old_state], state_translation_table[state], 0); |
| } |
| |
| static int automount_coldplug(Unit *u) { |
| Automount *a = AUTOMOUNT(u); |
| int r; |
| |
| assert(a); |
| assert(a->state == AUTOMOUNT_DEAD); |
| |
| if (a->deserialized_state == a->state) |
| return 0; |
| |
| if (IN_SET(a->deserialized_state, AUTOMOUNT_WAITING, AUTOMOUNT_RUNNING)) { |
| |
| r = automount_set_where(a); |
| if (r < 0) |
| return r; |
| |
| r = open_dev_autofs(u->manager); |
| if (r < 0) |
| return r; |
| |
| assert(a->pipe_fd >= 0); |
| |
| r = sd_event_add_io(u->manager->event, &a->pipe_event_source, a->pipe_fd, EPOLLIN, automount_dispatch_io, u); |
| if (r < 0) |
| return r; |
| |
| (void) sd_event_source_set_description(a->pipe_event_source, "automount-io"); |
| if (a->deserialized_state == AUTOMOUNT_RUNNING) { |
| r = automount_start_expire(a); |
| if (r < 0) |
| log_unit_warning_errno(UNIT(a), r, "Failed to start expiration timer, ignoring: %m"); |
| } |
| |
| automount_set_state(a, a->deserialized_state); |
| } |
| |
| return 0; |
| } |
| |
| static void automount_dump(Unit *u, FILE *f, const char *prefix) { |
| Automount *a = AUTOMOUNT(u); |
| |
| assert(a); |
| |
| fprintf(f, |
| "%sAutomount State: %s\n" |
| "%sResult: %s\n" |
| "%sWhere: %s\n" |
| "%sExtraOptions: %s\n" |
| "%sDirectoryMode: %04o\n" |
| "%sTimeoutIdleUSec: %s\n", |
| prefix, automount_state_to_string(a->state), |
| prefix, automount_result_to_string(a->result), |
| prefix, a->where, |
| prefix, a->extra_options, |
| prefix, a->directory_mode, |
| prefix, FORMAT_TIMESPAN(a->timeout_idle_usec, USEC_PER_SEC)); |
| } |
| |
| static void automount_enter_dead(Automount *a, AutomountResult f) { |
| assert(a); |
| |
| if (a->result == AUTOMOUNT_SUCCESS) |
| a->result = f; |
| |
| unit_log_result(UNIT(a), a->result == AUTOMOUNT_SUCCESS, automount_result_to_string(a->result)); |
| automount_set_state(a, a->result != AUTOMOUNT_SUCCESS ? AUTOMOUNT_FAILED : AUTOMOUNT_DEAD); |
| } |
| |
| static int open_dev_autofs(Manager *m) { |
| struct autofs_dev_ioctl param; |
| |
| assert(m); |
| |
| if (m->dev_autofs_fd >= 0) |
| return m->dev_autofs_fd; |
| |
| (void) label_fix("/dev/autofs", 0); |
| |
| m->dev_autofs_fd = open("/dev/autofs", O_CLOEXEC|O_RDONLY); |
| if (m->dev_autofs_fd < 0) |
| return log_error_errno(errno, "Failed to open /dev/autofs: %m"); |
| |
| init_autofs_dev_ioctl(¶m); |
| if (ioctl(m->dev_autofs_fd, AUTOFS_DEV_IOCTL_VERSION, ¶m) < 0) { |
| m->dev_autofs_fd = safe_close(m->dev_autofs_fd); |
| return -errno; |
| } |
| |
| log_debug("Autofs kernel version %u.%u", param.ver_major, param.ver_minor); |
| |
| return m->dev_autofs_fd; |
| } |
| |
| static int open_ioctl_fd(int dev_autofs_fd, const char *where, dev_t devid) { |
| struct autofs_dev_ioctl *param; |
| size_t l; |
| |
| assert(dev_autofs_fd >= 0); |
| assert(where); |
| |
| l = sizeof(struct autofs_dev_ioctl) + strlen(where) + 1; |
| param = alloca_safe(l); |
| |
| init_autofs_dev_ioctl(param); |
| param->size = l; |
| param->ioctlfd = -EBADF; |
| param->openmount.devid = devid; |
| strcpy(param->path, where); |
| |
| if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_OPENMOUNT, param) < 0) |
| return -errno; |
| |
| if (param->ioctlfd < 0) |
| return -EIO; |
| |
| (void) fd_cloexec(param->ioctlfd, true); |
| return param->ioctlfd; |
| } |
| |
| static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) { |
| uint32_t major, minor; |
| struct autofs_dev_ioctl param; |
| |
| assert(dev_autofs_fd >= 0); |
| assert(ioctl_fd >= 0); |
| |
| init_autofs_dev_ioctl(¶m); |
| param.ioctlfd = ioctl_fd; |
| |
| if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOVER, ¶m) < 0) |
| return -errno; |
| |
| major = param.protover.version; |
| |
| init_autofs_dev_ioctl(¶m); |
| param.ioctlfd = ioctl_fd; |
| |
| if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOSUBVER, ¶m) < 0) |
| return -errno; |
| |
| minor = param.protosubver.sub_version; |
| |
| log_debug("Autofs protocol version %u.%u", major, minor); |
| return 0; |
| } |
| |
| static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, usec_t usec) { |
| struct autofs_dev_ioctl param; |
| |
| assert(dev_autofs_fd >= 0); |
| assert(ioctl_fd >= 0); |
| |
| init_autofs_dev_ioctl(¶m); |
| param.ioctlfd = ioctl_fd; |
| |
| if (usec == USEC_INFINITY) |
| param.timeout.timeout = 0; |
| else |
| /* Convert to seconds, rounding up. */ |
| param.timeout.timeout = DIV_ROUND_UP(usec, USEC_PER_SEC); |
| |
| return RET_NERRNO(ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, ¶m)); |
| } |
| |
| static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, int status) { |
| struct autofs_dev_ioctl param; |
| |
| assert(dev_autofs_fd >= 0); |
| assert(ioctl_fd >= 0); |
| |
| init_autofs_dev_ioctl(¶m); |
| param.ioctlfd = ioctl_fd; |
| |
| if (status != 0) { |
| param.fail.token = token; |
| param.fail.status = status; |
| } else |
| param.ready.token = token; |
| |
| return RET_NERRNO(ioctl(dev_autofs_fd, status ? AUTOFS_DEV_IOCTL_FAIL : AUTOFS_DEV_IOCTL_READY, ¶m)); |
| } |
| |
| static int automount_send_ready(Automount *a, Set *tokens, int status) { |
| _cleanup_close_ int ioctl_fd = -EBADF; |
| unsigned token; |
| int r; |
| |
| assert(a); |
| assert(status <= 0); |
| |
| if (set_isempty(tokens)) |
| return 0; |
| |
| ioctl_fd = open_ioctl_fd(UNIT(a)->manager->dev_autofs_fd, a->where, a->dev_id); |
| if (ioctl_fd < 0) |
| return ioctl_fd; |
| |
| if (status != 0) |
| log_unit_debug_errno(UNIT(a), status, "Sending failure: %m"); |
| else |
| log_unit_debug(UNIT(a), "Sending success."); |
| |
| r = 0; |
| |
| /* Autofs thankfully does not hand out 0 as a token */ |
| while ((token = PTR_TO_UINT(set_steal_first(tokens)))) { |
| int k; |
| |
| /* Autofs fun fact: |
| * |
| * if you pass a positive status code here, kernels |
| * prior to 4.12 will freeze! Yay! */ |
| |
| k = autofs_send_ready(UNIT(a)->manager->dev_autofs_fd, |
| ioctl_fd, |
| token, |
| status); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static void automount_trigger_notify(Unit *u, Unit *other) { |
| Automount *a = AUTOMOUNT(u); |
| int r; |
| |
| assert(a); |
| assert(other); |
| |
| /* Filter out invocations with bogus state */ |
| assert(UNIT_IS_LOAD_COMPLETE(other->load_state)); |
| assert(other->type == UNIT_MOUNT); |
| |
| /* Don't propagate state changes from the mount if we are already down */ |
| if (!IN_SET(a->state, AUTOMOUNT_WAITING, AUTOMOUNT_RUNNING)) |
| return; |
| |
| /* Propagate start limit hit state */ |
| if (other->start_limit_hit) { |
| automount_enter_dead(a, AUTOMOUNT_FAILURE_MOUNT_START_LIMIT_HIT); |
| return; |
| } |
| |
| /* Don't propagate anything if there's still a job queued */ |
| if (other->job) |
| return; |
| |
| /* The mount is successfully established */ |
| if (IN_SET(MOUNT(other)->state, MOUNT_MOUNTED, MOUNT_REMOUNTING)) { |
| (void) automount_send_ready(a, a->tokens, 0); |
| |
| r = automount_start_expire(a); |
| if (r < 0) |
| log_unit_warning_errno(UNIT(a), r, "Failed to start expiration timer, ignoring: %m"); |
| |
| automount_set_state(a, AUTOMOUNT_RUNNING); |
| } |
| |
| if (IN_SET(MOUNT(other)->state, |
| MOUNT_MOUNTING, MOUNT_MOUNTING_DONE, |
| MOUNT_MOUNTED, MOUNT_REMOUNTING, |
| MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL, |
| MOUNT_UNMOUNTING_SIGTERM, MOUNT_UNMOUNTING_SIGKILL, |
| MOUNT_FAILED)) |
| (void) automount_send_ready(a, a->expire_tokens, -ENODEV); |
| |
| if (MOUNT(other)->state == MOUNT_DEAD) |
| (void) automount_send_ready(a, a->expire_tokens, 0); |
| |
| /* The mount is in some unhappy state now, let's unfreeze any waiting clients */ |
| if (IN_SET(MOUNT(other)->state, |
| MOUNT_DEAD, MOUNT_UNMOUNTING, |
| MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL, |
| MOUNT_UNMOUNTING_SIGTERM, MOUNT_UNMOUNTING_SIGKILL, |
| MOUNT_FAILED)) { |
| |
| (void) automount_send_ready(a, a->tokens, -ENODEV); |
| |
| automount_set_state(a, AUTOMOUNT_WAITING); |
| } |
| } |
| |
| static void automount_enter_waiting(Automount *a) { |
| _cleanup_close_ int ioctl_fd = -EBADF; |
| int pipe_fd[2] = PIPE_EBADF; |
| char name[STRLEN("systemd-") + DECIMAL_STR_MAX(pid_t) + 1]; |
| _cleanup_free_ char *options = NULL; |
| bool mounted = false; |
| int r, dev_autofs_fd; |
| struct stat st; |
| |
| assert(a); |
| assert(a->pipe_fd < 0); |
| assert(a->where); |
| |
| set_clear(a->tokens); |
| |
| r = unit_fail_if_noncanonical(UNIT(a), a->where); |
| if (r < 0) |
| goto fail; |
| |
| (void) mkdir_p_label(a->where, a->directory_mode); |
| |
| unit_warn_if_dir_nonempty(UNIT(a), a->where); |
| |
| dev_autofs_fd = open_dev_autofs(UNIT(a)->manager); |
| if (dev_autofs_fd < 0) { |
| r = dev_autofs_fd; |
| goto fail; |
| } |
| |
| if (pipe2(pipe_fd, O_CLOEXEC) < 0) { |
| r = -errno; |
| goto fail; |
| } |
| r = fd_nonblock(pipe_fd[0], true); |
| if (r < 0) |
| goto fail; |
| |
| if (asprintf( |
| &options, |
| "fd=%i,pgrp="PID_FMT",minproto=5,maxproto=5,direct%s%s", |
| pipe_fd[1], |
| getpgrp(), |
| isempty(a->extra_options) ? "" : ",", |
| strempty(a->extra_options)) < 0) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| xsprintf(name, "systemd-"PID_FMT, getpid_cached()); |
| r = mount_nofollow(name, a->where, "autofs", 0, options); |
| if (r < 0) |
| goto fail; |
| |
| mounted = true; |
| |
| pipe_fd[1] = safe_close(pipe_fd[1]); |
| |
| if (stat(a->where, &st) < 0) { |
| r = -errno; |
| goto fail; |
| } |
| |
| ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev); |
| if (ioctl_fd < 0) { |
| r = ioctl_fd; |
| goto fail; |
| } |
| |
| r = autofs_protocol(dev_autofs_fd, ioctl_fd); |
| if (r < 0) |
| goto fail; |
| |
| r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, a->timeout_idle_usec); |
| if (r < 0) |
| goto fail; |
| |
| r = sd_event_add_io(UNIT(a)->manager->event, &a->pipe_event_source, pipe_fd[0], EPOLLIN, automount_dispatch_io, a); |
| if (r < 0) |
| goto fail; |
| |
| (void) sd_event_source_set_description(a->pipe_event_source, "automount-io"); |
| |
| a->pipe_fd = pipe_fd[0]; |
| a->dev_id = st.st_dev; |
| |
| automount_set_state(a, AUTOMOUNT_WAITING); |
| |
| return; |
| |
| fail: |
| log_unit_error_errno(UNIT(a), r, "Failed to initialize automounter: %m"); |
| |
| safe_close_pair(pipe_fd); |
| |
| if (mounted) { |
| r = repeat_unmount(a->where, MNT_DETACH|UMOUNT_NOFOLLOW); |
| if (r < 0) |
| log_error_errno(r, "Failed to unmount, ignoring: %m"); |
| } |
| |
| automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES); |
| } |
| |
| static void *expire_thread(void *p) { |
| struct autofs_dev_ioctl param; |
| _cleanup_(expire_data_freep) struct expire_data *data = p; |
| int r; |
| |
| assert(data->dev_autofs_fd >= 0); |
| assert(data->ioctl_fd >= 0); |
| |
| init_autofs_dev_ioctl(¶m); |
| param.ioctlfd = data->ioctl_fd; |
| |
| do { |
| r = ioctl(data->dev_autofs_fd, AUTOFS_DEV_IOCTL_EXPIRE, ¶m); |
| } while (r >= 0); |
| |
| if (errno != EAGAIN) |
| log_warning_errno(errno, "Failed to expire automount, ignoring: %m"); |
| |
| return NULL; |
| } |
| |
| static int automount_dispatch_expire(sd_event_source *source, usec_t usec, void *userdata) { |
| Automount *a = AUTOMOUNT(userdata); |
| _cleanup_(expire_data_freep) struct expire_data *data = NULL; |
| int r; |
| |
| assert(a); |
| assert(source == a->expire_event_source); |
| |
| data = new0(struct expire_data, 1); |
| if (!data) |
| return log_oom(); |
| |
| data->ioctl_fd = -EBADF; |
| |
| data->dev_autofs_fd = fcntl(UNIT(a)->manager->dev_autofs_fd, F_DUPFD_CLOEXEC, 3); |
| if (data->dev_autofs_fd < 0) |
| return log_unit_error_errno(UNIT(a), errno, "Failed to duplicate autofs fd: %m"); |
| |
| data->ioctl_fd = open_ioctl_fd(UNIT(a)->manager->dev_autofs_fd, a->where, a->dev_id); |
| if (data->ioctl_fd < 0) |
| return log_unit_error_errno(UNIT(a), data->ioctl_fd, "Couldn't open autofs ioctl fd: %m"); |
| |
| r = asynchronous_job(expire_thread, data); |
| if (r < 0) |
| return log_unit_error_errno(UNIT(a), r, "Failed to start expire job: %m"); |
| |
| data = NULL; |
| |
| return automount_start_expire(a); |
| } |
| |
| static int automount_start_expire(Automount *a) { |
| usec_t timeout; |
| int r; |
| |
| assert(a); |
| |
| if (a->timeout_idle_usec == 0) |
| return 0; |
| |
| timeout = MAX(a->timeout_idle_usec/3, USEC_PER_SEC); |
| |
| if (a->expire_event_source) { |
| r = sd_event_source_set_time_relative(a->expire_event_source, timeout); |
| if (r < 0) |
| return r; |
| |
| return sd_event_source_set_enabled(a->expire_event_source, SD_EVENT_ONESHOT); |
| } |
| |
| r = sd_event_add_time_relative( |
| UNIT(a)->manager->event, |
| &a->expire_event_source, |
| CLOCK_MONOTONIC, timeout, 0, |
| automount_dispatch_expire, a); |
| if (r < 0) |
| return r; |
| |
| (void) sd_event_source_set_description(a->expire_event_source, "automount-expire"); |
| |
| return 0; |
| } |
| |
| static void automount_stop_expire(Automount *a) { |
| assert(a); |
| |
| if (!a->expire_event_source) |
| return; |
| |
| (void) sd_event_source_set_enabled(a->expire_event_source, SD_EVENT_OFF); |
| } |
| |
| static void automount_enter_running(Automount *a) { |
| _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
| Unit *trigger; |
| struct stat st; |
| int r; |
| |
| assert(a); |
| |
| /* If the user masked our unit in the meantime, fail */ |
| if (UNIT(a)->load_state != UNIT_LOADED) { |
| log_unit_error(UNIT(a), "Suppressing automount event since unit is no longer loaded."); |
| goto fail; |
| } |
| |
| /* We don't take mount requests anymore if we are supposed to |
| * shut down anyway */ |
| if (unit_stop_pending(UNIT(a))) { |
| log_unit_debug(UNIT(a), "Suppressing automount request since unit stop is scheduled."); |
| automount_send_ready(a, a->tokens, -EHOSTDOWN); |
| automount_send_ready(a, a->expire_tokens, -EHOSTDOWN); |
| return; |
| } |
| |
| (void) mkdir_p_label(a->where, a->directory_mode); |
| |
| /* Before we do anything, let's see if somebody is playing games with us? */ |
| if (lstat(a->where, &st) < 0) { |
| log_unit_warning_errno(UNIT(a), errno, "Failed to stat automount point: %m"); |
| goto fail; |
| } |
| |
| /* The mount unit may have been explicitly started before we got the |
| * autofs request. Ack it to unblock anything waiting on the mount point. */ |
| if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id) { |
| log_unit_info(UNIT(a), "Automount point already active?"); |
| automount_send_ready(a, a->tokens, 0); |
| return; |
| } |
| |
| trigger = UNIT_TRIGGER(UNIT(a)); |
| if (!trigger) { |
| log_unit_error(UNIT(a), "Unit to trigger vanished."); |
| goto fail; |
| } |
| |
| r = manager_add_job(UNIT(a)->manager, JOB_START, trigger, JOB_REPLACE, NULL, &error, NULL); |
| if (r < 0) { |
| log_unit_warning(UNIT(a), "Failed to queue mount startup job: %s", bus_error_message(&error, r)); |
| goto fail; |
| } |
| |
| automount_set_state(a, AUTOMOUNT_RUNNING); |
| return; |
| |
| fail: |
| automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES); |
| } |
| |
| static int automount_start(Unit *u) { |
| Automount *a = AUTOMOUNT(u); |
| int r; |
| |
| assert(a); |
| assert(IN_SET(a->state, AUTOMOUNT_DEAD, AUTOMOUNT_FAILED)); |
| |
| if (path_is_mount_point(a->where, NULL, 0) > 0) |
| return log_unit_error_errno(u, SYNTHETIC_ERRNO(EEXIST), "Path %s is already a mount point, refusing start.", a->where); |
| |
| r = unit_test_trigger_loaded(u); |
| if (r < 0) |
| return r; |
| |
| r = unit_acquire_invocation_id(u); |
| if (r < 0) |
| return r; |
| |
| a->result = AUTOMOUNT_SUCCESS; |
| automount_enter_waiting(a); |
| return 1; |
| } |
| |
| static int automount_stop(Unit *u) { |
| Automount *a = AUTOMOUNT(u); |
| |
| assert(a); |
| assert(IN_SET(a->state, AUTOMOUNT_WAITING, AUTOMOUNT_RUNNING)); |
| |
| automount_enter_dead(a, AUTOMOUNT_SUCCESS); |
| return 1; |
| } |
| |
| static int automount_serialize(Unit *u, FILE *f, FDSet *fds) { |
| Automount *a = AUTOMOUNT(u); |
| void *p; |
| int r; |
| |
| assert(a); |
| assert(f); |
| assert(fds); |
| |
| (void) serialize_item(f, "state", automount_state_to_string(a->state)); |
| (void) serialize_item(f, "result", automount_result_to_string(a->result)); |
| (void) serialize_item_format(f, "dev-id", "%lu", (unsigned long) a->dev_id); |
| |
| SET_FOREACH(p, a->tokens) |
| (void) serialize_item_format(f, "token", "%u", PTR_TO_UINT(p)); |
| SET_FOREACH(p, a->expire_tokens) |
| (void) serialize_item_format(f, "expire-token", "%u", PTR_TO_UINT(p)); |
| |
| r = serialize_fd(f, fds, "pipe-fd", a->pipe_fd); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static int automount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { |
| Automount *a = AUTOMOUNT(u); |
| int r; |
| |
| assert(a); |
| assert(fds); |
| |
| if (streq(key, "state")) { |
| AutomountState state; |
| |
| state = automount_state_from_string(value); |
| if (state < 0) |
| log_unit_debug(u, "Failed to parse state value: %s", value); |
| else |
| a->deserialized_state = state; |
| } else if (streq(key, "result")) { |
| AutomountResult f; |
| |
| f = automount_result_from_string(value); |
| if (f < 0) |
| log_unit_debug(u, "Failed to parse result value: %s", value); |
| else if (f != AUTOMOUNT_SUCCESS) |
| a->result = f; |
| |
| } else if (streq(key, "dev-id")) { |
| unsigned long d; |
| |
| if (safe_atolu(value, &d) < 0) |
| log_unit_debug(u, "Failed to parse dev-id value: %s", value); |
| else |
| a->dev_id = (dev_t) d; |
| |
| } else if (streq(key, "token")) { |
| unsigned token; |
| |
| if (safe_atou(value, &token) < 0) |
| log_unit_debug(u, "Failed to parse token value: %s", value); |
| else { |
| r = set_ensure_put(&a->tokens, NULL, UINT_TO_PTR(token)); |
| if (r < 0) |
| log_unit_error_errno(u, r, "Failed to add token to set: %m"); |
| } |
| } else if (streq(key, "expire-token")) { |
| unsigned token; |
| |
| if (safe_atou(value, &token) < 0) |
| log_unit_debug(u, "Failed to parse token value: %s", value); |
| else { |
| r = set_ensure_put(&a->expire_tokens, NULL, UINT_TO_PTR(token)); |
| if (r < 0) |
| log_unit_error_errno(u, r, "Failed to add expire token to set: %m"); |
| } |
| } else if (streq(key, "pipe-fd")) { |
| int fd; |
| |
| if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) |
| log_unit_debug(u, "Failed to parse pipe-fd value: %s", value); |
| else { |
| safe_close(a->pipe_fd); |
| a->pipe_fd = fdset_remove(fds, fd); |
| } |
| } else |
| log_unit_debug(u, "Unknown serialization key: %s", key); |
| |
| return 0; |
| } |
| |
| static UnitActiveState automount_active_state(Unit *u) { |
| assert(u); |
| |
| return state_translation_table[AUTOMOUNT(u)->state]; |
| } |
| |
| static const char *automount_sub_state_to_string(Unit *u) { |
| assert(u); |
| |
| return automount_state_to_string(AUTOMOUNT(u)->state); |
| } |
| |
| static bool automount_may_gc(Unit *u) { |
| Unit *t; |
| |
| assert(u); |
| |
| t = UNIT_TRIGGER(u); |
| if (!t) |
| return true; |
| |
| return UNIT_VTABLE(t)->may_gc(t); |
| } |
| |
| static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, void *userdata) { |
| _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
| union autofs_v5_packet_union packet; |
| Automount *a = AUTOMOUNT(userdata); |
| Unit *trigger; |
| int r; |
| |
| assert(a); |
| assert(fd == a->pipe_fd); |
| |
| if (events & (EPOLLHUP|EPOLLERR)) { |
| log_unit_error(UNIT(a), "Got hangup/error on autofs pipe from kernel. Likely our automount point has been unmounted by someone or something else?"); |
| automount_enter_dead(a, AUTOMOUNT_FAILURE_UNMOUNTED); |
| return 0; |
| } |
| |
| if (events != EPOLLIN) { |
| log_unit_error(UNIT(a), "Got invalid poll event %"PRIu32" on pipe (fd=%d)", events, fd); |
| goto fail; |
| } |
| |
| r = loop_read_exact(a->pipe_fd, &packet, sizeof(packet), true); |
| if (r < 0) { |
| log_unit_error_errno(UNIT(a), r, "Invalid read from pipe: %m"); |
| goto fail; |
| } |
| |
| switch (packet.hdr.type) { |
| |
| case autofs_ptype_missing_direct: |
| |
| if (packet.v5_packet.pid > 0) { |
| _cleanup_free_ char *p = NULL; |
| |
| (void) get_process_comm(packet.v5_packet.pid, &p); |
| log_unit_info(UNIT(a), "Got automount request for %s, triggered by %"PRIu32" (%s)", a->where, packet.v5_packet.pid, strna(p)); |
| } else |
| log_unit_debug(UNIT(a), "Got direct mount request on %s", a->where); |
| |
| r = set_ensure_put(&a->tokens, NULL, UINT_TO_PTR(packet.v5_packet.wait_queue_token)); |
| if (r < 0) { |
| log_unit_error_errno(UNIT(a), r, "Failed to remember token: %m"); |
| goto fail; |
| } |
| |
| automount_enter_running(a); |
| break; |
| |
| case autofs_ptype_expire_direct: |
| log_unit_debug(UNIT(a), "Got direct umount request on %s", a->where); |
| |
| automount_stop_expire(a); |
| |
| r = set_ensure_put(&a->expire_tokens, NULL, UINT_TO_PTR(packet.v5_packet.wait_queue_token)); |
| if (r < 0) { |
| log_unit_error_errno(UNIT(a), r, "Failed to remember token: %m"); |
| goto fail; |
| } |
| |
| trigger = UNIT_TRIGGER(UNIT(a)); |
| if (!trigger) { |
| log_unit_error(UNIT(a), "Unit to trigger vanished."); |
| goto fail; |
| } |
| |
| r = manager_add_job(UNIT(a)->manager, JOB_STOP, trigger, JOB_REPLACE, NULL, &error, NULL); |
| if (r < 0) { |
| log_unit_warning(UNIT(a), "Failed to queue unmount job: %s", bus_error_message(&error, r)); |
| goto fail; |
| } |
| break; |
| |
| default: |
| log_unit_error(UNIT(a), "Received unknown automount request %i", packet.hdr.type); |
| break; |
| } |
| |
| return 0; |
| |
| fail: |
| automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES); |
| return 0; |
| } |
| |
| static void automount_shutdown(Manager *m) { |
| assert(m); |
| |
| m->dev_autofs_fd = safe_close(m->dev_autofs_fd); |
| } |
| |
| static void automount_reset_failed(Unit *u) { |
| Automount *a = AUTOMOUNT(u); |
| |
| assert(a); |
| |
| if (a->state == AUTOMOUNT_FAILED) |
| automount_set_state(a, AUTOMOUNT_DEAD); |
| |
| a->result = AUTOMOUNT_SUCCESS; |
| } |
| |
| static bool automount_supported(void) { |
| static int supported = -1; |
| |
| if (supported < 0) |
| supported = access("/dev/autofs", F_OK) >= 0; |
| |
| return supported; |
| } |
| |
| static int automount_can_start(Unit *u) { |
| Automount *a = AUTOMOUNT(u); |
| int r; |
| |
| assert(a); |
| |
| r = unit_test_start_limit(u); |
| if (r < 0) { |
| automount_enter_dead(a, AUTOMOUNT_FAILURE_START_LIMIT_HIT); |
| return r; |
| } |
| |
| return 1; |
| } |
| |
| static const char* const automount_result_table[_AUTOMOUNT_RESULT_MAX] = { |
| [AUTOMOUNT_SUCCESS] = "success", |
| [AUTOMOUNT_FAILURE_RESOURCES] = "resources", |
| [AUTOMOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit", |
| [AUTOMOUNT_FAILURE_MOUNT_START_LIMIT_HIT] = "mount-start-limit-hit", |
| [AUTOMOUNT_FAILURE_UNMOUNTED] = "unmounted", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(automount_result, AutomountResult); |
| |
| const UnitVTable automount_vtable = { |
| .object_size = sizeof(Automount), |
| |
| .sections = |
| "Unit\0" |
| "Automount\0" |
| "Install\0", |
| .private_section = "Automount", |
| |
| .can_transient = true, |
| .can_fail = true, |
| .can_trigger = true, |
| .exclude_from_switch_root_serialization = true, |
| |
| .init = automount_init, |
| .load = automount_load, |
| .done = automount_done, |
| |
| .coldplug = automount_coldplug, |
| |
| .dump = automount_dump, |
| |
| .start = automount_start, |
| .stop = automount_stop, |
| |
| .serialize = automount_serialize, |
| .deserialize_item = automount_deserialize_item, |
| |
| .active_state = automount_active_state, |
| .sub_state_to_string = automount_sub_state_to_string, |
| |
| .may_gc = automount_may_gc, |
| |
| .trigger_notify = automount_trigger_notify, |
| |
| .reset_failed = automount_reset_failed, |
| |
| .bus_set_property = bus_automount_set_property, |
| |
| .shutdown = automount_shutdown, |
| .supported = automount_supported, |
| |
| .status_message_formats = { |
| .finished_start_job = { |
| [JOB_DONE] = "Set up automount %s.", |
| [JOB_FAILED] = "Failed to set up automount %s.", |
| }, |
| .finished_stop_job = { |
| [JOB_DONE] = "Unset automount %s.", |
| [JOB_FAILED] = "Failed to unset automount %s.", |
| }, |
| }, |
| |
| .can_start = automount_can_start, |
| }; |
