2 This file is part of systemd.
4 Copyright 2010 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 #include <sys/epoll.h>
25 #include "sd-messages.h"
27 #include "alloc-util.h"
28 #include "dbus-mount.h"
30 #include "exit-status.h"
31 #include "format-util.h"
32 #include "fstab-util.h"
36 #include "mount-setup.h"
37 #include "mount-util.h"
39 #include "parse-util.h"
40 #include "path-util.h"
41 #include "process-util.h"
43 #include "string-table.h"
44 #include "string-util.h"
46 #include "unit-name.h"
49 #define RETRY_UMOUNT_MAX 32
51 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table
*, mnt_free_table
);
52 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter
*, mnt_free_iter
);
54 static const UnitActiveState state_translation_table
[_MOUNT_STATE_MAX
] = {
55 [MOUNT_DEAD
] = UNIT_INACTIVE
,
56 [MOUNT_MOUNTING
] = UNIT_ACTIVATING
,
57 [MOUNT_MOUNTING_DONE
] = UNIT_ACTIVE
,
58 [MOUNT_MOUNTED
] = UNIT_ACTIVE
,
59 [MOUNT_REMOUNTING
] = UNIT_RELOADING
,
60 [MOUNT_UNMOUNTING
] = UNIT_DEACTIVATING
,
61 [MOUNT_MOUNTING_SIGTERM
] = UNIT_DEACTIVATING
,
62 [MOUNT_MOUNTING_SIGKILL
] = UNIT_DEACTIVATING
,
63 [MOUNT_REMOUNTING_SIGTERM
] = UNIT_RELOADING
,
64 [MOUNT_REMOUNTING_SIGKILL
] = UNIT_RELOADING
,
65 [MOUNT_UNMOUNTING_SIGTERM
] = UNIT_DEACTIVATING
,
66 [MOUNT_UNMOUNTING_SIGKILL
] = UNIT_DEACTIVATING
,
67 [MOUNT_FAILED
] = UNIT_FAILED
70 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
);
71 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
);
73 static bool mount_needs_network(const char *options
, const char *fstype
) {
74 if (fstab_test_option(options
, "_netdev\0"))
77 if (fstype
&& fstype_is_network(fstype
))
83 static bool mount_is_network(const MountParameters
*p
) {
86 return mount_needs_network(p
->options
, p
->fstype
);
89 static bool mount_is_loop(const MountParameters
*p
) {
92 if (fstab_test_option(p
->options
, "loop\0"))
98 static bool mount_is_bind(const MountParameters
*p
) {
101 if (fstab_test_option(p
->options
, "bind\0" "rbind\0"))
104 if (p
->fstype
&& STR_IN_SET(p
->fstype
, "bind", "rbind"))
110 static bool mount_is_auto(const MountParameters
*p
) {
113 return !fstab_test_option(p
->options
, "noauto\0");
116 static bool mount_is_automount(const MountParameters
*p
) {
119 return fstab_test_option(p
->options
,
120 "comment=systemd.automount\0"
121 "x-systemd.automount\0");
124 static bool mount_state_active(MountState state
) {
130 MOUNT_MOUNTING_SIGTERM
,
131 MOUNT_MOUNTING_SIGKILL
,
132 MOUNT_UNMOUNTING_SIGTERM
,
133 MOUNT_UNMOUNTING_SIGKILL
,
134 MOUNT_REMOUNTING_SIGTERM
,
135 MOUNT_REMOUNTING_SIGKILL
);
138 static bool mount_is_bound_to_device(const Mount
*m
) {
139 const MountParameters
*p
;
141 if (m
->from_fragment
)
144 p
= &m
->parameters_proc_self_mountinfo
;
145 return fstab_test_option(p
->options
, "x-systemd.device-bound\0");
148 static bool needs_quota(const MountParameters
*p
) {
151 /* Quotas are not enabled on network filesystems,
152 * but we want them, for example, on storage connected via iscsi */
153 if (p
->fstype
&& fstype_is_network(p
->fstype
))
156 if (mount_is_bind(p
))
159 return fstab_test_option(p
->options
,
160 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
163 static void mount_init(Unit
*u
) {
167 assert(u
->load_state
== UNIT_STUB
);
169 m
->timeout_usec
= u
->manager
->default_timeout_start_usec
;
170 m
->directory_mode
= 0755;
172 /* We need to make sure that /usr/bin/mount is always called
173 * in the same process group as us, so that the autofs kernel
174 * side doesn't send us another mount request while we are
175 * already trying to comply its last one. */
176 m
->exec_context
.same_pgrp
= true;
178 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
180 u
->ignore_on_isolate
= true;
183 static int mount_arm_timer(Mount
*m
, usec_t usec
) {
188 if (m
->timer_event_source
) {
189 r
= sd_event_source_set_time(m
->timer_event_source
, usec
);
193 return sd_event_source_set_enabled(m
->timer_event_source
, SD_EVENT_ONESHOT
);
196 if (usec
== USEC_INFINITY
)
199 r
= sd_event_add_time(
200 UNIT(m
)->manager
->event
,
201 &m
->timer_event_source
,
204 mount_dispatch_timer
, m
);
208 (void) sd_event_source_set_description(m
->timer_event_source
, "mount-timer");
213 static void mount_unwatch_control_pid(Mount
*m
) {
216 if (m
->control_pid
<= 0)
219 unit_unwatch_pid(UNIT(m
), m
->control_pid
);
223 static void mount_parameters_done(MountParameters
*p
) {
230 p
->what
= p
->options
= p
->fstype
= NULL
;
233 static void mount_done(Unit
*u
) {
238 m
->where
= mfree(m
->where
);
240 mount_parameters_done(&m
->parameters_proc_self_mountinfo
);
241 mount_parameters_done(&m
->parameters_fragment
);
243 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
);
244 exec_command_done_array(m
->exec_command
, _MOUNT_EXEC_COMMAND_MAX
);
245 m
->control_command
= NULL
;
247 dynamic_creds_unref(&m
->dynamic_creds
);
249 mount_unwatch_control_pid(m
);
251 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
254 _pure_
static MountParameters
* get_mount_parameters_fragment(Mount
*m
) {
257 if (m
->from_fragment
)
258 return &m
->parameters_fragment
;
263 _pure_
static MountParameters
* get_mount_parameters(Mount
*m
) {
266 if (m
->from_proc_self_mountinfo
)
267 return &m
->parameters_proc_self_mountinfo
;
269 return get_mount_parameters_fragment(m
);
272 static int mount_add_mount_links(Mount
*m
) {
273 _cleanup_free_
char *parent
= NULL
;
282 if (!path_equal(m
->where
, "/")) {
283 /* Adds in links to other mount points that might lie further
284 * up in the hierarchy */
286 parent
= dirname_malloc(m
->where
);
290 r
= unit_require_mounts_for(UNIT(m
), parent
);
295 /* Adds in links to other mount points that might be needed
296 * for the source path (if this is a bind mount or a loop mount) to be
298 pm
= get_mount_parameters_fragment(m
);
299 if (pm
&& pm
->what
&&
300 path_is_absolute(pm
->what
) &&
301 (mount_is_bind(pm
) || mount_is_loop(pm
) || !mount_is_network(pm
))) {
303 r
= unit_require_mounts_for(UNIT(m
), pm
->what
);
308 /* Adds in links to other units that use this path or paths
309 * further down in the hierarchy */
310 s
= manager_get_units_requiring_mounts_for(UNIT(m
)->manager
, m
->where
);
311 SET_FOREACH(other
, s
, i
) {
313 if (other
->load_state
!= UNIT_LOADED
)
316 if (other
== UNIT(m
))
319 r
= unit_add_dependency(other
, UNIT_AFTER
, UNIT(m
), true);
323 if (UNIT(m
)->fragment_path
) {
324 /* If we have fragment configuration, then make this dependency required */
325 r
= unit_add_dependency(other
, UNIT_REQUIRES
, UNIT(m
), true);
334 static int mount_add_device_links(Mount
*m
) {
336 bool device_wants_mount
= false;
342 p
= get_mount_parameters(m
);
349 if (mount_is_bind(p
))
352 if (!is_device_path(p
->what
))
355 /* /dev/root is a really weird thing, it's not a real device,
356 * but just a path the kernel exports for the root file system
357 * specified on the kernel command line. Ignore it here. */
358 if (path_equal(p
->what
, "/dev/root"))
361 if (path_equal(m
->where
, "/"))
364 if (mount_is_auto(p
) && !mount_is_automount(p
) && MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
365 device_wants_mount
= true;
367 /* Mount units from /proc/self/mountinfo are not bound to devices
368 * by default since they're subject to races when devices are
369 * unplugged. But the user can still force this dep with an
370 * appropriate option (or udev property) so the mount units are
371 * automatically stopped when the device disappears suddenly. */
372 dep
= mount_is_bound_to_device(m
) ? UNIT_BINDS_TO
: UNIT_REQUIRES
;
374 r
= unit_add_node_link(UNIT(m
), p
->what
, device_wants_mount
, dep
);
381 static int mount_add_quota_links(Mount
*m
) {
387 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
390 p
= get_mount_parameters_fragment(m
);
397 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTACHECK_SERVICE
, NULL
, true);
401 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTAON_SERVICE
, NULL
, true);
408 static bool mount_is_extrinsic(Mount
*m
) {
412 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
413 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
414 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
416 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
)) /* We only automatically manage mounts if we are in system mode */
419 if (PATH_IN_SET(m
->where
, /* Don't bother with the OS data itself */
424 if (PATH_STARTSWITH_SET(m
->where
,
425 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
426 "/proc", /* All of this is API VFS */
427 "/sys", /* … dito … */
428 "/dev")) /* … dito … */
431 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
432 p
= get_mount_parameters(m
);
433 if (p
&& fstab_test_option(p
->options
, "x-initrd.mount\0") && !in_initrd())
439 static int mount_add_default_dependencies(Mount
*m
) {
446 if (!UNIT(m
)->default_dependencies
)
449 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
450 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
451 * file systems, it's also going to be virtual, and hence not worth the effort. */
452 if (mount_is_extrinsic(m
))
455 p
= get_mount_parameters(m
);
459 if (mount_is_network(p
)) {
460 /* We order ourselves after network.target. This is
461 * primarily useful at shutdown: services that take
462 * down the network should order themselves before
463 * network.target, so that they are shut down only
464 * after this mount unit is stopped. */
466 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_NETWORK_TARGET
, NULL
, true);
470 /* We pull in network-online.target, and order
471 * ourselves after it. This is useful at start-up to
472 * actively pull in tools that want to be started
473 * before we start mounting network file systems, and
474 * whose purpose it is to delay this until the network
477 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_WANTS
, UNIT_AFTER
, SPECIAL_NETWORK_ONLINE_TARGET
, NULL
, true);
481 after
= SPECIAL_REMOTE_FS_PRE_TARGET
;
483 after
= SPECIAL_LOCAL_FS_PRE_TARGET
;
485 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, after
, NULL
, true);
489 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true);
496 static int mount_verify(Mount
*m
) {
497 _cleanup_free_
char *e
= NULL
;
503 if (UNIT(m
)->load_state
!= UNIT_LOADED
)
506 if (!m
->from_fragment
&& !m
->from_proc_self_mountinfo
)
509 r
= unit_name_from_path(m
->where
, ".mount", &e
);
511 return log_unit_error_errno(UNIT(m
), r
, "Failed to generate unit name from mount path: %m");
513 if (!unit_has_name(UNIT(m
), e
)) {
514 log_unit_error(UNIT(m
), "Where= setting doesn't match unit name. Refusing.");
518 if (mount_point_is_api(m
->where
) || mount_point_ignore(m
->where
)) {
519 log_unit_error(UNIT(m
), "Cannot create mount unit for API file system %s. Refusing.", m
->where
);
523 p
= get_mount_parameters_fragment(m
);
525 log_unit_error(UNIT(m
), "What= setting is missing. Refusing.");
529 if (m
->exec_context
.pam_name
&& m
->kill_context
.kill_mode
!= KILL_CONTROL_GROUP
) {
530 log_unit_error(UNIT(m
), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
537 static int mount_add_extras(Mount
*m
) {
543 if (u
->fragment_path
)
544 m
->from_fragment
= true;
547 r
= unit_name_to_path(u
->id
, &m
->where
);
552 path_kill_slashes(m
->where
);
554 if (!u
->description
) {
555 r
= unit_set_description(u
, m
->where
);
560 r
= mount_add_device_links(m
);
564 r
= mount_add_mount_links(m
);
568 r
= mount_add_quota_links(m
);
572 r
= unit_patch_contexts(u
);
576 r
= unit_add_exec_dependencies(u
, &m
->exec_context
);
580 r
= unit_set_default_slice(u
);
584 r
= mount_add_default_dependencies(m
);
591 static int mount_load_root_mount(Unit
*u
) {
594 if (!unit_has_name(u
, SPECIAL_ROOT_MOUNT
))
598 u
->default_dependencies
= false;
600 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
601 MOUNT(u
)->exec_context
.std_output
= EXEC_OUTPUT_NULL
;
602 MOUNT(u
)->exec_context
.std_input
= EXEC_INPUT_NULL
;
605 u
->description
= strdup("Root Mount");
610 static int mount_load(Unit
*u
) {
615 assert(u
->load_state
== UNIT_STUB
);
617 r
= mount_load_root_mount(u
);
621 if (m
->from_proc_self_mountinfo
|| u
->perpetual
)
622 r
= unit_load_fragment_and_dropin_optional(u
);
624 r
= unit_load_fragment_and_dropin(u
);
628 /* This is a new unit? Then let's add in some extras */
629 if (u
->load_state
== UNIT_LOADED
) {
630 r
= mount_add_extras(m
);
635 return mount_verify(m
);
638 static void mount_set_state(Mount
*m
, MountState state
) {
639 MountState old_state
;
642 old_state
= m
->state
;
645 if (!mount_state_active(state
)) {
646 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
647 mount_unwatch_control_pid(m
);
648 m
->control_command
= NULL
;
649 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
652 if (state
!= old_state
)
653 log_unit_debug(UNIT(m
), "Changed %s -> %s", mount_state_to_string(old_state
), mount_state_to_string(state
));
655 unit_notify(UNIT(m
), state_translation_table
[old_state
], state_translation_table
[state
], m
->reload_result
== MOUNT_SUCCESS
);
656 m
->reload_result
= MOUNT_SUCCESS
;
659 static int mount_coldplug(Unit
*u
) {
661 MountState new_state
= MOUNT_DEAD
;
665 assert(m
->state
== MOUNT_DEAD
);
667 if (m
->deserialized_state
!= m
->state
)
668 new_state
= m
->deserialized_state
;
669 else if (m
->from_proc_self_mountinfo
)
670 new_state
= MOUNT_MOUNTED
;
672 if (new_state
== m
->state
)
675 if (m
->control_pid
> 0 &&
676 pid_is_unwaited(m
->control_pid
) &&
677 mount_state_active(new_state
)) {
679 r
= unit_watch_pid(UNIT(m
), m
->control_pid
);
683 r
= mount_arm_timer(m
, usec_add(u
->state_change_timestamp
.monotonic
, m
->timeout_usec
));
688 if (!IN_SET(new_state
, MOUNT_DEAD
, MOUNT_FAILED
))
689 (void) unit_setup_dynamic_creds(u
);
691 mount_set_state(m
, new_state
);
695 static void mount_dump(Unit
*u
, FILE *f
, const char *prefix
) {
702 p
= get_mount_parameters(m
);
705 "%sMount State: %s\n"
709 "%sFile System Type: %s\n"
711 "%sFrom /proc/self/mountinfo: %s\n"
712 "%sFrom fragment: %s\n"
714 "%sDirectoryMode: %04o\n"
715 "%sSloppyOptions: %s\n"
716 "%sLazyUnmount: %s\n"
717 "%sForceUnmount: %s\n",
718 prefix
, mount_state_to_string(m
->state
),
719 prefix
, mount_result_to_string(m
->result
),
721 prefix
, p
? strna(p
->what
) : "n/a",
722 prefix
, p
? strna(p
->fstype
) : "n/a",
723 prefix
, p
? strna(p
->options
) : "n/a",
724 prefix
, yes_no(m
->from_proc_self_mountinfo
),
725 prefix
, yes_no(m
->from_fragment
),
726 prefix
, yes_no(mount_is_extrinsic(m
)),
727 prefix
, m
->directory_mode
,
728 prefix
, yes_no(m
->sloppy_options
),
729 prefix
, yes_no(m
->lazy_unmount
),
730 prefix
, yes_no(m
->force_unmount
));
732 if (m
->control_pid
> 0)
734 "%sControl PID: "PID_FMT
"\n",
735 prefix
, m
->control_pid
);
737 exec_context_dump(&m
->exec_context
, f
, prefix
);
738 kill_context_dump(&m
->kill_context
, f
, prefix
);
741 static int mount_spawn(Mount
*m
, ExecCommand
*c
, pid_t
*_pid
) {
744 ExecParameters exec_params
= {
745 .flags
= EXEC_APPLY_PERMISSIONS
|EXEC_APPLY_CHROOT
|EXEC_APPLY_TTY_STDIN
,
755 (void) unit_realize_cgroup(UNIT(m
));
756 if (m
->reset_cpu_usage
) {
757 (void) unit_reset_cpu_usage(UNIT(m
));
758 m
->reset_cpu_usage
= false;
761 r
= unit_setup_exec_runtime(UNIT(m
));
765 r
= unit_setup_dynamic_creds(UNIT(m
));
769 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
773 exec_params
.environment
= UNIT(m
)->manager
->environment
;
774 exec_params
.confirm_spawn
= manager_get_confirm_spawn(UNIT(m
)->manager
);
775 exec_params
.cgroup_supported
= UNIT(m
)->manager
->cgroup_supported
;
776 exec_params
.cgroup_path
= UNIT(m
)->cgroup_path
;
777 exec_params
.cgroup_delegate
= m
->cgroup_context
.delegate
;
778 exec_params
.runtime_prefix
= manager_get_runtime_prefix(UNIT(m
)->manager
);
780 r
= exec_spawn(UNIT(m
),
790 r
= unit_watch_pid(UNIT(m
), pid
);
792 /* FIXME: we need to do something here */
800 static void mount_enter_dead(Mount
*m
, MountResult f
) {
803 if (m
->result
== MOUNT_SUCCESS
)
806 mount_set_state(m
, m
->result
!= MOUNT_SUCCESS
? MOUNT_FAILED
: MOUNT_DEAD
);
808 exec_runtime_destroy(m
->exec_runtime
);
809 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
);
811 exec_context_destroy_runtime_directory(&m
->exec_context
, manager_get_runtime_prefix(UNIT(m
)->manager
));
813 unit_unref_uid_gid(UNIT(m
), true);
815 dynamic_creds_destroy(&m
->dynamic_creds
);
818 static void mount_enter_mounted(Mount
*m
, MountResult f
) {
821 if (m
->result
== MOUNT_SUCCESS
)
824 mount_set_state(m
, MOUNT_MOUNTED
);
827 static void mount_enter_signal(Mount
*m
, MountState state
, MountResult f
) {
832 if (m
->result
== MOUNT_SUCCESS
)
835 r
= unit_kill_context(
838 (state
!= MOUNT_MOUNTING_SIGTERM
&& state
!= MOUNT_UNMOUNTING_SIGTERM
&& state
!= MOUNT_REMOUNTING_SIGTERM
) ?
839 KILL_KILL
: KILL_TERMINATE
,
847 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
851 mount_set_state(m
, state
);
852 } else if (state
== MOUNT_REMOUNTING_SIGTERM
)
853 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
854 else if (state
== MOUNT_REMOUNTING_SIGKILL
)
855 mount_enter_mounted(m
, MOUNT_SUCCESS
);
856 else if (state
== MOUNT_MOUNTING_SIGTERM
)
857 mount_enter_signal(m
, MOUNT_MOUNTING_SIGKILL
, MOUNT_SUCCESS
);
858 else if (state
== MOUNT_UNMOUNTING_SIGTERM
)
859 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
861 mount_enter_dead(m
, MOUNT_SUCCESS
);
866 log_unit_warning_errno(UNIT(m
), r
, "Failed to kill processes: %m");
868 if (IN_SET(state
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_REMOUNTING_SIGKILL
))
869 mount_enter_mounted(m
, MOUNT_FAILURE_RESOURCES
);
871 mount_enter_dead(m
, MOUNT_FAILURE_RESOURCES
);
874 static void mount_enter_unmounting(Mount
*m
) {
879 /* Start counting our attempts */
880 if (!IN_SET(m
->state
,
882 MOUNT_UNMOUNTING_SIGTERM
,
883 MOUNT_UNMOUNTING_SIGKILL
))
884 m
->n_retry_umount
= 0;
886 m
->control_command_id
= MOUNT_EXEC_UNMOUNT
;
887 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_UNMOUNT
;
889 r
= exec_command_set(m
->control_command
, UMOUNT_PATH
, m
->where
, NULL
);
890 if (r
>= 0 && m
->lazy_unmount
)
891 r
= exec_command_append(m
->control_command
, "-l", NULL
);
892 if (r
>= 0 && m
->force_unmount
)
893 r
= exec_command_append(m
->control_command
, "-f", NULL
);
897 mount_unwatch_control_pid(m
);
899 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
903 mount_set_state(m
, MOUNT_UNMOUNTING
);
908 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'umount' task: %m");
909 mount_enter_mounted(m
, MOUNT_FAILURE_RESOURCES
);
912 static void mount_enter_mounting(Mount
*m
) {
918 m
->control_command_id
= MOUNT_EXEC_MOUNT
;
919 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_MOUNT
;
921 r
= unit_fail_if_symlink(UNIT(m
), m
->where
);
925 (void) mkdir_p_label(m
->where
, m
->directory_mode
);
927 unit_warn_if_dir_nonempty(UNIT(m
), m
->where
);
929 /* Create the source directory for bind-mounts if needed */
930 p
= get_mount_parameters_fragment(m
);
931 if (p
&& mount_is_bind(p
))
932 (void) mkdir_p_label(p
->what
, m
->directory_mode
);
935 _cleanup_free_
char *opts
= NULL
;
937 r
= fstab_filter_options(p
->options
, "nofail\0" "noauto\0" "auto\0", NULL
, NULL
, &opts
);
941 r
= exec_command_set(m
->control_command
, MOUNT_PATH
, p
->what
, m
->where
, NULL
);
942 if (r
>= 0 && m
->sloppy_options
)
943 r
= exec_command_append(m
->control_command
, "-s", NULL
);
944 if (r
>= 0 && p
->fstype
)
945 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
946 if (r
>= 0 && !isempty(opts
))
947 r
= exec_command_append(m
->control_command
, "-o", opts
, NULL
);
954 mount_unwatch_control_pid(m
);
956 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
960 mount_set_state(m
, MOUNT_MOUNTING
);
965 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'mount' task: %m");
966 mount_enter_dead(m
, MOUNT_FAILURE_RESOURCES
);
969 static void mount_enter_remounting(Mount
*m
) {
975 m
->control_command_id
= MOUNT_EXEC_REMOUNT
;
976 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_REMOUNT
;
978 p
= get_mount_parameters_fragment(m
);
983 o
= strjoina("remount,", p
->options
);
987 r
= exec_command_set(m
->control_command
, MOUNT_PATH
,
990 if (r
>= 0 && m
->sloppy_options
)
991 r
= exec_command_append(m
->control_command
, "-s", NULL
);
992 if (r
>= 0 && p
->fstype
)
993 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
1000 mount_unwatch_control_pid(m
);
1002 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
1006 mount_set_state(m
, MOUNT_REMOUNTING
);
1011 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'remount' task: %m");
1012 m
->reload_result
= MOUNT_FAILURE_RESOURCES
;
1013 mount_enter_mounted(m
, MOUNT_SUCCESS
);
1016 static int mount_start(Unit
*u
) {
1017 Mount
*m
= MOUNT(u
);
1022 /* We cannot fulfill this request right now, try again later
1024 if (IN_SET(m
->state
,
1026 MOUNT_UNMOUNTING_SIGTERM
,
1027 MOUNT_UNMOUNTING_SIGKILL
,
1028 MOUNT_MOUNTING_SIGTERM
,
1029 MOUNT_MOUNTING_SIGKILL
))
1032 /* Already on it! */
1033 if (m
->state
== MOUNT_MOUNTING
)
1036 assert(IN_SET(m
->state
, MOUNT_DEAD
, MOUNT_FAILED
));
1038 r
= unit_start_limit_test(u
);
1040 mount_enter_dead(m
, MOUNT_FAILURE_START_LIMIT_HIT
);
1044 r
= unit_acquire_invocation_id(u
);
1048 m
->result
= MOUNT_SUCCESS
;
1049 m
->reload_result
= MOUNT_SUCCESS
;
1050 m
->reset_cpu_usage
= true;
1052 mount_enter_mounting(m
);
1056 static int mount_stop(Unit
*u
) {
1057 Mount
*m
= MOUNT(u
);
1062 if (IN_SET(m
->state
,
1064 MOUNT_UNMOUNTING_SIGKILL
,
1065 MOUNT_UNMOUNTING_SIGTERM
,
1066 MOUNT_MOUNTING_SIGTERM
,
1067 MOUNT_MOUNTING_SIGKILL
))
1070 assert(IN_SET(m
->state
,
1072 MOUNT_MOUNTING_DONE
,
1075 MOUNT_REMOUNTING_SIGTERM
,
1076 MOUNT_REMOUNTING_SIGKILL
));
1078 mount_enter_unmounting(m
);
1082 static int mount_reload(Unit
*u
) {
1083 Mount
*m
= MOUNT(u
);
1087 if (m
->state
== MOUNT_MOUNTING_DONE
)
1090 assert(m
->state
== MOUNT_MOUNTED
);
1092 mount_enter_remounting(m
);
1096 static int mount_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
1097 Mount
*m
= MOUNT(u
);
1103 unit_serialize_item(u
, f
, "state", mount_state_to_string(m
->state
));
1104 unit_serialize_item(u
, f
, "result", mount_result_to_string(m
->result
));
1105 unit_serialize_item(u
, f
, "reload-result", mount_result_to_string(m
->reload_result
));
1107 if (m
->control_pid
> 0)
1108 unit_serialize_item_format(u
, f
, "control-pid", PID_FMT
, m
->control_pid
);
1110 if (m
->control_command_id
>= 0)
1111 unit_serialize_item(u
, f
, "control-command", mount_exec_command_to_string(m
->control_command_id
));
1116 static int mount_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
1117 Mount
*m
= MOUNT(u
);
1124 if (streq(key
, "state")) {
1127 if ((state
= mount_state_from_string(value
)) < 0)
1128 log_unit_debug(u
, "Failed to parse state value: %s", value
);
1130 m
->deserialized_state
= state
;
1131 } else if (streq(key
, "result")) {
1134 f
= mount_result_from_string(value
);
1136 log_unit_debug(u
, "Failed to parse result value: %s", value
);
1137 else if (f
!= MOUNT_SUCCESS
)
1140 } else if (streq(key
, "reload-result")) {
1143 f
= mount_result_from_string(value
);
1145 log_unit_debug(u
, "Failed to parse reload result value: %s", value
);
1146 else if (f
!= MOUNT_SUCCESS
)
1147 m
->reload_result
= f
;
1149 } else if (streq(key
, "control-pid")) {
1152 if (parse_pid(value
, &pid
) < 0)
1153 log_unit_debug(u
, "Failed to parse control-pid value: %s", value
);
1155 m
->control_pid
= pid
;
1156 } else if (streq(key
, "control-command")) {
1157 MountExecCommand id
;
1159 id
= mount_exec_command_from_string(value
);
1161 log_unit_debug(u
, "Failed to parse exec-command value: %s", value
);
1163 m
->control_command_id
= id
;
1164 m
->control_command
= m
->exec_command
+ id
;
1167 log_unit_debug(u
, "Unknown serialization key: %s", key
);
1172 _pure_
static UnitActiveState
mount_active_state(Unit
*u
) {
1175 return state_translation_table
[MOUNT(u
)->state
];
1178 _pure_
static const char *mount_sub_state_to_string(Unit
*u
) {
1181 return mount_state_to_string(MOUNT(u
)->state
);
1184 _pure_
static bool mount_check_gc(Unit
*u
) {
1185 Mount
*m
= MOUNT(u
);
1189 return m
->from_proc_self_mountinfo
;
1192 static void mount_sigchld_event(Unit
*u
, pid_t pid
, int code
, int status
) {
1193 Mount
*m
= MOUNT(u
);
1199 if (pid
!= m
->control_pid
)
1204 if (is_clean_exit(code
, status
, EXIT_CLEAN_COMMAND
, NULL
))
1206 else if (code
== CLD_EXITED
)
1207 f
= MOUNT_FAILURE_EXIT_CODE
;
1208 else if (code
== CLD_KILLED
)
1209 f
= MOUNT_FAILURE_SIGNAL
;
1210 else if (code
== CLD_DUMPED
)
1211 f
= MOUNT_FAILURE_CORE_DUMP
;
1213 assert_not_reached("Unknown code");
1215 if (m
->result
== MOUNT_SUCCESS
)
1218 if (m
->control_command
) {
1219 exec_status_exit(&m
->control_command
->exec_status
, &m
->exec_context
, pid
, code
, status
);
1221 m
->control_command
= NULL
;
1222 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
1225 log_unit_full(u
, f
== MOUNT_SUCCESS
? LOG_DEBUG
: LOG_NOTICE
, 0,
1226 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code
), status
);
1228 /* Note that mount(8) returning and the kernel sending us a
1229 * mount table change event might happen out-of-order. If an
1230 * operation succeed we assume the kernel will follow soon too
1231 * and already change into the resulting state. If it fails
1232 * we check if the kernel still knows about the mount. and
1233 * change state accordingly. */
1237 case MOUNT_MOUNTING
:
1238 case MOUNT_MOUNTING_DONE
:
1239 case MOUNT_MOUNTING_SIGKILL
:
1240 case MOUNT_MOUNTING_SIGTERM
:
1242 if (f
== MOUNT_SUCCESS
|| m
->from_proc_self_mountinfo
)
1243 /* If /bin/mount returned success, or if we see the mount point in /proc/self/mountinfo we are
1244 * happy. If we see the first condition first, we should see the the second condition
1245 * immediately after – or /bin/mount lies to us and is broken. */
1246 mount_enter_mounted(m
, f
);
1248 mount_enter_dead(m
, f
);
1251 case MOUNT_REMOUNTING
:
1252 case MOUNT_REMOUNTING_SIGKILL
:
1253 case MOUNT_REMOUNTING_SIGTERM
:
1255 m
->reload_result
= f
;
1256 if (m
->from_proc_self_mountinfo
)
1257 mount_enter_mounted(m
, MOUNT_SUCCESS
);
1259 mount_enter_dead(m
, MOUNT_SUCCESS
);
1263 case MOUNT_UNMOUNTING
:
1264 case MOUNT_UNMOUNTING_SIGKILL
:
1265 case MOUNT_UNMOUNTING_SIGTERM
:
1267 if (f
== MOUNT_SUCCESS
) {
1269 if (m
->from_proc_self_mountinfo
) {
1271 /* Still a mount point? If so, let's
1272 * try again. Most likely there were
1273 * multiple mount points stacked on
1274 * top of each other. Note that due to
1275 * the io event priority logic we can
1276 * be sure the new mountinfo is loaded
1277 * before we process the SIGCHLD for
1278 * the mount command. */
1280 if (m
->n_retry_umount
< RETRY_UMOUNT_MAX
) {
1281 log_unit_debug(u
, "Mount still present, trying again.");
1282 m
->n_retry_umount
++;
1283 mount_enter_unmounting(m
);
1285 log_unit_debug(u
, "Mount still present after %u attempts to unmount, giving up.", m
->n_retry_umount
);
1286 mount_enter_mounted(m
, f
);
1289 mount_enter_dead(m
, f
);
1291 } else if (m
->from_proc_self_mountinfo
)
1292 mount_enter_mounted(m
, f
);
1294 mount_enter_dead(m
, f
);
1298 assert_not_reached("Uh, control process died at wrong time.");
1301 /* Notify clients about changed exit status */
1302 unit_add_to_dbus_queue(u
);
1305 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
1306 Mount
*m
= MOUNT(userdata
);
1309 assert(m
->timer_event_source
== source
);
1313 case MOUNT_MOUNTING
:
1314 case MOUNT_MOUNTING_DONE
:
1315 log_unit_warning(UNIT(m
), "Mounting timed out. Stopping.");
1316 mount_enter_signal(m
, MOUNT_MOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1319 case MOUNT_REMOUNTING
:
1320 log_unit_warning(UNIT(m
), "Remounting timed out. Stopping.");
1321 m
->reload_result
= MOUNT_FAILURE_TIMEOUT
;
1322 mount_enter_mounted(m
, MOUNT_SUCCESS
);
1325 case MOUNT_UNMOUNTING
:
1326 log_unit_warning(UNIT(m
), "Unmounting timed out. Stopping.");
1327 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1330 case MOUNT_MOUNTING_SIGTERM
:
1331 if (m
->kill_context
.send_sigkill
) {
1332 log_unit_warning(UNIT(m
), "Mounting timed out. Killing.");
1333 mount_enter_signal(m
, MOUNT_MOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1335 log_unit_warning(UNIT(m
), "Mounting timed out. Skipping SIGKILL. Ignoring.");
1337 if (m
->from_proc_self_mountinfo
)
1338 mount_enter_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1340 mount_enter_dead(m
, MOUNT_FAILURE_TIMEOUT
);
1344 case MOUNT_REMOUNTING_SIGTERM
:
1345 if (m
->kill_context
.send_sigkill
) {
1346 log_unit_warning(UNIT(m
), "Remounting timed out. Killing.");
1347 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1349 log_unit_warning(UNIT(m
), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1351 if (m
->from_proc_self_mountinfo
)
1352 mount_enter_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1354 mount_enter_dead(m
, MOUNT_FAILURE_TIMEOUT
);
1358 case MOUNT_UNMOUNTING_SIGTERM
:
1359 if (m
->kill_context
.send_sigkill
) {
1360 log_unit_warning(UNIT(m
), "Unmounting timed out. Killing.");
1361 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1363 log_unit_warning(UNIT(m
), "Unmounting timed out. Skipping SIGKILL. Ignoring.");
1365 if (m
->from_proc_self_mountinfo
)
1366 mount_enter_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1368 mount_enter_dead(m
, MOUNT_FAILURE_TIMEOUT
);
1372 case MOUNT_MOUNTING_SIGKILL
:
1373 case MOUNT_REMOUNTING_SIGKILL
:
1374 case MOUNT_UNMOUNTING_SIGKILL
:
1375 log_unit_warning(UNIT(m
),"Mount process still around after SIGKILL. Ignoring.");
1377 if (m
->from_proc_self_mountinfo
)
1378 mount_enter_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1380 mount_enter_dead(m
, MOUNT_FAILURE_TIMEOUT
);
1384 assert_not_reached("Timeout at wrong time.");
1396 static int mount_setup_new_unit(
1400 const char *options
,
1402 MountSetupFlags
*flags
) {
1409 u
->source_path
= strdup("/proc/self/mountinfo");
1410 MOUNT(u
)->where
= strdup(where
);
1411 if (!u
->source_path
|| !MOUNT(u
)->where
)
1414 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1415 MOUNT(u
)->from_proc_self_mountinfo
= true;
1416 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1418 p
->what
= strdup(what
);
1419 p
->options
= strdup(options
);
1420 p
->fstype
= strdup(fstype
);
1421 if (!p
->what
|| !p
->options
|| !p
->fstype
)
1424 if (!mount_is_extrinsic(MOUNT(u
))) {
1428 target
= mount_is_network(p
) ? SPECIAL_REMOTE_FS_TARGET
: SPECIAL_LOCAL_FS_TARGET
;
1429 r
= unit_add_dependency_by_name(u
, UNIT_BEFORE
, target
, NULL
, true);
1433 r
= unit_add_dependency_by_name(u
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true);
1438 flags
->is_mounted
= true;
1439 flags
->just_mounted
= true;
1440 flags
->just_changed
= true;
1445 static int mount_setup_existing_unit(
1449 const char *options
,
1451 MountSetupFlags
*flags
) {
1454 bool load_extras
= false;
1460 if (!MOUNT(u
)->where
) {
1461 MOUNT(u
)->where
= strdup(where
);
1462 if (!MOUNT(u
)->where
)
1466 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1467 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1469 r1
= free_and_strdup(&p
->what
, what
);
1470 r2
= free_and_strdup(&p
->options
, options
);
1471 r3
= free_and_strdup(&p
->fstype
, fstype
);
1472 if (r1
< 0 || r2
< 0 || r3
< 0)
1475 flags
->just_changed
= r1
> 0 || r2
> 0 || r3
> 0;
1476 flags
->is_mounted
= true;
1477 flags
->just_mounted
= !MOUNT(u
)->from_proc_self_mountinfo
;
1479 MOUNT(u
)->from_proc_self_mountinfo
= true;
1481 if (!mount_is_extrinsic(MOUNT(u
)) && mount_is_network(p
)) {
1482 /* _netdev option may have shown up late, or on a
1483 * remount. Add remote-fs dependencies, even though
1484 * local-fs ones may already be there.
1486 * Note: due to a current limitation (we don't track
1487 * in the dependency "Set*" objects who created a
1488 * dependency), we can only add deps, never lose them,
1489 * until the next full daemon-reload. */
1490 unit_add_dependency_by_name(u
, UNIT_BEFORE
, SPECIAL_REMOTE_FS_TARGET
, NULL
, true);
1494 if (u
->load_state
== UNIT_NOT_FOUND
) {
1495 u
->load_state
= UNIT_LOADED
;
1498 /* Load in the extras later on, after we
1499 * finished initialization of the unit */
1501 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1503 flags
->just_changed
= true;
1507 return mount_add_extras(MOUNT(u
));
1512 static int mount_setup_unit(
1516 const char *options
,
1520 _cleanup_free_
char *e
= NULL
;
1521 MountSetupFlags flags
;
1531 /* Ignore API mount points. They should never be referenced in
1532 * dependencies ever. */
1533 if (mount_point_is_api(where
) || mount_point_ignore(where
))
1536 if (streq(fstype
, "autofs"))
1539 /* probably some kind of swap, ignore */
1540 if (!is_path(where
))
1543 r
= unit_name_from_path(where
, ".mount", &e
);
1547 u
= manager_get_unit(m
, e
);
1549 /* First time we see this mount point meaning that it's
1550 * not been initiated by a mount unit but rather by the
1551 * sysadmin having called mount(8) directly. */
1552 r
= unit_new_for_name(m
, sizeof(Mount
), e
, &u
);
1556 r
= mount_setup_new_unit(u
, what
, where
, options
, fstype
, &flags
);
1560 r
= mount_setup_existing_unit(u
, what
, where
, options
, fstype
, &flags
);
1566 MOUNT(u
)->is_mounted
= flags
.is_mounted
;
1567 MOUNT(u
)->just_mounted
= flags
.just_mounted
;
1568 MOUNT(u
)->just_changed
= flags
.just_changed
;
1571 if (flags
.just_changed
)
1572 unit_add_to_dbus_queue(u
);
1576 log_warning_errno(r
, "Failed to set up mount unit: %m");
1580 static int mount_load_proc_self_mountinfo(Manager
*m
, bool set_flags
) {
1581 _cleanup_(mnt_free_tablep
) struct libmnt_table
*t
= NULL
;
1582 _cleanup_(mnt_free_iterp
) struct libmnt_iter
*i
= NULL
;
1587 t
= mnt_new_table();
1591 i
= mnt_new_iter(MNT_ITER_FORWARD
);
1595 r
= mnt_table_parse_mtab(t
, NULL
);
1597 return log_error_errno(r
, "Failed to parse /proc/self/mountinfo: %m");
1601 const char *device
, *path
, *options
, *fstype
;
1602 _cleanup_free_
char *d
= NULL
, *p
= NULL
;
1603 struct libmnt_fs
*fs
;
1606 k
= mnt_table_next_fs(t
, i
, &fs
);
1610 return log_error_errno(k
, "Failed to get next entry from /proc/self/mountinfo: %m");
1612 device
= mnt_fs_get_source(fs
);
1613 path
= mnt_fs_get_target(fs
);
1614 options
= mnt_fs_get_options(fs
);
1615 fstype
= mnt_fs_get_fstype(fs
);
1617 if (!device
|| !path
)
1620 if (cunescape(device
, UNESCAPE_RELAX
, &d
) < 0)
1623 if (cunescape(path
, UNESCAPE_RELAX
, &p
) < 0)
1626 (void) device_found_node(m
, d
, true, DEVICE_FOUND_MOUNT
, set_flags
);
1628 k
= mount_setup_unit(m
, d
, p
, options
, fstype
, set_flags
);
1629 if (r
== 0 && k
< 0)
1636 static void mount_shutdown(Manager
*m
) {
1640 m
->mount_event_source
= sd_event_source_unref(m
->mount_event_source
);
1642 mnt_unref_monitor(m
->mount_monitor
);
1643 m
->mount_monitor
= NULL
;
1646 static int mount_get_timeout(Unit
*u
, usec_t
*timeout
) {
1647 Mount
*m
= MOUNT(u
);
1651 if (!m
->timer_event_source
)
1654 r
= sd_event_source_get_time(m
->timer_event_source
, &t
);
1657 if (t
== USEC_INFINITY
)
1664 static int synthesize_root_mount(Manager
*m
) {
1670 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1671 * unconditionally synthesize it here and mark it as perpetual. */
1673 u
= manager_get_unit(m
, SPECIAL_ROOT_MOUNT
);
1675 r
= unit_new_for_name(m
, sizeof(Mount
), SPECIAL_ROOT_MOUNT
, &u
);
1677 return log_error_errno(r
, "Failed to allocate the special " SPECIAL_ROOT_MOUNT
" unit: %m");
1680 u
->perpetual
= true;
1681 MOUNT(u
)->deserialized_state
= MOUNT_MOUNTED
;
1683 unit_add_to_load_queue(u
);
1684 unit_add_to_dbus_queue(u
);
1689 static bool mount_is_mounted(Mount
*m
) {
1692 return UNIT(m
)->perpetual
|| m
->is_mounted
;
1695 static void mount_enumerate(Manager
*m
) {
1700 r
= synthesize_root_mount(m
);
1706 if (!m
->mount_monitor
) {
1709 m
->mount_monitor
= mnt_new_monitor();
1710 if (!m
->mount_monitor
) {
1715 r
= mnt_monitor_enable_kernel(m
->mount_monitor
, 1);
1717 log_error_errno(r
, "Failed to enable watching of kernel mount events: %m");
1721 r
= mnt_monitor_enable_userspace(m
->mount_monitor
, 1, NULL
);
1723 log_error_errno(r
, "Failed to enable watching of userspace mount events: %m");
1727 /* mnt_unref_monitor() will close the fd */
1728 fd
= r
= mnt_monitor_get_fd(m
->mount_monitor
);
1730 log_error_errno(r
, "Failed to acquire watch file descriptor: %m");
1734 r
= sd_event_add_io(m
->event
, &m
->mount_event_source
, fd
, EPOLLIN
, mount_dispatch_io
, m
);
1736 log_error_errno(r
, "Failed to watch mount file descriptor: %m");
1740 r
= sd_event_source_set_priority(m
->mount_event_source
, -10);
1742 log_error_errno(r
, "Failed to adjust mount watch priority: %m");
1746 (void) sd_event_source_set_description(m
->mount_event_source
, "mount-monitor-dispatch");
1749 r
= mount_load_proc_self_mountinfo(m
, false);
1759 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
1760 _cleanup_set_free_ Set
*around
= NULL
, *gone
= NULL
;
1761 Manager
*m
= userdata
;
1768 assert(revents
& EPOLLIN
);
1770 if (fd
== mnt_monitor_get_fd(m
->mount_monitor
)) {
1771 bool rescan
= false;
1773 /* Drain all events and verify that the event is valid.
1775 * Note that libmount also monitors /run/mount mkdir if the
1776 * directory does not exist yet. The mkdir may generate event
1777 * which is irrelevant for us.
1779 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1781 r
= mnt_monitor_next_change(m
->mount_monitor
, NULL
, NULL
);
1785 return log_error_errno(r
, "Failed to drain libmount events");
1788 log_debug("libmount event [rescan: %s]", yes_no(rescan
));
1793 r
= mount_load_proc_self_mountinfo(m
, true);
1795 /* Reset flags, just in case, for later calls */
1796 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1797 Mount
*mount
= MOUNT(u
);
1799 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1805 manager_dispatch_load_queue(m
);
1807 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1808 Mount
*mount
= MOUNT(u
);
1810 if (!mount_is_mounted(mount
)) {
1812 /* A mount point is not around right now. It
1813 * might be gone, or might never have
1816 if (mount
->from_proc_self_mountinfo
&&
1817 mount
->parameters_proc_self_mountinfo
.what
) {
1819 /* Remember that this device might just have disappeared */
1820 if (set_ensure_allocated(&gone
, &string_hash_ops
) < 0 ||
1821 set_put(gone
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1822 log_oom(); /* we don't care too much about OOM here... */
1825 mount
->from_proc_self_mountinfo
= false;
1827 switch (mount
->state
) {
1830 /* This has just been unmounted by
1831 * somebody else, follow the state
1833 mount
->result
= MOUNT_SUCCESS
; /* make sure we forget any earlier umount failures */
1834 mount_enter_dead(mount
, MOUNT_SUCCESS
);
1841 } else if (mount
->just_mounted
|| mount
->just_changed
) {
1843 /* A mount point was added or changed */
1845 switch (mount
->state
) {
1850 /* This has just been mounted by somebody else, follow the state change, but let's
1851 * generate a new invocation ID for this implicitly and automatically. */
1852 (void) unit_acquire_invocation_id(UNIT(mount
));
1853 mount_enter_mounted(mount
, MOUNT_SUCCESS
);
1856 case MOUNT_MOUNTING
:
1857 mount_set_state(mount
, MOUNT_MOUNTING_DONE
);
1861 /* Nothing really changed, but let's
1862 * issue an notification call
1863 * nonetheless, in case somebody is
1864 * waiting for this. (e.g. file system
1865 * ro/rw remounts.) */
1866 mount_set_state(mount
, mount
->state
);
1871 if (mount_is_mounted(mount
) &&
1872 mount
->from_proc_self_mountinfo
&&
1873 mount
->parameters_proc_self_mountinfo
.what
) {
1875 if (set_ensure_allocated(&around
, &string_hash_ops
) < 0 ||
1876 set_put(around
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1880 /* Reset the flags for later calls */
1881 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1884 SET_FOREACH(what
, gone
, i
) {
1885 if (set_contains(around
, what
))
1888 /* Let the device units know that the device is no longer mounted */
1889 (void) device_found_node(m
, what
, false, DEVICE_FOUND_MOUNT
, true);
1895 static void mount_reset_failed(Unit
*u
) {
1896 Mount
*m
= MOUNT(u
);
1900 if (m
->state
== MOUNT_FAILED
)
1901 mount_set_state(m
, MOUNT_DEAD
);
1903 m
->result
= MOUNT_SUCCESS
;
1904 m
->reload_result
= MOUNT_SUCCESS
;
1907 static int mount_kill(Unit
*u
, KillWho who
, int signo
, sd_bus_error
*error
) {
1908 return unit_kill_common(u
, who
, signo
, -1, MOUNT(u
)->control_pid
, error
);
1911 static int mount_control_pid(Unit
*u
) {
1912 Mount
*m
= MOUNT(u
);
1916 return m
->control_pid
;
1919 static const char* const mount_exec_command_table
[_MOUNT_EXEC_COMMAND_MAX
] = {
1920 [MOUNT_EXEC_MOUNT
] = "ExecMount",
1921 [MOUNT_EXEC_UNMOUNT
] = "ExecUnmount",
1922 [MOUNT_EXEC_REMOUNT
] = "ExecRemount",
1925 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command
, MountExecCommand
);
1927 static const char* const mount_result_table
[_MOUNT_RESULT_MAX
] = {
1928 [MOUNT_SUCCESS
] = "success",
1929 [MOUNT_FAILURE_RESOURCES
] = "resources",
1930 [MOUNT_FAILURE_TIMEOUT
] = "timeout",
1931 [MOUNT_FAILURE_EXIT_CODE
] = "exit-code",
1932 [MOUNT_FAILURE_SIGNAL
] = "signal",
1933 [MOUNT_FAILURE_CORE_DUMP
] = "core-dump",
1934 [MOUNT_FAILURE_START_LIMIT_HIT
] = "start-limit-hit",
1937 DEFINE_STRING_TABLE_LOOKUP(mount_result
, MountResult
);
1939 const UnitVTable mount_vtable
= {
1940 .object_size
= sizeof(Mount
),
1941 .exec_context_offset
= offsetof(Mount
, exec_context
),
1942 .cgroup_context_offset
= offsetof(Mount
, cgroup_context
),
1943 .kill_context_offset
= offsetof(Mount
, kill_context
),
1944 .exec_runtime_offset
= offsetof(Mount
, exec_runtime
),
1945 .dynamic_creds_offset
= offsetof(Mount
, dynamic_creds
),
1951 .private_section
= "Mount",
1957 .coldplug
= mount_coldplug
,
1961 .start
= mount_start
,
1963 .reload
= mount_reload
,
1967 .serialize
= mount_serialize
,
1968 .deserialize_item
= mount_deserialize_item
,
1970 .active_state
= mount_active_state
,
1971 .sub_state_to_string
= mount_sub_state_to_string
,
1973 .check_gc
= mount_check_gc
,
1975 .sigchld_event
= mount_sigchld_event
,
1977 .reset_failed
= mount_reset_failed
,
1979 .control_pid
= mount_control_pid
,
1981 .bus_vtable
= bus_mount_vtable
,
1982 .bus_set_property
= bus_mount_set_property
,
1983 .bus_commit_properties
= bus_mount_commit_properties
,
1985 .get_timeout
= mount_get_timeout
,
1987 .can_transient
= true,
1989 .enumerate
= mount_enumerate
,
1990 .shutdown
= mount_shutdown
,
1992 .status_message_formats
= {
1993 .starting_stopping
= {
1994 [0] = "Mounting %s...",
1995 [1] = "Unmounting %s...",
1997 .finished_start_job
= {
1998 [JOB_DONE
] = "Mounted %s.",
1999 [JOB_FAILED
] = "Failed to mount %s.",
2000 [JOB_TIMEOUT
] = "Timed out mounting %s.",
2002 .finished_stop_job
= {
2003 [JOB_DONE
] = "Unmounted %s.",
2004 [JOB_FAILED
] = "Failed unmounting %s.",
2005 [JOB_TIMEOUT
] = "Timed out unmounting %s.",