1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2010 Lennart Poettering
7 systemd is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or
10 (at your option) any later version.
12 systemd is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include <sys/epoll.h>
26 #include "sd-messages.h"
28 #include "alloc-util.h"
29 #include "dbus-mount.h"
31 #include "exit-status.h"
32 #include "format-util.h"
33 #include "fstab-util.h"
37 #include "mount-setup.h"
38 #include "mount-util.h"
40 #include "parse-util.h"
41 #include "path-util.h"
42 #include "process-util.h"
44 #include "string-table.h"
45 #include "string-util.h"
47 #include "unit-name.h"
50 #define RETRY_UMOUNT_MAX 32
52 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table
*, mnt_free_table
);
53 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter
*, mnt_free_iter
);
55 static const UnitActiveState state_translation_table
[_MOUNT_STATE_MAX
] = {
56 [MOUNT_DEAD
] = UNIT_INACTIVE
,
57 [MOUNT_MOUNTING
] = UNIT_ACTIVATING
,
58 [MOUNT_MOUNTING_DONE
] = UNIT_ACTIVE
,
59 [MOUNT_MOUNTED
] = UNIT_ACTIVE
,
60 [MOUNT_REMOUNTING
] = UNIT_RELOADING
,
61 [MOUNT_UNMOUNTING
] = UNIT_DEACTIVATING
,
62 [MOUNT_REMOUNTING_SIGTERM
] = UNIT_RELOADING
,
63 [MOUNT_REMOUNTING_SIGKILL
] = UNIT_RELOADING
,
64 [MOUNT_UNMOUNTING_SIGTERM
] = UNIT_DEACTIVATING
,
65 [MOUNT_UNMOUNTING_SIGKILL
] = UNIT_DEACTIVATING
,
66 [MOUNT_FAILED
] = UNIT_FAILED
69 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
);
70 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
);
72 static bool MOUNT_STATE_WITH_PROCESS(MountState state
) {
77 MOUNT_REMOUNTING_SIGTERM
,
78 MOUNT_REMOUNTING_SIGKILL
,
80 MOUNT_UNMOUNTING_SIGTERM
,
81 MOUNT_UNMOUNTING_SIGKILL
);
84 static bool mount_needs_network(const char *options
, const char *fstype
) {
85 if (fstab_test_option(options
, "_netdev\0"))
88 if (fstype
&& fstype_is_network(fstype
))
94 static bool mount_is_network(const MountParameters
*p
) {
97 return mount_needs_network(p
->options
, p
->fstype
);
100 static bool mount_is_loop(const MountParameters
*p
) {
103 if (fstab_test_option(p
->options
, "loop\0"))
109 static bool mount_is_bind(const MountParameters
*p
) {
112 if (fstab_test_option(p
->options
, "bind\0" "rbind\0"))
115 if (p
->fstype
&& STR_IN_SET(p
->fstype
, "bind", "rbind"))
121 static bool mount_is_auto(const MountParameters
*p
) {
124 return !fstab_test_option(p
->options
, "noauto\0");
127 static bool mount_is_automount(const MountParameters
*p
) {
130 return fstab_test_option(p
->options
,
131 "comment=systemd.automount\0"
132 "x-systemd.automount\0");
135 static bool mount_is_bound_to_device(const Mount
*m
) {
136 const MountParameters
*p
;
138 if (m
->from_fragment
)
141 p
= &m
->parameters_proc_self_mountinfo
;
142 return fstab_test_option(p
->options
, "x-systemd.device-bound\0");
145 static bool needs_quota(const MountParameters
*p
) {
148 /* Quotas are not enabled on network filesystems,
149 * but we want them, for example, on storage connected via iscsi */
150 if (p
->fstype
&& fstype_is_network(p
->fstype
))
153 if (mount_is_bind(p
))
156 return fstab_test_option(p
->options
,
157 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
160 static void mount_init(Unit
*u
) {
164 assert(u
->load_state
== UNIT_STUB
);
166 m
->timeout_usec
= u
->manager
->default_timeout_start_usec
;
168 m
->exec_context
.std_output
= u
->manager
->default_std_output
;
169 m
->exec_context
.std_error
= u
->manager
->default_std_error
;
171 m
->directory_mode
= 0755;
173 /* We need to make sure that /usr/bin/mount is always called
174 * in the same process group as us, so that the autofs kernel
175 * side doesn't send us another mount request while we are
176 * already trying to comply its last one. */
177 m
->exec_context
.same_pgrp
= true;
179 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
181 u
->ignore_on_isolate
= true;
184 static int mount_arm_timer(Mount
*m
, usec_t usec
) {
189 if (m
->timer_event_source
) {
190 r
= sd_event_source_set_time(m
->timer_event_source
, usec
);
194 return sd_event_source_set_enabled(m
->timer_event_source
, SD_EVENT_ONESHOT
);
197 if (usec
== USEC_INFINITY
)
200 r
= sd_event_add_time(
201 UNIT(m
)->manager
->event
,
202 &m
->timer_event_source
,
205 mount_dispatch_timer
, m
);
209 (void) sd_event_source_set_description(m
->timer_event_source
, "mount-timer");
214 static void mount_unwatch_control_pid(Mount
*m
) {
217 if (m
->control_pid
<= 0)
220 unit_unwatch_pid(UNIT(m
), m
->control_pid
);
224 static void mount_parameters_done(MountParameters
*p
) {
231 p
->what
= p
->options
= p
->fstype
= NULL
;
234 static void mount_done(Unit
*u
) {
239 m
->where
= mfree(m
->where
);
241 mount_parameters_done(&m
->parameters_proc_self_mountinfo
);
242 mount_parameters_done(&m
->parameters_fragment
);
244 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
);
245 exec_command_done_array(m
->exec_command
, _MOUNT_EXEC_COMMAND_MAX
);
246 m
->control_command
= NULL
;
248 dynamic_creds_unref(&m
->dynamic_creds
);
250 mount_unwatch_control_pid(m
);
252 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
255 _pure_
static MountParameters
* get_mount_parameters_fragment(Mount
*m
) {
258 if (m
->from_fragment
)
259 return &m
->parameters_fragment
;
264 _pure_
static MountParameters
* get_mount_parameters(Mount
*m
) {
267 if (m
->from_proc_self_mountinfo
)
268 return &m
->parameters_proc_self_mountinfo
;
270 return get_mount_parameters_fragment(m
);
273 static int mount_add_mount_dependencies(Mount
*m
) {
282 if (!path_equal(m
->where
, "/")) {
283 _cleanup_free_
char *parent
= NULL
;
285 /* Adds in links to other mount points that might lie further up in the hierarchy */
287 parent
= dirname_malloc(m
->where
);
291 r
= unit_require_mounts_for(UNIT(m
), parent
, UNIT_DEPENDENCY_IMPLICIT
);
296 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
297 * or a loop mount) to be available. */
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
, UNIT_DEPENDENCY_FILE
);
308 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
309 s
= manager_get_units_requiring_mounts_for(UNIT(m
)->manager
, m
->where
);
310 SET_FOREACH(other
, s
, i
) {
312 if (other
->load_state
!= UNIT_LOADED
)
315 if (other
== UNIT(m
))
318 r
= unit_add_dependency(other
, UNIT_AFTER
, UNIT(m
), true, UNIT_DEPENDENCY_PATH
);
322 if (UNIT(m
)->fragment_path
) {
323 /* If we have fragment configuration, then make this dependency required */
324 r
= unit_add_dependency(other
, UNIT_REQUIRES
, UNIT(m
), true, UNIT_DEPENDENCY_PATH
);
333 static int mount_add_device_dependencies(Mount
*m
) {
334 bool device_wants_mount
= false;
335 UnitDependencyMask mask
;
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 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
;
376 r
= unit_add_node_dependency(UNIT(m
), p
->what
, device_wants_mount
, dep
, mask
);
383 static int mount_add_quota_dependencies(Mount
*m
) {
384 UnitDependencyMask mask
;
390 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
393 p
= get_mount_parameters_fragment(m
);
400 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
;
402 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTACHECK_SERVICE
, NULL
, true, mask
);
406 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTAON_SERVICE
, NULL
, true, mask
);
413 static bool mount_is_extrinsic(Mount
*m
) {
417 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
418 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
419 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
421 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
)) /* We only automatically manage mounts if we are in system mode */
424 if (PATH_IN_SET(m
->where
, /* Don't bother with the OS data itself */
429 if (PATH_STARTSWITH_SET(m
->where
,
430 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
431 "/proc", /* All of this is API VFS */
432 "/sys", /* … dito … */
433 "/dev")) /* … dito … */
436 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
437 p
= get_mount_parameters(m
);
438 if (p
&& fstab_test_option(p
->options
, "x-initrd.mount\0") && !in_initrd())
444 static int mount_add_default_dependencies(Mount
*m
) {
445 UnitDependencyMask mask
;
452 if (!UNIT(m
)->default_dependencies
)
455 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
456 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
457 * file systems, it's also going to be virtual, and hence not worth the effort. */
458 if (mount_is_extrinsic(m
))
461 p
= get_mount_parameters(m
);
465 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_DEFAULT
;
467 if (mount_is_network(p
)) {
468 /* We order ourselves after network.target. This is
469 * primarily useful at shutdown: services that take
470 * down the network should order themselves before
471 * network.target, so that they are shut down only
472 * after this mount unit is stopped. */
474 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_NETWORK_TARGET
, NULL
, true, mask
);
478 /* We pull in network-online.target, and order
479 * ourselves after it. This is useful at start-up to
480 * actively pull in tools that want to be started
481 * before we start mounting network file systems, and
482 * whose purpose it is to delay this until the network
485 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_WANTS
, UNIT_AFTER
, SPECIAL_NETWORK_ONLINE_TARGET
, NULL
, true, mask
);
489 after
= SPECIAL_REMOTE_FS_PRE_TARGET
;
491 after
= SPECIAL_LOCAL_FS_PRE_TARGET
;
493 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, after
, NULL
, true, mask
);
497 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true, mask
);
501 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
502 if (streq_ptr(p
->fstype
, "tmpfs")) {
503 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_SWAP_TARGET
, NULL
, true, mask
);
511 static int mount_verify(Mount
*m
) {
512 _cleanup_free_
char *e
= NULL
;
518 if (UNIT(m
)->load_state
!= UNIT_LOADED
)
521 if (!m
->from_fragment
&& !m
->from_proc_self_mountinfo
&& !UNIT(m
)->perpetual
)
524 r
= unit_name_from_path(m
->where
, ".mount", &e
);
526 return log_unit_error_errno(UNIT(m
), r
, "Failed to generate unit name from mount path: %m");
528 if (!unit_has_name(UNIT(m
), e
)) {
529 log_unit_error(UNIT(m
), "Where= setting doesn't match unit name. Refusing.");
533 if (mount_point_is_api(m
->where
) || mount_point_ignore(m
->where
)) {
534 log_unit_error(UNIT(m
), "Cannot create mount unit for API file system %s. Refusing.", m
->where
);
538 p
= get_mount_parameters_fragment(m
);
540 log_unit_error(UNIT(m
), "What= setting is missing. Refusing.");
544 if (m
->exec_context
.pam_name
&& m
->kill_context
.kill_mode
!= KILL_CONTROL_GROUP
) {
545 log_unit_error(UNIT(m
), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
552 static int mount_add_extras(Mount
*m
) {
558 if (u
->fragment_path
)
559 m
->from_fragment
= true;
562 r
= unit_name_to_path(u
->id
, &m
->where
);
567 path_kill_slashes(m
->where
);
569 if (!u
->description
) {
570 r
= unit_set_description(u
, m
->where
);
575 r
= mount_add_device_dependencies(m
);
579 r
= mount_add_mount_dependencies(m
);
583 r
= mount_add_quota_dependencies(m
);
587 r
= unit_patch_contexts(u
);
591 r
= unit_add_exec_dependencies(u
, &m
->exec_context
);
595 r
= unit_set_default_slice(u
);
599 r
= mount_add_default_dependencies(m
);
606 static int mount_load_root_mount(Unit
*u
) {
609 if (!unit_has_name(u
, SPECIAL_ROOT_MOUNT
))
613 u
->default_dependencies
= false;
615 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
616 MOUNT(u
)->exec_context
.std_output
= EXEC_OUTPUT_NULL
;
617 MOUNT(u
)->exec_context
.std_input
= EXEC_INPUT_NULL
;
620 u
->description
= strdup("Root Mount");
625 static int mount_load(Unit
*u
) {
630 assert(u
->load_state
== UNIT_STUB
);
632 r
= mount_load_root_mount(u
);
636 if (m
->from_proc_self_mountinfo
|| u
->perpetual
)
637 r
= unit_load_fragment_and_dropin_optional(u
);
639 r
= unit_load_fragment_and_dropin(u
);
643 /* This is a new unit? Then let's add in some extras */
644 if (u
->load_state
== UNIT_LOADED
) {
645 r
= mount_add_extras(m
);
650 return mount_verify(m
);
653 static void mount_set_state(Mount
*m
, MountState state
) {
654 MountState old_state
;
657 old_state
= m
->state
;
660 if (!MOUNT_STATE_WITH_PROCESS(state
)) {
661 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
662 mount_unwatch_control_pid(m
);
663 m
->control_command
= NULL
;
664 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
667 if (state
!= old_state
)
668 log_unit_debug(UNIT(m
), "Changed %s -> %s", mount_state_to_string(old_state
), mount_state_to_string(state
));
670 unit_notify(UNIT(m
), state_translation_table
[old_state
], state_translation_table
[state
], m
->reload_result
== MOUNT_SUCCESS
);
673 static int mount_coldplug(Unit
*u
) {
675 MountState new_state
= MOUNT_DEAD
;
679 assert(m
->state
== MOUNT_DEAD
);
681 if (m
->deserialized_state
!= m
->state
)
682 new_state
= m
->deserialized_state
;
683 else if (m
->from_proc_self_mountinfo
)
684 new_state
= MOUNT_MOUNTED
;
686 if (new_state
== m
->state
)
689 if (m
->control_pid
> 0 &&
690 pid_is_unwaited(m
->control_pid
) &&
691 MOUNT_STATE_WITH_PROCESS(new_state
)) {
693 r
= unit_watch_pid(UNIT(m
), m
->control_pid
);
697 r
= mount_arm_timer(m
, usec_add(u
->state_change_timestamp
.monotonic
, m
->timeout_usec
));
702 if (!IN_SET(new_state
, MOUNT_DEAD
, MOUNT_FAILED
))
703 (void) unit_setup_dynamic_creds(u
);
705 mount_set_state(m
, new_state
);
709 static void mount_dump(Unit
*u
, FILE *f
, const char *prefix
) {
716 p
= get_mount_parameters(m
);
719 "%sMount State: %s\n"
723 "%sFile System Type: %s\n"
725 "%sFrom /proc/self/mountinfo: %s\n"
726 "%sFrom fragment: %s\n"
728 "%sDirectoryMode: %04o\n"
729 "%sSloppyOptions: %s\n"
730 "%sLazyUnmount: %s\n"
731 "%sForceUnmount: %s\n",
732 prefix
, mount_state_to_string(m
->state
),
733 prefix
, mount_result_to_string(m
->result
),
735 prefix
, p
? strna(p
->what
) : "n/a",
736 prefix
, p
? strna(p
->fstype
) : "n/a",
737 prefix
, p
? strna(p
->options
) : "n/a",
738 prefix
, yes_no(m
->from_proc_self_mountinfo
),
739 prefix
, yes_no(m
->from_fragment
),
740 prefix
, yes_no(mount_is_extrinsic(m
)),
741 prefix
, m
->directory_mode
,
742 prefix
, yes_no(m
->sloppy_options
),
743 prefix
, yes_no(m
->lazy_unmount
),
744 prefix
, yes_no(m
->force_unmount
));
746 if (m
->control_pid
> 0)
748 "%sControl PID: "PID_FMT
"\n",
749 prefix
, m
->control_pid
);
751 exec_context_dump(&m
->exec_context
, f
, prefix
);
752 kill_context_dump(&m
->kill_context
, f
, prefix
);
753 cgroup_context_dump(&m
->cgroup_context
, f
, prefix
);
756 static int mount_spawn(Mount
*m
, ExecCommand
*c
, pid_t
*_pid
) {
758 ExecParameters exec_params
= {
759 .flags
= EXEC_APPLY_SANDBOXING
|EXEC_APPLY_CHROOT
|EXEC_APPLY_TTY_STDIN
,
771 r
= unit_prepare_exec(UNIT(m
));
775 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
779 manager_set_exec_params(UNIT(m
)->manager
, &exec_params
);
780 unit_set_exec_params(UNIT(m
), &exec_params
);
782 r
= exec_spawn(UNIT(m
),
792 r
= unit_watch_pid(UNIT(m
), pid
);
794 /* FIXME: we need to do something here */
802 static void mount_enter_dead(Mount
*m
, MountResult f
) {
805 if (m
->result
== MOUNT_SUCCESS
)
808 if (m
->result
!= MOUNT_SUCCESS
)
809 log_unit_warning(UNIT(m
), "Failed with result '%s'.", mount_result_to_string(m
->result
));
811 mount_set_state(m
, m
->result
!= MOUNT_SUCCESS
? MOUNT_FAILED
: MOUNT_DEAD
);
813 exec_runtime_destroy(m
->exec_runtime
);
814 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
);
816 exec_context_destroy_runtime_directory(&m
->exec_context
, UNIT(m
)->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
818 unit_unref_uid_gid(UNIT(m
), true);
820 dynamic_creds_destroy(&m
->dynamic_creds
);
823 static void mount_enter_mounted(Mount
*m
, MountResult f
) {
826 if (m
->result
== MOUNT_SUCCESS
)
829 mount_set_state(m
, MOUNT_MOUNTED
);
832 static void mount_enter_dead_or_mounted(Mount
*m
, MountResult f
) {
835 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
836 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
837 * ultimately we just mirror the kernel's internal state on this. */
839 if (m
->from_proc_self_mountinfo
)
840 mount_enter_mounted(m
, f
);
842 mount_enter_dead(m
, f
);
845 static int state_to_kill_operation(MountState state
) {
848 case MOUNT_REMOUNTING_SIGTERM
:
849 case MOUNT_UNMOUNTING_SIGTERM
:
850 return KILL_TERMINATE
;
852 case MOUNT_REMOUNTING_SIGKILL
:
853 case MOUNT_UNMOUNTING_SIGKILL
:
857 return _KILL_OPERATION_INVALID
;
861 static void mount_enter_signal(Mount
*m
, MountState state
, MountResult f
) {
866 if (m
->result
== MOUNT_SUCCESS
)
869 r
= unit_kill_context(
872 state_to_kill_operation(state
),
880 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
884 mount_set_state(m
, state
);
885 } else if (state
== MOUNT_REMOUNTING_SIGTERM
&& m
->kill_context
.send_sigkill
)
886 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
887 else if (IN_SET(state
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_REMOUNTING_SIGKILL
))
888 mount_enter_mounted(m
, MOUNT_SUCCESS
);
889 else if (state
== MOUNT_UNMOUNTING_SIGTERM
&& m
->kill_context
.send_sigkill
)
890 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
892 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
897 log_unit_warning_errno(UNIT(m
), r
, "Failed to kill processes: %m");
898 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
901 static void mount_enter_unmounting(Mount
*m
) {
906 /* Start counting our attempts */
907 if (!IN_SET(m
->state
,
909 MOUNT_UNMOUNTING_SIGTERM
,
910 MOUNT_UNMOUNTING_SIGKILL
))
911 m
->n_retry_umount
= 0;
913 m
->control_command_id
= MOUNT_EXEC_UNMOUNT
;
914 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_UNMOUNT
;
916 r
= exec_command_set(m
->control_command
, UMOUNT_PATH
, m
->where
, "-c", NULL
);
917 if (r
>= 0 && m
->lazy_unmount
)
918 r
= exec_command_append(m
->control_command
, "-l", NULL
);
919 if (r
>= 0 && m
->force_unmount
)
920 r
= exec_command_append(m
->control_command
, "-f", NULL
);
924 mount_unwatch_control_pid(m
);
926 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
930 mount_set_state(m
, MOUNT_UNMOUNTING
);
935 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'umount' task: %m");
936 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
939 static void mount_enter_mounting(Mount
*m
) {
945 r
= unit_fail_if_symlink(UNIT(m
), m
->where
);
949 (void) mkdir_p_label(m
->where
, m
->directory_mode
);
951 unit_warn_if_dir_nonempty(UNIT(m
), m
->where
);
953 unit_warn_leftover_processes(UNIT(m
));
955 m
->control_command_id
= MOUNT_EXEC_MOUNT
;
956 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_MOUNT
;
958 /* Create the source directory for bind-mounts if needed */
959 p
= get_mount_parameters_fragment(m
);
960 if (p
&& mount_is_bind(p
))
961 (void) mkdir_p_label(p
->what
, m
->directory_mode
);
964 _cleanup_free_
char *opts
= NULL
;
966 r
= fstab_filter_options(p
->options
, "nofail\0" "noauto\0" "auto\0", NULL
, NULL
, &opts
);
970 r
= exec_command_set(m
->control_command
, MOUNT_PATH
, p
->what
, m
->where
, NULL
);
971 if (r
>= 0 && m
->sloppy_options
)
972 r
= exec_command_append(m
->control_command
, "-s", NULL
);
973 if (r
>= 0 && p
->fstype
)
974 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
975 if (r
>= 0 && !isempty(opts
))
976 r
= exec_command_append(m
->control_command
, "-o", opts
, NULL
);
982 mount_unwatch_control_pid(m
);
984 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
988 mount_set_state(m
, MOUNT_MOUNTING
);
993 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'mount' task: %m");
994 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
997 static void mount_set_reload_result(Mount
*m
, MountResult result
) {
1000 /* Only store the first error we encounter */
1001 if (m
->reload_result
!= MOUNT_SUCCESS
)
1004 m
->reload_result
= result
;
1007 static void mount_enter_remounting(Mount
*m
) {
1013 /* Reset reload result when we are about to start a new remount operation */
1014 m
->reload_result
= MOUNT_SUCCESS
;
1016 m
->control_command_id
= MOUNT_EXEC_REMOUNT
;
1017 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_REMOUNT
;
1019 p
= get_mount_parameters_fragment(m
);
1024 o
= strjoina("remount,", p
->options
);
1028 r
= exec_command_set(m
->control_command
, MOUNT_PATH
,
1031 if (r
>= 0 && m
->sloppy_options
)
1032 r
= exec_command_append(m
->control_command
, "-s", NULL
);
1033 if (r
>= 0 && p
->fstype
)
1034 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
1040 mount_unwatch_control_pid(m
);
1042 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
1046 mount_set_state(m
, MOUNT_REMOUNTING
);
1051 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'remount' task: %m");
1052 mount_set_reload_result(m
, MOUNT_FAILURE_RESOURCES
);
1053 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1056 static int mount_start(Unit
*u
) {
1057 Mount
*m
= MOUNT(u
);
1062 /* We cannot fulfill this request right now, try again later
1064 if (IN_SET(m
->state
,
1066 MOUNT_UNMOUNTING_SIGTERM
,
1067 MOUNT_UNMOUNTING_SIGKILL
))
1070 /* Already on it! */
1071 if (m
->state
== MOUNT_MOUNTING
)
1074 assert(IN_SET(m
->state
, MOUNT_DEAD
, MOUNT_FAILED
));
1076 r
= unit_start_limit_test(u
);
1078 mount_enter_dead(m
, MOUNT_FAILURE_START_LIMIT_HIT
);
1082 r
= unit_acquire_invocation_id(u
);
1086 m
->result
= MOUNT_SUCCESS
;
1087 m
->reload_result
= MOUNT_SUCCESS
;
1089 u
->reset_accounting
= true;
1091 mount_enter_mounting(m
);
1095 static int mount_stop(Unit
*u
) {
1096 Mount
*m
= MOUNT(u
);
1102 case MOUNT_UNMOUNTING
:
1103 case MOUNT_UNMOUNTING_SIGKILL
:
1104 case MOUNT_UNMOUNTING_SIGTERM
:
1108 case MOUNT_MOUNTING
:
1109 case MOUNT_MOUNTING_DONE
:
1110 case MOUNT_REMOUNTING
:
1111 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1112 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_SUCCESS
);
1115 case MOUNT_REMOUNTING_SIGTERM
:
1116 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1117 mount_set_state(m
, MOUNT_UNMOUNTING_SIGTERM
);
1120 case MOUNT_REMOUNTING_SIGKILL
:
1122 mount_set_state(m
, MOUNT_UNMOUNTING_SIGKILL
);
1126 mount_enter_unmounting(m
);
1130 assert_not_reached("Unexpected state.");
1134 static int mount_reload(Unit
*u
) {
1135 Mount
*m
= MOUNT(u
);
1139 if (m
->state
== MOUNT_MOUNTING_DONE
) /* not yet ready to reload, try again */
1142 assert(m
->state
== MOUNT_MOUNTED
);
1144 mount_enter_remounting(m
);
1149 static int mount_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
1150 Mount
*m
= MOUNT(u
);
1156 unit_serialize_item(u
, f
, "state", mount_state_to_string(m
->state
));
1157 unit_serialize_item(u
, f
, "result", mount_result_to_string(m
->result
));
1158 unit_serialize_item(u
, f
, "reload-result", mount_result_to_string(m
->reload_result
));
1160 if (m
->control_pid
> 0)
1161 unit_serialize_item_format(u
, f
, "control-pid", PID_FMT
, m
->control_pid
);
1163 if (m
->control_command_id
>= 0)
1164 unit_serialize_item(u
, f
, "control-command", mount_exec_command_to_string(m
->control_command_id
));
1169 static int mount_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
1170 Mount
*m
= MOUNT(u
);
1177 if (streq(key
, "state")) {
1180 if ((state
= mount_state_from_string(value
)) < 0)
1181 log_unit_debug(u
, "Failed to parse state value: %s", value
);
1183 m
->deserialized_state
= state
;
1184 } else if (streq(key
, "result")) {
1187 f
= mount_result_from_string(value
);
1189 log_unit_debug(u
, "Failed to parse result value: %s", value
);
1190 else if (f
!= MOUNT_SUCCESS
)
1193 } else if (streq(key
, "reload-result")) {
1196 f
= mount_result_from_string(value
);
1198 log_unit_debug(u
, "Failed to parse reload result value: %s", value
);
1199 else if (f
!= MOUNT_SUCCESS
)
1200 m
->reload_result
= f
;
1202 } else if (streq(key
, "control-pid")) {
1205 if (parse_pid(value
, &pid
) < 0)
1206 log_unit_debug(u
, "Failed to parse control-pid value: %s", value
);
1208 m
->control_pid
= pid
;
1209 } else if (streq(key
, "control-command")) {
1210 MountExecCommand id
;
1212 id
= mount_exec_command_from_string(value
);
1214 log_unit_debug(u
, "Failed to parse exec-command value: %s", value
);
1216 m
->control_command_id
= id
;
1217 m
->control_command
= m
->exec_command
+ id
;
1220 log_unit_debug(u
, "Unknown serialization key: %s", key
);
1225 _pure_
static UnitActiveState
mount_active_state(Unit
*u
) {
1228 return state_translation_table
[MOUNT(u
)->state
];
1231 _pure_
static const char *mount_sub_state_to_string(Unit
*u
) {
1234 return mount_state_to_string(MOUNT(u
)->state
);
1237 _pure_
static bool mount_check_gc(Unit
*u
) {
1238 Mount
*m
= MOUNT(u
);
1242 return m
->from_proc_self_mountinfo
;
1245 static void mount_sigchld_event(Unit
*u
, pid_t pid
, int code
, int status
) {
1246 Mount
*m
= MOUNT(u
);
1252 if (pid
!= m
->control_pid
)
1257 if (is_clean_exit(code
, status
, EXIT_CLEAN_COMMAND
, NULL
))
1259 else if (code
== CLD_EXITED
)
1260 f
= MOUNT_FAILURE_EXIT_CODE
;
1261 else if (code
== CLD_KILLED
)
1262 f
= MOUNT_FAILURE_SIGNAL
;
1263 else if (code
== CLD_DUMPED
)
1264 f
= MOUNT_FAILURE_CORE_DUMP
;
1266 assert_not_reached("Unknown code");
1268 if (IN_SET(m
->state
, MOUNT_REMOUNTING
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_REMOUNTING_SIGTERM
))
1269 mount_set_reload_result(m
, f
);
1270 else if (m
->result
== MOUNT_SUCCESS
)
1273 if (m
->control_command
) {
1274 exec_status_exit(&m
->control_command
->exec_status
, &m
->exec_context
, pid
, code
, status
);
1276 m
->control_command
= NULL
;
1277 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
1280 log_unit_full(u
, f
== MOUNT_SUCCESS
? LOG_DEBUG
: LOG_NOTICE
, 0,
1281 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code
), status
);
1283 /* Note that mount(8) returning and the kernel sending us a mount table change event might happen
1284 * out-of-order. If an operation succeed we assume the kernel will follow soon too and already change into the
1285 * resulting state. If it fails we check if the kernel still knows about the mount. and change state
1290 case MOUNT_MOUNTING
:
1291 case MOUNT_MOUNTING_DONE
:
1293 if (f
== MOUNT_SUCCESS
|| m
->from_proc_self_mountinfo
)
1294 /* If /bin/mount returned success, or if we see the mount point in /proc/self/mountinfo we are
1295 * happy. If we see the first condition first, we should see the second condition
1296 * immediately after – or /bin/mount lies to us and is broken. */
1297 mount_enter_mounted(m
, f
);
1299 mount_enter_dead(m
, f
);
1302 case MOUNT_REMOUNTING
:
1303 case MOUNT_REMOUNTING_SIGTERM
:
1304 case MOUNT_REMOUNTING_SIGKILL
:
1305 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1308 case MOUNT_UNMOUNTING
:
1309 case MOUNT_UNMOUNTING_SIGKILL
:
1310 case MOUNT_UNMOUNTING_SIGTERM
:
1312 if (m
->from_proc_self_mountinfo
) {
1314 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1315 * stacked on top of each other. Note that due to the io event priority logic we can be sure
1316 * the new mountinfo is loaded before we process the SIGCHLD for the mount command. */
1318 if (m
->n_retry_umount
< RETRY_UMOUNT_MAX
) {
1319 log_unit_debug(u
, "Mount still present, trying again.");
1320 m
->n_retry_umount
++;
1321 mount_enter_unmounting(m
);
1323 log_unit_debug(u
, "Mount still present after %u attempts to unmount, giving up.", m
->n_retry_umount
);
1324 mount_enter_mounted(m
, f
);
1327 mount_enter_dead(m
, f
);
1332 assert_not_reached("Uh, control process died at wrong time.");
1335 /* Notify clients about changed exit status */
1336 unit_add_to_dbus_queue(u
);
1339 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
1340 Mount
*m
= MOUNT(userdata
);
1343 assert(m
->timer_event_source
== source
);
1347 case MOUNT_MOUNTING
:
1348 case MOUNT_MOUNTING_DONE
:
1349 log_unit_warning(UNIT(m
), "Mounting timed out. Terminating.");
1350 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1353 case MOUNT_REMOUNTING
:
1354 log_unit_warning(UNIT(m
), "Remounting timed out. Terminating remount process.");
1355 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1356 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_SUCCESS
);
1359 case MOUNT_REMOUNTING_SIGTERM
:
1360 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1362 if (m
->kill_context
.send_sigkill
) {
1363 log_unit_warning(UNIT(m
), "Remounting timed out. Killing.");
1364 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
1366 log_unit_warning(UNIT(m
), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1367 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1371 case MOUNT_REMOUNTING_SIGKILL
:
1372 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1374 log_unit_warning(UNIT(m
), "Mount process still around after SIGKILL. Ignoring.");
1375 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1378 case MOUNT_UNMOUNTING
:
1379 log_unit_warning(UNIT(m
), "Unmounting timed out. Terminating.");
1380 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1383 case MOUNT_UNMOUNTING_SIGTERM
:
1384 if (m
->kill_context
.send_sigkill
) {
1385 log_unit_warning(UNIT(m
), "Mount process timed out. Killing.");
1386 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1388 log_unit_warning(UNIT(m
), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1389 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1393 case MOUNT_UNMOUNTING_SIGKILL
:
1394 log_unit_warning(UNIT(m
), "Mount process still around after SIGKILL. Ignoring.");
1395 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1399 assert_not_reached("Timeout at wrong time.");
1411 static int mount_setup_new_unit(
1415 const char *options
,
1417 MountSetupFlags
*flags
) {
1424 u
->source_path
= strdup("/proc/self/mountinfo");
1425 MOUNT(u
)->where
= strdup(where
);
1426 if (!u
->source_path
|| !MOUNT(u
)->where
)
1429 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1430 MOUNT(u
)->from_proc_self_mountinfo
= true;
1431 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1433 p
->what
= strdup(what
);
1434 p
->options
= strdup(options
);
1435 p
->fstype
= strdup(fstype
);
1436 if (!p
->what
|| !p
->options
|| !p
->fstype
)
1439 if (!mount_is_extrinsic(MOUNT(u
))) {
1443 target
= mount_is_network(p
) ? SPECIAL_REMOTE_FS_TARGET
: SPECIAL_LOCAL_FS_TARGET
;
1444 r
= unit_add_dependency_by_name(u
, UNIT_BEFORE
, target
, NULL
, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
1448 r
= unit_add_dependency_by_name(u
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
1453 unit_add_to_load_queue(u
);
1454 flags
->is_mounted
= true;
1455 flags
->just_mounted
= true;
1456 flags
->just_changed
= true;
1461 static int mount_setup_existing_unit(
1465 const char *options
,
1467 MountSetupFlags
*flags
) {
1470 bool load_extras
= false;
1476 if (!MOUNT(u
)->where
) {
1477 MOUNT(u
)->where
= strdup(where
);
1478 if (!MOUNT(u
)->where
)
1482 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1483 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1485 r1
= free_and_strdup(&p
->what
, what
);
1486 r2
= free_and_strdup(&p
->options
, options
);
1487 r3
= free_and_strdup(&p
->fstype
, fstype
);
1488 if (r1
< 0 || r2
< 0 || r3
< 0)
1491 flags
->just_changed
= r1
> 0 || r2
> 0 || r3
> 0;
1492 flags
->is_mounted
= true;
1493 flags
->just_mounted
= !MOUNT(u
)->from_proc_self_mountinfo
|| MOUNT(u
)->just_mounted
;
1495 MOUNT(u
)->from_proc_self_mountinfo
= true;
1497 if (!mount_is_extrinsic(MOUNT(u
)) && mount_is_network(p
)) {
1498 /* _netdev option may have shown up late, or on a
1499 * remount. Add remote-fs dependencies, even though
1500 * local-fs ones may already be there.
1502 * Note: due to a current limitation (we don't track
1503 * in the dependency "Set*" objects who created a
1504 * dependency), we can only add deps, never lose them,
1505 * until the next full daemon-reload. */
1506 unit_add_dependency_by_name(u
, UNIT_BEFORE
, SPECIAL_REMOTE_FS_TARGET
, NULL
, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
1510 if (u
->load_state
== UNIT_NOT_FOUND
) {
1511 u
->load_state
= UNIT_LOADED
;
1514 /* Load in the extras later on, after we
1515 * finished initialization of the unit */
1517 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1519 flags
->just_changed
= true;
1523 return mount_add_extras(MOUNT(u
));
1528 static int mount_setup_unit(
1532 const char *options
,
1536 _cleanup_free_
char *e
= NULL
;
1537 MountSetupFlags flags
;
1547 /* Ignore API mount points. They should never be referenced in
1548 * dependencies ever. */
1549 if (mount_point_is_api(where
) || mount_point_ignore(where
))
1552 if (streq(fstype
, "autofs"))
1555 /* probably some kind of swap, ignore */
1556 if (!is_path(where
))
1559 r
= unit_name_from_path(where
, ".mount", &e
);
1563 u
= manager_get_unit(m
, e
);
1565 /* First time we see this mount point meaning that it's
1566 * not been initiated by a mount unit but rather by the
1567 * sysadmin having called mount(8) directly. */
1568 r
= unit_new_for_name(m
, sizeof(Mount
), e
, &u
);
1572 r
= mount_setup_new_unit(u
, what
, where
, options
, fstype
, &flags
);
1576 r
= mount_setup_existing_unit(u
, what
, where
, options
, fstype
, &flags
);
1582 MOUNT(u
)->is_mounted
= flags
.is_mounted
;
1583 MOUNT(u
)->just_mounted
= flags
.just_mounted
;
1584 MOUNT(u
)->just_changed
= flags
.just_changed
;
1587 if (flags
.just_changed
)
1588 unit_add_to_dbus_queue(u
);
1592 log_warning_errno(r
, "Failed to set up mount unit: %m");
1596 static int mount_load_proc_self_mountinfo(Manager
*m
, bool set_flags
) {
1597 _cleanup_(mnt_free_tablep
) struct libmnt_table
*t
= NULL
;
1598 _cleanup_(mnt_free_iterp
) struct libmnt_iter
*i
= NULL
;
1603 t
= mnt_new_table();
1607 i
= mnt_new_iter(MNT_ITER_FORWARD
);
1611 r
= mnt_table_parse_mtab(t
, NULL
);
1613 return log_error_errno(r
, "Failed to parse /proc/self/mountinfo: %m");
1617 const char *device
, *path
, *options
, *fstype
;
1618 _cleanup_free_
char *d
= NULL
, *p
= NULL
;
1619 struct libmnt_fs
*fs
;
1622 k
= mnt_table_next_fs(t
, i
, &fs
);
1626 return log_error_errno(k
, "Failed to get next entry from /proc/self/mountinfo: %m");
1628 device
= mnt_fs_get_source(fs
);
1629 path
= mnt_fs_get_target(fs
);
1630 options
= mnt_fs_get_options(fs
);
1631 fstype
= mnt_fs_get_fstype(fs
);
1633 if (!device
|| !path
)
1636 if (cunescape(device
, UNESCAPE_RELAX
, &d
) < 0)
1639 if (cunescape(path
, UNESCAPE_RELAX
, &p
) < 0)
1642 (void) device_found_node(m
, d
, true, DEVICE_FOUND_MOUNT
, set_flags
);
1644 k
= mount_setup_unit(m
, d
, p
, options
, fstype
, set_flags
);
1645 if (r
== 0 && k
< 0)
1652 static void mount_shutdown(Manager
*m
) {
1655 m
->mount_event_source
= sd_event_source_unref(m
->mount_event_source
);
1657 mnt_unref_monitor(m
->mount_monitor
);
1658 m
->mount_monitor
= NULL
;
1661 static int mount_get_timeout(Unit
*u
, usec_t
*timeout
) {
1662 Mount
*m
= MOUNT(u
);
1666 if (!m
->timer_event_source
)
1669 r
= sd_event_source_get_time(m
->timer_event_source
, &t
);
1672 if (t
== USEC_INFINITY
)
1679 static int synthesize_root_mount(Manager
*m
) {
1685 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1686 * unconditionally synthesize it here and mark it as perpetual. */
1688 u
= manager_get_unit(m
, SPECIAL_ROOT_MOUNT
);
1690 r
= unit_new_for_name(m
, sizeof(Mount
), SPECIAL_ROOT_MOUNT
, &u
);
1692 return log_error_errno(r
, "Failed to allocate the special " SPECIAL_ROOT_MOUNT
" unit: %m");
1695 u
->perpetual
= true;
1696 MOUNT(u
)->deserialized_state
= MOUNT_MOUNTED
;
1698 unit_add_to_load_queue(u
);
1699 unit_add_to_dbus_queue(u
);
1704 static bool mount_is_mounted(Mount
*m
) {
1707 return UNIT(m
)->perpetual
|| m
->is_mounted
;
1710 static void mount_enumerate(Manager
*m
) {
1715 r
= synthesize_root_mount(m
);
1721 if (!m
->mount_monitor
) {
1724 m
->mount_monitor
= mnt_new_monitor();
1725 if (!m
->mount_monitor
) {
1730 r
= mnt_monitor_enable_kernel(m
->mount_monitor
, 1);
1732 log_error_errno(r
, "Failed to enable watching of kernel mount events: %m");
1736 r
= mnt_monitor_enable_userspace(m
->mount_monitor
, 1, NULL
);
1738 log_error_errno(r
, "Failed to enable watching of userspace mount events: %m");
1742 /* mnt_unref_monitor() will close the fd */
1743 fd
= r
= mnt_monitor_get_fd(m
->mount_monitor
);
1745 log_error_errno(r
, "Failed to acquire watch file descriptor: %m");
1749 r
= sd_event_add_io(m
->event
, &m
->mount_event_source
, fd
, EPOLLIN
, mount_dispatch_io
, m
);
1751 log_error_errno(r
, "Failed to watch mount file descriptor: %m");
1755 r
= sd_event_source_set_priority(m
->mount_event_source
, -10);
1757 log_error_errno(r
, "Failed to adjust mount watch priority: %m");
1761 (void) sd_event_source_set_description(m
->mount_event_source
, "mount-monitor-dispatch");
1764 r
= mount_load_proc_self_mountinfo(m
, false);
1774 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
1775 _cleanup_set_free_ Set
*around
= NULL
, *gone
= NULL
;
1776 Manager
*m
= userdata
;
1783 assert(revents
& EPOLLIN
);
1785 if (fd
== mnt_monitor_get_fd(m
->mount_monitor
)) {
1786 bool rescan
= false;
1788 /* Drain all events and verify that the event is valid.
1790 * Note that libmount also monitors /run/mount mkdir if the
1791 * directory does not exist yet. The mkdir may generate event
1792 * which is irrelevant for us.
1794 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1796 r
= mnt_monitor_next_change(m
->mount_monitor
, NULL
, NULL
);
1800 return log_error_errno(r
, "Failed to drain libmount events");
1803 log_debug("libmount event [rescan: %s]", yes_no(rescan
));
1808 r
= mount_load_proc_self_mountinfo(m
, true);
1810 /* Reset flags, just in case, for later calls */
1811 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1812 Mount
*mount
= MOUNT(u
);
1814 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1820 manager_dispatch_load_queue(m
);
1822 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1823 Mount
*mount
= MOUNT(u
);
1825 if (!mount_is_mounted(mount
)) {
1827 /* A mount point is not around right now. It
1828 * might be gone, or might never have
1831 if (mount
->from_proc_self_mountinfo
&&
1832 mount
->parameters_proc_self_mountinfo
.what
) {
1834 /* Remember that this device might just have disappeared */
1835 if (set_ensure_allocated(&gone
, &string_hash_ops
) < 0 ||
1836 set_put(gone
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1837 log_oom(); /* we don't care too much about OOM here... */
1840 mount
->from_proc_self_mountinfo
= false;
1842 switch (mount
->state
) {
1845 /* This has just been unmounted by
1846 * somebody else, follow the state
1848 mount
->result
= MOUNT_SUCCESS
; /* make sure we forget any earlier umount failures */
1849 mount_enter_dead(mount
, MOUNT_SUCCESS
);
1856 } else if (mount
->just_mounted
|| mount
->just_changed
) {
1858 /* A mount point was added or changed */
1860 switch (mount
->state
) {
1865 /* This has just been mounted by somebody else, follow the state change, but let's
1866 * generate a new invocation ID for this implicitly and automatically. */
1867 (void) unit_acquire_invocation_id(UNIT(mount
));
1868 mount_enter_mounted(mount
, MOUNT_SUCCESS
);
1871 case MOUNT_MOUNTING
:
1872 mount_set_state(mount
, MOUNT_MOUNTING_DONE
);
1876 /* Nothing really changed, but let's
1877 * issue an notification call
1878 * nonetheless, in case somebody is
1879 * waiting for this. (e.g. file system
1880 * ro/rw remounts.) */
1881 mount_set_state(mount
, mount
->state
);
1886 if (mount_is_mounted(mount
) &&
1887 mount
->from_proc_self_mountinfo
&&
1888 mount
->parameters_proc_self_mountinfo
.what
) {
1890 if (set_ensure_allocated(&around
, &string_hash_ops
) < 0 ||
1891 set_put(around
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1895 /* Reset the flags for later calls */
1896 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1899 SET_FOREACH(what
, gone
, i
) {
1900 if (set_contains(around
, what
))
1903 /* Let the device units know that the device is no longer mounted */
1904 (void) device_found_node(m
, what
, false, DEVICE_FOUND_MOUNT
, true);
1910 static void mount_reset_failed(Unit
*u
) {
1911 Mount
*m
= MOUNT(u
);
1915 if (m
->state
== MOUNT_FAILED
)
1916 mount_set_state(m
, MOUNT_DEAD
);
1918 m
->result
= MOUNT_SUCCESS
;
1919 m
->reload_result
= MOUNT_SUCCESS
;
1922 static int mount_kill(Unit
*u
, KillWho who
, int signo
, sd_bus_error
*error
) {
1923 Mount
*m
= MOUNT(u
);
1927 return unit_kill_common(u
, who
, signo
, -1, MOUNT(u
)->control_pid
, error
);
1930 static int mount_control_pid(Unit
*u
) {
1931 Mount
*m
= MOUNT(u
);
1935 return m
->control_pid
;
1938 static const char* const mount_exec_command_table
[_MOUNT_EXEC_COMMAND_MAX
] = {
1939 [MOUNT_EXEC_MOUNT
] = "ExecMount",
1940 [MOUNT_EXEC_UNMOUNT
] = "ExecUnmount",
1941 [MOUNT_EXEC_REMOUNT
] = "ExecRemount",
1944 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command
, MountExecCommand
);
1946 static const char* const mount_result_table
[_MOUNT_RESULT_MAX
] = {
1947 [MOUNT_SUCCESS
] = "success",
1948 [MOUNT_FAILURE_RESOURCES
] = "resources",
1949 [MOUNT_FAILURE_TIMEOUT
] = "timeout",
1950 [MOUNT_FAILURE_EXIT_CODE
] = "exit-code",
1951 [MOUNT_FAILURE_SIGNAL
] = "signal",
1952 [MOUNT_FAILURE_CORE_DUMP
] = "core-dump",
1953 [MOUNT_FAILURE_START_LIMIT_HIT
] = "start-limit-hit",
1956 DEFINE_STRING_TABLE_LOOKUP(mount_result
, MountResult
);
1958 const UnitVTable mount_vtable
= {
1959 .object_size
= sizeof(Mount
),
1960 .exec_context_offset
= offsetof(Mount
, exec_context
),
1961 .cgroup_context_offset
= offsetof(Mount
, cgroup_context
),
1962 .kill_context_offset
= offsetof(Mount
, kill_context
),
1963 .exec_runtime_offset
= offsetof(Mount
, exec_runtime
),
1964 .dynamic_creds_offset
= offsetof(Mount
, dynamic_creds
),
1970 .private_section
= "Mount",
1976 .coldplug
= mount_coldplug
,
1980 .start
= mount_start
,
1982 .reload
= mount_reload
,
1986 .serialize
= mount_serialize
,
1987 .deserialize_item
= mount_deserialize_item
,
1989 .active_state
= mount_active_state
,
1990 .sub_state_to_string
= mount_sub_state_to_string
,
1992 .check_gc
= mount_check_gc
,
1994 .sigchld_event
= mount_sigchld_event
,
1996 .reset_failed
= mount_reset_failed
,
1998 .control_pid
= mount_control_pid
,
2000 .bus_vtable
= bus_mount_vtable
,
2001 .bus_set_property
= bus_mount_set_property
,
2002 .bus_commit_properties
= bus_mount_commit_properties
,
2004 .get_timeout
= mount_get_timeout
,
2006 .can_transient
= true,
2008 .enumerate
= mount_enumerate
,
2009 .shutdown
= mount_shutdown
,
2011 .status_message_formats
= {
2012 .starting_stopping
= {
2013 [0] = "Mounting %s...",
2014 [1] = "Unmounting %s...",
2016 .finished_start_job
= {
2017 [JOB_DONE
] = "Mounted %s.",
2018 [JOB_FAILED
] = "Failed to mount %s.",
2019 [JOB_TIMEOUT
] = "Timed out mounting %s.",
2021 .finished_stop_job
= {
2022 [JOB_DONE
] = "Unmounted %s.",
2023 [JOB_FAILED
] = "Failed unmounting %s.",
2024 [JOB_TIMEOUT
] = "Timed out unmounting %s.",