1 /* SPDX-License-Identifier: LGPL-2.1+ */
10 #include "sd-messages.h"
12 #include "alloc-util.h"
13 #include "dbus-mount.h"
16 #include "exit-status.h"
17 #include "format-util.h"
18 #include "fstab-util.h"
22 #include "mount-setup.h"
23 #include "mount-util.h"
25 #include "parse-util.h"
26 #include "path-util.h"
27 #include "process-util.h"
29 #include "string-table.h"
30 #include "string-util.h"
32 #include "unit-name.h"
35 #define RETRY_UMOUNT_MAX 32
37 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table
*, mnt_free_table
);
38 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter
*, mnt_free_iter
);
40 static const UnitActiveState state_translation_table
[_MOUNT_STATE_MAX
] = {
41 [MOUNT_DEAD
] = UNIT_INACTIVE
,
42 [MOUNT_MOUNTING
] = UNIT_ACTIVATING
,
43 [MOUNT_MOUNTING_DONE
] = UNIT_ACTIVATING
,
44 [MOUNT_MOUNTED
] = UNIT_ACTIVE
,
45 [MOUNT_REMOUNTING
] = UNIT_RELOADING
,
46 [MOUNT_UNMOUNTING
] = UNIT_DEACTIVATING
,
47 [MOUNT_REMOUNTING_SIGTERM
] = UNIT_RELOADING
,
48 [MOUNT_REMOUNTING_SIGKILL
] = UNIT_RELOADING
,
49 [MOUNT_UNMOUNTING_SIGTERM
] = UNIT_DEACTIVATING
,
50 [MOUNT_UNMOUNTING_SIGKILL
] = UNIT_DEACTIVATING
,
51 [MOUNT_FAILED
] = UNIT_FAILED
54 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
);
55 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
);
57 static bool MOUNT_STATE_WITH_PROCESS(MountState state
) {
62 MOUNT_REMOUNTING_SIGTERM
,
63 MOUNT_REMOUNTING_SIGKILL
,
65 MOUNT_UNMOUNTING_SIGTERM
,
66 MOUNT_UNMOUNTING_SIGKILL
);
69 static bool mount_needs_network(const char *options
, const char *fstype
) {
70 if (fstab_test_option(options
, "_netdev\0"))
73 if (fstype
&& fstype_is_network(fstype
))
79 static bool mount_is_network(const MountParameters
*p
) {
82 return mount_needs_network(p
->options
, p
->fstype
);
85 static bool mount_is_loop(const MountParameters
*p
) {
88 if (fstab_test_option(p
->options
, "loop\0"))
94 static bool mount_is_bind(const MountParameters
*p
) {
97 if (fstab_test_option(p
->options
, "bind\0" "rbind\0"))
100 if (p
->fstype
&& STR_IN_SET(p
->fstype
, "bind", "rbind"))
106 static bool mount_is_auto(const MountParameters
*p
) {
109 return !fstab_test_option(p
->options
, "noauto\0");
112 static bool mount_is_automount(const MountParameters
*p
) {
115 return fstab_test_option(p
->options
,
116 "comment=systemd.automount\0"
117 "x-systemd.automount\0");
120 static bool mount_is_bound_to_device(const Mount
*m
) {
121 const MountParameters
*p
;
123 if (m
->from_fragment
)
126 p
= &m
->parameters_proc_self_mountinfo
;
127 return fstab_test_option(p
->options
, "x-systemd.device-bound\0");
130 static bool needs_quota(const MountParameters
*p
) {
133 /* Quotas are not enabled on network filesystems,
134 * but we want them, for example, on storage connected via iscsi */
135 if (p
->fstype
&& fstype_is_network(p
->fstype
))
138 if (mount_is_bind(p
))
141 return fstab_test_option(p
->options
,
142 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
145 static void mount_init(Unit
*u
) {
149 assert(u
->load_state
== UNIT_STUB
);
151 m
->timeout_usec
= u
->manager
->default_timeout_start_usec
;
153 m
->exec_context
.std_output
= u
->manager
->default_std_output
;
154 m
->exec_context
.std_error
= u
->manager
->default_std_error
;
156 m
->directory_mode
= 0755;
158 /* We need to make sure that /usr/bin/mount is always called
159 * in the same process group as us, so that the autofs kernel
160 * side doesn't send us another mount request while we are
161 * already trying to comply its last one. */
162 m
->exec_context
.same_pgrp
= true;
164 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
166 u
->ignore_on_isolate
= true;
169 static int mount_arm_timer(Mount
*m
, usec_t usec
) {
174 if (m
->timer_event_source
) {
175 r
= sd_event_source_set_time(m
->timer_event_source
, usec
);
179 return sd_event_source_set_enabled(m
->timer_event_source
, SD_EVENT_ONESHOT
);
182 if (usec
== USEC_INFINITY
)
185 r
= sd_event_add_time(
186 UNIT(m
)->manager
->event
,
187 &m
->timer_event_source
,
190 mount_dispatch_timer
, m
);
194 (void) sd_event_source_set_description(m
->timer_event_source
, "mount-timer");
199 static void mount_unwatch_control_pid(Mount
*m
) {
202 if (m
->control_pid
<= 0)
205 unit_unwatch_pid(UNIT(m
), m
->control_pid
);
209 static void mount_parameters_done(MountParameters
*p
) {
216 p
->what
= p
->options
= p
->fstype
= NULL
;
219 static void mount_done(Unit
*u
) {
224 m
->where
= mfree(m
->where
);
226 mount_parameters_done(&m
->parameters_proc_self_mountinfo
);
227 mount_parameters_done(&m
->parameters_fragment
);
229 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
, false);
230 exec_command_done_array(m
->exec_command
, _MOUNT_EXEC_COMMAND_MAX
);
231 m
->control_command
= NULL
;
233 dynamic_creds_unref(&m
->dynamic_creds
);
235 mount_unwatch_control_pid(m
);
237 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
240 _pure_
static MountParameters
* get_mount_parameters_fragment(Mount
*m
) {
243 if (m
->from_fragment
)
244 return &m
->parameters_fragment
;
249 _pure_
static MountParameters
* get_mount_parameters(Mount
*m
) {
252 if (m
->from_proc_self_mountinfo
)
253 return &m
->parameters_proc_self_mountinfo
;
255 return get_mount_parameters_fragment(m
);
258 static int mount_add_mount_dependencies(Mount
*m
) {
267 if (!path_equal(m
->where
, "/")) {
268 _cleanup_free_
char *parent
= NULL
;
270 /* Adds in links to other mount points that might lie further up in the hierarchy */
272 parent
= dirname_malloc(m
->where
);
276 r
= unit_require_mounts_for(UNIT(m
), parent
, UNIT_DEPENDENCY_IMPLICIT
);
281 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
282 * or a loop mount) to be available. */
283 pm
= get_mount_parameters_fragment(m
);
284 if (pm
&& pm
->what
&&
285 path_is_absolute(pm
->what
) &&
286 (mount_is_bind(pm
) || mount_is_loop(pm
) || !mount_is_network(pm
))) {
288 r
= unit_require_mounts_for(UNIT(m
), pm
->what
, UNIT_DEPENDENCY_FILE
);
293 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
294 s
= manager_get_units_requiring_mounts_for(UNIT(m
)->manager
, m
->where
);
295 SET_FOREACH(other
, s
, i
) {
297 if (other
->load_state
!= UNIT_LOADED
)
300 if (other
== UNIT(m
))
303 r
= unit_add_dependency(other
, UNIT_AFTER
, UNIT(m
), true, UNIT_DEPENDENCY_PATH
);
307 if (UNIT(m
)->fragment_path
) {
308 /* If we have fragment configuration, then make this dependency required */
309 r
= unit_add_dependency(other
, UNIT_REQUIRES
, UNIT(m
), true, UNIT_DEPENDENCY_PATH
);
318 static int mount_add_device_dependencies(Mount
*m
) {
319 bool device_wants_mount
= false;
320 UnitDependencyMask mask
;
327 p
= get_mount_parameters(m
);
334 if (mount_is_bind(p
))
337 if (!is_device_path(p
->what
))
340 /* /dev/root is a really weird thing, it's not a real device,
341 * but just a path the kernel exports for the root file system
342 * specified on the kernel command line. Ignore it here. */
343 if (path_equal(p
->what
, "/dev/root"))
346 if (path_equal(m
->where
, "/"))
349 if (mount_is_auto(p
) && !mount_is_automount(p
) && MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
350 device_wants_mount
= true;
352 /* Mount units from /proc/self/mountinfo are not bound to devices
353 * by default since they're subject to races when devices are
354 * unplugged. But the user can still force this dep with an
355 * appropriate option (or udev property) so the mount units are
356 * automatically stopped when the device disappears suddenly. */
357 dep
= mount_is_bound_to_device(m
) ? UNIT_BINDS_TO
: UNIT_REQUIRES
;
359 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
;
361 r
= unit_add_node_dependency(UNIT(m
), p
->what
, device_wants_mount
, dep
, mask
);
368 static int mount_add_quota_dependencies(Mount
*m
) {
369 UnitDependencyMask mask
;
375 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
378 p
= get_mount_parameters_fragment(m
);
385 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
;
387 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTACHECK_SERVICE
, NULL
, true, mask
);
391 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTAON_SERVICE
, NULL
, true, mask
);
398 static bool mount_is_extrinsic(Mount
*m
) {
402 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
403 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
404 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
406 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
)) /* We only automatically manage mounts if we are in system mode */
409 if (PATH_IN_SET(m
->where
, /* Don't bother with the OS data itself */
414 if (PATH_STARTSWITH_SET(m
->where
,
415 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
416 "/proc", /* All of this is API VFS */
417 "/sys", /* … dito … */
418 "/dev")) /* … dito … */
421 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
422 p
= get_mount_parameters(m
);
423 if (p
&& fstab_test_option(p
->options
, "x-initrd.mount\0") && !in_initrd())
429 static int mount_add_default_dependencies(Mount
*m
) {
430 UnitDependencyMask mask
;
437 if (!UNIT(m
)->default_dependencies
)
440 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
441 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
442 * file systems, it's also going to be virtual, and hence not worth the effort. */
443 if (mount_is_extrinsic(m
))
446 p
= get_mount_parameters(m
);
450 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_DEFAULT
;
452 if (mount_is_network(p
)) {
453 /* We order ourselves after network.target. This is
454 * primarily useful at shutdown: services that take
455 * down the network should order themselves before
456 * network.target, so that they are shut down only
457 * after this mount unit is stopped. */
459 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_NETWORK_TARGET
, NULL
, true, mask
);
463 /* We pull in network-online.target, and order
464 * ourselves after it. This is useful at start-up to
465 * actively pull in tools that want to be started
466 * before we start mounting network file systems, and
467 * whose purpose it is to delay this until the network
470 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_WANTS
, UNIT_AFTER
, SPECIAL_NETWORK_ONLINE_TARGET
, NULL
, true, mask
);
474 after
= SPECIAL_REMOTE_FS_PRE_TARGET
;
476 after
= SPECIAL_LOCAL_FS_PRE_TARGET
;
478 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, after
, NULL
, true, mask
);
482 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true, mask
);
486 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
487 if (streq_ptr(p
->fstype
, "tmpfs")) {
488 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_SWAP_TARGET
, NULL
, true, mask
);
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
&& !UNIT(m
)->perpetual
)
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_simplify(m
->where
, false);
554 if (!u
->description
) {
555 r
= unit_set_description(u
, m
->where
);
560 r
= mount_add_device_dependencies(m
);
564 r
= mount_add_mount_dependencies(m
);
568 r
= mount_add_quota_dependencies(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_WITH_PROCESS(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
],
656 m
->reload_result
== MOUNT_SUCCESS
? 0 : UNIT_NOTIFY_RELOAD_FAILURE
);
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_WITH_PROCESS(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
);
690 (void) unit_setup_exec_runtime(u
);
693 mount_set_state(m
, new_state
);
697 static void mount_dump(Unit
*u
, FILE *f
, const char *prefix
) {
698 char buf
[FORMAT_TIMESPAN_MAX
];
705 p
= get_mount_parameters(m
);
708 "%sMount State: %s\n"
712 "%sFile System Type: %s\n"
714 "%sFrom /proc/self/mountinfo: %s\n"
715 "%sFrom fragment: %s\n"
717 "%sDirectoryMode: %04o\n"
718 "%sSloppyOptions: %s\n"
719 "%sLazyUnmount: %s\n"
720 "%sForceUnmount: %s\n"
722 prefix
, mount_state_to_string(m
->state
),
723 prefix
, mount_result_to_string(m
->result
),
725 prefix
, p
? strna(p
->what
) : "n/a",
726 prefix
, p
? strna(p
->fstype
) : "n/a",
727 prefix
, p
? strna(p
->options
) : "n/a",
728 prefix
, yes_no(m
->from_proc_self_mountinfo
),
729 prefix
, yes_no(m
->from_fragment
),
730 prefix
, yes_no(mount_is_extrinsic(m
)),
731 prefix
, m
->directory_mode
,
732 prefix
, yes_no(m
->sloppy_options
),
733 prefix
, yes_no(m
->lazy_unmount
),
734 prefix
, yes_no(m
->force_unmount
),
735 prefix
, format_timespan(buf
, sizeof(buf
), m
->timeout_usec
, USEC_PER_SEC
));
737 if (m
->control_pid
> 0)
739 "%sControl PID: "PID_FMT
"\n",
740 prefix
, m
->control_pid
);
742 exec_context_dump(&m
->exec_context
, f
, prefix
);
743 kill_context_dump(&m
->kill_context
, f
, prefix
);
744 cgroup_context_dump(&m
->cgroup_context
, f
, prefix
);
747 static int mount_spawn(Mount
*m
, ExecCommand
*c
, pid_t
*_pid
) {
749 ExecParameters exec_params
= {
750 .flags
= EXEC_APPLY_SANDBOXING
|EXEC_APPLY_CHROOT
|EXEC_APPLY_TTY_STDIN
,
763 r
= unit_prepare_exec(UNIT(m
));
767 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
771 unit_set_exec_params(UNIT(m
), &exec_params
);
773 r
= exec_spawn(UNIT(m
),
783 r
= unit_watch_pid(UNIT(m
), pid
);
785 /* FIXME: we need to do something here */
793 static void mount_enter_dead(Mount
*m
, MountResult f
) {
796 if (m
->result
== MOUNT_SUCCESS
)
799 if (m
->result
!= MOUNT_SUCCESS
)
800 log_unit_warning(UNIT(m
), "Failed with result '%s'.", mount_result_to_string(m
->result
));
802 mount_set_state(m
, m
->result
!= MOUNT_SUCCESS
? MOUNT_FAILED
: MOUNT_DEAD
);
804 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
, true);
806 exec_context_destroy_runtime_directory(&m
->exec_context
, UNIT(m
)->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
808 unit_unref_uid_gid(UNIT(m
), true);
810 dynamic_creds_destroy(&m
->dynamic_creds
);
813 static void mount_enter_mounted(Mount
*m
, MountResult f
) {
816 if (m
->result
== MOUNT_SUCCESS
)
819 mount_set_state(m
, MOUNT_MOUNTED
);
822 static void mount_enter_dead_or_mounted(Mount
*m
, MountResult f
) {
825 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
826 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
827 * ultimately we just mirror the kernel's internal state on this. */
829 if (m
->from_proc_self_mountinfo
)
830 mount_enter_mounted(m
, f
);
832 mount_enter_dead(m
, f
);
835 static int state_to_kill_operation(MountState state
) {
838 case MOUNT_REMOUNTING_SIGTERM
:
839 case MOUNT_UNMOUNTING_SIGTERM
:
840 return KILL_TERMINATE
;
842 case MOUNT_REMOUNTING_SIGKILL
:
843 case MOUNT_UNMOUNTING_SIGKILL
:
847 return _KILL_OPERATION_INVALID
;
851 static void mount_enter_signal(Mount
*m
, MountState state
, MountResult f
) {
856 if (m
->result
== MOUNT_SUCCESS
)
859 r
= unit_kill_context(
862 state_to_kill_operation(state
),
870 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
874 mount_set_state(m
, state
);
875 } else if (state
== MOUNT_REMOUNTING_SIGTERM
&& m
->kill_context
.send_sigkill
)
876 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
877 else if (IN_SET(state
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_REMOUNTING_SIGKILL
))
878 mount_enter_mounted(m
, MOUNT_SUCCESS
);
879 else if (state
== MOUNT_UNMOUNTING_SIGTERM
&& m
->kill_context
.send_sigkill
)
880 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
882 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
887 log_unit_warning_errno(UNIT(m
), r
, "Failed to kill processes: %m");
888 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
891 static void mount_enter_unmounting(Mount
*m
) {
896 /* Start counting our attempts */
897 if (!IN_SET(m
->state
,
899 MOUNT_UNMOUNTING_SIGTERM
,
900 MOUNT_UNMOUNTING_SIGKILL
))
901 m
->n_retry_umount
= 0;
903 m
->control_command_id
= MOUNT_EXEC_UNMOUNT
;
904 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_UNMOUNT
;
906 r
= exec_command_set(m
->control_command
, UMOUNT_PATH
, m
->where
, "-c", NULL
);
907 if (r
>= 0 && m
->lazy_unmount
)
908 r
= exec_command_append(m
->control_command
, "-l", NULL
);
909 if (r
>= 0 && m
->force_unmount
)
910 r
= exec_command_append(m
->control_command
, "-f", NULL
);
914 mount_unwatch_control_pid(m
);
916 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
920 mount_set_state(m
, MOUNT_UNMOUNTING
);
925 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'umount' task: %m");
926 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
929 static void mount_enter_mounting(Mount
*m
) {
935 r
= unit_fail_if_noncanonical(UNIT(m
), m
->where
);
939 (void) mkdir_p_label(m
->where
, m
->directory_mode
);
941 unit_warn_if_dir_nonempty(UNIT(m
), m
->where
);
943 unit_warn_leftover_processes(UNIT(m
));
945 m
->control_command_id
= MOUNT_EXEC_MOUNT
;
946 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_MOUNT
;
948 /* Create the source directory for bind-mounts if needed */
949 p
= get_mount_parameters_fragment(m
);
950 if (p
&& mount_is_bind(p
))
951 (void) mkdir_p_label(p
->what
, m
->directory_mode
);
954 _cleanup_free_
char *opts
= NULL
;
956 r
= fstab_filter_options(p
->options
, "nofail\0" "noauto\0" "auto\0", NULL
, NULL
, &opts
);
960 r
= exec_command_set(m
->control_command
, MOUNT_PATH
, p
->what
, m
->where
, NULL
);
961 if (r
>= 0 && m
->sloppy_options
)
962 r
= exec_command_append(m
->control_command
, "-s", NULL
);
963 if (r
>= 0 && p
->fstype
)
964 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
965 if (r
>= 0 && !isempty(opts
))
966 r
= exec_command_append(m
->control_command
, "-o", opts
, NULL
);
972 mount_unwatch_control_pid(m
);
974 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
978 mount_set_state(m
, MOUNT_MOUNTING
);
983 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'mount' task: %m");
984 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
987 static void mount_set_reload_result(Mount
*m
, MountResult result
) {
990 /* Only store the first error we encounter */
991 if (m
->reload_result
!= MOUNT_SUCCESS
)
994 m
->reload_result
= result
;
997 static void mount_enter_remounting(Mount
*m
) {
1003 /* Reset reload result when we are about to start a new remount operation */
1004 m
->reload_result
= MOUNT_SUCCESS
;
1006 m
->control_command_id
= MOUNT_EXEC_REMOUNT
;
1007 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_REMOUNT
;
1009 p
= get_mount_parameters_fragment(m
);
1014 o
= strjoina("remount,", p
->options
);
1018 r
= exec_command_set(m
->control_command
, MOUNT_PATH
,
1021 if (r
>= 0 && m
->sloppy_options
)
1022 r
= exec_command_append(m
->control_command
, "-s", NULL
);
1023 if (r
>= 0 && p
->fstype
)
1024 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
1030 mount_unwatch_control_pid(m
);
1032 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
1036 mount_set_state(m
, MOUNT_REMOUNTING
);
1041 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'remount' task: %m");
1042 mount_set_reload_result(m
, MOUNT_FAILURE_RESOURCES
);
1043 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1046 static int mount_start(Unit
*u
) {
1047 Mount
*m
= MOUNT(u
);
1052 /* We cannot fulfill this request right now, try again later
1054 if (IN_SET(m
->state
,
1056 MOUNT_UNMOUNTING_SIGTERM
,
1057 MOUNT_UNMOUNTING_SIGKILL
))
1060 /* Already on it! */
1061 if (m
->state
== MOUNT_MOUNTING
)
1064 assert(IN_SET(m
->state
, MOUNT_DEAD
, MOUNT_FAILED
));
1066 r
= unit_start_limit_test(u
);
1068 mount_enter_dead(m
, MOUNT_FAILURE_START_LIMIT_HIT
);
1072 r
= unit_acquire_invocation_id(u
);
1076 m
->result
= MOUNT_SUCCESS
;
1077 m
->reload_result
= MOUNT_SUCCESS
;
1078 exec_command_reset_status_array(m
->exec_command
, _MOUNT_EXEC_COMMAND_MAX
);
1080 u
->reset_accounting
= true;
1082 mount_enter_mounting(m
);
1086 static int mount_stop(Unit
*u
) {
1087 Mount
*m
= MOUNT(u
);
1093 case MOUNT_UNMOUNTING
:
1094 case MOUNT_UNMOUNTING_SIGKILL
:
1095 case MOUNT_UNMOUNTING_SIGTERM
:
1099 case MOUNT_MOUNTING
:
1100 case MOUNT_MOUNTING_DONE
:
1101 case MOUNT_REMOUNTING
:
1102 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1103 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_SUCCESS
);
1106 case MOUNT_REMOUNTING_SIGTERM
:
1107 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1108 mount_set_state(m
, MOUNT_UNMOUNTING_SIGTERM
);
1111 case MOUNT_REMOUNTING_SIGKILL
:
1113 mount_set_state(m
, MOUNT_UNMOUNTING_SIGKILL
);
1117 mount_enter_unmounting(m
);
1121 assert_not_reached("Unexpected state.");
1125 static int mount_reload(Unit
*u
) {
1126 Mount
*m
= MOUNT(u
);
1129 assert(m
->state
== MOUNT_MOUNTED
);
1131 mount_enter_remounting(m
);
1136 static int mount_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
1137 Mount
*m
= MOUNT(u
);
1143 unit_serialize_item(u
, f
, "state", mount_state_to_string(m
->state
));
1144 unit_serialize_item(u
, f
, "result", mount_result_to_string(m
->result
));
1145 unit_serialize_item(u
, f
, "reload-result", mount_result_to_string(m
->reload_result
));
1147 if (m
->control_pid
> 0)
1148 unit_serialize_item_format(u
, f
, "control-pid", PID_FMT
, m
->control_pid
);
1150 if (m
->control_command_id
>= 0)
1151 unit_serialize_item(u
, f
, "control-command", mount_exec_command_to_string(m
->control_command_id
));
1156 static int mount_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
1157 Mount
*m
= MOUNT(u
);
1164 if (streq(key
, "state")) {
1167 if ((state
= mount_state_from_string(value
)) < 0)
1168 log_unit_debug(u
, "Failed to parse state value: %s", value
);
1170 m
->deserialized_state
= state
;
1171 } else if (streq(key
, "result")) {
1174 f
= mount_result_from_string(value
);
1176 log_unit_debug(u
, "Failed to parse result value: %s", value
);
1177 else if (f
!= MOUNT_SUCCESS
)
1180 } else if (streq(key
, "reload-result")) {
1183 f
= mount_result_from_string(value
);
1185 log_unit_debug(u
, "Failed to parse reload result value: %s", value
);
1186 else if (f
!= MOUNT_SUCCESS
)
1187 m
->reload_result
= f
;
1189 } else if (streq(key
, "control-pid")) {
1192 if (parse_pid(value
, &pid
) < 0)
1193 log_unit_debug(u
, "Failed to parse control-pid value: %s", value
);
1195 m
->control_pid
= pid
;
1196 } else if (streq(key
, "control-command")) {
1197 MountExecCommand id
;
1199 id
= mount_exec_command_from_string(value
);
1201 log_unit_debug(u
, "Failed to parse exec-command value: %s", value
);
1203 m
->control_command_id
= id
;
1204 m
->control_command
= m
->exec_command
+ id
;
1207 log_unit_debug(u
, "Unknown serialization key: %s", key
);
1212 _pure_
static UnitActiveState
mount_active_state(Unit
*u
) {
1215 return state_translation_table
[MOUNT(u
)->state
];
1218 _pure_
static const char *mount_sub_state_to_string(Unit
*u
) {
1221 return mount_state_to_string(MOUNT(u
)->state
);
1224 _pure_
static bool mount_may_gc(Unit
*u
) {
1225 Mount
*m
= MOUNT(u
);
1229 if (m
->from_proc_self_mountinfo
)
1235 static void mount_sigchld_event(Unit
*u
, pid_t pid
, int code
, int status
) {
1236 Mount
*m
= MOUNT(u
);
1242 if (pid
!= m
->control_pid
)
1247 if (is_clean_exit(code
, status
, EXIT_CLEAN_COMMAND
, NULL
))
1249 else if (code
== CLD_EXITED
)
1250 f
= MOUNT_FAILURE_EXIT_CODE
;
1251 else if (code
== CLD_KILLED
)
1252 f
= MOUNT_FAILURE_SIGNAL
;
1253 else if (code
== CLD_DUMPED
)
1254 f
= MOUNT_FAILURE_CORE_DUMP
;
1256 assert_not_reached("Unknown code");
1258 if (IN_SET(m
->state
, MOUNT_REMOUNTING
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_REMOUNTING_SIGTERM
))
1259 mount_set_reload_result(m
, f
);
1260 else if (m
->result
== MOUNT_SUCCESS
)
1263 if (m
->control_command
) {
1264 exec_status_exit(&m
->control_command
->exec_status
, &m
->exec_context
, pid
, code
, status
);
1266 m
->control_command
= NULL
;
1267 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
1270 log_unit_full(u
, f
== MOUNT_SUCCESS
? LOG_DEBUG
: LOG_NOTICE
, 0,
1271 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code
), status
);
1273 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1274 * before we process the SIGCHLD for the mount command. */
1278 case MOUNT_MOUNTING
:
1279 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1281 if (f
== MOUNT_SUCCESS
) {
1282 /* Either /bin/mount has an unexpected definition of success,
1283 * or someone raced us and we lost. */
1284 log_unit_warning(UNIT(m
), "Mount process finished, but there is no mount.");
1285 f
= MOUNT_FAILURE_PROTOCOL
;
1287 mount_enter_dead(m
, f
);
1290 case MOUNT_MOUNTING_DONE
:
1291 mount_enter_mounted(m
, f
);
1294 case MOUNT_REMOUNTING
:
1295 case MOUNT_REMOUNTING_SIGTERM
:
1296 case MOUNT_REMOUNTING_SIGKILL
:
1297 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1300 case MOUNT_UNMOUNTING
:
1302 if (f
== MOUNT_SUCCESS
&& m
->from_proc_self_mountinfo
) {
1304 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1305 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1306 * but we will stop as soon as any one umount times out. */
1308 if (m
->n_retry_umount
< RETRY_UMOUNT_MAX
) {
1309 log_unit_debug(u
, "Mount still present, trying again.");
1310 m
->n_retry_umount
++;
1311 mount_enter_unmounting(m
);
1313 log_unit_warning(u
, "Mount still present after %u attempts to unmount, giving up.", m
->n_retry_umount
);
1314 mount_enter_mounted(m
, f
);
1317 mount_enter_dead_or_mounted(m
, f
);
1321 case MOUNT_UNMOUNTING_SIGKILL
:
1322 case MOUNT_UNMOUNTING_SIGTERM
:
1323 mount_enter_dead_or_mounted(m
, f
);
1327 assert_not_reached("Uh, control process died at wrong time.");
1330 /* Notify clients about changed exit status */
1331 unit_add_to_dbus_queue(u
);
1334 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
1335 Mount
*m
= MOUNT(userdata
);
1338 assert(m
->timer_event_source
== source
);
1342 case MOUNT_MOUNTING
:
1343 case MOUNT_MOUNTING_DONE
:
1344 log_unit_warning(UNIT(m
), "Mounting timed out. Terminating.");
1345 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1348 case MOUNT_REMOUNTING
:
1349 log_unit_warning(UNIT(m
), "Remounting timed out. Terminating remount process.");
1350 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1351 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_SUCCESS
);
1354 case MOUNT_REMOUNTING_SIGTERM
:
1355 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1357 if (m
->kill_context
.send_sigkill
) {
1358 log_unit_warning(UNIT(m
), "Remounting timed out. Killing.");
1359 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
1361 log_unit_warning(UNIT(m
), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1362 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1366 case MOUNT_REMOUNTING_SIGKILL
:
1367 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1369 log_unit_warning(UNIT(m
), "Mount process still around after SIGKILL. Ignoring.");
1370 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1373 case MOUNT_UNMOUNTING
:
1374 log_unit_warning(UNIT(m
), "Unmounting timed out. Terminating.");
1375 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1378 case MOUNT_UNMOUNTING_SIGTERM
:
1379 if (m
->kill_context
.send_sigkill
) {
1380 log_unit_warning(UNIT(m
), "Mount process timed out. Killing.");
1381 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1383 log_unit_warning(UNIT(m
), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1384 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1388 case MOUNT_UNMOUNTING_SIGKILL
:
1389 log_unit_warning(UNIT(m
), "Mount process still around after SIGKILL. Ignoring.");
1390 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1394 assert_not_reached("Timeout at wrong time.");
1406 static int mount_setup_new_unit(
1410 const char *options
,
1412 MountSetupFlags
*flags
) {
1419 u
->source_path
= strdup("/proc/self/mountinfo");
1420 MOUNT(u
)->where
= strdup(where
);
1421 if (!u
->source_path
|| !MOUNT(u
)->where
)
1424 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1425 MOUNT(u
)->from_proc_self_mountinfo
= true;
1426 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1428 p
->what
= strdup(what
);
1429 p
->options
= strdup(options
);
1430 p
->fstype
= strdup(fstype
);
1431 if (!p
->what
|| !p
->options
|| !p
->fstype
)
1434 if (!mount_is_extrinsic(MOUNT(u
))) {
1438 target
= mount_is_network(p
) ? SPECIAL_REMOTE_FS_TARGET
: SPECIAL_LOCAL_FS_TARGET
;
1439 r
= unit_add_dependency_by_name(u
, UNIT_BEFORE
, target
, NULL
, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
1443 r
= unit_add_dependency_by_name(u
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
1448 unit_add_to_load_queue(u
);
1449 flags
->is_mounted
= true;
1450 flags
->just_mounted
= true;
1451 flags
->just_changed
= true;
1456 static int mount_setup_existing_unit(
1460 const char *options
,
1462 MountSetupFlags
*flags
) {
1465 bool load_extras
= false;
1471 if (!MOUNT(u
)->where
) {
1472 MOUNT(u
)->where
= strdup(where
);
1473 if (!MOUNT(u
)->where
)
1477 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1478 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1480 r1
= free_and_strdup(&p
->what
, what
);
1481 r2
= free_and_strdup(&p
->options
, options
);
1482 r3
= free_and_strdup(&p
->fstype
, fstype
);
1483 if (r1
< 0 || r2
< 0 || r3
< 0)
1486 flags
->just_changed
= r1
> 0 || r2
> 0 || r3
> 0;
1487 flags
->is_mounted
= true;
1488 flags
->just_mounted
= !MOUNT(u
)->from_proc_self_mountinfo
|| MOUNT(u
)->just_mounted
;
1490 MOUNT(u
)->from_proc_self_mountinfo
= true;
1492 if (!mount_is_extrinsic(MOUNT(u
)) && mount_is_network(p
)) {
1493 /* _netdev option may have shown up late, or on a
1494 * remount. Add remote-fs dependencies, even though
1495 * local-fs ones may already be there.
1497 * Note: due to a current limitation (we don't track
1498 * in the dependency "Set*" objects who created a
1499 * dependency), we can only add deps, never lose them,
1500 * until the next full daemon-reload. */
1501 unit_add_dependency_by_name(u
, UNIT_BEFORE
, SPECIAL_REMOTE_FS_TARGET
, NULL
, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
1505 if (u
->load_state
== UNIT_NOT_FOUND
) {
1506 u
->load_state
= UNIT_LOADED
;
1509 /* Load in the extras later on, after we
1510 * finished initialization of the unit */
1512 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1514 flags
->just_changed
= true;
1518 return mount_add_extras(MOUNT(u
));
1523 static int mount_setup_unit(
1527 const char *options
,
1531 _cleanup_free_
char *e
= NULL
;
1532 MountSetupFlags flags
;
1542 /* Ignore API mount points. They should never be referenced in
1543 * dependencies ever. */
1544 if (mount_point_is_api(where
) || mount_point_ignore(where
))
1547 if (streq(fstype
, "autofs"))
1550 /* probably some kind of swap, ignore */
1551 if (!is_path(where
))
1554 r
= unit_name_from_path(where
, ".mount", &e
);
1558 u
= manager_get_unit(m
, e
);
1560 /* First time we see this mount point meaning that it's
1561 * not been initiated by a mount unit but rather by the
1562 * sysadmin having called mount(8) directly. */
1563 r
= unit_new_for_name(m
, sizeof(Mount
), e
, &u
);
1567 r
= mount_setup_new_unit(u
, what
, where
, options
, fstype
, &flags
);
1571 r
= mount_setup_existing_unit(u
, what
, where
, options
, fstype
, &flags
);
1577 MOUNT(u
)->is_mounted
= flags
.is_mounted
;
1578 MOUNT(u
)->just_mounted
= flags
.just_mounted
;
1579 MOUNT(u
)->just_changed
= flags
.just_changed
;
1582 if (flags
.just_changed
)
1583 unit_add_to_dbus_queue(u
);
1587 log_warning_errno(r
, "Failed to set up mount unit: %m");
1591 static int mount_load_proc_self_mountinfo(Manager
*m
, bool set_flags
) {
1592 _cleanup_(mnt_free_tablep
) struct libmnt_table
*t
= NULL
;
1593 _cleanup_(mnt_free_iterp
) struct libmnt_iter
*i
= NULL
;
1598 t
= mnt_new_table();
1599 i
= mnt_new_iter(MNT_ITER_FORWARD
);
1603 r
= mnt_table_parse_mtab(t
, NULL
);
1605 return log_error_errno(r
, "Failed to parse /proc/self/mountinfo: %m");
1609 struct libmnt_fs
*fs
;
1610 const char *device
, *path
, *options
, *fstype
;
1611 _cleanup_free_
char *d
= NULL
, *p
= NULL
;
1614 k
= mnt_table_next_fs(t
, i
, &fs
);
1618 return log_error_errno(k
, "Failed to get next entry from /proc/self/mountinfo: %m");
1620 device
= mnt_fs_get_source(fs
);
1621 path
= mnt_fs_get_target(fs
);
1622 options
= mnt_fs_get_options(fs
);
1623 fstype
= mnt_fs_get_fstype(fs
);
1625 if (!device
|| !path
)
1628 if (cunescape(device
, UNESCAPE_RELAX
, &d
) < 0)
1631 if (cunescape(path
, UNESCAPE_RELAX
, &p
) < 0)
1634 device_found_node(m
, d
, DEVICE_FOUND_MOUNT
, DEVICE_FOUND_MOUNT
);
1636 k
= mount_setup_unit(m
, d
, p
, options
, fstype
, set_flags
);
1637 if (r
== 0 && k
< 0)
1644 static void mount_shutdown(Manager
*m
) {
1647 m
->mount_event_source
= sd_event_source_unref(m
->mount_event_source
);
1649 mnt_unref_monitor(m
->mount_monitor
);
1650 m
->mount_monitor
= NULL
;
1653 static int mount_get_timeout(Unit
*u
, usec_t
*timeout
) {
1654 Mount
*m
= MOUNT(u
);
1658 if (!m
->timer_event_source
)
1661 r
= sd_event_source_get_time(m
->timer_event_source
, &t
);
1664 if (t
== USEC_INFINITY
)
1671 static void mount_enumerate_perpetual(Manager
*m
) {
1677 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1678 * unconditionally synthesize it here and mark it as perpetual. */
1680 u
= manager_get_unit(m
, SPECIAL_ROOT_MOUNT
);
1682 r
= unit_new_for_name(m
, sizeof(Mount
), SPECIAL_ROOT_MOUNT
, &u
);
1684 log_error_errno(r
, "Failed to allocate the special " SPECIAL_ROOT_MOUNT
" unit: %m");
1689 u
->perpetual
= true;
1690 MOUNT(u
)->deserialized_state
= MOUNT_MOUNTED
;
1692 unit_add_to_load_queue(u
);
1693 unit_add_to_dbus_queue(u
);
1696 static bool mount_is_mounted(Mount
*m
) {
1699 return UNIT(m
)->perpetual
|| m
->is_mounted
;
1702 static void mount_enumerate(Manager
*m
) {
1709 if (!m
->mount_monitor
) {
1712 m
->mount_monitor
= mnt_new_monitor();
1713 if (!m
->mount_monitor
) {
1718 r
= mnt_monitor_enable_kernel(m
->mount_monitor
, 1);
1720 log_error_errno(r
, "Failed to enable watching of kernel mount events: %m");
1724 r
= mnt_monitor_enable_userspace(m
->mount_monitor
, 1, NULL
);
1726 log_error_errno(r
, "Failed to enable watching of userspace mount events: %m");
1730 /* mnt_unref_monitor() will close the fd */
1731 fd
= r
= mnt_monitor_get_fd(m
->mount_monitor
);
1733 log_error_errno(r
, "Failed to acquire watch file descriptor: %m");
1737 r
= sd_event_add_io(m
->event
, &m
->mount_event_source
, fd
, EPOLLIN
, mount_dispatch_io
, m
);
1739 log_error_errno(r
, "Failed to watch mount file descriptor: %m");
1743 r
= sd_event_source_set_priority(m
->mount_event_source
, SD_EVENT_PRIORITY_NORMAL
-10);
1745 log_error_errno(r
, "Failed to adjust mount watch priority: %m");
1749 (void) sd_event_source_set_description(m
->mount_event_source
, "mount-monitor-dispatch");
1752 r
= mount_load_proc_self_mountinfo(m
, false);
1762 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
1763 _cleanup_set_free_ Set
*around
= NULL
, *gone
= NULL
;
1764 Manager
*m
= userdata
;
1771 assert(revents
& EPOLLIN
);
1773 if (fd
== mnt_monitor_get_fd(m
->mount_monitor
)) {
1774 bool rescan
= false;
1776 /* Drain all events and verify that the event is valid.
1778 * Note that libmount also monitors /run/mount mkdir if the
1779 * directory does not exist yet. The mkdir may generate event
1780 * which is irrelevant for us.
1782 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1784 r
= mnt_monitor_next_change(m
->mount_monitor
, NULL
, NULL
);
1788 return log_error_errno(r
, "Failed to drain libmount events");
1791 log_debug("libmount event [rescan: %s]", yes_no(rescan
));
1796 r
= mount_load_proc_self_mountinfo(m
, true);
1798 /* Reset flags, just in case, for later calls */
1799 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1800 Mount
*mount
= MOUNT(u
);
1802 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1808 manager_dispatch_load_queue(m
);
1810 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1811 Mount
*mount
= MOUNT(u
);
1813 if (!mount_is_mounted(mount
)) {
1815 /* A mount point is not around right now. It
1816 * might be gone, or might never have
1819 if (mount
->from_proc_self_mountinfo
&&
1820 mount
->parameters_proc_self_mountinfo
.what
) {
1822 /* Remember that this device might just have disappeared */
1823 if (set_ensure_allocated(&gone
, &path_hash_ops
) < 0 ||
1824 set_put(gone
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1825 log_oom(); /* we don't care too much about OOM here... */
1828 mount
->from_proc_self_mountinfo
= false;
1830 switch (mount
->state
) {
1833 /* This has just been unmounted by
1834 * somebody else, follow the state
1836 mount
->result
= MOUNT_SUCCESS
; /* make sure we forget any earlier umount failures */
1837 mount_enter_dead(mount
, MOUNT_SUCCESS
);
1844 } else if (mount
->just_mounted
|| mount
->just_changed
) {
1846 /* A mount point was added or changed */
1848 switch (mount
->state
) {
1853 /* This has just been mounted by somebody else, follow the state change, but let's
1854 * generate a new invocation ID for this implicitly and automatically. */
1855 (void) unit_acquire_invocation_id(UNIT(mount
));
1856 mount_enter_mounted(mount
, MOUNT_SUCCESS
);
1859 case MOUNT_MOUNTING
:
1860 mount_set_state(mount
, MOUNT_MOUNTING_DONE
);
1864 /* Nothing really changed, but let's
1865 * issue an notification call
1866 * nonetheless, in case somebody is
1867 * waiting for this. (e.g. file system
1868 * ro/rw remounts.) */
1869 mount_set_state(mount
, mount
->state
);
1874 if (mount_is_mounted(mount
) &&
1875 mount
->from_proc_self_mountinfo
&&
1876 mount
->parameters_proc_self_mountinfo
.what
) {
1878 if (set_ensure_allocated(&around
, &path_hash_ops
) < 0 ||
1879 set_put(around
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1883 /* Reset the flags for later calls */
1884 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1887 SET_FOREACH(what
, gone
, i
) {
1888 if (set_contains(around
, what
))
1891 /* Let the device units know that the device is no longer mounted */
1892 device_found_node(m
, what
, 0, DEVICE_FOUND_MOUNT
);
1898 static void mount_reset_failed(Unit
*u
) {
1899 Mount
*m
= MOUNT(u
);
1903 if (m
->state
== MOUNT_FAILED
)
1904 mount_set_state(m
, MOUNT_DEAD
);
1906 m
->result
= MOUNT_SUCCESS
;
1907 m
->reload_result
= MOUNT_SUCCESS
;
1910 static int mount_kill(Unit
*u
, KillWho who
, int signo
, sd_bus_error
*error
) {
1911 Mount
*m
= MOUNT(u
);
1915 return unit_kill_common(u
, who
, signo
, -1, MOUNT(u
)->control_pid
, error
);
1918 static int mount_control_pid(Unit
*u
) {
1919 Mount
*m
= MOUNT(u
);
1923 return m
->control_pid
;
1926 static const char* const mount_exec_command_table
[_MOUNT_EXEC_COMMAND_MAX
] = {
1927 [MOUNT_EXEC_MOUNT
] = "ExecMount",
1928 [MOUNT_EXEC_UNMOUNT
] = "ExecUnmount",
1929 [MOUNT_EXEC_REMOUNT
] = "ExecRemount",
1932 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command
, MountExecCommand
);
1934 static const char* const mount_result_table
[_MOUNT_RESULT_MAX
] = {
1935 [MOUNT_SUCCESS
] = "success",
1936 [MOUNT_FAILURE_RESOURCES
] = "resources",
1937 [MOUNT_FAILURE_TIMEOUT
] = "timeout",
1938 [MOUNT_FAILURE_EXIT_CODE
] = "exit-code",
1939 [MOUNT_FAILURE_SIGNAL
] = "signal",
1940 [MOUNT_FAILURE_CORE_DUMP
] = "core-dump",
1941 [MOUNT_FAILURE_START_LIMIT_HIT
] = "start-limit-hit",
1942 [MOUNT_FAILURE_PROTOCOL
] = "protocol",
1945 DEFINE_STRING_TABLE_LOOKUP(mount_result
, MountResult
);
1947 const UnitVTable mount_vtable
= {
1948 .object_size
= sizeof(Mount
),
1949 .exec_context_offset
= offsetof(Mount
, exec_context
),
1950 .cgroup_context_offset
= offsetof(Mount
, cgroup_context
),
1951 .kill_context_offset
= offsetof(Mount
, kill_context
),
1952 .exec_runtime_offset
= offsetof(Mount
, exec_runtime
),
1953 .dynamic_creds_offset
= offsetof(Mount
, dynamic_creds
),
1959 .private_section
= "Mount",
1965 .coldplug
= mount_coldplug
,
1969 .start
= mount_start
,
1971 .reload
= mount_reload
,
1975 .serialize
= mount_serialize
,
1976 .deserialize_item
= mount_deserialize_item
,
1978 .active_state
= mount_active_state
,
1979 .sub_state_to_string
= mount_sub_state_to_string
,
1981 .may_gc
= mount_may_gc
,
1983 .sigchld_event
= mount_sigchld_event
,
1985 .reset_failed
= mount_reset_failed
,
1987 .control_pid
= mount_control_pid
,
1989 .bus_vtable
= bus_mount_vtable
,
1990 .bus_set_property
= bus_mount_set_property
,
1991 .bus_commit_properties
= bus_mount_commit_properties
,
1993 .get_timeout
= mount_get_timeout
,
1995 .can_transient
= true,
1997 .enumerate_perpetual
= mount_enumerate_perpetual
,
1998 .enumerate
= mount_enumerate
,
1999 .shutdown
= mount_shutdown
,
2001 .status_message_formats
= {
2002 .starting_stopping
= {
2003 [0] = "Mounting %s...",
2004 [1] = "Unmounting %s...",
2006 .finished_start_job
= {
2007 [JOB_DONE
] = "Mounted %s.",
2008 [JOB_FAILED
] = "Failed to mount %s.",
2009 [JOB_TIMEOUT
] = "Timed out mounting %s.",
2011 .finished_stop_job
= {
2012 [JOB_DONE
] = "Unmounted %s.",
2013 [JOB_FAILED
] = "Failed unmounting %s.",
2014 [JOB_TIMEOUT
] = "Timed out unmounting %s.",