1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2010 Lennart Poettering
11 #include <sys/epoll.h>
15 #include "sd-messages.h"
17 #include "alloc-util.h"
18 #include "dbus-mount.h"
21 #include "exit-status.h"
22 #include "format-util.h"
23 #include "fstab-util.h"
27 #include "mount-setup.h"
28 #include "mount-util.h"
30 #include "parse-util.h"
31 #include "path-util.h"
32 #include "process-util.h"
34 #include "string-table.h"
35 #include "string-util.h"
37 #include "unit-name.h"
40 #define RETRY_UMOUNT_MAX 32
42 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table
*, mnt_free_table
);
43 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter
*, mnt_free_iter
);
45 static const UnitActiveState state_translation_table
[_MOUNT_STATE_MAX
] = {
46 [MOUNT_DEAD
] = UNIT_INACTIVE
,
47 [MOUNT_MOUNTING
] = UNIT_ACTIVATING
,
48 [MOUNT_MOUNTING_DONE
] = UNIT_ACTIVATING
,
49 [MOUNT_MOUNTED
] = UNIT_ACTIVE
,
50 [MOUNT_REMOUNTING
] = UNIT_RELOADING
,
51 [MOUNT_UNMOUNTING
] = UNIT_DEACTIVATING
,
52 [MOUNT_REMOUNTING_SIGTERM
] = UNIT_RELOADING
,
53 [MOUNT_REMOUNTING_SIGKILL
] = UNIT_RELOADING
,
54 [MOUNT_UNMOUNTING_SIGTERM
] = UNIT_DEACTIVATING
,
55 [MOUNT_UNMOUNTING_SIGKILL
] = UNIT_DEACTIVATING
,
56 [MOUNT_FAILED
] = UNIT_FAILED
59 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
);
60 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
);
62 static bool MOUNT_STATE_WITH_PROCESS(MountState state
) {
67 MOUNT_REMOUNTING_SIGTERM
,
68 MOUNT_REMOUNTING_SIGKILL
,
70 MOUNT_UNMOUNTING_SIGTERM
,
71 MOUNT_UNMOUNTING_SIGKILL
);
74 static bool mount_needs_network(const char *options
, const char *fstype
) {
75 if (fstab_test_option(options
, "_netdev\0"))
78 if (fstype
&& fstype_is_network(fstype
))
84 static bool mount_is_network(const MountParameters
*p
) {
87 return mount_needs_network(p
->options
, p
->fstype
);
90 static bool mount_is_loop(const MountParameters
*p
) {
93 if (fstab_test_option(p
->options
, "loop\0"))
99 static bool mount_is_bind(const MountParameters
*p
) {
102 if (fstab_test_option(p
->options
, "bind\0" "rbind\0"))
105 if (p
->fstype
&& STR_IN_SET(p
->fstype
, "bind", "rbind"))
111 static bool mount_is_auto(const MountParameters
*p
) {
114 return !fstab_test_option(p
->options
, "noauto\0");
117 static bool mount_is_automount(const MountParameters
*p
) {
120 return fstab_test_option(p
->options
,
121 "comment=systemd.automount\0"
122 "x-systemd.automount\0");
125 static bool mount_is_bound_to_device(const Mount
*m
) {
126 const MountParameters
*p
;
128 if (m
->from_fragment
)
131 p
= &m
->parameters_proc_self_mountinfo
;
132 return fstab_test_option(p
->options
, "x-systemd.device-bound\0");
135 static bool needs_quota(const MountParameters
*p
) {
138 /* Quotas are not enabled on network filesystems,
139 * but we want them, for example, on storage connected via iscsi */
140 if (p
->fstype
&& fstype_is_network(p
->fstype
))
143 if (mount_is_bind(p
))
146 return fstab_test_option(p
->options
,
147 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
150 static void mount_init(Unit
*u
) {
154 assert(u
->load_state
== UNIT_STUB
);
156 m
->timeout_usec
= u
->manager
->default_timeout_start_usec
;
158 m
->exec_context
.std_output
= u
->manager
->default_std_output
;
159 m
->exec_context
.std_error
= u
->manager
->default_std_error
;
161 m
->directory_mode
= 0755;
163 /* We need to make sure that /usr/bin/mount is always called
164 * in the same process group as us, so that the autofs kernel
165 * side doesn't send us another mount request while we are
166 * already trying to comply its last one. */
167 m
->exec_context
.same_pgrp
= true;
169 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
171 u
->ignore_on_isolate
= true;
174 static int mount_arm_timer(Mount
*m
, usec_t usec
) {
179 if (m
->timer_event_source
) {
180 r
= sd_event_source_set_time(m
->timer_event_source
, usec
);
184 return sd_event_source_set_enabled(m
->timer_event_source
, SD_EVENT_ONESHOT
);
187 if (usec
== USEC_INFINITY
)
190 r
= sd_event_add_time(
191 UNIT(m
)->manager
->event
,
192 &m
->timer_event_source
,
195 mount_dispatch_timer
, m
);
199 (void) sd_event_source_set_description(m
->timer_event_source
, "mount-timer");
204 static void mount_unwatch_control_pid(Mount
*m
) {
207 if (m
->control_pid
<= 0)
210 unit_unwatch_pid(UNIT(m
), m
->control_pid
);
214 static void mount_parameters_done(MountParameters
*p
) {
221 p
->what
= p
->options
= p
->fstype
= NULL
;
224 static void mount_done(Unit
*u
) {
229 m
->where
= mfree(m
->where
);
231 mount_parameters_done(&m
->parameters_proc_self_mountinfo
);
232 mount_parameters_done(&m
->parameters_fragment
);
234 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
, false);
235 exec_command_done_array(m
->exec_command
, _MOUNT_EXEC_COMMAND_MAX
);
236 m
->control_command
= NULL
;
238 dynamic_creds_unref(&m
->dynamic_creds
);
240 mount_unwatch_control_pid(m
);
242 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
245 _pure_
static MountParameters
* get_mount_parameters_fragment(Mount
*m
) {
248 if (m
->from_fragment
)
249 return &m
->parameters_fragment
;
254 _pure_
static MountParameters
* get_mount_parameters(Mount
*m
) {
257 if (m
->from_proc_self_mountinfo
)
258 return &m
->parameters_proc_self_mountinfo
;
260 return get_mount_parameters_fragment(m
);
263 static int mount_add_mount_dependencies(Mount
*m
) {
272 if (!path_equal(m
->where
, "/")) {
273 _cleanup_free_
char *parent
= NULL
;
275 /* Adds in links to other mount points that might lie further up in the hierarchy */
277 parent
= dirname_malloc(m
->where
);
281 r
= unit_require_mounts_for(UNIT(m
), parent
, UNIT_DEPENDENCY_IMPLICIT
);
286 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
287 * or a loop mount) to be available. */
288 pm
= get_mount_parameters_fragment(m
);
289 if (pm
&& pm
->what
&&
290 path_is_absolute(pm
->what
) &&
291 (mount_is_bind(pm
) || mount_is_loop(pm
) || !mount_is_network(pm
))) {
293 r
= unit_require_mounts_for(UNIT(m
), pm
->what
, UNIT_DEPENDENCY_FILE
);
298 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
299 s
= manager_get_units_requiring_mounts_for(UNIT(m
)->manager
, m
->where
);
300 SET_FOREACH(other
, s
, i
) {
302 if (other
->load_state
!= UNIT_LOADED
)
305 if (other
== UNIT(m
))
308 r
= unit_add_dependency(other
, UNIT_AFTER
, UNIT(m
), true, UNIT_DEPENDENCY_PATH
);
312 if (UNIT(m
)->fragment_path
) {
313 /* If we have fragment configuration, then make this dependency required */
314 r
= unit_add_dependency(other
, UNIT_REQUIRES
, UNIT(m
), true, UNIT_DEPENDENCY_PATH
);
323 static int mount_add_device_dependencies(Mount
*m
) {
324 bool device_wants_mount
= false;
325 UnitDependencyMask mask
;
332 p
= get_mount_parameters(m
);
339 if (mount_is_bind(p
))
342 if (!is_device_path(p
->what
))
345 /* /dev/root is a really weird thing, it's not a real device,
346 * but just a path the kernel exports for the root file system
347 * specified on the kernel command line. Ignore it here. */
348 if (path_equal(p
->what
, "/dev/root"))
351 if (path_equal(m
->where
, "/"))
354 if (mount_is_auto(p
) && !mount_is_automount(p
) && MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
355 device_wants_mount
= true;
357 /* Mount units from /proc/self/mountinfo are not bound to devices
358 * by default since they're subject to races when devices are
359 * unplugged. But the user can still force this dep with an
360 * appropriate option (or udev property) so the mount units are
361 * automatically stopped when the device disappears suddenly. */
362 dep
= mount_is_bound_to_device(m
) ? UNIT_BINDS_TO
: UNIT_REQUIRES
;
364 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
;
366 r
= unit_add_node_dependency(UNIT(m
), p
->what
, device_wants_mount
, dep
, mask
);
373 static int mount_add_quota_dependencies(Mount
*m
) {
374 UnitDependencyMask mask
;
380 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
383 p
= get_mount_parameters_fragment(m
);
390 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
;
392 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTACHECK_SERVICE
, NULL
, true, mask
);
396 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTAON_SERVICE
, NULL
, true, mask
);
403 static bool mount_is_extrinsic(Mount
*m
) {
407 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
408 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
409 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
411 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
)) /* We only automatically manage mounts if we are in system mode */
414 if (PATH_IN_SET(m
->where
, /* Don't bother with the OS data itself */
419 if (PATH_STARTSWITH_SET(m
->where
,
420 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
421 "/proc", /* All of this is API VFS */
422 "/sys", /* … dito … */
423 "/dev")) /* … dito … */
426 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
427 p
= get_mount_parameters(m
);
428 if (p
&& fstab_test_option(p
->options
, "x-initrd.mount\0") && !in_initrd())
434 static int mount_add_default_dependencies(Mount
*m
) {
435 UnitDependencyMask mask
;
442 if (!UNIT(m
)->default_dependencies
)
445 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
446 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
447 * file systems, it's also going to be virtual, and hence not worth the effort. */
448 if (mount_is_extrinsic(m
))
451 p
= get_mount_parameters(m
);
455 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_DEFAULT
;
457 if (mount_is_network(p
)) {
458 /* We order ourselves after network.target. This is
459 * primarily useful at shutdown: services that take
460 * down the network should order themselves before
461 * network.target, so that they are shut down only
462 * after this mount unit is stopped. */
464 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_NETWORK_TARGET
, NULL
, true, mask
);
468 /* We pull in network-online.target, and order
469 * ourselves after it. This is useful at start-up to
470 * actively pull in tools that want to be started
471 * before we start mounting network file systems, and
472 * whose purpose it is to delay this until the network
475 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_WANTS
, UNIT_AFTER
, SPECIAL_NETWORK_ONLINE_TARGET
, NULL
, true, mask
);
479 after
= SPECIAL_REMOTE_FS_PRE_TARGET
;
481 after
= SPECIAL_LOCAL_FS_PRE_TARGET
;
483 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, after
, NULL
, true, mask
);
487 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true, mask
);
491 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
492 if (streq_ptr(p
->fstype
, "tmpfs")) {
493 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_SWAP_TARGET
, NULL
, true, mask
);
501 static int mount_verify(Mount
*m
) {
502 _cleanup_free_
char *e
= NULL
;
508 if (UNIT(m
)->load_state
!= UNIT_LOADED
)
511 if (!m
->from_fragment
&& !m
->from_proc_self_mountinfo
&& !UNIT(m
)->perpetual
)
514 r
= unit_name_from_path(m
->where
, ".mount", &e
);
516 return log_unit_error_errno(UNIT(m
), r
, "Failed to generate unit name from mount path: %m");
518 if (!unit_has_name(UNIT(m
), e
)) {
519 log_unit_error(UNIT(m
), "Where= setting doesn't match unit name. Refusing.");
523 if (mount_point_is_api(m
->where
) || mount_point_ignore(m
->where
)) {
524 log_unit_error(UNIT(m
), "Cannot create mount unit for API file system %s. Refusing.", m
->where
);
528 p
= get_mount_parameters_fragment(m
);
530 log_unit_error(UNIT(m
), "What= setting is missing. Refusing.");
534 if (m
->exec_context
.pam_name
&& m
->kill_context
.kill_mode
!= KILL_CONTROL_GROUP
) {
535 log_unit_error(UNIT(m
), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
542 static int mount_add_extras(Mount
*m
) {
548 if (u
->fragment_path
)
549 m
->from_fragment
= true;
552 r
= unit_name_to_path(u
->id
, &m
->where
);
557 path_simplify(m
->where
, false);
559 if (!u
->description
) {
560 r
= unit_set_description(u
, m
->where
);
565 r
= mount_add_device_dependencies(m
);
569 r
= mount_add_mount_dependencies(m
);
573 r
= mount_add_quota_dependencies(m
);
577 r
= unit_patch_contexts(u
);
581 r
= unit_add_exec_dependencies(u
, &m
->exec_context
);
585 r
= unit_set_default_slice(u
);
589 r
= mount_add_default_dependencies(m
);
596 static int mount_load_root_mount(Unit
*u
) {
599 if (!unit_has_name(u
, SPECIAL_ROOT_MOUNT
))
603 u
->default_dependencies
= false;
605 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
606 MOUNT(u
)->exec_context
.std_output
= EXEC_OUTPUT_NULL
;
607 MOUNT(u
)->exec_context
.std_input
= EXEC_INPUT_NULL
;
610 u
->description
= strdup("Root Mount");
615 static int mount_load(Unit
*u
) {
620 assert(u
->load_state
== UNIT_STUB
);
622 r
= mount_load_root_mount(u
);
626 if (m
->from_proc_self_mountinfo
|| u
->perpetual
)
627 r
= unit_load_fragment_and_dropin_optional(u
);
629 r
= unit_load_fragment_and_dropin(u
);
633 /* This is a new unit? Then let's add in some extras */
634 if (u
->load_state
== UNIT_LOADED
) {
635 r
= mount_add_extras(m
);
640 return mount_verify(m
);
643 static void mount_set_state(Mount
*m
, MountState state
) {
644 MountState old_state
;
647 old_state
= m
->state
;
650 if (!MOUNT_STATE_WITH_PROCESS(state
)) {
651 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
652 mount_unwatch_control_pid(m
);
653 m
->control_command
= NULL
;
654 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
657 if (state
!= old_state
)
658 log_unit_debug(UNIT(m
), "Changed %s -> %s", mount_state_to_string(old_state
), mount_state_to_string(state
));
660 unit_notify(UNIT(m
), state_translation_table
[old_state
], state_translation_table
[state
],
661 m
->reload_result
== MOUNT_SUCCESS
? 0 : UNIT_NOTIFY_RELOAD_FAILURE
);
664 static int mount_coldplug(Unit
*u
) {
666 MountState new_state
= MOUNT_DEAD
;
670 assert(m
->state
== MOUNT_DEAD
);
672 if (m
->deserialized_state
!= m
->state
)
673 new_state
= m
->deserialized_state
;
674 else if (m
->from_proc_self_mountinfo
)
675 new_state
= MOUNT_MOUNTED
;
677 if (new_state
== m
->state
)
680 if (m
->control_pid
> 0 &&
681 pid_is_unwaited(m
->control_pid
) &&
682 MOUNT_STATE_WITH_PROCESS(new_state
)) {
684 r
= unit_watch_pid(UNIT(m
), m
->control_pid
);
688 r
= mount_arm_timer(m
, usec_add(u
->state_change_timestamp
.monotonic
, m
->timeout_usec
));
693 if (!IN_SET(new_state
, MOUNT_DEAD
, MOUNT_FAILED
)) {
694 (void) unit_setup_dynamic_creds(u
);
695 (void) unit_setup_exec_runtime(u
);
698 mount_set_state(m
, new_state
);
702 static void mount_dump(Unit
*u
, FILE *f
, const char *prefix
) {
703 char buf
[FORMAT_TIMESPAN_MAX
];
710 p
= get_mount_parameters(m
);
713 "%sMount State: %s\n"
717 "%sFile System Type: %s\n"
719 "%sFrom /proc/self/mountinfo: %s\n"
720 "%sFrom fragment: %s\n"
722 "%sDirectoryMode: %04o\n"
723 "%sSloppyOptions: %s\n"
724 "%sLazyUnmount: %s\n"
725 "%sForceUnmount: %s\n"
727 prefix
, mount_state_to_string(m
->state
),
728 prefix
, mount_result_to_string(m
->result
),
730 prefix
, p
? strna(p
->what
) : "n/a",
731 prefix
, p
? strna(p
->fstype
) : "n/a",
732 prefix
, p
? strna(p
->options
) : "n/a",
733 prefix
, yes_no(m
->from_proc_self_mountinfo
),
734 prefix
, yes_no(m
->from_fragment
),
735 prefix
, yes_no(mount_is_extrinsic(m
)),
736 prefix
, m
->directory_mode
,
737 prefix
, yes_no(m
->sloppy_options
),
738 prefix
, yes_no(m
->lazy_unmount
),
739 prefix
, yes_no(m
->force_unmount
),
740 prefix
, format_timespan(buf
, sizeof(buf
), m
->timeout_usec
, USEC_PER_SEC
));
742 if (m
->control_pid
> 0)
744 "%sControl PID: "PID_FMT
"\n",
745 prefix
, m
->control_pid
);
747 exec_context_dump(&m
->exec_context
, f
, prefix
);
748 kill_context_dump(&m
->kill_context
, f
, prefix
);
749 cgroup_context_dump(&m
->cgroup_context
, f
, prefix
);
752 static int mount_spawn(Mount
*m
, ExecCommand
*c
, pid_t
*_pid
) {
754 ExecParameters exec_params
= {
755 .flags
= EXEC_APPLY_SANDBOXING
|EXEC_APPLY_CHROOT
|EXEC_APPLY_TTY_STDIN
,
767 r
= unit_prepare_exec(UNIT(m
));
771 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
775 unit_set_exec_params(UNIT(m
), &exec_params
);
777 r
= exec_spawn(UNIT(m
),
787 r
= unit_watch_pid(UNIT(m
), pid
);
789 /* FIXME: we need to do something here */
797 static void mount_enter_dead(Mount
*m
, MountResult f
) {
800 if (m
->result
== MOUNT_SUCCESS
)
803 if (m
->result
!= MOUNT_SUCCESS
)
804 log_unit_warning(UNIT(m
), "Failed with result '%s'.", mount_result_to_string(m
->result
));
806 mount_set_state(m
, m
->result
!= MOUNT_SUCCESS
? MOUNT_FAILED
: MOUNT_DEAD
);
808 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
, true);
810 exec_context_destroy_runtime_directory(&m
->exec_context
, UNIT(m
)->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
812 unit_unref_uid_gid(UNIT(m
), true);
814 dynamic_creds_destroy(&m
->dynamic_creds
);
817 static void mount_enter_mounted(Mount
*m
, MountResult f
) {
820 if (m
->result
== MOUNT_SUCCESS
)
823 mount_set_state(m
, MOUNT_MOUNTED
);
826 static void mount_enter_dead_or_mounted(Mount
*m
, MountResult f
) {
829 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
830 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
831 * ultimately we just mirror the kernel's internal state on this. */
833 if (m
->from_proc_self_mountinfo
)
834 mount_enter_mounted(m
, f
);
836 mount_enter_dead(m
, f
);
839 static int state_to_kill_operation(MountState state
) {
842 case MOUNT_REMOUNTING_SIGTERM
:
843 case MOUNT_UNMOUNTING_SIGTERM
:
844 return KILL_TERMINATE
;
846 case MOUNT_REMOUNTING_SIGKILL
:
847 case MOUNT_UNMOUNTING_SIGKILL
:
851 return _KILL_OPERATION_INVALID
;
855 static void mount_enter_signal(Mount
*m
, MountState state
, MountResult f
) {
860 if (m
->result
== MOUNT_SUCCESS
)
863 r
= unit_kill_context(
866 state_to_kill_operation(state
),
874 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
878 mount_set_state(m
, state
);
879 } else if (state
== MOUNT_REMOUNTING_SIGTERM
&& m
->kill_context
.send_sigkill
)
880 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
881 else if (IN_SET(state
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_REMOUNTING_SIGKILL
))
882 mount_enter_mounted(m
, MOUNT_SUCCESS
);
883 else if (state
== MOUNT_UNMOUNTING_SIGTERM
&& m
->kill_context
.send_sigkill
)
884 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
886 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
891 log_unit_warning_errno(UNIT(m
), r
, "Failed to kill processes: %m");
892 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
895 static void mount_enter_unmounting(Mount
*m
) {
900 /* Start counting our attempts */
901 if (!IN_SET(m
->state
,
903 MOUNT_UNMOUNTING_SIGTERM
,
904 MOUNT_UNMOUNTING_SIGKILL
))
905 m
->n_retry_umount
= 0;
907 m
->control_command_id
= MOUNT_EXEC_UNMOUNT
;
908 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_UNMOUNT
;
910 r
= exec_command_set(m
->control_command
, UMOUNT_PATH
, m
->where
, "-c", NULL
);
911 if (r
>= 0 && m
->lazy_unmount
)
912 r
= exec_command_append(m
->control_command
, "-l", NULL
);
913 if (r
>= 0 && m
->force_unmount
)
914 r
= exec_command_append(m
->control_command
, "-f", NULL
);
918 mount_unwatch_control_pid(m
);
920 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
924 mount_set_state(m
, MOUNT_UNMOUNTING
);
929 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'umount' task: %m");
930 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
933 static void mount_enter_mounting(Mount
*m
) {
939 r
= unit_fail_if_noncanonical(UNIT(m
), m
->where
);
943 (void) mkdir_p_label(m
->where
, m
->directory_mode
);
945 unit_warn_if_dir_nonempty(UNIT(m
), m
->where
);
947 unit_warn_leftover_processes(UNIT(m
));
949 m
->control_command_id
= MOUNT_EXEC_MOUNT
;
950 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_MOUNT
;
952 /* Create the source directory for bind-mounts if needed */
953 p
= get_mount_parameters_fragment(m
);
954 if (p
&& mount_is_bind(p
))
955 (void) mkdir_p_label(p
->what
, m
->directory_mode
);
958 _cleanup_free_
char *opts
= NULL
;
960 r
= fstab_filter_options(p
->options
, "nofail\0" "noauto\0" "auto\0", NULL
, NULL
, &opts
);
964 r
= exec_command_set(m
->control_command
, MOUNT_PATH
, p
->what
, m
->where
, NULL
);
965 if (r
>= 0 && m
->sloppy_options
)
966 r
= exec_command_append(m
->control_command
, "-s", NULL
);
967 if (r
>= 0 && p
->fstype
)
968 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
969 if (r
>= 0 && !isempty(opts
))
970 r
= exec_command_append(m
->control_command
, "-o", opts
, NULL
);
976 mount_unwatch_control_pid(m
);
978 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
982 mount_set_state(m
, MOUNT_MOUNTING
);
987 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'mount' task: %m");
988 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
991 static void mount_set_reload_result(Mount
*m
, MountResult result
) {
994 /* Only store the first error we encounter */
995 if (m
->reload_result
!= MOUNT_SUCCESS
)
998 m
->reload_result
= result
;
1001 static void mount_enter_remounting(Mount
*m
) {
1007 /* Reset reload result when we are about to start a new remount operation */
1008 m
->reload_result
= MOUNT_SUCCESS
;
1010 m
->control_command_id
= MOUNT_EXEC_REMOUNT
;
1011 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_REMOUNT
;
1013 p
= get_mount_parameters_fragment(m
);
1018 o
= strjoina("remount,", p
->options
);
1022 r
= exec_command_set(m
->control_command
, MOUNT_PATH
,
1025 if (r
>= 0 && m
->sloppy_options
)
1026 r
= exec_command_append(m
->control_command
, "-s", NULL
);
1027 if (r
>= 0 && p
->fstype
)
1028 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
1034 mount_unwatch_control_pid(m
);
1036 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
1040 mount_set_state(m
, MOUNT_REMOUNTING
);
1045 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'remount' task: %m");
1046 mount_set_reload_result(m
, MOUNT_FAILURE_RESOURCES
);
1047 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1050 static int mount_start(Unit
*u
) {
1051 Mount
*m
= MOUNT(u
);
1056 /* We cannot fulfill this request right now, try again later
1058 if (IN_SET(m
->state
,
1060 MOUNT_UNMOUNTING_SIGTERM
,
1061 MOUNT_UNMOUNTING_SIGKILL
))
1064 /* Already on it! */
1065 if (m
->state
== MOUNT_MOUNTING
)
1068 assert(IN_SET(m
->state
, MOUNT_DEAD
, MOUNT_FAILED
));
1070 r
= unit_start_limit_test(u
);
1072 mount_enter_dead(m
, MOUNT_FAILURE_START_LIMIT_HIT
);
1076 r
= unit_acquire_invocation_id(u
);
1080 m
->result
= MOUNT_SUCCESS
;
1081 m
->reload_result
= MOUNT_SUCCESS
;
1083 u
->reset_accounting
= true;
1085 mount_enter_mounting(m
);
1089 static int mount_stop(Unit
*u
) {
1090 Mount
*m
= MOUNT(u
);
1096 case MOUNT_UNMOUNTING
:
1097 case MOUNT_UNMOUNTING_SIGKILL
:
1098 case MOUNT_UNMOUNTING_SIGTERM
:
1102 case MOUNT_MOUNTING
:
1103 case MOUNT_MOUNTING_DONE
:
1104 case MOUNT_REMOUNTING
:
1105 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1106 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_SUCCESS
);
1109 case MOUNT_REMOUNTING_SIGTERM
:
1110 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1111 mount_set_state(m
, MOUNT_UNMOUNTING_SIGTERM
);
1114 case MOUNT_REMOUNTING_SIGKILL
:
1116 mount_set_state(m
, MOUNT_UNMOUNTING_SIGKILL
);
1120 mount_enter_unmounting(m
);
1124 assert_not_reached("Unexpected state.");
1128 static int mount_reload(Unit
*u
) {
1129 Mount
*m
= MOUNT(u
);
1132 assert(m
->state
== MOUNT_MOUNTED
);
1134 mount_enter_remounting(m
);
1139 static int mount_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
1140 Mount
*m
= MOUNT(u
);
1146 unit_serialize_item(u
, f
, "state", mount_state_to_string(m
->state
));
1147 unit_serialize_item(u
, f
, "result", mount_result_to_string(m
->result
));
1148 unit_serialize_item(u
, f
, "reload-result", mount_result_to_string(m
->reload_result
));
1150 if (m
->control_pid
> 0)
1151 unit_serialize_item_format(u
, f
, "control-pid", PID_FMT
, m
->control_pid
);
1153 if (m
->control_command_id
>= 0)
1154 unit_serialize_item(u
, f
, "control-command", mount_exec_command_to_string(m
->control_command_id
));
1159 static int mount_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
1160 Mount
*m
= MOUNT(u
);
1167 if (streq(key
, "state")) {
1170 if ((state
= mount_state_from_string(value
)) < 0)
1171 log_unit_debug(u
, "Failed to parse state value: %s", value
);
1173 m
->deserialized_state
= state
;
1174 } else if (streq(key
, "result")) {
1177 f
= mount_result_from_string(value
);
1179 log_unit_debug(u
, "Failed to parse result value: %s", value
);
1180 else if (f
!= MOUNT_SUCCESS
)
1183 } else if (streq(key
, "reload-result")) {
1186 f
= mount_result_from_string(value
);
1188 log_unit_debug(u
, "Failed to parse reload result value: %s", value
);
1189 else if (f
!= MOUNT_SUCCESS
)
1190 m
->reload_result
= f
;
1192 } else if (streq(key
, "control-pid")) {
1195 if (parse_pid(value
, &pid
) < 0)
1196 log_unit_debug(u
, "Failed to parse control-pid value: %s", value
);
1198 m
->control_pid
= pid
;
1199 } else if (streq(key
, "control-command")) {
1200 MountExecCommand id
;
1202 id
= mount_exec_command_from_string(value
);
1204 log_unit_debug(u
, "Failed to parse exec-command value: %s", value
);
1206 m
->control_command_id
= id
;
1207 m
->control_command
= m
->exec_command
+ id
;
1210 log_unit_debug(u
, "Unknown serialization key: %s", key
);
1215 _pure_
static UnitActiveState
mount_active_state(Unit
*u
) {
1218 return state_translation_table
[MOUNT(u
)->state
];
1221 _pure_
static const char *mount_sub_state_to_string(Unit
*u
) {
1224 return mount_state_to_string(MOUNT(u
)->state
);
1227 _pure_
static bool mount_may_gc(Unit
*u
) {
1228 Mount
*m
= MOUNT(u
);
1232 if (m
->from_proc_self_mountinfo
)
1238 static void mount_sigchld_event(Unit
*u
, pid_t pid
, int code
, int status
) {
1239 Mount
*m
= MOUNT(u
);
1245 if (pid
!= m
->control_pid
)
1250 if (is_clean_exit(code
, status
, EXIT_CLEAN_COMMAND
, NULL
))
1252 else if (code
== CLD_EXITED
)
1253 f
= MOUNT_FAILURE_EXIT_CODE
;
1254 else if (code
== CLD_KILLED
)
1255 f
= MOUNT_FAILURE_SIGNAL
;
1256 else if (code
== CLD_DUMPED
)
1257 f
= MOUNT_FAILURE_CORE_DUMP
;
1259 assert_not_reached("Unknown code");
1261 if (IN_SET(m
->state
, MOUNT_REMOUNTING
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_REMOUNTING_SIGTERM
))
1262 mount_set_reload_result(m
, f
);
1263 else if (m
->result
== MOUNT_SUCCESS
)
1266 if (m
->control_command
) {
1267 exec_status_exit(&m
->control_command
->exec_status
, &m
->exec_context
, pid
, code
, status
);
1269 m
->control_command
= NULL
;
1270 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
1273 log_unit_full(u
, f
== MOUNT_SUCCESS
? LOG_DEBUG
: LOG_NOTICE
, 0,
1274 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code
), status
);
1276 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1277 * before we process the SIGCHLD for the mount command. */
1281 case MOUNT_MOUNTING
:
1282 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1284 if (f
== MOUNT_SUCCESS
) {
1285 /* Either /bin/mount has an unexpected definition of success,
1286 * or someone raced us and we lost. */
1287 log_unit_warning(UNIT(m
), "Mount process finished, but there is no mount.");
1288 f
= MOUNT_FAILURE_PROTOCOL
;
1290 mount_enter_dead(m
, f
);
1293 case MOUNT_MOUNTING_DONE
:
1294 mount_enter_mounted(m
, f
);
1297 case MOUNT_REMOUNTING
:
1298 case MOUNT_REMOUNTING_SIGTERM
:
1299 case MOUNT_REMOUNTING_SIGKILL
:
1300 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1303 case MOUNT_UNMOUNTING
:
1305 if (f
== MOUNT_SUCCESS
&& m
->from_proc_self_mountinfo
) {
1307 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1308 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1309 * but we will stop as soon as any one umount times out. */
1311 if (m
->n_retry_umount
< RETRY_UMOUNT_MAX
) {
1312 log_unit_debug(u
, "Mount still present, trying again.");
1313 m
->n_retry_umount
++;
1314 mount_enter_unmounting(m
);
1316 log_unit_warning(u
, "Mount still present after %u attempts to unmount, giving up.", m
->n_retry_umount
);
1317 mount_enter_mounted(m
, f
);
1320 mount_enter_dead_or_mounted(m
, f
);
1324 case MOUNT_UNMOUNTING_SIGKILL
:
1325 case MOUNT_UNMOUNTING_SIGTERM
:
1326 mount_enter_dead_or_mounted(m
, f
);
1330 assert_not_reached("Uh, control process died at wrong time.");
1333 /* Notify clients about changed exit status */
1334 unit_add_to_dbus_queue(u
);
1337 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
1338 Mount
*m
= MOUNT(userdata
);
1341 assert(m
->timer_event_source
== source
);
1345 case MOUNT_MOUNTING
:
1346 case MOUNT_MOUNTING_DONE
:
1347 log_unit_warning(UNIT(m
), "Mounting timed out. Terminating.");
1348 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1351 case MOUNT_REMOUNTING
:
1352 log_unit_warning(UNIT(m
), "Remounting timed out. Terminating remount process.");
1353 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1354 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_SUCCESS
);
1357 case MOUNT_REMOUNTING_SIGTERM
:
1358 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1360 if (m
->kill_context
.send_sigkill
) {
1361 log_unit_warning(UNIT(m
), "Remounting timed out. Killing.");
1362 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
1364 log_unit_warning(UNIT(m
), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1365 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1369 case MOUNT_REMOUNTING_SIGKILL
:
1370 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1372 log_unit_warning(UNIT(m
), "Mount process still around after SIGKILL. Ignoring.");
1373 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1376 case MOUNT_UNMOUNTING
:
1377 log_unit_warning(UNIT(m
), "Unmounting timed out. Terminating.");
1378 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1381 case MOUNT_UNMOUNTING_SIGTERM
:
1382 if (m
->kill_context
.send_sigkill
) {
1383 log_unit_warning(UNIT(m
), "Mount process timed out. Killing.");
1384 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1386 log_unit_warning(UNIT(m
), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1387 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1391 case MOUNT_UNMOUNTING_SIGKILL
:
1392 log_unit_warning(UNIT(m
), "Mount process still around after SIGKILL. Ignoring.");
1393 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1397 assert_not_reached("Timeout at wrong time.");
1409 static int mount_setup_new_unit(
1413 const char *options
,
1415 MountSetupFlags
*flags
) {
1422 u
->source_path
= strdup("/proc/self/mountinfo");
1423 MOUNT(u
)->where
= strdup(where
);
1424 if (!u
->source_path
|| !MOUNT(u
)->where
)
1427 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1428 MOUNT(u
)->from_proc_self_mountinfo
= true;
1429 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1431 p
->what
= strdup(what
);
1432 p
->options
= strdup(options
);
1433 p
->fstype
= strdup(fstype
);
1434 if (!p
->what
|| !p
->options
|| !p
->fstype
)
1437 if (!mount_is_extrinsic(MOUNT(u
))) {
1441 target
= mount_is_network(p
) ? SPECIAL_REMOTE_FS_TARGET
: SPECIAL_LOCAL_FS_TARGET
;
1442 r
= unit_add_dependency_by_name(u
, UNIT_BEFORE
, target
, NULL
, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
1446 r
= unit_add_dependency_by_name(u
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
1451 unit_add_to_load_queue(u
);
1452 flags
->is_mounted
= true;
1453 flags
->just_mounted
= true;
1454 flags
->just_changed
= true;
1459 static int mount_setup_existing_unit(
1463 const char *options
,
1465 MountSetupFlags
*flags
) {
1468 bool load_extras
= false;
1474 if (!MOUNT(u
)->where
) {
1475 MOUNT(u
)->where
= strdup(where
);
1476 if (!MOUNT(u
)->where
)
1480 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1481 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1483 r1
= free_and_strdup(&p
->what
, what
);
1484 r2
= free_and_strdup(&p
->options
, options
);
1485 r3
= free_and_strdup(&p
->fstype
, fstype
);
1486 if (r1
< 0 || r2
< 0 || r3
< 0)
1489 flags
->just_changed
= r1
> 0 || r2
> 0 || r3
> 0;
1490 flags
->is_mounted
= true;
1491 flags
->just_mounted
= !MOUNT(u
)->from_proc_self_mountinfo
|| MOUNT(u
)->just_mounted
;
1493 MOUNT(u
)->from_proc_self_mountinfo
= true;
1495 if (!mount_is_extrinsic(MOUNT(u
)) && mount_is_network(p
)) {
1496 /* _netdev option may have shown up late, or on a
1497 * remount. Add remote-fs dependencies, even though
1498 * local-fs ones may already be there.
1500 * Note: due to a current limitation (we don't track
1501 * in the dependency "Set*" objects who created a
1502 * dependency), we can only add deps, never lose them,
1503 * until the next full daemon-reload. */
1504 unit_add_dependency_by_name(u
, UNIT_BEFORE
, SPECIAL_REMOTE_FS_TARGET
, NULL
, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
1508 if (u
->load_state
== UNIT_NOT_FOUND
) {
1509 u
->load_state
= UNIT_LOADED
;
1512 /* Load in the extras later on, after we
1513 * finished initialization of the unit */
1515 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1517 flags
->just_changed
= true;
1521 return mount_add_extras(MOUNT(u
));
1526 static int mount_setup_unit(
1530 const char *options
,
1534 _cleanup_free_
char *e
= NULL
;
1535 MountSetupFlags flags
;
1545 /* Ignore API mount points. They should never be referenced in
1546 * dependencies ever. */
1547 if (mount_point_is_api(where
) || mount_point_ignore(where
))
1550 if (streq(fstype
, "autofs"))
1553 /* probably some kind of swap, ignore */
1554 if (!is_path(where
))
1557 r
= unit_name_from_path(where
, ".mount", &e
);
1561 u
= manager_get_unit(m
, e
);
1563 /* First time we see this mount point meaning that it's
1564 * not been initiated by a mount unit but rather by the
1565 * sysadmin having called mount(8) directly. */
1566 r
= unit_new_for_name(m
, sizeof(Mount
), e
, &u
);
1570 r
= mount_setup_new_unit(u
, what
, where
, options
, fstype
, &flags
);
1574 r
= mount_setup_existing_unit(u
, what
, where
, options
, fstype
, &flags
);
1580 MOUNT(u
)->is_mounted
= flags
.is_mounted
;
1581 MOUNT(u
)->just_mounted
= flags
.just_mounted
;
1582 MOUNT(u
)->just_changed
= flags
.just_changed
;
1585 if (flags
.just_changed
)
1586 unit_add_to_dbus_queue(u
);
1590 log_warning_errno(r
, "Failed to set up mount unit: %m");
1594 static int mount_load_proc_self_mountinfo(Manager
*m
, bool set_flags
) {
1595 _cleanup_(mnt_free_tablep
) struct libmnt_table
*t
= NULL
;
1596 _cleanup_(mnt_free_iterp
) struct libmnt_iter
*i
= NULL
;
1601 t
= mnt_new_table();
1602 i
= mnt_new_iter(MNT_ITER_FORWARD
);
1606 r
= mnt_table_parse_mtab(t
, NULL
);
1608 return log_error_errno(r
, "Failed to parse /proc/self/mountinfo: %m");
1612 struct libmnt_fs
*fs
;
1613 const char *device
, *path
, *options
, *fstype
;
1614 _cleanup_free_
char *d
= NULL
, *p
= NULL
;
1617 k
= mnt_table_next_fs(t
, i
, &fs
);
1621 return log_error_errno(k
, "Failed to get next entry from /proc/self/mountinfo: %m");
1623 device
= mnt_fs_get_source(fs
);
1624 path
= mnt_fs_get_target(fs
);
1625 options
= mnt_fs_get_options(fs
);
1626 fstype
= mnt_fs_get_fstype(fs
);
1628 if (!device
|| !path
)
1631 if (cunescape(device
, UNESCAPE_RELAX
, &d
) < 0)
1634 if (cunescape(path
, UNESCAPE_RELAX
, &p
) < 0)
1637 device_found_node(m
, d
, DEVICE_FOUND_MOUNT
, DEVICE_FOUND_MOUNT
);
1639 k
= mount_setup_unit(m
, d
, p
, options
, fstype
, set_flags
);
1640 if (r
== 0 && k
< 0)
1647 static void mount_shutdown(Manager
*m
) {
1650 m
->mount_event_source
= sd_event_source_unref(m
->mount_event_source
);
1652 mnt_unref_monitor(m
->mount_monitor
);
1653 m
->mount_monitor
= NULL
;
1656 static int mount_get_timeout(Unit
*u
, usec_t
*timeout
) {
1657 Mount
*m
= MOUNT(u
);
1661 if (!m
->timer_event_source
)
1664 r
= sd_event_source_get_time(m
->timer_event_source
, &t
);
1667 if (t
== USEC_INFINITY
)
1674 static void mount_enumerate_perpetual(Manager
*m
) {
1680 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1681 * unconditionally synthesize it here and mark it as perpetual. */
1683 u
= manager_get_unit(m
, SPECIAL_ROOT_MOUNT
);
1685 r
= unit_new_for_name(m
, sizeof(Mount
), SPECIAL_ROOT_MOUNT
, &u
);
1687 log_error_errno(r
, "Failed to allocate the special " SPECIAL_ROOT_MOUNT
" unit: %m");
1692 u
->perpetual
= true;
1693 MOUNT(u
)->deserialized_state
= MOUNT_MOUNTED
;
1695 unit_add_to_load_queue(u
);
1696 unit_add_to_dbus_queue(u
);
1699 static bool mount_is_mounted(Mount
*m
) {
1702 return UNIT(m
)->perpetual
|| m
->is_mounted
;
1705 static void mount_enumerate(Manager
*m
) {
1712 if (!m
->mount_monitor
) {
1715 m
->mount_monitor
= mnt_new_monitor();
1716 if (!m
->mount_monitor
) {
1721 r
= mnt_monitor_enable_kernel(m
->mount_monitor
, 1);
1723 log_error_errno(r
, "Failed to enable watching of kernel mount events: %m");
1727 r
= mnt_monitor_enable_userspace(m
->mount_monitor
, 1, NULL
);
1729 log_error_errno(r
, "Failed to enable watching of userspace mount events: %m");
1733 /* mnt_unref_monitor() will close the fd */
1734 fd
= r
= mnt_monitor_get_fd(m
->mount_monitor
);
1736 log_error_errno(r
, "Failed to acquire watch file descriptor: %m");
1740 r
= sd_event_add_io(m
->event
, &m
->mount_event_source
, fd
, EPOLLIN
, mount_dispatch_io
, m
);
1742 log_error_errno(r
, "Failed to watch mount file descriptor: %m");
1746 r
= sd_event_source_set_priority(m
->mount_event_source
, SD_EVENT_PRIORITY_NORMAL
-10);
1748 log_error_errno(r
, "Failed to adjust mount watch priority: %m");
1752 (void) sd_event_source_set_description(m
->mount_event_source
, "mount-monitor-dispatch");
1755 r
= mount_load_proc_self_mountinfo(m
, false);
1765 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
1766 _cleanup_set_free_ Set
*around
= NULL
, *gone
= NULL
;
1767 Manager
*m
= userdata
;
1774 assert(revents
& EPOLLIN
);
1776 if (fd
== mnt_monitor_get_fd(m
->mount_monitor
)) {
1777 bool rescan
= false;
1779 /* Drain all events and verify that the event is valid.
1781 * Note that libmount also monitors /run/mount mkdir if the
1782 * directory does not exist yet. The mkdir may generate event
1783 * which is irrelevant for us.
1785 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1787 r
= mnt_monitor_next_change(m
->mount_monitor
, NULL
, NULL
);
1791 return log_error_errno(r
, "Failed to drain libmount events");
1794 log_debug("libmount event [rescan: %s]", yes_no(rescan
));
1799 r
= mount_load_proc_self_mountinfo(m
, true);
1801 /* Reset flags, just in case, for later calls */
1802 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1803 Mount
*mount
= MOUNT(u
);
1805 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1811 manager_dispatch_load_queue(m
);
1813 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1814 Mount
*mount
= MOUNT(u
);
1816 if (!mount_is_mounted(mount
)) {
1818 /* A mount point is not around right now. It
1819 * might be gone, or might never have
1822 if (mount
->from_proc_self_mountinfo
&&
1823 mount
->parameters_proc_self_mountinfo
.what
) {
1825 /* Remember that this device might just have disappeared */
1826 if (set_ensure_allocated(&gone
, &path_hash_ops
) < 0 ||
1827 set_put(gone
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1828 log_oom(); /* we don't care too much about OOM here... */
1831 mount
->from_proc_self_mountinfo
= false;
1833 switch (mount
->state
) {
1836 /* This has just been unmounted by
1837 * somebody else, follow the state
1839 mount
->result
= MOUNT_SUCCESS
; /* make sure we forget any earlier umount failures */
1840 mount_enter_dead(mount
, MOUNT_SUCCESS
);
1847 } else if (mount
->just_mounted
|| mount
->just_changed
) {
1849 /* A mount point was added or changed */
1851 switch (mount
->state
) {
1856 /* This has just been mounted by somebody else, follow the state change, but let's
1857 * generate a new invocation ID for this implicitly and automatically. */
1858 (void) unit_acquire_invocation_id(UNIT(mount
));
1859 mount_enter_mounted(mount
, MOUNT_SUCCESS
);
1862 case MOUNT_MOUNTING
:
1863 mount_set_state(mount
, MOUNT_MOUNTING_DONE
);
1867 /* Nothing really changed, but let's
1868 * issue an notification call
1869 * nonetheless, in case somebody is
1870 * waiting for this. (e.g. file system
1871 * ro/rw remounts.) */
1872 mount_set_state(mount
, mount
->state
);
1877 if (mount_is_mounted(mount
) &&
1878 mount
->from_proc_self_mountinfo
&&
1879 mount
->parameters_proc_self_mountinfo
.what
) {
1881 if (set_ensure_allocated(&around
, &path_hash_ops
) < 0 ||
1882 set_put(around
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1886 /* Reset the flags for later calls */
1887 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1890 SET_FOREACH(what
, gone
, i
) {
1891 if (set_contains(around
, what
))
1894 /* Let the device units know that the device is no longer mounted */
1895 device_found_node(m
, what
, 0, DEVICE_FOUND_MOUNT
);
1901 static void mount_reset_failed(Unit
*u
) {
1902 Mount
*m
= MOUNT(u
);
1906 if (m
->state
== MOUNT_FAILED
)
1907 mount_set_state(m
, MOUNT_DEAD
);
1909 m
->result
= MOUNT_SUCCESS
;
1910 m
->reload_result
= MOUNT_SUCCESS
;
1913 static int mount_kill(Unit
*u
, KillWho who
, int signo
, sd_bus_error
*error
) {
1914 Mount
*m
= MOUNT(u
);
1918 return unit_kill_common(u
, who
, signo
, -1, MOUNT(u
)->control_pid
, error
);
1921 static int mount_control_pid(Unit
*u
) {
1922 Mount
*m
= MOUNT(u
);
1926 return m
->control_pid
;
1929 static const char* const mount_exec_command_table
[_MOUNT_EXEC_COMMAND_MAX
] = {
1930 [MOUNT_EXEC_MOUNT
] = "ExecMount",
1931 [MOUNT_EXEC_UNMOUNT
] = "ExecUnmount",
1932 [MOUNT_EXEC_REMOUNT
] = "ExecRemount",
1935 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command
, MountExecCommand
);
1937 static const char* const mount_result_table
[_MOUNT_RESULT_MAX
] = {
1938 [MOUNT_SUCCESS
] = "success",
1939 [MOUNT_FAILURE_RESOURCES
] = "resources",
1940 [MOUNT_FAILURE_TIMEOUT
] = "timeout",
1941 [MOUNT_FAILURE_EXIT_CODE
] = "exit-code",
1942 [MOUNT_FAILURE_SIGNAL
] = "signal",
1943 [MOUNT_FAILURE_CORE_DUMP
] = "core-dump",
1944 [MOUNT_FAILURE_START_LIMIT_HIT
] = "start-limit-hit",
1945 [MOUNT_FAILURE_PROTOCOL
] = "protocol",
1948 DEFINE_STRING_TABLE_LOOKUP(mount_result
, MountResult
);
1950 const UnitVTable mount_vtable
= {
1951 .object_size
= sizeof(Mount
),
1952 .exec_context_offset
= offsetof(Mount
, exec_context
),
1953 .cgroup_context_offset
= offsetof(Mount
, cgroup_context
),
1954 .kill_context_offset
= offsetof(Mount
, kill_context
),
1955 .exec_runtime_offset
= offsetof(Mount
, exec_runtime
),
1956 .dynamic_creds_offset
= offsetof(Mount
, dynamic_creds
),
1962 .private_section
= "Mount",
1968 .coldplug
= mount_coldplug
,
1972 .start
= mount_start
,
1974 .reload
= mount_reload
,
1978 .serialize
= mount_serialize
,
1979 .deserialize_item
= mount_deserialize_item
,
1981 .active_state
= mount_active_state
,
1982 .sub_state_to_string
= mount_sub_state_to_string
,
1984 .may_gc
= mount_may_gc
,
1986 .sigchld_event
= mount_sigchld_event
,
1988 .reset_failed
= mount_reset_failed
,
1990 .control_pid
= mount_control_pid
,
1992 .bus_vtable
= bus_mount_vtable
,
1993 .bus_set_property
= bus_mount_set_property
,
1994 .bus_commit_properties
= bus_mount_commit_properties
,
1996 .get_timeout
= mount_get_timeout
,
1998 .can_transient
= true,
2000 .enumerate_perpetual
= mount_enumerate_perpetual
,
2001 .enumerate
= mount_enumerate
,
2002 .shutdown
= mount_shutdown
,
2004 .status_message_formats
= {
2005 .starting_stopping
= {
2006 [0] = "Mounting %s...",
2007 [1] = "Unmounting %s...",
2009 .finished_start_job
= {
2010 [JOB_DONE
] = "Mounted %s.",
2011 [JOB_FAILED
] = "Failed to mount %s.",
2012 [JOB_TIMEOUT
] = "Timed out mounting %s.",
2014 .finished_stop_job
= {
2015 [JOB_DONE
] = "Unmounted %s.",
2016 [JOB_FAILED
] = "Failed unmounting %s.",
2017 [JOB_TIMEOUT
] = "Timed out unmounting %s.",