1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
8 #include "sd-messages.h"
10 #include "alloc-util.h"
11 #include "dbus-mount.h"
12 #include "dbus-unit.h"
14 #include "exit-status.h"
15 #include "format-util.h"
16 #include "fstab-util.h"
17 #include "libmount-util.h"
21 #include "mount-setup.h"
23 #include "mountpoint-util.h"
24 #include "parse-util.h"
25 #include "path-util.h"
26 #include "process-util.h"
27 #include "serialize.h"
29 #include "string-table.h"
30 #include "string-util.h"
32 #include "unit-name.h"
35 #define RETRY_UMOUNT_MAX 32
37 static const UnitActiveState state_translation_table
[_MOUNT_STATE_MAX
] = {
38 [MOUNT_DEAD
] = UNIT_INACTIVE
,
39 [MOUNT_MOUNTING
] = UNIT_ACTIVATING
,
40 [MOUNT_MOUNTING_DONE
] = UNIT_ACTIVATING
,
41 [MOUNT_MOUNTED
] = UNIT_ACTIVE
,
42 [MOUNT_REMOUNTING
] = UNIT_RELOADING
,
43 [MOUNT_UNMOUNTING
] = UNIT_DEACTIVATING
,
44 [MOUNT_REMOUNTING_SIGTERM
] = UNIT_RELOADING
,
45 [MOUNT_REMOUNTING_SIGKILL
] = UNIT_RELOADING
,
46 [MOUNT_UNMOUNTING_SIGTERM
] = UNIT_DEACTIVATING
,
47 [MOUNT_UNMOUNTING_SIGKILL
] = UNIT_DEACTIVATING
,
48 [MOUNT_FAILED
] = UNIT_FAILED
,
49 [MOUNT_CLEANING
] = UNIT_MAINTENANCE
,
52 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
);
53 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
);
54 static int mount_process_proc_self_mountinfo(Manager
*m
);
56 static bool MOUNT_STATE_WITH_PROCESS(MountState state
) {
61 MOUNT_REMOUNTING_SIGTERM
,
62 MOUNT_REMOUNTING_SIGKILL
,
64 MOUNT_UNMOUNTING_SIGTERM
,
65 MOUNT_UNMOUNTING_SIGKILL
,
69 static MountParameters
* get_mount_parameters_fragment(Mount
*m
) {
73 return &m
->parameters_fragment
;
78 static MountParameters
* get_mount_parameters(Mount
*m
) {
81 if (m
->from_proc_self_mountinfo
)
82 return &m
->parameters_proc_self_mountinfo
;
84 return get_mount_parameters_fragment(m
);
87 static bool mount_is_automount(const MountParameters
*p
) {
90 return fstab_test_option(p
->options
,
91 "comment=systemd.automount\0"
92 "x-systemd.automount\0");
95 static bool mount_is_network(const MountParameters
*p
) {
98 if (fstab_test_option(p
->options
, "_netdev\0"))
101 if (p
->fstype
&& fstype_is_network(p
->fstype
))
107 static bool mount_is_nofail(const Mount
*m
) {
110 if (!m
->from_fragment
)
113 return fstab_test_yes_no_option(m
->parameters_fragment
.options
, "nofail\0" "fail\0");
116 static bool mount_is_loop(const MountParameters
*p
) {
119 if (fstab_test_option(p
->options
, "loop\0"))
125 static bool mount_is_bind(const MountParameters
*p
) {
128 if (fstab_test_option(p
->options
, "bind\0" "rbind\0"))
131 if (p
->fstype
&& STR_IN_SET(p
->fstype
, "bind", "rbind"))
137 static bool mount_is_bound_to_device(Mount
*m
) {
138 const MountParameters
*p
;
142 /* Determines whether to place a Requires= or BindsTo= dependency on the backing device unit. We do
143 * this by checking for the x-systemd.device-bound mount option. Iff it is set we use BindsTo=,
144 * otherwise Requires=. But note that we might combine the latter with StopPropagatedFrom=, see
147 p
= get_mount_parameters(m
);
151 return fstab_test_option(p
->options
, "x-systemd.device-bound\0");
154 static bool mount_propagate_stop(Mount
*m
) {
157 if (mount_is_bound_to_device(m
)) /* If we are using BindsTo= the stop propagation is implicit, no need to bother */
160 return m
->from_fragment
; /* let's propagate stop whenever this is an explicitly configured unit,
161 * otherwise let's not bother. */
164 static bool mount_needs_quota(const MountParameters
*p
) {
167 /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via
168 * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */
169 if (p
->fstype
&& fstype_is_network(p
->fstype
))
172 if (mount_is_bind(p
))
175 return fstab_test_option(p
->options
,
176 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
179 static void mount_init(Unit
*u
) {
183 assert(u
->load_state
== UNIT_STUB
);
185 m
->timeout_usec
= u
->manager
->default_timeout_start_usec
;
187 m
->exec_context
.std_output
= u
->manager
->default_std_output
;
188 m
->exec_context
.std_error
= u
->manager
->default_std_error
;
190 m
->directory_mode
= 0755;
192 /* We need to make sure that /usr/bin/mount is always called
193 * in the same process group as us, so that the autofs kernel
194 * side doesn't send us another mount request while we are
195 * already trying to comply its last one. */
196 m
->exec_context
.same_pgrp
= true;
198 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
200 u
->ignore_on_isolate
= true;
203 static int mount_arm_timer(Mount
*m
, usec_t usec
) {
208 if (m
->timer_event_source
) {
209 r
= sd_event_source_set_time(m
->timer_event_source
, usec
);
213 return sd_event_source_set_enabled(m
->timer_event_source
, SD_EVENT_ONESHOT
);
216 if (usec
== USEC_INFINITY
)
219 r
= sd_event_add_time(
220 UNIT(m
)->manager
->event
,
221 &m
->timer_event_source
,
224 mount_dispatch_timer
, m
);
228 (void) sd_event_source_set_description(m
->timer_event_source
, "mount-timer");
233 static void mount_unwatch_control_pid(Mount
*m
) {
236 if (m
->control_pid
<= 0)
239 unit_unwatch_pid(UNIT(m
), m
->control_pid
);
243 static void mount_parameters_done(MountParameters
*p
) {
246 p
->what
= mfree(p
->what
);
247 p
->options
= mfree(p
->options
);
248 p
->fstype
= mfree(p
->fstype
);
251 static void mount_done(Unit
*u
) {
256 m
->where
= mfree(m
->where
);
258 mount_parameters_done(&m
->parameters_proc_self_mountinfo
);
259 mount_parameters_done(&m
->parameters_fragment
);
261 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
, false);
262 exec_command_done_array(m
->exec_command
, _MOUNT_EXEC_COMMAND_MAX
);
263 m
->control_command
= NULL
;
265 dynamic_creds_unref(&m
->dynamic_creds
);
267 mount_unwatch_control_pid(m
);
269 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
272 static int update_parameters_proc_self_mountinfo(
276 const char *fstype
) {
281 p
= &m
->parameters_proc_self_mountinfo
;
283 r
= free_and_strdup(&p
->what
, what
);
287 q
= free_and_strdup(&p
->options
, options
);
291 w
= free_and_strdup(&p
->fstype
, fstype
);
295 return r
> 0 || q
> 0 || w
> 0;
298 static int mount_add_mount_dependencies(Mount
*m
) {
306 if (!path_equal(m
->where
, "/")) {
307 _cleanup_free_
char *parent
= NULL
;
309 /* Adds in links to other mount points that might lie further up in the hierarchy */
311 parent
= dirname_malloc(m
->where
);
315 r
= unit_require_mounts_for(UNIT(m
), parent
, UNIT_DEPENDENCY_IMPLICIT
);
320 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
321 * or a loop mount) to be available. */
322 pm
= get_mount_parameters_fragment(m
);
323 if (pm
&& pm
->what
&&
324 path_is_absolute(pm
->what
) &&
325 (mount_is_bind(pm
) || mount_is_loop(pm
) || !mount_is_network(pm
))) {
327 r
= unit_require_mounts_for(UNIT(m
), pm
->what
, UNIT_DEPENDENCY_FILE
);
332 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
333 s
= manager_get_units_requiring_mounts_for(UNIT(m
)->manager
, m
->where
);
334 SET_FOREACH(other
, s
) {
336 if (other
->load_state
!= UNIT_LOADED
)
339 if (other
== UNIT(m
))
342 r
= unit_add_dependency(other
, UNIT_AFTER
, UNIT(m
), true, UNIT_DEPENDENCY_PATH
);
346 if (UNIT(m
)->fragment_path
) {
347 /* If we have fragment configuration, then make this dependency required */
348 r
= unit_add_dependency(other
, UNIT_REQUIRES
, UNIT(m
), true, UNIT_DEPENDENCY_PATH
);
357 static int mount_add_device_dependencies(Mount
*m
) {
358 UnitDependencyMask mask
;
365 p
= get_mount_parameters(m
);
372 if (mount_is_bind(p
))
375 if (!is_device_path(p
->what
))
378 /* /dev/root is a really weird thing, it's not a real device, but just a path the kernel exports for
379 * the root file system specified on the kernel command line. Ignore it here. */
380 if (PATH_IN_SET(p
->what
, "/dev/root", "/dev/nfs"))
383 if (path_equal(m
->where
, "/"))
386 /* Mount units from /proc/self/mountinfo are not bound to devices by default since they're subject to
387 * races when mounts are established by other tools with different backing devices than what we
388 * maintain. The user can still force this to be a BindsTo= dependency with an appropriate option (or
389 * udev property) so the mount units are automatically stopped when the device disappears
391 dep
= mount_is_bound_to_device(m
) ? UNIT_BINDS_TO
: UNIT_REQUIRES
;
393 /* We always use 'what' from /proc/self/mountinfo if mounted */
394 mask
= m
->from_proc_self_mountinfo
? UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
396 r
= unit_add_node_dependency(UNIT(m
), p
->what
, dep
, mask
);
399 if (mount_propagate_stop(m
)) {
400 r
= unit_add_node_dependency(UNIT(m
), p
->what
, UNIT_STOP_PROPAGATED_FROM
, mask
);
405 return unit_add_blockdev_dependency(UNIT(m
), p
->what
, mask
);
408 static int mount_add_quota_dependencies(Mount
*m
) {
409 UnitDependencyMask mask
;
415 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
418 p
= get_mount_parameters_fragment(m
);
422 if (!mount_needs_quota(p
))
425 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
;
427 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTACHECK_SERVICE
, true, mask
);
431 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTAON_SERVICE
, true, mask
);
438 static bool mount_is_extrinsic(Unit
*u
) {
443 /* Returns true for all units that are "magic" and should be excluded from the usual
444 * start-up and shutdown dependencies. We call them "extrinsic" here, as they are generally
445 * mounted outside of the systemd dependency logic. We shouldn't attempt to manage them
446 * ourselves but it's fine if the user operates on them with us. */
448 /* We only automatically manage mounts if we are in system mode */
449 if (MANAGER_IS_USER(u
->manager
))
452 p
= get_mount_parameters(m
);
453 if (p
&& fstab_is_extrinsic(m
->where
, p
->options
))
459 static int mount_add_default_ordering_dependencies(
462 UnitDependencyMask mask
) {
464 const char *after
, *before
, *e
;
469 e
= path_startswith(m
->where
, "/sysroot");
470 if (e
&& in_initrd()) {
471 /* All mounts under /sysroot need to happen later, at initrd-fs.target time. IOW,
472 * it's not technically part of the basic initrd filesystem itself, and so
473 * shouldn't inherit the default Before=local-fs.target dependency. */
476 before
= isempty(e
) ? SPECIAL_INITRD_ROOT_FS_TARGET
: SPECIAL_INITRD_FS_TARGET
;
478 } else if (mount_is_network(p
)) {
479 after
= SPECIAL_REMOTE_FS_PRE_TARGET
;
480 before
= SPECIAL_REMOTE_FS_TARGET
;
483 after
= SPECIAL_LOCAL_FS_PRE_TARGET
;
484 before
= SPECIAL_LOCAL_FS_TARGET
;
487 if (!mount_is_nofail(m
) && !mount_is_automount(p
)) {
488 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_BEFORE
, before
, true, mask
);
494 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, after
, true, mask
);
499 return unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_CONFLICTS
,
500 SPECIAL_UMOUNT_TARGET
, true, mask
);
503 static int mount_add_default_dependencies(Mount
*m
) {
504 UnitDependencyMask mask
;
510 if (!UNIT(m
)->default_dependencies
)
513 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are
514 * guaranteed to stay mounted the whole time, since our system is on it. Also, don't
515 * bother with anything mounted below virtual file systems, it's also going to be virtual,
516 * and hence not worth the effort. */
517 if (mount_is_extrinsic(UNIT(m
)))
520 p
= get_mount_parameters(m
);
524 mask
= m
->from_fragment
? UNIT_DEPENDENCY_FILE
: UNIT_DEPENDENCY_MOUNTINFO_DEFAULT
;
526 r
= mount_add_default_ordering_dependencies(m
, p
, mask
);
530 if (mount_is_network(p
)) {
531 /* We order ourselves after network.target. This is primarily useful at shutdown:
532 * services that take down the network should order themselves before
533 * network.target, so that they are shut down only after this mount unit is
536 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_NETWORK_TARGET
, true, mask
);
540 /* We pull in network-online.target, and order ourselves after it. This is useful
541 * at start-up to actively pull in tools that want to be started before we start
542 * mounting network file systems, and whose purpose it is to delay this until the
543 * network is "up". */
545 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_WANTS
, UNIT_AFTER
, SPECIAL_NETWORK_ONLINE_TARGET
, true, mask
);
550 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
551 if (streq_ptr(p
->fstype
, "tmpfs")) {
552 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_SWAP_TARGET
, true, mask
);
560 static int mount_verify(Mount
*m
) {
561 _cleanup_free_
char *e
= NULL
;
566 assert(UNIT(m
)->load_state
== UNIT_LOADED
);
568 if (!m
->from_fragment
&& !m
->from_proc_self_mountinfo
&& !UNIT(m
)->perpetual
)
571 r
= unit_name_from_path(m
->where
, ".mount", &e
);
573 return log_unit_error_errno(UNIT(m
), r
, "Failed to generate unit name from mount path: %m");
575 if (!unit_has_name(UNIT(m
), e
))
576 return log_unit_error_errno(UNIT(m
), SYNTHETIC_ERRNO(ENOEXEC
), "Where= setting doesn't match unit name. Refusing.");
578 if (mount_point_is_api(m
->where
) || mount_point_ignore(m
->where
))
579 return log_unit_error_errno(UNIT(m
), SYNTHETIC_ERRNO(ENOEXEC
), "Cannot create mount unit for API file system %s. Refusing.", m
->where
);
581 p
= get_mount_parameters_fragment(m
);
582 if (p
&& !p
->what
&& !UNIT(m
)->perpetual
)
583 return log_unit_error_errno(UNIT(m
), SYNTHETIC_ERRNO(ENOEXEC
),
584 "What= setting is missing. Refusing.");
586 if (m
->exec_context
.pam_name
&& m
->kill_context
.kill_mode
!= KILL_CONTROL_GROUP
)
587 return log_unit_error_errno(UNIT(m
), SYNTHETIC_ERRNO(ENOEXEC
), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
592 static int mount_add_non_exec_dependencies(Mount
*m
) {
596 /* Adds in all dependencies directly responsible for ordering the mount, as opposed to dependencies
597 * resulting from the ExecContext and such. */
599 r
= mount_add_device_dependencies(m
);
603 r
= mount_add_mount_dependencies(m
);
607 r
= mount_add_quota_dependencies(m
);
611 r
= mount_add_default_dependencies(m
);
618 static int mount_add_extras(Mount
*m
) {
624 /* Note: this call might be called after we already have been loaded once (and even when it has already been
625 * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
626 * to run with an already set up unit. */
628 if (u
->fragment_path
)
629 m
->from_fragment
= true;
632 r
= unit_name_to_path(u
->id
, &m
->where
);
637 path_simplify(m
->where
);
639 if (!u
->description
) {
640 r
= unit_set_description(u
, m
->where
);
645 r
= unit_patch_contexts(u
);
649 r
= unit_add_exec_dependencies(u
, &m
->exec_context
);
653 r
= unit_set_default_slice(u
);
657 r
= mount_add_non_exec_dependencies(m
);
664 static void mount_load_root_mount(Unit
*u
) {
667 if (!unit_has_name(u
, SPECIAL_ROOT_MOUNT
))
671 u
->default_dependencies
= false;
673 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
674 MOUNT(u
)->exec_context
.std_output
= EXEC_OUTPUT_NULL
;
675 MOUNT(u
)->exec_context
.std_input
= EXEC_INPUT_NULL
;
678 u
->description
= strdup("Root Mount");
681 static int mount_load(Unit
*u
) {
686 assert(u
->load_state
== UNIT_STUB
);
688 mount_load_root_mount(u
);
690 bool fragment_optional
= m
->from_proc_self_mountinfo
|| u
->perpetual
;
691 r
= unit_load_fragment_and_dropin(u
, !fragment_optional
);
693 /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the
694 * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus
695 * we need to update the state in our unit to track it. After all, consider that we don't allow changing the
696 * 'slice' field for a unit once it is active. */
697 if (u
->load_state
== UNIT_LOADED
|| m
->from_proc_self_mountinfo
|| u
->perpetual
)
698 q
= mount_add_extras(m
);
704 if (u
->load_state
!= UNIT_LOADED
)
707 return mount_verify(m
);
710 static void mount_set_state(Mount
*m
, MountState state
) {
711 MountState old_state
;
714 if (m
->state
!= state
)
715 bus_unit_send_pending_change_signal(UNIT(m
), false);
717 old_state
= m
->state
;
720 if (!MOUNT_STATE_WITH_PROCESS(state
)) {
721 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
722 mount_unwatch_control_pid(m
);
723 m
->control_command
= NULL
;
724 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
727 if (state
!= old_state
)
728 log_unit_debug(UNIT(m
), "Changed %s -> %s", mount_state_to_string(old_state
), mount_state_to_string(state
));
730 unit_notify(UNIT(m
), state_translation_table
[old_state
], state_translation_table
[state
],
731 m
->reload_result
== MOUNT_SUCCESS
? 0 : UNIT_NOTIFY_RELOAD_FAILURE
);
734 static int mount_coldplug(Unit
*u
) {
736 MountState new_state
= MOUNT_DEAD
;
740 assert(m
->state
== MOUNT_DEAD
);
742 if (m
->deserialized_state
!= m
->state
)
743 new_state
= m
->deserialized_state
;
744 else if (m
->from_proc_self_mountinfo
)
745 new_state
= MOUNT_MOUNTED
;
747 if (new_state
== m
->state
)
750 if (m
->control_pid
> 0 &&
751 pid_is_unwaited(m
->control_pid
) &&
752 MOUNT_STATE_WITH_PROCESS(new_state
)) {
754 r
= unit_watch_pid(UNIT(m
), m
->control_pid
, false);
758 r
= mount_arm_timer(m
, usec_add(u
->state_change_timestamp
.monotonic
, m
->timeout_usec
));
763 if (!IN_SET(new_state
, MOUNT_DEAD
, MOUNT_FAILED
)) {
764 (void) unit_setup_dynamic_creds(u
);
765 (void) unit_setup_exec_runtime(u
);
768 mount_set_state(m
, new_state
);
772 static void mount_dump(Unit
*u
, FILE *f
, const char *prefix
) {
773 char buf
[FORMAT_TIMESPAN_MAX
];
780 p
= get_mount_parameters(m
);
783 "%sMount State: %s\n"
785 "%sClean Result: %s\n"
788 "%sFile System Type: %s\n"
790 "%sFrom /proc/self/mountinfo: %s\n"
791 "%sFrom fragment: %s\n"
793 "%sDirectoryMode: %04o\n"
794 "%sSloppyOptions: %s\n"
795 "%sLazyUnmount: %s\n"
796 "%sForceUnmount: %s\n"
797 "%sReadWriteOnly: %s\n"
798 "%sTimeoutSec: %s\n",
799 prefix
, mount_state_to_string(m
->state
),
800 prefix
, mount_result_to_string(m
->result
),
801 prefix
, mount_result_to_string(m
->clean_result
),
803 prefix
, p
? strna(p
->what
) : "n/a",
804 prefix
, p
? strna(p
->fstype
) : "n/a",
805 prefix
, p
? strna(p
->options
) : "n/a",
806 prefix
, yes_no(m
->from_proc_self_mountinfo
),
807 prefix
, yes_no(m
->from_fragment
),
808 prefix
, yes_no(mount_is_extrinsic(u
)),
809 prefix
, m
->directory_mode
,
810 prefix
, yes_no(m
->sloppy_options
),
811 prefix
, yes_no(m
->lazy_unmount
),
812 prefix
, yes_no(m
->force_unmount
),
813 prefix
, yes_no(m
->read_write_only
),
814 prefix
, format_timespan(buf
, sizeof(buf
), m
->timeout_usec
, USEC_PER_SEC
));
816 if (m
->control_pid
> 0)
818 "%sControl PID: "PID_FMT
"\n",
819 prefix
, m
->control_pid
);
821 exec_context_dump(&m
->exec_context
, f
, prefix
);
822 kill_context_dump(&m
->kill_context
, f
, prefix
);
823 cgroup_context_dump(UNIT(m
), f
, prefix
);
826 static int mount_spawn(Mount
*m
, ExecCommand
*c
, pid_t
*_pid
) {
828 _cleanup_(exec_params_clear
) ExecParameters exec_params
= {
829 .flags
= EXEC_APPLY_SANDBOXING
|EXEC_APPLY_CHROOT
|EXEC_APPLY_TTY_STDIN
,
842 r
= unit_prepare_exec(UNIT(m
));
846 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
850 r
= unit_set_exec_params(UNIT(m
), &exec_params
);
854 r
= exec_spawn(UNIT(m
),
864 r
= unit_watch_pid(UNIT(m
), pid
, true);
873 static void mount_enter_dead(Mount
*m
, MountResult f
) {
876 if (m
->result
== MOUNT_SUCCESS
)
879 unit_log_result(UNIT(m
), m
->result
== MOUNT_SUCCESS
, mount_result_to_string(m
->result
));
880 unit_warn_leftover_processes(UNIT(m
), unit_log_leftover_process_stop
);
882 mount_set_state(m
, m
->result
!= MOUNT_SUCCESS
? MOUNT_FAILED
: MOUNT_DEAD
);
884 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
, true);
886 unit_destroy_runtime_data(UNIT(m
), &m
->exec_context
);
888 unit_unref_uid_gid(UNIT(m
), true);
890 dynamic_creds_destroy(&m
->dynamic_creds
);
892 /* Any dependencies based on /proc/self/mountinfo are now stale */
893 unit_remove_dependencies(UNIT(m
), UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
896 static void mount_enter_mounted(Mount
*m
, MountResult f
) {
899 if (m
->result
== MOUNT_SUCCESS
)
902 mount_set_state(m
, MOUNT_MOUNTED
);
905 static void mount_enter_dead_or_mounted(Mount
*m
, MountResult f
) {
908 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
909 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
910 * ultimately we just mirror the kernel's internal state on this. */
912 if (m
->from_proc_self_mountinfo
)
913 mount_enter_mounted(m
, f
);
915 mount_enter_dead(m
, f
);
918 static int state_to_kill_operation(MountState state
) {
921 case MOUNT_REMOUNTING_SIGTERM
:
924 case MOUNT_UNMOUNTING_SIGTERM
:
925 return KILL_TERMINATE
;
927 case MOUNT_REMOUNTING_SIGKILL
:
928 case MOUNT_UNMOUNTING_SIGKILL
:
932 return _KILL_OPERATION_INVALID
;
936 static void mount_enter_signal(Mount
*m
, MountState state
, MountResult f
) {
941 if (m
->result
== MOUNT_SUCCESS
)
944 r
= unit_kill_context(
947 state_to_kill_operation(state
),
955 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
959 mount_set_state(m
, state
);
960 } else if (state
== MOUNT_REMOUNTING_SIGTERM
&& m
->kill_context
.send_sigkill
)
961 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
962 else if (IN_SET(state
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_REMOUNTING_SIGKILL
))
963 mount_enter_mounted(m
, MOUNT_SUCCESS
);
964 else if (state
== MOUNT_UNMOUNTING_SIGTERM
&& m
->kill_context
.send_sigkill
)
965 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
967 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
972 log_unit_warning_errno(UNIT(m
), r
, "Failed to kill processes: %m");
973 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
976 static void mount_enter_unmounting(Mount
*m
) {
981 /* Start counting our attempts */
982 if (!IN_SET(m
->state
,
984 MOUNT_UNMOUNTING_SIGTERM
,
985 MOUNT_UNMOUNTING_SIGKILL
))
986 m
->n_retry_umount
= 0;
988 m
->control_command_id
= MOUNT_EXEC_UNMOUNT
;
989 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_UNMOUNT
;
991 r
= exec_command_set(m
->control_command
, UMOUNT_PATH
, m
->where
, "-c", NULL
);
992 if (r
>= 0 && m
->lazy_unmount
)
993 r
= exec_command_append(m
->control_command
, "-l", NULL
);
994 if (r
>= 0 && m
->force_unmount
)
995 r
= exec_command_append(m
->control_command
, "-f", NULL
);
999 mount_unwatch_control_pid(m
);
1001 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
1005 mount_set_state(m
, MOUNT_UNMOUNTING
);
1010 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'umount' task: %m");
1011 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
1014 static void mount_enter_mounting(Mount
*m
) {
1020 r
= unit_fail_if_noncanonical(UNIT(m
), m
->where
);
1024 (void) mkdir_p_label(m
->where
, m
->directory_mode
);
1026 unit_warn_if_dir_nonempty(UNIT(m
), m
->where
);
1027 unit_warn_leftover_processes(UNIT(m
), unit_log_leftover_process_start
);
1029 m
->control_command_id
= MOUNT_EXEC_MOUNT
;
1030 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_MOUNT
;
1032 /* Create the source directory for bind-mounts if needed */
1033 p
= get_mount_parameters_fragment(m
);
1034 if (p
&& mount_is_bind(p
)) {
1035 r
= mkdir_p_label(p
->what
, m
->directory_mode
);
1036 /* mkdir_p_label() can return -EEXIST if the target path exists and is not a directory - which is
1037 * totally OK, in case the user wants us to overmount a non-directory inode. */
1038 if (r
< 0 && r
!= -EEXIST
)
1039 log_unit_error_errno(UNIT(m
), r
, "Failed to make bind mount source '%s': %m", p
->what
);
1043 _cleanup_free_
char *opts
= NULL
;
1045 r
= fstab_filter_options(p
->options
, "nofail\0" "noauto\0" "auto\0", NULL
, NULL
, NULL
, &opts
);
1049 r
= exec_command_set(m
->control_command
, MOUNT_PATH
, p
->what
, m
->where
, NULL
);
1050 if (r
>= 0 && m
->sloppy_options
)
1051 r
= exec_command_append(m
->control_command
, "-s", NULL
);
1052 if (r
>= 0 && m
->read_write_only
)
1053 r
= exec_command_append(m
->control_command
, "-w", NULL
);
1054 if (r
>= 0 && p
->fstype
)
1055 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
1056 if (r
>= 0 && !isempty(opts
))
1057 r
= exec_command_append(m
->control_command
, "-o", opts
, NULL
);
1063 mount_unwatch_control_pid(m
);
1065 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
1069 mount_set_state(m
, MOUNT_MOUNTING
);
1074 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'mount' task: %m");
1075 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
1078 static void mount_set_reload_result(Mount
*m
, MountResult result
) {
1081 /* Only store the first error we encounter */
1082 if (m
->reload_result
!= MOUNT_SUCCESS
)
1085 m
->reload_result
= result
;
1088 static void mount_enter_remounting(Mount
*m
) {
1094 /* Reset reload result when we are about to start a new remount operation */
1095 m
->reload_result
= MOUNT_SUCCESS
;
1097 m
->control_command_id
= MOUNT_EXEC_REMOUNT
;
1098 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_REMOUNT
;
1100 p
= get_mount_parameters_fragment(m
);
1105 o
= strjoina("remount,", p
->options
);
1109 r
= exec_command_set(m
->control_command
, MOUNT_PATH
,
1112 if (r
>= 0 && m
->sloppy_options
)
1113 r
= exec_command_append(m
->control_command
, "-s", NULL
);
1114 if (r
>= 0 && m
->read_write_only
)
1115 r
= exec_command_append(m
->control_command
, "-w", NULL
);
1116 if (r
>= 0 && p
->fstype
)
1117 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
1123 mount_unwatch_control_pid(m
);
1125 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
1129 mount_set_state(m
, MOUNT_REMOUNTING
);
1134 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'remount' task: %m");
1135 mount_set_reload_result(m
, MOUNT_FAILURE_RESOURCES
);
1136 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1139 static void mount_cycle_clear(Mount
*m
) {
1142 /* Clear all state we shall forget for this new cycle */
1144 m
->result
= MOUNT_SUCCESS
;
1145 m
->reload_result
= MOUNT_SUCCESS
;
1146 exec_command_reset_status_array(m
->exec_command
, _MOUNT_EXEC_COMMAND_MAX
);
1147 UNIT(m
)->reset_accounting
= true;
1150 static int mount_start(Unit
*u
) {
1151 Mount
*m
= MOUNT(u
);
1156 /* We cannot fulfill this request right now, try again later
1158 if (IN_SET(m
->state
,
1160 MOUNT_UNMOUNTING_SIGTERM
,
1161 MOUNT_UNMOUNTING_SIGKILL
,
1165 /* Already on it! */
1166 if (IN_SET(m
->state
, MOUNT_MOUNTING
, MOUNT_MOUNTING_DONE
))
1169 assert(IN_SET(m
->state
, MOUNT_DEAD
, MOUNT_FAILED
));
1171 r
= unit_test_start_limit(u
);
1173 mount_enter_dead(m
, MOUNT_FAILURE_START_LIMIT_HIT
);
1177 r
= unit_acquire_invocation_id(u
);
1181 mount_cycle_clear(m
);
1182 mount_enter_mounting(m
);
1187 static int mount_stop(Unit
*u
) {
1188 Mount
*m
= MOUNT(u
);
1194 case MOUNT_UNMOUNTING
:
1195 case MOUNT_UNMOUNTING_SIGKILL
:
1196 case MOUNT_UNMOUNTING_SIGTERM
:
1200 case MOUNT_MOUNTING
:
1201 case MOUNT_MOUNTING_DONE
:
1202 case MOUNT_REMOUNTING
:
1203 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1204 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_SUCCESS
);
1207 case MOUNT_REMOUNTING_SIGTERM
:
1208 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1209 mount_set_state(m
, MOUNT_UNMOUNTING_SIGTERM
);
1212 case MOUNT_REMOUNTING_SIGKILL
:
1214 mount_set_state(m
, MOUNT_UNMOUNTING_SIGKILL
);
1218 mount_enter_unmounting(m
);
1221 case MOUNT_CLEANING
:
1222 /* If we are currently cleaning, then abort it, brutally. */
1223 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
1227 assert_not_reached("Unexpected state.");
1231 static int mount_reload(Unit
*u
) {
1232 Mount
*m
= MOUNT(u
);
1235 assert(m
->state
== MOUNT_MOUNTED
);
1237 mount_enter_remounting(m
);
1242 static int mount_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
1243 Mount
*m
= MOUNT(u
);
1249 (void) serialize_item(f
, "state", mount_state_to_string(m
->state
));
1250 (void) serialize_item(f
, "result", mount_result_to_string(m
->result
));
1251 (void) serialize_item(f
, "reload-result", mount_result_to_string(m
->reload_result
));
1252 (void) serialize_item_format(f
, "n-retry-umount", "%u", m
->n_retry_umount
);
1254 if (m
->control_pid
> 0)
1255 (void) serialize_item_format(f
, "control-pid", PID_FMT
, m
->control_pid
);
1257 if (m
->control_command_id
>= 0)
1258 (void) serialize_item(f
, "control-command", mount_exec_command_to_string(m
->control_command_id
));
1263 static int mount_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
1264 Mount
*m
= MOUNT(u
);
1272 if (streq(key
, "state")) {
1275 state
= mount_state_from_string(value
);
1277 log_unit_debug_errno(u
, state
, "Failed to parse state value: %s", value
);
1279 m
->deserialized_state
= state
;
1281 } else if (streq(key
, "result")) {
1284 f
= mount_result_from_string(value
);
1286 log_unit_debug_errno(u
, f
, "Failed to parse result value: %s", value
);
1287 else if (f
!= MOUNT_SUCCESS
)
1290 } else if (streq(key
, "reload-result")) {
1293 f
= mount_result_from_string(value
);
1295 log_unit_debug_errno(u
, f
, "Failed to parse reload result value: %s", value
);
1296 else if (f
!= MOUNT_SUCCESS
)
1297 m
->reload_result
= f
;
1299 } else if (streq(key
, "n-retry-umount")) {
1301 r
= safe_atou(value
, &m
->n_retry_umount
);
1303 log_unit_debug_errno(u
, r
, "Failed to parse n-retry-umount value: %s", value
);
1305 } else if (streq(key
, "control-pid")) {
1307 r
= parse_pid(value
, &m
->control_pid
);
1309 log_unit_debug_errno(u
, r
, "Failed to parse control-pid value: %s", value
);
1311 } else if (streq(key
, "control-command")) {
1312 MountExecCommand id
;
1314 id
= mount_exec_command_from_string(value
);
1316 log_unit_debug_errno(u
, id
, "Failed to parse exec-command value: %s", value
);
1318 m
->control_command_id
= id
;
1319 m
->control_command
= m
->exec_command
+ id
;
1322 log_unit_debug(u
, "Unknown serialization key: %s", key
);
1327 _pure_
static UnitActiveState
mount_active_state(Unit
*u
) {
1330 return state_translation_table
[MOUNT(u
)->state
];
1333 _pure_
static const char *mount_sub_state_to_string(Unit
*u
) {
1336 return mount_state_to_string(MOUNT(u
)->state
);
1339 _pure_
static bool mount_may_gc(Unit
*u
) {
1340 Mount
*m
= MOUNT(u
);
1344 if (m
->from_proc_self_mountinfo
)
1350 static void mount_sigchld_event(Unit
*u
, pid_t pid
, int code
, int status
) {
1351 Mount
*m
= MOUNT(u
);
1357 if (pid
!= m
->control_pid
)
1360 /* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether
1361 * they established/remove a mount. This is important when mounting, but even more so when unmounting
1362 * since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat
1363 * the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from
1364 * the mount() or umount() syscalls, and thus we should see the changes to the proc file before we
1365 * process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we
1366 * have to waitid() for processes using P_ALL (since we need to reap unexpected children that got
1367 * reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just
1368 * instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might
1369 * have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for
1370 * processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that
1371 * race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount
1372 * dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see
1373 * /proc/self/mountinfo changes before our mount/umount exits. */
1374 (void) mount_process_proc_self_mountinfo(u
->manager
);
1378 if (is_clean_exit(code
, status
, EXIT_CLEAN_COMMAND
, NULL
))
1380 else if (code
== CLD_EXITED
)
1381 f
= MOUNT_FAILURE_EXIT_CODE
;
1382 else if (code
== CLD_KILLED
)
1383 f
= MOUNT_FAILURE_SIGNAL
;
1384 else if (code
== CLD_DUMPED
)
1385 f
= MOUNT_FAILURE_CORE_DUMP
;
1387 assert_not_reached("Unknown code");
1389 if (IN_SET(m
->state
, MOUNT_REMOUNTING
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_REMOUNTING_SIGTERM
))
1390 mount_set_reload_result(m
, f
);
1391 else if (m
->result
== MOUNT_SUCCESS
)
1394 if (m
->control_command
) {
1395 exec_status_exit(&m
->control_command
->exec_status
, &m
->exec_context
, pid
, code
, status
);
1397 m
->control_command
= NULL
;
1398 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
1401 unit_log_process_exit(
1404 mount_exec_command_to_string(m
->control_command_id
),
1408 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1409 * before we process the SIGCHLD for the mount command. */
1413 case MOUNT_MOUNTING
:
1414 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1416 if (f
== MOUNT_SUCCESS
) {
1417 /* Either /bin/mount has an unexpected definition of success,
1418 * or someone raced us and we lost. */
1419 log_unit_warning(UNIT(m
), "Mount process finished, but there is no mount.");
1420 f
= MOUNT_FAILURE_PROTOCOL
;
1422 mount_enter_dead(m
, f
);
1425 case MOUNT_MOUNTING_DONE
:
1426 mount_enter_mounted(m
, f
);
1429 case MOUNT_REMOUNTING
:
1430 case MOUNT_REMOUNTING_SIGTERM
:
1431 case MOUNT_REMOUNTING_SIGKILL
:
1432 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1435 case MOUNT_UNMOUNTING
:
1437 if (f
== MOUNT_SUCCESS
&& m
->from_proc_self_mountinfo
) {
1439 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1440 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1441 * but we will stop as soon as any one umount times out. */
1443 if (m
->n_retry_umount
< RETRY_UMOUNT_MAX
) {
1444 log_unit_debug(u
, "Mount still present, trying again.");
1445 m
->n_retry_umount
++;
1446 mount_enter_unmounting(m
);
1448 log_unit_warning(u
, "Mount still present after %u attempts to unmount, giving up.", m
->n_retry_umount
);
1449 mount_enter_mounted(m
, f
);
1452 mount_enter_dead_or_mounted(m
, f
);
1456 case MOUNT_UNMOUNTING_SIGKILL
:
1457 case MOUNT_UNMOUNTING_SIGTERM
:
1458 mount_enter_dead_or_mounted(m
, f
);
1461 case MOUNT_CLEANING
:
1462 if (m
->clean_result
== MOUNT_SUCCESS
)
1463 m
->clean_result
= f
;
1465 mount_enter_dead(m
, MOUNT_SUCCESS
);
1469 assert_not_reached("Uh, control process died at wrong time.");
1472 /* Notify clients about changed exit status */
1473 unit_add_to_dbus_queue(u
);
1476 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
1477 Mount
*m
= MOUNT(userdata
);
1480 assert(m
->timer_event_source
== source
);
1484 case MOUNT_MOUNTING
:
1485 case MOUNT_MOUNTING_DONE
:
1486 log_unit_warning(UNIT(m
), "Mounting timed out. Terminating.");
1487 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1490 case MOUNT_REMOUNTING
:
1491 log_unit_warning(UNIT(m
), "Remounting timed out. Terminating remount process.");
1492 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1493 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_SUCCESS
);
1496 case MOUNT_REMOUNTING_SIGTERM
:
1497 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1499 if (m
->kill_context
.send_sigkill
) {
1500 log_unit_warning(UNIT(m
), "Remounting timed out. Killing.");
1501 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
1503 log_unit_warning(UNIT(m
), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1504 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1508 case MOUNT_REMOUNTING_SIGKILL
:
1509 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1511 log_unit_warning(UNIT(m
), "Mount process still around after SIGKILL. Ignoring.");
1512 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1515 case MOUNT_UNMOUNTING
:
1516 log_unit_warning(UNIT(m
), "Unmounting timed out. Terminating.");
1517 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1520 case MOUNT_UNMOUNTING_SIGTERM
:
1521 if (m
->kill_context
.send_sigkill
) {
1522 log_unit_warning(UNIT(m
), "Mount process timed out. Killing.");
1523 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1525 log_unit_warning(UNIT(m
), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1526 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1530 case MOUNT_UNMOUNTING_SIGKILL
:
1531 log_unit_warning(UNIT(m
), "Mount process still around after SIGKILL. Ignoring.");
1532 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1535 case MOUNT_CLEANING
:
1536 log_unit_warning(UNIT(m
), "Cleaning timed out. killing.");
1538 if (m
->clean_result
== MOUNT_SUCCESS
)
1539 m
->clean_result
= MOUNT_FAILURE_TIMEOUT
;
1541 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, 0);
1545 assert_not_reached("Timeout at wrong time.");
1551 static int mount_setup_new_unit(
1556 const char *options
,
1558 MountProcFlags
*ret_flags
,
1561 _cleanup_(unit_freep
) Unit
*u
= NULL
;
1569 r
= unit_new_for_name(m
, sizeof(Mount
), name
, &u
);
1573 r
= free_and_strdup(&u
->source_path
, "/proc/self/mountinfo");
1577 r
= free_and_strdup(&MOUNT(u
)->where
, where
);
1581 r
= update_parameters_proc_self_mountinfo(MOUNT(u
), what
, options
, fstype
);
1585 /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the time we load
1586 * the unit file for it (and thus add in extra deps right after) we know what source to attributes the deps
1588 MOUNT(u
)->from_proc_self_mountinfo
= true;
1590 /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything else is
1592 unit_add_to_load_queue(u
);
1594 *ret_flags
= MOUNT_PROC_IS_MOUNTED
| MOUNT_PROC_JUST_MOUNTED
| MOUNT_PROC_JUST_CHANGED
;
1599 static int mount_setup_existing_unit(
1603 const char *options
,
1605 MountProcFlags
*ret_flags
) {
1612 if (!MOUNT(u
)->where
) {
1613 MOUNT(u
)->where
= strdup(where
);
1614 if (!MOUNT(u
)->where
)
1618 /* In case we have multiple mounts established on the same mount point, let's merge flags set already
1619 * for the current unit. Note that the flags field is reset on each iteration of reading
1620 * /proc/self/mountinfo, hence we know for sure anything already set here is from the current
1621 * iteration and thus worthy of taking into account. */
1622 MountProcFlags flags
=
1623 MOUNT(u
)->proc_flags
| MOUNT_PROC_IS_MOUNTED
;
1625 r
= update_parameters_proc_self_mountinfo(MOUNT(u
), what
, options
, fstype
);
1629 flags
|= MOUNT_PROC_JUST_CHANGED
;
1631 /* There are two conditions when we consider a mount point just mounted: when we haven't seen it in
1632 * /proc/self/mountinfo before or when MOUNT_MOUNTING is our current state. Why bother with the
1633 * latter? Shouldn't that be covered by the former? No, during reload it is not because we might then
1634 * encounter a new /proc/self/mountinfo in combination with an old mount unit state (since it stems
1635 * from the serialized state), and need to catch up. Since we know that the MOUNT_MOUNTING state is
1636 * reached when we wait for the mount to appear we hence can assume that if we are in it, we are
1637 * actually seeing it established for the first time. */
1638 if (!MOUNT(u
)->from_proc_self_mountinfo
|| MOUNT(u
)->state
== MOUNT_MOUNTING
)
1639 flags
|= MOUNT_PROC_JUST_MOUNTED
;
1641 MOUNT(u
)->from_proc_self_mountinfo
= true;
1643 if (IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_BAD_SETTING
, UNIT_ERROR
)) {
1644 /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in
1645 * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */
1646 u
->load_state
= UNIT_LOADED
;
1649 flags
|= MOUNT_PROC_JUST_CHANGED
;
1652 if (FLAGS_SET(flags
, MOUNT_PROC_JUST_CHANGED
)) {
1653 /* If things changed, then make sure that all deps are regenerated. Let's
1654 * first remove all automatic deps, and then add in the new ones. */
1656 unit_remove_dependencies(u
, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
);
1658 r
= mount_add_non_exec_dependencies(MOUNT(u
));
1667 static int mount_setup_unit(
1671 const char *options
,
1675 _cleanup_free_
char *e
= NULL
;
1676 MountProcFlags flags
;
1686 /* Ignore API mount points. They should never be referenced in
1687 * dependencies ever. */
1688 if (mount_point_is_api(where
) || mount_point_ignore(where
))
1691 if (streq(fstype
, "autofs"))
1694 /* probably some kind of swap, ignore */
1695 if (!is_path(where
))
1698 /* Mount unit names have to be (like all other unit names) short enough to fit into file names. This
1699 * means there's a good chance that overly long mount point paths after mangling them to look like a
1700 * unit name would result in unit names we don't actually consider valid. This should be OK however
1701 * as such long mount point paths should not happen on regular systems — and if they appear
1702 * nonetheless they are generally synthesized by software, and thus managed by that other
1703 * software. Having such long names just means you cannot use systemd to manage those specific mount
1704 * points, which should be an OK restriction to make. After all we don't have to be able to manage
1705 * all mount points in the world — as long as we don't choke on them when we encounter them. */
1706 r
= unit_name_from_path(where
, ".mount", &e
);
1708 static RateLimit rate_limit
= { /* Let's log about this at warning level at most once every
1709 * 5s. Given that we generate this whenever we read the file
1710 * otherwise we probably shouldn't flood the logs with
1712 .interval
= 5 * USEC_PER_SEC
,
1716 return log_struct_errno(
1717 ratelimit_below(&rate_limit
) ? LOG_WARNING
: LOG_DEBUG
, r
,
1718 "MESSAGE_ID=" SD_MESSAGE_MOUNT_POINT_PATH_NOT_SUITABLE_STR
,
1719 "MOUNT_POINT=%s", where
,
1720 LOG_MESSAGE("Failed to generate valid unit name from path '%s', ignoring mount point: %m", where
));
1723 u
= manager_get_unit(m
, e
);
1725 r
= mount_setup_existing_unit(u
, what
, where
, options
, fstype
, &flags
);
1727 /* First time we see this mount point meaning that it's not been initiated by a mount unit but rather
1728 * by the sysadmin having called mount(8) directly. */
1729 r
= mount_setup_new_unit(m
, e
, what
, where
, options
, fstype
, &flags
, &u
);
1731 return log_warning_errno(r
, "Failed to set up mount unit for '%s': %m", where
);
1733 /* If the mount changed properties or state, let's notify our clients */
1734 if (flags
& (MOUNT_PROC_JUST_CHANGED
|MOUNT_PROC_JUST_MOUNTED
))
1735 unit_add_to_dbus_queue(u
);
1738 MOUNT(u
)->proc_flags
= flags
;
1743 static int mount_load_proc_self_mountinfo(Manager
*m
, bool set_flags
) {
1744 _cleanup_(mnt_free_tablep
) struct libmnt_table
*table
= NULL
;
1745 _cleanup_(mnt_free_iterp
) struct libmnt_iter
*iter
= NULL
;
1750 r
= libmount_parse(NULL
, NULL
, &table
, &iter
);
1752 return log_error_errno(r
, "Failed to parse /proc/self/mountinfo: %m");
1755 struct libmnt_fs
*fs
;
1756 const char *device
, *path
, *options
, *fstype
;
1758 r
= mnt_table_next_fs(table
, iter
, &fs
);
1762 return log_error_errno(r
, "Failed to get next entry from /proc/self/mountinfo: %m");
1764 device
= mnt_fs_get_source(fs
);
1765 path
= mnt_fs_get_target(fs
);
1766 options
= mnt_fs_get_options(fs
);
1767 fstype
= mnt_fs_get_fstype(fs
);
1769 if (!device
|| !path
)
1772 device_found_node(m
, device
, DEVICE_FOUND_MOUNT
, DEVICE_FOUND_MOUNT
);
1774 (void) mount_setup_unit(m
, device
, path
, options
, fstype
, set_flags
);
1780 static void mount_shutdown(Manager
*m
) {
1783 m
->mount_event_source
= sd_event_source_unref(m
->mount_event_source
);
1785 mnt_unref_monitor(m
->mount_monitor
);
1786 m
->mount_monitor
= NULL
;
1789 static int mount_get_timeout(Unit
*u
, usec_t
*timeout
) {
1790 Mount
*m
= MOUNT(u
);
1794 if (!m
->timer_event_source
)
1797 r
= sd_event_source_get_time(m
->timer_event_source
, &t
);
1800 if (t
== USEC_INFINITY
)
1807 static void mount_enumerate_perpetual(Manager
*m
) {
1813 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1814 * unconditionally synthesize it here and mark it as perpetual. */
1816 u
= manager_get_unit(m
, SPECIAL_ROOT_MOUNT
);
1818 r
= unit_new_for_name(m
, sizeof(Mount
), SPECIAL_ROOT_MOUNT
, &u
);
1820 log_error_errno(r
, "Failed to allocate the special " SPECIAL_ROOT_MOUNT
" unit: %m");
1825 u
->perpetual
= true;
1826 MOUNT(u
)->deserialized_state
= MOUNT_MOUNTED
;
1828 unit_add_to_load_queue(u
);
1829 unit_add_to_dbus_queue(u
);
1832 static bool mount_is_mounted(Mount
*m
) {
1835 return UNIT(m
)->perpetual
|| FLAGS_SET(m
->proc_flags
, MOUNT_PROC_IS_MOUNTED
);
1838 static void mount_enumerate(Manager
*m
) {
1845 if (!m
->mount_monitor
) {
1848 m
->mount_monitor
= mnt_new_monitor();
1849 if (!m
->mount_monitor
) {
1854 r
= mnt_monitor_enable_kernel(m
->mount_monitor
, 1);
1856 log_error_errno(r
, "Failed to enable watching of kernel mount events: %m");
1860 r
= mnt_monitor_enable_userspace(m
->mount_monitor
, 1, NULL
);
1862 log_error_errno(r
, "Failed to enable watching of userspace mount events: %m");
1866 /* mnt_unref_monitor() will close the fd */
1867 fd
= r
= mnt_monitor_get_fd(m
->mount_monitor
);
1869 log_error_errno(r
, "Failed to acquire watch file descriptor: %m");
1873 r
= sd_event_add_io(m
->event
, &m
->mount_event_source
, fd
, EPOLLIN
, mount_dispatch_io
, m
);
1875 log_error_errno(r
, "Failed to watch mount file descriptor: %m");
1879 r
= sd_event_source_set_priority(m
->mount_event_source
, SD_EVENT_PRIORITY_NORMAL
-10);
1881 log_error_errno(r
, "Failed to adjust mount watch priority: %m");
1885 r
= sd_event_source_set_ratelimit(m
->mount_event_source
, 1 * USEC_PER_SEC
, 5);
1887 log_error_errno(r
, "Failed to enable rate limit for mount events: %m");
1891 (void) sd_event_source_set_description(m
->mount_event_source
, "mount-monitor-dispatch");
1894 r
= mount_load_proc_self_mountinfo(m
, false);
1904 static int drain_libmount(Manager
*m
) {
1905 bool rescan
= false;
1910 /* Drain all events and verify that the event is valid.
1912 * Note that libmount also monitors /run/mount mkdir if the directory does not exist yet. The mkdir
1913 * may generate event which is irrelevant for us.
1915 * error: r < 0; valid: r == 0, false positive: r == 1 */
1917 r
= mnt_monitor_next_change(m
->mount_monitor
, NULL
, NULL
);
1919 return log_error_errno(r
, "Failed to drain libmount events: %m");
1927 static int mount_process_proc_self_mountinfo(Manager
*m
) {
1928 _cleanup_set_free_free_ Set
*around
= NULL
, *gone
= NULL
;
1935 r
= drain_libmount(m
);
1939 r
= mount_load_proc_self_mountinfo(m
, true);
1941 /* Reset flags, just in case, for later calls */
1942 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
])
1943 MOUNT(u
)->proc_flags
= 0;
1948 manager_dispatch_load_queue(m
);
1950 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1951 Mount
*mount
= MOUNT(u
);
1953 if (!mount_is_mounted(mount
)) {
1955 /* A mount point is not around right now. It
1956 * might be gone, or might never have
1959 if (mount
->from_proc_self_mountinfo
&&
1960 mount
->parameters_proc_self_mountinfo
.what
) {
1962 /* Remember that this device might just have disappeared */
1963 if (set_ensure_allocated(&gone
, &path_hash_ops
) < 0 ||
1964 set_put_strdup(&gone
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1965 log_oom(); /* we don't care too much about OOM here... */
1968 mount
->from_proc_self_mountinfo
= false;
1969 assert_se(update_parameters_proc_self_mountinfo(mount
, NULL
, NULL
, NULL
) >= 0);
1971 switch (mount
->state
) {
1974 /* This has just been unmounted by somebody else, follow the state change. */
1975 mount_enter_dead(mount
, MOUNT_SUCCESS
);
1978 case MOUNT_MOUNTING_DONE
:
1979 /* The mount command may add the corresponding proc mountinfo entry and
1980 * then remove it because of an internal error. E.g., fuse.sshfs seems
1981 * to do that when the connection fails. See #17617. To handle such the
1982 * case, let's once set the state back to mounting. Then, the unit can
1983 * correctly enter the failed state later in mount_sigchld(). */
1984 mount_set_state(mount
, MOUNT_MOUNTING
);
1991 } else if (mount
->proc_flags
& (MOUNT_PROC_JUST_MOUNTED
|MOUNT_PROC_JUST_CHANGED
)) {
1993 /* A mount point was added or changed */
1995 switch (mount
->state
) {
2000 /* This has just been mounted by somebody else, follow the state change, but let's
2001 * generate a new invocation ID for this implicitly and automatically. */
2002 (void) unit_acquire_invocation_id(u
);
2003 mount_cycle_clear(mount
);
2004 mount_enter_mounted(mount
, MOUNT_SUCCESS
);
2007 case MOUNT_MOUNTING
:
2008 mount_set_state(mount
, MOUNT_MOUNTING_DONE
);
2012 /* Nothing really changed, but let's
2013 * issue an notification call
2014 * nonetheless, in case somebody is
2015 * waiting for this. (e.g. file system
2016 * ro/rw remounts.) */
2017 mount_set_state(mount
, mount
->state
);
2022 if (mount_is_mounted(mount
) &&
2023 mount
->from_proc_self_mountinfo
&&
2024 mount
->parameters_proc_self_mountinfo
.what
) {
2025 /* Track devices currently used */
2027 if (set_ensure_allocated(&around
, &path_hash_ops
) < 0 ||
2028 set_put_strdup(&around
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
2032 /* Reset the flags for later calls */
2033 mount
->proc_flags
= 0;
2036 SET_FOREACH(what
, gone
) {
2037 if (set_contains(around
, what
))
2040 /* Let the device units know that the device is no longer mounted */
2041 device_found_node(m
, what
, 0, DEVICE_FOUND_MOUNT
);
2047 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
2048 Manager
*m
= userdata
;
2051 assert(revents
& EPOLLIN
);
2053 return mount_process_proc_self_mountinfo(m
);
2056 static void mount_reset_failed(Unit
*u
) {
2057 Mount
*m
= MOUNT(u
);
2061 if (m
->state
== MOUNT_FAILED
)
2062 mount_set_state(m
, MOUNT_DEAD
);
2064 m
->result
= MOUNT_SUCCESS
;
2065 m
->reload_result
= MOUNT_SUCCESS
;
2066 m
->clean_result
= MOUNT_SUCCESS
;
2069 static int mount_kill(Unit
*u
, KillWho who
, int signo
, sd_bus_error
*error
) {
2070 Mount
*m
= MOUNT(u
);
2074 return unit_kill_common(u
, who
, signo
, -1, m
->control_pid
, error
);
2077 static int mount_control_pid(Unit
*u
) {
2078 Mount
*m
= MOUNT(u
);
2082 return m
->control_pid
;
2085 static int mount_clean(Unit
*u
, ExecCleanMask mask
) {
2086 _cleanup_strv_free_
char **l
= NULL
;
2087 Mount
*m
= MOUNT(u
);
2093 if (m
->state
!= MOUNT_DEAD
)
2096 r
= exec_context_get_clean_directories(&m
->exec_context
, u
->manager
->prefix
, mask
, &l
);
2100 if (strv_isempty(l
))
2103 mount_unwatch_control_pid(m
);
2104 m
->clean_result
= MOUNT_SUCCESS
;
2105 m
->control_command
= NULL
;
2106 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
2108 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->exec_context
.timeout_clean_usec
));
2112 r
= unit_fork_and_watch_rm_rf(u
, l
, &m
->control_pid
);
2116 mount_set_state(m
, MOUNT_CLEANING
);
2121 log_unit_warning_errno(u
, r
, "Failed to initiate cleaning: %m");
2122 m
->clean_result
= MOUNT_FAILURE_RESOURCES
;
2123 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
2127 static int mount_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
2128 Mount
*m
= MOUNT(u
);
2132 return exec_context_get_clean_mask(&m
->exec_context
, ret
);
2135 static const char* const mount_exec_command_table
[_MOUNT_EXEC_COMMAND_MAX
] = {
2136 [MOUNT_EXEC_MOUNT
] = "ExecMount",
2137 [MOUNT_EXEC_UNMOUNT
] = "ExecUnmount",
2138 [MOUNT_EXEC_REMOUNT
] = "ExecRemount",
2141 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command
, MountExecCommand
);
2143 static const char* const mount_result_table
[_MOUNT_RESULT_MAX
] = {
2144 [MOUNT_SUCCESS
] = "success",
2145 [MOUNT_FAILURE_RESOURCES
] = "resources",
2146 [MOUNT_FAILURE_TIMEOUT
] = "timeout",
2147 [MOUNT_FAILURE_EXIT_CODE
] = "exit-code",
2148 [MOUNT_FAILURE_SIGNAL
] = "signal",
2149 [MOUNT_FAILURE_CORE_DUMP
] = "core-dump",
2150 [MOUNT_FAILURE_START_LIMIT_HIT
] = "start-limit-hit",
2151 [MOUNT_FAILURE_PROTOCOL
] = "protocol",
2154 DEFINE_STRING_TABLE_LOOKUP(mount_result
, MountResult
);
2156 const UnitVTable mount_vtable
= {
2157 .object_size
= sizeof(Mount
),
2158 .exec_context_offset
= offsetof(Mount
, exec_context
),
2159 .cgroup_context_offset
= offsetof(Mount
, cgroup_context
),
2160 .kill_context_offset
= offsetof(Mount
, kill_context
),
2161 .exec_runtime_offset
= offsetof(Mount
, exec_runtime
),
2162 .dynamic_creds_offset
= offsetof(Mount
, dynamic_creds
),
2168 .private_section
= "Mount",
2170 .can_transient
= true,
2177 .coldplug
= mount_coldplug
,
2181 .start
= mount_start
,
2183 .reload
= mount_reload
,
2186 .clean
= mount_clean
,
2187 .can_clean
= mount_can_clean
,
2189 .serialize
= mount_serialize
,
2190 .deserialize_item
= mount_deserialize_item
,
2192 .active_state
= mount_active_state
,
2193 .sub_state_to_string
= mount_sub_state_to_string
,
2195 .will_restart
= unit_will_restart_default
,
2197 .may_gc
= mount_may_gc
,
2198 .is_extrinsic
= mount_is_extrinsic
,
2200 .sigchld_event
= mount_sigchld_event
,
2202 .reset_failed
= mount_reset_failed
,
2204 .control_pid
= mount_control_pid
,
2206 .bus_set_property
= bus_mount_set_property
,
2207 .bus_commit_properties
= bus_mount_commit_properties
,
2209 .get_timeout
= mount_get_timeout
,
2211 .enumerate_perpetual
= mount_enumerate_perpetual
,
2212 .enumerate
= mount_enumerate
,
2213 .shutdown
= mount_shutdown
,
2215 .status_message_formats
= {
2216 .starting_stopping
= {
2217 [0] = "Mounting %s...",
2218 [1] = "Unmounting %s...",
2220 .finished_start_job
= {
2221 [JOB_DONE
] = "Mounted %s.",
2222 [JOB_FAILED
] = "Failed to mount %s.",
2223 [JOB_TIMEOUT
] = "Timed out mounting %s.",
2225 .finished_stop_job
= {
2226 [JOB_DONE
] = "Unmounted %s.",
2227 [JOB_FAILED
] = "Failed unmounting %s.",
2228 [JOB_TIMEOUT
] = "Timed out unmounting %s.",