2 This file is part of systemd.
4 Copyright 2010 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 #include <sys/epoll.h>
25 #include "sd-messages.h"
27 #include "alloc-util.h"
28 #include "dbus-mount.h"
30 #include "exit-status.h"
31 #include "format-util.h"
32 #include "fstab-util.h"
36 #include "mount-setup.h"
37 #include "mount-util.h"
39 #include "parse-util.h"
40 #include "path-util.h"
41 #include "process-util.h"
43 #include "string-table.h"
44 #include "string-util.h"
46 #include "unit-name.h"
49 #define RETRY_UMOUNT_MAX 32
51 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table
*, mnt_free_table
);
52 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter
*, mnt_free_iter
);
54 static const UnitActiveState state_translation_table
[_MOUNT_STATE_MAX
] = {
55 [MOUNT_DEAD
] = UNIT_INACTIVE
,
56 [MOUNT_MOUNTING
] = UNIT_ACTIVATING
,
57 [MOUNT_MOUNTING_DONE
] = UNIT_ACTIVE
,
58 [MOUNT_MOUNTED
] = UNIT_ACTIVE
,
59 [MOUNT_REMOUNTING
] = UNIT_RELOADING
,
60 [MOUNT_UNMOUNTING
] = UNIT_DEACTIVATING
,
61 [MOUNT_MOUNTING_SIGTERM
] = UNIT_DEACTIVATING
,
62 [MOUNT_MOUNTING_SIGKILL
] = UNIT_DEACTIVATING
,
63 [MOUNT_REMOUNTING_SIGTERM
] = UNIT_RELOADING
,
64 [MOUNT_REMOUNTING_SIGKILL
] = UNIT_RELOADING
,
65 [MOUNT_UNMOUNTING_SIGTERM
] = UNIT_DEACTIVATING
,
66 [MOUNT_UNMOUNTING_SIGKILL
] = UNIT_DEACTIVATING
,
67 [MOUNT_FAILED
] = UNIT_FAILED
70 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
);
71 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
);
73 static bool mount_needs_network(const char *options
, const char *fstype
) {
74 if (fstab_test_option(options
, "_netdev\0"))
77 if (fstype
&& fstype_is_network(fstype
))
83 static bool mount_is_network(const MountParameters
*p
) {
86 return mount_needs_network(p
->options
, p
->fstype
);
89 static bool mount_is_loop(const MountParameters
*p
) {
92 if (fstab_test_option(p
->options
, "loop\0"))
98 static bool mount_is_bind(const MountParameters
*p
) {
101 if (fstab_test_option(p
->options
, "bind\0" "rbind\0"))
104 if (p
->fstype
&& STR_IN_SET(p
->fstype
, "bind", "rbind"))
110 static bool mount_is_auto(const MountParameters
*p
) {
113 return !fstab_test_option(p
->options
, "noauto\0");
116 static bool mount_is_automount(const MountParameters
*p
) {
119 return fstab_test_option(p
->options
,
120 "comment=systemd.automount\0"
121 "x-systemd.automount\0");
124 static bool mount_state_active(MountState state
) {
130 MOUNT_MOUNTING_SIGTERM
,
131 MOUNT_MOUNTING_SIGKILL
,
132 MOUNT_UNMOUNTING_SIGTERM
,
133 MOUNT_UNMOUNTING_SIGKILL
,
134 MOUNT_REMOUNTING_SIGTERM
,
135 MOUNT_REMOUNTING_SIGKILL
);
138 static bool mount_is_bound_to_device(const Mount
*m
) {
139 const MountParameters
*p
;
141 if (m
->from_fragment
)
144 p
= &m
->parameters_proc_self_mountinfo
;
145 return fstab_test_option(p
->options
, "x-systemd.device-bound\0");
148 static bool needs_quota(const MountParameters
*p
) {
151 /* Quotas are not enabled on network filesystems,
152 * but we want them, for example, on storage connected via iscsi */
153 if (p
->fstype
&& fstype_is_network(p
->fstype
))
156 if (mount_is_bind(p
))
159 return fstab_test_option(p
->options
,
160 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
163 static void mount_init(Unit
*u
) {
167 assert(u
->load_state
== UNIT_STUB
);
169 m
->timeout_usec
= u
->manager
->default_timeout_start_usec
;
170 m
->directory_mode
= 0755;
172 /* We need to make sure that /usr/bin/mount is always called
173 * in the same process group as us, so that the autofs kernel
174 * side doesn't send us another mount request while we are
175 * already trying to comply its last one. */
176 m
->exec_context
.same_pgrp
= true;
178 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
180 u
->ignore_on_isolate
= true;
183 static int mount_arm_timer(Mount
*m
, usec_t usec
) {
188 if (m
->timer_event_source
) {
189 r
= sd_event_source_set_time(m
->timer_event_source
, usec
);
193 return sd_event_source_set_enabled(m
->timer_event_source
, SD_EVENT_ONESHOT
);
196 if (usec
== USEC_INFINITY
)
199 r
= sd_event_add_time(
200 UNIT(m
)->manager
->event
,
201 &m
->timer_event_source
,
204 mount_dispatch_timer
, m
);
208 (void) sd_event_source_set_description(m
->timer_event_source
, "mount-timer");
213 static void mount_unwatch_control_pid(Mount
*m
) {
216 if (m
->control_pid
<= 0)
219 unit_unwatch_pid(UNIT(m
), m
->control_pid
);
223 static void mount_parameters_done(MountParameters
*p
) {
230 p
->what
= p
->options
= p
->fstype
= NULL
;
233 static void mount_done(Unit
*u
) {
238 m
->where
= mfree(m
->where
);
240 mount_parameters_done(&m
->parameters_proc_self_mountinfo
);
241 mount_parameters_done(&m
->parameters_fragment
);
243 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
);
244 exec_command_done_array(m
->exec_command
, _MOUNT_EXEC_COMMAND_MAX
);
245 m
->control_command
= NULL
;
247 dynamic_creds_unref(&m
->dynamic_creds
);
249 mount_unwatch_control_pid(m
);
251 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
254 _pure_
static MountParameters
* get_mount_parameters_fragment(Mount
*m
) {
257 if (m
->from_fragment
)
258 return &m
->parameters_fragment
;
263 _pure_
static MountParameters
* get_mount_parameters(Mount
*m
) {
266 if (m
->from_proc_self_mountinfo
)
267 return &m
->parameters_proc_self_mountinfo
;
269 return get_mount_parameters_fragment(m
);
272 static int mount_add_mount_links(Mount
*m
) {
273 _cleanup_free_
char *parent
= NULL
;
282 if (!path_equal(m
->where
, "/")) {
283 /* Adds in links to other mount points that might lie further
284 * up in the hierarchy */
286 parent
= dirname_malloc(m
->where
);
290 r
= unit_require_mounts_for(UNIT(m
), parent
);
295 /* Adds in links to other mount points that might be needed
296 * for the source path (if this is a bind mount or a loop mount) to be
298 pm
= get_mount_parameters_fragment(m
);
299 if (pm
&& pm
->what
&&
300 path_is_absolute(pm
->what
) &&
301 (mount_is_bind(pm
) || mount_is_loop(pm
) || !mount_is_network(pm
))) {
303 r
= unit_require_mounts_for(UNIT(m
), pm
->what
);
308 /* Adds in links to other units that use this path or paths
309 * further down in the hierarchy */
310 s
= manager_get_units_requiring_mounts_for(UNIT(m
)->manager
, m
->where
);
311 SET_FOREACH(other
, s
, i
) {
313 if (other
->load_state
!= UNIT_LOADED
)
316 if (other
== UNIT(m
))
319 r
= unit_add_dependency(other
, UNIT_AFTER
, UNIT(m
), true);
323 if (UNIT(m
)->fragment_path
) {
324 /* If we have fragment configuration, then make this dependency required */
325 r
= unit_add_dependency(other
, UNIT_REQUIRES
, UNIT(m
), true);
334 static int mount_add_device_links(Mount
*m
) {
336 bool device_wants_mount
= false;
342 p
= get_mount_parameters(m
);
349 if (mount_is_bind(p
))
352 if (!is_device_path(p
->what
))
355 /* /dev/root is a really weird thing, it's not a real device,
356 * but just a path the kernel exports for the root file system
357 * specified on the kernel command line. Ignore it here. */
358 if (path_equal(p
->what
, "/dev/root"))
361 if (path_equal(m
->where
, "/"))
364 if (mount_is_auto(p
) && !mount_is_automount(p
) && MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
365 device_wants_mount
= true;
367 /* Mount units from /proc/self/mountinfo are not bound to devices
368 * by default since they're subject to races when devices are
369 * unplugged. But the user can still force this dep with an
370 * appropriate option (or udev property) so the mount units are
371 * automatically stopped when the device disappears suddenly. */
372 dep
= mount_is_bound_to_device(m
) ? UNIT_BINDS_TO
: UNIT_REQUIRES
;
374 r
= unit_add_node_link(UNIT(m
), p
->what
, device_wants_mount
, dep
);
381 static int mount_add_quota_links(Mount
*m
) {
387 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
390 p
= get_mount_parameters_fragment(m
);
397 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTACHECK_SERVICE
, NULL
, true);
401 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTAON_SERVICE
, NULL
, true);
408 static bool mount_is_extrinsic(Mount
*m
) {
412 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
413 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
414 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
416 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
)) /* We only automatically manage mounts if we are in system mode */
419 if (PATH_IN_SET(m
->where
, /* Don't bother with the OS data itself */
424 if (PATH_STARTSWITH_SET(m
->where
,
425 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
426 "/proc", /* All of this is API VFS */
427 "/sys", /* … dito … */
428 "/dev")) /* … dito … */
431 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
432 p
= get_mount_parameters(m
);
433 if (p
&& fstab_test_option(p
->options
, "x-initrd.mount\0") && !in_initrd())
439 static int mount_add_default_dependencies(Mount
*m
) {
446 if (!UNIT(m
)->default_dependencies
)
449 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
450 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
451 * file systems, it's also going to be virtual, and hence not worth the effort. */
452 if (mount_is_extrinsic(m
))
455 p
= get_mount_parameters(m
);
459 if (mount_is_network(p
)) {
460 /* We order ourselves after network.target. This is
461 * primarily useful at shutdown: services that take
462 * down the network should order themselves before
463 * network.target, so that they are shut down only
464 * after this mount unit is stopped. */
466 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_NETWORK_TARGET
, NULL
, true);
470 /* We pull in network-online.target, and order
471 * ourselves after it. This is useful at start-up to
472 * actively pull in tools that want to be started
473 * before we start mounting network file systems, and
474 * whose purpose it is to delay this until the network
477 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_WANTS
, UNIT_AFTER
, SPECIAL_NETWORK_ONLINE_TARGET
, NULL
, true);
481 after
= SPECIAL_REMOTE_FS_PRE_TARGET
;
483 after
= SPECIAL_LOCAL_FS_PRE_TARGET
;
485 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, after
, NULL
, true);
489 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true);
496 static int mount_verify(Mount
*m
) {
497 _cleanup_free_
char *e
= NULL
;
503 if (UNIT(m
)->load_state
!= UNIT_LOADED
)
506 if (!m
->from_fragment
&& !m
->from_proc_self_mountinfo
&& !UNIT(m
)->perpetual
)
509 r
= unit_name_from_path(m
->where
, ".mount", &e
);
511 return log_unit_error_errno(UNIT(m
), r
, "Failed to generate unit name from mount path: %m");
513 if (!unit_has_name(UNIT(m
), e
)) {
514 log_unit_error(UNIT(m
), "Where= setting doesn't match unit name. Refusing.");
518 if (mount_point_is_api(m
->where
) || mount_point_ignore(m
->where
)) {
519 log_unit_error(UNIT(m
), "Cannot create mount unit for API file system %s. Refusing.", m
->where
);
523 p
= get_mount_parameters_fragment(m
);
525 log_unit_error(UNIT(m
), "What= setting is missing. Refusing.");
529 if (m
->exec_context
.pam_name
&& m
->kill_context
.kill_mode
!= KILL_CONTROL_GROUP
) {
530 log_unit_error(UNIT(m
), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
537 static int mount_add_extras(Mount
*m
) {
543 if (u
->fragment_path
)
544 m
->from_fragment
= true;
547 r
= unit_name_to_path(u
->id
, &m
->where
);
552 path_kill_slashes(m
->where
);
554 if (!u
->description
) {
555 r
= unit_set_description(u
, m
->where
);
560 r
= mount_add_device_links(m
);
564 r
= mount_add_mount_links(m
);
568 r
= mount_add_quota_links(m
);
572 r
= unit_patch_contexts(u
);
576 r
= unit_add_exec_dependencies(u
, &m
->exec_context
);
580 r
= unit_set_default_slice(u
);
584 r
= mount_add_default_dependencies(m
);
591 static int mount_load_root_mount(Unit
*u
) {
594 if (!unit_has_name(u
, SPECIAL_ROOT_MOUNT
))
598 u
->default_dependencies
= false;
600 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
601 MOUNT(u
)->exec_context
.std_output
= EXEC_OUTPUT_NULL
;
602 MOUNT(u
)->exec_context
.std_input
= EXEC_INPUT_NULL
;
605 u
->description
= strdup("Root Mount");
610 static int mount_load(Unit
*u
) {
615 assert(u
->load_state
== UNIT_STUB
);
617 r
= mount_load_root_mount(u
);
621 if (m
->from_proc_self_mountinfo
|| u
->perpetual
)
622 r
= unit_load_fragment_and_dropin_optional(u
);
624 r
= unit_load_fragment_and_dropin(u
);
628 /* This is a new unit? Then let's add in some extras */
629 if (u
->load_state
== UNIT_LOADED
) {
630 r
= mount_add_extras(m
);
635 return mount_verify(m
);
638 static void mount_set_state(Mount
*m
, MountState state
) {
639 MountState old_state
;
642 old_state
= m
->state
;
645 if (!mount_state_active(state
)) {
646 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
647 mount_unwatch_control_pid(m
);
648 m
->control_command
= NULL
;
649 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
652 if (state
!= old_state
)
653 log_unit_debug(UNIT(m
), "Changed %s -> %s", mount_state_to_string(old_state
), mount_state_to_string(state
));
655 unit_notify(UNIT(m
), state_translation_table
[old_state
], state_translation_table
[state
], m
->reload_result
== MOUNT_SUCCESS
);
656 m
->reload_result
= MOUNT_SUCCESS
;
659 static int mount_coldplug(Unit
*u
) {
661 MountState new_state
= MOUNT_DEAD
;
665 assert(m
->state
== MOUNT_DEAD
);
667 if (m
->deserialized_state
!= m
->state
)
668 new_state
= m
->deserialized_state
;
669 else if (m
->from_proc_self_mountinfo
)
670 new_state
= MOUNT_MOUNTED
;
672 if (new_state
== m
->state
)
675 if (m
->control_pid
> 0 &&
676 pid_is_unwaited(m
->control_pid
) &&
677 mount_state_active(new_state
)) {
679 r
= unit_watch_pid(UNIT(m
), m
->control_pid
);
683 r
= mount_arm_timer(m
, usec_add(u
->state_change_timestamp
.monotonic
, m
->timeout_usec
));
688 if (!IN_SET(new_state
, MOUNT_DEAD
, MOUNT_FAILED
))
689 (void) unit_setup_dynamic_creds(u
);
691 mount_set_state(m
, new_state
);
695 static void mount_dump(Unit
*u
, FILE *f
, const char *prefix
) {
702 p
= get_mount_parameters(m
);
705 "%sMount State: %s\n"
709 "%sFile System Type: %s\n"
711 "%sFrom /proc/self/mountinfo: %s\n"
712 "%sFrom fragment: %s\n"
714 "%sDirectoryMode: %04o\n"
715 "%sSloppyOptions: %s\n"
716 "%sLazyUnmount: %s\n"
717 "%sForceUnmount: %s\n",
718 prefix
, mount_state_to_string(m
->state
),
719 prefix
, mount_result_to_string(m
->result
),
721 prefix
, p
? strna(p
->what
) : "n/a",
722 prefix
, p
? strna(p
->fstype
) : "n/a",
723 prefix
, p
? strna(p
->options
) : "n/a",
724 prefix
, yes_no(m
->from_proc_self_mountinfo
),
725 prefix
, yes_no(m
->from_fragment
),
726 prefix
, yes_no(mount_is_extrinsic(m
)),
727 prefix
, m
->directory_mode
,
728 prefix
, yes_no(m
->sloppy_options
),
729 prefix
, yes_no(m
->lazy_unmount
),
730 prefix
, yes_no(m
->force_unmount
));
732 if (m
->control_pid
> 0)
734 "%sControl PID: "PID_FMT
"\n",
735 prefix
, m
->control_pid
);
737 exec_context_dump(&m
->exec_context
, f
, prefix
);
738 kill_context_dump(&m
->kill_context
, f
, prefix
);
739 cgroup_context_dump(&m
->cgroup_context
, f
, prefix
);
742 static int mount_spawn(Mount
*m
, ExecCommand
*c
, pid_t
*_pid
) {
745 ExecParameters exec_params
= {
746 .flags
= EXEC_APPLY_SANDBOXING
|EXEC_APPLY_CHROOT
|EXEC_APPLY_TTY_STDIN
,
756 (void) unit_realize_cgroup(UNIT(m
));
757 if (m
->reset_accounting
) {
758 (void) unit_reset_cpu_accounting(UNIT(m
));
759 (void) unit_reset_ip_accounting(UNIT(m
));
760 m
->reset_accounting
= false;
763 r
= unit_setup_exec_runtime(UNIT(m
));
767 r
= unit_setup_dynamic_creds(UNIT(m
));
771 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
775 manager_set_exec_params(UNIT(m
)->manager
, &exec_params
);
776 unit_set_exec_params(UNIT(m
), &exec_params
);
778 r
= exec_spawn(UNIT(m
),
788 r
= unit_watch_pid(UNIT(m
), pid
);
790 /* FIXME: we need to do something here */
798 static void mount_enter_dead(Mount
*m
, MountResult f
) {
801 if (m
->result
== MOUNT_SUCCESS
)
804 mount_set_state(m
, m
->result
!= MOUNT_SUCCESS
? MOUNT_FAILED
: MOUNT_DEAD
);
806 exec_runtime_destroy(m
->exec_runtime
);
807 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
);
809 exec_context_destroy_runtime_directory(&m
->exec_context
, UNIT(m
)->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
811 unit_unref_uid_gid(UNIT(m
), true);
813 dynamic_creds_destroy(&m
->dynamic_creds
);
816 static void mount_enter_mounted(Mount
*m
, MountResult f
) {
819 if (m
->result
== MOUNT_SUCCESS
)
822 mount_set_state(m
, MOUNT_MOUNTED
);
825 static void mount_enter_signal(Mount
*m
, MountState state
, MountResult f
) {
830 if (m
->result
== MOUNT_SUCCESS
)
833 r
= unit_kill_context(
836 (state
!= MOUNT_MOUNTING_SIGTERM
&& state
!= MOUNT_UNMOUNTING_SIGTERM
&& state
!= MOUNT_REMOUNTING_SIGTERM
) ?
837 KILL_KILL
: KILL_TERMINATE
,
845 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
849 mount_set_state(m
, state
);
850 } else if (state
== MOUNT_REMOUNTING_SIGTERM
)
851 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
852 else if (state
== MOUNT_REMOUNTING_SIGKILL
)
853 mount_enter_mounted(m
, MOUNT_SUCCESS
);
854 else if (state
== MOUNT_MOUNTING_SIGTERM
)
855 mount_enter_signal(m
, MOUNT_MOUNTING_SIGKILL
, MOUNT_SUCCESS
);
856 else if (state
== MOUNT_UNMOUNTING_SIGTERM
)
857 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
859 mount_enter_dead(m
, MOUNT_SUCCESS
);
864 log_unit_warning_errno(UNIT(m
), r
, "Failed to kill processes: %m");
866 if (IN_SET(state
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_REMOUNTING_SIGKILL
))
867 mount_enter_mounted(m
, MOUNT_FAILURE_RESOURCES
);
869 mount_enter_dead(m
, MOUNT_FAILURE_RESOURCES
);
872 static void mount_enter_unmounting(Mount
*m
) {
877 /* Start counting our attempts */
878 if (!IN_SET(m
->state
,
880 MOUNT_UNMOUNTING_SIGTERM
,
881 MOUNT_UNMOUNTING_SIGKILL
))
882 m
->n_retry_umount
= 0;
884 m
->control_command_id
= MOUNT_EXEC_UNMOUNT
;
885 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_UNMOUNT
;
887 r
= exec_command_set(m
->control_command
, UMOUNT_PATH
, m
->where
, "-c", NULL
);
888 if (r
>= 0 && m
->lazy_unmount
)
889 r
= exec_command_append(m
->control_command
, "-l", NULL
);
890 if (r
>= 0 && m
->force_unmount
)
891 r
= exec_command_append(m
->control_command
, "-f", NULL
);
895 mount_unwatch_control_pid(m
);
897 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
901 mount_set_state(m
, MOUNT_UNMOUNTING
);
906 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'umount' task: %m");
907 mount_enter_mounted(m
, MOUNT_FAILURE_RESOURCES
);
910 static void mount_enter_mounting(Mount
*m
) {
916 m
->control_command_id
= MOUNT_EXEC_MOUNT
;
917 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_MOUNT
;
919 r
= unit_fail_if_symlink(UNIT(m
), m
->where
);
923 (void) mkdir_p_label(m
->where
, m
->directory_mode
);
925 unit_warn_if_dir_nonempty(UNIT(m
), m
->where
);
927 /* Create the source directory for bind-mounts if needed */
928 p
= get_mount_parameters_fragment(m
);
929 if (p
&& mount_is_bind(p
))
930 (void) mkdir_p_label(p
->what
, m
->directory_mode
);
933 _cleanup_free_
char *opts
= NULL
;
935 r
= fstab_filter_options(p
->options
, "nofail\0" "noauto\0" "auto\0", NULL
, NULL
, &opts
);
939 r
= exec_command_set(m
->control_command
, MOUNT_PATH
, p
->what
, m
->where
, NULL
);
940 if (r
>= 0 && m
->sloppy_options
)
941 r
= exec_command_append(m
->control_command
, "-s", NULL
);
942 if (r
>= 0 && p
->fstype
)
943 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
944 if (r
>= 0 && !isempty(opts
))
945 r
= exec_command_append(m
->control_command
, "-o", opts
, NULL
);
952 mount_unwatch_control_pid(m
);
954 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
958 mount_set_state(m
, MOUNT_MOUNTING
);
963 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'mount' task: %m");
964 mount_enter_dead(m
, MOUNT_FAILURE_RESOURCES
);
967 static void mount_enter_remounting(Mount
*m
) {
973 m
->control_command_id
= MOUNT_EXEC_REMOUNT
;
974 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_REMOUNT
;
976 p
= get_mount_parameters_fragment(m
);
981 o
= strjoina("remount,", p
->options
);
985 r
= exec_command_set(m
->control_command
, MOUNT_PATH
,
988 if (r
>= 0 && m
->sloppy_options
)
989 r
= exec_command_append(m
->control_command
, "-s", NULL
);
990 if (r
>= 0 && p
->fstype
)
991 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
998 mount_unwatch_control_pid(m
);
1000 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
1004 mount_set_state(m
, MOUNT_REMOUNTING
);
1009 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'remount' task: %m");
1010 m
->reload_result
= MOUNT_FAILURE_RESOURCES
;
1011 mount_enter_mounted(m
, MOUNT_SUCCESS
);
1014 static int mount_start(Unit
*u
) {
1015 Mount
*m
= MOUNT(u
);
1020 /* We cannot fulfill this request right now, try again later
1022 if (IN_SET(m
->state
,
1024 MOUNT_UNMOUNTING_SIGTERM
,
1025 MOUNT_UNMOUNTING_SIGKILL
,
1026 MOUNT_MOUNTING_SIGTERM
,
1027 MOUNT_MOUNTING_SIGKILL
))
1030 /* Already on it! */
1031 if (m
->state
== MOUNT_MOUNTING
)
1034 assert(IN_SET(m
->state
, MOUNT_DEAD
, MOUNT_FAILED
));
1036 r
= unit_start_limit_test(u
);
1038 mount_enter_dead(m
, MOUNT_FAILURE_START_LIMIT_HIT
);
1042 r
= unit_acquire_invocation_id(u
);
1046 m
->result
= MOUNT_SUCCESS
;
1047 m
->reload_result
= MOUNT_SUCCESS
;
1048 m
->reset_accounting
= true;
1050 mount_enter_mounting(m
);
1054 static int mount_stop(Unit
*u
) {
1055 Mount
*m
= MOUNT(u
);
1060 if (IN_SET(m
->state
,
1062 MOUNT_UNMOUNTING_SIGKILL
,
1063 MOUNT_UNMOUNTING_SIGTERM
,
1064 MOUNT_MOUNTING_SIGTERM
,
1065 MOUNT_MOUNTING_SIGKILL
))
1068 assert(IN_SET(m
->state
,
1070 MOUNT_MOUNTING_DONE
,
1073 MOUNT_REMOUNTING_SIGTERM
,
1074 MOUNT_REMOUNTING_SIGKILL
));
1076 mount_enter_unmounting(m
);
1080 static int mount_reload(Unit
*u
) {
1081 Mount
*m
= MOUNT(u
);
1085 if (m
->state
== MOUNT_MOUNTING_DONE
)
1088 assert(m
->state
== MOUNT_MOUNTED
);
1090 mount_enter_remounting(m
);
1094 static int mount_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
1095 Mount
*m
= MOUNT(u
);
1101 unit_serialize_item(u
, f
, "state", mount_state_to_string(m
->state
));
1102 unit_serialize_item(u
, f
, "result", mount_result_to_string(m
->result
));
1103 unit_serialize_item(u
, f
, "reload-result", mount_result_to_string(m
->reload_result
));
1105 if (m
->control_pid
> 0)
1106 unit_serialize_item_format(u
, f
, "control-pid", PID_FMT
, m
->control_pid
);
1108 if (m
->control_command_id
>= 0)
1109 unit_serialize_item(u
, f
, "control-command", mount_exec_command_to_string(m
->control_command_id
));
1114 static int mount_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
1115 Mount
*m
= MOUNT(u
);
1122 if (streq(key
, "state")) {
1125 if ((state
= mount_state_from_string(value
)) < 0)
1126 log_unit_debug(u
, "Failed to parse state value: %s", value
);
1128 m
->deserialized_state
= state
;
1129 } else if (streq(key
, "result")) {
1132 f
= mount_result_from_string(value
);
1134 log_unit_debug(u
, "Failed to parse result value: %s", value
);
1135 else if (f
!= MOUNT_SUCCESS
)
1138 } else if (streq(key
, "reload-result")) {
1141 f
= mount_result_from_string(value
);
1143 log_unit_debug(u
, "Failed to parse reload result value: %s", value
);
1144 else if (f
!= MOUNT_SUCCESS
)
1145 m
->reload_result
= f
;
1147 } else if (streq(key
, "control-pid")) {
1150 if (parse_pid(value
, &pid
) < 0)
1151 log_unit_debug(u
, "Failed to parse control-pid value: %s", value
);
1153 m
->control_pid
= pid
;
1154 } else if (streq(key
, "control-command")) {
1155 MountExecCommand id
;
1157 id
= mount_exec_command_from_string(value
);
1159 log_unit_debug(u
, "Failed to parse exec-command value: %s", value
);
1161 m
->control_command_id
= id
;
1162 m
->control_command
= m
->exec_command
+ id
;
1165 log_unit_debug(u
, "Unknown serialization key: %s", key
);
1170 _pure_
static UnitActiveState
mount_active_state(Unit
*u
) {
1173 return state_translation_table
[MOUNT(u
)->state
];
1176 _pure_
static const char *mount_sub_state_to_string(Unit
*u
) {
1179 return mount_state_to_string(MOUNT(u
)->state
);
1182 _pure_
static bool mount_check_gc(Unit
*u
) {
1183 Mount
*m
= MOUNT(u
);
1187 return m
->from_proc_self_mountinfo
;
1190 static void mount_sigchld_event(Unit
*u
, pid_t pid
, int code
, int status
) {
1191 Mount
*m
= MOUNT(u
);
1197 if (pid
!= m
->control_pid
)
1202 if (is_clean_exit(code
, status
, EXIT_CLEAN_COMMAND
, NULL
))
1204 else if (code
== CLD_EXITED
)
1205 f
= MOUNT_FAILURE_EXIT_CODE
;
1206 else if (code
== CLD_KILLED
)
1207 f
= MOUNT_FAILURE_SIGNAL
;
1208 else if (code
== CLD_DUMPED
)
1209 f
= MOUNT_FAILURE_CORE_DUMP
;
1211 assert_not_reached("Unknown code");
1213 if (m
->result
== MOUNT_SUCCESS
)
1216 if (m
->control_command
) {
1217 exec_status_exit(&m
->control_command
->exec_status
, &m
->exec_context
, pid
, code
, status
);
1219 m
->control_command
= NULL
;
1220 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
1223 log_unit_full(u
, f
== MOUNT_SUCCESS
? LOG_DEBUG
: LOG_NOTICE
, 0,
1224 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code
), status
);
1226 /* Note that mount(8) returning and the kernel sending us a
1227 * mount table change event might happen out-of-order. If an
1228 * operation succeed we assume the kernel will follow soon too
1229 * and already change into the resulting state. If it fails
1230 * we check if the kernel still knows about the mount. and
1231 * change state accordingly. */
1235 case MOUNT_MOUNTING
:
1236 case MOUNT_MOUNTING_DONE
:
1237 case MOUNT_MOUNTING_SIGKILL
:
1238 case MOUNT_MOUNTING_SIGTERM
:
1240 if (f
== MOUNT_SUCCESS
|| m
->from_proc_self_mountinfo
)
1241 /* If /bin/mount returned success, or if we see the mount point in /proc/self/mountinfo we are
1242 * happy. If we see the first condition first, we should see the second condition
1243 * immediately after – or /bin/mount lies to us and is broken. */
1244 mount_enter_mounted(m
, f
);
1246 mount_enter_dead(m
, f
);
1249 case MOUNT_REMOUNTING
:
1250 case MOUNT_REMOUNTING_SIGKILL
:
1251 case MOUNT_REMOUNTING_SIGTERM
:
1253 m
->reload_result
= f
;
1254 if (m
->from_proc_self_mountinfo
)
1255 mount_enter_mounted(m
, MOUNT_SUCCESS
);
1257 mount_enter_dead(m
, MOUNT_SUCCESS
);
1261 case MOUNT_UNMOUNTING
:
1262 case MOUNT_UNMOUNTING_SIGKILL
:
1263 case MOUNT_UNMOUNTING_SIGTERM
:
1265 if (f
== MOUNT_SUCCESS
) {
1267 if (m
->from_proc_self_mountinfo
) {
1269 /* Still a mount point? If so, let's
1270 * try again. Most likely there were
1271 * multiple mount points stacked on
1272 * top of each other. Note that due to
1273 * the io event priority logic we can
1274 * be sure the new mountinfo is loaded
1275 * before we process the SIGCHLD for
1276 * the mount command. */
1278 if (m
->n_retry_umount
< RETRY_UMOUNT_MAX
) {
1279 log_unit_debug(u
, "Mount still present, trying again.");
1280 m
->n_retry_umount
++;
1281 mount_enter_unmounting(m
);
1283 log_unit_debug(u
, "Mount still present after %u attempts to unmount, giving up.", m
->n_retry_umount
);
1284 mount_enter_mounted(m
, f
);
1287 mount_enter_dead(m
, f
);
1289 } else if (m
->from_proc_self_mountinfo
)
1290 mount_enter_mounted(m
, f
);
1292 mount_enter_dead(m
, f
);
1296 assert_not_reached("Uh, control process died at wrong time.");
1299 /* Notify clients about changed exit status */
1300 unit_add_to_dbus_queue(u
);
1303 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
1304 Mount
*m
= MOUNT(userdata
);
1307 assert(m
->timer_event_source
== source
);
1311 case MOUNT_MOUNTING
:
1312 case MOUNT_MOUNTING_DONE
:
1313 log_unit_warning(UNIT(m
), "Mounting timed out. Stopping.");
1314 mount_enter_signal(m
, MOUNT_MOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1317 case MOUNT_REMOUNTING
:
1318 log_unit_warning(UNIT(m
), "Remounting timed out. Stopping.");
1319 m
->reload_result
= MOUNT_FAILURE_TIMEOUT
;
1320 mount_enter_mounted(m
, MOUNT_SUCCESS
);
1323 case MOUNT_UNMOUNTING
:
1324 log_unit_warning(UNIT(m
), "Unmounting timed out. Stopping.");
1325 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1328 case MOUNT_MOUNTING_SIGTERM
:
1329 if (m
->kill_context
.send_sigkill
) {
1330 log_unit_warning(UNIT(m
), "Mounting timed out. Killing.");
1331 mount_enter_signal(m
, MOUNT_MOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1333 log_unit_warning(UNIT(m
), "Mounting timed out. Skipping SIGKILL. Ignoring.");
1335 if (m
->from_proc_self_mountinfo
)
1336 mount_enter_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1338 mount_enter_dead(m
, MOUNT_FAILURE_TIMEOUT
);
1342 case MOUNT_REMOUNTING_SIGTERM
:
1343 if (m
->kill_context
.send_sigkill
) {
1344 log_unit_warning(UNIT(m
), "Remounting timed out. Killing.");
1345 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1347 log_unit_warning(UNIT(m
), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1349 if (m
->from_proc_self_mountinfo
)
1350 mount_enter_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1352 mount_enter_dead(m
, MOUNT_FAILURE_TIMEOUT
);
1356 case MOUNT_UNMOUNTING_SIGTERM
:
1357 if (m
->kill_context
.send_sigkill
) {
1358 log_unit_warning(UNIT(m
), "Unmounting timed out. Killing.");
1359 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1361 log_unit_warning(UNIT(m
), "Unmounting timed out. Skipping SIGKILL. Ignoring.");
1363 if (m
->from_proc_self_mountinfo
)
1364 mount_enter_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1366 mount_enter_dead(m
, MOUNT_FAILURE_TIMEOUT
);
1370 case MOUNT_MOUNTING_SIGKILL
:
1371 case MOUNT_REMOUNTING_SIGKILL
:
1372 case MOUNT_UNMOUNTING_SIGKILL
:
1373 log_unit_warning(UNIT(m
),"Mount process still around after SIGKILL. Ignoring.");
1375 if (m
->from_proc_self_mountinfo
)
1376 mount_enter_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1378 mount_enter_dead(m
, MOUNT_FAILURE_TIMEOUT
);
1382 assert_not_reached("Timeout at wrong time.");
1394 static int mount_setup_new_unit(
1398 const char *options
,
1400 MountSetupFlags
*flags
) {
1407 u
->source_path
= strdup("/proc/self/mountinfo");
1408 MOUNT(u
)->where
= strdup(where
);
1409 if (!u
->source_path
|| !MOUNT(u
)->where
)
1412 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1413 MOUNT(u
)->from_proc_self_mountinfo
= true;
1414 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1416 p
->what
= strdup(what
);
1417 p
->options
= strdup(options
);
1418 p
->fstype
= strdup(fstype
);
1419 if (!p
->what
|| !p
->options
|| !p
->fstype
)
1422 if (!mount_is_extrinsic(MOUNT(u
))) {
1426 target
= mount_is_network(p
) ? SPECIAL_REMOTE_FS_TARGET
: SPECIAL_LOCAL_FS_TARGET
;
1427 r
= unit_add_dependency_by_name(u
, UNIT_BEFORE
, target
, NULL
, true);
1431 r
= unit_add_dependency_by_name(u
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true);
1436 unit_add_to_load_queue(u
);
1437 flags
->is_mounted
= true;
1438 flags
->just_mounted
= true;
1439 flags
->just_changed
= true;
1444 static int mount_setup_existing_unit(
1448 const char *options
,
1450 MountSetupFlags
*flags
) {
1453 bool load_extras
= false;
1459 if (!MOUNT(u
)->where
) {
1460 MOUNT(u
)->where
= strdup(where
);
1461 if (!MOUNT(u
)->where
)
1465 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1466 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1468 r1
= free_and_strdup(&p
->what
, what
);
1469 r2
= free_and_strdup(&p
->options
, options
);
1470 r3
= free_and_strdup(&p
->fstype
, fstype
);
1471 if (r1
< 0 || r2
< 0 || r3
< 0)
1474 flags
->just_changed
= r1
> 0 || r2
> 0 || r3
> 0;
1475 flags
->is_mounted
= true;
1476 flags
->just_mounted
= !MOUNT(u
)->from_proc_self_mountinfo
;
1478 MOUNT(u
)->from_proc_self_mountinfo
= true;
1480 if (!mount_is_extrinsic(MOUNT(u
)) && mount_is_network(p
)) {
1481 /* _netdev option may have shown up late, or on a
1482 * remount. Add remote-fs dependencies, even though
1483 * local-fs ones may already be there.
1485 * Note: due to a current limitation (we don't track
1486 * in the dependency "Set*" objects who created a
1487 * dependency), we can only add deps, never lose them,
1488 * until the next full daemon-reload. */
1489 unit_add_dependency_by_name(u
, UNIT_BEFORE
, SPECIAL_REMOTE_FS_TARGET
, NULL
, true);
1493 if (u
->load_state
== UNIT_NOT_FOUND
) {
1494 u
->load_state
= UNIT_LOADED
;
1497 /* Load in the extras later on, after we
1498 * finished initialization of the unit */
1500 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1502 flags
->just_changed
= true;
1506 return mount_add_extras(MOUNT(u
));
1511 static int mount_setup_unit(
1515 const char *options
,
1519 _cleanup_free_
char *e
= NULL
;
1520 MountSetupFlags flags
;
1530 /* Ignore API mount points. They should never be referenced in
1531 * dependencies ever. */
1532 if (mount_point_is_api(where
) || mount_point_ignore(where
))
1535 if (streq(fstype
, "autofs"))
1538 /* probably some kind of swap, ignore */
1539 if (!is_path(where
))
1542 r
= unit_name_from_path(where
, ".mount", &e
);
1546 u
= manager_get_unit(m
, e
);
1548 /* First time we see this mount point meaning that it's
1549 * not been initiated by a mount unit but rather by the
1550 * sysadmin having called mount(8) directly. */
1551 r
= unit_new_for_name(m
, sizeof(Mount
), e
, &u
);
1555 r
= mount_setup_new_unit(u
, what
, where
, options
, fstype
, &flags
);
1559 r
= mount_setup_existing_unit(u
, what
, where
, options
, fstype
, &flags
);
1565 MOUNT(u
)->is_mounted
= flags
.is_mounted
;
1566 MOUNT(u
)->just_mounted
= flags
.just_mounted
;
1567 MOUNT(u
)->just_changed
= flags
.just_changed
;
1570 if (flags
.just_changed
)
1571 unit_add_to_dbus_queue(u
);
1575 log_warning_errno(r
, "Failed to set up mount unit: %m");
1579 static int mount_load_proc_self_mountinfo(Manager
*m
, bool set_flags
) {
1580 _cleanup_(mnt_free_tablep
) struct libmnt_table
*t
= NULL
;
1581 _cleanup_(mnt_free_iterp
) struct libmnt_iter
*i
= NULL
;
1586 t
= mnt_new_table();
1590 i
= mnt_new_iter(MNT_ITER_FORWARD
);
1594 r
= mnt_table_parse_mtab(t
, NULL
);
1596 return log_error_errno(r
, "Failed to parse /proc/self/mountinfo: %m");
1600 const char *device
, *path
, *options
, *fstype
;
1601 _cleanup_free_
char *d
= NULL
, *p
= NULL
;
1602 struct libmnt_fs
*fs
;
1605 k
= mnt_table_next_fs(t
, i
, &fs
);
1609 return log_error_errno(k
, "Failed to get next entry from /proc/self/mountinfo: %m");
1611 device
= mnt_fs_get_source(fs
);
1612 path
= mnt_fs_get_target(fs
);
1613 options
= mnt_fs_get_options(fs
);
1614 fstype
= mnt_fs_get_fstype(fs
);
1616 if (!device
|| !path
)
1619 if (cunescape(device
, UNESCAPE_RELAX
, &d
) < 0)
1622 if (cunescape(path
, UNESCAPE_RELAX
, &p
) < 0)
1625 (void) device_found_node(m
, d
, true, DEVICE_FOUND_MOUNT
, set_flags
);
1627 k
= mount_setup_unit(m
, d
, p
, options
, fstype
, set_flags
);
1628 if (r
== 0 && k
< 0)
1635 static void mount_shutdown(Manager
*m
) {
1639 m
->mount_event_source
= sd_event_source_unref(m
->mount_event_source
);
1641 mnt_unref_monitor(m
->mount_monitor
);
1642 m
->mount_monitor
= NULL
;
1645 static int mount_get_timeout(Unit
*u
, usec_t
*timeout
) {
1646 Mount
*m
= MOUNT(u
);
1650 if (!m
->timer_event_source
)
1653 r
= sd_event_source_get_time(m
->timer_event_source
, &t
);
1656 if (t
== USEC_INFINITY
)
1663 static int synthesize_root_mount(Manager
*m
) {
1669 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1670 * unconditionally synthesize it here and mark it as perpetual. */
1672 u
= manager_get_unit(m
, SPECIAL_ROOT_MOUNT
);
1674 r
= unit_new_for_name(m
, sizeof(Mount
), SPECIAL_ROOT_MOUNT
, &u
);
1676 return log_error_errno(r
, "Failed to allocate the special " SPECIAL_ROOT_MOUNT
" unit: %m");
1679 u
->perpetual
= true;
1680 MOUNT(u
)->deserialized_state
= MOUNT_MOUNTED
;
1682 unit_add_to_load_queue(u
);
1683 unit_add_to_dbus_queue(u
);
1688 static bool mount_is_mounted(Mount
*m
) {
1691 return UNIT(m
)->perpetual
|| m
->is_mounted
;
1694 static void mount_enumerate(Manager
*m
) {
1699 r
= synthesize_root_mount(m
);
1705 if (!m
->mount_monitor
) {
1708 m
->mount_monitor
= mnt_new_monitor();
1709 if (!m
->mount_monitor
) {
1714 r
= mnt_monitor_enable_kernel(m
->mount_monitor
, 1);
1716 log_error_errno(r
, "Failed to enable watching of kernel mount events: %m");
1720 r
= mnt_monitor_enable_userspace(m
->mount_monitor
, 1, NULL
);
1722 log_error_errno(r
, "Failed to enable watching of userspace mount events: %m");
1726 /* mnt_unref_monitor() will close the fd */
1727 fd
= r
= mnt_monitor_get_fd(m
->mount_monitor
);
1729 log_error_errno(r
, "Failed to acquire watch file descriptor: %m");
1733 r
= sd_event_add_io(m
->event
, &m
->mount_event_source
, fd
, EPOLLIN
, mount_dispatch_io
, m
);
1735 log_error_errno(r
, "Failed to watch mount file descriptor: %m");
1739 r
= sd_event_source_set_priority(m
->mount_event_source
, -10);
1741 log_error_errno(r
, "Failed to adjust mount watch priority: %m");
1745 (void) sd_event_source_set_description(m
->mount_event_source
, "mount-monitor-dispatch");
1748 r
= mount_load_proc_self_mountinfo(m
, false);
1758 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
1759 _cleanup_set_free_ Set
*around
= NULL
, *gone
= NULL
;
1760 Manager
*m
= userdata
;
1767 assert(revents
& EPOLLIN
);
1769 if (fd
== mnt_monitor_get_fd(m
->mount_monitor
)) {
1770 bool rescan
= false;
1772 /* Drain all events and verify that the event is valid.
1774 * Note that libmount also monitors /run/mount mkdir if the
1775 * directory does not exist yet. The mkdir may generate event
1776 * which is irrelevant for us.
1778 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1780 r
= mnt_monitor_next_change(m
->mount_monitor
, NULL
, NULL
);
1784 return log_error_errno(r
, "Failed to drain libmount events");
1787 log_debug("libmount event [rescan: %s]", yes_no(rescan
));
1792 r
= mount_load_proc_self_mountinfo(m
, true);
1794 /* Reset flags, just in case, for later calls */
1795 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1796 Mount
*mount
= MOUNT(u
);
1798 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1804 manager_dispatch_load_queue(m
);
1806 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1807 Mount
*mount
= MOUNT(u
);
1809 if (!mount_is_mounted(mount
)) {
1811 /* A mount point is not around right now. It
1812 * might be gone, or might never have
1815 if (mount
->from_proc_self_mountinfo
&&
1816 mount
->parameters_proc_self_mountinfo
.what
) {
1818 /* Remember that this device might just have disappeared */
1819 if (set_ensure_allocated(&gone
, &string_hash_ops
) < 0 ||
1820 set_put(gone
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1821 log_oom(); /* we don't care too much about OOM here... */
1824 mount
->from_proc_self_mountinfo
= false;
1826 switch (mount
->state
) {
1829 /* This has just been unmounted by
1830 * somebody else, follow the state
1832 mount
->result
= MOUNT_SUCCESS
; /* make sure we forget any earlier umount failures */
1833 mount_enter_dead(mount
, MOUNT_SUCCESS
);
1840 } else if (mount
->just_mounted
|| mount
->just_changed
) {
1842 /* A mount point was added or changed */
1844 switch (mount
->state
) {
1849 /* This has just been mounted by somebody else, follow the state change, but let's
1850 * generate a new invocation ID for this implicitly and automatically. */
1851 (void) unit_acquire_invocation_id(UNIT(mount
));
1852 mount_enter_mounted(mount
, MOUNT_SUCCESS
);
1855 case MOUNT_MOUNTING
:
1856 mount_set_state(mount
, MOUNT_MOUNTING_DONE
);
1860 /* Nothing really changed, but let's
1861 * issue an notification call
1862 * nonetheless, in case somebody is
1863 * waiting for this. (e.g. file system
1864 * ro/rw remounts.) */
1865 mount_set_state(mount
, mount
->state
);
1870 if (mount_is_mounted(mount
) &&
1871 mount
->from_proc_self_mountinfo
&&
1872 mount
->parameters_proc_self_mountinfo
.what
) {
1874 if (set_ensure_allocated(&around
, &string_hash_ops
) < 0 ||
1875 set_put(around
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1879 /* Reset the flags for later calls */
1880 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1883 SET_FOREACH(what
, gone
, i
) {
1884 if (set_contains(around
, what
))
1887 /* Let the device units know that the device is no longer mounted */
1888 (void) device_found_node(m
, what
, false, DEVICE_FOUND_MOUNT
, true);
1894 static void mount_reset_failed(Unit
*u
) {
1895 Mount
*m
= MOUNT(u
);
1899 if (m
->state
== MOUNT_FAILED
)
1900 mount_set_state(m
, MOUNT_DEAD
);
1902 m
->result
= MOUNT_SUCCESS
;
1903 m
->reload_result
= MOUNT_SUCCESS
;
1906 static int mount_kill(Unit
*u
, KillWho who
, int signo
, sd_bus_error
*error
) {
1907 return unit_kill_common(u
, who
, signo
, -1, MOUNT(u
)->control_pid
, error
);
1910 static int mount_control_pid(Unit
*u
) {
1911 Mount
*m
= MOUNT(u
);
1915 return m
->control_pid
;
1918 static const char* const mount_exec_command_table
[_MOUNT_EXEC_COMMAND_MAX
] = {
1919 [MOUNT_EXEC_MOUNT
] = "ExecMount",
1920 [MOUNT_EXEC_UNMOUNT
] = "ExecUnmount",
1921 [MOUNT_EXEC_REMOUNT
] = "ExecRemount",
1924 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command
, MountExecCommand
);
1926 static const char* const mount_result_table
[_MOUNT_RESULT_MAX
] = {
1927 [MOUNT_SUCCESS
] = "success",
1928 [MOUNT_FAILURE_RESOURCES
] = "resources",
1929 [MOUNT_FAILURE_TIMEOUT
] = "timeout",
1930 [MOUNT_FAILURE_EXIT_CODE
] = "exit-code",
1931 [MOUNT_FAILURE_SIGNAL
] = "signal",
1932 [MOUNT_FAILURE_CORE_DUMP
] = "core-dump",
1933 [MOUNT_FAILURE_START_LIMIT_HIT
] = "start-limit-hit",
1936 DEFINE_STRING_TABLE_LOOKUP(mount_result
, MountResult
);
1938 const UnitVTable mount_vtable
= {
1939 .object_size
= sizeof(Mount
),
1940 .exec_context_offset
= offsetof(Mount
, exec_context
),
1941 .cgroup_context_offset
= offsetof(Mount
, cgroup_context
),
1942 .kill_context_offset
= offsetof(Mount
, kill_context
),
1943 .exec_runtime_offset
= offsetof(Mount
, exec_runtime
),
1944 .dynamic_creds_offset
= offsetof(Mount
, dynamic_creds
),
1950 .private_section
= "Mount",
1956 .coldplug
= mount_coldplug
,
1960 .start
= mount_start
,
1962 .reload
= mount_reload
,
1966 .serialize
= mount_serialize
,
1967 .deserialize_item
= mount_deserialize_item
,
1969 .active_state
= mount_active_state
,
1970 .sub_state_to_string
= mount_sub_state_to_string
,
1972 .check_gc
= mount_check_gc
,
1974 .sigchld_event
= mount_sigchld_event
,
1976 .reset_failed
= mount_reset_failed
,
1978 .control_pid
= mount_control_pid
,
1980 .bus_vtable
= bus_mount_vtable
,
1981 .bus_set_property
= bus_mount_set_property
,
1982 .bus_commit_properties
= bus_mount_commit_properties
,
1984 .get_timeout
= mount_get_timeout
,
1986 .can_transient
= true,
1988 .enumerate
= mount_enumerate
,
1989 .shutdown
= mount_shutdown
,
1991 .status_message_formats
= {
1992 .starting_stopping
= {
1993 [0] = "Mounting %s...",
1994 [1] = "Unmounting %s...",
1996 .finished_start_job
= {
1997 [JOB_DONE
] = "Mounted %s.",
1998 [JOB_FAILED
] = "Failed to mount %s.",
1999 [JOB_TIMEOUT
] = "Timed out mounting %s.",
2001 .finished_stop_job
= {
2002 [JOB_DONE
] = "Unmounted %s.",
2003 [JOB_FAILED
] = "Failed unmounting %s.",
2004 [JOB_TIMEOUT
] = "Timed out unmounting %s.",