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_REMOUNTING_SIGTERM
] = UNIT_RELOADING
,
62 [MOUNT_REMOUNTING_SIGKILL
] = UNIT_RELOADING
,
63 [MOUNT_UNMOUNTING_SIGTERM
] = UNIT_DEACTIVATING
,
64 [MOUNT_UNMOUNTING_SIGKILL
] = UNIT_DEACTIVATING
,
65 [MOUNT_FAILED
] = UNIT_FAILED
68 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
);
69 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
);
71 static bool MOUNT_STATE_WITH_PROCESS(MountState state
) {
76 MOUNT_REMOUNTING_SIGTERM
,
77 MOUNT_REMOUNTING_SIGKILL
,
79 MOUNT_UNMOUNTING_SIGTERM
,
80 MOUNT_UNMOUNTING_SIGKILL
);
83 static bool mount_needs_network(const char *options
, const char *fstype
) {
84 if (fstab_test_option(options
, "_netdev\0"))
87 if (fstype
&& fstype_is_network(fstype
))
93 static bool mount_is_network(const MountParameters
*p
) {
96 return mount_needs_network(p
->options
, p
->fstype
);
99 static bool mount_is_loop(const MountParameters
*p
) {
102 if (fstab_test_option(p
->options
, "loop\0"))
108 static bool mount_is_bind(const MountParameters
*p
) {
111 if (fstab_test_option(p
->options
, "bind\0" "rbind\0"))
114 if (p
->fstype
&& STR_IN_SET(p
->fstype
, "bind", "rbind"))
120 static bool mount_is_auto(const MountParameters
*p
) {
123 return !fstab_test_option(p
->options
, "noauto\0");
126 static bool mount_is_automount(const MountParameters
*p
) {
129 return fstab_test_option(p
->options
,
130 "comment=systemd.automount\0"
131 "x-systemd.automount\0");
134 static bool mount_is_bound_to_device(const Mount
*m
) {
135 const MountParameters
*p
;
137 if (m
->from_fragment
)
140 p
= &m
->parameters_proc_self_mountinfo
;
141 return fstab_test_option(p
->options
, "x-systemd.device-bound\0");
144 static bool needs_quota(const MountParameters
*p
) {
147 /* Quotas are not enabled on network filesystems,
148 * but we want them, for example, on storage connected via iscsi */
149 if (p
->fstype
&& fstype_is_network(p
->fstype
))
152 if (mount_is_bind(p
))
155 return fstab_test_option(p
->options
,
156 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
159 const char *mount_get_fstype(const Mount
*m
) {
160 const char *type
= NULL
;
164 if (m
->from_proc_self_mountinfo
&& m
->parameters_proc_self_mountinfo
.fstype
)
165 type
= m
->parameters_proc_self_mountinfo
.fstype
;
166 else if (m
->from_fragment
&& m
->parameters_fragment
.fstype
)
167 type
= m
->parameters_fragment
.fstype
;
174 static void mount_init(Unit
*u
) {
178 assert(u
->load_state
== UNIT_STUB
);
180 m
->timeout_usec
= u
->manager
->default_timeout_start_usec
;
181 m
->directory_mode
= 0755;
183 /* We need to make sure that /usr/bin/mount is always called
184 * in the same process group as us, so that the autofs kernel
185 * side doesn't send us another mount request while we are
186 * already trying to comply its last one. */
187 m
->exec_context
.same_pgrp
= true;
189 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
191 u
->ignore_on_isolate
= true;
194 static int mount_arm_timer(Mount
*m
, usec_t usec
) {
199 if (m
->timer_event_source
) {
200 r
= sd_event_source_set_time(m
->timer_event_source
, usec
);
204 return sd_event_source_set_enabled(m
->timer_event_source
, SD_EVENT_ONESHOT
);
207 if (usec
== USEC_INFINITY
)
210 r
= sd_event_add_time(
211 UNIT(m
)->manager
->event
,
212 &m
->timer_event_source
,
215 mount_dispatch_timer
, m
);
219 (void) sd_event_source_set_description(m
->timer_event_source
, "mount-timer");
224 static void mount_unwatch_control_pid(Mount
*m
) {
227 if (m
->control_pid
<= 0)
230 unit_unwatch_pid(UNIT(m
), m
->control_pid
);
234 static void mount_parameters_done(MountParameters
*p
) {
241 p
->what
= p
->options
= p
->fstype
= NULL
;
244 static void mount_done(Unit
*u
) {
249 m
->where
= mfree(m
->where
);
251 mount_parameters_done(&m
->parameters_proc_self_mountinfo
);
252 mount_parameters_done(&m
->parameters_fragment
);
254 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
);
255 exec_command_done_array(m
->exec_command
, _MOUNT_EXEC_COMMAND_MAX
);
256 m
->control_command
= NULL
;
258 dynamic_creds_unref(&m
->dynamic_creds
);
260 mount_unwatch_control_pid(m
);
262 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
265 _pure_
static MountParameters
* get_mount_parameters_fragment(Mount
*m
) {
268 if (m
->from_fragment
)
269 return &m
->parameters_fragment
;
274 _pure_
static MountParameters
* get_mount_parameters(Mount
*m
) {
277 if (m
->from_proc_self_mountinfo
)
278 return &m
->parameters_proc_self_mountinfo
;
280 return get_mount_parameters_fragment(m
);
283 static int mount_add_mount_links(Mount
*m
) {
284 _cleanup_free_
char *parent
= NULL
;
294 if (!path_equal(m
->where
, "/")) {
295 /* Adds in links to other mount points that might lie further
296 * up in the hierarchy */
298 parent
= dirname_malloc(m
->where
);
302 r
= unit_require_mounts_for(UNIT(m
), parent
);
307 /* Adds in links to other mount points that might be needed
308 * for the source path (if this is a bind mount or a loop mount) to be
310 pm
= get_mount_parameters_fragment(m
);
311 if (pm
&& pm
->what
&&
312 path_is_absolute(pm
->what
) &&
313 (mount_is_bind(pm
) || mount_is_loop(pm
) || !mount_is_network(pm
))) {
315 r
= unit_require_mounts_for(UNIT(m
), pm
->what
);
320 /* Adds in links to other units that use this path or paths
321 * further down in the hierarchy */
322 s
= manager_get_units_requiring_mounts_for(UNIT(m
)->manager
, m
->where
);
323 SET_FOREACH(other
, s
, i
) {
325 if (other
->load_state
!= UNIT_LOADED
)
328 if (other
== UNIT(m
))
331 r
= unit_add_dependency(other
, UNIT_AFTER
, UNIT(m
), true);
335 if (UNIT(m
)->fragment_path
) {
336 /* If we have fragment configuration, then make this dependency required */
337 r
= unit_add_dependency(other
, UNIT_REQUIRES
, UNIT(m
), true);
343 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
344 fstype
= mount_get_fstype(m
);
345 if (streq(fstype
, "tmpfs")) {
346 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_SWAP_TARGET
, NULL
, true);
354 static int mount_add_device_links(Mount
*m
) {
356 bool device_wants_mount
= false;
362 p
= get_mount_parameters(m
);
369 if (mount_is_bind(p
))
372 if (!is_device_path(p
->what
))
375 /* /dev/root is a really weird thing, it's not a real device,
376 * but just a path the kernel exports for the root file system
377 * specified on the kernel command line. Ignore it here. */
378 if (path_equal(p
->what
, "/dev/root"))
381 if (path_equal(m
->where
, "/"))
384 if (mount_is_auto(p
) && !mount_is_automount(p
) && MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
385 device_wants_mount
= true;
387 /* Mount units from /proc/self/mountinfo are not bound to devices
388 * by default since they're subject to races when devices are
389 * unplugged. But the user can still force this dep with an
390 * appropriate option (or udev property) so the mount units are
391 * automatically stopped when the device disappears suddenly. */
392 dep
= mount_is_bound_to_device(m
) ? UNIT_BINDS_TO
: UNIT_REQUIRES
;
394 r
= unit_add_node_link(UNIT(m
), p
->what
, device_wants_mount
, dep
);
401 static int mount_add_quota_links(Mount
*m
) {
407 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
))
410 p
= get_mount_parameters_fragment(m
);
417 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTACHECK_SERVICE
, NULL
, true);
421 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_WANTS
, SPECIAL_QUOTAON_SERVICE
, NULL
, true);
428 static bool mount_is_extrinsic(Mount
*m
) {
432 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
433 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
434 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
436 if (!MANAGER_IS_SYSTEM(UNIT(m
)->manager
)) /* We only automatically manage mounts if we are in system mode */
439 if (PATH_IN_SET(m
->where
, /* Don't bother with the OS data itself */
444 if (PATH_STARTSWITH_SET(m
->where
,
445 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
446 "/proc", /* All of this is API VFS */
447 "/sys", /* … dito … */
448 "/dev")) /* … dito … */
451 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
452 p
= get_mount_parameters(m
);
453 if (p
&& fstab_test_option(p
->options
, "x-initrd.mount\0") && !in_initrd())
459 static int mount_add_default_dependencies(Mount
*m
) {
466 if (!UNIT(m
)->default_dependencies
)
469 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
470 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
471 * file systems, it's also going to be virtual, and hence not worth the effort. */
472 if (mount_is_extrinsic(m
))
475 p
= get_mount_parameters(m
);
479 if (mount_is_network(p
)) {
480 /* We order ourselves after network.target. This is
481 * primarily useful at shutdown: services that take
482 * down the network should order themselves before
483 * network.target, so that they are shut down only
484 * after this mount unit is stopped. */
486 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, SPECIAL_NETWORK_TARGET
, NULL
, true);
490 /* We pull in network-online.target, and order
491 * ourselves after it. This is useful at start-up to
492 * actively pull in tools that want to be started
493 * before we start mounting network file systems, and
494 * whose purpose it is to delay this until the network
497 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_WANTS
, UNIT_AFTER
, SPECIAL_NETWORK_ONLINE_TARGET
, NULL
, true);
501 after
= SPECIAL_REMOTE_FS_PRE_TARGET
;
503 after
= SPECIAL_LOCAL_FS_PRE_TARGET
;
505 r
= unit_add_dependency_by_name(UNIT(m
), UNIT_AFTER
, after
, NULL
, true);
509 r
= unit_add_two_dependencies_by_name(UNIT(m
), UNIT_BEFORE
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true);
516 static int mount_verify(Mount
*m
) {
517 _cleanup_free_
char *e
= NULL
;
523 if (UNIT(m
)->load_state
!= UNIT_LOADED
)
526 if (!m
->from_fragment
&& !m
->from_proc_self_mountinfo
&& !UNIT(m
)->perpetual
)
529 r
= unit_name_from_path(m
->where
, ".mount", &e
);
531 return log_unit_error_errno(UNIT(m
), r
, "Failed to generate unit name from mount path: %m");
533 if (!unit_has_name(UNIT(m
), e
)) {
534 log_unit_error(UNIT(m
), "Where= setting doesn't match unit name. Refusing.");
538 if (mount_point_is_api(m
->where
) || mount_point_ignore(m
->where
)) {
539 log_unit_error(UNIT(m
), "Cannot create mount unit for API file system %s. Refusing.", m
->where
);
543 p
= get_mount_parameters_fragment(m
);
545 log_unit_error(UNIT(m
), "What= setting is missing. Refusing.");
549 if (m
->exec_context
.pam_name
&& m
->kill_context
.kill_mode
!= KILL_CONTROL_GROUP
) {
550 log_unit_error(UNIT(m
), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
557 static int mount_add_extras(Mount
*m
) {
563 if (u
->fragment_path
)
564 m
->from_fragment
= true;
567 r
= unit_name_to_path(u
->id
, &m
->where
);
572 path_kill_slashes(m
->where
);
574 if (!u
->description
) {
575 r
= unit_set_description(u
, m
->where
);
580 r
= mount_add_device_links(m
);
584 r
= mount_add_mount_links(m
);
588 r
= mount_add_quota_links(m
);
592 r
= unit_patch_contexts(u
);
596 r
= unit_add_exec_dependencies(u
, &m
->exec_context
);
600 r
= unit_set_default_slice(u
);
604 r
= mount_add_default_dependencies(m
);
611 static int mount_load_root_mount(Unit
*u
) {
614 if (!unit_has_name(u
, SPECIAL_ROOT_MOUNT
))
618 u
->default_dependencies
= false;
620 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
621 MOUNT(u
)->exec_context
.std_output
= EXEC_OUTPUT_NULL
;
622 MOUNT(u
)->exec_context
.std_input
= EXEC_INPUT_NULL
;
625 u
->description
= strdup("Root Mount");
630 static int mount_load(Unit
*u
) {
635 assert(u
->load_state
== UNIT_STUB
);
637 r
= mount_load_root_mount(u
);
641 if (m
->from_proc_self_mountinfo
|| u
->perpetual
)
642 r
= unit_load_fragment_and_dropin_optional(u
);
644 r
= unit_load_fragment_and_dropin(u
);
648 /* This is a new unit? Then let's add in some extras */
649 if (u
->load_state
== UNIT_LOADED
) {
650 r
= mount_add_extras(m
);
655 return mount_verify(m
);
658 static void mount_set_state(Mount
*m
, MountState state
) {
659 MountState old_state
;
662 old_state
= m
->state
;
665 if (!MOUNT_STATE_WITH_PROCESS(state
)) {
666 m
->timer_event_source
= sd_event_source_unref(m
->timer_event_source
);
667 mount_unwatch_control_pid(m
);
668 m
->control_command
= NULL
;
669 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
672 if (state
!= old_state
)
673 log_unit_debug(UNIT(m
), "Changed %s -> %s", mount_state_to_string(old_state
), mount_state_to_string(state
));
675 unit_notify(UNIT(m
), state_translation_table
[old_state
], state_translation_table
[state
], m
->reload_result
== MOUNT_SUCCESS
);
678 static int mount_coldplug(Unit
*u
) {
680 MountState new_state
= MOUNT_DEAD
;
684 assert(m
->state
== MOUNT_DEAD
);
686 if (m
->deserialized_state
!= m
->state
)
687 new_state
= m
->deserialized_state
;
688 else if (m
->from_proc_self_mountinfo
)
689 new_state
= MOUNT_MOUNTED
;
691 if (new_state
== m
->state
)
694 if (m
->control_pid
> 0 &&
695 pid_is_unwaited(m
->control_pid
) &&
696 MOUNT_STATE_WITH_PROCESS(new_state
)) {
698 r
= unit_watch_pid(UNIT(m
), m
->control_pid
);
702 r
= mount_arm_timer(m
, usec_add(u
->state_change_timestamp
.monotonic
, m
->timeout_usec
));
707 if (!IN_SET(new_state
, MOUNT_DEAD
, MOUNT_FAILED
))
708 (void) unit_setup_dynamic_creds(u
);
710 mount_set_state(m
, new_state
);
714 static void mount_dump(Unit
*u
, FILE *f
, const char *prefix
) {
721 p
= get_mount_parameters(m
);
724 "%sMount State: %s\n"
728 "%sFile System Type: %s\n"
730 "%sFrom /proc/self/mountinfo: %s\n"
731 "%sFrom fragment: %s\n"
733 "%sDirectoryMode: %04o\n"
734 "%sSloppyOptions: %s\n"
735 "%sLazyUnmount: %s\n"
736 "%sForceUnmount: %s\n",
737 prefix
, mount_state_to_string(m
->state
),
738 prefix
, mount_result_to_string(m
->result
),
740 prefix
, p
? strna(p
->what
) : "n/a",
741 prefix
, p
? strna(p
->fstype
) : "n/a",
742 prefix
, p
? strna(p
->options
) : "n/a",
743 prefix
, yes_no(m
->from_proc_self_mountinfo
),
744 prefix
, yes_no(m
->from_fragment
),
745 prefix
, yes_no(mount_is_extrinsic(m
)),
746 prefix
, m
->directory_mode
,
747 prefix
, yes_no(m
->sloppy_options
),
748 prefix
, yes_no(m
->lazy_unmount
),
749 prefix
, yes_no(m
->force_unmount
));
751 if (m
->control_pid
> 0)
753 "%sControl PID: "PID_FMT
"\n",
754 prefix
, m
->control_pid
);
756 exec_context_dump(&m
->exec_context
, f
, prefix
);
757 kill_context_dump(&m
->kill_context
, f
, prefix
);
758 cgroup_context_dump(&m
->cgroup_context
, f
, prefix
);
761 static int mount_spawn(Mount
*m
, ExecCommand
*c
, pid_t
*_pid
) {
764 ExecParameters exec_params
= {
765 .flags
= EXEC_APPLY_SANDBOXING
|EXEC_APPLY_CHROOT
|EXEC_APPLY_TTY_STDIN
,
775 (void) unit_realize_cgroup(UNIT(m
));
776 if (m
->reset_accounting
) {
777 (void) unit_reset_cpu_accounting(UNIT(m
));
778 (void) unit_reset_ip_accounting(UNIT(m
));
779 m
->reset_accounting
= false;
782 r
= unit_setup_exec_runtime(UNIT(m
));
786 r
= unit_setup_dynamic_creds(UNIT(m
));
790 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
794 manager_set_exec_params(UNIT(m
)->manager
, &exec_params
);
795 unit_set_exec_params(UNIT(m
), &exec_params
);
797 r
= exec_spawn(UNIT(m
),
807 r
= unit_watch_pid(UNIT(m
), pid
);
809 /* FIXME: we need to do something here */
817 static void mount_enter_dead(Mount
*m
, MountResult f
) {
820 if (m
->result
== MOUNT_SUCCESS
)
823 if (m
->result
!= MOUNT_SUCCESS
)
824 log_unit_warning(UNIT(m
), "Failed with result '%s'.", mount_result_to_string(m
->result
));
826 mount_set_state(m
, m
->result
!= MOUNT_SUCCESS
? MOUNT_FAILED
: MOUNT_DEAD
);
828 exec_runtime_destroy(m
->exec_runtime
);
829 m
->exec_runtime
= exec_runtime_unref(m
->exec_runtime
);
831 exec_context_destroy_runtime_directory(&m
->exec_context
, UNIT(m
)->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
833 unit_unref_uid_gid(UNIT(m
), true);
835 dynamic_creds_destroy(&m
->dynamic_creds
);
838 static void mount_enter_mounted(Mount
*m
, MountResult f
) {
841 if (m
->result
== MOUNT_SUCCESS
)
844 mount_set_state(m
, MOUNT_MOUNTED
);
847 static void mount_enter_dead_or_mounted(Mount
*m
, MountResult f
) {
850 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
851 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
852 * ultimately we just mirror the kernel's internal state on this. */
854 if (m
->from_proc_self_mountinfo
)
855 mount_enter_mounted(m
, f
);
857 mount_enter_dead(m
, f
);
860 static int state_to_kill_operation(MountState state
) {
863 case MOUNT_REMOUNTING_SIGTERM
:
864 case MOUNT_UNMOUNTING_SIGTERM
:
865 return KILL_TERMINATE
;
867 case MOUNT_REMOUNTING_SIGKILL
:
868 case MOUNT_UNMOUNTING_SIGKILL
:
872 return _KILL_OPERATION_INVALID
;
876 static void mount_enter_signal(Mount
*m
, MountState state
, MountResult f
) {
881 if (m
->result
== MOUNT_SUCCESS
)
884 r
= unit_kill_context(
887 state_to_kill_operation(state
),
895 r
= mount_arm_timer(m
, usec_add(now(CLOCK_MONOTONIC
), m
->timeout_usec
));
899 mount_set_state(m
, state
);
900 } else if (state
== MOUNT_REMOUNTING_SIGTERM
&& m
->kill_context
.send_sigkill
)
901 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
902 else if (IN_SET(state
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_REMOUNTING_SIGKILL
))
903 mount_enter_mounted(m
, MOUNT_SUCCESS
);
904 else if (state
== MOUNT_UNMOUNTING_SIGTERM
&& m
->kill_context
.send_sigkill
)
905 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
907 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
912 log_unit_warning_errno(UNIT(m
), r
, "Failed to kill processes: %m");
913 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
916 static void mount_enter_unmounting(Mount
*m
) {
921 /* Start counting our attempts */
922 if (!IN_SET(m
->state
,
924 MOUNT_UNMOUNTING_SIGTERM
,
925 MOUNT_UNMOUNTING_SIGKILL
))
926 m
->n_retry_umount
= 0;
928 m
->control_command_id
= MOUNT_EXEC_UNMOUNT
;
929 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_UNMOUNT
;
931 r
= exec_command_set(m
->control_command
, UMOUNT_PATH
, m
->where
, "-c", NULL
);
932 if (r
>= 0 && m
->lazy_unmount
)
933 r
= exec_command_append(m
->control_command
, "-l", NULL
);
934 if (r
>= 0 && m
->force_unmount
)
935 r
= exec_command_append(m
->control_command
, "-f", NULL
);
939 mount_unwatch_control_pid(m
);
941 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
945 mount_set_state(m
, MOUNT_UNMOUNTING
);
950 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'umount' task: %m");
951 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
954 static void mount_enter_mounting(Mount
*m
) {
960 m
->control_command_id
= MOUNT_EXEC_MOUNT
;
961 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_MOUNT
;
963 r
= unit_fail_if_symlink(UNIT(m
), m
->where
);
967 (void) mkdir_p_label(m
->where
, m
->directory_mode
);
969 unit_warn_if_dir_nonempty(UNIT(m
), m
->where
);
971 /* Create the source directory for bind-mounts if needed */
972 p
= get_mount_parameters_fragment(m
);
973 if (p
&& mount_is_bind(p
))
974 (void) mkdir_p_label(p
->what
, m
->directory_mode
);
977 _cleanup_free_
char *opts
= NULL
;
979 r
= fstab_filter_options(p
->options
, "nofail\0" "noauto\0" "auto\0", NULL
, NULL
, &opts
);
983 r
= exec_command_set(m
->control_command
, MOUNT_PATH
, p
->what
, m
->where
, NULL
);
984 if (r
>= 0 && m
->sloppy_options
)
985 r
= exec_command_append(m
->control_command
, "-s", NULL
);
986 if (r
>= 0 && p
->fstype
)
987 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
988 if (r
>= 0 && !isempty(opts
))
989 r
= exec_command_append(m
->control_command
, "-o", opts
, NULL
);
995 mount_unwatch_control_pid(m
);
997 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
1001 mount_set_state(m
, MOUNT_MOUNTING
);
1006 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'mount' task: %m");
1007 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_RESOURCES
);
1010 static void mount_set_reload_result(Mount
*m
, MountResult result
) {
1013 /* Only store the first error we encounter */
1014 if (m
->reload_result
!= MOUNT_SUCCESS
)
1017 m
->reload_result
= result
;
1020 static void mount_enter_remounting(Mount
*m
) {
1026 /* Reset reload result when we are about to start a new remount operation */
1027 m
->reload_result
= MOUNT_SUCCESS
;
1029 m
->control_command_id
= MOUNT_EXEC_REMOUNT
;
1030 m
->control_command
= m
->exec_command
+ MOUNT_EXEC_REMOUNT
;
1032 p
= get_mount_parameters_fragment(m
);
1037 o
= strjoina("remount,", p
->options
);
1041 r
= exec_command_set(m
->control_command
, MOUNT_PATH
,
1044 if (r
>= 0 && m
->sloppy_options
)
1045 r
= exec_command_append(m
->control_command
, "-s", NULL
);
1046 if (r
>= 0 && p
->fstype
)
1047 r
= exec_command_append(m
->control_command
, "-t", p
->fstype
, NULL
);
1053 mount_unwatch_control_pid(m
);
1055 r
= mount_spawn(m
, m
->control_command
, &m
->control_pid
);
1059 mount_set_state(m
, MOUNT_REMOUNTING
);
1064 log_unit_warning_errno(UNIT(m
), r
, "Failed to run 'remount' task: %m");
1065 mount_set_reload_result(m
, MOUNT_FAILURE_RESOURCES
);
1066 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1069 static int mount_start(Unit
*u
) {
1070 Mount
*m
= MOUNT(u
);
1075 /* We cannot fulfill this request right now, try again later
1077 if (IN_SET(m
->state
,
1079 MOUNT_UNMOUNTING_SIGTERM
,
1080 MOUNT_UNMOUNTING_SIGKILL
))
1083 /* Already on it! */
1084 if (m
->state
== MOUNT_MOUNTING
)
1087 assert(IN_SET(m
->state
, MOUNT_DEAD
, MOUNT_FAILED
));
1089 r
= unit_start_limit_test(u
);
1091 mount_enter_dead(m
, MOUNT_FAILURE_START_LIMIT_HIT
);
1095 r
= unit_acquire_invocation_id(u
);
1099 m
->result
= MOUNT_SUCCESS
;
1100 m
->reload_result
= MOUNT_SUCCESS
;
1101 m
->reset_accounting
= true;
1103 mount_enter_mounting(m
);
1107 static int mount_stop(Unit
*u
) {
1108 Mount
*m
= MOUNT(u
);
1114 case MOUNT_UNMOUNTING
:
1115 case MOUNT_UNMOUNTING_SIGKILL
:
1116 case MOUNT_UNMOUNTING_SIGTERM
:
1120 case MOUNT_MOUNTING
:
1121 case MOUNT_MOUNTING_DONE
:
1122 case MOUNT_REMOUNTING
:
1123 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1124 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_SUCCESS
);
1127 case MOUNT_REMOUNTING_SIGTERM
:
1128 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1129 mount_set_state(m
, MOUNT_UNMOUNTING_SIGTERM
);
1132 case MOUNT_REMOUNTING_SIGKILL
:
1134 mount_set_state(m
, MOUNT_UNMOUNTING_SIGKILL
);
1138 mount_enter_unmounting(m
);
1142 assert_not_reached("Unexpected state.");
1146 static int mount_reload(Unit
*u
) {
1147 Mount
*m
= MOUNT(u
);
1151 if (m
->state
== MOUNT_MOUNTING_DONE
) /* not yet ready to reload, try again */
1154 assert(m
->state
== MOUNT_MOUNTED
);
1156 mount_enter_remounting(m
);
1161 static int mount_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
1162 Mount
*m
= MOUNT(u
);
1168 unit_serialize_item(u
, f
, "state", mount_state_to_string(m
->state
));
1169 unit_serialize_item(u
, f
, "result", mount_result_to_string(m
->result
));
1170 unit_serialize_item(u
, f
, "reload-result", mount_result_to_string(m
->reload_result
));
1172 if (m
->control_pid
> 0)
1173 unit_serialize_item_format(u
, f
, "control-pid", PID_FMT
, m
->control_pid
);
1175 if (m
->control_command_id
>= 0)
1176 unit_serialize_item(u
, f
, "control-command", mount_exec_command_to_string(m
->control_command_id
));
1181 static int mount_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
1182 Mount
*m
= MOUNT(u
);
1189 if (streq(key
, "state")) {
1192 if ((state
= mount_state_from_string(value
)) < 0)
1193 log_unit_debug(u
, "Failed to parse state value: %s", value
);
1195 m
->deserialized_state
= state
;
1196 } else if (streq(key
, "result")) {
1199 f
= mount_result_from_string(value
);
1201 log_unit_debug(u
, "Failed to parse result value: %s", value
);
1202 else if (f
!= MOUNT_SUCCESS
)
1205 } else if (streq(key
, "reload-result")) {
1208 f
= mount_result_from_string(value
);
1210 log_unit_debug(u
, "Failed to parse reload result value: %s", value
);
1211 else if (f
!= MOUNT_SUCCESS
)
1212 m
->reload_result
= f
;
1214 } else if (streq(key
, "control-pid")) {
1217 if (parse_pid(value
, &pid
) < 0)
1218 log_unit_debug(u
, "Failed to parse control-pid value: %s", value
);
1220 m
->control_pid
= pid
;
1221 } else if (streq(key
, "control-command")) {
1222 MountExecCommand id
;
1224 id
= mount_exec_command_from_string(value
);
1226 log_unit_debug(u
, "Failed to parse exec-command value: %s", value
);
1228 m
->control_command_id
= id
;
1229 m
->control_command
= m
->exec_command
+ id
;
1232 log_unit_debug(u
, "Unknown serialization key: %s", key
);
1237 _pure_
static UnitActiveState
mount_active_state(Unit
*u
) {
1240 return state_translation_table
[MOUNT(u
)->state
];
1243 _pure_
static const char *mount_sub_state_to_string(Unit
*u
) {
1246 return mount_state_to_string(MOUNT(u
)->state
);
1249 _pure_
static bool mount_check_gc(Unit
*u
) {
1250 Mount
*m
= MOUNT(u
);
1254 return m
->from_proc_self_mountinfo
;
1257 static void mount_sigchld_event(Unit
*u
, pid_t pid
, int code
, int status
) {
1258 Mount
*m
= MOUNT(u
);
1264 if (pid
!= m
->control_pid
)
1269 if (is_clean_exit(code
, status
, EXIT_CLEAN_COMMAND
, NULL
))
1271 else if (code
== CLD_EXITED
)
1272 f
= MOUNT_FAILURE_EXIT_CODE
;
1273 else if (code
== CLD_KILLED
)
1274 f
= MOUNT_FAILURE_SIGNAL
;
1275 else if (code
== CLD_DUMPED
)
1276 f
= MOUNT_FAILURE_CORE_DUMP
;
1278 assert_not_reached("Unknown code");
1280 if (IN_SET(m
->state
, MOUNT_REMOUNTING
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_REMOUNTING_SIGTERM
))
1281 mount_set_reload_result(m
, f
);
1282 else if (m
->result
== MOUNT_SUCCESS
)
1285 if (m
->control_command
) {
1286 exec_status_exit(&m
->control_command
->exec_status
, &m
->exec_context
, pid
, code
, status
);
1288 m
->control_command
= NULL
;
1289 m
->control_command_id
= _MOUNT_EXEC_COMMAND_INVALID
;
1292 log_unit_full(u
, f
== MOUNT_SUCCESS
? LOG_DEBUG
: LOG_NOTICE
, 0,
1293 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code
), status
);
1295 /* Note that mount(8) returning and the kernel sending us a mount table change event might happen
1296 * out-of-order. If an operation succeed we assume the kernel will follow soon too and already change into the
1297 * resulting state. If it fails we check if the kernel still knows about the mount. and change state
1302 case MOUNT_MOUNTING
:
1303 case MOUNT_MOUNTING_DONE
:
1305 if (f
== MOUNT_SUCCESS
|| m
->from_proc_self_mountinfo
)
1306 /* If /bin/mount returned success, or if we see the mount point in /proc/self/mountinfo we are
1307 * happy. If we see the first condition first, we should see the second condition
1308 * immediately after – or /bin/mount lies to us and is broken. */
1309 mount_enter_mounted(m
, f
);
1311 mount_enter_dead(m
, f
);
1314 case MOUNT_REMOUNTING
:
1315 case MOUNT_REMOUNTING_SIGTERM
:
1316 case MOUNT_REMOUNTING_SIGKILL
:
1317 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1320 case MOUNT_UNMOUNTING
:
1321 case MOUNT_UNMOUNTING_SIGKILL
:
1322 case MOUNT_UNMOUNTING_SIGTERM
:
1324 if (m
->from_proc_self_mountinfo
) {
1326 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1327 * stacked on top of each other. Note that due to the io event priority logic we can be sure
1328 * the new mountinfo is loaded before we process the SIGCHLD for the mount command. */
1330 if (m
->n_retry_umount
< RETRY_UMOUNT_MAX
) {
1331 log_unit_debug(u
, "Mount still present, trying again.");
1332 m
->n_retry_umount
++;
1333 mount_enter_unmounting(m
);
1335 log_unit_debug(u
, "Mount still present after %u attempts to unmount, giving up.", m
->n_retry_umount
);
1336 mount_enter_mounted(m
, f
);
1339 mount_enter_dead(m
, f
);
1344 assert_not_reached("Uh, control process died at wrong time.");
1347 /* Notify clients about changed exit status */
1348 unit_add_to_dbus_queue(u
);
1351 static int mount_dispatch_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
1352 Mount
*m
= MOUNT(userdata
);
1355 assert(m
->timer_event_source
== source
);
1359 case MOUNT_MOUNTING
:
1360 case MOUNT_MOUNTING_DONE
:
1361 log_unit_warning(UNIT(m
), "Mounting timed out. Terminating.");
1362 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1365 case MOUNT_REMOUNTING
:
1366 log_unit_warning(UNIT(m
), "Remounting timed out. Killing remount process.");
1367 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1368 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGTERM
, MOUNT_SUCCESS
);
1371 case MOUNT_REMOUNTING_SIGTERM
:
1372 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1374 if (m
->kill_context
.send_sigkill
) {
1375 log_unit_warning(UNIT(m
), "Remounting timed out. Killing.");
1376 mount_enter_signal(m
, MOUNT_REMOUNTING_SIGKILL
, MOUNT_SUCCESS
);
1378 log_unit_warning(UNIT(m
), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1379 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1383 case MOUNT_REMOUNTING_SIGKILL
:
1384 mount_set_reload_result(m
, MOUNT_FAILURE_TIMEOUT
);
1386 log_unit_warning(UNIT(m
), "Mount process still around after SIGKILL. Ignoring.");
1387 mount_enter_dead_or_mounted(m
, MOUNT_SUCCESS
);
1390 case MOUNT_UNMOUNTING
:
1391 log_unit_warning(UNIT(m
), "Unmounting timed out. Stopping.");
1392 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGTERM
, MOUNT_FAILURE_TIMEOUT
);
1395 case MOUNT_UNMOUNTING_SIGTERM
:
1396 if (m
->kill_context
.send_sigkill
) {
1397 log_unit_warning(UNIT(m
), "Mount process timed out. Killing.");
1398 mount_enter_signal(m
, MOUNT_UNMOUNTING_SIGKILL
, MOUNT_FAILURE_TIMEOUT
);
1400 log_unit_warning(UNIT(m
), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1401 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1405 case MOUNT_UNMOUNTING_SIGKILL
:
1406 log_unit_warning(UNIT(m
), "Mount process still around after SIGKILL. Ignoring.");
1407 mount_enter_dead_or_mounted(m
, MOUNT_FAILURE_TIMEOUT
);
1411 assert_not_reached("Timeout at wrong time.");
1423 static int mount_setup_new_unit(
1427 const char *options
,
1429 MountSetupFlags
*flags
) {
1436 u
->source_path
= strdup("/proc/self/mountinfo");
1437 MOUNT(u
)->where
= strdup(where
);
1438 if (!u
->source_path
|| !MOUNT(u
)->where
)
1441 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1442 MOUNT(u
)->from_proc_self_mountinfo
= true;
1443 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1445 p
->what
= strdup(what
);
1446 p
->options
= strdup(options
);
1447 p
->fstype
= strdup(fstype
);
1448 if (!p
->what
|| !p
->options
|| !p
->fstype
)
1451 if (!mount_is_extrinsic(MOUNT(u
))) {
1455 target
= mount_is_network(p
) ? SPECIAL_REMOTE_FS_TARGET
: SPECIAL_LOCAL_FS_TARGET
;
1456 r
= unit_add_dependency_by_name(u
, UNIT_BEFORE
, target
, NULL
, true);
1460 r
= unit_add_dependency_by_name(u
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true);
1465 unit_add_to_load_queue(u
);
1466 flags
->is_mounted
= true;
1467 flags
->just_mounted
= true;
1468 flags
->just_changed
= true;
1473 static int mount_setup_existing_unit(
1477 const char *options
,
1479 MountSetupFlags
*flags
) {
1482 bool load_extras
= false;
1488 if (!MOUNT(u
)->where
) {
1489 MOUNT(u
)->where
= strdup(where
);
1490 if (!MOUNT(u
)->where
)
1494 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1495 p
= &MOUNT(u
)->parameters_proc_self_mountinfo
;
1497 r1
= free_and_strdup(&p
->what
, what
);
1498 r2
= free_and_strdup(&p
->options
, options
);
1499 r3
= free_and_strdup(&p
->fstype
, fstype
);
1500 if (r1
< 0 || r2
< 0 || r3
< 0)
1503 flags
->just_changed
= r1
> 0 || r2
> 0 || r3
> 0;
1504 flags
->is_mounted
= true;
1505 flags
->just_mounted
= !MOUNT(u
)->from_proc_self_mountinfo
;
1507 MOUNT(u
)->from_proc_self_mountinfo
= true;
1509 if (!mount_is_extrinsic(MOUNT(u
)) && mount_is_network(p
)) {
1510 /* _netdev option may have shown up late, or on a
1511 * remount. Add remote-fs dependencies, even though
1512 * local-fs ones may already be there.
1514 * Note: due to a current limitation (we don't track
1515 * in the dependency "Set*" objects who created a
1516 * dependency), we can only add deps, never lose them,
1517 * until the next full daemon-reload. */
1518 unit_add_dependency_by_name(u
, UNIT_BEFORE
, SPECIAL_REMOTE_FS_TARGET
, NULL
, true);
1522 if (u
->load_state
== UNIT_NOT_FOUND
) {
1523 u
->load_state
= UNIT_LOADED
;
1526 /* Load in the extras later on, after we
1527 * finished initialization of the unit */
1529 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1531 flags
->just_changed
= true;
1535 return mount_add_extras(MOUNT(u
));
1540 static int mount_setup_unit(
1544 const char *options
,
1548 _cleanup_free_
char *e
= NULL
;
1549 MountSetupFlags flags
;
1559 /* Ignore API mount points. They should never be referenced in
1560 * dependencies ever. */
1561 if (mount_point_is_api(where
) || mount_point_ignore(where
))
1564 if (streq(fstype
, "autofs"))
1567 /* probably some kind of swap, ignore */
1568 if (!is_path(where
))
1571 r
= unit_name_from_path(where
, ".mount", &e
);
1575 u
= manager_get_unit(m
, e
);
1577 /* First time we see this mount point meaning that it's
1578 * not been initiated by a mount unit but rather by the
1579 * sysadmin having called mount(8) directly. */
1580 r
= unit_new_for_name(m
, sizeof(Mount
), e
, &u
);
1584 r
= mount_setup_new_unit(u
, what
, where
, options
, fstype
, &flags
);
1588 r
= mount_setup_existing_unit(u
, what
, where
, options
, fstype
, &flags
);
1594 MOUNT(u
)->is_mounted
= flags
.is_mounted
;
1595 MOUNT(u
)->just_mounted
= flags
.just_mounted
;
1596 MOUNT(u
)->just_changed
= flags
.just_changed
;
1599 if (flags
.just_changed
)
1600 unit_add_to_dbus_queue(u
);
1604 log_warning_errno(r
, "Failed to set up mount unit: %m");
1608 static int mount_load_proc_self_mountinfo(Manager
*m
, bool set_flags
) {
1609 _cleanup_(mnt_free_tablep
) struct libmnt_table
*t
= NULL
;
1610 _cleanup_(mnt_free_iterp
) struct libmnt_iter
*i
= NULL
;
1615 t
= mnt_new_table();
1619 i
= mnt_new_iter(MNT_ITER_FORWARD
);
1623 r
= mnt_table_parse_mtab(t
, NULL
);
1625 return log_error_errno(r
, "Failed to parse /proc/self/mountinfo: %m");
1629 const char *device
, *path
, *options
, *fstype
;
1630 _cleanup_free_
char *d
= NULL
, *p
= NULL
;
1631 struct libmnt_fs
*fs
;
1634 k
= mnt_table_next_fs(t
, i
, &fs
);
1638 return log_error_errno(k
, "Failed to get next entry from /proc/self/mountinfo: %m");
1640 device
= mnt_fs_get_source(fs
);
1641 path
= mnt_fs_get_target(fs
);
1642 options
= mnt_fs_get_options(fs
);
1643 fstype
= mnt_fs_get_fstype(fs
);
1645 if (!device
|| !path
)
1648 if (cunescape(device
, UNESCAPE_RELAX
, &d
) < 0)
1651 if (cunescape(path
, UNESCAPE_RELAX
, &p
) < 0)
1654 (void) device_found_node(m
, d
, true, DEVICE_FOUND_MOUNT
, set_flags
);
1656 k
= mount_setup_unit(m
, d
, p
, options
, fstype
, set_flags
);
1657 if (r
== 0 && k
< 0)
1664 static void mount_shutdown(Manager
*m
) {
1667 m
->mount_event_source
= sd_event_source_unref(m
->mount_event_source
);
1669 mnt_unref_monitor(m
->mount_monitor
);
1670 m
->mount_monitor
= NULL
;
1673 static int mount_get_timeout(Unit
*u
, usec_t
*timeout
) {
1674 Mount
*m
= MOUNT(u
);
1678 if (!m
->timer_event_source
)
1681 r
= sd_event_source_get_time(m
->timer_event_source
, &t
);
1684 if (t
== USEC_INFINITY
)
1691 static int synthesize_root_mount(Manager
*m
) {
1697 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1698 * unconditionally synthesize it here and mark it as perpetual. */
1700 u
= manager_get_unit(m
, SPECIAL_ROOT_MOUNT
);
1702 r
= unit_new_for_name(m
, sizeof(Mount
), SPECIAL_ROOT_MOUNT
, &u
);
1704 return log_error_errno(r
, "Failed to allocate the special " SPECIAL_ROOT_MOUNT
" unit: %m");
1707 u
->perpetual
= true;
1708 MOUNT(u
)->deserialized_state
= MOUNT_MOUNTED
;
1710 unit_add_to_load_queue(u
);
1711 unit_add_to_dbus_queue(u
);
1716 static bool mount_is_mounted(Mount
*m
) {
1719 return UNIT(m
)->perpetual
|| m
->is_mounted
;
1722 static void mount_enumerate(Manager
*m
) {
1727 r
= synthesize_root_mount(m
);
1733 if (!m
->mount_monitor
) {
1736 m
->mount_monitor
= mnt_new_monitor();
1737 if (!m
->mount_monitor
) {
1742 r
= mnt_monitor_enable_kernel(m
->mount_monitor
, 1);
1744 log_error_errno(r
, "Failed to enable watching of kernel mount events: %m");
1748 r
= mnt_monitor_enable_userspace(m
->mount_monitor
, 1, NULL
);
1750 log_error_errno(r
, "Failed to enable watching of userspace mount events: %m");
1754 /* mnt_unref_monitor() will close the fd */
1755 fd
= r
= mnt_monitor_get_fd(m
->mount_monitor
);
1757 log_error_errno(r
, "Failed to acquire watch file descriptor: %m");
1761 r
= sd_event_add_io(m
->event
, &m
->mount_event_source
, fd
, EPOLLIN
, mount_dispatch_io
, m
);
1763 log_error_errno(r
, "Failed to watch mount file descriptor: %m");
1767 r
= sd_event_source_set_priority(m
->mount_event_source
, -10);
1769 log_error_errno(r
, "Failed to adjust mount watch priority: %m");
1773 (void) sd_event_source_set_description(m
->mount_event_source
, "mount-monitor-dispatch");
1776 r
= mount_load_proc_self_mountinfo(m
, false);
1786 static int mount_dispatch_io(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
1787 _cleanup_set_free_ Set
*around
= NULL
, *gone
= NULL
;
1788 Manager
*m
= userdata
;
1795 assert(revents
& EPOLLIN
);
1797 if (fd
== mnt_monitor_get_fd(m
->mount_monitor
)) {
1798 bool rescan
= false;
1800 /* Drain all events and verify that the event is valid.
1802 * Note that libmount also monitors /run/mount mkdir if the
1803 * directory does not exist yet. The mkdir may generate event
1804 * which is irrelevant for us.
1806 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1808 r
= mnt_monitor_next_change(m
->mount_monitor
, NULL
, NULL
);
1812 return log_error_errno(r
, "Failed to drain libmount events");
1815 log_debug("libmount event [rescan: %s]", yes_no(rescan
));
1820 r
= mount_load_proc_self_mountinfo(m
, true);
1822 /* Reset flags, just in case, for later calls */
1823 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1824 Mount
*mount
= MOUNT(u
);
1826 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1832 manager_dispatch_load_queue(m
);
1834 LIST_FOREACH(units_by_type
, u
, m
->units_by_type
[UNIT_MOUNT
]) {
1835 Mount
*mount
= MOUNT(u
);
1837 if (!mount_is_mounted(mount
)) {
1839 /* A mount point is not around right now. It
1840 * might be gone, or might never have
1843 if (mount
->from_proc_self_mountinfo
&&
1844 mount
->parameters_proc_self_mountinfo
.what
) {
1846 /* Remember that this device might just have disappeared */
1847 if (set_ensure_allocated(&gone
, &string_hash_ops
) < 0 ||
1848 set_put(gone
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1849 log_oom(); /* we don't care too much about OOM here... */
1852 mount
->from_proc_self_mountinfo
= false;
1854 switch (mount
->state
) {
1857 /* This has just been unmounted by
1858 * somebody else, follow the state
1860 mount
->result
= MOUNT_SUCCESS
; /* make sure we forget any earlier umount failures */
1861 mount_enter_dead(mount
, MOUNT_SUCCESS
);
1868 } else if (mount
->just_mounted
|| mount
->just_changed
) {
1870 /* A mount point was added or changed */
1872 switch (mount
->state
) {
1877 /* This has just been mounted by somebody else, follow the state change, but let's
1878 * generate a new invocation ID for this implicitly and automatically. */
1879 (void) unit_acquire_invocation_id(UNIT(mount
));
1880 mount_enter_mounted(mount
, MOUNT_SUCCESS
);
1883 case MOUNT_MOUNTING
:
1884 mount_set_state(mount
, MOUNT_MOUNTING_DONE
);
1888 /* Nothing really changed, but let's
1889 * issue an notification call
1890 * nonetheless, in case somebody is
1891 * waiting for this. (e.g. file system
1892 * ro/rw remounts.) */
1893 mount_set_state(mount
, mount
->state
);
1898 if (mount_is_mounted(mount
) &&
1899 mount
->from_proc_self_mountinfo
&&
1900 mount
->parameters_proc_self_mountinfo
.what
) {
1902 if (set_ensure_allocated(&around
, &string_hash_ops
) < 0 ||
1903 set_put(around
, mount
->parameters_proc_self_mountinfo
.what
) < 0)
1907 /* Reset the flags for later calls */
1908 mount
->is_mounted
= mount
->just_mounted
= mount
->just_changed
= false;
1911 SET_FOREACH(what
, gone
, i
) {
1912 if (set_contains(around
, what
))
1915 /* Let the device units know that the device is no longer mounted */
1916 (void) device_found_node(m
, what
, false, DEVICE_FOUND_MOUNT
, true);
1922 static void mount_reset_failed(Unit
*u
) {
1923 Mount
*m
= MOUNT(u
);
1927 if (m
->state
== MOUNT_FAILED
)
1928 mount_set_state(m
, MOUNT_DEAD
);
1930 m
->result
= MOUNT_SUCCESS
;
1931 m
->reload_result
= MOUNT_SUCCESS
;
1934 static int mount_kill(Unit
*u
, KillWho who
, int signo
, sd_bus_error
*error
) {
1935 Mount
*m
= MOUNT(u
);
1939 return unit_kill_common(u
, who
, signo
, -1, MOUNT(u
)->control_pid
, error
);
1942 static int mount_control_pid(Unit
*u
) {
1943 Mount
*m
= MOUNT(u
);
1947 return m
->control_pid
;
1950 static const char* const mount_exec_command_table
[_MOUNT_EXEC_COMMAND_MAX
] = {
1951 [MOUNT_EXEC_MOUNT
] = "ExecMount",
1952 [MOUNT_EXEC_UNMOUNT
] = "ExecUnmount",
1953 [MOUNT_EXEC_REMOUNT
] = "ExecRemount",
1956 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command
, MountExecCommand
);
1958 static const char* const mount_result_table
[_MOUNT_RESULT_MAX
] = {
1959 [MOUNT_SUCCESS
] = "success",
1960 [MOUNT_FAILURE_RESOURCES
] = "resources",
1961 [MOUNT_FAILURE_TIMEOUT
] = "timeout",
1962 [MOUNT_FAILURE_EXIT_CODE
] = "exit-code",
1963 [MOUNT_FAILURE_SIGNAL
] = "signal",
1964 [MOUNT_FAILURE_CORE_DUMP
] = "core-dump",
1965 [MOUNT_FAILURE_START_LIMIT_HIT
] = "start-limit-hit",
1968 DEFINE_STRING_TABLE_LOOKUP(mount_result
, MountResult
);
1970 const UnitVTable mount_vtable
= {
1971 .object_size
= sizeof(Mount
),
1972 .exec_context_offset
= offsetof(Mount
, exec_context
),
1973 .cgroup_context_offset
= offsetof(Mount
, cgroup_context
),
1974 .kill_context_offset
= offsetof(Mount
, kill_context
),
1975 .exec_runtime_offset
= offsetof(Mount
, exec_runtime
),
1976 .dynamic_creds_offset
= offsetof(Mount
, dynamic_creds
),
1982 .private_section
= "Mount",
1988 .coldplug
= mount_coldplug
,
1992 .start
= mount_start
,
1994 .reload
= mount_reload
,
1998 .serialize
= mount_serialize
,
1999 .deserialize_item
= mount_deserialize_item
,
2001 .active_state
= mount_active_state
,
2002 .sub_state_to_string
= mount_sub_state_to_string
,
2004 .check_gc
= mount_check_gc
,
2006 .sigchld_event
= mount_sigchld_event
,
2008 .reset_failed
= mount_reset_failed
,
2010 .control_pid
= mount_control_pid
,
2012 .bus_vtable
= bus_mount_vtable
,
2013 .bus_set_property
= bus_mount_set_property
,
2014 .bus_commit_properties
= bus_mount_commit_properties
,
2016 .get_timeout
= mount_get_timeout
,
2018 .can_transient
= true,
2020 .enumerate
= mount_enumerate
,
2021 .shutdown
= mount_shutdown
,
2023 .status_message_formats
= {
2024 .starting_stopping
= {
2025 [0] = "Mounting %s...",
2026 [1] = "Unmounting %s...",
2028 .finished_start_job
= {
2029 [JOB_DONE
] = "Mounted %s.",
2030 [JOB_FAILED
] = "Failed to mount %s.",
2031 [JOB_TIMEOUT
] = "Timed out mounting %s.",
2033 .finished_stop_job
= {
2034 [JOB_DONE
] = "Unmounted %s.",
2035 [JOB_FAILED
] = "Failed unmounting %s.",
2036 [JOB_TIMEOUT
] = "Timed out unmounting %s.",