1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include <sys/mount.h>
27 #include <sys/epoll.h>
29 #include <linux/auto_fs4.h>
30 #include <linux/auto_dev-ioctl.h>
33 #include "automount.h"
34 #include "load-fragment.h"
35 #include "load-dropin.h"
36 #include "unit-name.h"
37 #include "dbus-automount.h"
38 #include "bus-errors.h"
42 static const UnitActiveState state_translation_table
[_AUTOMOUNT_STATE_MAX
] = {
43 [AUTOMOUNT_DEAD
] = UNIT_INACTIVE
,
44 [AUTOMOUNT_WAITING
] = UNIT_ACTIVE
,
45 [AUTOMOUNT_RUNNING
] = UNIT_ACTIVE
,
46 [AUTOMOUNT_FAILED
] = UNIT_FAILED
49 static int open_dev_autofs(Manager
*m
);
51 static void automount_init(Unit
*u
) {
52 Automount
*a
= AUTOMOUNT(u
);
55 assert(u
->meta
.load_state
== UNIT_STUB
);
57 a
->pipe_watch
.fd
= a
->pipe_fd
= -1;
58 a
->pipe_watch
.type
= WATCH_INVALID
;
60 a
->directory_mode
= 0755;
63 static void repeat_unmout(const char *path
) {
67 /* If there are multiple mounts on a mount point, this
70 if (umount2(path
, MNT_DETACH
) >= 0)
74 log_error("Failed to unmount: %m");
80 static void unmount_autofs(Automount
*a
) {
86 automount_send_ready(a
, -EHOSTDOWN
);
88 unit_unwatch_fd(UNIT(a
), &a
->pipe_watch
);
89 close_nointr_nofail(a
->pipe_fd
);
92 /* If we reload/reexecute things we keep the mount point
95 (a
->meta
.manager
->exit_code
!= MANAGER_RELOAD
&&
96 a
->meta
.manager
->exit_code
!= MANAGER_REEXECUTE
))
97 repeat_unmout(a
->where
);
100 static void automount_done(Unit
*u
) {
101 Automount
*a
= AUTOMOUNT(u
);
115 int automount_add_one_mount_link(Automount
*a
, Mount
*m
) {
121 if (a
->meta
.load_state
!= UNIT_LOADED
||
122 m
->meta
.load_state
!= UNIT_LOADED
)
125 if (!path_startswith(a
->where
, m
->where
))
128 if (path_equal(a
->where
, m
->where
))
131 if ((r
= unit_add_two_dependencies(UNIT(a
), UNIT_AFTER
, UNIT_REQUIRES
, UNIT(m
), true)) < 0)
137 static int automount_add_mount_links(Automount
*a
) {
143 LIST_FOREACH(units_per_type
, other
, a
->meta
.manager
->units_per_type
[UNIT_MOUNT
])
144 if ((r
= automount_add_one_mount_link(a
, (Mount
*) other
)) < 0)
150 static int automount_add_default_dependencies(Automount
*a
) {
155 if (a
->meta
.manager
->running_as
== MANAGER_SYSTEM
) {
157 if ((r
= unit_add_dependency_by_name(UNIT(a
), UNIT_BEFORE
, SPECIAL_BASIC_TARGET
, NULL
, true)) < 0)
160 if ((r
= unit_add_two_dependencies_by_name(UNIT(a
), UNIT_BEFORE
, UNIT_CONFLICTS
, SPECIAL_UMOUNT_TARGET
, NULL
, true)) < 0)
167 static int automount_verify(Automount
*a
) {
172 if (a
->meta
.load_state
!= UNIT_LOADED
)
175 if (path_equal(a
->where
, "/")) {
176 log_error("Cannot have an automount unit for the root directory. Refusing.");
180 if (!(e
= unit_name_from_path(a
->where
, ".automount")))
183 b
= unit_has_name(UNIT(a
), e
);
187 log_error("%s's Where setting doesn't match unit name. Refusing.", a
->meta
.id
);
194 static int automount_load(Unit
*u
) {
196 Automount
*a
= AUTOMOUNT(u
);
199 assert(u
->meta
.load_state
== UNIT_STUB
);
201 /* Load a .automount file */
202 if ((r
= unit_load_fragment_and_dropin_optional(u
)) < 0)
205 if (u
->meta
.load_state
== UNIT_LOADED
) {
208 if (!(a
->where
= unit_name_to_path(u
->meta
.id
)))
211 path_kill_slashes(a
->where
);
213 if ((r
= automount_add_mount_links(a
)) < 0)
216 if ((r
= unit_load_related_unit(u
, ".mount", (Unit
**) &a
->mount
)) < 0)
219 if ((r
= unit_add_dependency(u
, UNIT_BEFORE
, UNIT(a
->mount
), true)) < 0)
222 if (a
->meta
.default_dependencies
)
223 if ((r
= automount_add_default_dependencies(a
)) < 0)
227 return automount_verify(a
);
230 static void automount_set_state(Automount
*a
, AutomountState state
) {
231 AutomountState old_state
;
234 old_state
= a
->state
;
237 if (state
!= AUTOMOUNT_WAITING
&&
238 state
!= AUTOMOUNT_RUNNING
)
241 if (state
!= old_state
)
242 log_debug("%s changed %s -> %s",
244 automount_state_to_string(old_state
),
245 automount_state_to_string(state
));
247 unit_notify(UNIT(a
), state_translation_table
[old_state
], state_translation_table
[state
], true);
250 static int automount_coldplug(Unit
*u
) {
251 Automount
*a
= AUTOMOUNT(u
);
255 assert(a
->state
== AUTOMOUNT_DEAD
);
257 if (a
->deserialized_state
!= a
->state
) {
259 if ((r
= open_dev_autofs(u
->meta
.manager
)) < 0)
262 if (a
->deserialized_state
== AUTOMOUNT_WAITING
||
263 a
->deserialized_state
== AUTOMOUNT_RUNNING
) {
265 assert(a
->pipe_fd
>= 0);
267 if ((r
= unit_watch_fd(UNIT(a
), a
->pipe_fd
, EPOLLIN
, &a
->pipe_watch
)) < 0)
271 automount_set_state(a
, a
->deserialized_state
);
277 static void automount_dump(Unit
*u
, FILE *f
, const char *prefix
) {
278 Automount
*a
= AUTOMOUNT(u
);
283 "%sAutomount State: %s\n"
285 "%sDirectoryMode: %04o\n",
286 prefix
, automount_state_to_string(a
->state
),
288 prefix
, a
->directory_mode
);
291 static void automount_enter_dead(Automount
*a
, bool success
) {
297 automount_set_state(a
, a
->failure
? AUTOMOUNT_FAILED
: AUTOMOUNT_DEAD
);
300 static int open_dev_autofs(Manager
*m
) {
301 struct autofs_dev_ioctl param
;
305 if (m
->dev_autofs_fd
>= 0)
306 return m
->dev_autofs_fd
;
308 label_fix("/dev/autofs", false);
310 if ((m
->dev_autofs_fd
= open("/dev/autofs", O_CLOEXEC
|O_RDONLY
)) < 0) {
311 log_error("Failed to open /dev/autofs: %s", strerror(errno
));
315 init_autofs_dev_ioctl(¶m
);
316 if (ioctl(m
->dev_autofs_fd
, AUTOFS_DEV_IOCTL_VERSION
, ¶m
) < 0) {
317 close_nointr_nofail(m
->dev_autofs_fd
);
318 m
->dev_autofs_fd
= -1;
322 log_debug("Autofs kernel version %i.%i", param
.ver_major
, param
.ver_minor
);
324 return m
->dev_autofs_fd
;
327 static int open_ioctl_fd(int dev_autofs_fd
, const char *where
, dev_t devid
) {
328 struct autofs_dev_ioctl
*param
;
332 assert(dev_autofs_fd
>= 0);
335 l
= sizeof(struct autofs_dev_ioctl
) + strlen(where
) + 1;
337 if (!(param
= malloc(l
)))
340 init_autofs_dev_ioctl(param
);
343 param
->openmount
.devid
= devid
;
344 strcpy(param
->path
, where
);
346 if (ioctl(dev_autofs_fd
, AUTOFS_DEV_IOCTL_OPENMOUNT
, param
) < 0) {
351 if (param
->ioctlfd
< 0) {
356 fd_cloexec(param
->ioctlfd
, true);
364 static int autofs_protocol(int dev_autofs_fd
, int ioctl_fd
) {
365 uint32_t major
, minor
;
366 struct autofs_dev_ioctl param
;
368 assert(dev_autofs_fd
>= 0);
369 assert(ioctl_fd
>= 0);
371 init_autofs_dev_ioctl(¶m
);
372 param
.ioctlfd
= ioctl_fd
;
374 if (ioctl(dev_autofs_fd
, AUTOFS_DEV_IOCTL_PROTOVER
, ¶m
) < 0)
377 major
= param
.protover
.version
;
379 init_autofs_dev_ioctl(¶m
);
380 param
.ioctlfd
= ioctl_fd
;
382 if (ioctl(dev_autofs_fd
, AUTOFS_DEV_IOCTL_PROTOSUBVER
, ¶m
) < 0)
385 minor
= param
.protosubver
.sub_version
;
387 log_debug("Autofs protocol version %i.%i", major
, minor
);
391 static int autofs_set_timeout(int dev_autofs_fd
, int ioctl_fd
, time_t sec
) {
392 struct autofs_dev_ioctl param
;
394 assert(dev_autofs_fd
>= 0);
395 assert(ioctl_fd
>= 0);
397 init_autofs_dev_ioctl(¶m
);
398 param
.ioctlfd
= ioctl_fd
;
399 param
.timeout
.timeout
= sec
;
401 if (ioctl(dev_autofs_fd
, AUTOFS_DEV_IOCTL_TIMEOUT
, ¶m
) < 0)
407 static int autofs_send_ready(int dev_autofs_fd
, int ioctl_fd
, uint32_t token
, int status
) {
408 struct autofs_dev_ioctl param
;
410 assert(dev_autofs_fd
>= 0);
411 assert(ioctl_fd
>= 0);
413 init_autofs_dev_ioctl(¶m
);
414 param
.ioctlfd
= ioctl_fd
;
417 param
.fail
.token
= token
;
418 param
.fail
.status
= status
;
420 param
.ready
.token
= token
;
422 if (ioctl(dev_autofs_fd
, status
? AUTOFS_DEV_IOCTL_FAIL
: AUTOFS_DEV_IOCTL_READY
, ¶m
) < 0)
428 int automount_send_ready(Automount
*a
, int status
) {
435 if (set_isempty(a
->tokens
))
438 if ((ioctl_fd
= open_ioctl_fd(a
->meta
.manager
->dev_autofs_fd
, a
->where
, a
->dev_id
)) < 0) {
444 log_debug("Sending failure: %s", strerror(-status
));
446 log_debug("Sending success.");
450 /* Autofs thankfully does not hand out 0 as a token */
451 while ((token
= PTR_TO_UINT(set_steal_first(a
->tokens
)))) {
454 /* Autofs fun fact II:
456 * if you pass a positive status code here, the kernel will
459 if ((k
= autofs_send_ready(a
->meta
.manager
->dev_autofs_fd
,
468 close_nointr_nofail(ioctl_fd
);
473 static void automount_enter_waiting(Automount
*a
) {
474 int p
[2] = { -1, -1 };
475 char name
[32], options
[128];
476 bool mounted
= false;
477 int r
, ioctl_fd
= -1, dev_autofs_fd
;
481 assert(a
->pipe_fd
< 0);
485 set_clear(a
->tokens
);
487 if ((dev_autofs_fd
= open_dev_autofs(a
->meta
.manager
)) < 0) {
492 /* We knowingly ignore the results of this call */
493 mkdir_p(a
->where
, 0555);
495 if (pipe2(p
, O_NONBLOCK
|O_CLOEXEC
) < 0) {
500 snprintf(options
, sizeof(options
), "fd=%i,pgrp=%u,minproto=5,maxproto=5,direct", p
[1], (unsigned) getpgrp());
501 char_array_0(options
);
503 snprintf(name
, sizeof(name
), "systemd-%u", (unsigned) getpid());
506 if (mount(name
, a
->where
, "autofs", 0, options
) < 0) {
513 close_nointr_nofail(p
[1]);
516 if (stat(a
->where
, &st
) < 0) {
521 if ((ioctl_fd
= open_ioctl_fd(dev_autofs_fd
, a
->where
, st
.st_dev
)) < 0) {
526 if ((r
= autofs_protocol(dev_autofs_fd
, ioctl_fd
)) < 0)
529 if ((r
= autofs_set_timeout(dev_autofs_fd
, ioctl_fd
, 300)) < 0)
534 * Unless we close the ioctl fd here, for some weird reason
535 * the direct mount will not receive events from the
538 close_nointr_nofail(ioctl_fd
);
541 if ((r
= unit_watch_fd(UNIT(a
), p
[0], EPOLLIN
, &a
->pipe_watch
)) < 0)
545 a
->dev_id
= st
.st_dev
;
547 automount_set_state(a
, AUTOMOUNT_WAITING
);
552 assert_se(close_pipe(p
) == 0);
555 close_nointr_nofail(ioctl_fd
);
558 repeat_unmout(a
->where
);
560 log_error("Failed to initialize automounter: %s", strerror(-r
));
561 automount_enter_dead(a
, false);
564 static void automount_enter_runnning(Automount
*a
) {
572 dbus_error_init(&error
);
574 /* We don't take mount requests anymore if we are supposed to
575 * shut down anyway */
576 if (unit_pending_inactive(UNIT(a
))) {
577 log_debug("Suppressing automount request on %s since unit stop is scheduled.", a
->meta
.id
);
578 automount_send_ready(a
, -EHOSTDOWN
);
582 mkdir_p(a
->where
, a
->directory_mode
);
584 /* Before we do anything, let's see if somebody is playing games with us? */
585 if (lstat(a
->where
, &st
) < 0) {
586 log_warning("%s failed to stat automount point: %m", a
->meta
.id
);
590 if (!S_ISDIR(st
.st_mode
) || st
.st_dev
!= a
->dev_id
)
591 log_info("%s's automount point already active?", a
->meta
.id
);
592 else if ((r
= manager_add_job(a
->meta
.manager
, JOB_START
, UNIT(a
->mount
), JOB_REPLACE
, true, &error
, NULL
)) < 0) {
593 log_warning("%s failed to queue mount startup job: %s", a
->meta
.id
, bus_error(&error
, r
));
597 automount_set_state(a
, AUTOMOUNT_RUNNING
);
601 automount_enter_dead(a
, false);
602 dbus_error_free(&error
);
605 static int automount_start(Unit
*u
) {
606 Automount
*a
= AUTOMOUNT(u
);
610 assert(a
->state
== AUTOMOUNT_DEAD
|| a
->state
== AUTOMOUNT_FAILED
);
612 if (path_is_mount_point(a
->where
)) {
613 log_error("Path %s is already a mount point, refusing start for %s", a
->where
, u
->meta
.id
);
617 if (a
->mount
->meta
.load_state
!= UNIT_LOADED
)
621 automount_enter_waiting(a
);
625 static int automount_stop(Unit
*u
) {
626 Automount
*a
= AUTOMOUNT(u
);
630 assert(a
->state
== AUTOMOUNT_WAITING
|| a
->state
== AUTOMOUNT_RUNNING
);
632 automount_enter_dead(a
, true);
636 static int automount_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
637 Automount
*a
= AUTOMOUNT(u
);
645 unit_serialize_item(u
, f
, "state", automount_state_to_string(a
->state
));
646 unit_serialize_item(u
, f
, "failure", yes_no(a
->failure
));
647 unit_serialize_item_format(u
, f
, "dev-id", "%u", (unsigned) a
->dev_id
);
649 SET_FOREACH(p
, a
->tokens
, i
)
650 unit_serialize_item_format(u
, f
, "token", "%u", PTR_TO_UINT(p
));
652 if (a
->pipe_fd
>= 0) {
655 if ((copy
= fdset_put_dup(fds
, a
->pipe_fd
)) < 0)
658 unit_serialize_item_format(u
, f
, "pipe-fd", "%i", copy
);
664 static int automount_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
665 Automount
*a
= AUTOMOUNT(u
);
671 if (streq(key
, "state")) {
672 AutomountState state
;
674 if ((state
= automount_state_from_string(value
)) < 0)
675 log_debug("Failed to parse state value %s", value
);
677 a
->deserialized_state
= state
;
678 } else if (streq(key
, "failure")) {
681 if ((b
= parse_boolean(value
)) < 0)
682 log_debug("Failed to parse failure value %s", value
);
684 a
->failure
= b
|| a
->failure
;
685 } else if (streq(key
, "dev-id")) {
688 if (safe_atou(value
, &d
) < 0)
689 log_debug("Failed to parse dev-id value %s", value
);
691 a
->dev_id
= (unsigned) d
;
692 } else if (streq(key
, "token")) {
695 if (safe_atou(value
, &token
) < 0)
696 log_debug("Failed to parse token value %s", value
);
699 if (!(a
->tokens
= set_new(trivial_hash_func
, trivial_compare_func
)))
702 if ((r
= set_put(a
->tokens
, UINT_TO_PTR(token
))) < 0)
705 } else if (streq(key
, "pipe-fd")) {
708 if (safe_atoi(value
, &fd
) < 0 || fd
< 0 || !fdset_contains(fds
, fd
))
709 log_debug("Failed to parse pipe-fd value %s", value
);
712 close_nointr_nofail(a
->pipe_fd
);
714 a
->pipe_fd
= fdset_remove(fds
, fd
);
717 log_debug("Unknown serialization key '%s'", key
);
722 static UnitActiveState
automount_active_state(Unit
*u
) {
725 return state_translation_table
[AUTOMOUNT(u
)->state
];
728 static const char *automount_sub_state_to_string(Unit
*u
) {
731 return automount_state_to_string(AUTOMOUNT(u
)->state
);
734 static bool automount_check_gc(Unit
*u
) {
735 Automount
*a
= AUTOMOUNT(u
);
742 return UNIT_VTABLE(UNIT(a
->mount
))->check_gc(UNIT(a
->mount
));
745 static void automount_fd_event(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
746 Automount
*a
= AUTOMOUNT(u
);
747 union autofs_v5_packet_union packet
;
752 assert(fd
== a
->pipe_fd
);
754 if (events
!= EPOLLIN
) {
755 log_error("Got invalid poll event on pipe.");
759 if ((l
= loop_read(a
->pipe_fd
, &packet
, sizeof(packet
), true)) != sizeof(packet
)) {
760 log_error("Invalid read from pipe: %s", l
< 0 ? strerror(-l
) : "short read");
764 switch (packet
.hdr
.type
) {
766 case autofs_ptype_missing_direct
:
768 if (packet
.v5_packet
.pid
> 0) {
771 get_process_name(packet
.v5_packet
.pid
, &p
);
772 log_debug("Got direct mount request for %s, triggered by %lu (%s)", packet
.v5_packet
.name
, (unsigned long) packet
.v5_packet
.pid
, strna(p
));
776 log_debug("Got direct mount request for %s", packet
.v5_packet
.name
);
779 if (!(a
->tokens
= set_new(trivial_hash_func
, trivial_compare_func
))) {
780 log_error("Failed to allocate token set.");
784 if ((r
= set_put(a
->tokens
, UINT_TO_PTR(packet
.v5_packet
.wait_queue_token
))) < 0) {
785 log_error("Failed to remember token: %s", strerror(-r
));
789 automount_enter_runnning(a
);
793 log_error("Received unknown automount request %i", packet
.hdr
.type
);
800 automount_enter_dead(a
, false);
803 static void automount_shutdown(Manager
*m
) {
806 if (m
->dev_autofs_fd
>= 0)
807 close_nointr_nofail(m
->dev_autofs_fd
);
810 static void automount_reset_failed(Unit
*u
) {
811 Automount
*a
= AUTOMOUNT(u
);
815 if (a
->state
== AUTOMOUNT_FAILED
)
816 automount_set_state(a
, AUTOMOUNT_DEAD
);
821 static const char* const automount_state_table
[_AUTOMOUNT_STATE_MAX
] = {
822 [AUTOMOUNT_DEAD
] = "dead",
823 [AUTOMOUNT_WAITING
] = "waiting",
824 [AUTOMOUNT_RUNNING
] = "running",
825 [AUTOMOUNT_FAILED
] = "failed"
828 DEFINE_STRING_TABLE_LOOKUP(automount_state
, AutomountState
);
830 const UnitVTable automount_vtable
= {
831 .suffix
= ".automount",
834 .no_instances
= true,
836 .init
= automount_init
,
837 .load
= automount_load
,
838 .done
= automount_done
,
840 .coldplug
= automount_coldplug
,
842 .dump
= automount_dump
,
844 .start
= automount_start
,
845 .stop
= automount_stop
,
847 .serialize
= automount_serialize
,
848 .deserialize_item
= automount_deserialize_item
,
850 .active_state
= automount_active_state
,
851 .sub_state_to_string
= automount_sub_state_to_string
,
853 .check_gc
= automount_check_gc
,
855 .fd_event
= automount_fd_event
,
857 .reset_failed
= automount_reset_failed
,
859 .bus_interface
= "org.freedesktop.systemd1.Automount",
860 .bus_message_handler
= bus_automount_message_handler
,
862 .shutdown
= automount_shutdown