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/>.
26 #include <sys/epoll.h>
32 #include "load-fragment.h"
33 #include "load-dropin.h"
34 #include "unit-name.h"
35 #include "dbus-swap.h"
38 static const UnitActiveState state_translation_table
[_SWAP_STATE_MAX
] = {
39 [SWAP_DEAD
] = UNIT_INACTIVE
,
40 [SWAP_ACTIVE
] = UNIT_ACTIVE
,
41 [SWAP_MAINTENANCE
] = UNIT_MAINTENANCE
44 static void swap_init(Unit
*u
) {
48 assert(s
->meta
.load_state
== UNIT_STUB
);
50 s
->parameters_etc_fstab
.priority
= s
->parameters_proc_swaps
.priority
= s
->parameters_fragment
.priority
= -1;
53 static void swap_done(Unit
*u
) {
59 free(s
->parameters_etc_fstab
.what
);
60 free(s
->parameters_proc_swaps
.what
);
61 free(s
->parameters_fragment
.what
);
64 int swap_add_one_mount_link(Swap
*s
, Mount
*m
) {
70 if (s
->meta
.load_state
!= UNIT_LOADED
||
71 m
->meta
.load_state
!= UNIT_LOADED
)
74 if (is_device_path(s
->what
))
77 if (!path_startswith(s
->what
, m
->where
))
80 if ((r
= unit_add_two_dependencies(UNIT(s
), UNIT_AFTER
, UNIT_REQUIRES
, UNIT(m
), true)) < 0)
86 static int swap_add_mount_links(Swap
*s
) {
92 LIST_FOREACH(units_per_type
, other
, s
->meta
.manager
->units_per_type
[UNIT_MOUNT
])
93 if ((r
= swap_add_one_mount_link(s
, (Mount
*) other
)) < 0)
99 static int swap_add_target_links(Swap
*s
) {
106 if (s
->from_fragment
)
107 p
= &s
->parameters_fragment
;
108 else if (s
->from_etc_fstab
)
109 p
= &s
->parameters_etc_fstab
;
113 if ((r
= manager_load_unit(s
->meta
.manager
, SPECIAL_SWAP_TARGET
, NULL
, NULL
, &tu
)) < 0)
116 if (!p
->noauto
&& p
->handle
&& s
->meta
.manager
->running_as
== MANAGER_SYSTEM
)
117 if ((r
= unit_add_dependency(tu
, UNIT_WANTS
, UNIT(s
), true)) < 0)
120 return unit_add_dependency(UNIT(s
), UNIT_BEFORE
, tu
, true);
123 static int swap_add_default_dependencies(Swap
*s
) {
128 if (s
->meta
.manager
->running_as
== MANAGER_SYSTEM
) {
130 if ((r
= unit_add_dependency_by_name(UNIT(s
), UNIT_AFTER
, SPECIAL_SYSINIT_TARGET
, NULL
, true)) < 0)
133 /* Note that by default we don't disable swap devices
134 * on shutdown. i.e. there is no umount.target
141 static int swap_verify(Swap
*s
) {
145 if (s
->meta
.load_state
!= UNIT_LOADED
)
148 if (!(e
= unit_name_from_path(s
->what
, ".swap")))
151 b
= unit_has_name(UNIT(s
), e
);
155 log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", s
->meta
.id
);
162 static int swap_load(Unit
*u
) {
167 assert(u
->meta
.load_state
== UNIT_STUB
);
169 /* Load a .swap file */
170 if ((r
= unit_load_fragment_and_dropin_optional(u
)) < 0)
173 if (u
->meta
.load_state
== UNIT_LOADED
) {
175 if (s
->meta
.fragment_path
)
176 s
->from_fragment
= true;
179 if (s
->parameters_fragment
.what
)
180 s
->what
= strdup(s
->parameters_fragment
.what
);
181 else if (s
->parameters_etc_fstab
.what
)
182 s
->what
= strdup(s
->parameters_etc_fstab
.what
);
183 else if (s
->parameters_proc_swaps
.what
)
184 s
->what
= strdup(s
->parameters_proc_swaps
.what
);
186 s
->what
= unit_name_to_path(u
->meta
.id
);
192 path_kill_slashes(s
->what
);
194 if (!s
->meta
.description
)
195 if ((r
= unit_set_description(u
, s
->what
)) < 0)
198 if ((r
= unit_add_node_link(u
, s
->what
, u
->meta
.manager
->running_as
== MANAGER_SYSTEM
)) < 0)
201 if ((r
= swap_add_mount_links(s
)) < 0)
204 if ((r
= swap_add_target_links(s
)) < 0)
207 if (s
->meta
.default_dependencies
)
208 if ((r
= swap_add_default_dependencies(s
)) < 0)
212 return swap_verify(s
);
215 static int swap_find(Manager
*m
, const char *what
, Unit
**_u
) {
223 /* /proc/swaps and /etc/fstab might refer to this device by
224 * different names (e.g. one by uuid, the other by the kernel
225 * name), we hence need to look for all aliases we are aware
226 * of for this device */
228 if (!(e
= unit_name_from_path(what
, ".device")))
231 u
= manager_get_unit(m
, e
);
238 SET_FOREACH(d
, u
->meta
.names
, i
) {
241 if (!(e
= unit_name_change_suffix(d
, ".swap")))
244 k
= manager_get_unit(m
, e
);
264 bool from_proc_swaps
) {
266 char *e
= NULL
, *w
= NULL
;
274 if (!(e
= unit_name_from_path(what
, ".swap")))
277 if (!(u
= manager_get_unit(m
, e
)))
278 if ((r
= swap_find(m
, what
, &u
)) < 0)
284 if (!(u
= unit_new(m
))) {
291 if ((r
= unit_add_name(u
, e
)) < 0)
294 if (!(w
= strdup(what
))) {
299 if (from_proc_swaps
) {
300 p
= &SWAP(u
)->parameters_proc_swaps
;
301 SWAP(u
)->from_proc_swaps
= true;
303 p
= &SWAP(u
)->parameters_etc_fstab
;
304 SWAP(u
)->from_etc_fstab
= true;
310 p
->priority
= priority
;
315 unit_add_to_load_queue(u
);
317 unit_add_to_dbus_queue(u
);
333 static void swap_set_state(Swap
*s
, SwapState state
) {
337 old_state
= s
->state
;
340 if (state
!= old_state
)
341 log_debug("%s changed %s -> %s",
343 swap_state_to_string(old_state
),
344 swap_state_to_string(state
));
346 unit_notify(UNIT(s
), state_translation_table
[old_state
], state_translation_table
[state
]);
349 static int swap_coldplug(Unit
*u
) {
351 SwapState new_state
= SWAP_DEAD
;
354 assert(s
->state
== SWAP_DEAD
);
356 if (s
->deserialized_state
!= s
->state
)
357 new_state
= s
->deserialized_state
;
358 else if (s
->from_proc_swaps
)
359 new_state
= SWAP_ACTIVE
;
361 if (new_state
!= s
->state
)
362 swap_set_state(s
, new_state
);
367 static void swap_dump(Unit
*u
, FILE *f
, const char *prefix
) {
374 if (s
->from_proc_swaps
)
375 p
= &s
->parameters_proc_swaps
;
376 else if (s
->from_fragment
)
377 p
= &s
->parameters_fragment
;
379 p
= &s
->parameters_etc_fstab
;
387 "%sFrom /etc/fstab: %s\n"
388 "%sFrom /proc/swaps: %s\n"
389 "%sFrom fragment: %s\n",
390 prefix
, swap_state_to_string(s
->state
),
393 prefix
, yes_no(p
->noauto
),
394 prefix
, yes_no(p
->handle
),
395 prefix
, yes_no(s
->from_etc_fstab
),
396 prefix
, yes_no(s
->from_proc_swaps
),
397 prefix
, yes_no(s
->from_fragment
));
400 static void swap_enter_dead(Swap
*s
, bool success
) {
403 swap_set_state(s
, success
? SWAP_DEAD
: SWAP_MAINTENANCE
);
406 static int swap_start(Unit
*u
) {
412 assert(s
->state
== SWAP_DEAD
|| s
->state
== SWAP_MAINTENANCE
);
414 if (s
->from_fragment
)
415 priority
= s
->parameters_fragment
.priority
;
416 else if (s
->from_etc_fstab
)
417 priority
= s
->parameters_etc_fstab
.priority
;
419 r
= swapon(s
->what
, (priority
<< SWAP_FLAG_PRIO_SHIFT
) & SWAP_FLAG_PRIO_MASK
);
421 if (r
< 0 && errno
!= EBUSY
) {
423 swap_enter_dead(s
, false);
427 swap_set_state(s
, SWAP_ACTIVE
);
431 static int swap_stop(Unit
*u
) {
437 assert(s
->state
== SWAP_ACTIVE
);
439 r
= swapoff(s
->what
);
440 swap_enter_dead(s
, r
>= 0 || errno
== EINVAL
);
445 static int swap_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
452 unit_serialize_item(u
, f
, "state", swap_state_to_string(s
->state
));
457 static int swap_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
463 if (streq(key
, "state")) {
466 if ((state
= swap_state_from_string(value
)) < 0)
467 log_debug("Failed to parse state value %s", value
);
469 s
->deserialized_state
= state
;
471 log_debug("Unknown serialization key '%s'", key
);
476 static UnitActiveState
swap_active_state(Unit
*u
) {
479 return state_translation_table
[SWAP(u
)->state
];
482 static const char *swap_sub_state_to_string(Unit
*u
) {
485 return swap_state_to_string(SWAP(u
)->state
);
488 static bool swap_check_gc(Unit
*u
) {
493 return s
->from_etc_fstab
|| s
->from_proc_swaps
;
496 static int swap_load_proc_swaps(Manager
*m
) {
497 rewind(m
->proc_swaps
);
499 (void) fscanf(m
->proc_swaps
, "%*s %*s %*s %*s %*s\n");
502 char *dev
= NULL
, *d
;
505 if ((k
= fscanf(m
->proc_swaps
,
506 "%ms " /* device/file */
507 "%*s " /* type of swap */
508 "%*s " /* swap size */
510 "%i\n", /* priority */
511 &dev
, &prio
)) != 2) {
526 k
= swap_add_one(m
, d
, prio
, false, false, true);
536 static void swap_shutdown(Manager
*m
) {
540 fclose(m
->proc_swaps
);
541 m
->proc_swaps
= NULL
;
545 static int swap_enumerate(Manager
*m
) {
550 if (!(m
->proc_swaps
= fopen("/proc/swaps", "re")))
553 if ((r
= swap_load_proc_swaps(m
)) < 0)
559 static void swap_reset_maintenance(Unit
*u
) {
564 if (s
->state
== SWAP_MAINTENANCE
)
565 swap_set_state(s
, SWAP_DEAD
);
568 static const char* const swap_state_table
[_SWAP_STATE_MAX
] = {
569 [SWAP_DEAD
] = "dead",
570 [SWAP_ACTIVE
] = "active",
571 [SWAP_MAINTENANCE
] = "maintenance"
574 DEFINE_STRING_TABLE_LOOKUP(swap_state
, SwapState
);
576 const UnitVTable swap_vtable
= {
579 .no_instances
= true,
587 .coldplug
= swap_coldplug
,
594 .serialize
= swap_serialize
,
595 .deserialize_item
= swap_deserialize_item
,
597 .active_state
= swap_active_state
,
598 .sub_state_to_string
= swap_sub_state_to_string
,
600 .check_gc
= swap_check_gc
,
602 .bus_interface
= "org.freedesktop.systemd1.Swap",
603 .bus_message_handler
= bus_swap_message_handler
,
604 .bus_invalidating_properties
= bus_swap_invalidating_properties
,
606 .reset_maintenance
= swap_reset_maintenance
,
608 .enumerate
= swap_enumerate
,
609 .shutdown
= swap_shutdown