From c38c0e05767c5fd526368b63cebcdd5617332940 Mon Sep 17 00:00:00 2001
From: Michael Olbrich <m.olbrich@pengutronix.de>
Date: Tue, 14 Apr 2015 22:01:48 +0200
Subject: [PATCH] automount: add expire support
(cherry picked from commit deb0a77cf0b409141c4b116ae30becb3d878e1ad)
Resolves: #1354410
---
man/systemd.automount.xml | 8 ++
man/systemd.mount.xml | 9 ++
src/core/automount.c | 224 ++++++++++++++++++++++++++++++++--
src/core/automount.h | 6 +-
src/core/dbus-automount.c | 1 +
src/core/load-fragment-gperf.gperf.m4 | 1 +
src/core/mount.c | 20 +--
src/fstab-generator/fstab-generator.c | 28 +++++
8 files changed, 269 insertions(+), 28 deletions(-)
diff --git a/man/systemd.automount.xml b/man/systemd.automount.xml
index b5b5885cd..9561590c5 100644
--- a/man/systemd.automount.xml
+++ b/man/systemd.automount.xml
@@ -135,6 +135,14 @@
creating these directories. Takes an access mode in octal
notation. Defaults to 0755.</para></listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>TimeoutIdleSec=</varname></term>
+ <listitem><para>Configures an idleness timeout. Once the mount has been
+ idle for the specified time, systemd will attempt to unmount. Takes a
+ unit-less value in seconds, or a time span value such as "5min 20s".
+ Pass 0 to disable the timeout logic. The timeout is disabled by
+ default.</para></listitem>
+ </varlistentry>
</variablelist>
</refsect1>
diff --git a/man/systemd.mount.xml b/man/systemd.mount.xml
index 8e652e133..04ed1e1cf 100644
--- a/man/systemd.mount.xml
+++ b/man/systemd.mount.xml
@@ -177,6 +177,15 @@
for details.</para></listitem>
</varlistentry>
+ <varlistentry>
+ <term><option>x-systemd.idle-timeout=</option></term>
+
+ <listitem><para>Configures the idleness timeout of the
+ automount unit. See <varname>TimeoutIdleSec=</varname> in
+ <citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details.</para></listitem>
+ </varlistentry>
+
<varlistentry>
<term><option>x-systemd.device-timeout=</option></term>
diff --git a/src/core/automount.c b/src/core/automount.c
index b391f6198..4e066613d 100644
--- a/src/core/automount.c
+++ b/src/core/automount.c
@@ -42,6 +42,7 @@
#include "dbus-automount.h"
#include "bus-util.h"
#include "bus-error.h"
+#include "async.h"
static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = {
[AUTOMOUNT_DEAD] = UNIT_INACTIVE,
@@ -50,6 +51,22 @@ static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = {
[AUTOMOUNT_FAILED] = UNIT_FAILED
};
+struct expire_data {
+ int dev_autofs_fd;
+ int ioctl_fd;
+};
+
+static inline void expire_data_free(struct expire_data *data) {
+ if (!data)
+ return;
+
+ safe_close(data->dev_autofs_fd);
+ safe_close(data->ioctl_fd);
+ free(data);
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(struct expire_data*, expire_data_free);
+
static int open_dev_autofs(Manager *m);
static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, void *userdata);
@@ -81,13 +98,16 @@ static void repeat_unmount(const char *path) {
}
}
+static int automount_send_ready(Automount *a, Set *tokens, int status);
+
static void unmount_autofs(Automount *a) {
assert(a);
if (a->pipe_fd < 0)
return;
- automount_send_ready(a, -EHOSTDOWN);
+ automount_send_ready(a, a->tokens, -EHOSTDOWN);
+ automount_send_ready(a, a->expire_tokens, -EHOSTDOWN);
a->pipe_event_source = sd_event_source_unref(a->pipe_event_source);
a->pipe_fd = safe_close(a->pipe_fd);
@@ -112,6 +132,10 @@ static void automount_done(Unit *u) {
set_free(a->tokens);
a->tokens = NULL;
+ set_free(a->expire_tokens);
+ a->expire_tokens = NULL;
+
+ a->expire_event_source = sd_event_source_unref(a->expire_event_source);
}
static int automount_add_mount_links(Automount *a) {
@@ -265,6 +289,7 @@ static int automount_coldplug(Unit *u, Hashmap *deferred_work) {
}
static void automount_dump(Unit *u, FILE *f, const char *prefix) {
+ char time_string[FORMAT_TIMESPAN_MAX];
Automount *a = AUTOMOUNT(u);
assert(a);
@@ -273,11 +298,13 @@ static void automount_dump(Unit *u, FILE *f, const char *prefix) {
"%sAutomount State: %s\n"
"%sResult: %s\n"
"%sWhere: %s\n"
- "%sDirectoryMode: %04o\n",
+ "%sDirectoryMode: %04o\n"
+ "%sTimeoutIdleUSec: %s\n",
prefix, automount_state_to_string(a->state),
prefix, automount_result_to_string(a->result),
prefix, a->where,
- prefix, a->directory_mode);
+ prefix, a->directory_mode,
+ prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, a->timeout_idle_usec, USEC_PER_SEC));
}
static void automount_enter_dead(Automount *a, AutomountResult f) {
@@ -367,7 +394,7 @@ static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) {
return 0;
}
-static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, time_t sec) {
+static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, usec_t usec) {
struct autofs_dev_ioctl param;
assert(dev_autofs_fd >= 0);
@@ -375,7 +402,9 @@ static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, time_t sec) {
init_autofs_dev_ioctl(¶m);
param.ioctlfd = ioctl_fd;
- param.timeout.timeout = sec;
+
+ /* Convert to seconds, rounding up. */
+ param.timeout.timeout = (usec + USEC_PER_SEC - 1) / USEC_PER_SEC;
if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, ¶m) < 0)
return -errno;
@@ -404,7 +433,7 @@ static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, in
return 0;
}
-int automount_send_ready(Automount *a, int status) {
+static int automount_send_ready(Automount *a, Set *tokens, int status) {
_cleanup_close_ int ioctl_fd = -1;
unsigned token;
int r;
@@ -412,7 +441,7 @@ int automount_send_ready(Automount *a, int status) {
assert(a);
assert(status <= 0);
- if (set_isempty(a->tokens))
+ if (set_isempty(tokens))
return 0;
ioctl_fd = open_ioctl_fd(UNIT(a)->manager->dev_autofs_fd, a->where, a->dev_id);
@@ -427,7 +456,7 @@ int automount_send_ready(Automount *a, int status) {
r = 0;
/* Autofs thankfully does not hand out 0 as a token */
- while ((token = PTR_TO_UINT(set_steal_first(a->tokens)))) {
+ while ((token = PTR_TO_UINT(set_steal_first(tokens)))) {
int k;
/* Autofs fun fact II:
@@ -446,6 +475,55 @@ int automount_send_ready(Automount *a, int status) {
return r;
}
+int automount_update_mount(Automount *a, MountState old_state, MountState state) {
+ _cleanup_close_ int ioctl_fd = -1;
+
+ assert(a);
+
+ switch (state) {
+ case MOUNT_MOUNTED:
+ case MOUNT_REMOUNTING:
+ automount_send_ready(a, a->tokens, 0);
+ break;
+ case MOUNT_DEAD:
+ case MOUNT_UNMOUNTING:
+ case MOUNT_MOUNTING_SIGTERM:
+ case MOUNT_MOUNTING_SIGKILL:
+ case MOUNT_REMOUNTING_SIGTERM:
+ case MOUNT_REMOUNTING_SIGKILL:
+ case MOUNT_UNMOUNTING_SIGTERM:
+ case MOUNT_UNMOUNTING_SIGKILL:
+ case MOUNT_FAILED:
+ if (old_state != state)
+ automount_send_ready(a, a->tokens, -ENODEV);
+ break;
+ default:
+ break;
+ }
+
+ switch (state) {
+ case MOUNT_DEAD:
+ automount_send_ready(a, a->expire_tokens, 0);
+ break;
+ case MOUNT_MOUNTING:
+ case MOUNT_MOUNTING_DONE:
+ case MOUNT_MOUNTING_SIGTERM:
+ case MOUNT_MOUNTING_SIGKILL:
+ case MOUNT_REMOUNTING_SIGTERM:
+ case MOUNT_REMOUNTING_SIGKILL:
+ case MOUNT_UNMOUNTING_SIGTERM:
+ case MOUNT_UNMOUNTING_SIGKILL:
+ case MOUNT_FAILED:
+ if (old_state != state)
+ automount_send_ready(a, a->expire_tokens, -ENODEV);
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
static void automount_enter_waiting(Automount *a) {
_cleanup_close_ int ioctl_fd = -1;
int p[2] = { -1, -1 };
@@ -505,7 +583,7 @@ static void automount_enter_waiting(Automount *a) {
if (r < 0)
goto fail;
- r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, 300);
+ r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, a->timeout_idle_usec);
if (r < 0)
goto fail;
@@ -537,6 +615,83 @@ fail:
automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES);
}
+static void *expire_thread(void *p) {
+ struct autofs_dev_ioctl param;
+ _cleanup_(expire_data_freep) struct expire_data *data = (struct expire_data*)p;
+ int r;
+
+ assert(data->dev_autofs_fd >= 0);
+ assert(data->ioctl_fd >= 0);
+
+ init_autofs_dev_ioctl(¶m);
+ param.ioctlfd = data->ioctl_fd;
+
+ do {
+ r = ioctl(data->dev_autofs_fd, AUTOFS_DEV_IOCTL_EXPIRE, ¶m);
+ } while (r >= 0);
+
+ if (errno != EAGAIN)
+ log_warning_errno(errno, "Failed to expire automount, ignoring: %m");
+
+ return NULL;
+}
+
+static int automount_start_expire(Automount *a);
+
+static int automount_dispatch_expire(sd_event_source *source, usec_t usec, void *userdata) {
+ Automount *a = AUTOMOUNT(userdata);
+ _cleanup_(expire_data_freep) struct expire_data *data = NULL;
+ int r;
+
+ assert(a);
+ assert(source == a->expire_event_source);
+
+ data = new0(struct expire_data, 1);
+ if (!data)
+ return log_oom();
+
+ data->ioctl_fd = -1;
+
+ data->dev_autofs_fd = fcntl(UNIT(a)->manager->dev_autofs_fd, F_DUPFD_CLOEXEC, 3);
+ if (data->dev_autofs_fd < 0)
+ return log_unit_error_errno(UNIT(a)->id, errno, "Failed to duplicate autofs fd: %m");
+
+ data->ioctl_fd = open_ioctl_fd(UNIT(a)->manager->dev_autofs_fd, a->where, a->dev_id);
+ if (data->ioctl_fd < 0)
+ return log_unit_error_errno(UNIT(a)->id, data->ioctl_fd, "Couldn't open autofs ioctl fd: %m");
+
+ r = asynchronous_job(expire_thread, data);
+ if (r < 0)
+ return log_unit_error_errno(UNIT(a)->id, r, "Failed to start expire job: %m");
+
+ data = NULL;
+
+ return automount_start_expire(a);
+}
+
+static int automount_start_expire(Automount *a) {
+ int r;
+ usec_t timeout;
+
+ assert(a);
+
+ timeout = now(CLOCK_MONOTONIC) + MAX(a->timeout_idle_usec/10, USEC_PER_SEC);
+
+ if (a->expire_event_source) {
+ r = sd_event_source_set_time(a->expire_event_source, timeout);
+ if (r < 0)
+ return r;
+
+ return sd_event_source_set_enabled(a->expire_event_source, SD_EVENT_ONESHOT);
+ }
+
+ return sd_event_add_time(
+ UNIT(a)->manager->event,
+ &a->expire_event_source,
+ CLOCK_MONOTONIC, timeout, 0,
+ automount_dispatch_expire, a);
+}
+
static void automount_enter_runnning(Automount *a) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
struct stat st;
@@ -549,7 +704,8 @@ static void automount_enter_runnning(Automount *a) {
if (unit_stop_pending(UNIT(a))) {
log_unit_debug(UNIT(a)->id,
"Suppressing automount request on %s since unit stop is scheduled.", UNIT(a)->id);
- automount_send_ready(a, -EHOSTDOWN);
+ automount_send_ready(a, a->tokens, -EHOSTDOWN);
+ automount_send_ready(a, a->expire_tokens, -EHOSTDOWN);
return;
}
@@ -576,6 +732,10 @@ static void automount_enter_runnning(Automount *a) {
}
}
+ r = automount_start_expire(a);
+ if (r < 0)
+ log_unit_warning_errno(UNIT(a)->id, r, "Failed to start expiration timer, ignoring: %m");
+
automount_set_state(a, AUTOMOUNT_RUNNING);
return;
@@ -629,6 +789,8 @@ static int automount_serialize(Unit *u, FILE *f, FDSet *fds) {
SET_FOREACH(p, a->tokens, i)
unit_serialize_item_format(u, f, "token", "%u", PTR_TO_UINT(p));
+ SET_FOREACH(p, a->expire_tokens, i)
+ unit_serialize_item_format(u, f, "expire-token", "%u", PTR_TO_UINT(p));
if (a->pipe_fd >= 0) {
int copy;
@@ -688,6 +850,22 @@ static int automount_deserialize_item(Unit *u, const char *key, const char *valu
if (r < 0)
return r;
}
+ } else if (streq(key, "expire-token")) {
+ unsigned token;
+
+ if (safe_atou(value, &token) < 0)
+ log_unit_debug(u->id, "Failed to parse token value %s", value);
+ else {
+ r = set_ensure_allocated(&a->expire_tokens, NULL);
+ if (r < 0) {
+ log_oom();
+ return 0;
+ }
+
+ r = set_put(a->expire_tokens, UINT_TO_PTR(token));
+ if (r < 0)
+ log_unit_error_errno(u->id, r, "Failed to add expire token to set: %m");
+ }
} else if (streq(key, "pipe-fd")) {
int fd;
@@ -725,6 +903,7 @@ static bool automount_check_gc(Unit *u) {
}
static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, void *userdata) {
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
union autofs_v5_packet_union packet;
Automount *a = AUTOMOUNT(userdata);
ssize_t l;
@@ -777,6 +956,31 @@ static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, vo
automount_enter_runnning(a);
break;
+ case autofs_ptype_expire_direct:
+ log_unit_debug(UNIT(a)->id, "Got direct umount request on %s", a->where);
+
+ (void) sd_event_source_set_enabled(a->expire_event_source, SD_EVENT_OFF);
+
+ r = set_ensure_allocated(&a->expire_tokens, NULL);
+ if (r < 0) {
+ log_unit_error(UNIT(a)->id, "Failed to allocate token set.");
+ goto fail;
+ }
+
+ r = set_put(a->expire_tokens, UINT_TO_PTR(packet.v5_packet.wait_queue_token));
+ if (r < 0) {
+ log_unit_error_errno(UNIT(a)->id, r, "Failed to remember token: %m");
+ goto fail;
+ }
+ r = manager_add_job(UNIT(a)->manager, JOB_STOP, UNIT_TRIGGER(UNIT(a)), JOB_REPLACE, true, &error, NULL);
+ if (r < 0) {
+ log_unit_warning(UNIT(a)->id,
+ "%s failed to queue umount startup job: %s",
+ UNIT(a)->id, bus_error_message(&error, r));
+ goto fail;
+ }
+ break;
+
default:
log_unit_error(UNIT(a)->id, "Received unknown automount request %i", packet.hdr.type);
break;
diff --git a/src/core/automount.h b/src/core/automount.h
index 60f552238..2a50fef68 100644
--- a/src/core/automount.h
+++ b/src/core/automount.h
@@ -47,6 +47,7 @@ struct Automount {
AutomountState state, deserialized_state;
char *where;
+ usec_t timeout_idle_usec;
int pipe_fd;
sd_event_source *pipe_event_source;
@@ -54,13 +55,16 @@ struct Automount {
dev_t dev_id;
Set *tokens;
+ Set *expire_tokens;
+
+ sd_event_source *expire_event_source;
AutomountResult result;
};
extern const UnitVTable automount_vtable;
-int automount_send_ready(Automount *a, int status);
+int automount_update_mount(Automount *a, MountState old_state, MountState state);
const char* automount_state_to_string(AutomountState i) _const_;
AutomountState automount_state_from_string(const char *s) _pure_;
diff --git a/src/core/dbus-automount.c b/src/core/dbus-automount.c
index b2a510ad0..c62ad8242 100644
--- a/src/core/dbus-automount.c
+++ b/src/core/dbus-automount.c
@@ -32,5 +32,6 @@ const sd_bus_vtable bus_automount_vtable[] = {
SD_BUS_PROPERTY("Where", "s", NULL, offsetof(Automount, where), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("DirectoryMode", "u", bus_property_get_mode, offsetof(Automount, directory_mode), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Automount, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
+ SD_BUS_PROPERTY("TimeoutIdleUSec", "t", bus_property_get_usec, offsetof(Automount, timeout_idle_usec), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_VTABLE_END
};
diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
index f3a6e13d9..c866a9cd0 100644
--- a/src/core/load-fragment-gperf.gperf.m4
+++ b/src/core/load-fragment-gperf.gperf.m4
@@ -318,6 +318,7 @@ KILL_CONTEXT_CONFIG_ITEMS(Mount)m4_dnl
m4_dnl
Automount.Where, config_parse_path, 0, offsetof(Automount, where)
Automount.DirectoryMode, config_parse_mode, 0, offsetof(Automount, directory_mode)
+Automount.TimeoutIdleSec, config_parse_sec, 0, offsetof(Automount, timeout_idle_usec)
m4_dnl
Swap.What, config_parse_path, 0, offsetof(Swap, parameters_fragment.what)
Swap.Priority, config_parse_int, 0, offsetof(Swap, parameters_fragment.priority)
diff --git a/src/core/mount.c b/src/core/mount.c
index 3fbdb7daf..7ca7f5a25 100644
--- a/src/core/mount.c
+++ b/src/core/mount.c
@@ -552,7 +552,7 @@ static int mount_load(Unit *u) {
return mount_verify(m);
}
-static int mount_notify_automount(Mount *m, int status) {
+static int mount_notify_automount(Mount *m, MountState old_state, MountState state) {
Unit *p;
int r;
Iterator i;
@@ -561,7 +561,7 @@ static int mount_notify_automount(Mount *m, int status) {
SET_FOREACH(p, UNIT(m)->dependencies[UNIT_TRIGGERED_BY], i)
if (p->type == UNIT_AUTOMOUNT) {
- r = automount_send_ready(AUTOMOUNT(p), status);
+ r = automount_update_mount(AUTOMOUNT(p), old_state, state);
if (r < 0)
return r;
}
@@ -592,21 +592,7 @@ static void mount_set_state(Mount *m, MountState state) {
m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
}
- if (state == MOUNT_MOUNTED ||
- state == MOUNT_REMOUNTING)
- mount_notify_automount(m, 0);
- else if (state == MOUNT_DEAD ||
- state == MOUNT_UNMOUNTING ||
- state == MOUNT_MOUNTING_SIGTERM ||
- state == MOUNT_MOUNTING_SIGKILL ||
- state == MOUNT_REMOUNTING_SIGTERM ||
- state == MOUNT_REMOUNTING_SIGKILL ||
- state == MOUNT_UNMOUNTING_SIGTERM ||
- state == MOUNT_UNMOUNTING_SIGKILL ||
- state == MOUNT_FAILED) {
- if (state != old_state)
- mount_notify_automount(m, -ENODEV);
- }
+ mount_notify_automount(m, old_state, state);
if (state != old_state)
log_unit_debug(UNIT(m)->id,
diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
index 029eb1638..a943393b0 100644
--- a/src/fstab-generator/fstab-generator.c
+++ b/src/fstab-generator/fstab-generator.c
@@ -213,6 +213,30 @@ static int write_requires_mounts_for(FILE *f, const char *opts) {
return 0;
}
+
+static int write_idle_timeout(FILE *f, const char *where, const char *opts, char **filtered) {
+ _cleanup_free_ char *timeout = NULL;
+ char timespan[FORMAT_TIMESPAN_MAX];
+ usec_t u;
+ int r;
+
+ r = fstab_filter_options(opts, "x-systemd.idle-timeout\0", NULL, &timeout, filtered);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to parse options: %m");
+ if (r == 0)
+ return 0;
+
+ r = parse_sec(timeout, &u);
+ if (r < 0) {
+ log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
+ return 0;
+ }
+
+ fprintf(f, "TimeoutIdleSec=%s\n", format_timespan(timespan, sizeof(timespan), u, 0));
+
+ return 0;
+}
+
static int add_mount(
const char *what,
const char *where,
@@ -374,6 +398,10 @@ static int add_mount(
"Where=%s\n",
where);
+ r = write_idle_timeout(f, where, opts, &filtered);
+ if (r < 0)
+ return r;
+
fflush(f);
if (ferror(f))
return log_error_errno(errno, "Failed to write unit file %s: %m", automount_unit);