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authorLennart Poettering <lennart@poettering.net>2016-10-25 00:04:55 +0200
committerLennart Poettering <lennart@poettering.net>2016-11-02 11:29:59 -0600
commit11222d0fe0b5abb0cef65359b979e0c7f50129f3 (patch)
tree5671d2d8781ba17625b410b2c1d7105ca09c398c /src
parentf5869324e303a136d7ca802769e8966e8eb26d56 (diff)
core: make the root mount perpetual too
Now that have a proper concept of "perpetual" units, let's make the root mount one too, since it also cannot go away.
Diffstat (limited to 'src')
-rw-r--r--src/basic/special.h3
-rw-r--r--src/core/mount.c81
2 files changed, 69 insertions, 15 deletions
diff --git a/src/basic/special.h b/src/basic/special.h
index 084d3dfa23..5276bcf598 100644
--- a/src/basic/special.h
+++ b/src/basic/special.h
@@ -117,3 +117,6 @@
/* The scope unit systemd itself lives in. */
#define SPECIAL_INIT_SCOPE "init.scope"
+
+/* The root directory. */
+#define SPECIAL_ROOT_MOUNT "-.mount"
diff --git a/src/core/mount.c b/src/core/mount.c
index da480001e1..03e5ea1376 100644
--- a/src/core/mount.c
+++ b/src/core/mount.c
@@ -159,17 +159,6 @@ static void mount_init(Unit *u) {
m->timeout_usec = u->manager->default_timeout_start_usec;
m->directory_mode = 0755;
- if (unit_has_name(u, "-.mount")) {
- /* Don't allow start/stop for root directory */
- u->refuse_manual_start = true;
- u->refuse_manual_stop = true;
- } else {
- /* The stdio/kmsg bridge socket is on /, in order to avoid a
- * dep loop, don't use kmsg logging for -.mount */
- m->exec_context.std_output = u->manager->default_std_output;
- m->exec_context.std_error = u->manager->default_std_error;
- }
-
/* We need to make sure that /usr/bin/mount is always called
* in the same process group as us, so that the autofs kernel
* side doesn't send us another mount request while we are
@@ -577,6 +566,25 @@ static int mount_add_extras(Mount *m) {
return 0;
}
+static int mount_load_root_mount(Unit *u) {
+ assert(u);
+
+ if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
+ return 0;
+
+ u->perpetual = true;
+ u->default_dependencies = false;
+
+ /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
+ MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
+ MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
+
+ if (!u->description)
+ u->description = strdup("Root Mount");
+
+ return 1;
+}
+
static int mount_load(Unit *u) {
Mount *m = MOUNT(u);
int r;
@@ -584,11 +592,14 @@ static int mount_load(Unit *u) {
assert(u);
assert(u->load_state == UNIT_STUB);
- if (m->from_proc_self_mountinfo)
+ r = mount_load_root_mount(u);
+ if (r < 0)
+ return r;
+
+ if (m->from_proc_self_mountinfo || u->perpetual)
r = unit_load_fragment_and_dropin_optional(u);
else
r = unit_load_fragment_and_dropin(u);
-
if (r < 0)
return r;
@@ -1592,11 +1603,51 @@ static int mount_get_timeout(Unit *u, usec_t *timeout) {
return 1;
}
+static void synthesize_root_mount(Manager *m) {
+ Unit *u;
+ int r;
+
+ assert(m);
+
+ /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
+ * unconditionally synthesize it here and mark it as perpetual. */
+
+ u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
+ if (!u) {
+ u = unit_new(m, sizeof(Mount));
+ if (!u) {
+ log_oom();
+ return;
+ }
+
+ r = unit_add_name(u, SPECIAL_ROOT_MOUNT);
+ if (r < 0) {
+ unit_free(u);
+ log_error_errno(r, "Failed to add the " SPECIAL_ROOT_MOUNT " name: %m");
+ return;
+ }
+ }
+
+ u->perpetual = true;
+ MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
+
+ unit_add_to_load_queue(u);
+ unit_add_to_dbus_queue(u);
+}
+
+static bool mount_is_mounted(Mount *m) {
+ assert(m);
+
+ return UNIT(m)->perpetual || m->is_mounted;
+}
+
static void mount_enumerate(Manager *m) {
int r;
assert(m);
+ synthesize_root_mount(m);
+
mnt_init_debug(0);
if (!m->mount_monitor) {
@@ -1703,7 +1754,7 @@ static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents,
LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
Mount *mount = MOUNT(u);
- if (!mount->is_mounted) {
+ if (!mount_is_mounted(mount)) {
/* A mount point is not around right now. It
* might be gone, or might never have
@@ -1764,7 +1815,7 @@ static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents,
}
}
- if (mount->is_mounted &&
+ if (mount_is_mounted(mount) &&
mount->from_proc_self_mountinfo &&
mount->parameters_proc_self_mountinfo.what) {