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-rw-r--r--job.c257
1 files changed, 227 insertions, 30 deletions
diff --git a/job.c b/job.c
index 4688164e5a..0ae1a765fb 100644
--- a/job.c
+++ b/job.c
@@ -30,14 +30,15 @@ void job_free(Job *j) {
assert(j);
/* Detach from next 'bigger' objects */
-
if (j->linked) {
if (j->name->meta.job == j)
j->name->meta.job = NULL;
hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id));
+ j->linked = false;
}
+ /* Detach from next 'smaller' objects */
manager_transaction_unlink_job(j->manager, j);
free(j);
@@ -132,15 +133,14 @@ const char* job_type_to_string(JobType t) {
static const char* const job_type_table[_JOB_TYPE_MAX] = {
[JOB_START] = "start",
+ [JOB_VERIFY_ACTIVE] = "verify-active",
[JOB_STOP] = "stop",
- [JOB_VERIFY_STARTED] = "verify-started",
[JOB_RELOAD] = "reload",
[JOB_RELOAD_OR_START] = "reload-or-start",
[JOB_RESTART] = "restart",
[JOB_TRY_RESTART] = "try-restart",
};
-
if (t < 0 || t >= _JOB_TYPE_MAX)
return "n/a";
@@ -151,8 +151,7 @@ void job_dump(Job *j, FILE*f, const char *prefix) {
static const char* const job_state_table[_JOB_STATE_MAX] = {
[JOB_WAITING] = "waiting",
- [JOB_RUNNING] = "running",
- [JOB_DONE] = "done"
+ [JOB_RUNNING] = "running"
};
assert(j);
@@ -161,10 +160,12 @@ void job_dump(Job *j, FILE*f, const char *prefix) {
fprintf(f,
"%sJob %u:\n"
"%s\tAction: %s → %s\n"
- "%s\tState: %s\n",
+ "%s\tState: %s\n"
+ "%s\tForced: %s\n",
prefix, j->id,
prefix, name_id(j->name), job_type_to_string(j->type),
- prefix, job_state_table[j->state]);
+ prefix, job_state_table[j->state],
+ prefix, yes_no(j->forced));
}
bool job_is_anchor(Job *j) {
@@ -198,24 +199,24 @@ int job_type_merge(JobType *a, JobType b) {
/* Also, if a merged with b cannot be merged with c, then
* either a or b cannot be merged with c either */
- if (types_match(*a, b, JOB_START, JOB_VERIFY_STARTED))
+ if (types_match(*a, b, JOB_START, JOB_VERIFY_ACTIVE))
*a = JOB_START;
else if (types_match(*a, b, JOB_START, JOB_RELOAD) ||
types_match(*a, b, JOB_START, JOB_RELOAD_OR_START) ||
- types_match(*a, b, JOB_VERIFY_STARTED, JOB_RELOAD_OR_START) ||
+ types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RELOAD_OR_START) ||
types_match(*a, b, JOB_RELOAD, JOB_RELOAD_OR_START))
*a = JOB_RELOAD_OR_START;
else if (types_match(*a, b, JOB_START, JOB_RESTART) ||
types_match(*a, b, JOB_START, JOB_TRY_RESTART) ||
- types_match(*a, b, JOB_VERIFY_STARTED, JOB_RESTART) ||
+ types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RESTART) ||
types_match(*a, b, JOB_RELOAD, JOB_RESTART) ||
types_match(*a, b, JOB_RELOAD_OR_START, JOB_RESTART) ||
types_match(*a, b, JOB_RELOAD_OR_START, JOB_TRY_RESTART) ||
types_match(*a, b, JOB_RESTART, JOB_TRY_RESTART))
*a = JOB_RESTART;
- else if (types_match(*a, b, JOB_VERIFY_STARTED, JOB_RELOAD))
+ else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RELOAD))
*a = JOB_RELOAD;
- else if (types_match(*a, b, JOB_VERIFY_STARTED, JOB_TRY_RESTART) ||
+ else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_TRY_RESTART) ||
types_match(*a, b, JOB_RELOAD, JOB_TRY_RESTART))
*a = JOB_TRY_RESTART;
else
@@ -224,40 +225,43 @@ int job_type_merge(JobType *a, JobType b) {
return 0;
}
-bool job_type_mergeable(JobType a, JobType b) {
+bool job_type_is_mergeable(JobType a, JobType b) {
return job_type_merge(&a, b) >= 0;
}
bool job_type_is_superset(JobType a, JobType b) {
- /* Checks whether operation a is a "superset" of b */
+ /* Checks whether operation a is a "superset" of b in its
+ * actions */
if (a == b)
return true;
switch (a) {
case JOB_START:
- return b == JOB_VERIFY_STARTED;
+ return b == JOB_VERIFY_ACTIVE;
case JOB_RELOAD:
- return b == JOB_VERIFY_STARTED;
+ return
+ b == JOB_VERIFY_ACTIVE;
case JOB_RELOAD_OR_START:
return
b == JOB_RELOAD ||
- b == JOB_START;
+ b == JOB_START ||
+ b == JOB_VERIFY_ACTIVE;
case JOB_RESTART:
return
b == JOB_START ||
- b == JOB_VERIFY_STARTED ||
+ b == JOB_VERIFY_ACTIVE ||
b == JOB_RELOAD ||
b == JOB_RELOAD_OR_START ||
b == JOB_TRY_RESTART;
case JOB_TRY_RESTART:
return
- b == JOB_VERIFY_STARTED ||
+ b == JOB_VERIFY_ACTIVE ||
b == JOB_RELOAD;
default:
return false;
@@ -269,30 +273,223 @@ bool job_type_is_conflicting(JobType a, JobType b) {
assert(a >= 0 && a < _JOB_TYPE_MAX);
assert(b >= 0 && b < _JOB_TYPE_MAX);
- return
- (a == JOB_STOP && b != JOB_STOP) ||
- (b == JOB_STOP && a != JOB_STOP);
+ return (a == JOB_STOP) != (b == JOB_STOP);
}
-bool job_type_applicable(JobType j, NameType n) {
+bool job_type_is_applicable(JobType j, NameType n) {
assert(j >= 0 && j < _JOB_TYPE_MAX);
assert(n >= 0 && n < _NAME_TYPE_MAX);
switch (j) {
+ case JOB_VERIFY_ACTIVE:
case JOB_START:
- case JOB_STOP:
- case JOB_VERIFY_STARTED:
return true;
- case JOB_RELOAD:
- case JOB_RELOAD_OR_START:
- return n == NAME_SERVICE || n == NAME_TIMER || n == NAME_MOUNT;
-
+ case JOB_STOP:
case JOB_RESTART:
case JOB_TRY_RESTART:
- return n == NAME_SERVICE || n == NAME_TIMER || n == NAME_SOCKET || NAME_MOUNT || NAME_SNAPSHOT;
+ return name_type_can_start(n);
+
+ case JOB_RELOAD:
+ return name_type_can_reload(n);
+
+ case JOB_RELOAD_OR_START:
+ return name_type_can_reload(n) && name_type_can_start(n);
default:
assert_not_reached("Invalid job type");
}
}
+
+bool job_is_runnable(Job *j) {
+ void *state;
+ Name *other;
+
+ assert(j);
+ assert(j->linked);
+
+ /* Checks whether there is any job running for the names this
+ * job needs to be running after (in the case of a 'positive'
+ * job type) or before (in the case of a 'negative' job type
+ * . */
+
+ if (j->type == JOB_START ||
+ j->type == JOB_VERIFY_ACTIVE ||
+ j->type == JOB_RELOAD ||
+ j->type == JOB_RELOAD_OR_START) {
+
+ /* Immediate result is that the job is or might be
+ * started. In this case lets wait for the
+ * dependencies, regardless whether they are
+ * starting or stopping something. */
+
+ SET_FOREACH(other, j->name->meta.dependencies[NAME_AFTER], state)
+ if (other->meta.job)
+ return false;
+ }
+
+ /* Also, if something else is being stopped and we should
+ * change state after it, then lets wait. */
+
+ SET_FOREACH(other, j->name->meta.dependencies[NAME_BEFORE], state)
+ if (other->meta.job &&
+ (other->meta.job->type == JOB_STOP ||
+ other->meta.job->type == JOB_RESTART ||
+ other->meta.job->type == JOB_TRY_RESTART))
+ return false;
+
+ /* This means that for a service a and a service b where b
+ * shall be started after a:
+ *
+ * start a + start b → 1st step start a, 2nd step start b
+ * start a + stop b → 1st step stop b, 2nd step start a
+ * stop a + start b → 1st step stop a, 2nd step start b
+ * stop a + stop b → 1st step stop b, 2nd step stop a
+ *
+ * This has the side effect that restarts are properly
+ * synchronized too. */
+
+ return true;
+}
+
+int job_run_and_invalidate(Job *j) {
+ int r;
+ assert(j);
+
+ if (!job_is_runnable(j))
+ return -EAGAIN;
+
+ if (j->state != JOB_WAITING)
+ return 0;
+
+ switch (j->type) {
+
+ case JOB_START:
+ r = name_start(j->name);
+ if (r == -EBADR)
+ r = 0;
+ break;
+
+ case JOB_VERIFY_ACTIVE: {
+ NameActiveState t = name_active_state(j->name);
+ if (NAME_IS_ACTIVE_OR_RELOADING(t))
+ r = -EALREADY;
+ else if (t == NAME_ACTIVATING)
+ r = -EAGAIN;
+ else
+ r = -ENOEXEC;
+ break;
+ }
+
+ case JOB_STOP:
+ r = name_stop(j->name);
+ break;
+
+ case JOB_RELOAD:
+ r = name_reload(j->name);
+ break;
+
+ case JOB_RELOAD_OR_START:
+ if (name_active_state(j->name) == NAME_ACTIVE)
+ r = name_reload(j->name);
+ else
+ r = name_start(j->name);
+ break;
+
+ case JOB_RESTART: {
+ NameActiveState t = name_active_state(j->name);
+ if (t == NAME_INACTIVE || t == NAME_ACTIVATING) {
+ j->type = JOB_START;
+ r = name_start(j->name);
+ } else
+ r = name_stop(j->name);
+ break;
+ }
+
+ case JOB_TRY_RESTART: {
+ NameActiveState t = name_active_state(j->name);
+ if (t == NAME_INACTIVE || t == NAME_DEACTIVATING)
+ r = -ENOEXEC;
+ else if (t == NAME_ACTIVATING) {
+ j->type = JOB_START;
+ r = name_start(j->name);
+ } else
+ r = name_stop(j->name);
+ break;
+ }
+
+ default:
+ ;
+ }
+
+ if (r >= 0)
+ j->state = JOB_RUNNING;
+ else if (r == -EALREADY)
+ r = job_finish_and_invalidate(j, true);
+ else if (r != -EAGAIN)
+ r = job_finish_and_invalidate(j, false);
+
+ return r;
+}
+
+int job_finish_and_invalidate(Job *j, bool success) {
+ Name *n;
+ void *state;
+ Name *other;
+ NameType t;
+
+ assert(j);
+
+ if (success && (j->type == JOB_RESTART || j->type == JOB_TRY_RESTART)) {
+ j->state = JOB_RUNNING;
+ j->type = JOB_START;
+ return job_run_and_invalidate(j);
+ }
+
+ n = j->name;
+ t = j->type;
+ job_free(j);
+
+ /* Fail depending jobs on failure */
+ if (!success) {
+
+ if (t == JOB_START ||
+ t == JOB_VERIFY_ACTIVE ||
+ t == JOB_RELOAD_OR_START) {
+
+ SET_FOREACH(other, n->meta.dependencies[NAME_REQUIRED_BY], state)
+ if (other->meta.job &&
+ (other->meta.type == JOB_START ||
+ other->meta.type == JOB_VERIFY_ACTIVE ||
+ other->meta.type == JOB_RELOAD_OR_START))
+ job_finish_and_invalidate(other->meta.job, false);
+
+ SET_FOREACH(other, n->meta.dependencies[NAME_SOFT_REQUIRED_BY], state)
+ if (other->meta.job &&
+ !other->meta.job->forced &&
+ (other->meta.type == JOB_START ||
+ other->meta.type == JOB_VERIFY_ACTIVE ||
+ other->meta.type == JOB_RELOAD_OR_START))
+ job_finish_and_invalidate(other->meta.job, false);
+
+ } else if (t == JOB_STOP) {
+
+ SET_FOREACH(other, n->meta.dependencies[NAME_CONFLICTS], state)
+ if (other->meta.job &&
+ (t == JOB_START ||
+ t == JOB_VERIFY_ACTIVE ||
+ t == JOB_RELOAD_OR_START))
+ job_finish_and_invalidate(other->meta.job, false);
+ }
+ }
+
+ /* Try to start the next jobs that can be started */
+ SET_FOREACH(other, n->meta.dependencies[NAME_AFTER], state)
+ if (other->meta.job)
+ job_run_and_invalidate(other->meta.job);
+ SET_FOREACH(other, n->meta.dependencies[NAME_BEFORE], state)
+ if (other->meta.job)
+ job_run_and_invalidate(other->meta.job);
+
+ return 0;
+}
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