if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
goto fail;
- if (!(m->jobs_to_add = hashmap_new(trivial_hash_func, trivial_compare_func)))
- goto fail;
-
- if (!(m->jobs_to_remove = set_new(trivial_hash_func, trivial_compare_func)))
+ if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
goto fail;
return m;
void manager_free(Manager *m) {
Name *n;
+ Job *j;
assert(m);
while ((n = hashmap_first(m->names)))
name_free(n);
+ while ((j = hashmap_steal_first(m->transaction_jobs)))
+ job_free(j);
+
hashmap_free(m->names);
hashmap_free(m->jobs);
-
- /* FIXME: This is incomplete */
-
- hashmap_free(m->jobs_to_add);
- set_free(m->jobs_to_remove);
+ hashmap_free(m->transaction_jobs);
free(m);
}
Job *j;
assert(m);
- assert(m->n_dependency_depth == 0);
- while ((j = hashmap_steal_first(m->jobs_to_add)))
- job_free(j);
+ while ((j = hashmap_first(m->transaction_jobs)))
+ if (j->linked)
+ manager_transaction_delete_job(m, j);
+ else
+ job_free(j);
+
+ assert(hashmap_isempty(m->transaction_jobs));
+ assert(!m->transaction_anchor);
+}
+
+static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
+ JobDependency *l;
+
+ assert(m);
+
+ for (l = j ? j->subject_list : m->transaction_anchor; l; l = l->subject_next) {
+
+ /* This link does not matter */
+ if (!l->matters)
+ continue;
+
+ /* This name has already been marked */
+ if (l->object->generation == generation)
+ continue;
+
+ l->object->matters_to_anchor = true;
+ l->object->generation = generation;
+
+ transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
+ }
+}
+
+static bool types_match(JobType a, JobType b, JobType c, JobType d) {
+ return
+ (a == c && b == d) ||
+ (a == d && b == c);
+}
+
+static int types_merge(JobType *a, JobType b) {
+ if (*a == b)
+ return 0;
- set_clear(m->jobs_to_remove);
+ if (types_match(*a, b, JOB_START, JOB_VERIFY_STARTED))
+ *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_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_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))
+ *a = JOB_RELOAD;
+ else if (types_match(*a, b, JOB_VERIFY_STARTED, JOB_TRY_RESTART) ||
+ types_match(*a, b, JOB_RELOAD, JOB_TRY_RESTART))
+ *a = JOB_TRY_RESTART;
+
+ return -EEXIST;
}
-static int transaction_activate(Manager *m) {
+static void manager_merge_and_delete_prospective_job(Manager *m, Job *j, Job *other, JobType t) {
+ JobDependency *l, *last;
+
+ assert(j);
+ assert(other);
+ assert(j->name == other->name);
+ assert(!j->linked);
+
+ j->type = t;
+ j->state = JOB_WAITING;
+
+ j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
+
+ /* Patch us in as new owner of the JobDependency objects */
+ last = NULL;
+ for (l = other->subject_list; l; l = l->subject_next) {
+ assert(l->subject == other);
+ l->subject = j;
+ last = l;
+ }
+
+ /* Merge both lists */
+ if (last) {
+ last->subject_next = j->subject_list;
+ if (j->subject_list)
+ j->subject_list->subject_prev = last;
+ j->subject_list = other->subject_list;
+ }
+
+ /* Patch us in as new owner of the JobDependency objects */
+ last = NULL;
+ for (l = other->object_list; l; l = l->object_next) {
+ assert(l->object == other);
+ l->object = j;
+ last = l;
+ }
+
+ /* Merge both lists */
+ if (last) {
+ last->object_next = j->object_list;
+ if (j->object_list)
+ j->object_list->object_prev = last;
+ j->object_list = other->object_list;
+ }
+
+
+ /* Kill the other job */
+ other->subject_list = NULL;
+ other->object_list = NULL;
+ manager_transaction_delete_job(m, other);
+}
+
+static int transaction_merge_jobs(Manager *m) {
Job *j;
+ void *state;
+ int r;
+
+ assert(m);
+
+ HASHMAP_FOREACH(j, m->transaction_jobs, state) {
+ JobType t = j->type;
+ Job *k;
+
+ for (k = j->transaction_next; k; k = k->transaction_next)
+ if ((r = types_merge(&t, k->type)) < 0)
+ return r;
+
+ while ((k = j->transaction_next)) {
+ if (j->linked) {
+ manager_merge_and_delete_prospective_job(m, k, j, t);
+ j = k;
+ } else
+ manager_merge_and_delete_prospective_job(m, j, k, t);
+ }
+
+ assert(!j->transaction_next);
+ assert(!j->transaction_prev);
+ }
+
+ return r;
+}
+
+static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) {
+ void *state;
+ Name *n;
int r;
+
+ assert(m);
+ assert(j);
+
+ /* Did we find a loop? */
+ if (j->marker && j->generation == generation) {
+ Job *k;
+
+ /* So, we already have been here. We have a
+ * loop. Let's try to break it. We go backwards in our
+ * path and try to find a suitable job to remove. */
+
+ for (k = from; k; k = (k->generation == generation ? k->marker : NULL)) {
+ if (!k->matters_to_anchor) {
+ manager_transaction_delete_job(m, k);
+ return -EAGAIN;
+ }
+
+ /* Check if this in fact was the beginning of
+ * the loop */
+ if (k == j)
+ break;
+ }
+
+ return -ELOOP;
+ }
+
+ j->marker = from;
+ j->generation = generation;
+
+ /* We assume that the the dependencies are both-ways, and
+ * hence can ignore NAME_AFTER */
+
+ SET_FOREACH(n, j->name->meta.dependencies[NAME_BEFORE], state) {
+ Job *o;
+
+ if (!(o = hashmap_get(m->transaction_jobs, n)))
+ if (!(o = n->meta.job))
+ continue;
+
+ if ((r = transaction_verify_order_one(m, o, j, generation)) < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int transaction_verify_order(Manager *m, unsigned *generation) {
+ bool again;
+ assert(m);
+ assert(generation);
+
+ do {
+ Job *j;
+ int r;
+ void *state;
+
+ again = false;
+
+ HASHMAP_FOREACH(j, m->transaction_jobs, state) {
+
+ /* Assume merged */
+ assert(!j->transaction_next);
+ assert(!j->transaction_prev);
+
+ if ((r = transaction_verify_order_one(m, j, NULL, (*generation)++)) < 0) {
+
+ /* There was a loop, but it was fixed,
+ * we need to restart our algorithm */
+ if (r == -EAGAIN) {
+ again = true;
+ break;
+ }
+
+ return r;
+ }
+ }
+ } while (again);
+
+ return 0;
+}
+
+static void transaction_collect_garbage(Manager *m) {
+ bool again;
+
+ assert(m);
+
+ do {
+ void *state;
+ Job *j;
+
+ again = false;
+
+ HASHMAP_FOREACH(j, m->transaction_jobs, state) {
+ if (j->object_list)
+ continue;
+
+ manager_transaction_delete_job(m, j);
+ again = true;
+ break;
+ }
+
+ } while (again);
+}
+
+static int transaction_is_destructive(Manager *m, JobMode mode) {
void *state;
+ Job *j;
assert(m);
- assert(m->n_dependency_depth == 0);
- /* This applies the changes recorded in jobs_to_add and
- * jobs_to_remove to the actual list of jobs */
+ /* Checks whether applying this transaction means that
+ * existing jobs would be replaced */
- HASHMAP_FOREACH(j, m->jobs_to_add, state) {
- assert(!j->linked);
+ HASHMAP_FOREACH(j, m->transaction_jobs, state)
+ if (j->name->meta.job && j->name->meta.job != j)
+ return -EEXIST;
- if ((r = hashmap_put(j->manager->jobs, UINT32_TO_PTR(j->id), j)) < 0)
+ return 0;
+}
+
+static int transaction_apply(Manager *m, JobMode mode) {
+ void *state;
+ Job *j;
+ int r;
+
+ HASHMAP_FOREACH(j, m->transaction_jobs, state) {
+ if (j->linked)
+ continue;
+
+ if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
goto rollback;
}
- /* all entries are now registered, now make sure the names
- * know about that. */
+ while ((j = hashmap_steal_first(m->transaction_jobs))) {
+ if (j->linked)
+ continue;
+
+ if (j->name->meta.job)
+ job_free(j->name->meta.job);
- while ((j = hashmap_steal_first(m->jobs_to_add))) {
j->name->meta.job = j;
j->linked = true;
- }
- while ((j = set_steal_first(m->jobs_to_remove)))
- job_free(j);
+ /* We're fully installed. Now let's free data we don't
+ * need anymore. */
+
+ assert(!j->transaction_next);
+ assert(!j->transaction_prev);
+
+ while (j->subject_list)
+ job_dependency_free(j->subject_list);
+ while (j->object_list)
+ job_dependency_free(j->object_list);
+ }
return 0;
rollback:
- HASHMAP_FOREACH(j, m->jobs_to_add, state)
- hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id));
+ HASHMAP_FOREACH(j, m->transaction_jobs, state) {
+ if (j->linked)
+ continue;
+
+ hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
+ }
+
+ return r;
+}
+
+
+static int transaction_activate(Manager *m, JobMode mode) {
+ int r;
+ unsigned generation = 1;
+
+ assert(m);
+
+ /* This applies the changes recorded in transaction_jobs to
+ * the actual list of jobs, if possible. */
+
+ /* First step: figure out which jobs matter */
+ transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
+
+ /* Second step: let's merge entries we can merge */
+ if ((r = transaction_merge_jobs(m)) < 0)
+ goto rollback;
+
+ /* Third step: verify order makes sense */
+ if ((r = transaction_verify_order(m, &generation)) < 0)
+ goto rollback;
+
+ /* Third step: do garbage colletion */
+ transaction_collect_garbage(m);
+
+ /* Fourth step: check whether we can actually apply this */
+ if (mode == JOB_FAIL)
+ if ((r = transaction_is_destructive(m, mode)) < 0)
+ goto rollback;
+
+ /* Fifth step: apply changes */
+ if ((r = transaction_apply(m, mode)) < 0)
+ goto rollback;
+
+ assert(hashmap_isempty(m->transaction_jobs));
+ assert(!m->transaction_anchor);
+
+ return 0;
+rollback:
transaction_abort(m);
return r;
}
-int manager_add_job(Manager *m, JobType type, Name *name, JobMode mode, Job **_ret) {
- Job *ret, *other;
- void *state;
- Name *dep;
+static Job* transaction_add_job(Manager *m, JobType type, Name *name, bool *is_new) {
+ Job *j, *f;
int r;
assert(m);
- assert(type < _JOB_TYPE_MAX);
assert(name);
- assert(mode < _JOB_MODE_MAX);
- /* Check for conflicts, first against the jobs we shall
- * create */
- if ((other = hashmap_get(m->jobs_to_add, name))) {
+ /* Looks for an axisting prospective job and returns that. If
+ * it doesn't exist it is created and added to the prospective
+ * jobs list. */
- if (other->type != type)
- return -EEXIST;
+ f = hashmap_get(m->transaction_jobs, name);
- } else if (name->meta.job) {
+ for (j = f; j; j = j->transaction_next) {
+ assert(j->name == name);
- if (name->meta.job->type != type) {
+ if (j->type == type) {
+ if (is_new)
+ *is_new = false;
+ return j;
+ }
+ }
- if (mode == JOB_FAIL)
- return -EEXIST;
+ if (name->meta.job && name->meta.job->type == type)
+ j = name->meta.job;
+ else if (!(j = job_new(m, type, name)))
+ return NULL;
- if ((r = set_put(m->jobs_to_remove, name->meta.job)) < 0)
- return r;
- }
+ if ((r = hashmap_replace(m->transaction_jobs, name, j)) < 0) {
+ job_free(j);
+ return NULL;
}
- if (!(ret = job_new(m, type, name)))
- return -ENOMEM;
+ j->transaction_next = f;
- m->n_dependency_depth ++;
+ if (f)
+ f->transaction_prev = j;
- if ((r = hashmap_put(m->jobs_to_add, name, ret)) < 0)
- goto fail;
+ j->generation = 0;
+ j->marker = NULL;
+ j->matters_to_anchor = false;
- if (type == JOB_START || type == JOB_VERIFY_STARTED || type == JOB_RESTART_FINISH) {
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUIRES], state)
- if ((r = manager_add_job(m, type, dep, mode, NULL)) < 0)
- goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_SOFT_REQUIRES], state)
- if ((r = manager_add_job(m, type, dep, JOB_FAIL, NULL)) < 0)
- goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_WANTS], state)
- if ((r = manager_add_job(m, type, dep, JOB_FAIL, NULL)) < 0)
- goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUISITE], state)
- if ((r = manager_add_job(m, JOB_VERIFY_STARTED, dep, mode, NULL)) < 0)
- goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_SOFT_REQUISITE], state)
- if ((r = manager_add_job(m, JOB_VERIFY_STARTED, dep, JOB_FAIL, NULL)) < 0)
- goto fail;
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_CONFLICTS], state)
- if ((r = manager_add_job(m, type, dep, mode, NULL)) < 0)
- goto fail;
-
- } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
-
- SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUIRED_BY], state)
- if ((r = manager_add_job(m, type, dep, mode, NULL)) < 0)
- goto fail;
- }
+ if (is_new)
+ *is_new = true;
- if (--m->n_dependency_depth <= 0)
- if ((r = transaction_activate(m)) < 0) {
- transaction_abort(m);
- return r;
- }
+ return j;
+}
+void manager_transaction_delete_job(Manager *m, Job *j) {
+ assert(m);
+ assert(j);
- if (_ret)
- *_ret = ret;
+ if (j->transaction_prev)
+ j->transaction_prev->transaction_next = j->transaction_next;
+ else if (j->transaction_next)
+ hashmap_replace(m->transaction_jobs, j->name, j->transaction_next);
+ else
+ hashmap_remove_value(m->transaction_jobs, j->name, j);
+
+ if (j->transaction_next)
+ j->transaction_next->transaction_prev = j->transaction_prev;
+
+ j->transaction_prev = j->transaction_next = NULL;
+
+ while (j->subject_list)
+ job_dependency_free(j->subject_list);
+ while (j->object_list)
+ job_dependency_free(j->object_list);
+}
+
+static int real_add_job(Manager *m, JobType type, Name *name, Job *by, bool matters, bool force, Job **_ret) {
+ Job *ret;
+ void *state;
+ Name *dep;
+ int r;
+ bool is_new;
+
+ assert(m);
+ assert(type < _JOB_TYPE_MAX);
+ assert(name);
+
+ /* First add the job. */
+ if (!(ret = transaction_add_job(m, type, name, &is_new)))
+ return -ENOMEM;
+
+ /* Then, add a link to the job. */
+ if (!job_dependency_new(by, ret, matters))
+ return -ENOMEM;
+
+ if (is_new) {
+ /* Finally, recursively add in all dependencies. */
+ if (type == JOB_START || type == JOB_RELOAD_OR_START) {
+ SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUIRES], state)
+ if ((r = real_add_job(m, JOB_START, dep, ret, true, force, NULL)) < 0)
+ goto fail;
+ SET_FOREACH(dep, ret->name->meta.dependencies[NAME_SOFT_REQUIRES], state)
+ if ((r = real_add_job(m, JOB_START, dep, ret, !force, force, NULL)) < 0)
+ goto fail;
+ SET_FOREACH(dep, ret->name->meta.dependencies[NAME_WANTS], state)
+ if ((r = real_add_job(m, JOB_START, dep, ret, false, force, NULL)) < 0)
+ goto fail;
+ SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUISITE], state)
+ if ((r = real_add_job(m, JOB_VERIFY_STARTED, dep, ret, true, force, NULL)) < 0)
+ goto fail;
+ SET_FOREACH(dep, ret->name->meta.dependencies[NAME_SOFT_REQUISITE], state)
+ if ((r = real_add_job(m, JOB_VERIFY_STARTED, dep, ret, !force, force, NULL)) < 0)
+ goto fail;
+ SET_FOREACH(dep, ret->name->meta.dependencies[NAME_CONFLICTS], state)
+ if ((r = real_add_job(m, JOB_STOP, dep, ret, true, force, NULL)) < 0)
+ goto fail;
+
+ } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
+
+ SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUIRED_BY], state)
+ if ((r = real_add_job(m, type, dep, ret, true, force, NULL)) < 0)
+ goto fail;
+ }
+
+ /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
+ }
return 0;
fail:
- job_free(ret);
+ return r;
+}
+
+int manager_add_job(Manager *m, JobType type, Name *name, JobMode mode, bool force, Job **_ret) {
+ int r;
+ Job *ret;
+
+ assert(m);
+ assert(type < _JOB_TYPE_MAX);
+ assert(name);
+ assert(mode < _JOB_MODE_MAX);
- if (--m->n_dependency_depth <= 0)
+ if ((r = real_add_job(m, type, name, NULL, true, force, &ret))) {
transaction_abort(m);
+ return r;
+ }
- return r;
-}
+ if ((r = transaction_activate(m, mode)) < 0)
+ return r;
+
+ if (_ret)
+ *_ret = ret;
+ return 0;
+}
Job *manager_get_job(Manager *m, uint32_t id) {
assert(m);
if ((r = name_load_dropin(name)) < 0)
return r;
- if ((r = name_link_names(name)) < 0)
+ if ((r = name_link_names(name, true)) < 0)
return r;
name->meta.state = NAME_LOADED;
~ianmdlvl / elogind.git / commitdiff