/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * graph.c - master restarter graph engine * * The graph engine keeps a dependency graph of all service instances on the * system, as recorded in the repository. It decides when services should * be brought up or down based on service states and dependencies and sends * commands to restarters to effect any changes. It also executes * administrator commands sent by svcadm via the repository. * * The graph is stored in uu_list_t *dgraph and its vertices are * graph_vertex_t's, each of which has a name and an integer id unique to * its name (see dict.c). A vertex's type attribute designates the type * of object it represents: GVT_INST for service instances, GVT_SVC for * service objects (since service instances may depend on another service, * rather than service instance), GVT_FILE for files (which services may * depend on), and GVT_GROUP for dependencies on multiple objects. GVT_GROUP * vertices are necessary because dependency lists may have particular * grouping types (require any, require all, optional, or exclude) and * event-propagation characteristics. * * The initial graph is built by libscf_populate_graph() invoking * dgraph_add_instance() for each instance in the repository. The function * adds a GVT_SVC vertex for the service if one does not already exist, adds * a GVT_INST vertex named by the FMRI of the instance, and sets up the edges. * The resulting web of vertices & edges associated with an instance's vertex * includes * * - an edge from the GVT_SVC vertex for the instance's service * * - an edge to the GVT_INST vertex of the instance's resarter, if its * restarter is not svc.startd * * - edges from other GVT_INST vertices if the instance is a restarter * * - for each dependency property group in the instance's "running" * snapshot, an edge to a GVT_GROUP vertex named by the FMRI of the * instance and the name of the property group * * - for each value of the "entities" property in each dependency property * group, an edge from the corresponding GVT_GROUP vertex to a * GVT_INST, GVT_SVC, or GVT_FILE vertex * * - edges from GVT_GROUP vertices for each dependent instance * * After the edges are set up the vertex's GV_CONFIGURED flag is set. If * there are problems, or if a service is mentioned in a dependency but does * not exist in the repository, the GV_CONFIGURED flag will be clear. * * The graph and all of its vertices are protected by the dgraph_lock mutex. * See restarter.c for more information. * * The properties of an instance fall into two classes: immediate and * snapshotted. Immediate properties should have an immediate effect when * changed. Snapshotted properties should be read from a snapshot, so they * only change when the snapshot changes. The immediate properties used by * the graph engine are general/enabled, general/restarter, and the properties * in the restarter_actions property group. Since they are immediate, they * are not read out of a snapshot. The snapshotted properties used by the * graph engine are those in the property groups with type "dependency" and * are read out of the "running" snapshot. The "running" snapshot is created * by the the graph engine as soon as possible, and it is updated, along with * in-core copies of the data (dependency information for the graph engine) on * receipt of the refresh command from svcadm. In addition, the graph engine * updates the "start" snapshot from the "running" snapshot whenever a service * comes online. * * When a DISABLE event is requested by the administrator, svc.startd shutdown * the dependents first before shutting down the requested service. * In graph_enable_by_vertex, we create a subtree that contains the dependent * vertices by marking those vertices with the GV_TOOFFLINE flag. And we mark * the vertex to disable with the GV_TODISABLE flag. Once the tree is created, * we send the _ADMIN_DISABLE event to the leaves. The leaves will then * transition from STATE_ONLINE/STATE_DEGRADED to STATE_OFFLINE/STATE_MAINT. * In gt_enter_offline and gt_enter_maint if the vertex was in a subtree then * we clear the GV_TOOFFLINE flag and walk the dependencies to offline the new * exposed leaves. We do the same until we reach the last leaf (the one with * the GV_TODISABLE flag). If the vertex to disable is also part of a larger * subtree (eg. multiple DISABLE events on vertices in the same subtree) then * once the first vertex is disabled (GV_TODISABLE flag is removed), we * continue to propagate the offline event to the vertex's dependencies. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "startd.h" #include "protocol.h" #define MILESTONE_NONE ((graph_vertex_t *)1) #define CONSOLE_LOGIN_FMRI "svc:/system/console-login:default" #define FS_MINIMAL_FMRI "svc:/system/filesystem/minimal:default" #define VERTEX_REMOVED 0 /* vertex has been freed */ #define VERTEX_INUSE 1 /* vertex is still in use */ /* * Services in these states are not considered 'down' by the * milestone/shutdown code. */ #define up_state(state) ((state) == RESTARTER_STATE_ONLINE || \ (state) == RESTARTER_STATE_DEGRADED || \ (state) == RESTARTER_STATE_OFFLINE) static uu_list_pool_t *graph_edge_pool, *graph_vertex_pool; static uu_list_t *dgraph; static pthread_mutex_t dgraph_lock; /* * milestone indicates the current subgraph. When NULL, it is the entire * graph. When MILESTONE_NONE, it is the empty graph. Otherwise, it is all * services on which the target vertex depends. */ static graph_vertex_t *milestone = NULL; static boolean_t initial_milestone_set = B_FALSE; static pthread_cond_t initial_milestone_cv = PTHREAD_COND_INITIALIZER; /* protected by dgraph_lock */ static boolean_t sulogin_thread_running = B_FALSE; static boolean_t sulogin_running = B_FALSE; static boolean_t console_login_ready = B_FALSE; /* Number of services to come down to complete milestone transition. */ static uint_t non_subgraph_svcs; /* * These variables indicate what should be done when we reach the milestone * target milestone, i.e., when non_subgraph_svcs == 0. They are acted upon in * dgraph_set_instance_state(). */ static int halting = -1; static boolean_t go_single_user_mode = B_FALSE; static boolean_t go_to_level1 = B_FALSE; /* * This tracks the legacy runlevel to ensure we signal init and manage * utmpx entries correctly. */ static char current_runlevel = '\0'; /* Number of single user threads currently running */ static pthread_mutex_t single_user_thread_lock; static int single_user_thread_count = 0; /* Statistics for dependency cycle-checking */ static u_longlong_t dep_inserts = 0; static u_longlong_t dep_cycle_ns = 0; static u_longlong_t dep_insert_ns = 0; static const char * const emsg_invalid_restarter = "Transitioning %s to maintenance, restarter FMRI %s is invalid " "(see 'svcs -xv' for details).\n"; static const char * const console_login_fmri = CONSOLE_LOGIN_FMRI; static const char * const single_user_fmri = SCF_MILESTONE_SINGLE_USER; static const char * const multi_user_fmri = SCF_MILESTONE_MULTI_USER; static const char * const multi_user_svr_fmri = SCF_MILESTONE_MULTI_USER_SERVER; /* * These services define the system being "up". If none of them can come * online, then we will run sulogin on the console. Note that the install ones * are for the miniroot and when installing CDs after the first. can_come_up() * does the decision making, and an sulogin_thread() runs sulogin, which can be * started by dgraph_set_instance_state() or single_user_thread(). * * NOTE: can_come_up() relies on SCF_MILESTONE_SINGLE_USER being the first * entry, which is only used when booting_to_single_user (boot -s) is set. * This is because when doing a "boot -s", sulogin is started from specials.c * after milestone/single-user comes online, for backwards compatibility. * In this case, SCF_MILESTONE_SINGLE_USER needs to be part of up_svcs * to ensure sulogin will be spawned if milestone/single-user cannot be reached. */ static const char * const up_svcs[] = { SCF_MILESTONE_SINGLE_USER, CONSOLE_LOGIN_FMRI, "svc:/system/install-setup:default", "svc:/system/install:default", NULL }; /* This array must have an element for each non-NULL element of up_svcs[]. */ static graph_vertex_t *up_svcs_p[] = { NULL, NULL, NULL, NULL }; /* These are for seed repository magic. See can_come_up(). */ static const char * const manifest_import = "svc:/system/manifest-import:default"; static graph_vertex_t *manifest_import_p = NULL; static char target_milestone_as_runlevel(void); static void graph_runlevel_changed(char rl, int online); static int dgraph_set_milestone(const char *, scf_handle_t *, boolean_t); static boolean_t should_be_in_subgraph(graph_vertex_t *v); static int mark_subtree(graph_edge_t *, void *); static boolean_t insubtree_dependents_down(graph_vertex_t *); /* * graph_vertex_compare() * This function can compare either int *id or * graph_vertex_t *gv * values, as the vertex id is always the first element of a * graph_vertex structure. */ /* ARGSUSED */ static int graph_vertex_compare(const void *lc_arg, const void *rc_arg, void *private) { int lc_id = ((const graph_vertex_t *)lc_arg)->gv_id; int rc_id = *(int *)rc_arg; if (lc_id > rc_id) return (1); if (lc_id < rc_id) return (-1); return (0); } void graph_init() { graph_edge_pool = startd_list_pool_create("graph_edges", sizeof (graph_edge_t), offsetof(graph_edge_t, ge_link), NULL, UU_LIST_POOL_DEBUG); assert(graph_edge_pool != NULL); graph_vertex_pool = startd_list_pool_create("graph_vertices", sizeof (graph_vertex_t), offsetof(graph_vertex_t, gv_link), graph_vertex_compare, UU_LIST_POOL_DEBUG); assert(graph_vertex_pool != NULL); (void) pthread_mutex_init(&dgraph_lock, &mutex_attrs); (void) pthread_mutex_init(&single_user_thread_lock, &mutex_attrs); dgraph = startd_list_create(graph_vertex_pool, NULL, UU_LIST_SORTED); assert(dgraph != NULL); if (!st->st_initial) current_runlevel = utmpx_get_runlevel(); log_framework(LOG_DEBUG, "Initialized graph\n"); } static graph_vertex_t * vertex_get_by_name(const char *name) { int id; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); id = dict_lookup_byname(name); if (id == -1) return (NULL); return (uu_list_find(dgraph, &id, NULL, NULL)); } static graph_vertex_t * vertex_get_by_id(int id) { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); if (id == -1) return (NULL); return (uu_list_find(dgraph, &id, NULL, NULL)); } /* * Creates a new vertex with the given name, adds it to the graph, and returns * a pointer to it. The graph lock must be held by this thread on entry. */ static graph_vertex_t * graph_add_vertex(const char *name) { int id; graph_vertex_t *v; void *p; uu_list_index_t idx; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); id = dict_insert(name); v = startd_zalloc(sizeof (*v)); v->gv_id = id; v->gv_name = startd_alloc(strlen(name) + 1); (void) strcpy(v->gv_name, name); v->gv_dependencies = startd_list_create(graph_edge_pool, v, 0); v->gv_dependents = startd_list_create(graph_edge_pool, v, 0); p = uu_list_find(dgraph, &id, NULL, &idx); assert(p == NULL); uu_list_node_init(v, &v->gv_link, graph_vertex_pool); uu_list_insert(dgraph, v, idx); return (v); } /* * Removes v from the graph and frees it. The graph should be locked by this * thread, and v should have no edges associated with it. */ static void graph_remove_vertex(graph_vertex_t *v) { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert(uu_list_numnodes(v->gv_dependencies) == 0); assert(uu_list_numnodes(v->gv_dependents) == 0); assert(v->gv_refs == 0); startd_free(v->gv_name, strlen(v->gv_name) + 1); uu_list_destroy(v->gv_dependencies); uu_list_destroy(v->gv_dependents); uu_list_remove(dgraph, v); startd_free(v, sizeof (graph_vertex_t)); } static void graph_add_edge(graph_vertex_t *fv, graph_vertex_t *tv) { graph_edge_t *e, *re; int r; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); e = startd_alloc(sizeof (graph_edge_t)); re = startd_alloc(sizeof (graph_edge_t)); e->ge_parent = fv; e->ge_vertex = tv; re->ge_parent = tv; re->ge_vertex = fv; uu_list_node_init(e, &e->ge_link, graph_edge_pool); r = uu_list_insert_before(fv->gv_dependencies, NULL, e); assert(r == 0); uu_list_node_init(re, &re->ge_link, graph_edge_pool); r = uu_list_insert_before(tv->gv_dependents, NULL, re); assert(r == 0); } static void graph_remove_edge(graph_vertex_t *v, graph_vertex_t *dv) { graph_edge_t *e; for (e = uu_list_first(v->gv_dependencies); e != NULL; e = uu_list_next(v->gv_dependencies, e)) { if (e->ge_vertex == dv) { uu_list_remove(v->gv_dependencies, e); startd_free(e, sizeof (graph_edge_t)); break; } } for (e = uu_list_first(dv->gv_dependents); e != NULL; e = uu_list_next(dv->gv_dependents, e)) { if (e->ge_vertex == v) { uu_list_remove(dv->gv_dependents, e); startd_free(e, sizeof (graph_edge_t)); break; } } } static void remove_inst_vertex(graph_vertex_t *v) { graph_edge_t *e; graph_vertex_t *sv; int i; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert(uu_list_numnodes(v->gv_dependents) == 1); assert(uu_list_numnodes(v->gv_dependencies) == 0); assert(v->gv_refs == 0); assert((v->gv_flags & GV_CONFIGURED) == 0); e = uu_list_first(v->gv_dependents); sv = e->ge_vertex; graph_remove_edge(sv, v); for (i = 0; up_svcs[i] != NULL; ++i) { if (up_svcs_p[i] == v) up_svcs_p[i] = NULL; } if (manifest_import_p == v) manifest_import_p = NULL; graph_remove_vertex(v); if (uu_list_numnodes(sv->gv_dependencies) == 0 && uu_list_numnodes(sv->gv_dependents) == 0 && sv->gv_refs == 0) graph_remove_vertex(sv); } static void graph_walk_dependents(graph_vertex_t *v, void (*func)(graph_vertex_t *, void *), void *arg) { graph_edge_t *e; for (e = uu_list_first(v->gv_dependents); e != NULL; e = uu_list_next(v->gv_dependents, e)) func(e->ge_vertex, arg); } static void graph_walk_dependencies(graph_vertex_t *v, void (*func)(graph_vertex_t *, void *), void *arg) { graph_edge_t *e; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); for (e = uu_list_first(v->gv_dependencies); e != NULL; e = uu_list_next(v->gv_dependencies, e)) { func(e->ge_vertex, arg); } } /* * Generic graph walking function. * * Given a vertex, this function will walk either dependencies * (WALK_DEPENDENCIES) or dependents (WALK_DEPENDENTS) of a vertex recursively * for the entire graph. It will avoid cycles and never visit the same vertex * twice. * * We avoid traversing exclusion dependencies, because they are allowed to * create cycles in the graph. When propagating satisfiability, there is no * need to walk exclusion dependencies because exclude_all_satisfied() doesn't * test for satisfiability. * * The walker takes two callbacks. The first is called before examining the * dependents of each vertex. The second is called on each vertex after * examining its dependents. This allows is_path_to() to construct a path only * after the target vertex has been found. */ typedef enum { WALK_DEPENDENTS, WALK_DEPENDENCIES } graph_walk_dir_t; typedef int (*graph_walk_cb_t)(graph_vertex_t *, void *); typedef struct graph_walk_info { graph_walk_dir_t gi_dir; uchar_t *gi_visited; /* vertex bitmap */ int (*gi_pre)(graph_vertex_t *, void *); void (*gi_post)(graph_vertex_t *, void *); void *gi_arg; /* callback arg */ int gi_ret; /* return value */ } graph_walk_info_t; static int graph_walk_recurse(graph_edge_t *e, graph_walk_info_t *gip) { uu_list_t *list; int r; graph_vertex_t *v = e->ge_vertex; int i; uint_t b; i = v->gv_id / 8; b = 1 << (v->gv_id % 8); /* * Check to see if we've visited this vertex already. */ if (gip->gi_visited[i] & b) return (UU_WALK_NEXT); gip->gi_visited[i] |= b; /* * Don't follow exclusions. */ if (v->gv_type == GVT_GROUP && v->gv_depgroup == DEPGRP_EXCLUDE_ALL) return (UU_WALK_NEXT); /* * Call pre-visit callback. If this doesn't terminate the walk, * continue search. */ if ((gip->gi_ret = gip->gi_pre(v, gip->gi_arg)) == UU_WALK_NEXT) { /* * Recurse using appropriate list. */ if (gip->gi_dir == WALK_DEPENDENTS) list = v->gv_dependents; else list = v->gv_dependencies; r = uu_list_walk(list, (uu_walk_fn_t *)graph_walk_recurse, gip, 0); assert(r == 0); } /* * Callbacks must return either UU_WALK_NEXT or UU_WALK_DONE. */ assert(gip->gi_ret == UU_WALK_NEXT || gip->gi_ret == UU_WALK_DONE); /* * If given a post-callback, call the function for every vertex. */ if (gip->gi_post != NULL) (void) gip->gi_post(v, gip->gi_arg); /* * Preserve the callback's return value. If the callback returns * UU_WALK_DONE, then we propagate that to the caller in order to * terminate the walk. */ return (gip->gi_ret); } static void graph_walk(graph_vertex_t *v, graph_walk_dir_t dir, int (*pre)(graph_vertex_t *, void *), void (*post)(graph_vertex_t *, void *), void *arg) { graph_walk_info_t gi; graph_edge_t fake; size_t sz = dictionary->dict_new_id / 8 + 1; gi.gi_visited = startd_zalloc(sz); gi.gi_pre = pre; gi.gi_post = post; gi.gi_arg = arg; gi.gi_dir = dir; gi.gi_ret = 0; /* * Fake up an edge for the first iteration */ fake.ge_vertex = v; (void) graph_walk_recurse(&fake, &gi); startd_free(gi.gi_visited, sz); } typedef struct child_search { int id; /* id of vertex to look for */ uint_t depth; /* recursion depth */ /* * While the vertex is not found, path is NULL. After the search, if * the vertex was found then path should point to a -1-terminated * array of vertex id's which constitute the path to the vertex. */ int *path; } child_search_t; static int child_pre(graph_vertex_t *v, void *arg) { child_search_t *cs = arg; cs->depth++; if (v->gv_id == cs->id) { cs->path = startd_alloc((cs->depth + 1) * sizeof (int)); cs->path[cs->depth] = -1; return (UU_WALK_DONE); } return (UU_WALK_NEXT); } static void child_post(graph_vertex_t *v, void *arg) { child_search_t *cs = arg; cs->depth--; if (cs->path != NULL) cs->path[cs->depth] = v->gv_id; } /* * Look for a path from from to to. If one exists, returns a pointer to * a NULL-terminated array of pointers to the vertices along the path. If * there is no path, returns NULL. */ static int * is_path_to(graph_vertex_t *from, graph_vertex_t *to) { child_search_t cs; cs.id = to->gv_id; cs.depth = 0; cs.path = NULL; graph_walk(from, WALK_DEPENDENCIES, child_pre, child_post, &cs); return (cs.path); } /* * Given an array of int's as returned by is_path_to, allocates a string of * their names joined by newlines. Returns the size of the allocated buffer * in *sz and frees path. */ static void path_to_str(int *path, char **cpp, size_t *sz) { int i; graph_vertex_t *v; size_t allocd, new_allocd; char *new, *name; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert(path[0] != -1); allocd = 1; *cpp = startd_alloc(1); (*cpp)[0] = '\0'; for (i = 0; path[i] != -1; ++i) { name = NULL; v = vertex_get_by_id(path[i]); if (v == NULL) name = ""; else if (v->gv_type == GVT_INST || v->gv_type == GVT_SVC) name = v->gv_name; if (name != NULL) { new_allocd = allocd + strlen(name) + 1; new = startd_alloc(new_allocd); (void) strcpy(new, *cpp); (void) strcat(new, name); (void) strcat(new, "\n"); startd_free(*cpp, allocd); *cpp = new; allocd = new_allocd; } } startd_free(path, sizeof (int) * (i + 1)); *sz = allocd; } /* * This function along with run_sulogin() implements an exclusion relationship * between system/console-login and sulogin. run_sulogin() will fail if * system/console-login is online, and the graph engine should call * graph_clogin_start() to bring system/console-login online, which defers the * start if sulogin is running. */ static void graph_clogin_start(graph_vertex_t *v) { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); if (sulogin_running) console_login_ready = B_TRUE; else vertex_send_event(v, RESTARTER_EVENT_TYPE_START); } static void graph_su_start(graph_vertex_t *v) { /* * /etc/inittab used to have the initial /sbin/rcS as a 'sysinit' * entry with a runlevel of 'S', before jumping to the final * target runlevel (as set in initdefault). We mimic that legacy * behavior here. */ utmpx_set_runlevel('S', '0', B_FALSE); vertex_send_event(v, RESTARTER_EVENT_TYPE_START); } static void graph_post_su_online(void) { graph_runlevel_changed('S', 1); } static void graph_post_su_disable(void) { graph_runlevel_changed('S', 0); } static void graph_post_mu_online(void) { graph_runlevel_changed('2', 1); } static void graph_post_mu_disable(void) { graph_runlevel_changed('2', 0); } static void graph_post_mus_online(void) { graph_runlevel_changed('3', 1); } static void graph_post_mus_disable(void) { graph_runlevel_changed('3', 0); } static struct special_vertex_info { const char *name; void (*start_f)(graph_vertex_t *); void (*post_online_f)(void); void (*post_disable_f)(void); } special_vertices[] = { { CONSOLE_LOGIN_FMRI, graph_clogin_start, NULL, NULL }, { SCF_MILESTONE_SINGLE_USER, graph_su_start, graph_post_su_online, graph_post_su_disable }, { SCF_MILESTONE_MULTI_USER, NULL, graph_post_mu_online, graph_post_mu_disable }, { SCF_MILESTONE_MULTI_USER_SERVER, NULL, graph_post_mus_online, graph_post_mus_disable }, { NULL }, }; void vertex_send_event(graph_vertex_t *v, restarter_event_type_t e) { switch (e) { case RESTARTER_EVENT_TYPE_ADD_INSTANCE: assert(v->gv_state == RESTARTER_STATE_UNINIT); MUTEX_LOCK(&st->st_load_lock); st->st_load_instances++; MUTEX_UNLOCK(&st->st_load_lock); break; case RESTARTER_EVENT_TYPE_ENABLE: log_framework(LOG_DEBUG, "Enabling %s.\n", v->gv_name); assert(v->gv_state == RESTARTER_STATE_UNINIT || v->gv_state == RESTARTER_STATE_DISABLED || v->gv_state == RESTARTER_STATE_MAINT); break; case RESTARTER_EVENT_TYPE_DISABLE: case RESTARTER_EVENT_TYPE_ADMIN_DISABLE: log_framework(LOG_DEBUG, "Disabling %s.\n", v->gv_name); assert(v->gv_state != RESTARTER_STATE_DISABLED); break; case RESTARTER_EVENT_TYPE_STOP: log_framework(LOG_DEBUG, "Stopping %s.\n", v->gv_name); assert(v->gv_state == RESTARTER_STATE_DEGRADED || v->gv_state == RESTARTER_STATE_ONLINE); break; case RESTARTER_EVENT_TYPE_START: log_framework(LOG_DEBUG, "Starting %s.\n", v->gv_name); assert(v->gv_state == RESTARTER_STATE_OFFLINE); break; case RESTARTER_EVENT_TYPE_REMOVE_INSTANCE: case RESTARTER_EVENT_TYPE_ADMIN_DEGRADED: case RESTARTER_EVENT_TYPE_ADMIN_REFRESH: case RESTARTER_EVENT_TYPE_ADMIN_RESTART: case RESTARTER_EVENT_TYPE_ADMIN_MAINT_OFF: case RESTARTER_EVENT_TYPE_ADMIN_MAINT_ON: case RESTARTER_EVENT_TYPE_ADMIN_MAINT_ON_IMMEDIATE: case RESTARTER_EVENT_TYPE_DEPENDENCY_CYCLE: case RESTARTER_EVENT_TYPE_INVALID_DEPENDENCY: break; default: #ifndef NDEBUG uu_warn("%s:%d: Bad event %d.\n", __FILE__, __LINE__, e); #endif abort(); } restarter_protocol_send_event(v->gv_name, v->gv_restarter_channel, e); } static void graph_unset_restarter(graph_vertex_t *v) { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert(v->gv_flags & GV_CONFIGURED); vertex_send_event(v, RESTARTER_EVENT_TYPE_REMOVE_INSTANCE); if (v->gv_restarter_id != -1) { graph_vertex_t *rv; rv = vertex_get_by_id(v->gv_restarter_id); graph_remove_edge(v, rv); } v->gv_restarter_id = -1; v->gv_restarter_channel = NULL; } /* * Return VERTEX_REMOVED when the vertex passed in argument is deleted from the * dgraph otherwise return VERTEX_INUSE. */ static int free_if_unrefed(graph_vertex_t *v) { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); if (v->gv_refs > 0) return (VERTEX_INUSE); if (v->gv_type == GVT_SVC && uu_list_numnodes(v->gv_dependents) == 0 && uu_list_numnodes(v->gv_dependencies) == 0) { graph_remove_vertex(v); return (VERTEX_REMOVED); } else if (v->gv_type == GVT_INST && (v->gv_flags & GV_CONFIGURED) == 0 && uu_list_numnodes(v->gv_dependents) == 1 && uu_list_numnodes(v->gv_dependencies) == 0) { remove_inst_vertex(v); return (VERTEX_REMOVED); } return (VERTEX_INUSE); } static void delete_depgroup(graph_vertex_t *v) { graph_edge_t *e; graph_vertex_t *dv; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert(v->gv_type == GVT_GROUP); assert(uu_list_numnodes(v->gv_dependents) == 0); while ((e = uu_list_first(v->gv_dependencies)) != NULL) { dv = e->ge_vertex; graph_remove_edge(v, dv); switch (dv->gv_type) { case GVT_INST: /* instance dependency */ case GVT_SVC: /* service dependency */ (void) free_if_unrefed(dv); break; case GVT_FILE: /* file dependency */ assert(uu_list_numnodes(dv->gv_dependencies) == 0); if (uu_list_numnodes(dv->gv_dependents) == 0) graph_remove_vertex(dv); break; default: #ifndef NDEBUG uu_warn("%s:%d: Unexpected node type %d", __FILE__, __LINE__, dv->gv_type); #endif abort(); } } graph_remove_vertex(v); } static int delete_instance_deps_cb(graph_edge_t *e, void **ptrs) { graph_vertex_t *v = ptrs[0]; boolean_t delete_restarter_dep = (boolean_t)ptrs[1]; graph_vertex_t *dv; dv = e->ge_vertex; /* * We have four possibilities here: * - GVT_INST: restarter * - GVT_GROUP - GVT_INST: instance dependency * - GVT_GROUP - GVT_SVC - GV_INST: service dependency * - GVT_GROUP - GVT_FILE: file dependency */ switch (dv->gv_type) { case GVT_INST: /* restarter */ assert(dv->gv_id == v->gv_restarter_id); if (delete_restarter_dep) graph_remove_edge(v, dv); break; case GVT_GROUP: /* pg dependency */ graph_remove_edge(v, dv); delete_depgroup(dv); break; case GVT_FILE: /* These are currently not direct dependencies */ default: #ifndef NDEBUG uu_warn("%s:%d: Bad vertex type %d.\n", __FILE__, __LINE__, dv->gv_type); #endif abort(); } return (UU_WALK_NEXT); } static void delete_instance_dependencies(graph_vertex_t *v, boolean_t delete_restarter_dep) { void *ptrs[2]; int r; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert(v->gv_type == GVT_INST); ptrs[0] = v; ptrs[1] = (void *)delete_restarter_dep; r = uu_list_walk(v->gv_dependencies, (uu_walk_fn_t *)delete_instance_deps_cb, &ptrs, UU_WALK_ROBUST); assert(r == 0); } /* * int graph_insert_vertex_unconfigured() * Insert a vertex without sending any restarter events. If the vertex * already exists or creation is successful, return a pointer to it in *vp. * * If type is not GVT_GROUP, dt can remain unset. * * Returns 0, EEXIST, or EINVAL if the arguments are invalid (i.e., fmri * doesn't agree with type, or type doesn't agree with dt). */ static int graph_insert_vertex_unconfigured(const char *fmri, gv_type_t type, depgroup_type_t dt, restarter_error_t rt, graph_vertex_t **vp) { int r; int i; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); switch (type) { case GVT_SVC: case GVT_INST: if (strncmp(fmri, "svc:", sizeof ("svc:") - 1) != 0) return (EINVAL); break; case GVT_FILE: if (strncmp(fmri, "file:", sizeof ("file:") - 1) != 0) return (EINVAL); break; case GVT_GROUP: if (dt <= 0 || rt < 0) return (EINVAL); break; default: #ifndef NDEBUG uu_warn("%s:%d: Unknown type %d.\n", __FILE__, __LINE__, type); #endif abort(); } *vp = vertex_get_by_name(fmri); if (*vp != NULL) return (EEXIST); *vp = graph_add_vertex(fmri); (*vp)->gv_type = type; (*vp)->gv_depgroup = dt; (*vp)->gv_restart = rt; (*vp)->gv_flags = 0; (*vp)->gv_state = RESTARTER_STATE_NONE; for (i = 0; special_vertices[i].name != NULL; ++i) { if (strcmp(fmri, special_vertices[i].name) == 0) { (*vp)->gv_start_f = special_vertices[i].start_f; (*vp)->gv_post_online_f = special_vertices[i].post_online_f; (*vp)->gv_post_disable_f = special_vertices[i].post_disable_f; break; } } (*vp)->gv_restarter_id = -1; (*vp)->gv_restarter_channel = 0; if (type == GVT_INST) { char *sfmri; graph_vertex_t *sv; sfmri = inst_fmri_to_svc_fmri(fmri); sv = vertex_get_by_name(sfmri); if (sv == NULL) { r = graph_insert_vertex_unconfigured(sfmri, GVT_SVC, 0, 0, &sv); assert(r == 0); } startd_free(sfmri, max_scf_fmri_size); graph_add_edge(sv, *vp); } /* * If this vertex is in the subgraph, mark it as so, for both * GVT_INST and GVT_SERVICE verteces. * A GVT_SERVICE vertex can only be in the subgraph if another instance * depends on it, in which case it's already been added to the graph * and marked as in the subgraph (by refresh_vertex()). If a * GVT_SERVICE vertex was freshly added (by the code above), it means * that it has no dependents, and cannot be in the subgraph. * Regardless of this, we still check that gv_flags includes * GV_INSUBGRAPH in the event that future behavior causes the above * code to add a GVT_SERVICE vertex which should be in the subgraph. */ (*vp)->gv_flags |= (should_be_in_subgraph(*vp)? GV_INSUBGRAPH : 0); return (0); } /* * Returns 0 on success or ELOOP if the dependency would create a cycle. */ static int graph_insert_dependency(graph_vertex_t *fv, graph_vertex_t *tv, int **pathp) { hrtime_t now; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); /* cycle detection */ now = gethrtime(); /* Don't follow exclusions. */ if (!(fv->gv_type == GVT_GROUP && fv->gv_depgroup == DEPGRP_EXCLUDE_ALL)) { *pathp = is_path_to(tv, fv); if (*pathp) return (ELOOP); } dep_cycle_ns += gethrtime() - now; ++dep_inserts; now = gethrtime(); graph_add_edge(fv, tv); dep_insert_ns += gethrtime() - now; /* Check if the dependency adds the "to" vertex to the subgraph */ tv->gv_flags |= (should_be_in_subgraph(tv) ? GV_INSUBGRAPH : 0); return (0); } static int inst_running(graph_vertex_t *v) { assert(v->gv_type == GVT_INST); if (v->gv_state == RESTARTER_STATE_ONLINE || v->gv_state == RESTARTER_STATE_DEGRADED) return (1); return (0); } /* * The dependency evaluation functions return * 1 - dependency satisfied * 0 - dependency unsatisfied * -1 - dependency unsatisfiable (without administrator intervention) * * The functions also take a boolean satbility argument. When true, the * functions may recurse in order to determine satisfiability. */ static int require_any_satisfied(graph_vertex_t *, boolean_t); static int dependency_satisfied(graph_vertex_t *, boolean_t); /* * A require_all dependency is unsatisfied if any elements are unsatisfied. It * is unsatisfiable if any elements are unsatisfiable. */ static int require_all_satisfied(graph_vertex_t *groupv, boolean_t satbility) { graph_edge_t *edge; int i; boolean_t any_unsatisfied; if (uu_list_numnodes(groupv->gv_dependencies) == 0) return (1); any_unsatisfied = B_FALSE; for (edge = uu_list_first(groupv->gv_dependencies); edge != NULL; edge = uu_list_next(groupv->gv_dependencies, edge)) { i = dependency_satisfied(edge->ge_vertex, satbility); if (i == 1) continue; log_framework2(LOG_DEBUG, DEBUG_DEPENDENCIES, "require_all(%s): %s is unsatisfi%s.\n", groupv->gv_name, edge->ge_vertex->gv_name, i == 0 ? "ed" : "able"); if (!satbility) return (0); if (i == -1) return (-1); any_unsatisfied = B_TRUE; } return (any_unsatisfied ? 0 : 1); } /* * A require_any dependency is satisfied if any element is satisfied. It is * satisfiable if any element is satisfiable. */ static int require_any_satisfied(graph_vertex_t *groupv, boolean_t satbility) { graph_edge_t *edge; int s; boolean_t satisfiable; if (uu_list_numnodes(groupv->gv_dependencies) == 0) return (1); satisfiable = B_FALSE; for (edge = uu_list_first(groupv->gv_dependencies); edge != NULL; edge = uu_list_next(groupv->gv_dependencies, edge)) { s = dependency_satisfied(edge->ge_vertex, satbility); if (s == 1) return (1); log_framework2(LOG_DEBUG, DEBUG_DEPENDENCIES, "require_any(%s): %s is unsatisfi%s.\n", groupv->gv_name, edge->ge_vertex->gv_name, s == 0 ? "ed" : "able"); if (satbility && s == 0) satisfiable = B_TRUE; } return (!satbility || satisfiable ? 0 : -1); } /* * An optional_all dependency only considers elements which are configured, * enabled, and not in maintenance. If any are unsatisfied, then the dependency * is unsatisfied. * * Offline dependencies which are waiting for a dependency to come online are * unsatisfied. Offline dependences which cannot possibly come online * (unsatisfiable) are always considered satisfied. */ static int optional_all_satisfied(graph_vertex_t *groupv, boolean_t satbility) { graph_edge_t *edge; graph_vertex_t *v; boolean_t any_qualified; boolean_t any_unsatisfied; int i; any_qualified = B_FALSE; any_unsatisfied = B_FALSE; for (edge = uu_list_first(groupv->gv_dependencies); edge != NULL; edge = uu_list_next(groupv->gv_dependencies, edge)) { v = edge->ge_vertex; switch (v->gv_type) { case GVT_INST: /* Skip missing or disabled instances */ if ((v->gv_flags & (GV_CONFIGURED | GV_ENABLED)) != (GV_CONFIGURED | GV_ENABLED)) continue; if (v->gv_state == RESTARTER_STATE_MAINT) continue; any_qualified = B_TRUE; if (v->gv_state == RESTARTER_STATE_OFFLINE) { /* * For offline dependencies, treat unsatisfiable * as satisfied. */ i = dependency_satisfied(v, B_TRUE); if (i == -1) i = 1; } else if (v->gv_state == RESTARTER_STATE_DISABLED) { /* * The service is enabled, but hasn't * transitioned out of disabled yet. Treat it * as unsatisfied (not unsatisfiable). */ i = 0; } else { i = dependency_satisfied(v, satbility); } break; case GVT_FILE: any_qualified = B_TRUE; i = dependency_satisfied(v, satbility); break; case GVT_SVC: { boolean_t svc_any_qualified; boolean_t svc_satisfied; boolean_t svc_satisfiable; graph_vertex_t *v2; graph_edge_t *e2; svc_any_qualified = B_FALSE; svc_satisfied = B_FALSE; svc_satisfiable = B_FALSE; for (e2 = uu_list_first(v->gv_dependencies); e2 != NULL; e2 = uu_list_next(v->gv_dependencies, e2)) { v2 = e2->ge_vertex; assert(v2->gv_type == GVT_INST); if ((v2->gv_flags & (GV_CONFIGURED | GV_ENABLED)) != (GV_CONFIGURED | GV_ENABLED)) continue; if (v2->gv_state == RESTARTER_STATE_MAINT) continue; svc_any_qualified = B_TRUE; if (v2->gv_state == RESTARTER_STATE_OFFLINE) { /* * For offline dependencies, treat * unsatisfiable as satisfied. */ i = dependency_satisfied(v2, B_TRUE); if (i == -1) i = 1; } else if (v2->gv_state == RESTARTER_STATE_DISABLED) { i = 0; } else { i = dependency_satisfied(v2, satbility); } if (i == 1) { svc_satisfied = B_TRUE; break; } if (i == 0) svc_satisfiable = B_TRUE; } if (!svc_any_qualified) continue; any_qualified = B_TRUE; if (svc_satisfied) { i = 1; } else if (svc_satisfiable) { i = 0; } else { i = -1; } break; } case GVT_GROUP: default: #ifndef NDEBUG uu_warn("%s:%d: Unexpected vertex type %d.\n", __FILE__, __LINE__, v->gv_type); #endif abort(); } if (i == 1) continue; log_framework2(LOG_DEBUG, DEBUG_DEPENDENCIES, "optional_all(%s): %s is unsatisfi%s.\n", groupv->gv_name, v->gv_name, i == 0 ? "ed" : "able"); if (!satbility) return (0); if (i == -1) return (-1); any_unsatisfied = B_TRUE; } if (!any_qualified) return (1); return (any_unsatisfied ? 0 : 1); } /* * An exclude_all dependency is unsatisfied if any non-service element is * satisfied or any service instance which is configured, enabled, and not in * maintenance is satisfied. Usually when unsatisfied, it is also * unsatisfiable. */ #define LOG_EXCLUDE(u, v) \ log_framework2(LOG_DEBUG, DEBUG_DEPENDENCIES, \ "exclude_all(%s): %s is satisfied.\n", \ (u)->gv_name, (v)->gv_name) /* ARGSUSED */ static int exclude_all_satisfied(graph_vertex_t *groupv, boolean_t satbility) { graph_edge_t *edge, *e2; graph_vertex_t *v, *v2; for (edge = uu_list_first(groupv->gv_dependencies); edge != NULL; edge = uu_list_next(groupv->gv_dependencies, edge)) { v = edge->ge_vertex; switch (v->gv_type) { case GVT_INST: if ((v->gv_flags & GV_CONFIGURED) == 0) continue; switch (v->gv_state) { case RESTARTER_STATE_ONLINE: case RESTARTER_STATE_DEGRADED: LOG_EXCLUDE(groupv, v); return (v->gv_flags & GV_ENABLED ? -1 : 0); case RESTARTER_STATE_OFFLINE: case RESTARTER_STATE_UNINIT: LOG_EXCLUDE(groupv, v); return (0); case RESTARTER_STATE_DISABLED: case RESTARTER_STATE_MAINT: continue; default: #ifndef NDEBUG uu_warn("%s:%d: Unexpected vertex state %d.\n", __FILE__, __LINE__, v->gv_state); #endif abort(); } /* NOTREACHED */ case GVT_SVC: break; case GVT_FILE: if (!file_ready(v)) continue; LOG_EXCLUDE(groupv, v); return (-1); case GVT_GROUP: default: #ifndef NDEBUG uu_warn("%s:%d: Unexpected vertex type %d.\n", __FILE__, __LINE__, v->gv_type); #endif abort(); } /* v represents a service */ if (uu_list_numnodes(v->gv_dependencies) == 0) continue; for (e2 = uu_list_first(v->gv_dependencies); e2 != NULL; e2 = uu_list_next(v->gv_dependencies, e2)) { v2 = e2->ge_vertex; assert(v2->gv_type == GVT_INST); if ((v2->gv_flags & GV_CONFIGURED) == 0) continue; switch (v2->gv_state) { case RESTARTER_STATE_ONLINE: case RESTARTER_STATE_DEGRADED: LOG_EXCLUDE(groupv, v2); return (v2->gv_flags & GV_ENABLED ? -1 : 0); case RESTARTER_STATE_OFFLINE: case RESTARTER_STATE_UNINIT: LOG_EXCLUDE(groupv, v2); return (0); case RESTARTER_STATE_DISABLED: case RESTARTER_STATE_MAINT: continue; default: #ifndef NDEBUG uu_warn("%s:%d: Unexpected vertex type %d.\n", __FILE__, __LINE__, v2->gv_type); #endif abort(); } } } return (1); } /* * int instance_satisfied() * Determine if all the dependencies are satisfied for the supplied instance * vertex. Return 1 if they are, 0 if they aren't, and -1 if they won't be * without administrator intervention. */ static int instance_satisfied(graph_vertex_t *v, boolean_t satbility) { assert(v->gv_type == GVT_INST); assert(!inst_running(v)); return (require_all_satisfied(v, satbility)); } /* * Decide whether v can satisfy a dependency. v can either be a child of * a group vertex, or of an instance vertex. */ static int dependency_satisfied(graph_vertex_t *v, boolean_t satbility) { switch (v->gv_type) { case GVT_INST: if ((v->gv_flags & GV_CONFIGURED) == 0) { if (v->gv_flags & GV_DEATHROW) { /* * A dependency on an instance with GV_DEATHROW * flag is always considered as satisfied. */ return (1); } return (-1); } switch (v->gv_state) { case RESTARTER_STATE_ONLINE: case RESTARTER_STATE_DEGRADED: /* * An instance that goes offline because one of its * dependencies is in the process of being disabled, * should not be able to return online yet. Those * instances have the GV_TOOFFLINE flag and they can * not be used to satisfy dependency. */ if (v->gv_flags & GV_TOOFFLINE) return (0); return (1); case RESTARTER_STATE_OFFLINE: if (!satbility) return (0); return (instance_satisfied(v, satbility) != -1 ? 0 : -1); case RESTARTER_STATE_DISABLED: case RESTARTER_STATE_MAINT: return (-1); case RESTARTER_STATE_UNINIT: return (0); default: #ifndef NDEBUG uu_warn("%s:%d: Unexpected vertex state %d.\n", __FILE__, __LINE__, v->gv_state); #endif abort(); /* NOTREACHED */ } case GVT_SVC: if (uu_list_numnodes(v->gv_dependencies) == 0) return (-1); return (require_any_satisfied(v, satbility)); case GVT_FILE: /* i.e., we assume files will not be automatically generated */ return (file_ready(v) ? 1 : -1); case GVT_GROUP: break; default: #ifndef NDEBUG uu_warn("%s:%d: Unexpected node type %d.\n", __FILE__, __LINE__, v->gv_type); #endif abort(); /* NOTREACHED */ } switch (v->gv_depgroup) { case DEPGRP_REQUIRE_ANY: return (require_any_satisfied(v, satbility)); case DEPGRP_REQUIRE_ALL: return (require_all_satisfied(v, satbility)); case DEPGRP_OPTIONAL_ALL: return (optional_all_satisfied(v, satbility)); case DEPGRP_EXCLUDE_ALL: return (exclude_all_satisfied(v, satbility)); default: #ifndef NDEBUG uu_warn("%s:%d: Unknown dependency grouping %d.\n", __FILE__, __LINE__, v->gv_depgroup); #endif abort(); } } void graph_start_if_satisfied(graph_vertex_t *v) { if (v->gv_state == RESTARTER_STATE_OFFLINE && instance_satisfied(v, B_FALSE) == 1) { if (v->gv_start_f == NULL) vertex_send_event(v, RESTARTER_EVENT_TYPE_START); else v->gv_start_f(v); } } /* * propagate_satbility() * * This function is used when the given vertex changes state in such a way that * one of its dependents may become unsatisfiable. This happens when an * instance transitions between offline -> online, or from !running -> * maintenance, as well as when an instance is removed from the graph. * * We have to walk all the dependents, since optional_all dependencies several * levels up could become (un)satisfied, instead of unsatisfiable. For example, * * +-----+ optional_all +-----+ require_all +-----+ * | A |--------------->| B |-------------->| C | * +-----+ +-----+ +-----+ * * offline -> maintenance * * If C goes into maintenance, it's not enough simply to check B. Because A has * an optional dependency, what was previously an unsatisfiable situation is now * satisfied (B will never come online, even though its state hasn't changed). * * Note that it's not necessary to continue examining dependents after reaching * an optional_all dependency. It's not possible for an optional_all dependency * to change satisfiability without also coming online, in which case we get a * start event and propagation continues naturally. However, it does no harm to * continue propagating satisfiability (as it is a relatively rare event), and * keeps the walker code simple and generic. */ /*ARGSUSED*/ static int satbility_cb(graph_vertex_t *v, void *arg) { if (v->gv_type == GVT_INST) graph_start_if_satisfied(v); return (UU_WALK_NEXT); } static void propagate_satbility(graph_vertex_t *v) { graph_walk(v, WALK_DEPENDENTS, satbility_cb, NULL, NULL); } static void propagate_stop(graph_vertex_t *, void *); /* ARGSUSED */ static void propagate_start(graph_vertex_t *v, void *arg) { switch (v->gv_type) { case GVT_INST: graph_start_if_satisfied(v); break; case GVT_GROUP: if (v->gv_depgroup == DEPGRP_EXCLUDE_ALL) { graph_walk_dependents(v, propagate_stop, (void *)RERR_RESTART); break; } /* FALLTHROUGH */ case GVT_SVC: graph_walk_dependents(v, propagate_start, NULL); break; case GVT_FILE: #ifndef NDEBUG uu_warn("%s:%d: propagate_start() encountered GVT_FILE.\n", __FILE__, __LINE__); #endif abort(); /* NOTREACHED */ default: #ifndef NDEBUG uu_warn("%s:%d: Unknown vertex type %d.\n", __FILE__, __LINE__, v->gv_type); #endif abort(); } } static void propagate_stop(graph_vertex_t *v, void *arg) { graph_edge_t *e; graph_vertex_t *svc; restarter_error_t err = (restarter_error_t)arg; switch (v->gv_type) { case GVT_INST: /* Restarter */ if (err > RERR_NONE && inst_running(v)) vertex_send_event(v, RESTARTER_EVENT_TYPE_STOP); break; case GVT_SVC: graph_walk_dependents(v, propagate_stop, arg); break; case GVT_FILE: #ifndef NDEBUG uu_warn("%s:%d: propagate_stop() encountered GVT_FILE.\n", __FILE__, __LINE__); #endif abort(); /* NOTREACHED */ case GVT_GROUP: if (v->gv_depgroup == DEPGRP_EXCLUDE_ALL) { graph_walk_dependents(v, propagate_start, NULL); break; } if (err == RERR_NONE || err > v->gv_restart) break; assert(uu_list_numnodes(v->gv_dependents) == 1); e = uu_list_first(v->gv_dependents); svc = e->ge_vertex; if (inst_running(svc)) vertex_send_event(svc, RESTARTER_EVENT_TYPE_STOP); break; default: #ifndef NDEBUG uu_warn("%s:%d: Unknown vertex type %d.\n", __FILE__, __LINE__, v->gv_type); #endif abort(); } } static void offline_vertex(graph_vertex_t *v) { scf_handle_t *h = libscf_handle_create_bound_loop(); scf_instance_t *scf_inst = safe_scf_instance_create(h); scf_propertygroup_t *pg = safe_scf_pg_create(h); restarter_instance_state_t state, next_state; int r; assert(v->gv_type == GVT_INST); if (scf_inst == NULL) bad_error("safe_scf_instance_create", scf_error()); if (pg == NULL) bad_error("safe_scf_pg_create", scf_error()); /* if the vertex is already going offline, return */ rep_retry: if (scf_handle_decode_fmri(h, v->gv_name, NULL, NULL, scf_inst, NULL, NULL, SCF_DECODE_FMRI_EXACT) != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: libscf_handle_rebind(h); goto rep_retry; case SCF_ERROR_NOT_FOUND: scf_pg_destroy(pg); scf_instance_destroy(scf_inst); (void) scf_handle_unbind(h); scf_handle_destroy(h); return; } uu_die("Can't decode FMRI %s: %s\n", v->gv_name, scf_strerror(scf_error())); } r = scf_instance_get_pg(scf_inst, SCF_PG_RESTARTER, pg); if (r != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: libscf_handle_rebind(h); goto rep_retry; case SCF_ERROR_NOT_SET: case SCF_ERROR_NOT_FOUND: scf_pg_destroy(pg); scf_instance_destroy(scf_inst); (void) scf_handle_unbind(h); scf_handle_destroy(h); return; default: bad_error("scf_instance_get_pg", scf_error()); } } else { r = libscf_read_states(pg, &state, &next_state); if (r == 0 && (next_state == RESTARTER_STATE_OFFLINE || next_state == RESTARTER_STATE_DISABLED)) { log_framework(LOG_DEBUG, "%s: instance is already going down.\n", v->gv_name); scf_pg_destroy(pg); scf_instance_destroy(scf_inst); (void) scf_handle_unbind(h); scf_handle_destroy(h); return; } } scf_pg_destroy(pg); scf_instance_destroy(scf_inst); (void) stop_instance_fmri(h, v->gv_name, RSTOP_DEPENDENCY); (void) scf_handle_unbind(h); scf_handle_destroy(h); } /* * void graph_enable_by_vertex() * If admin is non-zero, this is an administrative request for change * of the enabled property. Thus, send the ADMIN_DISABLE rather than * a plain DISABLE restarter event. */ void graph_enable_by_vertex(graph_vertex_t *vertex, int enable, int admin) { graph_vertex_t *v; int r; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert((vertex->gv_flags & GV_CONFIGURED)); vertex->gv_flags = (vertex->gv_flags & ~GV_ENABLED) | (enable ? GV_ENABLED : 0); if (enable) { if (vertex->gv_state != RESTARTER_STATE_OFFLINE && vertex->gv_state != RESTARTER_STATE_DEGRADED && vertex->gv_state != RESTARTER_STATE_ONLINE) { /* * In case the vertex was notified to go down, * but now can return online, clear the _TOOFFLINE * and _TODISABLE flags. */ vertex->gv_flags &= ~GV_TOOFFLINE; vertex->gv_flags &= ~GV_TODISABLE; vertex_send_event(vertex, RESTARTER_EVENT_TYPE_ENABLE); } /* * Wait for state update from restarter before sending _START or * _STOP. */ return; } if (vertex->gv_state == RESTARTER_STATE_DISABLED) return; if (!admin) { vertex_send_event(vertex, RESTARTER_EVENT_TYPE_DISABLE); /* * Wait for state update from restarter before sending _START or * _STOP. */ return; } /* * If it is a DISABLE event requested by the administrator then we are * offlining the dependents first. */ /* * Set GV_TOOFFLINE for the services we are offlining. We cannot * clear the GV_TOOFFLINE bits from all the services because * other DISABLE events might be handled at the same time. */ vertex->gv_flags |= GV_TOOFFLINE; /* remember which vertex to disable... */ vertex->gv_flags |= GV_TODISABLE; /* set GV_TOOFFLINE for its dependents */ r = uu_list_walk(vertex->gv_dependents, (uu_walk_fn_t *)mark_subtree, NULL, 0); assert(r == 0); /* disable the instance now if there is nothing else to offline */ if (insubtree_dependents_down(vertex) == B_TRUE) { vertex_send_event(vertex, RESTARTER_EVENT_TYPE_ADMIN_DISABLE); return; } /* * This loop is similar to the one used for the graph reversal shutdown * and could be improved in term of performance for the subtree reversal * disable case. */ for (v = uu_list_first(dgraph); v != NULL; v = uu_list_next(dgraph, v)) { /* skip the vertex we are disabling for now */ if (v == vertex) continue; if (v->gv_type != GVT_INST || (v->gv_flags & GV_CONFIGURED) == 0 || (v->gv_flags & GV_ENABLED) == 0 || (v->gv_flags & GV_TOOFFLINE) == 0) continue; if ((v->gv_state != RESTARTER_STATE_ONLINE) && (v->gv_state != RESTARTER_STATE_DEGRADED)) { /* continue if there is nothing to offline */ continue; } /* * Instances which are up need to come down before we're * done, but we can only offline the leaves here. An * instance is a leaf when all its dependents are down. */ if (insubtree_dependents_down(v) == B_TRUE) offline_vertex(v); } } static int configure_vertex(graph_vertex_t *, scf_instance_t *); /* * Set the restarter for v to fmri_arg. That is, make sure a vertex for * fmri_arg exists, make v depend on it, and send _ADD_INSTANCE for v. If * v is already configured and fmri_arg indicates the current restarter, do * nothing. If v is configured and fmri_arg is a new restarter, delete v's * dependency on the restarter, send _REMOVE_INSTANCE for v, and set the new * restarter. Returns 0 on success, EINVAL if the FMRI is invalid, * ECONNABORTED if the repository connection is broken, and ELOOP * if the dependency would create a cycle. In the last case, *pathp will * point to a -1-terminated array of ids which compose the path from v to * restarter_fmri. */ int graph_change_restarter(graph_vertex_t *v, const char *fmri_arg, scf_handle_t *h, int **pathp) { char *restarter_fmri = NULL; graph_vertex_t *rv; int err; int id; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); if (fmri_arg[0] != '\0') { err = fmri_canonify(fmri_arg, &restarter_fmri, B_TRUE); if (err != 0) { assert(err == EINVAL); return (err); } } if (restarter_fmri == NULL || strcmp(restarter_fmri, SCF_SERVICE_STARTD) == 0) { if (v->gv_flags & GV_CONFIGURED) { if (v->gv_restarter_id == -1) { if (restarter_fmri != NULL) startd_free(restarter_fmri, max_scf_fmri_size); return (0); } graph_unset_restarter(v); } /* Master restarter, nothing to do. */ v->gv_restarter_id = -1; v->gv_restarter_channel = NULL; vertex_send_event(v, RESTARTER_EVENT_TYPE_ADD_INSTANCE); return (0); } if (v->gv_flags & GV_CONFIGURED) { id = dict_lookup_byname(restarter_fmri); if (id != -1 && v->gv_restarter_id == id) { startd_free(restarter_fmri, max_scf_fmri_size); return (0); } graph_unset_restarter(v); } err = graph_insert_vertex_unconfigured(restarter_fmri, GVT_INST, 0, RERR_NONE, &rv); startd_free(restarter_fmri, max_scf_fmri_size); assert(err == 0 || err == EEXIST); if (rv->gv_delegate_initialized == 0) { rv->gv_delegate_channel = restarter_protocol_init_delegate( rv->gv_name); rv->gv_delegate_initialized = 1; } v->gv_restarter_id = rv->gv_id; v->gv_restarter_channel = rv->gv_delegate_channel; err = graph_insert_dependency(v, rv, pathp); if (err != 0) { assert(err == ELOOP); return (ELOOP); } vertex_send_event(v, RESTARTER_EVENT_TYPE_ADD_INSTANCE); if (!(rv->gv_flags & GV_CONFIGURED)) { scf_instance_t *inst; err = libscf_fmri_get_instance(h, rv->gv_name, &inst); switch (err) { case 0: err = configure_vertex(rv, inst); scf_instance_destroy(inst); switch (err) { case 0: case ECANCELED: break; case ECONNABORTED: return (ECONNABORTED); default: bad_error("configure_vertex", err); } break; case ECONNABORTED: return (ECONNABORTED); case ENOENT: break; case ENOTSUP: /* * The fmri doesn't specify an instance - translate * to EINVAL. */ return (EINVAL); case EINVAL: default: bad_error("libscf_fmri_get_instance", err); } } return (0); } /* * Add all of the instances of the service named by fmri to the graph. * Returns * 0 - success * ENOENT - service indicated by fmri does not exist * * In both cases *reboundp will be B_TRUE if the handle was rebound, or B_FALSE * otherwise. */ static int add_service(const char *fmri, scf_handle_t *h, boolean_t *reboundp) { scf_service_t *svc; scf_instance_t *inst; scf_iter_t *iter; char *inst_fmri; int ret, r; *reboundp = B_FALSE; svc = safe_scf_service_create(h); inst = safe_scf_instance_create(h); iter = safe_scf_iter_create(h); inst_fmri = startd_alloc(max_scf_fmri_size); rebound: if (scf_handle_decode_fmri(h, fmri, NULL, svc, NULL, NULL, NULL, SCF_DECODE_FMRI_EXACT) != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: default: libscf_handle_rebind(h); *reboundp = B_TRUE; goto rebound; case SCF_ERROR_NOT_FOUND: ret = ENOENT; goto out; case SCF_ERROR_INVALID_ARGUMENT: case SCF_ERROR_CONSTRAINT_VIOLATED: case SCF_ERROR_NOT_BOUND: case SCF_ERROR_HANDLE_MISMATCH: bad_error("scf_handle_decode_fmri", scf_error()); } } if (scf_iter_service_instances(iter, svc) != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: default: libscf_handle_rebind(h); *reboundp = B_TRUE; goto rebound; case SCF_ERROR_DELETED: ret = ENOENT; goto out; case SCF_ERROR_HANDLE_MISMATCH: case SCF_ERROR_NOT_BOUND: case SCF_ERROR_NOT_SET: bad_error("scf_iter_service_instances", scf_error()); } } for (;;) { r = scf_iter_next_instance(iter, inst); if (r == 0) break; if (r != 1) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: default: libscf_handle_rebind(h); *reboundp = B_TRUE; goto rebound; case SCF_ERROR_DELETED: ret = ENOENT; goto out; case SCF_ERROR_HANDLE_MISMATCH: case SCF_ERROR_NOT_BOUND: case SCF_ERROR_NOT_SET: case SCF_ERROR_INVALID_ARGUMENT: bad_error("scf_iter_next_instance", scf_error()); } } if (scf_instance_to_fmri(inst, inst_fmri, max_scf_fmri_size) < 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: libscf_handle_rebind(h); *reboundp = B_TRUE; goto rebound; case SCF_ERROR_DELETED: continue; case SCF_ERROR_NOT_BOUND: case SCF_ERROR_NOT_SET: bad_error("scf_instance_to_fmri", scf_error()); } } r = dgraph_add_instance(inst_fmri, inst, B_FALSE); switch (r) { case 0: case ECANCELED: break; case EEXIST: continue; case ECONNABORTED: libscf_handle_rebind(h); *reboundp = B_TRUE; goto rebound; case EINVAL: default: bad_error("dgraph_add_instance", r); } } ret = 0; out: startd_free(inst_fmri, max_scf_fmri_size); scf_iter_destroy(iter); scf_instance_destroy(inst); scf_service_destroy(svc); return (ret); } struct depfmri_info { graph_vertex_t *v; /* GVT_GROUP vertex */ gv_type_t type; /* type of dependency */ const char *inst_fmri; /* FMRI of parental GVT_INST vert. */ const char *pg_name; /* Name of dependency pg */ scf_handle_t *h; int err; /* return error code */ int **pathp; /* return circular dependency path */ }; /* * Find or create a vertex for fmri and make info->v depend on it. * Returns * 0 - success * nonzero - failure * * On failure, sets info->err to * EINVAL - fmri is invalid * fmri does not match info->type * ELOOP - Adding the dependency creates a circular dependency. *info->pathp * will point to an array of the ids of the members of the cycle. * ECONNABORTED - repository connection was broken * ECONNRESET - succeeded, but repository connection was reset */ static int process_dependency_fmri(const char *fmri, struct depfmri_info *info) { int err; graph_vertex_t *depgroup_v, *v; char *fmri_copy, *cfmri; size_t fmri_copy_sz; const char *scope, *service, *instance, *pg; scf_instance_t *inst; boolean_t rebound; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); /* Get or create vertex for FMRI */ depgroup_v = info->v; if (strncmp(fmri, "file:", sizeof ("file:") - 1) == 0) { if (info->type != GVT_FILE) { log_framework(LOG_NOTICE, "FMRI \"%s\" is not allowed for the \"%s\" " "dependency's type of instance %s.\n", fmri, info->pg_name, info->inst_fmri); return (info->err = EINVAL); } err = graph_insert_vertex_unconfigured(fmri, info->type, 0, RERR_NONE, &v); switch (err) { case 0: break; case EEXIST: assert(v->gv_type == GVT_FILE); break; case EINVAL: /* prevented above */ default: bad_error("graph_insert_vertex_unconfigured", err); } } else { if (info->type != GVT_INST) { log_framework(LOG_NOTICE, "FMRI \"%s\" is not allowed for the \"%s\" " "dependency's type of instance %s.\n", fmri, info->pg_name, info->inst_fmri); return (info->err = EINVAL); } /* * We must canonify fmri & add a vertex for it. */ fmri_copy_sz = strlen(fmri) + 1; fmri_copy = startd_alloc(fmri_copy_sz); (void) strcpy(fmri_copy, fmri); /* Determine if the FMRI is a property group or instance */ if (scf_parse_svc_fmri(fmri_copy, &scope, &service, &instance, &pg, NULL) != 0) { startd_free(fmri_copy, fmri_copy_sz); log_framework(LOG_NOTICE, "Dependency \"%s\" of %s has invalid FMRI " "\"%s\".\n", info->pg_name, info->inst_fmri, fmri); return (info->err = EINVAL); } if (service == NULL || pg != NULL) { startd_free(fmri_copy, fmri_copy_sz); log_framework(LOG_NOTICE, "Dependency \"%s\" of %s does not designate a " "service or instance.\n", info->pg_name, info->inst_fmri); return (info->err = EINVAL); } if (scope == NULL || strcmp(scope, SCF_SCOPE_LOCAL) == 0) { cfmri = uu_msprintf("svc:/%s%s%s", service, instance ? ":" : "", instance ? instance : ""); } else { cfmri = uu_msprintf("svc://%s/%s%s%s", scope, service, instance ? ":" : "", instance ? instance : ""); } startd_free(fmri_copy, fmri_copy_sz); err = graph_insert_vertex_unconfigured(cfmri, instance ? GVT_INST : GVT_SVC, instance ? 0 : DEPGRP_REQUIRE_ANY, RERR_NONE, &v); uu_free(cfmri); switch (err) { case 0: break; case EEXIST: /* Verify v. */ if (instance != NULL) assert(v->gv_type == GVT_INST); else assert(v->gv_type == GVT_SVC); break; default: bad_error("graph_insert_vertex_unconfigured", err); } } /* Add dependency from depgroup_v to new vertex */ info->err = graph_insert_dependency(depgroup_v, v, info->pathp); switch (info->err) { case 0: break; case ELOOP: return (ELOOP); default: bad_error("graph_insert_dependency", info->err); } /* This must be after we insert the dependency, to avoid looping. */ switch (v->gv_type) { case GVT_INST: if ((v->gv_flags & GV_CONFIGURED) != 0) break; inst = safe_scf_instance_create(info->h); rebound = B_FALSE; rebound: err = libscf_lookup_instance(v->gv_name, inst); switch (err) { case 0: err = configure_vertex(v, inst); switch (err) { case 0: case ECANCELED: break; case ECONNABORTED: libscf_handle_rebind(info->h); rebound = B_TRUE; goto rebound; default: bad_error("configure_vertex", err); } break; case ENOENT: break; case ECONNABORTED: libscf_handle_rebind(info->h); rebound = B_TRUE; goto rebound; case EINVAL: case ENOTSUP: default: bad_error("libscf_fmri_get_instance", err); } scf_instance_destroy(inst); if (rebound) return (info->err = ECONNRESET); break; case GVT_SVC: (void) add_service(v->gv_name, info->h, &rebound); if (rebound) return (info->err = ECONNRESET); } return (0); } struct deppg_info { graph_vertex_t *v; /* GVT_INST vertex */ int err; /* return error */ int **pathp; /* return circular dependency path */ }; /* * Make info->v depend on a new GVT_GROUP node for this property group, * and then call process_dependency_fmri() for the values of the entity * property. Return 0 on success, or if something goes wrong return nonzero * and set info->err to ECONNABORTED, EINVAL, or the error code returned by * process_dependency_fmri(). */ static int process_dependency_pg(scf_propertygroup_t *pg, struct deppg_info *info) { scf_handle_t *h; depgroup_type_t deptype; restarter_error_t rerr; struct depfmri_info linfo; char *fmri, *pg_name; size_t fmri_sz; graph_vertex_t *depgrp; scf_property_t *prop; int err; int empty; scf_error_t scferr; ssize_t len; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); h = scf_pg_handle(pg); pg_name = startd_alloc(max_scf_name_size); len = scf_pg_get_name(pg, pg_name, max_scf_name_size); if (len < 0) { startd_free(pg_name, max_scf_name_size); switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: default: return (info->err = ECONNABORTED); case SCF_ERROR_DELETED: return (info->err = 0); case SCF_ERROR_NOT_SET: bad_error("scf_pg_get_name", scf_error()); } } /* * Skip over empty dependency groups. Since dependency property * groups are updated atomically, they are either empty or * fully populated. */ empty = depgroup_empty(h, pg); if (empty < 0) { log_error(LOG_INFO, "Error reading dependency group \"%s\" of %s: %s\n", pg_name, info->v->gv_name, scf_strerror(scf_error())); startd_free(pg_name, max_scf_name_size); return (info->err = EINVAL); } else if (empty == 1) { log_framework(LOG_DEBUG, "Ignoring empty dependency group \"%s\" of %s\n", pg_name, info->v->gv_name); startd_free(pg_name, max_scf_name_size); return (info->err = 0); } fmri_sz = strlen(info->v->gv_name) + 1 + len + 1; fmri = startd_alloc(fmri_sz); (void) snprintf(fmri, max_scf_name_size, "%s>%s", info->v->gv_name, pg_name); /* Validate the pg before modifying the graph */ deptype = depgroup_read_grouping(h, pg); if (deptype == DEPGRP_UNSUPPORTED) { log_error(LOG_INFO, "Dependency \"%s\" of %s has an unknown grouping value.\n", pg_name, info->v->gv_name); startd_free(fmri, fmri_sz); startd_free(pg_name, max_scf_name_size); return (info->err = EINVAL); } rerr = depgroup_read_restart(h, pg); if (rerr == RERR_UNSUPPORTED) { log_error(LOG_INFO, "Dependency \"%s\" of %s has an unknown restart_on value." "\n", pg_name, info->v->gv_name); startd_free(fmri, fmri_sz); startd_free(pg_name, max_scf_name_size); return (info->err = EINVAL); } prop = safe_scf_property_create(h); if (scf_pg_get_property(pg, SCF_PROPERTY_ENTITIES, prop) != 0) { scferr = scf_error(); scf_property_destroy(prop); if (scferr == SCF_ERROR_DELETED) { startd_free(fmri, fmri_sz); startd_free(pg_name, max_scf_name_size); return (info->err = 0); } else if (scferr != SCF_ERROR_NOT_FOUND) { startd_free(fmri, fmri_sz); startd_free(pg_name, max_scf_name_size); return (info->err = ECONNABORTED); } log_error(LOG_INFO, "Dependency \"%s\" of %s is missing a \"%s\" property.\n", pg_name, info->v->gv_name, SCF_PROPERTY_ENTITIES); startd_free(fmri, fmri_sz); startd_free(pg_name, max_scf_name_size); return (info->err = EINVAL); } /* Create depgroup vertex for pg */ err = graph_insert_vertex_unconfigured(fmri, GVT_GROUP, deptype, rerr, &depgrp); assert(err == 0); startd_free(fmri, fmri_sz); /* Add dependency from inst vertex to new vertex */ err = graph_insert_dependency(info->v, depgrp, info->pathp); /* ELOOP can't happen because this should be a new vertex */ assert(err == 0); linfo.v = depgrp; linfo.type = depgroup_read_scheme(h, pg); linfo.inst_fmri = info->v->gv_name; linfo.pg_name = pg_name; linfo.h = h; linfo.err = 0; linfo.pathp = info->pathp; err = walk_property_astrings(prop, (callback_t)process_dependency_fmri, &linfo); scf_property_destroy(prop); startd_free(pg_name, max_scf_name_size); switch (err) { case 0: case EINTR: return (info->err = linfo.err); case ECONNABORTED: case EINVAL: return (info->err = err); case ECANCELED: return (info->err = 0); case ECONNRESET: return (info->err = ECONNABORTED); default: bad_error("walk_property_astrings", err); /* NOTREACHED */ } } /* * Build the dependency info for v from the repository. Returns 0 on success, * ECONNABORTED on repository disconnection, EINVAL if the repository * configuration is invalid, and ELOOP if a dependency would cause a cycle. * In the last case, *pathp will point to a -1-terminated array of ids which * constitute the rest of the dependency cycle. */ static int set_dependencies(graph_vertex_t *v, scf_instance_t *inst, int **pathp) { struct deppg_info info; int err; uint_t old_configured; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); /* * Mark the vertex as configured during dependency insertion to avoid * dependency cycles (which can appear in the graph if one of the * vertices is an exclusion-group). */ old_configured = v->gv_flags & GV_CONFIGURED; v->gv_flags |= GV_CONFIGURED; info.err = 0; info.v = v; info.pathp = pathp; err = walk_dependency_pgs(inst, (callback_t)process_dependency_pg, &info); if (!old_configured) v->gv_flags &= ~GV_CONFIGURED; switch (err) { case 0: case EINTR: return (info.err); case ECONNABORTED: return (ECONNABORTED); case ECANCELED: /* Should get delete event, so return 0. */ return (0); default: bad_error("walk_dependency_pgs", err); /* NOTREACHED */ } } static void handle_cycle(const char *fmri, int *path) { const char *cp; size_t sz; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); path_to_str(path, (char **)&cp, &sz); log_error(LOG_ERR, "Transitioning %s to maintenance " "because it completes a dependency cycle (see svcs -xv for " "details):\n%s", fmri ? fmri : "?", cp); startd_free((void *)cp, sz); } /* * Increment the vertex's reference count to prevent the vertex removal * from the dgraph. */ static void vertex_ref(graph_vertex_t *v) { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); v->gv_refs++; } /* * Decrement the vertex's reference count and remove the vertex from * the dgraph when possible. * * Return VERTEX_REMOVED when the vertex has been removed otherwise * return VERTEX_INUSE. */ static int vertex_unref(graph_vertex_t *v) { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert(v->gv_refs > 0); v->gv_refs--; return (free_if_unrefed(v)); } /* * When run on the dependencies of a vertex, populates list with * graph_edge_t's which point to the service vertices or the instance * vertices (no GVT_GROUP nodes) on which the vertex depends. * * Increment the vertex's reference count once the vertex is inserted * in the list. The vertex won't be able to be deleted from the dgraph * while it is referenced. */ static int append_svcs_or_insts(graph_edge_t *e, uu_list_t *list) { graph_vertex_t *v = e->ge_vertex; graph_edge_t *new; int r; switch (v->gv_type) { case GVT_INST: case GVT_SVC: break; case GVT_GROUP: r = uu_list_walk(v->gv_dependencies, (uu_walk_fn_t *)append_svcs_or_insts, list, 0); assert(r == 0); return (UU_WALK_NEXT); case GVT_FILE: return (UU_WALK_NEXT); default: #ifndef NDEBUG uu_warn("%s:%d: Unexpected vertex type %d.\n", __FILE__, __LINE__, v->gv_type); #endif abort(); } new = startd_alloc(sizeof (*new)); new->ge_vertex = v; uu_list_node_init(new, &new->ge_link, graph_edge_pool); r = uu_list_insert_before(list, NULL, new); assert(r == 0); /* * Because we are inserting the vertex in a list, we don't want * the vertex to be freed while the list is in use. In order to * achieve that, increment the vertex's reference count. */ vertex_ref(v); return (UU_WALK_NEXT); } static boolean_t should_be_in_subgraph(graph_vertex_t *v) { graph_edge_t *e; if (v == milestone) return (B_TRUE); /* * v is in the subgraph if any of its dependents are in the subgraph. * Except for EXCLUDE_ALL dependents. And OPTIONAL dependents only * count if we're enabled. */ for (e = uu_list_first(v->gv_dependents); e != NULL; e = uu_list_next(v->gv_dependents, e)) { graph_vertex_t *dv = e->ge_vertex; if (!(dv->gv_flags & GV_INSUBGRAPH)) continue; /* * Don't include instances that are optional and disabled. */ if (v->gv_type == GVT_INST && dv->gv_type == GVT_SVC) { int in = 0; graph_edge_t *ee; for (ee = uu_list_first(dv->gv_dependents); ee != NULL; ee = uu_list_next(dv->gv_dependents, ee)) { graph_vertex_t *ddv = e->ge_vertex; if (ddv->gv_type == GVT_GROUP && ddv->gv_depgroup == DEPGRP_EXCLUDE_ALL) continue; if (ddv->gv_type == GVT_GROUP && ddv->gv_depgroup == DEPGRP_OPTIONAL_ALL && !(v->gv_flags & GV_ENBLD_NOOVR)) continue; in = 1; } if (!in) continue; } if (v->gv_type == GVT_INST && dv->gv_type == GVT_GROUP && dv->gv_depgroup == DEPGRP_OPTIONAL_ALL && !(v->gv_flags & GV_ENBLD_NOOVR)) continue; /* Don't include excluded services and instances */ if (dv->gv_type == GVT_GROUP && dv->gv_depgroup == DEPGRP_EXCLUDE_ALL) continue; return (B_TRUE); } return (B_FALSE); } /* * Ensures that GV_INSUBGRAPH is set properly for v and its descendents. If * any bits change, manipulate the repository appropriately. Returns 0 or * ECONNABORTED. */ static int eval_subgraph(graph_vertex_t *v, scf_handle_t *h) { boolean_t old = (v->gv_flags & GV_INSUBGRAPH) != 0; boolean_t new; graph_edge_t *e; scf_instance_t *inst; int ret = 0, r; assert(milestone != NULL && milestone != MILESTONE_NONE); new = should_be_in_subgraph(v); if (new == old) return (0); log_framework(LOG_DEBUG, new ? "Adding %s to the subgraph.\n" : "Removing %s from the subgraph.\n", v->gv_name); v->gv_flags = (v->gv_flags & ~GV_INSUBGRAPH) | (new ? GV_INSUBGRAPH : 0); if (v->gv_type == GVT_INST && (v->gv_flags & GV_CONFIGURED)) { int err; get_inst: err = libscf_fmri_get_instance(h, v->gv_name, &inst); if (err != 0) { switch (err) { case ECONNABORTED: libscf_handle_rebind(h); ret = ECONNABORTED; goto get_inst; case ENOENT: break; case EINVAL: case ENOTSUP: default: bad_error("libscf_fmri_get_instance", err); } } else { const char *f; if (new) { err = libscf_delete_enable_ovr(inst); f = "libscf_delete_enable_ovr"; } else { err = libscf_set_enable_ovr(inst, 0); f = "libscf_set_enable_ovr"; } scf_instance_destroy(inst); switch (err) { case 0: case ECANCELED: break; case ECONNABORTED: libscf_handle_rebind(h); /* * We must continue so the graph is updated, * but we must return ECONNABORTED so any * libscf state held by any callers is reset. */ ret = ECONNABORTED; goto get_inst; case EROFS: case EPERM: log_error(LOG_WARNING, "Could not set %s/%s for %s: %s.\n", SCF_PG_GENERAL_OVR, SCF_PROPERTY_ENABLED, v->gv_name, strerror(err)); break; default: bad_error(f, err); } } } for (e = uu_list_first(v->gv_dependencies); e != NULL; e = uu_list_next(v->gv_dependencies, e)) { r = eval_subgraph(e->ge_vertex, h); if (r != 0) { assert(r == ECONNABORTED); ret = ECONNABORTED; } } return (ret); } /* * Delete the (property group) dependencies of v & create new ones based on * inst. If doing so would create a cycle, log a message and put the instance * into maintenance. Update GV_INSUBGRAPH flags as necessary. Returns 0 or * ECONNABORTED. */ int refresh_vertex(graph_vertex_t *v, scf_instance_t *inst) { int err; int *path; char *fmri; int r; scf_handle_t *h = scf_instance_handle(inst); uu_list_t *old_deps; int ret = 0; graph_edge_t *e; graph_vertex_t *vv; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert(v->gv_type == GVT_INST); log_framework(LOG_DEBUG, "Graph engine: Refreshing %s.\n", v->gv_name); if (milestone > MILESTONE_NONE) { /* * In case some of v's dependencies are being deleted we must * make a list of them now for GV_INSUBGRAPH-flag evaluation * after the new dependencies are in place. */ old_deps = startd_list_create(graph_edge_pool, NULL, 0); err = uu_list_walk(v->gv_dependencies, (uu_walk_fn_t *)append_svcs_or_insts, old_deps, 0); assert(err == 0); } delete_instance_dependencies(v, B_FALSE); err = set_dependencies(v, inst, &path); switch (err) { case 0: break; case ECONNABORTED: ret = err; goto out; case EINVAL: case ELOOP: r = libscf_instance_get_fmri(inst, &fmri); switch (r) { case 0: break; case ECONNABORTED: ret = ECONNABORTED; goto out; case ECANCELED: ret = 0; goto out; default: bad_error("libscf_instance_get_fmri", r); } if (err == EINVAL) { log_error(LOG_ERR, "Transitioning %s " "to maintenance due to misconfiguration.\n", fmri ? fmri : "?"); vertex_send_event(v, RESTARTER_EVENT_TYPE_INVALID_DEPENDENCY); } else { handle_cycle(fmri, path); vertex_send_event(v, RESTARTER_EVENT_TYPE_DEPENDENCY_CYCLE); } startd_free(fmri, max_scf_fmri_size); ret = 0; goto out; default: bad_error("set_dependencies", err); } if (milestone > MILESTONE_NONE) { boolean_t aborted = B_FALSE; for (e = uu_list_first(old_deps); e != NULL; e = uu_list_next(old_deps, e)) { vv = e->ge_vertex; if (vertex_unref(vv) == VERTEX_INUSE && eval_subgraph(vv, h) == ECONNABORTED) aborted = B_TRUE; } for (e = uu_list_first(v->gv_dependencies); e != NULL; e = uu_list_next(v->gv_dependencies, e)) { if (eval_subgraph(e->ge_vertex, h) == ECONNABORTED) aborted = B_TRUE; } if (aborted) { ret = ECONNABORTED; goto out; } } graph_start_if_satisfied(v); ret = 0; out: if (milestone > MILESTONE_NONE) { void *cookie = NULL; while ((e = uu_list_teardown(old_deps, &cookie)) != NULL) startd_free(e, sizeof (*e)); uu_list_destroy(old_deps); } return (ret); } /* * Set up v according to inst. That is, make sure it depends on its * restarter and set up its dependencies. Send the ADD_INSTANCE command to * the restarter, and send ENABLE or DISABLE as appropriate. * * Returns 0 on success, ECONNABORTED on repository disconnection, or * ECANCELED if inst is deleted. */ static int configure_vertex(graph_vertex_t *v, scf_instance_t *inst) { scf_handle_t *h; scf_propertygroup_t *pg; scf_snapshot_t *snap; char *restarter_fmri = startd_alloc(max_scf_value_size); int enabled, enabled_ovr; int err; int *path; int deathrow; restarter_fmri[0] = '\0'; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert(v->gv_type == GVT_INST); assert((v->gv_flags & GV_CONFIGURED) == 0); /* GV_INSUBGRAPH should already be set properly. */ assert(should_be_in_subgraph(v) == ((v->gv_flags & GV_INSUBGRAPH) != 0)); /* * If the instance fmri is in the deathrow list then set the * GV_DEATHROW flag on the vertex and create and set to true the * SCF_PROPERTY_DEATHROW boolean property in the non-persistent * repository for this instance fmri. */ if ((v->gv_flags & GV_DEATHROW) || (is_fmri_in_deathrow(v->gv_name) == B_TRUE)) { if ((v->gv_flags & GV_DEATHROW) == 0) { /* * Set flag GV_DEATHROW, create and set to true * the SCF_PROPERTY_DEATHROW property in the * non-persistent repository for this instance fmri. */ v->gv_flags |= GV_DEATHROW; switch (err = libscf_set_deathrow(inst, 1)) { case 0: break; case ECONNABORTED: case ECANCELED: startd_free(restarter_fmri, max_scf_value_size); return (err); case EROFS: log_error(LOG_WARNING, "Could not set %s/%s " "for deathrow %s: %s.\n", SCF_PG_DEATHROW, SCF_PROPERTY_DEATHROW, v->gv_name, strerror(err)); break; case EPERM: uu_die("Permission denied.\n"); /* NOTREACHED */ default: bad_error("libscf_set_deathrow", err); } log_framework(LOG_DEBUG, "Deathrow, graph set %s.\n", v->gv_name); } startd_free(restarter_fmri, max_scf_value_size); return (0); } h = scf_instance_handle(inst); /* * Using a temporary deathrow boolean property, set through * libscf_set_deathrow(), only for fmris on deathrow, is necessary * because deathrow_fini() may already have been called, and in case * of a refresh, GV_DEATHROW may need to be set again. * libscf_get_deathrow() sets deathrow to 1 only if this instance * has a temporary boolean property named 'deathrow' valued true * in a property group 'deathrow', -1 or 0 in all other cases. */ err = libscf_get_deathrow(h, inst, &deathrow); switch (err) { case 0: break; case ECONNABORTED: case ECANCELED: startd_free(restarter_fmri, max_scf_value_size); return (err); default: bad_error("libscf_get_deathrow", err); } if (deathrow == 1) { v->gv_flags |= GV_DEATHROW; startd_free(restarter_fmri, max_scf_value_size); return (0); } log_framework(LOG_DEBUG, "Graph adding %s.\n", v->gv_name); /* * If the instance does not have a restarter property group, * initialize its state to uninitialized/none, in case the restarter * is not enabled. */ pg = safe_scf_pg_create(h); if (scf_instance_get_pg(inst, SCF_PG_RESTARTER, pg) != 0) { instance_data_t idata; uint_t count = 0, msecs = ALLOC_DELAY; switch (scf_error()) { case SCF_ERROR_NOT_FOUND: break; case SCF_ERROR_CONNECTION_BROKEN: default: scf_pg_destroy(pg); return (ECONNABORTED); case SCF_ERROR_DELETED: scf_pg_destroy(pg); return (ECANCELED); case SCF_ERROR_NOT_SET: bad_error("scf_instance_get_pg", scf_error()); } switch (err = libscf_instance_get_fmri(inst, (char **)&idata.i_fmri)) { case 0: break; case ECONNABORTED: case ECANCELED: scf_pg_destroy(pg); return (err); default: bad_error("libscf_instance_get_fmri", err); } idata.i_state = RESTARTER_STATE_NONE; idata.i_next_state = RESTARTER_STATE_NONE; init_state: switch (err = _restarter_commit_states(h, &idata, RESTARTER_STATE_UNINIT, RESTARTER_STATE_NONE, NULL)) { case 0: break; case ENOMEM: ++count; if (count < ALLOC_RETRY) { (void) poll(NULL, 0, msecs); msecs *= ALLOC_DELAY_MULT; goto init_state; } uu_die("Insufficient memory.\n"); /* NOTREACHED */ case ECONNABORTED: startd_free((void *)idata.i_fmri, max_scf_fmri_size); scf_pg_destroy(pg); return (ECONNABORTED); case ENOENT: startd_free((void *)idata.i_fmri, max_scf_fmri_size); scf_pg_destroy(pg); return (ECANCELED); case EPERM: case EACCES: case EROFS: log_error(LOG_NOTICE, "Could not initialize state for " "%s: %s.\n", idata.i_fmri, strerror(err)); break; case EINVAL: default: bad_error("_restarter_commit_states", err); } startd_free((void *)idata.i_fmri, max_scf_fmri_size); } scf_pg_destroy(pg); if (milestone != NULL) { /* * Make sure the enable-override is set properly before we * read whether we should be enabled. */ if (milestone == MILESTONE_NONE || !(v->gv_flags & GV_INSUBGRAPH)) { /* * This might seem unjustified after the milestone * transition has completed (non_subgraph_svcs == 0), * but it's important because when we boot to * a milestone, we set the milestone before populating * the graph, and all of the new non-subgraph services * need to be disabled here. */ switch (err = libscf_set_enable_ovr(inst, 0)) { case 0: break; case ECONNABORTED: case ECANCELED: return (err); case EROFS: log_error(LOG_WARNING, "Could not set %s/%s for %s: %s.\n", SCF_PG_GENERAL_OVR, SCF_PROPERTY_ENABLED, v->gv_name, strerror(err)); break; case EPERM: uu_die("Permission denied.\n"); /* NOTREACHED */ default: bad_error("libscf_set_enable_ovr", err); } } else { assert(v->gv_flags & GV_INSUBGRAPH); switch (err = libscf_delete_enable_ovr(inst)) { case 0: break; case ECONNABORTED: case ECANCELED: return (err); case EPERM: uu_die("Permission denied.\n"); /* NOTREACHED */ default: bad_error("libscf_delete_enable_ovr", err); } } } err = libscf_get_basic_instance_data(h, inst, v->gv_name, &enabled, &enabled_ovr, &restarter_fmri); switch (err) { case 0: break; case ECONNABORTED: case ECANCELED: startd_free(restarter_fmri, max_scf_value_size); return (err); case ENOENT: log_framework(LOG_DEBUG, "Ignoring %s because it has no general property group.\n", v->gv_name); startd_free(restarter_fmri, max_scf_value_size); return (0); default: bad_error("libscf_get_basic_instance_data", err); } if (enabled == -1) { startd_free(restarter_fmri, max_scf_value_size); return (0); } v->gv_flags = (v->gv_flags & ~GV_ENBLD_NOOVR) | (enabled ? GV_ENBLD_NOOVR : 0); if (enabled_ovr != -1) enabled = enabled_ovr; v->gv_state = RESTARTER_STATE_UNINIT; snap = libscf_get_or_make_running_snapshot(inst, v->gv_name, B_TRUE); scf_snapshot_destroy(snap); /* Set up the restarter. (Sends _ADD_INSTANCE on success.) */ err = graph_change_restarter(v, restarter_fmri, h, &path); if (err != 0) { instance_data_t idata; uint_t count = 0, msecs = ALLOC_DELAY; const char *reason; if (err == ECONNABORTED) { startd_free(restarter_fmri, max_scf_value_size); return (err); } assert(err == EINVAL || err == ELOOP); if (err == EINVAL) { log_framework(LOG_ERR, emsg_invalid_restarter, v->gv_name); reason = "invalid_restarter"; } else { handle_cycle(v->gv_name, path); reason = "dependency_cycle"; } startd_free(restarter_fmri, max_scf_value_size); /* * We didn't register the instance with the restarter, so we * must set maintenance mode ourselves. */ err = libscf_instance_get_fmri(inst, (char **)&idata.i_fmri); if (err != 0) { assert(err == ECONNABORTED || err == ECANCELED); return (err); } idata.i_state = RESTARTER_STATE_NONE; idata.i_next_state = RESTARTER_STATE_NONE; set_maint: switch (err = _restarter_commit_states(h, &idata, RESTARTER_STATE_MAINT, RESTARTER_STATE_NONE, reason)) { case 0: break; case ENOMEM: ++count; if (count < ALLOC_RETRY) { (void) poll(NULL, 0, msecs); msecs *= ALLOC_DELAY_MULT; goto set_maint; } uu_die("Insufficient memory.\n"); /* NOTREACHED */ case ECONNABORTED: startd_free((void *)idata.i_fmri, max_scf_fmri_size); return (ECONNABORTED); case ENOENT: startd_free((void *)idata.i_fmri, max_scf_fmri_size); return (ECANCELED); case EPERM: case EACCES: case EROFS: log_error(LOG_NOTICE, "Could not initialize state for " "%s: %s.\n", idata.i_fmri, strerror(err)); break; case EINVAL: default: bad_error("_restarter_commit_states", err); } startd_free((void *)idata.i_fmri, max_scf_fmri_size); v->gv_state = RESTARTER_STATE_MAINT; goto out; } startd_free(restarter_fmri, max_scf_value_size); /* Add all the other dependencies. */ err = refresh_vertex(v, inst); if (err != 0) { assert(err == ECONNABORTED); return (err); } out: v->gv_flags |= GV_CONFIGURED; graph_enable_by_vertex(v, enabled, 0); return (0); } static void do_uadmin(void) { int fd, left; struct statvfs vfs; const char * const resetting = "/etc/svc/volatile/resetting"; fd = creat(resetting, 0777); if (fd >= 0) startd_close(fd); else uu_warn("Could not create \"%s\"", resetting); /* Kill dhcpagent if we're not using nfs for root */ if ((statvfs("/", &vfs) == 0) && (strncmp(vfs.f_basetype, "nfs", sizeof ("nfs") - 1) != 0)) (void) system("/usr/bin/pkill -x -u 0 dhcpagent"); (void) system("/usr/sbin/killall"); left = 5; while (left > 0) left = sleep(left); (void) system("/usr/sbin/killall 9"); left = 10; while (left > 0) left = sleep(left); sync(); sync(); sync(); (void) system("/sbin/umountall -l"); (void) system("/sbin/umount /tmp >/dev/null 2>&1"); (void) system("/sbin/umount /var/adm >/dev/null 2>&1"); (void) system("/sbin/umount /var/run >/dev/null 2>&1"); (void) system("/sbin/umount /var >/dev/null 2>&1"); (void) system("/sbin/umount /usr >/dev/null 2>&1"); uu_warn("The system is down.\n"); (void) uadmin(A_SHUTDOWN, halting, NULL); uu_warn("uadmin() failed"); if (remove(resetting) != 0 && errno != ENOENT) uu_warn("Could not remove \"%s\"", resetting); } /* * If any of the up_svcs[] are online or satisfiable, return true. If they are * all missing, disabled, in maintenance, or unsatisfiable, return false. */ boolean_t can_come_up(void) { int i; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); /* * If we are booting to single user (boot -s), * SCF_MILESTONE_SINGLE_USER is needed to come up because startd * spawns sulogin after single-user is online (see specials.c). */ i = (booting_to_single_user ? 0 : 1); for (; up_svcs[i] != NULL; ++i) { if (up_svcs_p[i] == NULL) { up_svcs_p[i] = vertex_get_by_name(up_svcs[i]); if (up_svcs_p[i] == NULL) continue; } /* * Ignore unconfigured services (the ones that have been * mentioned in a dependency from other services, but do * not exist in the repository). Services which exist * in the repository but don't have general/enabled * property will be also ignored. */ if (!(up_svcs_p[i]->gv_flags & GV_CONFIGURED)) continue; switch (up_svcs_p[i]->gv_state) { case RESTARTER_STATE_ONLINE: case RESTARTER_STATE_DEGRADED: /* * Deactivate verbose boot once a login service has been * reached. */ st->st_log_login_reached = 1; /*FALLTHROUGH*/ case RESTARTER_STATE_UNINIT: return (B_TRUE); case RESTARTER_STATE_OFFLINE: if (instance_satisfied(up_svcs_p[i], B_TRUE) != -1) return (B_TRUE); log_framework(LOG_DEBUG, "can_come_up(): %s is unsatisfiable.\n", up_svcs_p[i]->gv_name); continue; case RESTARTER_STATE_DISABLED: case RESTARTER_STATE_MAINT: log_framework(LOG_DEBUG, "can_come_up(): %s is in state %s.\n", up_svcs_p[i]->gv_name, instance_state_str[up_svcs_p[i]->gv_state]); continue; default: #ifndef NDEBUG uu_warn("%s:%d: Unexpected vertex state %d.\n", __FILE__, __LINE__, up_svcs_p[i]->gv_state); #endif abort(); } } /* * In the seed repository, console-login is unsatisfiable because * services are missing. To behave correctly in that case we don't want * to return false until manifest-import is online. */ if (manifest_import_p == NULL) { manifest_import_p = vertex_get_by_name(manifest_import); if (manifest_import_p == NULL) return (B_FALSE); } switch (manifest_import_p->gv_state) { case RESTARTER_STATE_ONLINE: case RESTARTER_STATE_DEGRADED: case RESTARTER_STATE_DISABLED: case RESTARTER_STATE_MAINT: break; case RESTARTER_STATE_OFFLINE: if (instance_satisfied(manifest_import_p, B_TRUE) == -1) break; /* FALLTHROUGH */ case RESTARTER_STATE_UNINIT: return (B_TRUE); } return (B_FALSE); } /* * Runs sulogin. Returns * 0 - success * EALREADY - sulogin is already running * EBUSY - console-login is running */ static int run_sulogin(const char *msg) { graph_vertex_t *v; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); if (sulogin_running) return (EALREADY); v = vertex_get_by_name(console_login_fmri); if (v != NULL && inst_running(v)) return (EBUSY); sulogin_running = B_TRUE; MUTEX_UNLOCK(&dgraph_lock); fork_sulogin(B_FALSE, msg); MUTEX_LOCK(&dgraph_lock); sulogin_running = B_FALSE; if (console_login_ready) { v = vertex_get_by_name(console_login_fmri); if (v != NULL && v->gv_state == RESTARTER_STATE_OFFLINE && !inst_running(v)) { if (v->gv_start_f == NULL) vertex_send_event(v, RESTARTER_EVENT_TYPE_START); else v->gv_start_f(v); } console_login_ready = B_FALSE; } return (0); } /* * The sulogin thread runs sulogin while can_come_up() is false. run_sulogin() * keeps sulogin from stepping on console-login's toes. */ /* ARGSUSED */ static void * sulogin_thread(void *unused) { MUTEX_LOCK(&dgraph_lock); assert(sulogin_thread_running); do { (void) run_sulogin("Console login service(s) cannot run\n"); } while (!can_come_up()); sulogin_thread_running = B_FALSE; MUTEX_UNLOCK(&dgraph_lock); return (NULL); } /* ARGSUSED */ void * single_user_thread(void *unused) { uint_t left; scf_handle_t *h; scf_instance_t *inst; scf_property_t *prop; scf_value_t *val; const char *msg; char *buf; int r; MUTEX_LOCK(&single_user_thread_lock); single_user_thread_count++; if (!booting_to_single_user) { /* * From rcS.sh: Look for ttymon, in.telnetd, in.rlogind and * processes in their process groups so they can be terminated. */ (void) fputs("svc.startd: Killing user processes: ", stdout); (void) system("/usr/sbin/killall"); (void) system("/usr/sbin/killall 9"); (void) system("/usr/bin/pkill -TERM -v -u 0,1"); left = 5; while (left > 0) left = sleep(left); (void) system("/usr/bin/pkill -KILL -v -u 0,1"); (void) puts("done."); } if (go_single_user_mode || booting_to_single_user) { msg = "SINGLE USER MODE\n"; } else { assert(go_to_level1); fork_rc_script('1', "start", B_TRUE); uu_warn("The system is ready for administration.\n"); msg = ""; } MUTEX_UNLOCK(&single_user_thread_lock); for (;;) { MUTEX_LOCK(&dgraph_lock); r = run_sulogin(msg); MUTEX_UNLOCK(&dgraph_lock); if (r == 0) break; assert(r == EALREADY || r == EBUSY); left = 3; while (left > 0) left = sleep(left); } MUTEX_LOCK(&single_user_thread_lock); /* * If another single user thread has started, let it finish changing * the run level. */ if (single_user_thread_count > 1) { single_user_thread_count--; MUTEX_UNLOCK(&single_user_thread_lock); return (NULL); } h = libscf_handle_create_bound_loop(); inst = scf_instance_create(h); prop = safe_scf_property_create(h); val = safe_scf_value_create(h); buf = startd_alloc(max_scf_fmri_size); lookup: if (scf_handle_decode_fmri(h, SCF_SERVICE_STARTD, NULL, NULL, inst, NULL, NULL, SCF_DECODE_FMRI_EXACT) != 0) { switch (scf_error()) { case SCF_ERROR_NOT_FOUND: r = libscf_create_self(h); if (r == 0) goto lookup; assert(r == ECONNABORTED); /* FALLTHROUGH */ case SCF_ERROR_CONNECTION_BROKEN: libscf_handle_rebind(h); goto lookup; case SCF_ERROR_INVALID_ARGUMENT: case SCF_ERROR_CONSTRAINT_VIOLATED: case SCF_ERROR_NOT_BOUND: case SCF_ERROR_HANDLE_MISMATCH: default: bad_error("scf_handle_decode_fmri", scf_error()); } } MUTEX_LOCK(&dgraph_lock); r = libscf_inst_delete_prop(inst, SCF_PG_OPTIONS_OVR, SCF_PROPERTY_MILESTONE); switch (r) { case 0: case ECANCELED: break; case ECONNABORTED: MUTEX_UNLOCK(&dgraph_lock); libscf_handle_rebind(h); goto lookup; case EPERM: case EACCES: case EROFS: log_error(LOG_WARNING, "Could not clear temporary milestone: " "%s.\n", strerror(r)); break; default: bad_error("libscf_inst_delete_prop", r); } MUTEX_UNLOCK(&dgraph_lock); r = libscf_get_milestone(inst, prop, val, buf, max_scf_fmri_size); switch (r) { case ECANCELED: case ENOENT: case EINVAL: (void) strcpy(buf, "all"); /* FALLTHROUGH */ case 0: uu_warn("Returning to milestone %s.\n", buf); break; case ECONNABORTED: libscf_handle_rebind(h); goto lookup; default: bad_error("libscf_get_milestone", r); } r = dgraph_set_milestone(buf, h, B_FALSE); switch (r) { case 0: case ECONNRESET: case EALREADY: case EINVAL: case ENOENT: break; default: bad_error("dgraph_set_milestone", r); } /* * See graph_runlevel_changed(). */ MUTEX_LOCK(&dgraph_lock); utmpx_set_runlevel(target_milestone_as_runlevel(), 'S', B_TRUE); MUTEX_UNLOCK(&dgraph_lock); startd_free(buf, max_scf_fmri_size); scf_value_destroy(val); scf_property_destroy(prop); scf_instance_destroy(inst); scf_handle_destroy(h); /* * We'll give ourselves 3 seconds to respond to all of the enablings * that setting the milestone should have created before checking * whether to run sulogin. */ left = 3; while (left > 0) left = sleep(left); MUTEX_LOCK(&dgraph_lock); /* * Clearing these variables will allow the sulogin thread to run. We * check here in case there aren't any more state updates anytime soon. */ go_to_level1 = go_single_user_mode = booting_to_single_user = B_FALSE; if (!sulogin_thread_running && !can_come_up()) { (void) startd_thread_create(sulogin_thread, NULL); sulogin_thread_running = B_TRUE; } MUTEX_UNLOCK(&dgraph_lock); single_user_thread_count--; MUTEX_UNLOCK(&single_user_thread_lock); return (NULL); } /* * Dependency graph operations API. These are handle-independent thread-safe * graph manipulation functions which are the entry points for the event * threads below. */ /* * If a configured vertex exists for inst_fmri, return EEXIST. If no vertex * exists for inst_fmri, add one. Then fetch the restarter from inst, make * this vertex dependent on it, and send _ADD_INSTANCE to the restarter. * Fetch whether the instance should be enabled from inst and send _ENABLE or * _DISABLE as appropriate. Finally rummage through inst's dependency * property groups and add vertices and edges as appropriate. If anything * goes wrong after sending _ADD_INSTANCE, send _ADMIN_MAINT_ON to put the * instance in maintenance. Don't send _START or _STOP until we get a state * update in case we're being restarted and the service is already running. * * To support booting to a milestone, we must also make sure all dependencies * encountered are configured, if they exist in the repository. * * Returns 0 on success, ECONNABORTED on repository disconnection, EINVAL if * inst_fmri is an invalid (or not canonical) FMRI, ECANCELED if inst is * deleted, or EEXIST if a configured vertex for inst_fmri already exists. */ int dgraph_add_instance(const char *inst_fmri, scf_instance_t *inst, boolean_t lock_graph) { graph_vertex_t *v; int err; if (strcmp(inst_fmri, SCF_SERVICE_STARTD) == 0) return (0); /* Check for a vertex for inst_fmri. */ if (lock_graph) { MUTEX_LOCK(&dgraph_lock); } else { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); } v = vertex_get_by_name(inst_fmri); if (v != NULL) { assert(v->gv_type == GVT_INST); if (v->gv_flags & GV_CONFIGURED) { if (lock_graph) MUTEX_UNLOCK(&dgraph_lock); return (EEXIST); } } else { /* Add the vertex. */ err = graph_insert_vertex_unconfigured(inst_fmri, GVT_INST, 0, RERR_NONE, &v); if (err != 0) { assert(err == EINVAL); if (lock_graph) MUTEX_UNLOCK(&dgraph_lock); return (EINVAL); } } err = configure_vertex(v, inst); if (lock_graph) MUTEX_UNLOCK(&dgraph_lock); return (err); } /* * Locate the vertex for this property group's instance. If it doesn't exist * or is unconfigured, call dgraph_add_instance() & return. Otherwise fetch * the restarter for the instance, and if it has changed, send * _REMOVE_INSTANCE to the old restarter, remove the dependency, make sure the * new restarter has a vertex, add a new dependency, and send _ADD_INSTANCE to * the new restarter. Then fetch whether the instance should be enabled, and * if it is different from what we had, or if we changed the restarter, send * the appropriate _ENABLE or _DISABLE command. * * Returns 0 on success, ENOTSUP if the pg's parent is not an instance, * ECONNABORTED on repository disconnection, ECANCELED if the instance is * deleted, or -1 if the instance's general property group is deleted or if * its enabled property is misconfigured. */ static int dgraph_update_general(scf_propertygroup_t *pg) { scf_handle_t *h; scf_instance_t *inst; char *fmri; char *restarter_fmri; graph_vertex_t *v; int err; int enabled, enabled_ovr; int oldflags; /* Find the vertex for this service */ h = scf_pg_handle(pg); inst = safe_scf_instance_create(h); if (scf_pg_get_parent_instance(pg, inst) != 0) { switch (scf_error()) { case SCF_ERROR_CONSTRAINT_VIOLATED: return (ENOTSUP); case SCF_ERROR_CONNECTION_BROKEN: default: return (ECONNABORTED); case SCF_ERROR_DELETED: return (0); case SCF_ERROR_NOT_SET: bad_error("scf_pg_get_parent_instance", scf_error()); } } err = libscf_instance_get_fmri(inst, &fmri); switch (err) { case 0: break; case ECONNABORTED: scf_instance_destroy(inst); return (ECONNABORTED); case ECANCELED: scf_instance_destroy(inst); return (0); default: bad_error("libscf_instance_get_fmri", err); } log_framework(LOG_DEBUG, "Graph engine: Reloading general properties for %s.\n", fmri); MUTEX_LOCK(&dgraph_lock); v = vertex_get_by_name(fmri); if (v == NULL || !(v->gv_flags & GV_CONFIGURED)) { /* Will get the up-to-date properties. */ MUTEX_UNLOCK(&dgraph_lock); err = dgraph_add_instance(fmri, inst, B_TRUE); startd_free(fmri, max_scf_fmri_size); scf_instance_destroy(inst); return (err == ECANCELED ? 0 : err); } /* Read enabled & restarter from repository. */ restarter_fmri = startd_alloc(max_scf_value_size); err = libscf_get_basic_instance_data(h, inst, v->gv_name, &enabled, &enabled_ovr, &restarter_fmri); if (err != 0 || enabled == -1) { MUTEX_UNLOCK(&dgraph_lock); scf_instance_destroy(inst); startd_free(fmri, max_scf_fmri_size); switch (err) { case ENOENT: case 0: startd_free(restarter_fmri, max_scf_value_size); return (-1); case ECONNABORTED: case ECANCELED: startd_free(restarter_fmri, max_scf_value_size); return (err); default: bad_error("libscf_get_basic_instance_data", err); } } oldflags = v->gv_flags; v->gv_flags = (v->gv_flags & ~GV_ENBLD_NOOVR) | (enabled ? GV_ENBLD_NOOVR : 0); if (enabled_ovr != -1) enabled = enabled_ovr; /* * If GV_ENBLD_NOOVR has changed, then we need to re-evaluate the * subgraph. */ if (milestone > MILESTONE_NONE && v->gv_flags != oldflags) (void) eval_subgraph(v, h); scf_instance_destroy(inst); /* Ignore restarter change for now. */ startd_free(restarter_fmri, max_scf_value_size); startd_free(fmri, max_scf_fmri_size); /* * Always send _ENABLE or _DISABLE. We could avoid this if the * restarter didn't change and the enabled value didn't change, but * that's not easy to check and improbable anyway, so we'll just do * this. */ graph_enable_by_vertex(v, enabled, 1); MUTEX_UNLOCK(&dgraph_lock); return (0); } /* * Delete all of the property group dependencies of v, update inst's running * snapshot, and add the dependencies in the new snapshot. If any of the new * dependencies would create a cycle, send _ADMIN_MAINT_ON. Otherwise * reevaluate v's dependencies, send _START or _STOP as appropriate, and do * the same for v's dependents. * * Returns * 0 - success * ECONNABORTED - repository connection broken * ECANCELED - inst was deleted * EINVAL - inst is invalid (e.g., missing general/enabled) * -1 - libscf_snapshots_refresh() failed */ static int dgraph_refresh_instance(graph_vertex_t *v, scf_instance_t *inst) { int r; int enabled; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); assert(v->gv_type == GVT_INST); /* Only refresh services with valid general/enabled properties. */ r = libscf_get_basic_instance_data(scf_instance_handle(inst), inst, v->gv_name, &enabled, NULL, NULL); switch (r) { case 0: break; case ECONNABORTED: case ECANCELED: return (r); case ENOENT: log_framework(LOG_DEBUG, "Ignoring %s because it has no general property group.\n", v->gv_name); return (EINVAL); default: bad_error("libscf_get_basic_instance_data", r); } if (enabled == -1) return (EINVAL); r = libscf_snapshots_refresh(inst, v->gv_name); if (r != 0) { if (r != -1) bad_error("libscf_snapshots_refresh", r); /* error logged */ return (r); } r = refresh_vertex(v, inst); if (r != 0 && r != ECONNABORTED) bad_error("refresh_vertex", r); return (r); } /* * Returns true only if none of this service's dependents are 'up' -- online * or degraded (offline is considered down in this situation). This function * is somehow similar to is_nonsubgraph_leaf() but works on subtrees. */ static boolean_t insubtree_dependents_down(graph_vertex_t *v) { graph_vertex_t *vv; graph_edge_t *e; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); for (e = uu_list_first(v->gv_dependents); e != NULL; e = uu_list_next(v->gv_dependents, e)) { vv = e->ge_vertex; if (vv->gv_type == GVT_INST) { if ((vv->gv_flags & GV_CONFIGURED) == 0) continue; if ((vv->gv_flags & GV_TOOFFLINE) == 0) continue; if ((vv->gv_state == RESTARTER_STATE_ONLINE) || (vv->gv_state == RESTARTER_STATE_DEGRADED)) return (B_FALSE); } else { /* * For dependency groups or service vertices, keep * traversing to see if instances are running. */ if (insubtree_dependents_down(vv) == B_FALSE) return (B_FALSE); } } return (B_TRUE); } /* * Returns true only if none of this service's dependents are 'up' -- online, * degraded, or offline. */ static int is_nonsubgraph_leaf(graph_vertex_t *v) { graph_vertex_t *vv; graph_edge_t *e; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); for (e = uu_list_first(v->gv_dependents); e != NULL; e = uu_list_next(v->gv_dependents, e)) { vv = e->ge_vertex; if (vv->gv_type == GVT_INST) { if ((vv->gv_flags & GV_CONFIGURED) == 0) continue; if (vv->gv_flags & GV_INSUBGRAPH) continue; if (up_state(vv->gv_state)) return (0); } else { /* * For dependency group or service vertices, keep * traversing to see if instances are running. * * We should skip exclude_all dependencies otherwise * the vertex will never be considered as a leaf * if the dependent is offline. The main reason for * this is that disable_nonsubgraph_leaves() skips * exclusion dependencies. */ if (vv->gv_type == GVT_GROUP && vv->gv_depgroup == DEPGRP_EXCLUDE_ALL) continue; if (!is_nonsubgraph_leaf(vv)) return (0); } } return (1); } /* * Disable v temporarily. Attempt to do this by setting its enabled override * property in the repository. If that fails, send a _DISABLE command. * Returns 0 on success and ECONNABORTED if the repository connection is * broken. */ static int disable_service_temporarily(graph_vertex_t *v, scf_handle_t *h) { const char * const emsg = "Could not temporarily disable %s because " "%s. Will stop service anyways. Repository status for the " "service may be inaccurate.\n"; const char * const emsg_cbroken = "the repository connection was broken"; scf_instance_t *inst; int r; inst = scf_instance_create(h); if (inst == NULL) { char buf[100]; (void) snprintf(buf, sizeof (buf), "scf_instance_create() failed (%s)", scf_strerror(scf_error())); log_error(LOG_WARNING, emsg, v->gv_name, buf); graph_enable_by_vertex(v, 0, 0); return (0); } r = scf_handle_decode_fmri(h, v->gv_name, NULL, NULL, inst, NULL, NULL, SCF_DECODE_FMRI_EXACT); if (r != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: log_error(LOG_WARNING, emsg, v->gv_name, emsg_cbroken); graph_enable_by_vertex(v, 0, 0); return (ECONNABORTED); case SCF_ERROR_NOT_FOUND: return (0); case SCF_ERROR_HANDLE_MISMATCH: case SCF_ERROR_INVALID_ARGUMENT: case SCF_ERROR_CONSTRAINT_VIOLATED: case SCF_ERROR_NOT_BOUND: default: bad_error("scf_handle_decode_fmri", scf_error()); } } r = libscf_set_enable_ovr(inst, 0); switch (r) { case 0: scf_instance_destroy(inst); return (0); case ECANCELED: scf_instance_destroy(inst); return (0); case ECONNABORTED: log_error(LOG_WARNING, emsg, v->gv_name, emsg_cbroken); graph_enable_by_vertex(v, 0, 0); return (ECONNABORTED); case EPERM: log_error(LOG_WARNING, emsg, v->gv_name, "the repository denied permission"); graph_enable_by_vertex(v, 0, 0); return (0); case EROFS: log_error(LOG_WARNING, emsg, v->gv_name, "the repository is read-only"); graph_enable_by_vertex(v, 0, 0); return (0); default: bad_error("libscf_set_enable_ovr", r); /* NOTREACHED */ } } /* * Of the transitive instance dependencies of v, offline those which are * in the subtree and which are leaves (i.e., have no dependents which are * "up"). */ void offline_subtree_leaves(graph_vertex_t *v, void *arg) { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); /* If v isn't an instance, recurse on its dependencies. */ if (v->gv_type != GVT_INST) { graph_walk_dependencies(v, offline_subtree_leaves, arg); return; } /* * If v is not in the subtree, so should all of its dependencies, * so do nothing. */ if ((v->gv_flags & GV_TOOFFLINE) == 0) return; /* If v isn't a leaf because it's already down, recurse. */ if (!up_state(v->gv_state)) { graph_walk_dependencies(v, offline_subtree_leaves, arg); return; } /* if v is a leaf, offline it or disable it if it's the last one */ if (insubtree_dependents_down(v) == B_TRUE) { if (v->gv_flags & GV_TODISABLE) vertex_send_event(v, RESTARTER_EVENT_TYPE_ADMIN_DISABLE); else offline_vertex(v); } } void graph_offline_subtree_leaves(graph_vertex_t *v, void *h) { graph_walk_dependencies(v, offline_subtree_leaves, (void *)h); } /* * Of the transitive instance dependencies of v, disable those which are not * in the subgraph and which are leaves (i.e., have no dependents which are * "up"). */ static void disable_nonsubgraph_leaves(graph_vertex_t *v, void *arg) { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); /* * We must skip exclusion dependencies because they are allowed to * complete dependency cycles. This is correct because A's exclusion * dependency on B doesn't bear on the order in which they should be * stopped. Indeed, the exclusion dependency should guarantee that * they are never online at the same time. */ if (v->gv_type == GVT_GROUP && v->gv_depgroup == DEPGRP_EXCLUDE_ALL) return; /* If v isn't an instance, recurse on its dependencies. */ if (v->gv_type != GVT_INST) goto recurse; if ((v->gv_flags & GV_CONFIGURED) == 0) /* * Unconfigured instances should have no dependencies, but in * case they ever get them, */ goto recurse; /* * If v is in the subgraph, so should all of its dependencies, so do * nothing. */ if (v->gv_flags & GV_INSUBGRAPH) return; /* If v isn't a leaf because it's already down, recurse. */ if (!up_state(v->gv_state)) goto recurse; /* If v is disabled but not down yet, be patient. */ if ((v->gv_flags & GV_ENABLED) == 0) return; /* If v is a leaf, disable it. */ if (is_nonsubgraph_leaf(v)) (void) disable_service_temporarily(v, (scf_handle_t *)arg); return; recurse: graph_walk_dependencies(v, disable_nonsubgraph_leaves, arg); } /* * Find the vertex for inst_name. If it doesn't exist, return ENOENT. * Otherwise set its state to state. If the instance has entered a state * which requires automatic action, take it (Uninitialized: do * dgraph_refresh_instance() without the snapshot update. Disabled: if the * instance should be enabled, send _ENABLE. Offline: if the instance should * be disabled, send _DISABLE, and if its dependencies are satisfied, send * _START. Online, Degraded: if the instance wasn't running, update its start * snapshot. Maintenance: no action.) * * Also fails with ECONNABORTED, or EINVAL if state is invalid. */ static int dgraph_set_instance_state(scf_handle_t *h, const char *inst_name, restarter_instance_state_t state, restarter_error_t serr) { graph_vertex_t *v; int err = 0; restarter_instance_state_t old_state; MUTEX_LOCK(&dgraph_lock); v = vertex_get_by_name(inst_name); if (v == NULL) { MUTEX_UNLOCK(&dgraph_lock); return (ENOENT); } assert(v->gv_type == GVT_INST); switch (state) { case RESTARTER_STATE_UNINIT: case RESTARTER_STATE_DISABLED: case RESTARTER_STATE_OFFLINE: case RESTARTER_STATE_ONLINE: case RESTARTER_STATE_DEGRADED: case RESTARTER_STATE_MAINT: break; default: MUTEX_UNLOCK(&dgraph_lock); return (EINVAL); } log_framework(LOG_DEBUG, "Graph noting %s %s -> %s.\n", v->gv_name, instance_state_str[v->gv_state], instance_state_str[state]); old_state = v->gv_state; v->gv_state = state; err = gt_transition(h, v, serr, old_state); MUTEX_UNLOCK(&dgraph_lock); return (err); } /* * Handle state changes during milestone shutdown. See * dgraph_set_milestone(). If the repository connection is broken, * ECONNABORTED will be returned, though a _DISABLE command will be sent for * the vertex anyway. */ int vertex_subgraph_dependencies_shutdown(scf_handle_t *h, graph_vertex_t *v, restarter_instance_state_t old_state) { int was_up, now_up; int ret = 0; assert(v->gv_type == GVT_INST); /* Don't care if we're not going to a milestone. */ if (milestone == NULL) return (0); /* Don't care if we already finished coming down. */ if (non_subgraph_svcs == 0) return (0); /* Don't care if the service is in the subgraph. */ if (v->gv_flags & GV_INSUBGRAPH) return (0); /* * Update non_subgraph_svcs. It is the number of non-subgraph * services which are in online, degraded, or offline. */ was_up = up_state(old_state); now_up = up_state(v->gv_state); if (!was_up && now_up) { ++non_subgraph_svcs; } else if (was_up && !now_up) { --non_subgraph_svcs; if (non_subgraph_svcs == 0) { if (halting != -1) { do_uadmin(); } else if (go_single_user_mode || go_to_level1) { (void) startd_thread_create(single_user_thread, NULL); } return (0); } } /* If this service is a leaf, it should be disabled. */ if ((v->gv_flags & GV_ENABLED) && is_nonsubgraph_leaf(v)) { int r; r = disable_service_temporarily(v, h); switch (r) { case 0: break; case ECONNABORTED: ret = ECONNABORTED; break; default: bad_error("disable_service_temporarily", r); } } /* * If the service just came down, propagate the disable to the newly * exposed leaves. */ if (was_up && !now_up) graph_walk_dependencies(v, disable_nonsubgraph_leaves, (void *)h); return (ret); } /* * Decide whether to start up an sulogin thread after a service is * finished changing state. Only need to do the full can_come_up() * evaluation if an instance is changing state, we're not halfway through * loading the thread, and we aren't shutting down or going to the single * user milestone. */ void graph_transition_sulogin(restarter_instance_state_t state, restarter_instance_state_t old_state) { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); if (state != old_state && st->st_load_complete && !go_single_user_mode && !go_to_level1 && halting == -1) { if (!sulogin_thread_running && !can_come_up()) { (void) startd_thread_create(sulogin_thread, NULL); sulogin_thread_running = B_TRUE; } } } /* * Propagate a start, stop event, or a satisfiability event. * * PROPAGATE_START and PROPAGATE_STOP simply propagate the transition event * to direct dependents. PROPAGATE_SAT propagates a start then walks the * full dependent graph to check for newly satisfied nodes. This is * necessary for cases when non-direct dependents may be effected but direct * dependents may not (e.g. for optional_all evaluations, see the * propagate_satbility() comments). * * PROPAGATE_SAT should be used whenever a non-running service moves into * a state which can satisfy optional dependencies, like disabled or * maintenance. */ void graph_transition_propagate(graph_vertex_t *v, propagate_event_t type, restarter_error_t rerr) { if (type == PROPAGATE_STOP) { graph_walk_dependents(v, propagate_stop, (void *)rerr); } else if (type == PROPAGATE_START || type == PROPAGATE_SAT) { graph_walk_dependents(v, propagate_start, NULL); if (type == PROPAGATE_SAT) propagate_satbility(v); } else { #ifndef NDEBUG uu_warn("%s:%d: Unexpected type value %d.\n", __FILE__, __LINE__, type); #endif abort(); } } /* * If a vertex for fmri exists and it is enabled, send _DISABLE to the * restarter. If it is running, send _STOP. Send _REMOVE_INSTANCE. Delete * all property group dependencies, and the dependency on the restarter, * disposing of vertices as appropriate. If other vertices depend on this * one, mark it unconfigured and return. Otherwise remove the vertex. Always * returns 0. */ static int dgraph_remove_instance(const char *fmri, scf_handle_t *h) { graph_vertex_t *v; graph_edge_t *e; uu_list_t *old_deps; int err; log_framework(LOG_DEBUG, "Graph engine: Removing %s.\n", fmri); MUTEX_LOCK(&dgraph_lock); v = vertex_get_by_name(fmri); if (v == NULL) { MUTEX_UNLOCK(&dgraph_lock); return (0); } /* Send restarter delete event. */ if (v->gv_flags & GV_CONFIGURED) graph_unset_restarter(v); if (milestone > MILESTONE_NONE) { /* * Make a list of v's current dependencies so we can * reevaluate their GV_INSUBGRAPH flags after the dependencies * are removed. */ old_deps = startd_list_create(graph_edge_pool, NULL, 0); err = uu_list_walk(v->gv_dependencies, (uu_walk_fn_t *)append_svcs_or_insts, old_deps, 0); assert(err == 0); } delete_instance_dependencies(v, B_TRUE); /* * Deleting an instance can both satisfy and unsatisfy dependencies, * depending on their type. First propagate the stop as a RERR_RESTART * event -- deletion isn't a fault, just a normal stop. This gives * dependent services the chance to do a clean shutdown. Then, mark * the service as unconfigured and propagate the start event for the * optional_all dependencies that might have become satisfied. */ graph_walk_dependents(v, propagate_stop, (void *)RERR_RESTART); v->gv_flags &= ~GV_CONFIGURED; v->gv_flags &= ~GV_DEATHROW; graph_walk_dependents(v, propagate_start, NULL); propagate_satbility(v); /* * If there are no (non-service) dependents, the vertex can be * completely removed. */ if (v != milestone && v->gv_refs == 0 && uu_list_numnodes(v->gv_dependents) == 1) remove_inst_vertex(v); if (milestone > MILESTONE_NONE) { void *cookie = NULL; while ((e = uu_list_teardown(old_deps, &cookie)) != NULL) { v = e->ge_vertex; if (vertex_unref(v) == VERTEX_INUSE) while (eval_subgraph(v, h) == ECONNABORTED) libscf_handle_rebind(h); startd_free(e, sizeof (*e)); } uu_list_destroy(old_deps); } MUTEX_UNLOCK(&dgraph_lock); return (0); } /* * Return the eventual (maybe current) milestone in the form of a * legacy runlevel. */ static char target_milestone_as_runlevel() { assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); if (milestone == NULL) return ('3'); else if (milestone == MILESTONE_NONE) return ('0'); if (strcmp(milestone->gv_name, multi_user_fmri) == 0) return ('2'); else if (strcmp(milestone->gv_name, single_user_fmri) == 0) return ('S'); else if (strcmp(milestone->gv_name, multi_user_svr_fmri) == 0) return ('3'); #ifndef NDEBUG (void) fprintf(stderr, "%s:%d: Unknown milestone name \"%s\".\n", __FILE__, __LINE__, milestone->gv_name); #endif abort(); /* NOTREACHED */ } static struct { char rl; int sig; } init_sigs[] = { { 'S', SIGBUS }, { '0', SIGINT }, { '1', SIGQUIT }, { '2', SIGILL }, { '3', SIGTRAP }, { '4', SIGIOT }, { '5', SIGEMT }, { '6', SIGFPE }, { 0, 0 } }; static void signal_init(char rl) { pid_t init_pid; int i; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); if (zone_getattr(getzoneid(), ZONE_ATTR_INITPID, &init_pid, sizeof (init_pid)) != sizeof (init_pid)) { log_error(LOG_NOTICE, "Could not get pid to signal init.\n"); return; } for (i = 0; init_sigs[i].rl != 0; ++i) if (init_sigs[i].rl == rl) break; if (init_sigs[i].rl != 0) { if (kill(init_pid, init_sigs[i].sig) != 0) { switch (errno) { case EPERM: case ESRCH: log_error(LOG_NOTICE, "Could not signal init: " "%s.\n", strerror(errno)); break; case EINVAL: default: bad_error("kill", errno); } } } } /* * This is called when one of the major milestones changes state, or when * init is signalled and tells us it was told to change runlevel. We wait * to reach the milestone because this allows /etc/inittab entries to retain * some boot ordering: historically, entries could place themselves before/after * the running of /sbin/rcX scripts but we can no longer make the * distinction because the /sbin/rcX scripts no longer exist as punctuation * marks in /etc/inittab. * * Also, we only trigger an update when we reach the eventual target * milestone: without this, an /etc/inittab entry marked only for * runlevel 2 would be executed for runlevel 3, which is not how * /etc/inittab entries work. * * If we're single user coming online, then we set utmpx to the target * runlevel so that legacy scripts can work as expected. */ static void graph_runlevel_changed(char rl, int online) { char trl; assert(PTHREAD_MUTEX_HELD(&dgraph_lock)); trl = target_milestone_as_runlevel(); if (online) { if (rl == trl) { current_runlevel = trl; signal_init(trl); } else if (rl == 'S') { /* * At boot, set the entry early for the benefit of the * legacy init scripts. */ utmpx_set_runlevel(trl, 'S', B_FALSE); } } else { if (rl == '3' && trl == '2') { current_runlevel = trl; signal_init(trl); } else if (rl == '2' && trl == 'S') { current_runlevel = trl; signal_init(trl); } } } /* * Move to a backwards-compatible runlevel by executing the appropriate * /etc/rc?.d/K* scripts and/or setting the milestone. * * Returns * 0 - success * ECONNRESET - success, but handle was reset * ECONNABORTED - repository connection broken * ECANCELED - pg was deleted */ static int dgraph_set_runlevel(scf_propertygroup_t *pg, scf_property_t *prop) { char rl; scf_handle_t *h; int r; const char *ms = NULL; /* what to commit as options/milestone */ boolean_t rebound = B_FALSE; int mark_rl = 0; const char * const stop = "stop"; r = libscf_extract_runlevel(prop, &rl); switch (r) { case 0: break; case ECONNABORTED: case ECANCELED: return (r); case EINVAL: case ENOENT: log_error(LOG_WARNING, "runlevel property is misconfigured; " "ignoring.\n"); /* delete the bad property */ goto nolock_out; default: bad_error("libscf_extract_runlevel", r); } switch (rl) { case 's': rl = 'S'; /* FALLTHROUGH */ case 'S': case '2': case '3': /* * These cases cause a milestone change, so * graph_runlevel_changed() will eventually deal with * signalling init. */ break; case '0': case '1': case '4': case '5': case '6': mark_rl = 1; break; default: log_framework(LOG_NOTICE, "Unknown runlevel '%c'.\n", rl); ms = NULL; goto nolock_out; } h = scf_pg_handle(pg); MUTEX_LOCK(&dgraph_lock); /* * Since this triggers no milestone changes, force it by hand. */ if (current_runlevel == '4' && rl == '3') mark_rl = 1; /* * 1. If we are here after an "init X": * * init X * init/lscf_set_runlevel() * process_pg_event() * dgraph_set_runlevel() * * then we haven't passed through graph_runlevel_changed() yet, * therefore 'current_runlevel' has not changed for sure but 'rl' has. * In consequence, if 'rl' is lower than 'current_runlevel', we change * the system runlevel and execute the appropriate /etc/rc?.d/K* scripts * past this test. * * 2. On the other hand, if we are here after a "svcadm milestone": * * svcadm milestone X * dgraph_set_milestone() * handle_graph_update_event() * dgraph_set_instance_state() * graph_post_X_[online|offline]() * graph_runlevel_changed() * signal_init() * init/lscf_set_runlevel() * process_pg_event() * dgraph_set_runlevel() * * then we already passed through graph_runlevel_changed() (by the way * of dgraph_set_milestone()) and 'current_runlevel' may have changed * and already be equal to 'rl' so we are going to return immediately * from dgraph_set_runlevel() without changing the system runlevel and * without executing the /etc/rc?.d/K* scripts. */ if (rl == current_runlevel) { ms = NULL; goto out; } log_framework(LOG_DEBUG, "Changing to runlevel '%c'.\n", rl); /* * Make sure stop rc scripts see the new settings via who -r. */ utmpx_set_runlevel(rl, current_runlevel, B_TRUE); /* * Some run levels don't have a direct correspondence to any * milestones, so we have to signal init directly. */ if (mark_rl) { current_runlevel = rl; signal_init(rl); } switch (rl) { case 'S': uu_warn("The system is coming down for administration. " "Please wait.\n"); fork_rc_script(rl, stop, B_FALSE); ms = single_user_fmri; go_single_user_mode = B_TRUE; break; case '0': fork_rc_script(rl, stop, B_TRUE); halting = AD_HALT; goto uadmin; case '5': fork_rc_script(rl, stop, B_TRUE); halting = AD_POWEROFF; goto uadmin; case '6': fork_rc_script(rl, stop, B_TRUE); halting = AD_BOOT; goto uadmin; uadmin: uu_warn("The system is coming down. Please wait.\n"); ms = "none"; /* * We can't wait until all services are offline since this * thread is responsible for taking them offline. Instead we * set halting to the second argument for uadmin() and call * do_uadmin() from dgraph_set_instance_state() when * appropriate. */ break; case '1': if (current_runlevel != 'S') { uu_warn("Changing to state 1.\n"); fork_rc_script(rl, stop, B_FALSE); } else { uu_warn("The system is coming up for administration. " "Please wait.\n"); } ms = single_user_fmri; go_to_level1 = B_TRUE; break; case '2': if (current_runlevel == '3' || current_runlevel == '4') fork_rc_script(rl, stop, B_FALSE); ms = multi_user_fmri; break; case '3': case '4': ms = "all"; break; default: #ifndef NDEBUG (void) fprintf(stderr, "%s:%d: Uncaught case %d ('%c').\n", __FILE__, __LINE__, rl, rl); #endif abort(); } out: MUTEX_UNLOCK(&dgraph_lock); nolock_out: switch (r = libscf_clear_runlevel(pg, ms)) { case 0: break; case ECONNABORTED: libscf_handle_rebind(h); rebound = B_TRUE; goto nolock_out; case ECANCELED: break; case EPERM: case EACCES: case EROFS: log_error(LOG_NOTICE, "Could not delete \"%s/%s\" property: " "%s.\n", SCF_PG_OPTIONS, "runlevel", strerror(r)); break; default: bad_error("libscf_clear_runlevel", r); } return (rebound ? ECONNRESET : 0); } /* * mark_subtree walks the dependents and add the GV_TOOFFLINE flag * to the instances that are supposed to go offline during an * administrative disable operation. */ static int mark_subtree(graph_edge_t *e, void *arg) { graph_vertex_t *v; int r; v = e->ge_vertex; /* If it's already in the subgraph, skip. */ if (v->gv_flags & GV_TOOFFLINE) return (UU_WALK_NEXT); switch (v->gv_type) { case GVT_INST: /* If the instance is already disabled, skip it. */ if (!(v->gv_flags & GV_ENABLED)) return (UU_WALK_NEXT); v->gv_flags |= GV_TOOFFLINE; log_framework(LOG_DEBUG, "%s added to subtree\n", v->gv_name); break; case GVT_GROUP: /* * Skip all excluded dependencies and decide whether to offline * the service based on restart_on attribute. */ if (v->gv_depgroup == DEPGRP_EXCLUDE_ALL || v->gv_restart < RERR_RESTART) return (UU_WALK_NEXT); break; } r = uu_list_walk(v->gv_dependents, (uu_walk_fn_t *)mark_subtree, arg, 0); assert(r == 0); return (UU_WALK_NEXT); } static int mark_subgraph(graph_edge_t *e, void *arg) { graph_vertex_t *v; int r; int optional = (int)arg; v = e->ge_vertex; /* If it's already in the subgraph, skip. */ if (v->gv_flags & GV_INSUBGRAPH) return (UU_WALK_NEXT); /* * Keep track if walk has entered an optional dependency group */ if (v->gv_type == GVT_GROUP && v->gv_depgroup == DEPGRP_OPTIONAL_ALL) { optional = 1; } /* * Quit if we are in an optional dependency group and the instance * is disabled */ if (optional && (v->gv_type == GVT_INST) && (!(v->gv_flags & GV_ENBLD_NOOVR))) return (UU_WALK_NEXT); v->gv_flags |= GV_INSUBGRAPH; /* Skip all excluded dependencies. */ if (v->gv_type == GVT_GROUP && v->gv_depgroup == DEPGRP_EXCLUDE_ALL) return (UU_WALK_NEXT); r = uu_list_walk(v->gv_dependencies, (uu_walk_fn_t *)mark_subgraph, (void *)optional, 0); assert(r == 0); return (UU_WALK_NEXT); } /* * Bring down all services which are not dependencies of fmri. The * dependencies of fmri (direct & indirect) will constitute the "subgraph", * and will have the GV_INSUBGRAPH flag set. The rest must be brought down, * which means the state is "disabled", "maintenance", or "uninitialized". We * could consider "offline" to be down, and refrain from sending start * commands for such services, but that's not strictly necessary, so we'll * decline to intrude on the state machine. It would probably confuse users * anyway. * * The services should be brought down in reverse-dependency order, so we * can't do it all at once here. We initiate by override-disabling the leaves * of the dependency tree -- those services which are up but have no * dependents which are up. When they come down, * vertex_subgraph_dependencies_shutdown() will override-disable the newly * exposed leaves. Perseverance will ensure completion. * * Sometimes we need to take action when the transition is complete, like * start sulogin or halt the system. To tell when we're done, we initialize * non_subgraph_svcs here to be the number of services which need to come * down. As each does, we decrement the counter. When it hits zero, we take * the appropriate action. See vertex_subgraph_dependencies_shutdown(). * * In case we're coming up, we also remove any enable-overrides for the * services which are dependencies of fmri. * * If norepository is true, the function will not change the repository. * * The decision to change the system run level in accordance with the milestone * is taken in dgraph_set_runlevel(). * * Returns * 0 - success * ECONNRESET - success, but handle was rebound * EINVAL - fmri is invalid (error is logged) * EALREADY - the milestone is already set to fmri * ENOENT - a configured vertex does not exist for fmri (an error is logged) */ static int dgraph_set_milestone(const char *fmri, scf_handle_t *h, boolean_t norepository) { const char *cfmri, *fs; graph_vertex_t *nm, *v; int ret = 0, r; scf_instance_t *inst; boolean_t isall, isnone, rebound = B_FALSE; /* Validate fmri */ isall = (strcmp(fmri, "all") == 0); isnone = (strcmp(fmri, "none") == 0); if (!isall && !isnone) { if (fmri_canonify(fmri, (char **)&cfmri, B_FALSE) == EINVAL) goto reject; if (strcmp(cfmri, single_user_fmri) != 0 && strcmp(cfmri, multi_user_fmri) != 0 && strcmp(cfmri, multi_user_svr_fmri) != 0) { startd_free((void *)cfmri, max_scf_fmri_size); reject: log_framework(LOG_WARNING, "Rejecting request for invalid milestone \"%s\".\n", fmri); return (EINVAL); } } inst = safe_scf_instance_create(h); MUTEX_LOCK(&dgraph_lock); if (milestone == NULL) { if (isall) { log_framework(LOG_DEBUG, "Milestone already set to all.\n"); ret = EALREADY; goto out; } } else if (milestone == MILESTONE_NONE) { if (isnone) { log_framework(LOG_DEBUG, "Milestone already set to none.\n"); ret = EALREADY; goto out; } } else { if (!isall && !isnone && strcmp(cfmri, milestone->gv_name) == 0) { log_framework(LOG_DEBUG, "Milestone already set to %s.\n", cfmri); ret = EALREADY; goto out; } } if (!isall && !isnone) { nm = vertex_get_by_name(cfmri); if (nm == NULL || !(nm->gv_flags & GV_CONFIGURED)) { log_framework(LOG_WARNING, "Cannot set milestone to %s " "because no such service exists.\n", cfmri); ret = ENOENT; goto out; } } log_framework(LOG_DEBUG, "Changing milestone to %s.\n", fmri); /* * Set milestone, removing the old one if this was the last reference. */ if (milestone > MILESTONE_NONE) (void) vertex_unref(milestone); if (isall) milestone = NULL; else if (isnone) milestone = MILESTONE_NONE; else { milestone = nm; /* milestone should count as a reference */ vertex_ref(milestone); } /* Clear all GV_INSUBGRAPH bits. */ for (v = uu_list_first(dgraph); v != NULL; v = uu_list_next(dgraph, v)) v->gv_flags &= ~GV_INSUBGRAPH; if (!isall && !isnone) { /* Set GV_INSUBGRAPH for milestone & descendents. */ milestone->gv_flags |= GV_INSUBGRAPH; r = uu_list_walk(milestone->gv_dependencies, (uu_walk_fn_t *)mark_subgraph, NULL, 0); assert(r == 0); } /* Un-override services in the subgraph & override-disable the rest. */ if (norepository) goto out; non_subgraph_svcs = 0; for (v = uu_list_first(dgraph); v != NULL; v = uu_list_next(dgraph, v)) { if (v->gv_type != GVT_INST || (v->gv_flags & GV_CONFIGURED) == 0) continue; again: r = scf_handle_decode_fmri(h, v->gv_name, NULL, NULL, inst, NULL, NULL, SCF_DECODE_FMRI_EXACT); if (r != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: default: libscf_handle_rebind(h); rebound = B_TRUE; goto again; case SCF_ERROR_NOT_FOUND: continue; case SCF_ERROR_HANDLE_MISMATCH: case SCF_ERROR_INVALID_ARGUMENT: case SCF_ERROR_CONSTRAINT_VIOLATED: case SCF_ERROR_NOT_BOUND: bad_error("scf_handle_decode_fmri", scf_error()); } } if (isall || (v->gv_flags & GV_INSUBGRAPH)) { r = libscf_delete_enable_ovr(inst); fs = "libscf_delete_enable_ovr"; } else { assert(isnone || (v->gv_flags & GV_INSUBGRAPH) == 0); /* * Services which are up need to come down before * we're done, but we can only disable the leaves * here. */ if (up_state(v->gv_state)) ++non_subgraph_svcs; /* If it's already disabled, don't bother. */ if ((v->gv_flags & GV_ENABLED) == 0) continue; if (!is_nonsubgraph_leaf(v)) continue; r = libscf_set_enable_ovr(inst, 0); fs = "libscf_set_enable_ovr"; } switch (r) { case 0: case ECANCELED: break; case ECONNABORTED: libscf_handle_rebind(h); rebound = B_TRUE; goto again; case EPERM: case EROFS: log_error(LOG_WARNING, "Could not set %s/%s for %s: %s.\n", SCF_PG_GENERAL_OVR, SCF_PROPERTY_ENABLED, v->gv_name, strerror(r)); break; default: bad_error(fs, r); } } if (halting != -1) { if (non_subgraph_svcs > 1) uu_warn("%d system services are now being stopped.\n", non_subgraph_svcs); else if (non_subgraph_svcs == 1) uu_warn("One system service is now being stopped.\n"); else if (non_subgraph_svcs == 0) do_uadmin(); } ret = rebound ? ECONNRESET : 0; out: MUTEX_UNLOCK(&dgraph_lock); if (!isall && !isnone) startd_free((void *)cfmri, max_scf_fmri_size); scf_instance_destroy(inst); return (ret); } /* * Returns 0, ECONNABORTED, or EINVAL. */ static int handle_graph_update_event(scf_handle_t *h, graph_protocol_event_t *e) { int r; switch (e->gpe_type) { case GRAPH_UPDATE_RELOAD_GRAPH: log_error(LOG_WARNING, "graph_event: reload graph unimplemented\n"); break; case GRAPH_UPDATE_STATE_CHANGE: { protocol_states_t *states = e->gpe_data; switch (r = dgraph_set_instance_state(h, e->gpe_inst, states->ps_state, states->ps_err)) { case 0: case ENOENT: break; case ECONNABORTED: return (ECONNABORTED); case EINVAL: default: #ifndef NDEBUG (void) fprintf(stderr, "dgraph_set_instance_state() " "failed with unexpected error %d at %s:%d.\n", r, __FILE__, __LINE__); #endif abort(); } startd_free(states, sizeof (protocol_states_t)); break; } default: log_error(LOG_WARNING, "graph_event_loop received an unknown event: %d\n", e->gpe_type); break; } return (0); } /* * graph_event_thread() * Wait for state changes from the restarters. */ /*ARGSUSED*/ void * graph_event_thread(void *unused) { scf_handle_t *h; int err; h = libscf_handle_create_bound_loop(); /*CONSTCOND*/ while (1) { graph_protocol_event_t *e; MUTEX_LOCK(&gu->gu_lock); while (gu->gu_wakeup == 0) (void) pthread_cond_wait(&gu->gu_cv, &gu->gu_lock); gu->gu_wakeup = 0; while ((e = graph_event_dequeue()) != NULL) { MUTEX_LOCK(&e->gpe_lock); MUTEX_UNLOCK(&gu->gu_lock); while ((err = handle_graph_update_event(h, e)) == ECONNABORTED) libscf_handle_rebind(h); if (err == 0) graph_event_release(e); else graph_event_requeue(e); MUTEX_LOCK(&gu->gu_lock); } MUTEX_UNLOCK(&gu->gu_lock); } /* * Unreachable for now -- there's currently no graceful cleanup * called on exit(). */ MUTEX_UNLOCK(&gu->gu_lock); scf_handle_destroy(h); return (NULL); } static void set_initial_milestone(scf_handle_t *h) { scf_instance_t *inst; char *fmri, *cfmri; size_t sz; int r; inst = safe_scf_instance_create(h); fmri = startd_alloc(max_scf_fmri_size); /* * If -m milestone= was specified, we want to set options_ovr/milestone * to it. Otherwise we want to read what the milestone should be set * to. Either way we need our inst. */ get_self: if (scf_handle_decode_fmri(h, SCF_SERVICE_STARTD, NULL, NULL, inst, NULL, NULL, SCF_DECODE_FMRI_EXACT) != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: libscf_handle_rebind(h); goto get_self; case SCF_ERROR_NOT_FOUND: if (st->st_subgraph != NULL && st->st_subgraph[0] != '\0') { sz = strlcpy(fmri, st->st_subgraph, max_scf_fmri_size); assert(sz < max_scf_fmri_size); } else { fmri[0] = '\0'; } break; case SCF_ERROR_INVALID_ARGUMENT: case SCF_ERROR_CONSTRAINT_VIOLATED: case SCF_ERROR_HANDLE_MISMATCH: default: bad_error("scf_handle_decode_fmri", scf_error()); } } else { if (st->st_subgraph != NULL && st->st_subgraph[0] != '\0') { scf_propertygroup_t *pg; pg = safe_scf_pg_create(h); sz = strlcpy(fmri, st->st_subgraph, max_scf_fmri_size); assert(sz < max_scf_fmri_size); r = libscf_inst_get_or_add_pg(inst, SCF_PG_OPTIONS_OVR, SCF_PG_OPTIONS_OVR_TYPE, SCF_PG_OPTIONS_OVR_FLAGS, pg); switch (r) { case 0: break; case ECONNABORTED: libscf_handle_rebind(h); goto get_self; case EPERM: case EACCES: case EROFS: log_error(LOG_WARNING, "Could not set %s/%s: " "%s.\n", SCF_PG_OPTIONS_OVR, SCF_PROPERTY_MILESTONE, strerror(r)); /* FALLTHROUGH */ case ECANCELED: sz = strlcpy(fmri, st->st_subgraph, max_scf_fmri_size); assert(sz < max_scf_fmri_size); break; default: bad_error("libscf_inst_get_or_add_pg", r); } r = libscf_clear_runlevel(pg, fmri); switch (r) { case 0: break; case ECONNABORTED: libscf_handle_rebind(h); goto get_self; case EPERM: case EACCES: case EROFS: log_error(LOG_WARNING, "Could not set %s/%s: " "%s.\n", SCF_PG_OPTIONS_OVR, SCF_PROPERTY_MILESTONE, strerror(r)); /* FALLTHROUGH */ case ECANCELED: sz = strlcpy(fmri, st->st_subgraph, max_scf_fmri_size); assert(sz < max_scf_fmri_size); break; default: bad_error("libscf_clear_runlevel", r); } scf_pg_destroy(pg); } else { scf_property_t *prop; scf_value_t *val; prop = safe_scf_property_create(h); val = safe_scf_value_create(h); r = libscf_get_milestone(inst, prop, val, fmri, max_scf_fmri_size); switch (r) { case 0: break; case ECONNABORTED: libscf_handle_rebind(h); goto get_self; case EINVAL: log_error(LOG_WARNING, "Milestone property is " "misconfigured. Defaulting to \"all\".\n"); /* FALLTHROUGH */ case ECANCELED: case ENOENT: fmri[0] = '\0'; break; default: bad_error("libscf_get_milestone", r); } scf_value_destroy(val); scf_property_destroy(prop); } } if (fmri[0] == '\0' || strcmp(fmri, "all") == 0) goto out; if (strcmp(fmri, "none") != 0) { retry: if (scf_handle_decode_fmri(h, fmri, NULL, NULL, inst, NULL, NULL, SCF_DECODE_FMRI_EXACT) != 0) { switch (scf_error()) { case SCF_ERROR_INVALID_ARGUMENT: log_error(LOG_WARNING, "Requested milestone \"%s\" is invalid. " "Reverting to \"all\".\n", fmri); goto out; case SCF_ERROR_CONSTRAINT_VIOLATED: log_error(LOG_WARNING, "Requested milestone " "\"%s\" does not specify an instance. " "Reverting to \"all\".\n", fmri); goto out; case SCF_ERROR_CONNECTION_BROKEN: libscf_handle_rebind(h); goto retry; case SCF_ERROR_NOT_FOUND: log_error(LOG_WARNING, "Requested milestone " "\"%s\" not in repository. Reverting to " "\"all\".\n", fmri); goto out; case SCF_ERROR_HANDLE_MISMATCH: default: bad_error("scf_handle_decode_fmri", scf_error()); } } r = fmri_canonify(fmri, &cfmri, B_FALSE); assert(r == 0); r = dgraph_add_instance(cfmri, inst, B_TRUE); startd_free(cfmri, max_scf_fmri_size); switch (r) { case 0: break; case ECONNABORTED: goto retry; case EINVAL: log_error(LOG_WARNING, "Requested milestone \"%s\" is invalid. " "Reverting to \"all\".\n", fmri); goto out; case ECANCELED: log_error(LOG_WARNING, "Requested milestone \"%s\" not " "in repository. Reverting to \"all\".\n", fmri); goto out; case EEXIST: default: bad_error("dgraph_add_instance", r); } } log_console(LOG_INFO, "Booting to milestone \"%s\".\n", fmri); r = dgraph_set_milestone(fmri, h, B_FALSE); switch (r) { case 0: case ECONNRESET: case EALREADY: break; case EINVAL: case ENOENT: default: bad_error("dgraph_set_milestone", r); } out: startd_free(fmri, max_scf_fmri_size); scf_instance_destroy(inst); } void set_restart_milestone(scf_handle_t *h) { scf_instance_t *inst; scf_property_t *prop; scf_value_t *val; char *fmri; int r; inst = safe_scf_instance_create(h); get_self: if (scf_handle_decode_fmri(h, SCF_SERVICE_STARTD, NULL, NULL, inst, NULL, NULL, SCF_DECODE_FMRI_EXACT) != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: libscf_handle_rebind(h); goto get_self; case SCF_ERROR_NOT_FOUND: break; case SCF_ERROR_INVALID_ARGUMENT: case SCF_ERROR_CONSTRAINT_VIOLATED: case SCF_ERROR_HANDLE_MISMATCH: default: bad_error("scf_handle_decode_fmri", scf_error()); } scf_instance_destroy(inst); return; } prop = safe_scf_property_create(h); val = safe_scf_value_create(h); fmri = startd_alloc(max_scf_fmri_size); r = libscf_get_milestone(inst, prop, val, fmri, max_scf_fmri_size); switch (r) { case 0: break; case ECONNABORTED: libscf_handle_rebind(h); goto get_self; case ECANCELED: case ENOENT: case EINVAL: goto out; default: bad_error("libscf_get_milestone", r); } r = dgraph_set_milestone(fmri, h, B_TRUE); switch (r) { case 0: case ECONNRESET: case EALREADY: case EINVAL: case ENOENT: break; default: bad_error("dgraph_set_milestone", r); } out: startd_free(fmri, max_scf_fmri_size); scf_value_destroy(val); scf_property_destroy(prop); scf_instance_destroy(inst); } /* * void *graph_thread(void *) * * Graph management thread. */ /*ARGSUSED*/ void * graph_thread(void *arg) { scf_handle_t *h; int err; h = libscf_handle_create_bound_loop(); if (st->st_initial) set_initial_milestone(h); MUTEX_LOCK(&dgraph_lock); initial_milestone_set = B_TRUE; err = pthread_cond_broadcast(&initial_milestone_cv); assert(err == 0); MUTEX_UNLOCK(&dgraph_lock); libscf_populate_graph(h); if (!st->st_initial) set_restart_milestone(h); MUTEX_LOCK(&st->st_load_lock); st->st_load_complete = 1; (void) pthread_cond_broadcast(&st->st_load_cv); MUTEX_UNLOCK(&st->st_load_lock); MUTEX_LOCK(&dgraph_lock); /* * Now that we've set st_load_complete we need to check can_come_up() * since if we booted to a milestone, then there won't be any more * state updates. */ if (!go_single_user_mode && !go_to_level1 && halting == -1) { if (!sulogin_thread_running && !can_come_up()) { (void) startd_thread_create(sulogin_thread, NULL); sulogin_thread_running = B_TRUE; } } MUTEX_UNLOCK(&dgraph_lock); (void) pthread_mutex_lock(&gu->gu_freeze_lock); /*CONSTCOND*/ while (1) { (void) pthread_cond_wait(&gu->gu_freeze_cv, &gu->gu_freeze_lock); } /* * Unreachable for now -- there's currently no graceful cleanup * called on exit(). */ (void) pthread_mutex_unlock(&gu->gu_freeze_lock); scf_handle_destroy(h); return (NULL); } /* * int next_action() * Given an array of timestamps 'a' with 'num' elements, find the * lowest non-zero timestamp and return its index. If there are no * non-zero elements, return -1. */ static int next_action(hrtime_t *a, int num) { hrtime_t t = 0; int i = 0, smallest = -1; for (i = 0; i < num; i++) { if (t == 0) { t = a[i]; smallest = i; } else if (a[i] != 0 && a[i] < t) { t = a[i]; smallest = i; } } if (t == 0) return (-1); else return (smallest); } /* * void process_actions() * Process actions requested by the administrator. Possibilities include: * refresh, restart, maintenance mode off, maintenance mode on, * maintenance mode immediate, and degraded. * * The set of pending actions is represented in the repository as a * per-instance property group, with each action being a single property * in that group. This property group is converted to an array, with each * action type having an array slot. The actions in the array at the * time process_actions() is called are acted on in the order of the * timestamp (which is the value stored in the slot). A value of zero * indicates that there is no pending action of the type associated with * a particular slot. * * Sending an action event multiple times before the restarter has a * chance to process that action will force it to be run at the last * timestamp where it appears in the ordering. * * Turning maintenance mode on trumps all other actions. * * Returns 0 or ECONNABORTED. */ static int process_actions(scf_handle_t *h, scf_propertygroup_t *pg, scf_instance_t *inst) { scf_property_t *prop = NULL; scf_value_t *val = NULL; scf_type_t type; graph_vertex_t *vertex; admin_action_t a; int i, ret = 0, r; hrtime_t action_ts[NACTIONS]; char *inst_name; r = libscf_instance_get_fmri(inst, &inst_name); switch (r) { case 0: break; case ECONNABORTED: return (ECONNABORTED); case ECANCELED: return (0); default: bad_error("libscf_instance_get_fmri", r); } MUTEX_LOCK(&dgraph_lock); vertex = vertex_get_by_name(inst_name); if (vertex == NULL) { MUTEX_UNLOCK(&dgraph_lock); startd_free(inst_name, max_scf_fmri_size); log_framework(LOG_DEBUG, "%s: Can't find graph vertex. " "The instance must have been removed.\n", inst_name); return (0); } prop = safe_scf_property_create(h); val = safe_scf_value_create(h); for (i = 0; i < NACTIONS; i++) { if (scf_pg_get_property(pg, admin_actions[i], prop) != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: default: ret = ECONNABORTED; goto out; case SCF_ERROR_DELETED: goto out; case SCF_ERROR_NOT_FOUND: action_ts[i] = 0; continue; case SCF_ERROR_HANDLE_MISMATCH: case SCF_ERROR_INVALID_ARGUMENT: case SCF_ERROR_NOT_SET: bad_error("scf_pg_get_property", scf_error()); } } if (scf_property_type(prop, &type) != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: default: ret = ECONNABORTED; goto out; case SCF_ERROR_DELETED: action_ts[i] = 0; continue; case SCF_ERROR_NOT_SET: bad_error("scf_property_type", scf_error()); } } if (type != SCF_TYPE_INTEGER) { action_ts[i] = 0; continue; } if (scf_property_get_value(prop, val) != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: default: ret = ECONNABORTED; goto out; case SCF_ERROR_DELETED: goto out; case SCF_ERROR_NOT_FOUND: case SCF_ERROR_CONSTRAINT_VIOLATED: action_ts[i] = 0; continue; case SCF_ERROR_NOT_SET: case SCF_ERROR_PERMISSION_DENIED: bad_error("scf_property_get_value", scf_error()); } } r = scf_value_get_integer(val, &action_ts[i]); assert(r == 0); } a = ADMIN_EVENT_MAINT_ON_IMMEDIATE; if (action_ts[ADMIN_EVENT_MAINT_ON_IMMEDIATE] || action_ts[ADMIN_EVENT_MAINT_ON]) { a = action_ts[ADMIN_EVENT_MAINT_ON_IMMEDIATE] ? ADMIN_EVENT_MAINT_ON_IMMEDIATE : ADMIN_EVENT_MAINT_ON; vertex_send_event(vertex, admin_events[a]); r = libscf_unset_action(h, pg, a, action_ts[a]); switch (r) { case 0: case EACCES: break; case ECONNABORTED: ret = ECONNABORTED; goto out; case EPERM: uu_die("Insufficient privilege.\n"); /* NOTREACHED */ default: bad_error("libscf_unset_action", r); } } while ((a = next_action(action_ts, NACTIONS)) != -1) { log_framework(LOG_DEBUG, "Graph: processing %s action for %s.\n", admin_actions[a], inst_name); if (a == ADMIN_EVENT_REFRESH) { r = dgraph_refresh_instance(vertex, inst); switch (r) { case 0: case ECANCELED: case EINVAL: case -1: break; case ECONNABORTED: /* pg & inst are reset now, so just return. */ ret = ECONNABORTED; goto out; default: bad_error("dgraph_refresh_instance", r); } } vertex_send_event(vertex, admin_events[a]); r = libscf_unset_action(h, pg, a, action_ts[a]); switch (r) { case 0: case EACCES: break; case ECONNABORTED: ret = ECONNABORTED; goto out; case EPERM: uu_die("Insufficient privilege.\n"); /* NOTREACHED */ default: bad_error("libscf_unset_action", r); } action_ts[a] = 0; } out: MUTEX_UNLOCK(&dgraph_lock); scf_property_destroy(prop); scf_value_destroy(val); startd_free(inst_name, max_scf_fmri_size); return (ret); } /* * inst and pg_name are scratch space, and are unset on entry. * Returns * 0 - success * ECONNRESET - success, but repository handle rebound * ECONNABORTED - repository connection broken */ static int process_pg_event(scf_handle_t *h, scf_propertygroup_t *pg, scf_instance_t *inst, char *pg_name) { int r; scf_property_t *prop; scf_value_t *val; char *fmri; boolean_t rebound = B_FALSE, rebind_inst = B_FALSE; if (scf_pg_get_name(pg, pg_name, max_scf_value_size) < 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: default: return (ECONNABORTED); case SCF_ERROR_DELETED: return (0); case SCF_ERROR_NOT_SET: bad_error("scf_pg_get_name", scf_error()); } } if (strcmp(pg_name, SCF_PG_GENERAL) == 0 || strcmp(pg_name, SCF_PG_GENERAL_OVR) == 0) { r = dgraph_update_general(pg); switch (r) { case 0: case ENOTSUP: case ECANCELED: return (0); case ECONNABORTED: return (ECONNABORTED); case -1: /* Error should have been logged. */ return (0); default: bad_error("dgraph_update_general", r); } } else if (strcmp(pg_name, SCF_PG_RESTARTER_ACTIONS) == 0) { if (scf_pg_get_parent_instance(pg, inst) != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: return (ECONNABORTED); case SCF_ERROR_DELETED: case SCF_ERROR_CONSTRAINT_VIOLATED: /* Ignore commands on services. */ return (0); case SCF_ERROR_NOT_BOUND: case SCF_ERROR_HANDLE_MISMATCH: case SCF_ERROR_NOT_SET: default: bad_error("scf_pg_get_parent_instance", scf_error()); } } return (process_actions(h, pg, inst)); } if (strcmp(pg_name, SCF_PG_OPTIONS) != 0 && strcmp(pg_name, SCF_PG_OPTIONS_OVR) != 0) return (0); /* * We only care about the options[_ovr] property groups of our own * instance, so get the fmri and compare. Plus, once we know it's * correct, if the repository connection is broken we know exactly what * property group we were operating on, and can look it up again. */ if (scf_pg_get_parent_instance(pg, inst) != 0) { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: return (ECONNABORTED); case SCF_ERROR_DELETED: case SCF_ERROR_CONSTRAINT_VIOLATED: return (0); case SCF_ERROR_HANDLE_MISMATCH: case SCF_ERROR_NOT_BOUND: case SCF_ERROR_NOT_SET: default: bad_error("scf_pg_get_parent_instance", scf_error()); } } switch (r = libscf_instance_get_fmri(inst, &fmri)) { case 0: break; case ECONNABORTED: return (ECONNABORTED); case ECANCELED: return (0); default: bad_error("libscf_instance_get_fmri", r); } if (strcmp(fmri, SCF_SERVICE_STARTD) != 0) { startd_free(fmri, max_scf_fmri_size); return (0); } prop = safe_scf_property_create(h); val = safe_scf_value_create(h); if (strcmp(pg_name, SCF_PG_OPTIONS_OVR) == 0) { /* See if we need to set the runlevel. */ /* CONSTCOND */ if (0) { rebind_pg: libscf_handle_rebind(h); rebound = B_TRUE; r = libscf_lookup_instance(SCF_SERVICE_STARTD, inst); switch (r) { case 0: break; case ECONNABORTED: goto rebind_pg; case ENOENT: goto out; case EINVAL: case ENOTSUP: bad_error("libscf_lookup_instance", r); } if (scf_instance_get_pg(inst, pg_name, pg) != 0) { switch (scf_error()) { case SCF_ERROR_DELETED: case SCF_ERROR_NOT_FOUND: goto out; case SCF_ERROR_CONNECTION_BROKEN: goto rebind_pg; case SCF_ERROR_HANDLE_MISMATCH: case SCF_ERROR_NOT_BOUND: case SCF_ERROR_NOT_SET: case SCF_ERROR_INVALID_ARGUMENT: default: bad_error("scf_instance_get_pg", scf_error()); } } } if (scf_pg_get_property(pg, "runlevel", prop) == 0) { r = dgraph_set_runlevel(pg, prop); switch (r) { case ECONNRESET: rebound = B_TRUE; rebind_inst = B_TRUE; /* FALLTHROUGH */ case 0: break; case ECONNABORTED: goto rebind_pg; case ECANCELED: goto out; default: bad_error("dgraph_set_runlevel", r); } } else { switch (scf_error()) { case SCF_ERROR_CONNECTION_BROKEN: default: goto rebind_pg; case SCF_ERROR_DELETED: goto out; case SCF_ERROR_NOT_FOUND: break; case SCF_ERROR_INVALID_ARGUMENT: case SCF_ERROR_HANDLE_MISMATCH: case SCF_ERROR_NOT_BOUND: case SCF_ERROR_NOT_SET: bad_error("scf_pg_get_property", scf_error()); } } } if (rebind_inst) { lookup_inst: r = libscf_lookup_instance(SCF_SERVICE_STARTD, inst); switch (r) { case 0: break; case ECONNABORTED: libscf_handle_rebind(h); rebound = B_TRUE; goto lookup_inst; case ENOENT: goto out; case EINVAL: case ENOTSUP: bad_error("libscf_lookup_instance", r); } } r = libscf_get_milestone(inst, prop, val, fmri, max_scf_fmri_size); switch (r) { case 0: break; case ECONNABORTED: libscf_handle_rebind(h); rebound = B_TRUE; goto lookup_inst; case EINVAL: log_error(LOG_NOTICE, "%s/%s property of %s is misconfigured.\n", pg_name, SCF_PROPERTY_MILESTONE, SCF_SERVICE_STARTD); /* FALLTHROUGH */ case ECANCELED: case ENOENT: (void) strcpy(fmri, "all"); break; default: bad_error("libscf_get_milestone", r); } r = dgraph_set_milestone(fmri, h, B_FALSE); switch (r) { case 0: case ECONNRESET: case EALREADY: break; case EINVAL: log_error(LOG_WARNING, "Milestone %s is invalid.\n", fmri); break; case ENOENT: log_error(LOG_WARNING, "Milestone %s does not exist.\n", fmri); break; default: bad_error("dgraph_set_milestone", r); } out: startd_free(fmri, max_scf_fmri_size); scf_value_destroy(val); scf_property_destroy(prop); return (rebound ? ECONNRESET : 0); } /* * process_delete() deletes an instance from the dgraph if 'fmri' is an * instance fmri or if 'fmri' matches the 'general' property group of an * instance (or the 'general/enabled' property). * * 'fmri' may be overwritten and cannot be trusted on return by the caller. */ static void process_delete(char *fmri, scf_handle_t *h) { char *lfmri, *end_inst_fmri; const char *inst_name = NULL; const char *pg_name = NULL; const char *prop_name = NULL; lfmri = safe_strdup(fmri); /* Determine if the FMRI is a property group or instance */ if (scf_parse_svc_fmri(lfmri, NULL, NULL, &inst_name, &pg_name, &prop_name) != SCF_SUCCESS) { log_error(LOG_WARNING, "Received invalid FMRI \"%s\" from repository server.\n", fmri); } else if (inst_name != NULL && pg_name == NULL) { (void) dgraph_remove_instance(fmri, h); } else if (inst_name != NULL && pg_name != NULL) { /* * If we're deleting the 'general' property group or * 'general/enabled' property then the whole instance * must be removed from the dgraph. */ if (strcmp(pg_name, SCF_PG_GENERAL) != 0) { free(lfmri); return; } if (prop_name != NULL && strcmp(prop_name, SCF_PROPERTY_ENABLED) != 0) { free(lfmri); return; } /* * Because the instance has already been deleted from the * repository, we cannot use any scf_ functions to retrieve * the instance FMRI however we can easily reconstruct it * manually. */ end_inst_fmri = strstr(fmri, SCF_FMRI_PROPERTYGRP_PREFIX); if (end_inst_fmri == NULL) bad_error("process_delete", 0); end_inst_fmri[0] = '\0'; (void) dgraph_remove_instance(fmri, h); } free(lfmri); } /*ARGSUSED*/ void * repository_event_thread(void *unused) { scf_handle_t *h; scf_propertygroup_t *pg; scf_instance_t *inst; char *fmri = startd_alloc(max_scf_fmri_size); char *pg_name = startd_alloc(max_scf_value_size); int r; h = libscf_handle_create_bound_loop(); pg = safe_scf_pg_create(h); inst = safe_scf_instance_create(h); retry: if (_scf_notify_add_pgtype(h, SCF_GROUP_FRAMEWORK) != SCF_SUCCESS) { if (scf_error() == SCF_ERROR_CONNECTION_BROKEN) { libscf_handle_rebind(h); } else { log_error(LOG_WARNING, "Couldn't set up repository notification " "for property group type %s: %s\n", SCF_GROUP_FRAMEWORK, scf_strerror(scf_error())); (void) sleep(1); } goto retry; } /*CONSTCOND*/ while (1) { ssize_t res; /* Note: fmri is only set on delete events. */ res = _scf_notify_wait(pg, fmri, max_scf_fmri_size); if (res < 0) { libscf_handle_rebind(h); goto retry; } else if (res == 0) { /* * property group modified. inst and pg_name are * pre-allocated scratch space. */ if (scf_pg_update(pg) < 0) { switch (scf_error()) { case SCF_ERROR_DELETED: continue; case SCF_ERROR_CONNECTION_BROKEN: log_error(LOG_WARNING, "Lost repository event due to " "disconnection.\n"); libscf_handle_rebind(h); goto retry; case SCF_ERROR_NOT_BOUND: case SCF_ERROR_NOT_SET: default: bad_error("scf_pg_update", scf_error()); } } r = process_pg_event(h, pg, inst, pg_name); switch (r) { case 0: break; case ECONNABORTED: log_error(LOG_WARNING, "Lost repository event " "due to disconnection.\n"); libscf_handle_rebind(h); /* FALLTHROUGH */ case ECONNRESET: goto retry; default: bad_error("process_pg_event", r); } } else { /* * Service, instance, or pg deleted. * Don't trust fmri on return. */ process_delete(fmri, h); } } /*NOTREACHED*/ return (NULL); } void graph_engine_start() { int err; (void) startd_thread_create(graph_thread, NULL); MUTEX_LOCK(&dgraph_lock); while (!initial_milestone_set) { err = pthread_cond_wait(&initial_milestone_cv, &dgraph_lock); assert(err == 0); } MUTEX_UNLOCK(&dgraph_lock); (void) startd_thread_create(repository_event_thread, NULL); (void) startd_thread_create(graph_event_thread, NULL); }