X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fudev%2Fudevd.c;h=8ad1eccac14a573eef077bdc844d64a3053248db;hp=fc33ff01170b7878a3e0e40479f7e68011b65d7a;hb=d315bba6f6c9d929acdbf3c37cbcf6c9a72365ac;hpb=04a9d3a00a9290cbf254d0b0ba2ce4521be632ae diff --git a/src/udev/udevd.c b/src/udev/udevd.c index fc33ff011..8ad1eccac 100644 --- a/src/udev/udevd.c +++ b/src/udev/udevd.c @@ -46,6 +46,8 @@ #include "udev.h" #include "sd-daemon.h" +#include "cgroup-util.h" +#include "dev-setup.h" static bool debug; @@ -72,6 +74,7 @@ static int exec_delay; static sigset_t sigmask_orig; static UDEV_LIST(event_list); static UDEV_LIST(worker_list); +char *udev_cgroup; static bool udev_exit; enum event_state { @@ -96,13 +99,9 @@ struct event { int ifindex; }; -static struct event *node_to_event(struct udev_list_node *node) +static inline struct event *node_to_event(struct udev_list_node *node) { - char *event; - - event = (char *)node; - event -= offsetof(struct event, node); - return (struct event *)event; + return container_of(node, struct event, node); } static void event_queue_cleanup(struct udev *udev, enum event_state type); @@ -131,13 +130,9 @@ struct worker_message { int exitcode; }; -static struct worker *node_to_worker(struct udev_list_node *node) +static inline struct worker *node_to_worker(struct udev_list_node *node) { - char *worker; - - worker = (char *)node; - worker -= offsetof(struct worker, node); - return (struct worker *)worker; + return container_of(node, struct worker, node); } static void event_queue_delete(struct event *event, bool export) @@ -325,11 +320,10 @@ static void worker_new(struct event *event) int fdcount; int i; - fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), -1); + fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); if (fdcount < 0) { if (errno == EINTR) continue; - err = -errno; log_error("failed to poll: %m\n"); goto out; } @@ -453,22 +447,13 @@ static int event_queue_insert(struct udev_device *dev) return 0; } -static void worker_kill(struct udev *udev, int retain) +static void worker_kill(struct udev *udev) { struct udev_list_node *loop; - int max; - - if (children <= retain) - return; - - max = children - retain; udev_list_node_foreach(loop, &worker_list) { struct worker *worker = node_to_worker(loop); - if (max-- <= 0) - break; - if (worker->state == WORKER_KILLED) continue; @@ -636,7 +621,7 @@ static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl) log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i); log_set_max_level(i); udev_set_log_priority(udev, i); - worker_kill(udev, 0); + worker_kill(udev); } if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { @@ -678,7 +663,7 @@ static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl) } free(key); } - worker_kill(udev, 0); + worker_kill(udev); } i = udev_ctrl_get_set_children_max(ctrl_msg); @@ -864,53 +849,18 @@ static void static_dev_create_from_modules(struct udev *udev) else continue; - util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/", devname, NULL); - util_create_path_selinux(udev, filename); - udev_selinux_setfscreatecon(udev, filename, mode); + util_strscpyl(filename, sizeof(filename), "/dev/", devname, NULL); + mkdir_parents_label(filename, 0755); + label_context_set(filename, mode); log_debug("mknod '%s' %c%u:%u\n", filename, type, maj, min); if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST) utimensat(AT_FDCWD, filename, NULL, 0); - udev_selinux_resetfscreatecon(udev); + label_context_clear(); } fclose(f); } -/* needed for standalone udev operations */ -static void static_dev_create_links(struct udev *udev) -{ - DIR *dir; - struct stdlinks { - const char *link; - const char *target; - }; - static const struct stdlinks stdlinks[] = { - { "core", "/proc/kcore" }, - { "fd", "/proc/self/fd" }, - { "stdin", "/proc/self/fd/0" }, - { "stdout", "/proc/self/fd/1" }, - { "stderr", "/proc/self/fd/2" }, - }; - unsigned int i; - - dir = opendir(udev_get_dev_path(udev)); - if (dir == NULL) - return; - - for (i = 0; i < ARRAY_SIZE(stdlinks); i++) { - struct stat sb; - - if (stat(stdlinks[i].target, &sb) == 0) { - udev_selinux_setfscreateconat(udev, dirfd(dir), stdlinks[i].link, S_IFLNK); - if (symlinkat(stdlinks[i].target, dirfd(dir), stdlinks[i].link) < 0 && errno == EEXIST) - utimensat(dirfd(dir), stdlinks[i].link, NULL, AT_SYMLINK_NOFOLLOW); - udev_selinux_resetfscreatecon(udev); - } - } - - closedir(dir); -} - static int mem_size_mb(void) { FILE *f; @@ -942,16 +892,15 @@ static int convert_db(struct udev *udev) struct udev_list_entry *list_entry; /* current database */ - util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data", NULL); - if (access(filename, F_OK) >= 0) + if (access("/run/udev/data", F_OK) >= 0) return 0; /* make sure we do not get here again */ - util_create_path(udev, filename); + mkdir_parents("/run/udev/data", 0755); mkdir(filename, 0755); /* old database */ - util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db", NULL); + util_strscpyl(filename, sizeof(filename), "/dev/.udev/db", NULL); if (access(filename, F_OK) < 0) return 0; @@ -984,7 +933,7 @@ static int convert_db(struct udev *udev) /* find database in old location */ id = udev_device_get_id_filename(device); - util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), "/.udev/db/", id, NULL); + util_strscpyl(from, sizeof(from), "/dev/.udev/db/", id, NULL); if (lstat(from, &stats) == 0) { if (!have_db) { udev_device_read_db(device, from); @@ -994,9 +943,8 @@ static int convert_db(struct udev *udev) } /* find old database with $subsys:$sysname name */ - util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), - "/.udev/db/", udev_device_get_subsystem(device), ":", - udev_device_get_sysname(device), NULL); + util_strscpyl(from, sizeof(from), "/dev/.udev/db/", + udev_device_get_subsystem(device), ":", udev_device_get_sysname(device), NULL); if (lstat(from, &stats) == 0) { if (!have_db) { udev_device_read_db(device, from); @@ -1007,7 +955,7 @@ static int convert_db(struct udev *udev) /* find old database with the encoded devpath name */ util_path_encode(udev_device_get_devpath(device), devpath, sizeof(devpath)); - util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), "/.udev/db/", devpath, NULL); + util_strscpyl(from, sizeof(from), "/dev/.udev/db/", devpath, NULL); if (lstat(from, &stats) == 0) { if (!have_db) { udev_device_read_db(device, from); @@ -1062,36 +1010,6 @@ static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink) return 0; } -static bool check_rules_timestamp(struct udev *udev) -{ - char **p; - unsigned long long *stamp_usec; - int i, n; - bool changed = false; - - n = udev_get_rules_path(udev, &p, &stamp_usec); - for (i = 0; i < n; i++) { - struct stat stats; - - if (stat(p[i], &stats) < 0) - continue; - - if (stamp_usec[i] == ts_usec(&stats.st_mtim)) - continue; - - /* first check */ - if (stamp_usec[i] != 0) { - log_debug("reload - timestamp of '%s' changed\n", p[i]); - changed = true; - } - - /* update timestamp */ - stamp_usec[i] = ts_usec(&stats.st_mtim); - } - - return changed; -} - int main(int argc, char *argv[]) { struct udev *udev; @@ -1124,7 +1042,7 @@ int main(int argc, char *argv[]) log_parse_environment(); udev_set_log_fn(udev, udev_main_log); log_debug("version %s\n", VERSION); - udev_selinux_init(udev); + label_init("/dev"); for (;;) { int option; @@ -1145,8 +1063,8 @@ int main(int argc, char *argv[]) break; case 'D': debug = true; - if (udev_get_log_priority(udev) < LOG_INFO) - udev_set_log_priority(udev, LOG_INFO); + log_set_max_level(LOG_DEBUG); + udev_set_log_priority(udev, LOG_INFO); break; case 'N': if (strcmp (optarg, "early") == 0) { @@ -1224,11 +1142,9 @@ int main(int argc, char *argv[]) chdir("/"); umask(022); - /* /run/udev */ - mkdir(udev_get_run_path(udev), 0755); + mkdir("/run/udev", 0755); - /* create standard links, copy static nodes, create nodes from modules */ - static_dev_create_links(udev); + dev_setup(); static_dev_create_from_modules(udev); /* before opening new files, make sure std{in,out,err} fds are in a sane state */ @@ -1264,6 +1180,10 @@ int main(int argc, char *argv[]) rc = 3; goto exit; } + + /* get our own cgroup, we regularly kill everything udev has left behind */ + if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0) + udev_cgroup = NULL; } else { /* open control and netlink socket */ udev_ctrl = udev_ctrl_new(udev); @@ -1327,18 +1247,8 @@ int main(int argc, char *argv[]) setsid(); - fd = open("/proc/self/oom_score_adj", O_RDWR); - if (fd < 0) { - /* Fallback to old interface */ - fd = open("/proc/self/oom_adj", O_RDWR); - if (fd < 0) { - log_error("error disabling OOM: %m\n"); - } else { - /* OOM_DISABLE == -17 */ - write(fd, "-17", 3); - close(fd); - } - } else { + fd = open("/proc/self/oom_score_adj", O_RDWR|O_CLOEXEC); + if (fd >= 0) { write(fd, "-1000", 5); close(fd); } @@ -1443,9 +1353,9 @@ int main(int argc, char *argv[]) /* set value depending on the amount of RAM */ if (memsize > 0) - children_max = 128 + (memsize / 8); + children_max = 16 + (memsize / 8); else - children_max = 128; + children_max = 16; } log_debug("set children_max to %u\n", children_max); @@ -1481,7 +1391,7 @@ int main(int argc, char *argv[]) /* discard queued events and kill workers */ event_queue_cleanup(udev, EVENT_QUEUED); - worker_kill(udev, 0); + worker_kill(udev); /* exit after all has cleaned up */ if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list)) @@ -1489,14 +1399,18 @@ int main(int argc, char *argv[]) /* timeout at exit for workers to finish */ timeout = 30 * 1000; - } else if (udev_list_node_is_empty(&event_list) && children <= 2) { + } else if (udev_list_node_is_empty(&event_list) && !children) { /* we are idle */ timeout = -1; + + /* cleanup possible left-over processes in our cgroup */ + if (udev_cgroup) + cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL); } else { /* kill idle or hanging workers */ timeout = 3 * 1000; } - fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout); + fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout); if (fdcount < 0) continue; @@ -1512,7 +1426,7 @@ int main(int argc, char *argv[]) /* kill idle workers */ if (udev_list_node_is_empty(&event_list)) { log_debug("cleanup idle workers\n"); - worker_kill(udev, 2); + worker_kill(udev); } /* check for hanging events */ @@ -1557,7 +1471,7 @@ int main(int argc, char *argv[]) /* check for changed config, every 3 seconds at most */ if ((now_usec() - last_usec) > 3 * 1000 * 1000) { - if (check_rules_timestamp(udev)) + if (udev_rules_check_timestamp(rules)) reload = true; if (udev_builtin_validate(udev)) reload = true; @@ -1567,7 +1481,7 @@ int main(int argc, char *argv[]) /* reload requested, HUP signal received, rules changed, builtin changed */ if (reload) { - worker_kill(udev, 0); + worker_kill(udev); rules = udev_rules_unref(rules); udev_builtin_exit(udev); reload = 0; @@ -1647,7 +1561,7 @@ exit_daemonize: udev_queue_export_unref(udev_queue_export); udev_ctrl_connection_unref(ctrl_conn); udev_ctrl_unref(udev_ctrl); - udev_selinux_exit(udev); + label_finish(); udev_unref(udev); log_close(); return rc;