#include <time.h>
#include <getopt.h>
#include <dirent.h>
+#include <sys/file.h>
#include <sys/time.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/signalfd.h>
#include <sys/epoll.h>
+#include <sys/mount.h>
#include <sys/poll.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include "udev.h"
+#include "udev-util.h"
#include "sd-daemon.h"
#include "cgroup-util.h"
#include "dev-setup.h"
}
static struct udev_rules *rules;
-static struct udev_queue_export *udev_queue_export;
static struct udev_ctrl *udev_ctrl;
static struct udev_monitor *monitor;
static int worker_watch[2] = { -1, -1 };
return container_of(node, struct worker, node);
}
-static void event_queue_delete(struct event *event, bool export)
+static void event_queue_delete(struct event *event)
{
udev_list_node_remove(&event->node);
-
- if (export) {
- udev_queue_export_device_finished(udev_queue_export, event->dev);
- log_debug("seq %llu done with %i", udev_device_get_seqnum(event->dev), event->exitcode);
- }
udev_device_unref(event->dev);
free(event);
}
udev_monitor_allow_unicast_sender(worker_monitor, monitor);
udev_monitor_enable_receiving(worker_monitor);
- worker = calloc(1, sizeof(struct worker));
+ worker = new0(struct worker, 1);
if (worker == NULL) {
udev_monitor_unref(worker_monitor);
return;
free(worker);
worker_list_cleanup(udev);
event_queue_cleanup(udev, EVENT_UNDEF);
- udev_queue_export_unref(udev_queue_export);
udev_monitor_unref(monitor);
udev_ctrl_unref(udev_ctrl);
close(fd_signal);
goto out;
}
- memset(&ep_signal, 0, sizeof(struct epoll_event));
+ memzero(&ep_signal, sizeof(struct epoll_event));
ep_signal.events = EPOLLIN;
ep_signal.data.fd = fd_signal;
fd_monitor = udev_monitor_get_fd(worker_monitor);
- memset(&ep_monitor, 0, sizeof(struct epoll_event));
+ memzero(&ep_monitor, sizeof(struct epoll_event));
ep_monitor.events = EPOLLIN;
ep_monitor.data.fd = fd_monitor;
for (;;) {
struct udev_event *udev_event;
struct worker_message msg;
- int err;
+ int fd_lock = -1;
+ int err = 0;
log_debug("seq %llu running", udev_device_get_seqnum(dev));
udev_event = udev_event_new(dev);
if (exec_delay > 0)
udev_event->exec_delay = exec_delay;
+ /*
+ * Take a "read lock" on the device node; this establishes
+ * a concept of device "ownership" to serialize device
+ * access. External processes holding a "write lock" will
+ * cause udev to skip the event handling; in the case udev
+ * acquired the lock, the external process will block until
+ * udev has finished its event handling.
+ */
+
+ /*
+ * <kabi_> since we make check - device seems unused - we try
+ * ioctl to deactivate - and device is found to be opened
+ * <kay> sure, you try to take a write lock
+ * <kay> if you get it udev is out
+ * <kay> if you can't get it, udev is busy
+ * <kabi_> we cannot deactivate openned device (as it is in-use)
+ * <kay> maybe we should just exclude dm from that thing entirely
+ * <kabi_> IMHO this sounds like a good plan for this moment
+ */
+ if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
+ !startswith("dm-", udev_device_get_sysname(dev))) {
+ struct udev_device *d = dev;
+
+ if (streq_ptr("partition", udev_device_get_devtype(d)))
+ d = udev_device_get_parent(d);
+
+ if (d) {
+ fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
+ if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) {
+ log_debug("Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d));
+ err = -EWOULDBLOCK;
+ fd_lock = safe_close(fd_lock);
+ goto skip;
+ }
+ }
+ }
+
/* apply rules, create node, symlinks */
- err = udev_event_execute_rules(udev_event, rules, &sigmask_orig);
+ udev_event_execute_rules(udev_event, rules, &sigmask_orig);
- if (err == 0)
- udev_event_execute_run(udev_event, &sigmask_orig);
+ udev_event_execute_run(udev_event, &sigmask_orig);
/* apply/restore inotify watch */
- if (err == 0 && udev_event->inotify_watch) {
+ if (udev_event->inotify_watch) {
udev_watch_begin(udev, dev);
udev_device_update_db(dev);
}
+ safe_close(fd_lock);
+
/* send processed event back to libudev listeners */
udev_monitor_send_device(worker_monitor, NULL, dev);
+skip:
/* send udevd the result of the event execution */
- memset(&msg, 0, sizeof(struct worker_message));
- if (err != 0)
- msg.exitcode = err;
+ memzero(&msg, sizeof(struct worker_message));
+ msg.exitcode = err;
msg.pid = getpid();
send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
}
out:
udev_device_unref(dev);
- if (fd_signal >= 0)
- close(fd_signal);
- if (fd_ep >= 0)
- close(fd_ep);
+ safe_close(fd_signal);
+ safe_close(fd_ep);
close(fd_inotify);
close(worker_watch[WRITE_END]);
udev_rules_unref(rules);
{
struct event *event;
- event = calloc(1, sizeof(struct event));
+ event = new0(struct event, 1);
if (event == NULL)
return -1;
event->nodelay = true;
#endif
- udev_queue_export_device_queued(udev_queue_export, dev);
log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
udev_device_get_action(dev), udev_device_get_subsystem(dev));
if (match_type != EVENT_UNDEF && match_type != event->state)
continue;
- event_queue_delete(event, false);
+ event_queue_delete(event);
}
}
/* worker returned */
if (worker->event) {
worker->event->exitcode = msg.exitcode;
- event_queue_delete(worker->event, true);
+ event_queue_delete(worker->event);
worker->event = NULL;
}
if (worker->state != WORKER_KILLED)
i = udev_ctrl_get_set_log_level(ctrl_msg);
if (i >= 0) {
- log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i", i);
+ log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i);
log_set_max_level(i);
udev_set_log_priority(udev, i);
worker_kill(udev);
return udev_ctrl_connection_unref(ctrl_conn);
}
-/* read inotify messages */
+static int synthesize_change(struct udev_device *dev) {
+ char filename[UTIL_PATH_SIZE];
+ int r;
+
+ if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
+ streq_ptr("disk", udev_device_get_devtype(dev)) &&
+ !startswith("dm-", udev_device_get_sysname(dev))) {
+ bool part_table_read = false;
+ bool has_partitions = false;
+ int fd;
+ struct udev *udev = udev_device_get_udev(dev);
+ _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
+ struct udev_list_entry *item;
+
+ /*
+ * Try to re-read the partition table. This only succeeds if
+ * none of the devices is busy. The kernel returns 0 if no
+ * partition table is found, and we will not get an event for
+ * the disk.
+ */
+ fd = open(udev_device_get_devnode(dev), O_RDONLY|O_EXCL|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
+ if (fd >= 0) {
+ r = ioctl(fd, BLKRRPART, 0);
+ close(fd);
+ if (r >= 0)
+ part_table_read = true;
+ }
+
+ /* search for partitions */
+ e = udev_enumerate_new(udev);
+ if (!e)
+ return -ENOMEM;
+
+ r = udev_enumerate_add_match_parent(e, dev);
+ if (r < 0)
+ return r;
+
+ r = udev_enumerate_add_match_subsystem(e, "block");
+ if (r < 0)
+ return r;
+
+ r = udev_enumerate_scan_devices(e);
+
+ udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
+ _cleanup_udev_device_unref_ struct udev_device *d = NULL;
+
+ d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
+ if (!d)
+ continue;
+
+ if (!streq_ptr("partition", udev_device_get_devtype(d)))
+ continue;
+
+ has_partitions = true;
+ break;
+ }
+
+ /*
+ * We have partitions and re-read the table, the kernel already sent
+ * out a "change" event for the disk, and "remove/add" for all
+ * partitions.
+ */
+ if (part_table_read && has_partitions)
+ return 0;
+
+ /*
+ * We have partitions but re-reading the partition table did not
+ * work, synthesize "change" for the disk and all partitions.
+ */
+ log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
+ strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
+ write_string_file(filename, "change");
+
+ udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
+ _cleanup_udev_device_unref_ struct udev_device *d = NULL;
+
+ d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
+ if (!d)
+ continue;
+
+ if (!streq_ptr("partition", udev_device_get_devtype(d)))
+ continue;
+
+ log_debug("device %s closed, synthesising partition '%s' 'change'",
+ udev_device_get_devnode(dev), udev_device_get_devnode(d));
+ strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL);
+ write_string_file(filename, "change");
+ }
+
+ return 0;
+ }
+
+ log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
+ strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
+ write_string_file(filename, "change");
+
+ return 0;
+}
+
static int handle_inotify(struct udev *udev)
{
int nbytes, pos;
char *buf;
struct inotify_event *ev;
+ int r;
- if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
- return 0;
+ r = ioctl(fd_inotify, FIONREAD, &nbytes);
+ if (r < 0 || nbytes <= 0)
+ return -errno;
buf = malloc(nbytes);
- if (buf == NULL) {
+ if (!buf) {
log_error("error getting buffer for inotify");
- return -1;
+ return -ENOMEM;
}
nbytes = read(fd_inotify, buf, nbytes);
ev = (struct inotify_event *)(buf + pos);
dev = udev_watch_lookup(udev, ev->wd);
- if (dev != NULL) {
- log_debug("inotify event: %x for %s", ev->mask, udev_device_get_devnode(dev));
- if (ev->mask & IN_CLOSE_WRITE) {
- char filename[UTIL_PATH_SIZE];
- int fd;
-
- log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
- strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
- fd = open(filename, O_WRONLY);
- if (fd >= 0) {
- if (write(fd, "change", 6) < 0)
- log_debug("error writing uevent: %m");
- close(fd);
- }
- }
- if (ev->mask & IN_IGNORED)
- udev_watch_end(udev, dev);
+ if (!dev)
+ continue;
- udev_device_unref(dev);
- }
+ log_debug("inotify event: %x for %s", ev->mask, udev_device_get_devnode(dev));
+ if (ev->mask & IN_CLOSE_WRITE)
+ synthesize_change(dev);
+ else if (ev->mask & IN_IGNORED)
+ udev_watch_end(udev, dev);
+ udev_device_unref(dev);
}
free(buf);
log_error("worker [%u] failed while handling '%s'",
pid, worker->event->devpath);
worker->event->exitcode = -32;
- event_queue_delete(worker->event, true);
+ event_queue_delete(worker->event);
+
/* drop reference taken for state 'running' */
worker_unref(worker);
}
goto exit;
}
- udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
-
- /* create queue file before signalling 'ready', to make sure we block 'settle' */
- udev_queue_export = udev_queue_export_new(udev);
- if (udev_queue_export == NULL) {
- log_error("error creating queue file");
- goto exit;
- }
+ udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
if (daemonize) {
pid_t pid;
goto exit;
}
- memset(&ep_ctrl, 0, sizeof(struct epoll_event));
+ memzero(&ep_ctrl, sizeof(struct epoll_event));
ep_ctrl.events = EPOLLIN;
ep_ctrl.data.fd = fd_ctrl;
- memset(&ep_inotify, 0, sizeof(struct epoll_event));
+ memzero(&ep_inotify, sizeof(struct epoll_event));
ep_inotify.events = EPOLLIN;
ep_inotify.data.fd = fd_inotify;
- memset(&ep_signal, 0, sizeof(struct epoll_event));
+ memzero(&ep_signal, sizeof(struct epoll_event));
ep_signal.events = EPOLLIN;
ep_signal.data.fd = fd_signal;
- memset(&ep_netlink, 0, sizeof(struct epoll_event));
+ memzero(&ep_netlink, sizeof(struct epoll_event));
ep_netlink.events = EPOLLIN;
ep_netlink.data.fd = fd_netlink;
- memset(&ep_worker, 0, sizeof(struct epoll_event));
+ memzero(&ep_worker, sizeof(struct epoll_event));
ep_worker.events = EPOLLIN;
ep_worker.data.fd = fd_worker;
worker_kill(udev);
/* exit after all has cleaned up */
- if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list))
+ if (udev_list_node_is_empty(&event_list) && children == 0)
break;
/* timeout at exit for workers to finish */
- timeout = 30 * 1000;
- } else if (udev_list_node_is_empty(&event_list) && !children) {
+ timeout = 30 * MSEC_PER_SEC;
+ } else if (udev_list_node_is_empty(&event_list) && children == 0) {
/* we are idle */
timeout = -1;
cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
} else {
/* kill idle or hanging workers */
- timeout = 3 * 1000;
+ timeout = 3 * MSEC_PER_SEC;
+ }
+
+ /* tell settle that we are busy or idle */
+ if (!udev_list_node_is_empty(&event_list)) {
+ int fd;
+
+ fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
+ if (fd >= 0)
+ close(fd);
+ } else {
+ unlink("/run/udev/queue");
}
+
fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
if (fdcount < 0)
continue;
if (worker->state != WORKER_RUNNING)
continue;
- if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * 1000 * 1000) {
+ if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * USEC_PER_SEC) {
log_error("worker [%u] %s timeout; kill it", worker->pid,
worker->event ? worker->event->devpath : "<idle>");
kill(worker->pid, SIGKILL);
worker->state = WORKER_KILLED;
+
/* drop reference taken for state 'running' */
worker_unref(worker);
if (worker->event) {
- log_error("seq %llu '%s' killed",
- udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
+ log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
worker->event->exitcode = -64;
- event_queue_delete(worker->event, true);
+ event_queue_delete(worker->event);
worker->event = NULL;
}
}
}
/* check for changed config, every 3 seconds at most */
- if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * 1000 * 1000) {
+ if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
if (udev_rules_check_timestamp(rules))
reload = true;
if (udev_builtin_validate(udev))
rc = EXIT_SUCCESS;
exit:
- udev_queue_export_cleanup(udev_queue_export);
udev_ctrl_cleanup(udev_ctrl);
+ unlink("/run/udev/queue");
exit_daemonize:
if (fd_ep >= 0)
close(fd_ep);
if (worker_watch[WRITE_END] >= 0)
close(worker_watch[WRITE_END]);
udev_monitor_unref(monitor);
- udev_queue_export_unref(udev_queue_export);
udev_ctrl_connection_unref(ctrl_conn);
udev_ctrl_unref(udev_ctrl);
label_finish();
~ianmdlvl / elogind.git / blobdiff