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-rw-r--r--src/core/manager.c2
-rw-r--r--src/core/manager.h2
-rw-r--r--src/core/mount.c50
3 files changed, 51 insertions, 3 deletions
diff --git a/src/core/manager.c b/src/core/manager.c
index 3e1728f925..7b2550065d 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -540,7 +540,7 @@ int manager_new(SystemdRunningAs running_as, bool test_run, Manager **_m) {
m->idle_pipe[0] = m->idle_pipe[1] = m->idle_pipe[2] = m->idle_pipe[3] = -1;
- m->pin_cgroupfs_fd = m->notify_fd = m->signal_fd = m->time_change_fd = m->dev_autofs_fd = m->private_listen_fd = m->kdbus_fd = -1;
+ m->pin_cgroupfs_fd = m->notify_fd = m->signal_fd = m->time_change_fd = m->dev_autofs_fd = m->private_listen_fd = m->kdbus_fd = m->utab_inotify_fd = -1;
m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
m->ask_password_inotify_fd = -1;
diff --git a/src/core/manager.h b/src/core/manager.h
index 02535023a3..ab75f902e5 100644
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -182,6 +182,8 @@ struct Manager {
/* Data specific to the mount subsystem */
FILE *proc_self_mountinfo;
sd_event_source *mount_event_source;
+ int utab_inotify_fd;
+ sd_event_source *mount_utab_event_source;
/* Data specific to the swap filesystem */
FILE *proc_swaps;
diff --git a/src/core/mount.c b/src/core/mount.c
index d257925fa7..c961677ff9 100644
--- a/src/core/mount.c
+++ b/src/core/mount.c
@@ -25,6 +25,7 @@
#include <sys/epoll.h>
#include <signal.h>
#include <libmount.h>
+#include <sys/inotify.h>
#include "manager.h"
#include "unit.h"
@@ -1553,11 +1554,13 @@ static void mount_shutdown(Manager *m) {
assert(m);
m->mount_event_source = sd_event_source_unref(m->mount_event_source);
+ m->mount_utab_event_source = sd_event_source_unref(m->mount_utab_event_source);
if (m->proc_self_mountinfo) {
fclose(m->proc_self_mountinfo);
m->proc_self_mountinfo = NULL;
}
+ m->utab_inotify_fd = safe_close(m->utab_inotify_fd);
}
static int mount_get_timeout(Unit *u, uint64_t *timeout) {
@@ -1597,12 +1600,32 @@ static int mount_enumerate(Manager *m) {
goto fail;
}
+ if (m->utab_inotify_fd < 0) {
+ m->utab_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
+ if (m->utab_inotify_fd < 0)
+ goto fail_with_errno;
+
+ r = inotify_add_watch(m->utab_inotify_fd, "/run/mount", IN_MOVED_TO);
+ if (r < 0)
+ goto fail_with_errno;
+
+ r = sd_event_add_io(m->event, &m->mount_utab_event_source, m->utab_inotify_fd, EPOLLIN, mount_dispatch_io, m);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_source_set_priority(m->mount_utab_event_source, -10);
+ if (r < 0)
+ goto fail;
+ }
+
r = mount_load_proc_self_mountinfo(m, false);
if (r < 0)
goto fail;
return 0;
+fail_with_errno:
+ r = -errno;
fail:
mount_shutdown(m);
return r;
@@ -1614,11 +1637,34 @@ static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents,
int r;
assert(m);
- assert(revents & EPOLLPRI);
+ assert(revents & (EPOLLPRI | EPOLLIN));
/* The manager calls this for every fd event happening on the
* /proc/self/mountinfo file, which informs us about mounting
- * table changes */
+ * table changes
+ * This may also be called for /run/mount events */
+
+ if (fd == m->utab_inotify_fd) {
+ char inotify_buffer[sizeof(struct inotify_event) + NAME_MAX + 1];
+ struct inotify_event *event;
+ char *p;
+ int rescan = 0;
+
+ while ((r = read(fd, inotify_buffer, sizeof(inotify_buffer))) > 0) {
+ for (p = inotify_buffer; p < inotify_buffer + r; ) {
+ event = (struct inotify_event *) p;
+ /* only care about changes to utab, but we have
+ * to monitor the directory to reliably get
+ * notifications about when utab is replaced
+ * using rename(2) */
+ if (strcmp(event->name, "utab") == 0)
+ rescan = 1;
+ p += sizeof(struct inotify_event) + event->len;
+ }
+ }
+ if (!rescan)
+ return 0;
+ }
r = mount_load_proc_self_mountinfo(m, true);
if (r < 0) {