fs-util: introduce inotify_add_watch_and_warn() helper

The default message for ENOSPC is very misleading: it says that the disk is
filled, but in fact the inotify watch limit is the problem.

So let's introduce and use a wrapper that simply calls inotify_add_watch(2) and
which fixes the error message up in case ENOSPC is returned.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/time-wait-sync/time-wait-sync.c b/src/time-wait-sync/time-wait-sync.c
index f4d20af2d4..5b27df1f9e 100644
--- a/src/time-wait-sync/time-wait-sync.c
+++ b/src/time-wait-sync/time-wait-sync.c
@@ -225,9 +225,9 @@ static int run(int argc, char * argv[]) {
         if (r < 0)
                 return log_error_errno(r, "Failed to create notify event source: %m");
 
-        r = inotify_add_watch(state.inotify_fd, "/run/systemd/", IN_CREATE);
+        r = inotify_add_watch_and_warn(state.inotify_fd, "/run/systemd/", IN_CREATE);
         if (r < 0)
-                return log_error_errno(errno, "Failed to watch /run/systemd/: %m");
+                return r;
 
         state.run_systemd_wd = r;