tree-wide: make use of fsync_directory_of_file() all over the place

Let's make use this at various places we call fsync(), to make things
fully reliable, as the kernel devs suggest to first fsync() files and
then fsync() the directories they are located in.

src/basic/fileio.c

@@ -1187,6 +1187,10 @@ int fflush_sync_and_check(FILE *f) {
         if (fsync(fileno(f)) < 0)
                 return -errno;
 
+        r = fsync_directory_of_file(fileno(f));
+        if (r < 0)
+                return r;
+
         return 0;
 }
 

src/boot/bootctl.c

@@ -434,12 +434,13 @@ static int copy_file_with_version_check(const char *from, const char *to, bool f
 
         (void) copy_times(fd_from, fd_to);
 
-        r = fsync(fd_to);
-        if (r < 0) {
+        if (fsync(fd_to) < 0) {
                 (void) unlink_noerrno(t);
                 return log_error_errno(errno, "Failed to copy data from \"%s\" to \"%s\": %m", from, t);
         }
 
+        (void) fsync_directory_of_file(fd_to);
+
         r = renameat(AT_FDCWD, t, AT_FDCWD, to);
         if (r < 0) {
                 (void) unlink_noerrno(t);

src/coredump/coredump.c

@@ -260,6 +260,8 @@ static int fix_permissions(
         if (fsync(fd) < 0)
                 return log_error_errno(errno, "Failed to sync coredump %s: %m", coredump_tmpfile_name(filename));
 
+        (void) fsync_directory_of_file(fd);
+
         r = link_tmpfile(fd, filename, target);
         if (r < 0)
                 return log_error_errno(r, "Failed to move coredump %s into place: %m", target);

src/libsystemd/sd-id128/id128-util.c

@@ -23,6 +23,7 @@
 #include <unistd.h>
 
 #include "fd-util.h"
+#include "fs-util.h"
 #include "hexdecoct.h"
 #include "id128-util.h"
 #include "io-util.h"
@@ -180,9 +181,13 @@ int id128_write_fd(int fd, Id128Format f, sd_id128_t id, bool do_sync) {
         if (do_sync) {
                 if (fsync(fd) < 0)
                         return -errno;
+
+                r = fsync_directory_of_file(fd);
+                if (r < 0)
+                        return r;
         }
 
-        return r;
+        return 0;
 }
 
 int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync) {