tree-wide: port various bits over to open_parent()

src/basic/fileio.c

@@ -1449,22 +1449,14 @@ int open_tmpfile_linkable(const char *target, int flags, char **ret_path) {
          * which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in
          * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */
 
-        {
-                _cleanup_free_ char *dn = NULL;
-
-                dn = dirname_malloc(target);
-                if (!dn)
-                        return -ENOMEM;
-
-                fd = open(dn, O_TMPFILE|flags, 0640);
-                if (fd >= 0) {
-                        *ret_path = NULL;
-                        return fd;
-                }
-
-                log_debug_errno(errno, "Failed to use O_TMPFILE on %s: %m", dn);
+        fd = open_parent(target, O_TMPFILE|flags, 0640);
+        if (fd >= 0) {
+                *ret_path = NULL;
+                return fd;
         }
 
+        log_debug_errno(fd, "Failed to use O_TMPFILE for %s: %m", target);
+
         r = tempfn_random(target, NULL, &tmp);
         if (r < 0)
                 return r;

src/basic/fs-util.c

@@ -1156,7 +1156,7 @@ int unlinkat_deallocate(int fd, const char *name, int flags) {
 }
 
 int fsync_directory_of_file(int fd) {
-        _cleanup_free_ char *path = NULL, *dn = NULL;
+        _cleanup_free_ char *path = NULL;
         _cleanup_close_ int dfd = -1;
         int r;
 
@@ -1182,13 +1182,9 @@ int fsync_directory_of_file(int fd) {
         if (!path_is_absolute(path))
                 return -EINVAL;
 
-        dn = dirname_malloc(path);
-        if (!dn)
-                return -ENOMEM;
-
-        dfd = open(dn, O_RDONLY|O_CLOEXEC|O_DIRECTORY);
+        dfd = open_parent(path, O_CLOEXEC, 0);
         if (dfd < 0)
-                return -errno;
+                return dfd;
 
         if (fsync(dfd) < 0)
                 return -errno;

src/basic/mount-util.c

@@ -261,7 +261,7 @@ fallback_fstat:
 
 /* flags can be AT_SYMLINK_FOLLOW or 0 */
 int path_is_mount_point(const char *t, const char *root, int flags) {
-        _cleanup_free_ char *canonical = NULL, *parent = NULL;
+        _cleanup_free_ char *canonical = NULL;
         _cleanup_close_ int fd = -1;
         int r;
 
@@ -283,11 +283,7 @@ int path_is_mount_point(const char *t, const char *root, int flags) {
                 t = canonical;
         }
 
-        parent = dirname_malloc(t);
-        if (!parent)
-                return -ENOMEM;
-
-        fd = openat(AT_FDCWD, parent, O_DIRECTORY|O_CLOEXEC|O_PATH);
+        fd = open_parent(t, O_PATH|O_CLOEXEC, 0);
         if (fd < 0)
                 return -errno;