fs/overlayfs/readdir.c

242 static void ovl_cache_put(struct ovl_dir_file *od, struct inode *inode)
244 	struct ovl_dir_cache *cache = od->cache;
328 	struct ovl_dir_file *od = file->private_data;
329 	struct ovl_dir_cache *cache = od->cache;
334 		ovl_cache_put(od, inode);
335 		od->cache = NULL;
336 		od->cursor = NULL;
339 	if (od->is_real != is_real) {
343 		od->is_real = false;
386 static void ovl_seek_cursor(struct ovl_dir_file *od, loff_t pos)
391 	list_for_each(p, &od->cache->entries) {
397 	od->cursor = p;
694 	struct ovl_dir_file *od = file->private_data;
703 	return od->is_upper && ovl_test_flag(OVL_IMPURE, dir);
710 	struct ovl_dir_file *od = file->private_data;
743 	err = iterate_dir(od->realfile, &rdt.ctx);
752 	struct ovl_dir_file *od = file->private_data;
763 	if (od->is_real) {
775 			err = iterate_dir(od->realfile, ctx);
780 	if (!od->cache) {
788 		od->cache = cache;
789 		ovl_seek_cursor(od, ctx->pos);
792 	while (od->cursor != &od->cache->entries) {
793 		p = list_entry(od->cursor, struct ovl_cache_entry, l_node);
806 		od->cursor = p->l_node.next;
818 	struct ovl_dir_file *od = file->private_data;
824 	if (od->is_real) {
825 		res = vfs_llseek(od->realfile, offset, origin);
826 		file->f_pos = od->realfile->f_pos;
844 			if (od->cache)
845 				ovl_seek_cursor(od, offset);
878 	struct ovl_dir_file *od = file->private_data;
880 	struct file *old, *realfile = od->realfile;
888 	if (!od->is_upper) {
889 		realfile = READ_ONCE(od->upperfile);
898 			old = cmpxchg_release(&od->upperfile, NULL, realfile);
931 	struct ovl_dir_file *od = file->private_data;
933 	if (od->cache) {
935 		ovl_cache_put(od, inode);
938 	fput(od->realfile);
939 	if (od->upperfile)
940 		fput(od->upperfile);
941 	kfree(od);
950 	struct ovl_dir_file *od;
953 	od = kzalloc(sizeof(struct ovl_dir_file), GFP_KERNEL);
954 	if (!od)
960 		kfree(od);
963 	od->realfile = realfile;
964 	od->is_real = ovl_dir_is_real(inode);
965 	od->is_upper = OVL_TYPE_UPPER(type);
966 	file->private_data = od;