freeblock_arg
&(struct freeblock_arg){ .i = 0 });
struct freeblock_arg freeblock_arg = { .blk = 0 };
v7fs_freeblock_foreach(fs, freeblock_subr_cnt, &freeblock_arg);
blk = freeblock_arg.blk;
((struct freeblock_arg *)ctx)->blk++;
struct freeblock_arg *arg = (struct freeblock_arg *)ctx;
struct freeblock_arg *arg = (struct freeblock_arg *)ctx;