static void cusexmp_ioctl(fuse_req_t req, int cmd, void *arg, struct fuse_file_info *fi, unsigned flags, const void *in_buf, size_t in_bufsz, size_t out_bufsz) { int is_read = 0; (void)fi; if (flags & FUSE_IOCTL_COMPAT) { fuse_reply_err(req, ENOSYS); return; } switch (cmd) { case FIOC_GET_SIZE: if (!out_bufsz) { struct iovec iov = { arg, sizeof(size_t) }; fuse_reply_ioctl_retry(req, NULL, 0, &iov, 1); } else fuse_reply_ioctl(req, 0, &cusexmp_size, sizeof(cusexmp_size)); break; case FIOC_SET_SIZE: if (!in_bufsz) { struct iovec iov = { arg, sizeof(size_t) }; fuse_reply_ioctl_retry(req, &iov, 1, NULL, 0); } else { cusexmp_resize(*(size_t *)in_buf); fuse_reply_ioctl(req, 0, NULL, 0); } break; case FIOC_READ: is_read = 1; /* no break */ case FIOC_WRITE: fioc_do_rw(req, arg, in_buf, in_bufsz, out_bufsz, is_read); break; default: fuse_reply_err(req, EINVAL); } }
static int cusexmp_expand(size_t new_size) { if (new_size > cusexmp_size) return cusexmp_resize(new_size); return 0; }