Hi Adam,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.17-rc4 next-20180508]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/adam-manzanares-wdc-com/block-add-ioprio_check_cap-function/20180509-094058
config: x86_64-randconfig-s0-05091255 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   fs/aio.c: In function 'io_submit_one':
>> fs/aio.c:1606:9: error: implicit declaration of function 'ioprio_check_cap' [-Werror=implicit-function-declaration]
      ret = ioprio_check_cap(iocb->aio_reqprio);
            ^~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/ioprio_check_cap +1606 fs/aio.c

  1545	
  1546	static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
  1547				 struct iocb *iocb, bool compat)
  1548	{
  1549		struct aio_kiocb *req;
  1550		struct file *file;
  1551		ssize_t ret;
  1552	
  1553		/* enforce forwards compatibility on users */
  1554		if (unlikely(iocb->aio_reserved2)) {
  1555			pr_debug("EINVAL: reserve field set\n");
  1556			return -EINVAL;
  1557		}
  1558	
  1559		/* prevent overflows */
  1560		if (unlikely(
  1561		    (iocb->aio_buf != (unsigned long)iocb->aio_buf) ||
  1562		    (iocb->aio_nbytes != (size_t)iocb->aio_nbytes) ||
  1563		    ((ssize_t)iocb->aio_nbytes < 0)
  1564		   )) {
  1565			pr_debug("EINVAL: overflow check\n");
  1566			return -EINVAL;
  1567		}
  1568	
  1569		req = aio_get_req(ctx);
  1570		if (unlikely(!req))
  1571			return -EAGAIN;
  1572	
  1573		req->common.ki_filp = file = fget(iocb->aio_fildes);
  1574		if (unlikely(!req->common.ki_filp)) {
  1575			ret = -EBADF;
  1576			goto out_put_req;
  1577		}
  1578		req->common.ki_pos = iocb->aio_offset;
  1579		req->common.ki_complete = aio_complete;
  1580		req->common.ki_flags = iocb_flags(req->common.ki_filp);
  1581		req->common.ki_hint = file_write_hint(file);
  1582	
  1583		if (iocb->aio_flags & IOCB_FLAG_RESFD) {
  1584			/*
  1585			 * If the IOCB_FLAG_RESFD flag of aio_flags is set, get an
  1586			 * instance of the file* now. The file descriptor must be
  1587			 * an eventfd() fd, and will be signaled for each completed
  1588			 * event using the eventfd_signal() function.
  1589			 */
  1590			req->ki_eventfd = eventfd_ctx_fdget((int) iocb->aio_resfd);
  1591			if (IS_ERR(req->ki_eventfd)) {
  1592				ret = PTR_ERR(req->ki_eventfd);
  1593				req->ki_eventfd = NULL;
  1594				goto out_put_req;
  1595			}
  1596	
  1597			req->common.ki_flags |= IOCB_EVENTFD;
  1598		}
  1599	
  1600		if (iocb->aio_flags & IOCB_FLAG_IOPRIO) {
  1601			/*
  1602			 * If the IOCB_FLAG_IOPRIO flag of aio_flags is set, then
  1603			 * aio_reqprio is interpreted as an I/O scheduling
  1604			 * class and priority.
  1605			 */
> 1606			ret = ioprio_check_cap(iocb->aio_reqprio);
  1607			if (ret) {
  1608				pr_debug("aio ioprio check cap error\n");
  1609				goto out_put_req;
  1610			}
  1611	
  1612			req->common.ki_ioprio = iocb->aio_reqprio;
  1613			req->common.ki_flags |= IOCB_IOPRIO;
  1614		}
  1615	
  1616		ret = kiocb_set_rw_flags(&req->common, iocb->aio_rw_flags);
  1617		if (unlikely(ret)) {
  1618			pr_debug("EINVAL: aio_rw_flags\n");
  1619			goto out_put_req;
  1620		}
  1621	
  1622		ret = put_user(KIOCB_KEY, &user_iocb->aio_key);
  1623		if (unlikely(ret)) {
  1624			pr_debug("EFAULT: aio_key\n");
  1625			goto out_put_req;
  1626		}
  1627	
  1628		req->ki_user_iocb = user_iocb;
  1629		req->ki_user_data = iocb->aio_data;
  1630	
  1631		get_file(file);
  1632		switch (iocb->aio_lio_opcode) {
  1633		case IOCB_CMD_PREAD:
  1634			ret = aio_read(&req->common, iocb, false, compat);
  1635			break;
  1636		case IOCB_CMD_PWRITE:
  1637			ret = aio_write(&req->common, iocb, false, compat);
  1638			break;
  1639		case IOCB_CMD_PREADV:
  1640			ret = aio_read(&req->common, iocb, true, compat);
  1641			break;
  1642		case IOCB_CMD_PWRITEV:
  1643			ret = aio_write(&req->common, iocb, true, compat);
  1644			break;
  1645		default:
  1646			pr_debug("invalid aio operation %d\n", iocb->aio_lio_opcode);
  1647			ret = -EINVAL;
  1648			break;
  1649		}
  1650		fput(file);
  1651	
  1652		if (ret && ret != -EIOCBQUEUED)
  1653			goto out_put_req;
  1654		return 0;
  1655	out_put_req:
  1656		put_reqs_available(ctx, 1);
  1657		percpu_ref_put(&ctx->reqs);
  1658		kiocb_free(req);
  1659		return ret;
  1660	}
  1661	

---
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