dax: fix O_DIRECT I/O to the last block of a blockdev
commit bbab37dd (block: Add support for DAX reads/writes to block devices) caused a regression in mkfs.xfs. That utility sets the block size of the device to the logical block size using the BLKBSZSET ioctl, and then issues a single sector read from the last sector of the device. This results in the dax_io code trying to do a page-sized read from 512 bytes from the end of the device. The result is -ERANGE being returned to userspace. The fix is to align the block to the page size before calling get_block. Thanks to willy for simplifying my original patch. Cc: <stable@vger.kernel.org> Signed-off-by: NJeff Moyer <jmoyer@redhat.com> Tested-by: NLinda Knippers <linda.knippers@hp.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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