tree 2cb07ecaaaf15389bad53415ecf7c6143f07a9fa
parent 6ff33f3902c3b1c5d0db6b1e2c70b6d76fba357f
author Jeff Moyer <jmoyer@redhat.com> 1439583331 -0400
committer Dan Williams <dan.j.williams@intel.com> 1442362055 -0400

dax: fix O_DIRECT I/O to the last block of a blockdev

commit bbab37ddc20b (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: Jeff Moyer <jmoyer@redhat.com>
Tested-by:  Linda Knippers <linda.knippers@hp.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>