tree 4a46a47864031b2a019d6fa605d835a3ca88c539
parent b0afd8e5db7b11aa9078e82e7f9abc30dc35a3c1
author David Jeffery <djeffery@redhat.com> 1412000470 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1414751606 -0400

Return short read or 0 at end of a raw device, not EIO

Author: David Jeffery <djeffery@redhat.com>
Changes to the basic direct I/O code have broken the raw driver when reading
to the end of a raw device.  Instead of returning a short read for a read that
extends partially beyond the device's end or 0 when at the end of the device,
these reads now return EIO.

The raw driver needs the same end of device handling as was added for normal
block devices.  Using blkdev_read_iter, which has the needed size checks,
prevents the EIO conditions at the end of the device.

Signed-off-by: David Jeffery <djeffery@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>