tree 2bcfbc9028d5a92875272302bd9e7daf82b4e4be
parent f75b1b1bedfb498cc43a992ce4d7ed8df3b1e770
author Richard Weinberger <richard@nod.at> 1376825406 +0200
committer Richard Weinberger <richard@nod.at> 1378544209 +0200

um: ubd: Add REQ_FLUSH suppport

UML's block device driver does not support write barriers,
to support this this patch adds REQ_FLUSH suppport.
Every time the block layer sends a REQ_FLUSH we fsync() now
our backing file to guarantee data consistency.

Reported-and-tested-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Richard Weinberger <richard@nod.at>