From 506427628afeb5d70eefdac1fe4c2a1ffb27df5f Mon Sep 17 00:00:00 2001
From: Asias He <asias@redhat.com>
Date: Mon, 25 Feb 2013 14:03:43 +0800
Subject: [PATCH] target/file: Add UNMAP emulation support

This patch adds support for emulation of UNMAP within
fd_execute_unmap() backend code.

If the FILEIO backend is normal file, the emulation uses fallocate to
punch hole to reclaim the free space used by the file. If the FILEIO
backend is block device, the emulation uses blkdev_issue_discard().

Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
Reading git-format-patch failed