From: Li Zefan <lizf@cn.fujitsu.com>
Date: Fri, 19 Nov 2010 01:36:10 +0000 (+0000)
Subject: btrfs: Check if dest_offset is block-size aligned before cloning file
X-Git-Tag: v2.6.37-rc4~6^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2a6b8daedaf3682bed3fc1d4e2390491f6e19c49;p=pandora-kernel.git

btrfs: Check if dest_offset is block-size aligned before cloning file

We've done the check for src_offset and src_length, and We should
also check dest_offset, otherwise we'll corrupt the destination
file:

  (After cloning file1 to file2 with unaligned dest_offset)
  # cat /mnt/file2
  cat: /mnt/file2: Input/output error

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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