From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Fri, 18 Jul 2014 01:55:43 +0000 (+0800)
Subject: btrfs: Return right extent when fiemap gives unaligned offset and len.
X-Git-Tag: omap-fixes-against-v3.17-rc3~41^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c91943b5066314a8bb9f0a65584e5e4cd92ea63;p=pandora-kernel.git

btrfs: Return right extent when fiemap gives unaligned offset and len.

When page aligned start and len passed to extent_fiemap(), the result is
good, but when start and len is not aligned, e.g. start = 1 and len =
4095 is passed to extent_fiemap(), it returns no extent.

The problem is that start and len is all rounded down which causes the
problem. This patch will round down start and round up (start + len) to
return right extent.

Reported-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
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