From: Li Zefan <lizf@cn.fujitsu.com>
Date: Fri, 2 Sep 2011 07:56:55 +0000 (+0800)
Subject: Btrfs: fix wrong max_to_defrag in btrfs_defrag_file()
X-Git-Tag: v3.2-rc1~21^2~23^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5ca496604b5975d371bb669ee6c2394bcbea818f;p=pandora-kernel.git

Btrfs: fix wrong max_to_defrag in btrfs_defrag_file()

It's off-by-one, and thus we may skip the last page while defragmenting.

An example case:

  # create /mnt/file with 2 4K file extents
  # btrfs fi defrag /mnt/file
  # sync
  # filefrag /mnt/file
  /mnt/file: 2 extents found

So it's not defragmented.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
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