From: Li Zefan <lizf@cn.fujitsu.com>
Date: Fri, 2 Sep 2011 07:56:25 +0000 (+0800)
Subject: Btrfs: fix defragmentation regression
X-Git-Tag: v3.2-rc1~21^2~23^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cbcc83265d929ac71553c1b5dafdb830171af947;p=pandora-kernel.git

Btrfs: fix defragmentation regression

There's an off-by-one bug:

  # create a file with lots of 4K file extents
  # btrfs fi defrag /mnt/file
  # sync
  # filefrag -v /mnt/file
  Filesystem type is: 9123683e
  File size of /mnt/file is 1228800 (300 blocks, blocksize 4096)
   ext logical physical expected length flags
     0       0     3372              64
     1      64     3136     3435      1
     2      65     3436     3136     64
     3     129     3201     3499      1
     4     130     3500     3201     64
     5     194     3266     3563      1
     6     195     3564     3266     64
     7     259     3331     3627      1
     8     260     3628     3331     40 eof

After this patch:

  ...
  # filefrag -v /mnt/file
  Filesystem type is: 9123683e
  File size of /mnt/file is 1228800 (300 blocks, blocksize 4096)
   ext logical physical expected length flags
     0       0     3372             300 eof
  /mnt/file: 1 extent found

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