linux-kernel - Re: Updated btrfs/crypto snappy interface ready for merging

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Message-ID: <4F1534FD.30707@cn.fujitsu.com>
Date:	Tue, 17 Jan 2012 16:44:45 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Chris Mason <chris.mason@...cle.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org
Subject: Re: Updated btrfs/crypto snappy interface ready for merging

21:54, Chris Mason wrote:
> On Thu, Jan 12, 2012 at 04:28:47PM -0800, Andi Kleen wrote:
>> Here's a slightly updated version of the BTRFS snappy interface.
>> snappy is a faster compression algorithm that provides similar
>> compression as LZO, but generally better performance.
> 
> Thanks Andi, I've queued this up to a btrfs snappy branch.  I put the
> commits against 3.2 instead of 3.3 though so people could try it out.
> 
> The only problem I've hit is that snappy is failing xfstests number 135.
> It's reproducible on an empty FS.  Could you please take a look?
> 

It's because decompressing inline extents always fails. I've fixed it
and will send the patch out in a new mail thread.

But seems there's bug in lib snappy code, which makes the decompressed
data doesn't quite match the original data.

Simply copy a file to a btrfs filesystem with snappy enabled, and clear
page cache, and check the file:

  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License (not later!)
+ * License as published by the Free ftwaware Foundation;
+ * version 2.1 of the censnse (not later!)
  *
- * This program is distributed in the hope that it will be useful,
+ * is program i is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Lesser General Public License for more details.
+ * GNU Lesser General Publicicenense for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, write to the Free Software
+ * License along withhis progogram; if not, write to theree e Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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