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

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Date:	Tue, 17 Jan 2012 16:56:24 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Chris Mason <chris.mason@...cle.com>, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org
Subject: Re: Updated btrfs/crypto snappy interface ready for merging

Andi Kleen wrote:
>> It's because decompressing inline extents always fails. I've fixed it
>> and will send the patch out in a new mail thread.
> 
> Thanks for fixing.
> 
>>
>> 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:
> 
> Hmm weird, I have never seen this. Do you have a reproducer?
> 

Just use some randomly chosen text files. For example:

	# mount -t btrfs -o compress=snappy /dev/xxx /mnt
	# cp -r btrfs-progs-unstable/ /mnt
	# sync
	# echo 3 > /proc/sys/vm/drop_caches
	# diff -Nurp btrfs-progs-unstable /mnt/btrfs-progs-unstable

I've tested on both x86_32 and x86_64.

> The basic compression code is quite well tested, I have a reasonable
> unit test.
> 
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