btrfs: Allow to add new compression algorithm
authorLi Zefan <lizf@cn.fujitsu.com>
Fri, 17 Dec 2010 06:21:50 +0000 (14:21 +0800)
committerLi Zefan <lizf@cn.fujitsu.com>
Wed, 22 Dec 2010 15:15:45 +0000 (23:15 +0800)
Make the code aware of compression type, instead of always assuming
zlib compression.

Also make the zlib workspace function as common code for all
compression types.

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

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