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authorLi Zefan <lizf@cn.fujitsu.com>2010-10-25 15:12:26 +0800
committerLi Zefan <lizf@cn.fujitsu.com>2010-12-22 23:15:47 +0800
commita6fa6fae40ec336c7df6155255ae64ebef43a8bc (patch)
tree6cda8aa6a60967206614a941f034249e3017913e /fs/btrfs/compression.h
parent261507a02ccba9afda919852263b6bc1581ce1ef (diff)
downloadlinux-a6fa6fae40ec336c7df6155255ae64ebef43a8bc.tar.bz2
btrfs: Add lzo compression support
Lzo is a much faster compression algorithm than gzib, so would allow more users to enable transparent compression, and some users can choose from compression ratio and speed for different applications Usage: # mount -t btrfs -o compress[=<zlib,lzo>] dev /mnt or # mount -t btrfs -o compress-force[=<zlib,lzo>] dev /mnt "-o compress" without argument is still allowed for compatability. Compatibility: If we mount a filesystem with lzo compression, it will not be able be mounted in old kernels. One reason is, otherwise btrfs will directly dump compressed data, which sits in inline extent, to user. Performance: The test copied a linux source tarball (~400M) from an ext4 partition to the btrfs partition, and then extracted it. (time in second) lzo zlib nocompress copy: 10.6 21.7 14.9 extract: 70.1 94.4 66.6 (data size in MB) lzo zlib nocompress copy: 185.87 108.69 394.49 extract: 193.80 132.36 381.21 Changelog: v1 -> v2: - Select LZO_COMPRESS and LZO_DECOMPRESS in btrfs Kconfig. - Add incompability flag. - Fix error handling in compress code. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Diffstat (limited to 'fs/btrfs/compression.h')
-rw-r--r--fs/btrfs/compression.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index 9b5f2f365b79..f7ce217113fa 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -73,5 +73,6 @@ struct btrfs_compress_op {
};
extern struct btrfs_compress_op btrfs_zlib_compress;
+extern struct btrfs_compress_op btrfs_lzo_compress;
#endif