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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/Kconfig
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/Kconfig')
-rw-r--r--fs/btrfs/Kconfig2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index 7bb3c020e570..ecb9fd3be143 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -4,6 +4,8 @@ config BTRFS_FS
select LIBCRC32C
select ZLIB_INFLATE
select ZLIB_DEFLATE
+ select LZO_COMPRESS
+ select LZO_DECOMPRESS
help
Btrfs is a new filesystem with extents, writable snapshotting,
support for multiple devices and many more features.