Hi Chris,
Here's the updated patchset. As I still haven't got a kernel.org
account, I have set up a git tree in another public git repository,
and I'll use it for now.
You can pull from:
git://repo.or.cz/linux-btrfs-devel.git lzo-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 compression speed.
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 the tarball.
(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
Test:
Mitch has tested the patchset, and provided some positive feedback.
According to him, the patchset works as expected and nothing bad
has he experienced.
Other:
The defrag ioctl is also updated, so one can choose lzo or zlib when
turning on compression in defrag operation.
Main change from v1:
- Add incompat flag.
- Fix build issue by selecting kernel lzo module.
- Check compression type in defrag ioctl.
---------------->
Li Zefan (6):
btrfs: Fix bugs in zlib workspace
btrfs: Fix error handling in zlib
btrfs: Allow to add new compression algorithm
btrfs: Add lzo compression support
btrfs: Allow to specify compress method when defrag
btrfs: Extract duplicate decompress code
fs/btrfs/Makefile | 2 +-
fs/btrfs/btrfs_inode.h | 2 +-
fs/btrfs/compression.c | 329 +++++++++++++++++++++++++++++++++++++-
fs/btrfs/compression.h | 72 ++++++--
fs/btrfs/ctree.h | 11 +-
fs/btrfs/extent_io.c | 5 +-
fs/btrfs/extent_io.h | 17 ++-
fs/btrfs/extent_map.c | 2 +
fs/btrfs/extent_map.h | 3 +-
fs/btrfs/file.c | 2 +
fs/btrfs/inode.c | 82 ++++++----
fs/btrfs/ioctl.c | 10 +-
fs/btrfs/ioctl.h | 9 +-
fs/btrfs/lzo.c | 409 +++++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/ordered-data.c | 18 ++-
fs/btrfs/ordered-data.h | 8 +-
fs/btrfs/super.c | 47 +++++-
fs/btrfs/zlib.c | 361 +++++++----------------------------------
18 files changed, 1013 insertions(+), 376 deletions(-)
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