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a6fa6fae40
linux/fs/btrfs
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Li Zefan a6fa6fae40 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>
2010-12-22 23:15:47 +08:00
..
acl.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2010-06-11 14:18:47 -07:00
async-thread.c Btrfs: don't walk around with task->state != TASK_RUNNING 2010-05-25 10:34:58 -04:00
async-thread.h Btrfs: fix deadlock on async thread startup 2009-10-05 09:44:45 -04:00
btrfs_inode.h btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
compat.h Btrfs: drop remaining LINUX_KERNEL_VERSION checks and compat code 2009-01-06 09:38:55 -05:00
compression.c btrfs: Add lzo compression support 2010-12-22 23:15:47 +08:00
compression.h btrfs: Add lzo compression support 2010-12-22 23:15:47 +08:00
ctree.c Btrfs: cleanup warnings from gcc 4.6 (nonbugs) 2010-10-29 15:14:37 -04:00
ctree.h btrfs: Add lzo compression support 2010-12-22 23:15:47 +08:00
delayed-ref.c Btrfs: Integrate metadata reservation with start_transaction 2010-05-25 10:34:50 -04:00
delayed-ref.h Btrfs: Integrate metadata reservation with start_transaction 2010-05-25 10:34:50 -04:00
dir-item.c Btrfs: Fix variables set but not read (bugs found by gcc 4.6) 2010-10-29 15:14:31 -04:00
disk-io.c btrfs: Add lzo compression support 2010-12-22 23:15:47 +08:00
disk-io.h Btrfs: use async helpers for DIO write checksumming 2010-05-25 10:34:58 -04:00
export.c Btrfs: handle NFS lookups properly 2010-11-21 22:26:08 -05:00
export.h NFS support for btrfs - v3 2008-09-25 11:04:06 -04:00
extent_io.c btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
extent_io.h btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
extent_map.c btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
extent_map.h btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
extent-tree.c Btrfs: prevent RAID level downgrades when space is low 2010-12-13 20:07:01 -05:00
file-item.c Btrfs: add basic DIO read/write support 2010-05-25 10:34:57 -04:00
file.c btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
free-space-cache.c Btrfs: deal with space cache errors better 2010-12-09 13:57:12 -05:00
free-space-cache.h Btrfs: load free space cache if it exists 2010-10-29 09:26:35 -04:00
hash.h Btrfs: remove crc32c.h and use libcrc32c directly. 2009-06-10 11:29:53 -04:00
inode-item.c Btrfs: Integrate metadata reservation with start_transaction 2010-05-25 10:34:50 -04:00
inode-map.c Btrfs: do not reuse objectid of deleted snapshot/subvol 2009-09-21 15:56:00 -04:00
inode.c btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
ioctl.c btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
ioctl.h Btrfs: Make async snapshot ioctl more generic 2010-12-10 16:29:11 -05:00
Kconfig btrfs: Add lzo compression support 2010-12-22 23:15:47 +08:00
locking.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
locking.h Btrfs: fix spinlock assertions on UP systems 2009-03-09 11:45:38 -04:00
lzo.c btrfs: Add lzo compression support 2010-12-22 23:15:47 +08:00
Makefile btrfs: Add lzo compression support 2010-12-22 23:15:47 +08:00
ordered-data.c btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
ordered-data.h btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00
orphan.c Btrfs: fixup return code for btrfs_del_orphan_item 2010-12-09 13:57:15 -05:00
print-tree.c Btrfs: remove of redundant btrfs_header_level 2009-07-22 16:52:13 -04:00
print-tree.h
ref-cache.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
ref-cache.h Btrfs: use RB_ROOT to intialize rb_trees instead of setting rb_node to NULL 2010-03-08 16:26:50 -05:00
relocation.c Btrfs: Fix variables set but not read (bugs found by gcc 4.6) 2010-10-29 15:14:31 -04:00
root-tree.c Btrfs: cleanup warnings from gcc 4.6 (nonbugs) 2010-10-29 15:14:37 -04:00
struct-funcs.c Btrfs: Fix checkpatch.pl warnings 2009-01-05 21:25:51 -05:00
super.c btrfs: Add lzo compression support 2010-12-22 23:15:47 +08:00
sysfs.c Driver core: Constify struct sysfs_ops in struct kobj_type 2010-03-07 17:04:49 -08:00
transaction.c Btrfs: use dget_parent where we can UPDATED 2010-11-21 22:26:09 -05:00
transaction.h Btrfs: add START_SYNC, WAIT_SYNC ioctls 2010-10-29 15:41:32 -04:00
tree-defrag.c Btrfs: cleanup warnings from gcc 4.6 (nonbugs) 2010-10-29 15:14:37 -04:00
tree-log.c Btrfs: use dget_parent where we can UPDATED 2010-11-21 22:26:09 -05:00
tree-log.h Btrfs: Metadata ENOSPC handling for tree log 2010-05-25 10:34:53 -04:00
version.h Update Btrfs files for in-kernel usage 2008-09-25 15:41:59 -04:00
version.sh Btrfs: Fixes for 2.6.28-rc API changes 2008-11-19 21:17:22 -05:00
volumes.c Btrfs: account for missing devices in RAID allocation profiles 2010-12-13 20:06:52 -05:00
volumes.h Btrfs: account for missing devices in RAID allocation profiles 2010-12-13 20:06:52 -05:00
xattr.c Btrfs: cleanup warnings from gcc 4.6 (nonbugs) 2010-10-29 15:14:37 -04:00
xattr.h btrfs: constify xattr_handler 2010-05-21 18:31:18 -04:00
zlib.c btrfs: Allow to add new compression algorithm 2010-12-22 23:15:45 +08:00