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Date:	Mon, 18 Apr 2011 17:01:36 +0800
From:	liubo <liubo2009@...fujitsu.com>
To:	i@...y.li
CC:	ext4 <linux-ext4@...r.kernel.org>,
	Linux Btrfs <linux-btrfs@...r.kernel.org>,
	tytso <tytso@....edu>, Chris Mason <chris.mason@...cle.com>
Subject: Re: [PATCH 1/2] E2fsprogs: use the generic inode flags

On 04/18/2011 04:41 PM, Coly Li wrote:
> On 2011年04月18日 15:37, liubo Wrote:
>> Signed-off-by: Liu Bo <liubo2009@...fujitsu.com>
>> ---
>>  debugfs/htree.c        |    2 +-
>>  e2fsck/pass1.c         |   22 +++++++++++-----------
>>  e2fsck/pass2.c         |    2 +-
>>  e2fsck/pass4.c         |    2 +-
>>  e2fsck/rehash.c        |    4 ++--
>>  ext2ed/inode_com.c     |   14 +++++++-------
>>  lib/e2p/fgetflags.c    |    6 +++---
>>  lib/e2p/fsetflags.c    |    6 +++---
>>  lib/e2p/getflags.c     |    6 +++---
>>  lib/e2p/pf.c           |   34 +++++++++++++++++-----------------
>>  lib/e2p/setflags.c     |    6 +++---
>>  lib/ext2fs/ext2_fs.h   |   44 ++++++++++++++++++++++----------------------
>>  lib/ext2fs/link.c      |    4 ++--
>>  lib/ext2fs/mkjournal.c |    2 +-
>>  misc/chattr.c          |   26 +++++++++++++-------------
>>  misc/tune2fs.c         |    2 +-
>>  16 files changed, 91 insertions(+), 91 deletions(-)
>> [snip]
> 
> Hi Bo,
> 
> Could you please to introduce the motivation of this patch set a little bit more? Thanks.
> 

Hi Li,

Since we want to control COW and compression attribute on a per file or per directory basis,
and find that the generic command "chattr" is the "Mr Right".

Currently only btrfs supports both, of course.

With these patches, we can do the followings:

c: compress
C: nocow

set compress & nocow:

# ./misc/chattr -V +c +C /mnt/btrfs/dir/
chattr 1.41.14 (22-Dec-2010)
Flags of /mnt/btrfs/dir/ set as --------c------C

# ./misc/lsattr -d /mnt/btrfs/dir/
--------c------C /mnt/btrfs/dir/

thanks,
liubo
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