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Date:	Mon, 18 Apr 2011 19:15:41 +0800
From:	Coly Li <i@...y.li>
To:	liubo <liubo2009@...fujitsu.com>
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 2011年04月18日 17:01, liubo Wrote:
> 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/
> 

Thank you for the explaining. Now I understand this patch set is to make chattr of e2fsprogs to support a
(currently-only) btrfs feature.

It seems chattr and lsattr is not an ext[234] only utilities any more...

-- 
Coly Li
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