linux-ext4 - Re: Please reserve INCOMPAT flags

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Message-ID: <20091205042556.GA7426@skywalker.linux.vnet.ibm.com>
Date:	Sat, 5 Dec 2009 09:55:56 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Andreas Dilger <adilger@....com>
Cc:	"Theodore Ts'o" <tytso@....edu>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Please reserve INCOMPAT flags

On Mon, Nov 30, 2009 at 12:15:11PM -0700, Andreas Dilger wrote:
> On 2009-09-06, at 03:25, Andreas Dilger wrote:
> >in addition to the data-in-dirent INCOMPAT flag Rahul sent the patches
> >for last week, I would like to ensure that we also have the INCOMPAT
> >flag for large EA-in-inode flag reserved.  This patch is going into
> >testing at one of our large customers, and I want to make sure that
> >we don't accidentally get a conflicting INCOMPAT flag assignment.
> >
> >#define EXT4_FEATURE_INCOMPAT_EA_INODE	0x0400
> >#define EXT4_FEATURE_INCOMPAT_DIRDATA   0x1000
> >
> >#define EXT4_EA_INODE_FL	0x00200000 /* Inode uses large EA */
> 
> 
> Hi Ted,
> I noticed Aneesh proposing to use the 0x0400 INCOMPAT flag for the
> NFSv4 ACL support, but this conflicts with the large EA feature we
> had previously discussed.  We now have a couple of customers using
> the large EA feature at this point, and I wouldn't want to break
> their filesystem as a result of an avoidable conflict.
> 
> I'll attach patches for this, which will hopefully make it easier,
> and the patch tracking tool will keep this visible.
> 
> Aneesh, maybe you can use 0x0800 for the INCOMPAT_RICHACL?
> 
> 

I have updated richacl patches to use 0x0800.

-aneesh
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