linux-kernel - Re: [PATCH -V6 25/26] ext4: Implement rich acl for ext4

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Message-ID: <87zki99ih1.fsf@skywalker.in.ibm.com>
Date:	Tue, 13 Sep 2011 09:55:30 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	dhowells@...hat.com, agruen@...nel.org, bfields@...ldses.org,
	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V6 25/26] ext4: Implement rich acl for ext4

On Fri, 09 Sep 2011 13:45:58 +0100, David Howells <dhowells@...hat.com> wrote:
> Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com> wrote:
> 
> > +	retval = ext4_set_richacl(handle, inode, acl);
> > +	ext4_journal_stop(handle);
> > +	if (retval == ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
> > +		goto retry;
> 
> Should that be -ENOSPC?

Fixed 

> 
> I do wonder, why does ext4 need to know about richacls at all?  Surely, as far
> as ext4 is concerned, they should be seen as xattrs?
> 

richacl related changes to ext4 is minimal. They mostly are to call
necessary permission check functions and to map xattr to richacl
structure.


> If ext4 needs a mark on disk to say it supports richacls, then why can't that
> simply be the presence or lack thereof of a richacl on the root dir?
> 

I have a patch in the full series which enable richacl on ext4 file system
based on ext4 compatibility flags. I didn't add that as a part of this
series to enable easy testing. The goal is to use tune2fs to enable
richacl and them the mount option -o acl enable richacl/posix acl
accordingly. 

-aneesh
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