linux-kernel - Re: [PATCH -V7 08/26] vfs: Add new file and directory create permission flags

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Message-ID: <87r5285jef.fsf@linux.vnet.ibm.com>
Date:	Thu, 20 Oct 2011 10:50:08 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	agruen@...nel.org, akpm@...ux-foundation.org,
	viro@...iv.linux.org.uk, dhowells@...hat.com,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V7 08/26] vfs: Add new file and directory create permission flags

On Wed, 19 Oct 2011 12:42:16 -0400, "J. Bruce Fields" <bfields@...ldses.org> wrote:
> On Tue, Oct 18, 2011 at 09:02:43PM +0530, Aneesh Kumar K.V wrote:
> > From: Andreas Gruenbacher <agruen@...nel.org>
> > 
> > Some permission models distinguish between the permission to create a
> > non-directory and a directory.  Pass this information down to
> > inode_permission() as mask flags
> ...
> > diff --git a/include/linux/fs.h b/include/linux/fs.h
> > index f3ebf86..60361c6 100644
> > --- a/include/linux/fs.h
> > +++ b/include/linux/fs.h
> > @@ -67,6 +67,8 @@ struct inodes_stat_t {
> >  #define MAY_CHDIR		0x00000040
> >  /* called from RCU mode, don't block */
> >  #define MAY_NOT_BLOCK		0x00000080
> > +#define MAY_CREATE_FILE		0x00000100
> > +#define MAY_CREATE_DIR		0x00000200
> 
> Hm, are the flags in fs/nfsd/vfs.h going to need fixing up?
> 
> Looking at the nfsd code....  No, I guess it's OK, nfsd does
> 
> 	err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC));
> 

nfsd bits need fixing once nfs starts doing richacl permission check.
The changes I did can be found at
https://github.com/kvaneesh/linux/commits/richacl-fullset/


> So we can wait to fix up any collisions until we need to pass these
> extra bits.
> 

Yes. And that we will do once we get the VFS and local file system
changes upstream.

-aneesh

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