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

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Date:	Wed, 19 Oct 2011 12:42:16 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
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 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));

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

--b.
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