linux-kernel - Re: [RFC][patch series] vfsmount gutting

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Message-ID: <20111208121956.GX4387@parisc-linux.org>
Date:	Thu, 8 Dec 2011 05:19:57 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][patch series] vfsmount gutting

On Thu, Dec 08, 2011 at 01:02:52AM +0000, Al Viro wrote:
> 	OK, that's something I wanted to do for a long time - struct vfsmount
> contains too much stuff that is strictily VFS-internal and not needed by
> anything outside of a very small subset of VFS, at that.  As the matter of
> fact, only 3 fields, 1 of them redundant, are used by code outside of that
> area - it's mnt_flags ("how it's mounted"), mnt_root ("what dentry tree
> is mounted here", assign-once thing) and mnt_sb (always equal to
> mnt_root->d_sb, also assign-once, might or might not be not needed).

If only these 3 fields are used, why not make the definition of struct
vfsmount entirely hidden, and add accessor functions for those three?

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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