linux-kernel - Re: [RFC][PATCHSET v3] non-recursive pathname resolution & RCU symlinks

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Message-ID: <CA+55aFz=57VU85jEe51TySUtC-gaVKzNsQGLX2HgD2tcz7ausw@mail.gmail.com>
Date:	Sun, 17 May 2015 09:56:13 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	NeilBrown <neilb@...e.de>, Andreas Dilger <adilger@...ger.ca>,
	Dave Chinner <david@...morbit.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFC][PATCHSET v3] non-recursive pathname resolution & RCU symlinks

On Sun, May 17, 2015 at 9:43 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
>         d_instantiate(dentry, inode);
>
> could decide that *before* it does that "d_instantiate()", it could
> pre-populate the child list of 'dentry' with the lookup information
> for 'b' (and possibly recursively for 'c' too under 'd').

Yech, nfs uses d_splice_alias(), so we'd have to add some logic to
throw away any preloaded entries there if we actually have an alias
and end up merging and using the alias. Or something. Because I think
we'd have a dentry leak otherwise.

So it wouldn't work "as-is", but it might still be reasonably easy.

                    Linus
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