linux-kernel - Re: nfsd changes for 3.5

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Message-ID: <CA+55aFwGpVM2Dbe02gL5=cGJZ_t3b4PTAhqwrs5MHjsb5R6BaA@mail.gmail.com>
Date:	Thu, 31 May 2012 11:58:34 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	linux-nfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: nfsd changes for 3.5

On Thu, May 31, 2012 at 11:24 AM, J. Bruce Fields <bfields@...ldses.org> wrote:
>
> Sorry this is a bit late.  In fact I still have a review backlog (at a
> minimum some bugfixes), so will send a second pull later.

Quite frankly, I'm not going to pull this without lots of explanations.

The VFS-level changes have no acks or sign-offs from anybody else, and
quite frankly, if I understand them correctly they look f*cking
disgusting. If I read them right, they break delegations of a file
(which can involve long waits for clients - no?) while holding on to
the directory inode lock (both directories for cross-inode renames).
Which seems to be a singularly idiotic thing to do and sounds to me
like a fundamental design mistake.

We simply don't do these kinds of VFS changes without having
discussions and acks from people, notably Al.

As to "second pull later" - if you haven't reviewed the code already,
it's damn well much too late in the merge window to do it now.

So quite frankly, this *all* looks like 3.6 material to me, and that's
assuming you can convince people that file-delegation breaking really
should happen with all lookups on the directory the file is in blocked
by the directory inode mutex in the first place. Or tell me I'm a
moron and I misread the patches and don't know what I'm talking about.

          Linus
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