linux-kernel - Re: nfsd changes for 2.6.37

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Date:	Wed, 27 Oct 2010 09:12:06 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Christoph Hellwig <hch@...radead.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Bryan Schumaker <bjschuma@...app.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: nfsd changes for 2.6.37

On Wed, Oct 27, 2010 at 8:23 AM, Arnd Bergmann <arnd@...db.de> wrote:
>
> locks_delete_lock is also called with lock_flocks held and calls
> fasync_helper...

We don't really have to use fasync_helper.

In fact, the whole interface is pretty broken for something like file
locking, which isn't actually "fasync()". That whole "on/off as an
argument" is just crazy. It would be _trivial_ to expose a version of
fasync_helper() that takes a pre-allocated fasync_struct for add, and
that has separate helper functions for the add/delete case so that you
don't have the pointless crazy arguments (for "delete" the "fd"
argument is useless, and I do hate "modal" functions that take what
they should do as a flag).

Then fcntl_setlease() would trivially just allocate the dang thing before.

Something like the attached (UNTESTED!) perhaps?

                           Linus

View attachment "patch.diff" of type "text/x-patch" (5305 bytes)