linux-kernel - Re: [PATCH/RFC 1/2] anon-inodes: Remove fd_install() from anon_inode

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Message-ID: <47C66839.7080607@qumranet.com>
Date:	Thu, 28 Feb 2008 09:52:25 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	Davide Libenzi <davidel@...ilserver.org>,
	Christoph Hellwig <hch@....de>, linux-fsdevel@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm-devel@...ts.sourceforge.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@....linux.org.uk>
Subject: Re: [PATCH/RFC 1/2] anon-inodes: Remove fd_install() from anon_inode_getfd()

Roland Dreier wrote:
>  > http://git.kernel.org/?p=linux/kernel/git/viro/vfs-2.6.git;a=commit;h=49be4f8114e6ff0efdab10ebba2493fb67bc3034
>
> Actually, looking closer at the kvm changes here, I think that
> create_vcpu_fd() needs the same treatment as kvm_dev_ioctl_create_vm()
> gets in the patch because of the race I mentioned in the changelog
> for my patch: otherwise kvm_vcpu_release() could drop the last
> reference to vcpu->kvm->filp before the get_file() gets an extra
> reference.
>
> I'm beginning to think that moving the fd_install() out of
> anon_inode_getfd() really is worth it to make a safer interface.
>   

It makes is less usable, though (since the last step needs to be taken 
by the caller.

We might add a int (*prepare_file)(...) parameter which 
anon_inode_getfd() uses to munge the file before installing it.

-- 
error compiling committee.c: too many arguments to function

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