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

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Message-ID: <adar6eyx8y5.fsf@cisco.com>
Date:	Wed, 27 Feb 2008 15:42:42 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Christoph Hellwig <hch@....de>, linux-fsdevel@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Avi Kivity <avi@...ranet.com>, 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()

 > 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.

 - R.
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