linux-kernel - Re: [PATCH] xen: add xenfs to allow usermode <-> Xen interaction

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Date:	Tue, 16 Dec 2008 21:46:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Al Viro <viro@....linux.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Alex Zeffertt <alex.zeffertt@...citrix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH] xen: add xenfs to allow usermode <-> Xen interaction


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> [ Reviewers: This is in drivers/xen to keep it close to the code it is 
>   and will be using.  Would people prefer to see it in fs/xenfs? -J ]

> +config XENFS
> +	tristate "Xen filesystem"

there's about two dozen filesystems that live not in fs/*:

./net/socket.c:	register_filesystem(&sock_fs_type);
./net/sunrpc/rpc_pipe.c:	err = register_filesystem(&rpc_pipe_fs_type);
./security/selinux/selinuxfs.c:	err = register_filesystem(&sel_fs_type);
./security/inode.c:	retval = register_filesystem(&fs_type);
./security/smack/smackfs.c:	err = register_filesystem(&smk_fs_type);
./drivers/usb/core/inode.c:	retval = register_filesystem(&usb_fs_type);
./drivers/usb/gadget/inode.c:	status = register_filesystem (&gadgetfs_type);
./drivers/oprofile/oprofilefs.c:	return register_filesystem(&oprofilefs_type);
./drivers/misc/ibmasm/ibmasmfs.c:	return register_filesystem(&ibmasmfs_type);
./drivers/isdn/capi/capifs.c:	err = register_filesystem(&capifs_fs_type);
./drivers/infiniband/hw/ipath/ipath_fs.c:	return register_filesystem(&ipathfs_fs_type);
./drivers/infiniband/core/uverbs_main.c:	ret = register_filesystem(&uverbs_event_fs);
./mm/shmem.c:	error = register_filesystem(&tmpfs_fs_type);
./mm/tiny-shmem.c:	BUG_ON(register_filesystem(&tmpfs_fs_type) != 0);
./ipc/mqueue.c:	error = register_filesystem(&mqueue_fs_type);
./kernel/cpuset.c:	err = register_filesystem(&cpuset_fs_type);
./kernel/cgroup.c:	err = register_filesystem(&cgroup_fs_type);
./include/linux/fs.h:extern int register_filesystem(struct file_system_type *);
./arch/s390/hypfs/inode.c:	rc = register_filesystem(&hypfs_type);
./arch/ia64/kernel/perfmon.c:	int err = register_filesystem(&pfm_fs_type);
./arch/powerpc/platforms/cell/spufs/inode.c:	ret = register_filesystem(&spufs_type);

by the looks of it it wants to live in drivers/xen/. It's a minimalistic 
API-only filesystem.

Nevertheless it would be nice to have Acks from FS experts. Security, 
races, obsoleteness of approach, etc.

	Ingo
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