linux-kernel - Re: [PATCH 5/5 UPDATED] CUSE: implement CUSE

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Message-Id: <E1L5HDg-0001Ty-1u@pomaz-ex.szeredi.hu>
Date:	Wed, 26 Nov 2008 11:02:04 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	tj@...nel.org
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	fuse-devel@...ts.sourceforge.net, miklos@...redi.hu, greg@...ah.com
Subject: Re: [PATCH 5/5 UPDATED] CUSE: implement CUSE - Character device in Userspace

Hi Tejun,

Apologies for the late review.

On Sat, 22 Nov 2008, Tejun Heo wrote:
> + * cuse_conn	: contains fuse_conn and serves as bonding structure
> + * channel	: file handle connected to the userland CUSE server
> + * cdev		: the implemented character device
> + * mnt		: vfsmount which serves dentry and inode for cdev

Hmm, this mount thing seems rather pointless to me.  I understand the
motivation: to let the unmodified fuse functions use
get_fuse_conn(inode) and get_node_id(inode).  But I think we should
really bite the bullet and reimplement these functions so that they
take fuse_conn and node_id as arguments instead of the inode (and
separate out those parts which do really need the inode for the
memory mappings).

It's a bit more work on the fuse side, but overall it results in a
much cleaner architecture, don't you think?

> +	worker = kthread_run(cuse_init_worker, cuse_conn_get(cc),
> +			     "cuse-init-pid%d", current->pid);

This could be done without a kthread, by setting the ->end() callback
for the INIT request, no?

Thanks,
Miklos
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