linux-kernel - Re: [rfc 2/7] procfs: Convert /proc/pid/fdinfo/ handling routines to seq-file

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Date:	Thu, 5 Jul 2012 21:37:29 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	James Bottomley <jbottomley@...allels.com>
Subject: Re: [rfc 2/7] procfs: Convert /proc/pid/fdinfo/ handling routines to
 seq-file

On Wed, Jul 04, 2012 at 11:37:26AM +0400, Pavel Emelyanov wrote:
...
> 
> I believe we can still have the proc_fdinfo_read and proc_fd_link code non-splitted.
> Just push a callback pointer ino the proc_fd_info (as usual -- we an opaque void *argument).

Hi Pavel, sorry for delay (was busy a bit). It seems this wont work.
Look, previously we have had

static int proc_fd_info(struct inode *inode, struct path *path, char *info)
{
	struct task_struct *task = get_proc_task(inode);
	...

	if (info) {
		...
	}

	this makes info argument optional
}

static int proc_fd_link(struct dentry *dentry, struct path *path)
{
	return proc_fd_info(dentry->d_inode, path, NULL);
}

it's possible because we didn't use seq-files engine. One we switch to
seq-files the old proc_fd_info become a part of

static const struct file_operations proc_fdinfo_file_operations = {
	.open		= seq_fdinfo_open,

ie the declaration of seq_fdinfo_open is restricted to file_operations::open
method and I can't add opaque void *argument here.

Sure I can add one more wrapper function but I guess this increase code
complexity which I tried to escape.

	Cyrill
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