linux-kernel - Re: [PATCH] filelock: move file locking definitions to separate header file

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Message-ID: <Y4A6/ozhUncxbimi@ZenIV>
Date:   Fri, 25 Nov 2022 03:48:14 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Christian Schoenebeck <linux_oss@...debyte.com>,
        David Howells <dhowells@...hat.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        Xiubo Li <xiubli@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Steve French <sfrench@...ba.org>, Paulo Alcantara <pc@....nz>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Shyam Prasad N <sprasad@...rosoft.com>,
        Tom Talpey <tom@...pey.com>,
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        David Teigland <teigland@...hat.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Miklos Szeredi <miklos@...redi.hu>,
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Subject: Re: [PATCH] filelock: move file locking definitions to separate
 header file

On Sun, Nov 20, 2022 at 03:59:57PM -0500, Jeff Layton wrote:

> --- /dev/null
> +++ b/include/linux/filelock.h
> @@ -0,0 +1,428 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_FILELOCK_H
> +#define _LINUX_FILELOCK_H
> +
> +#include <linux/list.h>
> +#include <linux/nfs_fs_i.h>

Umm... I'd add a comment along the lines of "struct file_lock has
a BS union by fs type; NFS side of things needs nfs_fs_i.h"

> +struct lock_manager_operations {
> +	void *lm_mod_owner;
> +	fl_owner_t (*lm_get_owner)(fl_owner_t);

Probably take fl_owner_t to some more neutral header...

> +#define locks_inode(f) file_inode(f)

Why do we still have that one, anyway?  Separate patch, obviously,
but I would take Occam's Razor to that entity...

> +struct files_struct;
> +extern void show_fd_locks(struct seq_file *f,
> +			 struct file *filp, struct files_struct *files);

If anything, that would be better off as fl_owner_t...  Again, a separate
patch.