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

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Date:   Fri, 25 Nov 2022 03:34:14 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Jeff Layton <jlayton@...nel.org>,
        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>,
        Christine Caulfield <ccaulfie@...hat.com>,
        David Teigland <teigland@...hat.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Bob Peterson <rpeterso@...hat.com>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Mike Marshall <hubcap@...ibond.com>,
        Martin Brandenburg <martin@...ibond.com>,
        "Darrick J. Wong" <djwong@...nel.org>, hch@....de,
        linux-kernel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
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Subject: Re: [PATCH] filelock: move file locking definitions to separate
 header file

On Tue, Nov 22, 2022 at 03:51:31AM +0000, Matthew Wilcox wrote:
> On Sun, Nov 20, 2022 at 03:59:57PM -0500, Jeff Layton wrote:
> > Move the file locking definitions to a new header file, and add the
> > appropriate #include directives to the source files that need them. By
> > doing this we trim down fs.h a bit and limit the amount of rebuilding
> > that has to be done when we make changes to the file locking APIs.
> 
> I'm in favour of this in general, but I think there's a few implicit
> includes.  Can you create a test.c that only #include
> <linnux/filelock.h> and see if there's anything missing?
> 
> > +	wait_queue_head_t fl_wait;
> > +	struct file *fl_file;
> 
> These two seem undefined at this point.
> 
> > +	struct fasync_struct *	fl_fasync; /* for lease break notifications */
> 
> Likewise.

#include <linux/wait.h>

struct file;
struct fasync_struct;