linux-kernel - Re: [PATCH v1 05/11] locks: encapsulate the fl

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Message-ID: <20130604201759.GB15594@fieldses.org>
Date:	Tue, 4 Jun 2013 16:17:59 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	viro@...iv.linux.org.uk, matthew@....cx, dhowells@...hat.com,
	sage@...tank.com, smfrench@...il.com, swhiteho@...hat.com,
	Trond.Myklebust@...app.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-afs@...ts.infradead.org,
	ceph-devel@...r.kernel.org, linux-cifs@...r.kernel.org,
	samba-technical@...ts.samba.org, cluster-devel@...hat.com,
	linux-nfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	piastryyy@...il.com
Subject: Re: [PATCH v1 05/11] locks: encapsulate the fl_link list handling

On Fri, May 31, 2013 at 11:07:28PM -0400, Jeff Layton wrote:
> Move the fl_link list handling routines into a separate set of helpers.
> Also move the global list handling out of locks_insert_block, and into
> the caller that ends up triggering it as that allows us to eliminate the
> IS_POSIX check there.

ACK.--b.

> 
> Signed-off-by: Jeff Layton <jlayton@...hat.com>
> ---
>  fs/locks.c |   34 +++++++++++++++++++++++++++++-----
>  1 files changed, 29 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/locks.c b/fs/locks.c
> index cef0e04..caca466 100644
> --- a/fs/locks.c
> +++ b/fs/locks.c
> @@ -494,13 +494,38 @@ static int posix_same_owner(struct file_lock *fl1, struct file_lock *fl2)
>  	return fl1->fl_owner == fl2->fl_owner;
>  }
>  
> +/* Remove a blocker or lock from one of the global lists */
> +static inline void
> +locks_insert_global_blocked(struct file_lock *waiter)
> +{
> +	list_add(&waiter->fl_link, &blocked_list);
> +}
> +
> +static inline void
> +locks_delete_global_blocked(struct file_lock *waiter)
> +{
> +	list_del_init(&waiter->fl_link);
> +}
> +
> +static inline void
> +locks_insert_global_locks(struct file_lock *waiter)
> +{
> +	list_add_tail(&waiter->fl_link, &file_lock_list);
> +}
> +
> +static inline void
> +locks_delete_global_locks(struct file_lock *waiter)
> +{
> +	list_del_init(&waiter->fl_link);
> +}
> +
>  /* Remove waiter from blocker's block list.
>   * When blocker ends up pointing to itself then the list is empty.
>   */
>  static void __locks_delete_block(struct file_lock *waiter)
>  {
>  	list_del_init(&waiter->fl_block);
> -	list_del_init(&waiter->fl_link);
> +	locks_delete_global_blocked(waiter);
>  	waiter->fl_next = NULL;
>  }
>  
> @@ -524,8 +549,6 @@ static void locks_insert_block(struct file_lock *blocker,
>  	BUG_ON(!list_empty(&waiter->fl_block));
>  	list_add_tail(&waiter->fl_block, &blocker->fl_block);
>  	waiter->fl_next = blocker;
> -	if (IS_POSIX(blocker))
> -		list_add(&waiter->fl_link, &blocked_list);
>  }
>  
>  /* Wake up processes blocked waiting for blocker.
> @@ -552,7 +575,7 @@ static void locks_wake_up_blocks(struct file_lock *blocker)
>   */
>  static void locks_insert_lock(struct file_lock **pos, struct file_lock *fl)
>  {
> -	list_add(&fl->fl_link, &file_lock_list);
> +	locks_insert_global_locks(fl);
>  
>  	fl->fl_nspid = get_pid(task_tgid(current));
>  
> @@ -573,7 +596,7 @@ static void locks_delete_lock(struct file_lock **thisfl_p)
>  
>  	*thisfl_p = fl->fl_next;
>  	fl->fl_next = NULL;
> -	list_del_init(&fl->fl_link);
> +	locks_delete_global_locks(fl);
>  
>  	if (fl->fl_nspid) {
>  		put_pid(fl->fl_nspid);
> @@ -839,6 +862,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
>  				goto out;
>  			error = FILE_LOCK_DEFERRED;
>  			locks_insert_block(fl, request);
> +			locks_insert_global_blocked(request);
>  			goto out;
>    		}
>    	}
> -- 
> 1.7.1
> 
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