linux-kernel - Re: [RFC PATCH 03/12] locks: have locks_release_file use flock_lock

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Date:	Wed, 10 Sep 2014 13:38:43 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Jeff Layton <jlayton@...marydata.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Al Viro <viro@...IV.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFC PATCH 03/12] locks: have locks_release_file use
 flock_lock_file to release generic flock locks

On Wed, Sep 10, 2014 at 10:28:41AM -0400, Jeff Layton wrote:
> Signed-off-by: Jeff Layton <jlayton@...marydata.com>

ACK to going ahead and applying this now if you want.

Took me a moment to understand why the i_flock test got moved--OK, so
the locks_remove_*'s are doing that themselves instead, got it.

--b.

> ---
>  fs/locks.c | 49 +++++++++++++++++++++++++++++++------------------
>  1 file changed, 31 insertions(+), 18 deletions(-)
> 
> diff --git a/fs/locks.c b/fs/locks.c
> index af55bd35be5f..5e8b865814a2 100644
> --- a/fs/locks.c
> +++ b/fs/locks.c
> @@ -2393,6 +2393,30 @@ void locks_remove_posix(struct file *filp, fl_owner_t owner)
>  
>  EXPORT_SYMBOL(locks_remove_posix);
>  
> +static void
> +locks_remove_flock(struct file *filp)
> +{
> +	struct file_lock fl = {
> +		.fl_owner = filp,
> +		.fl_pid = current->tgid,
> +		.fl_file = filp,
> +		.fl_flags = FL_FLOCK,
> +		.fl_type = F_UNLCK,
> +		.fl_end = OFFSET_MAX,
> +	};
> +
> +	if (!file_inode(filp)->i_flock)
> +		return;
> +
> +	if (filp->f_op->flock)
> +		filp->f_op->flock(filp, F_SETLKW, &fl);
> +	else
> +		flock_lock_file(filp, &fl);
> +
> +	if (fl.fl_ops && fl.fl_ops->fl_release_private)
> +		fl.fl_ops->fl_release_private(&fl);
> +}
> +
>  /*
>   * This function is called on the last close of an open file.
>   */
> @@ -2403,24 +2427,14 @@ void locks_remove_file(struct file *filp)
>  	struct file_lock **before;
>  	LIST_HEAD(dispose);
>  
> -	if (!inode->i_flock)
> -		return;
> -
> +	/* remove any OFD locks */
>  	locks_remove_posix(filp, filp);
>  
> -	if (filp->f_op->flock) {
> -		struct file_lock fl = {
> -			.fl_owner = filp,
> -			.fl_pid = current->tgid,
> -			.fl_file = filp,
> -			.fl_flags = FL_FLOCK,
> -			.fl_type = F_UNLCK,
> -			.fl_end = OFFSET_MAX,
> -		};
> -		filp->f_op->flock(filp, F_SETLKW, &fl);
> -		if (fl.fl_ops && fl.fl_ops->fl_release_private)
> -			fl.fl_ops->fl_release_private(&fl);
> -	}
> +	/* remove flock locks */
> +	locks_remove_flock(filp);
> +
> +	if (!inode->i_flock)
> +		return;



>  
>  	spin_lock(&inode->i_lock);
>  	before = &inode->i_flock;
> @@ -2440,8 +2454,7 @@ void locks_remove_file(struct file *filp)
>  			 * some info about it and then just remove it from
>  			 * the list.
>  			 */
> -			WARN(!IS_FLOCK(fl),
> -				"leftover lock: dev=%u:%u ino=%lu type=%hhd flags=0x%x start=%lld end=%lld\n",
> +			WARN(1, "leftover lock: dev=%u:%u ino=%lu type=%hhd flags=0x%x start=%lld end=%lld\n",
>  				MAJOR(inode->i_sb->s_dev),
>  				MINOR(inode->i_sb->s_dev), inode->i_ino,
>  				fl->fl_type, fl->fl_flags,
> -- 
> 1.9.3
> 
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