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Re: [Cluster-devel] [PATCH 9/9] fs: dlm: lockd: Convert int result to unsigned char type



On Sun, 20 Jul 2014 11:23:43 -0700
Joe Perches <joe perches com> wrote:

> op->info.rv is an s32, but it's only used as a u8.
> 

I don't understand this patch. info.rv is s32 (and I assume that "rv"
stands for "return value"). What I don't get is why you think it's just
used as a u8. It seems to be used more like a bool than anything else,
and I'm not sure that "type" is really a good description for it. Maybe
it should be a "bool" and named "conflict", given the comments in
dlm_posix_get ?

> Signed-off-by: Joe Perches <joe perches com>
> ---
>  fs/dlm/plock.c     |  6 +++---
>  fs/lockd/svclock.c | 10 +++++-----
>  include/linux/fs.h |  2 +-
>  3 files changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
> index 3e0b6fc..267849d 100644
> --- a/fs/dlm/plock.c
> +++ b/fs/dlm/plock.c
> @@ -30,7 +30,7 @@ struct plock_op {
>  
>  struct plock_xop {
>  	struct plock_op xop;
> -	int (*callback)(struct file_lock *fl, int result);
> +	int (*callback)(struct file_lock *fl, unsigned char type);
>  	void *fl;
>  	void *file;
>  	struct file_lock flc;
> @@ -190,7 +190,7 @@ static int dlm_plock_callback(struct plock_op *op)
>  	struct file *file;
>  	struct file_lock *fl;
>  	struct file_lock *flc;
> -	int (*notify)(struct file_lock *fl, int result) = NULL;
> +	int (*notify)(struct file_lock *fl, unsigned char type) = NULL;
>  	struct plock_xop *xop = (struct plock_xop *)op;
>  	int rv = 0;
>  
> @@ -209,7 +209,7 @@ static int dlm_plock_callback(struct plock_op *op)
>  	notify = xop->callback;
>  
>  	if (op->info.rv) {
> -		notify(fl, op->info.rv);
> +		notify(fl, (unsigned char)op->info.rv);
>  		goto out;
>  	}
>  
> diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
> index 2a61701..15532b9 100644
> --- a/fs/lockd/svclock.c
> +++ b/fs/lockd/svclock.c
> @@ -667,16 +667,16 @@ nlmsvc_cancel_blocked(struct net *net, struct nlm_file *file, struct nlm_lock *l
>   * deferred rpc for GETLK and SETLK.
>   */
>  static void
> -nlmsvc_update_deferred_block(struct nlm_block *block, int result)
> +nlmsvc_update_deferred_block(struct nlm_block *block, unsigned char type)
>  {
>  	block->b_flags |= B_GOT_CALLBACK;
> -	if (result == 0)
> +	if (type == 0)
>  		block->b_granted = 1;
>  	else
>  		block->b_flags |= B_TIMED_OUT;
>  }
>  
> -static int nlmsvc_grant_deferred(struct file_lock *fl, int result)
> +static int nlmsvc_grant_deferred(struct file_lock *fl, unsigned char type)
>  {
>  	struct nlm_block *block;
>  	int rc = -ENOENT;
> @@ -691,8 +691,8 @@ static int nlmsvc_grant_deferred(struct file_lock *fl, int result)
>  					rc = -ENOLCK;
>  					break;
>  				}
> -				nlmsvc_update_deferred_block(block, result);
> -			} else if (result == 0)
> +				nlmsvc_update_deferred_block(block, type);
> +			} else if (type == 0)
>  				block->b_granted = 1;
>  
>  			nlmsvc_insert_block_locked(block, 0);
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index d083a67..7fbce66 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -842,7 +842,7 @@ struct lock_manager_operations {
>  	int (*lm_compare_owner)(struct file_lock *fl1, struct file_lock *fl2);
>  	unsigned long (*lm_owner_key)(struct file_lock *fl);
>  	void (*lm_notify)(struct file_lock *fl);	/* unblock callback */
> -	int (*lm_grant)(struct file_lock *fl, int result);
> +	int (*lm_grant)(struct file_lock *fl, unsigned char type);
>  	void (*lm_break)(struct file_lock *fl);
>  	int (*lm_change)(struct file_lock **fl, int type);
>  };


-- 
Jeff Layton <jlayton poochiereds net>


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