Re: [PATCH 14/18] virtiofs: Add a fuse_iqueue operation to put() reference

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On Thu, Sep 05, 2019 at 03:48:55PM -0400, Vivek Goyal wrote:
> diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
> index 85e2dcad68c1..04e2c000d63f 100644
> --- a/fs/fuse/fuse_i.h
> +++ b/fs/fuse/fuse_i.h
> @@ -479,6 +479,11 @@ struct fuse_iqueue_ops {
>  	 */
>  	void (*wake_pending_and_unlock)(struct fuse_iqueue *fiq)
>  		__releases(fiq->waitq.lock);
> +
> +	/**
> +	 * Put a reference on fiq_priv.

I'm a bit confused about fiq->priv's role in this.  The callback takes
struct fuse_iqueue *fiq as the argument, not void *priv, so it could
theoretically do more than just release priv.

I think one of the following would be clearer:

 /**
  * Drop a reference to fiq->priv.
  */
 void (*put_priv)(void *priv);

Or:

 /**
  * Clean up when fuse_iqueue is destroyed.
  */
 void (*release)(struct fuse_iqueue *fiq);

In the second case fuse_conn_put() shouldn't check fiq->priv.

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