[PATCH v5 03/22] cachefiles: introduce on-demand read mode

[Matthew Wilcox]

On Wed, Mar 16, 2022 at 09:17:04PM +0800, Jeffle Xu wrote:
> +#ifdef CONFIG_CACHEFILES_ONDEMAND
> +	struct xarray			reqs;		/* xarray of pending on-demand requests */
> +	rwlock_t			reqs_lock;	/* Lock for reqs xarray */

Why do you have a separate rwlock when the xarray already has its own
spinlock?  This is usually a really bad idea.