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

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Message-ID: <YjiAVezd5B9auhcP@casper.infradead.org>
Date:   Mon, 21 Mar 2022 13:40:37 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc:     dhowells@...hat.com, linux-cachefs@...hat.com, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        torvalds@...ux-foundation.org, gregkh@...uxfoundation.org,
        linux-fsdevel@...r.kernel.org, joseph.qi@...ux.alibaba.com,
        bo.liu@...ux.alibaba.com, tao.peng@...ux.alibaba.com,
        gerry@...ux.alibaba.com, eguan@...ux.alibaba.com,
        linux-kernel@...r.kernel.org, luodaowen.backend@...edance.com
Subject: Re: [PATCH v5 03/22] cachefiles: introduce on-demand read mode

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.