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

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Message-ID: <1035025.1647876652@warthog.procyon.org.uk>
Date:   Mon, 21 Mar 2022 15:30:52 +0000
From:   David Howells <dhowells@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     dhowells@...hat.com, JeffleXu <jefflexu@...ux.alibaba.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

Matthew Wilcox <willy@...radead.org> wrote:

> Absolutely; just use xa_lock() to protect both setting & testing the
> flag.

How should Jeffle deal with xarray dropping the lock internally in order to do
an allocation and then taking it again (actually in patch 5)?

David