linux-kernel - Is compression available under direct-io mode?

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Message-ID: <CAGAHmYC8AR_iw=nXQc6s29T3SkSoz9Ajd0N39Nv87orJJHMLGQ@mail.gmail.com>
Date:   Thu, 11 May 2023 21:10:36 -0400
From:   Sijie Lan <sijielan@...il.com>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Is compression available under direct-io mode?

Hi, guys,

When I do some specific test scenarios, I want to do some direct write
after data have been compressed in F2FS, but when I track the internal
functions, it seems F2FS forces my direct-io request to buffer-io
mode. Does it mean we can not do the write direct-io if we applied the
compression feature? In other words, must f2fs use an inside buffer to
provide compression functions?