linux-kernel - Re: [f2fs-dev] Is compression available under direct-io mode?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Wed, 17 May 2023 10:32:00 +0800
From:   Chao Yu <chao@...nel.org>
To:     Sijie Lan <sijielan@...il.com>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] Is compression available under direct-io mode?

On 2023/5/12 9:10, Sijie Lan wrote:
> 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

Yes, compression feature depends on page cache.

Thanks,

> compression feature? In other words, must f2fs use an inside buffer to
> provide compression functions?
> 
> 
> _______________________________________________
> Linux-f2fs-devel mailing list
> Linux-f2fs-devel@...ts.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel