2023-05-12 01:35:49

by Sijie Lan

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?

2023-05-17 02:47:44

by Chao Yu

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?
>
>
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