linux-kernel - Re: [RFC PATCH v5] f2fs: support data compression

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Message-ID: <CAMuHMdWnOCOqNCNnrsdNw4q3vG-Htm3bPBngqFJ8Frk8m13ytQ@mail.gmail.com>
Date:   Thu, 19 Dec 2019 11:18:09 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>,
        linux-f2fs-devel@...ts.sourceforge.net,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Chao Yu <chao@...nel.org>
Subject: Re: [RFC PATCH v5] f2fs: support data compression

Hi,

On Mon, Dec 16, 2019 at 7:29 AM Chao Yu <yuchao0@...wei.com> wrote:
> This patch tries to support compression in f2fs.

> --- a/fs/f2fs/Kconfig
> +++ b/fs/f2fs/Kconfig
> @@ -92,3 +92,26 @@ config F2FS_FAULT_INJECTION
>           Test F2FS to inject faults such as ENOMEM, ENOSPC, and so on.
>
>           If unsure, say N.
> +
> +config F2FS_FS_COMPRESSION
> +       bool "F2FS compression feature"
> +       depends on F2FS_FS
> +       help
> +         Enable filesystem-level compression on f2fs regular files,
> +         multiple back-end compression algorithms are supported.
> +
> +config F2FS_FS_LZO
> +       bool "LZO compression support" if F2FS_FS_COMPRESSION

This should depend on F2FS_FS_COMPRESSION, instead of just hiding
the question, to avoid the option always being enabled when
F2FS_FS_COMPRESSION is not set:

        bool "LZO compression support"
        depends on F2FS_FS_COMPRESSION

> +       select LZO_COMPRESS
> +       select LZO_DECOMPRESS
> +       default y
> +       help
> +         Support LZO compress algorithm, if unsure, say Y.
> +
> +config F2FS_FS_LZ4
> +       bool "LZ4 compression support" if F2FS_FS_COMPRESSION

Likewise.

> +       select LZ4_COMPRESS
> +       select LZ4_DECOMPRESS
> +       default y
> +       help
> +         Support LZ4 compress algorithm, if unsure, say Y.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds