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SubjectRe: [f2fs-dev] [PATCH 1/2] f2fs: add compress_mode mount option
On Mon, Nov 23, 2020 at 12:17:50PM +0900, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@google.com>
>
> We will add a new "compress_mode" mount option to control file
> compression mode. This supports "fs-based" and "user-based".
> In "fs-based" mode (default), f2fs does automatic compression on
> the compression enabled files. In "user-based" mode, f2fs disables
> the automaic compression and gives the user discretion of choosing
> the target file and the timing. It means the user can do manual
> compression/decompression on the compression enabled files using ioctls.
>
> Signed-off-by: Daeho Jeong <daehojeong@google.com>
> ---
> Documentation/filesystems/f2fs.rst | 7 +++++++
> fs/f2fs/data.c | 10 +++++-----
> fs/f2fs/f2fs.h | 30 ++++++++++++++++++++++++++++++
> fs/f2fs/segment.c | 2 +-
> fs/f2fs/super.c | 23 +++++++++++++++++++++++
> 5 files changed, 66 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
> index b8ee761c9922..0679c53d5012 100644
> --- a/Documentation/filesystems/f2fs.rst
> +++ b/Documentation/filesystems/f2fs.rst
> @@ -260,6 +260,13 @@ compress_extension=%s Support adding specified extension, so that f2fs can enab
> For other files, we can still enable compression via ioctl.
> Note that, there is one reserved special extension '*', it
> can be set to enable compression for all files.
> +compress_mode=%s Control file compression mode. This supports "fs-based" and
> + "user-based". In "fs-based" mode (default), f2fs does
> + automatic compression on the compression enabled files.
> + In "user-based" mode, f2fs disables the automaic compression
> + and gives the user discretion of choosing the target file and
> + the timing. The user can do manual compression/decompression
> + on the compression enabled files using ioctls.

Please clarify in the documentation what it means for compression-enabled files
to not be compressed. It is not obvious.

- Eric

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