Jaegeuk, Got it.
Eric, Yep. 2020년 11월 24일 (화) 오전 3:46, Eric Biggers <ebigg...@kernel.org>님이 작성: > > On Mon, Nov 23, 2020 at 12:17:50PM +0900, Daeho Jeong wrote: > > From: Daeho Jeong <daehoje...@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 <daehoje...@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
