[PATCH v5 1/2] erofs: add sysfs interface

[Gao Xiang]

On Fri, Nov 12, 2021 at 06:10:37PM +0800, Huang Jianan wrote:
> 在 2021/11/12 13:36, Gao Xiang 写道:
> > Hi Jianan,
> > 
> > On Fri, Nov 12, 2021 at 10:30:02AM +0800, Huang Jianan wrote:
> > > Add sysfs interface to configure erofs related parameters later.
> > > 
> > > Signed-off-by: Huang Jianan <huangjianan at oppo.com>
> > > Reviewed-by: Chao Yu <chao at kernel.org>
> > > ---
> > > since v4:
> > > - Resend in a clean chain.
> > > 
> > > since v3:
> > > - Add description of sysfs in erofs documentation.
> > > 
> > > since v2:
> > > - Check whether t in erofs_attr_store is illegal.
> > > - Print raw value for bool entry.
> > > 
> > > since v1:
> > > - Add sysfs API documentation.
> > > - Use sysfs_emit over snprintf.
> > > 
> > >   Documentation/ABI/testing/sysfs-fs-erofs |   7 +
> > >   Documentation/filesystems/erofs.rst      |   8 +
> > >   fs/erofs/Makefile                        |   2 +-
> > >   fs/erofs/internal.h                      |  10 +
> > >   fs/erofs/super.c                         |  12 ++
> > >   fs/erofs/sysfs.c                         | 240 +++++++++++++++++++++++
> > >   6 files changed, 278 insertions(+), 1 deletion(-)
> > >   create mode 100644 Documentation/ABI/testing/sysfs-fs-erofs
> > >   create mode 100644 fs/erofs/sysfs.c
> > > 
> > > diff --git a/Documentation/ABI/testing/sysfs-fs-erofs b/Documentation/ABI/testing/sysfs-fs-erofs
> > > new file mode 100644
> > > index 000000000000..86d0d0234473
> > > --- /dev/null
> > > +++ b/Documentation/ABI/testing/sysfs-fs-erofs
> > > @@ -0,0 +1,7 @@
> > > +What:		/sys/fs/erofs/features/
> > > +Date:		November 2021
> > > +Contact:	"Huang Jianan" <huangjianan at oppo.com>
> > > +Description:	Shows all enabled kernel features.
> > > +		Supported features:
> > > +		lz4_0padding, compr_cfgs, big_pcluster, device_table,
> > > +		sb_chksum.
> > Please help submit a patch renaming lz4_0padding to 0padding globally
> > since LZMA and later algorithms also need that...
> > 
> > Also, lack of chunked_file and compr_head2 as well?
> 
> It seems that these features are also missing in internal.h, I will send a
> new
> patchset containing these fixes.

Yeah, these were not used before, but as you're introducing the sysfs
directories, they need to be filled up.

Thanks,
Gao Xiang

> 
> Thanks,
> Jianan
> 
> > Thanks,
> > Gao Xiang