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

[Gao Xiang]

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?

Thanks,
Gao Xiang