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    SubjectRe: [PATCH v5 1/2] erofs: add sysfs interface
    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@oppo.com>
    > Reviewed-by: Chao Yu <chao@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@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

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