[PATCH] erofs-utils: dump: add some superblock fields display

[Gao Xiang]

Hi Xuenan,

On 2023/6/6 11:55, Guo Xuenan wrote:
> dump.erofs show compression algothrims and sb_exslots,

			     ^ algorithms and sb_extslots

> and update feature information.
> 
> th current super block info displayed as follows:

The proposed super block info is shown as below:

> Filesystem magic number:                      0xE0F5E1E2
> Filesystem blocks:                            4637
> Filesystem inode metadata start block:        0
> Filesystem shared xattr metadata start block: 0
> Filesystem root nid:                          37
> Filesystem compr_algs:                        lz4 lzma
> Filesystem sb_extslots:                       0
> Filesystem inode count:                       36
> Filesystem created:                           Tue Jun  6 10:23:02 2023
> Filesystem features:                          sb_csum mtime lz4_0padding compr_cfgs big_pcluster
> Filesystem UUID:                              not available
> 
> Signed-off-by: Guo Xuenan <guoxuenan at huawei.com>
> ---
>   dump/main.c              | 34 +++++++++++++++++++++++++++++++++-
>   include/erofs/internal.h |  1 +
>   lib/super.c              |  5 +++++
>   3 files changed, 39 insertions(+), 1 deletion(-)
> 
> diff --git a/dump/main.c b/dump/main.c
> index efbc82b..20e1456 100644
> --- a/dump/main.c
> +++ b/dump/main.c
> @@ -93,13 +93,25 @@ struct erofsdump_feature {
>   static struct erofsdump_feature feature_lists[] = {
>   	{ true, EROFS_FEATURE_COMPAT_SB_CHKSUM, "sb_csum" },
>   	{ true, EROFS_FEATURE_COMPAT_MTIME, "mtime" },
> -	{ false, EROFS_FEATURE_INCOMPAT_LZ4_0PADDING, "0padding" },
> +	{ false, EROFS_FEATURE_INCOMPAT_LZ4_0PADDING, "lz4_0padding" },

Better to keep it as is (see kernel code.)

> +	{ false, EROFS_FEATURE_INCOMPAT_COMPR_CFGS, "compr_cfgs" },
>   	{ false, EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER, "big_pcluster" },
>   	{ false, EROFS_FEATURE_INCOMPAT_CHUNKED_FILE, "chunked_file" },
>   	{ false, EROFS_FEATURE_INCOMPAT_DEVICE_TABLE, "device_table" },
>   	{ false, EROFS_FEATURE_INCOMPAT_ZTAILPACKING, "ztailpacking" },
>   	{ false, EROFS_FEATURE_INCOMPAT_FRAGMENTS, "fragments" },
>   	{ false, EROFS_FEATURE_INCOMPAT_DEDUPE, "dedupe" },
> +	{ false, EROFS_FEATURE_INCOMPAT_XATTR_PREFIXES, "xattr_prefixes" },
> +};
> +
> +struct available_alg {
> +	int type;
> +	const char *name;
> +};

Could we use lib/compressor.c instead?

Thanks,
Gao Xiang