[PATCH v6 1/2] erofs-utils: lib: introduce erofs_xattr_prefix_index()

[Gao Xiang]

On 2024/9/6 16:38, Hongzhen Luo wrote:
> Prepare for the feature of exporting extended attributes for
> `fsck.erofs`, which requires obtaining the index based on the
> name of the extended attribute.
> 
> Signed-off-by: Hongzhen Luo <hongzhen at linux.alibaba.com>
> ---
>   include/erofs/xattr.h | 2 ++
>   lib/xattr.c           | 7 +++++++
>   2 files changed, 9 insertions(+)
> 
> diff --git a/include/erofs/xattr.h b/include/erofs/xattr.h
> index 7643611..7848fe7 100644
> --- a/include/erofs/xattr.h
> +++ b/include/erofs/xattr.h
> @@ -61,6 +61,8 @@ void erofs_clear_opaque_xattr(struct erofs_inode *inode);
>   int erofs_set_origin_xattr(struct erofs_inode *inode);
>   int erofs_read_xattrs_from_disk(struct erofs_inode *inode);
>   
> +int erofs_xattr_prefix_index(const char *key);
> +
>   #ifdef __cplusplus
>   }
>   #endif
> diff --git a/lib/xattr.c b/lib/xattr.c
> index 9f31f2d..1fed7c0 100644
> --- a/lib/xattr.c
> +++ b/lib/xattr.c
> @@ -1681,3 +1681,10 @@ out:
>   		erofs_xattr_prefixes_cleanup(sbi);
>   	return ret;
>   }
> +
> +int erofs_xattr_prefix_index(const char *key)
> +{
> +	unsigned int index, len;
> +
> +	return match_prefix(key, &index, &len) ? index : -EINVAL;

Can we export match_prefix as erofs_xattr_match_prefix()
directly?

Thanks,
Gao Xiang

> +}