linux-kernel - Re: [PATCH 1/2] erofs: get rid of name from struct z_erofs

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Date:   Wed, 26 Apr 2023 14:08:49 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     Yue Hu <zbestahu@...il.com>, xiang@...nel.org, chao@...nel.org,
        linux-erofs@...ts.ozlabs.org
Cc:     jefflexu@...ux.alibaba.com, huyue2@...lpad.com,
        linux-kernel@...r.kernel.org, zhangwen@...lpad.com
Subject: Re: [PATCH 1/2] erofs: get rid of name from struct
 z_erofs_decompressor



On 2023/4/26 12:10, Yue Hu wrote:
> From: Yue Hu <huyue2@...lpad.com>
> 
> There are no users of the name and we can get this via ->alg if needed.
> Also, move struct z_erofs_decompressor into decompressor.c which is the
> only one to use it.
> 
> Signed-off-by: Yue Hu <huyue2@...lpad.com>

I'd like to avoid z_erofs_decompress() function instead honestly.
name strings might be useful if users would like to get runtime
supported algorithms.

Thanks,
Gao Xiang

> ---
>   fs/erofs/compress.h     | 6 ------
>   fs/erofs/decompressor.c | 9 +++++----
>   2 files changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/fs/erofs/compress.h b/fs/erofs/compress.h
> index 26fa170090b8..d161683bda03 100644
> --- a/fs/erofs/compress.h
> +++ b/fs/erofs/compress.h
> @@ -20,12 +20,6 @@ struct z_erofs_decompress_req {
>   	bool inplace_io, partial_decoding, fillgaps;
>   };
>   
> -struct z_erofs_decompressor {
> -	int (*decompress)(struct z_erofs_decompress_req *rq,
> -			  struct page **pagepool);
> -	char *name;
> -};
> -
>   /* some special page->private (unsigned long, see below) */
>   #define Z_EROFS_SHORTLIVED_PAGE		(-1UL << 2)
>   #define Z_EROFS_PREALLOCATED_PAGE	(-2UL << 2)
> diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
> index 7021e2cf6146..f416ebd6f0dc 100644
> --- a/fs/erofs/decompressor.c
> +++ b/fs/erofs/decompressor.c
> @@ -363,23 +363,24 @@ static int z_erofs_transform_plain(struct z_erofs_decompress_req *rq,
>   	return 0;
>   }
>   
> +struct z_erofs_decompressor {
> +	int (*decompress)(struct z_erofs_decompress_req *rq,
> +			  struct page **pagepool);
> +};
> +
>   static struct z_erofs_decompressor decompressors[] = {
>   	[Z_EROFS_COMPRESSION_SHIFTED] = {
>   		.decompress = z_erofs_transform_plain,
> -		.name = "shifted"
>   	},
>   	[Z_EROFS_COMPRESSION_INTERLACED] = {
>   		.decompress = z_erofs_transform_plain,
> -		.name = "interlaced"
>   	},
>   	[Z_EROFS_COMPRESSION_LZ4] = {
>   		.decompress = z_erofs_lz4_decompress,
> -		.name = "lz4"
>   	},
>   #ifdef CONFIG_EROFS_FS_ZIP_LZMA
>   	[Z_EROFS_COMPRESSION_LZMA] = {
>   		.decompress = z_erofs_lzma_decompress,
> -		.name = "lzma"
>   	},
>   #endif
>   };