linux-kernel - Re: [PATCH v16 04/10] erofs: add erofs_inode_set

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Message-ID: <b20b263d-132b-464e-8314-d3f795e5e582@linux.alibaba.com>
Date: Thu, 22 Jan 2026 21:54:15 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Hongbo Li <lihongbo22@...wei.com>, chao@...nel.org, brauner@...nel.org
Cc: hch@....de, djwong@...nel.org, amir73il@...il.com,
 linux-fsdevel@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v16 04/10] erofs: add erofs_inode_set_aops helper to set
 the aops.



On 2026/1/22 21:37, Hongbo Li wrote:
> Add erofs_inode_set_aops helper to set the inode->i_mapping->a_ops,
> and using IS_ENABLED to make it cleaner.
> 
> Signed-off-by: Hongbo Li <lihongbo22@...wei.com>
> ---
>   fs/erofs/inode.c    | 23 +----------------------
>   fs/erofs/internal.h | 23 +++++++++++++++++++++++
>   2 files changed, 24 insertions(+), 22 deletions(-)
> 
> diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
> index bce98c845a18..389632bb46c4 100644
> --- a/fs/erofs/inode.c
> +++ b/fs/erofs/inode.c
> @@ -235,28 +235,7 @@ static int erofs_fill_inode(struct inode *inode)
>   	}
>   
>   	mapping_set_large_folios(inode->i_mapping);
> -	if (erofs_inode_is_data_compressed(vi->datalayout)) {
> -#ifdef CONFIG_EROFS_FS_ZIP
> -		DO_ONCE_LITE_IF(inode->i_blkbits != PAGE_SHIFT,
> -			  erofs_info, inode->i_sb,
> -			  "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
> -		inode->i_mapping->a_ops = &z_erofs_aops;
> -#else
> -		err = -EOPNOTSUPP;
> -#endif
> -	} else {
> -		inode->i_mapping->a_ops = &erofs_aops;
> -#ifdef CONFIG_EROFS_FS_ONDEMAND
> -		if (erofs_is_fscache_mode(inode->i_sb))
> -			inode->i_mapping->a_ops = &erofs_fscache_access_aops;
> -#endif
> -#ifdef CONFIG_EROFS_FS_BACKED_BY_FILE
> -		if (erofs_is_fileio_mode(EROFS_SB(inode->i_sb)))
> -			inode->i_mapping->a_ops = &erofs_fileio_aops;
> -#endif
> -	}
> -
> -	return err;
> +	return erofs_inode_set_aops(inode, inode, false);
>   }
>   
>   /*
> diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
> index ec79e8b44d3b..8e28c2fa8735 100644
> --- a/fs/erofs/internal.h
> +++ b/fs/erofs/internal.h
> @@ -455,6 +455,29 @@ static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count)
>   	return NULL;
>   }
>   
> +static inline int erofs_inode_set_aops(struct inode *inode,
> +				       struct inode *realinode, bool no_fscache)
> +{
> +	if (erofs_inode_is_data_compressed(EROFS_I(realinode)->datalayout)) {
> +		if (!IS_ENABLED(CONFIG_EROFS_FS_ZIP))
> +			return -EOPNOTSUPP;
> +		DO_ONCE_LITE_IF(realinode->i_blkbits != PAGE_SHIFT,
> +			  erofs_info, realinode->i_sb,
> +			  "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
> +		inode->i_mapping->a_ops = &z_erofs_aops;

Is that available if CONFIG_EROFS_FS_ZIP is undefined?

> +		return 0;
> +	}
> +	inode->i_mapping->a_ops = &erofs_aops;
> +	if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND)) {
> +		if (!no_fscache && erofs_is_fscache_mode(realinode->i_sb))
> +			inode->i_mapping->a_ops = &erofs_fscache_access_aops;
> +	} else {

I really don't think they are equal, could you just move
the code without any change?

Thanks,
Gao Xiang
> +		if (erofs_is_fileio_mode(EROFS_SB(realinode->i_sb)))
> +			inode->i_mapping->a_ops = &erofs_fileio_aops;
> +	}
> +	return 0;
> +}
> +
>   int erofs_register_sysfs(struct super_block *sb);
>   void erofs_unregister_sysfs(struct super_block *sb);
>   int __init erofs_init_sysfs(void);