Re: [PATCH 1/1] f2fs: merge equivalent flags F2FS_GET_BLOCK_[READ|DIO]

[Chao Yu <yuchao0@huawei.com>]

On 2017/8/8 18:27, sunqiuyang wrote:
> From: Qiuyang Sun <sunqiuyang@huawei.com>
> 
> Currently, the two flags F2FS_GET_BLOCK_[READ|DIO] are totally equivalent
> and can be used interchangably in all scenarios they are involved in. This
> patch deletes F2FS_GET_BLOCK_READ and uses F2FS_GET_BLOCK_DIO instead.

Seems weird from readability point of view, so how about keeping
F2FS_GET_BLOCK_READ alive but sharing defined value with F2FS_GET_BLOCK_DIO?

enum {
	F2FS_GET_BLOCK_DIO,
	F2FS_GET_BLOCK_READ = F2FS_GET_BLOCK_DIO,
	F2FS_GET_BLOCK_FIEMAP,
	...
}

Thanks,

> 
> Signed-off-by: Qiuyang Sun <sunqiuyang@huawei.com>
> ---
>  fs/f2fs/data.c | 2 +-
>  fs/f2fs/f2fs.h | 1 -
>  fs/f2fs/file.c | 4 ++--
>  3 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index c43262d..e0a59bf 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1244,7 +1244,7 @@ static int f2fs_mpage_readpages(struct address_space *mapping,
>  			map.m_len = last_block - block_in_file;
>  
>  			if (f2fs_map_blocks(inode, &map, 0,
> -						F2FS_GET_BLOCK_READ))
> +						F2FS_GET_BLOCK_DIO))
>  				goto set_error_page;
>  		}
>  got_it:
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index cea329f..0593ca7 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -514,7 +514,6 @@ struct f2fs_map_blocks {
>  };
>  
>  /* for flag in get_data_block */
> -#define F2FS_GET_BLOCK_READ		0
>  #define F2FS_GET_BLOCK_DIO		1
>  #define F2FS_GET_BLOCK_FIEMAP		2
>  #define F2FS_GET_BLOCK_BMAP		3
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index e2b33b8..8271cb5 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2074,7 +2074,7 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
>  	 */
>  	while (map.m_lblk < pg_end) {
>  		map.m_len = pg_end - map.m_lblk;
> -		err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_READ);
> +		err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DIO);
>  		if (err)
>  			goto out;
>  
> @@ -2116,7 +2116,7 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
>  
>  do_map:
>  		map.m_len = pg_end - map.m_lblk;
> -		err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_READ);
> +		err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DIO);
>  		if (err)
>  			goto clear_out;
>  
>