linux-kernel - Re: [PATCH 2/3] f2fs: zone: allow IPU for regular file in regular block device

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Message-ID: <ZxbhUUuKx_zaWAx4@google.com>
Date: Mon, 21 Oct 2024 23:18:41 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] f2fs: zone: allow IPU for regular file in regular
 block device

On 10/18, Chao Yu wrote:
> blkzoned feature enables lfs mode by default, for data updates from
> regular file, it only allow to use OPU, this patch changes to allow
> to use IPU if regular file's data block locates in regular block
> device, if data block locates in zoned block device, it still uses
> OPU.
> 
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
>  fs/f2fs/data.c | 12 ++++++++++--
>  fs/f2fs/f2fs.h |  5 +++++
>  2 files changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 949b6bb957c7..c6d0e4aa12e3 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -2648,8 +2648,16 @@ bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio)
>  		return false;
>  	if (fio && is_sbi_flag_set(sbi, SBI_NEED_FSCK))
>  		return true;
> -	if (f2fs_lfs_mode(sbi))
> -		return true;
> +	if (f2fs_lfs_mode(sbi)) {
> +		/* no regular block device in mainarea */
> +		if (!f2fs_blkzoned_has_regular_section(sbi))
> +			return true;
> +		/* blkaddr locates in sequential zone */
> +		if (fio && __is_valid_data_blkaddr(fio->old_blkaddr) &&
> +			GET_SEGNO(sbi, fio->old_blkaddr) >=
> +					sbi->first_zoned_segno)

What if there's another regular device beyond zoned partition?
I prefer to keep the entire area as lfs mode to simplify the performance.
Do we really need IPU on conventional partition? Why not asking to use
file pinning, if someone needs IPU?

> +			return true;
> +	}
>  	if (S_ISDIR(inode->i_mode))
>  		return true;
>  	if (IS_NOQUOTA(inode))
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 55bcd411257a..6781b4fab43f 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -4790,6 +4790,11 @@ static inline void f2fs_invalidate_internal_cache(struct f2fs_sb_info *sbi,
>  	f2fs_invalidate_compress_page(sbi, blkaddr);
>  }
>  
> +static inline bool f2fs_blkzoned_has_regular_section(struct f2fs_sb_info *sbi)
> +{
> +	return f2fs_sb_has_blkzoned(sbi) && sbi->first_zoned_segno;
> +}
> +
>  #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
>  #define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
>  
> -- 
> 2.40.1