linux-kernel - Re: [PATCH] f2fs: separate IPU policy for fdatasync from F2FS_IPU

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Date:   Tue, 1 Nov 2022 23:14:55 +0800
From:   Chao Yu <chao@...nel.org>
To:     qixiaoyu1 <qxy65535@...il.com>, Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        qixiaoyu1 <qixiaoyu1@...omi.com>
Subject: Re: [PATCH] f2fs: separate IPU policy for fdatasync from
 F2FS_IPU_FSYNC

On 2022/10/21 10:31, qixiaoyu1 wrote:
> Currently IPU policy for fdatasync is coupled with F2FS_IPU_FSYNC.
> Fix to apply it to all IPU policy.

Xiaoyu,

Sorry for the delay.

I didn't get the point, can you please explain more about the
issue?

Thanks,

> 
> Signed-off-by: qixiaoyu1 <qixiaoyu1@...omi.com>
> ---
>   fs/f2fs/data.c | 8 +++-----
>   fs/f2fs/file.c | 4 +++-
>   2 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index a71e818cd67b..fec8e15fe820 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -2518,6 +2518,9 @@ static inline bool check_inplace_update_policy(struct inode *inode,
>   	if (policy & (0x1 << F2FS_IPU_HONOR_OPU_WRITE) &&
>   			is_inode_flag_set(inode, FI_OPU_WRITE))
>   		return false;
> +	/* this is set by fdatasync or F2FS_IPU_FSYNC policy */
> +	if (is_inode_flag_set(inode, FI_NEED_IPU))
> +		return true;
>   	if (policy & (0x1 << F2FS_IPU_FORCE))
>   		return true;
>   	if (policy & (0x1 << F2FS_IPU_SSR) && f2fs_need_SSR(sbi))
> @@ -2538,11 +2541,6 @@ static inline bool check_inplace_update_policy(struct inode *inode,
>   			!IS_ENCRYPTED(inode))
>   		return true;
>   
> -	/* this is only set during fdatasync */
> -	if (policy & (0x1 << F2FS_IPU_FSYNC) &&
> -			is_inode_flag_set(inode, FI_NEED_IPU))
> -		return true;
> -
>   	if (unlikely(fio && is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
>   			!f2fs_is_checkpointed_data(sbi, fio->old_blkaddr)))
>   		return true;
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 82cda1258227..08091550cdf2 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -270,8 +270,10 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
>   		goto go_write;
>   
>   	/* if fdatasync is triggered, let's do in-place-update */
> -	if (datasync || get_dirty_pages(inode) <= SM_I(sbi)->min_fsync_blocks)
> +	if (datasync || (SM_I(sbi)->ipu_policy & (0x1 << F2FS_IPU_FSYNC) &&
> +			get_dirty_pages(inode) <= SM_I(sbi)->min_fsync_blocks))
>   		set_inode_flag(inode, FI_NEED_IPU);
> +
>   	ret = file_write_and_wait_range(file, start, end);
>   	clear_inode_flag(inode, FI_NEED_IPU);
>