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From:   "Sungjong Seo" <sj1557.seo@samsung.com>
To:     "'Namjae Jeon'" <linkinjeon@kernel.org>
Cc:     <linux-kernel@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
        <sj1557.seo@samsung.com>
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Subject: RE: [PATCH 2/2] exfat: remove exfat_update_parent_info()
Date:   Fri, 1 Apr 2022 19:34:13 +0900
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> exfat_update_parent_info() is a workaround for the wrong parent directory
> information being used after renaming. Now that bug is fixed, this is no
> longer needed, so remove it.
> 
> Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
> Reviewed-by: Andy Wu <Andy.Wu@sony.com>
> Reviewed-by: Aoyama Wataru <wataru.aoyama@sony.com>
> Reviewed-by: Daniel Palmer <daniel.palmer@sony.com>

As you said, exfat_update_parent_info() seems to be a workaround
that exists from the legacy code to resolve the inconsistency of
parent node information.

Thanks for your patch!
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>

> ---
>  fs/exfat/namei.c | 26 --------------------------
>  1 file changed, 26 deletions(-)
> 
> diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c index
> e7adb6bfd9d5..76acc3721951 100644
> --- a/fs/exfat/namei.c
> +++ b/fs/exfat/namei.c
> @@ -1168,28 +1168,6 @@ static int exfat_move_file(struct inode *inode,
> struct exfat_chain *p_olddir,
>  	return 0;
>  }
> 
> -static void exfat_update_parent_info(struct exfat_inode_info *ei,
> -		struct inode *parent_inode)
> -{
> -	struct exfat_sb_info *sbi = EXFAT_SB(parent_inode->i_sb);
> -	struct exfat_inode_info *parent_ei = EXFAT_I(parent_inode);
> -	loff_t parent_isize = i_size_read(parent_inode);
> -
> -	/*
> -	 * the problem that struct exfat_inode_info caches wrong parent
> info.
> -	 *
> -	 * because of flag-mismatch of ei->dir,
> -	 * there is abnormal traversing cluster chain.
> -	 */
> -	if (unlikely(parent_ei->flags != ei->dir.flags ||
> -		     parent_isize != EXFAT_CLU_TO_B(ei->dir.size, sbi) ||
> -		     parent_ei->start_clu != ei->dir.dir)) {
> -		exfat_chain_set(&ei->dir, parent_ei->start_clu,
> -			EXFAT_B_TO_CLU_ROUND_UP(parent_isize, sbi),
> -			parent_ei->flags);
> -	}
> -}
> -
>  /* rename or move a old file into a new file */  static int
> __exfat_rename(struct inode *old_parent_inode,
>  		struct exfat_inode_info *ei, struct inode *new_parent_inode,
> @@ -1220,8 +1198,6 @@ static int __exfat_rename(struct inode
> *old_parent_inode,
>  		return -ENOENT;
>  	}
> 
> -	exfat_update_parent_info(ei, old_parent_inode);
> -
>  	exfat_chain_dup(&olddir, &ei->dir);
>  	dentry = ei->entry;
> 
> @@ -1242,8 +1218,6 @@ static int __exfat_rename(struct inode
> *old_parent_inode,
>  			goto out;
>  		}
> 
> -		exfat_update_parent_info(new_ei, new_parent_inode);
> -
>  		p_dir = &(new_ei->dir);
>  		new_entry = new_ei->entry;
>  		ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh);
> --
> 2.25.1