linux-kernel - RE: [PATCH 3/3] exfat: replace memcpy with structure assignment

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Date:   Wed, 16 Sep 2020 11:23:11 +0900
From:   "Sungjong Seo" <sj1557.seo@...sung.com>
To:     "'Tetsuhiro Kohada'" <kohada.t2@...il.com>
Cc:     <kohada.tetsuhiro@...mitsubishielectric.co.jp>,
        <mori.takahiro@...mitsubishielectric.co.jp>,
        <motai.hirotaka@...mitsubishielectric.co.jp>,
        "'Namjae Jeon'" <namjae.jeon@...sung.com>,
        <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/3] exfat: replace memcpy with structure assignment

> Use structure assignment instead of memcpy.
> 
> Signed-off-by: Tetsuhiro Kohada <kohada.t2@...il.com>

Acked-by: Sungjong Seo <sj1557.seo@...sung.com>

> ---
>  fs/exfat/dir.c   |  7 ++-----
>  fs/exfat/inode.c |  2 +-
>  fs/exfat/namei.c | 15 +++++++--------
>  3 files changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c index
> fa5bb72aa295..8520decd120c 100644
> --- a/fs/exfat/dir.c
> +++ b/fs/exfat/dir.c
> @@ -974,11 +974,8 @@ int exfat_find_dir_entry(struct super_block *sb,
> struct exfat_inode_info *ei,
>  					if (ei->hint_femp.eidx ==
>  							EXFAT_HINT_NONE ||
>  						candi_empty.eidx <=
> -							 ei->hint_femp.eidx)
{
> -						memcpy(&ei->hint_femp,
> -							&candi_empty,
> -
sizeof(candi_empty));
> -					}
> +							 ei->hint_femp.eidx)
> +						ei->hint_femp = candi_empty;
>  				}
> 
>  				brelse(bh);
> diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c index
> 70a33d4807c3..687f77653187 100644
> --- a/fs/exfat/inode.c
> +++ b/fs/exfat/inode.c
> @@ -554,7 +554,7 @@ static int exfat_fill_inode(struct inode *inode,
> struct exfat_dir_entry *info)
>  	struct exfat_inode_info *ei = EXFAT_I(inode);
>  	loff_t size = info->size;
> 
> -	memcpy(&ei->dir, &info->dir, sizeof(struct exfat_chain));
> +	ei->dir = info->dir;
>  	ei->entry = info->entry;
>  	ei->attr = info->attr;
>  	ei->start_clu = info->start_clu;
> diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c index
> 1c433491f771..2932b23a3b6c 100644
> --- a/fs/exfat/namei.c
> +++ b/fs/exfat/namei.c
> @@ -318,8 +318,7 @@ static int exfat_find_empty_entry(struct inode *inode,
>  	hint_femp.eidx = EXFAT_HINT_NONE;
> 
>  	if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
> -		memcpy(&hint_femp, &ei->hint_femp,
> -				sizeof(struct exfat_hint_femp));
> +		hint_femp = ei->hint_femp;
>  		ei->hint_femp.eidx = EXFAT_HINT_NONE;
>  	}
> 
> @@ -519,7 +518,7 @@ static int exfat_add_entry(struct inode *inode, const
> char *path,
>  	if (ret)
>  		goto out;
> 
> -	memcpy(&info->dir, p_dir, sizeof(struct exfat_chain));
> +	info->dir = *p_dir;
>  	info->entry = dentry;
>  	info->flags = ALLOC_NO_FAT_CHAIN;
>  	info->type = type;
> @@ -625,7 +624,7 @@ static int exfat_find(struct inode *dir, struct qstr
> *qname,
>  	if (dentry < 0)
>  		return dentry; /* -error value */
> 
> -	memcpy(&info->dir, &cdir.dir, sizeof(struct exfat_chain));
> +	info->dir = cdir;
>  	info->entry = dentry;
>  	info->num_subdirs = 0;
> 
> @@ -1030,7 +1029,7 @@ static int exfat_rename_file(struct inode *inode,
> struct exfat_chain *p_dir,
>  		if (!epnew)
>  			return -EIO;
> 
> -		memcpy(epnew, epold, DENTRY_SIZE);
> +		*epnew = *epold;
>  		if (exfat_get_entry_type(epnew) == TYPE_FILE) {
>  			epnew->dentry.file.attr |=
cpu_to_le16(ATTR_ARCHIVE);
>  			ei->attr |= ATTR_ARCHIVE;
> @@ -1050,7 +1049,7 @@ static int exfat_rename_file(struct inode *inode,
> struct exfat_chain *p_dir,
>  			return -EIO;
>  		}
> 
> -		memcpy(epnew, epold, DENTRY_SIZE);
> +		*epnew = *epold;
>  		exfat_update_bh(new_bh, sync);
>  		brelse(old_bh);
>  		brelse(new_bh);
> @@ -1113,7 +1112,7 @@ static int exfat_move_file(struct inode *inode,
> struct exfat_chain *p_olddir,
>  	if (!epnew)
>  		return -EIO;
> 
> -	memcpy(epnew, epmov, DENTRY_SIZE);
> +	*epnew = *epmov;
>  	if (exfat_get_entry_type(epnew) == TYPE_FILE) {
>  		epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
>  		ei->attr |= ATTR_ARCHIVE;
> @@ -1133,7 +1132,7 @@ static int exfat_move_file(struct inode *inode,
> struct exfat_chain *p_olddir,
>  		return -EIO;
>  	}
> 
> -	memcpy(epnew, epmov, DENTRY_SIZE);
> +	*epnew = *epmov;
>  	exfat_update_bh(new_bh, IS_DIRSYNC(inode));
>  	brelse(mov_bh);
>  	brelse(new_bh);
> --
> 2.25.1