linux-kernel - Re: [PATCH] f2fs: clean up f2fs_may

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Date:   Fri, 20 Mar 2020 12:07:59 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     jaegeuk@...nel.org, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH] f2fs: clean up f2fs_may_encrypt()

On Fri, Mar 20, 2020 at 06:18:31PM +0800, Chao Yu wrote:
> Merge below two conditions into f2fs_may_encrypt() for cleanup
> - IS_ENCRYPTED()
> - DUMMY_ENCRYPTION_ENABLED()
> 
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
>  fs/f2fs/dir.c   |  4 +---
>  fs/f2fs/f2fs.h  | 13 +++++++++----
>  fs/f2fs/namei.c |  4 +---
>  3 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
> index 0971ccc4664a..2accfc5e38d0 100644
> --- a/fs/f2fs/dir.c
> +++ b/fs/f2fs/dir.c
> @@ -471,7 +471,6 @@ struct page *f2fs_init_inode_metadata(struct inode *inode, struct inode *dir,
>  			struct page *dpage)
>  {
>  	struct page *page;
> -	int dummy_encrypt = DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(dir));
>  	int err;
>  
>  	if (is_inode_flag_set(inode, FI_NEW_INODE)) {
> @@ -498,8 +497,7 @@ struct page *f2fs_init_inode_metadata(struct inode *inode, struct inode *dir,
>  		if (err)
>  			goto put_error;
>  
> -		if ((IS_ENCRYPTED(dir) || dummy_encrypt) &&
> -					f2fs_may_encrypt(inode)) {
> +		if (f2fs_may_encrypt(dir, inode)) {
>  			err = fscrypt_inherit_context(dir, inode, page, false);
>  			if (err)
>  				goto put_error;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 09db79a20f8e..fcafa68212eb 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3946,15 +3946,20 @@ static inline bool f2fs_lfs_mode(struct f2fs_sb_info *sbi)
>  	return F2FS_OPTION(sbi).fs_mode == FS_MODE_LFS;
>  }
>  
> -static inline bool f2fs_may_encrypt(struct inode *inode)
> +static inline bool f2fs_may_encrypt(struct inode *dir, struct inode *inode)
>  {
>  #ifdef CONFIG_FS_ENCRYPTION
> +	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
>  	umode_t mode = inode->i_mode;
>  
> -	return (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode));
> -#else
> -	return false;
> +	/*
> +	 * If the directory encrypted or dummy encryption enabled,
> +	 * then we should encrypt the inode.
> +	 */
> +	if (IS_ENCRYPTED(dir) || DUMMY_ENCRYPTION_ENABLED(sbi))
> +		return (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode));
>  #endif
> +	return false;
>  }
>  
>  static inline bool f2fs_may_compress(struct inode *inode)
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index b75c70813f9e..95cfbce062e8 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -75,9 +75,7 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
>  
>  	set_inode_flag(inode, FI_NEW_INODE);
>  
> -	/* If the directory encrypted, then we should encrypt the inode. */
> -	if ((IS_ENCRYPTED(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
> -				f2fs_may_encrypt(inode))
> +	if (f2fs_may_encrypt(dir, inode))
>  		f2fs_set_encrypted_inode(inode);
>  
>  	if (f2fs_sb_has_extra_attr(sbi)) {
> -- 

Can't f2fs_init_inode_metadata() just check IS_ENCRYPTED(inode) instead?
(inode, not dir.)  The encrypt flag was already set by f2fs_new_inode(), right?

If so, then f2fs_may_encrypt() would only have one caller and it could be
inlined into f2fs_new_inode(), similar to __ext4_new_inode().

- Eric