f2fs: clean up f2fs_may_encrypt()

Merge below two conditions into f2fs_may_encrypt() for cleanup
- IS_ENCRYPTED()
- DUMMY_ENCRYPTION_ENABLED()

Check IS_ENCRYPTED(inode) condition in f2fs_init_inode_metadata()
is enough since we have already set encrypt flag in f2fs_new_inode().
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

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 (IS_ENCRYPTED(inode)) {
 			err = fscrypt_inherit_context(dir, inode, page, false);
 			if (err)
 				goto put_error;

fs/f2fs/f2fs.h

@@ -3935,15 +3935,20 @@ 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)

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)) {