f2fs: code cleanup by removing ifdef macro surrounding

Define f2fs_listxattr and to NULL when CONFIG_F2FS_FS_XATTR is not
enabled, then we can remove many ugly ifdef macros in the code.
Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -979,9 +979,7 @@ const struct inode_operations f2fs_file_inode_operations = {
 	.setattr	= f2fs_setattr,
 	.get_acl	= f2fs_get_acl,
 	.set_acl	= f2fs_set_acl,
-#ifdef CONFIG_F2FS_FS_XATTR
 	.listxattr	= f2fs_listxattr,
-#endif
 	.fiemap		= f2fs_fiemap,
 };
 

fs/f2fs/namei.c

@@ -1287,9 +1287,7 @@ const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
 	.get_link       = f2fs_encrypted_get_link,
 	.getattr	= f2fs_getattr,
 	.setattr	= f2fs_setattr,
-#ifdef CONFIG_F2FS_FS_XATTR
 	.listxattr	= f2fs_listxattr,
-#endif
 };
 
 const struct inode_operations f2fs_dir_inode_operations = {
@@ -1307,9 +1305,7 @@ const struct inode_operations f2fs_dir_inode_operations = {
 	.setattr	= f2fs_setattr,
 	.get_acl	= f2fs_get_acl,
 	.set_acl	= f2fs_set_acl,
-#ifdef CONFIG_F2FS_FS_XATTR
 	.listxattr	= f2fs_listxattr,
-#endif
 	.fiemap		= f2fs_fiemap,
 };
 
@@ -1317,9 +1313,7 @@ const struct inode_operations f2fs_symlink_inode_operations = {
 	.get_link       = f2fs_get_link,
 	.getattr	= f2fs_getattr,
 	.setattr	= f2fs_setattr,
-#ifdef CONFIG_F2FS_FS_XATTR
 	.listxattr	= f2fs_listxattr,
-#endif
 };
 
 const struct inode_operations f2fs_special_inode_operations = {
@@ -1327,7 +1321,5 @@ const struct inode_operations f2fs_special_inode_operations = {
 	.setattr        = f2fs_setattr,
 	.get_acl	= f2fs_get_acl,
 	.set_acl	= f2fs_set_acl,
-#ifdef CONFIG_F2FS_FS_XATTR
 	.listxattr	= f2fs_listxattr,
-#endif
 };

fs/f2fs/xattr.h

@@ -136,6 +136,7 @@ extern void f2fs_destroy_xattr_caches(struct f2fs_sb_info *);
 #else
 
 #define f2fs_xattr_handlers	NULL
+#define f2fs_listxattr		NULL
 static inline int f2fs_setxattr(struct inode *inode, int index,
 		const char *name, const void *value, size_t size,
 		struct page *page, int flags)
@@ -148,11 +149,6 @@ static inline int f2fs_getxattr(struct inode *inode, int index,
 {
 	return -EOPNOTSUPP;
 }
-static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
-		size_t buffer_size)
-{
-	return -EOPNOTSUPP;
-}
 static inline int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi) { return 0; }
 static inline void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi) { }
 #endif