staging: erofs: remove unneeded inode_operations

Currently, EROFS uses generic iops when xattr is off,
it seems unnecessary and a lot of extra code is there.
Let's follow what other filesystems do instead.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/erofs/inode.c

@@ -184,32 +184,18 @@ static int fill_inode(struct inode *inode, int isdir)
 	if (!err) {
 		/* setup the new inode */
 		if (S_ISREG(inode->i_mode)) {
-#ifdef CONFIG_EROFS_FS_XATTR
-			inode->i_op = &erofs_generic_xattr_iops;
-#endif
+			inode->i_op = &erofs_generic_iops;
 			inode->i_fop = &generic_ro_fops;
 		} else if (S_ISDIR(inode->i_mode)) {
-			inode->i_op =
-#ifdef CONFIG_EROFS_FS_XATTR
-				&erofs_dir_xattr_iops;
-#else
-				&erofs_dir_iops;
-#endif
+			inode->i_op = &erofs_dir_iops;
 			inode->i_fop = &erofs_dir_fops;
 		} else if (S_ISLNK(inode->i_mode)) {
 			/* by default, page_get_link is used for symlink */
-			inode->i_op =
-#ifdef CONFIG_EROFS_FS_XATTR
-				&erofs_symlink_xattr_iops,
-#else
-				&page_symlink_inode_operations;
-#endif
+			inode->i_op = &erofs_symlink_iops;
 			inode_nohighmem(inode);
 		} else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 			S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
-#ifdef CONFIG_EROFS_FS_XATTR
-			inode->i_op = &erofs_special_inode_operations;
-#endif
+			inode->i_op = &erofs_generic_iops;
 			init_special_inode(inode, inode->i_mode, inode->i_rdev);
 		} else {
 			err = -EIO;
@@ -297,23 +283,23 @@ struct inode *erofs_iget(struct super_block *sb,
 	return inode;
 }
 
+const struct inode_operations erofs_generic_iops = {
 #ifdef CONFIG_EROFS_FS_XATTR
-const struct inode_operations erofs_generic_xattr_iops = {
 	.listxattr = erofs_listxattr,
+#endif
 };
 
-const struct inode_operations erofs_symlink_xattr_iops = {
+const struct inode_operations erofs_symlink_iops = {
 	.get_link = page_get_link,
+#ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
+#endif
 };
 
-const struct inode_operations erofs_special_inode_operations = {
-	.listxattr = erofs_listxattr,
-};
-
-const struct inode_operations erofs_fast_symlink_xattr_iops = {
+const struct inode_operations erofs_fast_symlink_iops = {
 	.get_link = simple_get_link,
+#ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
-};
 #endif
+};
 

drivers/staging/erofs/internal.h

@@ -414,8 +414,6 @@ static inline bool is_inode_layout_inline(struct inode *inode)
 }
 
 extern const struct super_operations erofs_sops;
-extern const struct inode_operations erofs_dir_iops;
-extern const struct file_operations erofs_dir_fops;
 
 extern const struct address_space_operations erofs_raw_access_aops;
 #ifdef CONFIG_EROFS_FS_ZIP
@@ -559,37 +557,33 @@ static inline unsigned long erofs_inode_hash(erofs_nid_t nid)
 extern struct inode *erofs_iget(struct super_block *sb,
 	erofs_nid_t nid, bool dir);
 
-/* dir.c */
-int erofs_namei(struct inode *dir, struct qstr *name,
-	erofs_nid_t *nid, unsigned *d_type);
-
-#ifdef CONFIG_EROFS_FS_XATTR
-/* xattr.c */
-extern const struct xattr_handler *erofs_xattr_handlers[];
-
-/* symlink and special inode */
-extern const struct inode_operations erofs_symlink_xattr_iops;
-extern const struct inode_operations erofs_fast_symlink_xattr_iops;
-extern const struct inode_operations erofs_special_inode_operations;
-#endif
+extern const struct inode_operations erofs_generic_iops;
+extern const struct inode_operations erofs_symlink_iops;
+extern const struct inode_operations erofs_fast_symlink_iops;
 
 static inline void set_inode_fast_symlink(struct inode *inode)
 {
-#ifdef CONFIG_EROFS_FS_XATTR
-	inode->i_op = &erofs_fast_symlink_xattr_iops;
-#else
-	inode->i_op = &simple_symlink_inode_operations;
-#endif
+	inode->i_op = &erofs_fast_symlink_iops;
 }
 
 static inline bool is_inode_fast_symlink(struct inode *inode)
 {
+	return inode->i_op == &erofs_fast_symlink_iops;
+}
+
+/* namei.c */
+extern const struct inode_operations erofs_dir_iops;
+
+int erofs_namei(struct inode *dir, struct qstr *name,
+		erofs_nid_t *nid, unsigned int *d_type);
+
+/* dir.c */
+extern const struct file_operations erofs_dir_fops;
+
 #ifdef CONFIG_EROFS_FS_XATTR
-	return inode->i_op == &erofs_fast_symlink_xattr_iops;
-#else
-	return inode->i_op == &simple_symlink_inode_operations;
+/* xattr.c */
+extern const struct xattr_handler *erofs_xattr_handlers[];
 #endif
-}
 
 static inline void *erofs_vmap(struct page **pages, unsigned int count)
 {

drivers/staging/erofs/namei.c

@@ -235,10 +235,6 @@ static struct dentry *erofs_lookup(struct inode *dir,
 
 const struct inode_operations erofs_dir_iops = {
 	.lookup = erofs_lookup,
-};
-
-const struct inode_operations erofs_dir_xattr_iops = {
-	.lookup = erofs_lookup,
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif

drivers/staging/erofs/xattr.h

@@ -68,10 +68,6 @@ static const struct xattr_handler *xattr_handler_map[] = {
 }
 
 #ifdef CONFIG_EROFS_FS_XATTR
-
-extern const struct inode_operations erofs_generic_xattr_iops;
-extern const struct inode_operations erofs_dir_xattr_iops;
-
 int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
 ssize_t erofs_listxattr(struct dentry *, char *, size_t);
 #else