f2fs: introduce f2fs_do_tmpfile for code consistency

This patch adds f2fs_do_tmpfile to eliminate the redundant init_inode_metadata
flow.
Throught this, we can provide the consistent lock usage, e.g., fi->i_sem,  and
this will enable better debugging stuffs.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/dir.c

@@ -337,8 +337,7 @@ static struct page *init_inode_metadata(struct inode *inode,
 	struct page *page;
 	int err;
 
-	if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE) &&
-			inode->i_nlink) {
+	if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
 		page = new_inode_page(inode, name);
 		if (IS_ERR(page))
 			return page;
@@ -364,7 +363,8 @@ static struct page *init_inode_metadata(struct inode *inode,
 		set_cold_node(inode, page);
 	}
 
-	init_dent_inode(name, page);
+	if (name)
+		init_dent_inode(name, page);
 
 	/*
 	 * This file should be checkpointed during fsync.
@@ -537,6 +537,27 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name,
 	return err;
 }
 
+int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
+{
+	struct page *page;
+	int err = 0;
+
+	down_write(&F2FS_I(inode)->i_sem);
+	page = init_inode_metadata(inode, dir, NULL);
+	if (IS_ERR(page)) {
+		err = PTR_ERR(page);
+		goto fail;
+	}
+	/* we don't need to mark_inode_dirty now */
+	update_inode(inode, page);
+	f2fs_put_page(page, 1);
+
+	clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
+fail:
+	up_write(&F2FS_I(inode)->i_sem);
+	return err;
+}
+
 /*
  * It only removes the dentry from the dentry page,corresponding name
  * entry in name page does not need to be touched during deletion.

fs/f2fs/f2fs.h

@@ -1136,6 +1136,7 @@ void f2fs_set_link(struct inode *, struct f2fs_dir_entry *,
 int update_dent_inode(struct inode *, const struct qstr *);
 int __f2fs_add_link(struct inode *, const struct qstr *, struct inode *);
 void f2fs_delete_entry(struct f2fs_dir_entry *, struct page *, struct inode *);
+int f2fs_do_tmpfile(struct inode *, struct inode *);
 int f2fs_make_empty(struct inode *, struct inode *);
 bool f2fs_empty_dir(struct inode *);
 

fs/f2fs/namei.c

@@ -493,7 +493,6 @@ static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 	struct super_block *sb = dir->i_sb;
 	struct f2fs_sb_info *sbi = F2FS_SB(sb);
 	struct inode *inode;
-	struct page *page;
 	int err;
 
 	inode = f2fs_new_inode(dir, mode);
@@ -508,38 +507,25 @@ static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 	err = acquire_orphan_inode(sbi);
 	if (err)
 		goto out;
+
+	err = f2fs_do_tmpfile(inode, dir);
+	if (err)
+		goto release_out;
+
 	/*
 	 * add this non-linked tmpfile to orphan list, in this way we could
 	 * remove all unused data of tmpfile after abnormal power-off.
 	 */
 	add_orphan_inode(sbi, inode->i_ino);
-
-	page = new_inode_page(inode, NULL);
-	if (IS_ERR(page)) {
-		err = PTR_ERR(page);
-		goto remove_out;
-	}
-
-	err = f2fs_init_acl(inode, dir, page);
-	if (err)
-		goto unlock_out;
-
-	err = f2fs_init_security(inode, dir, NULL, page);
-	if (err)
-		goto unlock_out;
-
-	f2fs_put_page(page, 1);
 	f2fs_unlock_op(sbi);
 
 	alloc_nid_done(sbi, inode->i_ino);
-	mark_inode_dirty(inode);
 	d_tmpfile(dentry, inode);
 	unlock_new_inode(inode);
 	return 0;
-unlock_out:
-	f2fs_put_page(page, 1);
-remove_out:
-	remove_orphan_inode(sbi, inode->i_ino);
+
+release_out:
+	release_orphan_inode(sbi);
 out:
 	f2fs_unlock_op(sbi);
 	clear_nlink(inode);