f2fs: call f2fs_unlock_op after error was handled

This patch relocates f2fs_unlock_op in every directory operations to be called
after any error was processed.
Otherwise, the checkpoint can be entered with valid node ids without its
dentry when -ENOSPC is occurred.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -1194,6 +1194,7 @@ void update_inode(struct inode *, struct page *);
 void update_inode_page(struct inode *);
 int f2fs_write_inode(struct inode *, struct writeback_control *);
 void f2fs_evict_inode(struct inode *);
+void handle_failed_inode(struct inode *);
 
 /*
  * namei.c

fs/f2fs/inode.c

@@ -306,3 +306,26 @@ void f2fs_evict_inode(struct inode *inode)
 out_clear:
 	clear_inode(inode);
 }
+
+/* caller should call f2fs_lock_op() */
+void handle_failed_inode(struct inode *inode)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+
+	clear_nlink(inode);
+	make_bad_inode(inode);
+	unlock_new_inode(inode);
+
+	i_size_write(inode, 0);
+	if (F2FS_HAS_BLOCKS(inode))
+		f2fs_truncate(inode);
+
+	remove_inode_page(inode);
+	stat_dec_inline_inode(inode);
+
+	alloc_nid_failed(sbi, inode->i_ino);
+	f2fs_unlock_op(sbi);
+
+	/* iput will drop the inode object */
+	iput(inode);
+}

fs/f2fs/namei.c

@@ -123,9 +123,9 @@ static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 
 	f2fs_lock_op(sbi);
 	err = f2fs_add_link(dentry, inode);
-	f2fs_unlock_op(sbi);
 	if (err)
 		goto out;
+	f2fs_unlock_op(sbi);
 
 	alloc_nid_done(sbi, ino);
 
@@ -133,9 +133,7 @@ static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 	unlock_new_inode(inode);
 	return 0;
 out:
-	clear_nlink(inode);
-	iget_failed(inode);
-	alloc_nid_failed(sbi, ino);
+	handle_failed_inode(inode);
 	return err;
 }
 
@@ -154,15 +152,16 @@ static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 	f2fs_lock_op(sbi);
 	err = f2fs_add_link(dentry, inode);
-	f2fs_unlock_op(sbi);
 	if (err)
 		goto out;
+	f2fs_unlock_op(sbi);
 
 	d_instantiate(dentry, inode);
 	return 0;
 out:
 	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 	iput(inode);
+	f2fs_unlock_op(sbi);
 	return err;
 }
 
@@ -253,9 +252,9 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 
 	f2fs_lock_op(sbi);
 	err = f2fs_add_link(dentry, inode);
-	f2fs_unlock_op(sbi);
 	if (err)
 		goto out;
+	f2fs_unlock_op(sbi);
 
 	err = page_symlink(inode, symname, symlen);
 	alloc_nid_done(sbi, inode->i_ino);
@@ -264,9 +263,7 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 	unlock_new_inode(inode);
 	return err;
 out:
-	clear_nlink(inode);
-	iget_failed(inode);
-	alloc_nid_failed(sbi, inode->i_ino);
+	handle_failed_inode(inode);
 	return err;
 }
 
@@ -290,9 +287,9 @@ static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 	f2fs_lock_op(sbi);
 	err = f2fs_add_link(dentry, inode);
-	f2fs_unlock_op(sbi);
 	if (err)
 		goto out_fail;
+	f2fs_unlock_op(sbi);
 
 	alloc_nid_done(sbi, inode->i_ino);
 
@@ -303,9 +300,7 @@ static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 
 out_fail:
 	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
-	clear_nlink(inode);
-	iget_failed(inode);
-	alloc_nid_failed(sbi, inode->i_ino);
+	handle_failed_inode(inode);
 	return err;
 }
 
@@ -338,18 +333,16 @@ static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 
 	f2fs_lock_op(sbi);
 	err = f2fs_add_link(dentry, inode);
-	f2fs_unlock_op(sbi);
 	if (err)
 		goto out;
+	f2fs_unlock_op(sbi);
 
 	alloc_nid_done(sbi, inode->i_ino);
 	d_instantiate(dentry, inode);
 	unlock_new_inode(inode);
 	return 0;
 out:
-	clear_nlink(inode);
-	iget_failed(inode);
-	alloc_nid_failed(sbi, inode->i_ino);
+	handle_failed_inode(inode);
 	return err;
 }
 
@@ -677,10 +670,7 @@ static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 release_out:
 	release_orphan_inode(sbi);
 out:
-	f2fs_unlock_op(sbi);
-	clear_nlink(inode);
-	iget_failed(inode);
-	alloc_nid_failed(sbi, inode->i_ino);
+	handle_failed_inode(inode);
 	return err;
 }