f2fs: handle f2fs_truncate error correctly

This patch fixes to return error number of f2fs_truncate, so that we
can handle the error correctly in callers.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -1595,7 +1595,7 @@ static inline bool f2fs_may_extent_tree(struct inode *inode)
 int f2fs_sync_file(struct file *, loff_t, loff_t, int);
 void truncate_data_blocks(struct dnode_of_data *);
 int truncate_blocks(struct inode *, u64, bool);
-void f2fs_truncate(struct inode *, bool);
+int f2fs_truncate(struct inode *, bool);
 int f2fs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 int f2fs_setattr(struct dentry *, struct iattr *);
 int truncate_hole(struct inode *, pgoff_t, pgoff_t);

fs/f2fs/file.c

@@ -579,24 +579,30 @@ int truncate_blocks(struct inode *inode, u64 from, bool lock)
 	return err;
 }
 
-void f2fs_truncate(struct inode *inode, bool lock)
+int f2fs_truncate(struct inode *inode, bool lock)
 {
+	int err;
+
 	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 				S_ISLNK(inode->i_mode)))
-		return;
+		return 0;
 
 	trace_f2fs_truncate(inode);
 
 	/* we should check inline_data size */
 	if (f2fs_has_inline_data(inode) && !f2fs_may_inline_data(inode)) {
-		if (f2fs_convert_inline_inode(inode))
-			return;
+		err = f2fs_convert_inline_inode(inode);
+		if (err)
+			return err;
 	}
 
-	if (!truncate_blocks(inode, i_size_read(inode), lock)) {
+	err = truncate_blocks(inode, i_size_read(inode), lock);
+	if (err)
+		return err;
+
 	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 	mark_inode_dirty(inode);
-	}
+	return 0;
 }
 
 int f2fs_getattr(struct vfsmount *mnt,
@@ -656,7 +662,9 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 
 		if (attr->ia_size <= i_size_read(inode)) {
 			truncate_setsize(inode, attr->ia_size);
-			f2fs_truncate(inode, true);
+			err = f2fs_truncate(inode, true);
+			if (err)
+				return err;
 			f2fs_balance_fs(F2FS_I_SB(inode));
 		} else {
 			/*