fs/ntfs3: handle attr_set_size() errors when truncating files

If attr_set_size() fails while truncating down, the error is silently
ignored and the inode may be left in an inconsistent state.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Author: aalexandrovich

fs/ntfs3/file.c

@@ -505,8 +505,8 @@ static int ntfs_truncate(struct inode *inode, loff_t new_size)
 {
 	struct super_block *sb = inode->i_sb;
 	struct ntfs_inode *ni = ntfs_i(inode);
-	int err, dirty = 0;
 	u64 new_valid;
+	int err;
 
 	if (!S_ISREG(inode->i_mode))
 		return 0;
@@ -522,7 +522,6 @@ static int ntfs_truncate(struct inode *inode, loff_t new_size)
 	}
 
 	new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
-
 	truncate_setsize(inode, new_size);
 
 	ni_lock(ni);
@@ -536,20 +535,19 @@ static int ntfs_truncate(struct inode *inode, loff_t new_size)
 		ni->i_valid = new_valid;
 
 	ni_unlock(ni);
+	if (unlikely(err))
+		return err;
 
 	ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
 	inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 	if (!IS_DIRSYNC(inode)) {
-		dirty = 1;
+		mark_inode_dirty(inode);
 	} else {
 		err = ntfs_sync_inode(inode);
 		if (err)
 			return err;
 	}
 
-	if (dirty)
-		mark_inode_dirty(inode);
-
 	return 0;
 }