udf: Propagate errors from udf_truncate_extents()

Make udf_truncate_extents() properly propagate errors to its callers and
let udf_setsize() handle the error properly as well. This lets userspace
know in case there's some error when truncating blocks.

Signed-off-by: Jan Kara <[e-mail]>

fs/udf/inode.c

···
 		truncate_setsize(inode, newsize);
 		down_write(&iinfo->i_data_sem);
 		udf_clear_extent_cache(inode);
-		udf_truncate_extents(inode);
+		err = udf_truncate_extents(inode);
 		up_write(&iinfo->i_data_sem);
+		if (err)
+			return err;
 	}
 update_time:
 	inode->i_mtime = inode->i_ctime = current_time(inode);

fs/udf/truncate.c

···
  * for making file shorter. For making file longer, udf_extend_file() has to
  * be used.
  */
-void udf_truncate_extents(struct inode *inode)
+int udf_truncate_extents(struct inode *inode)
 {
 	struct extent_position epos;
 	struct kernel_lb_addr eloc, neloc = {};
···
 	if (etype == -1) {
 		/* We should extend the file? */
 		WARN_ON(byte_offset);
-		return;
+		return 0;
 	}
 	epos.offset -= adsize;
 	extent_trunc(inode, &epos, &eloc, etype, elen, byte_offset);
···
 					udf_get_lb_pblock(sb, &eloc, 0));
 			/* Error reading indirect block? */
 			if (!epos.bh)
-				return;
+				return -EIO;
 			if (elen)
 				indirect_ext_len =
 					(elen + sb->s_blocksize - 1) >>
···
 	iinfo->i_lenExtents = inode->i_size;
 
 	brelse(epos.bh);
+	return 0;
 }

fs/udf/udfdecl.h

···
 /* truncate.c */
 extern void udf_truncate_tail_extent(struct inode *);
 extern void udf_discard_prealloc(struct inode *);
-extern void udf_truncate_extents(struct inode *);
+extern int udf_truncate_extents(struct inode *);
 
 /* balloc.c */
 extern void udf_free_blocks(struct super_block *, struct inode *,