From 79b55514fca8d87b67cc924a5a85c2f25a49946d Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <mars@box>
Date: Sat, 4 Apr 2020 23:09:49 +0200
Subject: [PATCH] copy: stop upon short read

---
 kernel/mars_copy.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/mars_copy.c b/kernel/mars_copy.c
index 0be2b033..f91ce2ad 100644
--- a/kernel/mars_copy.c
+++ b/kernel/mars_copy.c
@@ -771,6 +771,9 @@ int _run_copy(struct copy_brick *brick, loff_t this_start)
 			count += st->len;
 			// check contiguity
 			if (unlikely(GET_OFFSET(pos) + st->len != COPY_CHUNK)) {
+				/* Short read detected: shorten the copy_end.
+				 */
+				brick->copy_end = pos + st->len;
 				break;
 			}
 		}