dedup

commit f08d3792bd0dc9154b8a0e09b339d9d80845b71f
parent d0cf858ff772267664f2286a69e133972f00520d
Author: sin <sin@2f30.org>
Date:   Thu,  7 Mar 2019 17:17:51 +0000

Detect short reads

This can happen if the store is truncated.

Diffstat:
M
dedup.c
 | 
9
+++++++--

1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/dedup.c b/dedup.c
@@ -211,9 +211,14 @@ hash_blk(uint8_t *buf, size_t size, uint8_t *md)
 static void
 read_blk(uint8_t *buf, struct blk_desc *blk_desc)
 {
+	ssize_t n;
+
 	xlseek(sfd, blk_desc->offset, SEEK_SET);
-	if (xread(sfd, buf, blk_desc->size) == 0)
-		errx(1, "read: unexpected EOF");
+	n = xread(sfd, buf, blk_desc->size);
+	if (n == 0)
+		errx(1, "read_blk: unexpected EOF");
+	if (n != blk_desc->size)
+		errx(1, "read_blk: short read");
 }
 
 static void