From 86a31183e9fc14e2204322878d7e9673be6a0c36 Mon Sep 17 00:00:00 2001
From: bapt <bapt@FreeBSD.org>
Date: Fri, 27 May 2016 11:46:54 +0000
Subject: [PATCH] Improve error message when failing to open a backing file

When bhyve cannot open a backing file, it now says explicitly which file
could not be opened

Note that the change has only be maed in block_if.c and not in
pci_virtio_block.c as the error will always be catched by the first

PR:		202321 (different patch)
Reviewed by:	grehan
MFC after:	3 day
Sponsored by:	Gandi.net
Differential Revision:	https://reviews.freebsd.org/D6576
---
 usr.sbin/bhyve/block_if.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/usr.sbin/bhyve/block_if.c b/usr.sbin/bhyve/block_if.c
index b6cb4090e47b..187d178d0d0c 100644
--- a/usr.sbin/bhyve/block_if.c
+++ b/usr.sbin/bhyve/block_if.c
@@ -37,6 +37,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/disk.h>
 
 #include <assert.h>
+#include <err.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -447,12 +448,12 @@ blockif_open(const char *optstr, const char *ident)
 	}
 
 	if (fd < 0) {
-		perror("Could not open backing file");
+		warn("Could not open backing file: %s", nopt);
 		goto err;
 	}
 
         if (fstat(fd, &sbuf) < 0) {
-                perror("Could not stat backing file");
+		warn("Could not stat backing file %s", nopt);
 		goto err;
         }