From ef92307fd49e75482c7599caf68685afc1807512 Mon Sep 17 00:00:00 2001
From: Manuel Bentele
Date: Fri, 6 Nov 2020 12:44:43 +0100
Subject: [KERNEL, CLIENT]: submit and probe multiple dnbd3-server with ioctl
 OPEN

The ioctl OPEN call for DNBD3 devices exposed by the dnbd3 Linux kernel
module, is extended with a fixed array of dnbd3 hosts. The fixed array
allows the dnbd3-client to submit host information (IP address and port)
of multiple dnbd3-servers. This information is used to probe all
submitted dnbd3-servers and add them to the alternative dnbd3-server
list. If at least one dnbd3-server is not reachable, the OPEN ioctl call
will abort with an error code.
---
 inc/dnbd3/types.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'inc')

diff --git a/inc/dnbd3/types.h b/inc/dnbd3/types.h
index 63e182c..59bf2d1 100644
--- a/inc/dnbd3/types.h
+++ b/inc/dnbd3/types.h
@@ -128,10 +128,14 @@ typedef struct __attribute__((packed)) dnbd3_host_t
 	dnbd3_af type;        // 1byte (ip version. HOST_IP4 or HOST_IP6. 0 means this struct is empty and should be ignored)
 } dnbd3_host_t;
 
+/* IOCTLs */
+#define MAX_HOSTS_PER_IOCTL NUMBER_SERVERS
+
 typedef struct __attribute__((packed))
 {
 	uint16_t len;
-	dnbd3_host_t host;
+	dnbd3_host_t hosts[MAX_HOSTS_PER_IOCTL];
+	uint8_t hosts_num;
 	uint16_t imgnamelen;
 	char *imgname;
 	int rid;
-- 
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