commit e2a9d9a39d55fc3a0df387df05497b4b47d2dd83
author Daniel P. Berrange <berrange@redhat.com> Wed Feb 10 18:41:07 2016 +0000
committer Paolo Bonzini <pbonzini@redhat.com> Tue Feb 16 17:14:33 2016 +0100
tree 4de6f340bb74a85d908e85881a87b825514b5763
parent 26afa868dbd8641070c0a8d851b082b603c04fa1

nbd: make client request fixed new style if advertised

If the server advertises support for the fixed new style
negotiation, the client should in turn enable new style.
This will allow the client to negotiate further NBD
options besides the export name.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1455129674-17255-10-git-send-email-berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

nbd/client.c

diff --git a/nbd/client.c b/nbd/client.c
index 5064788..88f2ada 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -76,7 +76,6 @@
 {
     char buf[256];
     uint64_t magic, s;
-    uint16_t tmp;
     int rc;
 
     TRACE("Receiving negotiation.");
@@ -117,19 +116,26 @@
     TRACE("Magic is 0x%" PRIx64, magic);
 
     if (magic == NBD_OPTS_MAGIC) {
-        uint32_t reserved = 0;
+        uint32_t clientflags = 0;
         uint32_t opt;
         uint32_t namesize;
+        uint16_t globalflags;
+        uint16_t exportflags;
 
-        if (read_sync(ioc, &tmp, sizeof(tmp)) != sizeof(tmp)) {
+        if (read_sync(ioc, &globalflags, sizeof(globalflags)) !=
+            sizeof(globalflags)) {
             error_setg(errp, "Failed to read server flags");
             goto fail;
         }
-        *flags = be16_to_cpu(tmp) << 16;
-        /* reserved for future use */
-        if (write_sync(ioc, &reserved, sizeof(reserved)) !=
-            sizeof(reserved)) {
-            error_setg(errp, "Failed to read reserved field");
+        *flags = be16_to_cpu(globalflags) << 16;
+        if (globalflags & NBD_FLAG_FIXED_NEWSTYLE) {
+            TRACE("Server supports fixed new style");
+            clientflags |= NBD_FLAG_C_FIXED_NEWSTYLE;
+        }
+        /* client requested flags */
+        if (write_sync(ioc, &clientflags, sizeof(clientflags)) !=
+            sizeof(clientflags)) {
+            error_setg(errp, "Failed to send clientflags field");
             goto fail;
         }
         /* write the export name */
@@ -165,11 +171,12 @@
         *size = be64_to_cpu(s);
         TRACE("Size is %" PRIu64, *size);
 
-        if (read_sync(ioc, &tmp, sizeof(tmp)) != sizeof(tmp)) {
+        if (read_sync(ioc, &exportflags, sizeof(exportflags)) !=
+            sizeof(exportflags)) {
             error_setg(errp, "Failed to read export flags");
             goto fail;
         }
-        *flags |= be16_to_cpu(tmp);
+        *flags |= be16_to_cpu(exportflags);
     } else if (magic == NBD_CLIENT_MAGIC) {
         if (name) {
             error_setg(errp, "Server does not support export names");