[Libguestfs] [PATCH nbdkit] vddk: Add support for VIXDISKLIB_FLAG_OPEN_SINGLE_LINK

[Richard W.M. Jones]

From: Martin Kletzander <mkletzan at redhat.com>

Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
---
 plugins/vddk/nbdkit-vddk-plugin.pod |  7 ++++++-
 plugins/vddk/vddk-structs.h         |  1 +
 plugins/vddk/vddk.c                 | 10 ++++++++++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/plugins/vddk/nbdkit-vddk-plugin.pod b/plugins/vddk/nbdkit-vddk-plugin.pod
index 586aab4..25a6511 100644
--- a/plugins/vddk/nbdkit-vddk-plugin.pod
+++ b/plugins/vddk/nbdkit-vddk-plugin.pod
@@ -8,7 +8,7 @@ nbdkit-vddk-plugin - nbdkit VMware VDDK plugin
              [vm=moref=ID] [server=HOSTNAME] [user=USERNAME]
              [password=PASSWORD | password=- | password=+FILENAME]
              [cookie=COOKIE] [thumbprint=THUMBPRINT]
-             [port=PORT] [nfchostport=PORT]
+             [port=PORT] [nfchostport=PORT] [single-link=true]
              [snapshot=MOREF] [transports=MODE:MODE:...]
  nbdkit vddk --dump-plugin
 
@@ -128,6 +128,11 @@ Optional.  The port on the VCenter/ESXi host.  Defaults to 443.
 Optional (required for remote connections).  The hostname or IP
 address of VCenter or ESXi host.
 
+=item B<single-link=true>
+
+Optional.  Open the current link, not the entire chain.  This
+corresponds to the C<VIXDISKLIB_FLAG_OPEN_SINGLE_LINK> flag.
+
 =item B<snapshot=>MOREF
 
 Optional.  The Managed Object Reference of the snapshot.
diff --git a/plugins/vddk/vddk-structs.h b/plugins/vddk/vddk-structs.h
index 24b3259..bc68ac6 100644
--- a/plugins/vddk/vddk-structs.h
+++ b/plugins/vddk/vddk-structs.h
@@ -43,6 +43,7 @@
 typedef uint64_t VixError;
 #define VIX_OK 0
 
+#define VIXDISKLIB_FLAG_OPEN_SINGLE_LINK 2
 #define VIXDISKLIB_FLAG_OPEN_READ_ONLY 4
 #define VIXDISKLIB_SECTOR_SIZE 512
 
diff --git a/plugins/vddk/vddk.c b/plugins/vddk/vddk.c
index 8ea923a..78a4c88 100644
--- a/plugins/vddk/vddk.c
+++ b/plugins/vddk/vddk.c
@@ -91,6 +91,7 @@ static int nfc_host_port = 0;              /* nfchostport */
 static char *password = NULL;              /* password */
 static int port = 0;                       /* port */
 static const char *server_name = NULL;     /* server */
+static bool single_link = false;           /* single-link */
 static const char *snapshot_moref = NULL;  /* snapshot */
 static const char *thumb_print = NULL;     /* thumbprint */
 static const char *transport_modes = NULL; /* transports */
@@ -272,6 +273,13 @@ vddk_config (const char *key, const char *value)
   else if (strcmp (key, "vm") == 0) {
     vmx_spec = value;
   }
+  else if (strcmp (key, "single-link") == 0) {
+    int r = nbdkit_parse_bool (value);
+
+    if (r == -1)
+      return -1;
+    single_link = r;
+  }
   else {
     nbdkit_error ("unknown parameter '%s'", key);
     return -1;
@@ -464,6 +472,8 @@ vddk_open (int readonly)
   flags = 0;
   if (readonly)
     flags |= VIXDISKLIB_FLAG_OPEN_READ_ONLY;
+  if (single_link)
+    flags |= VIXDISKLIB_FLAG_OPEN_SINGLE_LINK;
 
   DEBUG_CALL ("VixDiskLib_Open",
               "connection, %s, %d, &handle", filename, flags);
-- 
2.20.1