[PATCH qemu-server v2 03/18] drive: introduce drive_uses_qsd_fuse() helper

[Fiona Ebner <f.ebner@proxmox.com>]

In preparation for supporting snapshot operations for drives which
are QSD FUSE exported. Having a central drive_uses_qsd_fuse() helper
makes it possible to consistently decide whether the QMP peer is the
QEMU storage daemon or the main QEMU instance.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---
 src/PVE/QemuServer.pm       |  7 +++----
 src/PVE/QemuServer/Drive.pm | 12 ++++++++++++
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/src/PVE/QemuServer.pm b/src/PVE/QemuServer.pm
index d87fc218..03a03efd 100644
--- a/src/PVE/QemuServer.pm
+++ b/src/PVE/QemuServer.pm
@@ -2828,12 +2828,11 @@ sub start_swtpm {
     my $tpm = parse_drive("tpmstate0", $tpmdrive);
     my ($storeid) = PVE::Storage::parse_volume_id($tpm->{file}, 1);
     if ($storeid) {
-        my $format = checked_volume_format($storecfg, $tpm->{file});
-        if ($format eq 'raw') {
-            $state = PVE::Storage::map_volume($storecfg, $tpm->{file});
-        } else {
+        if (PVE::QemuServer::Drive::drive_uses_qsd_fuse($storecfg, $tpm)) {
             PVE::QemuServer::QSD::start($vmid);
             $state = PVE::QemuServer::QSD::add_fuse_export($vmid, $tpm, 'tpmstate0');
+        } else {
+            $state = PVE::Storage::map_volume($storecfg, $tpm->{file});
         }
     } else {
         $state = $tpm->{file};
diff --git a/src/PVE/QemuServer/Drive.pm b/src/PVE/QemuServer/Drive.pm
index 10106ebd..f88504b2 100644
--- a/src/PVE/QemuServer/Drive.pm
+++ b/src/PVE/QemuServer/Drive.pm
@@ -1152,4 +1152,16 @@ sub detect_zeroes_cmdline_option {
     return 'on';
 }
 
+sub drive_uses_qsd_fuse {
+    my ($storecfg, $drive) = @_;
+
+    if ($drive->{interface} eq 'tpmstate') {
+        my ($storeid) = PVE::Storage::parse_volume_id($drive->{file}, 1);
+        my $format = checked_volume_format($storecfg, $drive->{file});
+        return $storeid && $format ne 'raw';
+    }
+
+    return;
+}
+
 1;
-- 
2.47.3