[PATCH qemu-server v3 2/11] fix #6370: virtiofs: add support for thread-pool-size option

[Markus Frank <m.frank@proxmox.com>]

Allows tuning the number of worker threads used by virtiofsd.

Signed-off-by: Markus Frank <m.frank@proxmox.com>
---
v3 changes:
* added defined() to post-if

 src/PVE/QemuServer/Virtiofs.pm | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/PVE/QemuServer/Virtiofs.pm b/src/PVE/QemuServer/Virtiofs.pm
index b181db5f..ba8b0dab 100644
--- a/src/PVE/QemuServer/Virtiofs.pm
+++ b/src/PVE/QemuServer/Virtiofs.pm
@@ -60,6 +60,14 @@ my $virtiofs_fmt = {
         default => 0,
         optional => 1,
     },
+    'thread-pool-size' => {
+        type => 'integer',
+        description => "Controls the maximum number of worker threads used by virtiofsd to"
+            . " handle requests. A value of '0' disables the thread pool.",
+        default => 0,
+        minimum => 0,
+        optional => 1,
+    },
 };
 PVE::JSONSchema::register_format('pve-qm-virtiofs', $virtiofs_fmt);
 
@@ -180,6 +188,8 @@ sub start_virtiofsd {
             my $cmd = [$virtiofsd_bin, "--fd=$fd", "--shared-dir=$path"];
             push @$cmd, '--xattr' if $virtiofs->{'expose-xattr'};
             push @$cmd, '--posix-acl' if $virtiofs->{'expose-acl'};
+            push @$cmd, '--thread-pool-size=' . $virtiofs->{'thread-pool-size'}
+                if defined($virtiofs->{'thread-pool-size'});
             push @$cmd, '--announce-submounts';
             push @$cmd, '--allow-direct-io' if $virtiofs->{'direct-io'};
             push @$cmd, '--cache=' . $virtiofs->{cache} if $virtiofs->{cache};
-- 
2.47.3