[PATCH pve-storage] qcow2: resize: add preallocation support

[Alexandre Derumier]

Seem that we totally forgot to add it, it's available since 2017
https://www.mail-archive.com/qemu-devel@nongnu.org/msg436979.html
---
 src/PVE/Storage/Plugin.pm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/PVE/Storage/Plugin.pm b/src/PVE/Storage/Plugin.pm
index 6a6a804..d0ce3ae 100644
--- a/src/PVE/Storage/Plugin.pm
+++ b/src/PVE/Storage/Plugin.pm
@@ -1166,7 +1166,9 @@ sub volume_resize {
 
     my $format = ($class->parse_volname($volname))[6];
 
-    my $cmd = ['/usr/bin/qemu-img', 'resize', '-f', $format, $path , $size];
+    my $prealloc_opt = preallocation_cmd_option($scfg, $format);
+
+    my $cmd = ['/usr/bin/qemu-img', 'resize', "--$prealloc_opt", '-f', $format, $path , $size];
 
     run_command($cmd, timeout => 10);
 
-- 
2.39.5