file-restore: increase lock timeout on QEMU map

This lock is held during VM startup, so that multiple calls will not
start VMs twice. But this means that the timeout needs to incorporate
the time it might take a VM to boot, so increase it quite a bit.

This could previously lead to "interrupted system call" errors when
accessing backups with many disks.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
(cherry picked from commit 66501529a2)
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/bin/proxmox_file_restore/block_driver_qemu.rs

@@ -50,7 +50,7 @@ impl VMStateMap {
     /// Acquire a lock on the state map and retrieve a deserialized version
     fn load() -> Result<Self, Error> {
         let mut file = Self::open_file_raw(true)?;
-        lock_file(&mut file, true, Some(std::time::Duration::from_secs(5)))?;
+        lock_file(&mut file, true, Some(std::time::Duration::from_secs(120)))?;
         let map = serde_json::from_reader(&file).unwrap_or_default();
         Ok(Self { map, file })
     }