[pve-devel] [PATCH storage 01/10] api: disks: create: re-check disk after fork/lock

[Fabian Ebner]

Because then it might not be unused anymore. If there really is a
race, this prevents e.g. sgdisk creating a partition on a device
already in use by LVM or LVM destroying a partitioned device.

For ZFS, also get the latest udev info once inside the worker.

Signed-off-by: Fabian Ebner <f.ebner at proxmox.com>
---
 PVE/API2/Disks/Directory.pm |  2 ++
 PVE/API2/Disks/LVM.pm       |  2 ++
 PVE/API2/Disks/LVMThin.pm   |  2 ++
 PVE/API2/Disks/ZFS.pm       | 10 +++++++---
 4 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/PVE/API2/Disks/Directory.pm b/PVE/API2/Disks/Directory.pm
index 2decb89..0068db6 100644
--- a/PVE/API2/Disks/Directory.pm
+++ b/PVE/API2/Disks/Directory.pm
@@ -212,6 +212,8 @@ __PACKAGE__->register_method ({
 	    my $mountunitpath = "/etc/systemd/system/$mountunitname";
 
 	    PVE::Diskmanage::locked_disk_action(sub {
+		PVE::Diskmanage::assert_disk_unused($dev);
+
 		# create partition
 		my $cmd = [$SGDISK, '-n1', '-t1:8300', $dev];
 		print "# ", join(' ', @$cmd), "\n";
diff --git a/PVE/API2/Disks/LVM.pm b/PVE/API2/Disks/LVM.pm
index 569e9d1..2c216c0 100644
--- a/PVE/API2/Disks/LVM.pm
+++ b/PVE/API2/Disks/LVM.pm
@@ -154,6 +154,8 @@ __PACKAGE__->register_method ({
 
 	my $worker = sub {
 	    PVE::Diskmanage::locked_disk_action(sub {
+		PVE::Diskmanage::assert_disk_unused($dev);
+
 		PVE::Storage::LVMPlugin::lvm_create_volume_group($dev, $name);
 
 		if ($param->{add_storage}) {
diff --git a/PVE/API2/Disks/LVMThin.pm b/PVE/API2/Disks/LVMThin.pm
index 4d303f8..81d91a6 100644
--- a/PVE/API2/Disks/LVMThin.pm
+++ b/PVE/API2/Disks/LVMThin.pm
@@ -108,6 +108,8 @@ __PACKAGE__->register_method ({
 
 	my $worker = sub {
 	    PVE::Diskmanage::locked_disk_action(sub {
+		PVE::Diskmanage::assert_disk_unused($dev);
+
 		PVE::Storage::LVMPlugin::lvm_create_volume_group($dev, $name);
 		my $pv = PVE::Storage::LVMPlugin::lvm_pv_info($dev);
 		# keep some free space just in case
diff --git a/PVE/API2/Disks/ZFS.pm b/PVE/API2/Disks/ZFS.pm
index 60077c4..885b93c 100644
--- a/PVE/API2/Disks/ZFS.pm
+++ b/PVE/API2/Disks/ZFS.pm
@@ -345,9 +345,6 @@ __PACKAGE__->register_method ({
 	foreach my $dev (@$devs) {
 	    $dev = PVE::Diskmanage::verify_blockdev_path($dev);
 	    PVE::Diskmanage::assert_disk_unused($dev);
-	    my $sysfsdev = $dev =~ s!^/dev/!/sys/block/!r;
-	    my $udevinfo = PVE::Diskmanage::get_udev_info($sysfsdev);
-	    $dev = $udevinfo->{by_id_link} if defined($udevinfo->{by_id_link});
 	}
 
 	PVE::Storage::assert_sid_unused($name) if $param->{add_storage};
@@ -374,6 +371,13 @@ __PACKAGE__->register_method ({
 
 	my $worker = sub {
 	    PVE::Diskmanage::locked_disk_action(sub {
+		for my $dev (@$devs) {
+		    PVE::Diskmanage::assert_disk_unused($dev);
+		    my $sysfsdev = $dev =~ s!^/dev/!/sys/block/!r;
+		    my $udevinfo = PVE::Diskmanage::get_udev_info($sysfsdev);
+		    $dev = $udevinfo->{by_id_link} if defined($udevinfo->{by_id_link});
+		}
+
 		# create zpool with desired raidlevel
 
 		my $cmd = [$ZPOOL, 'create', '-o', "ashift=$ashift", $name];
-- 
2.30.2