--- Begin Message ---
we format lvm logical volume with qcow2 to handle snapshot chain.
like for qcow2 file, when a snapshot is taken, the current lvm volume
is renamed to snap volname, and a new current lvm volume is created
with the snap volname as backing file
Signed-off-by: Alexandre Derumier <alexandre.derum...@groupe-cyllene.com>
---
src/PVE/Storage/LVMPlugin.pm | 450 ++++++++++++++++++++++++++++++-----
1 file changed, 385 insertions(+), 65 deletions(-)
diff --git a/src/PVE/Storage/LVMPlugin.pm b/src/PVE/Storage/LVMPlugin.pm
index 25268a4..af50b91 100644
--- a/src/PVE/Storage/LVMPlugin.pm
+++ b/src/PVE/Storage/LVMPlugin.pm
@@ -11,6 +11,8 @@ use PVE::JSONSchema qw(get_standard_option);
use PVE::Storage::Common;
+use JSON;
+
use base qw(PVE::Storage::Plugin);
# lvm helper functions
@@ -209,6 +211,59 @@ sub lvm_list_volumes {
return $lvs;
}
+sub free_lvm_volumes {
+ my ($class, $scfg, $storeid, $volnames) = @_;
+
+ my $vg = $scfg->{vgname};
+
+ # we need to zero out LVM data for security reasons
+ # and to allow thin provisioning
+ my $zero_out_worker = sub {
+ # wipe throughput up to 10MB/s by default; may be overwritten with
saferemove_throughput
+ my $throughput = '-10485760';
+ if ($scfg->{saferemove_throughput}) {
+ $throughput = $scfg->{saferemove_throughput};
+ }
+ for my $name (@$volnames) {
+ print "zero-out data on image $name (/dev/$vg/del-$name)\n";
+
+ my $cmd = [
+ '/usr/bin/cstream',
+ '-i', '/dev/zero',
+ '-o', "/dev/$vg/del-$name",
+ '-T', '10',
+ '-v', '1',
+ '-b', '1048576',
+ '-t', "$throughput"
+ ];
+ eval { run_command($cmd, errmsg => "zero out finished (note: 'No
space left on device' is ok here)"); };
+ warn $@ if $@;
+
+ $class->cluster_lock_storage($storeid, $scfg->{shared}, undef, sub {
+ my $cmd = ['/sbin/lvremove', '-f', "$vg/del-$name"];
+ run_command($cmd, errmsg => "lvremove '$vg/del-$name' error");
+ });
+ print "successfully removed volume $name ($vg/del-$name)\n";
+ }
+ };
+
+ if ($scfg->{saferemove}) {
+ for my $name (@$volnames) {
+ # avoid long running task, so we only rename here
+ my $cmd = ['/sbin/lvrename', $vg, $name, "del-$name"];
+ run_command($cmd, errmsg => "lvrename '$vg/$name' error");
+ }
+ return $zero_out_worker;
+ } else {
+ for my $name (@$volnames) {
+ my $tmpvg = $scfg->{vgname};
+ my $cmd = ['/sbin/lvremove', '-f', "$tmpvg/$name"];
+ run_command($cmd, errmsg => "lvremove '$tmpvg/$name' error");
+ }
+ }
+}
+
+
# Configuration
sub type {
@@ -218,6 +273,7 @@ sub type {
sub plugindata {
return {
content => [ {images => 1, rootdir => 1}, { images => 1 }],
+ format => [ { raw => 1, qcow2 => 1 } , 'raw' ],
'sensitive-properties' => {},
};
}
@@ -294,7 +350,10 @@ sub parse_volname {
PVE::Storage::Plugin::parse_lvm_name($volname);
if ($volname =~ m/^(vm-(\d+)-\S+)$/) {
- return ('images', $1, $2, undef, undef, undef, 'raw');
+ my $name = $1;
+ my $vmid = $2;
+ my $format = $volname =~ m/\.qcow2$/ ? 'qcow2' : 'raw';
+ return ('images', $name, $vmid, undef, undef, undef, $format);
}
die "unable to parse lvm volume name '$volname'\n";
@@ -303,11 +362,13 @@ sub parse_volname {
sub filesystem_path {
my ($class, $scfg, $volname, $snapname) = @_;
- die "lvm snapshot is not implemented"if defined($snapname);
+ my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $format) =
+ $class->parse_volname($volname);
- my ($vtype, $name, $vmid) = $class->parse_volname($volname);
+ die "snapshot is working with qcow2 format only" if defined($snapname) &&
$format ne 'qcow2';
my $vg = $scfg->{vgname};
+ $name = $class->get_snap_name($volname, $snapname) if $snapname;
my $path = "/dev/$vg/$name";
@@ -335,7 +396,9 @@ sub find_free_diskname {
my $disk_list = [ keys %{$lvs->{$vg}} ];
- return PVE::Storage::Plugin::get_next_vm_diskname($disk_list, $storeid,
$vmid, undef, $scfg);
+ $add_fmt_suffix = $fmt eq 'qcow2' ? 1 : undef;
+
+ return PVE::Storage::Plugin::get_next_vm_diskname($disk_list, $storeid,
$vmid, $fmt, $scfg, $add_fmt_suffix);
}
sub lvcreate {
@@ -363,13 +426,47 @@ sub lvrename {
);
}
-sub alloc_image {
- my ($class, $storeid, $scfg, $vmid, $fmt, $name, $size) = @_;
+my sub lvm_qcow2_format {
+ my ($class, $storeid, $scfg, $name, $fmt, $backing_snap, $size) = @_;
- die "unsupported format '$fmt'" if $fmt ne 'raw';
+ die "Can't format the volume, the format is not qcow2" if $fmt ne 'qcow2';
+
+ $class->activate_volume($storeid, $scfg, $name);
+ my $path = $class->path($scfg, $name, $storeid);
+
+ if ($backing_snap) {
+ my $backing_path = $class->path($scfg, $name, $storeid, $backing_snap);
+ PVE::Storage::Common::qemu_img_create_qcow2_backed($scfg, $path,
$backing_path, $fmt);
+ } else {
+ PVE::Storage::Common::qemu_img_create($scfg, $fmt, $size, $path);
+ }
+}
+
+my sub calculate_lvm_size {
+ my ($size, $fmt, $backing_snap) = @_;
+ #input size = qcow2 image size in kb
+
+ return $size if $fmt ne 'qcow2';
+
+ my $json = PVE::Storage::Common::qemu_img_measure($size, $fmt, 5,
$backing_snap);
+ die "failed to query file information with qemu-img measure\n" if !$json;
+ my $info = eval { decode_json($json) };
+ if ($@) {
+ die "Invalid JSON: $@\n";
+ }
+
+ die "Missing fully-allocated value from json" if
!$info->{'fully-allocated'};
+
+ return $info->{'fully-allocated'} / 1024;
+}
+
+my sub alloc_lvm_image {
+ my ($class, $storeid, $scfg, $vmid, $fmt, $name, $size, $backing_snap) =
@_;
+
+ die "unsupported format '$fmt'" if $fmt !~ m/(raw|qcow2)/;
die "illegal name '$name' - should be 'vm-$vmid-*'\n"
- if $name && $name !~ m/^vm-$vmid-/;
+ if $name !~ m/^vm-$vmid-/;
my $vgs = lvm_vgs();
@@ -378,70 +475,94 @@ sub alloc_image {
die "no such volume group '$vg'\n" if !defined ($vgs->{$vg});
my $free = int($vgs->{$vg}->{free});
+ my $lvmsize = calculate_lvm_size($size, $fmt, $backing_snap);
die "not enough free space ($free < $size)\n" if $free < $size;
- $name = $class->find_free_diskname($storeid, $scfg, $vmid)
+ my $tags = ["pve-vm-$vmid"];
+ #tags all snapshots volumes with the main volume tag for easier activation
of the whole group
+ push @$tags, "\@pve-$name" if $fmt eq 'qcow2';
+ lvcreate($vg, $name, $lvmsize, $tags);
+
+ return if $fmt ne 'qcow2';
+
+ #format the lvm volume with qcow2 format
+ eval { lvm_qcow2_format($class, $storeid, $scfg, $name, $fmt,
$backing_snap, $size) };
+ if ($@) {
+ my $err = $@;
+ #no need to safe cleanup as the volume is still empty
+ eval {
+ my $cmd = ['/sbin/lvremove', '-f', "$vg/$name"];
+ run_command($cmd, errmsg => "lvremove '$vg/$name' error");
+ };
+ die $err;
+ }
+}
+
+sub alloc_image {
+ my ($class, $storeid, $scfg, $vmid, $fmt, $name, $size) = @_;
+
+ $name = $class->find_free_diskname($storeid, $scfg, $vmid, $fmt)
if !$name;
- lvcreate($vg, $name, $size, ["pve-vm-$vmid"]);
+ alloc_lvm_image($class, $storeid, $scfg, $vmid, $fmt, $name, $size);
return $name;
}
-sub free_image {
- my ($class, $storeid, $scfg, $volname, $isBase) = @_;
+sub alloc_snap_image {
+ my ($class, $storeid, $scfg, $volname, $backing_snap) = @_;
- my $vg = $scfg->{vgname};
+ my ($vmid, $format) = ($class->parse_volname($volname))[2,6];
+ my $path = $class->path($scfg, $volname, $storeid, $backing_snap);
- # we need to zero out LVM data for security reasons
- # and to allow thin provisioning
+ #we need to use same size than the backing image qcow2 virtual-size
+ my $size = PVE::Storage::Plugin::file_size_info($path, 5, $format);
+ $size = $size / 1024; #we use kb in lvcreate
- my $zero_out_worker = sub {
- print "zero-out data on image $volname (/dev/$vg/del-$volname)\n";
+ alloc_lvm_image($class, $storeid, $scfg, $vmid, $format, $volname, $size,
$backing_snap);
+}
- # wipe throughput up to 10MB/s by default; may be overwritten with
saferemove_throughput
- my $throughput = '-10485760';
- if ($scfg->{saferemove_throughput}) {
- $throughput = $scfg->{saferemove_throughput};
- }
+sub free_snap_image {
+ my ($class, $storeid, $scfg, $volname, $snap) = @_;
- my $cmd = [
- '/usr/bin/cstream',
- '-i', '/dev/zero',
- '-o', "/dev/$vg/del-$volname",
- '-T', '10',
- '-v', '1',
- '-b', '1048576',
- '-t', "$throughput"
- ];
- eval { run_command($cmd, errmsg => "zero out finished (note: 'No space
left on device' is ok here)"); };
- warn $@ if $@;
+ #activate only the snapshot volume
+ my $path = $class->path($scfg, $volname, $storeid, $snap);
+ my $cmd = ['/sbin/lvchange', '-aly', $path];
+ run_command($cmd, errmsg => "can't activate LV '$path' to zero-out its
data");
+ $cmd = ['/sbin/lvchange', '--refresh', $path];
+ run_command($cmd, errmsg => "can't refresh LV '$path' to zero-out its
data");
- $class->cluster_lock_storage($storeid, $scfg->{shared}, undef, sub {
- my $cmd = ['/sbin/lvremove', '-f', "$vg/del-$volname"];
- run_command($cmd, errmsg => "lvremove '$vg/del-$volname' error");
- });
- print "successfully removed volume $volname ($vg/del-$volname)\n";
- };
+ my $snap_volname = $class->get_snap_volname($volname, $snap);
+ return $class->free_lvm_volumes($scfg, $storeid, [$snap_volname]);
+}
- my $cmd = ['/sbin/lvchange', '-aly', "$vg/$volname"];
- run_command($cmd, errmsg => "can't activate LV '$vg/$volname' to zero-out
its data");
- $cmd = ['/sbin/lvchange', '--refresh', "$vg/$volname"];
- run_command($cmd, errmsg => "can't refresh LV '$vg/$volname' to zero-out
its data");
+sub free_image {
+ my ($class, $storeid, $scfg, $volname, $isBase, $format) = @_;
- if ($scfg->{saferemove}) {
- # avoid long running task, so we only rename here
- $cmd = ['/sbin/lvrename', $vg, $volname, "del-$volname"];
- run_command($cmd, errmsg => "lvrename '$vg/$volname' error");
- return $zero_out_worker;
- } else {
- my $tmpvg = $scfg->{vgname};
- $cmd = ['/sbin/lvremove', '-f', "$tmpvg/$volname"];
- run_command($cmd, errmsg => "lvremove '$tmpvg/$volname' error");
+ my $name = ($class->parse_volname($volname))[1];
+
+ #activate volumes && snapshot volumes
+ my $path = $class->path($scfg, $volname, $storeid);
+ $path = "\@pve-$name" if $format && $format eq 'qcow2';
+ my $cmd = ['/sbin/lvchange', '-aly', $path];
+ run_command($cmd, errmsg => "can't activate LV '$path' to zero-out its
data");
+ $cmd = ['/sbin/lvchange', '--refresh', $path];
+ run_command($cmd, errmsg => "can't refresh LV '$path' to zero-out its
data");
+
+ my $volnames = [];
+ my $snapshots = $class->volume_snapshot_info($scfg, $storeid, $volname);
+ for my $snapid (sort { $snapshots->{$b}->{order} <=>
$snapshots->{$a}->{order} } keys %$snapshots) {
+ my $snap = $snapshots->{$snapid};
+ next if $snapid eq 'current';
+ next if !$snap->{volid};
+ next if !$snap->{ext};
+ my ($snap_storeid, $snap_volname) =
PVE::Storage::parse_volume_id($snap->{volid});
+ push @$volnames, $snap_volname;
}
+ push @$volnames, $volname;
- return undef;
+ return $class->free_lvm_volumes($scfg, $storeid, $volnames);
}
my $check_tags = sub {
@@ -539,6 +660,12 @@ sub activate_volume {
my $lvm_activate_mode = 'ey';
+ #activate volume && all snapshots volumes by tag
+ my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $format) =
+ $class->parse_volname($volname);
+
+ $path = "\@pve-$name" if $format eq 'qcow2';
+
my $cmd = ['/sbin/lvchange', "-a$lvm_activate_mode", $path];
run_command($cmd, errmsg => "can't activate LV '$path'");
$cmd = ['/sbin/lvchange', '--refresh', $path];
@@ -551,6 +678,10 @@ sub deactivate_volume {
my $path = $class->path($scfg, $volname, $storeid, $snapname);
return if ! -b $path;
+ my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $format) =
+ $class->parse_volname($volname);
+ $path = "\@pve-$name" if $format eq 'qcow2';
+
my $cmd = ['/sbin/lvchange', '-aln', $path];
run_command($cmd, errmsg => "can't deactivate LV '$path'");
}
@@ -558,21 +689,31 @@ sub deactivate_volume {
sub volume_resize {
my ($class, $scfg, $storeid, $volname, $size, $running) = @_;
- $size = ($size/1024/1024) . "M";
+ my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $format) =
+ $class->parse_volname($volname);
+
+ my $lvmsize = calculate_lvm_size($size/1024, $format);
+ $lvmsize = "${lvmsize}k";
my $path = $class->path($scfg, $volname);
- my $cmd = ['/sbin/lvextend', '-L', $size, $path];
+ my $cmd = ['/sbin/lvextend', '-L', $lvmsize, $path];
$class->cluster_lock_storage($storeid, $scfg->{shared}, undef, sub {
run_command($cmd, errmsg => "error resizing volume '$path'");
});
+ if(!$running && $format eq 'qcow2') {
+ my $prealloc_opt =
PVE::Storage::Plugin::preallocation_cmd_option($scfg, $format);
+ my $cmd = ['/usr/bin/qemu-img', 'resize', "--$prealloc_opt", '-f',
$format, $path , $size];
+ run_command($cmd, timeout => 10);
+ }
+
return 1;
}
sub volume_size_info {
- my ($class, $scfg, $storeid, $volname, $timeout) = @_;
- my $path = $class->filesystem_path($scfg, $volname);
+ my ($class, $scfg, $storeid, $volname, $timeout, $snap) = @_;
+ my $path = $class->filesystem_path($scfg, $volname, $snap);
my $cmd = ['/sbin/lvs', '--separator', ':', '--noheadings', '--units', 'b',
'--unbuffered', '--nosuffix', '--options', 'lv_size', $path];
@@ -588,30 +729,181 @@ sub volume_size_info {
sub volume_snapshot {
my ($class, $scfg, $storeid, $volname, $snap, $running) = @_;
- die "lvm snapshot is not implemented";
+ my ($vmid, $format) = ($class->parse_volname($volname))[2,6];
+
+ die "can't snapshot this image format\n" if $format ne 'qcow2';
+
+ if ($running) {
+ #rename with blockdev-reopen is done at qemu level when running
+ $class->alloc_snap_image($storeid, $scfg, $volname, $snap);
+ if ($@) {
+ die "can't allocate new volume $volname: $@\n";
+ }
+ return;
+ }
+
+ #rename current volume to snap volume
+ eval { $class->rename_volume($scfg, $storeid, $volname, $vmid, undef,
'current', $snap) };
+ die "error rename $volname to $snap\n" if $@;
+
+ eval { $class->alloc_snap_image($storeid, $scfg, $volname, $snap) };
+ if ($@) {
+ my $err = $@;
+ eval { $class->rename_volume($scfg, $storeid, $volname, $vmid, undef,
$snap, 'current') };
+ die $err;
+ }
+}
+
+sub volume_rollback_is_possible {
+ my ($class, $scfg, $storeid, $volname, $snap, $blockers) = @_;
+
+ my $snap_path = $class->path($scfg, $volname, $storeid, $snap);
+
+ $class->activate_volume($storeid, $scfg, $volname, undef, {});
+ my $snapshots = $class->volume_snapshot_info($scfg, $storeid, $volname);
+ my $parent_snap = $snapshots->{current}->{parent};
+
+ return 1 if $parent_snap eq $snap;
+ die "can't rollback, '$snap' is not most recent snapshot on '$volname'\n";
+
+ return 1;
}
sub volume_snapshot_rollback {
my ($class, $scfg, $storeid, $volname, $snap) = @_;
- die "lvm snapshot rollback is not implemented";
+ my $format = ($class->parse_volname($volname))[6];
+
+ die "can't rollback snapshot for this image format\n" if $format ne
'qcow2';
+
+ $class->activate_volume($storeid, $scfg, $volname, undef, {});
+
+ # we can simply reformat the current lvm volume to avoid
+ # a long safe remove.(not needed here, as the allocated space
+ # is still the same owner)
+ eval { lvm_qcow2_format($class, $storeid, $scfg, $volname, $format, $snap)
};
+ if($@) {
+ die "can't rollback. Error reformating current $volname\n";
+ }
+ return undef;
}
sub volume_snapshot_delete {
- my ($class, $scfg, $storeid, $volname, $snap) = @_;
+ my ($class, $scfg, $storeid, $volname, $snap, $running) = @_;
- die "lvm snapshot delete is not implemented";
+ my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $format) =
$class->parse_volname($volname);
+
+ die "can't delete snapshot for this image format\n" if $format ne 'qcow2';
+
+ if ($running) {
+ my $cleanup_worker = eval { $class->free_snap_image($storeid, $scfg,
$volname, $snap); };
+ die "error deleting snapshot $snap $@\n" if $@;
+
+ if ($cleanup_worker) {
+ my $rpcenv = PVE::RPCEnvironment::get();
+ my $authuser = $rpcenv->get_user();
+ $rpcenv->fork_worker('imgdel', undef, $authuser, $cleanup_worker);
+ }
+ return;
+ }
+
+ my $cmd = "";
+ my $path = $class->filesystem_path($scfg, $volname);
+
+ $class->activate_volume($storeid, $scfg, $volname);
+
+ my $snapshots = $class->volume_snapshot_info($scfg, $storeid, $volname);
+ my $snappath = $snapshots->{$snap}->{file};
+ my $snapvolname = $snapshots->{$snap}->{volname};
+ die "volume $snappath is missing" if !-e $snappath;
+
+ my $parentsnap = $snapshots->{$snap}->{parent};
+
+ my $childsnap = $snapshots->{$snap}->{child};
+ my $childpath = $snapshots->{$childsnap}->{file};
+ my $childvolname = $snapshots->{$childsnap}->{volname};
+
+ my $cleanup_worker = undef;
+ my $err = undef;
+ #if first snapshot,as it should be bigger, we merge child, and rename the
snapshot to child
+ if(!$parentsnap) {
+ print "$volname: deleting snapshot '$snap' by commiting snapshot
'$childsnap'\n";
+ print "running 'qemu-img commit $childpath'\n";
+ #can't use -d here, as it's an lvm volume
+ $cmd = ['/usr/bin/qemu-img', 'commit', $childpath];
+ eval { run_command($cmd) };
+ if ($@) {
+ warn "The state of $snap is now invalid. Don't try to clone or
rollback it. You can only try to delete it again later\n";
+ die "error commiting $childsnap to $snap; $@\n";
+ }
+ print"delete $childvolname\n";
+ $cleanup_worker = eval { $class->free_snap_image($storeid, $scfg,
$volname, $childsnap) };
+ if ($@) {
+ die "error delete old snapshot volume $childvolname: $@\n";
+ }
+
+ print"rename $snapvolname to $childvolname\n";
+ my $vg = $scfg->{vgname};
+ eval { lvrename($vg, $snapvolname, $childvolname) };
+ if ($@) {
+ warn $@;
+ $err = "error renaming snapshot: $@\n";
+ }
+
+ } else {
+ #we rebase the child image on the parent as new backing image
+ my $parentpath = $snapshots->{$parentsnap}->{file};
+ print "$volname: deleting snapshot '$snap' by rebasing '$childsnap' on
top of '$parentsnap'\n";
+ print "running 'qemu-img rebase -b $parentpath -F qcow -f qcow2
$childpath'\n";
+ $cmd = ['/usr/bin/qemu-img', 'rebase', '-b', $parentpath, '-F',
'qcow2', '-f', 'qcow2', $childpath];
+ eval { run_command($cmd) };
+ if ($@) {
+ #in case of abort, the state of the snap is still clean, just a
little bit bigger
+ die "error rebase $childsnap from $parentsnap; $@\n";
+ }
+ #delete the snapshot
+ eval { $cleanup_worker = $class->free_snap_image($storeid, $scfg,
$volname, $snap); };
+ if ($@) {
+ die "error deleting old snapshot volume $snapvolname\n";
+ }
+ }
+
+ if ($cleanup_worker) {
+ my $rpcenv = PVE::RPCEnvironment::get();
+ my $authuser = $rpcenv->get_user();
+ $rpcenv->fork_worker('imgdel', undef, $authuser, $cleanup_worker);
+ }
+
+ die $err if $err;
}
sub volume_has_feature {
my ($class, $scfg, $feature, $storeid, $volname, $snapname, $running) = @_;
my $features = {
- copy => { base => 1, current => 1},
- rename => {current => 1},
+ copy => {
+ base => { qcow2 => 1, raw => 1 },
+ current => { qcow2 => 1, raw => 1},
+ snap => { qcow2 => 1 },
+ },
+ 'rename' => {
+ current => { qcow2 => 1, raw => 1},
+ },
+ snapshot => {
+ current => { qcow2 => 1 },
+ snap => { qcow2 => 1 },
+ },
+# fixme: add later ? (we need to handle basepath, volume activation,...)
+# template => {
+# current => { raw => 1, qcow2 => 1},
+# },
+# clone => {
+# base => { qcow2 => 1 },
+# },
};
- my ($vtype, $name, $vmid, $basename, $basevmid, $isBase) =
+
+ my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $format) =
$class->parse_volname($volname);
my $key = undef;
@@ -620,7 +912,7 @@ sub volume_has_feature {
}else{
$key = $isBase ? 'base' : 'current';
}
- return 1 if $features->{$feature}->{$key};
+ return 1 if defined($features->{$feature}->{$key}->{$format});
return undef;
}
@@ -745,4 +1037,32 @@ sub rename_volume {
return "${storeid}:${target_volname}";
}
+sub qemu_blockdev_options {
+ my ($class, $scfg, $storeid, $volname, $options) = @_;
+
+ my ($path) = $class->filesystem_path($scfg, $volname,
$options->{'snapshot-name'});
+
+ my $format = ($class->parse_volname($volname))[6];
+ die "can attach only the snapshot of a qcow2 image\n"
+ if $options->{'snapshot-name'} && $format ne 'qcow2';
+
+ my $blockdev = { driver => 'host_device', filename => $path };
+
+ return $blockdev;
+}
+
+sub get_snap_name {
+ my ($class, $volname, $snapname) = @_;
+
+ my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $format) =
$class->parse_volname($volname);
+ $name = !$snapname || $snapname eq 'current' ? $name :
"snap-$snapname-$name";
+ return $name;
+}
+
+sub get_snap_volname {
+ my ($class, $volname, $snapname) = @_;
+
+ return $class->get_snap_name($volname, $snapname);
+}
+
1;
--
2.39.5
--- End Message ---
