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Subject: [pve-devel] [PATCH qemu-server 14/14] qcow2: add external snapshot
support
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From: Alexandre Derumier <alexandre.derumier@groupe-cyllene.com>
To: pve-devel@lists.proxmox.com
Subject: [PATCH qemu-server 14/14] qcow2: add external snapshot support
Date: Tue, 22 Apr 2025 13:51:41 +0200
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Signed-off-by: Alexandre Derumier <alexandre.derumier@groupe-cyllene.com>
---
PVE/QemuConfig.pm | 4 +-
PVE/QemuServer.pm | 237 +++++++++++++++++++++++++++++++++++-----
PVE/QemuServer/Drive.pm | 39 ++++---
3 files changed, 239 insertions(+), 41 deletions(-)
diff --git a/PVE/QemuConfig.pm b/PVE/QemuConfig.pm
index 2609542c..785c84a2 100644
--- a/PVE/QemuConfig.pm
+++ b/PVE/QemuConfig.pm
@@ -378,7 +378,7 @@ sub __snapshot_create_vol_snapshot {
print "snapshotting '$device' ($drive->{file})\n";
- PVE::QemuServer::qemu_volume_snapshot($vmid, $device, $storecfg, $volid, $snapname);
+ PVE::QemuServer::qemu_volume_snapshot($vmid, $device, $storecfg, $drive, $snapname);
}
sub __snapshot_delete_remove_drive {
@@ -415,7 +415,7 @@ sub __snapshot_delete_vol_snapshot {
my $storecfg = PVE::Storage::config();
my $volid = $drive->{file};
- PVE::QemuServer::qemu_volume_snapshot_delete($vmid, $storecfg, $volid, $snapname);
+ PVE::QemuServer::qemu_volume_snapshot_delete($vmid, $storecfg, $drive, $snapname);
push @$unused, $volid;
}
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 5cce7094..aff430df 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -55,7 +55,7 @@ use PVE::QemuServer::Helpers qw(config_aware_timeout min_version kvm_user_versio
use PVE::QemuServer::Cloudinit;
use PVE::QemuServer::CGroup;
use PVE::QemuServer::CPUConfig qw(print_cpu_device get_cpu_options get_cpu_bitness is_native_arch get_amd_sev_object get_amd_sev_type);
-use PVE::QemuServer::Drive qw(is_valid_drivename checked_volume_format drive_is_cloudinit drive_is_cdrom drive_is_read_only parse_drive print_drive print_drive_throttle_group generate_drive_blockdev generate_throttle_group);
+use PVE::QemuServer::Drive qw(is_valid_drivename checked_volume_format drive_is_cloudinit drive_is_cdrom drive_is_read_only parse_drive print_drive print_drive_throttle_group generate_drive_blockdev generate_throttle_group generate_blockdev_throttle generate_file_blockdev generate_format_blockdev);
use PVE::QemuServer::Machine;
use PVE::QemuServer::Memory qw(get_current_memory);
use PVE::QemuServer::MetaInfo;
@@ -4518,20 +4518,193 @@ sub qemu_block_resize {
}
sub qemu_volume_snapshot {
- my ($vmid, $deviceid, $storecfg, $volid, $snap) = @_;
+ my ($vmid, $deviceid, $storecfg, $drive, $snap) = @_;
+ my $volid = $drive->{file};
my $running = check_running($vmid);
- if ($running && do_snapshots_with_qemu($storecfg, $volid, $deviceid)) {
- mon_cmd($vmid, 'blockdev-snapshot-internal-sync', device => $deviceid, name => $snap);
+ my $do_snapshots_with_qemu = do_snapshots_with_qemu($storecfg, $volid, $deviceid);
+
+ if ($running && $do_snapshots_with_qemu) {
+ if ($do_snapshots_with_qemu == 2) {
+ print "internal qemu snapshot\n";
+ mon_cmd($vmid, 'blockdev-snapshot-internal-sync', device => $deviceid, name => $snap);
+ } elsif ($do_snapshots_with_qemu == 3) {
+ my $storeid = (PVE::Storage::parse_volume_id($volid))[0];
+ my $scfg = PVE::Storage::storage_config($storecfg, $storeid);
+ print "external qemu snapshot\n";
+ my $snapshots = PVE::Storage::volume_snapshot_info($storecfg, $volid);
+ my $parent_snap = $snapshots->{'current'}->{parent};
+ blockdev_rename($storecfg, $vmid, $deviceid, $drive, 'current', $snap, $parent_snap);
+ eval { blockdev_external_snapshot($storecfg, $vmid, $deviceid, $drive, $snap) };
+ if ($@) {
+ print "error creating snapshot. Revert rename\n";
+ eval { blockdev_rename($storecfg, $vmid, $deviceid, $drive, $snap, 'current', $parent_snap) };
+ }
+ }
} else {
PVE::Storage::volume_snapshot($storecfg, $volid, $snap);
}
}
+sub blockdev_external_snapshot {
+ my ($storecfg, $vmid, $deviceid, $drive, $snap, $size) = @_;
+
+ my $volid = $drive->{file};
+
+ #preallocate add a new current file with reference to backing-file
+ PVE::Storage::volume_snapshot($storecfg, $volid, $snap, 1);
+
+ #be sure to add drive in write mode
+ delete($drive->{ro});
+
+ my $new_file_blockdev = generate_file_blockdev($storecfg, $drive);
+ my $new_fmt_blockdev = generate_format_blockdev($storecfg, $drive, $new_file_blockdev);
+
+ my $snap_file_blockdev = generate_file_blockdev($storecfg, $drive, $snap);
+ my $snap_fmt_blockdev = generate_format_blockdev($storecfg, $drive, $snap_file_blockdev, $snap);
+
+ #backing need to be forced to undef in blockdev, to avoid reopen of backing-file on blockdev-add
+ $new_fmt_blockdev->{backing} = undef;
+
+ PVE::QemuServer::Monitor::mon_cmd($vmid, 'blockdev-add', %$new_fmt_blockdev);
+
+ mon_cmd($vmid, 'blockdev-snapshot', node => $snap_fmt_blockdev->{'node-name'}, overlay => $new_fmt_blockdev->{'node-name'});
+}
+
+sub blockdev_delete {
+ my ($storecfg, $vmid, $drive, $file_blockdev, $fmt_blockdev, $snap) = @_;
+
+ #add eval as reopen is auto removing the old nodename automatically only if it was created at vm start in command line argument
+ eval { mon_cmd($vmid, 'blockdev-del', 'node-name' => $file_blockdev->{'node-name'}) };
+ eval { mon_cmd($vmid, 'blockdev-del', 'node-name' => $fmt_blockdev->{'node-name'}) };
+
+ #delete the file (don't use vdisk_free as we don't want to delete all snapshot chain)
+ print"delete old $file_blockdev->{filename}\n";
+
+ my $storage_name = PVE::Storage::parse_volume_id($drive->{file});
+
+ my $volid = $drive->{file};
+ PVE::Storage::volume_snapshot_delete($storecfg, $volid, $snap, 1);
+}
+
+sub blockdev_rename {
+ my ($storecfg, $vmid, $deviceid, $drive, $src_snap, $target_snap, $parent_snap) = @_;
+
+ print "rename $src_snap to $target_snap\n";
+
+ my $volid = $drive->{file};
+
+ my $src_file_blockdev = generate_file_blockdev($storecfg, $drive, $src_snap);
+ my $src_fmt_blockdev = generate_format_blockdev($storecfg, $drive, $src_file_blockdev, $src_snap);
+ my $target_file_blockdev = generate_file_blockdev($storecfg, $drive, $target_snap);
+ my $target_fmt_blockdev = generate_format_blockdev($storecfg, $drive, $target_file_blockdev, $target_snap);
+
+ #rename volume image
+ PVE::Storage::rename_volume($storecfg, $volid, $vmid, undef, $src_snap, $target_snap);
+
+ if($target_snap eq 'current' || $src_snap eq 'current') {
+ #rename from|to current
+
+ #add backing to target
+ if ($parent_snap) {
+ my $parent_fmt_nodename = encode_nodename('fmt', $volid, $parent_snap);
+ $target_fmt_blockdev->{backing} = $parent_fmt_nodename;
+ }
+ PVE::QemuServer::Monitor::mon_cmd($vmid, 'blockdev-add', %$target_fmt_blockdev);
+
+ #reopen the current throttlefilter nodename with the target fmt nodename
+ my $throttle_blockdev = generate_blockdev_throttle($drive, $target_fmt_blockdev->{'node-name'});
+ PVE::QemuServer::Monitor::mon_cmd($vmid, 'blockdev-reopen', options => [$throttle_blockdev]);
+ } else {
+ rename($src_file_blockdev->{filename}, $target_file_blockdev->{filename});
+
+ #intermediate snapshot
+ PVE::QemuServer::Monitor::mon_cmd($vmid, 'blockdev-add', %$target_fmt_blockdev);
+
+ #reopen the parent node with the new target fmt backing node
+ my $parent_file_blockdev = generate_file_blockdev($storecfg, $drive, $parent_snap);
+ my $parent_fmt_blockdev = generate_format_blockdev($storecfg, $drive, $parent_file_blockdev, $parent_snap);
+ $parent_fmt_blockdev->{backing} = $target_fmt_blockdev->{'node-name'};
+ PVE::QemuServer::Monitor::mon_cmd($vmid, 'blockdev-reopen', options => [$parent_fmt_blockdev]);
+
+ #change backing-file in qcow2 metadatas
+ PVE::QemuServer::Monitor::mon_cmd($vmid, 'change-backing-file', device => $deviceid, 'image-node-name' => $parent_fmt_blockdev->{'node-name'}, 'backing-file' => $target_file_blockdev->{filename});
+ }
+
+ # delete old file|fmt nodes
+ # add eval as reopen is auto removing the old nodename automatically only if it was created at vm start in command line argument
+ eval { PVE::QemuServer::Monitor::mon_cmd($vmid, 'blockdev-del', 'node-name' => $src_file_blockdev->{'node-name'})};
+ eval { PVE::QemuServer::Monitor::mon_cmd($vmid, 'blockdev-del', 'node-name' => $src_fmt_blockdev->{'node-name'})};
+}
+
+sub blockdev_commit {
+ my ($storecfg, $vmid, $deviceid, $drive, $src_snap, $target_snap) = @_;
+
+ my $volid = $drive->{file};
+
+ print "block-commit $src_snap to base:$target_snap\n";
+
+ my $target_file_blockdev = generate_file_blockdev($storecfg, $drive, $target_snap);
+ my $target_fmt_blockdev = generate_format_blockdev($storecfg, $drive, $target_file_blockdev, $target_snap);
+
+ my $src_file_blockdev = generate_file_blockdev($storecfg, $drive, $src_snap);
+ my $src_fmt_blockdev = generate_format_blockdev($storecfg, $drive, $src_file_blockdev, $src_snap);
+
+ my $job_id = "commit-$deviceid";
+ my $jobs = {};
+ my $opts = { 'job-id' => $job_id, device => $deviceid };
+
+ my $complete = undef;
+ if ($src_snap && $src_snap ne 'current') {
+ $complete = 'auto';
+ $opts->{'top-node'} = $src_fmt_blockdev->{'node-name'};
+ $opts->{'base-node'} = $target_fmt_blockdev->{'node-name'};
+ } else {
+ $complete = 'complete';
+ $opts->{'base-node'} = $target_fmt_blockdev->{'node-name'};
+ $opts->{replaces} = $src_fmt_blockdev->{'node-name'};
+ }
+
+ mon_cmd($vmid, "block-commit", %$opts);
+ $jobs->{$job_id} = {};
+ qemu_drive_mirror_monitor($vmid, undef, $jobs, $complete, 0, 'commit');
+
+ blockdev_delete($storecfg, $vmid, $drive, $src_file_blockdev, $src_fmt_blockdev, $src_snap);
+}
+
+sub blockdev_stream {
+ my ($storecfg, $vmid, $deviceid, $drive, $snap, $parent_snap, $target_snap) = @_;
+
+ my $volid = $drive->{file};
+ $target_snap = undef if $target_snap eq 'current';
+
+ my $parent_file_blockdev = generate_file_blockdev($storecfg, $drive, $parent_snap);
+ my $parent_fmt_blockdev = generate_format_blockdev($storecfg, $drive, $parent_file_blockdev, $parent_snap);
+
+ my $target_file_blockdev = generate_file_blockdev($storecfg, $drive, $target_snap);
+ my $target_fmt_blockdev = generate_format_blockdev($storecfg, $drive, $target_file_blockdev, $target_snap);
+
+ my $snap_file_blockdev = generate_file_blockdev($storecfg, $drive, $snap);
+ my $snap_fmt_blockdev = generate_format_blockdev($storecfg, $drive, $snap_file_blockdev, $snap);
+
+ my $job_id = "stream-$deviceid";
+ my $jobs = {};
+ my $options = { 'job-id' => $job_id, device => $target_fmt_blockdev->{'node-name'} };
+ $options->{'base-node'} = $parent_fmt_blockdev->{'node-name'};
+ $options->{'backing-file'} = $parent_file_blockdev->{filename};
+
+ mon_cmd($vmid, 'block-stream', %$options);
+ $jobs->{$job_id} = {};
+ qemu_drive_mirror_monitor($vmid, undef, $jobs, 'auto', 0, 'stream');
+
+ blockdev_delete($storecfg, $vmid, $drive, $snap_file_blockdev, $snap_fmt_blockdev, $snap);
+}
+
sub qemu_volume_snapshot_delete {
- my ($vmid, $storecfg, $volid, $snap) = @_;
+ my ($vmid, $storecfg, $drive, $snap) = @_;
+ my $volid = $drive->{file};
my $running = check_running($vmid);
my $attached_deviceid;
@@ -4543,13 +4716,36 @@ sub qemu_volume_snapshot_delete {
});
}
+ my $do_snapshots_with_qemu = do_snapshots_with_qemu($storecfg, $volid, $attached_deviceid);
+
if ($attached_deviceid && do_snapshots_with_qemu($storecfg, $volid, $attached_deviceid)) {
- mon_cmd(
- $vmid,
- 'blockdev-snapshot-delete-internal-sync',
- device => $attached_deviceid,
- name => $snap,
- );
+ if ($do_snapshots_with_qemu == 2) {
+ mon_cmd(
+ $vmid,
+ 'blockdev-snapshot-delete-internal-sync',
+ device => $attached_deviceid,
+ name => $snap,
+ );
+ } elsif ($do_snapshots_with_qemu == 3) {
+ print "delete qemu external snapshot\n";
+
+ my $path = PVE::Storage::path($storecfg, $volid);
+ my $snapshots = PVE::Storage::volume_snapshot_info($storecfg, $volid);
+ my $parentsnap = $snapshots->{$snap}->{parent};
+ my $childsnap = $snapshots->{$snap}->{child};
+
+ # if we delete the first snasphot, we commit because the first snapshot original base image, it should be big.
+ # improve-me: if firstsnap > child : commit, if firstsnap < child do a stream.
+ if(!$parentsnap) {
+ print"delete first snapshot $snap\n";
+ blockdev_commit($storecfg, $vmid, $attached_deviceid, $drive, $childsnap, $snap);
+ blockdev_rename($storecfg, $vmid, $attached_deviceid, $drive, $snap, $childsnap, $snapshots->{$childsnap}->{child});
+ } else {
+ #intermediate snapshot, we always stream the snapshot to child snapshot
+ print"stream intermediate snapshot $snap to $childsnap\n";
+ blockdev_stream($storecfg, $vmid, $attached_deviceid, $drive, $snap, $parentsnap, $childsnap);
+ }
+ }
} else {
PVE::Storage::volume_snapshot_delete(
$storecfg, $volid, $snap, $attached_deviceid ? 1 : undef);
@@ -7778,27 +7974,16 @@ sub foreach_storage_used_by_vm {
}
}
-my $qemu_snap_storage = {
- rbd => 1,
-};
sub do_snapshots_with_qemu {
my ($storecfg, $volid, $deviceid) = @_;
- return if $deviceid =~ m/tpmstate0/;
+ return if $deviceid && $deviceid =~ m/tpmstate0/;
- my $storage_name = PVE::Storage::parse_volume_id($volid);
- my $scfg = $storecfg->{ids}->{$storage_name};
- die "could not find storage '$storage_name'\n" if !defined($scfg);
+ my $snapshot_type = PVE::Storage::volume_has_feature($storecfg, 'snapshot', $volid);
- if ($qemu_snap_storage->{$scfg->{type}} && !$scfg->{krbd}){
- return 1;
- }
+ return $snapshot_type if $snapshot_type == 2 || $snapshot_type == 3;
- if ($volid =~ m/\.(qcow2|qed)$/){
- return 1;
- }
-
- return;
+ return undef;
}
sub qga_check_running {
diff --git a/PVE/QemuServer/Drive.pm b/PVE/QemuServer/Drive.pm
index 0737034d..93903a59 100644
--- a/PVE/QemuServer/Drive.pm
+++ b/PVE/QemuServer/Drive.pm
@@ -27,6 +27,9 @@ print_drive
print_drive_throttle_group
generate_drive_blockdev
generate_throttle_group
+generate_blockdev_throttle
+generate_format_blockdev
+generate_file_blockdev
);
our $QEMU_FORMAT_RE = qr/raw|qcow|qcow2|qed|vmdk|cloop/;
@@ -1074,6 +1077,8 @@ sub print_drive_throttle_group {
sub generate_file_blockdev {
my ($storecfg, $drive, $snap, $nodename) = @_;
+ $snap = undef if $snap && $snap eq 'current';
+
my $volid = $drive->{file};
my $driveid = get_drive_id($drive);
@@ -1209,6 +1214,8 @@ sub generate_file_blockdev {
sub generate_format_blockdev {
my ($storecfg, $drive, $file, $snap, $nodename) = @_;
+ $snap = undef if $snap && $snap eq 'current';
+
my $volid = $drive->{file};
#nbd don't support format blockdev, return the fileblockdev
return $file if $volid =~ /^nbd:/;
@@ -1280,6 +1287,15 @@ sub generate_backing_chain_blockdev {
return $chain_blockdev;
}
+sub generate_blockdev_throttle {
+ my ($drive, $blockdev_file) = @_;
+
+ my $drive_id = get_drive_id($drive);
+ #this is the topfilter entry point, use $drive-drive_id as nodename
+ my $blockdev_throttle = { driver => "throttle", 'node-name' => "drive-$drive_id", 'throttle-group' => "throttle-drive-$drive_id", 'file' => $blockdev_file };
+ return $blockdev_throttle;
+}
+
sub generate_drive_blockdev {
my ($storecfg, $drive, $live_restore_name) = @_;
@@ -1303,22 +1319,19 @@ sub generate_drive_blockdev {
#pflash0 don't support throttle-filter
return $blockdev_format if $drive_id eq 'pflash0';
- my $blockdev_live_restore = undef;
- if ($live_restore_name) {
- die "$drive_id: Proxmox Backup Server backed drive cannot auto-detect the format\n"
- if !$drive->{format};
+ return generate_blockdev_throttle($drive, $blockdev_format) if !$live_restore_name;
- $blockdev_live_restore = { 'node-name' => "liverestore-drive-$drive_id",
- backing => $live_restore_name,
- 'auto-remove' => 'on', format => "alloc-track",
- file => $blockdev_format };
- }
+ die "$drive_id: Proxmox Backup Server backed drive cannot auto-detect the format\n"
+ if !$drive->{format};
- #this is the topfilter entry point, use $drive-drive_id as nodename
- my $blockdev_throttle = { driver => "throttle", 'node-name' => "drive-$drive_id", 'throttle-group' => "throttle-drive-$drive_id" };
#put liverestore filter between throttle && format filter
- $blockdev_throttle->{file} = $live_restore_name ? $blockdev_live_restore : $blockdev_format;
- return $blockdev_throttle,
+ my $blockdev_live_restore = { 'node-name' => "liverestore-drive-$drive_id",
+ backing => $live_restore_name,
+ 'auto-remove' => 'on', format => "alloc-track",
+ file => $blockdev_format };
+
+ return generate_blockdev_throttle($drive, $blockdev_live_restore);
+
}
sub encode_base62 {
--
2.39.5
--===============6758769360142399758==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
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--===============6758769360142399758==--