X-Git-Url: https://git.proxmox.com/?p=pve-storage.git;a=blobdiff_plain;f=PVE%2FStorage%2FBTRFSPlugin.pm;h=63d307df6e8f4b5fa6cbb9239cb8481a4e9cc735;hp=5360dca7184e3e7070c2a5568bc604bdb5778e30;hb=HEAD;hpb=f449cddc799699bfa0b37f9cdf2b40f5392fb280

diff --git a/PVE/Storage/BTRFSPlugin.pm b/PVE/Storage/BTRFSPlugin.pm
deleted file mode 100644
index 5360dca..0000000
--- a/PVE/Storage/BTRFSPlugin.pm
+++ /dev/null
@@ -1,911 +0,0 @@
-package PVE::Storage::BTRFSPlugin;
-
-use strict;
-use warnings;
-
-use base qw(PVE::Storage::Plugin);
-
-use Fcntl qw(S_ISDIR O_WRONLY O_CREAT O_EXCL);
-use File::Basename qw(dirname);
-use File::Path qw(mkpath);
-use IO::Dir;
-use POSIX qw(EEXIST);
-
-use PVE::Tools qw(run_command dir_glob_foreach);
-
-use PVE::Storage::DirPlugin;
-
-use constant {
-    BTRFS_FIRST_FREE_OBJECTID => 256,
-    FS_NOCOW_FL => 0x00800000,
-    FS_IOC_GETFLAGS => 0x40086602,
-    FS_IOC_SETFLAGS => 0x80086601,
-    BTRFS_MAGIC => 0x9123683e,
-};
-
-# Configuration (similar to DirPlugin)
-
-sub type {
-    return 'btrfs';
-}
-
-sub plugindata {
-    return {
-	content => [
-	    {
-		images => 1,
-		rootdir => 1,
-		vztmpl => 1,
-		iso => 1,
-		backup => 1,
-		snippets => 1,
-		none => 1,
-	    },
-	    { images => 1, rootdir => 1 },
-	],
-	format => [ { raw => 1, subvol => 1 }, 'raw', ],
-    };
-}
-
-sub properties {
-    return {
-	nocow => {
-	    description => "Set the NOCOW flag on files."
-		. " Disables data checksumming and causes data errors to be unrecoverable from"
-		. " while allowing direct I/O. Only use this if data does not need to be any more"
-		. " safe than on a single ext4 formatted disk with no underlying raid system.",
-	    type => 'boolean',
-	    default => 0,
-	},
-    };
-}
-
-sub options {
-    return {
-	path => { fixed => 1 },
-	nodes => { optional => 1 },
-	shared => { optional => 1 },
-	disable => { optional => 1 },
-	maxfiles => { optional => 1 },
-	content => { optional => 1 },
-	format => { optional => 1 },
-	is_mountpoint => { optional => 1 },
-	nocow => { optional => 1 },
-	# TODO: The new variant of mkdir with  `populate` vs `create`...
-    };
-}
-
-# Storage implementation
-#
-# We use the same volume names are directory plugins, but map *raw* disk image file names into a
-# subdirectory.
-#
-# `vm-VMID-disk-ID.raw`
-#   -> `images/VMID/vm-VMID-disk-ID/disk.raw`
-#   where the `vm-VMID-disk-ID/` subdirectory is a btrfs subvolume
-
-# Reuse `DirPlugin`'s `check_config`. This simply checks for invalid paths.
-sub check_config {
-    my ($self, $sectionId, $config, $create, $skipSchemaCheck) = @_;
-    return PVE::Storage::DirPlugin::check_config($self, $sectionId, $config, $create, $skipSchemaCheck);
-}
-
-my sub getfsmagic($) {
-    my ($path) = @_;
-    # The field type sizes in `struct statfs` are defined in a rather annoying way, and we only
-    # need the first field, which is a `long` for our supported platforms.
-    # Should be moved to pve-rs, so this can be the problem of the `libc` crate ;-)
-    # Just round up and extract what we need:
-    my $buf = pack('x160');
-    if (0 != syscall(&PVE::Syscall::SYS_statfs, $path, $buf)) {
-	die "statfs on '$path' failed - $!\n";
-    }
-
-    return unpack('L!', $buf);
-}
-
-my sub assert_btrfs($) {
-    my ($path) = @_;
-    die "'$path' is not a btrfs file system\n"
-	if getfsmagic($path) != BTRFS_MAGIC;
-}
-
-sub activate_storage {
-    my ($class, $storeid, $scfg, $cache) = @_;
-
-    my $path = $scfg->{path};
-    if (!defined($scfg->{mkdir}) || $scfg->{mkdir}) {
-	mkpath $path;
-    }
-
-    my $mp = PVE::Storage::DirPlugin::parse_is_mountpoint($scfg);
-    if (defined($mp) && !path_is_mounted($mp, $cache->{mountdata})) {
-	die "unable to activate storage '$storeid' - directory is expected to be a mount point but"
-	." is not mounted: '$mp'\n";
-    }
-
-    assert_btrfs($path); # only assert this stuff now, ensures $path is there and better UX
-
-    $class->SUPER::activate_storage($storeid, $scfg, $cache);
-}
-
-sub status {
-    my ($class, $storeid, $scfg, $cache) = @_;
-    return PVE::Storage::DirPlugin::status($class, $storeid, $scfg, $cache);
-}
-
-# TODO: sub get_volume_notes {}
-
-# TODO: sub update_volume_notes {}
-
-# croak would not include the caller from within this module
-sub __error {
-    my ($msg) = @_;
-    my (undef, $f, $n) = caller(1);
-    die "$msg at $f: $n\n";
-}
-
-# Given a name (eg. `vm-VMID-disk-ID.raw`), take the part up to the format suffix as the name of
-# the subdirectory (subvolume).
-sub raw_name_to_dir($) {
-    my ($raw) = @_;
-
-    # For the subvolume directory Strip the `.<format>` suffix:
-    if ($raw =~ /^(.*)\.raw$/) {
-	return $1;
-    }
-
-    __error "internal error: bad disk name: $raw";
-}
-
-sub raw_file_to_subvol($) {
-    my ($file) = @_;
-
-    if ($file =~ m|^(.*)/disk\.raw$|) {
-	return "$1";
-    }
-
-    __error "internal error: bad raw path: $file";
-}
-
-sub filesystem_path {
-    my ($class, $scfg, $volname, $snapname) = @_;
-
-    my ($vtype, $name, $vmid, undef, undef, $isBase, $format) =
-	$class->parse_volname($volname);
-
-    my $path = $class->get_subdir($scfg, $vtype);
-
-    $path .= "/$vmid" if $vtype eq 'images';
-
-    if ($format eq 'raw') {
-	my $dir = raw_name_to_dir($name);
-	if ($snapname) {
-	    $dir .= "\@$snapname";
-	}
-	$path .= "/$dir/disk.raw";
-    } elsif ($format eq 'subvol') {
-	$path .= "/$name";
-	if ($snapname) {
-	    $path .= "\@$snapname";
-	}
-    } else {
-	$path .= "/$name";
-    }
-
-    return wantarray ? ($path, $vmid, $vtype) : $path;
-}
-
-sub btrfs_cmd {
-    my ($class, $cmd, $outfunc) = @_;
-
-    my $msg = '';
-    my $func;
-    if (defined($outfunc)) {
-	$func = sub {
-	    my $part = &$outfunc(@_);
-	    $msg .= $part if defined($part);
-	};
-    } else {
-	$func = sub { $msg .= "$_[0]\n" };
-    }
-    run_command(['btrfs', '-q', @$cmd], errmsg => 'btrfs error', outfunc => $func);
-
-    return $msg;
-}
-
-sub btrfs_get_subvol_id {
-    my ($class, $path) = @_;
-    my $info = $class->btrfs_cmd(['subvolume', 'show', '--', $path]);
-    if ($info !~ /^\s*(?:Object|Subvolume) ID:\s*(\d+)$/m) {
-	die "failed to get btrfs subvolume ID from: $info\n";
-    }
-    return $1;
-}
-
-my sub chattr : prototype($$$) {
-    my ($fh, $mask, $xor) = @_;
-
-    my $flags = pack('L!', 0);
-    ioctl($fh, FS_IOC_GETFLAGS, $flags) or die "FS_IOC_GETFLAGS failed - $!\n";
-    $flags = pack('L!', (unpack('L!', $flags) & $mask) ^ $xor);
-    ioctl($fh, FS_IOC_SETFLAGS, $flags) or die "FS_IOC_SETFLAGS failed - $!\n";
-    return 1;
-}
-
-sub create_base {
-    my ($class, $storeid, $scfg, $volname) = @_;
-
-    my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $format) =
-	$class->parse_volname($volname);
-
-    my $newname = $name;
-    $newname =~ s/^vm-/base-/;
-
-    # If we're not working with a 'raw' file, which is the only thing that's "different" for btrfs,
-    # or a subvolume, we forward to the DirPlugin
-    if ($format ne 'raw' && $format ne 'subvol') {
-	return PVE::Storage::DirPlugin::create_base(@_);
-    }
-
-    my $path = $class->filesystem_path($scfg, $volname);
-    my $newvolname = $basename ? "$basevmid/$basename/$vmid/$newname" : "$vmid/$newname";
-    my $newpath = $class->filesystem_path($scfg, $newvolname);
-
-    my $subvol = $path;
-    my $newsubvol = $newpath;
-    if ($format eq 'raw') {
-	$subvol = raw_file_to_subvol($subvol);
-	$newsubvol = raw_file_to_subvol($newsubvol);
-    }
-
-    rename($subvol, $newsubvol)
-	|| die "rename '$subvol' to '$newsubvol' failed - $!\n";
-    eval { $class->btrfs_cmd(['property', 'set', $newsubvol, 'ro', 'true']) };
-    warn $@ if $@;
-
-    return $newvolname;
-}
-
-sub clone_image {
-    my ($class, $scfg, $storeid, $volname, $vmid, $snap) = @_;
-
-    my ($vtype, $basename, $basevmid, undef, undef, $isBase, $format) =
-	$class->parse_volname($volname);
-
-    # If we're not working with a 'raw' file, which is the only thing that's "different" for btrfs,
-    # or a subvolume, we forward to the DirPlugin
-    if ($format ne 'raw' && $format ne 'subvol') {
-	return PVE::Storage::DirPlugin::clone_image(@_);
-    }
-
-    my $imagedir = $class->get_subdir($scfg, 'images');
-    $imagedir .= "/$vmid";
-    mkpath $imagedir;
-
-    my $path = $class->filesystem_path($scfg, $volname);
-    my $newname = $class->find_free_diskname($storeid, $scfg, $vmid, $format, 1);
-
-    # For btrfs subvolumes we don't actually need the "link":
-    #my $newvolname = "$basevmid/$basename/$vmid/$newname";
-    my $newvolname = "$vmid/$newname";
-    my $newpath = $class->filesystem_path($scfg, $newvolname);
-
-    my $subvol = $path;
-    my $newsubvol = $newpath;
-    if ($format eq 'raw') {
-	$subvol = raw_file_to_subvol($subvol);
-	$newsubvol = raw_file_to_subvol($newsubvol);
-    }
-
-    $class->btrfs_cmd(['subvolume', 'snapshot', '--', $subvol, $newsubvol]);
-
-    return $newvolname;
-}
-
-sub alloc_image {
-    my ($class, $storeid, $scfg, $vmid, $fmt, $name, $size) = @_;
-
-    if ($fmt ne 'raw' && $fmt ne 'subvol') {
-	return PVE::Storage::DirPlugin::alloc_image(@_);
-    }
-
-    # From Plugin.pm:
-
-    my $imagedir = $class->get_subdir($scfg, 'images') . "/$vmid";
-
-    mkpath $imagedir;
-
-    $name = $class->find_free_diskname($storeid, $scfg, $vmid, $fmt, 1) if !$name;
-
-    my (undef, $tmpfmt) = PVE::Storage::Plugin::parse_name_dir($name);
-
-    die "illegal name '$name' - wrong extension for format ('$tmpfmt != '$fmt')\n"
-	if $tmpfmt ne $fmt;
-
-    # End copy from Plugin.pm
-
-    my $subvol = "$imagedir/$name";
-    # .raw is not part of the directory name
-    $subvol =~ s/\.raw$//;
-
-    die "disk image '$subvol' already exists\n" if -e $subvol;
-
-    my $path;
-    if ($fmt eq 'raw') {
-	$path = "$subvol/disk.raw";
-    }
-
-    if ($fmt eq 'subvol' && !!$size) {
-	# NOTE: `btrfs send/recv` actually drops quota information so supporting subvolumes with
-	# quotas doesn't play nice with send/recv.
-	die "btrfs quotas are currently not supported, use an unsized subvolume or a raw file\n";
-    }
-
-    $class->btrfs_cmd(['subvolume', 'create', '--', $subvol]);
-
-    eval {
-	if ($fmt eq 'subvol') {
-	    # Nothing to do for now...
-
-	    # This is how we *would* do it:
-	    # # Use the subvol's default 0/$id qgroup
-	    # eval {
-	    #     # This call should happen at storage creation instead and therefore governed by a
-	    #     # configuration option!
-	    #     # $class->btrfs_cmd(['quota', 'enable', $subvol]);
-	    #     my $id = $class->btrfs_get_subvol_id($subvol);
-	    #     $class->btrfs_cmd(['qgroup', 'limit', "${size}k", "0/$id", $subvol]);
-	    # };
-	} elsif ($fmt eq 'raw') {
-	    sysopen my $fh, $path, O_WRONLY | O_CREAT | O_EXCL
-		or die "failed to create raw file '$path' - $!\n";
-	    chattr($fh, ~FS_NOCOW_FL, FS_NOCOW_FL) if $scfg->{nocow};
-	    truncate($fh, $size * 1024)
-		or die "failed to set file size for '$path' - $!\n";
-	    close($fh);
-	} else {
-	    die "internal format error (format = $fmt)\n";
-	}
-    };
-
-    if (my $err = $@) {
-	eval { $class->btrfs_cmd(['subvolume', 'delete', '--', $subvol]); };
-	warn $@ if $@;
-	die $err;
-    }
-
-    return "$vmid/$name";
-}
-
-# Same as btrfsprogs does:
-my sub path_is_subvolume : prototype($) {
-    my ($path) = @_;
-    my @stat = stat($path)
-	or die "stat failed on '$path' - $!\n";
-    my ($ino, $mode) = @stat[1, 2];
-    return S_ISDIR($mode) && $ino == BTRFS_FIRST_FREE_OBJECTID;
-}
-
-my $BTRFS_VOL_REGEX = qr/((?:vm|base|subvol)-\d+-disk-\d+(?:\.subvol)?)(?:\@(\S+))$/;
-
-# Calls `$code->($volume, $name, $snapshot)` for each subvol in a directory matching our volume
-# regex.
-my sub foreach_subvol : prototype($$) {
-    my ($dir, $code) = @_;
-
-    dir_glob_foreach($dir, $BTRFS_VOL_REGEX, sub {
-	my ($volume, $name, $snapshot) = ($1, $2, $3);
-	return if !path_is_subvolume("$dir/$volume");
-	$code->($volume, $name, $snapshot);
-    })
-}
-
-sub free_image {
-    my ($class, $storeid, $scfg, $volname, $isBase, $_format) = @_;
-
-    my (undef, undef, $vmid, undef, undef, undef, $format) =
-	$class->parse_volname($volname);
-
-    if ($format ne 'subvol' && $format ne 'raw') {
-	return PVE::Storage::DirPlugin::free_image(@_);
-    }
-
-    my $path = $class->filesystem_path($scfg, $volname);
-
-    my $subvol = $path;
-    if ($format eq 'raw') {
-	$subvol = raw_file_to_subvol($path);
-    }
-
-    my $dir = dirname($subvol);
-    my @snapshot_vols;
-    foreach_subvol($dir, sub {
-	my ($volume, $name, $snapshot) = @_;
-	return if !defined $snapshot;
-	push @snapshot_vols, "$dir/$volume";
-    });
-
-    $class->btrfs_cmd(['subvolume', 'delete', '--', @snapshot_vols, $subvol]);
-    # try to cleanup directory to not clutter storage with empty $vmid dirs if
-    # all images from a guest got deleted
-    rmdir($dir);
-
-    return undef;
-}
-
-# Currently not used because quotas clash with send/recv.
-# my sub btrfs_subvol_quota {
-#     my ($class, $path) = @_;
-#     my $id = '0/' . $class->btrfs_get_subvol_id($path);
-#     my $search = qr/^\Q$id\E\s+(\d)+\s+\d+\s+(\d+)\s*$/;
-#     my ($used, $size);
-#     $class->btrfs_cmd(['qgroup', 'show', '--raw', '-rf', '--', $path], sub {
-# 	return if defined($size);
-# 	if ($_[0] =~ $search) {
-# 	    ($used, $size) = ($1, $2);
-# 	}
-#     });
-#     if (!defined($size)) {
-# 	# syslog should include more information:
-# 	syslog('err', "failed to get subvolume size for: $path (id $id)");
-# 	# UI should only see the last path component:
-# 	$path =~ s|^.*/||;
-# 	die "failed to get subvolume size for $path\n";
-#     }
-#     return wantarray ? ($used, $size) : $size;
-# }
-
-sub volume_size_info {
-    my ($class, $scfg, $storeid, $volname, $timeout) = @_;
-
-    my $path = $class->filesystem_path($scfg, $volname);
-
-    my $format = ($class->parse_volname($volname))[6];
-
-    if ($format eq 'subvol') {
-	my $ctime = (stat($path))[10];
-	my ($used, $size) = (0, 0);
-	#my ($used, $size) = btrfs_subvol_quota($class, $path); # uses wantarray
-	return wantarray ? ($size, 'subvol', $used, undef, $ctime) : 1;
-    }
-
-    return PVE::Storage::Plugin::file_size_info($path, $timeout);
-}
-
-sub volume_resize {
-    my ($class, $scfg, $storeid, $volname, $size, $running) = @_;
-
-    my $format = ($class->parse_volname($volname))[6];
-    if ($format eq 'subvol') {
-	my $path = $class->filesystem_path($scfg, $volname);
-	my $id = '0/' . $class->btrfs_get_subvol_id($path);
-	$class->btrfs_cmd(['qgroup', 'limit', '--', "${size}k", "0/$id", $path]);
-	return undef;
-    }
-
-    return PVE::Storage::Plugin::volume_resize(@_);
-}
-
-sub volume_snapshot {
-    my ($class, $scfg, $storeid, $volname, $snap) = @_;
-
-    my ($name, $vmid, $format) = ($class->parse_volname($volname))[1,2,6];
-    if ($format ne 'subvol' && $format ne 'raw') {
-	return PVE::Storage::Plugin::volume_snapshot(@_);
-    }
-
-    my $path = $class->filesystem_path($scfg, $volname);
-    my $snap_path = $class->filesystem_path($scfg, $volname, $snap);
-
-    if ($format eq 'raw') {
-	$path = raw_file_to_subvol($path);
-	$snap_path = raw_file_to_subvol($snap_path);
-    }
-
-    my $snapshot_dir = $class->get_subdir($scfg, 'images') . "/$vmid";
-    mkpath $snapshot_dir;
-
-    $class->btrfs_cmd(['subvolume', 'snapshot', '-r', '--', $path, $snap_path]);
-    return undef;
-}
-
-sub volume_rollback_is_possible {
-    my ($class, $scfg, $storeid, $volname, $snap) = @_; 
-
-    return 1; 
-}
-
-sub volume_snapshot_rollback {
-    my ($class, $scfg, $storeid, $volname, $snap) = @_;
-
-    my ($name, $format) = ($class->parse_volname($volname))[1,6];
-
-    if ($format ne 'subvol' && $format ne 'raw') {
-	return PVE::Storage::Plugin::volume_snapshot_rollback(@_);
-    }
-
-    my $path = $class->filesystem_path($scfg, $volname);
-    my $snap_path = $class->filesystem_path($scfg, $volname, $snap);
-
-    if ($format eq 'raw') {
-	$path = raw_file_to_subvol($path);
-	$snap_path = raw_file_to_subvol($snap_path);
-    }
-
-    # Simple version would be:
-    #   rename old to temp
-    #   create new
-    #   on error rename temp back
-    # But for atomicity in case the rename after create-failure *also* fails, we create the new
-    # subvol first, then use RENAME_EXCHANGE, 
-    my $tmp_path = "$path.tmp.$$";
-    $class->btrfs_cmd(['subvolume', 'snapshot', '--', $snap_path, $tmp_path]);
-    # The paths are absolute, so pass -1 as file descriptors.
-    my $ok = PVE::Tools::renameat2(-1, $tmp_path, -1, $path, &PVE::Tools::RENAME_EXCHANGE);
-
-    eval { $class->btrfs_cmd(['subvolume', 'delete', '--', $tmp_path]) };
-    warn "failed to remove '$tmp_path' subvolume: $@" if $@;
-
-    if (!$ok) {
-	die "failed to rotate '$tmp_path' into place at '$path' - $!\n";
-    }
-
-    return undef;
-}
-
-sub volume_snapshot_delete {
-    my ($class, $scfg, $storeid, $volname, $snap, $running) = @_;
-
-    my ($name, $vmid, $format) = ($class->parse_volname($volname))[1,2,6];
-
-    if ($format ne 'subvol' && $format ne 'raw') {
-	return PVE::Storage::Plugin::volume_snapshot_delete(@_);
-    }
-
-    my $path = $class->filesystem_path($scfg, $volname, $snap);
-
-    if ($format eq 'raw') {
-	$path = raw_file_to_subvol($path);
-    }
-
-    $class->btrfs_cmd(['subvolume', 'delete', '--', $path]);
-
-    return undef;
-}
-
-sub volume_has_feature {
-    my ($class, $scfg, $feature, $storeid, $volname, $snapname, $running) = @_;
-
-    my $features = {
-	snapshot => {
-	    current => { qcow2 => 1, raw => 1, subvol => 1 },
-	    snap => { qcow2 => 1, raw => 1, subvol => 1 }
-	},
-	clone => {
-	    base => { qcow2 => 1, raw => 1, subvol => 1, vmdk => 1 },
-	    current => { raw => 1 },
-	    snap => { raw => 1 },
-	},
-	template => { current => { qcow2 => 1, raw => 1, vmdk => 1, subvol => 1 } },
-	copy => {
-	    base => { qcow2 => 1, raw => 1, subvol => 1, vmdk => 1 },
-	    current => { qcow2 => 1, raw => 1, subvol => 1, vmdk => 1 },
-	    snap => { qcow2 => 1, raw => 1, subvol => 1 },
-	},
-	sparseinit => { base => {qcow2 => 1, raw => 1, vmdk => 1 },
-			current => {qcow2 => 1, raw => 1, vmdk => 1 } },
-    };
-
-    my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $format) =
-	$class->parse_volname($volname);
-
-    my $key = undef;
-    if ($snapname) {
-        $key = 'snap';
-    } else {
-        $key =  $isBase ? 'base' : 'current';
-    }
-
-    return 1 if defined($features->{$feature}->{$key}->{$format});
-
-    return undef;
-}
-
-sub list_images {
-    my ($class, $storeid, $scfg, $vmid, $vollist, $cache) = @_;
-    my $imagedir = $class->get_subdir($scfg, 'images');
-
-    my $res = [];
-
-    # Copied from Plugin.pm, with file_size_info calls adapted:
-    foreach my $fn (<$imagedir/[0-9][0-9]*/*>) {
-	# different to in Plugin.pm the regex below also excludes '@' as valid file name
-	next if $fn !~ m@^(/.+/(\d+)/([^/\@.]+(?:\.(qcow2|vmdk|subvol))?))$@;
-	$fn = $1; # untaint
-
-	my $owner = $2;
-	my $name = $3;
-	my $ext = $4;
-
-	next if !$vollist && defined($vmid) && ($owner ne $vmid);
-
-	my $volid = "$storeid:$owner/$name";
-	my ($size, $format, $used, $parent, $ctime);
-
-	if (!$ext) { # raw
-	    $volid .= '.raw';
-	    ($size, $format, $used, $parent, $ctime) = PVE::Storage::Plugin::file_size_info("$fn/disk.raw");
-	} elsif ($ext eq 'subvol') {
-	    ($used, $size) = (0, 0);
-	    #($used, $size) = btrfs_subvol_quota($class, $fn);
-	    $format = 'subvol';
-	} else {
-	    ($size, $format, $used, $parent, $ctime) = PVE::Storage::Plugin::file_size_info($fn);
-	}
-	next if !($format && defined($size));
-
-	if ($vollist) {
-	    next if ! grep { $_ eq $volid } @$vollist;
-	}
-
-	my $info = {
-	    volid => $volid, format => $format,
-	    size => $size, vmid => $owner, used => $used, parent => $parent,
-	};
-
-        $info->{ctime} = $ctime if $ctime;
-
-        push @$res, $info;
-    }
-
-    return $res;
-}
-
-sub volume_export_formats {
-    my ($class, $scfg, $storeid, $volname, $snapshot, $base_snapshot, $with_snapshots) = @_;
-
-    # We can do whatever `DirPlugin` can do.
-    my @result = PVE::Storage::Plugin::volume_export_formats(@_);
-
-    # `btrfs send` only works on snapshots:
-    return @result if !defined $snapshot;
-
-    # Incremental stream with snapshots is only supported if the snapshots are listed (new api):
-    return @result if defined($base_snapshot) && $with_snapshots && ref($with_snapshots) ne 'ARRAY';
-
-    # Otherwise we do also support `with_snapshots`.
-
-    # Finally, `btrfs send` only works on formats where we actually use btrfs subvolumes:
-    my $format = ($class->parse_volname($volname))[6];
-    return @result if $format ne 'raw' && $format ne 'subvol';
-
-    return ('btrfs', @result);
-}
-
-sub volume_import_formats {
-    my ($class, $scfg, $storeid, $volname, $snapshot, $base_snapshot, $with_snapshots) = @_;
-
-    # Same as export-formats, beware the parameter order:
-    return volume_export_formats(
-	$class,
-	$scfg,
-	$storeid,
-	$volname,
-	$snapshot,
-	$base_snapshot,
-	$with_snapshots,
-    );
-}
-
-sub volume_export {
-    my (
-	$class,
-	$scfg,
-	$storeid,
-	$fh,
-	$volname,
-	$format,
-	$snapshot,
-	$base_snapshot,
-	$with_snapshots,
-    ) = @_;
-
-    if ($format ne 'btrfs') {
-	return PVE::Storage::Plugin::volume_export(@_);
-    }
-
-    die "format 'btrfs' only works on snapshots\n"
-	if !defined $snapshot;
-
-    die "'btrfs' format in incremental mode requires snapshots to be listed explicitly\n"
-	if defined($base_snapshot) && $with_snapshots && ref($with_snapshots) ne 'ARRAY';
-
-    my $volume_format = ($class->parse_volname($volname))[6];
-
-    die "btrfs-sending volumes of type $volume_format ('$volname') is not supported\n"
-	if $volume_format ne 'raw' && $volume_format ne 'subvol';
-
-    my $path = $class->path($scfg, $volname, $storeid);
-
-    if ($volume_format eq 'raw') {
-	$path = raw_file_to_subvol($path);
-    }
-
-    my $cmd = ['btrfs', '-q', 'send', '-e'];
-    if ($base_snapshot) {
-	my $base = $class->path($scfg, $volname, $storeid, $base_snapshot);
-	if ($volume_format eq 'raw') {
-	    $base = raw_file_to_subvol($base);
-	}
-	push @$cmd, '-p', $base;
-    }
-    push @$cmd, '--';
-    if (ref($with_snapshots) eq 'ARRAY') {
-	push @$cmd, (map { "$path\@$_" } ($with_snapshots // [])->@*), $path;
-    } else {
-	dir_glob_foreach(dirname($path), $BTRFS_VOL_REGEX, sub {
-	    push @$cmd, "$path\@$_[2]" if !(defined($snapshot) && $_[2] eq $snapshot);
-	});
-    }
-    $path .= "\@$snapshot" if defined($snapshot);
-    push @$cmd, $path;
-
-    run_command($cmd, output => '>&'.fileno($fh));
-    return;
-}
-
-sub volume_import {
-    my (
-	$class,
-	$scfg,
-	$storeid,
-	$fh,
-	$volname,
-	$format,
-	$snapshot,
-	$base_snapshot,
-	$with_snapshots,
-	$allow_rename,
-    ) = @_;
-
-    if ($format ne 'btrfs') {
-	return PVE::Storage::Plugin::volume_import(@_);
-    }
-
-    die "format 'btrfs' only works on snapshots\n"
-	if !defined $snapshot;
-
-    my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $volume_format) =
-	$class->parse_volname($volname);
-
-    die "btrfs-receiving volumes of type $volume_format ('$volname') is not supported\n"
-	if $volume_format ne 'raw' && $volume_format ne 'subvol';
-
-    if (defined($base_snapshot)) {
-	my $path = $class->path($scfg, $volname, $storeid, $base_snapshot);
-	die "base snapshot '$base_snapshot' not found - no such directory '$path'\n"
-	    if !path_is_subvolume($path);
-    }
-
-    my $destination = $class->filesystem_path($scfg, $volname);
-    if ($volume_format eq 'raw') {
-	$destination = raw_file_to_subvol($destination);
-    }
-
-    if (!defined($base_snapshot) && -e $destination) {
-	die "volume $volname already exists\n" if !$allow_rename;
-	$volname = $class->find_free_diskname($storeid, $scfg, $vmid, $volume_format, 1);
-    }
-
-    my $imagedir = $class->get_subdir($scfg, $vtype);
-    $imagedir .= "/$vmid" if $vtype eq 'images';
-
-    my $tmppath = "$imagedir/recv.$vmid.tmp";
-    mkdir($imagedir); # FIXME: if $scfg->{mkdir};
-    if (!mkdir($tmppath)) {
-	die "temp receive directory already exists at '$tmppath', incomplete concurrent import?\n"
-	    if $! == EEXIST;
-	die "failed to create temporary receive directory at '$tmppath' - $!\n";
-    }
-
-    my $dh = IO::Dir->new($tmppath)
-	or die "failed to open temporary receive directory '$tmppath' - $!\n";
-    eval {
-	run_command(['btrfs', '-q', 'receive', '-e', '--', $tmppath], input => '<&'.fileno($fh));
-
-	# Analyze the received subvolumes;
-	my ($diskname, $found_snapshot, @snapshots);
-	$dh->rewind;
-	while (defined(my $entry = $dh->read)) {
-	    next if $entry eq '.' || $entry eq '..';
-	    next if $entry !~ /^$BTRFS_VOL_REGEX$/;
-	    my ($cur_diskname, $cur_snapshot) = ($1, $2);
-
-	    die "send stream included a non-snapshot subvolume\n"
-		if !defined($cur_snapshot);
-
-	    if (!defined($diskname)) {
-		$diskname = $cur_diskname;
-	    } else {
-		die "multiple disks contained in stream ('$diskname' vs '$cur_diskname')\n"
-		    if $diskname ne $cur_diskname;
-	    }
-
-	    if ($cur_snapshot eq $snapshot) {
-		$found_snapshot = 1;
-	    } else {
-		push @snapshots, $cur_snapshot;
-	    }
-	}
-
-	die "send stream did not contain the expected current snapshot '$snapshot'\n"
-	    if !$found_snapshot;
-
-	# Rotate the disk into place, first the current state:
-	# Note that read-only subvolumes cannot be moved into different directories, but for the
-	# "current" state we also want a writable copy, so start with that:
-	$class->btrfs_cmd(['property', 'set', "$tmppath/$diskname\@$snapshot", 'ro', 'false']);
-	PVE::Tools::renameat2(
-	    -1,
-	    "$tmppath/$diskname\@$snapshot",
-	    -1,
-	    $destination,
-	    &PVE::Tools::RENAME_NOREPLACE,
-	) or die "failed to move received snapshot '$tmppath/$diskname\@$snapshot'"
-	    . " into place at '$destination' - $!\n";
-
-	# Now recreate the actual snapshot:
-	$class->btrfs_cmd([
-	    'subvolume',
-	    'snapshot',
-	    '-r',
-	    '--',
-	    $destination,
-	    "$destination\@$snapshot",
-	]);
-
-	# Now go through the remaining snapshots (if any)
-	foreach my $snap (@snapshots) {
-	    $class->btrfs_cmd(['property', 'set', "$tmppath/$diskname\@$snap", 'ro', 'false']);
-	    PVE::Tools::renameat2(
-		-1,
-		"$tmppath/$diskname\@$snap",
-		-1,
-		"$destination\@$snap",
-		&PVE::Tools::RENAME_NOREPLACE,
-	    ) or die "failed to move received snapshot '$tmppath/$diskname\@$snap'"
-		. " into place at '$destination\@$snap' - $!\n";
-	    eval { $class->btrfs_cmd(['property', 'set', "$destination\@$snap", 'ro', 'true']) };
-	    warn "failed to make $destination\@$snap read-only - $!\n" if $@;
-	}
-    };
-    my $err = $@;
-
-    eval {
-	# Cleanup all the received snapshots we did not move into place, so we can remove the temp
-	# directory.
-	if ($dh) {
-	    $dh->rewind;
-	    while (defined(my $entry = $dh->read)) {
-		next if $entry eq '.' || $entry eq '..';
-		eval { $class->btrfs_cmd(['subvolume', 'delete', '--', "$tmppath/$entry"]) };
-		warn $@ if $@;
-	    }
-	    $dh->close; undef $dh;
-	}
-	if (!rmdir($tmppath)) {
-	    warn "failed to remove temporary directory '$tmppath' - $!\n"
-	}
-    };
-    warn $@ if $@;
-    if ($err) {
-	# clean up if the directory ended up being empty after an error
-	rmdir($tmppath);
-	die $err;
-    }
-
-    return "$storeid:$volname";
-}
-
-1