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lvm: import/export: implement raw+size format

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This commit is contained in:
Wolfgang Bumiller
2017-06-21 14:59:37 +02:00
committed by Dietmar Maurer
parent 9559a62a3d
commit 5cbbc78fdb
1 changed files with 73 additions and 0 deletions
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73
PVE/Storage/LVMPlugin.pm
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@ -503,4 +503,77 @@ sub volume_has_feature {
return undef;
}
sub volume_export_formats {
my ($class, $scfg, $storeid, $volname, $snapshot, $base_snapshot, $with_snapshots) = @_;
return () if defined($snapshot); # lvm-thin only
return volume_import_formats($class, $scfg, $storeid, $volname, $base_snapshot, $with_snapshots);
}
sub volume_export {
my ($class, $scfg, $storeid, $fh, $volname, $format, $snapshot, $base_snapshot, $with_snapshots) = @_;
die "volume export format $format not available for $class\n"
if $format ne 'raw+size';
die "cannot export volumes together with their snapshots in $class\n"
if $with_snapshots;
die "cannot export a snapshot in $class\n" if defined($snapshot);
die "cannot export an incremental stream in $class\n" if defined($base_snapshot);
my $file = $class->path($scfg, $volname, $storeid);
my $size;
# should be faster than querying LVM, also checks for the device file's availability
run_command(['/sbin/blockdev', '--getsize64', $file], outfunc => sub {
my ($line) = @_;
die "unexpected output from /sbin/blockdev: $line\n" if $line !~ /^(\d+)$/;
$size = int($1);
});
PVE::Storage::Plugin::write_common_header($fh, $size);
run_command(['dd', "if=$file", "bs=64k"], output => '>&'.fileno($fh));
}
sub volume_import_formats {
my ($class, $scfg, $storeid, $volname, $base_snapshot, $with_snapshots) = @_;
return () if $with_snapshots; # not supported
return () if defined($base_snapshot); # not supported
return ('raw+size');
}
sub volume_import {
my ($class, $scfg, $storeid, $fh, $volname, $format, $base_snapshot, $with_snapshots) = @_;
die "volume import format $format not available for $class\n"
if $format ne 'raw+size';
die "cannot import volumes together with their snapshots in $class\n"
if $with_snapshots;
die "cannot import an incremental stream in $class\n" if defined($base_snapshot);
my ($vtype, $name, $vmid, $basename, $basevmid, $isBase, $file_format) =
$class->parse_volname($volname);
die "cannot import format $format into a file of format $file_format\n"
if $file_format ne 'raw';
my $vg = $scfg->{vgname};
my $lvs = lvm_list_volumes($vg);
die "volume $vg/$volname already exists\n"
if $lvs->{$vg}->{$volname};
my ($size) = PVE::Storage::Plugin::read_common_header($fh);
$size = int($size/1024);
eval {
my $allocname = $class->alloc_image($storeid, $scfg, $vmid, 'raw', $name, $size);
if ($allocname ne $volname) {
my $oldname = $volname;
$volname = $allocname; # Let the cleanup code know what to free
die "internal error: unexpected allocated name: '$allocname' != '$oldname'\n";
}
my $file = $class->path($scfg, $volname, $storeid)
or die "internal error: failed to get path to newly allocated volume $volname\n";
run_command(['dd', "of=$file", 'conv=sparse', 'bs=64k'],
input => '<&'.fileno($fh));
};
if (my $err = $@) {
eval { $class->free_image($storeid, $scfg, $volname, 0) };
warn $@ if $@;
die $err;
}
}
1;