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drives: expose 'readonly' flag of qemu for scsi/virtio

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this allows a user to set a drive to 'read-only'. This can be useful
if a disk should not be written to, or if the backing file/source is
not writable (like a mapped pbs backup to /dev/loopX).

the option is named 'ro', to achieve consistency with containers

while this could also be achieved by setting 'snapshot=1', this would
create a temporary file in /var/tmp which can get quite big.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak 2021-10-27 13:35:27 +02:00 committed by Thomas Lamprecht
parent 6a5589010e
commit 12e1d472e3
2 changed files with 17 additions and 0 deletions
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6
PVE/QemuServer.pm
View File

@ -1597,6 +1597,12 @@ sub print_drive_commandline_full {
$opts .= ",snapshot=$v";
}
# ro is 'readonly', and only accepts on|off
if (defined($drive->{ro})) {
my $v = $drive->{ro} ? 'on' : 'off';
$opts .= ",readonly=$v";
}
foreach my $type (['', '-total'], [_rd => '-read'], [_wr => '-write']) {
my ($dir, $qmpname) = @$type;
if (my $v = $drive->{"mbps$dir"}) {

11
PVE/QemuServer/Drive.pm
View File

@ -175,6 +175,14 @@ my %queues_fmt = (
}
);
my %readonly_fmt = (
ro => {
type => 'boolean',
description => "Whether the drive is read-only.",
optional => 1,
},
);
my %scsiblock_fmt = (
scsiblock => {
type => 'boolean',
@ -269,6 +277,7 @@ my $scsi_fmt = {
%drivedesc_base,
%iothread_fmt,
%queues_fmt,
%readonly_fmt,
%scsiblock_fmt,
%ssd_fmt,
%wwn_fmt,
@ -297,6 +306,7 @@ PVE::JSONSchema::register_standard_option("pve-qm-sata", $satadesc);
my $virtio_fmt = {
%drivedesc_base,
%iothread_fmt,
%readonly_fmt,
};
my $virtiodesc = {
optional => 1,
@ -399,6 +409,7 @@ my $alldrive_fmt = {
%iothread_fmt,
%model_fmt,
%queues_fmt,
%readonly_fmt,
%scsiblock_fmt,
%ssd_fmt,
%wwn_fmt,