[pve-devel] [PATCH v2 storage] api: fix get content call for volumes

[Christian Ebner <c.ebner@proxmox.com>]

`pvesh get /nodes/{node}/storage/{storage}/content/{volume}` failed for
several storage types, because the respective storage plugins returned
only the volumes `size` on `volume_size_info` calls, while also the format
is required.

This patch fixes the issue by returning also `format` and where possible `used`.

The issue was reported in the forum:
https://forum.proxmox.com/threads/pvesh-get-nodes-node-storage-storage-content-volume-returns-error.123747/

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---

Changes since v1:
 * Remove errous check for $used being set, rely on fallback to 0 if undef
 * Return `parent` for RBD and ZFS
 * Return `used` for ZFS

 PVE/Storage/ISCSIDirectPlugin.pm | 2 +-
 PVE/Storage/RBDPlugin.pm         | 4 ++--
 PVE/Storage/ZFSPoolPlugin.pm     | 8 ++++++--
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/PVE/Storage/ISCSIDirectPlugin.pm b/PVE/Storage/ISCSIDirectPlugin.pm
index 9777969..eb329d4 100644
--- a/PVE/Storage/ISCSIDirectPlugin.pm
+++ b/PVE/Storage/ISCSIDirectPlugin.pm
@@ -208,7 +208,7 @@ sub volume_size_info {
     my $vollist = iscsi_ls($scfg,$storeid);
     my $info = $vollist->{$storeid}->{$volname};
 
-    return $info->{size};
+    return wantarray ? ($info->{size}, 'raw', 0, undef) : $info->{size};
 }
 
 sub volume_resize {
diff --git a/PVE/Storage/RBDPlugin.pm b/PVE/Storage/RBDPlugin.pm
index 9047504..e7a2137 100644
--- a/PVE/Storage/RBDPlugin.pm
+++ b/PVE/Storage/RBDPlugin.pm
@@ -729,8 +729,8 @@ sub volume_size_info {
     my ($class, $scfg, $storeid, $volname, $timeout) = @_;
 
     my ($vtype, $name, $vmid) = $class->parse_volname($volname);
-    my ($size, undef) = rbd_volume_info($scfg, $storeid, $name);
-    return $size;
+    my ($size, $parent) = rbd_volume_info($scfg, $storeid, $name);
+    return wantarray ? ($size, 'raw', 0, $parent) : $size;
 }
 
 sub volume_resize {
diff --git a/PVE/Storage/ZFSPoolPlugin.pm b/PVE/Storage/ZFSPoolPlugin.pm
index 9fbd149..acc50d9 100644
--- a/PVE/Storage/ZFSPoolPlugin.pm
+++ b/PVE/Storage/ZFSPoolPlugin.pm
@@ -446,13 +446,17 @@ sub status {
 sub volume_size_info {
     my ($class, $scfg, $storeid, $volname, $timeout) = @_;
 
-    my (undef, $vname, undef, undef, undef, undef, $format) =
+    my (undef, $vname, undef, $parent, undef, undef, $format) =
         $class->parse_volname($volname);
 
     my $attr = $format eq 'subvol' ? 'refquota' : 'volsize';
     my $value = $class->zfs_get_properties($scfg, $attr, "$scfg->{pool}/$vname");
+    my $used = $class->zfs_get_properties($scfg, 'used', "$scfg->{pool}/$vname");
+
+    $used = ($used =~ /^(\d+)$/) ? $1 : 0;
+    
     if ($value =~ /^(\d+)$/) {
-	return $1;
+	return wantarray ? ($1, $format, $used, $parent) : $1;
     }
 
     die "Could not get zfs volume size\n";
-- 
2.30.2