[pve-devel] [PATCH storage 5/6] btrfs: die early for broken subvolume resize

[Fiona Ebner]

In the BTRFS plugin, resize_volume() for a subovlume currently fails
with "failed to get btrfs subvolume ID from: ". This is because the
btrfs 'subvol show' command is invoked with '-q', so there is no
output.

As btrfs quotas are currently not implemented, die early with a clean
error instead.

Signed-off-by: Fiona Ebner <f.ebner at proxmox.com>
---
 src/PVE/Storage/BTRFSPlugin.pm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/PVE/Storage/BTRFSPlugin.pm b/src/PVE/Storage/BTRFSPlugin.pm
index b1f7912..db678cf 100644
--- a/src/PVE/Storage/BTRFSPlugin.pm
+++ b/src/PVE/Storage/BTRFSPlugin.pm
@@ -497,6 +497,9 @@ sub volume_resize {
 
     my $format = ($class->parse_volname($volname))[6];
     if ($format eq 'subvol') {
+	# NOTE: `btrfs send/recv` actually drops quota information so supporting subvolumes with
+	# quotas doesn't play nice with send/recv.
+	die "cannot resize subvolume - btrfs quotas are currently not supported\n";
 	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]);
-- 
2.39.5