[pve-devel] [PATCH container] fix #5761: add the "discard" mount option

[Filip Schauer]

Introduce the "discard" mount option for rootfs and mount points. This
ensures that unused container volume blocks are discarded from the
underlying storage backend when deleting files within the container.

Signed-off-by: Filip Schauer <f.schauer at proxmox.com>
---
 src/PVE/LXC/Config.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PVE/LXC/Config.pm b/src/PVE/LXC/Config.pm
index ce64c4c..e980f8a 100644
--- a/src/PVE/LXC/Config.pm
+++ b/src/PVE/LXC/Config.pm
@@ -311,7 +311,7 @@ sub __snapshot_rollback_get_unused {
 cfs_register_file('/lxc/', \&parse_pct_config, \&write_pct_config);
 
 
-my $valid_mount_option_re = qr/(noatime|lazytime|nodev|nosuid|noexec)/;
+my $valid_mount_option_re = qr/(discard|lazytime|noatime|nodev|noexec|nosuid)/;
 
 sub is_valid_mount_option {
     my ($option) = @_;
-- 
2.39.5