[pve-devel] [PATCH v2 storage] zfs: use -r parameter when listing snapshots

Fabian Ebner f.ebner at proxmox.com
Mon Jan 10 12:50:44 CET 2022

Some versions of ZFS do not automatically display the child snapshots
when '-t snapshot' is used, but require '-r' to be present
additionally[1]. And in general, it's cleaner to specify the flag

Because of that, commit ac5c1af led to a regression[0] in the context
of ZFS over iSCSI with zfs_get_sorted_snapshot_list. Fix it, by adding
a -r flag again.

The volume_snapshot_info function is currently only used in the
context of replication and that requires a local ZFS pool, but it
would be affected by the same issue if it is ever used in the context
of ZFS over iSCSI, so also add -r there.

[0]: https://forum.proxmox.com/threads/102683/
[1]: https://forum.proxmox.com/threads/102683/post-442577

Fixes: 8c20d8a ("plugin: add volume_snapshot_info function")
Fixes: ac5c1af ("zfspool: add zfs_get_sorted_snapshot_list helper")
Signed-off-by: Fabian Ebner <f.ebner at proxmox.com>

Changes from v1:
    * Add -r in volume_snapshot_info too.

 PVE/Storage/ZFSPoolPlugin.pm | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/PVE/Storage/ZFSPoolPlugin.pm b/PVE/Storage/ZFSPoolPlugin.pm
index 5f6befd..e952a5c 100644
--- a/PVE/Storage/ZFSPoolPlugin.pm
+++ b/PVE/Storage/ZFSPoolPlugin.pm
@@ -398,9 +398,11 @@ sub zfs_list_zvol {
 sub zfs_get_sorted_snapshot_list {
     my ($class, $scfg, $volname, $sort_params) = @_;
+    my @params = ('-H', '-r', '-t', 'snapshot', '-o', 'name', $sort_params->@*);
     my $vname = ($class->parse_volname($volname))[1];
+    push @params, "$scfg->{pool}\/$vname";
-    my @params = ('-H', '-t', 'snapshot', '-o', 'name', $sort_params->@*, "$scfg->{pool}\/$vname");
     my $text = $class->zfs_request($scfg, undef, 'list', @params);
     my @snapshots = split(/\n/, $text);
@@ -513,9 +515,11 @@ sub volume_rollback_is_possible {
 sub volume_snapshot_info {
     my ($class, $scfg, $storeid, $volname) = @_;
+    my @params = ('-Hp', '-r', '-t', 'snapshot', '-o', 'name,guid,creation');
     my $vname = ($class->parse_volname($volname))[1];
+    push @params, "$scfg->{pool}\/$vname";
-    my @params = ('-Hp', '-t', 'snapshot', '-o', 'name,guid,creation', "$scfg->{pool}\/$vname");
     my $text = $class->zfs_request($scfg, undef, 'list', @params);
     my @lines = split(/\n/, $text);

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