yesBad/pve-storage
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

zfspool: add blockers parameter to volume_snapshot_is_possible

Browse Source 
useful for rollback, so that only the required replication snapshots
can be removed, and it's possible to abort early without deleting any
replication snapshots if there are other non-replication snasphots
blocking rollback.

Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
This commit is contained in:
Fabian Ebner
2021-08-12 13:01:01 +02:00
committed by Fabian Grünbichler
parent ac5c1af57c
commit 9a5d50950c
4 changed files with 24 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
PVE/Storage.pm
View File

@ -269,13 +269,13 @@ sub volume_resize {
}
sub volume_rollback_is_possible {
my ($cfg, $volid, $snap) = @_;
my ($cfg, $volid, $snap, $blockers) = @_;
my ($storeid, $volname) = parse_volume_id($volid, 1);
if ($storeid) {
my $scfg = storage_config($cfg, $storeid);
my $plugin = PVE::Storage::Plugin->lookup($scfg->{type});
return $plugin->volume_rollback_is_possible($scfg, $storeid, $volname, $snap);
return $plugin->volume_rollback_is_possible($scfg, $storeid, $volname, $snap, $blockers);
} elsif ($volid =~ m|^(/.+)$| && -e $volid) {
die "snapshot rollback file/device '$volid' is not possible\n";
} else {

2
PVE/Storage/BTRFSPlugin.pm
View File

@ -516,7 +516,7 @@ sub volume_snapshot {
}
sub volume_rollback_is_possible {
my ($class, $scfg, $storeid, $volname, $snap) = @_;
my ($class, $scfg, $storeid, $volname, $snap, $blockers) = @_;
return 1;
}

5
PVE/Storage/Plugin.pm
View File

@ -948,8 +948,11 @@ sub volume_snapshot {
return undef;
}
# Asserts that a rollback to $snap on $volname is possible.
# If certain snapshots are preventing the rollback and $blockers is an array
# reference, the snapshot names can be pushed onto $blockers prior to dying.
sub volume_rollback_is_possible {
my ($class, $scfg, $storeid, $volname, $snap) = @_;
my ($class, $scfg, $storeid, $volname, $snap, $blockers) = @_;
return 1;
}

23
PVE/Storage/ZFSPoolPlugin.pm
View File

@ -483,18 +483,29 @@ sub volume_snapshot_rollback {
}
sub volume_rollback_is_possible {
my ($class, $scfg, $storeid, $volname, $snap) = @_;
my ($class, $scfg, $storeid, $volname, $snap, $blockers) = @_;
# can't use '-S creation', because zfs list won't reverse the order when the
# creation time is the same second, breaking at least our tests.
my $snapshots = $class->zfs_get_sorted_snapshot_list($scfg, $volname, ['-s', 'creation']);
my $recentsnap = $snapshots->[-1];
die "can't rollback, no snapshots exist at all\n"
if !defined($recentsnap);
my $found;
$blockers //= []; # not guaranteed to be set by caller
for my $snapshot ($snapshots->@*) {
if ($snapshot eq $snap) {
$found = 1;
} elsif ($found) {
push $blockers->@*, $snapshot;
}
}
die "can't rollback, '$snap' is not most recent snapshot\n"
if $snap ne $recentsnap;
my $volid = "${storeid}:${volname}";
die "can't rollback, snapshot '$snap' does not exist on '$volid'\n"
if !$found;
die "can't rollback, '$snap' is not most recent snapshot on '$volid'\n"
if scalar($blockers->@*) > 0;
return 1;
}