fixes #2991, #2528. creating a snapshot with rbd, after the syncfs finished successfully does not guarantee that the snapshot has the state of the filesystem after syncfs.
suggestion taken from #2528 (running fsfreeze -f/-u before snapshotting on the mountpoints) added helper PVE::Storage::volume_snapshot_needs_fsfreeze, to indicate which volumes need to be frozen/thawed. (and mocked it in the tests here). Added to sync_container_namespace, since fsfreeze needs to run inside the container's mount namespace. tests in #2991 seem to indicate that this helps to successfully create backups. needs a versioned dependency bump on pve-common and pve-storage Signed-off-by: Stoiko Ivanov <s.iva...@proxmox.com> --- src/PVE/LXC.pm | 21 +++++++++++++++++---- src/PVE/LXC/Config.pm | 15 ++++++++++++++- src/test/snapshot-test.pm | 12 +++++++++++- 3 files changed, 42 insertions(+), 6 deletions(-) diff --git a/src/PVE/LXC.pm b/src/PVE/LXC.pm index 9c150d9..6f87c96 100644 --- a/src/PVE/LXC.pm +++ b/src/PVE/LXC.pm @@ -1091,7 +1091,7 @@ my $get_container_namespace = sub { }; my $do_syncfs = sub { - my ($vmid, $pid, $socket) = @_; + my ($vmid, $pid, $socket, $freeze_mountpoints, $thaw) = @_; &$enter_namespace($vmid, $pid, 'mnt', PVE::Tools::CLONE_NEWNS); @@ -1121,13 +1121,26 @@ my $do_syncfs = sub { foreach my $mp (@$mounts) { my ($what, $dir, $fs) = @$mp; next if $nosyncfs{$fs}; - eval { PVE::Tools::sync_mountpoint($dir); }; + eval { + + PVE::Tools::sync_mountpoint($dir) if !$thaw; + }; + + warn $@ if $@; + } + + # freeze/unfreeze the mountpoint which need it + foreach my $dir (@$freeze_mountpoints) { + + eval { + PVE::Tools::fsfreeze_mountpoint($dir, $thaw); + }; warn $@ if $@; } }; sub sync_container_namespace { - my ($vmid) = @_; + my ($vmid, $freeze_mountpoints, $thaw) = @_; my $pid = find_lxc_pid($vmid); # SOCK_DGRAM is nicer for barriers but cannot be slurped @@ -1140,7 +1153,7 @@ sub sync_container_namespace { if (!$child) { eval { close $pfd; - &$do_syncfs($vmid, $pid, $cfd); + &$do_syncfs($vmid, $pid, $cfd, $freeze_mountpoints, $thaw); }; if (my $err = $@) { warn $err; diff --git a/src/PVE/LXC/Config.pm b/src/PVE/LXC/Config.pm index 49f599b..f7b763b 100644 --- a/src/PVE/LXC/Config.pm +++ b/src/PVE/LXC/Config.pm @@ -112,12 +112,25 @@ sub __snapshot_check_freeze_needed { sub __snapshot_freeze { my ($class, $vmid, $unfreeze) = @_; + my $conf = $class->load_config($vmid); + my $storagecfg = PVE::Storage::config(); + + my $freeze_mps = []; + $class->foreach_volume($conf, sub { + my ($ms, $mountpoint) = @_; + + if (PVE::Storage::volume_snapshot_needs_fsfreeze($storagecfg, $mountpoint->{volume})) { + push @$freeze_mps, $mountpoint->{mp}; + } + }); + if ($unfreeze) { eval { PVE::LXC::thaw($vmid); }; warn $@ if $@; + PVE::LXC::sync_container_namespace($vmid, $freeze_mps, 1); } else { PVE::LXC::freeze($vmid); - PVE::LXC::sync_container_namespace($vmid); + PVE::LXC::sync_container_namespace($vmid, $freeze_mps, 0); } } diff --git a/src/test/snapshot-test.pm b/src/test/snapshot-test.pm index bfb8551..91a2af9 100644 --- a/src/test/snapshot-test.pm +++ b/src/test/snapshot-test.pm @@ -113,6 +113,15 @@ sub mocked_volume_rollback_is_possible { die "volume_rollback_is_possible failed\n"; } +sub mocked_volume_snapshot_needs_fsfreeze { + my ($storecfg, $volid) = @_; + die "Storage config not mocked! aborting\n" + if defined($storecfg); + die "volid undefined\n" + if !defined($volid); + return 0; +} + sub mocked_vm_stop { if ($kill_possible) { $running = 0; @@ -386,7 +395,8 @@ $storage_module->mock('volume_snapshot', \&mocked_volume_snapshot); $storage_module->mock('volume_snapshot_delete', \&mocked_volume_snapshot_delete); $storage_module->mock('volume_snapshot_rollback', \&mocked_volume_snapshot_rollback); $storage_module->mock('volume_rollback_is_possible', \&mocked_volume_rollback_is_possible); -printf("\tconfig(), volume_snapshot(), volume_snapshot_delete(), volume_snapshot_rollback() and volume_rollback_is_possible() mocked\n"); +$storage_module->mock('volume_snapshot_needs_fsfreeze', \&mocked_volume_snapshot_needs_fsfreeze); +printf("\tconfig(), volume_snapshot(), volume_snapshot_delete(), volume_snapshot_rollback(), volume_rollback_is_possible() and volume_snapshot_needs_fsfreeze() mocked\n"); printf("\n"); printf("Setting up Mocking for PVE::Tools\n"); -- 2.20.1 _______________________________________________ pve-devel mailing list pve-devel@lists.proxmox.com https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel