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ZFS: refactor waiting for zvol symlinks

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and actually do that not just for creating zvols, but also when
activating them. this should fix a range of issues/races that sometimes
occured on bootup, snapshot rollback or similar operations.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
This commit is contained in:
Fabian Grünbichler
2019-07-31 10:58:04 +02:00
committed by Wolfgang Bumiller
parent be78543909
commit 56362cfb55
2 changed files with 46 additions and 14 deletions
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36
PVE/Storage/ZFSPoolPlugin.pm
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@ -189,6 +189,23 @@ sub zfs_request {
return $msg;
}
sub zfs_wait_for_zvol_link {
my ($class, $scfg, $volname, $timeout) = @_;
my $default_timeout = PVE::RPCEnvironment->is_worker() ? 60*5 : 10;
$timeout = $default_timeout if !defined($timeout);
my ($devname, undef, undef) = $class->path($scfg, $volname);
for (my $i = 1; $i <= $timeout; $i++) {
last if -b $devname;
die "timeout: no zvol device link for '$volname' found after $timeout sec found.\n"
if $i == $timeout;
sleep(1);
}
}
sub alloc_image {
my ($class, $storeid, $scfg, $vmid, $fmt, $name, $size) = @_;
@ -202,16 +219,8 @@ sub alloc_image {
if !$volname;
$class->zfs_create_zvol($scfg, $volname, $size);
my $devname = "/dev/zvol/$scfg->{pool}/$volname";
$class->zfs_wait_for_zvol_link($scfg, $volname);
my $timeout = PVE::RPCEnvironment->is_worker() ? 60*5 : 10;
for (my $i = 1; $i <= $timeout; $i++) {
last if -b $devname;
die "Timeout: no zvol after $timeout sec found.\n"
if $i == $timeout;
sleep(1);
}
} elsif ( $fmt eq 'subvol') {
die "illegal name '$volname' - should be 'subvol-$vmid-*'\n"
@ -545,6 +554,15 @@ sub deactivate_storage {
sub activate_volume {
my ($class, $storeid, $scfg, $volname, $snapname, $cache) = @_;
return 1 if defined($snapname);
my (undef, undef, undef, undef, undef, undef, $format) = $class->parse_volname($volname);
return 1 if $format ne 'raw';
$class->zfs_wait_for_zvol_link($scfg, $volname);
return 1;
}