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From: Wolfgang Bumiller <w.bumiller@proxmox.com>
To: pve-devel@lists.proxmox.com
Date: Thu, 24 Jun 2021 16:58:33 +0200
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Subject: [pve-devel] [PATCH qemu-server] don't default to O_DIRECT on btrfs
without nocow
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otherwise it'll produce a whole lot of checksum errors
and while this would be nice as a storage feature check,
it's hard to be 100% accurate there anyway since a directory
storage can point anywhere, like for instance a btrfs
directory, causing the same issue...
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
---
PVE/QemuServer.pm | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 25282b7..8af4176 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -1530,14 +1530,15 @@ sub print_drive_commandline_full {
my $format = $drive->{format};
my $drive_id = get_drive_id($drive);
+ my ($storeid, $volname) = PVE::Storage::parse_volume_id($volid, 1);
+ my $scfg = $storeid ? PVE::Storage::storage_config($storecfg, $storeid) : undef;
+
if (drive_is_cdrom($drive)) {
$path = get_iso_path($storecfg, $vmid, $volid);
die "$drive_id: cannot back cdrom drive with PBS snapshot\n" if $pbs_name;
} else {
- my ($storeid, $volname) = PVE::Storage::parse_volume_id($volid, 1);
if ($storeid) {
$path = PVE::Storage::path($storecfg, $volid);
- my $scfg = PVE::Storage::storage_config($storecfg, $storeid);
$format //= qemu_img_format($scfg, $volname);
} else {
$path = $volid;
@@ -1594,7 +1595,7 @@ sub print_drive_commandline_full {
if (my $cache = $drive->{cache}) {
$cache_direct = $cache =~ /^(?:off|none|directsync)$/;
- } elsif (!drive_is_cdrom($drive)) {
+ } elsif (!drive_is_cdrom($drive) && !($scfg && $scfg->{type} eq 'btrfs' && !$scfg->{nocow})) {
$opts .= ",cache=none";
$cache_direct = 1;
}
--
2.30.2