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fix: buffered disk cache so btrfs checksums stay valid

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Sandwich
2026-09-06 05:04:12 +02:00
parent 52b18427f2
commit 6473a33b2c
1 changed files with 5 additions and 2 deletions
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7
scripts/setup-vm.sh
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@@ -637,8 +637,11 @@ if conformant and E["CONVERT"] == "1":
if "device='disk'" not in d or ("bus='nvme'" in d and "<serial>" in d):
return d
d = re.sub(r"<target dev='([^']*)' bus='(virtio|sata|scsi)'/>", r"<target dev='\1' bus='nvme'/>", d)
# cache='none' is O_DIRECT: on btrfs the guest can change a page while the
# write is in flight, so the stored checksum never matches and later reads
# fail with EIO. Buffered writes hand the filesystem a stable page.
d = re.sub(r"<driver name='qemu' type='([^']*)'[^/]*/>",
r"<driver name='qemu' type='\1' cache='none' io='native' discard='unmap'/>", d)
r"<driver name='qemu' type='\1' cache='writeback' io='threads' discard='unmap'/>", d)
d = re.sub(r"\s*<address type='(pci|drive)'[^/]*/>", "", d)
if "<serial>" not in d:
serial = E["NVME_SERIAL"] if n[0] == 0 else E["NVME_SERIAL"][:-1] + "0123456789ABCDEF"[n[0] % 16]
@@ -824,7 +827,7 @@ if [ "$PROFILE" = full ]; then
fi
if [ ! -e /usr/lib/udev/rules.d/99-vfio-native-vnet-offload.rules ] && [ ! -e /etc/udev/rules.d/99-vfio-native-vnet-offload.rules ]; then
echo "NOTE: the e1000e offload udev rule is not installed. SSH into the guest will fail with"
echo "NOTE: the NIC offload udev rule is not installed. SSH into the guest will fail with"
echo " 'Corrupted MAC on input' until it is:"
echo " sudo install -Dm644 $SELF/scripts/99-vfio-native-vnet-offload.rules /etc/udev/rules.d/ && sudo udevadm control --reload-rules"
fi