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fix: buffered disk cache so btrfs checksums stay valid

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Sandwich
2026-09-06 05:39:31 +02:00
parent 52b18427f2
commit 91fd1c45e1
1 changed files with 4 additions and 1 deletions
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5
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]