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a7c4202cdd
QEMU introduced "discard" option for drive since commit a9384aff53,
<...>
@var{discard} is one of "ignore" (or "off") or "unmap" (or "on") and
controls whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap})
requests are ignored or passed to the filesystem. Some machine types
may not support discard requests.
</...>
This patch exposes the support in libvirt.
QEMU supported "discard" for "-drive" since v1.5.0-rc0:
% git tag --contains a9384aff53
contains
v1.5.0-rc0
v1.5.0-rc1
So this only detects the capability bit using virQEMUCapsProbeQMPCommandLine.
9 lines
610 B
Plaintext
9 lines
610 B
Plaintext
LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test \
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/usr/bin/qemu -S -M pc-0.13 -m 1024 -smp 1 -nographic -nodefaults \
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-monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot dc -usb \
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-drive file=/var/lib/libvirt/images/f14.img,if=none,id=drive-virtio-disk0,discard=on \
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-device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 \
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-drive file=/var/lib/libvirt/Fedora-14-x86_64-Live-KDE.iso,if=none,media=cdrom,id=drive-ide0-1-0,discard=off \
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-device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 \
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-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
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