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https://github.com/xemu-project/xemu.git
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b66ff2c298
There are many existing qcow2 images that specify a backing file but no format. This has been the source of CVEs in the past, but has become more prominent of a problem now that libvirt has switched to -blockdev. With older -drive, at least the probing was always done by qemu (so the only risk of a changed format between successive boots of a guest was if qemu was upgraded and probed differently). But with newer -blockdev, libvirt must specify a format; if libvirt guesses raw where the image was formatted, this results in data corruption visible to the guest; conversely, if libvirt guesses qcow2 where qemu was using raw, this can result in potential security holes, so modern libvirt instead refuses to use images without explicit backing format. The change in libvirt to reject images without explicit backing format has pointed out that a number of tools have been far too reliant on probing in the past. It's time to set a better example in our own iotests of properly setting this parameter. iotest calls to create, rebase, and convert are all impacted to some degree. It's a bit annoying that we are inconsistent on command line - while all of those accept -o backing_file=...,backing_fmt=..., the shortcuts are different: create and rebase have -b and -F, while convert has -B but no -F. (amend has no shortcuts, but the previous patch just deprecated the use of amend to change backing chains). Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20200706203954.341758-9-eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
751 lines
26 KiB
Plaintext
751 lines
26 KiB
Plaintext
QA output created by 142
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT.snap', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
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=== Simple test for all cache modes ===
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Testing: -drive file=TEST_DIR/t.qcow2,cache=none
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QEMU X.Y.Z monitor - type 'help' for more information
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(qemu) quit
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Testing: -drive file=TEST_DIR/t.qcow2,cache=directsync
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QEMU X.Y.Z monitor - type 'help' for more information
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(qemu) quit
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Testing: -drive file=TEST_DIR/t.qcow2,cache=writeback
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QEMU X.Y.Z monitor - type 'help' for more information
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(qemu) quit
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Testing: -drive file=TEST_DIR/t.qcow2,cache=writethrough
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QEMU X.Y.Z monitor - type 'help' for more information
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(qemu) quit
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Testing: -drive file=TEST_DIR/t.qcow2,cache=unsafe
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QEMU X.Y.Z monitor - type 'help' for more information
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(qemu) quit
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Testing: -drive file=TEST_DIR/t.qcow2,cache=invalid_value
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QEMU_PROG: -drive file=TEST_DIR/t.qcow2,cache=invalid_value: invalid cache option
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=== Check inheritance of cache modes ===
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--- Configure cache modes on the command line ---
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cache.direct=on on none0
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on file
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback
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cache.direct=on on backing
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on backing-file
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, direct
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cache.writeback=off on none0
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Cache mode: writethrough
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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cache.writeback=off on file
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,file.cache.writeback=off: Block protocol 'file' doesn't support the option 'cache.writeback'
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cache.writeback=off on backing
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.cache.writeback=off: Could not open backing file: Block format 'qcow2' does not support the option 'cache.writeback'
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cache.writeback=off on backing-file
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.file.cache.writeback=off: Could not open backing file: Block protocol 'file' doesn't support the option 'cache.writeback'
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cache.no-flush=on on none0
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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cache.no-flush=on on file
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, ignore flushes
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Cache mode: writeback
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Cache mode: writeback
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cache.no-flush=on on backing
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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cache.no-flush=on on backing-file
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, ignore flushes
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--- Cache modes after reopen (live snapshot) ---
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cache.direct=on on none0
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on file
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback
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cache.direct=on on backing
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on backing-file
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, direct
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cache.writeback=off on none0
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Cache mode: writethrough
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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cache.writeback=off on file
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,file.cache.writeback=off: Block protocol 'file' doesn't support the option 'cache.writeback'
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cache.writeback=off on backing
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.cache.writeback=off: Could not open backing file: Block format 'qcow2' does not support the option 'cache.writeback'
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cache.writeback=off on backing-file
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.file.cache.writeback=off: Could not open backing file: Block protocol 'file' doesn't support the option 'cache.writeback'
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cache.no-flush=on on none0
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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cache.no-flush=on on file
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, ignore flushes
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Cache mode: writeback
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Cache mode: writeback
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cache.no-flush=on on backing
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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cache.no-flush=on on backing-file
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, ignore flushes
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--- Change cache modes with reopen (qemu-io command, flags) ---
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cache.direct=on on none0
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on file
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on backing
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on backing-file
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.writeback=off on none0
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.writeback=off on file
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,file.cache.writeback=off: Block protocol 'file' doesn't support the option 'cache.writeback'
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cache.writeback=off on backing
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.cache.writeback=off: Could not open backing file: Block format 'qcow2' does not support the option 'cache.writeback'
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cache.writeback=off on backing-file
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.file.cache.writeback=off: Could not open backing file: Block protocol 'file' doesn't support the option 'cache.writeback'
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cache.no-flush=on on none0
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.no-flush=on on file
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.no-flush=on on backing
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, direct, ignore flushes
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cache.no-flush=on on backing-file
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct, ignore flushes
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--- Change cache modes with reopen (qemu-io command, options) ---
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cache.direct=on on none0
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on file
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on backing
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on backing-file
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.writeback=off on none0
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Cache mode: writethrough, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.writeback=off on file
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,file.cache.writeback=off: Block protocol 'file' doesn't support the option 'cache.writeback'
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cache.writeback=off on backing
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.cache.writeback=off: Could not open backing file: Block format 'qcow2' does not support the option 'cache.writeback'
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cache.writeback=off on backing-file
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.file.cache.writeback=off: Could not open backing file: Block protocol 'file' doesn't support the option 'cache.writeback'
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cache.no-flush=on on none0
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, direct, ignore flushes
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cache.no-flush=on on file
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.no-flush=on on backing
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, direct, ignore flushes
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cache.no-flush=on on backing-file
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct, ignore flushes
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--- Change cache modes after snapshot ---
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cache.direct=on on none0
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on file
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback
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cache.direct=on on backing
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, direct
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Cache mode: writeback, direct
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cache.direct=on on backing-file
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, direct
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cache.writeback=off on none0
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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cache.writeback=off on file
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,file.cache.writeback=off: Block protocol 'file' doesn't support the option 'cache.writeback'
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cache.writeback=off on backing
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.cache.writeback=off: Could not open backing file: Block format 'qcow2' does not support the option 'cache.writeback'
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cache.writeback=off on backing-file
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QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.file.cache.writeback=off: Could not open backing file: Block protocol 'file' doesn't support the option 'cache.writeback'
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cache.no-flush=on on none0
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Cache mode: writeback, direct
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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cache.no-flush=on on file
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback, ignore flushes
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Cache mode: writeback
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Cache mode: writeback
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cache.no-flush=on on backing
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, ignore flushes
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Cache mode: writeback, ignore flushes
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cache.no-flush=on on backing-file
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, ignore flushes
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--- Change cache mode in parent, child has explicit option in JSON ---
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, direct, ignore flushes
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Cache mode: writeback, ignore flushes
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=== Check that referenced BDSes don't inherit ===
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--- Configure cache modes on the command line ---
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cache.direct=on on blk
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback
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cache.direct=on on file
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Cache mode: writeback
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Cache mode: writeback, direct
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Cache mode: writeback
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Cache mode: writeback
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cache.direct=on on backing
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Cache mode: writeback
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Cache mode: writeback
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Cache mode: writeback, direct
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Cache mode: writeback
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cache.direct=on on backing-file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
|
|
|
|
cache.writeback=off on blk
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.writeback=off on file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.writeback=off on backing
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.writeback=off on backing-file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
|
|
cache.no-flush=on on blk
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.no-flush=on on file
|
|
Cache mode: writeback
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.no-flush=on on backing
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback
|
|
|
|
cache.no-flush=on on backing-file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, ignore flushes
|
|
|
|
--- Cache modes after reopen (live snapshot) ---
|
|
|
|
cache.direct=on on blk
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.direct=on on file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.direct=on on backing
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
|
|
cache.direct=on on backing-file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
|
|
|
|
cache.writeback=off on blk
|
|
Cache mode: writethrough
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.writeback=off on file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.writeback=off on backing
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.writeback=off on backing-file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
|
|
cache.no-flush=on on blk
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.no-flush=on on file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.no-flush=on on backing
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback
|
|
|
|
cache.no-flush=on on backing-file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, ignore flushes
|
|
|
|
--- Change cache modes with reopen (qemu-io command, flags) ---
|
|
|
|
cache.direct=on on blk
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.direct=on on file
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.direct=on on backing
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
|
|
cache.direct=on on backing-file
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
|
|
|
|
cache.writeback=off on blk
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.writeback=off on file
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.writeback=off on backing
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.writeback=off on backing-file
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
|
|
cache.no-flush=on on blk
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.no-flush=on on file
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
|
|
cache.no-flush=on on backing
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback
|
|
|
|
cache.no-flush=on on backing-file
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, ignore flushes
|
|
|
|
=== Reopening children instead of the root ===
|
|
|
|
|
|
--- Basic reopen ---
|
|
|
|
cache.direct=on on none0
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
|
|
cache.direct=on on file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
|
|
cache.direct=on on backing
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
|
|
cache.direct=on on backing-file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
|
|
|
|
cache.writeback=off on none0
|
|
Cache mode: writethrough
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
|
|
cache.writeback=off on file
|
|
QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,file.cache.writeback=off: Block protocol 'file' doesn't support the option 'cache.writeback'
|
|
|
|
cache.writeback=off on backing
|
|
QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.cache.writeback=off: Could not open backing file: Block format 'qcow2' does not support the option 'cache.writeback'
|
|
|
|
cache.writeback=off on backing-file
|
|
QEMU_PROG: -drive if=none,file=TEST_DIR/t.qcow2,backing.file.filename=TEST_DIR/t.qcow2.base,node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,backing.file.cache.writeback=off: Could not open backing file: Block protocol 'file' doesn't support the option 'cache.writeback'
|
|
|
|
|
|
cache.no-flush=on on none0
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback, direct, ignore flushes
|
|
Cache mode: writeback, direct, ignore flushes
|
|
|
|
cache.no-flush=on on file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, ignore flushes
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct
|
|
|
|
cache.no-flush=on on backing
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct, ignore flushes
|
|
Cache mode: writeback, direct, ignore flushes
|
|
|
|
cache.no-flush=on on backing-file
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, direct, ignore flushes
|
|
|
|
--- Change cache mode after reopening child ---
|
|
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback
|
|
Cache mode: writeback, direct
|
|
Cache mode: writeback, ignore flushes
|
|
*** done
|