virtio-blk: blockdev-mirroring for live storage migration - #175

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Coffeeri wants to merge 36 commits into

cyberus-technology:gardenlinuxfrom

Coffeeri:blockdev-mirror-cyberus-synchronous-completions

Commits on Aug 12, 2026

block: add mirror module skeleton
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edcea69

Commits on Aug 14, 2026

block: add MirroringAsyncIo skeleton
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a465173
block: add range lock primitive for mirror
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10537da
block: add CompletionIo for single-fd waits
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80b6c30
block: mirror mutating I/O to destination
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930bee7
block: add background copy worker for mirror
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6993515
virtio-devices: swap disk_image via queue commands
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4ae7d5a
virtio-devices: set up mirror command channels
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a1031cb

Commits on Aug 17, 2026

virtio-devices, block: add Block::start_mirror
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ef9d939
vmm: add device manager block mirror start and status
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666b7b9
vmm: add vm.disk-mirror-start REST endpoint
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19eb5be
vmm: add vm.disk-mirror-status REST endpoint
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cafe346
block: implement MirroringAsyncIo::submit_batch_requests
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a8cf5df
virtio-devices, block: add Block::complete_mirror
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dd72917
vmm: add vm.disk-mirror-complete REST endpoint
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3e99823
virtio-devices, block: add Block::cancel_mirror
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c2665e3
vmm: deny conflicting ops while a disk mirror runs
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8a96e9b
block: use source passthrough after mirror failure
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eeb1953
vmm: add vm.disk-mirror-cancel REST endpoint
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b8481ad
block: preserve sparseness in CopyWorker
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43d9e70
block: add mirror unit tests
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4f56164
block: test range guard held across mirror write
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3429600
virtio-devices, block: reject mirror ops on a paused device
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860e398
vmm: reject mirror destination already backing a disk
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a5d9519
block: test batched submit on partial failure
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62f61b7
block: test mirror phase transitions and op fan-out
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ebd9372
docs: add disk mirroring guide
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a088046
vmm: dedup block device lookup in DeviceManager
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5ccc370
virtio-devices: generalize lock granularity
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700aba0
virtio-devices: generalize disk locking
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86c5022
virtio-devices, vmm: lock mirror destination
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db03820
block: release stale QEMU lock after downgrade
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7dabb3f
block: reject QCOW2 backing chains for mirroring
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d153397
vmm: generalize postponed lifecycle events
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f91d9f7
vmm: postpone guest lifecycle for disk mirrors
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9e457c6
virtio-devices, block: emit disk mirror events
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ded51be