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feat(quiesce): freeze guest filesystem during Pause for a consistent rwlayer #36

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Merged
aledbf merged 1 commit into from
Jun 15, 2026
Merged

feat(quiesce): freeze guest filesystem during Pause for a consistent rwlayer #36

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528 changes: 528 additions & 0 deletions api/next.pb.txt
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127 changes: 92 additions & 35 deletions api/services/system/v1/info.pb.go
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20 changes: 20 additions & 0 deletions api/services/system/v1/info.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,21 @@ service System {
// and commit flows can rely on a quiesced writable layer.
rpc PrepareShutdown(google.protobuf.Empty) returns (google.protobuf.Empty);

// FreezeFilesystems freezes the container's writable filesystem(s) via the
// FIFREEZE ioctl. This flushes dirty page cache to the block device and
// quiesces the on-disk filesystem so the backing rwlayer image can be read
// consistently while the VM keeps running. The host calls this from Pause
// (before suspending vCPUs); each frozen mount must later be thawed.
//
// Returns:
// - INTERNAL: an FIFREEZE ioctl failed (already-frozen mounts are skipped)
rpc FreezeFilesystems(google.protobuf.Empty) returns (FreezeFilesystemsResponse);

// ThawFilesystems thaws filesystems previously frozen by FreezeFilesystems.
// It is best-effort and idempotent: thawing a filesystem that is not frozen
// is not an error. The host calls this from Resume (after restarting vCPUs).
rpc ThawFilesystems(google.protobuf.Empty) returns (google.protobuf.Empty);

// OfflineCPU takes a CPU offline via sysfs before hot-unplug.
// The CPU must have been previously onlined and cannot be CPU 0 (boot CPU).
//
Expand Down Expand Up @@ -66,6 +81,11 @@ message InfoResponse {
string kernel_version = 2;
}

message FreezeFilesystemsResponse {
// frozen lists the mount points that were frozen by this call.
repeated string frozen = 1;
}

message OfflineCPURequest {
// cpu_id is the logical CPU ID to offline (zero-indexed, e.g., 0, 1, 2).
// This corresponds to /sys/devices/system/cpu/cpu{N}.
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32 changes: 32 additions & 0 deletions api/services/system/v1/info_ttrpc.pb.go
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4 changes: 2 additions & 2 deletions hack/install-proto-tools
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Expand Up @@ -10,5 +10,5 @@ set -eu -o pipefail
# install `protobuild` and other commands
go install github.com/containerd/protobuild@v0.3.0
go install github.com/containerd/protobuild/cmd/go-fix-acronym@v0.3.0
go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.28.1
go install github.com/containerd/ttrpc/cmd/protoc-gen-go-ttrpc@v1.2.5
go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.36.11
go install github.com/containerd/ttrpc/cmd/protoc-gen-go-ttrpc@v1.2.7
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