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feat: Phase 4A CP1 — epoch, lease, role state machine, write gate
feat: Phase 4A CP1 — epoch, lease, role state machine, write gate
Local fencing primitives for block volumes. Every write path validates role + epoch + lease before accepting data. RoleNone (default) skips all checks for Phase 3 backward compatibility. New files: epoch.go, lease.go, role.go, write_gate.go Modified: superblock.go (Epoch field), blockvol.go (fencing fields, writeGate in WriteLBA/Trim), group_commit.go (PostSyncCheck/Gotcha A), dirty_map.go (P3-BUG-9 power-of-2 panic) Bug fixes: BUG-4A-1 (atomic epoch), BUG-4A-2 (CAS SetRole), BUG-4A-3 (mutex SetEpoch), BUG-4A-4 (single role.Load), BUG-4A-6 (safeCallback recover) 837 tests (557 engine + 280 iSCSI), all passing. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>feature/sw-block
Ping Qiu
3 weeks ago
11 changed files with 1903 additions and 49 deletions
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40weed/storage/blockvol/blockvol.go
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434weed/storage/blockvol/blockvol_test.go
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3weed/storage/blockvol/dirty_map.go
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38weed/storage/blockvol/epoch.go
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42weed/storage/blockvol/group_commit.go
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31weed/storage/blockvol/lease.go
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27weed/storage/blockvol/qa_phase3_engine_test.go
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1198weed/storage/blockvol/qa_phase4a_cp1_test.go
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104weed/storage/blockvol/role.go
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7weed/storage/blockvol/superblock.go
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28weed/storage/blockvol/write_gate.go
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package blockvol |
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import ( |
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"fmt" |
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"os" |
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) |
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// Epoch returns the current epoch of this volume.
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func (v *BlockVol) Epoch() uint64 { |
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return v.epoch.Load() |
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} |
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// SetEpoch persists a new epoch to the superblock and fsyncs.
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// Must be durable before writes are accepted at the new epoch.
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func (v *BlockVol) SetEpoch(epoch uint64) error { |
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v.mu.Lock() |
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defer v.mu.Unlock() |
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v.super.Epoch = epoch |
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v.epoch.Store(epoch) |
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if _, err := v.fd.Seek(0, os.SEEK_SET); err != nil { |
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return fmt.Errorf("blockvol: seek superblock: %w", err) |
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} |
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if _, err := v.super.WriteTo(v.fd); err != nil { |
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return fmt.Errorf("blockvol: write superblock: %w", err) |
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} |
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if err := v.fd.Sync(); err != nil { |
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return fmt.Errorf("blockvol: sync superblock: %w", err) |
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} |
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return nil |
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} |
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// SetMasterEpoch sets the expected epoch from the master.
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// Writes are rejected if v.epoch != v.masterEpoch (when role != RoleNone).
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func (v *BlockVol) SetMasterEpoch(epoch uint64) { |
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v.masterEpoch.Store(epoch) |
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} |
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@ -0,0 +1,31 @@ |
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package blockvol |
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import ( |
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"sync/atomic" |
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"time" |
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) |
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// Lease tracks a runtime-only lease expiry for write fencing.
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// Zero-value is an expired (invalid) lease. Not persisted.
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type Lease struct { |
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expiry atomic.Value // stores time.Time
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} |
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// Grant sets the lease to expire after ttl from now.
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func (l *Lease) Grant(ttl time.Duration) { |
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l.expiry.Store(time.Now().Add(ttl)) |
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} |
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// IsValid returns true if the lease has not expired.
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func (l *Lease) IsValid() bool { |
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v := l.expiry.Load() |
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if v == nil { |
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return false |
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} |
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return time.Now().Before(v.(time.Time)) |
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} |
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// Revoke immediately invalidates the lease.
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func (l *Lease) Revoke() { |
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l.expiry.Store(time.Time{}) // zero time is always in the past
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} |
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1198
weed/storage/blockvol/qa_phase4a_cp1_test.go
File diff suppressed because it is too large
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File diff suppressed because it is too large
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package blockvol |
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import ( |
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"errors" |
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"fmt" |
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) |
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// Role represents the replication role of a block volume.
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type Role uint8 |
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const ( |
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RoleNone Role = 0 // Phase 3 default, no fencing
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RolePrimary Role = 1 |
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RoleReplica Role = 2 |
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RoleStale Role = 3 |
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RoleRebuilding Role = 4 |
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RoleDraining Role = 5 |
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) |
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// String returns the role name.
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func (r Role) String() string { |
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switch r { |
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case RoleNone: |
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return "none" |
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case RolePrimary: |
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return "primary" |
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case RoleReplica: |
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return "replica" |
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case RoleStale: |
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return "stale" |
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case RoleRebuilding: |
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return "rebuilding" |
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case RoleDraining: |
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return "draining" |
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default: |
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return fmt.Sprintf("unknown(%d)", uint8(r)) |
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} |
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} |
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// validTransitions maps each role to the set of roles it can transition to.
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var validTransitions = map[Role]map[Role]bool{ |
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RoleNone: {RolePrimary: true, RoleReplica: true}, |
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RolePrimary: {RoleDraining: true}, |
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RoleReplica: {RolePrimary: true}, |
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RoleStale: {RoleRebuilding: true, RoleReplica: true}, |
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RoleRebuilding: {RoleReplica: true}, |
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RoleDraining: {RoleStale: true}, |
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} |
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// ValidTransition returns true if transitioning from -> to is allowed.
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func ValidTransition(from, to Role) bool { |
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targets, ok := validTransitions[from] |
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if !ok { |
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return false |
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} |
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return targets[to] |
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} |
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// RoleChangeCallback is called when a volume's role changes.
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type RoleChangeCallback func(old, new Role) |
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var ErrInvalidRoleTransition = errors.New("blockvol: invalid role transition") |
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// Role returns the current role of this volume.
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func (v *BlockVol) Role() Role { |
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return Role(v.role.Load()) |
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} |
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// SetRole transitions the volume to a new role if the transition is valid.
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// Uses CompareAndSwap to prevent TOCTOU races between concurrent callers.
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// Calls the registered RoleChangeCallback after updating.
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func (v *BlockVol) SetRole(r Role) error { |
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for { |
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old := v.role.Load() |
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if !ValidTransition(Role(old), r) { |
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return fmt.Errorf("%w: %s -> %s", ErrInvalidRoleTransition, Role(old), r) |
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} |
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if v.role.CompareAndSwap(old, uint32(r)) { |
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if v.roleCallback != nil { |
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v.safeCallback(Role(old), r) |
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} |
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return nil |
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} |
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// CAS failed — another goroutine changed the role; retry.
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} |
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} |
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// safeCallback invokes the role callback with panic recovery.
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// If the callback panics, the role is already updated but the panic
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// is caught and returned as an error via log (callers see nil from SetRole).
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func (v *BlockVol) safeCallback(old, new Role) { |
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defer func() { |
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if r := recover(); r != nil { |
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// Role is already stored. Log but don't propagate panic.
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// In production, this would go to glog. For now, swallow it.
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} |
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}() |
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v.roleCallback(old, new) |
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} |
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// SetRoleCallback registers a callback to be invoked on role changes.
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func (v *BlockVol) SetRoleCallback(cb RoleChangeCallback) { |
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v.roleCallback = cb |
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} |
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@ -0,0 +1,28 @@ |
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package blockvol |
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import "errors" |
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var ( |
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ErrNotPrimary = errors.New("blockvol: not primary") |
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ErrEpochStale = errors.New("blockvol: epoch stale") |
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ErrLeaseExpired = errors.New("blockvol: lease expired") |
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) |
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// writeGate checks role, epoch, and lease before allowing a write.
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// RoleNone skips all checks for Phase 3 backward compatibility.
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func (v *BlockVol) writeGate() error { |
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r := Role(v.role.Load()) |
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if r == RoleNone { |
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return nil // Phase 3 compat: no fencing
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} |
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if r != RolePrimary { |
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return ErrNotPrimary |
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} |
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if v.epoch.Load() != v.masterEpoch.Load() { |
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return ErrEpochStale |
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} |
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if !v.lease.IsValid() { |
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return ErrLeaseExpired |
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} |
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return nil |
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} |
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