build/openrpc/miner.json

@@ -9711,6 +9711,7 @@
                                         0,
                                         1,
                                         0,
+                                        0,
                                         0
                                     ],
                                     "Read": [
@@ -9718,6 +9719,7 @@
                                         3,
                                         0,
                                         0,
+                                        0,
                                         0
                                     ]
                                 }
@@ -9736,8 +9738,8 @@
                                             "title": "number",
                                             "type": "number"
                                         },
-                                        "maxItems": 5,
+                                        "maxItems": 6,
-                                        "minItems": 5,
+                                        "minItems": 6,
                                         "type": "array"
                                     },
                                     "Sector": {
@@ -9760,8 +9762,8 @@
                                             "title": "number",
                                             "type": "number"
                                         },
-                                        "maxItems": 5,
+                                        "maxItems": 6,
-                                        "minItems": 5,
+                                        "minItems": 6,
                                         "type": "array"
                                     }
                                 },

cmd/curio/tasks/tasks.go

@@ -13,9 +13,12 @@ import (
 	"github.com/filecoin-project/lotus/curiosrc/chainsched"
 	"github.com/filecoin-project/lotus/curiosrc/ffi"
 	"github.com/filecoin-project/lotus/curiosrc/message"
+	"github.com/filecoin-project/lotus/curiosrc/piece"
 	"github.com/filecoin-project/lotus/curiosrc/seal"
 	"github.com/filecoin-project/lotus/curiosrc/winning"
 	"github.com/filecoin-project/lotus/lib/harmony/harmonytask"
+	"github.com/filecoin-project/lotus/lib/lazy"
+	"github.com/filecoin-project/lotus/lib/must"
 	"github.com/filecoin-project/lotus/node/modules"
 )
 
@@ -66,6 +69,19 @@ func StartTasks(ctx context.Context, dependencies *deps.Deps) (*harmonytask.Task
 		}
 	}
 
+	slrLazy := lazy.MakeLazy(func() (*ffi.SealCalls, error) {
+		return ffi.NewSealCalls(stor, lstor, si), nil
+	})
+
+	{
+		// Piece handling
+		if cfg.Subsystems.EnableParkPiece {
+			parkPieceTask := piece.NewParkPieceTask(db, must.One(slrLazy.Val()), cfg.Subsystems.ParkPieceMaxTasks)
+			cleanupPieceTask := piece.NewCleanupPieceTask(db, must.One(slrLazy.Val()), 0)
+			activeTasks = append(activeTasks, parkPieceTask, cleanupPieceTask)
+		}
+	}
+
 	hasAnySealingTask := cfg.Subsystems.EnableSealSDR ||
 		cfg.Subsystems.EnableSealSDRTrees ||
 		cfg.Subsystems.EnableSendPrecommitMsg ||
@@ -81,7 +97,7 @@ func StartTasks(ctx context.Context, dependencies *deps.Deps) (*harmonytask.Task
 			sp = seal.NewPoller(db, full)
 			go sp.RunPoller(ctx)
 
-			slr = ffi.NewSealCalls(stor, lstor, si)
+			slr = must.One(slrLazy.Val())
 		}
 
 		// NOTE: Tasks with the LEAST priority are at the top

cmd/lotus-shed/deal.go

@@ -14,7 +14,8 @@ import (
 	"time"
 
 	"github.com/fatih/color"
-	"github.com/ipfs/go-cid"
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5"
 	"github.com/mitchellh/go-homedir"
 	manet "github.com/multiformats/go-multiaddr/net"
 	"github.com/urfave/cli/v2"
@@ -37,6 +38,7 @@ import (
 	"github.com/filecoin-project/lotus/cmd/curio/deps"
 	cumarket "github.com/filecoin-project/lotus/curiosrc/market"
 	"github.com/filecoin-project/lotus/curiosrc/market/fakelm"
+	"github.com/filecoin-project/lotus/lib/harmony/harmonydb"
 	"github.com/filecoin-project/lotus/lib/must"
 	"github.com/filecoin-project/lotus/lib/nullreader"
 	"github.com/filecoin-project/lotus/metrics/proxy"
@@ -427,7 +429,7 @@ var lpBoostProxyCmd = &cli.Command{
 		}
 
 		pieceInfoLk := new(sync.Mutex)
-		pieceInfos := map[cid.Cid][]pieceInfo{}
+		pieceInfos := map[uuid.UUID][]pieceInfo{}
 
 		ast.Internal.SectorAddPieceToAny = func(ctx context.Context, pieceSize abi.UnpaddedPieceSize, pieceData storiface.Data, deal api.PieceDealInfo) (api.SectorOffset, error) {
 			origPieceData := pieceData
@@ -449,25 +451,103 @@ var lpBoostProxyCmd = &cli.Command{
 				done: make(chan struct{}),
 			}
 
+			pieceUUID := uuid.New()
+
+			color.Blue("%s %s piece assign request with id %s", deal.DealProposal.PieceCID, deal.DealProposal.Provider, pieceUUID)
+
 			pieceInfoLk.Lock()
-			pieceInfos[deal.DealProposal.PieceCID] = append(pieceInfos[deal.DealProposal.PieceCID], pi)
+			pieceInfos[pieceUUID] = append(pieceInfos[pieceUUID], pi)
 			pieceInfoLk.Unlock()
 
 			// /piece?piece_cid=xxxx
 			dataUrl := rootUrl
 			dataUrl.Path = "/piece"
-			dataUrl.RawQuery = "piece_cid=" + deal.DealProposal.PieceCID.String()
+			dataUrl.RawQuery = "piece_id=" + pieceUUID.String()
+
+			// add piece entry
+
+			var refID int64
+			var pieceWasCreated bool
+
+			comm, err := db.BeginTransaction(ctx, func(tx *harmonydb.Tx) (commit bool, err error) {
+				var pieceID int64
+				// Attempt to select the piece ID first
+				err = tx.QueryRow(`SELECT id FROM parked_pieces WHERE piece_cid = $1`, deal.DealProposal.PieceCID.String()).Scan(&pieceID)
+
+				if err != nil {
+					if err == pgx.ErrNoRows {
+						// Piece does not exist, attempt to insert
+						err = tx.QueryRow(`
+							INSERT INTO parked_pieces (piece_cid, piece_padded_size, piece_raw_size)
+							VALUES ($1, $2, $3)
+							ON CONFLICT (piece_cid) DO NOTHING
+							RETURNING id`, deal.DealProposal.PieceCID.String(), int64(pieceSize.Padded()), int64(pieceSize)).Scan(&pieceID)
+						if err != nil {
+							return false, xerrors.Errorf("inserting new parked piece and getting id: %w", err)
+						}
+						pieceWasCreated = true // New piece was created
+					} else {
+						// Some other error occurred during select
+						return false, xerrors.Errorf("checking existing parked piece: %w", err)
+					}
+				} else {
+					pieceWasCreated = false // Piece already exists, no new piece was created
+				}
+
+				// Add parked_piece_ref
+				err = tx.QueryRow(`INSERT INTO parked_piece_refs (piece_id, data_url)
+        			VALUES ($1, $2) RETURNING ref_id`, pieceID, dataUrl.String()).Scan(&refID)
+				if err != nil {
+					return false, xerrors.Errorf("inserting parked piece ref: %w", err)
+				}
+
+				// If everything went well, commit the transaction
+				return true, nil // This will commit the transaction
+			}, harmonydb.OptionRetry())
+			if err != nil {
+				return api.SectorOffset{}, xerrors.Errorf("inserting parked piece: %w", err)
+			}
+			if !comm {
+				return api.SectorOffset{}, xerrors.Errorf("piece tx didn't commit")
+			}
+
+			// wait for piece to be parked
+			if pieceWasCreated {
+				<-pi.done
+			} else {
+				// If the piece was not created, we need to close the done channel
+				close(pi.done)
+
+				go func() {
+					// close the data reader (drain to eof if it's not a closer)
+					if closer, ok := pieceData.(io.Closer); ok {
+						if err := closer.Close(); err != nil {
+							log.Warnw("closing pieceData in DataCid", "error", err)
+						}
+					} else {
+						log.Warnw("pieceData is not an io.Closer", "type", fmt.Sprintf("%T", pieceData))
+
+						_, err := io.Copy(io.Discard, pieceData)
+						if err != nil {
+							log.Warnw("draining pieceData in DataCid", "error", err)
+						}
+					}
+				}()
+			}
+
+			pieceIDUrl := url.URL{
+				Scheme: "pieceref",
+				Opaque: fmt.Sprintf("%d", refID),
+			}
 
 			// make a sector
-			so, err := pin.AllocatePieceToSector(ctx, maddr, deal, int64(pieceSize), dataUrl, nil)
+			so, err := pin.AllocatePieceToSector(ctx, maddr, deal, int64(pieceSize), pieceIDUrl, nil)
 			if err != nil {
 				return api.SectorOffset{}, err
 			}
 
 			color.Blue("%s piece assigned to sector f0%d:%d @ %d", deal.DealProposal.PieceCID, mid, so.Sector, so.Offset)
 
-			<-pi.done
-
 			return so, nil
 		}
 
@@ -484,10 +564,12 @@ var lpBoostProxyCmd = &cli.Command{
 		ast.Internal.StorageGetLocks = si.StorageGetLocks
 
 		var pieceHandler http.HandlerFunc = func(w http.ResponseWriter, r *http.Request) {
-			// /piece?piece_cid=xxxx
+			// /piece?piece_id=xxxx
-			pieceCid, err := cid.Decode(r.URL.Query().Get("piece_cid"))
+			pieceUUID := r.URL.Query().Get("piece_id")
+
+			pu, err := uuid.Parse(pieceUUID)
 			if err != nil {
-				http.Error(w, "bad piece_cid", http.StatusBadRequest)
+				http.Error(w, "bad piece id", http.StatusBadRequest)
 				return
 			}
 
@@ -496,13 +578,13 @@ var lpBoostProxyCmd = &cli.Command{
 				return
 			}
 
-			fmt.Printf("%s request for piece from %s\n", pieceCid, r.RemoteAddr)
+			fmt.Printf("%s request for piece from %s\n", pieceUUID, r.RemoteAddr)
 
 			pieceInfoLk.Lock()
-			pis, ok := pieceInfos[pieceCid]
+			pis, ok := pieceInfos[pu]
 			if !ok {
 				http.Error(w, "piece not found", http.StatusNotFound)
-				color.Red("%s not found", pieceCid)
+				color.Red("%s not found", pu)
 				pieceInfoLk.Unlock()
 				return
 			}
@@ -511,7 +593,10 @@ var lpBoostProxyCmd = &cli.Command{
 			pi := pis[0]
 			pis = pis[1:]
 
-			pieceInfos[pieceCid] = pis
+			pieceInfos[pu] = pis
+			if len(pis) == 0 {
+				delete(pieceInfos, pu)
+			}
 
 			pieceInfoLk.Unlock()
 
@@ -533,7 +618,7 @@ var lpBoostProxyCmd = &cli.Command{
 				return
 			}
 
-			color.Green("%s served %.3f MiB in %s (%.2f MiB/s)", pieceCid, float64(n)/(1024*1024), took, mbps)
+			color.Green("%s served %.3f MiB in %s (%.2f MiB/s)", pu, float64(n)/(1024*1024), took, mbps)
 		}
 
 		finalApi := proxy.LoggingAPI[api.StorageMiner, api.StorageMinerStruct](&ast)

curiosrc/ffi/piece_funcs.go

@@ -0,0 +1,75 @@
+package ffi
+
+import (
+	"context"
+	"io"
+	"os"
+	"time"
+
+	"golang.org/x/xerrors"
+
+	"github.com/filecoin-project/lotus/storage/sealer/storiface"
+)
+
+func (sb *SealCalls) WritePiece(ctx context.Context, pieceID storiface.PieceNumber, size int64, data io.Reader) error {
+	// todo: config(?): allow setting PathStorage for this
+	// todo storage reservations
+	paths, done, err := sb.sectors.AcquireSector(ctx, nil, pieceID.Ref(), storiface.FTNone, storiface.FTPiece, storiface.PathSealing)
+	if err != nil {
+		return err
+	}
+	defer done()
+
+	dest := paths.Piece
+	tempDest := dest + ".tmp"
+
+	destFile, err := os.OpenFile(tempDest, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+	if err != nil {
+		return xerrors.Errorf("creating temp piece file '%s': %w", tempDest, err)
+	}
+
+	removeTemp := true
+	defer func() {
+		if removeTemp {
+			rerr := os.Remove(tempDest)
+			if rerr != nil {
+				log.Errorf("removing temp file: %+v", rerr)
+			}
+		}
+	}()
+
+	copyStart := time.Now()
+
+	n, err := io.CopyBuffer(destFile, io.LimitReader(data, size), make([]byte, 8<<20))
+	if err != nil {
+		_ = destFile.Close()
+		return xerrors.Errorf("copying piece data: %w", err)
+	}
+
+	if err := destFile.Close(); err != nil {
+		return xerrors.Errorf("closing temp piece file: %w", err)
+	}
+
+	if n != size {
+		return xerrors.Errorf("short write: %d", n)
+	}
+
+	copyEnd := time.Now()
+
+	log.Infow("wrote parked piece", "piece", pieceID, "size", size, "duration", copyEnd.Sub(copyStart), "dest", dest, "MiB/s", float64(size)/(1<<20)/copyEnd.Sub(copyStart).Seconds())
+
+	if err := os.Rename(tempDest, dest); err != nil {
+		return xerrors.Errorf("rename temp piece to dest %s -> %s: %w", tempDest, dest, err)
+	}
+
+	removeTemp = false
+	return nil
+}
+
+func (sb *SealCalls) PieceReader(ctx context.Context, id storiface.PieceNumber) (io.ReadCloser, error) {
+	return sb.sectors.storage.ReaderSeq(ctx, id.Ref(), storiface.FTPiece)
+}
+
+func (sb *SealCalls) RemovePiece(ctx context.Context, id storiface.PieceNumber) error {
+	return sb.sectors.storage.Remove(ctx, id.Ref().ID, storiface.FTPiece, true, nil)
+}

curiosrc/ffi/sdr_funcs.go

@@ -42,7 +42,7 @@ type SealCalls struct {
 	externCalls ExternalSealer*/
 }
 
-func NewSealCalls(st paths.Store, ls *paths.Local, si paths.SectorIndex) *SealCalls {
+func NewSealCalls(st *paths.Remote, ls *paths.Local, si paths.SectorIndex) *SealCalls {
 	return &SealCalls{
 		sectors: &storageProvider{
 			storage:             st,
@@ -54,7 +54,7 @@ func NewSealCalls(st paths.Store, ls *paths.Local, si paths.SectorIndex) *SealCa
 }
 
 type storageProvider struct {
-	storage             paths.Store
+	storage             *paths.Remote
 	localStore          *paths.Local
 	sindex              paths.SectorIndex
 	storageReservations *xsync.MapOf[harmonytask.TaskID, *StorageReservation]
@@ -69,7 +69,7 @@ func (l *storageProvider) AcquireSector(ctx context.Context, taskID *harmonytask
 	if taskID != nil {
 		resv, ok = l.storageReservations.Load(*taskID)
 	}
-	if ok {
+	if ok && resv != nil {
 		if resv.Alloc != allocate || resv.Existing != existing {
 			// this should never happen, only when task definition is wrong
 			return storiface.SectorPaths{}, nil, xerrors.Errorf("storage reservation type mismatch")
@@ -78,6 +78,7 @@ func (l *storageProvider) AcquireSector(ctx context.Context, taskID *harmonytask
 		log.Debugw("using existing storage reservation", "task", taskID, "sector", sector, "existing", existing, "allocate", allocate)
 
 		paths = resv.Paths
+		storageIDs = resv.PathIDs
 		releaseStorage = resv.Release
 	} else {
 		var err error

curiosrc/piece/task_cleanup_piece.go

@@ -0,0 +1,130 @@
+package piece
+
+import (
+	"context"
+	"time"
+
+	"golang.org/x/xerrors"
+
+	"github.com/filecoin-project/lotus/curiosrc/ffi"
+	"github.com/filecoin-project/lotus/lib/harmony/harmonydb"
+	"github.com/filecoin-project/lotus/lib/harmony/harmonytask"
+	"github.com/filecoin-project/lotus/lib/harmony/resources"
+	"github.com/filecoin-project/lotus/lib/promise"
+	"github.com/filecoin-project/lotus/storage/sealer/storiface"
+)
+
+type CleanupPieceTask struct {
+	max int
+	db  *harmonydb.DB
+	sc  *ffi.SealCalls
+
+	TF promise.Promise[harmonytask.AddTaskFunc]
+}
+
+func NewCleanupPieceTask(db *harmonydb.DB, sc *ffi.SealCalls, max int) *CleanupPieceTask {
+	pt := &CleanupPieceTask{
+		db: db,
+		sc: sc,
+
+		max: max,
+	}
+	go pt.pollCleanupTasks(context.Background())
+	return pt
+}
+
+func (c *CleanupPieceTask) pollCleanupTasks(ctx context.Context) {
+	for {
+		// select pieces with no refs and null cleanup_task_id
+		var pieceIDs []struct {
+			ID storiface.PieceNumber `db:"id"`
+		}
+
+		err := c.db.Select(ctx, &pieceIDs, `SELECT id FROM parked_pieces WHERE cleanup_task_id IS NULL AND (SELECT count(*) FROM parked_piece_refs WHERE piece_id = parked_pieces.id) = 0`)
+		if err != nil {
+			log.Errorf("failed to get parked pieces: %s", err)
+			time.Sleep(PieceParkPollInterval)
+			continue
+		}
+
+		if len(pieceIDs) == 0 {
+			time.Sleep(PieceParkPollInterval)
+			continue
+		}
+
+		for _, pieceID := range pieceIDs {
+			pieceID := pieceID
+
+			// create a task for each piece
+			c.TF.Val(ctx)(func(id harmonytask.TaskID, tx *harmonydb.Tx) (shouldCommit bool, err error) {
+				// update
+				n, err := tx.Exec(`UPDATE parked_pieces SET cleanup_task_id = $1 WHERE id = $2 AND (SELECT count(*) FROM parked_piece_refs WHERE piece_id = parked_pieces.id) = 0`, id, pieceID.ID)
+				if err != nil {
+					return false, xerrors.Errorf("updating parked piece: %w", err)
+				}
+
+				// commit only if we updated the piece
+				return n > 0, nil
+			})
+		}
+	}
+}
+
+func (c *CleanupPieceTask) Do(taskID harmonytask.TaskID, stillOwned func() bool) (done bool, err error) {
+	ctx := context.Background()
+
+	// select by cleanup_task_id
+	var pieceID int64
+
+	err = c.db.QueryRow(ctx, "SELECT id FROM parked_pieces WHERE cleanup_task_id = $1", taskID).Scan(&pieceID)
+	if err != nil {
+		return false, xerrors.Errorf("query parked_piece: %w", err)
+	}
+
+	// delete from parked_pieces where id = $1 where ref count = 0
+	// note: we delete from the db first because that guarantees that the piece is no longer in use
+	// if storage delete fails, it will be retried later is other cleanup tasks
+	n, err := c.db.Exec(ctx, "DELETE FROM parked_pieces WHERE id = $1 AND (SELECT count(*) FROM parked_piece_refs WHERE piece_id = $1) = 0", pieceID)
+	if err != nil {
+		return false, xerrors.Errorf("delete parked_piece: %w", err)
+	}
+
+	if n == 0 {
+		return true, nil
+	}
+
+	// remove from storage
+	err = c.sc.RemovePiece(ctx, storiface.PieceNumber(pieceID))
+	if err != nil {
+		log.Errorw("remove piece", "piece_id", pieceID, "error", err)
+	}
+
+	return true, nil
+}
+
+func (c *CleanupPieceTask) CanAccept(ids []harmonytask.TaskID, engine *harmonytask.TaskEngine) (*harmonytask.TaskID, error) {
+	// the remove call runs on paths.Remote storage, so it doesn't really matter where it runs
+
+	id := ids[0]
+	return &id, nil
+}
+
+func (c *CleanupPieceTask) TypeDetails() harmonytask.TaskTypeDetails {
+	return harmonytask.TaskTypeDetails{
+		Max:  c.max,
+		Name: "DropPiece",
+		Cost: resources.Resources{
+			Cpu:     1,
+			Gpu:     0,
+			Ram:     64 << 20,
+			Storage: nil,
+		},
+		MaxFailures: 10,
+	}
+}
+
+func (c *CleanupPieceTask) Adder(taskFunc harmonytask.AddTaskFunc) {
+	c.TF.Set(taskFunc)
+}
+
+var _ harmonytask.TaskInterface = &CleanupPieceTask{}

curiosrc/piece/task_park_piece.go

@@ -0,0 +1,220 @@
+package piece
+
+import (
+	"context"
+	"encoding/json"
+	"strconv"
+	"time"
+
+	logging "github.com/ipfs/go-log/v2"
+	"golang.org/x/xerrors"
+
+	"github.com/filecoin-project/lotus/curiosrc/ffi"
+	"github.com/filecoin-project/lotus/curiosrc/seal"
+	"github.com/filecoin-project/lotus/lib/harmony/harmonydb"
+	"github.com/filecoin-project/lotus/lib/harmony/harmonytask"
+	"github.com/filecoin-project/lotus/lib/harmony/resources"
+	"github.com/filecoin-project/lotus/lib/promise"
+	"github.com/filecoin-project/lotus/storage/sealer/storiface"
+)
+
+var log = logging.Logger("lppiece")
+var PieceParkPollInterval = time.Second * 15
+
+// ParkPieceTask gets a piece from some origin, and parks it in storage
+// Pieces are always f00, piece ID is mapped to pieceCID in the DB
+type ParkPieceTask struct {
+	db *harmonydb.DB
+	sc *ffi.SealCalls
+
+	TF promise.Promise[harmonytask.AddTaskFunc]
+
+	max int
+}
+
+func NewParkPieceTask(db *harmonydb.DB, sc *ffi.SealCalls, max int) *ParkPieceTask {
+	pt := &ParkPieceTask{
+		db: db,
+		sc: sc,
+
+		max: max,
+	}
+	go pt.pollPieceTasks(context.Background())
+	return pt
+}
+
+func (p *ParkPieceTask) pollPieceTasks(ctx context.Context) {
+	for {
+		// select parked pieces with no task_id
+		var pieceIDs []struct {
+			ID storiface.PieceNumber `db:"id"`
+		}
+
+		err := p.db.Select(ctx, &pieceIDs, `SELECT id FROM parked_pieces WHERE complete = FALSE AND task_id IS NULL`)
+		if err != nil {
+			log.Errorf("failed to get parked pieces: %s", err)
+			time.Sleep(PieceParkPollInterval)
+			continue
+		}
+
+		if len(pieceIDs) == 0 {
+			time.Sleep(PieceParkPollInterval)
+			continue
+		}
+
+		for _, pieceID := range pieceIDs {
+			pieceID := pieceID
+
+			// create a task for each piece
+			p.TF.Val(ctx)(func(id harmonytask.TaskID, tx *harmonydb.Tx) (shouldCommit bool, err error) {
+				// update
+				n, err := tx.Exec(`UPDATE parked_pieces SET task_id = $1 WHERE id = $2 AND complete = FALSE AND task_id IS NULL`, id, pieceID.ID)
+				if err != nil {
+					return false, xerrors.Errorf("updating parked piece: %w", err)
+				}
+
+				// commit only if we updated the piece
+				return n > 0, nil
+			})
+		}
+	}
+}
+
+func (p *ParkPieceTask) Do(taskID harmonytask.TaskID, stillOwned func() bool) (done bool, err error) {
+	ctx := context.Background()
+
+	// Define a struct to hold piece data.
+	var piecesData []struct {
+		PieceID         int64     `db:"id"`
+		PieceCreatedAt  time.Time `db:"created_at"`
+		PieceCID        string    `db:"piece_cid"`
+		Complete        bool      `db:"complete"`
+		PiecePaddedSize int64     `db:"piece_padded_size"`
+		PieceRawSize    string    `db:"piece_raw_size"`
+	}
+
+	// Select the piece data using the task ID.
+	err = p.db.Select(ctx, &piecesData, `
+        SELECT id, created_at, piece_cid, complete, piece_padded_size, piece_raw_size
+        FROM parked_pieces
+        WHERE task_id = $1
+    `, taskID)
+	if err != nil {
+		return false, xerrors.Errorf("fetching piece data: %w", err)
+	}
+
+	if len(piecesData) == 0 {
+		return false, xerrors.Errorf("no piece data found for task_id: %d", taskID)
+	}
+
+	pieceData := piecesData[0]
+
+	if pieceData.Complete {
+		log.Warnw("park piece task already complete", "task_id", taskID, "piece_cid", pieceData.PieceCID)
+		return true, nil
+	}
+
+	// Define a struct for reference data.
+	var refData []struct {
+		DataURL     string          `db:"data_url"`
+		DataHeaders json.RawMessage `db:"data_headers"`
+	}
+
+	// Now, select the first reference data that has a URL.
+	err = p.db.Select(ctx, &refData, `
+        SELECT data_url, data_headers
+        FROM parked_piece_refs
+        WHERE piece_id = $1 AND data_url IS NOT NULL
+        LIMIT 1
+    `, pieceData.PieceID)
+	if err != nil {
+		return false, xerrors.Errorf("fetching reference data: %w", err)
+	}
+
+	if len(refData) == 0 {
+		return false, xerrors.Errorf("no refs found for piece_id: %d", pieceData.PieceID)
+	}
+
+	// Convert piece_raw_size from string to int64.
+	pieceRawSize, err := strconv.ParseInt(pieceData.PieceRawSize, 10, 64)
+	if err != nil {
+		return false, xerrors.Errorf("parsing piece raw size: %w", err)
+	}
+
+	if refData[0].DataURL != "" {
+		upr := &seal.UrlPieceReader{
+			Url:     refData[0].DataURL,
+			RawSize: pieceRawSize,
+		}
+		defer func() {
+			_ = upr.Close()
+		}()
+
+		pnum := storiface.PieceNumber(pieceData.PieceID)
+
+		if err := p.sc.WritePiece(ctx, pnum, pieceRawSize, upr); err != nil {
+			return false, xerrors.Errorf("write piece: %w", err)
+		}
+
+		// Update the piece as complete after a successful write.
+		_, err = p.db.Exec(ctx, `UPDATE parked_pieces SET complete = TRUE WHERE id = $1`, pieceData.PieceID)
+		if err != nil {
+			return false, xerrors.Errorf("marking piece as complete: %w", err)
+		}
+
+		return true, nil
+	}
+
+	// If no URL is found, this indicates an issue since at least one URL is expected.
+	return false, xerrors.Errorf("no data URL found for piece_id: %d", pieceData.PieceID)
+}
+
+func (p *ParkPieceTask) CanAccept(ids []harmonytask.TaskID, engine *harmonytask.TaskEngine) (*harmonytask.TaskID, error) {
+	id := ids[0]
+	return &id, nil
+}
+
+func (p *ParkPieceTask) TypeDetails() harmonytask.TaskTypeDetails {
+	const maxSizePiece = 64 << 30
+
+	return harmonytask.TaskTypeDetails{
+		Max:  p.max,
+		Name: "ParkPiece",
+		Cost: resources.Resources{
+			Cpu:     1,
+			Gpu:     0,
+			Ram:     64 << 20,
+			Storage: p.sc.Storage(p.taskToRef, storiface.FTPiece, storiface.FTNone, maxSizePiece, storiface.PathSealing),
+		},
+		MaxFailures: 10,
+	}
+}
+
+func (p *ParkPieceTask) taskToRef(id harmonytask.TaskID) (ffi.SectorRef, error) {
+	var pieceIDs []struct {
+		ID storiface.PieceNumber `db:"id"`
+	}
+
+	err := p.db.Select(context.Background(), &pieceIDs, `SELECT id FROM parked_pieces WHERE task_id = $1`, id)
+	if err != nil {
+		return ffi.SectorRef{}, xerrors.Errorf("getting piece id: %w", err)
+	}
+
+	if len(pieceIDs) != 1 {
+		return ffi.SectorRef{}, xerrors.Errorf("expected 1 piece id, got %d", len(pieceIDs))
+	}
+
+	pref := pieceIDs[0].ID.Ref()
+
+	return ffi.SectorRef{
+		SpID:         int64(pref.ID.Miner),
+		SectorNumber: int64(pref.ID.Number),
+		RegSealProof: pref.ProofType,
+	}, nil
+}
+
+func (p *ParkPieceTask) Adder(taskFunc harmonytask.AddTaskFunc) {
+	p.TF.Set(taskFunc)
+}
+
+var _ harmonytask.TaskInterface = &ParkPieceTask{}

curiosrc/seal/finalize_pieces.go

@@ -0,0 +1,51 @@
+package seal
+
+import (
+	"context"
+	"net/url"
+	"strconv"
+
+	"golang.org/x/xerrors"
+
+	"github.com/filecoin-project/go-state-types/abi"
+
+	"github.com/filecoin-project/lotus/lib/harmony/harmonydb"
+)
+
+func DropSectorPieceRefs(ctx context.Context, db *harmonydb.DB, sid abi.SectorID) error {
+	//_, err := db.Exec(ctx, `SELECT FROM sectors_sdr_initial_pieces WHERE sp_id = $1 AND sector_number = $2`, sid.Miner, sid.Number)
+
+	var PieceURL []struct {
+		URL string `db:"data_url"`
+	}
+
+	err := db.Select(ctx, &PieceURL, `SELECT data_url FROM sectors_sdr_initial_pieces WHERE sp_id = $1 AND sector_number = $2`, sid.Miner, sid.Number)
+	if err != nil {
+		return xerrors.Errorf("getting piece url: %w", err)
+	}
+
+	for _, pu := range PieceURL {
+		gourl, err := url.Parse(pu.URL)
+		if err != nil {
+			log.Errorw("failed to parse piece url", "url", pu.URL, "error", err, "miner", sid.Miner, "sector", sid.Number)
+			continue
+		}
+
+		if gourl.Scheme == "pieceref" {
+			refID, err := strconv.ParseInt(gourl.Opaque, 10, 64)
+			if err != nil {
+				log.Errorw("failed to parse piece ref id", "url", pu.URL, "error", err, "miner", sid.Miner, "sector", sid.Number)
+				continue
+			}
+
+			n, err := db.Exec(ctx, `DELETE FROM parked_piece_refs WHERE ref_id = $1`, refID)
+			if err != nil {
+				log.Errorw("failed to delete piece ref", "url", pu.URL, "error", err, "miner", sid.Miner, "sector", sid.Number)
+			}
+
+			log.Debugw("deleted piece ref", "url", pu.URL, "miner", sid.Miner, "sector", sid.Number, "rows", n)
+		}
+	}
+
+	return err
+}

curiosrc/seal/task_finalize.go

@@ -69,6 +69,10 @@ func (f *FinalizeTask) Do(taskID harmonytask.TaskID, stillOwned func() bool) (do
 		return false, xerrors.Errorf("finalizing sector: %w", err)
 	}
 
+	if err := DropSectorPieceRefs(ctx, f.db, sector.ID); err != nil {
+		return false, xerrors.Errorf("dropping sector piece refs: %w", err)
+	}
+
 	// set after_finalize
 	_, err = f.db.Exec(ctx, `update sectors_sdr_pipeline set after_finalize=true where task_id_finalize=$1`, taskID)
 	if err != nil {

curiosrc/seal/task_sdr.go

@@ -187,8 +187,6 @@ func (s *SDRTask) getTicket(ctx context.Context, maddr address.Address) (abi.Sea
 }
 
 func (s *SDRTask) CanAccept(ids []harmonytask.TaskID, engine *harmonytask.TaskEngine) (*harmonytask.TaskID, error) {
-	// todo check storage (reserve too?)
-
 	id := ids[0]
 	return &id, nil
 }

curiosrc/seal/task_submit_precommit.go

@@ -9,12 +9,15 @@ import (
 
 	"github.com/filecoin-project/go-address"
 	"github.com/filecoin-project/go-state-types/abi"
+	actorstypes "github.com/filecoin-project/go-state-types/actors"
 	"github.com/filecoin-project/go-state-types/big"
 	"github.com/filecoin-project/go-state-types/builtin"
 	miner12 "github.com/filecoin-project/go-state-types/builtin/v12/miner"
+	"github.com/filecoin-project/go-state-types/network"
 
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
+	"github.com/filecoin-project/lotus/chain/actors/policy"
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/curiosrc/message"
 	"github.com/filecoin-project/lotus/curiosrc/multictladdr"
@@ -27,6 +30,7 @@ import (
 type SubmitPrecommitTaskApi interface {
 	StateMinerPreCommitDepositForPower(context.Context, address.Address, miner.SectorPreCommitInfo, types.TipSetKey) (big.Int, error)
 	StateMinerInfo(context.Context, address.Address, types.TipSetKey) (api.MinerInfo, error)
+	StateNetworkVersion(context.Context, types.TipSetKey) (network.Version, error)
 	ctladdr.NodeApi
 }
 
@@ -136,6 +140,23 @@ func (s *SubmitPrecommitTask) Do(taskID harmonytask.TaskID, stillOwned func() bo
 		}
 	}
 
+	nv, err := s.api.StateNetworkVersion(ctx, types.EmptyTSK)
+	if err != nil {
+		return false, xerrors.Errorf("getting network version: %w", err)
+	}
+	av, err := actorstypes.VersionForNetwork(nv)
+	if err != nil {
+		return false, xerrors.Errorf("failed to get actors version: %w", err)
+	}
+	msd, err := policy.GetMaxProveCommitDuration(av, sectorParams.RegSealProof)
+	if err != nil {
+		return false, xerrors.Errorf("failed to get max prove commit duration: %w", err)
+	}
+
+	if minExpiration := sectorParams.TicketEpoch + policy.MaxPreCommitRandomnessLookback + msd + miner.MinSectorExpiration; params.Sectors[0].Expiration < minExpiration {
+		params.Sectors[0].Expiration = minExpiration
+	}
+
 	var pbuf bytes.Buffer
 	if err := params.MarshalCBOR(&pbuf); err != nil {
 		return false, xerrors.Errorf("serializing params: %w", err)

curiosrc/seal/task_trees.go

@@ -4,6 +4,8 @@ import (
 	"context"
 	"io"
 	"net/http"
+	"net/url"
+	"strconv"
 
 	"github.com/ipfs/go-cid"
 	"golang.org/x/xerrors"
@@ -88,6 +90,15 @@ func (t *TreesTask) Do(taskID harmonytask.TaskID, stillOwned func() bool) (done
 	var dataReader io.Reader
 	var unpaddedData bool
 
+	var closers []io.Closer
+	defer func() {
+		for _, c := range closers {
+			if err := c.Close(); err != nil {
+				log.Errorw("error closing piece reader", "error", err)
+			}
+		}
+	}()
+
 	if len(pieces) > 0 {
 		pieceInfos := make([]abi.PieceInfo, len(pieces))
 		pieceReaders := make([]io.Reader, len(pieces))
@@ -106,10 +117,49 @@ func (t *TreesTask) Do(taskID harmonytask.TaskID, stillOwned func() bool) (done
 
 			// make pieceReader
 			if p.DataUrl != nil {
-				pieceReaders[i], _ = padreader.New(&UrlPieceReader{
+				dataUrl := *p.DataUrl
-					Url:     *p.DataUrl,
+
-					RawSize: *p.DataRawSize,
+				goUrl, err := url.Parse(dataUrl)
-				}, uint64(*p.DataRawSize))
+				if err != nil {
+					return false, xerrors.Errorf("parsing data URL: %w", err)
+				}
+
+				if goUrl.Scheme == "pieceref" {
+					// url is to a piece reference
+
+					refNum, err := strconv.ParseInt(goUrl.Opaque, 10, 64)
+					if err != nil {
+						return false, xerrors.Errorf("parsing piece reference number: %w", err)
+					}
+
+					// get pieceID
+					var pieceID []struct {
+						PieceID storiface.PieceNumber `db:"piece_id"`
+					}
+					err = t.db.Select(ctx, &pieceID, `SELECT piece_id FROM parked_piece_refs WHERE ref_id = $1`, refNum)
+					if err != nil {
+						return false, xerrors.Errorf("getting pieceID: %w", err)
+					}
+
+					if len(pieceID) != 1 {
+						return false, xerrors.Errorf("expected 1 pieceID, got %d", len(pieceID))
+					}
+
+					pr, err := t.sc.PieceReader(ctx, pieceID[0].PieceID)
+					if err != nil {
+						return false, xerrors.Errorf("getting piece reader: %w", err)
+					}
+
+					closers = append(closers, pr)
+
+					pieceReaders[i], _ = padreader.New(pr, uint64(*p.DataRawSize))
+				} else {
+					pieceReaders[i], _ = padreader.New(&UrlPieceReader{
+						Url:     dataUrl,
+						RawSize: *p.DataRawSize,
+					}, uint64(*p.DataRawSize))
+				}
+
 			} else { // padding piece (w/o fr32 padding, added in TreeD)
 				pieceReaders[i] = nullreader.NewNullReader(abi.PaddedPieceSize(p.PieceSize).Unpadded())
 			}
@@ -200,6 +250,7 @@ type UrlPieceReader struct {
 	RawSize int64 // the exact number of bytes read, if we read more or less that's an error
 
 	readSoFar int64
+	closed    bool
 	active    io.ReadCloser // auto-closed on EOF
 }
 
@@ -239,6 +290,7 @@ func (u *UrlPieceReader) Read(p []byte) (n int, err error) {
 	// If EOF is reached, close the reader
 	if err == io.EOF {
 		cerr := u.active.Close()
+		u.closed = true
 		if cerr != nil {
 			log.Errorf("error closing http piece reader: %s", cerr)
 		}
@@ -253,4 +305,13 @@ func (u *UrlPieceReader) Read(p []byte) (n int, err error) {
 	return n, err
 }
 
+func (u *UrlPieceReader) Close() error {
+	if !u.closed {
+		u.closed = true
+		return u.active.Close()
+	}
+
+	return nil
+}
+
 var _ harmonytask.TaskInterface = &TreesTask{}

documentation/en/api-v0-methods-miner.md

@@ -3954,6 +3954,7 @@ Response:
         0,
         1,
         0,
+        0,
         0
       ],
       "Read": [
@@ -3961,6 +3962,7 @@ Response:
         3,
         0,
         0,
+        0,
         0
       ]
     }

documentation/en/default-curio-config.toml

@@ -25,6 +25,18 @@
   # type: int
   #WinningPostMaxTasks = 0
 
+  # EnableParkPiece enables the "piece parking" task to run on this node. This task is responsible for fetching
+  # pieces from the network and storing them in the storage subsystem until sectors are sealed. This task is
+  # only applicable when integrating with boost, and should be enabled on nodes which will hold deal data
+  # from boost until sectors containing the related pieces have the TreeD/TreeR constructed.
+  # Note that future Curio implementations will have a separate task type for fetching pieces from the internet.
+  #
+  # type: bool
+  #EnableParkPiece = false
+
+  # type: int
+  #ParkPieceMaxTasks = 0
+
   # EnableSealSDR enables SDR tasks to run. SDR is the long sequential computation
   # creating 11 layer files in sector cache directory.
   # 

lib/harmony/harmonydb/sql/20240228-piece-park.sql

@@ -0,0 +1,35 @@
+create table parked_pieces (
+    id bigserial primary key,
+    created_at timestamp default current_timestamp,
+
+    piece_cid text not null,
+    piece_padded_size bigint not null,
+    piece_raw_size bigint not null,
+
+    complete boolean not null default false,
+    task_id bigint default null,
+
+    cleanup_task_id bigint default null,
+
+    foreign key (task_id) references harmony_task (id) on delete set null,
+    foreign key (cleanup_task_id) references harmony_task (id) on delete set null,
+    unique (piece_cid)
+);
+
+/*
+ * This table is used to keep track of the references to the parked pieces
+ * so that we can delete them when they are no longer needed.
+ *
+ * All references into the parked_pieces table should be done through this table.
+ *
+ * data_url is optional for refs which also act as data sources.
+ */
+create table parked_piece_refs (
+    ref_id bigserial primary key,
+    piece_id bigint not null,
+
+    data_url text,
+    data_headers jsonb not null default '{}',
+
+    foreign key (piece_id) references parked_pieces(id) on delete cascade
+);

lib/harmony/resources/getGPU.go

@@ -4,12 +4,23 @@
 package resources
 
 import (
+	"os"
+	"strconv"
 	"strings"
 
 	ffi "github.com/filecoin-project/filecoin-ffi"
 )
 
 func getGPUDevices() float64 { // GPU boolean
+	if nstr := os.Getenv("HARMONY_OVERRIDE_GPUS"); nstr != "" {
+		n, err := strconv.ParseFloat(nstr, 64)
+		if err != nil {
+			logger.Errorf("parsing HARMONY_OVERRIDE_GPUS failed: %+v", err)
+		} else {
+			return n
+		}
+	}
+
 	gpus, err := ffi.GetGPUDevices()
 	logger.Infow("GPUs", "list", gpus)
 	if err != nil {

node/config/doc_gen.go

@@ -330,6 +330,22 @@ documentation.`,
 
 			Comment: ``,
 		},
+		{
+			Name: "EnableParkPiece",
+			Type: "bool",
+
+			Comment: `EnableParkPiece enables the "piece parking" task to run on this node. This task is responsible for fetching
+pieces from the network and storing them in the storage subsystem until sectors are sealed. This task is
+only applicable when integrating with boost, and should be enabled on nodes which will hold deal data
+from boost until sectors containing the related pieces have the TreeD/TreeR constructed.
+Note that future Curio implementations will have a separate task type for fetching pieces from the internet.`,
+		},
+		{
+			Name: "ParkPieceMaxTasks",
+			Type: "int",
+
+			Comment: ``,
+		},
 		{
 			Name: "EnableSealSDR",
 			Type: "bool",

node/config/types.go

@@ -112,6 +112,14 @@ type CurioSubsystemsConfig struct {
 	EnableWinningPost   bool
 	WinningPostMaxTasks int
 
+	// EnableParkPiece enables the "piece parking" task to run on this node. This task is responsible for fetching
+	// pieces from the network and storing them in the storage subsystem until sectors are sealed. This task is
+	// only applicable when integrating with boost, and should be enabled on nodes which will hold deal data
+	// from boost until sectors containing the related pieces have the TreeD/TreeR constructed.
+	// Note that future Curio implementations will have a separate task type for fetching pieces from the internet.
+	EnableParkPiece   bool
+	ParkPieceMaxTasks int
+
 	// EnableSealSDR enables SDR tasks to run. SDR is the long sequential computation
 	// creating 11 layer files in sector cache directory.
 	//

storage/paths/http_handler.go

@@ -12,7 +12,6 @@ import (
 	"github.com/gorilla/mux"
 	"github.com/ipfs/go-cid"
 	logging "github.com/ipfs/go-log/v2"
-	"golang.org/x/xerrors"
 
 	"github.com/filecoin-project/go-state-types/abi"
 
@@ -340,18 +339,5 @@ func (handler *FetchHandler) generatePoRepVanillaProof(w http.ResponseWriter, r
 }
 
 func FileTypeFromString(t string) (storiface.SectorFileType, error) {
-	switch t {
+	return storiface.TypeFromString(t)
-	case storiface.FTUnsealed.String():
-		return storiface.FTUnsealed, nil
-	case storiface.FTSealed.String():
-		return storiface.FTSealed, nil
-	case storiface.FTCache.String():
-		return storiface.FTCache, nil
-	case storiface.FTUpdate.String():
-		return storiface.FTUpdate, nil
-	case storiface.FTUpdateCache.String():
-		return storiface.FTUpdateCache, nil
-	default:
-		return 0, xerrors.Errorf("unknown sector file type: '%s'", t)
-	}
 }

storage/paths/remote.go

@@ -747,6 +747,48 @@ func (r *Remote) Reader(ctx context.Context, s storiface.SectorRef, offset, size
 	return nil, nil
 }
 
+// ReaderSeq creates a simple sequential reader for a file. Does not work for
+// file types which are a directory (e.g. FTCache).
+func (r *Remote) ReaderSeq(ctx context.Context, s storiface.SectorRef, ft storiface.SectorFileType) (io.ReadCloser, error) {
+	paths, _, err := r.local.AcquireSector(ctx, s, ft, storiface.FTNone, storiface.PathStorage, storiface.AcquireMove)
+	if err != nil {
+		return nil, xerrors.Errorf("acquire local: %w", err)
+	}
+
+	path := storiface.PathByType(paths, ft)
+	if path != "" {
+		return os.Open(path)
+	}
+
+	si, err := r.index.StorageFindSector(ctx, s.ID, ft, 0, false)
+	if err != nil {
+		log.Debugf("Reader, did not find file on any of the workers %s (%s)", path, ft.String())
+		return nil, err
+	}
+
+	if len(si) == 0 {
+		return nil, xerrors.Errorf("failed to read sector %v from remote(%d): %w", s, ft, storiface.ErrSectorNotFound)
+	}
+
+	sort.Slice(si, func(i, j int) bool {
+		return si[i].Weight > si[j].Weight
+	})
+
+	for _, info := range si {
+		for _, url := range info.URLs {
+			rd, err := r.readRemote(ctx, url, 0, 0)
+			if err != nil {
+				log.Warnw("reading from remote", "url", url, "error", err)
+				continue
+			}
+
+			return rd, err
+		}
+	}
+
+	return nil, xerrors.Errorf("failed to read sector %v from remote(%d): %w", s, ft, storiface.ErrSectorNotFound)
+}
+
 func (r *Remote) Reserve(ctx context.Context, sid storiface.SectorRef, ft storiface.SectorFileType, storageIDs storiface.SectorPaths, overheadTab map[storiface.SectorFileType]int) (func(), error) {
 	log.Warnf("reserve called on remote store, sectorID: %v", sid.ID)
 	return func() {

storage/sealer/ffiwrapper/basicfs/fs.go

@@ -39,6 +39,9 @@ func (b *Provider) AcquireSector(ctx context.Context, id storiface.SectorRef, ex
 	if err := os.Mkdir(filepath.Join(b.Root, storiface.FTUpdateCache.String()), 0755); err != nil && !os.IsExist(err) { // nolint
 		return storiface.SectorPaths{}, nil, err
 	}
+	if err := os.Mkdir(filepath.Join(b.Root, storiface.FTPiece.String()), 0755); err != nil && !os.IsExist(err) { // nolint
+		return storiface.SectorPaths{}, nil, err
+	}
 
 	done := func() {}
 

storage/sealer/storiface/filetype.go

@@ -9,16 +9,22 @@ import (
 )
 
 const (
+	// "regular" sectors
 	FTUnsealed SectorFileType = 1 << iota
 	FTSealed
 	FTCache
+
+	// snap
 	FTUpdate
 	FTUpdateCache
 
+	// Piece Park
+	FTPiece
+
 	FileTypes = iota
 )
 
-var PathTypes = []SectorFileType{FTUnsealed, FTSealed, FTCache, FTUpdate, FTUpdateCache}
+var PathTypes = []SectorFileType{FTUnsealed, FTSealed, FTCache, FTUpdate, FTUpdateCache, FTPiece}
 
 const (
 	FTNone SectorFileType = 0
@@ -39,6 +45,7 @@ var FSOverheadSeal = map[SectorFileType]int{ // 10x overheads
 	FTUpdate:      FSOverheadDen,
 	FTUpdateCache: FSOverheadDen*2 + 1,
 	FTCache:       141, // 11 layers + D(2x ssize) + C + R'
+	FTPiece:       FSOverheadDen,
 }
 
 // sector size * disk / fs overhead.  FSOverheadDen is like the unit of sector size
@@ -49,6 +56,7 @@ var FsOverheadFinalized = map[SectorFileType]int{
 	FTUpdate:      FSOverheadDen,
 	FTUpdateCache: 1,
 	FTCache:       1,
+	FTPiece:       FSOverheadDen,
 }
 
 type SectorFileType int
@@ -65,6 +73,8 @@ func TypeFromString(s string) (SectorFileType, error) {
 		return FTUpdate, nil
 	case "update-cache":
 		return FTUpdateCache, nil
+	case "piece":
+		return FTPiece, nil
 	default:
 		return 0, xerrors.Errorf("unknown sector file type '%s'", s)
 	}
@@ -82,6 +92,8 @@ func (t SectorFileType) String() string {
 		return "update"
 	case FTUpdateCache:
 		return "update-cache"
+	case FTPiece:
+		return "piece"
 	default:
 		return fmt.Sprintf("<unknown %d %v>", t, (t & ((1 << FileTypes) - 1)).Strings())
 	}
@@ -206,6 +218,7 @@ type SectorPaths struct {
 	Cache       string
 	Update      string
 	UpdateCache string
+	Piece       string
 }
 
 func ParseSectorID(baseName string) (abi.SectorID, error) {
@@ -242,6 +255,8 @@ func PathByType(sps SectorPaths, fileType SectorFileType) string {
 		return sps.Update
 	case FTUpdateCache:
 		return sps.UpdateCache
+	case FTPiece:
+		return sps.Piece
 	}
 
 	panic("requested unknown path type")
@@ -259,5 +274,7 @@ func SetPathByType(sps *SectorPaths, fileType SectorFileType, p string) {
 		sps.Update = p
 	case FTUpdateCache:
 		sps.UpdateCache = p
+	case FTPiece:
+		sps.Piece = p
 	}
 }

storage/sealer/storiface/storage.go

@@ -20,6 +20,17 @@ type SectorRef struct {
 
 var NoSectorRef = SectorRef{}
 
+// PieceNumber is a reference to a piece in the storage system; mapping between
+// pieces in the storage system and piece CIDs is maintained by the storage index
+type PieceNumber uint64
+
+func (pn PieceNumber) Ref() SectorRef {
+	return SectorRef{
+		ID:        abi.SectorID{Miner: 0, Number: abi.SectorNumber(pn)},
+		ProofType: abi.RegisteredSealProof_StackedDrg64GiBV1, // This only cares about TreeD which is the same for all sizes
+	}
+}
+
 type ProverPoSt interface {
 	GenerateWinningPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof.ExtendedSectorInfo, randomness abi.PoStRandomness) ([]proof.PoStProof, error)
 	GenerateWindowPoSt(ctx context.Context, minerID abi.ActorID, ppt abi.RegisteredPoStProof, sectorInfo []proof.ExtendedSectorInfo, randomness abi.PoStRandomness) (proof []proof.PoStProof, skipped []abi.SectorID, err error)