rename: Move allsums.go to the rebuildmappings package

3 files changed, 217 insertions, 2 deletions

diff --git a/lib/btrfsprogs/btrfsinspect/rebuildmappings/allsums.go b/lib/btrfsprogs/btrfsinspect/rebuildmappings/allsums.go
new file mode 100644
index 0000000..43d09fe
--- /dev/null
+++ b/lib/btrfsprogs/btrfsinspect/rebuildmappings/allsums.go
@@ -0,0 +1,215 @@
+// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package rebuildmappings
+
+import (
+	"context"
+	"encoding/gob"
+	"io"
+	"math"
+	"os"
+	"runtime"
+	"strings"
+	"sync"
+
+	"github.com/datawire/dlib/dgroup"
+	"github.com/datawire/dlib/dlog"
+
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfssum"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsinspect"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsutil"
+)
+
+type AllSums struct {
+	Logical  []btrfsinspect.SumRun[btrfsvol.LogicalAddr]
+	Physical map[btrfsvol.DeviceID]btrfsinspect.SumRun[btrfsvol.PhysicalAddr]
+}
+
+func (as AllSums) SumForPAddr(paddr btrfsvol.QualifiedPhysicalAddr) (btrfsinspect.ShortSum, bool) {
+	run, ok := as.Physical[paddr.Dev]
+	if !ok {
+		return "", false
+	}
+	return run.SumForAddr(paddr.Addr)
+}
+
+func (as AllSums) RunForLAddr(laddr btrfsvol.LogicalAddr) (btrfsinspect.SumRun[btrfsvol.LogicalAddr], btrfsvol.LogicalAddr, bool) {
+	for _, run := range as.Logical {
+		if run.Addr > laddr {
+			return btrfsinspect.SumRun[btrfsvol.LogicalAddr]{}, run.Addr, false
+		}
+		if run.Addr.Add(run.Size()) <= laddr {
+			continue
+		}
+		return run, 0, true
+	}
+	return btrfsinspect.SumRun[btrfsvol.LogicalAddr]{}, math.MaxInt64, false
+}
+
+func (as AllSums) SumForLAddr(laddr btrfsvol.LogicalAddr) (btrfsinspect.ShortSum, bool) {
+	run, _, ok := as.RunForLAddr(laddr)
+	if !ok {
+		return "", false
+	}
+	return run.SumForAddr(laddr)
+}
+
+func (as AllSums) WalkLogical(ctx context.Context, fn func(btrfsvol.LogicalAddr, btrfsinspect.ShortSum) error) error {
+	for _, run := range as.Logical {
+		if err := run.Walk(ctx, fn); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Read/Write AllSums ////////////////////////////////////////////////
+
+func ReadAllSums(filename string) (AllSums, error) {
+	fh, err := os.Open(filename)
+	if err != nil {
+		return AllSums{}, err
+	}
+	defer fh.Close()
+	var val AllSums
+	if err := gob.NewDecoder(fh).Decode(&val); err != nil {
+		return AllSums{}, err
+	}
+	return val, nil
+}
+
+func WriteAllSums(w io.Writer, sums AllSums) error {
+	return gob.NewEncoder(w).Encode(sums)
+}
+
+func SumEverything(ctx context.Context, fs *btrfs.FS) (AllSums, error) {
+	var ret AllSums
+
+	// ChecksumSize
+	var alg btrfssum.CSumType
+	var csumSize int
+	if err := func() error {
+		sb, err := fs.Superblock()
+		if err != nil {
+			return err
+		}
+		alg = sb.ChecksumType
+		csumSize = alg.Size()
+		return nil
+	}(); err != nil {
+		return ret, err
+	}
+
+	// Logical
+	dlog.Info(ctx, "Walking CSUM_TREE...")
+	func() {
+		var curAddr btrfsvol.LogicalAddr
+		var curSums strings.Builder
+		btrfsutil.NewBrokenTrees(ctx, fs).TreeWalk(ctx, btrfs.CSUM_TREE_OBJECTID,
+			func(err *btrfs.TreeError) {
+				dlog.Error(ctx, err)
+			},
+			btrfs.TreeWalkHandler{
+				Item: func(path btrfs.TreePath, item btrfs.Item) error {
+					if item.Key.ItemType != btrfsitem.EXTENT_CSUM_KEY {
+						return nil
+					}
+					body := item.Body.(btrfsitem.ExtentCSum)
+
+					for i, sum := range body.Sums {
+						laddr := btrfsvol.LogicalAddr(item.Key.Offset) + (btrfsvol.LogicalAddr(i) * btrfsitem.CSumBlockSize)
+						if laddr != curAddr+(btrfsvol.LogicalAddr(curSums.Len()/csumSize)*btrfsitem.CSumBlockSize) {
+							if curSums.Len() > 0 {
+								ret.Logical = append(ret.Logical, btrfsinspect.SumRun[btrfsvol.LogicalAddr]{
+									ChecksumSize: csumSize,
+									Addr:         curAddr,
+									Sums:         curSums.String(),
+								})
+							}
+							curAddr = laddr
+							curSums.Reset()
+						}
+						curSums.Write(sum[:csumSize])
+					}
+					return nil
+				},
+			},
+		)
+		if curSums.Len() > 0 {
+			ret.Logical = append(ret.Logical, btrfsinspect.SumRun[btrfsvol.LogicalAddr]{
+				ChecksumSize: csumSize,
+				Addr:         curAddr,
+				Sums:         curSums.String(),
+			})
+		}
+	}()
+	if err := ctx.Err(); err != nil {
+		return ret, err
+	}
+	dlog.Info(ctx, "... done walking")
+	runtime.GC()
+	dlog.Info(ctx, "... GC'd")
+
+	// Physical
+	dlog.Info(ctx, "Summing devices...")
+	if err := func() error {
+		devs := fs.LV.PhysicalVolumes()
+
+		var mu sync.Mutex
+		ret.Physical = make(map[btrfsvol.DeviceID]btrfsinspect.SumRun[btrfsvol.PhysicalAddr], len(devs))
+
+		grp := dgroup.NewGroup(ctx, dgroup.GroupConfig{})
+		for devID, dev := range devs {
+			devID, dev := devID, dev
+			grp.Go(dev.Name(), func(ctx context.Context) error {
+				devSize := dev.Size()
+				numSums := int(devSize / btrfsitem.CSumBlockSize)
+				sums := make([]byte, numSums*csumSize)
+				lastPct := -1
+				progress := func(curSum int) {
+					pct := int(100 * float64(curSum) / float64(numSums))
+					if pct != lastPct || curSum == numSums {
+						dlog.Infof(ctx, "... dev[%q] summed %v%%",
+							dev.Name(), pct)
+						lastPct = pct
+					}
+				}
+				for i := 0; i < numSums; i++ {
+					if err := ctx.Err(); err != nil {
+						return err
+					}
+					progress(i)
+					sum, err := btrfsutil.ChecksumPhysical(dev, alg, btrfsvol.PhysicalAddr(i*btrfsitem.CSumBlockSize))
+					if err != nil {
+						return err
+					}
+					copy(sums[i*csumSize:], sum[:csumSize])
+				}
+				progress(numSums)
+				sumsStr := string(sums)
+				mu.Lock()
+				ret.Physical[devID] = btrfsinspect.SumRun[btrfsvol.PhysicalAddr]{
+					ChecksumSize: csumSize,
+					Addr:         0,
+					Sums:         sumsStr,
+				}
+				mu.Unlock()
+				return nil
+			})
+		}
+		return grp.Wait()
+	}(); err != nil {
+		return ret, err
+	}
+	dlog.Info(ctx, "... done summing devices")
+	runtime.GC()
+	dlog.Info(ctx, "... GC'd")
+
+	// Return
+	return ret, nil
+}
diff --git a/lib/btrfsprogs/btrfsinspect/rebuildmappings/gaps.go b/lib/btrfsprogs/btrfsinspect/rebuildmappings/gaps.go
index f5fb27a..418dba6 100644
--- a/lib/btrfsprogs/btrfsinspect/rebuildmappings/gaps.go
+++ b/lib/btrfsprogs/btrfsinspect/rebuildmappings/gaps.go
@@ -56,7 +56,7 @@ func roundUp[T constraints.Integer](x, multiple T) T {
 }
 
 func WalkGaps(ctx context.Context,
-	sums btrfsinspect.AllSums, gaps map[btrfsvol.DeviceID][]PhysicalGap,
+	sums AllSums, gaps map[btrfsvol.DeviceID][]PhysicalGap,
 	fn func(btrfsvol.DeviceID, btrfsinspect.SumRun[btrfsvol.PhysicalAddr]) error,
 ) error {
 	for _, devID := range maps.SortedKeys(gaps) {
diff --git a/lib/btrfsprogs/btrfsinspect/rebuildmappings/scan.go b/lib/btrfsprogs/btrfsinspect/rebuildmappings/scan.go
index 83c4a31..d37d00f 100644
--- a/lib/btrfsprogs/btrfsinspect/rebuildmappings/scan.go
+++ b/lib/btrfsprogs/btrfsinspect/rebuildmappings/scan.go
@@ -20,7 +20,7 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/slices"
 )
 
-func ScanForExtents(ctx context.Context, fs *btrfs.FS, blockgroups map[btrfsvol.LogicalAddr]BlockGroup, sums btrfsinspect.AllSums) error {
+func ScanForExtents(ctx context.Context, fs *btrfs.FS, blockgroups map[btrfsvol.LogicalAddr]BlockGroup, sums AllSums) error {
 	dlog.Info(ctx, "Pairing up blockgroups and sums...")
 	bgSums := make(map[btrfsvol.LogicalAddr]btrfsinspect.SumRunWithGaps[btrfsvol.LogicalAddr])
 	for i, bgLAddr := range maps.SortedKeys(blockgroups) {