store sums in a big ol slice

1 files changed, 0 insertions, 129 deletions

diff --git a/lib/btrfsprogs/btrfsinspect/scanforextents/csum.go b/lib/btrfsprogs/btrfsinspect/scanforextents/csum.go
deleted file mode 100644
index ec46833..0000000
--- a/lib/btrfsprogs/btrfsinspect/scanforextents/csum.go
+++ /dev/null
@@ -1,129 +0,0 @@
-// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
-//
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-package scanforextents
-
-import (
-	"context"
-	"errors"
-	"fmt"
-
-	"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"
-)
-
-const csumBlockSize = 4 * 1024
-
-func ChecksumLogical(fs btrfs.Trees, alg btrfssum.CSumType, laddr btrfsvol.LogicalAddr) (btrfssum.CSum, error) {
-	var dat [csumBlockSize]byte
-	if _, err := fs.ReadAt(dat[:], laddr); err != nil {
-		return btrfssum.CSum{}, err
-	}
-	return alg.Sum(dat[:])
-}
-
-func ChecksumPhysical(dev *btrfs.Device, alg btrfssum.CSumType, paddr btrfsvol.PhysicalAddr) (btrfssum.CSum, error) {
-	var dat [csumBlockSize]byte
-	if _, err := dev.ReadAt(dat[:], paddr); err != nil {
-		return btrfssum.CSum{}, err
-	}
-	return alg.Sum(dat[:])
-}
-
-func ChecksumQualifiedPhysical(fs *btrfs.FS, alg btrfssum.CSumType, paddr btrfsvol.QualifiedPhysicalAddr) (btrfssum.CSum, error) {
-	dev := fs.LV.PhysicalVolumes()[paddr.Dev]
-	if dev == nil {
-		return btrfssum.CSum{}, fmt.Errorf("no such device_id=%v", paddr.Dev)
-	}
-	return ChecksumPhysical(dev, alg, paddr.Addr)
-}
-
-type shortSum string
-
-func readCSumTree(ctx context.Context, fs btrfs.Trees) map[shortSum][]btrfsvol.LogicalAddr {
-	sb, _ := fs.Superblock()
-
-	sum2laddrs := make(map[shortSum][]btrfsvol.LogicalAddr)
-	var cntUnmapped, cntErr, cntMismatch, cntValid int
-	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, treeSum := range body.Sums {
-					laddr := btrfsvol.LogicalAddr(item.Key.Offset) + (btrfsvol.LogicalAddr(i) * csumBlockSize)
-					readSum, err := ChecksumLogical(fs, sb.ChecksumType, laddr)
-					if err != nil {
-						if errors.Is(err, btrfsvol.ErrCouldNotMap) {
-							cntUnmapped++
-							treeShortSum := shortSum(treeSum[:body.ChecksumSize])
-							sum2laddrs[treeShortSum] = append(sum2laddrs[treeShortSum], laddr)
-							continue
-						}
-						dlog.Error(ctx, err)
-						cntErr++
-						continue
-					}
-					if readSum != treeSum {
-						dlog.Errorf(ctx, "checksum mismatch at laddr=%v: CSUM_TREE=%v != read=%v",
-							laddr, treeSum, readSum)
-						cntMismatch++
-						continue
-					}
-					cntValid++
-				}
-				return nil
-			},
-		},
-	)
-
-	total := cntErr + cntUnmapped + cntMismatch + cntValid
-	dlog.Infof(ctx, "  checksum errors          : %v", cntErr)
-	dlog.Infof(ctx, "  unmapped checksums       : %v", cntUnmapped)
-	dlog.Infof(ctx, "  mismatched checksums     : %v", cntMismatch)
-	dlog.Infof(ctx, "  valid checksums          : %v", cntValid)
-	dlog.Infof(ctx, "  -------------------------:")
-	dlog.Infof(ctx, "  total checksums          : %v", total)
-	dlog.Infof(ctx, "  distinct unmapped        : %v", len(sum2laddrs))
-
-	return sum2laddrs
-}
-
-func LookupCSum(fs btrfs.Trees, alg btrfssum.CSumType, laddr btrfsvol.LogicalAddr) (map[btrfsvol.LogicalAddr]btrfssum.CSum, error) {
-	item, err := fs.TreeSearch(btrfs.CSUM_TREE_OBJECTID, func(key btrfs.Key, size uint32) int {
-		itemBeg := btrfsvol.LogicalAddr(key.ObjectID)
-		numSums := int64(size) / int64(alg.Size())
-		itemEnd := itemBeg + btrfsvol.LogicalAddr(numSums*csumBlockSize)
-		switch {
-		case itemEnd <= laddr:
-			return 1
-		case laddr < itemBeg:
-			return -1
-		default:
-			return 0
-		}
-	})
-	if err != nil {
-		return nil, err
-	}
-	body, ok := item.Body.(btrfsitem.ExtentCSum)
-	if !ok {
-		return nil, fmt.Errorf("item body is %T not ExtentCSum", item.Body)
-	}
-	ret := make(map[btrfsvol.LogicalAddr]btrfssum.CSum, len(body.Sums))
-	for i, sum := range body.Sums {
-		ret[btrfsvol.LogicalAddr(item.Key.ObjectID)+(btrfsvol.LogicalAddr(i)*csumBlockSize)] = sum
-	}
-	return ret, nil
-}