From 2be1697ef0ec7ce1f364986a22ecdc404a6e7574 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Sat, 16 Jul 2022 20:13:13 -0600
Subject: better algo

---
 lib/btrfsprogs/btrfsinspect/scanforextents/gaps.go | 30 ++++++++++------------
 1 file changed, 13 insertions(+), 17 deletions(-)

(limited to 'lib/btrfsprogs/btrfsinspect/scanforextents/gaps.go')

diff --git a/lib/btrfsprogs/btrfsinspect/scanforextents/gaps.go b/lib/btrfsprogs/btrfsinspect/scanforextents/gaps.go
index f67b498..5963e53 100644
--- a/lib/btrfsprogs/btrfsinspect/scanforextents/gaps.go
+++ b/lib/btrfsprogs/btrfsinspect/scanforextents/gaps.go
@@ -12,6 +12,7 @@ import (
 
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
+	"git.lukeshu.com/btrfs-progs-ng/lib/maps"
 )
 
 type PhysicalGap struct {
@@ -53,30 +54,25 @@ func roundUp[T constraints.Integer](x, multiple T) T {
 }
 
 func WalkGaps(ctx context.Context,
-	gaps []PhysicalGap, blockSize btrfsvol.PhysicalAddr,
-	progress func(cur, total int64),
-	main func(btrfsvol.PhysicalAddr) error,
+	sums AllSums, gaps map[btrfsvol.DeviceID][]PhysicalGap,
+	fn func(btrfsvol.DeviceID, SumRun[btrfsvol.PhysicalAddr]) error,
 ) error {
-	var totalBlocks int64
-	for _, gap := range gaps {
-		for paddr := roundUp(gap.Beg, blockSize); paddr+blockSize <= gap.End; paddr += blockSize {
-			totalBlocks++
-		}
-	}
-
-	var curBlock int64
-	for _, gap := range gaps {
-		for paddr := roundUp(gap.Beg, blockSize); paddr+blockSize <= gap.End; paddr += blockSize {
+	for _, devID := range maps.SortedKeys(gaps) {
+		for _, gap := range gaps[devID] {
 			if err := ctx.Err(); err != nil {
 				return err
 			}
-			progress(curBlock, totalBlocks)
-			curBlock++
-			if err := main(paddr); err != nil {
+			begAddr := roundUp(gap.Beg, csumBlockSize)
+			begOff := int(begAddr/csumBlockSize) * sums.Physical[devID].ChecksumSize
+			endOff := int(gap.End/csumBlockSize) * sums.Physical[devID].ChecksumSize
+			if err := fn(devID, SumRun[btrfsvol.PhysicalAddr]{
+				ChecksumSize: sums.Physical[devID].ChecksumSize,
+				Addr:         begAddr,
+				Sums:         sums.Physical[devID].Sums[begOff:endOff],
+			}); err != nil {
 				return err
 			}
 		}
 	}
-	progress(curBlock, totalBlocks)
 	return nil
 }
-- 
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