From c8c3f8b5f1b7a7f61c4fc1dda99062cedff66841 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Mon, 29 Aug 2022 21:07:25 -0600
Subject: wip

---
 lib/btrfsprogs/btrfsinspect/rebuildnodes/rebuildnodes.go   |  2 --
 lib/btrfsprogs/btrfsinspect/rebuildnodes/s1_uuidmap.go     |  5 ++++-
 .../btrfsinspect/rebuildnodes/s2_lostandfound.go           | 14 +++++++++++++-
 3 files changed, 17 insertions(+), 4 deletions(-)

(limited to 'lib')

diff --git a/lib/btrfsprogs/btrfsinspect/rebuildnodes/rebuildnodes.go b/lib/btrfsprogs/btrfsinspect/rebuildnodes/rebuildnodes.go
index e5ae5e4..c02600d 100644
--- a/lib/btrfsprogs/btrfsinspect/rebuildnodes/rebuildnodes.go
+++ b/lib/btrfsprogs/btrfsinspect/rebuildnodes/rebuildnodes.go
@@ -35,12 +35,10 @@ func RebuildNodes(ctx context.Context, fs *btrfs.FS, nodeScanResults btrfsinspec
 		uuidMap: uuidMap,
 	}
 
-	dlog.Info(ctx, "Identifying lost+found nodes...")
 	foundRoots, err := lostAndFoundNodes(ctx, nfs, nodeScanResults)
 	if err != nil {
 		return nil, err
 	}
-	dlog.Infof(ctx, "... identified %d lost+found nodes", len(foundRoots))
 
 	dlog.Info(ctx, "Initializing nodes to re-build...")
 	rebuiltNodes, err := reInitBrokenNodes(ctx, nfs, nodeScanResults, foundRoots)
diff --git a/lib/btrfsprogs/btrfsinspect/rebuildnodes/s1_uuidmap.go b/lib/btrfsprogs/btrfsinspect/rebuildnodes/s1_uuidmap.go
index ba090fb..b29c201 100644
--- a/lib/btrfsprogs/btrfsinspect/rebuildnodes/s1_uuidmap.go
+++ b/lib/btrfsprogs/btrfsinspect/rebuildnodes/s1_uuidmap.go
@@ -99,7 +99,10 @@ func buildUUIDMap(ctx context.Context, fs *btrfs.FS, scanResults btrfsinspect.Sc
 			progress()
 		}
 	}
-	progress()
+
+	if done != total {
+		panic("should not happen")
+	}
 
 	missing := make(map[btrfsprim.ObjID]struct{})
 	for treeID := range seenTreeIDs {
diff --git a/lib/btrfsprogs/btrfsinspect/rebuildnodes/s2_lostandfound.go b/lib/btrfsprogs/btrfsinspect/rebuildnodes/s2_lostandfound.go
index 8da8588..2448033 100644
--- a/lib/btrfsprogs/btrfsinspect/rebuildnodes/s2_lostandfound.go
+++ b/lib/btrfsprogs/btrfsinspect/rebuildnodes/s2_lostandfound.go
@@ -19,7 +19,11 @@ import (
 	"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
 )
 
+// lostAndFoundNodes returns the set of nodes don't have another node
+// claiming it as a child.
 func lostAndFoundNodes(ctx context.Context, fs _FS, nodeScanResults btrfsinspect.ScanDevicesResult) (map[btrfsvol.LogicalAddr]struct{}, error) {
+	dlog.Info(ctx, "Identifying lost+found nodes...")
+
 	lastPct := -1
 	total := countNodes(nodeScanResults)
 	progress := func(done int) {
@@ -62,6 +66,9 @@ func lostAndFoundNodes(ctx context.Context, fs _FS, nodeScanResults btrfsinspect
 			}
 		}
 	}
+	if len(attachedNodes)+len(orphanedNodes) != total {
+		panic("should not happen")
+	}
 	dlog.Infof(ctx,
 		"... (finished processing %v attached nodes, proceeding to process %v lost nodes, for a total of %v)",
 		len(attachedNodes), len(orphanedNodes), len(attachedNodes)+len(orphanedNodes))
@@ -73,7 +80,7 @@ func lostAndFoundNodes(ctx context.Context, fs _FS, nodeScanResults btrfsinspect
 		orphanedRoots[node] = struct{}{}
 	}
 	done := len(attachedNodes)
-	for potentialRoot := range orphanedRoots {
+	for potentialRoot := range orphanedNodes {
 		done++
 		progress(done)
 		if orphanedNodes[potentialRoot] > 1 {
@@ -101,5 +108,10 @@ func lostAndFoundNodes(ctx context.Context, fs _FS, nodeScanResults btrfsinspect
 		)
 	}
 
+	if done != total {
+		panic("should not happen")
+	}
+
+	dlog.Infof(ctx, "... identified %d lost+found nodes", len(orphanedRoots))
 	return orphanedRoots, nil
 }
-- 
cgit v1.2.3-2-g168b