lib/model: Use right db snap when scanning recvonly folder (#6769)

lib/model/folder.go

@@ -418,38 +418,39 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 		EventLogger:           f.evLogger,
 	})
 
-	batchFn := func(fs []protocol.FileInfo) error {
+	batch := newFileInfoBatch(func(fs []protocol.FileInfo) error {
 		if err := f.getHealthErrorWithoutIgnores(); err != nil {
 			l.Debugf("Stopping scan of folder %s due to: %s", f.Description(), err)
 			return err
 		}
 		f.updateLocalsFromScanning(fs)
 		return nil
-	}
+	})
+
+	var batchAppend func(protocol.FileInfo, *db.Snapshot)
 	// Resolve items which are identical with the global state.
-	if f.localFlags&protocol.FlagLocalReceiveOnly != 0 {
-		oldBatchFn := batchFn // can't reference batchFn directly (recursion)
-		batchFn = func(fs []protocol.FileInfo) error {
-			for i := range fs {
-				switch gf, ok := snap.GetGlobal(fs[i].Name); {
-				case !ok:
-					continue
-				case gf.IsEquivalentOptional(fs[i], f.ModTimeWindow(), false, false, protocol.FlagLocalReceiveOnly):
-					// What we have locally is equivalent to the global file.
-					fs[i].Version = fs[i].Version.Merge(gf.Version)
-					fallthrough
-				case fs[i].IsDeleted() && gf.IsReceiveOnlyChanged():
-					// Our item is deleted and the global item is our own
-					// receive only file. We can't delete file infos, so
-					// we just pretend it is a normal deleted file (nobody
-					// cares about that).
-					fs[i].LocalFlags &^= protocol.FlagLocalReceiveOnly
-				}
+	if f.localFlags&protocol.FlagLocalReceiveOnly == 0 {
+		batchAppend = func(fi protocol.FileInfo, _ *db.Snapshot) {
+			batch.append(fi)
+		}
+	} else {
+		batchAppend = func(fi protocol.FileInfo, snap *db.Snapshot) {
+			switch gf, ok := snap.GetGlobal(fi.Name); {
+			case !ok:
+			case gf.IsEquivalentOptional(fi, f.ModTimeWindow(), false, false, protocol.FlagLocalReceiveOnly):
+				// What we have locally is equivalent to the global file.
+				fi.Version = fi.Version.Merge(gf.Version)
+				fallthrough
+			case fi.IsDeleted() && gf.IsReceiveOnlyChanged():
+				// Our item is deleted and the global item is our own
+				// receive only file. We can't delete file infos, so
+				// we just pretend it is a normal deleted file (nobody
+				// cares about that).
+				fi.LocalFlags &^= protocol.FlagLocalReceiveOnly
 			}
-			return oldBatchFn(fs)
+			batch.append(fi)
 		}
 	}
-	batch := newFileInfoBatch(batchFn)
 
 	// Schedule a pull after scanning, but only if we actually detected any
 	// changes.
@@ -472,12 +473,12 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 			return err
 		}
 
-		batch.append(res.File)
+		batchAppend(res.File, snap)
 		changes++
 
 		if f.localFlags&protocol.FlagLocalReceiveOnly == 0 {
 			if nf, ok := f.findRename(snap, mtimefs, res.File, alreadyUsed); ok {
-				batch.append(nf)
+				batchAppend(nf, snap)
 				changes++
 			}
 		}
@@ -523,7 +524,7 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 				for _, file := range toIgnore {
 					l.Debugln("marking file as ignored", file)
 					nf := file.ConvertToIgnoredFileInfo(f.shortID)
-					batch.append(nf)
+					batchAppend(nf, snap)
 					changes++
 					if err := batch.flushIfFull(); err != nil {
 						iterError = err
@@ -550,7 +551,7 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 
 				l.Debugln("marking file as ignored", file)
 				nf := file.ConvertToIgnoredFileInfo(f.shortID)
-				batch.append(nf)
+				batchAppend(nf, snap)
 				changes++
 
 			case file.IsIgnored() && !ignored:
@@ -579,7 +580,7 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 					nf.Version = protocol.Vector{}
 				}
 
-				batch.append(nf)
+				batchAppend(nf, snap)
 				changes++
 			}
 
@@ -593,7 +594,7 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 			nf := fi.(db.FileInfoTruncated).ConvertDeletedToFileInfo()
 			nf.LocalFlags = 0
 			nf.Version = protocol.Vector{}
-			batch.append(nf)
+			batchAppend(nf, snap)
 			changes++
 
 			return true
@@ -609,7 +610,7 @@ func (f *folder) scanSubdirs(subDirs []string) error {
 			for _, file := range toIgnore {
 				l.Debugln("marking file as ignored", f)
 				nf := file.ConvertToIgnoredFileInfo(f.shortID)
-				batch.append(nf)
+				batchAppend(nf, snap)
 				changes++
 				if iterError = batch.flushIfFull(); iterError != nil {
 					break