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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package rebuildnodes
import (
"archive/zip"
"context"
"fmt"
"html"
"io"
"strings"
"github.com/datawire/dlib/derror"
"github.com/datawire/dlib/dlog"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsprim"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsinspect"
"git.lukeshu.com/btrfs-progs-ng/lib/containers"
"git.lukeshu.com/btrfs-progs-ng/lib/maps"
)
func getCliques(uuidMap uuidMap, treeAncestors map[btrfsprim.ObjID]containers.Set[btrfsprim.ObjID]) map[btrfsprim.ObjID]*containers.Set[btrfsprim.ObjID] {
cliques := make(map[btrfsprim.ObjID]*containers.Set[btrfsprim.ObjID])
lister := newFullAncestorLister(uuidMap, treeAncestors)
for _, treeID := range maps.SortedKeys(uuidMap.SeenTrees) {
clique := ptrTo(make(containers.Set[btrfsprim.ObjID]))
clique.Insert(treeID)
clique.InsertFrom(lister.GetFullAncestors(treeID))
for _, id := range maps.SortedKeys(*clique) {
if existingClique, ok := cliques[id]; ok {
clique.InsertFrom(*existingClique)
}
cliques[id] = clique
}
}
return cliques
}
func getCliqueID(cliques map[btrfsprim.ObjID]*containers.Set[btrfsprim.ObjID], treeID btrfsprim.ObjID) btrfsprim.ObjID {
clique, ok := cliques[treeID]
if !ok {
panic(fmt.Errorf("tree ID %v was not in .SeenTrees", treeID))
}
return maps.SortedKeys(*clique)[0]
}
func VisualizeNodes(ctx context.Context, out io.Writer, fs *btrfs.FS, nodeScanResults btrfsinspect.ScanDevicesResult) error {
scanData, err := ScanDevices(ctx, fs, nodeScanResults)
if err != nil {
return err
}
dlog.Info(ctx, "Walking trees to rebuild root items...")
treeAncestors := getTreeAncestors(*scanData)
scanData.considerAncestors(ctx, treeAncestors)
////////////////////////////////////////////////////////////////////////////////////////////
cliques := getCliques(scanData.uuidMap, treeAncestors)
dlog.Info(ctx, "Building graphviz graph...")
type graph struct {
nodes map[btrfsprim.ObjID]containers.Set[string] // keyed by treeID
badNodes containers.Set[string]
edges containers.Set[string]
}
graphs := make(map[btrfsprim.ObjID]graph) // keyed by cliqueID
for _, laddr := range maps.SortedKeys(scanData.Nodes) {
nodeData := scanData.Nodes[laddr]
cliqueID := getCliqueID(cliques, nodeData.Owner)
graph, ok := graphs[cliqueID]
if !ok {
graph.nodes = make(map[btrfsprim.ObjID]containers.Set[string])
graph.badNodes = make(containers.Set[string])
graph.edges = make(containers.Set[string])
}
if graph.nodes[nodeData.Owner] == nil {
graph.nodes[nodeData.Owner] = make(containers.Set[string])
}
var buf strings.Builder
fmt.Fprintf(&buf, `n%d [shape=record label="%v\ngen=%v\nlvl=%v|{`,
laddr,
laddr,
nodeData.Generation,
nodeData.Level)
if nodeData.NumItems == 0 {
buf.WriteString("(no items)")
} else {
for i := uint32(0); i < nodeData.NumItems; i++ {
if i == 0 {
fmt.Fprintf(&buf, "<p%[1]d>%[1]d", i)
} else {
fmt.Fprintf(&buf, "|<p%[1]d>%[1]d", i)
}
}
}
buf.WriteString(`}"]`)
graph.nodes[nodeData.Owner].Insert(buf.String())
if len(scanData.EdgesTo[laddr]) == 0 {
graph.edges.Insert(fmt.Sprintf("orphanRoot -> n%d", laddr))
}
graphs[cliqueID] = graph
}
for _, laddr := range maps.SortedKeys(scanData.BadNodes) {
cliqueIDs := make(containers.Set[btrfsprim.ObjID])
for _, edge := range scanData.EdgesTo[laddr] {
cliqueIDs.Insert(getCliqueID(cliques, edge.FromTree))
}
if len(cliqueIDs) != 1 {
dlog.Errorf(ctx, "couldn't assign bad node@%v to a clique: %v", laddr, maps.SortedKeys(cliqueIDs))
continue
}
cliqueID := cliqueIDs.TakeOne()
graph := graphs[cliqueID]
graph.badNodes.Insert(fmt.Sprintf(`n%d [shape=star color=red label="%v"]`, laddr, laddr))
graphs[cliqueID] = graph
}
for _, laddr := range maps.SortedKeys(scanData.EdgesFrom) {
for _, kp := range scanData.EdgesFrom[laddr] {
cliqueID := getCliqueID(cliques, kp.FromTree)
graph := graphs[cliqueID]
var buf strings.Builder
if kp.FromNode == 0 {
graph.nodes[kp.FromTree].Insert(fmt.Sprintf(`t%d [label="%s"]`, kp.FromTree, html.EscapeString(kp.FromTree.String())))
fmt.Fprintf(&buf, "t%d", kp.FromTree)
} else {
fmt.Fprintf(&buf, "n%d", kp.FromNode)
}
fmt.Fprintf(&buf, ` -> n%d [label="%d: key=(%d,%v,%d) gen=%v`,
// dst node
kp.ToNode,
// label
kp.FromItem,
kp.ToKey.ObjectID,
kp.ToKey.ItemType,
kp.ToKey.Offset,
kp.ToGeneration)
toNode, ok := scanData.Nodes[kp.ToNode]
var err error
if !ok {
err = scanData.BadNodes[kp.ToNode]
} else {
var errs derror.MultiError
if toNode.Level != kp.ToLevel {
errs = append(errs, fmt.Errorf("node.level=%v != kp.level=%v",
toNode.Level, kp.ToLevel))
}
if toNode.Generation != kp.ToGeneration {
errs = append(errs, fmt.Errorf("node.generation=%v != kp.generation=%v",
toNode.Generation, kp.ToGeneration))
}
if toNode.NumItems == 0 {
errs = append(errs, fmt.Errorf("node.num_items=0"))
} else if toNode.MinItem != kp.ToKey {
errs = append(errs, fmt.Errorf("node.items[0].key=%v != kp.key=%v",
toNode.MinItem, kp.ToKey))
}
if len(errs) > 0 {
err = errs
}
}
if err != nil {
fmt.Fprintf(&buf, `\n\n%s" color=red]`, html.EscapeString(err.Error()))
} else {
buf.WriteString(`"]`)
}
graph.edges.Insert(buf.String())
graphs[cliqueID] = graph
}
}
////////////////////////////////////////////////////////////////////////////////////////////
dlog.Info(ctx, "Writing graphviz output...")
zw := zip.NewWriter(out)
for _, cliqueID := range maps.SortedKeys(graphs) {
if err := func() (err error) {
graph := graphs[cliqueID]
buf, err := zw.Create(fmt.Sprintf("%d.dot", cliqueID))
if err != nil {
return err
}
if _, err := fmt.Fprintf(buf, "strict digraph clique%d {\n", cliqueID); err != nil {
return err
}
for _, treeID := range maps.SortedKeys(graph.nodes) {
nodes := graph.nodes[treeID]
if _, err := fmt.Fprintf(buf, " subgraph cluster_tree%d {\n", treeID); err != nil {
return err
}
for _, node := range maps.SortedKeys(nodes) {
if _, err := fmt.Fprintf(buf, " %s;\n", node); err != nil {
return err
}
}
if _, err := fmt.Fprintln(buf, " }"); err != nil {
return err
}
}
for _, node := range maps.SortedKeys(graph.badNodes) {
if _, err := fmt.Fprintf(buf, " %s;\n", node); err != nil {
return err
}
}
for _, edge := range maps.SortedKeys(graph.edges) {
if _, err := fmt.Fprintf(buf, " %s;\n", edge); err != nil {
return err
}
}
if _, err := fmt.Fprintln(buf, "}"); err != nil {
return err
}
return nil
}(); err != nil {
return err
}
}
if err := zw.Close(); err != nil {
return err
}
dlog.Info(ctx, "... done writing")
return nil
}
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