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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"
"errors"
"fmt"
"html"
"io"
iofs "io/fs"
"strings"
"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/btrfs/btrfstree"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsinspect"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsutil"
"git.lukeshu.com/btrfs-progs-ng/lib/containers"
"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
"git.lukeshu.com/btrfs-progs-ng/lib/maps"
)
func ptrTo[T any](x T) *T {
return &x
}
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 {
uuidMap, err := buildUUIDMap(ctx, fs, nodeScanResults)
if err != nil {
return err
}
nfs := &RebuiltTrees{
inner: fs,
uuidMap: uuidMap,
}
orphanedNodes, _, treeAncestors, err := classifyNodes(ctx, nfs, nodeScanResults)
if err != nil {
return err
}
uuidMap.considerAncestors(ctx, treeAncestors)
////////////////////////////////////////////////////////////////////////////////////////////
cliques := getCliques(uuidMap, treeAncestors)
dlog.Info(ctx, "Building graphviz graph...")
nodes := make(map[btrfsprim.ObjID]containers.Set[string]) // grouped by treeID
edges := make(map[btrfsprim.ObjID]containers.Set[string]) // grouped by cliqueID
visitedNodes := make(containers.Set[btrfsvol.LogicalAddr])
var isOrphan bool
nodeHandler := func(path btrfstree.TreePath, nodeRef *diskio.Ref[btrfsvol.LogicalAddr, btrfstree.Node], err error) error {
addr := path.Node(-1).ToNodeAddr
// Node
var treeID btrfsprim.ObjID
var nodeStr string
if err != nil && (errors.Is(err, btrfstree.ErrNotANode) || errors.As(err, new(*btrfstree.IOError))) {
treeID = 0
nodeStr = fmt.Sprintf(`n%d [shape=star color=red label="%v"]`, addr, addr)
} else {
treeID = nodeRef.Data.Head.Owner
var buf strings.Builder
fmt.Fprintf(&buf, `n%d [shape=record label="%v\ngen=%v\nlvl=%v|{`,
addr,
nodeRef.Data.Head.Addr,
nodeRef.Data.Head.Generation,
nodeRef.Data.Head.Level)
if nodeRef.Data.Head.NumItems == 0 {
buf.WriteString("(no items)")
} else {
for i := uint32(0); i < nodeRef.Data.Head.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(`}"]`)
nodeStr = buf.String()
}
if _, ok := nodes[treeID]; !ok {
nodes[treeID] = make(containers.Set[string])
nodes[treeID].Insert(fmt.Sprintf(`t%d [label="%s"]`, treeID, html.EscapeString(treeID.String())))
}
nodes[treeID].Insert(nodeStr)
// Edge
var edge strings.Builder
if len(path) == 1 {
if isOrphan {
edge.WriteString("orphanRoot")
} else {
fmt.Fprintf(&edge, "t%d", path[0].FromTree)
}
} else {
fmt.Fprintf(&edge, "n%d:p%d", path.Node(-2).ToNodeAddr, path.Node(-1).FromItemIdx)
}
fmt.Fprintf(&edge, ` -> n%d [label="`, addr)
if path.Node(-1).FromItemIdx >= 0 {
fmt.Fprintf(&edge, "%d: key=(%d,%v,%d) gen=%v",
path.Node(-1).FromItemIdx,
path.Node(-1).ToKey.ObjectID,
path.Node(-1).ToKey.ItemType,
path.Node(-1).ToKey.Offset,
path.Node(-1).ToNodeGeneration)
}
if err != nil {
fmt.Fprintf(&edge, `\n\n%s" color=red]`, html.EscapeString(err.Error()))
} else {
edge.WriteString(`"]`)
}
cliqueID := getCliqueID(cliques, path[0].FromTree)
if treeID != 0 && getCliqueID(cliques, treeID) != cliqueID {
panic(fmt.Errorf("tree %v is not in clique %v", treeID, maps.SortedKeys(*cliques[cliqueID])))
}
if !cliques[cliqueID].Has(cliqueID) {
panic(fmt.Errorf("clique %v does not contain supposed-member %v", maps.SortedKeys(*cliques[cliqueID]), cliqueID))
}
if _, ok := edges[cliqueID]; !ok {
edges[cliqueID] = make(containers.Set[string])
}
edges[cliqueID].Insert(edge.String())
// Return
if visitedNodes.Has(addr) {
return iofs.SkipDir
}
visitedNodes.Insert(addr)
return err
}
walkHandler := btrfstree.TreeWalkHandler{
Node: func(path btrfstree.TreePath, nodeRef *diskio.Ref[btrfsvol.LogicalAddr, btrfstree.Node]) error {
return nodeHandler(path, nodeRef, nil)
},
BadNode: func(path btrfstree.TreePath, nodeRef *diskio.Ref[btrfsvol.LogicalAddr, btrfstree.Node], err error) error {
return nodeHandler(path, nodeRef, err)
},
}
btrfsutil.WalkAllTrees(ctx, nfs, btrfsutil.WalkAllTreesHandler{
TreeWalkHandler: walkHandler,
Err: func(err *btrfsutil.WalkError) {
// do nothing
},
})
isOrphan = true
for _, potentialRoot := range maps.SortedKeys(orphanedNodes) {
walkFromNode(ctx, nfs, potentialRoot,
func(err *btrfstree.TreeError) {
// do nothing
},
walkHandler,
)
}
dlog.Info(ctx, "... done building")
////////////////////////////////////////////////////////////////////////////////////////////
dlog.Info(ctx, "Writing graphviz output...")
cliqueIDs := maps.SortedKeys(edges)
zw := zip.NewWriter(out)
for _, cliqueID := range cliqueIDs {
if err := func() (err error) {
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
}
clique := cliques[cliqueID]
for _, treeID := range maps.SortedKeys(*clique) {
if _, err := fmt.Fprintf(buf, " subgraph cluster_tree%d {\n", treeID); err != nil {
return err
}
for _, node := range maps.SortedKeys(nodes[treeID]) {
if _, err := fmt.Fprintf(buf, " %s;\n", node); err != nil {
return err
}
}
if _, err := fmt.Fprintln(buf, " }"); err != nil {
return err
}
}
for _, edge := range maps.SortedKeys(edges[cliqueID]) {
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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