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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package graph
import (
"fmt"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
"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/containers"
"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
)
type Node struct {
Level uint8
Generation btrfsprim.Generation
Owner btrfsprim.ObjID
NumItems uint32
MinItem btrfsprim.Key
MaxItem btrfsprim.Key
}
type Edge struct {
FromTree btrfsprim.ObjID
FromNode btrfsvol.LogicalAddr
FromItem int
ToNode btrfsvol.LogicalAddr
ToLevel uint8
ToKey btrfsprim.Key
ToGeneration btrfsprim.Generation
}
func (kp Edge) String() string {
return fmt.Sprintf(`{t:%v,n:%v}[%d]->{n:%v,l:%v,g:%v,k:(%d,%v,%d)}`,
kp.FromTree, kp.FromNode, kp.FromItem,
kp.ToNode, kp.ToLevel, kp.ToGeneration,
kp.ToKey.ObjectID,
kp.ToKey.ItemType,
kp.ToKey.Offset)
}
type Graph struct {
Nodes map[btrfsvol.LogicalAddr]Node
BadNodes map[btrfsvol.LogicalAddr]error
EdgesFrom map[btrfsvol.LogicalAddr][]*Edge
EdgesTo map[btrfsvol.LogicalAddr][]*Edge
}
func (g Graph) insertEdge(kp Edge) {
ptr := &kp
if kp.ToNode == 0 {
panic("kp.ToNode should not be zero")
}
g.EdgesFrom[kp.FromNode] = append(g.EdgesFrom[kp.FromNode], ptr)
g.EdgesTo[kp.ToNode] = append(g.EdgesTo[kp.ToNode], ptr)
}
func (g Graph) insertTreeRoot(sb btrfstree.Superblock, treeID btrfsprim.ObjID) {
treeInfo, err := btrfstree.LookupTreeRoot(nil, sb, treeID)
if err != nil {
// This shouldn't ever happen for treeIDs that are
// mentioned directly in the superblock; which are the
// only trees for which we should call
// .insertTreeRoot().
panic(fmt.Errorf("LookupTreeRoot(%v): %w", treeID, err))
}
if treeInfo.RootNode == 0 {
return
}
g.insertEdge(Edge{
FromTree: treeID,
ToNode: treeInfo.RootNode,
ToLevel: treeInfo.Level,
ToGeneration: treeInfo.Generation,
})
}
func New(sb btrfstree.Superblock) *Graph {
g := &Graph{
Nodes: make(map[btrfsvol.LogicalAddr]Node),
BadNodes: make(map[btrfsvol.LogicalAddr]error),
EdgesFrom: make(map[btrfsvol.LogicalAddr][]*Edge),
EdgesTo: make(map[btrfsvol.LogicalAddr][]*Edge),
}
// These 4 trees are mentioned directly in the superblock, so
// they are always seen.
g.insertTreeRoot(sb, btrfsprim.ROOT_TREE_OBJECTID)
g.insertTreeRoot(sb, btrfsprim.CHUNK_TREE_OBJECTID)
g.insertTreeRoot(sb, btrfsprim.TREE_LOG_OBJECTID)
g.insertTreeRoot(sb, btrfsprim.BLOCK_GROUP_TREE_OBJECTID)
return g
}
func (g *Graph) InsertNode(nodeRef *diskio.Ref[btrfsvol.LogicalAddr, btrfstree.Node]) {
for _, item := range nodeRef.Data.BodyLeaf {
switch itemBody := item.Body.(type) {
case btrfsitem.Root:
g.insertEdge(Edge{
FromTree: item.Key.ObjectID,
ToNode: itemBody.ByteNr,
ToLevel: itemBody.Level,
ToGeneration: itemBody.Generation,
})
}
}
g.Nodes[nodeRef.Addr] = Node{
Level: nodeRef.Data.Head.Level,
Generation: nodeRef.Data.Head.Generation,
Owner: nodeRef.Data.Head.Owner,
NumItems: nodeRef.Data.Head.NumItems,
MinItem: discardOK(nodeRef.Data.MinItem()),
MaxItem: discardOK(nodeRef.Data.MaxItem()),
}
for i, kp := range nodeRef.Data.BodyInternal {
g.insertEdge(Edge{
FromTree: nodeRef.Data.Head.Owner,
FromNode: nodeRef.Addr,
FromItem: i,
ToNode: kp.BlockPtr,
ToLevel: nodeRef.Data.Head.Level - 1,
ToKey: kp.Key,
ToGeneration: kp.Generation,
})
}
}
func (g *Graph) FinalCheck(fs diskio.File[btrfsvol.LogicalAddr], sb btrfstree.Superblock, progress func(n, d int)) error {
total := len(g.EdgesTo)
done := 0
progress(done, total)
for laddr := range g.EdgesTo {
if _, ok := g.Nodes[laddr]; !ok {
_, err := btrfstree.ReadNode[btrfsvol.LogicalAddr](fs, sb, laddr, btrfstree.NodeExpectations{
LAddr: containers.Optional[btrfsvol.LogicalAddr]{OK: true, Val: laddr},
})
if err == nil {
return fmt.Errorf("node@%v exists but was not in node scan results", laddr)
}
g.BadNodes[laddr] = err
}
done++
progress(done, total)
}
return nil
}
func discardOK[T any](val T, _ bool) T {
return val
}
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