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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package keyio
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/btrfsprogs/btrfsinspect/rebuildnodes/graph"
"git.lukeshu.com/btrfs-progs-ng/lib/containers"
"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
)
type ItemPtr struct {
Node btrfsvol.LogicalAddr
Idx int
}
func (ptr ItemPtr) String() string {
return fmt.Sprintf("node@%v[%v]", ptr.Node, ptr.Idx)
}
type Handle struct {
rawFile diskio.File[btrfsvol.LogicalAddr]
sb btrfstree.Superblock
graph graph.Graph
cache *containers.LRUCache[btrfsvol.LogicalAddr, *diskio.Ref[btrfsvol.LogicalAddr, btrfstree.Node]]
}
func NewHandle(file diskio.File[btrfsvol.LogicalAddr], sb btrfstree.Superblock, graph graph.Graph) *Handle {
return &Handle{
rawFile: file,
sb: sb,
graph: graph,
cache: containers.NewLRUCache[btrfsvol.LogicalAddr, *diskio.Ref[btrfsvol.LogicalAddr, btrfstree.Node]](8),
}
}
func (o *Handle) ReadNode(laddr btrfsvol.LogicalAddr) *diskio.Ref[btrfsvol.LogicalAddr, btrfstree.Node] {
if cached, ok := o.cache.Get(laddr); ok {
return cached
}
graphInfo, ok := o.graph.Nodes[laddr]
if !ok {
panic(fmt.Errorf("should not happen: node@%v is not mentioned in the in-memory graph", laddr))
}
ref, err := btrfstree.ReadNode(o.rawFile, o.sb, laddr, btrfstree.NodeExpectations{
LAddr: containers.Optional[btrfsvol.LogicalAddr]{OK: true, Val: laddr},
Level: containers.Optional[uint8]{OK: true, Val: graphInfo.Level},
Generation: containers.Optional[btrfsprim.Generation]{OK: true, Val: graphInfo.Generation},
Owner: func(treeID btrfsprim.ObjID) error {
if treeID != graphInfo.Owner {
return fmt.Errorf("expected owner=%v but claims to have owner=%v",
graphInfo.Owner, treeID)
}
return nil
},
MinItem: containers.Optional[btrfsprim.Key]{OK: true, Val: graphInfo.MinItem},
MaxItem: containers.Optional[btrfsprim.Key]{OK: true, Val: graphInfo.MaxItem},
})
if err != nil {
panic(fmt.Errorf("should not happen: i/o error: %w", err))
}
o.cache.Add(laddr, ref)
return ref
}
func (o *Handle) ReadItem(ptr ItemPtr) (item btrfsitem.Item, ok bool) {
if o.graph.Nodes[ptr.Node].Level != 0 || ptr.Idx < 0 {
return nil, false
}
items := o.ReadNode(ptr.Node).Data.BodyLeaf
if ptr.Idx >= len(items) {
return nil, false
}
return items[ptr.Idx].Body, true
}
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