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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfsutil
import (
"context"
"fmt"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
"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"
)
type WalkAllTreesHandler struct {
PreTree func(name string, id btrfsprim.ObjID)
BadTree func(name string, id btrfsprim.ObjID, err error)
Tree btrfstree.TreeWalkHandler
PostTree func(name string, id btrfsprim.ObjID)
}
// WalkAllTrees walks all trees in a btrfs.ReadableFS. Rather than
// returning an error, it calls the appropriate "BadXXX" callback
// (BadTree, BadNode, BadItem) each time an error is encountered.
func WalkAllTrees(ctx context.Context, fs btrfs.ReadableFS, cbs WalkAllTreesHandler) {
var treeName string
trees := []struct {
Name string
ID btrfsprim.ObjID
}{
{
Name: "root tree",
ID: btrfsprim.ROOT_TREE_OBJECTID,
},
{
Name: "chunk tree",
ID: btrfsprim.CHUNK_TREE_OBJECTID,
},
{
Name: "log tree",
ID: btrfsprim.TREE_LOG_OBJECTID,
},
{
Name: "block group tree",
ID: btrfsprim.BLOCK_GROUP_TREE_OBJECTID,
},
}
origItem := cbs.Tree.Item
cbs.Tree.Item = func(path btrfstree.Path, item btrfstree.Item) {
if item.Key.ItemType == btrfsitem.ROOT_ITEM_KEY {
trees = append(trees, struct {
Name string
ID btrfsprim.ObjID
}{
Name: fmt.Sprintf("tree %v (via %v %v)",
item.Key.ObjectID.Format(0), treeName, path),
ID: item.Key.ObjectID,
})
}
if origItem != nil {
origItem(path, item)
}
}
for i := 0; i < len(trees); i++ {
treeInfo := trees[i]
treeName = treeInfo.Name
if cbs.PreTree != nil {
cbs.PreTree(treeName, treeInfo.ID)
}
tree, err := fs.ForrestLookup(ctx, treeInfo.ID)
switch {
case err != nil:
if cbs.BadTree != nil {
cbs.BadTree(treeName, treeInfo.ID, err)
}
default:
tree.TreeWalk(ctx, cbs.Tree)
}
if cbs.PostTree != nil {
cbs.PostTree(treeName, treeInfo.ID)
}
}
}
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