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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package rebuildtrees
import (
"context"
"fmt"
"time"
"github.com/datawire/dlib/dlog"
"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"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsutil"
"git.lukeshu.com/btrfs-progs-ng/lib/containers"
"git.lukeshu.com/btrfs-progs-ng/lib/textui"
)
type SizeAndErr struct {
Size uint64
Err error
}
type FlagsAndErr struct {
NoDataSum bool
Err error
}
// ExtentDataRefPtr is a pointer to a *btrfsitem.ExtentDataRef,
// whether it be to an EXTENT_DATA_REF item proper, or to an inline
// ref inside of another EXTENT_ITEM or METADATA_ITEM.
type ExtentDataRefPtr struct {
btrfsutil.ItemPtr
RefNum int // Only for EXTENT_ITEM and METADATA_ITEM
}
type ScanDevicesResult struct {
Graph btrfsutil.Graph
Flags map[btrfsutil.ItemPtr]FlagsAndErr // INODE_ITEM
Names map[btrfsutil.ItemPtr][]byte // DIR_INDEX
Sizes map[btrfsutil.ItemPtr]SizeAndErr // EXTENT_CSUM and EXTENT_DATA
DataBackrefs map[btrfsutil.ItemPtr][]btrfsprim.ObjID // EXTENT_DATA_REF, EXTENT_ITEM, and METADATA_ITEM
}
func ScanDevices(_ctx context.Context, fs *btrfs.FS, nodeList []btrfsvol.LogicalAddr) (ScanDevicesResult, error) {
// read-superblock /////////////////////////////////////////////////////////////
ctx := dlog.WithField(_ctx, "btrfs.inspect.rebuild-trees.read.substep", "read-superblock")
dlog.Info(ctx, "Reading superblock...")
sb, err := fs.Superblock()
if err != nil {
return ScanDevicesResult{}, err
}
// read-roots //////////////////////////////////////////////////////////////////
ctx = dlog.WithField(_ctx, "btrfs.inspect.rebuild-trees.read.substep", "read-roots")
ret := ScanDevicesResult{
Graph: btrfsutil.NewGraph(ctx, *sb),
Flags: make(map[btrfsutil.ItemPtr]FlagsAndErr),
Names: make(map[btrfsutil.ItemPtr][]byte),
Sizes: make(map[btrfsutil.ItemPtr]SizeAndErr),
DataBackrefs: make(map[btrfsutil.ItemPtr][]btrfsprim.ObjID),
}
// read-nodes //////////////////////////////////////////////////////////////////
ctx = dlog.WithField(_ctx, "btrfs.inspect.rebuild-trees.read.substep", "read-nodes")
dlog.Infof(ctx, "Reading node data from FS...")
var stats textui.Portion[int]
stats.D = len(nodeList)
progressWriter := textui.NewProgress[textui.Portion[int]](
ctx,
dlog.LogLevelInfo,
textui.Tunable(1*time.Second))
progressWriter.Set(stats)
for _, laddr := range nodeList {
if err := ctx.Err(); err != nil {
progressWriter.Done()
return ScanDevicesResult{}, err
}
node, err := fs.AcquireNode(ctx, laddr, btrfstree.NodeExpectations{
LAddr: containers.OptionalValue(laddr),
})
if err != nil {
fs.ReleaseNode(node)
progressWriter.Done()
return ScanDevicesResult{}, err
}
ret.insertNode(node)
fs.ReleaseNode(node)
stats.N++
progressWriter.Set(stats)
}
if stats.N != stats.D {
panic("should not happen")
}
progressWriter.Done()
dlog.Info(ctx, "... done reading node data")
// check ///////////////////////////////////////////////////////////////////////
ctx = dlog.WithField(_ctx, "btrfs.inspect.rebuild-trees.read.substep", "check")
if err := ret.Graph.FinalCheck(ctx, fs); err != nil {
return ScanDevicesResult{}, err
}
return ret, nil
}
func (o *ScanDevicesResult) insertNode(node *btrfstree.Node) {
o.Graph.InsertNode(node)
for i, item := range node.BodyLeaf {
ptr := btrfsutil.ItemPtr{
Node: node.Head.Addr,
Slot: i,
}
switch itemBody := item.Body.(type) {
case *btrfsitem.Inode:
o.Flags[ptr] = FlagsAndErr{
NoDataSum: itemBody.Flags.Has(btrfsitem.INODE_NODATASUM),
Err: nil,
}
case *btrfsitem.DirEntry:
if item.Key.ItemType == btrfsprim.DIR_INDEX_KEY {
o.Names[ptr] = append([]byte(nil), itemBody.Name...)
}
case *btrfsitem.ExtentCSum:
o.Sizes[ptr] = SizeAndErr{
Size: uint64(itemBody.Size()),
Err: nil,
}
case *btrfsitem.FileExtent:
size, err := itemBody.Size()
o.Sizes[ptr] = SizeAndErr{
Size: uint64(size),
Err: err,
}
case *btrfsitem.Extent:
o.DataBackrefs[ptr] = make([]btrfsprim.ObjID, len(itemBody.Refs))
for i, ref := range itemBody.Refs {
if refBody, ok := ref.Body.(*btrfsitem.ExtentDataRef); ok {
o.DataBackrefs[ptr][i] = refBody.Root
}
}
case *btrfsitem.Metadata:
o.DataBackrefs[ptr] = make([]btrfsprim.ObjID, len(itemBody.Refs))
for i, ref := range itemBody.Refs {
if refBody, ok := ref.Body.(*btrfsitem.ExtentDataRef); ok {
o.DataBackrefs[ptr][i] = refBody.Root
}
}
case *btrfsitem.ExtentDataRef:
o.DataBackrefs[ptr] = []btrfsprim.ObjID{itemBody.Root}
case *btrfsitem.Error:
switch item.Key.ItemType {
case btrfsprim.INODE_ITEM_KEY:
o.Flags[ptr] = FlagsAndErr{
Err: fmt.Errorf("error decoding item: ptr=%v (tree=%v key=%v): %w",
ptr, node.Head.Owner, item.Key, itemBody.Err),
}
case btrfsprim.EXTENT_CSUM_KEY, btrfsprim.EXTENT_DATA_KEY:
o.Sizes[ptr] = SizeAndErr{
Err: fmt.Errorf("error decoding item: ptr=%v (tree=%v key=%v): %w",
ptr, node.Head.Owner, item.Key, itemBody.Err),
}
}
}
}
}
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