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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package rebuildmappings
import (
"context"
"encoding/gob"
"io"
"math"
"os"
"runtime"
"strings"
"sync"
"github.com/datawire/dlib/dgroup"
"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/btrfssum"
"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"
)
type AllSums struct {
Logical []btrfsinspect.SumRun[btrfsvol.LogicalAddr]
Physical map[btrfsvol.DeviceID]btrfsinspect.SumRun[btrfsvol.PhysicalAddr]
}
func (as AllSums) SumForPAddr(paddr btrfsvol.QualifiedPhysicalAddr) (btrfsinspect.ShortSum, bool) {
run, ok := as.Physical[paddr.Dev]
if !ok {
return "", false
}
return run.SumForAddr(paddr.Addr)
}
func (as AllSums) RunForLAddr(laddr btrfsvol.LogicalAddr) (btrfsinspect.SumRun[btrfsvol.LogicalAddr], btrfsvol.LogicalAddr, bool) {
for _, run := range as.Logical {
if run.Addr > laddr {
return btrfsinspect.SumRun[btrfsvol.LogicalAddr]{}, run.Addr, false
}
if run.Addr.Add(run.Size()) <= laddr {
continue
}
return run, 0, true
}
return btrfsinspect.SumRun[btrfsvol.LogicalAddr]{}, math.MaxInt64, false
}
func (as AllSums) SumForLAddr(laddr btrfsvol.LogicalAddr) (btrfsinspect.ShortSum, bool) {
run, _, ok := as.RunForLAddr(laddr)
if !ok {
return "", false
}
return run.SumForAddr(laddr)
}
func (as AllSums) WalkLogical(ctx context.Context, fn func(btrfsvol.LogicalAddr, btrfsinspect.ShortSum) error) error {
for _, run := range as.Logical {
if err := run.Walk(ctx, fn); err != nil {
return err
}
}
return nil
}
// Read/Write AllSums ////////////////////////////////////////////////
func ReadAllSums(filename string) (AllSums, error) {
fh, err := os.Open(filename)
if err != nil {
return AllSums{}, err
}
defer fh.Close()
var val AllSums
if err := gob.NewDecoder(fh).Decode(&val); err != nil {
return AllSums{}, err
}
return val, nil
}
func WriteAllSums(w io.Writer, sums AllSums) error {
return gob.NewEncoder(w).Encode(sums)
}
func SumEverything(ctx context.Context, fs *btrfs.FS) (AllSums, error) {
var ret AllSums
// ChecksumSize
var alg btrfssum.CSumType
var csumSize int
if err := func() error {
sb, err := fs.Superblock()
if err != nil {
return err
}
alg = sb.ChecksumType
csumSize = alg.Size()
return nil
}(); err != nil {
return ret, err
}
// Logical
dlog.Info(ctx, "Walking CSUM_TREE...")
func() {
var curAddr btrfsvol.LogicalAddr
var curSums strings.Builder
btrfsutil.NewBrokenTrees(ctx, fs).TreeWalk(ctx, btrfs.CSUM_TREE_OBJECTID,
func(err *btrfs.TreeError) {
dlog.Error(ctx, err)
},
btrfs.TreeWalkHandler{
Item: func(path btrfs.TreePath, item btrfs.Item) error {
if item.Key.ItemType != btrfsitem.EXTENT_CSUM_KEY {
return nil
}
body := item.Body.(btrfsitem.ExtentCSum)
for i, sum := range body.Sums {
laddr := btrfsvol.LogicalAddr(item.Key.Offset) + (btrfsvol.LogicalAddr(i) * btrfsitem.CSumBlockSize)
if laddr != curAddr+(btrfsvol.LogicalAddr(curSums.Len()/csumSize)*btrfsitem.CSumBlockSize) {
if curSums.Len() > 0 {
ret.Logical = append(ret.Logical, btrfsinspect.SumRun[btrfsvol.LogicalAddr]{
ChecksumSize: csumSize,
Addr: curAddr,
Sums: curSums.String(),
})
}
curAddr = laddr
curSums.Reset()
}
curSums.Write(sum[:csumSize])
}
return nil
},
},
)
if curSums.Len() > 0 {
ret.Logical = append(ret.Logical, btrfsinspect.SumRun[btrfsvol.LogicalAddr]{
ChecksumSize: csumSize,
Addr: curAddr,
Sums: curSums.String(),
})
}
}()
if err := ctx.Err(); err != nil {
return ret, err
}
dlog.Info(ctx, "... done walking")
runtime.GC()
dlog.Info(ctx, "... GC'd")
// Physical
dlog.Info(ctx, "Summing devices...")
if err := func() error {
devs := fs.LV.PhysicalVolumes()
var mu sync.Mutex
ret.Physical = make(map[btrfsvol.DeviceID]btrfsinspect.SumRun[btrfsvol.PhysicalAddr], len(devs))
grp := dgroup.NewGroup(ctx, dgroup.GroupConfig{})
for devID, dev := range devs {
devID, dev := devID, dev
grp.Go(dev.Name(), func(ctx context.Context) error {
devSize := dev.Size()
numSums := int(devSize / btrfsitem.CSumBlockSize)
sums := make([]byte, numSums*csumSize)
lastPct := -1
progress := func(curSum int) {
pct := int(100 * float64(curSum) / float64(numSums))
if pct != lastPct || curSum == numSums {
dlog.Infof(ctx, "... dev[%q] summed %v%%",
dev.Name(), pct)
lastPct = pct
}
}
for i := 0; i < numSums; i++ {
if err := ctx.Err(); err != nil {
return err
}
progress(i)
sum, err := btrfsutil.ChecksumPhysical(dev, alg, btrfsvol.PhysicalAddr(i*btrfsitem.CSumBlockSize))
if err != nil {
return err
}
copy(sums[i*csumSize:], sum[:csumSize])
}
progress(numSums)
sumsStr := string(sums)
mu.Lock()
ret.Physical[devID] = btrfsinspect.SumRun[btrfsvol.PhysicalAddr]{
ChecksumSize: csumSize,
Addr: 0,
Sums: sumsStr,
}
mu.Unlock()
return nil
})
}
return grp.Wait()
}(); err != nil {
return ret, err
}
dlog.Info(ctx, "... done summing devices")
runtime.GC()
dlog.Info(ctx, "... GC'd")
// Return
return ret, nil
}
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