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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfsinspect
import (
"context"
"sort"
"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/btrfsvol"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsutil"
"git.lukeshu.com/btrfs-progs-ng/lib/containers"
"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
"git.lukeshu.com/btrfs-progs-ng/lib/maps"
)
type ScanOneDevResult struct {
FoundNodes map[btrfsvol.LogicalAddr][]btrfsvol.PhysicalAddr
FoundChunks []btrfs.SysChunk
FoundBlockGroups []SysBlockGroup
FoundDevExtents []SysDevExtent
}
type SysBlockGroup struct {
Key btrfs.Key
BG btrfsitem.BlockGroup
}
type SysDevExtent struct {
Key btrfs.Key
DevExt btrfsitem.DevExtent
}
func (found ScanOneDevResult) AddToLV(ctx context.Context, fs *btrfs.FS, dev *btrfs.Device) {
sb, _ := dev.Superblock()
total := len(found.FoundChunks) + len(found.FoundDevExtents)
for _, paddrs := range found.FoundNodes {
total += len(paddrs)
}
lastProgress := -1
done := 0
printProgress := func() {
pct := int(100 * float64(done) / float64(total))
if pct != lastProgress || done == total {
dlog.Infof(ctx, "... dev[%q] added %v%% of the mappings (%v/%v=>%v)",
dev.Name(), pct, done, total, len(fs.LV.Mappings()))
lastProgress = pct
}
}
printProgress()
for _, chunk := range found.FoundChunks {
for _, mapping := range chunk.Chunk.Mappings(chunk.Key) {
if err := fs.LV.AddMapping(mapping); err != nil {
dlog.Errorf(ctx, "... dev[%q] error: adding chunk: %v",
dev.Name(), err)
}
done++
printProgress()
}
}
for _, ext := range found.FoundDevExtents {
if err := fs.LV.AddMapping(ext.DevExt.Mapping(ext.Key)); err != nil {
dlog.Errorf(ctx, "... dev[%q] error: adding devext: %v",
dev.Name(), err)
}
done++
printProgress()
}
// Do the nodes last to avoid bloating the mappings table too
// much. (Because nodes are numerous and small, while the
// others are few and large; so it is likely that many of the
// nodes will be subsumed by other things.)
//
// Sort them so that progress numbers are predictable.
for _, laddr := range maps.SortedKeys(found.FoundNodes) {
for _, paddr := range found.FoundNodes[laddr] {
if err := fs.LV.AddMapping(btrfsvol.Mapping{
LAddr: laddr,
PAddr: btrfsvol.QualifiedPhysicalAddr{
Dev: sb.DevItem.DevID,
Addr: paddr,
},
Size: btrfsvol.AddrDelta(sb.NodeSize),
SizeLocked: false,
}); err != nil {
dlog.Errorf(ctx, "... dev[%q] error: adding node ident: %v",
dev.Name(), err)
}
done++
printProgress()
}
}
// Use block groups to add missing flags (and as a hint to
// combine node entries).
//
// First dedup them, because they change for allocations and
// CoW means that they'll bounce around a lot, so you likely
// have oodles of duplicates?
type blockgroup struct {
LAddr btrfsvol.LogicalAddr
Size btrfsvol.AddrDelta
Flags btrfsvol.BlockGroupFlags
}
bgsSet := make(map[blockgroup]struct{})
for _, bg := range found.FoundBlockGroups {
bgsSet[blockgroup{
LAddr: btrfsvol.LogicalAddr(bg.Key.ObjectID),
Size: btrfsvol.AddrDelta(bg.Key.Offset),
Flags: bg.BG.Flags,
}] = struct{}{}
}
bgsOrdered := maps.Keys(bgsSet)
sort.Slice(bgsOrdered, func(i, j int) bool {
return bgsOrdered[i].LAddr < bgsOrdered[j].LAddr
})
for _, bg := range bgsOrdered {
otherLAddr, otherPAddr := fs.LV.ResolveAny(bg.LAddr, bg.Size)
if otherLAddr < 0 || otherPAddr.Addr < 0 {
dlog.Errorf(ctx, "... dev[%q] error: could not pair blockgroup laddr=%v (size=%v flags=%v) with a mapping",
dev.Name(), bg.LAddr, bg.Size, bg.Flags)
continue
}
offsetWithinChunk := otherLAddr.Sub(bg.LAddr)
mapping := btrfsvol.Mapping{
LAddr: bg.LAddr,
PAddr: otherPAddr.Add(-offsetWithinChunk),
Size: bg.Size,
SizeLocked: true,
Flags: containers.Optional[btrfsvol.BlockGroupFlags]{
OK: true,
Val: bg.Flags,
},
}
if err := fs.LV.AddMapping(mapping); err != nil {
dlog.Errorf(ctx, "... dev[%q] error: adding flags from blockgroup: %v",
dev.Name(), err)
}
}
}
// ScanOneDev mostly mimics btrfs-progs
// cmds/rescue-chunk-recover.c:scan_one_device().
func ScanOneDev(ctx context.Context, dev *btrfs.Device, superblock btrfs.Superblock) (ScanOneDevResult, error) {
result := ScanOneDevResult{
FoundNodes: make(map[btrfsvol.LogicalAddr][]btrfsvol.PhysicalAddr),
}
devSize := dev.Size()
lastProgress := -1
err := btrfsutil.ScanForNodes(ctx, dev, superblock, func(nodeRef *diskio.Ref[btrfsvol.PhysicalAddr, btrfs.Node], err error) {
if err != nil {
dlog.Infof(ctx, "... dev[%q] error: %v", dev.Name(), err)
return
}
result.FoundNodes[nodeRef.Data.Head.Addr] = append(result.FoundNodes[nodeRef.Data.Head.Addr], nodeRef.Addr)
for i, item := range nodeRef.Data.BodyLeaf {
switch item.Key.ItemType {
case btrfsitem.CHUNK_ITEM_KEY:
chunk, ok := item.Body.(btrfsitem.Chunk)
if !ok {
dlog.Errorf(ctx, "... dev[%q] node@%v: item %v: error: type is CHUNK_ITEM_KEY, but struct is %T",
dev.Name(), nodeRef.Addr, i, item.Body)
continue
}
//dlog.Tracef(ctx, "... dev[%q] node@%v: item %v: found chunk",
// dev.Name(), nodeRef.Addr, i)
result.FoundChunks = append(result.FoundChunks, btrfs.SysChunk{
Key: item.Key,
Chunk: chunk,
})
case btrfsitem.BLOCK_GROUP_ITEM_KEY:
bg, ok := item.Body.(btrfsitem.BlockGroup)
if !ok {
dlog.Errorf(ctx, "... dev[%q] node@%v: item %v: error: type is BLOCK_GROUP_ITEM_KEY, but struct is %T",
dev.Name(), nodeRef.Addr, i, item.Body)
continue
}
//dlog.Tracef(ctx, "... dev[%q] node@%v: item %v: found block group",
// dev.Name(), nodeRef.Addr, i)
result.FoundBlockGroups = append(result.FoundBlockGroups, SysBlockGroup{
Key: item.Key,
BG: bg,
})
case btrfsitem.DEV_EXTENT_KEY:
devext, ok := item.Body.(btrfsitem.DevExtent)
if !ok {
dlog.Errorf(ctx, "... dev[%q] node@%v: item %v: error: type is DEV_EXTENT_KEY, but struct is %T",
dev.Name(), nodeRef.Addr, i, item.Body)
continue
}
//dlog.Tracef(ctx, "... dev[%q] node@%v: item %v: found dev extent",
// dev.Name(), nodeRef.Addr, i)
result.FoundDevExtents = append(result.FoundDevExtents, SysDevExtent{
Key: item.Key,
DevExt: devext,
})
}
}
}, func(pos btrfsvol.PhysicalAddr) {
pct := int(100 * float64(pos) / float64(devSize))
if pct != lastProgress || pos == devSize {
dlog.Infof(ctx, "... dev[%q] scanned %v%% (found: %v nodes, %v chunks, %v block groups, %v dev extents)",
dev.Name(), pct,
len(result.FoundNodes),
len(result.FoundChunks),
len(result.FoundBlockGroups),
len(result.FoundDevExtents))
lastProgress = pct
}
})
return result, err
}
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