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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfsinspect
import (
"context"
"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/diskio"
)
type ScanOneDeviceResult 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
}
// ScanOneDevice mostly mimics btrfs-progs
// cmds/rescue-chunk-recover.c:scan_one_device().
func ScanOneDevice(ctx context.Context, dev *btrfs.Device, superblock btrfs.Superblock) (ScanOneDeviceResult, error) {
result := ScanOneDeviceResult{
FoundNodes: make(map[btrfsvol.LogicalAddr][]btrfsvol.PhysicalAddr),
}
devSize := dev.Size()
lastProgress := -1
err := 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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