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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfsutil
import (
"context"
"errors"
"fmt"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
"git.lukeshu.com/btrfs-progs-ng/lib/slices"
"git.lukeshu.com/btrfs-progs-ng/lib/util"
)
// ScanForNodes mimics btrfs-progs
// cmds/rescue-chunk-recover.c:scan_one_device(), except rather than
// doing something itself when it finds a node, it simply calls a
// callback function.
func ScanForNodes(ctx context.Context, dev *btrfs.Device, sb btrfs.Superblock, fn func(*util.Ref[btrfsvol.PhysicalAddr, btrfs.Node], error), prog func(btrfsvol.PhysicalAddr)) error {
devSize, err := dev.Size()
if err != nil {
return err
}
if sb.NodeSize < sb.SectorSize {
return fmt.Errorf("node_size(%v) < sector_size(%v)",
sb.NodeSize, sb.SectorSize)
}
for pos := btrfsvol.PhysicalAddr(0); pos+btrfsvol.PhysicalAddr(sb.NodeSize) < devSize; pos += btrfsvol.PhysicalAddr(sb.SectorSize) {
if ctx.Err() != nil {
return ctx.Err()
}
if slices.Contains(pos, btrfs.SuperblockAddrs) {
//fmt.Printf("sector@%v is a superblock\n", pos)
continue
}
if prog != nil {
prog(pos)
}
nodeRef, err := btrfs.ReadNode[btrfsvol.PhysicalAddr](dev, sb, pos, nil)
if err != nil && errors.Is(err, btrfs.ErrNotANode) {
continue
}
fn(nodeRef, err)
pos += btrfsvol.PhysicalAddr(sb.NodeSize) - btrfsvol.PhysicalAddr(sb.SectorSize)
}
if prog != nil {
prog(devSize)
}
return nil
}
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