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// Copyright (C) 2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package rebuildmappings
import (
"fmt"
"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
"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/diskio"
"git.lukeshu.com/btrfs-progs-ng/lib/slices"
)
type phonyFile struct {
size btrfsvol.PhysicalAddr
sb btrfstree.Superblock
}
var _ diskio.File[btrfsvol.PhysicalAddr] = (*phonyFile)(nil)
func NewPhonyFile(size btrfsvol.PhysicalAddr, sb btrfstree.Superblock) *phonyFile {
return &phonyFile{
size: size,
sb: sb,
}
}
func (f *phonyFile) Name() string { return fmt.Sprintf("phony_file:device_id=%v", f.sb.DevItem.DevID) }
func (f *phonyFile) Size() btrfsvol.PhysicalAddr { return f.size }
func (*phonyFile) Close() error { return nil }
func (f *phonyFile) ReadAt(p []byte, off btrfsvol.PhysicalAddr) (int, error) {
if len(p) == int(btrfs.SuperblockSize) && slices.Contains(off, btrfs.SuperblockAddrs) {
bs, err := binstruct.Marshal(f.sb)
if err != nil {
return 0, err
}
return copy(p, bs), nil
}
panic(fmt.Errorf("%T: should not happen: ReadAt should not be called for a phony file", f))
}
func (f *phonyFile) WriteAt([]byte, btrfsvol.PhysicalAddr) (int, error) {
panic(fmt.Errorf("%T: should not happen: WriteAt should not be called for a phony file", f))
}
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