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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package scanforextents
import (
"context"
"sort"
"golang.org/x/exp/constraints"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
"git.lukeshu.com/btrfs-progs-ng/lib/maps"
)
type PhysicalGap struct {
Beg, End btrfsvol.PhysicalAddr
}
func ListPhysicalGaps(fs *btrfs.FS) map[btrfsvol.DeviceID][]PhysicalGap {
gaps := make(map[btrfsvol.DeviceID][]PhysicalGap)
pos := make(map[btrfsvol.DeviceID]btrfsvol.PhysicalAddr)
mappings := fs.LV.Mappings()
sort.Slice(mappings, func(i, j int) bool {
return mappings[i].PAddr.Cmp(mappings[j].PAddr) < 0
})
for _, mapping := range mappings {
if pos[mapping.PAddr.Dev] < mapping.PAddr.Addr {
gaps[mapping.PAddr.Dev] = append(gaps[mapping.PAddr.Dev], PhysicalGap{
Beg: pos[mapping.PAddr.Dev],
End: mapping.PAddr.Addr,
})
}
if pos[mapping.PAddr.Dev] < mapping.PAddr.Addr.Add(mapping.Size) {
pos[mapping.PAddr.Dev] = mapping.PAddr.Addr.Add(mapping.Size)
}
}
for devID, dev := range fs.LV.PhysicalVolumes() {
devSize := dev.Size()
if pos[devID] < devSize {
gaps[devID] = append(gaps[devID], PhysicalGap{
Beg: pos[devID],
End: devSize,
})
}
}
return gaps
}
func roundUp[T constraints.Integer](x, multiple T) T {
return ((x + multiple - 1) / multiple) * multiple
}
func WalkGaps(ctx context.Context,
sums AllSums, gaps map[btrfsvol.DeviceID][]PhysicalGap,
fn func(btrfsvol.DeviceID, SumRun[btrfsvol.PhysicalAddr]) error,
) error {
for _, devID := range maps.SortedKeys(gaps) {
for _, gap := range gaps[devID] {
if err := ctx.Err(); err != nil {
return err
}
begAddr := roundUp(gap.Beg, CSumBlockSize)
begOff := int(begAddr/CSumBlockSize) * sums.Physical[devID].ChecksumSize
endOff := int(gap.End/CSumBlockSize) * sums.Physical[devID].ChecksumSize
if err := fn(devID, SumRun[btrfsvol.PhysicalAddr]{
ChecksumSize: sums.Physical[devID].ChecksumSize,
Addr: begAddr,
Sums: sums.Physical[devID].Sums[begOff:endOff],
}); err != nil {
return err
}
}
}
return nil
}
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