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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package rebuildmappings
import (
"fmt"
"sort"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
"git.lukeshu.com/btrfs-progs-ng/lib/containers"
"git.lukeshu.com/btrfs-progs-ng/lib/maps"
)
type blockGroup struct {
LAddr btrfsvol.LogicalAddr
Size btrfsvol.AddrDelta
Flags btrfsvol.BlockGroupFlags
}
func dedupedBlockGroups(scanResults ScanDevicesResult) (map[btrfsvol.LogicalAddr]blockGroup, error) {
// Dedup
bgsSet := make(containers.Set[blockGroup])
for _, devResults := range scanResults {
for _, bg := range devResults.FoundBlockGroups {
bgsSet.Insert(blockGroup{
LAddr: btrfsvol.LogicalAddr(bg.Key.ObjectID),
Size: btrfsvol.AddrDelta(bg.Key.Offset),
Flags: bg.BG.Flags,
})
}
}
// Sort
bgsOrdered := maps.Keys(bgsSet)
sort.Slice(bgsOrdered, func(i, j int) bool {
return bgsOrdered[i].LAddr < bgsOrdered[j].LAddr
})
// Sanity check
var pos btrfsvol.LogicalAddr
for _, bg := range bgsOrdered {
if bg.LAddr < pos || bg.Size < 0 {
return nil, fmt.Errorf("found block groups are inconsistent")
}
pos = bg.LAddr.Add(bg.Size)
}
// Return. We return a map instead of a slice in order to
// facilitate easy deletes.
bgsMap := make(map[btrfsvol.LogicalAddr]blockGroup, len(bgsSet))
for bg := range bgsSet {
bgsMap[bg.LAddr] = bg
}
return bgsMap, nil
}
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