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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package rebuildmappings
import (
"context"
"github.com/datawire/dlib/dlog"
"golang.org/x/text/number"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfssum"
"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"
)
func matchBlockGroupSumsExact(ctx context.Context,
fs *btrfs.FS,
blockgroups map[btrfsvol.LogicalAddr]blockGroup,
physicalSums map[btrfsvol.DeviceID]btrfssum.SumRun[btrfsvol.PhysicalAddr],
logicalSums sumRunWithGaps[btrfsvol.LogicalAddr],
) error {
regions := listUnmappedPhysicalRegions(fs)
numBlockgroups := len(blockgroups)
for i, bgLAddr := range maps.SortedKeys(blockgroups) {
blockgroup := blockgroups[bgLAddr]
bgRun := sumsForLogicalRegion(logicalSums, blockgroup.LAddr, blockgroup.Size)
if len(bgRun.Runs) == 0 {
dlog.Errorf(ctx, "(%v/%v) blockgroup[laddr=%v] can't be matched because it has 0 runs",
i+1, numBlockgroups, bgLAddr)
continue
}
var matches []btrfsvol.QualifiedPhysicalAddr
if err := walkUnmappedPhysicalRegions(ctx, physicalSums, regions, func(devID btrfsvol.DeviceID, region btrfssum.SumRun[btrfsvol.PhysicalAddr]) error {
rawMatches := indexAll[int, btrfssum.ShortSum](region, bgRun)
for _, match := range rawMatches {
matches = append(matches, btrfsvol.QualifiedPhysicalAddr{
Dev: devID,
Addr: region.Addr + (btrfsvol.PhysicalAddr(match) * btrfssum.BlockSize),
})
}
return nil
}); err != nil {
return err
}
lvl := dlog.LogLevelError
if len(matches) == 1 {
lvl = dlog.LogLevelInfo
}
dlog.Logf(ctx, lvl, "(%v/%v) blockgroup[laddr=%v] has %v matches based on %v coverage from %v runs",
i+1, numBlockgroups, bgLAddr, len(matches), number.Percent(bgRun.PctFull()), len(bgRun.Runs))
if len(matches) != 1 {
continue
}
mapping := btrfsvol.Mapping{
LAddr: blockgroup.LAddr,
PAddr: matches[0],
Size: blockgroup.Size,
SizeLocked: true,
Flags: containers.OptionalValue(blockgroup.Flags),
}
if err := fs.LV.AddMapping(mapping); err != nil {
dlog.Errorf(ctx, "error: %v", err)
continue
}
delete(blockgroups, bgLAddr)
}
return nil
}
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