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Add comments to fillersFromRem

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This commit is contained in:
Łukasz Magiera 2019-11-09 00:06:07 +01:00
parent fa67ccb5f3
commit aaacfd15cd
3 changed files with 30 additions and 5 deletions
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2
node/impl/storminer.go
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@ -35,7 +35,7 @@ func (sm *StorageMinerAPI) ActorAddress(context.Context) (address.Address, error
}
func (sm *StorageMinerAPI) StoreGarbageData(ctx context.Context) error {
return sm.Miner.StoreGarbageData(ctx)
return sm.Miner.StoreGarbageData()
}
func (sm *StorageMinerAPI) SectorsStatus(ctx context.Context, sid uint64) (api.SectorInfo, error) {

8
storage/garbage.go
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@ -62,7 +62,6 @@ func (m *Miner) storeGarbage(ctx context.Context, sectorID uint64, existingPiece
return nil, xerrors.Errorf("serializing PublishStorageDeals params failed: ", aerr)
}
// TODO: We may want this to happen after fetching data
smsg, err := m.api.MpoolPushMessage(ctx, &types.Message{
To: actors.StorageMarketAddress,
From: m.worker,
@ -112,9 +111,12 @@ func (m *Miner) storeGarbage(ctx context.Context, sectorID uint64, existingPiece
return out, nil
}
func (m *Miner) StoreGarbageData(_ context.Context) error {
ctx := context.TODO()
func (m *Miner) StoreGarbageData() error {
go func() {
ctx := context.TODO() // we can't use the context from command which invokes
// this, as we run everything here async, and it's cancelled when the
// command exits
size := sectorbuilder.UserBytesForSectorSize(m.sb.SectorSize())
sid, err := m.sb.AcquireSectorId()

25
storage/sealing_utils.go
View File

@ -7,13 +7,36 @@ import (
)
func fillersFromRem(toFill uint64) ([]uint64, error) {
toFill += toFill / 127 // convert to in-sector bytes for easier math
// Convert to in-sector bytes for easier math:
//
// Sector size to user bytes ratio is constant, e.g. for 1024B we have 1016B
// of user-usable data.
//
// (1024/1016 = 128/127)
//
// Given that we can get sector size by simply adding 1/127 of the user
// bytes
//
// (we convert to sector bytes as they are nice round binary numbers)
toFill += toFill / 127
// We need to fill the sector with pieces that are powers of 2. Conveniently
// computers store numbers in binary, which means we can look at 1s to get
// all the piece sizes we need to fill the sector. It also means that number
// of pieces is the number of 1s in the number of remaining bytes to fill
out := make([]uint64, bits.OnesCount64(toFill))
for i := range out {
// Extract the next lowest non-zero bit
next := bits.TrailingZeros64(toFill)
psize := uint64(1) << next
// e.g: if the number is 0b010100, psize will be 0b000100
// set that bit to 0 by XORing it, so the next iteration looks at the
// next bit
toFill ^= psize
// Add the piece size to the list of pieces we need to create
out[i] = sectorbuilder.UserBytesForSectorSize(psize)
}
return out, nil