Revert "Remove OldHashSector in PDisk (ydb-platform#6465)"

This reverts commit 11ed7b0.

Author: Vlad Kuznecov

ydb/core/blobstorage/pdisk/blobstorage_pdisk_crypto.h

@@ -12,6 +12,19 @@ namespace NPDisk {
 
 class TPDiskHashCalculator : public THashCalculator {
 public:
+    ui64 OldHashSector(const ui64 sectorOffset, const ui64 magic, const ui8 *sector,
+            const ui32 sectorSize) {
+        REQUEST_VALGRIND_CHECK_MEM_IS_DEFINED(&sectorOffset, sizeof sectorOffset);
+        REQUEST_VALGRIND_CHECK_MEM_IS_DEFINED(&magic, sizeof magic);
+        REQUEST_VALGRIND_CHECK_MEM_IS_DEFINED(sector, sectorSize - sizeof(ui64));
+
+        THashCalculator::Clear();
+        THashCalculator::Hash(&sectorOffset, sizeof sectorOffset);
+        THashCalculator::Hash(&magic, sizeof magic);
+        THashCalculator::Hash(sector, sectorSize - sizeof(ui64));
+        return THashCalculator::GetHashResult();
+    }
+
     template<class THasher>
     ui64 T1ha0HashSector(const ui64 sectorOffset, const ui64 magic, const ui8 *sector,
             const ui32 sectorSize) {
@@ -31,7 +44,11 @@ class TPDiskHashCalculator : public THashCalculator {
 
     bool CheckSectorHash(const ui64 sectorOffset, const ui64 magic, const ui8 *sector,
             const ui32 sectorSize, const ui64 sectorHash) {
-        return sectorHash == T1ha0HashSector<TT1ha0NoAvxHasher>(sectorOffset, magic, sector, sectorSize);
+        // On production servers may be two versions.
+        // If by default used OldHash version, then use it first
+        // If by default used T1ha0NoAvx version, then use it
+        return sectorHash == T1ha0HashSector<TT1ha0NoAvxHasher>(sectorOffset, magic, sector, sectorSize)
+            || sectorHash == OldHashSector(sectorOffset, magic, sector, sectorSize);
     }
 };
 

ydb/core/blobstorage/pdisk/blobstorage_pdisk_sectorrestorator.cpp

@@ -51,6 +51,7 @@ void TSectorRestorator::Restore(ui8 *source, const ui64 offset, const ui64 magic
                     (ErasureDataParts, ErasureDataParts),
                     (Sector, i),
                     (ReadHash, sectorFooter->Hash),
+                    (CalculatedOldHash, hasher.OldHashSector(sectorOffset, magic, sectorData, Format.SectorSize)),
                     (CalculatedT1ha0NoAvxHash, hasher.T1ha0HashSector<TT1ha0NoAvxHasher>(sectorOffset, magic, sectorData, Format.SectorSize)),
                     (SectorOffset, sectorOffset),
                     (chunkIdx, sectorOffset / (ui64)Format.ChunkSize),

ydb/core/blobstorage/pdisk/blobstorage_pdisk_util_ut.cpp

@@ -356,14 +356,17 @@ void TestPayloadOffset(ui64 firstSector, ui64 lastSector, ui64 currentSector, ui
         const ui64 magic = 0x123951924;
         const ui64 offset = format.SectorSize * 17;
         ui64 nonce = 1;
-        for (ui32 i = 1; i < sectors.Size(); ++i) {
+        for (ui32 i = 0; i < sectors.Size(); ++i) {
             memset(sectors[i].Begin(), 13, sectors[i].Size());
             sectors[i].SetCanary();
             auto *footer = sectors[i].GetDataFooter();
             footer->Version = PDISK_DATA_VERSION;
             footer->Nonce = nonce++;
             NPDisk::TPDiskHashCalculator hasher;
             switch (i) {
+            case 0:
+                footer->Hash = hasher.OldHashSector(offset, magic, sectors[i].Begin(), sectors[i].Size());
+                break;
             case 1:
                 footer->Hash = hasher.T1ha0HashSector<TT1ha0NoAvxHasher>(offset, magic, sectors[i].Begin(), sectors[i].Size());
                 break;