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https://github.com/reactos/reactos.git
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Implemented CcZeroData.
svn path=/trunk/; revision=3032
This commit is contained in:
Hartmut Birr
parent
c4d4559cce
commit
8393c73b3b
5 changed files with 221 additions and 5 deletions
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@ -1,4 +1,4 @@
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/* $Id: copy.c,v 1.5 2002/06/04 15:26:55 dwelch Exp $
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/* $Id: copy.c,v 1.6 2002/06/10 21:11:56 hbirr Exp $
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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@ -26,8 +26,29 @@
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#define ROUND_DOWN(N, S) ((N) - ((N) % (S)))
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static PHYSICAL_ADDRESS CcZeroPage = (PHYSICAL_ADDRESS)0LL;
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/* FUNCTIONS *****************************************************************/
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VOID
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InitCacheZeroPage(VOID)
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{
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NTSTATUS Status;
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Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &CcZeroPage);
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if (!NT_SUCCESS(Status))
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{
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DbgPrint("Can't allocate CcZeroPage.\n");
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KeBugCheck(0);
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}
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Status = MiZeroPage(CcZeroPage);
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if (!NT_SUCCESS(Status))
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{
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DbgPrint("Can't zero out CcZeroPage.\n");
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KeBugCheck(0);
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}
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}
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NTSTATUS
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ReadCacheSegmentChain(PBCB Bcb, ULONG ReadOffset, ULONG Length,
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PVOID Buffer)
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@ -410,4 +431,195 @@ CcCopyWrite (
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return TRUE;
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}
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BOOLEAN STDCALL
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CcZeroData (
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IN PFILE_OBJECT FileObject,
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IN PLARGE_INTEGER StartOffset,
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IN PLARGE_INTEGER EndOffset,
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IN BOOLEAN Wait
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)
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{
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NTSTATUS Status;
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LARGE_INTEGER WriteOffset;
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ULONG Length;
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PMDL Mdl;
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ULONG i;
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IO_STATUS_BLOCK Iosb;
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DPRINT("CcZeroData(FileObject %x, StartOffset %I64x, EndOffset %I64x, Wait %d\n",
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FileObject, StartOffset->QuadPart, EndOffset->QuadPart, Wait);
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Length = EndOffset->u.LowPart - StartOffset->u.LowPart;
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// FIXME: NT uses the shared chache map field for cached/non cached detection
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if (((PREACTOS_COMMON_FCB_HEADER)FileObject->FsContext)->Bcb == NULL)
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{
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// File is not cached
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CHECKPOINT;
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WriteOffset.QuadPart = StartOffset->QuadPart;
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while (Length > 0)
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{
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if (Length + WriteOffset.u.LowPart % PAGESIZE > 262144)
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{
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Mdl = MmCreateMdl(NULL, (PVOID)WriteOffset.u.LowPart, 262144 - WriteOffset.u.LowPart % PAGESIZE);
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WriteOffset.QuadPart += (262144 - WriteOffset.u.LowPart % PAGESIZE);
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Length -= (262144 - WriteOffset.u.LowPart % PAGESIZE);
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}
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else
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{
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Mdl = MmCreateMdl(NULL, (PVOID)WriteOffset.u.LowPart, Length - WriteOffset.u.LowPart % PAGESIZE);
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WriteOffset.QuadPart += (Length - WriteOffset.u.LowPart % PAGESIZE);
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Length = 0;
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}
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if (Mdl == NULL)
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{
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return FALSE;
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}
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Mdl->MdlFlags |= (MDL_PAGES_LOCKED | MDL_IO_PAGE_READ);
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for (i = 0; i < ((Mdl->Size - sizeof(MDL)) / sizeof(ULONG)); i++)
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{
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((PULONG)(Mdl + 1))[i] = CcZeroPage.u.LowPart;
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}
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Status = IoPageWrite(FileObject, Mdl, StartOffset, &Iosb, TRUE);
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if (!NT_SUCCESS(Status))
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{
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return FALSE;
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}
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}
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}
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else
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{
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// File is cached
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KIRQL oldirql;
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PBCB Bcb;
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PLIST_ENTRY current_entry;
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PCACHE_SEGMENT CacheSeg, current, previous;
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ULONG TempLength;
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ULONG Start;
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ULONG count;
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ULONG size;
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PHYSICAL_ADDRESS page;
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CHECKPOINT;
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Start = StartOffset->u.LowPart;
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Bcb = ((REACTOS_COMMON_FCB_HEADER*)FileObject->FsContext)->Bcb;
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if (Wait)
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{
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// testing, if the requested datas are available
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KeAcquireSpinLock(&Bcb->BcbLock, &oldirql);
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current_entry = Bcb->BcbSegmentListHead.Flink;
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while (current_entry != &Bcb->BcbSegmentListHead)
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{
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CacheSeg = CONTAINING_RECORD(current_entry, CACHE_SEGMENT, BcbSegmentListEntry);
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if (!CacheSeg->Valid)
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{
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if ((Start >= CacheSeg->FileOffset && Start < CacheSeg->FileOffset + Bcb->CacheSegmentSize)
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|| (Start + Length > CacheSeg->FileOffset &&
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Start + Length <= CacheSeg->FileOffset + Bcb->CacheSegmentSize))
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{
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KeReleaseSpinLock(&Bcb->BcbLock, oldirql);
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// datas not available
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return FALSE;
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}
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}
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current_entry = current_entry->Flink;
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}
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KeReleaseSpinLock(&Bcb->BcbLock, oldirql);
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}
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while (Length > 0)
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{
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WriteOffset.QuadPart = ROUND_DOWN(Start, Bcb->CacheSegmentSize);
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if (Start % Bcb->CacheSegmentSize + Length > 262144)
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{
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Mdl = MmCreateMdl(NULL, NULL, 262144);
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if (Mdl == NULL)
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{
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return FALSE;
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}
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Status = CcRosGetCacheSegmentChain (Bcb, ROUND_DOWN(Start, Bcb->CacheSegmentSize),
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262144, &CacheSeg);
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if (!NT_SUCCESS(Status))
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{
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ExFreePool(Mdl);
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return FALSE;
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}
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}
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else
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{
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Mdl = MmCreateMdl(NULL, (PVOID)ROUND_DOWN(Start, Bcb->CacheSegmentSize),
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ROUND_UP(Start % Bcb->CacheSegmentSize + Length, Bcb->CacheSegmentSize));
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if (Mdl == NULL)
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{
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return FALSE;
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}
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Status = CcRosGetCacheSegmentChain (Bcb, ROUND_DOWN(Start, Bcb->CacheSegmentSize),
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min(ROUND_UP(Start % Bcb->CacheSegmentSize
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+ Length, Bcb->CacheSegmentSize),
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Bcb->AllocationSize.u.LowPart
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- ROUND_DOWN(Start, Bcb->CacheSegmentSize)),
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&CacheSeg);
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if (!NT_SUCCESS(Status))
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{
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ExFreePool(Mdl);
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return FALSE;
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}
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}
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Mdl->MdlFlags |= (MDL_PAGES_LOCKED|MDL_IO_PAGE_READ);
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current = CacheSeg;
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count = 0;
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while (current != NULL)
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{
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if (Start % Bcb->CacheSegmentSize ||
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Start % Bcb->CacheSegmentSize + Length < Bcb->CacheSegmentSize)
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{
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if (!current->Valid)
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{
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// Segment lesen
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Status = ReadCacheSegment(current);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("ReadCacheSegment failed, status %x\n", Status);
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}
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}
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TempLength = min (Length, Bcb->CacheSegmentSize - Start % Bcb->CacheSegmentSize);
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memset (current->BaseAddress + Start % Bcb->CacheSegmentSize, 0, TempLength);
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}
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else
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{
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TempLength = Bcb->CacheSegmentSize;
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memset (current->BaseAddress, 0, Bcb->CacheSegmentSize);
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}
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Start += TempLength;
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Length -= TempLength;
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size = ((Mdl->Size - sizeof(MDL)) / sizeof(ULONG));
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for (i = 0; i < (Bcb->CacheSegmentSize / PAGESIZE) && count < size; i++)
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{
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page = MmGetPhysicalAddressForProcess(NULL, current->BaseAddress + (i * PAGESIZE));
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((PULONG)(Mdl + 1))[count++] = page.u.LowPart;
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}
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current = current->NextInChain;
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}
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// Write the Segment
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Status = IoPageWrite(FileObject, Mdl, &WriteOffset, &Iosb, TRUE);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("IoPageWrite failed, status %x\n", Status);
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}
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current = CacheSeg;
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while (current != NULL)
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{
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previous = current;
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current = current->NextInChain;
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CcRosReleaseCacheSegment(Bcb, previous, TRUE, FALSE, FALSE);
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}
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}
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}
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return TRUE;
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}
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@ -16,7 +16,7 @@
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* $Id: view.c,v 1.42 2002/06/04 15:26:55 dwelch Exp $
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/* $Id: view.c,v 1.43 2002/06/10 21:11:56 hbirr Exp $
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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@ -576,6 +576,7 @@ CcInitView(VOID)
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InitializeListHead(&CacheSegmentLRUListHead);
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ExInitializeFastMutex(&ViewLock);
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MmInitializeMemoryConsumer(MC_CACHE, CcRosTrimCache);
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InitCacheZeroPage();
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}
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/* EOF */
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@ -1,6 +1,6 @@
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#ifndef __INCLUDE_INTERNAL_CC_H
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#define __INCLUDE_INTERNAL_CC_H
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/* $Id: cc.h,v 1.10 2002/01/26 21:21:02 dwelch Exp $ */
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/* $Id: cc.h,v 1.11 2002/06/10 21:11:56 hbirr Exp $ */
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#include <ddk/ntifs.h>
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typedef struct _BCB
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@ -76,4 +76,5 @@ CcRosGetCacheSegmentChain(PBCB Bcb,
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ULONG FileOffset,
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ULONG Length,
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PCACHE_SEGMENT* CacheSeg);
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VOID InitCacheZeroPage(VOID);
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#endif
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@ -1,4 +1,4 @@
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; $Id: ntoskrnl.def,v 1.134 2002/06/05 16:53:36 ekohl Exp $
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; $Id: ntoskrnl.def,v 1.135 2002/06/10 21:11:56 hbirr Exp $
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;
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; reactos/ntoskrnl/ntoskrnl.def
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;
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@ -16,6 +16,7 @@ CcMdlReadComplete@8
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CcSetDirtyPinnedData@8
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CcSetFileSizes@8
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CcUnpinData@4
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CcZeroData@16
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DbgBreakPoint@0
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DbgBreakPointWithStatus@4
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;DbgLoadImageSymbols@12
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@ -1,4 +1,4 @@
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; $Id: ntoskrnl.edf,v 1.120 2002/06/05 16:53:36 ekohl Exp $
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; $Id: ntoskrnl.edf,v 1.121 2002/06/10 21:11:56 hbirr Exp $
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;
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; reactos/ntoskrnl/ntoskrnl.def
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;
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@ -16,6 +16,7 @@ CcMapData=CcMapData@24
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CcSetDirtyPinnedData=CcSetDirtyPinnedData@8
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CcUnpinData=CcUnpinData@4
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CcSetFileSizes=CcSetFileSizes@8
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CcZeroData=CcZeroData@16
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DbgBreakPoint=DbgBreakPoint@0
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DbgBreakPointWithStatus=DbgBreakPointWithStatus@4
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;DbgLoadImageSymbols=DbgLoadImageSymbols@12
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