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https://github.com/reactos/reactos.git
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- Do not immediately write the zeroed region to the disk for a cached file.
- Fixed a problem, which does occur if the cluster size is lower than the segment size. svn path=/trunk/; revision=9472
This commit is contained in:
Hartmut Birr
parent
d805aabcae
commit
ef7b36dd46
1 changed files with 49 additions and 108 deletions
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@ -1,4 +1,4 @@
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/* $Id: copy.c,v 1.20 2003/12/30 18:52:03 fireball Exp $
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/* $Id: copy.c,v 1.21 2004/05/22 18:28:18 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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@ -32,6 +32,8 @@ static PHYSICAL_ADDRESS CcZeroPage = (PHYSICAL_ADDRESS)0LL;
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static PHYSICAL_ADDRESS CcZeroPage = { 0 };
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#endif
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#define MAX_ZERO_LENGTH (256 * 1024)
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/* FUNCTIONS *****************************************************************/
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VOID
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@ -354,15 +356,7 @@ CcCopyRead (IN PFILE_OBJECT FileObject,
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ReadLength += TempLength;
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Length -= TempLength;
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ReadOffset += TempLength;
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#if defined(__GNUC__)
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Buffer += TempLength;
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#else
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{
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char* pTemp = Buffer;
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pTemp += TempLength;
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Buffer = pTemp;
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}
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#endif
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Buffer = (PVOID)((char*)Buffer + TempLength);
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}
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while (Length > 0)
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{
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@ -523,41 +517,35 @@ CcZeroData (IN PFILE_OBJECT FileObject,
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NTSTATUS Status;
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LARGE_INTEGER WriteOffset;
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ULONG Length;
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ULONG CurrentLength;
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PMDL Mdl;
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ULONG i;
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IO_STATUS_BLOCK Iosb;
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KEVENT Event;
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DPRINT("CcZeroData(FileObject %x, StartOffset %I64x, EndOffset %I64x, "
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"Wait %d\n", FileObject, StartOffset->QuadPart, EndOffset->QuadPart,
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"Wait %d)\n", FileObject, StartOffset->QuadPart, EndOffset->QuadPart,
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Wait);
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Length = EndOffset->u.LowPart - StartOffset->u.LowPart;
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WriteOffset.QuadPart = StartOffset->QuadPart;
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if (FileObject->SectionObjectPointer->SharedCacheMap == NULL)
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{
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/* File is not cached */
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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 % PAGE_SIZE > 262144)
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if (Length + WriteOffset.u.LowPart % PAGE_SIZE > MAX_ZERO_LENGTH)
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{
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Mdl = MmCreateMdl(NULL, (PVOID)WriteOffset.u.LowPart,
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262144 - WriteOffset.u.LowPart % PAGE_SIZE);
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WriteOffset.QuadPart +=
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(262144 - WriteOffset.u.LowPart % PAGE_SIZE);
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Length -= (262144 - WriteOffset.u.LowPart % PAGE_SIZE);
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CurrentLength = MAX_ZERO_LENGTH - WriteOffset.u.LowPart % PAGE_SIZE;
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}
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else
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{
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Mdl =
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MmCreateMdl(NULL, (PVOID)WriteOffset.u.LowPart,
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Length - WriteOffset.u.LowPart % PAGE_SIZE);
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WriteOffset.QuadPart +=
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(Length - WriteOffset.u.LowPart % PAGE_SIZE);
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Length = 0;
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CurrentLength = Length;
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}
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Mdl = MmCreateMdl(NULL, (PVOID)WriteOffset.u.LowPart, CurrentLength);
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if (Mdl == NULL)
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{
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return(FALSE);
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@ -568,7 +556,7 @@ CcZeroData (IN PFILE_OBJECT FileObject,
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((PULONG)(Mdl + 1))[i] = CcZeroPage.u.LowPart;
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}
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KeInitializeEvent(&Event, NotificationEvent, FALSE);
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Status = IoPageWrite(FileObject, Mdl, StartOffset, &Event, &Iosb);
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Status = IoPageWrite(FileObject, Mdl, &WriteOffset, &Event, &Iosb);
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if (Status == STATUS_PENDING)
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{
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KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
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@ -578,6 +566,8 @@ CcZeroData (IN PFILE_OBJECT FileObject,
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{
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return(FALSE);
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}
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WriteOffset.QuadPart += CurrentLength;
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Length -= CurrentLength;
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}
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}
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else
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@ -588,12 +578,7 @@ CcZeroData (IN PFILE_OBJECT FileObject,
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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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Start = StartOffset->u.LowPart;
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Bcb = FileObject->SectionObjectPointer->SharedCacheMap;
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if (Wait)
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{
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@ -606,10 +591,10 @@ CcZeroData (IN PFILE_OBJECT FileObject,
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BcbSegmentListEntry);
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if (!CacheSeg->Valid)
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{
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if ((Start >= CacheSeg->FileOffset &&
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Start < CacheSeg->FileOffset + Bcb->CacheSegmentSize)
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|| (Start + Length > CacheSeg->FileOffset &&
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Start + Length <=
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if ((WriteOffset.u.LowPart >= CacheSeg->FileOffset &&
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WriteOffset.u.LowPart < CacheSeg->FileOffset + Bcb->CacheSegmentSize)
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|| (WriteOffset.u.LowPart + Length > CacheSeg->FileOffset &&
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WriteOffset.u.LowPart + Length <=
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CacheSeg->FileOffset + Bcb->CacheSegmentSize))
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{
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KeReleaseSpinLock(&Bcb->BcbLock, oldirql);
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@ -621,56 +606,35 @@ CcZeroData (IN PFILE_OBJECT FileObject,
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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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ULONG RStart = ROUND_DOWN(Start, Bcb->CacheSegmentSize);
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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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ULONG Offset;
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Offset = WriteOffset.u.LowPart % Bcb->CacheSegmentSize;
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if (Length + Offset > MAX_ZERO_LENGTH)
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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, RStart,
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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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CurrentLength = MAX_ZERO_LENGTH - Offset;
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}
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else
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{
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ULONG RLength;
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RLength = Start % Bcb->CacheSegmentSize + Length;
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RLength = ROUND_UP(RLength, Bcb->CacheSegmentSize);
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Mdl = MmCreateMdl(NULL, (PVOID)RStart, RLength);
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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, RStart, RLength,
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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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CurrentLength = Length;
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}
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Status = CcRosGetCacheSegmentChain (Bcb, WriteOffset.u.LowPart - Offset,
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Offset + CurrentLength, &CacheSeg);
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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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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) != 0 ||
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Start % Bcb->CacheSegmentSize + Length <
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Bcb->CacheSegmentSize)
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{
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Offset = WriteOffset.u.LowPart % Bcb->CacheSegmentSize;
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if (Offset != 0 ||
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Offset + CurrentLength < 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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/* read the segment */
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Status = ReadCacheSegment(current);
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if (!NT_SUCCESS(Status))
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{
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@ -678,50 +642,27 @@ CcZeroData (IN PFILE_OBJECT FileObject,
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Status);
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}
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}
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TempLength = min (Length, Bcb->CacheSegmentSize -
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Start % Bcb->CacheSegmentSize);
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memset ((char*)current->BaseAddress + Start % Bcb->CacheSegmentSize,
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0, TempLength);
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TempLength = min (CurrentLength, Bcb->CacheSegmentSize - Offset);
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}
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else
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{
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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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memset ((PUCHAR)current->BaseAddress + Offset, 0, TempLength);
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WriteOffset.QuadPart += TempLength;
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CurrentLength -= 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 / PAGE_SIZE) &&
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count < size; i++)
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{
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PVOID Address;
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Address = (char*)current->BaseAddress + (i * PAGE_SIZE);
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page =
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MmGetPhysicalAddressForProcess(NULL, Address);
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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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KeInitializeEvent(&Event, NotificationEvent, FALSE);
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Status = IoPageWrite(FileObject, Mdl, &WriteOffset, &Event, &Iosb);
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if (Status == STATUS_PENDING)
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{
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KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
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Status = Iosb.Status;
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}
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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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current = current->NextInChain;
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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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CcRosReleaseCacheSegment(Bcb, previous, TRUE, TRUE, FALSE);
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}
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}
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}
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