mirror of
https://github.com/reactos/reactos.git
synced 2024-12-26 17:14:41 +00:00
add a read buffer of one cluster for each file
svn path=/trunk/; revision=230
This commit is contained in:
jean
parent
36714219d9
commit
2f1849aae9
1 changed files with 92 additions and 52 deletions
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@ -617,12 +617,16 @@ NTSTATUS FindFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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return(STATUS_SUCCESS);
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}
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}
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TempFcb.Buffer=NULL;
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if (Parent==NULL)
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{
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memset(&TempFcb,0,sizeof(VfatFCB));
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memset(TempFcb.entry.Filename,' ',11);
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TempFcb.entry.FileSize=DeviceExt->rootDirectorySectors*BLOCKSIZE;
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TempFcb.entry.Attrib=FILE_ATTRIBUTE_DIRECTORY;
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TempFcb.Buffer=ExAllocatePool(NonPagedPool,DeviceExt->BytesPerCluster);
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TempFcb.Cluster=0xFFFFFFFF;
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TempFcb.Flags=0;
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if (DeviceExt->FatType == FAT32)
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TempFcb.entry.FirstCluster=2;
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else
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@ -650,11 +654,13 @@ NTSTATUS FindFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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memcpy(&Fcb->entry,&FatEntry,sizeof(FATDirEntry));
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vfat_wcsncpy(Fcb->ObjectName,name,MAX_PATH);
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if(Entry) *Entry=i;
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if(TempFcb.Buffer) ExFreePool(TempFcb.Buffer);
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return(STATUS_SUCCESS);
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}
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}
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}
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if(Entry) *Entry=i;
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if(TempFcb.Buffer) ExFreePool(TempFcb.Buffer);
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return(STATUS_UNSUCCESSFUL);
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}
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@ -667,8 +673,11 @@ NTSTATUS FsdCloseFile(PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject)
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PVfatFCB pFcb;
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PVfatCCB pCcb;
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//FIXME : update entry in directory ?
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assert(FileObject);
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pCcb = (PVfatCCB)(FileObject->FsContext2);
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if(!pCcb) return STATUS_UNSUCCESSFUL;
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pFcb = pCcb->pFcb;
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assert(pFcb);
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pFcb->RefCount--;
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if(pFcb->RefCount<=0)
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{
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@ -678,6 +687,7 @@ NTSTATUS FsdCloseFile(PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject)
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pFirstFcb=pFcb->nextFcb;
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if(pFcb->nextFcb)
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pFcb->nextFcb->prevFcb=pFcb->prevFcb;
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ExFreePool(pFcb->Buffer);
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ExFreePool(pFcb);
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}
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ExFreePool(pCcb);
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@ -707,7 +717,6 @@ NTSTATUS FsdOpenFile(PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject,
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// treat relative name
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if(FileObject->RelatedFileObject)
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{
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DbgPrint("try related for %w\n",FileName);
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pRelFileObject=FileObject->RelatedFileObject;
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pRelCcb=pRelFileObject->FsContext2;
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assert(pRelCcb);
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@ -753,12 +762,20 @@ DbgPrint("try related for %w\n",FileName);
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Fcb = ExAllocatePool(NonPagedPool, sizeof(VfatFCB));
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memset(Fcb,0,sizeof(VfatFCB));
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Fcb->ObjectName=Fcb->PathName;
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Fcb->Buffer=ExAllocatePool(NonPagedPool,DeviceExt->BytesPerCluster);
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Fcb->Cluster=0xFFFFFFFF;
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Fcb->Flags=0;
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next = &string[0];
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current = next+1;
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if(*next==0) // root
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{
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Status = FindFile(DeviceExt,Fcb,ParentFcb,next,NULL);
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memset(Fcb->entry.Filename,' ',11);
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Fcb->entry.FileSize=DeviceExt->rootDirectorySectors*BLOCKSIZE;
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Fcb->entry.Attrib=FILE_ATTRIBUTE_DIRECTORY;
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if (DeviceExt->FatType == FAT32)
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Fcb->entry.FirstCluster=2;
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else Fcb->entry.FirstCluster=1;//FIXME : is 1 the good value for mark root?
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ParentFcb=Fcb;
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Fcb=NULL;
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}
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@ -786,6 +803,9 @@ DbgPrint("try related for %w\n",FileName);
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Fcb = ExAllocatePool(NonPagedPool,sizeof(VfatFCB));
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memset(Fcb,0,sizeof(VfatFCB));
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Fcb->ObjectName=Fcb->PathName;
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Fcb->Buffer=ExAllocatePool(NonPagedPool,DeviceExt->BytesPerCluster);
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Fcb->Cluster=0xFFFFFFFF;
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Fcb->Flags=0;
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}
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else Fcb = ParentFcb;
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ParentFcb = Temp;
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@ -799,12 +819,18 @@ DbgPrint("try related for %w\n",FileName);
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newCCB->PtrFileObject=FileObject;
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ParentFcb->RefCount++;
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//FIXME : initialize all fields in FCB and CCB
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ParentFcb->Cluster=0xFFFFFFFF;
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ParentFcb->Flags=0;
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ParentFcb->nextFcb=pFirstFcb;
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pFirstFcb=ParentFcb;
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vfat_wcsncpy(ParentFcb->PathName,FileName,MAX_PATH);
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ParentFcb->ObjectName=ParentFcb->PathName+(current-FileName);
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ParentFcb->pDevExt=DeviceExt;
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if(Fcb) ExFreePool(Fcb);
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if(Fcb)
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{
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ExFreePool(Fcb->Buffer);
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ExFreePool(Fcb);
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}
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if(AbsFileName)ExFreePool(AbsFileName);
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return(STATUS_SUCCESS);
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}
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@ -922,12 +948,14 @@ NTSTATUS FsdReadFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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ULONG CurrentCluster;
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ULONG FileOffset;
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ULONG FirstCluster;
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PVOID Temp;
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// PVOID Temp;
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ULONG TempLength;
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/* PRECONDITION */
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assert(DeviceExt != NULL);
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assert(DeviceExt->BytesPerCluster != 0);
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assert(Fcb);
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assert(Fcb->Buffer != NULL);
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if (DeviceExt->FatType == FAT32)
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CurrentCluster = Fcb->entry.FirstCluster
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@ -946,9 +974,6 @@ NTSTATUS FsdReadFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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Length = Fcb->entry.FileSize - ReadOffset;
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}
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*LengthRead = 0;
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/* FIXME: optimize by remembering the last cluster read and using if possible */
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Temp = ExAllocatePool(NonPagedPool,DeviceExt->BytesPerCluster);
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if(!Temp) return STATUS_UNSUCCESSFUL;
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if (FirstCluster==1)
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{ //root of FAT16 or FAT12
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CurrentCluster=DeviceExt->rootStart+ReadOffset
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@ -964,19 +989,23 @@ NTSTATUS FsdReadFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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{
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if (FirstCluster==1)
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{
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VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Temp);
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if(CurrentCluster!=Fcb->Cluster)
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VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Fcb->Buffer);
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Fcb->Cluster=CurrentCluster;
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CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
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}
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else
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{
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VFATLoadCluster(DeviceExt,Temp,CurrentCluster);
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if(CurrentCluster!=Fcb->Cluster)
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VFATLoadCluster(DeviceExt,Fcb->Buffer,CurrentCluster);
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Fcb->Cluster=CurrentCluster;
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CurrentCluster = GetNextCluster(DeviceExt, CurrentCluster);
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}
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TempLength = min(Length,DeviceExt->BytesPerCluster -
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(ReadOffset % DeviceExt->BytesPerCluster));
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memcpy(Buffer, Temp + ReadOffset % DeviceExt->BytesPerCluster,
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memcpy(Buffer, Fcb->Buffer + ReadOffset % DeviceExt->BytesPerCluster,
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TempLength);
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(*LengthRead) = (*LengthRead) + TempLength;
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@ -987,42 +1016,49 @@ NTSTATUS FsdReadFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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{
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if (FirstCluster==1)
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{
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VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Buffer);
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if(CurrentCluster!=Fcb->Cluster)
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VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Fcb->Buffer);
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Fcb->Cluster=CurrentCluster;
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CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
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}
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else
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{
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VFATLoadCluster(DeviceExt,Buffer,CurrentCluster);
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if(CurrentCluster!=Fcb->Cluster)
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VFATLoadCluster(DeviceExt,Fcb->Buffer,CurrentCluster);
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Fcb->Cluster=CurrentCluster;
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CurrentCluster = GetNextCluster(DeviceExt, CurrentCluster);
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}
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if (CurrentCluster == 0xffffffff)
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memcpy(Buffer, Fcb->Buffer, DeviceExt->BytesPerCluster);
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if (CurrentCluster == 0xffffffff)
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{
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ExFreePool(Temp);
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return(STATUS_SUCCESS);
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}
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(*LengthRead) = (*LengthRead) + DeviceExt->BytesPerCluster;
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Buffer = Buffer + DeviceExt->BytesPerCluster;
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Length = Length - DeviceExt->BytesPerCluster;
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}
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}
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if (Length > 0)
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{
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{
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(*LengthRead) = (*LengthRead) + Length;
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if (FirstCluster==1)
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{
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{
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if(CurrentCluster!=Fcb->Cluster)
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VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Temp);
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CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
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}
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,DeviceExt->Boot->SectorsPerCluster,Fcb->Buffer);
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Fcb->Cluster=CurrentCluster;
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CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
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}
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else
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{
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VFATLoadCluster(DeviceExt,Temp,CurrentCluster);
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if(CurrentCluster!=Fcb->Cluster)
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VFATLoadCluster(DeviceExt,Fcb->Buffer,CurrentCluster);
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Fcb->Cluster=CurrentCluster;
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CurrentCluster = GetNextCluster(DeviceExt, CurrentCluster);
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}
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memcpy(Buffer, Temp, Length);
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memcpy(Buffer, Fcb->Buffer, Length);
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}
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ExFreePool(Temp);
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return(STATUS_SUCCESS);
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}
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@ -1035,7 +1071,6 @@ NTSTATUS FsdWriteFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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ULONG CurrentCluster;
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ULONG FileOffset;
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ULONG FirstCluster;
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PVOID Temp;
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ULONG TempLength,Length2=Length;
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CHECKPOINT;
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@ -1053,10 +1088,6 @@ NTSTATUS FsdWriteFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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else
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CurrentCluster = Fcb->entry.FirstCluster;
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FirstCluster=CurrentCluster;
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/* Allocate a buffer to hold 1 cluster of data */
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Temp = ExAllocatePool(NonPagedPool,DeviceExt->BytesPerCluster);
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assert(Temp);
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/* Find the cluster according to the offset in the file */
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@ -1095,26 +1126,29 @@ NTSTATUS FsdWriteFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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TempLength = min(Length,DeviceExt->BytesPerCluster -
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(WriteOffset % DeviceExt->BytesPerCluster));
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/* Read in the existing cluster data */
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if (FirstCluster==1)
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VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Temp);
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else
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VFATLoadCluster(DeviceExt,Temp,CurrentCluster);
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if(CurrentCluster!=Fcb->Cluster)
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{
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if (FirstCluster==1)
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VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Fcb->Buffer);
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else
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VFATLoadCluster(DeviceExt,Fcb->Buffer,CurrentCluster);
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Fcb->Cluster=CurrentCluster;
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}
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/* Overwrite the last parts of the data as necessary */
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memcpy(Temp + (WriteOffset % DeviceExt->BytesPerCluster), Buffer,
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memcpy(Fcb->Buffer + (WriteOffset % DeviceExt->BytesPerCluster), Buffer,
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TempLength);
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/* Write the cluster back */
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if (FirstCluster==1)
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{
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VFATWriteSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Temp);
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,DeviceExt->Boot->SectorsPerCluster,Fcb->Buffer);
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CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
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}
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else
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{
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VFATWriteCluster(DeviceExt,Temp,CurrentCluster);
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VFATWriteCluster(DeviceExt,Fcb->Buffer,CurrentCluster);
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CurrentCluster = GetNextCluster(DeviceExt, CurrentCluster);
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}
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Length2 -= TempLength;
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@ -1129,18 +1163,21 @@ NTSTATUS FsdWriteFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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CHECKPOINT;
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if (CurrentCluster == 0)
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{
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ExFreePool(Temp);
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return(STATUS_UNSUCCESSFUL);
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}
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if (FirstCluster==1)
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{
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VFATWriteSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Buffer);
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Fcb->Cluster=CurrentCluster;
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memcpy(Fcb->Buffer,Buffer,DeviceExt->Boot->SectorsPerCluster);
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CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
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}
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else
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{
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VFATWriteCluster(DeviceExt,Buffer,CurrentCluster);
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Fcb->Cluster=CurrentCluster;
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memcpy(Fcb->Buffer,Buffer,DeviceExt->Boot->SectorsPerCluster);
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CurrentCluster = GetNextCluster(DeviceExt, CurrentCluster);
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}
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Buffer = Buffer + DeviceExt->BytesPerCluster;
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@ -1154,23 +1191,26 @@ NTSTATUS FsdWriteFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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{
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if (CurrentCluster == 0)
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{
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ExFreePool(Temp);
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return(STATUS_UNSUCCESSFUL);
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}
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/* Read in the existing cluster data */
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if (FirstCluster==1)
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VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Temp);
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else
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VFATLoadCluster(DeviceExt,Temp,CurrentCluster);
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memcpy(Temp, Buffer, Length2);
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if(CurrentCluster!=Fcb->Cluster)
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{
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if (FirstCluster==1)
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VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Fcb->Buffer);
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else
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VFATLoadCluster(DeviceExt,Fcb->Buffer,CurrentCluster);
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Fcb->Cluster=CurrentCluster;
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}
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memcpy(Fcb->Buffer, Buffer, Length2);
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if (FirstCluster==1)
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{
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VFATWriteSectors(DeviceExt->StorageDevice,CurrentCluster
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,DeviceExt->Boot->SectorsPerCluster,Temp);
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,DeviceExt->Boot->SectorsPerCluster,Fcb->Buffer);
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}
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else
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VFATWriteCluster(DeviceExt,Temp,CurrentCluster);
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VFATWriteCluster(DeviceExt,Fcb->Buffer,CurrentCluster);
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}
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//FIXME : set last write time and date
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if(Fcb->entry.FileSize<WriteOffset+Length
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@ -1180,7 +1220,6 @@ NTSTATUS FsdWriteFile(PDEVICE_EXTENSION DeviceExt, PVfatFCB Fcb,
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// update entry in directory
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updEntry(DeviceExt,Fcb);
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}
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ExFreePool(Temp);
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return(STATUS_SUCCESS);
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}
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@ -1283,6 +1322,7 @@ NTSTATUS FsdCreate(PDEVICE_OBJECT DeviceObject, PIRP Irp)
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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ExReleaseResourceForThreadLite(&(DeviceExt->Resource),ExGetCurrentResourceThread());
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DbgPrint("open, Status=%x\n",Status);
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return Status;
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}
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@ -1345,9 +1385,9 @@ NTSTATUS FsdRead(PDEVICE_OBJECT DeviceObject, PIRP Irp)
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Length = Stack->Parameters.Read.Length;
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Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
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Offset = GET_LARGE_INTEGER_LOW_PART(Stack->Parameters.Read.ByteOffset);
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assert(FileObject->FsContext2 != NULL);
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pFcb = ((PVfatCCB)(FileObject->FsContext2))->pFcb;
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assert(pFcb);
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Status = FsdReadFile(DeviceExt,pFcb,Buffer,Length,Offset,
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&LengthRead);
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@ -1512,7 +1552,7 @@ NTSTATUS DriverEntry(PDRIVER_OBJECT _DriverObject,
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UNICODE_STRING ustr;
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ANSI_STRING astr;
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DbgPrint("VFAT 0.0.6\n");
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DbgPrint("VFAT 0.0.7\n");
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pFirstFcb=NULL;
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VFATDriverObject = _DriverObject;
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