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sys: IRP_MJ_READ: implementation

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This commit is contained in:
Bill Zissimopoulos
2016-03-04 17:08:46 -08:00
parent b4160f4aac
commit c7c367ccc8
4 changed files with 249 additions and 7 deletions
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83
src/sys/util.c
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@ -15,8 +15,13 @@ NTSTATUS FspMapLockedPagesInUserMode(PMDL Mdl, PVOID *PAddress);
NTSTATUS FspCcInitializeCacheMap(PFILE_OBJECT FileObject, PCC_FILE_SIZES FileSizes,
BOOLEAN PinAccess, PCACHE_MANAGER_CALLBACKS Callbacks, PVOID CallbackContext);
NTSTATUS FspCcSetFileSizes(PFILE_OBJECT FileObject, PCC_FILE_SIZES FileSizes);
NTSTATUS FspCcCopyRead(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULONG Length,
BOOLEAN Wait, PVOID Buffer, PIO_STATUS_BLOCK IoStatus);
NTSTATUS FspCcCopyWrite(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULONG Length,
BOOLEAN Wait, PVOID Buffer);
NTSTATUS FspCcMdlRead(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULONG Length,
PMDL *PMdlChain, PIO_STATUS_BLOCK IoStatus);
NTSTATUS FspCcMdlReadComplete(PFILE_OBJECT FileObject, PMDL MdlChain);
NTSTATUS FspCcPrepareMdlWrite(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULONG Length,
PMDL *PMdlChain, PIO_STATUS_BLOCK IoStatus);
NTSTATUS FspCcMdlWriteComplete(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, PMDL MdlChain);
@ -44,7 +49,10 @@ VOID FspSafeMdlDelete(FSP_SAFE_MDL *SafeMdl);
#pragma alloc_text(PAGE, FspMapLockedPagesInUserMode)
#pragma alloc_text(PAGE, FspCcInitializeCacheMap)
#pragma alloc_text(PAGE, FspCcSetFileSizes)
#pragma alloc_text(PAGE, FspCcCopyRead)
#pragma alloc_text(PAGE, FspCcCopyWrite)
#pragma alloc_text(PAGE, FspCcMdlRead)
#pragma alloc_text(PAGE, FspCcMdlReadComplete)
#pragma alloc_text(PAGE, FspCcPrepareMdlWrite)
#pragma alloc_text(PAGE, FspCcMdlWriteComplete)
#pragma alloc_text(PAGE, FspQuerySecurityDescriptorInfo)
@ -249,6 +257,32 @@ NTSTATUS FspCcSetFileSizes(PFILE_OBJECT FileObject, PCC_FILE_SIZES FileSizes)
}
}
NTSTATUS FspCcCopyRead(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULONG Length,
BOOLEAN Wait, PVOID Buffer, PIO_STATUS_BLOCK IoStatus)
{
PAGED_CODE();
NTSTATUS Result;
try
{
BOOLEAN Success = CcCopyRead(FileObject, FileOffset, Length, Wait, Buffer, IoStatus);
Result = Success ? STATUS_SUCCESS : STATUS_PENDING;
}
except (EXCEPTION_EXECUTE_HANDLER)
{
Result = GetExceptionCode();
}
if (!NT_SUCCESS(Result))
{
IoStatus->Information = 0;
IoStatus->Status = Result;
}
return Result;
}
NTSTATUS FspCcCopyWrite(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULONG Length,
BOOLEAN Wait, PVOID Buffer)
{
@ -265,6 +299,55 @@ NTSTATUS FspCcCopyWrite(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULON
}
}
NTSTATUS FspCcMdlRead(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULONG Length,
PMDL *PMdlChain, PIO_STATUS_BLOCK IoStatus)
{
PAGED_CODE();
NTSTATUS Result;
*PMdlChain = 0;
try
{
CcMdlRead(FileObject, FileOffset, Length, PMdlChain, IoStatus);
Result = IoStatus->Status;
}
except(EXCEPTION_EXECUTE_HANDLER)
{
Result = GetExceptionCode();
}
if (!NT_SUCCESS(Result))
{
if (0 != *PMdlChain)
{
CcMdlReadComplete(FileObject, *PMdlChain);
*PMdlChain = 0;
}
IoStatus->Information = 0;
IoStatus->Status = Result;
}
return Result;
}
NTSTATUS FspCcMdlReadComplete(PFILE_OBJECT FileObject, PMDL MdlChain)
{
PAGED_CODE();
try
{
CcMdlReadComplete(FileObject, MdlChain);
return STATUS_SUCCESS;
}
except (EXCEPTION_EXECUTE_HANDLER)
{
return GetExceptionCode();
}
}
NTSTATUS FspCcPrepareMdlWrite(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffset, ULONG Length,
PMDL *PMdlChain, PIO_STATUS_BLOCK IoStatus)
{