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sys: IRP_MJ_READ: implementation

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This commit is contained in:
Bill Zissimopoulos
2016-03-04 19:20:41 -08:00
parent c7c367ccc8
commit bf02a601b2
5 changed files with 175 additions and 31 deletions
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32
src/sys/write.c
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@ -251,38 +251,10 @@ static NTSTATUS FspFsvolWriteNonCached(
if (PagingIo && WriteToEndOfFile)
return STATUS_INVALID_PARAMETER;
/* if non-cached I/O check the offset/length alignment */
/*
* We are going to avoid doing this test, because we don't really need to restrict
* ourselves for non-cached I/O, but also because we do not always know the correct
* file size for our alignment test. The file size is needed, because the alignment
* test is:
*
* if WriteOffset is sector aligned
* and (WriteLength is sector aligned or WriteOffset + WriteLength >= FileSize)
*
* This means that the user-mode file system must be able to deal with variable size
* I/O, but this was the case anyway because of the following part of the test:
*
* WriteOffset + WriteLength >= FileSize
*
* In any case the user-mode file system can enforce this rule if it wants!
*/
#if 0
if (!PagingIo)
{
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension =
FspFsvolDeviceExtension(FsvolDeviceObject);
if (0 != WriteOffset.QuadPart % FsvolDeviceExtension->VolumeParams.SectorSize ||
0 != WriteLength % FsvolDeviceExtension->VolumeParams.SectorSize)
return STATUS_NOT_IMPLEMENTED; /* FastFat does this! */
}
#endif
/* probe and lock the user buffer */
if (0 == Irp->MdlAddress)
{
Result = FspLockUserBuffer(Irp->UserBuffer, IrpSp->Parameters.Write.Length,
Result = FspLockUserBuffer(Irp->UserBuffer, WriteLength,
Irp->RequestorMode, IoReadAccess, &Irp->MdlAddress);
if (!NT_SUCCESS(Result))
return Result;
@ -382,7 +354,7 @@ NTSTATUS FspFsvolWritePrepare(
Request->Req.Write.Address = (UINT64)(UINT_PTR)Address;
FspFileNodeSetOwner(FileNode, Pgio, Request);
FspFileNodeSetOwner(FileNode, Full, Request);
FspIopRequestContext(Request, RequestIrp) = Irp;
FspIopRequestContext(Request, RequestSafeMdl) = SafeMdl;
FspIopRequestContext(Request, RequestAddress) = Address;