Public/winfsp
1
0
Fork 0
mirror of https://github.com/winfsp/winfsp.git synced 2025-06-14 15:52:47 -05:00
Code Issues Packages Projects Releases Wiki Activity

sys: IRP_MJ_FLUSH_BUFFERS

Browse Source
This commit is contained in:
Bill Zissimopoulos
2016-04-02 11:38:24 -07:00
parent b187d47bca
commit e6ab31a0e0
8 changed files with 128 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/sys/driver.h
View File

@ -408,6 +408,8 @@ 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);
NTSTATUS FspCcFlushCache(PSECTION_OBJECT_POINTERS SectionObjectPointer,
PLARGE_INTEGER FileOffset, ULONG Length, PIO_STATUS_BLOCK IoStatus);
NTSTATUS FspQuerySecurityDescriptorInfo(SECURITY_INFORMATION SecurityInformation,
PSECURITY_DESCRIPTOR SecurityDescriptor, PULONG PLength,
PSECURITY_DESCRIPTOR ObjectsSecurityDescriptor);

72
src/sys/flush.c
View File

@ -9,20 +9,74 @@
static NTSTATUS FspFsvolFlushBuffers(
PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp);
FSP_IOCMPL_DISPATCH FspFsvolFlushBuffersComplete;
static FSP_IOP_REQUEST_FINI FspFsvolFlushBuffersRequestFini;
FSP_DRIVER_DISPATCH FspFlushBuffers;
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, FspFsvolFlushBuffers)
#pragma alloc_text(PAGE, FspFsvolFlushBuffersComplete)
#pragma alloc_text(PAGE, FspFsvolFlushBuffersRequestFini)
#pragma alloc_text(PAGE, FspFlushBuffers)
#endif
enum
{
/* FlushBuffers */
RequestFileNode = 0,
};
static NTSTATUS FspFsvolFlushBuffers(
PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp)
{
PAGED_CODE();
return STATUS_INVALID_DEVICE_REQUEST;
NTSTATUS Result;
FSP_FSCTL_TRANSACT_REQ *Request;
/* is this a valid FileObject? */
if (!FspFileNodeIsValid(IrpSp->FileObject->FsContext))
{
/* indicate that we are flushing the whole volume! */
Result = FspIopCreateRequest(Irp, 0, 0, &Request);
if (!NT_SUCCESS(Result))
return Result;
Request->Kind = FspFsctlTransactFlushBuffersKind;
return FSP_STATUS_IOQ_POST;
}
PFILE_OBJECT FileObject = IrpSp->FileObject;
FSP_FILE_NODE *FileNode = FileObject->FsContext;
FSP_FILE_DESC *FileDesc = FileObject->FsContext2;
IO_STATUS_BLOCK IoStatus;
ASSERT(FileNode == FileDesc->FileNode);
FspFileNodeAcquireExclusive(FileNode, Full);
Result = FspCcFlushCache(FileObject->SectionObjectPointer, 0, 0, &IoStatus);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
Result = FspIopCreateRequestEx(Irp, 0, 0, FspFsvolFlushBuffersRequestFini, &Request);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Full);
return Result;
}
Request->Kind = FspFsctlTransactFlushBuffersKind;
Request->Req.FlushBuffers.UserContext = FileNode->UserContext;
Request->Req.FlushBuffers.UserContext2 = FileDesc->UserContext2;
FspFileNodeSetOwner(FileNode, Full, Request);
FspIopRequestContext(Request, RequestFileNode) = FileNode;
return FSP_STATUS_IOQ_POST;
}
NTSTATUS FspFsvolFlushBuffersComplete(
@ -30,7 +84,18 @@ NTSTATUS FspFsvolFlushBuffersComplete(
{
FSP_ENTER_IOC(PAGED_CODE());
FSP_LEAVE_IOC("%s", "");
FSP_LEAVE_IOC("FileObject=%p",
IrpSp->FileObject);
}
static VOID FspFsvolFlushBuffersRequestFini(FSP_FSCTL_TRANSACT_REQ *Request, PVOID Context[4])
{
PAGED_CODE();
FSP_FILE_NODE *FileNode = Context[RequestFileNode];
if (0 != FileNode)
FspFileNodeReleaseOwner(FileNode, Full, Request);
}
NTSTATUS FspFlushBuffers(
@ -46,5 +111,6 @@ NTSTATUS FspFlushBuffers(
FSP_RETURN(Result = STATUS_INVALID_DEVICE_REQUEST);
}
FSP_LEAVE_MJ("%s", "");
FSP_LEAVE_MJ("FileObject=%p",
IrpSp->FileObject);
}

26
src/sys/util.c
View File

@ -29,6 +29,8 @@ 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);
NTSTATUS FspCcFlushCache(PSECTION_OBJECT_POINTERS SectionObjectPointer,
PLARGE_INTEGER FileOffset, ULONG Length, PIO_STATUS_BLOCK IoStatus);
NTSTATUS FspQuerySecurityDescriptorInfo(SECURITY_INFORMATION SecurityInformation,
PSECURITY_DESCRIPTOR SecurityDescriptor, PULONG PLength,
PSECURITY_DESCRIPTOR ObjectsSecurityDescriptor);
@ -83,6 +85,7 @@ VOID FspSafeMdlDelete(FSP_SAFE_MDL *SafeMdl);
#pragma alloc_text(PAGE, FspCcMdlReadComplete)
#pragma alloc_text(PAGE, FspCcPrepareMdlWrite)
#pragma alloc_text(PAGE, FspCcMdlWriteComplete)
#pragma alloc_text(PAGE, FspCcFlushCache)
#pragma alloc_text(PAGE, FspQuerySecurityDescriptorInfo)
#pragma alloc_text(PAGE, FspNotifyInitializeSync)
#pragma alloc_text(PAGE, FspNotifyFullChangeDirectory)
@ -528,6 +531,29 @@ NTSTATUS FspCcMdlWriteComplete(PFILE_OBJECT FileObject, PLARGE_INTEGER FileOffse
}
}
NTSTATUS FspCcFlushCache(PSECTION_OBJECT_POINTERS SectionObjectPointer,
PLARGE_INTEGER FileOffset, ULONG Length, PIO_STATUS_BLOCK IoStatus)
{
PAGED_CODE();
NTSTATUS Result;
try
{
CcFlushCache(SectionObjectPointer, FileOffset, Length, IoStatus);
Result = IoStatus->Status;
}
except (EXCEPTION_EXECUTE_HANDLER)
{
Result = GetExceptionCode();
IoStatus->Information = 0;
IoStatus->Status = Result;
}
return Result;
}
NTSTATUS FspQuerySecurityDescriptorInfo(SECURITY_INFORMATION SecurityInformation,
PSECURITY_DESCRIPTOR SecurityDescriptor, PULONG PLength,
PSECURITY_DESCRIPTOR ObjectsSecurityDescriptor)