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dll: FSP_FILE_SYSTEM

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This commit is contained in:
Bill Zissimopoulos 2016-01-03 14:50:23 -08:00
parent f1d75a2653
commit 4429955506
3 changed files with 40 additions and 15 deletions
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37
inc/winfsp/winfsp.h
View File

@ -27,6 +27,13 @@
typedef struct _FSP_FILE_SYSTEM FSP_FILE_SYSTEM;
typedef VOID FSP_FILE_SYSTEM_DISPATCHER(FSP_FILE_SYSTEM *, FSP_FSCTL_TRANSACT_REQ *);
typedef NTSTATUS FSP_FILE_SYSTEM_OPERATION(FSP_FILE_SYSTEM *, FSP_FSCTL_TRANSACT_REQ *);
typedef struct _FSP_FILE_SYSTEM_INTERFACE
{
NTSTATUS (*AccessCheck)(FSP_FILE_SYSTEM *,
FSP_FSCTL_TRANSACT_REQ *, DWORD, PDWORD);
NTSTATUS (*QuerySecurity)(FSP_FILE_SYSTEM *,
PWSTR, SECURITY_INFORMATION, PSECURITY_DESCRIPTOR, SIZE_T *);
} FSP_FILE_SYSTEM_INTERFACE;
typedef struct _FSP_FILE_SYSTEM
{
UINT16 Version;
@ -37,31 +44,41 @@ typedef struct _FSP_FILE_SYSTEM
FSP_FILE_SYSTEM_DISPATCHER *Dispatcher;
FSP_FILE_SYSTEM_DISPATCHER *EnterOperation, *LeaveOperation;
FSP_FILE_SYSTEM_OPERATION *Operations[FspFsctlTransactKindCount];
NTSTATUS (*AccessCheck)(FSP_FILE_SYSTEM *,
FSP_FSCTL_TRANSACT_REQ *, DWORD, PDWORD);
NTSTATUS (*QuerySecurity)(FSP_FILE_SYSTEM *,
PWSTR, SECURITY_INFORMATION, PSECURITY_DESCRIPTOR, SIZE_T *);
const FSP_FILE_SYSTEM_INTERFACE *Interface;
} FSP_FILE_SYSTEM;
FSP_API NTSTATUS FspFileSystemCreate(PWSTR DevicePath,
const FSP_FSCTL_VOLUME_PARAMS *VolumeParams,
FSP_FILE_SYSTEM_DISPATCHER *Dispatcher,
const FSP_FILE_SYSTEM_INTERFACE *Interface,
FSP_FILE_SYSTEM **PFileSystem);
FSP_API VOID FspFileSystemDelete(FSP_FILE_SYSTEM *FileSystem);
FSP_API NTSTATUS FspFileSystemLoop(FSP_FILE_SYSTEM *FileSystem);
FSP_API VOID FspFileSystemDirectDispatcher(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request);
FSP_API VOID FspFileSystemPoolDispatcher(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request);
static inline
VOID FspFileSystemSetDispatcher(FSP_FILE_SYSTEM *FileSystem,
FSP_FILE_SYSTEM_DISPATCHER *Dispatcher,
FSP_FILE_SYSTEM_DISPATCHER *EnterOperation,
FSP_FILE_SYSTEM_DISPATCHER *LeaveOperation)
{
FileSystem->Dispatcher = Dispatcher;
FileSystem->EnterOperation = EnterOperation;
FileSystem->LeaveOperation = LeaveOperation;
}
static VOID FspFileSystemGetDispatcherResult(FSP_FILE_SYSTEM *FileSystem,
static inline
VOID FspFileSystemGetDispatcherResult(FSP_FILE_SYSTEM *FileSystem,
NTSTATUS *PDispatcherResult)
{
/* 32-bit reads are atomic */
*PDispatcherResult = FileSystem->DispatcherResult;
MemoryBarrier();
}
static VOID FspFileSystemSetDispatcherResult(FSP_FILE_SYSTEM *FileSystem,
static inline
VOID FspFileSystemSetDispatcherResult(FSP_FILE_SYSTEM *FileSystem,
NTSTATUS DispatcherResult)
{
if (NT_SUCCESS(DispatcherResult))
@ -69,13 +86,15 @@ static VOID FspFileSystemSetDispatcherResult(FSP_FILE_SYSTEM *FileSystem,
InterlockedCompareExchange(&FileSystem->DispatcherResult, DispatcherResult, 0);
}
static VOID FspFileSystemEnterOperation(FSP_FILE_SYSTEM *FileSystem,
static inline
VOID FspFileSystemEnterOperation(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request)
{
if (0 != FileSystem->EnterOperation)
FileSystem->EnterOperation(FileSystem, Request);
}
static VOID FspFileSystemLeaveOperation(FSP_FILE_SYSTEM *FileSystem,
static inline
VOID FspFileSystemLeaveOperation(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request)
{
if (0 != FileSystem->LeaveOperation)

8
src/dll/access.c
View File

@ -24,7 +24,7 @@ static NTSTATUS FspGetFileSecurityDescriptor(FSP_FILE_SYSTEM *FileSystem,
{
for (;;)
{
NTSTATUS Result = FileSystem->QuerySecurity(FileSystem,
NTSTATUS Result = FileSystem->Interface->QuerySecurity(FileSystem,
FileName,
OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION,
*PSecurityDescriptor, PSecurityDescriptorSize);
@ -42,10 +42,10 @@ FSP_API NTSTATUS FspAccessCheck(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request, BOOLEAN AllowTraverseCheck, DWORD DesiredAccess,
PDWORD PGrantedAccess)
{
if (0 != FileSystem->AccessCheck)
return FileSystem->AccessCheck(FileSystem, Request, DesiredAccess, PGrantedAccess);
if (0 != FileSystem->Interface->AccessCheck)
return FileSystem->Interface->AccessCheck(FileSystem, Request, DesiredAccess, PGrantedAccess);
if (0 == FileSystem->QuerySecurity)
if (0 == FileSystem->Interface->QuerySecurity)
{
*PGrantedAccess = DesiredAccess;
return STATUS_SUCCESS;

10
src/dll/loop.c
View File

@ -14,7 +14,7 @@ typedef struct _FSP_DISPATCHER_WORK_ITEM
FSP_API NTSTATUS FspFileSystemCreate(PWSTR DevicePath,
const FSP_FSCTL_VOLUME_PARAMS *VolumeParams,
FSP_FILE_SYSTEM_DISPATCHER *Dispatcher,
const FSP_FILE_SYSTEM_INTERFACE *Interface,
FSP_FILE_SYSTEM **PFileSystem)
{
NTSTATUS Result;
@ -22,6 +22,9 @@ FSP_API NTSTATUS FspFileSystemCreate(PWSTR DevicePath,
*PFileSystem = 0;
if (0 == Interface)
return STATUS_INVALID_PARAMETER;
FileSystem = MemAlloc(sizeof *FileSystem);
if (0 == FileSystem)
return STATUS_INSUFFICIENT_RESOURCES;
@ -36,7 +39,10 @@ FSP_API NTSTATUS FspFileSystemCreate(PWSTR DevicePath,
return Result;
}
FileSystem->Dispatcher = 0 != Dispatcher ? Dispatcher : FspFileSystemDirectDispatcher;
FileSystem->Dispatcher = FspFileSystemDirectDispatcher;
FileSystem->Operations[FspFsctlTransactCreateKind] = 0;
// !!!: ...
FileSystem->Interface = Interface;
*PFileSystem = FileSystem;