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tst: passthrough file system: WIP

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This commit is contained in:
Bill Zissimopoulos 2017-01-20 10:38:31 -08:00
parent 61a001baf1
commit 117ab9c3e4
1 changed files with 70 additions and 4 deletions
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74
tst/passthrough/passthrough.c
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@ -147,7 +147,42 @@ static NTSTATUS Create(FSP_FILE_SYSTEM *FileSystem,
UINT32 FileAttributes, PSECURITY_DESCRIPTOR SecurityDescriptor, UINT64 AllocationSize,
PVOID *PFileContext, FSP_FSCTL_FILE_INFO *FileInfo)
{
return STATUS_INVALID_DEVICE_REQUEST;
PTFS *Ptfs = (PTFS *)FileSystem->UserContext;
WCHAR FullPath[FULLPATH_SIZE];
SECURITY_ATTRIBUTES SecurityAttributes;
ULONG CreateDirectory;
HANDLE Handle;
if (!ConcatPath(Ptfs, FileName, FullPath))
return STATUS_OBJECT_NAME_INVALID;
SecurityAttributes.nLength = sizeof SecurityAttributes;
SecurityAttributes.lpSecurityDescriptor = SecurityDescriptor;
SecurityAttributes.bInheritHandle = FALSE;
/*
* It is not widely known but CreateFile can be used to create directories!
* It requires the specification of both FILE_FLAG_BACKUP_SEMANTICS and
* FILE_FLAG_POSIX_SEMANTICS. It also requires that FileAttributes has
* FILE_ATTRIBUTE_DIRECTORY set.
*/
CreateDirectory = (CreateOptions & FILE_DIRECTORY_FILE) ? FILE_FLAG_POSIX_SEMANTICS : 0;
if (CreateDirectory)
FileAttributes |= FILE_ATTRIBUTE_DIRECTORY;
else
FileAttributes &= ~FILE_ATTRIBUTE_DIRECTORY;
if (0 == FileAttributes)
FileAttributes = FILE_ATTRIBUTE_NORMAL;
Handle = CreateFileW(FullPath,
GrantedAccess, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, &SecurityAttributes,
CREATE_NEW, FileAttributes | CreateDirectory | FILE_FLAG_BACKUP_SEMANTICS, 0);
if (INVALID_HANDLE_VALUE == Handle)
return FspNtStatusFromWin32(GetLastError());
*PFileContext = Handle;
return GetFileInfoInternal(Handle, FileInfo);
}
static NTSTATUS Open(FSP_FILE_SYSTEM *FileSystem,
@ -176,7 +211,38 @@ static NTSTATUS Overwrite(FSP_FILE_SYSTEM *FileSystem,
PVOID FileContext, UINT32 FileAttributes, BOOLEAN ReplaceFileAttributes, UINT64 AllocationSize,
FSP_FSCTL_FILE_INFO *FileInfo)
{
return STATUS_INVALID_DEVICE_REQUEST;
HANDLE Handle = FileContext;
FILE_BASIC_INFO BasicInfo = { 0 };
FILE_ALLOCATION_INFO AllocationInfo = { 0 };
FILE_ATTRIBUTE_TAG_INFO AttributeTagInfo;
if (ReplaceFileAttributes)
{
BasicInfo.FileAttributes = FileAttributes;
if (!SetFileInformationByHandle(Handle,
FileBasicInfo, &BasicInfo, sizeof BasicInfo))
return FspNtStatusFromWin32(GetLastError());
}
else if (0 != FileAttributes)
{
if (!GetFileInformationByHandleEx(Handle,
FileAttributeTagInfo, &AttributeTagInfo, sizeof AttributeTagInfo))
return FspNtStatusFromWin32(GetLastError());
BasicInfo.FileAttributes = FileAttributes | AttributeTagInfo.FileAttributes;
if (BasicInfo.FileAttributes ^ FileAttributes)
{
if (!SetFileInformationByHandle(Handle,
FileBasicInfo, &BasicInfo, sizeof BasicInfo))
return FspNtStatusFromWin32(GetLastError());
}
}
if (!SetFileInformationByHandle(Handle,
FileAllocationInfo, &AllocationInfo, sizeof AllocationInfo))
return FspNtStatusFromWin32(GetLastError());
return GetFileInfoInternal(Handle, FileInfo);
}
static VOID Cleanup(FSP_FILE_SYSTEM *FileSystem,
@ -332,7 +398,7 @@ static NTSTATUS ReadDirectory(FSP_FILE_SYSTEM *FileSystem,
*/
/*
* The simple conditional `Offset > NextOffset++` only works when files
* The simple conditional `Offset <= NextOffset++` only works when files
* are not created/deleted in the directory while it is being read.
* This is perhaps ok for this sample file system, but a "real" file
* system would probably have to handle this better.
@ -344,7 +410,7 @@ static NTSTATUS ReadDirectory(FSP_FILE_SYSTEM *FileSystem,
*
* The easiest method to achieve this is to buffer all directory contents
* in a call to ReadDirectory with Offset == 0 and then return offsets
* within the directory content buffer. Subsequent ReadDirectory operation
* within the directory content buffer. Subsequent ReadDirectory operations
* return directory contents directly from the buffer.
*/