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dll: fuse: use NFS reparse points for POSIX special files

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This commit is contained in:
Bill Zissimopoulos
2016-09-08 10:43:01 -07:00
parent 28931f4687
commit 44c86ff9a4
7 changed files with 343 additions and 223 deletions
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149
src/dll/fsop.c
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@ -887,8 +887,8 @@ FSP_API NTSTATUS FspFileSystemOpFileSystemControl(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response)
{
NTSTATUS Result;
PREPARSE_DATA_BUFFER GetReparseData, SetReparseData;
SIZE_T Offset, Size;
PREPARSE_DATA_BUFFER ReparseData;
SIZE_T Size;
Result = STATUS_INVALID_DEVICE_REQUEST;
switch (Request->Req.FileSystemControl.FsControlCode)
@ -896,104 +896,41 @@ FSP_API NTSTATUS FspFileSystemOpFileSystemControl(FSP_FILE_SYSTEM *FileSystem,
case FSCTL_GET_REPARSE_POINT:
if (0 != FileSystem->Interface->GetReparsePoint)
{
GetReparseData = (PREPARSE_DATA_BUFFER)Response->Buffer;
memset(GetReparseData, 0, sizeof *GetReparseData);
ReparseData = (PREPARSE_DATA_BUFFER)Response->Buffer;
memset(ReparseData, 0, sizeof *ReparseData);
if (FileSystem->ReparsePointsSymlinkOnly)
{
Size = FSP_FSCTL_TRANSACT_RSP_SIZEMAX - FIELD_OFFSET(FSP_FSCTL_TRANSACT_RSP, Buffer) -
FIELD_OFFSET(REPARSE_DATA_BUFFER, SymbolicLinkReparseBuffer.PathBuffer);
Result = FileSystem->Interface->GetReparsePoint(FileSystem, Request,
(PVOID)Request->Req.FileSystemControl.UserContext,
(PWSTR)Request->Buffer,
GetReparseData->SymbolicLinkReparseBuffer.PathBuffer,
&Size);
if (NT_SUCCESS(Result))
{
Offset = 0;
if (Size > 4 * sizeof(WCHAR) &&
'\\' == GetReparseData->SymbolicLinkReparseBuffer.PathBuffer[0] &&
'?' == GetReparseData->SymbolicLinkReparseBuffer.PathBuffer[1] &&
'?' == GetReparseData->SymbolicLinkReparseBuffer.PathBuffer[2] &&
'\\' == GetReparseData->SymbolicLinkReparseBuffer.PathBuffer[3])
Offset = 4 * sizeof(WCHAR);
GetReparseData->ReparseTag = IO_REPARSE_TAG_SYMLINK;
GetReparseData->ReparseDataLength = (USHORT)(
FIELD_OFFSET(REPARSE_DATA_BUFFER, SymbolicLinkReparseBuffer.PathBuffer) -
FIELD_OFFSET(REPARSE_DATA_BUFFER, SymbolicLinkReparseBuffer) +
Size);
GetReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset = 0;
GetReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength = (USHORT)Size;
GetReparseData->SymbolicLinkReparseBuffer.PrintNameOffset = (USHORT)Offset;
GetReparseData->SymbolicLinkReparseBuffer.PrintNameLength = (USHORT)(Size - Offset);
GetReparseData->SymbolicLinkReparseBuffer.Flags = 0 == Offset ?
0 : SYMLINK_FLAG_RELATIVE;
Response->Rsp.FileSystemControl.Buffer.Size = (UINT16)(
FIELD_OFFSET(REPARSE_DATA_BUFFER, SymbolicLinkReparseBuffer.PathBuffer) +
Size);
}
}
else
{
Size = FSP_FSCTL_TRANSACT_RSP_SIZEMAX - FIELD_OFFSET(FSP_FSCTL_TRANSACT_RSP, Buffer);
Result = FileSystem->Interface->GetReparsePoint(FileSystem, Request,
(PVOID)Request->Req.FileSystemControl.UserContext,
(PWSTR)Request->Buffer, GetReparseData, &Size);
if (NT_SUCCESS(Result))
Response->Rsp.FileSystemControl.Buffer.Size = (UINT16)Size;
}
Size = FSP_FSCTL_TRANSACT_RSP_SIZEMAX - FIELD_OFFSET(FSP_FSCTL_TRANSACT_RSP, Buffer);
Result = FileSystem->Interface->GetReparsePoint(FileSystem, Request,
(PVOID)Request->Req.FileSystemControl.UserContext,
(PWSTR)Request->Buffer, ReparseData, &Size);
if (NT_SUCCESS(Result))
Response->Rsp.FileSystemControl.Buffer.Size = (UINT16)Size;
}
break;
case FSCTL_SET_REPARSE_POINT:
if (0 != FileSystem->Interface->SetReparsePoint)
{
SetReparseData = (PREPARSE_DATA_BUFFER)
ReparseData = (PREPARSE_DATA_BUFFER)
(Request->Buffer + Request->Req.FileSystemControl.Buffer.Offset);
if (FileSystem->ReparsePointsSymlinkOnly)
{
if (IO_REPARSE_TAG_SYMLINK == *(PULONG)SetReparseData)
Result = FileSystem->Interface->SetReparsePoint(FileSystem, Request,
(PVOID)Request->Req.FileSystemControl.UserContext,
(PWSTR)Request->Buffer,
SetReparseData->SymbolicLinkReparseBuffer.PathBuffer +
SetReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(WCHAR),
SetReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength);
else
Result = STATUS_IO_REPARSE_TAG_MISMATCH;
}
else
Result = FileSystem->Interface->SetReparsePoint(FileSystem, Request,
(PVOID)Request->Req.FileSystemControl.UserContext,
(PWSTR)Request->Buffer,
SetReparseData,
Request->Req.FileSystemControl.Buffer.Size);
Result = FileSystem->Interface->SetReparsePoint(FileSystem, Request,
(PVOID)Request->Req.FileSystemControl.UserContext,
(PWSTR)Request->Buffer,
ReparseData,
Request->Req.FileSystemControl.Buffer.Size);
}
break;
case FSCTL_DELETE_REPARSE_POINT:
if (0 != FileSystem->Interface->DeleteReparsePoint)
{
SetReparseData = (PREPARSE_DATA_BUFFER)
ReparseData = (PREPARSE_DATA_BUFFER)
(Request->Buffer + Request->Req.FileSystemControl.Buffer.Offset);
if (FileSystem->ReparsePointsSymlinkOnly)
{
if (IO_REPARSE_TAG_SYMLINK == *(PULONG)SetReparseData)
Result = FileSystem->Interface->DeleteReparsePoint(FileSystem, Request,
(PVOID)Request->Req.FileSystemControl.UserContext,
(PWSTR)Request->Buffer,
0, 0);
else
Result = STATUS_IO_REPARSE_TAG_MISMATCH;
}
else
Result = FileSystem->Interface->DeleteReparsePoint(FileSystem, Request,
(PVOID)Request->Req.FileSystemControl.UserContext,
(PWSTR)Request->Buffer,
SetReparseData,
Request->Req.FileSystemControl.Buffer.Size);
Result = FileSystem->Interface->DeleteReparsePoint(FileSystem, Request,
(PVOID)Request->Req.FileSystemControl.UserContext,
(PWSTR)Request->Buffer,
ReparseData,
Request->Req.FileSystemControl.Buffer.Size);
}
break;
}
@ -1184,18 +1121,9 @@ FSP_API NTSTATUS FspFileSystemResolveReparsePoints(FSP_FILE_SYSTEM *FileSystem,
c = *p;
*p = L'\0';
if (FileSystem->ReparsePointsSymlinkOnly)
{
Size = FSP_FSCTL_TRANSACT_PATH_SIZEMAX;
Result = GetReparsePointByName(FileSystem, Context, TargetPath, '\0' != c,
ReparseData->SymbolicLinkReparseBuffer.PathBuffer, &Size);
}
else
{
Size = sizeof ReparseDataBuf;
Result = GetReparsePointByName(FileSystem, Context, TargetPath, '\0' != c,
ReparseData, &Size);
}
Size = sizeof ReparseDataBuf;
Result = GetReparsePointByName(FileSystem, Context, TargetPath, '\0' != c,
ReparseData, &Size);
*p = c;
if (STATUS_NOT_A_REPARSE_POINT == Result)
@ -1213,25 +1141,20 @@ FSP_API NTSTATUS FspFileSystemResolveReparsePoints(FSP_FILE_SYSTEM *FileSystem,
if (0 == --MaxTries)
return STATUS_REPARSE_POINT_NOT_RESOLVED;
if (FileSystem->ReparsePointsSymlinkOnly)
TargetLink = ReparseData->SymbolicLinkReparseBuffer.PathBuffer;
if (IO_REPARSE_TAG_SYMLINK == ReparseData->ReparseTag)
{
TargetLink = ReparseData->SymbolicLinkReparseBuffer.PathBuffer +
ReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset;
Size = ReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength;
}
else
{
if (IO_REPARSE_TAG_SYMLINK == ReparseData->ReparseTag)
{
TargetLink = ReparseData->SymbolicLinkReparseBuffer.PathBuffer +
ReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset;
Size = ReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength;
}
else
{
/* not a symlink; return the full reparse point! */
if (Size > *PSize)
return STATUS_OBJECT_NAME_INVALID;
memcpy(Buffer, ReparseData, Size);
/* not a symlink; return the full reparse point! */
if (Size > *PSize)
return STATUS_OBJECT_NAME_INVALID;
memcpy(Buffer, ReparseData, Size);
goto no_symlink_exit;
}
goto no_symlink_exit;
}
if (Size > 4 * sizeof(WCHAR) &&