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Implement RxPrepareToReparseSymbolicLink().
This allows symbolic links to work on a NFS share, we can now follow links that would have been exported by the server.

Safe to merge.

CORE-8204
CORE-11327
CORE-13615

svn path=/trunk/; revision=75451
This commit is contained in:
Pierre Schweitzer 2017-07-30 12:24:26 +00:00
parent f9df6b72bf
commit e4cfb86b3e
1 changed files with 71 additions and 2 deletions
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73
reactos/sdk/lib/drivers/rdbsslib/rdbss.c
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@ -7492,6 +7492,9 @@ Leave:
return Status;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
RxPrepareToReparseSymbolicLink(
@ -7501,8 +7504,74 @@ RxPrepareToReparseSymbolicLink(
BOOLEAN NewPathIsAbsolute,
PBOOLEAN ReparseRequired)
{
UNIMPLEMENTED;
return STATUS_NOT_IMPLEMENTED;
PWSTR NewBuffer;
USHORT NewLength;
PFILE_OBJECT FileObject;
/* Assume no reparse is required first */
*ReparseRequired = FALSE;
/* Only supported for IRP_MJ_CREATE */
if (RxContext->MajorFunction != IRP_MJ_CREATE)
{
return STATUS_INVALID_PARAMETER;
}
/* If symbolic link is not embedded, and DELETE is specified, fail */
if (!SymbolicLinkEmbeddedInOldPath)
{
/* Excepted if DELETE is the only flag specified, then, open has to succeed
* See: https://msdn.microsoft.com/en-us/library/windows/hardware/ff554649(v=vs.85).aspx (remarks)
*/
if (BooleanFlagOn(RxContext->Create.NtCreateParameters.DesiredAccess, DELETE) &&
BooleanFlagOn(RxContext->Create.NtCreateParameters.DesiredAccess, ~DELETE))
{
return STATUS_ACCESS_DENIED;
}
}
/* At that point, assume reparse will be required */
*ReparseRequired = TRUE;
/* If new path isn't absolute, it's up to us to make it absolute */
if (!NewPathIsAbsolute)
{
/* The prefix will be \Device\Mup */
NewLength = NewPath->Length + (sizeof(L"\\Device\\Mup") - sizeof(UNICODE_NULL));
NewBuffer = ExAllocatePoolWithTag(PagedPool | POOL_COLD_ALLOCATION, NewLength,
RX_MISC_POOLTAG);
if (NewBuffer == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Copy data for the new path */
RtlMoveMemory(NewBuffer, L"\\Device\\Mup", (sizeof(L"\\Device\\Mup") - sizeof(UNICODE_NULL)));
RtlMoveMemory(Add2Ptr(NewBuffer, (sizeof(L"\\Device\\Mup") - sizeof(UNICODE_NULL))),
NewPath->Buffer, NewPath->Length);
}
/* Otherwise, use caller path as it */
else
{
NewLength = NewPath->Length;
NewBuffer = NewPath->Buffer;
}
/* Get the FILE_OBJECT we'll modify */
FileObject = RxContext->CurrentIrpSp->FileObject;
/* Free old path first */
ExFreePoolWithTag(FileObject->FileName.Buffer, 0);
/* And setup new one */
FileObject->FileName.Length = NewLength;
FileObject->FileName.MaximumLength = NewLength;
FileObject->FileName.Buffer = NewBuffer;
/* And set reparse flag */
SetFlag(RxContext->Create.Flags, RX_CONTEXT_CREATE_FLAG_REPARSE);
/* Done! */
return STATUS_SUCCESS;
}
/*