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symlink: FSCTL_GET_REPARSE_POINT

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driver handles FSCTL_GET_REPARSE_POINT by sending a symlink query upcall
daemon handles symlink query upcall by calling nfs41_readlink()

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
This commit is contained in:
Casey Bodley 2010-09-23 12:48:02 -04:00 • committed by unknown
parent 8ea0ca1893
commit 08c2618551
2 changed files with 144 additions and 2 deletions
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112
sys/nfs41_driver.c
View file

@ -4228,14 +4228,124 @@ out:
return status;
}
static NTSTATUS map_symlink_errors(NTSTATUS status)
{
switch (status) {
case NO_ERROR: return STATUS_SUCCESS;
case ERROR_INVALID_REPARSE_DATA: return STATUS_IO_REPARSE_DATA_INVALID;
case ERROR_NOT_A_REPARSE_POINT: return STATUS_NOT_A_REPARSE_POINT;
case ERROR_OUTOFMEMORY: return STATUS_INSUFFICIENT_RESOURCES;
case ERROR_INSUFFICIENT_BUFFER: return STATUS_BUFFER_TOO_SMALL;
case STATUS_BUFFER_TOO_SMALL:
case ERROR_BUFFER_OVERFLOW: return STATUS_BUFFER_OVERFLOW;
default:
DbgP("failed to map windows error %d to NTSTATUS; "
"defaulting to STATUS_INVALID_NETWORK_RESPONSE\n", status);
case ERROR_BAD_NET_RESP: return STATUS_INVALID_NETWORK_RESPONSE;
}
}
static void print_reparse_buffer(PREPARSE_DATA_BUFFER Reparse)
{
UNICODE_STRING name;
DbgP("ReparseTag: %08X\n", Reparse->ReparseTag);
DbgP("ReparseDataLength: %8u\n", Reparse->ReparseDataLength);
DbgP("Reserved: %8u\n", Reparse->Reserved);
DbgP("SubstituteNameOffset: %8u\n", Reparse->SymbolicLinkReparseBuffer.SubstituteNameOffset);
DbgP("SubstituteNameLength: %8u\n", Reparse->SymbolicLinkReparseBuffer.SubstituteNameLength);
DbgP("PrintNameOffset: %8u\n", Reparse->SymbolicLinkReparseBuffer.PrintNameOffset);
DbgP("PrintNameLength: %8u\n", Reparse->SymbolicLinkReparseBuffer.PrintNameLength);
DbgP("Flags: %08X\n", Reparse->SymbolicLinkReparseBuffer.Flags);
name.Buffer = &Reparse->SymbolicLinkReparseBuffer.PathBuffer[
Reparse->SymbolicLinkReparseBuffer.SubstituteNameOffset/sizeof(WCHAR)];
name.MaximumLength = name.Length =
Reparse->SymbolicLinkReparseBuffer.SubstituteNameLength;
DbgP("SubstituteName: %wZ\n", &name);
name.Buffer = &Reparse->SymbolicLinkReparseBuffer.PathBuffer[
Reparse->SymbolicLinkReparseBuffer.PrintNameOffset/sizeof(WCHAR)];
name.MaximumLength = name.Length =
Reparse->SymbolicLinkReparseBuffer.PrintNameLength;
DbgP("PrintName: %wZ\n", &name);
}
static NTSTATUS nfs41_GetReparsePoint(
IN OUT PRX_CONTEXT RxContext)
{
UNICODE_STRING TargetName;
XXCTL_LOWIO_COMPONENT *FsCtl = &RxContext->LowIoContext.ParamsFor.FsCtl;
PNFS41_FOBX Fobx = NFS41GetFileObjectExtension(RxContext->pFobx);
PMRX_SRV_OPEN SrvOpen = RxContext->pRelevantSrvOpen;
PNFS41_V_NET_ROOT_EXTENSION VNetRoot = NFS41GetVNetRootExtension(SrvOpen->pVNetRoot);
nfs41_updowncall_entry *entry;
const USHORT HeaderLen = FIELD_OFFSET(REPARSE_DATA_BUFFER,
SymbolicLinkReparseBuffer.PathBuffer);
NTSTATUS status;
if (FsCtl->OutputBufferLength < HeaderLen) {
RxContext->InformationToReturn = HeaderLen;
status = STATUS_BUFFER_TOO_SMALL;
goto out;
}
TargetName.Buffer = (PWCH)((PBYTE)FsCtl->pOutputBuffer + HeaderLen);
TargetName.MaximumLength = (USHORT)min(FsCtl->OutputBufferLength - HeaderLen, 0xFFFF);
status = nfs41_UpcallCreate(NFS41_SYMLINK, &entry);
if (status)
goto out;
entry->u.Symlink.session = VNetRoot->session;
entry->u.Symlink.open_state = Fobx->nfs41_open_state;
entry->u.Symlink.filename = SrvOpen->pAlreadyPrefixedName;
entry->u.Symlink.target = &TargetName;
entry->u.Symlink.set = FALSE;
if (nfs41_UpcallWaitForReply(entry) != STATUS_SUCCESS) {
status = STATUS_INTERNAL_ERROR;
goto out;
}
status = map_symlink_errors(entry->status);
if (status == STATUS_SUCCESS) {
/* fill in the output buffer */
PREPARSE_DATA_BUFFER Reparse = (PREPARSE_DATA_BUFFER)FsCtl->pOutputBuffer;
Reparse->ReparseTag = IO_REPARSE_TAG_SYMLINK;
Reparse->ReparseDataLength = HeaderLen + TargetName.Length -
REPARSE_DATA_BUFFER_HEADER_SIZE;
Reparse->Reserved = 0;
Reparse->SymbolicLinkReparseBuffer.Flags = SYMLINK_FLAG_RELATIVE;
/* PrintName and SubstituteName point to the same string */
Reparse->SymbolicLinkReparseBuffer.SubstituteNameOffset = 0;
Reparse->SymbolicLinkReparseBuffer.SubstituteNameLength = TargetName.Length;
Reparse->SymbolicLinkReparseBuffer.PrintNameOffset = 0;
Reparse->SymbolicLinkReparseBuffer.PrintNameLength = TargetName.Length;
print_reparse_buffer(Reparse);
RxContext->IoStatusBlock.Information = HeaderLen + TargetName.Length;
} else if (status == STATUS_BUFFER_TOO_SMALL) {
RxContext->InformationToReturn = HeaderLen + TargetName.Length;
}
RxFreePool(entry);
out:
return status;
}
NTSTATUS nfs41_FsCtl(
IN OUT PRX_CONTEXT RxContext)
{
NTSTATUS status = STATUS_INVALID_DEVICE_REQUEST;
DbgEn();
DbgP("FileName: %wZ\n", &RxContext->CurrentIrpSp->FileObject->FileName);
switch (RxContext->LowIoContext.ParamsFor.FsCtl.FsControlCode) {
case FSCTL_GET_REPARSE_POINT:
DbgP("FSCTL_GET_REPARSE_POINT\n");
status = nfs41_GetReparsePoint(RxContext);
break;
}
DbgEx();
return status;
}
NTSTATUS nfs41_IoCtl(