r3081: several updates to ntvfs and server side async request handling in

preparation for the full share modes and ntcreatex code that I am
working on.

highlights include:

 - changed the way a backend determines if it is allowed to process a
   request asynchronously. The previous method of looking at the
   send_fn caused problems when an intermediate ntvfs module disabled
   it, and the caller then wanted to finished processing using this
   function. The new method is a REQ_CONTROL_MAY_ASYNC flag in
   req->control_flags, which is also a bit easier to read

 - fixed 2 bugs in the readbraw server code. One related to trying to
   answer a readbraw with smb signing (which can't work, and crashed
   our signing code), the second related to error handling, which
   attempted to send a normal SMB error packet, when readbraw must
   send a 0 read reply (as it has no header)

 - added several more ntvfs_generic.c generic mapping functions. This
   means that backends no longer need to implement such esoteric
   functions as SMBwriteunlock() if they don't want to. The backend
   can just request the mapping layer turn it into a write followed by
   an unlock. This makes the backends considerably simpler as they
   only need to implement one style of each function for lock, read,
   write, open etc, rather than the full host of functions that SMB
   provides. A backend can still choose to implement them
   individually, of course, and the CIFS backend does that.

 - simplified the generic structures to make them identical to the
   principal call for several common SMB calls (such as
   RAW_WRITE_GENERIC now being an alias for RAW_WRITE_WRITEX).

 - started rewriting the pvfs_open() code in preparation for the full
   ntcreatex semantics.

 - in pvfs_open and ipc_open, initially allocate the open file
   structure as a child of the request, so on error we don't need to
   clean up. Then when we are going to succeed the open steal the
   pointer into the long term backend context. This makes for much
   simpler error handling (and fixes some bugs)

 - use a destructor in the ipc backend to make sure that everthing is
   cleaned up on receive error conditions.

 - switched the ipc backend to using idtree for fnum allocation

 - in the ntvfs_generic mapping routines, use a allocated secondary
   structure not a stack structure to ensure the request pointer
   remains valid even if the backend replies async.
(This used to be commit 3457c1836c09c82956697eb21627dfa2ed37682e)

1 files changed, 29 insertions, 55 deletions

diff --git a/source4/ntvfs/posix/pvfs_write.c b/source4/ntvfs/posix/pvfs_write.c
index 80a3dae3a7..8bbb4f8605 100644
--- a/source4/ntvfs/posix/pvfs_write.c
+++ b/source4/ntvfs/posix/pvfs_write.c
@@ -35,63 +35,37 @@ NTSTATUS pvfs_write(struct ntvfs_module_context *ntvfs,
 	struct pvfs_file *f;
 	NTSTATUS status;
 
-	switch (wr->generic.level) {
-	case RAW_WRITE_WRITEX:
-		f = pvfs_find_fd(pvfs, req, wr->writex.in.fnum);
-		if (!f) {
-			return NT_STATUS_INVALID_HANDLE;
-		}
-		status = pvfs_check_lock(pvfs, f, req->smbpid, 
-					 wr->writex.in.offset,
-					 wr->writex.in.count,
-					 WRITE_LOCK);
-		if (!NT_STATUS_IS_OK(status)) {
-			return status;
-		}
-
-		ret = pwrite(f->fd, 
-			     wr->writex.in.data, 
-			     wr->writex.in.count,
-			     wr->writex.in.offset);
-		if (ret == -1) {
-			return map_nt_error_from_unix(errno);
-		}
-		
-		wr->writex.out.nwritten = ret;
-		wr->writex.out.remaining = 0; /* should fill this in? */
-
-		return NT_STATUS_OK;
-
-	case RAW_WRITE_WRITE:
-		f = pvfs_find_fd(pvfs, req, wr->write.in.fnum);
-		if (!f) {
-			return NT_STATUS_INVALID_HANDLE;
-		}
-		if (wr->write.in.count == 0) {
-			/* a truncate! */
-			ret = ftruncate(f->fd, wr->write.in.offset);
-		} else {
-			status = pvfs_check_lock(pvfs, f, req->smbpid, 
-						 wr->write.in.offset,
-						 wr->write.in.count,
-						 WRITE_LOCK);
-			if (!NT_STATUS_IS_OK(status)) {
-				return status;
-			}
+	if (wr->generic.level != RAW_WRITE_WRITEX) {
+		return ntvfs_map_write(req, wr, ntvfs);
+	}
 
-			ret = pwrite(f->fd,
-				     wr->write.in.data, 
-				     wr->write.in.count,
-				     wr->write.in.offset);
-		}
-		if (ret == -1) {
-			return pvfs_map_errno(pvfs, errno);
-		}
-		
-		wr->write.out.nwritten = ret;
+	f = pvfs_find_fd(pvfs, req, wr->writex.in.fnum);
+	if (!f) {
+		return NT_STATUS_INVALID_HANDLE;
+	}
 
-		return NT_STATUS_OK;
+	if (f->name->dos.attrib & FILE_ATTRIBUTE_DIRECTORY) {
+		return NT_STATUS_FILE_IS_A_DIRECTORY;
 	}
 
-	return NT_STATUS_NOT_SUPPORTED;
+	status = pvfs_check_lock(pvfs, f, req->smbpid, 
+				 wr->writex.in.offset,
+				 wr->writex.in.count,
+				 WRITE_LOCK);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+	
+	ret = pwrite(f->fd, 
+		     wr->writex.in.data, 
+		     wr->writex.in.count,
+		     wr->writex.in.offset);
+	if (ret == -1) {
+		return map_nt_error_from_unix(errno);
+	}
+	
+	wr->writex.out.nwritten = ret;
+	wr->writex.out.remaining = 0; /* should fill this in? */
+	
+	return NT_STATUS_OK;
 }