1 files changed, 117 insertions, 0 deletions
diff --git a/source4/ntvfs/ntvfs_dfs.c b/source4/ntvfs/ntvfs_dfs.c
new file mode 100644
index 0000000000..7acd1f7cbb
--- /dev/null
+++ b/source4/ntvfs/ntvfs_dfs.c
@@ -0,0 +1,117 @@
+/* 
+   Unix SMB/CIFS implementation.
+   NTVFS base code
+   Copyright (C) Andrew Tridgell 2003
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+/*
+  this implements the core code for all NTVFS modules. Backends register themselves here.
+*/
+
+#include "includes.h"
+
+
+/* the list of currently registered NTVFS backends, note that there
+ * can be more than one backend with the same name, as long as they
+ * have different typesx */
+static struct {
+	const char *name;
+	enum ntvfs_type type;
+	struct ntvfs_ops *ops;
+} *backends = NULL;
+static int num_backends;
+
+/*
+  register a NTVFS backend. 
+
+  The 'name' can be later used by other backends to find the operations
+  structure for this backend.  
+
+  The 'type' is used to specify whether this is for a disk, printer or IPC$ share
+*/
+BOOL ntvfs_register(const char *name, enum ntvfs_type type, struct ntvfs_ops *ops)
+{
+	if (ntvfs_backend_byname(name, type) != NULL) {
+		/* its already registered! */
+		DEBUG(2,("NTVFS backend '%s' for type %d already registered\n", 
+			 name, (int)type));
+		return False;
+	}
+
+	backends = Realloc(backends, sizeof(backends[0]) * (num_backends+1));
+	if (!backends) {
+		smb_panic("out of memory in ntvfs_register");
+	}
+
+	backends[num_backends].name = smb_xstrdup(name);
+	backends[num_backends].type = type;
+	backends[num_backends].ops = smb_xmemdup(ops, sizeof(*ops));
+
+	num_backends++;
+
+	return True;
+}
+
+
+/*
+  return the operations structure for a named backend of the specified type
+*/
+struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type)
+{
+	int i;
+
+	for (i=0;i<num_backends;i++) {
+		if (backends[i].type == type && 
+		    strcmp(backends[i].name, name) == 0) {
+			return backends[i].ops;
+		}
+	}
+
+	return NULL;
+}
+
+
+/*
+  return the NTVFS interface version, and the size of some critical types
+  This can be used by backends to either detect compilation errors, or provide
+  multiple implementations for different smbd compilation options in one module
+*/
+int ntvfs_interface_version(struct ntvfs_critical_sizes *sizes)
+{
+	sizes->sizeof_ntvfs_ops = sizeof(struct ntvfs_ops);
+	sizes->sizeof_SMB_OFF_T = sizeof(SMB_OFF_T);
+	sizes->sizeof_tcon_context = sizeof(struct tcon_context);
+
+	return NTVFS_INTERFACE_VERSION;
+}
+
+
+/*
+  initialise the NTVFS subsystem
+*/
+BOOL ntvfs_init(void)
+{
+	/* initialise our 3 basic backends. These are assumed to be
+	 * present and are always built in */
+	if (!posix_vfs_init() ||
+	    !ipc_vfs_init() ||
+	    !print_vfs_init()) {
+		return False;
+	}
+
+	DEBUG(3,("NTVFS version %d initialised\n", NTVFS_INTERFACE_VERSION));
+	return True;
+}