2 Unix SMB/CIFS implementation.
5 Copyright (C) Andrew Tridgell 2003
6 Copyright (C) Stefan (metze) Metzmacher 2004
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 this implements the core code for all NTVFS modules. Backends register themselves here.
29 /* the list of currently registered NTVFS backends, note that there
30 * can be more than one backend with the same name, as long as they
31 * have different typesx */
33 const struct ntvfs_ops *ops;
35 static int num_backends;
38 register a NTVFS backend.
40 The 'name' can be later used by other backends to find the operations
41 structure for this backend.
43 The 'type' is used to specify whether this is for a disk, printer or IPC$ share
45 static NTSTATUS ntvfs_register(void *_ops)
47 const struct ntvfs_ops *ops = _ops;
48 struct ntvfs_ops *new_ops;
50 if (ntvfs_backend_byname(ops->name, ops->type) != NULL) {
51 /* its already registered! */
52 DEBUG(0,("NTVFS backend '%s' for type %d already registered\n",
53 ops->name, (int)ops->type));
54 return NT_STATUS_OBJECT_NAME_COLLISION;
57 backends = Realloc(backends, sizeof(backends[0]) * (num_backends+1));
59 smb_panic("out of memory in ntvfs_register");
62 new_ops = smb_xmemdup(ops, sizeof(*ops));
63 new_ops->name = smb_xstrdup(ops->name);
65 backends[num_backends].ops = new_ops;
69 DEBUG(3,("NTVFS backend '%s' for type %d registered\n",
70 ops->name,ops->type));
77 return the operations structure for a named backend of the specified type
79 const struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type)
83 for (i=0;i<num_backends;i++) {
84 if (backends[i].ops->type == type &&
85 strcmp(backends[i].ops->name, name) == 0) {
86 return backends[i].ops;
95 return the NTVFS interface version, and the size of some critical types
96 This can be used by backends to either detect compilation errors, or provide
97 multiple implementations for different smbd compilation options in one module
99 const struct ntvfs_critical_sizes *ntvfs_interface_version(void)
101 static const struct ntvfs_critical_sizes critical_sizes = {
102 NTVFS_INTERFACE_VERSION,
103 sizeof(struct ntvfs_ops),
105 sizeof(struct smbsrv_tcon),
106 sizeof(struct request_context),
109 return &critical_sizes;
114 initialise the NTVFS subsystem
116 BOOL ntvfs_init(void)
120 status = register_subsystem("ntvfs", ntvfs_register);
121 if (!NT_STATUS_IS_OK(status)) {
125 /* FIXME: Perhaps panic if a basic backend, such as IPC, fails to initialise? */
128 DEBUG(3,("NTVFS subsystem version %d initialised\n", NTVFS_INTERFACE_VERSION));
134 initialise a connection structure to point at a NTVFS backend
136 NTSTATUS ntvfs_init_connection(struct request_context *req)
138 const char *handler = lp_ntvfs_handler(req->tcon->service);
140 req->tcon->ntvfs_ops = ntvfs_backend_byname(handler, req->tcon->type);
142 if (!req->tcon->ntvfs_ops) {
143 DEBUG(1,("ntvfs_init_connection: failed to find backend=%s, type=%d\n", handler, req->tcon->type));
144 return NT_STATUS_UNSUCCESSFUL;