2 Unix SMB/CIFS implementation.
4 POSIX NTVFS backend - async request wait routines
6 Copyright (C) Andrew Tridgell 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.
24 #include "lib/events/events.h"
25 #include "dlinklist.h"
26 #include "vfs_posix.h"
27 #include "smbd/service_stream.h"
28 #include "lib/messaging/irpc.h"
30 /* the context for a single wait instance */
32 struct pvfs_wait *next, *prev;
33 struct pvfs_state *pvfs;
34 void (*handler)(void *, enum pvfs_wait_notice);
36 struct timed_event *te;
38 struct messaging_context *msg_ctx;
39 struct event_context *ev;
40 struct smbsrv_request *req;
41 enum pvfs_wait_notice reason;
45 called from the ntvfs layer when we have requested setup of an async
46 call. this ensures that async calls runs with the right state of
47 previous ntvfs handlers in the chain (such as security context)
49 NTSTATUS pvfs_async_setup(struct ntvfs_module_context *ntvfs,
50 struct smbsrv_request *req, void *private)
52 struct pvfs_wait *pwait = private;
53 pwait->handler(pwait->private, pwait->reason);
58 receive a completion message for a wait
60 static void pvfs_wait_dispatch(struct messaging_context *msg, void *private, uint32_t msg_type,
61 uint32_t src, DATA_BLOB *data)
63 struct pvfs_wait *pwait = private;
64 struct smbsrv_request *req;
66 /* we need to check that this one is for us. See
67 messaging_send_ptr() for the other side of this.
69 if (data->length != sizeof(void *) ||
70 *(void **)data->data != pwait->private) {
73 pwait->reason = PVFS_WAIT_EVENT;
76 /* the extra reference here is to ensure that the req
77 structure is not destroyed when the async request reply is
78 sent, which would cause problems with the other ntvfs
80 talloc_increase_ref_count(req);
81 ntvfs_async_setup(pwait->req, pwait);
87 receive a timeout on a message wait
89 static void pvfs_wait_timeout(struct event_context *ev,
90 struct timed_event *te, struct timeval t, void *private)
92 struct pvfs_wait *pwait = talloc_get_type(private, struct pvfs_wait);
93 struct smbsrv_request *req = pwait->req;
95 pwait->reason = PVFS_WAIT_TIMEOUT;
97 talloc_increase_ref_count(req);
98 ntvfs_async_setup(pwait->req, pwait);
104 destroy a pending wait
106 static int pvfs_wait_destructor(void *ptr)
108 struct pvfs_wait *pwait = ptr;
109 messaging_deregister(pwait->msg_ctx, pwait->msg_type, pwait);
110 DLIST_REMOVE(pwait->pvfs->wait_list, pwait);
115 setup a request to wait on a message of type msg_type, with a
116 timeout (given as an expiry time)
118 the return value is a handle. To stop waiting talloc_free this
121 void *pvfs_wait_message(struct pvfs_state *pvfs,
122 struct smbsrv_request *req,
124 struct timeval end_time,
125 void (*fn)(void *, enum pvfs_wait_notice),
128 struct pvfs_wait *pwait;
130 pwait = talloc(pvfs, struct pvfs_wait);
135 pwait->private = private;
137 pwait->msg_ctx = pvfs->tcon->smb_conn->connection->msg_ctx;
138 pwait->ev = req->tcon->smb_conn->connection->event.ctx;
139 pwait->msg_type = msg_type;
140 pwait->req = talloc_reference(pwait, req);
144 pwait->te = event_add_timed(pwait->ev, pwait, end_time,
145 pvfs_wait_timeout, pwait);
147 /* register with the messaging subsystem for this message
149 messaging_register(pwait->msg_ctx,
154 /* tell the main smb server layer that we will be replying
156 req->async_states->state |= NTVFS_ASYNC_STATE_ASYNC;
158 DLIST_ADD(pvfs->wait_list, pwait);
160 /* make sure we cleanup the timer and message handler */
161 talloc_set_destructor(pwait, pvfs_wait_destructor);
168 cancel an outstanding async request
170 NTSTATUS pvfs_cancel(struct ntvfs_module_context *ntvfs, struct smbsrv_request *req)
172 struct pvfs_state *pvfs = ntvfs->private_data;
173 struct pvfs_wait *pwait;
174 for (pwait=pvfs->wait_list;pwait;pwait=pwait->next) {
175 if (SVAL(req->in.hdr, HDR_MID) == SVAL(pwait->req->in.hdr, HDR_MID) &&
176 req->smbpid == pwait->req->smbpid) {
177 /* trigger a cancel on the request */
178 pwait->reason = PVFS_WAIT_CANCEL;
179 ntvfs_async_setup(pwait->req, pwait);
184 return NT_STATUS_DOS(ERRDOS, ERRcancelviolation);