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 3 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, see <http://www.gnu.org/licenses/>.
23 #include "lib/events/events.h"
24 #include "lib/util/dlinklist.h"
25 #include "vfs_posix.h"
26 #include "smbd/service_stream.h"
27 #include "lib/messaging/irpc.h"
29 /* the context for a single wait instance */
31 struct pvfs_wait *next, *prev;
32 struct pvfs_state *pvfs;
33 void (*handler)(void *, enum pvfs_wait_notice);
36 struct messaging_context *msg_ctx;
37 struct event_context *ev;
38 struct ntvfs_request *req;
39 enum pvfs_wait_notice reason;
43 called from the ntvfs layer when we have requested setup of an async
44 call. this ensures that async calls runs with the right state of
45 previous ntvfs handlers in the chain (such as security context)
47 NTSTATUS pvfs_async_setup(struct ntvfs_module_context *ntvfs,
48 struct ntvfs_request *req, void *private)
50 struct pvfs_wait *pwait = private;
51 pwait->handler(pwait->private, pwait->reason);
56 receive a completion message for a wait
58 static void pvfs_wait_dispatch(struct messaging_context *msg, void *private, uint32_t msg_type,
59 struct server_id src, DATA_BLOB *data)
61 struct pvfs_wait *pwait = private;
62 struct ntvfs_request *req;
65 /* we need to check that this one is for us. See
66 messaging_send_ptr() for the other side of this.
68 if (data->length == sizeof(void *)) {
70 pp = (void **)data->data;
73 if (p == NULL || p != pwait->private) {
77 pwait->reason = PVFS_WAIT_EVENT;
80 /* the extra reference here is to ensure that the req
81 structure is not destroyed when the async request reply is
82 sent, which would cause problems with the other ntvfs
84 talloc_reference(msg, req);
85 ntvfs_async_setup(pwait->req, pwait);
86 talloc_unlink(msg, req);
91 receive a timeout on a message wait
93 static void pvfs_wait_timeout(struct event_context *ev,
94 struct timed_event *te, struct timeval t, void *private)
96 struct pvfs_wait *pwait = talloc_get_type(private, struct pvfs_wait);
97 struct ntvfs_request *req = pwait->req;
99 pwait->reason = PVFS_WAIT_TIMEOUT;
101 talloc_increase_ref_count(req);
102 ntvfs_async_setup(pwait->req, pwait);
108 destroy a pending wait
110 static int pvfs_wait_destructor(struct pvfs_wait *pwait)
112 if (pwait->msg_type != -1) {
113 messaging_deregister(pwait->msg_ctx, pwait->msg_type, pwait);
115 DLIST_REMOVE(pwait->pvfs->wait_list, pwait);
120 setup a request to wait on a message of type msg_type, with a
121 timeout (given as an expiry time)
123 the return value is a handle. To stop waiting talloc_free this
126 if msg_type == -1 then no message is registered, and it is assumed
127 that the caller handles any messaging setup needed
129 void *pvfs_wait_message(struct pvfs_state *pvfs,
130 struct ntvfs_request *req,
132 struct timeval end_time,
133 void (*fn)(void *, enum pvfs_wait_notice),
136 struct pvfs_wait *pwait;
138 pwait = talloc(pvfs, struct pvfs_wait);
143 pwait->private = private;
145 pwait->msg_ctx = pvfs->ntvfs->ctx->msg_ctx;
146 pwait->ev = pvfs->ntvfs->ctx->event_ctx;
147 pwait->msg_type = msg_type;
148 pwait->req = talloc_reference(pwait, req);
151 if (!timeval_is_zero(&end_time)) {
153 event_add_timed(pwait->ev, pwait, end_time, pvfs_wait_timeout, pwait);
156 /* register with the messaging subsystem for this message
158 if (msg_type != -1) {
159 messaging_register(pwait->msg_ctx,
165 /* tell the main smb server layer that we will be replying
167 req->async_states->state |= NTVFS_ASYNC_STATE_ASYNC;
169 DLIST_ADD(pvfs->wait_list, pwait);
171 /* make sure we cleanup the timer and message handler */
172 talloc_set_destructor(pwait, pvfs_wait_destructor);
179 cancel an outstanding async request
181 NTSTATUS pvfs_cancel(struct ntvfs_module_context *ntvfs, struct ntvfs_request *req)
183 struct pvfs_state *pvfs = ntvfs->private_data;
184 struct pvfs_wait *pwait;
186 for (pwait=pvfs->wait_list;pwait;pwait=pwait->next) {
187 if (pwait->req == req) {
188 /* trigger a cancel on the request */
189 pwait->reason = PVFS_WAIT_CANCEL;
190 ntvfs_async_setup(pwait->req, pwait);
195 return NT_STATUS_DOS(ERRDOS, ERRcancelviolation);