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.
25 #include "dlinklist.h"
26 #include "vfs_posix.h"
28 /* the context for a single wait instance */
30 struct pvfs_wait *next, *prev;
31 struct pvfs_state *pvfs;
32 void (*handler)(void *, enum pvfs_wait_notice);
34 struct timed_event *te;
36 struct messaging_context *msg_ctx;
37 struct event_context *ev;
38 struct smbsrv_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 smbsrv_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 servid_t src, DATA_BLOB *data)
61 struct pvfs_wait *pwait = private;
62 struct smbsrv_request *req;
64 /* we need to check that this one is for us. See
65 messaging_send_ptr() for the other side of this.
67 if (data->length != sizeof(void *) ||
68 *(void **)data->data != pwait->private) {
71 pwait->reason = PVFS_WAIT_EVENT;
74 /* the extra reference here is to ensure that the req
75 structure is not destroyed when the async request reply is
76 sent, which would cause problems with the other ntvfs
78 talloc_increase_ref_count(req);
79 ntvfs_async_setup(pwait->req, pwait);
85 receive a timeout on a message wait
87 static void pvfs_wait_timeout(struct event_context *ev,
88 struct timed_event *te, struct timeval t)
90 struct pvfs_wait *pwait = te->private;
91 struct smbsrv_request *req = pwait->req;
93 pwait->reason = PVFS_WAIT_TIMEOUT;
95 talloc_increase_ref_count(req);
96 ntvfs_async_setup(pwait->req, pwait);
102 destroy a pending wait
104 static int pvfs_wait_destructor(void *ptr)
106 struct pvfs_wait *pwait = ptr;
107 messaging_deregister(pwait->msg_ctx, pwait->msg_type, pwait);
108 DLIST_REMOVE(pwait->pvfs->wait_list, pwait);
113 setup a request to wait on a message of type msg_type, with a
114 timeout (given as an expiry time)
116 the return value is a handle. To stop waiting talloc_free this
119 void *pvfs_wait_message(struct pvfs_state *pvfs,
120 struct smbsrv_request *req,
122 struct timeval end_time,
123 void (*fn)(void *, enum pvfs_wait_notice),
126 struct timed_event te;
127 struct pvfs_wait *pwait;
129 pwait = talloc(pvfs, struct pvfs_wait);
134 pwait->private = private;
136 pwait->msg_ctx = pvfs->tcon->smb_conn->connection->messaging.ctx;
137 pwait->ev = req->tcon->smb_conn->connection->event.ctx;
138 pwait->msg_type = msg_type;
139 pwait->req = talloc_reference(pwait, req);
143 te.next_event = end_time;
144 te.handler = pvfs_wait_timeout;
146 pwait->te = event_add_timed(pwait->ev, &te, pwait);
148 /* register with the messaging subsystem for this message
150 messaging_register(pwait->msg_ctx,
155 /* tell the main smb server layer that we will be replying
157 req->async_states->state |= NTVFS_ASYNC_STATE_ASYNC;
159 DLIST_ADD(pvfs->wait_list, pwait);
161 /* make sure we cleanup the timer and message handler */
162 talloc_set_destructor(pwait, pvfs_wait_destructor);
169 cancel an outstanding async request
171 NTSTATUS pvfs_cancel(struct ntvfs_module_context *ntvfs, struct smbsrv_request *req)
173 struct pvfs_state *pvfs = ntvfs->private_data;
174 struct pvfs_wait *pwait;
175 for (pwait=pvfs->wait_list;pwait;pwait=pwait->next) {
176 if (SVAL(req->in.hdr, HDR_MID) == SVAL(pwait->req->in.hdr, HDR_MID) &&
177 req->smbpid == pwait->req->smbpid) {
178 /* trigger a cancel on the request */
179 pwait->reason = PVFS_WAIT_CANCEL;
180 ntvfs_async_setup(pwait->req, pwait);
185 return NT_STATUS_UNSUCCESSFUL;