4 * Copyright (C) International Business Machines Corp., 2002,2004
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/list.h>
24 #include <linux/wait.h>
25 #include <linux/net.h>
26 #include <asm/uaccess.h>
27 #include <asm/processor.h>
28 #include <linux/mempool.h>
31 #include "cifsproto.h"
32 #include "cifs_debug.h"
34 extern mempool_t *cifs_mid_poolp;
35 extern kmem_cache_t *cifs_oplock_cachep;
38 AllocMidQEntry(struct smb_hdr *smb_buffer, struct cifsSesInfo *ses)
40 struct mid_q_entry *temp;
43 cERROR(1, ("Null session passed in to AllocMidQEntry "));
46 if (ses->server == NULL) {
47 cERROR(1, ("Null TCP session in AllocMidQEntry"));
51 temp = (struct mid_q_entry *) mempool_alloc(cifs_mid_poolp,SLAB_KERNEL | SLAB_NOFS);
55 memset(temp, 0, sizeof (struct mid_q_entry));
56 temp->mid = smb_buffer->Mid; /* always LE */
57 temp->pid = current->pid;
58 temp->command = smb_buffer->Command;
59 cFYI(1, ("For smb_command %d", temp->command));
60 do_gettimeofday(&temp->when_sent);
65 spin_lock(&GlobalMid_Lock);
66 list_add_tail(&temp->qhead, &ses->server->pending_mid_q);
67 atomic_inc(&midCount);
68 temp->midState = MID_REQUEST_ALLOCATED;
69 spin_unlock(&GlobalMid_Lock);
74 DeleteMidQEntry(struct mid_q_entry *midEntry)
76 spin_lock(&GlobalMid_Lock);
77 midEntry->midState = MID_FREE;
78 list_del(&midEntry->qhead);
79 atomic_dec(&midCount);
80 spin_unlock(&GlobalMid_Lock);
81 cifs_buf_release(midEntry->resp_buf);
82 mempool_free(midEntry, cifs_mid_poolp);
85 struct oplock_q_entry *
86 AllocOplockQEntry(struct inode * pinode, __u16 fid, struct cifsTconInfo * tcon)
88 struct oplock_q_entry *temp;
89 if ((pinode== NULL) || (tcon == NULL)) {
90 cERROR(1, ("Null parms passed to AllocOplockQEntry"));
93 temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep,
98 temp->pinode = pinode;
101 spin_lock(&GlobalMid_Lock);
102 list_add_tail(&temp->qhead, &GlobalOplock_Q);
103 spin_unlock(&GlobalMid_Lock);
109 void DeleteOplockQEntry(struct oplock_q_entry * oplockEntry)
111 spin_lock(&GlobalMid_Lock);
112 /* should we check if list empty first? */
113 list_del(&oplockEntry->qhead);
114 spin_unlock(&GlobalMid_Lock);
115 kmem_cache_free(cifs_oplock_cachep, oplockEntry);
119 smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer,
120 unsigned int smb_buf_length, struct sockaddr *sin)
124 struct msghdr smb_msg;
126 unsigned len = smb_buf_length + 4;
129 return -ENOTSOCK; /* BB eventually add reconnect code here */
130 iov.iov_base = smb_buffer;
133 smb_msg.msg_name = sin;
134 smb_msg.msg_namelen = sizeof (struct sockaddr);
135 smb_msg.msg_control = NULL;
136 smb_msg.msg_controllen = 0;
137 smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/
139 /* smb header is converted in header_assemble. bcc and rest of SMB word
140 area, and byte area if necessary, is converted to littleendian in
141 cifssmb.c and RFC1001 len is converted to bigendian in smb_send
142 Flags2 is converted in SendReceive */
144 smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
145 cFYI(1, ("Sending smb of length %d ", smb_buf_length));
146 dump_smb(smb_buffer, len);
149 rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len);
150 if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
154 ("sends on sock %p stuck for 30 seconds",
159 set_current_state(TASK_INTERRUPTIBLE);
160 schedule_timeout(HZ/2);
171 cERROR(1,("Error %d sending data on socket to server.", rc));
180 SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
181 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
182 int *pbytes_returned, const int long_op)
185 unsigned int receive_len;
186 unsigned long timeout;
187 struct mid_q_entry *midQ;
190 cERROR(1,("Null smb session"));
193 if(ses->server == NULL) {
194 cERROR(1,("Null tcp session"));
198 /* Ensure that we do not send more than 50 overlapping requests
199 to the same server. We may make this configurable later or
202 /* oplock breaks must not be held up */
203 atomic_inc(&ses->server->inFlight);
205 spin_lock(&GlobalMid_Lock);
207 if(atomic_read(&ses->server->inFlight) >= CIFS_MAX_REQ){
208 spin_unlock(&GlobalMid_Lock);
209 wait_event(ses->server->request_q,
210 atomic_read(&ses->server->inFlight)
212 spin_lock(&GlobalMid_Lock);
214 if(ses->server->tcpStatus == CifsExiting) {
215 spin_unlock(&GlobalMid_Lock);
219 /* can not count locking commands against total since
220 they are allowed to block on server */
223 /* update # of requests on the wire to server */
224 atomic_inc(&ses->server->inFlight);
226 spin_unlock(&GlobalMid_Lock);
231 /* make sure that we sign in the same order that we send on this socket
232 and avoid races inside tcp sendmsg code that could cause corruption
235 down(&ses->server->tcpSem);
237 if (ses->server->tcpStatus == CifsExiting) {
240 } else if (ses->server->tcpStatus == CifsNeedReconnect) {
241 cFYI(1,("tcp session dead - return to caller to retry"));
244 } else if (ses->status != CifsGood) {
245 /* check if SMB session is bad because we are setting it up */
246 if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
247 (in_buf->Command != SMB_COM_NEGOTIATE)) {
250 } /* else ok - we are setting up session */
252 midQ = AllocMidQEntry(in_buf, ses);
254 up(&ses->server->tcpSem);
255 /* If not lock req, update # of requests on wire to server */
257 atomic_dec(&ses->server->inFlight);
258 wake_up(&ses->server->request_q);
263 if (in_buf->smb_buf_length > CIFS_MAX_MSGSIZE + MAX_CIFS_HDR_SIZE - 4) {
264 up(&ses->server->tcpSem);
266 ("Illegal length, greater than maximum frame, %d ",
267 in_buf->smb_buf_length));
268 DeleteMidQEntry(midQ);
269 /* If not lock req, update # of requests on wire to server */
271 atomic_dec(&ses->server->inFlight);
272 wake_up(&ses->server->request_q);
277 rc = cifs_sign_smb(in_buf, ses, &midQ->sequence_number);
279 midQ->midState = MID_REQUEST_SUBMITTED;
280 rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
281 (struct sockaddr *) &(ses->server->addr.sockAddr));
283 DeleteMidQEntry(midQ);
284 up(&ses->server->tcpSem);
285 /* If not lock req, update # of requests on wire to server */
287 atomic_dec(&ses->server->inFlight);
288 wake_up(&ses->server->request_q);
292 up(&ses->server->tcpSem);
294 goto cifs_no_response_exit;
295 else if (long_op == 2) /* writes past end of file can take looooong time */
297 else if (long_op == 1)
298 timeout = 45 * HZ; /* should be greater than
299 servers oplock break timeout (about 43 seconds) */
300 else if (long_op > 2) {
301 timeout = MAX_SCHEDULE_TIMEOUT;
304 /* wait for 15 seconds or until woken up due to response arriving or
305 due to last connection to this server being unmounted */
306 if (signal_pending(current)) {
307 /* if signal pending do not hold up user for full smb timeout
308 but we still give response a change to complete */
313 /* No user interrupts in wait - wreaks havoc with performance */
314 if(timeout != MAX_SCHEDULE_TIMEOUT) {
316 wait_event(ses->server->response_q,
317 (midQ->midState & MID_RESPONSE_RECEIVED) ||
318 time_after(jiffies, timeout) ||
319 ((ses->server->tcpStatus != CifsGood) &&
320 (ses->server->tcpStatus != CifsNew)));
322 wait_event(ses->server->response_q,
323 (midQ->midState & MID_RESPONSE_RECEIVED) ||
324 ((ses->server->tcpStatus != CifsGood) &&
325 (ses->server->tcpStatus != CifsNew)));
328 spin_lock(&GlobalMid_Lock);
329 if (midQ->resp_buf) {
330 spin_unlock(&GlobalMid_Lock);
331 receive_len = be32_to_cpu(*(__be32 *)midQ->resp_buf);
333 cERROR(1,("No response buffer"));
334 if(midQ->midState == MID_REQUEST_SUBMITTED) {
335 if(ses->server->tcpStatus == CifsExiting)
338 ses->server->tcpStatus = CifsNeedReconnect;
339 midQ->midState = MID_RETRY_NEEDED;
343 if (rc != -EHOSTDOWN) {
344 if(midQ->midState == MID_RETRY_NEEDED) {
346 cFYI(1,("marking request for retry"));
351 spin_unlock(&GlobalMid_Lock);
352 DeleteMidQEntry(midQ);
353 /* If not lock req, update # of requests on wire to server */
355 atomic_dec(&ses->server->inFlight);
356 wake_up(&ses->server->request_q);
361 if (receive_len > CIFS_MAX_MSGSIZE + MAX_CIFS_HDR_SIZE) {
363 ("Frame too large received. Length: %d Xid: %d",
366 } else { /* rcvd frame is ok */
368 if (midQ->resp_buf && out_buf
369 && (midQ->midState == MID_RESPONSE_RECEIVED)) {
370 out_buf->smb_buf_length = receive_len;
371 memcpy((char *)out_buf + 4,
372 (char *)midQ->resp_buf + 4,
375 dump_smb(out_buf, 92);
376 /* convert the length into a more usable form */
377 if((receive_len > 24) &&
378 (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))) {
379 rc = cifs_verify_signature(out_buf, ses->mac_signing_key,midQ->sequence_number); /* BB fix BB */
381 cFYI(1,("Unexpected signature received from server"));
384 *pbytes_returned = out_buf->smb_buf_length;
386 /* BB special case reconnect tid and reconnect uid here? */
387 rc = map_smb_to_linux_error(out_buf);
389 /* convert ByteCount if necessary */
391 sizeof (struct smb_hdr) -
392 4 /* do not count RFC1001 header */ +
393 (2 * out_buf->WordCount) + 2 /* bcc */ )
394 BCC(out_buf) = le16_to_cpu(BCC(out_buf));
397 cFYI(1,("Bad MID state? "));
400 cifs_no_response_exit:
401 DeleteMidQEntry(midQ);
404 atomic_dec(&ses->server->inFlight);
405 wake_up(&ses->server->request_q);
411 up(&ses->server->tcpSem);
412 /* If not lock req, update # of requests on wire to server */
414 atomic_dec(&ses->server->inFlight);
415 wake_up(&ses->server->request_q);