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;
128 return -ENOTSOCK; /* BB eventually add reconnect code here */
129 iov.iov_base = smb_buffer;
130 iov.iov_len = smb_buf_length + 4;
132 smb_msg.msg_name = sin;
133 smb_msg.msg_namelen = sizeof (struct sockaddr);
134 smb_msg.msg_control = NULL;
135 smb_msg.msg_controllen = 0;
136 smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/
138 /* smb header is converted in header_assemble. bcc and rest of SMB word
139 area, and byte area if necessary, is converted to littleendian in
140 cifssmb.c and RFC1001 len is converted to bigendian in smb_send
141 Flags2 is converted in SendReceive */
143 smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
144 cFYI(1, ("Sending smb of length %d ", smb_buf_length));
145 dump_smb(smb_buffer, smb_buf_length + 4);
147 while(iov.iov_len > 0) {
148 rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, smb_buf_length + 4);
149 if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
153 ("sends on sock %p stuck for 30 seconds",
158 set_current_state(TASK_INTERRUPTIBLE);
159 schedule_timeout(HZ/2);
169 cERROR(1,("Error %d sending data on socket to server.", rc));
178 SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
179 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
180 int *pbytes_returned, const int long_op)
183 unsigned int receive_len;
185 struct mid_q_entry *midQ;
188 cERROR(1,("Null smb session"));
191 if(ses->server == NULL) {
192 cERROR(1,("Null tcp session"));
196 /* Ensure that we do not send more than 50 overlapping requests
197 to the same server. We may make this configurable later or
200 /* oplock breaks must not be held up */
201 atomic_inc(&ses->server->inFlight);
203 spin_lock(&GlobalMid_Lock);
205 if(atomic_read(&ses->server->inFlight) >= CIFS_MAX_REQ){
206 spin_unlock(&GlobalMid_Lock);
207 wait_event(ses->server->request_q,
208 atomic_read(&ses->server->inFlight)
210 spin_lock(&GlobalMid_Lock);
212 if(ses->server->tcpStatus == CifsExiting) {
213 spin_unlock(&GlobalMid_Lock);
217 /* can not count locking commands against total since
218 they are allowed to block on server */
221 /* update # of requests on the wire to server */
222 atomic_inc(&ses->server->inFlight);
224 spin_unlock(&GlobalMid_Lock);
229 /* make sure that we sign in the same order that we send on this socket
230 and avoid races inside tcp sendmsg code that could cause corruption
233 down(&ses->server->tcpSem);
235 if (ses->server->tcpStatus == CifsExiting) {
238 } else if (ses->server->tcpStatus == CifsNeedReconnect) {
239 cFYI(1,("tcp session dead - return to caller to retry"));
242 } else if (ses->status != CifsGood) {
243 /* check if SMB session is bad because we are setting it up */
244 if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
245 (in_buf->Command != SMB_COM_NEGOTIATE)) {
248 } /* else ok - we are setting up session */
250 midQ = AllocMidQEntry(in_buf, ses);
252 up(&ses->server->tcpSem);
253 /* If not lock req, update # of requests on wire to server */
255 atomic_dec(&ses->server->inFlight);
256 wake_up(&ses->server->request_q);
261 if (in_buf->smb_buf_length > CIFS_MAX_MSGSIZE + MAX_CIFS_HDR_SIZE - 4) {
262 up(&ses->server->tcpSem);
264 ("Illegal length, greater than maximum frame, %d ",
265 in_buf->smb_buf_length));
266 DeleteMidQEntry(midQ);
267 /* If not lock req, update # of requests on wire to server */
269 atomic_dec(&ses->server->inFlight);
270 wake_up(&ses->server->request_q);
275 if (in_buf->smb_buf_length > 12)
276 in_buf->Flags2 = cpu_to_le16(in_buf->Flags2);
278 rc = cifs_sign_smb(in_buf, ses, &midQ->sequence_number);
280 midQ->midState = MID_REQUEST_SUBMITTED;
281 rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
282 (struct sockaddr *) &(ses->server->addr.sockAddr));
284 DeleteMidQEntry(midQ);
285 up(&ses->server->tcpSem);
286 /* If not lock req, update # of requests on wire to server */
288 atomic_dec(&ses->server->inFlight);
289 wake_up(&ses->server->request_q);
293 up(&ses->server->tcpSem);
295 goto cifs_no_response_exit;
296 else if (long_op == 2) /* writes past end of file can take looooong time */
298 else if (long_op == 1)
299 timeout = 45 * HZ; /* should be greater than
300 servers oplock break timeout (about 43 seconds) */
301 else if (long_op > 2) {
302 timeout = MAX_SCHEDULE_TIMEOUT;
305 /* wait for 15 seconds or until woken up due to response arriving or
306 due to last connection to this server being unmounted */
307 if (signal_pending(current)) {
308 /* if signal pending do not hold up user for full smb timeout
309 but we still give response a change to complete */
310 if(midQ->midState & MID_REQUEST_SUBMITTED) {
311 set_current_state(TASK_UNINTERRUPTIBLE);
312 timeout = sleep_on_timeout(&ses->server->response_q,2 * HZ);
314 } else { /* using normal timeout */
315 /* timeout = wait_event_interruptible_timeout(ses->server->response_q,
316 (midQ->midState & MID_RESPONSE_RECEIVED) ||
317 ((ses->server->tcpStatus != CifsGood) &&
318 (ses->server->tcpStatus != CifsNew)),
320 /* Can not allow user interrupts- wreaks havoc with performance */
321 if(midQ->midState & MID_REQUEST_SUBMITTED) {
322 set_current_state(TASK_UNINTERRUPTIBLE);
323 timeout = sleep_on_timeout(&ses->server->response_q,timeout);
327 spin_lock(&GlobalMid_Lock);
328 if (midQ->resp_buf) {
329 spin_unlock(&GlobalMid_Lock);
330 receive_len = be32_to_cpu(midQ->resp_buf->smb_buf_length);
332 cERROR(1,("No response buffer"));
333 if(midQ->midState == MID_REQUEST_SUBMITTED) {
334 if(ses->server->tcpStatus == CifsExiting)
337 ses->server->tcpStatus = CifsNeedReconnect;
338 midQ->midState = MID_RETRY_NEEDED;
342 if (rc != -EHOSTDOWN) {
343 if(midQ->midState == MID_RETRY_NEEDED) {
345 cFYI(1,("marking request for retry"));
350 spin_unlock(&GlobalMid_Lock);
351 DeleteMidQEntry(midQ);
352 /* If not lock req, update # of requests on wire to server */
354 atomic_dec(&ses->server->inFlight);
355 wake_up(&ses->server->request_q);
360 if (receive_len > CIFS_MAX_MSGSIZE + MAX_CIFS_HDR_SIZE) {
362 ("Frame too large received. Length: %d Xid: %d",
365 } else { /* rcvd frame is ok */
367 if (midQ->resp_buf && out_buf
368 && (midQ->midState == MID_RESPONSE_RECEIVED)) {
369 memcpy(out_buf, midQ->resp_buf,
371 4 /* include 4 byte RFC1001 header */ );
373 dump_smb(out_buf, 92);
374 /* convert the length into a more usable form */
375 out_buf->smb_buf_length =
376 be32_to_cpu(out_buf->smb_buf_length);
377 if((out_buf->smb_buf_length > 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 if (out_buf->smb_buf_length > 12)
385 out_buf->Flags2 = le16_to_cpu(out_buf->Flags2);
386 if (out_buf->smb_buf_length > 28)
387 out_buf->Pid = le16_to_cpu(out_buf->Pid);
388 if (out_buf->smb_buf_length > 28)
390 le16_to_cpu(out_buf->PidHigh);
392 *pbytes_returned = out_buf->smb_buf_length;
394 /* BB special case reconnect tid and reconnect uid here? */
395 rc = map_smb_to_linux_error(out_buf);
397 /* convert ByteCount if necessary */
399 sizeof (struct smb_hdr) -
400 4 /* do not count RFC1001 header */ +
401 (2 * out_buf->WordCount) + 2 /* bcc */ )
402 BCC(out_buf) = le16_to_cpu(BCC(out_buf));
405 cFYI(1,("Bad MID state? "));
408 cifs_no_response_exit:
409 DeleteMidQEntry(midQ);
412 atomic_dec(&ses->server->inFlight);
413 wake_up(&ses->server->request_q);
419 up(&ses->server->tcpSem);
420 /* If not lock req, update # of requests on wire to server */
422 atomic_dec(&ses->server->inFlight);
423 wake_up(&ses->server->request_q);