4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 * Jeremy Allison (jra@samba.org) 2006.
8 * This library is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License as published
10 * by the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
13 * This library 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
16 * the GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/list.h>
25 #include <linux/gfp.h>
26 #include <linux/wait.h>
27 #include <linux/net.h>
28 #include <linux/delay.h>
29 #include <linux/freezer.h>
30 #include <linux/tcp.h>
31 #include <linux/bvec.h>
32 #include <linux/highmem.h>
33 #include <linux/uaccess.h>
34 #include <asm/processor.h>
35 #include <linux/mempool.h>
38 #include "cifsproto.h"
39 #include "cifs_debug.h"
40 #include "smb2proto.h"
41 #include "smbdirect.h"
43 /* Max number of iovectors we can use off the stack when sending requests. */
44 #define CIFS_MAX_IOV_SIZE 8
47 cifs_wake_up_task(struct mid_q_entry *mid)
49 wake_up_process(mid->callback_data);
53 AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
55 struct mid_q_entry *temp;
58 cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n");
62 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
63 memset(temp, 0, sizeof(struct mid_q_entry));
64 kref_init(&temp->refcount);
65 temp->mid = get_mid(smb_buffer);
66 temp->pid = current->pid;
67 temp->command = cpu_to_le16(smb_buffer->Command);
68 cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command);
69 /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
70 /* when mid allocated can be before when sent */
71 temp->when_alloc = jiffies;
72 temp->server = server;
75 * The default is for the mid to be synchronous, so the
76 * default callback just wakes up the current task.
78 temp->callback = cifs_wake_up_task;
79 temp->callback_data = current;
81 atomic_inc(&midCount);
82 temp->mid_state = MID_REQUEST_ALLOCATED;
86 static void _cifs_mid_q_entry_release(struct kref *refcount)
88 struct mid_q_entry *mid = container_of(refcount, struct mid_q_entry,
91 mempool_free(mid, cifs_mid_poolp);
94 void cifs_mid_q_entry_release(struct mid_q_entry *midEntry)
96 spin_lock(&GlobalMid_Lock);
97 kref_put(&midEntry->refcount, _cifs_mid_q_entry_release);
98 spin_unlock(&GlobalMid_Lock);
102 DeleteMidQEntry(struct mid_q_entry *midEntry)
104 #ifdef CONFIG_CIFS_STATS2
105 __le16 command = midEntry->server->vals->lock_cmd;
108 midEntry->mid_state = MID_FREE;
109 atomic_dec(&midCount);
110 if (midEntry->large_buf)
111 cifs_buf_release(midEntry->resp_buf);
113 cifs_small_buf_release(midEntry->resp_buf);
114 #ifdef CONFIG_CIFS_STATS2
116 /* commands taking longer than one second are indications that
117 something is wrong, unless it is quite a slow link or server */
118 if (time_after(now, midEntry->when_alloc + HZ) &&
119 (midEntry->command != command)) {
120 /* smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command */
121 if ((le16_to_cpu(midEntry->command) < NUMBER_OF_SMB2_COMMANDS) &&
122 (le16_to_cpu(midEntry->command) >= 0))
123 cifs_stats_inc(&midEntry->server->smb2slowcmd[le16_to_cpu(midEntry->command)]);
125 trace_smb3_slow_rsp(le16_to_cpu(midEntry->command),
126 midEntry->mid, midEntry->pid,
127 midEntry->when_sent, midEntry->when_received);
128 if (cifsFYI & CIFS_TIMER) {
129 pr_debug(" CIFS slow rsp: cmd %d mid %llu",
130 midEntry->command, midEntry->mid);
131 pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n",
132 now - midEntry->when_alloc,
133 now - midEntry->when_sent,
134 now - midEntry->when_received);
138 cifs_mid_q_entry_release(midEntry);
142 cifs_delete_mid(struct mid_q_entry *mid)
144 spin_lock(&GlobalMid_Lock);
145 list_del_init(&mid->qhead);
146 mid->mid_flags |= MID_DELETED;
147 spin_unlock(&GlobalMid_Lock);
149 DeleteMidQEntry(mid);
153 * smb_send_kvec - send an array of kvecs to the server
154 * @server: Server to send the data to
155 * @smb_msg: Message to send
156 * @sent: amount of data sent on socket is stored here
158 * Our basic "send data to server" function. Should be called with srv_mutex
159 * held. The caller is responsible for handling the results.
162 smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg,
167 struct socket *ssocket = server->ssocket;
171 smb_msg->msg_name = (struct sockaddr *) &server->dstaddr;
172 smb_msg->msg_namelen = sizeof(struct sockaddr);
173 smb_msg->msg_control = NULL;
174 smb_msg->msg_controllen = 0;
175 if (server->noblocksnd)
176 smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
178 smb_msg->msg_flags = MSG_NOSIGNAL;
180 while (msg_data_left(smb_msg)) {
182 * If blocking send, we try 3 times, since each can block
183 * for 5 seconds. For nonblocking we have to try more
184 * but wait increasing amounts of time allowing time for
185 * socket to clear. The overall time we wait in either
186 * case to send on the socket is about 15 seconds.
187 * Similarly we wait for 15 seconds for a response from
188 * the server in SendReceive[2] for the server to send
189 * a response back for most types of requests (except
190 * SMB Write past end of file which can be slow, and
191 * blocking lock operations). NFS waits slightly longer
192 * than CIFS, but this can make it take longer for
193 * nonresponsive servers to be detected and 15 seconds
194 * is more than enough time for modern networks to
195 * send a packet. In most cases if we fail to send
196 * after the retries we will kill the socket and
197 * reconnect which may clear the network problem.
199 rc = sock_sendmsg(ssocket, smb_msg);
203 (!server->noblocksnd && (retries > 2))) {
204 cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n",
208 msleep(1 << retries);
216 /* should never happen, letting socket clear before
217 retrying is our only obvious option here */
218 cifs_dbg(VFS, "tcp sent no data\n");
223 /* send was at least partially successful */
225 retries = 0; /* in case we get ENOSPC on the next send */
231 smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst)
236 unsigned long buflen = 0;
238 if (server->vals->header_preamble_size == 0 &&
239 rqst->rq_nvec >= 2 && rqst->rq_iov[0].iov_len == 4) {
240 iov = &rqst->rq_iov[1];
241 nvec = rqst->rq_nvec - 1;
244 nvec = rqst->rq_nvec;
247 /* total up iov array first */
248 for (i = 0; i < nvec; i++)
249 buflen += iov[i].iov_len;
252 * Add in the page array if there is one. The caller needs to make
253 * sure rq_offset and rq_tailsz are set correctly. If a buffer of
254 * multiple pages ends at page boundary, rq_tailsz needs to be set to
257 if (rqst->rq_npages) {
258 if (rqst->rq_npages == 1)
259 buflen += rqst->rq_tailsz;
262 * If there is more than one page, calculate the
263 * buffer length based on rq_offset and rq_tailsz
265 buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) -
267 buflen += rqst->rq_tailsz;
275 __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
276 struct smb_rqst *rqst)
281 unsigned int send_length = 0;
283 size_t total_len = 0, sent, size;
284 struct socket *ssocket = server->ssocket;
285 struct msghdr smb_msg;
287 __be32 rfc1002_marker;
289 if (cifs_rdma_enabled(server) && server->smbd_conn) {
290 rc = smbd_send(server, rqst);
296 /* cork the socket */
297 kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK,
298 (char *)&val, sizeof(val));
300 for (j = 0; j < num_rqst; j++)
301 send_length += smb_rqst_len(server, &rqst[j]);
302 rfc1002_marker = cpu_to_be32(send_length);
304 /* Generate a rfc1002 marker for SMB2+ */
305 if (server->vals->header_preamble_size == 0) {
307 .iov_base = &rfc1002_marker,
310 iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, &hiov,
312 rc = smb_send_kvec(server, &smb_msg, &sent);
320 cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length);
322 for (j = 0; j < num_rqst; j++) {
323 iov = rqst[j].rq_iov;
324 n_vec = rqst[j].rq_nvec;
327 for (i = 0; i < n_vec; i++) {
328 dump_smb(iov[i].iov_base, iov[i].iov_len);
329 size += iov[i].iov_len;
332 iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC,
335 rc = smb_send_kvec(server, &smb_msg, &sent);
341 /* now walk the page array and send each page in it */
342 for (i = 0; i < rqst[j].rq_npages; i++) {
345 bvec.bv_page = rqst[j].rq_pages[i];
346 rqst_page_get_length(&rqst[j], i, &bvec.bv_len,
349 iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC,
350 &bvec, 1, bvec.bv_len);
351 rc = smb_send_kvec(server, &smb_msg, &sent);
362 kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK,
363 (char *)&val, sizeof(val));
365 if ((total_len > 0) && (total_len != send_length)) {
366 cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n",
367 send_length, total_len);
369 * If we have only sent part of an SMB then the next SMB could
370 * be taken as the remainder of this one. We need to kill the
371 * socket so the server throws away the partial SMB
373 server->tcpStatus = CifsNeedReconnect;
374 trace_smb3_partial_send_reconnect(server->CurrentMid,
378 if (rc < 0 && rc != -EINTR)
379 cifs_dbg(VFS, "Error %d sending data on socket to server\n",
388 smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
389 struct smb_rqst *rqst, int flags)
392 struct smb2_transform_hdr tr_hdr;
393 struct smb_rqst cur_rqst[MAX_COMPOUND];
396 if (!(flags & CIFS_TRANSFORM_REQ))
397 return __smb_send_rqst(server, num_rqst, rqst);
399 if (num_rqst > MAX_COMPOUND - 1)
402 memset(&cur_rqst[0], 0, sizeof(cur_rqst));
403 memset(&iov, 0, sizeof(iov));
404 memset(&tr_hdr, 0, sizeof(tr_hdr));
406 iov.iov_base = &tr_hdr;
407 iov.iov_len = sizeof(tr_hdr);
408 cur_rqst[0].rq_iov = &iov;
409 cur_rqst[0].rq_nvec = 1;
411 if (!server->ops->init_transform_rq) {
412 cifs_dbg(VFS, "Encryption requested but transform callback "
417 rc = server->ops->init_transform_rq(server, num_rqst + 1,
422 rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]);
423 smb3_free_compound_rqst(num_rqst, &cur_rqst[1]);
428 smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
429 unsigned int smb_buf_length)
432 struct smb_rqst rqst = { .rq_iov = iov,
435 iov[0].iov_base = smb_buffer;
437 iov[1].iov_base = (char *)smb_buffer + 4;
438 iov[1].iov_len = smb_buf_length;
440 return __smb_send_rqst(server, 1, &rqst);
444 wait_for_free_credits(struct TCP_Server_Info *server, const int timeout,
449 spin_lock(&server->req_lock);
450 if (timeout == CIFS_ASYNC_OP) {
451 /* oplock breaks must not be held up */
454 spin_unlock(&server->req_lock);
460 spin_unlock(&server->req_lock);
461 cifs_num_waiters_inc(server);
462 rc = wait_event_killable(server->request_q,
463 has_credits(server, credits));
464 cifs_num_waiters_dec(server);
467 spin_lock(&server->req_lock);
469 if (server->tcpStatus == CifsExiting) {
470 spin_unlock(&server->req_lock);
475 * Can not count locking commands against total
476 * as they are allowed to block on server.
479 /* update # of requests on the wire to server */
480 if (timeout != CIFS_BLOCKING_OP) {
484 spin_unlock(&server->req_lock);
492 wait_for_free_request(struct TCP_Server_Info *server, const int timeout,
497 val = server->ops->get_credits_field(server, optype);
498 /* Since an echo is already inflight, no need to wait to send another */
499 if (*val <= 0 && optype == CIFS_ECHO_OP)
501 return wait_for_free_credits(server, timeout, val);
505 cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
506 unsigned int *num, unsigned int *credits)
513 static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf,
514 struct mid_q_entry **ppmidQ)
516 if (ses->server->tcpStatus == CifsExiting) {
520 if (ses->server->tcpStatus == CifsNeedReconnect) {
521 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
525 if (ses->status == CifsNew) {
526 if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
527 (in_buf->Command != SMB_COM_NEGOTIATE))
529 /* else ok - we are setting up session */
532 if (ses->status == CifsExiting) {
533 /* check if SMB session is bad because we are setting it up */
534 if (in_buf->Command != SMB_COM_LOGOFF_ANDX)
536 /* else ok - we are shutting down session */
539 *ppmidQ = AllocMidQEntry(in_buf, ses->server);
542 spin_lock(&GlobalMid_Lock);
543 list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q);
544 spin_unlock(&GlobalMid_Lock);
549 wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
553 error = wait_event_freezekillable_unsafe(server->response_q,
554 midQ->mid_state != MID_REQUEST_SUBMITTED);
562 cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
565 struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
566 struct mid_q_entry *mid;
568 if (rqst->rq_iov[0].iov_len != 4 ||
569 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
570 return ERR_PTR(-EIO);
572 /* enable signing if server requires it */
574 hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
576 mid = AllocMidQEntry(hdr, server);
578 return ERR_PTR(-ENOMEM);
580 rc = cifs_sign_rqst(rqst, server, &mid->sequence_number);
582 DeleteMidQEntry(mid);
590 * Send a SMB request and set the callback function in the mid to handle
591 * the result. Caller is responsible for dealing with timeouts.
594 cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
595 mid_receive_t *receive, mid_callback_t *callback,
596 mid_handle_t *handle, void *cbdata, const int flags)
598 int rc, timeout, optype;
599 struct mid_q_entry *mid;
600 unsigned int credits = 0;
602 timeout = flags & CIFS_TIMEOUT_MASK;
603 optype = flags & CIFS_OP_MASK;
605 if ((flags & CIFS_HAS_CREDITS) == 0) {
606 rc = wait_for_free_request(server, timeout, optype);
612 mutex_lock(&server->srv_mutex);
613 mid = server->ops->setup_async_request(server, rqst);
615 mutex_unlock(&server->srv_mutex);
616 add_credits_and_wake_if(server, credits, optype);
620 mid->receive = receive;
621 mid->callback = callback;
622 mid->callback_data = cbdata;
623 mid->handle = handle;
624 mid->mid_state = MID_REQUEST_SUBMITTED;
626 /* put it on the pending_mid_q */
627 spin_lock(&GlobalMid_Lock);
628 list_add_tail(&mid->qhead, &server->pending_mid_q);
629 spin_unlock(&GlobalMid_Lock);
632 * Need to store the time in mid before calling I/O. For call_async,
633 * I/O response may come back and free the mid entry on another thread.
635 cifs_save_when_sent(mid);
636 cifs_in_send_inc(server);
637 rc = smb_send_rqst(server, 1, rqst, flags);
638 cifs_in_send_dec(server);
641 server->sequence_number -= 2;
642 cifs_delete_mid(mid);
645 mutex_unlock(&server->srv_mutex);
650 add_credits_and_wake_if(server, credits, optype);
656 * Send an SMB Request. No response info (other than return code)
657 * needs to be parsed.
659 * flags indicate the type of request buffer and how long to wait
660 * and whether to log NT STATUS code (error) before mapping it to POSIX error
664 SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses,
665 char *in_buf, int flags)
672 iov[0].iov_base = in_buf;
673 iov[0].iov_len = get_rfc1002_length(in_buf) + 4;
674 flags |= CIFS_NO_RESP;
675 rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
676 cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc);
682 cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
686 cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n",
687 __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state);
689 spin_lock(&GlobalMid_Lock);
690 switch (mid->mid_state) {
691 case MID_RESPONSE_RECEIVED:
692 spin_unlock(&GlobalMid_Lock);
694 case MID_RETRY_NEEDED:
697 case MID_RESPONSE_MALFORMED:
704 list_del_init(&mid->qhead);
705 cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n",
706 __func__, mid->mid, mid->mid_state);
709 spin_unlock(&GlobalMid_Lock);
711 DeleteMidQEntry(mid);
716 send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst,
717 struct mid_q_entry *mid)
719 return server->ops->send_cancel ?
720 server->ops->send_cancel(server, rqst, mid) : 0;
724 cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
727 unsigned int len = get_rfc1002_length(mid->resp_buf) + 4;
729 dump_smb(mid->resp_buf, min_t(u32, 92, len));
731 /* convert the length into a more usable form */
735 struct smb_rqst rqst = { .rq_iov = iov,
738 iov[0].iov_base = mid->resp_buf;
740 iov[1].iov_base = (char *)mid->resp_buf + 4;
741 iov[1].iov_len = len - 4;
742 /* FIXME: add code to kill session */
743 rc = cifs_verify_signature(&rqst, server,
744 mid->sequence_number);
746 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
750 /* BB special case reconnect tid and uid here? */
751 return map_smb_to_linux_error(mid->resp_buf, log_error);
755 cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
758 struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
759 struct mid_q_entry *mid;
761 if (rqst->rq_iov[0].iov_len != 4 ||
762 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
763 return ERR_PTR(-EIO);
765 rc = allocate_mid(ses, hdr, &mid);
768 rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number);
770 cifs_delete_mid(mid);
777 cifs_noop_callback(struct mid_q_entry *mid)
782 compound_send_recv(const unsigned int xid, struct cifs_ses *ses,
783 const int flags, const int num_rqst, struct smb_rqst *rqst,
784 int *resp_buf_type, struct kvec *resp_iov)
788 struct mid_q_entry *midQ[MAX_COMPOUND];
789 unsigned int credits = 1;
792 timeout = flags & CIFS_TIMEOUT_MASK;
793 optype = flags & CIFS_OP_MASK;
795 for (i = 0; i < num_rqst; i++)
796 resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */
798 if ((ses == NULL) || (ses->server == NULL)) {
799 cifs_dbg(VFS, "Null session\n");
803 if (ses->server->tcpStatus == CifsExiting)
807 * Ensure that we do not send more than 50 overlapping requests
808 * to the same server. We may make this configurable later or
811 rc = wait_for_free_request(ses->server, timeout, optype);
816 * Make sure that we sign in the same order that we send on this socket
817 * and avoid races inside tcp sendmsg code that could cause corruption
821 mutex_lock(&ses->server->srv_mutex);
823 for (i = 0; i < num_rqst; i++) {
824 midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]);
825 if (IS_ERR(midQ[i])) {
826 for (j = 0; j < i; j++)
827 cifs_delete_mid(midQ[j]);
828 mutex_unlock(&ses->server->srv_mutex);
829 /* Update # of requests on wire to server */
830 add_credits(ses->server, 1, optype);
831 return PTR_ERR(midQ[i]);
834 midQ[i]->mid_state = MID_REQUEST_SUBMITTED;
836 * We don't invoke the callback compounds unless it is the last
839 if (i < num_rqst - 1)
840 midQ[i]->callback = cifs_noop_callback;
842 cifs_in_send_inc(ses->server);
843 rc = smb_send_rqst(ses->server, num_rqst, rqst, flags);
844 cifs_in_send_dec(ses->server);
846 for (i = 0; i < num_rqst; i++)
847 cifs_save_when_sent(midQ[i]);
850 ses->server->sequence_number -= 2;
852 mutex_unlock(&ses->server->srv_mutex);
854 for (i = 0; i < num_rqst; i++) {
858 if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP))
859 smb311_update_preauth_hash(ses, rqst[i].rq_iov,
862 if (timeout == CIFS_ASYNC_OP)
865 rc = wait_for_response(ses->server, midQ[i]);
867 cifs_dbg(FYI, "Cancelling wait for mid %llu\n",
869 send_cancel(ses->server, &rqst[i], midQ[i]);
870 spin_lock(&GlobalMid_Lock);
871 if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) {
872 midQ[i]->mid_flags |= MID_WAIT_CANCELLED;
873 midQ[i]->callback = DeleteMidQEntry;
874 spin_unlock(&GlobalMid_Lock);
875 add_credits(ses->server, 1, optype);
878 spin_unlock(&GlobalMid_Lock);
881 rc = cifs_sync_mid_result(midQ[i], ses->server);
883 add_credits(ses->server, 1, optype);
887 if (!midQ[i]->resp_buf ||
888 midQ[i]->mid_state != MID_RESPONSE_RECEIVED) {
890 cifs_dbg(FYI, "Bad MID state?\n");
894 buf = (char *)midQ[i]->resp_buf;
895 resp_iov[i].iov_base = buf;
896 resp_iov[i].iov_len = midQ[i]->resp_buf_size +
897 ses->server->vals->header_preamble_size;
899 if (midQ[i]->large_buf)
900 resp_buf_type[i] = CIFS_LARGE_BUFFER;
902 resp_buf_type[i] = CIFS_SMALL_BUFFER;
904 if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) {
906 .iov_base = resp_iov[i].iov_base,
907 .iov_len = resp_iov[i].iov_len
909 smb311_update_preauth_hash(ses, &iov, 1);
912 credits = ses->server->ops->get_credits(midQ[i]);
914 rc = ses->server->ops->check_receive(midQ[i], ses->server,
915 flags & CIFS_LOG_ERROR);
917 /* mark it so buf will not be freed by cifs_delete_mid */
918 if ((flags & CIFS_NO_RESP) == 0)
919 midQ[i]->resp_buf = NULL;
923 * This will dequeue all mids. After this it is important that the
924 * demultiplex_thread will not process any of these mids any futher.
925 * This is prevented above by using a noop callback that will not
926 * wake this thread except for the very last PDU.
928 for (i = 0; i < num_rqst; i++)
929 cifs_delete_mid(midQ[i]);
930 add_credits(ses->server, credits, optype);
936 cifs_send_recv(const unsigned int xid, struct cifs_ses *ses,
937 struct smb_rqst *rqst, int *resp_buf_type, const int flags,
938 struct kvec *resp_iov)
940 return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type,
945 SendReceive2(const unsigned int xid, struct cifs_ses *ses,
946 struct kvec *iov, int n_vec, int *resp_buf_type /* ret */,
947 const int flags, struct kvec *resp_iov)
949 struct smb_rqst rqst;
950 struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov;
953 if (n_vec + 1 > CIFS_MAX_IOV_SIZE) {
954 new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec),
957 /* otherwise cifs_send_recv below sets resp_buf_type */
958 *resp_buf_type = CIFS_NO_BUFFER;
964 /* 1st iov is a RFC1001 length followed by the rest of the packet */
965 memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec));
967 new_iov[0].iov_base = new_iov[1].iov_base;
968 new_iov[0].iov_len = 4;
969 new_iov[1].iov_base += 4;
970 new_iov[1].iov_len -= 4;
972 memset(&rqst, 0, sizeof(struct smb_rqst));
973 rqst.rq_iov = new_iov;
974 rqst.rq_nvec = n_vec + 1;
976 rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov);
977 if (n_vec + 1 > CIFS_MAX_IOV_SIZE)
983 SendReceive(const unsigned int xid, struct cifs_ses *ses,
984 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
985 int *pbytes_returned, const int timeout)
988 struct mid_q_entry *midQ;
989 unsigned int len = be32_to_cpu(in_buf->smb_buf_length);
990 struct kvec iov = { .iov_base = in_buf, .iov_len = len };
991 struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 };
994 cifs_dbg(VFS, "Null smb session\n");
997 if (ses->server == NULL) {
998 cifs_dbg(VFS, "Null tcp session\n");
1002 if (ses->server->tcpStatus == CifsExiting)
1005 /* Ensure that we do not send more than 50 overlapping requests
1006 to the same server. We may make this configurable later or
1009 if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
1010 cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n",
1015 rc = wait_for_free_request(ses->server, timeout, 0);
1019 /* make sure that we sign in the same order that we send on this socket
1020 and avoid races inside tcp sendmsg code that could cause corruption
1023 mutex_lock(&ses->server->srv_mutex);
1025 rc = allocate_mid(ses, in_buf, &midQ);
1027 mutex_unlock(&ses->server->srv_mutex);
1028 /* Update # of requests on wire to server */
1029 add_credits(ses->server, 1, 0);
1033 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
1035 mutex_unlock(&ses->server->srv_mutex);
1039 midQ->mid_state = MID_REQUEST_SUBMITTED;
1041 cifs_in_send_inc(ses->server);
1042 rc = smb_send(ses->server, in_buf, len);
1043 cifs_in_send_dec(ses->server);
1044 cifs_save_when_sent(midQ);
1047 ses->server->sequence_number -= 2;
1049 mutex_unlock(&ses->server->srv_mutex);
1054 if (timeout == CIFS_ASYNC_OP)
1057 rc = wait_for_response(ses->server, midQ);
1059 send_cancel(ses->server, &rqst, midQ);
1060 spin_lock(&GlobalMid_Lock);
1061 if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
1062 /* no longer considered to be "in-flight" */
1063 midQ->callback = DeleteMidQEntry;
1064 spin_unlock(&GlobalMid_Lock);
1065 add_credits(ses->server, 1, 0);
1068 spin_unlock(&GlobalMid_Lock);
1071 rc = cifs_sync_mid_result(midQ, ses->server);
1073 add_credits(ses->server, 1, 0);
1077 if (!midQ->resp_buf || !out_buf ||
1078 midQ->mid_state != MID_RESPONSE_RECEIVED) {
1080 cifs_dbg(VFS, "Bad MID state?\n");
1084 *pbytes_returned = get_rfc1002_length(midQ->resp_buf);
1085 memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
1086 rc = cifs_check_receive(midQ, ses->server, 0);
1088 cifs_delete_mid(midQ);
1089 add_credits(ses->server, 1, 0);
1094 /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
1095 blocking lock to return. */
1098 send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon,
1099 struct smb_hdr *in_buf,
1100 struct smb_hdr *out_buf)
1103 struct cifs_ses *ses = tcon->ses;
1104 LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
1106 /* We just modify the current in_buf to change
1107 the type of lock from LOCKING_ANDX_SHARED_LOCK
1108 or LOCKING_ANDX_EXCLUSIVE_LOCK to
1109 LOCKING_ANDX_CANCEL_LOCK. */
1111 pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
1113 pSMB->hdr.Mid = get_next_mid(ses->server);
1115 return SendReceive(xid, ses, in_buf, out_buf,
1116 &bytes_returned, 0);
1120 SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon,
1121 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
1122 int *pbytes_returned)
1126 struct mid_q_entry *midQ;
1127 struct cifs_ses *ses;
1128 unsigned int len = be32_to_cpu(in_buf->smb_buf_length);
1129 struct kvec iov = { .iov_base = in_buf, .iov_len = len };
1130 struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 };
1132 if (tcon == NULL || tcon->ses == NULL) {
1133 cifs_dbg(VFS, "Null smb session\n");
1138 if (ses->server == NULL) {
1139 cifs_dbg(VFS, "Null tcp session\n");
1143 if (ses->server->tcpStatus == CifsExiting)
1146 /* Ensure that we do not send more than 50 overlapping requests
1147 to the same server. We may make this configurable later or
1150 if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
1151 cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n",
1156 rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0);
1160 /* make sure that we sign in the same order that we send on this socket
1161 and avoid races inside tcp sendmsg code that could cause corruption
1164 mutex_lock(&ses->server->srv_mutex);
1166 rc = allocate_mid(ses, in_buf, &midQ);
1168 mutex_unlock(&ses->server->srv_mutex);
1172 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
1174 cifs_delete_mid(midQ);
1175 mutex_unlock(&ses->server->srv_mutex);
1179 midQ->mid_state = MID_REQUEST_SUBMITTED;
1180 cifs_in_send_inc(ses->server);
1181 rc = smb_send(ses->server, in_buf, len);
1182 cifs_in_send_dec(ses->server);
1183 cifs_save_when_sent(midQ);
1186 ses->server->sequence_number -= 2;
1188 mutex_unlock(&ses->server->srv_mutex);
1191 cifs_delete_mid(midQ);
1195 /* Wait for a reply - allow signals to interrupt. */
1196 rc = wait_event_interruptible(ses->server->response_q,
1197 (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) ||
1198 ((ses->server->tcpStatus != CifsGood) &&
1199 (ses->server->tcpStatus != CifsNew)));
1201 /* Were we interrupted by a signal ? */
1202 if ((rc == -ERESTARTSYS) &&
1203 (midQ->mid_state == MID_REQUEST_SUBMITTED) &&
1204 ((ses->server->tcpStatus == CifsGood) ||
1205 (ses->server->tcpStatus == CifsNew))) {
1207 if (in_buf->Command == SMB_COM_TRANSACTION2) {
1208 /* POSIX lock. We send a NT_CANCEL SMB to cause the
1209 blocking lock to return. */
1210 rc = send_cancel(ses->server, &rqst, midQ);
1212 cifs_delete_mid(midQ);
1216 /* Windows lock. We send a LOCKINGX_CANCEL_LOCK
1217 to cause the blocking lock to return. */
1219 rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
1221 /* If we get -ENOLCK back the lock may have
1222 already been removed. Don't exit in this case. */
1223 if (rc && rc != -ENOLCK) {
1224 cifs_delete_mid(midQ);
1229 rc = wait_for_response(ses->server, midQ);
1231 send_cancel(ses->server, &rqst, midQ);
1232 spin_lock(&GlobalMid_Lock);
1233 if (midQ->mid_state == MID_REQUEST_SUBMITTED) {
1234 /* no longer considered to be "in-flight" */
1235 midQ->callback = DeleteMidQEntry;
1236 spin_unlock(&GlobalMid_Lock);
1239 spin_unlock(&GlobalMid_Lock);
1242 /* We got the response - restart system call. */
1246 rc = cifs_sync_mid_result(midQ, ses->server);
1250 /* rcvd frame is ok */
1251 if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) {
1253 cifs_dbg(VFS, "Bad MID state?\n");
1257 *pbytes_returned = get_rfc1002_length(midQ->resp_buf);
1258 memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
1259 rc = cifs_check_receive(midQ, ses->server, 0);
1261 cifs_delete_mid(midQ);
1262 if (rstart && rc == -EACCES)
1263 return -ERESTARTSYS;