summaryrefslogtreecommitdiff
path: root/fs/cifs/transport.c
blob: 0046c219833d6cfbef77e85addc663e1be71e290 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
/*
 *   fs/cifs/transport.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2005
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */

#include <linux/fs.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/net.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
#include <linux/mempool.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
  
extern mempool_t *cifs_mid_poolp;
extern kmem_cache_t *cifs_oplock_cachep;

static struct mid_q_entry *
AllocMidQEntry(struct smb_hdr *smb_buffer, struct cifsSesInfo *ses)
{
	struct mid_q_entry *temp;

	if (ses == NULL) {
		cERROR(1, ("Null session passed in to AllocMidQEntry"));
		return NULL;
	}
	if (ses->server == NULL) {
		cERROR(1, ("Null TCP session in AllocMidQEntry"));
		return NULL;
	}
	
	temp = (struct mid_q_entry *) mempool_alloc(cifs_mid_poolp,SLAB_KERNEL | SLAB_NOFS);
	if (temp == NULL)
		return temp;
	else {
		memset(temp, 0, sizeof (struct mid_q_entry));
		temp->mid = smb_buffer->Mid;	/* always LE */
		temp->pid = current->pid;
		temp->command = smb_buffer->Command;
		cFYI(1, ("For smb_command %d", temp->command));
		do_gettimeofday(&temp->when_sent);
		temp->ses = ses;
		temp->tsk = current;
	}

	spin_lock(&GlobalMid_Lock);
	list_add_tail(&temp->qhead, &ses->server->pending_mid_q);
	atomic_inc(&midCount);
	temp->midState = MID_REQUEST_ALLOCATED;
	spin_unlock(&GlobalMid_Lock);
	return temp;
}

static void
DeleteMidQEntry(struct mid_q_entry *midEntry)
{
	spin_lock(&GlobalMid_Lock);
	midEntry->midState = MID_FREE;
	list_del(&midEntry->qhead);
	atomic_dec(&midCount);
	spin_unlock(&GlobalMid_Lock);
	if(midEntry->largeBuf)
		cifs_buf_release(midEntry->resp_buf);
	else
		cifs_small_buf_release(midEntry->resp_buf);
	mempool_free(midEntry, cifs_mid_poolp);
}

struct oplock_q_entry *
AllocOplockQEntry(struct inode * pinode, __u16 fid, struct cifsTconInfo * tcon)
{
	struct oplock_q_entry *temp;
	if ((pinode== NULL) || (tcon == NULL)) {
		cERROR(1, ("Null parms passed to AllocOplockQEntry"));
		return NULL;
	}
	temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep,
						       SLAB_KERNEL);
	if (temp == NULL)
		return temp;
	else {
		temp->pinode = pinode;
		temp->tcon = tcon;
		temp->netfid = fid;
		spin_lock(&GlobalMid_Lock);
		list_add_tail(&temp->qhead, &GlobalOplock_Q);
		spin_unlock(&GlobalMid_Lock);
	}
	return temp;

}

void DeleteOplockQEntry(struct oplock_q_entry * oplockEntry)
{
	spin_lock(&GlobalMid_Lock); 
    /* should we check if list empty first? */
	list_del(&oplockEntry->qhead);
	spin_unlock(&GlobalMid_Lock);
	kmem_cache_free(cifs_oplock_cachep, oplockEntry);
}

int
smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer,
	 unsigned int smb_buf_length, struct sockaddr *sin)
{
	int rc = 0;
	int i = 0;
	struct msghdr smb_msg;
	struct kvec iov;
	unsigned len = smb_buf_length + 4;

	if(ssocket == NULL)
		return -ENOTSOCK; /* BB eventually add reconnect code here */
	iov.iov_base = smb_buffer;
	iov.iov_len = len;

	smb_msg.msg_name = sin;
	smb_msg.msg_namelen = sizeof (struct sockaddr);
	smb_msg.msg_control = NULL;
	smb_msg.msg_controllen = 0;
	smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/

	/* smb header is converted in header_assemble. bcc and rest of SMB word
	   area, and byte area if necessary, is converted to littleendian in 
	   cifssmb.c and RFC1001 len is converted to bigendian in smb_send 
	   Flags2 is converted in SendReceive */

	smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
	cFYI(1, ("Sending smb of length %d ", smb_buf_length));
	dump_smb(smb_buffer, len);

	while (len > 0) {
		rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len);
		if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
			i++;
			if(i > 60) {
				cERROR(1,
				   ("sends on sock %p stuck for 30 seconds",
				    ssocket));
				rc = -EAGAIN;
				break;
			}
			msleep(500);
			continue;
		}
		if (rc < 0) 
			break;
		iov.iov_base += rc;
		iov.iov_len -= rc;
		len -= rc;
	}

	if (rc < 0) {
		cERROR(1,("Error %d sending data on socket to server.", rc));
	} else {
		rc = 0;
	}

	return rc;
}

#ifdef CIFS_EXPERIMENTAL
/* BB finish off this function, adding support for writing set of pages as iovec */
/* and also adding support for operations that need to parse the response smb    */

int
smb_sendv(struct socket *ssocket, struct smb_hdr *smb_buffer,
	 unsigned int smb_buf_length, struct kvec * write_vector 
	  /* page list */, struct sockaddr *sin)
{
	int rc = 0;
	int i = 0;
	struct msghdr smb_msg;
	number_of_pages += 1; /* account for SMB header */
	struct kvec * piov  = kmalloc(number_of_pages * sizeof(struct kvec));
	unsigned len = smb_buf_length + 4;

	if(ssocket == NULL)
		return -ENOTSOCK; /* BB eventually add reconnect code here */
	iov.iov_base = smb_buffer;
	iov.iov_len = len;

	smb_msg.msg_name = sin;
	smb_msg.msg_namelen = sizeof (struct sockaddr);
	smb_msg.msg_control = NULL;
	smb_msg.msg_controllen = 0;
	smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/

	/* smb header is converted in header_assemble. bcc and rest of SMB word
	   area, and byte area if necessary, is converted to littleendian in 
	   cifssmb.c and RFC1001 len is converted to bigendian in smb_send 
	   Flags2 is converted in SendReceive */

	smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
	cFYI(1, ("Sending smb of length %d ", smb_buf_length));
	dump_smb(smb_buffer, len);

	while (len > 0) {
		rc = kernel_sendmsg(ssocket, &smb_msg, &iov, number_of_pages, 
				    len);
		if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
			i++;
			if(i > 60) {
				cERROR(1,
				   ("sends on sock %p stuck for 30 seconds",
				    ssocket));
				rc = -EAGAIN;
				break;
			}
			msleep(500);
			continue;
		}
		if (rc < 0) 
			break;
		iov.iov_base += rc;
		iov.iov_len -= rc;
		len -= rc;
	}

	if (rc < 0) {
		cERROR(1,("Error %d sending data on socket to server.", rc));
	} else {
		rc = 0;
	}

	return rc;
}


int
CIFSSendRcv(const unsigned int xid, struct cifsSesInfo *ses,
	    struct smb_hdr *in_buf, struct kvec * write_vector /* page list */, int *pbytes_returned, const int long_op)
{
	int rc = 0;
	unsigned long timeout = 15 * HZ;
	struct mid_q_entry *midQ = NULL;

	if (ses == NULL) {
		cERROR(1,("Null smb session"));
		return -EIO;
	}
	if(ses->server == NULL) {
		cERROR(1,("Null tcp session"));
		return -EIO;
	}
	if(pbytes_returned == NULL)
		return -EIO;
	else
		*pbytes_returned = 0;

  

	if(ses->server->tcpStatus == CIFS_EXITING)
		return -ENOENT;

	/* Ensure that we do not send more than 50 overlapping requests 
	   to the same server. We may make this configurable later or
	   use ses->maxReq */
	if(long_op == -1) {
		/* oplock breaks must not be held up */
		atomic_inc(&ses->server->inFlight);
	} else {
		spin_lock(&GlobalMid_Lock); 
		while(1) {        
			if(atomic_read(&ses->server->inFlight) >= cifs_max_pending){
				spin_unlock(&GlobalMid_Lock);
				wait_event(ses->server->request_q,
					atomic_read(&ses->server->inFlight)
					 < cifs_max_pending);
				spin_lock(&GlobalMid_Lock);
			} else {
				if(ses->server->tcpStatus == CifsExiting) {
					spin_unlock(&GlobalMid_Lock);
					return -ENOENT;
				}

			/* can not count locking commands against total since
			   they are allowed to block on server */
					
				if(long_op < 3) {
				/* update # of requests on the wire to server */
					atomic_inc(&ses->server->inFlight);
				}
				spin_unlock(&GlobalMid_Lock);
				break;
			}
		}
	}
	/* make sure that we sign in the same order that we send on this socket 
	   and avoid races inside tcp sendmsg code that could cause corruption
	   of smb data */

	down(&ses->server->tcpSem); 

	if (ses->server->tcpStatus == CifsExiting) {
		rc = -ENOENT;
		goto cifs_out_label;
	} else if (ses->server->tcpStatus == CifsNeedReconnect) {
		cFYI(1,("tcp session dead - return to caller to retry"));
		rc = -EAGAIN;
		goto cifs_out_label;
	} else if (ses->status != CifsGood) {
		/* check if SMB session is bad because we are setting it up */
		if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && 
			(in_buf->Command != SMB_COM_NEGOTIATE)) {
			rc = -EAGAIN;
			goto cifs_out_label;
		} /* else ok - we are setting up session */
	}
	midQ = AllocMidQEntry(in_buf, ses);
	if (midQ == NULL) {
		up(&ses->server->tcpSem);
		/* If not lock req, update # of requests on wire to server */
		if(long_op < 3) {
			atomic_dec(&ses->server->inFlight); 
			wake_up(&ses->server->request_q);
		}
		return -ENOMEM;
	}

	if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
		up(&ses->server->tcpSem);
		cERROR(1,
		       ("Illegal length, greater than maximum frame, %d ",
			in_buf->smb_buf_length));
		DeleteMidQEntry(midQ);
		/* If not lock req, update # of requests on wire to server */
		if(long_op < 3) {
			atomic_dec(&ses->server->inFlight); 
			wake_up(&ses->server->request_q);
		}
		return -EIO;
	}

	/* BB can we sign efficiently in this path? */
	rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);

	midQ->midState = MID_REQUEST_SUBMITTED;
/*	rc = smb_sendv(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
		       piovec, 
		       (struct sockaddr *) &(ses->server->addr.sockAddr));*/
	if(rc < 0) {
		DeleteMidQEntry(midQ);
		up(&ses->server->tcpSem);
		/* If not lock req, update # of requests on wire to server */
		if(long_op < 3) {
			atomic_dec(&ses->server->inFlight); 
			wake_up(&ses->server->request_q);
		}
		return rc;
	} else
		up(&ses->server->tcpSem);
cifs_out_label:
	if(midQ)
	        DeleteMidQEntry(midQ);
                                                                                                                           
	if(long_op < 3) {
		atomic_dec(&ses->server->inFlight);
		wake_up(&ses->server->request_q);
	}

	return rc;
}


#endif /* CIFS_EXPERIMENTAL */

int
SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
	    struct smb_hdr *in_buf, struct smb_hdr *out_buf,
	    int *pbytes_returned, const int long_op)
{
	int rc = 0;
	unsigned int receive_len;
	unsigned long timeout;
	struct mid_q_entry *midQ;

	if (ses == NULL) {
		cERROR(1,("Null smb session"));
		return -EIO;
	}
	if(ses->server == NULL) {
		cERROR(1,("Null tcp session"));
		return -EIO;
	}

	if(ses->server->tcpStatus == CifsExiting)
		return -ENOENT;

	/* Ensure that we do not send more than 50 overlapping requests 
	   to the same server. We may make this configurable later or
	   use ses->maxReq */
	if(long_op == -1) {
		/* oplock breaks must not be held up */
		atomic_inc(&ses->server->inFlight);
	} else {
		spin_lock(&GlobalMid_Lock); 
		while(1) {        
			if(atomic_read(&ses->server->inFlight) >= 
					cifs_max_pending){
				spin_unlock(&GlobalMid_Lock);
				wait_event(ses->server->request_q,
					atomic_read(&ses->server->inFlight)
					 < cifs_max_pending);
				spin_lock(&GlobalMid_Lock);
			} else {
				if(ses->server->tcpStatus == CifsExiting) {
					spin_unlock(&GlobalMid_Lock);
					return -ENOENT;
				}

			/* can not count locking commands against total since
			   they are allowed to block on server */
					
				if(long_op < 3) {
				/* update # of requests on the wire to server */
					atomic_inc(&ses->server->inFlight);
				}
				spin_unlock(&GlobalMid_Lock);
				break;
			}
		}
	}
	/* make sure that we sign in the same order that we send on this socket 
	   and avoid races inside tcp sendmsg code that could cause corruption
	   of smb data */

	down(&ses->server->tcpSem); 

	if (ses->server->tcpStatus == CifsExiting) {
		rc = -ENOENT;
		goto out_unlock;
	} else if (ses->server->tcpStatus == CifsNeedReconnect) {
		cFYI(1,("tcp session dead - return to caller to retry"));
		rc = -EAGAIN;
		goto out_unlock;
	} else if (ses->status != CifsGood) {
		/* check if SMB session is bad because we are setting it up */
		if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && 
			(in_buf->Command != SMB_COM_NEGOTIATE)) {
			rc = -EAGAIN;
			goto out_unlock;
		} /* else ok - we are setting up session */
	}
	midQ = AllocMidQEntry(in_buf, ses);
	if (midQ == NULL) {
		up(&ses->server->tcpSem);
		/* If not lock req, update # of requests on wire to server */
		if(long_op < 3) {
			atomic_dec(&ses->server->inFlight); 
			wake_up(&ses->server->request_q);
		}
		return -ENOMEM;
	}

	if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
		up(&ses->server->tcpSem);
		cERROR(1,
		       ("Illegal length, greater than maximum frame, %d ",
			in_buf->smb_buf_length));
		DeleteMidQEntry(midQ);
		/* If not lock req, update # of requests on wire to server */
		if(long_op < 3) {
			atomic_dec(&ses->server->inFlight); 
			wake_up(&ses->server->request_q);
		}
		return -EIO;
	}

	rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);

	midQ->midState = MID_REQUEST_SUBMITTED;
	rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
		      (struct sockaddr *) &(ses->server->addr.sockAddr));
	if(rc < 0) {
		DeleteMidQEntry(midQ);
		up(&ses->server->tcpSem);
		/* If not lock req, update # of requests on wire to server */
		if(long_op < 3) {
			atomic_dec(&ses->server->inFlight); 
			wake_up(&ses->server->request_q);
		}
		return rc;
	} else
		up(&ses->server->tcpSem);
	if (long_op == -1)
		goto cifs_no_response_exit;
	else if (long_op == 2) /* writes past end of file can take loong time */
		timeout = 300 * HZ;
	else if (long_op == 1)
		timeout = 45 * HZ; /* should be greater than 
			servers oplock break timeout (about 43 seconds) */
	else if (long_op > 2) {
		timeout = MAX_SCHEDULE_TIMEOUT;
	} else
		timeout = 15 * HZ;
	/* wait for 15 seconds or until woken up due to response arriving or 
	   due to last connection to this server being unmounted */
	if (signal_pending(current)) {
		/* if signal pending do not hold up user for full smb timeout
		but we still give response a change to complete */
		timeout = 2 * HZ;
	}   

	/* No user interrupts in wait - wreaks havoc with performance */
	if(timeout != MAX_SCHEDULE_TIMEOUT) {
		timeout += jiffies;
		wait_event(ses->server->response_q,
			(!(midQ->midState & MID_REQUEST_SUBMITTED)) || 
			time_after(jiffies, timeout) || 
			((ses->server->tcpStatus != CifsGood) &&
			 (ses->server->tcpStatus != CifsNew)));
	} else {
		wait_event(ses->server->response_q,
			(!(midQ->midState & MID_REQUEST_SUBMITTED)) || 
			((ses->server->tcpStatus != CifsGood) &&
			 (ses->server->tcpStatus != CifsNew)));
	}

	spin_lock(&GlobalMid_Lock);
	if (midQ->resp_buf) {
		spin_unlock(&GlobalMid_Lock);
		receive_len = be32_to_cpu(*(__be32 *)midQ->resp_buf);
	} else {
		cERROR(1,("No response buffer"));
		if(midQ->midState == MID_REQUEST_SUBMITTED) {
			if(ses->server->tcpStatus == CifsExiting)
				rc = -EHOSTDOWN;
			else {
				ses->server->tcpStatus = CifsNeedReconnect;
				midQ->midState = MID_RETRY_NEEDED;
			}
		}

		if (rc != -EHOSTDOWN) {
			if(midQ->midState == MID_RETRY_NEEDED) {
				rc = -EAGAIN;
				cFYI(1,("marking request for retry"));
			} else {
				rc = -EIO;
			}
		}
		spin_unlock(&GlobalMid_Lock);
		DeleteMidQEntry(midQ);
		/* If not lock req, update # of requests on wire to server */
		if(long_op < 3) {
			atomic_dec(&ses->server->inFlight); 
			wake_up(&ses->server->request_q);
		}
		return rc;
	}
  
	if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
		cERROR(1, ("Frame too large received.  Length: %d  Xid: %d",
			receive_len, xid));
		rc = -EIO;
	} else {		/* rcvd frame is ok */

		if (midQ->resp_buf && out_buf
		    && (midQ->midState == MID_RESPONSE_RECEIVED)) {
			out_buf->smb_buf_length = receive_len;
			memcpy((char *)out_buf + 4,
			       (char *)midQ->resp_buf + 4,
			       receive_len);

			dump_smb(out_buf, 92);
			/* convert the length into a more usable form */
			if((receive_len > 24) &&
			   (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
					SECMODE_SIGN_ENABLED))) {
				rc = cifs_verify_signature(out_buf,
						ses->server->mac_signing_key,
						midQ->sequence_number+1);
				if(rc) {
					cERROR(1,("Unexpected SMB signature"));
					/* BB FIXME add code to kill session */
				}
			}

			*pbytes_returned = out_buf->smb_buf_length;

			/* BB special case reconnect tid and uid here? */
			rc = map_smb_to_linux_error(out_buf);

			/* convert ByteCount if necessary */
			if (receive_len >=
			    sizeof (struct smb_hdr) -
			    4 /* do not count RFC1001 header */  +
			    (2 * out_buf->WordCount) + 2 /* bcc */ )
				BCC(out_buf) = le16_to_cpu(BCC(out_buf));
		} else {
			rc = -EIO;
			cFYI(1,("Bad MID state? "));
		}
	}
cifs_no_response_exit:
	DeleteMidQEntry(midQ);

	if(long_op < 3) {
		atomic_dec(&ses->server->inFlight); 
		wake_up(&ses->server->request_q);
	}

	return rc;

out_unlock:
	up(&ses->server->tcpSem);
	/* If not lock req, update # of requests on wire to server */
	if(long_op < 3) {
		atomic_dec(&ses->server->inFlight); 
		wake_up(&ses->server->request_q);
	}

	return rc;
}