xref: /linux/fs/smb/client/cifs_debug.c (revision a3a02a52bcfcbcc4a637d4b68bf1bc391c9fad02)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *
4  *   Copyright (C) International Business Machines  Corp., 2000,2005
5  *
6  *   Modified by Steve French (sfrench@us.ibm.com)
7  */
8 #include <linux/fs.h>
9 #include <linux/string.h>
10 #include <linux/ctype.h>
11 #include <linux/kstrtox.h>
12 #include <linux/module.h>
13 #include <linux/proc_fs.h>
14 #include <linux/uaccess.h>
15 #include <uapi/linux/ethtool.h>
16 #include "cifspdu.h"
17 #include "cifsglob.h"
18 #include "cifsproto.h"
19 #include "cifs_debug.h"
20 #include "cifsfs.h"
21 #include "fs_context.h"
22 #ifdef CONFIG_CIFS_DFS_UPCALL
23 #include "dfs_cache.h"
24 #endif
25 #ifdef CONFIG_CIFS_SMB_DIRECT
26 #include "smbdirect.h"
27 #endif
28 #include "cifs_swn.h"
29 
30 void
31 cifs_dump_mem(char *label, void *data, int length)
32 {
33 	pr_debug("%s: dump of %d bytes of data at 0x%p\n", label, length, data);
34 	print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 4,
35 		       data, length, true);
36 }
37 
38 void cifs_dump_detail(void *buf, struct TCP_Server_Info *server)
39 {
40 #ifdef CONFIG_CIFS_DEBUG2
41 	struct smb_hdr *smb = buf;
42 
43 	cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d Wct: %d\n",
44 		 smb->Command, smb->Status.CifsError, smb->Flags,
45 		 smb->Flags2, smb->Mid, smb->Pid, smb->WordCount);
46 	if (!server->ops->check_message(buf, server->total_read, server)) {
47 		cifs_dbg(VFS, "smb buf %p len %u\n", smb,
48 			 server->ops->calc_smb_size(smb));
49 	}
50 #endif /* CONFIG_CIFS_DEBUG2 */
51 }
52 
53 void cifs_dump_mids(struct TCP_Server_Info *server)
54 {
55 #ifdef CONFIG_CIFS_DEBUG2
56 	struct mid_q_entry *mid_entry;
57 
58 	if (server == NULL)
59 		return;
60 
61 	cifs_dbg(VFS, "Dump pending requests:\n");
62 	spin_lock(&server->mid_lock);
63 	list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
64 		cifs_dbg(VFS, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu\n",
65 			 mid_entry->mid_state,
66 			 le16_to_cpu(mid_entry->command),
67 			 mid_entry->pid,
68 			 mid_entry->callback_data,
69 			 mid_entry->mid);
70 #ifdef CONFIG_CIFS_STATS2
71 		cifs_dbg(VFS, "IsLarge: %d buf: %p time rcv: %ld now: %ld\n",
72 			 mid_entry->large_buf,
73 			 mid_entry->resp_buf,
74 			 mid_entry->when_received,
75 			 jiffies);
76 #endif /* STATS2 */
77 		cifs_dbg(VFS, "IsMult: %d IsEnd: %d\n",
78 			 mid_entry->multiRsp, mid_entry->multiEnd);
79 		if (mid_entry->resp_buf) {
80 			cifs_dump_detail(mid_entry->resp_buf, server);
81 			cifs_dump_mem("existing buf: ",
82 				mid_entry->resp_buf, 62);
83 		}
84 	}
85 	spin_unlock(&server->mid_lock);
86 #endif /* CONFIG_CIFS_DEBUG2 */
87 }
88 
89 #ifdef CONFIG_PROC_FS
90 static void cifs_debug_tcon(struct seq_file *m, struct cifs_tcon *tcon)
91 {
92 	__u32 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
93 
94 	seq_printf(m, "%s Mounts: %d ", tcon->tree_name, tcon->tc_count);
95 	if (tcon->nativeFileSystem)
96 		seq_printf(m, "Type: %s ", tcon->nativeFileSystem);
97 	seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x\n\tPathComponentMax: %d Status: %d",
98 		   le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
99 		   le32_to_cpu(tcon->fsAttrInfo.Attributes),
100 		   le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
101 		   tcon->status);
102 	if (dev_type == FILE_DEVICE_DISK)
103 		seq_puts(m, " type: DISK ");
104 	else if (dev_type == FILE_DEVICE_CD_ROM)
105 		seq_puts(m, " type: CDROM ");
106 	else
107 		seq_printf(m, " type: %d ", dev_type);
108 
109 	seq_printf(m, "Serial Number: 0x%x", tcon->vol_serial_number);
110 
111 	if ((tcon->seal) ||
112 	    (tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
113 	    (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
114 		seq_puts(m, " encrypted");
115 	if (tcon->nocase)
116 		seq_printf(m, " nocase");
117 	if (tcon->unix_ext)
118 		seq_printf(m, " POSIX Extensions");
119 	if (tcon->ses->server->ops->dump_share_caps)
120 		tcon->ses->server->ops->dump_share_caps(m, tcon);
121 	if (tcon->use_witness)
122 		seq_puts(m, " Witness");
123 	if (tcon->broken_sparse_sup)
124 		seq_puts(m, " nosparse");
125 	if (tcon->need_reconnect)
126 		seq_puts(m, "\tDISCONNECTED ");
127 	spin_lock(&tcon->tc_lock);
128 	if (tcon->origin_fullpath) {
129 		seq_printf(m, "\n\tDFS origin fullpath: %s",
130 			   tcon->origin_fullpath);
131 	}
132 	spin_unlock(&tcon->tc_lock);
133 	seq_putc(m, '\n');
134 }
135 
136 static void
137 cifs_dump_channel(struct seq_file *m, int i, struct cifs_chan *chan)
138 {
139 	struct TCP_Server_Info *server = chan->server;
140 
141 	if (!server) {
142 		seq_printf(m, "\n\n\t\tChannel: %d DISABLED", i+1);
143 		return;
144 	}
145 
146 	seq_printf(m, "\n\n\t\tChannel: %d ConnectionId: 0x%llx"
147 		   "\n\t\tNumber of credits: %d,%d,%d Dialect 0x%x"
148 		   "\n\t\tTCP status: %d Instance: %d"
149 		   "\n\t\tLocal Users To Server: %d SecMode: 0x%x Req On Wire: %d"
150 		   "\n\t\tIn Send: %d In MaxReq Wait: %d",
151 		   i+1, server->conn_id,
152 		   server->credits,
153 		   server->echo_credits,
154 		   server->oplock_credits,
155 		   server->dialect,
156 		   server->tcpStatus,
157 		   server->reconnect_instance,
158 		   server->srv_count,
159 		   server->sec_mode,
160 		   in_flight(server),
161 		   atomic_read(&server->in_send),
162 		   atomic_read(&server->num_waiters));
163 #ifdef CONFIG_NET_NS
164 	if (server->net)
165 		seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
166 #endif /* NET_NS */
167 
168 }
169 
170 static inline const char *smb_speed_to_str(size_t bps)
171 {
172 	size_t mbps = bps / 1000 / 1000;
173 
174 	switch (mbps) {
175 	case SPEED_10:
176 		return "10Mbps";
177 	case SPEED_100:
178 		return "100Mbps";
179 	case SPEED_1000:
180 		return "1Gbps";
181 	case SPEED_2500:
182 		return "2.5Gbps";
183 	case SPEED_5000:
184 		return "5Gbps";
185 	case SPEED_10000:
186 		return "10Gbps";
187 	case SPEED_14000:
188 		return "14Gbps";
189 	case SPEED_20000:
190 		return "20Gbps";
191 	case SPEED_25000:
192 		return "25Gbps";
193 	case SPEED_40000:
194 		return "40Gbps";
195 	case SPEED_50000:
196 		return "50Gbps";
197 	case SPEED_56000:
198 		return "56Gbps";
199 	case SPEED_100000:
200 		return "100Gbps";
201 	case SPEED_200000:
202 		return "200Gbps";
203 	case SPEED_400000:
204 		return "400Gbps";
205 	case SPEED_800000:
206 		return "800Gbps";
207 	default:
208 		return "Unknown";
209 	}
210 }
211 
212 static void
213 cifs_dump_iface(struct seq_file *m, struct cifs_server_iface *iface)
214 {
215 	struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
216 	struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
217 
218 	seq_printf(m, "\tSpeed: %s\n", smb_speed_to_str(iface->speed));
219 	seq_puts(m, "\t\tCapabilities: ");
220 	if (iface->rdma_capable)
221 		seq_puts(m, "rdma ");
222 	if (iface->rss_capable)
223 		seq_puts(m, "rss ");
224 	if (!iface->rdma_capable && !iface->rss_capable)
225 		seq_puts(m, "None");
226 	seq_putc(m, '\n');
227 	if (iface->sockaddr.ss_family == AF_INET)
228 		seq_printf(m, "\t\tIPv4: %pI4\n", &ipv4->sin_addr);
229 	else if (iface->sockaddr.ss_family == AF_INET6)
230 		seq_printf(m, "\t\tIPv6: %pI6\n", &ipv6->sin6_addr);
231 	if (!iface->is_active)
232 		seq_puts(m, "\t\t[for-cleanup]\n");
233 }
234 
235 static int cifs_debug_files_proc_show(struct seq_file *m, void *v)
236 {
237 	struct TCP_Server_Info *server;
238 	struct cifs_ses *ses;
239 	struct cifs_tcon *tcon;
240 	struct cifsFileInfo *cfile;
241 
242 	seq_puts(m, "# Version:1\n");
243 	seq_puts(m, "# Format:\n");
244 	seq_puts(m, "# <tree id> <ses id> <persistent fid> <flags> <count> <pid> <uid>");
245 #ifdef CONFIG_CIFS_DEBUG2
246 	seq_printf(m, " <filename> <mid>\n");
247 #else
248 	seq_printf(m, " <filename>\n");
249 #endif /* CIFS_DEBUG2 */
250 	spin_lock(&cifs_tcp_ses_lock);
251 	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
252 		list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
253 			if (cifs_ses_exiting(ses))
254 				continue;
255 			list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
256 				spin_lock(&tcon->open_file_lock);
257 				list_for_each_entry(cfile, &tcon->openFileList, tlist) {
258 					seq_printf(m,
259 						"0x%x 0x%llx 0x%llx 0x%x %d %d %d %pd",
260 						tcon->tid,
261 						ses->Suid,
262 						cfile->fid.persistent_fid,
263 						cfile->f_flags,
264 						cfile->count,
265 						cfile->pid,
266 						from_kuid(&init_user_ns, cfile->uid),
267 						cfile->dentry);
268 #ifdef CONFIG_CIFS_DEBUG2
269 					seq_printf(m, " %llu\n", cfile->fid.mid);
270 #else
271 					seq_printf(m, "\n");
272 #endif /* CIFS_DEBUG2 */
273 				}
274 				spin_unlock(&tcon->open_file_lock);
275 			}
276 		}
277 	}
278 	spin_unlock(&cifs_tcp_ses_lock);
279 	seq_putc(m, '\n');
280 	return 0;
281 }
282 
283 static __always_inline const char *compression_alg_str(__le16 alg)
284 {
285 	switch (alg) {
286 	case SMB3_COMPRESS_NONE:
287 		return "NONE";
288 	case SMB3_COMPRESS_LZNT1:
289 		return "LZNT1";
290 	case SMB3_COMPRESS_LZ77:
291 		return "LZ77";
292 	case SMB3_COMPRESS_LZ77_HUFF:
293 		return "LZ77-Huffman";
294 	case SMB3_COMPRESS_PATTERN:
295 		return "Pattern_V1";
296 	default:
297 		return "invalid";
298 	}
299 }
300 
301 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
302 {
303 	struct mid_q_entry *mid_entry;
304 	struct TCP_Server_Info *server;
305 	struct TCP_Server_Info *chan_server;
306 	struct cifs_ses *ses;
307 	struct cifs_tcon *tcon;
308 	struct cifs_server_iface *iface;
309 	size_t iface_weight = 0, iface_min_speed = 0;
310 	struct cifs_server_iface *last_iface = NULL;
311 	int c, i, j;
312 
313 	seq_puts(m,
314 		    "Display Internal CIFS Data Structures for Debugging\n"
315 		    "---------------------------------------------------\n");
316 	seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
317 	seq_printf(m, "Features:");
318 #ifdef CONFIG_CIFS_DFS_UPCALL
319 	seq_printf(m, " DFS");
320 #endif
321 #ifdef CONFIG_CIFS_FSCACHE
322 	seq_printf(m, ",FSCACHE");
323 #endif
324 #ifdef CONFIG_CIFS_SMB_DIRECT
325 	seq_printf(m, ",SMB_DIRECT");
326 #endif
327 #ifdef CONFIG_CIFS_STATS2
328 	seq_printf(m, ",STATS2");
329 #else
330 	seq_printf(m, ",STATS");
331 #endif
332 #ifdef CONFIG_CIFS_DEBUG2
333 	seq_printf(m, ",DEBUG2");
334 #elif defined(CONFIG_CIFS_DEBUG)
335 	seq_printf(m, ",DEBUG");
336 #endif
337 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
338 	seq_printf(m, ",ALLOW_INSECURE_LEGACY");
339 #endif
340 #ifdef CONFIG_CIFS_POSIX
341 	seq_printf(m, ",CIFS_POSIX");
342 #endif
343 #ifdef CONFIG_CIFS_UPCALL
344 	seq_printf(m, ",UPCALL(SPNEGO)");
345 #endif
346 #ifdef CONFIG_CIFS_XATTR
347 	seq_printf(m, ",XATTR");
348 #endif
349 	seq_printf(m, ",ACL");
350 #ifdef CONFIG_CIFS_SWN_UPCALL
351 	seq_puts(m, ",WITNESS");
352 #endif
353 	seq_putc(m, '\n');
354 	seq_printf(m, "CIFSMaxBufSize: %d\n", CIFSMaxBufSize);
355 	seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
356 
357 	seq_printf(m, "\nServers: ");
358 
359 	c = 0;
360 	spin_lock(&cifs_tcp_ses_lock);
361 	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
362 		/* channel info will be printed as a part of sessions below */
363 		if (SERVER_IS_CHAN(server))
364 			continue;
365 
366 		c++;
367 		seq_printf(m, "\n%d) ConnectionId: 0x%llx ",
368 			c, server->conn_id);
369 
370 		spin_lock(&server->srv_lock);
371 		if (server->hostname)
372 			seq_printf(m, "Hostname: %s ", server->hostname);
373 		seq_printf(m, "\nClientGUID: %pUL", server->client_guid);
374 		spin_unlock(&server->srv_lock);
375 #ifdef CONFIG_CIFS_SMB_DIRECT
376 		if (!server->rdma)
377 			goto skip_rdma;
378 
379 		if (!server->smbd_conn) {
380 			seq_printf(m, "\nSMBDirect transport not available");
381 			goto skip_rdma;
382 		}
383 
384 		seq_printf(m, "\nSMBDirect (in hex) protocol version: %x "
385 			"transport status: %x",
386 			server->smbd_conn->protocol,
387 			server->smbd_conn->transport_status);
388 		seq_printf(m, "\nConn receive_credit_max: %x "
389 			"send_credit_target: %x max_send_size: %x",
390 			server->smbd_conn->receive_credit_max,
391 			server->smbd_conn->send_credit_target,
392 			server->smbd_conn->max_send_size);
393 		seq_printf(m, "\nConn max_fragmented_recv_size: %x "
394 			"max_fragmented_send_size: %x max_receive_size:%x",
395 			server->smbd_conn->max_fragmented_recv_size,
396 			server->smbd_conn->max_fragmented_send_size,
397 			server->smbd_conn->max_receive_size);
398 		seq_printf(m, "\nConn keep_alive_interval: %x "
399 			"max_readwrite_size: %x rdma_readwrite_threshold: %x",
400 			server->smbd_conn->keep_alive_interval,
401 			server->smbd_conn->max_readwrite_size,
402 			server->smbd_conn->rdma_readwrite_threshold);
403 		seq_printf(m, "\nDebug count_get_receive_buffer: %x "
404 			"count_put_receive_buffer: %x count_send_empty: %x",
405 			server->smbd_conn->count_get_receive_buffer,
406 			server->smbd_conn->count_put_receive_buffer,
407 			server->smbd_conn->count_send_empty);
408 		seq_printf(m, "\nRead Queue count_reassembly_queue: %x "
409 			"count_enqueue_reassembly_queue: %x "
410 			"count_dequeue_reassembly_queue: %x "
411 			"fragment_reassembly_remaining: %x "
412 			"reassembly_data_length: %x "
413 			"reassembly_queue_length: %x",
414 			server->smbd_conn->count_reassembly_queue,
415 			server->smbd_conn->count_enqueue_reassembly_queue,
416 			server->smbd_conn->count_dequeue_reassembly_queue,
417 			server->smbd_conn->fragment_reassembly_remaining,
418 			server->smbd_conn->reassembly_data_length,
419 			server->smbd_conn->reassembly_queue_length);
420 		seq_printf(m, "\nCurrent Credits send_credits: %x "
421 			"receive_credits: %x receive_credit_target: %x",
422 			atomic_read(&server->smbd_conn->send_credits),
423 			atomic_read(&server->smbd_conn->receive_credits),
424 			server->smbd_conn->receive_credit_target);
425 		seq_printf(m, "\nPending send_pending: %x ",
426 			atomic_read(&server->smbd_conn->send_pending));
427 		seq_printf(m, "\nReceive buffers count_receive_queue: %x "
428 			"count_empty_packet_queue: %x",
429 			server->smbd_conn->count_receive_queue,
430 			server->smbd_conn->count_empty_packet_queue);
431 		seq_printf(m, "\nMR responder_resources: %x "
432 			"max_frmr_depth: %x mr_type: %x",
433 			server->smbd_conn->responder_resources,
434 			server->smbd_conn->max_frmr_depth,
435 			server->smbd_conn->mr_type);
436 		seq_printf(m, "\nMR mr_ready_count: %x mr_used_count: %x",
437 			atomic_read(&server->smbd_conn->mr_ready_count),
438 			atomic_read(&server->smbd_conn->mr_used_count));
439 skip_rdma:
440 #endif
441 		seq_printf(m, "\nNumber of credits: %d,%d,%d Dialect 0x%x",
442 			server->credits,
443 			server->echo_credits,
444 			server->oplock_credits,
445 			server->dialect);
446 		if (server->sign)
447 			seq_printf(m, " signed");
448 		if (server->posix_ext_supported)
449 			seq_printf(m, " posix");
450 		if (server->nosharesock)
451 			seq_printf(m, " nosharesock");
452 
453 		seq_printf(m, "\nServer capabilities: 0x%x", server->capabilities);
454 
455 		if (server->rdma)
456 			seq_printf(m, "\nRDMA ");
457 		seq_printf(m, "\nTCP status: %d Instance: %d"
458 				"\nLocal Users To Server: %d SecMode: 0x%x Req On Wire: %d",
459 				server->tcpStatus,
460 				server->reconnect_instance,
461 				server->srv_count,
462 				server->sec_mode, in_flight(server));
463 #ifdef CONFIG_NET_NS
464 		if (server->net)
465 			seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
466 #endif /* NET_NS */
467 
468 		seq_printf(m, "\nIn Send: %d In MaxReq Wait: %d",
469 				atomic_read(&server->in_send),
470 				atomic_read(&server->num_waiters));
471 
472 		if (server->leaf_fullpath) {
473 			seq_printf(m, "\nDFS leaf full path: %s",
474 				   server->leaf_fullpath);
475 		}
476 
477 		seq_puts(m, "\nCompression: ");
478 		if (!server->compression.requested)
479 			seq_puts(m, "disabled on mount");
480 		else if (server->compression.enabled)
481 			seq_printf(m, "enabled (%s)", compression_alg_str(server->compression.alg));
482 		else
483 			seq_puts(m, "disabled (not supported by this server)");
484 
485 		seq_printf(m, "\n\n\tSessions: ");
486 		i = 0;
487 		list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
488 			spin_lock(&ses->ses_lock);
489 			if (ses->ses_status == SES_EXITING) {
490 				spin_unlock(&ses->ses_lock);
491 				continue;
492 			}
493 			i++;
494 			if ((ses->serverDomain == NULL) ||
495 				(ses->serverOS == NULL) ||
496 				(ses->serverNOS == NULL)) {
497 				seq_printf(m, "\n\t%d) Address: %s Uses: %d Capability: 0x%x\tSession Status: %d ",
498 					i, ses->ip_addr, ses->ses_count,
499 					ses->capabilities, ses->ses_status);
500 				if (ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
501 					seq_printf(m, "Guest ");
502 				else if (ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
503 					seq_printf(m, "Anonymous ");
504 			} else {
505 				seq_printf(m,
506 				    "\n\t%d) Name: %s  Domain: %s Uses: %d OS: %s "
507 				    "\n\tNOS: %s\tCapability: 0x%x"
508 					"\n\tSMB session status: %d ",
509 				i, ses->ip_addr, ses->serverDomain,
510 				ses->ses_count, ses->serverOS, ses->serverNOS,
511 				ses->capabilities, ses->ses_status);
512 			}
513 			if (ses->expired_pwd)
514 				seq_puts(m, "password no longer valid ");
515 			spin_unlock(&ses->ses_lock);
516 
517 			seq_printf(m, "\n\tSecurity type: %s ",
518 				get_security_type_str(server->ops->select_sectype(server, ses->sectype)));
519 
520 			/* dump session id helpful for use with network trace */
521 			seq_printf(m, " SessionId: 0x%llx", ses->Suid);
522 			if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) {
523 				seq_puts(m, " encrypted");
524 				/* can help in debugging to show encryption type */
525 				if (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
526 					seq_puts(m, "(gcm256)");
527 			}
528 			if (ses->sign)
529 				seq_puts(m, " signed");
530 
531 			seq_printf(m, "\n\tUser: %d Cred User: %d",
532 				   from_kuid(&init_user_ns, ses->linux_uid),
533 				   from_kuid(&init_user_ns, ses->cred_uid));
534 
535 			if (ses->dfs_root_ses) {
536 				seq_printf(m, "\n\tDFS root session id: 0x%llx",
537 					   ses->dfs_root_ses->Suid);
538 			}
539 
540 			spin_lock(&ses->chan_lock);
541 			if (CIFS_CHAN_NEEDS_RECONNECT(ses, 0))
542 				seq_puts(m, "\tPrimary channel: DISCONNECTED ");
543 			if (CIFS_CHAN_IN_RECONNECT(ses, 0))
544 				seq_puts(m, "\t[RECONNECTING] ");
545 
546 			if (ses->chan_count > 1) {
547 				seq_printf(m, "\n\n\tExtra Channels: %zu ",
548 					   ses->chan_count-1);
549 				for (j = 1; j < ses->chan_count; j++) {
550 					cifs_dump_channel(m, j, &ses->chans[j]);
551 					if (CIFS_CHAN_NEEDS_RECONNECT(ses, j))
552 						seq_puts(m, "\tDISCONNECTED ");
553 					if (CIFS_CHAN_IN_RECONNECT(ses, j))
554 						seq_puts(m, "\t[RECONNECTING] ");
555 				}
556 			}
557 			spin_unlock(&ses->chan_lock);
558 
559 			seq_puts(m, "\n\n\tShares: ");
560 			j = 0;
561 
562 			seq_printf(m, "\n\t%d) IPC: ", j);
563 			if (ses->tcon_ipc)
564 				cifs_debug_tcon(m, ses->tcon_ipc);
565 			else
566 				seq_puts(m, "none\n");
567 
568 			list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
569 				++j;
570 				seq_printf(m, "\n\t%d) ", j);
571 				cifs_debug_tcon(m, tcon);
572 			}
573 
574 			spin_lock(&ses->iface_lock);
575 			if (ses->iface_count)
576 				seq_printf(m, "\n\n\tServer interfaces: %zu"
577 					   "\tLast updated: %lu seconds ago",
578 					   ses->iface_count,
579 					   (jiffies - ses->iface_last_update) / HZ);
580 
581 			last_iface = list_last_entry(&ses->iface_list,
582 						     struct cifs_server_iface,
583 						     iface_head);
584 			iface_min_speed = last_iface->speed;
585 
586 			j = 0;
587 			list_for_each_entry(iface, &ses->iface_list,
588 						 iface_head) {
589 				seq_printf(m, "\n\t%d)", ++j);
590 				cifs_dump_iface(m, iface);
591 
592 				iface_weight = iface->speed / iface_min_speed;
593 				seq_printf(m, "\t\tWeight (cur,total): (%zu,%zu)"
594 					   "\n\t\tAllocated channels: %u\n",
595 					   iface->weight_fulfilled,
596 					   iface_weight,
597 					   iface->num_channels);
598 
599 				if (is_ses_using_iface(ses, iface))
600 					seq_puts(m, "\t\t[CONNECTED]\n");
601 			}
602 			spin_unlock(&ses->iface_lock);
603 
604 			seq_puts(m, "\n\n\tMIDs: ");
605 			spin_lock(&ses->chan_lock);
606 			for (j = 0; j < ses->chan_count; j++) {
607 				chan_server = ses->chans[j].server;
608 				if (!chan_server)
609 					continue;
610 
611 				if (list_empty(&chan_server->pending_mid_q))
612 					continue;
613 
614 				seq_printf(m, "\n\tServer ConnectionId: 0x%llx",
615 					   chan_server->conn_id);
616 				spin_lock(&chan_server->mid_lock);
617 				list_for_each_entry(mid_entry, &chan_server->pending_mid_q, qhead) {
618 					seq_printf(m, "\n\t\tState: %d com: %d pid: %d cbdata: %p mid %llu",
619 						   mid_entry->mid_state,
620 						   le16_to_cpu(mid_entry->command),
621 						   mid_entry->pid,
622 						   mid_entry->callback_data,
623 						   mid_entry->mid);
624 				}
625 				spin_unlock(&chan_server->mid_lock);
626 			}
627 			spin_unlock(&ses->chan_lock);
628 			seq_puts(m, "\n--\n");
629 		}
630 		if (i == 0)
631 			seq_printf(m, "\n\t\t[NONE]");
632 	}
633 	if (c == 0)
634 		seq_printf(m, "\n\t[NONE]");
635 
636 	spin_unlock(&cifs_tcp_ses_lock);
637 	seq_putc(m, '\n');
638 	cifs_swn_dump(m);
639 
640 	/* BB add code to dump additional info such as TCP session info now */
641 	return 0;
642 }
643 
644 static ssize_t cifs_stats_proc_write(struct file *file,
645 		const char __user *buffer, size_t count, loff_t *ppos)
646 {
647 	bool bv;
648 	int rc;
649 	struct TCP_Server_Info *server;
650 	struct cifs_ses *ses;
651 	struct cifs_tcon *tcon;
652 
653 	rc = kstrtobool_from_user(buffer, count, &bv);
654 	if (rc == 0) {
655 #ifdef CONFIG_CIFS_STATS2
656 		int i;
657 
658 		atomic_set(&total_buf_alloc_count, 0);
659 		atomic_set(&total_small_buf_alloc_count, 0);
660 #endif /* CONFIG_CIFS_STATS2 */
661 		atomic_set(&tcpSesReconnectCount, 0);
662 		atomic_set(&tconInfoReconnectCount, 0);
663 
664 		spin_lock(&GlobalMid_Lock);
665 		GlobalMaxActiveXid = 0;
666 		GlobalCurrentXid = 0;
667 		spin_unlock(&GlobalMid_Lock);
668 		spin_lock(&cifs_tcp_ses_lock);
669 		list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
670 			server->max_in_flight = 0;
671 #ifdef CONFIG_CIFS_STATS2
672 			for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
673 				atomic_set(&server->num_cmds[i], 0);
674 				atomic_set(&server->smb2slowcmd[i], 0);
675 				server->time_per_cmd[i] = 0;
676 				server->slowest_cmd[i] = 0;
677 				server->fastest_cmd[0] = 0;
678 			}
679 #endif /* CONFIG_CIFS_STATS2 */
680 			list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
681 				if (cifs_ses_exiting(ses))
682 					continue;
683 				list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
684 					atomic_set(&tcon->num_smbs_sent, 0);
685 					spin_lock(&tcon->stat_lock);
686 					tcon->bytes_read = 0;
687 					tcon->bytes_written = 0;
688 					tcon->stats_from_time = ktime_get_real_seconds();
689 					spin_unlock(&tcon->stat_lock);
690 					if (server->ops->clear_stats)
691 						server->ops->clear_stats(tcon);
692 				}
693 			}
694 		}
695 		spin_unlock(&cifs_tcp_ses_lock);
696 	} else {
697 		return rc;
698 	}
699 
700 	return count;
701 }
702 
703 static int cifs_stats_proc_show(struct seq_file *m, void *v)
704 {
705 	int i;
706 #ifdef CONFIG_CIFS_STATS2
707 	int j;
708 #endif /* STATS2 */
709 	struct TCP_Server_Info *server;
710 	struct cifs_ses *ses;
711 	struct cifs_tcon *tcon;
712 
713 	seq_printf(m, "Resources in use\nCIFS Session: %d\n",
714 			sesInfoAllocCount.counter);
715 	seq_printf(m, "Share (unique mount targets): %d\n",
716 			tconInfoAllocCount.counter);
717 	seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
718 			buf_alloc_count.counter,
719 			cifs_min_rcv + tcpSesAllocCount.counter);
720 	seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
721 			small_buf_alloc_count.counter, cifs_min_small);
722 #ifdef CONFIG_CIFS_STATS2
723 	seq_printf(m, "Total Large %d Small %d Allocations\n",
724 				atomic_read(&total_buf_alloc_count),
725 				atomic_read(&total_small_buf_alloc_count));
726 #endif /* CONFIG_CIFS_STATS2 */
727 
728 	seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&mid_count));
729 	seq_printf(m,
730 		"\n%d session %d share reconnects\n",
731 		tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
732 
733 	seq_printf(m,
734 		"Total vfs operations: %d maximum at one time: %d\n",
735 		GlobalCurrentXid, GlobalMaxActiveXid);
736 
737 	i = 0;
738 	spin_lock(&cifs_tcp_ses_lock);
739 	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
740 		seq_printf(m, "\nMax requests in flight: %d", server->max_in_flight);
741 #ifdef CONFIG_CIFS_STATS2
742 		seq_puts(m, "\nTotal time spent processing by command. Time ");
743 		seq_printf(m, "units are jiffies (%d per second)\n", HZ);
744 		seq_puts(m, "  SMB3 CMD\tNumber\tTotal Time\tFastest\tSlowest\n");
745 		seq_puts(m, "  --------\t------\t----------\t-------\t-------\n");
746 		for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
747 			seq_printf(m, "  %d\t\t%d\t%llu\t\t%u\t%u\n", j,
748 				atomic_read(&server->num_cmds[j]),
749 				server->time_per_cmd[j],
750 				server->fastest_cmd[j],
751 				server->slowest_cmd[j]);
752 		for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
753 			if (atomic_read(&server->smb2slowcmd[j])) {
754 				spin_lock(&server->srv_lock);
755 				seq_printf(m, "  %d slow responses from %s for command %d\n",
756 					atomic_read(&server->smb2slowcmd[j]),
757 					server->hostname, j);
758 				spin_unlock(&server->srv_lock);
759 			}
760 #endif /* STATS2 */
761 		list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
762 			if (cifs_ses_exiting(ses))
763 				continue;
764 			list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
765 				i++;
766 				seq_printf(m, "\n%d) %s", i, tcon->tree_name);
767 				if (tcon->need_reconnect)
768 					seq_puts(m, "\tDISCONNECTED ");
769 				seq_printf(m, "\nSMBs: %d since %ptTs UTC",
770 					   atomic_read(&tcon->num_smbs_sent),
771 					   &tcon->stats_from_time);
772 				if (server->ops->print_stats)
773 					server->ops->print_stats(m, tcon);
774 			}
775 		}
776 	}
777 	spin_unlock(&cifs_tcp_ses_lock);
778 
779 	seq_putc(m, '\n');
780 	return 0;
781 }
782 
783 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
784 {
785 	return single_open(file, cifs_stats_proc_show, NULL);
786 }
787 
788 static const struct proc_ops cifs_stats_proc_ops = {
789 	.proc_open	= cifs_stats_proc_open,
790 	.proc_read	= seq_read,
791 	.proc_lseek	= seq_lseek,
792 	.proc_release	= single_release,
793 	.proc_write	= cifs_stats_proc_write,
794 };
795 
796 #ifdef CONFIG_CIFS_SMB_DIRECT
797 #define PROC_FILE_DEFINE(name) \
798 static ssize_t name##_write(struct file *file, const char __user *buffer, \
799 	size_t count, loff_t *ppos) \
800 { \
801 	int rc; \
802 	rc = kstrtoint_from_user(buffer, count, 10, &name); \
803 	if (rc) \
804 		return rc; \
805 	return count; \
806 } \
807 static int name##_proc_show(struct seq_file *m, void *v) \
808 { \
809 	seq_printf(m, "%d\n", name); \
810 	return 0; \
811 } \
812 static int name##_open(struct inode *inode, struct file *file) \
813 { \
814 	return single_open(file, name##_proc_show, NULL); \
815 } \
816 \
817 static const struct proc_ops cifs_##name##_proc_fops = { \
818 	.proc_open	= name##_open, \
819 	.proc_read	= seq_read, \
820 	.proc_lseek	= seq_lseek, \
821 	.proc_release	= single_release, \
822 	.proc_write	= name##_write, \
823 }
824 
825 PROC_FILE_DEFINE(rdma_readwrite_threshold);
826 PROC_FILE_DEFINE(smbd_max_frmr_depth);
827 PROC_FILE_DEFINE(smbd_keep_alive_interval);
828 PROC_FILE_DEFINE(smbd_max_receive_size);
829 PROC_FILE_DEFINE(smbd_max_fragmented_recv_size);
830 PROC_FILE_DEFINE(smbd_max_send_size);
831 PROC_FILE_DEFINE(smbd_send_credit_target);
832 PROC_FILE_DEFINE(smbd_receive_credit_max);
833 #endif
834 
835 static struct proc_dir_entry *proc_fs_cifs;
836 static const struct proc_ops cifsFYI_proc_ops;
837 static const struct proc_ops cifs_lookup_cache_proc_ops;
838 static const struct proc_ops traceSMB_proc_ops;
839 static const struct proc_ops cifs_security_flags_proc_ops;
840 static const struct proc_ops cifs_linux_ext_proc_ops;
841 static const struct proc_ops cifs_mount_params_proc_ops;
842 
843 void
844 cifs_proc_init(void)
845 {
846 	proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
847 	if (proc_fs_cifs == NULL)
848 		return;
849 
850 	proc_create_single("DebugData", 0, proc_fs_cifs,
851 			cifs_debug_data_proc_show);
852 
853 	proc_create_single("open_files", 0400, proc_fs_cifs,
854 			cifs_debug_files_proc_show);
855 
856 	proc_create("Stats", 0644, proc_fs_cifs, &cifs_stats_proc_ops);
857 	proc_create("cifsFYI", 0644, proc_fs_cifs, &cifsFYI_proc_ops);
858 	proc_create("traceSMB", 0644, proc_fs_cifs, &traceSMB_proc_ops);
859 	proc_create("LinuxExtensionsEnabled", 0644, proc_fs_cifs,
860 		    &cifs_linux_ext_proc_ops);
861 	proc_create("SecurityFlags", 0644, proc_fs_cifs,
862 		    &cifs_security_flags_proc_ops);
863 	proc_create("LookupCacheEnabled", 0644, proc_fs_cifs,
864 		    &cifs_lookup_cache_proc_ops);
865 
866 	proc_create("mount_params", 0444, proc_fs_cifs, &cifs_mount_params_proc_ops);
867 
868 #ifdef CONFIG_CIFS_DFS_UPCALL
869 	proc_create("dfscache", 0644, proc_fs_cifs, &dfscache_proc_ops);
870 #endif
871 
872 #ifdef CONFIG_CIFS_SMB_DIRECT
873 	proc_create("rdma_readwrite_threshold", 0644, proc_fs_cifs,
874 		&cifs_rdma_readwrite_threshold_proc_fops);
875 	proc_create("smbd_max_frmr_depth", 0644, proc_fs_cifs,
876 		&cifs_smbd_max_frmr_depth_proc_fops);
877 	proc_create("smbd_keep_alive_interval", 0644, proc_fs_cifs,
878 		&cifs_smbd_keep_alive_interval_proc_fops);
879 	proc_create("smbd_max_receive_size", 0644, proc_fs_cifs,
880 		&cifs_smbd_max_receive_size_proc_fops);
881 	proc_create("smbd_max_fragmented_recv_size", 0644, proc_fs_cifs,
882 		&cifs_smbd_max_fragmented_recv_size_proc_fops);
883 	proc_create("smbd_max_send_size", 0644, proc_fs_cifs,
884 		&cifs_smbd_max_send_size_proc_fops);
885 	proc_create("smbd_send_credit_target", 0644, proc_fs_cifs,
886 		&cifs_smbd_send_credit_target_proc_fops);
887 	proc_create("smbd_receive_credit_max", 0644, proc_fs_cifs,
888 		&cifs_smbd_receive_credit_max_proc_fops);
889 #endif
890 }
891 
892 void
893 cifs_proc_clean(void)
894 {
895 	if (proc_fs_cifs == NULL)
896 		return;
897 
898 	remove_proc_entry("DebugData", proc_fs_cifs);
899 	remove_proc_entry("open_files", proc_fs_cifs);
900 	remove_proc_entry("cifsFYI", proc_fs_cifs);
901 	remove_proc_entry("traceSMB", proc_fs_cifs);
902 	remove_proc_entry("Stats", proc_fs_cifs);
903 	remove_proc_entry("SecurityFlags", proc_fs_cifs);
904 	remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
905 	remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
906 	remove_proc_entry("mount_params", proc_fs_cifs);
907 
908 #ifdef CONFIG_CIFS_DFS_UPCALL
909 	remove_proc_entry("dfscache", proc_fs_cifs);
910 #endif
911 #ifdef CONFIG_CIFS_SMB_DIRECT
912 	remove_proc_entry("rdma_readwrite_threshold", proc_fs_cifs);
913 	remove_proc_entry("smbd_max_frmr_depth", proc_fs_cifs);
914 	remove_proc_entry("smbd_keep_alive_interval", proc_fs_cifs);
915 	remove_proc_entry("smbd_max_receive_size", proc_fs_cifs);
916 	remove_proc_entry("smbd_max_fragmented_recv_size", proc_fs_cifs);
917 	remove_proc_entry("smbd_max_send_size", proc_fs_cifs);
918 	remove_proc_entry("smbd_send_credit_target", proc_fs_cifs);
919 	remove_proc_entry("smbd_receive_credit_max", proc_fs_cifs);
920 #endif
921 	remove_proc_entry("fs/cifs", NULL);
922 }
923 
924 static int cifsFYI_proc_show(struct seq_file *m, void *v)
925 {
926 	seq_printf(m, "%d\n", cifsFYI);
927 	return 0;
928 }
929 
930 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
931 {
932 	return single_open(file, cifsFYI_proc_show, NULL);
933 }
934 
935 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
936 		size_t count, loff_t *ppos)
937 {
938 	char c[2] = { '\0' };
939 	bool bv;
940 	int rc;
941 
942 	rc = get_user(c[0], buffer);
943 	if (rc)
944 		return rc;
945 	if (kstrtobool(c, &bv) == 0)
946 		cifsFYI = bv;
947 	else if ((c[0] > '1') && (c[0] <= '9'))
948 		cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
949 	else
950 		return -EINVAL;
951 
952 	return count;
953 }
954 
955 static const struct proc_ops cifsFYI_proc_ops = {
956 	.proc_open	= cifsFYI_proc_open,
957 	.proc_read	= seq_read,
958 	.proc_lseek	= seq_lseek,
959 	.proc_release	= single_release,
960 	.proc_write	= cifsFYI_proc_write,
961 };
962 
963 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
964 {
965 	seq_printf(m, "%d\n", linuxExtEnabled);
966 	return 0;
967 }
968 
969 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
970 {
971 	return single_open(file, cifs_linux_ext_proc_show, NULL);
972 }
973 
974 static ssize_t cifs_linux_ext_proc_write(struct file *file,
975 		const char __user *buffer, size_t count, loff_t *ppos)
976 {
977 	int rc;
978 
979 	rc = kstrtobool_from_user(buffer, count, &linuxExtEnabled);
980 	if (rc)
981 		return rc;
982 
983 	return count;
984 }
985 
986 static const struct proc_ops cifs_linux_ext_proc_ops = {
987 	.proc_open	= cifs_linux_ext_proc_open,
988 	.proc_read	= seq_read,
989 	.proc_lseek	= seq_lseek,
990 	.proc_release	= single_release,
991 	.proc_write	= cifs_linux_ext_proc_write,
992 };
993 
994 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
995 {
996 	seq_printf(m, "%d\n", lookupCacheEnabled);
997 	return 0;
998 }
999 
1000 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
1001 {
1002 	return single_open(file, cifs_lookup_cache_proc_show, NULL);
1003 }
1004 
1005 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
1006 		const char __user *buffer, size_t count, loff_t *ppos)
1007 {
1008 	int rc;
1009 
1010 	rc = kstrtobool_from_user(buffer, count, &lookupCacheEnabled);
1011 	if (rc)
1012 		return rc;
1013 
1014 	return count;
1015 }
1016 
1017 static const struct proc_ops cifs_lookup_cache_proc_ops = {
1018 	.proc_open	= cifs_lookup_cache_proc_open,
1019 	.proc_read	= seq_read,
1020 	.proc_lseek	= seq_lseek,
1021 	.proc_release	= single_release,
1022 	.proc_write	= cifs_lookup_cache_proc_write,
1023 };
1024 
1025 static int traceSMB_proc_show(struct seq_file *m, void *v)
1026 {
1027 	seq_printf(m, "%d\n", traceSMB);
1028 	return 0;
1029 }
1030 
1031 static int traceSMB_proc_open(struct inode *inode, struct file *file)
1032 {
1033 	return single_open(file, traceSMB_proc_show, NULL);
1034 }
1035 
1036 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
1037 		size_t count, loff_t *ppos)
1038 {
1039 	int rc;
1040 
1041 	rc = kstrtobool_from_user(buffer, count, &traceSMB);
1042 	if (rc)
1043 		return rc;
1044 
1045 	return count;
1046 }
1047 
1048 static const struct proc_ops traceSMB_proc_ops = {
1049 	.proc_open	= traceSMB_proc_open,
1050 	.proc_read	= seq_read,
1051 	.proc_lseek	= seq_lseek,
1052 	.proc_release	= single_release,
1053 	.proc_write	= traceSMB_proc_write,
1054 };
1055 
1056 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
1057 {
1058 	seq_printf(m, "0x%x\n", global_secflags);
1059 	return 0;
1060 }
1061 
1062 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
1063 {
1064 	return single_open(file, cifs_security_flags_proc_show, NULL);
1065 }
1066 
1067 /*
1068  * Ensure that if someone sets a MUST flag, that we disable all other MAY
1069  * flags except for the ones corresponding to the given MUST flag. If there are
1070  * multiple MUST flags, then try to prefer more secure ones.
1071  */
1072 static void
1073 cifs_security_flags_handle_must_flags(unsigned int *flags)
1074 {
1075 	unsigned int signflags = *flags & (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL);
1076 
1077 	if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
1078 		*flags = CIFSSEC_MUST_KRB5;
1079 	else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
1080 		*flags = CIFSSEC_MUST_NTLMSSP;
1081 	else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
1082 		*flags = CIFSSEC_MUST_NTLMV2;
1083 
1084 	*flags |= signflags;
1085 }
1086 
1087 static ssize_t cifs_security_flags_proc_write(struct file *file,
1088 		const char __user *buffer, size_t count, loff_t *ppos)
1089 {
1090 	int rc;
1091 	unsigned int flags;
1092 	char flags_string[12];
1093 	bool bv;
1094 
1095 	if ((count < 1) || (count > 11))
1096 		return -EINVAL;
1097 
1098 	memset(flags_string, 0, 12);
1099 
1100 	if (copy_from_user(flags_string, buffer, count))
1101 		return -EFAULT;
1102 
1103 	if (count < 3) {
1104 		/* single char or single char followed by null */
1105 		if (kstrtobool(flags_string, &bv) == 0) {
1106 			global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
1107 			return count;
1108 		} else if (!isdigit(flags_string[0])) {
1109 			cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
1110 					flags_string);
1111 			return -EINVAL;
1112 		}
1113 	}
1114 
1115 	/* else we have a number */
1116 	rc = kstrtouint(flags_string, 0, &flags);
1117 	if (rc) {
1118 		cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
1119 				flags_string);
1120 		return rc;
1121 	}
1122 
1123 	cifs_dbg(FYI, "sec flags 0x%x\n", flags);
1124 
1125 	if (flags == 0)  {
1126 		cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
1127 		return -EINVAL;
1128 	}
1129 
1130 	if (flags & ~CIFSSEC_MASK) {
1131 		cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
1132 			 flags & ~CIFSSEC_MASK);
1133 		return -EINVAL;
1134 	}
1135 
1136 	cifs_security_flags_handle_must_flags(&flags);
1137 
1138 	/* flags look ok - update the global security flags for cifs module */
1139 	global_secflags = flags;
1140 	if (global_secflags & CIFSSEC_MUST_SIGN) {
1141 		/* requiring signing implies signing is allowed */
1142 		global_secflags |= CIFSSEC_MAY_SIGN;
1143 		cifs_dbg(FYI, "packet signing now required\n");
1144 	} else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
1145 		cifs_dbg(FYI, "packet signing disabled\n");
1146 	}
1147 	/* BB should we turn on MAY flags for other MUST options? */
1148 	return count;
1149 }
1150 
1151 static const struct proc_ops cifs_security_flags_proc_ops = {
1152 	.proc_open	= cifs_security_flags_proc_open,
1153 	.proc_read	= seq_read,
1154 	.proc_lseek	= seq_lseek,
1155 	.proc_release	= single_release,
1156 	.proc_write	= cifs_security_flags_proc_write,
1157 };
1158 
1159 /* To make it easier to debug, can help to show mount params */
1160 static int cifs_mount_params_proc_show(struct seq_file *m, void *v)
1161 {
1162 	const struct fs_parameter_spec *p;
1163 	const char *type;
1164 
1165 	for (p = smb3_fs_parameters; p->name; p++) {
1166 		/* cannot use switch with pointers... */
1167 		if (!p->type) {
1168 			if (p->flags == fs_param_neg_with_no)
1169 				type = "noflag";
1170 			else
1171 				type = "flag";
1172 		} else if (p->type == fs_param_is_bool)
1173 			type = "bool";
1174 		else if (p->type == fs_param_is_u32)
1175 			type = "u32";
1176 		else if (p->type == fs_param_is_u64)
1177 			type = "u64";
1178 		else if (p->type == fs_param_is_string)
1179 			type = "string";
1180 		else
1181 			type = "unknown";
1182 
1183 		seq_printf(m, "%s:%s\n", p->name, type);
1184 	}
1185 
1186 	return 0;
1187 }
1188 
1189 static int cifs_mount_params_proc_open(struct inode *inode, struct file *file)
1190 {
1191 	return single_open(file, cifs_mount_params_proc_show, NULL);
1192 }
1193 
1194 static const struct proc_ops cifs_mount_params_proc_ops = {
1195 	.proc_open	= cifs_mount_params_proc_open,
1196 	.proc_read	= seq_read,
1197 	.proc_lseek	= seq_lseek,
1198 	.proc_release	= single_release,
1199 	/* No need for write for now */
1200 	/* .proc_write	= cifs_mount_params_proc_write, */
1201 };
1202 
1203 #else
1204 inline void cifs_proc_init(void)
1205 {
1206 }
1207 
1208 inline void cifs_proc_clean(void)
1209 {
1210 }
1211 #endif /* PROC_FS */
1212