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Linux/fs/cifs/smb2ops.c

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  1 /*
  2  *  SMB2 version specific operations
  3  *
  4  *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
  5  *
  6  *  This library is free software; you can redistribute it and/or modify
  7  *  it under the terms of the GNU General Public License v2 as published
  8  *  by the Free Software Foundation.
  9  *
 10  *  This library is distributed in the hope that it will be useful,
 11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 13  *  the GNU Lesser General Public License for more details.
 14  *
 15  *  You should have received a copy of the GNU Lesser General Public License
 16  *  along with this library; if not, write to the Free Software
 17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 18  */
 19 
 20 #include <linux/pagemap.h>
 21 #include <linux/vfs.h>
 22 #include <linux/falloc.h>
 23 #include <linux/scatterlist.h>
 24 #include <linux/uuid.h>
 25 #include <crypto/aead.h>
 26 #include "cifsglob.h"
 27 #include "smb2pdu.h"
 28 #include "smb2proto.h"
 29 #include "cifsproto.h"
 30 #include "cifs_debug.h"
 31 #include "cifs_unicode.h"
 32 #include "smb2status.h"
 33 #include "smb2glob.h"
 34 #include "cifs_ioctl.h"
 35 #include "smbdirect.h"
 36 
 37 /* Change credits for different ops and return the total number of credits */
 38 static int
 39 change_conf(struct TCP_Server_Info *server)
 40 {
 41         server->credits += server->echo_credits + server->oplock_credits;
 42         server->oplock_credits = server->echo_credits = 0;
 43         switch (server->credits) {
 44         case 0:
 45                 return 0;
 46         case 1:
 47                 server->echoes = false;
 48                 server->oplocks = false;
 49                 break;
 50         case 2:
 51                 server->echoes = true;
 52                 server->oplocks = false;
 53                 server->echo_credits = 1;
 54                 break;
 55         default:
 56                 server->echoes = true;
 57                 if (enable_oplocks) {
 58                         server->oplocks = true;
 59                         server->oplock_credits = 1;
 60                 } else
 61                         server->oplocks = false;
 62 
 63                 server->echo_credits = 1;
 64         }
 65         server->credits -= server->echo_credits + server->oplock_credits;
 66         return server->credits + server->echo_credits + server->oplock_credits;
 67 }
 68 
 69 static void
 70 smb2_add_credits(struct TCP_Server_Info *server,
 71                  const struct cifs_credits *credits, const int optype)
 72 {
 73         int *val, rc = -1;
 74         unsigned int add = credits->value;
 75         unsigned int instance = credits->instance;
 76         bool reconnect_detected = false;
 77 
 78         spin_lock(&server->req_lock);
 79         val = server->ops->get_credits_field(server, optype);
 80 
 81         /* eg found case where write overlapping reconnect messed up credits */
 82         if (((optype & CIFS_OP_MASK) == CIFS_NEG_OP) && (*val != 0))
 83                 trace_smb3_reconnect_with_invalid_credits(server->CurrentMid,
 84                         server->hostname, *val);
 85         if ((instance == 0) || (instance == server->reconnect_instance))
 86                 *val += add;
 87         else
 88                 reconnect_detected = true;
 89 
 90         if (*val > 65000) {
 91                 *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
 92                 printk_once(KERN_WARNING "server overflowed SMB3 credits\n");
 93         }
 94         server->in_flight--;
 95         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
 96                 rc = change_conf(server);
 97         /*
 98          * Sometimes server returns 0 credits on oplock break ack - we need to
 99          * rebalance credits in this case.
100          */
101         else if (server->in_flight > 0 && server->oplock_credits == 0 &&
102                  server->oplocks) {
103                 if (server->credits > 1) {
104                         server->credits--;
105                         server->oplock_credits++;
106                 }
107         }
108         spin_unlock(&server->req_lock);
109         wake_up(&server->request_q);
110 
111         if (reconnect_detected)
112                 cifs_dbg(FYI, "trying to put %d credits from the old server instance %d\n",
113                          add, instance);
114 
115         if (server->tcpStatus == CifsNeedReconnect
116             || server->tcpStatus == CifsExiting)
117                 return;
118 
119         switch (rc) {
120         case -1:
121                 /* change_conf hasn't been executed */
122                 break;
123         case 0:
124                 cifs_dbg(VFS, "Possible client or server bug - zero credits\n");
125                 break;
126         case 1:
127                 cifs_dbg(VFS, "disabling echoes and oplocks\n");
128                 break;
129         case 2:
130                 cifs_dbg(FYI, "disabling oplocks\n");
131                 break;
132         default:
133                 cifs_dbg(FYI, "add %u credits total=%d\n", add, rc);
134         }
135 }
136 
137 static void
138 smb2_set_credits(struct TCP_Server_Info *server, const int val)
139 {
140         spin_lock(&server->req_lock);
141         server->credits = val;
142         if (val == 1)
143                 server->reconnect_instance++;
144         spin_unlock(&server->req_lock);
145         /* don't log while holding the lock */
146         if (val == 1)
147                 cifs_dbg(FYI, "set credits to 1 due to smb2 reconnect\n");
148 }
149 
150 static int *
151 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
152 {
153         switch (optype) {
154         case CIFS_ECHO_OP:
155                 return &server->echo_credits;
156         case CIFS_OBREAK_OP:
157                 return &server->oplock_credits;
158         default:
159                 return &server->credits;
160         }
161 }
162 
163 static unsigned int
164 smb2_get_credits(struct mid_q_entry *mid)
165 {
166         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)mid->resp_buf;
167 
168         if (mid->mid_state == MID_RESPONSE_RECEIVED
169             || mid->mid_state == MID_RESPONSE_MALFORMED)
170                 return le16_to_cpu(shdr->CreditRequest);
171 
172         return 0;
173 }
174 
175 static int
176 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
177                       unsigned int *num, struct cifs_credits *credits)
178 {
179         int rc = 0;
180         unsigned int scredits;
181 
182         spin_lock(&server->req_lock);
183         while (1) {
184                 if (server->credits <= 0) {
185                         spin_unlock(&server->req_lock);
186                         cifs_num_waiters_inc(server);
187                         rc = wait_event_killable(server->request_q,
188                                 has_credits(server, &server->credits, 1));
189                         cifs_num_waiters_dec(server);
190                         if (rc)
191                                 return rc;
192                         spin_lock(&server->req_lock);
193                 } else {
194                         if (server->tcpStatus == CifsExiting) {
195                                 spin_unlock(&server->req_lock);
196                                 return -ENOENT;
197                         }
198 
199                         scredits = server->credits;
200                         /* can deadlock with reopen */
201                         if (scredits <= 8) {
202                                 *num = SMB2_MAX_BUFFER_SIZE;
203                                 credits->value = 0;
204                                 credits->instance = 0;
205                                 break;
206                         }
207 
208                         /* leave some credits for reopen and other ops */
209                         scredits -= 8;
210                         *num = min_t(unsigned int, size,
211                                      scredits * SMB2_MAX_BUFFER_SIZE);
212 
213                         credits->value =
214                                 DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
215                         credits->instance = server->reconnect_instance;
216                         server->credits -= credits->value;
217                         server->in_flight++;
218                         break;
219                 }
220         }
221         spin_unlock(&server->req_lock);
222         return rc;
223 }
224 
225 static int
226 smb2_adjust_credits(struct TCP_Server_Info *server,
227                     struct cifs_credits *credits,
228                     const unsigned int payload_size)
229 {
230         int new_val = DIV_ROUND_UP(payload_size, SMB2_MAX_BUFFER_SIZE);
231 
232         if (!credits->value || credits->value == new_val)
233                 return 0;
234 
235         if (credits->value < new_val) {
236                 WARN_ONCE(1, "request has less credits (%d) than required (%d)",
237                           credits->value, new_val);
238                 return -ENOTSUPP;
239         }
240 
241         spin_lock(&server->req_lock);
242 
243         if (server->reconnect_instance != credits->instance) {
244                 spin_unlock(&server->req_lock);
245                 cifs_dbg(VFS, "trying to return %d credits to old session\n",
246                          credits->value - new_val);
247                 return -EAGAIN;
248         }
249 
250         server->credits += credits->value - new_val;
251         spin_unlock(&server->req_lock);
252         wake_up(&server->request_q);
253         credits->value = new_val;
254         return 0;
255 }
256 
257 static __u64
258 smb2_get_next_mid(struct TCP_Server_Info *server)
259 {
260         __u64 mid;
261         /* for SMB2 we need the current value */
262         spin_lock(&GlobalMid_Lock);
263         mid = server->CurrentMid++;
264         spin_unlock(&GlobalMid_Lock);
265         return mid;
266 }
267 
268 static void
269 smb2_revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
270 {
271         spin_lock(&GlobalMid_Lock);
272         if (server->CurrentMid >= val)
273                 server->CurrentMid -= val;
274         spin_unlock(&GlobalMid_Lock);
275 }
276 
277 static struct mid_q_entry *
278 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
279 {
280         struct mid_q_entry *mid;
281         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
282         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
283 
284         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
285                 cifs_dbg(VFS, "encrypted frame parsing not supported yet");
286                 return NULL;
287         }
288 
289         spin_lock(&GlobalMid_Lock);
290         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
291                 if ((mid->mid == wire_mid) &&
292                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
293                     (mid->command == shdr->Command)) {
294                         kref_get(&mid->refcount);
295                         spin_unlock(&GlobalMid_Lock);
296                         return mid;
297                 }
298         }
299         spin_unlock(&GlobalMid_Lock);
300         return NULL;
301 }
302 
303 static void
304 smb2_dump_detail(void *buf, struct TCP_Server_Info *server)
305 {
306 #ifdef CONFIG_CIFS_DEBUG2
307         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
308 
309         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
310                  shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
311                  shdr->ProcessId);
312         cifs_dbg(VFS, "smb buf %p len %u\n", buf,
313                  server->ops->calc_smb_size(buf, server));
314 #endif
315 }
316 
317 static bool
318 smb2_need_neg(struct TCP_Server_Info *server)
319 {
320         return server->max_read == 0;
321 }
322 
323 static int
324 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
325 {
326         int rc;
327         ses->server->CurrentMid = 0;
328         rc = SMB2_negotiate(xid, ses);
329         /* BB we probably don't need to retry with modern servers */
330         if (rc == -EAGAIN)
331                 rc = -EHOSTDOWN;
332         return rc;
333 }
334 
335 static unsigned int
336 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
337 {
338         struct TCP_Server_Info *server = tcon->ses->server;
339         unsigned int wsize;
340 
341         /* start with specified wsize, or default */
342         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
343         wsize = min_t(unsigned int, wsize, server->max_write);
344 #ifdef CONFIG_CIFS_SMB_DIRECT
345         if (server->rdma) {
346                 if (server->sign)
347                         wsize = min_t(unsigned int,
348                                 wsize, server->smbd_conn->max_fragmented_send_size);
349                 else
350                         wsize = min_t(unsigned int,
351                                 wsize, server->smbd_conn->max_readwrite_size);
352         }
353 #endif
354         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
355                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
356 
357         return wsize;
358 }
359 
360 static unsigned int
361 smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
362 {
363         struct TCP_Server_Info *server = tcon->ses->server;
364         unsigned int wsize;
365 
366         /* start with specified wsize, or default */
367         wsize = volume_info->wsize ? volume_info->wsize : SMB3_DEFAULT_IOSIZE;
368         wsize = min_t(unsigned int, wsize, server->max_write);
369 #ifdef CONFIG_CIFS_SMB_DIRECT
370         if (server->rdma) {
371                 if (server->sign)
372                         wsize = min_t(unsigned int,
373                                 wsize, server->smbd_conn->max_fragmented_send_size);
374                 else
375                         wsize = min_t(unsigned int,
376                                 wsize, server->smbd_conn->max_readwrite_size);
377         }
378 #endif
379         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
380                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
381 
382         return wsize;
383 }
384 
385 static unsigned int
386 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
387 {
388         struct TCP_Server_Info *server = tcon->ses->server;
389         unsigned int rsize;
390 
391         /* start with specified rsize, or default */
392         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
393         rsize = min_t(unsigned int, rsize, server->max_read);
394 #ifdef CONFIG_CIFS_SMB_DIRECT
395         if (server->rdma) {
396                 if (server->sign)
397                         rsize = min_t(unsigned int,
398                                 rsize, server->smbd_conn->max_fragmented_recv_size);
399                 else
400                         rsize = min_t(unsigned int,
401                                 rsize, server->smbd_conn->max_readwrite_size);
402         }
403 #endif
404 
405         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
406                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
407 
408         return rsize;
409 }
410 
411 static unsigned int
412 smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
413 {
414         struct TCP_Server_Info *server = tcon->ses->server;
415         unsigned int rsize;
416 
417         /* start with specified rsize, or default */
418         rsize = volume_info->rsize ? volume_info->rsize : SMB3_DEFAULT_IOSIZE;
419         rsize = min_t(unsigned int, rsize, server->max_read);
420 #ifdef CONFIG_CIFS_SMB_DIRECT
421         if (server->rdma) {
422                 if (server->sign)
423                         rsize = min_t(unsigned int,
424                                 rsize, server->smbd_conn->max_fragmented_recv_size);
425                 else
426                         rsize = min_t(unsigned int,
427                                 rsize, server->smbd_conn->max_readwrite_size);
428         }
429 #endif
430 
431         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
432                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
433 
434         return rsize;
435 }
436 
437 static int
438 parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
439                         size_t buf_len,
440                         struct cifs_server_iface **iface_list,
441                         size_t *iface_count)
442 {
443         struct network_interface_info_ioctl_rsp *p;
444         struct sockaddr_in *addr4;
445         struct sockaddr_in6 *addr6;
446         struct iface_info_ipv4 *p4;
447         struct iface_info_ipv6 *p6;
448         struct cifs_server_iface *info;
449         ssize_t bytes_left;
450         size_t next = 0;
451         int nb_iface = 0;
452         int rc = 0;
453 
454         *iface_list = NULL;
455         *iface_count = 0;
456 
457         /*
458          * Fist pass: count and sanity check
459          */
460 
461         bytes_left = buf_len;
462         p = buf;
463         while (bytes_left >= sizeof(*p)) {
464                 nb_iface++;
465                 next = le32_to_cpu(p->Next);
466                 if (!next) {
467                         bytes_left -= sizeof(*p);
468                         break;
469                 }
470                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
471                 bytes_left -= next;
472         }
473 
474         if (!nb_iface) {
475                 cifs_dbg(VFS, "%s: malformed interface info\n", __func__);
476                 rc = -EINVAL;
477                 goto out;
478         }
479 
480         if (bytes_left || p->Next)
481                 cifs_dbg(VFS, "%s: incomplete interface info\n", __func__);
482 
483 
484         /*
485          * Second pass: extract info to internal structure
486          */
487 
488         *iface_list = kcalloc(nb_iface, sizeof(**iface_list), GFP_KERNEL);
489         if (!*iface_list) {
490                 rc = -ENOMEM;
491                 goto out;
492         }
493 
494         info = *iface_list;
495         bytes_left = buf_len;
496         p = buf;
497         while (bytes_left >= sizeof(*p)) {
498                 info->speed = le64_to_cpu(p->LinkSpeed);
499                 info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE);
500                 info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE);
501 
502                 cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, *iface_count);
503                 cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
504                 cifs_dbg(FYI, "%s: capabilities 0x%08x\n", __func__,
505                          le32_to_cpu(p->Capability));
506 
507                 switch (p->Family) {
508                 /*
509                  * The kernel and wire socket structures have the same
510                  * layout and use network byte order but make the
511                  * conversion explicit in case either one changes.
512                  */
513                 case INTERNETWORK:
514                         addr4 = (struct sockaddr_in *)&info->sockaddr;
515                         p4 = (struct iface_info_ipv4 *)p->Buffer;
516                         addr4->sin_family = AF_INET;
517                         memcpy(&addr4->sin_addr, &p4->IPv4Address, 4);
518 
519                         /* [MS-SMB2] 2.2.32.5.1.1 Clients MUST ignore these */
520                         addr4->sin_port = cpu_to_be16(CIFS_PORT);
521 
522                         cifs_dbg(FYI, "%s: ipv4 %pI4\n", __func__,
523                                  &addr4->sin_addr);
524                         break;
525                 case INTERNETWORKV6:
526                         addr6 = (struct sockaddr_in6 *)&info->sockaddr;
527                         p6 = (struct iface_info_ipv6 *)p->Buffer;
528                         addr6->sin6_family = AF_INET6;
529                         memcpy(&addr6->sin6_addr, &p6->IPv6Address, 16);
530 
531                         /* [MS-SMB2] 2.2.32.5.1.2 Clients MUST ignore these */
532                         addr6->sin6_flowinfo = 0;
533                         addr6->sin6_scope_id = 0;
534                         addr6->sin6_port = cpu_to_be16(CIFS_PORT);
535 
536                         cifs_dbg(FYI, "%s: ipv6 %pI6\n", __func__,
537                                  &addr6->sin6_addr);
538                         break;
539                 default:
540                         cifs_dbg(VFS,
541                                  "%s: skipping unsupported socket family\n",
542                                  __func__);
543                         goto next_iface;
544                 }
545 
546                 (*iface_count)++;
547                 info++;
548 next_iface:
549                 next = le32_to_cpu(p->Next);
550                 if (!next)
551                         break;
552                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
553                 bytes_left -= next;
554         }
555 
556         if (!*iface_count) {
557                 rc = -EINVAL;
558                 goto out;
559         }
560 
561 out:
562         if (rc) {
563                 kfree(*iface_list);
564                 *iface_count = 0;
565                 *iface_list = NULL;
566         }
567         return rc;
568 }
569 
570 
571 static int
572 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
573 {
574         int rc;
575         unsigned int ret_data_len = 0;
576         struct network_interface_info_ioctl_rsp *out_buf = NULL;
577         struct cifs_server_iface *iface_list;
578         size_t iface_count;
579         struct cifs_ses *ses = tcon->ses;
580 
581         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
582                         FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
583                         NULL /* no data input */, 0 /* no data input */,
584                         CIFSMaxBufSize, (char **)&out_buf, &ret_data_len);
585         if (rc == -EOPNOTSUPP) {
586                 cifs_dbg(FYI,
587                          "server does not support query network interfaces\n");
588                 goto out;
589         } else if (rc != 0) {
590                 cifs_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
591                 goto out;
592         }
593 
594         rc = parse_server_interfaces(out_buf, ret_data_len,
595                                      &iface_list, &iface_count);
596         if (rc)
597                 goto out;
598 
599         spin_lock(&ses->iface_lock);
600         kfree(ses->iface_list);
601         ses->iface_list = iface_list;
602         ses->iface_count = iface_count;
603         ses->iface_last_update = jiffies;
604         spin_unlock(&ses->iface_lock);
605 
606 out:
607         kfree(out_buf);
608         return rc;
609 }
610 
611 static void
612 smb2_close_cached_fid(struct kref *ref)
613 {
614         struct cached_fid *cfid = container_of(ref, struct cached_fid,
615                                                refcount);
616 
617         if (cfid->is_valid) {
618                 cifs_dbg(FYI, "clear cached root file handle\n");
619                 SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid,
620                            cfid->fid->volatile_fid);
621                 cfid->is_valid = false;
622                 cfid->file_all_info_is_valid = false;
623         }
624 }
625 
626 void close_shroot(struct cached_fid *cfid)
627 {
628         mutex_lock(&cfid->fid_mutex);
629         kref_put(&cfid->refcount, smb2_close_cached_fid);
630         mutex_unlock(&cfid->fid_mutex);
631 }
632 
633 void
634 smb2_cached_lease_break(struct work_struct *work)
635 {
636         struct cached_fid *cfid = container_of(work,
637                                 struct cached_fid, lease_break);
638 
639         close_shroot(cfid);
640 }
641 
642 /*
643  * Open the directory at the root of a share
644  */
645 int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
646 {
647         struct cifs_ses *ses = tcon->ses;
648         struct TCP_Server_Info *server = ses->server;
649         struct cifs_open_parms oparms;
650         struct smb2_create_rsp *o_rsp = NULL;
651         struct smb2_query_info_rsp *qi_rsp = NULL;
652         int resp_buftype[2];
653         struct smb_rqst rqst[2];
654         struct kvec rsp_iov[2];
655         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
656         struct kvec qi_iov[1];
657         int rc, flags = 0;
658         __le16 utf16_path = 0; /* Null - since an open of top of share */
659         u8 oplock = SMB2_OPLOCK_LEVEL_II;
660 
661         mutex_lock(&tcon->crfid.fid_mutex);
662         if (tcon->crfid.is_valid) {
663                 cifs_dbg(FYI, "found a cached root file handle\n");
664                 memcpy(pfid, tcon->crfid.fid, sizeof(struct cifs_fid));
665                 kref_get(&tcon->crfid.refcount);
666                 mutex_unlock(&tcon->crfid.fid_mutex);
667                 return 0;
668         }
669 
670         if (smb3_encryption_required(tcon))
671                 flags |= CIFS_TRANSFORM_REQ;
672 
673         memset(rqst, 0, sizeof(rqst));
674         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
675         memset(rsp_iov, 0, sizeof(rsp_iov));
676 
677         /* Open */
678         memset(&open_iov, 0, sizeof(open_iov));
679         rqst[0].rq_iov = open_iov;
680         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
681 
682         oparms.tcon = tcon;
683         oparms.create_options = 0;
684         oparms.desired_access = FILE_READ_ATTRIBUTES;
685         oparms.disposition = FILE_OPEN;
686         oparms.fid = pfid;
687         oparms.reconnect = false;
688 
689         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, &utf16_path);
690         if (rc)
691                 goto oshr_exit;
692         smb2_set_next_command(tcon, &rqst[0]);
693 
694         memset(&qi_iov, 0, sizeof(qi_iov));
695         rqst[1].rq_iov = qi_iov;
696         rqst[1].rq_nvec = 1;
697 
698         rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
699                                   COMPOUND_FID, FILE_ALL_INFORMATION,
700                                   SMB2_O_INFO_FILE, 0,
701                                   sizeof(struct smb2_file_all_info) +
702                                   PATH_MAX * 2, 0, NULL);
703         if (rc)
704                 goto oshr_exit;
705 
706         smb2_set_related(&rqst[1]);
707 
708         /*
709          * We do not hold the lock for the open because in case
710          * SMB2_open needs to reconnect, it will end up calling
711          * cifs_mark_open_files_invalid() which takes the lock again
712          * thus causing a deadlock
713          */
714 
715         mutex_unlock(&tcon->crfid.fid_mutex);
716         rc = compound_send_recv(xid, ses, flags, 2, rqst,
717                                 resp_buftype, rsp_iov);
718         mutex_lock(&tcon->crfid.fid_mutex);
719 
720         /*
721          * Now we need to check again as the cached root might have
722          * been successfully re-opened from a concurrent process
723          */
724 
725         if (tcon->crfid.is_valid) {
726                 /* work was already done */
727 
728                 /* stash fids for close() later */
729                 struct cifs_fid fid = {
730                         .persistent_fid = pfid->persistent_fid,
731                         .volatile_fid = pfid->volatile_fid,
732                 };
733 
734                 /*
735                  * caller expects this func to set pfid to a valid
736                  * cached root, so we copy the existing one and get a
737                  * reference.
738                  */
739                 memcpy(pfid, tcon->crfid.fid, sizeof(*pfid));
740                 kref_get(&tcon->crfid.refcount);
741 
742                 mutex_unlock(&tcon->crfid.fid_mutex);
743 
744                 if (rc == 0) {
745                         /* close extra handle outside of crit sec */
746                         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
747                 }
748                 goto oshr_free;
749         }
750 
751         /* Cached root is still invalid, continue normaly */
752 
753         if (rc)
754                 goto oshr_exit;
755 
756         o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
757         oparms.fid->persistent_fid = o_rsp->PersistentFileId;
758         oparms.fid->volatile_fid = o_rsp->VolatileFileId;
759 #ifdef CONFIG_CIFS_DEBUG2
760         oparms.fid->mid = le64_to_cpu(o_rsp->sync_hdr.MessageId);
761 #endif /* CIFS_DEBUG2 */
762 
763         memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
764         tcon->crfid.tcon = tcon;
765         tcon->crfid.is_valid = true;
766         kref_init(&tcon->crfid.refcount);
767 
768         if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
769                 kref_get(&tcon->crfid.refcount);
770                 oplock = smb2_parse_lease_state(server, o_rsp,
771                                                 &oparms.fid->epoch,
772                                                 oparms.fid->lease_key);
773         } else
774                 goto oshr_exit;
775 
776         qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
777         if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
778                 goto oshr_exit;
779         if (!smb2_validate_and_copy_iov(
780                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
781                                 sizeof(struct smb2_file_all_info),
782                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
783                                 (char *)&tcon->crfid.file_all_info))
784                 tcon->crfid.file_all_info_is_valid = 1;
785 
786 oshr_exit:
787         mutex_unlock(&tcon->crfid.fid_mutex);
788 oshr_free:
789         SMB2_open_free(&rqst[0]);
790         SMB2_query_info_free(&rqst[1]);
791         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
792         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
793         return rc;
794 }
795 
796 static void
797 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
798 {
799         int rc;
800         __le16 srch_path = 0; /* Null - open root of share */
801         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
802         struct cifs_open_parms oparms;
803         struct cifs_fid fid;
804         bool no_cached_open = tcon->nohandlecache;
805 
806         oparms.tcon = tcon;
807         oparms.desired_access = FILE_READ_ATTRIBUTES;
808         oparms.disposition = FILE_OPEN;
809         oparms.create_options = 0;
810         oparms.fid = &fid;
811         oparms.reconnect = false;
812 
813         if (no_cached_open)
814                 rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
815                                NULL);
816         else
817                 rc = open_shroot(xid, tcon, &fid);
818 
819         if (rc)
820                 return;
821 
822         SMB3_request_interfaces(xid, tcon);
823 
824         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
825                         FS_ATTRIBUTE_INFORMATION);
826         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
827                         FS_DEVICE_INFORMATION);
828         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
829                         FS_VOLUME_INFORMATION);
830         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
831                         FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
832         if (no_cached_open)
833                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
834         else
835                 close_shroot(&tcon->crfid);
836 
837         return;
838 }
839 
840 static void
841 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
842 {
843         int rc;
844         __le16 srch_path = 0; /* Null - open root of share */
845         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
846         struct cifs_open_parms oparms;
847         struct cifs_fid fid;
848 
849         oparms.tcon = tcon;
850         oparms.desired_access = FILE_READ_ATTRIBUTES;
851         oparms.disposition = FILE_OPEN;
852         oparms.create_options = 0;
853         oparms.fid = &fid;
854         oparms.reconnect = false;
855 
856         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
857         if (rc)
858                 return;
859 
860         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
861                         FS_ATTRIBUTE_INFORMATION);
862         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
863                         FS_DEVICE_INFORMATION);
864         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
865         return;
866 }
867 
868 static int
869 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
870                         struct cifs_sb_info *cifs_sb, const char *full_path)
871 {
872         int rc;
873         __le16 *utf16_path;
874         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
875         struct cifs_open_parms oparms;
876         struct cifs_fid fid;
877 
878         if ((*full_path == 0) && tcon->crfid.is_valid)
879                 return 0;
880 
881         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
882         if (!utf16_path)
883                 return -ENOMEM;
884 
885         oparms.tcon = tcon;
886         oparms.desired_access = FILE_READ_ATTRIBUTES;
887         oparms.disposition = FILE_OPEN;
888         if (backup_cred(cifs_sb))
889                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
890         else
891                 oparms.create_options = 0;
892         oparms.fid = &fid;
893         oparms.reconnect = false;
894 
895         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
896         if (rc) {
897                 kfree(utf16_path);
898                 return rc;
899         }
900 
901         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
902         kfree(utf16_path);
903         return rc;
904 }
905 
906 static int
907 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
908                   struct cifs_sb_info *cifs_sb, const char *full_path,
909                   u64 *uniqueid, FILE_ALL_INFO *data)
910 {
911         *uniqueid = le64_to_cpu(data->IndexNumber);
912         return 0;
913 }
914 
915 static int
916 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
917                      struct cifs_fid *fid, FILE_ALL_INFO *data)
918 {
919         int rc;
920         struct smb2_file_all_info *smb2_data;
921 
922         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
923                             GFP_KERNEL);
924         if (smb2_data == NULL)
925                 return -ENOMEM;
926 
927         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
928                              smb2_data);
929         if (!rc)
930                 move_smb2_info_to_cifs(data, smb2_data);
931         kfree(smb2_data);
932         return rc;
933 }
934 
935 #ifdef CONFIG_CIFS_XATTR
936 static ssize_t
937 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
938                      struct smb2_file_full_ea_info *src, size_t src_size,
939                      const unsigned char *ea_name)
940 {
941         int rc = 0;
942         unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
943         char *name, *value;
944         size_t buf_size = dst_size;
945         size_t name_len, value_len, user_name_len;
946 
947         while (src_size > 0) {
948                 name = &src->ea_data[0];
949                 name_len = (size_t)src->ea_name_length;
950                 value = &src->ea_data[src->ea_name_length + 1];
951                 value_len = (size_t)le16_to_cpu(src->ea_value_length);
952 
953                 if (name_len == 0) {
954                         break;
955                 }
956 
957                 if (src_size < 8 + name_len + 1 + value_len) {
958                         cifs_dbg(FYI, "EA entry goes beyond length of list\n");
959                         rc = -EIO;
960                         goto out;
961                 }
962 
963                 if (ea_name) {
964                         if (ea_name_len == name_len &&
965                             memcmp(ea_name, name, name_len) == 0) {
966                                 rc = value_len;
967                                 if (dst_size == 0)
968                                         goto out;
969                                 if (dst_size < value_len) {
970                                         rc = -ERANGE;
971                                         goto out;
972                                 }
973                                 memcpy(dst, value, value_len);
974                                 goto out;
975                         }
976                 } else {
977                         /* 'user.' plus a terminating null */
978                         user_name_len = 5 + 1 + name_len;
979 
980                         if (buf_size == 0) {
981                                 /* skip copy - calc size only */
982                                 rc += user_name_len;
983                         } else if (dst_size >= user_name_len) {
984                                 dst_size -= user_name_len;
985                                 memcpy(dst, "user.", 5);
986                                 dst += 5;
987                                 memcpy(dst, src->ea_data, name_len);
988                                 dst += name_len;
989                                 *dst = 0;
990                                 ++dst;
991                                 rc += user_name_len;
992                         } else {
993                                 /* stop before overrun buffer */
994                                 rc = -ERANGE;
995                                 break;
996                         }
997                 }
998 
999                 if (!src->next_entry_offset)
1000                         break;
1001 
1002                 if (src_size < le32_to_cpu(src->next_entry_offset)) {
1003                         /* stop before overrun buffer */
1004                         rc = -ERANGE;
1005                         break;
1006                 }
1007                 src_size -= le32_to_cpu(src->next_entry_offset);
1008                 src = (void *)((char *)src +
1009                                le32_to_cpu(src->next_entry_offset));
1010         }
1011 
1012         /* didn't find the named attribute */
1013         if (ea_name)
1014                 rc = -ENODATA;
1015 
1016 out:
1017         return (ssize_t)rc;
1018 }
1019 
1020 static ssize_t
1021 smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
1022                const unsigned char *path, const unsigned char *ea_name,
1023                char *ea_data, size_t buf_size,
1024                struct cifs_sb_info *cifs_sb)
1025 {
1026         int rc;
1027         __le16 *utf16_path;
1028         struct kvec rsp_iov = {NULL, 0};
1029         int buftype = CIFS_NO_BUFFER;
1030         struct smb2_query_info_rsp *rsp;
1031         struct smb2_file_full_ea_info *info = NULL;
1032 
1033         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1034         if (!utf16_path)
1035                 return -ENOMEM;
1036 
1037         rc = smb2_query_info_compound(xid, tcon, utf16_path,
1038                                       FILE_READ_EA,
1039                                       FILE_FULL_EA_INFORMATION,
1040                                       SMB2_O_INFO_FILE,
1041                                       CIFSMaxBufSize -
1042                                       MAX_SMB2_CREATE_RESPONSE_SIZE -
1043                                       MAX_SMB2_CLOSE_RESPONSE_SIZE,
1044                                       &rsp_iov, &buftype, cifs_sb);
1045         if (rc) {
1046                 /*
1047                  * If ea_name is NULL (listxattr) and there are no EAs,
1048                  * return 0 as it's not an error. Otherwise, the specified
1049                  * ea_name was not found.
1050                  */
1051                 if (!ea_name && rc == -ENODATA)
1052                         rc = 0;
1053                 goto qeas_exit;
1054         }
1055 
1056         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
1057         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
1058                                le32_to_cpu(rsp->OutputBufferLength),
1059                                &rsp_iov,
1060                                sizeof(struct smb2_file_full_ea_info));
1061         if (rc)
1062                 goto qeas_exit;
1063 
1064         info = (struct smb2_file_full_ea_info *)(
1065                         le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
1066         rc = move_smb2_ea_to_cifs(ea_data, buf_size, info,
1067                         le32_to_cpu(rsp->OutputBufferLength), ea_name);
1068 
1069  qeas_exit:
1070         kfree(utf16_path);
1071         free_rsp_buf(buftype, rsp_iov.iov_base);
1072         return rc;
1073 }
1074 
1075 
1076 static int
1077 smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
1078             const char *path, const char *ea_name, const void *ea_value,
1079             const __u16 ea_value_len, const struct nls_table *nls_codepage,
1080             struct cifs_sb_info *cifs_sb)
1081 {
1082         struct cifs_ses *ses = tcon->ses;
1083         __le16 *utf16_path = NULL;
1084         int ea_name_len = strlen(ea_name);
1085         int flags = 0;
1086         int len;
1087         struct smb_rqst rqst[3];
1088         int resp_buftype[3];
1089         struct kvec rsp_iov[3];
1090         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1091         struct cifs_open_parms oparms;
1092         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1093         struct cifs_fid fid;
1094         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1095         unsigned int size[1];
1096         void *data[1];
1097         struct smb2_file_full_ea_info *ea = NULL;
1098         struct kvec close_iov[1];
1099         int rc;
1100 
1101         if (smb3_encryption_required(tcon))
1102                 flags |= CIFS_TRANSFORM_REQ;
1103 
1104         if (ea_name_len > 255)
1105                 return -EINVAL;
1106 
1107         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1108         if (!utf16_path)
1109                 return -ENOMEM;
1110 
1111         memset(rqst, 0, sizeof(rqst));
1112         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1113         memset(rsp_iov, 0, sizeof(rsp_iov));
1114 
1115         if (ses->server->ops->query_all_EAs) {
1116                 if (!ea_value) {
1117                         rc = ses->server->ops->query_all_EAs(xid, tcon, path,
1118                                                              ea_name, NULL, 0,
1119                                                              cifs_sb);
1120                         if (rc == -ENODATA)
1121                                 goto sea_exit;
1122                 }
1123         }
1124 
1125         /* Open */
1126         memset(&open_iov, 0, sizeof(open_iov));
1127         rqst[0].rq_iov = open_iov;
1128         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1129 
1130         memset(&oparms, 0, sizeof(oparms));
1131         oparms.tcon = tcon;
1132         oparms.desired_access = FILE_WRITE_EA;
1133         oparms.disposition = FILE_OPEN;
1134         if (backup_cred(cifs_sb))
1135                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1136         else
1137                 oparms.create_options = 0;
1138         oparms.fid = &fid;
1139         oparms.reconnect = false;
1140 
1141         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
1142         if (rc)
1143                 goto sea_exit;
1144         smb2_set_next_command(tcon, &rqst[0]);
1145 
1146 
1147         /* Set Info */
1148         memset(&si_iov, 0, sizeof(si_iov));
1149         rqst[1].rq_iov = si_iov;
1150         rqst[1].rq_nvec = 1;
1151 
1152         len = sizeof(ea) + ea_name_len + ea_value_len + 1;
1153         ea = kzalloc(len, GFP_KERNEL);
1154         if (ea == NULL) {
1155                 rc = -ENOMEM;
1156                 goto sea_exit;
1157         }
1158 
1159         ea->ea_name_length = ea_name_len;
1160         ea->ea_value_length = cpu_to_le16(ea_value_len);
1161         memcpy(ea->ea_data, ea_name, ea_name_len + 1);
1162         memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
1163 
1164         size[0] = len;
1165         data[0] = ea;
1166 
1167         rc = SMB2_set_info_init(tcon, &rqst[1], COMPOUND_FID,
1168                                 COMPOUND_FID, current->tgid,
1169                                 FILE_FULL_EA_INFORMATION,
1170                                 SMB2_O_INFO_FILE, 0, data, size);
1171         smb2_set_next_command(tcon, &rqst[1]);
1172         smb2_set_related(&rqst[1]);
1173 
1174 
1175         /* Close */
1176         memset(&close_iov, 0, sizeof(close_iov));
1177         rqst[2].rq_iov = close_iov;
1178         rqst[2].rq_nvec = 1;
1179         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
1180         smb2_set_related(&rqst[2]);
1181 
1182         rc = compound_send_recv(xid, ses, flags, 3, rqst,
1183                                 resp_buftype, rsp_iov);
1184 
1185  sea_exit:
1186         kfree(ea);
1187         kfree(utf16_path);
1188         SMB2_open_free(&rqst[0]);
1189         SMB2_set_info_free(&rqst[1]);
1190         SMB2_close_free(&rqst[2]);
1191         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1192         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1193         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1194         return rc;
1195 }
1196 #endif
1197 
1198 static bool
1199 smb2_can_echo(struct TCP_Server_Info *server)
1200 {
1201         return server->echoes;
1202 }
1203 
1204 static void
1205 smb2_clear_stats(struct cifs_tcon *tcon)
1206 {
1207         int i;
1208         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
1209                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
1210                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
1211         }
1212 }
1213 
1214 static void
1215 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
1216 {
1217         seq_puts(m, "\n\tShare Capabilities:");
1218         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
1219                 seq_puts(m, " DFS,");
1220         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
1221                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
1222         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
1223                 seq_puts(m, " SCALEOUT,");
1224         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
1225                 seq_puts(m, " CLUSTER,");
1226         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
1227                 seq_puts(m, " ASYMMETRIC,");
1228         if (tcon->capabilities == 0)
1229                 seq_puts(m, " None");
1230         if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
1231                 seq_puts(m, " Aligned,");
1232         if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
1233                 seq_puts(m, " Partition Aligned,");
1234         if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
1235                 seq_puts(m, " SSD,");
1236         if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
1237                 seq_puts(m, " TRIM-support,");
1238 
1239         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
1240         seq_printf(m, "\n\ttid: 0x%x", tcon->tid);
1241         if (tcon->perf_sector_size)
1242                 seq_printf(m, "\tOptimal sector size: 0x%x",
1243                            tcon->perf_sector_size);
1244         seq_printf(m, "\tMaximal Access: 0x%x", tcon->maximal_access);
1245 }
1246 
1247 static void
1248 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
1249 {
1250         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
1251         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
1252 
1253         /*
1254          *  Can't display SMB2_NEGOTIATE, SESSION_SETUP, LOGOFF, CANCEL and ECHO
1255          *  totals (requests sent) since those SMBs are per-session not per tcon
1256          */
1257         seq_printf(m, "\nBytes read: %llu  Bytes written: %llu",
1258                    (long long)(tcon->bytes_read),
1259                    (long long)(tcon->bytes_written));
1260         seq_printf(m, "\nOpen files: %d total (local), %d open on server",
1261                    atomic_read(&tcon->num_local_opens),
1262                    atomic_read(&tcon->num_remote_opens));
1263         seq_printf(m, "\nTreeConnects: %d total %d failed",
1264                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
1265                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
1266         seq_printf(m, "\nTreeDisconnects: %d total %d failed",
1267                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
1268                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
1269         seq_printf(m, "\nCreates: %d total %d failed",
1270                    atomic_read(&sent[SMB2_CREATE_HE]),
1271                    atomic_read(&failed[SMB2_CREATE_HE]));
1272         seq_printf(m, "\nCloses: %d total %d failed",
1273                    atomic_read(&sent[SMB2_CLOSE_HE]),
1274                    atomic_read(&failed[SMB2_CLOSE_HE]));
1275         seq_printf(m, "\nFlushes: %d total %d failed",
1276                    atomic_read(&sent[SMB2_FLUSH_HE]),
1277                    atomic_read(&failed[SMB2_FLUSH_HE]));
1278         seq_printf(m, "\nReads: %d total %d failed",
1279                    atomic_read(&sent[SMB2_READ_HE]),
1280                    atomic_read(&failed[SMB2_READ_HE]));
1281         seq_printf(m, "\nWrites: %d total %d failed",
1282                    atomic_read(&sent[SMB2_WRITE_HE]),
1283                    atomic_read(&failed[SMB2_WRITE_HE]));
1284         seq_printf(m, "\nLocks: %d total %d failed",
1285                    atomic_read(&sent[SMB2_LOCK_HE]),
1286                    atomic_read(&failed[SMB2_LOCK_HE]));
1287         seq_printf(m, "\nIOCTLs: %d total %d failed",
1288                    atomic_read(&sent[SMB2_IOCTL_HE]),
1289                    atomic_read(&failed[SMB2_IOCTL_HE]));
1290         seq_printf(m, "\nQueryDirectories: %d total %d failed",
1291                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
1292                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
1293         seq_printf(m, "\nChangeNotifies: %d total %d failed",
1294                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
1295                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
1296         seq_printf(m, "\nQueryInfos: %d total %d failed",
1297                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
1298                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
1299         seq_printf(m, "\nSetInfos: %d total %d failed",
1300                    atomic_read(&sent[SMB2_SET_INFO_HE]),
1301                    atomic_read(&failed[SMB2_SET_INFO_HE]));
1302         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
1303                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
1304                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
1305 }
1306 
1307 static void
1308 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
1309 {
1310         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
1311         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
1312 
1313         cfile->fid.persistent_fid = fid->persistent_fid;
1314         cfile->fid.volatile_fid = fid->volatile_fid;
1315 #ifdef CONFIG_CIFS_DEBUG2
1316         cfile->fid.mid = fid->mid;
1317 #endif /* CIFS_DEBUG2 */
1318         server->ops->set_oplock_level(cinode, oplock, fid->epoch,
1319                                       &fid->purge_cache);
1320         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
1321         memcpy(cfile->fid.create_guid, fid->create_guid, 16);
1322 }
1323 
1324 static void
1325 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
1326                 struct cifs_fid *fid)
1327 {
1328         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1329 }
1330 
1331 static int
1332 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
1333                      u64 persistent_fid, u64 volatile_fid,
1334                      struct copychunk_ioctl *pcchunk)
1335 {
1336         int rc;
1337         unsigned int ret_data_len;
1338         struct resume_key_req *res_key;
1339 
1340         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1341                         FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
1342                         NULL, 0 /* no input */, CIFSMaxBufSize,
1343                         (char **)&res_key, &ret_data_len);
1344 
1345         if (rc) {
1346                 cifs_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
1347                 goto req_res_key_exit;
1348         }
1349         if (ret_data_len < sizeof(struct resume_key_req)) {
1350                 cifs_dbg(VFS, "Invalid refcopy resume key length\n");
1351                 rc = -EINVAL;
1352                 goto req_res_key_exit;
1353         }
1354         memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
1355 
1356 req_res_key_exit:
1357         kfree(res_key);
1358         return rc;
1359 }
1360 
1361 static int
1362 smb2_ioctl_query_info(const unsigned int xid,
1363                       struct cifs_tcon *tcon,
1364                       __le16 *path, int is_dir,
1365                       unsigned long p)
1366 {
1367         struct cifs_ses *ses = tcon->ses;
1368         char __user *arg = (char __user *)p;
1369         struct smb_query_info qi;
1370         struct smb_query_info __user *pqi;
1371         int rc = 0;
1372         int flags = 0;
1373         struct smb2_query_info_rsp *qi_rsp = NULL;
1374         struct smb2_ioctl_rsp *io_rsp = NULL;
1375         void *buffer = NULL;
1376         struct smb_rqst rqst[3];
1377         int resp_buftype[3];
1378         struct kvec rsp_iov[3];
1379         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1380         struct cifs_open_parms oparms;
1381         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1382         struct cifs_fid fid;
1383         struct kvec qi_iov[1];
1384         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
1385         struct kvec close_iov[1];
1386 
1387         memset(rqst, 0, sizeof(rqst));
1388         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1389         memset(rsp_iov, 0, sizeof(rsp_iov));
1390 
1391         if (copy_from_user(&qi, arg, sizeof(struct smb_query_info)))
1392                 return -EFAULT;
1393 
1394         if (qi.output_buffer_length > 1024)
1395                 return -EINVAL;
1396 
1397         if (!ses || !(ses->server))
1398                 return -EIO;
1399 
1400         if (smb3_encryption_required(tcon))
1401                 flags |= CIFS_TRANSFORM_REQ;
1402 
1403         buffer = kmalloc(qi.output_buffer_length, GFP_KERNEL);
1404         if (buffer == NULL)
1405                 return -ENOMEM;
1406 
1407         if (copy_from_user(buffer, arg + sizeof(struct smb_query_info),
1408                            qi.output_buffer_length)) {
1409                 rc = -EFAULT;
1410                 goto iqinf_exit;
1411         }
1412 
1413         /* Open */
1414         memset(&open_iov, 0, sizeof(open_iov));
1415         rqst[0].rq_iov = open_iov;
1416         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1417 
1418         memset(&oparms, 0, sizeof(oparms));
1419         oparms.tcon = tcon;
1420         oparms.desired_access = FILE_READ_ATTRIBUTES | READ_CONTROL;
1421         oparms.disposition = FILE_OPEN;
1422         if (is_dir)
1423                 oparms.create_options = CREATE_NOT_FILE;
1424         else
1425                 oparms.create_options = CREATE_NOT_DIR;
1426         oparms.fid = &fid;
1427         oparms.reconnect = false;
1428 
1429         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, path);
1430         if (rc)
1431                 goto iqinf_exit;
1432         smb2_set_next_command(tcon, &rqst[0]);
1433 
1434         /* Query */
1435         if (qi.flags & PASSTHRU_FSCTL) {
1436                 /* Can eventually relax perm check since server enforces too */
1437                 if (!capable(CAP_SYS_ADMIN))
1438                         rc = -EPERM;
1439                 else  {
1440                         memset(&io_iov, 0, sizeof(io_iov));
1441                         rqst[1].rq_iov = io_iov;
1442                         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
1443 
1444                         rc = SMB2_ioctl_init(tcon, &rqst[1],
1445                                              COMPOUND_FID, COMPOUND_FID,
1446                                              qi.info_type, true, NULL,
1447                                              0, CIFSMaxBufSize);
1448                 }
1449         } else if (qi.flags == PASSTHRU_QUERY_INFO) {
1450                 memset(&qi_iov, 0, sizeof(qi_iov));
1451                 rqst[1].rq_iov = qi_iov;
1452                 rqst[1].rq_nvec = 1;
1453 
1454                 rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
1455                                   COMPOUND_FID, qi.file_info_class,
1456                                   qi.info_type, qi.additional_information,
1457                                   qi.input_buffer_length,
1458                                   qi.output_buffer_length, buffer);
1459         } else { /* unknown flags */
1460                 cifs_dbg(VFS, "invalid passthru query flags: 0x%x\n", qi.flags);
1461                 rc = -EINVAL;
1462         }
1463 
1464         if (rc)
1465                 goto iqinf_exit;
1466         smb2_set_next_command(tcon, &rqst[1]);
1467         smb2_set_related(&rqst[1]);
1468 
1469         /* Close */
1470         memset(&close_iov, 0, sizeof(close_iov));
1471         rqst[2].rq_iov = close_iov;
1472         rqst[2].rq_nvec = 1;
1473 
1474         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
1475         if (rc)
1476                 goto iqinf_exit;
1477         smb2_set_related(&rqst[2]);
1478 
1479         rc = compound_send_recv(xid, ses, flags, 3, rqst,
1480                                 resp_buftype, rsp_iov);
1481         if (rc)
1482                 goto iqinf_exit;
1483         if (qi.flags & PASSTHRU_FSCTL) {
1484                 pqi = (struct smb_query_info __user *)arg;
1485                 io_rsp = (struct smb2_ioctl_rsp *)rsp_iov[1].iov_base;
1486                 if (le32_to_cpu(io_rsp->OutputCount) < qi.input_buffer_length)
1487                         qi.input_buffer_length = le32_to_cpu(io_rsp->OutputCount);
1488                 if (copy_to_user(&pqi->input_buffer_length, &qi.input_buffer_length,
1489                                  sizeof(qi.input_buffer_length))) {
1490                         rc = -EFAULT;
1491                         goto iqinf_exit;
1492                 }
1493                 if (copy_to_user(pqi + 1, &io_rsp[1], qi.input_buffer_length)) {
1494                         rc = -EFAULT;
1495                         goto iqinf_exit;
1496                 }
1497         } else {
1498                 pqi = (struct smb_query_info __user *)arg;
1499                 qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
1500                 if (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length)
1501                         qi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength);
1502                 if (copy_to_user(&pqi->input_buffer_length, &qi.input_buffer_length,
1503                                  sizeof(qi.input_buffer_length))) {
1504                         rc = -EFAULT;
1505                         goto iqinf_exit;
1506                 }
1507                 if (copy_to_user(pqi + 1, qi_rsp->Buffer, qi.input_buffer_length)) {
1508                         rc = -EFAULT;
1509                         goto iqinf_exit;
1510                 }
1511         }
1512 
1513  iqinf_exit:
1514         kfree(buffer);
1515         SMB2_open_free(&rqst[0]);
1516         if (qi.flags & PASSTHRU_FSCTL)
1517                 SMB2_ioctl_free(&rqst[1]);
1518         else
1519                 SMB2_query_info_free(&rqst[1]);
1520 
1521         SMB2_close_free(&rqst[2]);
1522         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1523         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1524         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1525         return rc;
1526 }
1527 
1528 static ssize_t
1529 smb2_copychunk_range(const unsigned int xid,
1530                         struct cifsFileInfo *srcfile,
1531                         struct cifsFileInfo *trgtfile, u64 src_off,
1532                         u64 len, u64 dest_off)
1533 {
1534         int rc;
1535         unsigned int ret_data_len;
1536         struct copychunk_ioctl *pcchunk;
1537         struct copychunk_ioctl_rsp *retbuf = NULL;
1538         struct cifs_tcon *tcon;
1539         int chunks_copied = 0;
1540         bool chunk_sizes_updated = false;
1541         ssize_t bytes_written, total_bytes_written = 0;
1542 
1543         pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
1544 
1545         if (pcchunk == NULL)
1546                 return -ENOMEM;
1547 
1548         cifs_dbg(FYI, "in smb2_copychunk_range - about to call request res key\n");
1549         /* Request a key from the server to identify the source of the copy */
1550         rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
1551                                 srcfile->fid.persistent_fid,
1552                                 srcfile->fid.volatile_fid, pcchunk);
1553 
1554         /* Note: request_res_key sets res_key null only if rc !=0 */
1555         if (rc)
1556                 goto cchunk_out;
1557 
1558         /* For now array only one chunk long, will make more flexible later */
1559         pcchunk->ChunkCount = cpu_to_le32(1);
1560         pcchunk->Reserved = 0;
1561         pcchunk->Reserved2 = 0;
1562 
1563         tcon = tlink_tcon(trgtfile->tlink);
1564 
1565         while (len > 0) {
1566                 pcchunk->SourceOffset = cpu_to_le64(src_off);
1567                 pcchunk->TargetOffset = cpu_to_le64(dest_off);
1568                 pcchunk->Length =
1569                         cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
1570 
1571                 /* Request server copy to target from src identified by key */
1572                 rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1573                         trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
1574                         true /* is_fsctl */, (char *)pcchunk,
1575                         sizeof(struct copychunk_ioctl), CIFSMaxBufSize,
1576                         (char **)&retbuf, &ret_data_len);
1577                 if (rc == 0) {
1578                         if (ret_data_len !=
1579                                         sizeof(struct copychunk_ioctl_rsp)) {
1580                                 cifs_dbg(VFS, "invalid cchunk response size\n");
1581                                 rc = -EIO;
1582                                 goto cchunk_out;
1583                         }
1584                         if (retbuf->TotalBytesWritten == 0) {
1585                                 cifs_dbg(FYI, "no bytes copied\n");
1586                                 rc = -EIO;
1587                                 goto cchunk_out;
1588                         }
1589                         /*
1590                          * Check if server claimed to write more than we asked
1591                          */
1592                         if (le32_to_cpu(retbuf->TotalBytesWritten) >
1593                             le32_to_cpu(pcchunk->Length)) {
1594                                 cifs_dbg(VFS, "invalid copy chunk response\n");
1595                                 rc = -EIO;
1596                                 goto cchunk_out;
1597                         }
1598                         if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
1599                                 cifs_dbg(VFS, "invalid num chunks written\n");
1600                                 rc = -EIO;
1601                                 goto cchunk_out;
1602                         }
1603                         chunks_copied++;
1604 
1605                         bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
1606                         src_off += bytes_written;
1607                         dest_off += bytes_written;
1608                         len -= bytes_written;
1609                         total_bytes_written += bytes_written;
1610 
1611                         cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
1612                                 le32_to_cpu(retbuf->ChunksWritten),
1613                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1614                                 bytes_written);
1615                 } else if (rc == -EINVAL) {
1616                         if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
1617                                 goto cchunk_out;
1618 
1619                         cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
1620                                 le32_to_cpu(retbuf->ChunksWritten),
1621                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1622                                 le32_to_cpu(retbuf->TotalBytesWritten));
1623 
1624                         /*
1625                          * Check if this is the first request using these sizes,
1626                          * (ie check if copy succeed once with original sizes
1627                          * and check if the server gave us different sizes after
1628                          * we already updated max sizes on previous request).
1629                          * if not then why is the server returning an error now
1630                          */
1631                         if ((chunks_copied != 0) || chunk_sizes_updated)
1632                                 goto cchunk_out;
1633 
1634                         /* Check that server is not asking us to grow size */
1635                         if (le32_to_cpu(retbuf->ChunkBytesWritten) <
1636                                         tcon->max_bytes_chunk)
1637                                 tcon->max_bytes_chunk =
1638                                         le32_to_cpu(retbuf->ChunkBytesWritten);
1639                         else
1640                                 goto cchunk_out; /* server gave us bogus size */
1641 
1642                         /* No need to change MaxChunks since already set to 1 */
1643                         chunk_sizes_updated = true;
1644                 } else
1645                         goto cchunk_out;
1646         }
1647 
1648 cchunk_out:
1649         kfree(pcchunk);
1650         kfree(retbuf);
1651         if (rc)
1652                 return rc;
1653         else
1654                 return total_bytes_written;
1655 }
1656 
1657 static int
1658 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
1659                 struct cifs_fid *fid)
1660 {
1661         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1662 }
1663 
1664 static unsigned int
1665 smb2_read_data_offset(char *buf)
1666 {
1667         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1668         return rsp->DataOffset;
1669 }
1670 
1671 static unsigned int
1672 smb2_read_data_length(char *buf, bool in_remaining)
1673 {
1674         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1675 
1676         if (in_remaining)
1677                 return le32_to_cpu(rsp->DataRemaining);
1678 
1679         return le32_to_cpu(rsp->DataLength);
1680 }
1681 
1682 
1683 static int
1684 smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
1685                struct cifs_io_parms *parms, unsigned int *bytes_read,
1686                char **buf, int *buf_type)
1687 {
1688         parms->persistent_fid = pfid->persistent_fid;
1689         parms->volatile_fid = pfid->volatile_fid;
1690         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
1691 }
1692 
1693 static int
1694 smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
1695                 struct cifs_io_parms *parms, unsigned int *written,
1696                 struct kvec *iov, unsigned long nr_segs)
1697 {
1698 
1699         parms->persistent_fid = pfid->persistent_fid;
1700         parms->volatile_fid = pfid->volatile_fid;
1701         return SMB2_write(xid, parms, written, iov, nr_segs);
1702 }
1703 
1704 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
1705 static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
1706                 struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
1707 {
1708         struct cifsInodeInfo *cifsi;
1709         int rc;
1710 
1711         cifsi = CIFS_I(inode);
1712 
1713         /* if file already sparse don't bother setting sparse again */
1714         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
1715                 return true; /* already sparse */
1716 
1717         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
1718                 return true; /* already not sparse */
1719 
1720         /*
1721          * Can't check for sparse support on share the usual way via the
1722          * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
1723          * since Samba server doesn't set the flag on the share, yet
1724          * supports the set sparse FSCTL and returns sparse correctly
1725          * in the file attributes. If we fail setting sparse though we
1726          * mark that server does not support sparse files for this share
1727          * to avoid repeatedly sending the unsupported fsctl to server
1728          * if the file is repeatedly extended.
1729          */
1730         if (tcon->broken_sparse_sup)
1731                 return false;
1732 
1733         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1734                         cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
1735                         true /* is_fctl */,
1736                         &setsparse, 1, CIFSMaxBufSize, NULL, NULL);
1737         if (rc) {
1738                 tcon->broken_sparse_sup = true;
1739                 cifs_dbg(FYI, "set sparse rc = %d\n", rc);
1740                 return false;
1741         }
1742 
1743         if (setsparse)
1744                 cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
1745         else
1746                 cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
1747 
1748         return true;
1749 }
1750 
1751 static int
1752 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
1753                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
1754 {
1755         __le64 eof = cpu_to_le64(size);
1756         struct inode *inode;
1757 
1758         /*
1759          * If extending file more than one page make sparse. Many Linux fs
1760          * make files sparse by default when extending via ftruncate
1761          */
1762         inode = d_inode(cfile->dentry);
1763 
1764         if (!set_alloc && (size > inode->i_size + 8192)) {
1765                 __u8 set_sparse = 1;
1766 
1767                 /* whether set sparse succeeds or not, extend the file */
1768                 smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
1769         }
1770 
1771         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
1772                             cfile->fid.volatile_fid, cfile->pid, &eof);
1773 }
1774 
1775 static int
1776 smb2_duplicate_extents(const unsigned int xid,
1777                         struct cifsFileInfo *srcfile,
1778                         struct cifsFileInfo *trgtfile, u64 src_off,
1779                         u64 len, u64 dest_off)
1780 {
1781         int rc;
1782         unsigned int ret_data_len;
1783         struct duplicate_extents_to_file dup_ext_buf;
1784         struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
1785 
1786         /* server fileays advertise duplicate extent support with this flag */
1787         if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
1788              FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
1789                 return -EOPNOTSUPP;
1790 
1791         dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
1792         dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
1793         dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
1794         dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
1795         dup_ext_buf.ByteCount = cpu_to_le64(len);
1796         cifs_dbg(FYI, "duplicate extents: src off %lld dst off %lld len %lld",
1797                 src_off, dest_off, len);
1798 
1799         rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
1800         if (rc)
1801                 goto duplicate_extents_out;
1802 
1803         rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1804                         trgtfile->fid.volatile_fid,
1805                         FSCTL_DUPLICATE_EXTENTS_TO_FILE,
1806                         true /* is_fsctl */,
1807                         (char *)&dup_ext_buf,
1808                         sizeof(struct duplicate_extents_to_file),
1809                         CIFSMaxBufSize, NULL,
1810                         &ret_data_len);
1811 
1812         if (ret_data_len > 0)
1813                 cifs_dbg(FYI, "non-zero response length in duplicate extents");
1814 
1815 duplicate_extents_out:
1816         return rc;
1817 }
1818 
1819 static int
1820 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1821                    struct cifsFileInfo *cfile)
1822 {
1823         return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
1824                             cfile->fid.volatile_fid);
1825 }
1826 
1827 static int
1828 smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
1829                    struct cifsFileInfo *cfile)
1830 {
1831         struct fsctl_set_integrity_information_req integr_info;
1832         unsigned int ret_data_len;
1833 
1834         integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
1835         integr_info.Flags = 0;
1836         integr_info.Reserved = 0;
1837 
1838         return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1839                         cfile->fid.volatile_fid,
1840                         FSCTL_SET_INTEGRITY_INFORMATION,
1841                         true /* is_fsctl */,
1842                         (char *)&integr_info,
1843                         sizeof(struct fsctl_set_integrity_information_req),
1844                         CIFSMaxBufSize, NULL,
1845                         &ret_data_len);
1846 
1847 }
1848 
1849 /* GMT Token is @GMT-YYYY.MM.DD-HH.MM.SS Unicode which is 48 bytes + null */
1850 #define GMT_TOKEN_SIZE 50
1851 
1852 #define MIN_SNAPSHOT_ARRAY_SIZE 16 /* See MS-SMB2 section 3.3.5.15.1 */
1853 
1854 /*
1855  * Input buffer contains (empty) struct smb_snapshot array with size filled in
1856  * For output see struct SRV_SNAPSHOT_ARRAY in MS-SMB2 section 2.2.32.2
1857  */
1858 static int
1859 smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
1860                    struct cifsFileInfo *cfile, void __user *ioc_buf)
1861 {
1862         char *retbuf = NULL;
1863         unsigned int ret_data_len = 0;
1864         int rc;
1865         u32 max_response_size;
1866         struct smb_snapshot_array snapshot_in;
1867 
1868         if (get_user(ret_data_len, (unsigned int __user *)ioc_buf))
1869                 return -EFAULT;
1870 
1871         /*
1872          * Note that for snapshot queries that servers like Azure expect that
1873          * the first query be minimal size (and just used to get the number/size
1874          * of previous versions) so response size must be specified as EXACTLY
1875          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
1876          * of eight bytes.
1877          */
1878         if (ret_data_len == 0)
1879                 max_response_size = MIN_SNAPSHOT_ARRAY_SIZE;
1880         else
1881                 max_response_size = CIFSMaxBufSize;
1882 
1883         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1884                         cfile->fid.volatile_fid,
1885                         FSCTL_SRV_ENUMERATE_SNAPSHOTS,
1886                         true /* is_fsctl */,
1887                         NULL, 0 /* no input data */, max_response_size,
1888                         (char **)&retbuf,
1889                         &ret_data_len);
1890         cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
1891                         rc, ret_data_len);
1892         if (rc)
1893                 return rc;
1894 
1895         if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
1896                 /* Fixup buffer */
1897                 if (copy_from_user(&snapshot_in, ioc_buf,
1898                     sizeof(struct smb_snapshot_array))) {
1899                         rc = -EFAULT;
1900                         kfree(retbuf);
1901                         return rc;
1902                 }
1903 
1904                 /*
1905                  * Check for min size, ie not large enough to fit even one GMT
1906                  * token (snapshot).  On the first ioctl some users may pass in
1907                  * smaller size (or zero) to simply get the size of the array
1908                  * so the user space caller can allocate sufficient memory
1909                  * and retry the ioctl again with larger array size sufficient
1910                  * to hold all of the snapshot GMT tokens on the second try.
1911                  */
1912                 if (snapshot_in.snapshot_array_size < GMT_TOKEN_SIZE)
1913                         ret_data_len = sizeof(struct smb_snapshot_array);
1914 
1915                 /*
1916                  * We return struct SRV_SNAPSHOT_ARRAY, followed by
1917                  * the snapshot array (of 50 byte GMT tokens) each
1918                  * representing an available previous version of the data
1919                  */
1920                 if (ret_data_len > (snapshot_in.snapshot_array_size +
1921                                         sizeof(struct smb_snapshot_array)))
1922                         ret_data_len = snapshot_in.snapshot_array_size +
1923                                         sizeof(struct smb_snapshot_array);
1924 
1925                 if (copy_to_user(ioc_buf, retbuf, ret_data_len))
1926                         rc = -EFAULT;
1927         }
1928 
1929         kfree(retbuf);
1930         return rc;
1931 }
1932 
1933 static int
1934 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
1935                      const char *path, struct cifs_sb_info *cifs_sb,
1936                      struct cifs_fid *fid, __u16 search_flags,
1937                      struct cifs_search_info *srch_inf)
1938 {
1939         __le16 *utf16_path;
1940         int rc;
1941         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1942         struct cifs_open_parms oparms;
1943 
1944         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1945         if (!utf16_path)
1946                 return -ENOMEM;
1947 
1948         oparms.tcon = tcon;
1949         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
1950         oparms.disposition = FILE_OPEN;
1951         if (backup_cred(cifs_sb))
1952                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1953         else
1954                 oparms.create_options = 0;
1955         oparms.fid = fid;
1956         oparms.reconnect = false;
1957 
1958         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
1959         kfree(utf16_path);
1960         if (rc) {
1961                 cifs_dbg(FYI, "open dir failed rc=%d\n", rc);
1962                 return rc;
1963         }
1964 
1965         srch_inf->entries_in_buffer = 0;
1966         srch_inf->index_of_last_entry = 2;
1967 
1968         rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
1969                                   fid->volatile_fid, 0, srch_inf);
1970         if (rc) {
1971                 cifs_dbg(FYI, "query directory failed rc=%d\n", rc);
1972                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1973         }
1974         return rc;
1975 }
1976 
1977 static int
1978 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
1979                     struct cifs_fid *fid, __u16 search_flags,
1980                     struct cifs_search_info *srch_inf)
1981 {
1982         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
1983                                     fid->volatile_fid, 0, srch_inf);
1984 }
1985 
1986 static int
1987 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
1988                struct cifs_fid *fid)
1989 {
1990         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1991 }
1992 
1993 /*
1994 * If we negotiate SMB2 protocol and get STATUS_PENDING - update
1995 * the number of credits and return true. Otherwise - return false.
1996 */
1997 static bool
1998 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server)
1999 {
2000         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
2001 
2002         if (shdr->Status != STATUS_PENDING)
2003                 return false;
2004 
2005         if (shdr->CreditRequest) {
2006                 spin_lock(&server->req_lock);
2007                 server->credits += le16_to_cpu(shdr->CreditRequest);
2008                 spin_unlock(&server->req_lock);
2009                 wake_up(&server->request_q);
2010         }
2011 
2012         return true;
2013 }
2014 
2015 static bool
2016 smb2_is_session_expired(char *buf)
2017 {
2018         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
2019 
2020         if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED &&
2021             shdr->Status != STATUS_USER_SESSION_DELETED)
2022                 return false;
2023 
2024         trace_smb3_ses_expired(shdr->TreeId, shdr->SessionId,
2025                                le16_to_cpu(shdr->Command),
2026                                le64_to_cpu(shdr->MessageId));
2027         cifs_dbg(FYI, "Session expired or deleted\n");
2028 
2029         return true;
2030 }
2031 
2032 static int
2033 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
2034                      struct cifsInodeInfo *cinode)
2035 {
2036         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
2037                 return SMB2_lease_break(0, tcon, cinode->lease_key,
2038                                         smb2_get_lease_state(cinode));
2039 
2040         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
2041                                  fid->volatile_fid,
2042                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
2043 }
2044 
2045 void
2046 smb2_set_related(struct smb_rqst *rqst)
2047 {
2048         struct smb2_sync_hdr *shdr;
2049 
2050         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
2051         if (shdr == NULL) {
2052                 cifs_dbg(FYI, "shdr NULL in smb2_set_related\n");
2053                 return;
2054         }
2055         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2056 }
2057 
2058 char smb2_padding[7] = {0, 0, 0, 0, 0, 0, 0};
2059 
2060 void
2061 smb2_set_next_command(struct cifs_tcon *tcon, struct smb_rqst *rqst)
2062 {
2063         struct smb2_sync_hdr *shdr;
2064         struct cifs_ses *ses = tcon->ses;
2065         struct TCP_Server_Info *server = ses->server;
2066         unsigned long len = smb_rqst_len(server, rqst);
2067         int i, num_padding;
2068 
2069         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
2070         if (shdr == NULL) {
2071                 cifs_dbg(FYI, "shdr NULL in smb2_set_next_command\n");
2072                 return;
2073         }
2074 
2075         /* SMB headers in a compound are 8 byte aligned. */
2076 
2077         /* No padding needed */
2078         if (!(len & 7))
2079                 goto finished;
2080 
2081         num_padding = 8 - (len & 7);
2082         if (!smb3_encryption_required(tcon)) {
2083                 /*
2084                  * If we do not have encryption then we can just add an extra
2085                  * iov for the padding.
2086                  */
2087                 rqst->rq_iov[rqst->rq_nvec].iov_base = smb2_padding;
2088                 rqst->rq_iov[rqst->rq_nvec].iov_len = num_padding;
2089                 rqst->rq_nvec++;
2090                 len += num_padding;
2091         } else {
2092                 /*
2093                  * We can not add a small padding iov for the encryption case
2094                  * because the encryption framework can not handle the padding
2095                  * iovs.
2096                  * We have to flatten this into a single buffer and add
2097                  * the padding to it.
2098                  */
2099                 for (i = 1; i < rqst->rq_nvec; i++) {
2100                         memcpy(rqst->rq_iov[0].iov_base +
2101                                rqst->rq_iov[0].iov_len,
2102                                rqst->rq_iov[i].iov_base,
2103                                rqst->rq_iov[i].iov_len);
2104                         rqst->rq_iov[0].iov_len += rqst->rq_iov[i].iov_len;
2105                 }
2106                 memset(rqst->rq_iov[0].iov_base + rqst->rq_iov[0].iov_len,
2107                        0, num_padding);
2108                 rqst->rq_iov[0].iov_len += num_padding;
2109                 len += num_padding;
2110                 rqst->rq_nvec = 1;
2111         }
2112 
2113  finished:
2114         shdr->NextCommand = cpu_to_le32(len);
2115 }
2116 
2117 /*
2118  * Passes the query info response back to the caller on success.
2119  * Caller need to free this with free_rsp_buf().
2120  */
2121 int
2122 smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
2123                          __le16 *utf16_path, u32 desired_access,
2124                          u32 class, u32 type, u32 output_len,
2125                          struct kvec *rsp, int *buftype,
2126                          struct cifs_sb_info *cifs_sb)
2127 {
2128         struct cifs_ses *ses = tcon->ses;
2129         int flags = 0;
2130         struct smb_rqst rqst[3];
2131         int resp_buftype[3];
2132         struct kvec rsp_iov[3];
2133         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2134         struct kvec qi_iov[1];
2135         struct kvec close_iov[1];
2136         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2137         struct cifs_open_parms oparms;
2138         struct cifs_fid fid;
2139         int rc;
2140 
2141         if (smb3_encryption_required(tcon))
2142                 flags |= CIFS_TRANSFORM_REQ;
2143 
2144         memset(rqst, 0, sizeof(rqst));
2145         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2146         memset(rsp_iov, 0, sizeof(rsp_iov));
2147 
2148         memset(&open_iov, 0, sizeof(open_iov));
2149         rqst[0].rq_iov = open_iov;
2150         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2151 
2152         oparms.tcon = tcon;
2153         oparms.desired_access = desired_access;
2154         oparms.disposition = FILE_OPEN;
2155         if (cifs_sb && backup_cred(cifs_sb))
2156                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2157         else
2158                 oparms.create_options = 0;
2159         oparms.fid = &fid;
2160         oparms.reconnect = false;
2161 
2162         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
2163         if (rc)
2164                 goto qic_exit;
2165         smb2_set_next_command(tcon, &rqst[0]);
2166 
2167         memset(&qi_iov, 0, sizeof(qi_iov));
2168         rqst[1].rq_iov = qi_iov;
2169         rqst[1].rq_nvec = 1;
2170 
2171         rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID, COMPOUND_FID,
2172                                   class, type, 0,
2173                                   output_len, 0,
2174                                   NULL);
2175         if (rc)
2176                 goto qic_exit;
2177         smb2_set_next_command(tcon, &rqst[1]);
2178         smb2_set_related(&rqst[1]);
2179 
2180         memset(&close_iov, 0, sizeof(close_iov));
2181         rqst[2].rq_iov = close_iov;
2182         rqst[2].rq_nvec = 1;
2183 
2184         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
2185         if (rc)
2186                 goto qic_exit;
2187         smb2_set_related(&rqst[2]);
2188 
2189         rc = compound_send_recv(xid, ses, flags, 3, rqst,
2190                                 resp_buftype, rsp_iov);
2191         if (rc) {
2192                 free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2193                 goto qic_exit;
2194         }
2195         *rsp = rsp_iov[1];
2196         *buftype = resp_buftype[1];
2197 
2198  qic_exit:
2199         SMB2_open_free(&rqst[0]);
2200         SMB2_query_info_free(&rqst[1]);
2201         SMB2_close_free(&rqst[2]);
2202         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2203         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
2204         return rc;
2205 }
2206 
2207 static int
2208 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2209              struct kstatfs *buf)
2210 {
2211         struct smb2_query_info_rsp *rsp;
2212         struct smb2_fs_full_size_info *info = NULL;
2213         __le16 utf16_path = 0; /* Null - open root of share */
2214         struct kvec rsp_iov = {NULL, 0};
2215         int buftype = CIFS_NO_BUFFER;
2216         int rc;
2217 
2218 
2219         rc = smb2_query_info_compound(xid, tcon, &utf16_path,
2220                                       FILE_READ_ATTRIBUTES,
2221                                       FS_FULL_SIZE_INFORMATION,
2222                                       SMB2_O_INFO_FILESYSTEM,
2223                                       sizeof(struct smb2_fs_full_size_info),
2224                                       &rsp_iov, &buftype, NULL);
2225         if (rc)
2226                 goto qfs_exit;
2227 
2228         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2229         buf->f_type = SMB2_MAGIC_NUMBER;
2230         info = (struct smb2_fs_full_size_info *)(
2231                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
2232         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
2233                                le32_to_cpu(rsp->OutputBufferLength),
2234                                &rsp_iov,
2235                                sizeof(struct smb2_fs_full_size_info));
2236         if (!rc)
2237                 smb2_copy_fs_info_to_kstatfs(info, buf);
2238 
2239 qfs_exit:
2240         free_rsp_buf(buftype, rsp_iov.iov_base);
2241         return rc;
2242 }
2243 
2244 static int
2245 smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2246              struct kstatfs *buf)
2247 {
2248         int rc;
2249         __le16 srch_path = 0; /* Null - open root of share */
2250         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2251         struct cifs_open_parms oparms;
2252         struct cifs_fid fid;
2253 
2254         if (!tcon->posix_extensions)
2255                 return smb2_queryfs(xid, tcon, buf);
2256 
2257         oparms.tcon = tcon;
2258         oparms.desired_access = FILE_READ_ATTRIBUTES;
2259         oparms.disposition = FILE_OPEN;
2260         oparms.create_options = 0;
2261         oparms.fid = &fid;
2262         oparms.reconnect = false;
2263 
2264         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
2265         if (rc)
2266                 return rc;
2267 
2268         rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
2269                                    fid.volatile_fid, buf);
2270         buf->f_type = SMB2_MAGIC_NUMBER;
2271         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2272         return rc;
2273 }
2274 
2275 static bool
2276 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
2277 {
2278         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
2279                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
2280 }
2281 
2282 static int
2283 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
2284                __u64 length, __u32 type, int lock, int unlock, bool wait)
2285 {
2286         if (unlock && !lock)
2287                 type = SMB2_LOCKFLAG_UNLOCK;
2288         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
2289                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
2290                          current->tgid, length, offset, type, wait);
2291 }
2292 
2293 static void
2294 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
2295 {
2296         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
2297 }
2298 
2299 static void
2300 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
2301 {
2302         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
2303 }
2304 
2305 static void
2306 smb2_new_lease_key(struct cifs_fid *fid)
2307 {
2308         generate_random_uuid(fid->lease_key);
2309 }
2310 
2311 static int
2312 smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
2313                    const char *search_name,
2314                    struct dfs_info3_param **target_nodes,
2315                    unsigned int *num_of_nodes,
2316                    const struct nls_table *nls_codepage, int remap)
2317 {
2318         int rc;
2319         __le16 *utf16_path = NULL;
2320         int utf16_path_len = 0;
2321         struct cifs_tcon *tcon;
2322         struct fsctl_get_dfs_referral_req *dfs_req = NULL;
2323         struct get_dfs_referral_rsp *dfs_rsp = NULL;
2324         u32 dfs_req_size = 0, dfs_rsp_size = 0;
2325 
2326         cifs_dbg(FYI, "smb2_get_dfs_refer path <%s>\n", search_name);
2327 
2328         /*
2329          * Try to use the IPC tcon, otherwise just use any
2330          */
2331         tcon = ses->tcon_ipc;
2332         if (tcon == NULL) {
2333                 spin_lock(&cifs_tcp_ses_lock);
2334                 tcon = list_first_entry_or_null(&ses->tcon_list,
2335                                                 struct cifs_tcon,
2336                                                 tcon_list);
2337                 if (tcon)
2338                         tcon->tc_count++;
2339                 spin_unlock(&cifs_tcp_ses_lock);
2340         }
2341 
2342         if (tcon == NULL) {
2343                 cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
2344                          ses);
2345                 rc = -ENOTCONN;
2346                 goto out;
2347         }
2348 
2349         utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
2350                                            &utf16_path_len,
2351                                            nls_codepage, remap);
2352         if (!utf16_path) {
2353                 rc = -ENOMEM;
2354                 goto out;
2355         }
2356 
2357         dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
2358         dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
2359         if (!dfs_req) {
2360                 rc = -ENOMEM;
2361                 goto out;
2362         }
2363 
2364         /* Highest DFS referral version understood */
2365         dfs_req->MaxReferralLevel = DFS_VERSION;
2366 
2367         /* Path to resolve in an UTF-16 null-terminated string */
2368         memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
2369 
2370         do {
2371                 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
2372                                 FSCTL_DFS_GET_REFERRALS,
2373                                 true /* is_fsctl */,
2374                                 (char *)dfs_req, dfs_req_size, CIFSMaxBufSize,
2375                                 (char **)&dfs_rsp, &dfs_rsp_size);
2376         } while (rc == -EAGAIN);
2377 
2378         if (rc) {
2379                 if ((rc != -ENOENT) && (rc != -EOPNOTSUPP))
2380                         cifs_dbg(VFS, "ioctl error in smb2_get_dfs_refer rc=%d\n", rc);
2381                 goto out;
2382         }
2383 
2384         rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
2385                                  num_of_nodes, target_nodes,
2386                                  nls_codepage, remap, search_name,
2387                                  true /* is_unicode */);
2388         if (rc) {
2389                 cifs_dbg(VFS, "parse error in smb2_get_dfs_refer rc=%d\n", rc);
2390                 goto out;
2391         }
2392 
2393  out:
2394         if (tcon && !tcon->ipc) {
2395                 /* ipc tcons are not refcounted */
2396                 spin_lock(&cifs_tcp_ses_lock);
2397                 tcon->tc_count--;
2398                 spin_unlock(&cifs_tcp_ses_lock);
2399         }
2400         kfree(utf16_path);
2401         kfree(dfs_req);
2402         kfree(dfs_rsp);
2403         return rc;
2404 }
2405 #define SMB2_SYMLINK_STRUCT_SIZE \
2406         (sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
2407 
2408 static int
2409 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
2410                    const char *full_path, char **target_path,
2411                    struct cifs_sb_info *cifs_sb)
2412 {
2413         int rc;
2414         __le16 *utf16_path;
2415         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2416         struct cifs_open_parms oparms;
2417         struct cifs_fid fid;
2418         struct kvec err_iov = {NULL, 0};
2419         struct smb2_err_rsp *err_buf = NULL;
2420         int resp_buftype;
2421         struct smb2_symlink_err_rsp *symlink;
2422         unsigned int sub_len;
2423         unsigned int sub_offset;
2424         unsigned int print_len;
2425         unsigned int print_offset;
2426 
2427         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
2428 
2429         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2430         if (!utf16_path)
2431                 return -ENOMEM;
2432 
2433         oparms.tcon = tcon;
2434         oparms.desired_access = FILE_READ_ATTRIBUTES;
2435         oparms.disposition = FILE_OPEN;
2436         if (backup_cred(cifs_sb))
2437                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2438         else
2439                 oparms.create_options = 0;
2440         oparms.fid = &fid;
2441         oparms.reconnect = false;
2442 
2443         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_iov,
2444                        &resp_buftype);
2445         if (!rc)
2446                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2447         if (!rc || !err_iov.iov_base) {
2448                 rc = -ENOENT;
2449                 goto free_path;
2450         }
2451 
2452         err_buf = err_iov.iov_base;
2453         if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
2454             err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE) {
2455                 rc = -ENOENT;
2456                 goto querty_exit;
2457         }
2458 
2459         /* open must fail on symlink - reset rc */
2460         rc = 0;
2461         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
2462         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
2463         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
2464         print_len = le16_to_cpu(symlink->PrintNameLength);
2465         print_offset = le16_to_cpu(symlink->PrintNameOffset);
2466 
2467         if (err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
2468                 rc = -ENOENT;
2469                 goto querty_exit;
2470         }
2471 
2472         if (err_iov.iov_len <
2473             SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
2474                 rc = -ENOENT;
2475                 goto querty_exit;
2476         }
2477 
2478         *target_path = cifs_strndup_from_utf16(
2479                                 (char *)symlink->PathBuffer + sub_offset,
2480                                 sub_len, true, cifs_sb->local_nls);
2481         if (!(*target_path)) {
2482                 rc = -ENOMEM;
2483                 goto querty_exit;
2484         }
2485         convert_delimiter(*target_path, '/');
2486         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2487 
2488  querty_exit:
2489         free_rsp_buf(resp_buftype, err_buf);
2490  free_path:
2491         kfree(utf16_path);
2492         return rc;
2493 }
2494 
2495 #ifdef CONFIG_CIFS_ACL
2496 static struct cifs_ntsd *
2497 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
2498                 const struct cifs_fid *cifsfid, u32 *pacllen)
2499 {
2500         struct cifs_ntsd *pntsd = NULL;
2501         unsigned int xid;
2502         int rc = -EOPNOTSUPP;
2503         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2504 
2505         if (IS_ERR(tlink))
2506                 return ERR_CAST(tlink);
2507 
2508         xid = get_xid();
2509         cifs_dbg(FYI, "trying to get acl\n");
2510 
2511         rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
2512                             cifsfid->volatile_fid, (void **)&pntsd, pacllen);
2513         free_xid(xid);
2514 
2515         cifs_put_tlink(tlink);
2516 
2517         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
2518         if (rc)
2519                 return ERR_PTR(rc);
2520         return pntsd;
2521 
2522 }
2523 
2524 static struct cifs_ntsd *
2525 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
2526                 const char *path, u32 *pacllen)
2527 {
2528         struct cifs_ntsd *pntsd = NULL;
2529         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2530         unsigned int xid;
2531         int rc;
2532         struct cifs_tcon *tcon;
2533         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2534         struct cifs_fid fid;
2535         struct cifs_open_parms oparms;
2536         __le16 *utf16_path;
2537 
2538         cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
2539         if (IS_ERR(tlink))
2540                 return ERR_CAST(tlink);
2541 
2542         tcon = tlink_tcon(tlink);
2543         xid = get_xid();
2544 
2545         if (backup_cred(cifs_sb))
2546                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2547         else
2548                 oparms.create_options = 0;
2549 
2550         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2551         if (!utf16_path) {
2552                 rc = -ENOMEM;
2553                 free_xid(xid);
2554                 return ERR_PTR(rc);
2555         }
2556 
2557         oparms.tcon = tcon;
2558         oparms.desired_access = READ_CONTROL;
2559         oparms.disposition = FILE_OPEN;
2560         oparms.fid = &fid;
2561         oparms.reconnect = false;
2562 
2563         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2564         kfree(utf16_path);
2565         if (!rc) {
2566                 rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
2567                             fid.volatile_fid, (void **)&pntsd, pacllen);
2568                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2569         }
2570 
2571         cifs_put_tlink(tlink);
2572         free_xid(xid);
2573 
2574         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
2575         if (rc)
2576                 return ERR_PTR(rc);
2577         return pntsd;
2578 }
2579 
2580 #ifdef CONFIG_CIFS_ACL
2581 static int
2582 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
2583                 struct inode *inode, const char *path, int aclflag)
2584 {
2585         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2586         unsigned int xid;
2587         int rc, access_flags = 0;
2588         struct cifs_tcon *tcon;
2589         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2590         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2591         struct cifs_fid fid;
2592         struct cifs_open_parms oparms;
2593         __le16 *utf16_path;
2594 
2595         cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
2596         if (IS_ERR(tlink))
2597                 return PTR_ERR(tlink);
2598 
2599         tcon = tlink_tcon(tlink);
2600         xid = get_xid();
2601 
2602         if (backup_cred(cifs_sb))
2603                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2604         else
2605                 oparms.create_options = 0;
2606 
2607         if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
2608                 access_flags = WRITE_OWNER;
2609         else
2610                 access_flags = WRITE_DAC;
2611 
2612         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2613         if (!utf16_path) {
2614                 rc = -ENOMEM;
2615                 free_xid(xid);
2616                 return rc;
2617         }
2618 
2619         oparms.tcon = tcon;
2620         oparms.desired_access = access_flags;
2621         oparms.disposition = FILE_OPEN;
2622         oparms.path = path;
2623         oparms.fid = &fid;
2624         oparms.reconnect = false;
2625 
2626         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2627         kfree(utf16_path);
2628         if (!rc) {
2629                 rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
2630                             fid.volatile_fid, pnntsd, acllen, aclflag);
2631                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2632         }
2633 
2634         cifs_put_tlink(tlink);
2635         free_xid(xid);
2636         return rc;
2637 }
2638 #endif /* CIFS_ACL */
2639 
2640 /* Retrieve an ACL from the server */
2641 static struct cifs_ntsd *
2642 get_smb2_acl(struct cifs_sb_info *cifs_sb,
2643                                       struct inode *inode, const char *path,
2644                                       u32 *pacllen)
2645 {
2646         struct cifs_ntsd *pntsd = NULL;
2647         struct cifsFileInfo *open_file = NULL;
2648 
2649         if (inode)
2650                 open_file = find_readable_file(CIFS_I(inode), true);
2651         if (!open_file)
2652                 return get_smb2_acl_by_path(cifs_sb, path, pacllen);
2653 
2654         pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
2655         cifsFileInfo_put(open_file);
2656         return pntsd;
2657 }
2658 #endif
2659 
2660 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
2661                             loff_t offset, loff_t len, bool keep_size)
2662 {
2663         struct cifs_ses *ses = tcon->ses;
2664         struct inode *inode;
2665         struct cifsInodeInfo *cifsi;
2666         struct cifsFileInfo *cfile = file->private_data;
2667         struct file_zero_data_information fsctl_buf;
2668         struct smb_rqst rqst[2];
2669         int resp_buftype[2];
2670         struct kvec rsp_iov[2];
2671         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
2672         struct kvec si_iov[1];
2673         unsigned int size[1];
2674         void *data[1];
2675         long rc;
2676         unsigned int xid;
2677         int num = 0, flags = 0;
2678         __le64 eof;
2679 
2680         xid = get_xid();
2681 
2682         inode = d_inode(cfile->dentry);
2683         cifsi = CIFS_I(inode);
2684 
2685         trace_smb3_zero_enter(xid, cfile->fid.persistent_fid, tcon->tid,
2686                               ses->Suid, offset, len);
2687 
2688 
2689         /* if file not oplocked can't be sure whether asking to extend size */
2690         if (!CIFS_CACHE_READ(cifsi))
2691                 if (keep_size == false) {
2692                         rc = -EOPNOTSUPP;
2693                         trace_smb3_zero_err(xid, cfile->fid.persistent_fid,
2694                                 tcon->tid, ses->Suid, offset, len, rc);
2695                         free_xid(xid);
2696                         return rc;
2697                 }
2698 
2699         /*
2700          * Must check if file sparse since fallocate -z (zero range) assumes
2701          * non-sparse allocation
2702          */
2703         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)) {
2704                 rc = -EOPNOTSUPP;
2705                 trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
2706                               ses->Suid, offset, len, rc);
2707                 free_xid(xid);
2708                 return rc;
2709         }
2710 
2711         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
2712 
2713         fsctl_buf.FileOffset = cpu_to_le64(offset);
2714         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
2715 
2716         if (smb3_encryption_required(tcon))
2717                 flags |= CIFS_TRANSFORM_REQ;
2718 
2719         memset(rqst, 0, sizeof(rqst));
2720         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
2721         memset(rsp_iov, 0, sizeof(rsp_iov));
2722 
2723 
2724         memset(&io_iov, 0, sizeof(io_iov));
2725         rqst[num].rq_iov = io_iov;
2726         rqst[num].rq_nvec = SMB2_IOCTL_IOV_SIZE;
2727         rc = SMB2_ioctl_init(tcon, &rqst[num++], cfile->fid.persistent_fid,
2728                              cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
2729                              true /* is_fctl */, (char *)&fsctl_buf,
2730                              sizeof(struct file_zero_data_information),
2731                              CIFSMaxBufSize);
2732         if (rc)
2733                 goto zero_range_exit;
2734 
2735         /*
2736          * do we also need to change the size of the file?
2737          */
2738         if (keep_size == false && i_size_read(inode) < offset + len) {
2739                 smb2_set_next_command(tcon, &rqst[0]);
2740 
2741                 memset(&si_iov, 0, sizeof(si_iov));
2742                 rqst[num].rq_iov = si_iov;
2743                 rqst[num].rq_nvec = 1;
2744 
2745                 eof = cpu_to_le64(offset + len);
2746                 size[0] = 8; /* sizeof __le64 */
2747                 data[0] = &eof;
2748 
2749                 rc = SMB2_set_info_init(tcon, &rqst[num++],
2750                                         cfile->fid.persistent_fid,
2751                                         cfile->fid.persistent_fid,
2752                                         current->tgid,
2753                                         FILE_END_OF_FILE_INFORMATION,
2754                                         SMB2_O_INFO_FILE, 0, data, size);
2755                 smb2_set_related(&rqst[1]);
2756         }
2757 
2758         rc = compound_send_recv(xid, ses, flags, num, rqst,
2759                                 resp_buftype, rsp_iov);
2760 
2761  zero_range_exit:
2762         SMB2_ioctl_free(&rqst[0]);
2763         SMB2_set_info_free(&rqst[1]);
2764         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2765         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2766         free_xid(xid);
2767         if (rc)
2768                 trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
2769                               ses->Suid, offset, len, rc);
2770         else
2771                 trace_smb3_zero_done(xid, cfile->fid.persistent_fid, tcon->tid,
2772                               ses->Suid, offset, len);
2773         return rc;
2774 }
2775 
2776 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
2777                             loff_t offset, loff_t len)
2778 {
2779         struct inode *inode;
2780         struct cifsInodeInfo *cifsi;
2781         struct cifsFileInfo *cfile = file->private_data;
2782         struct file_zero_data_information fsctl_buf;
2783         long rc;
2784         unsigned int xid;
2785         __u8 set_sparse = 1;
2786 
2787         xid = get_xid();
2788 
2789         inode = d_inode(cfile->dentry);
2790         cifsi = CIFS_I(inode);
2791 
2792         /* Need to make file sparse, if not already, before freeing range. */
2793         /* Consider adding equivalent for compressed since it could also work */
2794         if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
2795                 rc = -EOPNOTSUPP;
2796                 free_xid(xid);
2797                 return rc;
2798         }
2799 
2800         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
2801 
2802         fsctl_buf.FileOffset = cpu_to_le64(offset);
2803         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
2804 
2805         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2806                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
2807                         true /* is_fctl */, (char *)&fsctl_buf,
2808                         sizeof(struct file_zero_data_information),
2809                         CIFSMaxBufSize, NULL, NULL);
2810         free_xid(xid);
2811         return rc;
2812 }
2813 
2814 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
2815                             loff_t off, loff_t len, bool keep_size)
2816 {
2817         struct inode *inode;
2818         struct cifsInodeInfo *cifsi;
2819         struct cifsFileInfo *cfile = file->private_data;
2820         long rc = -EOPNOTSUPP;
2821         unsigned int xid;
2822         __le64 eof;
2823 
2824         xid = get_xid();
2825 
2826         inode = d_inode(cfile->dentry);
2827         cifsi = CIFS_I(inode);
2828 
2829         trace_smb3_falloc_enter(xid, cfile->fid.persistent_fid, tcon->tid,
2830                                 tcon->ses->Suid, off, len);
2831         /* if file not oplocked can't be sure whether asking to extend size */
2832         if (!CIFS_CACHE_READ(cifsi))
2833                 if (keep_size == false) {
2834                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2835                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2836                         free_xid(xid);
2837                         return rc;
2838                 }
2839 
2840         /*
2841          * Files are non-sparse by default so falloc may be a no-op
2842          * Must check if file sparse. If not sparse, and not extending
2843          * then no need to do anything since file already allocated
2844          */
2845         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
2846                 if (keep_size == true)
2847                         rc = 0;
2848                 /* check if extending file */
2849                 else if (i_size_read(inode) >= off + len)
2850                         /* not extending file and already not sparse */
2851                         rc = 0;
2852                 /* BB: in future add else clause to extend file */
2853                 else
2854                         rc = -EOPNOTSUPP;
2855                 if (rc)
2856                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2857                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2858                 else
2859                         trace_smb3_falloc_done(xid, cfile->fid.persistent_fid,
2860                                 tcon->tid, tcon->ses->Suid, off, len);
2861                 free_xid(xid);
2862                 return rc;
2863         }
2864 
2865         if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
2866                 /*
2867                  * Check if falloc starts within first few pages of file
2868                  * and ends within a few pages of the end of file to
2869                  * ensure that most of file is being forced to be
2870                  * fallocated now. If so then setting whole file sparse
2871                  * ie potentially making a few extra pages at the beginning
2872                  * or end of the file non-sparse via set_sparse is harmless.
2873                  */
2874                 if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
2875                         rc = -EOPNOTSUPP;
2876                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2877                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2878                         free_xid(xid);
2879                         return rc;
2880                 }
2881 
2882                 smb2_set_sparse(xid, tcon, cfile, inode, false);
2883                 rc = 0;
2884         } else {
2885                 smb2_set_sparse(xid, tcon, cfile, inode, false);
2886                 rc = 0;
2887                 if (i_size_read(inode) < off + len) {
2888                         eof = cpu_to_le64(off + len);
2889                         rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
2890                                           cfile->fid.volatile_fid, cfile->pid,
2891                                           &eof);
2892                 }
2893         }
2894 
2895         if (rc)
2896                 trace_smb3_falloc_err(xid, cfile->fid.persistent_fid, tcon->tid,
2897                                 tcon->ses->Suid, off, len, rc);
2898         else
2899                 trace_smb3_falloc_done(xid, cfile->fid.persistent_fid, tcon->tid,
2900                                 tcon->ses->Suid, off, len);
2901 
2902         free_xid(xid);
2903         return rc;
2904 }
2905 
2906 
2907 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
2908                            loff_t off, loff_t len)
2909 {
2910         /* KEEP_SIZE already checked for by do_fallocate */
2911         if (mode & FALLOC_FL_PUNCH_HOLE)
2912                 return smb3_punch_hole(file, tcon, off, len);
2913         else if (mode & FALLOC_FL_ZERO_RANGE) {
2914                 if (mode & FALLOC_FL_KEEP_SIZE)
2915                         return smb3_zero_range(file, tcon, off, len, true);
2916                 return smb3_zero_range(file, tcon, off, len, false);
2917         } else if (mode == FALLOC_FL_KEEP_SIZE)
2918                 return smb3_simple_falloc(file, tcon, off, len, true);
2919         else if (mode == 0)
2920                 return smb3_simple_falloc(file, tcon, off, len, false);
2921 
2922         return -EOPNOTSUPP;
2923 }
2924 
2925 static void
2926 smb2_downgrade_oplock(struct TCP_Server_Info *server,
2927                         struct cifsInodeInfo *cinode, bool set_level2)
2928 {
2929         if (set_level2)
2930                 server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
2931                                                 0, NULL);
2932         else
2933                 server->ops->set_oplock_level(cinode, 0, 0, NULL);
2934 }
2935 
2936 static void
2937 smb21_downgrade_oplock(struct TCP_Server_Info *server,
2938                        struct cifsInodeInfo *cinode, bool set_level2)
2939 {
2940         server->ops->set_oplock_level(cinode,
2941                                       set_level2 ? SMB2_LEASE_READ_CACHING_HE :
2942                                       0, 0, NULL);
2943 }
2944 
2945 static void
2946 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
2947                       unsigned int epoch, bool *purge_cache)
2948 {
2949         oplock &= 0xFF;
2950         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
2951                 return;
2952         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2953                 cinode->oplock = CIFS_CACHE_RHW_FLG;
2954                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
2955                          &cinode->vfs_inode);
2956         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
2957                 cinode->oplock = CIFS_CACHE_RW_FLG;
2958                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
2959                          &cinode->vfs_inode);
2960         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
2961                 cinode->oplock = CIFS_CACHE_READ_FLG;
2962                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
2963                          &cinode->vfs_inode);
2964         } else
2965                 cinode->oplock = 0;
2966 }
2967 
2968 static void
2969 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
2970                        unsigned int epoch, bool *purge_cache)
2971 {
2972         char message[5] = {0};
2973         unsigned int new_oplock = 0;
2974 
2975         oplock &= 0xFF;
2976         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
2977                 return;
2978 
2979         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
2980                 new_oplock |= CIFS_CACHE_READ_FLG;
2981                 strcat(message, "R");
2982         }
2983         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
2984                 new_oplock |= CIFS_CACHE_HANDLE_FLG;
2985                 strcat(message, "H");
2986         }
2987         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
2988                 new_oplock |= CIFS_CACHE_WRITE_FLG;
2989                 strcat(message, "W");
2990         }
2991         if (!new_oplock)
2992                 strncpy(message, "None", sizeof(message));
2993 
2994         cinode->oplock = new_oplock;
2995         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
2996                  &cinode->vfs_inode);
2997 }
2998 
2999 static void
3000 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3001                       unsigned int epoch, bool *purge_cache)
3002 {
3003         unsigned int old_oplock = cinode->oplock;
3004 
3005         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
3006 
3007         if (purge_cache) {
3008                 *purge_cache = false;
3009                 if (old_oplock == CIFS_CACHE_READ_FLG) {
3010                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
3011                             (epoch - cinode->epoch > 0))
3012                                 *purge_cache = true;
3013                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
3014                                  (epoch - cinode->epoch > 1))
3015                                 *purge_cache = true;
3016                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
3017                                  (epoch - cinode->epoch > 1))
3018                                 *purge_cache = true;
3019                         else if (cinode->oplock == 0 &&
3020                                  (epoch - cinode->epoch > 0))
3021                                 *purge_cache = true;
3022                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
3023                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
3024                             (epoch - cinode->epoch > 0))
3025                                 *purge_cache = true;
3026                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
3027                                  (epoch - cinode->epoch > 1))
3028                                 *purge_cache = true;
3029                 }
3030                 cinode->epoch = epoch;
3031         }
3032 }
3033 
3034 static bool
3035 smb2_is_read_op(__u32 oplock)
3036 {
3037         return oplock == SMB2_OPLOCK_LEVEL_II;
3038 }
3039 
3040 static bool
3041 smb21_is_read_op(__u32 oplock)
3042 {
3043         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
3044                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
3045 }
3046 
3047 static __le32
3048 map_oplock_to_lease(u8 oplock)
3049 {
3050         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
3051                 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
3052         else if (oplock == SMB2_OPLOCK_LEVEL_II)
3053                 return SMB2_LEASE_READ_CACHING;
3054         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
3055                 return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
3056                        SMB2_LEASE_WRITE_CACHING;
3057         return 0;
3058 }
3059 
3060 static char *
3061 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
3062 {
3063         struct create_lease *buf;
3064 
3065         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
3066         if (!buf)
3067                 return NULL;
3068 
3069         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3070         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3071 
3072         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3073                                         (struct create_lease, lcontext));
3074         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
3075         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3076                                 (struct create_lease, Name));
3077         buf->ccontext.NameLength = cpu_to_le16(4);
3078         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3079         buf->Name[0] = 'R';
3080         buf->Name[1] = 'q';
3081         buf->Name[2] = 'L';
3082         buf->Name[3] = 's';
3083         return (char *)buf;
3084 }
3085 
3086 static char *
3087 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
3088 {
3089         struct create_lease_v2 *buf;
3090 
3091         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
3092         if (!buf)
3093                 return NULL;
3094 
3095         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3096         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3097 
3098         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3099                                         (struct create_lease_v2, lcontext));
3100         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
3101         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3102                                 (struct create_lease_v2, Name));
3103         buf->ccontext.NameLength = cpu_to_le16(4);
3104         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3105         buf->Name[0] = 'R';
3106         buf->Name[1] = 'q';
3107         buf->Name[2] = 'L';
3108         buf->Name[3] = 's';
3109         return (char *)buf;
3110 }
3111 
3112 static __u8
3113 smb2_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3114 {
3115         struct create_lease *lc = (struct create_lease *)buf;
3116 
3117         *epoch = 0; /* not used */
3118         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3119                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3120         return le32_to_cpu(lc->lcontext.LeaseState);
3121 }
3122 
3123 static __u8
3124 smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3125 {
3126         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
3127 
3128         *epoch = le16_to_cpu(lc->lcontext.Epoch);
3129         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3130                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3131         if (lease_key)
3132                 memcpy(lease_key, &lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
3133         return le32_to_cpu(lc->lcontext.LeaseState);
3134 }
3135 
3136 static unsigned int
3137 smb2_wp_retry_size(struct inode *inode)
3138 {
3139         return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
3140                      SMB2_MAX_BUFFER_SIZE);
3141 }
3142 
3143 static bool
3144 smb2_dir_needs_close(struct cifsFileInfo *cfile)
3145 {
3146         return !cfile->invalidHandle;
3147 }
3148 
3149 static void
3150 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
3151                    struct smb_rqst *old_rq)
3152 {
3153         struct smb2_sync_hdr *shdr =
3154                         (struct smb2_sync_hdr *)old_rq->rq_iov[0].iov_base;
3155 
3156         memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
3157         tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
3158         tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
3159         tr_hdr->Flags = cpu_to_le16(0x01);
3160         get_random_bytes(&tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
3161         memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
3162 }
3163 
3164 /* We can not use the normal sg_set_buf() as we will sometimes pass a
3165  * stack object as buf.
3166  */
3167 static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
3168                                    unsigned int buflen)
3169 {
3170         sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
3171 }
3172 
3173 /* Assumes the first rqst has a transform header as the first iov.
3174  * I.e.
3175  * rqst[0].rq_iov[0]  is transform header
3176  * rqst[0].rq_iov[1+] data to be encrypted/decrypted
3177  * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
3178  */
3179 static struct scatterlist *
3180 init_sg(int num_rqst, struct smb_rqst *rqst, u8 *sign)
3181 {
3182         unsigned int sg_len;
3183         struct scatterlist *sg;
3184         unsigned int i;
3185         unsigned int j;
3186         unsigned int idx = 0;
3187         int skip;
3188 
3189         sg_len = 1;
3190         for (i = 0; i < num_rqst; i++)
3191                 sg_len += rqst[i].rq_nvec + rqst[i].rq_npages;
3192 
3193         sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
3194         if (!sg)
3195                 return NULL;
3196 
3197         sg_init_table(sg, sg_len);
3198         for (i = 0; i < num_rqst; i++) {
3199                 for (j = 0; j < rqst[i].rq_nvec; j++) {
3200                         /*
3201                          * The first rqst has a transform header where the
3202                          * first 20 bytes are not part of the encrypted blob
3203                          */
3204                         skip = (i == 0) && (j == 0) ? 20 : 0;
3205                         smb2_sg_set_buf(&sg[idx++],
3206                                         rqst[i].rq_iov[j].iov_base + skip,
3207                                         rqst[i].rq_iov[j].iov_len - skip);
3208                         }
3209 
3210                 for (j = 0; j < rqst[i].rq_npages; j++) {
3211                         unsigned int len, offset;
3212 
3213                         rqst_page_get_length(&rqst[i], j, &len, &offset);
3214                         sg_set_page(&sg[idx++], rqst[i].rq_pages[j], len, offset);
3215                 }
3216         }
3217         smb2_sg_set_buf(&sg[idx], sign, SMB2_SIGNATURE_SIZE);
3218         return sg;
3219 }
3220 
3221 static int
3222 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
3223 {
3224         struct cifs_ses *ses;
3225         u8 *ses_enc_key;
3226 
3227         spin_lock(&cifs_tcp_ses_lock);
3228         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3229                 if (ses->Suid != ses_id)
3230                         continue;
3231                 ses_enc_key = enc ? ses->smb3encryptionkey :
3232                                                         ses->smb3decryptionkey;
3233                 memcpy(key, ses_enc_key, SMB3_SIGN_KEY_SIZE);
3234                 spin_unlock(&cifs_tcp_ses_lock);
3235                 return 0;
3236         }
3237         spin_unlock(&cifs_tcp_ses_lock);
3238 
3239         return 1;
3240 }
3241 /*
3242  * Encrypt or decrypt @rqst message. @rqst[0] has the following format:
3243  * iov[0]   - transform header (associate data),
3244  * iov[1-N] - SMB2 header and pages - data to encrypt.
3245  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
3246  * untouched.
3247  */
3248 static int
3249 crypt_message(struct TCP_Server_Info *server, int num_rqst,
3250               struct smb_rqst *rqst, int enc)
3251 {
3252         struct smb2_transform_hdr *tr_hdr =
3253                 (struct smb2_transform_hdr *)rqst[0].rq_iov[0].iov_base;
3254         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
3255         int rc = 0;
3256         struct scatterlist *sg;
3257         u8 sign[SMB2_SIGNATURE_SIZE] = {};
3258         u8 key[SMB3_SIGN_KEY_SIZE];
3259         struct aead_request *req;
3260         char *iv;
3261         unsigned int iv_len;
3262         DECLARE_CRYPTO_WAIT(wait);
3263         struct crypto_aead *tfm;
3264         unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
3265 
3266         rc = smb2_get_enc_key(server, tr_hdr->SessionId, enc, key);
3267         if (rc) {
3268                 cifs_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
3269                          enc ? "en" : "de");
3270                 return 0;
3271         }
3272 
3273         rc = smb3_crypto_aead_allocate(server);
3274         if (rc) {
3275                 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
3276                 return rc;
3277         }
3278 
3279         tfm = enc ? server->secmech.ccmaesencrypt :
3280                                                 server->secmech.ccmaesdecrypt;
3281         rc = crypto_aead_setkey(tfm, key, SMB3_SIGN_KEY_SIZE);
3282         if (rc) {
3283                 cifs_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
3284                 return rc;
3285         }
3286 
3287         rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
3288         if (rc) {
3289                 cifs_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
3290                 return rc;
3291         }
3292 
3293         req = aead_request_alloc(tfm, GFP_KERNEL);
3294         if (!req) {
3295                 cifs_dbg(VFS, "%s: Failed to alloc aead request", __func__);
3296                 return -ENOMEM;
3297         }
3298 
3299         if (!enc) {
3300                 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
3301                 crypt_len += SMB2_SIGNATURE_SIZE;
3302         }
3303 
3304         sg = init_sg(num_rqst, rqst, sign);
3305         if (!sg) {
3306                 cifs_dbg(VFS, "%s: Failed to init sg", __func__);
3307                 rc = -ENOMEM;
3308                 goto free_req;
3309         }
3310 
3311         iv_len = crypto_aead_ivsize(tfm);
3312         iv = kzalloc(iv_len, GFP_KERNEL);
3313         if (!iv) {
3314                 cifs_dbg(VFS, "%s: Failed to alloc IV", __func__);
3315                 rc = -ENOMEM;
3316                 goto free_sg;
3317         }
3318         iv[0] = 3;
3319         memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
3320 
3321         aead_request_set_crypt(req, sg, sg, crypt_len, iv);
3322         aead_request_set_ad(req, assoc_data_len);
3323 
3324         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
3325                                   crypto_req_done, &wait);
3326 
3327         rc = crypto_wait_req(enc ? crypto_aead_encrypt(req)
3328                                 : crypto_aead_decrypt(req), &wait);
3329 
3330         if (!rc && enc)
3331                 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
3332 
3333         kfree(iv);
3334 free_sg:
3335         kfree(sg);
3336 free_req:
3337         kfree(req);
3338         return rc;
3339 }
3340 
3341 void
3342 smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
3343 {
3344         int i, j;
3345 
3346         for (i = 0; i < num_rqst; i++) {
3347                 if (rqst[i].rq_pages) {
3348                         for (j = rqst[i].rq_npages - 1; j >= 0; j--)
3349                                 put_page(rqst[i].rq_pages[j]);
3350                         kfree(rqst[i].rq_pages);
3351                 }
3352         }
3353 }
3354 
3355 /*
3356  * This function will initialize new_rq and encrypt the content.
3357  * The first entry, new_rq[0], only contains a single iov which contains
3358  * a smb2_transform_hdr and is pre-allocated by the caller.
3359  * This function then populates new_rq[1+] with the content from olq_rq[0+].
3360  *
3361  * The end result is an array of smb_rqst structures where the first structure
3362  * only contains a single iov for the transform header which we then can pass
3363  * to crypt_message().
3364  *
3365  * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
3366  * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
3367  */
3368 static int
3369 smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
3370                        struct smb_rqst *new_rq, struct smb_rqst *old_rq)
3371 {
3372         struct page **pages;
3373         struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
3374         unsigned int npages;
3375         unsigned int orig_len = 0;
3376         int i, j;
3377         int rc = -ENOMEM;
3378 
3379         for (i = 1; i < num_rqst; i++) {
3380                 npages = old_rq[i - 1].rq_npages;
3381                 pages = kmalloc_array(npages, sizeof(struct page *),
3382                                       GFP_KERNEL);
3383                 if (!pages)
3384                         goto err_free;
3385 
3386                 new_rq[i].rq_pages = pages;
3387                 new_rq[i].rq_npages = npages;
3388                 new_rq[i].rq_offset = old_rq[i - 1].rq_offset;
3389                 new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz;
3390                 new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz;
3391                 new_rq[i].rq_iov = old_rq[i - 1].rq_iov;
3392                 new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec;
3393 
3394                 orig_len += smb_rqst_len(server, &old_rq[i - 1]);
3395 
3396                 for (j = 0; j < npages; j++) {
3397                         pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
3398                         if (!pages[j])
3399                                 goto err_free;
3400                 }
3401 
3402                 /* copy pages form the old */
3403                 for (j = 0; j < npages; j++) {
3404                         char *dst, *src;
3405                         unsigned int offset, len;
3406 
3407                         rqst_page_get_length(&new_rq[i], j, &len, &offset);
3408 
3409                         dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset;
3410                         src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset;
3411 
3412                         memcpy(dst, src, len);
3413                         kunmap(new_rq[i].rq_pages[j]);
3414                         kunmap(old_rq[i - 1].rq_pages[j]);
3415                 }
3416         }
3417 
3418         /* fill the 1st iov with a transform header */
3419         fill_transform_hdr(tr_hdr, orig_len, old_rq);
3420 
3421         rc = crypt_message(server, num_rqst, new_rq, 1);
3422         cifs_dbg(FYI, "encrypt message returned %d", rc);
3423         if (rc)
3424                 goto err_free;
3425 
3426         return rc;
3427 
3428 err_free:
3429         smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
3430         return rc;
3431 }
3432 
3433 static int
3434 smb3_is_transform_hdr(void *buf)
3435 {
3436         struct smb2_transform_hdr *trhdr = buf;
3437 
3438         return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
3439 }
3440 
3441 static int
3442 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
3443                  unsigned int buf_data_size, struct page **pages,
3444                  unsigned int npages, unsigned int page_data_size)
3445 {
3446         struct kvec iov[2];
3447         struct smb_rqst rqst = {NULL};
3448         int rc;
3449 
3450         iov[0].iov_base = buf;
3451         iov[0].iov_len = sizeof(struct smb2_transform_hdr);
3452         iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
3453         iov[1].iov_len = buf_data_size;
3454 
3455         rqst.rq_iov = iov;
3456         rqst.rq_nvec = 2;
3457         rqst.rq_pages = pages;
3458         rqst.rq_npages = npages;
3459         rqst.rq_pagesz = PAGE_SIZE;
3460         rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
3461 
3462         rc = crypt_message(server, 1, &rqst, 0);
3463         cifs_dbg(FYI, "decrypt message returned %d\n", rc);
3464 
3465         if (rc)
3466                 return rc;
3467 
3468         memmove(buf, iov[1].iov_base, buf_data_size);
3469 
3470         server->total_read = buf_data_size + page_data_size;
3471 
3472         return rc;
3473 }
3474 
3475 static int
3476 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
3477                      unsigned int npages, unsigned int len)
3478 {
3479         int i;
3480         int length;
3481 
3482         for (i = 0; i < npages; i++) {
3483                 struct page *page = pages[i];
3484                 size_t n;
3485 
3486                 n = len;
3487                 if (len >= PAGE_SIZE) {
3488                         /* enough data to fill the page */
3489                         n = PAGE_SIZE;
3490                         len -= n;
3491                 } else {
3492                         zero_user(page, len, PAGE_SIZE - len);
3493                         len = 0;
3494                 }
3495                 length = cifs_read_page_from_socket(server, page, 0, n);
3496                 if (length < 0)
3497                         return length;
3498                 server->total_read += length;
3499         }
3500 
3501         return 0;
3502 }
3503 
3504 static int
3505 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
3506                unsigned int cur_off, struct bio_vec **page_vec)
3507 {
3508         struct bio_vec *bvec;
3509         int i;
3510 
3511         bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
3512         if (!bvec)
3513                 return -ENOMEM;
3514 
3515         for (i = 0; i < npages; i++) {
3516                 bvec[i].bv_page = pages[i];
3517                 bvec[i].bv_offset = (i == 0) ? cur_off : 0;
3518                 bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
3519                 data_size -= bvec[i].bv_len;
3520         }
3521 
3522         if (data_size != 0) {
3523                 cifs_dbg(VFS, "%s: something went wrong\n", __func__);
3524                 kfree(bvec);
3525                 return -EIO;
3526         }
3527 
3528         *page_vec = bvec;
3529         return 0;
3530 }
3531 
3532 static int
3533 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
3534                  char *buf, unsigned int buf_len, struct page **pages,
3535                  unsigned int npages, unsigned int page_data_size)
3536 {
3537         unsigned int data_offset;
3538         unsigned int data_len;
3539         unsigned int cur_off;
3540         unsigned int cur_page_idx;
3541         unsigned int pad_len;
3542         struct cifs_readdata *rdata = mid->callback_data;
3543         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
3544         struct bio_vec *bvec = NULL;
3545         struct iov_iter iter;
3546         struct kvec iov;
3547         int length;
3548         bool use_rdma_mr = false;
3549 
3550         if (shdr->Command != SMB2_READ) {
3551                 cifs_dbg(VFS, "only big read responses are supported\n");
3552                 return -ENOTSUPP;
3553         }
3554 
3555         if (server->ops->is_session_expired &&
3556             server->ops->is_session_expired(buf)) {
3557                 cifs_reconnect(server);
3558                 wake_up(&server->response_q);
3559                 return -1;
3560         }
3561 
3562         if (server->ops->is_status_pending &&
3563                         server->ops->is_status_pending(buf, server))
3564                 return -1;
3565 
3566         /* set up first two iov to get credits */
3567         rdata->iov[0].iov_base = buf;
3568         rdata->iov[0].iov_len = 0;
3569         rdata->iov[1].iov_base = buf;
3570         rdata->iov[1].iov_len =
3571                 min_t(unsigned int, buf_len, server->vals->read_rsp_size);
3572         cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
3573                  rdata->iov[0].iov_base, rdata->iov[0].iov_len);
3574         cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
3575                  rdata->iov[1].iov_base, rdata->iov[1].iov_len);
3576 
3577         rdata->result = server->ops->map_error(buf, true);
3578         if (rdata->result != 0) {
3579                 cifs_dbg(FYI, "%s: server returned error %d\n",
3580                          __func__, rdata->result);
3581                 /* normal error on read response */
3582                 dequeue_mid(mid, false);
3583                 return 0;
3584         }
3585 
3586         data_offset = server->ops->read_data_offset(buf);
3587 #ifdef CONFIG_CIFS_SMB_DIRECT
3588         use_rdma_mr = rdata->mr;
3589 #endif
3590         data_len = server->ops->read_data_length(buf, use_rdma_mr);
3591 
3592         if (data_offset < server->vals->read_rsp_size) {
3593                 /*
3594                  * win2k8 sometimes sends an offset of 0 when the read
3595                  * is beyond the EOF. Treat it as if the data starts just after
3596                  * the header.
3597                  */
3598                 cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
3599                          __func__, data_offset);
3600                 data_offset = server->vals->read_rsp_size;
3601         } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
3602                 /* data_offset is beyond the end of smallbuf */
3603                 cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
3604                          __func__, data_offset);
3605                 rdata->result = -EIO;
3606                 dequeue_mid(mid, rdata->result);
3607                 return 0;
3608         }
3609 
3610         pad_len = data_offset - server->vals->read_rsp_size;
3611 
3612         if (buf_len <= data_offset) {
3613                 /* read response payload is in pages */
3614                 cur_page_idx = pad_len / PAGE_SIZE;
3615                 cur_off = pad_len % PAGE_SIZE;
3616 
3617                 if (cur_page_idx != 0) {
3618                         /* data offset is beyond the 1st page of response */
3619                         cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
3620                                  __func__, data_offset);
3621                         rdata->result = -EIO;
3622                         dequeue_mid(mid, rdata->result);
3623                         return 0;
3624                 }
3625 
3626                 if (data_len > page_data_size - pad_len) {
3627                         /* data_len is corrupt -- discard frame */
3628                         rdata->result = -EIO;
3629                         dequeue_mid(mid, rdata->result);
3630                         return 0;
3631                 }
3632 
3633                 rdata->result = init_read_bvec(pages, npages, page_data_size,
3634                                                cur_off, &bvec);
3635                 if (rdata->result != 0) {
3636                         dequeue_mid(mid, rdata->result);
3637                         return 0;
3638                 }
3639 
3640                 iov_iter_bvec(&iter, WRITE, bvec, npages, data_len);
3641         } else if (buf_len >= data_offset + data_len) {
3642                 /* read response payload is in buf */
3643                 WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
3644                 iov.iov_base = buf + data_offset;
3645                 iov.iov_len = data_len;
3646                 iov_iter_kvec(&iter, WRITE, &iov, 1, data_len);
3647         } else {
3648                 /* read response payload cannot be in both buf and pages */
3649                 WARN_ONCE(1, "buf can not contain only a part of read data");
3650                 rdata->result = -EIO;
3651                 dequeue_mid(mid, rdata->result);
3652                 return 0;
3653         }
3654 
3655         length = rdata->copy_into_pages(server, rdata, &iter);
3656 
3657         kfree(bvec);
3658 
3659         if (length < 0)
3660                 return length;
3661 
3662         dequeue_mid(mid, false);
3663         return length;
3664 }
3665 
3666 static int
3667 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
3668 {
3669         char *buf = server->smallbuf;
3670         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
3671         unsigned int npages;
3672         struct page **pages;
3673         unsigned int len;
3674         unsigned int buflen = server->pdu_size;
3675         int rc;
3676         int i = 0;
3677 
3678         len = min_t(unsigned int, buflen, server->vals->read_rsp_size +
3679                 sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
3680 
3681         rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
3682         if (rc < 0)
3683                 return rc;
3684         server->total_read += rc;
3685 
3686         len = le32_to_cpu(tr_hdr->OriginalMessageSize) -
3687                 server->vals->read_rsp_size;
3688         npages = DIV_ROUND_UP(len, PAGE_SIZE);
3689 
3690         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
3691         if (!pages) {
3692                 rc = -ENOMEM;
3693                 goto discard_data;
3694         }
3695 
3696         for (; i < npages; i++) {
3697                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
3698                 if (!pages[i]) {
3699                         rc = -ENOMEM;
3700                         goto discard_data;
3701                 }
3702         }
3703 
3704         /* read read data into pages */
3705         rc = read_data_into_pages(server, pages, npages, len);
3706         if (rc)
3707                 goto free_pages;
3708 
3709         rc = cifs_discard_remaining_data(server);
3710         if (rc)
3711                 goto free_pages;
3712 
3713         rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size,
3714                               pages, npages, len);
3715         if (rc)
3716                 goto free_pages;
3717 
3718         *mid = smb2_find_mid(server, buf);
3719         if (*mid == NULL)
3720                 cifs_dbg(FYI, "mid not found\n");
3721         else {
3722                 cifs_dbg(FYI, "mid found\n");
3723                 (*mid)->decrypted = true;
3724                 rc = handle_read_data(server, *mid, buf,
3725                                       server->vals->read_rsp_size,
3726                                       pages, npages, len);
3727         }
3728 
3729 free_pages:
3730         for (i = i - 1; i >= 0; i--)
3731                 put_page(pages[i]);
3732         kfree(pages);
3733         return rc;
3734 discard_data:
3735         cifs_discard_remaining_data(server);
3736         goto free_pages;
3737 }
3738 
3739 static int
3740 receive_encrypted_standard(struct TCP_Server_Info *server,
3741                            struct mid_q_entry **mids, char **bufs,
3742                            int *num_mids)
3743 {
3744         int ret, length;
3745         char *buf = server->smallbuf;
3746         char *tmpbuf;
3747         struct smb2_sync_hdr *shdr;
3748         unsigned int pdu_length = server->pdu_size;
3749         unsigned int buf_size;
3750         struct mid_q_entry *mid_entry;
3751         int next_is_large;
3752         char *next_buffer = NULL;
3753 
3754         *num_mids = 0;
3755 
3756         /* switch to large buffer if too big for a small one */
3757         if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE) {
3758                 server->large_buf = true;
3759                 memcpy(server->bigbuf, buf, server->total_read);
3760                 buf = server->bigbuf;
3761         }
3762 
3763         /* now read the rest */
3764         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
3765                                 pdu_length - HEADER_SIZE(server) + 1);
3766         if (length < 0)
3767                 return length;
3768         server->total_read += length;
3769 
3770         buf_size = pdu_length - sizeof(struct smb2_transform_hdr);
3771         length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0);
3772         if (length)
3773                 return length;
3774 
3775         next_is_large = server->large_buf;
3776  one_more:
3777         shdr = (struct smb2_sync_hdr *)buf;
3778         if (shdr->NextCommand) {
3779                 if (next_is_large) {
3780                         tmpbuf = server->bigbuf;
3781                         next_buffer = (char *)cifs_buf_get();
3782                 } else {
3783                         tmpbuf = server->smallbuf;
3784                         next_buffer = (char *)cifs_small_buf_get();
3785                 }
3786                 memcpy(next_buffer,
3787                        tmpbuf + le32_to_cpu(shdr->NextCommand),
3788                        pdu_length - le32_to_cpu(shdr->NextCommand));
3789         }
3790 
3791         mid_entry = smb2_find_mid(server, buf);
3792         if (mid_entry == NULL)
3793                 cifs_dbg(FYI, "mid not found\n");
3794         else {
3795                 cifs_dbg(FYI, "mid found\n");
3796                 mid_entry->decrypted = true;
3797                 mid_entry->resp_buf_size = server->pdu_size;
3798         }
3799 
3800         if (*num_mids >= MAX_COMPOUND) {
3801                 cifs_dbg(VFS, "too many PDUs in compound\n");
3802                 return -1;
3803         }
3804         bufs[*num_mids] = buf;
3805         mids[(*num_mids)++] = mid_entry;
3806 
3807         if (mid_entry && mid_entry->handle)
3808                 ret = mid_entry->handle(server, mid_entry);
3809         else
3810                 ret = cifs_handle_standard(server, mid_entry);
3811 
3812         if (ret == 0 && shdr->NextCommand) {
3813                 pdu_length -= le32_to_cpu(shdr->NextCommand);
3814                 server->large_buf = next_is_large;
3815                 if (next_is_large)
3816                         server->bigbuf = next_buffer;
3817                 else
3818                         server->smallbuf = next_buffer;
3819 
3820                 buf += le32_to_cpu(shdr->NextCommand);
3821                 goto one_more;
3822         }
3823 
3824         return ret;
3825 }
3826 
3827 static int
3828 smb3_receive_transform(struct TCP_Server_Info *server,
3829                        struct mid_q_entry **mids, char **bufs, int *num_mids)
3830 {
3831         char *buf = server->smallbuf;
3832         unsigned int pdu_length = server->pdu_size;
3833         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
3834         unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
3835 
3836         if (pdu_length < sizeof(struct smb2_transform_hdr) +
3837                                                 sizeof(struct smb2_sync_hdr)) {
3838                 cifs_dbg(VFS, "Transform message is too small (%u)\n",
3839                          pdu_length);
3840                 cifs_reconnect(server);
3841                 wake_up(&server->response_q);
3842                 return -ECONNABORTED;
3843         }
3844 
3845         if (pdu_length < orig_len + sizeof(struct smb2_transform_hdr)) {
3846                 cifs_dbg(VFS, "Transform message is broken\n");
3847                 cifs_reconnect(server);
3848                 wake_up(&server->response_q);
3849                 return -ECONNABORTED;
3850         }
3851 
3852         /* TODO: add support for compounds containing READ. */
3853         if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) {
3854                 *num_mids = 1;
3855                 return receive_encrypted_read(server, &mids[0]);
3856         }
3857 
3858         return receive_encrypted_standard(server, mids, bufs, num_mids);
3859 }
3860 
3861 int
3862 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
3863 {
3864         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
3865 
3866         return handle_read_data(server, mid, buf, server->pdu_size,
3867                                 NULL, 0, 0);
3868 }
3869 
3870 static int
3871 smb2_next_header(char *buf)
3872 {
3873         struct smb2_sync_hdr *hdr = (struct smb2_sync_hdr *)buf;
3874         struct smb2_transform_hdr *t_hdr = (struct smb2_transform_hdr *)buf;
3875 
3876         if (hdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM)
3877                 return sizeof(struct smb2_transform_hdr) +
3878                   le32_to_cpu(t_hdr->OriginalMessageSize);
3879 
3880         return le32_to_cpu(hdr->NextCommand);
3881 }
3882 
3883 static int
3884 smb2_make_node(unsigned int xid, struct inode *inode,
3885                struct dentry *dentry, struct cifs_tcon *tcon,
3886                char *full_path, umode_t mode, dev_t dev)
3887 {
3888         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
3889         int rc = -EPERM;
3890         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
3891         FILE_ALL_INFO *buf = NULL;
3892         struct cifs_io_parms io_parms;
3893         __u32 oplock = 0;
3894         struct cifs_fid fid;
3895         struct cifs_open_parms oparms;
3896         unsigned int bytes_written;
3897         struct win_dev *pdev;
3898         struct kvec iov[2];
3899 
3900         /*
3901          * Check if mounted with mount parm 'sfu' mount parm.
3902          * SFU emulation should work with all servers, but only
3903          * supports block and char device (no socket & fifo),
3904          * and was used by default in earlier versions of Windows
3905          */
3906         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
3907                 goto out;
3908 
3909         /*
3910          * TODO: Add ability to create instead via reparse point. Windows (e.g.
3911          * their current NFS server) uses this approach to expose special files
3912          * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions
3913          */
3914 
3915         if (!S_ISCHR(mode) && !S_ISBLK(mode))
3916                 goto out;
3917 
3918         cifs_dbg(FYI, "sfu compat create special file\n");
3919 
3920         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
3921         if (buf == NULL) {
3922                 rc = -ENOMEM;
3923                 goto out;
3924         }
3925 
3926         if (backup_cred(cifs_sb))
3927                 create_options |= CREATE_OPEN_BACKUP_INTENT;
3928 
3929         oparms.tcon = tcon;
3930         oparms.cifs_sb = cifs_sb;
3931         oparms.desired_access = GENERIC_WRITE;
3932         oparms.create_options = create_options;
3933         oparms.disposition = FILE_CREATE;
3934         oparms.path = full_path;
3935         oparms.fid = &fid;
3936         oparms.reconnect = false;
3937 
3938         if (tcon->ses->server->oplocks)
3939                 oplock = REQ_OPLOCK;
3940         else
3941                 oplock = 0;
3942         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
3943         if (rc)
3944                 goto out;
3945 
3946         /*
3947          * BB Do not bother to decode buf since no local inode yet to put
3948          * timestamps in, but we can reuse it safely.
3949          */
3950 
3951         pdev = (struct win_dev *)buf;
3952         io_parms.pid = current->tgid;
3953         io_parms.tcon = tcon;
3954         io_parms.offset = 0;
3955         io_parms.length = sizeof(struct win_dev);
3956         iov[1].iov_base = buf;
3957         iov[1].iov_len = sizeof(struct win_dev);
3958         if (S_ISCHR(mode)) {
3959                 memcpy(pdev->type, "IntxCHR", 8);
3960                 pdev->major = cpu_to_le64(MAJOR(dev));
3961                 pdev->minor = cpu_to_le64(MINOR(dev));
3962                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
3963                                                         &bytes_written, iov, 1);
3964         } else if (S_ISBLK(mode)) {
3965                 memcpy(pdev->type, "IntxBLK", 8);
3966                 pdev->major = cpu_to_le64(MAJOR(dev));
3967                 pdev->minor = cpu_to_le64(MINOR(dev));
3968                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
3969                                                         &bytes_written, iov, 1);
3970         }
3971         tcon->ses->server->ops->close(xid, tcon, &fid);
3972         d_drop(dentry);
3973 
3974         /* FIXME: add code here to set EAs */
3975 out:
3976         kfree(buf);
3977         return rc;
3978 }
3979 
3980 
3981 struct smb_version_operations smb20_operations = {
3982         .compare_fids = smb2_compare_fids,
3983         .setup_request = smb2_setup_request,
3984         .setup_async_request = smb2_setup_async_request,
3985         .check_receive = smb2_check_receive,
3986         .add_credits = smb2_add_credits,
3987         .set_credits = smb2_set_credits,
3988         .get_credits_field = smb2_get_credits_field,
3989         .get_credits = smb2_get_credits,
3990         .wait_mtu_credits = cifs_wait_mtu_credits,
3991         .get_next_mid = smb2_get_next_mid,
3992         .revert_current_mid = smb2_revert_current_mid,
3993         .read_data_offset = smb2_read_data_offset,
3994         .read_data_length = smb2_read_data_length,
3995         .map_error = map_smb2_to_linux_error,
3996         .find_mid = smb2_find_mid,
3997         .check_message = smb2_check_message,
3998         .dump_detail = smb2_dump_detail,
3999         .clear_stats = smb2_clear_stats,
4000         .print_stats = smb2_print_stats,
4001         .is_oplock_break = smb2_is_valid_oplock_break,
4002         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4003         .downgrade_oplock = smb2_downgrade_oplock,
4004         .need_neg = smb2_need_neg,
4005         .negotiate = smb2_negotiate,
4006         .negotiate_wsize = smb2_negotiate_wsize,
4007         .negotiate_rsize = smb2_negotiate_rsize,
4008         .sess_setup = SMB2_sess_setup,
4009         .logoff = SMB2_logoff,
4010         .tree_connect = SMB2_tcon,
4011         .tree_disconnect = SMB2_tdis,
4012         .qfs_tcon = smb2_qfs_tcon,
4013         .is_path_accessible = smb2_is_path_accessible,
4014         .can_echo = smb2_can_echo,
4015         .echo = SMB2_echo,
4016         .query_path_info = smb2_query_path_info,
4017         .get_srv_inum = smb2_get_srv_inum,
4018         .query_file_info = smb2_query_file_info,
4019         .set_path_size = smb2_set_path_size,
4020         .set_file_size = smb2_set_file_size,
4021         .set_file_info = smb2_set_file_info,
4022         .set_compression = smb2_set_compression,
4023         .mkdir = smb2_mkdir,
4024         .mkdir_setinfo = smb2_mkdir_setinfo,
4025         .rmdir = smb2_rmdir,
4026         .unlink = smb2_unlink,
4027         .rename = smb2_rename_path,
4028         .create_hardlink = smb2_create_hardlink,
4029         .query_symlink = smb2_query_symlink,
4030         .query_mf_symlink = smb3_query_mf_symlink,
4031         .create_mf_symlink = smb3_create_mf_symlink,
4032         .open = smb2_open_file,
4033         .set_fid = smb2_set_fid,
4034         .close = smb2_close_file,
4035         .flush = smb2_flush_file,
4036         .async_readv = smb2_async_readv,
4037         .async_writev = smb2_async_writev,
4038         .sync_read = smb2_sync_read,
4039         .sync_write = smb2_sync_write,
4040         .query_dir_first = smb2_query_dir_first,
4041         .query_dir_next = smb2_query_dir_next,
4042         .close_dir = smb2_close_dir,
4043         .calc_smb_size = smb2_calc_size,
4044         .is_status_pending = smb2_is_status_pending,
4045         .is_session_expired = smb2_is_session_expired,
4046         .oplock_response = smb2_oplock_response,
4047         .queryfs = smb2_queryfs,
4048         .mand_lock = smb2_mand_lock,
4049         .mand_unlock_range = smb2_unlock_range,
4050         .push_mand_locks = smb2_push_mandatory_locks,
4051         .get_lease_key = smb2_get_lease_key,
4052         .set_lease_key = smb2_set_lease_key,
4053         .new_lease_key = smb2_new_lease_key,
4054         .calc_signature = smb2_calc_signature,
4055         .is_read_op = smb2_is_read_op,
4056         .set_oplock_level = smb2_set_oplock_level,
4057         .create_lease_buf = smb2_create_lease_buf,
4058         .parse_lease_buf = smb2_parse_lease_buf,
4059         .copychunk_range = smb2_copychunk_range,
4060         .wp_retry_size = smb2_wp_retry_size,
4061         .dir_needs_close = smb2_dir_needs_close,
4062         .get_dfs_refer = smb2_get_dfs_refer,
4063         .select_sectype = smb2_select_sectype,
4064 #ifdef CONFIG_CIFS_XATTR
4065         .query_all_EAs = smb2_query_eas,
4066         .set_EA = smb2_set_ea,
4067 #endif /* CIFS_XATTR */
4068 #ifdef CONFIG_CIFS_ACL
4069         .get_acl = get_smb2_acl,
4070         .get_acl_by_fid = get_smb2_acl_by_fid,
4071         .set_acl = set_smb2_acl,
4072 #endif /* CIFS_ACL */
4073         .next_header = smb2_next_header,
4074         .ioctl_query_info = smb2_ioctl_query_info,
4075         .make_node = smb2_make_node,
4076 };
4077 
4078 struct smb_version_operations smb21_operations = {
4079         .compare_fids = smb2_compare_fids,
4080         .setup_request = smb2_setup_request,
4081         .setup_async_request = smb2_setup_async_request,
4082         .check_receive = smb2_check_receive,
4083         .add_credits = smb2_add_credits,
4084         .set_credits = smb2_set_credits,
4085         .get_credits_field = smb2_get_credits_field,
4086         .get_credits = smb2_get_credits,
4087         .wait_mtu_credits = smb2_wait_mtu_credits,
4088         .adjust_credits = smb2_adjust_credits,
4089         .get_next_mid = smb2_get_next_mid,
4090         .revert_current_mid = smb2_revert_current_mid,
4091         .read_data_offset = smb2_read_data_offset,
4092         .read_data_length = smb2_read_data_length,
4093         .map_error = map_smb2_to_linux_error,
4094         .find_mid = smb2_find_mid,
4095         .check_message = smb2_check_message,
4096         .dump_detail = smb2_dump_detail,
4097         .clear_stats = smb2_clear_stats,
4098         .print_stats = smb2_print_stats,
4099         .is_oplock_break = smb2_is_valid_oplock_break,
4100         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4101         .downgrade_oplock = smb21_downgrade_oplock,
4102         .need_neg = smb2_need_neg,
4103         .negotiate = smb2_negotiate,
4104         .negotiate_wsize = smb2_negotiate_wsize,
4105         .negotiate_rsize = smb2_negotiate_rsize,
4106         .sess_setup = SMB2_sess_setup,
4107         .logoff = SMB2_logoff,
4108         .tree_connect = SMB2_tcon,
4109         .tree_disconnect = SMB2_tdis,
4110         .qfs_tcon = smb2_qfs_tcon,
4111         .is_path_accessible = smb2_is_path_accessible,
4112         .can_echo = smb2_can_echo,
4113         .echo = SMB2_echo,
4114         .query_path_info = smb2_query_path_info,
4115         .get_srv_inum = smb2_get_srv_inum,
4116         .query_file_info = smb2_query_file_info,
4117         .set_path_size = smb2_set_path_size,
4118         .set_file_size = smb2_set_file_size,
4119         .set_file_info = smb2_set_file_info,
4120         .set_compression = smb2_set_compression,
4121         .mkdir = smb2_mkdir,
4122         .mkdir_setinfo = smb2_mkdir_setinfo,
4123         .rmdir = smb2_rmdir,
4124         .unlink = smb2_unlink,
4125         .rename = smb2_rename_path,
4126         .create_hardlink = smb2_create_hardlink,
4127         .query_symlink = smb2_query_symlink,
4128         .query_mf_symlink = smb3_query_mf_symlink,
4129         .create_mf_symlink = smb3_create_mf_symlink,
4130         .open = smb2_open_file,
4131         .set_fid = smb2_set_fid,
4132         .close = smb2_close_file,
4133         .flush = smb2_flush_file,
4134         .async_readv = smb2_async_readv,
4135         .async_writev = smb2_async_writev,
4136         .sync_read = smb2_sync_read,
4137         .sync_write = smb2_sync_write,
4138         .query_dir_first = smb2_query_dir_first,
4139         .query_dir_next = smb2_query_dir_next,
4140         .close_dir = smb2_close_dir,
4141         .calc_smb_size = smb2_calc_size,
4142         .is_status_pending = smb2_is_status_pending,
4143         .is_session_expired = smb2_is_session_expired,
4144         .oplock_response = smb2_oplock_response,
4145         .queryfs = smb2_queryfs,
4146         .mand_lock = smb2_mand_lock,
4147         .mand_unlock_range = smb2_unlock_range,
4148         .push_mand_locks = smb2_push_mandatory_locks,
4149         .get_lease_key = smb2_get_lease_key,
4150         .set_lease_key = smb2_set_lease_key,
4151         .new_lease_key = smb2_new_lease_key,
4152         .calc_signature = smb2_calc_signature,
4153         .is_read_op = smb21_is_read_op,
4154         .set_oplock_level = smb21_set_oplock_level,
4155         .create_lease_buf = smb2_create_lease_buf,
4156         .parse_lease_buf = smb2_parse_lease_buf,
4157         .copychunk_range = smb2_copychunk_range,
4158         .wp_retry_size = smb2_wp_retry_size,
4159         .dir_needs_close = smb2_dir_needs_close,
4160         .enum_snapshots = smb3_enum_snapshots,
4161         .get_dfs_refer = smb2_get_dfs_refer,
4162         .select_sectype = smb2_select_sectype,
4163 #ifdef CONFIG_CIFS_XATTR
4164         .query_all_EAs = smb2_query_eas,
4165         .set_EA = smb2_set_ea,
4166 #endif /* CIFS_XATTR */
4167 #ifdef CONFIG_CIFS_ACL
4168         .get_acl = get_smb2_acl,
4169         .get_acl_by_fid = get_smb2_acl_by_fid,
4170         .set_acl = set_smb2_acl,
4171 #endif /* CIFS_ACL */
4172         .next_header = smb2_next_header,
4173         .ioctl_query_info = smb2_ioctl_query_info,
4174         .make_node = smb2_make_node,
4175 };
4176 
4177 struct smb_version_operations smb30_operations = {
4178         .compare_fids = smb2_compare_fids,
4179         .setup_request = smb2_setup_request,
4180         .setup_async_request = smb2_setup_async_request,
4181         .check_receive = smb2_check_receive,
4182         .add_credits = smb2_add_credits,
4183         .set_credits = smb2_set_credits,
4184         .get_credits_field = smb2_get_credits_field,
4185         .get_credits = smb2_get_credits,
4186         .wait_mtu_credits = smb2_wait_mtu_credits,
4187         .adjust_credits = smb2_adjust_credits,
4188         .get_next_mid = smb2_get_next_mid,
4189         .revert_current_mid = smb2_revert_current_mid,
4190         .read_data_offset = smb2_read_data_offset,
4191         .read_data_length = smb2_read_data_length,
4192         .map_error = map_smb2_to_linux_error,
4193         .find_mid = smb2_find_mid,
4194         .check_message = smb2_check_message,
4195         .dump_detail = smb2_dump_detail,
4196         .clear_stats = smb2_clear_stats,
4197         .print_stats = smb2_print_stats,
4198         .dump_share_caps = smb2_dump_share_caps,
4199         .is_oplock_break = smb2_is_valid_oplock_break,
4200         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4201         .downgrade_oplock = smb21_downgrade_oplock,
4202         .need_neg = smb2_need_neg,
4203         .negotiate = smb2_negotiate,
4204         .negotiate_wsize = smb3_negotiate_wsize,
4205         .negotiate_rsize = smb3_negotiate_rsize,
4206         .sess_setup = SMB2_sess_setup,
4207         .logoff = SMB2_logoff,
4208         .tree_connect = SMB2_tcon,
4209         .tree_disconnect = SMB2_tdis,
4210         .qfs_tcon = smb3_qfs_tcon,
4211         .is_path_accessible = smb2_is_path_accessible,
4212         .can_echo = smb2_can_echo,
4213         .echo = SMB2_echo,
4214         .query_path_info = smb2_query_path_info,
4215         .get_srv_inum = smb2_get_srv_inum,
4216         .query_file_info = smb2_query_file_info,
4217         .set_path_size = smb2_set_path_size,
4218         .set_file_size = smb2_set_file_size,
4219         .set_file_info = smb2_set_file_info,
4220         .set_compression = smb2_set_compression,
4221         .mkdir = smb2_mkdir,
4222         .mkdir_setinfo = smb2_mkdir_setinfo,
4223         .rmdir = smb2_rmdir,
4224         .unlink = smb2_unlink,
4225         .rename = smb2_rename_path,
4226         .create_hardlink = smb2_create_hardlink,
4227         .query_symlink = smb2_query_symlink,
4228         .query_mf_symlink = smb3_query_mf_symlink,
4229         .create_mf_symlink = smb3_create_mf_symlink,
4230         .open = smb2_open_file,
4231         .set_fid = smb2_set_fid,
4232         .close = smb2_close_file,
4233         .flush = smb2_flush_file,
4234         .async_readv = smb2_async_readv,
4235         .async_writev = smb2_async_writev,
4236         .sync_read = smb2_sync_read,
4237         .sync_write = smb2_sync_write,
4238         .query_dir_first = smb2_query_dir_first,
4239         .query_dir_next = smb2_query_dir_next,
4240         .close_dir = smb2_close_dir,
4241         .calc_smb_size = smb2_calc_size,
4242         .is_status_pending = smb2_is_status_pending,
4243         .is_session_expired = smb2_is_session_expired,
4244         .oplock_response = smb2_oplock_response,
4245         .queryfs = smb2_queryfs,
4246         .mand_lock = smb2_mand_lock,
4247         .mand_unlock_range = smb2_unlock_range,
4248         .push_mand_locks = smb2_push_mandatory_locks,
4249         .get_lease_key = smb2_get_lease_key,
4250         .set_lease_key = smb2_set_lease_key,
4251         .new_lease_key = smb2_new_lease_key,
4252         .generate_signingkey = generate_smb30signingkey,
4253         .calc_signature = smb3_calc_signature,
4254         .set_integrity  = smb3_set_integrity,
4255         .is_read_op = smb21_is_read_op,
4256         .set_oplock_level = smb3_set_oplock_level,
4257         .create_lease_buf = smb3_create_lease_buf,
4258         .parse_lease_buf = smb3_parse_lease_buf,
4259         .copychunk_range = smb2_copychunk_range,
4260         .duplicate_extents = smb2_duplicate_extents,
4261         .validate_negotiate = smb3_validate_negotiate,
4262         .wp_retry_size = smb2_wp_retry_size,
4263         .dir_needs_close = smb2_dir_needs_close,
4264         .fallocate = smb3_fallocate,
4265         .enum_snapshots = smb3_enum_snapshots,
4266         .init_transform_rq = smb3_init_transform_rq,
4267         .is_transform_hdr = smb3_is_transform_hdr,
4268         .receive_transform = smb3_receive_transform,
4269         .get_dfs_refer = smb2_get_dfs_refer,
4270         .select_sectype = smb2_select_sectype,
4271 #ifdef CONFIG_CIFS_XATTR
4272         .query_all_EAs = smb2_query_eas,
4273         .set_EA = smb2_set_ea,
4274 #endif /* CIFS_XATTR */
4275 #ifdef CONFIG_CIFS_ACL
4276         .get_acl = get_smb2_acl,
4277         .get_acl_by_fid = get_smb2_acl_by_fid,
4278         .set_acl = set_smb2_acl,
4279 #endif /* CIFS_ACL */
4280         .next_header = smb2_next_header,
4281         .ioctl_query_info = smb2_ioctl_query_info,
4282         .make_node = smb2_make_node,
4283 };
4284 
4285 struct smb_version_operations smb311_operations = {
4286         .compare_fids = smb2_compare_fids,
4287         .setup_request = smb2_setup_request,
4288         .setup_async_request = smb2_setup_async_request,
4289         .check_receive = smb2_check_receive,
4290         .add_credits = smb2_add_credits,
4291         .set_credits = smb2_set_credits,
4292         .get_credits_field = smb2_get_credits_field,
4293         .get_credits = smb2_get_credits,
4294         .wait_mtu_credits = smb2_wait_mtu_credits,
4295         .adjust_credits = smb2_adjust_credits,
4296         .get_next_mid = smb2_get_next_mid,
4297         .revert_current_mid = smb2_revert_current_mid,
4298         .read_data_offset = smb2_read_data_offset,
4299         .read_data_length = smb2_read_data_length,
4300         .map_error = map_smb2_to_linux_error,
4301         .find_mid = smb2_find_mid,
4302         .check_message = smb2_check_message,
4303         .dump_detail = smb2_dump_detail,
4304         .clear_stats = smb2_clear_stats,
4305         .print_stats = smb2_print_stats,
4306         .dump_share_caps = smb2_dump_share_caps,
4307         .is_oplock_break = smb2_is_valid_oplock_break,
4308         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4309         .downgrade_oplock = smb21_downgrade_oplock,
4310         .need_neg = smb2_need_neg,
4311         .negotiate = smb2_negotiate,
4312         .negotiate_wsize = smb3_negotiate_wsize,
4313         .negotiate_rsize = smb3_negotiate_rsize,
4314         .sess_setup = SMB2_sess_setup,
4315         .logoff = SMB2_logoff,
4316         .tree_connect = SMB2_tcon,
4317         .tree_disconnect = SMB2_tdis,
4318         .qfs_tcon = smb3_qfs_tcon,
4319         .is_path_accessible = smb2_is_path_accessible,
4320         .can_echo = smb2_can_echo,
4321         .echo = SMB2_echo,
4322         .query_path_info = smb2_query_path_info,
4323         .get_srv_inum = smb2_get_srv_inum,
4324         .query_file_info = smb2_query_file_info,
4325         .set_path_size = smb2_set_path_size,
4326         .set_file_size = smb2_set_file_size,
4327         .set_file_info = smb2_set_file_info,
4328         .set_compression = smb2_set_compression,
4329         .mkdir = smb2_mkdir,
4330         .mkdir_setinfo = smb2_mkdir_setinfo,
4331         .posix_mkdir = smb311_posix_mkdir,
4332         .rmdir = smb2_rmdir,
4333         .unlink = smb2_unlink,
4334         .rename = smb2_rename_path,
4335         .create_hardlink = smb2_create_hardlink,
4336         .query_symlink = smb2_query_symlink,
4337         .query_mf_symlink = smb3_query_mf_symlink,
4338         .create_mf_symlink = smb3_create_mf_symlink,
4339         .open = smb2_open_file,
4340         .set_fid = smb2_set_fid,
4341         .close = smb2_close_file,
4342         .flush = smb2_flush_file,
4343         .async_readv = smb2_async_readv,
4344         .async_writev = smb2_async_writev,
4345         .sync_read = smb2_sync_read,
4346         .sync_write = smb2_sync_write,
4347         .query_dir_first = smb2_query_dir_first,
4348         .query_dir_next = smb2_query_dir_next,
4349         .close_dir = smb2_close_dir,
4350         .calc_smb_size = smb2_calc_size,
4351         .is_status_pending = smb2_is_status_pending,
4352         .is_session_expired = smb2_is_session_expired,
4353         .oplock_response = smb2_oplock_response,
4354         .queryfs = smb311_queryfs,
4355         .mand_lock = smb2_mand_lock,
4356         .mand_unlock_range = smb2_unlock_range,
4357         .push_mand_locks = smb2_push_mandatory_locks,
4358         .get_lease_key = smb2_get_lease_key,
4359         .set_lease_key = smb2_set_lease_key,
4360         .new_lease_key = smb2_new_lease_key,
4361         .generate_signingkey = generate_smb311signingkey,
4362         .calc_signature = smb3_calc_signature,
4363         .set_integrity  = smb3_set_integrity,
4364         .is_read_op = smb21_is_read_op,
4365         .set_oplock_level = smb3_set_oplock_level,
4366         .create_lease_buf = smb3_create_lease_buf,
4367         .parse_lease_buf = smb3_parse_lease_buf,
4368         .copychunk_range = smb2_copychunk_range,
4369         .duplicate_extents = smb2_duplicate_extents,
4370 /*      .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
4371         .wp_retry_size = smb2_wp_retry_size,
4372         .dir_needs_close = smb2_dir_needs_close,
4373         .fallocate = smb3_fallocate,
4374         .enum_snapshots = smb3_enum_snapshots,
4375         .init_transform_rq = smb3_init_transform_rq,
4376         .is_transform_hdr = smb3_is_transform_hdr,
4377         .receive_transform = smb3_receive_transform,
4378         .get_dfs_refer = smb2_get_dfs_refer,
4379         .select_sectype = smb2_select_sectype,
4380 #ifdef CONFIG_CIFS_XATTR
4381         .query_all_EAs = smb2_query_eas,
4382         .set_EA = smb2_set_ea,
4383 #endif /* CIFS_XATTR */
4384 #ifdef CONFIG_CIFS_ACL
4385         .get_acl = get_smb2_acl,
4386         .get_acl_by_fid = get_smb2_acl_by_fid,
4387         .set_acl = set_smb2_acl,
4388 #endif /* CIFS_ACL */
4389         .next_header = smb2_next_header,
4390         .ioctl_query_info = smb2_ioctl_query_info,
4391         .make_node = smb2_make_node,
4392 };
4393 
4394 struct smb_version_values smb20_values = {
4395         .version_string = SMB20_VERSION_STRING,
4396         .protocol_id = SMB20_PROT_ID,
4397         .req_capabilities = 0, /* MBZ */
4398         .large_lock_type = 0,
4399         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4400         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4401         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4402         .header_size = sizeof(struct smb2_sync_hdr),
4403         .header_preamble_size = 0,
4404         .max_header_size = MAX_SMB2_HDR_SIZE,
4405         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4406         .lock_cmd = SMB2_LOCK,
4407         .cap_unix = 0,
4408         .cap_nt_find = SMB2_NT_FIND,
4409         .cap_large_files = SMB2_LARGE_FILES,
4410         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4411         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4412         .create_lease_size = sizeof(struct create_lease),
4413 };
4414 
4415 struct smb_version_values smb21_values = {
4416         .version_string = SMB21_VERSION_STRING,
4417         .protocol_id = SMB21_PROT_ID,
4418         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
4419         .large_lock_type = 0,
4420         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4421         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4422         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4423         .header_size = sizeof(struct smb2_sync_hdr),
4424         .header_preamble_size = 0,
4425         .max_header_size = MAX_SMB2_HDR_SIZE,
4426         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4427         .lock_cmd = SMB2_LOCK,
4428         .cap_unix = 0,
4429         .cap_nt_find = SMB2_NT_FIND,
4430         .cap_large_files = SMB2_LARGE_FILES,
4431         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4432         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4433         .create_lease_size = sizeof(struct create_lease),
4434 };
4435 
4436 struct smb_version_values smb3any_values = {
4437         .version_string = SMB3ANY_VERSION_STRING,
4438         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
4439         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
4440         .large_lock_type = 0,
4441         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4442         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4443         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4444         .header_size = sizeof(struct smb2_sync_hdr),
4445         .header_preamble_size = 0,
4446         .max_header_size = MAX_SMB2_HDR_SIZE,
4447         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4448         .lock_cmd = SMB2_LOCK,
4449         .cap_unix = 0,
4450         .cap_nt_find = SMB2_NT_FIND,
4451         .cap_large_files = SMB2_LARGE_FILES,
4452         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4453         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4454         .create_lease_size = sizeof(struct create_lease_v2),
4455 };
4456 
4457 struct smb_version_values smbdefault_values = {
4458         .version_string = SMBDEFAULT_VERSION_STRING,
4459         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
4460         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
4461         .large_lock_type = 0,
4462         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4463         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4464         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4465         .header_size = sizeof(struct smb2_sync_hdr),
4466         .header_preamble_size = 0,
4467         .max_header_size = MAX_SMB2_HDR_SIZE,
4468         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4469         .lock_cmd = SMB2_LOCK,
4470         .cap_unix = 0,
4471         .cap_nt_find = SMB2_NT_FIND,
4472         .cap_large_files = SMB2_LARGE_FILES,
4473         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4474         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4475         .create_lease_size = sizeof(struct create_lease_v2),
4476 };
4477 
4478 struct smb_version_values smb30_values = {
4479         .version_string = SMB30_VERSION_STRING,
4480         .protocol_id = SMB30_PROT_ID,
4481         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
4482         .large_lock_type = 0,
4483         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4484         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4485         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4486         .header_size = sizeof(struct smb2_sync_hdr),
4487         .header_preamble_size = 0,
4488         .max_header_size = MAX_SMB2_HDR_SIZE,
4489         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4490         .lock_cmd = SMB2_LOCK,
4491         .cap_unix = 0,
4492         .cap_nt_find = SMB2_NT_FIND,
4493         .cap_large_files = SMB2_LARGE_FILES,
4494         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4495         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4496         .create_lease_size = sizeof(struct create_lease_v2),
4497 };
4498 
4499 struct smb_version_values smb302_values = {
4500         .version_string = SMB302_VERSION_STRING,
4501         .protocol_id = SMB302_PROT_ID,
4502         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
4503         .large_lock_type = 0,
4504         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4505         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4506         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4507         .header_size = sizeof(struct smb2_sync_hdr),
4508         .header_preamble_size = 0,
4509         .max_header_size = MAX_SMB2_HDR_SIZE,
4510         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4511         .lock_cmd = SMB2_LOCK,
4512         .cap_unix = 0,
4513         .cap_nt_find = SMB2_NT_FIND,
4514         .cap_large_files = SMB2_LARGE_FILES,
4515         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4516         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4517         .create_lease_size = sizeof(struct create_lease_v2),
4518 };
4519 
4520 struct smb_version_values smb311_values = {
4521         .version_string = SMB311_VERSION_STRING,
4522         .protocol_id = SMB311_PROT_ID,
4523         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
4524         .large_lock_type = 0,
4525         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4526         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4527         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4528         .header_size = sizeof(struct smb2_sync_hdr),
4529         .header_preamble_size = 0,
4530         .max_header_size = MAX_SMB2_HDR_SIZE,
4531         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4532         .lock_cmd = SMB2_LOCK,
4533         .cap_unix = 0,
4534         .cap_nt_find = SMB2_NT_FIND,
4535         .cap_large_files = SMB2_LARGE_FILES,
4536         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4537         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4538         .create_lease_size = sizeof(struct create_lease_v2),
4539 };
4540 

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