fs/cifs/smb2ops.c

   1 /*
   2  *  SMB2 version specific operations
   3  *
   4  *  Copyright (c) 2012, Jeff Layton <[email protected]>
   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
  36 static int
  37 change_conf(struct TCP_Server_Info *server)
  38 {
  39         server->credits += server->echo_credits + server->oplock_credits;
  40         server->oplock_credits = server->echo_credits = 0;
  41         switch (server->credits) {
  42         case 0:
  43                 return -1;
  44         case 1:
  45                 server->echoes = false;
  46                 server->oplocks = false;
  47                 cifs_dbg(VFS, "disabling echoes and oplocks\n");
  48                 break;
  49         case 2:
  50                 server->echoes = true;
  51                 server->oplocks = false;
  52                 server->echo_credits = 1;
  53                 cifs_dbg(FYI, "disabling oplocks\n");
  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 0;
  67 }
  68
  69 static void
  70 smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
  71                  const int optype)
  72 {
  73         int *val, rc = 0;
  74         spin_lock(&server->req_lock);
  75         val = server->ops->get_credits_field(server, optype);
  76         *val += add;
  77         if (*val > 65000) {
  78                 *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
  79                 printk_once(KERN_WARNING "server overflowed SMB3 credits\n");
  80         }
  81         server->in_flight--;
  82         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
  83                 rc = change_conf(server);
  84         /*
  85          * Sometimes server returns 0 credits on oplock break ack - we need to
  86          * rebalance credits in this case.
  87          */
  88         else if (server->in_flight > 0 && server->oplock_credits == 0 &&
  89                  server->oplocks) {
  90                 if (server->credits > 1) {
  91                         server->credits--;
  92                         server->oplock_credits++;
  93                 }
  94         }
  95         spin_unlock(&server->req_lock);
  96         wake_up(&server->request_q);
  97         if (rc)
  98                 cifs_reconnect(server);
  99 }
 100
 101 static void
 102 smb2_set_credits(struct TCP_Server_Info *server, const int val)
 103 {
 104         spin_lock(&server->req_lock);
 105         server->credits = val;
 106         spin_unlock(&server->req_lock);
 107 }
 108
 109 static int *
 110 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
 111 {
 112         switch (optype) {
 113         case CIFS_ECHO_OP:
 114                 return &server->echo_credits;
 115         case CIFS_OBREAK_OP:
 116                 return &server->oplock_credits;
 117         default:
 118                 return &server->credits;
 119         }
 120 }
 121
 122 static unsigned int
 123 smb2_get_credits(struct mid_q_entry *mid)
 124 {
 125         struct smb2_sync_hdr *shdr = get_sync_hdr(mid->resp_buf);
 126
 127         return le16_to_cpu(shdr->CreditRequest);
 128 }
 129
 130 static int
 131 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 132                       unsigned int *num, unsigned int *credits)
 133 {
 134         int rc = 0;
 135         unsigned int scredits;
 136
 137         spin_lock(&server->req_lock);
 138         while (1) {
 139                 if (server->credits <= 0) {
 140                         spin_unlock(&server->req_lock);
 141                         cifs_num_waiters_inc(server);
 142                         rc = wait_event_killable(server->request_q,
 143                                         has_credits(server, &server->credits));
 144                         cifs_num_waiters_dec(server);
 145                         if (rc)
 146                                 return rc;
 147                         spin_lock(&server->req_lock);
 148                 } else {
 149                         if (server->tcpStatus == CifsExiting) {
 150                                 spin_unlock(&server->req_lock);
 151                                 return -ENOENT;
 152                         }
 153
 154                         scredits = server->credits;
 155                         /* can deadlock with reopen */
 156                         if (scredits == 1) {
 157                                 *num = SMB2_MAX_BUFFER_SIZE;
 158                                 *credits = 0;
 159                                 break;
 160                         }
 161
 162                         /* leave one credit for a possible reopen */
 163                         scredits--;
 164                         *num = min_t(unsigned int, size,
 165                                      scredits * SMB2_MAX_BUFFER_SIZE);
 166
 167                         *credits = DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
 168                         server->credits -= *credits;
 169                         server->in_flight++;
 170                         break;
 171                 }
 172         }
 173         spin_unlock(&server->req_lock);
 174         return rc;
 175 }
 176
 177 static __u64
 178 smb2_get_next_mid(struct TCP_Server_Info *server)
 179 {
 180         __u64 mid;
 181         /* for SMB2 we need the current value */
 182         spin_lock(&GlobalMid_Lock);
 183         mid = server->CurrentMid++;
 184         spin_unlock(&GlobalMid_Lock);
 185         return mid;
 186 }
 187
 188 static struct mid_q_entry *
 189 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 190 {
 191         struct mid_q_entry *mid;
 192         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
 193         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
 194
 195         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 196                 cifs_dbg(VFS, "encrypted frame parsing not supported yet");
 197                 return NULL;
 198         }
 199
 200         spin_lock(&GlobalMid_Lock);
 201         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 202                 if ((mid->mid == wire_mid) &&
 203                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 204                     (mid->command == shdr->Command)) {
 205                         spin_unlock(&GlobalMid_Lock);
 206                         return mid;
 207                 }
 208         }
 209         spin_unlock(&GlobalMid_Lock);
 210         return NULL;
 211 }
 212
 213 static void
 214 smb2_dump_detail(void *buf)
 215 {
 216 #ifdef CONFIG_CIFS_DEBUG2
 217         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
 218
 219         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
 220                  shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
 221                  shdr->ProcessId);
 222         cifs_dbg(VFS, "smb buf %p len %u\n", buf, smb2_calc_size(buf));
 223 #endif
 224 }
 225
 226 static bool
 227 smb2_need_neg(struct TCP_Server_Info *server)
 228 {
 229         return server->max_read == 0;
 230 }
 231
 232 static int
 233 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 234 {
 235         int rc;
 236         ses->server->CurrentMid = 0;
 237         rc = SMB2_negotiate(xid, ses);
 238         /* BB we probably don't need to retry with modern servers */
 239         if (rc == -EAGAIN)
 240                 rc = -EHOSTDOWN;
 241         return rc;
 242 }
 243
 244 static unsigned int
 245 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 246 {
 247         struct TCP_Server_Info *server = tcon->ses->server;
 248         unsigned int wsize;
 249
 250         /* start with specified wsize, or default */
 251         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
 252         wsize = min_t(unsigned int, wsize, server->max_write);
 253
 254         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 255                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 256
 257         return wsize;
 258 }
 259
 260 static unsigned int
 261 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 262 {
 263         struct TCP_Server_Info *server = tcon->ses->server;
 264         unsigned int rsize;
 265
 266         /* start with specified rsize, or default */
 267         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
 268         rsize = min_t(unsigned int, rsize, server->max_read);
 269
 270         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 271                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 272
 273         return rsize;
 274 }
 275
 276 #ifdef CONFIG_CIFS_STATS2
 277 static int
 278 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 279 {
 280         int rc;
 281         unsigned int ret_data_len = 0;
 282         struct network_interface_info_ioctl_rsp *out_buf;
 283
 284         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 285                         FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
 286                         false /* use_ipc */,
 287                         NULL /* no data input */, 0 /* no data input */,
 288                         (char **)&out_buf, &ret_data_len);
 289         if (rc != 0)
 290                 cifs_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
 291         else if (ret_data_len < sizeof(struct network_interface_info_ioctl_rsp)) {
 292                 cifs_dbg(VFS, "server returned bad net interface info buf\n");
 293                 rc = -EINVAL;
 294         } else {
 295                 /* Dump info on first interface */
 296                 cifs_dbg(FYI, "Adapter Capability 0x%x\t",
 297                         le32_to_cpu(out_buf->Capability));
 298                 cifs_dbg(FYI, "Link Speed %lld\n",
 299                         le64_to_cpu(out_buf->LinkSpeed));
 300         }
 301         kfree(out_buf);
 302         return rc;
 303 }
 304 #endif /* STATS2 */
 305
 306 static void
 307 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 308 {
 309         int rc;
 310         __le16 srch_path = 0; /* Null - open root of share */
 311         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 312         struct cifs_open_parms oparms;
 313         struct cifs_fid fid;
 314
 315         oparms.tcon = tcon;
 316         oparms.desired_access = FILE_READ_ATTRIBUTES;
 317         oparms.disposition = FILE_OPEN;
 318         oparms.create_options = 0;
 319         oparms.fid = &fid;
 320         oparms.reconnect = false;
 321
 322         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 323         if (rc)
 324                 return;
 325
 326 #ifdef CONFIG_CIFS_STATS2
 327         SMB3_request_interfaces(xid, tcon);
 328 #endif /* STATS2 */
 329
 330         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 331                         FS_ATTRIBUTE_INFORMATION);
 332         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 333                         FS_DEVICE_INFORMATION);
 334         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 335                         FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
 336         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 337         return;
 338 }
 339
 340 static void
 341 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 342 {
 343         int rc;
 344         __le16 srch_path = 0; /* Null - open root of share */
 345         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 346         struct cifs_open_parms oparms;
 347         struct cifs_fid fid;
 348
 349         oparms.tcon = tcon;
 350         oparms.desired_access = FILE_READ_ATTRIBUTES;
 351         oparms.disposition = FILE_OPEN;
 352         oparms.create_options = 0;
 353         oparms.fid = &fid;
 354         oparms.reconnect = false;
 355
 356         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 357         if (rc)
 358                 return;
 359
 360         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 361                         FS_ATTRIBUTE_INFORMATION);
 362         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 363                         FS_DEVICE_INFORMATION);
 364         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 365         return;
 366 }
 367
 368 static int
 369 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 370                         struct cifs_sb_info *cifs_sb, const char *full_path)
 371 {
 372         int rc;
 373         __le16 *utf16_path;
 374         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 375         struct cifs_open_parms oparms;
 376         struct cifs_fid fid;
 377
 378         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 379         if (!utf16_path)
 380                 return -ENOMEM;
 381
 382         oparms.tcon = tcon;
 383         oparms.desired_access = FILE_READ_ATTRIBUTES;
 384         oparms.disposition = FILE_OPEN;
 385         oparms.create_options = 0;
 386         oparms.fid = &fid;
 387         oparms.reconnect = false;
 388
 389         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 390         if (rc) {
 391                 kfree(utf16_path);
 392                 return rc;
 393         }
 394
 395         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 396         kfree(utf16_path);
 397         return rc;
 398 }
 399
 400 static int
 401 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 402                   struct cifs_sb_info *cifs_sb, const char *full_path,
 403                   u64 *uniqueid, FILE_ALL_INFO *data)
 404 {
 405         *uniqueid = le64_to_cpu(data->IndexNumber);
 406         return 0;
 407 }
 408
 409 static int
 410 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 411                      struct cifs_fid *fid, FILE_ALL_INFO *data)
 412 {
 413         int rc;
 414         struct smb2_file_all_info *smb2_data;
 415
 416         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 417                             GFP_KERNEL);
 418         if (smb2_data == NULL)
 419                 return -ENOMEM;
 420
 421         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
 422                              smb2_data);
 423         if (!rc)
 424                 move_smb2_info_to_cifs(data, smb2_data);
 425         kfree(smb2_data);
 426         return rc;
 427 }
 428
 429 #ifdef CONFIG_CIFS_XATTR
 430 static ssize_t
 431 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
 432                      struct smb2_file_full_ea_info *src, size_t src_size,
 433                      const unsigned char *ea_name)
 434 {
 435         int rc = 0;
 436         unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
 437         char *name, *value;
 438         size_t name_len, value_len, user_name_len;
 439
 440         while (src_size > 0) {
 441                 name = &src->ea_data[0];
 442                 name_len = (size_t)src->ea_name_length;
 443                 value = &src->ea_data[src->ea_name_length + 1];
 444                 value_len = (size_t)le16_to_cpu(src->ea_value_length);
 445
 446                 if (name_len == 0) {
 447                         break;
 448                 }
 449
 450                 if (src_size < 8 + name_len + 1 + value_len) {
 451                         cifs_dbg(FYI, "EA entry goes beyond length of list\n");
 452                         rc = -EIO;
 453                         goto out;
 454                 }
 455
 456                 if (ea_name) {
 457                         if (ea_name_len == name_len &&
 458                             memcmp(ea_name, name, name_len) == 0) {
 459                                 rc = value_len;
 460                                 if (dst_size == 0)
 461                                         goto out;
 462                                 if (dst_size < value_len) {
 463                                         rc = -ERANGE;
 464                                         goto out;
 465                                 }
 466                                 memcpy(dst, value, value_len);
 467                                 goto out;
 468                         }
 469                 } else {
 470                         /* 'user.' plus a terminating null */
 471                         user_name_len = 5 + 1 + name_len;
 472
 473                         rc += user_name_len;
 474
 475                         if (dst_size >= user_name_len) {
 476                                 dst_size -= user_name_len;
 477                                 memcpy(dst, "user.", 5);
 478                                 dst += 5;
 479                                 memcpy(dst, src->ea_data, name_len);
 480                                 dst += name_len;
 481                                 *dst = 0;
 482                                 ++dst;
 483                         } else if (dst_size == 0) {
 484                                 /* skip copy - calc size only */
 485                         } else {
 486                                 /* stop before overrun buffer */
 487                                 rc = -ERANGE;
 488                                 break;
 489                         }
 490                 }
 491
 492                 if (!src->next_entry_offset)
 493                         break;
 494
 495                 if (src_size < le32_to_cpu(src->next_entry_offset)) {
 496                         /* stop before overrun buffer */
 497                         rc = -ERANGE;
 498                         break;
 499                 }
 500                 src_size -= le32_to_cpu(src->next_entry_offset);
 501                 src = (void *)((char *)src +
 502                                le32_to_cpu(src->next_entry_offset));
 503         }
 504
 505         /* didn't find the named attribute */
 506         if (ea_name)
 507                 rc = -ENODATA;
 508
 509 out:
 510         return (ssize_t)rc;
 511 }
 512
 513 static ssize_t
 514 smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
 515                const unsigned char *path, const unsigned char *ea_name,
 516                char *ea_data, size_t buf_size,
 517                struct cifs_sb_info *cifs_sb)
 518 {
 519         int rc;
 520         __le16 *utf16_path;
 521         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 522         struct cifs_open_parms oparms;
 523         struct cifs_fid fid;
 524         struct smb2_file_full_ea_info *smb2_data;
 525         int ea_buf_size = SMB2_MIN_EA_BUF;
 526
 527         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 528         if (!utf16_path)
 529                 return -ENOMEM;
 530
 531         oparms.tcon = tcon;
 532         oparms.desired_access = FILE_READ_EA;
 533         oparms.disposition = FILE_OPEN;
 534         oparms.create_options = 0;
 535         oparms.fid = &fid;
 536         oparms.reconnect = false;
 537
 538         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 539         kfree(utf16_path);
 540         if (rc) {
 541                 cifs_dbg(FYI, "open failed rc=%d\n", rc);
 542                 return rc;
 543         }
 544
 545         while (1) {
 546                 smb2_data = kzalloc(ea_buf_size, GFP_KERNEL);
 547                 if (smb2_data == NULL) {
 548                         SMB2_close(xid, tcon, fid.persistent_fid,
 549                                    fid.volatile_fid);
 550                         return -ENOMEM;
 551                 }
 552
 553                 rc = SMB2_query_eas(xid, tcon, fid.persistent_fid,
 554                                     fid.volatile_fid,
 555                                     ea_buf_size, smb2_data);
 556
 557                 if (rc != -E2BIG)
 558                         break;
 559
 560                 kfree(smb2_data);
 561                 ea_buf_size <<= 1;
 562
 563                 if (ea_buf_size > SMB2_MAX_EA_BUF) {
 564                         cifs_dbg(VFS, "EA size is too large\n");
 565                         SMB2_close(xid, tcon, fid.persistent_fid,
 566                                    fid.volatile_fid);
 567                         return -ENOMEM;
 568                 }
 569         }
 570
 571         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 572
 573         if (!rc)
 574                 rc = move_smb2_ea_to_cifs(ea_data, buf_size, smb2_data,
 575                                           SMB2_MAX_EA_BUF, ea_name);
 576
 577         kfree(smb2_data);
 578         return rc;
 579 }
 580
 581
 582 static int
 583 smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
 584             const char *path, const char *ea_name, const void *ea_value,
 585             const __u16 ea_value_len, const struct nls_table *nls_codepage,
 586             struct cifs_sb_info *cifs_sb)
 587 {
 588         int rc;
 589         __le16 *utf16_path;
 590         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 591         struct cifs_open_parms oparms;
 592         struct cifs_fid fid;
 593         struct smb2_file_full_ea_info *ea;
 594         int ea_name_len = strlen(ea_name);
 595         int len;
 596
 597         if (ea_name_len > 255)
 598                 return -EINVAL;
 599
 600         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 601         if (!utf16_path)
 602                 return -ENOMEM;
 603
 604         oparms.tcon = tcon;
 605         oparms.desired_access = FILE_WRITE_EA;
 606         oparms.disposition = FILE_OPEN;
 607         oparms.create_options = 0;
 608         oparms.fid = &fid;
 609         oparms.reconnect = false;
 610
 611         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 612         kfree(utf16_path);
 613         if (rc) {
 614                 cifs_dbg(FYI, "open failed rc=%d\n", rc);
 615                 return rc;
 616         }
 617
 618         len = sizeof(ea) + ea_name_len + ea_value_len + 1;
 619         ea = kzalloc(len, GFP_KERNEL);
 620         if (ea == NULL) {
 621                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 622                 return -ENOMEM;
 623         }
 624
 625         ea->ea_name_length = ea_name_len;
 626         ea->ea_value_length = cpu_to_le16(ea_value_len);
 627         memcpy(ea->ea_data, ea_name, ea_name_len + 1);
 628         memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
 629
 630         rc = SMB2_set_ea(xid, tcon, fid.persistent_fid, fid.volatile_fid, ea,
 631                          len);
 632         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 633
 634         return rc;
 635 }
 636 #endif
 637
 638 static bool
 639 smb2_can_echo(struct TCP_Server_Info *server)
 640 {
 641         return server->echoes;
 642 }
 643
 644 static void
 645 smb2_clear_stats(struct cifs_tcon *tcon)
 646 {
 647 #ifdef CONFIG_CIFS_STATS
 648         int i;
 649         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
 650                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
 651                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
 652         }
 653 #endif
 654 }
 655
 656 static void
 657 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
 658 {
 659         seq_puts(m, "\n\tShare Capabilities:");
 660         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
 661                 seq_puts(m, " DFS,");
 662         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
 663                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
 664         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
 665                 seq_puts(m, " SCALEOUT,");
 666         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
 667                 seq_puts(m, " CLUSTER,");
 668         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
 669                 seq_puts(m, " ASYMMETRIC,");
 670         if (tcon->capabilities == 0)
 671                 seq_puts(m, " None");
 672         if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
 673                 seq_puts(m, " Aligned,");
 674         if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
 675                 seq_puts(m, " Partition Aligned,");
 676         if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
 677                 seq_puts(m, " SSD,");
 678         if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
 679                 seq_puts(m, " TRIM-support,");
 680
 681         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
 682         if (tcon->perf_sector_size)
 683                 seq_printf(m, "\tOptimal sector size: 0x%x",
 684                            tcon->perf_sector_size);
 685 }
 686
 687 static void
 688 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 689 {
 690 #ifdef CONFIG_CIFS_STATS
 691         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
 692         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
 693         seq_printf(m, "\nNegotiates: %d sent %d failed",
 694                    atomic_read(&sent[SMB2_NEGOTIATE_HE]),
 695                    atomic_read(&failed[SMB2_NEGOTIATE_HE]));
 696         seq_printf(m, "\nSessionSetups: %d sent %d failed",
 697                    atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
 698                    atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
 699         seq_printf(m, "\nLogoffs: %d sent %d failed",
 700                    atomic_read(&sent[SMB2_LOGOFF_HE]),
 701                    atomic_read(&failed[SMB2_LOGOFF_HE]));
 702         seq_printf(m, "\nTreeConnects: %d sent %d failed",
 703                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
 704                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
 705         seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
 706                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
 707                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
 708         seq_printf(m, "\nCreates: %d sent %d failed",
 709                    atomic_read(&sent[SMB2_CREATE_HE]),
 710                    atomic_read(&failed[SMB2_CREATE_HE]));
 711         seq_printf(m, "\nCloses: %d sent %d failed",
 712                    atomic_read(&sent[SMB2_CLOSE_HE]),
 713                    atomic_read(&failed[SMB2_CLOSE_HE]));
 714         seq_printf(m, "\nFlushes: %d sent %d failed",
 715                    atomic_read(&sent[SMB2_FLUSH_HE]),
 716                    atomic_read(&failed[SMB2_FLUSH_HE]));
 717         seq_printf(m, "\nReads: %d sent %d failed",
 718                    atomic_read(&sent[SMB2_READ_HE]),
 719                    atomic_read(&failed[SMB2_READ_HE]));
 720         seq_printf(m, "\nWrites: %d sent %d failed",
 721                    atomic_read(&sent[SMB2_WRITE_HE]),
 722                    atomic_read(&failed[SMB2_WRITE_HE]));
 723         seq_printf(m, "\nLocks: %d sent %d failed",
 724                    atomic_read(&sent[SMB2_LOCK_HE]),
 725                    atomic_read(&failed[SMB2_LOCK_HE]));
 726         seq_printf(m, "\nIOCTLs: %d sent %d failed",
 727                    atomic_read(&sent[SMB2_IOCTL_HE]),
 728                    atomic_read(&failed[SMB2_IOCTL_HE]));
 729         seq_printf(m, "\nCancels: %d sent %d failed",
 730                    atomic_read(&sent[SMB2_CANCEL_HE]),
 731                    atomic_read(&failed[SMB2_CANCEL_HE]));
 732         seq_printf(m, "\nEchos: %d sent %d failed",
 733                    atomic_read(&sent[SMB2_ECHO_HE]),
 734                    atomic_read(&failed[SMB2_ECHO_HE]));
 735         seq_printf(m, "\nQueryDirectories: %d sent %d failed",
 736                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
 737                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
 738         seq_printf(m, "\nChangeNotifies: %d sent %d failed",
 739                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
 740                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
 741         seq_printf(m, "\nQueryInfos: %d sent %d failed",
 742                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
 743                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
 744         seq_printf(m, "\nSetInfos: %d sent %d failed",
 745                    atomic_read(&sent[SMB2_SET_INFO_HE]),
 746                    atomic_read(&failed[SMB2_SET_INFO_HE]));
 747         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
 748                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
 749                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
 750 #endif
 751 }
 752
 753 static void
 754 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
 755 {
 756         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
 757         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
 758
 759         cfile->fid.persistent_fid = fid->persistent_fid;
 760         cfile->fid.volatile_fid = fid->volatile_fid;
 761         server->ops->set_oplock_level(cinode, oplock, fid->epoch,
 762                                       &fid->purge_cache);
 763         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
 764         memcpy(cfile->fid.create_guid, fid->create_guid, 16);
 765 }
 766
 767 static void
 768 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
 769                 struct cifs_fid *fid)
 770 {
 771         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 772 }
 773
 774 static int
 775 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
 776                      u64 persistent_fid, u64 volatile_fid,
 777                      struct copychunk_ioctl *pcchunk)
 778 {
 779         int rc;
 780         unsigned int ret_data_len;
 781         struct resume_key_req *res_key;
 782
 783         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
 784                         FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
 785                         false /* use_ipc */,
 786                         NULL, 0 /* no input */,
 787                         (char **)&res_key, &ret_data_len);
 788
 789         if (rc) {
 790                 cifs_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
 791                 goto req_res_key_exit;
 792         }
 793         if (ret_data_len < sizeof(struct resume_key_req)) {
 794                 cifs_dbg(VFS, "Invalid refcopy resume key length\n");
 795                 rc = -EINVAL;
 796                 goto req_res_key_exit;
 797         }
 798         memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
 799
 800 req_res_key_exit:
 801         kfree(res_key);
 802         return rc;
 803 }
 804
 805 static ssize_t
 806 smb2_copychunk_range(const unsigned int xid,
 807                         struct cifsFileInfo *srcfile,
 808                         struct cifsFileInfo *trgtfile, u64 src_off,
 809                         u64 len, u64 dest_off)
 810 {
 811         int rc;
 812         unsigned int ret_data_len;
 813         struct copychunk_ioctl *pcchunk;
 814         struct copychunk_ioctl_rsp *retbuf = NULL;
 815         struct cifs_tcon *tcon;
 816         int chunks_copied = 0;
 817         bool chunk_sizes_updated = false;
 818         ssize_t bytes_written, total_bytes_written = 0;
 819
 820         pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
 821
 822         if (pcchunk == NULL)
 823                 return -ENOMEM;
 824
 825         cifs_dbg(FYI, "in smb2_copychunk_range - about to call request res key\n");
 826         /* Request a key from the server to identify the source of the copy */
 827         rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
 828                                 srcfile->fid.persistent_fid,
 829                                 srcfile->fid.volatile_fid, pcchunk);
 830
 831         /* Note: request_res_key sets res_key null only if rc !=0 */
 832         if (rc)
 833                 goto cchunk_out;
 834
 835         /* For now array only one chunk long, will make more flexible later */
 836         pcchunk->ChunkCount = cpu_to_le32(1);
 837         pcchunk->Reserved = 0;
 838         pcchunk->Reserved2 = 0;
 839
 840         tcon = tlink_tcon(trgtfile->tlink);
 841
 842         while (len > 0) {
 843                 pcchunk->SourceOffset = cpu_to_le64(src_off);
 844                 pcchunk->TargetOffset = cpu_to_le64(dest_off);
 845                 pcchunk->Length =
 846                         cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
 847
 848                 /* Request server copy to target from src identified by key */
 849                 rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
 850                         trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
 851                         true /* is_fsctl */, false /* use_ipc */,
 852                         (char *)pcchunk,
 853                         sizeof(struct copychunk_ioctl), (char **)&retbuf,
 854                         &ret_data_len);
 855                 if (rc == 0) {
 856                         if (ret_data_len !=
 857                                         sizeof(struct copychunk_ioctl_rsp)) {
 858                                 cifs_dbg(VFS, "invalid cchunk response size\n");
 859                                 rc = -EIO;
 860                                 goto cchunk_out;
 861                         }
 862                         if (retbuf->TotalBytesWritten == 0) {
 863                                 cifs_dbg(FYI, "no bytes copied\n");
 864                                 rc = -EIO;
 865                                 goto cchunk_out;
 866                         }
 867                         /*
 868                          * Check if server claimed to write more than we asked
 869                          */
 870                         if (le32_to_cpu(retbuf->TotalBytesWritten) >
 871                             le32_to_cpu(pcchunk->Length)) {
 872                                 cifs_dbg(VFS, "invalid copy chunk response\n");
 873                                 rc = -EIO;
 874                                 goto cchunk_out;
 875                         }
 876                         if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
 877                                 cifs_dbg(VFS, "invalid num chunks written\n");
 878                                 rc = -EIO;
 879                                 goto cchunk_out;
 880                         }
 881                         chunks_copied++;
 882
 883                         bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
 884                         src_off += bytes_written;
 885                         dest_off += bytes_written;
 886                         len -= bytes_written;
 887                         total_bytes_written += bytes_written;
 888
 889                         cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
 890                                 le32_to_cpu(retbuf->ChunksWritten),
 891                                 le32_to_cpu(retbuf->ChunkBytesWritten),
 892                                 bytes_written);
 893                 } else if (rc == -EINVAL) {
 894                         if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
 895                                 goto cchunk_out;
 896
 897                         cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
 898                                 le32_to_cpu(retbuf->ChunksWritten),
 899                                 le32_to_cpu(retbuf->ChunkBytesWritten),
 900                                 le32_to_cpu(retbuf->TotalBytesWritten));
 901
 902                         /*
 903                          * Check if this is the first request using these sizes,
 904                          * (ie check if copy succeed once with original sizes
 905                          * and check if the server gave us different sizes after
 906                          * we already updated max sizes on previous request).
 907                          * if not then why is the server returning an error now
 908                          */
 909                         if ((chunks_copied != 0) || chunk_sizes_updated)
 910                                 goto cchunk_out;
 911
 912                         /* Check that server is not asking us to grow size */
 913                         if (le32_to_cpu(retbuf->ChunkBytesWritten) <
 914                                         tcon->max_bytes_chunk)
 915                                 tcon->max_bytes_chunk =
 916                                         le32_to_cpu(retbuf->ChunkBytesWritten);
 917                         else
 918                                 goto cchunk_out; /* server gave us bogus size */
 919
 920                         /* No need to change MaxChunks since already set to 1 */
 921                         chunk_sizes_updated = true;
 922                 } else
 923                         goto cchunk_out;
 924         }
 925
 926 cchunk_out:
 927         kfree(pcchunk);
 928         kfree(retbuf);
 929         if (rc)
 930                 return rc;
 931         else
 932                 return total_bytes_written;
 933 }
 934
 935 static int
 936 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
 937                 struct cifs_fid *fid)
 938 {
 939         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 940 }
 941
 942 static unsigned int
 943 smb2_read_data_offset(char *buf)
 944 {
 945         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 946         return rsp->DataOffset;
 947 }
 948
 949 static unsigned int
 950 smb2_read_data_length(char *buf)
 951 {
 952         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 953         return le32_to_cpu(rsp->DataLength);
 954 }
 955
 956
 957 static int
 958 smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
 959                struct cifs_io_parms *parms, unsigned int *bytes_read,
 960                char **buf, int *buf_type)
 961 {
 962         parms->persistent_fid = pfid->persistent_fid;
 963         parms->volatile_fid = pfid->volatile_fid;
 964         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
 965 }
 966
 967 static int
 968 smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
 969                 struct cifs_io_parms *parms, unsigned int *written,
 970                 struct kvec *iov, unsigned long nr_segs)
 971 {
 972
 973         parms->persistent_fid = pfid->persistent_fid;
 974         parms->volatile_fid = pfid->volatile_fid;
 975         return SMB2_write(xid, parms, written, iov, nr_segs);
 976 }
 977
 978 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
 979 static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
 980                 struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
 981 {
 982         struct cifsInodeInfo *cifsi;
 983         int rc;
 984
 985         cifsi = CIFS_I(inode);
 986
 987         /* if file already sparse don't bother setting sparse again */
 988         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
 989                 return true; /* already sparse */
 990
 991         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
 992                 return true; /* already not sparse */
 993
 994         /*
 995          * Can't check for sparse support on share the usual way via the
 996          * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
 997          * since Samba server doesn't set the flag on the share, yet
 998          * supports the set sparse FSCTL and returns sparse correctly
 999          * in the file attributes. If we fail setting sparse though we
1000          * mark that server does not support sparse files for this share
1001          * to avoid repeatedly sending the unsupported fsctl to server
1002          * if the file is repeatedly extended.
1003          */
1004         if (tcon->broken_sparse_sup)
1005                 return false;
1006
1007         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1008                         cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
1009                         true /* is_fctl */, false /* use_ipc */,
1010                         &setsparse, 1, NULL, NULL);
1011         if (rc) {
1012                 tcon->broken_sparse_sup = true;
1013                 cifs_dbg(FYI, "set sparse rc = %d\n", rc);
1014                 return false;
1015         }
1016
1017         if (setsparse)
1018                 cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
1019         else
1020                 cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
1021
1022         return true;
1023 }
1024
1025 static int
1026 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
1027                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
1028 {
1029         __le64 eof = cpu_to_le64(size);
1030         struct inode *inode;
1031
1032         /*
1033          * If extending file more than one page make sparse. Many Linux fs
1034          * make files sparse by default when extending via ftruncate
1035          */
1036         inode = d_inode(cfile->dentry);
1037
1038         if (!set_alloc && (size > inode->i_size + 8192)) {
1039                 __u8 set_sparse = 1;
1040
1041                 /* whether set sparse succeeds or not, extend the file */
1042                 smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
1043         }
1044
1045         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
1046                             cfile->fid.volatile_fid, cfile->pid, &eof, false);
1047 }
1048
1049 static int
1050 smb2_duplicate_extents(const unsigned int xid,
1051                         struct cifsFileInfo *srcfile,
1052                         struct cifsFileInfo *trgtfile, u64 src_off,
1053                         u64 len, u64 dest_off)
1054 {
1055         int rc;
1056         unsigned int ret_data_len;
1057         struct duplicate_extents_to_file dup_ext_buf;
1058         struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
1059
1060         /* server fileays advertise duplicate extent support with this flag */
1061         if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
1062              FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
1063                 return -EOPNOTSUPP;
1064
1065         dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
1066         dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
1067         dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
1068         dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
1069         dup_ext_buf.ByteCount = cpu_to_le64(len);
1070         cifs_dbg(FYI, "duplicate extents: src off %lld dst off %lld len %lld",
1071                 src_off, dest_off, len);
1072
1073         rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
1074         if (rc)
1075                 goto duplicate_extents_out;
1076
1077         rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1078                         trgtfile->fid.volatile_fid,
1079                         FSCTL_DUPLICATE_EXTENTS_TO_FILE,
1080                         true /* is_fsctl */, false /* use_ipc */,
1081                         (char *)&dup_ext_buf,
1082                         sizeof(struct duplicate_extents_to_file),
1083                         NULL,
1084                         &ret_data_len);
1085
1086         if (ret_data_len > 0)
1087                 cifs_dbg(FYI, "non-zero response length in duplicate extents");
1088
1089 duplicate_extents_out:
1090         return rc;
1091 }
1092
1093 static int
1094 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1095                    struct cifsFileInfo *cfile)
1096 {
1097         return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
1098                             cfile->fid.volatile_fid);
1099 }
1100
1101 static int
1102 smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
1103                    struct cifsFileInfo *cfile)
1104 {
1105         struct fsctl_set_integrity_information_req integr_info;
1106         unsigned int ret_data_len;
1107
1108         integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
1109         integr_info.Flags = 0;
1110         integr_info.Reserved = 0;
1111
1112         return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1113                         cfile->fid.volatile_fid,
1114                         FSCTL_SET_INTEGRITY_INFORMATION,
1115                         true /* is_fsctl */, false /* use_ipc */,
1116                         (char *)&integr_info,
1117                         sizeof(struct fsctl_set_integrity_information_req),
1118                         NULL,
1119                         &ret_data_len);
1120
1121 }
1122
1123 static int
1124 smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
1125                    struct cifsFileInfo *cfile, void __user *ioc_buf)
1126 {
1127         char *retbuf = NULL;
1128         unsigned int ret_data_len = 0;
1129         int rc;
1130         struct smb_snapshot_array snapshot_in;
1131
1132         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1133                         cfile->fid.volatile_fid,
1134                         FSCTL_SRV_ENUMERATE_SNAPSHOTS,
1135                         true /* is_fsctl */, false /* use_ipc */,
1136                         NULL, 0 /* no input data */,
1137                         (char **)&retbuf,
1138                         &ret_data_len);
1139         cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
1140                         rc, ret_data_len);
1141         if (rc)
1142                 return rc;
1143
1144         if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
1145                 /* Fixup buffer */
1146                 if (copy_from_user(&snapshot_in, ioc_buf,
1147                     sizeof(struct smb_snapshot_array))) {
1148                         rc = -EFAULT;
1149                         kfree(retbuf);
1150                         return rc;
1151                 }
1152                 if (snapshot_in.snapshot_array_size < sizeof(struct smb_snapshot_array)) {
1153                         rc = -ERANGE;
1154                         kfree(retbuf);
1155                         return rc;
1156                 }
1157
1158                 if (ret_data_len > snapshot_in.snapshot_array_size)
1159                         ret_data_len = snapshot_in.snapshot_array_size;
1160
1161                 if (copy_to_user(ioc_buf, retbuf, ret_data_len))
1162                         rc = -EFAULT;
1163         }
1164
1165         kfree(retbuf);
1166         return rc;
1167 }
1168
1169 static int
1170 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
1171                      const char *path, struct cifs_sb_info *cifs_sb,
1172                      struct cifs_fid *fid, __u16 search_flags,
1173                      struct cifs_search_info *srch_inf)
1174 {
1175         __le16 *utf16_path;
1176         int rc;
1177         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1178         struct cifs_open_parms oparms;
1179
1180         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1181         if (!utf16_path)
1182                 return -ENOMEM;
1183
1184         oparms.tcon = tcon;
1185         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
1186         oparms.disposition = FILE_OPEN;
1187         oparms.create_options = 0;
1188         oparms.fid = fid;
1189         oparms.reconnect = false;
1190
1191         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
1192         kfree(utf16_path);
1193         if (rc) {
1194                 cifs_dbg(FYI, "open dir failed rc=%d\n", rc);
1195                 return rc;
1196         }
1197
1198         srch_inf->entries_in_buffer = 0;
1199         srch_inf->index_of_last_entry = 0;
1200
1201         rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
1202                                   fid->volatile_fid, 0, srch_inf);
1203         if (rc) {
1204                 cifs_dbg(FYI, "query directory failed rc=%d\n", rc);
1205                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1206         }
1207         return rc;
1208 }
1209
1210 static int
1211 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
1212                     struct cifs_fid *fid, __u16 search_flags,
1213                     struct cifs_search_info *srch_inf)
1214 {
1215         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
1216                                     fid->volatile_fid, 0, srch_inf);
1217 }
1218
1219 static int
1220 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
1221                struct cifs_fid *fid)
1222 {
1223         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1224 }
1225
1226 /*
1227 * If we negotiate SMB2 protocol and get STATUS_PENDING - update
1228 * the number of credits and return true. Otherwise - return false.
1229 */
1230 static bool
1231 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
1232 {
1233         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
1234
1235         if (shdr->Status != STATUS_PENDING)
1236                 return false;
1237
1238         if (!length) {
1239                 spin_lock(&server->req_lock);
1240                 server->credits += le16_to_cpu(shdr->CreditRequest);
1241                 spin_unlock(&server->req_lock);
1242                 wake_up(&server->request_q);
1243         }
1244
1245         return true;
1246 }
1247
1248 static bool
1249 smb2_is_session_expired(char *buf)
1250 {
1251         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
1252
1253         if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED)
1254                 return false;
1255
1256         cifs_dbg(FYI, "Session expired\n");
1257         return true;
1258 }
1259
1260 static int
1261 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
1262                      struct cifsInodeInfo *cinode)
1263 {
1264         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
1265                 return SMB2_lease_break(0, tcon, cinode->lease_key,
1266                                         smb2_get_lease_state(cinode));
1267
1268         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
1269                                  fid->volatile_fid,
1270                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
1271 }
1272
1273 static int
1274 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
1275              struct kstatfs *buf)
1276 {
1277         int rc;
1278         __le16 srch_path = 0; /* Null - open root of share */
1279         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1280         struct cifs_open_parms oparms;
1281         struct cifs_fid fid;
1282
1283         oparms.tcon = tcon;
1284         oparms.desired_access = FILE_READ_ATTRIBUTES;
1285         oparms.disposition = FILE_OPEN;
1286         oparms.create_options = 0;
1287         oparms.fid = &fid;
1288         oparms.reconnect = false;
1289
1290         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
1291         if (rc)
1292                 return rc;
1293         buf->f_type = SMB2_MAGIC_NUMBER;
1294         rc = SMB2_QFS_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
1295                            buf);
1296         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1297         return rc;
1298 }
1299
1300 static bool
1301 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
1302 {
1303         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
1304                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
1305 }
1306
1307 static int
1308 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
1309                __u64 length, __u32 type, int lock, int unlock, bool wait)
1310 {
1311         if (unlock && !lock)
1312                 type = SMB2_LOCKFLAG_UNLOCK;
1313         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
1314                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
1315                          current->tgid, length, offset, type, wait);
1316 }
1317
1318 static void
1319 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
1320 {
1321         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
1322 }
1323
1324 static void
1325 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
1326 {
1327         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
1328 }
1329
1330 static void
1331 smb2_new_lease_key(struct cifs_fid *fid)
1332 {
1333         generate_random_uuid(fid->lease_key);
1334 }
1335
1336 static int
1337 smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
1338                    const char *search_name,
1339                    struct dfs_info3_param **target_nodes,
1340                    unsigned int *num_of_nodes,
1341                    const struct nls_table *nls_codepage, int remap)
1342 {
1343         int rc;
1344         __le16 *utf16_path = NULL;
1345         int utf16_path_len = 0;
1346         struct cifs_tcon *tcon;
1347         struct fsctl_get_dfs_referral_req *dfs_req = NULL;
1348         struct get_dfs_referral_rsp *dfs_rsp = NULL;
1349         u32 dfs_req_size = 0, dfs_rsp_size = 0;
1350
1351         cifs_dbg(FYI, "smb2_get_dfs_refer path <%s>\n", search_name);
1352
1353         /*
1354          * Use any tcon from the current session. Here, the first one.
1355          */
1356         spin_lock(&cifs_tcp_ses_lock);
1357         tcon = list_first_entry_or_null(&ses->tcon_list, struct cifs_tcon,
1358                                         tcon_list);
1359         if (tcon)
1360                 tcon->tc_count++;
1361         spin_unlock(&cifs_tcp_ses_lock);
1362
1363         if (!tcon) {
1364                 cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
1365                          ses);
1366                 rc = -ENOTCONN;
1367                 goto out;
1368         }
1369
1370         utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
1371                                            &utf16_path_len,
1372                                            nls_codepage, remap);
1373         if (!utf16_path) {
1374                 rc = -ENOMEM;
1375                 goto out;
1376         }
1377
1378         dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
1379         dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
1380         if (!dfs_req) {
1381                 rc = -ENOMEM;
1382                 goto out;
1383         }
1384
1385         /* Highest DFS referral version understood */
1386         dfs_req->MaxReferralLevel = DFS_VERSION;
1387
1388         /* Path to resolve in an UTF-16 null-terminated string */
1389         memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
1390
1391         do {
1392                 /* try first with IPC */
1393                 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1394                                 FSCTL_DFS_GET_REFERRALS,
1395                                 true /* is_fsctl */, true /* use_ipc */,
1396                                 (char *)dfs_req, dfs_req_size,
1397                                 (char **)&dfs_rsp, &dfs_rsp_size);
1398                 if (rc == -ENOTCONN) {
1399                         /* try with normal tcon */
1400                         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1401                                         FSCTL_DFS_GET_REFERRALS,
1402                                         true /* is_fsctl */, false /*use_ipc*/,
1403                                         (char *)dfs_req, dfs_req_size,
1404                                         (char **)&dfs_rsp, &dfs_rsp_size);
1405                 }
1406         } while (rc == -EAGAIN);
1407
1408         if (rc) {
1409                 cifs_dbg(VFS, "ioctl error in smb2_get_dfs_refer rc=%d\n", rc);
1410                 goto out;
1411         }
1412
1413         rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
1414                                  num_of_nodes, target_nodes,
1415                                  nls_codepage, remap, search_name,
1416                                  true /* is_unicode */);
1417         if (rc) {
1418                 cifs_dbg(VFS, "parse error in smb2_get_dfs_refer rc=%d\n", rc);
1419                 goto out;
1420         }
1421
1422  out:
1423         if (tcon) {
1424                 spin_lock(&cifs_tcp_ses_lock);
1425                 tcon->tc_count--;
1426                 spin_unlock(&cifs_tcp_ses_lock);
1427         }
1428         kfree(utf16_path);
1429         kfree(dfs_req);
1430         kfree(dfs_rsp);
1431         return rc;
1432 }
1433 #define SMB2_SYMLINK_STRUCT_SIZE \
1434         (sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
1435
1436 static int
1437 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
1438                    const char *full_path, char **target_path,
1439                    struct cifs_sb_info *cifs_sb)
1440 {
1441         int rc;
1442         __le16 *utf16_path;
1443         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1444         struct cifs_open_parms oparms;
1445         struct cifs_fid fid;
1446         struct smb2_err_rsp *err_buf = NULL;
1447         struct smb2_symlink_err_rsp *symlink;
1448         unsigned int sub_len;
1449         unsigned int sub_offset;
1450         unsigned int print_len;
1451         unsigned int print_offset;
1452
1453         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
1454
1455         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1456         if (!utf16_path)
1457                 return -ENOMEM;
1458
1459         oparms.tcon = tcon;
1460         oparms.desired_access = FILE_READ_ATTRIBUTES;
1461         oparms.disposition = FILE_OPEN;
1462         oparms.create_options = 0;
1463         oparms.fid = &fid;
1464         oparms.reconnect = false;
1465
1466         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_buf);
1467
1468         if (!rc || !err_buf) {
1469                 kfree(utf16_path);
1470                 return -ENOENT;
1471         }
1472
1473         if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
1474             get_rfc1002_length(err_buf) + 4 < SMB2_SYMLINK_STRUCT_SIZE) {
1475                 kfree(utf16_path);
1476                 return -ENOENT;
1477         }
1478
1479         /* open must fail on symlink - reset rc */
1480         rc = 0;
1481         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
1482         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
1483         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
1484         print_len = le16_to_cpu(symlink->PrintNameLength);
1485         print_offset = le16_to_cpu(symlink->PrintNameOffset);
1486
1487         if (get_rfc1002_length(err_buf) + 4 <
1488                         SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
1489                 kfree(utf16_path);
1490                 return -ENOENT;
1491         }
1492
1493         if (get_rfc1002_length(err_buf) + 4 <
1494                         SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
1495                 kfree(utf16_path);
1496                 return -ENOENT;
1497         }
1498
1499         *target_path = cifs_strndup_from_utf16(
1500                                 (char *)symlink->PathBuffer + sub_offset,
1501                                 sub_len, true, cifs_sb->local_nls);
1502         if (!(*target_path)) {
1503                 kfree(utf16_path);
1504                 return -ENOMEM;
1505         }
1506         convert_delimiter(*target_path, '/');
1507         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
1508         kfree(utf16_path);
1509         return rc;
1510 }
1511
1512 #ifdef CONFIG_CIFS_ACL
1513 static struct cifs_ntsd *
1514 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
1515                 const struct cifs_fid *cifsfid, u32 *pacllen)
1516 {
1517         struct cifs_ntsd *pntsd = NULL;
1518         unsigned int xid;
1519         int rc = -EOPNOTSUPP;
1520         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
1521
1522         if (IS_ERR(tlink))
1523                 return ERR_CAST(tlink);
1524
1525         xid = get_xid();
1526         cifs_dbg(FYI, "trying to get acl\n");
1527
1528         rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
1529                             cifsfid->volatile_fid, (void **)&pntsd, pacllen);
1530         free_xid(xid);
1531
1532         cifs_put_tlink(tlink);
1533
1534         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
1535         if (rc)
1536                 return ERR_PTR(rc);
1537         return pntsd;
1538
1539 }
1540
1541 static struct cifs_ntsd *
1542 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
1543                 const char *path, u32 *pacllen)
1544 {
1545         struct cifs_ntsd *pntsd = NULL;
1546         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1547         unsigned int xid;
1548         int rc;
1549         struct cifs_tcon *tcon;
1550         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
1551         struct cifs_fid fid;
1552         struct cifs_open_parms oparms;
1553         __le16 *utf16_path;
1554
1555         cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
1556         if (IS_ERR(tlink))
1557                 return ERR_CAST(tlink);
1558
1559         tcon = tlink_tcon(tlink);
1560         xid = get_xid();
1561
1562         if (backup_cred(cifs_sb))
1563                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1564         else
1565                 oparms.create_options = 0;
1566
1567         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1568         if (!utf16_path)
1569                 return ERR_PTR(-ENOMEM);
1570
1571         oparms.tcon = tcon;
1572         oparms.desired_access = READ_CONTROL;
1573         oparms.disposition = FILE_OPEN;
1574         oparms.fid = &fid;
1575         oparms.reconnect = false;
1576
1577         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
1578         kfree(utf16_path);
1579         if (!rc) {
1580                 rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
1581                             fid.volatile_fid, (void **)&pntsd, pacllen);
1582                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1583         }
1584
1585         cifs_put_tlink(tlink);
1586         free_xid(xid);
1587
1588         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
1589         if (rc)
1590                 return ERR_PTR(rc);
1591         return pntsd;
1592 }
1593
1594 #ifdef CONFIG_CIFS_ACL
1595 static int
1596 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
1597                 struct inode *inode, const char *path, int aclflag)
1598 {
1599         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1600         unsigned int xid;
1601         int rc, access_flags = 0;
1602         struct cifs_tcon *tcon;
1603         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1604         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
1605         struct cifs_fid fid;
1606         struct cifs_open_parms oparms;
1607         __le16 *utf16_path;
1608
1609         cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
1610         if (IS_ERR(tlink))
1611                 return PTR_ERR(tlink);
1612
1613         tcon = tlink_tcon(tlink);
1614         xid = get_xid();
1615
1616         if (backup_cred(cifs_sb))
1617                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1618         else
1619                 oparms.create_options = 0;
1620
1621         if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
1622                 access_flags = WRITE_OWNER;
1623         else
1624                 access_flags = WRITE_DAC;
1625
1626         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1627         if (!utf16_path)
1628                 return -ENOMEM;
1629
1630         oparms.tcon = tcon;
1631         oparms.desired_access = access_flags;
1632         oparms.disposition = FILE_OPEN;
1633         oparms.path = path;
1634         oparms.fid = &fid;
1635         oparms.reconnect = false;
1636
1637         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
1638         kfree(utf16_path);
1639         if (!rc) {
1640                 rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
1641                             fid.volatile_fid, pnntsd, acllen, aclflag);
1642                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1643         }
1644
1645         cifs_put_tlink(tlink);
1646         free_xid(xid);
1647         return rc;
1648 }
1649 #endif /* CIFS_ACL */
1650
1651 /* Retrieve an ACL from the server */
1652 static struct cifs_ntsd *
1653 get_smb2_acl(struct cifs_sb_info *cifs_sb,
1654                                       struct inode *inode, const char *path,
1655                                       u32 *pacllen)
1656 {
1657         struct cifs_ntsd *pntsd = NULL;
1658         struct cifsFileInfo *open_file = NULL;
1659
1660         if (inode)
1661                 open_file = find_readable_file(CIFS_I(inode), true);
1662         if (!open_file)
1663                 return get_smb2_acl_by_path(cifs_sb, path, pacllen);
1664
1665         pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
1666         cifsFileInfo_put(open_file);
1667         return pntsd;
1668 }
1669 #endif
1670
1671 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
1672                             loff_t offset, loff_t len, bool keep_size)
1673 {
1674         struct inode *inode;
1675         struct cifsInodeInfo *cifsi;
1676         struct cifsFileInfo *cfile = file->private_data;
1677         struct file_zero_data_information fsctl_buf;
1678         long rc;
1679         unsigned int xid;
1680
1681         xid = get_xid();
1682
1683         inode = d_inode(cfile->dentry);
1684         cifsi = CIFS_I(inode);
1685
1686         /* if file not oplocked can't be sure whether asking to extend size */
1687         if (!CIFS_CACHE_READ(cifsi))
1688                 if (keep_size == false)
1689                         return -EOPNOTSUPP;
1690
1691         /*
1692          * Must check if file sparse since fallocate -z (zero range) assumes
1693          * non-sparse allocation
1694          */
1695         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE))
1696                 return -EOPNOTSUPP;
1697
1698         /*
1699          * need to make sure we are not asked to extend the file since the SMB3
1700          * fsctl does not change the file size. In the future we could change
1701          * this to zero the first part of the range then set the file size
1702          * which for a non sparse file would zero the newly extended range
1703          */
1704         if (keep_size == false)
1705                 if (i_size_read(inode) < offset + len)
1706                         return -EOPNOTSUPP;
1707
1708         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
1709
1710         fsctl_buf.FileOffset = cpu_to_le64(offset);
1711         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
1712
1713         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1714                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
1715                         true /* is_fctl */, false /* use_ipc */,
1716                         (char *)&fsctl_buf,
1717                         sizeof(struct file_zero_data_information), NULL, NULL);
1718         free_xid(xid);
1719         return rc;
1720 }
1721
1722 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
1723                             loff_t offset, loff_t len)
1724 {
1725         struct inode *inode;
1726         struct cifsInodeInfo *cifsi;
1727         struct cifsFileInfo *cfile = file->private_data;
1728         struct file_zero_data_information fsctl_buf;
1729         long rc;
1730         unsigned int xid;
1731         __u8 set_sparse = 1;
1732
1733         xid = get_xid();
1734
1735         inode = d_inode(cfile->dentry);
1736         cifsi = CIFS_I(inode);
1737
1738         /* Need to make file sparse, if not already, before freeing range. */
1739         /* Consider adding equivalent for compressed since it could also work */
1740         if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse))
1741                 return -EOPNOTSUPP;
1742
1743         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
1744
1745         fsctl_buf.FileOffset = cpu_to_le64(offset);
1746         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
1747
1748         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1749                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
1750                         true /* is_fctl */, false /* use_ipc */,
1751                         (char *)&fsctl_buf,
1752                         sizeof(struct file_zero_data_information), NULL, NULL);
1753         free_xid(xid);
1754         return rc;
1755 }
1756
1757 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
1758                             loff_t off, loff_t len, bool keep_size)
1759 {
1760         struct inode *inode;
1761         struct cifsInodeInfo *cifsi;
1762         struct cifsFileInfo *cfile = file->private_data;
1763         long rc = -EOPNOTSUPP;
1764         unsigned int xid;
1765
1766         xid = get_xid();
1767
1768         inode = d_inode(cfile->dentry);
1769         cifsi = CIFS_I(inode);
1770
1771         /* if file not oplocked can't be sure whether asking to extend size */
1772         if (!CIFS_CACHE_READ(cifsi))
1773                 if (keep_size == false)
1774                         return -EOPNOTSUPP;
1775
1776         /*
1777          * Files are non-sparse by default so falloc may be a no-op
1778          * Must check if file sparse. If not sparse, and not extending
1779          * then no need to do anything since file already allocated
1780          */
1781         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
1782                 if (keep_size == true)
1783                         return 0;
1784                 /* check if extending file */
1785                 else if (i_size_read(inode) >= off + len)
1786                         /* not extending file and already not sparse */
1787                         return 0;
1788                 /* BB: in future add else clause to extend file */
1789                 else
1790                         return -EOPNOTSUPP;
1791         }
1792
1793         if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
1794                 /*
1795                  * Check if falloc starts within first few pages of file
1796                  * and ends within a few pages of the end of file to
1797                  * ensure that most of file is being forced to be
1798                  * fallocated now. If so then setting whole file sparse
1799                  * ie potentially making a few extra pages at the beginning
1800                  * or end of the file non-sparse via set_sparse is harmless.
1801                  */
1802                 if ((off > 8192) || (off + len + 8192 < i_size_read(inode)))
1803                         return -EOPNOTSUPP;
1804
1805                 rc = smb2_set_sparse(xid, tcon, cfile, inode, false);
1806         }
1807         /* BB: else ... in future add code to extend file and set sparse */
1808
1809
1810         free_xid(xid);
1811         return rc;
1812 }
1813
1814
1815 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
1816                            loff_t off, loff_t len)
1817 {
1818         /* KEEP_SIZE already checked for by do_fallocate */
1819         if (mode & FALLOC_FL_PUNCH_HOLE)
1820                 return smb3_punch_hole(file, tcon, off, len);
1821         else if (mode & FALLOC_FL_ZERO_RANGE) {
1822                 if (mode & FALLOC_FL_KEEP_SIZE)
1823                         return smb3_zero_range(file, tcon, off, len, true);
1824                 return smb3_zero_range(file, tcon, off, len, false);
1825         } else if (mode == FALLOC_FL_KEEP_SIZE)
1826                 return smb3_simple_falloc(file, tcon, off, len, true);
1827         else if (mode == 0)
1828                 return smb3_simple_falloc(file, tcon, off, len, false);
1829
1830         return -EOPNOTSUPP;
1831 }
1832
1833 static void
1834 smb2_downgrade_oplock(struct TCP_Server_Info *server,
1835                         struct cifsInodeInfo *cinode, bool set_level2)
1836 {
1837         if (set_level2)
1838                 server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
1839                                                 0, NULL);
1840         else
1841                 server->ops->set_oplock_level(cinode, 0, 0, NULL);
1842 }
1843
1844 static void
1845 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
1846                       unsigned int epoch, bool *purge_cache)
1847 {
1848         oplock &= 0xFF;
1849         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
1850                 return;
1851         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1852                 cinode->oplock = CIFS_CACHE_RHW_FLG;
1853                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
1854                          &cinode->vfs_inode);
1855         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
1856                 cinode->oplock = CIFS_CACHE_RW_FLG;
1857                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
1858                          &cinode->vfs_inode);
1859         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
1860                 cinode->oplock = CIFS_CACHE_READ_FLG;
1861                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
1862                          &cinode->vfs_inode);
1863         } else
1864                 cinode->oplock = 0;
1865 }
1866
1867 static void
1868 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
1869                        unsigned int epoch, bool *purge_cache)
1870 {
1871         char message[5] = {0};
1872
1873         oplock &= 0xFF;
1874         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
1875                 return;
1876
1877         cinode->oplock = 0;
1878         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
1879                 cinode->oplock |= CIFS_CACHE_READ_FLG;
1880                 strcat(message, "R");
1881         }
1882         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
1883                 cinode->oplock |= CIFS_CACHE_HANDLE_FLG;
1884                 strcat(message, "H");
1885         }
1886         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
1887                 cinode->oplock |= CIFS_CACHE_WRITE_FLG;
1888                 strcat(message, "W");
1889         }
1890         if (!cinode->oplock)
1891                 strcat(message, "None");
1892         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
1893                  &cinode->vfs_inode);
1894 }
1895
1896 static void
1897 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
1898                       unsigned int epoch, bool *purge_cache)
1899 {
1900         unsigned int old_oplock = cinode->oplock;
1901
1902         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
1903
1904         if (purge_cache) {
1905                 *purge_cache = false;
1906                 if (old_oplock == CIFS_CACHE_READ_FLG) {
1907                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
1908                             (epoch - cinode->epoch > 0))
1909                                 *purge_cache = true;
1910                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
1911                                  (epoch - cinode->epoch > 1))
1912                                 *purge_cache = true;
1913                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
1914                                  (epoch - cinode->epoch > 1))
1915                                 *purge_cache = true;
1916                         else if (cinode->oplock == 0 &&
1917                                  (epoch - cinode->epoch > 0))
1918                                 *purge_cache = true;
1919                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
1920                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
1921                             (epoch - cinode->epoch > 0))
1922                                 *purge_cache = true;
1923                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
1924                                  (epoch - cinode->epoch > 1))
1925                                 *purge_cache = true;
1926                 }
1927                 cinode->epoch = epoch;
1928         }
1929 }
1930
1931 static bool
1932 smb2_is_read_op(__u32 oplock)
1933 {
1934         return oplock == SMB2_OPLOCK_LEVEL_II;
1935 }
1936
1937 static bool
1938 smb21_is_read_op(__u32 oplock)
1939 {
1940         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
1941                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
1942 }
1943
1944 static __le32
1945 map_oplock_to_lease(u8 oplock)
1946 {
1947         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
1948                 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
1949         else if (oplock == SMB2_OPLOCK_LEVEL_II)
1950                 return SMB2_LEASE_READ_CACHING;
1951         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
1952                 return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
1953                        SMB2_LEASE_WRITE_CACHING;
1954         return 0;
1955 }
1956
1957 static char *
1958 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
1959 {
1960         struct create_lease *buf;
1961
1962         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
1963         if (!buf)
1964                 return NULL;
1965
1966         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
1967         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
1968         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
1969
1970         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1971                                         (struct create_lease, lcontext));
1972         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
1973         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1974                                 (struct create_lease, Name));
1975         buf->ccontext.NameLength = cpu_to_le16(4);
1976         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
1977         buf->Name[0] = 'R';
1978         buf->Name[1] = 'q';
1979         buf->Name[2] = 'L';
1980         buf->Name[3] = 's';
1981         return (char *)buf;
1982 }
1983
1984 static char *
1985 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
1986 {
1987         struct create_lease_v2 *buf;
1988
1989         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
1990         if (!buf)
1991                 return NULL;
1992
1993         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
1994         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
1995         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
1996
1997         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1998                                         (struct create_lease_v2, lcontext));
1999         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
2000         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2001                                 (struct create_lease_v2, Name));
2002         buf->ccontext.NameLength = cpu_to_le16(4);
2003         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
2004         buf->Name[0] = 'R';
2005         buf->Name[1] = 'q';
2006         buf->Name[2] = 'L';
2007         buf->Name[3] = 's';
2008         return (char *)buf;
2009 }
2010
2011 static __u8
2012 smb2_parse_lease_buf(void *buf, unsigned int *epoch)
2013 {
2014         struct create_lease *lc = (struct create_lease *)buf;
2015
2016         *epoch = 0; /* not used */
2017         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
2018                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
2019         return le32_to_cpu(lc->lcontext.LeaseState);
2020 }
2021
2022 static __u8
2023 smb3_parse_lease_buf(void *buf, unsigned int *epoch)
2024 {
2025         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
2026
2027         *epoch = le16_to_cpu(lc->lcontext.Epoch);
2028         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
2029                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
2030         return le32_to_cpu(lc->lcontext.LeaseState);
2031 }
2032
2033 static unsigned int
2034 smb2_wp_retry_size(struct inode *inode)
2035 {
2036         return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
2037                      SMB2_MAX_BUFFER_SIZE);
2038 }
2039
2040 static bool
2041 smb2_dir_needs_close(struct cifsFileInfo *cfile)
2042 {
2043         return !cfile->invalidHandle;
2044 }
2045
2046 static void
2047 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, struct smb_rqst *old_rq)
2048 {
2049         struct smb2_sync_hdr *shdr =
2050                         (struct smb2_sync_hdr *)old_rq->rq_iov[1].iov_base;
2051         unsigned int orig_len = get_rfc1002_length(old_rq->rq_iov[0].iov_base);
2052
2053         memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
2054         tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
2055         tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
2056         tr_hdr->Flags = cpu_to_le16(0x01);
2057         get_random_bytes(&tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
2058         memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
2059         inc_rfc1001_len(tr_hdr, sizeof(struct smb2_transform_hdr) - 4);
2060         inc_rfc1001_len(tr_hdr, orig_len);
2061 }
2062
2063 static struct scatterlist *
2064 init_sg(struct smb_rqst *rqst, u8 *sign)
2065 {
2066         unsigned int sg_len = rqst->rq_nvec + rqst->rq_npages + 1;
2067         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 24;
2068         struct scatterlist *sg;
2069         unsigned int i;
2070         unsigned int j;
2071
2072         sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
2073         if (!sg)
2074                 return NULL;
2075
2076         sg_init_table(sg, sg_len);
2077         sg_set_buf(&sg[0], rqst->rq_iov[0].iov_base + 24, assoc_data_len);
2078         for (i = 1; i < rqst->rq_nvec; i++)
2079                 sg_set_buf(&sg[i], rqst->rq_iov[i].iov_base,
2080                                                 rqst->rq_iov[i].iov_len);
2081         for (j = 0; i < sg_len - 1; i++, j++) {
2082                 unsigned int len = (j < rqst->rq_npages - 1) ? rqst->rq_pagesz
2083                                                         : rqst->rq_tailsz;
2084                 sg_set_page(&sg[i], rqst->rq_pages[j], len, 0);
2085         }
2086         sg_set_buf(&sg[sg_len - 1], sign, SMB2_SIGNATURE_SIZE);
2087         return sg;
2088 }
2089
2090 struct cifs_crypt_result {
2091         int err;
2092         struct completion completion;
2093 };
2094
2095 static void cifs_crypt_complete(struct crypto_async_request *req, int err)
2096 {
2097         struct cifs_crypt_result *res = req->data;
2098
2099         if (err == -EINPROGRESS)
2100                 return;
2101
2102         res->err = err;
2103         complete(&res->completion);
2104 }
2105
2106 static int
2107 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
2108 {
2109         struct cifs_ses *ses;
2110         u8 *ses_enc_key;
2111
2112         spin_lock(&cifs_tcp_ses_lock);
2113         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2114                 if (ses->Suid != ses_id)
2115                         continue;
2116                 ses_enc_key = enc ? ses->smb3encryptionkey :
2117                                                         ses->smb3decryptionkey;
2118                 memcpy(key, ses_enc_key, SMB3_SIGN_KEY_SIZE);
2119                 spin_unlock(&cifs_tcp_ses_lock);
2120                 return 0;
2121         }
2122         spin_unlock(&cifs_tcp_ses_lock);
2123
2124         return 1;
2125 }
2126 /*
2127  * Encrypt or decrypt @rqst message. @rqst has the following format:
2128  * iov[0] - transform header (associate data),
2129  * iov[1-N] and pages - data to encrypt.
2130  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
2131  * untouched.
2132  */
2133 static int
2134 crypt_message(struct TCP_Server_Info *server, struct smb_rqst *rqst, int enc)
2135 {
2136         struct smb2_transform_hdr *tr_hdr =
2137                         (struct smb2_transform_hdr *)rqst->rq_iov[0].iov_base;
2138         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 24;
2139         int rc = 0;
2140         struct scatterlist *sg;
2141         u8 sign[SMB2_SIGNATURE_SIZE] = {};
2142         u8 key[SMB3_SIGN_KEY_SIZE];
2143         struct aead_request *req;
2144         char *iv;
2145         unsigned int iv_len;
2146         struct cifs_crypt_result result = {0, };
2147         struct crypto_aead *tfm;
2148         unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
2149
2150         init_completion(&result.completion);
2151
2152         rc = smb2_get_enc_key(server, tr_hdr->SessionId, enc, key);
2153         if (rc) {
2154                 cifs_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
2155                          enc ? "en" : "de");
2156                 return 0;
2157         }
2158
2159         rc = smb3_crypto_aead_allocate(server);
2160         if (rc) {
2161                 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
2162                 return rc;
2163         }
2164
2165         tfm = enc ? server->secmech.ccmaesencrypt :
2166                                                 server->secmech.ccmaesdecrypt;
2167         rc = crypto_aead_setkey(tfm, key, SMB3_SIGN_KEY_SIZE);
2168         if (rc) {
2169                 cifs_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
2170                 return rc;
2171         }
2172
2173         rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
2174         if (rc) {
2175                 cifs_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
2176                 return rc;
2177         }
2178
2179         req = aead_request_alloc(tfm, GFP_KERNEL);
2180         if (!req) {
2181                 cifs_dbg(VFS, "%s: Failed to alloc aead request", __func__);
2182                 return -ENOMEM;
2183         }
2184
2185         if (!enc) {
2186                 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
2187                 crypt_len += SMB2_SIGNATURE_SIZE;
2188         }
2189
2190         sg = init_sg(rqst, sign);
2191         if (!sg) {
2192                 cifs_dbg(VFS, "%s: Failed to init sg", __func__);
2193                 rc = -ENOMEM;
2194                 goto free_req;
2195         }
2196
2197         iv_len = crypto_aead_ivsize(tfm);
2198         iv = kzalloc(iv_len, GFP_KERNEL);
2199         if (!iv) {
2200                 cifs_dbg(VFS, "%s: Failed to alloc IV", __func__);
2201                 rc = -ENOMEM;
2202                 goto free_sg;
2203         }
2204         iv[0] = 3;
2205         memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
2206
2207         aead_request_set_crypt(req, sg, sg, crypt_len, iv);
2208         aead_request_set_ad(req, assoc_data_len);
2209
2210         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
2211                                   cifs_crypt_complete, &result);
2212
2213         rc = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req);
2214
2215         if (rc == -EINPROGRESS || rc == -EBUSY) {
2216                 wait_for_completion(&result.completion);
2217                 rc = result.err;
2218         }
2219
2220         if (!rc && enc)
2221                 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
2222
2223         kfree(iv);
2224 free_sg:
2225         kfree(sg);
2226 free_req:
2227         kfree(req);
2228         return rc;
2229 }
2230
2231 static int
2232 smb3_init_transform_rq(struct TCP_Server_Info *server, struct smb_rqst *new_rq,
2233                        struct smb_rqst *old_rq)
2234 {
2235         struct kvec *iov;
2236         struct page **pages;
2237         struct smb2_transform_hdr *tr_hdr;
2238         unsigned int npages = old_rq->rq_npages;
2239         int i;
2240         int rc = -ENOMEM;
2241
2242         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
2243         if (!pages)
2244                 return rc;
2245
2246         new_rq->rq_pages = pages;
2247         new_rq->rq_npages = old_rq->rq_npages;
2248         new_rq->rq_pagesz = old_rq->rq_pagesz;
2249         new_rq->rq_tailsz = old_rq->rq_tailsz;
2250
2251         for (i = 0; i < npages; i++) {
2252                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2253                 if (!pages[i])
2254                         goto err_free_pages;
2255         }
2256
2257         iov = kmalloc_array(old_rq->rq_nvec, sizeof(struct kvec), GFP_KERNEL);
2258         if (!iov)
2259                 goto err_free_pages;
2260
2261         /* copy all iovs from the old except the 1st one (rfc1002 length) */
2262         memcpy(&iov[1], &old_rq->rq_iov[1],
2263                                 sizeof(struct kvec) * (old_rq->rq_nvec - 1));
2264         new_rq->rq_iov = iov;
2265         new_rq->rq_nvec = old_rq->rq_nvec;
2266
2267         tr_hdr = kmalloc(sizeof(struct smb2_transform_hdr), GFP_KERNEL);
2268         if (!tr_hdr)
2269                 goto err_free_iov;
2270
2271         /* fill the 1st iov with a transform header */
2272         fill_transform_hdr(tr_hdr, old_rq);
2273         new_rq->rq_iov[0].iov_base = tr_hdr;
2274         new_rq->rq_iov[0].iov_len = sizeof(struct smb2_transform_hdr);
2275
2276         /* copy pages form the old */
2277         for (i = 0; i < npages; i++) {
2278                 char *dst = kmap(new_rq->rq_pages[i]);
2279                 char *src = kmap(old_rq->rq_pages[i]);
2280                 unsigned int len = (i < npages - 1) ? new_rq->rq_pagesz :
2281                                                         new_rq->rq_tailsz;
2282                 memcpy(dst, src, len);
2283                 kunmap(new_rq->rq_pages[i]);
2284                 kunmap(old_rq->rq_pages[i]);
2285         }
2286
2287         rc = crypt_message(server, new_rq, 1);
2288         cifs_dbg(FYI, "encrypt message returned %d", rc);
2289         if (rc)
2290                 goto err_free_tr_hdr;
2291
2292         return rc;
2293
2294 err_free_tr_hdr:
2295         kfree(tr_hdr);
2296 err_free_iov:
2297         kfree(iov);
2298 err_free_pages:
2299         for (i = i - 1; i >= 0; i--)
2300                 put_page(pages[i]);
2301         kfree(pages);
2302         return rc;
2303 }
2304
2305 static void
2306 smb3_free_transform_rq(struct smb_rqst *rqst)
2307 {
2308         int i = rqst->rq_npages - 1;
2309
2310         for (; i >= 0; i--)
2311                 put_page(rqst->rq_pages[i]);
2312         kfree(rqst->rq_pages);
2313         /* free transform header */
2314         kfree(rqst->rq_iov[0].iov_base);
2315         kfree(rqst->rq_iov);
2316 }
2317
2318 static int
2319 smb3_is_transform_hdr(void *buf)
2320 {
2321         struct smb2_transform_hdr *trhdr = buf;
2322
2323         return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
2324 }
2325
2326 static int
2327 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
2328                  unsigned int buf_data_size, struct page **pages,
2329                  unsigned int npages, unsigned int page_data_size)
2330 {
2331         struct kvec iov[2];
2332         struct smb_rqst rqst = {NULL};
2333         struct smb2_hdr *hdr;
2334         int rc;
2335
2336         iov[0].iov_base = buf;
2337         iov[0].iov_len = sizeof(struct smb2_transform_hdr);
2338         iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
2339         iov[1].iov_len = buf_data_size;
2340
2341         rqst.rq_iov = iov;
2342         rqst.rq_nvec = 2;
2343         rqst.rq_pages = pages;
2344         rqst.rq_npages = npages;
2345         rqst.rq_pagesz = PAGE_SIZE;
2346         rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
2347
2348         rc = crypt_message(server, &rqst, 0);
2349         cifs_dbg(FYI, "decrypt message returned %d\n", rc);
2350
2351         if (rc)
2352                 return rc;
2353
2354         memmove(buf + 4, iov[1].iov_base, buf_data_size);
2355         hdr = (struct smb2_hdr *)buf;
2356         hdr->smb2_buf_length = cpu_to_be32(buf_data_size + page_data_size);
2357         server->total_read = buf_data_size + page_data_size + 4;
2358
2359         return rc;
2360 }
2361
2362 static int
2363 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
2364                      unsigned int npages, unsigned int len)
2365 {
2366         int i;
2367         int length;
2368
2369         for (i = 0; i < npages; i++) {
2370                 struct page *page = pages[i];
2371                 size_t n;
2372
2373                 n = len;
2374                 if (len >= PAGE_SIZE) {
2375                         /* enough data to fill the page */
2376                         n = PAGE_SIZE;
2377                         len -= n;
2378                 } else {
2379                         zero_user(page, len, PAGE_SIZE - len);
2380                         len = 0;
2381                 }
2382                 length = cifs_read_page_from_socket(server, page, n);
2383                 if (length < 0)
2384                         return length;
2385                 server->total_read += length;
2386         }
2387
2388         return 0;
2389 }
2390
2391 static int
2392 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
2393                unsigned int cur_off, struct bio_vec **page_vec)
2394 {
2395         struct bio_vec *bvec;
2396         int i;
2397
2398         bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
2399         if (!bvec)
2400                 return -ENOMEM;
2401
2402         for (i = 0; i < npages; i++) {
2403                 bvec[i].bv_page = pages[i];
2404                 bvec[i].bv_offset = (i == 0) ? cur_off : 0;
2405                 bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
2406                 data_size -= bvec[i].bv_len;
2407         }
2408
2409         if (data_size != 0) {
2410                 cifs_dbg(VFS, "%s: something went wrong\n", __func__);
2411                 kfree(bvec);
2412                 return -EIO;
2413         }
2414
2415         *page_vec = bvec;
2416         return 0;
2417 }
2418
2419 static int
2420 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
2421                  char *buf, unsigned int buf_len, struct page **pages,
2422                  unsigned int npages, unsigned int page_data_size)
2423 {
2424         unsigned int data_offset;
2425         unsigned int data_len;
2426         unsigned int cur_off;
2427         unsigned int cur_page_idx;
2428         unsigned int pad_len;
2429         struct cifs_readdata *rdata = mid->callback_data;
2430         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
2431         struct bio_vec *bvec = NULL;
2432         struct iov_iter iter;
2433         struct kvec iov;
2434         int length;
2435
2436         if (shdr->Command != SMB2_READ) {
2437                 cifs_dbg(VFS, "only big read responses are supported\n");
2438                 return -ENOTSUPP;
2439         }
2440
2441         if (server->ops->is_session_expired &&
2442             server->ops->is_session_expired(buf)) {
2443                 cifs_reconnect(server);
2444                 wake_up(&server->response_q);
2445                 return -1;
2446         }
2447
2448         if (server->ops->is_status_pending &&
2449                         server->ops->is_status_pending(buf, server, 0))
2450                 return -1;
2451
2452         rdata->result = server->ops->map_error(buf, false);
2453         if (rdata->result != 0) {
2454                 cifs_dbg(FYI, "%s: server returned error %d\n",
2455                          __func__, rdata->result);
2456                 dequeue_mid(mid, rdata->result);
2457                 return 0;
2458         }
2459
2460         data_offset = server->ops->read_data_offset(buf) + 4;
2461         data_len = server->ops->read_data_length(buf);
2462
2463         if (data_offset < server->vals->read_rsp_size) {
2464                 /*
2465                  * win2k8 sometimes sends an offset of 0 when the read
2466                  * is beyond the EOF. Treat it as if the data starts just after
2467                  * the header.
2468                  */
2469                 cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
2470                          __func__, data_offset);
2471                 data_offset = server->vals->read_rsp_size;
2472         } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
2473                 /* data_offset is beyond the end of smallbuf */
2474                 cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
2475                          __func__, data_offset);
2476                 rdata->result = -EIO;
2477                 dequeue_mid(mid, rdata->result);
2478                 return 0;
2479         }
2480
2481         pad_len = data_offset - server->vals->read_rsp_size;
2482
2483         if (buf_len <= data_offset) {
2484                 /* read response payload is in pages */
2485                 cur_page_idx = pad_len / PAGE_SIZE;
2486                 cur_off = pad_len % PAGE_SIZE;
2487
2488                 if (cur_page_idx != 0) {
2489                         /* data offset is beyond the 1st page of response */
2490                         cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
2491                                  __func__, data_offset);
2492                         rdata->result = -EIO;
2493                         dequeue_mid(mid, rdata->result);
2494                         return 0;
2495                 }
2496
2497                 if (data_len > page_data_size - pad_len) {
2498                         /* data_len is corrupt -- discard frame */
2499                         rdata->result = -EIO;
2500                         dequeue_mid(mid, rdata->result);
2501                         return 0;
2502                 }
2503
2504                 rdata->result = init_read_bvec(pages, npages, page_data_size,
2505                                                cur_off, &bvec);
2506                 if (rdata->result != 0) {
2507                         dequeue_mid(mid, rdata->result);
2508                         return 0;
2509                 }
2510
2511                 iov_iter_bvec(&iter, WRITE | ITER_BVEC, bvec, npages, data_len);
2512         } else if (buf_len >= data_offset + data_len) {
2513                 /* read response payload is in buf */
2514                 WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
2515                 iov.iov_base = buf + data_offset;
2516                 iov.iov_len = data_len;
2517                 iov_iter_kvec(&iter, WRITE | ITER_KVEC, &iov, 1, data_len);
2518         } else {
2519                 /* read response payload cannot be in both buf and pages */
2520                 WARN_ONCE(1, "buf can not contain only a part of read data");
2521                 rdata->result = -EIO;
2522                 dequeue_mid(mid, rdata->result);
2523                 return 0;
2524         }
2525
2526         /* set up first iov for signature check */
2527         rdata->iov[0].iov_base = buf;
2528         rdata->iov[0].iov_len = 4;
2529         rdata->iov[1].iov_base = buf + 4;
2530         rdata->iov[1].iov_len = server->vals->read_rsp_size - 4;
2531         cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
2532                  rdata->iov[0].iov_base, server->vals->read_rsp_size);
2533
2534         length = rdata->copy_into_pages(server, rdata, &iter);
2535
2536         kfree(bvec);
2537
2538         if (length < 0)
2539                 return length;
2540
2541         dequeue_mid(mid, false);
2542         return length;
2543 }
2544
2545 static int
2546 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
2547 {
2548         char *buf = server->smallbuf;
2549         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
2550         unsigned int npages;
2551         struct page **pages;
2552         unsigned int len;
2553         unsigned int buflen = get_rfc1002_length(buf) + 4;
2554         int rc;
2555         int i = 0;
2556
2557         len = min_t(unsigned int, buflen, server->vals->read_rsp_size - 4 +
2558                 sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
2559
2560         rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
2561         if (rc < 0)
2562                 return rc;
2563         server->total_read += rc;
2564
2565         len = le32_to_cpu(tr_hdr->OriginalMessageSize) + 4 -
2566                                                 server->vals->read_rsp_size;
2567         npages = DIV_ROUND_UP(len, PAGE_SIZE);
2568
2569         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
2570         if (!pages) {
2571                 rc = -ENOMEM;
2572                 goto discard_data;
2573         }
2574
2575         for (; i < npages; i++) {
2576                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2577                 if (!pages[i]) {
2578                         rc = -ENOMEM;
2579                         goto discard_data;
2580                 }
2581         }
2582
2583         /* read read data into pages */
2584         rc = read_data_into_pages(server, pages, npages, len);
2585         if (rc)
2586                 goto free_pages;
2587
2588         rc = cifs_discard_remaining_data(server);
2589         if (rc)
2590                 goto free_pages;
2591
2592         rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size - 4,
2593                               pages, npages, len);
2594         if (rc)
2595                 goto free_pages;
2596
2597         *mid = smb2_find_mid(server, buf);
2598         if (*mid == NULL)
2599                 cifs_dbg(FYI, "mid not found\n");
2600         else {
2601                 cifs_dbg(FYI, "mid found\n");
2602                 (*mid)->decrypted = true;
2603                 rc = handle_read_data(server, *mid, buf,
2604                                       server->vals->read_rsp_size,
2605                                       pages, npages, len);
2606         }
2607
2608 free_pages:
2609         for (i = i - 1; i >= 0; i--)
2610                 put_page(pages[i]);
2611         kfree(pages);
2612         return rc;
2613 discard_data:
2614         cifs_discard_remaining_data(server);
2615         goto free_pages;
2616 }
2617
2618 static int
2619 receive_encrypted_standard(struct TCP_Server_Info *server,
2620                            struct mid_q_entry **mid)
2621 {
2622         int length;
2623         char *buf = server->smallbuf;
2624         unsigned int pdu_length = get_rfc1002_length(buf);
2625         unsigned int buf_size;
2626         struct mid_q_entry *mid_entry;
2627
2628         /* switch to large buffer if too big for a small one */
2629         if (pdu_length + 4 > MAX_CIFS_SMALL_BUFFER_SIZE) {
2630                 server->large_buf = true;
2631                 memcpy(server->bigbuf, buf, server->total_read);
2632                 buf = server->bigbuf;
2633         }
2634
2635         /* now read the rest */
2636         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
2637                                 pdu_length - HEADER_SIZE(server) + 1 + 4);
2638         if (length < 0)
2639                 return length;
2640         server->total_read += length;
2641
2642         buf_size = pdu_length + 4 - sizeof(struct smb2_transform_hdr);
2643         length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0);
2644         if (length)
2645                 return length;
2646
2647         mid_entry = smb2_find_mid(server, buf);
2648         if (mid_entry == NULL)
2649                 cifs_dbg(FYI, "mid not found\n");
2650         else {
2651                 cifs_dbg(FYI, "mid found\n");
2652                 mid_entry->decrypted = true;
2653         }
2654
2655         *mid = mid_entry;
2656
2657         if (mid_entry && mid_entry->handle)
2658                 return mid_entry->handle(server, mid_entry);
2659
2660         return cifs_handle_standard(server, mid_entry);
2661 }
2662
2663 static int
2664 smb3_receive_transform(struct TCP_Server_Info *server, struct mid_q_entry **mid)
2665 {
2666         char *buf = server->smallbuf;
2667         unsigned int pdu_length = get_rfc1002_length(buf);
2668         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
2669         unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
2670
2671         if (pdu_length + 4 < sizeof(struct smb2_transform_hdr) +
2672                                                 sizeof(struct smb2_sync_hdr)) {
2673                 cifs_dbg(VFS, "Transform message is too small (%u)\n",
2674                          pdu_length);
2675                 cifs_reconnect(server);
2676                 wake_up(&server->response_q);
2677                 return -ECONNABORTED;
2678         }
2679
2680         if (pdu_length + 4 < orig_len + sizeof(struct smb2_transform_hdr)) {
2681                 cifs_dbg(VFS, "Transform message is broken\n");
2682                 cifs_reconnect(server);
2683                 wake_up(&server->response_q);
2684                 return -ECONNABORTED;
2685         }
2686
2687         if (pdu_length + 4 > CIFSMaxBufSize + MAX_HEADER_SIZE(server))
2688                 return receive_encrypted_read(server, mid);
2689
2690         return receive_encrypted_standard(server, mid);
2691 }
2692
2693 int
2694 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
2695 {
2696         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
2697
2698         return handle_read_data(server, mid, buf, get_rfc1002_length(buf) + 4,
2699                                 NULL, 0, 0);
2700 }
2701
2702 struct smb_version_operations smb20_operations = {
2703         .compare_fids = smb2_compare_fids,
2704         .setup_request = smb2_setup_request,
2705         .setup_async_request = smb2_setup_async_request,
2706         .check_receive = smb2_check_receive,
2707         .add_credits = smb2_add_credits,
2708         .set_credits = smb2_set_credits,
2709         .get_credits_field = smb2_get_credits_field,
2710         .get_credits = smb2_get_credits,
2711         .wait_mtu_credits = cifs_wait_mtu_credits,
2712         .get_next_mid = smb2_get_next_mid,
2713         .read_data_offset = smb2_read_data_offset,
2714         .read_data_length = smb2_read_data_length,
2715         .map_error = map_smb2_to_linux_error,
2716         .find_mid = smb2_find_mid,
2717         .check_message = smb2_check_message,
2718         .dump_detail = smb2_dump_detail,
2719         .clear_stats = smb2_clear_stats,
2720         .print_stats = smb2_print_stats,
2721         .is_oplock_break = smb2_is_valid_oplock_break,
2722         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2723         .downgrade_oplock = smb2_downgrade_oplock,
2724         .need_neg = smb2_need_neg,
2725         .negotiate = smb2_negotiate,
2726         .negotiate_wsize = smb2_negotiate_wsize,
2727         .negotiate_rsize = smb2_negotiate_rsize,
2728         .sess_setup = SMB2_sess_setup,
2729         .logoff = SMB2_logoff,
2730         .tree_connect = SMB2_tcon,
2731         .tree_disconnect = SMB2_tdis,
2732         .qfs_tcon = smb2_qfs_tcon,
2733         .is_path_accessible = smb2_is_path_accessible,
2734         .can_echo = smb2_can_echo,
2735         .echo = SMB2_echo,
2736         .query_path_info = smb2_query_path_info,
2737         .get_srv_inum = smb2_get_srv_inum,
2738         .query_file_info = smb2_query_file_info,
2739         .set_path_size = smb2_set_path_size,
2740         .set_file_size = smb2_set_file_size,
2741         .set_file_info = smb2_set_file_info,
2742         .set_compression = smb2_set_compression,
2743         .mkdir = smb2_mkdir,
2744         .mkdir_setinfo = smb2_mkdir_setinfo,
2745         .rmdir = smb2_rmdir,
2746         .unlink = smb2_unlink,
2747         .rename = smb2_rename_path,
2748         .create_hardlink = smb2_create_hardlink,
2749         .query_symlink = smb2_query_symlink,
2750         .query_mf_symlink = smb3_query_mf_symlink,
2751         .create_mf_symlink = smb3_create_mf_symlink,
2752         .open = smb2_open_file,
2753         .set_fid = smb2_set_fid,
2754         .close = smb2_close_file,
2755         .flush = smb2_flush_file,
2756         .async_readv = smb2_async_readv,
2757         .async_writev = smb2_async_writev,
2758         .sync_read = smb2_sync_read,
2759         .sync_write = smb2_sync_write,
2760         .query_dir_first = smb2_query_dir_first,
2761         .query_dir_next = smb2_query_dir_next,
2762         .close_dir = smb2_close_dir,
2763         .calc_smb_size = smb2_calc_size,
2764         .is_status_pending = smb2_is_status_pending,
2765         .is_session_expired = smb2_is_session_expired,
2766         .oplock_response = smb2_oplock_response,
2767         .queryfs = smb2_queryfs,
2768         .mand_lock = smb2_mand_lock,
2769         .mand_unlock_range = smb2_unlock_range,
2770         .push_mand_locks = smb2_push_mandatory_locks,
2771         .get_lease_key = smb2_get_lease_key,
2772         .set_lease_key = smb2_set_lease_key,
2773         .new_lease_key = smb2_new_lease_key,
2774         .calc_signature = smb2_calc_signature,
2775         .is_read_op = smb2_is_read_op,
2776         .set_oplock_level = smb2_set_oplock_level,
2777         .create_lease_buf = smb2_create_lease_buf,
2778         .parse_lease_buf = smb2_parse_lease_buf,
2779         .copychunk_range = smb2_copychunk_range,
2780         .wp_retry_size = smb2_wp_retry_size,
2781         .dir_needs_close = smb2_dir_needs_close,
2782         .get_dfs_refer = smb2_get_dfs_refer,
2783         .select_sectype = smb2_select_sectype,
2784 #ifdef CONFIG_CIFS_XATTR
2785         .query_all_EAs = smb2_query_eas,
2786         .set_EA = smb2_set_ea,
2787 #endif /* CIFS_XATTR */
2788 #ifdef CONFIG_CIFS_ACL
2789         .get_acl = get_smb2_acl,
2790         .get_acl_by_fid = get_smb2_acl_by_fid,
2791         .set_acl = set_smb2_acl,
2792 #endif /* CIFS_ACL */
2793 };
2794
2795 struct smb_version_operations smb21_operations = {
2796         .compare_fids = smb2_compare_fids,
2797         .setup_request = smb2_setup_request,
2798         .setup_async_request = smb2_setup_async_request,
2799         .check_receive = smb2_check_receive,
2800         .add_credits = smb2_add_credits,
2801         .set_credits = smb2_set_credits,
2802         .get_credits_field = smb2_get_credits_field,
2803         .get_credits = smb2_get_credits,
2804         .wait_mtu_credits = smb2_wait_mtu_credits,
2805         .get_next_mid = smb2_get_next_mid,
2806         .read_data_offset = smb2_read_data_offset,
2807         .read_data_length = smb2_read_data_length,
2808         .map_error = map_smb2_to_linux_error,
2809         .find_mid = smb2_find_mid,
2810         .check_message = smb2_check_message,
2811         .dump_detail = smb2_dump_detail,
2812         .clear_stats = smb2_clear_stats,
2813         .print_stats = smb2_print_stats,
2814         .is_oplock_break = smb2_is_valid_oplock_break,
2815         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2816         .downgrade_oplock = smb2_downgrade_oplock,
2817         .need_neg = smb2_need_neg,
2818         .negotiate = smb2_negotiate,
2819         .negotiate_wsize = smb2_negotiate_wsize,
2820         .negotiate_rsize = smb2_negotiate_rsize,
2821         .sess_setup = SMB2_sess_setup,
2822         .logoff = SMB2_logoff,
2823         .tree_connect = SMB2_tcon,
2824         .tree_disconnect = SMB2_tdis,
2825         .qfs_tcon = smb2_qfs_tcon,
2826         .is_path_accessible = smb2_is_path_accessible,
2827         .can_echo = smb2_can_echo,
2828         .echo = SMB2_echo,
2829         .query_path_info = smb2_query_path_info,
2830         .get_srv_inum = smb2_get_srv_inum,
2831         .query_file_info = smb2_query_file_info,
2832         .set_path_size = smb2_set_path_size,
2833         .set_file_size = smb2_set_file_size,
2834         .set_file_info = smb2_set_file_info,
2835         .set_compression = smb2_set_compression,
2836         .mkdir = smb2_mkdir,
2837         .mkdir_setinfo = smb2_mkdir_setinfo,
2838         .rmdir = smb2_rmdir,
2839         .unlink = smb2_unlink,
2840         .rename = smb2_rename_path,
2841         .create_hardlink = smb2_create_hardlink,
2842         .query_symlink = smb2_query_symlink,
2843         .query_mf_symlink = smb3_query_mf_symlink,
2844         .create_mf_symlink = smb3_create_mf_symlink,
2845         .open = smb2_open_file,
2846         .set_fid = smb2_set_fid,
2847         .close = smb2_close_file,
2848         .flush = smb2_flush_file,
2849         .async_readv = smb2_async_readv,
2850         .async_writev = smb2_async_writev,
2851         .sync_read = smb2_sync_read,
2852         .sync_write = smb2_sync_write,
2853         .query_dir_first = smb2_query_dir_first,
2854         .query_dir_next = smb2_query_dir_next,
2855         .close_dir = smb2_close_dir,
2856         .calc_smb_size = smb2_calc_size,
2857         .is_status_pending = smb2_is_status_pending,
2858         .is_session_expired = smb2_is_session_expired,
2859         .oplock_response = smb2_oplock_response,
2860         .queryfs = smb2_queryfs,
2861         .mand_lock = smb2_mand_lock,
2862         .mand_unlock_range = smb2_unlock_range,
2863         .push_mand_locks = smb2_push_mandatory_locks,
2864         .get_lease_key = smb2_get_lease_key,
2865         .set_lease_key = smb2_set_lease_key,
2866         .new_lease_key = smb2_new_lease_key,
2867         .calc_signature = smb2_calc_signature,
2868         .is_read_op = smb21_is_read_op,
2869         .set_oplock_level = smb21_set_oplock_level,
2870         .create_lease_buf = smb2_create_lease_buf,
2871         .parse_lease_buf = smb2_parse_lease_buf,
2872         .copychunk_range = smb2_copychunk_range,
2873         .wp_retry_size = smb2_wp_retry_size,
2874         .dir_needs_close = smb2_dir_needs_close,
2875         .enum_snapshots = smb3_enum_snapshots,
2876         .get_dfs_refer = smb2_get_dfs_refer,
2877         .select_sectype = smb2_select_sectype,
2878 #ifdef CONFIG_CIFS_XATTR
2879         .query_all_EAs = smb2_query_eas,
2880         .set_EA = smb2_set_ea,
2881 #endif /* CIFS_XATTR */
2882 #ifdef CONFIG_CIFS_ACL
2883         .get_acl = get_smb2_acl,
2884         .get_acl_by_fid = get_smb2_acl_by_fid,
2885         .set_acl = set_smb2_acl,
2886 #endif /* CIFS_ACL */
2887 };
2888
2889 struct smb_version_operations smb30_operations = {
2890         .compare_fids = smb2_compare_fids,
2891         .setup_request = smb2_setup_request,
2892         .setup_async_request = smb2_setup_async_request,
2893         .check_receive = smb2_check_receive,
2894         .add_credits = smb2_add_credits,
2895         .set_credits = smb2_set_credits,
2896         .get_credits_field = smb2_get_credits_field,
2897         .get_credits = smb2_get_credits,
2898         .wait_mtu_credits = smb2_wait_mtu_credits,
2899         .get_next_mid = smb2_get_next_mid,
2900         .read_data_offset = smb2_read_data_offset,
2901         .read_data_length = smb2_read_data_length,
2902         .map_error = map_smb2_to_linux_error,
2903         .find_mid = smb2_find_mid,
2904         .check_message = smb2_check_message,
2905         .dump_detail = smb2_dump_detail,
2906         .clear_stats = smb2_clear_stats,
2907         .print_stats = smb2_print_stats,
2908         .dump_share_caps = smb2_dump_share_caps,
2909         .is_oplock_break = smb2_is_valid_oplock_break,
2910         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2911         .downgrade_oplock = smb2_downgrade_oplock,
2912         .need_neg = smb2_need_neg,
2913         .negotiate = smb2_negotiate,
2914         .negotiate_wsize = smb2_negotiate_wsize,
2915         .negotiate_rsize = smb2_negotiate_rsize,
2916         .sess_setup = SMB2_sess_setup,
2917         .logoff = SMB2_logoff,
2918         .tree_connect = SMB2_tcon,
2919         .tree_disconnect = SMB2_tdis,
2920         .qfs_tcon = smb3_qfs_tcon,
2921         .is_path_accessible = smb2_is_path_accessible,
2922         .can_echo = smb2_can_echo,
2923         .echo = SMB2_echo,
2924         .query_path_info = smb2_query_path_info,
2925         .get_srv_inum = smb2_get_srv_inum,
2926         .query_file_info = smb2_query_file_info,
2927         .set_path_size = smb2_set_path_size,
2928         .set_file_size = smb2_set_file_size,
2929         .set_file_info = smb2_set_file_info,
2930         .set_compression = smb2_set_compression,
2931         .mkdir = smb2_mkdir,
2932         .mkdir_setinfo = smb2_mkdir_setinfo,
2933         .rmdir = smb2_rmdir,
2934         .unlink = smb2_unlink,
2935         .rename = smb2_rename_path,
2936         .create_hardlink = smb2_create_hardlink,
2937         .query_symlink = smb2_query_symlink,
2938         .query_mf_symlink = smb3_query_mf_symlink,
2939         .create_mf_symlink = smb3_create_mf_symlink,
2940         .open = smb2_open_file,
2941         .set_fid = smb2_set_fid,
2942         .close = smb2_close_file,
2943         .flush = smb2_flush_file,
2944         .async_readv = smb2_async_readv,
2945         .async_writev = smb2_async_writev,
2946         .sync_read = smb2_sync_read,
2947         .sync_write = smb2_sync_write,
2948         .query_dir_first = smb2_query_dir_first,
2949         .query_dir_next = smb2_query_dir_next,
2950         .close_dir = smb2_close_dir,
2951         .calc_smb_size = smb2_calc_size,
2952         .is_status_pending = smb2_is_status_pending,
2953         .is_session_expired = smb2_is_session_expired,
2954         .oplock_response = smb2_oplock_response,
2955         .queryfs = smb2_queryfs,
2956         .mand_lock = smb2_mand_lock,
2957         .mand_unlock_range = smb2_unlock_range,
2958         .push_mand_locks = smb2_push_mandatory_locks,
2959         .get_lease_key = smb2_get_lease_key,
2960         .set_lease_key = smb2_set_lease_key,
2961         .new_lease_key = smb2_new_lease_key,
2962         .generate_signingkey = generate_smb30signingkey,
2963         .calc_signature = smb3_calc_signature,
2964         .set_integrity  = smb3_set_integrity,
2965         .is_read_op = smb21_is_read_op,
2966         .set_oplock_level = smb3_set_oplock_level,
2967         .create_lease_buf = smb3_create_lease_buf,
2968         .parse_lease_buf = smb3_parse_lease_buf,
2969         .copychunk_range = smb2_copychunk_range,
2970         .duplicate_extents = smb2_duplicate_extents,
2971         .validate_negotiate = smb3_validate_negotiate,
2972         .wp_retry_size = smb2_wp_retry_size,
2973         .dir_needs_close = smb2_dir_needs_close,
2974         .fallocate = smb3_fallocate,
2975         .enum_snapshots = smb3_enum_snapshots,
2976         .init_transform_rq = smb3_init_transform_rq,
2977         .free_transform_rq = smb3_free_transform_rq,
2978         .is_transform_hdr = smb3_is_transform_hdr,
2979         .receive_transform = smb3_receive_transform,
2980         .get_dfs_refer = smb2_get_dfs_refer,
2981         .select_sectype = smb2_select_sectype,
2982 #ifdef CONFIG_CIFS_XATTR
2983         .query_all_EAs = smb2_query_eas,
2984         .set_EA = smb2_set_ea,
2985 #endif /* CIFS_XATTR */
2986 #ifdef CONFIG_CIFS_ACL
2987         .get_acl = get_smb2_acl,
2988         .get_acl_by_fid = get_smb2_acl_by_fid,
2989         .set_acl = set_smb2_acl,
2990 #endif /* CIFS_ACL */
2991 };
2992
2993 #ifdef CONFIG_CIFS_SMB311
2994 struct smb_version_operations smb311_operations = {
2995         .compare_fids = smb2_compare_fids,
2996         .setup_request = smb2_setup_request,
2997         .setup_async_request = smb2_setup_async_request,
2998         .check_receive = smb2_check_receive,
2999         .add_credits = smb2_add_credits,
3000         .set_credits = smb2_set_credits,
3001         .get_credits_field = smb2_get_credits_field,
3002         .get_credits = smb2_get_credits,
3003         .wait_mtu_credits = smb2_wait_mtu_credits,
3004         .get_next_mid = smb2_get_next_mid,
3005         .read_data_offset = smb2_read_data_offset,
3006         .read_data_length = smb2_read_data_length,
3007         .map_error = map_smb2_to_linux_error,
3008         .find_mid = smb2_find_mid,
3009         .check_message = smb2_check_message,
3010         .dump_detail = smb2_dump_detail,
3011         .clear_stats = smb2_clear_stats,
3012         .print_stats = smb2_print_stats,
3013         .dump_share_caps = smb2_dump_share_caps,
3014         .is_oplock_break = smb2_is_valid_oplock_break,
3015         .handle_cancelled_mid = smb2_handle_cancelled_mid,
3016         .downgrade_oplock = smb2_downgrade_oplock,
3017         .need_neg = smb2_need_neg,
3018         .negotiate = smb2_negotiate,
3019         .negotiate_wsize = smb2_negotiate_wsize,
3020         .negotiate_rsize = smb2_negotiate_rsize,
3021         .sess_setup = SMB2_sess_setup,
3022         .logoff = SMB2_logoff,
3023         .tree_connect = SMB2_tcon,
3024         .tree_disconnect = SMB2_tdis,
3025         .qfs_tcon = smb3_qfs_tcon,
3026         .is_path_accessible = smb2_is_path_accessible,
3027         .can_echo = smb2_can_echo,
3028         .echo = SMB2_echo,
3029         .query_path_info = smb2_query_path_info,
3030         .get_srv_inum = smb2_get_srv_inum,
3031         .query_file_info = smb2_query_file_info,
3032         .set_path_size = smb2_set_path_size,
3033         .set_file_size = smb2_set_file_size,
3034         .set_file_info = smb2_set_file_info,
3035         .set_compression = smb2_set_compression,
3036         .mkdir = smb2_mkdir,
3037         .mkdir_setinfo = smb2_mkdir_setinfo,
3038         .rmdir = smb2_rmdir,
3039         .unlink = smb2_unlink,
3040         .rename = smb2_rename_path,
3041         .create_hardlink = smb2_create_hardlink,
3042         .query_symlink = smb2_query_symlink,
3043         .query_mf_symlink = smb3_query_mf_symlink,
3044         .create_mf_symlink = smb3_create_mf_symlink,
3045         .open = smb2_open_file,
3046         .set_fid = smb2_set_fid,
3047         .close = smb2_close_file,
3048         .flush = smb2_flush_file,
3049         .async_readv = smb2_async_readv,
3050         .async_writev = smb2_async_writev,
3051         .sync_read = smb2_sync_read,
3052         .sync_write = smb2_sync_write,
3053         .query_dir_first = smb2_query_dir_first,
3054         .query_dir_next = smb2_query_dir_next,
3055         .close_dir = smb2_close_dir,
3056         .calc_smb_size = smb2_calc_size,
3057         .is_status_pending = smb2_is_status_pending,
3058         .is_session_expired = smb2_is_session_expired,
3059         .oplock_response = smb2_oplock_response,
3060         .queryfs = smb2_queryfs,
3061         .mand_lock = smb2_mand_lock,
3062         .mand_unlock_range = smb2_unlock_range,
3063         .push_mand_locks = smb2_push_mandatory_locks,
3064         .get_lease_key = smb2_get_lease_key,
3065         .set_lease_key = smb2_set_lease_key,
3066         .new_lease_key = smb2_new_lease_key,
3067         .generate_signingkey = generate_smb311signingkey,
3068         .calc_signature = smb3_calc_signature,
3069         .set_integrity  = smb3_set_integrity,
3070         .is_read_op = smb21_is_read_op,
3071         .set_oplock_level = smb3_set_oplock_level,
3072         .create_lease_buf = smb3_create_lease_buf,
3073         .parse_lease_buf = smb3_parse_lease_buf,
3074         .copychunk_range = smb2_copychunk_range,
3075         .duplicate_extents = smb2_duplicate_extents,
3076 /*      .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
3077         .wp_retry_size = smb2_wp_retry_size,
3078         .dir_needs_close = smb2_dir_needs_close,
3079         .fallocate = smb3_fallocate,
3080         .enum_snapshots = smb3_enum_snapshots,
3081         .init_transform_rq = smb3_init_transform_rq,
3082         .free_transform_rq = smb3_free_transform_rq,
3083         .is_transform_hdr = smb3_is_transform_hdr,
3084         .receive_transform = smb3_receive_transform,
3085         .get_dfs_refer = smb2_get_dfs_refer,
3086         .select_sectype = smb2_select_sectype,
3087 #ifdef CONFIG_CIFS_XATTR
3088         .query_all_EAs = smb2_query_eas,
3089         .set_EA = smb2_set_ea,
3090 #endif /* CIFS_XATTR */
3091 };
3092 #endif /* CIFS_SMB311 */
3093
3094 struct smb_version_values smb20_values = {
3095         .version_string = SMB20_VERSION_STRING,
3096         .protocol_id = SMB20_PROT_ID,
3097         .req_capabilities = 0, /* MBZ */
3098         .large_lock_type = 0,
3099         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3100         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3101         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3102         .header_size = sizeof(struct smb2_hdr),
3103         .max_header_size = MAX_SMB2_HDR_SIZE,
3104         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3105         .lock_cmd = SMB2_LOCK,
3106         .cap_unix = 0,
3107         .cap_nt_find = SMB2_NT_FIND,
3108         .cap_large_files = SMB2_LARGE_FILES,
3109         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3110         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3111         .create_lease_size = sizeof(struct create_lease),
3112 };
3113
3114 struct smb_version_values smb21_values = {
3115         .version_string = SMB21_VERSION_STRING,
3116         .protocol_id = SMB21_PROT_ID,
3117         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
3118         .large_lock_type = 0,
3119         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3120         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3121         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3122         .header_size = sizeof(struct smb2_hdr),
3123         .max_header_size = MAX_SMB2_HDR_SIZE,
3124         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3125         .lock_cmd = SMB2_LOCK,
3126         .cap_unix = 0,
3127         .cap_nt_find = SMB2_NT_FIND,
3128         .cap_large_files = SMB2_LARGE_FILES,
3129         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3130         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3131         .create_lease_size = sizeof(struct create_lease),
3132 };
3133
3134 struct smb_version_values smb3any_values = {
3135         .version_string = SMB3ANY_VERSION_STRING,
3136         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
3137         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
3138         .large_lock_type = 0,
3139         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3140         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3141         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3142         .header_size = sizeof(struct smb2_hdr),
3143         .max_header_size = MAX_SMB2_HDR_SIZE,
3144         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3145         .lock_cmd = SMB2_LOCK,
3146         .cap_unix = 0,
3147         .cap_nt_find = SMB2_NT_FIND,
3148         .cap_large_files = SMB2_LARGE_FILES,
3149         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3150         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3151         .create_lease_size = sizeof(struct create_lease_v2),
3152 };
3153
3154 struct smb_version_values smbdefault_values = {
3155         .version_string = SMBDEFAULT_VERSION_STRING,
3156         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
3157         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
3158         .large_lock_type = 0,
3159         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3160         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3161         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3162         .header_size = sizeof(struct smb2_hdr),
3163         .max_header_size = MAX_SMB2_HDR_SIZE,
3164         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3165         .lock_cmd = SMB2_LOCK,
3166         .cap_unix = 0,
3167         .cap_nt_find = SMB2_NT_FIND,
3168         .cap_large_files = SMB2_LARGE_FILES,
3169         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3170         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3171         .create_lease_size = sizeof(struct create_lease_v2),
3172 };
3173
3174 struct smb_version_values smb30_values = {
3175         .version_string = SMB30_VERSION_STRING,
3176         .protocol_id = SMB30_PROT_ID,
3177         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
3178         .large_lock_type = 0,
3179         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3180         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3181         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3182         .header_size = sizeof(struct smb2_hdr),
3183         .max_header_size = MAX_SMB2_HDR_SIZE,
3184         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3185         .lock_cmd = SMB2_LOCK,
3186         .cap_unix = 0,
3187         .cap_nt_find = SMB2_NT_FIND,
3188         .cap_large_files = SMB2_LARGE_FILES,
3189         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3190         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3191         .create_lease_size = sizeof(struct create_lease_v2),
3192 };
3193
3194 struct smb_version_values smb302_values = {
3195         .version_string = SMB302_VERSION_STRING,
3196         .protocol_id = SMB302_PROT_ID,
3197         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
3198         .large_lock_type = 0,
3199         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3200         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3201         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3202         .header_size = sizeof(struct smb2_hdr),
3203         .max_header_size = MAX_SMB2_HDR_SIZE,
3204         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3205         .lock_cmd = SMB2_LOCK,
3206         .cap_unix = 0,
3207         .cap_nt_find = SMB2_NT_FIND,
3208         .cap_large_files = SMB2_LARGE_FILES,
3209         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3210         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3211         .create_lease_size = sizeof(struct create_lease_v2),
3212 };
3213
3214 #ifdef CONFIG_CIFS_SMB311
3215 struct smb_version_values smb311_values = {
3216         .version_string = SMB311_VERSION_STRING,
3217         .protocol_id = SMB311_PROT_ID,
3218         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
3219         .large_lock_type = 0,
3220         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3221         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3222         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3223         .header_size = sizeof(struct smb2_hdr),
3224         .max_header_size = MAX_SMB2_HDR_SIZE,
3225         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3226         .lock_cmd = SMB2_LOCK,
3227         .cap_unix = 0,
3228         .cap_nt_find = SMB2_NT_FIND,
3229         .cap_large_files = SMB2_LARGE_FILES,
3230         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3231         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3232         .create_lease_size = sizeof(struct create_lease_v2),
3233 };
3234 #endif /* SMB311 */