LXR linux/fs/cifs/smb2misc.c

   1/*
   2 *   fs/cifs/smb2misc.c
   3 *
   4 *   Copyright (C) International Business Machines  Corp., 2002,2011
   5 *                 Etersoft, 2012
   6 *   Author(s): Steve French (sfrench@us.ibm.com)
   7 *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8 *
   9 *   This library is free software; you can redistribute it and/or modify
  10 *   it under the terms of the GNU Lesser General Public License as published
  11 *   by the Free Software Foundation; either version 2.1 of the License, or
  12 *   (at your option) any later version.
  13 *
  14 *   This library is distributed in the hope that it will be useful,
  15 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17 *   the GNU Lesser General Public License for more details.
  18 *
  19 *   You should have received a copy of the GNU Lesser General Public License
  20 *   along with this library; if not, write to the Free Software
  21 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22 */
  23#include <linux/ctype.h>
  24#include "smb2pdu.h"
  25#include "cifsglob.h"
  26#include "cifsproto.h"
  27#include "smb2proto.h"
  28#include "cifs_debug.h"
  29#include "cifs_unicode.h"
  30#include "smb2status.h"
  31
  32static int
  33check_smb2_hdr(struct smb2_hdr *hdr, __u64 mid)
  34{
  35        /*
  36         * Make sure that this really is an SMB, that it is a response,
  37         * and that the message ids match.
  38         */
  39        if ((*(__le32 *)hdr->ProtocolId == SMB2_PROTO_NUMBER) &&
  40            (mid == hdr->MessageId)) {
  41                if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
  42                        return 0;
  43                else {
  44                        /* only one valid case where server sends us request */
  45                        if (hdr->Command == SMB2_OPLOCK_BREAK)
  46                                return 0;
  47                        else
  48                                cERROR(1, "Received Request not response");
  49                }
  50        } else { /* bad signature or mid */
  51                if (*(__le32 *)hdr->ProtocolId != SMB2_PROTO_NUMBER)
  52                        cERROR(1, "Bad protocol string signature header %x",
  53                                  *(unsigned int *) hdr->ProtocolId);
  54                if (mid != hdr->MessageId)
  55                        cERROR(1, "Mids do not match: %llu and %llu", mid,
  56                                  hdr->MessageId);
  57        }
  58        cERROR(1, "Bad SMB detected. The Mid=%llu", hdr->MessageId);
  59        return 1;
  60}
  61
  62/*
  63 *  The following table defines the expected "StructureSize" of SMB2 responses
  64 *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS responses.
  65 *
  66 *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  67 *  indexed by command in host byte order
  68 */
  69static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  70        /* SMB2_NEGOTIATE */ __constant_cpu_to_le16(65),
  71        /* SMB2_SESSION_SETUP */ __constant_cpu_to_le16(9),
  72        /* SMB2_LOGOFF */ __constant_cpu_to_le16(4),
  73        /* SMB2_TREE_CONNECT */ __constant_cpu_to_le16(16),
  74        /* SMB2_TREE_DISCONNECT */ __constant_cpu_to_le16(4),
  75        /* SMB2_CREATE */ __constant_cpu_to_le16(89),
  76        /* SMB2_CLOSE */ __constant_cpu_to_le16(60),
  77        /* SMB2_FLUSH */ __constant_cpu_to_le16(4),
  78        /* SMB2_READ */ __constant_cpu_to_le16(17),
  79        /* SMB2_WRITE */ __constant_cpu_to_le16(17),
  80        /* SMB2_LOCK */ __constant_cpu_to_le16(4),
  81        /* SMB2_IOCTL */ __constant_cpu_to_le16(49),
  82        /* BB CHECK this ... not listed in documentation */
  83        /* SMB2_CANCEL */ __constant_cpu_to_le16(0),
  84        /* SMB2_ECHO */ __constant_cpu_to_le16(4),
  85        /* SMB2_QUERY_DIRECTORY */ __constant_cpu_to_le16(9),
  86        /* SMB2_CHANGE_NOTIFY */ __constant_cpu_to_le16(9),
  87        /* SMB2_QUERY_INFO */ __constant_cpu_to_le16(9),
  88        /* SMB2_SET_INFO */ __constant_cpu_to_le16(2),
  89        /* BB FIXME can also be 44 for lease break */
  90        /* SMB2_OPLOCK_BREAK */ __constant_cpu_to_le16(24)
  91};
  92
  93int
  94smb2_check_message(char *buf, unsigned int length)
  95{
  96        struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
  97        struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  98        __u64 mid = hdr->MessageId;
  99        __u32 len = get_rfc1002_length(buf);
 100        __u32 clc_len;  /* calculated length */
 101        int command;
 102
 103        /* BB disable following printk later */
 104        cFYI(1, "%s length: 0x%x, smb_buf_length: 0x%x", __func__, length, len);
 105
 106        /*
 107         * Add function to do table lookup of StructureSize by command
 108         * ie Validate the wct via smb2_struct_sizes table above
 109         */
 110
 111        if (length < sizeof(struct smb2_pdu)) {
 112                if ((length >= sizeof(struct smb2_hdr)) && (hdr->Status != 0)) {
 113                        pdu->StructureSize2 = 0;
 114                        /*
 115                         * As with SMB/CIFS, on some error cases servers may
 116                         * not return wct properly
 117                         */
 118                        return 0;
 119                } else {
 120                        cERROR(1, "Length less than SMB header size");
 121                }
 122                return 1;
 123        }
 124        if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE - 4) {
 125                cERROR(1, "SMB length greater than maximum, mid=%llu", mid);
 126                return 1;
 127        }
 128
 129        if (check_smb2_hdr(hdr, mid))
 130                return 1;
 131
 132        if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
 133                cERROR(1, "Illegal structure size %u",
 134                          le16_to_cpu(hdr->StructureSize));
 135                return 1;
 136        }
 137
 138        command = le16_to_cpu(hdr->Command);
 139        if (command >= NUMBER_OF_SMB2_COMMANDS) {
 140                cERROR(1, "Illegal SMB2 command %d", command);
 141                return 1;
 142        }
 143
 144        if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
 145                if (command != SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0 ||
 146                    pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
 147                        /* error packets have 9 byte structure size */
 148                        cERROR(1, "Illegal response size %u for command %d",
 149                                   le16_to_cpu(pdu->StructureSize2), command);
 150                        return 1;
 151                } else if (command == SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0)
 152                           && (le16_to_cpu(pdu->StructureSize2) != 44)
 153                           && (le16_to_cpu(pdu->StructureSize2) != 36)) {
 154                        /* special case for SMB2.1 lease break message */
 155                        cERROR(1, "Illegal response size %d for oplock break",
 156                                   le16_to_cpu(pdu->StructureSize2));
 157                        return 1;
 158                }
 159        }
 160
 161        if (4 + len != length) {
 162                cERROR(1, "Total length %u RFC1002 length %u mismatch mid %llu",
 163                          length, 4 + len, mid);
 164                return 1;
 165        }
 166
 167        clc_len = smb2_calc_size(hdr);
 168
 169        if (4 + len != clc_len) {
 170                cFYI(1, "Calculated size %u length %u mismatch mid %llu",
 171                        clc_len, 4 + len, mid);
 172                /* Windows 7 server returns 24 bytes more */
 173                if (clc_len + 20 == len && command == SMB2_OPLOCK_BREAK_HE)
 174                        return 0;
 175                /* server can return one byte more */
 176                if (clc_len == 4 + len + 1)
 177                        return 0;
 178                return 1;
 179        }
 180        return 0;
 181}
 182
 183/*
 184 * The size of the variable area depends on the offset and length fields
 185 * located in different fields for various SMB2 responses. SMB2 responses
 186 * with no variable length info, show an offset of zero for the offset field.
 187 */
 188static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
 189        /* SMB2_NEGOTIATE */ true,
 190        /* SMB2_SESSION_SETUP */ true,
 191        /* SMB2_LOGOFF */ false,
 192        /* SMB2_TREE_CONNECT */ false,
 193        /* SMB2_TREE_DISCONNECT */ false,
 194        /* SMB2_CREATE */ true,
 195        /* SMB2_CLOSE */ false,
 196        /* SMB2_FLUSH */ false,
 197        /* SMB2_READ */ true,
 198        /* SMB2_WRITE */ false,
 199        /* SMB2_LOCK */ false,
 200        /* SMB2_IOCTL */ true,
 201        /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
 202        /* SMB2_ECHO */ false,
 203        /* SMB2_QUERY_DIRECTORY */ true,
 204        /* SMB2_CHANGE_NOTIFY */ true,
 205        /* SMB2_QUERY_INFO */ true,
 206        /* SMB2_SET_INFO */ false,
 207        /* SMB2_OPLOCK_BREAK */ false
 208};
 209
 210/*
 211 * Returns the pointer to the beginning of the data area. Length of the data
 212 * area and the offset to it (from the beginning of the smb are also returned.
 213 */
 214char *
 215smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
 216{
 217        *off = 0;
 218        *len = 0;
 219
 220        /* error responses do not have data area */
 221        if (hdr->Status && hdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
 222            (((struct smb2_err_rsp *)hdr)->StructureSize) ==
 223                                                SMB2_ERROR_STRUCTURE_SIZE2)
 224                return NULL;
 225
 226        /*
 227         * Following commands have data areas so we have to get the location
 228         * of the data buffer offset and data buffer length for the particular
 229         * command.
 230         */
 231        switch (hdr->Command) {
 232        case SMB2_NEGOTIATE:
 233                *off = le16_to_cpu(
 234                    ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
 235                *len = le16_to_cpu(
 236                    ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
 237                break;
 238        case SMB2_SESSION_SETUP:
 239                *off = le16_to_cpu(
 240                    ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset);
 241                *len = le16_to_cpu(
 242                    ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
 243                break;
 244        case SMB2_CREATE:
 245                *off = le32_to_cpu(
 246                    ((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
 247                *len = le32_to_cpu(
 248                    ((struct smb2_create_rsp *)hdr)->CreateContextsLength);
 249                break;
 250        case SMB2_QUERY_INFO:
 251                *off = le16_to_cpu(
 252                    ((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset);
 253                *len = le32_to_cpu(
 254                    ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
 255                break;
 256        case SMB2_READ:
 257                *off = ((struct smb2_read_rsp *)hdr)->DataOffset;
 258                *len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
 259                break;
 260        case SMB2_QUERY_DIRECTORY:
 261                *off = le16_to_cpu(
 262                  ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
 263                *len = le32_to_cpu(
 264                  ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
 265                break;
 266        case SMB2_IOCTL:
 267        case SMB2_CHANGE_NOTIFY:
 268        default:
 269                /* BB FIXME for unimplemented cases above */
 270                cERROR(1, "no length check for command");
 271                break;
 272        }
 273
 274        /*
 275         * Invalid length or offset probably means data area is invalid, but
 276         * we have little choice but to ignore the data area in this case.
 277         */
 278        if (*off > 4096) {
 279                cERROR(1, "offset %d too large, data area ignored", *off);
 280                *len = 0;
 281                *off = 0;
 282        } else if (*off < 0) {
 283                cERROR(1, "negative offset %d to data invalid ignore data area",
 284                          *off);
 285                *off = 0;
 286                *len = 0;
 287        } else if (*len < 0) {
 288                cERROR(1, "negative data length %d invalid, data area ignored",
 289                          *len);
 290                *len = 0;
 291        } else if (*len > 128 * 1024) {
 292                cERROR(1, "data area larger than 128K: %d", *len);
 293                *len = 0;
 294        }
 295
 296        /* return pointer to beginning of data area, ie offset from SMB start */
 297        if ((*off != 0) && (*len != 0))
 298                return hdr->ProtocolId + *off;
 299        else
 300                return NULL;
 301}
 302
 303/*
 304 * Calculate the size of the SMB message based on the fixed header
 305 * portion, the number of word parameters and the data portion of the message.
 306 */
 307unsigned int
 308smb2_calc_size(void *buf)
 309{
 310        struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
 311        struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
 312        int offset; /* the offset from the beginning of SMB to data area */
 313        int data_length; /* the length of the variable length data area */
 314        /* Structure Size has already been checked to make sure it is 64 */
 315        int len = 4 + le16_to_cpu(pdu->hdr.StructureSize);
 316
 317        /*
 318         * StructureSize2, ie length of fixed parameter area has already
 319         * been checked to make sure it is the correct length.
 320         */
 321        len += le16_to_cpu(pdu->StructureSize2);
 322
 323        if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false)
 324                goto calc_size_exit;
 325
 326        smb2_get_data_area_len(&offset, &data_length, hdr);
 327        cFYI(1, "SMB2 data length %d offset %d", data_length, offset);
 328
 329        if (data_length > 0) {
 330                /*
 331                 * Check to make sure that data area begins after fixed area,
 332                 * Note that last byte of the fixed area is part of data area
 333                 * for some commands, typically those with odd StructureSize,
 334                 * so we must add one to the calculation (and 4 to account for
 335                 * the size of the RFC1001 hdr.
 336                 */
 337                if (offset + 4 + 1 < len) {
 338                        cERROR(1, "data area offset %d overlaps SMB2 header %d",
 339                                  offset + 4 + 1, len);
 340                        data_length = 0;
 341                } else {
 342                        len = 4 + offset + data_length;
 343                }
 344        }
 345calc_size_exit:
 346        cFYI(1, "SMB2 len %d", len);
 347        return len;
 348}
 349
 350/* Note: caller must free return buffer */
 351__le16 *
 352cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
 353{
 354        int len;
 355        const char *start_of_path;
 356        __le16 *to;
 357
 358        /* Windows doesn't allow paths beginning with \ */
 359        if (from[0] == '\\')
 360                start_of_path = from + 1;
 361        else
 362                start_of_path = from;
 363        to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
 364                                   cifs_sb->local_nls,
 365                                   cifs_sb->mnt_cifs_flags &
 366                                        CIFS_MOUNT_MAP_SPECIAL_CHR);
 367        return to;
 368}
 369
 370__le32
 371smb2_get_lease_state(struct cifsInodeInfo *cinode)
 372{
 373        if (cinode->clientCanCacheAll)
 374                return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
 375        else if (cinode->clientCanCacheRead)
 376                return SMB2_LEASE_READ_CACHING;
 377        return 0;
 378}
 379
 380__u8 smb2_map_lease_to_oplock(__le32 lease_state)
 381{
 382        if (lease_state & SMB2_LEASE_WRITE_CACHING) {
 383                if (lease_state & SMB2_LEASE_HANDLE_CACHING)
 384                        return SMB2_OPLOCK_LEVEL_BATCH;
 385                else
 386                        return SMB2_OPLOCK_LEVEL_EXCLUSIVE;
 387        } else if (lease_state & SMB2_LEASE_READ_CACHING)
 388                return SMB2_OPLOCK_LEVEL_II;
 389        return 0;
 390}
 391
 392struct smb2_lease_break_work {
 393        struct work_struct lease_break;
 394        struct tcon_link *tlink;
 395        __u8 lease_key[16];
 396        __le32 lease_state;
 397};
 398
 399static void
 400cifs_ses_oplock_break(struct work_struct *work)
 401{
 402        struct smb2_lease_break_work *lw = container_of(work,
 403                                struct smb2_lease_break_work, lease_break);
 404        int rc;
 405
 406        rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
 407                              lw->lease_state);
 408        cFYI(1, "Lease release rc %d", rc);
 409        cifs_put_tlink(lw->tlink);
 410        kfree(lw);
 411}
 412
 413static bool
 414smb2_is_valid_lease_break(char *buffer, struct TCP_Server_Info *server)
 415{
 416        struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
 417        struct list_head *tmp, *tmp1, *tmp2;
 418        struct cifs_ses *ses;
 419        struct cifs_tcon *tcon;
 420        struct cifsInodeInfo *cinode;
 421        struct cifsFileInfo *cfile;
 422        struct cifs_pending_open *open;
 423        struct smb2_lease_break_work *lw;
 424        bool found;
 425        int ack_req = le32_to_cpu(rsp->Flags &
 426                                  SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
 427
 428        lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
 429        if (!lw) {
 430                cERROR(1, "Memory allocation failed during lease break check");
 431                return false;
 432        }
 433
 434        INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
 435        lw->lease_state = rsp->NewLeaseState;
 436
 437        cFYI(1, "Checking for lease break");
 438
 439        /* look up tcon based on tid & uid */
 440        spin_lock(&cifs_tcp_ses_lock);
 441        list_for_each(tmp, &server->smb_ses_list) {
 442                ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 443
 444                spin_lock(&cifs_file_list_lock);
 445                list_for_each(tmp1, &ses->tcon_list) {
 446                        tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
 447
 448                        cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
 449                        list_for_each(tmp2, &tcon->openFileList) {
 450                                cfile = list_entry(tmp2, struct cifsFileInfo,
 451                                                   tlist);
 452                                cinode = CIFS_I(cfile->dentry->d_inode);
 453
 454                                if (memcmp(cinode->lease_key, rsp->LeaseKey,
 455                                           SMB2_LEASE_KEY_SIZE))
 456                                        continue;
 457
 458                                cFYI(1, "found in the open list");
 459                                cFYI(1, "lease key match, lease break 0x%d",
 460                                     le32_to_cpu(rsp->NewLeaseState));
 461
 462                                smb2_set_oplock_level(cinode,
 463                                  smb2_map_lease_to_oplock(rsp->NewLeaseState));
 464
 465                                if (ack_req)
 466                                        cfile->oplock_break_cancelled = false;
 467                                else
 468                                        cfile->oplock_break_cancelled = true;
 469
 470                                queue_work(cifsiod_wq, &cfile->oplock_break);
 471
 472                                spin_unlock(&cifs_file_list_lock);
 473                                spin_unlock(&cifs_tcp_ses_lock);
 474                                return true;
 475                        }
 476
 477                        found = false;
 478                        list_for_each_entry(open, &tcon->pending_opens, olist) {
 479                                if (memcmp(open->lease_key, rsp->LeaseKey,
 480                                           SMB2_LEASE_KEY_SIZE))
 481                                        continue;
 482
 483                                if (!found && ack_req) {
 484                                        found = true;
 485                                        memcpy(lw->lease_key, open->lease_key,
 486                                               SMB2_LEASE_KEY_SIZE);
 487                                        lw->tlink = cifs_get_tlink(open->tlink);
 488                                        queue_work(cifsiod_wq,
 489                                                   &lw->lease_break);
 490                                }
 491
 492                                cFYI(1, "found in the pending open list");
 493                                cFYI(1, "lease key match, lease break 0x%d",
 494                                     le32_to_cpu(rsp->NewLeaseState));
 495
 496                                open->oplock =
 497                                  smb2_map_lease_to_oplock(rsp->NewLeaseState);
 498                        }
 499                        if (found) {
 500                                spin_unlock(&cifs_file_list_lock);
 501                                spin_unlock(&cifs_tcp_ses_lock);
 502                                return true;
 503                        }
 504                }
 505                spin_unlock(&cifs_file_list_lock);
 506        }
 507        spin_unlock(&cifs_tcp_ses_lock);
 508        kfree(lw);
 509        cFYI(1, "Can not process lease break - no lease matched");
 510        return false;
 511}
 512
 513bool
 514smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
 515{
 516        struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
 517        struct list_head *tmp, *tmp1, *tmp2;
 518        struct cifs_ses *ses;
 519        struct cifs_tcon *tcon;
 520        struct cifsInodeInfo *cinode;
 521        struct cifsFileInfo *cfile;
 522
 523        cFYI(1, "Checking for oplock break");
 524
 525        if (rsp->hdr.Command != SMB2_OPLOCK_BREAK)
 526                return false;
 527
 528        if (rsp->StructureSize !=
 529                                smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
 530                if (le16_to_cpu(rsp->StructureSize) == 44)
 531                        return smb2_is_valid_lease_break(buffer, server);
 532                else
 533                        return false;
 534        }
 535
 536        cFYI(1, "oplock level 0x%d", rsp->OplockLevel);
 537
 538        /* look up tcon based on tid & uid */
 539        spin_lock(&cifs_tcp_ses_lock);
 540        list_for_each(tmp, &server->smb_ses_list) {
 541                ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 542                list_for_each(tmp1, &ses->tcon_list) {
 543                        tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
 544
 545                        cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
 546                        spin_lock(&cifs_file_list_lock);
 547                        list_for_each(tmp2, &tcon->openFileList) {
 548                                cfile = list_entry(tmp2, struct cifsFileInfo,
 549                                                     tlist);
 550                                if (rsp->PersistentFid !=
 551                                    cfile->fid.persistent_fid ||
 552                                    rsp->VolatileFid !=
 553                                    cfile->fid.volatile_fid)
 554                                        continue;
 555
 556                                cFYI(1, "file id match, oplock break");
 557                                cinode = CIFS_I(cfile->dentry->d_inode);
 558
 559                                if (!cinode->clientCanCacheAll &&
 560                                    rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
 561                                        cfile->oplock_break_cancelled = true;
 562                                else
 563                                        cfile->oplock_break_cancelled = false;
 564
 565                                smb2_set_oplock_level(cinode,
 566                                  rsp->OplockLevel ? SMB2_OPLOCK_LEVEL_II : 0);
 567
 568                                queue_work(cifsiod_wq, &cfile->oplock_break);
 569
 570                                spin_unlock(&cifs_file_list_lock);
 571                                spin_unlock(&cifs_tcp_ses_lock);
 572                                return true;
 573                        }
 574                        spin_unlock(&cifs_file_list_lock);
 575                        spin_unlock(&cifs_tcp_ses_lock);
 576                        cFYI(1, "No matching file for oplock break");
 577                        return true;
 578                }
 579        }
 580        spin_unlock(&cifs_tcp_ses_lock);
 581        cFYI(1, "Can not process oplock break for non-existent connection");
 582        return false;
 583}
 584