linux/fs/cifs/misc.c
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   1/*
   2 *   fs/cifs/misc.c
   3 *
   4 *   Copyright (C) International Business Machines  Corp., 2002,2008
   5 *   Author(s): Steve French (sfrench@us.ibm.com)
   6 *
   7 *   This library is free software; you can redistribute it and/or modify
   8 *   it under the terms of the GNU Lesser General Public License as published
   9 *   by the Free Software Foundation; either version 2.1 of the License, or
  10 *   (at your option) any later version.
  11 *
  12 *   This library is distributed in the hope that it will be useful,
  13 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15 *   the GNU Lesser General Public License for more details.
  16 *
  17 *   You should have received a copy of the GNU Lesser General Public License
  18 *   along with this library; if not, write to the Free Software
  19 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20 */
  21
  22#include <linux/slab.h>
  23#include <linux/ctype.h>
  24#include <linux/mempool.h>
  25#include "cifspdu.h"
  26#include "cifsglob.h"
  27#include "cifsproto.h"
  28#include "cifs_debug.h"
  29#include "smberr.h"
  30#include "nterr.h"
  31#include "cifs_unicode.h"
  32#ifdef CONFIG_CIFS_SMB2
  33#include "smb2pdu.h"
  34#endif
  35
  36extern mempool_t *cifs_sm_req_poolp;
  37extern mempool_t *cifs_req_poolp;
  38
  39/* The xid serves as a useful identifier for each incoming vfs request,
  40   in a similar way to the mid which is useful to track each sent smb,
  41   and CurrentXid can also provide a running counter (although it
  42   will eventually wrap past zero) of the total vfs operations handled
  43   since the cifs fs was mounted */
  44
  45unsigned int
  46_get_xid(void)
  47{
  48        unsigned int xid;
  49
  50        spin_lock(&GlobalMid_Lock);
  51        GlobalTotalActiveXid++;
  52
  53        /* keep high water mark for number of simultaneous ops in filesystem */
  54        if (GlobalTotalActiveXid > GlobalMaxActiveXid)
  55                GlobalMaxActiveXid = GlobalTotalActiveXid;
  56        if (GlobalTotalActiveXid > 65000)
  57                cFYI(1, "warning: more than 65000 requests active");
  58        xid = GlobalCurrentXid++;
  59        spin_unlock(&GlobalMid_Lock);
  60        return xid;
  61}
  62
  63void
  64_free_xid(unsigned int xid)
  65{
  66        spin_lock(&GlobalMid_Lock);
  67        /* if (GlobalTotalActiveXid == 0)
  68                BUG(); */
  69        GlobalTotalActiveXid--;
  70        spin_unlock(&GlobalMid_Lock);
  71}
  72
  73struct cifs_ses *
  74sesInfoAlloc(void)
  75{
  76        struct cifs_ses *ret_buf;
  77
  78        ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL);
  79        if (ret_buf) {
  80                atomic_inc(&sesInfoAllocCount);
  81                ret_buf->status = CifsNew;
  82                ++ret_buf->ses_count;
  83                INIT_LIST_HEAD(&ret_buf->smb_ses_list);
  84                INIT_LIST_HEAD(&ret_buf->tcon_list);
  85                mutex_init(&ret_buf->session_mutex);
  86        }
  87        return ret_buf;
  88}
  89
  90void
  91sesInfoFree(struct cifs_ses *buf_to_free)
  92{
  93        if (buf_to_free == NULL) {
  94                cFYI(1, "Null buffer passed to sesInfoFree");
  95                return;
  96        }
  97
  98        atomic_dec(&sesInfoAllocCount);
  99        kfree(buf_to_free->serverOS);
 100        kfree(buf_to_free->serverDomain);
 101        kfree(buf_to_free->serverNOS);
 102        if (buf_to_free->password) {
 103                memset(buf_to_free->password, 0, strlen(buf_to_free->password));
 104                kfree(buf_to_free->password);
 105        }
 106        kfree(buf_to_free->user_name);
 107        kfree(buf_to_free->domainName);
 108        kfree(buf_to_free);
 109}
 110
 111struct cifs_tcon *
 112tconInfoAlloc(void)
 113{
 114        struct cifs_tcon *ret_buf;
 115        ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
 116        if (ret_buf) {
 117                atomic_inc(&tconInfoAllocCount);
 118                ret_buf->tidStatus = CifsNew;
 119                ++ret_buf->tc_count;
 120                INIT_LIST_HEAD(&ret_buf->openFileList);
 121                INIT_LIST_HEAD(&ret_buf->tcon_list);
 122#ifdef CONFIG_CIFS_STATS
 123                spin_lock_init(&ret_buf->stat_lock);
 124#endif
 125        }
 126        return ret_buf;
 127}
 128
 129void
 130tconInfoFree(struct cifs_tcon *buf_to_free)
 131{
 132        if (buf_to_free == NULL) {
 133                cFYI(1, "Null buffer passed to tconInfoFree");
 134                return;
 135        }
 136        atomic_dec(&tconInfoAllocCount);
 137        kfree(buf_to_free->nativeFileSystem);
 138        if (buf_to_free->password) {
 139                memset(buf_to_free->password, 0, strlen(buf_to_free->password));
 140                kfree(buf_to_free->password);
 141        }
 142        kfree(buf_to_free);
 143}
 144
 145struct smb_hdr *
 146cifs_buf_get(void)
 147{
 148        struct smb_hdr *ret_buf = NULL;
 149        size_t buf_size = sizeof(struct smb_hdr);
 150
 151#ifdef CONFIG_CIFS_SMB2
 152        /*
 153         * SMB2 header is bigger than CIFS one - no problems to clean some
 154         * more bytes for CIFS.
 155         */
 156        buf_size = sizeof(struct smb2_hdr);
 157#endif
 158        /*
 159         * We could use negotiated size instead of max_msgsize -
 160         * but it may be more efficient to always alloc same size
 161         * albeit slightly larger than necessary and maxbuffersize
 162         * defaults to this and can not be bigger.
 163         */
 164        ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
 165
 166        /* clear the first few header bytes */
 167        /* for most paths, more is cleared in header_assemble */
 168        if (ret_buf) {
 169                memset(ret_buf, 0, buf_size + 3);
 170                atomic_inc(&bufAllocCount);
 171#ifdef CONFIG_CIFS_STATS2
 172                atomic_inc(&totBufAllocCount);
 173#endif /* CONFIG_CIFS_STATS2 */
 174        }
 175
 176        return ret_buf;
 177}
 178
 179void
 180cifs_buf_release(void *buf_to_free)
 181{
 182        if (buf_to_free == NULL) {
 183                /* cFYI(1, "Null buffer passed to cifs_buf_release");*/
 184                return;
 185        }
 186        mempool_free(buf_to_free, cifs_req_poolp);
 187
 188        atomic_dec(&bufAllocCount);
 189        return;
 190}
 191
 192struct smb_hdr *
 193cifs_small_buf_get(void)
 194{
 195        struct smb_hdr *ret_buf = NULL;
 196
 197/* We could use negotiated size instead of max_msgsize -
 198   but it may be more efficient to always alloc same size
 199   albeit slightly larger than necessary and maxbuffersize
 200   defaults to this and can not be bigger */
 201        ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
 202        if (ret_buf) {
 203        /* No need to clear memory here, cleared in header assemble */
 204        /*      memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
 205                atomic_inc(&smBufAllocCount);
 206#ifdef CONFIG_CIFS_STATS2
 207                atomic_inc(&totSmBufAllocCount);
 208#endif /* CONFIG_CIFS_STATS2 */
 209
 210        }
 211        return ret_buf;
 212}
 213
 214void
 215cifs_small_buf_release(void *buf_to_free)
 216{
 217
 218        if (buf_to_free == NULL) {
 219                cFYI(1, "Null buffer passed to cifs_small_buf_release");
 220                return;
 221        }
 222        mempool_free(buf_to_free, cifs_sm_req_poolp);
 223
 224        atomic_dec(&smBufAllocCount);
 225        return;
 226}
 227
 228/* NB: MID can not be set if treeCon not passed in, in that
 229   case it is responsbility of caller to set the mid */
 230void
 231header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
 232                const struct cifs_tcon *treeCon, int word_count
 233                /* length of fixed section (word count) in two byte units  */)
 234{
 235        char *temp = (char *) buffer;
 236
 237        memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
 238
 239        buffer->smb_buf_length = cpu_to_be32(
 240            (2 * word_count) + sizeof(struct smb_hdr) -
 241            4 /*  RFC 1001 length field does not count */  +
 242            2 /* for bcc field itself */) ;
 243
 244        buffer->Protocol[0] = 0xFF;
 245        buffer->Protocol[1] = 'S';
 246        buffer->Protocol[2] = 'M';
 247        buffer->Protocol[3] = 'B';
 248        buffer->Command = smb_command;
 249        buffer->Flags = 0x00;   /* case sensitive */
 250        buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
 251        buffer->Pid = cpu_to_le16((__u16)current->tgid);
 252        buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
 253        if (treeCon) {
 254                buffer->Tid = treeCon->tid;
 255                if (treeCon->ses) {
 256                        if (treeCon->ses->capabilities & CAP_UNICODE)
 257                                buffer->Flags2 |= SMBFLG2_UNICODE;
 258                        if (treeCon->ses->capabilities & CAP_STATUS32)
 259                                buffer->Flags2 |= SMBFLG2_ERR_STATUS;
 260
 261                        /* Uid is not converted */
 262                        buffer->Uid = treeCon->ses->Suid;
 263                        buffer->Mid = get_next_mid(treeCon->ses->server);
 264                }
 265                if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
 266                        buffer->Flags2 |= SMBFLG2_DFS;
 267                if (treeCon->nocase)
 268                        buffer->Flags  |= SMBFLG_CASELESS;
 269                if ((treeCon->ses) && (treeCon->ses->server))
 270                        if (treeCon->ses->server->sec_mode &
 271                          (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 272                                buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
 273        }
 274
 275/*  endian conversion of flags is now done just before sending */
 276        buffer->WordCount = (char) word_count;
 277        return;
 278}
 279
 280static int
 281check_smb_hdr(struct smb_hdr *smb, __u16 mid)
 282{
 283        /* does it have the right SMB "signature" ? */
 284        if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
 285                cERROR(1, "Bad protocol string signature header 0x%x",
 286                        *(unsigned int *)smb->Protocol);
 287                return 1;
 288        }
 289
 290        /* Make sure that message ids match */
 291        if (mid != smb->Mid) {
 292                cERROR(1, "Mids do not match. received=%u expected=%u",
 293                        smb->Mid, mid);
 294                return 1;
 295        }
 296
 297        /* if it's a response then accept */
 298        if (smb->Flags & SMBFLG_RESPONSE)
 299                return 0;
 300
 301        /* only one valid case where server sends us request */
 302        if (smb->Command == SMB_COM_LOCKING_ANDX)
 303                return 0;
 304
 305        cERROR(1, "Server sent request, not response. mid=%u", smb->Mid);
 306        return 1;
 307}
 308
 309int
 310checkSMB(char *buf, unsigned int total_read)
 311{
 312        struct smb_hdr *smb = (struct smb_hdr *)buf;
 313        __u16 mid = smb->Mid;
 314        __u32 rfclen = be32_to_cpu(smb->smb_buf_length);
 315        __u32 clc_len;  /* calculated length */
 316        cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x",
 317                total_read, rfclen);
 318
 319        /* is this frame too small to even get to a BCC? */
 320        if (total_read < 2 + sizeof(struct smb_hdr)) {
 321                if ((total_read >= sizeof(struct smb_hdr) - 1)
 322                            && (smb->Status.CifsError != 0)) {
 323                        /* it's an error return */
 324                        smb->WordCount = 0;
 325                        /* some error cases do not return wct and bcc */
 326                        return 0;
 327                } else if ((total_read == sizeof(struct smb_hdr) + 1) &&
 328                                (smb->WordCount == 0)) {
 329                        char *tmp = (char *)smb;
 330                        /* Need to work around a bug in two servers here */
 331                        /* First, check if the part of bcc they sent was zero */
 332                        if (tmp[sizeof(struct smb_hdr)] == 0) {
 333                                /* some servers return only half of bcc
 334                                 * on simple responses (wct, bcc both zero)
 335                                 * in particular have seen this on
 336                                 * ulogoffX and FindClose. This leaves
 337                                 * one byte of bcc potentially unitialized
 338                                 */
 339                                /* zero rest of bcc */
 340                                tmp[sizeof(struct smb_hdr)+1] = 0;
 341                                return 0;
 342                        }
 343                        cERROR(1, "rcvd invalid byte count (bcc)");
 344                } else {
 345                        cERROR(1, "Length less than smb header size");
 346                }
 347                return -EIO;
 348        }
 349
 350        /* otherwise, there is enough to get to the BCC */
 351        if (check_smb_hdr(smb, mid))
 352                return -EIO;
 353        clc_len = smbCalcSize(smb);
 354
 355        if (4 + rfclen != total_read) {
 356                cERROR(1, "Length read does not match RFC1001 length %d",
 357                                rfclen);
 358                return -EIO;
 359        }
 360
 361        if (4 + rfclen != clc_len) {
 362                /* check if bcc wrapped around for large read responses */
 363                if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
 364                        /* check if lengths match mod 64K */
 365                        if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
 366                                return 0; /* bcc wrapped */
 367                }
 368                cFYI(1, "Calculated size %u vs length %u mismatch for mid=%u",
 369                                clc_len, 4 + rfclen, smb->Mid);
 370
 371                if (4 + rfclen < clc_len) {
 372                        cERROR(1, "RFC1001 size %u smaller than SMB for mid=%u",
 373                                        rfclen, smb->Mid);
 374                        return -EIO;
 375                } else if (rfclen > clc_len + 512) {
 376                        /*
 377                         * Some servers (Windows XP in particular) send more
 378                         * data than the lengths in the SMB packet would
 379                         * indicate on certain calls (byte range locks and
 380                         * trans2 find first calls in particular). While the
 381                         * client can handle such a frame by ignoring the
 382                         * trailing data, we choose limit the amount of extra
 383                         * data to 512 bytes.
 384                         */
 385                        cERROR(1, "RFC1001 size %u more than 512 bytes larger "
 386                                  "than SMB for mid=%u", rfclen, smb->Mid);
 387                        return -EIO;
 388                }
 389        }
 390        return 0;
 391}
 392
 393bool
 394is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
 395{
 396        struct smb_hdr *buf = (struct smb_hdr *)buffer;
 397        struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
 398        struct list_head *tmp, *tmp1, *tmp2;
 399        struct cifs_ses *ses;
 400        struct cifs_tcon *tcon;
 401        struct cifsInodeInfo *pCifsInode;
 402        struct cifsFileInfo *netfile;
 403
 404        cFYI(1, "Checking for oplock break or dnotify response");
 405        if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
 406           (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
 407                struct smb_com_transaction_change_notify_rsp *pSMBr =
 408                        (struct smb_com_transaction_change_notify_rsp *)buf;
 409                struct file_notify_information *pnotify;
 410                __u32 data_offset = 0;
 411                if (get_bcc(buf) > sizeof(struct file_notify_information)) {
 412                        data_offset = le32_to_cpu(pSMBr->DataOffset);
 413
 414                        pnotify = (struct file_notify_information *)
 415                                ((char *)&pSMBr->hdr.Protocol + data_offset);
 416                        cFYI(1, "dnotify on %s Action: 0x%x",
 417                                 pnotify->FileName, pnotify->Action);
 418                        /*   cifs_dump_mem("Rcvd notify Data: ",buf,
 419                                sizeof(struct smb_hdr)+60); */
 420                        return true;
 421                }
 422                if (pSMBr->hdr.Status.CifsError) {
 423                        cFYI(1, "notify err 0x%d",
 424                                pSMBr->hdr.Status.CifsError);
 425                        return true;
 426                }
 427                return false;
 428        }
 429        if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
 430                return false;
 431        if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
 432                /* no sense logging error on invalid handle on oplock
 433                   break - harmless race between close request and oplock
 434                   break response is expected from time to time writing out
 435                   large dirty files cached on the client */
 436                if ((NT_STATUS_INVALID_HANDLE) ==
 437                   le32_to_cpu(pSMB->hdr.Status.CifsError)) {
 438                        cFYI(1, "invalid handle on oplock break");
 439                        return true;
 440                } else if (ERRbadfid ==
 441                   le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
 442                        return true;
 443                } else {
 444                        return false; /* on valid oplock brk we get "request" */
 445                }
 446        }
 447        if (pSMB->hdr.WordCount != 8)
 448                return false;
 449
 450        cFYI(1, "oplock type 0x%d level 0x%d",
 451                 pSMB->LockType, pSMB->OplockLevel);
 452        if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
 453                return false;
 454
 455        /* look up tcon based on tid & uid */
 456        spin_lock(&cifs_tcp_ses_lock);
 457        list_for_each(tmp, &srv->smb_ses_list) {
 458                ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 459                list_for_each(tmp1, &ses->tcon_list) {
 460                        tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
 461                        if (tcon->tid != buf->Tid)
 462                                continue;
 463
 464                        cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
 465                        spin_lock(&cifs_file_list_lock);
 466                        list_for_each(tmp2, &tcon->openFileList) {
 467                                netfile = list_entry(tmp2, struct cifsFileInfo,
 468                                                     tlist);
 469                                if (pSMB->Fid != netfile->fid.netfid)
 470                                        continue;
 471
 472                                cFYI(1, "file id match, oplock break");
 473                                pCifsInode = CIFS_I(netfile->dentry->d_inode);
 474
 475                                cifs_set_oplock_level(pCifsInode,
 476                                        pSMB->OplockLevel ? OPLOCK_READ : 0);
 477                                queue_work(cifsiod_wq,
 478                                           &netfile->oplock_break);
 479                                netfile->oplock_break_cancelled = false;
 480
 481                                spin_unlock(&cifs_file_list_lock);
 482                                spin_unlock(&cifs_tcp_ses_lock);
 483                                return true;
 484                        }
 485                        spin_unlock(&cifs_file_list_lock);
 486                        spin_unlock(&cifs_tcp_ses_lock);
 487                        cFYI(1, "No matching file for oplock break");
 488                        return true;
 489                }
 490        }
 491        spin_unlock(&cifs_tcp_ses_lock);
 492        cFYI(1, "Can not process oplock break for non-existent connection");
 493        return true;
 494}
 495
 496void
 497dump_smb(void *buf, int smb_buf_length)
 498{
 499        int i, j;
 500        char debug_line[17];
 501        unsigned char *buffer = buf;
 502
 503        if (traceSMB == 0)
 504                return;
 505
 506        for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
 507                if (i % 8 == 0) {
 508                        /* have reached the beginning of line */
 509                        printk(KERN_DEBUG "| ");
 510                        j = 0;
 511                }
 512                printk("%0#4x ", buffer[i]);
 513                debug_line[2 * j] = ' ';
 514                if (isprint(buffer[i]))
 515                        debug_line[1 + (2 * j)] = buffer[i];
 516                else
 517                        debug_line[1 + (2 * j)] = '_';
 518
 519                if (i % 8 == 7) {
 520                        /* reached end of line, time to print ascii */
 521                        debug_line[16] = 0;
 522                        printk(" | %s\n", debug_line);
 523                }
 524        }
 525        for (; j < 8; j++) {
 526                printk("     ");
 527                debug_line[2 * j] = ' ';
 528                debug_line[1 + (2 * j)] = ' ';
 529        }
 530        printk(" | %s\n", debug_line);
 531        return;
 532}
 533
 534void
 535cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
 536{
 537        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 538                cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 539                cERROR(1, "Autodisabling the use of server inode numbers on "
 540                           "%s. This server doesn't seem to support them "
 541                           "properly. Hardlinks will not be recognized on this "
 542                           "mount. Consider mounting with the \"noserverino\" "
 543                           "option to silence this message.",
 544                           cifs_sb_master_tcon(cifs_sb)->treeName);
 545        }
 546}
 547
 548void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
 549{
 550        oplock &= 0xF;
 551
 552        if (oplock == OPLOCK_EXCLUSIVE) {
 553                cinode->clientCanCacheAll = true;
 554                cinode->clientCanCacheRead = true;
 555                cFYI(1, "Exclusive Oplock granted on inode %p",
 556                     &cinode->vfs_inode);
 557        } else if (oplock == OPLOCK_READ) {
 558                cinode->clientCanCacheAll = false;
 559                cinode->clientCanCacheRead = true;
 560                cFYI(1, "Level II Oplock granted on inode %p",
 561                    &cinode->vfs_inode);
 562        } else {
 563                cinode->clientCanCacheAll = false;
 564                cinode->clientCanCacheRead = false;
 565        }
 566}
 567
 568bool
 569backup_cred(struct cifs_sb_info *cifs_sb)
 570{
 571        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
 572                if (cifs_sb->mnt_backupuid == current_fsuid())
 573                        return true;
 574        }
 575        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
 576                if (in_group_p(cifs_sb->mnt_backupgid))
 577                        return true;
 578        }
 579
 580        return false;
 581}
 582
 583void
 584cifs_del_pending_open(struct cifs_pending_open *open)
 585{
 586        spin_lock(&cifs_file_list_lock);
 587        list_del(&open->olist);
 588        spin_unlock(&cifs_file_list_lock);
 589}
 590
 591void
 592cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink,
 593                             struct cifs_pending_open *open)
 594{
 595#ifdef CONFIG_CIFS_SMB2
 596        memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
 597#endif
 598        open->oplock = CIFS_OPLOCK_NO_CHANGE;
 599        open->tlink = tlink;
 600        fid->pending_open = open;
 601        list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens);
 602}
 603
 604void
 605cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
 606                      struct cifs_pending_open *open)
 607{
 608        spin_lock(&cifs_file_list_lock);
 609        cifs_add_pending_open_locked(fid, tlink, open);
 610        spin_unlock(&cifs_file_list_lock);
 611}
 612
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