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
  33extern mempool_t *cifs_sm_req_poolp;
  34extern mempool_t *cifs_req_poolp;
  35
  36/* The xid serves as a useful identifier for each incoming vfs request,
  37   in a similar way to the mid which is useful to track each sent smb,
  38   and CurrentXid can also provide a running counter (although it
  39   will eventually wrap past zero) of the total vfs operations handled
  40   since the cifs fs was mounted */
  41
  42unsigned int
  43_GetXid(void)
  44{
  45        unsigned int xid;
  46
  47        spin_lock(&GlobalMid_Lock);
  48        GlobalTotalActiveXid++;
  49
  50        /* keep high water mark for number of simultaneous ops in filesystem */
  51        if (GlobalTotalActiveXid > GlobalMaxActiveXid)
  52                GlobalMaxActiveXid = GlobalTotalActiveXid;
  53        if (GlobalTotalActiveXid > 65000)
  54                cFYI(1, "warning: more than 65000 requests active");
  55        xid = GlobalCurrentXid++;
  56        spin_unlock(&GlobalMid_Lock);
  57        return xid;
  58}
  59
  60void
  61_FreeXid(unsigned int xid)
  62{
  63        spin_lock(&GlobalMid_Lock);
  64        /* if (GlobalTotalActiveXid == 0)
  65                BUG(); */
  66        GlobalTotalActiveXid--;
  67        spin_unlock(&GlobalMid_Lock);
  68}
  69
  70struct cifsSesInfo *
  71sesInfoAlloc(void)
  72{
  73        struct cifsSesInfo *ret_buf;
  74
  75        ret_buf = kzalloc(sizeof(struct cifsSesInfo), GFP_KERNEL);
  76        if (ret_buf) {
  77                atomic_inc(&sesInfoAllocCount);
  78                ret_buf->status = CifsNew;
  79                ++ret_buf->ses_count;
  80                INIT_LIST_HEAD(&ret_buf->smb_ses_list);
  81                INIT_LIST_HEAD(&ret_buf->tcon_list);
  82                mutex_init(&ret_buf->session_mutex);
  83        }
  84        return ret_buf;
  85}
  86
  87void
  88sesInfoFree(struct cifsSesInfo *buf_to_free)
  89{
  90        if (buf_to_free == NULL) {
  91                cFYI(1, "Null buffer passed to sesInfoFree");
  92                return;
  93        }
  94
  95        atomic_dec(&sesInfoAllocCount);
  96        kfree(buf_to_free->serverOS);
  97        kfree(buf_to_free->serverDomain);
  98        kfree(buf_to_free->serverNOS);
  99        if (buf_to_free->password) {
 100                memset(buf_to_free->password, 0, strlen(buf_to_free->password));
 101                kfree(buf_to_free->password);
 102        }
 103        kfree(buf_to_free->user_name);
 104        kfree(buf_to_free->domainName);
 105        kfree(buf_to_free);
 106}
 107
 108struct cifsTconInfo *
 109tconInfoAlloc(void)
 110{
 111        struct cifsTconInfo *ret_buf;
 112        ret_buf = kzalloc(sizeof(struct cifsTconInfo), GFP_KERNEL);
 113        if (ret_buf) {
 114                atomic_inc(&tconInfoAllocCount);
 115                ret_buf->tidStatus = CifsNew;
 116                ++ret_buf->tc_count;
 117                INIT_LIST_HEAD(&ret_buf->openFileList);
 118                INIT_LIST_HEAD(&ret_buf->tcon_list);
 119#ifdef CONFIG_CIFS_STATS
 120                spin_lock_init(&ret_buf->stat_lock);
 121#endif
 122        }
 123        return ret_buf;
 124}
 125
 126void
 127tconInfoFree(struct cifsTconInfo *buf_to_free)
 128{
 129        if (buf_to_free == NULL) {
 130                cFYI(1, "Null buffer passed to tconInfoFree");
 131                return;
 132        }
 133        atomic_dec(&tconInfoAllocCount);
 134        kfree(buf_to_free->nativeFileSystem);
 135        if (buf_to_free->password) {
 136                memset(buf_to_free->password, 0, strlen(buf_to_free->password));
 137                kfree(buf_to_free->password);
 138        }
 139        kfree(buf_to_free);
 140}
 141
 142struct smb_hdr *
 143cifs_buf_get(void)
 144{
 145        struct smb_hdr *ret_buf = NULL;
 146
 147/* We could use negotiated size instead of max_msgsize -
 148   but it may be more efficient to always alloc same size
 149   albeit slightly larger than necessary and maxbuffersize
 150   defaults to this and can not be bigger */
 151        ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
 152
 153        /* clear the first few header bytes */
 154        /* for most paths, more is cleared in header_assemble */
 155        if (ret_buf) {
 156                memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
 157                atomic_inc(&bufAllocCount);
 158#ifdef CONFIG_CIFS_STATS2
 159                atomic_inc(&totBufAllocCount);
 160#endif /* CONFIG_CIFS_STATS2 */
 161        }
 162
 163        return ret_buf;
 164}
 165
 166void
 167cifs_buf_release(void *buf_to_free)
 168{
 169        if (buf_to_free == NULL) {
 170                /* cFYI(1, "Null buffer passed to cifs_buf_release");*/
 171                return;
 172        }
 173        mempool_free(buf_to_free, cifs_req_poolp);
 174
 175        atomic_dec(&bufAllocCount);
 176        return;
 177}
 178
 179struct smb_hdr *
 180cifs_small_buf_get(void)
 181{
 182        struct smb_hdr *ret_buf = NULL;
 183
 184/* We could use negotiated size instead of max_msgsize -
 185   but it may be more efficient to always alloc same size
 186   albeit slightly larger than necessary and maxbuffersize
 187   defaults to this and can not be bigger */
 188        ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
 189        if (ret_buf) {
 190        /* No need to clear memory here, cleared in header assemble */
 191        /*      memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
 192                atomic_inc(&smBufAllocCount);
 193#ifdef CONFIG_CIFS_STATS2
 194                atomic_inc(&totSmBufAllocCount);
 195#endif /* CONFIG_CIFS_STATS2 */
 196
 197        }
 198        return ret_buf;
 199}
 200
 201void
 202cifs_small_buf_release(void *buf_to_free)
 203{
 204
 205        if (buf_to_free == NULL) {
 206                cFYI(1, "Null buffer passed to cifs_small_buf_release");
 207                return;
 208        }
 209        mempool_free(buf_to_free, cifs_sm_req_poolp);
 210
 211        atomic_dec(&smBufAllocCount);
 212        return;
 213}
 214
 215/*
 216        Find a free multiplex id (SMB mid). Otherwise there could be
 217        mid collisions which might cause problems, demultiplexing the
 218        wrong response to this request. Multiplex ids could collide if
 219        one of a series requests takes much longer than the others, or
 220        if a very large number of long lived requests (byte range
 221        locks or FindNotify requests) are pending.  No more than
 222        64K-1 requests can be outstanding at one time.  If no
 223        mids are available, return zero.  A future optimization
 224        could make the combination of mids and uid the key we use
 225        to demultiplex on (rather than mid alone).
 226        In addition to the above check, the cifs demultiplex
 227        code already used the command code as a secondary
 228        check of the frame and if signing is negotiated the
 229        response would be discarded if the mid were the same
 230        but the signature was wrong.  Since the mid is not put in the
 231        pending queue until later (when it is about to be dispatched)
 232        we do have to limit the number of outstanding requests
 233        to somewhat less than 64K-1 although it is hard to imagine
 234        so many threads being in the vfs at one time.
 235*/
 236__u16 GetNextMid(struct TCP_Server_Info *server)
 237{
 238        __u16 mid = 0;
 239        __u16 last_mid;
 240        bool collision;
 241
 242        spin_lock(&GlobalMid_Lock);
 243        last_mid = server->CurrentMid; /* we do not want to loop forever */
 244        server->CurrentMid++;
 245        /* This nested loop looks more expensive than it is.
 246        In practice the list of pending requests is short,
 247        fewer than 50, and the mids are likely to be unique
 248        on the first pass through the loop unless some request
 249        takes longer than the 64 thousand requests before it
 250        (and it would also have to have been a request that
 251         did not time out) */
 252        while (server->CurrentMid != last_mid) {
 253                struct mid_q_entry *mid_entry;
 254                unsigned int num_mids;
 255
 256                collision = false;
 257                if (server->CurrentMid == 0)
 258                        server->CurrentMid++;
 259
 260                num_mids = 0;
 261                list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
 262                        ++num_mids;
 263                        if (mid_entry->mid == server->CurrentMid &&
 264                            mid_entry->midState == MID_REQUEST_SUBMITTED) {
 265                                /* This mid is in use, try a different one */
 266                                collision = true;
 267                                break;
 268                        }
 269                }
 270
 271                /*
 272                 * if we have more than 32k mids in the list, then something
 273                 * is very wrong. Possibly a local user is trying to DoS the
 274                 * box by issuing long-running calls and SIGKILL'ing them. If
 275                 * we get to 2^16 mids then we're in big trouble as this
 276                 * function could loop forever.
 277                 *
 278                 * Go ahead and assign out the mid in this situation, but force
 279                 * an eventual reconnect to clean out the pending_mid_q.
 280                 */
 281                if (num_mids > 32768)
 282                        server->tcpStatus = CifsNeedReconnect;
 283
 284                if (!collision) {
 285                        mid = server->CurrentMid;
 286                        break;
 287                }
 288                server->CurrentMid++;
 289        }
 290        spin_unlock(&GlobalMid_Lock);
 291        return mid;
 292}
 293
 294/* NB: MID can not be set if treeCon not passed in, in that
 295   case it is responsbility of caller to set the mid */
 296void
 297header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
 298                const struct cifsTconInfo *treeCon, int word_count
 299                /* length of fixed section (word count) in two byte units  */)
 300{
 301        struct list_head *temp_item;
 302        struct cifsSesInfo *ses;
 303        char *temp = (char *) buffer;
 304
 305        memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
 306
 307        buffer->smb_buf_length =
 308            (2 * word_count) + sizeof(struct smb_hdr) -
 309            4 /*  RFC 1001 length field does not count */  +
 310            2 /* for bcc field itself */ ;
 311        /* Note that this is the only network field that has to be converted
 312           to big endian and it is done just before we send it */
 313
 314        buffer->Protocol[0] = 0xFF;
 315        buffer->Protocol[1] = 'S';
 316        buffer->Protocol[2] = 'M';
 317        buffer->Protocol[3] = 'B';
 318        buffer->Command = smb_command;
 319        buffer->Flags = 0x00;   /* case sensitive */
 320        buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
 321        buffer->Pid = cpu_to_le16((__u16)current->tgid);
 322        buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
 323        if (treeCon) {
 324                buffer->Tid = treeCon->tid;
 325                if (treeCon->ses) {
 326                        if (treeCon->ses->capabilities & CAP_UNICODE)
 327                                buffer->Flags2 |= SMBFLG2_UNICODE;
 328                        if (treeCon->ses->capabilities & CAP_STATUS32)
 329                                buffer->Flags2 |= SMBFLG2_ERR_STATUS;
 330
 331                        /* Uid is not converted */
 332                        buffer->Uid = treeCon->ses->Suid;
 333                        buffer->Mid = GetNextMid(treeCon->ses->server);
 334                        if (multiuser_mount != 0) {
 335                /* For the multiuser case, there are few obvious technically  */
 336                /* possible mechanisms to match the local linux user (uid)    */
 337                /* to a valid remote smb user (smb_uid):                      */
 338                /*      1) Query Winbind (or other local pam/nss daemon       */
 339                /*        for userid/password/logon_domain or credential      */
 340                /*      2) Query Winbind for uid to sid to username mapping   */
 341                /*         and see if we have a matching password for existing*/
 342                /*         session for that user perhas getting password by   */
 343                /*         adding a new pam_cifs module that stores passwords */
 344                /*         so that the cifs vfs can get at that for all logged*/
 345                /*         on users                                           */
 346                /*      3) (Which is the mechanism we have chosen)            */
 347                /*         Search through sessions to the same server for a   */
 348                /*         a match on the uid that was passed in on mount     */
 349                /*         with the current processes uid (or euid?) and use  */
 350                /*         that smb uid.   If no existing smb session for     */
 351                /*         that uid found, use the default smb session ie     */
 352                /*         the smb session for the volume mounted which is    */
 353                /*         the same as would be used if the multiuser mount   */
 354                /*         flag were disabled.  */
 355
 356                /*  BB Add support for establishing new tCon and SMB Session  */
 357                /*      with userid/password pairs found on the smb session   */
 358                /*      for other target tcp/ip addresses               BB    */
 359                                if (current_fsuid() != treeCon->ses->linux_uid) {
 360                                        cFYI(1, "Multiuser mode and UID "
 361                                                 "did not match tcon uid");
 362                                        spin_lock(&cifs_tcp_ses_lock);
 363                                        list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) {
 364                                                ses = list_entry(temp_item, struct cifsSesInfo, smb_ses_list);
 365                                                if (ses->linux_uid == current_fsuid()) {
 366                                                        if (ses->server == treeCon->ses->server) {
 367                                                                cFYI(1, "found matching uid substitute right smb_uid");
 368                                                                buffer->Uid = ses->Suid;
 369                                                                break;
 370                                                        } else {
 371                                /* BB eventually call cifs_setup_session here */
 372                                                                cFYI(1, "local UID found but no smb sess with this server exists");
 373                                                        }
 374                                                }
 375                                        }
 376                                        spin_unlock(&cifs_tcp_ses_lock);
 377                                }
 378                        }
 379                }
 380                if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
 381                        buffer->Flags2 |= SMBFLG2_DFS;
 382                if (treeCon->nocase)
 383                        buffer->Flags  |= SMBFLG_CASELESS;
 384                if ((treeCon->ses) && (treeCon->ses->server))
 385                        if (treeCon->ses->server->secMode &
 386                          (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 387                                buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
 388        }
 389
 390/*  endian conversion of flags is now done just before sending */
 391        buffer->WordCount = (char) word_count;
 392        return;
 393}
 394
 395static int
 396check_smb_hdr(struct smb_hdr *smb, __u16 mid)
 397{
 398        /* does it have the right SMB "signature" ? */
 399        if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
 400                cERROR(1, "Bad protocol string signature header 0x%x",
 401                        *(unsigned int *)smb->Protocol);
 402                return 1;
 403        }
 404
 405        /* Make sure that message ids match */
 406        if (mid != smb->Mid) {
 407                cERROR(1, "Mids do not match. received=%u expected=%u",
 408                        smb->Mid, mid);
 409                return 1;
 410        }
 411
 412        /* if it's a response then accept */
 413        if (smb->Flags & SMBFLG_RESPONSE)
 414                return 0;
 415
 416        /* only one valid case where server sends us request */
 417        if (smb->Command == SMB_COM_LOCKING_ANDX)
 418                return 0;
 419
 420        cERROR(1, "Server sent request, not response. mid=%u", smb->Mid);
 421        return 1;
 422}
 423
 424int
 425checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length)
 426{
 427        __u32 len = smb->smb_buf_length;
 428        __u32 clc_len;  /* calculated length */
 429        cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len);
 430
 431        if (length < 2 + sizeof(struct smb_hdr)) {
 432                if ((length >= sizeof(struct smb_hdr) - 1)
 433                            && (smb->Status.CifsError != 0)) {
 434                        smb->WordCount = 0;
 435                        /* some error cases do not return wct and bcc */
 436                        return 0;
 437                } else if ((length == sizeof(struct smb_hdr) + 1) &&
 438                                (smb->WordCount == 0)) {
 439                        char *tmp = (char *)smb;
 440                        /* Need to work around a bug in two servers here */
 441                        /* First, check if the part of bcc they sent was zero */
 442                        if (tmp[sizeof(struct smb_hdr)] == 0) {
 443                                /* some servers return only half of bcc
 444                                 * on simple responses (wct, bcc both zero)
 445                                 * in particular have seen this on
 446                                 * ulogoffX and FindClose. This leaves
 447                                 * one byte of bcc potentially unitialized
 448                                 */
 449                                /* zero rest of bcc */
 450                                tmp[sizeof(struct smb_hdr)+1] = 0;
 451                                return 0;
 452                        }
 453                        cERROR(1, "rcvd invalid byte count (bcc)");
 454                } else {
 455                        cERROR(1, "Length less than smb header size");
 456                }
 457                return 1;
 458        }
 459        if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
 460                cERROR(1, "smb length greater than MaxBufSize, mid=%d",
 461                                   smb->Mid);
 462                return 1;
 463        }
 464
 465        if (check_smb_hdr(smb, mid))
 466                return 1;
 467        clc_len = smbCalcSize_LE(smb);
 468
 469        if (4 + len != length) {
 470                cERROR(1, "Length read does not match RFC1001 length %d",
 471                           len);
 472                return 1;
 473        }
 474
 475        if (4 + len != clc_len) {
 476                /* check if bcc wrapped around for large read responses */
 477                if ((len > 64 * 1024) && (len > clc_len)) {
 478                        /* check if lengths match mod 64K */
 479                        if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF))
 480                                return 0; /* bcc wrapped */
 481                }
 482                cFYI(1, "Calculated size %u vs length %u mismatch for mid=%u",
 483                                clc_len, 4 + len, smb->Mid);
 484
 485                if (4 + len < clc_len) {
 486                        cERROR(1, "RFC1001 size %u smaller than SMB for mid=%u",
 487                                        len, smb->Mid);
 488                        return 1;
 489                } else if (len > clc_len + 512) {
 490                        /*
 491                         * Some servers (Windows XP in particular) send more
 492                         * data than the lengths in the SMB packet would
 493                         * indicate on certain calls (byte range locks and
 494                         * trans2 find first calls in particular). While the
 495                         * client can handle such a frame by ignoring the
 496                         * trailing data, we choose limit the amount of extra
 497                         * data to 512 bytes.
 498                         */
 499                        cERROR(1, "RFC1001 size %u more than 512 bytes larger "
 500                                  "than SMB for mid=%u", len, smb->Mid);
 501                        return 1;
 502                }
 503        }
 504        return 0;
 505}
 506
 507bool
 508is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
 509{
 510        struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
 511        struct list_head *tmp, *tmp1, *tmp2;
 512        struct cifsSesInfo *ses;
 513        struct cifsTconInfo *tcon;
 514        struct cifsInodeInfo *pCifsInode;
 515        struct cifsFileInfo *netfile;
 516
 517        cFYI(1, "Checking for oplock break or dnotify response");
 518        if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
 519           (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
 520                struct smb_com_transaction_change_notify_rsp *pSMBr =
 521                        (struct smb_com_transaction_change_notify_rsp *)buf;
 522                struct file_notify_information *pnotify;
 523                __u32 data_offset = 0;
 524                if (get_bcc_le(buf) > sizeof(struct file_notify_information)) {
 525                        data_offset = le32_to_cpu(pSMBr->DataOffset);
 526
 527                        pnotify = (struct file_notify_information *)
 528                                ((char *)&pSMBr->hdr.Protocol + data_offset);
 529                        cFYI(1, "dnotify on %s Action: 0x%x",
 530                                 pnotify->FileName, pnotify->Action);
 531                        /*   cifs_dump_mem("Rcvd notify Data: ",buf,
 532                                sizeof(struct smb_hdr)+60); */
 533                        return true;
 534                }
 535                if (pSMBr->hdr.Status.CifsError) {
 536                        cFYI(1, "notify err 0x%d",
 537                                pSMBr->hdr.Status.CifsError);
 538                        return true;
 539                }
 540                return false;
 541        }
 542        if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
 543                return false;
 544        if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
 545                /* no sense logging error on invalid handle on oplock
 546                   break - harmless race between close request and oplock
 547                   break response is expected from time to time writing out
 548                   large dirty files cached on the client */
 549                if ((NT_STATUS_INVALID_HANDLE) ==
 550                   le32_to_cpu(pSMB->hdr.Status.CifsError)) {
 551                        cFYI(1, "invalid handle on oplock break");
 552                        return true;
 553                } else if (ERRbadfid ==
 554                   le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
 555                        return true;
 556                } else {
 557                        return false; /* on valid oplock brk we get "request" */
 558                }
 559        }
 560        if (pSMB->hdr.WordCount != 8)
 561                return false;
 562
 563        cFYI(1, "oplock type 0x%d level 0x%d",
 564                 pSMB->LockType, pSMB->OplockLevel);
 565        if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
 566                return false;
 567
 568        /* look up tcon based on tid & uid */
 569        spin_lock(&cifs_tcp_ses_lock);
 570        list_for_each(tmp, &srv->smb_ses_list) {
 571                ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 572                list_for_each(tmp1, &ses->tcon_list) {
 573                        tcon = list_entry(tmp1, struct cifsTconInfo, tcon_list);
 574                        if (tcon->tid != buf->Tid)
 575                                continue;
 576
 577                        cifs_stats_inc(&tcon->num_oplock_brks);
 578                        spin_lock(&cifs_file_list_lock);
 579                        list_for_each(tmp2, &tcon->openFileList) {
 580                                netfile = list_entry(tmp2, struct cifsFileInfo,
 581                                                     tlist);
 582                                if (pSMB->Fid != netfile->netfid)
 583                                        continue;
 584
 585                                cFYI(1, "file id match, oplock break");
 586                                pCifsInode = CIFS_I(netfile->dentry->d_inode);
 587
 588                                cifs_set_oplock_level(pCifsInode,
 589                                        pSMB->OplockLevel ? OPLOCK_READ : 0);
 590                                /*
 591                                 * cifs_oplock_break_put() can't be called
 592                                 * from here.  Get reference after queueing
 593                                 * succeeded.  cifs_oplock_break() will
 594                                 * synchronize using cifs_file_list_lock.
 595                                 */
 596                                if (queue_work(system_nrt_wq,
 597                                               &netfile->oplock_break))
 598                                        cifs_oplock_break_get(netfile);
 599                                netfile->oplock_break_cancelled = false;
 600
 601                                spin_unlock(&cifs_file_list_lock);
 602                                spin_unlock(&cifs_tcp_ses_lock);
 603                                return true;
 604                        }
 605                        spin_unlock(&cifs_file_list_lock);
 606                        spin_unlock(&cifs_tcp_ses_lock);
 607                        cFYI(1, "No matching file for oplock break");
 608                        return true;
 609                }
 610        }
 611        spin_unlock(&cifs_tcp_ses_lock);
 612        cFYI(1, "Can not process oplock break for non-existent connection");
 613        return true;
 614}
 615
 616void
 617dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
 618{
 619        int i, j;
 620        char debug_line[17];
 621        unsigned char *buffer;
 622
 623        if (traceSMB == 0)
 624                return;
 625
 626        buffer = (unsigned char *) smb_buf;
 627        for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
 628                if (i % 8 == 0) {
 629                        /* have reached the beginning of line */
 630                        printk(KERN_DEBUG "| ");
 631                        j = 0;
 632                }
 633                printk("%0#4x ", buffer[i]);
 634                debug_line[2 * j] = ' ';
 635                if (isprint(buffer[i]))
 636                        debug_line[1 + (2 * j)] = buffer[i];
 637                else
 638                        debug_line[1 + (2 * j)] = '_';
 639
 640                if (i % 8 == 7) {
 641                        /* reached end of line, time to print ascii */
 642                        debug_line[16] = 0;
 643                        printk(" | %s\n", debug_line);
 644                }
 645        }
 646        for (; j < 8; j++) {
 647                printk("     ");
 648                debug_line[2 * j] = ' ';
 649                debug_line[1 + (2 * j)] = ' ';
 650        }
 651        printk(" | %s\n", debug_line);
 652        return;
 653}
 654
 655void
 656cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
 657{
 658        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 659                cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 660                cERROR(1, "Autodisabling the use of server inode numbers on "
 661                           "%s. This server doesn't seem to support them "
 662                           "properly. Hardlinks will not be recognized on this "
 663                           "mount. Consider mounting with the \"noserverino\" "
 664                           "option to silence this message.",
 665                           cifs_sb_master_tcon(cifs_sb)->treeName);
 666        }
 667}
 668
 669void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
 670{
 671        oplock &= 0xF;
 672
 673        if (oplock == OPLOCK_EXCLUSIVE) {
 674                cinode->clientCanCacheAll = true;
 675                cinode->clientCanCacheRead = true;
 676                cFYI(1, "Exclusive Oplock granted on inode %p",
 677                     &cinode->vfs_inode);
 678        } else if (oplock == OPLOCK_READ) {
 679                cinode->clientCanCacheAll = false;
 680                cinode->clientCanCacheRead = true;
 681                cFYI(1, "Level II Oplock granted on inode %p",
 682                    &cinode->vfs_inode);
 683        } else {
 684                cinode->clientCanCacheAll = false;
 685                cinode->clientCanCacheRead = false;
 686        }
 687}
 688