linux/fs/cifs/smb1ops.c
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   1/*
   2 *  SMB1 (CIFS) version specific operations
   3 *
   4 *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
   5 *
   6 *  This library is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License v2 as published
   8 *  by the Free Software Foundation.
   9 *
  10 *  This library is distributed in the hope that it will be useful,
  11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13 *  the GNU Lesser General Public License for more details.
  14 *
  15 *  You should have received a copy of the GNU Lesser General Public License
  16 *  along with this library; if not, write to the Free Software
  17 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18 */
  19
  20#include <linux/pagemap.h>
  21#include <linux/vfs.h>
  22#include "cifsglob.h"
  23#include "cifsproto.h"
  24#include "cifs_debug.h"
  25#include "cifspdu.h"
  26
  27/*
  28 * An NT cancel request header looks just like the original request except:
  29 *
  30 * The Command is SMB_COM_NT_CANCEL
  31 * The WordCount is zeroed out
  32 * The ByteCount is zeroed out
  33 *
  34 * This function mangles an existing request buffer into a
  35 * SMB_COM_NT_CANCEL request and then sends it.
  36 */
  37static int
  38send_nt_cancel(struct TCP_Server_Info *server, void *buf,
  39               struct mid_q_entry *mid)
  40{
  41        int rc = 0;
  42        struct smb_hdr *in_buf = (struct smb_hdr *)buf;
  43
  44        /* -4 for RFC1001 length and +2 for BCC field */
  45        in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4  + 2);
  46        in_buf->Command = SMB_COM_NT_CANCEL;
  47        in_buf->WordCount = 0;
  48        put_bcc(0, in_buf);
  49
  50        mutex_lock(&server->srv_mutex);
  51        rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
  52        if (rc) {
  53                mutex_unlock(&server->srv_mutex);
  54                return rc;
  55        }
  56
  57        /*
  58         * The response to this call was already factored into the sequence
  59         * number when the call went out, so we must adjust it back downward
  60         * after signing here.
  61         */
  62        --server->sequence_number;
  63        rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
  64        mutex_unlock(&server->srv_mutex);
  65
  66        cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
  67                in_buf->Mid, rc);
  68
  69        return rc;
  70}
  71
  72static bool
  73cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
  74{
  75        return ob1->fid.netfid == ob2->fid.netfid;
  76}
  77
  78static unsigned int
  79cifs_read_data_offset(char *buf)
  80{
  81        READ_RSP *rsp = (READ_RSP *)buf;
  82        return le16_to_cpu(rsp->DataOffset);
  83}
  84
  85static unsigned int
  86cifs_read_data_length(char *buf)
  87{
  88        READ_RSP *rsp = (READ_RSP *)buf;
  89        return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
  90               le16_to_cpu(rsp->DataLength);
  91}
  92
  93static struct mid_q_entry *
  94cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
  95{
  96        struct smb_hdr *buf = (struct smb_hdr *)buffer;
  97        struct mid_q_entry *mid;
  98
  99        spin_lock(&GlobalMid_Lock);
 100        list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 101                if (mid->mid == buf->Mid &&
 102                    mid->mid_state == MID_REQUEST_SUBMITTED &&
 103                    le16_to_cpu(mid->command) == buf->Command) {
 104                        spin_unlock(&GlobalMid_Lock);
 105                        return mid;
 106                }
 107        }
 108        spin_unlock(&GlobalMid_Lock);
 109        return NULL;
 110}
 111
 112static void
 113cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
 114                 const int optype)
 115{
 116        spin_lock(&server->req_lock);
 117        server->credits += add;
 118        server->in_flight--;
 119        spin_unlock(&server->req_lock);
 120        wake_up(&server->request_q);
 121}
 122
 123static void
 124cifs_set_credits(struct TCP_Server_Info *server, const int val)
 125{
 126        spin_lock(&server->req_lock);
 127        server->credits = val;
 128        server->oplocks = val > 1 ? enable_oplocks : false;
 129        spin_unlock(&server->req_lock);
 130}
 131
 132static int *
 133cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
 134{
 135        return &server->credits;
 136}
 137
 138static unsigned int
 139cifs_get_credits(struct mid_q_entry *mid)
 140{
 141        return 1;
 142}
 143
 144/*
 145 * Find a free multiplex id (SMB mid). Otherwise there could be
 146 * mid collisions which might cause problems, demultiplexing the
 147 * wrong response to this request. Multiplex ids could collide if
 148 * one of a series requests takes much longer than the others, or
 149 * if a very large number of long lived requests (byte range
 150 * locks or FindNotify requests) are pending. No more than
 151 * 64K-1 requests can be outstanding at one time. If no
 152 * mids are available, return zero. A future optimization
 153 * could make the combination of mids and uid the key we use
 154 * to demultiplex on (rather than mid alone).
 155 * In addition to the above check, the cifs demultiplex
 156 * code already used the command code as a secondary
 157 * check of the frame and if signing is negotiated the
 158 * response would be discarded if the mid were the same
 159 * but the signature was wrong. Since the mid is not put in the
 160 * pending queue until later (when it is about to be dispatched)
 161 * we do have to limit the number of outstanding requests
 162 * to somewhat less than 64K-1 although it is hard to imagine
 163 * so many threads being in the vfs at one time.
 164 */
 165static __u64
 166cifs_get_next_mid(struct TCP_Server_Info *server)
 167{
 168        __u64 mid = 0;
 169        __u16 last_mid, cur_mid;
 170        bool collision;
 171
 172        spin_lock(&GlobalMid_Lock);
 173
 174        /* mid is 16 bit only for CIFS/SMB */
 175        cur_mid = (__u16)((server->CurrentMid) & 0xffff);
 176        /* we do not want to loop forever */
 177        last_mid = cur_mid;
 178        cur_mid++;
 179
 180        /*
 181         * This nested loop looks more expensive than it is.
 182         * In practice the list of pending requests is short,
 183         * fewer than 50, and the mids are likely to be unique
 184         * on the first pass through the loop unless some request
 185         * takes longer than the 64 thousand requests before it
 186         * (and it would also have to have been a request that
 187         * did not time out).
 188         */
 189        while (cur_mid != last_mid) {
 190                struct mid_q_entry *mid_entry;
 191                unsigned int num_mids;
 192
 193                collision = false;
 194                if (cur_mid == 0)
 195                        cur_mid++;
 196
 197                num_mids = 0;
 198                list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
 199                        ++num_mids;
 200                        if (mid_entry->mid == cur_mid &&
 201                            mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
 202                                /* This mid is in use, try a different one */
 203                                collision = true;
 204                                break;
 205                        }
 206                }
 207
 208                /*
 209                 * if we have more than 32k mids in the list, then something
 210                 * is very wrong. Possibly a local user is trying to DoS the
 211                 * box by issuing long-running calls and SIGKILL'ing them. If
 212                 * we get to 2^16 mids then we're in big trouble as this
 213                 * function could loop forever.
 214                 *
 215                 * Go ahead and assign out the mid in this situation, but force
 216                 * an eventual reconnect to clean out the pending_mid_q.
 217                 */
 218                if (num_mids > 32768)
 219                        server->tcpStatus = CifsNeedReconnect;
 220
 221                if (!collision) {
 222                        mid = (__u64)cur_mid;
 223                        server->CurrentMid = mid;
 224                        break;
 225                }
 226                cur_mid++;
 227        }
 228        spin_unlock(&GlobalMid_Lock);
 229        return mid;
 230}
 231
 232/*
 233        return codes:
 234                0       not a transact2, or all data present
 235                >0      transact2 with that much data missing
 236                -EINVAL invalid transact2
 237 */
 238static int
 239check2ndT2(char *buf)
 240{
 241        struct smb_hdr *pSMB = (struct smb_hdr *)buf;
 242        struct smb_t2_rsp *pSMBt;
 243        int remaining;
 244        __u16 total_data_size, data_in_this_rsp;
 245
 246        if (pSMB->Command != SMB_COM_TRANSACTION2)
 247                return 0;
 248
 249        /* check for plausible wct, bcc and t2 data and parm sizes */
 250        /* check for parm and data offset going beyond end of smb */
 251        if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 252                cFYI(1, "invalid transact2 word count");
 253                return -EINVAL;
 254        }
 255
 256        pSMBt = (struct smb_t2_rsp *)pSMB;
 257
 258        total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
 259        data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
 260
 261        if (total_data_size == data_in_this_rsp)
 262                return 0;
 263        else if (total_data_size < data_in_this_rsp) {
 264                cFYI(1, "total data %d smaller than data in frame %d",
 265                        total_data_size, data_in_this_rsp);
 266                return -EINVAL;
 267        }
 268
 269        remaining = total_data_size - data_in_this_rsp;
 270
 271        cFYI(1, "missing %d bytes from transact2, check next response",
 272                remaining);
 273        if (total_data_size > CIFSMaxBufSize) {
 274                cERROR(1, "TotalDataSize %d is over maximum buffer %d",
 275                        total_data_size, CIFSMaxBufSize);
 276                return -EINVAL;
 277        }
 278        return remaining;
 279}
 280
 281static int
 282coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
 283{
 284        struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
 285        struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)target_hdr;
 286        char *data_area_of_tgt;
 287        char *data_area_of_src;
 288        int remaining;
 289        unsigned int byte_count, total_in_tgt;
 290        __u16 tgt_total_cnt, src_total_cnt, total_in_src;
 291
 292        src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
 293        tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
 294
 295        if (tgt_total_cnt != src_total_cnt)
 296                cFYI(1, "total data count of primary and secondary t2 differ "
 297                        "source=%hu target=%hu", src_total_cnt, tgt_total_cnt);
 298
 299        total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
 300
 301        remaining = tgt_total_cnt - total_in_tgt;
 302
 303        if (remaining < 0) {
 304                cFYI(1, "Server sent too much data. tgt_total_cnt=%hu "
 305                        "total_in_tgt=%hu", tgt_total_cnt, total_in_tgt);
 306                return -EPROTO;
 307        }
 308
 309        if (remaining == 0) {
 310                /* nothing to do, ignore */
 311                cFYI(1, "no more data remains");
 312                return 0;
 313        }
 314
 315        total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
 316        if (remaining < total_in_src)
 317                cFYI(1, "transact2 2nd response contains too much data");
 318
 319        /* find end of first SMB data area */
 320        data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
 321                                get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
 322
 323        /* validate target area */
 324        data_area_of_src = (char *)&pSMBs->hdr.Protocol +
 325                                get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
 326
 327        data_area_of_tgt += total_in_tgt;
 328
 329        total_in_tgt += total_in_src;
 330        /* is the result too big for the field? */
 331        if (total_in_tgt > USHRT_MAX) {
 332                cFYI(1, "coalesced DataCount too large (%u)", total_in_tgt);
 333                return -EPROTO;
 334        }
 335        put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
 336
 337        /* fix up the BCC */
 338        byte_count = get_bcc(target_hdr);
 339        byte_count += total_in_src;
 340        /* is the result too big for the field? */
 341        if (byte_count > USHRT_MAX) {
 342                cFYI(1, "coalesced BCC too large (%u)", byte_count);
 343                return -EPROTO;
 344        }
 345        put_bcc(byte_count, target_hdr);
 346
 347        byte_count = be32_to_cpu(target_hdr->smb_buf_length);
 348        byte_count += total_in_src;
 349        /* don't allow buffer to overflow */
 350        if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
 351                cFYI(1, "coalesced BCC exceeds buffer size (%u)", byte_count);
 352                return -ENOBUFS;
 353        }
 354        target_hdr->smb_buf_length = cpu_to_be32(byte_count);
 355
 356        /* copy second buffer into end of first buffer */
 357        memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
 358
 359        if (remaining != total_in_src) {
 360                /* more responses to go */
 361                cFYI(1, "waiting for more secondary responses");
 362                return 1;
 363        }
 364
 365        /* we are done */
 366        cFYI(1, "found the last secondary response");
 367        return 0;
 368}
 369
 370static bool
 371cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
 372                  char *buf, int malformed)
 373{
 374        if (malformed)
 375                return false;
 376        if (check2ndT2(buf) <= 0)
 377                return false;
 378        mid->multiRsp = true;
 379        if (mid->resp_buf) {
 380                /* merge response - fix up 1st*/
 381                malformed = coalesce_t2(buf, mid->resp_buf);
 382                if (malformed > 0)
 383                        return true;
 384                /* All parts received or packet is malformed. */
 385                mid->multiEnd = true;
 386                dequeue_mid(mid, malformed);
 387                return true;
 388        }
 389        if (!server->large_buf) {
 390                /*FIXME: switch to already allocated largebuf?*/
 391                cERROR(1, "1st trans2 resp needs bigbuf");
 392        } else {
 393                /* Have first buffer */
 394                mid->resp_buf = buf;
 395                mid->large_buf = true;
 396                server->bigbuf = NULL;
 397        }
 398        return true;
 399}
 400
 401static bool
 402cifs_need_neg(struct TCP_Server_Info *server)
 403{
 404        return server->maxBuf == 0;
 405}
 406
 407static int
 408cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
 409{
 410        int rc;
 411        rc = CIFSSMBNegotiate(xid, ses);
 412        if (rc == -EAGAIN) {
 413                /* retry only once on 1st time connection */
 414                set_credits(ses->server, 1);
 415                rc = CIFSSMBNegotiate(xid, ses);
 416                if (rc == -EAGAIN)
 417                        rc = -EHOSTDOWN;
 418        }
 419        return rc;
 420}
 421
 422static unsigned int
 423cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 424{
 425        __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
 426        struct TCP_Server_Info *server = tcon->ses->server;
 427        unsigned int wsize;
 428
 429        /* start with specified wsize, or default */
 430        if (volume_info->wsize)
 431                wsize = volume_info->wsize;
 432        else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
 433                wsize = CIFS_DEFAULT_IOSIZE;
 434        else
 435                wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
 436
 437        /* can server support 24-bit write sizes? (via UNIX extensions) */
 438        if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
 439                wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
 440
 441        /*
 442         * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
 443         * Limit it to max buffer offered by the server, minus the size of the
 444         * WRITEX header, not including the 4 byte RFC1001 length.
 445         */
 446        if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
 447            (!(server->capabilities & CAP_UNIX) &&
 448             (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
 449                wsize = min_t(unsigned int, wsize,
 450                                server->maxBuf - sizeof(WRITE_REQ) + 4);
 451
 452        /* hard limit of CIFS_MAX_WSIZE */
 453        wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
 454
 455        return wsize;
 456}
 457
 458static unsigned int
 459cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 460{
 461        __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
 462        struct TCP_Server_Info *server = tcon->ses->server;
 463        unsigned int rsize, defsize;
 464
 465        /*
 466         * Set default value...
 467         *
 468         * HACK alert! Ancient servers have very small buffers. Even though
 469         * MS-CIFS indicates that servers are only limited by the client's
 470         * bufsize for reads, testing against win98se shows that it throws
 471         * INVALID_PARAMETER errors if you try to request too large a read.
 472         * OS/2 just sends back short reads.
 473         *
 474         * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
 475         * it can't handle a read request larger than its MaxBufferSize either.
 476         */
 477        if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
 478                defsize = CIFS_DEFAULT_IOSIZE;
 479        else if (server->capabilities & CAP_LARGE_READ_X)
 480                defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
 481        else
 482                defsize = server->maxBuf - sizeof(READ_RSP);
 483
 484        rsize = volume_info->rsize ? volume_info->rsize : defsize;
 485
 486        /*
 487         * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
 488         * the client's MaxBufferSize.
 489         */
 490        if (!(server->capabilities & CAP_LARGE_READ_X))
 491                rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
 492
 493        /* hard limit of CIFS_MAX_RSIZE */
 494        rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
 495
 496        return rsize;
 497}
 498
 499static void
 500cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 501{
 502        CIFSSMBQFSDeviceInfo(xid, tcon);
 503        CIFSSMBQFSAttributeInfo(xid, tcon);
 504}
 505
 506static int
 507cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 508                        struct cifs_sb_info *cifs_sb, const char *full_path)
 509{
 510        int rc;
 511        FILE_ALL_INFO *file_info;
 512
 513        file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 514        if (file_info == NULL)
 515                return -ENOMEM;
 516
 517        rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
 518                              0 /* not legacy */, cifs_sb->local_nls,
 519                              cifs_sb->mnt_cifs_flags &
 520                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 521
 522        if (rc == -EOPNOTSUPP || rc == -EINVAL)
 523                rc = SMBQueryInformation(xid, tcon, full_path, file_info,
 524                                cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 525                                  CIFS_MOUNT_MAP_SPECIAL_CHR);
 526        kfree(file_info);
 527        return rc;
 528}
 529
 530static int
 531cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 532                     struct cifs_sb_info *cifs_sb, const char *full_path,
 533                     FILE_ALL_INFO *data, bool *adjustTZ)
 534{
 535        int rc;
 536
 537        /* could do find first instead but this returns more info */
 538        rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
 539                              cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 540                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 541        /*
 542         * BB optimize code so we do not make the above call when server claims
 543         * no NT SMB support and the above call failed at least once - set flag
 544         * in tcon or mount.
 545         */
 546        if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 547                rc = SMBQueryInformation(xid, tcon, full_path, data,
 548                                         cifs_sb->local_nls,
 549                                         cifs_sb->mnt_cifs_flags &
 550                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 551                *adjustTZ = true;
 552        }
 553        return rc;
 554}
 555
 556static int
 557cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 558                  struct cifs_sb_info *cifs_sb, const char *full_path,
 559                  u64 *uniqueid, FILE_ALL_INFO *data)
 560{
 561        /*
 562         * We can not use the IndexNumber field by default from Windows or
 563         * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
 564         * CIFS spec claims that this value is unique within the scope of a
 565         * share, and the windows docs hint that it's actually unique
 566         * per-machine.
 567         *
 568         * There may be higher info levels that work but are there Windows
 569         * server or network appliances for which IndexNumber field is not
 570         * guaranteed unique?
 571         */
 572        return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
 573                                     cifs_sb->local_nls,
 574                                     cifs_sb->mnt_cifs_flags &
 575                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 576}
 577
 578static int
 579cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 580                     struct cifs_fid *fid, FILE_ALL_INFO *data)
 581{
 582        return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
 583}
 584
 585static char *
 586cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
 587                        struct cifs_tcon *tcon)
 588{
 589        int pplen = vol->prepath ? strlen(vol->prepath) : 0;
 590        int dfsplen;
 591        char *full_path = NULL;
 592
 593        /* if no prefix path, simply set path to the root of share to "" */
 594        if (pplen == 0) {
 595                full_path = kzalloc(1, GFP_KERNEL);
 596                return full_path;
 597        }
 598
 599        if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
 600                dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
 601        else
 602                dfsplen = 0;
 603
 604        full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
 605        if (full_path == NULL)
 606                return full_path;
 607
 608        if (dfsplen)
 609                strncpy(full_path, tcon->treeName, dfsplen);
 610        strncpy(full_path + dfsplen, vol->prepath, pplen);
 611        convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
 612        full_path[dfsplen + pplen] = 0; /* add trailing null */
 613        return full_path;
 614}
 615
 616static void
 617cifs_clear_stats(struct cifs_tcon *tcon)
 618{
 619#ifdef CONFIG_CIFS_STATS
 620        atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
 621        atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
 622        atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
 623        atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
 624        atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
 625        atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
 626        atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
 627        atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
 628        atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
 629        atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
 630        atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
 631        atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
 632        atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
 633        atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
 634        atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
 635        atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
 636        atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
 637        atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
 638        atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
 639        atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
 640        atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
 641#endif
 642}
 643
 644static void
 645cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 646{
 647#ifdef CONFIG_CIFS_STATS
 648        seq_printf(m, " Oplocks breaks: %d",
 649                   atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
 650        seq_printf(m, "\nReads:  %d Bytes: %llu",
 651                   atomic_read(&tcon->stats.cifs_stats.num_reads),
 652                   (long long)(tcon->bytes_read));
 653        seq_printf(m, "\nWrites: %d Bytes: %llu",
 654                   atomic_read(&tcon->stats.cifs_stats.num_writes),
 655                   (long long)(tcon->bytes_written));
 656        seq_printf(m, "\nFlushes: %d",
 657                   atomic_read(&tcon->stats.cifs_stats.num_flushes));
 658        seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
 659                   atomic_read(&tcon->stats.cifs_stats.num_locks),
 660                   atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
 661                   atomic_read(&tcon->stats.cifs_stats.num_symlinks));
 662        seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
 663                   atomic_read(&tcon->stats.cifs_stats.num_opens),
 664                   atomic_read(&tcon->stats.cifs_stats.num_closes),
 665                   atomic_read(&tcon->stats.cifs_stats.num_deletes));
 666        seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
 667                   atomic_read(&tcon->stats.cifs_stats.num_posixopens),
 668                   atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
 669        seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
 670                   atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
 671                   atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
 672        seq_printf(m, "\nRenames: %d T2 Renames %d",
 673                   atomic_read(&tcon->stats.cifs_stats.num_renames),
 674                   atomic_read(&tcon->stats.cifs_stats.num_t2renames));
 675        seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
 676                   atomic_read(&tcon->stats.cifs_stats.num_ffirst),
 677                   atomic_read(&tcon->stats.cifs_stats.num_fnext),
 678                   atomic_read(&tcon->stats.cifs_stats.num_fclose));
 679#endif
 680}
 681
 682static void
 683cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
 684                   struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 685                   const unsigned int xid)
 686{
 687        FILE_BASIC_INFO info;
 688        struct cifsInodeInfo *cifsInode;
 689        u32 dosattrs;
 690        int rc;
 691
 692        memset(&info, 0, sizeof(info));
 693        cifsInode = CIFS_I(inode);
 694        dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
 695        info.Attributes = cpu_to_le32(dosattrs);
 696        rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
 697                                cifs_sb->mnt_cifs_flags &
 698                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 699        if (rc == 0)
 700                cifsInode->cifsAttrs = dosattrs;
 701}
 702
 703static int
 704cifs_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
 705               int disposition, int desired_access, int create_options,
 706               struct cifs_fid *fid, __u32 *oplock, FILE_ALL_INFO *buf,
 707               struct cifs_sb_info *cifs_sb)
 708{
 709        if (!(tcon->ses->capabilities & CAP_NT_SMBS))
 710                return SMBLegacyOpen(xid, tcon, path, disposition,
 711                                     desired_access, create_options,
 712                                     &fid->netfid, oplock, buf,
 713                                     cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
 714                                                & CIFS_MOUNT_MAP_SPECIAL_CHR);
 715        return CIFSSMBOpen(xid, tcon, path, disposition, desired_access,
 716                           create_options, &fid->netfid, oplock, buf,
 717                           cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 718                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 719}
 720
 721static void
 722cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
 723{
 724        struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
 725        cfile->fid.netfid = fid->netfid;
 726        cifs_set_oplock_level(cinode, oplock);
 727        cinode->can_cache_brlcks = cinode->clientCanCacheAll;
 728}
 729
 730static void
 731cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
 732                struct cifs_fid *fid)
 733{
 734        CIFSSMBClose(xid, tcon, fid->netfid);
 735}
 736
 737static int
 738cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
 739                struct cifs_fid *fid)
 740{
 741        return CIFSSMBFlush(xid, tcon, fid->netfid);
 742}
 743
 744static int
 745cifs_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
 746               struct cifs_io_parms *parms, unsigned int *bytes_read,
 747               char **buf, int *buf_type)
 748{
 749        parms->netfid = cfile->fid.netfid;
 750        return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
 751}
 752
 753static int
 754cifs_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
 755                struct cifs_io_parms *parms, unsigned int *written,
 756                struct kvec *iov, unsigned long nr_segs)
 757{
 758
 759        parms->netfid = cfile->fid.netfid;
 760        return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
 761}
 762
 763static int
 764smb_set_file_info(struct inode *inode, const char *full_path,
 765                  FILE_BASIC_INFO *buf, const unsigned int xid)
 766{
 767        int oplock = 0;
 768        int rc;
 769        __u16 netfid;
 770        __u32 netpid;
 771        struct cifsFileInfo *open_file;
 772        struct cifsInodeInfo *cinode = CIFS_I(inode);
 773        struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 774        struct tcon_link *tlink = NULL;
 775        struct cifs_tcon *tcon;
 776
 777        /* if the file is already open for write, just use that fileid */
 778        open_file = find_writable_file(cinode, true);
 779        if (open_file) {
 780                netfid = open_file->fid.netfid;
 781                netpid = open_file->pid;
 782                tcon = tlink_tcon(open_file->tlink);
 783                goto set_via_filehandle;
 784        }
 785
 786        tlink = cifs_sb_tlink(cifs_sb);
 787        if (IS_ERR(tlink)) {
 788                rc = PTR_ERR(tlink);
 789                tlink = NULL;
 790                goto out;
 791        }
 792        tcon = tlink_tcon(tlink);
 793
 794        /*
 795         * NT4 apparently returns success on this call, but it doesn't really
 796         * work.
 797         */
 798        if (!(tcon->ses->flags & CIFS_SES_NT4)) {
 799                rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf,
 800                                        cifs_sb->local_nls,
 801                                        cifs_sb->mnt_cifs_flags &
 802                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 803                if (rc == 0) {
 804                        cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
 805                        goto out;
 806                } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
 807                        goto out;
 808        }
 809
 810        cFYI(1, "calling SetFileInfo since SetPathInfo for times not supported "
 811                "by this server");
 812        rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 813                         SYNCHRONIZE | FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
 814                         &netfid, &oplock, NULL, cifs_sb->local_nls,
 815                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 816
 817        if (rc != 0) {
 818                if (rc == -EIO)
 819                        rc = -EINVAL;
 820                goto out;
 821        }
 822
 823        netpid = current->tgid;
 824
 825set_via_filehandle:
 826        rc = CIFSSMBSetFileInfo(xid, tcon, buf, netfid, netpid);
 827        if (!rc)
 828                cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
 829
 830        if (open_file == NULL)
 831                CIFSSMBClose(xid, tcon, netfid);
 832        else
 833                cifsFileInfo_put(open_file);
 834out:
 835        if (tlink != NULL)
 836                cifs_put_tlink(tlink);
 837        return rc;
 838}
 839
 840static int
 841cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
 842                     const char *path, struct cifs_sb_info *cifs_sb,
 843                     struct cifs_fid *fid, __u16 search_flags,
 844                     struct cifs_search_info *srch_inf)
 845{
 846        return CIFSFindFirst(xid, tcon, path, cifs_sb,
 847                             &fid->netfid, search_flags, srch_inf, true);
 848}
 849
 850static int
 851cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
 852                    struct cifs_fid *fid, __u16 search_flags,
 853                    struct cifs_search_info *srch_inf)
 854{
 855        return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
 856}
 857
 858static int
 859cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
 860               struct cifs_fid *fid)
 861{
 862        return CIFSFindClose(xid, tcon, fid->netfid);
 863}
 864
 865static int
 866cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
 867                     struct cifsInodeInfo *cinode)
 868{
 869        return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0,
 870                           LOCKING_ANDX_OPLOCK_RELEASE, false,
 871                           cinode->clientCanCacheRead ? 1 : 0);
 872}
 873
 874static int
 875cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
 876             struct kstatfs *buf)
 877{
 878        int rc = -EOPNOTSUPP;
 879
 880        buf->f_type = CIFS_MAGIC_NUMBER;
 881
 882        /*
 883         * We could add a second check for a QFS Unix capability bit
 884         */
 885        if ((tcon->ses->capabilities & CAP_UNIX) &&
 886            (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 887                rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 888
 889        /*
 890         * Only need to call the old QFSInfo if failed on newer one,
 891         * e.g. by OS/2.
 892         **/
 893        if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 894                rc = CIFSSMBQFSInfo(xid, tcon, buf);
 895
 896        /*
 897         * Some old Windows servers also do not support level 103, retry with
 898         * older level one if old server failed the previous call or we
 899         * bypassed it because we detected that this was an older LANMAN sess
 900         */
 901        if (rc)
 902                rc = SMBOldQFSInfo(xid, tcon, buf);
 903        return rc;
 904}
 905
 906static int
 907cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
 908               __u64 length, __u32 type, int lock, int unlock, bool wait)
 909{
 910        return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
 911                           current->tgid, length, offset, unlock, lock,
 912                           (__u8)type, wait, 0);
 913}
 914
 915struct smb_version_operations smb1_operations = {
 916        .send_cancel = send_nt_cancel,
 917        .compare_fids = cifs_compare_fids,
 918        .setup_request = cifs_setup_request,
 919        .setup_async_request = cifs_setup_async_request,
 920        .check_receive = cifs_check_receive,
 921        .add_credits = cifs_add_credits,
 922        .set_credits = cifs_set_credits,
 923        .get_credits_field = cifs_get_credits_field,
 924        .get_credits = cifs_get_credits,
 925        .get_next_mid = cifs_get_next_mid,
 926        .read_data_offset = cifs_read_data_offset,
 927        .read_data_length = cifs_read_data_length,
 928        .map_error = map_smb_to_linux_error,
 929        .find_mid = cifs_find_mid,
 930        .check_message = checkSMB,
 931        .dump_detail = cifs_dump_detail,
 932        .clear_stats = cifs_clear_stats,
 933        .print_stats = cifs_print_stats,
 934        .is_oplock_break = is_valid_oplock_break,
 935        .check_trans2 = cifs_check_trans2,
 936        .need_neg = cifs_need_neg,
 937        .negotiate = cifs_negotiate,
 938        .negotiate_wsize = cifs_negotiate_wsize,
 939        .negotiate_rsize = cifs_negotiate_rsize,
 940        .sess_setup = CIFS_SessSetup,
 941        .logoff = CIFSSMBLogoff,
 942        .tree_connect = CIFSTCon,
 943        .tree_disconnect = CIFSSMBTDis,
 944        .get_dfs_refer = CIFSGetDFSRefer,
 945        .qfs_tcon = cifs_qfs_tcon,
 946        .is_path_accessible = cifs_is_path_accessible,
 947        .query_path_info = cifs_query_path_info,
 948        .query_file_info = cifs_query_file_info,
 949        .get_srv_inum = cifs_get_srv_inum,
 950        .set_path_size = CIFSSMBSetEOF,
 951        .set_file_size = CIFSSMBSetFileSize,
 952        .set_file_info = smb_set_file_info,
 953        .build_path_to_root = cifs_build_path_to_root,
 954        .echo = CIFSSMBEcho,
 955        .mkdir = CIFSSMBMkDir,
 956        .mkdir_setinfo = cifs_mkdir_setinfo,
 957        .rmdir = CIFSSMBRmDir,
 958        .unlink = CIFSSMBDelFile,
 959        .rename_pending_delete = cifs_rename_pending_delete,
 960        .rename = CIFSSMBRename,
 961        .create_hardlink = CIFSCreateHardLink,
 962        .open = cifs_open_file,
 963        .set_fid = cifs_set_fid,
 964        .close = cifs_close_file,
 965        .flush = cifs_flush_file,
 966        .async_readv = cifs_async_readv,
 967        .async_writev = cifs_async_writev,
 968        .sync_read = cifs_sync_read,
 969        .sync_write = cifs_sync_write,
 970        .query_dir_first = cifs_query_dir_first,
 971        .query_dir_next = cifs_query_dir_next,
 972        .close_dir = cifs_close_dir,
 973        .calc_smb_size = smbCalcSize,
 974        .oplock_response = cifs_oplock_response,
 975        .queryfs = cifs_queryfs,
 976        .mand_lock = cifs_mand_lock,
 977        .mand_unlock_range = cifs_unlock_range,
 978        .push_mand_locks = cifs_push_mandatory_locks,
 979};
 980
 981struct smb_version_values smb1_values = {
 982        .version_string = SMB1_VERSION_STRING,
 983        .large_lock_type = LOCKING_ANDX_LARGE_FILES,
 984        .exclusive_lock_type = 0,
 985        .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
 986        .unlock_lock_type = 0,
 987        .header_size = sizeof(struct smb_hdr),
 988        .max_header_size = MAX_CIFS_HDR_SIZE,
 989        .read_rsp_size = sizeof(READ_RSP),
 990        .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
 991        .cap_unix = CAP_UNIX,
 992        .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
 993        .cap_large_files = CAP_LARGE_FILES,
 994};
 995
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