fs/smb/client/dfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2022 Paulo Alcantara <palcantara@suse.de>
   4  */
   5
   6 #include "cifsproto.h"
   7 #include "cifs_debug.h"
   8 #include "dns_resolve.h"
   9 #include "fs_context.h"
  10 #include "dfs.h"
  11
  12 /**
  13  * dfs_parse_target_referral - set fs context for dfs target referral
  14  *
  15  * @full_path: full path in UNC format.
  16  * @ref: dfs referral pointer.
  17  * @ctx: smb3 fs context pointer.
  18  *
  19  * Return zero if dfs referral was parsed correctly, otherwise non-zero.
  20  */
  21 int dfs_parse_target_referral(const char *full_path, const struct dfs_info3_param *ref,
  22                               struct smb3_fs_context *ctx)
  23 {
  24         int rc;
  25         const char *prepath = NULL;
  26         char *path;
  27
  28         if (!full_path || !*full_path || !ref || !ctx)
  29                 return -EINVAL;
  30
  31         if (WARN_ON_ONCE(!ref->node_name || ref->path_consumed < 0))
  32                 return -EINVAL;
  33
  34         if (strlen(full_path) - ref->path_consumed) {
  35                 prepath = full_path + ref->path_consumed;
  36                 /* skip initial delimiter */
  37                 if (*prepath == '/' || *prepath == '\\')
  38                         prepath++;
  39         }
  40
  41         path = cifs_build_devname(ref->node_name, prepath);
  42         if (IS_ERR(path))
  43                 return PTR_ERR(path);
  44
  45         rc = smb3_parse_devname(path, ctx);
  46         if (rc)
  47                 goto out;
  48
  49         rc = dns_resolve_server_name_to_ip(path, (struct sockaddr *)&ctx->dstaddr, NULL);
  50
  51 out:
  52         kfree(path);
  53         return rc;
  54 }
  55
  56 static int get_session(struct cifs_mount_ctx *mnt_ctx, const char *full_path)
  57 {
  58         struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
  59         int rc;
  60
  61         ctx->leaf_fullpath = (char *)full_path;
  62         rc = cifs_mount_get_session(mnt_ctx);
  63         ctx->leaf_fullpath = NULL;
  64
  65         return rc;
  66 }
  67
  68 /*
  69  * Track individual DFS referral servers used by new DFS mount.
  70  *
  71  * On success, their lifetime will be shared by final tcon (dfs_ses_list).
  72  * Otherwise, they will be put by dfs_put_root_smb_sessions() in cifs_mount().
  73  */
  74 static int add_root_smb_session(struct cifs_mount_ctx *mnt_ctx)
  75 {
  76         struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
  77         struct dfs_root_ses *root_ses;
  78         struct cifs_ses *ses = mnt_ctx->ses;
  79
  80         if (ses) {
  81                 root_ses = kmalloc(sizeof(*root_ses), GFP_KERNEL);
  82                 if (!root_ses)
  83                         return -ENOMEM;
  84
  85                 INIT_LIST_HEAD(&root_ses->list);
  86
  87                 spin_lock(&cifs_tcp_ses_lock);
  88                 cifs_smb_ses_inc_refcount(ses);
  89                 spin_unlock(&cifs_tcp_ses_lock);
  90                 root_ses->ses = ses;
  91                 list_add_tail(&root_ses->list, &mnt_ctx->dfs_ses_list);
  92         }
  93         /* Select new DFS referral server so that new referrals go through it */
  94         ctx->dfs_root_ses = ses;
  95         return 0;
  96 }
  97
  98 static inline int parse_dfs_target(struct smb3_fs_context *ctx,
  99                                    struct dfs_ref_walk *rw,
 100                                    struct dfs_info3_param *tgt)
 101 {
 102         int rc;
 103         const char *fpath = ref_walk_fpath(rw) + 1;
 104
 105         rc = ref_walk_get_tgt(rw, tgt);
 106         if (!rc)
 107                 rc = dfs_parse_target_referral(fpath, tgt, ctx);
 108         return rc;
 109 }
 110
 111 static int set_ref_paths(struct cifs_mount_ctx *mnt_ctx,
 112                          struct dfs_info3_param *tgt,
 113                          struct dfs_ref_walk *rw)
 114 {
 115         struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
 116         struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
 117         char *ref_path, *full_path;
 118         int rc;
 119
 120         full_path = smb3_fs_context_fullpath(ctx, CIFS_DIR_SEP(cifs_sb));
 121         if (IS_ERR(full_path))
 122                 return PTR_ERR(full_path);
 123
 124         if (!tgt || (tgt->server_type == DFS_TYPE_LINK &&
 125                      DFS_INTERLINK(tgt->flags)))
 126                 ref_path = dfs_get_path(cifs_sb, ctx->UNC);
 127         else
 128                 ref_path = dfs_get_path(cifs_sb, full_path);
 129         if (IS_ERR(ref_path)) {
 130                 rc = PTR_ERR(ref_path);
 131                 kfree(full_path);
 132                 return rc;
 133         }
 134         ref_walk_path(rw) = ref_path;
 135         ref_walk_fpath(rw) = full_path;
 136         return 0;
 137 }
 138
 139 static int __dfs_referral_walk(struct cifs_mount_ctx *mnt_ctx,
 140                                struct dfs_ref_walk *rw)
 141 {
 142         struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
 143         struct dfs_info3_param tgt = {};
 144         bool is_refsrv;
 145         int rc = -ENOENT;
 146
 147 again:
 148         do {
 149                 if (ref_walk_empty(rw)) {
 150                         rc = dfs_get_referral(mnt_ctx, ref_walk_path(rw) + 1,
 151                                               NULL, ref_walk_tl(rw));
 152                         if (rc) {
 153                                 rc = cifs_mount_get_tcon(mnt_ctx);
 154                                 if (!rc)
 155                                         rc = cifs_is_path_remote(mnt_ctx);
 156                                 continue;
 157                         }
 158                         if (!ref_walk_num_tgts(rw)) {
 159                                 rc = -ENOENT;
 160                                 continue;
 161                         }
 162                 }
 163
 164                 while (ref_walk_next_tgt(rw)) {
 165                         rc = parse_dfs_target(ctx, rw, &tgt);
 166                         if (rc)
 167                                 continue;
 168
 169                         cifs_mount_put_conns(mnt_ctx);
 170                         rc = get_session(mnt_ctx, ref_walk_path(rw));
 171                         if (rc)
 172                                 continue;
 173
 174                         is_refsrv = tgt.server_type == DFS_TYPE_ROOT ||
 175                                 DFS_INTERLINK(tgt.flags);
 176                         ref_walk_set_tgt_hint(rw);
 177
 178                         if (tgt.flags & DFSREF_STORAGE_SERVER) {
 179                                 rc = cifs_mount_get_tcon(mnt_ctx);
 180                                 if (!rc)
 181                                         rc = cifs_is_path_remote(mnt_ctx);
 182                                 if (!rc)
 183                                         break;
 184                                 if (rc != -EREMOTE)
 185                                         continue;
 186                         }
 187
 188                         if (is_refsrv) {
 189                                 rc = add_root_smb_session(mnt_ctx);
 190                                 if (rc)
 191                                         goto out;
 192                         }
 193
 194                         rc = ref_walk_advance(rw);
 195                         if (!rc) {
 196                                 rc = set_ref_paths(mnt_ctx, &tgt, rw);
 197                                 if (!rc) {
 198                                         rc = -EREMOTE;
 199                                         goto again;
 200                                 }
 201                         }
 202                         if (rc != -ELOOP)
 203                                 goto out;
 204                 }
 205         } while (rc && ref_walk_descend(rw));
 206
 207 out:
 208         free_dfs_info_param(&tgt);
 209         return rc;
 210 }
 211
 212 static int dfs_referral_walk(struct cifs_mount_ctx *mnt_ctx)
 213 {
 214         struct dfs_ref_walk *rw;
 215         int rc;
 216
 217         rw = ref_walk_alloc();
 218         if (IS_ERR(rw))
 219                 return PTR_ERR(rw);
 220
 221         ref_walk_init(rw);
 222         rc = set_ref_paths(mnt_ctx, NULL, rw);
 223         if (!rc)
 224                 rc = __dfs_referral_walk(mnt_ctx, rw);
 225         ref_walk_free(rw);
 226         return rc;
 227 }
 228
 229 static int __dfs_mount_share(struct cifs_mount_ctx *mnt_ctx)
 230 {
 231         struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
 232         struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
 233         struct cifs_tcon *tcon;
 234         char *origin_fullpath;
 235         int rc;
 236
 237         origin_fullpath = dfs_get_path(cifs_sb, ctx->source);
 238         if (IS_ERR(origin_fullpath))
 239                 return PTR_ERR(origin_fullpath);
 240
 241         rc = dfs_referral_walk(mnt_ctx);
 242         if (rc)
 243                 goto out;
 244
 245         tcon = mnt_ctx->tcon;
 246         spin_lock(&tcon->tc_lock);
 247         if (!tcon->origin_fullpath) {
 248                 tcon->origin_fullpath = origin_fullpath;
 249                 origin_fullpath = NULL;
 250         }
 251         spin_unlock(&tcon->tc_lock);
 252
 253         if (list_empty(&tcon->dfs_ses_list)) {
 254                 list_replace_init(&mnt_ctx->dfs_ses_list, &tcon->dfs_ses_list);
 255                 queue_delayed_work(dfscache_wq, &tcon->dfs_cache_work,
 256                                    dfs_cache_get_ttl() * HZ);
 257         } else {
 258                 dfs_put_root_smb_sessions(&mnt_ctx->dfs_ses_list);
 259         }
 260
 261 out:
 262         kfree(origin_fullpath);
 263         return rc;
 264 }
 265
 266 /* Resolve UNC hostname in @ctx->source and set ip addr in @ctx->dstaddr */
 267 static int update_fs_context_dstaddr(struct smb3_fs_context *ctx)
 268 {
 269         struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
 270         int rc;
 271
 272         rc = dns_resolve_server_name_to_ip(ctx->source, addr, NULL);
 273         if (!rc)
 274                 cifs_set_port(addr, ctx->port);
 275         return rc;
 276 }
 277
 278 int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs)
 279 {
 280         struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
 281         bool nodfs = ctx->nodfs;
 282         int rc;
 283
 284         rc = update_fs_context_dstaddr(ctx);
 285         if (rc)
 286                 return rc;
 287
 288         *isdfs = false;
 289         rc = get_session(mnt_ctx, NULL);
 290         if (rc)
 291                 return rc;
 292
 293         ctx->dfs_root_ses = mnt_ctx->ses;
 294         /*
 295          * If called with 'nodfs' mount option, then skip DFS resolving.  Otherwise unconditionally
 296          * try to get an DFS referral (even cached) to determine whether it is an DFS mount.
 297          *
 298          * Skip prefix path to provide support for DFS referrals from w2k8 servers which don't seem
 299          * to respond with PATH_NOT_COVERED to requests that include the prefix.
 300          */
 301         if (!nodfs) {
 302                 rc = dfs_get_referral(mnt_ctx, ctx->UNC + 1, NULL, NULL);
 303                 if (rc) {
 304                         cifs_dbg(FYI, "%s: no dfs referral for %s: %d\n",
 305                                  __func__, ctx->UNC + 1, rc);
 306                         cifs_dbg(FYI, "%s: assuming non-dfs mount...\n", __func__);
 307                         nodfs = true;
 308                 }
 309         }
 310         if (nodfs) {
 311                 rc = cifs_mount_get_tcon(mnt_ctx);
 312                 if (!rc)
 313                         rc = cifs_is_path_remote(mnt_ctx);
 314                 return rc;
 315         }
 316
 317         *isdfs = true;
 318         add_root_smb_session(mnt_ctx);
 319         return __dfs_mount_share(mnt_ctx);
 320 }
 321
 322 /* Update dfs referral path of superblock */
 323 static int update_server_fullpath(struct TCP_Server_Info *server, struct cifs_sb_info *cifs_sb,
 324                                   const char *target)
 325 {
 326         int rc = 0;
 327         size_t len = strlen(target);
 328         char *refpath, *npath;
 329
 330         if (unlikely(len < 2 || *target != '\\'))
 331                 return -EINVAL;
 332
 333         if (target[1] == '\\') {
 334                 len += 1;
 335                 refpath = kmalloc(len, GFP_KERNEL);
 336                 if (!refpath)
 337                         return -ENOMEM;
 338
 339                 scnprintf(refpath, len, "%s", target);
 340         } else {
 341                 len += sizeof("\\");
 342                 refpath = kmalloc(len, GFP_KERNEL);
 343                 if (!refpath)
 344                         return -ENOMEM;
 345
 346                 scnprintf(refpath, len, "\\%s", target);
 347         }
 348
 349         npath = dfs_cache_canonical_path(refpath, cifs_sb->local_nls, cifs_remap(cifs_sb));
 350         kfree(refpath);
 351
 352         if (IS_ERR(npath)) {
 353                 rc = PTR_ERR(npath);
 354         } else {
 355                 mutex_lock(&server->refpath_lock);
 356                 spin_lock(&server->srv_lock);
 357                 kfree(server->leaf_fullpath);
 358                 server->leaf_fullpath = npath;
 359                 spin_unlock(&server->srv_lock);
 360                 mutex_unlock(&server->refpath_lock);
 361         }
 362         return rc;
 363 }
 364
 365 static int target_share_matches_server(struct TCP_Server_Info *server, char *share,
 366                                        bool *target_match)
 367 {
 368         int rc = 0;
 369         const char *dfs_host;
 370         size_t dfs_host_len;
 371
 372         *target_match = true;
 373         extract_unc_hostname(share, &dfs_host, &dfs_host_len);
 374
 375         /* Check if hostnames or addresses match */
 376         cifs_server_lock(server);
 377         if (dfs_host_len != strlen(server->hostname) ||
 378             strncasecmp(dfs_host, server->hostname, dfs_host_len)) {
 379                 cifs_dbg(FYI, "%s: %.*s doesn't match %s\n", __func__,
 380                          (int)dfs_host_len, dfs_host, server->hostname);
 381                 rc = match_target_ip(server, dfs_host, dfs_host_len, target_match);
 382                 if (rc)
 383                         cifs_dbg(VFS, "%s: failed to match target ip: %d\n", __func__, rc);
 384         }
 385         cifs_server_unlock(server);
 386         return rc;
 387 }
 388
 389 static void __tree_connect_ipc(const unsigned int xid, char *tree,
 390                                struct cifs_sb_info *cifs_sb,
 391                                struct cifs_ses *ses)
 392 {
 393         struct TCP_Server_Info *server = ses->server;
 394         struct cifs_tcon *tcon = ses->tcon_ipc;
 395         int rc;
 396
 397         spin_lock(&ses->ses_lock);
 398         spin_lock(&ses->chan_lock);
 399         if (cifs_chan_needs_reconnect(ses, server) ||
 400             ses->ses_status != SES_GOOD) {
 401                 spin_unlock(&ses->chan_lock);
 402                 spin_unlock(&ses->ses_lock);
 403                 cifs_server_dbg(FYI, "%s: skipping ipc reconnect due to disconnected ses\n",
 404                                 __func__);
 405                 return;
 406         }
 407         spin_unlock(&ses->chan_lock);
 408         spin_unlock(&ses->ses_lock);
 409
 410         cifs_server_lock(server);
 411         scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
 412         cifs_server_unlock(server);
 413
 414         rc = server->ops->tree_connect(xid, ses, tree, tcon,
 415                                        cifs_sb->local_nls);
 416         cifs_server_dbg(FYI, "%s: tree_reconnect %s: %d\n", __func__, tree, rc);
 417         spin_lock(&tcon->tc_lock);
 418         if (rc) {
 419                 tcon->status = TID_NEED_TCON;
 420         } else {
 421                 tcon->status = TID_GOOD;
 422                 tcon->need_reconnect = false;
 423         }
 424         spin_unlock(&tcon->tc_lock);
 425 }
 426
 427 static void tree_connect_ipc(const unsigned int xid, char *tree,
 428                              struct cifs_sb_info *cifs_sb,
 429                              struct cifs_tcon *tcon)
 430 {
 431         struct cifs_ses *ses = tcon->ses;
 432
 433         __tree_connect_ipc(xid, tree, cifs_sb, ses);
 434         __tree_connect_ipc(xid, tree, cifs_sb, CIFS_DFS_ROOT_SES(ses));
 435 }
 436
 437 static int __tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
 438                                      struct cifs_sb_info *cifs_sb, char *tree, bool islink,
 439                                      struct dfs_cache_tgt_list *tl)
 440 {
 441         int rc;
 442         struct TCP_Server_Info *server = tcon->ses->server;
 443         const struct smb_version_operations *ops = server->ops;
 444         struct cifs_ses *root_ses = CIFS_DFS_ROOT_SES(tcon->ses);
 445         char *share = NULL, *prefix = NULL;
 446         struct dfs_cache_tgt_iterator *tit;
 447         bool target_match;
 448
 449         tit = dfs_cache_get_tgt_iterator(tl);
 450         if (!tit) {
 451                 rc = -ENOENT;
 452                 goto out;
 453         }
 454
 455         /* Try to tree connect to all dfs targets */
 456         for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
 457                 const char *target = dfs_cache_get_tgt_name(tit);
 458                 DFS_CACHE_TGT_LIST(ntl);
 459
 460                 kfree(share);
 461                 kfree(prefix);
 462                 share = prefix = NULL;
 463
 464                 /* Check if share matches with tcp ses */
 465                 rc = dfs_cache_get_tgt_share(server->leaf_fullpath + 1, tit, &share, &prefix);
 466                 if (rc) {
 467                         cifs_dbg(VFS, "%s: failed to parse target share: %d\n", __func__, rc);
 468                         break;
 469                 }
 470
 471                 rc = target_share_matches_server(server, share, &target_match);
 472                 if (rc)
 473                         break;
 474                 if (!target_match) {
 475                         rc = -EHOSTUNREACH;
 476                         continue;
 477                 }
 478
 479                 dfs_cache_noreq_update_tgthint(server->leaf_fullpath + 1, tit);
 480                 tree_connect_ipc(xid, tree, cifs_sb, tcon);
 481
 482                 scnprintf(tree, MAX_TREE_SIZE, "\\%s", share);
 483                 if (!islink) {
 484                         rc = ops->tree_connect(xid, tcon->ses, tree, tcon, cifs_sb->local_nls);
 485                         break;
 486                 }
 487
 488                 /*
 489                  * If no dfs referrals were returned from link target, then just do a TREE_CONNECT
 490                  * to it.  Otherwise, cache the dfs referral and then mark current tcp ses for
 491                  * reconnect so either the demultiplex thread or the echo worker will reconnect to
 492                  * newly resolved target.
 493                  */
 494                 if (dfs_cache_find(xid, root_ses, cifs_sb->local_nls, cifs_remap(cifs_sb), target,
 495                                    NULL, &ntl)) {
 496                         rc = ops->tree_connect(xid, tcon->ses, tree, tcon, cifs_sb->local_nls);
 497                         if (rc)
 498                                 continue;
 499
 500                         rc = cifs_update_super_prepath(cifs_sb, prefix);
 501                 } else {
 502                         /* Target is another dfs share */
 503                         rc = update_server_fullpath(server, cifs_sb, target);
 504                         dfs_cache_free_tgts(tl);
 505
 506                         if (!rc) {
 507                                 rc = -EREMOTE;
 508                                 list_replace_init(&ntl.tl_list, &tl->tl_list);
 509                         } else
 510                                 dfs_cache_free_tgts(&ntl);
 511                 }
 512                 break;
 513         }
 514
 515 out:
 516         kfree(share);
 517         kfree(prefix);
 518
 519         return rc;
 520 }
 521
 522 static int tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
 523                                    struct cifs_sb_info *cifs_sb, char *tree, bool islink,
 524                                    struct dfs_cache_tgt_list *tl)
 525 {
 526         int rc;
 527         int num_links = 0;
 528         struct TCP_Server_Info *server = tcon->ses->server;
 529         char *old_fullpath = server->leaf_fullpath;
 530
 531         do {
 532                 rc = __tree_connect_dfs_target(xid, tcon, cifs_sb, tree, islink, tl);
 533                 if (!rc || rc != -EREMOTE)
 534                         break;
 535         } while (rc = -ELOOP, ++num_links < MAX_NESTED_LINKS);
 536         /*
 537          * If we couldn't tree connect to any targets from last referral path, then
 538          * retry it from newly resolved dfs referral.
 539          */
 540         if (rc && server->leaf_fullpath != old_fullpath)
 541                 cifs_signal_cifsd_for_reconnect(server, true);
 542
 543         dfs_cache_free_tgts(tl);
 544         return rc;
 545 }
 546
 547 int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
 548 {
 549         int rc;
 550         struct TCP_Server_Info *server = tcon->ses->server;
 551         const struct smb_version_operations *ops = server->ops;
 552         DFS_CACHE_TGT_LIST(tl);
 553         struct cifs_sb_info *cifs_sb = NULL;
 554         struct super_block *sb = NULL;
 555         struct dfs_info3_param ref = {0};
 556         char *tree;
 557
 558         /* only send once per connect */
 559         spin_lock(&tcon->tc_lock);
 560         if (tcon->status == TID_GOOD) {
 561                 spin_unlock(&tcon->tc_lock);
 562                 return 0;
 563         }
 564
 565         if (tcon->status != TID_NEW &&
 566             tcon->status != TID_NEED_TCON) {
 567                 spin_unlock(&tcon->tc_lock);
 568                 return -EHOSTDOWN;
 569         }
 570
 571         tcon->status = TID_IN_TCON;
 572         spin_unlock(&tcon->tc_lock);
 573
 574         tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
 575         if (!tree) {
 576                 rc = -ENOMEM;
 577                 goto out;
 578         }
 579
 580         if (tcon->ipc) {
 581                 cifs_server_lock(server);
 582                 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
 583                 cifs_server_unlock(server);
 584                 rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
 585                 goto out;
 586         }
 587
 588         sb = cifs_get_dfs_tcon_super(tcon);
 589         if (!IS_ERR(sb))
 590                 cifs_sb = CIFS_SB(sb);
 591
 592         /*
 593          * Tree connect to last share in @tcon->tree_name whether dfs super or
 594          * cached dfs referral was not found.
 595          */
 596         if (!cifs_sb || !server->leaf_fullpath ||
 597             dfs_cache_noreq_find(server->leaf_fullpath + 1, &ref, &tl)) {
 598                 rc = ops->tree_connect(xid, tcon->ses, tcon->tree_name, tcon,
 599                                        cifs_sb ? cifs_sb->local_nls : nlsc);
 600                 goto out;
 601         }
 602
 603         rc = tree_connect_dfs_target(xid, tcon, cifs_sb, tree, ref.server_type == DFS_TYPE_LINK,
 604                                      &tl);
 605         free_dfs_info_param(&ref);
 606
 607 out:
 608         kfree(tree);
 609         cifs_put_tcp_super(sb);
 610
 611         if (rc) {
 612                 spin_lock(&tcon->tc_lock);
 613                 if (tcon->status == TID_IN_TCON)
 614                         tcon->status = TID_NEED_TCON;
 615                 spin_unlock(&tcon->tc_lock);
 616         } else {
 617                 spin_lock(&tcon->tc_lock);
 618                 if (tcon->status == TID_IN_TCON)
 619                         tcon->status = TID_GOOD;
 620                 spin_unlock(&tcon->tc_lock);
 621                 tcon->need_reconnect = false;
 622         }
 623
 624         return rc;
 625 }