fs/cifs/smb2inode.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002, 2011
   5  *                 Etersoft, 2012
   6  *   Author(s): Pavel Shilovsky (pshilovsky@samba.org),
   7  *              Steve French (sfrench@us.ibm.com)
   8  *
   9  */
  10 #include <linux/fs.h>
  11 #include <linux/stat.h>
  12 #include <linux/slab.h>
  13 #include <linux/pagemap.h>
  14 #include <asm/div64.h>
  15 #include "cifsfs.h"
  16 #include "cifspdu.h"
  17 #include "cifsglob.h"
  18 #include "cifsproto.h"
  19 #include "cifs_debug.h"
  20 #include "cifs_fs_sb.h"
  21 #include "cifs_unicode.h"
  22 #include "fscache.h"
  23 #include "smb2glob.h"
  24 #include "smb2pdu.h"
  25 #include "smb2proto.h"
  26 #include "cached_dir.h"
  27 #include "smb2status.h"
  28
  29 static void
  30 free_set_inf_compound(struct smb_rqst *rqst)
  31 {
  32         if (rqst[1].rq_iov)
  33                 SMB2_set_info_free(&rqst[1]);
  34         if (rqst[2].rq_iov)
  35                 SMB2_close_free(&rqst[2]);
  36 }
  37
  38
  39 struct cop_vars {
  40         struct cifs_open_parms oparms;
  41         struct kvec rsp_iov[3];
  42         struct smb_rqst rqst[3];
  43         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
  44         struct kvec qi_iov[1];
  45         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
  46         struct kvec close_iov[1];
  47         struct smb2_file_rename_info rename_info;
  48         struct smb2_file_link_info link_info;
  49 };
  50
  51 /*
  52  * note: If cfile is passed, the reference to it is dropped here.
  53  * So make sure that you do not reuse cfile after return from this func.
  54  *
  55  * If passing @err_iov and @err_buftype, ensure to make them both large enough (>= 3) to hold all
  56  * error responses.  Caller is also responsible for freeing them up.
  57  */
  58 static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
  59                             struct cifs_sb_info *cifs_sb, const char *full_path,
  60                             __u32 desired_access, __u32 create_disposition, __u32 create_options,
  61                             umode_t mode, void *ptr, int command, struct cifsFileInfo *cfile,
  62                             __u8 **extbuf, size_t *extbuflen,
  63                             struct kvec *err_iov, int *err_buftype)
  64 {
  65         struct cop_vars *vars = NULL;
  66         struct kvec *rsp_iov;
  67         struct smb_rqst *rqst;
  68         int rc;
  69         __le16 *utf16_path = NULL;
  70         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
  71         struct cifs_fid fid;
  72         struct cifs_ses *ses = tcon->ses;
  73         struct TCP_Server_Info *server;
  74         int num_rqst = 0;
  75         int resp_buftype[3];
  76         struct smb2_query_info_rsp *qi_rsp = NULL;
  77         struct cifs_open_info_data *idata;
  78         int flags = 0;
  79         __u8 delete_pending[8] = {1, 0, 0, 0, 0, 0, 0, 0};
  80         unsigned int size[2];
  81         void *data[2];
  82         int len;
  83
  84         vars = kzalloc(sizeof(*vars), GFP_ATOMIC);
  85         if (vars == NULL)
  86                 return -ENOMEM;
  87         rqst = &vars->rqst[0];
  88         rsp_iov = &vars->rsp_iov[0];
  89
  90         server = cifs_pick_channel(ses);
  91
  92         if (smb3_encryption_required(tcon))
  93                 flags |= CIFS_TRANSFORM_REQ;
  94
  95         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
  96
  97         /* We already have a handle so we can skip the open */
  98         if (cfile)
  99                 goto after_open;
 100
 101         /* Open */
 102         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 103         if (!utf16_path) {
 104                 rc = -ENOMEM;
 105                 goto finished;
 106         }
 107
 108         vars->oparms = (struct cifs_open_parms) {
 109                 .tcon = tcon,
 110                 .desired_access = desired_access,
 111                 .disposition = create_disposition,
 112                 .create_options = cifs_create_options(cifs_sb, create_options),
 113                 .fid = &fid,
 114                 .mode = mode,
 115                 .cifs_sb = cifs_sb,
 116         };
 117
 118         rqst[num_rqst].rq_iov = &vars->open_iov[0];
 119         rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;
 120         rc = SMB2_open_init(tcon, server,
 121                             &rqst[num_rqst], &oplock, &vars->oparms,
 122                             utf16_path);
 123         kfree(utf16_path);
 124         if (rc)
 125                 goto finished;
 126
 127         smb2_set_next_command(tcon, &rqst[num_rqst]);
 128  after_open:
 129         num_rqst++;
 130         rc = 0;
 131
 132         /* Operation */
 133         switch (command) {
 134         case SMB2_OP_QUERY_INFO:
 135                 rqst[num_rqst].rq_iov = &vars->qi_iov[0];
 136                 rqst[num_rqst].rq_nvec = 1;
 137
 138                 if (cfile)
 139                         rc = SMB2_query_info_init(tcon, server,
 140                                 &rqst[num_rqst],
 141                                 cfile->fid.persistent_fid,
 142                                 cfile->fid.volatile_fid,
 143                                 FILE_ALL_INFORMATION,
 144                                 SMB2_O_INFO_FILE, 0,
 145                                 sizeof(struct smb2_file_all_info) +
 146                                           PATH_MAX * 2, 0, NULL);
 147                 else {
 148                         rc = SMB2_query_info_init(tcon, server,
 149                                 &rqst[num_rqst],
 150                                 COMPOUND_FID,
 151                                 COMPOUND_FID,
 152                                 FILE_ALL_INFORMATION,
 153                                 SMB2_O_INFO_FILE, 0,
 154                                 sizeof(struct smb2_file_all_info) +
 155                                           PATH_MAX * 2, 0, NULL);
 156                         if (!rc) {
 157                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 158                                 smb2_set_related(&rqst[num_rqst]);
 159                         }
 160                 }
 161
 162                 if (rc)
 163                         goto finished;
 164                 num_rqst++;
 165                 trace_smb3_query_info_compound_enter(xid, ses->Suid, tcon->tid,
 166                                                      full_path);
 167                 break;
 168         case SMB2_OP_POSIX_QUERY_INFO:
 169                 rqst[num_rqst].rq_iov = &vars->qi_iov[0];
 170                 rqst[num_rqst].rq_nvec = 1;
 171
 172                 if (cfile)
 173                         rc = SMB2_query_info_init(tcon, server,
 174                                 &rqst[num_rqst],
 175                                 cfile->fid.persistent_fid,
 176                                 cfile->fid.volatile_fid,
 177                                 SMB_FIND_FILE_POSIX_INFO,
 178                                 SMB2_O_INFO_FILE, 0,
 179                                 /* TBD: fix following to allow for longer SIDs */
 180                                 sizeof(struct smb311_posix_qinfo *) + (PATH_MAX * 2) +
 181                                 (sizeof(struct cifs_sid) * 2), 0, NULL);
 182                 else {
 183                         rc = SMB2_query_info_init(tcon, server,
 184                                 &rqst[num_rqst],
 185                                 COMPOUND_FID,
 186                                 COMPOUND_FID,
 187                                 SMB_FIND_FILE_POSIX_INFO,
 188                                 SMB2_O_INFO_FILE, 0,
 189                                 sizeof(struct smb311_posix_qinfo *) + (PATH_MAX * 2) +
 190                                 (sizeof(struct cifs_sid) * 2), 0, NULL);
 191                         if (!rc) {
 192                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 193                                 smb2_set_related(&rqst[num_rqst]);
 194                         }
 195                 }
 196
 197                 if (rc)
 198                         goto finished;
 199                 num_rqst++;
 200                 trace_smb3_posix_query_info_compound_enter(xid, ses->Suid, tcon->tid, full_path);
 201                 break;
 202         case SMB2_OP_DELETE:
 203                 trace_smb3_delete_enter(xid, ses->Suid, tcon->tid, full_path);
 204                 break;
 205         case SMB2_OP_MKDIR:
 206                 /*
 207                  * Directories are created through parameters in the
 208                  * SMB2_open() call.
 209                  */
 210                 trace_smb3_mkdir_enter(xid, ses->Suid, tcon->tid, full_path);
 211                 break;
 212         case SMB2_OP_RMDIR:
 213                 rqst[num_rqst].rq_iov = &vars->si_iov[0];
 214                 rqst[num_rqst].rq_nvec = 1;
 215
 216                 size[0] = 1; /* sizeof __u8 See MS-FSCC section 2.4.11 */
 217                 data[0] = &delete_pending[0];
 218
 219                 rc = SMB2_set_info_init(tcon, server,
 220                                         &rqst[num_rqst], COMPOUND_FID,
 221                                         COMPOUND_FID, current->tgid,
 222                                         FILE_DISPOSITION_INFORMATION,
 223                                         SMB2_O_INFO_FILE, 0, data, size);
 224                 if (rc)
 225                         goto finished;
 226                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 227                 smb2_set_related(&rqst[num_rqst++]);
 228                 trace_smb3_rmdir_enter(xid, ses->Suid, tcon->tid, full_path);
 229                 break;
 230         case SMB2_OP_SET_EOF:
 231                 rqst[num_rqst].rq_iov = &vars->si_iov[0];
 232                 rqst[num_rqst].rq_nvec = 1;
 233
 234                 size[0] = 8; /* sizeof __le64 */
 235                 data[0] = ptr;
 236
 237                 rc = SMB2_set_info_init(tcon, server,
 238                                         &rqst[num_rqst], COMPOUND_FID,
 239                                         COMPOUND_FID, current->tgid,
 240                                         FILE_END_OF_FILE_INFORMATION,
 241                                         SMB2_O_INFO_FILE, 0, data, size);
 242                 if (rc)
 243                         goto finished;
 244                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 245                 smb2_set_related(&rqst[num_rqst++]);
 246                 trace_smb3_set_eof_enter(xid, ses->Suid, tcon->tid, full_path);
 247                 break;
 248         case SMB2_OP_SET_INFO:
 249                 rqst[num_rqst].rq_iov = &vars->si_iov[0];
 250                 rqst[num_rqst].rq_nvec = 1;
 251
 252
 253                 size[0] = sizeof(FILE_BASIC_INFO);
 254                 data[0] = ptr;
 255
 256                 if (cfile)
 257                         rc = SMB2_set_info_init(tcon, server,
 258                                 &rqst[num_rqst],
 259                                 cfile->fid.persistent_fid,
 260                                 cfile->fid.volatile_fid, current->tgid,
 261                                 FILE_BASIC_INFORMATION,
 262                                 SMB2_O_INFO_FILE, 0, data, size);
 263                 else {
 264                         rc = SMB2_set_info_init(tcon, server,
 265                                 &rqst[num_rqst],
 266                                 COMPOUND_FID,
 267                                 COMPOUND_FID, current->tgid,
 268                                 FILE_BASIC_INFORMATION,
 269                                 SMB2_O_INFO_FILE, 0, data, size);
 270                         if (!rc) {
 271                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 272                                 smb2_set_related(&rqst[num_rqst]);
 273                         }
 274                 }
 275
 276                 if (rc)
 277                         goto finished;
 278                 num_rqst++;
 279                 trace_smb3_set_info_compound_enter(xid, ses->Suid, tcon->tid,
 280                                                    full_path);
 281                 break;
 282         case SMB2_OP_RENAME:
 283                 rqst[num_rqst].rq_iov = &vars->si_iov[0];
 284                 rqst[num_rqst].rq_nvec = 2;
 285
 286                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 287
 288                 vars->rename_info.ReplaceIfExists = 1;
 289                 vars->rename_info.RootDirectory = 0;
 290                 vars->rename_info.FileNameLength = cpu_to_le32(len);
 291
 292                 size[0] = sizeof(struct smb2_file_rename_info);
 293                 data[0] = &vars->rename_info;
 294
 295                 size[1] = len + 2 /* null */;
 296                 data[1] = (__le16 *)ptr;
 297
 298                 if (cfile)
 299                         rc = SMB2_set_info_init(tcon, server,
 300                                                 &rqst[num_rqst],
 301                                                 cfile->fid.persistent_fid,
 302                                                 cfile->fid.volatile_fid,
 303                                         current->tgid, FILE_RENAME_INFORMATION,
 304                                         SMB2_O_INFO_FILE, 0, data, size);
 305                 else {
 306                         rc = SMB2_set_info_init(tcon, server,
 307                                         &rqst[num_rqst],
 308                                         COMPOUND_FID, COMPOUND_FID,
 309                                         current->tgid, FILE_RENAME_INFORMATION,
 310                                         SMB2_O_INFO_FILE, 0, data, size);
 311                         if (!rc) {
 312                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 313                                 smb2_set_related(&rqst[num_rqst]);
 314                         }
 315                 }
 316                 if (rc)
 317                         goto finished;
 318                 num_rqst++;
 319                 trace_smb3_rename_enter(xid, ses->Suid, tcon->tid, full_path);
 320                 break;
 321         case SMB2_OP_HARDLINK:
 322                 rqst[num_rqst].rq_iov = &vars->si_iov[0];
 323                 rqst[num_rqst].rq_nvec = 2;
 324
 325                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 326
 327                 vars->link_info.ReplaceIfExists = 0;
 328                 vars->link_info.RootDirectory = 0;
 329                 vars->link_info.FileNameLength = cpu_to_le32(len);
 330
 331                 size[0] = sizeof(struct smb2_file_link_info);
 332                 data[0] = &vars->link_info;
 333
 334                 size[1] = len + 2 /* null */;
 335                 data[1] = (__le16 *)ptr;
 336
 337                 rc = SMB2_set_info_init(tcon, server,
 338                                         &rqst[num_rqst], COMPOUND_FID,
 339                                         COMPOUND_FID, current->tgid,
 340                                         FILE_LINK_INFORMATION,
 341                                         SMB2_O_INFO_FILE, 0, data, size);
 342                 if (rc)
 343                         goto finished;
 344                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 345                 smb2_set_related(&rqst[num_rqst++]);
 346                 trace_smb3_hardlink_enter(xid, ses->Suid, tcon->tid, full_path);
 347                 break;
 348         default:
 349                 cifs_dbg(VFS, "Invalid command\n");
 350                 rc = -EINVAL;
 351         }
 352         if (rc)
 353                 goto finished;
 354
 355         /* We already have a handle so we can skip the close */
 356         if (cfile)
 357                 goto after_close;
 358         /* Close */
 359         flags |= CIFS_CP_CREATE_CLOSE_OP;
 360         rqst[num_rqst].rq_iov = &vars->close_iov[0];
 361         rqst[num_rqst].rq_nvec = 1;
 362         rc = SMB2_close_init(tcon, server,
 363                              &rqst[num_rqst], COMPOUND_FID,
 364                              COMPOUND_FID, false);
 365         smb2_set_related(&rqst[num_rqst]);
 366         if (rc)
 367                 goto finished;
 368  after_close:
 369         num_rqst++;
 370
 371         if (cfile) {
 372                 rc = compound_send_recv(xid, ses, server,
 373                                         flags, num_rqst - 2,
 374                                         &rqst[1], &resp_buftype[1],
 375                                         &rsp_iov[1]);
 376         } else
 377                 rc = compound_send_recv(xid, ses, server,
 378                                         flags, num_rqst,
 379                                         rqst, resp_buftype,
 380                                         rsp_iov);
 381
 382  finished:
 383         if (cfile)
 384                 cifsFileInfo_put(cfile);
 385
 386         SMB2_open_free(&rqst[0]);
 387         if (rc == -EREMCHG) {
 388                 pr_warn_once("server share %s deleted\n", tcon->tree_name);
 389                 tcon->need_reconnect = true;
 390         }
 391
 392         switch (command) {
 393         case SMB2_OP_QUERY_INFO:
 394                 idata = ptr;
 395                 if (rc == 0 && cfile && cfile->symlink_target) {
 396                         idata->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
 397                         if (!idata->symlink_target)
 398                                 rc = -ENOMEM;
 399                 }
 400                 if (rc == 0) {
 401                         qi_rsp = (struct smb2_query_info_rsp *)
 402                                 rsp_iov[1].iov_base;
 403                         rc = smb2_validate_and_copy_iov(
 404                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 405                                 le32_to_cpu(qi_rsp->OutputBufferLength),
 406                                 &rsp_iov[1], sizeof(idata->fi), (char *)&idata->fi);
 407                 }
 408                 if (rqst[1].rq_iov)
 409                         SMB2_query_info_free(&rqst[1]);
 410                 if (rqst[2].rq_iov)
 411                         SMB2_close_free(&rqst[2]);
 412                 if (rc)
 413                         trace_smb3_query_info_compound_err(xid,  ses->Suid,
 414                                                 tcon->tid, rc);
 415                 else
 416                         trace_smb3_query_info_compound_done(xid, ses->Suid,
 417                                                 tcon->tid);
 418                 break;
 419         case SMB2_OP_POSIX_QUERY_INFO:
 420                 idata = ptr;
 421                 if (rc == 0 && cfile && cfile->symlink_target) {
 422                         idata->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
 423                         if (!idata->symlink_target)
 424                                 rc = -ENOMEM;
 425                 }
 426                 if (rc == 0) {
 427                         qi_rsp = (struct smb2_query_info_rsp *)
 428                                 rsp_iov[1].iov_base;
 429                         rc = smb2_validate_and_copy_iov(
 430                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 431                                 le32_to_cpu(qi_rsp->OutputBufferLength),
 432                                 &rsp_iov[1], sizeof(idata->posix_fi) /* add SIDs */,
 433                                 (char *)&idata->posix_fi);
 434                 }
 435                 if (rc == 0) {
 436                         unsigned int length = le32_to_cpu(qi_rsp->OutputBufferLength);
 437
 438                         if (length > sizeof(idata->posix_fi)) {
 439                                 char *base = (char *)rsp_iov[1].iov_base +
 440                                         le16_to_cpu(qi_rsp->OutputBufferOffset) +
 441                                         sizeof(idata->posix_fi);
 442                                 *extbuflen = length - sizeof(idata->posix_fi);
 443                                 *extbuf = kmemdup(base, *extbuflen, GFP_KERNEL);
 444                                 if (!*extbuf)
 445                                         rc = -ENOMEM;
 446                         } else {
 447                                 rc = -EINVAL;
 448                         }
 449                 }
 450                 if (rqst[1].rq_iov)
 451                         SMB2_query_info_free(&rqst[1]);
 452                 if (rqst[2].rq_iov)
 453                         SMB2_close_free(&rqst[2]);
 454                 if (rc)
 455                         trace_smb3_posix_query_info_compound_err(xid,  ses->Suid, tcon->tid, rc);
 456                 else
 457                         trace_smb3_posix_query_info_compound_done(xid, ses->Suid, tcon->tid);
 458                 break;
 459         case SMB2_OP_DELETE:
 460                 if (rc)
 461                         trace_smb3_delete_err(xid,  ses->Suid, tcon->tid, rc);
 462                 else
 463                         trace_smb3_delete_done(xid, ses->Suid, tcon->tid);
 464                 if (rqst[1].rq_iov)
 465                         SMB2_close_free(&rqst[1]);
 466                 break;
 467         case SMB2_OP_MKDIR:
 468                 if (rc)
 469                         trace_smb3_mkdir_err(xid,  ses->Suid, tcon->tid, rc);
 470                 else
 471                         trace_smb3_mkdir_done(xid, ses->Suid, tcon->tid);
 472                 if (rqst[1].rq_iov)
 473                         SMB2_close_free(&rqst[1]);
 474                 break;
 475         case SMB2_OP_HARDLINK:
 476                 if (rc)
 477                         trace_smb3_hardlink_err(xid,  ses->Suid, tcon->tid, rc);
 478                 else
 479                         trace_smb3_hardlink_done(xid, ses->Suid, tcon->tid);
 480                 free_set_inf_compound(rqst);
 481                 break;
 482         case SMB2_OP_RENAME:
 483                 if (rc)
 484                         trace_smb3_rename_err(xid,  ses->Suid, tcon->tid, rc);
 485                 else
 486                         trace_smb3_rename_done(xid, ses->Suid, tcon->tid);
 487                 free_set_inf_compound(rqst);
 488                 break;
 489         case SMB2_OP_RMDIR:
 490                 if (rc)
 491                         trace_smb3_rmdir_err(xid,  ses->Suid, tcon->tid, rc);
 492                 else
 493                         trace_smb3_rmdir_done(xid, ses->Suid, tcon->tid);
 494                 free_set_inf_compound(rqst);
 495                 break;
 496         case SMB2_OP_SET_EOF:
 497                 if (rc)
 498                         trace_smb3_set_eof_err(xid,  ses->Suid, tcon->tid, rc);
 499                 else
 500                         trace_smb3_set_eof_done(xid, ses->Suid, tcon->tid);
 501                 free_set_inf_compound(rqst);
 502                 break;
 503         case SMB2_OP_SET_INFO:
 504                 if (rc)
 505                         trace_smb3_set_info_compound_err(xid,  ses->Suid,
 506                                                 tcon->tid, rc);
 507                 else
 508                         trace_smb3_set_info_compound_done(xid, ses->Suid,
 509                                                 tcon->tid);
 510                 free_set_inf_compound(rqst);
 511                 break;
 512         }
 513
 514         if (rc && err_iov && err_buftype) {
 515                 memcpy(err_iov, rsp_iov, 3 * sizeof(*err_iov));
 516                 memcpy(err_buftype, resp_buftype, 3 * sizeof(*err_buftype));
 517         } else {
 518                 free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 519                 free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 520                 free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
 521         }
 522         kfree(vars);
 523         return rc;
 524 }
 525
 526 int smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 527                          struct cifs_sb_info *cifs_sb, const char *full_path,
 528                          struct cifs_open_info_data *data, bool *adjust_tz, bool *reparse)
 529 {
 530         __u32 create_options = 0;
 531         struct cifsFileInfo *cfile;
 532         struct cached_fid *cfid = NULL;
 533         struct kvec err_iov[3] = {};
 534         int err_buftype[3] = {};
 535         bool islink;
 536         int rc, rc2;
 537
 538         *adjust_tz = false;
 539         *reparse = false;
 540
 541         if (strcmp(full_path, ""))
 542                 rc = -ENOENT;
 543         else
 544                 rc = open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
 545         /* If it is a root and its handle is cached then use it */
 546         if (!rc) {
 547                 if (cfid->file_all_info_is_valid) {
 548                         memcpy(&data->fi, &cfid->file_all_info, sizeof(data->fi));
 549                 } else {
 550                         rc = SMB2_query_info(xid, tcon, cfid->fid.persistent_fid,
 551                                              cfid->fid.volatile_fid, &data->fi);
 552                 }
 553                 close_cached_dir(cfid);
 554                 return rc;
 555         }
 556
 557         cifs_get_readable_path(tcon, full_path, &cfile);
 558         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, FILE_READ_ATTRIBUTES, FILE_OPEN,
 559                               create_options, ACL_NO_MODE, data, SMB2_OP_QUERY_INFO, cfile,
 560                               NULL, NULL, err_iov, err_buftype);
 561         if (rc) {
 562                 struct smb2_hdr *hdr = err_iov[0].iov_base;
 563
 564                 if (unlikely(!hdr || err_buftype[0] == CIFS_NO_BUFFER))
 565                         goto out;
 566                 if (rc == -EOPNOTSUPP && hdr->Command == SMB2_CREATE &&
 567                     hdr->Status == STATUS_STOPPED_ON_SYMLINK) {
 568                         rc = smb2_parse_symlink_response(cifs_sb, err_iov,
 569                                                          &data->symlink_target);
 570                         if (rc)
 571                                 goto out;
 572
 573                         *reparse = true;
 574                         create_options |= OPEN_REPARSE_POINT;
 575
 576                         /* Failed on a symbolic link - query a reparse point info */
 577                         cifs_get_readable_path(tcon, full_path, &cfile);
 578                         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 579                                               FILE_READ_ATTRIBUTES, FILE_OPEN,
 580                                               create_options, ACL_NO_MODE, data,
 581                                               SMB2_OP_QUERY_INFO, cfile, NULL, NULL,
 582                                               NULL, NULL);
 583                         goto out;
 584                 } else if (rc != -EREMOTE && hdr->Status == STATUS_OBJECT_NAME_INVALID) {
 585                         rc2 = cifs_inval_name_dfs_link_error(xid, tcon, cifs_sb,
 586                                                              full_path, &islink);
 587                         if (rc2) {
 588                                 rc = rc2;
 589                                 goto out;
 590                         }
 591                         if (islink)
 592                                 rc = -EREMOTE;
 593                 }
 594                 if (rc == -EREMOTE && IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) && cifs_sb &&
 595                     (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS))
 596                         rc = -EOPNOTSUPP;
 597         }
 598
 599 out:
 600         free_rsp_buf(err_buftype[0], err_iov[0].iov_base);
 601         free_rsp_buf(err_buftype[1], err_iov[1].iov_base);
 602         free_rsp_buf(err_buftype[2], err_iov[2].iov_base);
 603         return rc;
 604 }
 605
 606
 607 int smb311_posix_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 608                                  struct cifs_sb_info *cifs_sb, const char *full_path,
 609                                  struct cifs_open_info_data *data,
 610                                  struct cifs_sid *owner,
 611                                  struct cifs_sid *group,
 612                                  bool *adjust_tz, bool *reparse)
 613 {
 614         int rc;
 615         __u32 create_options = 0;
 616         struct cifsFileInfo *cfile;
 617         struct kvec err_iov[3] = {};
 618         int err_buftype[3] = {};
 619         __u8 *sidsbuf = NULL;
 620         __u8 *sidsbuf_end = NULL;
 621         size_t sidsbuflen = 0;
 622         size_t owner_len, group_len;
 623
 624         *adjust_tz = false;
 625         *reparse = false;
 626
 627         /*
 628          * BB TODO: Add support for using the cached root handle.
 629          * Create SMB2_query_posix_info worker function to do non-compounded query
 630          * when we already have an open file handle for this. For now this is fast enough
 631          * (always using the compounded version).
 632          */
 633
 634         cifs_get_readable_path(tcon, full_path, &cfile);
 635         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, FILE_READ_ATTRIBUTES, FILE_OPEN,
 636                               create_options, ACL_NO_MODE, data, SMB2_OP_POSIX_QUERY_INFO, cfile,
 637                               &sidsbuf, &sidsbuflen, err_iov, err_buftype);
 638         if (rc == -EOPNOTSUPP) {
 639                 /* BB TODO: When support for special files added to Samba re-verify this path */
 640                 if (err_iov[0].iov_base && err_buftype[0] != CIFS_NO_BUFFER &&
 641                     ((struct smb2_hdr *)err_iov[0].iov_base)->Command == SMB2_CREATE &&
 642                     ((struct smb2_hdr *)err_iov[0].iov_base)->Status == STATUS_STOPPED_ON_SYMLINK) {
 643                         rc = smb2_parse_symlink_response(cifs_sb, err_iov, &data->symlink_target);
 644                         if (rc)
 645                                 goto out;
 646                 }
 647                 *reparse = true;
 648                 create_options |= OPEN_REPARSE_POINT;
 649
 650                 /* Failed on a symbolic link - query a reparse point info */
 651                 cifs_get_readable_path(tcon, full_path, &cfile);
 652                 rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, FILE_READ_ATTRIBUTES,
 653                                       FILE_OPEN, create_options, ACL_NO_MODE, data,
 654                                       SMB2_OP_POSIX_QUERY_INFO, cfile,
 655                                       &sidsbuf, &sidsbuflen, NULL, NULL);
 656         }
 657
 658         if (rc == 0) {
 659                 sidsbuf_end = sidsbuf + sidsbuflen;
 660
 661                 owner_len = posix_info_sid_size(sidsbuf, sidsbuf_end);
 662                 if (owner_len == -1) {
 663                         rc = -EINVAL;
 664                         goto out;
 665                 }
 666                 memcpy(owner, sidsbuf, owner_len);
 667
 668                 group_len = posix_info_sid_size(
 669                         sidsbuf + owner_len, sidsbuf_end);
 670                 if (group_len == -1) {
 671                         rc = -EINVAL;
 672                         goto out;
 673                 }
 674                 memcpy(group, sidsbuf + owner_len, group_len);
 675         }
 676
 677 out:
 678         kfree(sidsbuf);
 679         free_rsp_buf(err_buftype[0], err_iov[0].iov_base);
 680         free_rsp_buf(err_buftype[1], err_iov[1].iov_base);
 681         free_rsp_buf(err_buftype[2], err_iov[2].iov_base);
 682         return rc;
 683 }
 684
 685 int
 686 smb2_mkdir(const unsigned int xid, struct inode *parent_inode, umode_t mode,
 687            struct cifs_tcon *tcon, const char *name,
 688            struct cifs_sb_info *cifs_sb)
 689 {
 690         return smb2_compound_op(xid, tcon, cifs_sb, name,
 691                                 FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 692                                 CREATE_NOT_FILE, mode, NULL, SMB2_OP_MKDIR,
 693                                 NULL, NULL, NULL, NULL, NULL);
 694 }
 695
 696 void
 697 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 698                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 699                    const unsigned int xid)
 700 {
 701         FILE_BASIC_INFO data;
 702         struct cifsInodeInfo *cifs_i;
 703         struct cifsFileInfo *cfile;
 704         u32 dosattrs;
 705         int tmprc;
 706
 707         memset(&data, 0, sizeof(data));
 708         cifs_i = CIFS_I(inode);
 709         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 710         data.Attributes = cpu_to_le32(dosattrs);
 711         cifs_get_writable_path(tcon, name, FIND_WR_ANY, &cfile);
 712         tmprc = smb2_compound_op(xid, tcon, cifs_sb, name,
 713                                  FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 714                                  CREATE_NOT_FILE, ACL_NO_MODE,
 715                                  &data, SMB2_OP_SET_INFO, cfile, NULL, NULL, NULL, NULL);
 716         if (tmprc == 0)
 717                 cifs_i->cifsAttrs = dosattrs;
 718 }
 719
 720 int
 721 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 722            struct cifs_sb_info *cifs_sb)
 723 {
 724         drop_cached_dir_by_name(xid, tcon, name, cifs_sb);
 725         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 726                                 CREATE_NOT_FILE, ACL_NO_MODE,
 727                                 NULL, SMB2_OP_RMDIR, NULL, NULL, NULL, NULL, NULL);
 728 }
 729
 730 int
 731 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 732             struct cifs_sb_info *cifs_sb)
 733 {
 734         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 735                                 CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 736                                 ACL_NO_MODE, NULL, SMB2_OP_DELETE, NULL, NULL, NULL, NULL, NULL);
 737 }
 738
 739 static int
 740 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 741                    const char *from_name, const char *to_name,
 742                    struct cifs_sb_info *cifs_sb, __u32 access, int command,
 743                    struct cifsFileInfo *cfile)
 744 {
 745         __le16 *smb2_to_name = NULL;
 746         int rc;
 747
 748         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 749         if (smb2_to_name == NULL) {
 750                 rc = -ENOMEM;
 751                 goto smb2_rename_path;
 752         }
 753         rc = smb2_compound_op(xid, tcon, cifs_sb, from_name, access,
 754                               FILE_OPEN, 0, ACL_NO_MODE, smb2_to_name,
 755                               command, cfile, NULL, NULL, NULL, NULL);
 756 smb2_rename_path:
 757         kfree(smb2_to_name);
 758         return rc;
 759 }
 760
 761 int
 762 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 763                  const char *from_name, const char *to_name,
 764                  struct cifs_sb_info *cifs_sb)
 765 {
 766         struct cifsFileInfo *cfile;
 767
 768         drop_cached_dir_by_name(xid, tcon, from_name, cifs_sb);
 769         cifs_get_writable_path(tcon, from_name, FIND_WR_WITH_DELETE, &cfile);
 770
 771         return smb2_set_path_attr(xid, tcon, from_name, to_name,
 772                                   cifs_sb, DELETE, SMB2_OP_RENAME, cfile);
 773 }
 774
 775 int
 776 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 777                      const char *from_name, const char *to_name,
 778                      struct cifs_sb_info *cifs_sb)
 779 {
 780         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 781                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK,
 782                                   NULL);
 783 }
 784
 785 int
 786 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 787                    const char *full_path, __u64 size,
 788                    struct cifs_sb_info *cifs_sb, bool set_alloc)
 789 {
 790         __le64 eof = cpu_to_le64(size);
 791         struct cifsFileInfo *cfile;
 792
 793         cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
 794         return smb2_compound_op(xid, tcon, cifs_sb, full_path,
 795                                 FILE_WRITE_DATA, FILE_OPEN, 0, ACL_NO_MODE,
 796                                 &eof, SMB2_OP_SET_EOF, cfile, NULL, NULL, NULL, NULL);
 797 }
 798
 799 int
 800 smb2_set_file_info(struct inode *inode, const char *full_path,
 801                    FILE_BASIC_INFO *buf, const unsigned int xid)
 802 {
 803         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 804         struct tcon_link *tlink;
 805         struct cifs_tcon *tcon;
 806         struct cifsFileInfo *cfile;
 807         int rc;
 808
 809         if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
 810             (buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
 811             (buf->Attributes == 0))
 812                 return 0; /* would be a no op, no sense sending this */
 813
 814         tlink = cifs_sb_tlink(cifs_sb);
 815         if (IS_ERR(tlink))
 816                 return PTR_ERR(tlink);
 817         tcon = tlink_tcon(tlink);
 818
 819         cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
 820         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 821                               FILE_WRITE_ATTRIBUTES, FILE_OPEN,
 822                               0, ACL_NO_MODE, buf, SMB2_OP_SET_INFO, cfile,
 823                               NULL, NULL, NULL, NULL);
 824         cifs_put_tlink(tlink);
 825         return rc;
 826 }