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                 .path = full_path,
 111                 .desired_access = desired_access,
 112                 .disposition = create_disposition,
 113                 .create_options = cifs_create_options(cifs_sb, create_options),
 114                 .fid = &fid,
 115                 .mode = mode,
 116                 .cifs_sb = cifs_sb,
 117         };
 118
 119         rqst[num_rqst].rq_iov = &vars->open_iov[0];
 120         rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;
 121         rc = SMB2_open_init(tcon, server,
 122                             &rqst[num_rqst], &oplock, &vars->oparms,
 123                             utf16_path);
 124         kfree(utf16_path);
 125         if (rc)
 126                 goto finished;
 127
 128         smb2_set_next_command(tcon, &rqst[num_rqst]);
 129  after_open:
 130         num_rqst++;
 131         rc = 0;
 132
 133         /* Operation */
 134         switch (command) {
 135         case SMB2_OP_QUERY_INFO:
 136                 rqst[num_rqst].rq_iov = &vars->qi_iov[0];
 137                 rqst[num_rqst].rq_nvec = 1;
 138
 139                 if (cfile)
 140                         rc = SMB2_query_info_init(tcon, server,
 141                                 &rqst[num_rqst],
 142                                 cfile->fid.persistent_fid,
 143                                 cfile->fid.volatile_fid,
 144                                 FILE_ALL_INFORMATION,
 145                                 SMB2_O_INFO_FILE, 0,
 146                                 sizeof(struct smb2_file_all_info) +
 147                                           PATH_MAX * 2, 0, NULL);
 148                 else {
 149                         rc = SMB2_query_info_init(tcon, server,
 150                                 &rqst[num_rqst],
 151                                 COMPOUND_FID,
 152                                 COMPOUND_FID,
 153                                 FILE_ALL_INFORMATION,
 154                                 SMB2_O_INFO_FILE, 0,
 155                                 sizeof(struct smb2_file_all_info) +
 156                                           PATH_MAX * 2, 0, NULL);
 157                         if (!rc) {
 158                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 159                                 smb2_set_related(&rqst[num_rqst]);
 160                         }
 161                 }
 162
 163                 if (rc)
 164                         goto finished;
 165                 num_rqst++;
 166                 trace_smb3_query_info_compound_enter(xid, ses->Suid, tcon->tid,
 167                                                      full_path);
 168                 break;
 169         case SMB2_OP_POSIX_QUERY_INFO:
 170                 rqst[num_rqst].rq_iov = &vars->qi_iov[0];
 171                 rqst[num_rqst].rq_nvec = 1;
 172
 173                 if (cfile)
 174                         rc = SMB2_query_info_init(tcon, server,
 175                                 &rqst[num_rqst],
 176                                 cfile->fid.persistent_fid,
 177                                 cfile->fid.volatile_fid,
 178                                 SMB_FIND_FILE_POSIX_INFO,
 179                                 SMB2_O_INFO_FILE, 0,
 180                                 /* TBD: fix following to allow for longer SIDs */
 181                                 sizeof(struct smb311_posix_qinfo *) + (PATH_MAX * 2) +
 182                                 (sizeof(struct cifs_sid) * 2), 0, NULL);
 183                 else {
 184                         rc = SMB2_query_info_init(tcon, server,
 185                                 &rqst[num_rqst],
 186                                 COMPOUND_FID,
 187                                 COMPOUND_FID,
 188                                 SMB_FIND_FILE_POSIX_INFO,
 189                                 SMB2_O_INFO_FILE, 0,
 190                                 sizeof(struct smb311_posix_qinfo *) + (PATH_MAX * 2) +
 191                                 (sizeof(struct cifs_sid) * 2), 0, NULL);
 192                         if (!rc) {
 193                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 194                                 smb2_set_related(&rqst[num_rqst]);
 195                         }
 196                 }
 197
 198                 if (rc)
 199                         goto finished;
 200                 num_rqst++;
 201                 trace_smb3_posix_query_info_compound_enter(xid, ses->Suid, tcon->tid, full_path);
 202                 break;
 203         case SMB2_OP_DELETE:
 204                 trace_smb3_delete_enter(xid, ses->Suid, tcon->tid, full_path);
 205                 break;
 206         case SMB2_OP_MKDIR:
 207                 /*
 208                  * Directories are created through parameters in the
 209                  * SMB2_open() call.
 210                  */
 211                 trace_smb3_mkdir_enter(xid, ses->Suid, tcon->tid, full_path);
 212                 break;
 213         case SMB2_OP_RMDIR:
 214                 rqst[num_rqst].rq_iov = &vars->si_iov[0];
 215                 rqst[num_rqst].rq_nvec = 1;
 216
 217                 size[0] = 1; /* sizeof __u8 See MS-FSCC section 2.4.11 */
 218                 data[0] = &delete_pending[0];
 219
 220                 rc = SMB2_set_info_init(tcon, server,
 221                                         &rqst[num_rqst], COMPOUND_FID,
 222                                         COMPOUND_FID, current->tgid,
 223                                         FILE_DISPOSITION_INFORMATION,
 224                                         SMB2_O_INFO_FILE, 0, data, size);
 225                 if (rc)
 226                         goto finished;
 227                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 228                 smb2_set_related(&rqst[num_rqst++]);
 229                 trace_smb3_rmdir_enter(xid, ses->Suid, tcon->tid, full_path);
 230                 break;
 231         case SMB2_OP_SET_EOF:
 232                 rqst[num_rqst].rq_iov = &vars->si_iov[0];
 233                 rqst[num_rqst].rq_nvec = 1;
 234
 235                 size[0] = 8; /* sizeof __le64 */
 236                 data[0] = ptr;
 237
 238                 if (cfile) {
 239                         rc = SMB2_set_info_init(tcon, server,
 240                                                 &rqst[num_rqst],
 241                                                 cfile->fid.persistent_fid,
 242                                                 cfile->fid.volatile_fid,
 243                                                 current->tgid,
 244                                                 FILE_END_OF_FILE_INFORMATION,
 245                                                 SMB2_O_INFO_FILE, 0,
 246                                                 data, size);
 247                 } else {
 248                         rc = SMB2_set_info_init(tcon, server,
 249                                                 &rqst[num_rqst],
 250                                                 COMPOUND_FID,
 251                                                 COMPOUND_FID,
 252                                                 current->tgid,
 253                                                 FILE_END_OF_FILE_INFORMATION,
 254                                                 SMB2_O_INFO_FILE, 0,
 255                                                 data, size);
 256                         if (!rc) {
 257                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 258                                 smb2_set_related(&rqst[num_rqst]);
 259                         }
 260                 }
 261                 if (rc)
 262                         goto finished;
 263                 num_rqst++;
 264                 trace_smb3_set_eof_enter(xid, ses->Suid, tcon->tid, full_path);
 265                 break;
 266         case SMB2_OP_SET_INFO:
 267                 rqst[num_rqst].rq_iov = &vars->si_iov[0];
 268                 rqst[num_rqst].rq_nvec = 1;
 269
 270
 271                 size[0] = sizeof(FILE_BASIC_INFO);
 272                 data[0] = ptr;
 273
 274                 if (cfile)
 275                         rc = SMB2_set_info_init(tcon, server,
 276                                 &rqst[num_rqst],
 277                                 cfile->fid.persistent_fid,
 278                                 cfile->fid.volatile_fid, current->tgid,
 279                                 FILE_BASIC_INFORMATION,
 280                                 SMB2_O_INFO_FILE, 0, data, size);
 281                 else {
 282                         rc = SMB2_set_info_init(tcon, server,
 283                                 &rqst[num_rqst],
 284                                 COMPOUND_FID,
 285                                 COMPOUND_FID, current->tgid,
 286                                 FILE_BASIC_INFORMATION,
 287                                 SMB2_O_INFO_FILE, 0, data, size);
 288                         if (!rc) {
 289                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 290                                 smb2_set_related(&rqst[num_rqst]);
 291                         }
 292                 }
 293
 294                 if (rc)
 295                         goto finished;
 296                 num_rqst++;
 297                 trace_smb3_set_info_compound_enter(xid, ses->Suid, tcon->tid,
 298                                                    full_path);
 299                 break;
 300         case SMB2_OP_RENAME:
 301                 rqst[num_rqst].rq_iov = &vars->si_iov[0];
 302                 rqst[num_rqst].rq_nvec = 2;
 303
 304                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 305
 306                 vars->rename_info.ReplaceIfExists = 1;
 307                 vars->rename_info.RootDirectory = 0;
 308                 vars->rename_info.FileNameLength = cpu_to_le32(len);
 309
 310                 size[0] = sizeof(struct smb2_file_rename_info);
 311                 data[0] = &vars->rename_info;
 312
 313                 size[1] = len + 2 /* null */;
 314                 data[1] = (__le16 *)ptr;
 315
 316                 if (cfile)
 317                         rc = SMB2_set_info_init(tcon, server,
 318                                                 &rqst[num_rqst],
 319                                                 cfile->fid.persistent_fid,
 320                                                 cfile->fid.volatile_fid,
 321                                         current->tgid, FILE_RENAME_INFORMATION,
 322                                         SMB2_O_INFO_FILE, 0, data, size);
 323                 else {
 324                         rc = SMB2_set_info_init(tcon, server,
 325                                         &rqst[num_rqst],
 326                                         COMPOUND_FID, COMPOUND_FID,
 327                                         current->tgid, FILE_RENAME_INFORMATION,
 328                                         SMB2_O_INFO_FILE, 0, data, size);
 329                         if (!rc) {
 330                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 331                                 smb2_set_related(&rqst[num_rqst]);
 332                         }
 333                 }
 334                 if (rc)
 335                         goto finished;
 336                 num_rqst++;
 337                 trace_smb3_rename_enter(xid, ses->Suid, tcon->tid, full_path);
 338                 break;
 339         case SMB2_OP_HARDLINK:
 340                 rqst[num_rqst].rq_iov = &vars->si_iov[0];
 341                 rqst[num_rqst].rq_nvec = 2;
 342
 343                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 344
 345                 vars->link_info.ReplaceIfExists = 0;
 346                 vars->link_info.RootDirectory = 0;
 347                 vars->link_info.FileNameLength = cpu_to_le32(len);
 348
 349                 size[0] = sizeof(struct smb2_file_link_info);
 350                 data[0] = &vars->link_info;
 351
 352                 size[1] = len + 2 /* null */;
 353                 data[1] = (__le16 *)ptr;
 354
 355                 rc = SMB2_set_info_init(tcon, server,
 356                                         &rqst[num_rqst], COMPOUND_FID,
 357                                         COMPOUND_FID, current->tgid,
 358                                         FILE_LINK_INFORMATION,
 359                                         SMB2_O_INFO_FILE, 0, data, size);
 360                 if (rc)
 361                         goto finished;
 362                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 363                 smb2_set_related(&rqst[num_rqst++]);
 364                 trace_smb3_hardlink_enter(xid, ses->Suid, tcon->tid, full_path);
 365                 break;
 366         default:
 367                 cifs_dbg(VFS, "Invalid command\n");
 368                 rc = -EINVAL;
 369         }
 370         if (rc)
 371                 goto finished;
 372
 373         /* We already have a handle so we can skip the close */
 374         if (cfile)
 375                 goto after_close;
 376         /* Close */
 377         flags |= CIFS_CP_CREATE_CLOSE_OP;
 378         rqst[num_rqst].rq_iov = &vars->close_iov[0];
 379         rqst[num_rqst].rq_nvec = 1;
 380         rc = SMB2_close_init(tcon, server,
 381                              &rqst[num_rqst], COMPOUND_FID,
 382                              COMPOUND_FID, false);
 383         smb2_set_related(&rqst[num_rqst]);
 384         if (rc)
 385                 goto finished;
 386  after_close:
 387         num_rqst++;
 388
 389         if (cfile) {
 390                 rc = compound_send_recv(xid, ses, server,
 391                                         flags, num_rqst - 2,
 392                                         &rqst[1], &resp_buftype[1],
 393                                         &rsp_iov[1]);
 394         } else
 395                 rc = compound_send_recv(xid, ses, server,
 396                                         flags, num_rqst,
 397                                         rqst, resp_buftype,
 398                                         rsp_iov);
 399
 400  finished:
 401         if (cfile)
 402                 cifsFileInfo_put(cfile);
 403
 404         SMB2_open_free(&rqst[0]);
 405         if (rc == -EREMCHG) {
 406                 pr_warn_once("server share %s deleted\n", tcon->tree_name);
 407                 tcon->need_reconnect = true;
 408         }
 409
 410         switch (command) {
 411         case SMB2_OP_QUERY_INFO:
 412                 idata = ptr;
 413                 if (rc == 0 && cfile && cfile->symlink_target) {
 414                         idata->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
 415                         if (!idata->symlink_target)
 416                                 rc = -ENOMEM;
 417                 }
 418                 if (rc == 0) {
 419                         qi_rsp = (struct smb2_query_info_rsp *)
 420                                 rsp_iov[1].iov_base;
 421                         rc = smb2_validate_and_copy_iov(
 422                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 423                                 le32_to_cpu(qi_rsp->OutputBufferLength),
 424                                 &rsp_iov[1], sizeof(idata->fi), (char *)&idata->fi);
 425                 }
 426                 if (rqst[1].rq_iov)
 427                         SMB2_query_info_free(&rqst[1]);
 428                 if (rqst[2].rq_iov)
 429                         SMB2_close_free(&rqst[2]);
 430                 if (rc)
 431                         trace_smb3_query_info_compound_err(xid,  ses->Suid,
 432                                                 tcon->tid, rc);
 433                 else
 434                         trace_smb3_query_info_compound_done(xid, ses->Suid,
 435                                                 tcon->tid);
 436                 break;
 437         case SMB2_OP_POSIX_QUERY_INFO:
 438                 idata = ptr;
 439                 if (rc == 0 && cfile && cfile->symlink_target) {
 440                         idata->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
 441                         if (!idata->symlink_target)
 442                                 rc = -ENOMEM;
 443                 }
 444                 if (rc == 0) {
 445                         qi_rsp = (struct smb2_query_info_rsp *)
 446                                 rsp_iov[1].iov_base;
 447                         rc = smb2_validate_and_copy_iov(
 448                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 449                                 le32_to_cpu(qi_rsp->OutputBufferLength),
 450                                 &rsp_iov[1], sizeof(idata->posix_fi) /* add SIDs */,
 451                                 (char *)&idata->posix_fi);
 452                 }
 453                 if (rc == 0) {
 454                         unsigned int length = le32_to_cpu(qi_rsp->OutputBufferLength);
 455
 456                         if (length > sizeof(idata->posix_fi)) {
 457                                 char *base = (char *)rsp_iov[1].iov_base +
 458                                         le16_to_cpu(qi_rsp->OutputBufferOffset) +
 459                                         sizeof(idata->posix_fi);
 460                                 *extbuflen = length - sizeof(idata->posix_fi);
 461                                 *extbuf = kmemdup(base, *extbuflen, GFP_KERNEL);
 462                                 if (!*extbuf)
 463                                         rc = -ENOMEM;
 464                         } else {
 465                                 rc = -EINVAL;
 466                         }
 467                 }
 468                 if (rqst[1].rq_iov)
 469                         SMB2_query_info_free(&rqst[1]);
 470                 if (rqst[2].rq_iov)
 471                         SMB2_close_free(&rqst[2]);
 472                 if (rc)
 473                         trace_smb3_posix_query_info_compound_err(xid,  ses->Suid, tcon->tid, rc);
 474                 else
 475                         trace_smb3_posix_query_info_compound_done(xid, ses->Suid, tcon->tid);
 476                 break;
 477         case SMB2_OP_DELETE:
 478                 if (rc)
 479                         trace_smb3_delete_err(xid,  ses->Suid, tcon->tid, rc);
 480                 else
 481                         trace_smb3_delete_done(xid, ses->Suid, tcon->tid);
 482                 if (rqst[1].rq_iov)
 483                         SMB2_close_free(&rqst[1]);
 484                 break;
 485         case SMB2_OP_MKDIR:
 486                 if (rc)
 487                         trace_smb3_mkdir_err(xid,  ses->Suid, tcon->tid, rc);
 488                 else
 489                         trace_smb3_mkdir_done(xid, ses->Suid, tcon->tid);
 490                 if (rqst[1].rq_iov)
 491                         SMB2_close_free(&rqst[1]);
 492                 break;
 493         case SMB2_OP_HARDLINK:
 494                 if (rc)
 495                         trace_smb3_hardlink_err(xid,  ses->Suid, tcon->tid, rc);
 496                 else
 497                         trace_smb3_hardlink_done(xid, ses->Suid, tcon->tid);
 498                 free_set_inf_compound(rqst);
 499                 break;
 500         case SMB2_OP_RENAME:
 501                 if (rc)
 502                         trace_smb3_rename_err(xid,  ses->Suid, tcon->tid, rc);
 503                 else
 504                         trace_smb3_rename_done(xid, ses->Suid, tcon->tid);
 505                 free_set_inf_compound(rqst);
 506                 break;
 507         case SMB2_OP_RMDIR:
 508                 if (rc)
 509                         trace_smb3_rmdir_err(xid,  ses->Suid, tcon->tid, rc);
 510                 else
 511                         trace_smb3_rmdir_done(xid, ses->Suid, tcon->tid);
 512                 free_set_inf_compound(rqst);
 513                 break;
 514         case SMB2_OP_SET_EOF:
 515                 if (rc)
 516                         trace_smb3_set_eof_err(xid,  ses->Suid, tcon->tid, rc);
 517                 else
 518                         trace_smb3_set_eof_done(xid, ses->Suid, tcon->tid);
 519                 free_set_inf_compound(rqst);
 520                 break;
 521         case SMB2_OP_SET_INFO:
 522                 if (rc)
 523                         trace_smb3_set_info_compound_err(xid,  ses->Suid,
 524                                                 tcon->tid, rc);
 525                 else
 526                         trace_smb3_set_info_compound_done(xid, ses->Suid,
 527                                                 tcon->tid);
 528                 free_set_inf_compound(rqst);
 529                 break;
 530         }
 531
 532         if (rc && err_iov && err_buftype) {
 533                 memcpy(err_iov, rsp_iov, 3 * sizeof(*err_iov));
 534                 memcpy(err_buftype, resp_buftype, 3 * sizeof(*err_buftype));
 535         } else {
 536                 free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 537                 free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 538                 free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
 539         }
 540         kfree(vars);
 541         return rc;
 542 }
 543
 544 int smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 545                          struct cifs_sb_info *cifs_sb, const char *full_path,
 546                          struct cifs_open_info_data *data, bool *adjust_tz, bool *reparse)
 547 {
 548         __u32 create_options = 0;
 549         struct cifsFileInfo *cfile;
 550         struct cached_fid *cfid = NULL;
 551         struct kvec err_iov[3] = {};
 552         int err_buftype[3] = {};
 553         bool islink;
 554         int rc, rc2;
 555
 556         *adjust_tz = false;
 557         *reparse = false;
 558
 559         if (strcmp(full_path, ""))
 560                 rc = -ENOENT;
 561         else
 562                 rc = open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
 563         /* If it is a root and its handle is cached then use it */
 564         if (!rc) {
 565                 if (cfid->file_all_info_is_valid) {
 566                         memcpy(&data->fi, &cfid->file_all_info, sizeof(data->fi));
 567                 } else {
 568                         rc = SMB2_query_info(xid, tcon, cfid->fid.persistent_fid,
 569                                              cfid->fid.volatile_fid, &data->fi);
 570                 }
 571                 close_cached_dir(cfid);
 572                 return rc;
 573         }
 574
 575         cifs_get_readable_path(tcon, full_path, &cfile);
 576         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, FILE_READ_ATTRIBUTES, FILE_OPEN,
 577                               create_options, ACL_NO_MODE, data, SMB2_OP_QUERY_INFO, cfile,
 578                               NULL, NULL, err_iov, err_buftype);
 579         if (rc) {
 580                 struct smb2_hdr *hdr = err_iov[0].iov_base;
 581
 582                 if (unlikely(!hdr || err_buftype[0] == CIFS_NO_BUFFER))
 583                         goto out;
 584                 if (rc == -EOPNOTSUPP && hdr->Command == SMB2_CREATE &&
 585                     hdr->Status == STATUS_STOPPED_ON_SYMLINK) {
 586                         rc = smb2_parse_symlink_response(cifs_sb, err_iov,
 587                                                          &data->symlink_target);
 588                         if (rc)
 589                                 goto out;
 590
 591                         *reparse = true;
 592                         create_options |= OPEN_REPARSE_POINT;
 593
 594                         /* Failed on a symbolic link - query a reparse point info */
 595                         cifs_get_readable_path(tcon, full_path, &cfile);
 596                         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 597                                               FILE_READ_ATTRIBUTES, FILE_OPEN,
 598                                               create_options, ACL_NO_MODE, data,
 599                                               SMB2_OP_QUERY_INFO, cfile, NULL, NULL,
 600                                               NULL, NULL);
 601                         goto out;
 602                 } else if (rc != -EREMOTE && hdr->Status == STATUS_OBJECT_NAME_INVALID) {
 603                         rc2 = cifs_inval_name_dfs_link_error(xid, tcon, cifs_sb,
 604                                                              full_path, &islink);
 605                         if (rc2) {
 606                                 rc = rc2;
 607                                 goto out;
 608                         }
 609                         if (islink)
 610                                 rc = -EREMOTE;
 611                 }
 612                 if (rc == -EREMOTE && IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) && cifs_sb &&
 613                     (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS))
 614                         rc = -EOPNOTSUPP;
 615         }
 616
 617 out:
 618         free_rsp_buf(err_buftype[0], err_iov[0].iov_base);
 619         free_rsp_buf(err_buftype[1], err_iov[1].iov_base);
 620         free_rsp_buf(err_buftype[2], err_iov[2].iov_base);
 621         return rc;
 622 }
 623
 624
 625 int smb311_posix_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 626                                  struct cifs_sb_info *cifs_sb, const char *full_path,
 627                                  struct cifs_open_info_data *data,
 628                                  struct cifs_sid *owner,
 629                                  struct cifs_sid *group,
 630                                  bool *adjust_tz, bool *reparse)
 631 {
 632         int rc;
 633         __u32 create_options = 0;
 634         struct cifsFileInfo *cfile;
 635         struct kvec err_iov[3] = {};
 636         int err_buftype[3] = {};
 637         __u8 *sidsbuf = NULL;
 638         __u8 *sidsbuf_end = NULL;
 639         size_t sidsbuflen = 0;
 640         size_t owner_len, group_len;
 641
 642         *adjust_tz = false;
 643         *reparse = false;
 644
 645         /*
 646          * BB TODO: Add support for using the cached root handle.
 647          * Create SMB2_query_posix_info worker function to do non-compounded query
 648          * when we already have an open file handle for this. For now this is fast enough
 649          * (always using the compounded version).
 650          */
 651
 652         cifs_get_readable_path(tcon, full_path, &cfile);
 653         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, FILE_READ_ATTRIBUTES, FILE_OPEN,
 654                               create_options, ACL_NO_MODE, data, SMB2_OP_POSIX_QUERY_INFO, cfile,
 655                               &sidsbuf, &sidsbuflen, err_iov, err_buftype);
 656         if (rc == -EOPNOTSUPP) {
 657                 /* BB TODO: When support for special files added to Samba re-verify this path */
 658                 if (err_iov[0].iov_base && err_buftype[0] != CIFS_NO_BUFFER &&
 659                     ((struct smb2_hdr *)err_iov[0].iov_base)->Command == SMB2_CREATE &&
 660                     ((struct smb2_hdr *)err_iov[0].iov_base)->Status == STATUS_STOPPED_ON_SYMLINK) {
 661                         rc = smb2_parse_symlink_response(cifs_sb, err_iov, &data->symlink_target);
 662                         if (rc)
 663                                 goto out;
 664                 }
 665                 *reparse = true;
 666                 create_options |= OPEN_REPARSE_POINT;
 667
 668                 /* Failed on a symbolic link - query a reparse point info */
 669                 cifs_get_readable_path(tcon, full_path, &cfile);
 670                 rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, FILE_READ_ATTRIBUTES,
 671                                       FILE_OPEN, create_options, ACL_NO_MODE, data,
 672                                       SMB2_OP_POSIX_QUERY_INFO, cfile,
 673                                       &sidsbuf, &sidsbuflen, NULL, NULL);
 674         }
 675
 676         if (rc == 0) {
 677                 sidsbuf_end = sidsbuf + sidsbuflen;
 678
 679                 owner_len = posix_info_sid_size(sidsbuf, sidsbuf_end);
 680                 if (owner_len == -1) {
 681                         rc = -EINVAL;
 682                         goto out;
 683                 }
 684                 memcpy(owner, sidsbuf, owner_len);
 685
 686                 group_len = posix_info_sid_size(
 687                         sidsbuf + owner_len, sidsbuf_end);
 688                 if (group_len == -1) {
 689                         rc = -EINVAL;
 690                         goto out;
 691                 }
 692                 memcpy(group, sidsbuf + owner_len, group_len);
 693         }
 694
 695 out:
 696         kfree(sidsbuf);
 697         free_rsp_buf(err_buftype[0], err_iov[0].iov_base);
 698         free_rsp_buf(err_buftype[1], err_iov[1].iov_base);
 699         free_rsp_buf(err_buftype[2], err_iov[2].iov_base);
 700         return rc;
 701 }
 702
 703 int
 704 smb2_mkdir(const unsigned int xid, struct inode *parent_inode, umode_t mode,
 705            struct cifs_tcon *tcon, const char *name,
 706            struct cifs_sb_info *cifs_sb)
 707 {
 708         return smb2_compound_op(xid, tcon, cifs_sb, name,
 709                                 FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 710                                 CREATE_NOT_FILE, mode, NULL, SMB2_OP_MKDIR,
 711                                 NULL, NULL, NULL, NULL, NULL);
 712 }
 713
 714 void
 715 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 716                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 717                    const unsigned int xid)
 718 {
 719         FILE_BASIC_INFO data;
 720         struct cifsInodeInfo *cifs_i;
 721         struct cifsFileInfo *cfile;
 722         u32 dosattrs;
 723         int tmprc;
 724
 725         memset(&data, 0, sizeof(data));
 726         cifs_i = CIFS_I(inode);
 727         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 728         data.Attributes = cpu_to_le32(dosattrs);
 729         cifs_get_writable_path(tcon, name, FIND_WR_ANY, &cfile);
 730         tmprc = smb2_compound_op(xid, tcon, cifs_sb, name,
 731                                  FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 732                                  CREATE_NOT_FILE, ACL_NO_MODE,
 733                                  &data, SMB2_OP_SET_INFO, cfile, NULL, NULL, NULL, NULL);
 734         if (tmprc == 0)
 735                 cifs_i->cifsAttrs = dosattrs;
 736 }
 737
 738 int
 739 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 740            struct cifs_sb_info *cifs_sb)
 741 {
 742         drop_cached_dir_by_name(xid, tcon, name, cifs_sb);
 743         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 744                                 CREATE_NOT_FILE, ACL_NO_MODE,
 745                                 NULL, SMB2_OP_RMDIR, NULL, NULL, NULL, NULL, NULL);
 746 }
 747
 748 int
 749 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 750             struct cifs_sb_info *cifs_sb)
 751 {
 752         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 753                                 CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 754                                 ACL_NO_MODE, NULL, SMB2_OP_DELETE, NULL, NULL, NULL, NULL, NULL);
 755 }
 756
 757 static int
 758 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 759                    const char *from_name, const char *to_name,
 760                    struct cifs_sb_info *cifs_sb, __u32 access, int command,
 761                    struct cifsFileInfo *cfile)
 762 {
 763         __le16 *smb2_to_name = NULL;
 764         int rc;
 765
 766         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 767         if (smb2_to_name == NULL) {
 768                 rc = -ENOMEM;
 769                 goto smb2_rename_path;
 770         }
 771         rc = smb2_compound_op(xid, tcon, cifs_sb, from_name, access,
 772                               FILE_OPEN, 0, ACL_NO_MODE, smb2_to_name,
 773                               command, cfile, NULL, NULL, NULL, NULL);
 774 smb2_rename_path:
 775         kfree(smb2_to_name);
 776         return rc;
 777 }
 778
 779 int
 780 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 781                  const char *from_name, const char *to_name,
 782                  struct cifs_sb_info *cifs_sb)
 783 {
 784         struct cifsFileInfo *cfile;
 785
 786         drop_cached_dir_by_name(xid, tcon, from_name, cifs_sb);
 787         cifs_get_writable_path(tcon, from_name, FIND_WR_WITH_DELETE, &cfile);
 788
 789         return smb2_set_path_attr(xid, tcon, from_name, to_name,
 790                                   cifs_sb, DELETE, SMB2_OP_RENAME, cfile);
 791 }
 792
 793 int
 794 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 795                      const char *from_name, const char *to_name,
 796                      struct cifs_sb_info *cifs_sb)
 797 {
 798         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 799                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK,
 800                                   NULL);
 801 }
 802
 803 int
 804 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 805                    const char *full_path, __u64 size,
 806                    struct cifs_sb_info *cifs_sb, bool set_alloc)
 807 {
 808         __le64 eof = cpu_to_le64(size);
 809         struct cifsFileInfo *cfile;
 810
 811         cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
 812         return smb2_compound_op(xid, tcon, cifs_sb, full_path,
 813                                 FILE_WRITE_DATA, FILE_OPEN, 0, ACL_NO_MODE,
 814                                 &eof, SMB2_OP_SET_EOF, cfile, NULL, NULL, NULL, NULL);
 815 }
 816
 817 int
 818 smb2_set_file_info(struct inode *inode, const char *full_path,
 819                    FILE_BASIC_INFO *buf, const unsigned int xid)
 820 {
 821         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 822         struct tcon_link *tlink;
 823         struct cifs_tcon *tcon;
 824         struct cifsFileInfo *cfile;
 825         int rc;
 826
 827         if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
 828             (buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
 829             (buf->Attributes == 0))
 830                 return 0; /* would be a no op, no sense sending this */
 831
 832         tlink = cifs_sb_tlink(cifs_sb);
 833         if (IS_ERR(tlink))
 834                 return PTR_ERR(tlink);
 835         tcon = tlink_tcon(tlink);
 836
 837         cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
 838         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 839                               FILE_WRITE_ATTRIBUTES, FILE_OPEN,
 840                               0, ACL_NO_MODE, buf, SMB2_OP_SET_INFO, cfile,
 841                               NULL, NULL, NULL, NULL);
 842         cifs_put_tlink(tlink);
 843         return rc;
 844 }