fs/cifs/smb2inode.c

   1 /*
   2  *   fs/cifs/smb2inode.c
   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  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/fs.h>
  24 #include <linux/stat.h>
  25 #include <linux/slab.h>
  26 #include <linux/pagemap.h>
  27 #include <asm/div64.h>
  28 #include "cifsfs.h"
  29 #include "cifspdu.h"
  30 #include "cifsglob.h"
  31 #include "cifsproto.h"
  32 #include "cifs_debug.h"
  33 #include "cifs_fs_sb.h"
  34 #include "cifs_unicode.h"
  35 #include "fscache.h"
  36 #include "smb2glob.h"
  37 #include "smb2pdu.h"
  38 #include "smb2proto.h"
  39
  40 static void
  41 free_set_inf_compound(struct smb_rqst *rqst)
  42 {
  43         if (rqst[1].rq_iov)
  44                 SMB2_set_info_free(&rqst[1]);
  45         if (rqst[2].rq_iov)
  46                 SMB2_close_free(&rqst[2]);
  47 }
  48
  49
  50 static int
  51 smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
  52                  struct cifs_sb_info *cifs_sb, const char *full_path,
  53                  __u32 desired_access, __u32 create_disposition,
  54                  __u32 create_options, umode_t mode, void *ptr, int command,
  55                  struct cifsFileInfo *cfile)
  56 {
  57         int rc;
  58         __le16 *utf16_path = NULL;
  59         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
  60         struct cifs_open_parms oparms;
  61         struct cifs_fid fid;
  62         struct cifs_ses *ses = tcon->ses;
  63         int num_rqst = 0;
  64         struct smb_rqst rqst[3];
  65         int resp_buftype[3];
  66         struct kvec rsp_iov[3];
  67         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
  68         struct kvec qi_iov[1];
  69         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
  70         struct kvec close_iov[1];
  71         struct smb2_query_info_rsp *qi_rsp = NULL;
  72         int flags = 0;
  73         __u8 delete_pending[8] = {1, 0, 0, 0, 0, 0, 0, 0};
  74         unsigned int size[2];
  75         void *data[2];
  76         struct smb2_file_rename_info rename_info;
  77         struct smb2_file_link_info link_info;
  78         int len;
  79
  80         if (smb3_encryption_required(tcon))
  81                 flags |= CIFS_TRANSFORM_REQ;
  82
  83         memset(rqst, 0, sizeof(rqst));
  84         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
  85         memset(rsp_iov, 0, sizeof(rsp_iov));
  86
  87         /* We already have a handle so we can skip the open */
  88         if (cfile)
  89                 goto after_open;
  90
  91         /* Open */
  92         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
  93         if (!utf16_path) {
  94                 rc = -ENOMEM;
  95                 goto finished;
  96         }
  97
  98         memset(&oparms, 0, sizeof(struct cifs_open_parms));
  99         oparms.tcon = tcon;
 100         oparms.desired_access = desired_access;
 101         oparms.disposition = create_disposition;
 102         oparms.create_options = cifs_create_options(cifs_sb, create_options);
 103         oparms.fid = &fid;
 104         oparms.reconnect = false;
 105         oparms.mode = mode;
 106
 107         memset(&open_iov, 0, sizeof(open_iov));
 108         rqst[num_rqst].rq_iov = open_iov;
 109         rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;
 110         rc = SMB2_open_init(tcon, &rqst[num_rqst], &oplock, &oparms,
 111                             utf16_path);
 112         kfree(utf16_path);
 113         if (rc)
 114                 goto finished;
 115
 116         smb2_set_next_command(tcon, &rqst[num_rqst]);
 117  after_open:
 118         num_rqst++;
 119         rc = 0;
 120
 121         /* Operation */
 122         switch (command) {
 123         case SMB2_OP_QUERY_INFO:
 124                 memset(&qi_iov, 0, sizeof(qi_iov));
 125                 rqst[num_rqst].rq_iov = qi_iov;
 126                 rqst[num_rqst].rq_nvec = 1;
 127
 128                 if (cfile)
 129                         rc = SMB2_query_info_init(tcon, &rqst[num_rqst],
 130                                 cfile->fid.persistent_fid,
 131                                 cfile->fid.volatile_fid,
 132                                 FILE_ALL_INFORMATION,
 133                                 SMB2_O_INFO_FILE, 0,
 134                                 sizeof(struct smb2_file_all_info) +
 135                                           PATH_MAX * 2, 0, NULL);
 136                 else {
 137                         rc = SMB2_query_info_init(tcon, &rqst[num_rqst],
 138                                 COMPOUND_FID,
 139                                 COMPOUND_FID,
 140                                  FILE_ALL_INFORMATION,
 141                                 SMB2_O_INFO_FILE, 0,
 142                                 sizeof(struct smb2_file_all_info) +
 143                                           PATH_MAX * 2, 0, NULL);
 144                         if (!rc) {
 145                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 146                                 smb2_set_related(&rqst[num_rqst]);
 147                         }
 148                 }
 149
 150                 if (rc)
 151                         goto finished;
 152                 num_rqst++;
 153                 trace_smb3_query_info_compound_enter(xid, ses->Suid, tcon->tid,
 154                                                      full_path);
 155                 break;
 156         case SMB2_OP_DELETE:
 157                 trace_smb3_delete_enter(xid, ses->Suid, tcon->tid, full_path);
 158                 break;
 159         case SMB2_OP_MKDIR:
 160                 /*
 161                  * Directories are created through parameters in the
 162                  * SMB2_open() call.
 163                  */
 164                 trace_smb3_mkdir_enter(xid, ses->Suid, tcon->tid, full_path);
 165                 break;
 166         case SMB2_OP_RMDIR:
 167                 memset(&si_iov, 0, sizeof(si_iov));
 168                 rqst[num_rqst].rq_iov = si_iov;
 169                 rqst[num_rqst].rq_nvec = 1;
 170
 171                 size[0] = 1; /* sizeof __u8 See MS-FSCC section 2.4.11 */
 172                 data[0] = &delete_pending[0];
 173
 174                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 175                                         COMPOUND_FID, current->tgid,
 176                                         FILE_DISPOSITION_INFORMATION,
 177                                         SMB2_O_INFO_FILE, 0, data, size);
 178                 if (rc)
 179                         goto finished;
 180                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 181                 smb2_set_related(&rqst[num_rqst++]);
 182                 trace_smb3_rmdir_enter(xid, ses->Suid, tcon->tid, full_path);
 183                 break;
 184         case SMB2_OP_SET_EOF:
 185                 memset(&si_iov, 0, sizeof(si_iov));
 186                 rqst[num_rqst].rq_iov = si_iov;
 187                 rqst[num_rqst].rq_nvec = 1;
 188
 189                 size[0] = 8; /* sizeof __le64 */
 190                 data[0] = ptr;
 191
 192                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 193                                         COMPOUND_FID, current->tgid,
 194                                         FILE_END_OF_FILE_INFORMATION,
 195                                         SMB2_O_INFO_FILE, 0, data, size);
 196                 if (rc)
 197                         goto finished;
 198                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 199                 smb2_set_related(&rqst[num_rqst++]);
 200                 trace_smb3_set_eof_enter(xid, ses->Suid, tcon->tid, full_path);
 201                 break;
 202         case SMB2_OP_SET_INFO:
 203                 memset(&si_iov, 0, sizeof(si_iov));
 204                 rqst[num_rqst].rq_iov = si_iov;
 205                 rqst[num_rqst].rq_nvec = 1;
 206
 207
 208                 size[0] = sizeof(FILE_BASIC_INFO);
 209                 data[0] = ptr;
 210
 211                 if (cfile)
 212                         rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
 213                                 cfile->fid.persistent_fid,
 214                                 cfile->fid.volatile_fid, current->tgid,
 215                                 FILE_BASIC_INFORMATION,
 216                                 SMB2_O_INFO_FILE, 0, data, size);
 217                 else {
 218                         rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
 219                                 COMPOUND_FID,
 220                                 COMPOUND_FID, current->tgid,
 221                                 FILE_BASIC_INFORMATION,
 222                                 SMB2_O_INFO_FILE, 0, data, size);
 223                         if (!rc) {
 224                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 225                                 smb2_set_related(&rqst[num_rqst]);
 226                         }
 227                 }
 228
 229                 if (rc)
 230                         goto finished;
 231                 num_rqst++;
 232                 trace_smb3_set_info_compound_enter(xid, ses->Suid, tcon->tid,
 233                                                    full_path);
 234                 break;
 235         case SMB2_OP_RENAME:
 236                 memset(&si_iov, 0, sizeof(si_iov));
 237                 rqst[num_rqst].rq_iov = si_iov;
 238                 rqst[num_rqst].rq_nvec = 2;
 239
 240                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 241
 242                 rename_info.ReplaceIfExists = 1;
 243                 rename_info.RootDirectory = 0;
 244                 rename_info.FileNameLength = cpu_to_le32(len);
 245
 246                 size[0] = sizeof(struct smb2_file_rename_info);
 247                 data[0] = &rename_info;
 248
 249                 size[1] = len + 2 /* null */;
 250                 data[1] = (__le16 *)ptr;
 251
 252                 if (cfile)
 253                         rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
 254                                                 cfile->fid.persistent_fid,
 255                                                 cfile->fid.volatile_fid,
 256                                         current->tgid, FILE_RENAME_INFORMATION,
 257                                         SMB2_O_INFO_FILE, 0, data, size);
 258                 else {
 259                         rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
 260                                         COMPOUND_FID, COMPOUND_FID,
 261                                         current->tgid, FILE_RENAME_INFORMATION,
 262                                         SMB2_O_INFO_FILE, 0, data, size);
 263                         if (!rc) {
 264                                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 265                                 smb2_set_related(&rqst[num_rqst]);
 266                         }
 267                 }
 268                 if (rc)
 269                         goto finished;
 270                 num_rqst++;
 271                 trace_smb3_rename_enter(xid, ses->Suid, tcon->tid, full_path);
 272                 break;
 273         case SMB2_OP_HARDLINK:
 274                 memset(&si_iov, 0, sizeof(si_iov));
 275                 rqst[num_rqst].rq_iov = si_iov;
 276                 rqst[num_rqst].rq_nvec = 2;
 277
 278                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 279
 280                 link_info.ReplaceIfExists = 0;
 281                 link_info.RootDirectory = 0;
 282                 link_info.FileNameLength = cpu_to_le32(len);
 283
 284                 size[0] = sizeof(struct smb2_file_link_info);
 285                 data[0] = &link_info;
 286
 287                 size[1] = len + 2 /* null */;
 288                 data[1] = (__le16 *)ptr;
 289
 290                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 291                                         COMPOUND_FID, current->tgid,
 292                                         FILE_LINK_INFORMATION,
 293                                         SMB2_O_INFO_FILE, 0, data, size);
 294                 if (rc)
 295                         goto finished;
 296                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 297                 smb2_set_related(&rqst[num_rqst++]);
 298                 trace_smb3_hardlink_enter(xid, ses->Suid, tcon->tid, full_path);
 299                 break;
 300         default:
 301                 cifs_dbg(VFS, "Invalid command\n");
 302                 rc = -EINVAL;
 303         }
 304         if (rc)
 305                 goto finished;
 306
 307         /* We already have a handle so we can skip the close */
 308         if (cfile)
 309                 goto after_close;
 310         /* Close */
 311         memset(&close_iov, 0, sizeof(close_iov));
 312         rqst[num_rqst].rq_iov = close_iov;
 313         rqst[num_rqst].rq_nvec = 1;
 314         rc = SMB2_close_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 315                              COMPOUND_FID, false);
 316         smb2_set_related(&rqst[num_rqst]);
 317         if (rc)
 318                 goto finished;
 319  after_close:
 320         num_rqst++;
 321
 322         if (cfile) {
 323                 cifsFileInfo_put(cfile);
 324                 cfile = NULL;
 325                 rc = compound_send_recv(xid, ses, flags, num_rqst - 2,
 326                                         &rqst[1], &resp_buftype[1],
 327                                         &rsp_iov[1]);
 328         } else
 329                 rc = compound_send_recv(xid, ses, flags, num_rqst,
 330                                         rqst, resp_buftype,
 331                                         rsp_iov);
 332
 333  finished:
 334         if (cfile)
 335                 cifsFileInfo_put(cfile);
 336
 337         SMB2_open_free(&rqst[0]);
 338         if (rc == -EREMCHG) {
 339                 printk_once(KERN_WARNING "server share %s deleted\n",
 340                             tcon->treeName);
 341                 tcon->need_reconnect = true;
 342         }
 343
 344         switch (command) {
 345         case SMB2_OP_QUERY_INFO:
 346                 if (rc == 0) {
 347                         qi_rsp = (struct smb2_query_info_rsp *)
 348                                 rsp_iov[1].iov_base;
 349                         rc = smb2_validate_and_copy_iov(
 350                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 351                                 le32_to_cpu(qi_rsp->OutputBufferLength),
 352                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
 353                                 ptr);
 354                 }
 355                 if (rqst[1].rq_iov)
 356                         SMB2_query_info_free(&rqst[1]);
 357                 if (rqst[2].rq_iov)
 358                         SMB2_close_free(&rqst[2]);
 359                 if (rc)
 360                         trace_smb3_query_info_compound_err(xid,  ses->Suid,
 361                                                 tcon->tid, rc);
 362                 else
 363                         trace_smb3_query_info_compound_done(xid, ses->Suid,
 364                                                 tcon->tid);
 365                 break;
 366         case SMB2_OP_DELETE:
 367                 if (rc)
 368                         trace_smb3_delete_err(xid,  ses->Suid, tcon->tid, rc);
 369                 else
 370                         trace_smb3_delete_done(xid, ses->Suid, tcon->tid);
 371                 if (rqst[1].rq_iov)
 372                         SMB2_close_free(&rqst[1]);
 373                 break;
 374         case SMB2_OP_MKDIR:
 375                 if (rc)
 376                         trace_smb3_mkdir_err(xid,  ses->Suid, tcon->tid, rc);
 377                 else
 378                         trace_smb3_mkdir_done(xid, ses->Suid, tcon->tid);
 379                 if (rqst[1].rq_iov)
 380                         SMB2_close_free(&rqst[1]);
 381                 break;
 382         case SMB2_OP_HARDLINK:
 383                 if (rc)
 384                         trace_smb3_hardlink_err(xid,  ses->Suid, tcon->tid, rc);
 385                 else
 386                         trace_smb3_hardlink_done(xid, ses->Suid, tcon->tid);
 387                 free_set_inf_compound(rqst);
 388                 break;
 389         case SMB2_OP_RENAME:
 390                 if (rc)
 391                         trace_smb3_rename_err(xid,  ses->Suid, tcon->tid, rc);
 392                 else
 393                         trace_smb3_rename_done(xid, ses->Suid, tcon->tid);
 394                 free_set_inf_compound(rqst);
 395                 break;
 396         case SMB2_OP_RMDIR:
 397                 if (rc)
 398                         trace_smb3_rmdir_err(xid,  ses->Suid, tcon->tid, rc);
 399                 else
 400                         trace_smb3_rmdir_done(xid, ses->Suid, tcon->tid);
 401                 free_set_inf_compound(rqst);
 402                 break;
 403         case SMB2_OP_SET_EOF:
 404                 if (rc)
 405                         trace_smb3_set_eof_err(xid,  ses->Suid, tcon->tid, rc);
 406                 else
 407                         trace_smb3_set_eof_done(xid, ses->Suid, tcon->tid);
 408                 free_set_inf_compound(rqst);
 409                 break;
 410         case SMB2_OP_SET_INFO:
 411                 if (rc)
 412                         trace_smb3_set_info_compound_err(xid,  ses->Suid,
 413                                                 tcon->tid, rc);
 414                 else
 415                         trace_smb3_set_info_compound_done(xid, ses->Suid,
 416                                                 tcon->tid);
 417                 free_set_inf_compound(rqst);
 418                 break;
 419         }
 420         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 421         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 422         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
 423         return rc;
 424 }
 425
 426 void
 427 move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
 428 {
 429         memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
 430         dst->CurrentByteOffset = src->CurrentByteOffset;
 431         dst->Mode = src->Mode;
 432         dst->AlignmentRequirement = src->AlignmentRequirement;
 433         dst->IndexNumber1 = 0; /* we don't use it */
 434 }
 435
 436 int
 437 smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 438                      struct cifs_sb_info *cifs_sb, const char *full_path,
 439                      FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
 440 {
 441         int rc;
 442         struct smb2_file_all_info *smb2_data;
 443         __u32 create_options = 0;
 444         struct cifs_fid fid;
 445         bool no_cached_open = tcon->nohandlecache;
 446         struct cifsFileInfo *cfile;
 447
 448         *adjust_tz = false;
 449         *symlink = false;
 450
 451         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 452                             GFP_KERNEL);
 453         if (smb2_data == NULL)
 454                 return -ENOMEM;
 455
 456         /* If it is a root and its handle is cached then use it */
 457         if (!strlen(full_path) && !no_cached_open) {
 458                 rc = open_shroot(xid, tcon, cifs_sb, &fid);
 459                 if (rc)
 460                         goto out;
 461
 462                 if (tcon->crfid.file_all_info_is_valid) {
 463                         move_smb2_info_to_cifs(data,
 464                                                &tcon->crfid.file_all_info);
 465                 } else {
 466                         rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
 467                                              fid.volatile_fid, smb2_data);
 468                         if (!rc)
 469                                 move_smb2_info_to_cifs(data, smb2_data);
 470                 }
 471                 close_shroot(&tcon->crfid);
 472                 goto out;
 473         }
 474
 475         cifs_get_readable_path(tcon, full_path, &cfile);
 476         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 477                               FILE_READ_ATTRIBUTES, FILE_OPEN, create_options,
 478                               ACL_NO_MODE, smb2_data, SMB2_OP_QUERY_INFO, cfile);
 479         if (rc == -EOPNOTSUPP) {
 480                 *symlink = true;
 481                 create_options |= OPEN_REPARSE_POINT;
 482
 483                 /* Failed on a symbolic link - query a reparse point info */
 484                 rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 485                                       FILE_READ_ATTRIBUTES, FILE_OPEN,
 486                                       create_options, ACL_NO_MODE,
 487                                       smb2_data, SMB2_OP_QUERY_INFO, NULL);
 488         }
 489         if (rc)
 490                 goto out;
 491
 492         move_smb2_info_to_cifs(data, smb2_data);
 493 out:
 494         kfree(smb2_data);
 495         return rc;
 496 }
 497
 498 int
 499 smb2_mkdir(const unsigned int xid, struct inode *parent_inode, umode_t mode,
 500            struct cifs_tcon *tcon, const char *name,
 501            struct cifs_sb_info *cifs_sb)
 502 {
 503         return smb2_compound_op(xid, tcon, cifs_sb, name,
 504                                 FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 505                                 CREATE_NOT_FILE, mode, NULL, SMB2_OP_MKDIR,
 506                                 NULL);
 507 }
 508
 509 void
 510 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 511                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 512                    const unsigned int xid)
 513 {
 514         FILE_BASIC_INFO data;
 515         struct cifsInodeInfo *cifs_i;
 516         struct cifsFileInfo *cfile;
 517         u32 dosattrs;
 518         int tmprc;
 519
 520         memset(&data, 0, sizeof(data));
 521         cifs_i = CIFS_I(inode);
 522         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 523         data.Attributes = cpu_to_le32(dosattrs);
 524         cifs_get_writable_path(tcon, name, &cfile);
 525         tmprc = smb2_compound_op(xid, tcon, cifs_sb, name,
 526                                  FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 527                                  CREATE_NOT_FILE, ACL_NO_MODE,
 528                                  &data, SMB2_OP_SET_INFO, cfile);
 529         if (tmprc == 0)
 530                 cifs_i->cifsAttrs = dosattrs;
 531 }
 532
 533 int
 534 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 535            struct cifs_sb_info *cifs_sb)
 536 {
 537         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 538                                 CREATE_NOT_FILE, ACL_NO_MODE,
 539                                 NULL, SMB2_OP_RMDIR, NULL);
 540 }
 541
 542 int
 543 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 544             struct cifs_sb_info *cifs_sb)
 545 {
 546         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 547                                 CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 548                                 ACL_NO_MODE, NULL, SMB2_OP_DELETE, NULL);
 549 }
 550
 551 static int
 552 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 553                    const char *from_name, const char *to_name,
 554                    struct cifs_sb_info *cifs_sb, __u32 access, int command,
 555                    struct cifsFileInfo *cfile)
 556 {
 557         __le16 *smb2_to_name = NULL;
 558         int rc;
 559
 560         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 561         if (smb2_to_name == NULL) {
 562                 rc = -ENOMEM;
 563                 goto smb2_rename_path;
 564         }
 565         rc = smb2_compound_op(xid, tcon, cifs_sb, from_name, access,
 566                               FILE_OPEN, 0, ACL_NO_MODE, smb2_to_name,
 567                               command, cfile);
 568 smb2_rename_path:
 569         kfree(smb2_to_name);
 570         return rc;
 571 }
 572
 573 int
 574 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 575                  const char *from_name, const char *to_name,
 576                  struct cifs_sb_info *cifs_sb)
 577 {
 578         struct cifsFileInfo *cfile;
 579
 580         cifs_get_writable_path(tcon, from_name, &cfile);
 581
 582         return smb2_set_path_attr(xid, tcon, from_name, to_name,
 583                                   cifs_sb, DELETE, SMB2_OP_RENAME, cfile);
 584 }
 585
 586 int
 587 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 588                      const char *from_name, const char *to_name,
 589                      struct cifs_sb_info *cifs_sb)
 590 {
 591         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 592                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK,
 593                                   NULL);
 594 }
 595
 596 int
 597 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 598                    const char *full_path, __u64 size,
 599                    struct cifs_sb_info *cifs_sb, bool set_alloc)
 600 {
 601         __le64 eof = cpu_to_le64(size);
 602
 603         return smb2_compound_op(xid, tcon, cifs_sb, full_path,
 604                                 FILE_WRITE_DATA, FILE_OPEN, 0, ACL_NO_MODE,
 605                                 &eof, SMB2_OP_SET_EOF, NULL);
 606 }
 607
 608 int
 609 smb2_set_file_info(struct inode *inode, const char *full_path,
 610                    FILE_BASIC_INFO *buf, const unsigned int xid)
 611 {
 612         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 613         struct tcon_link *tlink;
 614         int rc;
 615
 616         if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
 617             (buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
 618             (buf->Attributes == 0))
 619                 return 0; /* would be a no op, no sense sending this */
 620
 621         tlink = cifs_sb_tlink(cifs_sb);
 622         if (IS_ERR(tlink))
 623                 return PTR_ERR(tlink);
 624
 625         rc = smb2_compound_op(xid, tlink_tcon(tlink), cifs_sb, full_path,
 626                               FILE_WRITE_ATTRIBUTES, FILE_OPEN,
 627                               0, ACL_NO_MODE, buf, SMB2_OP_SET_INFO, NULL);
 628         cifs_put_tlink(tlink);
 629         return rc;
 630 }