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 ([email protected]),
   7  *              Steve French ([email protected])
   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, void *ptr, int command)
  55 {
  56         int rc;
  57         __le16 *utf16_path = NULL;
  58         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
  59         struct cifs_open_parms oparms;
  60         struct cifs_fid fid;
  61         struct cifs_ses *ses = tcon->ses;
  62         int num_rqst = 0;
  63         struct smb_rqst rqst[3];
  64         int resp_buftype[3];
  65         struct kvec rsp_iov[3];
  66         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
  67         struct kvec qi_iov[1];
  68         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
  69         struct kvec close_iov[1];
  70         struct smb2_query_info_rsp *qi_rsp = NULL;
  71         int flags = 0;
  72         __u8 delete_pending[8] = {1, 0, 0, 0, 0, 0, 0, 0};
  73         unsigned int size[2];
  74         void *data[2];
  75         struct smb2_file_rename_info rename_info;
  76         struct smb2_file_link_info link_info;
  77         int len;
  78
  79         if (smb3_encryption_required(tcon))
  80                 flags |= CIFS_TRANSFORM_REQ;
  81
  82         memset(rqst, 0, sizeof(rqst));
  83         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
  84         memset(rsp_iov, 0, sizeof(rsp_iov));
  85
  86         /* Open */
  87         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
  88         if (!utf16_path)
  89                 return -ENOMEM;
  90
  91         oparms.tcon = tcon;
  92         oparms.desired_access = desired_access;
  93         oparms.disposition = create_disposition;
  94         oparms.create_options = create_options;
  95         if (backup_cred(cifs_sb))
  96                 oparms.create_options |= CREATE_OPEN_BACKUP_INTENT;
  97         oparms.fid = &fid;
  98         oparms.reconnect = false;
  99
 100         memset(&open_iov, 0, sizeof(open_iov));
 101         rqst[num_rqst].rq_iov = open_iov;
 102         rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;
 103         rc = SMB2_open_init(tcon, &rqst[num_rqst], &oplock, &oparms,
 104                             utf16_path);
 105         kfree(utf16_path);
 106         if (rc)
 107                 goto finished;
 108
 109         smb2_set_next_command(tcon, &rqst[num_rqst++]);
 110
 111         /* Operation */
 112         switch (command) {
 113         case SMB2_OP_QUERY_INFO:
 114                 memset(&qi_iov, 0, sizeof(qi_iov));
 115                 rqst[num_rqst].rq_iov = qi_iov;
 116                 rqst[num_rqst].rq_nvec = 1;
 117
 118                 rc = SMB2_query_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 119                                 COMPOUND_FID, FILE_ALL_INFORMATION,
 120                                 SMB2_O_INFO_FILE, 0,
 121                                 sizeof(struct smb2_file_all_info) +
 122                                           PATH_MAX * 2, 0, NULL);
 123                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 124                 smb2_set_related(&rqst[num_rqst++]);
 125                 trace_smb3_query_info_compound_enter(xid, ses->Suid, tcon->tid,
 126                                                      full_path);
 127                 break;
 128         case SMB2_OP_DELETE:
 129                 trace_smb3_delete_enter(xid, ses->Suid, tcon->tid, full_path);
 130                 break;
 131         case SMB2_OP_MKDIR:
 132                 /*
 133                  * Directories are created through parameters in the
 134                  * SMB2_open() call.
 135                  */
 136                 trace_smb3_mkdir_enter(xid, ses->Suid, tcon->tid, full_path);
 137                 break;
 138         case SMB2_OP_RMDIR:
 139                 memset(&si_iov, 0, sizeof(si_iov));
 140                 rqst[num_rqst].rq_iov = si_iov;
 141                 rqst[num_rqst].rq_nvec = 1;
 142
 143                 size[0] = 1; /* sizeof __u8 See MS-FSCC section 2.4.11 */
 144                 data[0] = &delete_pending[0];
 145
 146                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 147                                         COMPOUND_FID, current->tgid,
 148                                         FILE_DISPOSITION_INFORMATION,
 149                                         SMB2_O_INFO_FILE, 0, data, size);
 150                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 151                 smb2_set_related(&rqst[num_rqst++]);
 152                 trace_smb3_rmdir_enter(xid, ses->Suid, tcon->tid, full_path);
 153                 break;
 154         case SMB2_OP_SET_EOF:
 155                 memset(&si_iov, 0, sizeof(si_iov));
 156                 rqst[num_rqst].rq_iov = si_iov;
 157                 rqst[num_rqst].rq_nvec = 1;
 158
 159                 size[0] = 8; /* sizeof __le64 */
 160                 data[0] = ptr;
 161
 162                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 163                                         COMPOUND_FID, current->tgid,
 164                                         FILE_END_OF_FILE_INFORMATION,
 165                                         SMB2_O_INFO_FILE, 0, data, size);
 166                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 167                 smb2_set_related(&rqst[num_rqst++]);
 168                 trace_smb3_set_eof_enter(xid, ses->Suid, tcon->tid, full_path);
 169                 break;
 170         case SMB2_OP_SET_INFO:
 171                 memset(&si_iov, 0, sizeof(si_iov));
 172                 rqst[num_rqst].rq_iov = si_iov;
 173                 rqst[num_rqst].rq_nvec = 1;
 174
 175
 176                 size[0] = sizeof(FILE_BASIC_INFO);
 177                 data[0] = ptr;
 178
 179                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 180                                         COMPOUND_FID, current->tgid,
 181                                         FILE_BASIC_INFORMATION,
 182                                         SMB2_O_INFO_FILE, 0, data, size);
 183                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 184                 smb2_set_related(&rqst[num_rqst++]);
 185                 trace_smb3_set_info_compound_enter(xid, ses->Suid, tcon->tid,
 186                                                    full_path);
 187                 break;
 188         case SMB2_OP_RENAME:
 189                 memset(&si_iov, 0, sizeof(si_iov));
 190                 rqst[num_rqst].rq_iov = si_iov;
 191                 rqst[num_rqst].rq_nvec = 2;
 192
 193                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 194
 195                 rename_info.ReplaceIfExists = 1;
 196                 rename_info.RootDirectory = 0;
 197                 rename_info.FileNameLength = cpu_to_le32(len);
 198
 199                 size[0] = sizeof(struct smb2_file_rename_info);
 200                 data[0] = &rename_info;
 201
 202                 size[1] = len + 2 /* null */;
 203                 data[1] = (__le16 *)ptr;
 204
 205                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 206                                         COMPOUND_FID, current->tgid,
 207                                         FILE_RENAME_INFORMATION,
 208                                         SMB2_O_INFO_FILE, 0, data, size);
 209                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 210                 smb2_set_related(&rqst[num_rqst++]);
 211                 trace_smb3_rename_enter(xid, ses->Suid, tcon->tid, full_path);
 212                 break;
 213         case SMB2_OP_HARDLINK:
 214                 memset(&si_iov, 0, sizeof(si_iov));
 215                 rqst[num_rqst].rq_iov = si_iov;
 216                 rqst[num_rqst].rq_nvec = 2;
 217
 218                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 219
 220                 link_info.ReplaceIfExists = 0;
 221                 link_info.RootDirectory = 0;
 222                 link_info.FileNameLength = cpu_to_le32(len);
 223
 224                 size[0] = sizeof(struct smb2_file_link_info);
 225                 data[0] = &link_info;
 226
 227                 size[1] = len + 2 /* null */;
 228                 data[1] = (__le16 *)ptr;
 229
 230                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 231                                         COMPOUND_FID, current->tgid,
 232                                         FILE_LINK_INFORMATION,
 233                                         SMB2_O_INFO_FILE, 0, data, size);
 234                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 235                 smb2_set_related(&rqst[num_rqst++]);
 236                 trace_smb3_hardlink_enter(xid, ses->Suid, tcon->tid, full_path);
 237                 break;
 238         default:
 239                 cifs_dbg(VFS, "Invalid command\n");
 240                 rc = -EINVAL;
 241         }
 242         if (rc)
 243                 goto finished;
 244
 245         /* Close */
 246         memset(&close_iov, 0, sizeof(close_iov));
 247         rqst[num_rqst].rq_iov = close_iov;
 248         rqst[num_rqst].rq_nvec = 1;
 249         rc = SMB2_close_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 250                              COMPOUND_FID);
 251         smb2_set_related(&rqst[num_rqst++]);
 252         if (rc)
 253                 goto finished;
 254
 255         rc = compound_send_recv(xid, ses, flags, num_rqst, rqst,
 256                                 resp_buftype, rsp_iov);
 257
 258  finished:
 259         SMB2_open_free(&rqst[0]);
 260         switch (command) {
 261         case SMB2_OP_QUERY_INFO:
 262                 if (rc == 0) {
 263                         qi_rsp = (struct smb2_query_info_rsp *)
 264                                 rsp_iov[1].iov_base;
 265                         rc = smb2_validate_and_copy_iov(
 266                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 267                                 le32_to_cpu(qi_rsp->OutputBufferLength),
 268                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
 269                                 ptr);
 270                 }
 271                 if (rqst[1].rq_iov)
 272                         SMB2_query_info_free(&rqst[1]);
 273                 if (rqst[2].rq_iov)
 274                         SMB2_close_free(&rqst[2]);
 275                 if (rc)
 276                         trace_smb3_query_info_compound_err(xid,  ses->Suid,
 277                                                 tcon->tid, rc);
 278                 else
 279                         trace_smb3_query_info_compound_done(xid, ses->Suid,
 280                                                 tcon->tid);
 281                 break;
 282         case SMB2_OP_DELETE:
 283                 if (rc)
 284                         trace_smb3_delete_err(xid,  ses->Suid, tcon->tid, rc);
 285                 else
 286                         trace_smb3_delete_done(xid, ses->Suid, tcon->tid);
 287                 if (rqst[1].rq_iov)
 288                         SMB2_close_free(&rqst[1]);
 289                 break;
 290         case SMB2_OP_MKDIR:
 291                 if (rc)
 292                         trace_smb3_mkdir_err(xid,  ses->Suid, tcon->tid, rc);
 293                 else
 294                         trace_smb3_mkdir_done(xid, ses->Suid, tcon->tid);
 295                 if (rqst[1].rq_iov)
 296                         SMB2_close_free(&rqst[1]);
 297                 break;
 298         case SMB2_OP_HARDLINK:
 299                 if (rc)
 300                         trace_smb3_hardlink_err(xid,  ses->Suid, tcon->tid, rc);
 301                 else
 302                         trace_smb3_hardlink_done(xid, ses->Suid, tcon->tid);
 303                 free_set_inf_compound(rqst);
 304                 break;
 305         case SMB2_OP_RENAME:
 306                 if (rc)
 307                         trace_smb3_rename_err(xid,  ses->Suid, tcon->tid, rc);
 308                 else
 309                         trace_smb3_rename_done(xid, ses->Suid, tcon->tid);
 310                 free_set_inf_compound(rqst);
 311                 break;
 312         case SMB2_OP_RMDIR:
 313                 if (rc)
 314                         trace_smb3_rmdir_err(xid,  ses->Suid, tcon->tid, rc);
 315                 else
 316                         trace_smb3_rmdir_done(xid, ses->Suid, tcon->tid);
 317                 free_set_inf_compound(rqst);
 318                 break;
 319         case SMB2_OP_SET_EOF:
 320                 if (rc)
 321                         trace_smb3_set_eof_err(xid,  ses->Suid, tcon->tid, rc);
 322                 else
 323                         trace_smb3_set_eof_done(xid, ses->Suid, tcon->tid);
 324                 free_set_inf_compound(rqst);
 325                 break;
 326         case SMB2_OP_SET_INFO:
 327                 if (rc)
 328                         trace_smb3_set_info_compound_err(xid,  ses->Suid,
 329                                                 tcon->tid, rc);
 330                 else
 331                         trace_smb3_set_info_compound_done(xid, ses->Suid,
 332                                                 tcon->tid);
 333                 free_set_inf_compound(rqst);
 334                 break;
 335         }
 336         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 337         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 338         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
 339         return rc;
 340 }
 341
 342 void
 343 move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
 344 {
 345         memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
 346         dst->CurrentByteOffset = src->CurrentByteOffset;
 347         dst->Mode = src->Mode;
 348         dst->AlignmentRequirement = src->AlignmentRequirement;
 349         dst->IndexNumber1 = 0; /* we don't use it */
 350 }
 351
 352 int
 353 smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 354                      struct cifs_sb_info *cifs_sb, const char *full_path,
 355                      FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
 356 {
 357         int rc;
 358         struct smb2_file_all_info *smb2_data;
 359         __u32 create_options = 0;
 360         struct cifs_fid fid;
 361         bool no_cached_open = tcon->nohandlecache;
 362
 363         *adjust_tz = false;
 364         *symlink = false;
 365
 366         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 367                             GFP_KERNEL);
 368         if (smb2_data == NULL)
 369                 return -ENOMEM;
 370
 371         /* If it is a root and its handle is cached then use it */
 372         if (!strlen(full_path) && !no_cached_open) {
 373                 rc = open_shroot(xid, tcon, &fid);
 374                 if (rc)
 375                         goto out;
 376
 377                 if (tcon->crfid.file_all_info_is_valid) {
 378                         move_smb2_info_to_cifs(data,
 379                                                &tcon->crfid.file_all_info);
 380                 } else {
 381                         rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
 382                                              fid.volatile_fid, smb2_data);
 383                         if (!rc)
 384                                 move_smb2_info_to_cifs(data, smb2_data);
 385                 }
 386                 close_shroot(&tcon->crfid);
 387                 goto out;
 388         }
 389
 390         if (backup_cred(cifs_sb))
 391                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 392
 393         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 394                               FILE_READ_ATTRIBUTES, FILE_OPEN, create_options,
 395                               smb2_data, SMB2_OP_QUERY_INFO);
 396         if (rc == -EOPNOTSUPP) {
 397                 *symlink = true;
 398                 create_options |= OPEN_REPARSE_POINT;
 399
 400                 /* Failed on a symbolic link - query a reparse point info */
 401                 rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 402                                       FILE_READ_ATTRIBUTES, FILE_OPEN,
 403                                       create_options, smb2_data,
 404                                       SMB2_OP_QUERY_INFO);
 405         }
 406         if (rc)
 407                 goto out;
 408
 409         move_smb2_info_to_cifs(data, smb2_data);
 410 out:
 411         kfree(smb2_data);
 412         return rc;
 413 }
 414
 415 int
 416 smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 417            struct cifs_sb_info *cifs_sb)
 418 {
 419         return smb2_compound_op(xid, tcon, cifs_sb, name,
 420                                 FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 421                                 CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
 422 }
 423
 424 void
 425 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 426                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 427                    const unsigned int xid)
 428 {
 429         FILE_BASIC_INFO data;
 430         struct cifsInodeInfo *cifs_i;
 431         u32 dosattrs;
 432         int tmprc;
 433
 434         memset(&data, 0, sizeof(data));
 435         cifs_i = CIFS_I(inode);
 436         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 437         data.Attributes = cpu_to_le32(dosattrs);
 438         tmprc = smb2_compound_op(xid, tcon, cifs_sb, name,
 439                                  FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 440                                  CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
 441         if (tmprc == 0)
 442                 cifs_i->cifsAttrs = dosattrs;
 443 }
 444
 445 int
 446 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 447            struct cifs_sb_info *cifs_sb)
 448 {
 449         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 450                                 CREATE_NOT_FILE,
 451                                 NULL, SMB2_OP_RMDIR);
 452 }
 453
 454 int
 455 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 456             struct cifs_sb_info *cifs_sb)
 457 {
 458         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 459                                 CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 460                                 NULL, SMB2_OP_DELETE);
 461 }
 462
 463 static int
 464 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 465                    const char *from_name, const char *to_name,
 466                    struct cifs_sb_info *cifs_sb, __u32 access, int command)
 467 {
 468         __le16 *smb2_to_name = NULL;
 469         int rc;
 470
 471         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 472         if (smb2_to_name == NULL) {
 473                 rc = -ENOMEM;
 474                 goto smb2_rename_path;
 475         }
 476         rc = smb2_compound_op(xid, tcon, cifs_sb, from_name, access,
 477                               FILE_OPEN, 0, smb2_to_name, command);
 478 smb2_rename_path:
 479         kfree(smb2_to_name);
 480         return rc;
 481 }
 482
 483 int
 484 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 485                  const char *from_name, const char *to_name,
 486                  struct cifs_sb_info *cifs_sb)
 487 {
 488         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 489                                   DELETE, SMB2_OP_RENAME);
 490 }
 491
 492 int
 493 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 494                      const char *from_name, const char *to_name,
 495                      struct cifs_sb_info *cifs_sb)
 496 {
 497         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 498                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
 499 }
 500
 501 int
 502 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 503                    const char *full_path, __u64 size,
 504                    struct cifs_sb_info *cifs_sb, bool set_alloc)
 505 {
 506         __le64 eof = cpu_to_le64(size);
 507
 508         return smb2_compound_op(xid, tcon, cifs_sb, full_path,
 509                                 FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
 510                                 SMB2_OP_SET_EOF);
 511 }
 512
 513 int
 514 smb2_set_file_info(struct inode *inode, const char *full_path,
 515                    FILE_BASIC_INFO *buf, const unsigned int xid)
 516 {
 517         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 518         struct tcon_link *tlink;
 519         int rc;
 520
 521         if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
 522             (buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
 523             (buf->Attributes == 0))
 524                 return 0; /* would be a no op, no sense sending this */
 525
 526         tlink = cifs_sb_tlink(cifs_sb);
 527         if (IS_ERR(tlink))
 528                 return PTR_ERR(tlink);
 529
 530         rc = smb2_compound_op(xid, tlink_tcon(tlink), cifs_sb, full_path,
 531                               FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, buf,
 532                               SMB2_OP_SET_INFO);
 533         cifs_put_tlink(tlink);
 534         return rc;
 535 }