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 int
  41 smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
  42                  struct cifs_sb_info *cifs_sb, const char *full_path,
  43                  __u32 desired_access, __u32 create_disposition,
  44                  __u32 create_options, void *ptr, int command)
  45 {
  46         int rc;
  47         __le16 *utf16_path = NULL;
  48         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
  49         struct cifs_open_parms oparms;
  50         struct cifs_fid fid;
  51         struct cifs_ses *ses = tcon->ses;
  52         int num_rqst = 0;
  53         struct smb_rqst rqst[3];
  54         int resp_buftype[3];
  55         struct kvec rsp_iov[3];
  56         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
  57         struct kvec qi_iov[1];
  58         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
  59         struct kvec close_iov[1];
  60         struct smb2_query_info_rsp *qi_rsp = NULL;
  61         int flags = 0;
  62         __u8 delete_pending[8] = {1, 0, 0, 0, 0, 0, 0, 0};
  63         unsigned int size[2];
  64         void *data[2];
  65         struct smb2_file_rename_info rename_info;
  66         struct smb2_file_link_info link_info;
  67         int len;
  68
  69         if (smb3_encryption_required(tcon))
  70                 flags |= CIFS_TRANSFORM_REQ;
  71
  72         memset(rqst, 0, sizeof(rqst));
  73         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
  74         memset(rsp_iov, 0, sizeof(rsp_iov));
  75
  76         /* Open */
  77         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
  78         if (!utf16_path)
  79                 return -ENOMEM;
  80
  81         oparms.tcon = tcon;
  82         oparms.desired_access = desired_access;
  83         oparms.disposition = create_disposition;
  84         oparms.create_options = create_options;
  85         if (backup_cred(cifs_sb))
  86                 oparms.create_options |= CREATE_OPEN_BACKUP_INTENT;
  87         oparms.fid = &fid;
  88         oparms.reconnect = false;
  89
  90         memset(&open_iov, 0, sizeof(open_iov));
  91         rqst[num_rqst].rq_iov = open_iov;
  92         rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;
  93         rc = SMB2_open_init(tcon, &rqst[num_rqst], &oplock, &oparms,
  94                             utf16_path);
  95         kfree(utf16_path);
  96         if (rc)
  97                 goto finished;
  98
  99         smb2_set_next_command(tcon, &rqst[num_rqst++]);
 100
 101         /* Operation */
 102         switch (command) {
 103         case SMB2_OP_QUERY_INFO:
 104                 memset(&qi_iov, 0, sizeof(qi_iov));
 105                 rqst[num_rqst].rq_iov = qi_iov;
 106                 rqst[num_rqst].rq_nvec = 1;
 107
 108                 rc = SMB2_query_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 109                                 COMPOUND_FID, FILE_ALL_INFORMATION,
 110                                 SMB2_O_INFO_FILE, 0,
 111                                 sizeof(struct smb2_file_all_info) +
 112                                           PATH_MAX * 2, 0, NULL);
 113                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 114                 smb2_set_related(&rqst[num_rqst++]);
 115                 break;
 116         case SMB2_OP_DELETE:
 117                 break;
 118         case SMB2_OP_MKDIR:
 119                 /*
 120                  * Directories are created through parameters in the
 121                  * SMB2_open() call.
 122                  */
 123                 break;
 124         case SMB2_OP_RMDIR:
 125                 memset(&si_iov, 0, sizeof(si_iov));
 126                 rqst[num_rqst].rq_iov = si_iov;
 127                 rqst[num_rqst].rq_nvec = 1;
 128
 129                 size[0] = 1; /* sizeof __u8 See MS-FSCC section 2.4.11 */
 130                 data[0] = &delete_pending[0];
 131
 132                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 133                                         COMPOUND_FID, current->tgid,
 134                                         FILE_DISPOSITION_INFORMATION,
 135                                         SMB2_O_INFO_FILE, 0, data, size);
 136                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 137                 smb2_set_related(&rqst[num_rqst++]);
 138                 break;
 139         case SMB2_OP_SET_EOF:
 140                 memset(&si_iov, 0, sizeof(si_iov));
 141                 rqst[num_rqst].rq_iov = si_iov;
 142                 rqst[num_rqst].rq_nvec = 1;
 143
 144                 size[0] = 8; /* sizeof __le64 */
 145                 data[0] = ptr;
 146
 147                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 148                                         COMPOUND_FID, current->tgid,
 149                                         FILE_END_OF_FILE_INFORMATION,
 150                                         SMB2_O_INFO_FILE, 0, data, size);
 151                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 152                 smb2_set_related(&rqst[num_rqst++]);
 153                 break;
 154         case SMB2_OP_SET_INFO:
 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
 160                 size[0] = sizeof(FILE_BASIC_INFO);
 161                 data[0] = ptr;
 162
 163                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 164                                         COMPOUND_FID, current->tgid,
 165                                         FILE_BASIC_INFORMATION,
 166                                         SMB2_O_INFO_FILE, 0, data, size);
 167                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 168                 smb2_set_related(&rqst[num_rqst++]);
 169                 break;
 170         case SMB2_OP_RENAME:
 171                 memset(&si_iov, 0, sizeof(si_iov));
 172                 rqst[num_rqst].rq_iov = si_iov;
 173                 rqst[num_rqst].rq_nvec = 2;
 174
 175                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 176
 177                 rename_info.ReplaceIfExists = 1;
 178                 rename_info.RootDirectory = 0;
 179                 rename_info.FileNameLength = cpu_to_le32(len);
 180
 181                 size[0] = sizeof(struct smb2_file_rename_info);
 182                 data[0] = &rename_info;
 183
 184                 size[1] = len + 2 /* null */;
 185                 data[1] = (__le16 *)ptr;
 186
 187                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 188                                         COMPOUND_FID, current->tgid,
 189                                         FILE_RENAME_INFORMATION,
 190                                         SMB2_O_INFO_FILE, 0, data, size);
 191                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 192                 smb2_set_related(&rqst[num_rqst++]);
 193                 break;
 194         case SMB2_OP_HARDLINK:
 195                 memset(&si_iov, 0, sizeof(si_iov));
 196                 rqst[num_rqst].rq_iov = si_iov;
 197                 rqst[num_rqst].rq_nvec = 2;
 198
 199                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 200
 201                 link_info.ReplaceIfExists = 0;
 202                 link_info.RootDirectory = 0;
 203                 link_info.FileNameLength = cpu_to_le32(len);
 204
 205                 size[0] = sizeof(struct smb2_file_link_info);
 206                 data[0] = &link_info;
 207
 208                 size[1] = len + 2 /* null */;
 209                 data[1] = (__le16 *)ptr;
 210
 211                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 212                                         COMPOUND_FID, current->tgid,
 213                                         FILE_LINK_INFORMATION,
 214                                         SMB2_O_INFO_FILE, 0, data, size);
 215                 smb2_set_next_command(tcon, &rqst[num_rqst]);
 216                 smb2_set_related(&rqst[num_rqst++]);
 217                 break;
 218         default:
 219                 cifs_dbg(VFS, "Invalid command\n");
 220                 rc = -EINVAL;
 221         }
 222         if (rc)
 223                 goto finished;
 224
 225         /* Close */
 226         memset(&close_iov, 0, sizeof(close_iov));
 227         rqst[num_rqst].rq_iov = close_iov;
 228         rqst[num_rqst].rq_nvec = 1;
 229         rc = SMB2_close_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 230                              COMPOUND_FID);
 231         smb2_set_related(&rqst[num_rqst++]);
 232         if (rc)
 233                 goto finished;
 234
 235         rc = compound_send_recv(xid, ses, flags, num_rqst, rqst,
 236                                 resp_buftype, rsp_iov);
 237
 238  finished:
 239         SMB2_open_free(&rqst[0]);
 240         switch (command) {
 241         case SMB2_OP_QUERY_INFO:
 242                 if (rc == 0) {
 243                         qi_rsp = (struct smb2_query_info_rsp *)
 244                                 rsp_iov[1].iov_base;
 245                         rc = smb2_validate_and_copy_iov(
 246                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 247                                 le32_to_cpu(qi_rsp->OutputBufferLength),
 248                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
 249                                 ptr);
 250                 }
 251                 if (rqst[1].rq_iov)
 252                         SMB2_query_info_free(&rqst[1]);
 253                 if (rqst[2].rq_iov)
 254                         SMB2_close_free(&rqst[2]);
 255                 break;
 256         case SMB2_OP_DELETE:
 257         case SMB2_OP_MKDIR:
 258                 if (rqst[1].rq_iov)
 259                         SMB2_close_free(&rqst[1]);
 260                 break;
 261         case SMB2_OP_HARDLINK:
 262         case SMB2_OP_RENAME:
 263         case SMB2_OP_RMDIR:
 264         case SMB2_OP_SET_EOF:
 265         case SMB2_OP_SET_INFO:
 266                 if (rqst[1].rq_iov)
 267                         SMB2_set_info_free(&rqst[1]);
 268                 if (rqst[2].rq_iov)
 269                         SMB2_close_free(&rqst[2]);
 270                 break;
 271         }
 272         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 273         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 274         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
 275         return rc;
 276 }
 277
 278 void
 279 move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
 280 {
 281         memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
 282         dst->CurrentByteOffset = src->CurrentByteOffset;
 283         dst->Mode = src->Mode;
 284         dst->AlignmentRequirement = src->AlignmentRequirement;
 285         dst->IndexNumber1 = 0; /* we don't use it */
 286 }
 287
 288 int
 289 smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 290                      struct cifs_sb_info *cifs_sb, const char *full_path,
 291                      FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
 292 {
 293         int rc;
 294         struct smb2_file_all_info *smb2_data;
 295         __u32 create_options = 0;
 296         struct cifs_fid fid;
 297         bool no_cached_open = tcon->nohandlecache;
 298
 299         *adjust_tz = false;
 300         *symlink = false;
 301
 302         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 303                             GFP_KERNEL);
 304         if (smb2_data == NULL)
 305                 return -ENOMEM;
 306
 307         /* If it is a root and its handle is cached then use it */
 308         if (!strlen(full_path) && !no_cached_open) {
 309                 rc = open_shroot(xid, tcon, &fid);
 310                 if (rc)
 311                         goto out;
 312                 rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
 313                                      fid.volatile_fid, smb2_data);
 314                 close_shroot(&tcon->crfid);
 315                 if (rc)
 316                         goto out;
 317                 move_smb2_info_to_cifs(data, smb2_data);
 318                 goto out;
 319         }
 320
 321         if (backup_cred(cifs_sb))
 322                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 323
 324         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 325                               FILE_READ_ATTRIBUTES, FILE_OPEN, create_options,
 326                               smb2_data, SMB2_OP_QUERY_INFO);
 327         if (rc == -EOPNOTSUPP) {
 328                 *symlink = true;
 329                 create_options |= OPEN_REPARSE_POINT;
 330
 331                 /* Failed on a symbolic link - query a reparse point info */
 332                 rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 333                                       FILE_READ_ATTRIBUTES, FILE_OPEN,
 334                                       create_options, smb2_data,
 335                                       SMB2_OP_QUERY_INFO);
 336         }
 337         if (rc)
 338                 goto out;
 339
 340         move_smb2_info_to_cifs(data, smb2_data);
 341 out:
 342         kfree(smb2_data);
 343         return rc;
 344 }
 345
 346 int
 347 smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 348            struct cifs_sb_info *cifs_sb)
 349 {
 350         return smb2_compound_op(xid, tcon, cifs_sb, name,
 351                                 FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 352                                 CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
 353 }
 354
 355 void
 356 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 357                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 358                    const unsigned int xid)
 359 {
 360         FILE_BASIC_INFO data;
 361         struct cifsInodeInfo *cifs_i;
 362         u32 dosattrs;
 363         int tmprc;
 364
 365         memset(&data, 0, sizeof(data));
 366         cifs_i = CIFS_I(inode);
 367         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 368         data.Attributes = cpu_to_le32(dosattrs);
 369         tmprc = smb2_compound_op(xid, tcon, cifs_sb, name,
 370                                  FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 371                                  CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
 372         if (tmprc == 0)
 373                 cifs_i->cifsAttrs = dosattrs;
 374 }
 375
 376 int
 377 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 378            struct cifs_sb_info *cifs_sb)
 379 {
 380         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 381                                 CREATE_NOT_FILE,
 382                                 NULL, SMB2_OP_RMDIR);
 383 }
 384
 385 int
 386 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 387             struct cifs_sb_info *cifs_sb)
 388 {
 389         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 390                                 CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 391                                 NULL, SMB2_OP_DELETE);
 392 }
 393
 394 static int
 395 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 396                    const char *from_name, const char *to_name,
 397                    struct cifs_sb_info *cifs_sb, __u32 access, int command)
 398 {
 399         __le16 *smb2_to_name = NULL;
 400         int rc;
 401
 402         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 403         if (smb2_to_name == NULL) {
 404                 rc = -ENOMEM;
 405                 goto smb2_rename_path;
 406         }
 407         rc = smb2_compound_op(xid, tcon, cifs_sb, from_name, access,
 408                               FILE_OPEN, 0, smb2_to_name, command);
 409 smb2_rename_path:
 410         kfree(smb2_to_name);
 411         return rc;
 412 }
 413
 414 int
 415 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 416                  const char *from_name, const char *to_name,
 417                  struct cifs_sb_info *cifs_sb)
 418 {
 419         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 420                                   DELETE, SMB2_OP_RENAME);
 421 }
 422
 423 int
 424 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 425                      const char *from_name, const char *to_name,
 426                      struct cifs_sb_info *cifs_sb)
 427 {
 428         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 429                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
 430 }
 431
 432 int
 433 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 434                    const char *full_path, __u64 size,
 435                    struct cifs_sb_info *cifs_sb, bool set_alloc)
 436 {
 437         __le64 eof = cpu_to_le64(size);
 438
 439         return smb2_compound_op(xid, tcon, cifs_sb, full_path,
 440                                 FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
 441                                 SMB2_OP_SET_EOF);
 442 }
 443
 444 int
 445 smb2_set_file_info(struct inode *inode, const char *full_path,
 446                    FILE_BASIC_INFO *buf, const unsigned int xid)
 447 {
 448         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 449         struct tcon_link *tlink;
 450         int rc;
 451
 452         if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
 453             (buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
 454             (buf->Attributes == 0))
 455                 return 0; /* would be a no op, no sense sending this */
 456
 457         tlink = cifs_sb_tlink(cifs_sb);
 458         if (IS_ERR(tlink))
 459                 return PTR_ERR(tlink);
 460
 461         rc = smb2_compound_op(xid, tlink_tcon(tlink), cifs_sb, full_path,
 462                               FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, buf,
 463                               SMB2_OP_SET_INFO);
 464         cifs_put_tlink(tlink);
 465         return rc;
 466 }