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 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         struct TCP_Server_Info *server = ses->server;
  53         int num_rqst = 0;
  54         struct smb_rqst rqst[3];
  55         int resp_buftype[3];
  56         struct kvec rsp_iov[3];
  57         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
  58         struct kvec qi_iov[1];
  59         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
  60         struct kvec close_iov[1];
  61         struct smb2_query_info_rsp *qi_rsp = NULL;
  62         int flags = 0;
  63         __u8 delete_pending[8] = {1, 0, 0, 0, 0, 0, 0, 0};
  64         unsigned int size[2];
  65         void *data[2];
  66         struct smb2_file_rename_info rename_info;
  67         struct smb2_file_link_info link_info;
  68         int len;
  69
  70         if (smb3_encryption_required(tcon))
  71                 flags |= CIFS_TRANSFORM_REQ;
  72
  73         memset(rqst, 0, sizeof(rqst));
  74         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
  75         memset(rsp_iov, 0, sizeof(rsp_iov));
  76
  77         /* Open */
  78         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
  79         if (!utf16_path)
  80                 return -ENOMEM;
  81
  82         oparms.tcon = tcon;
  83         oparms.desired_access = desired_access;
  84         oparms.disposition = create_disposition;
  85         oparms.create_options = create_options;
  86         if (backup_cred(cifs_sb))
  87                 oparms.create_options |= CREATE_OPEN_BACKUP_INTENT;
  88         oparms.fid = &fid;
  89         oparms.reconnect = false;
  90
  91         memset(&open_iov, 0, sizeof(open_iov));
  92         rqst[num_rqst].rq_iov = open_iov;
  93         rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;
  94         rc = SMB2_open_init(tcon, &rqst[num_rqst], &oplock, &oparms,
  95                             utf16_path);
  96         kfree(utf16_path);
  97         if (rc)
  98                 goto finished;
  99
 100         smb2_set_next_command(server, &rqst[num_rqst++], 0);
 101
 102         /* Operation */
 103         switch (command) {
 104         case SMB2_OP_QUERY_INFO:
 105                 memset(&qi_iov, 0, sizeof(qi_iov));
 106                 rqst[num_rqst].rq_iov = qi_iov;
 107                 rqst[num_rqst].rq_nvec = 1;
 108
 109                 rc = SMB2_query_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 110                                 COMPOUND_FID, FILE_ALL_INFORMATION,
 111                                 SMB2_O_INFO_FILE, 0,
 112                                 sizeof(struct smb2_file_all_info) +
 113                                           PATH_MAX * 2, 0, NULL);
 114                 smb2_set_next_command(server, &rqst[num_rqst], 0);
 115                 smb2_set_related(&rqst[num_rqst++]);
 116                 break;
 117         case SMB2_OP_DELETE:
 118                 break;
 119         case SMB2_OP_MKDIR:
 120                 /*
 121                  * Directories are created through parameters in the
 122                  * SMB2_open() call.
 123                  */
 124                 break;
 125         case SMB2_OP_RMDIR:
 126                 memset(&si_iov, 0, sizeof(si_iov));
 127                 rqst[num_rqst].rq_iov = si_iov;
 128                 rqst[num_rqst].rq_nvec = 1;
 129
 130                 size[0] = 1; /* sizeof __u8 See MS-FSCC section 2.4.11 */
 131                 data[0] = &delete_pending[0];
 132
 133                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 134                                         COMPOUND_FID, current->tgid,
 135                                         FILE_DISPOSITION_INFORMATION,
 136                                         SMB2_O_INFO_FILE, 0, data, size);
 137                 smb2_set_next_command(server, &rqst[num_rqst], 1);
 138                 smb2_set_related(&rqst[num_rqst++]);
 139                 break;
 140         case SMB2_OP_SET_EOF:
 141                 memset(&si_iov, 0, sizeof(si_iov));
 142                 rqst[num_rqst].rq_iov = si_iov;
 143                 rqst[num_rqst].rq_nvec = 1;
 144
 145                 size[0] = 8; /* sizeof __le64 */
 146                 data[0] = ptr;
 147
 148                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 149                                         COMPOUND_FID, current->tgid,
 150                                         FILE_END_OF_FILE_INFORMATION,
 151                                         SMB2_O_INFO_FILE, 0, data, size);
 152                 smb2_set_next_command(server, &rqst[num_rqst], 0);
 153                 smb2_set_related(&rqst[num_rqst++]);
 154                 break;
 155         case SMB2_OP_SET_INFO:
 156                 memset(&si_iov, 0, sizeof(si_iov));
 157                 rqst[num_rqst].rq_iov = si_iov;
 158                 rqst[num_rqst].rq_nvec = 1;
 159
 160
 161                 size[0] = sizeof(FILE_BASIC_INFO);
 162                 data[0] = ptr;
 163
 164                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 165                                         COMPOUND_FID, current->tgid,
 166                                         FILE_BASIC_INFORMATION,
 167                                         SMB2_O_INFO_FILE, 0, data, size);
 168                 smb2_set_next_command(server, &rqst[num_rqst], 0);
 169                 smb2_set_related(&rqst[num_rqst++]);
 170                 break;
 171         case SMB2_OP_RENAME:
 172                 memset(&si_iov, 0, sizeof(si_iov));
 173                 rqst[num_rqst].rq_iov = si_iov;
 174                 rqst[num_rqst].rq_nvec = 2;
 175
 176                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 177
 178                 rename_info.ReplaceIfExists = 1;
 179                 rename_info.RootDirectory = 0;
 180                 rename_info.FileNameLength = cpu_to_le32(len);
 181
 182                 size[0] = sizeof(struct smb2_file_rename_info);
 183                 data[0] = &rename_info;
 184
 185                 size[1] = len + 2 /* null */;
 186                 data[1] = (__le16 *)ptr;
 187
 188                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 189                                         COMPOUND_FID, current->tgid,
 190                                         FILE_RENAME_INFORMATION,
 191                                         SMB2_O_INFO_FILE, 0, data, size);
 192                 smb2_set_next_command(server, &rqst[num_rqst], 0);
 193                 smb2_set_related(&rqst[num_rqst++]);
 194                 break;
 195         case SMB2_OP_HARDLINK:
 196                 memset(&si_iov, 0, sizeof(si_iov));
 197                 rqst[num_rqst].rq_iov = si_iov;
 198                 rqst[num_rqst].rq_nvec = 2;
 199
 200                 len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));
 201
 202                 link_info.ReplaceIfExists = 0;
 203                 link_info.RootDirectory = 0;
 204                 link_info.FileNameLength = cpu_to_le32(len);
 205
 206                 size[0] = sizeof(struct smb2_file_link_info);
 207                 data[0] = &link_info;
 208
 209                 size[1] = len + 2 /* null */;
 210                 data[1] = (__le16 *)ptr;
 211
 212                 rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 213                                         COMPOUND_FID, current->tgid,
 214                                         FILE_LINK_INFORMATION,
 215                                         SMB2_O_INFO_FILE, 0, data, size);
 216                 smb2_set_next_command(server, &rqst[num_rqst], 0);
 217                 smb2_set_related(&rqst[num_rqst++]);
 218                 break;
 219         default:
 220                 cifs_dbg(VFS, "Invalid command\n");
 221                 rc = -EINVAL;
 222         }
 223         if (rc)
 224                 goto finished;
 225
 226         /* Close */
 227         memset(&close_iov, 0, sizeof(close_iov));
 228         rqst[num_rqst].rq_iov = close_iov;
 229         rqst[num_rqst].rq_nvec = 1;
 230         rc = SMB2_close_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 231                              COMPOUND_FID);
 232         smb2_set_related(&rqst[num_rqst++]);
 233         if (rc)
 234                 goto finished;
 235
 236         rc = compound_send_recv(xid, ses, flags, num_rqst, rqst,
 237                                 resp_buftype, rsp_iov);
 238
 239  finished:
 240         SMB2_open_free(&rqst[0]);
 241         switch (command) {
 242         case SMB2_OP_QUERY_INFO:
 243                 if (rc == 0) {
 244                         qi_rsp = (struct smb2_query_info_rsp *)
 245                                 rsp_iov[1].iov_base;
 246                         rc = smb2_validate_and_copy_iov(
 247                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 248                                 le32_to_cpu(qi_rsp->OutputBufferLength),
 249                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
 250                                 ptr);
 251                 }
 252                 if (rqst[1].rq_iov)
 253                         SMB2_query_info_free(&rqst[1]);
 254                 if (rqst[2].rq_iov)
 255                         SMB2_close_free(&rqst[2]);
 256                 break;
 257         case SMB2_OP_DELETE:
 258         case SMB2_OP_MKDIR:
 259                 if (rqst[1].rq_iov)
 260                         SMB2_close_free(&rqst[1]);
 261                 break;
 262         case SMB2_OP_HARDLINK:
 263         case SMB2_OP_RENAME:
 264         case SMB2_OP_RMDIR:
 265         case SMB2_OP_SET_EOF:
 266         case SMB2_OP_SET_INFO:
 267                 if (rqst[1].rq_iov)
 268                         SMB2_set_info_free(&rqst[1]);
 269                 if (rqst[2].rq_iov)
 270                         SMB2_close_free(&rqst[2]);
 271                 break;
 272         }
 273         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 274         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 275         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
 276         return rc;
 277 }
 278
 279 void
 280 move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
 281 {
 282         memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
 283         dst->CurrentByteOffset = src->CurrentByteOffset;
 284         dst->Mode = src->Mode;
 285         dst->AlignmentRequirement = src->AlignmentRequirement;
 286         dst->IndexNumber1 = 0; /* we don't use it */
 287 }
 288
 289 int
 290 smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 291                      struct cifs_sb_info *cifs_sb, const char *full_path,
 292                      FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
 293 {
 294         int rc;
 295         struct smb2_file_all_info *smb2_data;
 296         __u32 create_options = 0;
 297
 298         *adjust_tz = false;
 299         *symlink = false;
 300
 301         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 302                             GFP_KERNEL);
 303         if (smb2_data == NULL)
 304                 return -ENOMEM;
 305         if (backup_cred(cifs_sb))
 306                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 307
 308         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 309                               FILE_READ_ATTRIBUTES, FILE_OPEN, create_options,
 310                               smb2_data, SMB2_OP_QUERY_INFO);
 311         if (rc == -EOPNOTSUPP) {
 312                 *symlink = true;
 313                 create_options |= OPEN_REPARSE_POINT;
 314
 315                 /* Failed on a symbolic link - query a reparse point info */
 316                 rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 317                                       FILE_READ_ATTRIBUTES, FILE_OPEN,
 318                                       create_options, smb2_data,
 319                                       SMB2_OP_QUERY_INFO);
 320         }
 321         if (rc)
 322                 goto out;
 323
 324         move_smb2_info_to_cifs(data, smb2_data);
 325 out:
 326         kfree(smb2_data);
 327         return rc;
 328 }
 329
 330 int
 331 smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 332            struct cifs_sb_info *cifs_sb)
 333 {
 334         return smb2_compound_op(xid, tcon, cifs_sb, name,
 335                                 FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 336                                 CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
 337 }
 338
 339 void
 340 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 341                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 342                    const unsigned int xid)
 343 {
 344         FILE_BASIC_INFO data;
 345         struct cifsInodeInfo *cifs_i;
 346         u32 dosattrs;
 347         int tmprc;
 348
 349         memset(&data, 0, sizeof(data));
 350         cifs_i = CIFS_I(inode);
 351         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 352         data.Attributes = cpu_to_le32(dosattrs);
 353         tmprc = smb2_compound_op(xid, tcon, cifs_sb, name,
 354                                  FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 355                                  CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
 356         if (tmprc == 0)
 357                 cifs_i->cifsAttrs = dosattrs;
 358 }
 359
 360 int
 361 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 362            struct cifs_sb_info *cifs_sb)
 363 {
 364         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 365                                 CREATE_NOT_FILE,
 366                                 NULL, SMB2_OP_RMDIR);
 367 }
 368
 369 int
 370 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 371             struct cifs_sb_info *cifs_sb)
 372 {
 373         return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 374                                 CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 375                                 NULL, SMB2_OP_DELETE);
 376 }
 377
 378 static int
 379 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 380                    const char *from_name, const char *to_name,
 381                    struct cifs_sb_info *cifs_sb, __u32 access, int command)
 382 {
 383         __le16 *smb2_to_name = NULL;
 384         int rc;
 385
 386         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 387         if (smb2_to_name == NULL) {
 388                 rc = -ENOMEM;
 389                 goto smb2_rename_path;
 390         }
 391
 392         rc = smb2_compound_op(xid, tcon, cifs_sb, from_name, access,
 393                               FILE_OPEN, 0, smb2_to_name, command);
 394 smb2_rename_path:
 395         kfree(smb2_to_name);
 396         return rc;
 397 }
 398
 399 int
 400 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 401                  const char *from_name, const char *to_name,
 402                  struct cifs_sb_info *cifs_sb)
 403 {
 404         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 405                                   DELETE, SMB2_OP_RENAME);
 406 }
 407
 408 int
 409 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 410                      const char *from_name, const char *to_name,
 411                      struct cifs_sb_info *cifs_sb)
 412 {
 413         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 414                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
 415 }
 416
 417 int
 418 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 419                    const char *full_path, __u64 size,
 420                    struct cifs_sb_info *cifs_sb, bool set_alloc)
 421 {
 422         __le64 eof = cpu_to_le64(size);
 423
 424         return smb2_compound_op(xid, tcon, cifs_sb, full_path,
 425                                 FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
 426                                 SMB2_OP_SET_EOF);
 427 }
 428
 429 int
 430 smb2_set_file_info(struct inode *inode, const char *full_path,
 431                    FILE_BASIC_INFO *buf, const unsigned int xid)
 432 {
 433         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 434         struct tcon_link *tlink;
 435         int rc;
 436
 437         if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
 438             (buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
 439             (buf->Attributes == 0))
 440                 return 0; /* would be a no op, no sense sending this */
 441
 442         tlink = cifs_sb_tlink(cifs_sb);
 443         if (IS_ERR(tlink))
 444                 return PTR_ERR(tlink);
 445
 446         rc = smb2_compound_op(xid, tlink_tcon(tlink), cifs_sb, full_path,
 447                               FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, buf,
 448                               SMB2_OP_SET_INFO);
 449         cifs_put_tlink(tlink);
 450         return rc;
 451 }