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