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 *data, 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 close_iov[1];
  60         struct smb2_query_info_rsp *rsp = NULL;
  61         int flags = 0;
  62
  63         if (smb3_encryption_required(tcon))
  64                 flags |= CIFS_TRANSFORM_REQ;
  65
  66         memset(rqst, 0, sizeof(rqst));
  67         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
  68         memset(rsp_iov, 0, sizeof(rsp_iov));
  69
  70         /* Open */
  71         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
  72         if (!utf16_path)
  73                 return -ENOMEM;
  74
  75         oparms.tcon = tcon;
  76         oparms.desired_access = desired_access;
  77         oparms.disposition = create_disposition;
  78         oparms.create_options = create_options;
  79         oparms.fid = &fid;
  80         oparms.reconnect = false;
  81
  82         memset(&open_iov, 0, sizeof(open_iov));
  83         rqst[num_rqst].rq_iov = open_iov;
  84         rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;
  85         rc = SMB2_open_init(tcon, &rqst[num_rqst], &oplock, &oparms,
  86                             utf16_path);
  87         kfree(utf16_path);
  88         if (rc)
  89                 goto finished;
  90
  91         smb2_set_next_command(server, &rqst[num_rqst++]);
  92
  93         /* Operation */
  94         switch (command) {
  95         case SMB2_OP_QUERY_INFO:
  96                 memset(&qi_iov, 0, sizeof(qi_iov));
  97                 rqst[num_rqst].rq_iov = qi_iov;
  98                 rqst[num_rqst].rq_nvec = 1;
  99
 100                 rc = SMB2_query_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 101                                 COMPOUND_FID, FILE_ALL_INFORMATION,
 102                                 SMB2_O_INFO_FILE, 0,
 103                                 sizeof(struct smb2_file_all_info) +
 104                                           PATH_MAX * 2);
 105                 smb2_set_next_command(server, &rqst[num_rqst]);
 106                 smb2_set_related(&rqst[num_rqst++]);
 107                 break;
 108         default:
 109                 cifs_dbg(VFS, "Invalid command\n");
 110                 rc = -EINVAL;
 111         }
 112         if (rc)
 113                 goto finished;
 114
 115         /* Close */
 116         memset(&close_iov, 0, sizeof(close_iov));
 117         rqst[num_rqst].rq_iov = close_iov;
 118         rqst[num_rqst].rq_nvec = 1;
 119         rc = SMB2_close_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 120                              COMPOUND_FID);
 121         smb2_set_related(&rqst[num_rqst++]);
 122         if (rc)
 123                 goto finished;
 124
 125         rc = compound_send_recv(xid, ses, flags, num_rqst, rqst,
 126                                 resp_buftype, rsp_iov);
 127
 128  finished:
 129         SMB2_open_free(&rqst[0]);
 130         switch (command) {
 131         case SMB2_OP_QUERY_INFO:
 132                 if (rc == 0) {
 133                         rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
 134                         rc = smb2_validate_and_copy_iov(
 135                                 le16_to_cpu(rsp->OutputBufferOffset),
 136                                 le32_to_cpu(rsp->OutputBufferLength),
 137                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
 138                                 data);
 139                 }
 140                 if (rqst[1].rq_iov)
 141                         SMB2_query_info_free(&rqst[1]);
 142                 if (rqst[2].rq_iov)
 143                         SMB2_close_free(&rqst[2]);
 144                 break;
 145         }
 146         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 147         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 148         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
 149         return rc;
 150 }
 151
 152 static int
 153 smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
 154                    struct cifs_sb_info *cifs_sb, const char *full_path,
 155                    __u32 desired_access, __u32 create_disposition,
 156                    __u32 create_options, void *data, int command)
 157 {
 158         int rc, tmprc = 0;
 159         __le16 *utf16_path = NULL;
 160         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 161         struct cifs_open_parms oparms;
 162         struct cifs_fid fid;
 163         bool use_cached_root_handle = false;
 164
 165         if ((strcmp(full_path, "") == 0) && (create_options == 0) &&
 166             (desired_access == FILE_READ_ATTRIBUTES) &&
 167             (create_disposition == FILE_OPEN) &&
 168             (tcon->nohandlecache == false)) {
 169                 rc = open_shroot(xid, tcon, &fid);
 170                 if (rc == 0)
 171                         use_cached_root_handle = true;
 172         }
 173
 174         if (use_cached_root_handle == false) {
 175                 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 176                 if (!utf16_path)
 177                         return -ENOMEM;
 178
 179                 oparms.tcon = tcon;
 180                 oparms.desired_access = desired_access;
 181                 oparms.disposition = create_disposition;
 182                 oparms.create_options = create_options;
 183                 oparms.fid = &fid;
 184                 oparms.reconnect = false;
 185
 186                 rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
 187                                NULL);
 188                 if (rc) {
 189                         kfree(utf16_path);
 190                         return rc;
 191                 }
 192         }
 193
 194         switch (command) {
 195         case SMB2_OP_DELETE:
 196                 break;
 197         case SMB2_OP_MKDIR:
 198                 /*
 199                  * Directories are created through parameters in the
 200                  * SMB2_open() call.
 201                  */
 202                 break;
 203         case SMB2_OP_RMDIR:
 204                 tmprc = SMB2_rmdir(xid, tcon, fid.persistent_fid,
 205                                    fid.volatile_fid);
 206                 break;
 207         case SMB2_OP_RENAME:
 208                 tmprc = SMB2_rename(xid, tcon, fid.persistent_fid,
 209                                     fid.volatile_fid, (__le16 *)data);
 210                 break;
 211         case SMB2_OP_HARDLINK:
 212                 tmprc = SMB2_set_hardlink(xid, tcon, fid.persistent_fid,
 213                                           fid.volatile_fid, (__le16 *)data);
 214                 break;
 215         case SMB2_OP_SET_EOF:
 216                 tmprc = SMB2_set_eof(xid, tcon, fid.persistent_fid,
 217                                      fid.volatile_fid, current->tgid,
 218                                      (__le64 *)data, false);
 219                 break;
 220         case SMB2_OP_SET_INFO:
 221                 tmprc = SMB2_set_info(xid, tcon, fid.persistent_fid,
 222                                       fid.volatile_fid,
 223                                       (FILE_BASIC_INFO *)data);
 224                 break;
 225         default:
 226                 cifs_dbg(VFS, "Invalid command\n");
 227                 break;
 228         }
 229
 230         if (use_cached_root_handle)
 231                 close_shroot(&tcon->crfid);
 232         else
 233                 rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 234         if (tmprc)
 235                 rc = tmprc;
 236         kfree(utf16_path);
 237         return rc;
 238 }
 239
 240 void
 241 move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
 242 {
 243         memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
 244         dst->CurrentByteOffset = src->CurrentByteOffset;
 245         dst->Mode = src->Mode;
 246         dst->AlignmentRequirement = src->AlignmentRequirement;
 247         dst->IndexNumber1 = 0; /* we don't use it */
 248 }
 249
 250 int
 251 smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 252                      struct cifs_sb_info *cifs_sb, const char *full_path,
 253                      FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
 254 {
 255         int rc;
 256         struct smb2_file_all_info *smb2_data;
 257
 258         *adjust_tz = false;
 259         *symlink = false;
 260
 261         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 262                             GFP_KERNEL);
 263         if (smb2_data == NULL)
 264                 return -ENOMEM;
 265
 266         rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 267                               FILE_READ_ATTRIBUTES, FILE_OPEN, 0,
 268                               smb2_data, SMB2_OP_QUERY_INFO);
 269         if (rc == -EOPNOTSUPP) {
 270                 *symlink = true;
 271                 /* Failed on a symbolic link - query a reparse point info */
 272                 rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 273                                       FILE_READ_ATTRIBUTES, FILE_OPEN,
 274                                       OPEN_REPARSE_POINT, smb2_data,
 275                                       SMB2_OP_QUERY_INFO);
 276         }
 277         if (rc)
 278                 goto out;
 279
 280         move_smb2_info_to_cifs(data, smb2_data);
 281 out:
 282         kfree(smb2_data);
 283         return rc;
 284 }
 285
 286 int
 287 smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 288            struct cifs_sb_info *cifs_sb)
 289 {
 290         return smb2_open_op_close(xid, tcon, cifs_sb, name,
 291                                   FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 292                                   CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
 293 }
 294
 295 void
 296 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 297                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 298                    const unsigned int xid)
 299 {
 300         FILE_BASIC_INFO data;
 301         struct cifsInodeInfo *cifs_i;
 302         u32 dosattrs;
 303         int tmprc;
 304
 305         memset(&data, 0, sizeof(data));
 306         cifs_i = CIFS_I(inode);
 307         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 308         data.Attributes = cpu_to_le32(dosattrs);
 309         tmprc = smb2_open_op_close(xid, tcon, cifs_sb, name,
 310                                    FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 311                                    CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
 312         if (tmprc == 0)
 313                 cifs_i->cifsAttrs = dosattrs;
 314 }
 315
 316 int
 317 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 318            struct cifs_sb_info *cifs_sb)
 319 {
 320         return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 321                                   CREATE_NOT_FILE,
 322                                   NULL, SMB2_OP_RMDIR);
 323 }
 324
 325 int
 326 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 327             struct cifs_sb_info *cifs_sb)
 328 {
 329         return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 330                                   CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 331                                   NULL, SMB2_OP_DELETE);
 332 }
 333
 334 static int
 335 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 336                    const char *from_name, const char *to_name,
 337                    struct cifs_sb_info *cifs_sb, __u32 access, int command)
 338 {
 339         __le16 *smb2_to_name = NULL;
 340         int rc;
 341
 342         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 343         if (smb2_to_name == NULL) {
 344                 rc = -ENOMEM;
 345                 goto smb2_rename_path;
 346         }
 347
 348         rc = smb2_open_op_close(xid, tcon, cifs_sb, from_name, access,
 349                                 FILE_OPEN, 0, smb2_to_name, command);
 350 smb2_rename_path:
 351         kfree(smb2_to_name);
 352         return rc;
 353 }
 354
 355 int
 356 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 357                  const char *from_name, const char *to_name,
 358                  struct cifs_sb_info *cifs_sb)
 359 {
 360         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 361                                   DELETE, SMB2_OP_RENAME);
 362 }
 363
 364 int
 365 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 366                      const char *from_name, const char *to_name,
 367                      struct cifs_sb_info *cifs_sb)
 368 {
 369         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 370                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
 371 }
 372
 373 int
 374 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 375                    const char *full_path, __u64 size,
 376                    struct cifs_sb_info *cifs_sb, bool set_alloc)
 377 {
 378         __le64 eof = cpu_to_le64(size);
 379         return smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 380                                   FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
 381                                   SMB2_OP_SET_EOF);
 382 }
 383
 384 int
 385 smb2_set_file_info(struct inode *inode, const char *full_path,
 386                    FILE_BASIC_INFO *buf, const unsigned int xid)
 387 {
 388         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 389         struct tcon_link *tlink;
 390         int rc;
 391
 392         if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
 393             (buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
 394             (buf->Attributes == 0))
 395                 return 0; /* would be a no op, no sense sending this */
 396
 397         tlink = cifs_sb_tlink(cifs_sb);
 398         if (IS_ERR(tlink))
 399                 return PTR_ERR(tlink);
 400
 401         rc = smb2_open_op_close(xid, tlink_tcon(tlink), cifs_sb, full_path,
 402                                 FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, buf,
 403                                 SMB2_OP_SET_INFO);
 404         cifs_put_tlink(tlink);
 405         return rc;
 406 }