fs/orangefs/namei.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * (C) 2001 Clemson University and The University of Chicago
   4  *
   5  * See COPYING in top-level directory.
   6  */
   7
   8 /*
   9  *  Linux VFS namei operations.
  10  */
  11
  12 #include "protocol.h"
  13 #include "orangefs-kernel.h"
  14
  15 /*
  16  * Get a newly allocated inode to go with a negative dentry.
  17  */
  18 static int orangefs_create(struct inode *dir,
  19                         struct dentry *dentry,
  20                         umode_t mode,
  21                         bool exclusive)
  22 {
  23         struct orangefs_inode_s *parent = ORANGEFS_I(dir);
  24         struct orangefs_kernel_op_s *new_op;
  25         struct orangefs_object_kref ref;
  26         struct inode *inode;
  27         struct iattr iattr;
  28         int ret;
  29
  30         gossip_debug(GOSSIP_NAME_DEBUG, "%s: %pd\n",
  31                      __func__,
  32                      dentry);
  33
  34         new_op = op_alloc(ORANGEFS_VFS_OP_CREATE);
  35         if (!new_op)
  36                 return -ENOMEM;
  37
  38         new_op->upcall.req.create.parent_refn = parent->refn;
  39
  40         fill_default_sys_attrs(new_op->upcall.req.create.attributes,
  41                                ORANGEFS_TYPE_METAFILE, mode);
  42
  43         strncpy(new_op->upcall.req.create.d_name,
  44                 dentry->d_name.name, ORANGEFS_NAME_MAX);
  45
  46         ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
  47
  48         gossip_debug(GOSSIP_NAME_DEBUG,
  49                      "%s: %pd: handle:%pU: fsid:%d: new_op:%p: ret:%d:\n",
  50                      __func__,
  51                      dentry,
  52                      &new_op->downcall.resp.create.refn.khandle,
  53                      new_op->downcall.resp.create.refn.fs_id,
  54                      new_op,
  55                      ret);
  56
  57         if (ret < 0)
  58                 goto out;
  59
  60         ref = new_op->downcall.resp.create.refn;
  61         op_release(new_op);
  62
  63         inode = orangefs_new_inode(dir->i_sb, dir, S_IFREG | mode, 0, &ref);
  64         if (IS_ERR(inode)) {
  65                 gossip_err("%s: Failed to allocate inode for file :%pd:\n",
  66                            __func__,
  67                            dentry);
  68                 ret = PTR_ERR(inode);
  69                 goto out;
  70         }
  71
  72         gossip_debug(GOSSIP_NAME_DEBUG,
  73                      "%s: Assigned inode :%pU: for file :%pd:\n",
  74                      __func__,
  75                      get_khandle_from_ino(inode),
  76                      dentry);
  77
  78         d_instantiate(dentry, inode);
  79         unlock_new_inode(inode);
  80         orangefs_set_timeout(dentry);
  81         ORANGEFS_I(inode)->getattr_time = jiffies - 1;
  82         ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
  83
  84         gossip_debug(GOSSIP_NAME_DEBUG,
  85                      "%s: dentry instantiated for %pd\n",
  86                      __func__,
  87                      dentry);
  88
  89         dir->i_mtime = dir->i_ctime = current_time(dir);
  90         memset(&iattr, 0, sizeof iattr);
  91         iattr.ia_valid |= ATTR_MTIME;
  92         orangefs_inode_setattr(dir, &iattr);
  93         mark_inode_dirty_sync(dir);
  94         ret = 0;
  95 out:
  96         gossip_debug(GOSSIP_NAME_DEBUG,
  97                      "%s: %pd: returning %d\n",
  98                      __func__,
  99                      dentry,
 100                      ret);
 101         return ret;
 102 }
 103
 104 /*
 105  * Attempt to resolve an object name (dentry->d_name), parent handle, and
 106  * fsid into a handle for the object.
 107  */
 108 static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
 109                                    unsigned int flags)
 110 {
 111         struct orangefs_inode_s *parent = ORANGEFS_I(dir);
 112         struct orangefs_kernel_op_s *new_op;
 113         struct inode *inode;
 114         struct dentry *res;
 115         int ret = -EINVAL;
 116
 117         /*
 118          * in theory we could skip a lookup here (if the intent is to
 119          * create) in order to avoid a potentially failed lookup, but
 120          * leaving it in can skip a valid lookup and try to create a file
 121          * that already exists (e.g. the vfs already handles checking for
 122          * -EEXIST on O_EXCL opens, which is broken if we skip this lookup
 123          * in the create path)
 124          */
 125         gossip_debug(GOSSIP_NAME_DEBUG, "%s called on %pd\n",
 126                      __func__, dentry);
 127
 128         if (dentry->d_name.len > (ORANGEFS_NAME_MAX - 1))
 129                 return ERR_PTR(-ENAMETOOLONG);
 130
 131         new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
 132         if (!new_op)
 133                 return ERR_PTR(-ENOMEM);
 134
 135         new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
 136
 137         gossip_debug(GOSSIP_NAME_DEBUG, "%s:%s:%d using parent %pU\n",
 138                      __FILE__,
 139                      __func__,
 140                      __LINE__,
 141                      &parent->refn.khandle);
 142         new_op->upcall.req.lookup.parent_refn = parent->refn;
 143
 144         strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name,
 145                 ORANGEFS_NAME_MAX);
 146
 147         gossip_debug(GOSSIP_NAME_DEBUG,
 148                      "%s: doing lookup on %s under %pU,%d\n",
 149                      __func__,
 150                      new_op->upcall.req.lookup.d_name,
 151                      &new_op->upcall.req.lookup.parent_refn.khandle,
 152                      new_op->upcall.req.lookup.parent_refn.fs_id);
 153
 154         ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
 155
 156         gossip_debug(GOSSIP_NAME_DEBUG,
 157                      "Lookup Got %pU, fsid %d (ret=%d)\n",
 158                      &new_op->downcall.resp.lookup.refn.khandle,
 159                      new_op->downcall.resp.lookup.refn.fs_id,
 160                      ret);
 161
 162         if (ret < 0) {
 163                 if (ret == -ENOENT) {
 164                         /*
 165                          * if no inode was found, add a negative dentry to
 166                          * dcache anyway; if we don't, we don't hold expected
 167                          * lookup semantics and we most noticeably break
 168                          * during directory renames.
 169                          *
 170                          * however, if the operation failed or exited, do not
 171                          * add the dentry (e.g. in the case that a touch is
 172                          * issued on a file that already exists that was
 173                          * interrupted during this lookup -- no need to add
 174                          * another negative dentry for an existing file)
 175                          */
 176
 177                         gossip_debug(GOSSIP_NAME_DEBUG,
 178                                      "orangefs_lookup: Adding *negative* dentry "
 179                                      "%p for %pd\n",
 180                                      dentry,
 181                                      dentry);
 182
 183                         d_add(dentry, NULL);
 184                         res = NULL;
 185                         goto out;
 186                 }
 187
 188                 /* must be a non-recoverable error */
 189                 res = ERR_PTR(ret);
 190                 goto out;
 191         }
 192
 193         orangefs_set_timeout(dentry);
 194
 195         inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn);
 196         if (IS_ERR(inode)) {
 197                 gossip_debug(GOSSIP_NAME_DEBUG,
 198                         "error %ld from iget\n", PTR_ERR(inode));
 199                 res = ERR_CAST(inode);
 200                 goto out;
 201         }
 202
 203         gossip_debug(GOSSIP_NAME_DEBUG,
 204                      "%s:%s:%d "
 205                      "Found good inode [%lu] with count [%d]\n",
 206                      __FILE__,
 207                      __func__,
 208                      __LINE__,
 209                      inode->i_ino,
 210                      (int)atomic_read(&inode->i_count));
 211
 212         /* update dentry/inode pair into dcache */
 213         res = d_splice_alias(inode, dentry);
 214
 215         gossip_debug(GOSSIP_NAME_DEBUG,
 216                      "Lookup success (inode ct = %d)\n",
 217                      (int)atomic_read(&inode->i_count));
 218 out:
 219         op_release(new_op);
 220         return res;
 221 }
 222
 223 /* return 0 on success; non-zero otherwise */
 224 static int orangefs_unlink(struct inode *dir, struct dentry *dentry)
 225 {
 226         struct inode *inode = dentry->d_inode;
 227         struct orangefs_inode_s *parent = ORANGEFS_I(dir);
 228         struct orangefs_kernel_op_s *new_op;
 229         struct iattr iattr;
 230         int ret;
 231
 232         gossip_debug(GOSSIP_NAME_DEBUG,
 233                      "%s: called on %pd\n"
 234                      "  (inode %pU): Parent is %pU | fs_id %d\n",
 235                      __func__,
 236                      dentry,
 237                      get_khandle_from_ino(inode),
 238                      &parent->refn.khandle,
 239                      parent->refn.fs_id);
 240
 241         new_op = op_alloc(ORANGEFS_VFS_OP_REMOVE);
 242         if (!new_op)
 243                 return -ENOMEM;
 244
 245         new_op->upcall.req.remove.parent_refn = parent->refn;
 246         strncpy(new_op->upcall.req.remove.d_name, dentry->d_name.name,
 247                 ORANGEFS_NAME_MAX);
 248
 249         ret = service_operation(new_op, "orangefs_unlink",
 250                                 get_interruptible_flag(inode));
 251
 252         gossip_debug(GOSSIP_NAME_DEBUG,
 253                      "%s: service_operation returned:%d:\n",
 254                      __func__,
 255                      ret);
 256
 257         op_release(new_op);
 258
 259         if (!ret) {
 260                 drop_nlink(inode);
 261
 262                 dir->i_mtime = dir->i_ctime = current_time(dir);
 263                 memset(&iattr, 0, sizeof iattr);
 264                 iattr.ia_valid |= ATTR_MTIME;
 265                 orangefs_inode_setattr(dir, &iattr);
 266                 mark_inode_dirty_sync(dir);
 267         }
 268         return ret;
 269 }
 270
 271 static int orangefs_symlink(struct inode *dir,
 272                          struct dentry *dentry,
 273                          const char *symname)
 274 {
 275         struct orangefs_inode_s *parent = ORANGEFS_I(dir);
 276         struct orangefs_kernel_op_s *new_op;
 277         struct orangefs_object_kref ref;
 278         struct inode *inode;
 279         struct iattr iattr;
 280         int mode = 755;
 281         int ret;
 282
 283         gossip_debug(GOSSIP_NAME_DEBUG, "%s: called\n", __func__);
 284
 285         if (!symname)
 286                 return -EINVAL;
 287
 288         if (strlen(symname)+1 > ORANGEFS_NAME_MAX)
 289                 return -ENAMETOOLONG;
 290
 291         new_op = op_alloc(ORANGEFS_VFS_OP_SYMLINK);
 292         if (!new_op)
 293                 return -ENOMEM;
 294
 295         new_op->upcall.req.sym.parent_refn = parent->refn;
 296
 297         fill_default_sys_attrs(new_op->upcall.req.sym.attributes,
 298                                ORANGEFS_TYPE_SYMLINK,
 299                                mode);
 300
 301         strncpy(new_op->upcall.req.sym.entry_name,
 302                 dentry->d_name.name,
 303                 ORANGEFS_NAME_MAX);
 304         strncpy(new_op->upcall.req.sym.target, symname, ORANGEFS_NAME_MAX);
 305
 306         ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
 307
 308         gossip_debug(GOSSIP_NAME_DEBUG,
 309                      "Symlink Got ORANGEFS handle %pU on fsid %d (ret=%d)\n",
 310                      &new_op->downcall.resp.sym.refn.khandle,
 311                      new_op->downcall.resp.sym.refn.fs_id, ret);
 312
 313         if (ret < 0) {
 314                 gossip_debug(GOSSIP_NAME_DEBUG,
 315                             "%s: failed with error code %d\n",
 316                             __func__, ret);
 317                 goto out;
 318         }
 319
 320         ref = new_op->downcall.resp.sym.refn;
 321         op_release(new_op);
 322
 323         inode = orangefs_new_inode(dir->i_sb, dir, S_IFLNK | mode, 0, &ref);
 324         if (IS_ERR(inode)) {
 325                 gossip_err
 326                     ("*** Failed to allocate orangefs symlink inode\n");
 327                 ret = PTR_ERR(inode);
 328                 goto out;
 329         }
 330
 331         gossip_debug(GOSSIP_NAME_DEBUG,
 332                      "Assigned symlink inode new number of %pU\n",
 333                      get_khandle_from_ino(inode));
 334
 335         d_instantiate(dentry, inode);
 336         unlock_new_inode(inode);
 337         orangefs_set_timeout(dentry);
 338         ORANGEFS_I(inode)->getattr_time = jiffies - 1;
 339         ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
 340
 341         gossip_debug(GOSSIP_NAME_DEBUG,
 342                      "Inode (Symlink) %pU -> %pd\n",
 343                      get_khandle_from_ino(inode),
 344                      dentry);
 345
 346         dir->i_mtime = dir->i_ctime = current_time(dir);
 347         memset(&iattr, 0, sizeof iattr);
 348         iattr.ia_valid |= ATTR_MTIME;
 349         orangefs_inode_setattr(dir, &iattr);
 350         mark_inode_dirty_sync(dir);
 351         ret = 0;
 352 out:
 353         return ret;
 354 }
 355
 356 static int orangefs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 357 {
 358         struct orangefs_inode_s *parent = ORANGEFS_I(dir);
 359         struct orangefs_kernel_op_s *new_op;
 360         struct orangefs_object_kref ref;
 361         struct inode *inode;
 362         struct iattr iattr;
 363         int ret;
 364
 365         new_op = op_alloc(ORANGEFS_VFS_OP_MKDIR);
 366         if (!new_op)
 367                 return -ENOMEM;
 368
 369         new_op->upcall.req.mkdir.parent_refn = parent->refn;
 370
 371         fill_default_sys_attrs(new_op->upcall.req.mkdir.attributes,
 372                               ORANGEFS_TYPE_DIRECTORY, mode);
 373
 374         strncpy(new_op->upcall.req.mkdir.d_name,
 375                 dentry->d_name.name, ORANGEFS_NAME_MAX);
 376
 377         ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
 378
 379         gossip_debug(GOSSIP_NAME_DEBUG,
 380                      "Mkdir Got ORANGEFS handle %pU on fsid %d\n",
 381                      &new_op->downcall.resp.mkdir.refn.khandle,
 382                      new_op->downcall.resp.mkdir.refn.fs_id);
 383
 384         if (ret < 0) {
 385                 gossip_debug(GOSSIP_NAME_DEBUG,
 386                              "%s: failed with error code %d\n",
 387                              __func__, ret);
 388                 goto out;
 389         }
 390
 391         ref = new_op->downcall.resp.mkdir.refn;
 392         op_release(new_op);
 393
 394         inode = orangefs_new_inode(dir->i_sb, dir, S_IFDIR | mode, 0, &ref);
 395         if (IS_ERR(inode)) {
 396                 gossip_err("*** Failed to allocate orangefs dir inode\n");
 397                 ret = PTR_ERR(inode);
 398                 goto out;
 399         }
 400
 401         gossip_debug(GOSSIP_NAME_DEBUG,
 402                      "Assigned dir inode new number of %pU\n",
 403                      get_khandle_from_ino(inode));
 404
 405         d_instantiate(dentry, inode);
 406         unlock_new_inode(inode);
 407         orangefs_set_timeout(dentry);
 408         ORANGEFS_I(inode)->getattr_time = jiffies - 1;
 409         ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
 410
 411         gossip_debug(GOSSIP_NAME_DEBUG,
 412                      "Inode (Directory) %pU -> %pd\n",
 413                      get_khandle_from_ino(inode),
 414                      dentry);
 415
 416         /*
 417          * NOTE: we have no good way to keep nlink consistent for directories
 418          * across clients; keep constant at 1.
 419          */
 420         dir->i_mtime = dir->i_ctime = current_time(dir);
 421         memset(&iattr, 0, sizeof iattr);
 422         iattr.ia_valid |= ATTR_MTIME;
 423         orangefs_inode_setattr(dir, &iattr);
 424         mark_inode_dirty_sync(dir);
 425 out:
 426         return ret;
 427 }
 428
 429 static int orangefs_rename(struct inode *old_dir,
 430                         struct dentry *old_dentry,
 431                         struct inode *new_dir,
 432                         struct dentry *new_dentry,
 433                         unsigned int flags)
 434 {
 435         struct orangefs_kernel_op_s *new_op;
 436         int ret;
 437
 438         if (flags)
 439                 return -EINVAL;
 440
 441         gossip_debug(GOSSIP_NAME_DEBUG,
 442                      "orangefs_rename: called (%pd2 => %pd2) ct=%d\n",
 443                      old_dentry, new_dentry, d_count(new_dentry));
 444
 445         ORANGEFS_I(new_dentry->d_parent->d_inode)->getattr_time = jiffies - 1;
 446
 447         new_op = op_alloc(ORANGEFS_VFS_OP_RENAME);
 448         if (!new_op)
 449                 return -EINVAL;
 450
 451         new_op->upcall.req.rename.old_parent_refn = ORANGEFS_I(old_dir)->refn;
 452         new_op->upcall.req.rename.new_parent_refn = ORANGEFS_I(new_dir)->refn;
 453
 454         strncpy(new_op->upcall.req.rename.d_old_name,
 455                 old_dentry->d_name.name,
 456                 ORANGEFS_NAME_MAX);
 457         strncpy(new_op->upcall.req.rename.d_new_name,
 458                 new_dentry->d_name.name,
 459                 ORANGEFS_NAME_MAX);
 460
 461         ret = service_operation(new_op,
 462                                 "orangefs_rename",
 463                                 get_interruptible_flag(old_dentry->d_inode));
 464
 465         gossip_debug(GOSSIP_NAME_DEBUG,
 466                      "orangefs_rename: got downcall status %d\n",
 467                      ret);
 468
 469         if (new_dentry->d_inode)
 470                 new_dentry->d_inode->i_ctime = current_time(new_dentry->d_inode);
 471
 472         op_release(new_op);
 473         return ret;
 474 }
 475
 476 /* ORANGEFS implementation of VFS inode operations for directories */
 477 const struct inode_operations orangefs_dir_inode_operations = {
 478         .lookup = orangefs_lookup,
 479         .get_acl = orangefs_get_acl,
 480         .set_acl = orangefs_set_acl,
 481         .create = orangefs_create,
 482         .unlink = orangefs_unlink,
 483         .symlink = orangefs_symlink,
 484         .mkdir = orangefs_mkdir,
 485         .rmdir = orangefs_unlink,
 486         .rename = orangefs_rename,
 487         .setattr = orangefs_setattr,
 488         .getattr = orangefs_getattr,
 489         .listxattr = orangefs_listxattr,
 490         .permission = orangefs_permission,
 491         .update_time = orangefs_update_time,
 492 };