fs/orangefs/namei.c

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