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