lustre/smfs/dir.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2004 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #define DEBUG_SUBSYSTEM S_SM
  24
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/string.h>
  28 #include <linux/slab.h>
  29 #include <linux/stat.h>
  30 #include <linux/unistd.h>
  31 #include <linux/smp_lock.h>
  32 #include <linux/obd_class.h>
  33 #include <linux/obd_support.h>
  34 #include <linux/lustre_lib.h>
  35 #include <linux/lustre_idl.h>
  36 #include <linux/lustre_fsfilt.h>
  37 #include <linux/lustre_smfs.h>
  38
  39 #include "smfs_internal.h"
  40
  41 #define NAME_ALLOC_LEN(len)     ((len+16) & ~15)
  42
  43 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  44 static int smfs_create(struct inode *dir, struct dentry *dentry,
  45                        int mode)
  46 #else
  47 static int smfs_create(struct inode *dir, struct dentry *dentry,
  48                        int mode, struct nameidata *nd)
  49 #endif
  50 {
  51         struct inode  *inode = NULL;
  52         struct inode  *cache_dir = NULL;
  53         struct dentry *cache_dentry = NULL;
  54         struct dentry *cache_parent = NULL;
  55         void *handle = NULL;
  56         int rc = 0;
  57
  58         ENTRY;
  59
  60         cache_dir = I2CI(dir);
  61         if (!cache_dir)
  62                 RETURN(-ENOENT);
  63
  64         handle = smfs_trans_start(dir, FSFILT_OP_CREATE, NULL);
  65         if (IS_ERR(handle))
  66                        RETURN(-ENOSPC);
  67
  68         SMFS_CACHE_HOOK_PRE(CACHE_HOOK_CREATE, handle, dir);
  69
  70         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
  71         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
  72
  73         lock_kernel();
  74         if (!cache_dentry || !cache_parent)
  75                 GOTO(exit, rc = -ENOMEM);
  76
  77         pre_smfs_inode(dir, cache_dir);
  78
  79         SMFS_PRE_COW(dir, dentry, REINT_CREATE, "create", rc, exit);
  80
  81 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  82         if (cache_dir && cache_dir->i_op->create)
  83                 rc = cache_dir->i_op->create(cache_dir, cache_dentry,
  84                                              mode);
  85 #else
  86         if (cache_dir && cache_dir->i_op->create)
  87                 rc = cache_dir->i_op->create(cache_dir, cache_dentry,
  88                                              mode, nd);
  89 #endif
  90         if (rc)
  91                 GOTO(exit, rc);
  92
  93         inode = iget4(dir->i_sb, cache_dentry->d_inode->i_ino, NULL,
  94                       &I2SMI(dir)->smi_flags);
  95         if (!inode)
  96                 GOTO(exit, rc = -ENOMEM);
  97
  98         d_instantiate(dentry, inode);
  99         sm_set_inode_ops(cache_dentry->d_inode, inode);
 100         post_smfs_inode(dir, cache_dir);
 101
 102         /*Do KML post hook*/
 103
 104         SMFS_KML_POST(dir, dentry, NULL, NULL, REINT_CREATE,
 105                       "create", rc, exit);
 106         SMFS_CACHE_HOOK_POST(CACHE_HOOK_CREATE, handle, dir, dentry,
 107                              NULL, NULL, rc, exit);
 108 exit:
 109         unlock_kernel();
 110         post_smfs_dentry(cache_dentry);
 111         post_smfs_dentry(cache_parent);
 112         smfs_trans_commit(dir, handle, 0);
 113         RETURN(rc);
 114 }
 115
 116 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 117 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry)
 118 #else
 119 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry,
 120                                   struct nameidata *nd)
 121 #endif
 122 {
 123         struct inode *cache_dir;
 124         struct inode *cache_inode;
 125         struct inode *inode = NULL;
 126         struct dentry *cache_dentry = NULL;
 127         struct dentry *cache_parent = NULL;
 128         struct dentry *rc = NULL;
 129         void *handle = NULL;
 130         int rc2 = 0;
 131
 132         ENTRY;
 133
 134         if (!(cache_dir = I2CI(dir)))
 135                 RETURN(ERR_PTR(-ENOENT));
 136
 137         handle = smfs_trans_start(dir, KML_CACHE_NOOP, NULL);
 138         if (IS_ERR(handle))
 139                 RETURN(ERR_PTR(-ENOSPC));
 140
 141         SMFS_CACHE_HOOK_PRE(CACHE_HOOK_LOOKUP, handle, dir);
 142
 143         /* preparing artificial backing fs dentries. */
 144         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry->d_parent);
 145         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 146
 147         if (!cache_dentry || !cache_parent)
 148                 GOTO(exit, rc = ERR_PTR(-ENOMEM));
 149
 150         if (!cache_dir && cache_dir->i_op->lookup)
 151                 GOTO(exit, rc = ERR_PTR(-ENOENT));
 152
 153         /* perform lookup in backing fs. */
 154 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 155         rc = cache_dir->i_op->lookup(cache_dir, cache_dentry);
 156 #else
 157         rc = cache_dir->i_op->lookup(cache_dir, cache_dentry, nd);
 158 #endif
 159
 160         if (rc && IS_ERR(rc))
 161                 GOTO(exit, rc);
 162
 163         if ((cache_inode = rc ? rc->d_inode : cache_dentry->d_inode)) {
 164                 if (IS_ERR(cache_inode)) {
 165                         dentry->d_inode = cache_inode;
 166                         GOTO(exit, rc = NULL);
 167                 }
 168                 inode = iget4(dir->i_sb, cache_inode->i_ino, NULL,
 169                                     &I2SMI(dir)->smi_flags);
 170         } else {
 171                 d_add(dentry, NULL);
 172                 GOTO(exit, rc);
 173         }
 174
 175         d_add(dentry, inode);
 176         rc = NULL;
 177
 178         SMFS_CACHE_HOOK_POST(CACHE_HOOK_LOOKUP, handle, dir, dentry,
 179                              NULL, NULL, rc2, exit);
 180 exit:
 181         if (rc2)
 182                 rc = ERR_PTR(rc2);
 183         post_smfs_dentry(cache_dentry);
 184         post_smfs_dentry(cache_parent);
 185         smfs_trans_commit(dir, handle, 0);
 186         RETURN(rc);
 187 }
 188
 189 static int smfs_link(struct dentry * old_dentry,
 190                      struct inode * dir, struct dentry *dentry)
 191 {
 192         struct        inode *cache_old_inode = NULL;
 193         struct        inode *cache_dir = I2CI(dir);
 194         struct        inode *inode = NULL;
 195         struct  dentry *cache_dentry = NULL;
 196         struct  dentry *cache_old_dentry = NULL;
 197         struct  dentry *cache_parent = NULL;
 198         void        *handle = NULL;
 199         int        rc = 0;
 200
 201         inode = old_dentry->d_inode;
 202
 203         cache_old_inode = I2CI(inode);
 204
 205         handle = smfs_trans_start(dir, FSFILT_OP_LINK, NULL);
 206         if (IS_ERR(handle))
 207                        RETURN(-ENOSPC);
 208
 209         SMFS_CACHE_HOOK_PRE(CACHE_HOOK_LINK, handle, dir);
 210
 211         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
 212         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 213
 214         lock_kernel();
 215         if (!cache_parent || !cache_dentry)
 216                 GOTO(exit, rc = -ENOMEM);
 217
 218         cache_old_dentry = pre_smfs_dentry(NULL, cache_old_inode,
 219                                            old_dentry);
 220         if (!cache_old_dentry)
 221                 GOTO(exit, rc = -ENOMEM);
 222
 223         pre_smfs_inode(dir, cache_dir);
 224         pre_smfs_inode(inode, cache_old_dentry->d_inode);
 225
 226         if (cache_dir->i_op->link)
 227                 rc = cache_dir->i_op->link(cache_old_dentry, cache_dir,
 228                                            cache_dentry);
 229         if (rc)
 230                 GOTO(exit, rc);
 231
 232         atomic_inc(&inode->i_count);
 233         post_smfs_inode(inode, cache_old_dentry->d_inode);
 234         d_instantiate(dentry, inode);
 235         post_smfs_inode(dir, cache_dir);
 236
 237         SMFS_KML_POST(dir, old_dentry, dentry, NULL,
 238                       REINT_LINK, "link", rc, exit);
 239
 240         SMFS_CACHE_HOOK_POST(CACHE_HOOK_LINK, handle,
 241                              dir, old_dentry, NULL, NULL, rc, exit);
 242 exit:
 243         unlock_kernel();
 244         post_smfs_dentry(cache_dentry);
 245         post_smfs_dentry(cache_parent);
 246         post_smfs_dentry(cache_old_dentry);
 247         smfs_trans_commit(dir, handle, 0);
 248         RETURN(rc);
 249 }
 250
 251 static int smfs_unlink(struct inode * dir,
 252                        struct dentry *dentry)
 253 {
 254         struct inode *cache_dir = I2CI(dir);
 255         struct inode *cache_inode = I2CI(dentry->d_inode);
 256         struct dentry *cache_dentry;
 257         struct dentry *cache_parent;
 258         void   *handle = NULL;
 259         int    rc = 0;
 260         int    mode = 0;
 261
 262         if (!cache_dir || !cache_inode)
 263                 RETURN(-ENOENT);
 264
 265         handle = smfs_trans_start(dir, FSFILT_OP_UNLINK, NULL);
 266         if (IS_ERR(handle))
 267                 RETURN(-ENOSPC);
 268
 269         SMFS_CACHE_HOOK_PRE(CACHE_HOOK_UNLINK, handle, dir);
 270
 271         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
 272         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 273
 274         if (!cache_parent || !cache_dentry)
 275                 GOTO(exit, rc = -ENOMEM);
 276
 277         lock_kernel();
 278         pre_smfs_inode(dir, cache_dir);
 279         pre_smfs_inode(dentry->d_inode, cache_inode);
 280         if (cache_dir->i_op->unlink)
 281                 rc = cache_dir->i_op->unlink(cache_dir, cache_dentry);
 282         post_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 283         post_smfs_inode(dir, cache_dir);
 284         unlock_kernel();
 285         SMFS_KML_POST(dir, dentry, &mode, NULL, REINT_UNLINK,
 286                       "unlink", rc, exit);
 287
 288         SMFS_CACHE_HOOK_POST(CACHE_HOOK_UNLINK, handle, dir, dentry,
 289                              NULL, NULL, rc, exit);
 290 exit:
 291         post_smfs_dentry(cache_dentry);
 292         post_smfs_dentry(cache_parent);
 293         smfs_trans_commit(dir, handle, 0);
 294         RETURN(rc);
 295 }
 296
 297 static int smfs_symlink(struct inode *dir, struct dentry *dentry,
 298                         const char *symname)
 299 {
 300         struct inode *cache_dir = I2CI(dir);
 301         struct inode *inode = NULL;
 302         struct dentry *cache_dentry;
 303         struct dentry *cache_parent;
 304         void   *handle = NULL;
 305         int    rc = 0, tgt_len;
 306
 307         if (!cache_dir)
 308                 RETURN(-ENOENT);
 309
 310         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
 311         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 312
 313         if (!cache_parent || !cache_dentry)
 314                 GOTO(exit, rc = -ENOMEM);
 315
 316         handle = smfs_trans_start(dir, FSFILT_OP_SYMLINK, NULL);
 317         if (IS_ERR(handle))
 318                 RETURN(-ENOSPC);
 319
 320         SMFS_CACHE_HOOK_PRE(CACHE_HOOK_SYMLINK, handle, dir);
 321
 322         pre_smfs_inode(dir, cache_dir);
 323         lock_kernel();
 324         if (cache_dir->i_op->symlink)
 325                 rc = cache_dir->i_op->symlink(cache_dir, cache_dentry, symname);
 326
 327         inode = iget4(dir->i_sb, cache_dentry->d_inode->i_ino, NULL,
 328                       &I2SMI(dir)->smi_flags);
 329         post_smfs_inode(dir, cache_dir);
 330         if (inode)
 331                 d_instantiate(dentry, inode);
 332         else
 333                 rc = -ENOENT;
 334
 335         tgt_len = strlen(symname) + 1;
 336         SMFS_KML_POST(dir, dentry, (char*)symname, &tgt_len, REINT_CREATE,
 337                       "symlink", rc, exit);
 338
 339         SMFS_CACHE_HOOK_POST(CACHE_HOOK_SYMLINK, handle, dir, dentry,
 340                              NULL, NULL, rc, exit);
 341 exit:
 342         unlock_kernel();
 343         post_smfs_dentry(cache_dentry);
 344         post_smfs_dentry(cache_parent);
 345         smfs_trans_commit(dir, handle, 0);
 346         RETURN(rc);
 347 }
 348
 349 static int smfs_mkdir(struct inode *dir, struct dentry *dentry,
 350                       int mode)
 351 {
 352         struct inode *cache_dir = I2CI(dir);
 353         struct inode *inode = NULL;
 354         struct dentry *cache_dentry;
 355         struct dentry *cache_parent;
 356         void   *handle = NULL;
 357         int    rc = 0;
 358
 359         if (!cache_dir)
 360                 RETURN(-ENOENT);
 361
 362         handle = smfs_trans_start(dir, FSFILT_OP_MKDIR, NULL);
 363         if (IS_ERR(handle))
 364                 RETURN(-ENOSPC);
 365
 366         SMFS_CACHE_HOOK_PRE(CACHE_HOOK_MKDIR, handle, dir);
 367
 368         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
 369         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 370
 371         lock_kernel();
 372         if (!cache_parent || !cache_dentry)
 373                 GOTO(exit, rc = -ENOMEM);
 374
 375         pre_smfs_inode(dir, cache_dir);
 376
 377         if (cache_dir->i_op->mkdir)
 378                 rc = cache_dir->i_op->mkdir(cache_dir, cache_dentry, mode);
 379
 380         if (rc)
 381                 GOTO(exit, rc);
 382
 383         inode = iget4(dir->i_sb, cache_dentry->d_inode->i_ino, NULL,
 384                       &I2SMI(dir)->smi_flags);
 385         if (!inode)
 386                 GOTO(exit, rc = -ENOENT);
 387
 388         d_instantiate(dentry, inode);
 389         post_smfs_inode(dir, cache_dir);
 390
 391         SMFS_KML_POST(dir, dentry, NULL, NULL,
 392                       REINT_CREATE, "mkdir", rc, exit);
 393
 394         SMFS_CACHE_HOOK_POST(CACHE_HOOK_MKDIR, handle,
 395                              dir, dentry, NULL, NULL, rc, exit);
 396 exit:
 397         unlock_kernel();
 398         post_smfs_dentry(cache_dentry);
 399         post_smfs_dentry(cache_parent);
 400         smfs_trans_commit(dir, handle, 0);
 401         RETURN(rc);
 402 }
 403
 404 static int smfs_rmdir(struct inode *dir, struct dentry *dentry)
 405 {
 406         struct inode *cache_dir = I2CI(dir);
 407         struct inode *cache_inode = I2CI(dentry->d_inode);
 408         struct dentry *cache_dentry = NULL;
 409         struct dentry *cache_parent = NULL;
 410         void *handle = NULL;
 411         int    rc = 0, mode = S_IFDIR;
 412
 413         if (!cache_dir)
 414                 RETURN(-ENOENT);
 415
 416         handle = smfs_trans_start(dir, FSFILT_OP_RMDIR, NULL);
 417         if (IS_ERR(handle) ) {
 418                 CERROR("smfs_do_mkdir: no space for transaction\n");
 419                 RETURN(-ENOSPC);
 420         }
 421
 422         SMFS_CACHE_HOOK_PRE(CACHE_HOOK_RMDIR, handle, dir);
 423
 424         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
 425         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 426
 427         lock_kernel();
 428         if (!cache_parent || !cache_dentry)
 429                 GOTO(exit, rc = -ENOMEM);
 430
 431         pre_smfs_inode(dir, cache_dir);
 432         pre_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 433         if (cache_dir->i_op->rmdir)
 434                 rc = cache_dir->i_op->rmdir(cache_dir, cache_dentry);
 435
 436         post_smfs_inode(dir, cache_dir);
 437         post_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 438         unlock_kernel();
 439
 440         SMFS_KML_POST(dir, dentry, &mode, NULL,
 441                       REINT_UNLINK, "rmdir", rc, exit);
 442
 443         SMFS_CACHE_HOOK_POST(CACHE_HOOK_RMDIR, handle, dir, dentry,
 444                              NULL, NULL, rc, exit);
 445 exit:
 446         post_smfs_dentry(cache_dentry);
 447         post_smfs_dentry(cache_parent);
 448         smfs_trans_commit(dir, handle, 0);
 449         RETURN(rc);
 450 }
 451
 452 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 453 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 454                       int mode, int rdev)
 455 #else
 456 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 457                       int mode, dev_t rdev)
 458 #endif
 459 {
 460         struct inode *cache_dir = I2CI(dir);
 461         struct inode *inode = NULL;
 462         struct dentry *cache_dentry = NULL;
 463         struct dentry *cache_parent = NULL;
 464         void *handle = NULL;
 465         int rc = 0;
 466
 467         if (!cache_dir)
 468                 RETURN(-ENOENT);
 469
 470         handle = smfs_trans_start(dir, FSFILT_OP_MKNOD, NULL);
 471         if (IS_ERR(handle)) {
 472                 CERROR("smfs_do_mkdir: no space for transaction\n");
 473                 RETURN(-ENOSPC);
 474         }
 475         SMFS_CACHE_HOOK_PRE(CACHE_HOOK_MKNOD, handle, dir);
 476
 477         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry->d_parent);
 478         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 479         lock_kernel();
 480         if (!cache_parent || !cache_dentry)
 481                 GOTO(exit, rc = -ENOMEM);
 482
 483         pre_smfs_inode(dir, cache_dir);
 484         pre_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 485
 486         if (!cache_dir->i_op->mknod)
 487                 RETURN(-ENOENT);
 488
 489         if ((rc = cache_dir->i_op->mknod(cache_dir, cache_dentry,
 490                                          mode, rdev)))
 491                 GOTO(exit, rc);
 492
 493         inode = iget4(dir->i_sb, cache_dentry->d_inode->i_ino, NULL,
 494                       &I2SMI(dir)->smi_flags);
 495         d_instantiate(dentry, inode);
 496
 497         pre_smfs_inode(dir, cache_dir);
 498         pre_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 499
 500         SMFS_KML_POST(dir, dentry, NULL, NULL,
 501                       REINT_CREATE, "mknod", rc, exit);
 502
 503         SMFS_CACHE_HOOK_POST(CACHE_HOOK_MKNOD, handle, dir,
 504                              dentry, NULL, NULL, rc, exit);
 505 exit:
 506         unlock_kernel();
 507         post_smfs_dentry(cache_dentry);
 508         post_smfs_dentry(cache_parent);
 509         smfs_trans_commit(dir, handle, 0);
 510         RETURN(rc);
 511 }
 512
 513 static int smfs_rename(struct inode * old_dir, struct dentry *old_dentry,
 514                        struct inode * new_dir,struct dentry *new_dentry)
 515 {
 516         struct inode *cache_old_dir = I2CI(old_dir);
 517         struct inode *cache_new_dir = I2CI(new_dir);
 518         struct inode *cache_old_inode = I2CI(old_dentry->d_inode);
 519
 520         struct inode *cache_new_inode = new_dentry->d_inode ?
 521             I2CI(new_dentry->d_inode) : NULL;
 522
 523         struct dentry *cache_old_dentry = NULL;
 524         struct dentry *cache_new_dentry = NULL;
 525         struct dentry *cache_new_parent = NULL;
 526         struct dentry *cache_old_parent = NULL;
 527         void *handle = NULL;
 528         int    rc = 0;
 529
 530         if (!cache_old_dir || !cache_new_dir || !cache_old_inode)
 531                 RETURN(-ENOENT);
 532
 533         handle = smfs_trans_start(old_dir, FSFILT_OP_RENAME, NULL);
 534         if (IS_ERR(handle)) {
 535                 CERROR("smfs_do_mkdir: no space for transaction\n");
 536                 RETURN(-ENOSPC);
 537         }
 538         lock_kernel();
 539
 540         SMFS_CACHE_HOOK_PRE(CACHE_HOOK_RENAME, handle, old_dir);
 541
 542         cache_old_parent = pre_smfs_dentry(NULL, cache_old_dir, old_dentry);
 543         cache_old_dentry = pre_smfs_dentry(cache_old_parent, cache_old_inode,
 544                                            old_dentry);
 545         if (!cache_old_parent || !cache_old_dentry)
 546                 GOTO(exit, rc = -ENOMEM);
 547
 548         cache_new_parent = pre_smfs_dentry(NULL, cache_new_dir, new_dentry);
 549         cache_new_dentry = pre_smfs_dentry(cache_new_parent, cache_new_inode,
 550                                            new_dentry);
 551         if (!cache_new_parent || !cache_new_dentry)
 552                 GOTO(exit, rc = -ENOMEM);
 553
 554         pre_smfs_inode(old_dir, cache_old_dir);
 555         pre_smfs_inode(new_dir, cache_new_dir);
 556
 557         if (cache_old_dir->i_op->rename)
 558                 rc = cache_old_dir->i_op->rename(cache_old_dir, cache_old_dentry,
 559                                                  cache_new_dir, cache_new_dentry);
 560
 561         post_smfs_inode(old_dir, cache_old_dir);
 562         post_smfs_inode(new_dir, cache_new_dir);
 563
 564         SMFS_KML_POST(old_dir, old_dentry, new_dir,
 565                       new_dentry, REINT_RENAME, "rename", rc, exit);
 566         if (new_dentry->d_inode)
 567                 post_smfs_inode(new_dentry->d_inode, cache_new_dentry->d_inode);
 568
 569         SMFS_CACHE_HOOK_POST(CACHE_HOOK_RENAME, handle, old_dir, old_dentry,
 570                              new_dir, new_dentry, rc, exit);
 571 exit:
 572         unlock_kernel();
 573         post_smfs_dentry(cache_old_dentry);
 574         post_smfs_dentry(cache_old_parent);
 575         post_smfs_dentry(cache_new_dentry);
 576         post_smfs_dentry(cache_new_parent);
 577         smfs_trans_commit(old_dir, handle, 0);
 578         RETURN(rc);
 579 }
 580
 581 struct inode_operations smfs_dir_iops = {
 582         create:         smfs_create,
 583         lookup:         smfs_lookup,
 584         link:           smfs_link,              /* BKL held */
 585         unlink:         smfs_unlink,            /* BKL held */
 586         symlink:        smfs_symlink,           /* BKL held */
 587         mkdir:          smfs_mkdir,             /* BKL held */
 588         rmdir:          smfs_rmdir,             /* BKL held */
 589         mknod:          smfs_mknod,             /* BKL held */
 590         rename:         smfs_rename,            /* BKL held */
 591         setxattr:       smfs_setxattr,          /* BKL held */
 592         getxattr:       smfs_getxattr,          /* BKL held */
 593         listxattr:      smfs_listxattr,         /* BKL held */
 594         removexattr:    smfs_removexattr,       /* BKL held */
 595 };
 596
 597 static ssize_t smfs_read_dir(struct file *filp, char *buf,
 598                              size_t size, loff_t *ppos)
 599 {
 600         struct dentry *dentry = filp->f_dentry;
 601         struct inode *cache_inode = NULL;
 602         struct smfs_file_info *sfi = NULL;
 603         loff_t tmp_ppos;
 604         loff_t *cache_ppos;
 605         int    rc = 0;
 606
 607         cache_inode = I2CI(dentry->d_inode);
 608
 609         if (!cache_inode)
 610                 RETURN(-EINVAL);
 611
 612         sfi = F2SMFI(filp);
 613         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 614
 615         if (ppos != &(filp->f_pos))
 616                 cache_ppos = &tmp_ppos;
 617         else
 618                 cache_ppos = &sfi->c_file->f_pos;
 619         *cache_ppos = *ppos;
 620
 621         if (cache_inode->i_fop->read)
 622                 rc = cache_inode->i_fop->read(sfi->c_file, buf, size,
 623                                               cache_ppos);
 624
 625         *ppos = *cache_ppos;
 626         duplicate_file(filp, sfi->c_file);
 627         RETURN(rc);
 628 }
 629
 630 static int smfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 631 {
 632         struct dentry *dentry = filp->f_dentry;
 633         struct inode *cache_inode = NULL;
 634         struct smfs_file_info *sfi = NULL;
 635         int    rc = 0;
 636
 637         cache_inode = I2CI(dentry->d_inode);
 638         if (!cache_inode)
 639                 RETURN(-EINVAL);
 640
 641         sfi = F2SMFI(filp);
 642         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 643
 644         if (cache_inode->i_fop->readdir)
 645                 rc = cache_inode->i_fop->readdir(sfi->c_file, dirent, filldir);
 646
 647         duplicate_file(filp, sfi->c_file);
 648         RETURN(rc);
 649 }
 650
 651 struct file_operations smfs_dir_fops = {
 652         read:           smfs_read_dir,
 653         readdir:        smfs_readdir,           /* BKL held */
 654         ioctl:          smfs_ioctl,             /* BKL held */
 655         fsync:          smfs_fsync,         /* BKL held */
 656         open:           smfs_open,
 657         release:        smfs_release,
 658 };