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 #include <linux/lustre_snap.h>
  39 #include <linux/security.h>
  40 #include "smfs_internal.h"
  41
  42 //#define NAME_ALLOC_LEN(len)     ((len+16) & ~15)
  43
  44 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  45 static int smfs_create(struct inode *dir, struct dentry *dentry,
  46                        int mode)
  47 #else
  48 static int smfs_create(struct inode *dir, struct dentry *dentry,
  49                        int mode, struct nameidata *nd)
  50 #endif
  51 {
  52         struct inode *inode = NULL;
  53         struct inode *parent = I2CI(dentry->d_parent->d_inode);
  54         struct inode *cache_dir = I2CI(dir);
  55         struct dentry *cache_dentry = NULL;
  56         struct dentry *cache_parent = NULL;
  57         void *handle = NULL;
  58         struct hook_msg msg = {
  59                 .dentry = dentry,
  60         };
  61         int rc = 0;
  62
  63         ENTRY;
  64
  65         LASSERT(cache_dir);
  66         LASSERT(cache_dir->i_op->create);
  67
  68         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
  69         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
  70         if (!cache_dentry || !cache_parent) {
  71                 rc = -ENOMEM;
  72                 goto exit;
  73         }
  74
  75         handle = smfs_trans_start(dir, FSFILT_OP_CREATE, NULL);
  76         if (IS_ERR(handle)) {
  77                 rc = -ENOSPC;
  78                 goto exit;
  79         }
  80
  81         SMFS_PRE_HOOK(dir, HOOK_CREATE, &msg);
  82
  83         pre_smfs_inode(dir, cache_dir);
  84
  85 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  86         rc = cache_dir->i_op->create(cache_dir, cache_dentry, mode);
  87 #else
  88         rc = cache_dir->i_op->create(cache_dir, cache_dentry, mode, nd);
  89 #endif
  90         if (!rc) {
  91                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
  92                                        I2SMI(dir), 0);
  93                 if (inode) {
  94                         d_instantiate(dentry, inode);
  95                 }
  96                 else
  97                         rc = -ENOENT;
  98         }
  99
 100         SMFS_POST_HOOK(dir, HOOK_CREATE, &msg, rc);
 101
 102         post_smfs_inode(dir, cache_dir);
 103         smfs_trans_commit(dir, handle, 0);
 104
 105 exit:
 106         post_smfs_dentry(cache_dentry);
 107         post_smfs_dentry(cache_parent);
 108         RETURN(rc);
 109 }
 110
 111 static struct dentry * iopen_connect_dentry(struct dentry * dentry,
 112                                      struct inode *inode, int rehash)
 113 {
 114         struct dentry *tmp, *goal = NULL;
 115         struct list_head *lp;
 116
 117         /* verify this dentry is really new */
 118         LASSERT(dentry->d_inode == NULL);
 119         LASSERT(list_empty(&dentry->d_alias));          /* d_instantiate */
 120         if (rehash)
 121                 LASSERT(d_unhashed(dentry));    /* d_rehash */
 122         LASSERT(list_empty(&dentry->d_subdirs));
 123
 124         spin_lock(&dcache_lock);
 125         if (!inode)
 126                 goto do_rehash;
 127
 128         /* preferrably return a connected dentry */
 129         list_for_each(lp, &inode->i_dentry) {
 130                 tmp = list_entry(lp, struct dentry, d_alias);
 131                 if (tmp->d_flags & DCACHE_DISCONNECTED) {
 132                         LASSERT(tmp->d_alias.next == &inode->i_dentry);
 133                         LASSERT(tmp->d_alias.prev == &inode->i_dentry);
 134                         goal = tmp;
 135                         dget_locked(goal);
 136                         break;
 137                 }
 138         }
 139
 140         if (!goal)
 141                 goto do_instantiate;
 142
 143         /* Move the goal to the de hash queue */
 144         goal->d_flags &= ~ DCACHE_DISCONNECTED;
 145         security_d_instantiate(goal, inode);
 146         __d_rehash(dentry);
 147         __d_move(goal, dentry);
 148         spin_unlock(&dcache_lock);
 149         iput(inode);
 150
 151         RETURN(goal);
 152
 153         /* d_add(), but don't drop dcache_lock before adding dentry to inode */
 154 do_instantiate:
 155         list_add(&dentry->d_alias, &inode->i_dentry);   /* d_instantiate */
 156         dentry->d_inode = inode;
 157 do_rehash:
 158         if (rehash)
 159                 __d_rehash(dentry);
 160         spin_unlock(&dcache_lock);
 161
 162         RETURN(NULL);
 163
 164 }
 165
 166 static int smfs_do_lookup (struct inode * dir,
 167                            struct dentry * dentry,
 168                            struct nameidata *nd,
 169                            struct inode **inode)
 170 {
 171         struct inode *cache_dir = I2CI(dir);
 172         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 173         struct dentry *cache_dentry = NULL;
 174         struct dentry *cache_parent = NULL;
 175         struct dentry *rdentry = NULL, *tmp = NULL;
 176         int rc = 0;
 177         struct hook_msg msg = {
 178                 .dentry = dentry,
 179         };
 180
 181         ENTRY;
 182
 183         if (!cache_dir)
 184                 RETURN(-ENOENT);
 185
 186         LASSERT(cache_dir->i_op->lookup);
 187
 188         /* preparing artificial backing fs dentries. */
 189         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 190         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 191         if (!cache_dentry || !cache_parent) {
 192                 rc = -ENOMEM;
 193                 goto exit;
 194         }
 195
 196         SMFS_PRE_HOOK(dir, HOOK_LOOKUP, &msg);
 197
 198         /* perform lookup in backing fs. */
 199         rdentry = cache_dir->i_op->lookup(cache_dir, cache_dentry, nd);
 200         if (rdentry) {
 201                 if (IS_ERR(rdentry)) {
 202                         rc = PTR_ERR(rdentry);
 203                         rdentry = NULL;
 204                 } else {
 205                         tmp = rdentry;
 206                 }
 207         } else {
 208                 tmp = cache_dentry;
 209         }
 210
 211         SMFS_POST_HOOK(dir, HOOK_LOOKUP, &msg, rc);
 212
 213         if (tmp) {
 214                 //copy fields if DCACHE_CROSS_REF
 215                 smfs_update_dentry(dentry, tmp);
 216
 217                 if (tmp->d_inode) {
 218                         *inode = smfs_get_inode(dir->i_sb, tmp->d_inode,
 219                                                 I2SMI(dir), 0);
 220                         if (!(*inode))
 221                                 rc = -ENOENT;
 222                         else {
 223                                 if (!tmp->d_inode->i_nlink) {
 224                                         struct inode * ind = tmp->d_inode;
 225
 226                                         CWARN("inode #%lu (%*s) nlink is %i/%i\n",
 227                                               ind->i_ino, tmp->d_name.len,
 228                                               tmp->d_name.name, ind->i_nlink,
 229                                               (*inode)->i_nlink);
 230                                         CWARN("parent #%lu (%*s) nlink is %i\n",
 231                                               dir->i_ino, tmp->d_parent->d_name.len,
 232                                               tmp->d_parent->d_name.name,
 233                                               cache_dir->i_nlink);
 234                                         LBUG();
 235                                 }
 236                         }
 237                 }
 238         }
 239
 240         if (rdentry) {
 241                 dput(rdentry);
 242         }
 243
 244 exit:
 245         post_smfs_dentry(cache_dentry);
 246         post_smfs_dentry(cache_parent);
 247
 248         RETURN(rc);
 249 }
 250
 251 static struct dentry * smfs_iopen_lookup(struct inode * dir,
 252                                          struct dentry *dentry,
 253                                          struct nameidata *nd)
 254 {
 255         struct dentry * alternate = NULL;
 256         struct inode *inode = NULL;
 257         int rc = 0;
 258         ENTRY;
 259
 260         rc = smfs_do_lookup(dir, dentry, nd, &inode);
 261         if (rc)
 262                 RETURN(ERR_PTR(rc));
 263
 264         LASSERT(inode);
 265         /* preferrably return a connected dentry */
 266         spin_lock(&dcache_lock);
 267         list_for_each_entry(alternate, &inode->i_dentry, d_alias) {
 268                 LASSERT(!(alternate->d_flags & DCACHE_DISCONNECTED));
 269         }
 270
 271         list_for_each_entry(alternate, &inode->i_dentry, d_alias) {
 272                 dget_locked(alternate);
 273                 spin_lock(&alternate->d_lock);
 274                 alternate->d_flags |= DCACHE_REFERENCED;
 275                 spin_unlock(&alternate->d_lock);
 276                 iput(inode);
 277                 spin_unlock(&dcache_lock);
 278                 RETURN(alternate);
 279         }
 280
 281         dentry->d_flags |= DCACHE_DISCONNECTED;
 282
 283         /* d_add(), but don't drop dcache_lock before adding dentry to inode */
 284         list_add(&dentry->d_alias, &inode->i_dentry);   /* d_instantiate */
 285         dentry->d_inode = inode;
 286
 287         __d_rehash(dentry);                             /* d_rehash */
 288         spin_unlock(&dcache_lock);
 289
 290         return NULL;
 291 }
 292
 293 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 294 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry)
 295 #else
 296 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry,
 297                                   struct nameidata *nd)
 298 #endif
 299 {
 300         struct dentry * rdentry = NULL;
 301         struct inode * inode = NULL;
 302         int rc;
 303
 304         ENTRY;
 305
 306         rc = smfs_do_lookup(dir, dentry, nd, &inode);
 307         if (rc)
 308                 RETURN(ERR_PTR(rc));
 309
 310         //lmv stuff. Special dentry that has no inode.
 311         if (dentry->d_flags & DCACHE_CROSS_REF) {
 312                 d_add(dentry, NULL);
 313                 RETURN(NULL);
 314         }
 315         //TODO: should flags be checked and copied before?
 316         rdentry = iopen_connect_dentry(dentry, inode, 1);
 317
 318         RETURN(rdentry);
 319 }
 320
 321 #if HAVE_LOOKUP_RAW
 322 static int smfs_lookup_raw(struct inode *dir, const char *name,
 323                            int len, ino_t *data)
 324 {
 325         struct inode *cache_dir = I2CI(dir);
 326         int rc = 0;
 327
 328         if (!cache_dir)
 329                 RETURN(-ENOENT);
 330
 331         if (cache_dir->i_op->lookup_raw) {
 332                 rc = cache_dir->i_op->lookup_raw(cache_dir, name, len, data);
 333         } else {
 334                 CWARN("do not have raw lookup ops in bottom fs\n");
 335         }
 336
 337         RETURN(rc);
 338 }
 339 #endif
 340
 341 static int smfs_link(struct dentry *old_dentry,
 342                      struct inode *dir, struct dentry *dentry)
 343 {
 344         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 345         struct inode *cache_dir = I2CI(dir);
 346         struct inode *old_inode = old_dentry->d_inode;
 347         struct inode *cache_old_inode = I2CI(old_inode);
 348         struct dentry *cache_old_dentry = NULL;
 349         struct dentry *cache_dentry = NULL;
 350         struct dentry *cache_parent = NULL;
 351         void *handle = NULL;
 352         int rc = 0;
 353         struct hook_link_msg msg = {
 354                 .dentry = old_dentry,
 355                 .new_dentry = dentry
 356         };
 357
 358         ENTRY;
 359
 360         if (!cache_dir)
 361                 RETURN(-ENOENT);
 362
 363         if (!cache_old_inode)
 364                 RETURN(-ENOENT);
 365
 366         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 367         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 368         cache_old_dentry = pre_smfs_dentry(NULL, cache_old_inode, old_dentry);
 369         if (!cache_old_dentry || !cache_dentry || !cache_parent) {
 370                 rc = -ENOMEM;
 371                 goto exit;
 372         }
 373
 374         handle = smfs_trans_start(dir, FSFILT_OP_LINK, NULL);
 375         if (IS_ERR(handle)) {
 376                  rc = -ENOSPC;
 377                  goto exit;
 378         }
 379
 380         pre_smfs_inode(dir, cache_dir);
 381         pre_smfs_inode(old_inode, cache_old_inode);
 382
 383         //lock_kernel();
 384         SMFS_PRE_HOOK(dir, HOOK_LINK, &msg);
 385
 386         rc = cache_dir->i_op->link(cache_old_dentry, cache_dir, cache_dentry);
 387         if (!rc) {
 388                 atomic_inc(&old_inode->i_count);
 389                 old_inode->i_nlink++;
 390                 dput(iopen_connect_dentry(dentry, old_inode, 0));
 391         }
 392
 393         SMFS_POST_HOOK(dir, HOOK_LINK, &msg, rc);
 394
 395         post_smfs_inode(old_inode, cache_old_inode);
 396         post_smfs_inode(dir, cache_dir);
 397
 398         smfs_trans_commit(dir, handle, 0);
 399
 400 exit:
 401         //unlock_kernel();
 402         post_smfs_dentry(cache_dentry);
 403         post_smfs_dentry(cache_parent);
 404         post_smfs_dentry(cache_old_dentry);
 405
 406         RETURN(rc);
 407 }
 408
 409 static int smfs_unlink(struct inode * dir, struct dentry *dentry)
 410 {
 411         struct inode *cache_dir = I2CI(dir);
 412         struct inode *cache_inode = I2CI(dentry->d_inode);
 413         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 414         struct dentry *cache_dentry = NULL;
 415         struct dentry *cache_parent = NULL;
 416         void   *handle = NULL;
 417         int    rc = 0;
 418         //int    mode = 0;
 419         struct hook_unlink_msg msg = {
 420                 .dentry = dentry,
 421                 .mode = dentry->d_inode->i_mode
 422         };
 423
 424         ENTRY;
 425
 426         LASSERT(cache_dir);
 427         LASSERT(cache_inode);
 428         LASSERT(cache_dir->i_op->unlink);
 429         LASSERT(parent);
 430
 431         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 432         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 433         if (!cache_dentry || !cache_parent) {
 434                 rc = -ENOMEM;
 435                 goto exit;
 436         }
 437
 438         handle = smfs_trans_start(dir, FSFILT_OP_UNLINK, NULL);
 439         if (IS_ERR(handle)) {
 440                 rc = -ENOSPC;
 441                 goto exit;
 442         }
 443
 444         pre_smfs_inode(dir, cache_dir);
 445         pre_smfs_inode(dentry->d_inode, cache_inode);
 446
 447         SMFS_PRE_HOOK(dir, HOOK_UNLINK, &msg);
 448
 449         rc = cache_dir->i_op->unlink(cache_dir, cache_dentry);
 450
 451         SMFS_POST_HOOK(dir, HOOK_UNLINK, &msg, rc);
 452         if (!rc) {
 453                 post_smfs_inode(dentry->d_inode, cache_inode);
 454                 dentry->d_inode->i_nlink--;
 455                 post_smfs_inode(dir, cache_dir);
 456         }
 457
 458         smfs_trans_commit(dir, handle, 0);
 459 exit:
 460         post_smfs_dentry(cache_dentry);
 461         post_smfs_dentry(cache_parent);
 462         RETURN(rc);
 463 }
 464
 465 static int smfs_symlink(struct inode *dir, struct dentry *dentry,
 466                         const char *symname)
 467 {
 468         struct inode *cache_dir = I2CI(dir);
 469         struct inode *inode = NULL;
 470         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 471         struct dentry *cache_dentry = NULL;
 472         struct dentry *cache_parent = NULL;
 473         void   *handle = NULL;
 474         int    rc = 0;
 475         struct hook_symlink_msg msg = {
 476                 .dentry = dentry,
 477                 .tgt_len = strlen(symname) + 1,
 478                 .symname = (char*)symname
 479         };
 480
 481         ENTRY;
 482
 483         LASSERT(cache_dir);
 484         LASSERT(cache_dir->i_op->symlink);
 485         LASSERT(parent);
 486
 487         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 488         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 489         if (!cache_parent || !cache_dentry) {
 490                 rc = -ENOMEM;
 491                 goto exit;
 492         }
 493
 494         handle = smfs_trans_start(dir, FSFILT_OP_SYMLINK, NULL);
 495         if (IS_ERR(handle)) {
 496                 rc = -ENOSPC;
 497                 goto exit;
 498         }
 499
 500         pre_smfs_inode(dir, cache_dir);
 501
 502         SMFS_PRE_HOOK(dir, HOOK_SYMLINK, &msg);
 503
 504         rc = cache_dir->i_op->symlink(cache_dir, cache_dentry, symname);
 505         if (!rc) {
 506                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 507                                        I2SMI(dir), 0);
 508                 if (inode) {
 509                         d_instantiate(dentry, inode);
 510                 }
 511                 else
 512                         rc = -ENOENT;
 513         }
 514
 515         SMFS_POST_HOOK(dir, HOOK_SYMLINK, &msg, rc);
 516
 517         post_smfs_inode(dir, cache_dir);
 518         smfs_trans_commit(dir, handle, 0);
 519
 520 exit:
 521         post_smfs_dentry(cache_dentry);
 522         post_smfs_dentry(cache_parent);
 523         RETURN(rc);
 524 }
 525
 526 static int smfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 527 {
 528         struct inode *cache_dir = I2CI(dir);
 529         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 530         struct inode *inode = NULL;
 531         struct dentry *cache_dentry = NULL;
 532         struct dentry *cache_parent = NULL;
 533         void   *handle = NULL;
 534         int    rc = 0;
 535         struct hook_msg msg = {
 536                 .dentry = dentry,
 537         };
 538
 539         ENTRY;
 540
 541         LASSERT(cache_dir);
 542         LASSERT(parent);
 543
 544         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 545         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 546         if (!cache_parent || !cache_dentry) {
 547                 rc = -ENOMEM;
 548                 goto exit;
 549         }
 550
 551         handle = smfs_trans_start(dir, FSFILT_OP_MKDIR, NULL);
 552         if (IS_ERR(handle)) {
 553                 rc = -ENOSPC;
 554                 goto exit;
 555         }
 556
 557         pre_smfs_inode(dir, cache_dir);
 558         SMFS_PRE_HOOK(dir, HOOK_MKDIR, &msg);
 559
 560         rc = cache_dir->i_op->mkdir(cache_dir, cache_dentry, mode);
 561         if (!rc) {
 562                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 563                                        I2SMI(dir), 0);
 564                 if (inode) {
 565                         dir->i_nlink++;
 566                         d_instantiate(dentry, inode);
 567                 }
 568                 else
 569                         rc = -ENOENT;
 570         }
 571
 572         SMFS_POST_HOOK(dir, HOOK_MKDIR, &msg, rc);
 573         post_smfs_inode(dir, cache_dir);
 574         smfs_trans_commit(dir, handle, 0);
 575
 576 exit:
 577         post_smfs_dentry(cache_dentry);
 578         post_smfs_dentry(cache_parent);
 579         RETURN(rc);
 580 }
 581
 582 static int smfs_rmdir(struct inode *dir, struct dentry *dentry)
 583 {
 584         struct inode *cache_dir = I2CI(dir);
 585         struct inode *cache_inode = I2CI(dentry->d_inode);
 586         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 587         struct dentry *cache_dentry = NULL;
 588         struct dentry *cache_parent = NULL;
 589         struct inode * inode = dentry->d_inode;
 590         void *handle = NULL;
 591         int    rc = 0;
 592         struct hook_unlink_msg msg = {
 593                 .dentry = dentry,
 594                 .mode = S_IFDIR
 595         };
 596
 597         ENTRY;
 598
 599         LASSERT(cache_dir);
 600         LASSERT(cache_dir->i_op->rmdir);
 601         LASSERT(parent);
 602
 603         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 604         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 605         if (!cache_parent || !cache_dentry) {
 606                 rc = -ENOMEM;
 607                 goto exit;
 608         }
 609
 610         handle = smfs_trans_start(dir, FSFILT_OP_RMDIR, NULL);
 611         if (IS_ERR(handle) ) {
 612                 rc = -ENOSPC;
 613                 goto exit;
 614         }
 615
 616         dentry_unhash(cache_dentry);
 617
 618         pre_smfs_inode(dir, cache_dir);
 619         pre_smfs_inode(inode, cache_inode);
 620
 621         SMFS_PRE_HOOK(dir, HOOK_RMDIR, &msg);
 622
 623         rc = cache_dir->i_op->rmdir(cache_dir, cache_dentry);
 624
 625         SMFS_POST_HOOK(dir, HOOK_RMDIR, &msg, rc);
 626         if (!rc) {
 627                 if (inode->i_nlink != 2)
 628                         CWARN("Directory #%lu under rmdir has %i nlinks\n",
 629                                 inode->i_ino, inode->i_nlink);
 630                 inode->i_nlink = 0;
 631                 dir->i_nlink--;
 632                 post_smfs_inode(dir, cache_dir);
 633                 post_smfs_inode(inode, cache_inode);
 634                 //like vfs_rmdir is doing with inode
 635                 cache_inode->i_flags |= S_DEAD;
 636         }
 637         smfs_trans_commit(dir, handle, 0);
 638         dput(cache_dentry);
 639 exit:
 640         post_smfs_dentry(cache_dentry);
 641         post_smfs_dentry(cache_parent);
 642         RETURN(rc);
 643 }
 644
 645 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 646 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 647                       int mode, int rdev)
 648 #else
 649 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 650                       int mode, dev_t rdev)
 651 #endif
 652 {
 653         struct inode *cache_dir = I2CI(dir);
 654         struct inode *inode = NULL;
 655         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 656         struct dentry *cache_dentry = NULL;
 657         struct dentry *cache_parent = NULL;
 658         void *handle = NULL;
 659         int rc = 0;
 660         struct hook_msg msg = {
 661                 .dentry = dentry,
 662         };
 663
 664         ENTRY;
 665
 666         LASSERT(parent);
 667         LASSERT(cache_dir);
 668         LASSERT(cache_dir->i_op->mknod);
 669
 670         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 671         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 672         if (!cache_parent || !cache_dentry) {
 673                 rc = -ENOMEM;
 674                 goto exit;
 675         }
 676
 677         handle = smfs_trans_start(dir, FSFILT_OP_MKNOD, NULL);
 678         if (IS_ERR(handle)) {
 679                 rc = -ENOSPC;
 680                 goto exit;
 681         }
 682
 683         pre_smfs_inode(dir, cache_dir);
 684
 685         SMFS_PRE_HOOK(dir, HOOK_MKNOD, &msg);
 686
 687         rc = cache_dir->i_op->mknod(cache_dir, cache_dentry, mode, rdev);
 688         if (!rc) {
 689                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 690                                        I2SMI(dir), 0);
 691                 if (inode) {
 692                         //smsf_update_dentry(dentry, cache_dentry);
 693                         d_instantiate(dentry, inode);
 694                 }
 695                 else
 696                         rc = -ENOENT;
 697         }
 698
 699         SMFS_POST_HOOK(dir, HOOK_MKNOD, &msg, rc);
 700
 701         post_smfs_inode(dir, cache_dir);
 702
 703         smfs_trans_commit(dir, handle, 0);
 704
 705 exit:
 706         post_smfs_dentry(cache_dentry);
 707         post_smfs_dentry(cache_parent);
 708         RETURN(rc);
 709 }
 710
 711 static int smfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 712                        struct inode *new_dir,struct dentry *new_dentry)
 713 {
 714         struct inode *cache_old_dir = I2CI(old_dir);
 715         struct inode *cache_new_dir = I2CI(new_dir);
 716         struct inode *new_inode = new_dentry->d_inode;
 717         struct inode *cache_old_inode = I2CI(old_dentry->d_inode);
 718         struct inode *old_parent = I2CI(old_dentry->d_parent->d_inode);
 719         struct inode *new_parent = I2CI(new_dentry->d_parent->d_inode);
 720         struct inode *cache_new_inode = NULL;
 721         struct dentry *cache_old_dentry = NULL;
 722         struct dentry *cache_new_dentry = NULL;
 723         struct dentry *cache_new_parent = NULL;
 724         struct dentry *cache_old_parent = NULL;
 725         void *handle = NULL;
 726         int    rc = 0;
 727         struct hook_rename_msg msg = {
 728                 .dentry = old_dentry,
 729                 .new_dir = new_dir,
 730                 .new_dentry = new_dentry
 731         };
 732
 733         ENTRY;
 734
 735         if (!cache_old_dir || !cache_new_dir || !cache_old_inode)
 736                 RETURN(-ENOENT);
 737
 738         if (new_inode) {
 739                 cache_new_inode = I2CI(new_inode);
 740                 if (!cache_new_inode)
 741                         RETURN(-ENOENT);
 742         }
 743
 744         cache_old_parent = pre_smfs_dentry(NULL, old_parent, old_dentry->d_parent);
 745         cache_old_dentry = pre_smfs_dentry(cache_old_parent, cache_old_inode,
 746                                            old_dentry);
 747         if (!cache_old_parent || !cache_old_dentry) {
 748                 rc = -ENOMEM;
 749                 goto exit;
 750         }
 751
 752         cache_new_parent = pre_smfs_dentry(NULL, new_parent, new_dentry->d_parent);
 753         cache_new_dentry = pre_smfs_dentry(cache_new_parent, cache_new_inode,
 754                                            new_dentry);
 755         if (!cache_new_parent || !cache_new_dentry) {
 756                 rc = -ENOMEM;
 757                 goto exit;
 758         }
 759
 760         handle = smfs_trans_start(old_dir, FSFILT_OP_RENAME, NULL);
 761         if (IS_ERR(handle)) {
 762                 rc = -ENOSPC;
 763                 goto exit;
 764         }
 765
 766         pre_smfs_inode(old_dir, cache_old_dir);
 767         pre_smfs_inode(new_dir, cache_new_dir);
 768         pre_smfs_inode(old_dentry->d_inode, cache_old_inode);
 769         if (new_inode)
 770                 pre_smfs_inode(new_inode, cache_new_inode);
 771
 772         SMFS_PRE_HOOK(old_dir, HOOK_RENAME, &msg);
 773
 774         rc = cache_old_dir->i_op->rename(cache_old_dir, cache_old_dentry,
 775                                          cache_new_dir, cache_new_dentry);
 776
 777         SMFS_POST_HOOK(old_dir, HOOK_RENAME, &msg, rc);
 778         if (!rc) {
 779                 post_smfs_inode(old_dir, cache_old_dir);
 780                 post_smfs_inode(new_dir, cache_new_dir);
 781                 post_smfs_inode(old_dentry->d_inode, cache_old_inode);
 782                 if (new_inode) {
 783                         post_smfs_inode(new_inode, cache_new_inode);
 784                         new_inode->i_nlink--;
 785                 }
 786                 //directory is renamed
 787                 if (S_ISDIR(old_dentry->d_inode->i_mode)) {
 788                         old_dir->i_nlink--;
 789                         if (new_inode) {
 790                                 new_inode->i_nlink--;
 791                         } else {
 792                                 new_dir->i_nlink++;
 793                         }
 794                 }
 795         }
 796         smfs_trans_commit(old_dir, handle, 0);
 797
 798 exit:
 799         post_smfs_dentry(cache_old_dentry);
 800         post_smfs_dentry(cache_old_parent);
 801         post_smfs_dentry(cache_new_dentry);
 802         post_smfs_dentry(cache_new_parent);
 803         RETURN(rc);
 804 }
 805
 806 struct inode_operations smfs_dir_iops = {
 807         .create         = smfs_create,
 808         .lookup         = smfs_lookup,
 809 #if HAVE_LOOKUP_RAW
 810         .lookup_raw     = smfs_lookup_raw,
 811 #endif
 812         .link           = smfs_link,
 813         .unlink         = smfs_unlink,
 814         .symlink        = smfs_symlink,
 815         .mkdir          = smfs_mkdir,
 816         .rmdir          = smfs_rmdir,
 817         .mknod          = smfs_mknod,
 818         .rename         = smfs_rename,
 819         .setxattr       = smfs_setxattr,
 820         .getxattr       = smfs_getxattr,
 821         .listxattr      = smfs_listxattr,
 822         .removexattr    = smfs_removexattr,
 823         .permission     = smfs_permission,
 824 };
 825
 826 struct inode_operations smfs_iopen_iops = {
 827         .lookup         = smfs_iopen_lookup,
 828 };
 829
 830 static ssize_t smfs_read_dir(struct file *filp, char *buf,
 831                              size_t size, loff_t *ppos)
 832 {
 833         struct dentry *dentry = filp->f_dentry;
 834         struct inode *cache_inode = NULL;
 835         struct smfs_file_info *sfi = NULL;
 836         loff_t tmp_ppos;
 837         loff_t *cache_ppos = NULL;
 838         int    rc = 0;
 839
 840         ENTRY;
 841
 842         cache_inode = I2CI(dentry->d_inode);
 843
 844         if (!cache_inode || !cache_inode->i_fop->read)
 845                 RETURN(-EINVAL);
 846
 847         sfi = F2SMFI(filp);
 848         if (sfi->magic != SMFS_FILE_MAGIC)
 849                 BUG();
 850
 851         if (ppos != &(filp->f_pos))
 852                 cache_ppos = &tmp_ppos;
 853         else
 854                 cache_ppos = &sfi->c_file->f_pos;
 855
 856         *cache_ppos = *ppos;
 857
 858         rc = cache_inode->i_fop->read(sfi->c_file, buf, size, cache_ppos);
 859         if (rc)
 860                 RETURN(rc);
 861
 862         *ppos = *cache_ppos;
 863
 864         duplicate_file(filp, sfi->c_file);
 865
 866         RETURN(rc);
 867 }
 868
 869 static int smfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 870 {
 871         struct dentry *dentry = filp->f_dentry;
 872         struct inode *cache_inode = NULL;
 873         struct smfs_file_info *sfi = NULL;
 874         int    rc = 0;
 875         struct hook_readdir_msg msg = {
 876                 .dentry = dentry,
 877                 .filp = filp,
 878                 .dirent = dirent,
 879                 .filldir = filldir
 880         };
 881
 882         ENTRY;
 883
 884         cache_inode = I2CI(dentry->d_inode);
 885         if (!cache_inode || !cache_inode->i_fop->readdir)
 886                 RETURN(-EINVAL);
 887
 888         sfi = F2SMFI(filp);
 889         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 890
 891         SMFS_PRE_HOOK(dentry->d_inode, HOOK_READDIR, &msg);
 892
 893         rc = cache_inode->i_fop->readdir(sfi->c_file, dirent, filldir);
 894
 895         SMFS_POST_HOOK(dentry->d_inode, HOOK_READDIR, &msg, rc);
 896         duplicate_file(filp, sfi->c_file);
 897
 898         RETURN(rc);
 899 }
 900
 901 struct file_operations smfs_dir_fops = {
 902         .read           = smfs_read_dir,
 903         .readdir        = smfs_readdir,       /* BKL held */
 904         .ioctl          = smfs_ioctl,         /* BKL held */
 905         .fsync          = smfs_fsync,         /* BKL held */
 906         .open           = smfs_open,
 907         .release        = smfs_release,
 908 };
 909
 910 struct file_operations smfs_iopen_fops = {
 911         .read           = smfs_read_dir,
 912 };
 913