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         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
  66                dentry->d_name.len, dentry->d_name.name, dentry,
  67                dir->i_ino, dir->i_generation);
  68
  69         LASSERT(cache_dir);
  70         LASSERT(cache_dir->i_op->create);
  71
  72         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
  73         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
  74         if (!cache_dentry || !cache_parent) {
  75                 rc = -ENOMEM;
  76                 goto exit;
  77         }
  78
  79         handle = smfs_trans_start(dir, FSFILT_OP_CREATE, NULL);
  80         if (IS_ERR(handle)) {
  81                 rc = -ENOSPC;
  82                 goto exit;
  83         }
  84
  85         SMFS_PRE_HOOK(dir, HOOK_CREATE, &msg);
  86
  87         pre_smfs_inode(dir, cache_dir);
  88
  89 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  90         rc = cache_dir->i_op->create(cache_dir, cache_dentry, mode);
  91 #else
  92         rc = cache_dir->i_op->create(cache_dir, cache_dentry, mode, nd);
  93 #endif
  94         if (!rc) {
  95                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
  96                                        I2SMI(dir), 0);
  97                 if (inode) {
  98                         d_instantiate(dentry, inode);
  99                 }
 100                 else
 101                         rc = -ENOENT;
 102         }
 103
 104         SMFS_POST_HOOK(dir, HOOK_CREATE, &msg, rc);
 105
 106         post_smfs_inode(dir, cache_dir);
 107         smfs_trans_commit(dir, handle, 0);
 108
 109 exit:
 110         post_smfs_dentry(cache_dentry);
 111         post_smfs_dentry(cache_parent);
 112         RETURN(rc);
 113 }
 114
 115 static struct dentry * iopen_connect_dentry(struct dentry * dentry,
 116                                      struct inode *inode, int rehash)
 117 {
 118         struct dentry *tmp, *goal = NULL;
 119         struct list_head *lp;
 120
 121         /* verify this dentry is really new */
 122         LASSERT(dentry->d_inode == NULL);
 123         LASSERT(list_empty(&dentry->d_alias));          /* d_instantiate */
 124         if (rehash)
 125                 LASSERT(d_unhashed(dentry));    /* d_rehash */
 126         LASSERT(list_empty(&dentry->d_subdirs));
 127
 128         spin_lock(&dcache_lock);
 129         if (!inode)
 130                 goto do_rehash;
 131
 132         /* preferrably return a connected dentry */
 133         list_for_each(lp, &inode->i_dentry) {
 134                 tmp = list_entry(lp, struct dentry, d_alias);
 135                 if (tmp->d_flags & DCACHE_DISCONNECTED) {
 136                         LASSERT(tmp->d_alias.next == &inode->i_dentry);
 137                         LASSERT(tmp->d_alias.prev == &inode->i_dentry);
 138                         goal = tmp;
 139                         dget_locked(goal);
 140                         break;
 141                 }
 142         }
 143
 144         if (!goal)
 145                 goto do_instantiate;
 146
 147         /* Move the goal to the de hash queue */
 148         goal->d_flags &= ~ DCACHE_DISCONNECTED;
 149         security_d_instantiate(goal, inode);
 150         __d_rehash(dentry);
 151         __d_move(goal, dentry);
 152         spin_unlock(&dcache_lock);
 153         iput(inode);
 154
 155         RETURN(goal);
 156
 157         /* d_add(), but don't drop dcache_lock before adding dentry to inode */
 158 do_instantiate:
 159         list_add(&dentry->d_alias, &inode->i_dentry);   /* d_instantiate */
 160         dentry->d_inode = inode;
 161 do_rehash:
 162         if (rehash)
 163                 __d_rehash(dentry);
 164         spin_unlock(&dcache_lock);
 165
 166         RETURN(NULL);
 167
 168 }
 169
 170 static int smfs_do_lookup (struct inode * dir,
 171                            struct dentry * dentry,
 172                            struct nameidata *nd,
 173                            struct inode **inode)
 174 {
 175         struct inode *cache_dir = I2CI(dir);
 176         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 177         struct dentry *cache_dentry = NULL;
 178         struct dentry *cache_parent = NULL;
 179         struct dentry *rdentry = NULL, *tmp = NULL;
 180         int rc = 0;
 181         struct hook_msg msg = {
 182                 .dentry = dentry,
 183         };
 184
 185         ENTRY;
 186
 187         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 188                dentry->d_name.len, dentry->d_name.name, dentry,
 189                dir->i_ino, dir->i_generation);
 190
 191         if (!cache_dir)
 192                 RETURN(-ENOENT);
 193
 194         LASSERT(cache_dir->i_op->lookup);
 195
 196         /* preparing artificial backing fs dentries. */
 197         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 198         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 199         if (!cache_dentry || !cache_parent) {
 200                 rc = -ENOMEM;
 201                 goto exit;
 202         }
 203
 204         SMFS_PRE_HOOK(dir, HOOK_LOOKUP, &msg);
 205
 206         /* perform lookup in backing fs. */
 207         rdentry = cache_dir->i_op->lookup(cache_dir, cache_dentry, nd);
 208         if (rdentry) {
 209                 if (IS_ERR(rdentry)) {
 210                         rc = PTR_ERR(rdentry);
 211                         rdentry = NULL;
 212                 } else {
 213                         tmp = rdentry;
 214                 }
 215         } else {
 216                 tmp = cache_dentry;
 217         }
 218
 219         SMFS_POST_HOOK(dir, HOOK_LOOKUP, &msg, rc);
 220
 221         if (tmp) {
 222                 //copy fields if DCACHE_CROSS_REF
 223                 smfs_update_dentry(dentry, tmp);
 224
 225                 if (tmp->d_inode) {
 226                         *inode = smfs_get_inode(dir->i_sb, tmp->d_inode,
 227                                                 I2SMI(dir), 0);
 228                         if (!(*inode))
 229                                 rc = -ENOENT;
 230                         else {
 231                                 if (!tmp->d_inode->i_nlink) {
 232                                         struct inode * ind = tmp->d_inode;
 233
 234                                         CWARN("inode #%lu (%*s) nlink is %i/%i\n",
 235                                               ind->i_ino, tmp->d_name.len,
 236                                               tmp->d_name.name, ind->i_nlink,
 237                                               (*inode)->i_nlink);
 238                                         CWARN("parent #%lu (%*s) nlink is %i\n",
 239                                               dir->i_ino, tmp->d_parent->d_name.len,
 240                                               tmp->d_parent->d_name.name,
 241                                               cache_dir->i_nlink);
 242                                 }
 243                         }
 244                 }
 245         }
 246
 247         if (rdentry) {
 248                 dput(rdentry);
 249         }
 250
 251 exit:
 252         post_smfs_dentry(cache_dentry);
 253         post_smfs_dentry(cache_parent);
 254
 255         RETURN(rc);
 256 }
 257
 258 static struct dentry * smfs_iopen_lookup(struct inode * dir,
 259                                          struct dentry *dentry,
 260                                          struct nameidata *nd)
 261 {
 262         struct dentry * alternate = NULL;
 263         struct inode *inode = NULL;
 264         int rc = 0;
 265         ENTRY;
 266
 267         rc = smfs_do_lookup(dir, dentry, nd, &inode);
 268         if (rc)
 269                 RETURN(ERR_PTR(rc));
 270
 271         LASSERT(inode);
 272         /* preferrably return a connected dentry */
 273         spin_lock(&dcache_lock);
 274         list_for_each_entry(alternate, &inode->i_dentry, d_alias) {
 275                 LASSERT(!(alternate->d_flags & DCACHE_DISCONNECTED));
 276         }
 277
 278         list_for_each_entry(alternate, &inode->i_dentry, d_alias) {
 279                 dget_locked(alternate);
 280                 spin_lock(&alternate->d_lock);
 281                 alternate->d_flags |= DCACHE_REFERENCED;
 282                 spin_unlock(&alternate->d_lock);
 283                 iput(inode);
 284                 spin_unlock(&dcache_lock);
 285                 RETURN(alternate);
 286         }
 287
 288         dentry->d_flags |= DCACHE_DISCONNECTED;
 289
 290         /* d_add(), but don't drop dcache_lock before adding dentry to inode */
 291         list_add(&dentry->d_alias, &inode->i_dentry);   /* d_instantiate */
 292         dentry->d_inode = inode;
 293
 294         __d_rehash(dentry);                             /* d_rehash */
 295         spin_unlock(&dcache_lock);
 296
 297         return NULL;
 298 }
 299
 300 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 301 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry)
 302 #else
 303 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry,
 304                                   struct nameidata *nd)
 305 #endif
 306 {
 307         struct dentry * rdentry = NULL;
 308         struct inode * inode = NULL;
 309         int rc;
 310
 311         ENTRY;
 312
 313         rc = smfs_do_lookup(dir, dentry, nd, &inode);
 314         if (rc)
 315                 RETURN(ERR_PTR(rc));
 316
 317         //lmv stuff. Special dentry that has no inode.
 318         if (dentry->d_flags & DCACHE_CROSS_REF) {
 319                 d_add(dentry, NULL);
 320                 RETURN(NULL);
 321         }
 322         //TODO: should flags be checked and copied before?
 323         rdentry = iopen_connect_dentry(dentry, inode, 1);
 324
 325         RETURN(rdentry);
 326 }
 327
 328 #if HAVE_LOOKUP_RAW
 329 static int smfs_lookup_raw(struct inode *dir, const char *name,
 330                            int len, ino_t *data)
 331 {
 332         struct inode *cache_dir = I2CI(dir);
 333         int rc = 0;
 334
 335         if (!cache_dir)
 336                 RETURN(-ENOENT);
 337
 338         if (cache_dir->i_op->lookup_raw) {
 339                 rc = cache_dir->i_op->lookup_raw(cache_dir, name, len, data);
 340         } else {
 341                 CWARN("do not have raw lookup ops in bottom fs\n");
 342         }
 343
 344         RETURN(rc);
 345 }
 346 #endif
 347
 348 static int smfs_link(struct dentry *old_dentry,
 349                      struct inode *dir, struct dentry *dentry)
 350 {
 351         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 352         struct inode *cache_dir = I2CI(dir);
 353         struct inode *old_inode = old_dentry->d_inode;
 354         struct inode *cache_old_inode = I2CI(old_inode);
 355         struct dentry *cache_old_dentry = NULL;
 356         struct dentry *cache_dentry = NULL;
 357         struct dentry *cache_parent = NULL;
 358         void *handle = NULL;
 359         int rc = 0;
 360         struct hook_link_msg msg = {
 361                 .dentry = old_dentry,
 362                 .new_dentry = dentry
 363         };
 364
 365         ENTRY;
 366
 367         if (!cache_dir)
 368                 RETURN(-ENOENT);
 369
 370         if (!cache_old_inode)
 371                 RETURN(-ENOENT);
 372
 373         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 374         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 375         cache_old_dentry = pre_smfs_dentry(NULL, cache_old_inode, old_dentry);
 376         if (!cache_old_dentry || !cache_dentry || !cache_parent) {
 377                 rc = -ENOMEM;
 378                 goto exit;
 379         }
 380
 381         handle = smfs_trans_start(dir, FSFILT_OP_LINK, NULL);
 382         if (IS_ERR(handle)) {
 383                  rc = -ENOSPC;
 384                  goto exit;
 385         }
 386
 387         pre_smfs_inode(dir, cache_dir);
 388         pre_smfs_inode(old_inode, cache_old_inode);
 389
 390         //lock_kernel();
 391         SMFS_PRE_HOOK(dir, HOOK_LINK, &msg);
 392
 393         rc = cache_dir->i_op->link(cache_old_dentry, cache_dir, cache_dentry);
 394         if (!rc) {
 395                 atomic_inc(&old_inode->i_count);
 396                 old_inode->i_nlink++;
 397                 dput(iopen_connect_dentry(dentry, old_inode, 0));
 398         }
 399
 400         SMFS_POST_HOOK(dir, HOOK_LINK, &msg, rc);
 401
 402         post_smfs_inode(old_inode, cache_old_inode);
 403         post_smfs_inode(dir, cache_dir);
 404
 405         smfs_trans_commit(dir, handle, 0);
 406
 407 exit:
 408         //unlock_kernel();
 409         post_smfs_dentry(cache_dentry);
 410         post_smfs_dentry(cache_parent);
 411         post_smfs_dentry(cache_old_dentry);
 412
 413         RETURN(rc);
 414 }
 415
 416 static int smfs_unlink(struct inode * dir, struct dentry *dentry)
 417 {
 418         struct inode *cache_dir = I2CI(dir);
 419         struct inode *cache_inode = I2CI(dentry->d_inode);
 420         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 421         struct dentry *cache_dentry = NULL;
 422         struct dentry *cache_parent = NULL;
 423         void   *handle = NULL;
 424         int    rc = 0;
 425         //int    mode = 0;
 426         struct hook_unlink_msg msg = {
 427                 .dentry = dentry,
 428                 .mode = dentry->d_inode->i_mode
 429         };
 430
 431         ENTRY;
 432
 433         LASSERT(cache_dir);
 434         LASSERT(cache_inode);
 435         LASSERT(cache_dir->i_op->unlink);
 436         LASSERT(parent);
 437
 438         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 439                dentry->d_name.len, dentry->d_name.name, dentry,
 440                dir->i_ino, dir->i_generation);
 441
 442         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 443         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 444         if (!cache_dentry || !cache_parent) {
 445                 rc = -ENOMEM;
 446                 goto exit;
 447         }
 448
 449         handle = smfs_trans_start(dir, FSFILT_OP_UNLINK, NULL);
 450         if (IS_ERR(handle)) {
 451                 rc = -ENOSPC;
 452                 goto exit;
 453         }
 454
 455         pre_smfs_inode(dir, cache_dir);
 456         pre_smfs_inode(dentry->d_inode, cache_inode);
 457
 458         SMFS_PRE_HOOK(dir, HOOK_UNLINK, &msg);
 459
 460         rc = cache_dir->i_op->unlink(cache_dir, cache_dentry);
 461
 462         SMFS_POST_HOOK(dir, HOOK_UNLINK, &msg, rc);
 463         if (!rc) {
 464                 post_smfs_inode(dentry->d_inode, cache_inode);
 465                 dentry->d_inode->i_nlink--;
 466                 post_smfs_inode(dir, cache_dir);
 467         }
 468
 469         smfs_trans_commit(dir, handle, 0);
 470 exit:
 471         post_smfs_dentry(cache_dentry);
 472         post_smfs_dentry(cache_parent);
 473         RETURN(rc);
 474 }
 475
 476 static int smfs_symlink(struct inode *dir, struct dentry *dentry,
 477                         const char *symname)
 478 {
 479         struct inode *cache_dir = I2CI(dir);
 480         struct inode *inode = NULL;
 481         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 482         struct dentry *cache_dentry = NULL;
 483         struct dentry *cache_parent = NULL;
 484         void   *handle = NULL;
 485         int    rc = 0;
 486         struct hook_symlink_msg msg = {
 487                 .dentry = dentry,
 488                 .tgt_len = strlen(symname) + 1,
 489                 .symname = (char*)symname
 490         };
 491
 492         ENTRY;
 493
 494         LASSERT(cache_dir);
 495         LASSERT(cache_dir->i_op->symlink);
 496         LASSERT(parent);
 497
 498         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 499         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 500         if (!cache_parent || !cache_dentry) {
 501                 rc = -ENOMEM;
 502                 goto exit;
 503         }
 504
 505         handle = smfs_trans_start(dir, FSFILT_OP_SYMLINK, NULL);
 506         if (IS_ERR(handle)) {
 507                 rc = -ENOSPC;
 508                 goto exit;
 509         }
 510
 511         pre_smfs_inode(dir, cache_dir);
 512
 513         SMFS_PRE_HOOK(dir, HOOK_SYMLINK, &msg);
 514
 515         rc = cache_dir->i_op->symlink(cache_dir, cache_dentry, symname);
 516         if (!rc) {
 517                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 518                                        I2SMI(dir), 0);
 519                 if (inode) {
 520                         d_instantiate(dentry, inode);
 521                 }
 522                 else
 523                         rc = -ENOENT;
 524         }
 525
 526         SMFS_POST_HOOK(dir, HOOK_SYMLINK, &msg, rc);
 527
 528         post_smfs_inode(dir, cache_dir);
 529         smfs_trans_commit(dir, handle, 0);
 530
 531 exit:
 532         post_smfs_dentry(cache_dentry);
 533         post_smfs_dentry(cache_parent);
 534         RETURN(rc);
 535 }
 536
 537 static int smfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 538 {
 539         struct inode *cache_dir = I2CI(dir);
 540         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 541         struct inode *inode = NULL;
 542         struct dentry *cache_dentry = NULL;
 543         struct dentry *cache_parent = NULL;
 544         void   *handle = NULL;
 545         int    rc = 0;
 546         struct hook_msg msg = {
 547                 .dentry = dentry,
 548         };
 549
 550         ENTRY;
 551
 552         LASSERT(cache_dir);
 553         LASSERT(parent);
 554
 555         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 556                dentry->d_name.len, dentry->d_name.name, dentry,
 557                dir->i_ino, dir->i_generation);
 558
 559         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 560         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 561         if (!cache_parent || !cache_dentry) {
 562                 rc = -ENOMEM;
 563                 goto exit;
 564         }
 565
 566         handle = smfs_trans_start(dir, FSFILT_OP_MKDIR, NULL);
 567         if (IS_ERR(handle)) {
 568                 rc = -ENOSPC;
 569                 goto exit;
 570         }
 571
 572         pre_smfs_inode(dir, cache_dir);
 573         SMFS_PRE_HOOK(dir, HOOK_MKDIR, &msg);
 574
 575         rc = cache_dir->i_op->mkdir(cache_dir, cache_dentry, mode);
 576         if (!rc) {
 577                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 578                                        I2SMI(dir), 0);
 579                 if (inode) {
 580                         dir->i_nlink++;
 581                         d_instantiate(dentry, inode);
 582                 }
 583                 else
 584                         rc = -ENOENT;
 585         }
 586
 587         SMFS_POST_HOOK(dir, HOOK_MKDIR, &msg, rc);
 588         post_smfs_inode(dir, cache_dir);
 589         smfs_trans_commit(dir, handle, 0);
 590
 591 exit:
 592         post_smfs_dentry(cache_dentry);
 593         post_smfs_dentry(cache_parent);
 594         RETURN(rc);
 595 }
 596
 597 static int smfs_rmdir(struct inode *dir, struct dentry *dentry)
 598 {
 599         struct inode *cache_dir = I2CI(dir);
 600         struct inode *cache_inode = I2CI(dentry->d_inode);
 601         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 602         struct dentry *cache_dentry = NULL;
 603         struct dentry *cache_parent = NULL;
 604         struct inode * inode = dentry->d_inode;
 605         void *handle = NULL;
 606         int    rc = 0;
 607         struct hook_unlink_msg msg = {
 608                 .dentry = dentry,
 609                 .mode = S_IFDIR
 610         };
 611
 612         ENTRY;
 613
 614         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 615                dentry->d_name.len, dentry->d_name.name, dentry,
 616                dir->i_ino, dir->i_generation);
 617
 618         LASSERT(cache_dir);
 619         LASSERT(cache_dir->i_op->rmdir);
 620         LASSERT(parent);
 621
 622         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 623         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 624         if (!cache_parent || !cache_dentry) {
 625                 rc = -ENOMEM;
 626                 goto exit;
 627         }
 628
 629         handle = smfs_trans_start(dir, FSFILT_OP_RMDIR, NULL);
 630         if (IS_ERR(handle) ) {
 631                 rc = -ENOSPC;
 632                 goto exit;
 633         }
 634
 635         dentry_unhash(cache_dentry);
 636
 637         pre_smfs_inode(dir, cache_dir);
 638         pre_smfs_inode(inode, cache_inode);
 639
 640         SMFS_PRE_HOOK(dir, HOOK_RMDIR, &msg);
 641
 642         rc = cache_dir->i_op->rmdir(cache_dir, cache_dentry);
 643
 644         SMFS_POST_HOOK(dir, HOOK_RMDIR, &msg, rc);
 645         if (!rc) {
 646                 if (inode->i_nlink != 2)
 647                         CWARN("Directory #%lu under rmdir has %i nlinks\n",
 648                                 inode->i_ino, inode->i_nlink);
 649                 inode->i_nlink = 0;
 650                 dir->i_nlink--;
 651                 post_smfs_inode(dir, cache_dir);
 652                 post_smfs_inode(inode, cache_inode);
 653                 //like vfs_rmdir is doing with inode
 654                 cache_inode->i_flags |= S_DEAD;
 655         }
 656         smfs_trans_commit(dir, handle, 0);
 657         dput(cache_dentry);
 658 exit:
 659         post_smfs_dentry(cache_dentry);
 660         post_smfs_dentry(cache_parent);
 661         RETURN(rc);
 662 }
 663
 664 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 665 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 666                       int mode, int rdev)
 667 #else
 668 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 669                       int mode, dev_t rdev)
 670 #endif
 671 {
 672         struct inode *cache_dir = I2CI(dir);
 673         struct inode *inode = NULL;
 674         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 675         struct dentry *cache_dentry = NULL;
 676         struct dentry *cache_parent = NULL;
 677         void *handle = NULL;
 678         int rc = 0;
 679         struct hook_msg msg = {
 680                 .dentry = dentry,
 681         };
 682
 683         ENTRY;
 684
 685         LASSERT(parent);
 686         LASSERT(cache_dir);
 687         LASSERT(cache_dir->i_op->mknod);
 688
 689         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 690         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 691         if (!cache_parent || !cache_dentry) {
 692                 rc = -ENOMEM;
 693                 goto exit;
 694         }
 695
 696         handle = smfs_trans_start(dir, FSFILT_OP_MKNOD, NULL);
 697         if (IS_ERR(handle)) {
 698                 rc = -ENOSPC;
 699                 goto exit;
 700         }
 701
 702         pre_smfs_inode(dir, cache_dir);
 703
 704         SMFS_PRE_HOOK(dir, HOOK_MKNOD, &msg);
 705
 706         rc = cache_dir->i_op->mknod(cache_dir, cache_dentry, mode, rdev);
 707         if (!rc) {
 708                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 709                                        I2SMI(dir), 0);
 710                 if (inode) {
 711                         //smsf_update_dentry(dentry, cache_dentry);
 712                         d_instantiate(dentry, inode);
 713                 }
 714                 else
 715                         rc = -ENOENT;
 716         }
 717
 718         SMFS_POST_HOOK(dir, HOOK_MKNOD, &msg, rc);
 719
 720         post_smfs_inode(dir, cache_dir);
 721
 722         smfs_trans_commit(dir, handle, 0);
 723
 724 exit:
 725         post_smfs_dentry(cache_dentry);
 726         post_smfs_dentry(cache_parent);
 727         RETURN(rc);
 728 }
 729
 730 static int smfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 731                        struct inode *new_dir,struct dentry *new_dentry)
 732 {
 733         struct inode *cache_old_dir = I2CI(old_dir);
 734         struct inode *cache_new_dir = I2CI(new_dir);
 735         struct inode *new_inode = new_dentry->d_inode;
 736         struct inode *cache_old_inode = I2CI(old_dentry->d_inode);
 737         struct inode *old_parent = I2CI(old_dentry->d_parent->d_inode);
 738         struct inode *new_parent = I2CI(new_dentry->d_parent->d_inode);
 739         struct inode *cache_new_inode = NULL;
 740         struct dentry *cache_old_dentry = NULL;
 741         struct dentry *cache_new_dentry = NULL;
 742         struct dentry *cache_new_parent = NULL;
 743         struct dentry *cache_old_parent = NULL;
 744         void *handle = NULL;
 745         int    rc = 0;
 746         struct hook_rename_msg msg = {
 747                 .dentry = old_dentry,
 748                 .new_dir = new_dir,
 749                 .old_dir = old_dir,
 750                 .new_dentry = new_dentry,
 751         };
 752
 753         ENTRY;
 754
 755         if (!cache_old_dir || !cache_new_dir || !cache_old_inode)
 756                 RETURN(-ENOENT);
 757
 758         if (new_inode) {
 759                 cache_new_inode = I2CI(new_inode);
 760                 if (!cache_new_inode)
 761                         RETURN(-ENOENT);
 762         }
 763
 764         cache_old_parent = pre_smfs_dentry(NULL, old_parent, old_dentry->d_parent);
 765         cache_old_dentry = pre_smfs_dentry(cache_old_parent, cache_old_inode,
 766                                            old_dentry);
 767         if (!cache_old_parent || !cache_old_dentry) {
 768                 rc = -ENOMEM;
 769                 goto exit;
 770         }
 771
 772         cache_new_parent = pre_smfs_dentry(NULL, new_parent, new_dentry->d_parent);
 773         cache_new_dentry = pre_smfs_dentry(cache_new_parent, cache_new_inode,
 774                                            new_dentry);
 775         if (!cache_new_parent || !cache_new_dentry) {
 776                 rc = -ENOMEM;
 777                 goto exit;
 778         }
 779
 780         handle = smfs_trans_start(old_dir, FSFILT_OP_RENAME, NULL);
 781         if (IS_ERR(handle)) {
 782                 rc = -ENOSPC;
 783                 goto exit;
 784         }
 785
 786         pre_smfs_inode(old_dir, cache_old_dir);
 787         pre_smfs_inode(new_dir, cache_new_dir);
 788         pre_smfs_inode(old_dentry->d_inode, cache_old_inode);
 789         if (new_inode)
 790                 pre_smfs_inode(new_inode, cache_new_inode);
 791
 792         SMFS_PRE_HOOK(old_dir, HOOK_RENAME, &msg);
 793
 794         rc = cache_old_dir->i_op->rename(cache_old_dir, cache_old_dentry,
 795                                          cache_new_dir, cache_new_dentry);
 796
 797         SMFS_POST_HOOK(old_dir, HOOK_RENAME, &msg, rc);
 798         if (!rc) {
 799                 post_smfs_inode(old_dir, cache_old_dir);
 800                 post_smfs_inode(new_dir, cache_new_dir);
 801                 post_smfs_inode(old_dentry->d_inode, cache_old_inode);
 802                 if (new_inode) {
 803                         post_smfs_inode(new_inode, cache_new_inode);
 804                         new_inode->i_nlink--;
 805                 }
 806                 //directory is renamed
 807                 if (S_ISDIR(old_dentry->d_inode->i_mode)) {
 808                         old_dir->i_nlink--;
 809                         if (new_inode) {
 810                                 new_inode->i_nlink--;
 811                         } else {
 812                                 new_dir->i_nlink++;
 813                         }
 814                 }
 815         }
 816         smfs_trans_commit(old_dir, handle, 0);
 817
 818 exit:
 819         post_smfs_dentry(cache_old_dentry);
 820         post_smfs_dentry(cache_old_parent);
 821         post_smfs_dentry(cache_new_dentry);
 822         post_smfs_dentry(cache_new_parent);
 823         RETURN(rc);
 824 }
 825
 826 struct inode_operations smfs_dir_iops = {
 827         .create         = smfs_create,
 828         .lookup         = smfs_lookup,
 829 #if HAVE_LOOKUP_RAW
 830         .lookup_raw     = smfs_lookup_raw,
 831 #endif
 832         .link           = smfs_link,
 833         .unlink         = smfs_unlink,
 834         .symlink        = smfs_symlink,
 835         .mkdir          = smfs_mkdir,
 836         .rmdir          = smfs_rmdir,
 837         .mknod          = smfs_mknod,
 838         .rename         = smfs_rename,
 839         .setxattr       = smfs_setxattr,
 840         .getxattr       = smfs_getxattr,
 841         .listxattr      = smfs_listxattr,
 842         .removexattr    = smfs_removexattr,
 843         .permission     = smfs_permission,
 844 };
 845
 846 struct inode_operations smfs_iopen_iops = {
 847         .lookup         = smfs_iopen_lookup,
 848 };
 849
 850 static ssize_t smfs_read_dir(struct file *filp, char *buf,
 851                              size_t size, loff_t *ppos)
 852 {
 853         struct dentry *dentry = filp->f_dentry;
 854         struct inode *cache_inode = NULL;
 855         struct smfs_file_info *sfi = NULL;
 856         loff_t tmp_ppos;
 857         loff_t *cache_ppos = NULL;
 858         int    rc = 0;
 859
 860         ENTRY;
 861
 862         cache_inode = I2CI(dentry->d_inode);
 863
 864         if (!cache_inode || !cache_inode->i_fop->read)
 865                 RETURN(-EINVAL);
 866
 867         sfi = F2SMFI(filp);
 868         if (sfi->magic != SMFS_FILE_MAGIC)
 869                 BUG();
 870
 871         if (ppos != &(filp->f_pos))
 872                 cache_ppos = &tmp_ppos;
 873         else
 874                 cache_ppos = &sfi->c_file->f_pos;
 875
 876         *cache_ppos = *ppos;
 877
 878         rc = cache_inode->i_fop->read(sfi->c_file, buf, size, cache_ppos);
 879         if (rc)
 880                 RETURN(rc);
 881
 882         *ppos = *cache_ppos;
 883
 884         duplicate_file(filp, sfi->c_file);
 885
 886         RETURN(rc);
 887 }
 888
 889 static int smfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 890 {
 891         struct dentry *dentry = filp->f_dentry;
 892         struct inode *cache_inode = NULL;
 893         struct smfs_file_info *sfi = NULL;
 894         int    rc = 0;
 895
 896         ENTRY;
 897
 898         cache_inode = I2CI(dentry->d_inode);
 899         if (!cache_inode || !cache_inode->i_fop->readdir)
 900                 RETURN(-EINVAL);
 901
 902         sfi = F2SMFI(filp);
 903         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 904
 905         rc = cache_inode->i_fop->readdir(sfi->c_file, dirent, filldir);
 906
 907         duplicate_file(filp, sfi->c_file);
 908
 909         RETURN(rc);
 910 }
 911
 912 struct file_operations smfs_dir_fops = {
 913         .read           = smfs_read_dir,
 914         .readdir        = smfs_readdir,       /* BKL held */
 915         .ioctl          = smfs_ioctl,         /* BKL held */
 916         .fsync          = smfs_fsync,         /* BKL held */
 917         .open           = smfs_open,
 918         .release        = smfs_release,
 919 };
 920
 921 struct file_operations smfs_iopen_fops = {
 922         .read           = smfs_read_dir,
 923 };
 924