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