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