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