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                 dput(iopen_connect_dentry(dentry, old_inode, 0));
 379         }
 380
 381         SMFS_POST_HOOK(dir, HOOK_LINK, &msg, rc);
 382
 383         post_smfs_inode(old_inode, cache_old_inode);
 384         post_smfs_inode(dir, cache_dir);
 385
 386         smfs_trans_commit(dir, handle, 0);
 387
 388 exit:
 389         //unlock_kernel();
 390         post_smfs_dentry(cache_dentry);
 391         post_smfs_dentry(cache_parent);
 392         post_smfs_dentry(cache_old_dentry);
 393
 394         RETURN(rc);
 395 }
 396
 397 static int smfs_unlink(struct inode * dir, struct dentry *dentry)
 398 {
 399         struct inode *cache_dir = I2CI(dir);
 400         struct inode *cache_inode = I2CI(dentry->d_inode);
 401         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 402         struct dentry *cache_dentry = NULL;
 403         struct dentry *cache_parent = NULL;
 404         void   *handle = NULL;
 405         int    rc = 0;
 406         //int    mode = 0;
 407         struct hook_unlink_msg msg = {
 408                 .dentry = dentry,
 409                 .mode = dentry->d_inode->i_mode
 410         };
 411
 412         ENTRY;
 413
 414         LASSERT(cache_dir);
 415         LASSERT(cache_inode);
 416         LASSERT(cache_dir->i_op->unlink);
 417         LASSERT(parent);
 418
 419         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 420         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 421         if (!cache_dentry || !cache_parent) {
 422                 rc = -ENOMEM;
 423                 goto exit;
 424         }
 425
 426         handle = smfs_trans_start(dir, FSFILT_OP_UNLINK, NULL);
 427         if (IS_ERR(handle)) {
 428                 rc = -ENOSPC;
 429                 goto exit;
 430         }
 431
 432         pre_smfs_inode(dir, cache_dir);
 433         pre_smfs_inode(dentry->d_inode, cache_inode);
 434
 435         SMFS_PRE_HOOK(dir, HOOK_UNLINK, &msg);
 436
 437         rc = cache_dir->i_op->unlink(cache_dir, cache_dentry);
 438
 439         SMFS_POST_HOOK(dir, HOOK_UNLINK, &msg, rc);
 440
 441         post_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 442         post_smfs_inode(dir, cache_dir);
 443
 444         smfs_trans_commit(dir, handle, 0);
 445 exit:
 446         post_smfs_dentry(cache_dentry);
 447         post_smfs_dentry(cache_parent);
 448         RETURN(rc);
 449 }
 450
 451 static int smfs_symlink(struct inode *dir, struct dentry *dentry,
 452                         const char *symname)
 453 {
 454         struct inode *cache_dir = I2CI(dir);
 455         struct inode *inode = NULL;
 456         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 457         struct dentry *cache_dentry = NULL;
 458         struct dentry *cache_parent = NULL;
 459         void   *handle = NULL;
 460         int    rc = 0;
 461         struct hook_symlink_msg msg = {
 462                 .dentry = dentry,
 463                 .tgt_len = strlen(symname) + 1,
 464                 .symname = (char*)symname
 465         };
 466
 467         ENTRY;
 468
 469         LASSERT(cache_dir);
 470         LASSERT(cache_dir->i_op->symlink);
 471         LASSERT(parent);
 472
 473         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 474         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 475         if (!cache_parent || !cache_dentry) {
 476                 rc = -ENOMEM;
 477                 goto exit;
 478         }
 479
 480         handle = smfs_trans_start(dir, FSFILT_OP_SYMLINK, NULL);
 481         if (IS_ERR(handle)) {
 482                 rc = -ENOSPC;
 483                 goto exit;
 484         }
 485
 486         pre_smfs_inode(dir, cache_dir);
 487
 488         SMFS_PRE_HOOK(dir, HOOK_SYMLINK, &msg);
 489
 490         rc = cache_dir->i_op->symlink(cache_dir, cache_dentry, symname);
 491         if (!rc) {
 492                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 493                                        I2SMI(dir), 0);
 494                 if (inode) {
 495                         d_instantiate(dentry, inode);
 496                 }
 497                 else
 498                         rc = -ENOENT;
 499         }
 500
 501         SMFS_POST_HOOK(dir, HOOK_SYMLINK, &msg, rc);
 502
 503         post_smfs_inode(dir, cache_dir);
 504         smfs_trans_commit(dir, handle, 0);
 505
 506 exit:
 507         post_smfs_dentry(cache_dentry);
 508         post_smfs_dentry(cache_parent);
 509         RETURN(rc);
 510 }
 511
 512 static int smfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 513 {
 514         struct inode *cache_dir = I2CI(dir);
 515         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 516         struct inode *inode = NULL;
 517         struct dentry *cache_dentry = NULL;
 518         struct dentry *cache_parent = NULL;
 519         void   *handle = NULL;
 520         int    rc = 0;
 521         struct hook_msg msg = {
 522                 .dentry = dentry,
 523         };
 524
 525         ENTRY;
 526
 527         LASSERT(cache_dir);
 528         LASSERT(parent);
 529
 530         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 531         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 532         if (!cache_parent || !cache_dentry) {
 533                 rc = -ENOMEM;
 534                 goto exit;
 535         }
 536
 537         handle = smfs_trans_start(dir, FSFILT_OP_MKDIR, NULL);
 538         if (IS_ERR(handle)) {
 539                 rc = -ENOSPC;
 540                 goto exit;
 541         }
 542
 543         pre_smfs_inode(dir, cache_dir);
 544         SMFS_PRE_HOOK(dir, HOOK_MKDIR, &msg);
 545
 546         rc = cache_dir->i_op->mkdir(cache_dir, cache_dentry, mode);
 547         if (!rc) {
 548                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 549                                        I2SMI(dir), 0);
 550                 if (inode) {
 551                         //smsf_update_dentry(dentry, cache_dentry);
 552                         d_instantiate(dentry, inode);
 553                 }
 554                 else
 555                         rc = -ENOENT;
 556         }
 557
 558         SMFS_POST_HOOK(dir, HOOK_MKDIR, &msg, rc);
 559         post_smfs_inode(dir, cache_dir);
 560         smfs_trans_commit(dir, handle, 0);
 561
 562 exit:
 563         post_smfs_dentry(cache_dentry);
 564         post_smfs_dentry(cache_parent);
 565         RETURN(rc);
 566 }
 567
 568 static int smfs_rmdir(struct inode *dir, struct dentry *dentry)
 569 {
 570         struct inode *cache_dir = I2CI(dir);
 571         struct inode *cache_inode = I2CI(dentry->d_inode);
 572         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 573         struct dentry *cache_dentry = NULL;
 574         struct dentry *cache_parent = NULL;
 575         void *handle = NULL;
 576         int    rc = 0;
 577         struct hook_unlink_msg msg = {
 578                 .dentry = dentry,
 579                 .mode = S_IFDIR
 580         };
 581
 582         ENTRY;
 583
 584         LASSERT(cache_dir);
 585         LASSERT(cache_dir->i_op->rmdir);
 586         LASSERT(parent);
 587
 588         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 589         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 590         if (!cache_parent || !cache_dentry) {
 591                 rc = -ENOMEM;
 592                 goto exit;
 593         }
 594
 595         handle = smfs_trans_start(dir, FSFILT_OP_RMDIR, NULL);
 596         if (IS_ERR(handle) ) {
 597                 rc = -ENOSPC;
 598                 goto exit;
 599         }
 600
 601         pre_smfs_inode(dir, cache_dir);
 602         pre_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 603
 604         SMFS_PRE_HOOK(dir, HOOK_RMDIR, &msg);
 605
 606         rc = cache_dir->i_op->rmdir(cache_dir, cache_dentry);
 607
 608         SMFS_POST_HOOK(dir, HOOK_RMDIR, &msg, rc);
 609
 610         post_smfs_inode(dir, cache_dir);
 611         post_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 612         //like vfs_rmdir is doing with inode
 613         if (!rc)
 614                 cache_dentry->d_inode->i_flags |= S_DEAD;
 615
 616         smfs_trans_commit(dir, handle, 0);
 617
 618 exit:
 619         post_smfs_dentry(cache_dentry);
 620         post_smfs_dentry(cache_parent);
 621         RETURN(rc);
 622 }
 623
 624 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 625 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 626                       int mode, int rdev)
 627 #else
 628 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 629                       int mode, dev_t rdev)
 630 #endif
 631 {
 632         struct inode *cache_dir = I2CI(dir);
 633         struct inode *inode = NULL;
 634         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 635         struct dentry *cache_dentry = NULL;
 636         struct dentry *cache_parent = NULL;
 637         void *handle = NULL;
 638         int rc = 0;
 639         struct hook_msg msg = {
 640                 .dentry = dentry,
 641         };
 642
 643         ENTRY;
 644
 645         LASSERT(parent);
 646         LASSERT(cache_dir);
 647         LASSERT(cache_dir->i_op->mknod);
 648
 649         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 650         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 651         if (!cache_parent || !cache_dentry) {
 652                 rc = -ENOMEM;
 653                 goto exit;
 654         }
 655
 656         handle = smfs_trans_start(dir, FSFILT_OP_MKNOD, NULL);
 657         if (IS_ERR(handle)) {
 658                 rc = -ENOSPC;
 659                 goto exit;
 660         }
 661
 662         pre_smfs_inode(dir, cache_dir);
 663
 664         SMFS_PRE_HOOK(dir, HOOK_MKNOD, &msg);
 665
 666         rc = cache_dir->i_op->mknod(cache_dir, cache_dentry, mode, rdev);
 667         if (!rc) {
 668                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 669                                        I2SMI(dir), 0);
 670                 if (inode) {
 671                         //smsf_update_dentry(dentry, cache_dentry);
 672                         d_instantiate(dentry, inode);
 673                 }
 674                 else
 675                         rc = -ENOENT;
 676         }
 677
 678         SMFS_POST_HOOK(dir, HOOK_MKNOD, &msg, rc);
 679
 680         post_smfs_inode(dir, cache_dir);
 681
 682         smfs_trans_commit(dir, handle, 0);
 683
 684 exit:
 685         post_smfs_dentry(cache_dentry);
 686         post_smfs_dentry(cache_parent);
 687         RETURN(rc);
 688 }
 689
 690 static int smfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 691                        struct inode *new_dir,struct dentry *new_dentry)
 692 {
 693         struct inode *cache_old_dir = I2CI(old_dir);
 694         struct inode *cache_new_dir = I2CI(new_dir);
 695         struct inode *cache_old_inode = I2CI(old_dentry->d_inode);
 696         struct inode *old_parent = I2CI(old_dentry->d_parent->d_inode);
 697         struct inode *new_parent = I2CI(new_dentry->d_parent->d_inode);
 698         struct inode *cache_new_inode = NULL;
 699         struct dentry *cache_old_dentry = NULL;
 700         struct dentry *cache_new_dentry = NULL;
 701         struct dentry *cache_new_parent = NULL;
 702         struct dentry *cache_old_parent = NULL;
 703         void *handle = NULL;
 704         int    rc = 0;
 705         struct hook_rename_msg msg = {
 706                 .dentry = old_dentry,
 707                 .new_dir = new_dir,
 708                 .new_dentry = new_dentry
 709         };
 710
 711         ENTRY;
 712
 713         if (!cache_old_dir || !cache_new_dir || !cache_old_inode)
 714                 RETURN(-ENOENT);
 715
 716         if (new_dentry->d_inode) {
 717                 cache_new_inode = I2CI(new_dentry->d_inode);
 718                 if (!cache_new_inode)
 719                         RETURN(-ENOENT);
 720         }
 721
 722         cache_old_parent = pre_smfs_dentry(NULL, old_parent, old_dentry->d_parent);
 723         cache_old_dentry = pre_smfs_dentry(cache_old_parent, cache_old_inode,
 724                                            old_dentry);
 725         if (!cache_old_parent || !cache_old_dentry) {
 726                 rc = -ENOMEM;
 727                 goto exit;
 728         }
 729
 730         cache_new_parent = pre_smfs_dentry(NULL, new_parent, new_dentry->d_parent);
 731         cache_new_dentry = pre_smfs_dentry(cache_new_parent, cache_new_inode,
 732                                            new_dentry);
 733         if (!cache_new_parent || !cache_new_dentry) {
 734                 rc = -ENOMEM;
 735                 goto exit;
 736         }
 737
 738         handle = smfs_trans_start(old_dir, FSFILT_OP_RENAME, NULL);
 739         if (IS_ERR(handle)) {
 740                 rc = -ENOSPC;
 741                 goto exit;
 742         }
 743
 744         pre_smfs_inode(old_dir, cache_old_dir);
 745         pre_smfs_inode(new_dir, cache_new_dir);
 746         if (new_dentry->d_inode)
 747                 pre_smfs_inode(new_dentry->d_inode, cache_new_dentry->d_inode);
 748
 749         SMFS_PRE_HOOK(old_dir, HOOK_RENAME, &msg);
 750
 751         rc = cache_old_dir->i_op->rename(cache_old_dir, cache_old_dentry,
 752                                          cache_new_dir, cache_new_dentry);
 753
 754         SMFS_POST_HOOK(old_dir, HOOK_RENAME, &msg, rc);
 755
 756         post_smfs_inode(old_dir, cache_old_dir);
 757         post_smfs_inode(new_dir, cache_new_dir);
 758         if (new_dentry->d_inode)
 759                 post_smfs_inode(new_dentry->d_inode, cache_new_dentry->d_inode);
 760
 761         smfs_trans_commit(old_dir, handle, 0);
 762
 763 exit:
 764         post_smfs_dentry(cache_old_dentry);
 765         post_smfs_dentry(cache_old_parent);
 766         post_smfs_dentry(cache_new_dentry);
 767         post_smfs_dentry(cache_new_parent);
 768         RETURN(rc);
 769 }
 770
 771 struct inode_operations smfs_dir_iops = {
 772         create:         smfs_create,
 773         lookup:         smfs_lookup,
 774 #if HAVE_LOOKUP_RAW
 775         lookup_raw:     smfs_lookup_raw,
 776 #endif
 777         link:           smfs_link,              /* BKL held */
 778         unlink:         smfs_unlink,            /* BKL held */
 779         symlink:        smfs_symlink,           /* BKL held */
 780         mkdir:          smfs_mkdir,             /* BKL held */
 781         rmdir:          smfs_rmdir,             /* BKL held */
 782         mknod:          smfs_mknod,             /* BKL held */
 783         rename:         smfs_rename,            /* BKL held */
 784         setxattr:       smfs_setxattr,          /* BKL held */
 785         getxattr:       smfs_getxattr,          /* BKL held */
 786         listxattr:      smfs_listxattr,         /* BKL held */
 787         removexattr:    smfs_removexattr,       /* BKL held */
 788 };
 789
 790 struct inode_operations smfs_iopen_iops = {
 791         lookup:         smfs_iopen_lookup,
 792 };
 793
 794 static ssize_t smfs_read_dir(struct file *filp, char *buf,
 795                              size_t size, loff_t *ppos)
 796 {
 797         struct dentry *dentry = filp->f_dentry;
 798         struct inode *cache_inode = NULL;
 799         struct smfs_file_info *sfi = NULL;
 800         loff_t tmp_ppos;
 801         loff_t *cache_ppos = NULL;
 802         int    rc = 0;
 803
 804         ENTRY;
 805
 806         cache_inode = I2CI(dentry->d_inode);
 807
 808         if (!cache_inode || !cache_inode->i_fop->read)
 809                 RETURN(-EINVAL);
 810
 811         sfi = F2SMFI(filp);
 812         if (sfi->magic != SMFS_FILE_MAGIC)
 813                 BUG();
 814
 815         if (ppos != &(filp->f_pos))
 816                 cache_ppos = &tmp_ppos;
 817         else
 818                 cache_ppos = &sfi->c_file->f_pos;
 819
 820         *cache_ppos = *ppos;
 821
 822         rc = cache_inode->i_fop->read(sfi->c_file, buf, size, cache_ppos);
 823         if (rc)
 824                 RETURN(rc);
 825
 826         *ppos = *cache_ppos;
 827
 828         duplicate_file(filp, sfi->c_file);
 829
 830         RETURN(rc);
 831 }
 832
 833 static int smfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 834 {
 835         struct dentry *dentry = filp->f_dentry;
 836         struct inode *cache_inode = NULL;
 837         struct smfs_file_info *sfi = NULL;
 838         int    rc = 0;
 839         struct hook_readdir_msg msg = {
 840                 .dentry = dentry,
 841                 .filp = filp,
 842                 .dirent = dirent,
 843                 .filldir = filldir
 844         };
 845
 846         ENTRY;
 847
 848         cache_inode = I2CI(dentry->d_inode);
 849         if (!cache_inode || !cache_inode->i_fop->readdir)
 850                 RETURN(-EINVAL);
 851
 852         sfi = F2SMFI(filp);
 853         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 854
 855         SMFS_PRE_HOOK(dentry->d_inode, HOOK_READDIR, &msg);
 856
 857         rc = cache_inode->i_fop->readdir(sfi->c_file, dirent, filldir);
 858
 859         SMFS_POST_HOOK(dentry->d_inode, HOOK_READDIR, &msg, rc);
 860         duplicate_file(filp, sfi->c_file);
 861
 862         RETURN(rc);
 863 }
 864
 865 struct file_operations smfs_dir_fops = {
 866         .read           = smfs_read_dir,
 867         .readdir        = smfs_readdir,       /* BKL held */
 868         .ioctl          = smfs_ioctl,         /* BKL held */
 869         .fsync          = smfs_fsync,         /* BKL held */
 870         .open           = smfs_open,
 871         .release        = smfs_release,
 872 };
 873
 874 struct file_operations smfs_iopen_fops = {
 875         .read           = smfs_read_dir,
 876 };
 877