lustre/smfs/dir.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2004 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #define DEBUG_SUBSYSTEM S_SM
  24
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/string.h>
  28 #include <linux/slab.h>
  29 #include <linux/stat.h>
  30 #include <linux/unistd.h>
  31 #include <linux/smp_lock.h>
  32 #include <linux/obd_class.h>
  33 #include <linux/obd_support.h>
  34 #include <linux/lustre_lib.h>
  35 #include <linux/lustre_idl.h>
  36 #include <linux/lustre_fsfilt.h>
  37 #include <linux/lustre_smfs.h>
  38 #include <linux/lustre_snap.h>
  39 #include <linux/security.h>
  40 #include "smfs_internal.h"
  41
  42 //#define NAME_ALLOC_LEN(len)     ((len+16) & ~15)
  43
  44 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  45 static int smfs_create(struct inode *dir, struct dentry *dentry,
  46                        int mode)
  47 #else
  48 static int smfs_create(struct inode *dir, struct dentry *dentry,
  49                        int mode, struct nameidata *nd)
  50 #endif
  51 {
  52         struct inode *inode = NULL;
  53         struct inode *parent = I2CI(dentry->d_parent->d_inode);
  54         struct inode *cache_dir = I2CI(dir);
  55         struct dentry *cache_dentry = NULL;
  56         struct dentry *cache_parent = NULL;
  57         void *handle = NULL;
  58         struct hook_msg msg = {
  59                 .dentry = dentry,
  60         };
  61         int rc = 0;
  62
  63         ENTRY;
  64
  65         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
  66                dentry->d_name.len, dentry->d_name.name, dentry,
  67                dir->i_ino, dir->i_generation);
  68
  69         LASSERT(cache_dir);
  70         LASSERT(cache_dir->i_op->create);
  71
  72         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
  73         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
  74         if (!cache_dentry || !cache_parent) {
  75                 rc = -ENOMEM;
  76                 goto exit;
  77         }
  78
  79         handle = smfs_trans_start(dir, FSFILT_OP_CREATE, NULL);
  80         if (IS_ERR(handle)) {
  81                 rc = -ENOSPC;
  82                 goto exit;
  83         }
  84
  85         SMFS_PRE_HOOK(dir, HOOK_CREATE, &msg);
  86
  87         pre_smfs_inode(dir, cache_dir);
  88
  89 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  90         rc = cache_dir->i_op->create(cache_dir, cache_dentry, mode);
  91 #else
  92         rc = cache_dir->i_op->create(cache_dir, cache_dentry, mode, nd);
  93 #endif
  94         if (!rc) {
  95                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
  96                                        I2SMI(dir), 0);
  97                 if (inode) {
  98                         d_instantiate(dentry, inode);
  99                 }
 100                 else
 101                         rc = -ENOENT;
 102         }
 103
 104         SMFS_POST_HOOK(dir, HOOK_CREATE, &msg, rc);
 105
 106         post_smfs_inode(dir, cache_dir);
 107         smfs_trans_commit(dir, handle, 0);
 108
 109 exit:
 110         post_smfs_dentry(cache_dentry);
 111         post_smfs_dentry(cache_parent);
 112         RETURN(rc);
 113 }
 114
 115 static struct dentry * iopen_connect_dentry(struct dentry * dentry,
 116                                      struct inode *inode, int rehash)
 117 {
 118         struct dentry *tmp, *goal = NULL;
 119         struct list_head *lp;
 120
 121         /* verify this dentry is really new */
 122         LASSERT(dentry->d_inode == NULL);
 123         LASSERT(list_empty(&dentry->d_alias));          /* d_instantiate */
 124         if (rehash)
 125                 LASSERT(d_unhashed(dentry));    /* d_rehash */
 126         LASSERT(list_empty(&dentry->d_subdirs));
 127
 128         spin_lock(&dcache_lock);
 129         if (!inode)
 130                 goto do_rehash;
 131
 132         /* preferrably return a connected dentry */
 133         list_for_each(lp, &inode->i_dentry) {
 134                 tmp = list_entry(lp, struct dentry, d_alias);
 135                 if (tmp->d_flags & DCACHE_DISCONNECTED) {
 136                         LASSERT(tmp->d_alias.next == &inode->i_dentry);
 137                         LASSERT(tmp->d_alias.prev == &inode->i_dentry);
 138                         goal = tmp;
 139                         dget_locked(goal);
 140                         break;
 141                 }
 142         }
 143
 144         if (!goal)
 145                 goto do_instantiate;
 146
 147         /* Move the goal to the de hash queue */
 148         goal->d_flags &= ~ DCACHE_DISCONNECTED;
 149         security_d_instantiate(goal, inode);
 150         __d_rehash(dentry);
 151         __d_move(goal, dentry);
 152         spin_unlock(&dcache_lock);
 153         iput(inode);
 154
 155         RETURN(goal);
 156
 157         /* d_add(), but don't drop dcache_lock before adding dentry to inode */
 158 do_instantiate:
 159         list_add(&dentry->d_alias, &inode->i_dentry);   /* d_instantiate */
 160         dentry->d_inode = inode;
 161 do_rehash:
 162         if (rehash)
 163                 __d_rehash(dentry);
 164         spin_unlock(&dcache_lock);
 165
 166         RETURN(NULL);
 167
 168 }
 169
 170 static int smfs_do_lookup (struct inode * dir,
 171                            struct dentry * dentry,
 172                            struct nameidata *nd,
 173                            struct inode **inode)
 174 {
 175         struct inode *cache_dir = I2CI(dir);
 176         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 177         struct dentry *cache_dentry = NULL;
 178         struct dentry *cache_parent = NULL;
 179         struct dentry *rdentry = NULL, *tmp = NULL;
 180         int rc = 0;
 181         struct hook_msg msg = {
 182                 .dentry = dentry,
 183         };
 184
 185         ENTRY;
 186
 187         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 188                dentry->d_name.len, dentry->d_name.name, dentry,
 189                dir->i_ino, dir->i_generation);
 190
 191         if (!cache_dir)
 192                 RETURN(-ENOENT);
 193
 194         LASSERT(cache_dir->i_op->lookup);
 195
 196         /* preparing artificial backing fs dentries. */
 197         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 198         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 199         if (!cache_dentry || !cache_parent) {
 200                 rc = -ENOMEM;
 201                 goto exit;
 202         }
 203
 204         SMFS_PRE_HOOK(dir, HOOK_LOOKUP, &msg);
 205
 206         /* perform lookup in backing fs. */
 207         rdentry = cache_dir->i_op->lookup(cache_dir, cache_dentry, nd);
 208         if (rdentry) {
 209                 if (IS_ERR(rdentry)) {
 210                         rc = PTR_ERR(rdentry);
 211                         rdentry = NULL;
 212                 } else {
 213                         tmp = rdentry;
 214                 }
 215         } else {
 216                 tmp = cache_dentry;
 217         }
 218
 219         SMFS_POST_HOOK(dir, HOOK_LOOKUP, &msg, rc);
 220
 221         if (tmp) {
 222                 //copy fields if DCACHE_CROSS_REF
 223                 smfs_update_dentry(dentry, tmp);
 224
 225                 if (tmp->d_inode) {
 226                         *inode = smfs_get_inode(dir->i_sb, tmp->d_inode,
 227                                                 I2SMI(dir), 0);
 228                         if (!(*inode))
 229                                 rc = -ENOENT;
 230                         else if (!tmp->d_inode->i_nlink) {
 231                                 struct inode * ind = tmp->d_inode;
 232
 233                                 CDEBUG(D_ERROR, "inode #%lu (%*s) nlink is %i/%i\n",
 234                                                 ind->i_ino, tmp->d_name.len,
 235                                                 tmp->d_name.name, ind->i_nlink,
 236                                                 (*inode)->i_nlink);
 237                                 CDEBUG(D_ERROR, "parent #%lu (%*s) nlink is %i\n",
 238                                                 dir->i_ino, tmp->d_parent->d_name.len,
 239                                                 tmp->d_parent->d_name.name,
 240                                                 cache_dir->i_nlink);
 241                                 CDEBUG(D_ERROR, "i_mode %o, rc = %d\n",
 242                                        ind->i_mode, rc);
 243
 244                                 if (is_bad_inode(ind))
 245                                         CDEBUG(D_ERROR, "bad inode returned %lu/%u\n",
 246                                                ind->i_ino, ind->i_generation);
 247                         }
 248                 }
 249         }
 250
 251         if (rdentry) {
 252                 dput(rdentry);
 253         }
 254
 255 exit:
 256         post_smfs_dentry(cache_dentry);
 257         post_smfs_dentry(cache_parent);
 258
 259         RETURN(rc);
 260 }
 261
 262 static struct dentry * smfs_iopen_lookup(struct inode * dir,
 263                                          struct dentry *dentry,
 264                                          struct nameidata *nd)
 265 {
 266         struct dentry * alternate = NULL;
 267         struct inode *inode = NULL;
 268         int rc = 0;
 269         ENTRY;
 270
 271         rc = smfs_do_lookup(dir, dentry, nd, &inode);
 272         if (rc)
 273                 RETURN(ERR_PTR(rc));
 274
 275         LASSERT(inode);
 276         /* preferrably return a connected dentry */
 277         spin_lock(&dcache_lock);
 278         list_for_each_entry(alternate, &inode->i_dentry, d_alias) {
 279                 LASSERT(!(alternate->d_flags & DCACHE_DISCONNECTED));
 280         }
 281
 282         list_for_each_entry(alternate, &inode->i_dentry, d_alias) {
 283                 dget_locked(alternate);
 284                 spin_lock(&alternate->d_lock);
 285                 alternate->d_flags |= DCACHE_REFERENCED;
 286                 spin_unlock(&alternate->d_lock);
 287                 iput(inode);
 288                 spin_unlock(&dcache_lock);
 289                 RETURN(alternate);
 290         }
 291
 292         dentry->d_flags |= DCACHE_DISCONNECTED;
 293
 294         /* d_add(), but don't drop dcache_lock before adding dentry to inode */
 295         list_add(&dentry->d_alias, &inode->i_dentry);   /* d_instantiate */
 296         dentry->d_inode = inode;
 297
 298         __d_rehash(dentry);                             /* d_rehash */
 299         spin_unlock(&dcache_lock);
 300
 301         return NULL;
 302 }
 303
 304 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 305 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry)
 306 #else
 307 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry,
 308                                   struct nameidata *nd)
 309 #endif
 310 {
 311         struct dentry * rdentry = NULL;
 312         struct inode * inode = NULL;
 313         int rc;
 314
 315         ENTRY;
 316
 317         rc = smfs_do_lookup(dir, dentry, nd, &inode);
 318         if (rc)
 319                 RETURN(ERR_PTR(rc));
 320
 321         //lmv stuff. Special dentry that has no inode.
 322         if (dentry->d_flags & DCACHE_CROSS_REF) {
 323                 d_add(dentry, NULL);
 324                 RETURN(NULL);
 325         }
 326         //TODO: should flags be checked and copied before?
 327         rdentry = iopen_connect_dentry(dentry, inode, 1);
 328
 329         RETURN(rdentry);
 330 }
 331
 332 #if HAVE_LOOKUP_RAW
 333 static int smfs_lookup_raw(struct inode *dir, const char *name,
 334                            int len, ino_t *data)
 335 {
 336         struct inode *cache_dir = I2CI(dir);
 337         int rc = 0;
 338
 339         if (!cache_dir)
 340                 RETURN(-ENOENT);
 341
 342         if (cache_dir->i_op->lookup_raw) {
 343                 rc = cache_dir->i_op->lookup_raw(cache_dir, name, len, data);
 344         } else {
 345                 CWARN("do not have raw lookup ops in bottom fs\n");
 346         }
 347
 348         RETURN(rc);
 349 }
 350 #endif
 351
 352 static int smfs_link(struct dentry *old_dentry,
 353                      struct inode *dir, struct dentry *dentry)
 354 {
 355         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 356         struct inode *cache_dir = I2CI(dir);
 357         struct inode *old_inode = old_dentry->d_inode;
 358         struct inode *cache_old_inode = I2CI(old_inode);
 359         struct dentry *cache_old_dentry = NULL;
 360         struct dentry *cache_dentry = NULL;
 361         struct dentry *cache_parent = NULL;
 362         void *handle = NULL;
 363         int rc = 0;
 364         struct hook_link_msg msg = {
 365                 .dentry = old_dentry,
 366                 .new_dentry = dentry
 367         };
 368
 369         ENTRY;
 370
 371         if (!cache_dir)
 372                 RETURN(-ENOENT);
 373
 374         if (!cache_old_inode)
 375                 RETURN(-ENOENT);
 376
 377         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 378         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 379         cache_old_dentry = pre_smfs_dentry(NULL, cache_old_inode, old_dentry);
 380         if (!cache_old_dentry || !cache_dentry || !cache_parent) {
 381                 rc = -ENOMEM;
 382                 goto exit;
 383         }
 384
 385         handle = smfs_trans_start(dir, FSFILT_OP_LINK, NULL);
 386         if (IS_ERR(handle)) {
 387                  rc = -ENOSPC;
 388                  goto exit;
 389         }
 390
 391         pre_smfs_inode(dir, cache_dir);
 392         pre_smfs_inode(old_inode, cache_old_inode);
 393
 394         //lock_kernel();
 395         SMFS_PRE_HOOK(dir, HOOK_LINK, &msg);
 396
 397         rc = cache_dir->i_op->link(cache_old_dentry, cache_dir, cache_dentry);
 398         if (!rc) {
 399                 atomic_inc(&old_inode->i_count);
 400                 old_inode->i_nlink++;
 401                 dput(iopen_connect_dentry(dentry, old_inode, 0));
 402         }
 403
 404         SMFS_POST_HOOK(dir, HOOK_LINK, &msg, rc);
 405
 406         post_smfs_inode(old_inode, cache_old_inode);
 407         post_smfs_inode(dir, cache_dir);
 408
 409         smfs_trans_commit(dir, handle, 0);
 410
 411 exit:
 412         //unlock_kernel();
 413         post_smfs_dentry(cache_dentry);
 414         post_smfs_dentry(cache_parent);
 415         post_smfs_dentry(cache_old_dentry);
 416
 417         RETURN(rc);
 418 }
 419
 420 static int smfs_unlink(struct inode * dir, struct dentry *dentry)
 421 {
 422         struct inode *cache_dir = I2CI(dir);
 423         struct inode *cache_inode = I2CI(dentry->d_inode);
 424         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 425         struct dentry *cache_dentry = NULL;
 426         struct dentry *cache_parent = NULL;
 427         void   *handle = NULL;
 428         int    rc = 0;
 429
 430         struct hook_unlink_msg msg = {
 431                 .dentry = dentry,
 432                 .mode = dentry->d_inode->i_mode
 433         };
 434
 435         ENTRY;
 436
 437         LASSERT(cache_dir);
 438         LASSERT(cache_inode);
 439         LASSERT(cache_dir->i_op->unlink);
 440         LASSERT(parent);
 441
 442         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 443                dentry->d_name.len, dentry->d_name.name, dentry,
 444                dir->i_ino, dir->i_generation);
 445
 446         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 447         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 448         if (!cache_dentry || !cache_parent) {
 449                 rc = -ENOMEM;
 450                 goto exit;
 451         }
 452
 453         handle = smfs_trans_start(dir, FSFILT_OP_UNLINK, NULL);
 454         if (IS_ERR(handle)) {
 455                 rc = -ENOSPC;
 456                 goto exit;
 457         }
 458
 459         pre_smfs_inode(dir, cache_dir);
 460         pre_smfs_inode(dentry->d_inode, cache_inode);
 461
 462         SMFS_PRE_HOOK(dir, HOOK_UNLINK, &msg);
 463
 464         rc = cache_dir->i_op->unlink(cache_dir, cache_dentry);
 465
 466         /* We don't d_delete() NFS sillyrenamed files--they still exist. */
 467         if (!rc && !(cache_dentry->d_flags & DCACHE_NFSFS_RENAMED)) {
 468                 d_delete(cache_dentry);
 469         }
 470
 471         SMFS_POST_HOOK(dir, HOOK_UNLINK, &msg, rc);
 472         if (!rc) {
 473                 post_smfs_inode(dentry->d_inode, cache_inode);
 474                 dentry->d_inode->i_nlink--;
 475                 post_smfs_inode(dir, cache_dir);
 476         }
 477
 478         smfs_trans_commit(dir, handle, 0);
 479 exit:
 480         post_smfs_dentry(cache_dentry);
 481         post_smfs_dentry(cache_parent);
 482         RETURN(rc);
 483 }
 484
 485 static int smfs_symlink(struct inode *dir, struct dentry *dentry,
 486                         const char *symname)
 487 {
 488         struct inode *cache_dir = I2CI(dir);
 489         struct inode *inode = NULL;
 490         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 491         struct dentry *cache_dentry = NULL;
 492         struct dentry *cache_parent = NULL;
 493         void   *handle = NULL;
 494         int    rc = 0;
 495         struct hook_symlink_msg msg = {
 496                 .dentry = dentry,
 497                 .tgt_len = strlen(symname) + 1,
 498                 .symname = (char*)symname
 499         };
 500
 501         ENTRY;
 502
 503         LASSERT(cache_dir);
 504         LASSERT(cache_dir->i_op->symlink);
 505         LASSERT(parent);
 506
 507         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 508         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 509         if (!cache_parent || !cache_dentry) {
 510                 rc = -ENOMEM;
 511                 goto exit;
 512         }
 513
 514         handle = smfs_trans_start(dir, FSFILT_OP_SYMLINK, NULL);
 515         if (IS_ERR(handle)) {
 516                 rc = -ENOSPC;
 517                 goto exit;
 518         }
 519
 520         pre_smfs_inode(dir, cache_dir);
 521
 522         SMFS_PRE_HOOK(dir, HOOK_SYMLINK, &msg);
 523
 524         rc = cache_dir->i_op->symlink(cache_dir, cache_dentry, symname);
 525         if (!rc) {
 526                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 527                                        I2SMI(dir), 0);
 528                 if (inode) {
 529                         d_instantiate(dentry, inode);
 530                 }
 531                 else
 532                         rc = -ENOENT;
 533         }
 534
 535         SMFS_POST_HOOK(dir, HOOK_SYMLINK, &msg, rc);
 536
 537         post_smfs_inode(dir, cache_dir);
 538         smfs_trans_commit(dir, handle, 0);
 539
 540 exit:
 541         post_smfs_dentry(cache_dentry);
 542         post_smfs_dentry(cache_parent);
 543         RETURN(rc);
 544 }
 545
 546 static int smfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 547 {
 548         struct inode *cache_dir = I2CI(dir);
 549         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 550         struct inode *inode = NULL;
 551         struct dentry *cache_dentry = NULL;
 552         struct dentry *cache_parent = NULL;
 553         void   *handle = NULL;
 554         int    rc = 0;
 555         struct hook_msg msg = {
 556                 .dentry = dentry,
 557         };
 558
 559         ENTRY;
 560
 561         LASSERT(cache_dir);
 562         LASSERT(parent);
 563
 564         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 565                dentry->d_name.len, dentry->d_name.name, dentry,
 566                dir->i_ino, dir->i_generation);
 567
 568         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 569         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 570         if (!cache_parent || !cache_dentry) {
 571                 rc = -ENOMEM;
 572                 goto exit;
 573         }
 574
 575         handle = smfs_trans_start(dir, FSFILT_OP_MKDIR, NULL);
 576         if (IS_ERR(handle)) {
 577                 rc = -ENOSPC;
 578                 goto exit;
 579         }
 580
 581         pre_smfs_inode(dir, cache_dir);
 582         SMFS_PRE_HOOK(dir, HOOK_MKDIR, &msg);
 583
 584         rc = cache_dir->i_op->mkdir(cache_dir, cache_dentry, mode);
 585         if (!rc) {
 586                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 587                                        I2SMI(dir), 0);
 588                 if (inode) {
 589                         lock_kernel();
 590                         dir->i_nlink++;
 591                         unlock_kernel();
 592                         d_instantiate(dentry, inode);
 593                 }
 594                 else
 595                         rc = -ENOENT;
 596         }
 597
 598         SMFS_POST_HOOK(dir, HOOK_MKDIR, &msg, rc);
 599         post_smfs_inode(dir, cache_dir);
 600         smfs_trans_commit(dir, handle, 0);
 601
 602 exit:
 603         post_smfs_dentry(cache_dentry);
 604         post_smfs_dentry(cache_parent);
 605         RETURN(rc);
 606 }
 607
 608 static int smfs_rmdir(struct inode *dir, struct dentry *dentry)
 609 {
 610         struct inode *cache_dir = I2CI(dir);
 611         struct inode *cache_inode = I2CI(dentry->d_inode);
 612         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 613         struct dentry *cache_dentry = NULL;
 614         struct dentry *cache_parent = NULL;
 615         struct inode * inode = dentry->d_inode;
 616         void *handle = NULL;
 617         int    rc = 0;
 618         struct hook_unlink_msg msg = {
 619                 .dentry = dentry,
 620                 .mode = S_IFDIR
 621         };
 622
 623         ENTRY;
 624
 625         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 626                dentry->d_name.len, dentry->d_name.name, dentry,
 627                dir->i_ino, dir->i_generation);
 628
 629         LASSERT(cache_dir);
 630         LASSERT(cache_dir->i_op->rmdir);
 631         LASSERT(parent);
 632
 633         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 634         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 635         if (!cache_parent || !cache_dentry) {
 636                 rc = -ENOMEM;
 637                 goto exit;
 638         }
 639
 640         handle = smfs_trans_start(dir, FSFILT_OP_RMDIR, NULL);
 641         if (IS_ERR(handle) ) {
 642                 rc = -ENOSPC;
 643                 goto exit;
 644         }
 645
 646         dentry_unhash(cache_dentry);
 647
 648         pre_smfs_inode(dir, cache_dir);
 649         pre_smfs_inode(inode, cache_inode);
 650
 651         SMFS_PRE_HOOK(dir, HOOK_RMDIR, &msg);
 652
 653         rc = cache_dir->i_op->rmdir(cache_dir, cache_dentry);
 654
 655         SMFS_POST_HOOK(dir, HOOK_RMDIR, &msg, rc);
 656         if (!rc) {
 657                 if (inode->i_nlink != 2)
 658                         CWARN("Directory #%lu under rmdir has %i nlinks\n",
 659                                 inode->i_ino, inode->i_nlink);
 660                 inode->i_nlink = 0;
 661                 lock_kernel();
 662                 dir->i_nlink--;
 663                 unlock_kernel();
 664                 post_smfs_inode(dir, cache_dir);
 665                 post_smfs_inode(inode, cache_inode);
 666                 //like vfs_rmdir is doing with inode
 667                 cache_inode->i_flags |= S_DEAD;
 668                 d_delete(cache_dentry);
 669         }
 670         smfs_trans_commit(dir, handle, 0);
 671
 672         dput(cache_dentry);
 673 exit:
 674         post_smfs_dentry(cache_dentry);
 675         post_smfs_dentry(cache_parent);
 676         RETURN(rc);
 677 }
 678
 679 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 680 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 681                       int mode, int rdev)
 682 #else
 683 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 684                       int mode, dev_t rdev)
 685 #endif
 686 {
 687         struct inode *cache_dir = I2CI(dir);
 688         struct inode *inode = NULL;
 689         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 690         struct dentry *cache_dentry = NULL;
 691         struct dentry *cache_parent = NULL;
 692         void *handle = NULL;
 693         int rc = 0;
 694         struct hook_msg msg = {
 695                 .dentry = dentry,
 696         };
 697
 698         ENTRY;
 699
 700         LASSERT(parent);
 701         LASSERT(cache_dir);
 702         LASSERT(cache_dir->i_op->mknod);
 703
 704         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 705         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 706         if (!cache_parent || !cache_dentry) {
 707                 rc = -ENOMEM;
 708                 goto exit;
 709         }
 710
 711         handle = smfs_trans_start(dir, FSFILT_OP_MKNOD, NULL);
 712         if (IS_ERR(handle)) {
 713                 rc = -ENOSPC;
 714                 goto exit;
 715         }
 716
 717         pre_smfs_inode(dir, cache_dir);
 718
 719         SMFS_PRE_HOOK(dir, HOOK_MKNOD, &msg);
 720
 721         rc = cache_dir->i_op->mknod(cache_dir, cache_dentry, mode, rdev);
 722         if (!rc) {
 723                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 724                                        I2SMI(dir), 0);
 725                 if (inode) {
 726                         //smsf_update_dentry(dentry, cache_dentry);
 727                         d_instantiate(dentry, inode);
 728                 }
 729                 else
 730                         rc = -ENOENT;
 731         }
 732
 733         SMFS_POST_HOOK(dir, HOOK_MKNOD, &msg, rc);
 734
 735         post_smfs_inode(dir, cache_dir);
 736
 737         smfs_trans_commit(dir, handle, 0);
 738
 739 exit:
 740         post_smfs_dentry(cache_dentry);
 741         post_smfs_dentry(cache_parent);
 742         RETURN(rc);
 743 }
 744
 745 static int smfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 746                        struct inode *new_dir,struct dentry *new_dentry)
 747 {
 748         struct inode *cache_old_dir = I2CI(old_dir);
 749         struct inode *cache_new_dir = I2CI(new_dir);
 750         struct inode *new_inode = new_dentry->d_inode;
 751         struct inode *cache_old_inode = I2CI(old_dentry->d_inode);
 752         struct inode *old_parent = I2CI(old_dentry->d_parent->d_inode);
 753         struct inode *new_parent = I2CI(new_dentry->d_parent->d_inode);
 754         struct inode *cache_new_inode = NULL;
 755         struct dentry *cache_old_dentry = NULL;
 756         struct dentry *cache_new_dentry = NULL;
 757         struct dentry *cache_new_parent = NULL;
 758         struct dentry *cache_old_parent = NULL;
 759         void *handle = NULL;
 760         int    rc = 0;
 761         struct hook_rename_msg msg = {
 762                 .dentry = old_dentry,
 763                 .new_dir = new_dir,
 764                 .old_dir = old_dir,
 765                 .new_dentry = new_dentry,
 766         };
 767
 768         ENTRY;
 769
 770         if (!cache_old_dir || !cache_new_dir || !cache_old_inode)
 771                 RETURN(-ENOENT);
 772
 773         if (new_inode) {
 774                 cache_new_inode = I2CI(new_inode);
 775                 if (!cache_new_inode)
 776                         RETURN(-ENOENT);
 777         }
 778
 779         cache_old_parent = pre_smfs_dentry(NULL, old_parent, old_dentry->d_parent);
 780         cache_old_dentry = pre_smfs_dentry(cache_old_parent, cache_old_inode,
 781                                            old_dentry);
 782         if (!cache_old_parent || !cache_old_dentry) {
 783                 rc = -ENOMEM;
 784                 goto exit;
 785         }
 786
 787         cache_new_parent = pre_smfs_dentry(NULL, new_parent, new_dentry->d_parent);
 788         cache_new_dentry = pre_smfs_dentry(cache_new_parent, cache_new_inode,
 789                                            new_dentry);
 790         if (!cache_new_parent || !cache_new_dentry) {
 791                 rc = -ENOMEM;
 792                 goto exit;
 793         }
 794
 795         handle = smfs_trans_start(old_dir, FSFILT_OP_RENAME, NULL);
 796         if (IS_ERR(handle)) {
 797                 rc = -ENOSPC;
 798                 goto exit;
 799         }
 800
 801         pre_smfs_inode(old_dir, cache_old_dir);
 802         pre_smfs_inode(new_dir, cache_new_dir);
 803         pre_smfs_inode(old_dentry->d_inode, cache_old_inode);
 804         if (new_inode)
 805                 pre_smfs_inode(new_inode, cache_new_inode);
 806
 807         SMFS_PRE_HOOK(old_dir, HOOK_RENAME, &msg);
 808
 809         rc = cache_old_dir->i_op->rename(cache_old_dir, cache_old_dentry,
 810                                          cache_new_dir, cache_new_dentry);
 811
 812         SMFS_POST_HOOK(old_dir, HOOK_RENAME, &msg, rc);
 813         if (!rc) {
 814                 post_smfs_inode(old_dir, cache_old_dir);
 815                 post_smfs_inode(new_dir, cache_new_dir);
 816                 post_smfs_inode(old_dentry->d_inode, cache_old_inode);
 817                 if (new_inode) {
 818                         post_smfs_inode(new_inode, cache_new_inode);
 819                         new_inode->i_nlink--;
 820                 }
 821                 //directory is renamed
 822                 if (S_ISDIR(old_dentry->d_inode->i_mode)) {
 823                         old_dir->i_nlink--;
 824                         if (new_inode) {
 825                                 new_inode->i_nlink--;
 826                         } else {
 827                                 new_dir->i_nlink++;
 828                         }
 829                 }
 830         }
 831         smfs_trans_commit(old_dir, handle, 0);
 832
 833 exit:
 834         post_smfs_dentry(cache_old_dentry);
 835         post_smfs_dentry(cache_old_parent);
 836         post_smfs_dentry(cache_new_dentry);
 837         post_smfs_dentry(cache_new_parent);
 838         RETURN(rc);
 839 }
 840
 841 struct inode_operations smfs_dir_iops = {
 842         .create         = smfs_create,
 843         .lookup         = smfs_lookup,
 844 #if HAVE_LOOKUP_RAW
 845         .lookup_raw     = smfs_lookup_raw,
 846 #endif
 847         .link           = smfs_link,
 848         .unlink         = smfs_unlink,
 849         .symlink        = smfs_symlink,
 850         .mkdir          = smfs_mkdir,
 851         .rmdir          = smfs_rmdir,
 852         .mknod          = smfs_mknod,
 853         .rename         = smfs_rename,
 854         .setxattr       = smfs_setxattr,
 855         .getxattr       = smfs_getxattr,
 856         .listxattr      = smfs_listxattr,
 857         .removexattr    = smfs_removexattr,
 858         .permission     = smfs_permission,
 859 };
 860
 861 struct inode_operations smfs_iopen_iops = {
 862         .lookup         = smfs_iopen_lookup,
 863 };
 864
 865 static ssize_t smfs_read_dir(struct file *filp, char *buf,
 866                              size_t size, loff_t *ppos)
 867 {
 868         struct dentry *dentry = filp->f_dentry;
 869         struct inode *cache_inode = NULL;
 870         struct smfs_file_info *sfi = NULL;
 871         loff_t tmp_ppos;
 872         loff_t *cache_ppos = NULL;
 873         int    rc = 0;
 874
 875         ENTRY;
 876
 877         cache_inode = I2CI(dentry->d_inode);
 878
 879         if (!cache_inode || !cache_inode->i_fop->read)
 880                 RETURN(-EINVAL);
 881
 882         sfi = F2SMFI(filp);
 883         if (sfi->magic != SMFS_FILE_MAGIC)
 884                 BUG();
 885
 886         if (ppos != &(filp->f_pos))
 887                 cache_ppos = &tmp_ppos;
 888         else
 889                 cache_ppos = &sfi->c_file->f_pos;
 890
 891         *cache_ppos = *ppos;
 892
 893         rc = cache_inode->i_fop->read(sfi->c_file, buf, size, cache_ppos);
 894         if (rc)
 895                 RETURN(rc);
 896
 897         *ppos = *cache_ppos;
 898
 899         duplicate_file(filp, sfi->c_file);
 900
 901         RETURN(rc);
 902 }
 903
 904 static int smfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 905 {
 906         struct dentry *dentry = filp->f_dentry;
 907         struct inode *cache_inode = NULL;
 908         struct smfs_file_info *sfi = NULL;
 909         int    rc = 0;
 910
 911         ENTRY;
 912
 913         cache_inode = I2CI(dentry->d_inode);
 914         if (!cache_inode || !cache_inode->i_fop->readdir)
 915                 RETURN(-EINVAL);
 916
 917         sfi = F2SMFI(filp);
 918         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 919
 920         rc = cache_inode->i_fop->readdir(sfi->c_file, dirent, filldir);
 921
 922         duplicate_file(filp, sfi->c_file);
 923
 924         RETURN(rc);
 925 }
 926
 927 struct file_operations smfs_dir_fops = {
 928         .read           = smfs_read_dir,
 929         .readdir        = smfs_readdir,       /* BKL held */
 930         .ioctl          = smfs_ioctl,         /* BKL held */
 931         .fsync          = smfs_fsync,         /* BKL held */
 932         .open           = smfs_open,
 933         .release        = smfs_release,
 934 };
 935
 936 struct file_operations smfs_iopen_fops = {
 937         .read           = smfs_read_dir,
 938 };
 939