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_INODE, "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_INODE, "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 {
 231                                 if (!tmp->d_inode->i_nlink) {
 232                                         struct inode * ind = tmp->d_inode;
 233
 234                                         CWARN("inode #%lu (%*s) nlink is %i/%i\n",
 235                                               ind->i_ino, tmp->d_name.len,
 236                                               tmp->d_name.name, ind->i_nlink,
 237                                               (*inode)->i_nlink);
 238                                         CWARN("parent #%lu (%*s) nlink is %i\n",
 239                                               dir->i_ino, tmp->d_parent->d_name.len,
 240                                               tmp->d_parent->d_name.name,
 241                                               cache_dir->i_nlink);
 242                                         LBUG();
 243                                 }
 244                         }
 245                 }
 246         }
 247
 248         if (rdentry) {
 249                 dput(rdentry);
 250         }
 251
 252 exit:
 253         post_smfs_dentry(cache_dentry);
 254         post_smfs_dentry(cache_parent);
 255
 256         RETURN(rc);
 257 }
 258
 259 static struct dentry * smfs_iopen_lookup(struct inode * dir,
 260                                          struct dentry *dentry,
 261                                          struct nameidata *nd)
 262 {
 263         struct dentry * alternate = NULL;
 264         struct inode *inode = NULL;
 265         int rc = 0;
 266         ENTRY;
 267
 268         rc = smfs_do_lookup(dir, dentry, nd, &inode);
 269         if (rc)
 270                 RETURN(ERR_PTR(rc));
 271
 272         LASSERT(inode);
 273         /* preferrably return a connected dentry */
 274         spin_lock(&dcache_lock);
 275         list_for_each_entry(alternate, &inode->i_dentry, d_alias) {
 276                 LASSERT(!(alternate->d_flags & DCACHE_DISCONNECTED));
 277         }
 278
 279         list_for_each_entry(alternate, &inode->i_dentry, d_alias) {
 280                 dget_locked(alternate);
 281                 spin_lock(&alternate->d_lock);
 282                 alternate->d_flags |= DCACHE_REFERENCED;
 283                 spin_unlock(&alternate->d_lock);
 284                 iput(inode);
 285                 spin_unlock(&dcache_lock);
 286                 RETURN(alternate);
 287         }
 288
 289         dentry->d_flags |= DCACHE_DISCONNECTED;
 290
 291         /* d_add(), but don't drop dcache_lock before adding dentry to inode */
 292         list_add(&dentry->d_alias, &inode->i_dentry);   /* d_instantiate */
 293         dentry->d_inode = inode;
 294
 295         __d_rehash(dentry);                             /* d_rehash */
 296         spin_unlock(&dcache_lock);
 297
 298         return NULL;
 299 }
 300
 301 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 302 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry)
 303 #else
 304 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry,
 305                                   struct nameidata *nd)
 306 #endif
 307 {
 308         struct dentry * rdentry = NULL;
 309         struct inode * inode = NULL;
 310         int rc;
 311
 312         ENTRY;
 313
 314         rc = smfs_do_lookup(dir, dentry, nd, &inode);
 315         if (rc)
 316                 RETURN(ERR_PTR(rc));
 317
 318         //lmv stuff. Special dentry that has no inode.
 319         if (dentry->d_flags & DCACHE_CROSS_REF) {
 320                 d_add(dentry, NULL);
 321                 RETURN(NULL);
 322         }
 323         //TODO: should flags be checked and copied before?
 324         rdentry = iopen_connect_dentry(dentry, inode, 1);
 325
 326         RETURN(rdentry);
 327 }
 328
 329 #if HAVE_LOOKUP_RAW
 330 static int smfs_lookup_raw(struct inode *dir, const char *name,
 331                            int len, ino_t *data)
 332 {
 333         struct inode *cache_dir = I2CI(dir);
 334         int rc = 0;
 335
 336         if (!cache_dir)
 337                 RETURN(-ENOENT);
 338
 339         if (cache_dir->i_op->lookup_raw) {
 340                 rc = cache_dir->i_op->lookup_raw(cache_dir, name, len, data);
 341         } else {
 342                 CWARN("do not have raw lookup ops in bottom fs\n");
 343         }
 344
 345         RETURN(rc);
 346 }
 347 #endif
 348
 349 static int smfs_link(struct dentry *old_dentry,
 350                      struct inode *dir, struct dentry *dentry)
 351 {
 352         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 353         struct inode *cache_dir = I2CI(dir);
 354         struct inode *old_inode = old_dentry->d_inode;
 355         struct inode *cache_old_inode = I2CI(old_inode);
 356         struct dentry *cache_old_dentry = NULL;
 357         struct dentry *cache_dentry = NULL;
 358         struct dentry *cache_parent = NULL;
 359         void *handle = NULL;
 360         int rc = 0;
 361         struct hook_link_msg msg = {
 362                 .dentry = old_dentry,
 363                 .new_dentry = dentry
 364         };
 365
 366         ENTRY;
 367
 368         if (!cache_dir)
 369                 RETURN(-ENOENT);
 370
 371         if (!cache_old_inode)
 372                 RETURN(-ENOENT);
 373
 374         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 375         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 376         cache_old_dentry = pre_smfs_dentry(NULL, cache_old_inode, old_dentry);
 377         if (!cache_old_dentry || !cache_dentry || !cache_parent) {
 378                 rc = -ENOMEM;
 379                 goto exit;
 380         }
 381
 382         handle = smfs_trans_start(dir, FSFILT_OP_LINK, NULL);
 383         if (IS_ERR(handle)) {
 384                  rc = -ENOSPC;
 385                  goto exit;
 386         }
 387
 388         pre_smfs_inode(dir, cache_dir);
 389         pre_smfs_inode(old_inode, cache_old_inode);
 390
 391         //lock_kernel();
 392         SMFS_PRE_HOOK(dir, HOOK_LINK, &msg);
 393
 394         rc = cache_dir->i_op->link(cache_old_dentry, cache_dir, cache_dentry);
 395         if (!rc) {
 396                 atomic_inc(&old_inode->i_count);
 397                 old_inode->i_nlink++;
 398                 dput(iopen_connect_dentry(dentry, old_inode, 0));
 399         }
 400
 401         SMFS_POST_HOOK(dir, HOOK_LINK, &msg, rc);
 402
 403         post_smfs_inode(old_inode, cache_old_inode);
 404         post_smfs_inode(dir, cache_dir);
 405
 406         smfs_trans_commit(dir, handle, 0);
 407
 408 exit:
 409         //unlock_kernel();
 410         post_smfs_dentry(cache_dentry);
 411         post_smfs_dentry(cache_parent);
 412         post_smfs_dentry(cache_old_dentry);
 413
 414         RETURN(rc);
 415 }
 416
 417 static int smfs_unlink(struct inode * dir, struct dentry *dentry)
 418 {
 419         struct inode *cache_dir = I2CI(dir);
 420         struct inode *cache_inode = I2CI(dentry->d_inode);
 421         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 422         struct dentry *cache_dentry = NULL;
 423         struct dentry *cache_parent = NULL;
 424         void   *handle = NULL;
 425         int    rc = 0;
 426         //int    mode = 0;
 427         struct hook_unlink_msg msg = {
 428                 .dentry = dentry,
 429                 .mode = dentry->d_inode->i_mode
 430         };
 431
 432         ENTRY;
 433
 434         LASSERT(cache_dir);
 435         LASSERT(cache_inode);
 436         LASSERT(cache_dir->i_op->unlink);
 437         LASSERT(parent);
 438
 439         CDEBUG(D_INODE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 440                dentry->d_name.len, dentry->d_name.name, dentry,
 441                dir->i_ino, dir->i_generation);
 442
 443         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 444         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 445         if (!cache_dentry || !cache_parent) {
 446                 rc = -ENOMEM;
 447                 goto exit;
 448         }
 449
 450         handle = smfs_trans_start(dir, FSFILT_OP_UNLINK, NULL);
 451         if (IS_ERR(handle)) {
 452                 rc = -ENOSPC;
 453                 goto exit;
 454         }
 455
 456         pre_smfs_inode(dir, cache_dir);
 457         pre_smfs_inode(dentry->d_inode, cache_inode);
 458
 459         SMFS_PRE_HOOK(dir, HOOK_UNLINK, &msg);
 460
 461         rc = cache_dir->i_op->unlink(cache_dir, cache_dentry);
 462
 463         SMFS_POST_HOOK(dir, HOOK_UNLINK, &msg, rc);
 464         if (!rc) {
 465                 post_smfs_inode(dentry->d_inode, cache_inode);
 466                 dentry->d_inode->i_nlink--;
 467                 post_smfs_inode(dir, cache_dir);
 468         }
 469
 470         smfs_trans_commit(dir, handle, 0);
 471 exit:
 472         post_smfs_dentry(cache_dentry);
 473         post_smfs_dentry(cache_parent);
 474         RETURN(rc);
 475 }
 476
 477 static int smfs_symlink(struct inode *dir, struct dentry *dentry,
 478                         const char *symname)
 479 {
 480         struct inode *cache_dir = I2CI(dir);
 481         struct inode *inode = NULL;
 482         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 483         struct dentry *cache_dentry = NULL;
 484         struct dentry *cache_parent = NULL;
 485         void   *handle = NULL;
 486         int    rc = 0;
 487         struct hook_symlink_msg msg = {
 488                 .dentry = dentry,
 489                 .tgt_len = strlen(symname) + 1,
 490                 .symname = (char*)symname
 491         };
 492
 493         ENTRY;
 494
 495         LASSERT(cache_dir);
 496         LASSERT(cache_dir->i_op->symlink);
 497         LASSERT(parent);
 498
 499         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 500         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 501         if (!cache_parent || !cache_dentry) {
 502                 rc = -ENOMEM;
 503                 goto exit;
 504         }
 505
 506         handle = smfs_trans_start(dir, FSFILT_OP_SYMLINK, NULL);
 507         if (IS_ERR(handle)) {
 508                 rc = -ENOSPC;
 509                 goto exit;
 510         }
 511
 512         pre_smfs_inode(dir, cache_dir);
 513
 514         SMFS_PRE_HOOK(dir, HOOK_SYMLINK, &msg);
 515
 516         rc = cache_dir->i_op->symlink(cache_dir, cache_dentry, symname);
 517         if (!rc) {
 518                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 519                                        I2SMI(dir), 0);
 520                 if (inode) {
 521                         d_instantiate(dentry, inode);
 522                 }
 523                 else
 524                         rc = -ENOENT;
 525         }
 526
 527         SMFS_POST_HOOK(dir, HOOK_SYMLINK, &msg, rc);
 528
 529         post_smfs_inode(dir, cache_dir);
 530         smfs_trans_commit(dir, handle, 0);
 531
 532 exit:
 533         post_smfs_dentry(cache_dentry);
 534         post_smfs_dentry(cache_parent);
 535         RETURN(rc);
 536 }
 537
 538 static int smfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 539 {
 540         struct inode *cache_dir = I2CI(dir);
 541         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 542         struct inode *inode = NULL;
 543         struct dentry *cache_dentry = NULL;
 544         struct dentry *cache_parent = NULL;
 545         void   *handle = NULL;
 546         int    rc = 0;
 547         struct hook_msg msg = {
 548                 .dentry = dentry,
 549         };
 550
 551         ENTRY;
 552
 553         LASSERT(cache_dir);
 554         LASSERT(parent);
 555
 556         CDEBUG(D_INODE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 557                dentry->d_name.len, dentry->d_name.name, dentry,
 558                dir->i_ino, dir->i_generation);
 559
 560
 561         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 562         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 563         if (!cache_parent || !cache_dentry) {
 564                 rc = -ENOMEM;
 565                 goto exit;
 566         }
 567
 568         handle = smfs_trans_start(dir, FSFILT_OP_MKDIR, NULL);
 569         if (IS_ERR(handle)) {
 570                 rc = -ENOSPC;
 571                 goto exit;
 572         }
 573
 574         pre_smfs_inode(dir, cache_dir);
 575         SMFS_PRE_HOOK(dir, HOOK_MKDIR, &msg);
 576
 577         rc = cache_dir->i_op->mkdir(cache_dir, cache_dentry, mode);
 578         if (!rc) {
 579                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 580                                        I2SMI(dir), 0);
 581                 if (inode) {
 582                         dir->i_nlink++;
 583                         d_instantiate(dentry, inode);
 584                 }
 585                 else
 586                         rc = -ENOENT;
 587         }
 588
 589         SMFS_POST_HOOK(dir, HOOK_MKDIR, &msg, rc);
 590         post_smfs_inode(dir, cache_dir);
 591         smfs_trans_commit(dir, handle, 0);
 592
 593 exit:
 594         post_smfs_dentry(cache_dentry);
 595         post_smfs_dentry(cache_parent);
 596         RETURN(rc);
 597 }
 598
 599 static int smfs_rmdir(struct inode *dir, struct dentry *dentry)
 600 {
 601         struct inode *cache_dir = I2CI(dir);
 602         struct inode *cache_inode = I2CI(dentry->d_inode);
 603         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 604         struct dentry *cache_dentry = NULL;
 605         struct dentry *cache_parent = NULL;
 606         struct inode * inode = dentry->d_inode;
 607         void *handle = NULL;
 608         int    rc = 0;
 609         struct hook_unlink_msg msg = {
 610                 .dentry = dentry,
 611                 .mode = S_IFDIR
 612         };
 613
 614         ENTRY;
 615
 616         CDEBUG(D_INODE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 617                dentry->d_name.len, dentry->d_name.name, dentry,
 618                dir->i_ino, dir->i_generation);
 619
 620         LASSERT(cache_dir);
 621         LASSERT(cache_dir->i_op->rmdir);
 622         LASSERT(parent);
 623
 624         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 625         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 626         if (!cache_parent || !cache_dentry) {
 627                 rc = -ENOMEM;
 628                 goto exit;
 629         }
 630
 631         handle = smfs_trans_start(dir, FSFILT_OP_RMDIR, NULL);
 632         if (IS_ERR(handle) ) {
 633                 rc = -ENOSPC;
 634                 goto exit;
 635         }
 636
 637         dentry_unhash(cache_dentry);
 638
 639         pre_smfs_inode(dir, cache_dir);
 640         pre_smfs_inode(inode, cache_inode);
 641
 642         SMFS_PRE_HOOK(dir, HOOK_RMDIR, &msg);
 643
 644         rc = cache_dir->i_op->rmdir(cache_dir, cache_dentry);
 645
 646         SMFS_POST_HOOK(dir, HOOK_RMDIR, &msg, rc);
 647         if (!rc) {
 648                 if (inode->i_nlink != 2)
 649                         CWARN("Directory #%lu under rmdir has %i nlinks\n",
 650                                 inode->i_ino, inode->i_nlink);
 651                 inode->i_nlink = 0;
 652                 dir->i_nlink--;
 653                 post_smfs_inode(dir, cache_dir);
 654                 post_smfs_inode(inode, cache_inode);
 655                 //like vfs_rmdir is doing with inode
 656                 cache_inode->i_flags |= S_DEAD;
 657         }
 658         smfs_trans_commit(dir, handle, 0);
 659         dput(cache_dentry);
 660 exit:
 661         post_smfs_dentry(cache_dentry);
 662         post_smfs_dentry(cache_parent);
 663         RETURN(rc);
 664 }
 665
 666 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 667 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 668                       int mode, int rdev)
 669 #else
 670 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 671                       int mode, dev_t rdev)
 672 #endif
 673 {
 674         struct inode *cache_dir = I2CI(dir);
 675         struct inode *inode = NULL;
 676         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 677         struct dentry *cache_dentry = NULL;
 678         struct dentry *cache_parent = NULL;
 679         void *handle = NULL;
 680         int rc = 0;
 681         struct hook_msg msg = {
 682                 .dentry = dentry,
 683         };
 684
 685         ENTRY;
 686
 687         LASSERT(parent);
 688         LASSERT(cache_dir);
 689         LASSERT(cache_dir->i_op->mknod);
 690
 691         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 692         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 693         if (!cache_parent || !cache_dentry) {
 694                 rc = -ENOMEM;
 695                 goto exit;
 696         }
 697
 698         handle = smfs_trans_start(dir, FSFILT_OP_MKNOD, NULL);
 699         if (IS_ERR(handle)) {
 700                 rc = -ENOSPC;
 701                 goto exit;
 702         }
 703
 704         pre_smfs_inode(dir, cache_dir);
 705
 706         SMFS_PRE_HOOK(dir, HOOK_MKNOD, &msg);
 707
 708         rc = cache_dir->i_op->mknod(cache_dir, cache_dentry, mode, rdev);
 709         if (!rc) {
 710                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 711                                        I2SMI(dir), 0);
 712                 if (inode) {
 713                         //smsf_update_dentry(dentry, cache_dentry);
 714                         d_instantiate(dentry, inode);
 715                 }
 716                 else
 717                         rc = -ENOENT;
 718         }
 719
 720         SMFS_POST_HOOK(dir, HOOK_MKNOD, &msg, rc);
 721
 722         post_smfs_inode(dir, cache_dir);
 723
 724         smfs_trans_commit(dir, handle, 0);
 725
 726 exit:
 727         post_smfs_dentry(cache_dentry);
 728         post_smfs_dentry(cache_parent);
 729         RETURN(rc);
 730 }
 731
 732 static int smfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 733                        struct inode *new_dir,struct dentry *new_dentry)
 734 {
 735         struct inode *cache_old_dir = I2CI(old_dir);
 736         struct inode *cache_new_dir = I2CI(new_dir);
 737         struct inode *new_inode = new_dentry->d_inode;
 738         struct inode *cache_old_inode = I2CI(old_dentry->d_inode);
 739         struct inode *old_parent = I2CI(old_dentry->d_parent->d_inode);
 740         struct inode *new_parent = I2CI(new_dentry->d_parent->d_inode);
 741         struct inode *cache_new_inode = NULL;
 742         struct dentry *cache_old_dentry = NULL;
 743         struct dentry *cache_new_dentry = NULL;
 744         struct dentry *cache_new_parent = NULL;
 745         struct dentry *cache_old_parent = NULL;
 746         void *handle = NULL;
 747         int    rc = 0;
 748         struct hook_rename_msg msg = {
 749                 .dentry = old_dentry,
 750                 .new_dir = new_dir,
 751                 .new_dentry = new_dentry
 752         };
 753
 754         ENTRY;
 755
 756         if (!cache_old_dir || !cache_new_dir || !cache_old_inode)
 757                 RETURN(-ENOENT);
 758
 759         if (new_inode) {
 760                 cache_new_inode = I2CI(new_inode);
 761                 if (!cache_new_inode)
 762                         RETURN(-ENOENT);
 763         }
 764
 765         cache_old_parent = pre_smfs_dentry(NULL, old_parent, old_dentry->d_parent);
 766         cache_old_dentry = pre_smfs_dentry(cache_old_parent, cache_old_inode,
 767                                            old_dentry);
 768         if (!cache_old_parent || !cache_old_dentry) {
 769                 rc = -ENOMEM;
 770                 goto exit;
 771         }
 772
 773         cache_new_parent = pre_smfs_dentry(NULL, new_parent, new_dentry->d_parent);
 774         cache_new_dentry = pre_smfs_dentry(cache_new_parent, cache_new_inode,
 775                                            new_dentry);
 776         if (!cache_new_parent || !cache_new_dentry) {
 777                 rc = -ENOMEM;
 778                 goto exit;
 779         }
 780
 781         handle = smfs_trans_start(old_dir, FSFILT_OP_RENAME, NULL);
 782         if (IS_ERR(handle)) {
 783                 rc = -ENOSPC;
 784                 goto exit;
 785         }
 786
 787         pre_smfs_inode(old_dir, cache_old_dir);
 788         pre_smfs_inode(new_dir, cache_new_dir);
 789         pre_smfs_inode(old_dentry->d_inode, cache_old_inode);
 790         if (new_inode)
 791                 pre_smfs_inode(new_inode, cache_new_inode);
 792
 793         SMFS_PRE_HOOK(old_dir, HOOK_RENAME, &msg);
 794
 795         rc = cache_old_dir->i_op->rename(cache_old_dir, cache_old_dentry,
 796                                          cache_new_dir, cache_new_dentry);
 797
 798         SMFS_POST_HOOK(old_dir, HOOK_RENAME, &msg, rc);
 799         if (!rc) {
 800                 post_smfs_inode(old_dir, cache_old_dir);
 801                 post_smfs_inode(new_dir, cache_new_dir);
 802                 post_smfs_inode(old_dentry->d_inode, cache_old_inode);
 803                 if (new_inode) {
 804                         post_smfs_inode(new_inode, cache_new_inode);
 805                         new_inode->i_nlink--;
 806                 }
 807                 //directory is renamed
 808                 if (S_ISDIR(old_dentry->d_inode->i_mode)) {
 809                         old_dir->i_nlink--;
 810                         if (new_inode) {
 811                                 new_inode->i_nlink--;
 812                         } else {
 813                                 new_dir->i_nlink++;
 814                         }
 815                 }
 816         }
 817         smfs_trans_commit(old_dir, handle, 0);
 818
 819 exit:
 820         post_smfs_dentry(cache_old_dentry);
 821         post_smfs_dentry(cache_old_parent);
 822         post_smfs_dentry(cache_new_dentry);
 823         post_smfs_dentry(cache_new_parent);
 824         RETURN(rc);
 825 }
 826
 827 struct inode_operations smfs_dir_iops = {
 828         .create         = smfs_create,
 829         .lookup         = smfs_lookup,
 830 #if HAVE_LOOKUP_RAW
 831         .lookup_raw     = smfs_lookup_raw,
 832 #endif
 833         .link           = smfs_link,
 834         .unlink         = smfs_unlink,
 835         .symlink        = smfs_symlink,
 836         .mkdir          = smfs_mkdir,
 837         .rmdir          = smfs_rmdir,
 838         .mknod          = smfs_mknod,
 839         .rename         = smfs_rename,
 840         .setxattr       = smfs_setxattr,
 841         .getxattr       = smfs_getxattr,
 842         .listxattr      = smfs_listxattr,
 843         .removexattr    = smfs_removexattr,
 844         .permission     = smfs_permission,
 845 };
 846
 847 struct inode_operations smfs_iopen_iops = {
 848         .lookup         = smfs_iopen_lookup,
 849 };
 850
 851 static ssize_t smfs_read_dir(struct file *filp, char *buf,
 852                              size_t size, loff_t *ppos)
 853 {
 854         struct dentry *dentry = filp->f_dentry;
 855         struct inode *cache_inode = NULL;
 856         struct smfs_file_info *sfi = NULL;
 857         loff_t tmp_ppos;
 858         loff_t *cache_ppos = NULL;
 859         int    rc = 0;
 860
 861         ENTRY;
 862
 863         cache_inode = I2CI(dentry->d_inode);
 864
 865         if (!cache_inode || !cache_inode->i_fop->read)
 866                 RETURN(-EINVAL);
 867
 868         sfi = F2SMFI(filp);
 869         if (sfi->magic != SMFS_FILE_MAGIC)
 870                 BUG();
 871
 872         if (ppos != &(filp->f_pos))
 873                 cache_ppos = &tmp_ppos;
 874         else
 875                 cache_ppos = &sfi->c_file->f_pos;
 876
 877         *cache_ppos = *ppos;
 878
 879         rc = cache_inode->i_fop->read(sfi->c_file, buf, size, cache_ppos);
 880         if (rc)
 881                 RETURN(rc);
 882
 883         *ppos = *cache_ppos;
 884
 885         duplicate_file(filp, sfi->c_file);
 886
 887         RETURN(rc);
 888 }
 889
 890 static int smfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 891 {
 892         struct dentry *dentry = filp->f_dentry;
 893         struct inode *cache_inode = NULL;
 894         struct smfs_file_info *sfi = NULL;
 895         int    rc = 0;
 896         struct hook_readdir_msg msg = {
 897                 .dentry = dentry,
 898                 .filp = filp,
 899                 .dirent = dirent,
 900                 .filldir = filldir
 901         };
 902
 903         ENTRY;
 904
 905         cache_inode = I2CI(dentry->d_inode);
 906         if (!cache_inode || !cache_inode->i_fop->readdir)
 907                 RETURN(-EINVAL);
 908
 909         sfi = F2SMFI(filp);
 910         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 911
 912         SMFS_PRE_HOOK(dentry->d_inode, HOOK_READDIR, &msg);
 913
 914         rc = cache_inode->i_fop->readdir(sfi->c_file, dirent, filldir);
 915
 916         SMFS_POST_HOOK(dentry->d_inode, HOOK_READDIR, &msg, rc);
 917         duplicate_file(filp, sfi->c_file);
 918
 919         RETURN(rc);
 920 }
 921
 922 struct file_operations smfs_dir_fops = {
 923         .read           = smfs_read_dir,
 924         .readdir        = smfs_readdir,       /* BKL held */
 925         .ioctl          = smfs_ioctl,         /* BKL held */
 926         .fsync          = smfs_fsync,         /* BKL held */
 927         .open           = smfs_open,
 928         .release        = smfs_release,
 929 };
 930
 931 struct file_operations smfs_iopen_fops = {
 932         .read           = smfs_read_dir,
 933 };
 934