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         //int    mode = 0;
 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         SMFS_POST_HOOK(dir, HOOK_UNLINK, &msg, rc);
 467         if (!rc) {
 468                 post_smfs_inode(dentry->d_inode, cache_inode);
 469                 dentry->d_inode->i_nlink--;
 470                 post_smfs_inode(dir, cache_dir);
 471         }
 472
 473         smfs_trans_commit(dir, handle, 0);
 474 exit:
 475         post_smfs_dentry(cache_dentry);
 476         post_smfs_dentry(cache_parent);
 477         RETURN(rc);
 478 }
 479
 480 static int smfs_symlink(struct inode *dir, struct dentry *dentry,
 481                         const char *symname)
 482 {
 483         struct inode *cache_dir = I2CI(dir);
 484         struct inode *inode = NULL;
 485         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 486         struct dentry *cache_dentry = NULL;
 487         struct dentry *cache_parent = NULL;
 488         void   *handle = NULL;
 489         int    rc = 0;
 490         struct hook_symlink_msg msg = {
 491                 .dentry = dentry,
 492                 .tgt_len = strlen(symname) + 1,
 493                 .symname = (char*)symname
 494         };
 495
 496         ENTRY;
 497
 498         LASSERT(cache_dir);
 499         LASSERT(cache_dir->i_op->symlink);
 500         LASSERT(parent);
 501
 502         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 503         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 504         if (!cache_parent || !cache_dentry) {
 505                 rc = -ENOMEM;
 506                 goto exit;
 507         }
 508
 509         handle = smfs_trans_start(dir, FSFILT_OP_SYMLINK, NULL);
 510         if (IS_ERR(handle)) {
 511                 rc = -ENOSPC;
 512                 goto exit;
 513         }
 514
 515         pre_smfs_inode(dir, cache_dir);
 516
 517         SMFS_PRE_HOOK(dir, HOOK_SYMLINK, &msg);
 518
 519         rc = cache_dir->i_op->symlink(cache_dir, cache_dentry, symname);
 520         if (!rc) {
 521                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 522                                        I2SMI(dir), 0);
 523                 if (inode) {
 524                         d_instantiate(dentry, inode);
 525                 }
 526                 else
 527                         rc = -ENOENT;
 528         }
 529
 530         SMFS_POST_HOOK(dir, HOOK_SYMLINK, &msg, rc);
 531
 532         post_smfs_inode(dir, cache_dir);
 533         smfs_trans_commit(dir, handle, 0);
 534
 535 exit:
 536         post_smfs_dentry(cache_dentry);
 537         post_smfs_dentry(cache_parent);
 538         RETURN(rc);
 539 }
 540
 541 static int smfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 542 {
 543         struct inode *cache_dir = I2CI(dir);
 544         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 545         struct inode *inode = NULL;
 546         struct dentry *cache_dentry = NULL;
 547         struct dentry *cache_parent = NULL;
 548         void   *handle = NULL;
 549         int    rc = 0;
 550         struct hook_msg msg = {
 551                 .dentry = dentry,
 552         };
 553
 554         ENTRY;
 555
 556         LASSERT(cache_dir);
 557         LASSERT(parent);
 558
 559         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 560                dentry->d_name.len, dentry->d_name.name, dentry,
 561                dir->i_ino, dir->i_generation);
 562
 563         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 564         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 565         if (!cache_parent || !cache_dentry) {
 566                 rc = -ENOMEM;
 567                 goto exit;
 568         }
 569
 570         handle = smfs_trans_start(dir, FSFILT_OP_MKDIR, NULL);
 571         if (IS_ERR(handle)) {
 572                 rc = -ENOSPC;
 573                 goto exit;
 574         }
 575
 576         pre_smfs_inode(dir, cache_dir);
 577         SMFS_PRE_HOOK(dir, HOOK_MKDIR, &msg);
 578
 579         rc = cache_dir->i_op->mkdir(cache_dir, cache_dentry, mode);
 580         if (!rc) {
 581                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 582                                        I2SMI(dir), 0);
 583                 if (inode) {
 584                         dir->i_nlink++;
 585                         d_instantiate(dentry, inode);
 586                 }
 587                 else
 588                         rc = -ENOENT;
 589         }
 590
 591         SMFS_POST_HOOK(dir, HOOK_MKDIR, &msg, rc);
 592         post_smfs_inode(dir, cache_dir);
 593         smfs_trans_commit(dir, handle, 0);
 594
 595 exit:
 596         post_smfs_dentry(cache_dentry);
 597         post_smfs_dentry(cache_parent);
 598         RETURN(rc);
 599 }
 600
 601 static int smfs_rmdir(struct inode *dir, struct dentry *dentry)
 602 {
 603         struct inode *cache_dir = I2CI(dir);
 604         struct inode *cache_inode = I2CI(dentry->d_inode);
 605         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 606         struct dentry *cache_dentry = NULL;
 607         struct dentry *cache_parent = NULL;
 608         struct inode * inode = dentry->d_inode;
 609         void *handle = NULL;
 610         int    rc = 0;
 611         struct hook_unlink_msg msg = {
 612                 .dentry = dentry,
 613                 .mode = S_IFDIR
 614         };
 615
 616         ENTRY;
 617
 618         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s (%p),dir=%lu/%u\n",
 619                dentry->d_name.len, dentry->d_name.name, dentry,
 620                dir->i_ino, dir->i_generation);
 621
 622         LASSERT(cache_dir);
 623         LASSERT(cache_dir->i_op->rmdir);
 624         LASSERT(parent);
 625
 626         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 627         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 628         if (!cache_parent || !cache_dentry) {
 629                 rc = -ENOMEM;
 630                 goto exit;
 631         }
 632
 633         handle = smfs_trans_start(dir, FSFILT_OP_RMDIR, NULL);
 634         if (IS_ERR(handle) ) {
 635                 rc = -ENOSPC;
 636                 goto exit;
 637         }
 638
 639         dentry_unhash(cache_dentry);
 640
 641         pre_smfs_inode(dir, cache_dir);
 642         pre_smfs_inode(inode, cache_inode);
 643
 644         SMFS_PRE_HOOK(dir, HOOK_RMDIR, &msg);
 645
 646         rc = cache_dir->i_op->rmdir(cache_dir, cache_dentry);
 647
 648         SMFS_POST_HOOK(dir, HOOK_RMDIR, &msg, rc);
 649         if (!rc) {
 650                 if (inode->i_nlink != 2)
 651                         CWARN("Directory #%lu under rmdir has %i nlinks\n",
 652                                 inode->i_ino, inode->i_nlink);
 653                 inode->i_nlink = 0;
 654                 dir->i_nlink--;
 655                 post_smfs_inode(dir, cache_dir);
 656                 post_smfs_inode(inode, cache_inode);
 657                 //like vfs_rmdir is doing with inode
 658                 cache_inode->i_flags |= S_DEAD;
 659         }
 660         smfs_trans_commit(dir, handle, 0);
 661         dput(cache_dentry);
 662 exit:
 663         post_smfs_dentry(cache_dentry);
 664         post_smfs_dentry(cache_parent);
 665         RETURN(rc);
 666 }
 667
 668 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 669 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 670                       int mode, int rdev)
 671 #else
 672 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 673                       int mode, dev_t rdev)
 674 #endif
 675 {
 676         struct inode *cache_dir = I2CI(dir);
 677         struct inode *inode = NULL;
 678         struct inode *parent = I2CI(dentry->d_parent->d_inode);
 679         struct dentry *cache_dentry = NULL;
 680         struct dentry *cache_parent = NULL;
 681         void *handle = NULL;
 682         int rc = 0;
 683         struct hook_msg msg = {
 684                 .dentry = dentry,
 685         };
 686
 687         ENTRY;
 688
 689         LASSERT(parent);
 690         LASSERT(cache_dir);
 691         LASSERT(cache_dir->i_op->mknod);
 692
 693         cache_parent = pre_smfs_dentry(NULL, parent, dentry->d_parent);
 694         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 695         if (!cache_parent || !cache_dentry) {
 696                 rc = -ENOMEM;
 697                 goto exit;
 698         }
 699
 700         handle = smfs_trans_start(dir, FSFILT_OP_MKNOD, NULL);
 701         if (IS_ERR(handle)) {
 702                 rc = -ENOSPC;
 703                 goto exit;
 704         }
 705
 706         pre_smfs_inode(dir, cache_dir);
 707
 708         SMFS_PRE_HOOK(dir, HOOK_MKNOD, &msg);
 709
 710         rc = cache_dir->i_op->mknod(cache_dir, cache_dentry, mode, rdev);
 711         if (!rc) {
 712                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode,
 713                                        I2SMI(dir), 0);
 714                 if (inode) {
 715                         //smsf_update_dentry(dentry, cache_dentry);
 716                         d_instantiate(dentry, inode);
 717                 }
 718                 else
 719                         rc = -ENOENT;
 720         }
 721
 722         SMFS_POST_HOOK(dir, HOOK_MKNOD, &msg, rc);
 723
 724         post_smfs_inode(dir, cache_dir);
 725
 726         smfs_trans_commit(dir, handle, 0);
 727
 728 exit:
 729         post_smfs_dentry(cache_dentry);
 730         post_smfs_dentry(cache_parent);
 731         RETURN(rc);
 732 }
 733
 734 static int smfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 735                        struct inode *new_dir,struct dentry *new_dentry)
 736 {
 737         struct inode *cache_old_dir = I2CI(old_dir);
 738         struct inode *cache_new_dir = I2CI(new_dir);
 739         struct inode *new_inode = new_dentry->d_inode;
 740         struct inode *cache_old_inode = I2CI(old_dentry->d_inode);
 741         struct inode *old_parent = I2CI(old_dentry->d_parent->d_inode);
 742         struct inode *new_parent = I2CI(new_dentry->d_parent->d_inode);
 743         struct inode *cache_new_inode = NULL;
 744         struct dentry *cache_old_dentry = NULL;
 745         struct dentry *cache_new_dentry = NULL;
 746         struct dentry *cache_new_parent = NULL;
 747         struct dentry *cache_old_parent = NULL;
 748         void *handle = NULL;
 749         int    rc = 0;
 750         struct hook_rename_msg msg = {
 751                 .dentry = old_dentry,
 752                 .new_dir = new_dir,
 753                 .old_dir = old_dir,
 754                 .new_dentry = new_dentry,
 755         };
 756
 757         ENTRY;
 758
 759         if (!cache_old_dir || !cache_new_dir || !cache_old_inode)
 760                 RETURN(-ENOENT);
 761
 762         if (new_inode) {
 763                 cache_new_inode = I2CI(new_inode);
 764                 if (!cache_new_inode)
 765                         RETURN(-ENOENT);
 766         }
 767
 768         cache_old_parent = pre_smfs_dentry(NULL, old_parent, old_dentry->d_parent);
 769         cache_old_dentry = pre_smfs_dentry(cache_old_parent, cache_old_inode,
 770                                            old_dentry);
 771         if (!cache_old_parent || !cache_old_dentry) {
 772                 rc = -ENOMEM;
 773                 goto exit;
 774         }
 775
 776         cache_new_parent = pre_smfs_dentry(NULL, new_parent, new_dentry->d_parent);
 777         cache_new_dentry = pre_smfs_dentry(cache_new_parent, cache_new_inode,
 778                                            new_dentry);
 779         if (!cache_new_parent || !cache_new_dentry) {
 780                 rc = -ENOMEM;
 781                 goto exit;
 782         }
 783
 784         handle = smfs_trans_start(old_dir, FSFILT_OP_RENAME, NULL);
 785         if (IS_ERR(handle)) {
 786                 rc = -ENOSPC;
 787                 goto exit;
 788         }
 789
 790         pre_smfs_inode(old_dir, cache_old_dir);
 791         pre_smfs_inode(new_dir, cache_new_dir);
 792         pre_smfs_inode(old_dentry->d_inode, cache_old_inode);
 793         if (new_inode)
 794                 pre_smfs_inode(new_inode, cache_new_inode);
 795
 796         SMFS_PRE_HOOK(old_dir, HOOK_RENAME, &msg);
 797
 798         rc = cache_old_dir->i_op->rename(cache_old_dir, cache_old_dentry,
 799                                          cache_new_dir, cache_new_dentry);
 800
 801         SMFS_POST_HOOK(old_dir, HOOK_RENAME, &msg, rc);
 802         if (!rc) {
 803                 post_smfs_inode(old_dir, cache_old_dir);
 804                 post_smfs_inode(new_dir, cache_new_dir);
 805                 post_smfs_inode(old_dentry->d_inode, cache_old_inode);
 806                 if (new_inode) {
 807                         post_smfs_inode(new_inode, cache_new_inode);
 808                         new_inode->i_nlink--;
 809                 }
 810                 //directory is renamed
 811                 if (S_ISDIR(old_dentry->d_inode->i_mode)) {
 812                         old_dir->i_nlink--;
 813                         if (new_inode) {
 814                                 new_inode->i_nlink--;
 815                         } else {
 816                                 new_dir->i_nlink++;
 817                         }
 818                 }
 819         }
 820         smfs_trans_commit(old_dir, handle, 0);
 821
 822 exit:
 823         post_smfs_dentry(cache_old_dentry);
 824         post_smfs_dentry(cache_old_parent);
 825         post_smfs_dentry(cache_new_dentry);
 826         post_smfs_dentry(cache_new_parent);
 827         RETURN(rc);
 828 }
 829
 830 struct inode_operations smfs_dir_iops = {
 831         .create         = smfs_create,
 832         .lookup         = smfs_lookup,
 833 #if HAVE_LOOKUP_RAW
 834         .lookup_raw     = smfs_lookup_raw,
 835 #endif
 836         .link           = smfs_link,
 837         .unlink         = smfs_unlink,
 838         .symlink        = smfs_symlink,
 839         .mkdir          = smfs_mkdir,
 840         .rmdir          = smfs_rmdir,
 841         .mknod          = smfs_mknod,
 842         .rename         = smfs_rename,
 843         .setxattr       = smfs_setxattr,
 844         .getxattr       = smfs_getxattr,
 845         .listxattr      = smfs_listxattr,
 846         .removexattr    = smfs_removexattr,
 847         .permission     = smfs_permission,
 848 };
 849
 850 struct inode_operations smfs_iopen_iops = {
 851         .lookup         = smfs_iopen_lookup,
 852 };
 853
 854 static ssize_t smfs_read_dir(struct file *filp, char *buf,
 855                              size_t size, loff_t *ppos)
 856 {
 857         struct dentry *dentry = filp->f_dentry;
 858         struct inode *cache_inode = NULL;
 859         struct smfs_file_info *sfi = NULL;
 860         loff_t tmp_ppos;
 861         loff_t *cache_ppos = NULL;
 862         int    rc = 0;
 863
 864         ENTRY;
 865
 866         cache_inode = I2CI(dentry->d_inode);
 867
 868         if (!cache_inode || !cache_inode->i_fop->read)
 869                 RETURN(-EINVAL);
 870
 871         sfi = F2SMFI(filp);
 872         if (sfi->magic != SMFS_FILE_MAGIC)
 873                 BUG();
 874
 875         if (ppos != &(filp->f_pos))
 876                 cache_ppos = &tmp_ppos;
 877         else
 878                 cache_ppos = &sfi->c_file->f_pos;
 879
 880         *cache_ppos = *ppos;
 881
 882         rc = cache_inode->i_fop->read(sfi->c_file, buf, size, cache_ppos);
 883         if (rc)
 884                 RETURN(rc);
 885
 886         *ppos = *cache_ppos;
 887
 888         duplicate_file(filp, sfi->c_file);
 889
 890         RETURN(rc);
 891 }
 892
 893 static int smfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 894 {
 895         struct dentry *dentry = filp->f_dentry;
 896         struct inode *cache_inode = NULL;
 897         struct smfs_file_info *sfi = NULL;
 898         int    rc = 0;
 899
 900         ENTRY;
 901
 902         cache_inode = I2CI(dentry->d_inode);
 903         if (!cache_inode || !cache_inode->i_fop->readdir)
 904                 RETURN(-EINVAL);
 905
 906         sfi = F2SMFI(filp);
 907         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 908
 909         rc = cache_inode->i_fop->readdir(sfi->c_file, dirent, filldir);
 910
 911         duplicate_file(filp, sfi->c_file);
 912
 913         RETURN(rc);
 914 }
 915
 916 struct file_operations smfs_dir_fops = {
 917         .read           = smfs_read_dir,
 918         .readdir        = smfs_readdir,       /* BKL held */
 919         .ioctl          = smfs_ioctl,         /* BKL held */
 920         .fsync          = smfs_fsync,         /* BKL held */
 921         .open           = smfs_open,
 922         .release        = smfs_release,
 923 };
 924
 925 struct file_operations smfs_iopen_fops = {
 926         .read           = smfs_read_dir,
 927 };
 928