lustre/smfs/dir.c

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