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
  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  *cache_dir = NULL;
  54         struct dentry *cache_dentry = NULL;
  55         struct dentry *cache_parent = NULL;
  56         void *handle = NULL;
  57         struct hook_msg msg = {
  58                 .dir = dir,
  59                 .dentry = dentry,
  60         };
  61         int rc = 0;
  62
  63         ENTRY;
  64
  65         cache_dir = I2CI(dir);
  66         LASSERT(cache_dir);
  67         LASSERT(cache_dir->i_op->create);
  68
  69         //lock_kernel();
  70         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
  71         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
  72         if (!cache_dentry || !cache_parent) {
  73                 rc = -ENOMEM;
  74                 goto exit;
  75         }
  76
  77         handle = smfs_trans_start(dir, FSFILT_OP_CREATE, NULL);
  78         if (IS_ERR(handle)) {
  79                 rc = -ENOSPC;
  80                 goto exit;
  81         }
  82
  83         SMFS_PRE_HOOK(dir->i_sb, HOOK_CREATE, &msg);
  84
  85         pre_smfs_inode(dir, cache_dir);
  86
  87 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  88         rc = cache_dir->i_op->create(cache_dir, cache_dentry, mode);
  89 #else
  90         rc = cache_dir->i_op->create(cache_dir, cache_dentry, mode, nd);
  91 #endif
  92         if (!rc) {
  93                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode->i_ino, dir, 0);
  94                 if (inode)
  95                         d_instantiate(dentry, inode);
  96                 else
  97                         rc = -ENOENT;
  98         }
  99
 100         SMFS_POST_HOOK(dir->i_sb, HOOK_CREATE, &msg, rc);
 101
 102         post_smfs_inode(dir, cache_dir);
 103         smfs_trans_commit(dir, handle, 0);
 104
 105 exit:
 106         //unlock_kernel();
 107         post_smfs_dentry(cache_dentry);
 108         post_smfs_dentry(cache_parent);
 109         RETURN(rc);
 110 }
 111
 112 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 113 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry)
 114 #else
 115 static struct dentry *smfs_lookup(struct inode *dir, struct dentry *dentry,
 116                                   struct nameidata *nd)
 117 #endif
 118 {
 119         struct inode *cache_dir;
 120         struct inode *inode = NULL;
 121         struct inode * cache_inode = NULL;
 122         struct dentry *cache_dentry = NULL;
 123         struct dentry *cache_parent = NULL;
 124         struct dentry *rdentry = NULL;
 125         int rc = 0;
 126         struct hook_msg msg = {
 127                 .dir = dir,
 128                 .dentry = dentry,
 129         };
 130
 131         ENTRY;
 132
 133         cache_dir = I2CI(dir);
 134         if (!cache_dir)
 135                 RETURN(ERR_PTR(-ENOENT));
 136
 137         LASSERT(cache_dir->i_op->lookup);
 138
 139         /* preparing artificial backing fs dentries. */
 140         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry->d_parent);
 141         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 142         if (!cache_dentry || !cache_parent)
 143                 RETURN(ERR_PTR(-ENOMEM));
 144
 145         SMFS_PRE_HOOK(dir->i_sb, HOOK_LOOKUP, &msg);
 146
 147         /* perform lookup in backing fs. */
 148 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 149         rdentry = cache_dir->i_op->lookup(cache_dir, cache_dentry);
 150 #else
 151         rdentry = cache_dir->i_op->lookup(cache_dir, cache_dentry, nd);
 152 #endif
 153         if (rdentry) {
 154                 if (IS_ERR(rdentry))
 155                         rc = PTR_ERR(rdentry);
 156                 else {
 157                         cache_inode = rdentry->d_inode;
 158                         dput(rdentry);
 159                 }
 160         } else {
 161                 cache_inode = cache_dentry->d_inode;
 162         }
 163
 164         if (cache_inode) {
 165                 inode = smfs_get_inode(dir->i_sb, cache_inode->i_ino, dir,0);
 166                 if (!inode)
 167                         rc = -ENOENT;
 168         }
 169
 170         if (!rc)
 171                 d_add(dentry, inode);
 172
 173         SMFS_POST_HOOK(dir->i_sb, HOOK_LOOKUP, &msg, rc);
 174 exit:
 175         post_smfs_dentry(cache_dentry);
 176         post_smfs_dentry(cache_parent);
 177         RETURN(ERR_PTR(rc));
 178 }
 179
 180 static int smfs_link(struct dentry *old_dentry,
 181                      struct inode *dir, struct dentry *dentry)
 182 {
 183         struct inode *cache_old_inode = NULL;
 184         struct inode *cache_dir = NULL;
 185         struct inode *old_inode = NULL;
 186         struct dentry *cache_dentry = NULL;
 187         struct dentry *cache_old_dentry = NULL;
 188         struct dentry *cache_parent = NULL;
 189         void *handle = NULL;
 190         int rc = 0;
 191         struct hook_msg msg = {
 192                 .dir = dir,
 193                 .dentry = old_dentry,
 194         };
 195
 196         ENTRY;
 197
 198         cache_dir = I2CI(dir);
 199         if (!cache_dir)
 200                 RETURN(-ENOENT);
 201
 202         old_inode = old_dentry->d_inode;
 203         cache_old_inode = I2CI(old_inode);
 204         if (!cache_old_inode)
 205                 RETURN(-ENOENT);
 206
 207         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
 208         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 209         cache_old_dentry = pre_smfs_dentry(NULL, cache_old_inode, old_dentry);
 210         if (!cache_old_dentry || !cache_dentry || !cache_parent) {
 211                 rc = -ENOMEM;
 212                 goto exit;
 213         }
 214
 215         handle = smfs_trans_start(dir, FSFILT_OP_LINK, NULL);
 216         if (IS_ERR(handle)) {
 217                  rc = -ENOSPC;
 218                  goto exit;
 219         }
 220
 221         pre_smfs_inode(dir, cache_dir);
 222         pre_smfs_inode(old_inode, cache_old_inode);
 223
 224         //lock_kernel();
 225         SMFS_PRE_HOOK(dir->i_sb, HOOK_LINK, &msg);
 226
 227         rc = cache_dir->i_op->link(cache_old_dentry, cache_dir, cache_dentry);
 228         if (!rc) {
 229                 atomic_inc(&old_inode->i_count);
 230                 d_instantiate(dentry, old_inode);
 231         }
 232
 233         SMFS_POST_HOOK(dir->i_sb, HOOK_LINK, &msg, rc);
 234
 235         post_smfs_inode(old_inode, cache_old_inode);
 236         post_smfs_inode(dir, cache_dir);
 237
 238         smfs_trans_commit(dir, handle, 0);
 239
 240 exit:
 241         //unlock_kernel();
 242         post_smfs_dentry(cache_dentry);
 243         post_smfs_dentry(cache_parent);
 244         post_smfs_dentry(cache_old_dentry);
 245
 246         RETURN(rc);
 247 }
 248
 249 static int smfs_unlink(struct inode * dir, struct dentry *dentry)
 250 {
 251         struct inode *cache_dir = I2CI(dir);
 252         struct inode *cache_inode = I2CI(dentry->d_inode);
 253         struct dentry *cache_dentry;
 254         struct dentry *cache_parent;
 255         void   *handle = NULL;
 256         int    rc = 0;
 257         //int    mode = 0;
 258         struct hook_unlink_msg msg = {
 259                 .dir = dir,
 260                 .dentry = dentry,
 261                 .mode = 0
 262         };
 263
 264         ENTRY;
 265
 266         if (!cache_dir || !cache_inode || !cache_dir->i_op->unlink)
 267                 RETURN(-ENOENT);
 268
 269         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
 270         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 271         if (!cache_dentry || !cache_parent) {
 272                 rc = -ENOMEM;
 273                 goto exit;
 274         }
 275
 276         //lock_kernel();
 277         handle = smfs_trans_start(dir, FSFILT_OP_UNLINK, NULL);
 278         if (IS_ERR(handle)) {
 279                 rc = -ENOSPC;
 280                 goto exit;
 281         }
 282
 283         pre_smfs_inode(dir, cache_dir);
 284         pre_smfs_inode(dentry->d_inode, cache_inode);
 285
 286         SMFS_PRE_HOOK(dir->i_sb, HOOK_UNLINK, &msg);
 287
 288         rc = cache_dir->i_op->unlink(cache_dir, cache_dentry);
 289
 290         SMFS_POST_HOOK(dir->i_sb, HOOK_UNLINK, &msg, rc);
 291
 292         post_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 293         post_smfs_inode(dir, cache_dir);
 294         //unlock_kernel();
 295
 296         smfs_trans_commit(dir, handle, 0);
 297 exit:
 298         post_smfs_dentry(cache_dentry);
 299         post_smfs_dentry(cache_parent);
 300         RETURN(rc);
 301 }
 302
 303 static int smfs_symlink(struct inode *dir, struct dentry *dentry,
 304                         const char *symname)
 305 {
 306         struct inode *cache_dir = I2CI(dir);
 307         struct inode *inode = NULL;
 308         struct dentry *cache_dentry;
 309         struct dentry *cache_parent;
 310         void   *handle = NULL;
 311         int    rc = 0;
 312         struct hook_symlink_msg msg = {
 313                 .dir = dir,
 314                 .dentry = dentry,
 315                 .tgt_len = strlen(symname) + 1,
 316                 .symname = (char*)symname
 317         };
 318
 319         ENTRY;
 320
 321         if (!cache_dir || !cache_dir->i_op->symlink)
 322                 RETURN(-ENOENT);
 323
 324         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
 325         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 326         if (!cache_parent || !cache_dentry) {
 327                 rc = -ENOMEM;
 328                 goto exit;
 329         }
 330
 331         handle = smfs_trans_start(dir, FSFILT_OP_SYMLINK, NULL);
 332         if (IS_ERR(handle)) {
 333                 rc = -ENOSPC;
 334                 goto exit;
 335         }
 336
 337         //lock_kernel();
 338         pre_smfs_inode(dir, cache_dir);
 339
 340         SMFS_PRE_HOOK(dir->i_sb, HOOK_SYMLINK, &msg);
 341
 342         rc = cache_dir->i_op->symlink(cache_dir, cache_dentry, symname);
 343         if (!rc) {
 344                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode->i_ino,
 345                                        dir, 0);
 346                 if (inode)
 347                         d_instantiate(dentry, inode);
 348                 else
 349                         rc = -ENOENT;
 350         }
 351
 352         SMFS_POST_HOOK(dir->i_sb, HOOK_SYMLINK, &msg, rc);
 353
 354         post_smfs_inode(dir, cache_dir);
 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         RETURN(rc);
 362 }
 363
 364 static int smfs_mkdir(struct inode *dir, struct dentry *dentry,
 365                       int mode)
 366 {
 367         struct inode *cache_dir = I2CI(dir);
 368         struct inode *inode = NULL;
 369         struct dentry *cache_dentry;
 370         struct dentry *cache_parent;
 371         void   *handle = NULL;
 372         int    rc = 0;
 373         struct hook_msg msg = {
 374                 .dir = dir,
 375                 .dentry = dentry,
 376         };
 377
 378         ENTRY;
 379
 380         if (!cache_dir)
 381                 RETURN(-ENOENT);
 382
 383         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
 384         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 385
 386         if (!cache_parent || !cache_dentry) {
 387                 rc = -ENOMEM;
 388                 goto exit;
 389         }
 390
 391         handle = smfs_trans_start(dir, FSFILT_OP_MKDIR, NULL);
 392         if (IS_ERR(handle)) {
 393                 rc = -ENOSPC;
 394                 goto exit;
 395         }
 396
 397         pre_smfs_inode(dir, cache_dir);
 398         SMFS_PRE_HOOK(dir->i_sb, HOOK_MKDIR, &msg);
 399
 400         rc = cache_dir->i_op->mkdir(cache_dir, cache_dentry, mode);
 401         if (!rc) {
 402                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode->i_ino,
 403                                        dir, 0);
 404                 if (inode)
 405                         d_instantiate(dentry, inode);
 406                 else
 407                         rc = -ENOENT;
 408         }
 409
 410         SMFS_POST_HOOK(dir->i_sb, HOOK_MKDIR, &msg, rc);
 411         post_smfs_inode(dir, cache_dir);
 412         smfs_trans_commit(dir, handle, 0);
 413
 414 exit:
 415         post_smfs_dentry(cache_dentry);
 416         post_smfs_dentry(cache_parent);
 417         RETURN(rc);
 418 }
 419
 420 static int smfs_rmdir(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 dentry *cache_dentry = NULL;
 425         struct dentry *cache_parent = NULL;
 426         void *handle = NULL;
 427         int    rc = 0;
 428         struct hook_unlink_msg msg = {
 429                 .dir = dir,
 430                 .dentry = dentry,
 431                 .mode = S_IFDIR
 432         };
 433
 434         ENTRY;
 435
 436         if (!cache_dir || !cache_dir->i_op->rmdir)
 437                 RETURN(-ENOENT);
 438
 439         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry);
 440         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
 441         if (!cache_parent || !cache_dentry) {
 442                 rc = -ENOMEM;
 443                 goto exit;
 444         }
 445
 446         handle = smfs_trans_start(dir, FSFILT_OP_RMDIR, NULL);
 447         if (IS_ERR(handle) ) {
 448                 rc = -ENOSPC;
 449                 goto exit;
 450         }
 451
 452         pre_smfs_inode(dir, cache_dir);
 453         pre_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 454
 455         SMFS_PRE_HOOK(dir->i_sb, HOOK_RMDIR, &msg);
 456
 457         rc = cache_dir->i_op->rmdir(cache_dir, cache_dentry);
 458
 459         SMFS_POST_HOOK(dir->i_sb, HOOK_RMDIR, &msg, rc);
 460
 461         post_smfs_inode(dir, cache_dir);
 462         post_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 463
 464         smfs_trans_commit(dir, handle, 0);
 465
 466 exit:
 467         post_smfs_dentry(cache_dentry);
 468         post_smfs_dentry(cache_parent);
 469         RETURN(rc);
 470 }
 471
 472 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 473 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 474                       int mode, int rdev)
 475 #else
 476 static int smfs_mknod(struct inode *dir, struct dentry *dentry,
 477                       int mode, dev_t rdev)
 478 #endif
 479 {
 480         struct inode *cache_dir = I2CI(dir);
 481         struct inode *inode = NULL;
 482         struct dentry *cache_dentry = NULL;
 483         struct dentry *cache_parent = NULL;
 484         void *handle = NULL;
 485         int rc = 0;
 486         struct hook_msg msg = {
 487                 .dir = dir,
 488                 .dentry = dentry,
 489         };
 490
 491         ENTRY;
 492
 493         if (!cache_dir || !cache_dir->i_op->mknod)
 494                 RETURN(-ENOENT);
 495
 496         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry->d_parent);
 497         cache_dentry = pre_smfs_dentry(cache_parent, NULL, dentry);
 498         if (!cache_parent || !cache_dentry) {
 499                 rc = -ENOMEM;
 500                 goto exit;
 501         }
 502
 503         handle = smfs_trans_start(dir, FSFILT_OP_MKNOD, NULL);
 504         if (IS_ERR(handle)) {
 505                 rc = -ENOSPC;
 506                 goto exit;
 507         }
 508
 509         pre_smfs_inode(dir, cache_dir);
 510         pre_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 511
 512         SMFS_PRE_HOOK(dir->i_sb, HOOK_MKNOD, &msg);
 513
 514         rc = cache_dir->i_op->mknod(cache_dir, cache_dentry, mode, rdev);
 515         if (!rc) {
 516                 inode = smfs_get_inode(dir->i_sb, cache_dentry->d_inode->i_ino,
 517                                        dir, 0);
 518                 if (inode)
 519                         d_instantiate(dentry, inode);
 520                 else
 521                         rc = -ENOENT;
 522         }
 523
 524         SMFS_POST_HOOK(dir->i_sb, HOOK_MKNOD, &msg, rc);
 525
 526         post_smfs_inode(dir, cache_dir);
 527         post_smfs_inode(dentry->d_inode, cache_dentry->d_inode);
 528         smfs_trans_commit(dir, handle, 0);
 529
 530 exit:
 531         post_smfs_dentry(cache_dentry);
 532         post_smfs_dentry(cache_parent);
 533         RETURN(rc);
 534 }
 535
 536 static int smfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 537                        struct inode *new_dir,struct dentry *new_dentry)
 538 {
 539         struct inode *cache_old_dir = I2CI(old_dir);
 540         struct inode *cache_new_dir = I2CI(new_dir);
 541         struct inode *cache_old_inode = I2CI(old_dentry->d_inode);
 542         struct inode *cache_new_inode = NULL;
 543         struct dentry *cache_old_dentry = NULL;
 544         struct dentry *cache_new_dentry = NULL;
 545         struct dentry *cache_new_parent = NULL;
 546         struct dentry *cache_old_parent = NULL;
 547         void *handle = NULL;
 548         int    rc = 0;
 549         struct hook_rename_msg msg = {
 550                 .dir = old_dir,
 551                 .dentry = old_dentry,
 552                 .new_dir = new_dir,
 553                 .new_dentry = new_dentry
 554         };
 555
 556         ENTRY;
 557
 558         if (!cache_old_dir || !cache_new_dir || !cache_old_inode)
 559                 RETURN(-ENOENT);
 560
 561         if (new_dentry->d_inode) {
 562                 cache_new_inode = I2CI(new_dentry->d_inode);
 563                 if (!cache_new_inode)
 564                         RETURN(-ENOENT);
 565         }
 566
 567         cache_old_parent = pre_smfs_dentry(NULL, cache_old_dir, old_dentry);
 568         cache_old_dentry = pre_smfs_dentry(cache_old_parent, cache_old_inode,
 569                                            old_dentry);
 570         if (!cache_old_parent || !cache_old_dentry) {
 571                 rc = -ENOMEM;
 572                 goto exit;
 573         }
 574
 575         cache_new_parent = pre_smfs_dentry(NULL, cache_new_dir, new_dentry);
 576         cache_new_dentry = pre_smfs_dentry(cache_new_parent, cache_new_inode,
 577                                            new_dentry);
 578         if (!cache_new_parent || !cache_new_dentry) {
 579                 rc = -ENOMEM;
 580                 goto exit;
 581         }
 582
 583         handle = smfs_trans_start(old_dir, FSFILT_OP_RENAME, NULL);
 584         if (IS_ERR(handle)) {
 585                 rc = -ENOSPC;
 586                 goto exit;
 587         }
 588
 589         pre_smfs_inode(old_dir, cache_old_dir);
 590         pre_smfs_inode(new_dir, cache_new_dir);
 591         if (new_dentry->d_inode)
 592                 pre_smfs_inode(new_dentry->d_inode, cache_new_dentry->d_inode);
 593
 594         SMFS_PRE_HOOK(old_dir->i_sb, HOOK_RENAME, &msg);
 595
 596         rc = cache_old_dir->i_op->rename(cache_old_dir, cache_old_dentry,
 597                                          cache_new_dir, cache_new_dentry);
 598
 599         SMFS_POST_HOOK(old_dir->i_sb, HOOK_RENAME, &msg, rc);
 600
 601         post_smfs_inode(old_dir, cache_old_dir);
 602         post_smfs_inode(new_dir, cache_new_dir);
 603         if (new_dentry->d_inode)
 604                 post_smfs_inode(new_dentry->d_inode, cache_new_dentry->d_inode);
 605
 606         smfs_trans_commit(old_dir, handle, 0);
 607
 608 exit:
 609         post_smfs_dentry(cache_old_dentry);
 610         post_smfs_dentry(cache_old_parent);
 611         post_smfs_dentry(cache_new_dentry);
 612         post_smfs_dentry(cache_new_parent);
 613         RETURN(rc);
 614 }
 615
 616 struct inode_operations smfs_dir_iops = {
 617         create:         smfs_create,
 618         lookup:         smfs_lookup,
 619         link:           smfs_link,              /* BKL held */
 620         unlink:         smfs_unlink,            /* BKL held */
 621         symlink:        smfs_symlink,           /* BKL held */
 622         mkdir:          smfs_mkdir,             /* BKL held */
 623         rmdir:          smfs_rmdir,             /* BKL held */
 624         mknod:          smfs_mknod,             /* BKL held */
 625         rename:         smfs_rename,            /* BKL held */
 626         setxattr:       smfs_setxattr,          /* BKL held */
 627         getxattr:       smfs_getxattr,          /* BKL held */
 628         listxattr:      smfs_listxattr,         /* BKL held */
 629         removexattr:    smfs_removexattr,       /* BKL held */
 630 };
 631
 632 static ssize_t smfs_read_dir(struct file *filp, char *buf,
 633                              size_t size, loff_t *ppos)
 634 {
 635         struct dentry *dentry = filp->f_dentry;
 636         struct inode *cache_inode = NULL;
 637         struct smfs_file_info *sfi = NULL;
 638         loff_t tmp_ppos;
 639         loff_t *cache_ppos = NULL;
 640         int    rc = 0;
 641
 642         ENTRY;
 643
 644         cache_inode = I2CI(dentry->d_inode);
 645
 646         if (!cache_inode || !cache_inode->i_fop->read)
 647                 RETURN(-EINVAL);
 648
 649         sfi = F2SMFI(filp);
 650         if (sfi->magic != SMFS_FILE_MAGIC)
 651                 BUG();
 652
 653         if (ppos != &(filp->f_pos))
 654                 cache_ppos = &tmp_ppos;
 655         else
 656                 cache_ppos = &sfi->c_file->f_pos;
 657
 658         *cache_ppos = *ppos;
 659
 660         rc = cache_inode->i_fop->read(sfi->c_file, buf, size, cache_ppos);
 661         if (rc)
 662                 RETURN(rc);
 663
 664         *ppos = *cache_ppos;
 665
 666         duplicate_file(filp, sfi->c_file);
 667
 668         RETURN(rc);
 669 }
 670
 671 static int smfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 672 {
 673         struct dentry *dentry = filp->f_dentry;
 674         struct inode *cache_inode = NULL;
 675         struct smfs_file_info *sfi = NULL;
 676         int    rc = 0;
 677         struct hook_readdir_msg msg = {
 678                 .dir = dentry->d_inode,
 679                 .dentry = dentry,
 680                 .filp = filp,
 681                 .dirent = dirent,
 682                 .filldir = filldir
 683         };
 684
 685         ENTRY;
 686
 687         cache_inode = I2CI(dentry->d_inode);
 688         if (!cache_inode || !cache_inode->i_fop->readdir)
 689                 RETURN(-EINVAL);
 690
 691         sfi = F2SMFI(filp);
 692         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 693
 694         SMFS_PRE_HOOK(dentry->d_inode->i_sb, HOOK_READDIR, &msg);
 695
 696         rc = cache_inode->i_fop->readdir(sfi->c_file, dirent, filldir);
 697
 698         SMFS_POST_HOOK(dentry->d_inode->i_sb, HOOK_READDIR, &msg, rc);
 699         duplicate_file(filp, sfi->c_file);
 700
 701 exit:
 702         if (rc > 0)
 703                 rc = 0;
 704
 705         RETURN(rc);
 706 }
 707
 708 struct file_operations smfs_dir_fops = {
 709         .read           = smfs_read_dir,
 710         .readdir        = smfs_readdir,       /* BKL held */
 711         .ioctl          = smfs_ioctl,         /* BKL held */
 712         .fsync          = smfs_fsync,         /* BKL held */
 713         .open           = smfs_open,
 714         .release        = smfs_release,
 715 };