fs/ecryptfs/inode.c

   1 /**
   2  * eCryptfs: Linux filesystem encryption layer
   3  *
   4  * Copyright (C) 1997-2004 Erez Zadok
   5  * Copyright (C) 2001-2004 Stony Brook University
   6  * Copyright (C) 2004-2007 International Business Machines Corp.
   7  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
   8  *              Michael C. Thompsion <mcthomps@us.ibm.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of the
  13  * License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  23  * 02111-1307, USA.
  24  */
  25
  26 #include <linux/file.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/pagemap.h>
  29 #include <linux/dcache.h>
  30 #include <linux/namei.h>
  31 #include <linux/mount.h>
  32 #include <linux/crypto.h>
  33 #include <linux/fs_stack.h>
  34 #include <linux/slab.h>
  35 #include <linux/xattr.h>
  36 #include <asm/unaligned.h>
  37 #include "ecryptfs_kernel.h"
  38
  39 static struct dentry *lock_parent(struct dentry *dentry)
  40 {
  41         struct dentry *dir;
  42
  43         dir = dget_parent(dentry);
  44         mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
  45         return dir;
  46 }
  47
  48 static void unlock_dir(struct dentry *dir)
  49 {
  50         mutex_unlock(&dir->d_inode->i_mutex);
  51         dput(dir);
  52 }
  53
  54 /**
  55  * ecryptfs_create_underlying_file
  56  * @lower_dir_inode: inode of the parent in the lower fs of the new file
  57  * @dentry: New file's dentry
  58  * @mode: The mode of the new file
  59  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
  60  *
  61  * Creates the file in the lower file system.
  62  *
  63  * Returns zero on success; non-zero on error condition
  64  */
  65 static int
  66 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
  67                                 struct dentry *dentry, int mode,
  68                                 struct nameidata *nd)
  69 {
  70         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
  71         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
  72         struct dentry *dentry_save;
  73         struct vfsmount *vfsmount_save;
  74         unsigned int flags_save;
  75         int rc;
  76
  77         if (nd) {
  78                 dentry_save = nd->path.dentry;
  79                 vfsmount_save = nd->path.mnt;
  80                 flags_save = nd->flags;
  81                 nd->path.dentry = lower_dentry;
  82                 nd->path.mnt = lower_mnt;
  83                 nd->flags &= ~LOOKUP_OPEN;
  84         }
  85         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
  86         if (nd) {
  87                 nd->path.dentry = dentry_save;
  88                 nd->path.mnt = vfsmount_save;
  89                 nd->flags = flags_save;
  90         }
  91         return rc;
  92 }
  93
  94 /**
  95  * ecryptfs_do_create
  96  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
  97  * @ecryptfs_dentry: New file's dentry in ecryptfs
  98  * @mode: The mode of the new file
  99  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 100  *
 101  * Creates the underlying file and the eCryptfs inode which will link to
 102  * it. It will also update the eCryptfs directory inode to mimic the
 103  * stat of the lower directory inode.
 104  *
 105  * Returns zero on success; non-zero on error condition
 106  */
 107 static int
 108 ecryptfs_do_create(struct inode *directory_inode,
 109                    struct dentry *ecryptfs_dentry, int mode,
 110                    struct nameidata *nd)
 111 {
 112         int rc;
 113         struct dentry *lower_dentry;
 114         struct dentry *lower_dir_dentry;
 115
 116         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 117         lower_dir_dentry = lock_parent(lower_dentry);
 118         if (IS_ERR(lower_dir_dentry)) {
 119                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 120                                 "dentry\n");
 121                 rc = PTR_ERR(lower_dir_dentry);
 122                 goto out;
 123         }
 124         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 125                                              ecryptfs_dentry, mode, nd);
 126         if (rc) {
 127                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 128                        "rc = [%d]\n", __func__, rc);
 129                 goto out_lock;
 130         }
 131         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 132                                 directory_inode->i_sb, 0);
 133         if (rc) {
 134                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 135                 goto out_lock;
 136         }
 137         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 138         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 139 out_lock:
 140         unlock_dir(lower_dir_dentry);
 141 out:
 142         return rc;
 143 }
 144
 145 /**
 146  * grow_file
 147  * @ecryptfs_dentry: the eCryptfs dentry
 148  *
 149  * This is the code which will grow the file to its correct size.
 150  */
 151 static int grow_file(struct dentry *ecryptfs_dentry)
 152 {
 153         struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
 154         char zero_virt[] = { 0x00 };
 155         int rc = 0;
 156
 157         rc = ecryptfs_write(ecryptfs_inode, zero_virt, 0, 1);
 158         i_size_write(ecryptfs_inode, 0);
 159         rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
 160         ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
 161                 ECRYPTFS_NEW_FILE;
 162         return rc;
 163 }
 164
 165 /**
 166  * ecryptfs_initialize_file
 167  *
 168  * Cause the file to be changed from a basic empty file to an ecryptfs
 169  * file with a header and first data page.
 170  *
 171  * Returns zero on success
 172  */
 173 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 174 {
 175         struct ecryptfs_crypt_stat *crypt_stat =
 176                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 177         int rc = 0;
 178
 179         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 180                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 181                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 182                 goto out;
 183         }
 184         crypt_stat->flags |= ECRYPTFS_NEW_FILE;
 185         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 186         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 187         if (rc) {
 188                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 189                                 "context; rc = [%d]\n", rc);
 190                 goto out;
 191         }
 192         rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 193         if (rc) {
 194                 printk(KERN_ERR "%s: Error attempting to initialize "
 195                         "the persistent file for the dentry with name "
 196                         "[%s]; rc = [%d]\n", __func__,
 197                         ecryptfs_dentry->d_name.name, rc);
 198                 goto out;
 199         }
 200         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 201         if (rc) {
 202                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 203                 goto out;
 204         }
 205         rc = grow_file(ecryptfs_dentry);
 206         if (rc)
 207                 printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
 208 out:
 209         return rc;
 210 }
 211
 212 /**
 213  * ecryptfs_create
 214  * @dir: The inode of the directory in which to create the file.
 215  * @dentry: The eCryptfs dentry
 216  * @mode: The mode of the new file.
 217  * @nd: nameidata
 218  *
 219  * Creates a new file.
 220  *
 221  * Returns zero on success; non-zero on error condition
 222  */
 223 static int
 224 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 225                 int mode, struct nameidata *nd)
 226 {
 227         int rc;
 228
 229         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 230         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 231         if (unlikely(rc)) {
 232                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 233                                 "lower filesystem\n");
 234                 goto out;
 235         }
 236         /* At this point, a file exists on "disk"; we need to make sure
 237          * that this on disk file is prepared to be an ecryptfs file */
 238         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 239 out:
 240         return rc;
 241 }
 242
 243 /**
 244  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
 245  */
 246 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 247                                         struct dentry *lower_dentry,
 248                                         struct inode *ecryptfs_dir_inode)
 249 {
 250         struct dentry *lower_dir_dentry;
 251         struct vfsmount *lower_mnt;
 252         struct inode *lower_inode;
 253         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 254         struct ecryptfs_crypt_stat *crypt_stat;
 255         char *page_virt = NULL;
 256         u64 file_size;
 257         int rc = 0;
 258
 259         lower_dir_dentry = lower_dentry->d_parent;
 260         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 261                                    ecryptfs_dentry->d_parent));
 262         lower_inode = lower_dentry->d_inode;
 263         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
 264         BUG_ON(!lower_dentry->d_count);
 265         ecryptfs_set_dentry_private(ecryptfs_dentry,
 266                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
 267                                                      GFP_KERNEL));
 268         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
 269                 rc = -ENOMEM;
 270                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 271                        "to allocate ecryptfs_dentry_info struct\n",
 272                         __func__);
 273                 goto out_put;
 274         }
 275         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 276         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
 277         if (!lower_dentry->d_inode) {
 278                 /* We want to add because we couldn't find in lower */
 279                 d_add(ecryptfs_dentry, NULL);
 280                 goto out;
 281         }
 282         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 283                                 ecryptfs_dir_inode->i_sb,
 284                                 ECRYPTFS_INTERPOSE_FLAG_D_ADD);
 285         if (rc) {
 286                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
 287                        __func__, rc);
 288                 goto out;
 289         }
 290         if (S_ISDIR(lower_inode->i_mode))
 291                 goto out;
 292         if (S_ISLNK(lower_inode->i_mode))
 293                 goto out;
 294         if (special_file(lower_inode->i_mode))
 295                 goto out;
 296         /* Released in this function */
 297         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
 298         if (!page_virt) {
 299                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
 300                        __func__);
 301                 rc = -ENOMEM;
 302                 goto out;
 303         }
 304         rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 305         if (rc) {
 306                 printk(KERN_ERR "%s: Error attempting to initialize "
 307                         "the persistent file for the dentry with name "
 308                         "[%s]; rc = [%d]\n", __func__,
 309                         ecryptfs_dentry->d_name.name, rc);
 310                 goto out_free_kmem;
 311         }
 312         crypt_stat = &ecryptfs_inode_to_private(
 313                                         ecryptfs_dentry->d_inode)->crypt_stat;
 314         /* TODO: lock for crypt_stat comparison */
 315         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 316                         ecryptfs_set_default_sizes(crypt_stat);
 317         rc = ecryptfs_read_and_validate_header_region(page_virt,
 318                                                       ecryptfs_dentry->d_inode);
 319         if (rc) {
 320                 memset(page_virt, 0, PAGE_CACHE_SIZE);
 321                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 322                                                              ecryptfs_dentry);
 323                 if (rc) {
 324                         rc = 0;
 325                         goto out_free_kmem;
 326                 }
 327                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 328         }
 329         mount_crypt_stat = &ecryptfs_superblock_to_private(
 330                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 331         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
 332                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 333                         file_size = (crypt_stat->metadata_size
 334                                      + i_size_read(lower_dentry->d_inode));
 335                 else
 336                         file_size = i_size_read(lower_dentry->d_inode);
 337         } else {
 338                 file_size = get_unaligned_be64(page_virt);
 339         }
 340         i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
 341 out_free_kmem:
 342         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 343         goto out;
 344 out_put:
 345         dput(lower_dentry);
 346         mntput(lower_mnt);
 347         d_drop(ecryptfs_dentry);
 348 out:
 349         return rc;
 350 }
 351
 352 /**
 353  * ecryptfs_lookup
 354  * @ecryptfs_dir_inode: The eCryptfs directory inode
 355  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 356  * @ecryptfs_nd: nameidata; may be NULL
 357  *
 358  * Find a file on disk. If the file does not exist, then we'll add it to the
 359  * dentry cache and continue on to read it from the disk.
 360  */
 361 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 362                                       struct dentry *ecryptfs_dentry,
 363                                       struct nameidata *ecryptfs_nd)
 364 {
 365         char *encrypted_and_encoded_name = NULL;
 366         size_t encrypted_and_encoded_name_size;
 367         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 368         struct dentry *lower_dir_dentry, *lower_dentry;
 369         int rc = 0;
 370
 371         if ((ecryptfs_dentry->d_name.len == 1
 372              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 373             || (ecryptfs_dentry->d_name.len == 2
 374                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 375                 goto out_d_drop;
 376         }
 377         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 378         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 379         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 380                                       lower_dir_dentry,
 381                                       ecryptfs_dentry->d_name.len);
 382         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 383         if (IS_ERR(lower_dentry)) {
 384                 rc = PTR_ERR(lower_dentry);
 385                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 386                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 387                                 encrypted_and_encoded_name);
 388                 goto out_d_drop;
 389         }
 390         if (lower_dentry->d_inode)
 391                 goto lookup_and_interpose;
 392         mount_crypt_stat = &ecryptfs_superblock_to_private(
 393                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 394         if (!(mount_crypt_stat
 395             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 396                 goto lookup_and_interpose;
 397         dput(lower_dentry);
 398         rc = ecryptfs_encrypt_and_encode_filename(
 399                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 400                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 401                 ecryptfs_dentry->d_name.len);
 402         if (rc) {
 403                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 404                        "filename; rc = [%d]\n", __func__, rc);
 405                 goto out_d_drop;
 406         }
 407         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 408         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 409                                       lower_dir_dentry,
 410                                       encrypted_and_encoded_name_size);
 411         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 412         if (IS_ERR(lower_dentry)) {
 413                 rc = PTR_ERR(lower_dentry);
 414                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 415                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 416                                 encrypted_and_encoded_name);
 417                 goto out_d_drop;
 418         }
 419 lookup_and_interpose:
 420         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
 421                                                  ecryptfs_dir_inode);
 422         goto out;
 423 out_d_drop:
 424         d_drop(ecryptfs_dentry);
 425 out:
 426         kfree(encrypted_and_encoded_name);
 427         return ERR_PTR(rc);
 428 }
 429
 430 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 431                          struct dentry *new_dentry)
 432 {
 433         struct dentry *lower_old_dentry;
 434         struct dentry *lower_new_dentry;
 435         struct dentry *lower_dir_dentry;
 436         u64 file_size_save;
 437         int rc;
 438
 439         file_size_save = i_size_read(old_dentry->d_inode);
 440         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 441         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 442         dget(lower_old_dentry);
 443         dget(lower_new_dentry);
 444         lower_dir_dentry = lock_parent(lower_new_dentry);
 445         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 446                       lower_new_dentry);
 447         if (rc || !lower_new_dentry->d_inode)
 448                 goto out_lock;
 449         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
 450         if (rc)
 451                 goto out_lock;
 452         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 453         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 454         old_dentry->d_inode->i_nlink =
 455                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 456         i_size_write(new_dentry->d_inode, file_size_save);
 457 out_lock:
 458         unlock_dir(lower_dir_dentry);
 459         dput(lower_new_dentry);
 460         dput(lower_old_dentry);
 461         return rc;
 462 }
 463
 464 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 465 {
 466         int rc = 0;
 467         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 468         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 469         struct dentry *lower_dir_dentry;
 470
 471         dget(lower_dentry);
 472         lower_dir_dentry = lock_parent(lower_dentry);
 473         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 474         if (rc) {
 475                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 476                 goto out_unlock;
 477         }
 478         fsstack_copy_attr_times(dir, lower_dir_inode);
 479         dentry->d_inode->i_nlink =
 480                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 481         dentry->d_inode->i_ctime = dir->i_ctime;
 482         d_drop(dentry);
 483 out_unlock:
 484         unlock_dir(lower_dir_dentry);
 485         dput(lower_dentry);
 486         return rc;
 487 }
 488
 489 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 490                             const char *symname)
 491 {
 492         int rc;
 493         struct dentry *lower_dentry;
 494         struct dentry *lower_dir_dentry;
 495         char *encoded_symname;
 496         size_t encoded_symlen;
 497         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 498
 499         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 500         dget(lower_dentry);
 501         lower_dir_dentry = lock_parent(lower_dentry);
 502         mount_crypt_stat = &ecryptfs_superblock_to_private(
 503                 dir->i_sb)->mount_crypt_stat;
 504         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 505                                                   &encoded_symlen,
 506                                                   NULL,
 507                                                   mount_crypt_stat, symname,
 508                                                   strlen(symname));
 509         if (rc)
 510                 goto out_lock;
 511         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 512                          encoded_symname);
 513         kfree(encoded_symname);
 514         if (rc || !lower_dentry->d_inode)
 515                 goto out_lock;
 516         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 517         if (rc)
 518                 goto out_lock;
 519         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 520         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 521 out_lock:
 522         unlock_dir(lower_dir_dentry);
 523         dput(lower_dentry);
 524         if (!dentry->d_inode)
 525                 d_drop(dentry);
 526         return rc;
 527 }
 528
 529 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 530 {
 531         int rc;
 532         struct dentry *lower_dentry;
 533         struct dentry *lower_dir_dentry;
 534
 535         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 536         lower_dir_dentry = lock_parent(lower_dentry);
 537         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 538         if (rc || !lower_dentry->d_inode)
 539                 goto out;
 540         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 541         if (rc)
 542                 goto out;
 543         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 544         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 545         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 546 out:
 547         unlock_dir(lower_dir_dentry);
 548         if (!dentry->d_inode)
 549                 d_drop(dentry);
 550         return rc;
 551 }
 552
 553 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 554 {
 555         struct dentry *lower_dentry;
 556         struct dentry *lower_dir_dentry;
 557         int rc;
 558
 559         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 560         dget(dentry);
 561         lower_dir_dentry = lock_parent(lower_dentry);
 562         dget(lower_dentry);
 563         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 564         dput(lower_dentry);
 565         if (!rc)
 566                 d_delete(lower_dentry);
 567         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 568         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 569         unlock_dir(lower_dir_dentry);
 570         if (!rc)
 571                 d_drop(dentry);
 572         dput(dentry);
 573         return rc;
 574 }
 575
 576 static int
 577 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 578 {
 579         int rc;
 580         struct dentry *lower_dentry;
 581         struct dentry *lower_dir_dentry;
 582
 583         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 584         lower_dir_dentry = lock_parent(lower_dentry);
 585         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 586         if (rc || !lower_dentry->d_inode)
 587                 goto out;
 588         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 589         if (rc)
 590                 goto out;
 591         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 592         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 593 out:
 594         unlock_dir(lower_dir_dentry);
 595         if (!dentry->d_inode)
 596                 d_drop(dentry);
 597         return rc;
 598 }
 599
 600 static int
 601 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 602                 struct inode *new_dir, struct dentry *new_dentry)
 603 {
 604         int rc;
 605         struct dentry *lower_old_dentry;
 606         struct dentry *lower_new_dentry;
 607         struct dentry *lower_old_dir_dentry;
 608         struct dentry *lower_new_dir_dentry;
 609         struct dentry *trap = NULL;
 610
 611         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 612         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 613         dget(lower_old_dentry);
 614         dget(lower_new_dentry);
 615         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 616         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 617         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 618         /* source should not be ancestor of target */
 619         if (trap == lower_old_dentry) {
 620                 rc = -EINVAL;
 621                 goto out_lock;
 622         }
 623         /* target should not be ancestor of source */
 624         if (trap == lower_new_dentry) {
 625                 rc = -ENOTEMPTY;
 626                 goto out_lock;
 627         }
 628         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 629                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 630         if (rc)
 631                 goto out_lock;
 632         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 633         if (new_dir != old_dir)
 634                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 635 out_lock:
 636         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 637         dput(lower_new_dentry->d_parent);
 638         dput(lower_old_dentry->d_parent);
 639         dput(lower_new_dentry);
 640         dput(lower_old_dentry);
 641         return rc;
 642 }
 643
 644 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 645                                    size_t *bufsiz)
 646 {
 647         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 648         char *lower_buf;
 649         size_t lower_bufsiz = PATH_MAX;
 650         mm_segment_t old_fs;
 651         int rc;
 652
 653         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 654         if (!lower_buf) {
 655                 rc = -ENOMEM;
 656                 goto out;
 657         }
 658         old_fs = get_fs();
 659         set_fs(get_ds());
 660         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 661                                                    (char __user *)lower_buf,
 662                                                    lower_bufsiz);
 663         set_fs(old_fs);
 664         if (rc < 0)
 665                 goto out;
 666         lower_bufsiz = rc;
 667         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 668                                                   lower_buf, lower_bufsiz);
 669 out:
 670         kfree(lower_buf);
 671         return rc;
 672 }
 673
 674 static int
 675 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 676 {
 677         char *kbuf;
 678         size_t kbufsiz, copied;
 679         int rc;
 680
 681         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 682         if (rc)
 683                 goto out;
 684         copied = min_t(size_t, bufsiz, kbufsiz);
 685         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 686         kfree(kbuf);
 687         fsstack_copy_attr_atime(dentry->d_inode,
 688                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 689 out:
 690         return rc;
 691 }
 692
 693 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 694 {
 695         char *buf;
 696         int len = PAGE_SIZE, rc;
 697         mm_segment_t old_fs;
 698
 699         /* Released in ecryptfs_put_link(); only release here on error */
 700         buf = kmalloc(len, GFP_KERNEL);
 701         if (!buf) {
 702                 buf = ERR_PTR(-ENOMEM);
 703                 goto out;
 704         }
 705         old_fs = get_fs();
 706         set_fs(get_ds());
 707         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 708         set_fs(old_fs);
 709         if (rc < 0) {
 710                 kfree(buf);
 711                 buf = ERR_PTR(rc);
 712         } else
 713                 buf[rc] = '\0';
 714 out:
 715         nd_set_link(nd, buf);
 716         return NULL;
 717 }
 718
 719 static void
 720 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 721 {
 722         char *buf = nd_get_link(nd);
 723         if (!IS_ERR(buf)) {
 724                 /* Free the char* */
 725                 kfree(buf);
 726         }
 727 }
 728
 729 /**
 730  * upper_size_to_lower_size
 731  * @crypt_stat: Crypt_stat associated with file
 732  * @upper_size: Size of the upper file
 733  *
 734  * Calculate the required size of the lower file based on the
 735  * specified size of the upper file. This calculation is based on the
 736  * number of headers in the underlying file and the extent size.
 737  *
 738  * Returns Calculated size of the lower file.
 739  */
 740 static loff_t
 741 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 742                          loff_t upper_size)
 743 {
 744         loff_t lower_size;
 745
 746         lower_size = ecryptfs_lower_header_size(crypt_stat);
 747         if (upper_size != 0) {
 748                 loff_t num_extents;
 749
 750                 num_extents = upper_size >> crypt_stat->extent_shift;
 751                 if (upper_size & ~crypt_stat->extent_mask)
 752                         num_extents++;
 753                 lower_size += (num_extents * crypt_stat->extent_size);
 754         }
 755         return lower_size;
 756 }
 757
 758 /**
 759  * truncate_upper
 760  * @dentry: The ecryptfs layer dentry
 761  * @ia: Address of the ecryptfs inode's attributes
 762  * @lower_ia: Address of the lower inode's attributes
 763  *
 764  * Function to handle truncations modifying the size of the file. Note
 765  * that the file sizes are interpolated. When expanding, we are simply
 766  * writing strings of 0's out. When truncating, we truncate the upper
 767  * inode and update the lower_ia according to the page index
 768  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 769  * the caller must use lower_ia in a call to notify_change() to perform
 770  * the truncation of the lower inode.
 771  *
 772  * Returns zero on success; non-zero otherwise
 773  */
 774 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 775                           struct iattr *lower_ia)
 776 {
 777         int rc = 0;
 778         struct inode *inode = dentry->d_inode;
 779         struct ecryptfs_crypt_stat *crypt_stat;
 780         loff_t i_size = i_size_read(inode);
 781         loff_t lower_size_before_truncate;
 782         loff_t lower_size_after_truncate;
 783
 784         if (unlikely((ia->ia_size == i_size))) {
 785                 lower_ia->ia_valid &= ~ATTR_SIZE;
 786                 goto out;
 787         }
 788         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 789         /* Switch on growing or shrinking file */
 790         if (ia->ia_size > i_size) {
 791                 char zero[] = { 0x00 };
 792
 793                 lower_ia->ia_valid &= ~ATTR_SIZE;
 794                 /* Write a single 0 at the last position of the file;
 795                  * this triggers code that will fill in 0's throughout
 796                  * the intermediate portion of the previous end of the
 797                  * file and the new and of the file */
 798                 rc = ecryptfs_write(inode, zero,
 799                                     (ia->ia_size - 1), 1);
 800         } else { /* ia->ia_size < i_size_read(inode) */
 801                 /* We're chopping off all the pages down to the page
 802                  * in which ia->ia_size is located. Fill in the end of
 803                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 804                  * PAGE_CACHE_SIZE with zeros. */
 805                 size_t num_zeros = (PAGE_CACHE_SIZE
 806                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 807
 808
 809                 /*
 810                  * XXX(truncate) this should really happen at the begginning
 811                  * of ->setattr.  But the code is too messy to that as part
 812                  * of a larger patch.  ecryptfs is also totally missing out
 813                  * on the inode_change_ok check at the beginning of
 814                  * ->setattr while would include this.
 815                  */
 816                 rc = inode_newsize_ok(inode, ia->ia_size);
 817                 if (rc)
 818                         goto out;
 819
 820                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 821                         truncate_setsize(inode, ia->ia_size);
 822                         lower_ia->ia_size = ia->ia_size;
 823                         lower_ia->ia_valid |= ATTR_SIZE;
 824                         goto out;
 825                 }
 826                 if (num_zeros) {
 827                         char *zeros_virt;
 828
 829                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 830                         if (!zeros_virt) {
 831                                 rc = -ENOMEM;
 832                                 goto out;
 833                         }
 834                         rc = ecryptfs_write(inode, zeros_virt,
 835                                             ia->ia_size, num_zeros);
 836                         kfree(zeros_virt);
 837                         if (rc) {
 838                                 printk(KERN_ERR "Error attempting to zero out "
 839                                        "the remainder of the end page on "
 840                                        "reducing truncate; rc = [%d]\n", rc);
 841                                 goto out;
 842                         }
 843                 }
 844                 truncate_setsize(inode, ia->ia_size);
 845                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 846                 if (rc) {
 847                         printk(KERN_ERR "Problem with "
 848                                "ecryptfs_write_inode_size_to_metadata; "
 849                                "rc = [%d]\n", rc);
 850                         goto out;
 851                 }
 852                 /* We are reducing the size of the ecryptfs file, and need to
 853                  * know if we need to reduce the size of the lower file. */
 854                 lower_size_before_truncate =
 855                     upper_size_to_lower_size(crypt_stat, i_size);
 856                 lower_size_after_truncate =
 857                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 858                 if (lower_size_after_truncate < lower_size_before_truncate) {
 859                         lower_ia->ia_size = lower_size_after_truncate;
 860                         lower_ia->ia_valid |= ATTR_SIZE;
 861                 } else
 862                         lower_ia->ia_valid &= ~ATTR_SIZE;
 863         }
 864 out:
 865         return rc;
 866 }
 867
 868 /**
 869  * ecryptfs_truncate
 870  * @dentry: The ecryptfs layer dentry
 871  * @new_length: The length to expand the file to
 872  *
 873  * Simple function that handles the truncation of an eCryptfs inode and
 874  * its corresponding lower inode.
 875  *
 876  * Returns zero on success; non-zero otherwise
 877  */
 878 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 879 {
 880         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 881         struct iattr lower_ia = { .ia_valid = 0 };
 882         int rc;
 883
 884         rc = truncate_upper(dentry, &ia, &lower_ia);
 885         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 886                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 887
 888                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 889                 rc = notify_change(lower_dentry, &lower_ia);
 890                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 891         }
 892         return rc;
 893 }
 894
 895 static int
 896 ecryptfs_permission(struct inode *inode, int mask, unsigned int flags)
 897 {
 898         if (flags & IPERM_FLAG_RCU)
 899                 return -ECHILD;
 900         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 901 }
 902
 903 /**
 904  * ecryptfs_setattr
 905  * @dentry: dentry handle to the inode to modify
 906  * @ia: Structure with flags of what to change and values
 907  *
 908  * Updates the metadata of an inode. If the update is to the size
 909  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 910  * of both the ecryptfs inode and the lower inode.
 911  *
 912  * All other metadata changes will be passed right to the lower filesystem,
 913  * and we will just update our inode to look like the lower.
 914  */
 915 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 916 {
 917         int rc = 0;
 918         struct dentry *lower_dentry;
 919         struct iattr lower_ia;
 920         struct inode *inode;
 921         struct inode *lower_inode;
 922         struct ecryptfs_crypt_stat *crypt_stat;
 923
 924         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 925         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 926                 ecryptfs_init_crypt_stat(crypt_stat);
 927         inode = dentry->d_inode;
 928         lower_inode = ecryptfs_inode_to_lower(inode);
 929         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 930         mutex_lock(&crypt_stat->cs_mutex);
 931         if (S_ISDIR(dentry->d_inode->i_mode))
 932                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 933         else if (S_ISREG(dentry->d_inode->i_mode)
 934                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 935                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 936                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 937
 938                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 939                         dentry->d_sb)->mount_crypt_stat;
 940                 rc = ecryptfs_read_metadata(dentry);
 941                 if (rc) {
 942                         if (!(mount_crypt_stat->flags
 943                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 944                                 rc = -EIO;
 945                                 printk(KERN_WARNING "Either the lower file "
 946                                        "is not in a valid eCryptfs format, "
 947                                        "or the key could not be retrieved. "
 948                                        "Plaintext passthrough mode is not "
 949                                        "enabled; returning -EIO\n");
 950                                 mutex_unlock(&crypt_stat->cs_mutex);
 951                                 goto out;
 952                         }
 953                         rc = 0;
 954                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 955                 }
 956         }
 957         mutex_unlock(&crypt_stat->cs_mutex);
 958         memcpy(&lower_ia, ia, sizeof(lower_ia));
 959         if (ia->ia_valid & ATTR_FILE)
 960                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 961         if (ia->ia_valid & ATTR_SIZE) {
 962                 rc = truncate_upper(dentry, ia, &lower_ia);
 963                 if (rc < 0)
 964                         goto out;
 965         }
 966
 967         /*
 968          * mode change is for clearing setuid/setgid bits. Allow lower fs
 969          * to interpret this in its own way.
 970          */
 971         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
 972                 lower_ia.ia_valid &= ~ATTR_MODE;
 973
 974         mutex_lock(&lower_dentry->d_inode->i_mutex);
 975         rc = notify_change(lower_dentry, &lower_ia);
 976         mutex_unlock(&lower_dentry->d_inode->i_mutex);
 977 out:
 978         fsstack_copy_attr_all(inode, lower_inode);
 979         return rc;
 980 }
 981
 982 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
 983                           struct kstat *stat)
 984 {
 985         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 986         int rc = 0;
 987
 988         mount_crypt_stat = &ecryptfs_superblock_to_private(
 989                                                 dentry->d_sb)->mount_crypt_stat;
 990         generic_fillattr(dentry->d_inode, stat);
 991         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
 992                 char *target;
 993                 size_t targetsiz;
 994
 995                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
 996                 if (!rc) {
 997                         kfree(target);
 998                         stat->size = targetsiz;
 999                 }
1000         }
1001         return rc;
1002 }
1003
1004 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1005                      struct kstat *stat)
1006 {
1007         struct kstat lower_stat;
1008         int rc;
1009
1010         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1011                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1012         if (!rc) {
1013                 fsstack_copy_attr_all(dentry->d_inode,
1014                                       ecryptfs_inode_to_lower(dentry->d_inode));
1015                 generic_fillattr(dentry->d_inode, stat);
1016                 stat->blocks = lower_stat.blocks;
1017         }
1018         return rc;
1019 }
1020
1021 int
1022 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1023                   size_t size, int flags)
1024 {
1025         int rc = 0;
1026         struct dentry *lower_dentry;
1027
1028         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1029         if (!lower_dentry->d_inode->i_op->setxattr) {
1030                 rc = -EOPNOTSUPP;
1031                 goto out;
1032         }
1033
1034         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1035 out:
1036         return rc;
1037 }
1038
1039 ssize_t
1040 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1041                         void *value, size_t size)
1042 {
1043         int rc = 0;
1044
1045         if (!lower_dentry->d_inode->i_op->getxattr) {
1046                 rc = -EOPNOTSUPP;
1047                 goto out;
1048         }
1049         mutex_lock(&lower_dentry->d_inode->i_mutex);
1050         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1051                                                    size);
1052         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1053 out:
1054         return rc;
1055 }
1056
1057 static ssize_t
1058 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1059                   size_t size)
1060 {
1061         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1062                                        value, size);
1063 }
1064
1065 static ssize_t
1066 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1067 {
1068         int rc = 0;
1069         struct dentry *lower_dentry;
1070
1071         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1072         if (!lower_dentry->d_inode->i_op->listxattr) {
1073                 rc = -EOPNOTSUPP;
1074                 goto out;
1075         }
1076         mutex_lock(&lower_dentry->d_inode->i_mutex);
1077         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1078         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1079 out:
1080         return rc;
1081 }
1082
1083 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1084 {
1085         int rc = 0;
1086         struct dentry *lower_dentry;
1087
1088         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1089         if (!lower_dentry->d_inode->i_op->removexattr) {
1090                 rc = -EOPNOTSUPP;
1091                 goto out;
1092         }
1093         mutex_lock(&lower_dentry->d_inode->i_mutex);
1094         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1095         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1096 out:
1097         return rc;
1098 }
1099
1100 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1101 {
1102         if ((ecryptfs_inode_to_lower(inode)
1103              == (struct inode *)candidate_lower_inode))
1104                 return 1;
1105         else
1106                 return 0;
1107 }
1108
1109 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1110 {
1111         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1112         return 0;
1113 }
1114
1115 const struct inode_operations ecryptfs_symlink_iops = {
1116         .readlink = ecryptfs_readlink,
1117         .follow_link = ecryptfs_follow_link,
1118         .put_link = ecryptfs_put_link,
1119         .permission = ecryptfs_permission,
1120         .setattr = ecryptfs_setattr,
1121         .getattr = ecryptfs_getattr_link,
1122         .setxattr = ecryptfs_setxattr,
1123         .getxattr = ecryptfs_getxattr,
1124         .listxattr = ecryptfs_listxattr,
1125         .removexattr = ecryptfs_removexattr
1126 };
1127
1128 const struct inode_operations ecryptfs_dir_iops = {
1129         .create = ecryptfs_create,
1130         .lookup = ecryptfs_lookup,
1131         .link = ecryptfs_link,
1132         .unlink = ecryptfs_unlink,
1133         .symlink = ecryptfs_symlink,
1134         .mkdir = ecryptfs_mkdir,
1135         .rmdir = ecryptfs_rmdir,
1136         .mknod = ecryptfs_mknod,
1137         .rename = ecryptfs_rename,
1138         .permission = ecryptfs_permission,
1139         .setattr = ecryptfs_setattr,
1140         .setxattr = ecryptfs_setxattr,
1141         .getxattr = ecryptfs_getxattr,
1142         .listxattr = ecryptfs_listxattr,
1143         .removexattr = ecryptfs_removexattr
1144 };
1145
1146 const struct inode_operations ecryptfs_main_iops = {
1147         .permission = ecryptfs_permission,
1148         .setattr = ecryptfs_setattr,
1149         .getattr = ecryptfs_getattr,
1150         .setxattr = ecryptfs_setxattr,
1151         .getxattr = ecryptfs_getxattr,
1152         .listxattr = ecryptfs_listxattr,
1153         .removexattr = ecryptfs_removexattr
1154 };