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