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  * ecryptfs_initialize_file
 147  *
 148  * Cause the file to be changed from a basic empty file to an ecryptfs
 149  * file with a header and first data page.
 150  *
 151  * Returns zero on success
 152  */
 153 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 154 {
 155         struct ecryptfs_crypt_stat *crypt_stat =
 156                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 157         int rc = 0;
 158
 159         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 160                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 161                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 162                 goto out;
 163         }
 164         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 165         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 166         if (rc) {
 167                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 168                                 "context; rc = [%d]\n", rc);
 169                 goto out;
 170         }
 171         rc = ecryptfs_get_lower_file(ecryptfs_dentry);
 172         if (rc) {
 173                 printk(KERN_ERR "%s: Error attempting to initialize "
 174                         "the lower file for the dentry with name "
 175                         "[%s]; rc = [%d]\n", __func__,
 176                         ecryptfs_dentry->d_name.name, rc);
 177                 goto out;
 178         }
 179         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 180         if (rc)
 181                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 182         ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 183 out:
 184         return rc;
 185 }
 186
 187 /**
 188  * ecryptfs_create
 189  * @dir: The inode of the directory in which to create the file.
 190  * @dentry: The eCryptfs dentry
 191  * @mode: The mode of the new file.
 192  * @nd: nameidata
 193  *
 194  * Creates a new file.
 195  *
 196  * Returns zero on success; non-zero on error condition
 197  */
 198 static int
 199 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 200                 int mode, struct nameidata *nd)
 201 {
 202         int rc;
 203
 204         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 205         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 206         if (unlikely(rc)) {
 207                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 208                                 "lower filesystem\n");
 209                 goto out;
 210         }
 211         /* At this point, a file exists on "disk"; we need to make sure
 212          * that this on disk file is prepared to be an ecryptfs file */
 213         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 214 out:
 215         return rc;
 216 }
 217
 218 /**
 219  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
 220  */
 221 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 222                                         struct dentry *lower_dentry,
 223                                         struct inode *ecryptfs_dir_inode)
 224 {
 225         struct dentry *lower_dir_dentry;
 226         struct vfsmount *lower_mnt;
 227         struct inode *lower_inode;
 228         struct ecryptfs_crypt_stat *crypt_stat;
 229         char *page_virt = NULL;
 230         int put_lower = 0, rc = 0;
 231
 232         lower_dir_dentry = lower_dentry->d_parent;
 233         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 234                                    ecryptfs_dentry->d_parent));
 235         lower_inode = lower_dentry->d_inode;
 236         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
 237         BUG_ON(!lower_dentry->d_count);
 238         ecryptfs_set_dentry_private(ecryptfs_dentry,
 239                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
 240                                                      GFP_KERNEL));
 241         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
 242                 rc = -ENOMEM;
 243                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 244                        "to allocate ecryptfs_dentry_info struct\n",
 245                         __func__);
 246                 goto out_put;
 247         }
 248         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 249         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
 250         if (!lower_dentry->d_inode) {
 251                 /* We want to add because we couldn't find in lower */
 252                 d_add(ecryptfs_dentry, NULL);
 253                 goto out;
 254         }
 255         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 256                                 ecryptfs_dir_inode->i_sb,
 257                                 ECRYPTFS_INTERPOSE_FLAG_D_ADD);
 258         if (rc) {
 259                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
 260                        __func__, rc);
 261                 goto out;
 262         }
 263         if (S_ISDIR(lower_inode->i_mode))
 264                 goto out;
 265         if (S_ISLNK(lower_inode->i_mode))
 266                 goto out;
 267         if (special_file(lower_inode->i_mode))
 268                 goto out;
 269         /* Released in this function */
 270         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
 271         if (!page_virt) {
 272                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
 273                        __func__);
 274                 rc = -ENOMEM;
 275                 goto out;
 276         }
 277         rc = ecryptfs_get_lower_file(ecryptfs_dentry);
 278         if (rc) {
 279                 printk(KERN_ERR "%s: Error attempting to initialize "
 280                         "the lower file for the dentry with name "
 281                         "[%s]; rc = [%d]\n", __func__,
 282                         ecryptfs_dentry->d_name.name, rc);
 283                 goto out_free_kmem;
 284         }
 285         put_lower = 1;
 286         crypt_stat = &ecryptfs_inode_to_private(
 287                                         ecryptfs_dentry->d_inode)->crypt_stat;
 288         /* TODO: lock for crypt_stat comparison */
 289         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 290                         ecryptfs_set_default_sizes(crypt_stat);
 291         rc = ecryptfs_read_and_validate_header_region(page_virt,
 292                                                       ecryptfs_dentry->d_inode);
 293         if (rc) {
 294                 memset(page_virt, 0, PAGE_CACHE_SIZE);
 295                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 296                                                              ecryptfs_dentry);
 297                 if (rc) {
 298                         rc = 0;
 299                         goto out_free_kmem;
 300                 }
 301                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 302         }
 303         ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode);
 304 out_free_kmem:
 305         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 306         goto out;
 307 out_put:
 308         dput(lower_dentry);
 309         mntput(lower_mnt);
 310         d_drop(ecryptfs_dentry);
 311 out:
 312         if (put_lower)
 313                 ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 314         return rc;
 315 }
 316
 317 /**
 318  * ecryptfs_lookup
 319  * @ecryptfs_dir_inode: The eCryptfs directory inode
 320  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 321  * @ecryptfs_nd: nameidata; may be NULL
 322  *
 323  * Find a file on disk. If the file does not exist, then we'll add it to the
 324  * dentry cache and continue on to read it from the disk.
 325  */
 326 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 327                                       struct dentry *ecryptfs_dentry,
 328                                       struct nameidata *ecryptfs_nd)
 329 {
 330         char *encrypted_and_encoded_name = NULL;
 331         size_t encrypted_and_encoded_name_size;
 332         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 333         struct dentry *lower_dir_dentry, *lower_dentry;
 334         int rc = 0;
 335
 336         if ((ecryptfs_dentry->d_name.len == 1
 337              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 338             || (ecryptfs_dentry->d_name.len == 2
 339                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 340                 goto out_d_drop;
 341         }
 342         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 343         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 344         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 345                                       lower_dir_dentry,
 346                                       ecryptfs_dentry->d_name.len);
 347         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 348         if (IS_ERR(lower_dentry)) {
 349                 rc = PTR_ERR(lower_dentry);
 350                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 351                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 352                                 encrypted_and_encoded_name);
 353                 goto out_d_drop;
 354         }
 355         if (lower_dentry->d_inode)
 356                 goto lookup_and_interpose;
 357         mount_crypt_stat = &ecryptfs_superblock_to_private(
 358                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 359         if (!(mount_crypt_stat
 360             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 361                 goto lookup_and_interpose;
 362         dput(lower_dentry);
 363         rc = ecryptfs_encrypt_and_encode_filename(
 364                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 365                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 366                 ecryptfs_dentry->d_name.len);
 367         if (rc) {
 368                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 369                        "filename; rc = [%d]\n", __func__, rc);
 370                 goto out_d_drop;
 371         }
 372         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 373         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 374                                       lower_dir_dentry,
 375                                       encrypted_and_encoded_name_size);
 376         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 377         if (IS_ERR(lower_dentry)) {
 378                 rc = PTR_ERR(lower_dentry);
 379                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 380                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 381                                 encrypted_and_encoded_name);
 382                 goto out_d_drop;
 383         }
 384 lookup_and_interpose:
 385         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
 386                                                  ecryptfs_dir_inode);
 387         goto out;
 388 out_d_drop:
 389         d_drop(ecryptfs_dentry);
 390 out:
 391         kfree(encrypted_and_encoded_name);
 392         return ERR_PTR(rc);
 393 }
 394
 395 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 396                          struct dentry *new_dentry)
 397 {
 398         struct dentry *lower_old_dentry;
 399         struct dentry *lower_new_dentry;
 400         struct dentry *lower_dir_dentry;
 401         u64 file_size_save;
 402         int rc;
 403
 404         file_size_save = i_size_read(old_dentry->d_inode);
 405         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 406         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 407         dget(lower_old_dentry);
 408         dget(lower_new_dentry);
 409         lower_dir_dentry = lock_parent(lower_new_dentry);
 410         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 411                       lower_new_dentry);
 412         if (rc || !lower_new_dentry->d_inode)
 413                 goto out_lock;
 414         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
 415         if (rc)
 416                 goto out_lock;
 417         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 418         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 419         old_dentry->d_inode->i_nlink =
 420                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 421         i_size_write(new_dentry->d_inode, file_size_save);
 422 out_lock:
 423         unlock_dir(lower_dir_dentry);
 424         dput(lower_new_dentry);
 425         dput(lower_old_dentry);
 426         return rc;
 427 }
 428
 429 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 430 {
 431         int rc = 0;
 432         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 433         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 434         struct dentry *lower_dir_dentry;
 435
 436         dget(lower_dentry);
 437         lower_dir_dentry = lock_parent(lower_dentry);
 438         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 439         if (rc) {
 440                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 441                 goto out_unlock;
 442         }
 443         fsstack_copy_attr_times(dir, lower_dir_inode);
 444         dentry->d_inode->i_nlink =
 445                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 446         dentry->d_inode->i_ctime = dir->i_ctime;
 447         d_drop(dentry);
 448 out_unlock:
 449         unlock_dir(lower_dir_dentry);
 450         dput(lower_dentry);
 451         return rc;
 452 }
 453
 454 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 455                             const char *symname)
 456 {
 457         int rc;
 458         struct dentry *lower_dentry;
 459         struct dentry *lower_dir_dentry;
 460         char *encoded_symname;
 461         size_t encoded_symlen;
 462         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 463
 464         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 465         dget(lower_dentry);
 466         lower_dir_dentry = lock_parent(lower_dentry);
 467         mount_crypt_stat = &ecryptfs_superblock_to_private(
 468                 dir->i_sb)->mount_crypt_stat;
 469         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 470                                                   &encoded_symlen,
 471                                                   NULL,
 472                                                   mount_crypt_stat, symname,
 473                                                   strlen(symname));
 474         if (rc)
 475                 goto out_lock;
 476         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 477                          encoded_symname);
 478         kfree(encoded_symname);
 479         if (rc || !lower_dentry->d_inode)
 480                 goto out_lock;
 481         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 482         if (rc)
 483                 goto out_lock;
 484         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 485         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 486 out_lock:
 487         unlock_dir(lower_dir_dentry);
 488         dput(lower_dentry);
 489         if (!dentry->d_inode)
 490                 d_drop(dentry);
 491         return rc;
 492 }
 493
 494 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 495 {
 496         int rc;
 497         struct dentry *lower_dentry;
 498         struct dentry *lower_dir_dentry;
 499
 500         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 501         lower_dir_dentry = lock_parent(lower_dentry);
 502         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 503         if (rc || !lower_dentry->d_inode)
 504                 goto out;
 505         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 506         if (rc)
 507                 goto out;
 508         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 509         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 510         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 511 out:
 512         unlock_dir(lower_dir_dentry);
 513         if (!dentry->d_inode)
 514                 d_drop(dentry);
 515         return rc;
 516 }
 517
 518 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 519 {
 520         struct dentry *lower_dentry;
 521         struct dentry *lower_dir_dentry;
 522         int rc;
 523
 524         dentry_unhash(dentry);
 525
 526         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 527         dget(dentry);
 528         lower_dir_dentry = lock_parent(lower_dentry);
 529         dget(lower_dentry);
 530         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 531         dput(lower_dentry);
 532         if (!rc && dentry->d_inode)
 533                 clear_nlink(dentry->d_inode);
 534         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 535         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 536         unlock_dir(lower_dir_dentry);
 537         if (!rc)
 538                 d_drop(dentry);
 539         dput(dentry);
 540         return rc;
 541 }
 542
 543 static int
 544 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 545 {
 546         int rc;
 547         struct dentry *lower_dentry;
 548         struct dentry *lower_dir_dentry;
 549
 550         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 551         lower_dir_dentry = lock_parent(lower_dentry);
 552         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 553         if (rc || !lower_dentry->d_inode)
 554                 goto out;
 555         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 556         if (rc)
 557                 goto out;
 558         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 559         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 560 out:
 561         unlock_dir(lower_dir_dentry);
 562         if (!dentry->d_inode)
 563                 d_drop(dentry);
 564         return rc;
 565 }
 566
 567 static int
 568 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 569                 struct inode *new_dir, struct dentry *new_dentry)
 570 {
 571         int rc;
 572         struct dentry *lower_old_dentry;
 573         struct dentry *lower_new_dentry;
 574         struct dentry *lower_old_dir_dentry;
 575         struct dentry *lower_new_dir_dentry;
 576         struct dentry *trap = NULL;
 577
 578         if (new_dentry->d_inode && S_ISDIR(new_dentry->d_inode->i_mode))
 579                 dentry_unhash(new_dentry);
 580
 581         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 582         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 583         dget(lower_old_dentry);
 584         dget(lower_new_dentry);
 585         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 586         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 587         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 588         /* source should not be ancestor of target */
 589         if (trap == lower_old_dentry) {
 590                 rc = -EINVAL;
 591                 goto out_lock;
 592         }
 593         /* target should not be ancestor of source */
 594         if (trap == lower_new_dentry) {
 595                 rc = -ENOTEMPTY;
 596                 goto out_lock;
 597         }
 598         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 599                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 600         if (rc)
 601                 goto out_lock;
 602         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 603         if (new_dir != old_dir)
 604                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 605 out_lock:
 606         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 607         dput(lower_new_dir_dentry);
 608         dput(lower_old_dir_dentry);
 609         dput(lower_new_dentry);
 610         dput(lower_old_dentry);
 611         return rc;
 612 }
 613
 614 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 615                                    size_t *bufsiz)
 616 {
 617         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 618         char *lower_buf;
 619         size_t lower_bufsiz = PATH_MAX;
 620         mm_segment_t old_fs;
 621         int rc;
 622
 623         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 624         if (!lower_buf) {
 625                 rc = -ENOMEM;
 626                 goto out;
 627         }
 628         old_fs = get_fs();
 629         set_fs(get_ds());
 630         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 631                                                    (char __user *)lower_buf,
 632                                                    lower_bufsiz);
 633         set_fs(old_fs);
 634         if (rc < 0)
 635                 goto out;
 636         lower_bufsiz = rc;
 637         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 638                                                   lower_buf, lower_bufsiz);
 639 out:
 640         kfree(lower_buf);
 641         return rc;
 642 }
 643
 644 static int
 645 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 646 {
 647         char *kbuf;
 648         size_t kbufsiz, copied;
 649         int rc;
 650
 651         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 652         if (rc)
 653                 goto out;
 654         copied = min_t(size_t, bufsiz, kbufsiz);
 655         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 656         kfree(kbuf);
 657         fsstack_copy_attr_atime(dentry->d_inode,
 658                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 659 out:
 660         return rc;
 661 }
 662
 663 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 664 {
 665         char *buf;
 666         int len = PAGE_SIZE, rc;
 667         mm_segment_t old_fs;
 668
 669         /* Released in ecryptfs_put_link(); only release here on error */
 670         buf = kmalloc(len, GFP_KERNEL);
 671         if (!buf) {
 672                 buf = ERR_PTR(-ENOMEM);
 673                 goto out;
 674         }
 675         old_fs = get_fs();
 676         set_fs(get_ds());
 677         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 678         set_fs(old_fs);
 679         if (rc < 0) {
 680                 kfree(buf);
 681                 buf = ERR_PTR(rc);
 682         } else
 683                 buf[rc] = '\0';
 684 out:
 685         nd_set_link(nd, buf);
 686         return NULL;
 687 }
 688
 689 static void
 690 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 691 {
 692         char *buf = nd_get_link(nd);
 693         if (!IS_ERR(buf)) {
 694                 /* Free the char* */
 695                 kfree(buf);
 696         }
 697 }
 698
 699 /**
 700  * upper_size_to_lower_size
 701  * @crypt_stat: Crypt_stat associated with file
 702  * @upper_size: Size of the upper file
 703  *
 704  * Calculate the required size of the lower file based on the
 705  * specified size of the upper file. This calculation is based on the
 706  * number of headers in the underlying file and the extent size.
 707  *
 708  * Returns Calculated size of the lower file.
 709  */
 710 static loff_t
 711 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 712                          loff_t upper_size)
 713 {
 714         loff_t lower_size;
 715
 716         lower_size = ecryptfs_lower_header_size(crypt_stat);
 717         if (upper_size != 0) {
 718                 loff_t num_extents;
 719
 720                 num_extents = upper_size >> crypt_stat->extent_shift;
 721                 if (upper_size & ~crypt_stat->extent_mask)
 722                         num_extents++;
 723                 lower_size += (num_extents * crypt_stat->extent_size);
 724         }
 725         return lower_size;
 726 }
 727
 728 /**
 729  * truncate_upper
 730  * @dentry: The ecryptfs layer dentry
 731  * @ia: Address of the ecryptfs inode's attributes
 732  * @lower_ia: Address of the lower inode's attributes
 733  *
 734  * Function to handle truncations modifying the size of the file. Note
 735  * that the file sizes are interpolated. When expanding, we are simply
 736  * writing strings of 0's out. When truncating, we truncate the upper
 737  * inode and update the lower_ia according to the page index
 738  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 739  * the caller must use lower_ia in a call to notify_change() to perform
 740  * the truncation of the lower inode.
 741  *
 742  * Returns zero on success; non-zero otherwise
 743  */
 744 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 745                           struct iattr *lower_ia)
 746 {
 747         int rc = 0;
 748         struct inode *inode = dentry->d_inode;
 749         struct ecryptfs_crypt_stat *crypt_stat;
 750         loff_t i_size = i_size_read(inode);
 751         loff_t lower_size_before_truncate;
 752         loff_t lower_size_after_truncate;
 753
 754         if (unlikely((ia->ia_size == i_size))) {
 755                 lower_ia->ia_valid &= ~ATTR_SIZE;
 756                 return 0;
 757         }
 758         rc = ecryptfs_get_lower_file(dentry);
 759         if (rc)
 760                 return rc;
 761         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 762         /* Switch on growing or shrinking file */
 763         if (ia->ia_size > i_size) {
 764                 char zero[] = { 0x00 };
 765
 766                 lower_ia->ia_valid &= ~ATTR_SIZE;
 767                 /* Write a single 0 at the last position of the file;
 768                  * this triggers code that will fill in 0's throughout
 769                  * the intermediate portion of the previous end of the
 770                  * file and the new and of the file */
 771                 rc = ecryptfs_write(inode, zero,
 772                                     (ia->ia_size - 1), 1);
 773         } else { /* ia->ia_size < i_size_read(inode) */
 774                 /* We're chopping off all the pages down to the page
 775                  * in which ia->ia_size is located. Fill in the end of
 776                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 777                  * PAGE_CACHE_SIZE with zeros. */
 778                 size_t num_zeros = (PAGE_CACHE_SIZE
 779                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 780
 781
 782                 /*
 783                  * XXX(truncate) this should really happen at the begginning
 784                  * of ->setattr.  But the code is too messy to that as part
 785                  * of a larger patch.  ecryptfs is also totally missing out
 786                  * on the inode_change_ok check at the beginning of
 787                  * ->setattr while would include this.
 788                  */
 789                 rc = inode_newsize_ok(inode, ia->ia_size);
 790                 if (rc)
 791                         goto out;
 792
 793                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 794                         truncate_setsize(inode, ia->ia_size);
 795                         lower_ia->ia_size = ia->ia_size;
 796                         lower_ia->ia_valid |= ATTR_SIZE;
 797                         goto out;
 798                 }
 799                 if (num_zeros) {
 800                         char *zeros_virt;
 801
 802                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 803                         if (!zeros_virt) {
 804                                 rc = -ENOMEM;
 805                                 goto out;
 806                         }
 807                         rc = ecryptfs_write(inode, zeros_virt,
 808                                             ia->ia_size, num_zeros);
 809                         kfree(zeros_virt);
 810                         if (rc) {
 811                                 printk(KERN_ERR "Error attempting to zero out "
 812                                        "the remainder of the end page on "
 813                                        "reducing truncate; rc = [%d]\n", rc);
 814                                 goto out;
 815                         }
 816                 }
 817                 truncate_setsize(inode, ia->ia_size);
 818                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 819                 if (rc) {
 820                         printk(KERN_ERR "Problem with "
 821                                "ecryptfs_write_inode_size_to_metadata; "
 822                                "rc = [%d]\n", rc);
 823                         goto out;
 824                 }
 825                 /* We are reducing the size of the ecryptfs file, and need to
 826                  * know if we need to reduce the size of the lower file. */
 827                 lower_size_before_truncate =
 828                     upper_size_to_lower_size(crypt_stat, i_size);
 829                 lower_size_after_truncate =
 830                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 831                 if (lower_size_after_truncate < lower_size_before_truncate) {
 832                         lower_ia->ia_size = lower_size_after_truncate;
 833                         lower_ia->ia_valid |= ATTR_SIZE;
 834                 } else
 835                         lower_ia->ia_valid &= ~ATTR_SIZE;
 836         }
 837 out:
 838         ecryptfs_put_lower_file(inode);
 839         return rc;
 840 }
 841
 842 /**
 843  * ecryptfs_truncate
 844  * @dentry: The ecryptfs layer dentry
 845  * @new_length: The length to expand the file to
 846  *
 847  * Simple function that handles the truncation of an eCryptfs inode and
 848  * its corresponding lower inode.
 849  *
 850  * Returns zero on success; non-zero otherwise
 851  */
 852 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 853 {
 854         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 855         struct iattr lower_ia = { .ia_valid = 0 };
 856         int rc;
 857
 858         rc = truncate_upper(dentry, &ia, &lower_ia);
 859         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 860                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 861
 862                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 863                 rc = notify_change(lower_dentry, &lower_ia);
 864                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 865         }
 866         return rc;
 867 }
 868
 869 static int
 870 ecryptfs_permission(struct inode *inode, int mask, unsigned int flags)
 871 {
 872         if (flags & IPERM_FLAG_RCU)
 873                 return -ECHILD;
 874         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 875 }
 876
 877 /**
 878  * ecryptfs_setattr
 879  * @dentry: dentry handle to the inode to modify
 880  * @ia: Structure with flags of what to change and values
 881  *
 882  * Updates the metadata of an inode. If the update is to the size
 883  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 884  * of both the ecryptfs inode and the lower inode.
 885  *
 886  * All other metadata changes will be passed right to the lower filesystem,
 887  * and we will just update our inode to look like the lower.
 888  */
 889 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 890 {
 891         int rc = 0;
 892         struct dentry *lower_dentry;
 893         struct iattr lower_ia;
 894         struct inode *inode;
 895         struct inode *lower_inode;
 896         struct ecryptfs_crypt_stat *crypt_stat;
 897
 898         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 899         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 900                 ecryptfs_init_crypt_stat(crypt_stat);
 901         inode = dentry->d_inode;
 902         lower_inode = ecryptfs_inode_to_lower(inode);
 903         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 904         mutex_lock(&crypt_stat->cs_mutex);
 905         if (S_ISDIR(dentry->d_inode->i_mode))
 906                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 907         else if (S_ISREG(dentry->d_inode->i_mode)
 908                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 909                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 910                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 911
 912                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 913                         dentry->d_sb)->mount_crypt_stat;
 914                 rc = ecryptfs_get_lower_file(dentry);
 915                 if (rc) {
 916                         mutex_unlock(&crypt_stat->cs_mutex);
 917                         goto out;
 918                 }
 919                 rc = ecryptfs_read_metadata(dentry);
 920                 ecryptfs_put_lower_file(inode);
 921                 if (rc) {
 922                         if (!(mount_crypt_stat->flags
 923                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 924                                 rc = -EIO;
 925                                 printk(KERN_WARNING "Either the lower file "
 926                                        "is not in a valid eCryptfs format, "
 927                                        "or the key could not be retrieved. "
 928                                        "Plaintext passthrough mode is not "
 929                                        "enabled; returning -EIO\n");
 930                                 mutex_unlock(&crypt_stat->cs_mutex);
 931                                 goto out;
 932                         }
 933                         rc = 0;
 934                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
 935                                                | ECRYPTFS_ENCRYPTED);
 936                 }
 937         }
 938         mutex_unlock(&crypt_stat->cs_mutex);
 939         if (S_ISREG(inode->i_mode)) {
 940                 rc = filemap_write_and_wait(inode->i_mapping);
 941                 if (rc)
 942                         goto out;
 943                 fsstack_copy_attr_all(inode, lower_inode);
 944         }
 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                 fsstack_copy_attr_all(dentry->d_inode,
1001                                       ecryptfs_inode_to_lower(dentry->d_inode));
1002                 generic_fillattr(dentry->d_inode, stat);
1003                 stat->blocks = lower_stat.blocks;
1004         }
1005         return rc;
1006 }
1007
1008 int
1009 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1010                   size_t size, int flags)
1011 {
1012         int rc = 0;
1013         struct dentry *lower_dentry;
1014
1015         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1016         if (!lower_dentry->d_inode->i_op->setxattr) {
1017                 rc = -EOPNOTSUPP;
1018                 goto out;
1019         }
1020
1021         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
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 };