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