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