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 static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
  55 {
  56         if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode)
  57                 return 1;
  58         return 0;
  59 }
  60
  61 static int ecryptfs_inode_set(struct inode *inode, void *opaque)
  62 {
  63         struct inode *lower_inode = opaque;
  64
  65         ecryptfs_set_inode_lower(inode, lower_inode);
  66         fsstack_copy_attr_all(inode, lower_inode);
  67         /* i_size will be overwritten for encrypted regular files */
  68         fsstack_copy_inode_size(inode, lower_inode);
  69         inode->i_ino = lower_inode->i_ino;
  70         inode->i_version++;
  71         inode->i_mapping->a_ops = &ecryptfs_aops;
  72
  73         if (S_ISLNK(inode->i_mode))
  74                 inode->i_op = &ecryptfs_symlink_iops;
  75         else if (S_ISDIR(inode->i_mode))
  76                 inode->i_op = &ecryptfs_dir_iops;
  77         else
  78                 inode->i_op = &ecryptfs_main_iops;
  79
  80         if (S_ISDIR(inode->i_mode))
  81                 inode->i_fop = &ecryptfs_dir_fops;
  82         else if (special_file(inode->i_mode))
  83                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  84         else
  85                 inode->i_fop = &ecryptfs_main_fops;
  86
  87         return 0;
  88 }
  89
  90 static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
  91                                           struct super_block *sb)
  92 {
  93         struct inode *inode;
  94
  95         if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
  96                 return ERR_PTR(-EXDEV);
  97         if (!igrab(lower_inode))
  98                 return ERR_PTR(-ESTALE);
  99         inode = iget5_locked(sb, (unsigned long)lower_inode,
 100                              ecryptfs_inode_test, ecryptfs_inode_set,
 101                              lower_inode);
 102         if (!inode) {
 103                 iput(lower_inode);
 104                 return ERR_PTR(-EACCES);
 105         }
 106         if (!(inode->i_state & I_NEW))
 107                 iput(lower_inode);
 108
 109         return inode;
 110 }
 111
 112 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 113                                  struct super_block *sb)
 114 {
 115         struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
 116
 117         if (!IS_ERR(inode) && (inode->i_state & I_NEW))
 118                 unlock_new_inode(inode);
 119
 120         return inode;
 121 }
 122
 123 /**
 124  * ecryptfs_interpose
 125  * @lower_dentry: Existing dentry in the lower filesystem
 126  * @dentry: ecryptfs' dentry
 127  * @sb: ecryptfs's super_block
 128  *
 129  * Interposes upper and lower dentries.
 130  *
 131  * Returns zero on success; non-zero otherwise
 132  */
 133 static int ecryptfs_interpose(struct dentry *lower_dentry,
 134                               struct dentry *dentry, struct super_block *sb)
 135 {
 136         struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb);
 137
 138         if (IS_ERR(inode))
 139                 return PTR_ERR(inode);
 140         d_instantiate(dentry, inode);
 141
 142         return 0;
 143 }
 144
 145 /**
 146  * ecryptfs_create_underlying_file
 147  * @lower_dir_inode: inode of the parent in the lower fs of the new file
 148  * @dentry: New file's dentry
 149  * @mode: The mode of the new file
 150  *
 151  * Creates the file in the lower file system.
 152  *
 153  * Returns zero on success; non-zero on error condition
 154  */
 155 static int
 156 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
 157                                 struct dentry *dentry, int mode)
 158 {
 159         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 160         return vfs_create(lower_dir_inode, lower_dentry, mode, NULL);
 161 }
 162
 163 /**
 164  * ecryptfs_do_create
 165  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
 166  * @ecryptfs_dentry: New file's dentry in ecryptfs
 167  * @mode: The mode of the new file
 168  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 169  *
 170  * Creates the underlying file and the eCryptfs inode which will link to
 171  * it. It will also update the eCryptfs directory inode to mimic the
 172  * stat of the lower directory inode.
 173  *
 174  * Returns zero on success; non-zero on error condition
 175  */
 176 static int
 177 ecryptfs_do_create(struct inode *directory_inode,
 178                    struct dentry *ecryptfs_dentry, int mode)
 179 {
 180         int rc;
 181         struct dentry *lower_dentry;
 182         struct dentry *lower_dir_dentry;
 183
 184         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 185         lower_dir_dentry = lock_parent(lower_dentry);
 186         if (IS_ERR(lower_dir_dentry)) {
 187                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 188                                 "dentry\n");
 189                 rc = PTR_ERR(lower_dir_dentry);
 190                 goto out;
 191         }
 192         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 193                                              ecryptfs_dentry, mode);
 194         if (rc) {
 195                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 196                        "rc = [%d]\n", __func__, rc);
 197                 goto out_lock;
 198         }
 199         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 200                                 directory_inode->i_sb);
 201         if (rc) {
 202                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 203                 goto out_lock;
 204         }
 205         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 206         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 207 out_lock:
 208         unlock_dir(lower_dir_dentry);
 209 out:
 210         return rc;
 211 }
 212
 213 /**
 214  * ecryptfs_initialize_file
 215  *
 216  * Cause the file to be changed from a basic empty file to an ecryptfs
 217  * file with a header and first data page.
 218  *
 219  * Returns zero on success
 220  */
 221 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 222 {
 223         struct ecryptfs_crypt_stat *crypt_stat =
 224                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 225         int rc = 0;
 226
 227         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 228                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 229                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 230                 goto out;
 231         }
 232         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 233         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 234         if (rc) {
 235                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 236                                 "context; rc = [%d]\n", rc);
 237                 goto out;
 238         }
 239         rc = ecryptfs_get_lower_file(ecryptfs_dentry,
 240                                      ecryptfs_dentry->d_inode);
 241         if (rc) {
 242                 printk(KERN_ERR "%s: Error attempting to initialize "
 243                         "the lower file for the dentry with name "
 244                         "[%s]; rc = [%d]\n", __func__,
 245                         ecryptfs_dentry->d_name.name, rc);
 246                 goto out;
 247         }
 248         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 249         if (rc)
 250                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 251         ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 252 out:
 253         return rc;
 254 }
 255
 256 /**
 257  * ecryptfs_create
 258  * @dir: The inode of the directory in which to create the file.
 259  * @dentry: The eCryptfs dentry
 260  * @mode: The mode of the new file.
 261  * @nd: nameidata
 262  *
 263  * Creates a new file.
 264  *
 265  * Returns zero on success; non-zero on error condition
 266  */
 267 static int
 268 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 269                 int mode, struct nameidata *nd)
 270 {
 271         int rc;
 272
 273         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 274         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode);
 275         if (unlikely(rc)) {
 276                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 277                                 "lower filesystem\n");
 278                 goto out;
 279         }
 280         /* At this point, a file exists on "disk"; we need to make sure
 281          * that this on disk file is prepared to be an ecryptfs file */
 282         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 283 out:
 284         return rc;
 285 }
 286
 287 static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
 288 {
 289         struct ecryptfs_crypt_stat *crypt_stat;
 290         int rc;
 291
 292         rc = ecryptfs_get_lower_file(dentry, inode);
 293         if (rc) {
 294                 printk(KERN_ERR "%s: Error attempting to initialize "
 295                         "the lower file for the dentry with name "
 296                         "[%s]; rc = [%d]\n", __func__,
 297                         dentry->d_name.name, rc);
 298                 return rc;
 299         }
 300
 301         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 302         /* TODO: lock for crypt_stat comparison */
 303         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 304                 ecryptfs_set_default_sizes(crypt_stat);
 305
 306         rc = ecryptfs_read_and_validate_header_region(inode);
 307         ecryptfs_put_lower_file(inode);
 308         if (rc) {
 309                 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
 310                 if (!rc)
 311                         crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 312         }
 313
 314         /* Must return 0 to allow non-eCryptfs files to be looked up, too */
 315         return 0;
 316 }
 317
 318 /**
 319  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
 320  */
 321 static int ecryptfs_lookup_interpose(struct dentry *dentry,
 322                                      struct dentry *lower_dentry,
 323                                      struct inode *dir_inode)
 324 {
 325         struct inode *inode, *lower_inode = lower_dentry->d_inode;
 326         struct ecryptfs_dentry_info *dentry_info;
 327         struct vfsmount *lower_mnt;
 328         int rc = 0;
 329
 330         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
 331         fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode);
 332         BUG_ON(!lower_dentry->d_count);
 333
 334         dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
 335         ecryptfs_set_dentry_private(dentry, dentry_info);
 336         if (!dentry_info) {
 337                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 338                        "to allocate ecryptfs_dentry_info struct\n",
 339                         __func__);
 340                 dput(lower_dentry);
 341                 mntput(lower_mnt);
 342                 d_drop(dentry);
 343                 return -ENOMEM;
 344         }
 345         ecryptfs_set_dentry_lower(dentry, lower_dentry);
 346         ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
 347
 348         if (!lower_dentry->d_inode) {
 349                 /* We want to add because we couldn't find in lower */
 350                 d_add(dentry, NULL);
 351                 return 0;
 352         }
 353         inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
 354         if (IS_ERR(inode)) {
 355                 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
 356                        __func__, PTR_ERR(inode));
 357                 return PTR_ERR(inode);
 358         }
 359         if (S_ISREG(inode->i_mode)) {
 360                 rc = ecryptfs_i_size_read(dentry, inode);
 361                 if (rc) {
 362                         make_bad_inode(inode);
 363                         return rc;
 364                 }
 365         }
 366
 367         if (inode->i_state & I_NEW)
 368                 unlock_new_inode(inode);
 369         d_add(dentry, inode);
 370
 371         return rc;
 372 }
 373
 374 /**
 375  * ecryptfs_lookup
 376  * @ecryptfs_dir_inode: The eCryptfs directory inode
 377  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 378  * @ecryptfs_nd: nameidata; may be NULL
 379  *
 380  * Find a file on disk. If the file does not exist, then we'll add it to the
 381  * dentry cache and continue on to read it from the disk.
 382  */
 383 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 384                                       struct dentry *ecryptfs_dentry,
 385                                       struct nameidata *ecryptfs_nd)
 386 {
 387         char *encrypted_and_encoded_name = NULL;
 388         size_t encrypted_and_encoded_name_size;
 389         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 390         struct dentry *lower_dir_dentry, *lower_dentry;
 391         int rc = 0;
 392
 393         if ((ecryptfs_dentry->d_name.len == 1
 394              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 395             || (ecryptfs_dentry->d_name.len == 2
 396                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 397                 goto out_d_drop;
 398         }
 399         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 400         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 401         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 402                                       lower_dir_dentry,
 403                                       ecryptfs_dentry->d_name.len);
 404         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 405         if (IS_ERR(lower_dentry)) {
 406                 rc = PTR_ERR(lower_dentry);
 407                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 408                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 409                                 encrypted_and_encoded_name);
 410                 goto out_d_drop;
 411         }
 412         if (lower_dentry->d_inode)
 413                 goto interpose;
 414         mount_crypt_stat = &ecryptfs_superblock_to_private(
 415                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 416         if (!(mount_crypt_stat
 417             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 418                 goto interpose;
 419         dput(lower_dentry);
 420         rc = ecryptfs_encrypt_and_encode_filename(
 421                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 422                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 423                 ecryptfs_dentry->d_name.len);
 424         if (rc) {
 425                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 426                        "filename; rc = [%d]\n", __func__, rc);
 427                 goto out_d_drop;
 428         }
 429         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 430         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 431                                       lower_dir_dentry,
 432                                       encrypted_and_encoded_name_size);
 433         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 434         if (IS_ERR(lower_dentry)) {
 435                 rc = PTR_ERR(lower_dentry);
 436                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 437                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 438                                 encrypted_and_encoded_name);
 439                 goto out_d_drop;
 440         }
 441 interpose:
 442         rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
 443                                        ecryptfs_dir_inode);
 444         goto out;
 445 out_d_drop:
 446         d_drop(ecryptfs_dentry);
 447 out:
 448         kfree(encrypted_and_encoded_name);
 449         return ERR_PTR(rc);
 450 }
 451
 452 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 453                          struct dentry *new_dentry)
 454 {
 455         struct dentry *lower_old_dentry;
 456         struct dentry *lower_new_dentry;
 457         struct dentry *lower_dir_dentry;
 458         u64 file_size_save;
 459         int rc;
 460
 461         file_size_save = i_size_read(old_dentry->d_inode);
 462         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 463         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 464         dget(lower_old_dentry);
 465         dget(lower_new_dentry);
 466         lower_dir_dentry = lock_parent(lower_new_dentry);
 467         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 468                       lower_new_dentry);
 469         if (rc || !lower_new_dentry->d_inode)
 470                 goto out_lock;
 471         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
 472         if (rc)
 473                 goto out_lock;
 474         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 475         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 476         old_dentry->d_inode->i_nlink =
 477                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 478         i_size_write(new_dentry->d_inode, file_size_save);
 479 out_lock:
 480         unlock_dir(lower_dir_dentry);
 481         dput(lower_new_dentry);
 482         dput(lower_old_dentry);
 483         return rc;
 484 }
 485
 486 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 487 {
 488         int rc = 0;
 489         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 490         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 491         struct dentry *lower_dir_dentry;
 492
 493         dget(lower_dentry);
 494         lower_dir_dentry = lock_parent(lower_dentry);
 495         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 496         if (rc) {
 497                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 498                 goto out_unlock;
 499         }
 500         fsstack_copy_attr_times(dir, lower_dir_inode);
 501         dentry->d_inode->i_nlink =
 502                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 503         dentry->d_inode->i_ctime = dir->i_ctime;
 504         d_drop(dentry);
 505 out_unlock:
 506         unlock_dir(lower_dir_dentry);
 507         dput(lower_dentry);
 508         return rc;
 509 }
 510
 511 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 512                             const char *symname)
 513 {
 514         int rc;
 515         struct dentry *lower_dentry;
 516         struct dentry *lower_dir_dentry;
 517         char *encoded_symname;
 518         size_t encoded_symlen;
 519         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 520
 521         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 522         dget(lower_dentry);
 523         lower_dir_dentry = lock_parent(lower_dentry);
 524         mount_crypt_stat = &ecryptfs_superblock_to_private(
 525                 dir->i_sb)->mount_crypt_stat;
 526         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 527                                                   &encoded_symlen,
 528                                                   NULL,
 529                                                   mount_crypt_stat, symname,
 530                                                   strlen(symname));
 531         if (rc)
 532                 goto out_lock;
 533         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 534                          encoded_symname);
 535         kfree(encoded_symname);
 536         if (rc || !lower_dentry->d_inode)
 537                 goto out_lock;
 538         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 539         if (rc)
 540                 goto out_lock;
 541         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 542         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 543 out_lock:
 544         unlock_dir(lower_dir_dentry);
 545         dput(lower_dentry);
 546         if (!dentry->d_inode)
 547                 d_drop(dentry);
 548         return rc;
 549 }
 550
 551 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 552 {
 553         int rc;
 554         struct dentry *lower_dentry;
 555         struct dentry *lower_dir_dentry;
 556
 557         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 558         lower_dir_dentry = lock_parent(lower_dentry);
 559         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 560         if (rc || !lower_dentry->d_inode)
 561                 goto out;
 562         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 563         if (rc)
 564                 goto out;
 565         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 566         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 567         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 568 out:
 569         unlock_dir(lower_dir_dentry);
 570         if (!dentry->d_inode)
 571                 d_drop(dentry);
 572         return rc;
 573 }
 574
 575 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 576 {
 577         struct dentry *lower_dentry;
 578         struct dentry *lower_dir_dentry;
 579         int rc;
 580
 581         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 582         dget(dentry);
 583         lower_dir_dentry = lock_parent(lower_dentry);
 584         dget(lower_dentry);
 585         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 586         dput(lower_dentry);
 587         if (!rc && dentry->d_inode)
 588                 clear_nlink(dentry->d_inode);
 589         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 590         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 591         unlock_dir(lower_dir_dentry);
 592         if (!rc)
 593                 d_drop(dentry);
 594         dput(dentry);
 595         return rc;
 596 }
 597
 598 static int
 599 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 600 {
 601         int rc;
 602         struct dentry *lower_dentry;
 603         struct dentry *lower_dir_dentry;
 604
 605         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 606         lower_dir_dentry = lock_parent(lower_dentry);
 607         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 608         if (rc || !lower_dentry->d_inode)
 609                 goto out;
 610         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 611         if (rc)
 612                 goto out;
 613         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 614         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 615 out:
 616         unlock_dir(lower_dir_dentry);
 617         if (!dentry->d_inode)
 618                 d_drop(dentry);
 619         return rc;
 620 }
 621
 622 static int
 623 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 624                 struct inode *new_dir, struct dentry *new_dentry)
 625 {
 626         int rc;
 627         struct dentry *lower_old_dentry;
 628         struct dentry *lower_new_dentry;
 629         struct dentry *lower_old_dir_dentry;
 630         struct dentry *lower_new_dir_dentry;
 631         struct dentry *trap = NULL;
 632
 633         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 634         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 635         dget(lower_old_dentry);
 636         dget(lower_new_dentry);
 637         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 638         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 639         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 640         /* source should not be ancestor of target */
 641         if (trap == lower_old_dentry) {
 642                 rc = -EINVAL;
 643                 goto out_lock;
 644         }
 645         /* target should not be ancestor of source */
 646         if (trap == lower_new_dentry) {
 647                 rc = -ENOTEMPTY;
 648                 goto out_lock;
 649         }
 650         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 651                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 652         if (rc)
 653                 goto out_lock;
 654         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 655         if (new_dir != old_dir)
 656                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 657 out_lock:
 658         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 659         dput(lower_new_dir_dentry);
 660         dput(lower_old_dir_dentry);
 661         dput(lower_new_dentry);
 662         dput(lower_old_dentry);
 663         return rc;
 664 }
 665
 666 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 667                                    size_t *bufsiz)
 668 {
 669         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 670         char *lower_buf;
 671         size_t lower_bufsiz = PATH_MAX;
 672         mm_segment_t old_fs;
 673         int rc;
 674
 675         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 676         if (!lower_buf) {
 677                 rc = -ENOMEM;
 678                 goto out;
 679         }
 680         old_fs = get_fs();
 681         set_fs(get_ds());
 682         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 683                                                    (char __user *)lower_buf,
 684                                                    lower_bufsiz);
 685         set_fs(old_fs);
 686         if (rc < 0)
 687                 goto out;
 688         lower_bufsiz = rc;
 689         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 690                                                   lower_buf, lower_bufsiz);
 691 out:
 692         kfree(lower_buf);
 693         return rc;
 694 }
 695
 696 static int
 697 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 698 {
 699         char *kbuf;
 700         size_t kbufsiz, copied;
 701         int rc;
 702
 703         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 704         if (rc)
 705                 goto out;
 706         copied = min_t(size_t, bufsiz, kbufsiz);
 707         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 708         kfree(kbuf);
 709         fsstack_copy_attr_atime(dentry->d_inode,
 710                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 711 out:
 712         return rc;
 713 }
 714
 715 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 716 {
 717         char *buf;
 718         int len = PAGE_SIZE, rc;
 719         mm_segment_t old_fs;
 720
 721         /* Released in ecryptfs_put_link(); only release here on error */
 722         buf = kmalloc(len, GFP_KERNEL);
 723         if (!buf) {
 724                 buf = ERR_PTR(-ENOMEM);
 725                 goto out;
 726         }
 727         old_fs = get_fs();
 728         set_fs(get_ds());
 729         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 730         set_fs(old_fs);
 731         if (rc < 0) {
 732                 kfree(buf);
 733                 buf = ERR_PTR(rc);
 734         } else
 735                 buf[rc] = '\0';
 736 out:
 737         nd_set_link(nd, buf);
 738         return NULL;
 739 }
 740
 741 static void
 742 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 743 {
 744         char *buf = nd_get_link(nd);
 745         if (!IS_ERR(buf)) {
 746                 /* Free the char* */
 747                 kfree(buf);
 748         }
 749 }
 750
 751 /**
 752  * upper_size_to_lower_size
 753  * @crypt_stat: Crypt_stat associated with file
 754  * @upper_size: Size of the upper file
 755  *
 756  * Calculate the required size of the lower file based on the
 757  * specified size of the upper file. This calculation is based on the
 758  * number of headers in the underlying file and the extent size.
 759  *
 760  * Returns Calculated size of the lower file.
 761  */
 762 static loff_t
 763 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 764                          loff_t upper_size)
 765 {
 766         loff_t lower_size;
 767
 768         lower_size = ecryptfs_lower_header_size(crypt_stat);
 769         if (upper_size != 0) {
 770                 loff_t num_extents;
 771
 772                 num_extents = upper_size >> crypt_stat->extent_shift;
 773                 if (upper_size & ~crypt_stat->extent_mask)
 774                         num_extents++;
 775                 lower_size += (num_extents * crypt_stat->extent_size);
 776         }
 777         return lower_size;
 778 }
 779
 780 /**
 781  * truncate_upper
 782  * @dentry: The ecryptfs layer dentry
 783  * @ia: Address of the ecryptfs inode's attributes
 784  * @lower_ia: Address of the lower inode's attributes
 785  *
 786  * Function to handle truncations modifying the size of the file. Note
 787  * that the file sizes are interpolated. When expanding, we are simply
 788  * writing strings of 0's out. When truncating, we truncate the upper
 789  * inode and update the lower_ia according to the page index
 790  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 791  * the caller must use lower_ia in a call to notify_change() to perform
 792  * the truncation of the lower inode.
 793  *
 794  * Returns zero on success; non-zero otherwise
 795  */
 796 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 797                           struct iattr *lower_ia)
 798 {
 799         int rc = 0;
 800         struct inode *inode = dentry->d_inode;
 801         struct ecryptfs_crypt_stat *crypt_stat;
 802         loff_t i_size = i_size_read(inode);
 803         loff_t lower_size_before_truncate;
 804         loff_t lower_size_after_truncate;
 805
 806         if (unlikely((ia->ia_size == i_size))) {
 807                 lower_ia->ia_valid &= ~ATTR_SIZE;
 808                 return 0;
 809         }
 810         rc = ecryptfs_get_lower_file(dentry, inode);
 811         if (rc)
 812                 return rc;
 813         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 814         /* Switch on growing or shrinking file */
 815         if (ia->ia_size > i_size) {
 816                 char zero[] = { 0x00 };
 817
 818                 lower_ia->ia_valid &= ~ATTR_SIZE;
 819                 /* Write a single 0 at the last position of the file;
 820                  * this triggers code that will fill in 0's throughout
 821                  * the intermediate portion of the previous end of the
 822                  * file and the new and of the file */
 823                 rc = ecryptfs_write(inode, zero,
 824                                     (ia->ia_size - 1), 1);
 825         } else { /* ia->ia_size < i_size_read(inode) */
 826                 /* We're chopping off all the pages down to the page
 827                  * in which ia->ia_size is located. Fill in the end of
 828                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 829                  * PAGE_CACHE_SIZE with zeros. */
 830                 size_t num_zeros = (PAGE_CACHE_SIZE
 831                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 832
 833
 834                 /*
 835                  * XXX(truncate) this should really happen at the begginning
 836                  * of ->setattr.  But the code is too messy to that as part
 837                  * of a larger patch.  ecryptfs is also totally missing out
 838                  * on the inode_change_ok check at the beginning of
 839                  * ->setattr while would include this.
 840                  */
 841                 rc = inode_newsize_ok(inode, ia->ia_size);
 842                 if (rc)
 843                         goto out;
 844
 845                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 846                         truncate_setsize(inode, ia->ia_size);
 847                         lower_ia->ia_size = ia->ia_size;
 848                         lower_ia->ia_valid |= ATTR_SIZE;
 849                         goto out;
 850                 }
 851                 if (num_zeros) {
 852                         char *zeros_virt;
 853
 854                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 855                         if (!zeros_virt) {
 856                                 rc = -ENOMEM;
 857                                 goto out;
 858                         }
 859                         rc = ecryptfs_write(inode, zeros_virt,
 860                                             ia->ia_size, num_zeros);
 861                         kfree(zeros_virt);
 862                         if (rc) {
 863                                 printk(KERN_ERR "Error attempting to zero out "
 864                                        "the remainder of the end page on "
 865                                        "reducing truncate; rc = [%d]\n", rc);
 866                                 goto out;
 867                         }
 868                 }
 869                 truncate_setsize(inode, ia->ia_size);
 870                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 871                 if (rc) {
 872                         printk(KERN_ERR "Problem with "
 873                                "ecryptfs_write_inode_size_to_metadata; "
 874                                "rc = [%d]\n", rc);
 875                         goto out;
 876                 }
 877                 /* We are reducing the size of the ecryptfs file, and need to
 878                  * know if we need to reduce the size of the lower file. */
 879                 lower_size_before_truncate =
 880                     upper_size_to_lower_size(crypt_stat, i_size);
 881                 lower_size_after_truncate =
 882                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 883                 if (lower_size_after_truncate < lower_size_before_truncate) {
 884                         lower_ia->ia_size = lower_size_after_truncate;
 885                         lower_ia->ia_valid |= ATTR_SIZE;
 886                 } else
 887                         lower_ia->ia_valid &= ~ATTR_SIZE;
 888         }
 889 out:
 890         ecryptfs_put_lower_file(inode);
 891         return rc;
 892 }
 893
 894 /**
 895  * ecryptfs_truncate
 896  * @dentry: The ecryptfs layer dentry
 897  * @new_length: The length to expand the file to
 898  *
 899  * Simple function that handles the truncation of an eCryptfs inode and
 900  * its corresponding lower inode.
 901  *
 902  * Returns zero on success; non-zero otherwise
 903  */
 904 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 905 {
 906         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 907         struct iattr lower_ia = { .ia_valid = 0 };
 908         int rc;
 909
 910         rc = truncate_upper(dentry, &ia, &lower_ia);
 911         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 912                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 913
 914                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 915                 rc = notify_change(lower_dentry, &lower_ia);
 916                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 917         }
 918         return rc;
 919 }
 920
 921 static int
 922 ecryptfs_permission(struct inode *inode, int mask)
 923 {
 924         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 925 }
 926
 927 /**
 928  * ecryptfs_setattr
 929  * @dentry: dentry handle to the inode to modify
 930  * @ia: Structure with flags of what to change and values
 931  *
 932  * Updates the metadata of an inode. If the update is to the size
 933  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 934  * of both the ecryptfs inode and the lower inode.
 935  *
 936  * All other metadata changes will be passed right to the lower filesystem,
 937  * and we will just update our inode to look like the lower.
 938  */
 939 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 940 {
 941         int rc = 0;
 942         struct dentry *lower_dentry;
 943         struct iattr lower_ia;
 944         struct inode *inode;
 945         struct inode *lower_inode;
 946         struct ecryptfs_crypt_stat *crypt_stat;
 947
 948         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 949         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 950                 ecryptfs_init_crypt_stat(crypt_stat);
 951         inode = dentry->d_inode;
 952         lower_inode = ecryptfs_inode_to_lower(inode);
 953         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 954         mutex_lock(&crypt_stat->cs_mutex);
 955         if (S_ISDIR(dentry->d_inode->i_mode))
 956                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 957         else if (S_ISREG(dentry->d_inode->i_mode)
 958                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 959                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 960                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 961
 962                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 963                         dentry->d_sb)->mount_crypt_stat;
 964                 rc = ecryptfs_get_lower_file(dentry, inode);
 965                 if (rc) {
 966                         mutex_unlock(&crypt_stat->cs_mutex);
 967                         goto out;
 968                 }
 969                 rc = ecryptfs_read_metadata(dentry);
 970                 ecryptfs_put_lower_file(inode);
 971                 if (rc) {
 972                         if (!(mount_crypt_stat->flags
 973                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 974                                 rc = -EIO;
 975                                 printk(KERN_WARNING "Either the lower file "
 976                                        "is not in a valid eCryptfs format, "
 977                                        "or the key could not be retrieved. "
 978                                        "Plaintext passthrough mode is not "
 979                                        "enabled; returning -EIO\n");
 980                                 mutex_unlock(&crypt_stat->cs_mutex);
 981                                 goto out;
 982                         }
 983                         rc = 0;
 984                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
 985                                                | ECRYPTFS_ENCRYPTED);
 986                 }
 987         }
 988         mutex_unlock(&crypt_stat->cs_mutex);
 989         if (S_ISREG(inode->i_mode)) {
 990                 rc = filemap_write_and_wait(inode->i_mapping);
 991                 if (rc)
 992                         goto out;
 993                 fsstack_copy_attr_all(inode, lower_inode);
 994         }
 995         memcpy(&lower_ia, ia, sizeof(lower_ia));
 996         if (ia->ia_valid & ATTR_FILE)
 997                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 998         if (ia->ia_valid & ATTR_SIZE) {
 999                 rc = truncate_upper(dentry, ia, &lower_ia);
1000                 if (rc < 0)
1001                         goto out;
1002         }
1003
1004         /*
1005          * mode change is for clearing setuid/setgid bits. Allow lower fs
1006          * to interpret this in its own way.
1007          */
1008         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1009                 lower_ia.ia_valid &= ~ATTR_MODE;
1010
1011         mutex_lock(&lower_dentry->d_inode->i_mutex);
1012         rc = notify_change(lower_dentry, &lower_ia);
1013         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1014 out:
1015         fsstack_copy_attr_all(inode, lower_inode);
1016         return rc;
1017 }
1018
1019 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1020                           struct kstat *stat)
1021 {
1022         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1023         int rc = 0;
1024
1025         mount_crypt_stat = &ecryptfs_superblock_to_private(
1026                                                 dentry->d_sb)->mount_crypt_stat;
1027         generic_fillattr(dentry->d_inode, stat);
1028         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1029                 char *target;
1030                 size_t targetsiz;
1031
1032                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1033                 if (!rc) {
1034                         kfree(target);
1035                         stat->size = targetsiz;
1036                 }
1037         }
1038         return rc;
1039 }
1040
1041 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1042                      struct kstat *stat)
1043 {
1044         struct kstat lower_stat;
1045         int rc;
1046
1047         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1048                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1049         if (!rc) {
1050                 fsstack_copy_attr_all(dentry->d_inode,
1051                                       ecryptfs_inode_to_lower(dentry->d_inode));
1052                 generic_fillattr(dentry->d_inode, stat);
1053                 stat->blocks = lower_stat.blocks;
1054         }
1055         return rc;
1056 }
1057
1058 int
1059 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1060                   size_t size, int flags)
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->setxattr) {
1067                 rc = -EOPNOTSUPP;
1068                 goto out;
1069         }
1070
1071         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1072 out:
1073         return rc;
1074 }
1075
1076 ssize_t
1077 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1078                         void *value, size_t size)
1079 {
1080         int rc = 0;
1081
1082         if (!lower_dentry->d_inode->i_op->getxattr) {
1083                 rc = -EOPNOTSUPP;
1084                 goto out;
1085         }
1086         mutex_lock(&lower_dentry->d_inode->i_mutex);
1087         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1088                                                    size);
1089         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1090 out:
1091         return rc;
1092 }
1093
1094 static ssize_t
1095 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1096                   size_t size)
1097 {
1098         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1099                                        value, size);
1100 }
1101
1102 static ssize_t
1103 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1104 {
1105         int rc = 0;
1106         struct dentry *lower_dentry;
1107
1108         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1109         if (!lower_dentry->d_inode->i_op->listxattr) {
1110                 rc = -EOPNOTSUPP;
1111                 goto out;
1112         }
1113         mutex_lock(&lower_dentry->d_inode->i_mutex);
1114         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1115         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1116 out:
1117         return rc;
1118 }
1119
1120 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1121 {
1122         int rc = 0;
1123         struct dentry *lower_dentry;
1124
1125         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1126         if (!lower_dentry->d_inode->i_op->removexattr) {
1127                 rc = -EOPNOTSUPP;
1128                 goto out;
1129         }
1130         mutex_lock(&lower_dentry->d_inode->i_mutex);
1131         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1132         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1133 out:
1134         return rc;
1135 }
1136
1137 const struct inode_operations ecryptfs_symlink_iops = {
1138         .readlink = ecryptfs_readlink,
1139         .follow_link = ecryptfs_follow_link,
1140         .put_link = ecryptfs_put_link,
1141         .permission = ecryptfs_permission,
1142         .setattr = ecryptfs_setattr,
1143         .getattr = ecryptfs_getattr_link,
1144         .setxattr = ecryptfs_setxattr,
1145         .getxattr = ecryptfs_getxattr,
1146         .listxattr = ecryptfs_listxattr,
1147         .removexattr = ecryptfs_removexattr
1148 };
1149
1150 const struct inode_operations ecryptfs_dir_iops = {
1151         .create = ecryptfs_create,
1152         .lookup = ecryptfs_lookup,
1153         .link = ecryptfs_link,
1154         .unlink = ecryptfs_unlink,
1155         .symlink = ecryptfs_symlink,
1156         .mkdir = ecryptfs_mkdir,
1157         .rmdir = ecryptfs_rmdir,
1158         .mknod = ecryptfs_mknod,
1159         .rename = ecryptfs_rename,
1160         .permission = ecryptfs_permission,
1161         .setattr = ecryptfs_setattr,
1162         .setxattr = ecryptfs_setxattr,
1163         .getxattr = ecryptfs_getxattr,
1164         .listxattr = ecryptfs_listxattr,
1165         .removexattr = ecryptfs_removexattr
1166 };
1167
1168 const struct inode_operations ecryptfs_main_iops = {
1169         .permission = ecryptfs_permission,
1170         .setattr = ecryptfs_setattr,
1171         .getattr = ecryptfs_getattr,
1172         .setxattr = ecryptfs_setxattr,
1173         .getxattr = ecryptfs_getxattr,
1174         .listxattr = ecryptfs_listxattr,
1175         .removexattr = ecryptfs_removexattr
1176 };