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         inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi;
  73
  74         if (S_ISLNK(inode->i_mode))
  75                 inode->i_op = &ecryptfs_symlink_iops;
  76         else if (S_ISDIR(inode->i_mode))
  77                 inode->i_op = &ecryptfs_dir_iops;
  78         else
  79                 inode->i_op = &ecryptfs_main_iops;
  80
  81         if (S_ISDIR(inode->i_mode))
  82                 inode->i_fop = &ecryptfs_dir_fops;
  83         else if (special_file(inode->i_mode))
  84                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  85         else
  86                 inode->i_fop = &ecryptfs_main_fops;
  87
  88         return 0;
  89 }
  90
  91 static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
  92                                           struct super_block *sb)
  93 {
  94         struct inode *inode;
  95
  96         if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
  97                 return ERR_PTR(-EXDEV);
  98         if (!igrab(lower_inode))
  99                 return ERR_PTR(-ESTALE);
 100         inode = iget5_locked(sb, (unsigned long)lower_inode,
 101                              ecryptfs_inode_test, ecryptfs_inode_set,
 102                              lower_inode);
 103         if (!inode) {
 104                 iput(lower_inode);
 105                 return ERR_PTR(-EACCES);
 106         }
 107         if (!(inode->i_state & I_NEW))
 108                 iput(lower_inode);
 109
 110         return inode;
 111 }
 112
 113 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 114                                  struct super_block *sb)
 115 {
 116         struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
 117
 118         if (!IS_ERR(inode) && (inode->i_state & I_NEW))
 119                 unlock_new_inode(inode);
 120
 121         return inode;
 122 }
 123
 124 /**
 125  * ecryptfs_interpose
 126  * @lower_dentry: Existing dentry in the lower filesystem
 127  * @dentry: ecryptfs' dentry
 128  * @sb: ecryptfs's super_block
 129  *
 130  * Interposes upper and lower dentries.
 131  *
 132  * Returns zero on success; non-zero otherwise
 133  */
 134 static int ecryptfs_interpose(struct dentry *lower_dentry,
 135                               struct dentry *dentry, struct super_block *sb)
 136 {
 137         struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb);
 138
 139         if (IS_ERR(inode))
 140                 return PTR_ERR(inode);
 141         d_instantiate(dentry, inode);
 142
 143         return 0;
 144 }
 145
 146 /**
 147  * ecryptfs_create_underlying_file
 148  * @lower_dir_inode: inode of the parent in the lower fs of the new file
 149  * @dentry: New file's dentry
 150  * @mode: The mode of the new file
 151  *
 152  * Creates the file in the lower file system.
 153  *
 154  * Returns zero on success; non-zero on error condition
 155  */
 156 static int
 157 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
 158                                 struct dentry *dentry, int mode)
 159 {
 160         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 161         return vfs_create(lower_dir_inode, lower_dentry, mode, NULL);
 162 }
 163
 164 /**
 165  * ecryptfs_do_create
 166  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
 167  * @ecryptfs_dentry: New file's dentry in ecryptfs
 168  * @mode: The mode of the new file
 169  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 170  *
 171  * Creates the underlying file and the eCryptfs inode which will link to
 172  * it. It will also update the eCryptfs directory inode to mimic the
 173  * stat of the lower directory inode.
 174  *
 175  * Returns zero on success; non-zero on error condition
 176  */
 177 static int
 178 ecryptfs_do_create(struct inode *directory_inode,
 179                    struct dentry *ecryptfs_dentry, int mode)
 180 {
 181         int rc;
 182         struct dentry *lower_dentry;
 183         struct dentry *lower_dir_dentry;
 184
 185         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 186         lower_dir_dentry = lock_parent(lower_dentry);
 187         if (IS_ERR(lower_dir_dentry)) {
 188                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 189                                 "dentry\n");
 190                 rc = PTR_ERR(lower_dir_dentry);
 191                 goto out;
 192         }
 193         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 194                                              ecryptfs_dentry, mode);
 195         if (rc) {
 196                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 197                        "rc = [%d]\n", __func__, rc);
 198                 goto out_lock;
 199         }
 200         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 201                                 directory_inode->i_sb);
 202         if (rc) {
 203                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 204                 goto out_lock;
 205         }
 206         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 207         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 208 out_lock:
 209         unlock_dir(lower_dir_dentry);
 210 out:
 211         return rc;
 212 }
 213
 214 /**
 215  * ecryptfs_initialize_file
 216  *
 217  * Cause the file to be changed from a basic empty file to an ecryptfs
 218  * file with a header and first data page.
 219  *
 220  * Returns zero on success
 221  */
 222 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 223 {
 224         struct ecryptfs_crypt_stat *crypt_stat =
 225                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 226         int rc = 0;
 227
 228         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 229                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 230                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 231                 goto out;
 232         }
 233         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 234         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 235         if (rc) {
 236                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 237                                 "context; rc = [%d]\n", rc);
 238                 goto out;
 239         }
 240         rc = ecryptfs_get_lower_file(ecryptfs_dentry,
 241                                      ecryptfs_dentry->d_inode);
 242         if (rc) {
 243                 printk(KERN_ERR "%s: Error attempting to initialize "
 244                         "the lower file for the dentry with name "
 245                         "[%s]; rc = [%d]\n", __func__,
 246                         ecryptfs_dentry->d_name.name, rc);
 247                 goto out;
 248         }
 249         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 250         if (rc)
 251                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 252         ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 253 out:
 254         return rc;
 255 }
 256
 257 /**
 258  * ecryptfs_create
 259  * @dir: The inode of the directory in which to create the file.
 260  * @dentry: The eCryptfs dentry
 261  * @mode: The mode of the new file.
 262  * @nd: nameidata
 263  *
 264  * Creates a new file.
 265  *
 266  * Returns zero on success; non-zero on error condition
 267  */
 268 static int
 269 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 270                 int mode, struct nameidata *nd)
 271 {
 272         int rc;
 273
 274         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 275         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode);
 276         if (unlikely(rc)) {
 277                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 278                                 "lower filesystem\n");
 279                 goto out;
 280         }
 281         /* At this point, a file exists on "disk"; we need to make sure
 282          * that this on disk file is prepared to be an ecryptfs file */
 283         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 284 out:
 285         return rc;
 286 }
 287
 288 static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
 289 {
 290         struct ecryptfs_crypt_stat *crypt_stat;
 291         int rc;
 292
 293         rc = ecryptfs_get_lower_file(dentry, inode);
 294         if (rc) {
 295                 printk(KERN_ERR "%s: Error attempting to initialize "
 296                         "the lower file for the dentry with name "
 297                         "[%s]; rc = [%d]\n", __func__,
 298                         dentry->d_name.name, rc);
 299                 return rc;
 300         }
 301
 302         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 303         /* TODO: lock for crypt_stat comparison */
 304         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 305                 ecryptfs_set_default_sizes(crypt_stat);
 306
 307         rc = ecryptfs_read_and_validate_header_region(inode);
 308         ecryptfs_put_lower_file(inode);
 309         if (rc) {
 310                 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
 311                 if (!rc)
 312                         crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 313         }
 314
 315         /* Must return 0 to allow non-eCryptfs files to be looked up, too */
 316         return 0;
 317 }
 318
 319 /**
 320  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
 321  */
 322 static int ecryptfs_lookup_interpose(struct dentry *dentry,
 323                                      struct dentry *lower_dentry,
 324                                      struct inode *dir_inode)
 325 {
 326         struct inode *inode, *lower_inode = lower_dentry->d_inode;
 327         struct ecryptfs_dentry_info *dentry_info;
 328         struct vfsmount *lower_mnt;
 329         int rc = 0;
 330
 331         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
 332         fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode);
 333         BUG_ON(!lower_dentry->d_count);
 334
 335         dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
 336         ecryptfs_set_dentry_private(dentry, dentry_info);
 337         if (!dentry_info) {
 338                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 339                        "to allocate ecryptfs_dentry_info struct\n",
 340                         __func__);
 341                 dput(lower_dentry);
 342                 mntput(lower_mnt);
 343                 d_drop(dentry);
 344                 return -ENOMEM;
 345         }
 346         ecryptfs_set_dentry_lower(dentry, lower_dentry);
 347         ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
 348
 349         if (!lower_dentry->d_inode) {
 350                 /* We want to add because we couldn't find in lower */
 351                 d_add(dentry, NULL);
 352                 return 0;
 353         }
 354         inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
 355         if (IS_ERR(inode)) {
 356                 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
 357                        __func__, PTR_ERR(inode));
 358                 return PTR_ERR(inode);
 359         }
 360         if (S_ISREG(inode->i_mode)) {
 361                 rc = ecryptfs_i_size_read(dentry, inode);
 362                 if (rc) {
 363                         make_bad_inode(inode);
 364                         return rc;
 365                 }
 366         }
 367
 368         if (inode->i_state & I_NEW)
 369                 unlock_new_inode(inode);
 370         d_add(dentry, inode);
 371
 372         return rc;
 373 }
 374
 375 /**
 376  * ecryptfs_lookup
 377  * @ecryptfs_dir_inode: The eCryptfs directory inode
 378  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 379  * @ecryptfs_nd: nameidata; may be NULL
 380  *
 381  * Find a file on disk. If the file does not exist, then we'll add it to the
 382  * dentry cache and continue on to read it from the disk.
 383  */
 384 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 385                                       struct dentry *ecryptfs_dentry,
 386                                       struct nameidata *ecryptfs_nd)
 387 {
 388         char *encrypted_and_encoded_name = NULL;
 389         size_t encrypted_and_encoded_name_size;
 390         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 391         struct dentry *lower_dir_dentry, *lower_dentry;
 392         int rc = 0;
 393
 394         if ((ecryptfs_dentry->d_name.len == 1
 395              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 396             || (ecryptfs_dentry->d_name.len == 2
 397                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 398                 goto out_d_drop;
 399         }
 400         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 401         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 402         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 403                                       lower_dir_dentry,
 404                                       ecryptfs_dentry->d_name.len);
 405         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 406         if (IS_ERR(lower_dentry)) {
 407                 rc = PTR_ERR(lower_dentry);
 408                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 409                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 410                                 encrypted_and_encoded_name);
 411                 goto out_d_drop;
 412         }
 413         if (lower_dentry->d_inode)
 414                 goto interpose;
 415         mount_crypt_stat = &ecryptfs_superblock_to_private(
 416                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 417         if (!(mount_crypt_stat
 418             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 419                 goto interpose;
 420         dput(lower_dentry);
 421         rc = ecryptfs_encrypt_and_encode_filename(
 422                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 423                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 424                 ecryptfs_dentry->d_name.len);
 425         if (rc) {
 426                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 427                        "filename; rc = [%d]\n", __func__, rc);
 428                 goto out_d_drop;
 429         }
 430         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 431         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 432                                       lower_dir_dentry,
 433                                       encrypted_and_encoded_name_size);
 434         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 435         if (IS_ERR(lower_dentry)) {
 436                 rc = PTR_ERR(lower_dentry);
 437                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 438                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 439                                 encrypted_and_encoded_name);
 440                 goto out_d_drop;
 441         }
 442 interpose:
 443         rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
 444                                        ecryptfs_dir_inode);
 445         goto out;
 446 out_d_drop:
 447         d_drop(ecryptfs_dentry);
 448 out:
 449         kfree(encrypted_and_encoded_name);
 450         return ERR_PTR(rc);
 451 }
 452
 453 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 454                          struct dentry *new_dentry)
 455 {
 456         struct dentry *lower_old_dentry;
 457         struct dentry *lower_new_dentry;
 458         struct dentry *lower_dir_dentry;
 459         u64 file_size_save;
 460         int rc;
 461
 462         file_size_save = i_size_read(old_dentry->d_inode);
 463         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 464         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 465         dget(lower_old_dentry);
 466         dget(lower_new_dentry);
 467         lower_dir_dentry = lock_parent(lower_new_dentry);
 468         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 469                       lower_new_dentry);
 470         if (rc || !lower_new_dentry->d_inode)
 471                 goto out_lock;
 472         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
 473         if (rc)
 474                 goto out_lock;
 475         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 476         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 477         set_nlink(old_dentry->d_inode,
 478                   ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink);
 479         i_size_write(new_dentry->d_inode, file_size_save);
 480 out_lock:
 481         unlock_dir(lower_dir_dentry);
 482         dput(lower_new_dentry);
 483         dput(lower_old_dentry);
 484         return rc;
 485 }
 486
 487 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 488 {
 489         int rc = 0;
 490         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 491         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 492         struct dentry *lower_dir_dentry;
 493
 494         dget(lower_dentry);
 495         lower_dir_dentry = lock_parent(lower_dentry);
 496         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 497         if (rc) {
 498                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 499                 goto out_unlock;
 500         }
 501         fsstack_copy_attr_times(dir, lower_dir_inode);
 502         set_nlink(dentry->d_inode,
 503                   ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink);
 504         dentry->d_inode->i_ctime = dir->i_ctime;
 505         d_drop(dentry);
 506 out_unlock:
 507         unlock_dir(lower_dir_dentry);
 508         dput(lower_dentry);
 509         return rc;
 510 }
 511
 512 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 513                             const char *symname)
 514 {
 515         int rc;
 516         struct dentry *lower_dentry;
 517         struct dentry *lower_dir_dentry;
 518         char *encoded_symname;
 519         size_t encoded_symlen;
 520         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 521
 522         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 523         dget(lower_dentry);
 524         lower_dir_dentry = lock_parent(lower_dentry);
 525         mount_crypt_stat = &ecryptfs_superblock_to_private(
 526                 dir->i_sb)->mount_crypt_stat;
 527         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 528                                                   &encoded_symlen,
 529                                                   NULL,
 530                                                   mount_crypt_stat, symname,
 531                                                   strlen(symname));
 532         if (rc)
 533                 goto out_lock;
 534         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 535                          encoded_symname);
 536         kfree(encoded_symname);
 537         if (rc || !lower_dentry->d_inode)
 538                 goto out_lock;
 539         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 540         if (rc)
 541                 goto out_lock;
 542         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 543         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 544 out_lock:
 545         unlock_dir(lower_dir_dentry);
 546         dput(lower_dentry);
 547         if (!dentry->d_inode)
 548                 d_drop(dentry);
 549         return rc;
 550 }
 551
 552 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 553 {
 554         int rc;
 555         struct dentry *lower_dentry;
 556         struct dentry *lower_dir_dentry;
 557
 558         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 559         lower_dir_dentry = lock_parent(lower_dentry);
 560         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 561         if (rc || !lower_dentry->d_inode)
 562                 goto out;
 563         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 564         if (rc)
 565                 goto out;
 566         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 567         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 568         set_nlink(dir, lower_dir_dentry->d_inode->i_nlink);
 569 out:
 570         unlock_dir(lower_dir_dentry);
 571         if (!dentry->d_inode)
 572                 d_drop(dentry);
 573         return rc;
 574 }
 575
 576 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 577 {
 578         struct dentry *lower_dentry;
 579         struct dentry *lower_dir_dentry;
 580         int rc;
 581
 582         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 583         dget(dentry);
 584         lower_dir_dentry = lock_parent(lower_dentry);
 585         dget(lower_dentry);
 586         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 587         dput(lower_dentry);
 588         if (!rc && dentry->d_inode)
 589                 clear_nlink(dentry->d_inode);
 590         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 591         set_nlink(dir, lower_dir_dentry->d_inode->i_nlink);
 592         unlock_dir(lower_dir_dentry);
 593         if (!rc)
 594                 d_drop(dentry);
 595         dput(dentry);
 596         return rc;
 597 }
 598
 599 static int
 600 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 601 {
 602         int rc;
 603         struct dentry *lower_dentry;
 604         struct dentry *lower_dir_dentry;
 605
 606         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 607         lower_dir_dentry = lock_parent(lower_dentry);
 608         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 609         if (rc || !lower_dentry->d_inode)
 610                 goto out;
 611         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 612         if (rc)
 613                 goto out;
 614         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 615         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 616 out:
 617         unlock_dir(lower_dir_dentry);
 618         if (!dentry->d_inode)
 619                 d_drop(dentry);
 620         return rc;
 621 }
 622
 623 static int
 624 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 625                 struct inode *new_dir, struct dentry *new_dentry)
 626 {
 627         int rc;
 628         struct dentry *lower_old_dentry;
 629         struct dentry *lower_new_dentry;
 630         struct dentry *lower_old_dir_dentry;
 631         struct dentry *lower_new_dir_dentry;
 632         struct dentry *trap = NULL;
 633
 634         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 635         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 636         dget(lower_old_dentry);
 637         dget(lower_new_dentry);
 638         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 639         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 640         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 641         /* source should not be ancestor of target */
 642         if (trap == lower_old_dentry) {
 643                 rc = -EINVAL;
 644                 goto out_lock;
 645         }
 646         /* target should not be ancestor of source */
 647         if (trap == lower_new_dentry) {
 648                 rc = -ENOTEMPTY;
 649                 goto out_lock;
 650         }
 651         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 652                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 653         if (rc)
 654                 goto out_lock;
 655         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 656         if (new_dir != old_dir)
 657                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 658 out_lock:
 659         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 660         dput(lower_new_dir_dentry);
 661         dput(lower_old_dir_dentry);
 662         dput(lower_new_dentry);
 663         dput(lower_old_dentry);
 664         return rc;
 665 }
 666
 667 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 668                                    size_t *bufsiz)
 669 {
 670         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 671         char *lower_buf;
 672         size_t lower_bufsiz = PATH_MAX;
 673         mm_segment_t old_fs;
 674         int rc;
 675
 676         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 677         if (!lower_buf) {
 678                 rc = -ENOMEM;
 679                 goto out;
 680         }
 681         old_fs = get_fs();
 682         set_fs(get_ds());
 683         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 684                                                    (char __user *)lower_buf,
 685                                                    lower_bufsiz);
 686         set_fs(old_fs);
 687         if (rc < 0)
 688                 goto out;
 689         lower_bufsiz = rc;
 690         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 691                                                   lower_buf, lower_bufsiz);
 692 out:
 693         kfree(lower_buf);
 694         return rc;
 695 }
 696
 697 static int
 698 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 699 {
 700         char *kbuf;
 701         size_t kbufsiz, copied;
 702         int rc;
 703
 704         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 705         if (rc)
 706                 goto out;
 707         copied = min_t(size_t, bufsiz, kbufsiz);
 708         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 709         kfree(kbuf);
 710         fsstack_copy_attr_atime(dentry->d_inode,
 711                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 712 out:
 713         return rc;
 714 }
 715
 716 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 717 {
 718         char *buf;
 719         int len = PAGE_SIZE, rc;
 720         mm_segment_t old_fs;
 721
 722         /* Released in ecryptfs_put_link(); only release here on error */
 723         buf = kmalloc(len, GFP_KERNEL);
 724         if (!buf) {
 725                 buf = ERR_PTR(-ENOMEM);
 726                 goto out;
 727         }
 728         old_fs = get_fs();
 729         set_fs(get_ds());
 730         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 731         set_fs(old_fs);
 732         if (rc < 0) {
 733                 kfree(buf);
 734                 buf = ERR_PTR(rc);
 735         } else
 736                 buf[rc] = '\0';
 737 out:
 738         nd_set_link(nd, buf);
 739         return NULL;
 740 }
 741
 742 static void
 743 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 744 {
 745         char *buf = nd_get_link(nd);
 746         if (!IS_ERR(buf)) {
 747                 /* Free the char* */
 748                 kfree(buf);
 749         }
 750 }
 751
 752 /**
 753  * upper_size_to_lower_size
 754  * @crypt_stat: Crypt_stat associated with file
 755  * @upper_size: Size of the upper file
 756  *
 757  * Calculate the required size of the lower file based on the
 758  * specified size of the upper file. This calculation is based on the
 759  * number of headers in the underlying file and the extent size.
 760  *
 761  * Returns Calculated size of the lower file.
 762  */
 763 static loff_t
 764 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 765                          loff_t upper_size)
 766 {
 767         loff_t lower_size;
 768
 769         lower_size = ecryptfs_lower_header_size(crypt_stat);
 770         if (upper_size != 0) {
 771                 loff_t num_extents;
 772
 773                 num_extents = upper_size >> crypt_stat->extent_shift;
 774                 if (upper_size & ~crypt_stat->extent_mask)
 775                         num_extents++;
 776                 lower_size += (num_extents * crypt_stat->extent_size);
 777         }
 778         return lower_size;
 779 }
 780
 781 /**
 782  * truncate_upper
 783  * @dentry: The ecryptfs layer dentry
 784  * @ia: Address of the ecryptfs inode's attributes
 785  * @lower_ia: Address of the lower inode's attributes
 786  *
 787  * Function to handle truncations modifying the size of the file. Note
 788  * that the file sizes are interpolated. When expanding, we are simply
 789  * writing strings of 0's out. When truncating, we truncate the upper
 790  * inode and update the lower_ia according to the page index
 791  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 792  * the caller must use lower_ia in a call to notify_change() to perform
 793  * the truncation of the lower inode.
 794  *
 795  * Returns zero on success; non-zero otherwise
 796  */
 797 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 798                           struct iattr *lower_ia)
 799 {
 800         int rc = 0;
 801         struct inode *inode = dentry->d_inode;
 802         struct ecryptfs_crypt_stat *crypt_stat;
 803         loff_t i_size = i_size_read(inode);
 804         loff_t lower_size_before_truncate;
 805         loff_t lower_size_after_truncate;
 806
 807         if (unlikely((ia->ia_size == i_size))) {
 808                 lower_ia->ia_valid &= ~ATTR_SIZE;
 809                 return 0;
 810         }
 811         rc = ecryptfs_get_lower_file(dentry, inode);
 812         if (rc)
 813                 return rc;
 814         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 815         /* Switch on growing or shrinking file */
 816         if (ia->ia_size > i_size) {
 817                 char zero[] = { 0x00 };
 818
 819                 lower_ia->ia_valid &= ~ATTR_SIZE;
 820                 /* Write a single 0 at the last position of the file;
 821                  * this triggers code that will fill in 0's throughout
 822                  * the intermediate portion of the previous end of the
 823                  * file and the new and of the file */
 824                 rc = ecryptfs_write(inode, zero,
 825                                     (ia->ia_size - 1), 1);
 826         } else { /* ia->ia_size < i_size_read(inode) */
 827                 /* We're chopping off all the pages down to the page
 828                  * in which ia->ia_size is located. Fill in the end of
 829                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 830                  * PAGE_CACHE_SIZE with zeros. */
 831                 size_t num_zeros = (PAGE_CACHE_SIZE
 832                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 833
 834
 835                 /*
 836                  * XXX(truncate) this should really happen at the begginning
 837                  * of ->setattr.  But the code is too messy to that as part
 838                  * of a larger patch.  ecryptfs is also totally missing out
 839                  * on the inode_change_ok check at the beginning of
 840                  * ->setattr while would include this.
 841                  */
 842                 rc = inode_newsize_ok(inode, ia->ia_size);
 843                 if (rc)
 844                         goto out;
 845
 846                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 847                         truncate_setsize(inode, ia->ia_size);
 848                         lower_ia->ia_size = ia->ia_size;
 849                         lower_ia->ia_valid |= ATTR_SIZE;
 850                         goto out;
 851                 }
 852                 if (num_zeros) {
 853                         char *zeros_virt;
 854
 855                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 856                         if (!zeros_virt) {
 857                                 rc = -ENOMEM;
 858                                 goto out;
 859                         }
 860                         rc = ecryptfs_write(inode, zeros_virt,
 861                                             ia->ia_size, num_zeros);
 862                         kfree(zeros_virt);
 863                         if (rc) {
 864                                 printk(KERN_ERR "Error attempting to zero out "
 865                                        "the remainder of the end page on "
 866                                        "reducing truncate; rc = [%d]\n", rc);
 867                                 goto out;
 868                         }
 869                 }
 870                 truncate_setsize(inode, ia->ia_size);
 871                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 872                 if (rc) {
 873                         printk(KERN_ERR "Problem with "
 874                                "ecryptfs_write_inode_size_to_metadata; "
 875                                "rc = [%d]\n", rc);
 876                         goto out;
 877                 }
 878                 /* We are reducing the size of the ecryptfs file, and need to
 879                  * know if we need to reduce the size of the lower file. */
 880                 lower_size_before_truncate =
 881                     upper_size_to_lower_size(crypt_stat, i_size);
 882                 lower_size_after_truncate =
 883                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 884                 if (lower_size_after_truncate < lower_size_before_truncate) {
 885                         lower_ia->ia_size = lower_size_after_truncate;
 886                         lower_ia->ia_valid |= ATTR_SIZE;
 887                 } else
 888                         lower_ia->ia_valid &= ~ATTR_SIZE;
 889         }
 890 out:
 891         ecryptfs_put_lower_file(inode);
 892         return rc;
 893 }
 894
 895 /**
 896  * ecryptfs_truncate
 897  * @dentry: The ecryptfs layer dentry
 898  * @new_length: The length to expand the file to
 899  *
 900  * Simple function that handles the truncation of an eCryptfs inode and
 901  * its corresponding lower inode.
 902  *
 903  * Returns zero on success; non-zero otherwise
 904  */
 905 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 906 {
 907         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 908         struct iattr lower_ia = { .ia_valid = 0 };
 909         int rc;
 910
 911         rc = truncate_upper(dentry, &ia, &lower_ia);
 912         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 913                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 914
 915                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 916                 rc = notify_change(lower_dentry, &lower_ia);
 917                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 918         }
 919         return rc;
 920 }
 921
 922 static int
 923 ecryptfs_permission(struct inode *inode, int mask)
 924 {
 925         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 926 }
 927
 928 /**
 929  * ecryptfs_setattr
 930  * @dentry: dentry handle to the inode to modify
 931  * @ia: Structure with flags of what to change and values
 932  *
 933  * Updates the metadata of an inode. If the update is to the size
 934  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 935  * of both the ecryptfs inode and the lower inode.
 936  *
 937  * All other metadata changes will be passed right to the lower filesystem,
 938  * and we will just update our inode to look like the lower.
 939  */
 940 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 941 {
 942         int rc = 0;
 943         struct dentry *lower_dentry;
 944         struct iattr lower_ia;
 945         struct inode *inode;
 946         struct inode *lower_inode;
 947         struct ecryptfs_crypt_stat *crypt_stat;
 948
 949         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 950         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 951                 ecryptfs_init_crypt_stat(crypt_stat);
 952         inode = dentry->d_inode;
 953         lower_inode = ecryptfs_inode_to_lower(inode);
 954         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 955         mutex_lock(&crypt_stat->cs_mutex);
 956         if (S_ISDIR(dentry->d_inode->i_mode))
 957                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 958         else if (S_ISREG(dentry->d_inode->i_mode)
 959                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 960                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 961                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 962
 963                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 964                         dentry->d_sb)->mount_crypt_stat;
 965                 rc = ecryptfs_get_lower_file(dentry, inode);
 966                 if (rc) {
 967                         mutex_unlock(&crypt_stat->cs_mutex);
 968                         goto out;
 969                 }
 970                 rc = ecryptfs_read_metadata(dentry);
 971                 ecryptfs_put_lower_file(inode);
 972                 if (rc) {
 973                         if (!(mount_crypt_stat->flags
 974                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 975                                 rc = -EIO;
 976                                 printk(KERN_WARNING "Either the lower file "
 977                                        "is not in a valid eCryptfs format, "
 978                                        "or the key could not be retrieved. "
 979                                        "Plaintext passthrough mode is not "
 980                                        "enabled; returning -EIO\n");
 981                                 mutex_unlock(&crypt_stat->cs_mutex);
 982                                 goto out;
 983                         }
 984                         rc = 0;
 985                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
 986                                                | ECRYPTFS_ENCRYPTED);
 987                 }
 988         }
 989         mutex_unlock(&crypt_stat->cs_mutex);
 990         if (S_ISREG(inode->i_mode)) {
 991                 rc = filemap_write_and_wait(inode->i_mapping);
 992                 if (rc)
 993                         goto out;
 994                 fsstack_copy_attr_all(inode, lower_inode);
 995         }
 996         memcpy(&lower_ia, ia, sizeof(lower_ia));
 997         if (ia->ia_valid & ATTR_FILE)
 998                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 999         if (ia->ia_valid & ATTR_SIZE) {
1000                 rc = truncate_upper(dentry, ia, &lower_ia);
1001                 if (rc < 0)
1002                         goto out;
1003         }
1004
1005         /*
1006          * mode change is for clearing setuid/setgid bits. Allow lower fs
1007          * to interpret this in its own way.
1008          */
1009         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1010                 lower_ia.ia_valid &= ~ATTR_MODE;
1011
1012         mutex_lock(&lower_dentry->d_inode->i_mutex);
1013         rc = notify_change(lower_dentry, &lower_ia);
1014         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1015 out:
1016         fsstack_copy_attr_all(inode, lower_inode);
1017         return rc;
1018 }
1019
1020 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1021                           struct kstat *stat)
1022 {
1023         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1024         int rc = 0;
1025
1026         mount_crypt_stat = &ecryptfs_superblock_to_private(
1027                                                 dentry->d_sb)->mount_crypt_stat;
1028         generic_fillattr(dentry->d_inode, stat);
1029         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1030                 char *target;
1031                 size_t targetsiz;
1032
1033                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1034                 if (!rc) {
1035                         kfree(target);
1036                         stat->size = targetsiz;
1037                 }
1038         }
1039         return rc;
1040 }
1041
1042 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1043                      struct kstat *stat)
1044 {
1045         struct kstat lower_stat;
1046         int rc;
1047
1048         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1049                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1050         if (!rc) {
1051                 fsstack_copy_attr_all(dentry->d_inode,
1052                                       ecryptfs_inode_to_lower(dentry->d_inode));
1053                 generic_fillattr(dentry->d_inode, stat);
1054                 stat->blocks = lower_stat.blocks;
1055         }
1056         return rc;
1057 }
1058
1059 int
1060 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1061                   size_t size, int flags)
1062 {
1063         int rc = 0;
1064         struct dentry *lower_dentry;
1065
1066         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1067         if (!lower_dentry->d_inode->i_op->setxattr) {
1068                 rc = -EOPNOTSUPP;
1069                 goto out;
1070         }
1071
1072         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1073 out:
1074         return rc;
1075 }
1076
1077 ssize_t
1078 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1079                         void *value, size_t size)
1080 {
1081         int rc = 0;
1082
1083         if (!lower_dentry->d_inode->i_op->getxattr) {
1084                 rc = -EOPNOTSUPP;
1085                 goto out;
1086         }
1087         mutex_lock(&lower_dentry->d_inode->i_mutex);
1088         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1089                                                    size);
1090         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1091 out:
1092         return rc;
1093 }
1094
1095 static ssize_t
1096 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1097                   size_t size)
1098 {
1099         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1100                                        value, size);
1101 }
1102
1103 static ssize_t
1104 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1105 {
1106         int rc = 0;
1107         struct dentry *lower_dentry;
1108
1109         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1110         if (!lower_dentry->d_inode->i_op->listxattr) {
1111                 rc = -EOPNOTSUPP;
1112                 goto out;
1113         }
1114         mutex_lock(&lower_dentry->d_inode->i_mutex);
1115         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1116         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1117 out:
1118         return rc;
1119 }
1120
1121 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1122 {
1123         int rc = 0;
1124         struct dentry *lower_dentry;
1125
1126         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1127         if (!lower_dentry->d_inode->i_op->removexattr) {
1128                 rc = -EOPNOTSUPP;
1129                 goto out;
1130         }
1131         mutex_lock(&lower_dentry->d_inode->i_mutex);
1132         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1133         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1134 out:
1135         return rc;
1136 }
1137
1138 const struct inode_operations ecryptfs_symlink_iops = {
1139         .readlink = ecryptfs_readlink,
1140         .follow_link = ecryptfs_follow_link,
1141         .put_link = ecryptfs_put_link,
1142         .permission = ecryptfs_permission,
1143         .setattr = ecryptfs_setattr,
1144         .getattr = ecryptfs_getattr_link,
1145         .setxattr = ecryptfs_setxattr,
1146         .getxattr = ecryptfs_getxattr,
1147         .listxattr = ecryptfs_listxattr,
1148         .removexattr = ecryptfs_removexattr
1149 };
1150
1151 const struct inode_operations ecryptfs_dir_iops = {
1152         .create = ecryptfs_create,
1153         .lookup = ecryptfs_lookup,
1154         .link = ecryptfs_link,
1155         .unlink = ecryptfs_unlink,
1156         .symlink = ecryptfs_symlink,
1157         .mkdir = ecryptfs_mkdir,
1158         .rmdir = ecryptfs_rmdir,
1159         .mknod = ecryptfs_mknod,
1160         .rename = ecryptfs_rename,
1161         .permission = ecryptfs_permission,
1162         .setattr = ecryptfs_setattr,
1163         .setxattr = ecryptfs_setxattr,
1164         .getxattr = ecryptfs_getxattr,
1165         .listxattr = ecryptfs_listxattr,
1166         .removexattr = ecryptfs_removexattr
1167 };
1168
1169 const struct inode_operations ecryptfs_main_iops = {
1170         .permission = ecryptfs_permission,
1171         .setattr = ecryptfs_setattr,
1172         .getattr = ecryptfs_getattr,
1173         .setxattr = ecryptfs_setxattr,
1174         .getxattr = ecryptfs_getxattr,
1175         .listxattr = ecryptfs_listxattr,
1176         .removexattr = ecryptfs_removexattr
1177 };