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