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, NULL);
 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  * @nd: nameidata
 244  *
 245  * Creates a new file.
 246  *
 247  * Returns zero on success; non-zero on error condition
 248  */
 249 static int
 250 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 251                 umode_t mode, struct nameidata *nd)
 252 {
 253         struct inode *ecryptfs_inode;
 254         int rc;
 255
 256         ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
 257                                             mode);
 258         if (unlikely(IS_ERR(ecryptfs_inode))) {
 259                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 260                                 "lower filesystem\n");
 261                 rc = PTR_ERR(ecryptfs_inode);
 262                 goto out;
 263         }
 264         /* At this point, a file exists on "disk"; we need to make sure
 265          * that this on disk file is prepared to be an ecryptfs file */
 266         rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
 267         if (rc) {
 268                 drop_nlink(ecryptfs_inode);
 269                 unlock_new_inode(ecryptfs_inode);
 270                 iput(ecryptfs_inode);
 271                 goto out;
 272         }
 273         d_instantiate(ecryptfs_dentry, ecryptfs_inode);
 274         unlock_new_inode(ecryptfs_inode);
 275 out:
 276         return rc;
 277 }
 278
 279 static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
 280 {
 281         struct ecryptfs_crypt_stat *crypt_stat;
 282         int rc;
 283
 284         rc = ecryptfs_get_lower_file(dentry, inode);
 285         if (rc) {
 286                 printk(KERN_ERR "%s: Error attempting to initialize "
 287                         "the lower file for the dentry with name "
 288                         "[%s]; rc = [%d]\n", __func__,
 289                         dentry->d_name.name, rc);
 290                 return rc;
 291         }
 292
 293         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 294         /* TODO: lock for crypt_stat comparison */
 295         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 296                 ecryptfs_set_default_sizes(crypt_stat);
 297
 298         rc = ecryptfs_read_and_validate_header_region(inode);
 299         ecryptfs_put_lower_file(inode);
 300         if (rc) {
 301                 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
 302                 if (!rc)
 303                         crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 304         }
 305
 306         /* Must return 0 to allow non-eCryptfs files to be looked up, too */
 307         return 0;
 308 }
 309
 310 /**
 311  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
 312  */
 313 static int ecryptfs_lookup_interpose(struct dentry *dentry,
 314                                      struct dentry *lower_dentry,
 315                                      struct inode *dir_inode)
 316 {
 317         struct inode *inode, *lower_inode = lower_dentry->d_inode;
 318         struct ecryptfs_dentry_info *dentry_info;
 319         struct vfsmount *lower_mnt;
 320         int rc = 0;
 321
 322         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
 323         fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode);
 324         BUG_ON(!lower_dentry->d_count);
 325
 326         dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
 327         ecryptfs_set_dentry_private(dentry, dentry_info);
 328         if (!dentry_info) {
 329                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 330                        "to allocate ecryptfs_dentry_info struct\n",
 331                         __func__);
 332                 dput(lower_dentry);
 333                 mntput(lower_mnt);
 334                 d_drop(dentry);
 335                 return -ENOMEM;
 336         }
 337         ecryptfs_set_dentry_lower(dentry, lower_dentry);
 338         ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
 339
 340         if (!lower_dentry->d_inode) {
 341                 /* We want to add because we couldn't find in lower */
 342                 d_add(dentry, NULL);
 343                 return 0;
 344         }
 345         inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
 346         if (IS_ERR(inode)) {
 347                 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
 348                        __func__, PTR_ERR(inode));
 349                 return PTR_ERR(inode);
 350         }
 351         if (S_ISREG(inode->i_mode)) {
 352                 rc = ecryptfs_i_size_read(dentry, inode);
 353                 if (rc) {
 354                         make_bad_inode(inode);
 355                         return rc;
 356                 }
 357         }
 358
 359         if (inode->i_state & I_NEW)
 360                 unlock_new_inode(inode);
 361         d_add(dentry, inode);
 362
 363         return rc;
 364 }
 365
 366 /**
 367  * ecryptfs_lookup
 368  * @ecryptfs_dir_inode: The eCryptfs directory inode
 369  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 370  * @ecryptfs_nd: nameidata; may be NULL
 371  *
 372  * Find a file on disk. If the file does not exist, then we'll add it to the
 373  * dentry cache and continue on to read it from the disk.
 374  */
 375 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 376                                       struct dentry *ecryptfs_dentry,
 377                                       struct nameidata *ecryptfs_nd)
 378 {
 379         char *encrypted_and_encoded_name = NULL;
 380         size_t encrypted_and_encoded_name_size;
 381         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 382         struct dentry *lower_dir_dentry, *lower_dentry;
 383         int rc = 0;
 384
 385         if ((ecryptfs_dentry->d_name.len == 1
 386              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 387             || (ecryptfs_dentry->d_name.len == 2
 388                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 389                 goto out_d_drop;
 390         }
 391         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 392         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 393         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 394                                       lower_dir_dentry,
 395                                       ecryptfs_dentry->d_name.len);
 396         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 397         if (IS_ERR(lower_dentry)) {
 398                 rc = PTR_ERR(lower_dentry);
 399                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 400                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 401                                 encrypted_and_encoded_name);
 402                 goto out_d_drop;
 403         }
 404         if (lower_dentry->d_inode)
 405                 goto interpose;
 406         mount_crypt_stat = &ecryptfs_superblock_to_private(
 407                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 408         if (!(mount_crypt_stat
 409             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 410                 goto interpose;
 411         dput(lower_dentry);
 412         rc = ecryptfs_encrypt_and_encode_filename(
 413                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 414                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 415                 ecryptfs_dentry->d_name.len);
 416         if (rc) {
 417                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 418                        "filename; rc = [%d]\n", __func__, rc);
 419                 goto out_d_drop;
 420         }
 421         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 422         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 423                                       lower_dir_dentry,
 424                                       encrypted_and_encoded_name_size);
 425         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 426         if (IS_ERR(lower_dentry)) {
 427                 rc = PTR_ERR(lower_dentry);
 428                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 429                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 430                                 encrypted_and_encoded_name);
 431                 goto out_d_drop;
 432         }
 433 interpose:
 434         rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
 435                                        ecryptfs_dir_inode);
 436         goto out;
 437 out_d_drop:
 438         d_drop(ecryptfs_dentry);
 439 out:
 440         kfree(encrypted_and_encoded_name);
 441         return ERR_PTR(rc);
 442 }
 443
 444 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 445                          struct dentry *new_dentry)
 446 {
 447         struct dentry *lower_old_dentry;
 448         struct dentry *lower_new_dentry;
 449         struct dentry *lower_dir_dentry;
 450         u64 file_size_save;
 451         int rc;
 452
 453         file_size_save = i_size_read(old_dentry->d_inode);
 454         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 455         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 456         dget(lower_old_dentry);
 457         dget(lower_new_dentry);
 458         lower_dir_dentry = lock_parent(lower_new_dentry);
 459         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 460                       lower_new_dentry);
 461         if (rc || !lower_new_dentry->d_inode)
 462                 goto out_lock;
 463         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
 464         if (rc)
 465                 goto out_lock;
 466         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 467         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 468         set_nlink(old_dentry->d_inode,
 469                   ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink);
 470         i_size_write(new_dentry->d_inode, file_size_save);
 471 out_lock:
 472         unlock_dir(lower_dir_dentry);
 473         dput(lower_new_dentry);
 474         dput(lower_old_dentry);
 475         return rc;
 476 }
 477
 478 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 479 {
 480         int rc = 0;
 481         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 482         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 483         struct dentry *lower_dir_dentry;
 484
 485         dget(lower_dentry);
 486         lower_dir_dentry = lock_parent(lower_dentry);
 487         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 488         if (rc) {
 489                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 490                 goto out_unlock;
 491         }
 492         fsstack_copy_attr_times(dir, lower_dir_inode);
 493         set_nlink(dentry->d_inode,
 494                   ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink);
 495         dentry->d_inode->i_ctime = dir->i_ctime;
 496         d_drop(dentry);
 497 out_unlock:
 498         unlock_dir(lower_dir_dentry);
 499         dput(lower_dentry);
 500         return rc;
 501 }
 502
 503 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 504                             const char *symname)
 505 {
 506         int rc;
 507         struct dentry *lower_dentry;
 508         struct dentry *lower_dir_dentry;
 509         char *encoded_symname;
 510         size_t encoded_symlen;
 511         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 512
 513         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 514         dget(lower_dentry);
 515         lower_dir_dentry = lock_parent(lower_dentry);
 516         mount_crypt_stat = &ecryptfs_superblock_to_private(
 517                 dir->i_sb)->mount_crypt_stat;
 518         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 519                                                   &encoded_symlen,
 520                                                   NULL,
 521                                                   mount_crypt_stat, symname,
 522                                                   strlen(symname));
 523         if (rc)
 524                 goto out_lock;
 525         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 526                          encoded_symname);
 527         kfree(encoded_symname);
 528         if (rc || !lower_dentry->d_inode)
 529                 goto out_lock;
 530         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 531         if (rc)
 532                 goto out_lock;
 533         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 534         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 535 out_lock:
 536         unlock_dir(lower_dir_dentry);
 537         dput(lower_dentry);
 538         if (!dentry->d_inode)
 539                 d_drop(dentry);
 540         return rc;
 541 }
 542
 543 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 544 {
 545         int rc;
 546         struct dentry *lower_dentry;
 547         struct dentry *lower_dir_dentry;
 548
 549         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 550         lower_dir_dentry = lock_parent(lower_dentry);
 551         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 552         if (rc || !lower_dentry->d_inode)
 553                 goto out;
 554         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 555         if (rc)
 556                 goto out;
 557         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 558         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 559         set_nlink(dir, lower_dir_dentry->d_inode->i_nlink);
 560 out:
 561         unlock_dir(lower_dir_dentry);
 562         if (!dentry->d_inode)
 563                 d_drop(dentry);
 564         return rc;
 565 }
 566
 567 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 568 {
 569         struct dentry *lower_dentry;
 570         struct dentry *lower_dir_dentry;
 571         int rc;
 572
 573         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 574         dget(dentry);
 575         lower_dir_dentry = lock_parent(lower_dentry);
 576         dget(lower_dentry);
 577         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 578         dput(lower_dentry);
 579         if (!rc && dentry->d_inode)
 580                 clear_nlink(dentry->d_inode);
 581         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 582         set_nlink(dir, lower_dir_dentry->d_inode->i_nlink);
 583         unlock_dir(lower_dir_dentry);
 584         if (!rc)
 585                 d_drop(dentry);
 586         dput(dentry);
 587         return rc;
 588 }
 589
 590 static int
 591 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
 592 {
 593         int rc;
 594         struct dentry *lower_dentry;
 595         struct dentry *lower_dir_dentry;
 596
 597         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 598         lower_dir_dentry = lock_parent(lower_dentry);
 599         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 600         if (rc || !lower_dentry->d_inode)
 601                 goto out;
 602         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 603         if (rc)
 604                 goto out;
 605         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 606         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 607 out:
 608         unlock_dir(lower_dir_dentry);
 609         if (!dentry->d_inode)
 610                 d_drop(dentry);
 611         return rc;
 612 }
 613
 614 static int
 615 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 616                 struct inode *new_dir, struct dentry *new_dentry)
 617 {
 618         int rc;
 619         struct dentry *lower_old_dentry;
 620         struct dentry *lower_new_dentry;
 621         struct dentry *lower_old_dir_dentry;
 622         struct dentry *lower_new_dir_dentry;
 623         struct dentry *trap = NULL;
 624
 625         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 626         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 627         dget(lower_old_dentry);
 628         dget(lower_new_dentry);
 629         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 630         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 631         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 632         /* source should not be ancestor of target */
 633         if (trap == lower_old_dentry) {
 634                 rc = -EINVAL;
 635                 goto out_lock;
 636         }
 637         /* target should not be ancestor of source */
 638         if (trap == lower_new_dentry) {
 639                 rc = -ENOTEMPTY;
 640                 goto out_lock;
 641         }
 642         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 643                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 644         if (rc)
 645                 goto out_lock;
 646         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 647         if (new_dir != old_dir)
 648                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 649 out_lock:
 650         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 651         dput(lower_new_dir_dentry);
 652         dput(lower_old_dir_dentry);
 653         dput(lower_new_dentry);
 654         dput(lower_old_dentry);
 655         return rc;
 656 }
 657
 658 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 659                                    size_t *bufsiz)
 660 {
 661         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 662         char *lower_buf;
 663         size_t lower_bufsiz = PATH_MAX;
 664         mm_segment_t old_fs;
 665         int rc;
 666
 667         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 668         if (!lower_buf) {
 669                 rc = -ENOMEM;
 670                 goto out;
 671         }
 672         old_fs = get_fs();
 673         set_fs(get_ds());
 674         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 675                                                    (char __user *)lower_buf,
 676                                                    lower_bufsiz);
 677         set_fs(old_fs);
 678         if (rc < 0)
 679                 goto out;
 680         lower_bufsiz = rc;
 681         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 682                                                   lower_buf, lower_bufsiz);
 683 out:
 684         kfree(lower_buf);
 685         return rc;
 686 }
 687
 688 static int
 689 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 690 {
 691         char *kbuf;
 692         size_t kbufsiz, copied;
 693         int rc;
 694
 695         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 696         if (rc)
 697                 goto out;
 698         copied = min_t(size_t, bufsiz, kbufsiz);
 699         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 700         kfree(kbuf);
 701         fsstack_copy_attr_atime(dentry->d_inode,
 702                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 703 out:
 704         return rc;
 705 }
 706
 707 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 708 {
 709         char *buf;
 710         int len = PAGE_SIZE, rc;
 711         mm_segment_t old_fs;
 712
 713         /* Released in ecryptfs_put_link(); only release here on error */
 714         buf = kmalloc(len, GFP_KERNEL);
 715         if (!buf) {
 716                 buf = ERR_PTR(-ENOMEM);
 717                 goto out;
 718         }
 719         old_fs = get_fs();
 720         set_fs(get_ds());
 721         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 722         set_fs(old_fs);
 723         if (rc < 0) {
 724                 kfree(buf);
 725                 buf = ERR_PTR(rc);
 726         } else
 727                 buf[rc] = '\0';
 728 out:
 729         nd_set_link(nd, buf);
 730         return NULL;
 731 }
 732
 733 static void
 734 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 735 {
 736         char *buf = nd_get_link(nd);
 737         if (!IS_ERR(buf)) {
 738                 /* Free the char* */
 739                 kfree(buf);
 740         }
 741 }
 742
 743 /**
 744  * upper_size_to_lower_size
 745  * @crypt_stat: Crypt_stat associated with file
 746  * @upper_size: Size of the upper file
 747  *
 748  * Calculate the required size of the lower file based on the
 749  * specified size of the upper file. This calculation is based on the
 750  * number of headers in the underlying file and the extent size.
 751  *
 752  * Returns Calculated size of the lower file.
 753  */
 754 static loff_t
 755 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 756                          loff_t upper_size)
 757 {
 758         loff_t lower_size;
 759
 760         lower_size = ecryptfs_lower_header_size(crypt_stat);
 761         if (upper_size != 0) {
 762                 loff_t num_extents;
 763
 764                 num_extents = upper_size >> crypt_stat->extent_shift;
 765                 if (upper_size & ~crypt_stat->extent_mask)
 766                         num_extents++;
 767                 lower_size += (num_extents * crypt_stat->extent_size);
 768         }
 769         return lower_size;
 770 }
 771
 772 /**
 773  * truncate_upper
 774  * @dentry: The ecryptfs layer dentry
 775  * @ia: Address of the ecryptfs inode's attributes
 776  * @lower_ia: Address of the lower inode's attributes
 777  *
 778  * Function to handle truncations modifying the size of the file. Note
 779  * that the file sizes are interpolated. When expanding, we are simply
 780  * writing strings of 0's out. When truncating, we truncate the upper
 781  * inode and update the lower_ia according to the page index
 782  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 783  * the caller must use lower_ia in a call to notify_change() to perform
 784  * the truncation of the lower inode.
 785  *
 786  * Returns zero on success; non-zero otherwise
 787  */
 788 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 789                           struct iattr *lower_ia)
 790 {
 791         int rc = 0;
 792         struct inode *inode = dentry->d_inode;
 793         struct ecryptfs_crypt_stat *crypt_stat;
 794         loff_t i_size = i_size_read(inode);
 795         loff_t lower_size_before_truncate;
 796         loff_t lower_size_after_truncate;
 797
 798         if (unlikely((ia->ia_size == i_size))) {
 799                 lower_ia->ia_valid &= ~ATTR_SIZE;
 800                 return 0;
 801         }
 802         rc = ecryptfs_get_lower_file(dentry, inode);
 803         if (rc)
 804                 return rc;
 805         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 806         /* Switch on growing or shrinking file */
 807         if (ia->ia_size > i_size) {
 808                 char zero[] = { 0x00 };
 809
 810                 lower_ia->ia_valid &= ~ATTR_SIZE;
 811                 /* Write a single 0 at the last position of the file;
 812                  * this triggers code that will fill in 0's throughout
 813                  * the intermediate portion of the previous end of the
 814                  * file and the new and of the file */
 815                 rc = ecryptfs_write(inode, zero,
 816                                     (ia->ia_size - 1), 1);
 817         } else { /* ia->ia_size < i_size_read(inode) */
 818                 /* We're chopping off all the pages down to the page
 819                  * in which ia->ia_size is located. Fill in the end of
 820                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 821                  * PAGE_CACHE_SIZE with zeros. */
 822                 size_t num_zeros = (PAGE_CACHE_SIZE
 823                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 824
 825                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 826                         truncate_setsize(inode, ia->ia_size);
 827                         lower_ia->ia_size = ia->ia_size;
 828                         lower_ia->ia_valid |= ATTR_SIZE;
 829                         goto out;
 830                 }
 831                 if (num_zeros) {
 832                         char *zeros_virt;
 833
 834                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 835                         if (!zeros_virt) {
 836                                 rc = -ENOMEM;
 837                                 goto out;
 838                         }
 839                         rc = ecryptfs_write(inode, zeros_virt,
 840                                             ia->ia_size, num_zeros);
 841                         kfree(zeros_virt);
 842                         if (rc) {
 843                                 printk(KERN_ERR "Error attempting to zero out "
 844                                        "the remainder of the end page on "
 845                                        "reducing truncate; rc = [%d]\n", rc);
 846                                 goto out;
 847                         }
 848                 }
 849                 truncate_setsize(inode, ia->ia_size);
 850                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 851                 if (rc) {
 852                         printk(KERN_ERR "Problem with "
 853                                "ecryptfs_write_inode_size_to_metadata; "
 854                                "rc = [%d]\n", rc);
 855                         goto out;
 856                 }
 857                 /* We are reducing the size of the ecryptfs file, and need to
 858                  * know if we need to reduce the size of the lower file. */
 859                 lower_size_before_truncate =
 860                     upper_size_to_lower_size(crypt_stat, i_size);
 861                 lower_size_after_truncate =
 862                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 863                 if (lower_size_after_truncate < lower_size_before_truncate) {
 864                         lower_ia->ia_size = lower_size_after_truncate;
 865                         lower_ia->ia_valid |= ATTR_SIZE;
 866                 } else
 867                         lower_ia->ia_valid &= ~ATTR_SIZE;
 868         }
 869 out:
 870         ecryptfs_put_lower_file(inode);
 871         return rc;
 872 }
 873
 874 static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
 875 {
 876         struct ecryptfs_crypt_stat *crypt_stat;
 877         loff_t lower_oldsize, lower_newsize;
 878
 879         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 880         lower_oldsize = upper_size_to_lower_size(crypt_stat,
 881                                                  i_size_read(inode));
 882         lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
 883         if (lower_newsize > lower_oldsize) {
 884                 /*
 885                  * The eCryptfs inode and the new *lower* size are mixed here
 886                  * because we may not have the lower i_mutex held and/or it may
 887                  * not be appropriate to call inode_newsize_ok() with inodes
 888                  * from other filesystems.
 889                  */
 890                 return inode_newsize_ok(inode, lower_newsize);
 891         }
 892
 893         return 0;
 894 }
 895
 896 /**
 897  * ecryptfs_truncate
 898  * @dentry: The ecryptfs layer dentry
 899  * @new_length: The length to expand the file to
 900  *
 901  * Simple function that handles the truncation of an eCryptfs inode and
 902  * its corresponding lower inode.
 903  *
 904  * Returns zero on success; non-zero otherwise
 905  */
 906 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 907 {
 908         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 909         struct iattr lower_ia = { .ia_valid = 0 };
 910         int rc;
 911
 912         rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length);
 913         if (rc)
 914                 return rc;
 915
 916         rc = truncate_upper(dentry, &ia, &lower_ia);
 917         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 918                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 919
 920                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 921                 rc = notify_change(lower_dentry, &lower_ia);
 922                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 923         }
 924         return rc;
 925 }
 926
 927 static int
 928 ecryptfs_permission(struct inode *inode, int mask)
 929 {
 930         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 931 }
 932
 933 /**
 934  * ecryptfs_setattr
 935  * @dentry: dentry handle to the inode to modify
 936  * @ia: Structure with flags of what to change and values
 937  *
 938  * Updates the metadata of an inode. If the update is to the size
 939  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 940  * of both the ecryptfs inode and the lower inode.
 941  *
 942  * All other metadata changes will be passed right to the lower filesystem,
 943  * and we will just update our inode to look like the lower.
 944  */
 945 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 946 {
 947         int rc = 0;
 948         struct dentry *lower_dentry;
 949         struct iattr lower_ia;
 950         struct inode *inode;
 951         struct inode *lower_inode;
 952         struct ecryptfs_crypt_stat *crypt_stat;
 953
 954         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 955         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 956                 ecryptfs_init_crypt_stat(crypt_stat);
 957         inode = dentry->d_inode;
 958         lower_inode = ecryptfs_inode_to_lower(inode);
 959         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 960         mutex_lock(&crypt_stat->cs_mutex);
 961         if (S_ISDIR(dentry->d_inode->i_mode))
 962                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 963         else if (S_ISREG(dentry->d_inode->i_mode)
 964                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 965                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 966                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 967
 968                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 969                         dentry->d_sb)->mount_crypt_stat;
 970                 rc = ecryptfs_get_lower_file(dentry, inode);
 971                 if (rc) {
 972                         mutex_unlock(&crypt_stat->cs_mutex);
 973                         goto out;
 974                 }
 975                 rc = ecryptfs_read_metadata(dentry);
 976                 ecryptfs_put_lower_file(inode);
 977                 if (rc) {
 978                         if (!(mount_crypt_stat->flags
 979                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 980                                 rc = -EIO;
 981                                 printk(KERN_WARNING "Either the lower file "
 982                                        "is not in a valid eCryptfs format, "
 983                                        "or the key could not be retrieved. "
 984                                        "Plaintext passthrough mode is not "
 985                                        "enabled; returning -EIO\n");
 986                                 mutex_unlock(&crypt_stat->cs_mutex);
 987                                 goto out;
 988                         }
 989                         rc = 0;
 990                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
 991                                                | ECRYPTFS_ENCRYPTED);
 992                 }
 993         }
 994         mutex_unlock(&crypt_stat->cs_mutex);
 995
 996         rc = inode_change_ok(inode, ia);
 997         if (rc)
 998                 goto out;
 999         if (ia->ia_valid & ATTR_SIZE) {
1000                 rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
1001                 if (rc)
1002                         goto out;
1003         }
1004
1005         if (S_ISREG(inode->i_mode)) {
1006                 rc = filemap_write_and_wait(inode->i_mapping);
1007                 if (rc)
1008                         goto out;
1009                 fsstack_copy_attr_all(inode, lower_inode);
1010         }
1011         memcpy(&lower_ia, ia, sizeof(lower_ia));
1012         if (ia->ia_valid & ATTR_FILE)
1013                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1014         if (ia->ia_valid & ATTR_SIZE) {
1015                 rc = truncate_upper(dentry, ia, &lower_ia);
1016                 if (rc < 0)
1017                         goto out;
1018         }
1019
1020         /*
1021          * mode change is for clearing setuid/setgid bits. Allow lower fs
1022          * to interpret this in its own way.
1023          */
1024         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1025                 lower_ia.ia_valid &= ~ATTR_MODE;
1026
1027         mutex_lock(&lower_dentry->d_inode->i_mutex);
1028         rc = notify_change(lower_dentry, &lower_ia);
1029         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1030 out:
1031         fsstack_copy_attr_all(inode, lower_inode);
1032         return rc;
1033 }
1034
1035 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1036                           struct kstat *stat)
1037 {
1038         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1039         int rc = 0;
1040
1041         mount_crypt_stat = &ecryptfs_superblock_to_private(
1042                                                 dentry->d_sb)->mount_crypt_stat;
1043         generic_fillattr(dentry->d_inode, stat);
1044         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1045                 char *target;
1046                 size_t targetsiz;
1047
1048                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1049                 if (!rc) {
1050                         kfree(target);
1051                         stat->size = targetsiz;
1052                 }
1053         }
1054         return rc;
1055 }
1056
1057 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1058                      struct kstat *stat)
1059 {
1060         struct kstat lower_stat;
1061         int rc;
1062
1063         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1064                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1065         if (!rc) {
1066                 fsstack_copy_attr_all(dentry->d_inode,
1067                                       ecryptfs_inode_to_lower(dentry->d_inode));
1068                 generic_fillattr(dentry->d_inode, stat);
1069                 stat->blocks = lower_stat.blocks;
1070         }
1071         return rc;
1072 }
1073
1074 int
1075 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1076                   size_t size, int flags)
1077 {
1078         int rc = 0;
1079         struct dentry *lower_dentry;
1080
1081         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1082         if (!lower_dentry->d_inode->i_op->setxattr) {
1083                 rc = -EOPNOTSUPP;
1084                 goto out;
1085         }
1086
1087         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1088         if (!rc)
1089                 fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode);
1090 out:
1091         return rc;
1092 }
1093
1094 ssize_t
1095 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1096                         void *value, size_t size)
1097 {
1098         int rc = 0;
1099
1100         if (!lower_dentry->d_inode->i_op->getxattr) {
1101                 rc = -EOPNOTSUPP;
1102                 goto out;
1103         }
1104         mutex_lock(&lower_dentry->d_inode->i_mutex);
1105         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1106                                                    size);
1107         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1108 out:
1109         return rc;
1110 }
1111
1112 static ssize_t
1113 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1114                   size_t size)
1115 {
1116         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1117                                        value, size);
1118 }
1119
1120 static ssize_t
1121 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
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->listxattr) {
1128                 rc = -EOPNOTSUPP;
1129                 goto out;
1130         }
1131         mutex_lock(&lower_dentry->d_inode->i_mutex);
1132         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1133         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1134 out:
1135         return rc;
1136 }
1137
1138 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1139 {
1140         int rc = 0;
1141         struct dentry *lower_dentry;
1142
1143         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1144         if (!lower_dentry->d_inode->i_op->removexattr) {
1145                 rc = -EOPNOTSUPP;
1146                 goto out;
1147         }
1148         mutex_lock(&lower_dentry->d_inode->i_mutex);
1149         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1150         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1151 out:
1152         return rc;
1153 }
1154
1155 const struct inode_operations ecryptfs_symlink_iops = {
1156         .readlink = ecryptfs_readlink,
1157         .follow_link = ecryptfs_follow_link,
1158         .put_link = ecryptfs_put_link,
1159         .permission = ecryptfs_permission,
1160         .setattr = ecryptfs_setattr,
1161         .getattr = ecryptfs_getattr_link,
1162         .setxattr = ecryptfs_setxattr,
1163         .getxattr = ecryptfs_getxattr,
1164         .listxattr = ecryptfs_listxattr,
1165         .removexattr = ecryptfs_removexattr
1166 };
1167
1168 const struct inode_operations ecryptfs_dir_iops = {
1169         .create = ecryptfs_create,
1170         .lookup = ecryptfs_lookup,
1171         .link = ecryptfs_link,
1172         .unlink = ecryptfs_unlink,
1173         .symlink = ecryptfs_symlink,
1174         .mkdir = ecryptfs_mkdir,
1175         .rmdir = ecryptfs_rmdir,
1176         .mknod = ecryptfs_mknod,
1177         .rename = ecryptfs_rename,
1178         .permission = ecryptfs_permission,
1179         .setattr = ecryptfs_setattr,
1180         .setxattr = ecryptfs_setxattr,
1181         .getxattr = ecryptfs_getxattr,
1182         .listxattr = ecryptfs_listxattr,
1183         .removexattr = ecryptfs_removexattr
1184 };
1185
1186 const struct inode_operations ecryptfs_main_iops = {
1187         .permission = ecryptfs_permission,
1188         .setattr = ecryptfs_setattr,
1189         .getattr = ecryptfs_getattr,
1190         .setxattr = ecryptfs_setxattr,
1191         .getxattr = ecryptfs_getxattr,
1192         .listxattr = ecryptfs_listxattr,
1193         .removexattr = ecryptfs_removexattr
1194 };