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 <asm/unaligned.h>
  36 #include "ecryptfs_kernel.h"
  37
  38 static struct dentry *lock_parent(struct dentry *dentry)
  39 {
  40         struct dentry *dir;
  41
  42         dir = dget_parent(dentry);
  43         mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
  44         return dir;
  45 }
  46
  47 static void unlock_dir(struct dentry *dir)
  48 {
  49         mutex_unlock(&dir->d_inode->i_mutex);
  50         dput(dir);
  51 }
  52
  53 /**
  54  * ecryptfs_create_underlying_file
  55  * @lower_dir_inode: inode of the parent in the lower fs of the new file
  56  * @dentry: New file's dentry
  57  * @mode: The mode of the new file
  58  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
  59  *
  60  * Creates the file in the lower file system.
  61  *
  62  * Returns zero on success; non-zero on error condition
  63  */
  64 static int
  65 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
  66                                 struct dentry *dentry, int mode,
  67                                 struct nameidata *nd)
  68 {
  69         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
  70         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
  71         struct dentry *dentry_save;
  72         struct vfsmount *vfsmount_save;
  73         int rc;
  74
  75         dentry_save = nd->path.dentry;
  76         vfsmount_save = nd->path.mnt;
  77         nd->path.dentry = lower_dentry;
  78         nd->path.mnt = lower_mnt;
  79         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
  80         nd->path.dentry = dentry_save;
  81         nd->path.mnt = vfsmount_save;
  82         return rc;
  83 }
  84
  85 /**
  86  * ecryptfs_do_create
  87  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
  88  * @ecryptfs_dentry: New file's dentry in ecryptfs
  89  * @mode: The mode of the new file
  90  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
  91  *
  92  * Creates the underlying file and the eCryptfs inode which will link to
  93  * it. It will also update the eCryptfs directory inode to mimic the
  94  * stat of the lower directory inode.
  95  *
  96  * Returns zero on success; non-zero on error condition
  97  */
  98 static int
  99 ecryptfs_do_create(struct inode *directory_inode,
 100                    struct dentry *ecryptfs_dentry, int mode,
 101                    struct nameidata *nd)
 102 {
 103         int rc;
 104         struct dentry *lower_dentry;
 105         struct dentry *lower_dir_dentry;
 106
 107         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 108         lower_dir_dentry = lock_parent(lower_dentry);
 109         if (IS_ERR(lower_dir_dentry)) {
 110                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 111                                 "dentry\n");
 112                 rc = PTR_ERR(lower_dir_dentry);
 113                 goto out;
 114         }
 115         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 116                                              ecryptfs_dentry, mode, nd);
 117         if (rc) {
 118                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 119                        "rc = [%d]\n", __func__, rc);
 120                 goto out_lock;
 121         }
 122         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 123                                 directory_inode->i_sb, 0);
 124         if (rc) {
 125                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 126                 goto out_lock;
 127         }
 128         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 129         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 130 out_lock:
 131         unlock_dir(lower_dir_dentry);
 132 out:
 133         return rc;
 134 }
 135
 136 /**
 137  * grow_file
 138  * @ecryptfs_dentry: the eCryptfs dentry
 139  *
 140  * This is the code which will grow the file to its correct size.
 141  */
 142 static int grow_file(struct dentry *ecryptfs_dentry)
 143 {
 144         struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
 145         struct file fake_file;
 146         struct ecryptfs_file_info tmp_file_info;
 147         char zero_virt[] = { 0x00 };
 148         int rc = 0;
 149
 150         memset(&fake_file, 0, sizeof(fake_file));
 151         fake_file.f_path.dentry = ecryptfs_dentry;
 152         memset(&tmp_file_info, 0, sizeof(tmp_file_info));
 153         ecryptfs_set_file_private(&fake_file, &tmp_file_info);
 154         ecryptfs_set_file_lower(
 155                 &fake_file,
 156                 ecryptfs_inode_to_private(ecryptfs_inode)->lower_file);
 157         rc = ecryptfs_write(&fake_file, zero_virt, 0, 1);
 158         i_size_write(ecryptfs_inode, 0);
 159         rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
 160         ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
 161                 ECRYPTFS_NEW_FILE;
 162         return rc;
 163 }
 164
 165 /**
 166  * ecryptfs_initialize_file
 167  *
 168  * Cause the file to be changed from a basic empty file to an ecryptfs
 169  * file with a header and first data page.
 170  *
 171  * Returns zero on success
 172  */
 173 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 174 {
 175         struct ecryptfs_crypt_stat *crypt_stat =
 176                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 177         int rc = 0;
 178
 179         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 180                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 181                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 182                 goto out;
 183         }
 184         crypt_stat->flags |= ECRYPTFS_NEW_FILE;
 185         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 186         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 187         if (rc) {
 188                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 189                                 "context; rc = [%d]\n", rc);
 190                 goto out;
 191         }
 192         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
 193                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 194                 if (rc) {
 195                         printk(KERN_ERR "%s: Error attempting to initialize "
 196                                "the persistent file for the dentry with name "
 197                                "[%s]; rc = [%d]\n", __func__,
 198                                ecryptfs_dentry->d_name.name, rc);
 199                         goto out;
 200                 }
 201         }
 202         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 203         if (rc) {
 204                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 205                 goto out;
 206         }
 207         rc = grow_file(ecryptfs_dentry);
 208         if (rc)
 209                 printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
 210 out:
 211         return rc;
 212 }
 213
 214 /**
 215  * ecryptfs_create
 216  * @dir: The inode of the directory in which to create the file.
 217  * @dentry: The eCryptfs dentry
 218  * @mode: The mode of the new file.
 219  * @nd: nameidata
 220  *
 221  * Creates a new file.
 222  *
 223  * Returns zero on success; non-zero on error condition
 224  */
 225 static int
 226 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 227                 int mode, struct nameidata *nd)
 228 {
 229         int rc;
 230
 231         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 232         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 233         if (unlikely(rc)) {
 234                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 235                                 "lower filesystem\n");
 236                 goto out;
 237         }
 238         /* At this point, a file exists on "disk"; we need to make sure
 239          * that this on disk file is prepared to be an ecryptfs file */
 240         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 241 out:
 242         return rc;
 243 }
 244
 245 /**
 246  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
 247  */
 248 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 249                                         struct dentry *lower_dentry,
 250                                         struct inode *ecryptfs_dir_inode,
 251                                         struct nameidata *ecryptfs_nd)
 252 {
 253         struct dentry *lower_dir_dentry;
 254         struct vfsmount *lower_mnt;
 255         struct inode *lower_inode;
 256         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 257         struct ecryptfs_crypt_stat *crypt_stat;
 258         char *page_virt = NULL;
 259         u64 file_size;
 260         int rc = 0;
 261
 262         lower_dir_dentry = lower_dentry->d_parent;
 263         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 264                                    ecryptfs_dentry->d_parent));
 265         lower_inode = lower_dentry->d_inode;
 266         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
 267         BUG_ON(!atomic_read(&lower_dentry->d_count));
 268         ecryptfs_set_dentry_private(ecryptfs_dentry,
 269                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
 270                                                      GFP_KERNEL));
 271         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
 272                 rc = -ENOMEM;
 273                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 274                        "to allocate ecryptfs_dentry_info struct\n",
 275                         __func__);
 276                 goto out_dput;
 277         }
 278         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 279         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
 280         if (!lower_dentry->d_inode) {
 281                 /* We want to add because we couldn't find in lower */
 282                 d_add(ecryptfs_dentry, NULL);
 283                 goto out;
 284         }
 285         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 286                                 ecryptfs_dir_inode->i_sb,
 287                                 ECRYPTFS_INTERPOSE_FLAG_D_ADD);
 288         if (rc) {
 289                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
 290                        __func__, rc);
 291                 goto out;
 292         }
 293         if (S_ISDIR(lower_inode->i_mode))
 294                 goto out;
 295         if (S_ISLNK(lower_inode->i_mode))
 296                 goto out;
 297         if (special_file(lower_inode->i_mode))
 298                 goto out;
 299         if (!ecryptfs_nd)
 300                 goto out;
 301         /* Released in this function */
 302         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
 303         if (!page_virt) {
 304                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
 305                        __func__);
 306                 rc = -ENOMEM;
 307                 goto out;
 308         }
 309         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
 310                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 311                 if (rc) {
 312                         printk(KERN_ERR "%s: Error attempting to initialize "
 313                                "the persistent file for the dentry with name "
 314                                "[%s]; rc = [%d]\n", __func__,
 315                                ecryptfs_dentry->d_name.name, rc);
 316                         goto out_free_kmem;
 317                 }
 318         }
 319         crypt_stat = &ecryptfs_inode_to_private(
 320                                         ecryptfs_dentry->d_inode)->crypt_stat;
 321         /* TODO: lock for crypt_stat comparison */
 322         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 323                         ecryptfs_set_default_sizes(crypt_stat);
 324         rc = ecryptfs_read_and_validate_header_region(page_virt,
 325                                                       ecryptfs_dentry->d_inode);
 326         if (rc) {
 327                 memset(page_virt, 0, PAGE_CACHE_SIZE);
 328                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 329                                                              ecryptfs_dentry);
 330                 if (rc) {
 331                         rc = 0;
 332                         goto out_free_kmem;
 333                 }
 334                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 335         }
 336         mount_crypt_stat = &ecryptfs_superblock_to_private(
 337                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 338         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
 339                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 340                         file_size = (crypt_stat->metadata_size
 341                                      + i_size_read(lower_dentry->d_inode));
 342                 else
 343                         file_size = i_size_read(lower_dentry->d_inode);
 344         } else {
 345                 file_size = get_unaligned_be64(page_virt);
 346         }
 347         i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
 348 out_free_kmem:
 349         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 350         goto out;
 351 out_dput:
 352         dput(lower_dentry);
 353         d_drop(ecryptfs_dentry);
 354 out:
 355         return rc;
 356 }
 357
 358 /**
 359  * ecryptfs_lookup
 360  * @ecryptfs_dir_inode: The eCryptfs directory inode
 361  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 362  * @ecryptfs_nd: nameidata; may be NULL
 363  *
 364  * Find a file on disk. If the file does not exist, then we'll add it to the
 365  * dentry cache and continue on to read it from the disk.
 366  */
 367 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 368                                       struct dentry *ecryptfs_dentry,
 369                                       struct nameidata *ecryptfs_nd)
 370 {
 371         char *encrypted_and_encoded_name = NULL;
 372         size_t encrypted_and_encoded_name_size;
 373         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 374         struct dentry *lower_dir_dentry, *lower_dentry;
 375         int rc = 0;
 376
 377         ecryptfs_dentry->d_op = &ecryptfs_dops;
 378         if ((ecryptfs_dentry->d_name.len == 1
 379              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 380             || (ecryptfs_dentry->d_name.len == 2
 381                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 382                 goto out_d_drop;
 383         }
 384         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 385         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 386         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 387                                       lower_dir_dentry,
 388                                       ecryptfs_dentry->d_name.len);
 389         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 390         if (IS_ERR(lower_dentry)) {
 391                 rc = PTR_ERR(lower_dentry);
 392                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 393                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 394                                 encrypted_and_encoded_name);
 395                 goto out_d_drop;
 396         }
 397         if (lower_dentry->d_inode)
 398                 goto lookup_and_interpose;
 399         mount_crypt_stat = &ecryptfs_superblock_to_private(
 400                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 401         if (!(mount_crypt_stat
 402             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 403                 goto lookup_and_interpose;
 404         dput(lower_dentry);
 405         rc = ecryptfs_encrypt_and_encode_filename(
 406                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 407                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 408                 ecryptfs_dentry->d_name.len);
 409         if (rc) {
 410                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 411                        "filename; rc = [%d]\n", __func__, rc);
 412                 goto out_d_drop;
 413         }
 414         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 415         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 416                                       lower_dir_dentry,
 417                                       encrypted_and_encoded_name_size - 1);
 418         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 419         if (IS_ERR(lower_dentry)) {
 420                 rc = PTR_ERR(lower_dentry);
 421                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 422                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 423                                 encrypted_and_encoded_name);
 424                 goto out_d_drop;
 425         }
 426 lookup_and_interpose:
 427         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
 428                                                  ecryptfs_dir_inode,
 429                                                  ecryptfs_nd);
 430         goto out;
 431 out_d_drop:
 432         d_drop(ecryptfs_dentry);
 433 out:
 434         kfree(encrypted_and_encoded_name);
 435         return ERR_PTR(rc);
 436 }
 437
 438 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 439                          struct dentry *new_dentry)
 440 {
 441         struct dentry *lower_old_dentry;
 442         struct dentry *lower_new_dentry;
 443         struct dentry *lower_dir_dentry;
 444         u64 file_size_save;
 445         int rc;
 446
 447         file_size_save = i_size_read(old_dentry->d_inode);
 448         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 449         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 450         dget(lower_old_dentry);
 451         dget(lower_new_dentry);
 452         lower_dir_dentry = lock_parent(lower_new_dentry);
 453         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 454                       lower_new_dentry);
 455         if (rc || !lower_new_dentry->d_inode)
 456                 goto out_lock;
 457         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
 458         if (rc)
 459                 goto out_lock;
 460         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 461         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 462         old_dentry->d_inode->i_nlink =
 463                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 464         i_size_write(new_dentry->d_inode, file_size_save);
 465 out_lock:
 466         unlock_dir(lower_dir_dentry);
 467         dput(lower_new_dentry);
 468         dput(lower_old_dentry);
 469         return rc;
 470 }
 471
 472 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 473 {
 474         int rc = 0;
 475         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 476         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 477         struct dentry *lower_dir_dentry;
 478
 479         dget(lower_dentry);
 480         lower_dir_dentry = lock_parent(lower_dentry);
 481         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 482         if (rc) {
 483                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 484                 goto out_unlock;
 485         }
 486         fsstack_copy_attr_times(dir, lower_dir_inode);
 487         dentry->d_inode->i_nlink =
 488                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 489         dentry->d_inode->i_ctime = dir->i_ctime;
 490         d_drop(dentry);
 491 out_unlock:
 492         unlock_dir(lower_dir_dentry);
 493         dput(lower_dentry);
 494         return rc;
 495 }
 496
 497 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 498                             const char *symname)
 499 {
 500         int rc;
 501         struct dentry *lower_dentry;
 502         struct dentry *lower_dir_dentry;
 503         char *encoded_symname;
 504         size_t encoded_symlen;
 505         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 506
 507         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 508         dget(lower_dentry);
 509         lower_dir_dentry = lock_parent(lower_dentry);
 510         mount_crypt_stat = &ecryptfs_superblock_to_private(
 511                 dir->i_sb)->mount_crypt_stat;
 512         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 513                                                   &encoded_symlen,
 514                                                   NULL,
 515                                                   mount_crypt_stat, symname,
 516                                                   strlen(symname));
 517         if (rc)
 518                 goto out_lock;
 519         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 520                          encoded_symname);
 521         kfree(encoded_symname);
 522         if (rc || !lower_dentry->d_inode)
 523                 goto out_lock;
 524         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 525         if (rc)
 526                 goto out_lock;
 527         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 528         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 529 out_lock:
 530         unlock_dir(lower_dir_dentry);
 531         dput(lower_dentry);
 532         if (!dentry->d_inode)
 533                 d_drop(dentry);
 534         return rc;
 535 }
 536
 537 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 538 {
 539         int rc;
 540         struct dentry *lower_dentry;
 541         struct dentry *lower_dir_dentry;
 542
 543         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 544         lower_dir_dentry = lock_parent(lower_dentry);
 545         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 546         if (rc || !lower_dentry->d_inode)
 547                 goto out;
 548         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 549         if (rc)
 550                 goto out;
 551         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 552         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 553         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 554 out:
 555         unlock_dir(lower_dir_dentry);
 556         if (!dentry->d_inode)
 557                 d_drop(dentry);
 558         return rc;
 559 }
 560
 561 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 562 {
 563         struct dentry *lower_dentry;
 564         struct dentry *lower_dir_dentry;
 565         int rc;
 566
 567         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 568         dget(dentry);
 569         lower_dir_dentry = lock_parent(lower_dentry);
 570         dget(lower_dentry);
 571         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 572         dput(lower_dentry);
 573         if (!rc)
 574                 d_delete(lower_dentry);
 575         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 576         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 577         unlock_dir(lower_dir_dentry);
 578         if (!rc)
 579                 d_drop(dentry);
 580         dput(dentry);
 581         return rc;
 582 }
 583
 584 static int
 585 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 586 {
 587         int rc;
 588         struct dentry *lower_dentry;
 589         struct dentry *lower_dir_dentry;
 590
 591         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 592         lower_dir_dentry = lock_parent(lower_dentry);
 593         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 594         if (rc || !lower_dentry->d_inode)
 595                 goto out;
 596         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 597         if (rc)
 598                 goto out;
 599         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 600         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 601 out:
 602         unlock_dir(lower_dir_dentry);
 603         if (!dentry->d_inode)
 604                 d_drop(dentry);
 605         return rc;
 606 }
 607
 608 static int
 609 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 610                 struct inode *new_dir, struct dentry *new_dentry)
 611 {
 612         int rc;
 613         struct dentry *lower_old_dentry;
 614         struct dentry *lower_new_dentry;
 615         struct dentry *lower_old_dir_dentry;
 616         struct dentry *lower_new_dir_dentry;
 617         struct dentry *trap = NULL;
 618
 619         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 620         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 621         dget(lower_old_dentry);
 622         dget(lower_new_dentry);
 623         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 624         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 625         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 626         /* source should not be ancestor of target */
 627         if (trap == lower_old_dentry) {
 628                 rc = -EINVAL;
 629                 goto out_lock;
 630         }
 631         /* target should not be ancestor of source */
 632         if (trap == lower_new_dentry) {
 633                 rc = -ENOTEMPTY;
 634                 goto out_lock;
 635         }
 636         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 637                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 638         if (rc)
 639                 goto out_lock;
 640         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 641         if (new_dir != old_dir)
 642                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 643 out_lock:
 644         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 645         dput(lower_new_dentry->d_parent);
 646         dput(lower_old_dentry->d_parent);
 647         dput(lower_new_dentry);
 648         dput(lower_old_dentry);
 649         return rc;
 650 }
 651
 652 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 653                                    size_t *bufsiz)
 654 {
 655         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 656         char *lower_buf;
 657         size_t lower_bufsiz = PATH_MAX;
 658         mm_segment_t old_fs;
 659         int rc;
 660
 661         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 662         if (!lower_buf) {
 663                 rc = -ENOMEM;
 664                 goto out;
 665         }
 666         old_fs = get_fs();
 667         set_fs(get_ds());
 668         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 669                                                    (char __user *)lower_buf,
 670                                                    lower_bufsiz);
 671         set_fs(old_fs);
 672         if (rc < 0)
 673                 goto out;
 674         lower_bufsiz = rc;
 675         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 676                                                   lower_buf, lower_bufsiz);
 677 out:
 678         kfree(lower_buf);
 679         return rc;
 680 }
 681
 682 static int
 683 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 684 {
 685         char *kbuf;
 686         size_t kbufsiz, copied;
 687         int rc;
 688
 689         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 690         if (rc)
 691                 goto out;
 692         copied = min_t(size_t, bufsiz, kbufsiz);
 693         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 694         kfree(kbuf);
 695         fsstack_copy_attr_atime(dentry->d_inode,
 696                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 697 out:
 698         return rc;
 699 }
 700
 701 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 702 {
 703         char *buf;
 704         int len = PAGE_SIZE, rc;
 705         mm_segment_t old_fs;
 706
 707         /* Released in ecryptfs_put_link(); only release here on error */
 708         buf = kmalloc(len, GFP_KERNEL);
 709         if (!buf) {
 710                 buf = ERR_PTR(-ENOMEM);
 711                 goto out;
 712         }
 713         old_fs = get_fs();
 714         set_fs(get_ds());
 715         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 716         set_fs(old_fs);
 717         if (rc < 0) {
 718                 kfree(buf);
 719                 buf = ERR_PTR(rc);
 720         } else
 721                 buf[rc] = '\0';
 722 out:
 723         nd_set_link(nd, buf);
 724         return NULL;
 725 }
 726
 727 static void
 728 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 729 {
 730         char *buf = nd_get_link(nd);
 731         if (!IS_ERR(buf)) {
 732                 /* Free the char* */
 733                 kfree(buf);
 734         }
 735 }
 736
 737 /**
 738  * upper_size_to_lower_size
 739  * @crypt_stat: Crypt_stat associated with file
 740  * @upper_size: Size of the upper file
 741  *
 742  * Calculate the required size of the lower file based on the
 743  * specified size of the upper file. This calculation is based on the
 744  * number of headers in the underlying file and the extent size.
 745  *
 746  * Returns Calculated size of the lower file.
 747  */
 748 static loff_t
 749 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 750                          loff_t upper_size)
 751 {
 752         loff_t lower_size;
 753
 754         lower_size = ecryptfs_lower_header_size(crypt_stat);
 755         if (upper_size != 0) {
 756                 loff_t num_extents;
 757
 758                 num_extents = upper_size >> crypt_stat->extent_shift;
 759                 if (upper_size & ~crypt_stat->extent_mask)
 760                         num_extents++;
 761                 lower_size += (num_extents * crypt_stat->extent_size);
 762         }
 763         return lower_size;
 764 }
 765
 766 /**
 767  * truncate_upper
 768  * @dentry: The ecryptfs layer dentry
 769  * @ia: Address of the ecryptfs inode's attributes
 770  * @lower_ia: Address of the lower inode's attributes
 771  *
 772  * Function to handle truncations modifying the size of the file. Note
 773  * that the file sizes are interpolated. When expanding, we are simply
 774  * writing strings of 0's out. When truncating, we truncate the upper
 775  * inode and update the lower_ia according to the page index
 776  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 777  * the caller must use lower_ia in a call to notify_change() to perform
 778  * the truncation of the lower inode.
 779  *
 780  * Returns zero on success; non-zero otherwise
 781  */
 782 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 783                           struct iattr *lower_ia)
 784 {
 785         int rc = 0;
 786         struct inode *inode = dentry->d_inode;
 787         struct dentry *lower_dentry;
 788         struct file fake_ecryptfs_file;
 789         struct ecryptfs_crypt_stat *crypt_stat;
 790         loff_t i_size = i_size_read(inode);
 791         loff_t lower_size_before_truncate;
 792         loff_t lower_size_after_truncate;
 793
 794         if (unlikely((ia->ia_size == i_size))) {
 795                 lower_ia->ia_valid &= ~ATTR_SIZE;
 796                 goto out;
 797         }
 798         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 799         /* Set up a fake ecryptfs file, this is used to interface with
 800          * the file in the underlying filesystem so that the
 801          * truncation has an effect there as well. */
 802         memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file));
 803         fake_ecryptfs_file.f_path.dentry = dentry;
 804         /* Released at out_free: label */
 805         ecryptfs_set_file_private(&fake_ecryptfs_file,
 806                                   kmem_cache_alloc(ecryptfs_file_info_cache,
 807                                                    GFP_KERNEL));
 808         if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) {
 809                 rc = -ENOMEM;
 810                 goto out;
 811         }
 812         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 813         ecryptfs_set_file_lower(
 814                 &fake_ecryptfs_file,
 815                 ecryptfs_inode_to_private(dentry->d_inode)->lower_file);
 816         /* Switch on growing or shrinking file */
 817         if (ia->ia_size > i_size) {
 818                 char zero[] = { 0x00 };
 819
 820                 lower_ia->ia_valid &= ~ATTR_SIZE;
 821                 /* Write a single 0 at the last position of the file;
 822                  * this triggers code that will fill in 0's throughout
 823                  * the intermediate portion of the previous end of the
 824                  * file and the new and of the file */
 825                 rc = ecryptfs_write(&fake_ecryptfs_file, zero,
 826                                     (ia->ia_size - 1), 1);
 827         } else { /* ia->ia_size < i_size_read(inode) */
 828                 /* We're chopping off all the pages down to the page
 829                  * in which ia->ia_size is located. Fill in the end of
 830                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 831                  * PAGE_CACHE_SIZE with zeros. */
 832                 size_t num_zeros = (PAGE_CACHE_SIZE
 833                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 834
 835                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 836                         rc = vmtruncate(inode, ia->ia_size);
 837                         if (rc)
 838                                 goto out_free;
 839                         lower_ia->ia_size = ia->ia_size;
 840                         lower_ia->ia_valid |= ATTR_SIZE;
 841                         goto out_free;
 842                 }
 843                 if (num_zeros) {
 844                         char *zeros_virt;
 845
 846                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 847                         if (!zeros_virt) {
 848                                 rc = -ENOMEM;
 849                                 goto out_free;
 850                         }
 851                         rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt,
 852                                             ia->ia_size, num_zeros);
 853                         kfree(zeros_virt);
 854                         if (rc) {
 855                                 printk(KERN_ERR "Error attempting to zero out "
 856                                        "the remainder of the end page on "
 857                                        "reducing truncate; rc = [%d]\n", rc);
 858                                 goto out_free;
 859                         }
 860                 }
 861                 vmtruncate(inode, ia->ia_size);
 862                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 863                 if (rc) {
 864                         printk(KERN_ERR "Problem with "
 865                                "ecryptfs_write_inode_size_to_metadata; "
 866                                "rc = [%d]\n", rc);
 867                         goto out_free;
 868                 }
 869                 /* We are reducing the size of the ecryptfs file, and need to
 870                  * know if we need to reduce the size of the lower file. */
 871                 lower_size_before_truncate =
 872                     upper_size_to_lower_size(crypt_stat, i_size);
 873                 lower_size_after_truncate =
 874                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 875                 if (lower_size_after_truncate < lower_size_before_truncate) {
 876                         lower_ia->ia_size = lower_size_after_truncate;
 877                         lower_ia->ia_valid |= ATTR_SIZE;
 878                 } else
 879                         lower_ia->ia_valid &= ~ATTR_SIZE;
 880         }
 881 out_free:
 882         if (ecryptfs_file_to_private(&fake_ecryptfs_file))
 883                 kmem_cache_free(ecryptfs_file_info_cache,
 884                                 ecryptfs_file_to_private(&fake_ecryptfs_file));
 885 out:
 886         return rc;
 887 }
 888
 889 /**
 890  * ecryptfs_truncate
 891  * @dentry: The ecryptfs layer dentry
 892  * @new_length: The length to expand the file to
 893  *
 894  * Simple function that handles the truncation of an eCryptfs inode and
 895  * its corresponding lower inode.
 896  *
 897  * Returns zero on success; non-zero otherwise
 898  */
 899 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 900 {
 901         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 902         struct iattr lower_ia = { .ia_valid = 0 };
 903         int rc;
 904
 905         rc = truncate_upper(dentry, &ia, &lower_ia);
 906         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 907                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 908
 909                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 910                 rc = notify_change(lower_dentry, &lower_ia);
 911                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 912         }
 913         return rc;
 914 }
 915
 916 static int
 917 ecryptfs_permission(struct inode *inode, int mask)
 918 {
 919         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 920 }
 921
 922 /**
 923  * ecryptfs_setattr
 924  * @dentry: dentry handle to the inode to modify
 925  * @ia: Structure with flags of what to change and values
 926  *
 927  * Updates the metadata of an inode. If the update is to the size
 928  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 929  * of both the ecryptfs inode and the lower inode.
 930  *
 931  * All other metadata changes will be passed right to the lower filesystem,
 932  * and we will just update our inode to look like the lower.
 933  */
 934 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 935 {
 936         int rc = 0;
 937         struct dentry *lower_dentry;
 938         struct iattr lower_ia;
 939         struct inode *inode;
 940         struct inode *lower_inode;
 941         struct ecryptfs_crypt_stat *crypt_stat;
 942
 943         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 944         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 945                 ecryptfs_init_crypt_stat(crypt_stat);
 946         inode = dentry->d_inode;
 947         lower_inode = ecryptfs_inode_to_lower(inode);
 948         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 949         mutex_lock(&crypt_stat->cs_mutex);
 950         if (S_ISDIR(dentry->d_inode->i_mode))
 951                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 952         else if (S_ISREG(dentry->d_inode->i_mode)
 953                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 954                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 955                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 956
 957                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 958                         dentry->d_sb)->mount_crypt_stat;
 959                 rc = ecryptfs_read_metadata(dentry);
 960                 if (rc) {
 961                         if (!(mount_crypt_stat->flags
 962                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 963                                 rc = -EIO;
 964                                 printk(KERN_WARNING "Either the lower file "
 965                                        "is not in a valid eCryptfs format, "
 966                                        "or the key could not be retrieved. "
 967                                        "Plaintext passthrough mode is not "
 968                                        "enabled; returning -EIO\n");
 969                                 mutex_unlock(&crypt_stat->cs_mutex);
 970                                 goto out;
 971                         }
 972                         rc = 0;
 973                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 974                 }
 975         }
 976         mutex_unlock(&crypt_stat->cs_mutex);
 977         memcpy(&lower_ia, ia, sizeof(lower_ia));
 978         if (ia->ia_valid & ATTR_FILE)
 979                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 980         if (ia->ia_valid & ATTR_SIZE) {
 981                 rc = truncate_upper(dentry, ia, &lower_ia);
 982                 if (rc < 0)
 983                         goto out;
 984         }
 985
 986         /*
 987          * mode change is for clearing setuid/setgid bits. Allow lower fs
 988          * to interpret this in its own way.
 989          */
 990         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
 991                 lower_ia.ia_valid &= ~ATTR_MODE;
 992
 993         mutex_lock(&lower_dentry->d_inode->i_mutex);
 994         rc = notify_change(lower_dentry, &lower_ia);
 995         mutex_unlock(&lower_dentry->d_inode->i_mutex);
 996 out:
 997         fsstack_copy_attr_all(inode, lower_inode);
 998         return rc;
 999 }
1000
1001 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1002                           struct kstat *stat)
1003 {
1004         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1005         int rc = 0;
1006
1007         mount_crypt_stat = &ecryptfs_superblock_to_private(
1008                                                 dentry->d_sb)->mount_crypt_stat;
1009         generic_fillattr(dentry->d_inode, stat);
1010         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1011                 char *target;
1012                 size_t targetsiz;
1013
1014                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1015                 if (!rc) {
1016                         kfree(target);
1017                         stat->size = targetsiz;
1018                 }
1019         }
1020         return rc;
1021 }
1022
1023 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1024                      struct kstat *stat)
1025 {
1026         struct kstat lower_stat;
1027         int rc;
1028
1029         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1030                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1031         if (!rc) {
1032                 generic_fillattr(dentry->d_inode, stat);
1033                 stat->blocks = lower_stat.blocks;
1034         }
1035         return rc;
1036 }
1037
1038 int
1039 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1040                   size_t size, int flags)
1041 {
1042         int rc = 0;
1043         struct dentry *lower_dentry;
1044
1045         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1046         if (!lower_dentry->d_inode->i_op->setxattr) {
1047                 rc = -EOPNOTSUPP;
1048                 goto out;
1049         }
1050         mutex_lock(&lower_dentry->d_inode->i_mutex);
1051         rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
1052                                                    size, flags);
1053         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1054 out:
1055         return rc;
1056 }
1057
1058 ssize_t
1059 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1060                         void *value, size_t size)
1061 {
1062         int rc = 0;
1063
1064         if (!lower_dentry->d_inode->i_op->getxattr) {
1065                 rc = -EOPNOTSUPP;
1066                 goto out;
1067         }
1068         mutex_lock(&lower_dentry->d_inode->i_mutex);
1069         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1070                                                    size);
1071         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1072 out:
1073         return rc;
1074 }
1075
1076 static ssize_t
1077 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1078                   size_t size)
1079 {
1080         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1081                                        value, size);
1082 }
1083
1084 static ssize_t
1085 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1086 {
1087         int rc = 0;
1088         struct dentry *lower_dentry;
1089
1090         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1091         if (!lower_dentry->d_inode->i_op->listxattr) {
1092                 rc = -EOPNOTSUPP;
1093                 goto out;
1094         }
1095         mutex_lock(&lower_dentry->d_inode->i_mutex);
1096         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1097         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1098 out:
1099         return rc;
1100 }
1101
1102 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1103 {
1104         int rc = 0;
1105         struct dentry *lower_dentry;
1106
1107         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1108         if (!lower_dentry->d_inode->i_op->removexattr) {
1109                 rc = -EOPNOTSUPP;
1110                 goto out;
1111         }
1112         mutex_lock(&lower_dentry->d_inode->i_mutex);
1113         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1114         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1115 out:
1116         return rc;
1117 }
1118
1119 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1120 {
1121         if ((ecryptfs_inode_to_lower(inode)
1122              == (struct inode *)candidate_lower_inode))
1123                 return 1;
1124         else
1125                 return 0;
1126 }
1127
1128 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1129 {
1130         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1131         return 0;
1132 }
1133
1134 const struct inode_operations ecryptfs_symlink_iops = {
1135         .readlink = ecryptfs_readlink,
1136         .follow_link = ecryptfs_follow_link,
1137         .put_link = ecryptfs_put_link,
1138         .permission = ecryptfs_permission,
1139         .setattr = ecryptfs_setattr,
1140         .getattr = ecryptfs_getattr_link,
1141         .setxattr = ecryptfs_setxattr,
1142         .getxattr = ecryptfs_getxattr,
1143         .listxattr = ecryptfs_listxattr,
1144         .removexattr = ecryptfs_removexattr
1145 };
1146
1147 const struct inode_operations ecryptfs_dir_iops = {
1148         .create = ecryptfs_create,
1149         .lookup = ecryptfs_lookup,
1150         .link = ecryptfs_link,
1151         .unlink = ecryptfs_unlink,
1152         .symlink = ecryptfs_symlink,
1153         .mkdir = ecryptfs_mkdir,
1154         .rmdir = ecryptfs_rmdir,
1155         .mknod = ecryptfs_mknod,
1156         .rename = ecryptfs_rename,
1157         .permission = ecryptfs_permission,
1158         .setattr = ecryptfs_setattr,
1159         .setxattr = ecryptfs_setxattr,
1160         .getxattr = ecryptfs_getxattr,
1161         .listxattr = ecryptfs_listxattr,
1162         .removexattr = ecryptfs_removexattr
1163 };
1164
1165 const struct inode_operations ecryptfs_main_iops = {
1166         .permission = ecryptfs_permission,
1167         .setattr = ecryptfs_setattr,
1168         .getattr = ecryptfs_getattr,
1169         .setxattr = ecryptfs_setxattr,
1170         .getxattr = ecryptfs_getxattr,
1171         .listxattr = ecryptfs_listxattr,
1172         .removexattr = ecryptfs_removexattr
1173 };