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                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 328                                                              ecryptfs_dentry);
 329                 if (rc) {
 330                         rc = 0;
 331                         goto out_free_kmem;
 332                 }
 333                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 334         }
 335         mount_crypt_stat = &ecryptfs_superblock_to_private(
 336                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 337         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
 338                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 339                         file_size = (crypt_stat->num_header_bytes_at_front
 340                                      + i_size_read(lower_dentry->d_inode));
 341                 else
 342                         file_size = i_size_read(lower_dentry->d_inode);
 343         } else {
 344                 file_size = get_unaligned_be64(page_virt);
 345         }
 346         i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
 347 out_free_kmem:
 348         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 349         goto out;
 350 out_dput:
 351         dput(lower_dentry);
 352         d_drop(ecryptfs_dentry);
 353 out:
 354         return rc;
 355 }
 356
 357 /**
 358  * ecryptfs_lookup
 359  * @ecryptfs_dir_inode: The eCryptfs directory inode
 360  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 361  * @ecryptfs_nd: nameidata; may be NULL
 362  *
 363  * Find a file on disk. If the file does not exist, then we'll add it to the
 364  * dentry cache and continue on to read it from the disk.
 365  */
 366 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 367                                       struct dentry *ecryptfs_dentry,
 368                                       struct nameidata *ecryptfs_nd)
 369 {
 370         char *encrypted_and_encoded_name = NULL;
 371         size_t encrypted_and_encoded_name_size;
 372         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 373         struct dentry *lower_dir_dentry, *lower_dentry;
 374         int rc = 0;
 375
 376         ecryptfs_dentry->d_op = &ecryptfs_dops;
 377         if ((ecryptfs_dentry->d_name.len == 1
 378              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 379             || (ecryptfs_dentry->d_name.len == 2
 380                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 381                 goto out_d_drop;
 382         }
 383         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 384         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 385         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 386                                       lower_dir_dentry,
 387                                       ecryptfs_dentry->d_name.len);
 388         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 389         if (IS_ERR(lower_dentry)) {
 390                 rc = PTR_ERR(lower_dentry);
 391                 printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
 392                        "lower_dentry = [%s]\n", __func__, rc,
 393                        ecryptfs_dentry->d_name.name);
 394                 goto out_d_drop;
 395         }
 396         if (lower_dentry->d_inode)
 397                 goto lookup_and_interpose;
 398         mount_crypt_stat = &ecryptfs_superblock_to_private(
 399                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 400         if (!(mount_crypt_stat
 401             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 402                 goto lookup_and_interpose;
 403         dput(lower_dentry);
 404         rc = ecryptfs_encrypt_and_encode_filename(
 405                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 406                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 407                 ecryptfs_dentry->d_name.len);
 408         if (rc) {
 409                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 410                        "filename; rc = [%d]\n", __func__, rc);
 411                 goto out_d_drop;
 412         }
 413         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 414         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 415                                       lower_dir_dentry,
 416                                       encrypted_and_encoded_name_size - 1);
 417         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 418         if (IS_ERR(lower_dentry)) {
 419                 rc = PTR_ERR(lower_dentry);
 420                 printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
 421                        "lower_dentry = [%s]\n", __func__, rc,
 422                        encrypted_and_encoded_name);
 423                 goto out_d_drop;
 424         }
 425 lookup_and_interpose:
 426         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
 427                                                  ecryptfs_dir_inode,
 428                                                  ecryptfs_nd);
 429         goto out;
 430 out_d_drop:
 431         d_drop(ecryptfs_dentry);
 432 out:
 433         kfree(encrypted_and_encoded_name);
 434         return ERR_PTR(rc);
 435 }
 436
 437 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 438                          struct dentry *new_dentry)
 439 {
 440         struct dentry *lower_old_dentry;
 441         struct dentry *lower_new_dentry;
 442         struct dentry *lower_dir_dentry;
 443         u64 file_size_save;
 444         int rc;
 445
 446         file_size_save = i_size_read(old_dentry->d_inode);
 447         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 448         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 449         dget(lower_old_dentry);
 450         dget(lower_new_dentry);
 451         lower_dir_dentry = lock_parent(lower_new_dentry);
 452         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 453                       lower_new_dentry);
 454         if (rc || !lower_new_dentry->d_inode)
 455                 goto out_lock;
 456         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
 457         if (rc)
 458                 goto out_lock;
 459         fsstack_copy_attr_times(dir, lower_new_dentry->d_inode);
 460         fsstack_copy_inode_size(dir, lower_new_dentry->d_inode);
 461         old_dentry->d_inode->i_nlink =
 462                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 463         i_size_write(new_dentry->d_inode, file_size_save);
 464 out_lock:
 465         unlock_dir(lower_dir_dentry);
 466         dput(lower_new_dentry);
 467         dput(lower_old_dentry);
 468         return rc;
 469 }
 470
 471 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 472 {
 473         int rc = 0;
 474         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 475         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 476         struct dentry *lower_dir_dentry;
 477
 478         dget(lower_dentry);
 479         lower_dir_dentry = lock_parent(lower_dentry);
 480         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 481         if (rc) {
 482                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 483                 goto out_unlock;
 484         }
 485         fsstack_copy_attr_times(dir, lower_dir_inode);
 486         dentry->d_inode->i_nlink =
 487                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 488         dentry->d_inode->i_ctime = dir->i_ctime;
 489         d_drop(dentry);
 490 out_unlock:
 491         unlock_dir(lower_dir_dentry);
 492         dput(lower_dentry);
 493         return rc;
 494 }
 495
 496 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 497                             const char *symname)
 498 {
 499         int rc;
 500         struct dentry *lower_dentry;
 501         struct dentry *lower_dir_dentry;
 502         char *encoded_symname;
 503         size_t encoded_symlen;
 504         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 505
 506         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 507         dget(lower_dentry);
 508         lower_dir_dentry = lock_parent(lower_dentry);
 509         mount_crypt_stat = &ecryptfs_superblock_to_private(
 510                 dir->i_sb)->mount_crypt_stat;
 511         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 512                                                   &encoded_symlen,
 513                                                   NULL,
 514                                                   mount_crypt_stat, symname,
 515                                                   strlen(symname));
 516         if (rc)
 517                 goto out_lock;
 518         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 519                          encoded_symname);
 520         kfree(encoded_symname);
 521         if (rc || !lower_dentry->d_inode)
 522                 goto out_lock;
 523         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 524         if (rc)
 525                 goto out_lock;
 526         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 527         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 528 out_lock:
 529         unlock_dir(lower_dir_dentry);
 530         dput(lower_dentry);
 531         if (!dentry->d_inode)
 532                 d_drop(dentry);
 533         return rc;
 534 }
 535
 536 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 537 {
 538         int rc;
 539         struct dentry *lower_dentry;
 540         struct dentry *lower_dir_dentry;
 541
 542         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 543         lower_dir_dentry = lock_parent(lower_dentry);
 544         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 545         if (rc || !lower_dentry->d_inode)
 546                 goto out;
 547         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 548         if (rc)
 549                 goto out;
 550         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 551         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 552         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 553 out:
 554         unlock_dir(lower_dir_dentry);
 555         if (!dentry->d_inode)
 556                 d_drop(dentry);
 557         return rc;
 558 }
 559
 560 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 561 {
 562         struct dentry *lower_dentry;
 563         struct dentry *lower_dir_dentry;
 564         int rc;
 565
 566         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 567         dget(dentry);
 568         lower_dir_dentry = lock_parent(lower_dentry);
 569         dget(lower_dentry);
 570         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 571         dput(lower_dentry);
 572         if (!rc)
 573                 d_delete(lower_dentry);
 574         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 575         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 576         unlock_dir(lower_dir_dentry);
 577         if (!rc)
 578                 d_drop(dentry);
 579         dput(dentry);
 580         return rc;
 581 }
 582
 583 static int
 584 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 585 {
 586         int rc;
 587         struct dentry *lower_dentry;
 588         struct dentry *lower_dir_dentry;
 589
 590         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 591         lower_dir_dentry = lock_parent(lower_dentry);
 592         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 593         if (rc || !lower_dentry->d_inode)
 594                 goto out;
 595         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 596         if (rc)
 597                 goto out;
 598         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 599         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 600 out:
 601         unlock_dir(lower_dir_dentry);
 602         if (!dentry->d_inode)
 603                 d_drop(dentry);
 604         return rc;
 605 }
 606
 607 static int
 608 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 609                 struct inode *new_dir, struct dentry *new_dentry)
 610 {
 611         int rc;
 612         struct dentry *lower_old_dentry;
 613         struct dentry *lower_new_dentry;
 614         struct dentry *lower_old_dir_dentry;
 615         struct dentry *lower_new_dir_dentry;
 616         struct dentry *trap = NULL;
 617
 618         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 619         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 620         dget(lower_old_dentry);
 621         dget(lower_new_dentry);
 622         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 623         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 624         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 625         /* source should not be ancestor of target */
 626         if (trap == lower_old_dentry) {
 627                 rc = -EINVAL;
 628                 goto out_lock;
 629         }
 630         /* target should not be ancestor of source */
 631         if (trap == lower_new_dentry) {
 632                 rc = -ENOTEMPTY;
 633                 goto out_lock;
 634         }
 635         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 636                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 637         if (rc)
 638                 goto out_lock;
 639         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 640         if (new_dir != old_dir)
 641                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 642 out_lock:
 643         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 644         dput(lower_new_dentry->d_parent);
 645         dput(lower_old_dentry->d_parent);
 646         dput(lower_new_dentry);
 647         dput(lower_old_dentry);
 648         return rc;
 649 }
 650
 651 static int
 652 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 653 {
 654         char *lower_buf;
 655         size_t lower_bufsiz;
 656         struct dentry *lower_dentry;
 657         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 658         char *plaintext_name;
 659         size_t plaintext_name_size;
 660         mm_segment_t old_fs;
 661         int rc;
 662
 663         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 664         if (!lower_dentry->d_inode->i_op->readlink) {
 665                 rc = -EINVAL;
 666                 goto out;
 667         }
 668         mount_crypt_stat = &ecryptfs_superblock_to_private(
 669                                                 dentry->d_sb)->mount_crypt_stat;
 670         /*
 671          * If the lower filename is encrypted, it will result in a significantly
 672          * longer name.  If needed, truncate the name after decode and decrypt.
 673          */
 674         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
 675                 lower_bufsiz = PATH_MAX;
 676         else
 677                 lower_bufsiz = bufsiz;
 678         /* Released in this function */
 679         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 680         if (lower_buf == NULL) {
 681                 printk(KERN_ERR "%s: Out of memory whilst attempting to "
 682                        "kmalloc [%zd] bytes\n", __func__, lower_bufsiz);
 683                 rc = -ENOMEM;
 684                 goto out;
 685         }
 686         old_fs = get_fs();
 687         set_fs(get_ds());
 688         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 689                                                    (char __user *)lower_buf,
 690                                                    lower_bufsiz);
 691         set_fs(old_fs);
 692         if (rc >= 0) {
 693                 rc = ecryptfs_decode_and_decrypt_filename(&plaintext_name,
 694                                                           &plaintext_name_size,
 695                                                           dentry, lower_buf,
 696                                                           rc);
 697                 if (rc) {
 698                         printk(KERN_ERR "%s: Error attempting to decode and "
 699                                "decrypt filename; rc = [%d]\n", __func__,
 700                                 rc);
 701                         goto out_free_lower_buf;
 702                 }
 703                 /* Check for bufsiz <= 0 done in sys_readlinkat() */
 704                 rc = copy_to_user(buf, plaintext_name,
 705                                   min((size_t) bufsiz, plaintext_name_size));
 706                 if (rc)
 707                         rc = -EFAULT;
 708                 else
 709                         rc = plaintext_name_size;
 710                 kfree(plaintext_name);
 711                 fsstack_copy_attr_atime(dentry->d_inode, lower_dentry->d_inode);
 712         }
 713 out_free_lower_buf:
 714         kfree(lower_buf);
 715 out:
 716         return rc;
 717 }
 718
 719 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 720 {
 721         char *buf;
 722         int len = PAGE_SIZE, rc;
 723         mm_segment_t old_fs;
 724
 725         /* Released in ecryptfs_put_link(); only release here on error */
 726         buf = kmalloc(len, GFP_KERNEL);
 727         if (!buf) {
 728                 buf = ERR_PTR(-ENOMEM);
 729                 goto out;
 730         }
 731         old_fs = get_fs();
 732         set_fs(get_ds());
 733         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 734         set_fs(old_fs);
 735         if (rc < 0) {
 736                 kfree(buf);
 737                 buf = ERR_PTR(rc);
 738         } else
 739                 buf[rc] = '\0';
 740 out:
 741         nd_set_link(nd, buf);
 742         return NULL;
 743 }
 744
 745 static void
 746 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 747 {
 748         char *buf = nd_get_link(nd);
 749         if (!IS_ERR(buf)) {
 750                 /* Free the char* */
 751                 kfree(buf);
 752         }
 753 }
 754
 755 /**
 756  * upper_size_to_lower_size
 757  * @crypt_stat: Crypt_stat associated with file
 758  * @upper_size: Size of the upper file
 759  *
 760  * Calculate the required size of the lower file based on the
 761  * specified size of the upper file. This calculation is based on the
 762  * number of headers in the underlying file and the extent size.
 763  *
 764  * Returns Calculated size of the lower file.
 765  */
 766 static loff_t
 767 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 768                          loff_t upper_size)
 769 {
 770         loff_t lower_size;
 771
 772         lower_size = crypt_stat->num_header_bytes_at_front;
 773         if (upper_size != 0) {
 774                 loff_t num_extents;
 775
 776                 num_extents = upper_size >> crypt_stat->extent_shift;
 777                 if (upper_size & ~crypt_stat->extent_mask)
 778                         num_extents++;
 779                 lower_size += (num_extents * crypt_stat->extent_size);
 780         }
 781         return lower_size;
 782 }
 783
 784 /**
 785  * truncate_upper
 786  * @dentry: The ecryptfs layer dentry
 787  * @ia: Address of the ecryptfs inode's attributes
 788  * @lower_ia: Address of the lower inode's attributes
 789  *
 790  * Function to handle truncations modifying the size of the file. Note
 791  * that the file sizes are interpolated. When expanding, we are simply
 792  * writing strings of 0's out. When truncating, we truncate the upper
 793  * inode and update the lower_ia according to the page index
 794  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 795  * the caller must use lower_ia in a call to notify_change() to perform
 796  * the truncation of the lower inode.
 797  *
 798  * Returns zero on success; non-zero otherwise
 799  */
 800 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 801                           struct iattr *lower_ia)
 802 {
 803         int rc = 0;
 804         struct inode *inode = dentry->d_inode;
 805         struct dentry *lower_dentry;
 806         struct file fake_ecryptfs_file;
 807         struct ecryptfs_crypt_stat *crypt_stat;
 808         loff_t i_size = i_size_read(inode);
 809         loff_t lower_size_before_truncate;
 810         loff_t lower_size_after_truncate;
 811
 812         if (unlikely((ia->ia_size == i_size))) {
 813                 lower_ia->ia_valid &= ~ATTR_SIZE;
 814                 goto out;
 815         }
 816         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 817         /* Set up a fake ecryptfs file, this is used to interface with
 818          * the file in the underlying filesystem so that the
 819          * truncation has an effect there as well. */
 820         memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file));
 821         fake_ecryptfs_file.f_path.dentry = dentry;
 822         /* Released at out_free: label */
 823         ecryptfs_set_file_private(&fake_ecryptfs_file,
 824                                   kmem_cache_alloc(ecryptfs_file_info_cache,
 825                                                    GFP_KERNEL));
 826         if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) {
 827                 rc = -ENOMEM;
 828                 goto out;
 829         }
 830         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 831         ecryptfs_set_file_lower(
 832                 &fake_ecryptfs_file,
 833                 ecryptfs_inode_to_private(dentry->d_inode)->lower_file);
 834         /* Switch on growing or shrinking file */
 835         if (ia->ia_size > i_size) {
 836                 char zero[] = { 0x00 };
 837
 838                 lower_ia->ia_valid &= ~ATTR_SIZE;
 839                 /* Write a single 0 at the last position of the file;
 840                  * this triggers code that will fill in 0's throughout
 841                  * the intermediate portion of the previous end of the
 842                  * file and the new and of the file */
 843                 rc = ecryptfs_write(&fake_ecryptfs_file, zero,
 844                                     (ia->ia_size - 1), 1);
 845         } else { /* ia->ia_size < i_size_read(inode) */
 846                 /* We're chopping off all the pages down to the page
 847                  * in which ia->ia_size is located. Fill in the end of
 848                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 849                  * PAGE_CACHE_SIZE with zeros. */
 850                 size_t num_zeros = (PAGE_CACHE_SIZE
 851                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 852
 853                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 854                         rc = vmtruncate(inode, ia->ia_size);
 855                         if (rc)
 856                                 goto out_free;
 857                         lower_ia->ia_size = ia->ia_size;
 858                         lower_ia->ia_valid |= ATTR_SIZE;
 859                         goto out_free;
 860                 }
 861                 if (num_zeros) {
 862                         char *zeros_virt;
 863
 864                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 865                         if (!zeros_virt) {
 866                                 rc = -ENOMEM;
 867                                 goto out_free;
 868                         }
 869                         rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt,
 870                                             ia->ia_size, num_zeros);
 871                         kfree(zeros_virt);
 872                         if (rc) {
 873                                 printk(KERN_ERR "Error attempting to zero out "
 874                                        "the remainder of the end page on "
 875                                        "reducing truncate; rc = [%d]\n", rc);
 876                                 goto out_free;
 877                         }
 878                 }
 879                 vmtruncate(inode, ia->ia_size);
 880                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 881                 if (rc) {
 882                         printk(KERN_ERR "Problem with "
 883                                "ecryptfs_write_inode_size_to_metadata; "
 884                                "rc = [%d]\n", rc);
 885                         goto out_free;
 886                 }
 887                 /* We are reducing the size of the ecryptfs file, and need to
 888                  * know if we need to reduce the size of the lower file. */
 889                 lower_size_before_truncate =
 890                     upper_size_to_lower_size(crypt_stat, i_size);
 891                 lower_size_after_truncate =
 892                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 893                 if (lower_size_after_truncate < lower_size_before_truncate) {
 894                         lower_ia->ia_size = lower_size_after_truncate;
 895                         lower_ia->ia_valid |= ATTR_SIZE;
 896                 } else
 897                         lower_ia->ia_valid &= ~ATTR_SIZE;
 898         }
 899 out_free:
 900         if (ecryptfs_file_to_private(&fake_ecryptfs_file))
 901                 kmem_cache_free(ecryptfs_file_info_cache,
 902                                 ecryptfs_file_to_private(&fake_ecryptfs_file));
 903 out:
 904         return rc;
 905 }
 906
 907 /**
 908  * ecryptfs_truncate
 909  * @dentry: The ecryptfs layer dentry
 910  * @new_length: The length to expand the file to
 911  *
 912  * Simple function that handles the truncation of an eCryptfs inode and
 913  * its corresponding lower inode.
 914  *
 915  * Returns zero on success; non-zero otherwise
 916  */
 917 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 918 {
 919         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 920         struct iattr lower_ia = { .ia_valid = 0 };
 921         int rc;
 922
 923         rc = truncate_upper(dentry, &ia, &lower_ia);
 924         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 925                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 926
 927                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 928                 rc = notify_change(lower_dentry, &lower_ia);
 929                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 930         }
 931         return rc;
 932 }
 933
 934 static int
 935 ecryptfs_permission(struct inode *inode, int mask)
 936 {
 937         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 938 }
 939
 940 /**
 941  * ecryptfs_setattr
 942  * @dentry: dentry handle to the inode to modify
 943  * @ia: Structure with flags of what to change and values
 944  *
 945  * Updates the metadata of an inode. If the update is to the size
 946  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 947  * of both the ecryptfs inode and the lower inode.
 948  *
 949  * All other metadata changes will be passed right to the lower filesystem,
 950  * and we will just update our inode to look like the lower.
 951  */
 952 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 953 {
 954         int rc = 0;
 955         struct dentry *lower_dentry;
 956         struct iattr lower_ia;
 957         struct inode *inode;
 958         struct inode *lower_inode;
 959         struct ecryptfs_crypt_stat *crypt_stat;
 960
 961         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 962         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 963                 ecryptfs_init_crypt_stat(crypt_stat);
 964         inode = dentry->d_inode;
 965         lower_inode = ecryptfs_inode_to_lower(inode);
 966         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 967         mutex_lock(&crypt_stat->cs_mutex);
 968         if (S_ISDIR(dentry->d_inode->i_mode))
 969                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 970         else if (S_ISREG(dentry->d_inode->i_mode)
 971                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 972                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 973                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 974
 975                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 976                         dentry->d_sb)->mount_crypt_stat;
 977                 rc = ecryptfs_read_metadata(dentry);
 978                 if (rc) {
 979                         if (!(mount_crypt_stat->flags
 980                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 981                                 rc = -EIO;
 982                                 printk(KERN_WARNING "Either the lower file "
 983                                        "is not in a valid eCryptfs format, "
 984                                        "or the key could not be retrieved. "
 985                                        "Plaintext passthrough mode is not "
 986                                        "enabled; returning -EIO\n");
 987                                 mutex_unlock(&crypt_stat->cs_mutex);
 988                                 goto out;
 989                         }
 990                         rc = 0;
 991                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 992                 }
 993         }
 994         mutex_unlock(&crypt_stat->cs_mutex);
 995         memcpy(&lower_ia, ia, sizeof(lower_ia));
 996         if (ia->ia_valid & ATTR_FILE)
 997                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 998         if (ia->ia_valid & ATTR_SIZE) {
 999                 rc = truncate_upper(dentry, ia, &lower_ia);
1000                 if (rc < 0)
1001                         goto out;
1002         }
1003
1004         /*
1005          * mode change is for clearing setuid/setgid bits. Allow lower fs
1006          * to interpret this in its own way.
1007          */
1008         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1009                 lower_ia.ia_valid &= ~ATTR_MODE;
1010
1011         mutex_lock(&lower_dentry->d_inode->i_mutex);
1012         rc = notify_change(lower_dentry, &lower_ia);
1013         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1014 out:
1015         fsstack_copy_attr_all(inode, lower_inode);
1016         return rc;
1017 }
1018
1019 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1020                      struct kstat *stat)
1021 {
1022         struct kstat lower_stat;
1023         int rc;
1024
1025         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1026                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1027         if (!rc) {
1028                 generic_fillattr(dentry->d_inode, stat);
1029                 stat->blocks = lower_stat.blocks;
1030         }
1031         return rc;
1032 }
1033
1034 int
1035 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1036                   size_t size, int flags)
1037 {
1038         int rc = 0;
1039         struct dentry *lower_dentry;
1040
1041         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1042         if (!lower_dentry->d_inode->i_op->setxattr) {
1043                 rc = -ENOSYS;
1044                 goto out;
1045         }
1046         mutex_lock(&lower_dentry->d_inode->i_mutex);
1047         rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
1048                                                    size, flags);
1049         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1050 out:
1051         return rc;
1052 }
1053
1054 ssize_t
1055 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1056                         void *value, size_t size)
1057 {
1058         int rc = 0;
1059
1060         if (!lower_dentry->d_inode->i_op->getxattr) {
1061                 rc = -ENOSYS;
1062                 goto out;
1063         }
1064         mutex_lock(&lower_dentry->d_inode->i_mutex);
1065         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1066                                                    size);
1067         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1068 out:
1069         return rc;
1070 }
1071
1072 static ssize_t
1073 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1074                   size_t size)
1075 {
1076         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1077                                        value, size);
1078 }
1079
1080 static ssize_t
1081 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1082 {
1083         int rc = 0;
1084         struct dentry *lower_dentry;
1085
1086         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1087         if (!lower_dentry->d_inode->i_op->listxattr) {
1088                 rc = -ENOSYS;
1089                 goto out;
1090         }
1091         mutex_lock(&lower_dentry->d_inode->i_mutex);
1092         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1093         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1094 out:
1095         return rc;
1096 }
1097
1098 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1099 {
1100         int rc = 0;
1101         struct dentry *lower_dentry;
1102
1103         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1104         if (!lower_dentry->d_inode->i_op->removexattr) {
1105                 rc = -ENOSYS;
1106                 goto out;
1107         }
1108         mutex_lock(&lower_dentry->d_inode->i_mutex);
1109         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1110         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1111 out:
1112         return rc;
1113 }
1114
1115 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1116 {
1117         if ((ecryptfs_inode_to_lower(inode)
1118              == (struct inode *)candidate_lower_inode))
1119                 return 1;
1120         else
1121                 return 0;
1122 }
1123
1124 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1125 {
1126         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1127         return 0;
1128 }
1129
1130 const struct inode_operations ecryptfs_symlink_iops = {
1131         .readlink = ecryptfs_readlink,
1132         .follow_link = ecryptfs_follow_link,
1133         .put_link = ecryptfs_put_link,
1134         .permission = ecryptfs_permission,
1135         .setattr = ecryptfs_setattr,
1136         .setxattr = ecryptfs_setxattr,
1137         .getxattr = ecryptfs_getxattr,
1138         .listxattr = ecryptfs_listxattr,
1139         .removexattr = ecryptfs_removexattr
1140 };
1141
1142 const struct inode_operations ecryptfs_dir_iops = {
1143         .create = ecryptfs_create,
1144         .lookup = ecryptfs_lookup,
1145         .link = ecryptfs_link,
1146         .unlink = ecryptfs_unlink,
1147         .symlink = ecryptfs_symlink,
1148         .mkdir = ecryptfs_mkdir,
1149         .rmdir = ecryptfs_rmdir,
1150         .mknod = ecryptfs_mknod,
1151         .rename = ecryptfs_rename,
1152         .permission = ecryptfs_permission,
1153         .setattr = ecryptfs_setattr,
1154         .setxattr = ecryptfs_setxattr,
1155         .getxattr = ecryptfs_getxattr,
1156         .listxattr = ecryptfs_listxattr,
1157         .removexattr = ecryptfs_removexattr
1158 };
1159
1160 const struct inode_operations ecryptfs_main_iops = {
1161         .permission = ecryptfs_permission,
1162         .setattr = ecryptfs_setattr,
1163         .getattr = ecryptfs_getattr,
1164         .setxattr = ecryptfs_setxattr,
1165         .getxattr = ecryptfs_getxattr,
1166         .listxattr = ecryptfs_listxattr,
1167         .removexattr = ecryptfs_removexattr
1168 };