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_put;
 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_put:
 352         dput(lower_dentry);
 353         mntput(lower_mnt);
 354         d_drop(ecryptfs_dentry);
 355 out:
 356         return rc;
 357 }
 358
 359 /**
 360  * ecryptfs_lookup
 361  * @ecryptfs_dir_inode: The eCryptfs directory inode
 362  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 363  * @ecryptfs_nd: nameidata; may be NULL
 364  *
 365  * Find a file on disk. If the file does not exist, then we'll add it to the
 366  * dentry cache and continue on to read it from the disk.
 367  */
 368 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 369                                       struct dentry *ecryptfs_dentry,
 370                                       struct nameidata *ecryptfs_nd)
 371 {
 372         char *encrypted_and_encoded_name = NULL;
 373         size_t encrypted_and_encoded_name_size;
 374         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 375         struct dentry *lower_dir_dentry, *lower_dentry;
 376         int rc = 0;
 377
 378         ecryptfs_dentry->d_op = &ecryptfs_dops;
 379         if ((ecryptfs_dentry->d_name.len == 1
 380              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 381             || (ecryptfs_dentry->d_name.len == 2
 382                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 383                 goto out_d_drop;
 384         }
 385         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 386         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 387         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 388                                       lower_dir_dentry,
 389                                       ecryptfs_dentry->d_name.len);
 390         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 391         if (IS_ERR(lower_dentry)) {
 392                 rc = PTR_ERR(lower_dentry);
 393                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 394                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 395                                 encrypted_and_encoded_name);
 396                 goto out_d_drop;
 397         }
 398         if (lower_dentry->d_inode)
 399                 goto lookup_and_interpose;
 400         mount_crypt_stat = &ecryptfs_superblock_to_private(
 401                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 402         if (!(mount_crypt_stat
 403             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 404                 goto lookup_and_interpose;
 405         dput(lower_dentry);
 406         rc = ecryptfs_encrypt_and_encode_filename(
 407                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 408                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 409                 ecryptfs_dentry->d_name.len);
 410         if (rc) {
 411                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 412                        "filename; rc = [%d]\n", __func__, rc);
 413                 goto out_d_drop;
 414         }
 415         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 416         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 417                                       lower_dir_dentry,
 418                                       encrypted_and_encoded_name_size - 1);
 419         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 420         if (IS_ERR(lower_dentry)) {
 421                 rc = PTR_ERR(lower_dentry);
 422                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 423                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 424                                 encrypted_and_encoded_name);
 425                 goto out_d_drop;
 426         }
 427 lookup_and_interpose:
 428         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
 429                                                  ecryptfs_dir_inode,
 430                                                  ecryptfs_nd);
 431         goto out;
 432 out_d_drop:
 433         d_drop(ecryptfs_dentry);
 434 out:
 435         kfree(encrypted_and_encoded_name);
 436         return ERR_PTR(rc);
 437 }
 438
 439 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 440                          struct dentry *new_dentry)
 441 {
 442         struct dentry *lower_old_dentry;
 443         struct dentry *lower_new_dentry;
 444         struct dentry *lower_dir_dentry;
 445         u64 file_size_save;
 446         int rc;
 447
 448         file_size_save = i_size_read(old_dentry->d_inode);
 449         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 450         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 451         dget(lower_old_dentry);
 452         dget(lower_new_dentry);
 453         lower_dir_dentry = lock_parent(lower_new_dentry);
 454         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 455                       lower_new_dentry);
 456         if (rc || !lower_new_dentry->d_inode)
 457                 goto out_lock;
 458         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
 459         if (rc)
 460                 goto out_lock;
 461         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 462         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 463         old_dentry->d_inode->i_nlink =
 464                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 465         i_size_write(new_dentry->d_inode, file_size_save);
 466 out_lock:
 467         unlock_dir(lower_dir_dentry);
 468         dput(lower_new_dentry);
 469         dput(lower_old_dentry);
 470         return rc;
 471 }
 472
 473 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 474 {
 475         int rc = 0;
 476         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 477         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 478         struct dentry *lower_dir_dentry;
 479
 480         dget(lower_dentry);
 481         lower_dir_dentry = lock_parent(lower_dentry);
 482         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 483         if (rc) {
 484                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 485                 goto out_unlock;
 486         }
 487         fsstack_copy_attr_times(dir, lower_dir_inode);
 488         dentry->d_inode->i_nlink =
 489                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 490         dentry->d_inode->i_ctime = dir->i_ctime;
 491         d_drop(dentry);
 492 out_unlock:
 493         unlock_dir(lower_dir_dentry);
 494         dput(lower_dentry);
 495         return rc;
 496 }
 497
 498 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 499                             const char *symname)
 500 {
 501         int rc;
 502         struct dentry *lower_dentry;
 503         struct dentry *lower_dir_dentry;
 504         char *encoded_symname;
 505         size_t encoded_symlen;
 506         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 507
 508         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 509         dget(lower_dentry);
 510         lower_dir_dentry = lock_parent(lower_dentry);
 511         mount_crypt_stat = &ecryptfs_superblock_to_private(
 512                 dir->i_sb)->mount_crypt_stat;
 513         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 514                                                   &encoded_symlen,
 515                                                   NULL,
 516                                                   mount_crypt_stat, symname,
 517                                                   strlen(symname));
 518         if (rc)
 519                 goto out_lock;
 520         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 521                          encoded_symname);
 522         kfree(encoded_symname);
 523         if (rc || !lower_dentry->d_inode)
 524                 goto out_lock;
 525         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 526         if (rc)
 527                 goto out_lock;
 528         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 529         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 530 out_lock:
 531         unlock_dir(lower_dir_dentry);
 532         dput(lower_dentry);
 533         if (!dentry->d_inode)
 534                 d_drop(dentry);
 535         return rc;
 536 }
 537
 538 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 539 {
 540         int rc;
 541         struct dentry *lower_dentry;
 542         struct dentry *lower_dir_dentry;
 543
 544         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 545         lower_dir_dentry = lock_parent(lower_dentry);
 546         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 547         if (rc || !lower_dentry->d_inode)
 548                 goto out;
 549         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 550         if (rc)
 551                 goto out;
 552         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 553         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 554         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 555 out:
 556         unlock_dir(lower_dir_dentry);
 557         if (!dentry->d_inode)
 558                 d_drop(dentry);
 559         return rc;
 560 }
 561
 562 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 563 {
 564         struct dentry *lower_dentry;
 565         struct dentry *lower_dir_dentry;
 566         int rc;
 567
 568         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 569         dget(dentry);
 570         lower_dir_dentry = lock_parent(lower_dentry);
 571         dget(lower_dentry);
 572         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 573         dput(lower_dentry);
 574         if (!rc)
 575                 d_delete(lower_dentry);
 576         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 577         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 578         unlock_dir(lower_dir_dentry);
 579         if (!rc)
 580                 d_drop(dentry);
 581         dput(dentry);
 582         return rc;
 583 }
 584
 585 static int
 586 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 587 {
 588         int rc;
 589         struct dentry *lower_dentry;
 590         struct dentry *lower_dir_dentry;
 591
 592         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 593         lower_dir_dentry = lock_parent(lower_dentry);
 594         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 595         if (rc || !lower_dentry->d_inode)
 596                 goto out;
 597         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 598         if (rc)
 599                 goto out;
 600         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 601         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 602 out:
 603         unlock_dir(lower_dir_dentry);
 604         if (!dentry->d_inode)
 605                 d_drop(dentry);
 606         return rc;
 607 }
 608
 609 static int
 610 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 611                 struct inode *new_dir, struct dentry *new_dentry)
 612 {
 613         int rc;
 614         struct dentry *lower_old_dentry;
 615         struct dentry *lower_new_dentry;
 616         struct dentry *lower_old_dir_dentry;
 617         struct dentry *lower_new_dir_dentry;
 618         struct dentry *trap = NULL;
 619
 620         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 621         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 622         dget(lower_old_dentry);
 623         dget(lower_new_dentry);
 624         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 625         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 626         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 627         /* source should not be ancestor of target */
 628         if (trap == lower_old_dentry) {
 629                 rc = -EINVAL;
 630                 goto out_lock;
 631         }
 632         /* target should not be ancestor of source */
 633         if (trap == lower_new_dentry) {
 634                 rc = -ENOTEMPTY;
 635                 goto out_lock;
 636         }
 637         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 638                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 639         if (rc)
 640                 goto out_lock;
 641         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 642         if (new_dir != old_dir)
 643                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 644 out_lock:
 645         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 646         dput(lower_new_dentry->d_parent);
 647         dput(lower_old_dentry->d_parent);
 648         dput(lower_new_dentry);
 649         dput(lower_old_dentry);
 650         return rc;
 651 }
 652
 653 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 654                                    size_t *bufsiz)
 655 {
 656         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 657         char *lower_buf;
 658         size_t lower_bufsiz = PATH_MAX;
 659         mm_segment_t old_fs;
 660         int rc;
 661
 662         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 663         if (!lower_buf) {
 664                 rc = -ENOMEM;
 665                 goto out;
 666         }
 667         old_fs = get_fs();
 668         set_fs(get_ds());
 669         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 670                                                    (char __user *)lower_buf,
 671                                                    lower_bufsiz);
 672         set_fs(old_fs);
 673         if (rc < 0)
 674                 goto out;
 675         lower_bufsiz = rc;
 676         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 677                                                   lower_buf, lower_bufsiz);
 678 out:
 679         kfree(lower_buf);
 680         return rc;
 681 }
 682
 683 static int
 684 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 685 {
 686         char *kbuf;
 687         size_t kbufsiz, copied;
 688         int rc;
 689
 690         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 691         if (rc)
 692                 goto out;
 693         copied = min_t(size_t, bufsiz, kbufsiz);
 694         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 695         kfree(kbuf);
 696         fsstack_copy_attr_atime(dentry->d_inode,
 697                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 698 out:
 699         return rc;
 700 }
 701
 702 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 703 {
 704         char *buf;
 705         int len = PAGE_SIZE, rc;
 706         mm_segment_t old_fs;
 707
 708         /* Released in ecryptfs_put_link(); only release here on error */
 709         buf = kmalloc(len, GFP_KERNEL);
 710         if (!buf) {
 711                 buf = ERR_PTR(-ENOMEM);
 712                 goto out;
 713         }
 714         old_fs = get_fs();
 715         set_fs(get_ds());
 716         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 717         set_fs(old_fs);
 718         if (rc < 0) {
 719                 kfree(buf);
 720                 buf = ERR_PTR(rc);
 721         } else
 722                 buf[rc] = '\0';
 723 out:
 724         nd_set_link(nd, buf);
 725         return NULL;
 726 }
 727
 728 static void
 729 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 730 {
 731         char *buf = nd_get_link(nd);
 732         if (!IS_ERR(buf)) {
 733                 /* Free the char* */
 734                 kfree(buf);
 735         }
 736 }
 737
 738 /**
 739  * upper_size_to_lower_size
 740  * @crypt_stat: Crypt_stat associated with file
 741  * @upper_size: Size of the upper file
 742  *
 743  * Calculate the required size of the lower file based on the
 744  * specified size of the upper file. This calculation is based on the
 745  * number of headers in the underlying file and the extent size.
 746  *
 747  * Returns Calculated size of the lower file.
 748  */
 749 static loff_t
 750 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 751                          loff_t upper_size)
 752 {
 753         loff_t lower_size;
 754
 755         lower_size = ecryptfs_lower_header_size(crypt_stat);
 756         if (upper_size != 0) {
 757                 loff_t num_extents;
 758
 759                 num_extents = upper_size >> crypt_stat->extent_shift;
 760                 if (upper_size & ~crypt_stat->extent_mask)
 761                         num_extents++;
 762                 lower_size += (num_extents * crypt_stat->extent_size);
 763         }
 764         return lower_size;
 765 }
 766
 767 /**
 768  * truncate_upper
 769  * @dentry: The ecryptfs layer dentry
 770  * @ia: Address of the ecryptfs inode's attributes
 771  * @lower_ia: Address of the lower inode's attributes
 772  *
 773  * Function to handle truncations modifying the size of the file. Note
 774  * that the file sizes are interpolated. When expanding, we are simply
 775  * writing strings of 0's out. When truncating, we truncate the upper
 776  * inode and update the lower_ia according to the page index
 777  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 778  * the caller must use lower_ia in a call to notify_change() to perform
 779  * the truncation of the lower inode.
 780  *
 781  * Returns zero on success; non-zero otherwise
 782  */
 783 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 784                           struct iattr *lower_ia)
 785 {
 786         int rc = 0;
 787         struct inode *inode = dentry->d_inode;
 788         struct dentry *lower_dentry;
 789         struct file fake_ecryptfs_file;
 790         struct ecryptfs_crypt_stat *crypt_stat;
 791         loff_t i_size = i_size_read(inode);
 792         loff_t lower_size_before_truncate;
 793         loff_t lower_size_after_truncate;
 794
 795         if (unlikely((ia->ia_size == i_size))) {
 796                 lower_ia->ia_valid &= ~ATTR_SIZE;
 797                 goto out;
 798         }
 799         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 800         /* Set up a fake ecryptfs file, this is used to interface with
 801          * the file in the underlying filesystem so that the
 802          * truncation has an effect there as well. */
 803         memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file));
 804         fake_ecryptfs_file.f_path.dentry = dentry;
 805         /* Released at out_free: label */
 806         ecryptfs_set_file_private(&fake_ecryptfs_file,
 807                                   kmem_cache_alloc(ecryptfs_file_info_cache,
 808                                                    GFP_KERNEL));
 809         if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) {
 810                 rc = -ENOMEM;
 811                 goto out;
 812         }
 813         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 814         ecryptfs_set_file_lower(
 815                 &fake_ecryptfs_file,
 816                 ecryptfs_inode_to_private(dentry->d_inode)->lower_file);
 817         /* Switch on growing or shrinking file */
 818         if (ia->ia_size > i_size) {
 819                 char zero[] = { 0x00 };
 820
 821                 lower_ia->ia_valid &= ~ATTR_SIZE;
 822                 /* Write a single 0 at the last position of the file;
 823                  * this triggers code that will fill in 0's throughout
 824                  * the intermediate portion of the previous end of the
 825                  * file and the new and of the file */
 826                 rc = ecryptfs_write(&fake_ecryptfs_file, zero,
 827                                     (ia->ia_size - 1), 1);
 828         } else { /* ia->ia_size < i_size_read(inode) */
 829                 /* We're chopping off all the pages down to the page
 830                  * in which ia->ia_size is located. Fill in the end of
 831                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 832                  * PAGE_CACHE_SIZE with zeros. */
 833                 size_t num_zeros = (PAGE_CACHE_SIZE
 834                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 835
 836                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 837                         rc = vmtruncate(inode, ia->ia_size);
 838                         if (rc)
 839                                 goto out_free;
 840                         lower_ia->ia_size = ia->ia_size;
 841                         lower_ia->ia_valid |= ATTR_SIZE;
 842                         goto out_free;
 843                 }
 844                 if (num_zeros) {
 845                         char *zeros_virt;
 846
 847                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 848                         if (!zeros_virt) {
 849                                 rc = -ENOMEM;
 850                                 goto out_free;
 851                         }
 852                         rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt,
 853                                             ia->ia_size, num_zeros);
 854                         kfree(zeros_virt);
 855                         if (rc) {
 856                                 printk(KERN_ERR "Error attempting to zero out "
 857                                        "the remainder of the end page on "
 858                                        "reducing truncate; rc = [%d]\n", rc);
 859                                 goto out_free;
 860                         }
 861                 }
 862                 vmtruncate(inode, ia->ia_size);
 863                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 864                 if (rc) {
 865                         printk(KERN_ERR "Problem with "
 866                                "ecryptfs_write_inode_size_to_metadata; "
 867                                "rc = [%d]\n", rc);
 868                         goto out_free;
 869                 }
 870                 /* We are reducing the size of the ecryptfs file, and need to
 871                  * know if we need to reduce the size of the lower file. */
 872                 lower_size_before_truncate =
 873                     upper_size_to_lower_size(crypt_stat, i_size);
 874                 lower_size_after_truncate =
 875                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 876                 if (lower_size_after_truncate < lower_size_before_truncate) {
 877                         lower_ia->ia_size = lower_size_after_truncate;
 878                         lower_ia->ia_valid |= ATTR_SIZE;
 879                 } else
 880                         lower_ia->ia_valid &= ~ATTR_SIZE;
 881         }
 882 out_free:
 883         if (ecryptfs_file_to_private(&fake_ecryptfs_file))
 884                 kmem_cache_free(ecryptfs_file_info_cache,
 885                                 ecryptfs_file_to_private(&fake_ecryptfs_file));
 886 out:
 887         return rc;
 888 }
 889
 890 /**
 891  * ecryptfs_truncate
 892  * @dentry: The ecryptfs layer dentry
 893  * @new_length: The length to expand the file to
 894  *
 895  * Simple function that handles the truncation of an eCryptfs inode and
 896  * its corresponding lower inode.
 897  *
 898  * Returns zero on success; non-zero otherwise
 899  */
 900 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 901 {
 902         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 903         struct iattr lower_ia = { .ia_valid = 0 };
 904         int rc;
 905
 906         rc = truncate_upper(dentry, &ia, &lower_ia);
 907         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 908                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 909
 910                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 911                 rc = notify_change(lower_dentry, &lower_ia);
 912                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 913         }
 914         return rc;
 915 }
 916
 917 static int
 918 ecryptfs_permission(struct inode *inode, int mask)
 919 {
 920         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 921 }
 922
 923 /**
 924  * ecryptfs_setattr
 925  * @dentry: dentry handle to the inode to modify
 926  * @ia: Structure with flags of what to change and values
 927  *
 928  * Updates the metadata of an inode. If the update is to the size
 929  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 930  * of both the ecryptfs inode and the lower inode.
 931  *
 932  * All other metadata changes will be passed right to the lower filesystem,
 933  * and we will just update our inode to look like the lower.
 934  */
 935 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 936 {
 937         int rc = 0;
 938         struct dentry *lower_dentry;
 939         struct iattr lower_ia;
 940         struct inode *inode;
 941         struct inode *lower_inode;
 942         struct ecryptfs_crypt_stat *crypt_stat;
 943
 944         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 945         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 946                 ecryptfs_init_crypt_stat(crypt_stat);
 947         inode = dentry->d_inode;
 948         lower_inode = ecryptfs_inode_to_lower(inode);
 949         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 950         mutex_lock(&crypt_stat->cs_mutex);
 951         if (S_ISDIR(dentry->d_inode->i_mode))
 952                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 953         else if (S_ISREG(dentry->d_inode->i_mode)
 954                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 955                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 956                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 957
 958                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 959                         dentry->d_sb)->mount_crypt_stat;
 960                 rc = ecryptfs_read_metadata(dentry);
 961                 if (rc) {
 962                         if (!(mount_crypt_stat->flags
 963                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 964                                 rc = -EIO;
 965                                 printk(KERN_WARNING "Either the lower file "
 966                                        "is not in a valid eCryptfs format, "
 967                                        "or the key could not be retrieved. "
 968                                        "Plaintext passthrough mode is not "
 969                                        "enabled; returning -EIO\n");
 970                                 mutex_unlock(&crypt_stat->cs_mutex);
 971                                 goto out;
 972                         }
 973                         rc = 0;
 974                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 975                 }
 976         }
 977         mutex_unlock(&crypt_stat->cs_mutex);
 978         memcpy(&lower_ia, ia, sizeof(lower_ia));
 979         if (ia->ia_valid & ATTR_FILE)
 980                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 981         if (ia->ia_valid & ATTR_SIZE) {
 982                 rc = truncate_upper(dentry, ia, &lower_ia);
 983                 if (rc < 0)
 984                         goto out;
 985         }
 986
 987         /*
 988          * mode change is for clearing setuid/setgid bits. Allow lower fs
 989          * to interpret this in its own way.
 990          */
 991         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
 992                 lower_ia.ia_valid &= ~ATTR_MODE;
 993
 994         mutex_lock(&lower_dentry->d_inode->i_mutex);
 995         rc = notify_change(lower_dentry, &lower_ia);
 996         mutex_unlock(&lower_dentry->d_inode->i_mutex);
 997 out:
 998         fsstack_copy_attr_all(inode, lower_inode);
 999         return rc;
1000 }
1001
1002 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1003                           struct kstat *stat)
1004 {
1005         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1006         int rc = 0;
1007
1008         mount_crypt_stat = &ecryptfs_superblock_to_private(
1009                                                 dentry->d_sb)->mount_crypt_stat;
1010         generic_fillattr(dentry->d_inode, stat);
1011         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1012                 char *target;
1013                 size_t targetsiz;
1014
1015                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1016                 if (!rc) {
1017                         kfree(target);
1018                         stat->size = targetsiz;
1019                 }
1020         }
1021         return rc;
1022 }
1023
1024 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1025                      struct kstat *stat)
1026 {
1027         struct kstat lower_stat;
1028         int rc;
1029
1030         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1031                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1032         if (!rc) {
1033                 generic_fillattr(dentry->d_inode, stat);
1034                 stat->blocks = lower_stat.blocks;
1035         }
1036         return rc;
1037 }
1038
1039 int
1040 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1041                   size_t size, int flags)
1042 {
1043         int rc = 0;
1044         struct dentry *lower_dentry;
1045
1046         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1047         if (!lower_dentry->d_inode->i_op->setxattr) {
1048                 rc = -EOPNOTSUPP;
1049                 goto out;
1050         }
1051         mutex_lock(&lower_dentry->d_inode->i_mutex);
1052         rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
1053                                                    size, flags);
1054         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1055 out:
1056         return rc;
1057 }
1058
1059 ssize_t
1060 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1061                         void *value, size_t size)
1062 {
1063         int rc = 0;
1064
1065         if (!lower_dentry->d_inode->i_op->getxattr) {
1066                 rc = -EOPNOTSUPP;
1067                 goto out;
1068         }
1069         mutex_lock(&lower_dentry->d_inode->i_mutex);
1070         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1071                                                    size);
1072         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1073 out:
1074         return rc;
1075 }
1076
1077 static ssize_t
1078 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1079                   size_t size)
1080 {
1081         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1082                                        value, size);
1083 }
1084
1085 static ssize_t
1086 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1087 {
1088         int rc = 0;
1089         struct dentry *lower_dentry;
1090
1091         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1092         if (!lower_dentry->d_inode->i_op->listxattr) {
1093                 rc = -EOPNOTSUPP;
1094                 goto out;
1095         }
1096         mutex_lock(&lower_dentry->d_inode->i_mutex);
1097         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1098         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1099 out:
1100         return rc;
1101 }
1102
1103 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1104 {
1105         int rc = 0;
1106         struct dentry *lower_dentry;
1107
1108         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1109         if (!lower_dentry->d_inode->i_op->removexattr) {
1110                 rc = -EOPNOTSUPP;
1111                 goto out;
1112         }
1113         mutex_lock(&lower_dentry->d_inode->i_mutex);
1114         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1115         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1116 out:
1117         return rc;
1118 }
1119
1120 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1121 {
1122         if ((ecryptfs_inode_to_lower(inode)
1123              == (struct inode *)candidate_lower_inode))
1124                 return 1;
1125         else
1126                 return 0;
1127 }
1128
1129 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1130 {
1131         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1132         return 0;
1133 }
1134
1135 const struct inode_operations ecryptfs_symlink_iops = {
1136         .readlink = ecryptfs_readlink,
1137         .follow_link = ecryptfs_follow_link,
1138         .put_link = ecryptfs_put_link,
1139         .permission = ecryptfs_permission,
1140         .setattr = ecryptfs_setattr,
1141         .getattr = ecryptfs_getattr_link,
1142         .setxattr = ecryptfs_setxattr,
1143         .getxattr = ecryptfs_getxattr,
1144         .listxattr = ecryptfs_listxattr,
1145         .removexattr = ecryptfs_removexattr
1146 };
1147
1148 const struct inode_operations ecryptfs_dir_iops = {
1149         .create = ecryptfs_create,
1150         .lookup = ecryptfs_lookup,
1151         .link = ecryptfs_link,
1152         .unlink = ecryptfs_unlink,
1153         .symlink = ecryptfs_symlink,
1154         .mkdir = ecryptfs_mkdir,
1155         .rmdir = ecryptfs_rmdir,
1156         .mknod = ecryptfs_mknod,
1157         .rename = ecryptfs_rename,
1158         .permission = ecryptfs_permission,
1159         .setattr = ecryptfs_setattr,
1160         .setxattr = ecryptfs_setxattr,
1161         .getxattr = ecryptfs_getxattr,
1162         .listxattr = ecryptfs_listxattr,
1163         .removexattr = ecryptfs_removexattr
1164 };
1165
1166 const struct inode_operations ecryptfs_main_iops = {
1167         .permission = ecryptfs_permission,
1168         .setattr = ecryptfs_setattr,
1169         .getattr = ecryptfs_getattr,
1170         .setxattr = ecryptfs_setxattr,
1171         .getxattr = ecryptfs_getxattr,
1172         .listxattr = ecryptfs_listxattr,
1173         .removexattr = ecryptfs_removexattr
1174 };