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 <asm/unaligned.h>
  35 #include "ecryptfs_kernel.h"
  36
  37 static struct dentry *lock_parent(struct dentry *dentry)
  38 {
  39         struct dentry *dir;
  40
  41         dir = dget_parent(dentry);
  42         mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
  43         return dir;
  44 }
  45
  46 static void unlock_dir(struct dentry *dir)
  47 {
  48         mutex_unlock(&dir->d_inode->i_mutex);
  49         dput(dir);
  50 }
  51
  52 /**
  53  * ecryptfs_create_underlying_file
  54  * @lower_dir_inode: inode of the parent in the lower fs of the new file
  55  * @dentry: New file's dentry
  56  * @mode: The mode of the new file
  57  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
  58  *
  59  * Creates the file in the lower file system.
  60  *
  61  * Returns zero on success; non-zero on error condition
  62  */
  63 static int
  64 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
  65                                 struct dentry *dentry, int mode,
  66                                 struct nameidata *nd)
  67 {
  68         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
  69         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
  70         struct dentry *dentry_save;
  71         struct vfsmount *vfsmount_save;
  72         unsigned int flags_save;
  73         int rc;
  74
  75         dentry_save = nd->path.dentry;
  76         vfsmount_save = nd->path.mnt;
  77         flags_save = nd->flags;
  78         nd->path.dentry = lower_dentry;
  79         nd->path.mnt = lower_mnt;
  80         nd->flags &= ~LOOKUP_OPEN;
  81         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
  82         nd->path.dentry = dentry_save;
  83         nd->path.mnt = vfsmount_save;
  84         nd->flags = flags_save;
  85         return rc;
  86 }
  87
  88 /**
  89  * ecryptfs_do_create
  90  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
  91  * @ecryptfs_dentry: New file's dentry in ecryptfs
  92  * @mode: The mode of the new file
  93  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
  94  *
  95  * Creates the underlying file and the eCryptfs inode which will link to
  96  * it. It will also update the eCryptfs directory inode to mimic the
  97  * stat of the lower directory inode.
  98  *
  99  * Returns zero on success; non-zero on error condition
 100  */
 101 static int
 102 ecryptfs_do_create(struct inode *directory_inode,
 103                    struct dentry *ecryptfs_dentry, int mode,
 104                    struct nameidata *nd)
 105 {
 106         int rc;
 107         struct dentry *lower_dentry;
 108         struct dentry *lower_dir_dentry;
 109
 110         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 111         lower_dir_dentry = lock_parent(lower_dentry);
 112         if (IS_ERR(lower_dir_dentry)) {
 113                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 114                                 "dentry\n");
 115                 rc = PTR_ERR(lower_dir_dentry);
 116                 goto out;
 117         }
 118         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 119                                              ecryptfs_dentry, mode, nd);
 120         if (rc) {
 121                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 122                        "rc = [%d]\n", __func__, rc);
 123                 goto out_lock;
 124         }
 125         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 126                                 directory_inode->i_sb, 0);
 127         if (rc) {
 128                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 129                 goto out_lock;
 130         }
 131         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 132         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 133 out_lock:
 134         unlock_dir(lower_dir_dentry);
 135 out:
 136         return rc;
 137 }
 138
 139 /**
 140  * grow_file
 141  * @ecryptfs_dentry: the eCryptfs dentry
 142  *
 143  * This is the code which will grow the file to its correct size.
 144  */
 145 static int grow_file(struct dentry *ecryptfs_dentry)
 146 {
 147         struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
 148         struct file fake_file;
 149         struct ecryptfs_file_info tmp_file_info;
 150         char zero_virt[] = { 0x00 };
 151         int rc = 0;
 152
 153         memset(&fake_file, 0, sizeof(fake_file));
 154         fake_file.f_path.dentry = ecryptfs_dentry;
 155         memset(&tmp_file_info, 0, sizeof(tmp_file_info));
 156         ecryptfs_set_file_private(&fake_file, &tmp_file_info);
 157         ecryptfs_set_file_lower(
 158                 &fake_file,
 159                 ecryptfs_inode_to_private(ecryptfs_inode)->lower_file);
 160         rc = ecryptfs_write(&fake_file, zero_virt, 0, 1);
 161         i_size_write(ecryptfs_inode, 0);
 162         rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
 163         ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
 164                 ECRYPTFS_NEW_FILE;
 165         return rc;
 166 }
 167
 168 /**
 169  * ecryptfs_initialize_file
 170  *
 171  * Cause the file to be changed from a basic empty file to an ecryptfs
 172  * file with a header and first data page.
 173  *
 174  * Returns zero on success
 175  */
 176 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 177 {
 178         struct ecryptfs_crypt_stat *crypt_stat =
 179                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 180         int rc = 0;
 181
 182         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 183                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 184                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 185                 goto out;
 186         }
 187         crypt_stat->flags |= ECRYPTFS_NEW_FILE;
 188         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 189         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 190         if (rc) {
 191                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 192                                 "context; rc = [%d]\n", rc);
 193                 goto out;
 194         }
 195         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
 196                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 197                 if (rc) {
 198                         printk(KERN_ERR "%s: Error attempting to initialize "
 199                                "the persistent file for the dentry with name "
 200                                "[%s]; rc = [%d]\n", __func__,
 201                                ecryptfs_dentry->d_name.name, rc);
 202                         goto out;
 203                 }
 204         }
 205         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 206         if (rc) {
 207                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 208                 goto out;
 209         }
 210         rc = grow_file(ecryptfs_dentry);
 211         if (rc)
 212                 printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
 213 out:
 214         return rc;
 215 }
 216
 217 /**
 218  * ecryptfs_create
 219  * @dir: The inode of the directory in which to create the file.
 220  * @dentry: The eCryptfs dentry
 221  * @mode: The mode of the new file.
 222  * @nd: nameidata
 223  *
 224  * Creates a new file.
 225  *
 226  * Returns zero on success; non-zero on error condition
 227  */
 228 static int
 229 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 230                 int mode, struct nameidata *nd)
 231 {
 232         int rc;
 233
 234         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 235         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 236         if (unlikely(rc)) {
 237                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 238                                 "lower filesystem\n");
 239                 goto out;
 240         }
 241         /* At this point, a file exists on "disk"; we need to make sure
 242          * that this on disk file is prepared to be an ecryptfs file */
 243         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 244 out:
 245         return rc;
 246 }
 247
 248 /**
 249  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
 250  */
 251 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 252                                         struct dentry *lower_dentry,
 253                                         struct inode *ecryptfs_dir_inode,
 254                                         struct nameidata *ecryptfs_nd)
 255 {
 256         struct dentry *lower_dir_dentry;
 257         struct vfsmount *lower_mnt;
 258         struct inode *lower_inode;
 259         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 260         struct ecryptfs_crypt_stat *crypt_stat;
 261         char *page_virt = NULL;
 262         u64 file_size;
 263         int rc = 0;
 264
 265         lower_dir_dentry = lower_dentry->d_parent;
 266         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 267                                    ecryptfs_dentry->d_parent));
 268         lower_inode = lower_dentry->d_inode;
 269         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
 270         BUG_ON(!atomic_read(&lower_dentry->d_count));
 271         ecryptfs_set_dentry_private(ecryptfs_dentry,
 272                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
 273                                                      GFP_KERNEL));
 274         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
 275                 rc = -ENOMEM;
 276                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 277                        "to allocate ecryptfs_dentry_info struct\n",
 278                         __func__);
 279                 goto out_dput;
 280         }
 281         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 282         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
 283         if (!lower_dentry->d_inode) {
 284                 /* We want to add because we couldn't find in lower */
 285                 d_add(ecryptfs_dentry, NULL);
 286                 goto out;
 287         }
 288         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 289                                 ecryptfs_dir_inode->i_sb,
 290                                 ECRYPTFS_INTERPOSE_FLAG_D_ADD);
 291         if (rc) {
 292                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
 293                        __func__, rc);
 294                 goto out;
 295         }
 296         if (S_ISDIR(lower_inode->i_mode))
 297                 goto out;
 298         if (S_ISLNK(lower_inode->i_mode))
 299                 goto out;
 300         if (special_file(lower_inode->i_mode))
 301                 goto out;
 302         if (!ecryptfs_nd)
 303                 goto out;
 304         /* Released in this function */
 305         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
 306         if (!page_virt) {
 307                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
 308                        __func__);
 309                 rc = -ENOMEM;
 310                 goto out;
 311         }
 312         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
 313                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 314                 if (rc) {
 315                         printk(KERN_ERR "%s: Error attempting to initialize "
 316                                "the persistent file for the dentry with name "
 317                                "[%s]; rc = [%d]\n", __func__,
 318                                ecryptfs_dentry->d_name.name, rc);
 319                         goto out_free_kmem;
 320                 }
 321         }
 322         crypt_stat = &ecryptfs_inode_to_private(
 323                                         ecryptfs_dentry->d_inode)->crypt_stat;
 324         /* TODO: lock for crypt_stat comparison */
 325         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 326                         ecryptfs_set_default_sizes(crypt_stat);
 327         rc = ecryptfs_read_and_validate_header_region(page_virt,
 328                                                       ecryptfs_dentry->d_inode);
 329         if (rc) {
 330                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 331                                                              ecryptfs_dentry);
 332                 if (rc) {
 333                         rc = 0;
 334                         goto out_free_kmem;
 335                 }
 336                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 337         }
 338         mount_crypt_stat = &ecryptfs_superblock_to_private(
 339                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 340         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
 341                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 342                         file_size = (crypt_stat->num_header_bytes_at_front
 343                                      + i_size_read(lower_dentry->d_inode));
 344                 else
 345                         file_size = i_size_read(lower_dentry->d_inode);
 346         } else {
 347                 file_size = get_unaligned_be64(page_virt);
 348         }
 349         i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
 350 out_free_kmem:
 351         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 352         goto out;
 353 out_dput:
 354         dput(lower_dentry);
 355         d_drop(ecryptfs_dentry);
 356 out:
 357         return rc;
 358 }
 359
 360 /**
 361  * ecryptfs_lookup
 362  * @ecryptfs_dir_inode: The eCryptfs directory inode
 363  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 364  * @ecryptfs_nd: nameidata; may be NULL
 365  *
 366  * Find a file on disk. If the file does not exist, then we'll add it to the
 367  * dentry cache and continue on to read it from the disk.
 368  */
 369 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 370                                       struct dentry *ecryptfs_dentry,
 371                                       struct nameidata *ecryptfs_nd)
 372 {
 373         char *encrypted_and_encoded_name = NULL;
 374         size_t encrypted_and_encoded_name_size;
 375         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 376         struct dentry *lower_dir_dentry, *lower_dentry;
 377         int rc = 0;
 378
 379         ecryptfs_dentry->d_op = &ecryptfs_dops;
 380         if ((ecryptfs_dentry->d_name.len == 1
 381              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 382             || (ecryptfs_dentry->d_name.len == 2
 383                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 384                 goto out_d_drop;
 385         }
 386         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 387         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 388         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 389                                       lower_dir_dentry,
 390                                       ecryptfs_dentry->d_name.len);
 391         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 392         if (IS_ERR(lower_dentry)) {
 393                 rc = PTR_ERR(lower_dentry);
 394                 printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
 395                        "lower_dentry = [%s]\n", __func__, rc,
 396                        ecryptfs_dentry->d_name.name);
 397                 goto out_d_drop;
 398         }
 399         if (lower_dentry->d_inode)
 400                 goto lookup_and_interpose;
 401         mount_crypt_stat = &ecryptfs_superblock_to_private(
 402                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 403         if (!(mount_crypt_stat
 404             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 405                 goto lookup_and_interpose;
 406         dput(lower_dentry);
 407         rc = ecryptfs_encrypt_and_encode_filename(
 408                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 409                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 410                 ecryptfs_dentry->d_name.len);
 411         if (rc) {
 412                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 413                        "filename; rc = [%d]\n", __func__, rc);
 414                 goto out_d_drop;
 415         }
 416         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 417         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 418                                       lower_dir_dentry,
 419                                       encrypted_and_encoded_name_size - 1);
 420         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 421         if (IS_ERR(lower_dentry)) {
 422                 rc = PTR_ERR(lower_dentry);
 423                 printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
 424                        "lower_dentry = [%s]\n", __func__, rc,
 425                        encrypted_and_encoded_name);
 426                 goto out_d_drop;
 427         }
 428 lookup_and_interpose:
 429         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
 430                                                  ecryptfs_dir_inode,
 431                                                  ecryptfs_nd);
 432         goto out;
 433 out_d_drop:
 434         d_drop(ecryptfs_dentry);
 435 out:
 436         kfree(encrypted_and_encoded_name);
 437         return ERR_PTR(rc);
 438 }
 439
 440 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 441                          struct dentry *new_dentry)
 442 {
 443         struct dentry *lower_old_dentry;
 444         struct dentry *lower_new_dentry;
 445         struct dentry *lower_dir_dentry;
 446         u64 file_size_save;
 447         int rc;
 448
 449         file_size_save = i_size_read(old_dentry->d_inode);
 450         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 451         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 452         dget(lower_old_dentry);
 453         dget(lower_new_dentry);
 454         lower_dir_dentry = lock_parent(lower_new_dentry);
 455         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 456                       lower_new_dentry);
 457         if (rc || !lower_new_dentry->d_inode)
 458                 goto out_lock;
 459         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
 460         if (rc)
 461                 goto out_lock;
 462         fsstack_copy_attr_times(dir, lower_new_dentry->d_inode);
 463         fsstack_copy_inode_size(dir, lower_new_dentry->d_inode);
 464         old_dentry->d_inode->i_nlink =
 465                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 466         i_size_write(new_dentry->d_inode, file_size_save);
 467 out_lock:
 468         unlock_dir(lower_dir_dentry);
 469         dput(lower_new_dentry);
 470         dput(lower_old_dentry);
 471         return rc;
 472 }
 473
 474 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 475 {
 476         int rc = 0;
 477         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 478         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 479         struct dentry *lower_dir_dentry;
 480
 481         dget(lower_dentry);
 482         lower_dir_dentry = lock_parent(lower_dentry);
 483         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 484         if (rc) {
 485                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 486                 goto out_unlock;
 487         }
 488         fsstack_copy_attr_times(dir, lower_dir_inode);
 489         dentry->d_inode->i_nlink =
 490                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 491         dentry->d_inode->i_ctime = dir->i_ctime;
 492         d_drop(dentry);
 493 out_unlock:
 494         unlock_dir(lower_dir_dentry);
 495         dput(lower_dentry);
 496         return rc;
 497 }
 498
 499 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 500                             const char *symname)
 501 {
 502         int rc;
 503         struct dentry *lower_dentry;
 504         struct dentry *lower_dir_dentry;
 505         char *encoded_symname;
 506         size_t encoded_symlen;
 507         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 508
 509         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 510         dget(lower_dentry);
 511         lower_dir_dentry = lock_parent(lower_dentry);
 512         mount_crypt_stat = &ecryptfs_superblock_to_private(
 513                 dir->i_sb)->mount_crypt_stat;
 514         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 515                                                   &encoded_symlen,
 516                                                   NULL,
 517                                                   mount_crypt_stat, symname,
 518                                                   strlen(symname));
 519         if (rc)
 520                 goto out_lock;
 521         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 522                          encoded_symname);
 523         kfree(encoded_symname);
 524         if (rc || !lower_dentry->d_inode)
 525                 goto out_lock;
 526         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 527         if (rc)
 528                 goto out_lock;
 529         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 530         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 531 out_lock:
 532         unlock_dir(lower_dir_dentry);
 533         dput(lower_dentry);
 534         if (!dentry->d_inode)
 535                 d_drop(dentry);
 536         return rc;
 537 }
 538
 539 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 540 {
 541         int rc;
 542         struct dentry *lower_dentry;
 543         struct dentry *lower_dir_dentry;
 544
 545         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 546         lower_dir_dentry = lock_parent(lower_dentry);
 547         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 548         if (rc || !lower_dentry->d_inode)
 549                 goto out;
 550         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 551         if (rc)
 552                 goto out;
 553         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 554         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 555         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 556 out:
 557         unlock_dir(lower_dir_dentry);
 558         if (!dentry->d_inode)
 559                 d_drop(dentry);
 560         return rc;
 561 }
 562
 563 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 564 {
 565         struct dentry *lower_dentry;
 566         struct dentry *lower_dir_dentry;
 567         int rc;
 568
 569         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 570         dget(dentry);
 571         lower_dir_dentry = lock_parent(lower_dentry);
 572         dget(lower_dentry);
 573         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 574         dput(lower_dentry);
 575         if (!rc)
 576                 d_delete(lower_dentry);
 577         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 578         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 579         unlock_dir(lower_dir_dentry);
 580         if (!rc)
 581                 d_drop(dentry);
 582         dput(dentry);
 583         return rc;
 584 }
 585
 586 static int
 587 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 588 {
 589         int rc;
 590         struct dentry *lower_dentry;
 591         struct dentry *lower_dir_dentry;
 592
 593         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 594         lower_dir_dentry = lock_parent(lower_dentry);
 595         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 596         if (rc || !lower_dentry->d_inode)
 597                 goto out;
 598         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 599         if (rc)
 600                 goto out;
 601         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 602         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 603 out:
 604         unlock_dir(lower_dir_dentry);
 605         if (!dentry->d_inode)
 606                 d_drop(dentry);
 607         return rc;
 608 }
 609
 610 static int
 611 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 612                 struct inode *new_dir, struct dentry *new_dentry)
 613 {
 614         int rc;
 615         struct dentry *lower_old_dentry;
 616         struct dentry *lower_new_dentry;
 617         struct dentry *lower_old_dir_dentry;
 618         struct dentry *lower_new_dir_dentry;
 619         struct dentry *trap = NULL;
 620
 621         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 622         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 623         dget(lower_old_dentry);
 624         dget(lower_new_dentry);
 625         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 626         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 627         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 628         /* source should not be ancestor of target */
 629         if (trap == lower_old_dentry) {
 630                 rc = -EINVAL;
 631                 goto out_lock;
 632         }
 633         /* target should not be ancestor of source */
 634         if (trap == lower_new_dentry) {
 635                 rc = -ENOTEMPTY;
 636                 goto out_lock;
 637         }
 638         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 639                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 640         if (rc)
 641                 goto out_lock;
 642         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 643         if (new_dir != old_dir)
 644                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 645 out_lock:
 646         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 647         dput(lower_new_dentry->d_parent);
 648         dput(lower_old_dentry->d_parent);
 649         dput(lower_new_dentry);
 650         dput(lower_old_dentry);
 651         return rc;
 652 }
 653
 654 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 655                                    size_t *bufsiz)
 656 {
 657         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 658         char *lower_buf;
 659         size_t lower_bufsiz = PATH_MAX;
 660         mm_segment_t old_fs;
 661         int rc;
 662
 663         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 664         if (!lower_buf) {
 665                 rc = -ENOMEM;
 666                 goto out;
 667         }
 668         old_fs = get_fs();
 669         set_fs(get_ds());
 670         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 671                                                    (char __user *)lower_buf,
 672                                                    lower_bufsiz);
 673         set_fs(old_fs);
 674         if (rc < 0)
 675                 goto out;
 676         lower_bufsiz = rc;
 677         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 678                                                   lower_buf, lower_bufsiz);
 679 out:
 680         kfree(lower_buf);
 681         return rc;
 682 }
 683
 684 static int
 685 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 686 {
 687         char *kbuf;
 688         size_t kbufsiz, copied;
 689         int rc;
 690
 691         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 692         if (rc)
 693                 goto out;
 694         copied = min_t(size_t, bufsiz, kbufsiz);
 695         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 696         kfree(kbuf);
 697         fsstack_copy_attr_atime(dentry->d_inode,
 698                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 699 out:
 700         return rc;
 701 }
 702
 703 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 704 {
 705         char *buf;
 706         int len = PAGE_SIZE, rc;
 707         mm_segment_t old_fs;
 708
 709         /* Released in ecryptfs_put_link(); only release here on error */
 710         buf = kmalloc(len, GFP_KERNEL);
 711         if (!buf) {
 712                 buf = ERR_PTR(-ENOMEM);
 713                 goto out;
 714         }
 715         old_fs = get_fs();
 716         set_fs(get_ds());
 717         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 718         set_fs(old_fs);
 719         if (rc < 0) {
 720                 kfree(buf);
 721                 buf = ERR_PTR(rc);
 722         } else
 723                 buf[rc] = '\0';
 724 out:
 725         nd_set_link(nd, buf);
 726         return NULL;
 727 }
 728
 729 static void
 730 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 731 {
 732         char *buf = nd_get_link(nd);
 733         if (!IS_ERR(buf)) {
 734                 /* Free the char* */
 735                 kfree(buf);
 736         }
 737 }
 738
 739 /**
 740  * upper_size_to_lower_size
 741  * @crypt_stat: Crypt_stat associated with file
 742  * @upper_size: Size of the upper file
 743  *
 744  * Calculate the required size of the lower file based on the
 745  * specified size of the upper file. This calculation is based on the
 746  * number of headers in the underlying file and the extent size.
 747  *
 748  * Returns Calculated size of the lower file.
 749  */
 750 static loff_t
 751 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 752                          loff_t upper_size)
 753 {
 754         loff_t lower_size;
 755
 756         lower_size = crypt_stat->num_header_bytes_at_front;
 757         if (upper_size != 0) {
 758                 loff_t num_extents;
 759
 760                 num_extents = upper_size >> crypt_stat->extent_shift;
 761                 if (upper_size & ~crypt_stat->extent_mask)
 762                         num_extents++;
 763                 lower_size += (num_extents * crypt_stat->extent_size);
 764         }
 765         return lower_size;
 766 }
 767
 768 /**
 769  * truncate_upper
 770  * @dentry: The ecryptfs layer dentry
 771  * @ia: Address of the ecryptfs inode's attributes
 772  * @lower_ia: Address of the lower inode's attributes
 773  *
 774  * Function to handle truncations modifying the size of the file. Note
 775  * that the file sizes are interpolated. When expanding, we are simply
 776  * writing strings of 0's out. When truncating, we truncate the upper
 777  * inode and update the lower_ia according to the page index
 778  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 779  * the caller must use lower_ia in a call to notify_change() to perform
 780  * the truncation of the lower inode.
 781  *
 782  * Returns zero on success; non-zero otherwise
 783  */
 784 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 785                           struct iattr *lower_ia)
 786 {
 787         int rc = 0;
 788         struct inode *inode = dentry->d_inode;
 789         struct dentry *lower_dentry;
 790         struct file fake_ecryptfs_file;
 791         struct ecryptfs_crypt_stat *crypt_stat;
 792         loff_t i_size = i_size_read(inode);
 793         loff_t lower_size_before_truncate;
 794         loff_t lower_size_after_truncate;
 795
 796         if (unlikely((ia->ia_size == i_size))) {
 797                 lower_ia->ia_valid &= ~ATTR_SIZE;
 798                 goto out;
 799         }
 800         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 801         /* Set up a fake ecryptfs file, this is used to interface with
 802          * the file in the underlying filesystem so that the
 803          * truncation has an effect there as well. */
 804         memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file));
 805         fake_ecryptfs_file.f_path.dentry = dentry;
 806         /* Released at out_free: label */
 807         ecryptfs_set_file_private(&fake_ecryptfs_file,
 808                                   kmem_cache_alloc(ecryptfs_file_info_cache,
 809                                                    GFP_KERNEL));
 810         if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) {
 811                 rc = -ENOMEM;
 812                 goto out;
 813         }
 814         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 815         ecryptfs_set_file_lower(
 816                 &fake_ecryptfs_file,
 817                 ecryptfs_inode_to_private(dentry->d_inode)->lower_file);
 818         /* Switch on growing or shrinking file */
 819         if (ia->ia_size > i_size) {
 820                 char zero[] = { 0x00 };
 821
 822                 lower_ia->ia_valid &= ~ATTR_SIZE;
 823                 /* Write a single 0 at the last position of the file;
 824                  * this triggers code that will fill in 0's throughout
 825                  * the intermediate portion of the previous end of the
 826                  * file and the new and of the file */
 827                 rc = ecryptfs_write(&fake_ecryptfs_file, zero,
 828                                     (ia->ia_size - 1), 1);
 829         } else { /* ia->ia_size < i_size_read(inode) */
 830                 /* We're chopping off all the pages down to the page
 831                  * in which ia->ia_size is located. Fill in the end of
 832                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 833                  * PAGE_CACHE_SIZE with zeros. */
 834                 size_t num_zeros = (PAGE_CACHE_SIZE
 835                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 836
 837                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 838                         rc = vmtruncate(inode, ia->ia_size);
 839                         if (rc)
 840                                 goto out_free;
 841                         lower_ia->ia_size = ia->ia_size;
 842                         lower_ia->ia_valid |= ATTR_SIZE;
 843                         goto out_free;
 844                 }
 845                 if (num_zeros) {
 846                         char *zeros_virt;
 847
 848                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 849                         if (!zeros_virt) {
 850                                 rc = -ENOMEM;
 851                                 goto out_free;
 852                         }
 853                         rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt,
 854                                             ia->ia_size, num_zeros);
 855                         kfree(zeros_virt);
 856                         if (rc) {
 857                                 printk(KERN_ERR "Error attempting to zero out "
 858                                        "the remainder of the end page on "
 859                                        "reducing truncate; rc = [%d]\n", rc);
 860                                 goto out_free;
 861                         }
 862                 }
 863                 vmtruncate(inode, ia->ia_size);
 864                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 865                 if (rc) {
 866                         printk(KERN_ERR "Problem with "
 867                                "ecryptfs_write_inode_size_to_metadata; "
 868                                "rc = [%d]\n", rc);
 869                         goto out_free;
 870                 }
 871                 /* We are reducing the size of the ecryptfs file, and need to
 872                  * know if we need to reduce the size of the lower file. */
 873                 lower_size_before_truncate =
 874                     upper_size_to_lower_size(crypt_stat, i_size);
 875                 lower_size_after_truncate =
 876                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 877                 if (lower_size_after_truncate < lower_size_before_truncate) {
 878                         lower_ia->ia_size = lower_size_after_truncate;
 879                         lower_ia->ia_valid |= ATTR_SIZE;
 880                 } else
 881                         lower_ia->ia_valid &= ~ATTR_SIZE;
 882         }
 883 out_free:
 884         if (ecryptfs_file_to_private(&fake_ecryptfs_file))
 885                 kmem_cache_free(ecryptfs_file_info_cache,
 886                                 ecryptfs_file_to_private(&fake_ecryptfs_file));
 887 out:
 888         return rc;
 889 }
 890
 891 /**
 892  * ecryptfs_truncate
 893  * @dentry: The ecryptfs layer dentry
 894  * @new_length: The length to expand the file to
 895  *
 896  * Simple function that handles the truncation of an eCryptfs inode and
 897  * its corresponding lower inode.
 898  *
 899  * Returns zero on success; non-zero otherwise
 900  */
 901 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 902 {
 903         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 904         struct iattr lower_ia = { .ia_valid = 0 };
 905         int rc;
 906
 907         rc = truncate_upper(dentry, &ia, &lower_ia);
 908         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 909                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 910
 911                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 912                 rc = notify_change(lower_dentry, &lower_ia);
 913                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 914         }
 915         return rc;
 916 }
 917
 918 static int
 919 ecryptfs_permission(struct inode *inode, int mask)
 920 {
 921         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 922 }
 923
 924 /**
 925  * ecryptfs_setattr
 926  * @dentry: dentry handle to the inode to modify
 927  * @ia: Structure with flags of what to change and values
 928  *
 929  * Updates the metadata of an inode. If the update is to the size
 930  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 931  * of both the ecryptfs inode and the lower inode.
 932  *
 933  * All other metadata changes will be passed right to the lower filesystem,
 934  * and we will just update our inode to look like the lower.
 935  */
 936 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 937 {
 938         int rc = 0;
 939         struct dentry *lower_dentry;
 940         struct iattr lower_ia;
 941         struct inode *inode;
 942         struct inode *lower_inode;
 943         struct ecryptfs_crypt_stat *crypt_stat;
 944
 945         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 946         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 947                 ecryptfs_init_crypt_stat(crypt_stat);
 948         inode = dentry->d_inode;
 949         lower_inode = ecryptfs_inode_to_lower(inode);
 950         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 951         mutex_lock(&crypt_stat->cs_mutex);
 952         if (S_ISDIR(dentry->d_inode->i_mode))
 953                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 954         else if (S_ISREG(dentry->d_inode->i_mode)
 955                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 956                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 957                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 958
 959                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 960                         dentry->d_sb)->mount_crypt_stat;
 961                 rc = ecryptfs_read_metadata(dentry);
 962                 if (rc) {
 963                         if (!(mount_crypt_stat->flags
 964                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 965                                 rc = -EIO;
 966                                 printk(KERN_WARNING "Either the lower file "
 967                                        "is not in a valid eCryptfs format, "
 968                                        "or the key could not be retrieved. "
 969                                        "Plaintext passthrough mode is not "
 970                                        "enabled; returning -EIO\n");
 971                                 mutex_unlock(&crypt_stat->cs_mutex);
 972                                 goto out;
 973                         }
 974                         rc = 0;
 975                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 976                 }
 977         }
 978         mutex_unlock(&crypt_stat->cs_mutex);
 979         memcpy(&lower_ia, ia, sizeof(lower_ia));
 980         if (ia->ia_valid & ATTR_FILE)
 981                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 982         if (ia->ia_valid & ATTR_SIZE) {
 983                 rc = truncate_upper(dentry, ia, &lower_ia);
 984                 if (rc < 0)
 985                         goto out;
 986         }
 987
 988         /*
 989          * mode change is for clearing setuid/setgid bits. Allow lower fs
 990          * to interpret this in its own way.
 991          */
 992         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
 993                 lower_ia.ia_valid &= ~ATTR_MODE;
 994
 995         mutex_lock(&lower_dentry->d_inode->i_mutex);
 996         rc = notify_change(lower_dentry, &lower_ia);
 997         mutex_unlock(&lower_dentry->d_inode->i_mutex);
 998 out:
 999         fsstack_copy_attr_all(inode, lower_inode);
1000         return rc;
1001 }
1002
1003 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1004                           struct kstat *stat)
1005 {
1006         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1007         int rc = 0;
1008
1009         mount_crypt_stat = &ecryptfs_superblock_to_private(
1010                                                 dentry->d_sb)->mount_crypt_stat;
1011         generic_fillattr(dentry->d_inode, stat);
1012         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1013                 char *target;
1014                 size_t targetsiz;
1015
1016                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1017                 if (!rc) {
1018                         kfree(target);
1019                         stat->size = targetsiz;
1020                 }
1021         }
1022         return rc;
1023 }
1024
1025 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1026                      struct kstat *stat)
1027 {
1028         struct kstat lower_stat;
1029         int rc;
1030
1031         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1032                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1033         if (!rc) {
1034                 generic_fillattr(dentry->d_inode, stat);
1035                 stat->blocks = lower_stat.blocks;
1036         }
1037         return rc;
1038 }
1039
1040 int
1041 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1042                   size_t size, int flags)
1043 {
1044         int rc = 0;
1045         struct dentry *lower_dentry;
1046
1047         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1048         if (!lower_dentry->d_inode->i_op->setxattr) {
1049                 rc = -EOPNOTSUPP;
1050                 goto out;
1051         }
1052         mutex_lock(&lower_dentry->d_inode->i_mutex);
1053         rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
1054                                                    size, flags);
1055         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1056 out:
1057         return rc;
1058 }
1059
1060 ssize_t
1061 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1062                         void *value, size_t size)
1063 {
1064         int rc = 0;
1065
1066         if (!lower_dentry->d_inode->i_op->getxattr) {
1067                 rc = -EOPNOTSUPP;
1068                 goto out;
1069         }
1070         mutex_lock(&lower_dentry->d_inode->i_mutex);
1071         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1072                                                    size);
1073         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1074 out:
1075         return rc;
1076 }
1077
1078 static ssize_t
1079 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1080                   size_t size)
1081 {
1082         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1083                                        value, size);
1084 }
1085
1086 static ssize_t
1087 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1088 {
1089         int rc = 0;
1090         struct dentry *lower_dentry;
1091
1092         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1093         if (!lower_dentry->d_inode->i_op->listxattr) {
1094                 rc = -EOPNOTSUPP;
1095                 goto out;
1096         }
1097         mutex_lock(&lower_dentry->d_inode->i_mutex);
1098         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1099         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1100 out:
1101         return rc;
1102 }
1103
1104 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1105 {
1106         int rc = 0;
1107         struct dentry *lower_dentry;
1108
1109         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1110         if (!lower_dentry->d_inode->i_op->removexattr) {
1111                 rc = -EOPNOTSUPP;
1112                 goto out;
1113         }
1114         mutex_lock(&lower_dentry->d_inode->i_mutex);
1115         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1116         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1117 out:
1118         return rc;
1119 }
1120
1121 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1122 {
1123         if ((ecryptfs_inode_to_lower(inode)
1124              == (struct inode *)candidate_lower_inode))
1125                 return 1;
1126         else
1127                 return 0;
1128 }
1129
1130 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1131 {
1132         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1133         return 0;
1134 }
1135
1136 const struct inode_operations ecryptfs_symlink_iops = {
1137         .readlink = ecryptfs_readlink,
1138         .follow_link = ecryptfs_follow_link,
1139         .put_link = ecryptfs_put_link,
1140         .permission = ecryptfs_permission,
1141         .setattr = ecryptfs_setattr,
1142         .getattr = ecryptfs_getattr_link,
1143         .setxattr = ecryptfs_setxattr,
1144         .getxattr = ecryptfs_getxattr,
1145         .listxattr = ecryptfs_listxattr,
1146         .removexattr = ecryptfs_removexattr
1147 };
1148
1149 const struct inode_operations ecryptfs_dir_iops = {
1150         .create = ecryptfs_create,
1151         .lookup = ecryptfs_lookup,
1152         .link = ecryptfs_link,
1153         .unlink = ecryptfs_unlink,
1154         .symlink = ecryptfs_symlink,
1155         .mkdir = ecryptfs_mkdir,
1156         .rmdir = ecryptfs_rmdir,
1157         .mknod = ecryptfs_mknod,
1158         .rename = ecryptfs_rename,
1159         .permission = ecryptfs_permission,
1160         .setattr = ecryptfs_setattr,
1161         .setxattr = ecryptfs_setxattr,
1162         .getxattr = ecryptfs_getxattr,
1163         .listxattr = ecryptfs_listxattr,
1164         .removexattr = ecryptfs_removexattr
1165 };
1166
1167 const struct inode_operations ecryptfs_main_iops = {
1168         .permission = ecryptfs_permission,
1169         .setattr = ecryptfs_setattr,
1170         .getattr = ecryptfs_getattr,
1171         .setxattr = ecryptfs_setxattr,
1172         .getxattr = ecryptfs_getxattr,
1173         .listxattr = ecryptfs_listxattr,
1174         .removexattr = ecryptfs_removexattr
1175 };