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