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