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