fs/ecryptfs/inode.c

   1 /**
   2  * eCryptfs: Linux filesystem encryption layer
   3  *
   4  * Copyright (C) 1997-2004 Erez Zadok
   5  * Copyright (C) 2001-2004 Stony Brook University
   6  * Copyright (C) 2004-2007 International Business Machines Corp.
   7  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
   8  *              Michael C. Thompsion <mcthomps@us.ibm.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of the
  13  * License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  23  * 02111-1307, USA.
  24  */
  25
  26 #include <linux/file.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/pagemap.h>
  29 #include <linux/dcache.h>
  30 #include <linux/namei.h>
  31 #include <linux/mount.h>
  32 #include <linux/crypto.h>
  33 #include <linux/fs_stack.h>
  34 #include <linux/slab.h>
  35 #include <linux/xattr.h>
  36 #include <asm/unaligned.h>
  37 #include "ecryptfs_kernel.h"
  38
  39 static struct dentry *lock_parent(struct dentry *dentry)
  40 {
  41         struct dentry *dir;
  42
  43         dir = dget_parent(dentry);
  44         mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
  45         return dir;
  46 }
  47
  48 static void unlock_dir(struct dentry *dir)
  49 {
  50         mutex_unlock(&dir->d_inode->i_mutex);
  51         dput(dir);
  52 }
  53
  54 static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
  55 {
  56         if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode)
  57                 return 1;
  58         return 0;
  59 }
  60
  61 static int ecryptfs_inode_set(struct inode *inode, void *opaque)
  62 {
  63         struct inode *lower_inode = opaque;
  64
  65         ecryptfs_set_inode_lower(inode, lower_inode);
  66         fsstack_copy_attr_all(inode, lower_inode);
  67         /* i_size will be overwritten for encrypted regular files */
  68         fsstack_copy_inode_size(inode, lower_inode);
  69         inode->i_ino = lower_inode->i_ino;
  70         inode->i_version++;
  71         inode->i_mapping->a_ops = &ecryptfs_aops;
  72
  73         if (S_ISLNK(inode->i_mode))
  74                 inode->i_op = &ecryptfs_symlink_iops;
  75         else if (S_ISDIR(inode->i_mode))
  76                 inode->i_op = &ecryptfs_dir_iops;
  77         else
  78                 inode->i_op = &ecryptfs_main_iops;
  79
  80         if (S_ISDIR(inode->i_mode))
  81                 inode->i_fop = &ecryptfs_dir_fops;
  82         else if (special_file(inode->i_mode))
  83                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  84         else
  85                 inode->i_fop = &ecryptfs_main_fops;
  86
  87         return 0;
  88 }
  89
  90 static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
  91                                           struct super_block *sb)
  92 {
  93         struct inode *inode;
  94
  95         if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
  96                 return ERR_PTR(-EXDEV);
  97         if (!igrab(lower_inode))
  98                 return ERR_PTR(-ESTALE);
  99         inode = iget5_locked(sb, (unsigned long)lower_inode,
 100                              ecryptfs_inode_test, ecryptfs_inode_set,
 101                              lower_inode);
 102         if (!inode) {
 103                 iput(lower_inode);
 104                 return ERR_PTR(-EACCES);
 105         }
 106         if (!(inode->i_state & I_NEW))
 107                 iput(lower_inode);
 108
 109         return inode;
 110 }
 111
 112 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 113                                  struct super_block *sb)
 114 {
 115         struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
 116
 117         if (!IS_ERR(inode) && (inode->i_state & I_NEW))
 118                 unlock_new_inode(inode);
 119
 120         return inode;
 121 }
 122
 123 /**
 124  * ecryptfs_interpose
 125  * @lower_dentry: Existing dentry in the lower filesystem
 126  * @dentry: ecryptfs' dentry
 127  * @sb: ecryptfs's super_block
 128  *
 129  * Interposes upper and lower dentries.
 130  *
 131  * Returns zero on success; non-zero otherwise
 132  */
 133 static int ecryptfs_interpose(struct dentry *lower_dentry,
 134                               struct dentry *dentry, struct super_block *sb)
 135 {
 136         struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb);
 137
 138         if (IS_ERR(inode))
 139                 return PTR_ERR(inode);
 140         d_instantiate(dentry, inode);
 141
 142         return 0;
 143 }
 144
 145 /**
 146  * ecryptfs_create_underlying_file
 147  * @lower_dir_inode: inode of the parent in the lower fs of the new file
 148  * @dentry: New file's dentry
 149  * @mode: The mode of the new file
 150  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 151  *
 152  * Creates the file in the lower file system.
 153  *
 154  * Returns zero on success; non-zero on error condition
 155  */
 156 static int
 157 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
 158                                 struct dentry *dentry, int mode,
 159                                 struct nameidata *nd)
 160 {
 161         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 162         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
 163         struct dentry *dentry_save;
 164         struct vfsmount *vfsmount_save;
 165         unsigned int flags_save;
 166         int rc;
 167
 168         if (nd) {
 169                 dentry_save = nd->path.dentry;
 170                 vfsmount_save = nd->path.mnt;
 171                 flags_save = nd->flags;
 172                 nd->path.dentry = lower_dentry;
 173                 nd->path.mnt = lower_mnt;
 174                 nd->flags &= ~LOOKUP_OPEN;
 175         }
 176         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
 177         if (nd) {
 178                 nd->path.dentry = dentry_save;
 179                 nd->path.mnt = vfsmount_save;
 180                 nd->flags = flags_save;
 181         }
 182         return rc;
 183 }
 184
 185 /**
 186  * ecryptfs_do_create
 187  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
 188  * @ecryptfs_dentry: New file's dentry in ecryptfs
 189  * @mode: The mode of the new file
 190  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 191  *
 192  * Creates the underlying file and the eCryptfs inode which will link to
 193  * it. It will also update the eCryptfs directory inode to mimic the
 194  * stat of the lower directory inode.
 195  *
 196  * Returns zero on success; non-zero on error condition
 197  */
 198 static int
 199 ecryptfs_do_create(struct inode *directory_inode,
 200                    struct dentry *ecryptfs_dentry, int mode,
 201                    struct nameidata *nd)
 202 {
 203         int rc;
 204         struct dentry *lower_dentry;
 205         struct dentry *lower_dir_dentry;
 206
 207         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 208         lower_dir_dentry = lock_parent(lower_dentry);
 209         if (IS_ERR(lower_dir_dentry)) {
 210                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 211                                 "dentry\n");
 212                 rc = PTR_ERR(lower_dir_dentry);
 213                 goto out;
 214         }
 215         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 216                                              ecryptfs_dentry, mode, nd);
 217         if (rc) {
 218                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 219                        "rc = [%d]\n", __func__, rc);
 220                 goto out_lock;
 221         }
 222         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 223                                 directory_inode->i_sb);
 224         if (rc) {
 225                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 226                 goto out_lock;
 227         }
 228         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 229         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 230 out_lock:
 231         unlock_dir(lower_dir_dentry);
 232 out:
 233         return rc;
 234 }
 235
 236 /**
 237  * ecryptfs_initialize_file
 238  *
 239  * Cause the file to be changed from a basic empty file to an ecryptfs
 240  * file with a header and first data page.
 241  *
 242  * Returns zero on success
 243  */
 244 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 245 {
 246         struct ecryptfs_crypt_stat *crypt_stat =
 247                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 248         int rc = 0;
 249
 250         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 251                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 252                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 253                 goto out;
 254         }
 255         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 256         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 257         if (rc) {
 258                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 259                                 "context; rc = [%d]\n", rc);
 260                 goto out;
 261         }
 262         rc = ecryptfs_get_lower_file(ecryptfs_dentry,
 263                                      ecryptfs_dentry->d_inode);
 264         if (rc) {
 265                 printk(KERN_ERR "%s: Error attempting to initialize "
 266                         "the lower file for the dentry with name "
 267                         "[%s]; rc = [%d]\n", __func__,
 268                         ecryptfs_dentry->d_name.name, rc);
 269                 goto out;
 270         }
 271         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 272         if (rc)
 273                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 274         ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 275 out:
 276         return rc;
 277 }
 278
 279 /**
 280  * ecryptfs_create
 281  * @dir: The inode of the directory in which to create the file.
 282  * @dentry: The eCryptfs dentry
 283  * @mode: The mode of the new file.
 284  * @nd: nameidata
 285  *
 286  * Creates a new file.
 287  *
 288  * Returns zero on success; non-zero on error condition
 289  */
 290 static int
 291 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 292                 int mode, struct nameidata *nd)
 293 {
 294         int rc;
 295
 296         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 297         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 298         if (unlikely(rc)) {
 299                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 300                                 "lower filesystem\n");
 301                 goto out;
 302         }
 303         /* At this point, a file exists on "disk"; we need to make sure
 304          * that this on disk file is prepared to be an ecryptfs file */
 305         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 306 out:
 307         return rc;
 308 }
 309
 310 static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
 311 {
 312         struct ecryptfs_crypt_stat *crypt_stat;
 313         int rc;
 314
 315         rc = ecryptfs_get_lower_file(dentry, inode);
 316         if (rc) {
 317                 printk(KERN_ERR "%s: Error attempting to initialize "
 318                         "the lower file for the dentry with name "
 319                         "[%s]; rc = [%d]\n", __func__,
 320                         dentry->d_name.name, rc);
 321                 return rc;
 322         }
 323
 324         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 325         /* TODO: lock for crypt_stat comparison */
 326         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 327                 ecryptfs_set_default_sizes(crypt_stat);
 328
 329         rc = ecryptfs_read_and_validate_header_region(inode);
 330         ecryptfs_put_lower_file(inode);
 331         if (rc) {
 332                 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
 333                 if (!rc)
 334                         crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 335         }
 336
 337         /* Must return 0 to allow non-eCryptfs files to be looked up, too */
 338         return 0;
 339 }
 340
 341 /**
 342  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
 343  */
 344 static int ecryptfs_lookup_interpose(struct dentry *dentry,
 345                                      struct dentry *lower_dentry,
 346                                      struct inode *dir_inode)
 347 {
 348         struct inode *inode, *lower_inode = lower_dentry->d_inode;
 349         struct ecryptfs_dentry_info *dentry_info;
 350         struct vfsmount *lower_mnt;
 351         int rc = 0;
 352
 353         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
 354         fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode);
 355         BUG_ON(!lower_dentry->d_count);
 356
 357         dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
 358         ecryptfs_set_dentry_private(dentry, dentry_info);
 359         if (!dentry_info) {
 360                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 361                        "to allocate ecryptfs_dentry_info struct\n",
 362                         __func__);
 363                 dput(lower_dentry);
 364                 mntput(lower_mnt);
 365                 d_drop(dentry);
 366                 return -ENOMEM;
 367         }
 368         ecryptfs_set_dentry_lower(dentry, lower_dentry);
 369         ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
 370
 371         if (!lower_dentry->d_inode) {
 372                 /* We want to add because we couldn't find in lower */
 373                 d_add(dentry, NULL);
 374                 return 0;
 375         }
 376         inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
 377         if (IS_ERR(inode)) {
 378                 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
 379                        __func__, PTR_ERR(inode));
 380                 return PTR_ERR(inode);
 381         }
 382         if (S_ISREG(inode->i_mode)) {
 383                 rc = ecryptfs_i_size_read(dentry, inode);
 384                 if (rc) {
 385                         make_bad_inode(inode);
 386                         return rc;
 387                 }
 388         }
 389
 390         if (inode->i_state & I_NEW)
 391                 unlock_new_inode(inode);
 392         d_add(dentry, inode);
 393
 394         return rc;
 395 }
 396
 397 /**
 398  * ecryptfs_lookup
 399  * @ecryptfs_dir_inode: The eCryptfs directory inode
 400  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 401  * @ecryptfs_nd: nameidata; may be NULL
 402  *
 403  * Find a file on disk. If the file does not exist, then we'll add it to the
 404  * dentry cache and continue on to read it from the disk.
 405  */
 406 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 407                                       struct dentry *ecryptfs_dentry,
 408                                       struct nameidata *ecryptfs_nd)
 409 {
 410         char *encrypted_and_encoded_name = NULL;
 411         size_t encrypted_and_encoded_name_size;
 412         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 413         struct dentry *lower_dir_dentry, *lower_dentry;
 414         int rc = 0;
 415
 416         if ((ecryptfs_dentry->d_name.len == 1
 417              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 418             || (ecryptfs_dentry->d_name.len == 2
 419                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 420                 goto out_d_drop;
 421         }
 422         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 423         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 424         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 425                                       lower_dir_dentry,
 426                                       ecryptfs_dentry->d_name.len);
 427         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 428         if (IS_ERR(lower_dentry)) {
 429                 rc = PTR_ERR(lower_dentry);
 430                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 431                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 432                                 encrypted_and_encoded_name);
 433                 goto out_d_drop;
 434         }
 435         if (lower_dentry->d_inode)
 436                 goto interpose;
 437         mount_crypt_stat = &ecryptfs_superblock_to_private(
 438                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 439         if (!(mount_crypt_stat
 440             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 441                 goto interpose;
 442         dput(lower_dentry);
 443         rc = ecryptfs_encrypt_and_encode_filename(
 444                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 445                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 446                 ecryptfs_dentry->d_name.len);
 447         if (rc) {
 448                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 449                        "filename; rc = [%d]\n", __func__, rc);
 450                 goto out_d_drop;
 451         }
 452         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 453         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 454                                       lower_dir_dentry,
 455                                       encrypted_and_encoded_name_size);
 456         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 457         if (IS_ERR(lower_dentry)) {
 458                 rc = PTR_ERR(lower_dentry);
 459                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 460                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 461                                 encrypted_and_encoded_name);
 462                 goto out_d_drop;
 463         }
 464 interpose:
 465         rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
 466                                        ecryptfs_dir_inode);
 467         goto out;
 468 out_d_drop:
 469         d_drop(ecryptfs_dentry);
 470 out:
 471         kfree(encrypted_and_encoded_name);
 472         return ERR_PTR(rc);
 473 }
 474
 475 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 476                          struct dentry *new_dentry)
 477 {
 478         struct dentry *lower_old_dentry;
 479         struct dentry *lower_new_dentry;
 480         struct dentry *lower_dir_dentry;
 481         u64 file_size_save;
 482         int rc;
 483
 484         file_size_save = i_size_read(old_dentry->d_inode);
 485         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 486         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 487         dget(lower_old_dentry);
 488         dget(lower_new_dentry);
 489         lower_dir_dentry = lock_parent(lower_new_dentry);
 490         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 491                       lower_new_dentry);
 492         if (rc || !lower_new_dentry->d_inode)
 493                 goto out_lock;
 494         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
 495         if (rc)
 496                 goto out_lock;
 497         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 498         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 499         old_dentry->d_inode->i_nlink =
 500                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 501         i_size_write(new_dentry->d_inode, file_size_save);
 502 out_lock:
 503         unlock_dir(lower_dir_dentry);
 504         dput(lower_new_dentry);
 505         dput(lower_old_dentry);
 506         return rc;
 507 }
 508
 509 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 510 {
 511         int rc = 0;
 512         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 513         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 514         struct dentry *lower_dir_dentry;
 515
 516         dget(lower_dentry);
 517         lower_dir_dentry = lock_parent(lower_dentry);
 518         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 519         if (rc) {
 520                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 521                 goto out_unlock;
 522         }
 523         fsstack_copy_attr_times(dir, lower_dir_inode);
 524         dentry->d_inode->i_nlink =
 525                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 526         dentry->d_inode->i_ctime = dir->i_ctime;
 527         d_drop(dentry);
 528 out_unlock:
 529         unlock_dir(lower_dir_dentry);
 530         dput(lower_dentry);
 531         return rc;
 532 }
 533
 534 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 535                             const char *symname)
 536 {
 537         int rc;
 538         struct dentry *lower_dentry;
 539         struct dentry *lower_dir_dentry;
 540         char *encoded_symname;
 541         size_t encoded_symlen;
 542         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 543
 544         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 545         dget(lower_dentry);
 546         lower_dir_dentry = lock_parent(lower_dentry);
 547         mount_crypt_stat = &ecryptfs_superblock_to_private(
 548                 dir->i_sb)->mount_crypt_stat;
 549         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 550                                                   &encoded_symlen,
 551                                                   NULL,
 552                                                   mount_crypt_stat, symname,
 553                                                   strlen(symname));
 554         if (rc)
 555                 goto out_lock;
 556         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 557                          encoded_symname);
 558         kfree(encoded_symname);
 559         if (rc || !lower_dentry->d_inode)
 560                 goto out_lock;
 561         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 562         if (rc)
 563                 goto out_lock;
 564         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 565         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 566 out_lock:
 567         unlock_dir(lower_dir_dentry);
 568         dput(lower_dentry);
 569         if (!dentry->d_inode)
 570                 d_drop(dentry);
 571         return rc;
 572 }
 573
 574 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 575 {
 576         int rc;
 577         struct dentry *lower_dentry;
 578         struct dentry *lower_dir_dentry;
 579
 580         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 581         lower_dir_dentry = lock_parent(lower_dentry);
 582         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 583         if (rc || !lower_dentry->d_inode)
 584                 goto out;
 585         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 586         if (rc)
 587                 goto out;
 588         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 589         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 590         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 591 out:
 592         unlock_dir(lower_dir_dentry);
 593         if (!dentry->d_inode)
 594                 d_drop(dentry);
 595         return rc;
 596 }
 597
 598 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 599 {
 600         struct dentry *lower_dentry;
 601         struct dentry *lower_dir_dentry;
 602         int rc;
 603
 604         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 605         dget(dentry);
 606         lower_dir_dentry = lock_parent(lower_dentry);
 607         dget(lower_dentry);
 608         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 609         dput(lower_dentry);
 610         if (!rc && dentry->d_inode)
 611                 clear_nlink(dentry->d_inode);
 612         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 613         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 614         unlock_dir(lower_dir_dentry);
 615         if (!rc)
 616                 d_drop(dentry);
 617         dput(dentry);
 618         return rc;
 619 }
 620
 621 static int
 622 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 623 {
 624         int rc;
 625         struct dentry *lower_dentry;
 626         struct dentry *lower_dir_dentry;
 627
 628         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 629         lower_dir_dentry = lock_parent(lower_dentry);
 630         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 631         if (rc || !lower_dentry->d_inode)
 632                 goto out;
 633         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 634         if (rc)
 635                 goto out;
 636         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 637         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 638 out:
 639         unlock_dir(lower_dir_dentry);
 640         if (!dentry->d_inode)
 641                 d_drop(dentry);
 642         return rc;
 643 }
 644
 645 static int
 646 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 647                 struct inode *new_dir, struct dentry *new_dentry)
 648 {
 649         int rc;
 650         struct dentry *lower_old_dentry;
 651         struct dentry *lower_new_dentry;
 652         struct dentry *lower_old_dir_dentry;
 653         struct dentry *lower_new_dir_dentry;
 654         struct dentry *trap = NULL;
 655
 656         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 657         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 658         dget(lower_old_dentry);
 659         dget(lower_new_dentry);
 660         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 661         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 662         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 663         /* source should not be ancestor of target */
 664         if (trap == lower_old_dentry) {
 665                 rc = -EINVAL;
 666                 goto out_lock;
 667         }
 668         /* target should not be ancestor of source */
 669         if (trap == lower_new_dentry) {
 670                 rc = -ENOTEMPTY;
 671                 goto out_lock;
 672         }
 673         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 674                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 675         if (rc)
 676                 goto out_lock;
 677         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 678         if (new_dir != old_dir)
 679                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 680 out_lock:
 681         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 682         dput(lower_new_dir_dentry);
 683         dput(lower_old_dir_dentry);
 684         dput(lower_new_dentry);
 685         dput(lower_old_dentry);
 686         return rc;
 687 }
 688
 689 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 690                                    size_t *bufsiz)
 691 {
 692         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 693         char *lower_buf;
 694         size_t lower_bufsiz = PATH_MAX;
 695         mm_segment_t old_fs;
 696         int rc;
 697
 698         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 699         if (!lower_buf) {
 700                 rc = -ENOMEM;
 701                 goto out;
 702         }
 703         old_fs = get_fs();
 704         set_fs(get_ds());
 705         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 706                                                    (char __user *)lower_buf,
 707                                                    lower_bufsiz);
 708         set_fs(old_fs);
 709         if (rc < 0)
 710                 goto out;
 711         lower_bufsiz = rc;
 712         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 713                                                   lower_buf, lower_bufsiz);
 714 out:
 715         kfree(lower_buf);
 716         return rc;
 717 }
 718
 719 static int
 720 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 721 {
 722         char *kbuf;
 723         size_t kbufsiz, copied;
 724         int rc;
 725
 726         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 727         if (rc)
 728                 goto out;
 729         copied = min_t(size_t, bufsiz, kbufsiz);
 730         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 731         kfree(kbuf);
 732         fsstack_copy_attr_atime(dentry->d_inode,
 733                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 734 out:
 735         return rc;
 736 }
 737
 738 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 739 {
 740         char *buf;
 741         int len = PAGE_SIZE, rc;
 742         mm_segment_t old_fs;
 743
 744         /* Released in ecryptfs_put_link(); only release here on error */
 745         buf = kmalloc(len, GFP_KERNEL);
 746         if (!buf) {
 747                 buf = ERR_PTR(-ENOMEM);
 748                 goto out;
 749         }
 750         old_fs = get_fs();
 751         set_fs(get_ds());
 752         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 753         set_fs(old_fs);
 754         if (rc < 0) {
 755                 kfree(buf);
 756                 buf = ERR_PTR(rc);
 757         } else
 758                 buf[rc] = '\0';
 759 out:
 760         nd_set_link(nd, buf);
 761         return NULL;
 762 }
 763
 764 static void
 765 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 766 {
 767         char *buf = nd_get_link(nd);
 768         if (!IS_ERR(buf)) {
 769                 /* Free the char* */
 770                 kfree(buf);
 771         }
 772 }
 773
 774 /**
 775  * upper_size_to_lower_size
 776  * @crypt_stat: Crypt_stat associated with file
 777  * @upper_size: Size of the upper file
 778  *
 779  * Calculate the required size of the lower file based on the
 780  * specified size of the upper file. This calculation is based on the
 781  * number of headers in the underlying file and the extent size.
 782  *
 783  * Returns Calculated size of the lower file.
 784  */
 785 static loff_t
 786 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 787                          loff_t upper_size)
 788 {
 789         loff_t lower_size;
 790
 791         lower_size = ecryptfs_lower_header_size(crypt_stat);
 792         if (upper_size != 0) {
 793                 loff_t num_extents;
 794
 795                 num_extents = upper_size >> crypt_stat->extent_shift;
 796                 if (upper_size & ~crypt_stat->extent_mask)
 797                         num_extents++;
 798                 lower_size += (num_extents * crypt_stat->extent_size);
 799         }
 800         return lower_size;
 801 }
 802
 803 /**
 804  * truncate_upper
 805  * @dentry: The ecryptfs layer dentry
 806  * @ia: Address of the ecryptfs inode's attributes
 807  * @lower_ia: Address of the lower inode's attributes
 808  *
 809  * Function to handle truncations modifying the size of the file. Note
 810  * that the file sizes are interpolated. When expanding, we are simply
 811  * writing strings of 0's out. When truncating, we truncate the upper
 812  * inode and update the lower_ia according to the page index
 813  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 814  * the caller must use lower_ia in a call to notify_change() to perform
 815  * the truncation of the lower inode.
 816  *
 817  * Returns zero on success; non-zero otherwise
 818  */
 819 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 820                           struct iattr *lower_ia)
 821 {
 822         int rc = 0;
 823         struct inode *inode = dentry->d_inode;
 824         struct ecryptfs_crypt_stat *crypt_stat;
 825         loff_t i_size = i_size_read(inode);
 826         loff_t lower_size_before_truncate;
 827         loff_t lower_size_after_truncate;
 828
 829         if (unlikely((ia->ia_size == i_size))) {
 830                 lower_ia->ia_valid &= ~ATTR_SIZE;
 831                 return 0;
 832         }
 833         rc = ecryptfs_get_lower_file(dentry, inode);
 834         if (rc)
 835                 return rc;
 836         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 837         /* Switch on growing or shrinking file */
 838         if (ia->ia_size > i_size) {
 839                 char zero[] = { 0x00 };
 840
 841                 lower_ia->ia_valid &= ~ATTR_SIZE;
 842                 /* Write a single 0 at the last position of the file;
 843                  * this triggers code that will fill in 0's throughout
 844                  * the intermediate portion of the previous end of the
 845                  * file and the new and of the file */
 846                 rc = ecryptfs_write(inode, zero,
 847                                     (ia->ia_size - 1), 1);
 848         } else { /* ia->ia_size < i_size_read(inode) */
 849                 /* We're chopping off all the pages down to the page
 850                  * in which ia->ia_size is located. Fill in the end of
 851                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 852                  * PAGE_CACHE_SIZE with zeros. */
 853                 size_t num_zeros = (PAGE_CACHE_SIZE
 854                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 855
 856
 857                 /*
 858                  * XXX(truncate) this should really happen at the begginning
 859                  * of ->setattr.  But the code is too messy to that as part
 860                  * of a larger patch.  ecryptfs is also totally missing out
 861                  * on the inode_change_ok check at the beginning of
 862                  * ->setattr while would include this.
 863                  */
 864                 rc = inode_newsize_ok(inode, ia->ia_size);
 865                 if (rc)
 866                         goto out;
 867
 868                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 869                         truncate_setsize(inode, ia->ia_size);
 870                         lower_ia->ia_size = ia->ia_size;
 871                         lower_ia->ia_valid |= ATTR_SIZE;
 872                         goto out;
 873                 }
 874                 if (num_zeros) {
 875                         char *zeros_virt;
 876
 877                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 878                         if (!zeros_virt) {
 879                                 rc = -ENOMEM;
 880                                 goto out;
 881                         }
 882                         rc = ecryptfs_write(inode, zeros_virt,
 883                                             ia->ia_size, num_zeros);
 884                         kfree(zeros_virt);
 885                         if (rc) {
 886                                 printk(KERN_ERR "Error attempting to zero out "
 887                                        "the remainder of the end page on "
 888                                        "reducing truncate; rc = [%d]\n", rc);
 889                                 goto out;
 890                         }
 891                 }
 892                 truncate_setsize(inode, ia->ia_size);
 893                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 894                 if (rc) {
 895                         printk(KERN_ERR "Problem with "
 896                                "ecryptfs_write_inode_size_to_metadata; "
 897                                "rc = [%d]\n", rc);
 898                         goto out;
 899                 }
 900                 /* We are reducing the size of the ecryptfs file, and need to
 901                  * know if we need to reduce the size of the lower file. */
 902                 lower_size_before_truncate =
 903                     upper_size_to_lower_size(crypt_stat, i_size);
 904                 lower_size_after_truncate =
 905                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 906                 if (lower_size_after_truncate < lower_size_before_truncate) {
 907                         lower_ia->ia_size = lower_size_after_truncate;
 908                         lower_ia->ia_valid |= ATTR_SIZE;
 909                 } else
 910                         lower_ia->ia_valid &= ~ATTR_SIZE;
 911         }
 912 out:
 913         ecryptfs_put_lower_file(inode);
 914         return rc;
 915 }
 916
 917 /**
 918  * ecryptfs_truncate
 919  * @dentry: The ecryptfs layer dentry
 920  * @new_length: The length to expand the file to
 921  *
 922  * Simple function that handles the truncation of an eCryptfs inode and
 923  * its corresponding lower inode.
 924  *
 925  * Returns zero on success; non-zero otherwise
 926  */
 927 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 928 {
 929         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 930         struct iattr lower_ia = { .ia_valid = 0 };
 931         int rc;
 932
 933         rc = truncate_upper(dentry, &ia, &lower_ia);
 934         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 935                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 936
 937                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 938                 rc = notify_change(lower_dentry, &lower_ia);
 939                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 940         }
 941         return rc;
 942 }
 943
 944 static int
 945 ecryptfs_permission(struct inode *inode, int mask, unsigned int flags)
 946 {
 947         if (flags & IPERM_FLAG_RCU)
 948                 return -ECHILD;
 949         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 950 }
 951
 952 /**
 953  * ecryptfs_setattr
 954  * @dentry: dentry handle to the inode to modify
 955  * @ia: Structure with flags of what to change and values
 956  *
 957  * Updates the metadata of an inode. If the update is to the size
 958  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 959  * of both the ecryptfs inode and the lower inode.
 960  *
 961  * All other metadata changes will be passed right to the lower filesystem,
 962  * and we will just update our inode to look like the lower.
 963  */
 964 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 965 {
 966         int rc = 0;
 967         struct dentry *lower_dentry;
 968         struct iattr lower_ia;
 969         struct inode *inode;
 970         struct inode *lower_inode;
 971         struct ecryptfs_crypt_stat *crypt_stat;
 972
 973         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 974         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 975                 ecryptfs_init_crypt_stat(crypt_stat);
 976         inode = dentry->d_inode;
 977         lower_inode = ecryptfs_inode_to_lower(inode);
 978         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 979         mutex_lock(&crypt_stat->cs_mutex);
 980         if (S_ISDIR(dentry->d_inode->i_mode))
 981                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 982         else if (S_ISREG(dentry->d_inode->i_mode)
 983                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 984                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 985                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 986
 987                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 988                         dentry->d_sb)->mount_crypt_stat;
 989                 rc = ecryptfs_get_lower_file(dentry, inode);
 990                 if (rc) {
 991                         mutex_unlock(&crypt_stat->cs_mutex);
 992                         goto out;
 993                 }
 994                 rc = ecryptfs_read_metadata(dentry);
 995                 ecryptfs_put_lower_file(inode);
 996                 if (rc) {
 997                         if (!(mount_crypt_stat->flags
 998                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 999                                 rc = -EIO;
1000                                 printk(KERN_WARNING "Either the lower file "
1001                                        "is not in a valid eCryptfs format, "
1002                                        "or the key could not be retrieved. "
1003                                        "Plaintext passthrough mode is not "
1004                                        "enabled; returning -EIO\n");
1005                                 mutex_unlock(&crypt_stat->cs_mutex);
1006                                 goto out;
1007                         }
1008                         rc = 0;
1009                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
1010                                                | ECRYPTFS_ENCRYPTED);
1011                 }
1012         }
1013         mutex_unlock(&crypt_stat->cs_mutex);
1014         if (S_ISREG(inode->i_mode)) {
1015                 rc = filemap_write_and_wait(inode->i_mapping);
1016                 if (rc)
1017                         goto out;
1018                 fsstack_copy_attr_all(inode, lower_inode);
1019         }
1020         memcpy(&lower_ia, ia, sizeof(lower_ia));
1021         if (ia->ia_valid & ATTR_FILE)
1022                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1023         if (ia->ia_valid & ATTR_SIZE) {
1024                 rc = truncate_upper(dentry, ia, &lower_ia);
1025                 if (rc < 0)
1026                         goto out;
1027         }
1028
1029         /*
1030          * mode change is for clearing setuid/setgid bits. Allow lower fs
1031          * to interpret this in its own way.
1032          */
1033         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1034                 lower_ia.ia_valid &= ~ATTR_MODE;
1035
1036         mutex_lock(&lower_dentry->d_inode->i_mutex);
1037         rc = notify_change(lower_dentry, &lower_ia);
1038         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1039 out:
1040         fsstack_copy_attr_all(inode, lower_inode);
1041         return rc;
1042 }
1043
1044 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1045                           struct kstat *stat)
1046 {
1047         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1048         int rc = 0;
1049
1050         mount_crypt_stat = &ecryptfs_superblock_to_private(
1051                                                 dentry->d_sb)->mount_crypt_stat;
1052         generic_fillattr(dentry->d_inode, stat);
1053         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1054                 char *target;
1055                 size_t targetsiz;
1056
1057                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1058                 if (!rc) {
1059                         kfree(target);
1060                         stat->size = targetsiz;
1061                 }
1062         }
1063         return rc;
1064 }
1065
1066 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1067                      struct kstat *stat)
1068 {
1069         struct kstat lower_stat;
1070         int rc;
1071
1072         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1073                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1074         if (!rc) {
1075                 fsstack_copy_attr_all(dentry->d_inode,
1076                                       ecryptfs_inode_to_lower(dentry->d_inode));
1077                 generic_fillattr(dentry->d_inode, stat);
1078                 stat->blocks = lower_stat.blocks;
1079         }
1080         return rc;
1081 }
1082
1083 int
1084 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1085                   size_t size, int flags)
1086 {
1087         int rc = 0;
1088         struct dentry *lower_dentry;
1089
1090         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1091         if (!lower_dentry->d_inode->i_op->setxattr) {
1092                 rc = -EOPNOTSUPP;
1093                 goto out;
1094         }
1095
1096         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1097 out:
1098         return rc;
1099 }
1100
1101 ssize_t
1102 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1103                         void *value, size_t size)
1104 {
1105         int rc = 0;
1106
1107         if (!lower_dentry->d_inode->i_op->getxattr) {
1108                 rc = -EOPNOTSUPP;
1109                 goto out;
1110         }
1111         mutex_lock(&lower_dentry->d_inode->i_mutex);
1112         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1113                                                    size);
1114         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1115 out:
1116         return rc;
1117 }
1118
1119 static ssize_t
1120 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1121                   size_t size)
1122 {
1123         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1124                                        value, size);
1125 }
1126
1127 static ssize_t
1128 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1129 {
1130         int rc = 0;
1131         struct dentry *lower_dentry;
1132
1133         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1134         if (!lower_dentry->d_inode->i_op->listxattr) {
1135                 rc = -EOPNOTSUPP;
1136                 goto out;
1137         }
1138         mutex_lock(&lower_dentry->d_inode->i_mutex);
1139         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1140         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1141 out:
1142         return rc;
1143 }
1144
1145 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1146 {
1147         int rc = 0;
1148         struct dentry *lower_dentry;
1149
1150         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1151         if (!lower_dentry->d_inode->i_op->removexattr) {
1152                 rc = -EOPNOTSUPP;
1153                 goto out;
1154         }
1155         mutex_lock(&lower_dentry->d_inode->i_mutex);
1156         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1157         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1158 out:
1159         return rc;
1160 }
1161
1162 const struct inode_operations ecryptfs_symlink_iops = {
1163         .readlink = ecryptfs_readlink,
1164         .follow_link = ecryptfs_follow_link,
1165         .put_link = ecryptfs_put_link,
1166         .permission = ecryptfs_permission,
1167         .setattr = ecryptfs_setattr,
1168         .getattr = ecryptfs_getattr_link,
1169         .setxattr = ecryptfs_setxattr,
1170         .getxattr = ecryptfs_getxattr,
1171         .listxattr = ecryptfs_listxattr,
1172         .removexattr = ecryptfs_removexattr
1173 };
1174
1175 const struct inode_operations ecryptfs_dir_iops = {
1176         .create = ecryptfs_create,
1177         .lookup = ecryptfs_lookup,
1178         .link = ecryptfs_link,
1179         .unlink = ecryptfs_unlink,
1180         .symlink = ecryptfs_symlink,
1181         .mkdir = ecryptfs_mkdir,
1182         .rmdir = ecryptfs_rmdir,
1183         .mknod = ecryptfs_mknod,
1184         .rename = ecryptfs_rename,
1185         .permission = ecryptfs_permission,
1186         .setattr = ecryptfs_setattr,
1187         .setxattr = ecryptfs_setxattr,
1188         .getxattr = ecryptfs_getxattr,
1189         .listxattr = ecryptfs_listxattr,
1190         .removexattr = ecryptfs_removexattr
1191 };
1192
1193 const struct inode_operations ecryptfs_main_iops = {
1194         .permission = ecryptfs_permission,
1195         .setattr = ecryptfs_setattr,
1196         .getattr = ecryptfs_getattr,
1197         .setxattr = ecryptfs_setxattr,
1198         .getxattr = ecryptfs_getxattr,
1199         .listxattr = ecryptfs_listxattr,
1200         .removexattr = ecryptfs_removexattr
1201 };