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         inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi;
  73
  74         if (S_ISLNK(inode->i_mode))
  75                 inode->i_op = &ecryptfs_symlink_iops;
  76         else if (S_ISDIR(inode->i_mode))
  77                 inode->i_op = &ecryptfs_dir_iops;
  78         else
  79                 inode->i_op = &ecryptfs_main_iops;
  80
  81         if (S_ISDIR(inode->i_mode))
  82                 inode->i_fop = &ecryptfs_dir_fops;
  83         else if (special_file(inode->i_mode))
  84                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  85         else
  86                 inode->i_fop = &ecryptfs_main_fops;
  87
  88         return 0;
  89 }
  90
  91 static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
  92                                           struct super_block *sb)
  93 {
  94         struct inode *inode;
  95
  96         if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
  97                 return ERR_PTR(-EXDEV);
  98         if (!igrab(lower_inode))
  99                 return ERR_PTR(-ESTALE);
 100         inode = iget5_locked(sb, (unsigned long)lower_inode,
 101                              ecryptfs_inode_test, ecryptfs_inode_set,
 102                              lower_inode);
 103         if (!inode) {
 104                 iput(lower_inode);
 105                 return ERR_PTR(-EACCES);
 106         }
 107         if (!(inode->i_state & I_NEW))
 108                 iput(lower_inode);
 109
 110         return inode;
 111 }
 112
 113 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 114                                  struct super_block *sb)
 115 {
 116         struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
 117
 118         if (!IS_ERR(inode) && (inode->i_state & I_NEW))
 119                 unlock_new_inode(inode);
 120
 121         return inode;
 122 }
 123
 124 /**
 125  * ecryptfs_interpose
 126  * @lower_dentry: Existing dentry in the lower filesystem
 127  * @dentry: ecryptfs' dentry
 128  * @sb: ecryptfs's super_block
 129  *
 130  * Interposes upper and lower dentries.
 131  *
 132  * Returns zero on success; non-zero otherwise
 133  */
 134 static int ecryptfs_interpose(struct dentry *lower_dentry,
 135                               struct dentry *dentry, struct super_block *sb)
 136 {
 137         struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb);
 138
 139         if (IS_ERR(inode))
 140                 return PTR_ERR(inode);
 141         d_instantiate(dentry, inode);
 142
 143         return 0;
 144 }
 145
 146 /**
 147  * ecryptfs_create_underlying_file
 148  * @lower_dir_inode: inode of the parent in the lower fs of the new file
 149  * @dentry: New file's dentry
 150  * @mode: The mode of the new file
 151  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 152  *
 153  * Creates the file in the lower file system.
 154  *
 155  * Returns zero on success; non-zero on error condition
 156  */
 157 static int
 158 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
 159                                 struct dentry *dentry, int mode,
 160                                 struct nameidata *nd)
 161 {
 162         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 163         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
 164         struct dentry *dentry_save;
 165         struct vfsmount *vfsmount_save;
 166         unsigned int flags_save;
 167         int rc;
 168
 169         if (nd) {
 170                 dentry_save = nd->path.dentry;
 171                 vfsmount_save = nd->path.mnt;
 172                 flags_save = nd->flags;
 173                 nd->path.dentry = lower_dentry;
 174                 nd->path.mnt = lower_mnt;
 175                 nd->flags &= ~LOOKUP_OPEN;
 176         }
 177         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
 178         if (nd) {
 179                 nd->path.dentry = dentry_save;
 180                 nd->path.mnt = vfsmount_save;
 181                 nd->flags = flags_save;
 182         }
 183         return rc;
 184 }
 185
 186 /**
 187  * ecryptfs_do_create
 188  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
 189  * @ecryptfs_dentry: New file's dentry in ecryptfs
 190  * @mode: The mode of the new file
 191  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 192  *
 193  * Creates the underlying file and the eCryptfs inode which will link to
 194  * it. It will also update the eCryptfs directory inode to mimic the
 195  * stat of the lower directory inode.
 196  *
 197  * Returns zero on success; non-zero on error condition
 198  */
 199 static int
 200 ecryptfs_do_create(struct inode *directory_inode,
 201                    struct dentry *ecryptfs_dentry, int mode,
 202                    struct nameidata *nd)
 203 {
 204         int rc;
 205         struct dentry *lower_dentry;
 206         struct dentry *lower_dir_dentry;
 207
 208         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 209         lower_dir_dentry = lock_parent(lower_dentry);
 210         if (IS_ERR(lower_dir_dentry)) {
 211                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 212                                 "dentry\n");
 213                 rc = PTR_ERR(lower_dir_dentry);
 214                 goto out;
 215         }
 216         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 217                                              ecryptfs_dentry, mode, nd);
 218         if (rc) {
 219                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 220                        "rc = [%d]\n", __func__, rc);
 221                 goto out_lock;
 222         }
 223         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 224                                 directory_inode->i_sb);
 225         if (rc) {
 226                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 227                 goto out_lock;
 228         }
 229         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 230         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 231 out_lock:
 232         unlock_dir(lower_dir_dentry);
 233 out:
 234         return rc;
 235 }
 236
 237 /**
 238  * ecryptfs_initialize_file
 239  *
 240  * Cause the file to be changed from a basic empty file to an ecryptfs
 241  * file with a header and first data page.
 242  *
 243  * Returns zero on success
 244  */
 245 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 246 {
 247         struct ecryptfs_crypt_stat *crypt_stat =
 248                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 249         int rc = 0;
 250
 251         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 252                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 253                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 254                 goto out;
 255         }
 256         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 257         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 258         if (rc) {
 259                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 260                                 "context; rc = [%d]\n", rc);
 261                 goto out;
 262         }
 263         rc = ecryptfs_get_lower_file(ecryptfs_dentry,
 264                                      ecryptfs_dentry->d_inode);
 265         if (rc) {
 266                 printk(KERN_ERR "%s: Error attempting to initialize "
 267                         "the lower file for the dentry with name "
 268                         "[%s]; rc = [%d]\n", __func__,
 269                         ecryptfs_dentry->d_name.name, rc);
 270                 goto out;
 271         }
 272         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 273         if (rc)
 274                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 275         ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 276 out:
 277         return rc;
 278 }
 279
 280 /**
 281  * ecryptfs_create
 282  * @dir: The inode of the directory in which to create the file.
 283  * @dentry: The eCryptfs dentry
 284  * @mode: The mode of the new file.
 285  * @nd: nameidata
 286  *
 287  * Creates a new file.
 288  *
 289  * Returns zero on success; non-zero on error condition
 290  */
 291 static int
 292 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 293                 int mode, struct nameidata *nd)
 294 {
 295         int rc;
 296
 297         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 298         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 299         if (unlikely(rc)) {
 300                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 301                                 "lower filesystem\n");
 302                 goto out;
 303         }
 304         /* At this point, a file exists on "disk"; we need to make sure
 305          * that this on disk file is prepared to be an ecryptfs file */
 306         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 307 out:
 308         return rc;
 309 }
 310
 311 static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
 312 {
 313         struct ecryptfs_crypt_stat *crypt_stat;
 314         int rc;
 315
 316         rc = ecryptfs_get_lower_file(dentry, inode);
 317         if (rc) {
 318                 printk(KERN_ERR "%s: Error attempting to initialize "
 319                         "the lower file for the dentry with name "
 320                         "[%s]; rc = [%d]\n", __func__,
 321                         dentry->d_name.name, rc);
 322                 return rc;
 323         }
 324
 325         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 326         /* TODO: lock for crypt_stat comparison */
 327         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 328                 ecryptfs_set_default_sizes(crypt_stat);
 329
 330         rc = ecryptfs_read_and_validate_header_region(inode);
 331         ecryptfs_put_lower_file(inode);
 332         if (rc) {
 333                 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
 334                 if (!rc)
 335                         crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 336         }
 337
 338         /* Must return 0 to allow non-eCryptfs files to be looked up, too */
 339         return 0;
 340 }
 341
 342 /**
 343  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
 344  */
 345 static int ecryptfs_lookup_interpose(struct dentry *dentry,
 346                                      struct dentry *lower_dentry,
 347                                      struct inode *dir_inode)
 348 {
 349         struct inode *inode, *lower_inode = lower_dentry->d_inode;
 350         struct ecryptfs_dentry_info *dentry_info;
 351         struct vfsmount *lower_mnt;
 352         int rc = 0;
 353
 354         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
 355         fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode);
 356         BUG_ON(!lower_dentry->d_count);
 357
 358         dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
 359         ecryptfs_set_dentry_private(dentry, dentry_info);
 360         if (!dentry_info) {
 361                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 362                        "to allocate ecryptfs_dentry_info struct\n",
 363                         __func__);
 364                 dput(lower_dentry);
 365                 mntput(lower_mnt);
 366                 d_drop(dentry);
 367                 return -ENOMEM;
 368         }
 369         ecryptfs_set_dentry_lower(dentry, lower_dentry);
 370         ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
 371
 372         if (!lower_dentry->d_inode) {
 373                 /* We want to add because we couldn't find in lower */
 374                 d_add(dentry, NULL);
 375                 return 0;
 376         }
 377         inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
 378         if (IS_ERR(inode)) {
 379                 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
 380                        __func__, PTR_ERR(inode));
 381                 return PTR_ERR(inode);
 382         }
 383         if (S_ISREG(inode->i_mode)) {
 384                 rc = ecryptfs_i_size_read(dentry, inode);
 385                 if (rc) {
 386                         make_bad_inode(inode);
 387                         return rc;
 388                 }
 389         }
 390
 391         if (inode->i_state & I_NEW)
 392                 unlock_new_inode(inode);
 393         d_add(dentry, inode);
 394
 395         return rc;
 396 }
 397
 398 /**
 399  * ecryptfs_lookup
 400  * @ecryptfs_dir_inode: The eCryptfs directory inode
 401  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 402  * @ecryptfs_nd: nameidata; may be NULL
 403  *
 404  * Find a file on disk. If the file does not exist, then we'll add it to the
 405  * dentry cache and continue on to read it from the disk.
 406  */
 407 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 408                                       struct dentry *ecryptfs_dentry,
 409                                       struct nameidata *ecryptfs_nd)
 410 {
 411         char *encrypted_and_encoded_name = NULL;
 412         size_t encrypted_and_encoded_name_size;
 413         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 414         struct dentry *lower_dir_dentry, *lower_dentry;
 415         int rc = 0;
 416
 417         if ((ecryptfs_dentry->d_name.len == 1
 418              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 419             || (ecryptfs_dentry->d_name.len == 2
 420                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 421                 goto out_d_drop;
 422         }
 423         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 424         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 425         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 426                                       lower_dir_dentry,
 427                                       ecryptfs_dentry->d_name.len);
 428         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 429         if (IS_ERR(lower_dentry)) {
 430                 rc = PTR_ERR(lower_dentry);
 431                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 432                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 433                                 encrypted_and_encoded_name);
 434                 goto out_d_drop;
 435         }
 436         if (lower_dentry->d_inode)
 437                 goto interpose;
 438         mount_crypt_stat = &ecryptfs_superblock_to_private(
 439                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 440         if (!(mount_crypt_stat
 441             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 442                 goto interpose;
 443         dput(lower_dentry);
 444         rc = ecryptfs_encrypt_and_encode_filename(
 445                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 446                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 447                 ecryptfs_dentry->d_name.len);
 448         if (rc) {
 449                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 450                        "filename; rc = [%d]\n", __func__, rc);
 451                 goto out_d_drop;
 452         }
 453         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 454         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 455                                       lower_dir_dentry,
 456                                       encrypted_and_encoded_name_size);
 457         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 458         if (IS_ERR(lower_dentry)) {
 459                 rc = PTR_ERR(lower_dentry);
 460                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 461                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 462                                 encrypted_and_encoded_name);
 463                 goto out_d_drop;
 464         }
 465 interpose:
 466         rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
 467                                        ecryptfs_dir_inode);
 468         goto out;
 469 out_d_drop:
 470         d_drop(ecryptfs_dentry);
 471 out:
 472         kfree(encrypted_and_encoded_name);
 473         return ERR_PTR(rc);
 474 }
 475
 476 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 477                          struct dentry *new_dentry)
 478 {
 479         struct dentry *lower_old_dentry;
 480         struct dentry *lower_new_dentry;
 481         struct dentry *lower_dir_dentry;
 482         u64 file_size_save;
 483         int rc;
 484
 485         file_size_save = i_size_read(old_dentry->d_inode);
 486         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 487         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 488         dget(lower_old_dentry);
 489         dget(lower_new_dentry);
 490         lower_dir_dentry = lock_parent(lower_new_dentry);
 491         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 492                       lower_new_dentry);
 493         if (rc || !lower_new_dentry->d_inode)
 494                 goto out_lock;
 495         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
 496         if (rc)
 497                 goto out_lock;
 498         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 499         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 500         old_dentry->d_inode->i_nlink =
 501                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 502         i_size_write(new_dentry->d_inode, file_size_save);
 503 out_lock:
 504         unlock_dir(lower_dir_dentry);
 505         dput(lower_new_dentry);
 506         dput(lower_old_dentry);
 507         return rc;
 508 }
 509
 510 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 511 {
 512         int rc = 0;
 513         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 514         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 515         struct dentry *lower_dir_dentry;
 516
 517         dget(lower_dentry);
 518         lower_dir_dentry = lock_parent(lower_dentry);
 519         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 520         if (rc) {
 521                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 522                 goto out_unlock;
 523         }
 524         fsstack_copy_attr_times(dir, lower_dir_inode);
 525         dentry->d_inode->i_nlink =
 526                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 527         dentry->d_inode->i_ctime = dir->i_ctime;
 528         d_drop(dentry);
 529 out_unlock:
 530         unlock_dir(lower_dir_dentry);
 531         dput(lower_dentry);
 532         return rc;
 533 }
 534
 535 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 536                             const char *symname)
 537 {
 538         int rc;
 539         struct dentry *lower_dentry;
 540         struct dentry *lower_dir_dentry;
 541         char *encoded_symname;
 542         size_t encoded_symlen;
 543         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 544
 545         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 546         dget(lower_dentry);
 547         lower_dir_dentry = lock_parent(lower_dentry);
 548         mount_crypt_stat = &ecryptfs_superblock_to_private(
 549                 dir->i_sb)->mount_crypt_stat;
 550         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 551                                                   &encoded_symlen,
 552                                                   NULL,
 553                                                   mount_crypt_stat, symname,
 554                                                   strlen(symname));
 555         if (rc)
 556                 goto out_lock;
 557         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 558                          encoded_symname);
 559         kfree(encoded_symname);
 560         if (rc || !lower_dentry->d_inode)
 561                 goto out_lock;
 562         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 563         if (rc)
 564                 goto out_lock;
 565         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 566         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 567 out_lock:
 568         unlock_dir(lower_dir_dentry);
 569         dput(lower_dentry);
 570         if (!dentry->d_inode)
 571                 d_drop(dentry);
 572         return rc;
 573 }
 574
 575 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 576 {
 577         int rc;
 578         struct dentry *lower_dentry;
 579         struct dentry *lower_dir_dentry;
 580
 581         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 582         lower_dir_dentry = lock_parent(lower_dentry);
 583         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 584         if (rc || !lower_dentry->d_inode)
 585                 goto out;
 586         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 587         if (rc)
 588                 goto out;
 589         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 590         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 591         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 592 out:
 593         unlock_dir(lower_dir_dentry);
 594         if (!dentry->d_inode)
 595                 d_drop(dentry);
 596         return rc;
 597 }
 598
 599 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 600 {
 601         struct dentry *lower_dentry;
 602         struct dentry *lower_dir_dentry;
 603         int rc;
 604
 605         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 606         dget(dentry);
 607         lower_dir_dentry = lock_parent(lower_dentry);
 608         dget(lower_dentry);
 609         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 610         dput(lower_dentry);
 611         if (!rc && dentry->d_inode)
 612                 clear_nlink(dentry->d_inode);
 613         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 614         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 615         unlock_dir(lower_dir_dentry);
 616         if (!rc)
 617                 d_drop(dentry);
 618         dput(dentry);
 619         return rc;
 620 }
 621
 622 static int
 623 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 624 {
 625         int rc;
 626         struct dentry *lower_dentry;
 627         struct dentry *lower_dir_dentry;
 628
 629         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 630         lower_dir_dentry = lock_parent(lower_dentry);
 631         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 632         if (rc || !lower_dentry->d_inode)
 633                 goto out;
 634         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 635         if (rc)
 636                 goto out;
 637         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 638         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 639 out:
 640         unlock_dir(lower_dir_dentry);
 641         if (!dentry->d_inode)
 642                 d_drop(dentry);
 643         return rc;
 644 }
 645
 646 static int
 647 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 648                 struct inode *new_dir, struct dentry *new_dentry)
 649 {
 650         int rc;
 651         struct dentry *lower_old_dentry;
 652         struct dentry *lower_new_dentry;
 653         struct dentry *lower_old_dir_dentry;
 654         struct dentry *lower_new_dir_dentry;
 655         struct dentry *trap = NULL;
 656
 657         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 658         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 659         dget(lower_old_dentry);
 660         dget(lower_new_dentry);
 661         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 662         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 663         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 664         /* source should not be ancestor of target */
 665         if (trap == lower_old_dentry) {
 666                 rc = -EINVAL;
 667                 goto out_lock;
 668         }
 669         /* target should not be ancestor of source */
 670         if (trap == lower_new_dentry) {
 671                 rc = -ENOTEMPTY;
 672                 goto out_lock;
 673         }
 674         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 675                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 676         if (rc)
 677                 goto out_lock;
 678         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 679         if (new_dir != old_dir)
 680                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 681 out_lock:
 682         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 683         dput(lower_new_dir_dentry);
 684         dput(lower_old_dir_dentry);
 685         dput(lower_new_dentry);
 686         dput(lower_old_dentry);
 687         return rc;
 688 }
 689
 690 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 691                                    size_t *bufsiz)
 692 {
 693         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 694         char *lower_buf;
 695         size_t lower_bufsiz = PATH_MAX;
 696         mm_segment_t old_fs;
 697         int rc;
 698
 699         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 700         if (!lower_buf) {
 701                 rc = -ENOMEM;
 702                 goto out;
 703         }
 704         old_fs = get_fs();
 705         set_fs(get_ds());
 706         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 707                                                    (char __user *)lower_buf,
 708                                                    lower_bufsiz);
 709         set_fs(old_fs);
 710         if (rc < 0)
 711                 goto out;
 712         lower_bufsiz = rc;
 713         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 714                                                   lower_buf, lower_bufsiz);
 715 out:
 716         kfree(lower_buf);
 717         return rc;
 718 }
 719
 720 static int
 721 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 722 {
 723         char *kbuf;
 724         size_t kbufsiz, copied;
 725         int rc;
 726
 727         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 728         if (rc)
 729                 goto out;
 730         copied = min_t(size_t, bufsiz, kbufsiz);
 731         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 732         kfree(kbuf);
 733         fsstack_copy_attr_atime(dentry->d_inode,
 734                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 735 out:
 736         return rc;
 737 }
 738
 739 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 740 {
 741         char *buf;
 742         int len = PAGE_SIZE, rc;
 743         mm_segment_t old_fs;
 744
 745         /* Released in ecryptfs_put_link(); only release here on error */
 746         buf = kmalloc(len, GFP_KERNEL);
 747         if (!buf) {
 748                 buf = ERR_PTR(-ENOMEM);
 749                 goto out;
 750         }
 751         old_fs = get_fs();
 752         set_fs(get_ds());
 753         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 754         set_fs(old_fs);
 755         if (rc < 0) {
 756                 kfree(buf);
 757                 buf = ERR_PTR(rc);
 758         } else
 759                 buf[rc] = '\0';
 760 out:
 761         nd_set_link(nd, buf);
 762         return NULL;
 763 }
 764
 765 static void
 766 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 767 {
 768         char *buf = nd_get_link(nd);
 769         if (!IS_ERR(buf)) {
 770                 /* Free the char* */
 771                 kfree(buf);
 772         }
 773 }
 774
 775 /**
 776  * upper_size_to_lower_size
 777  * @crypt_stat: Crypt_stat associated with file
 778  * @upper_size: Size of the upper file
 779  *
 780  * Calculate the required size of the lower file based on the
 781  * specified size of the upper file. This calculation is based on the
 782  * number of headers in the underlying file and the extent size.
 783  *
 784  * Returns Calculated size of the lower file.
 785  */
 786 static loff_t
 787 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 788                          loff_t upper_size)
 789 {
 790         loff_t lower_size;
 791
 792         lower_size = ecryptfs_lower_header_size(crypt_stat);
 793         if (upper_size != 0) {
 794                 loff_t num_extents;
 795
 796                 num_extents = upper_size >> crypt_stat->extent_shift;
 797                 if (upper_size & ~crypt_stat->extent_mask)
 798                         num_extents++;
 799                 lower_size += (num_extents * crypt_stat->extent_size);
 800         }
 801         return lower_size;
 802 }
 803
 804 /**
 805  * truncate_upper
 806  * @dentry: The ecryptfs layer dentry
 807  * @ia: Address of the ecryptfs inode's attributes
 808  * @lower_ia: Address of the lower inode's attributes
 809  *
 810  * Function to handle truncations modifying the size of the file. Note
 811  * that the file sizes are interpolated. When expanding, we are simply
 812  * writing strings of 0's out. When truncating, we truncate the upper
 813  * inode and update the lower_ia according to the page index
 814  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 815  * the caller must use lower_ia in a call to notify_change() to perform
 816  * the truncation of the lower inode.
 817  *
 818  * Returns zero on success; non-zero otherwise
 819  */
 820 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 821                           struct iattr *lower_ia)
 822 {
 823         int rc = 0;
 824         struct inode *inode = dentry->d_inode;
 825         struct ecryptfs_crypt_stat *crypt_stat;
 826         loff_t i_size = i_size_read(inode);
 827         loff_t lower_size_before_truncate;
 828         loff_t lower_size_after_truncate;
 829
 830         if (unlikely((ia->ia_size == i_size))) {
 831                 lower_ia->ia_valid &= ~ATTR_SIZE;
 832                 return 0;
 833         }
 834         rc = ecryptfs_get_lower_file(dentry, inode);
 835         if (rc)
 836                 return rc;
 837         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 838         /* Switch on growing or shrinking file */
 839         if (ia->ia_size > i_size) {
 840                 char zero[] = { 0x00 };
 841
 842                 lower_ia->ia_valid &= ~ATTR_SIZE;
 843                 /* Write a single 0 at the last position of the file;
 844                  * this triggers code that will fill in 0's throughout
 845                  * the intermediate portion of the previous end of the
 846                  * file and the new and of the file */
 847                 rc = ecryptfs_write(inode, zero,
 848                                     (ia->ia_size - 1), 1);
 849         } else { /* ia->ia_size < i_size_read(inode) */
 850                 /* We're chopping off all the pages down to the page
 851                  * in which ia->ia_size is located. Fill in the end of
 852                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 853                  * PAGE_CACHE_SIZE with zeros. */
 854                 size_t num_zeros = (PAGE_CACHE_SIZE
 855                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 856
 857                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 858                         truncate_setsize(inode, ia->ia_size);
 859                         lower_ia->ia_size = ia->ia_size;
 860                         lower_ia->ia_valid |= ATTR_SIZE;
 861                         goto out;
 862                 }
 863                 if (num_zeros) {
 864                         char *zeros_virt;
 865
 866                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 867                         if (!zeros_virt) {
 868                                 rc = -ENOMEM;
 869                                 goto out;
 870                         }
 871                         rc = ecryptfs_write(inode, zeros_virt,
 872                                             ia->ia_size, num_zeros);
 873                         kfree(zeros_virt);
 874                         if (rc) {
 875                                 printk(KERN_ERR "Error attempting to zero out "
 876                                        "the remainder of the end page on "
 877                                        "reducing truncate; rc = [%d]\n", rc);
 878                                 goto out;
 879                         }
 880                 }
 881                 truncate_setsize(inode, ia->ia_size);
 882                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 883                 if (rc) {
 884                         printk(KERN_ERR "Problem with "
 885                                "ecryptfs_write_inode_size_to_metadata; "
 886                                "rc = [%d]\n", rc);
 887                         goto out;
 888                 }
 889                 /* We are reducing the size of the ecryptfs file, and need to
 890                  * know if we need to reduce the size of the lower file. */
 891                 lower_size_before_truncate =
 892                     upper_size_to_lower_size(crypt_stat, i_size);
 893                 lower_size_after_truncate =
 894                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 895                 if (lower_size_after_truncate < lower_size_before_truncate) {
 896                         lower_ia->ia_size = lower_size_after_truncate;
 897                         lower_ia->ia_valid |= ATTR_SIZE;
 898                 } else
 899                         lower_ia->ia_valid &= ~ATTR_SIZE;
 900         }
 901 out:
 902         ecryptfs_put_lower_file(inode);
 903         return rc;
 904 }
 905
 906 static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
 907 {
 908         struct ecryptfs_crypt_stat *crypt_stat;
 909         loff_t lower_oldsize, lower_newsize;
 910
 911         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 912         lower_oldsize = upper_size_to_lower_size(crypt_stat,
 913                                                  i_size_read(inode));
 914         lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
 915         if (lower_newsize > lower_oldsize) {
 916                 /*
 917                  * The eCryptfs inode and the new *lower* size are mixed here
 918                  * because we may not have the lower i_mutex held and/or it may
 919                  * not be appropriate to call inode_newsize_ok() with inodes
 920                  * from other filesystems.
 921                  */
 922                 return inode_newsize_ok(inode, lower_newsize);
 923         }
 924
 925         return 0;
 926 }
 927
 928 /**
 929  * ecryptfs_truncate
 930  * @dentry: The ecryptfs layer dentry
 931  * @new_length: The length to expand the file to
 932  *
 933  * Simple function that handles the truncation of an eCryptfs inode and
 934  * its corresponding lower inode.
 935  *
 936  * Returns zero on success; non-zero otherwise
 937  */
 938 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 939 {
 940         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 941         struct iattr lower_ia = { .ia_valid = 0 };
 942         int rc;
 943
 944         rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length);
 945         if (rc)
 946                 return rc;
 947
 948         rc = truncate_upper(dentry, &ia, &lower_ia);
 949         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 950                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 951
 952                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 953                 rc = notify_change(lower_dentry, &lower_ia);
 954                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 955         }
 956         return rc;
 957 }
 958
 959 static int
 960 ecryptfs_permission(struct inode *inode, int mask, unsigned int flags)
 961 {
 962         if (flags & IPERM_FLAG_RCU)
 963                 return -ECHILD;
 964         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 965 }
 966
 967 /**
 968  * ecryptfs_setattr
 969  * @dentry: dentry handle to the inode to modify
 970  * @ia: Structure with flags of what to change and values
 971  *
 972  * Updates the metadata of an inode. If the update is to the size
 973  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 974  * of both the ecryptfs inode and the lower inode.
 975  *
 976  * All other metadata changes will be passed right to the lower filesystem,
 977  * and we will just update our inode to look like the lower.
 978  */
 979 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 980 {
 981         int rc = 0;
 982         struct dentry *lower_dentry;
 983         struct iattr lower_ia;
 984         struct inode *inode;
 985         struct inode *lower_inode;
 986         struct ecryptfs_crypt_stat *crypt_stat;
 987
 988         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 989         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 990                 ecryptfs_init_crypt_stat(crypt_stat);
 991         inode = dentry->d_inode;
 992         lower_inode = ecryptfs_inode_to_lower(inode);
 993         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 994         mutex_lock(&crypt_stat->cs_mutex);
 995         if (S_ISDIR(dentry->d_inode->i_mode))
 996                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 997         else if (S_ISREG(dentry->d_inode->i_mode)
 998                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 999                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
1000                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1001
1002                 mount_crypt_stat = &ecryptfs_superblock_to_private(
1003                         dentry->d_sb)->mount_crypt_stat;
1004                 rc = ecryptfs_get_lower_file(dentry, inode);
1005                 if (rc) {
1006                         mutex_unlock(&crypt_stat->cs_mutex);
1007                         goto out;
1008                 }
1009                 rc = ecryptfs_read_metadata(dentry);
1010                 ecryptfs_put_lower_file(inode);
1011                 if (rc) {
1012                         if (!(mount_crypt_stat->flags
1013                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
1014                                 rc = -EIO;
1015                                 printk(KERN_WARNING "Either the lower file "
1016                                        "is not in a valid eCryptfs format, "
1017                                        "or the key could not be retrieved. "
1018                                        "Plaintext passthrough mode is not "
1019                                        "enabled; returning -EIO\n");
1020                                 mutex_unlock(&crypt_stat->cs_mutex);
1021                                 goto out;
1022                         }
1023                         rc = 0;
1024                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
1025                                                | ECRYPTFS_ENCRYPTED);
1026                 }
1027         }
1028         mutex_unlock(&crypt_stat->cs_mutex);
1029
1030         rc = inode_change_ok(inode, ia);
1031         if (rc)
1032                 goto out;
1033         if (ia->ia_valid & ATTR_SIZE) {
1034                 rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
1035                 if (rc)
1036                         goto out;
1037         }
1038
1039         if (S_ISREG(inode->i_mode)) {
1040                 rc = filemap_write_and_wait(inode->i_mapping);
1041                 if (rc)
1042                         goto out;
1043                 fsstack_copy_attr_all(inode, lower_inode);
1044         }
1045         memcpy(&lower_ia, ia, sizeof(lower_ia));
1046         if (ia->ia_valid & ATTR_FILE)
1047                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1048         if (ia->ia_valid & ATTR_SIZE) {
1049                 rc = truncate_upper(dentry, ia, &lower_ia);
1050                 if (rc < 0)
1051                         goto out;
1052         }
1053
1054         /*
1055          * mode change is for clearing setuid/setgid bits. Allow lower fs
1056          * to interpret this in its own way.
1057          */
1058         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1059                 lower_ia.ia_valid &= ~ATTR_MODE;
1060
1061         mutex_lock(&lower_dentry->d_inode->i_mutex);
1062         rc = notify_change(lower_dentry, &lower_ia);
1063         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1064 out:
1065         fsstack_copy_attr_all(inode, lower_inode);
1066         return rc;
1067 }
1068
1069 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1070                           struct kstat *stat)
1071 {
1072         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1073         int rc = 0;
1074
1075         mount_crypt_stat = &ecryptfs_superblock_to_private(
1076                                                 dentry->d_sb)->mount_crypt_stat;
1077         generic_fillattr(dentry->d_inode, stat);
1078         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1079                 char *target;
1080                 size_t targetsiz;
1081
1082                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1083                 if (!rc) {
1084                         kfree(target);
1085                         stat->size = targetsiz;
1086                 }
1087         }
1088         return rc;
1089 }
1090
1091 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1092                      struct kstat *stat)
1093 {
1094         struct kstat lower_stat;
1095         int rc;
1096
1097         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1098                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1099         if (!rc) {
1100                 fsstack_copy_attr_all(dentry->d_inode,
1101                                       ecryptfs_inode_to_lower(dentry->d_inode));
1102                 generic_fillattr(dentry->d_inode, stat);
1103                 stat->blocks = lower_stat.blocks;
1104         }
1105         return rc;
1106 }
1107
1108 int
1109 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1110                   size_t size, int flags)
1111 {
1112         int rc = 0;
1113         struct dentry *lower_dentry;
1114
1115         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1116         if (!lower_dentry->d_inode->i_op->setxattr) {
1117                 rc = -EOPNOTSUPP;
1118                 goto out;
1119         }
1120
1121         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1122 out:
1123         return rc;
1124 }
1125
1126 ssize_t
1127 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1128                         void *value, size_t size)
1129 {
1130         int rc = 0;
1131
1132         if (!lower_dentry->d_inode->i_op->getxattr) {
1133                 rc = -EOPNOTSUPP;
1134                 goto out;
1135         }
1136         mutex_lock(&lower_dentry->d_inode->i_mutex);
1137         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1138                                                    size);
1139         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1140 out:
1141         return rc;
1142 }
1143
1144 static ssize_t
1145 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1146                   size_t size)
1147 {
1148         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1149                                        value, size);
1150 }
1151
1152 static ssize_t
1153 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1154 {
1155         int rc = 0;
1156         struct dentry *lower_dentry;
1157
1158         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1159         if (!lower_dentry->d_inode->i_op->listxattr) {
1160                 rc = -EOPNOTSUPP;
1161                 goto out;
1162         }
1163         mutex_lock(&lower_dentry->d_inode->i_mutex);
1164         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1165         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1166 out:
1167         return rc;
1168 }
1169
1170 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1171 {
1172         int rc = 0;
1173         struct dentry *lower_dentry;
1174
1175         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1176         if (!lower_dentry->d_inode->i_op->removexattr) {
1177                 rc = -EOPNOTSUPP;
1178                 goto out;
1179         }
1180         mutex_lock(&lower_dentry->d_inode->i_mutex);
1181         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1182         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1183 out:
1184         return rc;
1185 }
1186
1187 const struct inode_operations ecryptfs_symlink_iops = {
1188         .readlink = ecryptfs_readlink,
1189         .follow_link = ecryptfs_follow_link,
1190         .put_link = ecryptfs_put_link,
1191         .permission = ecryptfs_permission,
1192         .setattr = ecryptfs_setattr,
1193         .getattr = ecryptfs_getattr_link,
1194         .setxattr = ecryptfs_setxattr,
1195         .getxattr = ecryptfs_getxattr,
1196         .listxattr = ecryptfs_listxattr,
1197         .removexattr = ecryptfs_removexattr
1198 };
1199
1200 const struct inode_operations ecryptfs_dir_iops = {
1201         .create = ecryptfs_create,
1202         .lookup = ecryptfs_lookup,
1203         .link = ecryptfs_link,
1204         .unlink = ecryptfs_unlink,
1205         .symlink = ecryptfs_symlink,
1206         .mkdir = ecryptfs_mkdir,
1207         .rmdir = ecryptfs_rmdir,
1208         .mknod = ecryptfs_mknod,
1209         .rename = ecryptfs_rename,
1210         .permission = ecryptfs_permission,
1211         .setattr = ecryptfs_setattr,
1212         .setxattr = ecryptfs_setxattr,
1213         .getxattr = ecryptfs_getxattr,
1214         .listxattr = ecryptfs_listxattr,
1215         .removexattr = ecryptfs_removexattr
1216 };
1217
1218 const struct inode_operations ecryptfs_main_iops = {
1219         .permission = ecryptfs_permission,
1220         .setattr = ecryptfs_setattr,
1221         .getattr = ecryptfs_getattr,
1222         .setxattr = ecryptfs_setxattr,
1223         .getxattr = ecryptfs_getxattr,
1224         .listxattr = ecryptfs_listxattr,
1225         .removexattr = ecryptfs_removexattr
1226 };