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