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(&(d_inode(dir)->i_mutex), I_MUTEX_PARENT);
  45         return dir;
  46 }
  47
  48 static void unlock_dir(struct dentry *dir)
  49 {
  50         mutex_unlock(&d_inode(dir)->i_mutex);
  51         dput(dir);
  52 }
  53
  54 static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
  55 {
  56         return ecryptfs_inode_to_lower(inode) == lower_inode;
  57 }
  58
  59 static int ecryptfs_inode_set(struct inode *inode, void *opaque)
  60 {
  61         struct inode *lower_inode = opaque;
  62
  63         ecryptfs_set_inode_lower(inode, lower_inode);
  64         fsstack_copy_attr_all(inode, lower_inode);
  65         /* i_size will be overwritten for encrypted regular files */
  66         fsstack_copy_inode_size(inode, lower_inode);
  67         inode->i_ino = lower_inode->i_ino;
  68         inode->i_version++;
  69         inode->i_mapping->a_ops = &ecryptfs_aops;
  70
  71         if (S_ISLNK(inode->i_mode))
  72                 inode->i_op = &ecryptfs_symlink_iops;
  73         else if (S_ISDIR(inode->i_mode))
  74                 inode->i_op = &ecryptfs_dir_iops;
  75         else
  76                 inode->i_op = &ecryptfs_main_iops;
  77
  78         if (S_ISDIR(inode->i_mode))
  79                 inode->i_fop = &ecryptfs_dir_fops;
  80         else if (special_file(inode->i_mode))
  81                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  82         else
  83                 inode->i_fop = &ecryptfs_main_fops;
  84
  85         return 0;
  86 }
  87
  88 static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
  89                                           struct super_block *sb)
  90 {
  91         struct inode *inode;
  92
  93         if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
  94                 return ERR_PTR(-EXDEV);
  95         if (!igrab(lower_inode))
  96                 return ERR_PTR(-ESTALE);
  97         inode = iget5_locked(sb, (unsigned long)lower_inode,
  98                              ecryptfs_inode_test, ecryptfs_inode_set,
  99                              lower_inode);
 100         if (!inode) {
 101                 iput(lower_inode);
 102                 return ERR_PTR(-EACCES);
 103         }
 104         if (!(inode->i_state & I_NEW))
 105                 iput(lower_inode);
 106
 107         return inode;
 108 }
 109
 110 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 111                                  struct super_block *sb)
 112 {
 113         struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
 114
 115         if (!IS_ERR(inode) && (inode->i_state & I_NEW))
 116                 unlock_new_inode(inode);
 117
 118         return inode;
 119 }
 120
 121 /**
 122  * ecryptfs_interpose
 123  * @lower_dentry: Existing dentry in the lower filesystem
 124  * @dentry: ecryptfs' dentry
 125  * @sb: ecryptfs's super_block
 126  *
 127  * Interposes upper and lower dentries.
 128  *
 129  * Returns zero on success; non-zero otherwise
 130  */
 131 static int ecryptfs_interpose(struct dentry *lower_dentry,
 132                               struct dentry *dentry, struct super_block *sb)
 133 {
 134         struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb);
 135
 136         if (IS_ERR(inode))
 137                 return PTR_ERR(inode);
 138         d_instantiate(dentry, inode);
 139
 140         return 0;
 141 }
 142
 143 static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
 144                               struct inode *inode)
 145 {
 146         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 147         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 148         struct dentry *lower_dir_dentry;
 149         int rc;
 150
 151         dget(lower_dentry);
 152         lower_dir_dentry = lock_parent(lower_dentry);
 153         rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
 154         if (rc) {
 155                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 156                 goto out_unlock;
 157         }
 158         fsstack_copy_attr_times(dir, lower_dir_inode);
 159         set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
 160         inode->i_ctime = dir->i_ctime;
 161         d_drop(dentry);
 162 out_unlock:
 163         unlock_dir(lower_dir_dentry);
 164         dput(lower_dentry);
 165         return rc;
 166 }
 167
 168 /**
 169  * ecryptfs_do_create
 170  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
 171  * @ecryptfs_dentry: New file's dentry in ecryptfs
 172  * @mode: The mode of the new file
 173  *
 174  * Creates the underlying file and the eCryptfs inode which will link to
 175  * it. It will also update the eCryptfs directory inode to mimic the
 176  * stat of the lower directory inode.
 177  *
 178  * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
 179  */
 180 static struct inode *
 181 ecryptfs_do_create(struct inode *directory_inode,
 182                    struct dentry *ecryptfs_dentry, umode_t mode)
 183 {
 184         int rc;
 185         struct dentry *lower_dentry;
 186         struct dentry *lower_dir_dentry;
 187         struct inode *inode;
 188
 189         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 190         lower_dir_dentry = lock_parent(lower_dentry);
 191         rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true);
 192         if (rc) {
 193                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 194                        "rc = [%d]\n", __func__, rc);
 195                 inode = ERR_PTR(rc);
 196                 goto out_lock;
 197         }
 198         inode = __ecryptfs_get_inode(d_inode(lower_dentry),
 199                                      directory_inode->i_sb);
 200         if (IS_ERR(inode)) {
 201                 vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL);
 202                 goto out_lock;
 203         }
 204         fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry));
 205         fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry));
 206 out_lock:
 207         unlock_dir(lower_dir_dentry);
 208         return inode;
 209 }
 210
 211 /**
 212  * ecryptfs_initialize_file
 213  *
 214  * Cause the file to be changed from a basic empty file to an ecryptfs
 215  * file with a header and first data page.
 216  *
 217  * Returns zero on success
 218  */
 219 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
 220                              struct inode *ecryptfs_inode)
 221 {
 222         struct ecryptfs_crypt_stat *crypt_stat =
 223                 &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
 224         int rc = 0;
 225
 226         if (S_ISDIR(ecryptfs_inode->i_mode)) {
 227                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 228                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 229                 goto out;
 230         }
 231         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 232         rc = ecryptfs_new_file_context(ecryptfs_inode);
 233         if (rc) {
 234                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 235                                 "context; rc = [%d]\n", rc);
 236                 goto out;
 237         }
 238         rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
 239         if (rc) {
 240                 printk(KERN_ERR "%s: Error attempting to initialize "
 241                         "the lower file for the dentry with name "
 242                         "[%pd]; rc = [%d]\n", __func__,
 243                         ecryptfs_dentry, rc);
 244                 goto out;
 245         }
 246         rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
 247         if (rc)
 248                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 249         ecryptfs_put_lower_file(ecryptfs_inode);
 250 out:
 251         return rc;
 252 }
 253
 254 /**
 255  * ecryptfs_create
 256  * @dir: The inode of the directory in which to create the file.
 257  * @dentry: The eCryptfs dentry
 258  * @mode: The mode of the new file.
 259  *
 260  * Creates a new file.
 261  *
 262  * Returns zero on success; non-zero on error condition
 263  */
 264
 265
 266 static int
 267 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 268                 umode_t mode, bool excl)
 269 {
 270         struct inode *ecryptfs_inode;
 271         int rc;
 272         struct ecryptfs_crypt_stat *crypt_stat;
 273
 274         ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
 275                                             mode);
 276         if (IS_ERR(ecryptfs_inode)) {
 277                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 278                                 "lower filesystem\n");
 279                 rc = PTR_ERR(ecryptfs_inode);
 280                 goto out;
 281         }
 282
 283         /* At this point, a file exists on "disk"; we need to make sure
 284          * that this on disk file is prepared to be an ecryptfs file */
 285         rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
 286         if (rc) {
 287                 ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
 288                                    ecryptfs_inode);
 289                 make_bad_inode(ecryptfs_inode);
 290                 unlock_new_inode(ecryptfs_inode);
 291                 iput(ecryptfs_inode);
 292                 goto out;
 293         }
 294
 295         crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
 296         if (get_events() && get_events()->open_cb)
 297                         get_events()->open_cb(
 298                                 ecryptfs_inode_to_lower(ecryptfs_inode),
 299                                         crypt_stat);
 300
 301         unlock_new_inode(ecryptfs_inode);
 302         d_instantiate(ecryptfs_dentry, ecryptfs_inode);
 303 out:
 304         return rc;
 305 }
 306
 307 static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
 308 {
 309         struct ecryptfs_crypt_stat *crypt_stat;
 310         int rc;
 311
 312         rc = ecryptfs_get_lower_file(dentry, inode);
 313         if (rc) {
 314                 printk(KERN_ERR "%s: Error attempting to initialize "
 315                         "the lower file for the dentry with name "
 316                         "[%pd]; rc = [%d]\n", __func__,
 317                         dentry, rc);
 318                 return rc;
 319         }
 320
 321         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 322         /* TODO: lock for crypt_stat comparison */
 323         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 324                 ecryptfs_set_default_sizes(crypt_stat);
 325
 326         rc = ecryptfs_read_and_validate_header_region(inode);
 327         ecryptfs_put_lower_file(inode);
 328         if (rc) {
 329                 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
 330                 if (!rc)
 331                         crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 332         }
 333
 334         /* Must return 0 to allow non-eCryptfs files to be looked up, too */
 335         return 0;
 336 }
 337
 338 /**
 339  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
 340  */
 341 static int ecryptfs_lookup_interpose(struct dentry *dentry,
 342                                      struct dentry *lower_dentry,
 343                                      struct inode *dir_inode)
 344 {
 345         struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent);
 346         struct inode *inode, *lower_inode;
 347         struct ecryptfs_dentry_info *dentry_info;
 348         int rc = 0;
 349
 350         dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
 351         if (!dentry_info) {
 352                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 353                        "to allocate ecryptfs_dentry_info struct\n",
 354                         __func__);
 355                 dput(lower_dentry);
 356                 return -ENOMEM;
 357         }
 358
 359         fsstack_copy_attr_atime(dir_inode, d_inode(path->dentry));
 360         BUG_ON(!d_count(lower_dentry));
 361
 362         ecryptfs_set_dentry_private(dentry, dentry_info);
 363         dentry_info->lower_path.mnt = mntget(path->mnt);
 364         dentry_info->lower_path.dentry = lower_dentry;
 365
 366         /*
 367          * negative dentry can go positive under us here - its parent is not
 368          * locked.  That's OK and that could happen just as we return from
 369          * ecryptfs_lookup() anyway.  Just need to be careful and fetch
 370          * ->d_inode only once - it's not stable here.
 371          */
 372         lower_inode = READ_ONCE(lower_dentry->d_inode);
 373
 374         if (!lower_inode) {
 375                 /* We want to add because we couldn't find in lower */
 376                 d_add(dentry, NULL);
 377                 return 0;
 378         }
 379         inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
 380         if (IS_ERR(inode)) {
 381                 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
 382                        __func__, PTR_ERR(inode));
 383                 return PTR_ERR(inode);
 384         }
 385         if (S_ISREG(inode->i_mode)) {
 386                 rc = ecryptfs_i_size_read(dentry, inode);
 387                 if (rc) {
 388                         make_bad_inode(inode);
 389                         return rc;
 390                 }
 391         }
 392
 393         if (inode->i_state & I_NEW)
 394                 unlock_new_inode(inode);
 395         d_add(dentry, inode);
 396
 397         return rc;
 398 }
 399
 400 /**
 401  * ecryptfs_lookup
 402  * @ecryptfs_dir_inode: The eCryptfs directory inode
 403  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 404  * @flags: lookup flags
 405  *
 406  * Find a file on disk. If the file does not exist, then we'll add it to the
 407  * dentry cache and continue on to read it from the disk.
 408  */
 409 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 410                                       struct dentry *ecryptfs_dentry,
 411                                       unsigned int flags)
 412 {
 413         char *encrypted_and_encoded_name = NULL;
 414         size_t encrypted_and_encoded_name_size;
 415         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 416         struct dentry *lower_dir_dentry, *lower_dentry;
 417         int rc = 0;
 418
 419         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 420         mutex_lock(&d_inode(lower_dir_dentry)->i_mutex);
 421         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 422                                       lower_dir_dentry,
 423                                       ecryptfs_dentry->d_name.len);
 424         mutex_unlock(&d_inode(lower_dir_dentry)->i_mutex);
 425         if (IS_ERR(lower_dentry)) {
 426                 rc = PTR_ERR(lower_dentry);
 427                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 428                                 "[%d] on lower_dentry = [%pd]\n", __func__, rc,
 429                                 ecryptfs_dentry);
 430                 goto out;
 431         }
 432         if (d_really_is_positive(lower_dentry))
 433                 goto interpose;
 434         mount_crypt_stat = &ecryptfs_superblock_to_private(
 435                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 436         if (!(mount_crypt_stat
 437             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 438                 goto interpose;
 439         dput(lower_dentry);
 440         rc = ecryptfs_encrypt_and_encode_filename(
 441                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 442                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 443                 ecryptfs_dentry->d_name.len);
 444         if (rc) {
 445                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 446                        "filename; rc = [%d]\n", __func__, rc);
 447                 goto out;
 448         }
 449         mutex_lock(&d_inode(lower_dir_dentry)->i_mutex);
 450         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 451                                       lower_dir_dentry,
 452                                       encrypted_and_encoded_name_size);
 453         mutex_unlock(&d_inode(lower_dir_dentry)->i_mutex);
 454         if (IS_ERR(lower_dentry)) {
 455                 rc = PTR_ERR(lower_dentry);
 456                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 457                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 458                                 encrypted_and_encoded_name);
 459                 goto out;
 460         }
 461 interpose:
 462         rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
 463                                        ecryptfs_dir_inode);
 464 out:
 465         kfree(encrypted_and_encoded_name);
 466         return ERR_PTR(rc);
 467 }
 468
 469 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 470                          struct dentry *new_dentry)
 471 {
 472         struct dentry *lower_old_dentry;
 473         struct dentry *lower_new_dentry;
 474         struct dentry *lower_dir_dentry;
 475         u64 file_size_save;
 476         int rc;
 477
 478         file_size_save = i_size_read(d_inode(old_dentry));
 479         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 480         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 481         dget(lower_old_dentry);
 482         dget(lower_new_dentry);
 483         lower_dir_dentry = lock_parent(lower_new_dentry);
 484         rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry),
 485                       lower_new_dentry, NULL);
 486         if (rc || d_really_is_negative(lower_new_dentry))
 487                 goto out_lock;
 488         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
 489         if (rc)
 490                 goto out_lock;
 491         fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
 492         fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
 493         set_nlink(d_inode(old_dentry),
 494                   ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink);
 495         i_size_write(d_inode(new_dentry), file_size_save);
 496 out_lock:
 497         unlock_dir(lower_dir_dentry);
 498         dput(lower_new_dentry);
 499         dput(lower_old_dentry);
 500         return rc;
 501 }
 502
 503 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 504 {
 505         return ecryptfs_do_unlink(dir, dentry, d_inode(dentry));
 506 }
 507
 508 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 509                             const char *symname)
 510 {
 511         int rc;
 512         struct dentry *lower_dentry;
 513         struct dentry *lower_dir_dentry;
 514         char *encoded_symname;
 515         size_t encoded_symlen;
 516         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 517
 518         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 519         dget(lower_dentry);
 520         lower_dir_dentry = lock_parent(lower_dentry);
 521         mount_crypt_stat = &ecryptfs_superblock_to_private(
 522                 dir->i_sb)->mount_crypt_stat;
 523         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 524                                                   &encoded_symlen,
 525                                                   NULL,
 526                                                   mount_crypt_stat, symname,
 527                                                   strlen(symname));
 528         if (rc)
 529                 goto out_lock;
 530         rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry,
 531                          encoded_symname);
 532         kfree(encoded_symname);
 533         if (rc || d_really_is_negative(lower_dentry))
 534                 goto out_lock;
 535         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 536         if (rc)
 537                 goto out_lock;
 538         fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
 539         fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
 540 out_lock:
 541         unlock_dir(lower_dir_dentry);
 542         dput(lower_dentry);
 543         if (d_really_is_negative(dentry))
 544                 d_drop(dentry);
 545         return rc;
 546 }
 547
 548 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 549 {
 550         int rc;
 551         struct dentry *lower_dentry;
 552         struct dentry *lower_dir_dentry;
 553
 554         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 555         lower_dir_dentry = lock_parent(lower_dentry);
 556         rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode);
 557         if (rc || d_really_is_negative(lower_dentry))
 558                 goto out;
 559         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 560         if (rc)
 561                 goto out;
 562         fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
 563         fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
 564         set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink);
 565 out:
 566         unlock_dir(lower_dir_dentry);
 567         if (d_really_is_negative(dentry))
 568                 d_drop(dentry);
 569         return rc;
 570 }
 571
 572 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 573 {
 574         struct dentry *lower_dentry;
 575         struct dentry *lower_dir_dentry;
 576         int rc;
 577
 578         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 579         dget(dentry);
 580         lower_dir_dentry = lock_parent(lower_dentry);
 581         dget(lower_dentry);
 582         rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry);
 583         dput(lower_dentry);
 584         if (!rc && d_really_is_positive(dentry))
 585                 clear_nlink(d_inode(dentry));
 586         fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
 587         set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink);
 588         unlock_dir(lower_dir_dentry);
 589         if (!rc)
 590                 d_drop(dentry);
 591         dput(dentry);
 592         return rc;
 593 }
 594
 595 static int
 596 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
 597 {
 598         int rc;
 599         struct dentry *lower_dentry;
 600         struct dentry *lower_dir_dentry;
 601
 602         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 603         lower_dir_dentry = lock_parent(lower_dentry);
 604         rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev);
 605         if (rc || d_really_is_negative(lower_dentry))
 606                 goto out;
 607         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 608         if (rc)
 609                 goto out;
 610         fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
 611         fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
 612 out:
 613         unlock_dir(lower_dir_dentry);
 614         if (d_really_is_negative(dentry))
 615                 d_drop(dentry);
 616         return rc;
 617 }
 618
 619 static int
 620 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 621                 struct inode *new_dir, struct dentry *new_dentry)
 622 {
 623         int rc;
 624         struct dentry *lower_old_dentry;
 625         struct dentry *lower_new_dentry;
 626         struct dentry *lower_old_dir_dentry;
 627         struct dentry *lower_new_dir_dentry;
 628         struct dentry *trap = NULL;
 629         struct inode *target_inode;
 630
 631         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 632         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 633         dget(lower_old_dentry);
 634         dget(lower_new_dentry);
 635         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 636         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 637         target_inode = d_inode(new_dentry);
 638         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 639         /* source should not be ancestor of target */
 640         if (trap == lower_old_dentry) {
 641                 rc = -EINVAL;
 642                 goto out_lock;
 643         }
 644         /* target should not be ancestor of source */
 645         if (trap == lower_new_dentry) {
 646                 rc = -ENOTEMPTY;
 647                 goto out_lock;
 648         }
 649         rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry,
 650                         d_inode(lower_new_dir_dentry), lower_new_dentry,
 651                         NULL, 0);
 652         if (rc)
 653                 goto out_lock;
 654         if (target_inode)
 655                 fsstack_copy_attr_all(target_inode,
 656                                       ecryptfs_inode_to_lower(target_inode));
 657         fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry));
 658         if (new_dir != old_dir)
 659                 fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry));
 660 out_lock:
 661         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 662         dput(lower_new_dir_dentry);
 663         dput(lower_old_dir_dentry);
 664         dput(lower_new_dentry);
 665         dput(lower_old_dentry);
 666         return rc;
 667 }
 668
 669 static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz)
 670 {
 671         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 672         char *lower_buf;
 673         char *buf;
 674         mm_segment_t old_fs;
 675         int rc;
 676
 677         lower_buf = kmalloc(PATH_MAX, GFP_KERNEL);
 678         if (!lower_buf)
 679                 return ERR_PTR(-ENOMEM);
 680         old_fs = get_fs();
 681         set_fs(get_ds());
 682         rc = d_inode(lower_dentry)->i_op->readlink(lower_dentry,
 683                                                    (char __user *)lower_buf,
 684                                                    PATH_MAX);
 685         set_fs(old_fs);
 686         if (rc < 0)
 687                 goto out;
 688         rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb,
 689                                                   lower_buf, rc);
 690 out:
 691         kfree(lower_buf);
 692         return rc ? ERR_PTR(rc) : buf;
 693 }
 694
 695 static const char *ecryptfs_follow_link(struct dentry *dentry, void **cookie)
 696 {
 697         size_t len;
 698         char *buf = ecryptfs_readlink_lower(dentry, &len);
 699         if (IS_ERR(buf))
 700                 return buf;
 701         fsstack_copy_attr_atime(d_inode(dentry),
 702                                 d_inode(ecryptfs_dentry_to_lower(dentry)));
 703         buf[len] = '\0';
 704         return *cookie = buf;
 705 }
 706
 707 /**
 708  * upper_size_to_lower_size
 709  * @crypt_stat: Crypt_stat associated with file
 710  * @upper_size: Size of the upper file
 711  *
 712  * Calculate the required size of the lower file based on the
 713  * specified size of the upper file. This calculation is based on the
 714  * number of headers in the underlying file and the extent size.
 715  *
 716  * Returns Calculated size of the lower file.
 717  */
 718 static loff_t
 719 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 720                          loff_t upper_size)
 721 {
 722         loff_t lower_size;
 723
 724         lower_size = ecryptfs_lower_header_size(crypt_stat);
 725         if (upper_size != 0) {
 726                 loff_t num_extents;
 727
 728                 num_extents = upper_size >> crypt_stat->extent_shift;
 729                 if (upper_size & ~crypt_stat->extent_mask)
 730                         num_extents++;
 731                 lower_size += (num_extents * crypt_stat->extent_size);
 732         }
 733         return lower_size;
 734 }
 735
 736 /**
 737  * truncate_upper
 738  * @dentry: The ecryptfs layer dentry
 739  * @ia: Address of the ecryptfs inode's attributes
 740  * @lower_ia: Address of the lower inode's attributes
 741  *
 742  * Function to handle truncations modifying the size of the file. Note
 743  * that the file sizes are interpolated. When expanding, we are simply
 744  * writing strings of 0's out. When truncating, we truncate the upper
 745  * inode and update the lower_ia according to the page index
 746  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 747  * the caller must use lower_ia in a call to notify_change() to perform
 748  * the truncation of the lower inode.
 749  *
 750  * Returns zero on success; non-zero otherwise
 751  */
 752 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 753                           struct iattr *lower_ia)
 754 {
 755         int rc = 0;
 756         struct inode *inode = d_inode(dentry);
 757         struct ecryptfs_crypt_stat *crypt_stat;
 758         loff_t i_size = i_size_read(inode);
 759         loff_t lower_size_before_truncate;
 760         loff_t lower_size_after_truncate;
 761
 762         if (unlikely((ia->ia_size == i_size))) {
 763                 lower_ia->ia_valid &= ~ATTR_SIZE;
 764                 return 0;
 765         }
 766         rc = ecryptfs_get_lower_file(dentry, inode);
 767         if (rc)
 768                 return rc;
 769         crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
 770         /* Switch on growing or shrinking file */
 771         if (ia->ia_size > i_size) {
 772                 char zero[] = { 0x00 };
 773
 774                 lower_ia->ia_valid &= ~ATTR_SIZE;
 775                 /* Write a single 0 at the last position of the file;
 776                  * this triggers code that will fill in 0's throughout
 777                  * the intermediate portion of the previous end of the
 778                  * file and the new and of the file */
 779                 rc = ecryptfs_write(inode, zero,
 780                                     (ia->ia_size - 1), 1);
 781         } else { /* ia->ia_size < i_size_read(inode) */
 782                 /* We're chopping off all the pages down to the page
 783                  * in which ia->ia_size is located. Fill in the end of
 784                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 785                  * PAGE_CACHE_SIZE with zeros. */
 786                 size_t num_zeros = (PAGE_CACHE_SIZE
 787                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 788
 789                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 790                         truncate_setsize(inode, ia->ia_size);
 791                         lower_ia->ia_size = ia->ia_size;
 792                         lower_ia->ia_valid |= ATTR_SIZE;
 793                         goto out;
 794                 }
 795                 if (num_zeros) {
 796                         char *zeros_virt;
 797
 798                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 799                         if (!zeros_virt) {
 800                                 rc = -ENOMEM;
 801                                 goto out;
 802                         }
 803                         rc = ecryptfs_write(inode, zeros_virt,
 804                                             ia->ia_size, num_zeros);
 805                         kfree(zeros_virt);
 806                         if (rc) {
 807                                 printk(KERN_ERR "Error attempting to zero out "
 808                                        "the remainder of the end page on "
 809                                        "reducing truncate; rc = [%d]\n", rc);
 810                                 goto out;
 811                         }
 812                 }
 813                 truncate_setsize(inode, ia->ia_size);
 814                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 815                 if (rc) {
 816                         printk(KERN_ERR "Problem with "
 817                                "ecryptfs_write_inode_size_to_metadata; "
 818                                "rc = [%d]\n", rc);
 819                         goto out;
 820                 }
 821                 /* We are reducing the size of the ecryptfs file, and need to
 822                  * know if we need to reduce the size of the lower file. */
 823                 lower_size_before_truncate =
 824                     upper_size_to_lower_size(crypt_stat, i_size);
 825                 lower_size_after_truncate =
 826                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 827                 if (lower_size_after_truncate < lower_size_before_truncate) {
 828                         lower_ia->ia_size = lower_size_after_truncate;
 829                         lower_ia->ia_valid |= ATTR_SIZE;
 830                 } else
 831                         lower_ia->ia_valid &= ~ATTR_SIZE;
 832         }
 833 out:
 834         ecryptfs_put_lower_file(inode);
 835         return rc;
 836 }
 837
 838 static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
 839 {
 840         struct ecryptfs_crypt_stat *crypt_stat;
 841         loff_t lower_oldsize, lower_newsize;
 842
 843         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 844         lower_oldsize = upper_size_to_lower_size(crypt_stat,
 845                                                  i_size_read(inode));
 846         lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
 847         if (lower_newsize > lower_oldsize) {
 848                 /*
 849                  * The eCryptfs inode and the new *lower* size are mixed here
 850                  * because we may not have the lower i_mutex held and/or it may
 851                  * not be appropriate to call inode_newsize_ok() with inodes
 852                  * from other filesystems.
 853                  */
 854                 return inode_newsize_ok(inode, lower_newsize);
 855         }
 856
 857         return 0;
 858 }
 859
 860 /**
 861  * ecryptfs_truncate
 862  * @dentry: The ecryptfs layer dentry
 863  * @new_length: The length to expand the file to
 864  *
 865  * Simple function that handles the truncation of an eCryptfs inode and
 866  * its corresponding lower inode.
 867  *
 868  * Returns zero on success; non-zero otherwise
 869  */
 870 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 871 {
 872         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 873         struct iattr lower_ia = { .ia_valid = 0 };
 874         int rc;
 875
 876         rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length);
 877         if (rc)
 878                 return rc;
 879
 880         rc = truncate_upper(dentry, &ia, &lower_ia);
 881         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 882                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 883
 884                 mutex_lock(&d_inode(lower_dentry)->i_mutex);
 885                 rc = notify_change(lower_dentry, &lower_ia, NULL);
 886                 mutex_unlock(&d_inode(lower_dentry)->i_mutex);
 887         }
 888         return rc;
 889 }
 890
 891 static int
 892 ecryptfs_permission(struct inode *inode, int mask)
 893 {
 894         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 895 }
 896
 897 /**
 898  * ecryptfs_setattr
 899  * @dentry: dentry handle to the inode to modify
 900  * @ia: Structure with flags of what to change and values
 901  *
 902  * Updates the metadata of an inode. If the update is to the size
 903  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 904  * of both the ecryptfs inode and the lower inode.
 905  *
 906  * All other metadata changes will be passed right to the lower filesystem,
 907  * and we will just update our inode to look like the lower.
 908  */
 909 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 910 {
 911         int rc = 0;
 912         struct dentry *lower_dentry;
 913         struct iattr lower_ia;
 914         struct inode *inode;
 915         struct inode *lower_inode;
 916         struct ecryptfs_crypt_stat *crypt_stat;
 917
 918         crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
 919         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 920                 ecryptfs_init_crypt_stat(crypt_stat);
 921         inode = d_inode(dentry);
 922         lower_inode = ecryptfs_inode_to_lower(inode);
 923         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 924         mutex_lock(&crypt_stat->cs_mutex);
 925         if (d_is_dir(dentry))
 926                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 927         else if (d_is_reg(dentry)
 928                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 929                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 930                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 931
 932                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 933                         dentry->d_sb)->mount_crypt_stat;
 934                 rc = ecryptfs_get_lower_file(dentry, inode);
 935                 if (rc) {
 936                         mutex_unlock(&crypt_stat->cs_mutex);
 937                         goto out;
 938                 }
 939                 rc = ecryptfs_read_metadata(dentry);
 940                 ecryptfs_put_lower_file(inode);
 941                 if (rc) {
 942                         if (!(mount_crypt_stat->flags
 943                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 944                                 rc = -EIO;
 945                                 printk(KERN_WARNING "Either the lower file "
 946                                        "is not in a valid eCryptfs format, "
 947                                        "or the key could not be retrieved. "
 948                                        "Plaintext passthrough mode is not "
 949                                        "enabled; returning -EIO\n");
 950                                 mutex_unlock(&crypt_stat->cs_mutex);
 951                                 goto out;
 952                         }
 953                         rc = 0;
 954                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
 955                                                | ECRYPTFS_ENCRYPTED);
 956                 }
 957         }
 958         mutex_unlock(&crypt_stat->cs_mutex);
 959
 960         rc = inode_change_ok(inode, ia);
 961         if (rc)
 962                 goto out;
 963         if (ia->ia_valid & ATTR_SIZE) {
 964                 rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
 965                 if (rc)
 966                         goto out;
 967         }
 968
 969         memcpy(&lower_ia, ia, sizeof(lower_ia));
 970         if (ia->ia_valid & ATTR_FILE)
 971                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 972         if (ia->ia_valid & ATTR_SIZE) {
 973                 rc = truncate_upper(dentry, ia, &lower_ia);
 974                 if (rc < 0)
 975                         goto out;
 976         }
 977
 978         /*
 979          * mode change is for clearing setuid/setgid bits. Allow lower fs
 980          * to interpret this in its own way.
 981          */
 982         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
 983                 lower_ia.ia_valid &= ~ATTR_MODE;
 984
 985         mutex_lock(&d_inode(lower_dentry)->i_mutex);
 986         rc = notify_change(lower_dentry, &lower_ia, NULL);
 987         mutex_unlock(&d_inode(lower_dentry)->i_mutex);
 988 out:
 989         fsstack_copy_attr_all(inode, lower_inode);
 990         return rc;
 991 }
 992
 993 static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
 994                                  struct kstat *stat)
 995 {
 996         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 997         int rc = 0;
 998
 999         mount_crypt_stat = &ecryptfs_superblock_to_private(
1000                                                 dentry->d_sb)->mount_crypt_stat;
1001         generic_fillattr(d_inode(dentry), stat);
1002         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1003                 char *target;
1004                 size_t targetsiz;
1005
1006                 target = ecryptfs_readlink_lower(dentry, &targetsiz);
1007                 if (!IS_ERR(target)) {
1008                         kfree(target);
1009                         stat->size = targetsiz;
1010                 } else {
1011                         rc = PTR_ERR(target);
1012                 }
1013         }
1014         return rc;
1015 }
1016
1017 static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1018                             struct kstat *stat)
1019 {
1020         struct kstat lower_stat;
1021         int rc;
1022
1023         rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat);
1024         if (!rc) {
1025                 fsstack_copy_attr_all(d_inode(dentry),
1026                                       ecryptfs_inode_to_lower(d_inode(dentry)));
1027                 generic_fillattr(d_inode(dentry), 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 (!d_inode(lower_dentry)->i_op->setxattr) {
1042                 rc = -EOPNOTSUPP;
1043                 goto out;
1044         }
1045
1046         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1047         if (!rc && d_really_is_positive(dentry))
1048                 fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry));
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 (!d_inode(lower_dentry)->i_op->getxattr) {
1060                 rc = -EOPNOTSUPP;
1061                 goto out;
1062         }
1063         mutex_lock(&d_inode(lower_dentry)->i_mutex);
1064         rc = d_inode(lower_dentry)->i_op->getxattr(lower_dentry, name, value,
1065                                                    size);
1066         mutex_unlock(&d_inode(lower_dentry)->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 (!d_inode(lower_dentry)->i_op->listxattr) {
1087                 rc = -EOPNOTSUPP;
1088                 goto out;
1089         }
1090         mutex_lock(&d_inode(lower_dentry)->i_mutex);
1091         rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size);
1092         mutex_unlock(&d_inode(lower_dentry)->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 (!d_inode(lower_dentry)->i_op->removexattr) {
1104                 rc = -EOPNOTSUPP;
1105                 goto out;
1106         }
1107         mutex_lock(&d_inode(lower_dentry)->i_mutex);
1108         rc = d_inode(lower_dentry)->i_op->removexattr(lower_dentry, name);
1109         mutex_unlock(&d_inode(lower_dentry)->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 = kfree_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 };