fs/ecryptfs/inode.c

   1 /**
   2  * eCryptfs: Linux filesystem encryption layer
   3  *
   4  * Copyright (C) 1997-2004 Erez Zadok
   5  * Copyright (C) 2001-2004 Stony Brook University
   6  * Copyright (C) 2004-2007 International Business Machines Corp.
   7  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
   8  *              Michael C. Thompsion <mcthomps@us.ibm.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of the
  13  * License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  23  * 02111-1307, USA.
  24  */
  25
  26 #include <linux/file.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/pagemap.h>
  29 #include <linux/dcache.h>
  30 #include <linux/namei.h>
  31 #include <linux/mount.h>
  32 #include <linux/crypto.h>
  33 #include <linux/fs_stack.h>
  34 #include <linux/slab.h>
  35 #include <linux/xattr.h>
  36 #include <asm/unaligned.h>
  37 #include "ecryptfs_kernel.h"
  38
  39 static struct dentry *lock_parent(struct dentry *dentry)
  40 {
  41         struct dentry *dir;
  42
  43         dir = dget_parent(dentry);
  44         mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
  45         return dir;
  46 }
  47
  48 static void unlock_dir(struct dentry *dir)
  49 {
  50         mutex_unlock(&dir->d_inode->i_mutex);
  51         dput(dir);
  52 }
  53
  54 static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
  55 {
  56         if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode)
  57                 return 1;
  58         return 0;
  59 }
  60
  61 static int ecryptfs_inode_set(struct inode *inode, void *opaque)
  62 {
  63         struct inode *lower_inode = opaque;
  64
  65         ecryptfs_set_inode_lower(inode, lower_inode);
  66         fsstack_copy_attr_all(inode, lower_inode);
  67         /* i_size will be overwritten for encrypted regular files */
  68         fsstack_copy_inode_size(inode, lower_inode);
  69         inode->i_ino = lower_inode->i_ino;
  70         inode->i_version++;
  71         inode->i_mapping->a_ops = &ecryptfs_aops;
  72
  73         if (S_ISLNK(inode->i_mode))
  74                 inode->i_op = &ecryptfs_symlink_iops;
  75         else if (S_ISDIR(inode->i_mode))
  76                 inode->i_op = &ecryptfs_dir_iops;
  77         else
  78                 inode->i_op = &ecryptfs_main_iops;
  79
  80         if (S_ISDIR(inode->i_mode))
  81                 inode->i_fop = &ecryptfs_dir_fops;
  82         else if (special_file(inode->i_mode))
  83                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  84         else
  85                 inode->i_fop = &ecryptfs_main_fops;
  86
  87         return 0;
  88 }
  89
  90 static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
  91                                           struct super_block *sb)
  92 {
  93         struct inode *inode;
  94
  95         if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
  96                 return ERR_PTR(-EXDEV);
  97         if (!igrab(lower_inode))
  98                 return ERR_PTR(-ESTALE);
  99         inode = iget5_locked(sb, (unsigned long)lower_inode,
 100                              ecryptfs_inode_test, ecryptfs_inode_set,
 101                              lower_inode);
 102         if (!inode) {
 103                 iput(lower_inode);
 104                 return ERR_PTR(-EACCES);
 105         }
 106         if (!(inode->i_state & I_NEW))
 107                 iput(lower_inode);
 108
 109         return inode;
 110 }
 111
 112 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 113                                  struct super_block *sb)
 114 {
 115         struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
 116
 117         if (!IS_ERR(inode) && (inode->i_state & I_NEW))
 118                 unlock_new_inode(inode);
 119
 120         return inode;
 121 }
 122
 123 /**
 124  * ecryptfs_interpose
 125  * @lower_dentry: Existing dentry in the lower filesystem
 126  * @dentry: ecryptfs' dentry
 127  * @sb: ecryptfs's super_block
 128  *
 129  * Interposes upper and lower dentries.
 130  *
 131  * Returns zero on success; non-zero otherwise
 132  */
 133 static int ecryptfs_interpose(struct dentry *lower_dentry,
 134                               struct dentry *dentry, struct super_block *sb)
 135 {
 136         struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb);
 137
 138         if (IS_ERR(inode))
 139                 return PTR_ERR(inode);
 140         d_instantiate(dentry, inode);
 141
 142         return 0;
 143 }
 144
 145 /**
 146  * ecryptfs_create_underlying_file
 147  * @lower_dir_inode: inode of the parent in the lower fs of the new file
 148  * @dentry: New file's dentry
 149  * @mode: The mode of the new file
 150  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 151  *
 152  * Creates the file in the lower file system.
 153  *
 154  * Returns zero on success; non-zero on error condition
 155  */
 156 static int
 157 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
 158                                 struct dentry *dentry, int mode,
 159                                 struct nameidata *nd)
 160 {
 161         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 162         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
 163         struct dentry *dentry_save;
 164         struct vfsmount *vfsmount_save;
 165         unsigned int flags_save;
 166         int rc;
 167
 168         if (nd) {
 169                 dentry_save = nd->path.dentry;
 170                 vfsmount_save = nd->path.mnt;
 171                 flags_save = nd->flags;
 172                 nd->path.dentry = lower_dentry;
 173                 nd->path.mnt = lower_mnt;
 174                 nd->flags &= ~LOOKUP_OPEN;
 175         }
 176         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
 177         if (nd) {
 178                 nd->path.dentry = dentry_save;
 179                 nd->path.mnt = vfsmount_save;
 180                 nd->flags = flags_save;
 181         }
 182         return rc;
 183 }
 184
 185 /**
 186  * ecryptfs_do_create
 187  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
 188  * @ecryptfs_dentry: New file's dentry in ecryptfs
 189  * @mode: The mode of the new file
 190  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 191  *
 192  * Creates the underlying file and the eCryptfs inode which will link to
 193  * it. It will also update the eCryptfs directory inode to mimic the
 194  * stat of the lower directory inode.
 195  *
 196  * Returns zero on success; non-zero on error condition
 197  */
 198 static int
 199 ecryptfs_do_create(struct inode *directory_inode,
 200                    struct dentry *ecryptfs_dentry, int mode,
 201                    struct nameidata *nd)
 202 {
 203         int rc;
 204         struct dentry *lower_dentry;
 205         struct dentry *lower_dir_dentry;
 206
 207         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 208         lower_dir_dentry = lock_parent(lower_dentry);
 209         if (IS_ERR(lower_dir_dentry)) {
 210                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 211                                 "dentry\n");
 212                 rc = PTR_ERR(lower_dir_dentry);
 213                 goto out;
 214         }
 215         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 216                                              ecryptfs_dentry, mode, nd);
 217         if (rc) {
 218                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 219                        "rc = [%d]\n", __func__, rc);
 220                 goto out_lock;
 221         }
 222         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 223                                 directory_inode->i_sb);
 224         if (rc) {
 225                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 226                 goto out_lock;
 227         }
 228         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 229         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 230 out_lock:
 231         unlock_dir(lower_dir_dentry);
 232 out:
 233         return rc;
 234 }
 235
 236 /**
 237  * ecryptfs_initialize_file
 238  *
 239  * Cause the file to be changed from a basic empty file to an ecryptfs
 240  * file with a header and first data page.
 241  *
 242  * Returns zero on success
 243  */
 244 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 245 {
 246         struct ecryptfs_crypt_stat *crypt_stat =
 247                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 248         int rc = 0;
 249
 250         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 251                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 252                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 253                 goto out;
 254         }
 255         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 256         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 257         if (rc) {
 258                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 259                                 "context; rc = [%d]\n", rc);
 260                 goto out;
 261         }
 262         rc = ecryptfs_get_lower_file(ecryptfs_dentry,
 263                                      ecryptfs_dentry->d_inode);
 264         if (rc) {
 265                 printk(KERN_ERR "%s: Error attempting to initialize "
 266                         "the lower file for the dentry with name "
 267                         "[%s]; rc = [%d]\n", __func__,
 268                         ecryptfs_dentry->d_name.name, rc);
 269                 goto out;
 270         }
 271         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 272         if (rc)
 273                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 274         ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 275 out:
 276         return rc;
 277 }
 278
 279 /**
 280  * ecryptfs_create
 281  * @dir: The inode of the directory in which to create the file.
 282  * @dentry: The eCryptfs dentry
 283  * @mode: The mode of the new file.
 284  * @nd: nameidata
 285  *
 286  * Creates a new file.
 287  *
 288  * Returns zero on success; non-zero on error condition
 289  */
 290 static int
 291 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 292                 int mode, struct nameidata *nd)
 293 {
 294         int rc;
 295
 296         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 297         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 298         if (unlikely(rc)) {
 299                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 300                                 "lower filesystem\n");
 301                 goto out;
 302         }
 303         /* At this point, a file exists on "disk"; we need to make sure
 304          * that this on disk file is prepared to be an ecryptfs file */
 305         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 306 out:
 307         return rc;
 308 }
 309
 310 /**
 311  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
 312  */
 313 static int ecryptfs_lookup_interpose(struct dentry *ecryptfs_dentry,
 314                                      struct dentry *lower_dentry,
 315                                      struct inode *ecryptfs_dir_inode)
 316 {
 317         struct dentry *lower_dir_dentry;
 318         struct vfsmount *lower_mnt;
 319         struct inode *inode, *lower_inode;
 320         struct ecryptfs_crypt_stat *crypt_stat;
 321         char *page_virt = NULL;
 322         int put_lower = 0, rc = 0;
 323
 324         lower_dir_dentry = lower_dentry->d_parent;
 325         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 326                                    ecryptfs_dentry->d_parent));
 327         lower_inode = lower_dentry->d_inode;
 328         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
 329         BUG_ON(!lower_dentry->d_count);
 330         ecryptfs_set_dentry_private(ecryptfs_dentry,
 331                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
 332                                                      GFP_KERNEL));
 333         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
 334                 rc = -ENOMEM;
 335                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 336                        "to allocate ecryptfs_dentry_info struct\n",
 337                         __func__);
 338                 goto out_put;
 339         }
 340         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 341         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
 342         if (!lower_dentry->d_inode) {
 343                 /* We want to add because we couldn't find in lower */
 344                 d_add(ecryptfs_dentry, NULL);
 345                 goto out;
 346         }
 347         inode = __ecryptfs_get_inode(lower_inode, ecryptfs_dir_inode->i_sb);
 348         if (IS_ERR(inode)) {
 349                 rc = PTR_ERR(inode);
 350                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
 351                        __func__, rc);
 352                 goto out;
 353         }
 354         if (!S_ISREG(inode->i_mode)) {
 355                 if (inode->i_state & I_NEW)
 356                         unlock_new_inode(inode);
 357                 d_add(ecryptfs_dentry, inode);
 358                 goto out;
 359         }
 360         /* Released in this function */
 361         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
 362         if (!page_virt) {
 363                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
 364                        __func__);
 365                 rc = -ENOMEM;
 366                 make_bad_inode(inode);
 367                 goto out;
 368         }
 369         rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
 370         if (rc) {
 371                 printk(KERN_ERR "%s: Error attempting to initialize "
 372                         "the lower file for the dentry with name "
 373                         "[%s]; rc = [%d]\n", __func__,
 374                         ecryptfs_dentry->d_name.name, rc);
 375                 make_bad_inode(inode);
 376                 goto out_free_kmem;
 377         }
 378         put_lower = 1;
 379         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 380         /* TODO: lock for crypt_stat comparison */
 381         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 382                         ecryptfs_set_default_sizes(crypt_stat);
 383         rc = ecryptfs_read_and_validate_header_region(page_virt, inode);
 384         if (rc) {
 385                 memset(page_virt, 0, PAGE_CACHE_SIZE);
 386                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 387                                                              inode);
 388                 if (rc) {
 389                         rc = 0;
 390                         goto unlock_inode;
 391                 }
 392                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 393         }
 394         ecryptfs_i_size_init(page_virt, inode);
 395 unlock_inode:
 396         if (inode->i_state & I_NEW)
 397                 unlock_new_inode(inode);
 398         d_add(ecryptfs_dentry, inode);
 399 out_free_kmem:
 400         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 401         goto out;
 402 out_put:
 403         dput(lower_dentry);
 404         mntput(lower_mnt);
 405         d_drop(ecryptfs_dentry);
 406 out:
 407         if (put_lower)
 408                 ecryptfs_put_lower_file(inode);
 409         return rc;
 410 }
 411
 412 /**
 413  * ecryptfs_lookup
 414  * @ecryptfs_dir_inode: The eCryptfs directory inode
 415  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 416  * @ecryptfs_nd: nameidata; may be NULL
 417  *
 418  * Find a file on disk. If the file does not exist, then we'll add it to the
 419  * dentry cache and continue on to read it from the disk.
 420  */
 421 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 422                                       struct dentry *ecryptfs_dentry,
 423                                       struct nameidata *ecryptfs_nd)
 424 {
 425         char *encrypted_and_encoded_name = NULL;
 426         size_t encrypted_and_encoded_name_size;
 427         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 428         struct dentry *lower_dir_dentry, *lower_dentry;
 429         int rc = 0;
 430
 431         if ((ecryptfs_dentry->d_name.len == 1
 432              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 433             || (ecryptfs_dentry->d_name.len == 2
 434                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 435                 goto out_d_drop;
 436         }
 437         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 438         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 439         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 440                                       lower_dir_dentry,
 441                                       ecryptfs_dentry->d_name.len);
 442         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 443         if (IS_ERR(lower_dentry)) {
 444                 rc = PTR_ERR(lower_dentry);
 445                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 446                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 447                                 encrypted_and_encoded_name);
 448                 goto out_d_drop;
 449         }
 450         if (lower_dentry->d_inode)
 451                 goto interpose;
 452         mount_crypt_stat = &ecryptfs_superblock_to_private(
 453                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 454         if (!(mount_crypt_stat
 455             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 456                 goto interpose;
 457         dput(lower_dentry);
 458         rc = ecryptfs_encrypt_and_encode_filename(
 459                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 460                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 461                 ecryptfs_dentry->d_name.len);
 462         if (rc) {
 463                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 464                        "filename; rc = [%d]\n", __func__, rc);
 465                 goto out_d_drop;
 466         }
 467         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 468         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 469                                       lower_dir_dentry,
 470                                       encrypted_and_encoded_name_size);
 471         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 472         if (IS_ERR(lower_dentry)) {
 473                 rc = PTR_ERR(lower_dentry);
 474                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 475                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 476                                 encrypted_and_encoded_name);
 477                 goto out_d_drop;
 478         }
 479 interpose:
 480         rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
 481                                        ecryptfs_dir_inode);
 482         goto out;
 483 out_d_drop:
 484         d_drop(ecryptfs_dentry);
 485 out:
 486         kfree(encrypted_and_encoded_name);
 487         return ERR_PTR(rc);
 488 }
 489
 490 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 491                          struct dentry *new_dentry)
 492 {
 493         struct dentry *lower_old_dentry;
 494         struct dentry *lower_new_dentry;
 495         struct dentry *lower_dir_dentry;
 496         u64 file_size_save;
 497         int rc;
 498
 499         file_size_save = i_size_read(old_dentry->d_inode);
 500         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 501         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 502         dget(lower_old_dentry);
 503         dget(lower_new_dentry);
 504         lower_dir_dentry = lock_parent(lower_new_dentry);
 505         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 506                       lower_new_dentry);
 507         if (rc || !lower_new_dentry->d_inode)
 508                 goto out_lock;
 509         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
 510         if (rc)
 511                 goto out_lock;
 512         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 513         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 514         old_dentry->d_inode->i_nlink =
 515                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 516         i_size_write(new_dentry->d_inode, file_size_save);
 517 out_lock:
 518         unlock_dir(lower_dir_dentry);
 519         dput(lower_new_dentry);
 520         dput(lower_old_dentry);
 521         return rc;
 522 }
 523
 524 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 525 {
 526         int rc = 0;
 527         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 528         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 529         struct dentry *lower_dir_dentry;
 530
 531         dget(lower_dentry);
 532         lower_dir_dentry = lock_parent(lower_dentry);
 533         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 534         if (rc) {
 535                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 536                 goto out_unlock;
 537         }
 538         fsstack_copy_attr_times(dir, lower_dir_inode);
 539         dentry->d_inode->i_nlink =
 540                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 541         dentry->d_inode->i_ctime = dir->i_ctime;
 542         d_drop(dentry);
 543 out_unlock:
 544         unlock_dir(lower_dir_dentry);
 545         dput(lower_dentry);
 546         return rc;
 547 }
 548
 549 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 550                             const char *symname)
 551 {
 552         int rc;
 553         struct dentry *lower_dentry;
 554         struct dentry *lower_dir_dentry;
 555         char *encoded_symname;
 556         size_t encoded_symlen;
 557         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 558
 559         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 560         dget(lower_dentry);
 561         lower_dir_dentry = lock_parent(lower_dentry);
 562         mount_crypt_stat = &ecryptfs_superblock_to_private(
 563                 dir->i_sb)->mount_crypt_stat;
 564         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 565                                                   &encoded_symlen,
 566                                                   NULL,
 567                                                   mount_crypt_stat, symname,
 568                                                   strlen(symname));
 569         if (rc)
 570                 goto out_lock;
 571         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 572                          encoded_symname);
 573         kfree(encoded_symname);
 574         if (rc || !lower_dentry->d_inode)
 575                 goto out_lock;
 576         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 577         if (rc)
 578                 goto out_lock;
 579         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 580         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 581 out_lock:
 582         unlock_dir(lower_dir_dentry);
 583         dput(lower_dentry);
 584         if (!dentry->d_inode)
 585                 d_drop(dentry);
 586         return rc;
 587 }
 588
 589 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 590 {
 591         int rc;
 592         struct dentry *lower_dentry;
 593         struct dentry *lower_dir_dentry;
 594
 595         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 596         lower_dir_dentry = lock_parent(lower_dentry);
 597         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 598         if (rc || !lower_dentry->d_inode)
 599                 goto out;
 600         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 601         if (rc)
 602                 goto out;
 603         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 604         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 605         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 606 out:
 607         unlock_dir(lower_dir_dentry);
 608         if (!dentry->d_inode)
 609                 d_drop(dentry);
 610         return rc;
 611 }
 612
 613 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 614 {
 615         struct dentry *lower_dentry;
 616         struct dentry *lower_dir_dentry;
 617         int rc;
 618
 619         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 620         dget(dentry);
 621         lower_dir_dentry = lock_parent(lower_dentry);
 622         dget(lower_dentry);
 623         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 624         dput(lower_dentry);
 625         if (!rc && dentry->d_inode)
 626                 clear_nlink(dentry->d_inode);
 627         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 628         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 629         unlock_dir(lower_dir_dentry);
 630         if (!rc)
 631                 d_drop(dentry);
 632         dput(dentry);
 633         return rc;
 634 }
 635
 636 static int
 637 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 638 {
 639         int rc;
 640         struct dentry *lower_dentry;
 641         struct dentry *lower_dir_dentry;
 642
 643         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 644         lower_dir_dentry = lock_parent(lower_dentry);
 645         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 646         if (rc || !lower_dentry->d_inode)
 647                 goto out;
 648         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 649         if (rc)
 650                 goto out;
 651         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 652         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 653 out:
 654         unlock_dir(lower_dir_dentry);
 655         if (!dentry->d_inode)
 656                 d_drop(dentry);
 657         return rc;
 658 }
 659
 660 static int
 661 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 662                 struct inode *new_dir, struct dentry *new_dentry)
 663 {
 664         int rc;
 665         struct dentry *lower_old_dentry;
 666         struct dentry *lower_new_dentry;
 667         struct dentry *lower_old_dir_dentry;
 668         struct dentry *lower_new_dir_dentry;
 669         struct dentry *trap = NULL;
 670
 671         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 672         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 673         dget(lower_old_dentry);
 674         dget(lower_new_dentry);
 675         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 676         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 677         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 678         /* source should not be ancestor of target */
 679         if (trap == lower_old_dentry) {
 680                 rc = -EINVAL;
 681                 goto out_lock;
 682         }
 683         /* target should not be ancestor of source */
 684         if (trap == lower_new_dentry) {
 685                 rc = -ENOTEMPTY;
 686                 goto out_lock;
 687         }
 688         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 689                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 690         if (rc)
 691                 goto out_lock;
 692         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 693         if (new_dir != old_dir)
 694                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 695 out_lock:
 696         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 697         dput(lower_new_dir_dentry);
 698         dput(lower_old_dir_dentry);
 699         dput(lower_new_dentry);
 700         dput(lower_old_dentry);
 701         return rc;
 702 }
 703
 704 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 705                                    size_t *bufsiz)
 706 {
 707         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 708         char *lower_buf;
 709         size_t lower_bufsiz = PATH_MAX;
 710         mm_segment_t old_fs;
 711         int rc;
 712
 713         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 714         if (!lower_buf) {
 715                 rc = -ENOMEM;
 716                 goto out;
 717         }
 718         old_fs = get_fs();
 719         set_fs(get_ds());
 720         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 721                                                    (char __user *)lower_buf,
 722                                                    lower_bufsiz);
 723         set_fs(old_fs);
 724         if (rc < 0)
 725                 goto out;
 726         lower_bufsiz = rc;
 727         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 728                                                   lower_buf, lower_bufsiz);
 729 out:
 730         kfree(lower_buf);
 731         return rc;
 732 }
 733
 734 static int
 735 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 736 {
 737         char *kbuf;
 738         size_t kbufsiz, copied;
 739         int rc;
 740
 741         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 742         if (rc)
 743                 goto out;
 744         copied = min_t(size_t, bufsiz, kbufsiz);
 745         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 746         kfree(kbuf);
 747         fsstack_copy_attr_atime(dentry->d_inode,
 748                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 749 out:
 750         return rc;
 751 }
 752
 753 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 754 {
 755         char *buf;
 756         int len = PAGE_SIZE, rc;
 757         mm_segment_t old_fs;
 758
 759         /* Released in ecryptfs_put_link(); only release here on error */
 760         buf = kmalloc(len, GFP_KERNEL);
 761         if (!buf) {
 762                 buf = ERR_PTR(-ENOMEM);
 763                 goto out;
 764         }
 765         old_fs = get_fs();
 766         set_fs(get_ds());
 767         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 768         set_fs(old_fs);
 769         if (rc < 0) {
 770                 kfree(buf);
 771                 buf = ERR_PTR(rc);
 772         } else
 773                 buf[rc] = '\0';
 774 out:
 775         nd_set_link(nd, buf);
 776         return NULL;
 777 }
 778
 779 static void
 780 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 781 {
 782         char *buf = nd_get_link(nd);
 783         if (!IS_ERR(buf)) {
 784                 /* Free the char* */
 785                 kfree(buf);
 786         }
 787 }
 788
 789 /**
 790  * upper_size_to_lower_size
 791  * @crypt_stat: Crypt_stat associated with file
 792  * @upper_size: Size of the upper file
 793  *
 794  * Calculate the required size of the lower file based on the
 795  * specified size of the upper file. This calculation is based on the
 796  * number of headers in the underlying file and the extent size.
 797  *
 798  * Returns Calculated size of the lower file.
 799  */
 800 static loff_t
 801 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 802                          loff_t upper_size)
 803 {
 804         loff_t lower_size;
 805
 806         lower_size = ecryptfs_lower_header_size(crypt_stat);
 807         if (upper_size != 0) {
 808                 loff_t num_extents;
 809
 810                 num_extents = upper_size >> crypt_stat->extent_shift;
 811                 if (upper_size & ~crypt_stat->extent_mask)
 812                         num_extents++;
 813                 lower_size += (num_extents * crypt_stat->extent_size);
 814         }
 815         return lower_size;
 816 }
 817
 818 /**
 819  * truncate_upper
 820  * @dentry: The ecryptfs layer dentry
 821  * @ia: Address of the ecryptfs inode's attributes
 822  * @lower_ia: Address of the lower inode's attributes
 823  *
 824  * Function to handle truncations modifying the size of the file. Note
 825  * that the file sizes are interpolated. When expanding, we are simply
 826  * writing strings of 0's out. When truncating, we truncate the upper
 827  * inode and update the lower_ia according to the page index
 828  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 829  * the caller must use lower_ia in a call to notify_change() to perform
 830  * the truncation of the lower inode.
 831  *
 832  * Returns zero on success; non-zero otherwise
 833  */
 834 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 835                           struct iattr *lower_ia)
 836 {
 837         int rc = 0;
 838         struct inode *inode = dentry->d_inode;
 839         struct ecryptfs_crypt_stat *crypt_stat;
 840         loff_t i_size = i_size_read(inode);
 841         loff_t lower_size_before_truncate;
 842         loff_t lower_size_after_truncate;
 843
 844         if (unlikely((ia->ia_size == i_size))) {
 845                 lower_ia->ia_valid &= ~ATTR_SIZE;
 846                 return 0;
 847         }
 848         rc = ecryptfs_get_lower_file(dentry, inode);
 849         if (rc)
 850                 return rc;
 851         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 852         /* Switch on growing or shrinking file */
 853         if (ia->ia_size > i_size) {
 854                 char zero[] = { 0x00 };
 855
 856                 lower_ia->ia_valid &= ~ATTR_SIZE;
 857                 /* Write a single 0 at the last position of the file;
 858                  * this triggers code that will fill in 0's throughout
 859                  * the intermediate portion of the previous end of the
 860                  * file and the new and of the file */
 861                 rc = ecryptfs_write(inode, zero,
 862                                     (ia->ia_size - 1), 1);
 863         } else { /* ia->ia_size < i_size_read(inode) */
 864                 /* We're chopping off all the pages down to the page
 865                  * in which ia->ia_size is located. Fill in the end of
 866                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 867                  * PAGE_CACHE_SIZE with zeros. */
 868                 size_t num_zeros = (PAGE_CACHE_SIZE
 869                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 870
 871
 872                 /*
 873                  * XXX(truncate) this should really happen at the begginning
 874                  * of ->setattr.  But the code is too messy to that as part
 875                  * of a larger patch.  ecryptfs is also totally missing out
 876                  * on the inode_change_ok check at the beginning of
 877                  * ->setattr while would include this.
 878                  */
 879                 rc = inode_newsize_ok(inode, ia->ia_size);
 880                 if (rc)
 881                         goto out;
 882
 883                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 884                         truncate_setsize(inode, ia->ia_size);
 885                         lower_ia->ia_size = ia->ia_size;
 886                         lower_ia->ia_valid |= ATTR_SIZE;
 887                         goto out;
 888                 }
 889                 if (num_zeros) {
 890                         char *zeros_virt;
 891
 892                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 893                         if (!zeros_virt) {
 894                                 rc = -ENOMEM;
 895                                 goto out;
 896                         }
 897                         rc = ecryptfs_write(inode, zeros_virt,
 898                                             ia->ia_size, num_zeros);
 899                         kfree(zeros_virt);
 900                         if (rc) {
 901                                 printk(KERN_ERR "Error attempting to zero out "
 902                                        "the remainder of the end page on "
 903                                        "reducing truncate; rc = [%d]\n", rc);
 904                                 goto out;
 905                         }
 906                 }
 907                 truncate_setsize(inode, ia->ia_size);
 908                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 909                 if (rc) {
 910                         printk(KERN_ERR "Problem with "
 911                                "ecryptfs_write_inode_size_to_metadata; "
 912                                "rc = [%d]\n", rc);
 913                         goto out;
 914                 }
 915                 /* We are reducing the size of the ecryptfs file, and need to
 916                  * know if we need to reduce the size of the lower file. */
 917                 lower_size_before_truncate =
 918                     upper_size_to_lower_size(crypt_stat, i_size);
 919                 lower_size_after_truncate =
 920                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 921                 if (lower_size_after_truncate < lower_size_before_truncate) {
 922                         lower_ia->ia_size = lower_size_after_truncate;
 923                         lower_ia->ia_valid |= ATTR_SIZE;
 924                 } else
 925                         lower_ia->ia_valid &= ~ATTR_SIZE;
 926         }
 927 out:
 928         ecryptfs_put_lower_file(inode);
 929         return rc;
 930 }
 931
 932 /**
 933  * ecryptfs_truncate
 934  * @dentry: The ecryptfs layer dentry
 935  * @new_length: The length to expand the file to
 936  *
 937  * Simple function that handles the truncation of an eCryptfs inode and
 938  * its corresponding lower inode.
 939  *
 940  * Returns zero on success; non-zero otherwise
 941  */
 942 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 943 {
 944         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 945         struct iattr lower_ia = { .ia_valid = 0 };
 946         int rc;
 947
 948         rc = truncate_upper(dentry, &ia, &lower_ia);
 949         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 950                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 951
 952                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 953                 rc = notify_change(lower_dentry, &lower_ia);
 954                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 955         }
 956         return rc;
 957 }
 958
 959 static int
 960 ecryptfs_permission(struct inode *inode, int mask, unsigned int flags)
 961 {
 962         if (flags & IPERM_FLAG_RCU)
 963                 return -ECHILD;
 964         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 965 }
 966
 967 /**
 968  * ecryptfs_setattr
 969  * @dentry: dentry handle to the inode to modify
 970  * @ia: Structure with flags of what to change and values
 971  *
 972  * Updates the metadata of an inode. If the update is to the size
 973  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 974  * of both the ecryptfs inode and the lower inode.
 975  *
 976  * All other metadata changes will be passed right to the lower filesystem,
 977  * and we will just update our inode to look like the lower.
 978  */
 979 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 980 {
 981         int rc = 0;
 982         struct dentry *lower_dentry;
 983         struct iattr lower_ia;
 984         struct inode *inode;
 985         struct inode *lower_inode;
 986         struct ecryptfs_crypt_stat *crypt_stat;
 987
 988         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 989         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 990                 ecryptfs_init_crypt_stat(crypt_stat);
 991         inode = dentry->d_inode;
 992         lower_inode = ecryptfs_inode_to_lower(inode);
 993         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 994         mutex_lock(&crypt_stat->cs_mutex);
 995         if (S_ISDIR(dentry->d_inode->i_mode))
 996                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 997         else if (S_ISREG(dentry->d_inode->i_mode)
 998                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 999                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
1000                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1001
1002                 mount_crypt_stat = &ecryptfs_superblock_to_private(
1003                         dentry->d_sb)->mount_crypt_stat;
1004                 rc = ecryptfs_get_lower_file(dentry, inode);
1005                 if (rc) {
1006                         mutex_unlock(&crypt_stat->cs_mutex);
1007                         goto out;
1008                 }
1009                 rc = ecryptfs_read_metadata(dentry);
1010                 ecryptfs_put_lower_file(inode);
1011                 if (rc) {
1012                         if (!(mount_crypt_stat->flags
1013                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
1014                                 rc = -EIO;
1015                                 printk(KERN_WARNING "Either the lower file "
1016                                        "is not in a valid eCryptfs format, "
1017                                        "or the key could not be retrieved. "
1018                                        "Plaintext passthrough mode is not "
1019                                        "enabled; returning -EIO\n");
1020                                 mutex_unlock(&crypt_stat->cs_mutex);
1021                                 goto out;
1022                         }
1023                         rc = 0;
1024                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
1025                                                | ECRYPTFS_ENCRYPTED);
1026                 }
1027         }
1028         mutex_unlock(&crypt_stat->cs_mutex);
1029         if (S_ISREG(inode->i_mode)) {
1030                 rc = filemap_write_and_wait(inode->i_mapping);
1031                 if (rc)
1032                         goto out;
1033                 fsstack_copy_attr_all(inode, lower_inode);
1034         }
1035         memcpy(&lower_ia, ia, sizeof(lower_ia));
1036         if (ia->ia_valid & ATTR_FILE)
1037                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1038         if (ia->ia_valid & ATTR_SIZE) {
1039                 rc = truncate_upper(dentry, ia, &lower_ia);
1040                 if (rc < 0)
1041                         goto out;
1042         }
1043
1044         /*
1045          * mode change is for clearing setuid/setgid bits. Allow lower fs
1046          * to interpret this in its own way.
1047          */
1048         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1049                 lower_ia.ia_valid &= ~ATTR_MODE;
1050
1051         mutex_lock(&lower_dentry->d_inode->i_mutex);
1052         rc = notify_change(lower_dentry, &lower_ia);
1053         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1054 out:
1055         fsstack_copy_attr_all(inode, lower_inode);
1056         return rc;
1057 }
1058
1059 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1060                           struct kstat *stat)
1061 {
1062         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1063         int rc = 0;
1064
1065         mount_crypt_stat = &ecryptfs_superblock_to_private(
1066                                                 dentry->d_sb)->mount_crypt_stat;
1067         generic_fillattr(dentry->d_inode, stat);
1068         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1069                 char *target;
1070                 size_t targetsiz;
1071
1072                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1073                 if (!rc) {
1074                         kfree(target);
1075                         stat->size = targetsiz;
1076                 }
1077         }
1078         return rc;
1079 }
1080
1081 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1082                      struct kstat *stat)
1083 {
1084         struct kstat lower_stat;
1085         int rc;
1086
1087         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1088                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1089         if (!rc) {
1090                 fsstack_copy_attr_all(dentry->d_inode,
1091                                       ecryptfs_inode_to_lower(dentry->d_inode));
1092                 generic_fillattr(dentry->d_inode, stat);
1093                 stat->blocks = lower_stat.blocks;
1094         }
1095         return rc;
1096 }
1097
1098 int
1099 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1100                   size_t size, int flags)
1101 {
1102         int rc = 0;
1103         struct dentry *lower_dentry;
1104
1105         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1106         if (!lower_dentry->d_inode->i_op->setxattr) {
1107                 rc = -EOPNOTSUPP;
1108                 goto out;
1109         }
1110
1111         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1112 out:
1113         return rc;
1114 }
1115
1116 ssize_t
1117 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1118                         void *value, size_t size)
1119 {
1120         int rc = 0;
1121
1122         if (!lower_dentry->d_inode->i_op->getxattr) {
1123                 rc = -EOPNOTSUPP;
1124                 goto out;
1125         }
1126         mutex_lock(&lower_dentry->d_inode->i_mutex);
1127         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1128                                                    size);
1129         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1130 out:
1131         return rc;
1132 }
1133
1134 static ssize_t
1135 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1136                   size_t size)
1137 {
1138         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1139                                        value, size);
1140 }
1141
1142 static ssize_t
1143 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1144 {
1145         int rc = 0;
1146         struct dentry *lower_dentry;
1147
1148         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1149         if (!lower_dentry->d_inode->i_op->listxattr) {
1150                 rc = -EOPNOTSUPP;
1151                 goto out;
1152         }
1153         mutex_lock(&lower_dentry->d_inode->i_mutex);
1154         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1155         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1156 out:
1157         return rc;
1158 }
1159
1160 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1161 {
1162         int rc = 0;
1163         struct dentry *lower_dentry;
1164
1165         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1166         if (!lower_dentry->d_inode->i_op->removexattr) {
1167                 rc = -EOPNOTSUPP;
1168                 goto out;
1169         }
1170         mutex_lock(&lower_dentry->d_inode->i_mutex);
1171         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1172         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1173 out:
1174         return rc;
1175 }
1176
1177 const struct inode_operations ecryptfs_symlink_iops = {
1178         .readlink = ecryptfs_readlink,
1179         .follow_link = ecryptfs_follow_link,
1180         .put_link = ecryptfs_put_link,
1181         .permission = ecryptfs_permission,
1182         .setattr = ecryptfs_setattr,
1183         .getattr = ecryptfs_getattr_link,
1184         .setxattr = ecryptfs_setxattr,
1185         .getxattr = ecryptfs_getxattr,
1186         .listxattr = ecryptfs_listxattr,
1187         .removexattr = ecryptfs_removexattr
1188 };
1189
1190 const struct inode_operations ecryptfs_dir_iops = {
1191         .create = ecryptfs_create,
1192         .lookup = ecryptfs_lookup,
1193         .link = ecryptfs_link,
1194         .unlink = ecryptfs_unlink,
1195         .symlink = ecryptfs_symlink,
1196         .mkdir = ecryptfs_mkdir,
1197         .rmdir = ecryptfs_rmdir,
1198         .mknod = ecryptfs_mknod,
1199         .rename = ecryptfs_rename,
1200         .permission = ecryptfs_permission,
1201         .setattr = ecryptfs_setattr,
1202         .setxattr = ecryptfs_setxattr,
1203         .getxattr = ecryptfs_getxattr,
1204         .listxattr = ecryptfs_listxattr,
1205         .removexattr = ecryptfs_removexattr
1206 };
1207
1208 const struct inode_operations ecryptfs_main_iops = {
1209         .permission = ecryptfs_permission,
1210         .setattr = ecryptfs_setattr,
1211         .getattr = ecryptfs_getattr,
1212         .setxattr = ecryptfs_setxattr,
1213         .getxattr = ecryptfs_getxattr,
1214         .listxattr = ecryptfs_listxattr,
1215         .removexattr = ecryptfs_removexattr
1216 };