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         if (rc) {
 264                 printk(KERN_ERR "%s: Error attempting to initialize "
 265                         "the lower file for the dentry with name "
 266                         "[%s]; rc = [%d]\n", __func__,
 267                         ecryptfs_dentry->d_name.name, rc);
 268                 goto out;
 269         }
 270         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 271         if (rc)
 272                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 273         ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 274 out:
 275         return rc;
 276 }
 277
 278 /**
 279  * ecryptfs_create
 280  * @dir: The inode of the directory in which to create the file.
 281  * @dentry: The eCryptfs dentry
 282  * @mode: The mode of the new file.
 283  * @nd: nameidata
 284  *
 285  * Creates a new file.
 286  *
 287  * Returns zero on success; non-zero on error condition
 288  */
 289 static int
 290 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 291                 int mode, struct nameidata *nd)
 292 {
 293         int rc;
 294
 295         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 296         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 297         if (unlikely(rc)) {
 298                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 299                                 "lower filesystem\n");
 300                 goto out;
 301         }
 302         /* At this point, a file exists on "disk"; we need to make sure
 303          * that this on disk file is prepared to be an ecryptfs file */
 304         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 305 out:
 306         return rc;
 307 }
 308
 309 /**
 310  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
 311  */
 312 static int ecryptfs_lookup_interpose(struct dentry *ecryptfs_dentry,
 313                                      struct dentry *lower_dentry,
 314                                      struct inode *ecryptfs_dir_inode)
 315 {
 316         struct dentry *lower_dir_dentry;
 317         struct vfsmount *lower_mnt;
 318         struct inode *inode, *lower_inode;
 319         struct ecryptfs_crypt_stat *crypt_stat;
 320         char *page_virt = NULL;
 321         int put_lower = 0, rc = 0;
 322
 323         lower_dir_dentry = lower_dentry->d_parent;
 324         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 325                                    ecryptfs_dentry->d_parent));
 326         lower_inode = lower_dentry->d_inode;
 327         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
 328         BUG_ON(!lower_dentry->d_count);
 329         ecryptfs_set_dentry_private(ecryptfs_dentry,
 330                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
 331                                                      GFP_KERNEL));
 332         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
 333                 rc = -ENOMEM;
 334                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 335                        "to allocate ecryptfs_dentry_info struct\n",
 336                         __func__);
 337                 goto out_put;
 338         }
 339         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 340         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
 341         if (!lower_dentry->d_inode) {
 342                 /* We want to add because we couldn't find in lower */
 343                 d_add(ecryptfs_dentry, NULL);
 344                 goto out;
 345         }
 346         inode = __ecryptfs_get_inode(lower_inode, ecryptfs_dir_inode->i_sb);
 347         if (IS_ERR(inode)) {
 348                 rc = PTR_ERR(inode);
 349                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
 350                        __func__, rc);
 351                 goto out;
 352         }
 353         if (inode->i_state & I_NEW)
 354                 unlock_new_inode(inode);
 355         d_add(ecryptfs_dentry, inode);
 356         if (S_ISDIR(lower_inode->i_mode))
 357                 goto out;
 358         if (S_ISLNK(lower_inode->i_mode))
 359                 goto out;
 360         if (special_file(lower_inode->i_mode))
 361                 goto out;
 362         /* Released in this function */
 363         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
 364         if (!page_virt) {
 365                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
 366                        __func__);
 367                 rc = -ENOMEM;
 368                 goto out;
 369         }
 370         rc = ecryptfs_get_lower_file(ecryptfs_dentry);
 371         if (rc) {
 372                 printk(KERN_ERR "%s: Error attempting to initialize "
 373                         "the lower file for the dentry with name "
 374                         "[%s]; rc = [%d]\n", __func__,
 375                         ecryptfs_dentry->d_name.name, rc);
 376                 goto out_free_kmem;
 377         }
 378         put_lower = 1;
 379         crypt_stat = &ecryptfs_inode_to_private(
 380                                         ecryptfs_dentry->d_inode)->crypt_stat;
 381         /* TODO: lock for crypt_stat comparison */
 382         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 383                         ecryptfs_set_default_sizes(crypt_stat);
 384         rc = ecryptfs_read_and_validate_header_region(page_virt,
 385                                                       ecryptfs_dentry->d_inode);
 386         if (rc) {
 387                 memset(page_virt, 0, PAGE_CACHE_SIZE);
 388                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 389                                                              ecryptfs_dentry);
 390                 if (rc) {
 391                         rc = 0;
 392                         goto out_free_kmem;
 393                 }
 394                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 395         }
 396         ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode);
 397 out_free_kmem:
 398         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 399         goto out;
 400 out_put:
 401         dput(lower_dentry);
 402         mntput(lower_mnt);
 403         d_drop(ecryptfs_dentry);
 404 out:
 405         if (put_lower)
 406                 ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 407         return rc;
 408 }
 409
 410 /**
 411  * ecryptfs_lookup
 412  * @ecryptfs_dir_inode: The eCryptfs directory inode
 413  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 414  * @ecryptfs_nd: nameidata; may be NULL
 415  *
 416  * Find a file on disk. If the file does not exist, then we'll add it to the
 417  * dentry cache and continue on to read it from the disk.
 418  */
 419 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 420                                       struct dentry *ecryptfs_dentry,
 421                                       struct nameidata *ecryptfs_nd)
 422 {
 423         char *encrypted_and_encoded_name = NULL;
 424         size_t encrypted_and_encoded_name_size;
 425         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 426         struct dentry *lower_dir_dentry, *lower_dentry;
 427         int rc = 0;
 428
 429         if ((ecryptfs_dentry->d_name.len == 1
 430              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 431             || (ecryptfs_dentry->d_name.len == 2
 432                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 433                 goto out_d_drop;
 434         }
 435         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 436         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 437         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 438                                       lower_dir_dentry,
 439                                       ecryptfs_dentry->d_name.len);
 440         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 441         if (IS_ERR(lower_dentry)) {
 442                 rc = PTR_ERR(lower_dentry);
 443                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 444                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 445                                 encrypted_and_encoded_name);
 446                 goto out_d_drop;
 447         }
 448         if (lower_dentry->d_inode)
 449                 goto interpose;
 450         mount_crypt_stat = &ecryptfs_superblock_to_private(
 451                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 452         if (!(mount_crypt_stat
 453             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 454                 goto interpose;
 455         dput(lower_dentry);
 456         rc = ecryptfs_encrypt_and_encode_filename(
 457                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 458                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 459                 ecryptfs_dentry->d_name.len);
 460         if (rc) {
 461                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 462                        "filename; rc = [%d]\n", __func__, rc);
 463                 goto out_d_drop;
 464         }
 465         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 466         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 467                                       lower_dir_dentry,
 468                                       encrypted_and_encoded_name_size);
 469         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 470         if (IS_ERR(lower_dentry)) {
 471                 rc = PTR_ERR(lower_dentry);
 472                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 473                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 474                                 encrypted_and_encoded_name);
 475                 goto out_d_drop;
 476         }
 477 interpose:
 478         rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
 479                                        ecryptfs_dir_inode);
 480         goto out;
 481 out_d_drop:
 482         d_drop(ecryptfs_dentry);
 483 out:
 484         kfree(encrypted_and_encoded_name);
 485         return ERR_PTR(rc);
 486 }
 487
 488 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 489                          struct dentry *new_dentry)
 490 {
 491         struct dentry *lower_old_dentry;
 492         struct dentry *lower_new_dentry;
 493         struct dentry *lower_dir_dentry;
 494         u64 file_size_save;
 495         int rc;
 496
 497         file_size_save = i_size_read(old_dentry->d_inode);
 498         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 499         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 500         dget(lower_old_dentry);
 501         dget(lower_new_dentry);
 502         lower_dir_dentry = lock_parent(lower_new_dentry);
 503         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 504                       lower_new_dentry);
 505         if (rc || !lower_new_dentry->d_inode)
 506                 goto out_lock;
 507         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
 508         if (rc)
 509                 goto out_lock;
 510         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 511         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 512         old_dentry->d_inode->i_nlink =
 513                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 514         i_size_write(new_dentry->d_inode, file_size_save);
 515 out_lock:
 516         unlock_dir(lower_dir_dentry);
 517         dput(lower_new_dentry);
 518         dput(lower_old_dentry);
 519         return rc;
 520 }
 521
 522 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 523 {
 524         int rc = 0;
 525         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 526         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 527         struct dentry *lower_dir_dentry;
 528
 529         dget(lower_dentry);
 530         lower_dir_dentry = lock_parent(lower_dentry);
 531         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 532         if (rc) {
 533                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 534                 goto out_unlock;
 535         }
 536         fsstack_copy_attr_times(dir, lower_dir_inode);
 537         dentry->d_inode->i_nlink =
 538                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 539         dentry->d_inode->i_ctime = dir->i_ctime;
 540         d_drop(dentry);
 541 out_unlock:
 542         unlock_dir(lower_dir_dentry);
 543         dput(lower_dentry);
 544         return rc;
 545 }
 546
 547 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 548                             const char *symname)
 549 {
 550         int rc;
 551         struct dentry *lower_dentry;
 552         struct dentry *lower_dir_dentry;
 553         char *encoded_symname;
 554         size_t encoded_symlen;
 555         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 556
 557         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 558         dget(lower_dentry);
 559         lower_dir_dentry = lock_parent(lower_dentry);
 560         mount_crypt_stat = &ecryptfs_superblock_to_private(
 561                 dir->i_sb)->mount_crypt_stat;
 562         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 563                                                   &encoded_symlen,
 564                                                   NULL,
 565                                                   mount_crypt_stat, symname,
 566                                                   strlen(symname));
 567         if (rc)
 568                 goto out_lock;
 569         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 570                          encoded_symname);
 571         kfree(encoded_symname);
 572         if (rc || !lower_dentry->d_inode)
 573                 goto out_lock;
 574         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 575         if (rc)
 576                 goto out_lock;
 577         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 578         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 579 out_lock:
 580         unlock_dir(lower_dir_dentry);
 581         dput(lower_dentry);
 582         if (!dentry->d_inode)
 583                 d_drop(dentry);
 584         return rc;
 585 }
 586
 587 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 588 {
 589         int rc;
 590         struct dentry *lower_dentry;
 591         struct dentry *lower_dir_dentry;
 592
 593         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 594         lower_dir_dentry = lock_parent(lower_dentry);
 595         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 596         if (rc || !lower_dentry->d_inode)
 597                 goto out;
 598         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 599         if (rc)
 600                 goto out;
 601         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 602         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 603         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 604 out:
 605         unlock_dir(lower_dir_dentry);
 606         if (!dentry->d_inode)
 607                 d_drop(dentry);
 608         return rc;
 609 }
 610
 611 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 612 {
 613         struct dentry *lower_dentry;
 614         struct dentry *lower_dir_dentry;
 615         int rc;
 616
 617         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 618         dget(dentry);
 619         lower_dir_dentry = lock_parent(lower_dentry);
 620         dget(lower_dentry);
 621         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 622         dput(lower_dentry);
 623         if (!rc && dentry->d_inode)
 624                 clear_nlink(dentry->d_inode);
 625         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 626         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 627         unlock_dir(lower_dir_dentry);
 628         if (!rc)
 629                 d_drop(dentry);
 630         dput(dentry);
 631         return rc;
 632 }
 633
 634 static int
 635 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 636 {
 637         int rc;
 638         struct dentry *lower_dentry;
 639         struct dentry *lower_dir_dentry;
 640
 641         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 642         lower_dir_dentry = lock_parent(lower_dentry);
 643         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 644         if (rc || !lower_dentry->d_inode)
 645                 goto out;
 646         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 647         if (rc)
 648                 goto out;
 649         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 650         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 651 out:
 652         unlock_dir(lower_dir_dentry);
 653         if (!dentry->d_inode)
 654                 d_drop(dentry);
 655         return rc;
 656 }
 657
 658 static int
 659 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 660                 struct inode *new_dir, struct dentry *new_dentry)
 661 {
 662         int rc;
 663         struct dentry *lower_old_dentry;
 664         struct dentry *lower_new_dentry;
 665         struct dentry *lower_old_dir_dentry;
 666         struct dentry *lower_new_dir_dentry;
 667         struct dentry *trap = NULL;
 668
 669         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 670         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 671         dget(lower_old_dentry);
 672         dget(lower_new_dentry);
 673         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 674         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 675         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 676         /* source should not be ancestor of target */
 677         if (trap == lower_old_dentry) {
 678                 rc = -EINVAL;
 679                 goto out_lock;
 680         }
 681         /* target should not be ancestor of source */
 682         if (trap == lower_new_dentry) {
 683                 rc = -ENOTEMPTY;
 684                 goto out_lock;
 685         }
 686         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 687                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 688         if (rc)
 689                 goto out_lock;
 690         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 691         if (new_dir != old_dir)
 692                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 693 out_lock:
 694         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 695         dput(lower_new_dir_dentry);
 696         dput(lower_old_dir_dentry);
 697         dput(lower_new_dentry);
 698         dput(lower_old_dentry);
 699         return rc;
 700 }
 701
 702 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 703                                    size_t *bufsiz)
 704 {
 705         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 706         char *lower_buf;
 707         size_t lower_bufsiz = PATH_MAX;
 708         mm_segment_t old_fs;
 709         int rc;
 710
 711         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 712         if (!lower_buf) {
 713                 rc = -ENOMEM;
 714                 goto out;
 715         }
 716         old_fs = get_fs();
 717         set_fs(get_ds());
 718         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 719                                                    (char __user *)lower_buf,
 720                                                    lower_bufsiz);
 721         set_fs(old_fs);
 722         if (rc < 0)
 723                 goto out;
 724         lower_bufsiz = rc;
 725         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 726                                                   lower_buf, lower_bufsiz);
 727 out:
 728         kfree(lower_buf);
 729         return rc;
 730 }
 731
 732 static int
 733 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 734 {
 735         char *kbuf;
 736         size_t kbufsiz, copied;
 737         int rc;
 738
 739         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 740         if (rc)
 741                 goto out;
 742         copied = min_t(size_t, bufsiz, kbufsiz);
 743         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 744         kfree(kbuf);
 745         fsstack_copy_attr_atime(dentry->d_inode,
 746                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 747 out:
 748         return rc;
 749 }
 750
 751 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 752 {
 753         char *buf;
 754         int len = PAGE_SIZE, rc;
 755         mm_segment_t old_fs;
 756
 757         /* Released in ecryptfs_put_link(); only release here on error */
 758         buf = kmalloc(len, GFP_KERNEL);
 759         if (!buf) {
 760                 buf = ERR_PTR(-ENOMEM);
 761                 goto out;
 762         }
 763         old_fs = get_fs();
 764         set_fs(get_ds());
 765         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 766         set_fs(old_fs);
 767         if (rc < 0) {
 768                 kfree(buf);
 769                 buf = ERR_PTR(rc);
 770         } else
 771                 buf[rc] = '\0';
 772 out:
 773         nd_set_link(nd, buf);
 774         return NULL;
 775 }
 776
 777 static void
 778 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 779 {
 780         char *buf = nd_get_link(nd);
 781         if (!IS_ERR(buf)) {
 782                 /* Free the char* */
 783                 kfree(buf);
 784         }
 785 }
 786
 787 /**
 788  * upper_size_to_lower_size
 789  * @crypt_stat: Crypt_stat associated with file
 790  * @upper_size: Size of the upper file
 791  *
 792  * Calculate the required size of the lower file based on the
 793  * specified size of the upper file. This calculation is based on the
 794  * number of headers in the underlying file and the extent size.
 795  *
 796  * Returns Calculated size of the lower file.
 797  */
 798 static loff_t
 799 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 800                          loff_t upper_size)
 801 {
 802         loff_t lower_size;
 803
 804         lower_size = ecryptfs_lower_header_size(crypt_stat);
 805         if (upper_size != 0) {
 806                 loff_t num_extents;
 807
 808                 num_extents = upper_size >> crypt_stat->extent_shift;
 809                 if (upper_size & ~crypt_stat->extent_mask)
 810                         num_extents++;
 811                 lower_size += (num_extents * crypt_stat->extent_size);
 812         }
 813         return lower_size;
 814 }
 815
 816 /**
 817  * truncate_upper
 818  * @dentry: The ecryptfs layer dentry
 819  * @ia: Address of the ecryptfs inode's attributes
 820  * @lower_ia: Address of the lower inode's attributes
 821  *
 822  * Function to handle truncations modifying the size of the file. Note
 823  * that the file sizes are interpolated. When expanding, we are simply
 824  * writing strings of 0's out. When truncating, we truncate the upper
 825  * inode and update the lower_ia according to the page index
 826  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 827  * the caller must use lower_ia in a call to notify_change() to perform
 828  * the truncation of the lower inode.
 829  *
 830  * Returns zero on success; non-zero otherwise
 831  */
 832 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 833                           struct iattr *lower_ia)
 834 {
 835         int rc = 0;
 836         struct inode *inode = dentry->d_inode;
 837         struct ecryptfs_crypt_stat *crypt_stat;
 838         loff_t i_size = i_size_read(inode);
 839         loff_t lower_size_before_truncate;
 840         loff_t lower_size_after_truncate;
 841
 842         if (unlikely((ia->ia_size == i_size))) {
 843                 lower_ia->ia_valid &= ~ATTR_SIZE;
 844                 return 0;
 845         }
 846         rc = ecryptfs_get_lower_file(dentry);
 847         if (rc)
 848                 return rc;
 849         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 850         /* Switch on growing or shrinking file */
 851         if (ia->ia_size > i_size) {
 852                 char zero[] = { 0x00 };
 853
 854                 lower_ia->ia_valid &= ~ATTR_SIZE;
 855                 /* Write a single 0 at the last position of the file;
 856                  * this triggers code that will fill in 0's throughout
 857                  * the intermediate portion of the previous end of the
 858                  * file and the new and of the file */
 859                 rc = ecryptfs_write(inode, zero,
 860                                     (ia->ia_size - 1), 1);
 861         } else { /* ia->ia_size < i_size_read(inode) */
 862                 /* We're chopping off all the pages down to the page
 863                  * in which ia->ia_size is located. Fill in the end of
 864                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 865                  * PAGE_CACHE_SIZE with zeros. */
 866                 size_t num_zeros = (PAGE_CACHE_SIZE
 867                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 868
 869
 870                 /*
 871                  * XXX(truncate) this should really happen at the begginning
 872                  * of ->setattr.  But the code is too messy to that as part
 873                  * of a larger patch.  ecryptfs is also totally missing out
 874                  * on the inode_change_ok check at the beginning of
 875                  * ->setattr while would include this.
 876                  */
 877                 rc = inode_newsize_ok(inode, ia->ia_size);
 878                 if (rc)
 879                         goto out;
 880
 881                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 882                         truncate_setsize(inode, ia->ia_size);
 883                         lower_ia->ia_size = ia->ia_size;
 884                         lower_ia->ia_valid |= ATTR_SIZE;
 885                         goto out;
 886                 }
 887                 if (num_zeros) {
 888                         char *zeros_virt;
 889
 890                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 891                         if (!zeros_virt) {
 892                                 rc = -ENOMEM;
 893                                 goto out;
 894                         }
 895                         rc = ecryptfs_write(inode, zeros_virt,
 896                                             ia->ia_size, num_zeros);
 897                         kfree(zeros_virt);
 898                         if (rc) {
 899                                 printk(KERN_ERR "Error attempting to zero out "
 900                                        "the remainder of the end page on "
 901                                        "reducing truncate; rc = [%d]\n", rc);
 902                                 goto out;
 903                         }
 904                 }
 905                 truncate_setsize(inode, ia->ia_size);
 906                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 907                 if (rc) {
 908                         printk(KERN_ERR "Problem with "
 909                                "ecryptfs_write_inode_size_to_metadata; "
 910                                "rc = [%d]\n", rc);
 911                         goto out;
 912                 }
 913                 /* We are reducing the size of the ecryptfs file, and need to
 914                  * know if we need to reduce the size of the lower file. */
 915                 lower_size_before_truncate =
 916                     upper_size_to_lower_size(crypt_stat, i_size);
 917                 lower_size_after_truncate =
 918                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 919                 if (lower_size_after_truncate < lower_size_before_truncate) {
 920                         lower_ia->ia_size = lower_size_after_truncate;
 921                         lower_ia->ia_valid |= ATTR_SIZE;
 922                 } else
 923                         lower_ia->ia_valid &= ~ATTR_SIZE;
 924         }
 925 out:
 926         ecryptfs_put_lower_file(inode);
 927         return rc;
 928 }
 929
 930 /**
 931  * ecryptfs_truncate
 932  * @dentry: The ecryptfs layer dentry
 933  * @new_length: The length to expand the file to
 934  *
 935  * Simple function that handles the truncation of an eCryptfs inode and
 936  * its corresponding lower inode.
 937  *
 938  * Returns zero on success; non-zero otherwise
 939  */
 940 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 941 {
 942         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 943         struct iattr lower_ia = { .ia_valid = 0 };
 944         int rc;
 945
 946         rc = truncate_upper(dentry, &ia, &lower_ia);
 947         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 948                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 949
 950                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 951                 rc = notify_change(lower_dentry, &lower_ia);
 952                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 953         }
 954         return rc;
 955 }
 956
 957 static int
 958 ecryptfs_permission(struct inode *inode, int mask, unsigned int flags)
 959 {
 960         if (flags & IPERM_FLAG_RCU)
 961                 return -ECHILD;
 962         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 963 }
 964
 965 /**
 966  * ecryptfs_setattr
 967  * @dentry: dentry handle to the inode to modify
 968  * @ia: Structure with flags of what to change and values
 969  *
 970  * Updates the metadata of an inode. If the update is to the size
 971  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 972  * of both the ecryptfs inode and the lower inode.
 973  *
 974  * All other metadata changes will be passed right to the lower filesystem,
 975  * and we will just update our inode to look like the lower.
 976  */
 977 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 978 {
 979         int rc = 0;
 980         struct dentry *lower_dentry;
 981         struct iattr lower_ia;
 982         struct inode *inode;
 983         struct inode *lower_inode;
 984         struct ecryptfs_crypt_stat *crypt_stat;
 985
 986         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 987         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 988                 ecryptfs_init_crypt_stat(crypt_stat);
 989         inode = dentry->d_inode;
 990         lower_inode = ecryptfs_inode_to_lower(inode);
 991         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 992         mutex_lock(&crypt_stat->cs_mutex);
 993         if (S_ISDIR(dentry->d_inode->i_mode))
 994                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 995         else if (S_ISREG(dentry->d_inode->i_mode)
 996                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 997                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 998                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 999
1000                 mount_crypt_stat = &ecryptfs_superblock_to_private(
1001                         dentry->d_sb)->mount_crypt_stat;
1002                 rc = ecryptfs_get_lower_file(dentry);
1003                 if (rc) {
1004                         mutex_unlock(&crypt_stat->cs_mutex);
1005                         goto out;
1006                 }
1007                 rc = ecryptfs_read_metadata(dentry);
1008                 ecryptfs_put_lower_file(inode);
1009                 if (rc) {
1010                         if (!(mount_crypt_stat->flags
1011                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
1012                                 rc = -EIO;
1013                                 printk(KERN_WARNING "Either the lower file "
1014                                        "is not in a valid eCryptfs format, "
1015                                        "or the key could not be retrieved. "
1016                                        "Plaintext passthrough mode is not "
1017                                        "enabled; returning -EIO\n");
1018                                 mutex_unlock(&crypt_stat->cs_mutex);
1019                                 goto out;
1020                         }
1021                         rc = 0;
1022                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
1023                                                | ECRYPTFS_ENCRYPTED);
1024                 }
1025         }
1026         mutex_unlock(&crypt_stat->cs_mutex);
1027         if (S_ISREG(inode->i_mode)) {
1028                 rc = filemap_write_and_wait(inode->i_mapping);
1029                 if (rc)
1030                         goto out;
1031                 fsstack_copy_attr_all(inode, lower_inode);
1032         }
1033         memcpy(&lower_ia, ia, sizeof(lower_ia));
1034         if (ia->ia_valid & ATTR_FILE)
1035                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1036         if (ia->ia_valid & ATTR_SIZE) {
1037                 rc = truncate_upper(dentry, ia, &lower_ia);
1038                 if (rc < 0)
1039                         goto out;
1040         }
1041
1042         /*
1043          * mode change is for clearing setuid/setgid bits. Allow lower fs
1044          * to interpret this in its own way.
1045          */
1046         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1047                 lower_ia.ia_valid &= ~ATTR_MODE;
1048
1049         mutex_lock(&lower_dentry->d_inode->i_mutex);
1050         rc = notify_change(lower_dentry, &lower_ia);
1051         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1052 out:
1053         fsstack_copy_attr_all(inode, lower_inode);
1054         return rc;
1055 }
1056
1057 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1058                           struct kstat *stat)
1059 {
1060         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1061         int rc = 0;
1062
1063         mount_crypt_stat = &ecryptfs_superblock_to_private(
1064                                                 dentry->d_sb)->mount_crypt_stat;
1065         generic_fillattr(dentry->d_inode, stat);
1066         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1067                 char *target;
1068                 size_t targetsiz;
1069
1070                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1071                 if (!rc) {
1072                         kfree(target);
1073                         stat->size = targetsiz;
1074                 }
1075         }
1076         return rc;
1077 }
1078
1079 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1080                      struct kstat *stat)
1081 {
1082         struct kstat lower_stat;
1083         int rc;
1084
1085         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1086                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1087         if (!rc) {
1088                 fsstack_copy_attr_all(dentry->d_inode,
1089                                       ecryptfs_inode_to_lower(dentry->d_inode));
1090                 generic_fillattr(dentry->d_inode, stat);
1091                 stat->blocks = lower_stat.blocks;
1092         }
1093         return rc;
1094 }
1095
1096 int
1097 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1098                   size_t size, int flags)
1099 {
1100         int rc = 0;
1101         struct dentry *lower_dentry;
1102
1103         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1104         if (!lower_dentry->d_inode->i_op->setxattr) {
1105                 rc = -EOPNOTSUPP;
1106                 goto out;
1107         }
1108
1109         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1110 out:
1111         return rc;
1112 }
1113
1114 ssize_t
1115 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1116                         void *value, size_t size)
1117 {
1118         int rc = 0;
1119
1120         if (!lower_dentry->d_inode->i_op->getxattr) {
1121                 rc = -EOPNOTSUPP;
1122                 goto out;
1123         }
1124         mutex_lock(&lower_dentry->d_inode->i_mutex);
1125         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1126                                                    size);
1127         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1128 out:
1129         return rc;
1130 }
1131
1132 static ssize_t
1133 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1134                   size_t size)
1135 {
1136         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1137                                        value, size);
1138 }
1139
1140 static ssize_t
1141 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1142 {
1143         int rc = 0;
1144         struct dentry *lower_dentry;
1145
1146         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1147         if (!lower_dentry->d_inode->i_op->listxattr) {
1148                 rc = -EOPNOTSUPP;
1149                 goto out;
1150         }
1151         mutex_lock(&lower_dentry->d_inode->i_mutex);
1152         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1153         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1154 out:
1155         return rc;
1156 }
1157
1158 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1159 {
1160         int rc = 0;
1161         struct dentry *lower_dentry;
1162
1163         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1164         if (!lower_dentry->d_inode->i_op->removexattr) {
1165                 rc = -EOPNOTSUPP;
1166                 goto out;
1167         }
1168         mutex_lock(&lower_dentry->d_inode->i_mutex);
1169         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1170         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1171 out:
1172         return rc;
1173 }
1174
1175 const struct inode_operations ecryptfs_symlink_iops = {
1176         .readlink = ecryptfs_readlink,
1177         .follow_link = ecryptfs_follow_link,
1178         .put_link = ecryptfs_put_link,
1179         .permission = ecryptfs_permission,
1180         .setattr = ecryptfs_setattr,
1181         .getattr = ecryptfs_getattr_link,
1182         .setxattr = ecryptfs_setxattr,
1183         .getxattr = ecryptfs_getxattr,
1184         .listxattr = ecryptfs_listxattr,
1185         .removexattr = ecryptfs_removexattr
1186 };
1187
1188 const struct inode_operations ecryptfs_dir_iops = {
1189         .create = ecryptfs_create,
1190         .lookup = ecryptfs_lookup,
1191         .link = ecryptfs_link,
1192         .unlink = ecryptfs_unlink,
1193         .symlink = ecryptfs_symlink,
1194         .mkdir = ecryptfs_mkdir,
1195         .rmdir = ecryptfs_rmdir,
1196         .mknod = ecryptfs_mknod,
1197         .rename = ecryptfs_rename,
1198         .permission = ecryptfs_permission,
1199         .setattr = ecryptfs_setattr,
1200         .setxattr = ecryptfs_setxattr,
1201         .getxattr = ecryptfs_getxattr,
1202         .listxattr = ecryptfs_listxattr,
1203         .removexattr = ecryptfs_removexattr
1204 };
1205
1206 const struct inode_operations ecryptfs_main_iops = {
1207         .permission = ecryptfs_permission,
1208         .setattr = ecryptfs_setattr,
1209         .getattr = ecryptfs_getattr,
1210         .setxattr = ecryptfs_setxattr,
1211         .getxattr = ecryptfs_getxattr,
1212         .listxattr = ecryptfs_listxattr,
1213         .removexattr = ecryptfs_removexattr
1214 };