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 *lower_inode)
  62 {
  63         ecryptfs_set_inode_lower(inode, (struct inode *)lower_inode);
  64         inode->i_ino = ((struct inode *)lower_inode)->i_ino;
  65         inode->i_version++;
  66         inode->i_op = &ecryptfs_main_iops;
  67         inode->i_fop = &ecryptfs_main_fops;
  68         inode->i_mapping->a_ops = &ecryptfs_aops;
  69         return 0;
  70 }
  71
  72 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
  73                                  struct super_block *sb)
  74 {
  75         struct inode *inode;
  76         int rc = 0;
  77
  78         if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) {
  79                 rc = -EXDEV;
  80                 goto out;
  81         }
  82         if (!igrab(lower_inode)) {
  83                 rc = -ESTALE;
  84                 goto out;
  85         }
  86         inode = iget5_locked(sb, (unsigned long)lower_inode,
  87                              ecryptfs_inode_test, ecryptfs_inode_set,
  88                              lower_inode);
  89         if (!inode) {
  90                 rc = -EACCES;
  91                 iput(lower_inode);
  92                 goto out;
  93         }
  94         if (inode->i_state & I_NEW)
  95                 unlock_new_inode(inode);
  96         else
  97                 iput(lower_inode);
  98         if (S_ISLNK(lower_inode->i_mode))
  99                 inode->i_op = &ecryptfs_symlink_iops;
 100         else if (S_ISDIR(lower_inode->i_mode))
 101                 inode->i_op = &ecryptfs_dir_iops;
 102         if (S_ISDIR(lower_inode->i_mode))
 103                 inode->i_fop = &ecryptfs_dir_fops;
 104         if (special_file(lower_inode->i_mode))
 105                 init_special_inode(inode, lower_inode->i_mode,
 106                                    lower_inode->i_rdev);
 107         fsstack_copy_attr_all(inode, lower_inode);
 108         /* This size will be overwritten for real files w/ headers and
 109          * other metadata */
 110         fsstack_copy_inode_size(inode, lower_inode);
 111         return inode;
 112 out:
 113         return ERR_PTR(rc);
 114 }
 115
 116 #define ECRYPTFS_INTERPOSE_FLAG_D_ADD                 0x00000001
 117 /**
 118  * ecryptfs_interpose
 119  * @lower_dentry: Existing dentry in the lower filesystem
 120  * @dentry: ecryptfs' dentry
 121  * @sb: ecryptfs's super_block
 122  * @flags: flags to govern behavior of interpose procedure
 123  *
 124  * Interposes upper and lower dentries.
 125  *
 126  * Returns zero on success; non-zero otherwise
 127  */
 128 static int ecryptfs_interpose(struct dentry *lower_dentry,
 129                               struct dentry *dentry, struct super_block *sb,
 130                               u32 flags)
 131 {
 132         struct inode *lower_inode = lower_dentry->d_inode;
 133         struct inode *inode = ecryptfs_get_inode(lower_inode, sb);
 134         if (IS_ERR(inode))
 135                 return PTR_ERR(inode);
 136         if (flags & ECRYPTFS_INTERPOSE_FLAG_D_ADD)
 137                 d_add(dentry, inode);
 138         else
 139                 d_instantiate(dentry, inode);
 140         return 0;
 141 }
 142
 143 /**
 144  * ecryptfs_create_underlying_file
 145  * @lower_dir_inode: inode of the parent in the lower fs of the new file
 146  * @dentry: New file's dentry
 147  * @mode: The mode of the new file
 148  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 149  *
 150  * Creates the file in the lower file system.
 151  *
 152  * Returns zero on success; non-zero on error condition
 153  */
 154 static int
 155 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
 156                                 struct dentry *dentry, int mode,
 157                                 struct nameidata *nd)
 158 {
 159         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 160         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
 161         struct dentry *dentry_save;
 162         struct vfsmount *vfsmount_save;
 163         unsigned int flags_save;
 164         int rc;
 165
 166         if (nd) {
 167                 dentry_save = nd->path.dentry;
 168                 vfsmount_save = nd->path.mnt;
 169                 flags_save = nd->flags;
 170                 nd->path.dentry = lower_dentry;
 171                 nd->path.mnt = lower_mnt;
 172                 nd->flags &= ~LOOKUP_OPEN;
 173         }
 174         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
 175         if (nd) {
 176                 nd->path.dentry = dentry_save;
 177                 nd->path.mnt = vfsmount_save;
 178                 nd->flags = flags_save;
 179         }
 180         return rc;
 181 }
 182
 183 /**
 184  * ecryptfs_do_create
 185  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
 186  * @ecryptfs_dentry: New file's dentry in ecryptfs
 187  * @mode: The mode of the new file
 188  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 189  *
 190  * Creates the underlying file and the eCryptfs inode which will link to
 191  * it. It will also update the eCryptfs directory inode to mimic the
 192  * stat of the lower directory inode.
 193  *
 194  * Returns zero on success; non-zero on error condition
 195  */
 196 static int
 197 ecryptfs_do_create(struct inode *directory_inode,
 198                    struct dentry *ecryptfs_dentry, int mode,
 199                    struct nameidata *nd)
 200 {
 201         int rc;
 202         struct dentry *lower_dentry;
 203         struct dentry *lower_dir_dentry;
 204
 205         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 206         lower_dir_dentry = lock_parent(lower_dentry);
 207         if (IS_ERR(lower_dir_dentry)) {
 208                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 209                                 "dentry\n");
 210                 rc = PTR_ERR(lower_dir_dentry);
 211                 goto out;
 212         }
 213         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 214                                              ecryptfs_dentry, mode, nd);
 215         if (rc) {
 216                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 217                        "rc = [%d]\n", __func__, rc);
 218                 goto out_lock;
 219         }
 220         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 221                                 directory_inode->i_sb, 0);
 222         if (rc) {
 223                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 224                 goto out_lock;
 225         }
 226         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 227         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 228 out_lock:
 229         unlock_dir(lower_dir_dentry);
 230 out:
 231         return rc;
 232 }
 233
 234 /**
 235  * ecryptfs_initialize_file
 236  *
 237  * Cause the file to be changed from a basic empty file to an ecryptfs
 238  * file with a header and first data page.
 239  *
 240  * Returns zero on success
 241  */
 242 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 243 {
 244         struct ecryptfs_crypt_stat *crypt_stat =
 245                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 246         int rc = 0;
 247
 248         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 249                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 250                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 251                 goto out;
 252         }
 253         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 254         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 255         if (rc) {
 256                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 257                                 "context; rc = [%d]\n", rc);
 258                 goto out;
 259         }
 260         rc = ecryptfs_get_lower_file(ecryptfs_dentry);
 261         if (rc) {
 262                 printk(KERN_ERR "%s: Error attempting to initialize "
 263                         "the lower file for the dentry with name "
 264                         "[%s]; rc = [%d]\n", __func__,
 265                         ecryptfs_dentry->d_name.name, rc);
 266                 goto out;
 267         }
 268         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 269         if (rc)
 270                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 271         ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 272 out:
 273         return rc;
 274 }
 275
 276 /**
 277  * ecryptfs_create
 278  * @dir: The inode of the directory in which to create the file.
 279  * @dentry: The eCryptfs dentry
 280  * @mode: The mode of the new file.
 281  * @nd: nameidata
 282  *
 283  * Creates a new file.
 284  *
 285  * Returns zero on success; non-zero on error condition
 286  */
 287 static int
 288 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 289                 int mode, struct nameidata *nd)
 290 {
 291         int rc;
 292
 293         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 294         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 295         if (unlikely(rc)) {
 296                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 297                                 "lower filesystem\n");
 298                 goto out;
 299         }
 300         /* At this point, a file exists on "disk"; we need to make sure
 301          * that this on disk file is prepared to be an ecryptfs file */
 302         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 303 out:
 304         return rc;
 305 }
 306
 307 /**
 308  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
 309  */
 310 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 311                                         struct dentry *lower_dentry,
 312                                         struct inode *ecryptfs_dir_inode)
 313 {
 314         struct dentry *lower_dir_dentry;
 315         struct vfsmount *lower_mnt;
 316         struct inode *lower_inode;
 317         struct ecryptfs_crypt_stat *crypt_stat;
 318         char *page_virt = NULL;
 319         int put_lower = 0, rc = 0;
 320
 321         lower_dir_dentry = lower_dentry->d_parent;
 322         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 323                                    ecryptfs_dentry->d_parent));
 324         lower_inode = lower_dentry->d_inode;
 325         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
 326         BUG_ON(!lower_dentry->d_count);
 327         ecryptfs_set_dentry_private(ecryptfs_dentry,
 328                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
 329                                                      GFP_KERNEL));
 330         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
 331                 rc = -ENOMEM;
 332                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 333                        "to allocate ecryptfs_dentry_info struct\n",
 334                         __func__);
 335                 goto out_put;
 336         }
 337         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 338         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
 339         if (!lower_dentry->d_inode) {
 340                 /* We want to add because we couldn't find in lower */
 341                 d_add(ecryptfs_dentry, NULL);
 342                 goto out;
 343         }
 344         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 345                                 ecryptfs_dir_inode->i_sb,
 346                                 ECRYPTFS_INTERPOSE_FLAG_D_ADD);
 347         if (rc) {
 348                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
 349                        __func__, rc);
 350                 goto out;
 351         }
 352         if (S_ISDIR(lower_inode->i_mode))
 353                 goto out;
 354         if (S_ISLNK(lower_inode->i_mode))
 355                 goto out;
 356         if (special_file(lower_inode->i_mode))
 357                 goto out;
 358         /* Released in this function */
 359         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
 360         if (!page_virt) {
 361                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
 362                        __func__);
 363                 rc = -ENOMEM;
 364                 goto out;
 365         }
 366         rc = ecryptfs_get_lower_file(ecryptfs_dentry);
 367         if (rc) {
 368                 printk(KERN_ERR "%s: Error attempting to initialize "
 369                         "the lower file for the dentry with name "
 370                         "[%s]; rc = [%d]\n", __func__,
 371                         ecryptfs_dentry->d_name.name, rc);
 372                 goto out_free_kmem;
 373         }
 374         put_lower = 1;
 375         crypt_stat = &ecryptfs_inode_to_private(
 376                                         ecryptfs_dentry->d_inode)->crypt_stat;
 377         /* TODO: lock for crypt_stat comparison */
 378         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 379                         ecryptfs_set_default_sizes(crypt_stat);
 380         rc = ecryptfs_read_and_validate_header_region(page_virt,
 381                                                       ecryptfs_dentry->d_inode);
 382         if (rc) {
 383                 memset(page_virt, 0, PAGE_CACHE_SIZE);
 384                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 385                                                              ecryptfs_dentry);
 386                 if (rc) {
 387                         rc = 0;
 388                         goto out_free_kmem;
 389                 }
 390                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 391         }
 392         ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode);
 393 out_free_kmem:
 394         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 395         goto out;
 396 out_put:
 397         dput(lower_dentry);
 398         mntput(lower_mnt);
 399         d_drop(ecryptfs_dentry);
 400 out:
 401         if (put_lower)
 402                 ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
 403         return rc;
 404 }
 405
 406 /**
 407  * ecryptfs_lookup
 408  * @ecryptfs_dir_inode: The eCryptfs directory inode
 409  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 410  * @ecryptfs_nd: nameidata; may be NULL
 411  *
 412  * Find a file on disk. If the file does not exist, then we'll add it to the
 413  * dentry cache and continue on to read it from the disk.
 414  */
 415 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 416                                       struct dentry *ecryptfs_dentry,
 417                                       struct nameidata *ecryptfs_nd)
 418 {
 419         char *encrypted_and_encoded_name = NULL;
 420         size_t encrypted_and_encoded_name_size;
 421         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 422         struct dentry *lower_dir_dentry, *lower_dentry;
 423         int rc = 0;
 424
 425         if ((ecryptfs_dentry->d_name.len == 1
 426              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 427             || (ecryptfs_dentry->d_name.len == 2
 428                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 429                 goto out_d_drop;
 430         }
 431         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 432         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 433         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 434                                       lower_dir_dentry,
 435                                       ecryptfs_dentry->d_name.len);
 436         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 437         if (IS_ERR(lower_dentry)) {
 438                 rc = PTR_ERR(lower_dentry);
 439                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 440                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 441                                 encrypted_and_encoded_name);
 442                 goto out_d_drop;
 443         }
 444         if (lower_dentry->d_inode)
 445                 goto lookup_and_interpose;
 446         mount_crypt_stat = &ecryptfs_superblock_to_private(
 447                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 448         if (!(mount_crypt_stat
 449             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 450                 goto lookup_and_interpose;
 451         dput(lower_dentry);
 452         rc = ecryptfs_encrypt_and_encode_filename(
 453                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 454                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 455                 ecryptfs_dentry->d_name.len);
 456         if (rc) {
 457                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 458                        "filename; rc = [%d]\n", __func__, rc);
 459                 goto out_d_drop;
 460         }
 461         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 462         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 463                                       lower_dir_dentry,
 464                                       encrypted_and_encoded_name_size);
 465         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 466         if (IS_ERR(lower_dentry)) {
 467                 rc = PTR_ERR(lower_dentry);
 468                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 469                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 470                                 encrypted_and_encoded_name);
 471                 goto out_d_drop;
 472         }
 473 lookup_and_interpose:
 474         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
 475                                                  ecryptfs_dir_inode);
 476         goto out;
 477 out_d_drop:
 478         d_drop(ecryptfs_dentry);
 479 out:
 480         kfree(encrypted_and_encoded_name);
 481         return ERR_PTR(rc);
 482 }
 483
 484 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 485                          struct dentry *new_dentry)
 486 {
 487         struct dentry *lower_old_dentry;
 488         struct dentry *lower_new_dentry;
 489         struct dentry *lower_dir_dentry;
 490         u64 file_size_save;
 491         int rc;
 492
 493         file_size_save = i_size_read(old_dentry->d_inode);
 494         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 495         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 496         dget(lower_old_dentry);
 497         dget(lower_new_dentry);
 498         lower_dir_dentry = lock_parent(lower_new_dentry);
 499         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 500                       lower_new_dentry);
 501         if (rc || !lower_new_dentry->d_inode)
 502                 goto out_lock;
 503         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
 504         if (rc)
 505                 goto out_lock;
 506         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 507         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 508         old_dentry->d_inode->i_nlink =
 509                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 510         i_size_write(new_dentry->d_inode, file_size_save);
 511 out_lock:
 512         unlock_dir(lower_dir_dentry);
 513         dput(lower_new_dentry);
 514         dput(lower_old_dentry);
 515         return rc;
 516 }
 517
 518 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 519 {
 520         int rc = 0;
 521         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 522         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 523         struct dentry *lower_dir_dentry;
 524
 525         dget(lower_dentry);
 526         lower_dir_dentry = lock_parent(lower_dentry);
 527         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 528         if (rc) {
 529                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 530                 goto out_unlock;
 531         }
 532         fsstack_copy_attr_times(dir, lower_dir_inode);
 533         dentry->d_inode->i_nlink =
 534                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 535         dentry->d_inode->i_ctime = dir->i_ctime;
 536         d_drop(dentry);
 537 out_unlock:
 538         unlock_dir(lower_dir_dentry);
 539         dput(lower_dentry);
 540         return rc;
 541 }
 542
 543 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 544                             const char *symname)
 545 {
 546         int rc;
 547         struct dentry *lower_dentry;
 548         struct dentry *lower_dir_dentry;
 549         char *encoded_symname;
 550         size_t encoded_symlen;
 551         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 552
 553         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 554         dget(lower_dentry);
 555         lower_dir_dentry = lock_parent(lower_dentry);
 556         mount_crypt_stat = &ecryptfs_superblock_to_private(
 557                 dir->i_sb)->mount_crypt_stat;
 558         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 559                                                   &encoded_symlen,
 560                                                   NULL,
 561                                                   mount_crypt_stat, symname,
 562                                                   strlen(symname));
 563         if (rc)
 564                 goto out_lock;
 565         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 566                          encoded_symname);
 567         kfree(encoded_symname);
 568         if (rc || !lower_dentry->d_inode)
 569                 goto out_lock;
 570         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 571         if (rc)
 572                 goto out_lock;
 573         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 574         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 575 out_lock:
 576         unlock_dir(lower_dir_dentry);
 577         dput(lower_dentry);
 578         if (!dentry->d_inode)
 579                 d_drop(dentry);
 580         return rc;
 581 }
 582
 583 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 584 {
 585         int rc;
 586         struct dentry *lower_dentry;
 587         struct dentry *lower_dir_dentry;
 588
 589         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 590         lower_dir_dentry = lock_parent(lower_dentry);
 591         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 592         if (rc || !lower_dentry->d_inode)
 593                 goto out;
 594         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 595         if (rc)
 596                 goto out;
 597         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 598         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 599         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 600 out:
 601         unlock_dir(lower_dir_dentry);
 602         if (!dentry->d_inode)
 603                 d_drop(dentry);
 604         return rc;
 605 }
 606
 607 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 608 {
 609         struct dentry *lower_dentry;
 610         struct dentry *lower_dir_dentry;
 611         int rc;
 612
 613         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 614         dget(dentry);
 615         lower_dir_dentry = lock_parent(lower_dentry);
 616         dget(lower_dentry);
 617         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 618         dput(lower_dentry);
 619         if (!rc && dentry->d_inode)
 620                 clear_nlink(dentry->d_inode);
 621         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 622         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 623         unlock_dir(lower_dir_dentry);
 624         if (!rc)
 625                 d_drop(dentry);
 626         dput(dentry);
 627         return rc;
 628 }
 629
 630 static int
 631 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 632 {
 633         int rc;
 634         struct dentry *lower_dentry;
 635         struct dentry *lower_dir_dentry;
 636
 637         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 638         lower_dir_dentry = lock_parent(lower_dentry);
 639         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 640         if (rc || !lower_dentry->d_inode)
 641                 goto out;
 642         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 643         if (rc)
 644                 goto out;
 645         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 646         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 647 out:
 648         unlock_dir(lower_dir_dentry);
 649         if (!dentry->d_inode)
 650                 d_drop(dentry);
 651         return rc;
 652 }
 653
 654 static int
 655 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 656                 struct inode *new_dir, struct dentry *new_dentry)
 657 {
 658         int rc;
 659         struct dentry *lower_old_dentry;
 660         struct dentry *lower_new_dentry;
 661         struct dentry *lower_old_dir_dentry;
 662         struct dentry *lower_new_dir_dentry;
 663         struct dentry *trap = NULL;
 664
 665         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 666         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 667         dget(lower_old_dentry);
 668         dget(lower_new_dentry);
 669         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 670         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 671         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 672         /* source should not be ancestor of target */
 673         if (trap == lower_old_dentry) {
 674                 rc = -EINVAL;
 675                 goto out_lock;
 676         }
 677         /* target should not be ancestor of source */
 678         if (trap == lower_new_dentry) {
 679                 rc = -ENOTEMPTY;
 680                 goto out_lock;
 681         }
 682         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 683                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 684         if (rc)
 685                 goto out_lock;
 686         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 687         if (new_dir != old_dir)
 688                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 689 out_lock:
 690         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 691         dput(lower_new_dir_dentry);
 692         dput(lower_old_dir_dentry);
 693         dput(lower_new_dentry);
 694         dput(lower_old_dentry);
 695         return rc;
 696 }
 697
 698 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 699                                    size_t *bufsiz)
 700 {
 701         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 702         char *lower_buf;
 703         size_t lower_bufsiz = PATH_MAX;
 704         mm_segment_t old_fs;
 705         int rc;
 706
 707         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 708         if (!lower_buf) {
 709                 rc = -ENOMEM;
 710                 goto out;
 711         }
 712         old_fs = get_fs();
 713         set_fs(get_ds());
 714         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 715                                                    (char __user *)lower_buf,
 716                                                    lower_bufsiz);
 717         set_fs(old_fs);
 718         if (rc < 0)
 719                 goto out;
 720         lower_bufsiz = rc;
 721         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 722                                                   lower_buf, lower_bufsiz);
 723 out:
 724         kfree(lower_buf);
 725         return rc;
 726 }
 727
 728 static int
 729 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 730 {
 731         char *kbuf;
 732         size_t kbufsiz, copied;
 733         int rc;
 734
 735         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 736         if (rc)
 737                 goto out;
 738         copied = min_t(size_t, bufsiz, kbufsiz);
 739         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 740         kfree(kbuf);
 741         fsstack_copy_attr_atime(dentry->d_inode,
 742                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 743 out:
 744         return rc;
 745 }
 746
 747 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 748 {
 749         char *buf;
 750         int len = PAGE_SIZE, rc;
 751         mm_segment_t old_fs;
 752
 753         /* Released in ecryptfs_put_link(); only release here on error */
 754         buf = kmalloc(len, GFP_KERNEL);
 755         if (!buf) {
 756                 buf = ERR_PTR(-ENOMEM);
 757                 goto out;
 758         }
 759         old_fs = get_fs();
 760         set_fs(get_ds());
 761         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 762         set_fs(old_fs);
 763         if (rc < 0) {
 764                 kfree(buf);
 765                 buf = ERR_PTR(rc);
 766         } else
 767                 buf[rc] = '\0';
 768 out:
 769         nd_set_link(nd, buf);
 770         return NULL;
 771 }
 772
 773 static void
 774 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 775 {
 776         char *buf = nd_get_link(nd);
 777         if (!IS_ERR(buf)) {
 778                 /* Free the char* */
 779                 kfree(buf);
 780         }
 781 }
 782
 783 /**
 784  * upper_size_to_lower_size
 785  * @crypt_stat: Crypt_stat associated with file
 786  * @upper_size: Size of the upper file
 787  *
 788  * Calculate the required size of the lower file based on the
 789  * specified size of the upper file. This calculation is based on the
 790  * number of headers in the underlying file and the extent size.
 791  *
 792  * Returns Calculated size of the lower file.
 793  */
 794 static loff_t
 795 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 796                          loff_t upper_size)
 797 {
 798         loff_t lower_size;
 799
 800         lower_size = ecryptfs_lower_header_size(crypt_stat);
 801         if (upper_size != 0) {
 802                 loff_t num_extents;
 803
 804                 num_extents = upper_size >> crypt_stat->extent_shift;
 805                 if (upper_size & ~crypt_stat->extent_mask)
 806                         num_extents++;
 807                 lower_size += (num_extents * crypt_stat->extent_size);
 808         }
 809         return lower_size;
 810 }
 811
 812 /**
 813  * truncate_upper
 814  * @dentry: The ecryptfs layer dentry
 815  * @ia: Address of the ecryptfs inode's attributes
 816  * @lower_ia: Address of the lower inode's attributes
 817  *
 818  * Function to handle truncations modifying the size of the file. Note
 819  * that the file sizes are interpolated. When expanding, we are simply
 820  * writing strings of 0's out. When truncating, we truncate the upper
 821  * inode and update the lower_ia according to the page index
 822  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 823  * the caller must use lower_ia in a call to notify_change() to perform
 824  * the truncation of the lower inode.
 825  *
 826  * Returns zero on success; non-zero otherwise
 827  */
 828 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 829                           struct iattr *lower_ia)
 830 {
 831         int rc = 0;
 832         struct inode *inode = dentry->d_inode;
 833         struct ecryptfs_crypt_stat *crypt_stat;
 834         loff_t i_size = i_size_read(inode);
 835         loff_t lower_size_before_truncate;
 836         loff_t lower_size_after_truncate;
 837
 838         if (unlikely((ia->ia_size == i_size))) {
 839                 lower_ia->ia_valid &= ~ATTR_SIZE;
 840                 return 0;
 841         }
 842         rc = ecryptfs_get_lower_file(dentry);
 843         if (rc)
 844                 return rc;
 845         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 846         /* Switch on growing or shrinking file */
 847         if (ia->ia_size > i_size) {
 848                 char zero[] = { 0x00 };
 849
 850                 lower_ia->ia_valid &= ~ATTR_SIZE;
 851                 /* Write a single 0 at the last position of the file;
 852                  * this triggers code that will fill in 0's throughout
 853                  * the intermediate portion of the previous end of the
 854                  * file and the new and of the file */
 855                 rc = ecryptfs_write(inode, zero,
 856                                     (ia->ia_size - 1), 1);
 857         } else { /* ia->ia_size < i_size_read(inode) */
 858                 /* We're chopping off all the pages down to the page
 859                  * in which ia->ia_size is located. Fill in the end of
 860                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 861                  * PAGE_CACHE_SIZE with zeros. */
 862                 size_t num_zeros = (PAGE_CACHE_SIZE
 863                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 864
 865
 866                 /*
 867                  * XXX(truncate) this should really happen at the begginning
 868                  * of ->setattr.  But the code is too messy to that as part
 869                  * of a larger patch.  ecryptfs is also totally missing out
 870                  * on the inode_change_ok check at the beginning of
 871                  * ->setattr while would include this.
 872                  */
 873                 rc = inode_newsize_ok(inode, ia->ia_size);
 874                 if (rc)
 875                         goto out;
 876
 877                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 878                         truncate_setsize(inode, ia->ia_size);
 879                         lower_ia->ia_size = ia->ia_size;
 880                         lower_ia->ia_valid |= ATTR_SIZE;
 881                         goto out;
 882                 }
 883                 if (num_zeros) {
 884                         char *zeros_virt;
 885
 886                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 887                         if (!zeros_virt) {
 888                                 rc = -ENOMEM;
 889                                 goto out;
 890                         }
 891                         rc = ecryptfs_write(inode, zeros_virt,
 892                                             ia->ia_size, num_zeros);
 893                         kfree(zeros_virt);
 894                         if (rc) {
 895                                 printk(KERN_ERR "Error attempting to zero out "
 896                                        "the remainder of the end page on "
 897                                        "reducing truncate; rc = [%d]\n", rc);
 898                                 goto out;
 899                         }
 900                 }
 901                 truncate_setsize(inode, ia->ia_size);
 902                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 903                 if (rc) {
 904                         printk(KERN_ERR "Problem with "
 905                                "ecryptfs_write_inode_size_to_metadata; "
 906                                "rc = [%d]\n", rc);
 907                         goto out;
 908                 }
 909                 /* We are reducing the size of the ecryptfs file, and need to
 910                  * know if we need to reduce the size of the lower file. */
 911                 lower_size_before_truncate =
 912                     upper_size_to_lower_size(crypt_stat, i_size);
 913                 lower_size_after_truncate =
 914                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 915                 if (lower_size_after_truncate < lower_size_before_truncate) {
 916                         lower_ia->ia_size = lower_size_after_truncate;
 917                         lower_ia->ia_valid |= ATTR_SIZE;
 918                 } else
 919                         lower_ia->ia_valid &= ~ATTR_SIZE;
 920         }
 921 out:
 922         ecryptfs_put_lower_file(inode);
 923         return rc;
 924 }
 925
 926 /**
 927  * ecryptfs_truncate
 928  * @dentry: The ecryptfs layer dentry
 929  * @new_length: The length to expand the file to
 930  *
 931  * Simple function that handles the truncation of an eCryptfs inode and
 932  * its corresponding lower inode.
 933  *
 934  * Returns zero on success; non-zero otherwise
 935  */
 936 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 937 {
 938         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 939         struct iattr lower_ia = { .ia_valid = 0 };
 940         int rc;
 941
 942         rc = truncate_upper(dentry, &ia, &lower_ia);
 943         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 944                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 945
 946                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 947                 rc = notify_change(lower_dentry, &lower_ia);
 948                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 949         }
 950         return rc;
 951 }
 952
 953 static int
 954 ecryptfs_permission(struct inode *inode, int mask, unsigned int flags)
 955 {
 956         if (flags & IPERM_FLAG_RCU)
 957                 return -ECHILD;
 958         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 959 }
 960
 961 /**
 962  * ecryptfs_setattr
 963  * @dentry: dentry handle to the inode to modify
 964  * @ia: Structure with flags of what to change and values
 965  *
 966  * Updates the metadata of an inode. If the update is to the size
 967  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 968  * of both the ecryptfs inode and the lower inode.
 969  *
 970  * All other metadata changes will be passed right to the lower filesystem,
 971  * and we will just update our inode to look like the lower.
 972  */
 973 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 974 {
 975         int rc = 0;
 976         struct dentry *lower_dentry;
 977         struct iattr lower_ia;
 978         struct inode *inode;
 979         struct inode *lower_inode;
 980         struct ecryptfs_crypt_stat *crypt_stat;
 981
 982         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 983         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 984                 ecryptfs_init_crypt_stat(crypt_stat);
 985         inode = dentry->d_inode;
 986         lower_inode = ecryptfs_inode_to_lower(inode);
 987         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 988         mutex_lock(&crypt_stat->cs_mutex);
 989         if (S_ISDIR(dentry->d_inode->i_mode))
 990                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 991         else if (S_ISREG(dentry->d_inode->i_mode)
 992                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 993                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 994                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 995
 996                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 997                         dentry->d_sb)->mount_crypt_stat;
 998                 rc = ecryptfs_get_lower_file(dentry);
 999                 if (rc) {
1000                         mutex_unlock(&crypt_stat->cs_mutex);
1001                         goto out;
1002                 }
1003                 rc = ecryptfs_read_metadata(dentry);
1004                 ecryptfs_put_lower_file(inode);
1005                 if (rc) {
1006                         if (!(mount_crypt_stat->flags
1007                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
1008                                 rc = -EIO;
1009                                 printk(KERN_WARNING "Either the lower file "
1010                                        "is not in a valid eCryptfs format, "
1011                                        "or the key could not be retrieved. "
1012                                        "Plaintext passthrough mode is not "
1013                                        "enabled; returning -EIO\n");
1014                                 mutex_unlock(&crypt_stat->cs_mutex);
1015                                 goto out;
1016                         }
1017                         rc = 0;
1018                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
1019                                                | ECRYPTFS_ENCRYPTED);
1020                 }
1021         }
1022         mutex_unlock(&crypt_stat->cs_mutex);
1023         if (S_ISREG(inode->i_mode)) {
1024                 rc = filemap_write_and_wait(inode->i_mapping);
1025                 if (rc)
1026                         goto out;
1027                 fsstack_copy_attr_all(inode, lower_inode);
1028         }
1029         memcpy(&lower_ia, ia, sizeof(lower_ia));
1030         if (ia->ia_valid & ATTR_FILE)
1031                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1032         if (ia->ia_valid & ATTR_SIZE) {
1033                 rc = truncate_upper(dentry, ia, &lower_ia);
1034                 if (rc < 0)
1035                         goto out;
1036         }
1037
1038         /*
1039          * mode change is for clearing setuid/setgid bits. Allow lower fs
1040          * to interpret this in its own way.
1041          */
1042         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1043                 lower_ia.ia_valid &= ~ATTR_MODE;
1044
1045         mutex_lock(&lower_dentry->d_inode->i_mutex);
1046         rc = notify_change(lower_dentry, &lower_ia);
1047         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1048 out:
1049         fsstack_copy_attr_all(inode, lower_inode);
1050         return rc;
1051 }
1052
1053 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1054                           struct kstat *stat)
1055 {
1056         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1057         int rc = 0;
1058
1059         mount_crypt_stat = &ecryptfs_superblock_to_private(
1060                                                 dentry->d_sb)->mount_crypt_stat;
1061         generic_fillattr(dentry->d_inode, stat);
1062         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1063                 char *target;
1064                 size_t targetsiz;
1065
1066                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1067                 if (!rc) {
1068                         kfree(target);
1069                         stat->size = targetsiz;
1070                 }
1071         }
1072         return rc;
1073 }
1074
1075 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1076                      struct kstat *stat)
1077 {
1078         struct kstat lower_stat;
1079         int rc;
1080
1081         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1082                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1083         if (!rc) {
1084                 fsstack_copy_attr_all(dentry->d_inode,
1085                                       ecryptfs_inode_to_lower(dentry->d_inode));
1086                 generic_fillattr(dentry->d_inode, stat);
1087                 stat->blocks = lower_stat.blocks;
1088         }
1089         return rc;
1090 }
1091
1092 int
1093 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1094                   size_t size, int flags)
1095 {
1096         int rc = 0;
1097         struct dentry *lower_dentry;
1098
1099         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1100         if (!lower_dentry->d_inode->i_op->setxattr) {
1101                 rc = -EOPNOTSUPP;
1102                 goto out;
1103         }
1104
1105         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1106 out:
1107         return rc;
1108 }
1109
1110 ssize_t
1111 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1112                         void *value, size_t size)
1113 {
1114         int rc = 0;
1115
1116         if (!lower_dentry->d_inode->i_op->getxattr) {
1117                 rc = -EOPNOTSUPP;
1118                 goto out;
1119         }
1120         mutex_lock(&lower_dentry->d_inode->i_mutex);
1121         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1122                                                    size);
1123         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1124 out:
1125         return rc;
1126 }
1127
1128 static ssize_t
1129 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1130                   size_t size)
1131 {
1132         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1133                                        value, size);
1134 }
1135
1136 static ssize_t
1137 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1138 {
1139         int rc = 0;
1140         struct dentry *lower_dentry;
1141
1142         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1143         if (!lower_dentry->d_inode->i_op->listxattr) {
1144                 rc = -EOPNOTSUPP;
1145                 goto out;
1146         }
1147         mutex_lock(&lower_dentry->d_inode->i_mutex);
1148         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1149         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1150 out:
1151         return rc;
1152 }
1153
1154 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1155 {
1156         int rc = 0;
1157         struct dentry *lower_dentry;
1158
1159         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1160         if (!lower_dentry->d_inode->i_op->removexattr) {
1161                 rc = -EOPNOTSUPP;
1162                 goto out;
1163         }
1164         mutex_lock(&lower_dentry->d_inode->i_mutex);
1165         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1166         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1167 out:
1168         return rc;
1169 }
1170
1171 const struct inode_operations ecryptfs_symlink_iops = {
1172         .readlink = ecryptfs_readlink,
1173         .follow_link = ecryptfs_follow_link,
1174         .put_link = ecryptfs_put_link,
1175         .permission = ecryptfs_permission,
1176         .setattr = ecryptfs_setattr,
1177         .getattr = ecryptfs_getattr_link,
1178         .setxattr = ecryptfs_setxattr,
1179         .getxattr = ecryptfs_getxattr,
1180         .listxattr = ecryptfs_listxattr,
1181         .removexattr = ecryptfs_removexattr
1182 };
1183
1184 const struct inode_operations ecryptfs_dir_iops = {
1185         .create = ecryptfs_create,
1186         .lookup = ecryptfs_lookup,
1187         .link = ecryptfs_link,
1188         .unlink = ecryptfs_unlink,
1189         .symlink = ecryptfs_symlink,
1190         .mkdir = ecryptfs_mkdir,
1191         .rmdir = ecryptfs_rmdir,
1192         .mknod = ecryptfs_mknod,
1193         .rename = ecryptfs_rename,
1194         .permission = ecryptfs_permission,
1195         .setattr = ecryptfs_setattr,
1196         .setxattr = ecryptfs_setxattr,
1197         .getxattr = ecryptfs_getxattr,
1198         .listxattr = ecryptfs_listxattr,
1199         .removexattr = ecryptfs_removexattr
1200 };
1201
1202 const struct inode_operations ecryptfs_main_iops = {
1203         .permission = ecryptfs_permission,
1204         .setattr = ecryptfs_setattr,
1205         .getattr = ecryptfs_getattr,
1206         .setxattr = ecryptfs_setxattr,
1207         .getxattr = ecryptfs_getxattr,
1208         .listxattr = ecryptfs_listxattr,
1209         .removexattr = ecryptfs_removexattr
1210 };