fs/ecryptfs/inode.c

   1 /**
   2  * eCryptfs: Linux filesystem encryption layer
   3  *
   4  * Copyright (C) 1997-2004 Erez Zadok
   5  * Copyright (C) 2001-2004 Stony Brook University
   6  * Copyright (C) 2004-2007 International Business Machines Corp.
   7  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
   8  *              Michael C. Thompsion <mcthomps@us.ibm.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of the
  13  * License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  23  * 02111-1307, USA.
  24  */
  25
  26 #include <linux/file.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/pagemap.h>
  29 #include <linux/dcache.h>
  30 #include <linux/namei.h>
  31 #include <linux/mount.h>
  32 #include <linux/crypto.h>
  33 #include <linux/fs_stack.h>
  34 #include <linux/slab.h>
  35 #include <linux/xattr.h>
  36 #include <asm/unaligned.h>
  37 #include "ecryptfs_kernel.h"
  38
  39 static struct dentry *lock_parent(struct dentry *dentry)
  40 {
  41         struct dentry *dir;
  42
  43         dir = dget_parent(dentry);
  44         mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
  45         return dir;
  46 }
  47
  48 static void unlock_dir(struct dentry *dir)
  49 {
  50         mutex_unlock(&dir->d_inode->i_mutex);
  51         dput(dir);
  52 }
  53
  54 static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
  55 {
  56         if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode)
  57                 return 1;
  58         return 0;
  59 }
  60
  61 static int ecryptfs_inode_set(struct inode *inode, void *opaque)
  62 {
  63         struct inode *lower_inode = opaque;
  64
  65         ecryptfs_set_inode_lower(inode, lower_inode);
  66         fsstack_copy_attr_all(inode, lower_inode);
  67         /* i_size will be overwritten for encrypted regular files */
  68         fsstack_copy_inode_size(inode, lower_inode);
  69         inode->i_ino = lower_inode->i_ino;
  70         inode->i_version++;
  71         inode->i_mapping->a_ops = &ecryptfs_aops;
  72         inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi;
  73
  74         if (S_ISLNK(inode->i_mode))
  75                 inode->i_op = &ecryptfs_symlink_iops;
  76         else if (S_ISDIR(inode->i_mode))
  77                 inode->i_op = &ecryptfs_dir_iops;
  78         else
  79                 inode->i_op = &ecryptfs_main_iops;
  80
  81         if (S_ISDIR(inode->i_mode))
  82                 inode->i_fop = &ecryptfs_dir_fops;
  83         else if (special_file(inode->i_mode))
  84                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  85         else
  86                 inode->i_fop = &ecryptfs_main_fops;
  87
  88         return 0;
  89 }
  90
  91 static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
  92                                           struct super_block *sb)
  93 {
  94         struct inode *inode;
  95
  96         if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
  97                 return ERR_PTR(-EXDEV);
  98         if (!igrab(lower_inode))
  99                 return ERR_PTR(-ESTALE);
 100         inode = iget5_locked(sb, (unsigned long)lower_inode,
 101                              ecryptfs_inode_test, ecryptfs_inode_set,
 102                              lower_inode);
 103         if (!inode) {
 104                 iput(lower_inode);
 105                 return ERR_PTR(-EACCES);
 106         }
 107         if (!(inode->i_state & I_NEW))
 108                 iput(lower_inode);
 109
 110         return inode;
 111 }
 112
 113 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 114                                  struct super_block *sb)
 115 {
 116         struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
 117
 118         if (!IS_ERR(inode) && (inode->i_state & I_NEW))
 119                 unlock_new_inode(inode);
 120
 121         return inode;
 122 }
 123
 124 /**
 125  * ecryptfs_interpose
 126  * @lower_dentry: Existing dentry in the lower filesystem
 127  * @dentry: ecryptfs' dentry
 128  * @sb: ecryptfs's super_block
 129  *
 130  * Interposes upper and lower dentries.
 131  *
 132  * Returns zero on success; non-zero otherwise
 133  */
 134 static int ecryptfs_interpose(struct dentry *lower_dentry,
 135                               struct dentry *dentry, struct super_block *sb)
 136 {
 137         struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb);
 138
 139         if (IS_ERR(inode))
 140                 return PTR_ERR(inode);
 141         d_instantiate(dentry, inode);
 142
 143         return 0;
 144 }
 145
 146 /**
 147  * ecryptfs_create_underlying_file
 148  * @lower_dir_inode: inode of the parent in the lower fs of the new file
 149  * @dentry: New file's dentry
 150  * @mode: The mode of the new file
 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 {
 160         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 161         return vfs_create(lower_dir_inode, lower_dentry, mode, NULL);
 162 }
 163
 164 static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
 165                               struct inode *inode)
 166 {
 167         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 168         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 169         struct dentry *lower_dir_dentry;
 170         int rc;
 171
 172         dget(lower_dentry);
 173         lower_dir_dentry = lock_parent(lower_dentry);
 174         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 175         if (rc) {
 176                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 177                 goto out_unlock;
 178         }
 179         fsstack_copy_attr_times(dir, lower_dir_inode);
 180         set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
 181         inode->i_ctime = dir->i_ctime;
 182         d_drop(dentry);
 183 out_unlock:
 184         unlock_dir(lower_dir_dentry);
 185         dput(lower_dentry);
 186         return rc;
 187 }
 188
 189 /**
 190  * ecryptfs_do_create
 191  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
 192  * @ecryptfs_dentry: New file's dentry in ecryptfs
 193  * @mode: The mode of the new file
 194  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 195  *
 196  * Creates the underlying file and the eCryptfs inode which will link to
 197  * it. It will also update the eCryptfs directory inode to mimic the
 198  * stat of the lower directory inode.
 199  *
 200  * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
 201  */
 202 static struct inode *
 203 ecryptfs_do_create(struct inode *directory_inode,
 204                    struct dentry *ecryptfs_dentry, int mode)
 205 {
 206         int rc;
 207         struct dentry *lower_dentry;
 208         struct dentry *lower_dir_dentry;
 209         struct inode *inode;
 210
 211         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 212         lower_dir_dentry = lock_parent(lower_dentry);
 213         if (IS_ERR(lower_dir_dentry)) {
 214                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 215                                 "dentry\n");
 216                 inode = ERR_CAST(lower_dir_dentry);
 217                 goto out;
 218         }
 219         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 220                                              ecryptfs_dentry, mode);
 221         if (rc) {
 222                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 223                        "rc = [%d]\n", __func__, rc);
 224                 inode = ERR_PTR(rc);
 225                 goto out_lock;
 226         }
 227         inode = __ecryptfs_get_inode(lower_dentry->d_inode,
 228                                      directory_inode->i_sb);
 229         if (IS_ERR(inode)) {
 230                 vfs_unlink(lower_dir_dentry->d_inode, lower_dentry);
 231                 goto out_lock;
 232         }
 233         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 234         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 235 out_lock:
 236         unlock_dir(lower_dir_dentry);
 237 out:
 238         return inode;
 239 }
 240
 241 /**
 242  * ecryptfs_initialize_file
 243  *
 244  * Cause the file to be changed from a basic empty file to an ecryptfs
 245  * file with a header and first data page.
 246  *
 247  * Returns zero on success
 248  */
 249 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
 250                                     struct inode *ecryptfs_inode)
 251 {
 252         struct ecryptfs_crypt_stat *crypt_stat =
 253                 &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
 254         int rc = 0;
 255
 256         if (S_ISDIR(ecryptfs_inode->i_mode)) {
 257                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 258                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 259                 goto out;
 260         }
 261         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 262         rc = ecryptfs_new_file_context(ecryptfs_inode);
 263         if (rc) {
 264                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 265                                 "context; rc = [%d]\n", rc);
 266                 goto out;
 267         }
 268         rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
 269         if (rc) {
 270                 printk(KERN_ERR "%s: Error attempting to initialize "
 271                         "the lower file for the dentry with name "
 272                         "[%s]; rc = [%d]\n", __func__,
 273                         ecryptfs_dentry->d_name.name, rc);
 274                 goto out;
 275         }
 276         rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
 277         if (rc)
 278                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 279         ecryptfs_put_lower_file(ecryptfs_inode);
 280 out:
 281         return rc;
 282 }
 283
 284 /**
 285  * ecryptfs_create
 286  * @dir: The inode of the directory in which to create the file.
 287  * @dentry: The eCryptfs dentry
 288  * @mode: The mode of the new file.
 289  * @nd: nameidata
 290  *
 291  * Creates a new file.
 292  *
 293  * Returns zero on success; non-zero on error condition
 294  */
 295 static int
 296 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 297                 int mode, struct nameidata *nd)
 298 {
 299         struct inode *ecryptfs_inode;
 300         int rc;
 301
 302         ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
 303                                             mode);
 304         if (unlikely(IS_ERR(ecryptfs_inode))) {
 305                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 306                                 "lower filesystem\n");
 307                 rc = PTR_ERR(ecryptfs_inode);
 308                 goto out;
 309         }
 310         /* At this point, a file exists on "disk"; we need to make sure
 311          * that this on disk file is prepared to be an ecryptfs file */
 312         rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
 313         if (rc) {
 314                 ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
 315                                    ecryptfs_inode);
 316                 make_bad_inode(ecryptfs_inode);
 317                 unlock_new_inode(ecryptfs_inode);
 318                 iput(ecryptfs_inode);
 319                 goto out;
 320         }
 321         d_instantiate(ecryptfs_dentry, ecryptfs_inode);
 322         unlock_new_inode(ecryptfs_inode);
 323 out:
 324         return rc;
 325 }
 326
 327 static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
 328 {
 329         struct ecryptfs_crypt_stat *crypt_stat;
 330         int rc;
 331
 332         rc = ecryptfs_get_lower_file(dentry, inode);
 333         if (rc) {
 334                 printk(KERN_ERR "%s: Error attempting to initialize "
 335                         "the lower file for the dentry with name "
 336                         "[%s]; rc = [%d]\n", __func__,
 337                         dentry->d_name.name, rc);
 338                 return rc;
 339         }
 340
 341         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 342         /* TODO: lock for crypt_stat comparison */
 343         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 344                 ecryptfs_set_default_sizes(crypt_stat);
 345
 346         rc = ecryptfs_read_and_validate_header_region(inode);
 347         ecryptfs_put_lower_file(inode);
 348         if (rc) {
 349                 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
 350                 if (!rc)
 351                         crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 352         }
 353
 354         /* Must return 0 to allow non-eCryptfs files to be looked up, too */
 355         return 0;
 356 }
 357
 358 /**
 359  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
 360  */
 361 static int ecryptfs_lookup_interpose(struct dentry *dentry,
 362                                      struct dentry *lower_dentry,
 363                                      struct inode *dir_inode)
 364 {
 365         struct inode *inode, *lower_inode = lower_dentry->d_inode;
 366         struct ecryptfs_dentry_info *dentry_info;
 367         struct vfsmount *lower_mnt;
 368         int rc = 0;
 369
 370         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
 371         fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode);
 372         BUG_ON(!lower_dentry->d_count);
 373
 374         dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
 375         ecryptfs_set_dentry_private(dentry, dentry_info);
 376         if (!dentry_info) {
 377                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 378                        "to allocate ecryptfs_dentry_info struct\n",
 379                         __func__);
 380                 dput(lower_dentry);
 381                 mntput(lower_mnt);
 382                 d_drop(dentry);
 383                 return -ENOMEM;
 384         }
 385         ecryptfs_set_dentry_lower(dentry, lower_dentry);
 386         ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
 387
 388         if (!lower_dentry->d_inode) {
 389                 /* We want to add because we couldn't find in lower */
 390                 d_add(dentry, NULL);
 391                 return 0;
 392         }
 393         inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
 394         if (IS_ERR(inode)) {
 395                 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
 396                        __func__, PTR_ERR(inode));
 397                 return PTR_ERR(inode);
 398         }
 399         if (S_ISREG(inode->i_mode)) {
 400                 rc = ecryptfs_i_size_read(dentry, inode);
 401                 if (rc) {
 402                         make_bad_inode(inode);
 403                         return rc;
 404                 }
 405         }
 406
 407         if (inode->i_state & I_NEW)
 408                 unlock_new_inode(inode);
 409         d_add(dentry, inode);
 410
 411         return rc;
 412 }
 413
 414 /**
 415  * ecryptfs_lookup
 416  * @ecryptfs_dir_inode: The eCryptfs directory inode
 417  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 418  * @ecryptfs_nd: nameidata; may be NULL
 419  *
 420  * Find a file on disk. If the file does not exist, then we'll add it to the
 421  * dentry cache and continue on to read it from the disk.
 422  */
 423 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 424                                       struct dentry *ecryptfs_dentry,
 425                                       struct nameidata *ecryptfs_nd)
 426 {
 427         char *encrypted_and_encoded_name = NULL;
 428         size_t encrypted_and_encoded_name_size;
 429         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 430         struct dentry *lower_dir_dentry, *lower_dentry;
 431         int rc = 0;
 432
 433         if ((ecryptfs_dentry->d_name.len == 1
 434              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 435             || (ecryptfs_dentry->d_name.len == 2
 436                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 437                 goto out_d_drop;
 438         }
 439         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 440         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 441         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 442                                       lower_dir_dentry,
 443                                       ecryptfs_dentry->d_name.len);
 444         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 445         if (IS_ERR(lower_dentry)) {
 446                 rc = PTR_ERR(lower_dentry);
 447                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 448                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 449                                 encrypted_and_encoded_name);
 450                 goto out_d_drop;
 451         }
 452         if (lower_dentry->d_inode)
 453                 goto interpose;
 454         mount_crypt_stat = &ecryptfs_superblock_to_private(
 455                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 456         if (!(mount_crypt_stat
 457             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 458                 goto interpose;
 459         dput(lower_dentry);
 460         rc = ecryptfs_encrypt_and_encode_filename(
 461                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 462                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 463                 ecryptfs_dentry->d_name.len);
 464         if (rc) {
 465                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 466                        "filename; rc = [%d]\n", __func__, rc);
 467                 goto out_d_drop;
 468         }
 469         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 470         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 471                                       lower_dir_dentry,
 472                                       encrypted_and_encoded_name_size);
 473         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 474         if (IS_ERR(lower_dentry)) {
 475                 rc = PTR_ERR(lower_dentry);
 476                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 477                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 478                                 encrypted_and_encoded_name);
 479                 goto out_d_drop;
 480         }
 481 interpose:
 482         rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
 483                                        ecryptfs_dir_inode);
 484         goto out;
 485 out_d_drop:
 486         d_drop(ecryptfs_dentry);
 487 out:
 488         kfree(encrypted_and_encoded_name);
 489         return ERR_PTR(rc);
 490 }
 491
 492 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 493                          struct dentry *new_dentry)
 494 {
 495         struct dentry *lower_old_dentry;
 496         struct dentry *lower_new_dentry;
 497         struct dentry *lower_dir_dentry;
 498         u64 file_size_save;
 499         int rc;
 500
 501         file_size_save = i_size_read(old_dentry->d_inode);
 502         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 503         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 504         dget(lower_old_dentry);
 505         dget(lower_new_dentry);
 506         lower_dir_dentry = lock_parent(lower_new_dentry);
 507         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 508                       lower_new_dentry);
 509         if (rc || !lower_new_dentry->d_inode)
 510                 goto out_lock;
 511         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
 512         if (rc)
 513                 goto out_lock;
 514         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 515         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 516         set_nlink(old_dentry->d_inode,
 517                   ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink);
 518         i_size_write(new_dentry->d_inode, file_size_save);
 519 out_lock:
 520         unlock_dir(lower_dir_dentry);
 521         dput(lower_new_dentry);
 522         dput(lower_old_dentry);
 523         return rc;
 524 }
 525
 526 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 527 {
 528         return ecryptfs_do_unlink(dir, dentry, dentry->d_inode);
 529 }
 530
 531 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 532                             const char *symname)
 533 {
 534         int rc;
 535         struct dentry *lower_dentry;
 536         struct dentry *lower_dir_dentry;
 537         char *encoded_symname;
 538         size_t encoded_symlen;
 539         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 540
 541         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 542         dget(lower_dentry);
 543         lower_dir_dentry = lock_parent(lower_dentry);
 544         mount_crypt_stat = &ecryptfs_superblock_to_private(
 545                 dir->i_sb)->mount_crypt_stat;
 546         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 547                                                   &encoded_symlen,
 548                                                   NULL,
 549                                                   mount_crypt_stat, symname,
 550                                                   strlen(symname));
 551         if (rc)
 552                 goto out_lock;
 553         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 554                          encoded_symname);
 555         kfree(encoded_symname);
 556         if (rc || !lower_dentry->d_inode)
 557                 goto out_lock;
 558         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 559         if (rc)
 560                 goto out_lock;
 561         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 562         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 563 out_lock:
 564         unlock_dir(lower_dir_dentry);
 565         dput(lower_dentry);
 566         if (!dentry->d_inode)
 567                 d_drop(dentry);
 568         return rc;
 569 }
 570
 571 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 572 {
 573         int rc;
 574         struct dentry *lower_dentry;
 575         struct dentry *lower_dir_dentry;
 576
 577         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 578         lower_dir_dentry = lock_parent(lower_dentry);
 579         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 580         if (rc || !lower_dentry->d_inode)
 581                 goto out;
 582         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 583         if (rc)
 584                 goto out;
 585         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 586         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 587         set_nlink(dir, lower_dir_dentry->d_inode->i_nlink);
 588 out:
 589         unlock_dir(lower_dir_dentry);
 590         if (!dentry->d_inode)
 591                 d_drop(dentry);
 592         return rc;
 593 }
 594
 595 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 596 {
 597         struct dentry *lower_dentry;
 598         struct dentry *lower_dir_dentry;
 599         int rc;
 600
 601         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 602         dget(dentry);
 603         lower_dir_dentry = lock_parent(lower_dentry);
 604         dget(lower_dentry);
 605         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 606         dput(lower_dentry);
 607         if (!rc && dentry->d_inode)
 608                 clear_nlink(dentry->d_inode);
 609         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 610         set_nlink(dir, lower_dir_dentry->d_inode->i_nlink);
 611         unlock_dir(lower_dir_dentry);
 612         if (!rc)
 613                 d_drop(dentry);
 614         dput(dentry);
 615         return rc;
 616 }
 617
 618 static int
 619 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 620 {
 621         int rc;
 622         struct dentry *lower_dentry;
 623         struct dentry *lower_dir_dentry;
 624
 625         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 626         lower_dir_dentry = lock_parent(lower_dentry);
 627         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 628         if (rc || !lower_dentry->d_inode)
 629                 goto out;
 630         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 631         if (rc)
 632                 goto out;
 633         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 634         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 635 out:
 636         unlock_dir(lower_dir_dentry);
 637         if (!dentry->d_inode)
 638                 d_drop(dentry);
 639         return rc;
 640 }
 641
 642 static int
 643 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 644                 struct inode *new_dir, struct dentry *new_dentry)
 645 {
 646         int rc;
 647         struct dentry *lower_old_dentry;
 648         struct dentry *lower_new_dentry;
 649         struct dentry *lower_old_dir_dentry;
 650         struct dentry *lower_new_dir_dentry;
 651         struct dentry *trap = NULL;
 652         struct inode *target_inode;
 653
 654         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 655         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 656         dget(lower_old_dentry);
 657         dget(lower_new_dentry);
 658         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 659         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 660         target_inode = new_dentry->d_inode;
 661         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 662         /* source should not be ancestor of target */
 663         if (trap == lower_old_dentry) {
 664                 rc = -EINVAL;
 665                 goto out_lock;
 666         }
 667         /* target should not be ancestor of source */
 668         if (trap == lower_new_dentry) {
 669                 rc = -ENOTEMPTY;
 670                 goto out_lock;
 671         }
 672         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 673                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 674         if (rc)
 675                 goto out_lock;
 676         if (target_inode)
 677                 fsstack_copy_attr_all(target_inode,
 678                                       ecryptfs_inode_to_lower(target_inode));
 679         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 680         if (new_dir != old_dir)
 681                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 682 out_lock:
 683         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 684         dput(lower_new_dir_dentry);
 685         dput(lower_old_dir_dentry);
 686         dput(lower_new_dentry);
 687         dput(lower_old_dentry);
 688         return rc;
 689 }
 690
 691 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 692                                    size_t *bufsiz)
 693 {
 694         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 695         char *lower_buf;
 696         size_t lower_bufsiz = PATH_MAX;
 697         mm_segment_t old_fs;
 698         int rc;
 699
 700         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 701         if (!lower_buf) {
 702                 rc = -ENOMEM;
 703                 goto out;
 704         }
 705         old_fs = get_fs();
 706         set_fs(get_ds());
 707         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 708                                                    (char __user *)lower_buf,
 709                                                    lower_bufsiz);
 710         set_fs(old_fs);
 711         if (rc < 0)
 712                 goto out;
 713         lower_bufsiz = rc;
 714         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 715                                                   lower_buf, lower_bufsiz);
 716 out:
 717         kfree(lower_buf);
 718         return rc;
 719 }
 720
 721 static int
 722 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 723 {
 724         char *kbuf;
 725         size_t kbufsiz, copied;
 726         int rc;
 727
 728         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 729         if (rc)
 730                 goto out;
 731         copied = min_t(size_t, bufsiz, kbufsiz);
 732         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 733         kfree(kbuf);
 734         fsstack_copy_attr_atime(dentry->d_inode,
 735                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 736 out:
 737         return rc;
 738 }
 739
 740 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 741 {
 742         char *buf;
 743         int len = PAGE_SIZE, rc;
 744         mm_segment_t old_fs;
 745
 746         /* Released in ecryptfs_put_link(); only release here on error */
 747         buf = kmalloc(len, GFP_KERNEL);
 748         if (!buf) {
 749                 buf = ERR_PTR(-ENOMEM);
 750                 goto out;
 751         }
 752         old_fs = get_fs();
 753         set_fs(get_ds());
 754         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 755         set_fs(old_fs);
 756         if (rc < 0) {
 757                 kfree(buf);
 758                 buf = ERR_PTR(rc);
 759         } else
 760                 buf[rc] = '\0';
 761 out:
 762         nd_set_link(nd, buf);
 763         return NULL;
 764 }
 765
 766 static void
 767 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 768 {
 769         char *buf = nd_get_link(nd);
 770         if (!IS_ERR(buf)) {
 771                 /* Free the char* */
 772                 kfree(buf);
 773         }
 774 }
 775
 776 /**
 777  * upper_size_to_lower_size
 778  * @crypt_stat: Crypt_stat associated with file
 779  * @upper_size: Size of the upper file
 780  *
 781  * Calculate the required size of the lower file based on the
 782  * specified size of the upper file. This calculation is based on the
 783  * number of headers in the underlying file and the extent size.
 784  *
 785  * Returns Calculated size of the lower file.
 786  */
 787 static loff_t
 788 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 789                          loff_t upper_size)
 790 {
 791         loff_t lower_size;
 792
 793         lower_size = ecryptfs_lower_header_size(crypt_stat);
 794         if (upper_size != 0) {
 795                 loff_t num_extents;
 796
 797                 num_extents = upper_size >> crypt_stat->extent_shift;
 798                 if (upper_size & ~crypt_stat->extent_mask)
 799                         num_extents++;
 800                 lower_size += (num_extents * crypt_stat->extent_size);
 801         }
 802         return lower_size;
 803 }
 804
 805 /**
 806  * truncate_upper
 807  * @dentry: The ecryptfs layer dentry
 808  * @ia: Address of the ecryptfs inode's attributes
 809  * @lower_ia: Address of the lower inode's attributes
 810  *
 811  * Function to handle truncations modifying the size of the file. Note
 812  * that the file sizes are interpolated. When expanding, we are simply
 813  * writing strings of 0's out. When truncating, we truncate the upper
 814  * inode and update the lower_ia according to the page index
 815  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 816  * the caller must use lower_ia in a call to notify_change() to perform
 817  * the truncation of the lower inode.
 818  *
 819  * Returns zero on success; non-zero otherwise
 820  */
 821 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 822                           struct iattr *lower_ia)
 823 {
 824         int rc = 0;
 825         struct inode *inode = dentry->d_inode;
 826         struct ecryptfs_crypt_stat *crypt_stat;
 827         loff_t i_size = i_size_read(inode);
 828         loff_t lower_size_before_truncate;
 829         loff_t lower_size_after_truncate;
 830
 831         if (unlikely((ia->ia_size == i_size))) {
 832                 lower_ia->ia_valid &= ~ATTR_SIZE;
 833                 return 0;
 834         }
 835         rc = ecryptfs_get_lower_file(dentry, inode);
 836         if (rc)
 837                 return rc;
 838         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 839         /* Switch on growing or shrinking file */
 840         if (ia->ia_size > i_size) {
 841                 char zero[] = { 0x00 };
 842
 843                 lower_ia->ia_valid &= ~ATTR_SIZE;
 844                 /* Write a single 0 at the last position of the file;
 845                  * this triggers code that will fill in 0's throughout
 846                  * the intermediate portion of the previous end of the
 847                  * file and the new and of the file */
 848                 rc = ecryptfs_write(inode, zero,
 849                                     (ia->ia_size - 1), 1);
 850         } else { /* ia->ia_size < i_size_read(inode) */
 851                 /* We're chopping off all the pages down to the page
 852                  * in which ia->ia_size is located. Fill in the end of
 853                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 854                  * PAGE_CACHE_SIZE with zeros. */
 855                 size_t num_zeros = (PAGE_CACHE_SIZE
 856                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 857
 858                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 859                         truncate_setsize(inode, ia->ia_size);
 860                         lower_ia->ia_size = ia->ia_size;
 861                         lower_ia->ia_valid |= ATTR_SIZE;
 862                         goto out;
 863                 }
 864                 if (num_zeros) {
 865                         char *zeros_virt;
 866
 867                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 868                         if (!zeros_virt) {
 869                                 rc = -ENOMEM;
 870                                 goto out;
 871                         }
 872                         rc = ecryptfs_write(inode, zeros_virt,
 873                                             ia->ia_size, num_zeros);
 874                         kfree(zeros_virt);
 875                         if (rc) {
 876                                 printk(KERN_ERR "Error attempting to zero out "
 877                                        "the remainder of the end page on "
 878                                        "reducing truncate; rc = [%d]\n", rc);
 879                                 goto out;
 880                         }
 881                 }
 882                 truncate_setsize(inode, ia->ia_size);
 883                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 884                 if (rc) {
 885                         printk(KERN_ERR "Problem with "
 886                                "ecryptfs_write_inode_size_to_metadata; "
 887                                "rc = [%d]\n", rc);
 888                         goto out;
 889                 }
 890                 /* We are reducing the size of the ecryptfs file, and need to
 891                  * know if we need to reduce the size of the lower file. */
 892                 lower_size_before_truncate =
 893                     upper_size_to_lower_size(crypt_stat, i_size);
 894                 lower_size_after_truncate =
 895                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 896                 if (lower_size_after_truncate < lower_size_before_truncate) {
 897                         lower_ia->ia_size = lower_size_after_truncate;
 898                         lower_ia->ia_valid |= ATTR_SIZE;
 899                 } else
 900                         lower_ia->ia_valid &= ~ATTR_SIZE;
 901         }
 902 out:
 903         ecryptfs_put_lower_file(inode);
 904         return rc;
 905 }
 906
 907 static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
 908 {
 909         struct ecryptfs_crypt_stat *crypt_stat;
 910         loff_t lower_oldsize, lower_newsize;
 911
 912         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 913         lower_oldsize = upper_size_to_lower_size(crypt_stat,
 914                                                  i_size_read(inode));
 915         lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
 916         if (lower_newsize > lower_oldsize) {
 917                 /*
 918                  * The eCryptfs inode and the new *lower* size are mixed here
 919                  * because we may not have the lower i_mutex held and/or it may
 920                  * not be appropriate to call inode_newsize_ok() with inodes
 921                  * from other filesystems.
 922                  */
 923                 return inode_newsize_ok(inode, lower_newsize);
 924         }
 925
 926         return 0;
 927 }
 928
 929 /**
 930  * ecryptfs_truncate
 931  * @dentry: The ecryptfs layer dentry
 932  * @new_length: The length to expand the file to
 933  *
 934  * Simple function that handles the truncation of an eCryptfs inode and
 935  * its corresponding lower inode.
 936  *
 937  * Returns zero on success; non-zero otherwise
 938  */
 939 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 940 {
 941         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 942         struct iattr lower_ia = { .ia_valid = 0 };
 943         int rc;
 944
 945         rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length);
 946         if (rc)
 947                 return rc;
 948
 949         rc = truncate_upper(dentry, &ia, &lower_ia);
 950         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 951                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 952
 953                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 954                 rc = notify_change(lower_dentry, &lower_ia);
 955                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 956         }
 957         return rc;
 958 }
 959
 960 static int
 961 ecryptfs_permission(struct inode *inode, int mask)
 962 {
 963         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 964 }
 965
 966 /**
 967  * ecryptfs_setattr
 968  * @dentry: dentry handle to the inode to modify
 969  * @ia: Structure with flags of what to change and values
 970  *
 971  * Updates the metadata of an inode. If the update is to the size
 972  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 973  * of both the ecryptfs inode and the lower inode.
 974  *
 975  * All other metadata changes will be passed right to the lower filesystem,
 976  * and we will just update our inode to look like the lower.
 977  */
 978 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 979 {
 980         int rc = 0;
 981         struct dentry *lower_dentry;
 982         struct iattr lower_ia;
 983         struct inode *inode;
 984         struct inode *lower_inode;
 985         struct ecryptfs_crypt_stat *crypt_stat;
 986
 987         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 988         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 989                 ecryptfs_init_crypt_stat(crypt_stat);
 990         inode = dentry->d_inode;
 991         lower_inode = ecryptfs_inode_to_lower(inode);
 992         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 993         mutex_lock(&crypt_stat->cs_mutex);
 994         if (S_ISDIR(dentry->d_inode->i_mode))
 995                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 996         else if (S_ISREG(dentry->d_inode->i_mode)
 997                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 998                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 999                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1000
1001                 mount_crypt_stat = &ecryptfs_superblock_to_private(
1002                         dentry->d_sb)->mount_crypt_stat;
1003                 rc = ecryptfs_get_lower_file(dentry, inode);
1004                 if (rc) {
1005                         mutex_unlock(&crypt_stat->cs_mutex);
1006                         goto out;
1007                 }
1008                 rc = ecryptfs_read_metadata(dentry);
1009                 ecryptfs_put_lower_file(inode);
1010                 if (rc) {
1011                         if (!(mount_crypt_stat->flags
1012                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
1013                                 rc = -EIO;
1014                                 printk(KERN_WARNING "Either the lower file "
1015                                        "is not in a valid eCryptfs format, "
1016                                        "or the key could not be retrieved. "
1017                                        "Plaintext passthrough mode is not "
1018                                        "enabled; returning -EIO\n");
1019                                 mutex_unlock(&crypt_stat->cs_mutex);
1020                                 goto out;
1021                         }
1022                         rc = 0;
1023                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
1024                                                | ECRYPTFS_ENCRYPTED);
1025                 }
1026         }
1027         mutex_unlock(&crypt_stat->cs_mutex);
1028
1029         rc = inode_change_ok(inode, ia);
1030         if (rc)
1031                 goto out;
1032         if (ia->ia_valid & ATTR_SIZE) {
1033                 rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
1034                 if (rc)
1035                         goto out;
1036         }
1037
1038         if (S_ISREG(inode->i_mode)) {
1039                 rc = filemap_write_and_wait(inode->i_mapping);
1040                 if (rc)
1041                         goto out;
1042                 fsstack_copy_attr_all(inode, lower_inode);
1043         }
1044         memcpy(&lower_ia, ia, sizeof(lower_ia));
1045         if (ia->ia_valid & ATTR_FILE)
1046                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1047         if (ia->ia_valid & ATTR_SIZE) {
1048                 rc = truncate_upper(dentry, ia, &lower_ia);
1049                 if (rc < 0)
1050                         goto out;
1051         }
1052
1053         /*
1054          * mode change is for clearing setuid/setgid bits. Allow lower fs
1055          * to interpret this in its own way.
1056          */
1057         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1058                 lower_ia.ia_valid &= ~ATTR_MODE;
1059
1060         mutex_lock(&lower_dentry->d_inode->i_mutex);
1061         rc = notify_change(lower_dentry, &lower_ia);
1062         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1063 out:
1064         fsstack_copy_attr_all(inode, lower_inode);
1065         return rc;
1066 }
1067
1068 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1069                           struct kstat *stat)
1070 {
1071         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1072         int rc = 0;
1073
1074         mount_crypt_stat = &ecryptfs_superblock_to_private(
1075                                                 dentry->d_sb)->mount_crypt_stat;
1076         generic_fillattr(dentry->d_inode, stat);
1077         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1078                 char *target;
1079                 size_t targetsiz;
1080
1081                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1082                 if (!rc) {
1083                         kfree(target);
1084                         stat->size = targetsiz;
1085                 }
1086         }
1087         return rc;
1088 }
1089
1090 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1091                      struct kstat *stat)
1092 {
1093         struct kstat lower_stat;
1094         int rc;
1095
1096         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1097                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1098         if (!rc) {
1099                 fsstack_copy_attr_all(dentry->d_inode,
1100                                       ecryptfs_inode_to_lower(dentry->d_inode));
1101                 generic_fillattr(dentry->d_inode, stat);
1102                 stat->blocks = lower_stat.blocks;
1103         }
1104         return rc;
1105 }
1106
1107 int
1108 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1109                   size_t size, int flags)
1110 {
1111         int rc = 0;
1112         struct dentry *lower_dentry;
1113
1114         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1115         if (!lower_dentry->d_inode->i_op->setxattr) {
1116                 rc = -EOPNOTSUPP;
1117                 goto out;
1118         }
1119
1120         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1121         if (!rc)
1122                 fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode);
1123 out:
1124         return rc;
1125 }
1126
1127 ssize_t
1128 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1129                         void *value, size_t size)
1130 {
1131         int rc = 0;
1132
1133         if (!lower_dentry->d_inode->i_op->getxattr) {
1134                 rc = -EOPNOTSUPP;
1135                 goto out;
1136         }
1137         mutex_lock(&lower_dentry->d_inode->i_mutex);
1138         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1139                                                    size);
1140         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1141 out:
1142         return rc;
1143 }
1144
1145 static ssize_t
1146 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1147                   size_t size)
1148 {
1149         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1150                                        value, size);
1151 }
1152
1153 static ssize_t
1154 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
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->listxattr) {
1161                 rc = -EOPNOTSUPP;
1162                 goto out;
1163         }
1164         mutex_lock(&lower_dentry->d_inode->i_mutex);
1165         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1166         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1167 out:
1168         return rc;
1169 }
1170
1171 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1172 {
1173         int rc = 0;
1174         struct dentry *lower_dentry;
1175
1176         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1177         if (!lower_dentry->d_inode->i_op->removexattr) {
1178                 rc = -EOPNOTSUPP;
1179                 goto out;
1180         }
1181         mutex_lock(&lower_dentry->d_inode->i_mutex);
1182         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1183         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1184 out:
1185         return rc;
1186 }
1187
1188 const struct inode_operations ecryptfs_symlink_iops = {
1189         .readlink = ecryptfs_readlink,
1190         .follow_link = ecryptfs_follow_link,
1191         .put_link = ecryptfs_put_link,
1192         .permission = ecryptfs_permission,
1193         .setattr = ecryptfs_setattr,
1194         .getattr = ecryptfs_getattr_link,
1195         .setxattr = ecryptfs_setxattr,
1196         .getxattr = ecryptfs_getxattr,
1197         .listxattr = ecryptfs_listxattr,
1198         .removexattr = ecryptfs_removexattr
1199 };
1200
1201 const struct inode_operations ecryptfs_dir_iops = {
1202         .create = ecryptfs_create,
1203         .lookup = ecryptfs_lookup,
1204         .link = ecryptfs_link,
1205         .unlink = ecryptfs_unlink,
1206         .symlink = ecryptfs_symlink,
1207         .mkdir = ecryptfs_mkdir,
1208         .rmdir = ecryptfs_rmdir,
1209         .mknod = ecryptfs_mknod,
1210         .rename = ecryptfs_rename,
1211         .permission = ecryptfs_permission,
1212         .setattr = ecryptfs_setattr,
1213         .setxattr = ecryptfs_setxattr,
1214         .getxattr = ecryptfs_getxattr,
1215         .listxattr = ecryptfs_listxattr,
1216         .removexattr = ecryptfs_removexattr
1217 };
1218
1219 const struct inode_operations ecryptfs_main_iops = {
1220         .permission = ecryptfs_permission,
1221         .setattr = ecryptfs_setattr,
1222         .getattr = ecryptfs_getattr,
1223         .setxattr = ecryptfs_setxattr,
1224         .getxattr = ecryptfs_getxattr,
1225         .listxattr = ecryptfs_listxattr,
1226         .removexattr = ecryptfs_removexattr
1227 };