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