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