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   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 <asm/unaligned.h>
  35 #include "ecryptfs_kernel.h"
  36
  37 static struct dentry *lock_parent(struct dentry *dentry)
  38 {
  39         struct dentry *dir;
  40
  41         dir = dget_parent(dentry);
  42         mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
  43         return dir;
  44 }
  45
  46 static void unlock_dir(struct dentry *dir)
  47 {
  48         mutex_unlock(&dir->d_inode->i_mutex);
  49         dput(dir);
  50 }
  51
  52 /**
  53  * ecryptfs_create_underlying_file
  54  * @lower_dir_inode: inode of the parent in the lower fs of the new file
  55  * @dentry: New file's dentry
  56  * @mode: The mode of the new file
  57  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
  58  *
  59  * Creates the file in the lower file system.
  60  *
  61  * Returns zero on success; non-zero on error condition
  62  */
  63 static int
  64 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
  65                                 struct dentry *dentry, int mode,
  66                                 struct nameidata *nd)
  67 {
  68         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
  69         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
  70         struct dentry *dentry_save;
  71         struct vfsmount *vfsmount_save;
  72         int rc;
  73
  74         dentry_save = nd->path.dentry;
  75         vfsmount_save = nd->path.mnt;
  76         nd->path.dentry = lower_dentry;
  77         nd->path.mnt = lower_mnt;
  78         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
  79         nd->path.dentry = dentry_save;
  80         nd->path.mnt = vfsmount_save;
  81         return rc;
  82 }
  83
  84 /**
  85  * ecryptfs_do_create
  86  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
  87  * @ecryptfs_dentry: New file's dentry in ecryptfs
  88  * @mode: The mode of the new file
  89  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
  90  *
  91  * Creates the underlying file and the eCryptfs inode which will link to
  92  * it. It will also update the eCryptfs directory inode to mimic the
  93  * stat of the lower directory inode.
  94  *
  95  * Returns zero on success; non-zero on error condition
  96  */
  97 static int
  98 ecryptfs_do_create(struct inode *directory_inode,
  99                    struct dentry *ecryptfs_dentry, int mode,
 100                    struct nameidata *nd)
 101 {
 102         int rc;
 103         struct dentry *lower_dentry;
 104         struct dentry *lower_dir_dentry;
 105
 106         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 107         lower_dir_dentry = lock_parent(lower_dentry);
 108         if (IS_ERR(lower_dir_dentry)) {
 109                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 110                                 "dentry\n");
 111                 rc = PTR_ERR(lower_dir_dentry);
 112                 goto out;
 113         }
 114         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 115                                              ecryptfs_dentry, mode, nd);
 116         if (rc) {
 117                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 118                        "rc = [%d]\n", __func__, rc);
 119                 goto out_lock;
 120         }
 121         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 122                                 directory_inode->i_sb, 0);
 123         if (rc) {
 124                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 125                 goto out_lock;
 126         }
 127         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 128         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 129 out_lock:
 130         unlock_dir(lower_dir_dentry);
 131 out:
 132         return rc;
 133 }
 134
 135 /**
 136  * grow_file
 137  * @ecryptfs_dentry: the eCryptfs dentry
 138  *
 139  * This is the code which will grow the file to its correct size.
 140  */
 141 static int grow_file(struct dentry *ecryptfs_dentry)
 142 {
 143         struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
 144         struct file fake_file;
 145         struct ecryptfs_file_info tmp_file_info;
 146         char zero_virt[] = { 0x00 };
 147         int rc = 0;
 148
 149         memset(&fake_file, 0, sizeof(fake_file));
 150         fake_file.f_path.dentry = ecryptfs_dentry;
 151         memset(&tmp_file_info, 0, sizeof(tmp_file_info));
 152         ecryptfs_set_file_private(&fake_file, &tmp_file_info);
 153         ecryptfs_set_file_lower(
 154                 &fake_file,
 155                 ecryptfs_inode_to_private(ecryptfs_inode)->lower_file);
 156         rc = ecryptfs_write(&fake_file, zero_virt, 0, 1);
 157         i_size_write(ecryptfs_inode, 0);
 158         rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
 159         ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
 160                 ECRYPTFS_NEW_FILE;
 161         return rc;
 162 }
 163
 164 /**
 165  * ecryptfs_initialize_file
 166  *
 167  * Cause the file to be changed from a basic empty file to an ecryptfs
 168  * file with a header and first data page.
 169  *
 170  * Returns zero on success
 171  */
 172 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 173 {
 174         struct ecryptfs_crypt_stat *crypt_stat =
 175                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 176         int rc = 0;
 177
 178         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 179                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 180                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 181                 goto out;
 182         }
 183         crypt_stat->flags |= ECRYPTFS_NEW_FILE;
 184         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 185         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 186         if (rc) {
 187                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 188                                 "context; rc = [%d]\n", rc);
 189                 goto out;
 190         }
 191         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
 192                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 193                 if (rc) {
 194                         printk(KERN_ERR "%s: Error attempting to initialize "
 195                                "the persistent file for the dentry with name "
 196                                "[%s]; rc = [%d]\n", __func__,
 197                                ecryptfs_dentry->d_name.name, rc);
 198                         goto out;
 199                 }
 200         }
 201         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 202         if (rc) {
 203                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 204                 goto out;
 205         }
 206         rc = grow_file(ecryptfs_dentry);
 207         if (rc)
 208                 printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
 209 out:
 210         return rc;
 211 }
 212
 213 /**
 214  * ecryptfs_create
 215  * @dir: The inode of the directory in which to create the file.
 216  * @dentry: The eCryptfs dentry
 217  * @mode: The mode of the new file.
 218  * @nd: nameidata
 219  *
 220  * Creates a new file.
 221  *
 222  * Returns zero on success; non-zero on error condition
 223  */
 224 static int
 225 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 226                 int mode, struct nameidata *nd)
 227 {
 228         int rc;
 229
 230         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 231         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 232         if (unlikely(rc)) {
 233                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 234                                 "lower filesystem\n");
 235                 goto out;
 236         }
 237         /* At this point, a file exists on "disk"; we need to make sure
 238          * that this on disk file is prepared to be an ecryptfs file */
 239         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 240 out:
 241         return rc;
 242 }
 243
 244 /**
 245  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
 246  */
 247 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 248                                         struct dentry *lower_dentry,
 249                                         struct inode *ecryptfs_dir_inode,
 250                                         struct nameidata *ecryptfs_nd)
 251 {
 252         struct dentry *lower_dir_dentry;
 253         struct vfsmount *lower_mnt;
 254         struct inode *lower_inode;
 255         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 256         struct ecryptfs_crypt_stat *crypt_stat;
 257         char *page_virt = NULL;
 258         u64 file_size;
 259         int rc = 0;
 260
 261         lower_dir_dentry = lower_dentry->d_parent;
 262         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 263                                    ecryptfs_dentry->d_parent));
 264         lower_inode = lower_dentry->d_inode;
 265         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
 266         BUG_ON(!atomic_read(&lower_dentry->d_count));
 267         ecryptfs_set_dentry_private(ecryptfs_dentry,
 268                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
 269                                                      GFP_KERNEL));
 270         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
 271                 rc = -ENOMEM;
 272                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 273                        "to allocate ecryptfs_dentry_info struct\n",
 274                         __func__);
 275                 goto out_dput;
 276         }
 277         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 278         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
 279         if (!lower_dentry->d_inode) {
 280                 /* We want to add because we couldn't find in lower */
 281                 d_add(ecryptfs_dentry, NULL);
 282                 goto out;
 283         }
 284         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 285                                 ecryptfs_dir_inode->i_sb, 1);
 286         if (rc) {
 287                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
 288                        __func__, rc);
 289                 goto out;
 290         }
 291         if (S_ISDIR(lower_inode->i_mode))
 292                 goto out;
 293         if (S_ISLNK(lower_inode->i_mode))
 294                 goto out;
 295         if (special_file(lower_inode->i_mode))
 296                 goto out;
 297         if (!ecryptfs_nd)
 298                 goto out;
 299         /* Released in this function */
 300         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
 301         if (!page_virt) {
 302                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
 303                        __func__);
 304                 rc = -ENOMEM;
 305                 goto out;
 306         }
 307         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
 308                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 309                 if (rc) {
 310                         printk(KERN_ERR "%s: Error attempting to initialize "
 311                                "the persistent file for the dentry with name "
 312                                "[%s]; rc = [%d]\n", __func__,
 313                                ecryptfs_dentry->d_name.name, rc);
 314                         goto out_free_kmem;
 315                 }
 316         }
 317         crypt_stat = &ecryptfs_inode_to_private(
 318                                         ecryptfs_dentry->d_inode)->crypt_stat;
 319         /* TODO: lock for crypt_stat comparison */
 320         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 321                         ecryptfs_set_default_sizes(crypt_stat);
 322         rc = ecryptfs_read_and_validate_header_region(page_virt,
 323                                                       ecryptfs_dentry->d_inode);
 324         if (rc) {
 325                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 326                                                              ecryptfs_dentry);
 327                 if (rc) {
 328                         rc = 0;
 329                         goto out_free_kmem;
 330                 }
 331                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 332         }
 333         mount_crypt_stat = &ecryptfs_superblock_to_private(
 334                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 335         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
 336                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 337                         file_size = (crypt_stat->num_header_bytes_at_front
 338                                      + i_size_read(lower_dentry->d_inode));
 339                 else
 340                         file_size = i_size_read(lower_dentry->d_inode);
 341         } else {
 342                 file_size = get_unaligned_be64(page_virt);
 343         }
 344         i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
 345 out_free_kmem:
 346         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 347         goto out;
 348 out_dput:
 349         dput(lower_dentry);
 350         d_drop(ecryptfs_dentry);
 351 out:
 352         return rc;
 353 }
 354
 355 /**
 356  * ecryptfs_lookup
 357  * @ecryptfs_dir_inode: The eCryptfs directory inode
 358  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 359  * @ecryptfs_nd: nameidata; may be NULL
 360  *
 361  * Find a file on disk. If the file does not exist, then we'll add it to the
 362  * dentry cache and continue on to read it from the disk.
 363  */
 364 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 365                                       struct dentry *ecryptfs_dentry,
 366                                       struct nameidata *ecryptfs_nd)
 367 {
 368         char *encrypted_and_encoded_name = NULL;
 369         size_t encrypted_and_encoded_name_size;
 370         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 371         struct dentry *lower_dir_dentry, *lower_dentry;
 372         int rc = 0;
 373
 374         ecryptfs_dentry->d_op = &ecryptfs_dops;
 375         if ((ecryptfs_dentry->d_name.len == 1
 376              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 377             || (ecryptfs_dentry->d_name.len == 2
 378                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 379                 goto out_d_drop;
 380         }
 381         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 382         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 383         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
 384                                       lower_dir_dentry,
 385                                       ecryptfs_dentry->d_name.len);
 386         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 387         if (IS_ERR(lower_dentry)) {
 388                 rc = PTR_ERR(lower_dentry);
 389                 printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
 390                        "lower_dentry = [%s]\n", __func__, rc,
 391                        ecryptfs_dentry->d_name.name);
 392                 goto out_d_drop;
 393         }
 394         if (lower_dentry->d_inode)
 395                 goto lookup_and_interpose;
 396         mount_crypt_stat = &ecryptfs_superblock_to_private(
 397                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 398         if (!(mount_crypt_stat
 399             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 400                 goto lookup_and_interpose;
 401         dput(lower_dentry);
 402         rc = ecryptfs_encrypt_and_encode_filename(
 403                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 404                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 405                 ecryptfs_dentry->d_name.len);
 406         if (rc) {
 407                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 408                        "filename; rc = [%d]\n", __func__, rc);
 409                 goto out_d_drop;
 410         }
 411         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
 412         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
 413                                       lower_dir_dentry,
 414                                       encrypted_and_encoded_name_size - 1);
 415         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
 416         if (IS_ERR(lower_dentry)) {
 417                 rc = PTR_ERR(lower_dentry);
 418                 printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
 419                        "lower_dentry = [%s]\n", __func__, rc,
 420                        encrypted_and_encoded_name);
 421                 goto out_d_drop;
 422         }
 423 lookup_and_interpose:
 424         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
 425                                                  ecryptfs_dir_inode,
 426                                                  ecryptfs_nd);
 427         goto out;
 428 out_d_drop:
 429         d_drop(ecryptfs_dentry);
 430 out:
 431         kfree(encrypted_and_encoded_name);
 432         return ERR_PTR(rc);
 433 }
 434
 435 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 436                          struct dentry *new_dentry)
 437 {
 438         struct dentry *lower_old_dentry;
 439         struct dentry *lower_new_dentry;
 440         struct dentry *lower_dir_dentry;
 441         u64 file_size_save;
 442         int rc;
 443
 444         file_size_save = i_size_read(old_dentry->d_inode);
 445         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 446         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 447         dget(lower_old_dentry);
 448         dget(lower_new_dentry);
 449         lower_dir_dentry = lock_parent(lower_new_dentry);
 450         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 451                       lower_new_dentry);
 452         if (rc || !lower_new_dentry->d_inode)
 453                 goto out_lock;
 454         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
 455         if (rc)
 456                 goto out_lock;
 457         fsstack_copy_attr_times(dir, lower_new_dentry->d_inode);
 458         fsstack_copy_inode_size(dir, lower_new_dentry->d_inode);
 459         old_dentry->d_inode->i_nlink =
 460                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 461         i_size_write(new_dentry->d_inode, file_size_save);
 462 out_lock:
 463         unlock_dir(lower_dir_dentry);
 464         dput(lower_new_dentry);
 465         dput(lower_old_dentry);
 466         d_drop(lower_old_dentry);
 467         d_drop(new_dentry);
 468         d_drop(old_dentry);
 469         return rc;
 470 }
 471
 472 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 473 {
 474         int rc = 0;
 475         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 476         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 477         struct dentry *lower_dir_dentry;
 478
 479         dget(lower_dentry);
 480         lower_dir_dentry = lock_parent(lower_dentry);
 481         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 482         if (rc) {
 483                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 484                 goto out_unlock;
 485         }
 486         fsstack_copy_attr_times(dir, lower_dir_inode);
 487         dentry->d_inode->i_nlink =
 488                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 489         dentry->d_inode->i_ctime = dir->i_ctime;
 490         d_drop(dentry);
 491 out_unlock:
 492         unlock_dir(lower_dir_dentry);
 493         dput(lower_dentry);
 494         return rc;
 495 }
 496
 497 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 498                             const char *symname)
 499 {
 500         int rc;
 501         struct dentry *lower_dentry;
 502         struct dentry *lower_dir_dentry;
 503         char *encoded_symname;
 504         size_t encoded_symlen;
 505         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 506
 507         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 508         dget(lower_dentry);
 509         lower_dir_dentry = lock_parent(lower_dentry);
 510         mount_crypt_stat = &ecryptfs_superblock_to_private(
 511                 dir->i_sb)->mount_crypt_stat;
 512         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 513                                                   &encoded_symlen,
 514                                                   NULL,
 515                                                   mount_crypt_stat, symname,
 516                                                   strlen(symname));
 517         if (rc)
 518                 goto out_lock;
 519         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 520                          encoded_symname);
 521         kfree(encoded_symname);
 522         if (rc || !lower_dentry->d_inode)
 523                 goto out_lock;
 524         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 525         if (rc)
 526                 goto out_lock;
 527         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 528         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 529 out_lock:
 530         unlock_dir(lower_dir_dentry);
 531         dput(lower_dentry);
 532         if (!dentry->d_inode)
 533                 d_drop(dentry);
 534         return rc;
 535 }
 536
 537 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 538 {
 539         int rc;
 540         struct dentry *lower_dentry;
 541         struct dentry *lower_dir_dentry;
 542
 543         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 544         lower_dir_dentry = lock_parent(lower_dentry);
 545         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 546         if (rc || !lower_dentry->d_inode)
 547                 goto out;
 548         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 549         if (rc)
 550                 goto out;
 551         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 552         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 553         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 554 out:
 555         unlock_dir(lower_dir_dentry);
 556         if (!dentry->d_inode)
 557                 d_drop(dentry);
 558         return rc;
 559 }
 560
 561 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 562 {
 563         struct dentry *lower_dentry;
 564         struct dentry *lower_dir_dentry;
 565         int rc;
 566
 567         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 568         dget(dentry);
 569         lower_dir_dentry = lock_parent(lower_dentry);
 570         dget(lower_dentry);
 571         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 572         dput(lower_dentry);
 573         if (!rc)
 574                 d_delete(lower_dentry);
 575         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 576         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 577         unlock_dir(lower_dir_dentry);
 578         if (!rc)
 579                 d_drop(dentry);
 580         dput(dentry);
 581         return rc;
 582 }
 583
 584 static int
 585 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 586 {
 587         int rc;
 588         struct dentry *lower_dentry;
 589         struct dentry *lower_dir_dentry;
 590
 591         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 592         lower_dir_dentry = lock_parent(lower_dentry);
 593         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 594         if (rc || !lower_dentry->d_inode)
 595                 goto out;
 596         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 597         if (rc)
 598                 goto out;
 599         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 600         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 601 out:
 602         unlock_dir(lower_dir_dentry);
 603         if (!dentry->d_inode)
 604                 d_drop(dentry);
 605         return rc;
 606 }
 607
 608 static int
 609 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 610                 struct inode *new_dir, struct dentry *new_dentry)
 611 {
 612         int rc;
 613         struct dentry *lower_old_dentry;
 614         struct dentry *lower_new_dentry;
 615         struct dentry *lower_old_dir_dentry;
 616         struct dentry *lower_new_dir_dentry;
 617         struct dentry *trap = NULL;
 618
 619         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 620         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 621         dget(lower_old_dentry);
 622         dget(lower_new_dentry);
 623         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 624         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 625         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 626         /* source should not be ancestor of target */
 627         if (trap == lower_old_dentry) {
 628                 rc = -EINVAL;
 629                 goto out_lock;
 630         }
 631         /* target should not be ancestor of source */
 632         if (trap == lower_new_dentry) {
 633                 rc = -ENOTEMPTY;
 634                 goto out_lock;
 635         }
 636         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 637                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 638         if (rc)
 639                 goto out_lock;
 640         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 641         if (new_dir != old_dir)
 642                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 643 out_lock:
 644         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 645         dput(lower_new_dentry->d_parent);
 646         dput(lower_old_dentry->d_parent);
 647         dput(lower_new_dentry);
 648         dput(lower_old_dentry);
 649         return rc;
 650 }
 651
 652 static int
 653 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 654 {
 655         char *lower_buf;
 656         size_t lower_bufsiz;
 657         struct dentry *lower_dentry;
 658         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 659         char *plaintext_name;
 660         size_t plaintext_name_size;
 661         mm_segment_t old_fs;
 662         int rc;
 663
 664         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 665         if (!lower_dentry->d_inode->i_op->readlink) {
 666                 rc = -EINVAL;
 667                 goto out;
 668         }
 669         mount_crypt_stat = &ecryptfs_superblock_to_private(
 670                                                 dentry->d_sb)->mount_crypt_stat;
 671         /*
 672          * If the lower filename is encrypted, it will result in a significantly
 673          * longer name.  If needed, truncate the name after decode and decrypt.
 674          */
 675         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
 676                 lower_bufsiz = PATH_MAX;
 677         else
 678                 lower_bufsiz = bufsiz;
 679         /* Released in this function */
 680         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 681         if (lower_buf == NULL) {
 682                 printk(KERN_ERR "%s: Out of memory whilst attempting to "
 683                        "kmalloc [%zd] bytes\n", __func__, lower_bufsiz);
 684                 rc = -ENOMEM;
 685                 goto out;
 686         }
 687         old_fs = get_fs();
 688         set_fs(get_ds());
 689         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 690                                                    (char __user *)lower_buf,
 691                                                    lower_bufsiz);
 692         set_fs(old_fs);
 693         if (rc >= 0) {
 694                 rc = ecryptfs_decode_and_decrypt_filename(&plaintext_name,
 695                                                           &plaintext_name_size,
 696                                                           dentry, lower_buf,
 697                                                           rc);
 698                 if (rc) {
 699                         printk(KERN_ERR "%s: Error attempting to decode and "
 700                                "decrypt filename; rc = [%d]\n", __func__,
 701                                 rc);
 702                         goto out_free_lower_buf;
 703                 }
 704                 /* Check for bufsiz <= 0 done in sys_readlinkat() */
 705                 rc = copy_to_user(buf, plaintext_name,
 706                                   min((size_t) bufsiz, plaintext_name_size));
 707                 if (rc)
 708                         rc = -EFAULT;
 709                 else
 710                         rc = plaintext_name_size;
 711                 kfree(plaintext_name);
 712                 fsstack_copy_attr_atime(dentry->d_inode, lower_dentry->d_inode);
 713         }
 714 out_free_lower_buf:
 715         kfree(lower_buf);
 716 out:
 717         return rc;
 718 }
 719
 720 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 721 {
 722         char *buf;
 723         int len = PAGE_SIZE, rc;
 724         mm_segment_t old_fs;
 725
 726         /* Released in ecryptfs_put_link(); only release here on error */
 727         buf = kmalloc(len, GFP_KERNEL);
 728         if (!buf) {
 729                 buf = ERR_PTR(-ENOMEM);
 730                 goto out;
 731         }
 732         old_fs = get_fs();
 733         set_fs(get_ds());
 734         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 735         set_fs(old_fs);
 736         if (rc < 0) {
 737                 kfree(buf);
 738                 buf = ERR_PTR(rc);
 739         } else
 740                 buf[rc] = '\0';
 741 out:
 742         nd_set_link(nd, buf);
 743         return NULL;
 744 }
 745
 746 static void
 747 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 748 {
 749         char *buf = nd_get_link(nd);
 750         if (!IS_ERR(buf)) {
 751                 /* Free the char* */
 752                 kfree(buf);
 753         }
 754 }
 755
 756 /**
 757  * upper_size_to_lower_size
 758  * @crypt_stat: Crypt_stat associated with file
 759  * @upper_size: Size of the upper file
 760  *
 761  * Calculate the required size of the lower file based on the
 762  * specified size of the upper file. This calculation is based on the
 763  * number of headers in the underlying file and the extent size.
 764  *
 765  * Returns Calculated size of the lower file.
 766  */
 767 static loff_t
 768 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 769                          loff_t upper_size)
 770 {
 771         loff_t lower_size;
 772
 773         lower_size = crypt_stat->num_header_bytes_at_front;
 774         if (upper_size != 0) {
 775                 loff_t num_extents;
 776
 777                 num_extents = upper_size >> crypt_stat->extent_shift;
 778                 if (upper_size & ~crypt_stat->extent_mask)
 779                         num_extents++;
 780                 lower_size += (num_extents * crypt_stat->extent_size);
 781         }
 782         return lower_size;
 783 }
 784
 785 /**
 786  * truncate_upper
 787  * @dentry: The ecryptfs layer dentry
 788  * @ia: Address of the ecryptfs inode's attributes
 789  * @lower_ia: Address of the lower inode's attributes
 790  *
 791  * Function to handle truncations modifying the size of the file. Note
 792  * that the file sizes are interpolated. When expanding, we are simply
 793  * writing strings of 0's out. When truncating, we truncate the upper
 794  * inode and update the lower_ia according to the page index
 795  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 796  * the caller must use lower_ia in a call to notify_change() to perform
 797  * the truncation of the lower inode.
 798  *
 799  * Returns zero on success; non-zero otherwise
 800  */
 801 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 802                           struct iattr *lower_ia)
 803 {
 804         int rc = 0;
 805         struct inode *inode = dentry->d_inode;
 806         struct dentry *lower_dentry;
 807         struct file fake_ecryptfs_file;
 808         struct ecryptfs_crypt_stat *crypt_stat;
 809         loff_t i_size = i_size_read(inode);
 810         loff_t lower_size_before_truncate;
 811         loff_t lower_size_after_truncate;
 812
 813         if (unlikely((ia->ia_size == i_size))) {
 814                 lower_ia->ia_valid &= ~ATTR_SIZE;
 815                 goto out;
 816         }
 817         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 818         /* Set up a fake ecryptfs file, this is used to interface with
 819          * the file in the underlying filesystem so that the
 820          * truncation has an effect there as well. */
 821         memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file));
 822         fake_ecryptfs_file.f_path.dentry = dentry;
 823         /* Released at out_free: label */
 824         ecryptfs_set_file_private(&fake_ecryptfs_file,
 825                                   kmem_cache_alloc(ecryptfs_file_info_cache,
 826                                                    GFP_KERNEL));
 827         if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) {
 828                 rc = -ENOMEM;
 829                 goto out;
 830         }
 831         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 832         ecryptfs_set_file_lower(
 833                 &fake_ecryptfs_file,
 834                 ecryptfs_inode_to_private(dentry->d_inode)->lower_file);
 835         /* Switch on growing or shrinking file */
 836         if (ia->ia_size > i_size) {
 837                 char zero[] = { 0x00 };
 838
 839                 lower_ia->ia_valid &= ~ATTR_SIZE;
 840                 /* Write a single 0 at the last position of the file;
 841                  * this triggers code that will fill in 0's throughout
 842                  * the intermediate portion of the previous end of the
 843                  * file and the new and of the file */
 844                 rc = ecryptfs_write(&fake_ecryptfs_file, zero,
 845                                     (ia->ia_size - 1), 1);
 846         } else { /* ia->ia_size < i_size_read(inode) */
 847                 /* We're chopping off all the pages down to the page
 848                  * in which ia->ia_size is located. Fill in the end of
 849                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 850                  * PAGE_CACHE_SIZE with zeros. */
 851                 size_t num_zeros = (PAGE_CACHE_SIZE
 852                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 853
 854                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 855                         rc = vmtruncate(inode, ia->ia_size);
 856                         if (rc)
 857                                 goto out_free;
 858                         lower_ia->ia_size = ia->ia_size;
 859                         lower_ia->ia_valid |= ATTR_SIZE;
 860                         goto out_free;
 861                 }
 862                 if (num_zeros) {
 863                         char *zeros_virt;
 864
 865                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 866                         if (!zeros_virt) {
 867                                 rc = -ENOMEM;
 868                                 goto out_free;
 869                         }
 870                         rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt,
 871                                             ia->ia_size, num_zeros);
 872                         kfree(zeros_virt);
 873                         if (rc) {
 874                                 printk(KERN_ERR "Error attempting to zero out "
 875                                        "the remainder of the end page on "
 876                                        "reducing truncate; rc = [%d]\n", rc);
 877                                 goto out_free;
 878                         }
 879                 }
 880                 vmtruncate(inode, ia->ia_size);
 881                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 882                 if (rc) {
 883                         printk(KERN_ERR "Problem with "
 884                                "ecryptfs_write_inode_size_to_metadata; "
 885                                "rc = [%d]\n", rc);
 886                         goto out_free;
 887                 }
 888                 /* We are reducing the size of the ecryptfs file, and need to
 889                  * know if we need to reduce the size of the lower file. */
 890                 lower_size_before_truncate =
 891                     upper_size_to_lower_size(crypt_stat, i_size);
 892                 lower_size_after_truncate =
 893                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 894                 if (lower_size_after_truncate < lower_size_before_truncate) {
 895                         lower_ia->ia_size = lower_size_after_truncate;
 896                         lower_ia->ia_valid |= ATTR_SIZE;
 897                 } else
 898                         lower_ia->ia_valid &= ~ATTR_SIZE;
 899         }
 900 out_free:
 901         if (ecryptfs_file_to_private(&fake_ecryptfs_file))
 902                 kmem_cache_free(ecryptfs_file_info_cache,
 903                                 ecryptfs_file_to_private(&fake_ecryptfs_file));
 904 out:
 905         return rc;
 906 }
 907
 908 /**
 909  * ecryptfs_truncate
 910  * @dentry: The ecryptfs layer dentry
 911  * @new_length: The length to expand the file to
 912  *
 913  * Simple function that handles the truncation of an eCryptfs inode and
 914  * its corresponding lower inode.
 915  *
 916  * Returns zero on success; non-zero otherwise
 917  */
 918 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 919 {
 920         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 921         struct iattr lower_ia = { .ia_valid = 0 };
 922         int rc;
 923
 924         rc = truncate_upper(dentry, &ia, &lower_ia);
 925         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 926                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 927
 928                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 929                 rc = notify_change(lower_dentry, &lower_ia);
 930                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 931         }
 932         return rc;
 933 }
 934
 935 static int
 936 ecryptfs_permission(struct inode *inode, int mask)
 937 {
 938         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 939 }
 940
 941 /**
 942  * ecryptfs_setattr
 943  * @dentry: dentry handle to the inode to modify
 944  * @ia: Structure with flags of what to change and values
 945  *
 946  * Updates the metadata of an inode. If the update is to the size
 947  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 948  * of both the ecryptfs inode and the lower inode.
 949  *
 950  * All other metadata changes will be passed right to the lower filesystem,
 951  * and we will just update our inode to look like the lower.
 952  */
 953 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 954 {
 955         int rc = 0;
 956         struct dentry *lower_dentry;
 957         struct iattr lower_ia;
 958         struct inode *inode;
 959         struct inode *lower_inode;
 960         struct ecryptfs_crypt_stat *crypt_stat;
 961
 962         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 963         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
 964                 ecryptfs_init_crypt_stat(crypt_stat);
 965         inode = dentry->d_inode;
 966         lower_inode = ecryptfs_inode_to_lower(inode);
 967         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 968         mutex_lock(&crypt_stat->cs_mutex);
 969         if (S_ISDIR(dentry->d_inode->i_mode))
 970                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 971         else if (S_ISREG(dentry->d_inode->i_mode)
 972                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 973                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 974                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 975
 976                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 977                         dentry->d_sb)->mount_crypt_stat;
 978                 rc = ecryptfs_read_metadata(dentry);
 979                 if (rc) {
 980                         if (!(mount_crypt_stat->flags
 981                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 982                                 rc = -EIO;
 983                                 printk(KERN_WARNING "Either the lower file "
 984                                        "is not in a valid eCryptfs format, "
 985                                        "or the key could not be retrieved. "
 986                                        "Plaintext passthrough mode is not "
 987                                        "enabled; returning -EIO\n");
 988                                 mutex_unlock(&crypt_stat->cs_mutex);
 989                                 goto out;
 990                         }
 991                         rc = 0;
 992                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 993                 }
 994         }
 995         mutex_unlock(&crypt_stat->cs_mutex);
 996         memcpy(&lower_ia, ia, sizeof(lower_ia));
 997         if (ia->ia_valid & ATTR_FILE)
 998                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 999         if (ia->ia_valid & ATTR_SIZE) {
1000                 rc = truncate_upper(dentry, ia, &lower_ia);
1001                 if (rc < 0)
1002                         goto out;
1003         }
1004
1005         /*
1006          * mode change is for clearing setuid/setgid bits. Allow lower fs
1007          * to interpret this in its own way.
1008          */
1009         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1010                 lower_ia.ia_valid &= ~ATTR_MODE;
1011
1012         mutex_lock(&lower_dentry->d_inode->i_mutex);
1013         rc = notify_change(lower_dentry, &lower_ia);
1014         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1015 out:
1016         fsstack_copy_attr_all(inode, lower_inode);
1017         return rc;
1018 }
1019
1020 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1021                      struct kstat *stat)
1022 {
1023         struct kstat lower_stat;
1024         int rc;
1025
1026         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1027                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1028         if (!rc) {
1029                 generic_fillattr(dentry->d_inode, stat);
1030                 stat->blocks = lower_stat.blocks;
1031         }
1032         return rc;
1033 }
1034
1035 int
1036 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1037                   size_t size, int flags)
1038 {
1039         int rc = 0;
1040         struct dentry *lower_dentry;
1041
1042         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1043         if (!lower_dentry->d_inode->i_op->setxattr) {
1044                 rc = -ENOSYS;
1045                 goto out;
1046         }
1047         mutex_lock(&lower_dentry->d_inode->i_mutex);
1048         rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
1049                                                    size, flags);
1050         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1051 out:
1052         return rc;
1053 }
1054
1055 ssize_t
1056 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1057                         void *value, size_t size)
1058 {
1059         int rc = 0;
1060
1061         if (!lower_dentry->d_inode->i_op->getxattr) {
1062                 rc = -ENOSYS;
1063                 goto out;
1064         }
1065         mutex_lock(&lower_dentry->d_inode->i_mutex);
1066         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1067                                                    size);
1068         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1069 out:
1070         return rc;
1071 }
1072
1073 static ssize_t
1074 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1075                   size_t size)
1076 {
1077         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1078                                        value, size);
1079 }
1080
1081 static ssize_t
1082 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1083 {
1084         int rc = 0;
1085         struct dentry *lower_dentry;
1086
1087         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1088         if (!lower_dentry->d_inode->i_op->listxattr) {
1089                 rc = -ENOSYS;
1090                 goto out;
1091         }
1092         mutex_lock(&lower_dentry->d_inode->i_mutex);
1093         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1094         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1095 out:
1096         return rc;
1097 }
1098
1099 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1100 {
1101         int rc = 0;
1102         struct dentry *lower_dentry;
1103
1104         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1105         if (!lower_dentry->d_inode->i_op->removexattr) {
1106                 rc = -ENOSYS;
1107                 goto out;
1108         }
1109         mutex_lock(&lower_dentry->d_inode->i_mutex);
1110         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1111         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1112 out:
1113         return rc;
1114 }
1115
1116 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1117 {
1118         if ((ecryptfs_inode_to_lower(inode)
1119              == (struct inode *)candidate_lower_inode))
1120                 return 1;
1121         else
1122                 return 0;
1123 }
1124
1125 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1126 {
1127         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1128         return 0;
1129 }
1130
1131 const struct inode_operations ecryptfs_symlink_iops = {
1132         .readlink = ecryptfs_readlink,
1133         .follow_link = ecryptfs_follow_link,
1134         .put_link = ecryptfs_put_link,
1135         .permission = ecryptfs_permission,
1136         .setattr = ecryptfs_setattr,
1137         .setxattr = ecryptfs_setxattr,
1138         .getxattr = ecryptfs_getxattr,
1139         .listxattr = ecryptfs_listxattr,
1140         .removexattr = ecryptfs_removexattr
1141 };
1142
1143 const struct inode_operations ecryptfs_dir_iops = {
1144         .create = ecryptfs_create,
1145         .lookup = ecryptfs_lookup,
1146         .link = ecryptfs_link,
1147         .unlink = ecryptfs_unlink,
1148         .symlink = ecryptfs_symlink,
1149         .mkdir = ecryptfs_mkdir,
1150         .rmdir = ecryptfs_rmdir,
1151         .mknod = ecryptfs_mknod,
1152         .rename = ecryptfs_rename,
1153         .permission = ecryptfs_permission,
1154         .setattr = ecryptfs_setattr,
1155         .setxattr = ecryptfs_setxattr,
1156         .getxattr = ecryptfs_getxattr,
1157         .listxattr = ecryptfs_listxattr,
1158         .removexattr = ecryptfs_removexattr
1159 };
1160
1161 const struct inode_operations ecryptfs_main_iops = {
1162         .permission = ecryptfs_permission,
1163         .setattr = ecryptfs_setattr,
1164         .getattr = ecryptfs_getattr,
1165         .setxattr = ecryptfs_setxattr,
1166         .getxattr = ecryptfs_getxattr,
1167         .listxattr = ecryptfs_listxattr,
1168         .removexattr = ecryptfs_removexattr
1169 };