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 /**
  55  * ecryptfs_create_underlying_file
  56  * @lower_dir_inode: inode of the parent in the lower fs of the new file
  57  * @dentry: New file's dentry
  58  * @mode: The mode of the new file
  59  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
  60  *
  61  * Creates the file in the lower file system.
  62  *
  63  * Returns zero on success; non-zero on error condition
  64  */
  65 static int
  66 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
  67                                 struct dentry *dentry, int mode,
  68                                 struct nameidata *nd)
  69 {
  70         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
  71         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
  72         struct dentry *dentry_save;
  73         struct vfsmount *vfsmount_save;
  74         unsigned int flags_save;
  75         int rc;
  76
  77         dentry_save = nd->path.dentry;
  78         vfsmount_save = nd->path.mnt;
  79         flags_save = nd->flags;
  80         nd->path.dentry = lower_dentry;
  81         nd->path.mnt = lower_mnt;
  82         nd->flags &= ~LOOKUP_OPEN;
  83         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
  84         nd->path.dentry = dentry_save;
  85         nd->path.mnt = vfsmount_save;
  86         nd->flags = flags_save;
  87         return rc;
  88 }
  89
  90 /**
  91  * ecryptfs_do_create
  92  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
  93  * @ecryptfs_dentry: New file's dentry in ecryptfs
  94  * @mode: The mode of the new file
  95  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
  96  *
  97  * Creates the underlying file and the eCryptfs inode which will link to
  98  * it. It will also update the eCryptfs directory inode to mimic the
  99  * stat of the lower directory inode.
 100  *
 101  * Returns zero on success; non-zero on error condition
 102  */
 103 static int
 104 ecryptfs_do_create(struct inode *directory_inode,
 105                    struct dentry *ecryptfs_dentry, int mode,
 106                    struct nameidata *nd)
 107 {
 108         int rc;
 109         struct dentry *lower_dentry;
 110         struct dentry *lower_dir_dentry;
 111
 112         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 113         lower_dir_dentry = lock_parent(lower_dentry);
 114         if (IS_ERR(lower_dir_dentry)) {
 115                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
 116                                 "dentry\n");
 117                 rc = PTR_ERR(lower_dir_dentry);
 118                 goto out;
 119         }
 120         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
 121                                              ecryptfs_dentry, mode, nd);
 122         if (rc) {
 123                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 124                        "rc = [%d]\n", __func__, rc);
 125                 goto out_lock;
 126         }
 127         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 128                                 directory_inode->i_sb, 0);
 129         if (rc) {
 130                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
 131                 goto out_lock;
 132         }
 133         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
 134         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
 135 out_lock:
 136         unlock_dir(lower_dir_dentry);
 137 out:
 138         return rc;
 139 }
 140
 141 /**
 142  * grow_file
 143  * @ecryptfs_dentry: the eCryptfs dentry
 144  *
 145  * This is the code which will grow the file to its correct size.
 146  */
 147 static int grow_file(struct dentry *ecryptfs_dentry)
 148 {
 149         struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
 150         char zero_virt[] = { 0x00 };
 151         int rc = 0;
 152
 153         rc = ecryptfs_write(ecryptfs_inode, zero_virt, 0, 1);
 154         i_size_write(ecryptfs_inode, 0);
 155         rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
 156         ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
 157                 ECRYPTFS_NEW_FILE;
 158         return rc;
 159 }
 160
 161 /**
 162  * ecryptfs_initialize_file
 163  *
 164  * Cause the file to be changed from a basic empty file to an ecryptfs
 165  * file with a header and first data page.
 166  *
 167  * Returns zero on success
 168  */
 169 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
 170 {
 171         struct ecryptfs_crypt_stat *crypt_stat =
 172                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
 173         int rc = 0;
 174
 175         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
 176                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 177                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 178                 goto out;
 179         }
 180         crypt_stat->flags |= ECRYPTFS_NEW_FILE;
 181         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 182         rc = ecryptfs_new_file_context(ecryptfs_dentry);
 183         if (rc) {
 184                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 185                                 "context; rc = [%d]\n", rc);
 186                 goto out;
 187         }
 188         rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 189         if (rc) {
 190                 printk(KERN_ERR "%s: Error attempting to initialize "
 191                         "the persistent file for the dentry with name "
 192                         "[%s]; rc = [%d]\n", __func__,
 193                         ecryptfs_dentry->d_name.name, rc);
 194                 goto out;
 195         }
 196         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 197         if (rc) {
 198                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 199                 goto out;
 200         }
 201         rc = grow_file(ecryptfs_dentry);
 202         if (rc)
 203                 printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
 204 out:
 205         return rc;
 206 }
 207
 208 /**
 209  * ecryptfs_create
 210  * @dir: The inode of the directory in which to create the file.
 211  * @dentry: The eCryptfs dentry
 212  * @mode: The mode of the new file.
 213  * @nd: nameidata
 214  *
 215  * Creates a new file.
 216  *
 217  * Returns zero on success; non-zero on error condition
 218  */
 219 static int
 220 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 221                 int mode, struct nameidata *nd)
 222 {
 223         int rc;
 224
 225         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 226         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 227         if (unlikely(rc)) {
 228                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 229                                 "lower filesystem\n");
 230                 goto out;
 231         }
 232         /* At this point, a file exists on "disk"; we need to make sure
 233          * that this on disk file is prepared to be an ecryptfs file */
 234         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 235 out:
 236         return rc;
 237 }
 238
 239 /**
 240  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
 241  */
 242 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 243                                         struct dentry *lower_dentry,
 244                                         struct inode *ecryptfs_dir_inode,
 245                                         struct nameidata *ecryptfs_nd)
 246 {
 247         struct dentry *lower_dir_dentry;
 248         struct vfsmount *lower_mnt;
 249         struct inode *lower_inode;
 250         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 251         struct ecryptfs_crypt_stat *crypt_stat;
 252         char *page_virt = NULL;
 253         u64 file_size;
 254         int rc = 0;
 255
 256         lower_dir_dentry = lower_dentry->d_parent;
 257         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 258                                    ecryptfs_dentry->d_parent));
 259         lower_inode = lower_dentry->d_inode;
 260         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
 261         BUG_ON(!lower_dentry->d_count);
 262         ecryptfs_set_dentry_private(ecryptfs_dentry,
 263                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
 264                                                      GFP_KERNEL));
 265         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
 266                 rc = -ENOMEM;
 267                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 268                        "to allocate ecryptfs_dentry_info struct\n",
 269                         __func__);
 270                 goto out_put;
 271         }
 272         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 273         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
 274         if (!lower_dentry->d_inode) {
 275                 /* We want to add because we couldn't find in lower */
 276                 d_add(ecryptfs_dentry, NULL);
 277                 goto out;
 278         }
 279         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 280                                 ecryptfs_dir_inode->i_sb,
 281                                 ECRYPTFS_INTERPOSE_FLAG_D_ADD);
 282         if (rc) {
 283                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
 284                        __func__, rc);
 285                 goto out;
 286         }
 287         if (S_ISDIR(lower_inode->i_mode))
 288                 goto out;
 289         if (S_ISLNK(lower_inode->i_mode))
 290                 goto out;
 291         if (special_file(lower_inode->i_mode))
 292                 goto out;
 293         if (!ecryptfs_nd)
 294                 goto out;
 295         /* Released in this function */
 296         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
 297         if (!page_virt) {
 298                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
 299                        __func__);
 300                 rc = -ENOMEM;
 301                 goto out;
 302         }
 303         rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 304         if (rc) {
 305                 printk(KERN_ERR "%s: Error attempting to initialize "
 306                         "the persistent file for the dentry with name "
 307                         "[%s]; rc = [%d]\n", __func__,
 308                         ecryptfs_dentry->d_name.name, rc);
 309                 goto out_free_kmem;
 310         }
 311         crypt_stat = &ecryptfs_inode_to_private(
 312                                         ecryptfs_dentry->d_inode)->crypt_stat;
 313         /* TODO: lock for crypt_stat comparison */
 314         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 315                         ecryptfs_set_default_sizes(crypt_stat);
 316         rc = ecryptfs_read_and_validate_header_region(page_virt,
 317                                                       ecryptfs_dentry->d_inode);
 318         if (rc) {
 319                 memset(page_virt, 0, PAGE_CACHE_SIZE);
 320                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 321                                                              ecryptfs_dentry);
 322                 if (rc) {
 323                         rc = 0;
 324                         goto out_free_kmem;
 325                 }
 326                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 327         }
 328         mount_crypt_stat = &ecryptfs_superblock_to_private(
 329                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 330         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
 331                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 332                         file_size = (crypt_stat->metadata_size
 333                                      + i_size_read(lower_dentry->d_inode));
 334                 else
 335                         file_size = i_size_read(lower_dentry->d_inode);
 336         } else {
 337                 file_size = get_unaligned_be64(page_virt);
 338         }
 339         i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
 340 out_free_kmem:
 341         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 342         goto out;
 343 out_put:
 344         dput(lower_dentry);
 345         mntput(lower_mnt);
 346         d_drop(ecryptfs_dentry);
 347 out:
 348         return rc;
 349 }
 350
 351 /**
 352  * ecryptfs_new_lower_dentry
 353  * @name: The name of the new dentry.
 354  * @lower_dir_dentry: Parent directory of the new dentry.
 355  * @nd: nameidata from last lookup.
 356  *
 357  * Create a new dentry or get it from lower parent dir.
 358  */
 359 static struct dentry *
 360 ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_dentry,
 361                           struct nameidata *nd)
 362 {
 363         struct dentry *new_dentry;
 364         struct dentry *tmp;
 365         struct inode *lower_dir_inode;
 366
 367         lower_dir_inode = lower_dir_dentry->d_inode;
 368
 369         tmp = d_alloc(lower_dir_dentry, name);
 370         if (!tmp)
 371                 return ERR_PTR(-ENOMEM);
 372
 373         mutex_lock(&lower_dir_inode->i_mutex);
 374         new_dentry = lower_dir_inode->i_op->lookup(lower_dir_inode, tmp, nd);
 375         mutex_unlock(&lower_dir_inode->i_mutex);
 376
 377         if (!new_dentry)
 378                 new_dentry = tmp;
 379         else
 380                 dput(tmp);
 381
 382         return new_dentry;
 383 }
 384
 385
 386 /**
 387  * ecryptfs_lookup_one_lower
 388  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 389  * @lower_dir_dentry: lower parent directory
 390  * @name: lower file name
 391  *
 392  * Get the lower dentry from vfs. If lower dentry does not exist yet,
 393  * create it.
 394  */
 395 static struct dentry *
 396 ecryptfs_lookup_one_lower(struct dentry *ecryptfs_dentry,
 397                           struct dentry *lower_dir_dentry, struct qstr *name)
 398 {
 399         struct nameidata nd;
 400         struct vfsmount *lower_mnt;
 401         int err;
 402
 403         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 404                                     ecryptfs_dentry->d_parent));
 405         err = vfs_path_lookup(lower_dir_dentry, lower_mnt, name->name , 0, &nd);
 406         mntput(lower_mnt);
 407
 408         if (!err) {
 409                 /* we dont need the mount */
 410                 mntput(nd.path.mnt);
 411                 return nd.path.dentry;
 412         }
 413         if (err != -ENOENT)
 414                 return ERR_PTR(err);
 415
 416         /* create a new lower dentry */
 417         return ecryptfs_new_lower_dentry(name, lower_dir_dentry, &nd);
 418 }
 419
 420 /**
 421  * ecryptfs_lookup
 422  * @ecryptfs_dir_inode: The eCryptfs directory inode
 423  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 424  * @ecryptfs_nd: nameidata; may be NULL
 425  *
 426  * Find a file on disk. If the file does not exist, then we'll add it to the
 427  * dentry cache and continue on to read it from the disk.
 428  */
 429 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 430                                       struct dentry *ecryptfs_dentry,
 431                                       struct nameidata *ecryptfs_nd)
 432 {
 433         char *encrypted_and_encoded_name = NULL;
 434         size_t encrypted_and_encoded_name_size;
 435         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 436         struct dentry *lower_dir_dentry, *lower_dentry;
 437         struct qstr lower_name;
 438         int rc = 0;
 439
 440         if ((ecryptfs_dentry->d_name.len == 1
 441              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 442             || (ecryptfs_dentry->d_name.len == 2
 443                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 444                 goto out_d_drop;
 445         }
 446         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 447         lower_name.name = ecryptfs_dentry->d_name.name;
 448         lower_name.len = ecryptfs_dentry->d_name.len;
 449         lower_name.hash = ecryptfs_dentry->d_name.hash;
 450         if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
 451                 rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
 452                                 lower_dir_dentry->d_inode, &lower_name);
 453                 if (rc < 0)
 454                         goto out_d_drop;
 455         }
 456         lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
 457                                                  lower_dir_dentry, &lower_name);
 458         if (IS_ERR(lower_dentry)) {
 459                 rc = PTR_ERR(lower_dentry);
 460                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
 461                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 462                                 encrypted_and_encoded_name);
 463                 goto out_d_drop;
 464         }
 465         if (lower_dentry->d_inode)
 466                 goto lookup_and_interpose;
 467         mount_crypt_stat = &ecryptfs_superblock_to_private(
 468                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 469         if (!(mount_crypt_stat
 470             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 471                 goto lookup_and_interpose;
 472         dput(lower_dentry);
 473         rc = ecryptfs_encrypt_and_encode_filename(
 474                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 475                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 476                 ecryptfs_dentry->d_name.len);
 477         if (rc) {
 478                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 479                        "filename; rc = [%d]\n", __func__, rc);
 480                 goto out_d_drop;
 481         }
 482         lower_name.name = encrypted_and_encoded_name;
 483         lower_name.len = encrypted_and_encoded_name_size;
 484         lower_name.hash = full_name_hash(lower_name.name, lower_name.len);
 485         if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
 486                 rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
 487                                 lower_dir_dentry->d_inode, &lower_name);
 488                 if (rc < 0)
 489                         goto out_d_drop;
 490         }
 491         lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
 492                                                  lower_dir_dentry, &lower_name);
 493         if (IS_ERR(lower_dentry)) {
 494                 rc = PTR_ERR(lower_dentry);
 495                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
 496                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 497                                 encrypted_and_encoded_name);
 498                 goto out_d_drop;
 499         }
 500 lookup_and_interpose:
 501         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
 502                                                  ecryptfs_dir_inode,
 503                                                  ecryptfs_nd);
 504         goto out;
 505 out_d_drop:
 506         d_drop(ecryptfs_dentry);
 507 out:
 508         kfree(encrypted_and_encoded_name);
 509         return ERR_PTR(rc);
 510 }
 511
 512 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 513                          struct dentry *new_dentry)
 514 {
 515         struct dentry *lower_old_dentry;
 516         struct dentry *lower_new_dentry;
 517         struct dentry *lower_dir_dentry;
 518         u64 file_size_save;
 519         int rc;
 520
 521         file_size_save = i_size_read(old_dentry->d_inode);
 522         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 523         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 524         dget(lower_old_dentry);
 525         dget(lower_new_dentry);
 526         lower_dir_dentry = lock_parent(lower_new_dentry);
 527         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 528                       lower_new_dentry);
 529         if (rc || !lower_new_dentry->d_inode)
 530                 goto out_lock;
 531         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
 532         if (rc)
 533                 goto out_lock;
 534         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 535         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 536         old_dentry->d_inode->i_nlink =
 537                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 538         i_size_write(new_dentry->d_inode, file_size_save);
 539 out_lock:
 540         unlock_dir(lower_dir_dentry);
 541         dput(lower_new_dentry);
 542         dput(lower_old_dentry);
 543         return rc;
 544 }
 545
 546 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 547 {
 548         int rc = 0;
 549         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 550         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 551         struct dentry *lower_dir_dentry;
 552
 553         dget(lower_dentry);
 554         lower_dir_dentry = lock_parent(lower_dentry);
 555         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 556         if (rc) {
 557                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 558                 goto out_unlock;
 559         }
 560         fsstack_copy_attr_times(dir, lower_dir_inode);
 561         dentry->d_inode->i_nlink =
 562                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 563         dentry->d_inode->i_ctime = dir->i_ctime;
 564         d_drop(dentry);
 565 out_unlock:
 566         unlock_dir(lower_dir_dentry);
 567         dput(lower_dentry);
 568         return rc;
 569 }
 570
 571 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 572                             const char *symname)
 573 {
 574         int rc;
 575         struct dentry *lower_dentry;
 576         struct dentry *lower_dir_dentry;
 577         char *encoded_symname;
 578         size_t encoded_symlen;
 579         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 580
 581         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 582         dget(lower_dentry);
 583         lower_dir_dentry = lock_parent(lower_dentry);
 584         mount_crypt_stat = &ecryptfs_superblock_to_private(
 585                 dir->i_sb)->mount_crypt_stat;
 586         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 587                                                   &encoded_symlen,
 588                                                   NULL,
 589                                                   mount_crypt_stat, symname,
 590                                                   strlen(symname));
 591         if (rc)
 592                 goto out_lock;
 593         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 594                          encoded_symname);
 595         kfree(encoded_symname);
 596         if (rc || !lower_dentry->d_inode)
 597                 goto out_lock;
 598         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 599         if (rc)
 600                 goto out_lock;
 601         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 602         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 603 out_lock:
 604         unlock_dir(lower_dir_dentry);
 605         dput(lower_dentry);
 606         if (!dentry->d_inode)
 607                 d_drop(dentry);
 608         return rc;
 609 }
 610
 611 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 612 {
 613         int rc;
 614         struct dentry *lower_dentry;
 615         struct dentry *lower_dir_dentry;
 616
 617         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 618         lower_dir_dentry = lock_parent(lower_dentry);
 619         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 620         if (rc || !lower_dentry->d_inode)
 621                 goto out;
 622         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 623         if (rc)
 624                 goto out;
 625         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 626         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 627         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 628 out:
 629         unlock_dir(lower_dir_dentry);
 630         if (!dentry->d_inode)
 631                 d_drop(dentry);
 632         return rc;
 633 }
 634
 635 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 636 {
 637         struct dentry *lower_dentry;
 638         struct dentry *lower_dir_dentry;
 639         int rc;
 640
 641         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 642         dget(dentry);
 643         lower_dir_dentry = lock_parent(lower_dentry);
 644         dget(lower_dentry);
 645         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 646         dput(lower_dentry);
 647         if (!rc)
 648                 d_delete(lower_dentry);
 649         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 650         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 651         unlock_dir(lower_dir_dentry);
 652         if (!rc)
 653                 d_drop(dentry);
 654         dput(dentry);
 655         return rc;
 656 }
 657
 658 static int
 659 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 660 {
 661         int rc;
 662         struct dentry *lower_dentry;
 663         struct dentry *lower_dir_dentry;
 664
 665         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 666         lower_dir_dentry = lock_parent(lower_dentry);
 667         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 668         if (rc || !lower_dentry->d_inode)
 669                 goto out;
 670         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 671         if (rc)
 672                 goto out;
 673         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 674         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 675 out:
 676         unlock_dir(lower_dir_dentry);
 677         if (!dentry->d_inode)
 678                 d_drop(dentry);
 679         return rc;
 680 }
 681
 682 static int
 683 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 684                 struct inode *new_dir, struct dentry *new_dentry)
 685 {
 686         int rc;
 687         struct dentry *lower_old_dentry;
 688         struct dentry *lower_new_dentry;
 689         struct dentry *lower_old_dir_dentry;
 690         struct dentry *lower_new_dir_dentry;
 691         struct dentry *trap = NULL;
 692
 693         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 694         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 695         dget(lower_old_dentry);
 696         dget(lower_new_dentry);
 697         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 698         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 699         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 700         /* source should not be ancestor of target */
 701         if (trap == lower_old_dentry) {
 702                 rc = -EINVAL;
 703                 goto out_lock;
 704         }
 705         /* target should not be ancestor of source */
 706         if (trap == lower_new_dentry) {
 707                 rc = -ENOTEMPTY;
 708                 goto out_lock;
 709         }
 710         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 711                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 712         if (rc)
 713                 goto out_lock;
 714         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 715         if (new_dir != old_dir)
 716                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 717 out_lock:
 718         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 719         dput(lower_new_dentry->d_parent);
 720         dput(lower_old_dentry->d_parent);
 721         dput(lower_new_dentry);
 722         dput(lower_old_dentry);
 723         return rc;
 724 }
 725
 726 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 727                                    size_t *bufsiz)
 728 {
 729         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 730         char *lower_buf;
 731         size_t lower_bufsiz = PATH_MAX;
 732         mm_segment_t old_fs;
 733         int rc;
 734
 735         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 736         if (!lower_buf) {
 737                 rc = -ENOMEM;
 738                 goto out;
 739         }
 740         old_fs = get_fs();
 741         set_fs(get_ds());
 742         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 743                                                    (char __user *)lower_buf,
 744                                                    lower_bufsiz);
 745         set_fs(old_fs);
 746         if (rc < 0)
 747                 goto out;
 748         lower_bufsiz = rc;
 749         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 750                                                   lower_buf, lower_bufsiz);
 751 out:
 752         kfree(lower_buf);
 753         return rc;
 754 }
 755
 756 static int
 757 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 758 {
 759         char *kbuf;
 760         size_t kbufsiz, copied;
 761         int rc;
 762
 763         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 764         if (rc)
 765                 goto out;
 766         copied = min_t(size_t, bufsiz, kbufsiz);
 767         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 768         kfree(kbuf);
 769         fsstack_copy_attr_atime(dentry->d_inode,
 770                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 771 out:
 772         return rc;
 773 }
 774
 775 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 776 {
 777         char *buf;
 778         int len = PAGE_SIZE, rc;
 779         mm_segment_t old_fs;
 780
 781         /* Released in ecryptfs_put_link(); only release here on error */
 782         buf = kmalloc(len, GFP_KERNEL);
 783         if (!buf) {
 784                 buf = ERR_PTR(-ENOMEM);
 785                 goto out;
 786         }
 787         old_fs = get_fs();
 788         set_fs(get_ds());
 789         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 790         set_fs(old_fs);
 791         if (rc < 0) {
 792                 kfree(buf);
 793                 buf = ERR_PTR(rc);
 794         } else
 795                 buf[rc] = '\0';
 796 out:
 797         nd_set_link(nd, buf);
 798         return NULL;
 799 }
 800
 801 static void
 802 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 803 {
 804         char *buf = nd_get_link(nd);
 805         if (!IS_ERR(buf)) {
 806                 /* Free the char* */
 807                 kfree(buf);
 808         }
 809 }
 810
 811 /**
 812  * upper_size_to_lower_size
 813  * @crypt_stat: Crypt_stat associated with file
 814  * @upper_size: Size of the upper file
 815  *
 816  * Calculate the required size of the lower file based on the
 817  * specified size of the upper file. This calculation is based on the
 818  * number of headers in the underlying file and the extent size.
 819  *
 820  * Returns Calculated size of the lower file.
 821  */
 822 static loff_t
 823 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 824                          loff_t upper_size)
 825 {
 826         loff_t lower_size;
 827
 828         lower_size = ecryptfs_lower_header_size(crypt_stat);
 829         if (upper_size != 0) {
 830                 loff_t num_extents;
 831
 832                 num_extents = upper_size >> crypt_stat->extent_shift;
 833                 if (upper_size & ~crypt_stat->extent_mask)
 834                         num_extents++;
 835                 lower_size += (num_extents * crypt_stat->extent_size);
 836         }
 837         return lower_size;
 838 }
 839
 840 /**
 841  * truncate_upper
 842  * @dentry: The ecryptfs layer dentry
 843  * @ia: Address of the ecryptfs inode's attributes
 844  * @lower_ia: Address of the lower inode's attributes
 845  *
 846  * Function to handle truncations modifying the size of the file. Note
 847  * that the file sizes are interpolated. When expanding, we are simply
 848  * writing strings of 0's out. When truncating, we truncate the upper
 849  * inode and update the lower_ia according to the page index
 850  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 851  * the caller must use lower_ia in a call to notify_change() to perform
 852  * the truncation of the lower inode.
 853  *
 854  * Returns zero on success; non-zero otherwise
 855  */
 856 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 857                           struct iattr *lower_ia)
 858 {
 859         int rc = 0;
 860         struct inode *inode = dentry->d_inode;
 861         struct ecryptfs_crypt_stat *crypt_stat;
 862         loff_t i_size = i_size_read(inode);
 863         loff_t lower_size_before_truncate;
 864         loff_t lower_size_after_truncate;
 865
 866         if (unlikely((ia->ia_size == i_size))) {
 867                 lower_ia->ia_valid &= ~ATTR_SIZE;
 868                 goto out;
 869         }
 870         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 871         /* Switch on growing or shrinking file */
 872         if (ia->ia_size > i_size) {
 873                 char zero[] = { 0x00 };
 874
 875                 lower_ia->ia_valid &= ~ATTR_SIZE;
 876                 /* Write a single 0 at the last position of the file;
 877                  * this triggers code that will fill in 0's throughout
 878                  * the intermediate portion of the previous end of the
 879                  * file and the new and of the file */
 880                 rc = ecryptfs_write(inode, zero,
 881                                     (ia->ia_size - 1), 1);
 882         } else { /* ia->ia_size < i_size_read(inode) */
 883                 /* We're chopping off all the pages down to the page
 884                  * in which ia->ia_size is located. Fill in the end of
 885                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 886                  * PAGE_CACHE_SIZE with zeros. */
 887                 size_t num_zeros = (PAGE_CACHE_SIZE
 888                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 889
 890
 891                 /*
 892                  * XXX(truncate) this should really happen at the begginning
 893                  * of ->setattr.  But the code is too messy to that as part
 894                  * of a larger patch.  ecryptfs is also totally missing out
 895                  * on the inode_change_ok check at the beginning of
 896                  * ->setattr while would include this.
 897                  */
 898                 rc = inode_newsize_ok(inode, ia->ia_size);
 899                 if (rc)
 900                         goto out;
 901
 902                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 903                         truncate_setsize(inode, ia->ia_size);
 904                         lower_ia->ia_size = ia->ia_size;
 905                         lower_ia->ia_valid |= ATTR_SIZE;
 906                         goto out;
 907                 }
 908                 if (num_zeros) {
 909                         char *zeros_virt;
 910
 911                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 912                         if (!zeros_virt) {
 913                                 rc = -ENOMEM;
 914                                 goto out;
 915                         }
 916                         rc = ecryptfs_write(inode, zeros_virt,
 917                                             ia->ia_size, num_zeros);
 918                         kfree(zeros_virt);
 919                         if (rc) {
 920                                 printk(KERN_ERR "Error attempting to zero out "
 921                                        "the remainder of the end page on "
 922                                        "reducing truncate; rc = [%d]\n", rc);
 923                                 goto out;
 924                         }
 925                 }
 926                 truncate_setsize(inode, ia->ia_size);
 927                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 928                 if (rc) {
 929                         printk(KERN_ERR "Problem with "
 930                                "ecryptfs_write_inode_size_to_metadata; "
 931                                "rc = [%d]\n", rc);
 932                         goto out;
 933                 }
 934                 /* We are reducing the size of the ecryptfs file, and need to
 935                  * know if we need to reduce the size of the lower file. */
 936                 lower_size_before_truncate =
 937                     upper_size_to_lower_size(crypt_stat, i_size);
 938                 lower_size_after_truncate =
 939                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 940                 if (lower_size_after_truncate < lower_size_before_truncate) {
 941                         lower_ia->ia_size = lower_size_after_truncate;
 942                         lower_ia->ia_valid |= ATTR_SIZE;
 943                 } else
 944                         lower_ia->ia_valid &= ~ATTR_SIZE;
 945         }
 946 out:
 947         return rc;
 948 }
 949
 950 /**
 951  * ecryptfs_truncate
 952  * @dentry: The ecryptfs layer dentry
 953  * @new_length: The length to expand the file to
 954  *
 955  * Simple function that handles the truncation of an eCryptfs inode and
 956  * its corresponding lower inode.
 957  *
 958  * Returns zero on success; non-zero otherwise
 959  */
 960 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 961 {
 962         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 963         struct iattr lower_ia = { .ia_valid = 0 };
 964         int rc;
 965
 966         rc = truncate_upper(dentry, &ia, &lower_ia);
 967         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 968                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 969
 970                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 971                 rc = notify_change(lower_dentry, &lower_ia);
 972                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 973         }
 974         return rc;
 975 }
 976
 977 static int
 978 ecryptfs_permission(struct inode *inode, int mask, unsigned int flags)
 979 {
 980         if (flags & IPERM_FLAG_RCU)
 981                 return -ECHILD;
 982         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 983 }
 984
 985 /**
 986  * ecryptfs_setattr
 987  * @dentry: dentry handle to the inode to modify
 988  * @ia: Structure with flags of what to change and values
 989  *
 990  * Updates the metadata of an inode. If the update is to the size
 991  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 992  * of both the ecryptfs inode and the lower inode.
 993  *
 994  * All other metadata changes will be passed right to the lower filesystem,
 995  * and we will just update our inode to look like the lower.
 996  */
 997 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 998 {
 999         int rc = 0;
1000         struct dentry *lower_dentry;
1001         struct iattr lower_ia;
1002         struct inode *inode;
1003         struct inode *lower_inode;
1004         struct ecryptfs_crypt_stat *crypt_stat;
1005
1006         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
1007         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
1008                 ecryptfs_init_crypt_stat(crypt_stat);
1009         inode = dentry->d_inode;
1010         lower_inode = ecryptfs_inode_to_lower(inode);
1011         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1012         mutex_lock(&crypt_stat->cs_mutex);
1013         if (S_ISDIR(dentry->d_inode->i_mode))
1014                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
1015         else if (S_ISREG(dentry->d_inode->i_mode)
1016                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
1017                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
1018                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1019
1020                 mount_crypt_stat = &ecryptfs_superblock_to_private(
1021                         dentry->d_sb)->mount_crypt_stat;
1022                 rc = ecryptfs_read_metadata(dentry);
1023                 if (rc) {
1024                         if (!(mount_crypt_stat->flags
1025                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
1026                                 rc = -EIO;
1027                                 printk(KERN_WARNING "Either the lower file "
1028                                        "is not in a valid eCryptfs format, "
1029                                        "or the key could not be retrieved. "
1030                                        "Plaintext passthrough mode is not "
1031                                        "enabled; returning -EIO\n");
1032                                 mutex_unlock(&crypt_stat->cs_mutex);
1033                                 goto out;
1034                         }
1035                         rc = 0;
1036                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
1037                 }
1038         }
1039         mutex_unlock(&crypt_stat->cs_mutex);
1040         memcpy(&lower_ia, ia, sizeof(lower_ia));
1041         if (ia->ia_valid & ATTR_FILE)
1042                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1043         if (ia->ia_valid & ATTR_SIZE) {
1044                 rc = truncate_upper(dentry, ia, &lower_ia);
1045                 if (rc < 0)
1046                         goto out;
1047         }
1048
1049         /*
1050          * mode change is for clearing setuid/setgid bits. Allow lower fs
1051          * to interpret this in its own way.
1052          */
1053         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1054                 lower_ia.ia_valid &= ~ATTR_MODE;
1055
1056         mutex_lock(&lower_dentry->d_inode->i_mutex);
1057         rc = notify_change(lower_dentry, &lower_ia);
1058         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1059 out:
1060         fsstack_copy_attr_all(inode, lower_inode);
1061         return rc;
1062 }
1063
1064 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1065                           struct kstat *stat)
1066 {
1067         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1068         int rc = 0;
1069
1070         mount_crypt_stat = &ecryptfs_superblock_to_private(
1071                                                 dentry->d_sb)->mount_crypt_stat;
1072         generic_fillattr(dentry->d_inode, stat);
1073         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1074                 char *target;
1075                 size_t targetsiz;
1076
1077                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1078                 if (!rc) {
1079                         kfree(target);
1080                         stat->size = targetsiz;
1081                 }
1082         }
1083         return rc;
1084 }
1085
1086 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1087                      struct kstat *stat)
1088 {
1089         struct kstat lower_stat;
1090         int rc;
1091
1092         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1093                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1094         if (!rc) {
1095                 generic_fillattr(dentry->d_inode, stat);
1096                 stat->blocks = lower_stat.blocks;
1097         }
1098         return rc;
1099 }
1100
1101 int
1102 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1103                   size_t size, int flags)
1104 {
1105         int rc = 0;
1106         struct dentry *lower_dentry;
1107
1108         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1109         if (!lower_dentry->d_inode->i_op->setxattr) {
1110                 rc = -EOPNOTSUPP;
1111                 goto out;
1112         }
1113
1114         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1115 out:
1116         return rc;
1117 }
1118
1119 ssize_t
1120 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1121                         void *value, size_t size)
1122 {
1123         int rc = 0;
1124
1125         if (!lower_dentry->d_inode->i_op->getxattr) {
1126                 rc = -EOPNOTSUPP;
1127                 goto out;
1128         }
1129         mutex_lock(&lower_dentry->d_inode->i_mutex);
1130         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1131                                                    size);
1132         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1133 out:
1134         return rc;
1135 }
1136
1137 static ssize_t
1138 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1139                   size_t size)
1140 {
1141         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1142                                        value, size);
1143 }
1144
1145 static ssize_t
1146 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1147 {
1148         int rc = 0;
1149         struct dentry *lower_dentry;
1150
1151         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1152         if (!lower_dentry->d_inode->i_op->listxattr) {
1153                 rc = -EOPNOTSUPP;
1154                 goto out;
1155         }
1156         mutex_lock(&lower_dentry->d_inode->i_mutex);
1157         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1158         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1159 out:
1160         return rc;
1161 }
1162
1163 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1164 {
1165         int rc = 0;
1166         struct dentry *lower_dentry;
1167
1168         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1169         if (!lower_dentry->d_inode->i_op->removexattr) {
1170                 rc = -EOPNOTSUPP;
1171                 goto out;
1172         }
1173         mutex_lock(&lower_dentry->d_inode->i_mutex);
1174         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1175         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1176 out:
1177         return rc;
1178 }
1179
1180 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1181 {
1182         if ((ecryptfs_inode_to_lower(inode)
1183              == (struct inode *)candidate_lower_inode))
1184                 return 1;
1185         else
1186                 return 0;
1187 }
1188
1189 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1190 {
1191         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1192         return 0;
1193 }
1194
1195 const struct inode_operations ecryptfs_symlink_iops = {
1196         .readlink = ecryptfs_readlink,
1197         .follow_link = ecryptfs_follow_link,
1198         .put_link = ecryptfs_put_link,
1199         .permission = ecryptfs_permission,
1200         .setattr = ecryptfs_setattr,
1201         .getattr = ecryptfs_getattr_link,
1202         .setxattr = ecryptfs_setxattr,
1203         .getxattr = ecryptfs_getxattr,
1204         .listxattr = ecryptfs_listxattr,
1205         .removexattr = ecryptfs_removexattr
1206 };
1207
1208 const struct inode_operations ecryptfs_dir_iops = {
1209         .create = ecryptfs_create,
1210         .lookup = ecryptfs_lookup,
1211         .link = ecryptfs_link,
1212         .unlink = ecryptfs_unlink,
1213         .symlink = ecryptfs_symlink,
1214         .mkdir = ecryptfs_mkdir,
1215         .rmdir = ecryptfs_rmdir,
1216         .mknod = ecryptfs_mknod,
1217         .rename = ecryptfs_rename,
1218         .permission = ecryptfs_permission,
1219         .setattr = ecryptfs_setattr,
1220         .setxattr = ecryptfs_setxattr,
1221         .getxattr = ecryptfs_getxattr,
1222         .listxattr = ecryptfs_listxattr,
1223         .removexattr = ecryptfs_removexattr
1224 };
1225
1226 const struct inode_operations ecryptfs_main_iops = {
1227         .permission = ecryptfs_permission,
1228         .setattr = ecryptfs_setattr,
1229         .getattr = ecryptfs_getattr,
1230         .setxattr = ecryptfs_setxattr,
1231         .getxattr = ecryptfs_getxattr,
1232         .listxattr = ecryptfs_listxattr,
1233         .removexattr = ecryptfs_removexattr
1234 };