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