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         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
 189                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 190                 if (rc) {
 191                         printk(KERN_ERR "%s: Error attempting to initialize "
 192                                "the persistent file for the dentry with name "
 193                                "[%s]; rc = [%d]\n", __func__,
 194                                ecryptfs_dentry->d_name.name, rc);
 195                         goto out;
 196                 }
 197         }
 198         rc = ecryptfs_write_metadata(ecryptfs_dentry);
 199         if (rc) {
 200                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 201                 goto out;
 202         }
 203         rc = grow_file(ecryptfs_dentry);
 204         if (rc)
 205                 printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
 206 out:
 207         return rc;
 208 }
 209
 210 /**
 211  * ecryptfs_create
 212  * @dir: The inode of the directory in which to create the file.
 213  * @dentry: The eCryptfs dentry
 214  * @mode: The mode of the new file.
 215  * @nd: nameidata
 216  *
 217  * Creates a new file.
 218  *
 219  * Returns zero on success; non-zero on error condition
 220  */
 221 static int
 222 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 223                 int mode, struct nameidata *nd)
 224 {
 225         int rc;
 226
 227         /* ecryptfs_do_create() calls ecryptfs_interpose() */
 228         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
 229         if (unlikely(rc)) {
 230                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 231                                 "lower filesystem\n");
 232                 goto out;
 233         }
 234         /* At this point, a file exists on "disk"; we need to make sure
 235          * that this on disk file is prepared to be an ecryptfs file */
 236         rc = ecryptfs_initialize_file(ecryptfs_dentry);
 237 out:
 238         return rc;
 239 }
 240
 241 /**
 242  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
 243  */
 244 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 245                                         struct dentry *lower_dentry,
 246                                         struct inode *ecryptfs_dir_inode,
 247                                         struct nameidata *ecryptfs_nd)
 248 {
 249         struct dentry *lower_dir_dentry;
 250         struct vfsmount *lower_mnt;
 251         struct inode *lower_inode;
 252         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 253         struct ecryptfs_crypt_stat *crypt_stat;
 254         char *page_virt = NULL;
 255         u64 file_size;
 256         int rc = 0;
 257
 258         lower_dir_dentry = lower_dentry->d_parent;
 259         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 260                                    ecryptfs_dentry->d_parent));
 261         lower_inode = lower_dentry->d_inode;
 262         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
 263         BUG_ON(!lower_dentry->d_count);
 264         ecryptfs_set_dentry_private(ecryptfs_dentry,
 265                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
 266                                                      GFP_KERNEL));
 267         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
 268                 rc = -ENOMEM;
 269                 printk(KERN_ERR "%s: Out of memory whilst attempting "
 270                        "to allocate ecryptfs_dentry_info struct\n",
 271                         __func__);
 272                 goto out_put;
 273         }
 274         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 275         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
 276         if (!lower_dentry->d_inode) {
 277                 /* We want to add because we couldn't find in lower */
 278                 d_add(ecryptfs_dentry, NULL);
 279                 goto out;
 280         }
 281         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
 282                                 ecryptfs_dir_inode->i_sb,
 283                                 ECRYPTFS_INTERPOSE_FLAG_D_ADD);
 284         if (rc) {
 285                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
 286                        __func__, rc);
 287                 goto out;
 288         }
 289         if (S_ISDIR(lower_inode->i_mode))
 290                 goto out;
 291         if (S_ISLNK(lower_inode->i_mode))
 292                 goto out;
 293         if (special_file(lower_inode->i_mode))
 294                 goto out;
 295         if (!ecryptfs_nd)
 296                 goto out;
 297         /* Released in this function */
 298         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
 299         if (!page_virt) {
 300                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
 301                        __func__);
 302                 rc = -ENOMEM;
 303                 goto out;
 304         }
 305         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
 306                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
 307                 if (rc) {
 308                         printk(KERN_ERR "%s: Error attempting to initialize "
 309                                "the persistent file for the dentry with name "
 310                                "[%s]; rc = [%d]\n", __func__,
 311                                ecryptfs_dentry->d_name.name, rc);
 312                         goto out_free_kmem;
 313                 }
 314         }
 315         crypt_stat = &ecryptfs_inode_to_private(
 316                                         ecryptfs_dentry->d_inode)->crypt_stat;
 317         /* TODO: lock for crypt_stat comparison */
 318         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 319                         ecryptfs_set_default_sizes(crypt_stat);
 320         rc = ecryptfs_read_and_validate_header_region(page_virt,
 321                                                       ecryptfs_dentry->d_inode);
 322         if (rc) {
 323                 memset(page_virt, 0, PAGE_CACHE_SIZE);
 324                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
 325                                                              ecryptfs_dentry);
 326                 if (rc) {
 327                         rc = 0;
 328                         goto out_free_kmem;
 329                 }
 330                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 331         }
 332         mount_crypt_stat = &ecryptfs_superblock_to_private(
 333                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 334         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
 335                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
 336                         file_size = (crypt_stat->metadata_size
 337                                      + i_size_read(lower_dentry->d_inode));
 338                 else
 339                         file_size = i_size_read(lower_dentry->d_inode);
 340         } else {
 341                 file_size = get_unaligned_be64(page_virt);
 342         }
 343         i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
 344 out_free_kmem:
 345         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 346         goto out;
 347 out_put:
 348         dput(lower_dentry);
 349         mntput(lower_mnt);
 350         d_drop(ecryptfs_dentry);
 351 out:
 352         return rc;
 353 }
 354
 355 /**
 356  * ecryptfs_new_lower_dentry
 357  * @name: The name of the new dentry.
 358  * @lower_dir_dentry: Parent directory of the new dentry.
 359  * @nd: nameidata from last lookup.
 360  *
 361  * Create a new dentry or get it from lower parent dir.
 362  */
 363 static struct dentry *
 364 ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_dentry,
 365                           struct nameidata *nd)
 366 {
 367         struct dentry *new_dentry;
 368         struct dentry *tmp;
 369         struct inode *lower_dir_inode;
 370
 371         lower_dir_inode = lower_dir_dentry->d_inode;
 372
 373         tmp = d_alloc(lower_dir_dentry, name);
 374         if (!tmp)
 375                 return ERR_PTR(-ENOMEM);
 376
 377         mutex_lock(&lower_dir_inode->i_mutex);
 378         new_dentry = lower_dir_inode->i_op->lookup(lower_dir_inode, tmp, nd);
 379         mutex_unlock(&lower_dir_inode->i_mutex);
 380
 381         if (!new_dentry)
 382                 new_dentry = tmp;
 383         else
 384                 dput(tmp);
 385
 386         return new_dentry;
 387 }
 388
 389
 390 /**
 391  * ecryptfs_lookup_one_lower
 392  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 393  * @lower_dir_dentry: lower parent directory
 394  * @name: lower file name
 395  *
 396  * Get the lower dentry from vfs. If lower dentry does not exist yet,
 397  * create it.
 398  */
 399 static struct dentry *
 400 ecryptfs_lookup_one_lower(struct dentry *ecryptfs_dentry,
 401                           struct dentry *lower_dir_dentry, struct qstr *name)
 402 {
 403         struct nameidata nd;
 404         struct vfsmount *lower_mnt;
 405         int err;
 406
 407         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
 408                                     ecryptfs_dentry->d_parent));
 409         err = vfs_path_lookup(lower_dir_dentry, lower_mnt, name->name , 0, &nd);
 410         mntput(lower_mnt);
 411
 412         if (!err) {
 413                 /* we dont need the mount */
 414                 mntput(nd.path.mnt);
 415                 return nd.path.dentry;
 416         }
 417         if (err != -ENOENT)
 418                 return ERR_PTR(err);
 419
 420         /* create a new lower dentry */
 421         return ecryptfs_new_lower_dentry(name, lower_dir_dentry, &nd);
 422 }
 423
 424 /**
 425  * ecryptfs_lookup
 426  * @ecryptfs_dir_inode: The eCryptfs directory inode
 427  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 428  * @ecryptfs_nd: nameidata; may be NULL
 429  *
 430  * Find a file on disk. If the file does not exist, then we'll add it to the
 431  * dentry cache and continue on to read it from the disk.
 432  */
 433 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 434                                       struct dentry *ecryptfs_dentry,
 435                                       struct nameidata *ecryptfs_nd)
 436 {
 437         char *encrypted_and_encoded_name = NULL;
 438         size_t encrypted_and_encoded_name_size;
 439         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 440         struct dentry *lower_dir_dentry, *lower_dentry;
 441         struct qstr lower_name;
 442         int rc = 0;
 443
 444         if ((ecryptfs_dentry->d_name.len == 1
 445              && !strcmp(ecryptfs_dentry->d_name.name, "."))
 446             || (ecryptfs_dentry->d_name.len == 2
 447                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
 448                 goto out_d_drop;
 449         }
 450         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 451         lower_name.name = ecryptfs_dentry->d_name.name;
 452         lower_name.len = ecryptfs_dentry->d_name.len;
 453         lower_name.hash = ecryptfs_dentry->d_name.hash;
 454         if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
 455                 rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
 456                                 lower_dir_dentry->d_inode, &lower_name);
 457                 if (rc < 0)
 458                         goto out_d_drop;
 459         }
 460         lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
 461                                                  lower_dir_dentry, &lower_name);
 462         if (IS_ERR(lower_dentry)) {
 463                 rc = PTR_ERR(lower_dentry);
 464                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
 465                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 466                                 encrypted_and_encoded_name);
 467                 goto out_d_drop;
 468         }
 469         if (lower_dentry->d_inode)
 470                 goto lookup_and_interpose;
 471         mount_crypt_stat = &ecryptfs_superblock_to_private(
 472                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 473         if (!(mount_crypt_stat
 474             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 475                 goto lookup_and_interpose;
 476         dput(lower_dentry);
 477         rc = ecryptfs_encrypt_and_encode_filename(
 478                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
 479                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 480                 ecryptfs_dentry->d_name.len);
 481         if (rc) {
 482                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 483                        "filename; rc = [%d]\n", __func__, rc);
 484                 goto out_d_drop;
 485         }
 486         lower_name.name = encrypted_and_encoded_name;
 487         lower_name.len = encrypted_and_encoded_name_size;
 488         lower_name.hash = full_name_hash(lower_name.name, lower_name.len);
 489         if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
 490                 rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
 491                                 lower_dir_dentry->d_inode, &lower_name);
 492                 if (rc < 0)
 493                         goto out_d_drop;
 494         }
 495         lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
 496                                                  lower_dir_dentry, &lower_name);
 497         if (IS_ERR(lower_dentry)) {
 498                 rc = PTR_ERR(lower_dentry);
 499                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
 500                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
 501                                 encrypted_and_encoded_name);
 502                 goto out_d_drop;
 503         }
 504 lookup_and_interpose:
 505         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
 506                                                  ecryptfs_dir_inode,
 507                                                  ecryptfs_nd);
 508         goto out;
 509 out_d_drop:
 510         d_drop(ecryptfs_dentry);
 511 out:
 512         kfree(encrypted_and_encoded_name);
 513         return ERR_PTR(rc);
 514 }
 515
 516 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 517                          struct dentry *new_dentry)
 518 {
 519         struct dentry *lower_old_dentry;
 520         struct dentry *lower_new_dentry;
 521         struct dentry *lower_dir_dentry;
 522         u64 file_size_save;
 523         int rc;
 524
 525         file_size_save = i_size_read(old_dentry->d_inode);
 526         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 527         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 528         dget(lower_old_dentry);
 529         dget(lower_new_dentry);
 530         lower_dir_dentry = lock_parent(lower_new_dentry);
 531         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
 532                       lower_new_dentry);
 533         if (rc || !lower_new_dentry->d_inode)
 534                 goto out_lock;
 535         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
 536         if (rc)
 537                 goto out_lock;
 538         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 539         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 540         old_dentry->d_inode->i_nlink =
 541                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
 542         i_size_write(new_dentry->d_inode, file_size_save);
 543 out_lock:
 544         unlock_dir(lower_dir_dentry);
 545         dput(lower_new_dentry);
 546         dput(lower_old_dentry);
 547         return rc;
 548 }
 549
 550 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 551 {
 552         int rc = 0;
 553         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 554         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
 555         struct dentry *lower_dir_dentry;
 556
 557         dget(lower_dentry);
 558         lower_dir_dentry = lock_parent(lower_dentry);
 559         rc = vfs_unlink(lower_dir_inode, lower_dentry);
 560         if (rc) {
 561                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 562                 goto out_unlock;
 563         }
 564         fsstack_copy_attr_times(dir, lower_dir_inode);
 565         dentry->d_inode->i_nlink =
 566                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
 567         dentry->d_inode->i_ctime = dir->i_ctime;
 568         d_drop(dentry);
 569 out_unlock:
 570         unlock_dir(lower_dir_dentry);
 571         dput(lower_dentry);
 572         return rc;
 573 }
 574
 575 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 576                             const char *symname)
 577 {
 578         int rc;
 579         struct dentry *lower_dentry;
 580         struct dentry *lower_dir_dentry;
 581         char *encoded_symname;
 582         size_t encoded_symlen;
 583         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 584
 585         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 586         dget(lower_dentry);
 587         lower_dir_dentry = lock_parent(lower_dentry);
 588         mount_crypt_stat = &ecryptfs_superblock_to_private(
 589                 dir->i_sb)->mount_crypt_stat;
 590         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 591                                                   &encoded_symlen,
 592                                                   NULL,
 593                                                   mount_crypt_stat, symname,
 594                                                   strlen(symname));
 595         if (rc)
 596                 goto out_lock;
 597         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
 598                          encoded_symname);
 599         kfree(encoded_symname);
 600         if (rc || !lower_dentry->d_inode)
 601                 goto out_lock;
 602         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 603         if (rc)
 604                 goto out_lock;
 605         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 606         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 607 out_lock:
 608         unlock_dir(lower_dir_dentry);
 609         dput(lower_dentry);
 610         if (!dentry->d_inode)
 611                 d_drop(dentry);
 612         return rc;
 613 }
 614
 615 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 616 {
 617         int rc;
 618         struct dentry *lower_dentry;
 619         struct dentry *lower_dir_dentry;
 620
 621         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 622         lower_dir_dentry = lock_parent(lower_dentry);
 623         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
 624         if (rc || !lower_dentry->d_inode)
 625                 goto out;
 626         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 627         if (rc)
 628                 goto out;
 629         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 630         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 631         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 632 out:
 633         unlock_dir(lower_dir_dentry);
 634         if (!dentry->d_inode)
 635                 d_drop(dentry);
 636         return rc;
 637 }
 638
 639 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 640 {
 641         struct dentry *lower_dentry;
 642         struct dentry *lower_dir_dentry;
 643         int rc;
 644
 645         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 646         dget(dentry);
 647         lower_dir_dentry = lock_parent(lower_dentry);
 648         dget(lower_dentry);
 649         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
 650         dput(lower_dentry);
 651         if (!rc)
 652                 d_delete(lower_dentry);
 653         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 654         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
 655         unlock_dir(lower_dir_dentry);
 656         if (!rc)
 657                 d_drop(dentry);
 658         dput(dentry);
 659         return rc;
 660 }
 661
 662 static int
 663 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 664 {
 665         int rc;
 666         struct dentry *lower_dentry;
 667         struct dentry *lower_dir_dentry;
 668
 669         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 670         lower_dir_dentry = lock_parent(lower_dentry);
 671         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
 672         if (rc || !lower_dentry->d_inode)
 673                 goto out;
 674         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
 675         if (rc)
 676                 goto out;
 677         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
 678         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
 679 out:
 680         unlock_dir(lower_dir_dentry);
 681         if (!dentry->d_inode)
 682                 d_drop(dentry);
 683         return rc;
 684 }
 685
 686 static int
 687 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 688                 struct inode *new_dir, struct dentry *new_dentry)
 689 {
 690         int rc;
 691         struct dentry *lower_old_dentry;
 692         struct dentry *lower_new_dentry;
 693         struct dentry *lower_old_dir_dentry;
 694         struct dentry *lower_new_dir_dentry;
 695         struct dentry *trap = NULL;
 696
 697         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 698         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 699         dget(lower_old_dentry);
 700         dget(lower_new_dentry);
 701         lower_old_dir_dentry = dget_parent(lower_old_dentry);
 702         lower_new_dir_dentry = dget_parent(lower_new_dentry);
 703         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 704         /* source should not be ancestor of target */
 705         if (trap == lower_old_dentry) {
 706                 rc = -EINVAL;
 707                 goto out_lock;
 708         }
 709         /* target should not be ancestor of source */
 710         if (trap == lower_new_dentry) {
 711                 rc = -ENOTEMPTY;
 712                 goto out_lock;
 713         }
 714         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
 715                         lower_new_dir_dentry->d_inode, lower_new_dentry);
 716         if (rc)
 717                 goto out_lock;
 718         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
 719         if (new_dir != old_dir)
 720                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
 721 out_lock:
 722         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 723         dput(lower_new_dentry->d_parent);
 724         dput(lower_old_dentry->d_parent);
 725         dput(lower_new_dentry);
 726         dput(lower_old_dentry);
 727         return rc;
 728 }
 729
 730 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
 731                                    size_t *bufsiz)
 732 {
 733         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 734         char *lower_buf;
 735         size_t lower_bufsiz = PATH_MAX;
 736         mm_segment_t old_fs;
 737         int rc;
 738
 739         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
 740         if (!lower_buf) {
 741                 rc = -ENOMEM;
 742                 goto out;
 743         }
 744         old_fs = get_fs();
 745         set_fs(get_ds());
 746         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
 747                                                    (char __user *)lower_buf,
 748                                                    lower_bufsiz);
 749         set_fs(old_fs);
 750         if (rc < 0)
 751                 goto out;
 752         lower_bufsiz = rc;
 753         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
 754                                                   lower_buf, lower_bufsiz);
 755 out:
 756         kfree(lower_buf);
 757         return rc;
 758 }
 759
 760 static int
 761 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
 762 {
 763         char *kbuf;
 764         size_t kbufsiz, copied;
 765         int rc;
 766
 767         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
 768         if (rc)
 769                 goto out;
 770         copied = min_t(size_t, bufsiz, kbufsiz);
 771         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
 772         kfree(kbuf);
 773         fsstack_copy_attr_atime(dentry->d_inode,
 774                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
 775 out:
 776         return rc;
 777 }
 778
 779 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 780 {
 781         char *buf;
 782         int len = PAGE_SIZE, rc;
 783         mm_segment_t old_fs;
 784
 785         /* Released in ecryptfs_put_link(); only release here on error */
 786         buf = kmalloc(len, GFP_KERNEL);
 787         if (!buf) {
 788                 buf = ERR_PTR(-ENOMEM);
 789                 goto out;
 790         }
 791         old_fs = get_fs();
 792         set_fs(get_ds());
 793         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
 794         set_fs(old_fs);
 795         if (rc < 0) {
 796                 kfree(buf);
 797                 buf = ERR_PTR(rc);
 798         } else
 799                 buf[rc] = '\0';
 800 out:
 801         nd_set_link(nd, buf);
 802         return NULL;
 803 }
 804
 805 static void
 806 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
 807 {
 808         char *buf = nd_get_link(nd);
 809         if (!IS_ERR(buf)) {
 810                 /* Free the char* */
 811                 kfree(buf);
 812         }
 813 }
 814
 815 /**
 816  * upper_size_to_lower_size
 817  * @crypt_stat: Crypt_stat associated with file
 818  * @upper_size: Size of the upper file
 819  *
 820  * Calculate the required size of the lower file based on the
 821  * specified size of the upper file. This calculation is based on the
 822  * number of headers in the underlying file and the extent size.
 823  *
 824  * Returns Calculated size of the lower file.
 825  */
 826 static loff_t
 827 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 828                          loff_t upper_size)
 829 {
 830         loff_t lower_size;
 831
 832         lower_size = ecryptfs_lower_header_size(crypt_stat);
 833         if (upper_size != 0) {
 834                 loff_t num_extents;
 835
 836                 num_extents = upper_size >> crypt_stat->extent_shift;
 837                 if (upper_size & ~crypt_stat->extent_mask)
 838                         num_extents++;
 839                 lower_size += (num_extents * crypt_stat->extent_size);
 840         }
 841         return lower_size;
 842 }
 843
 844 /**
 845  * truncate_upper
 846  * @dentry: The ecryptfs layer dentry
 847  * @ia: Address of the ecryptfs inode's attributes
 848  * @lower_ia: Address of the lower inode's attributes
 849  *
 850  * Function to handle truncations modifying the size of the file. Note
 851  * that the file sizes are interpolated. When expanding, we are simply
 852  * writing strings of 0's out. When truncating, we truncate the upper
 853  * inode and update the lower_ia according to the page index
 854  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 855  * the caller must use lower_ia in a call to notify_change() to perform
 856  * the truncation of the lower inode.
 857  *
 858  * Returns zero on success; non-zero otherwise
 859  */
 860 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 861                           struct iattr *lower_ia)
 862 {
 863         int rc = 0;
 864         struct inode *inode = dentry->d_inode;
 865         struct ecryptfs_crypt_stat *crypt_stat;
 866         loff_t i_size = i_size_read(inode);
 867         loff_t lower_size_before_truncate;
 868         loff_t lower_size_after_truncate;
 869
 870         if (unlikely((ia->ia_size == i_size))) {
 871                 lower_ia->ia_valid &= ~ATTR_SIZE;
 872                 goto out;
 873         }
 874         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 875         /* Switch on growing or shrinking file */
 876         if (ia->ia_size > i_size) {
 877                 char zero[] = { 0x00 };
 878
 879                 lower_ia->ia_valid &= ~ATTR_SIZE;
 880                 /* Write a single 0 at the last position of the file;
 881                  * this triggers code that will fill in 0's throughout
 882                  * the intermediate portion of the previous end of the
 883                  * file and the new and of the file */
 884                 rc = ecryptfs_write(inode, zero,
 885                                     (ia->ia_size - 1), 1);
 886         } else { /* ia->ia_size < i_size_read(inode) */
 887                 /* We're chopping off all the pages down to the page
 888                  * in which ia->ia_size is located. Fill in the end of
 889                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
 890                  * PAGE_CACHE_SIZE with zeros. */
 891                 size_t num_zeros = (PAGE_CACHE_SIZE
 892                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
 893
 894
 895                 /*
 896                  * XXX(truncate) this should really happen at the begginning
 897                  * of ->setattr.  But the code is too messy to that as part
 898                  * of a larger patch.  ecryptfs is also totally missing out
 899                  * on the inode_change_ok check at the beginning of
 900                  * ->setattr while would include this.
 901                  */
 902                 rc = inode_newsize_ok(inode, ia->ia_size);
 903                 if (rc)
 904                         goto out;
 905
 906                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 907                         truncate_setsize(inode, ia->ia_size);
 908                         lower_ia->ia_size = ia->ia_size;
 909                         lower_ia->ia_valid |= ATTR_SIZE;
 910                         goto out;
 911                 }
 912                 if (num_zeros) {
 913                         char *zeros_virt;
 914
 915                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 916                         if (!zeros_virt) {
 917                                 rc = -ENOMEM;
 918                                 goto out;
 919                         }
 920                         rc = ecryptfs_write(inode, zeros_virt,
 921                                             ia->ia_size, num_zeros);
 922                         kfree(zeros_virt);
 923                         if (rc) {
 924                                 printk(KERN_ERR "Error attempting to zero out "
 925                                        "the remainder of the end page on "
 926                                        "reducing truncate; rc = [%d]\n", rc);
 927                                 goto out;
 928                         }
 929                 }
 930                 truncate_setsize(inode, ia->ia_size);
 931                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 932                 if (rc) {
 933                         printk(KERN_ERR "Problem with "
 934                                "ecryptfs_write_inode_size_to_metadata; "
 935                                "rc = [%d]\n", rc);
 936                         goto out;
 937                 }
 938                 /* We are reducing the size of the ecryptfs file, and need to
 939                  * know if we need to reduce the size of the lower file. */
 940                 lower_size_before_truncate =
 941                     upper_size_to_lower_size(crypt_stat, i_size);
 942                 lower_size_after_truncate =
 943                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 944                 if (lower_size_after_truncate < lower_size_before_truncate) {
 945                         lower_ia->ia_size = lower_size_after_truncate;
 946                         lower_ia->ia_valid |= ATTR_SIZE;
 947                 } else
 948                         lower_ia->ia_valid &= ~ATTR_SIZE;
 949         }
 950 out:
 951         return rc;
 952 }
 953
 954 /**
 955  * ecryptfs_truncate
 956  * @dentry: The ecryptfs layer dentry
 957  * @new_length: The length to expand the file to
 958  *
 959  * Simple function that handles the truncation of an eCryptfs inode and
 960  * its corresponding lower inode.
 961  *
 962  * Returns zero on success; non-zero otherwise
 963  */
 964 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 965 {
 966         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 967         struct iattr lower_ia = { .ia_valid = 0 };
 968         int rc;
 969
 970         rc = truncate_upper(dentry, &ia, &lower_ia);
 971         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 972                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 973
 974                 mutex_lock(&lower_dentry->d_inode->i_mutex);
 975                 rc = notify_change(lower_dentry, &lower_ia);
 976                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
 977         }
 978         return rc;
 979 }
 980
 981 static int
 982 ecryptfs_permission(struct inode *inode, int mask, unsigned int flags)
 983 {
 984         if (flags & IPERM_FLAG_RCU)
 985                 return -ECHILD;
 986         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
 987 }
 988
 989 /**
 990  * ecryptfs_setattr
 991  * @dentry: dentry handle to the inode to modify
 992  * @ia: Structure with flags of what to change and values
 993  *
 994  * Updates the metadata of an inode. If the update is to the size
 995  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 996  * of both the ecryptfs inode and the lower inode.
 997  *
 998  * All other metadata changes will be passed right to the lower filesystem,
 999  * and we will just update our inode to look like the lower.
1000  */
1001 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
1002 {
1003         int rc = 0;
1004         struct dentry *lower_dentry;
1005         struct iattr lower_ia;
1006         struct inode *inode;
1007         struct inode *lower_inode;
1008         struct ecryptfs_crypt_stat *crypt_stat;
1009
1010         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
1011         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
1012                 ecryptfs_init_crypt_stat(crypt_stat);
1013         inode = dentry->d_inode;
1014         lower_inode = ecryptfs_inode_to_lower(inode);
1015         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1016         mutex_lock(&crypt_stat->cs_mutex);
1017         if (S_ISDIR(dentry->d_inode->i_mode))
1018                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
1019         else if (S_ISREG(dentry->d_inode->i_mode)
1020                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
1021                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
1022                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1023
1024                 mount_crypt_stat = &ecryptfs_superblock_to_private(
1025                         dentry->d_sb)->mount_crypt_stat;
1026                 rc = ecryptfs_read_metadata(dentry);
1027                 if (rc) {
1028                         if (!(mount_crypt_stat->flags
1029                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
1030                                 rc = -EIO;
1031                                 printk(KERN_WARNING "Either the lower file "
1032                                        "is not in a valid eCryptfs format, "
1033                                        "or the key could not be retrieved. "
1034                                        "Plaintext passthrough mode is not "
1035                                        "enabled; returning -EIO\n");
1036                                 mutex_unlock(&crypt_stat->cs_mutex);
1037                                 goto out;
1038                         }
1039                         rc = 0;
1040                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
1041                 }
1042         }
1043         mutex_unlock(&crypt_stat->cs_mutex);
1044         memcpy(&lower_ia, ia, sizeof(lower_ia));
1045         if (ia->ia_valid & ATTR_FILE)
1046                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1047         if (ia->ia_valid & ATTR_SIZE) {
1048                 rc = truncate_upper(dentry, ia, &lower_ia);
1049                 if (rc < 0)
1050                         goto out;
1051         }
1052
1053         /*
1054          * mode change is for clearing setuid/setgid bits. Allow lower fs
1055          * to interpret this in its own way.
1056          */
1057         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1058                 lower_ia.ia_valid &= ~ATTR_MODE;
1059
1060         mutex_lock(&lower_dentry->d_inode->i_mutex);
1061         rc = notify_change(lower_dentry, &lower_ia);
1062         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1063 out:
1064         fsstack_copy_attr_all(inode, lower_inode);
1065         return rc;
1066 }
1067
1068 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1069                           struct kstat *stat)
1070 {
1071         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1072         int rc = 0;
1073
1074         mount_crypt_stat = &ecryptfs_superblock_to_private(
1075                                                 dentry->d_sb)->mount_crypt_stat;
1076         generic_fillattr(dentry->d_inode, stat);
1077         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1078                 char *target;
1079                 size_t targetsiz;
1080
1081                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1082                 if (!rc) {
1083                         kfree(target);
1084                         stat->size = targetsiz;
1085                 }
1086         }
1087         return rc;
1088 }
1089
1090 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1091                      struct kstat *stat)
1092 {
1093         struct kstat lower_stat;
1094         int rc;
1095
1096         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1097                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1098         if (!rc) {
1099                 generic_fillattr(dentry->d_inode, stat);
1100                 stat->blocks = lower_stat.blocks;
1101         }
1102         return rc;
1103 }
1104
1105 int
1106 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1107                   size_t size, int flags)
1108 {
1109         int rc = 0;
1110         struct dentry *lower_dentry;
1111
1112         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1113         if (!lower_dentry->d_inode->i_op->setxattr) {
1114                 rc = -EOPNOTSUPP;
1115                 goto out;
1116         }
1117
1118         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1119 out:
1120         return rc;
1121 }
1122
1123 ssize_t
1124 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1125                         void *value, size_t size)
1126 {
1127         int rc = 0;
1128
1129         if (!lower_dentry->d_inode->i_op->getxattr) {
1130                 rc = -EOPNOTSUPP;
1131                 goto out;
1132         }
1133         mutex_lock(&lower_dentry->d_inode->i_mutex);
1134         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1135                                                    size);
1136         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1137 out:
1138         return rc;
1139 }
1140
1141 static ssize_t
1142 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1143                   size_t size)
1144 {
1145         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1146                                        value, size);
1147 }
1148
1149 static ssize_t
1150 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1151 {
1152         int rc = 0;
1153         struct dentry *lower_dentry;
1154
1155         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1156         if (!lower_dentry->d_inode->i_op->listxattr) {
1157                 rc = -EOPNOTSUPP;
1158                 goto out;
1159         }
1160         mutex_lock(&lower_dentry->d_inode->i_mutex);
1161         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1162         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1163 out:
1164         return rc;
1165 }
1166
1167 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1168 {
1169         int rc = 0;
1170         struct dentry *lower_dentry;
1171
1172         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1173         if (!lower_dentry->d_inode->i_op->removexattr) {
1174                 rc = -EOPNOTSUPP;
1175                 goto out;
1176         }
1177         mutex_lock(&lower_dentry->d_inode->i_mutex);
1178         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1179         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1180 out:
1181         return rc;
1182 }
1183
1184 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1185 {
1186         if ((ecryptfs_inode_to_lower(inode)
1187              == (struct inode *)candidate_lower_inode))
1188                 return 1;
1189         else
1190                 return 0;
1191 }
1192
1193 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1194 {
1195         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1196         return 0;
1197 }
1198
1199 const struct inode_operations ecryptfs_symlink_iops = {
1200         .readlink = ecryptfs_readlink,
1201         .follow_link = ecryptfs_follow_link,
1202         .put_link = ecryptfs_put_link,
1203         .permission = ecryptfs_permission,
1204         .setattr = ecryptfs_setattr,
1205         .getattr = ecryptfs_getattr_link,
1206         .setxattr = ecryptfs_setxattr,
1207         .getxattr = ecryptfs_getxattr,
1208         .listxattr = ecryptfs_listxattr,
1209         .removexattr = ecryptfs_removexattr
1210 };
1211
1212 const struct inode_operations ecryptfs_dir_iops = {
1213         .create = ecryptfs_create,
1214         .lookup = ecryptfs_lookup,
1215         .link = ecryptfs_link,
1216         .unlink = ecryptfs_unlink,
1217         .symlink = ecryptfs_symlink,
1218         .mkdir = ecryptfs_mkdir,
1219         .rmdir = ecryptfs_rmdir,
1220         .mknod = ecryptfs_mknod,
1221         .rename = ecryptfs_rename,
1222         .permission = ecryptfs_permission,
1223         .setattr = ecryptfs_setattr,
1224         .setxattr = ecryptfs_setxattr,
1225         .getxattr = ecryptfs_getxattr,
1226         .listxattr = ecryptfs_listxattr,
1227         .removexattr = ecryptfs_removexattr
1228 };
1229
1230 const struct inode_operations ecryptfs_main_iops = {
1231         .permission = ecryptfs_permission,
1232         .setattr = ecryptfs_setattr,
1233         .getattr = ecryptfs_getattr,
1234         .setxattr = ecryptfs_setxattr,
1235         .getxattr = ecryptfs_getxattr,
1236         .listxattr = ecryptfs_listxattr,
1237         .removexattr = ecryptfs_removexattr
1238 };