fs/ecryptfs/inode.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * eCryptfs: Linux filesystem encryption layer
   4  *
   5  * Copyright (C) 1997-2004 Erez Zadok
   6  * Copyright (C) 2001-2004 Stony Brook University
   7  * Copyright (C) 2004-2007 International Business Machines Corp.
   8  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
   9  *              Michael C. Thompsion <mcthomps@us.ibm.com>
  10  */
  11
  12 #include <linux/file.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/pagemap.h>
  15 #include <linux/dcache.h>
  16 #include <linux/namei.h>
  17 #include <linux/mount.h>
  18 #include <linux/fs_stack.h>
  19 #include <linux/slab.h>
  20 #include <linux/xattr.h>
  21 #include <linux/posix_acl.h>
  22 #include <linux/posix_acl_xattr.h>
  23 #include <linux/fileattr.h>
  24 #include <linux/unaligned.h>
  25 #include "ecryptfs_kernel.h"
  26
  27 static int lock_parent(struct dentry *dentry,
  28                        struct dentry **lower_dentry,
  29                        struct inode **lower_dir)
  30 {
  31         struct dentry *lower_dir_dentry;
  32
  33         lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
  34         *lower_dir = d_inode(lower_dir_dentry);
  35         *lower_dentry = ecryptfs_dentry_to_lower(dentry);
  36
  37         inode_lock_nested(*lower_dir, I_MUTEX_PARENT);
  38         return (*lower_dentry)->d_parent == lower_dir_dentry ? 0 : -EINVAL;
  39 }
  40
  41 static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
  42 {
  43         return ecryptfs_inode_to_lower(inode) == lower_inode;
  44 }
  45
  46 static int ecryptfs_inode_set(struct inode *inode, void *opaque)
  47 {
  48         struct inode *lower_inode = opaque;
  49
  50         ecryptfs_set_inode_lower(inode, lower_inode);
  51         fsstack_copy_attr_all(inode, lower_inode);
  52         /* i_size will be overwritten for encrypted regular files */
  53         fsstack_copy_inode_size(inode, lower_inode);
  54         inode->i_ino = lower_inode->i_ino;
  55         inode->i_mapping->a_ops = &ecryptfs_aops;
  56
  57         if (S_ISLNK(inode->i_mode))
  58                 inode->i_op = &ecryptfs_symlink_iops;
  59         else if (S_ISDIR(inode->i_mode))
  60                 inode->i_op = &ecryptfs_dir_iops;
  61         else
  62                 inode->i_op = &ecryptfs_main_iops;
  63
  64         if (S_ISDIR(inode->i_mode))
  65                 inode->i_fop = &ecryptfs_dir_fops;
  66         else if (special_file(inode->i_mode))
  67                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  68         else
  69                 inode->i_fop = &ecryptfs_main_fops;
  70
  71         return 0;
  72 }
  73
  74 static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
  75                                           struct super_block *sb)
  76 {
  77         struct inode *inode;
  78
  79         if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
  80                 return ERR_PTR(-EXDEV);
  81
  82         /* Reject dealing with casefold directories. */
  83         if (IS_CASEFOLDED(lower_inode)) {
  84                 pr_err_ratelimited("%s: Can't handle casefolded directory.\n",
  85                                    __func__);
  86                 return ERR_PTR(-EREMOTE);
  87         }
  88
  89         if (!igrab(lower_inode))
  90                 return ERR_PTR(-ESTALE);
  91         inode = iget5_locked(sb, (unsigned long)lower_inode,
  92                              ecryptfs_inode_test, ecryptfs_inode_set,
  93                              lower_inode);
  94         if (!inode) {
  95                 iput(lower_inode);
  96                 return ERR_PTR(-EACCES);
  97         }
  98         if (!(inode->i_state & I_NEW))
  99                 iput(lower_inode);
 100
 101         return inode;
 102 }
 103
 104 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
 105                                  struct super_block *sb)
 106 {
 107         struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
 108
 109         if (!IS_ERR(inode) && (inode->i_state & I_NEW))
 110                 unlock_new_inode(inode);
 111
 112         return inode;
 113 }
 114
 115 /**
 116  * ecryptfs_interpose
 117  * @lower_dentry: Existing dentry in the lower filesystem
 118  * @dentry: ecryptfs' dentry
 119  * @sb: ecryptfs's super_block
 120  *
 121  * Interposes upper and lower dentries.
 122  *
 123  * Returns zero on success; non-zero otherwise
 124  */
 125 static int ecryptfs_interpose(struct dentry *lower_dentry,
 126                               struct dentry *dentry, struct super_block *sb)
 127 {
 128         struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb);
 129
 130         if (IS_ERR(inode))
 131                 return PTR_ERR(inode);
 132         d_instantiate(dentry, inode);
 133
 134         return 0;
 135 }
 136
 137 static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
 138                               struct inode *inode)
 139 {
 140         struct dentry *lower_dentry;
 141         struct inode *lower_dir;
 142         int rc;
 143
 144         rc = lock_parent(dentry, &lower_dentry, &lower_dir);
 145         dget(lower_dentry);     // don't even try to make the lower negative
 146         if (!rc) {
 147                 if (d_unhashed(lower_dentry))
 148                         rc = -EINVAL;
 149                 else
 150                         rc = vfs_unlink(&nop_mnt_idmap, lower_dir, lower_dentry,
 151                                         NULL);
 152         }
 153         if (rc) {
 154                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 155                 goto out_unlock;
 156         }
 157         fsstack_copy_attr_times(dir, lower_dir);
 158         set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
 159         inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
 160 out_unlock:
 161         dput(lower_dentry);
 162         inode_unlock(lower_dir);
 163         if (!rc)
 164                 d_drop(dentry);
 165         return rc;
 166 }
 167
 168 /**
 169  * ecryptfs_do_create
 170  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
 171  * @ecryptfs_dentry: New file's dentry in ecryptfs
 172  * @mode: The mode of the new file
 173  *
 174  * Creates the underlying file and the eCryptfs inode which will link to
 175  * it. It will also update the eCryptfs directory inode to mimic the
 176  * stat of the lower directory inode.
 177  *
 178  * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
 179  */
 180 static struct inode *
 181 ecryptfs_do_create(struct inode *directory_inode,
 182                    struct dentry *ecryptfs_dentry, umode_t mode)
 183 {
 184         int rc;
 185         struct dentry *lower_dentry;
 186         struct inode *lower_dir;
 187         struct inode *inode;
 188
 189         rc = lock_parent(ecryptfs_dentry, &lower_dentry, &lower_dir);
 190         if (!rc)
 191                 rc = vfs_create(&nop_mnt_idmap, lower_dir,
 192                                 lower_dentry, mode, true);
 193         if (rc) {
 194                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 195                        "rc = [%d]\n", __func__, rc);
 196                 inode = ERR_PTR(rc);
 197                 goto out_lock;
 198         }
 199         inode = __ecryptfs_get_inode(d_inode(lower_dentry),
 200                                      directory_inode->i_sb);
 201         if (IS_ERR(inode)) {
 202                 vfs_unlink(&nop_mnt_idmap, lower_dir, lower_dentry, NULL);
 203                 goto out_lock;
 204         }
 205         fsstack_copy_attr_times(directory_inode, lower_dir);
 206         fsstack_copy_inode_size(directory_inode, lower_dir);
 207 out_lock:
 208         inode_unlock(lower_dir);
 209         return inode;
 210 }
 211
 212 /*
 213  * ecryptfs_initialize_file
 214  *
 215  * Cause the file to be changed from a basic empty file to an ecryptfs
 216  * file with a header and first data page.
 217  *
 218  * Returns zero on success
 219  */
 220 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
 221                              struct inode *ecryptfs_inode)
 222 {
 223         struct ecryptfs_crypt_stat *crypt_stat =
 224                 &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
 225         int rc = 0;
 226
 227         if (S_ISDIR(ecryptfs_inode->i_mode)) {
 228                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
 229                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 230                 goto out;
 231         }
 232         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
 233         rc = ecryptfs_new_file_context(ecryptfs_inode);
 234         if (rc) {
 235                 ecryptfs_printk(KERN_ERR, "Error creating new file "
 236                                 "context; rc = [%d]\n", rc);
 237                 goto out;
 238         }
 239         rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
 240         if (rc) {
 241                 printk(KERN_ERR "%s: Error attempting to initialize "
 242                         "the lower file for the dentry with name "
 243                         "[%pd]; rc = [%d]\n", __func__,
 244                         ecryptfs_dentry, rc);
 245                 goto out;
 246         }
 247         rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
 248         if (rc)
 249                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
 250         ecryptfs_put_lower_file(ecryptfs_inode);
 251 out:
 252         return rc;
 253 }
 254
 255 /*
 256  * ecryptfs_create
 257  * @mode: The mode of the new file.
 258  *
 259  * Creates a new file.
 260  *
 261  * Returns zero on success; non-zero on error condition
 262  */
 263 static int
 264 ecryptfs_create(struct mnt_idmap *idmap,
 265                 struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 266                 umode_t mode, bool excl)
 267 {
 268         struct inode *ecryptfs_inode;
 269         int rc;
 270
 271         ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
 272                                             mode);
 273         if (IS_ERR(ecryptfs_inode)) {
 274                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
 275                                 "lower filesystem\n");
 276                 rc = PTR_ERR(ecryptfs_inode);
 277                 goto out;
 278         }
 279         /* At this point, a file exists on "disk"; we need to make sure
 280          * that this on disk file is prepared to be an ecryptfs file */
 281         rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
 282         if (rc) {
 283                 ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
 284                                    ecryptfs_inode);
 285                 iget_failed(ecryptfs_inode);
 286                 goto out;
 287         }
 288         d_instantiate_new(ecryptfs_dentry, ecryptfs_inode);
 289 out:
 290         return rc;
 291 }
 292
 293 static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
 294 {
 295         struct ecryptfs_crypt_stat *crypt_stat;
 296         int rc;
 297
 298         rc = ecryptfs_get_lower_file(dentry, inode);
 299         if (rc) {
 300                 printk(KERN_ERR "%s: Error attempting to initialize "
 301                         "the lower file for the dentry with name "
 302                         "[%pd]; rc = [%d]\n", __func__,
 303                         dentry, rc);
 304                 return rc;
 305         }
 306
 307         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 308         /* TODO: lock for crypt_stat comparison */
 309         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
 310                 ecryptfs_set_default_sizes(crypt_stat);
 311
 312         rc = ecryptfs_read_and_validate_header_region(inode);
 313         ecryptfs_put_lower_file(inode);
 314         if (rc) {
 315                 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
 316                 if (!rc)
 317                         crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
 318         }
 319
 320         /* Must return 0 to allow non-eCryptfs files to be looked up, too */
 321         return 0;
 322 }
 323
 324 /*
 325  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
 326  */
 327 static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry,
 328                                      struct dentry *lower_dentry)
 329 {
 330         const struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent);
 331         struct inode *inode, *lower_inode;
 332         struct ecryptfs_dentry_info *dentry_info;
 333         int rc = 0;
 334
 335         dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
 336         if (!dentry_info) {
 337                 dput(lower_dentry);
 338                 return ERR_PTR(-ENOMEM);
 339         }
 340
 341         fsstack_copy_attr_atime(d_inode(dentry->d_parent),
 342                                 d_inode(path->dentry));
 343         BUG_ON(!d_count(lower_dentry));
 344
 345         ecryptfs_set_dentry_private(dentry, dentry_info);
 346         dentry_info->lower_path.mnt = mntget(path->mnt);
 347         dentry_info->lower_path.dentry = lower_dentry;
 348
 349         /*
 350          * negative dentry can go positive under us here - its parent is not
 351          * locked.  That's OK and that could happen just as we return from
 352          * ecryptfs_lookup() anyway.  Just need to be careful and fetch
 353          * ->d_inode only once - it's not stable here.
 354          */
 355         lower_inode = READ_ONCE(lower_dentry->d_inode);
 356
 357         if (!lower_inode) {
 358                 /* We want to add because we couldn't find in lower */
 359                 d_add(dentry, NULL);
 360                 return NULL;
 361         }
 362         inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb);
 363         if (IS_ERR(inode)) {
 364                 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
 365                        __func__, PTR_ERR(inode));
 366                 return ERR_CAST(inode);
 367         }
 368         if (S_ISREG(inode->i_mode)) {
 369                 rc = ecryptfs_i_size_read(dentry, inode);
 370                 if (rc) {
 371                         make_bad_inode(inode);
 372                         return ERR_PTR(rc);
 373                 }
 374         }
 375
 376         if (inode->i_state & I_NEW)
 377                 unlock_new_inode(inode);
 378         return d_splice_alias(inode, dentry);
 379 }
 380
 381 /**
 382  * ecryptfs_lookup
 383  * @ecryptfs_dir_inode: The eCryptfs directory inode
 384  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 385  * @flags: lookup flags
 386  *
 387  * Find a file on disk. If the file does not exist, then we'll add it to the
 388  * dentry cache and continue on to read it from the disk.
 389  */
 390 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 391                                       struct dentry *ecryptfs_dentry,
 392                                       unsigned int flags)
 393 {
 394         char *encrypted_and_encoded_name = NULL;
 395         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 396         struct dentry *lower_dir_dentry, *lower_dentry;
 397         const char *name = ecryptfs_dentry->d_name.name;
 398         size_t len = ecryptfs_dentry->d_name.len;
 399         struct dentry *res;
 400         int rc = 0;
 401
 402         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
 403
 404         mount_crypt_stat = &ecryptfs_superblock_to_private(
 405                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
 406         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
 407                 rc = ecryptfs_encrypt_and_encode_filename(
 408                         &encrypted_and_encoded_name, &len,
 409                         mount_crypt_stat, name, len);
 410                 if (rc) {
 411                         printk(KERN_ERR "%s: Error attempting to encrypt and encode "
 412                                "filename; rc = [%d]\n", __func__, rc);
 413                         return ERR_PTR(rc);
 414                 }
 415                 name = encrypted_and_encoded_name;
 416         }
 417
 418         lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len);
 419         if (IS_ERR(lower_dentry)) {
 420                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
 421                                 "[%ld] on lower_dentry = [%s]\n", __func__,
 422                                 PTR_ERR(lower_dentry),
 423                                 name);
 424                 res = ERR_CAST(lower_dentry);
 425         } else {
 426                 res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry);
 427         }
 428         kfree(encrypted_and_encoded_name);
 429         return res;
 430 }
 431
 432 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 433                          struct dentry *new_dentry)
 434 {
 435         struct dentry *lower_old_dentry;
 436         struct dentry *lower_new_dentry;
 437         struct inode *lower_dir;
 438         u64 file_size_save;
 439         int rc;
 440
 441         file_size_save = i_size_read(d_inode(old_dentry));
 442         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 443         rc = lock_parent(new_dentry, &lower_new_dentry, &lower_dir);
 444         if (!rc)
 445                 rc = vfs_link(lower_old_dentry, &nop_mnt_idmap, lower_dir,
 446                               lower_new_dentry, NULL);
 447         if (rc || d_really_is_negative(lower_new_dentry))
 448                 goto out_lock;
 449         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
 450         if (rc)
 451                 goto out_lock;
 452         fsstack_copy_attr_times(dir, lower_dir);
 453         fsstack_copy_inode_size(dir, lower_dir);
 454         set_nlink(d_inode(old_dentry),
 455                   ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink);
 456         i_size_write(d_inode(new_dentry), file_size_save);
 457 out_lock:
 458         inode_unlock(lower_dir);
 459         return rc;
 460 }
 461
 462 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 463 {
 464         return ecryptfs_do_unlink(dir, dentry, d_inode(dentry));
 465 }
 466
 467 static int ecryptfs_symlink(struct mnt_idmap *idmap,
 468                             struct inode *dir, struct dentry *dentry,
 469                             const char *symname)
 470 {
 471         int rc;
 472         struct dentry *lower_dentry;
 473         struct inode *lower_dir;
 474         char *encoded_symname;
 475         size_t encoded_symlen;
 476         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
 477
 478         rc = lock_parent(dentry, &lower_dentry, &lower_dir);
 479         if (rc)
 480                 goto out_lock;
 481         mount_crypt_stat = &ecryptfs_superblock_to_private(
 482                 dir->i_sb)->mount_crypt_stat;
 483         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
 484                                                   &encoded_symlen,
 485                                                   mount_crypt_stat, symname,
 486                                                   strlen(symname));
 487         if (rc)
 488                 goto out_lock;
 489         rc = vfs_symlink(&nop_mnt_idmap, lower_dir, lower_dentry,
 490                          encoded_symname);
 491         kfree(encoded_symname);
 492         if (rc || d_really_is_negative(lower_dentry))
 493                 goto out_lock;
 494         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 495         if (rc)
 496                 goto out_lock;
 497         fsstack_copy_attr_times(dir, lower_dir);
 498         fsstack_copy_inode_size(dir, lower_dir);
 499 out_lock:
 500         inode_unlock(lower_dir);
 501         if (d_really_is_negative(dentry))
 502                 d_drop(dentry);
 503         return rc;
 504 }
 505
 506 static int ecryptfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 507                           struct dentry *dentry, umode_t mode)
 508 {
 509         int rc;
 510         struct dentry *lower_dentry;
 511         struct inode *lower_dir;
 512
 513         rc = lock_parent(dentry, &lower_dentry, &lower_dir);
 514         if (!rc)
 515                 rc = vfs_mkdir(&nop_mnt_idmap, lower_dir,
 516                                lower_dentry, mode);
 517         if (rc || d_really_is_negative(lower_dentry))
 518                 goto out;
 519         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 520         if (rc)
 521                 goto out;
 522         fsstack_copy_attr_times(dir, lower_dir);
 523         fsstack_copy_inode_size(dir, lower_dir);
 524         set_nlink(dir, lower_dir->i_nlink);
 525 out:
 526         inode_unlock(lower_dir);
 527         if (d_really_is_negative(dentry))
 528                 d_drop(dentry);
 529         return rc;
 530 }
 531
 532 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 533 {
 534         struct dentry *lower_dentry;
 535         struct inode *lower_dir;
 536         int rc;
 537
 538         rc = lock_parent(dentry, &lower_dentry, &lower_dir);
 539         dget(lower_dentry);     // don't even try to make the lower negative
 540         if (!rc) {
 541                 if (d_unhashed(lower_dentry))
 542                         rc = -EINVAL;
 543                 else
 544                         rc = vfs_rmdir(&nop_mnt_idmap, lower_dir, lower_dentry);
 545         }
 546         if (!rc) {
 547                 clear_nlink(d_inode(dentry));
 548                 fsstack_copy_attr_times(dir, lower_dir);
 549                 set_nlink(dir, lower_dir->i_nlink);
 550         }
 551         dput(lower_dentry);
 552         inode_unlock(lower_dir);
 553         if (!rc)
 554                 d_drop(dentry);
 555         return rc;
 556 }
 557
 558 static int
 559 ecryptfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
 560                struct dentry *dentry, umode_t mode, dev_t dev)
 561 {
 562         int rc;
 563         struct dentry *lower_dentry;
 564         struct inode *lower_dir;
 565
 566         rc = lock_parent(dentry, &lower_dentry, &lower_dir);
 567         if (!rc)
 568                 rc = vfs_mknod(&nop_mnt_idmap, lower_dir,
 569                                lower_dentry, mode, dev);
 570         if (rc || d_really_is_negative(lower_dentry))
 571                 goto out;
 572         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
 573         if (rc)
 574                 goto out;
 575         fsstack_copy_attr_times(dir, lower_dir);
 576         fsstack_copy_inode_size(dir, lower_dir);
 577 out:
 578         inode_unlock(lower_dir);
 579         if (d_really_is_negative(dentry))
 580                 d_drop(dentry);
 581         return rc;
 582 }
 583
 584 static int
 585 ecryptfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 586                 struct dentry *old_dentry, struct inode *new_dir,
 587                 struct dentry *new_dentry, unsigned int flags)
 588 {
 589         int rc;
 590         struct dentry *lower_old_dentry;
 591         struct dentry *lower_new_dentry;
 592         struct dentry *lower_old_dir_dentry;
 593         struct dentry *lower_new_dir_dentry;
 594         struct dentry *trap;
 595         struct inode *target_inode;
 596         struct renamedata rd = {};
 597
 598         if (flags)
 599                 return -EINVAL;
 600
 601         lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent);
 602         lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent);
 603
 604         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
 605         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
 606
 607         target_inode = d_inode(new_dentry);
 608
 609         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 610         if (IS_ERR(trap))
 611                 return PTR_ERR(trap);
 612         dget(lower_new_dentry);
 613         rc = -EINVAL;
 614         if (lower_old_dentry->d_parent != lower_old_dir_dentry)
 615                 goto out_lock;
 616         if (lower_new_dentry->d_parent != lower_new_dir_dentry)
 617                 goto out_lock;
 618         if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry))
 619                 goto out_lock;
 620         /* source should not be ancestor of target */
 621         if (trap == lower_old_dentry)
 622                 goto out_lock;
 623         /* target should not be ancestor of source */
 624         if (trap == lower_new_dentry) {
 625                 rc = -ENOTEMPTY;
 626                 goto out_lock;
 627         }
 628
 629         rd.old_mnt_idmap        = &nop_mnt_idmap;
 630         rd.old_dir              = d_inode(lower_old_dir_dentry);
 631         rd.old_dentry           = lower_old_dentry;
 632         rd.new_mnt_idmap        = &nop_mnt_idmap;
 633         rd.new_dir              = d_inode(lower_new_dir_dentry);
 634         rd.new_dentry           = lower_new_dentry;
 635         rc = vfs_rename(&rd);
 636         if (rc)
 637                 goto out_lock;
 638         if (target_inode)
 639                 fsstack_copy_attr_all(target_inode,
 640                                       ecryptfs_inode_to_lower(target_inode));
 641         fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry));
 642         if (new_dir != old_dir)
 643                 fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry));
 644 out_lock:
 645         dput(lower_new_dentry);
 646         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
 647         return rc;
 648 }
 649
 650 static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz)
 651 {
 652         DEFINE_DELAYED_CALL(done);
 653         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 654         const char *link;
 655         char *buf;
 656         int rc;
 657
 658         link = vfs_get_link(lower_dentry, &done);
 659         if (IS_ERR(link))
 660                 return ERR_CAST(link);
 661
 662         rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb,
 663                                                   link, strlen(link));
 664         do_delayed_call(&done);
 665         if (rc)
 666                 return ERR_PTR(rc);
 667
 668         return buf;
 669 }
 670
 671 static const char *ecryptfs_get_link(struct dentry *dentry,
 672                                      struct inode *inode,
 673                                      struct delayed_call *done)
 674 {
 675         size_t len;
 676         char *buf;
 677
 678         if (!dentry)
 679                 return ERR_PTR(-ECHILD);
 680
 681         buf = ecryptfs_readlink_lower(dentry, &len);
 682         if (IS_ERR(buf))
 683                 return buf;
 684         fsstack_copy_attr_atime(d_inode(dentry),
 685                                 d_inode(ecryptfs_dentry_to_lower(dentry)));
 686         buf[len] = '\0';
 687         set_delayed_call(done, kfree_link, buf);
 688         return buf;
 689 }
 690
 691 /**
 692  * upper_size_to_lower_size
 693  * @crypt_stat: Crypt_stat associated with file
 694  * @upper_size: Size of the upper file
 695  *
 696  * Calculate the required size of the lower file based on the
 697  * specified size of the upper file. This calculation is based on the
 698  * number of headers in the underlying file and the extent size.
 699  *
 700  * Returns Calculated size of the lower file.
 701  */
 702 static loff_t
 703 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 704                          loff_t upper_size)
 705 {
 706         loff_t lower_size;
 707
 708         lower_size = ecryptfs_lower_header_size(crypt_stat);
 709         if (upper_size != 0) {
 710                 loff_t num_extents;
 711
 712                 num_extents = upper_size >> crypt_stat->extent_shift;
 713                 if (upper_size & ~crypt_stat->extent_mask)
 714                         num_extents++;
 715                 lower_size += (num_extents * crypt_stat->extent_size);
 716         }
 717         return lower_size;
 718 }
 719
 720 /**
 721  * truncate_upper
 722  * @dentry: The ecryptfs layer dentry
 723  * @ia: Address of the ecryptfs inode's attributes
 724  * @lower_ia: Address of the lower inode's attributes
 725  *
 726  * Function to handle truncations modifying the size of the file. Note
 727  * that the file sizes are interpolated. When expanding, we are simply
 728  * writing strings of 0's out. When truncating, we truncate the upper
 729  * inode and update the lower_ia according to the page index
 730  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
 731  * the caller must use lower_ia in a call to notify_change() to perform
 732  * the truncation of the lower inode.
 733  *
 734  * Returns zero on success; non-zero otherwise
 735  */
 736 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
 737                           struct iattr *lower_ia)
 738 {
 739         int rc = 0;
 740         struct inode *inode = d_inode(dentry);
 741         struct ecryptfs_crypt_stat *crypt_stat;
 742         loff_t i_size = i_size_read(inode);
 743         loff_t lower_size_before_truncate;
 744         loff_t lower_size_after_truncate;
 745
 746         if (unlikely((ia->ia_size == i_size))) {
 747                 lower_ia->ia_valid &= ~ATTR_SIZE;
 748                 return 0;
 749         }
 750         rc = ecryptfs_get_lower_file(dentry, inode);
 751         if (rc)
 752                 return rc;
 753         crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
 754         /* Switch on growing or shrinking file */
 755         if (ia->ia_size > i_size) {
 756                 char zero[] = { 0x00 };
 757
 758                 lower_ia->ia_valid &= ~ATTR_SIZE;
 759                 /* Write a single 0 at the last position of the file;
 760                  * this triggers code that will fill in 0's throughout
 761                  * the intermediate portion of the previous end of the
 762                  * file and the new and of the file */
 763                 rc = ecryptfs_write(inode, zero,
 764                                     (ia->ia_size - 1), 1);
 765         } else { /* ia->ia_size < i_size_read(inode) */
 766                 /* We're chopping off all the pages down to the page
 767                  * in which ia->ia_size is located. Fill in the end of
 768                  * that page from (ia->ia_size & ~PAGE_MASK) to
 769                  * PAGE_SIZE with zeros. */
 770                 size_t num_zeros = (PAGE_SIZE
 771                                     - (ia->ia_size & ~PAGE_MASK));
 772
 773                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
 774                         truncate_setsize(inode, ia->ia_size);
 775                         lower_ia->ia_size = ia->ia_size;
 776                         lower_ia->ia_valid |= ATTR_SIZE;
 777                         goto out;
 778                 }
 779                 if (num_zeros) {
 780                         char *zeros_virt;
 781
 782                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
 783                         if (!zeros_virt) {
 784                                 rc = -ENOMEM;
 785                                 goto out;
 786                         }
 787                         rc = ecryptfs_write(inode, zeros_virt,
 788                                             ia->ia_size, num_zeros);
 789                         kfree(zeros_virt);
 790                         if (rc) {
 791                                 printk(KERN_ERR "Error attempting to zero out "
 792                                        "the remainder of the end page on "
 793                                        "reducing truncate; rc = [%d]\n", rc);
 794                                 goto out;
 795                         }
 796                 }
 797                 truncate_setsize(inode, ia->ia_size);
 798                 rc = ecryptfs_write_inode_size_to_metadata(inode);
 799                 if (rc) {
 800                         printk(KERN_ERR "Problem with "
 801                                "ecryptfs_write_inode_size_to_metadata; "
 802                                "rc = [%d]\n", rc);
 803                         goto out;
 804                 }
 805                 /* We are reducing the size of the ecryptfs file, and need to
 806                  * know if we need to reduce the size of the lower file. */
 807                 lower_size_before_truncate =
 808                     upper_size_to_lower_size(crypt_stat, i_size);
 809                 lower_size_after_truncate =
 810                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
 811                 if (lower_size_after_truncate < lower_size_before_truncate) {
 812                         lower_ia->ia_size = lower_size_after_truncate;
 813                         lower_ia->ia_valid |= ATTR_SIZE;
 814                 } else
 815                         lower_ia->ia_valid &= ~ATTR_SIZE;
 816         }
 817 out:
 818         ecryptfs_put_lower_file(inode);
 819         return rc;
 820 }
 821
 822 static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
 823 {
 824         struct ecryptfs_crypt_stat *crypt_stat;
 825         loff_t lower_oldsize, lower_newsize;
 826
 827         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 828         lower_oldsize = upper_size_to_lower_size(crypt_stat,
 829                                                  i_size_read(inode));
 830         lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
 831         if (lower_newsize > lower_oldsize) {
 832                 /*
 833                  * The eCryptfs inode and the new *lower* size are mixed here
 834                  * because we may not have the lower i_mutex held and/or it may
 835                  * not be appropriate to call inode_newsize_ok() with inodes
 836                  * from other filesystems.
 837                  */
 838                 return inode_newsize_ok(inode, lower_newsize);
 839         }
 840
 841         return 0;
 842 }
 843
 844 /**
 845  * ecryptfs_truncate
 846  * @dentry: The ecryptfs layer dentry
 847  * @new_length: The length to expand the file to
 848  *
 849  * Simple function that handles the truncation of an eCryptfs inode and
 850  * its corresponding lower inode.
 851  *
 852  * Returns zero on success; non-zero otherwise
 853  */
 854 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 855 {
 856         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
 857         struct iattr lower_ia = { .ia_valid = 0 };
 858         int rc;
 859
 860         rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length);
 861         if (rc)
 862                 return rc;
 863
 864         rc = truncate_upper(dentry, &ia, &lower_ia);
 865         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
 866                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 867
 868                 inode_lock(d_inode(lower_dentry));
 869                 rc = notify_change(&nop_mnt_idmap, lower_dentry,
 870                                    &lower_ia, NULL);
 871                 inode_unlock(d_inode(lower_dentry));
 872         }
 873         return rc;
 874 }
 875
 876 static int
 877 ecryptfs_permission(struct mnt_idmap *idmap, struct inode *inode,
 878                     int mask)
 879 {
 880         return inode_permission(&nop_mnt_idmap,
 881                                 ecryptfs_inode_to_lower(inode), mask);
 882 }
 883
 884 /**
 885  * ecryptfs_setattr
 886  * @idmap: idmap of the target mount
 887  * @dentry: dentry handle to the inode to modify
 888  * @ia: Structure with flags of what to change and values
 889  *
 890  * Updates the metadata of an inode. If the update is to the size
 891  * i.e. truncation, then ecryptfs_truncate will handle the size modification
 892  * of both the ecryptfs inode and the lower inode.
 893  *
 894  * All other metadata changes will be passed right to the lower filesystem,
 895  * and we will just update our inode to look like the lower.
 896  */
 897 static int ecryptfs_setattr(struct mnt_idmap *idmap,
 898                             struct dentry *dentry, struct iattr *ia)
 899 {
 900         int rc = 0;
 901         struct dentry *lower_dentry;
 902         struct iattr lower_ia;
 903         struct inode *inode;
 904         struct inode *lower_inode;
 905         struct ecryptfs_crypt_stat *crypt_stat;
 906
 907         crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
 908         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) {
 909                 rc = ecryptfs_init_crypt_stat(crypt_stat);
 910                 if (rc)
 911                         return rc;
 912         }
 913         inode = d_inode(dentry);
 914         lower_inode = ecryptfs_inode_to_lower(inode);
 915         lower_dentry = ecryptfs_dentry_to_lower(dentry);
 916         mutex_lock(&crypt_stat->cs_mutex);
 917         if (d_is_dir(dentry))
 918                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
 919         else if (d_is_reg(dentry)
 920                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
 921                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
 922                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 923
 924                 mount_crypt_stat = &ecryptfs_superblock_to_private(
 925                         dentry->d_sb)->mount_crypt_stat;
 926                 rc = ecryptfs_get_lower_file(dentry, inode);
 927                 if (rc) {
 928                         mutex_unlock(&crypt_stat->cs_mutex);
 929                         goto out;
 930                 }
 931                 rc = ecryptfs_read_metadata(dentry);
 932                 ecryptfs_put_lower_file(inode);
 933                 if (rc) {
 934                         if (!(mount_crypt_stat->flags
 935                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
 936                                 rc = -EIO;
 937                                 printk(KERN_WARNING "Either the lower file "
 938                                        "is not in a valid eCryptfs format, "
 939                                        "or the key could not be retrieved. "
 940                                        "Plaintext passthrough mode is not "
 941                                        "enabled; returning -EIO\n");
 942                                 mutex_unlock(&crypt_stat->cs_mutex);
 943                                 goto out;
 944                         }
 945                         rc = 0;
 946                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
 947                                                | ECRYPTFS_ENCRYPTED);
 948                 }
 949         }
 950         mutex_unlock(&crypt_stat->cs_mutex);
 951
 952         rc = setattr_prepare(&nop_mnt_idmap, dentry, ia);
 953         if (rc)
 954                 goto out;
 955         if (ia->ia_valid & ATTR_SIZE) {
 956                 rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
 957                 if (rc)
 958                         goto out;
 959         }
 960
 961         memcpy(&lower_ia, ia, sizeof(lower_ia));
 962         if (ia->ia_valid & ATTR_FILE)
 963                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
 964         if (ia->ia_valid & ATTR_SIZE) {
 965                 rc = truncate_upper(dentry, ia, &lower_ia);
 966                 if (rc < 0)
 967                         goto out;
 968         }
 969
 970         /*
 971          * mode change is for clearing setuid/setgid bits. Allow lower fs
 972          * to interpret this in its own way.
 973          */
 974         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
 975                 lower_ia.ia_valid &= ~ATTR_MODE;
 976
 977         inode_lock(d_inode(lower_dentry));
 978         rc = notify_change(&nop_mnt_idmap, lower_dentry, &lower_ia, NULL);
 979         inode_unlock(d_inode(lower_dentry));
 980 out:
 981         fsstack_copy_attr_all(inode, lower_inode);
 982         return rc;
 983 }
 984
 985 static int ecryptfs_getattr_link(struct mnt_idmap *idmap,
 986                                  const struct path *path, struct kstat *stat,
 987                                  u32 request_mask, unsigned int flags)
 988 {
 989         struct dentry *dentry = path->dentry;
 990         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
 991         int rc = 0;
 992
 993         mount_crypt_stat = &ecryptfs_superblock_to_private(
 994                                                 dentry->d_sb)->mount_crypt_stat;
 995         generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
 996         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
 997                 char *target;
 998                 size_t targetsiz;
 999
1000                 target = ecryptfs_readlink_lower(dentry, &targetsiz);
1001                 if (!IS_ERR(target)) {
1002                         kfree(target);
1003                         stat->size = targetsiz;
1004                 } else {
1005                         rc = PTR_ERR(target);
1006                 }
1007         }
1008         return rc;
1009 }
1010
1011 static int ecryptfs_getattr(struct mnt_idmap *idmap,
1012                             const struct path *path, struct kstat *stat,
1013                             u32 request_mask, unsigned int flags)
1014 {
1015         struct dentry *dentry = path->dentry;
1016         struct kstat lower_stat;
1017         int rc;
1018
1019         rc = vfs_getattr_nosec(ecryptfs_dentry_to_lower_path(dentry),
1020                                &lower_stat, request_mask, flags);
1021         if (!rc) {
1022                 fsstack_copy_attr_all(d_inode(dentry),
1023                                       ecryptfs_inode_to_lower(d_inode(dentry)));
1024                 generic_fillattr(&nop_mnt_idmap, request_mask,
1025                                  d_inode(dentry), stat);
1026                 stat->blocks = lower_stat.blocks;
1027         }
1028         return rc;
1029 }
1030
1031 int
1032 ecryptfs_setxattr(struct dentry *dentry, struct inode *inode,
1033                   const char *name, const void *value,
1034                   size_t size, int flags)
1035 {
1036         int rc;
1037         struct dentry *lower_dentry;
1038         struct inode *lower_inode;
1039
1040         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1041         lower_inode = d_inode(lower_dentry);
1042         if (!(lower_inode->i_opflags & IOP_XATTR)) {
1043                 rc = -EOPNOTSUPP;
1044                 goto out;
1045         }
1046         inode_lock(lower_inode);
1047         rc = __vfs_setxattr_locked(&nop_mnt_idmap, lower_dentry, name, value, size, flags, NULL);
1048         inode_unlock(lower_inode);
1049         if (!rc && inode)
1050                 fsstack_copy_attr_all(inode, lower_inode);
1051 out:
1052         return rc;
1053 }
1054
1055 ssize_t
1056 ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode,
1057                         const char *name, void *value, size_t size)
1058 {
1059         int rc;
1060
1061         if (!(lower_inode->i_opflags & IOP_XATTR)) {
1062                 rc = -EOPNOTSUPP;
1063                 goto out;
1064         }
1065         inode_lock(lower_inode);
1066         rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size);
1067         inode_unlock(lower_inode);
1068 out:
1069         return rc;
1070 }
1071
1072 static ssize_t
1073 ecryptfs_getxattr(struct dentry *dentry, struct inode *inode,
1074                   const char *name, void *value, size_t size)
1075 {
1076         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
1077                                        ecryptfs_inode_to_lower(inode),
1078                                        name, value, size);
1079 }
1080
1081 static ssize_t
1082 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1083 {
1084         int rc = 0;
1085         struct dentry *lower_dentry;
1086
1087         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1088         if (!d_inode(lower_dentry)->i_op->listxattr) {
1089                 rc = -EOPNOTSUPP;
1090                 goto out;
1091         }
1092         inode_lock(d_inode(lower_dentry));
1093         rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size);
1094         inode_unlock(d_inode(lower_dentry));
1095 out:
1096         return rc;
1097 }
1098
1099 static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode,
1100                                 const char *name)
1101 {
1102         int rc;
1103         struct dentry *lower_dentry;
1104         struct inode *lower_inode;
1105
1106         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1107         lower_inode = ecryptfs_inode_to_lower(inode);
1108         if (!(lower_inode->i_opflags & IOP_XATTR)) {
1109                 rc = -EOPNOTSUPP;
1110                 goto out;
1111         }
1112         inode_lock(lower_inode);
1113         rc = __vfs_removexattr(&nop_mnt_idmap, lower_dentry, name);
1114         inode_unlock(lower_inode);
1115 out:
1116         return rc;
1117 }
1118
1119 static int ecryptfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
1120 {
1121         return vfs_fileattr_get(ecryptfs_dentry_to_lower(dentry), fa);
1122 }
1123
1124 static int ecryptfs_fileattr_set(struct mnt_idmap *idmap,
1125                                  struct dentry *dentry, struct fileattr *fa)
1126 {
1127         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
1128         int rc;
1129
1130         rc = vfs_fileattr_set(&nop_mnt_idmap, lower_dentry, fa);
1131         fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry));
1132
1133         return rc;
1134 }
1135
1136 static struct posix_acl *ecryptfs_get_acl(struct mnt_idmap *idmap,
1137                                           struct dentry *dentry, int type)
1138 {
1139         return vfs_get_acl(idmap, ecryptfs_dentry_to_lower(dentry),
1140                            posix_acl_xattr_name(type));
1141 }
1142
1143 static int ecryptfs_set_acl(struct mnt_idmap *idmap,
1144                             struct dentry *dentry, struct posix_acl *acl,
1145                             int type)
1146 {
1147         int rc;
1148         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
1149         struct inode *lower_inode = d_inode(lower_dentry);
1150
1151         rc = vfs_set_acl(&nop_mnt_idmap, lower_dentry,
1152                          posix_acl_xattr_name(type), acl);
1153         if (!rc)
1154                 fsstack_copy_attr_all(d_inode(dentry), lower_inode);
1155         return rc;
1156 }
1157
1158 const struct inode_operations ecryptfs_symlink_iops = {
1159         .get_link = ecryptfs_get_link,
1160         .permission = ecryptfs_permission,
1161         .setattr = ecryptfs_setattr,
1162         .getattr = ecryptfs_getattr_link,
1163         .listxattr = ecryptfs_listxattr,
1164 };
1165
1166 const struct inode_operations ecryptfs_dir_iops = {
1167         .create = ecryptfs_create,
1168         .lookup = ecryptfs_lookup,
1169         .link = ecryptfs_link,
1170         .unlink = ecryptfs_unlink,
1171         .symlink = ecryptfs_symlink,
1172         .mkdir = ecryptfs_mkdir,
1173         .rmdir = ecryptfs_rmdir,
1174         .mknod = ecryptfs_mknod,
1175         .rename = ecryptfs_rename,
1176         .permission = ecryptfs_permission,
1177         .setattr = ecryptfs_setattr,
1178         .listxattr = ecryptfs_listxattr,
1179         .fileattr_get = ecryptfs_fileattr_get,
1180         .fileattr_set = ecryptfs_fileattr_set,
1181         .get_acl = ecryptfs_get_acl,
1182         .set_acl = ecryptfs_set_acl,
1183 };
1184
1185 const struct inode_operations ecryptfs_main_iops = {
1186         .permission = ecryptfs_permission,
1187         .setattr = ecryptfs_setattr,
1188         .getattr = ecryptfs_getattr,
1189         .listxattr = ecryptfs_listxattr,
1190         .fileattr_get = ecryptfs_fileattr_get,
1191         .fileattr_set = ecryptfs_fileattr_set,
1192         .get_acl = ecryptfs_get_acl,
1193         .set_acl = ecryptfs_set_acl,
1194 };
1195
1196 static int ecryptfs_xattr_get(const struct xattr_handler *handler,
1197                               struct dentry *dentry, struct inode *inode,
1198                               const char *name, void *buffer, size_t size)
1199 {
1200         return ecryptfs_getxattr(dentry, inode, name, buffer, size);
1201 }
1202
1203 static int ecryptfs_xattr_set(const struct xattr_handler *handler,
1204                               struct mnt_idmap *idmap,
1205                               struct dentry *dentry, struct inode *inode,
1206                               const char *name, const void *value, size_t size,
1207                               int flags)
1208 {
1209         if (value)
1210                 return ecryptfs_setxattr(dentry, inode, name, value, size, flags);
1211         else {
1212                 BUG_ON(flags != XATTR_REPLACE);
1213                 return ecryptfs_removexattr(dentry, inode, name);
1214         }
1215 }
1216
1217 static const struct xattr_handler ecryptfs_xattr_handler = {
1218         .prefix = "",  /* match anything */
1219         .get = ecryptfs_xattr_get,
1220         .set = ecryptfs_xattr_set,
1221 };
1222
1223 const struct xattr_handler * const ecryptfs_xattr_handlers[] = {
1224         &ecryptfs_xattr_handler,
1225         NULL
1226 };