2 * eCryptfs: Linux filesystem encryption layer
4 * Copyright (C) 1997-2003 Erez Zadok
5 * Copyright (C) 2001-2003 Stony Brook University
6 * Copyright (C) 2004-2006 International Business Machines Corp.
7 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
8 * Michael C. Thompson <mcthomps@us.ibm.com>
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.
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.
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
26 #include <linux/dcache.h>
27 #include <linux/file.h>
28 #include <linux/module.h>
29 #include <linux/namei.h>
30 #include <linux/skbuff.h>
31 #include <linux/crypto.h>
32 #include <linux/netlink.h>
33 #include <linux/mount.h>
34 #include <linux/dcache.h>
35 #include <linux/pagemap.h>
36 #include <linux/key.h>
37 #include <linux/parser.h>
38 #include "ecryptfs_kernel.h"
41 * Module parameter that defines the ecryptfs_verbosity level.
43 int ecryptfs_verbosity = 0;
45 module_param(ecryptfs_verbosity, int, 0);
46 MODULE_PARM_DESC(ecryptfs_verbosity,
47 "Initial verbosity level (0 or 1; defaults to "
48 "0, which is Quiet)");
50 void __ecryptfs_printk(const char *fmt, ...)
54 if (fmt[1] == '7') { /* KERN_DEBUG */
55 if (ecryptfs_verbosity >= 1)
64 * @lower_dentry: Existing dentry in the lower filesystem
65 * @dentry: ecryptfs' dentry
66 * @sb: ecryptfs's super_block
67 * @flag: If set to true, then d_add is called, else d_instantiate is called
69 * Interposes upper and lower dentries.
71 * Returns zero on success; non-zero otherwise
73 int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
74 struct super_block *sb, int flag)
76 struct inode *lower_inode;
80 lower_inode = lower_dentry->d_inode;
81 if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) {
85 if (!igrab(lower_inode)) {
89 inode = iget5_locked(sb, (unsigned long)lower_inode,
90 ecryptfs_inode_test, ecryptfs_inode_set,
97 if (inode->i_state & I_NEW)
98 unlock_new_inode(inode);
101 if (S_ISLNK(lower_inode->i_mode))
102 inode->i_op = &ecryptfs_symlink_iops;
103 else if (S_ISDIR(lower_inode->i_mode))
104 inode->i_op = &ecryptfs_dir_iops;
105 if (S_ISDIR(lower_inode->i_mode))
106 inode->i_fop = &ecryptfs_dir_fops;
107 if (special_file(lower_inode->i_mode))
108 init_special_inode(inode, lower_inode->i_mode,
109 lower_inode->i_rdev);
110 dentry->d_op = &ecryptfs_dops;
112 d_add(dentry, inode);
114 d_instantiate(dentry, inode);
115 ecryptfs_copy_attr_all(inode, lower_inode);
116 /* This size will be overwritten for real files w/ headers and
118 ecryptfs_copy_inode_size(inode, lower_inode);
123 enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig, ecryptfs_opt_debug,
124 ecryptfs_opt_ecryptfs_debug, ecryptfs_opt_cipher,
125 ecryptfs_opt_ecryptfs_cipher, ecryptfs_opt_ecryptfs_key_bytes,
126 ecryptfs_opt_passthrough, ecryptfs_opt_err };
128 static match_table_t tokens = {
129 {ecryptfs_opt_sig, "sig=%s"},
130 {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"},
131 {ecryptfs_opt_debug, "debug=%u"},
132 {ecryptfs_opt_ecryptfs_debug, "ecryptfs_debug=%u"},
133 {ecryptfs_opt_cipher, "cipher=%s"},
134 {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"},
135 {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"},
136 {ecryptfs_opt_passthrough, "ecryptfs_passthrough"},
137 {ecryptfs_opt_err, NULL}
141 * ecryptfs_verify_version
142 * @version: The version number to confirm
144 * Returns zero on good version; non-zero otherwise
146 static int ecryptfs_verify_version(u16 version)
152 major = ((version >> 8) & 0xFF);
153 minor = (version & 0xFF);
154 if (major != ECRYPTFS_VERSION_MAJOR) {
155 ecryptfs_printk(KERN_ERR, "Major version number mismatch. "
156 "Expected [%d]; got [%d]\n",
157 ECRYPTFS_VERSION_MAJOR, major);
161 if (minor != ECRYPTFS_VERSION_MINOR) {
162 ecryptfs_printk(KERN_ERR, "Minor version number mismatch. "
163 "Expected [%d]; got [%d]\n",
164 ECRYPTFS_VERSION_MINOR, minor);
173 * ecryptfs_parse_options
174 * @sb: The ecryptfs super block
175 * @options: The options pased to the kernel
177 * Parse mount options:
178 * debug=N - ecryptfs_verbosity level for debug output
179 * sig=XXX - description(signature) of the key to use
181 * Returns the dentry object of the lower-level (lower/interposed)
182 * directory; We want to mount our stackable file system on top of
183 * that lower directory.
185 * The signature of the key to use must be the description of a key
186 * already in the keyring. Mounting will fail if the key can not be
189 * Returns zero on success; non-zero on error
191 static int ecryptfs_parse_options(struct super_block *sb, char *options)
196 int cipher_name_set = 0;
197 int cipher_key_bytes;
198 int cipher_key_bytes_set = 0;
199 struct key *auth_tok_key = NULL;
200 struct ecryptfs_auth_tok *auth_tok = NULL;
201 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
202 &ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
203 substring_t args[MAX_OPT_ARGS];
208 char *cipher_name_dst;
209 char *cipher_name_src;
210 char *cipher_key_bytes_src;
211 struct crypto_tfm *tmp_tfm;
218 while ((p = strsep(&options, ",")) != NULL) {
221 token = match_token(p, tokens, args);
223 case ecryptfs_opt_sig:
224 case ecryptfs_opt_ecryptfs_sig:
225 sig_src = args[0].from;
227 mount_crypt_stat->global_auth_tok_sig;
228 memcpy(sig_dst, sig_src, ECRYPTFS_SIG_SIZE_HEX);
229 sig_dst[ECRYPTFS_SIG_SIZE_HEX] = '\0';
230 ecryptfs_printk(KERN_DEBUG,
231 "The mount_crypt_stat "
232 "global_auth_tok_sig set to: "
236 case ecryptfs_opt_debug:
237 case ecryptfs_opt_ecryptfs_debug:
238 debug_src = args[0].from;
240 (int)simple_strtol(debug_src, &debug_src,
242 ecryptfs_printk(KERN_DEBUG,
243 "Verbosity set to [%d]" "\n",
246 case ecryptfs_opt_cipher:
247 case ecryptfs_opt_ecryptfs_cipher:
248 cipher_name_src = args[0].from;
251 global_default_cipher_name;
252 strncpy(cipher_name_dst, cipher_name_src,
253 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
254 ecryptfs_printk(KERN_DEBUG,
255 "The mount_crypt_stat "
256 "global_default_cipher_name set to: "
257 "[%s]\n", cipher_name_dst);
260 case ecryptfs_opt_ecryptfs_key_bytes:
261 cipher_key_bytes_src = args[0].from;
263 (int)simple_strtol(cipher_key_bytes_src,
264 &cipher_key_bytes_src, 0);
265 mount_crypt_stat->global_default_cipher_key_size =
267 ecryptfs_printk(KERN_DEBUG,
268 "The mount_crypt_stat "
269 "global_default_cipher_key_size "
270 "set to: [%d]\n", mount_crypt_stat->
271 global_default_cipher_key_size);
272 cipher_key_bytes_set = 1;
274 case ecryptfs_opt_passthrough:
275 mount_crypt_stat->flags |=
276 ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED;
278 case ecryptfs_opt_err:
280 ecryptfs_printk(KERN_WARNING,
281 "eCryptfs: unrecognized option '%s'\n",
285 /* Do not support lack of mount-wide signature in 0.1
289 ecryptfs_printk(KERN_ERR, "You must supply a valid "
290 "passphrase auth tok signature as a mount "
291 "parameter; see the eCryptfs README\n");
294 if (!cipher_name_set) {
295 cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
296 if (unlikely(cipher_name_len
297 >= ECRYPTFS_MAX_CIPHER_NAME_SIZE)) {
302 memcpy(mount_crypt_stat->global_default_cipher_name,
303 ECRYPTFS_DEFAULT_CIPHER, cipher_name_len);
304 mount_crypt_stat->global_default_cipher_name[cipher_name_len]
307 if (!cipher_key_bytes_set) {
308 mount_crypt_stat->global_default_cipher_key_size =
309 ECRYPTFS_DEFAULT_KEY_BYTES;
310 ecryptfs_printk(KERN_DEBUG, "Cipher key size was not "
311 "specified. Defaulting to [%d]\n",
313 global_default_cipher_key_size);
315 rc = ecryptfs_process_cipher(
317 &mount_crypt_stat->global_key_tfm,
318 mount_crypt_stat->global_default_cipher_name,
319 mount_crypt_stat->global_default_cipher_key_size);
321 crypto_free_tfm(tmp_tfm);
323 printk(KERN_ERR "Error attempting to initialize cipher [%s] "
324 "with key size [%Zd] bytes; rc = [%d]\n",
325 mount_crypt_stat->global_default_cipher_name,
326 mount_crypt_stat->global_default_cipher_key_size, rc);
330 mutex_init(&mount_crypt_stat->global_key_tfm_mutex);
331 ecryptfs_printk(KERN_DEBUG, "Requesting the key with description: "
332 "[%s]\n", mount_crypt_stat->global_auth_tok_sig);
333 /* The reference to this key is held until umount is done The
334 * call to key_put is done in ecryptfs_put_super() */
335 auth_tok_key = request_key(&key_type_user,
336 mount_crypt_stat->global_auth_tok_sig,
338 if (!auth_tok_key || IS_ERR(auth_tok_key)) {
339 ecryptfs_printk(KERN_ERR, "Could not find key with "
340 "description: [%s]\n",
341 mount_crypt_stat->global_auth_tok_sig);
342 process_request_key_err(PTR_ERR(auth_tok_key));
346 auth_tok = ecryptfs_get_key_payload_data(auth_tok_key);
347 if (ecryptfs_verify_version(auth_tok->version)) {
348 ecryptfs_printk(KERN_ERR, "Data structure version mismatch. "
349 "Userspace tools must match eCryptfs kernel "
350 "module with major version [%d] and minor "
351 "version [%d]\n", ECRYPTFS_VERSION_MAJOR,
352 ECRYPTFS_VERSION_MINOR);
356 if (auth_tok->token_type != ECRYPTFS_PASSWORD) {
357 ecryptfs_printk(KERN_ERR, "Invalid auth_tok structure "
358 "returned from key\n");
362 mount_crypt_stat->global_auth_tok_key = auth_tok_key;
363 mount_crypt_stat->global_auth_tok = auth_tok;
368 struct kmem_cache *ecryptfs_sb_info_cache;
371 * ecryptfs_fill_super
372 * @sb: The ecryptfs super block
373 * @raw_data: The options passed to mount
374 * @silent: Not used but required by function prototype
376 * Sets up what we can of the sb, rest is done in ecryptfs_read_super
378 * Returns zero on success; non-zero otherwise
381 ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
385 /* Released in ecryptfs_put_super() */
386 ecryptfs_set_superblock_private(sb,
387 kmem_cache_alloc(ecryptfs_sb_info_cache,
389 if (!ecryptfs_superblock_to_private(sb)) {
390 ecryptfs_printk(KERN_WARNING, "Out of memory\n");
394 memset(ecryptfs_superblock_to_private(sb), 0,
395 sizeof(struct ecryptfs_sb_info));
396 sb->s_op = &ecryptfs_sops;
397 /* Released through deactivate_super(sb) from get_sb_nodev */
398 sb->s_root = d_alloc(NULL, &(const struct qstr) {
399 .hash = 0,.name = "/",.len = 1});
401 ecryptfs_printk(KERN_ERR, "d_alloc failed\n");
405 sb->s_root->d_op = &ecryptfs_dops;
406 sb->s_root->d_sb = sb;
407 sb->s_root->d_parent = sb->s_root;
408 /* Released in d_release when dput(sb->s_root) is called */
409 /* through deactivate_super(sb) from get_sb_nodev() */
410 ecryptfs_set_dentry_private(sb->s_root,
411 kmem_cache_alloc(ecryptfs_dentry_info_cache,
413 if (!ecryptfs_dentry_to_private(sb->s_root)) {
414 ecryptfs_printk(KERN_ERR,
415 "dentry_info_cache alloc failed\n");
419 memset(ecryptfs_dentry_to_private(sb->s_root), 0,
420 sizeof(struct ecryptfs_dentry_info));
423 /* Should be able to rely on deactivate_super called from
429 * ecryptfs_read_super
430 * @sb: The ecryptfs super block
431 * @dev_name: The path to mount over
433 * Read the super block of the lower filesystem, and use
434 * ecryptfs_interpose to create our initial inode and super block
437 static int ecryptfs_read_super(struct super_block *sb, const char *dev_name)
441 struct dentry *lower_root;
442 struct vfsmount *lower_mnt;
444 memset(&nd, 0, sizeof(struct nameidata));
445 rc = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
447 ecryptfs_printk(KERN_WARNING, "path_lookup() failed\n");
450 lower_root = nd.dentry;
451 if (!lower_root->d_inode) {
452 ecryptfs_printk(KERN_WARNING,
453 "No directory to interpose on\n");
458 ecryptfs_set_superblock_lower(sb, lower_root->d_sb);
459 sb->s_maxbytes = lower_root->d_sb->s_maxbytes;
460 ecryptfs_set_dentry_lower(sb->s_root, lower_root);
461 ecryptfs_set_dentry_lower_mnt(sb->s_root, lower_mnt);
462 if ((rc = ecryptfs_interpose(lower_root, sb->s_root, sb, 0)))
476 * @dev_name: The path to mount over
477 * @raw_data: The options passed into the kernel
479 * The whole ecryptfs_get_sb process is broken into 4 functions:
480 * ecryptfs_parse_options(): handle options passed to ecryptfs, if any
481 * ecryptfs_fill_super(): used by get_sb_nodev, fills out the super_block
482 * with as much information as it can before needing
483 * the lower filesystem.
484 * ecryptfs_read_super(): this accesses the lower filesystem and uses
485 * ecryptfs_interpolate to perform most of the linking
486 * ecryptfs_interpolate(): links the lower filesystem into ecryptfs
488 static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
489 const char *dev_name, void *raw_data,
490 struct vfsmount *mnt)
493 struct super_block *sb;
495 rc = get_sb_nodev(fs_type, flags, raw_data, ecryptfs_fill_super, mnt);
497 printk(KERN_ERR "Getting sb failed; rc = [%d]\n", rc);
501 rc = ecryptfs_parse_options(sb, raw_data);
503 printk(KERN_ERR "Error parsing options; rc = [%d]\n", rc);
506 rc = ecryptfs_read_super(sb, dev_name);
508 printk(KERN_ERR "Reading sb failed; rc = [%d]\n", rc);
514 up_write(&sb->s_umount);
515 deactivate_super(sb);
521 * ecryptfs_kill_block_super
522 * @sb: The ecryptfs super block
524 * Used to bring the superblock down and free the private data.
525 * Private data is free'd in ecryptfs_put_super()
527 static void ecryptfs_kill_block_super(struct super_block *sb)
529 generic_shutdown_super(sb);
532 static struct file_system_type ecryptfs_fs_type = {
533 .owner = THIS_MODULE,
535 .get_sb = ecryptfs_get_sb,
536 .kill_sb = ecryptfs_kill_block_super,
541 * inode_info_init_once
543 * Initializes the ecryptfs_inode_info_cache when it is created
546 inode_info_init_once(void *vptr, struct kmem_cache *cachep, unsigned long flags)
548 struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
550 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
551 SLAB_CTOR_CONSTRUCTOR)
552 inode_init_once(&ei->vfs_inode);
555 static struct ecryptfs_cache_info {
556 kmem_cache_t **cache;
559 void (*ctor)(void*, struct kmem_cache *, unsigned long);
560 } ecryptfs_cache_infos[] = {
562 .cache = &ecryptfs_auth_tok_list_item_cache,
563 .name = "ecryptfs_auth_tok_list_item",
564 .size = sizeof(struct ecryptfs_auth_tok_list_item),
567 .cache = &ecryptfs_file_info_cache,
568 .name = "ecryptfs_file_cache",
569 .size = sizeof(struct ecryptfs_file_info),
572 .cache = &ecryptfs_dentry_info_cache,
573 .name = "ecryptfs_dentry_info_cache",
574 .size = sizeof(struct ecryptfs_dentry_info),
577 .cache = &ecryptfs_inode_info_cache,
578 .name = "ecryptfs_inode_cache",
579 .size = sizeof(struct ecryptfs_inode_info),
580 .ctor = inode_info_init_once,
583 .cache = &ecryptfs_sb_info_cache,
584 .name = "ecryptfs_sb_cache",
585 .size = sizeof(struct ecryptfs_sb_info),
588 .cache = &ecryptfs_header_cache_0,
589 .name = "ecryptfs_headers_0",
590 .size = PAGE_CACHE_SIZE,
593 .cache = &ecryptfs_header_cache_1,
594 .name = "ecryptfs_headers_1",
595 .size = PAGE_CACHE_SIZE,
598 .cache = &ecryptfs_header_cache_2,
599 .name = "ecryptfs_headers_2",
600 .size = PAGE_CACHE_SIZE,
603 .cache = &ecryptfs_lower_page_cache,
604 .name = "ecryptfs_lower_page_cache",
605 .size = PAGE_CACHE_SIZE,
609 static void ecryptfs_free_kmem_caches(void)
613 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
614 struct ecryptfs_cache_info *info;
616 info = &ecryptfs_cache_infos[i];
618 kmem_cache_destroy(*(info->cache));
623 * ecryptfs_init_kmem_caches
625 * Returns zero on success; non-zero otherwise
627 static int ecryptfs_init_kmem_caches(void)
631 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
632 struct ecryptfs_cache_info *info;
634 info = &ecryptfs_cache_infos[i];
635 *(info->cache) = kmem_cache_create(info->name, info->size,
636 0, SLAB_HWCACHE_ALIGN, info->ctor, NULL);
637 if (!*(info->cache)) {
638 ecryptfs_free_kmem_caches();
639 ecryptfs_printk(KERN_WARNING, "%s: "
640 "kmem_cache_create failed\n",
648 struct ecryptfs_obj {
650 struct list_head slot_list;
654 struct ecryptfs_attribute {
655 struct attribute attr;
656 ssize_t(*show) (struct ecryptfs_obj *, char *);
657 ssize_t(*store) (struct ecryptfs_obj *, const char *, size_t);
661 ecryptfs_attr_store(struct kobject *kobj,
662 struct attribute *attr, const char *buf, size_t len)
664 struct ecryptfs_obj *obj = container_of(kobj, struct ecryptfs_obj,
666 struct ecryptfs_attribute *attribute =
667 container_of(attr, struct ecryptfs_attribute, attr);
669 return (attribute->store ? attribute->store(obj, buf, len) : 0);
673 ecryptfs_attr_show(struct kobject *kobj, struct attribute *attr, char *buf)
675 struct ecryptfs_obj *obj = container_of(kobj, struct ecryptfs_obj,
677 struct ecryptfs_attribute *attribute =
678 container_of(attr, struct ecryptfs_attribute, attr);
680 return (attribute->show ? attribute->show(obj, buf) : 0);
683 static struct sysfs_ops ecryptfs_sysfs_ops = {
684 .show = ecryptfs_attr_show,
685 .store = ecryptfs_attr_store
688 static struct kobj_type ecryptfs_ktype = {
689 .sysfs_ops = &ecryptfs_sysfs_ops
692 static decl_subsys(ecryptfs, &ecryptfs_ktype, NULL);
694 static ssize_t version_show(struct ecryptfs_obj *obj, char *buff)
696 return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK);
699 static struct ecryptfs_attribute sysfs_attr_version = __ATTR_RO(version);
701 struct ecryptfs_version_str_map_elem {
704 } ecryptfs_version_str_map[] = {
705 {ECRYPTFS_VERSIONING_PASSPHRASE, "passphrase"},
706 {ECRYPTFS_VERSIONING_PUBKEY, "pubkey"},
707 {ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH, "plaintext passthrough"},
708 {ECRYPTFS_VERSIONING_POLICY, "policy"}
711 static ssize_t version_str_show(struct ecryptfs_obj *obj, char *buff)
714 int remaining = PAGE_SIZE;
715 int total_written = 0;
718 for (i = 0; i < ARRAY_SIZE(ecryptfs_version_str_map); i++) {
721 if (!(ECRYPTFS_VERSIONING_MASK
722 & ecryptfs_version_str_map[i].flag))
724 entry_size = strlen(ecryptfs_version_str_map[i].str);
725 if ((entry_size + 2) > remaining)
727 memcpy(buff, ecryptfs_version_str_map[i].str, entry_size);
728 buff[entry_size++] = '\n';
729 buff[entry_size] = '\0';
731 total_written += entry_size;
732 remaining -= entry_size;
735 return total_written;
738 static struct ecryptfs_attribute sysfs_attr_version_str = __ATTR_RO(version_str);
740 static int do_sysfs_registration(void)
744 if ((rc = subsystem_register(&ecryptfs_subsys))) {
746 "Unable to register ecryptfs sysfs subsystem\n");
749 rc = sysfs_create_file(&ecryptfs_subsys.kset.kobj,
750 &sysfs_attr_version.attr);
753 "Unable to create ecryptfs version attribute\n");
754 subsystem_unregister(&ecryptfs_subsys);
757 rc = sysfs_create_file(&ecryptfs_subsys.kset.kobj,
758 &sysfs_attr_version_str.attr);
761 "Unable to create ecryptfs version_str attribute\n");
762 sysfs_remove_file(&ecryptfs_subsys.kset.kobj,
763 &sysfs_attr_version.attr);
764 subsystem_unregister(&ecryptfs_subsys);
771 static int __init ecryptfs_init(void)
775 if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) {
777 ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is "
778 "larger than the host's page size, and so "
779 "eCryptfs cannot run on this system. The "
780 "default eCryptfs extent size is [%d] bytes; "
781 "the page size is [%d] bytes.\n",
782 ECRYPTFS_DEFAULT_EXTENT_SIZE, PAGE_CACHE_SIZE);
785 rc = ecryptfs_init_kmem_caches();
788 "Failed to allocate one or more kmem_cache objects\n");
791 rc = register_filesystem(&ecryptfs_fs_type);
793 printk(KERN_ERR "Failed to register filesystem\n");
794 ecryptfs_free_kmem_caches();
797 kset_set_kset_s(&ecryptfs_subsys, fs_subsys);
798 sysfs_attr_version.attr.owner = THIS_MODULE;
799 sysfs_attr_version_str.attr.owner = THIS_MODULE;
800 rc = do_sysfs_registration();
802 printk(KERN_ERR "sysfs registration failed\n");
803 unregister_filesystem(&ecryptfs_fs_type);
804 ecryptfs_free_kmem_caches();
811 static void __exit ecryptfs_exit(void)
813 sysfs_remove_file(&ecryptfs_subsys.kset.kobj,
814 &sysfs_attr_version.attr);
815 sysfs_remove_file(&ecryptfs_subsys.kset.kobj,
816 &sysfs_attr_version_str.attr);
817 subsystem_unregister(&ecryptfs_subsys);
818 unregister_filesystem(&ecryptfs_fs_type);
819 ecryptfs_free_kmem_caches();
822 MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>");
823 MODULE_DESCRIPTION("eCryptfs");
825 MODULE_LICENSE("GPL");
827 module_init(ecryptfs_init)
828 module_exit(ecryptfs_exit)