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;
217 while ((p = strsep(&options, ",")) != NULL) {
220 token = match_token(p, tokens, args);
222 case ecryptfs_opt_sig:
223 case ecryptfs_opt_ecryptfs_sig:
224 sig_src = args[0].from;
226 mount_crypt_stat->global_auth_tok_sig;
227 memcpy(sig_dst, sig_src, ECRYPTFS_SIG_SIZE_HEX);
228 sig_dst[ECRYPTFS_SIG_SIZE_HEX] = '\0';
229 ecryptfs_printk(KERN_DEBUG,
230 "The mount_crypt_stat "
231 "global_auth_tok_sig set to: "
235 case ecryptfs_opt_debug:
236 case ecryptfs_opt_ecryptfs_debug:
237 debug_src = args[0].from;
239 (int)simple_strtol(debug_src, &debug_src,
241 ecryptfs_printk(KERN_DEBUG,
242 "Verbosity set to [%d]" "\n",
245 case ecryptfs_opt_cipher:
246 case ecryptfs_opt_ecryptfs_cipher:
247 cipher_name_src = args[0].from;
250 global_default_cipher_name;
251 strncpy(cipher_name_dst, cipher_name_src,
252 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
253 ecryptfs_printk(KERN_DEBUG,
254 "The mount_crypt_stat "
255 "global_default_cipher_name set to: "
256 "[%s]\n", cipher_name_dst);
259 case ecryptfs_opt_ecryptfs_key_bytes:
260 cipher_key_bytes_src = args[0].from;
262 (int)simple_strtol(cipher_key_bytes_src,
263 &cipher_key_bytes_src, 0);
264 mount_crypt_stat->global_default_cipher_key_size =
266 ecryptfs_printk(KERN_DEBUG,
267 "The mount_crypt_stat "
268 "global_default_cipher_key_size "
269 "set to: [%d]\n", mount_crypt_stat->
270 global_default_cipher_key_size);
271 cipher_key_bytes_set = 1;
273 case ecryptfs_opt_passthrough:
274 mount_crypt_stat->flags |=
275 ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED;
277 case ecryptfs_opt_err:
279 ecryptfs_printk(KERN_WARNING,
280 "eCryptfs: unrecognized option '%s'\n",
284 /* Do not support lack of mount-wide signature in 0.1
288 ecryptfs_printk(KERN_ERR, "You must supply a valid "
289 "passphrase auth tok signature as a mount "
290 "parameter; see the eCryptfs README\n");
293 if (!cipher_name_set) {
294 cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
295 if (unlikely(cipher_name_len
296 >= ECRYPTFS_MAX_CIPHER_NAME_SIZE)) {
301 memcpy(mount_crypt_stat->global_default_cipher_name,
302 ECRYPTFS_DEFAULT_CIPHER, cipher_name_len);
303 mount_crypt_stat->global_default_cipher_name[cipher_name_len]
306 if (!cipher_key_bytes_set) {
307 mount_crypt_stat->global_default_cipher_key_size = 0;
309 rc = ecryptfs_process_cipher(
310 &mount_crypt_stat->global_key_tfm,
311 mount_crypt_stat->global_default_cipher_name,
312 &mount_crypt_stat->global_default_cipher_key_size);
314 printk(KERN_ERR "Error attempting to initialize cipher [%s] "
315 "with key size [%Zd] bytes; rc = [%d]\n",
316 mount_crypt_stat->global_default_cipher_name,
317 mount_crypt_stat->global_default_cipher_key_size, rc);
321 mutex_init(&mount_crypt_stat->global_key_tfm_mutex);
322 ecryptfs_printk(KERN_DEBUG, "Requesting the key with description: "
323 "[%s]\n", mount_crypt_stat->global_auth_tok_sig);
324 /* The reference to this key is held until umount is done The
325 * call to key_put is done in ecryptfs_put_super() */
326 auth_tok_key = request_key(&key_type_user,
327 mount_crypt_stat->global_auth_tok_sig,
329 if (!auth_tok_key || IS_ERR(auth_tok_key)) {
330 ecryptfs_printk(KERN_ERR, "Could not find key with "
331 "description: [%s]\n",
332 mount_crypt_stat->global_auth_tok_sig);
333 process_request_key_err(PTR_ERR(auth_tok_key));
337 auth_tok = ecryptfs_get_key_payload_data(auth_tok_key);
338 if (ecryptfs_verify_version(auth_tok->version)) {
339 ecryptfs_printk(KERN_ERR, "Data structure version mismatch. "
340 "Userspace tools must match eCryptfs kernel "
341 "module with major version [%d] and minor "
342 "version [%d]\n", ECRYPTFS_VERSION_MAJOR,
343 ECRYPTFS_VERSION_MINOR);
347 if (auth_tok->token_type != ECRYPTFS_PASSWORD) {
348 ecryptfs_printk(KERN_ERR, "Invalid auth_tok structure "
349 "returned from key\n");
353 mount_crypt_stat->global_auth_tok_key = auth_tok_key;
354 mount_crypt_stat->global_auth_tok = auth_tok;
359 struct kmem_cache *ecryptfs_sb_info_cache;
362 * ecryptfs_fill_super
363 * @sb: The ecryptfs super block
364 * @raw_data: The options passed to mount
365 * @silent: Not used but required by function prototype
367 * Sets up what we can of the sb, rest is done in ecryptfs_read_super
369 * Returns zero on success; non-zero otherwise
372 ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
376 /* Released in ecryptfs_put_super() */
377 ecryptfs_set_superblock_private(sb,
378 kmem_cache_alloc(ecryptfs_sb_info_cache,
380 if (!ecryptfs_superblock_to_private(sb)) {
381 ecryptfs_printk(KERN_WARNING, "Out of memory\n");
385 memset(ecryptfs_superblock_to_private(sb), 0,
386 sizeof(struct ecryptfs_sb_info));
387 sb->s_op = &ecryptfs_sops;
388 /* Released through deactivate_super(sb) from get_sb_nodev */
389 sb->s_root = d_alloc(NULL, &(const struct qstr) {
390 .hash = 0,.name = "/",.len = 1});
392 ecryptfs_printk(KERN_ERR, "d_alloc failed\n");
396 sb->s_root->d_op = &ecryptfs_dops;
397 sb->s_root->d_sb = sb;
398 sb->s_root->d_parent = sb->s_root;
399 /* Released in d_release when dput(sb->s_root) is called */
400 /* through deactivate_super(sb) from get_sb_nodev() */
401 ecryptfs_set_dentry_private(sb->s_root,
402 kmem_cache_alloc(ecryptfs_dentry_info_cache,
404 if (!ecryptfs_dentry_to_private(sb->s_root)) {
405 ecryptfs_printk(KERN_ERR,
406 "dentry_info_cache alloc failed\n");
410 memset(ecryptfs_dentry_to_private(sb->s_root), 0,
411 sizeof(struct ecryptfs_dentry_info));
414 /* Should be able to rely on deactivate_super called from
420 * ecryptfs_read_super
421 * @sb: The ecryptfs super block
422 * @dev_name: The path to mount over
424 * Read the super block of the lower filesystem, and use
425 * ecryptfs_interpose to create our initial inode and super block
428 static int ecryptfs_read_super(struct super_block *sb, const char *dev_name)
432 struct dentry *lower_root;
433 struct vfsmount *lower_mnt;
435 memset(&nd, 0, sizeof(struct nameidata));
436 rc = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
438 ecryptfs_printk(KERN_WARNING, "path_lookup() failed\n");
441 lower_root = nd.dentry;
442 if (!lower_root->d_inode) {
443 ecryptfs_printk(KERN_WARNING,
444 "No directory to interpose on\n");
449 ecryptfs_set_superblock_lower(sb, lower_root->d_sb);
450 sb->s_maxbytes = lower_root->d_sb->s_maxbytes;
451 ecryptfs_set_dentry_lower(sb->s_root, lower_root);
452 ecryptfs_set_dentry_lower_mnt(sb->s_root, lower_mnt);
453 if ((rc = ecryptfs_interpose(lower_root, sb->s_root, sb, 0)))
467 * @dev_name: The path to mount over
468 * @raw_data: The options passed into the kernel
470 * The whole ecryptfs_get_sb process is broken into 4 functions:
471 * ecryptfs_parse_options(): handle options passed to ecryptfs, if any
472 * ecryptfs_fill_super(): used by get_sb_nodev, fills out the super_block
473 * with as much information as it can before needing
474 * the lower filesystem.
475 * ecryptfs_read_super(): this accesses the lower filesystem and uses
476 * ecryptfs_interpolate to perform most of the linking
477 * ecryptfs_interpolate(): links the lower filesystem into ecryptfs
479 static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
480 const char *dev_name, void *raw_data,
481 struct vfsmount *mnt)
484 struct super_block *sb;
486 rc = get_sb_nodev(fs_type, flags, raw_data, ecryptfs_fill_super, mnt);
488 printk(KERN_ERR "Getting sb failed; rc = [%d]\n", rc);
492 rc = ecryptfs_parse_options(sb, raw_data);
494 printk(KERN_ERR "Error parsing options; rc = [%d]\n", rc);
497 rc = ecryptfs_read_super(sb, dev_name);
499 printk(KERN_ERR "Reading sb failed; rc = [%d]\n", rc);
505 up_write(&sb->s_umount);
506 deactivate_super(sb);
512 * ecryptfs_kill_block_super
513 * @sb: The ecryptfs super block
515 * Used to bring the superblock down and free the private data.
516 * Private data is free'd in ecryptfs_put_super()
518 static void ecryptfs_kill_block_super(struct super_block *sb)
520 generic_shutdown_super(sb);
523 static struct file_system_type ecryptfs_fs_type = {
524 .owner = THIS_MODULE,
526 .get_sb = ecryptfs_get_sb,
527 .kill_sb = ecryptfs_kill_block_super,
532 * inode_info_init_once
534 * Initializes the ecryptfs_inode_info_cache when it is created
537 inode_info_init_once(void *vptr, struct kmem_cache *cachep, unsigned long flags)
539 struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
541 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
542 SLAB_CTOR_CONSTRUCTOR)
543 inode_init_once(&ei->vfs_inode);
546 static struct ecryptfs_cache_info {
547 kmem_cache_t **cache;
550 void (*ctor)(void*, struct kmem_cache *, unsigned long);
551 } ecryptfs_cache_infos[] = {
553 .cache = &ecryptfs_auth_tok_list_item_cache,
554 .name = "ecryptfs_auth_tok_list_item",
555 .size = sizeof(struct ecryptfs_auth_tok_list_item),
558 .cache = &ecryptfs_file_info_cache,
559 .name = "ecryptfs_file_cache",
560 .size = sizeof(struct ecryptfs_file_info),
563 .cache = &ecryptfs_dentry_info_cache,
564 .name = "ecryptfs_dentry_info_cache",
565 .size = sizeof(struct ecryptfs_dentry_info),
568 .cache = &ecryptfs_inode_info_cache,
569 .name = "ecryptfs_inode_cache",
570 .size = sizeof(struct ecryptfs_inode_info),
571 .ctor = inode_info_init_once,
574 .cache = &ecryptfs_sb_info_cache,
575 .name = "ecryptfs_sb_cache",
576 .size = sizeof(struct ecryptfs_sb_info),
579 .cache = &ecryptfs_header_cache_0,
580 .name = "ecryptfs_headers_0",
581 .size = PAGE_CACHE_SIZE,
584 .cache = &ecryptfs_header_cache_1,
585 .name = "ecryptfs_headers_1",
586 .size = PAGE_CACHE_SIZE,
589 .cache = &ecryptfs_header_cache_2,
590 .name = "ecryptfs_headers_2",
591 .size = PAGE_CACHE_SIZE,
594 .cache = &ecryptfs_lower_page_cache,
595 .name = "ecryptfs_lower_page_cache",
596 .size = PAGE_CACHE_SIZE,
600 static void ecryptfs_free_kmem_caches(void)
604 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
605 struct ecryptfs_cache_info *info;
607 info = &ecryptfs_cache_infos[i];
609 kmem_cache_destroy(*(info->cache));
614 * ecryptfs_init_kmem_caches
616 * Returns zero on success; non-zero otherwise
618 static int ecryptfs_init_kmem_caches(void)
622 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
623 struct ecryptfs_cache_info *info;
625 info = &ecryptfs_cache_infos[i];
626 *(info->cache) = kmem_cache_create(info->name, info->size,
627 0, SLAB_HWCACHE_ALIGN, info->ctor, NULL);
628 if (!*(info->cache)) {
629 ecryptfs_free_kmem_caches();
630 ecryptfs_printk(KERN_WARNING, "%s: "
631 "kmem_cache_create failed\n",
639 struct ecryptfs_obj {
641 struct list_head slot_list;
645 struct ecryptfs_attribute {
646 struct attribute attr;
647 ssize_t(*show) (struct ecryptfs_obj *, char *);
648 ssize_t(*store) (struct ecryptfs_obj *, const char *, size_t);
652 ecryptfs_attr_store(struct kobject *kobj,
653 struct attribute *attr, const char *buf, size_t len)
655 struct ecryptfs_obj *obj = container_of(kobj, struct ecryptfs_obj,
657 struct ecryptfs_attribute *attribute =
658 container_of(attr, struct ecryptfs_attribute, attr);
660 return (attribute->store ? attribute->store(obj, buf, len) : 0);
664 ecryptfs_attr_show(struct kobject *kobj, struct attribute *attr, char *buf)
666 struct ecryptfs_obj *obj = container_of(kobj, struct ecryptfs_obj,
668 struct ecryptfs_attribute *attribute =
669 container_of(attr, struct ecryptfs_attribute, attr);
671 return (attribute->show ? attribute->show(obj, buf) : 0);
674 static struct sysfs_ops ecryptfs_sysfs_ops = {
675 .show = ecryptfs_attr_show,
676 .store = ecryptfs_attr_store
679 static struct kobj_type ecryptfs_ktype = {
680 .sysfs_ops = &ecryptfs_sysfs_ops
683 static decl_subsys(ecryptfs, &ecryptfs_ktype, NULL);
685 static ssize_t version_show(struct ecryptfs_obj *obj, char *buff)
687 return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK);
690 static struct ecryptfs_attribute sysfs_attr_version = __ATTR_RO(version);
692 struct ecryptfs_version_str_map_elem {
695 } ecryptfs_version_str_map[] = {
696 {ECRYPTFS_VERSIONING_PASSPHRASE, "passphrase"},
697 {ECRYPTFS_VERSIONING_PUBKEY, "pubkey"},
698 {ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH, "plaintext passthrough"},
699 {ECRYPTFS_VERSIONING_POLICY, "policy"}
702 static ssize_t version_str_show(struct ecryptfs_obj *obj, char *buff)
705 int remaining = PAGE_SIZE;
706 int total_written = 0;
709 for (i = 0; i < ARRAY_SIZE(ecryptfs_version_str_map); i++) {
712 if (!(ECRYPTFS_VERSIONING_MASK
713 & ecryptfs_version_str_map[i].flag))
715 entry_size = strlen(ecryptfs_version_str_map[i].str);
716 if ((entry_size + 2) > remaining)
718 memcpy(buff, ecryptfs_version_str_map[i].str, entry_size);
719 buff[entry_size++] = '\n';
720 buff[entry_size] = '\0';
722 total_written += entry_size;
723 remaining -= entry_size;
726 return total_written;
729 static struct ecryptfs_attribute sysfs_attr_version_str = __ATTR_RO(version_str);
731 static int do_sysfs_registration(void)
735 if ((rc = subsystem_register(&ecryptfs_subsys))) {
737 "Unable to register ecryptfs sysfs subsystem\n");
740 rc = sysfs_create_file(&ecryptfs_subsys.kset.kobj,
741 &sysfs_attr_version.attr);
744 "Unable to create ecryptfs version attribute\n");
745 subsystem_unregister(&ecryptfs_subsys);
748 rc = sysfs_create_file(&ecryptfs_subsys.kset.kobj,
749 &sysfs_attr_version_str.attr);
752 "Unable to create ecryptfs version_str attribute\n");
753 sysfs_remove_file(&ecryptfs_subsys.kset.kobj,
754 &sysfs_attr_version.attr);
755 subsystem_unregister(&ecryptfs_subsys);
762 static int __init ecryptfs_init(void)
766 if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) {
768 ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is "
769 "larger than the host's page size, and so "
770 "eCryptfs cannot run on this system. The "
771 "default eCryptfs extent size is [%d] bytes; "
772 "the page size is [%d] bytes.\n",
773 ECRYPTFS_DEFAULT_EXTENT_SIZE, PAGE_CACHE_SIZE);
776 rc = ecryptfs_init_kmem_caches();
779 "Failed to allocate one or more kmem_cache objects\n");
782 rc = register_filesystem(&ecryptfs_fs_type);
784 printk(KERN_ERR "Failed to register filesystem\n");
785 ecryptfs_free_kmem_caches();
788 kset_set_kset_s(&ecryptfs_subsys, fs_subsys);
789 sysfs_attr_version.attr.owner = THIS_MODULE;
790 sysfs_attr_version_str.attr.owner = THIS_MODULE;
791 rc = do_sysfs_registration();
793 printk(KERN_ERR "sysfs registration failed\n");
794 unregister_filesystem(&ecryptfs_fs_type);
795 ecryptfs_free_kmem_caches();
802 static void __exit ecryptfs_exit(void)
804 sysfs_remove_file(&ecryptfs_subsys.kset.kobj,
805 &sysfs_attr_version.attr);
806 sysfs_remove_file(&ecryptfs_subsys.kset.kobj,
807 &sysfs_attr_version_str.attr);
808 subsystem_unregister(&ecryptfs_subsys);
809 unregister_filesystem(&ecryptfs_fs_type);
810 ecryptfs_free_kmem_caches();
813 MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>");
814 MODULE_DESCRIPTION("eCryptfs");
816 MODULE_LICENSE("GPL");
818 module_init(ecryptfs_init)
819 module_exit(ecryptfs_exit)