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
)