Commit | Line | Data |
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0b81d077 JK |
1 | /* |
2 | * This contains encryption functions for per-file encryption. | |
3 | * | |
4 | * Copyright (C) 2015, Google, Inc. | |
5 | * Copyright (C) 2015, Motorola Mobility | |
6 | * | |
7 | * Written by Michael Halcrow, 2014. | |
8 | * | |
9 | * Filename encryption additions | |
10 | * Uday Savagaonkar, 2014 | |
11 | * Encryption policy handling additions | |
12 | * Ildar Muslukhov, 2014 | |
13 | * Add fscrypt_pullback_bio_page() | |
14 | * Jaegeuk Kim, 2015. | |
15 | * | |
16 | * This has not yet undergone a rigorous security audit. | |
17 | * | |
18 | * The usage of AES-XTS should conform to recommendations in NIST | |
19 | * Special Publication 800-38E and IEEE P1619/D16. | |
20 | */ | |
21 | ||
0b81d077 JK |
22 | #include <linux/pagemap.h> |
23 | #include <linux/mempool.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/scatterlist.h> | |
26 | #include <linux/ratelimit.h> | |
0b81d077 | 27 | #include <linux/dcache.h> |
03a8bb0e | 28 | #include <linux/namei.h> |
b7e7cf7a | 29 | #include <crypto/aes.h> |
a575784c | 30 | #include <crypto/skcipher.h> |
cc4e0df0 | 31 | #include "fscrypt_private.h" |
0b81d077 JK |
32 | |
33 | static unsigned int num_prealloc_crypto_pages = 32; | |
34 | static unsigned int num_prealloc_crypto_ctxs = 128; | |
35 | ||
36 | module_param(num_prealloc_crypto_pages, uint, 0444); | |
37 | MODULE_PARM_DESC(num_prealloc_crypto_pages, | |
38 | "Number of crypto pages to preallocate"); | |
39 | module_param(num_prealloc_crypto_ctxs, uint, 0444); | |
40 | MODULE_PARM_DESC(num_prealloc_crypto_ctxs, | |
41 | "Number of crypto contexts to preallocate"); | |
42 | ||
43 | static mempool_t *fscrypt_bounce_page_pool = NULL; | |
44 | ||
45 | static LIST_HEAD(fscrypt_free_ctxs); | |
46 | static DEFINE_SPINLOCK(fscrypt_ctx_lock); | |
47 | ||
0cb8dae4 | 48 | static struct workqueue_struct *fscrypt_read_workqueue; |
0b81d077 JK |
49 | static DEFINE_MUTEX(fscrypt_init_mutex); |
50 | ||
51 | static struct kmem_cache *fscrypt_ctx_cachep; | |
52 | struct kmem_cache *fscrypt_info_cachep; | |
53 | ||
0cb8dae4 EB |
54 | void fscrypt_enqueue_decrypt_work(struct work_struct *work) |
55 | { | |
56 | queue_work(fscrypt_read_workqueue, work); | |
57 | } | |
58 | EXPORT_SYMBOL(fscrypt_enqueue_decrypt_work); | |
59 | ||
0b81d077 JK |
60 | /** |
61 | * fscrypt_release_ctx() - Releases an encryption context | |
62 | * @ctx: The encryption context to release. | |
63 | * | |
64 | * If the encryption context was allocated from the pre-allocated pool, returns | |
65 | * it to that pool. Else, frees it. | |
66 | * | |
67 | * If there's a bounce page in the context, this frees that. | |
68 | */ | |
69 | void fscrypt_release_ctx(struct fscrypt_ctx *ctx) | |
70 | { | |
71 | unsigned long flags; | |
72 | ||
6a34e4d2 | 73 | if (ctx->flags & FS_CTX_HAS_BOUNCE_BUFFER_FL && ctx->w.bounce_page) { |
0b81d077 JK |
74 | mempool_free(ctx->w.bounce_page, fscrypt_bounce_page_pool); |
75 | ctx->w.bounce_page = NULL; | |
76 | } | |
77 | ctx->w.control_page = NULL; | |
78 | if (ctx->flags & FS_CTX_REQUIRES_FREE_ENCRYPT_FL) { | |
79 | kmem_cache_free(fscrypt_ctx_cachep, ctx); | |
80 | } else { | |
81 | spin_lock_irqsave(&fscrypt_ctx_lock, flags); | |
82 | list_add(&ctx->free_list, &fscrypt_free_ctxs); | |
83 | spin_unlock_irqrestore(&fscrypt_ctx_lock, flags); | |
84 | } | |
85 | } | |
86 | EXPORT_SYMBOL(fscrypt_release_ctx); | |
87 | ||
88 | /** | |
89 | * fscrypt_get_ctx() - Gets an encryption context | |
90 | * @inode: The inode for which we are doing the crypto | |
b32e4482 | 91 | * @gfp_flags: The gfp flag for memory allocation |
0b81d077 JK |
92 | * |
93 | * Allocates and initializes an encryption context. | |
94 | * | |
95 | * Return: An allocated and initialized encryption context on success; error | |
96 | * value or NULL otherwise. | |
97 | */ | |
0b93e1b9 | 98 | struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *inode, gfp_t gfp_flags) |
0b81d077 JK |
99 | { |
100 | struct fscrypt_ctx *ctx = NULL; | |
101 | struct fscrypt_info *ci = inode->i_crypt_info; | |
102 | unsigned long flags; | |
103 | ||
104 | if (ci == NULL) | |
105 | return ERR_PTR(-ENOKEY); | |
106 | ||
107 | /* | |
108 | * We first try getting the ctx from a free list because in | |
109 | * the common case the ctx will have an allocated and | |
110 | * initialized crypto tfm, so it's probably a worthwhile | |
111 | * optimization. For the bounce page, we first try getting it | |
112 | * from the kernel allocator because that's just about as fast | |
113 | * as getting it from a list and because a cache of free pages | |
114 | * should generally be a "last resort" option for a filesystem | |
115 | * to be able to do its job. | |
116 | */ | |
117 | spin_lock_irqsave(&fscrypt_ctx_lock, flags); | |
118 | ctx = list_first_entry_or_null(&fscrypt_free_ctxs, | |
119 | struct fscrypt_ctx, free_list); | |
120 | if (ctx) | |
121 | list_del(&ctx->free_list); | |
122 | spin_unlock_irqrestore(&fscrypt_ctx_lock, flags); | |
123 | if (!ctx) { | |
b32e4482 | 124 | ctx = kmem_cache_zalloc(fscrypt_ctx_cachep, gfp_flags); |
0b81d077 JK |
125 | if (!ctx) |
126 | return ERR_PTR(-ENOMEM); | |
127 | ctx->flags |= FS_CTX_REQUIRES_FREE_ENCRYPT_FL; | |
128 | } else { | |
129 | ctx->flags &= ~FS_CTX_REQUIRES_FREE_ENCRYPT_FL; | |
130 | } | |
6a34e4d2 | 131 | ctx->flags &= ~FS_CTX_HAS_BOUNCE_BUFFER_FL; |
0b81d077 JK |
132 | return ctx; |
133 | } | |
134 | EXPORT_SYMBOL(fscrypt_get_ctx); | |
135 | ||
58ae7468 RW |
136 | int fscrypt_do_page_crypto(const struct inode *inode, fscrypt_direction_t rw, |
137 | u64 lblk_num, struct page *src_page, | |
138 | struct page *dest_page, unsigned int len, | |
139 | unsigned int offs, gfp_t gfp_flags) | |
0b81d077 | 140 | { |
fb445437 EB |
141 | struct { |
142 | __le64 index; | |
b7e7cf7a DW |
143 | u8 padding[FS_IV_SIZE - sizeof(__le64)]; |
144 | } iv; | |
d407574e | 145 | struct skcipher_request *req = NULL; |
d0082e1a | 146 | DECLARE_CRYPTO_WAIT(wait); |
0b81d077 JK |
147 | struct scatterlist dst, src; |
148 | struct fscrypt_info *ci = inode->i_crypt_info; | |
d407574e | 149 | struct crypto_skcipher *tfm = ci->ci_ctfm; |
0b81d077 JK |
150 | int res = 0; |
151 | ||
1400451f DG |
152 | BUG_ON(len == 0); |
153 | ||
b7e7cf7a DW |
154 | BUILD_BUG_ON(sizeof(iv) != FS_IV_SIZE); |
155 | BUILD_BUG_ON(AES_BLOCK_SIZE != FS_IV_SIZE); | |
156 | iv.index = cpu_to_le64(lblk_num); | |
157 | memset(iv.padding, 0, sizeof(iv.padding)); | |
158 | ||
159 | if (ci->ci_essiv_tfm != NULL) { | |
160 | crypto_cipher_encrypt_one(ci->ci_essiv_tfm, (u8 *)&iv, | |
161 | (u8 *)&iv); | |
162 | } | |
163 | ||
b32e4482 | 164 | req = skcipher_request_alloc(tfm, gfp_flags); |
c90fd775 | 165 | if (!req) |
0b81d077 | 166 | return -ENOMEM; |
0b81d077 | 167 | |
d407574e | 168 | skcipher_request_set_callback( |
0b81d077 | 169 | req, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
d0082e1a | 170 | crypto_req_done, &wait); |
0b81d077 | 171 | |
0b81d077 | 172 | sg_init_table(&dst, 1); |
1400451f | 173 | sg_set_page(&dst, dest_page, len, offs); |
0b81d077 | 174 | sg_init_table(&src, 1); |
1400451f | 175 | sg_set_page(&src, src_page, len, offs); |
b7e7cf7a | 176 | skcipher_request_set_crypt(req, &src, &dst, len, &iv); |
0b81d077 | 177 | if (rw == FS_DECRYPT) |
d0082e1a | 178 | res = crypto_wait_req(crypto_skcipher_decrypt(req), &wait); |
0b81d077 | 179 | else |
d0082e1a | 180 | res = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); |
d407574e | 181 | skcipher_request_free(req); |
0b81d077 | 182 | if (res) { |
544d08fd EB |
183 | fscrypt_err(inode->i_sb, |
184 | "%scryption failed for inode %lu, block %llu: %d", | |
185 | (rw == FS_DECRYPT ? "de" : "en"), | |
186 | inode->i_ino, lblk_num, res); | |
0b81d077 JK |
187 | return res; |
188 | } | |
189 | return 0; | |
190 | } | |
191 | ||
58ae7468 RW |
192 | struct page *fscrypt_alloc_bounce_page(struct fscrypt_ctx *ctx, |
193 | gfp_t gfp_flags) | |
0b81d077 | 194 | { |
b32e4482 | 195 | ctx->w.bounce_page = mempool_alloc(fscrypt_bounce_page_pool, gfp_flags); |
0b81d077 JK |
196 | if (ctx->w.bounce_page == NULL) |
197 | return ERR_PTR(-ENOMEM); | |
6a34e4d2 | 198 | ctx->flags |= FS_CTX_HAS_BOUNCE_BUFFER_FL; |
0b81d077 JK |
199 | return ctx->w.bounce_page; |
200 | } | |
201 | ||
202 | /** | |
203 | * fscypt_encrypt_page() - Encrypts a page | |
1400451f DG |
204 | * @inode: The inode for which the encryption should take place |
205 | * @page: The page to encrypt. Must be locked for bounce-page | |
206 | * encryption. | |
207 | * @len: Length of data to encrypt in @page and encrypted | |
208 | * data in returned page. | |
209 | * @offs: Offset of data within @page and returned | |
210 | * page holding encrypted data. | |
211 | * @lblk_num: Logical block number. This must be unique for multiple | |
212 | * calls with same inode, except when overwriting | |
213 | * previously written data. | |
214 | * @gfp_flags: The gfp flag for memory allocation | |
0b81d077 | 215 | * |
1400451f DG |
216 | * Encrypts @page using the ctx encryption context. Performs encryption |
217 | * either in-place or into a newly allocated bounce page. | |
218 | * Called on the page write path. | |
0b81d077 | 219 | * |
1400451f DG |
220 | * Bounce page allocation is the default. |
221 | * In this case, the contents of @page are encrypted and stored in an | |
222 | * allocated bounce page. @page has to be locked and the caller must call | |
0b81d077 JK |
223 | * fscrypt_restore_control_page() on the returned ciphertext page to |
224 | * release the bounce buffer and the encryption context. | |
225 | * | |
bd7b8290 | 226 | * In-place encryption is used by setting the FS_CFLG_OWN_PAGES flag in |
1400451f DG |
227 | * fscrypt_operations. Here, the input-page is returned with its content |
228 | * encrypted. | |
229 | * | |
230 | * Return: A page with the encrypted content on success. Else, an | |
0b81d077 JK |
231 | * error value or NULL. |
232 | */ | |
0b93e1b9 | 233 | struct page *fscrypt_encrypt_page(const struct inode *inode, |
1400451f DG |
234 | struct page *page, |
235 | unsigned int len, | |
236 | unsigned int offs, | |
237 | u64 lblk_num, gfp_t gfp_flags) | |
7821d4dd | 238 | |
0b81d077 JK |
239 | { |
240 | struct fscrypt_ctx *ctx; | |
1400451f | 241 | struct page *ciphertext_page = page; |
0b81d077 JK |
242 | int err; |
243 | ||
1400451f | 244 | BUG_ON(len % FS_CRYPTO_BLOCK_SIZE != 0); |
0b81d077 | 245 | |
bd7b8290 | 246 | if (inode->i_sb->s_cop->flags & FS_CFLG_OWN_PAGES) { |
9e532772 | 247 | /* with inplace-encryption we just encrypt the page */ |
58ae7468 RW |
248 | err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk_num, page, |
249 | ciphertext_page, len, offs, | |
250 | gfp_flags); | |
9e532772 DG |
251 | if (err) |
252 | return ERR_PTR(err); | |
253 | ||
254 | return ciphertext_page; | |
255 | } | |
256 | ||
bd7b8290 DG |
257 | BUG_ON(!PageLocked(page)); |
258 | ||
b32e4482 | 259 | ctx = fscrypt_get_ctx(inode, gfp_flags); |
0b81d077 JK |
260 | if (IS_ERR(ctx)) |
261 | return (struct page *)ctx; | |
262 | ||
9e532772 | 263 | /* The encryption operation will require a bounce page. */ |
58ae7468 | 264 | ciphertext_page = fscrypt_alloc_bounce_page(ctx, gfp_flags); |
9e532772 DG |
265 | if (IS_ERR(ciphertext_page)) |
266 | goto errout; | |
0b81d077 | 267 | |
1400451f | 268 | ctx->w.control_page = page; |
58ae7468 RW |
269 | err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk_num, |
270 | page, ciphertext_page, len, offs, | |
271 | gfp_flags); | |
0b81d077 JK |
272 | if (err) { |
273 | ciphertext_page = ERR_PTR(err); | |
274 | goto errout; | |
275 | } | |
9e532772 DG |
276 | SetPagePrivate(ciphertext_page); |
277 | set_page_private(ciphertext_page, (unsigned long)ctx); | |
278 | lock_page(ciphertext_page); | |
0b81d077 JK |
279 | return ciphertext_page; |
280 | ||
281 | errout: | |
282 | fscrypt_release_ctx(ctx); | |
283 | return ciphertext_page; | |
284 | } | |
285 | EXPORT_SYMBOL(fscrypt_encrypt_page); | |
286 | ||
287 | /** | |
7821d4dd | 288 | * fscrypt_decrypt_page() - Decrypts a page in-place |
1400451f DG |
289 | * @inode: The corresponding inode for the page to decrypt. |
290 | * @page: The page to decrypt. Must be locked in case | |
bd7b8290 | 291 | * it is a writeback page (FS_CFLG_OWN_PAGES unset). |
1400451f DG |
292 | * @len: Number of bytes in @page to be decrypted. |
293 | * @offs: Start of data in @page. | |
294 | * @lblk_num: Logical block number. | |
0b81d077 JK |
295 | * |
296 | * Decrypts page in-place using the ctx encryption context. | |
297 | * | |
298 | * Called from the read completion callback. | |
299 | * | |
300 | * Return: Zero on success, non-zero otherwise. | |
301 | */ | |
0b93e1b9 | 302 | int fscrypt_decrypt_page(const struct inode *inode, struct page *page, |
1400451f | 303 | unsigned int len, unsigned int offs, u64 lblk_num) |
0b81d077 | 304 | { |
bd7b8290 DG |
305 | if (!(inode->i_sb->s_cop->flags & FS_CFLG_OWN_PAGES)) |
306 | BUG_ON(!PageLocked(page)); | |
307 | ||
58ae7468 RW |
308 | return fscrypt_do_page_crypto(inode, FS_DECRYPT, lblk_num, page, page, |
309 | len, offs, GFP_NOFS); | |
0b81d077 JK |
310 | } |
311 | EXPORT_SYMBOL(fscrypt_decrypt_page); | |
312 | ||
0b81d077 JK |
313 | /* |
314 | * Validate dentries for encrypted directories to make sure we aren't | |
315 | * potentially caching stale data after a key has been added or | |
316 | * removed. | |
317 | */ | |
318 | static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) | |
319 | { | |
d7d75352 | 320 | struct dentry *dir; |
0b81d077 JK |
321 | int dir_has_key, cached_with_key; |
322 | ||
03a8bb0e JK |
323 | if (flags & LOOKUP_RCU) |
324 | return -ECHILD; | |
325 | ||
d7d75352 | 326 | dir = dget_parent(dentry); |
e0428a26 | 327 | if (!IS_ENCRYPTED(d_inode(dir))) { |
d7d75352 | 328 | dput(dir); |
0b81d077 | 329 | return 0; |
d7d75352 | 330 | } |
0b81d077 | 331 | |
0b81d077 JK |
332 | spin_lock(&dentry->d_lock); |
333 | cached_with_key = dentry->d_flags & DCACHE_ENCRYPTED_WITH_KEY; | |
334 | spin_unlock(&dentry->d_lock); | |
1b53cf98 | 335 | dir_has_key = (d_inode(dir)->i_crypt_info != NULL); |
d7d75352 | 336 | dput(dir); |
0b81d077 JK |
337 | |
338 | /* | |
339 | * If the dentry was cached without the key, and it is a | |
340 | * negative dentry, it might be a valid name. We can't check | |
341 | * if the key has since been made available due to locking | |
342 | * reasons, so we fail the validation so ext4_lookup() can do | |
343 | * this check. | |
344 | * | |
345 | * We also fail the validation if the dentry was created with | |
346 | * the key present, but we no longer have the key, or vice versa. | |
347 | */ | |
348 | if ((!cached_with_key && d_is_negative(dentry)) || | |
349 | (!cached_with_key && dir_has_key) || | |
350 | (cached_with_key && !dir_has_key)) | |
351 | return 0; | |
352 | return 1; | |
353 | } | |
354 | ||
355 | const struct dentry_operations fscrypt_d_ops = { | |
356 | .d_revalidate = fscrypt_d_revalidate, | |
357 | }; | |
0b81d077 | 358 | |
0b81d077 JK |
359 | void fscrypt_restore_control_page(struct page *page) |
360 | { | |
361 | struct fscrypt_ctx *ctx; | |
362 | ||
363 | ctx = (struct fscrypt_ctx *)page_private(page); | |
364 | set_page_private(page, (unsigned long)NULL); | |
365 | ClearPagePrivate(page); | |
366 | unlock_page(page); | |
367 | fscrypt_release_ctx(ctx); | |
368 | } | |
369 | EXPORT_SYMBOL(fscrypt_restore_control_page); | |
370 | ||
371 | static void fscrypt_destroy(void) | |
372 | { | |
373 | struct fscrypt_ctx *pos, *n; | |
374 | ||
375 | list_for_each_entry_safe(pos, n, &fscrypt_free_ctxs, free_list) | |
376 | kmem_cache_free(fscrypt_ctx_cachep, pos); | |
377 | INIT_LIST_HEAD(&fscrypt_free_ctxs); | |
378 | mempool_destroy(fscrypt_bounce_page_pool); | |
379 | fscrypt_bounce_page_pool = NULL; | |
380 | } | |
381 | ||
382 | /** | |
383 | * fscrypt_initialize() - allocate major buffers for fs encryption. | |
f32d7ac2 | 384 | * @cop_flags: fscrypt operations flags |
0b81d077 JK |
385 | * |
386 | * We only call this when we start accessing encrypted files, since it | |
387 | * results in memory getting allocated that wouldn't otherwise be used. | |
388 | * | |
389 | * Return: Zero on success, non-zero otherwise. | |
390 | */ | |
f32d7ac2 | 391 | int fscrypt_initialize(unsigned int cop_flags) |
0b81d077 JK |
392 | { |
393 | int i, res = -ENOMEM; | |
394 | ||
a0b3bc85 EB |
395 | /* No need to allocate a bounce page pool if this FS won't use it. */ |
396 | if (cop_flags & FS_CFLG_OWN_PAGES) | |
0b81d077 JK |
397 | return 0; |
398 | ||
399 | mutex_lock(&fscrypt_init_mutex); | |
400 | if (fscrypt_bounce_page_pool) | |
401 | goto already_initialized; | |
402 | ||
403 | for (i = 0; i < num_prealloc_crypto_ctxs; i++) { | |
404 | struct fscrypt_ctx *ctx; | |
405 | ||
406 | ctx = kmem_cache_zalloc(fscrypt_ctx_cachep, GFP_NOFS); | |
407 | if (!ctx) | |
408 | goto fail; | |
409 | list_add(&ctx->free_list, &fscrypt_free_ctxs); | |
410 | } | |
411 | ||
412 | fscrypt_bounce_page_pool = | |
413 | mempool_create_page_pool(num_prealloc_crypto_pages, 0); | |
414 | if (!fscrypt_bounce_page_pool) | |
415 | goto fail; | |
416 | ||
417 | already_initialized: | |
418 | mutex_unlock(&fscrypt_init_mutex); | |
419 | return 0; | |
420 | fail: | |
421 | fscrypt_destroy(); | |
422 | mutex_unlock(&fscrypt_init_mutex); | |
423 | return res; | |
424 | } | |
0b81d077 | 425 | |
544d08fd EB |
426 | void fscrypt_msg(struct super_block *sb, const char *level, |
427 | const char *fmt, ...) | |
428 | { | |
429 | static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, | |
430 | DEFAULT_RATELIMIT_BURST); | |
431 | struct va_format vaf; | |
432 | va_list args; | |
433 | ||
434 | if (!__ratelimit(&rs)) | |
435 | return; | |
436 | ||
437 | va_start(args, fmt); | |
438 | vaf.fmt = fmt; | |
439 | vaf.va = &args; | |
440 | if (sb) | |
441 | printk("%sfscrypt (%s): %pV\n", level, sb->s_id, &vaf); | |
442 | else | |
443 | printk("%sfscrypt: %pV\n", level, &vaf); | |
444 | va_end(args); | |
445 | } | |
446 | ||
0b81d077 JK |
447 | /** |
448 | * fscrypt_init() - Set up for fs encryption. | |
449 | */ | |
450 | static int __init fscrypt_init(void) | |
451 | { | |
36dd26e0 EB |
452 | /* |
453 | * Use an unbound workqueue to allow bios to be decrypted in parallel | |
454 | * even when they happen to complete on the same CPU. This sacrifices | |
455 | * locality, but it's worthwhile since decryption is CPU-intensive. | |
456 | * | |
457 | * Also use a high-priority workqueue to prioritize decryption work, | |
458 | * which blocks reads from completing, over regular application tasks. | |
459 | */ | |
0b81d077 | 460 | fscrypt_read_workqueue = alloc_workqueue("fscrypt_read_queue", |
36dd26e0 EB |
461 | WQ_UNBOUND | WQ_HIGHPRI, |
462 | num_online_cpus()); | |
0b81d077 JK |
463 | if (!fscrypt_read_workqueue) |
464 | goto fail; | |
465 | ||
466 | fscrypt_ctx_cachep = KMEM_CACHE(fscrypt_ctx, SLAB_RECLAIM_ACCOUNT); | |
467 | if (!fscrypt_ctx_cachep) | |
468 | goto fail_free_queue; | |
469 | ||
470 | fscrypt_info_cachep = KMEM_CACHE(fscrypt_info, SLAB_RECLAIM_ACCOUNT); | |
471 | if (!fscrypt_info_cachep) | |
472 | goto fail_free_ctx; | |
473 | ||
474 | return 0; | |
475 | ||
476 | fail_free_ctx: | |
477 | kmem_cache_destroy(fscrypt_ctx_cachep); | |
478 | fail_free_queue: | |
479 | destroy_workqueue(fscrypt_read_workqueue); | |
480 | fail: | |
481 | return -ENOMEM; | |
482 | } | |
483 | module_init(fscrypt_init) | |
484 | ||
485 | /** | |
486 | * fscrypt_exit() - Shutdown the fs encryption system | |
487 | */ | |
488 | static void __exit fscrypt_exit(void) | |
489 | { | |
490 | fscrypt_destroy(); | |
491 | ||
492 | if (fscrypt_read_workqueue) | |
493 | destroy_workqueue(fscrypt_read_workqueue); | |
494 | kmem_cache_destroy(fscrypt_ctx_cachep); | |
495 | kmem_cache_destroy(fscrypt_info_cachep); | |
b7e7cf7a DW |
496 | |
497 | fscrypt_essiv_cleanup(); | |
0b81d077 JK |
498 | } |
499 | module_exit(fscrypt_exit); | |
500 | ||
501 | MODULE_LICENSE("GPL"); |