[thirdparty/kernel/stable.git] / crypto / scompress.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Synchronous Compression operations
 *
 * Copyright 2015 LG Electronics Inc.
 * Copyright (c) 2016, Intel Corporation
 * Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
 */

#include <crypto/internal/acompress.h>
#include <crypto/internal/scompress.h>
#include <crypto/scatterwalk.h>
#include <linux/cryptouser.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <net/netlink.h>

#include "compress.h"

struct scomp_scratch {
	spinlock_t	lock;
	void		*src;
	void		*dst;
};

static DEFINE_PER_CPU(struct scomp_scratch, scomp_scratch) = {
	.lock = __SPIN_LOCK_UNLOCKED(scomp_scratch.lock),
};

static const struct crypto_type crypto_scomp_type;
static int scomp_scratch_users;
static DEFINE_MUTEX(scomp_lock);

static int __maybe_unused crypto_scomp_report(
	struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_comp rscomp;

	memset(&rscomp, 0, sizeof(rscomp));

	strscpy(rscomp.type, "scomp", sizeof(rscomp.type));

	return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
		       sizeof(rscomp), &rscomp);
}

static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
	__maybe_unused;

static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
{
	seq_puts(m, "type         : scomp\n");
}

static void crypto_scomp_free_scratches(void)
{
	struct scomp_scratch *scratch;
	int i;

	for_each_possible_cpu(i) {
		scratch = per_cpu_ptr(&scomp_scratch, i);

		vfree(scratch->src);
		vfree(scratch->dst);
		scratch->src = NULL;
		scratch->dst = NULL;
	}
}

static int crypto_scomp_alloc_scratches(void)
{
	struct scomp_scratch *scratch;
	int i;

	for_each_possible_cpu(i) {
		void *mem;

		scratch = per_cpu_ptr(&scomp_scratch, i);

		mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
		if (!mem)
			goto error;
		scratch->src = mem;
		mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
		if (!mem)
			goto error;
		scratch->dst = mem;
	}
	return 0;
error:
	crypto_scomp_free_scratches();
	return -ENOMEM;
}

static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
{
	int ret = 0;

	mutex_lock(&scomp_lock);
	if (!scomp_scratch_users++)
		ret = crypto_scomp_alloc_scratches();
	mutex_unlock(&scomp_lock);

	return ret;
}

static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
{
	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
	void **tfm_ctx = acomp_tfm_ctx(tfm);
	struct crypto_scomp *scomp = *tfm_ctx;
	void **ctx = acomp_request_ctx(req);
	struct scomp_scratch *scratch;
	void *src, *dst;
	unsigned int dlen;
	int ret;

	if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE)
		return -EINVAL;

	if (req->dst && !req->dlen)
		return -EINVAL;

	if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
		req->dlen = SCOMP_SCRATCH_SIZE;

	dlen = req->dlen;

	scratch = raw_cpu_ptr(&scomp_scratch);
	spin_lock(&scratch->lock);

	if (sg_nents(req->src) == 1 && !PageHighMem(sg_page(req->src))) {
		src = page_to_virt(sg_page(req->src)) + req->src->offset;
	} else {
		scatterwalk_map_and_copy(scratch->src, req->src, 0,
					 req->slen, 0);
		src = scratch->src;
	}

	if (req->dst && sg_nents(req->dst) == 1 && !PageHighMem(sg_page(req->dst)))
		dst = page_to_virt(sg_page(req->dst)) + req->dst->offset;
	else
		dst = scratch->dst;

	if (dir)
		ret = crypto_scomp_compress(scomp, src, req->slen,
					    dst, &req->dlen, *ctx);
	else
		ret = crypto_scomp_decompress(scomp, src, req->slen,
					      dst, &req->dlen, *ctx);
	if (!ret) {
		if (!req->dst) {
			req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
			if (!req->dst) {
				ret = -ENOMEM;
				goto out;
			}
		} else if (req->dlen > dlen) {
			ret = -ENOSPC;
			goto out;
		}
		if (dst == scratch->dst) {
			scatterwalk_map_and_copy(scratch->dst, req->dst, 0,
						 req->dlen, 1);
		} else {
			int nr_pages = DIV_ROUND_UP(req->dst->offset + req->dlen, PAGE_SIZE);
			int i;
			struct page *dst_page = sg_page(req->dst);

			for (i = 0; i < nr_pages; i++)
				flush_dcache_page(dst_page + i);
		}
	}
out:
	spin_unlock(&scratch->lock);
	return ret;
}

static int scomp_acomp_compress(struct acomp_req *req)
{
	return scomp_acomp_comp_decomp(req, 1);
}

static int scomp_acomp_decompress(struct acomp_req *req)
{
	return scomp_acomp_comp_decomp(req, 0);
}

static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
{
	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);

	crypto_free_scomp(*ctx);

	mutex_lock(&scomp_lock);
	if (!--scomp_scratch_users)
		crypto_scomp_free_scratches();
	mutex_unlock(&scomp_lock);
}

int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
{
	struct crypto_alg *calg = tfm->__crt_alg;
	struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
	struct crypto_scomp *scomp;

	if (!crypto_mod_get(calg))
		return -EAGAIN;

	scomp = crypto_create_tfm(calg, &crypto_scomp_type);
	if (IS_ERR(scomp)) {
		crypto_mod_put(calg);
		return PTR_ERR(scomp);
	}

	*ctx = scomp;
	tfm->exit = crypto_exit_scomp_ops_async;

	crt->compress = scomp_acomp_compress;
	crt->decompress = scomp_acomp_decompress;
	crt->dst_free = sgl_free;
	crt->reqsize = sizeof(void *);

	return 0;
}

struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
{
	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
	struct crypto_scomp *scomp = *tfm_ctx;
	void *ctx;

	ctx = crypto_scomp_alloc_ctx(scomp);
	if (IS_ERR(ctx)) {
		kfree(req);
		return NULL;
	}

	*req->__ctx = ctx;

	return req;
}

void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
{
	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
	struct crypto_scomp *scomp = *tfm_ctx;
	void *ctx = *req->__ctx;

	if (ctx)
		crypto_scomp_free_ctx(scomp, ctx);
}

static const struct crypto_type crypto_scomp_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_scomp_init_tfm,
#ifdef CONFIG_PROC_FS
	.show = crypto_scomp_show,
#endif
#if IS_ENABLED(CONFIG_CRYPTO_USER)
	.report = crypto_scomp_report,
#endif
#ifdef CONFIG_CRYPTO_STATS
	.report_stat = crypto_acomp_report_stat,
#endif
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_SCOMPRESS,
	.tfmsize = offsetof(struct crypto_scomp, base),
};

int crypto_register_scomp(struct scomp_alg *alg)
{
	struct crypto_alg *base = &alg->calg.base;

	comp_prepare_alg(&alg->calg);

	base->cra_type = &crypto_scomp_type;
	base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;

	return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_scomp);

void crypto_unregister_scomp(struct scomp_alg *alg)
{
	crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_scomp);

int crypto_register_scomps(struct scomp_alg *algs, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		ret = crypto_register_scomp(&algs[i]);
		if (ret)
			goto err;
	}

	return 0;

err:
	for (--i; i >= 0; --i)
		crypto_unregister_scomp(&algs[i]);

	return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_scomps);

void crypto_unregister_scomps(struct scomp_alg *algs, int count)
{
	int i;

	for (i = count - 1; i >= 0; --i)
		crypto_unregister_scomp(&algs[i]);
}
EXPORT_SYMBOL_GPL(crypto_unregister_scomps);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Synchronous compression type");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1ab53a77 GC	2	/*
	3	* Synchronous Compression operations
	4	*
	5	* Copyright 2015 LG Electronics Inc.
	6	* Copyright (c) 2016, Intel Corporation
	7	* Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
1ab53a77	8	*/
0a742389 HX	9
	10	#include <crypto/internal/acompress.h>
	11	#include <crypto/internal/scompress.h>
	12	#include <crypto/scatterwalk.h>
	13	#include <linux/cryptouser.h>
	14	#include <linux/err.h>
1ab53a77 GC	15	#include <linux/kernel.h>
1ab53a77 GC	16	#include <linux/module.h>
0a742389	17	#include <linux/scatterlist.h>
1ab53a77 GC	18	#include <linux/seq_file.h>
	19	#include <linux/slab.h>
	20	#include <linux/string.h>
1ab53a77	21	#include <linux/vmalloc.h>
1ab53a77	22	#include <net/netlink.h>
0a742389 HX	23
0a742389 HX	24	#include "compress.h"
1ab53a77	25
71052dcf SAS	26	struct scomp_scratch {
	27	spinlock_t lock;
	28	void *src;
	29	void *dst;
	30	};
	31
	32	static DEFINE_PER_CPU(struct scomp_scratch, scomp_scratch) = {
	33	.lock = __SPIN_LOCK_UNLOCKED(scomp_scratch.lock),
	34	};
	35
1ab53a77	36	static const struct crypto_type crypto_scomp_type;
1ab53a77 GC	37	static int scomp_scratch_users;
	38	static DEFINE_MUTEX(scomp_lock);
	39
c0f9e01d HX	40	static int __maybe_unused crypto_scomp_report(
c0f9e01d HX	41	struct sk_buff skb, struct crypto_alg alg)
1ab53a77 GC	42	{
	43	struct crypto_report_comp rscomp;
	44
37db69e0	45	memset(&rscomp, 0, sizeof(rscomp));
1ab53a77	46
37db69e0	47	strscpy(rscomp.type, "scomp", sizeof(rscomp.type));
1ab53a77	48
37db69e0 EB	49	return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
37db69e0 EB	50	sizeof(rscomp), &rscomp);
1ab53a77	51	}
1ab53a77 GC	52
1ab53a77 GC	53	static void crypto_scomp_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	54	__maybe_unused;
1ab53a77 GC	55
	56	static void crypto_scomp_show(struct seq_file m, struct crypto_alg alg)
	57	{
	58	seq_puts(m, "type : scomp\n");
	59	}
	60
71052dcf	61	static void crypto_scomp_free_scratches(void)
1ab53a77	62	{
71052dcf	63	struct scomp_scratch *scratch;
1ab53a77 GC	64	int i;
1ab53a77 GC	65
71052dcf	66	for_each_possible_cpu(i) {
8c3fffe3	67	scratch = per_cpu_ptr(&scomp_scratch, i);
1ab53a77	68
71052dcf SAS	69	vfree(scratch->src);
	70	vfree(scratch->dst);
	71	scratch->src = NULL;
	72	scratch->dst = NULL;
	73	}
1ab53a77 GC	74	}
1ab53a77 GC	75
71052dcf	76	static int crypto_scomp_alloc_scratches(void)
1ab53a77	77	{
71052dcf	78	struct scomp_scratch *scratch;
1ab53a77 GC	79	int i;
1ab53a77 GC	80
1ab53a77	81	for_each_possible_cpu(i) {
71052dcf	82	void *mem;
1ab53a77	83
8c3fffe3	84	scratch = per_cpu_ptr(&scomp_scratch, i);
1ab53a77	85
71052dcf SAS	86	mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
	87	if (!mem)
	88	goto error;
	89	scratch->src = mem;
	90	mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
	91	if (!mem)
	92	goto error;
	93	scratch->dst = mem;
1ab53a77 GC	94	}
1ab53a77 GC	95	return 0;
71052dcf SAS	96	error:
	97	crypto_scomp_free_scratches();
	98	return -ENOMEM;
1ab53a77 GC	99	}
1ab53a77 GC	100
6a8487a1 AB	101	static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
6a8487a1 AB	102	{
71052dcf	103	int ret = 0;
6a8487a1 AB	104
6a8487a1 AB	105	mutex_lock(&scomp_lock);
71052dcf SAS	106	if (!scomp_scratch_users++)
71052dcf SAS	107	ret = crypto_scomp_alloc_scratches();
6a8487a1 AB	108	mutex_unlock(&scomp_lock);
	109
	110	return ret;
	111	}
	112
1ab53a77 GC	113	static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
	114	{
	115	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
	116	void **tfm_ctx = acomp_tfm_ctx(tfm);
	117	struct crypto_scomp scomp = tfm_ctx;
	118	void **ctx = acomp_request_ctx(req);
71052dcf	119	struct scomp_scratch *scratch;
77292bb8	120	void src, dst;
744e1885	121	unsigned int dlen;
1ab53a77 GC	122	int ret;
1ab53a77 GC	123
71052dcf SAS	124	if (!req->src \|\| !req->slen \|\| req->slen > SCOMP_SCRATCH_SIZE)
71052dcf SAS	125	return -EINVAL;
1ab53a77	126
71052dcf SAS	127	if (req->dst && !req->dlen)
71052dcf SAS	128	return -EINVAL;
1ab53a77 GC	129
	130	if (!req->dlen \|\| req->dlen > SCOMP_SCRATCH_SIZE)
	131	req->dlen = SCOMP_SCRATCH_SIZE;
	132
744e1885 CZ	133	dlen = req->dlen;
744e1885 CZ	134
71052dcf SAS	135	scratch = raw_cpu_ptr(&scomp_scratch);
	136	spin_lock(&scratch->lock);
	137
77292bb8 BS	138	if (sg_nents(req->src) == 1 && !PageHighMem(sg_page(req->src))) {
	139	src = page_to_virt(sg_page(req->src)) + req->src->offset;
	140	} else {
	141	scatterwalk_map_and_copy(scratch->src, req->src, 0,
	142	req->slen, 0);
	143	src = scratch->src;
	144	}
	145
	146	if (req->dst && sg_nents(req->dst) == 1 && !PageHighMem(sg_page(req->dst)))
	147	dst = page_to_virt(sg_page(req->dst)) + req->dst->offset;
	148	else
	149	dst = scratch->dst;
	150
1ab53a77	151	if (dir)
77292bb8 BS	152	ret = crypto_scomp_compress(scomp, src, req->slen,
77292bb8 BS	153	dst, &req->dlen, *ctx);
1ab53a77	154	else
77292bb8 BS	155	ret = crypto_scomp_decompress(scomp, src, req->slen,
77292bb8 BS	156	dst, &req->dlen, *ctx);
1ab53a77 GC	157	if (!ret) {
1ab53a77 GC	158	if (!req->dst) {
8cd579d2	159	req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
6a4d1b18 SAS	160	if (!req->dst) {
6a4d1b18 SAS	161	ret = -ENOMEM;
1ab53a77	162	goto out;
6a4d1b18	163	}
744e1885 CZ	164	} else if (req->dlen > dlen) {
	165	ret = -ENOSPC;
	166	goto out;
1ab53a77	167	}
77292bb8 BS	168	if (dst == scratch->dst) {
	169	scatterwalk_map_and_copy(scratch->dst, req->dst, 0,
	170	req->dlen, 1);
	171	} else {
	172	int nr_pages = DIV_ROUND_UP(req->dst->offset + req->dlen, PAGE_SIZE);
	173	int i;
	174	struct page *dst_page = sg_page(req->dst);
	175
	176	for (i = 0; i < nr_pages; i++)
	177	flush_dcache_page(dst_page + i);
	178	}
1ab53a77 GC	179	}
1ab53a77 GC	180	out:
71052dcf	181	spin_unlock(&scratch->lock);
1ab53a77 GC	182	return ret;
	183	}
	184
	185	static int scomp_acomp_compress(struct acomp_req *req)
	186	{
	187	return scomp_acomp_comp_decomp(req, 1);
	188	}
	189
	190	static int scomp_acomp_decompress(struct acomp_req *req)
	191	{
	192	return scomp_acomp_comp_decomp(req, 0);
	193	}
	194
	195	static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
	196	{
	197	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
	198
	199	crypto_free_scomp(*ctx);
6a8487a1 AB	200
6a8487a1 AB	201	mutex_lock(&scomp_lock);
71052dcf SAS	202	if (!--scomp_scratch_users)
71052dcf SAS	203	crypto_scomp_free_scratches();
6a8487a1	204	mutex_unlock(&scomp_lock);
1ab53a77 GC	205	}
	206
	207	int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
	208	{
	209	struct crypto_alg *calg = tfm->__crt_alg;
	210	struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
	211	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
	212	struct crypto_scomp *scomp;
	213
	214	if (!crypto_mod_get(calg))
	215	return -EAGAIN;
	216
	217	scomp = crypto_create_tfm(calg, &crypto_scomp_type);
	218	if (IS_ERR(scomp)) {
	219	crypto_mod_put(calg);
	220	return PTR_ERR(scomp);
	221	}
	222
	223	*ctx = scomp;
	224	tfm->exit = crypto_exit_scomp_ops_async;
	225
	226	crt->compress = scomp_acomp_compress;
	227	crt->decompress = scomp_acomp_decompress;
8cd579d2	228	crt->dst_free = sgl_free;
1ab53a77 GC	229	crt->reqsize = sizeof(void *);
	230
	231	return 0;
	232	}
	233
	234	struct acomp_req crypto_acomp_scomp_alloc_ctx(struct acomp_req req)
	235	{
	236	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	237	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	238	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
	239	struct crypto_scomp scomp = tfm_ctx;
	240	void *ctx;
	241
	242	ctx = crypto_scomp_alloc_ctx(scomp);
	243	if (IS_ERR(ctx)) {
	244	kfree(req);
	245	return NULL;
	246	}
	247
	248	*req->__ctx = ctx;
	249
	250	return req;
	251	}
	252
	253	void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
	254	{
	255	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	256	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	257	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
	258	struct crypto_scomp scomp = tfm_ctx;
	259	void ctx = req->__ctx;
	260
	261	if (ctx)
	262	crypto_scomp_free_ctx(scomp, ctx);
	263	}
	264
	265	static const struct crypto_type crypto_scomp_type = {
	266	.extsize = crypto_alg_extsize,
	267	.init_tfm = crypto_scomp_init_tfm,
	268	#ifdef CONFIG_PROC_FS
	269	.show = crypto_scomp_show,
	270	#endif
b8969a1b	271	#if IS_ENABLED(CONFIG_CRYPTO_USER)
1ab53a77	272	.report = crypto_scomp_report,
6a8dbd71 HX	273	#endif
	274	#ifdef CONFIG_CRYPTO_STATS
	275	.report_stat = crypto_acomp_report_stat,
0a742389	276	#endif
1ab53a77 GC	277	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	278	.maskset = CRYPTO_ALG_TYPE_MASK,
	279	.type = CRYPTO_ALG_TYPE_SCOMPRESS,
	280	.tfmsize = offsetof(struct crypto_scomp, base),
	281	};
	282
	283	int crypto_register_scomp(struct scomp_alg *alg)
	284	{
6a8dbd71 HX	285	struct crypto_alg *base = &alg->calg.base;
	286
	287	comp_prepare_alg(&alg->calg);
1ab53a77 GC	288
1ab53a77 GC	289	base->cra_type = &crypto_scomp_type;
1ab53a77 GC	290	base->cra_flags \|= CRYPTO_ALG_TYPE_SCOMPRESS;
1ab53a77 GC	291
6a8487a1	292	return crypto_register_alg(base);
1ab53a77 GC	293	}
	294	EXPORT_SYMBOL_GPL(crypto_register_scomp);
	295
c6d633a9	296	void crypto_unregister_scomp(struct scomp_alg *alg)
1ab53a77	297	{
c6d633a9	298	crypto_unregister_alg(&alg->base);
1ab53a77 GC	299	}
	300	EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
	301
3de4f5e1 GC	302	int crypto_register_scomps(struct scomp_alg *algs, int count)
	303	{
	304	int i, ret;
	305
	306	for (i = 0; i < count; i++) {
	307	ret = crypto_register_scomp(&algs[i]);
	308	if (ret)
	309	goto err;
	310	}
	311
	312	return 0;
	313
	314	err:
	315	for (--i; i >= 0; --i)
	316	crypto_unregister_scomp(&algs[i]);
	317
	318	return ret;
	319	}
	320	EXPORT_SYMBOL_GPL(crypto_register_scomps);
	321
	322	void crypto_unregister_scomps(struct scomp_alg *algs, int count)
	323	{
	324	int i;
	325
	326	for (i = count - 1; i >= 0; --i)
	327	crypto_unregister_scomp(&algs[i]);
	328	}
	329	EXPORT_SYMBOL_GPL(crypto_unregister_scomps);
	330
1ab53a77 GC	331	MODULE_LICENSE("GPL");
1ab53a77 GC	332	MODULE_DESCRIPTION("Synchronous compression type");