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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file is part of UBIFS.
4 *
5 * Copyright (C) 2006-2008 Nokia Corporation.
6 * Copyright (C) 2006, 2007 University of Szeged, Hungary
7 *
8 * Authors: Adrian Hunter
9 * Artem Bityutskiy (Битюцкий Артём)
10 * Zoltan Sogor
11 */
12
13/*
14 * This file provides a single place to access to compression and
15 * decompression.
16 */
17
18#include <linux/crypto.h>
19#include "ubifs.h"
20
21/* Fake description object for the "none" compressor */
22static struct ubifs_compressor none_compr = {
23 .compr_type = UBIFS_COMPR_NONE,
24 .name = "none",
25 .capi_name = "",
26};
27
28#ifdef CONFIG_UBIFS_FS_LZO
29static DEFINE_MUTEX(lzo_mutex);
30
31static struct ubifs_compressor lzo_compr = {
32 .compr_type = UBIFS_COMPR_LZO,
33 .comp_mutex = &lzo_mutex,
34 .name = "lzo",
35 .capi_name = "lzo",
36};
37#else
38static struct ubifs_compressor lzo_compr = {
39 .compr_type = UBIFS_COMPR_LZO,
40 .name = "lzo",
41};
42#endif
43
44#ifdef CONFIG_UBIFS_FS_ZLIB
45static DEFINE_MUTEX(deflate_mutex);
46static DEFINE_MUTEX(inflate_mutex);
47
48static struct ubifs_compressor zlib_compr = {
49 .compr_type = UBIFS_COMPR_ZLIB,
50 .comp_mutex = &deflate_mutex,
51 .decomp_mutex = &inflate_mutex,
52 .name = "zlib",
53 .capi_name = "deflate",
54};
55#else
56static struct ubifs_compressor zlib_compr = {
57 .compr_type = UBIFS_COMPR_ZLIB,
58 .name = "zlib",
59};
60#endif
61
62#ifdef CONFIG_UBIFS_FS_ZSTD
63static DEFINE_MUTEX(zstd_enc_mutex);
64static DEFINE_MUTEX(zstd_dec_mutex);
65
66static struct ubifs_compressor zstd_compr = {
67 .compr_type = UBIFS_COMPR_ZSTD,
68 .comp_mutex = &zstd_enc_mutex,
69 .decomp_mutex = &zstd_dec_mutex,
70 .name = "zstd",
71 .capi_name = "zstd",
72};
73#else
74static struct ubifs_compressor zstd_compr = {
75 .compr_type = UBIFS_COMPR_ZSTD,
76 .name = "zstd",
77};
78#endif
79
80/* All UBIFS compressors */
81struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
82
83/**
84 * ubifs_compress - compress data.
85 * @in_buf: data to compress
86 * @in_len: length of the data to compress
87 * @out_buf: output buffer where compressed data should be stored
88 * @out_len: output buffer length is returned here
89 * @compr_type: type of compression to use on enter, actually used compression
90 * type on exit
91 *
92 * This function compresses input buffer @in_buf of length @in_len and stores
93 * the result in the output buffer @out_buf and the resulting length in
94 * @out_len. If the input buffer does not compress, it is just copied to the
95 * @out_buf. The same happens if @compr_type is %UBIFS_COMPR_NONE or if
96 * compression error occurred.
97 *
98 * Note, if the input buffer was not compressed, it is copied to the output
99 * buffer and %UBIFS_COMPR_NONE is returned in @compr_type.
100 */
101void ubifs_compress(const struct ubifs_info *c, const void *in_buf,
102 int in_len, void *out_buf, int *out_len, int *compr_type)
103{
104 int err;
105 struct ubifs_compressor *compr = ubifs_compressors[*compr_type];
106
107 if (*compr_type == UBIFS_COMPR_NONE)
108 goto no_compr;
109
110 /* If the input data is small, do not even try to compress it */
111 if (in_len < UBIFS_MIN_COMPR_LEN)
112 goto no_compr;
113
114 if (compr->comp_mutex)
115 mutex_lock(compr->comp_mutex);
116 err = crypto_comp_compress(compr->cc, in_buf, in_len, out_buf,
117 (unsigned int *)out_len);
118 if (compr->comp_mutex)
119 mutex_unlock(compr->comp_mutex);
120 if (unlikely(err)) {
121 ubifs_warn(c, "cannot compress %d bytes, compressor %s, error %d, leave data uncompressed",
122 in_len, compr->name, err);
123 goto no_compr;
124 }
125
126 /*
127 * If the data compressed only slightly, it is better to leave it
128 * uncompressed to improve read speed.
129 */
130 if (in_len - *out_len < UBIFS_MIN_COMPRESS_DIFF)
131 goto no_compr;
132
133 return;
134
135no_compr:
136 memcpy(out_buf, in_buf, in_len);
137 *out_len = in_len;
138 *compr_type = UBIFS_COMPR_NONE;
139}
140
141/**
142 * ubifs_decompress - decompress data.
143 * @in_buf: data to decompress
144 * @in_len: length of the data to decompress
145 * @out_buf: output buffer where decompressed data should
146 * @out_len: output length is returned here
147 * @compr_type: type of compression
148 *
149 * This function decompresses data from buffer @in_buf into buffer @out_buf.
150 * The length of the uncompressed data is returned in @out_len. This functions
151 * returns %0 on success or a negative error code on failure.
152 */
153int ubifs_decompress(const struct ubifs_info *c, const void *in_buf,
154 int in_len, void *out_buf, int *out_len, int compr_type)
155{
156 int err;
157 struct ubifs_compressor *compr;
158
159 if (unlikely(compr_type < 0 || compr_type >= UBIFS_COMPR_TYPES_CNT)) {
160 ubifs_err(c, "invalid compression type %d", compr_type);
161 return -EINVAL;
162 }
163
164 compr = ubifs_compressors[compr_type];
165
166 if (unlikely(!compr->capi_name)) {
167 ubifs_err(c, "%s compression is not compiled in", compr->name);
168 return -EINVAL;
169 }
170
171 if (compr_type == UBIFS_COMPR_NONE) {
172 memcpy(out_buf, in_buf, in_len);
173 *out_len = in_len;
174 return 0;
175 }
176
177 if (compr->decomp_mutex)
178 mutex_lock(compr->decomp_mutex);
179 err = crypto_comp_decompress(compr->cc, in_buf, in_len, out_buf,
180 (unsigned int *)out_len);
181 if (compr->decomp_mutex)
182 mutex_unlock(compr->decomp_mutex);
183 if (err)
184 ubifs_err(c, "cannot decompress %d bytes, compressor %s, error %d",
185 in_len, compr->name, err);
186
187 return err;
188}
189
190/**
191 * compr_init - initialize a compressor.
192 * @compr: compressor description object
193 *
194 * This function initializes the requested compressor and returns zero in case
195 * of success or a negative error code in case of failure.
196 */
197static int __init compr_init(struct ubifs_compressor *compr)
198{
199 if (compr->capi_name) {
200 compr->cc = crypto_alloc_comp(compr->capi_name, 0, 0);
201 if (IS_ERR(compr->cc)) {
202 pr_err("UBIFS error (pid %d): cannot initialize compressor %s, error %ld",
203 current->pid, compr->name, PTR_ERR(compr->cc));
204 return PTR_ERR(compr->cc);
205 }
206 }
207
208 ubifs_compressors[compr->compr_type] = compr;
209 return 0;
210}
211
212/**
213 * compr_exit - de-initialize a compressor.
214 * @compr: compressor description object
215 */
216static void compr_exit(struct ubifs_compressor *compr)
217{
218 if (compr->capi_name)
219 crypto_free_comp(compr->cc);
220 return;
221}
222
223/**
224 * ubifs_compressors_init - initialize UBIFS compressors.
225 *
226 * This function initializes the compressor which were compiled in. Returns
227 * zero in case of success and a negative error code in case of failure.
228 */
229int __init ubifs_compressors_init(void)
230{
231 int err;
232
233 err = compr_init(&lzo_compr);
234 if (err)
235 return err;
236
237 err = compr_init(&zstd_compr);
238 if (err)
239 goto out_lzo;
240
241 err = compr_init(&zlib_compr);
242 if (err)
243 goto out_zstd;
244
245 ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
246 return 0;
247
248out_zstd:
249 compr_exit(&zstd_compr);
250out_lzo:
251 compr_exit(&lzo_compr);
252 return err;
253}
254
255/**
256 * ubifs_compressors_exit - de-initialize UBIFS compressors.
257 */
258void ubifs_compressors_exit(void)
259{
260 compr_exit(&lzo_compr);
261 compr_exit(&zlib_compr);
262 compr_exit(&zstd_compr);
263}
1/*
2 * This file is part of UBIFS.
3 *
4 * Copyright (C) 2006-2008 Nokia Corporation.
5 * Copyright (C) 2006, 2007 University of Szeged, Hungary
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc., 51
18 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Authors: Adrian Hunter
21 * Artem Bityutskiy (Битюцкий Артём)
22 * Zoltan Sogor
23 */
24
25/*
26 * This file provides a single place to access to compression and
27 * decompression.
28 */
29
30#include <linux/crypto.h>
31#include "ubifs.h"
32
33/* Fake description object for the "none" compressor */
34static struct ubifs_compressor none_compr = {
35 .compr_type = UBIFS_COMPR_NONE,
36 .name = "none",
37 .capi_name = "",
38};
39
40#ifdef CONFIG_UBIFS_FS_LZO
41static DEFINE_MUTEX(lzo_mutex);
42
43static struct ubifs_compressor lzo_compr = {
44 .compr_type = UBIFS_COMPR_LZO,
45 .comp_mutex = &lzo_mutex,
46 .name = "lzo",
47 .capi_name = "lzo",
48};
49#else
50static struct ubifs_compressor lzo_compr = {
51 .compr_type = UBIFS_COMPR_LZO,
52 .name = "lzo",
53};
54#endif
55
56#ifdef CONFIG_UBIFS_FS_ZLIB
57static DEFINE_MUTEX(deflate_mutex);
58static DEFINE_MUTEX(inflate_mutex);
59
60static struct ubifs_compressor zlib_compr = {
61 .compr_type = UBIFS_COMPR_ZLIB,
62 .comp_mutex = &deflate_mutex,
63 .decomp_mutex = &inflate_mutex,
64 .name = "zlib",
65 .capi_name = "deflate",
66};
67#else
68static struct ubifs_compressor zlib_compr = {
69 .compr_type = UBIFS_COMPR_ZLIB,
70 .name = "zlib",
71};
72#endif
73
74/* All UBIFS compressors */
75struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
76
77/**
78 * ubifs_compress - compress data.
79 * @in_buf: data to compress
80 * @in_len: length of the data to compress
81 * @out_buf: output buffer where compressed data should be stored
82 * @out_len: output buffer length is returned here
83 * @compr_type: type of compression to use on enter, actually used compression
84 * type on exit
85 *
86 * This function compresses input buffer @in_buf of length @in_len and stores
87 * the result in the output buffer @out_buf and the resulting length in
88 * @out_len. If the input buffer does not compress, it is just copied to the
89 * @out_buf. The same happens if @compr_type is %UBIFS_COMPR_NONE or if
90 * compression error occurred.
91 *
92 * Note, if the input buffer was not compressed, it is copied to the output
93 * buffer and %UBIFS_COMPR_NONE is returned in @compr_type.
94 */
95void ubifs_compress(const struct ubifs_info *c, const void *in_buf,
96 int in_len, void *out_buf, int *out_len, int *compr_type)
97{
98 int err;
99 struct ubifs_compressor *compr = ubifs_compressors[*compr_type];
100
101 if (*compr_type == UBIFS_COMPR_NONE)
102 goto no_compr;
103
104 /* If the input data is small, do not even try to compress it */
105 if (in_len < UBIFS_MIN_COMPR_LEN)
106 goto no_compr;
107
108 if (compr->comp_mutex)
109 mutex_lock(compr->comp_mutex);
110 err = crypto_comp_compress(compr->cc, in_buf, in_len, out_buf,
111 (unsigned int *)out_len);
112 if (compr->comp_mutex)
113 mutex_unlock(compr->comp_mutex);
114 if (unlikely(err)) {
115 ubifs_warn(c, "cannot compress %d bytes, compressor %s, error %d, leave data uncompressed",
116 in_len, compr->name, err);
117 goto no_compr;
118 }
119
120 /*
121 * If the data compressed only slightly, it is better to leave it
122 * uncompressed to improve read speed.
123 */
124 if (in_len - *out_len < UBIFS_MIN_COMPRESS_DIFF)
125 goto no_compr;
126
127 return;
128
129no_compr:
130 memcpy(out_buf, in_buf, in_len);
131 *out_len = in_len;
132 *compr_type = UBIFS_COMPR_NONE;
133}
134
135/**
136 * ubifs_decompress - decompress data.
137 * @in_buf: data to decompress
138 * @in_len: length of the data to decompress
139 * @out_buf: output buffer where decompressed data should
140 * @out_len: output length is returned here
141 * @compr_type: type of compression
142 *
143 * This function decompresses data from buffer @in_buf into buffer @out_buf.
144 * The length of the uncompressed data is returned in @out_len. This functions
145 * returns %0 on success or a negative error code on failure.
146 */
147int ubifs_decompress(const struct ubifs_info *c, const void *in_buf,
148 int in_len, void *out_buf, int *out_len, int compr_type)
149{
150 int err;
151 struct ubifs_compressor *compr;
152
153 if (unlikely(compr_type < 0 || compr_type >= UBIFS_COMPR_TYPES_CNT)) {
154 ubifs_err(c, "invalid compression type %d", compr_type);
155 return -EINVAL;
156 }
157
158 compr = ubifs_compressors[compr_type];
159
160 if (unlikely(!compr->capi_name)) {
161 ubifs_err(c, "%s compression is not compiled in", compr->name);
162 return -EINVAL;
163 }
164
165 if (compr_type == UBIFS_COMPR_NONE) {
166 memcpy(out_buf, in_buf, in_len);
167 *out_len = in_len;
168 return 0;
169 }
170
171 if (compr->decomp_mutex)
172 mutex_lock(compr->decomp_mutex);
173 err = crypto_comp_decompress(compr->cc, in_buf, in_len, out_buf,
174 (unsigned int *)out_len);
175 if (compr->decomp_mutex)
176 mutex_unlock(compr->decomp_mutex);
177 if (err)
178 ubifs_err(c, "cannot decompress %d bytes, compressor %s, error %d",
179 in_len, compr->name, err);
180
181 return err;
182}
183
184/**
185 * compr_init - initialize a compressor.
186 * @compr: compressor description object
187 *
188 * This function initializes the requested compressor and returns zero in case
189 * of success or a negative error code in case of failure.
190 */
191static int __init compr_init(struct ubifs_compressor *compr)
192{
193 if (compr->capi_name) {
194 compr->cc = crypto_alloc_comp(compr->capi_name, 0, 0);
195 if (IS_ERR(compr->cc)) {
196 pr_err("UBIFS error (pid %d): cannot initialize compressor %s, error %ld",
197 current->pid, compr->name, PTR_ERR(compr->cc));
198 return PTR_ERR(compr->cc);
199 }
200 }
201
202 ubifs_compressors[compr->compr_type] = compr;
203 return 0;
204}
205
206/**
207 * compr_exit - de-initialize a compressor.
208 * @compr: compressor description object
209 */
210static void compr_exit(struct ubifs_compressor *compr)
211{
212 if (compr->capi_name)
213 crypto_free_comp(compr->cc);
214 return;
215}
216
217/**
218 * ubifs_compressors_init - initialize UBIFS compressors.
219 *
220 * This function initializes the compressor which were compiled in. Returns
221 * zero in case of success and a negative error code in case of failure.
222 */
223int __init ubifs_compressors_init(void)
224{
225 int err;
226
227 err = compr_init(&lzo_compr);
228 if (err)
229 return err;
230
231 err = compr_init(&zlib_compr);
232 if (err)
233 goto out_lzo;
234
235 ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
236 return 0;
237
238out_lzo:
239 compr_exit(&lzo_compr);
240 return err;
241}
242
243/**
244 * ubifs_compressors_exit - de-initialize UBIFS compressors.
245 */
246void ubifs_compressors_exit(void)
247{
248 compr_exit(&lzo_compr);
249 compr_exit(&zlib_compr);
250}