1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18#include <linux/crypto.h>
19#include "ubifs.h"
20
21
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
81struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
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
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
128
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
143
144
145
146
147
148
149
150
151
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
192
193
194
195
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
214
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
225
226
227
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
257
258void ubifs_compressors_exit(void)
259{
260 compr_exit(&lzo_compr);
261 compr_exit(&zlib_compr);
262 compr_exit(&zstd_compr);
263}
264