1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26 /*
27 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
28 */
29
30 /*
31 * Copyright (c) 2013 by Delphix. All rights reserved.
32 */
33
34 #include <sys/zfs_context.h>
35 #include <sys/compress.h>
36 #include <sys/spa.h>
37 #include <sys/zfeature.h>
38 #include <sys/zio.h>
39 #include <sys/zio_compress.h>
40
41 /*
42 * Compression vectors.
43 */
44
45 zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS] = {
46 {NULL, NULL, 0, "inherit"},
47 {NULL, NULL, 0, "on"},
48 {NULL, NULL, 0, "uncompressed"},
49 {lzjb_compress, lzjb_decompress, 0, "lzjb"},
50 {NULL, NULL, 0, "empty"},
51 {gzip_compress, gzip_decompress, 1, "gzip-1"},
52 {gzip_compress, gzip_decompress, 2, "gzip-2"},
53 {gzip_compress, gzip_decompress, 3, "gzip-3"},
54 {gzip_compress, gzip_decompress, 4, "gzip-4"},
55 {gzip_compress, gzip_decompress, 5, "gzip-5"},
56 {gzip_compress, gzip_decompress, 6, "gzip-6"},
57 {gzip_compress, gzip_decompress, 7, "gzip-7"},
58 {gzip_compress, gzip_decompress, 8, "gzip-8"},
59 {gzip_compress, gzip_decompress, 9, "gzip-9"},
60 {zle_compress, zle_decompress, 64, "zle"},
61 {lz4_compress, lz4_decompress, 0, "lz4"},
62 };
63
64 enum zio_compress
zio_compress_select(spa_t * spa,enum zio_compress child,enum zio_compress parent)65 zio_compress_select(spa_t *spa, enum zio_compress child,
66 enum zio_compress parent)
67 {
68 enum zio_compress result;
69
70 ASSERT(child < ZIO_COMPRESS_FUNCTIONS);
71 ASSERT(parent < ZIO_COMPRESS_FUNCTIONS);
72 ASSERT(parent != ZIO_COMPRESS_INHERIT);
73
74 result = child;
75 if (result == ZIO_COMPRESS_INHERIT)
76 result = parent;
77
78 if (result == ZIO_COMPRESS_ON) {
79 if (spa_feature_is_active(spa, SPA_FEATURE_LZ4_COMPRESS))
80 result = ZIO_COMPRESS_LZ4_ON_VALUE;
81 else
82 result = ZIO_COMPRESS_LEGACY_ON_VALUE;
83 }
84
85 return (result);
86 }
87
88 size_t
zio_compress_data(enum zio_compress c,void * src,void * dst,size_t s_len)89 zio_compress_data(enum zio_compress c, void *src, void *dst, size_t s_len)
90 {
91 uint64_t *word, *word_end;
92 size_t c_len, d_len;
93 zio_compress_info_t *ci = &zio_compress_table[c];
94
95 ASSERT((uint_t)c < ZIO_COMPRESS_FUNCTIONS);
96 ASSERT((uint_t)c == ZIO_COMPRESS_EMPTY || ci->ci_compress != NULL);
97
98 /*
99 * If the data is all zeroes, we don't even need to allocate
100 * a block for it. We indicate this by returning zero size.
101 */
102 word_end = (uint64_t *)((char *)src + s_len);
103 for (word = src; word < word_end; word++)
104 if (*word != 0)
105 break;
106
107 if (word == word_end)
108 return (0);
109
110 if (c == ZIO_COMPRESS_EMPTY)
111 return (s_len);
112
113 /* Compress at least 12.5% */
114 d_len = s_len - (s_len >> 3);
115 c_len = ci->ci_compress(src, dst, s_len, d_len, ci->ci_level);
116
117 if (c_len > d_len)
118 return (s_len);
119
120 ASSERT3U(c_len, <=, d_len);
121 return (c_len);
122 }
123
124 int
zio_decompress_data(enum zio_compress c,void * src,void * dst,size_t s_len,size_t d_len)125 zio_decompress_data(enum zio_compress c, void *src, void *dst,
126 size_t s_len, size_t d_len)
127 {
128 zio_compress_info_t *ci = &zio_compress_table[c];
129
130 if ((uint_t)c >= ZIO_COMPRESS_FUNCTIONS || ci->ci_decompress == NULL)
131 return (SET_ERROR(EINVAL));
132
133 return (ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level));
134 }
135