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34dc7c2f BB |
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 | /* | |
428870ff | 23 | * Copyright 2009 Sun Microsystems, Inc. All rights reserved. |
34dc7c2f BB |
24 | * Use is subject to license terms. |
25 | */ | |
26 | ||
34dc7c2f BB |
27 | #include <sys/zfs_context.h> |
28 | #include <sys/compress.h> | |
29 | #include <sys/spa.h> | |
30 | #include <sys/zio.h> | |
31 | #include <sys/zio_compress.h> | |
32 | ||
33 | /* | |
34 | * Compression vectors. | |
35 | */ | |
36 | ||
37 | zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS] = { | |
38 | {NULL, NULL, 0, "inherit"}, | |
39 | {NULL, NULL, 0, "on"}, | |
40 | {NULL, NULL, 0, "uncompressed"}, | |
41 | {lzjb_compress, lzjb_decompress, 0, "lzjb"}, | |
42 | {NULL, NULL, 0, "empty"}, | |
43 | {gzip_compress, gzip_decompress, 1, "gzip-1"}, | |
44 | {gzip_compress, gzip_decompress, 2, "gzip-2"}, | |
45 | {gzip_compress, gzip_decompress, 3, "gzip-3"}, | |
46 | {gzip_compress, gzip_decompress, 4, "gzip-4"}, | |
47 | {gzip_compress, gzip_decompress, 5, "gzip-5"}, | |
48 | {gzip_compress, gzip_decompress, 6, "gzip-6"}, | |
49 | {gzip_compress, gzip_decompress, 7, "gzip-7"}, | |
50 | {gzip_compress, gzip_decompress, 8, "gzip-8"}, | |
51 | {gzip_compress, gzip_decompress, 9, "gzip-9"}, | |
428870ff | 52 | {zle_compress, zle_decompress, 64, "zle"}, |
34dc7c2f BB |
53 | }; |
54 | ||
428870ff BB |
55 | enum zio_compress |
56 | zio_compress_select(enum zio_compress child, enum zio_compress parent) | |
34dc7c2f BB |
57 | { |
58 | ASSERT(child < ZIO_COMPRESS_FUNCTIONS); | |
59 | ASSERT(parent < ZIO_COMPRESS_FUNCTIONS); | |
60 | ASSERT(parent != ZIO_COMPRESS_INHERIT && parent != ZIO_COMPRESS_ON); | |
61 | ||
62 | if (child == ZIO_COMPRESS_INHERIT) | |
63 | return (parent); | |
64 | ||
65 | if (child == ZIO_COMPRESS_ON) | |
66 | return (ZIO_COMPRESS_ON_VALUE); | |
67 | ||
68 | return (child); | |
69 | } | |
70 | ||
428870ff BB |
71 | size_t |
72 | zio_compress_data(enum zio_compress c, void *src, void *dst, size_t s_len) | |
34dc7c2f BB |
73 | { |
74 | uint64_t *word, *word_end; | |
428870ff BB |
75 | size_t c_len, d_len, r_len; |
76 | zio_compress_info_t *ci = &zio_compress_table[c]; | |
34dc7c2f | 77 | |
428870ff BB |
78 | ASSERT((uint_t)c < ZIO_COMPRESS_FUNCTIONS); |
79 | ASSERT((uint_t)c == ZIO_COMPRESS_EMPTY || ci->ci_compress != NULL); | |
34dc7c2f BB |
80 | |
81 | /* | |
82 | * If the data is all zeroes, we don't even need to allocate | |
428870ff | 83 | * a block for it. We indicate this by returning zero size. |
34dc7c2f | 84 | */ |
428870ff BB |
85 | word_end = (uint64_t *)((char *)src + s_len); |
86 | for (word = src; word < word_end; word++) | |
87 | if (*word != 0) | |
34dc7c2f | 88 | break; |
34dc7c2f | 89 | |
428870ff | 90 | if (word == word_end) |
34dc7c2f BB |
91 | return (0); |
92 | ||
428870ff BB |
93 | if (c == ZIO_COMPRESS_EMPTY) |
94 | return (s_len); | |
95 | ||
34dc7c2f | 96 | /* Compress at least 12.5% */ |
428870ff BB |
97 | d_len = P2ALIGN(s_len - (s_len >> 3), (size_t)SPA_MINBLOCKSIZE); |
98 | if (d_len == 0) | |
99 | return (s_len); | |
34dc7c2f | 100 | |
428870ff | 101 | c_len = ci->ci_compress(src, dst, s_len, d_len, ci->ci_level); |
34dc7c2f | 102 | |
428870ff BB |
103 | if (c_len > d_len) |
104 | return (s_len); | |
34dc7c2f | 105 | |
428870ff BB |
106 | /* |
107 | * Cool. We compressed at least as much as we were hoping to. | |
108 | * For both security and repeatability, pad out the last sector. | |
109 | */ | |
110 | r_len = P2ROUNDUP(c_len, (size_t)SPA_MINBLOCKSIZE); | |
111 | if (r_len > c_len) { | |
112 | bzero((char *)dst + c_len, r_len - c_len); | |
113 | c_len = r_len; | |
34dc7c2f BB |
114 | } |
115 | ||
428870ff BB |
116 | ASSERT3U(c_len, <=, d_len); |
117 | ASSERT(P2PHASE(c_len, (size_t)SPA_MINBLOCKSIZE) == 0); | |
34dc7c2f | 118 | |
428870ff | 119 | return (c_len); |
34dc7c2f BB |
120 | } |
121 | ||
122 | int | |
428870ff BB |
123 | zio_decompress_data(enum zio_compress c, void *src, void *dst, |
124 | size_t s_len, size_t d_len) | |
34dc7c2f | 125 | { |
428870ff | 126 | zio_compress_info_t *ci = &zio_compress_table[c]; |
34dc7c2f | 127 | |
428870ff BB |
128 | if ((uint_t)c >= ZIO_COMPRESS_FUNCTIONS || ci->ci_decompress == NULL) |
129 | return (EINVAL); | |
34dc7c2f | 130 | |
428870ff | 131 | return (ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level)); |
34dc7c2f | 132 | } |