1fa9e4066Sahrens /*
2fa9e4066Sahrens * CDDL HEADER START
3fa9e4066Sahrens *
4fa9e4066Sahrens * The contents of this file are subject to the terms of the
55ad82045Snd150628 * Common Development and Distribution License (the "License").
65ad82045Snd150628 * You may not use this file except in compliance with the License.
7fa9e4066Sahrens *
8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing.
10fa9e4066Sahrens * See the License for the specific language governing permissions
11fa9e4066Sahrens * and limitations under the License.
12fa9e4066Sahrens *
13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each
14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the
16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying
17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner]
18fa9e4066Sahrens *
19fa9e4066Sahrens * CDDL HEADER END
20fa9e4066Sahrens */
21c9431fa1Sahl
22fa9e4066Sahrens /*
23b24ab676SJeff Bonwick * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24fa9e4066Sahrens * Use is subject to license terms.
25fa9e4066Sahrens */
26a6f561b4SSašo Kiselkov /*
27a6f561b4SSašo Kiselkov * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
28a6f561b4SSašo Kiselkov */
29fa9e4066Sahrens
30be6fd75aSMatthew Ahrens /*
31be6fd75aSMatthew Ahrens * Copyright (c) 2013 by Delphix. All rights reserved.
32be6fd75aSMatthew Ahrens */
33be6fd75aSMatthew Ahrens
34fa9e4066Sahrens #include <sys/zfs_context.h>
35fa9e4066Sahrens #include <sys/compress.h>
36fa9e4066Sahrens #include <sys/spa.h>
37*4454ba50SJustin T. Gibbs #include <sys/zfeature.h>
38fa9e4066Sahrens #include <sys/zio.h>
39fa9e4066Sahrens #include <sys/zio_compress.h>
40fa9e4066Sahrens
41fa9e4066Sahrens /*
42fa9e4066Sahrens * Compression vectors.
43fa9e4066Sahrens */
44fa9e4066Sahrens
45fa9e4066Sahrens zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS] = {
46c9431fa1Sahl {NULL, NULL, 0, "inherit"},
47c9431fa1Sahl {NULL, NULL, 0, "on"},
48c9431fa1Sahl {NULL, NULL, 0, "uncompressed"},
49c9431fa1Sahl {lzjb_compress, lzjb_decompress, 0, "lzjb"},
50c9431fa1Sahl {NULL, NULL, 0, "empty"},
51c9431fa1Sahl {gzip_compress, gzip_decompress, 1, "gzip-1"},
52c9431fa1Sahl {gzip_compress, gzip_decompress, 2, "gzip-2"},
53c9431fa1Sahl {gzip_compress, gzip_decompress, 3, "gzip-3"},
54c9431fa1Sahl {gzip_compress, gzip_decompress, 4, "gzip-4"},
55c9431fa1Sahl {gzip_compress, gzip_decompress, 5, "gzip-5"},
56c9431fa1Sahl {gzip_compress, gzip_decompress, 6, "gzip-6"},
57c9431fa1Sahl {gzip_compress, gzip_decompress, 7, "gzip-7"},
58c9431fa1Sahl {gzip_compress, gzip_decompress, 8, "gzip-8"},
59c9431fa1Sahl {gzip_compress, gzip_decompress, 9, "gzip-9"},
60b24ab676SJeff Bonwick {zle_compress, zle_decompress, 64, "zle"},
61a6f561b4SSašo Kiselkov {lz4_compress, lz4_decompress, 0, "lz4"},
62fa9e4066Sahrens };
63fa9e4066Sahrens
64b24ab676SJeff Bonwick enum zio_compress
zio_compress_select(spa_t * spa,enum zio_compress child,enum zio_compress parent)65*4454ba50SJustin T. Gibbs zio_compress_select(spa_t *spa, enum zio_compress child,
66*4454ba50SJustin T. Gibbs enum zio_compress parent)
67fa9e4066Sahrens {
68*4454ba50SJustin T. Gibbs enum zio_compress result;
69*4454ba50SJustin T. Gibbs
70fa9e4066Sahrens ASSERT(child < ZIO_COMPRESS_FUNCTIONS);
71fa9e4066Sahrens ASSERT(parent < ZIO_COMPRESS_FUNCTIONS);
72*4454ba50SJustin T. Gibbs ASSERT(parent != ZIO_COMPRESS_INHERIT);
73fa9e4066Sahrens
74*4454ba50SJustin T. Gibbs result = child;
75*4454ba50SJustin T. Gibbs if (result == ZIO_COMPRESS_INHERIT)
76*4454ba50SJustin T. Gibbs result = parent;
77fa9e4066Sahrens
78*4454ba50SJustin T. Gibbs if (result == ZIO_COMPRESS_ON) {
79*4454ba50SJustin T. Gibbs if (spa_feature_is_active(spa, SPA_FEATURE_LZ4_COMPRESS))
80*4454ba50SJustin T. Gibbs result = ZIO_COMPRESS_LZ4_ON_VALUE;
81*4454ba50SJustin T. Gibbs else
82*4454ba50SJustin T. Gibbs result = ZIO_COMPRESS_LEGACY_ON_VALUE;
83*4454ba50SJustin T. Gibbs }
84fa9e4066Sahrens
85*4454ba50SJustin T. Gibbs return (result);
86fa9e4066Sahrens }
87fa9e4066Sahrens
88b24ab676SJeff Bonwick size_t
zio_compress_data(enum zio_compress c,void * src,void * dst,size_t s_len)89b24ab676SJeff Bonwick zio_compress_data(enum zio_compress c, void *src, void *dst, size_t s_len)
90fa9e4066Sahrens {
91fa9e4066Sahrens uint64_t *word, *word_end;
92e54e0be9SMatthew Ahrens size_t c_len, d_len;
93b24ab676SJeff Bonwick zio_compress_info_t *ci = &zio_compress_table[c];
94fa9e4066Sahrens
95b24ab676SJeff Bonwick ASSERT((uint_t)c < ZIO_COMPRESS_FUNCTIONS);
96b24ab676SJeff Bonwick ASSERT((uint_t)c == ZIO_COMPRESS_EMPTY || ci->ci_compress != NULL);
97fa9e4066Sahrens
98fa9e4066Sahrens /*
99fa9e4066Sahrens * If the data is all zeroes, we don't even need to allocate
100b24ab676SJeff Bonwick * a block for it. We indicate this by returning zero size.
101fa9e4066Sahrens */
102b24ab676SJeff Bonwick word_end = (uint64_t *)((char *)src + s_len);
103b24ab676SJeff Bonwick for (word = src; word < word_end; word++)
104b24ab676SJeff Bonwick if (*word != 0)
105fa9e4066Sahrens break;
106fa9e4066Sahrens
107b24ab676SJeff Bonwick if (word == word_end)
108416e0cd8Sek110237 return (0);
109416e0cd8Sek110237
110b24ab676SJeff Bonwick if (c == ZIO_COMPRESS_EMPTY)
111b24ab676SJeff Bonwick return (s_len);
112b24ab676SJeff Bonwick
113fa9e4066Sahrens /* Compress at least 12.5% */
114e54e0be9SMatthew Ahrens d_len = s_len - (s_len >> 3);
115b24ab676SJeff Bonwick c_len = ci->ci_compress(src, dst, s_len, d_len, ci->ci_level);
116b24ab676SJeff Bonwick
117b24ab676SJeff Bonwick if (c_len > d_len)
118b24ab676SJeff Bonwick return (s_len);
119b24ab676SJeff Bonwick
120b24ab676SJeff Bonwick ASSERT3U(c_len, <=, d_len);
121b24ab676SJeff Bonwick return (c_len);
122fa9e4066Sahrens }
123fa9e4066Sahrens
124fa9e4066Sahrens int
zio_decompress_data(enum zio_compress c,void * src,void * dst,size_t s_len,size_t d_len)125b24ab676SJeff Bonwick zio_decompress_data(enum zio_compress c, void *src, void *dst,
126b24ab676SJeff Bonwick size_t s_len, size_t d_len)
127fa9e4066Sahrens {
128b24ab676SJeff Bonwick zio_compress_info_t *ci = &zio_compress_table[c];
129c9431fa1Sahl
130b24ab676SJeff Bonwick if ((uint_t)c >= ZIO_COMPRESS_FUNCTIONS || ci->ci_decompress == NULL)
131be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL));
132fa9e4066Sahrens
133b24ab676SJeff Bonwick return (ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level));
134fa9e4066Sahrens }
135