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.
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.
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]
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
27 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
30 #include <sys/zfs_context.h>
31 #include <sys/compress.h>
34 #include <sys/zio_compress.h>
37 * Compression vectors.
40 zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS] = {
41 {NULL, NULL, 0, "inherit"},
42 {NULL, NULL, 0, "on"},
43 {NULL, NULL, 0, "uncompressed"},
44 {lzjb_compress, lzjb_decompress, 0, "lzjb"},
45 {NULL, NULL, 0, "empty"},
46 {gzip_compress, gzip_decompress, 1, "gzip-1"},
47 {gzip_compress, gzip_decompress, 2, "gzip-2"},
48 {gzip_compress, gzip_decompress, 3, "gzip-3"},
49 {gzip_compress, gzip_decompress, 4, "gzip-4"},
50 {gzip_compress, gzip_decompress, 5, "gzip-5"},
51 {gzip_compress, gzip_decompress, 6, "gzip-6"},
52 {gzip_compress, gzip_decompress, 7, "gzip-7"},
53 {gzip_compress, gzip_decompress, 8, "gzip-8"},
54 {gzip_compress, gzip_decompress, 9, "gzip-9"},
55 {zle_compress, zle_decompress, 64, "zle"},
56 {lz4_compress, lz4_decompress, 0, "lz4"},
60 zio_compress_select(enum zio_compress child, enum zio_compress parent)
62 ASSERT(child < ZIO_COMPRESS_FUNCTIONS);
63 ASSERT(parent < ZIO_COMPRESS_FUNCTIONS);
64 ASSERT(parent != ZIO_COMPRESS_INHERIT && parent != ZIO_COMPRESS_ON);
66 if (child == ZIO_COMPRESS_INHERIT)
69 if (child == ZIO_COMPRESS_ON)
70 return (ZIO_COMPRESS_ON_VALUE);
76 zio_compress_data(enum zio_compress c, void *src, void *dst, size_t s_len)
78 uint64_t *word, *word_end;
79 size_t c_len, d_len, r_len;
80 zio_compress_info_t *ci = &zio_compress_table[c];
82 ASSERT((uint_t)c < ZIO_COMPRESS_FUNCTIONS);
83 ASSERT((uint_t)c == ZIO_COMPRESS_EMPTY || ci->ci_compress != NULL);
86 * If the data is all zeroes, we don't even need to allocate
87 * a block for it. We indicate this by returning zero size.
89 word_end = (uint64_t *)((char *)src + s_len);
90 for (word = src; word < word_end; word++)
97 if (c == ZIO_COMPRESS_EMPTY)
100 /* Compress at least 12.5% */
101 d_len = P2ALIGN(s_len - (s_len >> 3), (size_t)SPA_MINBLOCKSIZE);
105 c_len = ci->ci_compress(src, dst, s_len, d_len, ci->ci_level);
111 * Cool. We compressed at least as much as we were hoping to.
112 * For both security and repeatability, pad out the last sector.
114 r_len = P2ROUNDUP(c_len, (size_t)SPA_MINBLOCKSIZE);
116 bzero((char *)dst + c_len, r_len - c_len);
120 ASSERT3U(c_len, <=, d_len);
121 ASSERT(P2PHASE(c_len, (size_t)SPA_MINBLOCKSIZE) == 0);
127 zio_decompress_data(enum zio_compress c, void *src, void *dst,
128 size_t s_len, size_t d_len)
130 zio_compress_info_t *ci = &zio_compress_table[c];
132 if ((uint_t)c >= ZIO_COMPRESS_FUNCTIONS || ci->ci_decompress == NULL)
135 return (ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level));