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 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 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 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