/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include <sys/zfs_context.h> #include <sys/compress.h> #include <sys/spa.h> #include <sys/zio.h> #include <sys/zio_compress.h> /* * Compression vectors. */ zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS] = { {NULL, NULL, 0, "inherit"}, {NULL, NULL, 0, "on"}, {NULL, NULL, 0, "uncompressed"}, {lzjb_compress, lzjb_decompress, 0, "lzjb"}, {NULL, NULL, 0, "empty"}, {gzip_compress, gzip_decompress, 1, "gzip-1"}, {gzip_compress, gzip_decompress, 2, "gzip-2"}, {gzip_compress, gzip_decompress, 3, "gzip-3"}, {gzip_compress, gzip_decompress, 4, "gzip-4"}, {gzip_compress, gzip_decompress, 5, "gzip-5"}, {gzip_compress, gzip_decompress, 6, "gzip-6"}, {gzip_compress, gzip_decompress, 7, "gzip-7"}, {gzip_compress, gzip_decompress, 8, "gzip-8"}, {gzip_compress, gzip_decompress, 9, "gzip-9"}, {zle_compress, zle_decompress, 64, "zle"}, }; enum zio_compress zio_compress_select(enum zio_compress child, enum zio_compress parent) { ASSERT(child < ZIO_COMPRESS_FUNCTIONS); ASSERT(parent < ZIO_COMPRESS_FUNCTIONS); ASSERT(parent != ZIO_COMPRESS_INHERIT && parent != ZIO_COMPRESS_ON); if (child == ZIO_COMPRESS_INHERIT) return (parent); if (child == ZIO_COMPRESS_ON) return (ZIO_COMPRESS_ON_VALUE); return (child); } size_t zio_compress_data(enum zio_compress c, void *src, void *dst, size_t s_len) { uint64_t *word, *word_end; size_t c_len, d_len, r_len; zio_compress_info_t *ci = &zio_compress_table[c]; ASSERT((uint_t)c < ZIO_COMPRESS_FUNCTIONS); ASSERT((uint_t)c == ZIO_COMPRESS_EMPTY || ci->ci_compress != NULL); /* * If the data is all zeroes, we don't even need to allocate * a block for it. We indicate this by returning zero size. */ word_end = (uint64_t *)((char *)src + s_len); for (word = src; word < word_end; word++) if (*word != 0) break; if (word == word_end) return (0); if (c == ZIO_COMPRESS_EMPTY) return (s_len); /* Compress at least 12.5% */ d_len = P2ALIGN(s_len - (s_len >> 3), (size_t)SPA_MINBLOCKSIZE); if (d_len == 0) return (s_len); c_len = ci->ci_compress(src, dst, s_len, d_len, ci->ci_level); if (c_len > d_len) return (s_len); /* * Cool. We compressed at least as much as we were hoping to. * For both security and repeatability, pad out the last sector. */ r_len = P2ROUNDUP(c_len, (size_t)SPA_MINBLOCKSIZE); if (r_len > c_len) { bzero((char *)dst + c_len, r_len - c_len); c_len = r_len; } ASSERT3U(c_len, <=, d_len); ASSERT(P2PHASE(c_len, (size_t)SPA_MINBLOCKSIZE) == 0); return (c_len); } int zio_decompress_data(enum zio_compress c, void *src, void *dst, size_t s_len, size_t d_len) { zio_compress_info_t *ci = &zio_compress_table[c]; if ((uint_t)c >= ZIO_COMPRESS_FUNCTIONS || ci->ci_decompress == NULL) return (EINVAL); return (ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level)); }