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