167 lines
4.7 KiB
C
167 lines
4.7 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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/*
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* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
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*/
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/*
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* Copyright (c) 2013, 2018 by Delphix. All rights reserved.
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*/
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/zfeature.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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* If nonzero, every 1/X decompression attempts will fail, simulating
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* an undetected memory error.
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*/
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unsigned long zio_decompress_fail_fraction = 0;
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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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{"inherit", 0, NULL, NULL},
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{"on", 0, NULL, NULL},
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{"uncompressed", 0, NULL, NULL},
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{"lzjb", 0, lzjb_compress, lzjb_decompress},
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{"empty", 0, NULL, NULL},
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{"gzip-1", 1, gzip_compress, gzip_decompress},
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{"gzip-2", 2, gzip_compress, gzip_decompress},
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{"gzip-3", 3, gzip_compress, gzip_decompress},
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{"gzip-4", 4, gzip_compress, gzip_decompress},
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{"gzip-5", 5, gzip_compress, gzip_decompress},
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{"gzip-6", 6, gzip_compress, gzip_decompress},
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{"gzip-7", 7, gzip_compress, gzip_decompress},
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{"gzip-8", 8, gzip_compress, gzip_decompress},
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{"gzip-9", 9, gzip_compress, gzip_decompress},
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{"zle", 64, zle_compress, zle_decompress},
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{"lz4", 0, lz4_compress_zfs, lz4_decompress_zfs}
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};
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enum zio_compress
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zio_compress_select(spa_t *spa, enum zio_compress child,
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enum zio_compress parent)
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{
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enum zio_compress result;
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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);
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result = child;
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if (result == ZIO_COMPRESS_INHERIT)
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result = parent;
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if (result == ZIO_COMPRESS_ON) {
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if (spa_feature_is_active(spa, SPA_FEATURE_LZ4_COMPRESS))
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result = ZIO_COMPRESS_LZ4_ON_VALUE;
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else
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result = ZIO_COMPRESS_LEGACY_ON_VALUE;
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}
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return (result);
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}
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/*ARGSUSED*/
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static int
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zio_compress_zeroed_cb(void *data, size_t len, void *private)
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{
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uint64_t *end = (uint64_t *)((char *)data + len);
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for (uint64_t *word = (uint64_t *)data; word < end; word++)
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if (*word != 0)
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return (1);
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return (0);
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}
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size_t
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zio_compress_data(enum zio_compress c, abd_t *src, void *dst, size_t s_len)
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{
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size_t c_len, d_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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if (abd_iterate_func(src, 0, s_len, zio_compress_zeroed_cb, NULL) == 0)
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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 = s_len - (s_len >> 3);
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/* No compression algorithms can read from ABDs directly */
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void *tmp = abd_borrow_buf_copy(src, s_len);
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c_len = ci->ci_compress(tmp, dst, s_len, d_len, ci->ci_level);
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abd_return_buf(src, tmp, s_len);
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if (c_len > d_len)
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return (s_len);
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ASSERT3U(c_len, <=, d_len);
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return (c_len);
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}
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int
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zio_decompress_data_buf(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 (SET_ERROR(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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int
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zio_decompress_data(enum zio_compress c, abd_t *src, void *dst,
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size_t s_len, size_t d_len)
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{
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void *tmp = abd_borrow_buf_copy(src, s_len);
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int ret = zio_decompress_data_buf(c, tmp, dst, s_len, d_len);
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abd_return_buf(src, tmp, s_len);
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/*
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* Decompression shouldn't fail, because we've already verified
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* the checksum. However, for extra protection (e.g. against bitflips
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* in non-ECC RAM), we handle this error (and test it).
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*/
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if (zio_decompress_fail_fraction != 0 &&
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spa_get_random(zio_decompress_fail_fraction) == 0)
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ret = SET_ERROR(EINVAL);
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return (ret);
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}
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