| /* |
| * 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. |
| */ |
| /* |
| * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. |
| */ |
| |
| /* |
| * Copyright (c) 2013, 2018 by Delphix. All rights reserved. |
| */ |
| |
| #include <sys/zfs_context.h> |
| #include <sys/spa.h> |
| #include <sys/zfeature.h> |
| #include <sys/zio.h> |
| #include <sys/zio_compress.h> |
| |
| /* |
| * If nonzero, every 1/X decompression attempts will fail, simulating |
| * an undetected memory error. |
| */ |
| unsigned long zio_decompress_fail_fraction = 0; |
| |
| /* |
| * Compression vectors. |
| */ |
| zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS] = { |
| {"inherit", 0, NULL, NULL}, |
| {"on", 0, NULL, NULL}, |
| {"uncompressed", 0, NULL, NULL}, |
| {"lzjb", 0, lzjb_compress, lzjb_decompress}, |
| {"empty", 0, NULL, NULL}, |
| {"gzip-1", 1, gzip_compress, gzip_decompress}, |
| {"gzip-2", 2, gzip_compress, gzip_decompress}, |
| {"gzip-3", 3, gzip_compress, gzip_decompress}, |
| {"gzip-4", 4, gzip_compress, gzip_decompress}, |
| {"gzip-5", 5, gzip_compress, gzip_decompress}, |
| {"gzip-6", 6, gzip_compress, gzip_decompress}, |
| {"gzip-7", 7, gzip_compress, gzip_decompress}, |
| {"gzip-8", 8, gzip_compress, gzip_decompress}, |
| {"gzip-9", 9, gzip_compress, gzip_decompress}, |
| {"zle", 64, zle_compress, zle_decompress}, |
| {"lz4", 0, lz4_compress_zfs, lz4_decompress_zfs} |
| }; |
| |
| enum zio_compress |
| zio_compress_select(spa_t *spa, enum zio_compress child, |
| enum zio_compress parent) |
| { |
| enum zio_compress result; |
| |
| ASSERT(child < ZIO_COMPRESS_FUNCTIONS); |
| ASSERT(parent < ZIO_COMPRESS_FUNCTIONS); |
| ASSERT(parent != ZIO_COMPRESS_INHERIT); |
| |
| result = child; |
| if (result == ZIO_COMPRESS_INHERIT) |
| result = parent; |
| |
| if (result == ZIO_COMPRESS_ON) { |
| if (spa_feature_is_active(spa, SPA_FEATURE_LZ4_COMPRESS)) |
| result = ZIO_COMPRESS_LZ4_ON_VALUE; |
| else |
| result = ZIO_COMPRESS_LEGACY_ON_VALUE; |
| } |
| |
| return (result); |
| } |
| |
| /*ARGSUSED*/ |
| static int |
| zio_compress_zeroed_cb(void *data, size_t len, void *private) |
| { |
| uint64_t *end = (uint64_t *)((char *)data + len); |
| for (uint64_t *word = (uint64_t *)data; word < end; word++) |
| if (*word != 0) |
| return (1); |
| |
| return (0); |
| } |
| |
| size_t |
| zio_compress_data(enum zio_compress c, abd_t *src, void *dst, size_t s_len) |
| { |
| size_t c_len, d_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. |
| */ |
| if (abd_iterate_func(src, 0, s_len, zio_compress_zeroed_cb, NULL) == 0) |
| return (0); |
| |
| if (c == ZIO_COMPRESS_EMPTY) |
| return (s_len); |
| |
| /* Compress at least 12.5% */ |
| d_len = s_len - (s_len >> 3); |
| |
| /* No compression algorithms can read from ABDs directly */ |
| void *tmp = abd_borrow_buf_copy(src, s_len); |
| c_len = ci->ci_compress(tmp, dst, s_len, d_len, ci->ci_level); |
| abd_return_buf(src, tmp, s_len); |
| |
| if (c_len > d_len) |
| return (s_len); |
| |
| ASSERT3U(c_len, <=, d_len); |
| return (c_len); |
| } |
| |
| int |
| zio_decompress_data_buf(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 (SET_ERROR(EINVAL)); |
| |
| return (ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level)); |
| } |
| |
| int |
| zio_decompress_data(enum zio_compress c, abd_t *src, void *dst, |
| size_t s_len, size_t d_len) |
| { |
| void *tmp = abd_borrow_buf_copy(src, s_len); |
| int ret = zio_decompress_data_buf(c, tmp, dst, s_len, d_len); |
| abd_return_buf(src, tmp, s_len); |
| |
| /* |
| * Decompression shouldn't fail, because we've already verified |
| * the checksum. However, for extra protection (e.g. against bitflips |
| * in non-ECC RAM), we handle this error (and test it). |
| */ |
| if (zio_decompress_fail_fraction != 0 && |
| spa_get_random(zio_decompress_fail_fraction) == 0) |
| ret = SET_ERROR(EINVAL); |
| |
| return (ret); |
| } |