2 * BSD 3-Clause New License (https://spdx.org/licenses/BSD-3-Clause.html)
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
7 * 1. Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
14 * 3. Neither the name of the copyright holder nor the names of its
15 * contributors may be used to endorse or promote products derived from this
16 * software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
32 * Copyright (c) 2016-2018, Klara Inc.
33 * Copyright (c) 2016-2018, Allan Jude
34 * Copyright (c) 2018-2020, Sebastian Gottschall
35 * Copyright (c) 2019-2020, Michael Niewöhner
36 * Copyright (c) 2020, The FreeBSD Foundation [1]
38 * [1] Portions of this software were developed by Allan Jude
39 * under sponsorship from the FreeBSD Foundation.
51 * NOTE: all fields in this header are in big endian order.
53 typedef struct zfs_zstd_header {
54 /* Compressed size of data */
58 * Version and compression level
59 * We use a union to be able to big endian encode a single 32 bit
60 * unsigned integer, but still access the individual bitmasked
64 uint32_t raw_version_level;
66 uint32_t version : 24;
77 #define ZSTDSTAT(stat) (zstd_stats.stat.value.ui64)
78 #define ZSTDSTAT_INCR(stat, val) \
79 atomic_add_64(&zstd_stats.stat.value.ui64, (val))
80 #define ZSTDSTAT_BUMP(stat) ZSTDSTAT_INCR(stat, 1)
82 /* (de)init for user space / kernel emulation */
86 size_t zfs_zstd_compress(void *s_start, void *d_start, size_t s_len,
87 size_t d_len, int level);
88 int zfs_zstd_get_level(void *s_start, size_t s_len, uint8_t *level);
89 int zfs_zstd_decompress_level(void *s_start, void *d_start, size_t s_len,
90 size_t d_len, uint8_t *level);
91 int zfs_zstd_decompress(void *s_start, void *d_start, size_t s_len,
93 void zfs_zstd_cache_reap_now(void);
99 #endif /* _ZFS_ZSTD_H */