4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
27 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
31 * Copyright (c) 2013 by Delphix. All rights reserved.
34 #include <sys/zfs_context.h>
35 #include <sys/compress.h>
37 #include <sys/zfeature.h>
39 #include <sys/zio_compress.h>
42 * Compression vectors.
45 zio_compress_info_t zio_compress_table
[ZIO_COMPRESS_FUNCTIONS
] = {
46 {NULL
, NULL
, 0, "inherit"},
47 {NULL
, NULL
, 0, "on"},
48 {NULL
, NULL
, 0, "uncompressed"},
49 {lzjb_compress
, lzjb_decompress
, 0, "lzjb"},
50 {NULL
, NULL
, 0, "empty"},
51 {gzip_compress
, gzip_decompress
, 1, "gzip-1"},
52 {gzip_compress
, gzip_decompress
, 2, "gzip-2"},
53 {gzip_compress
, gzip_decompress
, 3, "gzip-3"},
54 {gzip_compress
, gzip_decompress
, 4, "gzip-4"},
55 {gzip_compress
, gzip_decompress
, 5, "gzip-5"},
56 {gzip_compress
, gzip_decompress
, 6, "gzip-6"},
57 {gzip_compress
, gzip_decompress
, 7, "gzip-7"},
58 {gzip_compress
, gzip_decompress
, 8, "gzip-8"},
59 {gzip_compress
, gzip_decompress
, 9, "gzip-9"},
60 {zle_compress
, zle_decompress
, 64, "zle"},
61 {lz4_compress_zfs
, lz4_decompress_zfs
, 0, "lz4"},
65 zio_compress_select(spa_t
*spa
, enum zio_compress child
,
66 enum zio_compress parent
)
68 enum zio_compress result
;
70 ASSERT(child
< ZIO_COMPRESS_FUNCTIONS
);
71 ASSERT(parent
< ZIO_COMPRESS_FUNCTIONS
);
72 ASSERT(parent
!= ZIO_COMPRESS_INHERIT
);
75 if (result
== ZIO_COMPRESS_INHERIT
)
78 if (result
== ZIO_COMPRESS_ON
) {
79 if (spa_feature_is_active(spa
, SPA_FEATURE_LZ4_COMPRESS
))
80 result
= ZIO_COMPRESS_LZ4_ON_VALUE
;
82 result
= ZIO_COMPRESS_LEGACY_ON_VALUE
;
89 zio_compress_data(enum zio_compress c
, void *src
, void *dst
, size_t s_len
)
91 uint64_t *word
, *word_end
;
93 zio_compress_info_t
*ci
= &zio_compress_table
[c
];
95 ASSERT((uint_t
)c
< ZIO_COMPRESS_FUNCTIONS
);
96 ASSERT((uint_t
)c
== ZIO_COMPRESS_EMPTY
|| ci
->ci_compress
!= NULL
);
99 * If the data is all zeroes, we don't even need to allocate
100 * a block for it. We indicate this by returning zero size.
102 word_end
= (uint64_t *)((char *)src
+ s_len
);
103 for (word
= src
; word
< word_end
; word
++)
107 if (word
== word_end
)
110 if (c
== ZIO_COMPRESS_EMPTY
)
113 /* Compress at least 12.5% */
114 d_len
= s_len
- (s_len
>> 3);
115 c_len
= ci
->ci_compress(src
, dst
, s_len
, d_len
, ci
->ci_level
);
120 ASSERT3U(c_len
, <=, d_len
);
125 zio_decompress_data(enum zio_compress c
, void *src
, void *dst
,
126 size_t s_len
, size_t d_len
)
128 zio_compress_info_t
*ci
= &zio_compress_table
[c
];
130 if ((uint_t
)c
>= ZIO_COMPRESS_FUNCTIONS
|| ci
->ci_decompress
== NULL
)
131 return (SET_ERROR(EINVAL
));
133 return (ci
->ci_decompress(src
, dst
, s_len
, d_len
, ci
->ci_level
));