218 lines
6.9 KiB
C
218 lines
6.9 KiB
C
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/*
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://zfsonlinux.org/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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* z_compress_level/z_uncompress are nearly identical copies of the
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* compress2/uncompress functions provided by the official zlib package
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* available at http://zlib.net/. The only changes made we to slightly
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* adapt the functions called to match the linux kernel implementation
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* of zlib. The full zlib license follows:
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*
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* zlib.h -- interface of the 'zlib' general purpose compression library
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* version 1.2.5, April 19th, 2010
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*
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* Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* Jean-loup Gailly
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* Mark Adler
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*/
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#include <sys/kmem.h>
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#include <sys/kmem_cache.h>
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#include <sys/zmod.h>
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static spl_kmem_cache_t *zlib_workspace_cache;
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/*
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* A kmem_cache is used for the zlib workspaces to avoid having to vmalloc
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* and vfree for every call. Using a kmem_cache also has the advantage
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* that improves the odds that the memory used will be local to this cpu.
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* To further improve things it might be wise to create a dedicated per-cpu
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* workspace for use. This would take some additional care because we then
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* must disable preemption around the critical section, and verify that
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* zlib_deflate* and zlib_inflate* never internally call schedule().
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*/
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static void *
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zlib_workspace_alloc(int flags)
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{
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return (kmem_cache_alloc(zlib_workspace_cache, flags & ~(__GFP_FS)));
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}
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static void
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zlib_workspace_free(void *workspace)
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{
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kmem_cache_free(zlib_workspace_cache, workspace);
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}
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/*
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* Compresses the source buffer into the destination buffer. The level
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* parameter has the same meaning as in deflateInit. sourceLen is the byte
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* length of the source buffer. Upon entry, destLen is the total size of the
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* destination buffer, which must be at least 0.1% larger than sourceLen plus
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* 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
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*
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* compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
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* memory, Z_BUF_ERROR if there was not enough room in the output buffer,
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* Z_STREAM_ERROR if the level parameter is invalid.
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*/
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int
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z_compress_level(void *dest, size_t *destLen, const void *source,
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size_t sourceLen, int level)
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{
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z_stream stream;
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int err;
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stream.next_in = (Byte *)source;
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stream.avail_in = (uInt)sourceLen;
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stream.next_out = dest;
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stream.avail_out = (uInt)*destLen;
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if ((size_t)stream.avail_out != *destLen)
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return (Z_BUF_ERROR);
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stream.workspace = zlib_workspace_alloc(KM_SLEEP);
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if (!stream.workspace)
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return (Z_MEM_ERROR);
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err = zlib_deflateInit(&stream, level);
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if (err != Z_OK) {
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zlib_workspace_free(stream.workspace);
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return (err);
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}
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err = zlib_deflate(&stream, Z_FINISH);
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if (err != Z_STREAM_END) {
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zlib_deflateEnd(&stream);
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zlib_workspace_free(stream.workspace);
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return (err == Z_OK ? Z_BUF_ERROR : err);
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}
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*destLen = stream.total_out;
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err = zlib_deflateEnd(&stream);
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zlib_workspace_free(stream.workspace);
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return (err);
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}
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EXPORT_SYMBOL(z_compress_level);
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/*
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* Decompresses the source buffer into the destination buffer. sourceLen is
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* the byte length of the source buffer. Upon entry, destLen is the total
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* size of the destination buffer, which must be large enough to hold the
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* entire uncompressed data. (The size of the uncompressed data must have
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* been saved previously by the compressor and transmitted to the decompressor
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* by some mechanism outside the scope of this compression library.)
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* Upon exit, destLen is the actual size of the compressed buffer.
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* This function can be used to decompress a whole file at once if the
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* input file is mmap'ed.
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*
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* uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
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* enough memory, Z_BUF_ERROR if there was not enough room in the output
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* buffer, or Z_DATA_ERROR if the input data was corrupted.
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*/
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int
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z_uncompress(void *dest, size_t *destLen, const void *source, size_t sourceLen)
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{
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z_stream stream;
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int err;
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stream.next_in = (Byte *)source;
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stream.avail_in = (uInt)sourceLen;
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stream.next_out = dest;
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stream.avail_out = (uInt)*destLen;
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if ((size_t)stream.avail_out != *destLen)
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return (Z_BUF_ERROR);
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stream.workspace = zlib_workspace_alloc(KM_SLEEP);
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if (!stream.workspace)
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return (Z_MEM_ERROR);
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err = zlib_inflateInit(&stream);
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if (err != Z_OK) {
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zlib_workspace_free(stream.workspace);
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return (err);
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}
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err = zlib_inflate(&stream, Z_FINISH);
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if (err != Z_STREAM_END) {
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zlib_inflateEnd(&stream);
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zlib_workspace_free(stream.workspace);
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if (err == Z_NEED_DICT ||
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(err == Z_BUF_ERROR && stream.avail_in == 0))
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return (Z_DATA_ERROR);
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return (err);
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}
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*destLen = stream.total_out;
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err = zlib_inflateEnd(&stream);
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zlib_workspace_free(stream.workspace);
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return (err);
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}
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EXPORT_SYMBOL(z_uncompress);
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int
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spl_zlib_init(void)
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{
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int size;
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size = MAX(spl_zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
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zlib_inflate_workspacesize());
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zlib_workspace_cache = kmem_cache_create(
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"spl_zlib_workspace_cache",
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size, 0, NULL, NULL, NULL, NULL, NULL,
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KMC_VMEM);
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if (!zlib_workspace_cache)
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return (1);
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return (0);
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}
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void
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spl_zlib_fini(void)
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{
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kmem_cache_destroy(zlib_workspace_cache);
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zlib_workspace_cache = NULL;
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}
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