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While portions of the code needed to support z_compress_level() and z_uncompress() where in place. In reality the current implementation was non-functional, it just was compilable. The critical missing component was to setup a workspace for the compress/uncompress stream structures to use. A kmem_cache was added for the workspace area because we require a large chunk of memory. This avoids to need to continually alloc/free this memory and vmap() the pages which is very slow. Several objects will reside in the per-cpu kmem_cache making them quick to acquire and release. A further optimization would be to adjust the implementation to additional ensure the memory is local to the cpu. Currently that may not be the case.
70 lines
3.0 KiB
C
70 lines
3.0 KiB
C
/*****************************************************************************\
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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://github.com/behlendorf/spl/>.
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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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* 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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#ifndef _SPL_ZMOD_H
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#define _SPL_ZMOD_H
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#include <sys/types.h>
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#include <linux/zlib.h>
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extern int z_compress_level(void *dest, size_t *destLen, const void *source,
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size_t sourceLen, int level);
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extern int z_uncompress(void *dest, size_t *destLen, const void *source,
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size_t sourceLen);
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int zlib_init(void);
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void zlib_fini(void);
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#endif /* SPL_ZMOD_H */
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