#ifndef _SPL_ZMOD_H
#define _SPL_ZMOD_H
+#include <sys/types.h>
#include <linux/zlib.h>
-/*
- * Compresses the source buffer into the destination buffer. The level
- * parameter has the same meaning as in deflateInit. sourceLen is the byte
- * length of the source buffer. Upon entry, destLen is the total size of the
- * destination buffer, which must be at least 0.1% larger than sourceLen plus
- * 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
- *
- * compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
- * memory, Z_BUF_ERROR if there was not enough room in the output buffer,
- * Z_STREAM_ERROR if the level parameter is invalid.
- */
-static __inline__ int
-z_compress_level(void *dest, size_t *destLen, const void *source,
- size_t sourceLen, int level)
-{
- z_stream stream;
- int err;
-
- stream.next_in = (Byte *)source;
- stream.avail_in = (uInt)sourceLen;
-#ifdef MAXSEG_64K
- /* Check for source > 64K on 16-bit machine: */
- if ((size_t)stream.avail_in != sourceLen)
- return Z_BUF_ERROR;
-#endif
- stream.next_out = dest;
- stream.avail_out = (uInt)*destLen;
-
- if ((size_t)stream.avail_out != *destLen)
- return Z_BUF_ERROR;
-
- err = zlib_deflateInit(&stream, level);
- if (err != Z_OK)
- return err;
-
- err = zlib_deflate(&stream, Z_FINISH);
- if (err != Z_STREAM_END) {
- zlib_deflateEnd(&stream);
- return err == Z_OK ? Z_BUF_ERROR : err;
- }
- *destLen = stream.total_out;
-
- err = zlib_deflateEnd(&stream);
- return err;
-} /* z_compress_level() */
-
-/*
- * Decompresses the source buffer into the destination buffer. sourceLen is
- * the byte length of the source buffer. Upon entry, destLen is the total
- * size of the destination buffer, which must be large enough to hold the
- * entire uncompressed data. (The size of the uncompressed data must have
- * been saved previously by the compressor and transmitted to the decompressor
- * by some mechanism outside the scope of this compression library.)
- * Upon exit, destLen is the actual size of the compressed buffer.
- * This function can be used to decompress a whole file at once if the
- * input file is mmap'ed.
- *
- * uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
- * enough memory, Z_BUF_ERROR if there was not enough room in the output
- * buffer, or Z_DATA_ERROR if the input data was corrupted.
- */
-static __inline__ int
-z_uncompress(void *dest, size_t *destLen, const void *source, size_t sourceLen)
-{
- z_stream stream;
- int err;
-
- stream.next_in = (Byte *)source;
- stream.avail_in = (uInt)sourceLen;
- /* Check for source > 64K on 16-bit machine: */
- if ((size_t)stream.avail_in != sourceLen)
- return Z_BUF_ERROR;
-
- stream.next_out = dest;
- stream.avail_out = (uInt)*destLen;
-
- if ((size_t)stream.avail_out != *destLen)
- return Z_BUF_ERROR;
-
- err = zlib_inflateInit(&stream);
- if (err != Z_OK)
- return err;
-
- err = zlib_inflate(&stream, Z_FINISH);
- if (err != Z_STREAM_END) {
- zlib_inflateEnd(&stream);
-
- if (err == Z_NEED_DICT ||
- (err == Z_BUF_ERROR && stream.avail_in == 0))
- return Z_DATA_ERROR;
-
- return err;
- }
- *destLen = stream.total_out;
+extern int z_compress_level(void *dest, size_t *destLen, const void *source,
+ size_t sourceLen, int level);
+extern int z_uncompress(void *dest, size_t *destLen, const void *source,
+ size_t sourceLen);
- err = zlib_inflateEnd(&stream);
- return err;
-} /* z_uncompress() */
+int zlib_init(void);
+void zlib_fini(void);
#endif /* SPL_ZMOD_H */
--- /dev/null
+/*****************************************************************************\
+ * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ * Copyright (C) 2007 The Regents of the University of California.
+ * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
+ * UCRL-CODE-235197
+ *
+ * This file is part of the SPL, Solaris Porting Layer.
+ * For details, see <http://github.com/behlendorf/spl/>.
+ *
+ * The SPL is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * The SPL is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with the SPL. If not, see <http://www.gnu.org/licenses/>.
+ *****************************************************************************
+ * z_compress_level/z_uncompress are nearly identical copies of the
+ * compress2/uncompress functions provided by the official zlib package
+ * available at http://zlib.net/. The only changes made we to slightly
+ * adapt the functions called to match the linux kernel implementation
+ * of zlib. The full zlib license follows:
+ *
+ * zlib.h -- interface of the 'zlib' general purpose compression library
+ * version 1.2.5, April 19th, 2010
+ *
+ * Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ * Jean-loup Gailly
+ * Mark Adler
+\*****************************************************************************/
+
+
+#include <sys/kmem.h>
+#include <sys/zmod.h>
+#include <spl-debug.h>
+
+#ifdef DEBUG_SUBSYSTEM
+#undef DEBUG_SUBSYSTEM
+#endif
+
+#define DEBUG_SUBSYSTEM SS_ZLIB
+
+static spl_kmem_cache_t *zlib_workspace_cache;
+
+/*
+ * A kmem_cache is used for the zlib workspaces to avoid having to vmalloc
+ * and vfree for every call. Using a kmem_cache also has the advantage
+ * that improves the odds that the memory used will be local to this cpu.
+ * To further improve things it might be wise to create a dedicated per-cpu
+ * workspace for use. This would take some additional care because we then
+ * must disable preemption around the critical section, and verify that
+ * zlib_deflate* and zlib_inflate* never internally call schedule().
+ */
+static void *
+zlib_workspace_alloc(int flags)
+{
+ return kmem_cache_alloc(zlib_workspace_cache, flags & ~(__GFP_FS));
+}
+
+static void
+zlib_workspace_free(void *workspace)
+{
+ kmem_cache_free(zlib_workspace_cache, workspace);
+}
+
+/*
+ * Compresses the source buffer into the destination buffer. The level
+ * parameter has the same meaning as in deflateInit. sourceLen is the byte
+ * length of the source buffer. Upon entry, destLen is the total size of the
+ * destination buffer, which must be at least 0.1% larger than sourceLen plus
+ * 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
+ *
+ * compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
+ * memory, Z_BUF_ERROR if there was not enough room in the output buffer,
+ * Z_STREAM_ERROR if the level parameter is invalid.
+ */
+int
+z_compress_level(void *dest, size_t *destLen, const void *source,
+ size_t sourceLen, int level)
+{
+ z_stream stream;
+ int err;
+
+ stream.next_in = (Byte *)source;
+ stream.avail_in = (uInt)sourceLen;
+ stream.next_out = dest;
+ stream.avail_out = (uInt)*destLen;
+
+ if ((size_t)stream.avail_out != *destLen)
+ return Z_BUF_ERROR;
+
+ stream.workspace = zlib_workspace_alloc(KM_SLEEP);
+ if (!stream.workspace)
+ return Z_MEM_ERROR;
+
+ err = zlib_deflateInit(&stream, level);
+ if (err != Z_OK) {
+ zlib_workspace_free(stream.workspace);
+ return err;
+ }
+
+ err = zlib_deflate(&stream, Z_FINISH);
+ if (err != Z_STREAM_END) {
+ zlib_deflateEnd(&stream);
+ zlib_workspace_free(stream.workspace);
+ return err == Z_OK ? Z_BUF_ERROR : err;
+ }
+ *destLen = stream.total_out;
+
+ err = zlib_deflateEnd(&stream);
+ zlib_workspace_free(stream.workspace);
+
+ return err;
+}
+EXPORT_SYMBOL(z_compress_level);
+
+/*
+ * Decompresses the source buffer into the destination buffer. sourceLen is
+ * the byte length of the source buffer. Upon entry, destLen is the total
+ * size of the destination buffer, which must be large enough to hold the
+ * entire uncompressed data. (The size of the uncompressed data must have
+ * been saved previously by the compressor and transmitted to the decompressor
+ * by some mechanism outside the scope of this compression library.)
+ * Upon exit, destLen is the actual size of the compressed buffer.
+ * This function can be used to decompress a whole file at once if the
+ * input file is mmap'ed.
+ *
+ * uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
+ * enough memory, Z_BUF_ERROR if there was not enough room in the output
+ * buffer, or Z_DATA_ERROR if the input data was corrupted.
+ */
+int
+z_uncompress(void *dest, size_t *destLen, const void *source, size_t sourceLen)
+{
+ z_stream stream;
+ int err;
+
+ stream.next_in = (Byte *)source;
+ stream.avail_in = (uInt)sourceLen;
+ stream.next_out = dest;
+ stream.avail_out = (uInt)*destLen;
+
+ if ((size_t)stream.avail_out != *destLen)
+ return Z_BUF_ERROR;
+
+ stream.workspace = zlib_workspace_alloc(KM_SLEEP);
+ if (!stream.workspace)
+ return Z_MEM_ERROR;
+
+ err = zlib_inflateInit(&stream);
+ if (err != Z_OK) {
+ zlib_workspace_free(stream.workspace);
+ return err;
+ }
+
+ err = zlib_inflate(&stream, Z_FINISH);
+ if (err != Z_STREAM_END) {
+ zlib_inflateEnd(&stream);
+ zlib_workspace_free(stream.workspace);
+
+ if (err == Z_NEED_DICT ||
+ (err == Z_BUF_ERROR && stream.avail_in == 0))
+ return Z_DATA_ERROR;
+
+ return err;
+ }
+ *destLen = stream.total_out;
+
+ err = zlib_inflateEnd(&stream);
+ zlib_workspace_free(stream.workspace);
+
+ return err;
+}
+EXPORT_SYMBOL(z_uncompress);
+
+int zlib_init(void)
+{
+ SENTRY;
+ zlib_workspace_cache = kmem_cache_create("spl_zlib_workspace_cache",
+ max(zlib_deflate_workspacesize(), zlib_inflate_workspacesize()),
+ 0, NULL, NULL, NULL, NULL, NULL, KMC_VMEM);
+ if (!zlib_workspace_cache)
+ SRETURN(1);
+
+ SRETURN(0);
+}
+
+void zlib_fini(void)
+{
+ SENTRY;
+ kmem_cache_destroy(zlib_workspace_cache);
+ zlib_workspace_cache = NULL;
+ SEXIT;
+}
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