gzip.c

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    1 /*
    2  * CDDL HEADER START
    3  *
    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.
    7  *
    8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
    9  * or https://opensource.org/licenses/CDDL-1.0.
   10  * See the License for the specific language governing permissions
   11  * and limitations under the License.
   12  *
   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]
   18  *
   19  * CDDL HEADER END
   20  */
   21 
   22 /*
   23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   24  * Use is subject to license terms.
   25  */
   26 
   27 
   28 
   29 #include <sys/debug.h>
   30 #include <sys/types.h>
   31 #include <sys/qat.h>
   32 #include <sys/zio_compress.h>
   33 
   34 #ifdef _KERNEL
   35 
   36 #include <sys/zmod.h>
   37 typedef size_t zlen_t;
   38 #define compress_func   z_compress_level
   39 #define uncompress_func z_uncompress
   40 
   41 #else /* _KERNEL */
   42 
   43 #include <zlib.h>
   44 typedef uLongf zlen_t;
   45 #define compress_func   compress2
   46 #define uncompress_func uncompress
   47 
   48 #endif
   49 
   50 size_t
   51 gzip_compress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n)
   52 {
   53         int ret;
   54         zlen_t dstlen = d_len;
   55 
   56         ASSERT(d_len <= s_len);
   57 
   58         /* check if hardware accelerator can be used */
   59         if (qat_dc_use_accel(s_len)) {
   60                 ret = qat_compress(QAT_COMPRESS, s_start, s_len, d_start,
   61                     d_len, &dstlen);
   62                 if (ret == CPA_STATUS_SUCCESS) {
   63                         return ((size_t)dstlen);
   64                 } else if (ret == CPA_STATUS_INCOMPRESSIBLE) {
   65                         if (d_len != s_len)
   66                                 return (s_len);
   67 
   68                         memcpy(d_start, s_start, s_len);
   69                         return (s_len);
   70                 }
   71                 /* if hardware compression fails, do it again with software */
   72         }
   73 
   74         if (compress_func(d_start, &dstlen, s_start, s_len, n) != Z_OK) {
   75                 if (d_len != s_len)
   76                         return (s_len);
   77 
   78                 memcpy(d_start, s_start, s_len);
   79                 return (s_len);
   80         }
   81 
   82         return ((size_t)dstlen);
   83 }
   84 
   85 int
   86 gzip_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n)
   87 {
   88         (void) n;
   89         zlen_t dstlen = d_len;
   90 
   91         ASSERT(d_len >= s_len);
   92 
   93         /* check if hardware accelerator can be used */
   94         if (qat_dc_use_accel(d_len)) {
   95                 if (qat_compress(QAT_DECOMPRESS, s_start, s_len,
   96                     d_start, d_len, &dstlen) == CPA_STATUS_SUCCESS)
   97                         return (0);
   98                 /* if hardware de-compress fail, do it again with software */
   99         }
  100 
  101         if (uncompress_func(d_start, &dstlen, s_start, s_len) != Z_OK)
  102                 return (-1);
  103 
  104         return (0);
  105 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/module/zfs/gzip.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/zfs/gzip.c