zio_compress.c revision be6fd75a69ae679453d9cda5bff3326111e6d1ca
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
*/
/*
* Copyright (c) 2013 by Delphix. All rights reserved.
*/
#include <sys/zfs_context.h>
#include <sys/compress.h>
#include <sys/zio_compress.h>
/*
* Compression vectors.
*/
};
enum zio_compress
{
if (child == ZIO_COMPRESS_INHERIT)
return (parent);
if (child == ZIO_COMPRESS_ON)
return (ZIO_COMPRESS_ON_VALUE);
return (child);
}
{
/*
* If the data is all zeroes, we don't even need to allocate
* a block for it. We indicate this by returning zero size.
*/
if (*word != 0)
break;
return (0);
if (c == ZIO_COMPRESS_EMPTY)
return (s_len);
/* Compress at least 12.5% */
if (d_len == 0)
return (s_len);
return (s_len);
/*
* Cool. We compressed at least as much as we were hoping to.
* For both security and repeatability, pad out the last sector.
*/
}
return (c_len);
}
int
{
}