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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 http://www.opensolaris.org/os/licensing.
     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  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #ifndef	_SYS_DECOMP_H
     27 #define	_SYS_DECOMP_H
     28 
     29 #ifdef	__cplusplus
     30 extern "C" {
     31 #endif
     32 
     33 #define	CH_MAGIC_ZLIB	0x5a636d70	/* ZLIB compression */
     34 #define	CH_MAGIC_GZIP	0x8B1F		/* GZIP compression */
     35 
     36 #define	CH_VERSION	1
     37 
     38 #define	CH_ALG_ZLIB	1
     39 
     40 struct comphdr {
     41 	uint64_t	ch_magic;
     42 	uint64_t	ch_version;
     43 	uint64_t	ch_algorithm;
     44 	uint64_t	ch_fsize;
     45 	uint64_t	ch_blksize;
     46 	uint64_t	ch_blkmap[1];
     47 };
     48 
     49 #define	ZMAXBUF(n)	((n) + ((n) / 1000) + 12)
     50 
     51 #ifdef	_KERNEL
     52 
     53 struct dcnode {
     54 	struct vnode	*dc_vp;
     55 	struct vnode	*dc_subvp;
     56 	struct kmem_cache *dc_bufcache;
     57 	kmutex_t	dc_lock;
     58 	struct dcnode	*dc_hash;
     59 	struct dcnode	*dc_lrunext;
     60 	struct dcnode	*dc_lruprev;
     61 	struct comphdr	*dc_hdr;
     62 	size_t		dc_hdrsize;
     63 	size_t		dc_zmax;
     64 	int		dc_mapcnt;
     65 };
     66 
     67 #define	VTODC(vp)	((struct dcnode *)(vp)->v_data)
     68 #define	DCTOV(dp)	((dp)->dc_vp)
     69 
     70 struct vnode	*decompvp(struct vnode *, struct cred *, caller_context_t *);
     71 
     72 #endif
     73 
     74 #ifdef	__cplusplus
     75 }
     76 #endif
     77 #endif	/* _SYS_DECOMP_H */
     78