include/sys/fs/decomp.h

   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 */