FreeBSD/Linux Kernel Cross Reference
sys/bsd/hfs/hfs_hotfiles.h

     /*
      * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    #ifndef __HFS_HOTFILES__
    #define __HFS_HOTFILES__
    
    #include <sys/appleapiopts.h>
    
    #ifdef KERNEL
    #ifdef __APPLE_API_PRIVATE
    
    
    #define HFC_FILENAME    ".hotfiles.btree"
    
    
    /*
     * Temperature measurement constraints.
     */
    #define HFC_DEFAULT_FILE_COUNT   1000
    #define HFC_DEFAULT_DURATION     (3600 * 60)
    #define HFC_CUMULATIVE_CYCLES    4
    #define HFC_MAXIMUM_FILE_COUNT   5000
    #define HFC_MAXIMUM_FILESIZE     (10 * 1024 * 1024)
    #define HFC_MINIMUM_TEMPERATURE  16
    
    
    /*
     * Sync constraints.
     */
    #define HFC_BLKSPERSYNC    300
    #define HFC_FILESPERSYNC   50
    
    
    /*
     * Hot file clustering stages.
     */
    enum hfc_stage {
            HFC_DISABLED,
            HFC_IDLE,
            HFC_BUSY,
            HFC_RECORDING,
            HFC_EVALUATION,
            HFC_EVICTION,
            HFC_ADOPTION,
    };
    
    
    /* 
     * B-tree file key format (on-disk).
     */
    struct HotFileKey {
            u_int16_t       keyLength;      /* length of key, excluding this field */
            u_int8_t        forkType;       /* 0 = data fork, FF = resource fork */
            u_int8_t        pad;            /* make the other fields align on 32-bit boundary */
            u_int32_t       temperature;    /* temperature recorded */
            u_int32_t       fileID;         /* file ID */
    };
    typedef struct HotFileKey HotFileKey;
    
    #define HFC_LOOKUPTAG   0xFFFFFFFF
    #define HFC_KEYLENGTH   (sizeof(HotFileKey) - sizeof(u_int16_t))
    
    /* 
     * B-tree header node user info (on-disk).
     */
    struct HotFilesInfo {
            u_int32_t       magic;
            u_int32_t       version;
            u_int32_t       duration;    /* duration of sample period */
            u_int32_t       timebase;   /* recording period start time */
            u_int32_t       timeleft;    /* recording period stop time */
            u_int32_t       threshold;
            u_int32_t       maxfileblks;
            u_int32_t       maxfilecnt;
            u_int8_t        tag[32];
    };
    typedef struct HotFilesInfo HotFilesInfo;
    
   #define HFC_MAGIC       0xFF28FF26
   #define HFC_VERSION     1
   
   
   struct hfsmount;
   struct proc;
   struct vnode;
   
   /*
    * Hot File interface functions.
    */
   int  hfs_hotfilesync (struct hfsmount *, struct proc *);
   
   int  hfs_recording_init(struct hfsmount *, struct proc *);
   int  hfs_recording_start (struct hfsmount *, struct proc *);
   int  hfs_recording_stop (struct hfsmount *, struct proc *);
   int  hfs_recording_suspend (struct hfsmount *, struct proc *);
   int  hfs_recording_abort (struct hfsmount *, struct proc *);
   
   int  hfs_addhotfile (struct vnode *);
   int  hfs_removehotfile (struct vnode *);
   
   #endif /* __APPLE_API_PRIVATE */
   #endif /* KERNEL */
   #endif /* __HFS_HOTFILES__ */

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