/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:		H5FSprivate.h
 *			May  2 2006
 *			Quincey Koziol <koziol@ncsa.uiuc.edu>
 *
 * Purpose:		Private header for library accessible file free space routines.
 *
 *-------------------------------------------------------------------------
 */

#ifndef _H5FSprivate_H
#define _H5FSprivate_H

/* Include package's public header */
#include "H5FSpublic.h"

/* Private headers needed by this file */
#include "H5Fprivate.h"		/* File access				*/
#include "H5FLprivate.h"	/* Free Lists                           */

/**************************/
/* Library Private Macros */
/**************************/

/* Flags for H5FS_section_class_t 'flags' field */
#define H5FS_CLS_GHOST_OBJ      0x01    /* Objects in this class shouldn't be
                                         *      serialized to the file.
                                         */
#define H5FS_CLS_SEPAR_OBJ      0x02    /* Objects in this class shouldn't
                                         *      participate in merge operations.
                                         */
#define H5FS_CLS_MERGE_SYM      0x04    /* Objects in this class only merge
                                         *      with other objects in this class.
                                         */
#define H5FS_CLS_ADJUST_OK      0x08    /* Objects in this class can be merged
                                         *      without requiring a can_adjust/adjust
                                         *      callback pair.
                                         */

/* Flags for H5FS_add() */
#define H5FS_ADD_DESERIALIZING  0x01    /* Free space is being deserialized
                                         */
#define H5FS_ADD_RETURNED_SPACE 0x02    /* Section was previously allocated
                                         *      and is being returned to the
                                         *      free space manager (usually
                                         *      as a result of freeing an
                                         *      object)
                                         */
#define H5FS_ADD_SKIP_VALID     0x04    /* Don't check validity after adding
                                         *      this section.  (state of the
                                         *      managed sections is in flux)
                                         */

/* Flags for deserialize callback  */
#define H5FS_DESERIALIZE_NO_ADD  0x01   /* Don't add section to free space
                                         *      manager after it's deserialized
                                         *      (its only here for it's side-
                                         *      effects).
                                         */


/****************************/
/* Library Private Typedefs */
/****************************/

/* Free space info (forward decl - defined in H5FSpkg.h) */
typedef struct H5FS_t H5FS_t;

/* Forward declaration free space section info */
typedef struct H5FS_section_info_t H5FS_section_info_t;

/* Free space section class info */
typedef struct H5FS_section_class_t {
    /* Class variables */
    const unsigned type;                /* Type of free space section */
    size_t serial_size;                 /* Size of serialized form of section */
    unsigned flags;                     /* Class flags */
    void *cls_private;                  /* Class private information */

    /* Class methods */
    herr_t (*init_cls)(struct H5FS_section_class_t *, void *);          /* Routine to initialize class-specific settings */
    herr_t (*term_cls)(struct H5FS_section_class_t *);                  /* Routine to terminate class-specific settings */

    /* Object methods */
    herr_t (*add)(H5FS_section_info_t *, unsigned *, void *);       /* Routine called when section is about to be added to manager */
    herr_t (*serialize)(const struct H5FS_section_class_t *, const H5FS_section_info_t *, uint8_t *);        /* Routine to serialize a "live" section into a buffer */
    H5FS_section_info_t *(*deserialize)(const struct H5FS_section_class_t *, hid_t dxpl_id, const uint8_t *, haddr_t, hsize_t, unsigned *);     /* Routine to deserialize a buffer into a "live" section */
    htri_t (*can_merge)(const H5FS_section_info_t *, const H5FS_section_info_t *, void *);  /* Routine to determine if two nodes are mergable */
    herr_t (*merge)(H5FS_section_info_t *, H5FS_section_info_t *, void *);      /* Routine to merge two nodes */
    htri_t (*can_shrink)(const H5FS_section_info_t *, void *);        /* Routine to determine if node can shrink container */
    herr_t (*shrink)(H5FS_section_info_t **, void *);   /* Routine to shrink container */
    herr_t (*free)(H5FS_section_info_t *);              /* Routine to free node */
    herr_t (*valid)(const struct H5FS_section_class_t *, const H5FS_section_info_t *);   /* Routine to check if a section is valid */
    H5FS_section_info_t *(*split)(H5FS_section_info_t *, hsize_t);     /* Routine to create the split section */
    herr_t (*debug)(const H5FS_section_info_t *, FILE *, int , int );   /* Routine to dump debugging information about a section */
} H5FS_section_class_t;

/* State of section ("live" or "serialized") */
typedef enum H5FS_section_state_t {
    H5FS_SECT_LIVE,             /* Section has "live" memory references */
    H5FS_SECT_SERIALIZED        /* Section is in "serialized" form */
} H5FS_section_state_t;

/* Free space section info */
struct H5FS_section_info_t {
    haddr_t     addr;                   /* Offset of free space section in the address space */
    hsize_t     size;                   /* Size of free space section */
    unsigned    type;                   /* Type of free space section (i.e. class) */
    H5FS_section_state_t state;         /* Whether the section is in "serialized" or "live" form */
};

/* Free space client IDs for identifying user of free space */
typedef enum H5FS_client_t {
    H5FS_CLIENT_FHEAP_ID = 0,	/* Free space is used by fractal heap */
    H5FS_CLIENT_FILE_ID,	/* Free space is used by file */
    H5FS_NUM_CLIENT_ID          /* Number of free space client IDs (must be last)   */
} H5FS_client_t;

/* Free space creation parameters */
typedef struct H5FS_create_t {
    H5FS_client_t client;               /* Client's ID */
    unsigned shrink_percent;            /* Percent of "normal" serialized size to shrink serialized space at */
    unsigned expand_percent;            /* Percent of "normal" serialized size to expand serialized space at */
    unsigned max_sect_addr;             /* Size of address space free sections are within (log2 of actual value) */
    hsize_t max_sect_size;              /* Maximum size of section to track */
} H5FS_create_t;

/* Free space statistics info */
typedef struct H5FS_stat_t {
    hsize_t tot_space;          /* Total amount of space tracked              */
    hsize_t tot_sect_count;     /* Total # of sections tracked                */
    hsize_t serial_sect_count;  /* # of serializable sections tracked         */
    hsize_t ghost_sect_count;   /* # of un-serializable sections tracked      */
    haddr_t addr;		/* Address of free space header on disk       */
    hsize_t hdr_size;		/* Size of the free-space header on disk      */
    haddr_t sect_addr;          /* Address of the section info in the file    */
    hsize_t alloc_sect_size;    /* Allocated size of the section info in the file */
    hsize_t sect_size;    	/* Size of the section info in the file       */
} H5FS_stat_t;

/* Typedef for iteration operations */
typedef herr_t (*H5FS_operator_t)(const H5FS_section_info_t *sect,
        void *operator_data/*in,out*/);


/*****************************/
/* Library-private Variables */
/*****************************/

/* Declare a free list to manage the H5FS_section_class_t sequence information */
H5FL_SEQ_EXTERN(H5FS_section_class_t);


/***************************************/
/* Library-private Function Prototypes */
/***************************************/

/* Free space manager routines */
H5_DLL H5FS_t *H5FS_create(H5F_t *f, hid_t dxpl_id, haddr_t *fs_addr,
    const H5FS_create_t *fs_create, size_t nclasses,
    const H5FS_section_class_t *classes[], void *cls_init_udata, hsize_t alignment, hsize_t threshold);
H5_DLL H5FS_t *H5FS_open(H5F_t *f, hid_t dxpl_id, haddr_t fs_addr,
    size_t nclasses, const H5FS_section_class_t *classes[], void *cls_init_udata, hsize_t alignment, hsize_t threshold);
H5_DLL herr_t H5FS_size(const H5F_t *f, const H5FS_t *fspace, hsize_t *meta_size);
H5_DLL herr_t H5FS_delete(H5F_t *f, hid_t dxpl_id, haddr_t fs_addr);
H5_DLL herr_t H5FS_close(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace);

/* Free space section routines */
H5_DLL herr_t H5FS_sect_add(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace,
    H5FS_section_info_t *node, unsigned flags, void *op_data);
H5_DLL htri_t H5FS_sect_try_extend(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace,
    haddr_t addr, hsize_t size, hsize_t extra_requested);
H5_DLL herr_t H5FS_sect_remove(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace,
    H5FS_section_info_t *node);
H5_DLL htri_t H5FS_sect_find(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace,
    hsize_t request, H5FS_section_info_t **node);
H5_DLL herr_t H5FS_sect_iterate(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace, H5FS_operator_t op, void *op_data);
H5_DLL herr_t H5FS_sect_stats(const H5FS_t *fspace, hsize_t *tot_space,
    hsize_t *nsects);
H5_DLL herr_t H5FS_sect_change_class(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace,
    H5FS_section_info_t *sect, unsigned new_class);

/* Statistics routine */
H5_DLL herr_t H5FS_stat_info(const H5F_t *f, const H5FS_t *frsp, H5FS_stat_t *stats);

/* Debugging routines for dumping file structures */
H5_DLL herr_t H5FS_debug(H5F_t *f, hid_t dxpl_id, haddr_t addr,
    FILE *stream, int indent, int fwidth);
H5_DLL herr_t H5FS_sects_debug(H5F_t *f, hid_t dxpl_id, haddr_t addr,
    FILE *stream, int indent, int fwidth, haddr_t fs_addr, haddr_t client_addr);
H5_DLL herr_t H5FS_sect_debug(const H5FS_t *fspace, const H5FS_section_info_t *sect,
    FILE *stream, int indent, int fwidth);

#endif /* _H5FSprivate_H */

