path: root/src/H5Fpkg.h

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Programmer:	Quincey Koziol <koziol@ncsa.uiuc.edu>
 *		Thursday, September 28, 2000
 *
 * Purpose:	This file contains declarations which are visible only within
 *		the H5F package.  Source files outside the H5F package should
 *		include H5Fprivate.h instead.
 */
#ifndef H5F_PACKAGE
#error "Do not include this file outside the H5F package!"
#endif

#ifndef _H5Fpkg_H
#define _H5Fpkg_H

/* Get package's private header */
#include "H5Fprivate.h"

/* Other public headers needed by this file */
#include "H5Bpublic.h"          /* B-tree header, for H5B_NUM_BTREE_ID */

/* Other private headers needed by this file */
#include "H5private.h"		/* Generic Functions			*/
#include "H5ACprivate.h"        /* Metadata cache                       */
#include "H5FLprivate.h"	/* Free Lists                           */
#include "H5FOprivate.h"        /* File objects                         */
#include "H5FSprivate.h"	/* File free space                      */
#include "H5Gprivate.h"		/* Groups 			  	*/
#include "H5Oprivate.h"         /* Object header messages               */
#include "H5RCprivate.h"	/* Reference counted object functions	*/


/*
 * Feature: Define this constant on the compiler command-line if you want to
 *	    see some debugging messages on the debug stream.
 */
#ifdef NDEBUG
#  undef H5F_DEBUG
#endif

/* Define the HDF5 file signature */
#define H5F_SIGNATURE	  "\211HDF\r\n\032\n"
#define H5F_SIGNATURE_LEN 8

/* Superblock status flags */
#define H5F_SUPER_WRITE_ACCESS          0x01
#define H5F_SUPER_FILE_OK               0x02
#define H5F_SUPER_ALL_FLAGS             (H5F_SUPER_WRITE_ACCESS | H5F_SUPER_FILE_OK)

/* Mask for removing private file access flags */
#define H5F_ACC_PUBLIC_FLAGS 	        0x001fu

/* Free space section+aggregator merge flags */
#define H5F_FS_MERGE_METADATA           0x01    /* Section can merge with metadata aggregator */
#define H5F_FS_MERGE_RAWDATA            0x02    /* Section can merge with small 'raw' data aggregator */

/* Macro to abstract checking whether file is using a free space manager */
#define H5F_HAVE_FREE_SPACE_MANAGER(F)  TRUE    /* Currently always have a free space manager */

/* Macros for encoding/decoding superblock */
#define H5F_MAX_DRVINFOBLOCK_SIZE  1024         /* Maximum size of superblock driver info buffer */
#define H5F_DRVINFOBLOCK_HDR_SIZE 16            /* Size of superblock driver info header */

/* Superblock sizes for various versions */
#define H5F_SIZEOF_CHKSUM 4     /* Checksum size in the file */

/* Fixed-size portion at the beginning of all superblocks */
#define H5F_SUPERBLOCK_FIXED_SIZE ( H5F_SIGNATURE_LEN                   \
        + 1) /* superblock version */

/* Macros for computing variable-size superblock size */
#define H5F_SUPERBLOCK_VARLEN_SIZE_COMMON                               \
        (2  /* freespace, and root group versions */			\
        + 1 /* reserved */                                              \
        + 3 /* shared header vers, size of address, size of lengths */  \
        + 1 /* reserved */                                              \
        + 4 /* group leaf k, group internal k */                        \
        + 4) /* consistency flags */
#define H5F_SUPERBLOCK_VARLEN_SIZE_V0(f)                                \
        ( H5F_SUPERBLOCK_VARLEN_SIZE_COMMON /* Common variable-length info */ \
        + H5F_SIZEOF_ADDR(f) /* base address */                         \
        + H5F_SIZEOF_ADDR(f) /* <unused> */				\
        + H5F_SIZEOF_ADDR(f) /* EOF address */                          \
        + H5F_SIZEOF_ADDR(f) /* driver block address */                 \
        + H5G_SIZEOF_ENTRY(f)) /* root group ptr */
#define H5F_SUPERBLOCK_VARLEN_SIZE_V1(f)                                \
        ( H5F_SUPERBLOCK_VARLEN_SIZE_COMMON /* Common variable-length info */ \
        + 2 /* indexed B-tree internal k */                             \
        + 2 /* reserved */                                              \
        + H5F_SIZEOF_ADDR(f) /* base address */                         \
        + H5F_SIZEOF_ADDR(f) /* <unused> */				\
        + H5F_SIZEOF_ADDR(f) /* EOF address */                          \
        + H5F_SIZEOF_ADDR(f) /* driver block address */                 \
        + H5G_SIZEOF_ENTRY(f)) /* root group ptr */
#define H5F_SUPERBLOCK_VARLEN_SIZE_V2(f)                                \
        ( 2 /* size of address, size of lengths */                      \
        + 1 /* consistency flags */                                     \
        + H5F_SIZEOF_ADDR(f) /* base address */                         \
        + H5F_SIZEOF_ADDR(f) /* superblock extension address */         \
        + H5F_SIZEOF_ADDR(f) /* EOF address */                          \
        + H5F_SIZEOF_ADDR(f) /* root group object header address */     \
        + H5F_SIZEOF_CHKSUM) /* superblock checksum (keep this last) */
#define H5F_SUPERBLOCK_VARLEN_SIZE(v, f) (				\
        (v == 0 ? H5F_SUPERBLOCK_VARLEN_SIZE_V0(f) : 0)			\
        + (v == 1 ? H5F_SUPERBLOCK_VARLEN_SIZE_V1(f) : 0)               \
        + (v == 2 ? H5F_SUPERBLOCK_VARLEN_SIZE_V2(f) : 0))

/* Total size of superblock, depends on superblock version */
#define H5F_SUPERBLOCK_SIZE(v, f) ( H5F_SUPERBLOCK_FIXED_SIZE           \
        + H5F_SUPERBLOCK_VARLEN_SIZE(v, f))


/* Structure for metadata & "small [raw] data" block aggregation fields */
struct H5F_blk_aggr_t {
    unsigned long       feature_flag;   /* Feature flag type */
    hsize_t             alloc_size;     /* Size for allocating new blocks */
    hsize_t             tot_size;       /* Total amount of bytes aggregated into block */
    hsize_t             size;           /* Current size of block left */
    haddr_t             addr;           /* Location of block left */
};

/* Structure for metadata accumulator fields */
typedef struct H5F_meta_accum_t {
    unsigned char      *buf;            /* Buffer to hold the accumulated metadata */
    haddr_t             loc;            /* File location (offset) of the accumulated metadata */
    size_t              size;           /* Size of the accumulated metadata buffer used (in bytes) */
    size_t              alloc_size;     /* Size of the accumulated metadata buffer allocated (in bytes) */
    size_t              dirty_off;      /* Offset of the dirty region in the accumulator buffer */
    size_t              dirty_len;      /* Length of the dirty region in the accumulator buffer */
    hbool_t             dirty;          /* Flag to indicate that the accumulated metadata is dirty */
} H5F_meta_accum_t;

/* Enum for free space manager state */
typedef enum H5F_fs_state_t {
    H5F_FS_STATE_CLOSED,                /* Free space manager is closed */
    H5F_FS_STATE_OPEN,                  /* Free space manager has been opened */
    H5F_FS_STATE_DELETING               /* Free space manager is being deleted */
} H5F_fs_state_t;

/* A record of the mount table */
typedef struct H5F_mount_t {
    struct H5G_t	*group;	/* Mount point group held open		*/
    struct H5F_t	*file;	/* File mounted at that point		*/
} H5F_mount_t;

/*
 * The mount table describes what files are attached to (mounted on) the file
 * to which this table belongs.
 */
typedef struct H5F_mtab_t {
    unsigned		nmounts;/* Number of children which are mounted	*/
    unsigned		nalloc;	/* Number of mount slots allocated	*/
    H5F_mount_t		*child;	/* An array of mount records		*/
} H5F_mtab_t;

/* Structure specifically to store superblock. This was originally
 * maintained entirely within H5F_file_t, but is now extracted
 * here because the superblock is now handled by the cache */
typedef struct H5F_super_t {
    H5AC_info_t cache_info;     /* Cache entry information structure          */
    unsigned    super_vers;     /* Superblock version                         */
    uint8_t     status_flags;   /* File status flags                          */
    unsigned    sym_leaf_k;     /* Size of leaves in symbol tables            */
    unsigned    btree_k[H5B_NUM_BTREE_ID]; /* B-tree key values for each type */
    haddr_t     base_addr;      /* Absolute base address for rel.addrs.       */
                                /* (superblock for file is at this offset)    */
    haddr_t     ext_addr;       /* Relative address of superblock extension   */
    haddr_t     driver_addr;    /* File driver information block address      */
    haddr_t     root_addr;      /* Root group address                         */
    H5G_entry_t *root_ent;      /* Root group symbol table entry              */
} H5F_super_t;

/*
 * Define the structure to store the file information for HDF5 files. One of
 * these structures is allocated per file, not per H5Fopen(). That is, set of
 * H5F_t structs can all point to the same H5F_file_t struct. The `nrefs'
 * count in this struct indicates the number of H5F_t structs which are
 * pointing to this struct.
 */
typedef struct H5F_file_t {
    H5FD_t	*lf; 		/* Lower level file handle for I/O	*/
    H5F_super_t *sblock;        /* Pointer to (pinned) superblock for file */
    unsigned	nrefs;		/* Ref count for times file is opened	*/
    unsigned	flags;		/* Access Permissions for file          */
    H5F_mtab_t	mtab;		/* File mount table                     */

    /* Cached values from FCPL/superblock */
    uint8_t	sizeof_addr;	/* Size of addresses in file            */
    uint8_t	sizeof_size;	/* Size of offsets in file              */
    haddr_t	sohm_addr;	/* Relative address of shared object header message table */
    unsigned	sohm_vers;	/* Version of shared message table on disk */
    unsigned	sohm_nindexes;	/* Number of shared messages indexes in the table */
    unsigned long feature_flags; /* VFL Driver feature Flags            */
    haddr_t	maxaddr;	/* Maximum address for file             */

    H5AC_t      *cache;		/* The object cache	 		*/
    H5AC_cache_config_t
		mdc_initCacheCfg; /* initial configuration for the      */
                                /* metadata cache.  This structure is   */
                                /* fixed at creation time and should    */
                                /* not change thereafter.               */
    hid_t       fcpl_id;	/* File creation property list ID 	*/
    H5F_close_degree_t fc_degree;   /* File close behavior degree	*/
    size_t	rdcc_nslots;	/* Size of raw data chunk cache (slots)	*/
    size_t	rdcc_nbytes;	/* Size of raw data chunk cache	(bytes)	*/
    double	rdcc_w0;	/* Preempt read chunks first? [0.0..1.0]*/
    size_t      sieve_buf_size; /* Size of the data sieve buffer allocated (in bytes) */
    hsize_t	threshold;	/* Threshold for alignment		*/
    hsize_t	alignment;	/* Alignment				*/
    unsigned	gc_ref;		/* Garbage-collect references?		*/
    hbool_t	latest_format;	/* Always use the latest format?	*/
    hbool_t	store_msg_crt_idx;  /* Store creation index for object header messages?	*/
    unsigned	ncwfs;		/* Num entries on cwfs list		*/
    struct H5HG_heap_t **cwfs;	/* Global heap cache			*/
    struct H5G_t *root_grp;	/* Open root group			*/
    H5FO_t *open_objs;          /* Open objects in file                 */
    H5RC_t *grp_btree_shared;   /* Ref-counted group B-tree node info   */

    /* File space allocation information */
    hbool_t     use_tmp_space;  /* Whether temp. file space allocation is allowed */
    haddr_t	tmp_addr;       /* Next address to use for temp. space in the file */
    unsigned fs_aggr_merge[H5FD_MEM_NTYPES];    /* Flags for whether free space can merge with aggregator(s) */
    H5F_fs_state_t fs_state[H5FD_MEM_NTYPES];   /* State of free space manager for each type */
    haddr_t fs_addr[H5FD_MEM_NTYPES];   /* Address of free space manager info for each type */
    H5FS_t *fs_man[H5FD_MEM_NTYPES];    /* Free space manager for each file space type */
    H5FD_mem_t fs_type_map[H5FD_MEM_NTYPES]; /* Mapping of "real" file space type into tracked type */
    H5F_blk_aggr_t meta_aggr;   /* Metadata aggregation info */
                                /* (if aggregating metadata allocations) */
    H5F_blk_aggr_t sdata_aggr;  /* "Small data" aggregation info */
                                /* (if aggregating "small data" allocations) */

    /* Metadata accumulator information */
    H5F_meta_accum_t accum;     /* Metadata accumulator info           	*/
} H5F_file_t;

/*
 * This is the top-level file descriptor.  One of these structures is
 * allocated every time H5Fopen() is called although they may contain pointers
 * to shared H5F_file_t structs.
 */
struct H5F_t {
    unsigned		intent;		/* The flags passed to H5F_open()*/
    char		*open_name;	/* Name used to open file	*/
    char		*actual_name;	/* Actual name of the file, after resolving symlinks, etc. */
    char               	*extpath;       /* Path for searching target external link file */
    H5F_file_t		*shared;	/* The shared file info		*/
    unsigned		nopen_objs;	/* Number of open object headers*/
    H5FO_t              *obj_count;     /* # of time each object is opened through top file structure */
    hid_t               file_id;        /* ID of this file              */
    hbool_t             closing;        /* File is in the process of being closed */
    struct H5F_t        *parent;        /* Parent file that this file is mounted to */
    unsigned            nmounts;        /* Number of children mounted to this file */
};


/*****************************/
/* Package Private Variables */
/*****************************/

/* Declare a free list to manage the H5F_t struct */
H5FL_EXTERN(H5F_t);

/* Declare a free list to manage the H5F_file_t struct */
H5FL_EXTERN(H5F_file_t);

H5_DLLVAR const H5AC_class_t H5AC_SUPERBLOCK[1];


/******************************/
/* Package Private Prototypes */
/******************************/

/* General routines */
H5_DLL herr_t H5F_init(void);
H5_DLL haddr_t H5F_locate_signature(H5FD_t *file, hid_t dxpl_id);
H5_DLL herr_t H5F_flush(H5F_t *f, hid_t dxpl_id);

/* File mount related routines */
H5_DLL herr_t H5F_close_mounts(H5F_t *f);
H5_DLL int H5F_term_unmount_cb(void *obj_ptr, hid_t obj_id, void *key);
H5_DLL herr_t H5F_mount_count_ids(H5F_t *f, unsigned *nopen_files, unsigned *nopen_objs);
H5_DLL herr_t H5F_flush_mounts(H5F_t *f, hid_t dxpl_id);

/* Superblock related routines */
H5_DLL herr_t H5F_super_init(H5F_t *f, hid_t dxpl_id);
H5_DLL herr_t H5F_super_read(H5F_t *f, hid_t dxpl_id);
H5_DLL herr_t H5F_super_size(H5F_t *f, hid_t dxpl_id, hsize_t *super_size,
    hsize_t *super_ext_info);
H5_DLL herr_t H5F_super_free(H5F_super_t *sblock);

/* Superblock extension related routines */
H5_DLL herr_t H5F_super_ext_open(H5F_t *f, haddr_t ext_addr, H5O_loc_t *ext_ptr);
H5_DLL herr_t H5F_super_ext_write_msg(H5F_t *f, hid_t dxpl_id, void *mesg, unsigned id, hbool_t may_create);
H5_DLL herr_t H5F_super_ext_close(H5F_t *f, H5O_loc_t *ext_ptr);

/* Metadata accumulator routines */
H5_DLL htri_t H5F_accum_read(const H5F_t *f, hid_t dxpl_id, H5FD_mem_t type,
    haddr_t addr, size_t size, void *buf);
H5_DLL htri_t H5F_accum_write(const H5F_t *f, hid_t dxpl_id, H5FD_mem_t type,
    haddr_t addr, size_t size, const void *buf);
H5_DLL herr_t H5F_accum_free(H5F_t *f, hid_t dxpl_id, H5FD_mem_t type,
    haddr_t addr, hsize_t size);
H5_DLL herr_t H5F_accum_flush(H5F_t *f, hid_t dxpl_id);
H5_DLL herr_t H5F_accum_reset(H5F_t *f, hid_t dxpl_id);

/* Shared file list related routines */
H5_DLL herr_t H5F_sfile_add(H5F_file_t *shared);
H5_DLL H5F_file_t * H5F_sfile_search(H5FD_t *lf);
H5_DLL herr_t H5F_sfile_remove(H5F_file_t *shared);

/* Testing functions */
#ifdef H5F_TESTING
H5_DLL herr_t H5F_get_sohm_mesg_count_test(hid_t fid, unsigned type_id,
    size_t *mesg_count);
H5_DLL herr_t H5F_check_cached_stab_test(hid_t file_id);
H5_DLL herr_t H5F_get_maxaddr_test(hid_t file_id, haddr_t *maxaddr);
#endif /* H5F_TESTING */

#endif /* _H5Fpkg_H */