path: root/src/H5FDpublic.h

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * 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 COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Programmer:  Robb Matzke
 *              Monday, July 26, 1999
 */
#ifndef H5FDpublic_H
#define H5FDpublic_H

/* Public headers needed by this file */
#include "H5public.h"  /* Generic Functions */
#include "H5Fpublic.h" /* Files */

/*****************/
/* Public Macros */
/*****************/

#define H5_HAVE_VFL      1 /*define a convenient app feature test*/
#define H5FD_VFD_DEFAULT 0 /* Default VFL driver value */

/* Types of allocation requests: see H5Fpublic.h  */
typedef enum H5F_mem_t H5FD_mem_t;

/* Map "fractal heap" header blocks to 'ohdr' type file memory, since its
 * a fair amount of work to add a new kind of file memory and they are similar
 * enough to object headers and probably too minor to deserve their own type.
 *
 * Map "fractal heap" indirect blocks to 'ohdr' type file memory, since they
 * are similar to fractal heap header blocks.
 *
 * Map "fractal heap" direct blocks to 'lheap' type file memory, since they
 * will be replacing local heaps.
 *
 * Map "fractal heap" 'huge' objects to 'draw' type file memory, since they
 * represent large objects that are directly stored in the file.
 *
 *      -QAK
 */
#define H5FD_MEM_FHEAP_HDR      H5FD_MEM_OHDR
#define H5FD_MEM_FHEAP_IBLOCK   H5FD_MEM_OHDR
#define H5FD_MEM_FHEAP_DBLOCK   H5FD_MEM_LHEAP
#define H5FD_MEM_FHEAP_HUGE_OBJ H5FD_MEM_DRAW

/* Map "free space" header blocks to 'ohdr' type file memory, since its
 * a fair amount of work to add a new kind of file memory and they are similar
 * enough to object headers and probably too minor to deserve their own type.
 *
 * Map "free space" serialized sections to 'lheap' type file memory, since they
 * are similar enough to local heap info.
 *
 *      -QAK
 */
#define H5FD_MEM_FSPACE_HDR   H5FD_MEM_OHDR
#define H5FD_MEM_FSPACE_SINFO H5FD_MEM_LHEAP

/* Map "shared object header message" master table to 'ohdr' type file memory,
 * since its a fair amount of work to add a new kind of file memory and they are
 * similar enough to object headers and probably too minor to deserve their own
 * type.
 *
 * Map "shared object header message" indices to 'btree' type file memory,
 * since they are similar enough to B-tree nodes.
 *
 *      -QAK
 */
#define H5FD_MEM_SOHM_TABLE H5FD_MEM_OHDR
#define H5FD_MEM_SOHM_INDEX H5FD_MEM_BTREE

/* Map "extensible array" header blocks to 'ohdr' type file memory, since its
 * a fair amount of work to add a new kind of file memory and they are similar
 * enough to object headers and probably too minor to deserve their own type.
 *
 * Map "extensible array" index blocks to 'ohdr' type file memory, since they
 * are similar to extensible array header blocks.
 *
 * Map "extensible array" super blocks to 'btree' type file memory, since they
 * are similar enough to B-tree nodes.
 *
 * Map "extensible array" data blocks & pages to 'lheap' type file memory, since
 * they are similar enough to local heap info.
 *
 *      -QAK
 */
#define H5FD_MEM_EARRAY_HDR       H5FD_MEM_OHDR
#define H5FD_MEM_EARRAY_IBLOCK    H5FD_MEM_OHDR
#define H5FD_MEM_EARRAY_SBLOCK    H5FD_MEM_BTREE
#define H5FD_MEM_EARRAY_DBLOCK    H5FD_MEM_LHEAP
#define H5FD_MEM_EARRAY_DBLK_PAGE H5FD_MEM_LHEAP

/* Map "fixed array" header blocks to 'ohdr' type file memory, since its
 * a fair amount of work to add a new kind of file memory and they are similar
 * enough to object headers and probably too minor to deserve their own type.
 *
 * Map "fixed array" data blocks & pages to 'lheap' type file memory, since
 * they are similar enough to local heap info.
 *
 */
#define H5FD_MEM_FARRAY_HDR       H5FD_MEM_OHDR
#define H5FD_MEM_FARRAY_DBLOCK    H5FD_MEM_LHEAP
#define H5FD_MEM_FARRAY_DBLK_PAGE H5FD_MEM_LHEAP

/*
 * A free-list map which maps all types of allocation requests to a single
 * free list.  This is useful for drivers that don't really care about
 * keeping different requests segregated in the underlying file and which
 * want to make most efficient reuse of freed memory.  The use of the
 * H5FD_MEM_SUPER free list is arbitrary.
 */
#define H5FD_FLMAP_SINGLE                                                                                    \
    {                                                                                                        \
        H5FD_MEM_SUPER,     /*default*/                                                                      \
            H5FD_MEM_SUPER, /*super*/                                                                        \
            H5FD_MEM_SUPER, /*btree*/                                                                        \
            H5FD_MEM_SUPER, /*draw*/                                                                         \
            H5FD_MEM_SUPER, /*gheap*/                                                                        \
            H5FD_MEM_SUPER, /*lheap*/                                                                        \
            H5FD_MEM_SUPER  /*ohdr*/                                                                         \
    }

/*
 * A free-list map which segregates requests into `raw' or `meta' data
 * pools.
 */
#define H5FD_FLMAP_DICHOTOMY                                                                                 \
    {                                                                                                        \
        H5FD_MEM_SUPER,     /*default*/                                                                      \
            H5FD_MEM_SUPER, /*super*/                                                                        \
            H5FD_MEM_SUPER, /*btree*/                                                                        \
            H5FD_MEM_DRAW,  /*draw*/                                                                         \
            H5FD_MEM_DRAW,  /*gheap*/                                                                        \
            H5FD_MEM_SUPER, /*lheap*/                                                                        \
            H5FD_MEM_SUPER  /*ohdr*/                                                                         \
    }

/*
 * The default free list map which causes each request type to use it's own
 * free-list.
 */
#define H5FD_FLMAP_DEFAULT                                                                                   \
    {                                                                                                        \
        H5FD_MEM_DEFAULT,     /*default*/                                                                    \
            H5FD_MEM_DEFAULT, /*super*/                                                                      \
            H5FD_MEM_DEFAULT, /*btree*/                                                                      \
            H5FD_MEM_DEFAULT, /*draw*/                                                                       \
            H5FD_MEM_DEFAULT, /*gheap*/                                                                      \
            H5FD_MEM_DEFAULT, /*lheap*/                                                                      \
            H5FD_MEM_DEFAULT  /*ohdr*/                                                                       \
    }

/* Define VFL driver features that can be enabled on a per-driver basis */
/* These are returned with the 'query' function pointer in H5FD_class_t */
/*
 * Defining H5FD_FEAT_AGGREGATE_METADATA for a VFL driver means that
 * the library will attempt to allocate a larger block for metadata and
 * then sub-allocate each metadata request from that larger block.
 */
#define H5FD_FEAT_AGGREGATE_METADATA 0x00000001
/*
 * Defining H5FD_FEAT_ACCUMULATE_METADATA for a VFL driver means that
 * the library will attempt to cache metadata as it is written to the file
 * and build up a larger block of metadata to eventually pass to the VFL
 * 'write' routine.
 *
 * Distinguish between updating the metadata accumulator on writes and
 * reads.  This is particularly (perhaps only, even) important for MPI-I/O
 * where we guarantee that writes are collective, but reads may not be.
 * If we were to allow the metadata accumulator to be written during a
 * read operation, the application would hang.
 */
#define H5FD_FEAT_ACCUMULATE_METADATA_WRITE 0x00000002
#define H5FD_FEAT_ACCUMULATE_METADATA_READ  0x00000004
#define H5FD_FEAT_ACCUMULATE_METADATA                                                                        \
    (H5FD_FEAT_ACCUMULATE_METADATA_WRITE | H5FD_FEAT_ACCUMULATE_METADATA_READ)
/*
 * Defining H5FD_FEAT_DATA_SIEVE for a VFL driver means that
 * the library will attempt to cache raw data as it is read from/written to
 * a file in a "data seive" buffer.  See Rajeev Thakur's papers:
 *  http://www.mcs.anl.gov/~thakur/papers/romio-coll.ps.gz
 *  http://www.mcs.anl.gov/~thakur/papers/mpio-high-perf.ps.gz
 */
#define H5FD_FEAT_DATA_SIEVE 0x00000008
/*
 * Defining H5FD_FEAT_AGGREGATE_SMALLDATA for a VFL driver means that
 * the library will attempt to allocate a larger block for "small" raw data
 * and then sub-allocate "small" raw data requests from that larger block.
 */
#define H5FD_FEAT_AGGREGATE_SMALLDATA 0x00000010
/*
 * Defining H5FD_FEAT_IGNORE_DRVRINFO for a VFL driver means that
 * the library will ignore the driver info that is encoded in the file
 * for the VFL driver.  (This will cause the driver info to be eliminated
 * from the file when it is flushed/closed, if the file is opened R/W).
 */
#define H5FD_FEAT_IGNORE_DRVRINFO 0x00000020
/*
 * Defining the H5FD_FEAT_DIRTY_DRVRINFO_LOAD for a VFL driver means that
 * the library will mark the driver info dirty when the file is opened
 * R/W.  This will cause the driver info to be re-encoded when the file
 * is flushed/closed.
 */
#define H5FD_FEAT_DIRTY_DRVRINFO_LOAD 0x00000040
/*
 * Defining H5FD_FEAT_POSIX_COMPAT_HANDLE for a VFL driver means that
 * the handle for the VFD (returned with the 'get_handle' callback) is
 * of type 'int' and is compatible with POSIX I/O calls.
 */
#define H5FD_FEAT_POSIX_COMPAT_HANDLE 0x00000080
/*
 * Defining H5FD_FEAT_HAS_MPI for a VFL driver means that
 * the driver makes use of MPI communication and code may retrieve
 * communicator/rank information from it
 */
#define H5FD_FEAT_HAS_MPI 0x00000100
/*
 * Defining the H5FD_FEAT_ALLOCATE_EARLY for a VFL driver will force
 * the library to use the H5D_ALLOC_TIME_EARLY on dataset create
 * instead of the default H5D_ALLOC_TIME_LATE
 */
#define H5FD_FEAT_ALLOCATE_EARLY 0x00000200
/*
 * Defining H5FD_FEAT_ALLOW_FILE_IMAGE for a VFL driver means that
 * the driver is able to use a file image in the fapl as the initial
 * contents of a file.
 */
#define H5FD_FEAT_ALLOW_FILE_IMAGE 0x00000400
/*
 * Defining H5FD_FEAT_CAN_USE_FILE_IMAGE_CALLBACKS for a VFL driver
 * means that the driver is able to use callbacks to make a copy of the
 * image to store in memory.
 */
#define H5FD_FEAT_CAN_USE_FILE_IMAGE_CALLBACKS 0x00000800
/*
 * Defining H5FD_FEAT_SUPPORTS_SWMR_IO for a VFL driver means that the
 * driver supports the single-writer/multiple-readers I/O pattern.
 */
#define H5FD_FEAT_SUPPORTS_SWMR_IO 0x00001000
/*
 * Defining H5FD_FEAT_USE_ALLOC_SIZE for a VFL driver
 * means that the library will just pass the allocation size to the
 * the driver's allocation callback which will eventually handle alignment.
 * This is specifically used for the multi/split driver.
 */
#define H5FD_FEAT_USE_ALLOC_SIZE 0x00002000
/*
 * Defining H5FD_FEAT_PAGED_AGGR for a VFL driver
 * means that the driver needs special file space mapping for paged aggregation.
 * This is specifically used for the multi/split driver.
 */
#define H5FD_FEAT_PAGED_AGGR 0x00004000
/*
 * Defining H5FD_FEAT_DEFAULT_VFD_COMPATIBLE for a VFL driver
 * that creates a file which is compatible with the default VFD.
 * Generally, this means that the VFD creates a single file that follows
 * the canonical HDF5 file format.
 * Regarding the Splitter VFD specifically, only drivers with this flag
 * enabled may be used as the Write-Only (W/O) channel driver.
 */
#define H5FD_FEAT_DEFAULT_VFD_COMPATIBLE 0x00008000

/* Forward declaration */
typedef struct H5FD_t H5FD_t;

/* Class information for each file driver */
typedef struct H5FD_class_t {
    const char        *name;
    haddr_t            maxaddr;
    H5F_close_degree_t fc_degree;
    herr_t (*terminate)(void);
    hsize_t (*sb_size)(H5FD_t *file);
    herr_t (*sb_encode)(H5FD_t *file, char *name /*out*/, unsigned char *p /*out*/);
    herr_t (*sb_decode)(H5FD_t *f, const char *name, const unsigned char *p);
    size_t fapl_size;
    void *(*fapl_get)(H5FD_t *file);
    void *(*fapl_copy)(const void *fapl);
    herr_t (*fapl_free)(void *fapl);
    size_t dxpl_size;
    void *(*dxpl_copy)(const void *dxpl);
    herr_t (*dxpl_free)(void *dxpl);
    H5FD_t *(*open)(const char *name, unsigned flags, hid_t fapl, haddr_t maxaddr);
    herr_t (*close)(H5FD_t *file);
    int (*cmp)(const H5FD_t *f1, const H5FD_t *f2);
    herr_t (*query)(const H5FD_t *f1, unsigned long *flags);
    herr_t (*get_type_map)(const H5FD_t *file, H5FD_mem_t *type_map);
    haddr_t (*alloc)(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, hsize_t size);
    herr_t (*free)(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, hsize_t size);
    haddr_t (*get_eoa)(const H5FD_t *file, H5FD_mem_t type);
    herr_t (*set_eoa)(H5FD_t *file, H5FD_mem_t type, haddr_t addr);
    haddr_t (*get_eof)(const H5FD_t *file, H5FD_mem_t type);
    herr_t (*get_handle)(H5FD_t *file, hid_t fapl, void **file_handle);
    herr_t (*read)(H5FD_t *file, H5FD_mem_t type, hid_t dxpl, haddr_t addr, size_t size, void *buffer);
    herr_t (*write)(H5FD_t *file, H5FD_mem_t type, hid_t dxpl, haddr_t addr, size_t size, const void *buffer);
    herr_t (*flush)(H5FD_t *file, hid_t dxpl_id, hbool_t closing);
    herr_t (*truncate)(H5FD_t *file, hid_t dxpl_id, hbool_t closing);
    herr_t (*lock)(H5FD_t *file, hbool_t rw);
    herr_t (*unlock)(H5FD_t *file);
    H5FD_mem_t fl_map[H5FD_MEM_NTYPES];
} H5FD_class_t;

/* A free list is a singly-linked list of address/size pairs. */
typedef struct H5FD_free_t {
    haddr_t             addr;
    hsize_t             size;
    struct H5FD_free_t *next;
} H5FD_free_t;

/*
 * The main datatype for each driver. Public fields common to all drivers
 * are declared here and the driver appends private fields in memory.
 */
struct H5FD_t {
    hid_t               driver_id;     /*driver ID for this file   */
    const H5FD_class_t *cls;           /*constant class info       */
    unsigned long       fileno;        /* File 'serial' number     */
    unsigned            access_flags;  /* File access flags (from create or open) */
    unsigned long       feature_flags; /* VFL Driver feature Flags */
    haddr_t             maxaddr;       /* For this file, overrides class */
    haddr_t             base_addr;     /* Base address for HDF5 data w/in file */

    /* Space allocation management fields */
    hsize_t threshold;  /* Threshold for alignment  */
    hsize_t alignment;  /* Allocation alignment     */
    hbool_t paged_aggr; /* Paged aggregation for file space is enabled or not */
};

/**
 * Define enum for the source of file image callbacks
 */
//! <!-- [H5FD_file_image_op_t_snip] -->
typedef enum {
    H5FD_FILE_IMAGE_OP_NO_OP,
    H5FD_FILE_IMAGE_OP_PROPERTY_LIST_SET,
    /**< Passed to the \p image_malloc and \p image_memcpy callbacks when a
     * file image buffer is to be copied while being set in a file access
     * property list (FAPL)*/
    H5FD_FILE_IMAGE_OP_PROPERTY_LIST_COPY,
    /**< Passed to the \p image_malloc and \p image_memcpy callbacks
     * when a file image buffer is to be copied when a FAPL is copied*/
    H5FD_FILE_IMAGE_OP_PROPERTY_LIST_GET,
    /**<Passed to the \p image_malloc and \p image_memcpy callbacks when
     * a file image buffer is to be copied while being retrieved from a FAPL*/
    H5FD_FILE_IMAGE_OP_PROPERTY_LIST_CLOSE,
    /**<Passed to the \p image_free callback when a file image
     * buffer is to be released during a FAPL close operation*/
    H5FD_FILE_IMAGE_OP_FILE_OPEN,
    /**<Passed to the \p image_malloc and
     * \p image_memcpy callbackswhen a
     * file image buffer is to be copied during a file open operation \n
     * While the file image being opened will typically be copied from a
     * FAPL, this need not always be the case. For example, the core file
     * driver, also known as the memory file driver, takes its initial
     * image from a file.*/
    H5FD_FILE_IMAGE_OP_FILE_RESIZE,
    /**<Passed to the \p image_realloc callback when a file driver needs
     * to resize an image buffer*/
    H5FD_FILE_IMAGE_OP_FILE_CLOSE
    /**<Passed to the \p image_free callback when an image buffer is to
     * be released during a file close operation*/
} H5FD_file_image_op_t;
//! <!-- [H5FD_file_image_op_t_snip] -->

/**
 * Define structure to hold file image callbacks
 */
//! <!-- [H5FD_file_image_callbacks_t_snip] -->
typedef struct {
    /**
     * \param[in] size Size in bytes of the file image buffer to allocate
     * \param[in] file_image_op A value from H5FD_file_image_op_t indicating
     *                          the operation being performed on the file image
     *                          when this callback is invoked
     * \param[in] udata Value passed in in the H5Pset_file_image_callbacks
     *            parameter \p udata
     */
    //! <!-- [image_malloc_snip] -->
    void *(*image_malloc)(size_t size, H5FD_file_image_op_t file_image_op, void *udata);
    //! <!-- [image_malloc_snip] -->
    /**
     * \param[in] dest Address of the destination buffer
     * \param[in] src Address of the source buffer
     * \param[in] file_image_op A value from #H5FD_file_image_op_t indicating
     *                          the operation being performed on the file image
     *                          when this callback is invoked
     * \param[in] udata Value passed in in the H5Pset_file_image_callbacks
     *            parameter \p udata
     */
    //! <!-- [image_memcpy_snip] -->
    void *(*image_memcpy)(void *dest, const void *src, size_t size, H5FD_file_image_op_t file_image_op,
                          void *udata);
    //! <!-- [image_memcpy_snip] -->
    /**
     * \param[in] ptr Pointer to the buffer being reallocated
     * \param[in] file_image_op A value from #H5FD_file_image_op_t indicating
     *                          the operation being performed on the file image
     *                          when this callback is invoked
     * \param[in] udata Value passed in in the H5Pset_file_image_callbacks
     *            parameter \p udata
     */
    //! <!-- [image_realloc_snip] -->
    void *(*image_realloc)(void *ptr, size_t size, H5FD_file_image_op_t file_image_op, void *udata);
    //! <!-- [image_realloc_snip] -->
    /**
     * \param[in] udata Value passed in in the H5Pset_file_image_callbacks
     *            parameter \p udata
     */
    //! <!-- [image_free_snip] -->
    herr_t (*image_free)(void *ptr, H5FD_file_image_op_t file_image_op, void *udata);
    //! <!-- [image_free_snip] -->
    /**
     * \param[in] udata Value passed in in the H5Pset_file_image_callbacks
     *            parameter \p udata
     */
    //! <!-- [udata_copy_snip] -->
    void *(*udata_copy)(void *udata);
    //! <!-- [udata_copy_snip] -->
    /**
     * \param[in] udata Value passed in in the H5Pset_file_image_callbacks
     *            parameter \p udata
     */
    //! <!-- [udata_free_snip] -->
    herr_t (*udata_free)(void *udata);
    //! <!-- [udata_free_snip] -->
    /**
     * \brief The final field in the #H5FD_file_image_callbacks_t struct,
     *        provides a pointer to user-defined data. This pointer will be
     *        passed to the image_malloc, image_memcpy, image_realloc, and
     *        image_free callbacks. Define udata as NULL if no user-defined
     *        data is provided.
     */
    void *udata;
} H5FD_file_image_callbacks_t;
//! <!-- [H5FD_file_image_callbacks_t_snip] -->

#ifdef __cplusplus
extern "C" {
#endif

/* Function prototypes */
H5_DLL hid_t   H5FDregister(const H5FD_class_t *cls);
H5_DLL herr_t  H5FDunregister(hid_t driver_id);
H5_DLL H5FD_t *H5FDopen(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr);
H5_DLL herr_t  H5FDclose(H5FD_t *file);
H5_DLL int     H5FDcmp(const H5FD_t *f1, const H5FD_t *f2);
H5_DLL int     H5FDquery(const H5FD_t *f, unsigned long *flags);
H5_DLL haddr_t H5FDalloc(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, hsize_t size);
H5_DLL herr_t  H5FDfree(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, hsize_t size);
H5_DLL haddr_t H5FDget_eoa(H5FD_t *file, H5FD_mem_t type);
H5_DLL herr_t  H5FDset_eoa(H5FD_t *file, H5FD_mem_t type, haddr_t eoa);
H5_DLL haddr_t H5FDget_eof(H5FD_t *file, H5FD_mem_t type);
H5_DLL herr_t  H5FDget_vfd_handle(H5FD_t *file, hid_t fapl, void **file_handle);
H5_DLL herr_t  H5FDread(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, size_t size,
                        void *buf /*out*/);
H5_DLL herr_t  H5FDwrite(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, size_t size,
                         const void *buf);
H5_DLL herr_t  H5FDflush(H5FD_t *file, hid_t dxpl_id, hbool_t closing);
H5_DLL herr_t  H5FDtruncate(H5FD_t *file, hid_t dxpl_id, hbool_t closing);
H5_DLL herr_t  H5FDlock(H5FD_t *file, hbool_t rw);
H5_DLL herr_t  H5FDunlock(H5FD_t *file);

/**
 * \ingroup H5FD
 *
 * \brief Allows querying a VFD ID for features before the file is opened
 *
 * \param[in] driver_id Virtual File Driver (VFD) ID
 * \param[out] flags VFD flags supported
 *
 * \return \herr_t
 *
 * \details Queries a virtual file driver (VFD) for feature flags. Takes a
 *          VFD hid_t so it can be used before the file is opened. For example,
 *          this could be used to check if a VFD supports SWMR.
 *
 * \note The flags obtained here are just those of the base driver and
 *       do not take any configuration options (e.g., set via a fapl
 *       call) into consideration.
 *
 * \since 1.10.2
 */
H5_DLL herr_t H5FDdriver_query(hid_t driver_id, unsigned long *flags /*out*/);

#ifdef __cplusplus
}
#endif
#endif