path: root/src/H5FDfamily.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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:	Robb Matzke <matzke@llnl.gov>
 *		Monday, November 10, 1997
 *
 * Purpose:	Implements a family of files that acts as a single hdf5
 *		file.  The purpose is to be able to split a huge file on a
 *		64-bit platform, transfer all the <2GB members to a 32-bit
 *		platform, and then access the entire huge file on the 32-bit
 *		platform.
 *
 *		All family members are logically the same size although their
 *		physical sizes may vary.  The logical member size is
 *		determined by looking at the physical size of the first member
 *		when the file is opened.  When creating a file family, the
 *		first member is created with a predefined physical size
 *		(actually, this happens when the file family is flushed, and
 *		can be quite time consuming on file systems that don't
 *		implement holes, like nfs).
 *
 */

/* Interface initialization */
#define H5_INTERFACE_INIT_FUNC	H5FD_family_init_interface


#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Fprivate.h"		/* File access				*/
#include "H5FDprivate.h"	/* File drivers				*/
#include "H5FDfamily.h"         /* Family file driver 			*/
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Pprivate.h"		/* Property lists			*/

#undef MAX
#define MAX(X,Y)	((X)>(Y)?(X):(Y))
#undef MIN
#define MIN(X,Y)	((X)<(Y)?(X):(Y))

/* The driver identification number, initialized at runtime */
static hid_t H5FD_FAMILY_g = 0;

/* The description of a file belonging to this driver. */
typedef struct H5FD_family_t {
    H5FD_t	pub;		/*public stuff, must be first		*/
    hid_t	memb_fapl_id;	/*file access property list for members	*/
    hsize_t	memb_size;	/*actual size of each member file	*/
    hsize_t	pmem_size;	/*member size passed in from property	*/
    unsigned	nmembs;		/*number of family members		*/
    unsigned	amembs;		/*number of member slots allocated	*/
    H5FD_t	**memb;		/*dynamic array of member pointers	*/
    haddr_t	eoa;		/*end of allocated addresses		*/
    char	*name;		/*name generator printf format		*/
    unsigned	flags;		/*flags for opening additional members	*/

    /* Information from properties set by 'h5repart' tool */
    hsize_t	mem_newsize;	/*new member size passed in as private
                                 * property. It's used only by h5repart */
    hbool_t     repart_members; /* Whether to mark the superblock dirty
                                 * when it is loaded, so that the family
                                 * member sizes can be re-encoded       */
} H5FD_family_t;

/* Driver-specific file access properties */
typedef struct H5FD_family_fapl_t {
    hsize_t	memb_size;	/*size of each member			*/
    hid_t	memb_fapl_id;	/*file access property list of each memb*/
} H5FD_family_fapl_t;

/* Callback prototypes */
static herr_t H5FD_family_term(void);
static void *H5FD_family_fapl_get(H5FD_t *_file);
static void *H5FD_family_fapl_copy(const void *_old_fa);
static herr_t H5FD_family_fapl_free(void *_fa);
static hsize_t H5FD_family_sb_size(H5FD_t *_file);
static herr_t H5FD_family_sb_encode(H5FD_t *_file, char *name/*out*/,
		     unsigned char *buf/*out*/);
static herr_t H5FD_family_sb_decode(H5FD_t *_file, const char *name,
                    const unsigned char *buf);
static H5FD_t *H5FD_family_open(const char *name, unsigned flags,
				hid_t fapl_id, haddr_t maxaddr);
static herr_t H5FD_family_close(H5FD_t *_file);
static int H5FD_family_cmp(const H5FD_t *_f1, const H5FD_t *_f2);
static herr_t H5FD_family_query(const H5FD_t *_f1, unsigned long *flags);
static haddr_t H5FD_family_get_eoa(const H5FD_t *_file, H5FD_mem_t type);
static herr_t H5FD_family_set_eoa(H5FD_t *_file, H5FD_mem_t type, haddr_t eoa);
static haddr_t H5FD_family_get_eof(const H5FD_t *_file, H5FD_mem_t type);
static herr_t  H5FD_family_get_handle(H5FD_t *_file, hid_t fapl, void** file_handle);
static herr_t H5FD_family_read(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr,
			       size_t size, void *_buf/*out*/);
static herr_t H5FD_family_write(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr,
				size_t size, const void *_buf);
static herr_t H5FD_family_flush(H5FD_t *_file, hid_t dxpl_id, unsigned closing);
static herr_t H5FD_family_truncate(H5FD_t *_file, hid_t dxpl_id, unsigned closing);
static herr_t H5FD_family_lock(H5FD_t *_file, hbool_t rw);
static herr_t H5FD_family_unlock(H5FD_t *_file);

/* The class struct */
static const H5FD_class_t H5FD_family_g = {
    "family",					/*name			*/
    HADDR_MAX,					/*maxaddr		*/
    H5F_CLOSE_WEAK,				/*fc_degree		*/
    H5FD_family_term,                           /*terminate             */
    H5FD_family_sb_size,			/*sb_size		*/
    H5FD_family_sb_encode,			/*sb_encode		*/
    H5FD_family_sb_decode,			/*sb_decode		*/
    sizeof(H5FD_family_fapl_t),			/*fapl_size		*/
    H5FD_family_fapl_get,			/*fapl_get		*/
    H5FD_family_fapl_copy,			/*fapl_copy		*/
    H5FD_family_fapl_free,			/*fapl_free		*/
    0,						/*dxpl_size		*/
    NULL,					/*dxpl_copy		*/
    NULL,					/*dxpl_free		*/
    H5FD_family_open,				/*open			*/
    H5FD_family_close,				/*close			*/
    H5FD_family_cmp,				/*cmp			*/
    H5FD_family_query,		                /*query			*/
    NULL,					/*get_type_map		*/
    NULL,					/*alloc			*/
    NULL,					/*free			*/
    H5FD_family_get_eoa,			/*get_eoa		*/
    H5FD_family_set_eoa,			/*set_eoa		*/
    H5FD_family_get_eof,			/*get_eof		*/
    H5FD_family_get_handle,                     /*get_handle            */
    H5FD_family_read,				/*read			*/
    H5FD_family_write,				/*write			*/
    H5FD_family_flush,				/*flush			*/
    H5FD_family_truncate,			/*truncate		*/
    H5FD_family_lock,                           /*lock                  */
    H5FD_family_unlock,                         /*unlock                */
    H5FD_FLMAP_DICHOTOMY                        /*fl_map                */
};


/*--------------------------------------------------------------------------
NAME
   H5FD_family_init_interface -- Initialize interface-specific information
USAGE
    herr_t H5FD_family_init_interface()

RETURNS
    Non-negative on success/Negative on failure
DESCRIPTION
    Initializes any interface-specific data or routines.  (Just calls
    H5FD_family_init currently).

--------------------------------------------------------------------------*/
static herr_t
H5FD_family_init_interface(void)
{
    herr_t ret_value = SUCCEED;

    FUNC_ENTER_NOAPI_NOINIT

    if(H5FD_family_init() < 0)
        HGOTO_ERROR(H5E_VFL, H5E_CANTINIT, FAIL, "unable to initialize family VFD")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FD_family_init_interface() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_init
 *
 * Purpose:	Initialize this driver by registering the driver with the
 *		library.
 *
 * Return:	Success:	The driver ID for the family driver.
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5FD_family_init(void)
{
    hid_t ret_value = H5FD_FAMILY_g;   /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    if(H5I_VFL != H5I_get_type(H5FD_FAMILY_g))
        H5FD_FAMILY_g = H5FD_register(&H5FD_family_g, sizeof(H5FD_class_t), FALSE);

    /* Set return value */
    ret_value = H5FD_FAMILY_g;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FD_family_init() */


/*---------------------------------------------------------------------------
 * Function:	H5FD_family_term
 *
 * Purpose:	Shut down the VFD
 *
 * Returns:     Non-negative on success or negative on failure
 *
 * Programmer:  Quincey Koziol
 *              Friday, Jan 30, 2004
 *
 *---------------------------------------------------------------------------
 */
static herr_t
H5FD_family_term(void)
{
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Reset VFL ID */
    H5FD_FAMILY_g=0;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5FD_family_term() */


/*-------------------------------------------------------------------------
 * Function:	H5Pset_fapl_family
 *
 * Purpose:	Sets the file access property list FAPL_ID to use the family
 *		driver. The MEMB_SIZE is the size in bytes of each file
 *		member (used only when creating a new file) and the
 *		MEMB_FAPL_ID is a file access property list to be used for
 *		each family member.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *		Raymond Lu
 * 		Tuesday, Oct 23, 2001
 *		Changed the file access list to the new generic property
 *		list.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Pset_fapl_family(hid_t fapl_id, hsize_t msize, hid_t memb_fapl_id)
{
    herr_t ret_value;
    H5FD_family_fapl_t	fa={0, -1};
    H5P_genplist_t *plist;      /* Property list pointer */

    FUNC_ENTER_API(FAIL)
    H5TRACE3("e", "ihi", fapl_id, msize, memb_fapl_id);


    /* Check arguments */
    if(TRUE != H5P_isa_class(fapl_id, H5P_FILE_ACCESS))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list")
    if(H5P_DEFAULT == memb_fapl_id)
        memb_fapl_id = H5P_FILE_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(memb_fapl_id, H5P_FILE_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access list")

    /*
     * Initialize driver specific information. No need to copy it into the FA
     * struct since all members will be copied by H5P_set_driver().
     */
    fa.memb_size = msize;
    fa.memb_fapl_id = memb_fapl_id;

    if(NULL == (plist = (H5P_genplist_t *)H5I_object(fapl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list")
    ret_value= H5P_set_driver(plist, H5FD_FAMILY, &fa);

done:
    FUNC_LEAVE_API(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5Pget_fapl_family
 *
 * Purpose:	Returns information about the family file access property
 *		list though the function arguments.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *		Raymond Lu
 * 		Tuesday, Oct 23, 2001
 *		Changed the file access list to the new generic property
 *		list.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Pget_fapl_family(hid_t fapl_id, hsize_t *msize/*out*/,
		   hid_t *memb_fapl_id/*out*/)
{
    H5FD_family_fapl_t	*fa;
    H5P_genplist_t *plist;      /* Property list pointer */
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE3("e", "ixx", fapl_id, msize, memb_fapl_id);

    if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access list")
    if(H5FD_FAMILY != H5P_get_driver(plist))
        HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "incorrect VFL driver")
    if(NULL == (fa = (H5FD_family_fapl_t *)H5P_get_driver_info(plist)))
        HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "bad VFL driver info")
    if(msize)
        *msize = fa->memb_size;
    if(memb_fapl_id) {
        if(NULL == (plist = (H5P_genplist_t *)H5I_object(fa->memb_fapl_id)))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access list")
        *memb_fapl_id = H5P_copy_plist(plist, TRUE);
    } /* end if */

done:
    FUNC_LEAVE_API(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_fapl_get
 *
 * Purpose:	Gets a file access property list which could be used to
 *		create an identical file.
 *
 * Return:	Success:	Ptr to new file access property list.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Friday, August 13, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static void *
H5FD_family_fapl_get(H5FD_t *_file)
{
    H5FD_family_t	*file = (H5FD_family_t*)_file;
    H5FD_family_fapl_t	*fa = NULL;
    H5P_genplist_t *plist;      /* Property list pointer */
    void *ret_value;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    if(NULL == (fa = (H5FD_family_fapl_t *)H5MM_calloc(sizeof(H5FD_family_fapl_t))))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

    fa->memb_size = file->memb_size;
    if(NULL == (plist = (H5P_genplist_t *)H5I_object(file->memb_fapl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file access property list")
    fa->memb_fapl_id = H5P_copy_plist(plist, FALSE);

    /* Set return value */
    ret_value=fa;

done:
    if(ret_value==NULL) {
        if(fa!=NULL)
            H5MM_xfree(fa);
    } /* end if */
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_fapl_copy
 *
 * Purpose:	Copies the family-specific file access properties.
 *
 * Return:	Success:	Ptr to a new property list
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static void *
H5FD_family_fapl_copy(const void *_old_fa)
{
    const H5FD_family_fapl_t *old_fa = (const H5FD_family_fapl_t*)_old_fa;
    H5FD_family_fapl_t *new_fa = NULL;
    H5P_genplist_t *plist;      /* Property list pointer */
    void *ret_value;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    if(NULL == (new_fa = (H5FD_family_fapl_t *)H5MM_malloc(sizeof(H5FD_family_fapl_t))))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

    /* Copy the fields of the structure */
    HDmemcpy(new_fa, old_fa, sizeof(H5FD_family_fapl_t));

    /* Deep copy the property list objects in the structure */
    if(old_fa->memb_fapl_id==H5P_FILE_ACCESS_DEFAULT) {
        if(H5I_inc_ref(new_fa->memb_fapl_id, FALSE)<0)
            HGOTO_ERROR(H5E_VFL, H5E_CANTINC, NULL, "unable to increment ref count on VFL driver")
    } /* end if */
    else {
        if(NULL == (plist = (H5P_genplist_t *)H5I_object(old_fa->memb_fapl_id)))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file access property list")
        new_fa->memb_fapl_id = H5P_copy_plist(plist, FALSE);
    } /* end else */

    /* Set return value */
    ret_value=new_fa;

done:
    if(ret_value==NULL) {
        if(new_fa!=NULL)
            H5MM_xfree(new_fa);
    } /* end if */
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_fapl_free
 *
 * Purpose:	Frees the family-specific file access properties.
 *
 * Return:	Success:	0
 *
 *		Failure:	-1
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_fapl_free(void *_fa)
{
    H5FD_family_fapl_t	*fa = (H5FD_family_fapl_t*)_fa;
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    if(H5I_dec_ref(fa->memb_fapl_id) < 0)
        HGOTO_ERROR(H5E_VFL, H5E_CANTDEC, FAIL, "can't close driver ID")
    H5MM_xfree(fa);

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_sb_size
 *
 * Purpose:	Returns the size of the private information to be stored in
 *		the superblock.
 *
 * Return:	Success:	The super block driver data size.
 *
 *		Failure:	never fails
 *
 * Programmer:	Raymond Lu
 *              Tuesday, May 10, 2005
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static hsize_t
H5FD_family_sb_size(H5FD_t H5_ATTR_UNUSED *_file)
{
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* 8 bytes field for the size of member file size field should be
     * enough for now. */
    FUNC_LEAVE_NOAPI(8)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_sb_encode
 *
 * Purpose:	Encode driver information for the superblock. The NAME
 *		argument is a nine-byte buffer which will be initialized with
 *		an eight-character name/version number and null termination.
 *
 *		The encoding is the member file size and name template.
 *
 * Return:	Success:	0
 *
 *		Failure:	-1
 *
 * Programmer:	Raymond Lu
 *              Tuesday, May 10, 2005
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_sb_encode(H5FD_t *_file, char *name/*out*/, unsigned char *buf/*out*/)
{
    H5FD_family_t	*file = (H5FD_family_t*)_file;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Name and version number */
    HDstrncpy(name, "NCSAfami", (size_t)9);
    name[8] = '\0';

    /* Store member file size.  Use the member file size from the property here.
     * This is to guarantee backward compatibility.  If a file is created with
     * v1.6 library and the driver info isn't saved in the superblock.  We open
     * it with v1.8, the FILE->MEMB_SIZE will be the actual size of the first
     * member file (see H5FD_family_open).  So it isn't safe to use FILE->MEMB_SIZE.
     * If the file is created with v1.8, the correctness of FILE->PMEM_SIZE is
     * checked in H5FD_family_sb_decode. SLU - 2009/3/21
     */
    UINT64ENCODE(buf, (uint64_t)file->pmem_size);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5FD_family_sb_encode() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_sb_decode
 *
 * Purpose:	This function has 2 seperate purpose.  One is to decodes the
 *              superblock information for this driver. The NAME argument is
 *              the eight-character (plus null termination) name stored in i
 *              the file.  The FILE argument is updated according to the
 *              information in the superblock.
 *
 * Return:	Success:	0
 *
 *		Failure:	-1
 *
 * Programmer:	Raymond Lu
 *              Tuesday, May 10, 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_sb_decode(H5FD_t *_file, const char H5_ATTR_UNUSED *name, const unsigned char *buf)
{
    H5FD_family_t	*file = (H5FD_family_t*)_file;
    uint64_t            msize;
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Read member file size. Skip name template for now although it's saved. */
    UINT64DECODE(buf, msize);

    /* For h5repart only. Private property of new member size is used to signal
     * h5repart is being used to change member file size.  h5repart will open
     * files for read and write.  When the files are closed, metadata will be
     * flushed to the files and updated to this new size */
    if(file->mem_newsize)
        file->memb_size = file->pmem_size = file->mem_newsize;
    else {
        /* Default - use the saved member size */
        if(file->pmem_size == H5F_FAMILY_DEFAULT)
           file->pmem_size = msize;

        /* Check if member size from file access property is correct */
        if(msize != file->pmem_size) {
            char err_msg[128];

            HDsnprintf(err_msg, sizeof(err_msg), "Family member size should be %lu.  But the size from file access property is %lu", (unsigned long)msize, (unsigned long)file->pmem_size);
            HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, err_msg)
        } /* end if */

        /* Update member file size to the size saved in the superblock.
         * That's the size intended to be. */
        file->memb_size = msize;
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_family_sb_decode() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_open
 *
 * Purpose:	Creates and/or opens a family of files as an HDF5 file.
 *
 * Return:	Success:	A pointer to a new file dat structure. The
 *				public fields will be initialized by the
 *				caller, which is always H5FD_open().
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *              Raymond Lu
 *              Thursday, November 18, 2004
 *              When file is re-opened, member size passed in from access property
 *              is checked to see if it's reasonable.  If there is only 1 member
 *              file, member size can't be smaller than current member size.
 *              If there are at least 2 member files, member size can only be equal
 *              the 1st member size.
 *
 *              Raymond Lu
 *              Tuesday, May 24, 2005
 *              The modification described above has been changed.  The major checking
 *              is done in H5F_read_superblock.  Member file size is saved in the
 *              superblock now.  H5F_read_superblock() reads this saved size and compare
 *              to the size passed in from file access property.  Wrong size will
 *              result in a failure.
 *
 *-------------------------------------------------------------------------
 */
static H5FD_t *
H5FD_family_open(const char *name, unsigned flags, hid_t fapl_id,
		 haddr_t maxaddr)
{
    H5FD_family_t	*file=NULL;
    H5FD_t     		*ret_value=NULL;
    char		memb_name[4096], temp[4096];
    hsize_t		eof=HADDR_UNDEF;
    unsigned		t_flags = flags & ~H5F_ACC_CREAT;

    FUNC_ENTER_NOAPI_NOINIT

    /* Check arguments */
    if(!name || !*name)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid file name")
    if(0 == maxaddr || HADDR_UNDEF == maxaddr)
        HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, NULL, "bogus maxaddr")

    /* Initialize file from file access properties */
    if(NULL == (file = (H5FD_family_t *)H5MM_calloc(sizeof(H5FD_family_t))))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "unable to allocate file struct")
    if(H5P_FILE_ACCESS_DEFAULT==fapl_id) {
        file->memb_fapl_id = H5P_FILE_ACCESS_DEFAULT;
        if(H5I_inc_ref(file->memb_fapl_id, FALSE) < 0)
            HGOTO_ERROR(H5E_VFL, H5E_CANTINC, NULL, "unable to increment ref count on VFL driver")
        file->memb_size = 1024 * 1024 * 1024; /*1GB. Actual member size to be updated later */
        file->pmem_size = 1024 * 1024 * 1024; /*1GB. Member size passed in through property */
        file->mem_newsize = 0;            /*New member size used by h5repart only       */
    } /* end if */
    else {
        H5P_genplist_t      *plist;      /* Property list pointer */
        H5FD_family_fapl_t *fa;

        if(NULL == (plist = (H5P_genplist_t *)H5I_object(fapl_id)))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file access property list")
        if(NULL == (fa = (H5FD_family_fapl_t *)H5P_get_driver_info(plist)))
            HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, NULL, "bad VFL driver info")

        /* Check for new family file size. It's used by h5repart only. */
        if(H5P_exist_plist(plist, H5F_ACS_FAMILY_NEWSIZE_NAME) > 0) {
            /* Get the new family file size */
            if(H5P_get(plist, H5F_ACS_FAMILY_NEWSIZE_NAME, &file->mem_newsize) < 0)
                HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get new family member size")

            /* Set flag for later */
            file->repart_members = TRUE;
        } /* end if */

        if(fa->memb_fapl_id==H5P_FILE_ACCESS_DEFAULT) {
            if(H5I_inc_ref(fa->memb_fapl_id, FALSE)<0)
                HGOTO_ERROR(H5E_VFL, H5E_CANTINC, NULL, "unable to increment ref count on VFL driver")
            file->memb_fapl_id = fa->memb_fapl_id;
        } /* end if */
        else {
            if(NULL == (plist = (H5P_genplist_t *)H5I_object(fa->memb_fapl_id)))
                HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file access property list")
            file->memb_fapl_id = H5P_copy_plist(plist, FALSE);
        } /* end else */
        file->memb_size = fa->memb_size; /* Actual member size to be updated later */
        file->pmem_size = fa->memb_size; /* Member size passed in through property */
    } /* end else */
    file->name = H5MM_strdup(name);
    file->flags = flags;

    /* Check that names are unique */
    HDsnprintf(memb_name, sizeof(memb_name), name, 0);
    HDsnprintf(temp, sizeof(temp), name, 1);
    if(!HDstrcmp(memb_name, temp))
        HGOTO_ERROR(H5E_FILE, H5E_FILEEXISTS, NULL, "file names not unique")

    /* Open all the family members */
    while(1) {
        HDsnprintf(memb_name, sizeof(memb_name), name, file->nmembs);

        /* Enlarge member array */
        if(file->nmembs >= file->amembs) {
            unsigned n = MAX(64, 2 * file->amembs);
            H5FD_t **x;

            HDassert(n > 0);
            if(NULL == (x = (H5FD_t **)H5MM_realloc(file->memb, n * sizeof(H5FD_t *))))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "unable to reallocate members")
            file->amembs = n;
            file->memb = x;
        } /* end if */

        /*
         * Attempt to open file. If the first file cannot be opened then fail;
         * otherwise an open failure means that we've reached the last member.
         * Allow H5F_ACC_CREAT only on the first family member.
         */
        H5E_BEGIN_TRY {
            file->memb[file->nmembs] = H5FDopen(memb_name,
                (0==file->nmembs ? flags : t_flags), file->memb_fapl_id, HADDR_UNDEF);
        } H5E_END_TRY;
        if (!file->memb[file->nmembs]) {
            if (0==file->nmembs)
                HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to open member file")
            H5E_clear_stack(NULL);
            break;
        }
        file->nmembs++;
    }

    /* If the file is reopened and there's only one member file existing, this file maybe
     * smaller than the size specified through H5Pset_fapl_family().  Update the actual
     * member size.
     */
    if ((eof=H5FDget_eof(file->memb[0], H5FD_MEM_DEFAULT))) file->memb_size = eof;

    ret_value=(H5FD_t *)file;

done:
    /* Cleanup and fail */
    if(ret_value == NULL && file != NULL) {
        unsigned nerrors = 0;   /* Number of errors closing member files */
        unsigned u;             /* Local index variable */

        /* Close as many members as possible. Use private function here to avoid clearing
         * the error stack. We need the error message to indicate wrong member file size. */
        for(u = 0; u < file->nmembs; u++)
            if(file->memb[u])
                if(H5FD_close(file->memb[u]) < 0)
                    nerrors++;
        if(nerrors)
            HGOTO_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, NULL, "unable to close member files")

        if(file->memb)
            H5MM_xfree(file->memb);
        if(H5I_dec_ref(file->memb_fapl_id) < 0)
            HDONE_ERROR(H5E_VFL, H5E_CANTDEC, NULL, "can't close driver ID")
        if(file->name)
            H5MM_xfree(file->name);
        H5MM_xfree(file);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_family_open() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_close
 *
 * Purpose:	Closes a family of files.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative with as many members closed as
 *				possible. The only subsequent operation
 *				permitted on the file is a close operation.
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_close(H5FD_t *_file)
{
    H5FD_family_t *file = (H5FD_family_t*)_file;
    unsigned	nerrors = 0;    /* Number of errors while closing member files */
    unsigned	u;              /* Local index variable */
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Close as many members as possible. Use private function here to avoid clearing
     * the error stack. We need the error message to indicate wrong member file size. */
    for(u = 0; u < file->nmembs; u++) {
        if(file->memb[u]) {
            if(H5FD_close(file->memb[u]) < 0)
                nerrors++;
            else
                file->memb[u] = NULL;
        } /* end if */
    } /* end for */
    if(nerrors)
        /* Push error, but keep going*/
        HDONE_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, FAIL, "unable to close member files")

    /* Clean up other stuff */
    if(H5I_dec_ref(file->memb_fapl_id) < 0)
        /* Push error, but keep going*/
        HDONE_ERROR(H5E_VFL, H5E_CANTDEC, FAIL, "can't close driver ID")
    H5MM_xfree(file->memb);
    H5MM_xfree(file->name);
    H5MM_xfree(file);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_family_close() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_cmp
 *
 * Purpose:	Compares two file families to see if they are the same. It
 *		does this by comparing the first member of the two families.
 *
 * Return:	Success:	like strcmp()
 *
 *		Failure:	never fails (arguments were checked by the
 *				caller).
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static int
H5FD_family_cmp(const H5FD_t *_f1, const H5FD_t *_f2)
{
    const H5FD_family_t	*f1 = (const H5FD_family_t*)_f1;
    const H5FD_family_t	*f2 = (const H5FD_family_t*)_f2;
    int ret_value = 0;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    HDassert(f1->nmembs >= 1 && f1->memb[0]);
    HDassert(f2->nmembs >= 1 && f2->memb[0]);

    ret_value = H5FDcmp(f1->memb[0], f2->memb[0]);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_family_cmp() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_query
 *
 * Purpose:	Set the flags that this VFL driver is capable of supporting.
 *              (listed in H5FDpublic.h)
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Friday, August 25, 2000
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static herr_t
H5FD_family_query(const H5FD_t * _file, unsigned long *flags /* out */)
{
    const H5FD_family_t	*file = (const H5FD_family_t*)_file;    /* Family VFD info */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Set the VFL feature flags that this driver supports */
    if(flags) {
        *flags = 0;
        *flags |= H5FD_FEAT_AGGREGATE_METADATA; /* OK to aggregate metadata allocations */
        *flags |= H5FD_FEAT_ACCUMULATE_METADATA; /* OK to accumulate metadata for faster writes. */
        *flags |= H5FD_FEAT_DATA_SIEVE;       /* OK to perform data sieving for faster raw data reads & writes */
        *flags |= H5FD_FEAT_AGGREGATE_SMALLDATA; /* OK to aggregate "small" raw data allocations */

        /* Check for flags that are set by h5repart */
        if(file && file->repart_members)
            *flags |= H5FD_FEAT_DIRTY_DRVRINFO_LOAD; /* Mark the superblock dirty when it is loaded (so the family member sizes are rewritten) */
    } /* end if */

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5FD_family_query() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_get_eoa
 *
 * Purpose:	Returns the end-of-address marker for the file. The EOA
 *		marker is the first address past the last byte allocated in
 *		the format address space.
 *
 * Return:	Success:	The end-of-address-marker
 *
 *		Failure:	HADDR_UNDEF
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *              Raymond Lu
 *              21 Dec. 2006
 *              Added the parameter TYPE.  It's only used for MULTI driver.
 *
 *-------------------------------------------------------------------------
 */
static haddr_t
H5FD_family_get_eoa(const H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type)
{
    const H5FD_family_t	*file = (const H5FD_family_t*)_file;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    FUNC_LEAVE_NOAPI(file->eoa)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_set_eoa
 *
 * Purpose:	Set the end-of-address marker for the file.
 *
 * Return:	Success:	0
 *
 *		Failure:	-1
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *              Raymond Lu
 *              21 Dec. 2006
 *              Added the parameter TYPE.  It's only used for MULTI driver.
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_set_eoa(H5FD_t *_file, H5FD_mem_t type, haddr_t abs_eoa)
{
    H5FD_family_t	*file = (H5FD_family_t*)_file;
    haddr_t		addr = abs_eoa;
    char		memb_name[4096];
    unsigned		u;                      /* Local index variable */
    herr_t              ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    for(u = 0; addr || u < file->nmembs; u++) {

        /* Enlarge member array */
        if(u >= file->amembs) {
            unsigned n = MAX(64, 2 * file->amembs);
            H5FD_t **x = (H5FD_t **)H5MM_realloc(file->memb, n * sizeof(H5FD_t *));

            if(!x)
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "unable to allocate memory block")
            file->amembs = n;
            file->memb = x;
            file->nmembs = u;
        } /* end if */

        /* Create another file if necessary */
        if(u >= file->nmembs || !file->memb[u]) {
            file->nmembs = MAX(file->nmembs, u+1);
            HDsnprintf(memb_name, sizeof(memb_name), file->name, u);
            H5E_BEGIN_TRY {
                H5_CHECK_OVERFLOW(file->memb_size, hsize_t, haddr_t);
                file->memb[u] = H5FDopen(memb_name, file->flags | H5F_ACC_CREAT,
                             file->memb_fapl_id, (haddr_t)file->memb_size);
            } H5E_END_TRY;
            if(NULL == file->memb[u])
                HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "unable to open member file")
        } /* end if */

        /* Set the EOA marker for the member */
        /* (Note compensating for base address addition in internal routine) */
        H5_CHECK_OVERFLOW(file->memb_size, hsize_t, haddr_t);
        if(addr > (haddr_t)file->memb_size) {
            if(H5FD_set_eoa(file->memb[u], type, ((haddr_t)file->memb_size - file->pub.base_addr)) < 0)
                HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to set file eoa")
            addr -= file->memb_size;
        } /* end if */
        else {
            if(H5FD_set_eoa(file->memb[u], type, (addr - file->pub.base_addr)) < 0)
                HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to set file eoa")
            addr = 0;
        } /* end else */
    } /* end for */

    file->eoa = abs_eoa;

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_get_eof
 *
 * Purpose:	Returns the end-of-file marker, which is the greater of
 *		either the total family size or the current EOA marker.
 *
 * Return:	Success:	End of file address, the first address past
 *				the end of the family of files or the current
 *				EOA, whichever is larger.
 *
 *		Failure:      	HADDR_UNDEF
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static haddr_t
H5FD_family_get_eof(const H5FD_t *_file, H5FD_mem_t type)
{
    const H5FD_family_t	*file = (const H5FD_family_t*)_file;
    haddr_t		eof=0;
    int			i;      /* Local index variable */
    haddr_t ret_value;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /*
     * Find the last member that has a non-zero EOF and break out of the loop
     * with `i' equal to that member. If all members have zero EOF then exit
     * loop with i==0.
     */
    HDassert(file->nmembs > 0);
    for(i = (int)file->nmembs - 1; i >= 0; --i) {
        if((eof = H5FD_get_eof(file->memb[i], type)) != 0)
            break;
        if(0 == i)
            break;
    } /* end for */

    /* Adjust for base address for file */
    eof += file->pub.base_addr;

    /*
     * The file size is the number of members before the i'th member plus the
     * size of the i'th member.
     */
    eof += ((unsigned)i)*file->memb_size;

    /* Set return value */
    ret_value = eof;

    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:       H5FD_family_get_handle
 *
 * Purpose:        Returns the file handle of FAMILY file driver.
 *
 * Returns:        Non-negative if succeed or negative if fails.
 *
 * Programmer:     Raymond Lu
 *                 Sept. 16, 2002
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_get_handle(H5FD_t *_file, hid_t fapl, void** file_handle)
{
    H5FD_family_t       *file = (H5FD_family_t *)_file;
    H5P_genplist_t      *plist;
    hsize_t             offset;
    int                 memb;
    herr_t              ret_value;

    FUNC_ENTER_NOAPI_NOINIT

    /* Get the plist structure and family offset */
    if(NULL == (plist = H5P_object_verify(fapl, H5P_FILE_ACCESS)))
        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID")
    if(H5P_get(plist, H5F_ACS_FAMILY_OFFSET_NAME, &offset) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get offset for family driver")

    if(offset > (file->memb_size * file->nmembs))
        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "offset is bigger than file size")
    memb = (int)(offset/file->memb_size);

    ret_value = H5FD_get_vfd_handle(file->memb[memb], fapl, file_handle);

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_read
 *
 * Purpose:	Reads SIZE bytes of data from FILE beginning at address ADDR
 *		into buffer BUF according to data transfer properties in
 *		DXPL_ID.
 *
 * Return:	Success:	Zero. Result is stored in caller-supplied
 *				buffer BUF.
 *
 *		Failure:	-1, contents of buffer BUF are undefined.
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_read(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, size_t size,
		 void *_buf/*out*/)
{
    H5FD_family_t	*file = (H5FD_family_t*)_file;
    unsigned char	*buf = (unsigned char*)_buf;
    haddr_t		sub;
    size_t		req;
    hsize_t             tempreq;
    unsigned		u;              /* Local index variable */
    H5P_genplist_t      *plist;      /* Property list pointer */
    herr_t              ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /*
     * Get the member data transfer property list. If the transfer property
     * list does not belong to this driver then assume defaults
     */
    if(NULL == (plist = (H5P_genplist_t *)H5I_object(dxpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list")

    /* Read from each member */
    while(size > 0) {
        H5_CHECKED_ASSIGN(u, unsigned, addr / file->memb_size, hsize_t);

        sub = addr % file->memb_size;

	/* This check is for mainly for IA32 architecture whose size_t's size
	 * is 4 bytes, to prevent overflow when user application is trying to
	 * write files bigger than 4GB. */
        tempreq = file->memb_size-sub;
  	if(tempreq > SIZET_MAX)
	    tempreq = SIZET_MAX;
        req = MIN(size, (size_t)tempreq);

        HDassert(u<file->nmembs);

        if (H5FDread(file->memb[u], type, dxpl_id, sub, req, buf)<0)
            HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "member file read failed")

        addr += req;
        buf += req;
        size -= req;
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_write
 *
 * Purpose:	Writes SIZE bytes of data to FILE beginning at address ADDR
 *		from buffer BUF according to data transfer properties in
 *		DXPL_ID.
 *
 * Return:	Success:	Zero
 *
 *		Failure:	-1
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_write(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, size_t size,
		  const void *_buf)
{
    H5FD_family_t	*file = (H5FD_family_t*)_file;
    const unsigned char	*buf = (const unsigned char*)_buf;
    haddr_t		sub;
    size_t		req;
    hsize_t             tempreq;
    unsigned		u;      /* Local index variable */
    H5P_genplist_t *plist;      /* Property list pointer */
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /*
     * Get the member data transfer property list. If the transfer property
     * list does not belong to this driver then assume defaults.
     */
    if(NULL == (plist = (H5P_genplist_t *)H5I_object(dxpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list")

    /* Write to each member */
    while (size>0) {
        H5_CHECKED_ASSIGN(u, unsigned, addr / file->memb_size, hsize_t);

        sub = addr % file->memb_size;

        /* This check is for mainly for IA32 architecture whose size_t's size
         * is 4 bytes, to prevent overflow when user application is trying to
         * write files bigger than 4GB. */
        tempreq = file->memb_size-sub;
	if(tempreq > SIZET_MAX)
	    tempreq = SIZET_MAX;
        req = MIN(size, (size_t)tempreq);

        HDassert(u<file->nmembs);

        if (H5FDwrite(file->memb[u], type, dxpl_id, sub, req, buf)<0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "member file write failed")

        addr += req;
        buf += req;
        size -= req;
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_flush
 *
 * Purpose:	Flushes all family members.
 *
 * Return:	Success:	0
 *		Failure:	-1, as many files flushed as possible.
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_flush(H5FD_t *_file, hid_t dxpl_id, unsigned closing)
{
    H5FD_family_t	*file = (H5FD_family_t*)_file;
    unsigned		u, nerrors = 0;
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    for(u = 0; u < file->nmembs; u++)
        if(file->memb[u] && H5FD_flush(file->memb[u], dxpl_id, closing) < 0)
            nerrors++;

    if(nerrors)
        HGOTO_ERROR(H5E_IO, H5E_BADVALUE, FAIL, "unable to flush member files")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_family_flush() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_family_truncate
 *
 * Purpose:	Truncates all family members.
 *
 * Return:	Success:	0
 *
 *		Failure:	-1, as many files truncated as possible.
 *
 * Programmer:	Quincey Koziol
 *              Saturday, February 23, 2008
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_truncate(H5FD_t *_file, hid_t dxpl_id, unsigned closing)
{
    H5FD_family_t	*file = (H5FD_family_t*)_file;
    unsigned		u, nerrors = 0;
    herr_t      	ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    for(u = 0; u < file->nmembs; u++)
        if(file->memb[u] && H5FD_truncate(file->memb[u], dxpl_id, closing) < 0)
            nerrors++;

    if(nerrors)
        HGOTO_ERROR(H5E_IO, H5E_BADVALUE, FAIL, "unable to flush member files")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_family_truncate() */


/*-------------------------------------------------------------------------
 * Function:    H5FD_family_lock
 *
 * Purpose:     To place an advisory lock on a file.
 *              The lock type to apply depends on the parameter "rw":
 *                      TRUE--opens for write: an exclusive lock
 *                      FALSE--opens for read: a shared lock
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Vailin Choi; May 2013
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_lock(H5FD_t *_file, hbool_t rw)
{
    H5FD_family_t *file = (H5FD_family_t *)_file;   	/* VFD file struct */
    unsigned	u, i;      	/* Local index variable */
    herr_t ret_value = SUCCEED;	/* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Place the lock on all the member files */
    for(u = 0; u < file->nmembs; u++) {
        if(file->memb[u]) {
            if(H5FD_lock(file->memb[u], rw) < 0)
		break;
        } /* end if */
    } /* end for */

    if(u < file->nmembs) { /* Try to unlock the member files done before */
	for(i = 0; i < u; i++) {
	    if(H5FD_unlock(file->memb[i]) < 0)
		/* Push error, but keep going*/
		HDONE_ERROR(H5E_IO, H5E_CANTUNLOCK, FAIL, "unable to unlock member files")
	}
	HGOTO_ERROR(H5E_IO, H5E_CANTLOCK, FAIL, "unable to lock member files")
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_family_lock() */

/*-------------------------------------------------------------------------
 * Function:    H5FD_family_unlock
 *
 * Purpose:     To remove the existing lock on the file
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:  Vailin Choi; May 2013
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_family_unlock(H5FD_t *_file)
{
    H5FD_family_t *file = (H5FD_family_t *)_file;   	/* VFD file struct */
    unsigned	u;      	/* Local index variable */
    herr_t ret_value = SUCCEED;	/* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Remove the lock on the member files */
    for(u = 0; u < file->nmembs; u++) {
        if(file->memb[u]) {
            if(H5FD_unlock(file->memb[u]) < 0)
		HGOTO_ERROR(H5E_IO, H5E_CANTUNLOCK, FAIL, "unable to unlock member files")
        } /* end if */
    } /* end for */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_family_unlock() */