/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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:     H5Oflush.c
 *              Aug 19, 2010
 *              Mike McGreevy <mamcgree@hdfgroup.org>
 *
 * Purpose:     Object flush/refresh routines.
 *
 *-------------------------------------------------------------------------
 */

/****************/
/* Module Setup */
/****************/

#include "H5Omodule.h"          /* This source code file is part of the H5O module */

/***********/
/* Headers */
/***********/

#include "H5private.h"      /* Generic Functions */
#include "H5Dprivate.h"     /* Datasets */
#include "H5Eprivate.h"     /* Errors   */
#include "H5Fprivate.h"     /* Files    */
#include "H5Gprivate.h"        /* Groups    */
#include "H5Iprivate.h"        /* IDs    */
#include "H5Opkg.h"         /* Objects  */

/********************/
/* Local Prototypes */
/********************/
static herr_t H5O_oh_tag(const H5O_loc_t *oloc, hid_t dxpl_id, haddr_t *tag);

/*************/
/* Functions */
/*************/


/*-------------------------------------------------------------------------
 * Function:   H5Oflush
 *
 * Purpose:    Flushes all buffers associated with an object to disk.
 *
 * Return:    Non-negative on success, negative on failure
 *
 * Programmer:  Mike McGreevy
 *              May 19, 2010
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Oflush(hid_t obj_id)
{
    H5O_loc_t *oloc;            /* object location */
    void *obj_ptr;		/* Pointer to object */
    const H5O_obj_class_t  *obj_class = NULL;       /* Class of object */
    herr_t ret_value = SUCCEED; /* return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE1("e", "i", obj_id);

    /* Check args */
    if(NULL == (oloc = H5O_get_loc(obj_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an object")

    /* Get the object pointer */
    if(NULL == (obj_ptr = H5I_object(obj_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid object identifier")

    /* Get the object class */
    if(NULL == (obj_class = H5O_obj_class(oloc, H5AC_ind_read_dxpl_id)))
        HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "unable to determine object class")

    /* Flush the object of this class */
    if(obj_class->flush && obj_class->flush(obj_ptr, H5AC_ind_read_dxpl_id) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTFLUSH, FAIL, "unable to flush object")

    /* Flush the object metadata and invoke flush callback */
    if(H5O_flush_common(oloc, obj_id, H5AC_ind_read_dxpl_id) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTFLUSH, FAIL, "unable to flush object and object flush callback")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Oflush() */

/*-------------------------------------------------------------------------
 * Function:    H5O_flush_common
 *
 * Purpose:    	Flushes the object's metadata
 *		Invokes the user-defined callback if there is one.
 *
 * Return:  	Non-negative on success, negative on failure
 *
 * Programmer:  Vailin Choi; Dec 2013
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5O_flush_common(H5O_loc_t *oloc, hid_t obj_id, hid_t dxpl_id)
{
    haddr_t 	tag = 0;
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Retrieve tag for object */
    if(H5O_oh_tag(oloc, dxpl_id, &tag) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTFLUSH, FAIL, "unable to flush object metadata")

    /* Flush metadata based on tag value of the object */
    if(H5F_flush_tagged_metadata(oloc->file, tag, dxpl_id) < 0)
        HGOTO_ERROR(H5E_FILE, H5E_CANTFLUSH, FAIL, "unable to flush tagged metadata")

    /* Check to invoke callback */
    if(H5F_object_flush_cb(oloc->file, obj_id) < 0)
	HGOTO_ERROR(H5E_OHDR, H5E_CANTFLUSH, FAIL, "unable to do object flush callback")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_flush_common() */


/*-------------------------------------------------------------------------
 * Function:    H5O_oh_tag
 *
 * Purpose:     Get object header's address--tag value for the object
 *
 * Return:  	Success:    Non-negative
 *          	Failure:    Negative
 *
 * Programmer: Mike McGreevy
 *             May 19, 2010
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_oh_tag(const H5O_loc_t *oloc, hid_t dxpl_id, haddr_t *tag)
{
    H5O_t       *oh = NULL;             /* Object header */
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Check args */
    HDassert(oloc);

    /* Get object header for object */
    if(NULL == (oh = H5O_protect(oloc, dxpl_id, H5AC__READ_ONLY_FLAG)))
        HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to protect object's object header")

    /* Get object header's address (i.e. the tag value for this object) */
    if(HADDR_UNDEF == (*tag = H5O_OH_GET_ADDR(oh)))
        HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "unable to get address of object header")

done:
    /* Unprotect object header on failure */
    if(oh && H5O_unprotect(oloc, dxpl_id, oh, H5AC__NO_FLAGS_SET) < 0)
        HDONE_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to release object header")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_oh_tag() */


/*-------------------------------------------------------------------------
 * Function:    H5Orefresh
 *
 * Purpose:    Refreshes all buffers associated with an object.
 *
 * Return:    Non-negative on success, negative on failure
 *
 * Programmer:  Mike McGreevy
 *              July 28, 2010
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Orefresh(hid_t oid)
{
    H5O_loc_t *oloc;            /* object location */
    herr_t ret_value = SUCCEED; /* return value */
    
    FUNC_ENTER_API(FAIL)
    H5TRACE1("e", "i", oid);

    /* Check args */
    if((oloc = H5O_get_loc(oid)) == NULL)
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an object")

    /* Private function */
    if(H5O_refresh_metadata(oid, *oloc, H5AC_ind_read_dxpl_id) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "unable to refresh object")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Orefresh() */


/*-------------------------------------------------------------------------
 * Function:    H5O_refresh_metadata
 *
 * Purpose:     Refreshes all buffers associated with an object.
 *
 * Note:	This is based on the original H5O_refresh_metadata() but
 *	        is split into 2 routines.  
 *	        This is done so that H5Fstart_swmr_write() can use these
 *	        2 routines to refresh opened objects.  This may be 
 *	        restored back to the original code when H5Fstart_swmr_write()
 *	        uses a different approach to handle issues with opened objects.	
 *	 	H5Fstart_swmr_write() no longer calls the 1st routine.	(12/24/15)
 *
 * Return:    	Non-negative on success, negative on failure
 *
 * Programmer: Mike McGreevy/Vailin Choi
 *             July 28, 2010/Feb 2014
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5O_refresh_metadata(hid_t oid, H5O_loc_t oloc, hid_t dxpl_id)
{
    H5G_loc_t obj_loc;
    H5O_loc_t obj_oloc;
    H5G_name_t obj_path;
    hbool_t objs_incr = FALSE;          /* Whether the object count in the file was incremented */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* If the file is opened with write access, 
       no need to perform refresh actions. */
    if(H5F_INTENT(oloc.file) & H5F_ACC_RDWR)
	HGOTO_DONE(SUCCEED)

    /* Create empty object location */
    obj_loc.oloc = &obj_oloc;
    obj_loc.path = &obj_path;
    H5G_loc_reset(&obj_loc);

    /* "Fake" another open object in the file, so that it doesn't get closed
     *  if this object is the only thing holding the file open.
     */
    H5F_incr_nopen_objs(oloc.file);
    objs_incr = TRUE;

    /* Close object & evict its metadata */
    if((H5O_refresh_metadata_close(oid, oloc, &obj_loc, dxpl_id)) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "unable to refresh object")

    /* Re-open the object, re-fetching its metadata */
    if((H5O_refresh_metadata_reopen(oid, &obj_loc, dxpl_id, FALSE)) < 0)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "unable to refresh object")

done:
    if(objs_incr)
        H5F_decr_nopen_objs(oloc.file);

    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5O_refresh_metadata() */


/*-------------------------------------------------------------------------
 * Function:    H5O_refresh_metadata_close
 *
 * Purpose:     This is the first part of the original routine H5O_refresh_metadata().
 *		(1) Save object location information.
 *		(2) Handle multiple dataset opens
 *		(3) Get object cork status
 *		(4) Close the object
 *		(5) Flush and evict object metadata
 *		(6) Re-cork the object if needed
 *
 * Return:  Success:    Non-negative
 *          Failure:    Negative
 *
 * Programmer: Mike McGreevy/Vailin Choi
 *             July 28, 2010/Feb 2014
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5O_refresh_metadata_close(hid_t oid, H5O_loc_t oloc, H5G_loc_t *obj_loc, hid_t dxpl_id)
{
    haddr_t tag = 0;
    hbool_t corked;
    herr_t ret_value = SUCCEED;

    FUNC_ENTER_NOAPI(FAIL)
    
    /* Make deep local copy of object's location information */
    if(obj_loc) {
        H5G_loc_t tmp_loc;

        H5G_loc(oid, &tmp_loc);
        H5G_loc_copy(obj_loc, &tmp_loc, H5_COPY_DEEP);
    } /* end if */

    /* Get object's type */
    if(H5I_get_type(oid) == H5I_DATASET) {
	if(H5D_mult_refresh_close(oid, dxpl_id) < 0)
	    HGOTO_ERROR(H5E_DATASET, H5E_CANTOPENOBJ, FAIL, "unable to prepare refresh for dataset")
    }

    /* Retrieve tag for object */
    if(H5O_oh_tag(&oloc, dxpl_id, &tag) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTFLUSH, FAIL, "unable to get object header address")

    /* Get cork status of the object with tag */
    if(H5AC_cork(oloc.file, tag, H5AC__GET_CORKED, &corked) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_SYSTEM, FAIL, "unable to retrieve an object's cork status")

    /* Close the object */
    if(H5I_dec_ref(oid) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to close object")

    /* Flush metadata based on tag value of the object */
    if(H5F_flush_tagged_metadata(oloc.file, tag, dxpl_id) < 0)
        HGOTO_ERROR(H5E_FILE, H5E_CANTFLUSH, FAIL, "unable to flush tagged metadata")

    /* Evict the object's tagged metadata */
    if(H5F_evict_tagged_metadata(oloc.file, tag, dxpl_id) < 0)
        HGOTO_ERROR(H5E_FILE, H5E_CANTFLUSH, FAIL, "unable to evict metadata")

    /* Re-cork object with tag */
    if(corked)
	if(H5AC_cork(oloc.file, tag, H5AC__SET_CORK, &corked) < 0)
	    HGOTO_ERROR(H5E_ATOM, H5E_SYSTEM, FAIL, "unable to cork the object")

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5O_refresh_metadata_close() */


/*-------------------------------------------------------------------------
 * Function:    H5O_refresh_metadata_reopen
 *
 * Purpose:     This is the second part of the original routine H5O_refresh_metadata().
 *		  (1) Re-open object with the saved object location information.
 *		  (2) Re-register object ID with the re-opened object.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer: Mike McGreevy/Vailin Choi
 *             July 28, 2010/Feb 2014
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5O_refresh_metadata_reopen(hid_t oid, H5G_loc_t *obj_loc, hid_t dxpl_id, hbool_t start_swmr)
{
    void *object = NULL;        /* Dataset for this operation */
    H5I_type_t type;
    herr_t ret_value = SUCCEED;

    FUNC_ENTER_NOAPI(FAIL)

    /* Get object's type */
    type = H5I_get_type(oid);

    switch(type) {
        case(H5I_GROUP):

            /* Re-open the group */
            if(NULL == (object = H5G_open(obj_loc, dxpl_id)))
                HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open group")
            break;

        case(H5I_DATATYPE):

            /* Re-open the named datatype */
            if(NULL == (object = H5T_open(obj_loc, dxpl_id)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTOPENOBJ, FAIL, "unable to open named datatype")
            break;

        case(H5I_DATASET):

            /* Re-open the dataset */
            if(NULL == (object = H5D_open(obj_loc, H5P_DATASET_ACCESS_DEFAULT, dxpl_id)))
                HGOTO_ERROR(H5E_DATASET, H5E_CANTOPENOBJ, FAIL, "unable to open dataset")
	    if(!start_swmr) { /* No need to handle multiple opens when H5Fstart_swmr_write() */
		if(H5D_mult_refresh_reopen(object, dxpl_id) < 0)
		    HGOTO_ERROR(H5E_DATASET, H5E_CANTOPENOBJ, FAIL, "unable to finish refresh for dataset")
	    }
            break;

        case(H5I_UNINIT):
        case(H5I_BADID):
        case(H5I_FILE):
        case(H5I_DATASPACE):
        case(H5I_ATTR):
        case(H5I_REFERENCE):
        case(H5I_VFL):
        case(H5I_GENPROP_CLS):
        case(H5I_GENPROP_LST):
        case(H5I_ERROR_CLASS):
        case(H5I_ERROR_MSG):
        case(H5I_ERROR_STACK):
        case(H5I_NTYPES):
        default:
            HGOTO_ERROR(H5E_ARGS, H5E_CANTRELEASE, FAIL, "not a valid file object ID (dataset, group, or datatype)")
        break;

    } /* end switch */

    /* Re-register ID for the object */
    if((H5I_register_with_id(type, object, TRUE, oid)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to re-register object atom")

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5O_refresh_metadata_reopen() */

