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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2011 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2008-2014 University of Houston. All rights reserved.
* Copyright (c) 2017-2018 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
/* This code is based on the PVFS2 ADIO module in ROMIO
* Copyright (C) 1997 University of Chicago.
* See COPYRIGHT notice in top-level directory.
*/
#include "ompi_config.h"
#include "fbtl_pvfs2.h"
#include "mpi.h"
#include <unistd.h>
#include "ompi/constants.h"
#include "ompi/mca/fbtl/fbtl.h"
ssize_t mca_fbtl_pvfs2_preadv (ompio_file_t *fh)
{
int i;
int ret;
size_t k;
int merge = 0;
char *merge_buf = NULL;
size_t merge_length = 0;
OMPI_MPI_OFFSET_TYPE merge_offset = 0;
PVFS_sysresp_io resp_io;
PVFS_Request file_req;
PVFS_Request mem_req;
mca_fs_pvfs2 *pvfs2_fs;
ssize_t total_bytes_read=0;
pvfs2_fs = (mca_fs_pvfs2 *)fh->f_fs_ptr;
if (NULL == fh->f_io_array) {
return OMPI_ERROR;
}
for (i=0 ; i<fh->f_num_of_io_entries ; i++) {
if (fh->f_num_of_io_entries != i+1) {
if (((OMPI_MPI_OFFSET_TYPE)fh->f_io_array[i].offset +
(ptrdiff_t)fh->f_io_array[i].length) ==
(OMPI_MPI_OFFSET_TYPE)fh->f_io_array[i+1].offset) {
if (!merge) {
merge_offset = (OMPI_MPI_OFFSET_TYPE)
fh->f_io_array[i].offset;
merge_length = fh->f_io_array[i].length;
}
merge_length += fh->f_io_array[i+1].length;
merge++;
continue;
}
}
if (merge) {
merge_buf = malloc (merge_length);
ret = PVFS_Request_contiguous (merge_length,
PVFS_BYTE,
&mem_req);
if (ret != 0) {
perror("PVFS_Request_contiguous() error");
return OMPI_ERROR;
}
ret = PVFS_Request_contiguous (merge_length,
PVFS_BYTE,
&file_req);
if (ret != 0) {
perror("PVFS_Request_contiguous() error");
return OMPI_ERROR;
}
ret = PVFS_sys_read (pvfs2_fs->object_ref,
file_req,
merge_offset,
merge_buf,
mem_req,
&(pvfs2_fs->credentials),
&resp_io);
if (ret != 0) {
perror("PVFS_sys_write() error");
return OMPI_ERROR;
}
total_bytes_read += (ssize_t)resp_io.total_completed;
k = 0;
while (merge >= 0) {
memcpy (fh->f_io_array[i-merge].memory_address,
merge_buf + k,
fh->f_io_array[i-merge].length);
k += fh->f_io_array[i-merge].length;
merge --;
}
merge = 0;
merge_offset = 0;
merge_length = 0;
if (NULL != merge_buf) {
free (merge_buf);
merge_buf = NULL;
}
}
else {
ret = PVFS_Request_contiguous (fh->f_io_array[i].length,
PVFS_BYTE,
&mem_req);
if (ret != 0) {
perror("PVFS_Request_contiguous() error");
return OMPI_ERROR;
}
ret = PVFS_Request_contiguous (fh->f_io_array[i].length,
PVFS_BYTE,
&file_req);
if (ret != 0) {
perror("PVFS_Request_contiguous() error");
return OMPI_ERROR;
}
ret = PVFS_sys_read (pvfs2_fs->object_ref,
file_req,
(OMPI_MPI_OFFSET_TYPE)
fh ->f_io_array[i].offset,
fh->f_io_array[i].memory_address,
mem_req,
&(pvfs2_fs->credentials),
&resp_io);
if (ret != 0) {
perror("PVFS_sys_write() error");
return OMPI_ERROR;
}
total_bytes_read += (ssize_t)resp_io.total_completed;
}
}
return total_bytes_read;
}
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