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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) 2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "fbtl_posix.h"
#include "mpi.h"
#include <unistd.h>
#include <limits.h>
#include "ompi/constants.h"
#include "ompi/mca/fbtl/fbtl.h"
#ifndef IOV_MAX
#define IOV_MAX 1024
#endif
ssize_t mca_fbtl_posix_preadv (mca_io_ompio_file_t *fh )
{
/*int *fp = NULL;*/
int i, block=1;
struct iovec *iov = NULL;
int iov_count = 0;
OMPI_MPI_OFFSET_TYPE iov_offset = 0;
ssize_t bytes_read=0, ret_code=0;
if (NULL == fh->f_io_array) {
return OMPI_ERROR;
}
iov = (struct iovec *) malloc
(OMPIO_IOVEC_INITIAL_SIZE * sizeof (struct iovec));
if (NULL == iov) {
opal_output(1, "OUT OF MEMORY\n");
return OMPI_ERR_OUT_OF_RESOURCE;
}
for (i=0 ; i<fh->f_num_of_io_entries ; i++) {
if (0 == iov_count) {
iov[iov_count].iov_base = fh->f_io_array[i].memory_address;
iov[iov_count].iov_len = fh->f_io_array[i].length;
iov_offset = (OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i].offset;
iov_count ++;
}
if (OMPIO_IOVEC_INITIAL_SIZE*block <= iov_count) {
block ++;
iov = (struct iovec *)realloc
(iov, OMPIO_IOVEC_INITIAL_SIZE * block *
sizeof(struct iovec));
if (NULL == iov) {
opal_output(1, "OUT OF MEMORY\n");
return OMPI_ERR_OUT_OF_RESOURCE;
}
}
if (fh->f_num_of_io_entries != i+1) {
if (((((OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i].offset +
(OPAL_PTRDIFF_TYPE)fh->f_io_array[i].length) ==
(OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i+1].offset)) &&
(iov_count < IOV_MAX ) ){
iov[iov_count].iov_base =
fh->f_io_array[i+1].memory_address;
iov[iov_count].iov_len = fh->f_io_array[i+1].length;
iov_count ++;
continue;
}
}
if (-1 == lseek (fh->fd, iov_offset, SEEK_SET)) {
opal_output(1, "lseek:%s", strerror(errno));
free(iov);
return OMPI_ERROR;
}
ret_code = readv (fh->fd, iov, iov_count);
if ( 0 < ret_code ) {
bytes_read+=ret_code;
}
else if ( ret_code == -1 ) {
opal_output(1, "readv:%s", strerror(errno));
free(iov);
return OMPI_ERROR;
}
else if ( 0 == ret_code ){
/* end of file reached, no point in continue reading; */
break;
}
iov_count = 0;
}
free (iov);
return bytes_read;
}
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