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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) 2008-2021 University of Houston. All rights reserved.
* Copyright (c) 2015-2018 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2022 IBM Corporation. All rights reserved
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "fbtl_posix.h"
#include <unistd.h>
#include <sys/uio.h>
#if HAVE_AIO_H
#include <aio.h>
#endif
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/mca/fbtl/fbtl.h"
#define MAX_ATTEMPTS 10
ssize_t mca_fbtl_posix_ipreadv (ompio_file_t *fh,
ompi_request_t *request)
{
#if defined (FBTL_POSIX_HAVE_AIO)
mca_fbtl_posix_request_data_t *data;
mca_ompio_request_t *req = (mca_ompio_request_t *) request;
int i=0, ret;
off_t start_offset, end_offset, total_length;
data = (mca_fbtl_posix_request_data_t *) malloc ( sizeof (mca_fbtl_posix_request_data_t));
if ( NULL == data ) {
opal_output (1,"mca_fbtl_posix_ipreadv: could not allocate memory\n");
return 0;
}
data->aio_req_count = fh->f_num_of_io_entries;
data->aio_open_reqs = fh->f_num_of_io_entries;
data->aio_req_type = FBTL_POSIX_READ;
data->aio_req_chunks = ompi_fbtl_posix_max_aio_active_reqs;
data->aio_total_len = 0;
data->aio_reqs = (struct aiocb *) malloc (sizeof(struct aiocb) *
fh->f_num_of_io_entries);
if (NULL == data->aio_reqs) {
opal_output(1, "mca_fbtl_posix_ipreadv: could not allocate memory\n");
free(data);
return 0;
}
data->aio_req_status = (int *) malloc (sizeof(int) * fh->f_num_of_io_entries);
if (NULL == data->aio_req_status) {
opal_output(1, "mca_fbtl_posix_ipreadv: could not allocate memory\n");
free(data->aio_reqs);
free(data);
return 0;
}
data->aio_lock_counter = 0;
data->aio_fh = fh;
if ( fh->f_atomicity ) {
OMPIO_SET_ATOMICITY_LOCK(fh, data->aio_lock, data->aio_lock_counter, F_RDLCK);
}
for ( i=0; i<fh->f_num_of_io_entries; i++ ) {
data->aio_reqs[i].aio_offset = (OMPI_MPI_OFFSET_TYPE)(intptr_t)
fh->f_io_array[i].offset;
data->aio_reqs[i].aio_buf = fh->f_io_array[i].memory_address;
data->aio_reqs[i].aio_nbytes = fh->f_io_array[i].length;
data->aio_reqs[i].aio_fildes = fh->fd;
data->aio_reqs[i].aio_reqprio = 0;
data->aio_reqs[i].aio_sigevent.sigev_notify = SIGEV_NONE;
data->aio_req_status[i] = EINPROGRESS;
}
data->aio_first_active_req = 0;
if ( data->aio_req_count > data->aio_req_chunks ) {
data->aio_last_active_req = data->aio_req_chunks;
}
else {
data->aio_last_active_req = data->aio_req_count;
}
start_offset = data->aio_reqs[data->aio_first_active_req].aio_offset;
end_offset = data->aio_reqs[data->aio_last_active_req-1].aio_offset + data->aio_reqs[data->aio_last_active_req-1].aio_nbytes;
total_length = (end_offset - start_offset);
ret = mca_fbtl_posix_lock( &data->aio_lock, data->aio_fh, F_RDLCK, start_offset, total_length,
OMPIO_LOCK_ENTIRE_REGION, &data->aio_lock_counter );
if ( 0 < ret ) {
opal_output(1, "mca_fbtl_posix_ipreadv: error in mca_fbtl_posix_lock() error ret=%d %s", ret, strerror(errno));
mca_fbtl_posix_unlock ( &data->aio_lock, data->aio_fh, &data->aio_lock_counter );
free(data->aio_reqs);
free(data->aio_req_status);
free(data);
return OMPI_ERROR;
}
for (i=0; i < data->aio_last_active_req; i++) {
int counter=0;
while ( MAX_ATTEMPTS > counter ) {
if ( -1 != aio_read(&data->aio_reqs[i]) ) {
break;
}
counter++;
mca_common_ompio_progress();
}
if ( MAX_ATTEMPTS == counter ) {
opal_output(1, "mca_fbtl_posix_ipreadv: error in aio_read(): errno %d %s", errno, strerror(errno));
mca_fbtl_posix_unlock ( &data->aio_lock, data->aio_fh, &data->aio_lock_counter );
free(data->aio_reqs);
free(data->aio_req_status);
free(data);
return OMPI_ERROR;
}
}
req->req_data = data;
req->req_progress_fn = mca_fbtl_posix_progress;
req->req_free_fn = mca_fbtl_posix_request_free;
#endif
return OMPI_SUCCESS;
}
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