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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) 2004-2017 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) 2008-2018 University of Houston. All rights reserved.
* Copyright (c) 2015-2018 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2016-2017 IBM Corporation. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "fs_ufs.h"
#include <fcntl.h>
#include <sys/stat.h>
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/mca/fs/base/base.h"
#include "ompi/mca/fs/fs.h"
#include "ompi/communicator/communicator.h"
#include "ompi/info/info.h"
#include "opal/util/path.h"
/*
* file_open_ufs
*
* Function: - opens a new file
* Accepts: - same arguments as MPI_File_open()
* Returns: - Success if new file handle
*/
int
mca_fs_ufs_file_open (struct ompi_communicator_t *comm,
const char* filename,
int access_mode,
struct opal_info_t *info,
ompio_file_t *fh)
{
int amode, perm;
int ret=OMPI_SUCCESS;
perm = mca_fs_base_get_file_perm(fh);
amode = mca_fs_base_get_file_amode(fh->f_rank, access_mode);
/* Reset errno */
errno = 0;
if (OMPIO_ROOT == fh->f_rank) {
fh->fd = open (filename, amode, perm);
if ( 0 > fh->fd ) {
ret = mca_fs_base_get_mpi_err(errno);
}
}
comm->c_coll->coll_bcast ( &ret, 1, MPI_INT, 0, comm, comm->c_coll->coll_bcast_module);
if ( OMPI_SUCCESS != ret ) {
fh->fd = -1;
return ret;
}
if (OMPIO_ROOT != fh->f_rank) {
fh->fd = open (filename, amode, perm);
if ( 0 > fh->fd) {
return mca_fs_base_get_mpi_err(errno);
}
}
fh->f_stripe_size=0;
fh->f_stripe_count=1;
/* Need to check for NFS here. If the file system is not NFS but a regular UFS file system,
we do not need to enforce locking. A regular XFS or EXT4 file system can only be used
within a single node, local environment, and in this case the OS will already ensure correct
handling of file system blocks;
*/
if ( FS_UFS_LOCK_AUTO == mca_fs_ufs_lock_algorithm ) {
char *fstype=NULL;
bool bret = opal_path_nfs ( (char *)filename, &fstype );
if ( false == bret ) {
char *dir;
mca_fs_base_get_parent_dir ( (char *)filename, &dir );
bret = opal_path_nfs (dir, &fstype);
free(dir);
}
if ( true == bret ) {
if ( 0 == strncasecmp(fstype, "nfs", sizeof("nfs")) ) {
/* Based on my tests, only locking the entire file for all operations
guarantueed for the entire teststuite to pass correctly. I would not
be surprised, if depending on the NFS configuration that might not always
be necessary, and the user can change that with an MCA parameter of this
component. */
fh->f_flags |= OMPIO_LOCK_ENTIRE_FILE;
}
else {
fh->f_flags |= OMPIO_LOCK_NEVER;
}
}
else {
fh->f_flags |= OMPIO_LOCK_NEVER;
}
free (fstype);
}
else if ( FS_UFS_LOCK_NEVER == mca_fs_ufs_lock_algorithm ) {
fh->f_flags |= OMPIO_LOCK_NEVER;
}
else if ( FS_UFS_LOCK_ENTIRE_FILE == mca_fs_ufs_lock_algorithm ) {
fh->f_flags |= OMPIO_LOCK_ENTIRE_FILE;
}
else if ( FS_UFS_LOCK_RANGES == mca_fs_ufs_lock_algorithm ) {
/* Nothing to be done. This is what the posix fbtl component would do
anyway without additional information . */
}
else {
opal_output ( 1, "Invalid value for mca_fs_ufs_lock_algorithm %d", mca_fs_ufs_lock_algorithm );
}
return OMPI_SUCCESS;
}
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