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netcdf-c/libhdf5/hdf5create.c
Dave Allured 69b2d20d56
Improve comments about format compatibility
2022-01-11 10:25:13 -07:00

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/* Copyright 2003-2022, University Corporation for Atmospheric
* Research. See COPYRIGHT file for copying and redistribution
* conditions. */
/**
* @file
* @internal The netCDF-4 file functions relating to file creation.
*
* @author Ed Hartnett
*/
#include "config.h"
#include "netcdf.h"
#include "ncpathmgr.h"
#include "ncpathmgr.h"
#include "hdf5internal.h"
/* From hdf5file.c. */
extern size_t nc4_chunk_cache_size;
extern size_t nc4_chunk_cache_nelems;
extern float nc4_chunk_cache_preemption;
/** @internal These flags may not be set for create. */
static const int ILLEGAL_CREATE_FLAGS = (NC_NOWRITE|NC_MMAP|NC_64BIT_OFFSET|NC_CDF5);
/* From nc4mem.c */
extern int NC4_create_image_file(NC_FILE_INFO_T* h5, size_t);
/**
* @internal Create a netCDF-4/HDF5 file.
*
* @param path The file name of the new file.
* @param cmode The creation mode flag.
* @param initialsz The proposed initial file size (advisory, for
* in-memory netCDF-4/HDF5 files only).
* @param parameters extra parameter info (like MPI communicator).
* @param ncid The already-assigned ncid for this file (aka ext_ncid).
*
* @return ::NC_NOERR No error.
* @return ::NC_EINVAL Invalid input (check cmode).
* @return ::NC_EEXIST File exists and NC_NOCLOBBER used.
* @return ::NC_EHDFERR HDF5 returned error.
* @ingroup netcdf4
* @author Ed Hartnett, Dennis Heimbigner
*/
static int
nc4_create_file(const char *path, int cmode, size_t initialsz,
void* parameters, int ncid)
{
hid_t fcpl_id, fapl_id = -1;
unsigned flags;
FILE *fp;
int retval = NC_NOERR;
NC_FILE_INFO_T *nc4_info;
NC_HDF5_FILE_INFO_T *hdf5_info;
NC_HDF5_GRP_INFO_T *hdf5_grp;
#ifdef USE_PARALLEL4
NC_MPI_INFO *mpiinfo = NULL;
MPI_Comm comm;
MPI_Info info;
int comm_duped = 0; /* Whether the MPI Communicator was duplicated */
int info_duped = 0; /* Whether the MPI Info object was duplicated */
#endif /* !USE_PARALLEL4 */
assert(path);
LOG((3, "%s: path %s mode 0x%x", __func__, path, cmode));
/* Add necessary structs to hold netcdf-4 file data. */
if ((retval = nc4_file_list_add(ncid, path, NC_WRITE | cmode,
(void **)&nc4_info)))
BAIL(retval);
assert(nc4_info && nc4_info->root_grp);
nc4_info->root_grp->atts_read = 1;
/* Add struct to hold HDF5-specific file metadata. */
if (!(nc4_info->format_file_info = calloc(1, sizeof(NC_HDF5_FILE_INFO_T))))
BAIL(NC_ENOMEM);
hdf5_info = (NC_HDF5_FILE_INFO_T *)nc4_info->format_file_info;
/* Add struct to hold HDF5-specific group info. */
if (!(nc4_info->root_grp->format_grp_info = calloc(1, sizeof(NC_HDF5_GRP_INFO_T))))
return NC_ENOMEM;
hdf5_grp = (NC_HDF5_GRP_INFO_T *)nc4_info->root_grp->format_grp_info;
nc4_info->mem.inmemory = (cmode & NC_INMEMORY) == NC_INMEMORY;
nc4_info->mem.diskless = (cmode & NC_DISKLESS) == NC_DISKLESS;
nc4_info->mem.persist = (cmode & NC_PERSIST) == NC_PERSIST;
nc4_info->mem.created = 1;
nc4_info->mem.initialsize = initialsz;
/* diskless => !inmemory */
if(nc4_info->mem.inmemory && nc4_info->mem.diskless)
BAIL(NC_EINTERNAL);
if(nc4_info->mem.inmemory && parameters)
nc4_info->mem.memio = *(NC_memio*)parameters;
#ifdef USE_PARALLEL4
else if(parameters) {
mpiinfo = (NC_MPI_INFO *)parameters;
comm = mpiinfo->comm;
info = mpiinfo->info;
}
#endif
if(nc4_info->mem.diskless)
flags = H5F_ACC_TRUNC;
else if(cmode & NC_NOCLOBBER)
flags = H5F_ACC_EXCL;
else
flags = H5F_ACC_TRUNC;
/* If this file already exists, and NC_NOCLOBBER is specified,
return an error (unless diskless|inmemory) */
if (!nc4_info->mem.diskless && !nc4_info->mem.inmemory) {
if ((cmode & NC_NOCLOBBER) && (fp = NCfopen(path, "r"))) {
fclose(fp);
BAIL(NC_EEXIST);
}
}
/* Need this FILE ACCESS plist to control how HDF5 handles open
* objects on file close; as well as for other controls below.
* (Setting H5F_CLOSE_WEAK will cause H5Fclose not to fail if there
* are any open objects in the file. This may happen when virtual
* datasets are opened). */
if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
BAIL(NC_EHDFERR);
if (H5Pset_fclose_degree(fapl_id, H5F_CLOSE_WEAK))
BAIL(NC_EHDFERR);
#ifdef USE_PARALLEL4
/* If this is a parallel file create, set up the file access
property list for MPI/IO. */
if (mpiinfo != NULL) {
nc4_info->parallel = NC_TRUE;
LOG((4, "creating parallel file with MPI/IO"));
if (H5Pset_fapl_mpio(fapl_id, comm, info) < 0)
BAIL(NC_EPARINIT);
/* Keep copies of the MPI Comm & Info objects */
if (MPI_SUCCESS != MPI_Comm_dup(comm, &nc4_info->comm))
BAIL(NC_EMPI);
comm_duped++;
if (MPI_INFO_NULL != info)
{
if (MPI_SUCCESS != MPI_Info_dup(info, &nc4_info->info))
BAIL(NC_EMPI);
info_duped++;
}
else
{
/* No dup, just copy it. */
nc4_info->info = info;
}
}
#endif /* USE_PARALLEL4 */
/* Only set cache for non-parallel creates. */
if (!nc4_info->parallel)
{
if (H5Pset_cache(fapl_id, 0, nc4_chunk_cache_nelems, nc4_chunk_cache_size,
nc4_chunk_cache_preemption) < 0)
BAIL(NC_EHDFERR);
LOG((4, "%s: set HDF raw chunk cache to size %d nelems %d preemption %f",
__func__, nc4_chunk_cache_size, nc4_chunk_cache_nelems,
nc4_chunk_cache_preemption));
}
/* Set HDF5 format compatibility in the FILE ACCESS property list.
* Compatibility is transient and must be reselected every time
* a file is opened for writing. */
retval = hdf5set_format_compatibility(fapl_id);
if (retval != NC_NOERR)
BAIL(retval);
/* Begin setup for the FILE CREATION property list. */
if ((fcpl_id = H5Pcreate(H5P_FILE_CREATE)) < 0)
BAIL(NC_EHDFERR);
/* RJ: this suppose to be FALSE that is defined in H5 private.h as 0 */
if (H5Pset_obj_track_times(fcpl_id,0)<0)
BAIL(NC_EHDFERR);
/* Set H5P_CRT_ORDER_TRACKED in the creation property list.
* This turns on HDF5 creation ordering. */
if (H5Pset_link_creation_order(fcpl_id, (H5P_CRT_ORDER_TRACKED |
H5P_CRT_ORDER_INDEXED)) < 0)
BAIL(NC_EHDFERR);
if (cmode & NC_NOATTCREORD) {
nc4_info->no_attr_create_order = NC_TRUE;
}
else {
if (H5Pset_attr_creation_order(fcpl_id, (H5P_CRT_ORDER_TRACKED |
H5P_CRT_ORDER_INDEXED)) < 0)
BAIL(NC_EHDFERR);
}
#ifdef HDF5_HAS_COLL_METADATA_OPS
/* If HDF5 supports collective metadata operations, turn them
* on. This is only relevant for parallel I/O builds of HDF5. */
if (H5Pset_all_coll_metadata_ops(fapl_id, 1) < 0)
BAIL(NC_EHDFERR);
if (H5Pset_coll_metadata_write(fapl_id, 1) < 0)
BAIL(NC_EHDFERR);
#endif
if(nc4_info->mem.inmemory) {
retval = NC4_create_image_file(nc4_info,initialsz);
if(retval)
BAIL(retval);
}
else
if(nc4_info->mem.diskless) {
size_t alloc_incr; /* Buffer allocation increment */
size_t min_incr = 65536; /* Minimum buffer increment */
double buf_prcnt = 0.1f; /* Percentage of buffer size to set as increment */
/* set allocation increment to a percentage of the supplied buffer size, or
* a pre-defined minimum increment value, whichever is larger
*/
if ((buf_prcnt * initialsz) > min_incr)
alloc_incr = (size_t)(buf_prcnt * initialsz);
else
alloc_incr = min_incr;
/* Configure FAPL to use the core file driver */
if (H5Pset_fapl_core(fapl_id, alloc_incr, (nc4_info->mem.persist?1:0)) < 0)
BAIL(NC_EHDFERR);
if ((hdf5_info->hdfid = nc4_H5Fcreate(path, flags, fcpl_id, fapl_id)) < 0)
BAIL(EACCES);
}
else /* Normal file */
{
/* Create the HDF5 file. */
if ((hdf5_info->hdfid = nc4_H5Fcreate(path, flags, fcpl_id, fapl_id)) < 0)
BAIL(EACCES);
}
/* Open the root group. */
if ((hdf5_grp->hdf_grpid = H5Gopen2(hdf5_info->hdfid, "/", H5P_DEFAULT)) < 0)
BAIL(NC_EFILEMETA);
/* Release the property lists. */
if (H5Pclose(fapl_id) < 0 || H5Pclose(fcpl_id) < 0)
BAIL(NC_EHDFERR);
/* Define mode gets turned on automatically on create. */
nc4_info->flags |= NC_INDEF;
/* Save the HDF5 superblock number and set the _NCProperties attribute. */
if ((retval = NC4_new_provenance(nc4_info)))
BAIL(retval);
return NC_NOERR;
exit: /*failure exit*/
#ifdef USE_PARALLEL4
if (comm_duped) MPI_Comm_free(&nc4_info->comm);
if (info_duped) MPI_Info_free(&nc4_info->info);
#endif
if (fapl_id != H5P_DEFAULT) H5Pclose(fapl_id);
if(!nc4_info) return retval;
nc4_close_hdf5_file(nc4_info, 1, NULL); /* treat like abort */
return retval;
}
/**
* @internal Create a netCDF-4/HDF5 file.
*
* @param path The file name of the new file.
* @param cmode The creation mode flag.
* @param initialsz Ignored by this function.
* @param basepe Ignored by this function.
* @param chunksizehintp Ignored by this function.
* @param parameters pointer to struct holding extra data (e.g. for
* parallel I/O) layer. Ignored if NULL.
* @param dispatch Pointer to the dispatch table for this file.
* @param ncid The ncid that has been assigned by the dispatch layer
* (aka ext_ncid).
*
* @return ::NC_NOERR No error.
* @return ::NC_EINVAL Invalid input (check cmode).
* @ingroup netcdf4
* @author Ed Hartnett
*/
int
NC4_create(const char* path, int cmode, size_t initialsz, int basepe,
size_t *chunksizehintp, void *parameters,
const NC_Dispatch *dispatch, int ncid)
{
int res;
assert(path);
LOG((1, "%s: path %s cmode 0x%x parameters %p",
__func__, path, cmode, parameters));
/* If this is our first file, turn off HDF5 error messages. */
if (!nc4_hdf5_initialized)
nc4_hdf5_initialize();
#ifdef LOGGING
/* If nc logging level has changed, see if we need to turn on
* HDF5's error messages. */
hdf5_set_log_level();
#endif /* LOGGING */
/* Check the cmode for validity. Checking parallel against
* NC_DISKLESS already done in NC_create(). */
if (cmode & ILLEGAL_CREATE_FLAGS)
return NC_EINVAL;
/* Create the netCDF-4/HDF5 file. */
res = nc4_create_file(path, cmode, initialsz, parameters, ncid);
return res;
}
/**
* Wrapper function for H5Fcreate.
* Converts the filename from ANSI to UTF-8 as needed before calling H5Fcreate.
*
* @param filename The filename encoded ANSI to access.
* @param flags File access flags.
* @param fcpl_id File creation property list identifier.
* @param fapl_id File access property list identifier.
* @return A file identifier if succeeded. A negative value if failed.
*/
hid_t
nc4_H5Fcreate(const char *filename0, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
{
hid_t hid;
char* localname = NULL;
char* filename = NULL;
#ifdef HDF5_UTF8_PATHS
NCpath2utf8(filename0,&filename);
#else
filename = strdup(filename0);
#endif
/* Canonicalize it since we are not opening the file ourselves */
if((localname = NCpathcvt(filename))==NULL)
{hid = H5I_INVALID_HID; goto done;}
hid = H5Fcreate(localname, flags, fcpl_id, fapl_id);
done:
nullfree(filename);
nullfree(localname);
return hid;
}
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