1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifndef H5FDpublic_H
#define H5FDpublic_H
#include "H5public.h" /* Generic Functions */
#include "H5Fpublic.h" /* Files */
#include "H5Ipublic.h" /* Identifiers */
/*****************/
/* Public Macros */
/*****************/
#define H5FD_VFD_DEFAULT 0 /* Default VFL driver value */
/* VFD identifier values
* These are H5FD_class_value_t values, NOT hid_t values!
*/
#define H5_VFD_INVALID ((H5FD_class_value_t)(-1))
#define H5_VFD_SEC2 ((H5FD_class_value_t)(0))
#define H5_VFD_CORE ((H5FD_class_value_t)(1))
#define H5_VFD_LOG ((H5FD_class_value_t)(2))
#define H5_VFD_FAMILY ((H5FD_class_value_t)(3))
#define H5_VFD_MULTI ((H5FD_class_value_t)(4))
#define H5_VFD_STDIO ((H5FD_class_value_t)(5))
#define H5_VFD_SPLITTER ((H5FD_class_value_t)(6))
#define H5_VFD_MPIO ((H5FD_class_value_t)(7))
#define H5_VFD_DIRECT ((H5FD_class_value_t)(8))
#define H5_VFD_MIRROR ((H5FD_class_value_t)(9))
#define H5_VFD_HDFS ((H5FD_class_value_t)(10))
#define H5_VFD_ROS3 ((H5FD_class_value_t)(11))
#define H5_VFD_SUBFILING ((H5FD_class_value_t)(12))
#define H5_VFD_IOC ((H5FD_class_value_t)(13))
#define H5_VFD_ONION ((H5FD_class_value_t)(14))
/* VFD IDs below this value are reserved for library use. */
#define H5_VFD_RESERVED 256
/* Maximum VFD ID */
#define H5_VFD_MAX 65535
/* Define VFL driver features that can be enabled on a per-driver basis */
/* These are returned with the 'query' function pointer in H5FD_class_t */
/*
* Defining H5FD_FEAT_AGGREGATE_METADATA for a VFL driver means that
* the library will attempt to allocate a larger block for metadata and
* then sub-allocate each metadata request from that larger block.
*/
#define H5FD_FEAT_AGGREGATE_METADATA 0x00000001
/*
* Defining H5FD_FEAT_ACCUMULATE_METADATA for a VFL driver means that
* the library will attempt to cache metadata as it is written to the file
* and build up a larger block of metadata to eventually pass to the VFL
* 'write' routine.
*
* Distinguish between updating the metadata accumulator on writes and
* reads. This is particularly (perhaps only, even) important for MPI-I/O
* where we guarantee that writes are collective, but reads may not be.
* If we were to allow the metadata accumulator to be written during a
* read operation, the application would hang.
*/
#define H5FD_FEAT_ACCUMULATE_METADATA_WRITE 0x00000002
#define H5FD_FEAT_ACCUMULATE_METADATA_READ 0x00000004
#define H5FD_FEAT_ACCUMULATE_METADATA \
(H5FD_FEAT_ACCUMULATE_METADATA_WRITE | H5FD_FEAT_ACCUMULATE_METADATA_READ)
/*
* Defining H5FD_FEAT_DATA_SIEVE for a VFL driver means that
* the library will attempt to cache raw data as it is read from/written to
* a file in a "data sieve" buffer. See Rajeev Thakur's papers:
* http://www.mcs.anl.gov/~thakur/papers/romio-coll.ps.gz
* http://www.mcs.anl.gov/~thakur/papers/mpio-high-perf.ps.gz
*/
#define H5FD_FEAT_DATA_SIEVE 0x00000008
/*
* Defining H5FD_FEAT_AGGREGATE_SMALLDATA for a VFL driver means that
* the library will attempt to allocate a larger block for "small" raw data
* and then sub-allocate "small" raw data requests from that larger block.
*/
#define H5FD_FEAT_AGGREGATE_SMALLDATA 0x00000010
/*
* Defining H5FD_FEAT_IGNORE_DRVRINFO for a VFL driver means that
* the library will ignore the driver info that is encoded in the file
* for the VFL driver. (This will cause the driver info to be eliminated
* from the file when it is flushed/closed, if the file is opened R/W).
*/
#define H5FD_FEAT_IGNORE_DRVRINFO 0x00000020
/*
* Defining the H5FD_FEAT_DIRTY_DRVRINFO_LOAD for a VFL driver means that
* the library will mark the driver info dirty when the file is opened
* R/W. This will cause the driver info to be re-encoded when the file
* is flushed/closed.
*/
#define H5FD_FEAT_DIRTY_DRVRINFO_LOAD 0x00000040
/*
* Defining H5FD_FEAT_POSIX_COMPAT_HANDLE for a VFL driver means that
* the handle for the VFD (returned with the 'get_handle' callback) is
* of type 'int' and is compatible with POSIX I/O calls.
*/
#define H5FD_FEAT_POSIX_COMPAT_HANDLE 0x00000080
/*
* Defining H5FD_FEAT_HAS_MPI for a VFL driver means that
* the driver makes use of MPI communication and code may retrieve
* communicator/rank information from it
*/
#define H5FD_FEAT_HAS_MPI 0x00000100
/*
* Defining the H5FD_FEAT_ALLOCATE_EARLY for a VFL driver will force
* the library to use the H5D_ALLOC_TIME_EARLY on dataset create
* instead of the default H5D_ALLOC_TIME_LATE
*/
#define H5FD_FEAT_ALLOCATE_EARLY 0x00000200
/*
* Defining H5FD_FEAT_ALLOW_FILE_IMAGE for a VFL driver means that
* the driver is able to use a file image in the fapl as the initial
* contents of a file.
*/
#define H5FD_FEAT_ALLOW_FILE_IMAGE 0x00000400
/*
* Defining H5FD_FEAT_CAN_USE_FILE_IMAGE_CALLBACKS for a VFL driver
* means that the driver is able to use callbacks to make a copy of the
* image to store in memory.
*/
#define H5FD_FEAT_CAN_USE_FILE_IMAGE_CALLBACKS 0x00000800
/*
* Defining H5FD_FEAT_SUPPORTS_SWMR_IO for a VFL driver means that the
* driver supports the single-writer/multiple-readers I/O pattern.
*/
#define H5FD_FEAT_SUPPORTS_SWMR_IO 0x00001000
/*
* Defining H5FD_FEAT_USE_ALLOC_SIZE for a VFL driver
* means that the library will just pass the allocation size to the
* the driver's allocation callback which will eventually handle alignment.
* This is specifically used for the multi/split driver.
*/
#define H5FD_FEAT_USE_ALLOC_SIZE 0x00002000
/*
* Defining H5FD_FEAT_PAGED_AGGR for a VFL driver
* means that the driver needs special file space mapping for paged aggregation.
* This is specifically used for the multi/split driver.
*/
#define H5FD_FEAT_PAGED_AGGR 0x00004000
/*
* Defining H5FD_FEAT_DEFAULT_VFD_COMPATIBLE for a VFL driver
* that creates a file which is compatible with the default VFD.
* Generally, this means that the VFD creates a single file that follows
* the canonical HDF5 file format.
* Regarding the Splitter VFD specifically, only drivers with this flag
* enabled may be used as the Write-Only (W/O) channel driver.
*/
#define H5FD_FEAT_DEFAULT_VFD_COMPATIBLE 0x00008000
/*
* Defining H5FD_FEAT_MEMMANAGE for a VFL driver means that
* the driver uses special memory management routines or wishes
* to do memory management in a specific manner. Therefore, HDF5
* should request that the driver handle any memory management
* operations when appropriate.
*/
#define H5FD_FEAT_MEMMANAGE 0x00010000
/* ctl function definitions: */
#define H5FD_CTL_OPC_RESERVED 512 /* Opcodes below this value are reserved for library use */
#define H5FD_CTL_OPC_EXPER_MIN \
H5FD_CTL_OPC_RESERVED /* Minimum opcode value available for experimental use \
*/
#define H5FD_CTL_OPC_EXPER_MAX \
(H5FD_CTL_OPC_RESERVED + 511) /* Maximum opcode value available for experimental use */
/* ctl function op codes: */
#define H5FD_CTL_INVALID_OPCODE 0
#define H5FD_CTL_TEST_OPCODE 1
#define H5FD_CTL_GET_MPI_COMMUNICATOR_OPCODE 2
#define H5FD_CTL_GET_MPI_RANK_OPCODE 3
#define H5FD_CTL_GET_MPI_SIZE_OPCODE 4
#define H5FD_CTL_MEM_ALLOC 5
#define H5FD_CTL_MEM_FREE 6
#define H5FD_CTL_MEM_COPY 7
#define H5FD_CTL_GET_MPI_FILE_SYNC_OPCODE 8
/* ctl function flags: */
/* Definitions:
*
* WARNING: While the following definitions of Terminal
* and Passthrough VFDs should be workable for now, they
* have to be adjusted as our use cases for VFDs expand.
*
* JRM -- 8/4/21
*
*
* Terminal VFD: Lowest VFD in the VFD stack through
* which all VFD calls pass. Note that this definition
* is situational. For example, the sec2 VFD is typically
* terminal. However, in the context of the family file
* driver, it is not -- the family file driver is the
* bottom VFD through which all VFD calls pass, and thus
* it is terminal.
*
* Similarly, on the splitter VFD, a sec2 VFD on the
* R/W channel is terminal, but a sec2 VFD on the W/O
* channel is not.
*
*
* Pass through VFD: Any VFD that relays all VFD calls
* (with the possible exception of some non-I/O related
* calls) to underlying VFD(s).
*/
/* Unknown op codes should be ignored silently unless the
* H5FD_CTL_FAIL_IF_UNKNOWN_FLAG is set.
*
* On terminal VFDs, unknown op codes should generate an
* error unconditionally if this flag is set.
*
* On pass through VFDs, unknown op codes should be routed
* to the underlying VFD(s) as indicated by any routing
* flags. In the absence of such flags, the VFD should
* generate an error.
*/
#define H5FD_CTL_FAIL_IF_UNKNOWN_FLAG 0x0001
/* The H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG is used only
* by non-ternminal VFDs, and only applies to unknown
* opcodes. (known op codes should be handled as
* appropriate.)
*
* If this flag is set for an unknown op code, that
* op code should be passed to the next VFD down
* the VFD stack en-route to the terminal VFD.
* If that VFD does not support the ctl call, the
* pass through VFD should fail or succeed as directed
* by the H5FD_CTL_FAIL_IF_UNKNOWN_FLAG.
*/
#define H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG 0x0002
/*******************/
/* Public Typedefs */
/*******************/
/*
* File driver identifiers.
*
* Values 0 through 255 are for drivers defined by the HDF5 library.
* Values 256 through 511 are available for testing new drivers.
* Subsequent values should be obtained from the HDF5 development
* team at mailto:help@hdfgroup.org.
*/
typedef int H5FD_class_value_t;
/* Types of allocation requests: see H5Fpublic.h */
typedef enum H5F_mem_t H5FD_mem_t;
/**
* Define enum for the source of file image callbacks
*/
//! <!-- [H5FD_file_image_op_t_snip] -->
typedef enum {
H5FD_FILE_IMAGE_OP_NO_OP,
H5FD_FILE_IMAGE_OP_PROPERTY_LIST_SET,
/**< Passed to the \p image_malloc and \p image_memcpy callbacks when a
* file image buffer is to be copied while being set in a file access
* property list (FAPL)*/
H5FD_FILE_IMAGE_OP_PROPERTY_LIST_COPY,
/**< Passed to the \p image_malloc and \p image_memcpy callbacks
* when a file image buffer is to be copied when a FAPL is copied*/
H5FD_FILE_IMAGE_OP_PROPERTY_LIST_GET,
/**<Passed to the \p image_malloc and \p image_memcpy callbacks when
* a file image buffer is to be copied while being retrieved from a FAPL*/
H5FD_FILE_IMAGE_OP_PROPERTY_LIST_CLOSE,
/**<Passed to the \p image_free callback when a file image
* buffer is to be released during a FAPL close operation*/
H5FD_FILE_IMAGE_OP_FILE_OPEN,
/**<Passed to the \p image_malloc and
* \p image_memcpy callbackswhen a
* file image buffer is to be copied during a file open operation \n
* While the file image being opened will typically be copied from a
* FAPL, this need not always be the case. For example, the core file
* driver, also known as the memory file driver, takes its initial
* image from a file.*/
H5FD_FILE_IMAGE_OP_FILE_RESIZE,
/**<Passed to the \p image_realloc callback when a file driver needs
* to resize an image buffer*/
H5FD_FILE_IMAGE_OP_FILE_CLOSE
/**<Passed to the \p image_free callback when an image buffer is to
* be released during a file close operation*/
} H5FD_file_image_op_t;
//! <!-- [H5FD_file_image_op_t_snip] -->
/**
* Define structure to hold file image callbacks
*/
//! <!-- [H5FD_file_image_callbacks_t_snip] -->
typedef struct {
/**
* \param[in] size Size in bytes of the file image buffer to allocate
* \param[in] file_image_op A value from H5FD_file_image_op_t indicating
* the operation being performed on the file image
* when this callback is invoked
* \param[in] udata Value passed in in the H5Pset_file_image_callbacks
* parameter \p udata
*/
//! <!-- [image_malloc_snip] -->
void *(*image_malloc)(size_t size, H5FD_file_image_op_t file_image_op, void *udata);
//! <!-- [image_malloc_snip] -->
/**
* \param[in] dest Address of the destination buffer
* \param[in] src Address of the source buffer
* \param[in] size Size in bytes of the file image buffer to allocate
* \param[in] file_image_op A value from #H5FD_file_image_op_t indicating
* the operation being performed on the file image
* when this callback is invoked
* \param[in] udata Value passed in in the H5Pset_file_image_callbacks
* parameter \p udata
*/
//! <!-- [image_memcpy_snip] -->
void *(*image_memcpy)(void *dest, const void *src, size_t size, H5FD_file_image_op_t file_image_op,
void *udata);
//! <!-- [image_memcpy_snip] -->
/**
* \param[in] ptr Pointer to the buffer being reallocated
* \param[in] size Size in bytes of the file image buffer to allocate
* \param[in] file_image_op A value from #H5FD_file_image_op_t indicating
* the operation being performed on the file image
* when this callback is invoked
* \param[in] udata Value passed in in the H5Pset_file_image_callbacks
* parameter \p udata
*/
//! <!-- [image_realloc_snip] -->
void *(*image_realloc)(void *ptr, size_t size, H5FD_file_image_op_t file_image_op, void *udata);
//! <!-- [image_realloc_snip] -->
/**
* \param[in] ptr Pointer to the buffer being reallocated
* \param[in] file_image_op A value from #H5FD_file_image_op_t indicating
* the operation being performed on the file image
* when this callback is invoked
* \param[in] udata Value passed in in the H5Pset_file_image_callbacks
* parameter \p udata
*/
//! <!-- [image_free_snip] -->
herr_t (*image_free)(void *ptr, H5FD_file_image_op_t file_image_op, void *udata);
//! <!-- [image_free_snip] -->
/**
* \param[in] udata Value passed in in the H5Pset_file_image_callbacks
* parameter \p udata
*/
//! <!-- [udata_copy_snip] -->
void *(*udata_copy)(void *udata);
//! <!-- [udata_copy_snip] -->
/**
* \param[in] udata Value passed in in the H5Pset_file_image_callbacks
* parameter \p udata
*/
//! <!-- [udata_free_snip] -->
herr_t (*udata_free)(void *udata);
//! <!-- [udata_free_snip] -->
/**
* \brief The final field in the #H5FD_file_image_callbacks_t struct,
* provides a pointer to user-defined data. This pointer will be
* passed to the image_malloc, image_memcpy, image_realloc, and
* image_free callbacks. Define udata as NULL if no user-defined
* data is provided.
*/
void *udata;
} H5FD_file_image_callbacks_t;
//! <!-- [H5FD_file_image_callbacks_t_snip] -->
/**
* Define structure to hold "ctl memory copy" parameters
*/
//! <!-- [H5FD_ctl_memcpy_args_t_snip] -->
typedef struct H5FD_ctl_memcpy_args_t {
void *dstbuf; /**< Destination buffer */
hsize_t dst_off; /**< Offset within destination buffer */
const void *srcbuf; /**< Source buffer */
hsize_t src_off; /**< Offset within source buffer */
size_t len; /**< Length of data to copy from source buffer */
} H5FD_ctl_memcpy_args_t;
//! <!-- [H5FD_ctl_memcpy_args_t_snip] -->
/********************/
/* Public Variables */
/********************/
/*********************/
/* Public Prototypes */
/*********************/
#ifdef __cplusplus
extern "C" {
#endif
/* Function prototypes */
/**
* \ingroup H5FD
*
* \brief Allows querying a VFD ID for features before the file is opened
*
* \param[in] driver_id Virtual File Driver (VFD) ID
* \param[out] flags VFD flags supported
*
* \return \herr_t
*
* \details Queries a virtual file driver (VFD) for feature flags. Takes a
* VFD hid_t so it can be used before the file is opened. For example,
* this could be used to check if a VFD supports SWMR.
*
* \note The flags obtained here are just those of the base driver and
* do not take any configuration options (e.g., set via a fapl
* call) into consideration.
*
* \since 1.10.2
*/
H5_DLL herr_t H5FDdriver_query(hid_t driver_id, unsigned long *flags /*out*/);
#ifdef __cplusplus
}
#endif
#endif
|