summaryrefslogtreecommitdiffstats
path: root/src/H5HGcache.c
blob: a4c55bbe3a603c8c3e10617180340c2f33150602 (plain)
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
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * 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.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:		H5HGcache.c
 *			Feb  5 2008
 *			Quincey Koziol
 *
 * Purpose:		Implement global heap metadata cache methods.
 *
 *-------------------------------------------------------------------------
 */

/****************/
/* Module Setup */
/****************/

#include "H5HGmodule.h" /* This source code file is part of the H5HG module */

/***********/
/* Headers */
/***********/
#include "H5private.h"   /* Generic Functions			*/
#include "H5Eprivate.h"  /* Error handling		  	*/
#include "H5Fprivate.h"  /* File access				*/
#include "H5HGpkg.h"     /* Global heaps				*/
#include "H5MFprivate.h" /* File memory management		*/
#include "H5MMprivate.h" /* Memory management			*/

/****************/
/* Local Macros */
/****************/

/******************/
/* Local Typedefs */
/******************/

/********************/
/* Package Typedefs */
/********************/

/********************/
/* Local Prototypes */
/********************/

/* Metadata cache callbacks */
static herr_t H5HG__cache_heap_get_initial_load_size(void *udata, size_t *image_len);
static herr_t H5HG__cache_heap_get_final_load_size(const void *_image, size_t image_len, void *udata,
                                                   size_t *actual_len);
static void * H5HG__cache_heap_deserialize(const void *image, size_t len, void *udata, hbool_t *dirty);
static herr_t H5HG__cache_heap_image_len(const void *thing, size_t *image_len);
static herr_t H5HG__cache_heap_serialize(const H5F_t *f, void *image, size_t len, void *thing);
static herr_t H5HG__cache_heap_free_icr(void *thing);

/* Prefix deserialization */
static herr_t H5HG__hdr_deserialize(H5HG_heap_t *heap, const uint8_t *image, const H5F_t *f);

/*********************/
/* Package Variables */
/*********************/

/* H5HG inherits cache-like properties from H5AC */
const H5AC_class_t H5AC_GHEAP[1] = {{
    H5AC_GHEAP_ID,                          /* Metadata client ID */
    "global heap",                          /* Metadata client name (for debugging) */
    H5FD_MEM_GHEAP,                         /* File space memory type for client */
    H5AC__CLASS_SPECULATIVE_LOAD_FLAG,      /* Client class behavior flags */
    H5HG__cache_heap_get_initial_load_size, /* 'get_initial_load_size' callback */
    H5HG__cache_heap_get_final_load_size,   /* 'get_final_load_size' callback */
    NULL,                                   /* 'verify_chksum' callback */
    H5HG__cache_heap_deserialize,           /* 'deserialize' callback */
    H5HG__cache_heap_image_len,             /* 'image_len' callback */
    NULL,                                   /* 'pre_serialize' callback */
    H5HG__cache_heap_serialize,             /* 'serialize' callback */
    NULL,                                   /* 'notify' callback */
    H5HG__cache_heap_free_icr,              /* 'free_icr' callback */
    NULL,                                   /* 'fsf_size' callback */
    NULL,                                   /* VFD SWMR 'refresh' callback */
}};

/*****************************/
/* Library Private Variables */
/*****************************/

/*******************/
/* Local Variables */
/*******************/

/*-------------------------------------------------------------------------
 * Function:    H5HG__hdr_deserialize()
 *
 * Purpose:	Decode a global heap's header
 *
 * Return:      Success:        SUCCEED
 *              Failure:        FAIL
 *
 * Programmer:  Quincey Koziol
 *              December 15, 2016
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HG__hdr_deserialize(H5HG_heap_t *heap, const uint8_t *image, const H5F_t *f)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity check */
    HDassert(heap);
    HDassert(image);
    HDassert(f);

    /* Magic number */
    if (HDmemcmp(image, H5HG_MAGIC, (size_t)H5_SIZEOF_MAGIC) != 0)
        HGOTO_ERROR(H5E_HEAP, H5E_BADVALUE, FAIL, "bad global heap collection signature")
    image += H5_SIZEOF_MAGIC;

    /* Version */
    if (H5HG_VERSION != *image++)
        HGOTO_ERROR(H5E_HEAP, H5E_VERSION, FAIL, "wrong version number in global heap")

    /* Reserved */
    image += 3;

    /* Size */
    H5F_DECODE_LENGTH(f, image, heap->size);
    HDassert(heap->size >= H5HG_MINSIZE);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HG__hdr_deserialize() */

/*-------------------------------------------------------------------------
 * Function:    H5HG__cache_heap_get_initial_load_size()
 *
 * Purpose:	Return the initial speculative read size to the metadata
 *		cache.  This size will be used in the initial attempt to read
 *		the global heap.  If this read is too small, the cache will
 *		try again with the correct value obtained from
 *		H5HG__cache_get_final_load_size().
 *
 * Return:      Success:        SUCCEED
 *              Failure:        FAIL
 *
 * Programmer:  John Mainzer
 *              7/27/14
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HG__cache_heap_get_initial_load_size(void H5_ATTR_UNUSED *_udata, size_t *image_len)
{
    FUNC_ENTER_STATIC_NOERR

    /* Sanity check */
    HDassert(image_len);

    /* Set the image length size */
    *image_len = (size_t)H5HG_MINSIZE;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5HG__cache_heap_get_initial_load_size() */

/*-------------------------------------------------------------------------
 * Function:    H5HG__cache_heap_get_initial_load_size()
 *
 * Purpose:	Return the final read size for a speculatively ready heap to
 *		the metadata cache.
 *
 * Return:      Success:        SUCCEED
 *              Failure:        FAIL
 *
 * Programmer:  Quincey Koziol
 *              November 18, 2016
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HG__cache_heap_get_final_load_size(const void *image, size_t H5_ATTR_NDEBUG_UNUSED image_len, void *udata,
                                     size_t *actual_len)
{
    H5HG_heap_t heap;                /* Global heap */
    herr_t      ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity check */
    HDassert(image);
    HDassert(udata);
    HDassert(actual_len);
    HDassert(*actual_len == image_len);
    HDassert(image_len == H5HG_MINSIZE);

    /* Deserialize the heap's header */
    if (H5HG__hdr_deserialize(&heap, (const uint8_t *)image, (const H5F_t *)udata) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTDECODE, FAIL, "can't decode global heap prefix")

    /* Set the final size for the cache image */
    *actual_len = heap.size;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HG__cache_heap_get_final_load_size() */

/*-------------------------------------------------------------------------
 * Function:    H5HG__cache_heap_deserialize
 *
 * Purpose:	Given a buffer containing the on disk image of the global
 *		heap, deserialize it, load its contents into a newly allocated
 *		instance of H5HG_heap_t, and return a pointer to the new instance.
 *
 * Return:      Success:        Pointer to in core representation
 *              Failure:        NULL
 *
 * Programmer:  John Mainzer
 *              7/27/14
 *
 *-------------------------------------------------------------------------
 */
static void *
H5HG__cache_heap_deserialize(const void *_image, size_t len, void *_udata, hbool_t H5_ATTR_UNUSED *dirty)
{
    H5F_t *      f    = (H5F_t *)_udata; /* File pointer -- obtained from user data */
    H5HG_heap_t *heap = NULL;            /* New global heap */
    uint8_t *    image;                  /* Pointer to image to decode */
    size_t       max_idx = 0;            /* Maximum heap object index seen */
    size_t       nalloc;                 /* Number of objects allocated */
    void *       ret_value = NULL;       /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(_image);
    HDassert(len >= (size_t)H5HG_MINSIZE);
    HDassert(f);
    HDassert(dirty);

    /* Allocate a new global heap */
    if (NULL == (heap = H5FL_CALLOC(H5HG_heap_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
    heap->shared = H5F_SHARED(f);
    if (NULL == (heap->chunk = H5FL_BLK_MALLOC(gheap_chunk, len)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

    /* Copy the image buffer into the newly allocate chunk */
    H5MM_memcpy(heap->chunk, _image, len);

    /* Deserialize the heap's header */
    if (H5HG__hdr_deserialize(heap, (const uint8_t *)heap->chunk, f) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTDECODE, NULL, "can't decode global heap header")

    /* Decode each object */
    image  = heap->chunk + H5HG_SIZEOF_HDR(f);
    nalloc = H5HG_NOBJS(f, heap->size);

    /* Calloc the obj array because the file format spec makes no guarantee
     * about the order of the objects, and unused slots must be set to zero.
     */
    if (NULL == (heap->obj = H5FL_SEQ_CALLOC(H5HG_obj_t, nalloc)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
    heap->nalloc = nalloc;

    while (image < (heap->chunk + heap->size)) {
        if ((image + H5HG_SIZEOF_OBJHDR(f)) > (heap->chunk + heap->size)) {
            /*
             * The last bit of space is too tiny for an object header, so
             * we assume that it's free space.
             */
            HDassert(NULL == heap->obj[0].begin);
            heap->obj[0].size  = (size_t)(((const uint8_t *)heap->chunk + heap->size) - image);
            heap->obj[0].begin = image;
            image += heap->obj[0].size;
        } /* end if */
        else {
            size_t   need = 0;
            unsigned idx;
            uint8_t *begin = image;

            UINT16DECODE(image, idx);

            /* Check if we need more room to store heap objects */
            if (idx >= heap->nalloc) {
                size_t      new_alloc; /* New allocation number */
                H5HG_obj_t *new_obj;   /* New array of object   descriptions          */

                /* Determine the new number of objects to index */
                new_alloc = MAX(heap->nalloc * 2, (idx + 1));
                HDassert(idx < new_alloc);

                /* Reallocate array of objects */
                if (NULL == (new_obj = H5FL_SEQ_REALLOC(H5HG_obj_t, heap->obj, new_alloc)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

                /* Clear newly allocated space */
                HDmemset(&new_obj[heap->nalloc], 0, (new_alloc - heap->nalloc) * sizeof(heap->obj[0]));

                /* Update heap information */
                heap->nalloc = new_alloc;
                heap->obj    = new_obj;
                HDassert(heap->nalloc > heap->nused);
            } /* end if */

            UINT16DECODE(image, heap->obj[idx].nrefs);
            image += 4; /*reserved*/
            H5F_DECODE_LENGTH(f, image, heap->obj[idx].size);
            heap->obj[idx].begin = begin;

            /*
             * The total storage size includes the size of the object
             * header and is zero padded so the next object header is
             * properly aligned. The entire obj array was calloc'ed,
             * so no need to zero the space here. The last bit of space
             * is the free space object whose size is never padded and
             * already includes the object header.
             */
            if (idx > 0) {
                need = H5HG_SIZEOF_OBJHDR(f) + H5HG_ALIGN(heap->obj[idx].size);
                if (idx > max_idx)
                    max_idx = idx;
            } /* end if */
            else
                need = heap->obj[idx].size;

            image = begin + need;
        } /* end else */
    }     /* end while */

    /* Sanity checks */
    HDassert(image == heap->chunk + heap->size);
    HDassert(H5HG_ISALIGNED(heap->obj[0].size));

    /* Set the next index value to use */
    if (max_idx > 0)
        heap->nused = max_idx + 1;
    else
        heap->nused = 1;

    /* Sanity check */
    HDassert(max_idx < heap->nused);

    /* Add the new heap to the CWFS list for the file */
    if (H5F_cwfs_add(f, heap) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, NULL, "unable to add global heap collection to file's CWFS")

    ret_value = heap;

done:
    if (!ret_value && heap)
        if (H5HG__free(heap) < 0)
            HDONE_ERROR(H5E_HEAP, H5E_CANTFREE, NULL, "unable to destroy global heap collection")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HG__cache_heap_deserialize() */

/*-------------------------------------------------------------------------
 * Function:    H5HG__cache_heap_image_len
 *
 * Purpose:	Return the on disk image size of the global heap to the
 *		metadata cache via the image_len.
 *
 * Return:      Success:        SUCCEED
 *              Failure:        FAIL
 *
 * Programmer:  John Mainzer
 *              7/27/14
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HG__cache_heap_image_len(const void *_thing, size_t *image_len)
{
    const H5HG_heap_t *heap = (const H5HG_heap_t *)_thing;

    FUNC_ENTER_STATIC_NOERR

    /* Sanity checks */
    HDassert(heap);
    HDassert(heap->cache_info.magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
    HDassert(heap->cache_info.type == H5AC_GHEAP);
    HDassert(heap->size >= H5HG_MINSIZE);
    HDassert(image_len);

    *image_len = heap->size;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5HG__cache_heap_image_len() */

/*-------------------------------------------------------------------------
 * Function:    H5HG__cache_heap_serialize
 *
 * Purpose:	Given an appropriately sized buffer and an instance of
 *		H5HG_heap_t, serialize the global heap for writing to file,
 *		and copy the serialized version into the buffer.
 *
 *
 * Return:      Success:        SUCCEED
 *              Failure:        FAIL
 *
 * Programmer:  John Mainzer
 *              7/27/14
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HG__cache_heap_serialize(const H5F_t H5_ATTR_NDEBUG_UNUSED *f, void *image, size_t len, void *_thing)
{
    H5HG_heap_t *heap = (H5HG_heap_t *)_thing;

    FUNC_ENTER_STATIC_NOERR

    HDassert(f);
    HDassert(image);
    HDassert(heap);
    HDassert(heap->cache_info.magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
    HDassert(heap->cache_info.type == H5AC_GHEAP);
    HDassert(heap->size == len);
    HDassert(heap->chunk);

    /* copy the image into the buffer */
    H5MM_memcpy(image, heap->chunk, len);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5HG__cache_heap_serialize() */

/*-------------------------------------------------------------------------
 * Function:    H5HG__cache_heap_free_icr
 *
 * Purpose:	Free the in memory representation of the supplied global heap.
 *
 * Note:	The metadata cache sets the object's cache_info.magic to
 *		H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC before calling a free_icr
 *		callback (checked in assert).
 *
 * Return:      Success:        SUCCEED
 *              Failure:        FAIL
 *
 * Programmer:  John Mainzer
 *              7/27/14
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HG__cache_heap_free_icr(void *_thing)
{
    H5HG_heap_t *heap      = (H5HG_heap_t *)_thing;
    herr_t       ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(heap);
    HDassert(heap->cache_info.magic == H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC);
    HDassert(heap->cache_info.type == H5AC_GHEAP);

    /* Destroy global heap collection */
    if (H5HG__free(heap) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTFREE, FAIL, "unable to destroy global heap collection")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HG__cache_heap_free_icr() */