summaryrefslogtreecommitdiffstats
path: root/src/H5HFman.c
blob: d5075c0317f9b3f5c66b86230c0f6fd6bbf103d9 (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
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:		H5HFman.c
 *
 * Purpose:		"Managed" object routines for fractal heaps.
 *
 *-------------------------------------------------------------------------
 */

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

#include "H5HFmodule.h" /* This source code file is part of the H5HF module */

/***********/
/* Headers */
/***********/
#include "H5private.h"   /* Generic Functions			*/
#include "H5Eprivate.h"  /* Error handling		  	*/
#include "H5HFpkg.h"     /* Fractal heaps			*/
#include "H5MFprivate.h" /* File memory management		*/
#include "H5MMprivate.h" /* Memory management			*/
#include "H5VMprivate.h" /* Vectors and arrays 			*/

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

/* Macro to check if we can apply all filters in the pipeline.  Use whenever
 * performing a modification operation */
#define H5HF_MAN_WRITE_CHECK_PLINE(HDR)                                                                      \
    {                                                                                                        \
        if (!((HDR)->checked_filters)) {                                                                     \
            if ((HDR)->pline.nused)                                                                          \
                if (H5Z_can_apply_direct(&((HDR)->pline)) < 0)                                               \
                    HGOTO_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "I/O filters can't operate on this heap");     \
                                                                                                             \
            (HDR)->checked_filters = TRUE;                                                                   \
        } /* end if */                                                                                       \
    }

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

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

/********************/
/* Local Prototypes */
/********************/
static herr_t H5HF__man_op_real(H5HF_hdr_t *hdr, const uint8_t *id, H5HF_operator_t op, void *op_data,
                                unsigned op_flags);

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

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

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

/*-------------------------------------------------------------------------
 * Function:	H5HF__man_insert
 *
 * Purpose:	Insert an object in a managed direct block
 *
 * Return:	SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF__man_insert(H5HF_hdr_t *hdr, size_t obj_size, const void *obj, void *_id)
{
    H5HF_free_section_t *sec_node    = NULL;        /* Pointer to free space section */
    H5HF_direct_t       *dblock      = NULL;        /* Pointer to direct block to modify */
    haddr_t              dblock_addr = HADDR_UNDEF; /* Direct block address */
    size_t               dblock_size;               /* Direct block size */
    uint8_t             *id = (uint8_t *)_id;       /* Pointer to ID buffer */
    size_t               blk_off;                   /* Offset of object within block */
    htri_t               node_found;                /* Whether an existing free list node was found */
    herr_t               ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_PACKAGE

    /*
     * Check arguments.
     */
    assert(hdr);
    assert(obj_size > 0);
    assert(obj);
    assert(id);

    /* Check pipeline */
    H5HF_MAN_WRITE_CHECK_PLINE(hdr)

    /* Look for free space */
    if ((node_found = H5HF__space_find(hdr, (hsize_t)obj_size, &sec_node)) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTALLOC, FAIL, "can't locate free space in fractal heap");

    /* If we didn't find a node, go create a direct block big enough to hold the requested block */
    if (!node_found)
        /* Allocate direct block big enough to hold requested size */
        if (H5HF__man_dblock_new(hdr, obj_size, &sec_node) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTCREATE, FAIL, "can't create fractal heap direct block");

    /* Check for row section */
    if (sec_node->sect_info.type == H5HF_FSPACE_SECT_FIRST_ROW ||
        sec_node->sect_info.type == H5HF_FSPACE_SECT_NORMAL_ROW) {

        /* Allocate 'single' selection out of 'row' selection */
        if (H5HF__man_iblock_alloc_row(hdr, &sec_node) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTALLOC, FAIL, "can't break up row section");
    } /* end if */
    assert(sec_node->sect_info.type == H5HF_FSPACE_SECT_SINGLE);

    /* Check for 'single' section being serialized */
    if (sec_node->sect_info.state == H5FS_SECT_SERIALIZED)
        if (H5HF__sect_single_revive(hdr, sec_node) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't revive single free section");
    assert(sec_node->sect_info.state == H5FS_SECT_LIVE);

    /* Retrieve direct block address from section */
    if (H5HF__sect_single_dblock_info(hdr, sec_node, &dblock_addr, &dblock_size) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTGET, FAIL, "can't retrieve direct block information");

    /* Lock direct block */
    if (NULL == (dblock = H5HF__man_dblock_protect(hdr, dblock_addr, dblock_size, sec_node->u.single.parent,
                                                   sec_node->u.single.par_entry, H5AC__NO_FLAGS_SET)))
        HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, FAIL, "unable to load fractal heap direct block");

    /* Insert object into block */

    /* Get the offset of the object within the block */
    H5_CHECK_OVERFLOW((sec_node->sect_info.addr - dblock->block_off), hsize_t, size_t);
    blk_off = (size_t)(sec_node->sect_info.addr - dblock->block_off);

    /* Sanity checks */
    assert(sec_node->sect_info.size >= obj_size);

    /* Reduce (& possibly re-add) single section */
    if (H5HF__sect_single_reduce(hdr, sec_node, obj_size) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTSHRINK, FAIL, "can't reduce single section node");
    sec_node = NULL;

    /* Encode the object in the block */
    {
        uint8_t *p; /* Temporary pointer to obj info in block */

        /* Point to location for object */
        p = dblock->blk + blk_off;

        /* Copy the object's data into the heap */
        H5MM_memcpy(p, obj, obj_size);
        p += obj_size;

        /* Sanity check */
        assert((size_t)(p - (dblock->blk + blk_off)) == obj_size);
    } /* end block */

    /* Set the heap ID for the new object (heap offset & obj length) */
    H5HF_MAN_ID_ENCODE(id, hdr, (dblock->block_off + blk_off), obj_size);

    /* Update statistics about heap */
    hdr->man_nobjs++;

    /* Reduce space available in heap (marks header dirty) */
    if (H5HF__hdr_adj_free(hdr, -(ssize_t)obj_size) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTDEC, FAIL, "can't adjust free space for heap");

done:
    /* Release section node on error */
    if (ret_value < 0)
        if (sec_node && H5HF__sect_single_free((H5FS_section_info_t *)sec_node) < 0)
            HDONE_ERROR(H5E_HEAP, H5E_CANTFREE, FAIL, "unable to release section node");

    /* Release the direct block (marked as dirty) */
    if (dblock && H5AC_unprotect(hdr->f, H5AC_FHEAP_DBLOCK, dblock_addr, dblock, H5AC__DIRTIED_FLAG) < 0)
        HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL, "unable to release fractal heap direct block");

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF__man_insert() */

/*-------------------------------------------------------------------------
 * Function:    H5HF__man_get_obj_len
 *
 * Purpose:     Get the size of a managed heap object
 *
 * Return:      SUCCEED (Can't fail)
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF__man_get_obj_len(H5HF_hdr_t *hdr, const uint8_t *id, size_t *obj_len_p)
{

    FUNC_ENTER_PACKAGE_NOERR

    /*
     * Check arguments.
     */
    assert(hdr);
    assert(id);
    assert(obj_len_p);

    /* Skip over the flag byte */
    id++;

    /* Skip over object offset */
    id += hdr->heap_off_size;

    /* Retrieve the entry length */
    UINT64DECODE_VAR(id, *obj_len_p, hdr->heap_len_size);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5HF__man_get_obj_len() */

/*-------------------------------------------------------------------------
 * Function:    H5HF__man_get_obj_off
 *
 * Purpose:     Get the offset of a managed heap object
 *
 * Return:      SUCCEED (Can't fail)
 *
 *-------------------------------------------------------------------------
 */
void
H5HF__man_get_obj_off(const H5HF_hdr_t *hdr, const uint8_t *id, hsize_t *obj_off_p)
{
    FUNC_ENTER_PACKAGE_NOERR

    /*
     * Check arguments.
     */
    assert(hdr);
    assert(id);
    assert(obj_off_p);

    /* Skip over the flag byte */
    id++;

    /* Skip over object offset */
    UINT64DECODE_VAR(id, *obj_off_p, hdr->heap_off_size);

    FUNC_LEAVE_NOAPI_VOID
} /* end H5HF__man_get_obj_off() */

/*-------------------------------------------------------------------------
 * Function:	H5HF__man_op_real
 *
 * Purpose:	Internal routine to perform an operation on a managed heap
 *              object
 *
 * Return:	SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HF__man_op_real(H5HF_hdr_t *hdr, const uint8_t *id, H5HF_operator_t op, void *op_data, unsigned op_flags)
{
    H5HF_direct_t *dblock = NULL;       /* Pointer to direct block to query */
    unsigned       dblock_access_flags; /* Access method for direct block */
                                        /* must equal either
                                         * H5AC__NO_FLAGS_SET or
                                         * H5AC__READ_ONLY_FLAG
                                         */
    haddr_t  dblock_addr = HADDR_UNDEF; /* Direct block address */
    size_t   dblock_size;               /* Direct block size */
    unsigned dblock_cache_flags = 0;    /* Flags for unprotecting direct block */
    hsize_t  obj_off;                   /* Object's offset in heap */
    size_t   obj_len;                   /* Object's length in heap */
    size_t   blk_off;                   /* Offset of object in block */
    uint8_t *p;                         /* Temporary pointer to obj info in block */
    herr_t   ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_PACKAGE

    /*
     * Check arguments.
     */
    assert(hdr);
    assert(id);
    assert(op);

    /* Set the access mode for the direct block */
    if (op_flags & H5HF_OP_MODIFY) {
        /* Check pipeline */
        H5HF_MAN_WRITE_CHECK_PLINE(hdr)

        dblock_access_flags = H5AC__NO_FLAGS_SET;
        dblock_cache_flags  = H5AC__DIRTIED_FLAG;
    } /* end if */
    else {
        dblock_access_flags = H5AC__READ_ONLY_FLAG;
        dblock_cache_flags  = H5AC__NO_FLAGS_SET;
    } /* end else */

    /* Skip over the flag byte */
    id++;

    /* Decode the object offset within the heap & its length */
    UINT64DECODE_VAR(id, obj_off, hdr->heap_off_size);
    UINT64DECODE_VAR(id, obj_len, hdr->heap_len_size);

    /* Check for bad offset or length */
    if (obj_off == 0)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "invalid fractal heap offset");
    if (obj_off > hdr->man_size)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "fractal heap object offset too large");
    if (obj_len == 0)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "invalid fractal heap object size");
    if (obj_len > hdr->man_dtable.cparam.max_direct_size)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "fractal heap object size too large for direct block");
    if (obj_len > hdr->max_man_size)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "fractal heap object should be standalone");

    /* Check for root direct block */
    if (hdr->man_dtable.curr_root_rows == 0) {
        /* Set direct block info */
        dblock_addr = hdr->man_dtable.table_addr;
        dblock_size = hdr->man_dtable.cparam.start_block_size;

        /* Lock direct block */
        if (NULL ==
            (dblock = H5HF__man_dblock_protect(hdr, dblock_addr, dblock_size, NULL, 0, dblock_access_flags)))
            HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, FAIL, "unable to protect fractal heap direct block");
    } /* end if */
    else {
        H5HF_indirect_t *iblock;      /* Pointer to indirect block */
        hbool_t          did_protect; /* Whether we protected the indirect block or not */
        unsigned         entry;       /* Entry of block */

        /* Look up indirect block containing direct block */
        if (H5HF__man_dblock_locate(hdr, obj_off, &iblock, &entry, &did_protect, H5AC__READ_ONLY_FLAG) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTCOMPUTE, FAIL, "can't compute row & column of section");

        /* Set direct block info */
        dblock_addr = iblock->ents[entry].addr;
        H5_CHECK_OVERFLOW((hdr->man_dtable.row_block_size[entry / hdr->man_dtable.cparam.width]), hsize_t,
                          size_t);
        dblock_size = (size_t)hdr->man_dtable.row_block_size[entry / hdr->man_dtable.cparam.width];

        /* Check for offset of invalid direct block */
        if (!H5_addr_defined(dblock_addr)) {
            /* Unlock indirect block */
            if (H5HF__man_iblock_unprotect(iblock, H5AC__NO_FLAGS_SET, did_protect) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL,
                            "unable to release fractal heap indirect block");

            HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "fractal heap ID not in allocated direct block");
        } /* end if */

        /* Lock direct block */
        if (NULL == (dblock = H5HF__man_dblock_protect(hdr, dblock_addr, dblock_size, iblock, entry,
                                                       dblock_access_flags))) {
            /* Unlock indirect block */
            if (H5HF__man_iblock_unprotect(iblock, H5AC__NO_FLAGS_SET, did_protect) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL,
                            "unable to release fractal heap indirect block");

            HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, FAIL, "unable to protect fractal heap direct block");
        } /* end if */

        /* Unlock indirect block */
        if (H5HF__man_iblock_unprotect(iblock, H5AC__NO_FLAGS_SET, did_protect) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL, "unable to release fractal heap indirect block");
        iblock = NULL;
    } /* end else */

    /* Compute offset of object within block */
    assert((obj_off - dblock->block_off) < (hsize_t)dblock_size);
    blk_off = (size_t)(obj_off - dblock->block_off);

    /* Check for object's offset in the direct block prefix information */
    if (blk_off < (size_t)H5HF_MAN_ABS_DIRECT_OVERHEAD(hdr))
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "object located in prefix of direct block");

    /* Check for object's length overrunning the end of the direct block */
    if ((blk_off + obj_len) > dblock_size)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "object overruns end of direct block");

    /* Point to location for object */
    p = dblock->blk + blk_off;

    /* Call the user's 'op' callback */
    if (op(p, obj_len, op_data) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTOPERATE, FAIL, "application's callback failed");

done:
    /* Unlock direct block */
    if (dblock && H5AC_unprotect(hdr->f, H5AC_FHEAP_DBLOCK, dblock_addr, dblock, dblock_cache_flags) < 0)
        HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL, "unable to release fractal heap direct block");

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF__man_op_real() */

/*-------------------------------------------------------------------------
 * Function:	H5HF__man_read
 *
 * Purpose:	Read an object from a managed heap
 *
 * Return:	SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF__man_read(H5HF_hdr_t *hdr, const uint8_t *id, void *obj)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /*
     * Check arguments.
     */
    assert(hdr);
    assert(id);
    assert(obj);

    /* Call the internal 'op' routine routine */
    if (H5HF__man_op_real(hdr, id, H5HF__op_read, obj, 0) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTOPERATE, FAIL, "unable to operate on heap object");

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF__man_read() */

/*-------------------------------------------------------------------------
 * Function:	H5HF__man_write
 *
 * Purpose:	Write an object to a managed heap
 *
 * Return:	SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF__man_write(H5HF_hdr_t *hdr, const uint8_t *id, const void *obj)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /*
     * Check arguments.
     */
    assert(hdr);
    assert(id);
    assert(obj);

    /* Call the internal 'op' routine routine
     *
     * In this case, the callback operation needs to modify the obj buffer that
     * was passed in as const. We quiet the warning here because an obj pointer
     * that was originally const should *never* arrive here.
     */
    H5_GCC_CLANG_DIAG_OFF("cast-qual")
    if (H5HF__man_op_real(hdr, id, H5HF__op_write, (void *)obj, H5HF_OP_MODIFY) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTOPERATE, FAIL, "unable to operate on heap object");
    H5_GCC_CLANG_DIAG_ON("cast-qual")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF__man_write() */

/*-------------------------------------------------------------------------
 * Function:	H5HF__man_op
 *
 * Purpose:	Operate directly on an object from a managed heap
 *
 * Return:	SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF__man_op(H5HF_hdr_t *hdr, const uint8_t *id, H5HF_operator_t op, void *op_data)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /*
     * Check arguments.
     */
    assert(hdr);
    assert(id);
    assert(op);

    /* Call the internal 'op' routine routine */
    if (H5HF__man_op_real(hdr, id, op, op_data, 0) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTOPERATE, FAIL, "unable to operate on heap object");

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF__man_op() */

/*-------------------------------------------------------------------------
 * Function:	H5HF__man_remove
 *
 * Purpose:	Remove an object from a managed heap
 *
 * Return:	SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF__man_remove(H5HF_hdr_t *hdr, const uint8_t *id)
{
    H5HF_free_section_t *sec_node    = NULL;  /* Pointer to free space section for block */
    H5HF_indirect_t     *iblock      = NULL;  /* Pointer to indirect block */
    hbool_t              did_protect = FALSE; /* Whether we protected the indirect block or not */
    hsize_t              obj_off;             /* Object's offset in heap */
    size_t               obj_len;             /* Object's length in heap */
    size_t               dblock_size;         /* Direct block size */
    hsize_t              dblock_block_off;    /* Offset of the direct block within the heap's address space */
    unsigned             dblock_entry;        /* Entry of direct block in parent indirect block */
    size_t               blk_off;             /* Offset of object in block */
    herr_t               ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /*
     * Check arguments.
     */
    assert(hdr);
    assert(id);

    /* Check pipeline */
    H5HF_MAN_WRITE_CHECK_PLINE(hdr)

    /* Skip over the flag byte */
    id++;

    /* Decode the object offset within the heap & it's length */
    UINT64DECODE_VAR(id, obj_off, hdr->heap_off_size);
    UINT64DECODE_VAR(id, obj_len, hdr->heap_len_size);

    /* Check for bad offset or length */
    if (obj_off == 0)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "invalid fractal heap offset");
    if (obj_off > hdr->man_size)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "fractal heap object offset too large");
    if (obj_len == 0)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "invalid fractal heap object size");
    if (obj_len > hdr->man_dtable.cparam.max_direct_size)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "fractal heap object size too large for direct block");
    if (obj_len > hdr->max_man_size)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "fractal heap object should be standalone");

    /* Check for root direct block */
    if (hdr->man_dtable.curr_root_rows == 0) {
        /* Set direct block info */
        dblock_size      = hdr->man_dtable.cparam.start_block_size;
        dblock_block_off = 0;
        dblock_entry     = 0;
    } /* end if */
    else {
        /* Look up indirect block containing direct block */
        if (H5HF__man_dblock_locate(hdr, obj_off, &iblock, &dblock_entry, &did_protect, H5AC__NO_FLAGS_SET) <
            0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTCOMPUTE, FAIL, "can't compute row & column of section");

        /* Check for offset of invalid direct block */
        if (!H5_addr_defined(iblock->ents[dblock_entry].addr))
            HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "fractal heap ID not in allocated direct block");

        /* Set direct block info */
        H5_CHECK_OVERFLOW((hdr->man_dtable.row_block_size[dblock_entry / hdr->man_dtable.cparam.width]),
                          hsize_t, size_t);
        dblock_size = (size_t)(hdr->man_dtable.row_block_size[dblock_entry / hdr->man_dtable.cparam.width]);

        /* Compute the direct block's offset in the heap's address space */
        /* (based on parent indirect block's block offset) */
        dblock_block_off = iblock->block_off;
        dblock_block_off += hdr->man_dtable.row_block_off[dblock_entry / hdr->man_dtable.cparam.width];
        dblock_block_off += hdr->man_dtable.row_block_size[dblock_entry / hdr->man_dtable.cparam.width] *
                            (dblock_entry % hdr->man_dtable.cparam.width);
    } /* end else */

    /* Compute offset of object within block */
    assert((obj_off - dblock_block_off) < (hsize_t)dblock_size);
    blk_off = (size_t)(obj_off - dblock_block_off);

    /* Check for object's offset in the direct block prefix information */
    if (blk_off < (size_t)H5HF_MAN_ABS_DIRECT_OVERHEAD(hdr))
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "object located in prefix of direct block");

    /* Check for object's length overrunning the end of the direct block */
    if ((blk_off + obj_len) > dblock_size)
        HGOTO_ERROR(H5E_HEAP, H5E_BADRANGE, FAIL, "object overruns end of direct block");

    /* Create free space section node */
    if (NULL == (sec_node = H5HF__sect_single_new(obj_off, obj_len, iblock, dblock_entry)))
        HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't create section for direct block's free space");

    /* Unlock indirect block */
    if (iblock) {
        if (H5HF__man_iblock_unprotect(iblock, H5AC__NO_FLAGS_SET, did_protect) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL, "unable to release fractal heap indirect block");
        iblock = NULL;
    } /* end if */

    /* Increase space available in heap (marks header dirty) */
    if (H5HF__hdr_adj_free(hdr, (ssize_t)obj_len) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTDEC, FAIL, "can't adjust free space for heap");

    /* Update statistics about heap */
    hdr->man_nobjs--;

    /* Return free space to the heap's list of space */
    if (H5HF__space_add(hdr, sec_node, H5FS_ADD_RETURNED_SPACE) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't add direct block free space to global list");
    sec_node = NULL;

done:
    if (ret_value < 0) {
        /* Release section node */
        if (sec_node && H5HF__sect_single_free((H5FS_section_info_t *)sec_node) < 0)
            HDONE_ERROR(H5E_HEAP, H5E_CANTFREE, FAIL, "unable to release section node");
    } /* end if */

    /* Unlock indirect block */
    if (iblock && H5HF__man_iblock_unprotect(iblock, H5AC__NO_FLAGS_SET, did_protect) < 0)
        HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL, "unable to release fractal heap indirect block");

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF__man_remove() */