« back to all changes in this revision
Viewing changes to plugin/pbms/src/alias_ms.cc
- browse files at revision 2475
- compare with another revision
- compare with revision 1241.15.6
- download diff
- download tarball
- view history from revision 2475
- Committer: Mark Atwood
- Date: 2011-12-20 02:32:53 UTC
- mfrom: (2469.1.1 drizzle-build)
- Revision ID: me@mark.atwood.name-20111220023253-bvu0kr14kwsdvz7g
merge lp:~brianaker/drizzle/deprecate-pbms
- files removed:
- plugin/pbms
- plugin/pbms/docs
- plugin/pbms/src
- plugin/pbms/src/cslib
- plugin/pbms/tests
- plugin/pbms/tests/r
- plugin/pbms/tests/t
added
removed
plugin/pbms/src/alias_ms.cc
1
/* Copyright (C) 2008 PrimeBase Technologies GmbH, Germany
2
*
3
* PrimeBase Media Stream for MySQL
4
*
5
* This program is free software; you can redistribute it and/or modify
6
* it under the terms of the GNU General Public License as published by
7
* the Free Software Foundation; either version 2 of the License, or
8
* (at your option) any later version.
9
*
10
* This program is distributed in the hope that it will be useful,
11
* but WITHOUT ANY WARRANTY; without even the implied warranty of
12
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13
* GNU General Public License for more details.
14
*
15
* You should have received a copy of the GNU General Public License
16
* along with this program; if not, write to the Free Software
17
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
*
19
* Barry Leslie
20
*
21
* 2008-12-30
22
*
23
* H&G2JCtL
24
*
25
* BLOB alias index.
26
*
27
*/
28
29
#ifdef HAVE_ALIAS_SUPPORT
30
#include "cslib/CSConfig.h"
31
32
#include "string.h"
33
34
#ifdef DRIZZLED
35
#include <drizzled/common.h>
36
#endif
37
38
#include "cslib/CSGlobal.h"
39
#include "cslib/CSLog.h"
40
#include "cslib/CSStrUtil.h"
41
#include "cslib/CSFile.h"
42
#include "system_table_ms.h"
43
#include "database_ms.h"
44
45
#include "alias_ms.h"
46
47
48
49
//------------------------
50
MSAlias::~MSAlias()
51
{
52
enter_();
53
54
ASSERT(iClosing);
55
ASSERT(iPoolSysTables.getSize() == 0);
56
57
58
if (iFilePath) {
59
60
if (iDelete)
61
iFilePath->removeFile();
62
63
iFilePath->release();
64
}
65
66
if (iFileShare)
67
iFileShare->release();
68
69
exit_();
70
}
71
72
//------------------------
73
MSAlias::MSAlias(MSDatabase *db_noref)
74
{
75
iClosing = false;
76
iDelete = false;
77
iDatabase_br = db_noref;
78
iFilePath = NULL;
79
iFileShare = NULL;
80
}
81
82
//------------------------
83
void MSAlias::ma_close()
84
{
85
enter_();
86
87
iClosing = true;
88
if (iFileShare)
89
iFileShare->close();
90
iPoolSysTables.clear();
91
exit_();
92
}
93
94
//------------------------
95
// Compress the index bucket chain and free unused buckets.
96
void MSAlias::MSAliasCompress(CSFile *fa, CSSortedList *freeList, MSABucketLinkedList *bucketChain)
97
{
98
// For now I will just remove empty buckets.
99
// Later this function should also compress the records also
100
// thus making the searches faster and freeing up more space.
101
MSABucketInfo *b_info, *next;
102
103
b_info = bucketChain->getFront();
104
while (b_info) {
105
next = b_info->getNextLink();
106
if (b_info->getSize() == 0) {
107
bucketChain->remove(RETAIN(b_info));
108
freeList->add(b_info);
109
}
110
b_info = next;
111
}
112
113
}
114
115
//------------------------
116
void MSAlias::MSAliasLoad()
117
{
118
CSFile *fa = NULL;
119
CSSortedList freeList;
120
off64_t fileSize;
121
122
enter_();
123
124
fa = CSFile::newFile(RETAIN(iFilePath));
125
push_(fa);
126
127
MSAliasHeadRec header;
128
uint64_t free_list_offset;
129
fa->open(CSFile::DEFAULT);
130
fa->read(&header, 0, sizeof(header), sizeof(header));
131
132
/* Check the file header: */
133
if (CS_GET_DISK_4(header.ah_magic_4) != MS_ALIAS_FILE_MAGIC)
134
CSException::throwFileError(CS_CONTEXT, iFilePath->getCString(), CS_ERR_BAD_HEADER_MAGIC);
135
if (CS_GET_DISK_2(header.ah_version_2) != MS_ALIAS_FILE_VERSION)
136
CSException::throwFileError(CS_CONTEXT, iFilePath->getCString(), CS_ERR_VERSION_TOO_NEW);
137
138
free_list_offset = CS_GET_DISK_8(header.ah_free_list_8);
139
140
fileSize = CS_GET_DISK_8(header.ah_file_size_8);
141
142
// Do some sanity checks.
143
if (CS_GET_DISK_2(header.ah_head_size_2) != sizeof(header))
144
CSException::throwFileError(CS_CONTEXT, iFilePath->getCString(), CS_ERR_BAD_FILE_HEADER);
145
146
if (CS_GET_DISK_2(header.ah_num_buckets_2) != BUCKET_LIST_SIZE)
147
CSException::throwFileError(CS_CONTEXT, iFilePath->getCString(), CS_ERR_BAD_FILE_HEADER);
148
149
if (CS_GET_DISK_4(header.ah_bucket_size_4) != NUM_RECORDS_PER_BUCKET)
150
CSException::throwFileError(CS_CONTEXT, iFilePath->getCString(), CS_ERR_BAD_FILE_HEADER);
151
152
if (fileSize != fa->getEOF())
153
CSException::throwFileError(CS_CONTEXT, iFilePath->getCString(), CS_ERR_BAD_FILE_HEADER);
154
155
// Load the bucket headers into RAM
156
MSADiskBucketHeadRec bucketHead = {0};
157
uint64_t offset, start_offset;
158
159
// Fist load the free list:
160
if (free_list_offset) {
161
start_offset = offset = free_list_offset;
162
do {
163
fa->read(&bucketHead, offset, sizeof(MSADiskBucketHeadRec), sizeof(MSADiskBucketHeadRec));
164
freeList.add(MSABucketInfo::newMSABucketInfo(offset));
165
offset = CS_GET_DISK_8(bucketHead.ab_next_bucket_8);
166
} while (offset != start_offset);
167
168
}
169
for (uint32_t i = 0; i < BUCKET_LIST_SIZE; i++) {
170
uint64_t used, total_space;
171
MSABucketLinkedList *bucketChain = &(iFileShare->msa_buckets[i]);
172
173
start_offset = offset = sizeof(header) + i * sizeof(MSADiskBucketRec);
174
used = total_space = 0;
175
do {
176
uint32_t num, end_of_records;
177
178
fa->read(&bucketHead, offset, sizeof(MSADiskBucketHeadRec), sizeof(MSADiskBucketHeadRec));
179
num = CS_GET_DISK_4(bucketHead.ab_num_recs_4);
180
end_of_records = CS_GET_DISK_4(bucketHead.ab_eor_rec_4);
181
total_space += NUM_RECORDS_PER_BUCKET;
182
used += num;
183
bucketChain->addFront(MSABucketInfo::newMSABucketInfo(offset, num, end_of_records));
184
offset = CS_GET_DISK_8(bucketHead.ab_next_bucket_8);
185
186
} while (offset != start_offset);
187
188
// Pack the index if required
189
if (((total_space - used) / NUM_RECORDS_PER_BUCKET) > 1)
190
MSAliasCompress(fa, &freeList, bucketChain);
191
192
}
193
194
// If there are free buckets try to free up some disk
195
// space or add them to a free list to be reused later.
196
if (freeList.getSize()) {
197
uint64_t last_bucket = fileSize - sizeof(MSADiskBucketRec);
198
MSABucketInfo *rec;
199
bool reduce = false;
200
201
// Search for freed buckets at the end of the file
202
// so that they can be released and the file
203
// shrunk.
204
//
205
// The free list has been sorted so that buckets
206
// with the highest file offset are first.
207
do {
208
rec = (MSABucketInfo*) freeList.itemAt(0);
209
if (rec->bi_bucket_offset != last_bucket);
210
break;
211
212
last_bucket -= sizeof(MSADiskBucketRec);
213
freeList.remove(rec);
214
reduce = true;
215
} while (freeList.getSize());
216
217
if (reduce) {
218
// The file can be reduced in size.
219
fileSize = last_bucket + sizeof(MSADiskBucketRec);
220
fa->setEOF(fileSize);
221
CS_SET_DISK_8(header.ah_file_size_8, fileSize);
222
fa->write(&header.ah_file_size_8, offsetof(MSAliasHeadRec,ah_file_size_8) , 8);
223
}
224
225
// Add the empty buckets to the index file's empty bucket list.
226
memset(&bucketHead, 0, sizeof(bucketHead));
227
offset = 0;
228
while (freeList.getSize()) { // Add the empty buckets to the empty_bucket list.
229
rec = (MSABucketInfo*) freeList.takeItemAt(0);
230
231
// buckets are added to the front of the list.
232
fa->write(&offset, rec->bi_bucket_offset + offsetof(MSADiskBucketHeadRec,ab_next_bucket_8) , 8);
233
offset = rec->bi_bucket_offset;
234
fa->write(&offset, offsetof(MSAliasHeadRec,ah_free_list_8) , 8);
235
236
iFileShare->msa_empty_buckets.addFront(rec);
237
}
238
}
239
240
iFileShare->msa_fileSize = fa->getEOF();
241
242
release_(fa);
243
exit_();
244
}
245
246
//------------------------
247
void MSAlias::buildAliasIndex()
248
{
249
MSBlobHeadRec blob;
250
MSRepository *repo;
251
uint64_t blob_size, fileSize, offset;
252
uint16_t head_size;
253
MSAliasFile *afile;
254
MSAliasRec aliasRec;
255
256
enter_();
257
258
afile = getAliasFile();
259
frompool_(afile);
260
261
afile->startLoad();
262
263
CSSyncVector *repo_list = iDatabase_br->getRepositoryList();
264
265
// No locking is required since the index is loaded before the database is opened
266
// and the compactor thread is started.
267
268
for (uint32_t repo_index =0; repo_index<repo_list->size(); repo_index++) {
269
if ((repo = (MSRepository *) repo_list->get(repo_index))) {
270
MSRepoFile *repoFile = repo->openRepoFile();
271
push_(repoFile);
272
fileSize = repo->getRepoFileSize();
273
offset = repo->getRepoHeadSize();
274
275
aliasRec.repo_id = repoFile->myRepo->getRepoID();
276
277
while (offset < fileSize) {
278
if (repoFile->read(&blob, offset, sizeof(MSBlobHeadRec), 0) < sizeof(MSBlobHeadRec))
279
break;
280
281
if ((CS_GET_DISK_1(blob.rb_status_1) == MS_BLOB_REFERENCED) && CS_GET_DISK_2(blob.rb_alias_offset_2)) {
282
aliasRec.repo_offset = offset;
283
aliasRec.alias_hash = CS_GET_DISK_4(blob.rb_alias_hash_4);
284
addAlias(afile, &aliasRec);
285
}
286
287
head_size = CS_GET_DISK_2(blob.rb_head_size_2);
288
blob_size = CS_GET_DISK_6(blob.rb_blob_repo_size_6);
289
offset += head_size + blob_size;
290
}
291
292
release_(repoFile);
293
}
294
}
295
296
afile->finishLoad();
297
backtopool_(afile);
298
299
exit_();
300
}
301
302
//------------------------
303
void MSAlias::MSAliasBuild()
304
{
305
CSFile *fa;
306
MSAliasHeadRec header = {0};
307
uint64_t offset, size = sizeof(header) + BUCKET_LIST_SIZE * sizeof(MSADiskBucketRec);
308
enter_();
309
310
fa = CSFile::newFile(RETAIN(iFilePath));
311
push_(fa);
312
313
fa->open(CSFile::CREATE | CSFile::TRUNCATE);
314
315
// Create an empty index with 1 empty bucket in each bucket chain.
316
317
CS_SET_DISK_4(header.ah_magic_4, MS_ALIAS_FILE_MAGIC);
318
CS_SET_DISK_2(header.ah_version_2, MS_ALIAS_FILE_VERSION);
319
320
CS_SET_DISK_2(header.ah_head_size_2, sizeof(header));
321
CS_SET_DISK_8(header.ah_file_size_8, size);
322
323
CS_SET_DISK_2(header.ah_num_buckets_2, BUCKET_LIST_SIZE);
324
CS_SET_DISK_2(header.ah_bucket_size_4, NUM_RECORDS_PER_BUCKET);
325
326
fa->setEOF(size); // Grow the file.
327
fa->write(&header, 0, sizeof(header));
328
329
offset = sizeof(header);
330
331
// Initialize the file bucket chains.
332
MSADiskBucketHeadRec bucketHead = {0};
333
for (uint32_t i = 0; i < BUCKET_LIST_SIZE; i++) {
334
CS_SET_DISK_8(bucketHead.ab_prev_bucket_8, offset);
335
CS_SET_DISK_8(bucketHead.ab_next_bucket_8, offset);
336
fa->write(&bucketHead, offset, sizeof(MSADiskBucketHeadRec));
337
// Add the bucket to the RAM based list.
338
iFileShare->msa_buckets[i].addFront(MSABucketInfo::newMSABucketInfo(offset));
339
offset += sizeof(MSADiskBucketRec); // NOTE: MSADiskBucketRec not MSADiskBucketHeadRec
340
}
341
342
fa->sync();
343
344
345
346
fa->close();
347
348
release_(fa);
349
350
// Scan through all the BLOBs in the repository and add an entry
351
// for each blob alias.
352
buildAliasIndex();
353
354
exit_();
355
}
356
357
//------------------------
358
void MSAlias::ma_open(const char *file_name)
359
{
360
bool isdir = false;
361
362
enter_();
363
364
iFilePath = CSPath::newPath(RETAIN(iDatabase_br->myDatabasePath), file_name);
365
366
retry:
367
new_(iFileShare, MSAliasFileShare(RETAIN(iFilePath)));
368
369
if (iFilePath->exists(&isdir)) {
370
try_(a) {
371
MSAliasLoad();
372
}
373
catch_(a) {
374
// If an error occurs delete the index and rebuild it.
375
self->myException.log(NULL);
376
iFileShare->release();
377
iFilePath->removeFile();
378
goto retry;
379
}
380
cont_(a);
381
} else
382
MSAliasBuild();
383
384
385
exit_();
386
}
387
388
//------------------------
389
uint32_t MSAlias::hashAlias(const char *ptr)
390
{
391
register uint32_t h = 0, g;
392
393
while (*ptr) {
394
h = (h << 4) + (uint32_t) toupper(*ptr++);
395
if ((g = (h & 0xF0000000)))
396
h = (h ^ (g >> 24)) ^ g;
397
}
398
399
return (h);
400
}
401
402
//------------------------
403
void MSAlias::addAlias(MSAliasFile *af, MSAliasRec *rec)
404
{
405
MSDiskAliasRec diskRec;
406
CS_SET_DISK_4(diskRec.ar_repo_id_4, rec->repo_id);
407
CS_SET_DISK_8(diskRec.ar_offset_8, rec->repo_offset);
408
CS_SET_DISK_4(diskRec.ar_hash_4, rec->alias_hash);
409
af->addRec(&diskRec);
410
411
}
412
413
//------------------------
414
uint32_t MSAlias::addAlias(uint32_t repo_id, uint64_t repo_offset, const char *alias)
415
{
416
MSDiskAliasRec diskRec;
417
uint32_t hash;
418
uint32_t f_repo_id;
419
uint64_t f_repo_offset;
420
bool referenced = false;
421
enter_();
422
423
hash = hashAlias(alias);
424
425
// Use a lock to make sure that the same alias cannot be added at the same time.
426
lock_(this);
427
428
MSAliasFile *af = getAliasFile();
429
frompool_(af);
430
431
if (findBlobByAlias(RETAIN(af), alias, &referenced, &f_repo_id, &f_repo_offset)) {
432
if ((f_repo_id == repo_id) && (f_repo_offset == repo_offset))
433
goto done; // Do not treat this as an error.
434
if (!referenced) {
435
// If the alias is in use by a non referenced BLOB then delete it.
436
// This can happen because I allow newly created BLOBs to be accessed
437
// by their alias even before a reference to the BLOB has been added to
438
// the database.
439
af->deleteCurrentRec();
440
} else {
441
#ifdef xxDEBUG
442
CSL.log(self, CSLog::Protocol, "Alias: ");
443
CSL.log(self, CSLog::Protocol, alias);
444
CSL.log(self, CSLog::Protocol, "\n");
445
#endif
446
CSException::throwException(CS_CONTEXT, MS_ERR_DUPLICATE, "Alias Exists");
447
}
448
}
449
450
CS_SET_DISK_4(diskRec.ar_repo_id_4, repo_id);
451
CS_SET_DISK_8(diskRec.ar_offset_8, repo_offset);
452
CS_SET_DISK_4(diskRec.ar_hash_4, hash);
453
454
af->addRec(&diskRec);
455
done:
456
backtopool_(af);
457
458
unlock_(this);
459
return_(hash);
460
}
461
462
//------------------------
463
void MSAlias::deleteAlias(MSDiskAliasPtr diskRec)
464
{
465
enter_();
466
467
MSAliasFile *af = getAliasFile();
468
frompool_(af);
469
if (af->findRec(diskRec))
470
af->deleteCurrentRec();
471
backtopool_(af);
472
473
exit_();
474
}
475
476
//------------------------
477
void MSAlias::deleteAlias(uint32_t repo_id, uint64_t repo_offset, uint32_t alias_hash)
478
{
479
MSDiskAliasRec diskRec;
480
481
CS_SET_DISK_4(diskRec.ar_repo_id_4, repo_id);
482
CS_SET_DISK_8(diskRec.ar_offset_8, repo_offset);
483
CS_SET_DISK_4(diskRec.ar_hash_4, alias_hash);
484
deleteAlias(&diskRec);
485
486
}
487
//------------------------
488
void MSAlias::resetAlias(uint32_t old_repo_id, uint64_t old_repo_offset, uint32_t alias_hash, uint32_t new_repo_id, uint64_t new_repo_offset)
489
{
490
MSDiskAliasRec diskRec;
491
bool found;
492
enter_();
493
494
CS_SET_DISK_4(diskRec.ar_repo_id_4, old_repo_id);
495
CS_SET_DISK_8(diskRec.ar_offset_8, old_repo_offset);
496
CS_SET_DISK_4(diskRec.ar_hash_4, alias_hash);
497
498
lock_(this);
499
500
MSAliasFile *af = getAliasFile();
501
frompool_(af);
502
found = af->findRec(&diskRec);
503
CS_SET_DISK_4(diskRec.ar_repo_id_4, new_repo_id);
504
CS_SET_DISK_8(diskRec.ar_offset_8, new_repo_offset);
505
506
if (found)
507
af->updateCurrentRec(&diskRec);
508
else {
509
CSException::logException(CS_CONTEXT, MS_ERR_NOT_FOUND, "Alias doesn't exists");
510
af->addRec(&diskRec);
511
}
512
513
backtopool_(af);
514
515
unlock_(this);
516
exit_();
517
}
518
519
//------------------------
520
// Check to see if the blob with the given repo_id
521
// and repo_offset has the specified alias.
522
bool MSAlias::hasBlobAlias(uint32_t repo_id, uint64_t repo_offset, const char *alias, bool *referenced)
523
{
524
bool found = false;
525
MSRepoFile *repoFile;
526
MSBlobHeadRec blob;
527
uint8_t status;
528
uint64_t offset;
529
uint32_t alias_size = strlen(alias) +1;
530
char blob_alias[BLOB_ALIAS_LENGTH +1];
531
532
if (alias_size > BLOB_ALIAS_LENGTH)
533
return false;
534
535
enter_();
536
537
repoFile = iDatabase_br->getRepoFileFromPool(repo_id, false);
538
frompool_(repoFile);
539
540
repoFile->read(&blob, repo_offset, sizeof(MSBlobHeadRec), sizeof(MSBlobHeadRec));
541
status = CS_GET_DISK_1(blob.rb_status_1);
542
if (IN_USE_BLOB_STATUS(status)) {
543
offset = repo_offset + CS_GET_DISK_2(blob.rb_alias_offset_2);
544
545
blob_alias[BLOB_ALIAS_LENGTH] = 0;
546
if (repoFile->read(blob_alias, offset, alias_size, 0) == alias_size) {
547
found = !my_charset_utf8_general_ci.strcasecmp(blob_alias, alias);
548
if (found)
549
*referenced = (status == MS_BLOB_REFERENCED);
550
}
551
} else {
552
CSException::logException(CS_CONTEXT, MS_ERR_ENGINE, "Deleted BLOB alias found. (Rebuild BLOB alias index.)");
553
}
554
555
556
backtopool_(repoFile);
557
558
return_(found);
559
}
560
561
//------------------------
562
bool MSAlias::findBlobByAlias( MSAliasFile *af, const char *alias, bool *referenced, uint32_t *repo_id, uint64_t *repo_offset)
563
{
564
bool found = false;
565
uint32_t hash, l_repo_id, l_repo_offset;
566
MSDiskAliasPtr diskRec;
567
enter_();
568
569
push_(af);
570
571
hash = hashAlias(alias);
572
diskRec = af->findRec(hash);
573
574
while (diskRec && !found) {
575
l_repo_id = CS_GET_DISK_4(diskRec->ar_repo_id_4);
576
l_repo_offset = CS_GET_DISK_8(diskRec->ar_offset_8);
577
if (hasBlobAlias(l_repo_id, l_repo_offset, alias, referenced))
578
found = true;
579
else
580
diskRec = af->nextRec();
581
}
582
583
if (found) {
584
if (repo_id)
585
*repo_id = l_repo_id;
586
587
if (repo_offset)
588
*repo_offset = l_repo_offset;
589
}
590
591
release_(af);
592
return_(found);
593
}
594
//------------------------
595
bool MSAlias::findBlobByAlias( const char *alias, bool *referenced, uint32_t *repo_id, uint64_t *repo_offset)
596
{
597
bool found;
598
enter_();
599
600
MSAliasFile *af = getAliasFile();
601
frompool_(af);
602
603
found = findBlobByAlias(RETAIN(af), alias, referenced, repo_id, repo_offset);
604
605
backtopool_(af);
606
return_(found);
607
}
608
609
//------------------------
610
bool MSAlias::blobAliasExists(uint32_t repo_id, uint64_t repo_offset, uint32_t alias_hash)
611
{
612
bool found;
613
MSDiskAliasRec diskRec;
614
615
CS_SET_DISK_4(diskRec.ar_repo_id_4, repo_id);
616
CS_SET_DISK_8(diskRec.ar_offset_8, repo_offset);
617
CS_SET_DISK_4(diskRec.ar_hash_4, alias_hash);
618
619
enter_();
620
621
MSAliasFile *af = getAliasFile();
622
frompool_(af);
623
624
found = af->findRec(&diskRec);
625
626
backtopool_(af);
627
return_(found);
628
}
629
630
/////////////////////////////////////
631
MSSysMeta::MSSysMeta(MSAlias *msa)
632
{
633
md_myMSAlias = msa;
634
md_isFileInUse = false;
635
md_NextLink = md_PrevLink = NULL;
636
637
mtab = MSMetaDataTable::newMSMetaDataTable(RETAIN(msa->iDatabase_br));
638
}
639
640
//------------------------
641
MSSysMeta::~MSSysMeta()
642
{
643
if (mtab)
644
mtab->release();
645
646
if (md_myMSAlias)
647
md_myMSAlias->release();
648
}
649
650
//------------------------
651
void MSSysMeta::returnToPool()
652
{
653
enter_();
654
push_(this);
655
656
657
md_isFileInUse = false;
658
659
if (!md_myMSAlias->iClosing) {
660
lock_(&md_myMSAlias->iSysTablePoolLock); // It may be better if the pool had it's own lock.
661
md_nextFile = md_myMSAlias->iSysTablePool;
662
md_myMSAlias->iSysTablePool - this;
663
unlock_(&md_myMSAlias->iSysTablePoolLock);
664
}
665
666
release_(this);
667
exit_();
668
}
669
//------------------------
670
bool MSSysMeta::matchAlias(uint32_t repo_id, uint64_t repo_offset, const char *alias)
671
{
672
mtab->seqScanInit();
673
return mtab->matchAlias(repo_id, repo_offset, alias);
674
}
675
676
/////////////////////////////////////
677
/////////////////////////////////////
678
MSAliasFile::MSAliasFile(MSAliasFileShare *share)
679
{
680
ba_share = share;
681
ba_isFileInUse = false;
682
ba_NextLink = ba_PrevLink = NULL;
683
684
iCurrentRec = 0;
685
iBucketCache = NULL;
686
iStartBucket = iCurrentBucket = NULL;
687
iBucketChain = NULL;
688
iLoading = false;
689
ba_nextFile = NULL;
690
691
iFile = CSFile::newFile(RETAIN(ba_share->msa_filePath));
692
iFile->open(CSFile::DEFAULT);
693
694
695
}
696
697
//------------------------
698
MSAliasFile::~MSAliasFile()
699
{
700
if (iFile)
701
iFile->release();
702
703
if (iBucketCache)
704
cs_free(iBucketCache);
705
}
706
707
//------------------------
708
void MSAliasFile::startLoad()
709
{
710
enter_();
711
712
ASSERT(!iLoading);
713
714
// iBucketCache = (MSADiskBucketRec*) cs_malloc(BUCKET_LIST_SIZE * sizeof(MSADiskBucketRec));
715
// memset(iBucketCache, 0, BUCKET_LIST_SIZE * sizeof(MSADiskBucketRec));
716
iLoading = true;
717
718
exit_();
719
}
720
721
//------------------------
722
void MSAliasFile::finishLoad()
723
{
724
enter_();
725
ASSERT(iLoading);
726
// Write the bucket cache to disk.
727
// for (iCurrentBucket && iCurrentBucket->getSize()) {
728
// To Be implemented.
729
// }
730
// cs_free(iBucketCache);
731
iBucketCache = NULL;
732
iLoading = false;
733
exit_();
734
}
735
736
//------------------------
737
void MSAliasFile::returnToPool()
738
{
739
enter_();
740
push_(this);
741
742
if (iLoading) {
743
// If iLoading is still set then probably an exception has been thrown.
744
try_(a) {
745
finishLoad();
746
}
747
catch_(a)
748
iLoading = false;
749
cont_(a);
750
}
751
752
ba_isFileInUse = false;
753
754
if (!ba_share->msa_closing) {
755
lock_(&ba_share->msa_poolLock);
756
ba_nextFile = ba_share->msa_pool;
757
ba_share->msa_pool = this;
758
unlock_(&ba_share->msa_poolLock);
759
}
760
761
release_(this);
762
exit_();
763
}
764
765
//------------------------
766
// The bucket chain is treated as a circular list.
767
bool MSAliasFile::nextBucket(bool with_space)
768
{
769
bool have_bucket = false;
770
enter_();
771
772
while (!have_bucket){
773
if (iCurrentBucket) {
774
iCurrentBucket = iCurrentBucket->getNextLink();
775
if (!iCurrentBucket)
776
iCurrentBucket = iBucketChain->getFront();
777
if (iCurrentBucket == iStartBucket)
778
break;
779
} else {
780
iCurrentBucket = iBucketChain->getFront();
781
iStartBucket = iCurrentBucket;
782
}
783
784
if ((iCurrentBucket->getSize() && !with_space) || (with_space && (iCurrentBucket->getSize() < NUM_RECORDS_PER_BUCKET))){
785
// Only read the portion of the bucket containing records.
786
iCurrentRec = iCurrentBucket->getEndOfRecords(); // The current record is set just beyond the last valid record.
787
size_t size = iCurrentRec * sizeof(MSDiskAliasRec);
788
iFile->read(iBucket, iCurrentBucket->bi_records_offset, size, size);
789
have_bucket = true;
790
}
791
}
792
793
return_(have_bucket);
794
}
795
796
//------------------------
797
MSDiskAliasPtr MSAliasFile::nextRec()
798
{
799
MSDiskAliasPtr rec = NULL;
800
bool have_rec;
801
enter_();
802
803
while ((!(have_rec = scanBucket())) && nextBucket(false));
804
805
if (have_rec)
806
rec = &(iBucket[iCurrentRec]);
807
808
return_(rec);
809
}
810
811
//------------------------
812
// When starting a search:
813
// If a bucket is already loaded and it is in the correct bucket chain
814
// then search it first. In this case then the search starts at the current
815
// bucket in the chain.
816
//
817
// Searches are from back to front with the idea that the more recently
818
// added objects will be seached for more often and they are more likely
819
// to be at the end of the chain.
820
MSDiskAliasPtr MSAliasFile::findRec(uint32_t hash)
821
{
822
MSDiskAliasPtr rec = NULL;
823
MSABucketLinkedList *list = ba_share->getBucketChain(hash);
824
enter_();
825
826
CS_SET_DISK_4(iDiskHash_4, hash);
827
if (list == iBucketChain) {
828
// The search is performed back to front.
829
iCurrentRec = iCurrentBucket->getEndOfRecords(); // Position the start just beyond the last valid record.
830
iStartBucket = iCurrentBucket;
831
if (scanBucket()) {
832
rec = &(iBucket[iCurrentRec]);
833
goto done;
834
}
835
} else {
836
iBucketChain = list;
837
iCurrentBucket = NULL;
838
iStartBucket = NULL;
839
}
840
841
if (nextBucket(false))
842
rec = nextRec();
843
844
done:
845
return_(rec);
846
}
847
848
//------------------------
849
bool MSAliasFile::findRec(MSDiskAliasPtr theRec)
850
{
851
MSDiskAliasPtr aRec = NULL;
852
bool found = false;
853
enter_();
854
855
aRec = findRec(CS_GET_DISK_4(theRec->ar_hash_4));
856
while ( aRec && !found) {
857
if (CS_EQ_DISK_4(aRec->ar_repo_id_4, theRec->ar_repo_id_4) && CS_EQ_DISK_8(aRec->ar_offset_8, theRec->ar_offset_8))
858
found = true;
859
else
860
aRec = nextRec();
861
}
862
return_(found);
863
}
864
865
//------------------------
866
void MSAliasFile::addRec(MSDiskAliasPtr new_rec)
867
{
868
MSABucketLinkedList *list = ba_share->getBucketChain(CS_GET_DISK_4(new_rec->ar_hash_4));
869
enter_();
870
lock_(&ba_share->msa_writeLock);
871
872
if (iBucketChain != list) {
873
iBucketChain = list;
874
iCurrentBucket = NULL;
875
iStartBucket = NULL;
876
} else
877
iStartBucket = iCurrentBucket;
878
879
if ((iCurrentBucket && (iCurrentBucket->getSize() < NUM_RECORDS_PER_BUCKET)) || nextBucket(true)) { // Find a bucket with space in it for a record.
880
uint32_t size = iCurrentBucket->getSize();
881
uint32_t end_of_records = iCurrentBucket->getEndOfRecords();
882
883
if (size == end_of_records) { // No holes in the recored list
884
iCurrentRec = end_of_records;
885
} else { // Search for the empty record
886
iCurrentRec = end_of_records -2;
887
while (iCurrentRec && !CS_IS_NULL_DISK_4(iBucket[iCurrentRec].ar_repo_id_4))
888
iCurrentRec--;
889
890
ASSERT(CS_IS_NULL_DISK_4(iBucket[iCurrentRec].ar_repo_id_4));
891
}
892
893
memcpy(&iBucket[iCurrentRec], new_rec, sizeof(MSDiskAliasRec)); // Add the record to the cached bucket.
894
895
iCurrentBucket->recAdded(iFile, iCurrentRec); // update the current bucket header.
896
} else { // A new bucket must be added to the chain.
897
MSADiskBucketHeadRec new_bucket = {0};
898
CSDiskValue8 disk_8_value;
899
uint64_t new_bucket_offset;
900
MSABucketInfo *next, *prev;
901
902
next = iBucketChain->getFront();
903
prev = iBucketChain->getBack();
904
905
// Set the next and prev bucket offsets in the new bucket record.
906
CS_SET_DISK_8(new_bucket.ab_prev_bucket_8, prev->bi_bucket_offset);
907
CS_SET_DISK_8(new_bucket.ab_next_bucket_8, next->bi_bucket_offset);
908
909
if (ba_share->msa_empty_buckets.getSize()) { // Get a bucket from the empty bucket list.
910
MSABucketInfo *empty_bucket = ba_share->msa_empty_buckets.removeFront();
911
912
new_bucket_offset = empty_bucket->bi_bucket_offset;
913
empty_bucket->release();
914
915
// Update the index file's empty bucket list
916
if (ba_share->msa_empty_buckets.getSize() == 0)
917
CS_SET_NULL_DISK_8(disk_8_value);
918
else
919
CS_SET_DISK_8(disk_8_value, iBucketChain->getFront()->bi_bucket_offset);
920
921
iFile->write(&disk_8_value, offsetof(MSAliasHeadRec,ah_free_list_8) , 8);
922
} else // There are no empty buckets so grow the file.
923
new_bucket_offset = ba_share->msa_fileSize;
924
925
// Write the new bucket's record header to the file
926
iFile->write(&new_bucket, new_bucket_offset, sizeof(MSADiskBucketHeadRec));
927
928
// Insert the new bucket into the bucket chain on the disk.
929
CS_SET_DISK_8(disk_8_value, new_bucket_offset);
930
iFile->write(&disk_8_value, prev->bi_bucket_offset + offsetof(MSADiskBucketHeadRec,ab_next_bucket_8), 8);
931
iFile->write(&disk_8_value, next->bi_bucket_offset + offsetof(MSADiskBucketHeadRec,ab_prev_bucket_8), 8);
932
933
// Update the file size in the file header if required
934
if (ba_share->msa_fileSize == new_bucket_offset) {
935
ba_share->msa_fileSize += sizeof(MSADiskBucketRec); // Note this is MSADiskBucketRec not MSADiskBucketHeadRec
936
937
CS_SET_DISK_8(disk_8_value, ba_share->msa_fileSize);
938
iFile->write(&disk_8_value, offsetof(MSAliasHeadRec,ah_file_size_8) , 8);
939
}
940
941
// Add the info rec into the bucket chain in RAM.
942
iCurrentBucket = MSABucketInfo::newMSABucketInfo(new_bucket_offset, 1, 0);
943
iBucketChain->addFront(iCurrentBucket);
944
iCurrentRec = 0;
945
}
946
947
uint64_t offset;
948
offset = iCurrentBucket->bi_records_offset + iCurrentRec * sizeof(MSDiskAliasRec);
949
950
// Write the new index entry to the index file.
951
iFile->write(new_rec, offset, sizeof(MSDiskAliasRec));
952
953
unlock_(&ba_share->msa_writeLock);
954
955
exit_();
956
}
957
//------------------------
958
void MSAliasFile::deleteCurrentRec()
959
{
960
MSDiskAliasPtr rec = &(iBucket[iCurrentRec]);
961
uint64_t offset;
962
enter_();
963
964
CS_SET_NULL_DISK_4(rec->ar_repo_id_4);
965
offset = iCurrentBucket->bi_records_offset + iCurrentRec * sizeof(MSDiskAliasRec);
966
967
lock_(&ba_share->msa_writeLock);
968
969
// Update the index file. It is assumed that repo_id is the first 4 bytes of 'rec'.
970
iFile->write(rec, offset, 4);
971
972
iCurrentBucket->recRemoved(iFile, iCurrentRec, iBucket);
973
974
unlock_(&ba_share->msa_writeLock);
975
976
exit_();
977
}
978
979
//------------------------
980
void MSAliasFile::updateCurrentRec(MSDiskAliasPtr update_rec)
981
{
982
uint64_t offset;
983
enter_();
984
985
// ASSERT that the updated rec still belongs to this bucket chain.
986
ASSERT(ba_share->getBucketChain(CS_GET_DISK_4(update_rec->ar_hash_4)) == iBucketChain);
987
ASSERT(!CS_IS_NULL_DISK_4(iBucket[iCurrentRec].ar_repo_id_4)); // We should not be updating a deleted record.
988
989
lock_(&ba_share->msa_writeLock);
990
offset = iCurrentBucket->bi_records_offset + iCurrentRec * sizeof(MSDiskAliasRec);
991
992
// Update the record on disk.
993
iFile->write(update_rec, offset, sizeof(MSDiskAliasRec));
994
995
// Update the record in memory.
996
CS_COPY_DISK_4(iBucket[iCurrentRec].ar_repo_id_4, update_rec->ar_repo_id_4);
997
CS_COPY_DISK_8(iBucket[iCurrentRec].ar_offset_8, update_rec->ar_offset_8);
998
999
unlock_(&ba_share->msa_writeLock);
1000
exit_();
1001
}
1002
1003
1004
//------------------------
1005
MSABucketInfo *MSABucketInfo::newMSABucketInfo(uint64_t offset, uint32_t num, uint32_t last)
1006
{
1007
MSABucketInfo *bucket;
1008
new_(bucket, MSABucketInfo(offset, num, last));
1009
return bucket;
1010
}
1011
//------------------------
1012
void MSABucketInfo::recRemoved(CSFile *iFile, uint32_t idx, MSDiskAliasRec bucket[])
1013
{
1014
MSADiskBucketHeadRec head;
1015
enter_();
1016
1017
ASSERT(idx < bi_end_of_records);
1018
1019
bi_num_recs--;
1020
if (!bi_num_recs) {
1021
// It would be nice to remove this bucket from the
1022
// bucket list and place it on the empty list.
1023
// Before this can be done a locking method would
1024
// be needed to block anyone from reading this
1025
// bucket while it was being moved.
1026
//
1027
// I haven't done this because I have been trying
1028
// to avoid read locks.
1029
bi_end_of_records = 0;
1030
} else if ((bi_end_of_records -1) == idx) {
1031
while (idx && CS_IS_NULL_DISK_4(bucket[idx].ar_repo_id_4))
1032
idx--;
1033
1034
if ((idx ==0) && CS_IS_NULL_DISK_4(bucket[0].ar_repo_id_4))
1035
bi_end_of_records = 0;
1036
else
1037
bi_end_of_records = idx +1;
1038
1039
ASSERT(bi_end_of_records >= bi_num_recs);
1040
}
1041
1042
// Update the index file.
1043
CS_SET_DISK_4(head.ab_num_recs_4, bi_num_recs);
1044
CS_SET_DISK_4(head.ab_eor_rec_4, bi_end_of_records);
1045
iFile->write(&head.ab_num_recs_4, bi_bucket_offset + offsetof(MSADiskBucketHeadRec,ab_num_recs_4), 8);
1046
exit_();
1047
}
1048
1049
//------------------------
1050
void MSABucketInfo::recAdded(CSFile *iFile, uint32_t idx)
1051
{
1052
MSADiskBucketHeadRec head;
1053
enter_();
1054
1055
ASSERT(bi_num_recs < NUM_RECORDS_PER_BUCKET);
1056
ASSERT(idx < NUM_RECORDS_PER_BUCKET);
1057
1058
bi_num_recs++;
1059
if (idx == bi_end_of_records)
1060
bi_end_of_records++;
1061
1062
// Update the index file.
1063
CS_SET_DISK_4(head.ab_num_recs_4, bi_num_recs);
1064
CS_SET_DISK_4(head.ab_eor_rec_4, bi_end_of_records);
1065
iFile->write(&head.ab_num_recs_4, bi_bucket_offset + offsetof(MSADiskBucketHeadRec,ab_num_recs_4), 8);
1066
exit_();
1067
}
1068
1069
//////////////////////////////////
1070
MSAliasFile *MSAliasFileShare::getPoolFile()
1071
{
1072
MSAliasFile *af;
1073
enter_();
1074
1075
lock_(&msa_poolLock);
1076
if ((af = msa_pool)) {
1077
msa_pool = af->ba_nextFile;
1078
} else {
1079
new_(af, MSAliasFile(this));
1080
msa_poolFiles.addFront(af);
1081
}
1082
unlock_(&msa_poolLock);
1083
1084
af->ba_nextFile = NULL;
1085
ASSERT(!af->ba_isFileInUse);
1086
af->ba_isFileInUse = true;
1087
af->retain();
1088
1089
return_(af);
1090
}
1091
#endif // HAVE_ALIAS_SUPPORT
1092
Loggerhead is a web-based interface for Breezy
Version: 2.0.1