summaryrefslogtreecommitdiffstats
path: root/libglusterfs/src/rbthash.c
blob: 52d8a15fd2c185008261cc871c2d6e10decdadf6 (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
/*
  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
  This file is part of GlusterFS.

  This file is licensed to you under your choice of the GNU Lesser
  General Public License, version 3 or any later version (LGPLv3 or
  later), or the GNU General Public License, version 2 (GPLv2), in all
  cases as published by the Free Software Foundation.
*/


#include "rbthash.h"
#include "rb.h"
#include "locking.h"
#include "mem-pool.h"
#include "logging.h"
#include "libglusterfs-messages.h"

#include <pthread.h>
#include <string.h>


int
rbthash_comparator (void *entry1, void *entry2, void *param)
{
        int             ret = 0;
        rbthash_entry_t *e1 = NULL;
        rbthash_entry_t *e2 = NULL;

        if ((!entry1) || (!entry2) || (!param))
                return -1;

        e1 = (rbthash_entry_t *)entry1;
        e2 = (rbthash_entry_t *)entry2;

        if (e1->keylen != e2->keylen) {
                if (e1->keylen < e2->keylen)
                        ret = -1;
                else if (e1->keylen > e2->keylen)
                        ret = 1;
        } else
                ret = memcmp (e1->key, e2->key, e1->keylen);

        return ret;
}


int
__rbthash_init_buckets (rbthash_table_t *tbl, int buckets)
{
        int     i = 0;
        int     ret = -1;

        if (!tbl)
                return -1;

        for (; i < buckets; i++) {
                LOCK_INIT (&tbl->buckets[i].bucketlock);
                tbl->buckets[i].bucket = rb_create ((rb_comparison_func *)rbthash_comparator, tbl, NULL);
                if (!tbl->buckets[i].bucket) {
                        gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0,
                                LG_MSG_RB_TABLE_CREATE_FAILED, "Failed to "
                                "create rb table bucket");
                        ret = -1;
                        goto err;
                }
        }

        ret = 0;
err:
        return ret;
}


/*
 * rbthash_table_init - Initialize a RBT based hash table
 * @buckets - Number of buckets in the hash table
 * @hfunc   - hashing function
 * @dfunc   - destroyer for data in the RBT
 * @expected_entries - Number of entries expected in RBT. Mutually exclusive
 * with entrypool.
 * @entrypool -  Memory pool in lieu of expected_entries.
 */

rbthash_table_t *
rbthash_table_init (int buckets, rbt_hasher_t hfunc,
                    rbt_data_destroyer_t dfunc,
                    unsigned long expected_entries,
                    struct mem_pool *entrypool)
{
        rbthash_table_t         *newtab = NULL;
        int                     ret = -1;

        if (!hfunc) {
                gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0, LG_MSG_HASH_FUNC_ERROR,
                        "Hash function not given");
                return NULL;
        }

        if (!entrypool && !expected_entries) {
                gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0, LG_MSG_INVALID_ENTRY,
                        "Both mem-pool and expected entries not provided");
                return NULL;
        }

        if (entrypool && expected_entries) {
                gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0, LG_MSG_INVALID_ENTRY,
                        "Both mem-pool and expected entries are provided");
                return NULL;
        }


        newtab = GF_CALLOC (1, sizeof (*newtab),
                            gf_common_mt_rbthash_table_t);
        if (!newtab)
                return NULL;

        newtab->buckets = GF_CALLOC (buckets, sizeof (struct rbthash_bucket),
                                     gf_common_mt_rbthash_bucket);
        if (!newtab->buckets) {
                goto free_newtab;
        }

        if (expected_entries) {
                newtab->entrypool =
                        mem_pool_new (rbthash_entry_t, expected_entries);
                if (!newtab->entrypool) {
                        goto free_buckets;
                }
                newtab->pool_alloced = _gf_true;
        } else {
                newtab->entrypool = entrypool;
        }

        LOCK_INIT (&newtab->tablelock);
        INIT_LIST_HEAD (&newtab->list);
        newtab->numbuckets = buckets;
        ret = __rbthash_init_buckets (newtab, buckets);

        if (ret == -1) {
                gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0,
                        LG_MSG_RBTHASH_INIT_BUCKET_FAILED,
                        "Failed to init buckets");
                if (newtab->pool_alloced)
                        mem_pool_destroy (newtab->entrypool);
        } else {
                gf_msg_trace (GF_RBTHASH, 0, "Inited hash table: buckets:"
                        " %d", buckets);
        }

        newtab->hashfunc = hfunc;
        newtab->dfunc = dfunc;

free_buckets:
        if (ret == -1)
                GF_FREE (newtab->buckets);

free_newtab:
        if (ret == -1) {
                GF_FREE (newtab);
                newtab = NULL;
        }

        return newtab;
}

rbthash_entry_t *
rbthash_init_entry (rbthash_table_t *tbl, void *data, void *key, int keylen)
{
        int             ret = -1;
        rbthash_entry_t *entry = NULL;

        if ((!tbl) || (!data) || (!key))
                return NULL;

        entry = mem_get (tbl->entrypool);
        if (!entry) {
                gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0,
                        LG_MSG_RBTHASH_GET_ENTRY_FAILED,
                        "Failed to get entry from mem-pool");
                goto ret;
        }

        entry->data = data;
        entry->key = GF_CALLOC (keylen, sizeof (char), gf_common_mt_char);
        if (!entry->key) {
                goto free_entry;
        }

        INIT_LIST_HEAD (&entry->list);
        memcpy (entry->key, key, keylen);
        entry->keylen = keylen;
        entry->keyhash = tbl->hashfunc (entry->key, entry->keylen);
        gf_msg_trace (GF_RBTHASH, 0, "HASH: %u", entry->keyhash);

        ret = 0;
free_entry:
        if (ret == -1) {
                mem_put (entry);
                entry = NULL;
        }

ret:
        return entry;
}


void
rbthash_deinit_entry (rbthash_table_t *tbl, rbthash_entry_t *entry)
{

        if (!entry)
                return;

        GF_FREE (entry->key);

        if (tbl) {
                if ((entry->data) && (tbl->dfunc))
                        tbl->dfunc (entry->data);

                LOCK (&tbl->tablelock);
                {
                        list_del_init (&entry->list);
                }
                UNLOCK (&tbl->tablelock);

                mem_put (entry);
        }

        return;
}


static struct rbthash_bucket *
rbthash_entry_bucket (rbthash_table_t *tbl, rbthash_entry_t * entry)
{
        int     nbucket = 0;

        nbucket = (entry->keyhash % tbl->numbuckets);
        gf_msg_trace (GF_RBTHASH, 0, "BUCKET: %d", nbucket);
        return &tbl->buckets[nbucket];
}


int
rbthash_insert_entry (rbthash_table_t *tbl, rbthash_entry_t *entry)
{
        struct rbthash_bucket   *bucket = NULL;
        int                     ret = -1;

        if ((!tbl) || (!entry))
                return -1;

        bucket = rbthash_entry_bucket (tbl, entry);
        if (!bucket) {
                gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0,
                        LG_MSG_RBTHASH_GET_BUCKET_FAILED,
                        "Failed to get bucket");
                goto err;
        }

        ret = 0;
        LOCK (&bucket->bucketlock);
        {
                if (!rb_probe (bucket->bucket, (void *)entry)) {
                        gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0,
                                LG_MSG_RBTHASH_INSERT_FAILED, "Failed to insert"
                                " entry");
                        ret = -1;
                }
        }
        UNLOCK (&bucket->bucketlock);

err:
        return ret;
}


int
rbthash_insert (rbthash_table_t *tbl, void *data, void *key, int keylen)
{
        rbthash_entry_t         *entry = NULL;
        int                     ret = -1;

        if ((!tbl) || (!data) || (!key))
                return -1;

        entry = rbthash_init_entry (tbl, data, key, keylen);
        if (!entry) {
                gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0,
                        LG_MSG_RBTHASH_INIT_ENTRY_FAILED,
                        "Failed to init entry");
                goto err;
        }

        ret = rbthash_insert_entry (tbl, entry);

        if (ret == -1) {
                gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0,
                        LG_MSG_RBTHASH_INSERT_FAILED,
                        "Failed to insert entry");
                rbthash_deinit_entry (tbl, entry);
        }

        LOCK (&tbl->tablelock);
        {
                list_add_tail (&entry->list, &tbl->list);
        }
        UNLOCK (&tbl->tablelock);

err:
        return ret;
}

static struct rbthash_bucket *
rbthash_key_bucket (rbthash_table_t *tbl, void *key, int keylen)
{
        uint32_t        keyhash = 0;
        int             nbucket = 0;

        if ((!tbl) || (!key))
                return NULL;

        keyhash =  tbl->hashfunc (key, keylen);
        gf_msg_trace (GF_RBTHASH, 0, "HASH: %u", keyhash);
        nbucket = (keyhash % tbl->numbuckets);
        gf_msg_trace (GF_RBTHASH, 0, "BUCKET: %u", nbucket);

        return &tbl->buckets[nbucket];
}


void *
rbthash_get (rbthash_table_t *tbl, void *key, int keylen)
{
        struct rbthash_bucket           *bucket = NULL;
        rbthash_entry_t                 *entry = NULL;
        rbthash_entry_t                 searchentry = {0, };

        if ((!tbl) || (!key))
                return NULL;

        bucket = rbthash_key_bucket (tbl, key, keylen);
        if (!bucket) {
                gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0, LG_MSG_GET_BUCKET_FAILED,
                        "Failed to get bucket");
                return NULL;
        }

        searchentry.key = key;
        searchentry.keylen = keylen;
        LOCK (&bucket->bucketlock);
        {
                entry = rb_find (bucket->bucket, &searchentry);
        }
        UNLOCK (&bucket->bucketlock);

        if (!entry)
                return NULL;

        return entry->data;
}


void *
rbthash_remove (rbthash_table_t *tbl, void *key, int keylen)
{
        struct rbthash_bucket   *bucket = NULL;
        rbthash_entry_t         *entry = NULL;
        rbthash_entry_t         searchentry = {0, };
        void                    *dataref = NULL;

        if ((!tbl) || (!key))
                return NULL;

        bucket = rbthash_key_bucket (tbl, key, keylen);
        if (!bucket) {
                gf_msg (GF_RBTHASH, GF_LOG_ERROR, 0,
                        LG_MSG_RBTHASH_GET_BUCKET_FAILED,
                        "Failed to get bucket");
                return NULL;
        }

        searchentry.key = key;
        searchentry.keylen = keylen;

        LOCK (&bucket->bucketlock);
        {
                entry = rb_delete (bucket->bucket, &searchentry);
        }
        UNLOCK (&bucket->bucketlock);

        if (!entry)
                return NULL;

        GF_FREE (entry->key);
        dataref = entry->data;

        LOCK (&tbl->tablelock);
        {
                list_del_init (&entry->list);
        }
        UNLOCK (&tbl->tablelock);

        mem_put (entry);

        return dataref;
}


void
rbthash_entry_deiniter (void *entry, void *rbparam)
{
        if (!entry)
                return;

        rbthash_deinit_entry (rbparam, entry);
}


void
rbthash_table_destroy_buckets (rbthash_table_t *tbl)
{
        int x = 0;
        if (!tbl)
                return;

        for (;x < tbl->numbuckets; x++) {
                LOCK_DESTROY (&tbl->buckets[x].bucketlock);
                rb_destroy (tbl->buckets[x].bucket, rbthash_entry_deiniter);
        }

        return;
}


void
rbthash_table_destroy (rbthash_table_t *tbl)
{
        if (!tbl)
                return;

        rbthash_table_destroy_buckets (tbl);
        if (tbl->pool_alloced)
                mem_pool_destroy (tbl->entrypool);

        GF_FREE (tbl->buckets);
        GF_FREE (tbl);
}


void
rbthash_table_traverse (rbthash_table_t *tbl, rbt_traverse_t traverse,
                        void *mydata)
{
        rbthash_entry_t *entry = NULL;

        if ((tbl == NULL) || (traverse == NULL)) {
                goto out;
        }

        LOCK (&tbl->tablelock);
        {
                list_for_each_entry (entry, &tbl->list, list) {
                        traverse (entry->data, mydata);
                }
        }
        UNLOCK (&tbl->tablelock);

out:
        return;
}