summaryrefslogtreecommitdiff
path: root/lib/tdb2/test/run-20-growhash.c
blob: 22a88c450438b06bf94e8f29d554ea5f1e71d595 (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
#include <ccan/tdb2/tdb.c>
#include <ccan/tdb2/open.c>
#include <ccan/tdb2/free.c>
#include <ccan/tdb2/lock.c>
#include <ccan/tdb2/io.c>
#include <ccan/tdb2/hash.c>
#include <ccan/tdb2/transaction.c>
#include <ccan/tdb2/check.c>
#include <ccan/tap/tap.h>
#include "logging.h"

static uint64_t myhash(const void *key, size_t len, uint64_t seed, void *priv)
{
	return *(const uint64_t *)key;
}

static void add_bits(uint64_t *val, unsigned new, unsigned new_bits,
		     unsigned *done)
{
	*done += new_bits;
	*val |= ((uint64_t)new << (64 - *done));
}

static uint64_t make_key(unsigned topgroup, unsigned topbucket,
			 unsigned subgroup1, unsigned subbucket1,
			 unsigned subgroup2, unsigned subbucket2)
{
	uint64_t key = 0;
	unsigned done = 0;

	add_bits(&key, topgroup, TDB_TOPLEVEL_HASH_BITS - TDB_HASH_GROUP_BITS,
		 &done);
	add_bits(&key, topbucket, TDB_HASH_GROUP_BITS, &done);
	add_bits(&key, subgroup1, TDB_SUBLEVEL_HASH_BITS - TDB_HASH_GROUP_BITS,
		 &done);
	add_bits(&key, subbucket1, TDB_HASH_GROUP_BITS, &done);
	add_bits(&key, subgroup2, TDB_SUBLEVEL_HASH_BITS - TDB_HASH_GROUP_BITS,
		 &done);
	add_bits(&key, subbucket2, TDB_HASH_GROUP_BITS, &done);
	return key;
}

int main(int argc, char *argv[])
{
	unsigned int i, j;
	struct tdb_context *tdb;
	uint64_t kdata;
	struct tdb_used_record rec;
	struct tdb_data key = { (unsigned char *)&kdata, sizeof(kdata) };
	struct tdb_data dbuf = { (unsigned char *)&kdata, sizeof(kdata) };
	union tdb_attribute hattr = { .hash = { .base = { TDB_ATTRIBUTE_HASH },
						.fn = myhash } };
	int flags[] = { TDB_INTERNAL, TDB_DEFAULT, TDB_NOMMAP,
			TDB_INTERNAL|TDB_CONVERT, TDB_CONVERT,
			TDB_NOMMAP|TDB_CONVERT,
	};

	hattr.base.next = &tap_log_attr;

	plan_tests(sizeof(flags) / sizeof(flags[0])
		   * (9 + (20 + 2 * ((1 << TDB_HASH_GROUP_BITS) - 2))
		      * (1 << TDB_HASH_GROUP_BITS)) + 1);
	for (i = 0; i < sizeof(flags) / sizeof(flags[0]); i++) {
		struct hash_info h;

		tdb = tdb_open("run-04-basichash.tdb", flags[i],
			       O_RDWR|O_CREAT|O_TRUNC, 0600, &hattr);
		ok1(tdb);
		if (!tdb)
			continue;

		/* Fill a group. */
		for (j = 0; j < (1 << TDB_HASH_GROUP_BITS); j++) {
			kdata = make_key(0, j, 0, 0, 0, 0);
			ok1(tdb_store(tdb, key, dbuf, TDB_INSERT) == 0);
		}
		ok1(tdb_check(tdb, NULL, NULL) == 0);

		/* Check first still exists. */
		kdata = make_key(0, 0, 0, 0, 0, 0);
		ok1(find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL) != 0);
		/* Should have created correct hash. */
		ok1(h.h == tdb_hash(tdb, key.dptr, key.dsize));
		/* Should have located space in group 0, bucket 0. */
		ok1(h.group_start == offsetof(struct tdb_header, hashtable));
		ok1(h.home_bucket == 0);
		ok1(h.found_bucket == 0);
		ok1(h.hash_used == TDB_TOPLEVEL_HASH_BITS);
		/* Entire group should be full! */
		for (j = 0; j < (1 << TDB_HASH_GROUP_BITS); j++)
			ok1(h.group[j] != 0);

		ok1(tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range,
				      F_RDLCK) == 0);

		/* Now, add one more to each should expand (that) bucket. */
		for (j = 0; j < (1 << TDB_HASH_GROUP_BITS); j++) {
			unsigned int k;
			kdata = make_key(0, j, 0, 1, 0, 0);
			ok1(tdb_store(tdb, key, dbuf, TDB_INSERT) == 0);
			ok1(tdb_check(tdb, NULL, NULL) == 0);

			ok1(find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL));
			/* Should have created correct hash. */
			ok1(h.h == tdb_hash(tdb, key.dptr, key.dsize));
			/* Should have moved to subhash */
			ok1(h.group_start >= sizeof(struct tdb_header));
			ok1(h.home_bucket == 1);
			ok1(h.found_bucket == 1);
			ok1(h.hash_used == TDB_TOPLEVEL_HASH_BITS
			    + TDB_SUBLEVEL_HASH_BITS);
			ok1(tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range,
					      F_RDLCK) == 0);

			/* Keep adding, make it expand again. */
			for (k = 2; k < (1 << TDB_HASH_GROUP_BITS); k++) {
				kdata = make_key(0, j, 0, k, 0, 0);
				ok1(tdb_store(tdb, key, dbuf, TDB_INSERT) == 0);
				ok1(tdb_check(tdb, NULL, NULL) == 0);
			}

			/* This should tip it over to sub-sub-hash. */
			kdata = make_key(0, j, 0, 0, 0, 1);
			ok1(tdb_store(tdb, key, dbuf, TDB_INSERT) == 0);
			ok1(tdb_check(tdb, NULL, NULL) == 0);

			ok1(find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL));
			/* Should have created correct hash. */
			ok1(h.h == tdb_hash(tdb, key.dptr, key.dsize));
			/* Should have moved to subhash */
			ok1(h.group_start >= sizeof(struct tdb_header));
			ok1(h.home_bucket == 1);
			ok1(h.found_bucket == 1);
			ok1(h.hash_used == TDB_TOPLEVEL_HASH_BITS
			    + TDB_SUBLEVEL_HASH_BITS + TDB_SUBLEVEL_HASH_BITS);
			ok1(tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range,
					      F_RDLCK) == 0);
		}
		tdb_close(tdb);
	}

	ok1(tap_log_messages == 0);
	return exit_status();
}