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
|
/*
Trivial Database: human-readable summary code
Copyright (C) Rusty Russell 2010
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "tdb1_private.h"
#define SUMMARY_FORMAT1 \
"Size of file/data: %u/%zu\n" \
"Number of records: %zu\n" \
"Smallest/average/largest keys: %zu/%zu/%zu\n" \
"Smallest/average/largest data: %zu/%zu/%zu\n" \
"Smallest/average/largest padding: %zu/%zu/%zu\n" \
"Number of dead records: %zu\n" \
"Smallest/average/largest dead records: %zu/%zu/%zu\n" \
"Number of free records: %zu\n" \
"Smallest/average/largest free records: %zu/%zu/%zu\n" \
"Number of hash chains: %zu\n" \
"Smallest/average/largest hash chains: %zu/%zu/%zu\n" \
"Number of uncoalesced records: %zu\n" \
"Smallest/average/largest uncoalesced runs: %zu/%zu/%zu\n" \
"Percentage keys/data/padding/free/dead/rechdrs&tailers/hashes: %.0f/%.0f/%.0f/%.0f/%.0f/%.0f/%.0f\n"
/* We don't use tally module, to keep upstream happy. */
struct tally {
size_t min, max, total;
size_t num;
};
static void tally1_init(struct tally *tally)
{
tally->total = 0;
tally->num = 0;
tally->min = tally->max = 0;
}
static void tally1_add(struct tally *tally, size_t len)
{
if (tally->num == 0)
tally->max = tally->min = len;
else if (len > tally->max)
tally->max = len;
else if (len < tally->min)
tally->min = len;
tally->num++;
tally->total += len;
}
static size_t tally1_mean(const struct tally *tally)
{
if (!tally->num)
return 0;
return tally->total / tally->num;
}
static size_t get_hash_length(struct tdb_context *tdb, unsigned int i)
{
tdb1_off_t rec_ptr;
size_t count = 0;
if (tdb1_ofs_read(tdb, TDB1_HASH_TOP(i), &rec_ptr) == -1)
return 0;
/* keep looking until we find the right record */
while (rec_ptr) {
struct tdb1_record r;
++count;
if (tdb1_rec_read(tdb, rec_ptr, &r) == -1)
return 0;
rec_ptr = r.next;
}
return count;
}
char *tdb1_summary(struct tdb_context *tdb)
{
tdb1_off_t off, rec_off;
struct tally freet, keys, data, dead, extra, hash, uncoal;
struct tdb1_record rec;
char *ret = NULL;
bool locked;
size_t len, unc = 0;
struct tdb1_record recovery;
/* We may have a write lock already, so don't lock. */
if (tdb->file->allrecord_lock.count != 0) {
locked = false;
} else {
if (tdb_lockall_read(tdb) != TDB_SUCCESS)
return NULL;
locked = true;
}
if (tdb1_recovery_area(tdb, tdb->tdb1.io, &rec_off, &recovery) != 0) {
goto unlock;
}
tally1_init(&freet);
tally1_init(&keys);
tally1_init(&data);
tally1_init(&dead);
tally1_init(&extra);
tally1_init(&hash);
tally1_init(&uncoal);
for (off = TDB1_DATA_START(tdb->tdb1.header.hash_size);
off < tdb->file->map_size - 1;
off += sizeof(rec) + rec.rec_len) {
if (tdb->tdb1.io->tdb1_read(tdb, off, &rec, sizeof(rec),
TDB1_DOCONV()) == -1)
goto unlock;
switch (rec.magic) {
case TDB1_MAGIC:
tally1_add(&keys, rec.key_len);
tally1_add(&data, rec.data_len);
tally1_add(&extra, rec.rec_len - (rec.key_len
+ rec.data_len));
if (unc > 1)
tally1_add(&uncoal, unc - 1);
unc = 0;
break;
case TDB1_FREE_MAGIC:
tally1_add(&freet, rec.rec_len);
unc++;
break;
/* If we crash after ftruncate, we can get zeroes or fill. */
case TDB1_RECOVERY_INVALID_MAGIC:
case 0x42424242:
unc++;
/* If it's a valid recovery, we can trust rec_len. */
if (off != rec_off) {
rec.rec_len = tdb1_dead_space(tdb, off)
- sizeof(rec);
}
/* Fall through */
case TDB1_DEAD_MAGIC:
tally1_add(&dead, rec.rec_len);
break;
default:
tdb->last_error = tdb_logerr(tdb, TDB_ERR_CORRUPT,
TDB_LOG_ERROR,
"Unexpected record magic 0x%x"
" at offset %d",
rec.magic, off);
goto unlock;
}
}
if (unc > 1)
tally1_add(&uncoal, unc - 1);
for (off = 0; off < tdb->tdb1.header.hash_size; off++)
tally1_add(&hash, get_hash_length(tdb, off));
/* 20 is max length of a %zu. */
len = strlen(SUMMARY_FORMAT1) + 35*20 + 1;
ret = (char *)malloc(len);
if (!ret)
goto unlock;
snprintf(ret, len, SUMMARY_FORMAT1,
(tdb1_len_t)tdb->file->map_size, keys.total+data.total,
keys.num,
keys.min, tally1_mean(&keys), keys.max,
data.min, tally1_mean(&data), data.max,
extra.min, tally1_mean(&extra), extra.max,
dead.num,
dead.min, tally1_mean(&dead), dead.max,
freet.num,
freet.min, tally1_mean(&freet), freet.max,
hash.num,
hash.min, tally1_mean(&hash), hash.max,
uncoal.total,
uncoal.min, tally1_mean(&uncoal), uncoal.max,
keys.total * 100.0 / tdb->file->map_size,
data.total * 100.0 / tdb->file->map_size,
extra.total * 100.0 / tdb->file->map_size,
freet.total * 100.0 / tdb->file->map_size,
dead.total * 100.0 / tdb->file->map_size,
(keys.num + freet.num + dead.num)
* (sizeof(struct tdb1_record) + sizeof(uint32_t))
* 100.0 / tdb->file->map_size,
tdb->tdb1.header.hash_size * sizeof(tdb1_off_t)
* 100.0 / (tdb1_len_t)tdb->file->map_size);
unlock:
if (locked) {
tdb_unlockall_read(tdb);
}
return ret;
}
|
