+++ /dev/null
- /*
- 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 "tdb_private.h"
-
-#define SUMMARY_FORMAT \
- "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 tally_init(struct tally *tally)
-{
- tally->total = 0;
- tally->num = 0;
- tally->min = tally->max = 0;
-}
-
-static void tally_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 tally_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)
-{
- tdb_off_t rec_ptr;
- size_t count = 0;
-
- if (tdb_ofs_read(tdb, TDB_HASH_TOP(i), &rec_ptr) == -1)
- return 0;
-
- /* keep looking until we find the right record */
- while (rec_ptr) {
- struct tdb_record r;
- ++count;
- if (tdb_rec_read(tdb, rec_ptr, &r) == -1)
- return 0;
- rec_ptr = r.next;
- }
- return count;
-}
-
-char *tdb_summary(struct tdb_context *tdb)
-{
- tdb_off_t off;
- struct tally freet, keys, data, dead, extra, hash, uncoal;
- struct tdb_record rec;
- char *ret = NULL;
- bool locked;
- size_t len, unc = 0;
-
- /* Read-only databases use no locking at all: it's best-effort.
- * We may have a write lock already, so skip that case too. */
- if (tdb->read_only || tdb->allrecord_lock.count != 0) {
- locked = false;
- } else {
- if (tdb_lockall_read(tdb) == -1)
- return NULL;
- locked = true;
- }
-
- tally_init(&freet);
- tally_init(&keys);
- tally_init(&data);
- tally_init(&dead);
- tally_init(&extra);
- tally_init(&hash);
- tally_init(&uncoal);
-
- for (off = TDB_DATA_START(tdb->header.hash_size);
- off < tdb->map_size - 1;
- off += sizeof(rec) + rec.rec_len) {
- if (tdb->methods->tdb_read(tdb, off, &rec, sizeof(rec),
- DOCONV()) == -1)
- goto unlock;
- switch (rec.magic) {
- case TDB_MAGIC:
- tally_add(&keys, rec.key_len);
- tally_add(&data, rec.data_len);
- tally_add(&extra, rec.rec_len - (rec.key_len
- + rec.data_len));
- if (unc > 1)
- tally_add(&uncoal, unc - 1);
- unc = 0;
- break;
- case TDB_FREE_MAGIC:
- tally_add(&freet, rec.rec_len);
- unc++;
- break;
- /* If we crash after ftruncate, we can get zeroes or fill. */
- case TDB_RECOVERY_INVALID_MAGIC:
- case 0x42424242:
- unc++;
- rec.rec_len = tdb_dead_space(tdb, off) - sizeof(rec);
- /* Fall through */
- case TDB_DEAD_MAGIC:
- tally_add(&dead, rec.rec_len);
- break;
- default:
- TDB_LOG((tdb, TDB_DEBUG_ERROR,
- "Unexpected record magic 0x%x at offset %d\n",
- rec.magic, off));
- goto unlock;
- }
- }
- if (unc > 1)
- tally_add(&uncoal, unc - 1);
-
- for (off = 0; off < tdb->header.hash_size; off++)
- tally_add(&hash, get_hash_length(tdb, off));
-
- /* 20 is max length of a %zu. */
- len = strlen(SUMMARY_FORMAT) + 35*20 + 1;
- ret = malloc(len);
- if (!ret)
- goto unlock;
-
- sprintf(ret, SUMMARY_FORMAT,
- tdb->map_size, keys.total+data.total,
- keys.num,
- keys.min, tally_mean(&keys), keys.max,
- data.min, tally_mean(&data), data.max,
- extra.min, tally_mean(&extra), extra.max,
- dead.num,
- dead.min, tally_mean(&dead), dead.max,
- freet.num,
- freet.min, tally_mean(&freet), freet.max,
- hash.num,
- hash.min, tally_mean(&hash), hash.max,
- uncoal.total,
- uncoal.min, tally_mean(&uncoal), uncoal.max,
- keys.total * 100.0 / tdb->map_size,
- data.total * 100.0 / tdb->map_size,
- extra.total * 100.0 / tdb->map_size,
- freet.total * 100.0 / tdb->map_size,
- dead.total * 100.0 / tdb->map_size,
- (keys.num + freet.num + dead.num)
- * (sizeof(struct tdb_record) + sizeof(uint32_t))
- * 100.0 / tdb->map_size,
- tdb->header.hash_size * sizeof(tdb_off_t)
- * 100.0 / tdb->map_size);
-
-unlock:
- if (locked) {
- tdb_unlockall_read(tdb);
- }
- return ret;
-}
projects / ccan / blobdiff