+++ /dev/null
- /*
- Trivial Database 2: free list/block handling
- 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 "private.h"
-#include <ccan/likely/likely.h>
-#include <ccan/asearch/asearch.h>
-
-/* We keep an ordered array of offsets. */
-static bool append(tdb_off_t **arr, size_t *num, tdb_off_t off)
-{
- tdb_off_t *new = realloc(*arr, (*num + 1) * sizeof(tdb_off_t));
- if (!new)
- return false;
- new[(*num)++] = off;
- *arr = new;
- return true;
-}
-
-static enum TDB_ERROR check_header(struct tdb_context *tdb, tdb_off_t *recovery,
- uint64_t *features, size_t *num_capabilities)
-{
- uint64_t hash_test;
- struct tdb_header hdr;
- enum TDB_ERROR ecode;
- tdb_off_t off, next;
-
- ecode = tdb_read_convert(tdb, 0, &hdr, sizeof(hdr));
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
- /* magic food should not be converted, so convert back. */
- tdb_convert(tdb, hdr.magic_food, sizeof(hdr.magic_food));
-
- hash_test = TDB_HASH_MAGIC;
- hash_test = tdb_hash(tdb, &hash_test, sizeof(hash_test));
- if (hdr.hash_test != hash_test) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "check: hash test %llu should be %llu",
- (long long)hdr.hash_test,
- (long long)hash_test);
- }
-
- if (strcmp(hdr.magic_food, TDB_MAGIC_FOOD) != 0) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "check: bad magic '%.*s'",
- (unsigned)sizeof(hdr.magic_food),
- hdr.magic_food);
- }
-
- /* Features which are used must be a subset of features offered. */
- if (hdr.features_used & ~hdr.features_offered) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "check: features used (0x%llx) which"
- " are not offered (0x%llx)",
- (long long)hdr.features_used,
- (long long)hdr.features_offered);
- }
-
- *features = hdr.features_offered;
- *recovery = hdr.recovery;
- if (*recovery) {
- if (*recovery < sizeof(hdr)
- || *recovery > tdb->file->map_size) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check:"
- " invalid recovery offset %zu",
- (size_t)*recovery);
- }
- }
-
- for (off = hdr.capabilities; off && ecode == TDB_SUCCESS; off = next) {
- const struct tdb_capability *cap;
- enum TDB_ERROR err;
-
- cap = tdb_access_read(tdb, off, sizeof(*cap), true);
- if (TDB_PTR_IS_ERR(cap)) {
- return TDB_PTR_ERR(cap);
- }
-
- /* All capabilities are unknown. */
- err = unknown_capability(tdb, "tdb_check", cap->type);
- next = cap->next;
- tdb_access_release(tdb, cap);
- if (err)
- return err;
- (*num_capabilities)++;
- }
-
- /* Don't check reserved: they *can* be used later. */
- return TDB_SUCCESS;
-}
-
-static enum TDB_ERROR check_hash_tree(struct tdb_context *tdb,
- tdb_off_t off, unsigned int group_bits,
- uint64_t hprefix,
- unsigned hprefix_bits,
- tdb_off_t used[],
- size_t num_used,
- size_t *num_found,
- enum TDB_ERROR (*check)(TDB_DATA,
- TDB_DATA, void *),
- void *data);
-
-static enum TDB_ERROR check_hash_chain(struct tdb_context *tdb,
- tdb_off_t off,
- uint64_t hash,
- tdb_off_t used[],
- size_t num_used,
- size_t *num_found,
- enum TDB_ERROR (*check)(TDB_DATA,
- TDB_DATA,
- void *),
- void *data)
-{
- struct tdb_used_record rec;
- enum TDB_ERROR ecode;
-
- ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec));
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
-
- if (rec_magic(&rec) != TDB_CHAIN_MAGIC) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: Bad hash chain magic %llu",
- (long long)rec_magic(&rec));
- }
-
- if (rec_data_length(&rec) != sizeof(struct tdb_chain)) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check:"
- " Bad hash chain length %llu vs %zu",
- (long long)rec_data_length(&rec),
- sizeof(struct tdb_chain));
- }
- if (rec_key_length(&rec) != 0) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: Bad hash chain key length %llu",
- (long long)rec_key_length(&rec));
- }
- if (rec_hash(&rec) != 0) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: Bad hash chain hash value %llu",
- (long long)rec_hash(&rec));
- }
-
- off += sizeof(rec);
- ecode = check_hash_tree(tdb, off, 0, hash, 64,
- used, num_used, num_found, check, data);
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
-
- off = tdb_read_off(tdb, off + offsetof(struct tdb_chain, next));
- if (TDB_OFF_IS_ERR(off)) {
- return TDB_OFF_TO_ERR(off);
- }
- if (off == 0)
- return TDB_SUCCESS;
- (*num_found)++;
- return check_hash_chain(tdb, off, hash, used, num_used, num_found,
- check, data);
-}
-
-static enum TDB_ERROR check_hash_record(struct tdb_context *tdb,
- tdb_off_t off,
- uint64_t hprefix,
- unsigned hprefix_bits,
- tdb_off_t used[],
- size_t num_used,
- size_t *num_found,
- enum TDB_ERROR (*check)(TDB_DATA,
- TDB_DATA,
- void *),
- void *data)
-{
- struct tdb_used_record rec;
- enum TDB_ERROR ecode;
-
- if (hprefix_bits >= 64)
- return check_hash_chain(tdb, off, hprefix, used, num_used,
- num_found, check, data);
-
- ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec));
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
-
- if (rec_magic(&rec) != TDB_HTABLE_MAGIC) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: Bad hash table magic %llu",
- (long long)rec_magic(&rec));
- }
- if (rec_data_length(&rec)
- != sizeof(tdb_off_t) << TDB_SUBLEVEL_HASH_BITS) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check:"
- " Bad hash table length %llu vs %llu",
- (long long)rec_data_length(&rec),
- (long long)sizeof(tdb_off_t)
- << TDB_SUBLEVEL_HASH_BITS);
- }
- if (rec_key_length(&rec) != 0) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: Bad hash table key length %llu",
- (long long)rec_key_length(&rec));
- }
- if (rec_hash(&rec) != 0) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: Bad hash table hash value %llu",
- (long long)rec_hash(&rec));
- }
-
- off += sizeof(rec);
- return check_hash_tree(tdb, off,
- TDB_SUBLEVEL_HASH_BITS-TDB_HASH_GROUP_BITS,
- hprefix, hprefix_bits,
- used, num_used, num_found, check, data);
-}
-
-static int off_cmp(const tdb_off_t *a, const tdb_off_t *b)
-{
- /* Can overflow an int. */
- return *a > *b ? 1
- : *a < *b ? -1
- : 0;
-}
-
-static uint64_t get_bits(uint64_t h, unsigned num, unsigned *used)
-{
- *used += num;
-
- return (h >> (64 - *used)) & ((1U << num) - 1);
-}
-
-static enum TDB_ERROR check_hash_tree(struct tdb_context *tdb,
- tdb_off_t off, unsigned int group_bits,
- uint64_t hprefix,
- unsigned hprefix_bits,
- tdb_off_t used[],
- size_t num_used,
- size_t *num_found,
- enum TDB_ERROR (*check)(TDB_DATA,
- TDB_DATA, void *),
- void *data)
-{
- unsigned int g, b;
- const tdb_off_t *hash;
- struct tdb_used_record rec;
- enum TDB_ERROR ecode;
-
- hash = tdb_access_read(tdb, off,
- sizeof(tdb_off_t)
- << (group_bits + TDB_HASH_GROUP_BITS),
- true);
- if (TDB_PTR_IS_ERR(hash)) {
- return TDB_PTR_ERR(hash);
- }
-
- for (g = 0; g < (1 << group_bits); g++) {
- const tdb_off_t *group = hash + (g << TDB_HASH_GROUP_BITS);
- for (b = 0; b < (1 << TDB_HASH_GROUP_BITS); b++) {
- unsigned int bucket, i, used_bits;
- uint64_t h;
- tdb_off_t *p;
- if (group[b] == 0)
- continue;
-
- off = group[b] & TDB_OFF_MASK;
- p = asearch(&off, used, num_used, off_cmp);
- if (!p) {
- ecode = tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: Invalid offset"
- " %llu in hash",
- (long long)off);
- goto fail;
- }
- /* Mark it invalid. */
- *p ^= 1;
- (*num_found)++;
-
- if (hprefix_bits == 64) {
- /* Chained entries are unordered. */
- if (is_subhash(group[b])) {
- ecode = TDB_ERR_CORRUPT;
- tdb_logerr(tdb, ecode,
- TDB_LOG_ERROR,
- "tdb_check: Invalid chain"
- " entry subhash");
- goto fail;
- }
- h = hash_record(tdb, off);
- if (h != hprefix) {
- ecode = TDB_ERR_CORRUPT;
- tdb_logerr(tdb, ecode,
- TDB_LOG_ERROR,
- "check: bad hash chain"
- " placement"
- " 0x%llx vs 0x%llx",
- (long long)h,
- (long long)hprefix);
- goto fail;
- }
- ecode = tdb_read_convert(tdb, off, &rec,
- sizeof(rec));
- if (ecode != TDB_SUCCESS) {
- goto fail;
- }
- goto check;
- }
-
- if (is_subhash(group[b])) {
- uint64_t subprefix;
- subprefix = (hprefix
- << (group_bits + TDB_HASH_GROUP_BITS))
- + g * (1 << TDB_HASH_GROUP_BITS) + b;
-
- ecode = check_hash_record(tdb,
- group[b] & TDB_OFF_MASK,
- subprefix,
- hprefix_bits
- + group_bits
- + TDB_HASH_GROUP_BITS,
- used, num_used, num_found,
- check, data);
- if (ecode != TDB_SUCCESS) {
- goto fail;
- }
- continue;
- }
- /* A normal entry */
-
- /* Does it belong here at all? */
- h = hash_record(tdb, off);
- used_bits = 0;
- if (get_bits(h, hprefix_bits, &used_bits) != hprefix
- && hprefix_bits) {
- ecode = tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "check: bad hash placement"
- " 0x%llx vs 0x%llx",
- (long long)h,
- (long long)hprefix);
- goto fail;
- }
-
- /* Does it belong in this group? */
- if (get_bits(h, group_bits, &used_bits) != g) {
- ecode = tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "check: bad group %llu"
- " vs %u",
- (long long)h, g);
- goto fail;
- }
-
- /* Are bucket bits correct? */
- bucket = group[b] & TDB_OFF_HASH_GROUP_MASK;
- if (get_bits(h, TDB_HASH_GROUP_BITS, &used_bits)
- != bucket) {
- used_bits -= TDB_HASH_GROUP_BITS;
- ecode = tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "check: bad bucket %u vs %u",
- (unsigned)get_bits(h,
- TDB_HASH_GROUP_BITS,
- &used_bits),
- bucket);
- goto fail;
- }
-
- /* There must not be any zero entries between
- * the bucket it belongs in and this one! */
- for (i = bucket;
- i != b;
- i = (i + 1) % (1 << TDB_HASH_GROUP_BITS)) {
- if (group[i] == 0) {
- ecode = TDB_ERR_CORRUPT;
- tdb_logerr(tdb, ecode,
- TDB_LOG_ERROR,
- "check: bad group placement"
- " %u vs %u",
- b, bucket);
- goto fail;
- }
- }
-
- ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec));
- if (ecode != TDB_SUCCESS) {
- goto fail;
- }
-
- /* Bottom bits must match header. */
- if ((h & ((1 << 11)-1)) != rec_hash(&rec)) {
- ecode = tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: Bad hash magic"
- " at offset %llu"
- " (0x%llx vs 0x%llx)",
- (long long)off,
- (long long)h,
- (long long)rec_hash(&rec));
- goto fail;
- }
-
- check:
- if (check) {
- TDB_DATA k, d;
- const unsigned char *kptr;
-
- kptr = tdb_access_read(tdb,
- off + sizeof(rec),
- rec_key_length(&rec)
- + rec_data_length(&rec),
- false);
- if (TDB_PTR_IS_ERR(kptr)) {
- ecode = TDB_PTR_ERR(kptr);
- goto fail;
- }
-
- k = tdb_mkdata(kptr, rec_key_length(&rec));
- d = tdb_mkdata(kptr + k.dsize,
- rec_data_length(&rec));
- ecode = check(k, d, data);
- tdb_access_release(tdb, kptr);
- if (ecode != TDB_SUCCESS) {
- goto fail;
- }
- }
- }
- }
- tdb_access_release(tdb, hash);
- return TDB_SUCCESS;
-
-fail:
- tdb_access_release(tdb, hash);
- return ecode;
-}
-
-static enum TDB_ERROR check_hash(struct tdb_context *tdb,
- tdb_off_t used[],
- size_t num_used, size_t num_other_used,
- enum TDB_ERROR (*check)(TDB_DATA, TDB_DATA, void *),
- void *data)
-{
- /* Free tables and capabilities also show up as used. */
- size_t num_found = num_other_used;
- enum TDB_ERROR ecode;
-
- ecode = check_hash_tree(tdb, offsetof(struct tdb_header, hashtable),
- TDB_TOPLEVEL_HASH_BITS-TDB_HASH_GROUP_BITS,
- 0, 0, used, num_used, &num_found,
- check, data);
- if (ecode == TDB_SUCCESS) {
- if (num_found != num_used) {
- ecode = tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: Not all entries"
- " are in hash");
- }
- }
- return ecode;
-}
-
-static enum TDB_ERROR check_free(struct tdb_context *tdb,
- tdb_off_t off,
- const struct tdb_free_record *frec,
- tdb_off_t prev, unsigned int ftable,
- unsigned int bucket)
-{
- enum TDB_ERROR ecode;
-
- if (frec_magic(frec) != TDB_FREE_MAGIC) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: offset %llu bad magic 0x%llx",
- (long long)off,
- (long long)frec->magic_and_prev);
- }
- if (frec_ftable(frec) != ftable) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: offset %llu bad freetable %u",
- (long long)off, frec_ftable(frec));
-
- }
-
- ecode = tdb->tdb2.io->oob(tdb, off,
- frec_len(frec)
- + sizeof(struct tdb_used_record),
- false);
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
- if (size_to_bucket(frec_len(frec)) != bucket) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: offset %llu in wrong bucket"
- " (%u vs %u)",
- (long long)off,
- bucket, size_to_bucket(frec_len(frec)));
- }
- if (prev && prev != frec_prev(frec)) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: offset %llu bad prev"
- " (%llu vs %llu)",
- (long long)off,
- (long long)prev, (long long)frec_len(frec));
- }
- return TDB_SUCCESS;
-}
-
-static enum TDB_ERROR check_free_table(struct tdb_context *tdb,
- tdb_off_t ftable_off,
- unsigned ftable_num,
- tdb_off_t fr[],
- size_t num_free,
- size_t *num_found)
-{
- struct tdb_freetable ft;
- tdb_off_t h;
- unsigned int i;
- enum TDB_ERROR ecode;
-
- ecode = tdb_read_convert(tdb, ftable_off, &ft, sizeof(ft));
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
-
- if (rec_magic(&ft.hdr) != TDB_FTABLE_MAGIC
- || rec_key_length(&ft.hdr) != 0
- || rec_data_length(&ft.hdr) != sizeof(ft) - sizeof(ft.hdr)
- || rec_hash(&ft.hdr) != 0) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: Invalid header on free table");
- }
-
- for (i = 0; i < TDB_FREE_BUCKETS; i++) {
- tdb_off_t off, prev = 0, *p, first = 0;
- struct tdb_free_record f;
-
- h = bucket_off(ftable_off, i);
- for (off = tdb_read_off(tdb, h); off; off = f.next) {
- if (TDB_OFF_IS_ERR(off)) {
- return TDB_OFF_TO_ERR(off);
- }
- if (!first) {
- off &= TDB_OFF_MASK;
- first = off;
- }
- ecode = tdb_read_convert(tdb, off, &f, sizeof(f));
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
- ecode = check_free(tdb, off, &f, prev, ftable_num, i);
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
-
- /* FIXME: Check hash bits */
- p = asearch(&off, fr, num_free, off_cmp);
- if (!p) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: Invalid offset"
- " %llu in free table",
- (long long)off);
- }
- /* Mark it invalid. */
- *p ^= 1;
- (*num_found)++;
- prev = off;
- }
-
- if (first) {
- /* Now we can check first back pointer. */
- ecode = tdb_read_convert(tdb, first, &f, sizeof(f));
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
- ecode = check_free(tdb, first, &f, prev, ftable_num, i);
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
- }
- }
- return TDB_SUCCESS;
-}
-
-/* Slow, but should be very rare. */
-tdb_off_t dead_space(struct tdb_context *tdb, tdb_off_t off)
-{
- size_t len;
- enum TDB_ERROR ecode;
-
- for (len = 0; off + len < tdb->file->map_size; len++) {
- char c;
- ecode = tdb->tdb2.io->tread(tdb, off, &c, 1);
- if (ecode != TDB_SUCCESS) {
- return TDB_ERR_TO_OFF(ecode);
- }
- if (c != 0 && c != 0x43)
- break;
- }
- return len;
-}
-
-static enum TDB_ERROR check_linear(struct tdb_context *tdb,
- tdb_off_t **used, size_t *num_used,
- tdb_off_t **fr, size_t *num_free,
- uint64_t features, tdb_off_t recovery)
-{
- tdb_off_t off;
- tdb_len_t len;
- enum TDB_ERROR ecode;
- bool found_recovery = false;
-
- for (off = sizeof(struct tdb_header);
- off < tdb->file->map_size;
- off += len) {
- union {
- struct tdb_used_record u;
- struct tdb_free_record f;
- struct tdb_recovery_record r;
- } rec;
- /* r is larger: only get that if we need to. */
- ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec.f));
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
-
- /* If we crash after ftruncate, we can get zeroes or fill. */
- if (rec.r.magic == TDB_RECOVERY_INVALID_MAGIC
- || rec.r.magic == 0x4343434343434343ULL) {
- ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec.r));
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
- if (recovery == off) {
- found_recovery = true;
- len = sizeof(rec.r) + rec.r.max_len;
- } else {
- len = dead_space(tdb, off);
- if (TDB_OFF_IS_ERR(len)) {
- return TDB_OFF_TO_ERR(len);
- }
- if (len < sizeof(rec.r)) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: invalid"
- " dead space at %zu",
- (size_t)off);
- }
-
- tdb_logerr(tdb, TDB_SUCCESS, TDB_LOG_WARNING,
- "Dead space at %zu-%zu (of %zu)",
- (size_t)off, (size_t)(off + len),
- (size_t)tdb->file->map_size);
- }
- } else if (rec.r.magic == TDB_RECOVERY_MAGIC) {
- ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec.r));
- if (ecode != TDB_SUCCESS) {
- return ecode;
- }
- if (recovery != off) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: unexpected"
- " recovery record at offset"
- " %zu",
- (size_t)off);
- }
- if (rec.r.len > rec.r.max_len) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: invalid recovery"
- " length %zu",
- (size_t)rec.r.len);
- }
- if (rec.r.eof > tdb->file->map_size) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: invalid old EOF"
- " %zu", (size_t)rec.r.eof);
- }
- found_recovery = true;
- len = sizeof(rec.r) + rec.r.max_len;
- } else if (frec_magic(&rec.f) == TDB_FREE_MAGIC) {
- len = sizeof(rec.u) + frec_len(&rec.f);
- if (off + len > tdb->file->map_size) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: free overlength"
- " %llu at offset %llu",
- (long long)len,
- (long long)off);
- }
- /* This record should be in free lists. */
- if (frec_ftable(&rec.f) != TDB_FTABLE_NONE
- && !append(fr, num_free, off)) {
- return tdb_logerr(tdb, TDB_ERR_OOM,
- TDB_LOG_ERROR,
- "tdb_check: tracking %zu'th"
- " free record.", *num_free);
- }
- } else if (rec_magic(&rec.u) == TDB_USED_MAGIC
- || rec_magic(&rec.u) == TDB_CHAIN_MAGIC
- || rec_magic(&rec.u) == TDB_HTABLE_MAGIC
- || rec_magic(&rec.u) == TDB_FTABLE_MAGIC
- || rec_magic(&rec.u) == TDB_CAP_MAGIC) {
- uint64_t klen, dlen, extra;
-
- /* This record is used! */
- if (!append(used, num_used, off)) {
- return tdb_logerr(tdb, TDB_ERR_OOM,
- TDB_LOG_ERROR,
- "tdb_check: tracking %zu'th"
- " used record.", *num_used);
- }
-
- klen = rec_key_length(&rec.u);
- dlen = rec_data_length(&rec.u);
- extra = rec_extra_padding(&rec.u);
-
- len = sizeof(rec.u) + klen + dlen + extra;
- if (off + len > tdb->file->map_size) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: used overlength"
- " %llu at offset %llu",
- (long long)len,
- (long long)off);
- }
-
- if (len < sizeof(rec.f)) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: too short record"
- " %llu at %llu",
- (long long)len,
- (long long)off);
- }
-
- /* Check that records have correct 0 at end (but may
- * not in future). */
- if (extra && !features
- && rec_magic(&rec.u) != TDB_CAP_MAGIC) {
- const char *p;
- char c;
- p = tdb_access_read(tdb, off + sizeof(rec.u)
- + klen + dlen, 1, false);
- if (TDB_PTR_IS_ERR(p))
- return TDB_PTR_ERR(p);
- c = *p;
- tdb_access_release(tdb, p);
-
- if (c != '\0') {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check:"
- " non-zero extra"
- " at %llu",
- (long long)off);
- }
- }
- } else {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT,
- TDB_LOG_ERROR,
- "tdb_check: Bad magic 0x%llx"
- " at offset %zu",
- (long long)rec_magic(&rec.u),
- (size_t)off);
- }
- }
-
- /* We must have found recovery area if there was one. */
- if (recovery != 0 && !found_recovery) {
- return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: expected a recovery area at %zu",
- (size_t)recovery);
- }
-
- return TDB_SUCCESS;
-}
-
-enum TDB_ERROR tdb_check_(struct tdb_context *tdb,
- enum TDB_ERROR (*check)(TDB_DATA, TDB_DATA, void *),
- void *data)
-{
- tdb_off_t *fr = NULL, *used = NULL, ft, recovery;
- size_t num_free = 0, num_used = 0, num_found = 0, num_ftables = 0,
- num_capabilities = 0;
- uint64_t features;
- enum TDB_ERROR ecode;
-
- if (tdb->flags & TDB_CANT_CHECK) {
- return tdb_logerr(tdb, TDB_SUCCESS, TDB_LOG_WARNING,
- "tdb_check: database has unknown capability,"
- " cannot check.");
- }
-
- if (tdb->flags & TDB_VERSION1) {
- if (tdb1_check(tdb, check, data) == -1)
- return tdb->last_error;
- return TDB_SUCCESS;
- }
-
- ecode = tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_WAIT, false);
- if (ecode != TDB_SUCCESS) {
- return tdb->last_error = ecode;
- }
-
- ecode = tdb_lock_expand(tdb, F_RDLCK);
- if (ecode != TDB_SUCCESS) {
- tdb_allrecord_unlock(tdb, F_RDLCK);
- return tdb->last_error = ecode;
- }
-
- ecode = check_header(tdb, &recovery, &features, &num_capabilities);
- if (ecode != TDB_SUCCESS)
- goto out;
-
- /* First we do a linear scan, checking all records. */
- ecode = check_linear(tdb, &used, &num_used, &fr, &num_free, features,
- recovery);
- if (ecode != TDB_SUCCESS)
- goto out;
-
- for (ft = first_ftable(tdb); ft; ft = next_ftable(tdb, ft)) {
- if (TDB_OFF_IS_ERR(ft)) {
- ecode = TDB_OFF_TO_ERR(ft);
- goto out;
- }
- ecode = check_free_table(tdb, ft, num_ftables, fr, num_free,
- &num_found);
- if (ecode != TDB_SUCCESS)
- goto out;
- num_ftables++;
- }
-
- /* FIXME: Check key uniqueness? */
- ecode = check_hash(tdb, used, num_used, num_ftables + num_capabilities,
- check, data);
- if (ecode != TDB_SUCCESS)
- goto out;
-
- if (num_found != num_free) {
- ecode = tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "tdb_check: Not all entries are in"
- " free table");
- }
-
-out:
- tdb_allrecord_unlock(tdb, F_RDLCK);
- tdb_unlock_expand(tdb, F_RDLCK);
- free(fr);
- free(used);
- return tdb->last_error = ecode;
-}
projects / ccan / blobdiff