- /*
+ /*
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
return true;
}
-static bool check_header(struct tdb_context *tdb)
+static bool check_header(struct tdb_context *tdb, tdb_off_t *recovery)
{
uint64_t hash_test;
+ struct tdb_header hdr;
+ enum TDB_ERROR ecode;
+
+ ecode = tdb_read_convert(tdb, 0, &hdr, sizeof(hdr));
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
+ return false;
+ }
+ /* 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 (tdb->header.hash_test != hash_test) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "check: hash test %llu should be %llu\n",
- tdb->header.hash_test, hash_test);
+ if (hdr.hash_test != hash_test) {
+ 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);
return false;
}
- if (strcmp(tdb->header.magic_food, TDB_MAGIC_FOOD) != 0) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "check: bad magic '%.*s'\n",
- sizeof(tdb->header.magic_food),
- tdb->header.magic_food);
+
+ if (strcmp(hdr.magic_food, TDB_MAGIC_FOOD) != 0) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "check: bad magic '%.*s'",
+ (unsigned)sizeof(hdr.magic_food), hdr.magic_food);
return false;
}
- if (tdb->header.v.hash_bits < INITIAL_HASH_BITS) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "check: bad hash bits %llu\n",
- (long long)tdb->header.v.hash_bits);
+
+ *recovery = hdr.recovery;
+ if (*recovery) {
+ if (*recovery < sizeof(hdr) || *recovery > tdb->map_size) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: invalid recovery offset %zu",
+ (size_t)*recovery);
+ return false;
+ }
+ }
+
+ /* Don't check reserved: they *can* be used later. */
+ return true;
+}
+
+static bool 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,
+ int (*check)(TDB_DATA, TDB_DATA, void *),
+ void *private_data);
+
+static bool 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,
+ int (*check)(TDB_DATA, TDB_DATA, void *),
+ void *private_data)
+{
+ struct tdb_used_record rec;
+ enum TDB_ERROR ecode;
+
+ ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec));
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
return false;
}
- if (tdb->header.v.zone_bits < INITIAL_ZONE_BITS) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "check: bad zone_bits %llu\n",
- (long long)tdb->header.v.zone_bits);
+
+ if (rec_magic(&rec) != TDB_CHAIN_MAGIC) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: Bad hash chain magic %llu",
+ (long long)rec_magic(&rec));
return false;
}
- if (tdb->header.v.free_buckets < INITIAL_FREE_BUCKETS) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "check: bad free_buckets %llu\n",
- (long long)tdb->header.v.free_buckets);
+
+ if (rec_data_length(&rec) != sizeof(struct tdb_chain)) {
+ 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));
return false;
}
- if ((1ULL << tdb->header.v.zone_bits) * tdb->header.v.num_zones
- < tdb->map_size) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "check: %llu zones size %llu don't cover %llu\n",
- (long long)(1ULL << tdb->header.v.zone_bits),
- (long long)tdb->header.v.num_zones,
- (long long)tdb->map_size);
+ if (rec_key_length(&rec) != 0) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: Bad hash chain key length %llu",
+ (long long)rec_key_length(&rec));
+ return false;
+ }
+ if (rec_hash(&rec) != 0) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: Bad hash chain hash value %llu",
+ (long long)rec_hash(&rec));
return false;
}
- /* We check hash_off and free_off later. */
-
- /* Don't check reserved: they *can* be used later. */
- return true;
-}
+ off += sizeof(rec);
+ if (!check_hash_tree(tdb, off, 0, hash, 64,
+ used, num_used, num_found, check, private_data))
+ return false;
-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;
+ off = tdb_read_off(tdb, off + offsetof(struct tdb_chain, next));
+ if (off == TDB_OFF_ERR)
+ return false;
+ if (off == 0)
+ return true;
+ (*num_found)++;
+ return check_hash_chain(tdb, off, hash, used, num_used, num_found,
+ check, private_data);
}
-static bool check_hash_list(struct tdb_context *tdb,
- tdb_off_t used[],
- size_t num_used)
+static bool 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,
+ int (*check)(TDB_DATA, TDB_DATA, void *),
+ void *private_data)
{
struct tdb_used_record rec;
- tdb_len_t hashlen, i, num_nonzero;
- tdb_off_t h;
- size_t num_found;
+ enum TDB_ERROR ecode;
- hashlen = sizeof(tdb_off_t) << tdb->header.v.hash_bits;
+ if (hprefix_bits >= 64)
+ return check_hash_chain(tdb, off, hprefix, used, num_used,
+ num_found, check, private_data);
- if (tdb_read_convert(tdb, tdb->header.v.hash_off - sizeof(rec),
- &rec, sizeof(rec)) == -1)
+ ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec));
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
return false;
+ }
- if (rec_data_length(&rec) != hashlen) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Bad hash table length %llu vs %llu\n",
- (long long)rec_data_length(&rec),
- (long long)hashlen);
+ if (rec_magic(&rec) != TDB_HTABLE_MAGIC) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: Bad hash table magic %llu",
+ (long long)rec_magic(&rec));
+ return false;
+ }
+ if (rec_data_length(&rec)
+ != sizeof(tdb_off_t) << TDB_SUBLEVEL_HASH_BITS) {
+ 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);
return false;
}
if (rec_key_length(&rec) != 0) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Bad hash table key length %llu\n",
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: Bad hash table key length %llu",
(long long)rec_key_length(&rec));
return false;
}
if (rec_hash(&rec) != 0) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Bad hash table hash value %llu\n",
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: Bad hash table hash value %llu",
(long long)rec_hash(&rec));
return false;
}
- num_found = 0;
- num_nonzero = 0;
- for (i = 0, h = tdb->header.v.hash_off;
- i < (1ULL << tdb->header.v.hash_bits);
- i++, h += sizeof(tdb_off_t)) {
- tdb_off_t off, *p, pos;
- struct tdb_used_record rec;
- uint64_t hash;
+ 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, private_data);
+}
- off = tdb_read_off(tdb, h);
- if (off == TDB_OFF_ERR)
- return false;
- if (!off) {
- num_nonzero = 0;
- continue;
- }
- /* FIXME: Check hash bits */
- p = asearch(&off, used, num_used, off_cmp);
- if (!p) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Invalid offset %llu in hash\n",
- (long long)off);
- return false;
- }
- /* Mark it invalid. */
- *p ^= 1;
- num_found++;
+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;
+}
- if (tdb_read_convert(tdb, off, &rec, sizeof(rec)) == -1)
- return false;
+static uint64_t get_bits(uint64_t h, unsigned num, unsigned *used)
+{
+ *used += num;
- /* Check it is hashed correctly. */
- hash = hash_record(tdb, off);
+ return (h >> (64 - *used)) & ((1U << num) - 1);
+}
- /* Top bits must match header. */
- if (hash >> (64 - 11) != rec_hash(&rec)) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Bad hash magic at offset %llu"
- " (0x%llx vs 0x%llx)\n",
- (long long)off,
- (long long)hash, (long long)rec_hash(&rec));
- return false;
- }
+static bool 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,
+ int (*check)(TDB_DATA, TDB_DATA, void *),
+ void *private_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)) {
+ tdb->ecode = TDB_PTR_ERR(hash);
+ return false;
+ }
- /* It must be in the right place in hash array. */
- pos = hash & ((1ULL << tdb->header.v.hash_bits)-1);
- if (pos < i - num_nonzero || pos > i) {
- /* Could be wrap from end of array? FIXME: check? */
- if (i != num_nonzero) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Bad hash position %llu at"
- " offset %llu hash 0x%llx\n",
- (long long)i,
- (long long)off,
- (long long)hash);
- return false;
+ 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) {
+ 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])) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ TDB_LOG_ERROR,
+ "tdb_check: Invalid chain"
+ " entry subhash");
+ goto fail;
+ }
+ h = hash_record(tdb, off);
+ if (h != hprefix) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ 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) {
+ tdb->ecode = ecode;
+ 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;
+
+ if (!check_hash_record(tdb,
+ group[b] & TDB_OFF_MASK,
+ subprefix,
+ hprefix_bits
+ + group_bits
+ + TDB_HASH_GROUP_BITS,
+ used, num_used, num_found,
+ check, private_data))
+ 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) {
+ 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) {
+ 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;
+ 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) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ 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) {
+ tdb->ecode = ecode;
+ goto fail;
+ }
+
+ /* Bottom bits must match header. */
+ if ((h & ((1 << 11)-1)) != rec_hash(&rec)) {
+ 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 key, data;
+ key.dsize = rec_key_length(&rec);
+ data.dsize = rec_data_length(&rec);
+ key.dptr = (void *)tdb_access_read(tdb,
+ off + sizeof(rec),
+ key.dsize + data.dsize,
+ false);
+ if (TDB_PTR_IS_ERR(key.dptr)) {
+ tdb->ecode = TDB_PTR_ERR(key.dptr);
+ goto fail;
+ }
+ data.dptr = key.dptr + key.dsize;
+ if (check(key, data, private_data) != 0)
+ goto fail;
+ tdb_access_release(tdb, key.dptr);
}
}
- num_nonzero++;
}
+ tdb_access_release(tdb, hash);
+ return true;
+
+fail:
+ tdb_access_release(tdb, hash);
+ return false;
+}
+
+static bool check_hash(struct tdb_context *tdb,
+ tdb_off_t used[],
+ size_t num_used, size_t num_ftables,
+ int (*check)(TDB_DATA, TDB_DATA, void *),
+ void *private_data)
+{
+ /* Free tables also show up as used. */
+ size_t num_found = num_ftables;
- /* free table and hash table are two of the used blocks. */
- if (num_found != num_used - 2) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Not all entries are in hash\n");
+ if (!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, private_data))
+ return false;
+
+ if (num_found != num_used) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: Not all entries are in hash");
return false;
}
return true;
static bool check_free(struct tdb_context *tdb,
tdb_off_t off,
const struct tdb_free_record *frec,
- tdb_off_t prev,
- tdb_off_t zone, unsigned int bucket)
+ tdb_off_t prev, unsigned int ftable,
+ unsigned int bucket)
{
- if (frec->magic != TDB_FREE_MAGIC) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: offset %llu bad magic 0x%llx\n",
- (long long)off, (long long)frec->magic);
+ enum TDB_ERROR ecode;
+
+ if (frec_magic(frec) != TDB_FREE_MAGIC) {
+ 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);
return false;
}
- if (tdb->methods->oob(tdb, off
- + frec->data_len-sizeof(struct tdb_used_record),
- true))
+ if (frec_ftable(frec) != ftable) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: offset %llu bad freetable %u",
+ (long long)off, frec_ftable(frec));
return false;
- if (zone_of(tdb, off) != zone) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: offset %llu in wrong zone %llu vs %llu\n",
- (long long)off,
- (long long)zone, (long long)zone_of(tdb, off));
+ }
+
+ ecode = tdb->methods->oob(tdb, off
+ + frec_len(frec)
+ + sizeof(struct tdb_used_record),
+ false);
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
return false;
}
- if (size_to_bucket(tdb, frec->data_len) != bucket) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: offset %llu in wrong bucket %u vs %u\n",
- (long long)off,
- bucket, size_to_bucket(tdb, frec->data_len));
+ if (size_to_bucket(frec_len(frec)) != bucket) {
+ 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)));
return false;
}
- if (prev != frec->prev) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: offset %llu bad prev %llu vs %llu\n",
- (long long)off,
- (long long)prev, (long long)frec->prev);
+ if (prev != frec_prev(frec)) {
+ 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 false;
}
return true;
}
-
-static bool check_free_list(struct tdb_context *tdb,
- tdb_off_t free[],
- size_t num_free)
+
+static bool 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_used_record rec;
- tdb_len_t freelen, i, j;
+ struct tdb_freetable ft;
tdb_off_t h;
- size_t num_found;
-
- freelen = sizeof(tdb_off_t) * tdb->header.v.num_zones
- * (tdb->header.v.free_buckets + 1);
-
- if (tdb_read_convert(tdb, tdb->header.v.free_off - sizeof(rec),
- &rec, sizeof(rec)) == -1)
- return false;
+ unsigned int i;
+ enum TDB_ERROR ecode;
- if (rec_data_length(&rec) != freelen) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Bad free table length %llu vs %llu\n",
- (long long)rec_data_length(&rec),
- (long long)freelen);
+ ecode = tdb_read_convert(tdb, ftable_off, &ft, sizeof(ft));
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
return false;
}
- if (rec_key_length(&rec) != 0) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Bad free table key length %llu\n",
- (long long)rec_key_length(&rec));
- return false;
- }
- if (rec_hash(&rec) != 0) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Bad free table hash value %llu\n",
- (long long)rec_hash(&rec));
+
+ 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) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: Invalid header on free table");
return false;
}
- num_found = 0;
- h = tdb->header.v.free_off;
- for (i = 0; i < tdb->header.v.num_zones; i++) {
- for (j = 0; j <= tdb->header.v.free_buckets;
- j++, h += sizeof(tdb_off_t)) {
- tdb_off_t off, prev = 0, *p;
- struct tdb_free_record f;
+ for (i = 0; i < TDB_FREE_BUCKETS; i++) {
+ tdb_off_t off, prev = 0, *p;
+ struct tdb_free_record f;
- for (off = tdb_read_off(tdb, h); off; off = f.next) {
- if (off == TDB_OFF_ERR)
- return false;
- if (tdb_read_convert(tdb, off, &f, sizeof(f)))
- return false;
- if (!check_free(tdb, off, &f, prev, i, j))
- return false;
+ h = bucket_off(ftable_off, i);
+ for (off = tdb_read_off(tdb, h); off; off = f.next) {
+ if (off == TDB_OFF_ERR)
+ return false;
+ ecode = tdb_read_convert(tdb, off, &f, sizeof(f));
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
+ return false;
+ }
+ if (!check_free(tdb, off, &f, prev, ftable_num, i))
+ return false;
- /* FIXME: Check hash bits */
- p = asearch(&off, free, num_free, off_cmp);
- if (!p) {
- tdb->log(tdb, TDB_DEBUG_ERROR,
- tdb->log_priv,
- "tdb_check: Invalid offset"
- " %llu in free table\n",
- (long long)off);
- return false;
- }
- /* Mark it invalid. */
- *p ^= 1;
- num_found++;
- prev = off;
+ /* FIXME: Check hash bits */
+ p = asearch(&off, fr, num_free, off_cmp);
+ if (!p) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ TDB_LOG_ERROR,
+ "tdb_check: Invalid offset"
+ " %llu in free table",
+ (long long)off);
+ return false;
}
+ /* Mark it invalid. */
+ *p ^= 1;
+ (*num_found)++;
+ prev = off;
}
}
- if (num_found != num_free) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Not all entries are in free table\n");
- return false;
- }
return true;
}
-/* FIXME: call check() function. */
-int tdb_check(struct tdb_context *tdb,
- int (*check)(TDB_DATA key, TDB_DATA data, void *private_data),
- void *private_data)
+/* Slow, but should be very rare. */
+size_t dead_space(struct tdb_context *tdb, tdb_off_t off)
{
- tdb_off_t *free = NULL, *used = NULL, off;
- tdb_len_t len;
- size_t num_free = 0, num_used = 0;
- bool hash_found = false, free_found = false;
-
- /* This always ensures the header is uptodate. */
- if (tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_WAIT, false) != 0)
- return -1;
+ size_t len;
+ enum TDB_ERROR ecode;
+
+ for (len = 0; off + len < tdb->map_size; len++) {
+ char c;
+ ecode = tdb->methods->tread(tdb, off, &c, 1);
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
+ return 0;
+ }
+ if (c != 0 && c != 0x43)
+ break;
+ }
+ return len;
+}
- if (!check_header(tdb))
- goto fail;
+static bool check_linear(struct tdb_context *tdb,
+ tdb_off_t **used, size_t *num_used,
+ tdb_off_t **fr, size_t *num_free,
+ tdb_off_t recovery)
+{
+ tdb_off_t off;
+ tdb_len_t len;
+ enum TDB_ERROR ecode;
+ bool found_recovery = false;
- /* First we do a linear scan, checking all records. */
- for (off = sizeof(struct tdb_header);
- off < tdb->map_size;
- off += len) {
+ for (off = sizeof(struct tdb_header); off < tdb->map_size; off += len) {
union {
struct tdb_used_record u;
struct tdb_free_record f;
- } pad, *p;
- p = tdb_get(tdb, off, &pad, sizeof(pad));
- if (!p)
- goto fail;
- if (p->f.magic == TDB_FREE_MAGIC) {
- /* This record is free! */
- if (!append(&free, &num_free, off))
- goto fail;
- len = sizeof(p->u) + p->f.data_len;
- if (tdb->methods->oob(tdb, off + len, false))
- goto fail;
- } else {
+ 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) {
+ tdb->ecode = ecode;
+ return false;
+ }
+
+ /* 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) {
+ tdb->ecode = ecode;
+ return false;
+ }
+ if (recovery == off) {
+ found_recovery = true;
+ len = sizeof(rec.r) + rec.r.max_len;
+ } else {
+ len = dead_space(tdb, off);
+ if (len < sizeof(rec.r)) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ TDB_LOG_ERROR,
+ "tdb_check: invalid dead"
+ " space at %zu",
+ (size_t)off);
+ return false;
+ }
+
+ 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->map_size);
+ }
+ } else if (rec.r.magic == TDB_RECOVERY_MAGIC) {
+ ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec.r));
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
+ return false;
+ }
+ if (recovery != off) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ TDB_LOG_ERROR,
+ "tdb_check: unexpected recovery"
+ " record at offset %zu",
+ (size_t)off);
+ return false;
+ }
+ if (rec.r.len > rec.r.max_len) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ TDB_LOG_ERROR,
+ "tdb_check: invalid recovery length"
+ " %zu", (size_t)rec.r.len);
+ return false;
+ }
+ if (rec.r.eof > tdb->map_size) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ TDB_LOG_ERROR,
+ "tdb_check: invalid old EOF"
+ " %zu", (size_t)rec.r.eof);
+ return false;
+ }
+ 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->map_size) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ TDB_LOG_ERROR,
+ "tdb_check: free overlength %llu"
+ " at offset %llu",
+ (long long)len, (long long)off);
+ return false;
+ }
+ /* This record should be in free lists. */
+ if (frec_ftable(&rec.f) != TDB_FTABLE_NONE
+ && !append(fr, num_free, off)) {
+ tdb_logerr(tdb, TDB_ERR_OOM,
+ TDB_LOG_ERROR,
+ "tdb_check: tracking %zu'th"
+ " free record.", *num_free);
+ return false;
+ }
+ } 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) {
uint64_t klen, dlen, extra;
/* This record is used! */
- if (rec_magic(&p->u) != TDB_MAGIC) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: Bad magic 0x%llx"
- " at offset %llu\n",
- (long long)rec_magic(&p->u),
- (long long)off);
- goto fail;
+ if (!append(used, num_used, off)) {
+ tdb_logerr(tdb, TDB_ERR_OOM,
+ TDB_LOG_ERROR,
+ "tdb_check: tracking %zu'th"
+ " used record.", *num_used);
+ return false;
}
-
- if (!append(&used, &num_used, off))
- goto fail;
-
- klen = rec_key_length(&p->u);
- dlen = rec_data_length(&p->u);
- extra = rec_extra_padding(&p->u);
- len = sizeof(p->u) + klen + dlen + extra;
- if (tdb->methods->oob(tdb, off + len, false))
- goto fail;
+ 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->map_size) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ TDB_LOG_ERROR,
+ "tdb_check: used overlength %llu"
+ " at offset %llu",
+ (long long)len, (long long)off);
+ return false;
+ }
- if (off + sizeof(p->u) == tdb->header.v.hash_off) {
- hash_found = true;
- } else if (off + sizeof(p->u)
- == tdb->header.v.free_off) {
- free_found = true;
+ if (len < sizeof(rec.f)) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT,
+ TDB_LOG_ERROR,
+ "tdb_check: too short record %llu"
+ " at %llu",
+ (long long)len, (long long)off);
+ return false;
}
+ } else {
+ 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);
+ return false;
}
}
- if (!hash_found) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: hash table not found at %llu\n",
- (long long)tdb->header.v.hash_off);
- goto fail;
+ /* We must have found recovery area if there was one. */
+ if (recovery != 0 && !found_recovery) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: expected a recovery area at %zu",
+ (size_t)recovery);
+ return false;
}
- if (!free_found) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_check: free table not found at %llu\n",
- (long long)tdb->header.v.free_off);
+ return true;
+}
+
+int tdb_check(struct tdb_context *tdb,
+ int (*check)(TDB_DATA key, TDB_DATA data, void *private_data),
+ void *private_data)
+{
+ tdb_off_t *fr = NULL, *used = NULL, ft, recovery;
+ size_t num_free = 0, num_used = 0, num_found = 0, num_ftables = 0;
+ enum TDB_ERROR ecode;
+
+ ecode = tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_WAIT, false);
+ if (ecpde != TDB_SUCCESS) {
+ tdb->ecode = ecode;
+ return -1;
+ }
+
+ ecode = tdb_lock_expand(tdb, F_RDLCK);
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
+ tdb_allrecord_unlock(tdb, F_RDLCK);
+ return -1;
+ }
+
+ if (!check_header(tdb, &recovery))
+ goto fail;
+
+ /* First we do a linear scan, checking all records. */
+ if (!check_linear(tdb, &used, &num_used, &fr, &num_free, recovery))
goto fail;
+
+ for (ft = first_ftable(tdb); ft; ft = next_ftable(tdb, ft)) {
+ if (ft == TDB_OFF_ERR)
+ goto fail;
+ if (!check_free_table(tdb, ft, num_ftables, fr, num_free,
+ &num_found))
+ goto fail;
+ num_ftables++;
}
/* FIXME: Check key uniqueness? */
- if (!check_hash_list(tdb, used, num_used))
+ if (!check_hash(tdb, used, num_used, num_ftables, check, private_data))
goto fail;
- if (!check_free_list(tdb, free, num_free))
- goto fail;
+ if (num_found != num_free) {
+ tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "tdb_check: Not all entries are in free table");
+ return -1;
+ }
tdb_allrecord_unlock(tdb, F_RDLCK);
+ tdb_unlock_expand(tdb, F_RDLCK);
+ free(fr);
+ free(used);
return 0;
fail:
+ free(fr);
+ free(used);
tdb_allrecord_unlock(tdb, F_RDLCK);
+ tdb_unlock_expand(tdb, F_RDLCK);
return -1;
}
projects / ccan / blobdiff