return tdb_read_off(tdb, ftable + offsetof(struct tdb_freetable,next));
}
-int tdb_ftable_init(struct tdb_context *tdb)
+enum TDB_ERROR tdb_ftable_init(struct tdb_context *tdb)
{
/* Use reservoir sampling algorithm to select a free list at random. */
unsigned int rnd, max = 0, count = 0;
while (off) {
if (TDB_OFF_IS_ERR(off)) {
- tdb->ecode = off;
- return -1;
+ return off;
}
rnd = random();
off = next_ftable(tdb, off);
count++;
}
- return 0;
+ return TDB_SUCCESS;
}
/* Offset of a given bucket. */
}
/* Remove from free bucket. */
-static int remove_from_list(struct tdb_context *tdb,
- tdb_off_t b_off, tdb_off_t r_off,
- const struct tdb_free_record *r)
+static enum TDB_ERROR remove_from_list(struct tdb_context *tdb,
+ tdb_off_t b_off, tdb_off_t r_off,
+ const struct tdb_free_record *r)
{
tdb_off_t off;
enum TDB_ERROR ecode;
#ifdef CCAN_TDB2_DEBUG
if (tdb_read_off(tdb, off) != r_off) {
- tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "remove_from_list: %llu bad prev in list %llu",
- (long long)r_off, (long long)b_off);
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "remove_from_list:"
+ " %llu bad prev in list %llu",
+ (long long)r_off, (long long)b_off);
}
#endif
/* r->prev->next = r->next */
ecode = tdb_write_off(tdb, off, r->next);
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
- return -1;
+ return ecode;
}
if (r->next != 0) {
#ifdef CCAN_TDB2_DEBUG
if (tdb_read_off(tdb, off) & TDB_OFF_MASK != r_off) {
- tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "remove_from_list: %llu bad list %llu",
- (long long)r_off, (long long)b_off);
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "remove_from_list:"
+ " %llu bad list %llu",
+ (long long)r_off, (long long)b_off);
}
#endif
ecode = tdb_write_off(tdb, off, r->magic_and_prev);
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
- return -1;
+ return ecode;
}
}
- return 0;
+ return TDB_SUCCESS;
}
/* Enqueue in this free bucket. */
-static int enqueue_in_free(struct tdb_context *tdb,
- tdb_off_t b_off,
- tdb_off_t off,
- tdb_len_t len)
+static enum TDB_ERROR enqueue_in_free(struct tdb_context *tdb,
+ tdb_off_t b_off,
+ tdb_off_t off,
+ tdb_len_t len)
{
struct tdb_free_record new;
enum TDB_ERROR ecode;
/* new->next = head. */
new.next = tdb_read_off(tdb, b_off);
if (TDB_OFF_IS_ERR(new.next)) {
- tdb->ecode = new.next;
- return -1;
+ return new.next;
}
if (new.next) {
new.next + offsetof(struct tdb_free_record,
magic_and_prev))
!= magic) {
- tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "enqueue_in_free: %llu bad head"
- " prev %llu",
- (long long)new.next, (long long)b_off);
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "enqueue_in_free: %llu bad head"
+ " prev %llu",
+ (long long)new.next,
+ (long long)b_off);
}
#endif
/* next->prev = new. */
magic_and_prev),
off | magic);
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
- return -1;
+ return ecode;
}
}
/* head = new */
ecode = tdb_write_off(tdb, b_off, off);
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
- return -1;
+ return ecode;
}
- ecode = tdb_write_convert(tdb, off, &new, sizeof(new));
- if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
- return -1;
- }
- return 0;
+ return tdb_write_convert(tdb, off, &new, sizeof(new));
}
/* List need not be locked. */
-int add_free_record(struct tdb_context *tdb,
- tdb_off_t off, tdb_len_t len_with_header)
+enum TDB_ERROR add_free_record(struct tdb_context *tdb,
+ tdb_off_t off, tdb_len_t len_with_header)
{
tdb_off_t b_off;
tdb_len_t len;
- int ret;
enum TDB_ERROR ecode;
assert(len_with_header >= sizeof(struct tdb_free_record));
b_off = bucket_off(tdb->ftable_off, size_to_bucket(len));
ecode = tdb_lock_free_bucket(tdb, b_off, TDB_LOCK_WAIT);
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
- return -1;
+ return ecode;
}
- ret = enqueue_in_free(tdb, b_off, off, len);
+ ecode = enqueue_in_free(tdb, b_off, off, len);
tdb_unlock_free_bucket(tdb, b_off);
- return ret;
+ return ecode;
}
static size_t adjust_size(size_t keylen, size_t datalen)
}
/* Note: we unlock the current bucket if we coalesce or fail. */
-static int coalesce(struct tdb_context *tdb,
- tdb_off_t off, tdb_off_t b_off, tdb_len_t data_len)
+static tdb_bool_err coalesce(struct tdb_context *tdb,
+ tdb_off_t off, tdb_off_t b_off,
+ tdb_len_t data_len)
{
tdb_off_t end;
struct tdb_free_record rec;
r = tdb_access_read(tdb, end, sizeof(*r), true);
if (TDB_PTR_IS_ERR(r)) {
- tdb->ecode = TDB_PTR_ERR(r);
+ ecode = TDB_PTR_ERR(r);
goto err;
}
ftable = frec_ftable(r);
bucket = size_to_bucket(frec_len(r));
- nb_off = bucket_off(ftable_offset(tdb, ftable), bucket);
+ nb_off = ftable_offset(tdb, ftable);
+ if (TDB_OFF_IS_ERR(nb_off)) {
+ tdb_access_release(tdb, r);
+ ecode = nb_off;
+ goto err;
+ }
+ nb_off = bucket_off(nb_off, bucket);
tdb_access_release(tdb, r);
/* We may be violating lock order here, so best effort. */
/* Now we have lock, re-check. */
ecode = tdb_read_convert(tdb, end, &rec, sizeof(rec));
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
tdb_unlock_free_bucket(tdb, nb_off);
goto err;
}
break;
}
- if (remove_from_list(tdb, nb_off, end, &rec) == -1) {
+ ecode = remove_from_list(tdb, nb_off, end, &rec);
+ if (ecode != TDB_SUCCESS) {
tdb_unlock_free_bucket(tdb, nb_off);
goto err;
}
/* Didn't find any adjacent free? */
if (end == off + sizeof(struct tdb_used_record) + data_len)
- return 0;
+ return false;
/* OK, expand initial record */
ecode = tdb_read_convert(tdb, off, &rec, sizeof(rec));
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
goto err;
}
if (frec_len(&rec) != data_len) {
- tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "coalesce: expected data len %zu not %zu",
- (size_t)data_len, (size_t)frec_len(&rec));
+ ecode = tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "coalesce: expected data len %zu not %zu",
+ (size_t)data_len, (size_t)frec_len(&rec));
goto err;
}
- if (remove_from_list(tdb, b_off, off, &rec) == -1)
+ ecode = remove_from_list(tdb, b_off, off, &rec);
+ if (ecode != TDB_SUCCESS) {
goto err;
+ }
/* We have to drop this to avoid deadlocks, so make sure record
* doesn't get coalesced by someone else! */
ftable_and_len),
rec.ftable_and_len);
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
goto err;
}
add_stat(tdb, alloc_coalesce_succeeded, 1);
tdb_unlock_free_bucket(tdb, b_off);
- if (add_free_record(tdb, off, end - off) == -1)
- return -1;
- return 1;
+ ecode = add_free_record(tdb, off, end - off);
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
+ return ecode;
+ }
+ return true;
err:
/* To unify error paths, we *always* unlock bucket on error. */
tdb_unlock_free_bucket(tdb, b_off);
- return -1;
+ return ecode;
}
/* We need size bytes to put our key and data in. */
/* Lock this bucket. */
ecode = tdb_lock_free_bucket(tdb, b_off, TDB_LOCK_WAIT);
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
- return TDB_OFF_ERR;
+ return ecode;
}
best.ftable_and_len = -1ULL;
* as we go. */
off = tdb_read_off(tdb, b_off);
if (TDB_OFF_IS_ERR(off)) {
- tdb->ecode = off;
+ ecode = off;
goto unlock_err;
}
const struct tdb_free_record *r;
tdb_len_t len;
tdb_off_t next;
+ int coal;
r = tdb_access_read(tdb, off, sizeof(*r), true);
if (TDB_PTR_IS_ERR(r)) {
- tdb->ecode = TDB_PTR_ERR(r);
+ ecode = TDB_PTR_ERR(r);
goto unlock_err;
}
if (frec_magic(r) != TDB_FREE_MAGIC) {
tdb_access_release(tdb, r);
- tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
- "lock_and_alloc: %llu non-free 0x%llx",
- (long long)off, (long long)r->magic_and_prev);
+ ecode = tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
+ "lock_and_alloc:"
+ " %llu non-free 0x%llx",
+ (long long)off,
+ (long long)r->magic_and_prev);
goto unlock_err;
}
tdb_access_release(tdb, r);
/* Since we're going slow anyway, try coalescing here. */
- switch (coalesce(tdb, off, b_off, len)) {
- case -1:
- /* This has already unlocked on error. */
- return -1;
- case 1:
+ coal = coalesce(tdb, off, b_off, len);
+ if (coal == 1) {
/* This has unlocked list, restart. */
goto again;
}
+ if (coal < 0) {
+ /* This has already unlocked on error. */
+ return coal;
+ }
off = next;
}
size_t leftover;
/* We're happy with this size: take it. */
- if (remove_from_list(tdb, b_off, best_off, &best) != 0)
+ ecode = remove_from_list(tdb, b_off, best_off, &best);
+ if (ecode != TDB_SUCCESS) {
goto unlock_err;
+ }
leftover = record_leftover(keylen, datalen, want_extra,
frec_len(&best));
assert(keylen + datalen + leftover <= frec_len(&best));
/* We need to mark non-free before we drop lock, otherwise
* coalesce() could try to merge it! */
- if (set_header(tdb, &rec, magic, keylen, datalen,
- frec_len(&best) - leftover, hashlow) != 0)
+ ecode = set_header(tdb, &rec, magic, keylen, datalen,
+ frec_len(&best) - leftover, hashlow);
+ if (ecode != TDB_SUCCESS) {
goto unlock_err;
+ }
ecode = tdb_write_convert(tdb, best_off, &rec, sizeof(rec));
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
goto unlock_err;
}
* locking is allowed. */
if (leftover) {
add_stat(tdb, alloc_leftover, 1);
- if (add_free_record(tdb,
- best_off + sizeof(rec)
- + frec_len(&best) - leftover,
- leftover))
- best_off = TDB_OFF_ERR;
+ ecode = add_free_record(tdb,
+ best_off + sizeof(rec)
+ + frec_len(&best) - leftover,
+ leftover);
+ if (ecode != TDB_SUCCESS) {
+ best_off = ecode;
+ }
}
tdb_unlock_free_bucket(tdb, b_off);
unlock_err:
tdb_unlock_free_bucket(tdb, b_off);
- return TDB_OFF_ERR;
+ return ecode;
}
-/* Get a free block from current free list, or 0 if none. */
+/* Get a free block from current free list, or 0 if none, -ve on error. */
static tdb_off_t get_free(struct tdb_context *tdb,
size_t keylen, size_t datalen, bool want_extra,
unsigned magic, unsigned hashlow)
off = lock_and_alloc(tdb, ftable_off,
b, keylen, datalen, want_extra,
magic, hashlow);
- if (off == TDB_OFF_ERR)
- return TDB_OFF_ERR;
+ if (TDB_OFF_IS_ERR(off))
+ return off;
if (off != 0) {
if (b == start_b)
add_stat(tdb, alloc_bucket_exact, 1);
}
if (TDB_OFF_IS_ERR(b)) {
- tdb->ecode = b;
- return 0;
+ return b;
}
/* Hmm, try next table. */
ftable_off = next_ftable(tdb, ftable_off);
if (TDB_OFF_IS_ERR(ftable_off)) {
- tdb->ecode = ftable_off;
- return 0;
+ return ftable_off;
}
ftable++;
wrapped = true;
ftable_off = first_ftable(tdb);
if (TDB_OFF_IS_ERR(ftable_off)) {
- tdb->ecode = ftable_off;
- return 0;
+ return ftable_off;
}
ftable = 0;
}
return 0;
}
-int set_header(struct tdb_context *tdb,
- struct tdb_used_record *rec,
- unsigned magic, uint64_t keylen, uint64_t datalen,
- uint64_t actuallen, unsigned hashlow)
+enum TDB_ERROR set_header(struct tdb_context *tdb,
+ struct tdb_used_record *rec,
+ unsigned magic, uint64_t keylen, uint64_t datalen,
+ uint64_t actuallen, unsigned hashlow)
{
uint64_t keybits = (fls64(keylen) + 1) / 2;
if (rec_key_length(rec) != keylen
|| rec_data_length(rec) != datalen
|| rec_extra_padding(rec) != actuallen - (keylen + datalen)) {
- tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
- "Could not encode k=%llu,d=%llu,a=%llu",
- (long long)keylen, (long long)datalen,
- (long long)actuallen);
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
+ "Could not encode k=%llu,d=%llu,a=%llu",
+ (long long)keylen, (long long)datalen,
+ (long long)actuallen);
}
- return 0;
+ return TDB_SUCCESS;
}
/* Expand the database. */
-static int tdb_expand(struct tdb_context *tdb, tdb_len_t size)
+static enum TDB_ERROR tdb_expand(struct tdb_context *tdb, tdb_len_t size)
{
uint64_t old_size;
tdb_len_t wanted;
/* Need to hold a hash lock to expand DB: transactions rely on it. */
if (!(tdb->flags & TDB_NOLOCK)
&& !tdb->allrecord_lock.count && !tdb_has_hash_locks(tdb)) {
- tdb_logerr(tdb, TDB_ERR_LOCK, TDB_LOG_ERROR,
- "tdb_expand: must hold lock during expand");
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_LOCK, TDB_LOG_ERROR,
+ "tdb_expand: must hold lock during expand");
}
/* always make room for at least 100 more records, and at
/* Only one person can expand file at a time. */
ecode = tdb_lock_expand(tdb, F_WRLCK);
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
- return -1;
+ return ecode;
}
/* Someone else may have expanded the file, so retry. */
tdb->methods->oob(tdb, tdb->map_size + 1, true);
if (tdb->map_size != old_size) {
tdb_unlock_expand(tdb, F_WRLCK);
- return 0;
+ return TDB_SUCCESS;
}
ecode = tdb->methods->expand_file(tdb, wanted);
if (ecode != TDB_SUCCESS) {
- tdb->ecode = ecode;
tdb_unlock_expand(tdb, F_WRLCK);
- return -1;
+ return ecode;
}
/* We need to drop this lock before adding free record. */
assert(!tdb->direct_access);
for (;;) {
+ enum TDB_ERROR ecode;
off = get_free(tdb, keylen, datalen, growing, magic, hash);
if (likely(off != 0))
break;
- if (tdb_expand(tdb, adjust_size(keylen, datalen)))
- return TDB_OFF_ERR;
+ ecode = tdb_expand(tdb, adjust_size(keylen, datalen));
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
+ }
}
return off;
projects / ccan / blobdiff