tdb2: rework free.c functions to return enum TDB_ERROR.

ccan/tdb2/free.c

@@ -59,7 +59,7 @@ tdb_off_t next_ftable(struct tdb_context *tdb, tdb_off_t ftable)
 	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;
@@ -70,8 +70,7 @@ int tdb_ftable_init(struct tdb_context *tdb)
 
 	while (off) {
 		if (TDB_OFF_IS_ERR(off)) {
-			tdb->ecode = off;
-			return -1;
+			return off;
 		}
 
 		rnd = random();
@@ -84,7 +83,7 @@ int tdb_ftable_init(struct tdb_context *tdb)
 		off = next_ftable(tdb, off);
 		count++;
 	}
-	return 0;
+	return TDB_SUCCESS;
 }
 
 /* Offset of a given bucket. */
@@ -105,9 +104,9 @@ static tdb_off_t find_free_head(struct tdb_context *tdb,
 }
 
 /* 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;
@@ -121,18 +120,17 @@ static int remove_from_list(struct tdb_context *tdb,
 
 #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) {
@@ -141,27 +139,26 @@ static int remove_from_list(struct tdb_context *tdb,
 
 #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;
@@ -176,8 +173,7 @@ static int enqueue_in_free(struct tdb_context *tdb,
 	/* 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) {
@@ -186,11 +182,11 @@ static int enqueue_in_free(struct tdb_context *tdb,
 				 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. */
@@ -199,32 +195,24 @@ static int enqueue_in_free(struct tdb_context *tdb,
 						 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));
@@ -234,13 +222,12 @@ int add_free_record(struct tdb_context *tdb,
 	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)
@@ -290,8 +277,9 @@ static tdb_off_t ftable_offset(struct tdb_context *tdb, unsigned int ftable)
 }
 
 /* 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;
@@ -307,7 +295,7 @@ static int coalesce(struct tdb_context *tdb,
 
 		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;
 		}
 
@@ -319,7 +307,13 @@ static int coalesce(struct tdb_context *tdb,
 
 		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. */
@@ -332,7 +326,6 @@ static int coalesce(struct tdb_context *tdb,
 		/* 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;
 		}
@@ -350,7 +343,8 @@ static int coalesce(struct tdb_context *tdb,
 			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;
 		}
@@ -362,24 +356,25 @@ static int coalesce(struct tdb_context *tdb,
 
 	/* 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! */
@@ -389,21 +384,23 @@ static int coalesce(struct tdb_context *tdb,
 						  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. */
@@ -429,8 +426,7 @@ again:
 	/* 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;
@@ -446,7 +442,7 @@ again:
 	 * as we go. */
 	off = tdb_read_off(tdb, b_off);
 	if (TDB_OFF_IS_ERR(off)) {
-		tdb->ecode = off;
+		ecode = off;
 		goto unlock_err;
 	}
 
@@ -454,18 +450,21 @@ again:
 		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;
 		}
 
@@ -486,14 +485,15 @@ again:
 		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;
 	}
 
@@ -503,8 +503,10 @@ again:
 		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));
@@ -512,13 +514,14 @@ again:
 		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;
 		}
 
@@ -526,11 +529,13 @@ again:
 		 * 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);
 
@@ -542,10 +547,10 @@ again:
 
 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)
@@ -572,8 +577,8 @@ static tdb_off_t get_free(struct tdb_context *tdb,
 			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);
@@ -588,15 +593,13 @@ static tdb_off_t get_free(struct tdb_context *tdb,
 		}
 
 		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++;
 
@@ -604,8 +607,7 @@ static tdb_off_t get_free(struct tdb_context *tdb,
 			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;
 		}
@@ -614,10 +616,10 @@ static tdb_off_t get_free(struct tdb_context *tdb,
 	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;
 
@@ -632,17 +634,16 @@ int set_header(struct tdb_context *tdb,
 	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;
@@ -654,9 +655,8 @@ static int tdb_expand(struct tdb_context *tdb, tdb_len_t size)
 	/* 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
@@ -670,8 +670,7 @@ static int tdb_expand(struct tdb_context *tdb, tdb_len_t size)
 	/* 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. */
@@ -679,14 +678,13 @@ static int tdb_expand(struct tdb_context *tdb, tdb_len_t size)
 	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. */
@@ -706,12 +704,15 @@ tdb_off_t alloc(struct tdb_context *tdb, size_t keylen, size_t datalen,
 	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;

ccan/tdb2/hash.c

@@ -448,8 +448,8 @@ static enum TDB_ERROR COLD add_to_chain(struct tdb_context *tdb,
 		if (!next) {
 			next = alloc(tdb, 0, sizeof(struct tdb_chain), 0,
 				     TDB_CHAIN_MAGIC, false);
-			if (next == TDB_OFF_ERR)
-				return tdb->ecode;
+			if (TDB_OFF_IS_ERR(next))
+				return next;
 			ecode = zero_out(tdb,
 					 next+sizeof(struct tdb_used_record),
 					 sizeof(struct tdb_chain));
@@ -521,8 +521,8 @@ static enum TDB_ERROR expand_group(struct tdb_context *tdb, struct hash_info *h)
 	}
 
 	subhash = alloc(tdb, 0, subsize, 0, magic, false);
-	if (subhash == TDB_OFF_ERR) {
-		return tdb->ecode;
+	if (TDB_OFF_IS_ERR(subhash)) {
+		return subhash;
 	}
 
 	ecode = zero_out(tdb, subhash + sizeof(struct tdb_used_record),

ccan/tdb2/private.h

@@ -73,7 +73,6 @@ typedef uint64_t tdb_off_t;
 #define TDB_RECOVERY_MAGIC (0xf53bc0e7ad124589ULL)
 #define TDB_RECOVERY_INVALID_MAGIC (0x0ULL)
 
-#define TDB_OFF_ERR ((tdb_off_t)-1)
 #define TDB_OFF_IS_ERR(off) unlikely(off >= (tdb_off_t)TDB_ERR_LAST)
 
 /* Packing errors into pointers and v.v. */
@@ -429,25 +428,25 @@ enum TDB_ERROR delete_from_hash(struct tdb_context *tdb, struct hash_info *h);
 bool is_subhash(tdb_off_t val);
 
 /* free.c: */
-int tdb_ftable_init(struct tdb_context *tdb);
+enum TDB_ERROR tdb_ftable_init(struct tdb_context *tdb);
 
 /* check.c needs these to iterate through free lists. */
 tdb_off_t first_ftable(struct tdb_context *tdb);
 tdb_off_t next_ftable(struct tdb_context *tdb, tdb_off_t ftable);
 
-/* This returns space or TDB_OFF_ERR. */
+/* This returns space or -ve error number. */
 tdb_off_t alloc(struct tdb_context *tdb, size_t keylen, size_t datalen,
 		uint64_t hash, unsigned magic, bool growing);
 
 /* Put this record in a free list. */
-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);
 
 /* Set up header for a used/ftable/htable/chain record. */
-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);
 
 /* Used by tdb_check to verify. */
 unsigned int size_to_bucket(tdb_len_t data_len);

ccan/tdb2/tdb.c

@@ -117,9 +117,13 @@ static int tdb_new_database(struct tdb_context *tdb,
 	/* Free is empty. */
 	newdb.hdr.free_table = offsetof(struct new_database, ftable);
 	memset(&newdb.ftable, 0, sizeof(newdb.ftable));
-	set_header(NULL, &newdb.ftable.hdr, TDB_FTABLE_MAGIC, 0,
-		   sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
-		   sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr), 0);
+	tdb->ecode = set_header(NULL, &newdb.ftable.hdr, TDB_FTABLE_MAGIC, 0,
+				sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
+				sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
+				0);
+	if (tdb->ecode != TDB_SUCCESS) {
+		return -1;
+	}
 
 	/* Magic food */
 	memset(newdb.hdr.magic_food, 0, sizeof(newdb.hdr.magic_food));
@@ -354,8 +358,10 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 		}
 	}
 
-	if (tdb_ftable_init(tdb) == -1)
+	tdb->ecode = tdb_ftable_init(tdb);
+	if (tdb->ecode != TDB_SUCCESS) {
 		goto fail;
+	}
 
 	tdb->next = tdbs;
 	tdbs = tdb;
@@ -415,9 +421,12 @@ static int update_rec_hdr(struct tdb_context *tdb,
 	uint64_t dataroom = rec_data_length(rec) + rec_extra_padding(rec);
 	enum TDB_ERROR ecode;
 
-	if (set_header(tdb, rec, TDB_USED_MAGIC, keylen, datalen,
-		       keylen + dataroom, h))
+	ecode = set_header(tdb, rec, TDB_USED_MAGIC, keylen, datalen,
+			   keylen + dataroom, h);
+	if (ecode != TDB_SUCCESS) {
+		tdb->ecode = ecode;
 		return -1;
+	}
 
 	ecode = tdb_write_convert(tdb, off, rec, sizeof(*rec));
 	if (ecode != TDB_SUCCESS) {
@@ -440,16 +449,19 @@ static int replace_data(struct tdb_context *tdb,
 	/* Allocate a new record. */
 	new_off = alloc(tdb, key.dsize, dbuf.dsize, h->h, TDB_USED_MAGIC,
 			growing);
-	if (unlikely(new_off == TDB_OFF_ERR))
+	if (TDB_OFF_IS_ERR(new_off)) {
+		tdb->ecode = new_off;
 		return -1;
+	}
 
 	/* We didn't like the existing one: remove it. */
 	if (old_off) {
 		add_stat(tdb, frees, 1);
-		add_free_record(tdb, old_off,
-				sizeof(struct tdb_used_record)
-				+ key.dsize + old_room);
-		ecode = replace_in_hash(tdb, h, new_off);
+		ecode = add_free_record(tdb, old_off,
+					sizeof(struct tdb_used_record)
+					+ key.dsize + old_room);
+		if (ecode == TDB_SUCCESS)
+			ecode = replace_in_hash(tdb, h, new_off);
 	} else {
 		ecode = add_to_hash(tdb, h, new_off);
 	}
@@ -676,12 +688,15 @@ int tdb_delete(struct tdb_context *tdb, struct tdb_data key)
 
 	/* Free the deleted entry. */
 	add_stat(tdb, frees, 1);
-	if (add_free_record(tdb, off,
-			    sizeof(struct tdb_used_record)
-			    + rec_key_length(&rec)
-			    + rec_data_length(&rec)
-			    + rec_extra_padding(&rec)) != 0)
+	ecode = add_free_record(tdb, off,
+				sizeof(struct tdb_used_record)
+				+ rec_key_length(&rec)
+				+ rec_data_length(&rec)
+				+ rec_extra_padding(&rec));
+	if (ecode != TDB_SUCCESS) {
+		tdb->ecode = ecode;
 		goto unlock_err;
+	}
 
 	tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
 	return 0;

ccan/tdb2/test/run-01-new_database.c

@@ -11,8 +11,8 @@
 #include "logging.h"
 
 /* FIXME: Check these! */
-#define INITIAL_TDB_MALLOC	"tdb.c", 178, FAILTEST_MALLOC
-#define LOGGING_MALLOC		"tdb.c", 734, FAILTEST_MALLOC
+#define INITIAL_TDB_MALLOC	"tdb.c", 182, FAILTEST_MALLOC
+#define LOGGING_MALLOC		"tdb.c", 792, FAILTEST_MALLOC
 #define URANDOM_OPEN		"tdb.c", 49, FAILTEST_OPEN
 #define URANDOM_READ		"tdb.c", 29, FAILTEST_READ
 

ccan/tdb2/test/run-04-basichash.c

@@ -67,7 +67,7 @@ int main(int argc, char *argv[])
 		/* Allocate a new record. */
 		new_off = alloc(tdb, key.dsize, dbuf.dsize, h.h,
 				TDB_USED_MAGIC, false);
-		ok1(new_off != TDB_OFF_ERR);
+		ok1(!TDB_OFF_IS_ERR(new_off));
 
 		/* We should be able to add it now. */
 		ok1(add_to_hash(tdb, &h, new_off) == 0);
@@ -228,7 +228,7 @@ int main(int argc, char *argv[])
 		/* Allocate a new record. */
 		new_off = alloc(tdb, key.dsize, dbuf.dsize, h.h,
 				TDB_USED_MAGIC, false);
-		ok1(new_off != TDB_OFF_ERR);
+		ok1(!TDB_OFF_IS_ERR(new_off));
 		ok1(add_to_hash(tdb, &h, new_off) == 0);
 
 		/* Make sure we fill it in for later finding. */

ccan/tdb2/transaction.c

@@ -681,9 +681,10 @@ static int tdb_recovery_allocate(struct tdb_context *tdb,
 	   the transaction) */
 	if (recovery_head != 0) {
 		add_stat(tdb, frees, 1);
-		if (add_free_record(tdb, recovery_head,
-				    sizeof(rec) + rec.max_len) != 0) {
-			tdb_logerr(tdb, tdb->ecode, TDB_LOG_ERROR,
+		ecode = add_free_record(tdb, recovery_head,
+					sizeof(rec) + rec.max_len);
+		if (ecode != TDB_SUCCESS) {
+			tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
 				   "tdb_recovery_allocate:"
 				   " failed to free previous recovery area");
 			return -1;