lib/tdb: wean off TDB_ERRCODE.

It was a regrettable hack which I used to reduce line count in tdb; in fact it caused confusion as can be seen in this patch.
In particular, ecode now needs to be set before TDB_LOG anyway, and having it exposed in
the header is useless (the struct tdb_context isn't defined, so it's doubly useless).
Also, we should never set errno, as io.c was doing.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

8 files changed, 59 insertions, 38 deletions

diff --git a/lib/tdb/common/freelist.c b/lib/tdb/common/freelist.c
index 3bc3965141..dedf78cf92 100644
--- a/lib/tdb/common/freelist.c
+++ b/lib/tdb/common/freelist.c
@@ -54,7 +54,7 @@ int tdb_rec_free_read(struct tdb_context *tdb, tdb_off_t off, struct list_struct
 		tdb->ecode = TDB_ERR_CORRUPT;
 		TDB_LOG((tdb, TDB_DEBUG_WARNING, "tdb_rec_free_read bad magic 0x%x at offset=%d\n", 
 			   rec->magic, off));
-		return TDB_ERRCODE(TDB_ERR_CORRUPT, -1);
+		return -1;
 	}
 	if (tdb->methods->tdb_oob(tdb, rec->next+sizeof(*rec), 0) != 0)
 		return -1;
@@ -78,8 +78,9 @@ static int remove_from_freelist(struct tdb_context *tdb, tdb_off_t off, tdb_off_
 		/* Follow chain (next offset is at start of record) */
 		last_ptr = i;
 	}
+	tdb->ecode = TDB_ERR_CORRUPT;
 	TDB_LOG((tdb, TDB_DEBUG_FATAL,"remove_from_freelist: not on list at off=%d\n", off));
-	return TDB_ERRCODE(TDB_ERR_CORRUPT, -1);
+	return -1;
 }
 #endif
 
diff --git a/lib/tdb/common/freelistcheck.c b/lib/tdb/common/freelistcheck.c
index efc050df9c..972b2a41c4 100644
--- a/lib/tdb/common/freelistcheck.c
+++ b/lib/tdb/common/freelistcheck.c
@@ -67,7 +67,8 @@ int tdb_validate_freelist(struct tdb_context *tdb, int *pnum_entries)
 
 	/* Store the FREELIST_TOP record. */
 	if (seen_insert(mem_tdb, last_ptr) == -1) {
-		ret = TDB_ERRCODE(TDB_ERR_CORRUPT, -1);
+		tdb->ecode = TDB_ERR_CORRUPT;
+		ret = -1;
 		goto fail;
 	}
 
@@ -83,7 +84,8 @@ int tdb_validate_freelist(struct tdb_context *tdb, int *pnum_entries)
 		   be corrupt. */
 
 		if (seen_insert(mem_tdb, rec_ptr)) {
-			ret = TDB_ERRCODE(TDB_ERR_CORRUPT, -1);
+			tdb->ecode = TDB_ERR_CORRUPT;
+			ret = -1;
 			goto fail;
 		}
 
diff --git a/lib/tdb/common/io.c b/lib/tdb/common/io.c
index a0b3a3f24a..cc52bcfd69 100644
--- a/lib/tdb/common/io.c
+++ b/lib/tdb/common/io.c
@@ -45,11 +45,12 @@ static int tdb_oob(struct tdb_context *tdb, tdb_off_t len, int probe)
 			TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_oob len %d beyond internal malloc size %d\n",
 				 (int)len, (int)tdb->map_size));
 		}
-		return TDB_ERRCODE(TDB_ERR_IO, -1);
+		return -1;
 	}
 
 	if (fstat(tdb->fd, &st) == -1) {
-		return TDB_ERRCODE(TDB_ERR_IO, -1);
+		tdb->ecode = TDB_ERR_IO;
+		return -1;
 	}
 
 	if (st.st_size < (size_t)len) {
@@ -59,12 +60,14 @@ static int tdb_oob(struct tdb_context *tdb, tdb_off_t len, int probe)
 			TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_oob len %d beyond eof at %d\n",
 				 (int)len, (int)st.st_size));
 		}
-		return TDB_ERRCODE(TDB_ERR_IO, -1);
+		return -1;
 	}
 
 	/* Unmap, update size, remap */
-	if (tdb_munmap(tdb) == -1)
-		return TDB_ERRCODE(TDB_ERR_IO, -1);
+	if (tdb_munmap(tdb) == -1) {
+		tdb->ecode = TDB_ERR_IO;
+		return -1;
+	}
 	tdb->map_size = st.st_size;
 	tdb_mmap(tdb);
 	return 0;
@@ -92,27 +95,27 @@ static int tdb_write(struct tdb_context *tdb, tdb_off_t off,
 		ssize_t written = pwrite(tdb->fd, buf, len, off);
 		if ((written != (ssize_t)len) && (written != -1)) {
 			/* try once more */
+			tdb->ecode = TDB_ERR_IO;
 			TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_write: wrote only "
 				 "%d of %d bytes at %d, trying once more\n",
 				 (int)written, len, off));
-			errno = ENOSPC;
-			written = pwrite(tdb->fd, (const void *)((const char *)buf+written),
+			written = pwrite(tdb->fd, (const char *)buf+written,
 					 len-written,
 					 off+written);
 		}
 		if (written == -1) {
-		/* Ensure ecode is set for log fn. */
-		tdb->ecode = TDB_ERR_IO;
+			/* Ensure ecode is set for log fn. */
+			tdb->ecode = TDB_ERR_IO;
 			TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_write failed at %d "
 				 "len=%d (%s)\n", off, len, strerror(errno)));
-			return TDB_ERRCODE(TDB_ERR_IO, -1);
+			return -1;
 		} else if (written != (ssize_t)len) {
+			tdb->ecode = TDB_ERR_IO;
 			TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_write: failed to "
 				 "write %d bytes at %d in two attempts\n",
 				 len, off));
-			errno = ENOSPC;
-		return TDB_ERRCODE(TDB_ERR_IO, -1);
-	}
+			return -1;
+		}
 	}
 	return 0;
 }
@@ -146,7 +149,7 @@ static int tdb_read(struct tdb_context *tdb, tdb_off_t off, void *buf,
 				 "len=%d ret=%d (%s) map_size=%d\n",
 				 (int)off, (int)len, (int)ret, strerror(errno),
 				 (int)tdb->map_size));
-			return TDB_ERRCODE(TDB_ERR_IO, -1);
+			return -1;
 		}
 	}
 	if (cv) {
@@ -389,7 +392,7 @@ unsigned char *tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset, tdb_len
 		tdb->ecode = TDB_ERR_OOM;
 		TDB_LOG((tdb, TDB_DEBUG_ERROR,"tdb_alloc_read malloc failed len=%d (%s)\n",
 			   len, strerror(errno)));
-		return TDB_ERRCODE(TDB_ERR_OOM, buf);
+		return NULL;
 	}
 	if (tdb->methods->tdb_read(tdb, offset, buf, len, 0) == -1) {
 		SAFE_FREE(buf);
@@ -441,7 +444,7 @@ int tdb_rec_read(struct tdb_context *tdb, tdb_off_t offset, struct list_struct *
 		/* Ensure ecode is set for log fn. */
 		tdb->ecode = TDB_ERR_CORRUPT;
 		TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_rec_read bad magic 0x%x at offset=%d\n", rec->magic, offset));
-		return TDB_ERRCODE(TDB_ERR_CORRUPT, -1);
+		return -1;
 	}
 	return tdb->methods->tdb_oob(tdb, rec->next+sizeof(*rec), 0);
 }
diff --git a/lib/tdb/common/lock.c b/lib/tdb/common/lock.c
index 3414049cb6..0984e516ea 100644
--- a/lib/tdb/common/lock.c
+++ b/lib/tdb/common/lock.c
@@ -75,16 +75,15 @@ int tdb_brlock(struct tdb_context *tdb, tdb_off_t offset,
 	} while (ret == -1 && errno == EINTR);
 
 	if (ret == -1) {
+		tdb->ecode = TDB_ERR_LOCK;
 		/* Generic lock error. errno set by fcntl.
 		 * EAGAIN is an expected return from non-blocking
 		 * locks. */
 		if (!probe && lck_type != F_SETLK) {
-			/* Ensure error code is set for log fun to examine. */
-			tdb->ecode = TDB_ERR_LOCK;
 			TDB_LOG((tdb, TDB_DEBUG_TRACE,"tdb_brlock failed (fd=%d) at offset %d rw_type=%d lck_type=%d len=%d\n", 
 				 tdb->fd, offset, rw_type, lck_type, (int)len));
 		}
-		return TDB_ERRCODE(TDB_ERR_LOCK, -1);
+		return -1;
 	}
 	return 0;
 }
@@ -133,10 +132,12 @@ static int _tdb_lock(struct tdb_context *tdb, int list, int ltype, int op)
 	}
 
 	if (tdb->global_lock.count) {
-		return TDB_ERRCODE(TDB_ERR_LOCK, -1);
+		tdb->ecode = TDB_ERR_LOCK;
+		return -1;
 	}
 
 	if (list < -1 || list >= (int)tdb->header.hash_size) {
+		tdb->ecode = TDB_ERR_LOCK;
 		TDB_LOG((tdb, TDB_DEBUG_ERROR,"tdb_lock: invalid list %d for ltype=%d\n", 
 			   list, ltype));
 		return -1;
@@ -228,7 +229,8 @@ int tdb_unlock(struct tdb_context *tdb, int list, int ltype)
 	}
 
 	if (tdb->global_lock.count) {
-		return TDB_ERRCODE(TDB_ERR_LOCK, -1);
+		tdb->ecode = TDB_ERR_LOCK;
+		return -1;
 	}
 
 	if (tdb->flags & TDB_NOLOCK)
@@ -350,8 +352,10 @@ static int _tdb_lockall(struct tdb_context *tdb, int ltype, int op)
 	ltype &= ~TDB_MARK_LOCK;
 
 	/* There are no locks on read-only dbs */
-	if (tdb->read_only || tdb->traverse_read)
-		return TDB_ERRCODE(TDB_ERR_LOCK, -1);
+	if (tdb->read_only || tdb->traverse_read) {
+		tdb->ecode = TDB_ERR_LOCK;
+		return -1;
+	}
 
 	if (tdb->global_lock.count && tdb->global_lock.ltype == ltype) {
 		tdb->global_lock.count++;
@@ -360,12 +364,14 @@ static int _tdb_lockall(struct tdb_context *tdb, int ltype, int op)
 
 	if (tdb->global_lock.count) {
 		/* a global lock of a different type exists */
-		return TDB_ERRCODE(TDB_ERR_LOCK, -1);
+		tdb->ecode = TDB_ERR_LOCK;
+		return -1;
 	}
 	
 	if (tdb->num_locks != 0) {
 		/* can't combine global and chain locks */
-		return TDB_ERRCODE(TDB_ERR_LOCK, -1);
+		tdb->ecode = TDB_ERR_LOCK;
+		return -1;
 	}
 
 	if (!mark_lock &&
@@ -394,11 +400,13 @@ static int _tdb_unlockall(struct tdb_context *tdb, int ltype)
 
 	/* There are no locks on read-only dbs */
 	if (tdb->read_only || tdb->traverse_read) {
-		return TDB_ERRCODE(TDB_ERR_LOCK, -1);
+		tdb->ecode = TDB_ERR_LOCK;
+		return -1;
 	}
 
 	if (tdb->global_lock.ltype != ltype || tdb->global_lock.count == 0) {
-		return TDB_ERRCODE(TDB_ERR_LOCK, -1);
+		tdb->ecode = TDB_ERR_LOCK;
+		return -1;
 	}
 
 	if (tdb->global_lock.count > 1) {
diff --git a/lib/tdb/common/open.c b/lib/tdb/common/open.c
index f0061d7b31..1ba2e7bd11 100644
--- a/lib/tdb/common/open.c
+++ b/lib/tdb/common/open.c
@@ -55,8 +55,10 @@ static int tdb_new_database(struct tdb_context *tdb, int hash_size)
 
 	/* We make it up in memory, then write it out if not internal */
 	size = sizeof(struct tdb_header) + (hash_size+1)*sizeof(tdb_off_t);
-	if (!(newdb = (struct tdb_header *)calloc(size, 1)))
-		return TDB_ERRCODE(TDB_ERR_OOM, -1);
+	if (!(newdb = (struct tdb_header *)calloc(size, 1))) {
+		tdb->ecode = TDB_ERR_OOM;
+		return -1;
+	}
 
 	/* Fill in the header */
 	newdb->version = TDB_VERSION;
diff --git a/lib/tdb/common/tdb.c b/lib/tdb/common/tdb.c
index 7acc111cd8..7ee0bb7300 100644
--- a/lib/tdb/common/tdb.c
+++ b/lib/tdb/common/tdb.c
@@ -98,12 +98,14 @@ static tdb_off_t tdb_find(struct tdb_context *tdb, TDB_DATA key, uint32_t hash,
 		}
 		/* detect tight infinite loop */
 		if (rec_ptr == r->next) {
+			tdb->ecode = TDB_ERR_CORRUPT;
 			TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_find: loop detected.\n"));
-			return TDB_ERRCODE(TDB_ERR_CORRUPT, 0);
+			return 0;
 		}
 		rec_ptr = r->next;
 	}
-	return TDB_ERRCODE(TDB_ERR_NOEXIST, 0);
+	tdb->ecode = TDB_ERR_NOEXIST;
+	return 0;
 }
 
 /* As tdb_find, but if you succeed, keep the lock */
@@ -216,7 +218,8 @@ int tdb_parse_record(struct tdb_context *tdb, TDB_DATA key,
 
 	if (!(rec_ptr = tdb_find_lock_hash(tdb,key,hash,F_RDLCK,&rec))) {
 		tdb_trace_1rec_ret(tdb, "tdb_parse_record", key, -1);
-		return TDB_ERRCODE(TDB_ERR_NOEXIST, 0);
+		tdb->ecode = TDB_ERR_NOEXIST;
+		return 0;
 	}
 	tdb_trace_1rec_ret(tdb, "tdb_parse_record", key, 0);
 
diff --git a/lib/tdb/common/transaction.c b/lib/tdb/common/transaction.c
index 7285513430..16e12d6470 100644
--- a/lib/tdb/common/transaction.c
+++ b/lib/tdb/common/transaction.c
@@ -372,7 +372,8 @@ static int transaction_oob(struct tdb_context *tdb, tdb_off_t len, int probe)
 	if (len <= tdb->map_size) {
 		return 0;
 	}
-	return TDB_ERRCODE(TDB_ERR_IO, -1);
+	tdb->ecode = TDB_ERR_IO;
+	return -1;
 }
 
 /*
diff --git a/lib/tdb/common/traverse.c b/lib/tdb/common/traverse.c
index 3c88c87143..8d808206f9 100644
--- a/lib/tdb/common/traverse.c
+++ b/lib/tdb/common/traverse.c
@@ -125,7 +125,8 @@ static tdb_off_t tdb_next_lock(struct tdb_context *tdb, struct tdb_traverse_lock
 		want_next = 0;
 	}
 	/* We finished iteration without finding anything */
-	return TDB_ERRCODE(TDB_SUCCESS, 0);
+	tdb->ecode = TDB_SUCCESS;
+	return 0;
 
  fail:
 	tlock->off = 0;