X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb%2Fopen.c;h=8b9776864a6729a5a85bcfe470c73c709db45364;hp=a5cf47e7249606ec72093f13f148adcbeb393566;hb=dea5ab34a93218e9b7c6eb7d03ca89cfdc0a4634;hpb=e1f11b7b1e39ceb092155ba742b34f0785d88d06

diff --git a/ccan/tdb/open.c b/ccan/tdb/open.c
index a5cf47e7..8b977686 100644
--- a/ccan/tdb/open.c
+++ b/ccan/tdb/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;
@@ -153,9 +155,6 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 	unsigned char *vp;
 	uint32_t vertest;
 	unsigned v;
-#ifdef TDB_TRACE
-	char tracefile[strlen(name) + 32];
-#endif
 
 	if (!(tdb = (struct tdb_context *)calloc(1, sizeof *tdb))) {
 		/* Can't log this */
@@ -163,15 +162,6 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 		goto fail;
 	}
 
-#ifdef TDB_TRACE
-	sprintf(tracefile, "%s.trace.%u", name, getpid());
-	tdb->tracefd = open(tracefile, O_WRONLY|O_CREAT|O_EXCL, 0600);
-	if (tdb->tracefd < 0)
-		goto fail;
-	tdb_trace(tdb, "tdb_open %s %u %#x %#x %p\n",
-		  name, hash_size, tdb_flags, open_flags, hash_fn);
-#endif
-
 	tdb_io_init(tdb);
 	tdb->fd = -1;
 	tdb->name = NULL;
@@ -218,6 +208,10 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 			TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: tdb_new_database failed!"));
 			goto fail;
 		}
+#ifdef TDB_TRACE
+		/* All tracing will fail.  That's ok. */
+		tdb->tracefd = -1;
+#endif
 		goto internal;
 	}
 
@@ -232,7 +226,7 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
         fcntl(tdb->fd, F_SETFD, v | FD_CLOEXEC);
 
 	/* ensure there is only one process initialising at once */
-	if (tdb->methods->tdb_brlock(tdb, GLOBAL_LOCK, F_WRLCK, F_SETLKW, 0, 1) == -1) {
+	if (tdb->methods->brlock(tdb, F_WRLCK, GLOBAL_LOCK, 1, TDB_LOCK_WAIT) == -1) {
 		TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: failed to get global lock on %s: %s\n",
 			 name, strerror(errno)));
 		goto fail;	/* errno set by tdb_brlock */
@@ -241,7 +235,7 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 	/* we need to zero database if we are the only one with it open */
 	if ((tdb_flags & TDB_CLEAR_IF_FIRST) &&
 	    (!tdb->read_only) &&
-	    (locked = (tdb->methods->tdb_brlock(tdb, ACTIVE_LOCK, F_WRLCK, F_SETLK, 0, 1) == 0))) {
+	    (locked = (tdb->methods->brlock(tdb, F_WRLCK, ACTIVE_LOCK, 1, TDB_LOCK_NOWAIT|TDB_LOCK_PROBE) == 0))) {
 		open_flags |= O_CREAT;
 		if (ftruncate(tdb->fd, 0) == -1) {
 			TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_open_ex: "
@@ -253,17 +247,19 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 
 	errno = 0;
 	if (read(tdb->fd, &tdb->header, sizeof(tdb->header)) != sizeof(tdb->header)
-	    || strcmp(tdb->header.magic_food, TDB_MAGIC_FOOD) != 0
-	    || (tdb->header.version != TDB_VERSION
-		&& !(rev = (tdb->header.version==TDB_BYTEREV(TDB_VERSION))))) {
-		/* its not a valid database - possibly initialise it */
+	    || strcmp(tdb->header.magic_food, TDB_MAGIC_FOOD) != 0) {
 		if (!(open_flags & O_CREAT) || tdb_new_database(tdb, hash_size) == -1) {
 			if (errno == 0) {
-			errno = EIO; /* ie bad format or something */
+				errno = EIO; /* ie bad format or something */
 			}
 			goto fail;
 		}
 		rev = (tdb->flags & TDB_CONVERT);
+	} else if (tdb->header.version != TDB_VERSION
+		   && !(rev = (tdb->header.version==TDB_BYTEREV(TDB_VERSION)))) {
+		/* wrong version */
+		errno = EIO;
+		goto fail;
 	}
 	vp = (unsigned char *)&tdb->header.version;
 	vertest = (((uint32_t)vp[0]) << 24) | (((uint32_t)vp[1]) << 16) |
@@ -302,7 +298,7 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 	tdb->inode = st.st_ino;
 	tdb_mmap(tdb);
 	if (locked) {
-		if (tdb->methods->tdb_brlock(tdb, ACTIVE_LOCK, F_UNLCK, F_SETLK, 0, 1) == -1) {
+		if (tdb->methods->brunlock(tdb, F_WRLCK, ACTIVE_LOCK, 1) == -1) {
 			TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: "
 				 "failed to take ACTIVE_LOCK on %s: %s\n",
 				 name, strerror(errno)));
@@ -317,7 +313,7 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 
 	if (tdb_flags & TDB_CLEAR_IF_FIRST) {
 		/* leave this lock in place to indicate it's in use */
-		if (tdb->methods->tdb_brlock(tdb, ACTIVE_LOCK, F_RDLCK, F_SETLKW, 0, 1) == -1)
+		if (tdb->methods->brlock(tdb, F_RDLCK, ACTIVE_LOCK, 1, TDB_LOCK_WAIT) == -1)
 			goto fail;
 	}
 
@@ -326,11 +322,26 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 		goto fail;
 	}
 
+#ifdef TDB_TRACE
+	{
+		char tracefile[strlen(name) + 32];
+
+		sprintf(tracefile, "%s.trace.%u", name, getpid());
+		tdb->tracefd = open(tracefile, O_WRONLY|O_CREAT|O_EXCL, 0600);
+		if (tdb->tracefd >= 0) {
+			tdb_enable_seqnum(tdb);
+			tdb_trace_open(tdb, "tdb_open", hash_size, tdb_flags,
+				       open_flags);
+		} else
+			TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: failed to open trace file %s!\n", tracefile));
+	}
+#endif
+
  internal:
 	/* Internal (memory-only) databases skip all the code above to
 	 * do with disk files, and resume here by releasing their
 	 * global lock and hooking into the active list. */
-	if (tdb->methods->tdb_brlock(tdb, GLOBAL_LOCK, F_UNLCK, F_SETLKW, 0, 1) == -1)
+	if (tdb->methods->brunlock(tdb, F_WRLCK, GLOBAL_LOCK, 1) == -1)
 		goto fail;
 	tdb->next = tdbs;
 	tdbs = tdb;
@@ -342,8 +353,9 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 	if (!tdb)
 		return NULL;
 
+#ifdef TDB_TRACE
 	close(tdb->tracefd);
-	
+#endif
 	if (tdb->map_ptr) {
 		if (tdb->flags & TDB_INTERNAL)
 			SAFE_FREE(tdb->map_ptr);
@@ -379,10 +391,10 @@ int tdb_close(struct tdb_context *tdb)
 	struct tdb_context **i;
 	int ret = 0;
 
-	tdb_trace(tdb, "tdb_close");
 	if (tdb->transaction) {
 		tdb_transaction_cancel(tdb);
 	}
+	tdb_trace(tdb, "tdb_close");
 
 	if (tdb->map_ptr) {
 		if (tdb->flags & TDB_INTERNAL)
@@ -403,7 +415,9 @@ int tdb_close(struct tdb_context *tdb)
 		}
 	}
 
+#ifdef TDB_TRACE
 	close(tdb->tracefd);
+#endif
 	memset(tdb, 0, sizeof(*tdb));
 	SAFE_FREE(tdb);
 
@@ -454,7 +468,7 @@ int tdb_reopen(struct tdb_context *tdb)
 		goto fail;
 	}
 	if ((tdb->flags & TDB_CLEAR_IF_FIRST) && 
-	    (tdb->methods->tdb_brlock(tdb, ACTIVE_LOCK, F_RDLCK, F_SETLKW, 0, 1) == -1)) {
+	    (tdb->methods->brlock(tdb, F_RDLCK, ACTIVE_LOCK, 1, TDB_LOCK_WAIT) == -1)) {
 		TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: failed to obtain active lock\n"));
 		goto fail;
 	}