X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb%2Fopen.c;h=bfa26dec58fd256db124fcd18ca9c50598ea4fe7;hp=77c6936fc2f5bac28b6c421f3d61f730cba71129;hb=a879e3e2859e17496f29e14b8f393583b2c93f19;hpb=110b06ab28f2c40baf0f5014bd8d4e468bcba2ba

diff --git a/ccan/tdb/open.c b/ccan/tdb/open.c
index 77c6936f..bfa26dec 100644
--- a/ccan/tdb/open.c
+++ b/ccan/tdb/open.c
@@ -161,7 +161,6 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 		errno = ENOMEM;
 		goto fail;
 	}
-
 	tdb_io_init(tdb);
 	tdb->fd = -1;
 #ifdef TDB_TRACE
@@ -203,6 +202,22 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 		tdb->flags &= ~TDB_CLEAR_IF_FIRST;
 	}
 
+	if ((tdb->flags & TDB_ALLOW_NESTING) &&
+	    (tdb->flags & TDB_DISALLOW_NESTING)) {
+		tdb->ecode = TDB_ERR_NESTING;
+		TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_open_ex: "
+			"allow_nesting and disallow_nesting are not allowed together!"));
+		errno = EINVAL;
+		goto fail;
+	}
+
+	/*
+	 * TDB_DISALLOW_NESTING is the default behavior.
+	 */
+	if (!(tdb->flags & TDB_ALLOW_NESTING)) {
+		tdb->flags |= TDB_DISALLOW_NESTING;
+	}
+
 	/* internal databases don't mmap or lock, and start off cleared */
 	if (tdb->flags & TDB_INTERNAL) {
 		tdb->flags |= (TDB_NOLOCK | TDB_NOMMAP);
@@ -225,8 +240,8 @@ 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->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",
+	if (tdb_nest_lock(tdb, OPEN_LOCK, F_WRLCK, TDB_LOCK_WAIT) == -1) {
+		TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: failed to get open lock on %s: %s\n",
 			 name, strerror(errno)));
 		goto fail;	/* errno set by tdb_brlock */
 	}
@@ -234,7 +249,7 @@ 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->brlock(tdb, F_WRLCK, ACTIVE_LOCK, 1, TDB_LOCK_NOWAIT|TDB_LOCK_PROBE) == 0))) {
+	    (locked = (tdb_nest_lock(tdb, ACTIVE_LOCK, F_WRLCK, 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: "
@@ -297,7 +312,7 @@ 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->brunlock(tdb, F_WRLCK, ACTIVE_LOCK, 1) == -1) {
+		if (tdb_nest_unlock(tdb, ACTIVE_LOCK, F_WRLCK, false) == -1) {
 			TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: "
 				 "failed to take ACTIVE_LOCK on %s: %s\n",
 				 name, strerror(errno)));
@@ -312,8 +327,9 @@ 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->brlock(tdb, F_RDLCK, ACTIVE_LOCK, 1, TDB_LOCK_WAIT) == -1)
+		if (tdb_nest_lock(tdb, ACTIVE_LOCK, F_RDLCK, TDB_LOCK_WAIT) == -1) {
 			goto fail;
+		}
 	}
 
 	/* if needed, run recovery */
@@ -325,7 +341,8 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 	{
 		char tracefile[strlen(name) + 32];
 
-		sprintf(tracefile, "%s.trace.%u", name, getpid());
+		snprintf(tracefile, sizeof(tracefile),
+			 "%s.trace.%li", name, (long)getpid());
 		tdb->tracefd = open(tracefile, O_WRONLY|O_CREAT|O_EXCL, 0600);
 		if (tdb->tracefd >= 0) {
 			tdb_enable_seqnum(tdb);
@@ -339,9 +356,10 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
  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->brunlock(tdb, F_WRLCK, GLOBAL_LOCK, 1) == -1)
+	 * open lock and hooking into the active list. */
+	if (tdb_nest_unlock(tdb, OPEN_LOCK, F_WRLCK, false) == -1) {
 		goto fail;
+	}
 	tdb->next = tdbs;
 	tdbs = tdb;
 	return tdb;
@@ -365,6 +383,7 @@ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
 	if (tdb->fd != -1)
 		if (close(tdb->fd) != 0)
 			TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: failed to close tdb->fd on error!\n"));
+	SAFE_FREE(tdb->lockrecs);
 	SAFE_FREE(tdb);
 	errno = save_errno;
 	return NULL;
@@ -437,9 +456,7 @@ void *tdb_get_logging_private(struct tdb_context *tdb)
 	return tdb->log.log_private;
 }
 
-/* reopen a tdb - this can be used after a fork to ensure that we have an independent
-   seek pointer from our parent and to re-establish locks */
-int tdb_reopen(struct tdb_context *tdb)
+static int tdb_reopen_internal(struct tdb_context *tdb, bool active_lock)
 {
 	struct stat st;
 
@@ -447,7 +464,7 @@ int tdb_reopen(struct tdb_context *tdb)
 		return 0; /* Nothing to do. */
 	}
 
-	if (tdb->num_locks != 0 || tdb->global_lock.count) {
+	if (tdb_have_extra_locks(tdb)) {
 		TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_reopen: reopen not allowed with locks held\n"));
 		goto fail;
 	}
@@ -468,11 +485,6 @@ int tdb_reopen(struct tdb_context *tdb)
 		TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: open failed (%s)\n", strerror(errno)));
 		goto fail;
 	}
-	if ((tdb->flags & TDB_CLEAR_IF_FIRST) && 
-	    (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;
-	}
 	if (fstat(tdb->fd, &st) != 0) {
 		TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: fstat failed (%s)\n", strerror(errno)));
 		goto fail;
@@ -483,6 +495,15 @@ int tdb_reopen(struct tdb_context *tdb)
 	}
 	tdb_mmap(tdb);
 
+	/* We may still think we hold the active lock. */
+	tdb->num_lockrecs = 0;
+	SAFE_FREE(tdb->lockrecs);
+
+	if (active_lock && tdb_nest_lock(tdb, ACTIVE_LOCK, F_RDLCK, TDB_LOCK_WAIT) == -1) {
+		TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_reopen: failed to obtain active lock\n"));
+		goto fail;
+	}
+
 	return 0;
 
 fail:
@@ -490,12 +511,21 @@ fail:
 	return -1;
 }
 
+/* reopen a tdb - this can be used after a fork to ensure that we have an independent
+   seek pointer from our parent and to re-establish locks */
+int tdb_reopen(struct tdb_context *tdb)
+{
+	return tdb_reopen_internal(tdb, tdb->flags & TDB_CLEAR_IF_FIRST);
+}
+
 /* reopen all tdb's */
 int tdb_reopen_all(int parent_longlived)
 {
 	struct tdb_context *tdb;
 
 	for (tdb=tdbs; tdb; tdb = tdb->next) {
+		bool active_lock = (tdb->flags & TDB_CLEAR_IF_FIRST);
+
 		/*
 		 * If the parent is longlived (ie. a
 		 * parent daemon architecture), we know
@@ -509,10 +539,10 @@ int tdb_reopen_all(int parent_longlived)
 		 */
 		if (parent_longlived) {
 			/* Ensure no clear-if-first. */
-			tdb->flags &= ~TDB_CLEAR_IF_FIRST;
+			active_lock = false;
 		}
 
-		if (tdb_reopen(tdb) != 0)
+		if (tdb_reopen_internal(tdb, active_lock) != 0)
 			return -1;
 	}