[Issue #203] error out if FIO_FDMAX is exceeded in fio_opendir

Author: gsmolk

src/utils/file.c

@@ -262,7 +262,8 @@ DIR* fio_opendir(char const* path, fio_location location)
 		mask = fio_fdset;
 		for (i = 0; (mask & 1) != 0; i++, mask >>= 1);
 		if (i == FIO_FDMAX) {
-			return NULL;
+			elog(ERROR, "FIO_FDMAX is exceeded in fio_opendir, "
+					"probably too many remote directories has been opened");
 		}
 		hdr.cop = FIO_OPENDIR;
 		hdr.handle = i;
@@ -277,6 +278,7 @@ DIR* fio_opendir(char const* path, fio_location location)
 		if (hdr.arg != 0)
 		{
 			errno = hdr.arg;
+			fio_fdset &= ~(1 << hdr.handle);
 			return NULL;
 		}
 		dir = (DIR*)(size_t)(i + 1);
@@ -349,7 +351,8 @@ int fio_open(char const* path, int mode, fio_location location)
 		mask = fio_fdset;
 		for (i = 0; (mask & 1) != 0; i++, mask >>= 1);
 		if (i == FIO_FDMAX)
-			elog(ERROR, "FIO_FDMAX is exceeded, probably too many remote files has been opened");
+			elog(ERROR, "FIO_FDMAX is exceeded in fio_open, "
+					"probably too many remote files has been opened");
 
 		hdr.cop = FIO_OPEN;
 		hdr.handle = i;