From: Dmitry Monakhov <dmonakhov@openvz.org>
Date: Wed, 19 Sep 2012 19:22:54 +0000 (+0400)
Subject: ioengine: allow several external ioengines
X-Git-Tag: fio-2.0.10~30
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=0abea0b7428f930d423640feb4472218b83b8eea

ioengine: allow several external ioengines

Currently only one external ioengine can be exported because
it use hardcoded 'ioengine' symbol, but if we allow external
modules to have ops symbol similar to it's name then several
extrnal engines become possible.

NOTE: Old linking layout preserved

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/ioengines.c b/ioengines.c
index b43374e7..c2a64cb0 100644
--- a/ioengines.c
+++ b/ioengines.c
@@ -104,7 +104,9 @@ static struct ioengine_ops *dlopen_ioengine(struct thread_data *td,
 	 * Unlike the included modules, external engines should have a
 	 * non-static ioengine structure that we can reference.
 	 */
-	ops = dlsym(dlhandle, "ioengine");
+	ops = dlsym(dlhandle, engine_lib);
+	if (!ops)
+		ops = dlsym(dlhandle, "ioengine");
 	if (!ops) {
 		td_vmsg(td, -1, dlerror(), "dlsym");
 		dlclose(dlhandle);