X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=ioengines.c;h=ab5b2245131fb1abb5d2e6b51a94227522e78991;hp=723f310d6e1bcb8d28a2e6f637212dcfa489f5f8;hb=43d768074375795e8d9565ba75cfd00228cc61df;hpb=2866c82d598e30604d8a92723c664ee6ced90fb0

diff --git a/ioengines.c b/ioengines.c
index 723f310d..ab5b2245 100644
--- a/ioengines.c
+++ b/ioengines.c
@@ -14,41 +14,206 @@
 #include <unistd.h>
 #include <string.h>
 #include <dlfcn.h>
+
 #include "fio.h"
 #include "os.h"
 
-struct ioengine_ops *load_ioengine(struct thread_data *td, char *name)
+static LIST_HEAD(engine_list);
+
+static int check_engine_ops(struct ioengine_ops *ops)
 {
-	char engine[16], engine_lib[256];
-	struct ioengine_ops *ops;
-	void *dlhandle;
+	if (ops->version != FIO_IOOPS_VERSION) {
+		log_err("bad ioops version %d (want %d)\n", ops->version, FIO_IOOPS_VERSION);
+		return 1;
+	}
+
+	/*
+	 * cpu thread doesn't need to provide anything
+	 */
+	if (ops->flags & FIO_CPUIO)
+		return 0;
 
-	strcpy(engine, name);
+	if (!ops->queue) {
+		log_err("%s: no queue handler\n", ops->name);
+		return 1;
+	}
 
 	/*
-	 * linux libaio has alias names, so convert to what we want
+	 * sync engines only need a ->queue()
 	 */
+	if (ops->flags & FIO_SYNCIO)
+		return 0;
+	
+	if (!ops->event) {
+		log_err("%s: no event handler\n", ops->name);
+		return 1;
+	}
+	if (!ops->getevents) {
+		log_err("%s: no getevents handler\n", ops->name);
+		return 1;
+	}
+	if (!ops->queue) {
+		log_err("%s: no queue handler\n", ops->name);
+		return 1;
+	}
+		
+	return 0;
+}
+
+void unregister_ioengine(struct ioengine_ops *ops)
+{
+	list_del(&ops->list);
+	INIT_LIST_HEAD(&ops->list);
+}
+
+void register_ioengine(struct ioengine_ops *ops)
+{
+	INIT_LIST_HEAD(&ops->list);
+	list_add_tail(&ops->list, &engine_list);
+}
+
+static struct ioengine_ops *find_ioengine(const char *name)
+{
+	struct ioengine_ops *ops;
+	struct list_head *entry;
+	char engine[16];
+
+	strncpy(engine, name, sizeof(engine) - 1);
+
 	if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
 		strcpy(engine, "libaio");
 
-	sprintf(engine_lib, "/usr/local/lib/fio/fio-engine-%s.o", engine);
+	list_for_each(entry, &engine_list) {
+		ops = list_entry(entry, struct ioengine_ops, list);
+		if (!strcmp(engine, ops->name))
+			return ops;
+	}
+
+	return NULL;
+}
+
+static struct ioengine_ops *dlopen_ioengine(struct thread_data *td,
+					    const char *engine_lib)
+{
+	struct ioengine_ops *ops;
+	void *dlhandle;
+
 	dlerror();
 	dlhandle = dlopen(engine_lib, RTLD_LAZY);
-	if (!dlhandle)
-		printf("bla: %s\n", dlerror());
+	if (!dlhandle) {
+		td_vmsg(td, -1, dlerror());
+		return NULL;
+	}
 
+	/*
+	 * Unlike the included modules, external engines should have a
+	 * non-static ioengine structure that we can reference.
+	 */
 	ops = dlsym(dlhandle, "ioengine");
-	if (!ops)
-		printf("get ops failed\n");
+	if (!ops) {
+		td_vmsg(td, -1, dlerror());
+		dlclose(dlhandle);
+		return NULL;
+	}
 
 	ops->dlhandle = dlhandle;
 	return ops;
 }
 
+struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name)
+{
+	struct ioengine_ops *ops, *ret;
+	char engine[16];
+
+	strncpy(engine, name, sizeof(engine) - 1);
+
+	/*
+	 * linux libaio has alias names, so convert to what we want
+	 */
+	if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
+		strcpy(engine, "libaio");
+
+	ops = find_ioengine(engine);
+	if (!ops)
+		ops = dlopen_ioengine(td, name);
+
+	if (!ops) {
+		log_err("fio: engine %s not loadable\n", name);
+		return NULL;
+	}
+
+	/*
+	 * Check that the required methods are there.
+	 */
+	if (check_engine_ops(ops))
+		return NULL;
+
+	ret = malloc(sizeof(*ret));
+	memcpy(ret, ops, sizeof(*ret));
+	ret->data = NULL;
+
+	return ret;
+}
+
 void close_ioengine(struct thread_data *td)
 {
 	if (td->io_ops->cleanup)
 		td->io_ops->cleanup(td);
 
-	dlclose(td->io_ops->dlhandle);
+	if (td->io_ops->dlhandle)
+		dlclose(td->io_ops->dlhandle);
+
+	free(td->io_ops);
+	td->io_ops = NULL;
+}
+
+int td_io_prep(struct thread_data *td, struct io_u *io_u)
+{
+	if (td->io_ops->prep)
+		return td->io_ops->prep(td, io_u);
+
+	return 0;
+}
+
+int td_io_getevents(struct thread_data *td, int min, int max,
+		    struct timespec *t)
+{
+	if (td->io_ops->getevents)
+		return td->io_ops->getevents(td, min, max, t);
+
+	return 0;
+}
+
+int td_io_queue(struct thread_data *td, struct io_u *io_u)
+{
+	int ret;
+
+	if (td->io_ops->flags & FIO_SYNCIO)
+		fio_gettime(&io_u->issue_time, NULL);
+
+	if (io_u->ddir != DDIR_SYNC)
+		td->io_issues[io_u->ddir]++;
+
+	ret = td->io_ops->queue(td, io_u);
+
+	if ((td->io_ops->flags & FIO_SYNCIO) == 0)
+		fio_gettime(&io_u->issue_time, NULL);
+
+	return ret;
+}
+
+int td_io_init(struct thread_data *td)
+{
+	if (td->io_ops->init)
+		return td->io_ops->init(td);
+
+	return 0;
+}
+
+int td_io_commit(struct thread_data *td)
+{
+	if (td->io_ops->commit)
+		return td->io_ops->commit(td);
+
+	return 0;
 }