fsdev: add IO throttle support to fsdev devices

This patchset adds the throttle support for the 9p-local driver.
For now this functionality can be enabled only through qemu cli options.
QMP interface and support to other drivers need further extensions.
To make it simple for other 9p drivers, the throttle code has been put in
separate files.

Signed-off-by: Pradeep Jagadeesh <pradeep.jagadeesh@huawei.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
(pass extra NULL CoMutex * argument to qemu_co_queue_wait(),
 added options to qemu-options.hx, Greg Kurz)
Signed-off-by: Greg Kurz <groug@kaod.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index d99abc4602..76c9247c77 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -3529,6 +3529,10 @@ int v9fs_device_realize_common(V9fsState *s, Error **errp)
         error_setg(errp, "share path %s is not a directory", fse->path);
         goto out;
     }
+
+    s->ctx.fst = &fse->fst;
+    fsdev_throttle_init(s->ctx.fst);
+
     v9fs_path_free(&path);
 
     rc = 0;
@@ -3549,6 +3553,7 @@ void v9fs_device_unrealize_common(V9fsState *s, Error **errp)
     if (s->ops->cleanup) {
         s->ops->cleanup(&s->ctx);
     }
+    fsdev_throttle_cleanup(s->ctx.fst);
     g_free(s->tag);
     g_free(s->ctx.fs_root);
 }