commit a1abf40d6be2fc4b40d90ae3b46442f4a671776b
author Gonglei <arei.gonglei@huawei.com> Sat Jul 12 11:43:37 2014 +0800
committer Stefan Hajnoczi <stefanha@redhat.com> Tue Jul 15 15:34:13 2014 +0200
tree 79e3f7b3c9b0ed4e1d1abeab52a6b4d0f46a3b38
parent 7a6d04e73fdd571234e05dcad96895fafb3f22f0

linux-aio: Fix laio resource leak

when hotplug virtio-scsi disks using laio, the aio_nr will
increase in laio_init() by io_setup(), we can see the number by
  # cat /proc/sys/fs/aio-nr
  128
if the aio_nr attach the maxnum, which found from
  # cat /proc/sys/fs/aio-max-nr
  65536
the hotplug process will fail because of aio context leak.

Fix it by io_destroy in laio_cleanup().

Reported-by: daifulai <daifulai@huawei.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

block/linux-aio.c

diff --git a/block/linux-aio.c b/block/linux-aio.c
index 4867369..7ac7e8c 100644
--- a/block/linux-aio.c
+++ b/block/linux-aio.c
@@ -310,5 +310,10 @@
     struct qemu_laio_state *s = s_;
 
     event_notifier_cleanup(&s->e);
+
+    if (io_destroy(s->ctx) != 0) {
+        fprintf(stderr, "%s: destroy AIO context %p failed\n",
+                        __func__, &s->ctx);
+    }
     g_free(s);
 }