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From 7adcfacf9057c216beb99286e5f233e868865eae Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Tue, 21 Nov 2017 03:21:44 +0100
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Subject: [PATCH 1/9] block/linux-aio: fix memory and fd leak
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <20171121032145.5681-2-famz@redhat.com>
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Patchwork-id: 77766
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O-Subject: [RHEL-7.5 qemu-kvm PATCH v2 1/2] block/linux-aio: fix memory and fd leak
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Bugzilla: 1491434
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Hot unplugging -drive aio=native,file=test.img,format=raw images leaves
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the Linux AIO event notifier and struct qemu_laio_state allocated.
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Luckily nothing will use the event notifier after the BlockDriverState
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has been closed so the handler function is never called.
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It's still worth fixing this resource leak.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit abd269b7cf1f084a067731acb8f3272c193cb5f0)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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block/linux-aio.c
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* Context is different: downstream we don't have raw_detach_aio_context()
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in raw_close().
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* Downstream uses eventfd(2) instead of EventNotifier, so do close()
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directly here as well.
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---
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block/linux-aio.c | 9 +++++++++
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block/raw-aio.h | 1 +
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block/raw-posix.c | 6 ++++++
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3 files changed, 16 insertions(+)
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diff --git a/block/linux-aio.c b/block/linux-aio.c
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index 40041d1..43f14f3 100644
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--- a/block/linux-aio.c
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+++ b/block/linux-aio.c
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@@ -225,3 +225,12 @@ out_free_state:
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g_free(s);
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return NULL;
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}
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+
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+void laio_cleanup(void *s_)
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+{
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+ struct qemu_laio_state *s = s_;
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+
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+ qemu_aio_set_fd_handler(s->efd, NULL, NULL, NULL, NULL);
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+ close(s->efd);
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+ g_free(s);
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+}
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diff --git a/block/raw-aio.h b/block/raw-aio.h
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index 7ad0a8a..2dba2c6 100644
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--- a/block/raw-aio.h
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+++ b/block/raw-aio.h
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@@ -34,6 +34,7 @@
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/* linux-aio.c - Linux native implementation */
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#ifdef CONFIG_LINUX_AIO
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void *laio_init(void);
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+void laio_cleanup(void *s);
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BlockDriverAIOCB *laio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque, int type);
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diff --git a/block/raw-posix.c b/block/raw-posix.c
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index ed97bd4..c2b1be2 100644
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--- a/block/raw-posix.c
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+++ b/block/raw-posix.c
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@@ -1081,6 +1081,12 @@ static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
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static void raw_close(BlockDriverState *bs)
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{
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BDRVRawState *s = bs->opaque;
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+
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+#ifdef CONFIG_LINUX_AIO
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+ if (s->use_aio) {
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+ laio_cleanup(s->aio_ctx);
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+ }
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+#endif
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if (s->fd >= 0) {
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qemu_close(s->fd);
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s->fd = -1;
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--
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1.8.3.1
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