114 lines
4.5 KiB
Diff
114 lines
4.5 KiB
Diff
From c05f0a720ff742af5c010f5ab2c0661a10cfa536 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Wed, 10 Oct 2018 20:08:36 +0100
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Subject: [PATCH 05/49] block: Use bdrv_do_drain_begin/end in bdrv_drain_all()
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20181010200843.6710-3-kwolf@redhat.com>
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Patchwork-id: 82585
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O-Subject: [RHEL-8 qemu-kvm PATCH 02/44] block: Use bdrv_do_drain_begin/end in bdrv_drain_all()
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Bugzilla: 1637976
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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bdrv_do_drain_begin/end() implement already everything that
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bdrv_drain_all_begin/end() need and currently still do manually: Disable
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external events, call parent drain callbacks, call block driver
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callbacks.
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It also does two more things:
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The first is incrementing bs->quiesce_counter. bdrv_drain_all() already
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stood out in the test case by behaving different from the other drain
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variants. Adding this is not only safe, but in fact a bug fix.
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The second is calling bdrv_drain_recurse(). We already do that later in
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the same function in a loop, so basically doing an early first iteration
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doesn't hurt.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 79ab8b21dc19c08adc407504e456ff64b9dacb66)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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block/io.c | 10 ++--------
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tests/test-bdrv-drain.c | 14 ++++----------
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2 files changed, 6 insertions(+), 18 deletions(-)
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diff --git a/block/io.c b/block/io.c
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index 7e0a169..230b551 100644
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--- a/block/io.c
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+++ b/block/io.c
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@@ -412,11 +412,8 @@ void bdrv_drain_all_begin(void)
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for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
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AioContext *aio_context = bdrv_get_aio_context(bs);
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- /* Stop things in parent-to-child order */
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aio_context_acquire(aio_context);
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- aio_disable_external(aio_context);
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- bdrv_parent_drained_begin(bs, NULL);
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- bdrv_drain_invoke(bs, true, true);
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+ bdrv_do_drained_begin(bs, true, NULL);
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aio_context_release(aio_context);
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if (!g_slist_find(aio_ctxs, aio_context)) {
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@@ -457,11 +454,8 @@ void bdrv_drain_all_end(void)
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for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
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AioContext *aio_context = bdrv_get_aio_context(bs);
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- /* Re-enable things in child-to-parent order */
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aio_context_acquire(aio_context);
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- bdrv_drain_invoke(bs, false, true);
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- bdrv_parent_drained_end(bs, NULL);
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- aio_enable_external(aio_context);
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+ bdrv_do_drained_end(bs, true, NULL);
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aio_context_release(aio_context);
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}
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}
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diff --git a/tests/test-bdrv-drain.c b/tests/test-bdrv-drain.c
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index dee0a10..f1276a1 100644
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--- a/tests/test-bdrv-drain.c
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+++ b/tests/test-bdrv-drain.c
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@@ -276,8 +276,7 @@ static void test_quiesce_common(enum drain_type drain_type, bool recursive)
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static void test_quiesce_drain_all(void)
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{
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- // XXX drain_all doesn't quiesce
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- //test_quiesce_common(BDRV_DRAIN_ALL, true);
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+ test_quiesce_common(BDRV_DRAIN_ALL, true);
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}
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static void test_quiesce_drain(void)
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@@ -319,12 +318,7 @@ static void test_nested(void)
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for (outer = 0; outer < DRAIN_TYPE_MAX; outer++) {
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for (inner = 0; inner < DRAIN_TYPE_MAX; inner++) {
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- /* XXX bdrv_drain_all() doesn't increase the quiesce_counter */
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- int bs_quiesce = (outer != BDRV_DRAIN_ALL) +
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- (inner != BDRV_DRAIN_ALL);
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- int backing_quiesce = (outer == BDRV_SUBTREE_DRAIN) +
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- (inner == BDRV_SUBTREE_DRAIN);
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- int backing_cb_cnt = (outer != BDRV_DRAIN) +
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+ int backing_quiesce = (outer != BDRV_DRAIN) +
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(inner != BDRV_DRAIN);
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g_assert_cmpint(bs->quiesce_counter, ==, 0);
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@@ -335,10 +329,10 @@ static void test_nested(void)
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do_drain_begin(outer, bs);
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do_drain_begin(inner, bs);
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- g_assert_cmpint(bs->quiesce_counter, ==, bs_quiesce);
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+ g_assert_cmpint(bs->quiesce_counter, ==, 2);
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g_assert_cmpint(backing->quiesce_counter, ==, backing_quiesce);
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g_assert_cmpint(s->drain_count, ==, 2);
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- g_assert_cmpint(backing_s->drain_count, ==, backing_cb_cnt);
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+ g_assert_cmpint(backing_s->drain_count, ==, backing_quiesce);
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do_drain_end(inner, bs);
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do_drain_end(outer, bs);
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--
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1.8.3.1
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