* [PATCH v2 0/2] block: bdrv_reopen() with backing file in different AioContext
@ 2020-03-06 14:14 Kevin Wolf
2020-03-06 14:14 ` [PATCH v2 1/2] iotests: Refactor blockdev-reopen test for iothreads Kevin Wolf
2020-03-06 14:14 ` [PATCH v2 2/2] block: bdrv_reopen() with backing file in different AioContext Kevin Wolf
0 siblings, 2 replies; 5+ messages in thread
From: Kevin Wolf @ 2020-03-06 14:14 UTC (permalink / raw)
To: qemu-block; +Cc: kwolf, pkrempa, berto, qemu-devel, mreitz
v2:
- Fix bdrv_reopen_can_attach() call [Berto]
Kevin Wolf (2):
iotests: Refactor blockdev-reopen test for iothreads
block: bdrv_reopen() with backing file in different AioContext
block.c | 32 ++++++++++++++++++++++-----
tests/qemu-iotests/245 | 45 +++++++++++++++++++++++++++++---------
tests/qemu-iotests/245.out | 4 ++--
3 files changed, 63 insertions(+), 18 deletions(-)
--
2.20.1
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 1/2] iotests: Refactor blockdev-reopen test for iothreads
2020-03-06 14:14 [PATCH v2 0/2] block: bdrv_reopen() with backing file in different AioContext Kevin Wolf
@ 2020-03-06 14:14 ` Kevin Wolf
2020-03-12 22:47 ` John Snow
2020-03-06 14:14 ` [PATCH v2 2/2] block: bdrv_reopen() with backing file in different AioContext Kevin Wolf
1 sibling, 1 reply; 5+ messages in thread
From: Kevin Wolf @ 2020-03-06 14:14 UTC (permalink / raw)
To: qemu-block; +Cc: kwolf, pkrempa, berto, qemu-devel, mreitz
We'll want to test more than one successful case in the future, so
prepare the test for that by a refactoring that runs each scenario in a
separate VM.
test_iothreads_switch_{backing,overlay} currently produce errors, but
these are cases that should actually work, by switching either the
backing file node or the overlay node to the AioContext of the other
node.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
---
tests/qemu-iotests/245 | 47 ++++++++++++++++++++++++++++++--------
tests/qemu-iotests/245.out | 4 ++--
2 files changed, 39 insertions(+), 12 deletions(-)
diff --git a/tests/qemu-iotests/245 b/tests/qemu-iotests/245
index 489bf78bd0..7d9eb6285c 100755
--- a/tests/qemu-iotests/245
+++ b/tests/qemu-iotests/245
@@ -970,8 +970,7 @@ class TestBlockdevReopen(iotests.QMPTestCase):
self.assertEqual(self.get_node('hd1'), None)
self.assert_qmp(self.get_node('hd2'), 'ro', True)
- # We don't allow setting a backing file that uses a different AioContext
- def test_iothreads(self):
+ def run_test_iothreads(self, iothread_a, iothread_b, errmsg = None):
opts = hd_opts(0)
result = self.vm.qmp('blockdev-add', conv_keys = False, **opts)
self.assert_qmp(result, 'return', {})
@@ -986,20 +985,48 @@ class TestBlockdevReopen(iotests.QMPTestCase):
result = self.vm.qmp('object-add', qom_type='iothread', id='iothread1')
self.assert_qmp(result, 'return', {})
- result = self.vm.qmp('x-blockdev-set-iothread', node_name='hd0', iothread='iothread0')
+ result = self.vm.qmp('device_add', driver='virtio-scsi', id='scsi0',
+ iothread=iothread_a)
self.assert_qmp(result, 'return', {})
- self.reopen(opts, {'backing': 'hd2'}, "Cannot use a new backing file with a different AioContext")
-
- result = self.vm.qmp('x-blockdev-set-iothread', node_name='hd2', iothread='iothread1')
+ result = self.vm.qmp('device_add', driver='virtio-scsi', id='scsi1',
+ iothread=iothread_b)
self.assert_qmp(result, 'return', {})
- self.reopen(opts, {'backing': 'hd2'}, "Cannot use a new backing file with a different AioContext")
+ if iothread_a:
+ result = self.vm.qmp('device_add', driver='scsi-hd', drive='hd0',
+ share_rw=True, bus="scsi0.0")
+ self.assert_qmp(result, 'return', {})
- result = self.vm.qmp('x-blockdev-set-iothread', node_name='hd2', iothread='iothread0')
- self.assert_qmp(result, 'return', {})
+ if iothread_b:
+ result = self.vm.qmp('device_add', driver='scsi-hd', drive='hd2',
+ share_rw=True, bus="scsi1.0")
+ self.assert_qmp(result, 'return', {})
- self.reopen(opts, {'backing': 'hd2'})
+ # Attaching the backing file may or may not work
+ self.reopen(opts, {'backing': 'hd2'}, errmsg)
+
+ # But removing the backing file should always work
+ self.reopen(opts, {'backing': None})
+
+ self.vm.shutdown()
+
+ # We don't allow setting a backing file that uses a different AioContext if
+ # neither of them can switch to the other AioContext
+ def test_iothreads_error(self):
+ self.run_test_iothreads('iothread0', 'iothread1',
+ "Cannot use a new backing file with a different AioContext")
+
+ def test_iothreads_compatible_users(self):
+ self.run_test_iothreads('iothread0', 'iothread0')
+
+ def test_iothreads_switch_backing(self):
+ self.run_test_iothreads('iothread0', None,
+ "Cannot use a new backing file with a different AioContext")
+
+ def test_iothreads_switch_overlay(self):
+ self.run_test_iothreads(None, 'iothread0',
+ "Cannot use a new backing file with a different AioContext")
if __name__ == '__main__':
iotests.main(supported_fmts=["qcow2"],
diff --git a/tests/qemu-iotests/245.out b/tests/qemu-iotests/245.out
index a19de5214d..682b93394d 100644
--- a/tests/qemu-iotests/245.out
+++ b/tests/qemu-iotests/245.out
@@ -1,6 +1,6 @@
-..................
+.....................
----------------------------------------------------------------------
-Ran 18 tests
+Ran 21 tests
OK
{"execute": "job-finalize", "arguments": {"id": "commit0"}}
--
2.20.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v2 2/2] block: bdrv_reopen() with backing file in different AioContext
2020-03-06 14:14 [PATCH v2 0/2] block: bdrv_reopen() with backing file in different AioContext Kevin Wolf
2020-03-06 14:14 ` [PATCH v2 1/2] iotests: Refactor blockdev-reopen test for iothreads Kevin Wolf
@ 2020-03-06 14:14 ` Kevin Wolf
2020-03-06 14:58 ` Alberto Garcia
1 sibling, 1 reply; 5+ messages in thread
From: Kevin Wolf @ 2020-03-06 14:14 UTC (permalink / raw)
To: qemu-block; +Cc: kwolf, pkrempa, berto, qemu-devel, mreitz
This patch allows bdrv_reopen() (and therefore the x-blockdev-reopen QMP
command) to attach a node as the new backing file even if the node is in
a different AioContext than the parent if one of both nodes can be moved
to the AioContext of the other node.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
---
block.c | 32 ++++++++++++++++++++++++++------
tests/qemu-iotests/245 | 8 +++-----
2 files changed, 29 insertions(+), 11 deletions(-)
diff --git a/block.c b/block.c
index aaa387504e..957630b1c5 100644
--- a/block.c
+++ b/block.c
@@ -3787,6 +3787,29 @@ static void bdrv_reopen_perm(BlockReopenQueue *q, BlockDriverState *bs,
*shared = cumulative_shared_perms;
}
+static bool bdrv_reopen_can_attach(BlockDriverState *parent,
+ BdrvChild *child,
+ BlockDriverState *new_child,
+ Error **errp)
+{
+ AioContext *parent_ctx = bdrv_get_aio_context(parent);
+ AioContext *child_ctx = bdrv_get_aio_context(new_child);
+ GSList *ignore;
+ bool ret;
+
+ ignore = g_slist_prepend(NULL, child);
+ ret = bdrv_can_set_aio_context(new_child, parent_ctx, &ignore, NULL);
+ g_slist_free(ignore);
+ if (ret) {
+ return ret;
+ }
+
+ ignore = g_slist_prepend(NULL, child);
+ ret = bdrv_can_set_aio_context(parent, child_ctx, &ignore, errp);
+ g_slist_free(ignore);
+ return ret;
+}
+
/*
* Take a BDRVReopenState and check if the value of 'backing' in the
* reopen_state->options QDict is valid or not.
@@ -3838,14 +3861,11 @@ static int bdrv_reopen_parse_backing(BDRVReopenState *reopen_state,
}
/*
- * TODO: before removing the x- prefix from x-blockdev-reopen we
- * should move the new backing file into the right AioContext
- * instead of returning an error.
+ * Check AioContext compatibility so that the bdrv_set_backing_hd() call in
+ * bdrv_reopen_commit() won't fail.
*/
if (new_backing_bs) {
- if (bdrv_get_aio_context(new_backing_bs) != bdrv_get_aio_context(bs)) {
- error_setg(errp, "Cannot use a new backing file "
- "with a different AioContext");
+ if (!bdrv_reopen_can_attach(bs, bs->backing, new_backing_bs, errp)) {
return -EINVAL;
}
}
diff --git a/tests/qemu-iotests/245 b/tests/qemu-iotests/245
index 7d9eb6285c..1001275a44 100755
--- a/tests/qemu-iotests/245
+++ b/tests/qemu-iotests/245
@@ -1015,18 +1015,16 @@ class TestBlockdevReopen(iotests.QMPTestCase):
# neither of them can switch to the other AioContext
def test_iothreads_error(self):
self.run_test_iothreads('iothread0', 'iothread1',
- "Cannot use a new backing file with a different AioContext")
+ "Cannot change iothread of active block backend")
def test_iothreads_compatible_users(self):
self.run_test_iothreads('iothread0', 'iothread0')
def test_iothreads_switch_backing(self):
- self.run_test_iothreads('iothread0', None,
- "Cannot use a new backing file with a different AioContext")
+ self.run_test_iothreads('iothread0', None)
def test_iothreads_switch_overlay(self):
- self.run_test_iothreads(None, 'iothread0',
- "Cannot use a new backing file with a different AioContext")
+ self.run_test_iothreads(None, 'iothread0')
if __name__ == '__main__':
iotests.main(supported_fmts=["qcow2"],
--
2.20.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 2/2] block: bdrv_reopen() with backing file in different AioContext
2020-03-06 14:14 ` [PATCH v2 2/2] block: bdrv_reopen() with backing file in different AioContext Kevin Wolf
@ 2020-03-06 14:58 ` Alberto Garcia
0 siblings, 0 replies; 5+ messages in thread
From: Alberto Garcia @ 2020-03-06 14:58 UTC (permalink / raw)
To: Kevin Wolf, qemu-block; +Cc: kwolf, pkrempa, qemu-devel, mreitz
On Fri 06 Mar 2020 03:14:13 PM CET, Kevin Wolf wrote:
> This patch allows bdrv_reopen() (and therefore the x-blockdev-reopen QMP
> command) to attach a node as the new backing file even if the node is in
> a different AioContext than the parent if one of both nodes can be moved
> to the AioContext of the other node.
>
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> Tested-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Berto
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/2] iotests: Refactor blockdev-reopen test for iothreads
2020-03-06 14:14 ` [PATCH v2 1/2] iotests: Refactor blockdev-reopen test for iothreads Kevin Wolf
@ 2020-03-12 22:47 ` John Snow
0 siblings, 0 replies; 5+ messages in thread
From: John Snow @ 2020-03-12 22:47 UTC (permalink / raw)
To: Kevin Wolf, qemu-block; +Cc: pkrempa, qemu-devel, mreitz
On 3/6/20 9:14 AM, Kevin Wolf wrote:
> We'll want to test more than one successful case in the future, so
> prepare the test for that by a refactoring that runs each scenario in a
> separate VM.
>
> test_iothreads_switch_{backing,overlay} currently produce errors, but
> these are cases that should actually work, by switching either the
> backing file node or the overlay node to the AioContext of the other
> node.
>
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> Tested-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
> ---
> tests/qemu-iotests/245 | 47 ++++++++++++++++++++++++++++++--------
> tests/qemu-iotests/245.out | 4 ++--
> 2 files changed, 39 insertions(+), 12 deletions(-)
>
> diff --git a/tests/qemu-iotests/245 b/tests/qemu-iotests/245
> index 489bf78bd0..7d9eb6285c 100755
> --- a/tests/qemu-iotests/245
> +++ b/tests/qemu-iotests/245
> @@ -970,8 +970,7 @@ class TestBlockdevReopen(iotests.QMPTestCase):
> self.assertEqual(self.get_node('hd1'), None)
> self.assert_qmp(self.get_node('hd2'), 'ro', True)
>
> - # We don't allow setting a backing file that uses a different AioContext
> - def test_iothreads(self):
> + def run_test_iothreads(self, iothread_a, iothread_b, errmsg = None):
> opts = hd_opts(0)
> result = self.vm.qmp('blockdev-add', conv_keys = False, **opts)
> self.assert_qmp(result, 'return', {})
> @@ -986,20 +985,48 @@ class TestBlockdevReopen(iotests.QMPTestCase):
> result = self.vm.qmp('object-add', qom_type='iothread', id='iothread1')
> self.assert_qmp(result, 'return', {})
>
> - result = self.vm.qmp('x-blockdev-set-iothread', node_name='hd0', iothread='iothread0')
> + result = self.vm.qmp('device_add', driver='virtio-scsi', id='scsi0',
> + iothread=iothread_a)
> self.assert_qmp(result, 'return', {})
>
> - self.reopen(opts, {'backing': 'hd2'}, "Cannot use a new backing file with a different AioContext")
> -
> - result = self.vm.qmp('x-blockdev-set-iothread', node_name='hd2', iothread='iothread1')
> + result = self.vm.qmp('device_add', driver='virtio-scsi', id='scsi1',
> + iothread=iothread_b)
> self.assert_qmp(result, 'return', {})
>
> - self.reopen(opts, {'backing': 'hd2'}, "Cannot use a new backing file with a different AioContext")
> + if iothread_a:
> + result = self.vm.qmp('device_add', driver='scsi-hd', drive='hd0',
> + share_rw=True, bus="scsi0.0")
> + self.assert_qmp(result, 'return', {})
>
> - result = self.vm.qmp('x-blockdev-set-iothread', node_name='hd2', iothread='iothread0')
> - self.assert_qmp(result, 'return', {})
> + if iothread_b:
> + result = self.vm.qmp('device_add', driver='scsi-hd', drive='hd2',
> + share_rw=True, bus="scsi1.0")
> + self.assert_qmp(result, 'return', {})
>
> - self.reopen(opts, {'backing': 'hd2'})
> + # Attaching the backing file may or may not work
> + self.reopen(opts, {'backing': 'hd2'}, errmsg)
> +
> + # But removing the backing file should always work
> + self.reopen(opts, {'backing': None})
> +
> + self.vm.shutdown()
> +
> + # We don't allow setting a backing file that uses a different AioContext if
> + # neither of them can switch to the other AioContext
> + def test_iothreads_error(self):
> + self.run_test_iothreads('iothread0', 'iothread1',
> + "Cannot use a new backing file with a different AioContext")
> +
> + def test_iothreads_compatible_users(self):
> + self.run_test_iothreads('iothread0', 'iothread0')
> +
> + def test_iothreads_switch_backing(self):
> + self.run_test_iothreads('iothread0', None,
> + "Cannot use a new backing file with a different AioContext")
> +
> + def test_iothreads_switch_overlay(self):
> + self.run_test_iothreads(None, 'iothread0',
> + "Cannot use a new backing file with a different AioContext")
>
> if __name__ == '__main__':
> iotests.main(supported_fmts=["qcow2"],
> diff --git a/tests/qemu-iotests/245.out b/tests/qemu-iotests/245.out
> index a19de5214d..682b93394d 100644
> --- a/tests/qemu-iotests/245.out
> +++ b/tests/qemu-iotests/245.out
> @@ -1,6 +1,6 @@
> -..................
> +.....................
> ----------------------------------------------------------------------
> -Ran 18 tests
> +Ran 21 tests
>
> OK
> {"execute": "job-finalize", "arguments": {"id": "commit0"}}
>
--
—js
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-03-12 22:48 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-06 14:14 [PATCH v2 0/2] block: bdrv_reopen() with backing file in different AioContext Kevin Wolf
2020-03-06 14:14 ` [PATCH v2 1/2] iotests: Refactor blockdev-reopen test for iothreads Kevin Wolf
2020-03-12 22:47 ` John Snow
2020-03-06 14:14 ` [PATCH v2 2/2] block: bdrv_reopen() with backing file in different AioContext Kevin Wolf
2020-03-06 14:58 ` Alberto Garcia
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.