From 915f7feb718ab551f6a0c0e05939e369c3aab759 Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Wed, 20 Aug 2014 16:40:12 +0200
Subject: [PATCH 5/7] block: make 'top' argument to block-commit optional
Message-id: <1408552814-23031-6-git-send-email-eblake@redhat.com>
Patchwork-id: 60647
O-Subject: [qemu-kvm-rhev 7.0.z PATCH 5/7] block: make 'top' argument to block-commit optional
Bugzilla: 1132806
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Fam Zheng <famz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
From: Jeff Cody <jcody@redhat.com>
Now that active layer block-commit is supported, the 'top' argument
no longer needs to be mandatory.
Change it to optional, with the default being the active layer in the
device chain.
[kwolf: Rebased and resolved conflict in tests/qemu-iotests/040]
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 7676e2c597000eff3a7233b40cca768b358f9bc9)
Conflicts:
qapi/block-core.json - downstream in qapi-schema.json still
tests/qemu-iotests/040 - context due to no common event handling
Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
blockdev.c | 16 ++++++++++++++--
qapi-schema.json | 7 ++++---
qmp-commands.hx | 5 +++--
tests/qemu-iotests/040 | 28 ++++++++++++++++++----------
4 files changed, 39 insertions(+), 17 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index e51203c..a94c9d3 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1463,7 +1463,8 @@ void qmp_block_stream(const char *device, bool has_base,
}
void qmp_block_commit(const char *device,
- bool has_base, const char *base, const char *top,
+ bool has_base, const char *base,
+ bool has_top, const char *top,
bool has_speed, int64_t speed,
Error **errp)
{
@@ -1478,6 +1479,11 @@ void qmp_block_commit(const char *device,
/* drain all i/o before commits */
bdrv_drain_all();
+ /* Important Note:
+ * libvirt relies on the DeviceNotFound error class in order to probe for
+ * live commit feature versions; for this to work, we must make sure to
+ * perform the device lookup before any generic errors that may occur in a
+ * scenario in which all optional arguments are omitted. */
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
@@ -1487,7 +1493,7 @@ void qmp_block_commit(const char *device,
/* default top_bs is the active layer */
top_bs = bs;
- if (top) {
+ if (has_top && top) {
if (strcmp(bs->filename, top) != 0) {
top_bs = bdrv_find_backing_image(bs, top);
}
@@ -1509,6 +1515,12 @@ void qmp_block_commit(const char *device,
return;
}
+ /* Do not allow attempts to commit an image into itself */
+ if (top_bs == base_bs) {
+ error_setg(errp, "cannot commit an image into itself");
+ return;
+ }
+
if (top_bs == bs) {
commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
bs, &local_err);
diff --git a/qapi-schema.json b/qapi-schema.json
index aaa86f5..3768872 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1838,8 +1838,9 @@
# @base: #optional The file name of the backing image to write data into.
# If not specified, this is the deepest backing image
#
-# @top: The file name of the backing image within the image chain,
-# which contains the topmost data to be committed down.
+# @top: #optional The file name of the backing image within the image chain,
+# which contains the topmost data to be committed down. If
+# not specified, this is the active layer.
#
# If top == base, that is an error.
# If top == active, the job will not be completed by itself,
@@ -1867,7 +1868,7 @@
#
##
{ 'command': 'block-commit',
- 'data': { 'device': 'str', '*base': 'str', 'top': 'str',
+ 'data': { 'device': 'str', '*base': 'str', '*top': 'str',
'*speed': 'int' } }
##
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 1d4be84..b6b6246 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1005,7 +1005,7 @@ EQMP
{
.name = "block-commit",
- .args_type = "device:B,base:s?,top:s,speed:o?",
+ .args_type = "device:B,base:s?,top:s?,speed:o?",
.mhandler.cmd_new = qmp_marshal_input_block_commit,
},
@@ -1023,7 +1023,8 @@ Arguments:
If not specified, this is the deepest backing image
(json-string, optional)
- "top": The file name of the backing image within the image chain,
- which contains the topmost data to be committed down.
+ which contains the topmost data to be committed down. If
+ not specified, this is the active layer. (json-string, optional)
If top == base, that is an error.
If top == active, the job will not be completed by itself,
diff --git a/tests/qemu-iotests/040 b/tests/qemu-iotests/040
index cf80e0c..c5ab930 100755
--- a/tests/qemu-iotests/040
+++ b/tests/qemu-iotests/040
@@ -63,11 +63,7 @@ class ImageCommitTestCase(iotests.QMPTestCase):
i = i + 512
file.close()
- def run_commit_test(self, top, base, need_ready=False):
- self.assert_no_active_commit()
- result = self.vm.qmp('block-commit', device='drive0', top=top, base=base)
- self.assert_qmp(result, 'return', {})
-
+ def wait_for_complete(self, need_ready=False):
completed = False
ready = False
while not completed:
@@ -90,6 +86,18 @@ class ImageCommitTestCase(iotests.QMPTestCase):
self.assert_no_active_commit()
self.vm.shutdown()
+ def run_commit_test(self, top, base, need_ready=False):
+ self.assert_no_active_commit()
+ result = self.vm.qmp('block-commit', device='drive0', top=top, base=base)
+ self.assert_qmp(result, 'return', {})
+ self.wait_for_complete(need_ready)
+
+ def run_default_commit_test(self):
+ self.assert_no_active_commit()
+ result = self.vm.qmp('block-commit', device='drive0')
+ self.assert_qmp(result, 'return', {})
+ self.wait_for_complete()
+
class TestSingleDrive(ImageCommitTestCase):
image_len = 1 * 1024 * 1024
test_len = 1 * 1024 * 256
@@ -141,17 +149,17 @@ class TestSingleDrive(ImageCommitTestCase):
self.assertEqual(-1, qemu_io('-c', 'read -P 0xab 0 524288', backing_img).find("verification failed"))
self.assertEqual(-1, qemu_io('-c', 'read -P 0xef 524288 524288', backing_img).find("verification failed"))
+ def test_top_is_default_active(self):
+ self.run_default_commit_test()
+ self.assertEqual(-1, qemu_io('-c', 'read -P 0xab 0 524288', backing_img).find("verification failed"))
+ self.assertEqual(-1, qemu_io('-c', 'read -P 0xef 524288 524288', backing_img).find("verification failed"))
+
def test_top_and_base_reversed(self):
self.assert_no_active_commit()
result = self.vm.qmp('block-commit', device='drive0', top='%s' % backing_img, base='%s' % mid_img)
self.assert_qmp(result, 'error/class', 'GenericError')
self.assert_qmp(result, 'error/desc', 'Base \'%s\' not found' % mid_img)
- def test_top_omitted(self):
- self.assert_no_active_commit()
- result = self.vm.qmp('block-commit', device='drive0')
- self.assert_qmp(result, 'error/class', 'GenericError')
- self.assert_qmp(result, 'error/desc', "Parameter 'top' is missing")
class TestRelativePaths(ImageCommitTestCase):
image_len = 1 * 1024 * 1024
--
1.7.1