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* [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature
@ 2019-06-06 15:37 Markus Armbruster
  2019-06-06 15:37 ` [Qemu-devel] [PATCH 1/7] qapi: Add feature flags to struct types Markus Armbruster
                   ` (8 more replies)
  0 siblings, 9 replies; 12+ messages in thread
From: Markus Armbruster @ 2019-06-06 15:37 UTC (permalink / raw)
  To: qemu-devel; +Cc: kwolf, pkrempa, qemu-block

This series adds optional feature lists to struct definitions in the
QAPI schema and makes use of them to advertise the new behaviour of
auto-read-only=on in file-posix.

v5:
- PATCH 4: restore a lost comment line, clean up comment whitespace
  for PEP 8
- PATCH 4+5: replace QAPIDoc._check_named_section() by
  ._is_section_tag()
- PATCH 7: New

v4:
- Build fix for tests/test-qmp-cmds

v3:
- Added a command using the structs types to the positive test case
- Renamed QAPIDoc.SymbolPart to QAPIDoc.DocPart
- Applied requested comment changes
- Style fixes to avoid adding pycodestyle-3 complaints
- More stylistic changes to match Markus' taste better

v2:
- Check that features have well-formed names instead of just checking
  that they are strings
- Use QAPISchemaFeature objects instead of dicts
- Catch duplicate feature names (and test that a feature name doesn't
  conflict with an object member)
- Added patch 4 and 5 to add rudimentary support for features to
  QAPIDoc so it doesn't complain about the documentation format
  suggested by Markus. Used that format in the documentation of
  dynamic-auto-read-only.

Kevin Wolf (6):
  qapi: Add feature flags to struct types
  tests/qapi-schema: Test for good feature lists in structs
  tests/qapi-schema: Error case tests for features in structs
  qapi: Disentangle QAPIDoc code
  qapi: Allow documentation for features
  file-posix: Add dynamic-auto-read-only QAPI feature

Markus Armbruster (1):
  qapi: Simplify QAPIDoc implements its state machine

 docs/devel/qapi-code-gen.txt                  |  38 +++
 qapi/block-core.json                          |  13 +-
 qapi/introspect.json                          |   6 +-
 scripts/qapi/common.py                        | 243 +++++++++++++++---
 scripts/qapi/doc.py                           |  15 +-
 scripts/qapi/introspect.py                    |   6 +-
 scripts/qapi/types.py                         |   3 +-
 scripts/qapi/visit.py                         |   3 +-
 tests/Makefile.include                        |   6 +
 tests/qapi-schema/double-type.err             |   2 +-
 tests/qapi-schema/features-bad-type.err       |   1 +
 tests/qapi-schema/features-bad-type.exit      |   1 +
 tests/qapi-schema/features-bad-type.json      |   3 +
 tests/qapi-schema/features-bad-type.out       |   0
 tests/qapi-schema/features-duplicate-name.err |   1 +
 .../qapi-schema/features-duplicate-name.exit  |   1 +
 .../qapi-schema/features-duplicate-name.json  |   3 +
 tests/qapi-schema/features-duplicate-name.out |   0
 tests/qapi-schema/features-missing-name.err   |   1 +
 tests/qapi-schema/features-missing-name.exit  |   1 +
 tests/qapi-schema/features-missing-name.json  |   3 +
 tests/qapi-schema/features-missing-name.out   |   0
 tests/qapi-schema/features-name-bad-type.err  |   1 +
 tests/qapi-schema/features-name-bad-type.exit |   1 +
 tests/qapi-schema/features-name-bad-type.json |   3 +
 tests/qapi-schema/features-name-bad-type.out  |   0
 tests/qapi-schema/features-no-list.err        |   1 +
 tests/qapi-schema/features-no-list.exit       |   1 +
 tests/qapi-schema/features-no-list.json       |   3 +
 tests/qapi-schema/features-no-list.out        |   0
 tests/qapi-schema/features-unknown-key.err    |   2 +
 tests/qapi-schema/features-unknown-key.exit   |   1 +
 tests/qapi-schema/features-unknown-key.json   |   3 +
 tests/qapi-schema/features-unknown-key.out    |   0
 tests/qapi-schema/qapi-schema-test.json       |  39 +++
 tests/qapi-schema/qapi-schema-test.out        |  43 ++++
 tests/qapi-schema/test-qapi.py                |   7 +-
 tests/qapi-schema/unknown-expr-key.err        |   2 +-
 tests/test-qmp-cmds.c                         |   8 +
 39 files changed, 419 insertions(+), 46 deletions(-)
 create mode 100644 tests/qapi-schema/features-bad-type.err
 create mode 100644 tests/qapi-schema/features-bad-type.exit
 create mode 100644 tests/qapi-schema/features-bad-type.json
 create mode 100644 tests/qapi-schema/features-bad-type.out
 create mode 100644 tests/qapi-schema/features-duplicate-name.err
 create mode 100644 tests/qapi-schema/features-duplicate-name.exit
 create mode 100644 tests/qapi-schema/features-duplicate-name.json
 create mode 100644 tests/qapi-schema/features-duplicate-name.out
 create mode 100644 tests/qapi-schema/features-missing-name.err
 create mode 100644 tests/qapi-schema/features-missing-name.exit
 create mode 100644 tests/qapi-schema/features-missing-name.json
 create mode 100644 tests/qapi-schema/features-missing-name.out
 create mode 100644 tests/qapi-schema/features-name-bad-type.err
 create mode 100644 tests/qapi-schema/features-name-bad-type.exit
 create mode 100644 tests/qapi-schema/features-name-bad-type.json
 create mode 100644 tests/qapi-schema/features-name-bad-type.out
 create mode 100644 tests/qapi-schema/features-no-list.err
 create mode 100644 tests/qapi-schema/features-no-list.exit
 create mode 100644 tests/qapi-schema/features-no-list.json
 create mode 100644 tests/qapi-schema/features-no-list.out
 create mode 100644 tests/qapi-schema/features-unknown-key.err
 create mode 100644 tests/qapi-schema/features-unknown-key.exit
 create mode 100644 tests/qapi-schema/features-unknown-key.json
 create mode 100644 tests/qapi-schema/features-unknown-key.out

-- 
2.21.0



^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Qemu-devel] [PATCH 1/7] qapi: Add feature flags to struct types
  2019-06-06 15:37 [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
@ 2019-06-06 15:37 ` Markus Armbruster
  2019-06-06 15:37 ` [Qemu-devel] [PATCH 2/7] tests/qapi-schema: Test for good feature lists in structs Markus Armbruster
                   ` (7 subsequent siblings)
  8 siblings, 0 replies; 12+ messages in thread
From: Markus Armbruster @ 2019-06-06 15:37 UTC (permalink / raw)
  To: qemu-devel; +Cc: kwolf, pkrempa, qemu-block

From: Kevin Wolf <kwolf@redhat.com>

Sometimes, the behaviour of QEMU changes without a change in the QMP
syntax (usually by allowing values or operations that previously
resulted in an error). QMP clients may still need to know whether
they can rely on the changed behavior.

Let's add feature flags to the QAPI schema language, so that we can make
such changes visible with schema introspection.

An example for a schema definition using feature flags looks like this:

    { 'struct': 'TestType',
      'data': { 'number': 'int' },
      'features': [ 'allow-negative-numbers' ] }

Introspection information then looks like this:

    { "name": "TestType", "meta-type": "object",
      "members": [
          { "name": "number", "type": "int" } ],
      "features": [ "allow-negative-numbers" ] }

This patch implements feature flags only for struct types. We'll
implement them more widely as needed.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 docs/devel/qapi-code-gen.txt           | 38 +++++++++++++++
 qapi/introspect.json                   |  6 ++-
 scripts/qapi/common.py                 | 66 ++++++++++++++++++++++----
 scripts/qapi/doc.py                    |  3 +-
 scripts/qapi/introspect.py             |  6 ++-
 scripts/qapi/types.py                  |  3 +-
 scripts/qapi/visit.py                  |  3 +-
 tests/qapi-schema/double-type.err      |  2 +-
 tests/qapi-schema/test-qapi.py         |  3 +-
 tests/qapi-schema/unknown-expr-key.err |  2 +-
 10 files changed, 114 insertions(+), 18 deletions(-)

diff --git a/docs/devel/qapi-code-gen.txt b/docs/devel/qapi-code-gen.txt
index b517b0cfbf..e8ec8ac1de 100644
--- a/docs/devel/qapi-code-gen.txt
+++ b/docs/devel/qapi-code-gen.txt
@@ -719,6 +719,34 @@ any non-empty complex type (struct, union, or alternate), and a
 pointer to that QAPI type is passed as a single argument.
 
 
+=== Features ===
+
+Sometimes, the behaviour of QEMU changes compatibly, but without a
+change in the QMP syntax (usually by allowing values or operations that
+previously resulted in an error). QMP clients may still need to know
+whether the extension is available.
+
+For this purpose, a list of features can be specified for a struct type.
+This is exposed to the client as a list of string, where each string
+signals that this build of QEMU shows a certain behaviour.
+
+In the schema, features can be specified as simple strings, for example:
+
+{ 'struct': 'TestType',
+  'data': { 'number': 'int' },
+  'features': [ 'allow-negative-numbers' ] }
+
+Another option is to specify features as dictionaries, where the key
+'name' specifies the feature string to be exposed to clients:
+
+{ 'struct': 'TestType',
+  'data': { 'number': 'int' },
+  'features': [ { 'name': 'allow-negative-numbers' } ] }
+
+This expanded form is necessary if you want to make the feature
+conditional (see below in "Configuring the schema").
+
+
 === Downstream extensions ===
 
 QAPI schema names that are externally visible, say in the Client JSON
@@ -771,6 +799,16 @@ Example: a conditional 'bar' enum member.
   [ 'foo',
     { 'name' : 'bar', 'if': 'defined(IFCOND)' } ] }
 
+Similarly, features can be specified as a dictionary with a 'name' and
+an 'if' key.
+
+Example: a conditional 'allow-negative-numbers' feature
+
+{ 'struct': 'TestType',
+  'data': { 'number': 'int' },
+  'features': [ { 'name': 'allow-negative-numbers',
+                  'if' 'defined(IFCOND)' } ] }
+
 Please note that you are responsible to ensure that the C code will
 compile with an arbitrary combination of conditions, since the
 generators are unable to check it at this point.
diff --git a/qapi/introspect.json b/qapi/introspect.json
index 3d22166b2b..1843c1cb17 100644
--- a/qapi/introspect.json
+++ b/qapi/introspect.json
@@ -174,6 +174,9 @@
 #            and may even differ from the order of the values of the
 #            enum type of the @tag.
 #
+# @features: names of features associated with the type, in no particular
+#            order. (since: 4.1)
+#
 # Values of this type are JSON object on the wire.
 #
 # Since: 2.5
@@ -181,7 +184,8 @@
 { 'struct': 'SchemaInfoObject',
   'data': { 'members': [ 'SchemaInfoObjectMember' ],
             '*tag': 'str',
-            '*variants': [ 'SchemaInfoObjectVariant' ] } }
+            '*variants': [ 'SchemaInfoObjectVariant' ],
+            '*features': [ 'str' ] } }
 
 ##
 # @SchemaInfoObjectMember:
diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index f07869ec73..9e4b6c00b5 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -886,12 +886,26 @@ def check_enum(expr, info):
 def check_struct(expr, info):
     name = expr['struct']
     members = expr['data']
+    features = expr.get('features')
 
     check_type(info, "'data' for struct '%s'" % name, members,
                allow_dict=True, allow_optional=True)
     check_type(info, "'base' for struct '%s'" % name, expr.get('base'),
                allow_metas=['struct'])
 
+    if features:
+        if not isinstance(features, list):
+            raise QAPISemError(info,
+                               "Struct '%s' requires an array for 'features'" %
+                               name)
+        for f in features:
+            assert isinstance(f, dict)
+            check_known_keys(info, "feature of struct %s" % name, f,
+                             ['name'], ['if'])
+
+            check_if(f, info)
+            check_name(info, "Feature of struct %s" % name, f['name'])
+
 
 def check_known_keys(info, source, keys, required, optional):
 
@@ -948,6 +962,12 @@ def normalize_members(members):
             members[key] = {'type': arg}
 
 
+def normalize_features(features):
+    if isinstance(features, list):
+        features[:] = [f if isinstance(f, dict) else {'name': f}
+                       for f in features]
+
+
 def check_exprs(exprs):
     global all_names
 
@@ -986,8 +1006,10 @@ def check_exprs(exprs):
             normalize_members(expr['data'])
         elif 'struct' in expr:
             meta = 'struct'
-            check_keys(expr_elem, 'struct', ['data'], ['base', 'if'])
+            check_keys(expr_elem, 'struct', ['data'],
+                       ['base', 'if', 'features'])
             normalize_members(expr['data'])
+            normalize_features(expr.get('features'))
             struct_types[expr[meta]] = expr
         elif 'command' in expr:
             meta = 'command'
@@ -1126,10 +1148,12 @@ class QAPISchemaVisitor(object):
     def visit_array_type(self, name, info, ifcond, element_type):
         pass
 
-    def visit_object_type(self, name, info, ifcond, base, members, variants):
+    def visit_object_type(self, name, info, ifcond, base, members, variants,
+                          features):
         pass
 
-    def visit_object_type_flat(self, name, info, ifcond, members, variants):
+    def visit_object_type_flat(self, name, info, ifcond, members, variants,
+                               features):
         pass
 
     def visit_alternate_type(self, name, info, ifcond, variants):
@@ -1290,7 +1314,7 @@ class QAPISchemaArrayType(QAPISchemaType):
 
 class QAPISchemaObjectType(QAPISchemaType):
     def __init__(self, name, info, doc, ifcond,
-                 base, local_members, variants):
+                 base, local_members, variants, features):
         # struct has local_members, optional base, and no variants
         # flat union has base, variants, and no local_members
         # simple union has local_members, variants, and no base
@@ -1302,11 +1326,15 @@ class QAPISchemaObjectType(QAPISchemaType):
         if variants is not None:
             assert isinstance(variants, QAPISchemaObjectTypeVariants)
             variants.set_owner(name)
+        for f in features:
+            assert isinstance(f, QAPISchemaFeature)
+            f.set_owner(name)
         self._base_name = base
         self.base = None
         self.local_members = local_members
         self.variants = variants
         self.members = None
+        self.features = features
 
     def check(self, schema):
         QAPISchemaType.check(self, schema)
@@ -1332,6 +1360,12 @@ class QAPISchemaObjectType(QAPISchemaType):
             self.variants.check(schema, seen)
             assert self.variants.tag_member in self.members
             self.variants.check_clash(self.info, seen)
+
+        # Features are in a name space separate from members
+        seen = {}
+        for f in self.features:
+            f.check_clash(self.info, seen)
+
         if self.doc:
             self.doc.check()
 
@@ -1368,12 +1402,15 @@ class QAPISchemaObjectType(QAPISchemaType):
 
     def visit(self, visitor):
         visitor.visit_object_type(self.name, self.info, self.ifcond,
-                                  self.base, self.local_members, self.variants)
+                                  self.base, self.local_members, self.variants,
+                                  self.features)
         visitor.visit_object_type_flat(self.name, self.info, self.ifcond,
-                                       self.members, self.variants)
+                                       self.members, self.variants,
+                                       self.features)
 
 
 class QAPISchemaMember(object):
+    """ Represents object members, enum members and features """
     role = 'member'
 
     def __init__(self, name, ifcond=None):
@@ -1419,6 +1456,10 @@ class QAPISchemaMember(object):
         return "'%s' %s" % (self.name, self._pretty_owner())
 
 
+class QAPISchemaFeature(QAPISchemaMember):
+    role = 'feature'
+
+
 class QAPISchemaObjectTypeMember(QAPISchemaMember):
     def __init__(self, name, typ, optional, ifcond=None):
         QAPISchemaMember.__init__(self, name, ifcond)
@@ -1675,7 +1716,7 @@ class QAPISchema(object):
                   ('null',   'null',    'QNull' + pointer_suffix)]:
             self._def_builtin_type(*t)
         self.the_empty_object_type = QAPISchemaObjectType(
-            'q_empty', None, None, None, None, [], None)
+            'q_empty', None, None, None, None, [], None, [])
         self._def_entity(self.the_empty_object_type)
 
         qtypes = ['none', 'qnull', 'qnum', 'qstring', 'qdict', 'qlist',
@@ -1685,6 +1726,9 @@ class QAPISchema(object):
         self._def_entity(QAPISchemaEnumType('QType', None, None, None,
                                             qtype_values, 'QTYPE'))
 
+    def _make_features(self, features):
+        return [QAPISchemaFeature(f['name'], f.get('if')) for f in features]
+
     def _make_enum_members(self, values):
         return [QAPISchemaMember(v['name'], v.get('if')) for v in values]
 
@@ -1721,7 +1765,7 @@ class QAPISchema(object):
             assert ifcond == typ._ifcond # pylint: disable=protected-access
         else:
             self._def_entity(QAPISchemaObjectType(name, info, doc, ifcond,
-                                                  None, members, None))
+                                                  None, members, None, []))
         return name
 
     def _def_enum_type(self, expr, info, doc):
@@ -1752,9 +1796,11 @@ class QAPISchema(object):
         base = expr.get('base')
         data = expr['data']
         ifcond = expr.get('if')
+        features = expr.get('features', [])
         self._def_entity(QAPISchemaObjectType(name, info, doc, ifcond, base,
                                               self._make_members(data, info),
-                                              None))
+                                              None,
+                                              self._make_features(features)))
 
     def _make_variant(self, case, typ, ifcond):
         return QAPISchemaObjectTypeVariant(case, typ, ifcond)
@@ -1795,7 +1841,7 @@ class QAPISchema(object):
             QAPISchemaObjectType(name, info, doc, ifcond, base, members,
                                  QAPISchemaObjectTypeVariants(tag_name,
                                                               tag_member,
-                                                              variants)))
+                                                              variants), []))
 
     def _def_alternate_type(self, expr, info, doc):
         name = expr['alternate']
diff --git a/scripts/qapi/doc.py b/scripts/qapi/doc.py
index 5c8c136899..433e9fcbfb 100755
--- a/scripts/qapi/doc.py
+++ b/scripts/qapi/doc.py
@@ -220,7 +220,8 @@ class QAPISchemaGenDocVisitor(qapi.common.QAPISchemaVisitor):
                                body=texi_entity(doc, 'Values', ifcond,
                                                 member_func=texi_enum_value)))
 
-    def visit_object_type(self, name, info, ifcond, base, members, variants):
+    def visit_object_type(self, name, info, ifcond, base, members, variants,
+                          features):
         doc = self.cur_doc
         if base and base.is_implicit():
             base = None
diff --git a/scripts/qapi/introspect.py b/scripts/qapi/introspect.py
index f7f2ca07e4..f62cf0a2e1 100644
--- a/scripts/qapi/introspect.py
+++ b/scripts/qapi/introspect.py
@@ -188,11 +188,15 @@ const QLitObject %(c_name)s = %(c_string)s;
         self._gen_qlit('[' + element + ']', 'array', {'element-type': element},
                        ifcond)
 
-    def visit_object_type_flat(self, name, info, ifcond, members, variants):
+    def visit_object_type_flat(self, name, info, ifcond, members, variants,
+                               features):
         obj = {'members': [self._gen_member(m) for m in members]}
         if variants:
             obj.update(self._gen_variants(variants.tag_member.name,
                                           variants.variants))
+        if features:
+            obj['features'] = [(f.name, {'if': f.ifcond}) for f in features]
+
         self._gen_qlit(name, 'object', obj, ifcond)
 
     def visit_alternate_type(self, name, info, ifcond, variants):
diff --git a/scripts/qapi/types.py b/scripts/qapi/types.py
index 2bd6fcd44f..3edd9374aa 100644
--- a/scripts/qapi/types.py
+++ b/scripts/qapi/types.py
@@ -227,7 +227,8 @@ class QAPISchemaGenTypeVisitor(QAPISchemaModularCVisitor):
             self._genh.add(gen_array(name, element_type))
             self._gen_type_cleanup(name)
 
-    def visit_object_type(self, name, info, ifcond, base, members, variants):
+    def visit_object_type(self, name, info, ifcond, base, members, variants,
+                          features):
         # Nothing to do for the special empty builtin
         if name == 'q_empty':
             return
diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py
index 826b8066e1..c1cd675c95 100644
--- a/scripts/qapi/visit.py
+++ b/scripts/qapi/visit.py
@@ -326,7 +326,8 @@ class QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor):
             self._genh.add(gen_visit_decl(name))
             self._genc.add(gen_visit_list(name, element_type))
 
-    def visit_object_type(self, name, info, ifcond, base, members, variants):
+    def visit_object_type(self, name, info, ifcond, base, members, variants,
+                          features):
         # Nothing to do for the special empty builtin
         if name == 'q_empty':
             return
diff --git a/tests/qapi-schema/double-type.err b/tests/qapi-schema/double-type.err
index 799193dba1..69457173a7 100644
--- a/tests/qapi-schema/double-type.err
+++ b/tests/qapi-schema/double-type.err
@@ -1,2 +1,2 @@
 tests/qapi-schema/double-type.json:2: Unknown key 'command' in struct 'bar'
-Valid keys are 'base', 'data', 'if', 'struct'.
+Valid keys are 'base', 'data', 'features', 'if', 'struct'.
diff --git a/tests/qapi-schema/test-qapi.py b/tests/qapi-schema/test-qapi.py
index d21fca01fc..f2d6815c86 100644
--- a/tests/qapi-schema/test-qapi.py
+++ b/tests/qapi-schema/test-qapi.py
@@ -38,7 +38,8 @@ class QAPISchemaTestVisitor(QAPISchemaVisitor):
         print('array %s %s' % (name, element_type.name))
         self._print_if(ifcond)
 
-    def visit_object_type(self, name, info, ifcond, base, members, variants):
+    def visit_object_type(self, name, info, ifcond, base, members, variants,
+                          features):
         print('object %s' % name)
         if base:
             print('    base %s' % base.name)
diff --git a/tests/qapi-schema/unknown-expr-key.err b/tests/qapi-schema/unknown-expr-key.err
index 6ff8bb99c5..4340eaf894 100644
--- a/tests/qapi-schema/unknown-expr-key.err
+++ b/tests/qapi-schema/unknown-expr-key.err
@@ -1,2 +1,2 @@
 tests/qapi-schema/unknown-expr-key.json:2: Unknown keys 'bogus', 'phony' in struct 'bar'
-Valid keys are 'base', 'data', 'if', 'struct'.
+Valid keys are 'base', 'data', 'features', 'if', 'struct'.
-- 
2.21.0



^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [Qemu-devel] [PATCH 2/7] tests/qapi-schema: Test for good feature lists in structs
  2019-06-06 15:37 [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
  2019-06-06 15:37 ` [Qemu-devel] [PATCH 1/7] qapi: Add feature flags to struct types Markus Armbruster
@ 2019-06-06 15:37 ` Markus Armbruster
  2019-06-06 15:37 ` [Qemu-devel] [PATCH 3/7] tests/qapi-schema: Error case tests for features " Markus Armbruster
                   ` (6 subsequent siblings)
  8 siblings, 0 replies; 12+ messages in thread
From: Markus Armbruster @ 2019-06-06 15:37 UTC (permalink / raw)
  To: qemu-devel; +Cc: kwolf, pkrempa, qemu-block

From: Kevin Wolf <kwolf@redhat.com>

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 tests/qapi-schema/qapi-schema-test.json | 39 ++++++++++++++++++++++
 tests/qapi-schema/qapi-schema-test.out  | 43 +++++++++++++++++++++++++
 tests/qapi-schema/test-qapi.py          |  4 +++
 tests/test-qmp-cmds.c                   |  8 +++++
 4 files changed, 94 insertions(+)

diff --git a/tests/qapi-schema/qapi-schema-test.json b/tests/qapi-schema/qapi-schema-test.json
index 0952c68734..c6d59acc3e 100644
--- a/tests/qapi-schema/qapi-schema-test.json
+++ b/tests/qapi-schema/qapi-schema-test.json
@@ -242,3 +242,42 @@
   { 'foo': 'TestIfStruct',
     'bar': { 'type': ['TestIfEnum'], 'if': 'defined(TEST_IF_EVT_BAR)' } },
   'if': 'defined(TEST_IF_EVT) && defined(TEST_IF_STRUCT)' }
+
+# test 'features' for structs
+
+{ 'struct': 'FeatureStruct0',
+  'data': { 'foo': 'int' },
+  'features': [] }
+{ 'struct': 'FeatureStruct1',
+  'data': { 'foo': 'int' },
+  'features': [ 'feature1' ] }
+{ 'struct': 'FeatureStruct2',
+  'data': { 'foo': 'int' },
+  'features': [ { 'name': 'feature1' } ] }
+{ 'struct': 'FeatureStruct3',
+  'data': { 'foo': 'int' },
+  'features': [ 'feature1', 'feature2' ] }
+{ 'struct': 'FeatureStruct4',
+  'data': { 'namespace-test': 'int' },
+  'features': [ 'namespace-test', 'int', 'name', 'if' ] }
+
+{ 'struct': 'CondFeatureStruct1',
+  'data': { 'foo': 'int' },
+  'features': [ { 'name': 'feature1', 'if': 'defined(TEST_IF_FEATURE_1)'} ] }
+{ 'struct': 'CondFeatureStruct2',
+  'data': { 'foo': 'int' },
+  'features': [ { 'name': 'feature1', 'if': 'defined(TEST_IF_FEATURE_1)'},
+                { 'name': 'feature2', 'if': 'defined(TEST_IF_FEATURE_2)'} ] }
+{ 'struct': 'CondFeatureStruct3',
+  'data': { 'foo': 'int' },
+  'features': [ { 'name': 'feature1', 'if': [ 'defined(TEST_IF_COND_1)',
+                                              'defined(TEST_IF_COND_2)'] } ] }
+{ 'command': 'test-features',
+  'data': { 'fs0': 'FeatureStruct0',
+            'fs1': 'FeatureStruct1',
+            'fs2': 'FeatureStruct2',
+            'fs3': 'FeatureStruct3',
+            'fs4': 'FeatureStruct4',
+            'cfs1': 'CondFeatureStruct1',
+            'cfs2': 'CondFeatureStruct2',
+            'cfs3': 'CondFeatureStruct3' } }
diff --git a/tests/qapi-schema/qapi-schema-test.out b/tests/qapi-schema/qapi-schema-test.out
index 77fb1e1aa9..85d510bc00 100644
--- a/tests/qapi-schema/qapi-schema-test.out
+++ b/tests/qapi-schema/qapi-schema-test.out
@@ -354,3 +354,46 @@ object q_obj_TestIfEvent-arg
 event TestIfEvent q_obj_TestIfEvent-arg
    boxed=False
     if ['defined(TEST_IF_EVT) && defined(TEST_IF_STRUCT)']
+object FeatureStruct0
+    member foo: int optional=False
+object FeatureStruct1
+    member foo: int optional=False
+    feature feature1
+object FeatureStruct2
+    member foo: int optional=False
+    feature feature1
+object FeatureStruct3
+    member foo: int optional=False
+    feature feature1
+    feature feature2
+object FeatureStruct4
+    member namespace-test: int optional=False
+    feature namespace-test
+    feature int
+    feature name
+    feature if
+object CondFeatureStruct1
+    member foo: int optional=False
+    feature feature1
+        if ['defined(TEST_IF_FEATURE_1)']
+object CondFeatureStruct2
+    member foo: int optional=False
+    feature feature1
+        if ['defined(TEST_IF_FEATURE_1)']
+    feature feature2
+        if ['defined(TEST_IF_FEATURE_2)']
+object CondFeatureStruct3
+    member foo: int optional=False
+    feature feature1
+        if ['defined(TEST_IF_COND_1)', 'defined(TEST_IF_COND_2)']
+object q_obj_test-features-arg
+    member fs0: FeatureStruct0 optional=False
+    member fs1: FeatureStruct1 optional=False
+    member fs2: FeatureStruct2 optional=False
+    member fs3: FeatureStruct3 optional=False
+    member fs4: FeatureStruct4 optional=False
+    member cfs1: CondFeatureStruct1 optional=False
+    member cfs2: CondFeatureStruct2 optional=False
+    member cfs3: CondFeatureStruct3 optional=False
+command test-features q_obj_test-features-arg -> None
+   gen=True success_response=True boxed=False oob=False preconfig=False
diff --git a/tests/qapi-schema/test-qapi.py b/tests/qapi-schema/test-qapi.py
index f2d6815c86..b0f770b9bd 100644
--- a/tests/qapi-schema/test-qapi.py
+++ b/tests/qapi-schema/test-qapi.py
@@ -49,6 +49,10 @@ class QAPISchemaTestVisitor(QAPISchemaVisitor):
             self._print_if(m.ifcond, 8)
         self._print_variants(variants)
         self._print_if(ifcond)
+        if features:
+            for f in features:
+                print('    feature %s' % f.name)
+                self._print_if(f.ifcond, 8)
 
     def visit_alternate_type(self, name, info, ifcond, variants):
         print('alternate %s' % name)
diff --git a/tests/test-qmp-cmds.c b/tests/test-qmp-cmds.c
index 630b1b9bac..1f738f12e2 100644
--- a/tests/test-qmp-cmds.c
+++ b/tests/test-qmp-cmds.c
@@ -45,6 +45,14 @@ void qmp_user_def_cmd1(UserDefOne * ud1, Error **errp)
 {
 }
 
+void qmp_test_features(FeatureStruct0 *fs0, FeatureStruct1 *fs1,
+                       FeatureStruct2 *fs2, FeatureStruct3 *fs3,
+                       FeatureStruct4 *fs4, CondFeatureStruct1 *cfs1,
+                       CondFeatureStruct2 *cfs2, CondFeatureStruct3 *cfs3,
+                       Error **errp)
+{
+}
+
 UserDefTwo *qmp_user_def_cmd2(UserDefOne *ud1a,
                               bool has_udb1, UserDefOne *ud1b,
                               Error **errp)
-- 
2.21.0



^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [Qemu-devel] [PATCH 3/7] tests/qapi-schema: Error case tests for features in structs
  2019-06-06 15:37 [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
  2019-06-06 15:37 ` [Qemu-devel] [PATCH 1/7] qapi: Add feature flags to struct types Markus Armbruster
  2019-06-06 15:37 ` [Qemu-devel] [PATCH 2/7] tests/qapi-schema: Test for good feature lists in structs Markus Armbruster
@ 2019-06-06 15:37 ` Markus Armbruster
  2019-06-06 15:38 ` [Qemu-devel] [PATCH 4/7] qapi: Disentangle QAPIDoc code Markus Armbruster
                   ` (5 subsequent siblings)
  8 siblings, 0 replies; 12+ messages in thread
From: Markus Armbruster @ 2019-06-06 15:37 UTC (permalink / raw)
  To: qemu-devel; +Cc: kwolf, pkrempa, qemu-block

From: Kevin Wolf <kwolf@redhat.com>

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 tests/Makefile.include                         | 6 ++++++
 tests/qapi-schema/features-bad-type.err        | 1 +
 tests/qapi-schema/features-bad-type.exit       | 1 +
 tests/qapi-schema/features-bad-type.json       | 3 +++
 tests/qapi-schema/features-bad-type.out        | 0
 tests/qapi-schema/features-duplicate-name.err  | 1 +
 tests/qapi-schema/features-duplicate-name.exit | 1 +
 tests/qapi-schema/features-duplicate-name.json | 3 +++
 tests/qapi-schema/features-duplicate-name.out  | 0
 tests/qapi-schema/features-missing-name.err    | 1 +
 tests/qapi-schema/features-missing-name.exit   | 1 +
 tests/qapi-schema/features-missing-name.json   | 3 +++
 tests/qapi-schema/features-missing-name.out    | 0
 tests/qapi-schema/features-name-bad-type.err   | 1 +
 tests/qapi-schema/features-name-bad-type.exit  | 1 +
 tests/qapi-schema/features-name-bad-type.json  | 3 +++
 tests/qapi-schema/features-name-bad-type.out   | 0
 tests/qapi-schema/features-no-list.err         | 1 +
 tests/qapi-schema/features-no-list.exit        | 1 +
 tests/qapi-schema/features-no-list.json        | 3 +++
 tests/qapi-schema/features-no-list.out         | 0
 tests/qapi-schema/features-unknown-key.err     | 2 ++
 tests/qapi-schema/features-unknown-key.exit    | 1 +
 tests/qapi-schema/features-unknown-key.json    | 3 +++
 tests/qapi-schema/features-unknown-key.out     | 0
 25 files changed, 37 insertions(+)
 create mode 100644 tests/qapi-schema/features-bad-type.err
 create mode 100644 tests/qapi-schema/features-bad-type.exit
 create mode 100644 tests/qapi-schema/features-bad-type.json
 create mode 100644 tests/qapi-schema/features-bad-type.out
 create mode 100644 tests/qapi-schema/features-duplicate-name.err
 create mode 100644 tests/qapi-schema/features-duplicate-name.exit
 create mode 100644 tests/qapi-schema/features-duplicate-name.json
 create mode 100644 tests/qapi-schema/features-duplicate-name.out
 create mode 100644 tests/qapi-schema/features-missing-name.err
 create mode 100644 tests/qapi-schema/features-missing-name.exit
 create mode 100644 tests/qapi-schema/features-missing-name.json
 create mode 100644 tests/qapi-schema/features-missing-name.out
 create mode 100644 tests/qapi-schema/features-name-bad-type.err
 create mode 100644 tests/qapi-schema/features-name-bad-type.exit
 create mode 100644 tests/qapi-schema/features-name-bad-type.json
 create mode 100644 tests/qapi-schema/features-name-bad-type.out
 create mode 100644 tests/qapi-schema/features-no-list.err
 create mode 100644 tests/qapi-schema/features-no-list.exit
 create mode 100644 tests/qapi-schema/features-no-list.json
 create mode 100644 tests/qapi-schema/features-no-list.out
 create mode 100644 tests/qapi-schema/features-unknown-key.err
 create mode 100644 tests/qapi-schema/features-unknown-key.exit
 create mode 100644 tests/qapi-schema/features-unknown-key.json
 create mode 100644 tests/qapi-schema/features-unknown-key.out

diff --git a/tests/Makefile.include b/tests/Makefile.include
index 46a36c2c95..68ab8a8194 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -374,6 +374,12 @@ qapi-schema += event-boxed-empty.json
 qapi-schema += event-case.json
 qapi-schema += event-member-invalid-dict.json
 qapi-schema += event-nest-struct.json
+qapi-schema += features-bad-type.json
+qapi-schema += features-duplicate-name.json
+qapi-schema += features-missing-name.json
+qapi-schema += features-name-bad-type.json
+qapi-schema += features-no-list.json
+qapi-schema += features-unknown-key.json
 qapi-schema += flat-union-array-branch.json
 qapi-schema += flat-union-bad-base.json
 qapi-schema += flat-union-bad-discriminator.json
diff --git a/tests/qapi-schema/features-bad-type.err b/tests/qapi-schema/features-bad-type.err
new file mode 100644
index 0000000000..5fb95c2f90
--- /dev/null
+++ b/tests/qapi-schema/features-bad-type.err
@@ -0,0 +1 @@
+tests/qapi-schema/features-bad-type.json:1: Feature of struct FeatureStruct0 requires a string name
diff --git a/tests/qapi-schema/features-bad-type.exit b/tests/qapi-schema/features-bad-type.exit
new file mode 100644
index 0000000000..d00491fd7e
--- /dev/null
+++ b/tests/qapi-schema/features-bad-type.exit
@@ -0,0 +1 @@
+1
diff --git a/tests/qapi-schema/features-bad-type.json b/tests/qapi-schema/features-bad-type.json
new file mode 100644
index 0000000000..57db5540e7
--- /dev/null
+++ b/tests/qapi-schema/features-bad-type.json
@@ -0,0 +1,3 @@
+{ 'struct': 'FeatureStruct0',
+  'data': { 'foo': 'int' },
+  'features': [ [ 'a feature cannot be an array' ] ] }
diff --git a/tests/qapi-schema/features-bad-type.out b/tests/qapi-schema/features-bad-type.out
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/qapi-schema/features-duplicate-name.err b/tests/qapi-schema/features-duplicate-name.err
new file mode 100644
index 0000000000..c0a4cccae6
--- /dev/null
+++ b/tests/qapi-schema/features-duplicate-name.err
@@ -0,0 +1 @@
+tests/qapi-schema/features-duplicate-name.json:1: 'foo' (feature of FeatureStruct0) collides with 'foo' (feature of FeatureStruct0)
diff --git a/tests/qapi-schema/features-duplicate-name.exit b/tests/qapi-schema/features-duplicate-name.exit
new file mode 100644
index 0000000000..d00491fd7e
--- /dev/null
+++ b/tests/qapi-schema/features-duplicate-name.exit
@@ -0,0 +1 @@
+1
diff --git a/tests/qapi-schema/features-duplicate-name.json b/tests/qapi-schema/features-duplicate-name.json
new file mode 100644
index 0000000000..29358e6220
--- /dev/null
+++ b/tests/qapi-schema/features-duplicate-name.json
@@ -0,0 +1,3 @@
+{ 'struct': 'FeatureStruct0',
+  'data': { 'foo': 'int' },
+  'features': [ 'foo', 'bar', 'foo' ] }
diff --git a/tests/qapi-schema/features-duplicate-name.out b/tests/qapi-schema/features-duplicate-name.out
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/qapi-schema/features-missing-name.err b/tests/qapi-schema/features-missing-name.err
new file mode 100644
index 0000000000..4f1d2715aa
--- /dev/null
+++ b/tests/qapi-schema/features-missing-name.err
@@ -0,0 +1 @@
+tests/qapi-schema/features-missing-name.json:1: Key 'name' is missing from feature of struct FeatureStruct0
diff --git a/tests/qapi-schema/features-missing-name.exit b/tests/qapi-schema/features-missing-name.exit
new file mode 100644
index 0000000000..d00491fd7e
--- /dev/null
+++ b/tests/qapi-schema/features-missing-name.exit
@@ -0,0 +1 @@
+1
diff --git a/tests/qapi-schema/features-missing-name.json b/tests/qapi-schema/features-missing-name.json
new file mode 100644
index 0000000000..2314f97c00
--- /dev/null
+++ b/tests/qapi-schema/features-missing-name.json
@@ -0,0 +1,3 @@
+{ 'struct': 'FeatureStruct0',
+  'data': { 'foo': 'int' },
+  'features': [ { 'if': 'defined(NAMELESS_FEATURES)' } ] }
diff --git a/tests/qapi-schema/features-missing-name.out b/tests/qapi-schema/features-missing-name.out
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/qapi-schema/features-name-bad-type.err b/tests/qapi-schema/features-name-bad-type.err
new file mode 100644
index 0000000000..8a3eecb972
--- /dev/null
+++ b/tests/qapi-schema/features-name-bad-type.err
@@ -0,0 +1 @@
+tests/qapi-schema/features-name-bad-type.json:1: Feature of struct FeatureStruct0 requires a string name
diff --git a/tests/qapi-schema/features-name-bad-type.exit b/tests/qapi-schema/features-name-bad-type.exit
new file mode 100644
index 0000000000..d00491fd7e
--- /dev/null
+++ b/tests/qapi-schema/features-name-bad-type.exit
@@ -0,0 +1 @@
+1
diff --git a/tests/qapi-schema/features-name-bad-type.json b/tests/qapi-schema/features-name-bad-type.json
new file mode 100644
index 0000000000..b07139978a
--- /dev/null
+++ b/tests/qapi-schema/features-name-bad-type.json
@@ -0,0 +1,3 @@
+{ 'struct': 'FeatureStruct0',
+  'data': { 'foo': 'int' },
+  'features': [ { 'name': { 'feature-type': 'object' } } ] }
diff --git a/tests/qapi-schema/features-name-bad-type.out b/tests/qapi-schema/features-name-bad-type.out
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/qapi-schema/features-no-list.err b/tests/qapi-schema/features-no-list.err
new file mode 100644
index 0000000000..61ed68612b
--- /dev/null
+++ b/tests/qapi-schema/features-no-list.err
@@ -0,0 +1 @@
+tests/qapi-schema/features-no-list.json:1: Struct 'FeatureStruct0' requires an array for 'features'
diff --git a/tests/qapi-schema/features-no-list.exit b/tests/qapi-schema/features-no-list.exit
new file mode 100644
index 0000000000..d00491fd7e
--- /dev/null
+++ b/tests/qapi-schema/features-no-list.exit
@@ -0,0 +1 @@
+1
diff --git a/tests/qapi-schema/features-no-list.json b/tests/qapi-schema/features-no-list.json
new file mode 100644
index 0000000000..9484fd94fc
--- /dev/null
+++ b/tests/qapi-schema/features-no-list.json
@@ -0,0 +1,3 @@
+{ 'struct': 'FeatureStruct0',
+  'data': { 'foo': 'int' },
+  'features': 'bar' }
diff --git a/tests/qapi-schema/features-no-list.out b/tests/qapi-schema/features-no-list.out
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/qapi-schema/features-unknown-key.err b/tests/qapi-schema/features-unknown-key.err
new file mode 100644
index 0000000000..a1d693030d
--- /dev/null
+++ b/tests/qapi-schema/features-unknown-key.err
@@ -0,0 +1,2 @@
+tests/qapi-schema/features-unknown-key.json:1: Unknown key 'colour' in feature of struct FeatureStruct0
+Valid keys are 'if', 'name'.
diff --git a/tests/qapi-schema/features-unknown-key.exit b/tests/qapi-schema/features-unknown-key.exit
new file mode 100644
index 0000000000..d00491fd7e
--- /dev/null
+++ b/tests/qapi-schema/features-unknown-key.exit
@@ -0,0 +1 @@
+1
diff --git a/tests/qapi-schema/features-unknown-key.json b/tests/qapi-schema/features-unknown-key.json
new file mode 100644
index 0000000000..134df3b503
--- /dev/null
+++ b/tests/qapi-schema/features-unknown-key.json
@@ -0,0 +1,3 @@
+{ 'struct': 'FeatureStruct0',
+  'data': { 'foo': 'int' },
+  'features': [ { 'name': 'bar', 'colour': 'red' } ] }
diff --git a/tests/qapi-schema/features-unknown-key.out b/tests/qapi-schema/features-unknown-key.out
new file mode 100644
index 0000000000..e69de29bb2
-- 
2.21.0



^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [Qemu-devel] [PATCH 4/7] qapi: Disentangle QAPIDoc code
  2019-06-06 15:37 [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
                   ` (2 preceding siblings ...)
  2019-06-06 15:37 ` [Qemu-devel] [PATCH 3/7] tests/qapi-schema: Error case tests for features " Markus Armbruster
@ 2019-06-06 15:38 ` Markus Armbruster
  2019-06-06 15:38 ` [Qemu-devel] [PATCH 5/7] qapi: Allow documentation for features Markus Armbruster
                   ` (4 subsequent siblings)
  8 siblings, 0 replies; 12+ messages in thread
From: Markus Armbruster @ 2019-06-06 15:38 UTC (permalink / raw)
  To: qemu-devel; +Cc: kwolf, pkrempa, qemu-block

From: Kevin Wolf <kwolf@redhat.com>

Documentation comments follow a certain structure: First, we have a text
with a general description (called QAPIDoc.body). After this,
descriptions of the arguments follow. Finally, we have a part that
contains various named sections.

The code doesn't show this structure, but just checks various attributes
that indicate indirectly which part is being processed, so it happens to
do the right set of things in the right phase. This is hard to follow,
and adding support for documentation of features would be even harder.

This patch restructures the code so that the three parts are clearly
separated. The code becomes a bit longer, but easier to follow. The
resulting output remains unchanged.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 scripts/qapi/common.py | 127 +++++++++++++++++++++++++++++++++--------
 1 file changed, 102 insertions(+), 25 deletions(-)

diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 9e4b6c00b5..f40a2cd4c5 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -120,6 +120,24 @@ class QAPIDoc(object):
         def connect(self, member):
             self.member = member
 
+    class DocPart:
+        """
+        Describes which part of the documentation we're parsing right now.
+
+        Expression documentation blocks consist of
+        * a BODY part: first line naming the expression, plus an
+          optional overview
+        * an ARGS part: description of each argument (for commands and
+          events) or member (for structs, unions and alternates),
+        * a VARIOUS part: optional tagged sections.
+
+        Free-form documentation blocks consist only of a BODY part.
+        """
+        # TODO Make it a subclass of Enum when Python 2 support is removed
+        BODY = 1
+        ARGS = 2
+        VARIOUS = 3
+
     def __init__(self, parser, info):
         # self._parser is used to report errors with QAPIParseError.  The
         # resulting error position depends on the state of the parser.
@@ -135,6 +153,7 @@ class QAPIDoc(object):
         self.sections = []
         # the current section
         self._section = self.body
+        self._part = QAPIDoc.DocPart.BODY
 
     def has_section(self, name):
         """Return True if we have a section with this name."""
@@ -144,7 +163,27 @@ class QAPIDoc(object):
         return False
 
     def append(self, line):
-        """Parse a comment line and add it to the documentation."""
+        """
+        Parse a comment line and add it to the documentation.
+
+        The way that the line is dealt with depends on which part of
+        the documentation we're parsing right now:
+
+        BODY means that we're ready to process free-form text into
+        self.body.  A symbol name is only allowed if no other text was
+        parsed yet.  It is interpreted as the symbol name that
+        describes the currently documented object.  On getting the
+        second symbol name, we proceed to ARGS.
+
+        ARGS means that we're parsing the arguments section.  Any
+        symbol name is interpreted as an argument and an ArgSection is
+        created for it.
+
+        VARIOUS is the final part where free-form sections may appear.
+        This includes named sections such as "Return:" as well as
+        unnamed paragraphs.  Symbols are not allowed any more in this
+        part.
+        """
         line = line[1:]
         if not line:
             self._append_freeform(line)
@@ -154,37 +193,85 @@ class QAPIDoc(object):
             raise QAPIParseError(self._parser, "Missing space after #")
         line = line[1:]
 
+        if self._part == QAPIDoc.DocPart.BODY:
+            self._append_body_line(line)
+        elif self._part == QAPIDoc.DocPart.ARGS:
+            self._append_args_line(line)
+        elif self._part == QAPIDoc.DocPart.VARIOUS:
+            self._append_various_line(line)
+        else:
+            assert False
+
+    def end_comment(self):
+        self._end_section()
+
+    @staticmethod
+    def _is_section_tag(name):
+        return name in ('Returns:', 'Since:',
+                        # those are often singular or plural
+                        'Note:', 'Notes:',
+                        'Example:', 'Examples:',
+                        'TODO:')
+
+    def _append_body_line(self, line):
+        name = line.split(' ', 1)[0]
         # FIXME not nice: things like '#  @foo:' and '# @foo: ' aren't
         # recognized, and get silently treated as ordinary text
-        if self.symbol:
-            self._append_symbol_line(line)
-        elif not self.body.text and line.startswith('@'):
+        if not self.symbol and not self.body.text and line.startswith('@'):
             if not line.endswith(':'):
                 raise QAPIParseError(self._parser, "Line should end with :")
             self.symbol = line[1:-1]
             # FIXME invalid names other than the empty string aren't flagged
             if not self.symbol:
                 raise QAPIParseError(self._parser, "Invalid name")
+        elif self.symbol:
+            # We already know that we document some symbol
+            if name.startswith('@') and name.endswith(':'):
+                self._part = QAPIDoc.DocPart.ARGS
+                self._append_args_line(line)
+            elif self._is_section_tag(name):
+                self._part = QAPIDoc.DocPart.VARIOUS
+                self._append_various_line(line)
+            else:
+                self._append_freeform(line.strip())
         else:
-            self._append_freeform(line)
+            # This is free-form documentation without a symbol
+            self._append_freeform(line.strip())
 
-    def end_comment(self):
-        self._end_section()
-
-    def _append_symbol_line(self, line):
+    def _append_args_line(self, line):
         name = line.split(' ', 1)[0]
 
         if name.startswith('@') and name.endswith(':'):
             line = line[len(name)+1:]
             self._start_args_section(name[1:-1])
-        elif name in ('Returns:', 'Since:',
-                      # those are often singular or plural
-                      'Note:', 'Notes:',
-                      'Example:', 'Examples:',
-                      'TODO:'):
+        elif self._is_section_tag(name):
+            self._part = QAPIDoc.DocPart.VARIOUS
+            self._append_various_line(line)
+            return
+        elif (self._section.text.endswith('\n\n')
+              and line and not line[0].isspace()):
+            self._start_section()
+            self._part = QAPIDoc.DocPart.VARIOUS
+            self._append_various_line(line)
+            return
+
+        self._append_freeform(line.strip())
+
+    def _append_various_line(self, line):
+        name = line.split(' ', 1)[0]
+
+        if name.startswith('@') and name.endswith(':'):
+            raise QAPIParseError(self._parser,
+                                 "'%s' can't follow '%s' section"
+                                 % (name, self.sections[0].name))
+        elif self._is_section_tag(name):
             line = line[len(name)+1:]
             self._start_section(name[:-1])
 
+        if (not self._section.name or
+                not self._section.name.startswith('Example')):
+            line = line.strip()
+
         self._append_freeform(line)
 
     def _start_args_section(self, name):
@@ -194,10 +281,7 @@ class QAPIDoc(object):
         if name in self.args:
             raise QAPIParseError(self._parser,
                                  "'%s' parameter name duplicated" % name)
-        if self.sections:
-            raise QAPIParseError(self._parser,
-                                 "'@%s:' can't follow '%s' section"
-                                 % (name, self.sections[0].name))
+        assert not self.sections
         self._end_section()
         self._section = QAPIDoc.ArgSection(name)
         self.args[name] = self._section
@@ -219,13 +303,6 @@ class QAPIDoc(object):
             self._section = None
 
     def _append_freeform(self, line):
-        in_arg = isinstance(self._section, QAPIDoc.ArgSection)
-        if (in_arg and self._section.text.endswith('\n\n')
-                and line and not line[0].isspace()):
-            self._start_section()
-        if (in_arg or not self._section.name
-                or not self._section.name.startswith('Example')):
-            line = line.strip()
         match = re.match(r'(@\S+:)', line)
         if match:
             raise QAPIParseError(self._parser,
-- 
2.21.0



^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [Qemu-devel] [PATCH 5/7] qapi: Allow documentation for features
  2019-06-06 15:37 [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
                   ` (3 preceding siblings ...)
  2019-06-06 15:38 ` [Qemu-devel] [PATCH 4/7] qapi: Disentangle QAPIDoc code Markus Armbruster
@ 2019-06-06 15:38 ` Markus Armbruster
  2019-06-06 15:38 ` [Qemu-devel] [PATCH 6/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
                   ` (3 subsequent siblings)
  8 siblings, 0 replies; 12+ messages in thread
From: Markus Armbruster @ 2019-06-06 15:38 UTC (permalink / raw)
  To: qemu-devel; +Cc: kwolf, pkrempa, qemu-block

From: Kevin Wolf <kwolf@redhat.com>

Features will be documented in a new part introduced by a "Features:"
line, after arguments and before named sections.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 scripts/qapi/common.py | 43 ++++++++++++++++++++++++++++++++++++++----
 scripts/qapi/doc.py    | 12 ++++++++++++
 2 files changed, 51 insertions(+), 4 deletions(-)

diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index f40a2cd4c5..1164301edf 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -129,6 +129,7 @@ class QAPIDoc(object):
           optional overview
         * an ARGS part: description of each argument (for commands and
           events) or member (for structs, unions and alternates),
+        * a FEATURES part: description of each feature,
         * a VARIOUS part: optional tagged sections.
 
         Free-form documentation blocks consist only of a BODY part.
@@ -136,7 +137,8 @@ class QAPIDoc(object):
         # TODO Make it a subclass of Enum when Python 2 support is removed
         BODY = 1
         ARGS = 2
-        VARIOUS = 3
+        FEATURES = 3
+        VARIOUS = 4
 
     def __init__(self, parser, info):
         # self._parser is used to report errors with QAPIParseError.  The
@@ -149,6 +151,7 @@ class QAPIDoc(object):
         self.body = QAPIDoc.Section()
         # dict mapping parameter name to ArgSection
         self.args = OrderedDict()
+        self.features = OrderedDict()
         # a list of Section
         self.sections = []
         # the current section
@@ -197,6 +200,8 @@ class QAPIDoc(object):
             self._append_body_line(line)
         elif self._part == QAPIDoc.DocPart.ARGS:
             self._append_args_line(line)
+        elif self._part == QAPIDoc.DocPart.FEATURES:
+            self._append_features_line(line)
         elif self._part == QAPIDoc.DocPart.VARIOUS:
             self._append_various_line(line)
         else:
@@ -229,6 +234,8 @@ class QAPIDoc(object):
             if name.startswith('@') and name.endswith(':'):
                 self._part = QAPIDoc.DocPart.ARGS
                 self._append_args_line(line)
+            elif line == 'Features:':
+                self._part = QAPIDoc.DocPart.FEATURES
             elif self._is_section_tag(name):
                 self._part = QAPIDoc.DocPart.VARIOUS
                 self._append_various_line(line)
@@ -248,6 +255,28 @@ class QAPIDoc(object):
             self._part = QAPIDoc.DocPart.VARIOUS
             self._append_various_line(line)
             return
+        elif (self._section.text.endswith('\n\n')
+              and line and not line[0].isspace()):
+            if line == 'Features:':
+                self._part = QAPIDoc.DocPart.FEATURES
+            else:
+                self._start_section()
+                self._part = QAPIDoc.DocPart.VARIOUS
+                self._append_various_line(line)
+            return
+
+        self._append_freeform(line.strip())
+
+    def _append_features_line(self, line):
+        name = line.split(' ', 1)[0]
+
+        if name.startswith('@') and name.endswith(':'):
+            line = line[len(name)+1:]
+            self._start_features_section(name[1:-1])
+        elif self._is_section_tag(name):
+            self._part = QAPIDoc.DocPart.VARIOUS
+            self._append_various_line(line)
+            return
         elif (self._section.text.endswith('\n\n')
               and line and not line[0].isspace()):
             self._start_section()
@@ -274,17 +303,23 @@ class QAPIDoc(object):
 
         self._append_freeform(line)
 
-    def _start_args_section(self, name):
+    def _start_symbol_section(self, symbols_dict, name):
         # FIXME invalid names other than the empty string aren't flagged
         if not name:
             raise QAPIParseError(self._parser, "Invalid parameter name")
-        if name in self.args:
+        if name in symbols_dict:
             raise QAPIParseError(self._parser,
                                  "'%s' parameter name duplicated" % name)
         assert not self.sections
         self._end_section()
         self._section = QAPIDoc.ArgSection(name)
-        self.args[name] = self._section
+        symbols_dict[name] = self._section
+
+    def _start_args_section(self, name):
+        self._start_symbol_section(self.args, name)
+
+    def _start_features_section(self, name):
+        self._start_symbol_section(self.features, name)
 
     def _start_section(self, name=None):
         if name in ('Returns', 'Since') and self.has_section(name):
diff --git a/scripts/qapi/doc.py b/scripts/qapi/doc.py
index 433e9fcbfb..5fc0fc7e06 100755
--- a/scripts/qapi/doc.py
+++ b/scripts/qapi/doc.py
@@ -182,6 +182,17 @@ def texi_members(doc, what, base, variants, member_func):
     return '\n@b{%s:}\n@table @asis\n%s@end table\n' % (what, items)
 
 
+def texi_features(doc):
+    """Format the table of features"""
+    items = ''
+    for section in doc.features.values():
+        desc = texi_format(section.text)
+        items += '@item @code{%s}\n%s' % (section.name, desc)
+    if not items:
+        return ''
+    return '\n@b{Features:}\n@table @asis\n%s@end table\n' % (items)
+
+
 def texi_sections(doc, ifcond):
     """Format additional sections following arguments"""
     body = ''
@@ -201,6 +212,7 @@ def texi_entity(doc, what, ifcond, base=None, variants=None,
                 member_func=texi_member):
     return (texi_body(doc)
             + texi_members(doc, what, base, variants, member_func)
+            + texi_features(doc)
             + texi_sections(doc, ifcond))
 
 
-- 
2.21.0



^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [Qemu-devel] [PATCH 6/7] file-posix: Add dynamic-auto-read-only QAPI feature
  2019-06-06 15:37 [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
                   ` (4 preceding siblings ...)
  2019-06-06 15:38 ` [Qemu-devel] [PATCH 5/7] qapi: Allow documentation for features Markus Armbruster
@ 2019-06-06 15:38 ` Markus Armbruster
  2019-06-06 15:54   ` Eric Blake
  2019-06-06 15:38 ` [Qemu-devel] [PATCH 7/7] qapi: Simplify QAPIDoc implements its state machine Markus Armbruster
                   ` (2 subsequent siblings)
  8 siblings, 1 reply; 12+ messages in thread
From: Markus Armbruster @ 2019-06-06 15:38 UTC (permalink / raw)
  To: qemu-devel; +Cc: kwolf, pkrempa, qemu-block

From: Kevin Wolf <kwolf@redhat.com>

In commit 23dece19da4 ('file-posix: Make auto-read-only dynamic') ,
auto-read-only=on changed its behaviour in file-posix for the 4.0
release. This change cannot be detected through the usual mechanisms
like schema introspection. Add a new feature flag to the schema to
allow libvirt to detect the presence of the new behaviour.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qapi/block-core.json | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/qapi/block-core.json b/qapi/block-core.json
index 1defcde048..f5e1ee91f9 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -2859,6 +2859,15 @@
 #                         file is large, do not use in production.
 #                         (default: off) (since: 3.0)
 #
+# Features:
+# @dynamic-auto-read-only: If present, enabled auto-read-only means that the
+#                          driver will open the image read-only at first,
+#                          dynamically reopen the image file read-write when
+#                          the first writer is attached to the node and reopen
+#                          read-only when the last writer is detached. This
+#                          allows to give QEMU write permissions only on demand
+#                          when an operation actually needs write access.
+#
 # Since: 2.9
 ##
 { 'struct': 'BlockdevOptionsFile',
@@ -2868,7 +2877,9 @@
             '*aio': 'BlockdevAioOptions',
 	    '*drop-cache': {'type': 'bool',
 	                    'if': 'defined(CONFIG_LINUX)'},
-            '*x-check-cache-dropped': 'bool' } }
+            '*x-check-cache-dropped': 'bool' },
+  'features': [ { 'name': 'dynamic-auto-read-only',
+                  'if': 'defined(CONFIG_POSIX)' } ] }
 
 ##
 # @BlockdevOptionsNull:
-- 
2.21.0



^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [Qemu-devel] [PATCH 7/7] qapi: Simplify QAPIDoc implements its state machine
  2019-06-06 15:37 [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
                   ` (5 preceding siblings ...)
  2019-06-06 15:38 ` [Qemu-devel] [PATCH 6/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
@ 2019-06-06 15:38 ` Markus Armbruster
  2019-06-07 15:02 ` [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Kevin Wolf
  2019-06-12 16:45 ` Markus Armbruster
  8 siblings, 0 replies; 12+ messages in thread
From: Markus Armbruster @ 2019-06-06 15:38 UTC (permalink / raw)
  To: qemu-devel; +Cc: kwolf, pkrempa, qemu-block

QAPIDoc uses a state machine to for processing of documentation lines.
Its state is encoded as an enum QAPIDoc._state (well, as enum-like
class actually, thanks to our infatuation with Python 2).

All we ever do with the state is calling the state's function to
process a line of documentation.  The enum values effectively serve as
handles for the functions.

Eliminate the rather wordy indirection: store the function to call in
QAPIDoc._append_line.  Update and improve comments.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 scripts/qapi/common.py | 125 ++++++++++++++++++++++-------------------
 1 file changed, 68 insertions(+), 57 deletions(-)

diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 1164301edf..d61bfdc526 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -102,6 +102,24 @@ class QAPISemError(QAPIError):
 
 
 class QAPIDoc(object):
+    """
+    A documentation comment block, either expression or free-form
+
+    Expression documentation blocks consist of
+
+    * a body section: one line naming the expression, followed by an
+      overview (any number of lines)
+
+    * argument sections: a description of each argument (for commands
+      and events) or member (for structs, unions and alternates)
+
+    * features sections: a description of each feature flag
+
+    * additional (non-argument) sections, possibly tagged
+
+    Free-form documentation blocks consist only of a body section.
+    """
+
     class Section(object):
         def __init__(self, name=None):
             # optional section name (argument/member or section name)
@@ -120,26 +138,6 @@ class QAPIDoc(object):
         def connect(self, member):
             self.member = member
 
-    class DocPart:
-        """
-        Describes which part of the documentation we're parsing right now.
-
-        Expression documentation blocks consist of
-        * a BODY part: first line naming the expression, plus an
-          optional overview
-        * an ARGS part: description of each argument (for commands and
-          events) or member (for structs, unions and alternates),
-        * a FEATURES part: description of each feature,
-        * a VARIOUS part: optional tagged sections.
-
-        Free-form documentation blocks consist only of a BODY part.
-        """
-        # TODO Make it a subclass of Enum when Python 2 support is removed
-        BODY = 1
-        ARGS = 2
-        FEATURES = 3
-        VARIOUS = 4
-
     def __init__(self, parser, info):
         # self._parser is used to report errors with QAPIParseError.  The
         # resulting error position depends on the state of the parser.
@@ -156,7 +154,7 @@ class QAPIDoc(object):
         self.sections = []
         # the current section
         self._section = self.body
-        self._part = QAPIDoc.DocPart.BODY
+        self._append_line = self._append_body_line
 
     def has_section(self, name):
         """Return True if we have a section with this name."""
@@ -171,21 +169,10 @@ class QAPIDoc(object):
 
         The way that the line is dealt with depends on which part of
         the documentation we're parsing right now:
-
-        BODY means that we're ready to process free-form text into
-        self.body.  A symbol name is only allowed if no other text was
-        parsed yet.  It is interpreted as the symbol name that
-        describes the currently documented object.  On getting the
-        second symbol name, we proceed to ARGS.
-
-        ARGS means that we're parsing the arguments section.  Any
-        symbol name is interpreted as an argument and an ArgSection is
-        created for it.
-
-        VARIOUS is the final part where free-form sections may appear.
-        This includes named sections such as "Return:" as well as
-        unnamed paragraphs.  Symbols are not allowed any more in this
-        part.
+        * The body section: ._append_line is ._append_body_line
+        * An argument section: ._append_line is ._append_args_line
+        * A features section: ._append_line is ._append_features_line
+        * An additional section: ._append_line is ._append_various_line
         """
         line = line[1:]
         if not line:
@@ -195,17 +182,7 @@ class QAPIDoc(object):
         if line[0] != ' ':
             raise QAPIParseError(self._parser, "Missing space after #")
         line = line[1:]
-
-        if self._part == QAPIDoc.DocPart.BODY:
-            self._append_body_line(line)
-        elif self._part == QAPIDoc.DocPart.ARGS:
-            self._append_args_line(line)
-        elif self._part == QAPIDoc.DocPart.FEATURES:
-            self._append_features_line(line)
-        elif self._part == QAPIDoc.DocPart.VARIOUS:
-            self._append_various_line(line)
-        else:
-            assert False
+        self._append_line(line)
 
     def end_comment(self):
         self._end_section()
@@ -219,6 +196,19 @@ class QAPIDoc(object):
                         'TODO:')
 
     def _append_body_line(self, line):
+        """
+        Process a line of documentation text in the body section.
+
+        If this a symbol line and it is the section's first line, this
+        is an expression documentation block for that symbol.
+
+        If it's an expression documentation block, another symbol line
+        begins the argument section for the argument named by it, and
+        a section tag begins an additional section.  Start that
+        section and append the line to it.
+
+        Else, append the line to the current section.
+        """
         name = line.split(' ', 1)[0]
         # FIXME not nice: things like '#  @foo:' and '# @foo: ' aren't
         # recognized, and get silently treated as ordinary text
@@ -230,38 +220,49 @@ class QAPIDoc(object):
             if not self.symbol:
                 raise QAPIParseError(self._parser, "Invalid name")
         elif self.symbol:
-            # We already know that we document some symbol
+            # This is an expression documentation block
             if name.startswith('@') and name.endswith(':'):
-                self._part = QAPIDoc.DocPart.ARGS
+                self._append_line = self._append_args_line
                 self._append_args_line(line)
             elif line == 'Features:':
-                self._part = QAPIDoc.DocPart.FEATURES
+                self._append_line = self._append_features_line
             elif self._is_section_tag(name):
-                self._part = QAPIDoc.DocPart.VARIOUS
+                self._append_line = self._append_various_line
                 self._append_various_line(line)
             else:
                 self._append_freeform(line.strip())
         else:
-            # This is free-form documentation without a symbol
+            # This is a free-form documentation block
             self._append_freeform(line.strip())
 
     def _append_args_line(self, line):
+        """
+        Process a line of documentation text in an argument section.
+
+        A symbol line begins the next argument section, a section tag
+        section or a non-indented line after a blank line begins an
+        additional section.  Start that section and append the line to
+        it.
+
+        Else, append the line to the current section.
+
+        """
         name = line.split(' ', 1)[0]
 
         if name.startswith('@') and name.endswith(':'):
             line = line[len(name)+1:]
             self._start_args_section(name[1:-1])
         elif self._is_section_tag(name):
-            self._part = QAPIDoc.DocPart.VARIOUS
+            self._append_line = self._append_various_line
             self._append_various_line(line)
             return
         elif (self._section.text.endswith('\n\n')
               and line and not line[0].isspace()):
             if line == 'Features:':
-                self._part = QAPIDoc.DocPart.FEATURES
+                self._append_line = self._append_features_line
             else:
                 self._start_section()
-                self._part = QAPIDoc.DocPart.VARIOUS
+                self._append_line = self._append_various_line
                 self._append_various_line(line)
             return
 
@@ -274,19 +275,29 @@ class QAPIDoc(object):
             line = line[len(name)+1:]
             self._start_features_section(name[1:-1])
         elif self._is_section_tag(name):
-            self._part = QAPIDoc.DocPart.VARIOUS
+            self._append_line = self._append_various_line
             self._append_various_line(line)
             return
         elif (self._section.text.endswith('\n\n')
               and line and not line[0].isspace()):
             self._start_section()
-            self._part = QAPIDoc.DocPart.VARIOUS
+            self._append_line = self._append_various_line
             self._append_various_line(line)
             return
 
         self._append_freeform(line.strip())
 
     def _append_various_line(self, line):
+        """
+        Process a line of documentation text in an additional section.
+
+        A symbol line is an error.
+
+        A section tag begins an additional section.  Start that
+        section and append the line to it.
+
+        Else, append the line to the current section.
+        """
         name = line.split(' ', 1)[0]
 
         if name.startswith('@') and name.endswith(':'):
-- 
2.21.0



^ permalink raw reply related	[flat|nested] 12+ messages in thread
* Re: [Qemu-devel] [PATCH 6/7] file-posix: Add dynamic-auto-read-only QAPI feature
  2019-06-06 15:38 ` [Qemu-devel] [PATCH 6/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
@ 2019-06-06 15:54   ` Eric Blake
  2019-06-12 16:31     ` Markus Armbruster
  0 siblings, 1 reply; 12+ messages in thread
From: Eric Blake @ 2019-06-06 15:54 UTC (permalink / raw)
  To: Markus Armbruster, qemu-devel; +Cc: kwolf, pkrempa, qemu-block

[-- Attachment #1: Type: text/plain, Size: 2163 bytes --]

On 6/6/19 10:38 AM, Markus Armbruster wrote:
> From: Kevin Wolf <kwolf@redhat.com>
> 
> In commit 23dece19da4 ('file-posix: Make auto-read-only dynamic') ,
> auto-read-only=on changed its behaviour in file-posix for the 4.0
> release. This change cannot be detected through the usual mechanisms
> like schema introspection. Add a new feature flag to the schema to
> allow libvirt to detect the presence of the new behaviour.
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>  qapi/block-core.json | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/qapi/block-core.json b/qapi/block-core.json
> index 1defcde048..f5e1ee91f9 100644
> --- a/qapi/block-core.json
> +++ b/qapi/block-core.json
> @@ -2859,6 +2859,15 @@
>  #                         file is large, do not use in production.
>  #                         (default: off) (since: 3.0)
>  #
> +# Features:
> +# @dynamic-auto-read-only: If present, enabled auto-read-only means that the
> +#                          driver will open the image read-only at first,
> +#                          dynamically reopen the image file read-write when
> +#                          the first writer is attached to the node and reopen
> +#                          read-only when the last writer is detached. This
> +#                          allows to give QEMU write permissions only on demand

s/allows to give/allows giving/

> +#                          when an operation actually needs write access.
> +#
>  # Since: 2.9
>  ##
>  { 'struct': 'BlockdevOptionsFile',
> @@ -2868,7 +2877,9 @@
>              '*aio': 'BlockdevAioOptions',
>  	    '*drop-cache': {'type': 'bool',
>  	                    'if': 'defined(CONFIG_LINUX)'},
> -            '*x-check-cache-dropped': 'bool' } }
> +            '*x-check-cache-dropped': 'bool' },
> +  'features': [ { 'name': 'dynamic-auto-read-only',
> +                  'if': 'defined(CONFIG_POSIX)' } ] }
>  
>  ##
>  # @BlockdevOptionsNull:
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature
  2019-06-06 15:37 [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
                   ` (6 preceding siblings ...)
  2019-06-06 15:38 ` [Qemu-devel] [PATCH 7/7] qapi: Simplify QAPIDoc implements its state machine Markus Armbruster
@ 2019-06-07 15:02 ` Kevin Wolf
  2019-06-12 16:45 ` Markus Armbruster
  8 siblings, 0 replies; 12+ messages in thread
From: Kevin Wolf @ 2019-06-07 15:02 UTC (permalink / raw)
  To: Markus Armbruster; +Cc: pkrempa, qemu-devel, qemu-block

Am 06.06.2019 um 17:37 hat Markus Armbruster geschrieben:
> This series adds optional feature lists to struct definitions in the
> QAPI schema and makes use of them to advertise the new behaviour of
> auto-read-only=on in file-posix.

Reviewed-by: Kevin Wolf <kwolf@redhat.com>


^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [Qemu-devel] [PATCH 6/7] file-posix: Add dynamic-auto-read-only QAPI feature
  2019-06-06 15:54   ` Eric Blake
@ 2019-06-12 16:31     ` Markus Armbruster
  0 siblings, 0 replies; 12+ messages in thread
From: Markus Armbruster @ 2019-06-12 16:31 UTC (permalink / raw)
  To: Eric Blake; +Cc: kwolf, pkrempa, qemu-devel, qemu-block

Eric Blake <eblake@redhat.com> writes:

> On 6/6/19 10:38 AM, Markus Armbruster wrote:
>> From: Kevin Wolf <kwolf@redhat.com>
>> 
>> In commit 23dece19da4 ('file-posix: Make auto-read-only dynamic') ,
>> auto-read-only=on changed its behaviour in file-posix for the 4.0
>> release. This change cannot be detected through the usual mechanisms
>> like schema introspection. Add a new feature flag to the schema to
>> allow libvirt to detect the presence of the new behaviour.
>> 
>> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
>> ---
>>  qapi/block-core.json | 13 ++++++++++++-
>>  1 file changed, 12 insertions(+), 1 deletion(-)
>> 
>> diff --git a/qapi/block-core.json b/qapi/block-core.json
>> index 1defcde048..f5e1ee91f9 100644
>> --- a/qapi/block-core.json
>> +++ b/qapi/block-core.json
>> @@ -2859,6 +2859,15 @@
>>  #                         file is large, do not use in production.
>>  #                         (default: off) (since: 3.0)
>>  #
>> +# Features:
>> +# @dynamic-auto-read-only: If present, enabled auto-read-only means that the
>> +#                          driver will open the image read-only at first,
>> +#                          dynamically reopen the image file read-write when
>> +#                          the first writer is attached to the node and reopen
>> +#                          read-only when the last writer is detached. This
>> +#                          allows to give QEMU write permissions only on demand
>
> s/allows to give/allows giving/

Fixing, thanks!

>> +#                          when an operation actually needs write access.
>> +#
>>  # Since: 2.9
>>  ##
>>  { 'struct': 'BlockdevOptionsFile',
>> @@ -2868,7 +2877,9 @@
>>              '*aio': 'BlockdevAioOptions',
>>  	    '*drop-cache': {'type': 'bool',
>>  	                    'if': 'defined(CONFIG_LINUX)'},
>> -            '*x-check-cache-dropped': 'bool' } }
>> +            '*x-check-cache-dropped': 'bool' },
>> +  'features': [ { 'name': 'dynamic-auto-read-only',
>> +                  'if': 'defined(CONFIG_POSIX)' } ] }
>>  
>>  ##
>>  # @BlockdevOptionsNull:
>> 


^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature
  2019-06-06 15:37 [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
                   ` (7 preceding siblings ...)
  2019-06-07 15:02 ` [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Kevin Wolf
@ 2019-06-12 16:45 ` Markus Armbruster
  8 siblings, 0 replies; 12+ messages in thread
From: Markus Armbruster @ 2019-06-12 16:45 UTC (permalink / raw)
  To: qemu-devel; +Cc: kwolf, pkrempa, qemu-block

Markus Armbruster <armbru@redhat.com> writes:

> This series adds optional feature lists to struct definitions in the
> QAPI schema and makes use of them to advertise the new behaviour of
> auto-read-only=on in file-posix.

Queued, thanks!


^ permalink raw reply	[flat|nested] 12+ messages in thread
end of thread, other threads:[~2019-06-12 16:49 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-06-06 15:37 [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
2019-06-06 15:37 ` [Qemu-devel] [PATCH 1/7] qapi: Add feature flags to struct types Markus Armbruster
2019-06-06 15:37 ` [Qemu-devel] [PATCH 2/7] tests/qapi-schema: Test for good feature lists in structs Markus Armbruster
2019-06-06 15:37 ` [Qemu-devel] [PATCH 3/7] tests/qapi-schema: Error case tests for features " Markus Armbruster
2019-06-06 15:38 ` [Qemu-devel] [PATCH 4/7] qapi: Disentangle QAPIDoc code Markus Armbruster
2019-06-06 15:38 ` [Qemu-devel] [PATCH 5/7] qapi: Allow documentation for features Markus Armbruster
2019-06-06 15:38 ` [Qemu-devel] [PATCH 6/7] file-posix: Add dynamic-auto-read-only QAPI feature Markus Armbruster
2019-06-06 15:54   ` Eric Blake
2019-06-12 16:31     ` Markus Armbruster
2019-06-06 15:38 ` [Qemu-devel] [PATCH 7/7] qapi: Simplify QAPIDoc implements its state machine Markus Armbruster
2019-06-07 15:02 ` [Qemu-devel] [PATCH 0/7] file-posix: Add dynamic-auto-read-only QAPI feature Kevin Wolf
2019-06-12 16:45 ` Markus Armbruster

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