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  1. 23 3月, 2016 17 次提交
  3. 19 3月, 2016 1 次提交
    • P
      Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2016-03-18' into staging · 4829e037
      由 Peter Maydell 提交于 
      QAPI patches for 2016-03-18

# gpg: Signature made Fri 18 Mar 2016 09:54:57 GMT using RSA key ID EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"

* remotes/armbru/tags/pull-qapi-2016-03-18:
  qapi: Use anonymous bases in QMP flat unions
  qapi: Allow anonymous base for flat union
  qapi: Make BlockdevOptions doc example closer to reality
  qapi: Don't special-case simple union wrappers
  qapi: Drop unused c_null()
  qapi: Inline gen_visit_members() into lone caller
  qapi-commands: Inline single-use helpers of gen_marshal()
  qapi-commands: Utilize implicit struct visits
  qapi-event: Utilize implicit struct visits
  qapi-event: Drop qmp_output_get_qobject() null check
  qapi: Emit implicit structs in generated C
  qapi: Adjust names of implicit types
  qapi: Make c_type() more OO-like
  qapi: Fix command with named empty argument type
  qapi: Assert in places where variants are not handled
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
      4829e037
  5. 18 3月, 2016 17 次提交
    • E
      qapi: Use anonymous bases in QMP flat unions · 3666a97f
      由 Eric Blake 提交于 
      Now that the generator supports it, we might as well use an
anonymous base rather than breaking out a single-use Base
structure, for all three of our current QMP flat unions.

Oddly enough, this change does not affect the resulting
introspection output (because we already inline the members of
a base type into an object, and had no independent use of the
base type reachable from a command).

The case_whitelist now has to list the name of an implicit
type; which is not too bad (consider it a feature if it makes
it harder for developers to make the whitelist grow :)
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-16-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      3666a97f
    • E
      qapi: Allow anonymous base for flat union · ac4338f8
      由 Eric Blake 提交于 
      Rather than requiring all flat unions to explicitly create
a separate base struct, we can allow the qapi schema to specify
the common members via an inline dictionary. This is similar to
how commands can specify an inline anonymous type for its 'data'.
We already have several struct types that only exist to serve as
a single flat union's base; the next commit will clean them up.
In particular, this patch's change to the BlockdevOptions example
in qapi-code-gen.txt will actually be done in the real QAPI schema.

Now that anonymous bases are legal, we need to rework the
flat-union-bad-base negative test (as previously written, it
forms what is now valid QAPI; tweak it to now provide coverage
of a new error message path), and add a positive test in
qapi-schema-test to use an anonymous base (making the integer
argument optional, for even more coverage).

Note that this patch only allows anonymous bases for flat unions;
simple unions are already enough syntactic sugar that we do not
want to burden them further.  Meanwhile, while it would be easy
to also allow an anonymous base for structs, that would be quite
redundant, as the members can be put right into the struct
instead.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-15-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      ac4338f8
    • E
      qapi: Make BlockdevOptions doc example closer to reality · bd59adce
      由 Eric Blake 提交于 
      Although we don't want to repeat the entire BlockdevOptions
QMP command in the example, it helps if we aren't needlessly
diverging (the initial example was written before we had
committed the actual QMP interface).  Use names that match what
is found in qapi/block-core.json, such as '*read-only' rather
than 'readonly', or 'BlockdevRef' rather than 'BlockRef'.

For the simple union example, invent BlockdevOptionsSimple so
that later text is unambiguous which of the two union forms is
meant (telling the user to refer back to two 'BlockdevOptions'
wasn't nice, and QMP has only the flat union form).

Also, mention that the discriminator of a flat union is
non-optional.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-14-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      bd59adce
    • E
      qapi: Don't special-case simple union wrappers · 32bafa8f
      由 Eric Blake 提交于 
      Simple unions were carrying a special case that hid their 'data'
QMP member from the resulting C struct, via the hack method
QAPISchemaObjectTypeVariant.simple_union_type().  But by using
the work we started by unboxing flat union and alternate
branches, coupled with the ability to visit the members of an
implicit type, we can now expose the simple union's implicit
type in qapi-types.h:

| struct q_obj_ImageInfoSpecificQCow2_wrapper {
|     ImageInfoSpecificQCow2 *data;
| };
|
| struct q_obj_ImageInfoSpecificVmdk_wrapper {
|     ImageInfoSpecificVmdk *data;
| };
...
| struct ImageInfoSpecific {
|     ImageInfoSpecificKind type;
|     union { /* union tag is @type */
|         void *data;
|-        ImageInfoSpecificQCow2 *qcow2;
|-        ImageInfoSpecificVmdk *vmdk;
|+        q_obj_ImageInfoSpecificQCow2_wrapper qcow2;
|+        q_obj_ImageInfoSpecificVmdk_wrapper vmdk;
|     } u;
| };

Doing this removes asymmetry between QAPI's QMP side and its
C side (both sides now expose 'data'), and means that the
treatment of a simple union as sugar for a flat union is now
equivalent in both languages (previously the two approaches used
a different layer of dereferencing, where the simple union could
be converted to a flat union with equivalent C layout but
different {} on the wire, or to an equivalent QMP wire form
but with different C representation).  Using the implicit type
also lets us get rid of the simple_union_type() hack.

Of course, now all clients of simple unions have to adjust from
using su->u.member to using su->u.member.data; while this touches
a number of files in the tree, some earlier cleanup patches
helped minimize the change to the initialization of a temporary
variable rather than every single member access.  The generated
qapi-visit.c code is also affected by the layout change:

|@@ -7393,10 +7393,10 @@ void visit_type_ImageInfoSpecific_member
|     }
|     switch (obj->type) {
|     case IMAGE_INFO_SPECIFIC_KIND_QCOW2:
|-        visit_type_ImageInfoSpecificQCow2(v, "data", &obj->u.qcow2, &err);
|+        visit_type_q_obj_ImageInfoSpecificQCow2_wrapper_members(v, &obj->u.qcow2, &err);
|         break;
|     case IMAGE_INFO_SPECIFIC_KIND_VMDK:
|-        visit_type_ImageInfoSpecificVmdk(v, "data", &obj->u.vmdk, &err);
|+        visit_type_q_obj_ImageInfoSpecificVmdk_wrapper_members(v, &obj->u.vmdk, &err);
|         break;
|     default:
|         abort();
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-13-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      32bafa8f
    • E
      qapi: Drop unused c_null() · 861877a0
      由 Eric Blake 提交于 
      Now that we are always bulk-initializing a QAPI C struct to 0
(whether by g_malloc0() or by 'Type arg = {0};'), we no longer
have any clients of c_null() in the generator for per-element
initialization.  This patch is easy enough to revert if we find
a use in the future, but in the present, get rid of the dead code.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-12-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      861877a0
    • E
      qapi: Inline gen_visit_members() into lone caller · 12f254fd
      由 Eric Blake 提交于 
      Commit 82ca8e46 noticed that we had multiple implementations of
visiting every member of a struct, and consolidated it into
gen_visit_fields() (now gen_visit_members()) with enough
parameters to cater to slight differences between the clients.
But recent exposure of implicit types has meant that we are now
down to a single use of that method, so we can clean up the
unused conditionals and just inline it into the remaining
caller: gen_visit_object_members().

Likewise, gen_err_check() no longer needs optional parameters,
as the lone use of non-defaults was via gen_visit_members().

No change to generated code.
Suggested-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-11-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      12f254fd
    • E
      qapi-commands: Inline single-use helpers of gen_marshal() · c1ff0e6c
      由 Eric Blake 提交于 
      Originally, gen_marshal_input_visit() (or gen_visitor_input_block()
before commit f1538019) was factored out to make it easy to do two
passes of a visit to each member of a (possibly-implicit) object,
without duplicating lots of code.  But after recent changes, those
visits now occupy a single line of emitted code, and the helper
method has become a series of conditionals both before and after
the one important line, making it rather awkward to see at a glance
what gets emitted on the first (parsing) or second (deallocation)
pass.  It's a lot easier to read the generator code if we just
inline both uses directly into gen_marshal(), without all the
conditionals.

Once we've done that, it's easy to notice that gen_marshal_vars()
is used only once, and inlining it too lets us consolidate some
mcgen() calls that used to be split across helpers.

gen_call() remains a single-use helper function, but it has
enough indentation and complexity that inlining it would hamper
legibility.

No change to generated output.  The fact that the diffstat shows
a net reduction in lines is an argument in favor of this cleanup.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-10-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      c1ff0e6c
    • E
      qapi-commands: Utilize implicit struct visits · 386230a2
      由 Eric Blake 提交于 
      Rather than generate inline per-member visits, take advantage
of the 'visit_type_FOO_members()' function for command
marshalling.  This is possible now that implicit structs can be
visited like any other.  Generate call arguments from a stack-
allocated struct, rather than a list of local variables:

|@@ -57,26 +57,15 @@ void qmp_marshal_add_fd(QDict *args, QOb
|     QmpInputVisitor *qiv = qmp_input_visitor_new_strict(QOBJECT(args));
|     QapiDeallocVisitor *qdv;
|     Visitor *v;
|-    bool has_fdset_id = false;
|-    int64_t fdset_id = 0;
|-    bool has_opaque = false;
|-    char *opaque = NULL;
|+    q_obj_add_fd_arg arg = {0};
|
|     v = qmp_input_get_visitor(qiv);
|-    if (visit_optional(v, "fdset-id", &has_fdset_id)) {
|-        visit_type_int(v, "fdset-id", &fdset_id, &err);
|-        if (err) {
|-            goto out;
|-        }
|-    }
|-    if (visit_optional(v, "opaque", &has_opaque)) {
|-        visit_type_str(v, "opaque", &opaque, &err);
|-        if (err) {
|-            goto out;
|-        }
|+    visit_type_q_obj_add_fd_arg_members(v, &arg, &err);
|+    if (err) {
|+        goto out;
|     }
|
|-    retval = qmp_add_fd(has_fdset_id, fdset_id, has_opaque, opaque, &err);
|+    retval = qmp_add_fd(arg.has_fdset_id, arg.fdset_id, arg.has_opaque, arg.opaque, &err);
|     if (err) {
|         goto out;
|     }
|@@ -88,12 +77,7 @@ out:
|     qmp_input_visitor_cleanup(qiv);
|     qdv = qapi_dealloc_visitor_new();
|     v = qapi_dealloc_get_visitor(qdv);
|-    if (visit_optional(v, "fdset-id", &has_fdset_id)) {
|-        visit_type_int(v, "fdset-id", &fdset_id, NULL);
|-    }
|-    if (visit_optional(v, "opaque", &has_opaque)) {
|-        visit_type_str(v, "opaque", &opaque, NULL);
|-    }
|+    visit_type_q_obj_add_fd_arg_members(v, &arg, NULL);
|     qapi_dealloc_visitor_cleanup(qdv);
| }

This also has the nice side effect of eliminating a chance of
collision between argument QMP names and local variables.

This patch also paves the way for some followup simplifications
in the generator, in subsequent patches.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-9-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      386230a2
    • E
      qapi-event: Utilize implicit struct visits · 0949e95b
      由 Eric Blake 提交于 
      Rather than generate inline per-member visits, take advantage
of the 'visit_type_FOO_members()' function for emitting events.
This is possible now that implicit structs can be visited like
any other.  Generated code shrinks accordingly; by initializing
a struct based on parameters, through a new gen_param_var()
helper, like:

|@@ -338,6 +250,9 @@ void qapi_event_send_block_job_error(con
|     QMPEventFuncEmit emit = qmp_event_get_func_emit();
|     QmpOutputVisitor *qov;
|     Visitor *v;
|+    q_obj_BLOCK_JOB_ERROR_arg param = {
|+        (char *)device, operation, action
|+    };
|
|     if (!emit) {
|         return;
@@ -351,19 +266,7 @@ void qapi_event_send_block_job_error(con
|     if (err) {
|         goto out;
|     }
|-    visit_type_str(v, "device", (char **)&device, &err);
|-    if (err) {
|-        goto out_obj;
|-    }
|-    visit_type_IoOperationType(v, "operation", &operation, &err);
|-    if (err) {
|-        goto out_obj;
|-    }
|-    visit_type_BlockErrorAction(v, "action", &action, &err);
|-    if (err) {
|-        goto out_obj;
|-    }
|-out_obj:
|+    visit_type_q_obj_BLOCK_JOB_ERROR_arg_members(v, &param, &err);
|     visit_end_struct(v, err ? NULL : &err);

Notice that the initialization of 'param' has to cast away const
(just as the old gen_visit_members() had to do): we can't change
the signature of the user function (which uses 'const char *'), but
have to assign it to a non-const QAPI object (which requires
'char *').

While touching this, document with a FIXME comment that there is
still a potential collision between QMP members and our choice of
local variable names within qapi_event_send_FOO().

This patch also paves the way for some followup simplifications
in the generator, in subsequent patches.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-8-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      0949e95b
    • E
      qapi-event: Drop qmp_output_get_qobject() null check · 8df59565
      由 Eric Blake 提交于 
      qmp_output_get_qobject() was changed never to return null some time
ago (in commit 6c2f9a15), but the qapi_event_send_FOO() functions
still check.  Clean that up:

|@@ -28,7 +28,6 @@ void qapi_event_send_acpi_device_ost(ACP
|     QMPEventFuncEmit emit;
|     QmpOutputVisitor *qov;
|     Visitor *v;
|-    QObject *obj;
|
|     emit = qmp_event_get_func_emit();
|     if (!emit) {
|@@ -54,10 +53,7 @@ out_obj:
|         goto out;
|     }
|
|-    obj = qmp_output_get_qobject(qov);
|-    g_assert(obj);
|-
|-    qdict_put_obj(qmp, "data", obj);
|+    qdict_put_obj(qmp, "data", qmp_output_get_qobject(qov));
|     emit(QAPI_EVENT_ACPI_DEVICE_OST, qmp, &err);
|
| out:
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-7-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      8df59565
    • E
      qapi: Emit implicit structs in generated C · 7ce106a9
      由 Eric Blake 提交于 
      We already have several places that want to visit all the members
of an implicit object within a larger context (simple union variant,
event with anonymous data, command with anonymous arguments struct);
and will be adding another one soon (the ability to declare an
anonymous base for a flat union).  Having a C struct declared for
these implicit types, along with a visit_type_FOO_members() helper
function, will make for fewer special cases in our generator.

We do not, however, need qapi_free_FOO() or visit_type_FOO()
functions for implicit types, because they should not be used
directly outside of the generated code.  This is done by adding a
conditional in visit_object_type() for both qapi-types.py and
qapi-visit.py based on the object name.  The comparison of
"name.startswith('q_')" is a bit hacky (it's basically duplicating
what .is_implicit() already uses), but beats changing the signature
of the visit_object_type() callback to pass a new 'implicit' flag.
The hack should be temporary: we are considering adding a future
patch that consolidates the narrow visit_object_type(..., base,
local_members, variants) and visit_object_type_flat(...,
all_members, variants) [where different sets of information are
already broken out, and the QAPISchemaObjectType is no longer
available] into a broader visit_object_type(obj_type) [where the
visitor can query the needed fields from obj_type directly].

Also, now that we WANT to output C code for implicits, we no longer
need the visit_needed() filter, leaving 'q_empty' as the only object
still needing a special case.  Remember, 'q_empty' is the only
built-in generated object, which means that without a special case
it would be emitted in multiple files (the main qapi-types.h and in
qga-qapi-types.h) causing compilation failure due to redefinition.
But since it has no members, it's easier to just avoid an attempt to
visit that particular type; since gen_object() is called recursively,
we also prime the objects_seen set to cover any recursion into the
empty type.

The patch relies on the changed naming of implicit types in the
previous patch.  It is a bit unfortunate that the generated struct
names and visit_type_FOO_members() don't match normal naming
conventions, but it's not too bad, since they will only be used in
generated code.

The generated code grows substantially in size: the implicit
'-wrapper' types must be emitted in qapi-types.h before any union
can include an unboxed member of that type.  Arguably, the '-args'
types could be emitted in a private header for just qapi-visit.c
and qmp-marshal.c, rather than polluting qapi-types.h; but adding
complexity to the generator to split the output location according
to role doesn't seem worth the maintenance costs.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-6-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      7ce106a9
    • E
      qapi: Adjust names of implicit types · 7599697c
      由 Eric Blake 提交于 
      The original choice of ':obj-' as the prefix for implicit types
made it obvious that we weren't going to clash with any user-defined
names, which cannot contain ':'.  But now we want to create structs
for implicit types, to get rid of special cases in the generators,
and our use of ':' in implicit names needs a tweak to produce valid
C code.

We could transliterate ':' to '_', except that C99 mandates that
"identifiers that begin with an underscore are always reserved for
use as identifiers with file scope in both the ordinary and tag name
spaces".  So it's time to change our naming convention: we can
instead use the 'q_' prefix that we reserved for ourselves back in
commit 9fb081e0.  Technically, since we aren't planning on exposing
the empty type in generated code, we could keep the name ':empty',
but renaming it to 'q_empty' makes the check for startswith('q_')
cover all implicit types, whether or not code is generated for them.

As long as we don't declare 'empty' or 'obj' ticklish, it shouldn't
clash with c_name() prepending 'q_' to the user's ticklish names.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-5-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      7599697c
    • E
      qapi: Make c_type() more OO-like · 4040d995
      由 Eric Blake 提交于 
      QAPISchemaType.c_type() is a bit awkward: it takes two optional
boolean flags is_param and is_unboxed, and they should never both
be True.

Add a new method for each of the flags, and drop the flags from
c_type().

Most callers pass no flags; they remain unchanged.

One caller passes is_param=True; call the new .c_param_type()
instead.

One caller passes is_unboxed=True, except for simple union types.
This is actually an ugly special case that will go away soon, so
until then, we now have to call either .c_type() or the new
.c_unboxed_type().  Tolerable in the interim.

It requires slightly more Python, but is arguably easier to read.
Suggested-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-4-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      4040d995
    • E
      qapi: Fix command with named empty argument type · 972a1101
      由 Eric Blake 提交于 
      The generator special-cased

 { 'command':'foo', 'data': {} }

to avoid emitting a visitor variable, but failed to see that

 { 'struct':'NamedEmptyType, 'data': {} }
 { 'command':'foo', 'data':'NamedEmptyType' }

needs the same treatment.  There, the generator happily generates a
visitor to get no arguments, and a visitor to destroy no arguments;
and the compiler isn't happy with that, as demonstrated by the updated
qapi-schema-test.json:

  tests/test-qmp-marshal.c: In function ‘qmp_marshal_user_def_cmd0’:
  tests/test-qmp-marshal.c:264:14: error: variable ‘v’ set but not used [-Werror=unused-but-set-variable]
       Visitor *v;
                ^

No change to generated code except for the testsuite addition.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-3-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      972a1101
    • E
      qapi: Assert in places where variants are not handled · 29f6bd15
      由 Eric Blake 提交于 
      We are getting closer to the point where we could use one union
as the base or variant type within another union type (as long
as there are no collisions between any possible combination of
member names allowed across all discriminator choices).  But
until we get to that point, it is worth asserting that variants
are not present in places where we are not prepared to handle
them: when exploding a type into a parameter list, we do not
expect variants.  The qapi.py code is already checking this,
via the older check_type() method; but someday we hope to get
rid of that and move checking into QAPISchema*.check().  The
two asserts added here make sure any refactoring still catches
problems, and makes it locally obvious why we can iterate over
only type.members without worrying about type.variants.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-2-git-send-email-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
      29f6bd15
    • P
      Merge remote-tracking branch 'remotes/berrange/tags/pull-qcrypto-2016-03-17-3' into staging · 879c26fb
      由 Peter Maydell 提交于 
      Merge QCrypto 2016/03/17 v3

# gpg: Signature made Thu 17 Mar 2016 16:51:32 GMT using RSA key ID 15104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>"
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>"

* remotes/berrange/tags/pull-qcrypto-2016-03-17-3:
  crypto: implement the LUKS block encryption format
  crypto: add block encryption framework
  crypto: wire up XTS mode for cipher APIs
  crypto: refactor code for dealing with AES cipher
  crypto: import an implementation of the XTS cipher mode
  crypto: add support for the twofish cipher algorithm
  crypto: add support for the serpent cipher algorithm
  crypto: add support for the cast5-128 cipher algorithm
  crypto: skip testing of unsupported cipher algorithms
  crypto: add support for anti-forensic split algorithm
  crypto: add support for generating initialization vectors
  crypto: add support for PBKDF2 algorithm
  crypto: add cryptographic random byte source
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
      879c26fb
    • D
      crypto: implement the LUKS block encryption format · 3e308f20
      由 Daniel P. Berrange 提交于 
      Provide a block encryption implementation that follows the
LUKS/dm-crypt specification.

This supports all combinations of hash, cipher algorithm,
cipher mode and iv generator that are implemented by the
current crypto layer.

There is support for opening existing volumes formatted
by dm-crypt, and for formatting new volumes. In the latter
case it will only use key slot 0.
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
      3e308f20
  7. 17 3月, 2016 5 次提交