From patchwork Thu Mar 29 15:48:33 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= X-Patchwork-Id: 892839 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40Bq6f062Wz9s0t for ; Fri, 30 Mar 2018 02:53:46 +1100 (AEDT) Received: from localhost ([::1]:35320 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f1Zrz-00006g-H4 for incoming@patchwork.ozlabs.org; Thu, 29 Mar 2018 11:53:43 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48133) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f1ZnJ-0005AK-OJ for qemu-devel@nongnu.org; Thu, 29 Mar 2018 11:48:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f1ZnH-0006as-KZ for qemu-devel@nongnu.org; Thu, 29 Mar 2018 11:48:53 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:38470 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1f1ZnH-0006aN-GA for qemu-devel@nongnu.org; Thu, 29 Mar 2018 11:48:51 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0D1944068024 for ; Thu, 29 Mar 2018 15:48:51 +0000 (UTC) Received: from localhost (ovpn-112-62.ams2.redhat.com [10.36.112.62]) by smtp.corp.redhat.com (Postfix) with ESMTP id 69466215CDC5; Thu, 29 Mar 2018 15:48:50 +0000 (UTC) From: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= To: qemu-devel@nongnu.org Date: Thu, 29 Mar 2018 17:48:33 +0200 Message-Id: <20180329154833.566-5-marcandre.lureau@redhat.com> In-Reply-To: <20180329154833.566-1-marcandre.lureau@redhat.com> References: <20180329154833.566-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.5]); Thu, 29 Mar 2018 15:48:51 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.5]); Thu, 29 Mar 2018 15:48:51 +0000 (UTC) for IP:'10.11.54.6' DOMAIN:'int-mx06.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'marcandre.lureau@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH v3 4/4] qobject: modify qobject_ref() to assert on NULL and return obj X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: armbru@redhat.com, =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , pbonzini@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Following a discussion on the mailing list: while it may be convenient to accept NULL value in qobject_unref() (for similar reasons as free() accepts NULL), it is a probably a bad idea to accept NULL argument in qobject_ref(). Furthermore, it is convenient and more clear to call qobject_ref() at the time when the reference is associated with a variable, or argument. For this reason, make qobject_ref() return the same pointer as given. Signed-off-by: Marc-André Lureau --- include/qapi/qmp/qobject.h | 15 ++++++++++----- block.c | 8 ++++---- block/blkdebug.c | 7 +++---- block/blkverify.c | 8 ++++---- block/null.c | 3 +-- block/nvme.c | 3 +-- block/quorum.c | 4 ++-- monitor.c | 19 +++++++------------ qapi/qobject-input-visitor.c | 6 ++---- qapi/qobject-output-visitor.c | 7 +++---- qobject/qdict.c | 33 +++++++++++---------------------- 11 files changed, 48 insertions(+), 65 deletions(-) diff --git a/include/qapi/qmp/qobject.h b/include/qapi/qmp/qobject.h index 4183d81f00..bd3a618a73 100644 --- a/include/qapi/qmp/qobject.h +++ b/include/qapi/qmp/qobject.h @@ -70,11 +70,11 @@ static inline void qobject_init(QObject *obj, QType type) obj->base.type = type; } -static inline void qobject_ref(QObject *obj) +static inline void *qobject_ref(QObject *obj) { - if (obj) { - obj->base.refcnt++; - } + assert(obj); + obj->base.refcnt++; + return obj; } /** @@ -101,13 +101,18 @@ static inline void qobject_unref(QObject *obj) /** * qobject_ref(): Increment QObject's reference count + * @obj: a #QObject or children type instance (must not be NULL) + * + * Returns: the same @obj. The type of @obj will be propagated to the + * return type. */ #define qobject_ref(obj) \ - qobject_ref(QOBJECT(obj)) + (typeof(obj)) qobject_ref(QOBJECT(obj)) /** * qobject_unref(): Decrement QObject's reference count, deallocate * when it reaches zero + * @obj: a #QObject or children type instance (can be NULL) */ #define qobject_unref(obj) \ qobject_unref(QOBJECT(obj)) diff --git a/block.c b/block.c index 55a79845be..676e57f562 100644 --- a/block.c +++ b/block.c @@ -5134,8 +5134,8 @@ static bool append_open_options(QDict *d, BlockDriverState *bs) continue; } - qobject_ref(qdict_entry_value(entry)); - qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry)); + qdict_put_obj(d, qdict_entry_key(entry), + qobject_ref(qdict_entry_value(entry))); found_any = true; } @@ -5207,8 +5207,8 @@ void bdrv_refresh_filename(BlockDriverState *bs) * suffices without querying the (exact_)filename of this BDS. */ if (bs->file->bs->full_open_options) { qdict_put_str(opts, "driver", drv->format_name); - qobject_ref(bs->file->bs->full_open_options); - qdict_put(opts, "file", bs->file->bs->full_open_options); + qdict_put(opts, "file", + qobject_ref(bs->file->bs->full_open_options)); bs->full_open_options = opts; } else { diff --git a/block/blkdebug.c b/block/blkdebug.c index 689703d386..053372c22e 100644 --- a/block/blkdebug.c +++ b/block/blkdebug.c @@ -845,13 +845,12 @@ static void blkdebug_refresh_filename(BlockDriverState *bs, QDict *options) opts = qdict_new(); qdict_put_str(opts, "driver", "blkdebug"); - qobject_ref(bs->file->bs->full_open_options); - qdict_put(opts, "image", bs->file->bs->full_open_options); + qdict_put(opts, "image", qobject_ref(bs->file->bs->full_open_options)); for (e = qdict_first(options); e; e = qdict_next(options, e)) { if (strcmp(qdict_entry_key(e), "x-image")) { - qobject_ref(qdict_entry_value(e)); - qdict_put_obj(opts, qdict_entry_key(e), qdict_entry_value(e)); + qdict_put_obj(opts, qdict_entry_key(e), + qobject_ref(qdict_entry_value(e))); } } diff --git a/block/blkverify.c b/block/blkverify.c index 3cffcb1ca6..754cc9e857 100644 --- a/block/blkverify.c +++ b/block/blkverify.c @@ -291,10 +291,10 @@ static void blkverify_refresh_filename(BlockDriverState *bs, QDict *options) QDict *opts = qdict_new(); qdict_put_str(opts, "driver", "blkverify"); - qobject_ref(bs->file->bs->full_open_options); - qdict_put(opts, "raw", bs->file->bs->full_open_options); - qobject_ref(s->test_file->bs->full_open_options); - qdict_put(opts, "test", s->test_file->bs->full_open_options); + qdict_put(opts, "raw", + qobject_ref(bs->file->bs->full_open_options)); + qdict_put(opts, "test", + qobject_ref(s->test_file->bs->full_open_options)); bs->full_open_options = opts; } diff --git a/block/null.c b/block/null.c index 700a2d0857..3944550f67 100644 --- a/block/null.c +++ b/block/null.c @@ -244,7 +244,6 @@ static int coroutine_fn null_co_block_status(BlockDriverState *bs, static void null_refresh_filename(BlockDriverState *bs, QDict *opts) { - qobject_ref(opts); qdict_del(opts, "filename"); if (!qdict_size(opts)) { @@ -253,7 +252,7 @@ static void null_refresh_filename(BlockDriverState *bs, QDict *opts) } qdict_put_str(opts, "driver", bs->drv->format_name); - bs->full_open_options = opts; + bs->full_open_options = qobject_ref(opts); } static BlockDriver bdrv_null_co = { diff --git a/block/nvme.c b/block/nvme.c index e192da9ee1..6f71122bf5 100644 --- a/block/nvme.c +++ b/block/nvme.c @@ -1073,7 +1073,6 @@ static int nvme_reopen_prepare(BDRVReopenState *reopen_state, static void nvme_refresh_filename(BlockDriverState *bs, QDict *opts) { - qobject_ref(opts); qdict_del(opts, "filename"); if (!qdict_size(opts)) { @@ -1082,7 +1081,7 @@ static void nvme_refresh_filename(BlockDriverState *bs, QDict *opts) } qdict_put_str(opts, "driver", bs->drv->format_name); - bs->full_open_options = opts; + bs->full_open_options = qobject_ref(opts); } static void nvme_refresh_limits(BlockDriverState *bs, Error **errp) diff --git a/block/quorum.c b/block/quorum.c index 862cea366d..a5051da56e 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -1082,8 +1082,8 @@ static void quorum_refresh_filename(BlockDriverState *bs, QDict *options) children = qlist_new(); for (i = 0; i < s->num_children; i++) { - qobject_ref(s->children[i]->bs->full_open_options); - qlist_append(children, s->children[i]->bs->full_open_options); + qlist_append(children, + qobject_ref(s->children[i]->bs->full_open_options)); } opts = qdict_new(); diff --git a/monitor.c b/monitor.c index 9d2b89431e..c149cf9e96 100644 --- a/monitor.c +++ b/monitor.c @@ -494,9 +494,8 @@ static void monitor_json_emitter(Monitor *mon, QObject *data) * caller won't free the data (which will be finally freed in * responder thread). */ - qobject_ref(data); qemu_mutex_lock(&mon->qmp.qmp_queue_lock); - g_queue_push_tail(mon->qmp.qmp_responses, data); + g_queue_push_tail(mon->qmp.qmp_responses, qobject_ref(data)); qemu_mutex_unlock(&mon->qmp.qmp_queue_lock); qemu_bh_schedule(mon_global.qmp_respond_bh); } else { @@ -614,8 +613,7 @@ monitor_qapi_event_queue(QAPIEvent event, QDict *qdict, Error **errp) * replacing a prior stored event if any. */ qobject_unref(evstate->qdict); - evstate->qdict = qdict; - qobject_ref(evstate->qdict); + evstate->qdict = qobject_ref(qdict); } else { /* * Last send was (at least) evconf->rate ns ago. @@ -629,8 +627,7 @@ monitor_qapi_event_queue(QAPIEvent event, QDict *qdict, Error **errp) evstate = g_new(MonitorQAPIEventState, 1); evstate->event = event; - evstate->data = data; - qobject_ref(evstate->data); + evstate->data = qobject_ref(data); evstate->qdict = NULL; evstate->timer = timer_new_ns(event_clock_type, monitor_qapi_event_handler, @@ -4049,8 +4046,7 @@ static void monitor_qmp_respond(Monitor *mon, QObject *rsp, if (rsp) { if (id) { /* This is for the qdict below. */ - qobject_ref(id); - qdict_put_obj(qobject_to(QDict, rsp), "id", id); + qdict_put_obj(qobject_to(QDict, rsp), "id", qobject_ref(id)); } monitor_json_emitter(mon, rsp); @@ -4190,15 +4186,14 @@ static void handle_qmp_command(JSONMessageParser *parser, GQueue *tokens) goto err; } - qobject_ref(id); - qdict_del(qdict, "id"); - req_obj = g_new0(QMPRequest, 1); req_obj->mon = mon; - req_obj->id = id; + req_obj->id = id ? qobject_ref(id) : NULL; req_obj->req = req; req_obj->need_resume = false; + qdict_del(qdict, "id"); + if (qmp_is_oob(qdict)) { /* Out-Of-Band (OOB) requests are executed directly in parser. */ trace_monitor_qmp_cmd_out_of_band(qobject_get_try_str(req_obj->id) diff --git a/qapi/qobject-input-visitor.c b/qapi/qobject-input-visitor.c index 7a290c4a3f..da57f4cc24 100644 --- a/qapi/qobject-input-visitor.c +++ b/qapi/qobject-input-visitor.c @@ -588,8 +588,7 @@ static void qobject_input_type_any(Visitor *v, const char *name, QObject **obj, return; } - qobject_ref(qobj); - *obj = qobj; + *obj = qobject_ref(qobj); } static void qobject_input_type_null(Visitor *v, const char *name, @@ -677,8 +676,7 @@ static QObjectInputVisitor *qobject_input_visitor_base_new(QObject *obj) v->visitor.optional = qobject_input_optional; v->visitor.free = qobject_input_free; - v->root = obj; - qobject_ref(obj); + v->root = qobject_ref(obj); return v; } diff --git a/qapi/qobject-output-visitor.c b/qapi/qobject-output-visitor.c index 3a933b489b..89ffd8a7bf 100644 --- a/qapi/qobject-output-visitor.c +++ b/qapi/qobject-output-visitor.c @@ -188,8 +188,8 @@ static void qobject_output_type_any(Visitor *v, const char *name, QObject **obj, Error **errp) { QObjectOutputVisitor *qov = to_qov(v); - qobject_ref(*obj); - qobject_output_add_obj(qov, name, *obj); + + qobject_output_add_obj(qov, name, qobject_ref(*obj)); } static void qobject_output_type_null(Visitor *v, const char *name, @@ -210,8 +210,7 @@ static void qobject_output_complete(Visitor *v, void *opaque) assert(qov->root && QSLIST_EMPTY(&qov->stack)); assert(opaque == qov->result); - qobject_ref(qov->root); - *qov->result = qov->root; + *qov->result = qobject_ref(qov->root); qov->result = NULL; } diff --git a/qobject/qdict.c b/qobject/qdict.c index 2e9bd53e22..22800eeceb 100644 --- a/qobject/qdict.c +++ b/qobject/qdict.c @@ -373,8 +373,7 @@ QDict *qdict_clone_shallow(const QDict *src) for (i = 0; i < QDICT_BUCKET_MAX; i++) { QLIST_FOREACH(entry, &src->table[i], next) { - qobject_ref(entry->value); - qdict_put_obj(dest, entry->key, entry->value); + qdict_put_obj(dest, entry->key, qobject_ref(entry->value)); } } @@ -480,8 +479,7 @@ void qdict_copy_default(QDict *dst, QDict *src, const char *key) val = qdict_get(src, key); if (val) { - qobject_ref(val); - qdict_put_obj(dst, key, val); + qdict_put_obj(dst, key, qobject_ref(val)); } } @@ -526,8 +524,7 @@ static void qdict_flatten_qlist(QList *qlist, QDict *target, const char *prefix) qdict_flatten_qlist(qobject_to(QList, value), target, new_key); } else { /* All other types are moved to the target unchanged. */ - qobject_ref(value); - qdict_put_obj(target, new_key, value); + qdict_put_obj(target, new_key, qobject_ref(value)); } g_free(new_key); @@ -566,8 +563,7 @@ static void qdict_flatten_qdict(QDict *qdict, QDict *target, const char *prefix) delete = true; } else if (prefix) { /* All other objects are moved to the target unchanged. */ - qobject_ref(value); - qdict_put_obj(target, new_key, value); + qdict_put_obj(target, new_key, qobject_ref(value)); delete = true; } @@ -610,8 +606,7 @@ void qdict_extract_subqdict(QDict *src, QDict **dst, const char *start) while (entry != NULL) { next = qdict_next(src, entry); if (strstart(entry->key, start, &p)) { - qobject_ref(entry->value); - qdict_put_obj(*dst, p, entry->value); + qdict_put_obj(*dst, p, qobject_ref(entry->value)); qdict_del(src, entry->key); } entry = next; @@ -894,16 +889,14 @@ QObject *qdict_crumple(const QDict *src, Error **errp) qdict_put_obj(two_level, prefix, QOBJECT(child_dict)); } - qobject_ref(ent->value); - qdict_put_obj(child_dict, suffix, ent->value); + qdict_put_obj(child_dict, suffix, qobject_ref(ent->value)); } else { if (child) { error_setg(errp, "Key %s prefix is already set as a dict", prefix); goto error; } - qobject_ref(ent->value); - qdict_put_obj(two_level, prefix, ent->value); + qdict_put_obj(two_level, prefix, qobject_ref(ent->value)); } g_free(prefix); @@ -924,8 +917,7 @@ QObject *qdict_crumple(const QDict *src, Error **errp) qdict_put_obj(multi_level, ent->key, child); } else { - qobject_ref(ent->value); - qdict_put_obj(multi_level, ent->key, ent->value); + qdict_put_obj(multi_level, ent->key, qobject_ref(ent->value)); } } qobject_unref(two_level); @@ -951,8 +943,7 @@ QObject *qdict_crumple(const QDict *src, Error **errp) goto error; } - qobject_ref(child); - qlist_append_obj(qobject_to(QList, dst), child); + qlist_append_obj(qobject_to(QList, dst), qobject_ref(child)); } qobject_unref(multi_level); multi_level = NULL; @@ -1055,8 +1046,7 @@ void qdict_join(QDict *dest, QDict *src, bool overwrite) next = qdict_next(src, entry); if (overwrite || !qdict_haskey(dest, entry->key)) { - qobject_ref(entry->value); - qdict_put_obj(dest, entry->key, entry->value); + qdict_put_obj(dest, entry->key, qobject_ref(entry->value)); qdict_del(src, entry->key); } @@ -1088,8 +1078,7 @@ bool qdict_rename_keys(QDict *qdict, const QDictRenames *renames, Error **errp) } qobj = qdict_get(qdict, renames->from); - qobject_ref(qobj); - qdict_put_obj(qdict, renames->to, qobj); + qdict_put_obj(qdict, renames->to, qobject_ref(qobj)); qdict_del(qdict, renames->from); }