From nobody Tue Feb 10 07:57:33 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=yandex-team.ru Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1656106776466692.4171913660022; Fri, 24 Jun 2022 14:39:36 -0700 (PDT) Received: from localhost ([::1]:41290 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o4r1b-00007i-Ev for importer@patchew.org; Fri, 24 Jun 2022 17:39:35 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60974) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o4qs6-0000aL-UL; Fri, 24 Jun 2022 17:29:48 -0400 Received: from forwardcorp1o.mail.yandex.net ([95.108.205.193]:44584) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o4qs4-0004Tt-1j; Fri, 24 Jun 2022 17:29:46 -0400 Received: from myt5-4c5921969858.qloud-c.yandex.net (myt5-4c5921969858.qloud-c.yandex.net [IPv6:2a02:6b8:c12:3b1a:0:640:4c59:2196]) by forwardcorp1o.mail.yandex.net (Yandex) with ESMTP id 280752E1FC4; Sat, 25 Jun 2022 00:29:36 +0300 (MSK) Received: from myt6-81d8ab6a9f9d.qloud-c.yandex.net (myt6-81d8ab6a9f9d.qloud-c.yandex.net [2a02:6b8:c12:520a:0:640:81d8:ab6a]) by myt5-4c5921969858.qloud-c.yandex.net (mxbackcorp/Yandex) with ESMTP id 6w2GFjeD5i-TZJmX0cr; Sat, 25 Jun 2022 00:29:36 +0300 Received: from vsementsov-win.yandex-team.ru (unknown [2a02:6b8:b081:b64c::1:2c]) by myt6-81d8ab6a9f9d.qloud-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id KXs24KJ458-TZMSrw3v; Sat, 25 Jun 2022 00:29:35 +0300 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client certificate not present) X-Yandex-Fwd: 2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1656106176; bh=lijSqg5LJ1JaaZOfw6oh33ulutbTnqnyAmKUJfyqDPA=; h=Message-Id:References:Date:Subject:In-Reply-To:Cc:To:From; b=R4q2Ko/Uuf6iC0SjQuh0IGrnYsKZBvqscHVRpuybV+Eg6PA+3GxoFkKxligPxJePh yFmQ7x1CtRkSkjtKBn9LON4Jho0twS2nAkvvqphk4lnReZb3CuCCiSYeBr7LRrMMdU Uvi7vd7vOi+6GvkZaqmeCawnOyhCfj7C1mTEYI6Y= Authentication-Results: myt5-4c5921969858.qloud-c.yandex.net; dkim=pass header.i=@yandex-team.ru From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org Cc: qemu-devel@nongnu.org, kwolf@redhat.com, hreitz@redhat.com, vsementsov@yandex-team.ru Subject: [PATCH v6 14/15] block/snapshot: drop indirection around bdrv_snapshot_fallback_ptr Date: Sat, 25 Jun 2022 00:28:29 +0300 Message-Id: <20220624212830.316919-15-vsementsov@yandex-team.ru> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220624212830.316919-1-vsementsov@yandex-team.ru> References: <20220624212830.316919-1-vsementsov@yandex-team.ru> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=95.108.205.193; envelope-from=vsementsov@yandex-team.ru; helo=forwardcorp1o.mail.yandex.net X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @yandex-team.ru) X-ZM-MESSAGEID: 1656106777889100001 Content-Type: text/plain; charset="utf-8" Now the indirection is not actually used, we can safely reduce it to simple pointer. For consistency do a bit of refactoring to get rid of _ptr suffixes that become meaningless. Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/snapshot.c | 38 ++++++++++++++++---------------------- 1 file changed, 16 insertions(+), 22 deletions(-) diff --git a/block/snapshot.c b/block/snapshot.c index f3971ac2bd..e22ac3eac6 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -151,34 +151,29 @@ bool bdrv_snapshot_find_by_id_and_name(BlockDriverSta= te *bs, } =20 /** - * Return a pointer to the child BDS pointer to which we can fall + * Return a pointer to child of given BDS to which we can fall * back if the given BDS does not support snapshots. * Return NULL if there is no BDS to (safely) fall back to. - * - * We need to return an indirect pointer because bdrv_snapshot_goto() - * has to modify the BdrvChild pointer. */ -static BdrvChild **bdrv_snapshot_fallback_ptr(BlockDriverState *bs) +static BdrvChild *bdrv_snapshot_fallback_child(BlockDriverState *bs) { - BdrvChild **fallback; - BdrvChild *child =3D bdrv_primary_child(bs); + BdrvChild *fallback =3D bdrv_primary_child(bs); + BdrvChild *child; =20 /* We allow fallback only to primary child */ - if (!child) { + if (!fallback) { return NULL; } - fallback =3D (child =3D=3D bs->file ? &bs->file : &bs->backing); - assert(*fallback =3D=3D child); =20 /* * Check that there are no other children that would need to be * snapshotted. If there are, it is not safe to fall back to - * *fallback. + * fallback. */ QLIST_FOREACH(child, &bs->children, next) { if (child->role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | BDRV_CHILD_FILTERED) && - child !=3D *fallback) + child !=3D fallback) { return NULL; } @@ -189,8 +184,7 @@ static BdrvChild **bdrv_snapshot_fallback_ptr(BlockDriv= erState *bs) =20 static BlockDriverState *bdrv_snapshot_fallback(BlockDriverState *bs) { - BdrvChild **child_ptr =3D bdrv_snapshot_fallback_ptr(bs); - return child_ptr ? (*child_ptr)->bs : NULL; + return child_bs(bdrv_snapshot_fallback_child(bs)); } =20 int bdrv_can_snapshot(BlockDriverState *bs) @@ -237,7 +231,7 @@ int bdrv_snapshot_goto(BlockDriverState *bs, Error **errp) { BlockDriver *drv =3D bs->drv; - BdrvChild **fallback_ptr; + BdrvChild *fallback; int ret, open_ret; =20 GLOBAL_STATE_CODE(); @@ -260,13 +254,13 @@ int bdrv_snapshot_goto(BlockDriverState *bs, return ret; } =20 - fallback_ptr =3D bdrv_snapshot_fallback_ptr(bs); - if (fallback_ptr) { + fallback =3D bdrv_snapshot_fallback_child(bs); + if (fallback) { QDict *options; QDict *file_options; Error *local_err =3D NULL; - BlockDriverState *fallback_bs =3D (*fallback_ptr)->bs; - char *subqdict_prefix =3D g_strdup_printf("%s.", (*fallback_ptr)->= name); + BlockDriverState *fallback_bs =3D fallback->bs; + char *subqdict_prefix =3D g_strdup_printf("%s.", fallback->name); =20 options =3D qdict_clone_shallow(bs->options); =20 @@ -277,8 +271,8 @@ int bdrv_snapshot_goto(BlockDriverState *bs, qobject_unref(file_options); g_free(subqdict_prefix); =20 - /* Force .bdrv_open() below to re-attach fallback_bs on *fallback_= ptr */ - qdict_put_str(options, (*fallback_ptr)->name, + /* Force .bdrv_open() below to re-attach fallback_bs on fallback */ + qdict_put_str(options, fallback->name, bdrv_get_node_name(fallback_bs)); =20 /* Now close bs, apply the snapshot on fallback_bs, and re-open bs= */ @@ -287,7 +281,7 @@ int bdrv_snapshot_goto(BlockDriverState *bs, } =20 /* .bdrv_open() will re-attach it */ - bdrv_unref_child(bs, *fallback_ptr); + bdrv_unref_child(bs, fallback); =20 ret =3D bdrv_snapshot_goto(fallback_bs, snapshot_id, errp); open_ret =3D drv->bdrv_open(bs, options, bs->open_flags, &local_er= r); --=20 2.25.1