From nobody Mon Feb 9 21:36:52 2026 Delivered-To: importer@patchew.org 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; Authentication-Results: mx.zohomail.com; dkim=fail; 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=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1574937983; cv=none; d=zohomail.com; s=zohoarc; b=ESe/6/BuuQnm4fsPKhf+8QuNNgSvSgi8nvuS/Btm30bGoyLcFOIt1dTDnT8eT/67fq45HdXQeRBaVpvj1rO3B7fLA2ri/75D7lVoGhZWM03ae0alndPjCiPO/fLvT/e6nAu5B2ggOtfi6Ch6V6AwHKBa539bwIOdatEEtS5IDzo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1574937983; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=5D/pkDJCK2cS43Bw1M9Bu1vuuXBxNgDOLQ+LuhjnYnQ=; b=EyOwNujO2kwG8d3gO2CJSMfwf2EvD4R6nPFhnsqG7RrOPS2Atbjt6WFmA7eqzYIGh4rhXGF6C97ZwvWIZE2jNGPBmAFgksplY8Decj2R7GXdP9lBQdNjuNGgSidCK693rMXUXYKg7VwSxv06wFVih/mpNCNk7DKfS/lgsG5aW0M= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; 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=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1574937983861430.2842938801508; Thu, 28 Nov 2019 02:46:23 -0800 (PST) Received: from localhost ([::1]:47500 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iaHJW-0005Xi-Gw for importer@patchew.org; Thu, 28 Nov 2019 05:46:22 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:52175) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iaHF6-0003Rl-OF for qemu-devel@nongnu.org; Thu, 28 Nov 2019 05:41:50 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iaHF4-0006XH-2a for qemu-devel@nongnu.org; Thu, 28 Nov 2019 05:41:47 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:24207 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iaHF3-0006Tw-PB for qemu-devel@nongnu.org; Thu, 28 Nov 2019 05:41:45 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-440-LSB13DW3NACDaYCq0Zi-Zw-1; Thu, 28 Nov 2019 05:41:44 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 28907800D41; Thu, 28 Nov 2019 10:41:43 +0000 (UTC) Received: from dritchie.redhat.com (unknown [10.33.36.152]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8C73010013A7; Thu, 28 Nov 2019 10:41:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574937705; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5D/pkDJCK2cS43Bw1M9Bu1vuuXBxNgDOLQ+LuhjnYnQ=; b=WElqqkQEvC77OrILEkDw/7SvoHvZNccF1I5nKbiJPVHmIkJvDhTiVT5pfbLVNtQL13lE1Q SYt/c5S9b3Q8V9lD7Uz1SHnSywlrXIHJHFfxzrsztHKUFDQJuBByuHd31CGNIoWVIbQVmR NjVCv2rD+0OhJQC1zDGzrw+LvGLEVLo= From: Sergio Lopez To: qemu-devel@nongnu.org Subject: [PATCH v5 4/4] blockdev: honor bdrv_try_set_aio_context() context requirements Date: Thu, 28 Nov 2019 11:41:29 +0100 Message-Id: <20191128104129.250206-5-slp@redhat.com> In-Reply-To: <20191128104129.250206-1-slp@redhat.com> References: <20191128104129.250206-1-slp@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-MC-Unique: LSB13DW3NACDaYCq0Zi-Zw-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Sergio Lopez , Markus Armbruster , qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" bdrv_try_set_aio_context() requires that the old context is held, and the new context is not held. Fix all the occurrences where it's not done this way. Suggested-by: Max Reitz Signed-off-by: Sergio Lopez --- blockdev.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 62 insertions(+), 10 deletions(-) diff --git a/blockdev.c b/blockdev.c index 152a0f7454..e33abd7fd2 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1535,6 +1535,7 @@ static void external_snapshot_prepare(BlkActionState = *common, DO_UPCAST(ExternalSnapshotState, common, comm= on); TransactionAction *action =3D common->action; AioContext *aio_context; + AioContext *old_context; int ret; =20 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar @@ -1675,7 +1676,16 @@ static void external_snapshot_prepare(BlkActionState= *common, goto out; } =20 + /* Honor bdrv_try_set_aio_context() context acquisition requirements. = */ + old_context =3D bdrv_get_aio_context(state->new_bs); + aio_context_release(aio_context); + aio_context_acquire(old_context); + ret =3D bdrv_try_set_aio_context(state->new_bs, aio_context, errp); + + aio_context_release(old_context); + aio_context_acquire(aio_context); + if (ret < 0) { goto out; } @@ -1775,11 +1785,13 @@ static void drive_backup_prepare(BlkActionState *co= mmon, Error **errp) BlockDriverState *target_bs; BlockDriverState *source =3D NULL; AioContext *aio_context; + AioContext *old_context; QDict *options; Error *local_err =3D NULL; int flags; int64_t size; bool set_backing_hd =3D false; + int ret; =20 assert(common->action->type =3D=3D TRANSACTION_ACTION_KIND_DRIVE_BACKU= P); backup =3D common->action->u.drive_backup.data; @@ -1868,6 +1880,20 @@ static void drive_backup_prepare(BlkActionState *com= mon, Error **errp) goto out; } =20 + /* Honor bdrv_try_set_aio_context() context acquisition requirements. = */ + old_context =3D bdrv_get_aio_context(target_bs); + aio_context_release(aio_context); + aio_context_acquire(old_context); + + ret =3D bdrv_try_set_aio_context(target_bs, aio_context, errp); + + aio_context_release(old_context); + aio_context_acquire(aio_context); + + if (ret < 0) { + goto out; + } + if (set_backing_hd) { bdrv_set_backing_hd(target_bs, source, &local_err); if (local_err) { @@ -1947,6 +1973,8 @@ static void blockdev_backup_prepare(BlkActionState *c= ommon, Error **errp) BlockDriverState *bs; BlockDriverState *target_bs; AioContext *aio_context; + AioContext *old_context; + int ret; =20 assert(common->action->type =3D=3D TRANSACTION_ACTION_KIND_BLOCKDEV_BA= CKUP); backup =3D common->action->u.blockdev_backup.data; @@ -1961,7 +1989,18 @@ static void blockdev_backup_prepare(BlkActionState *= common, Error **errp) return; } =20 + /* Honor bdrv_try_set_aio_context() context acquisition requirements. = */ aio_context =3D bdrv_get_aio_context(bs); + old_context =3D bdrv_get_aio_context(target_bs); + aio_context_acquire(old_context); + + ret =3D bdrv_try_set_aio_context(target_bs, aio_context, errp); + if (ret < 0) { + aio_context_release(old_context); + return; + } + + aio_context_release(old_context); aio_context_acquire(aio_context); state->bs =3D bs; =20 @@ -3562,7 +3601,6 @@ static BlockJob *do_backup_common(BackupCommon *backu= p, BlockJob *job =3D NULL; BdrvDirtyBitmap *bmap =3D NULL; int job_flags =3D JOB_DEFAULT; - int ret; =20 if (!backup->has_speed) { backup->speed =3D 0; @@ -3586,11 +3624,6 @@ static BlockJob *do_backup_common(BackupCommon *back= up, backup->compress =3D false; } =20 - ret =3D bdrv_try_set_aio_context(target_bs, aio_context, errp); - if (ret < 0) { - return NULL; - } - if ((backup->sync =3D=3D MIRROR_SYNC_MODE_BITMAP) || (backup->sync =3D=3D MIRROR_SYNC_MODE_INCREMENTAL)) { /* done before desugaring 'incremental' to print the right message= */ @@ -3825,6 +3858,7 @@ void qmp_drive_mirror(DriveMirror *arg, Error **errp) BlockDriverState *bs; BlockDriverState *source, *target_bs; AioContext *aio_context; + AioContext *old_context; BlockMirrorBackingMode backing_mode; Error *local_err =3D NULL; QDict *options =3D NULL; @@ -3937,10 +3971,19 @@ void qmp_drive_mirror(DriveMirror *arg, Error **err= p) (arg->mode =3D=3D NEW_IMAGE_MODE_EXISTING || !bdrv_has_zero_init(target_bs))); =20 + + /* Honor bdrv_try_set_aio_context() context acquisition requirements. = */ + old_context =3D bdrv_get_aio_context(target_bs); + aio_context_release(aio_context); + aio_context_acquire(old_context); + ret =3D bdrv_try_set_aio_context(target_bs, aio_context, errp); + + aio_context_release(old_context); + aio_context_acquire(aio_context); + if (ret < 0) { - bdrv_unref(target_bs); - goto out; + goto unref; } =20 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, targe= t_bs, @@ -3957,8 +4000,10 @@ void qmp_drive_mirror(DriveMirror *arg, Error **errp) arg->has_auto_finalize, arg->auto_finalize, arg->has_auto_dismiss, arg->auto_dismiss, &local_err); - bdrv_unref(target_bs); error_propagate(errp, local_err); + +unref: + bdrv_unref(target_bs); out: aio_context_release(aio_context); } @@ -3984,6 +4029,7 @@ void qmp_blockdev_mirror(bool has_job_id, const char = *job_id, BlockDriverState *bs; BlockDriverState *target_bs; AioContext *aio_context; + AioContext *old_context; BlockMirrorBackingMode backing_mode =3D MIRROR_LEAVE_BACKING_CHAIN; Error *local_err =3D NULL; bool zero_target; @@ -4001,10 +4047,16 @@ void qmp_blockdev_mirror(bool has_job_id, const cha= r *job_id, =20 zero_target =3D (sync =3D=3D MIRROR_SYNC_MODE_FULL); =20 + /* Honor bdrv_try_set_aio_context() context acquisition requirements. = */ + old_context =3D bdrv_get_aio_context(target_bs); aio_context =3D bdrv_get_aio_context(bs); - aio_context_acquire(aio_context); + aio_context_acquire(old_context); =20 ret =3D bdrv_try_set_aio_context(target_bs, aio_context, errp); + + aio_context_release(old_context); + aio_context_acquire(aio_context); + if (ret < 0) { goto out; } --=20 2.23.0