From nobody Mon Feb 9 19:05:41 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1531204812691713.3815740436472; Mon, 9 Jul 2018 23:40:12 -0700 (PDT) Received: from localhost ([::1]:46092 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fcmJh-0007oZ-JE for importer@patchew.org; Tue, 10 Jul 2018 02:40:05 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50329) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fcmCQ-0001vh-Qb for qemu-devel@nongnu.org; Tue, 10 Jul 2018 02:32:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fcmCQ-0007vH-09 for qemu-devel@nongnu.org; Tue, 10 Jul 2018 02:32:34 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:47578 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 1fcmCN-0007ue-Gk; Tue, 10 Jul 2018 02:32:31 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1B695402315B; Tue, 10 Jul 2018 06:32:31 +0000 (UTC) Received: from lemon.usersys.redhat.com (ovpn-12-114.pek2.redhat.com [10.72.12.114]) by smtp.corp.redhat.com (Postfix) with ESMTP id E21EC16873; Tue, 10 Jul 2018 06:32:25 +0000 (UTC) From: Fam Zheng To: qemu-devel@nongnu.org Date: Tue, 10 Jul 2018 14:31:21 +0800 Message-Id: <20180710063124.2263-8-famz@redhat.com> In-Reply-To: <20180710063124.2263-1-famz@redhat.com> References: <20180710063124.2263-1-famz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Tue, 10 Jul 2018 06:32:31 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Tue, 10 Jul 2018 06:32:31 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'famz@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 07/10] block: Use common req handling for discard 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: Kevin Wolf , vsementsov@virtuozzo.com, Fam Zheng , qemu-block@nongnu.org, John Snow , Jeff Cody , Max Reitz , Stefan Hajnoczi , Paolo Bonzini Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Reuse the new bdrv_co_write_req_prepare/finish helpers. The variation here is that discard requests don't affect bs->wr_highest_offset, and it cannot extend the image. Signed-off-by: Fam Zheng --- block/io.c | 32 ++++++++++++++++++++++---------- 1 file changed, 22 insertions(+), 10 deletions(-) diff --git a/block/io.c b/block/io.c index 10a475302a..cc426bab2e 100644 --- a/block/io.c +++ b/block/io.c @@ -1601,15 +1601,31 @@ bdrv_co_write_req_finish(BdrvChild *child, int64_t = offset, uint64_t bytes, =20 atomic_inc(&bs->write_gen); =20 - stat64_max(&bs->wr_highest_offset, offset + bytes); - + /* Discard cannot extend the image, but in error handling cases, such = as + * when reverting a qcow2 cluster allocation, the discarded range can = pass + * the end of image file, so we cannot assert about BDRV_TRACKED_DISCA= RD + * here. Instead, just skip it, since semantically a discard request + * beyond EOF cannot expand the image anyway. + * */ if (ret =3D=3D 0 && - end_sector > bs->total_sectors) { + end_sector > bs->total_sectors && + req->type !=3D BDRV_TRACKED_DISCARD) { bs->total_sectors =3D end_sector; bdrv_parent_cb_resize(bs); bdrv_dirty_bitmap_truncate(bs, end_sector << BDRV_SECTOR_BITS); } - bdrv_set_dirty(bs, offset, bytes); + if (req->bytes) { + switch (req->type) { + case BDRV_TRACKED_WRITE: + stat64_max(&bs->wr_highest_offset, offset + bytes); + /* fall through, to set dirty bits */ + case BDRV_TRACKED_DISCARD: + bdrv_set_dirty(bs, offset, bytes); + break; + default: + break; + } + } } =20 /* @@ -2670,10 +2686,7 @@ int coroutine_fn bdrv_co_pdiscard(BdrvChild *child, = int64_t offset, int bytes) ret =3D bdrv_check_byte_request(bs, offset, bytes); if (ret < 0) { return ret; - } else if (bs->read_only) { - return -EPERM; } - assert(!(bs->open_flags & BDRV_O_INACTIVE)); =20 /* Do nothing if disabled. */ if (!(bs->open_flags & BDRV_O_UNMAP)) { @@ -2697,7 +2710,7 @@ int coroutine_fn bdrv_co_pdiscard(BdrvChild *child, i= nt64_t offset, int bytes) bdrv_inc_in_flight(bs); tracked_request_begin(&req, bs, offset, bytes, BDRV_TRACKED_DISCARD); =20 - ret =3D notifier_with_return_list_notify(&bs->before_write_notifiers, = &req); + ret =3D bdrv_co_write_req_prepare(child, offset, bytes, &req, 0); if (ret < 0) { goto out; } @@ -2763,8 +2776,7 @@ int coroutine_fn bdrv_co_pdiscard(BdrvChild *child, i= nt64_t offset, int bytes) } ret =3D 0; out: - atomic_inc(&bs->write_gen); - bdrv_set_dirty(bs, req.offset, req.bytes); + bdrv_co_write_req_finish(child, req.offset, req.bytes, &req, ret); tracked_request_end(&req); bdrv_dec_in_flight(bs); return ret; --=20 2.17.1