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bh=sLtShjaBLZarYjMFYpOtzf8DGl/cdiY036TpaXA36N0=; b=Zu323QG28iUGsZ6XUU+OLiKU0tAxjUJdBAPlKsBgwRQbWIkOSl0ZZrYkhYt8ryzBJFZ5Rh BmEhlomEzL9DUxwNOjlwYzYDjLiXQnH1ygDpHG6THXZ0j1Azp2Ft0stMUdkakk+bJp/1lP npZTxXZulRqZNqCIxAUqh48Yg6zMwro= X-MC-Unique: bxdB9b8aOE69Ng3v53KQZg-1 From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH v7 16/47] block: Use bdrv_cow_child() in bdrv_co_truncate() Date: Thu, 25 Jun 2020 17:21:44 +0200 Message-Id: <20200625152215.941773-17-mreitz@redhat.com> In-Reply-To: <20200625152215.941773-1-mreitz@redhat.com> References: <20200625152215.941773-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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=207.211.31.81; envelope-from=mreitz@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/25 02:30:11 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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 , Vladimir Sementsov-Ogievskiy , qemu-devel@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" The condition modified here is not about potentially filtered children, but only about COW sources (i.e. traditional backing files). Signed-off-by: Max Reitz Reviewed-by: Andrey Shinkevich --- block/io.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/block/io.c b/block/io.c index dc9891d6ce..097a3861d8 100644 --- a/block/io.c +++ b/block/io.c @@ -3308,7 +3308,7 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, i= nt64_t offset, bool exact, Error **errp) { BlockDriverState *bs =3D child->bs; - BdrvChild *filtered; + BdrvChild *filtered, *backing; BlockDriver *drv =3D bs->drv; BdrvTrackedRequest req; int64_t old_size, new_bytes; @@ -3361,6 +3361,7 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, i= nt64_t offset, bool exact, } =20 filtered =3D bdrv_filter_child(bs); + backing =3D bdrv_cow_child(bs); =20 /* * If the image has a backing file that is large enough that it would @@ -3372,10 +3373,10 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child,= int64_t offset, bool exact, * backing file, taking care of keeping things consistent with that ba= cking * file is the user's responsibility. */ - if (new_bytes && bs->backing) { + if (new_bytes && backing) { int64_t backing_len; =20 - backing_len =3D bdrv_getlength(backing_bs(bs)); + backing_len =3D bdrv_getlength(backing->bs); if (backing_len < 0) { ret =3D backing_len; error_setg_errno(errp, -ret, "Could not get backing file size"= ); --=20 2.26.2