From nobody Mon Feb 9 04:48:16 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 1542386895996473.21600449446976; Fri, 16 Nov 2018 08:48:15 -0800 (PST) Received: from localhost ([::1]:45754 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gNhHy-0005RN-VQ for importer@patchew.org; Fri, 16 Nov 2018 11:48:15 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43492) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gNhFf-0004CJ-Tm for qemu-devel@nongnu.org; Fri, 16 Nov 2018 11:45:55 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gNhFW-0006MN-Lp for qemu-devel@nongnu.org; Fri, 16 Nov 2018 11:45:49 -0500 Received: from mx1.redhat.com ([209.132.183.28]:32922) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gNhFL-0006Fh-Jp; Fri, 16 Nov 2018 11:45:31 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DFCE8309E977; Fri, 16 Nov 2018 16:45:30 +0000 (UTC) Received: from localhost (unknown [10.40.206.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 61163611CC; Fri, 16 Nov 2018 16:45:30 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Date: Fri, 16 Nov 2018 17:45:24 +0100 Message-Id: <20181116164526.31487-2-mreitz@redhat.com> In-Reply-To: <20181116164526.31487-1-mreitz@redhat.com> References: <20181116164526.31487-1-mreitz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.49]); Fri, 16 Nov 2018 16:45:30 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH for-3.1? v2 1/3] block: Always abort reopen after prepare succeeded 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 , Fam Zheng , Alberto Garcia , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" bdrv_reopen_multiple() does not invoke bdrv_reopen_abort() for the element of the reopen queue for which bdrv_reopen_prepare() failed, because it assumes that the prepare function will have rolled back all changes already. However, bdrv_reopen_prepare() does not do this in every case: It may notice an error after BlockDriver.bdrv_reopen_prepare() succeeded, and it will not invoke BlockDriver.bdrv_reopen_abort() then; and neither will bdrv_reopen_multiple(), as explained above. This is wrong because we must always call .bdrv_reopen_commit() or .bdrv_reopen_abort() after .bdrv_reopen_prepare() has succeeded. Otherwise, the block driver has no chance to undo what it has done in its implementation of .bdrv_reopen_prepare(). To fix this, bdrv_reopen_prepare() has to call .bdrv_reopen_abort() if it wants to return an error after .bdrv_reopen_prepare() has succeeded. Signed-off-by: Max Reitz Reviewed-by: Alberto Garcia --- block.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/block.c b/block.c index fd67e14dfa..3feac08535 100644 --- a/block.c +++ b/block.c @@ -3201,6 +3201,7 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state= , BlockReopenQueue *queue, QDict *orig_reopen_opts; char *discard =3D NULL; bool read_only; + bool drv_prepared =3D false; =20 assert(reopen_state !=3D NULL); assert(reopen_state->bs->drv !=3D NULL); @@ -3285,6 +3286,8 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state= , BlockReopenQueue *queue, goto error; } =20 + drv_prepared =3D true; + /* Options that are not handled are only okay if they are unchanged * compared to the old state. It is expected that some options are only * used for the initial open, but not reopen (e.g. filename) */ @@ -3350,6 +3353,15 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_stat= e, BlockReopenQueue *queue, reopen_state->options =3D qobject_ref(orig_reopen_opts); =20 error: + if (ret < 0 && drv_prepared) { + /* drv->bdrv_reopen_prepare() has succeeded, so we need to + * call drv->bdrv_reopen_abort() before signaling an error + * (bdrv_reopen_multiple() will not call bdrv_reopen_abort() + * when the respective bdrv_reopen_prepare() has failed) */ + if (drv->bdrv_reopen_abort) { + drv->bdrv_reopen_abort(reopen_state); + } + } qemu_opts_del(opts); qobject_unref(orig_reopen_opts); g_free(discard); --=20 2.17.2 From nobody Mon Feb 9 04:48:16 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 1542387083768673.418210272628; Fri, 16 Nov 2018 08:51:23 -0800 (PST) Received: from localhost ([::1]:45773 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gNhL0-0008Mu-HW for importer@patchew.org; Fri, 16 Nov 2018 11:51:22 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43638) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gNhFp-0004KB-FE for qemu-devel@nongnu.org; Fri, 16 Nov 2018 11:46:05 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gNhFo-0006Vf-Nq for qemu-devel@nongnu.org; Fri, 16 Nov 2018 11:46:01 -0500 Received: from mx1.redhat.com ([209.132.183.28]:37758) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gNhFl-0006Rd-TE; Fri, 16 Nov 2018 11:45:57 -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 mx1.redhat.com (Postfix) with ESMTPS id 4465480508; Fri, 16 Nov 2018 16:45:54 +0000 (UTC) Received: from localhost (unknown [10.40.206.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C84C61019639; Fri, 16 Nov 2018 16:45:32 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Date: Fri, 16 Nov 2018 17:45:25 +0100 Message-Id: <20181116164526.31487-3-mreitz@redhat.com> In-Reply-To: <20181116164526.31487-1-mreitz@redhat.com> References: <20181116164526.31487-1-mreitz@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Fri, 16 Nov 2018 16:45:54 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH for-3.1? v2 2/3] file-posix: Fix shared locks on reopen commit 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 , Fam Zheng , Alberto Garcia , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" s->locked_shared_perm is the set of bits locked in the file, which is the inverse of the permissions actually shared. So we need to pass them as they are to raw_apply_lock_bytes() instead of inverting them again. Reported-by: Alberto Garcia Signed-off-by: Max Reitz Reviewed-by: Alberto Garcia --- block/file-posix.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/file-posix.c b/block/file-posix.c index df3a8d7cdf..8460d003f0 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -963,7 +963,7 @@ static void raw_reopen_commit(BDRVReopenState *state) =20 /* Copy locks to the new fd before closing the old one. */ raw_apply_lock_bytes(NULL, rs->fd, s->locked_perm, - ~s->locked_shared_perm, false, &local_err); + s->locked_shared_perm, false, &local_err); if (local_err) { /* shouldn't fail in a sane host, but report it just in case. */ error_report_err(local_err); --=20 2.17.2 From nobody Mon Feb 9 04:48:16 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 154238698986261.64904820114384; Fri, 16 Nov 2018 08:49:49 -0800 (PST) Received: from localhost ([::1]:45760 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gNhJU-00079f-I8 for importer@patchew.org; Fri, 16 Nov 2018 11:49:48 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43644) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gNhFp-0004LD-S6 for qemu-devel@nongnu.org; Fri, 16 Nov 2018 11:46:05 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gNhFo-0006Vq-Tm for qemu-devel@nongnu.org; Fri, 16 Nov 2018 11:46:01 -0500 Received: from mx1.redhat.com ([209.132.183.28]:50368) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gNhFl-0006TG-Un; Fri, 16 Nov 2018 11:45:58 -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 mx1.redhat.com (Postfix) with ESMTPS id 1C1563091D5D; Fri, 16 Nov 2018 16:45:57 +0000 (UTC) Received: from localhost (unknown [10.40.206.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 16A03101962E; Fri, 16 Nov 2018 16:45:55 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Date: Fri, 16 Nov 2018 17:45:26 +0100 Message-Id: <20181116164526.31487-4-mreitz@redhat.com> In-Reply-To: <20181116164526.31487-1-mreitz@redhat.com> References: <20181116164526.31487-1-mreitz@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Fri, 16 Nov 2018 16:45:57 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH for-3.1? v2 3/3] iotests: Test file-posix locking and reopen 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 , Fam Zheng , Alberto Garcia , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: Max Reitz Reviewed-by: Alberto Garcia --- tests/qemu-iotests/182 | 71 ++++++++++++++++++++++++++++++++++++++ tests/qemu-iotests/182.out | 9 +++++ 2 files changed, 80 insertions(+) diff --git a/tests/qemu-iotests/182 b/tests/qemu-iotests/182 index 4b31592fb8..3b7689c1d5 100755 --- a/tests/qemu-iotests/182 +++ b/tests/qemu-iotests/182 @@ -31,6 +31,7 @@ status=3D1 # failure is the default! _cleanup() { _cleanup_test_img + rm -f "$TEST_IMG.overlay" } trap "_cleanup; exit \$status" 0 1 2 3 15 =20 @@ -71,6 +72,76 @@ echo 'quit' | $QEMU -nographic -monitor stdio \ =20 _cleanup_qemu =20 +echo +echo '=3D=3D=3D Testing reopen =3D=3D=3D' +echo + +# This tests that reopening does not unshare any permissions it should +# not unshare +# (There was a bug where reopening shared exactly the opposite of the +# permissions it was supposed to share) + +_launch_qemu + +_send_qemu_cmd $QEMU_HANDLE \ + "{'execute': 'qmp_capabilities'}" \ + 'return' + +# Open the image without any format layer (we are not going to access +# it, so that is fine) +# This should keep all permissions shared. +success_or_failure=3Dy _send_qemu_cmd $QEMU_HANDLE \ + "{'execute': 'blockdev-add', + 'arguments': { + 'node-name': 'node0', + 'driver': 'file', + 'filename': '$TEST_IMG', + 'locking': 'on' + } }" \ + 'return' \ + 'error' + +# This snapshot will perform a reopen to drop R/W to RO. +# It should still keep all permissions shared. +success_or_failure=3Dy _send_qemu_cmd $QEMU_HANDLE \ + "{'execute': 'blockdev-snapshot-sync', + 'arguments': { + 'node-name': 'node0', + 'snapshot-file': '$TEST_IMG.overlay', + 'snapshot-node-name': 'node1' + } }" \ + 'return' \ + 'error' + +# Now open the same file again +# This does not require any permissions (and does not unshare any), so +# this will not conflict with node0. +success_or_failure=3Dy _send_qemu_cmd $QEMU_HANDLE \ + "{'execute': 'blockdev-add', + 'arguments': { + 'node-name': 'node1', + 'driver': 'file', + 'filename': '$TEST_IMG', + 'locking': 'on' + } }" \ + 'return' \ + 'error' + +# Now we attach the image to a virtio-blk device. This device does +# require some permissions (at least WRITE and READ_CONSISTENT), so if +# reopening node0 unshared any (which it should not have), this will +# fail (but it should not). +success_or_failure=3Dy _send_qemu_cmd $QEMU_HANDLE \ + "{'execute': 'device_add', + 'arguments': { + 'driver': 'virtio-blk', + 'drive': 'node1' + } }" \ + 'return' \ + 'error' + +_cleanup_qemu + # success, all done echo "*** done" rm -f $seq.full diff --git a/tests/qemu-iotests/182.out b/tests/qemu-iotests/182.out index f1463c8862..af501ca3f3 100644 --- a/tests/qemu-iotests/182.out +++ b/tests/qemu-iotests/182.out @@ -5,4 +5,13 @@ Starting QEMU Starting a second QEMU using the same image should fail QEMU_PROG: -drive file=3DTEST_DIR/t.qcow2,if=3Dnone,id=3Ddrive0,file.locki= ng=3Don: Failed to get "write" lock Is another process using the image [TEST_DIR/t.qcow2]? + +=3D=3D=3D Testing reopen =3D=3D=3D + +{"return": {}} +{"return": {}} +Formatting 'TEST_DIR/t.qcow2.overlay', fmt=3Dqcow2 size=3D197120 backing_f= ile=3DTEST_DIR/t.qcow2 backing_fmt=3Dfile cluster_size=3D65536 lazy_refcoun= ts=3Doff refcount_bits=3D16 +{"return": {}} +{"return": {}} +{"return": {}} *** done --=20 2.17.2