From patchwork Thu Nov 26 17:35:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= X-Patchwork-Id: 1406779 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=XwGfcMie; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4ChlLT723Gz9sTR for ; Fri, 27 Nov 2020 04:36:49 +1100 (AEDT) Received: from localhost ([::1]:57390 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kiLCJ-0002ji-Ty for incoming@patchwork.ozlabs.org; Thu, 26 Nov 2020 12:36:47 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:38076) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kiLBE-0002Mv-3c for qemu-devel@nongnu.org; Thu, 26 Nov 2020 12:35:40 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:35687) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kiLBB-0006L5-Tm for qemu-devel@nongnu.org; Thu, 26 Nov 2020 12:35:39 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1606412137; 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=BloueFa7D/SXIJNfJdjMTUEXSjsISpX8A38tX1by3CE=; b=XwGfcMiezga4Uqq5jqzXWjkTJsGxRCcHcsu01uI266/VJY8vPfUhe0M+p2tEoiIYbHBWna tyu7/a/6leVRtXFWMkD6JlUFy1YqiSU5vIBvBtT4V/N6PbEIS5tyIp6Wt5rmzRhz0ek+Ww 3HqdPQ5Nb3K+Bw5ZFafa56jy2ThxSdo= 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-561-azhRjKxMPeWz3kFcBW7lmw-1; Thu, 26 Nov 2020 12:35:33 -0500 X-MC-Unique: azhRjKxMPeWz3kFcBW7lmw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B185D8145E1; Thu, 26 Nov 2020 17:35:31 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.36.110.2]) by smtp.corp.redhat.com (Postfix) with ESMTP id 95E011F047; Thu, 26 Nov 2020 17:35:27 +0000 (UTC) From: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH v8 01/11] block: push error reporting into bdrv_all_*_snapshot functions Date: Thu, 26 Nov 2020 17:35:11 +0000 Message-Id: <20201126173521.137580-2-berrange@redhat.com> In-Reply-To: <20201126173521.137580-1-berrange@redhat.com> References: <20201126173521.137580-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no 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 , Peter Krempa , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , "Denis V. Lunev" , qemu-block@nongnu.org, Juan Quintela , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , "Dr. David Alan Gilbert" , Max Reitz , Pavel Dovgalyuk , Paolo Bonzini , John Snow , Markus Armbruster Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The bdrv_all_*_snapshot functions return a BlockDriverState pointer for the invalid backend, which the callers then use to report an error message. In some cases multiple callers are reporting the same error message, but with slightly different text. In the future there will be more error scenarios for some of these methods, which will benefit from fine grained error message reporting. So it is helpful to push error reporting down a level. Signed-off-by: Daniel P. Berrangé [PMD: Initialize variables] Signed-off-by: Philippe Mathieu-Daudé --- block/monitor/block-hmp-cmds.c | 7 ++-- block/snapshot.c | 77 +++++++++++++++++----------------- include/block/snapshot.h | 14 +++---- migration/savevm.c | 37 +++++----------- monitor/hmp-cmds.c | 7 +--- replay/replay-debugging.c | 4 +- tests/qemu-iotests/267.out | 10 ++--- 7 files changed, 67 insertions(+), 89 deletions(-) diff --git a/block/monitor/block-hmp-cmds.c b/block/monitor/block-hmp-cmds.c index d15a2be827..548bb6b5e3 100644 --- a/block/monitor/block-hmp-cmds.c +++ b/block/monitor/block-hmp-cmds.c @@ -899,10 +899,11 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict) ImageEntry *image_entry, *next_ie; SnapshotEntry *snapshot_entry; + Error *err = NULL; - bs = bdrv_all_find_vmstate_bs(); + bs = bdrv_all_find_vmstate_bs(&err); if (!bs) { - monitor_printf(mon, "No available block device supports snapshots\n"); + error_report_err(err); return; } aio_context = bdrv_get_aio_context(bs); @@ -952,7 +953,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict) total = 0; for (i = 0; i < nb_sns; i++) { SnapshotEntry *next_sn; - if (bdrv_all_find_snapshot(sn_tab[i].name, &bs1) == 0) { + if (bdrv_all_find_snapshot(sn_tab[i].name, NULL) == 0) { global_snapshots[total] = i; total++; QTAILQ_FOREACH(image_entry, &image_list, next) { diff --git a/block/snapshot.c b/block/snapshot.c index a2bf3a54eb..482e3fc7b7 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -462,14 +462,14 @@ static bool bdrv_all_snapshots_includes_bs(BlockDriverState *bs) * These functions will properly handle dataplane (take aio_context_acquire * when appropriate for appropriate block drivers) */ -bool bdrv_all_can_snapshot(BlockDriverState **first_bad_bs) +bool bdrv_all_can_snapshot(Error **errp) { - bool ok = true; BlockDriverState *bs; BdrvNextIterator it; for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { AioContext *ctx = bdrv_get_aio_context(bs); + bool ok = true; aio_context_acquire(ctx); if (bdrv_all_snapshots_includes_bs(bs)) { @@ -477,26 +477,25 @@ bool bdrv_all_can_snapshot(BlockDriverState **first_bad_bs) } aio_context_release(ctx); if (!ok) { + error_setg(errp, "Device '%s' is writable but does not support " + "snapshots", bdrv_get_device_or_node_name(bs)); bdrv_next_cleanup(&it); - goto fail; + return false; } } -fail: - *first_bad_bs = bs; - return ok; + return true; } -int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bad_bs, - Error **errp) +int bdrv_all_delete_snapshot(const char *name, Error **errp) { - int ret = 0; BlockDriverState *bs; BdrvNextIterator it; QEMUSnapshotInfo sn1, *snapshot = &sn1; for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { AioContext *ctx = bdrv_get_aio_context(bs); + int ret = 0; aio_context_acquire(ctx); if (bdrv_all_snapshots_includes_bs(bs) && @@ -507,26 +506,25 @@ int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bad_bs, } aio_context_release(ctx); if (ret < 0) { + error_prepend(errp, "Could not delete snapshot '%s' on '%s': ", + name, bdrv_get_device_or_node_name(bs)); bdrv_next_cleanup(&it); - goto fail; + return -1; } } -fail: - *first_bad_bs = bs; - return ret; + return 0; } -int bdrv_all_goto_snapshot(const char *name, BlockDriverState **first_bad_bs, - Error **errp) +int bdrv_all_goto_snapshot(const char *name, Error **errp) { - int ret = 0; BlockDriverState *bs; BdrvNextIterator it; for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { AioContext *ctx = bdrv_get_aio_context(bs); + int ret = 0; aio_context_acquire(ctx); if (bdrv_all_snapshots_includes_bs(bs)) { @@ -534,75 +532,75 @@ int bdrv_all_goto_snapshot(const char *name, BlockDriverState **first_bad_bs, } aio_context_release(ctx); if (ret < 0) { + error_prepend(errp, "Could not load snapshot '%s' on '%s': ", + name, bdrv_get_device_or_node_name(bs)); bdrv_next_cleanup(&it); - goto fail; + return -1; } } -fail: - *first_bad_bs = bs; - return ret; + return 0; } -int bdrv_all_find_snapshot(const char *name, BlockDriverState **first_bad_bs) +int bdrv_all_find_snapshot(const char *name, Error **errp) { QEMUSnapshotInfo sn; - int err = 0; BlockDriverState *bs; BdrvNextIterator it; for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { AioContext *ctx = bdrv_get_aio_context(bs); + int ret = 0; aio_context_acquire(ctx); if (bdrv_all_snapshots_includes_bs(bs)) { - err = bdrv_snapshot_find(bs, &sn, name); + ret = bdrv_snapshot_find(bs, &sn, name); } aio_context_release(ctx); - if (err < 0) { + if (ret < 0) { + error_setg(errp, "Could not find snapshot '%s' on '%s'", + name, bdrv_get_device_or_node_name(bs)); bdrv_next_cleanup(&it); - goto fail; + return -1; } } -fail: - *first_bad_bs = bs; - return err; + return 0; } int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, BlockDriverState *vm_state_bs, uint64_t vm_state_size, - BlockDriverState **first_bad_bs) + Error **errp) { - int err = 0; BlockDriverState *bs; BdrvNextIterator it; for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { AioContext *ctx = bdrv_get_aio_context(bs); + int ret = 0; aio_context_acquire(ctx); if (bs == vm_state_bs) { sn->vm_state_size = vm_state_size; - err = bdrv_snapshot_create(bs, sn); + ret = bdrv_snapshot_create(bs, sn); } else if (bdrv_all_snapshots_includes_bs(bs)) { sn->vm_state_size = 0; - err = bdrv_snapshot_create(bs, sn); + ret = bdrv_snapshot_create(bs, sn); } aio_context_release(ctx); - if (err < 0) { + if (ret < 0) { + error_setg(errp, "Could not create snapshot '%s' on '%s'", + sn->name, bdrv_get_device_or_node_name(bs)); bdrv_next_cleanup(&it); - goto fail; + return -1; } } -fail: - *first_bad_bs = bs; - return err; + return 0; } -BlockDriverState *bdrv_all_find_vmstate_bs(void) +BlockDriverState *bdrv_all_find_vmstate_bs(Error **errp) { BlockDriverState *bs; BdrvNextIterator it; @@ -620,5 +618,8 @@ BlockDriverState *bdrv_all_find_vmstate_bs(void) break; } } + if (!bs) { + error_setg(errp, "No block device supports snapshots"); + } return bs; } diff --git a/include/block/snapshot.h b/include/block/snapshot.h index b0fe42993d..5cb2b696ad 100644 --- a/include/block/snapshot.h +++ b/include/block/snapshot.h @@ -77,17 +77,15 @@ int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, * These functions will properly handle dataplane (take aio_context_acquire * when appropriate for appropriate block drivers */ -bool bdrv_all_can_snapshot(BlockDriverState **first_bad_bs); -int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bsd_bs, - Error **errp); -int bdrv_all_goto_snapshot(const char *name, BlockDriverState **first_bad_bs, - Error **errp); -int bdrv_all_find_snapshot(const char *name, BlockDriverState **first_bad_bs); +bool bdrv_all_can_snapshot(Error **errp); +int bdrv_all_delete_snapshot(const char *name, Error **errp); +int bdrv_all_goto_snapshot(const char *name, Error **errp); +int bdrv_all_find_snapshot(const char *name, Error **errp); int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, BlockDriverState *vm_state_bs, uint64_t vm_state_size, - BlockDriverState **first_bad_bs); + Error **errp); -BlockDriverState *bdrv_all_find_vmstate_bs(void); +BlockDriverState *bdrv_all_find_vmstate_bs(Error **errp); #endif diff --git a/migration/savevm.c b/migration/savevm.c index 5f937a2762..221b85e07c 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2727,7 +2727,7 @@ int qemu_load_device_state(QEMUFile *f) int save_snapshot(const char *name, Error **errp) { - BlockDriverState *bs, *bs1; + BlockDriverState *bs; QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1; int ret = -1, ret2; QEMUFile *f; @@ -2747,25 +2747,19 @@ int save_snapshot(const char *name, Error **errp) return ret; } - if (!bdrv_all_can_snapshot(&bs)) { - error_setg(errp, "Device '%s' is writable but does not support " - "snapshots", bdrv_get_device_or_node_name(bs)); + if (!bdrv_all_can_snapshot(errp)) { return ret; } /* Delete old snapshots of the same name */ if (name) { - ret = bdrv_all_delete_snapshot(name, &bs1, errp); - if (ret < 0) { - error_prepend(errp, "Error while deleting snapshot on device " - "'%s': ", bdrv_get_device_or_node_name(bs1)); + if (bdrv_all_delete_snapshot(name, errp) < 0) { return ret; } } - bs = bdrv_all_find_vmstate_bs(); + bs = bdrv_all_find_vmstate_bs(errp); if (bs == NULL) { - error_setg(errp, "No block device can accept snapshots"); return ret; } aio_context = bdrv_get_aio_context(bs); @@ -2835,10 +2829,8 @@ int save_snapshot(const char *name, Error **errp) aio_context_release(aio_context); aio_context = NULL; - ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, &bs); + ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, errp); if (ret < 0) { - error_setg(errp, "Error while creating snapshot on '%s'", - bdrv_get_device_or_node_name(bs)); goto the_end; } @@ -2941,30 +2933,23 @@ void qmp_xen_load_devices_state(const char *filename, Error **errp) int load_snapshot(const char *name, Error **errp) { - BlockDriverState *bs, *bs_vm_state; + BlockDriverState *bs_vm_state; QEMUSnapshotInfo sn; QEMUFile *f; int ret; AioContext *aio_context; MigrationIncomingState *mis = migration_incoming_get_current(); - if (!bdrv_all_can_snapshot(&bs)) { - error_setg(errp, - "Device '%s' is writable but does not support snapshots", - bdrv_get_device_or_node_name(bs)); + if (!bdrv_all_can_snapshot(errp)) { return -ENOTSUP; } - ret = bdrv_all_find_snapshot(name, &bs); + ret = bdrv_all_find_snapshot(name, errp); if (ret < 0) { - error_setg(errp, - "Device '%s' does not have the requested snapshot '%s'", - bdrv_get_device_or_node_name(bs), name); return ret; } - bs_vm_state = bdrv_all_find_vmstate_bs(); + bs_vm_state = bdrv_all_find_vmstate_bs(errp); if (!bs_vm_state) { - error_setg(errp, "No block device supports snapshots"); return -ENOTSUP; } aio_context = bdrv_get_aio_context(bs_vm_state); @@ -2990,10 +2975,8 @@ int load_snapshot(const char *name, Error **errp) /* Flush all IO requests so they don't interfere with the new state. */ bdrv_drain_all_begin(); - ret = bdrv_all_goto_snapshot(name, &bs, errp); + ret = bdrv_all_goto_snapshot(name, errp); if (ret < 0) { - error_prepend(errp, "Could not load snapshot '%s' on '%s': ", - name, bdrv_get_device_or_node_name(bs)); goto err_drain; } diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c index 65d8ff4849..e41e12347c 100644 --- a/monitor/hmp-cmds.c +++ b/monitor/hmp-cmds.c @@ -1146,15 +1146,10 @@ void hmp_savevm(Monitor *mon, const QDict *qdict) void hmp_delvm(Monitor *mon, const QDict *qdict) { - BlockDriverState *bs; Error *err = NULL; const char *name = qdict_get_str(qdict, "name"); - if (bdrv_all_delete_snapshot(name, &bs, &err) < 0) { - error_prepend(&err, - "deleting snapshot on device '%s': ", - bdrv_get_device_name(bs)); - } + bdrv_all_delete_snapshot(name, &err); hmp_handle_error(mon, err); } diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c index 1d6a968406..7ad0a37179 100644 --- a/replay/replay-debugging.c +++ b/replay/replay-debugging.c @@ -149,7 +149,7 @@ static char *replay_find_nearest_snapshot(int64_t icount, *snapshot_icount = -1; - bs = bdrv_all_find_vmstate_bs(); + bs = bdrv_all_find_vmstate_bs(NULL); if (!bs) { goto fail; } @@ -160,7 +160,7 @@ static char *replay_find_nearest_snapshot(int64_t icount, aio_context_release(aio_context); for (i = 0; i < nb_sns; i++) { - if (bdrv_all_find_snapshot(sn_tab[i].name, &bs) == 0) { + if (bdrv_all_find_snapshot(sn_tab[i].name, NULL) == 0) { if (sn_tab[i].icount != -1ULL && sn_tab[i].icount <= icount && (!nearest || nearest->icount < sn_tab[i].icount)) { diff --git a/tests/qemu-iotests/267.out b/tests/qemu-iotests/267.out index 27471ffae8..6149029b25 100644 --- a/tests/qemu-iotests/267.out +++ b/tests/qemu-iotests/267.out @@ -6,9 +6,9 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 Testing: QEMU X.Y.Z monitor - type 'help' for more information (qemu) savevm snap0 -Error: No block device can accept snapshots +Error: No block device supports snapshots (qemu) info snapshots -No available block device supports snapshots +No block device supports snapshots (qemu) loadvm snap0 Error: No block device supports snapshots (qemu) quit @@ -22,7 +22,7 @@ QEMU X.Y.Z monitor - type 'help' for more information (qemu) savevm snap0 Error: Device 'none0' is writable but does not support snapshots (qemu) info snapshots -No available block device supports snapshots +No block device supports snapshots (qemu) loadvm snap0 Error: Device 'none0' is writable but does not support snapshots (qemu) quit @@ -58,7 +58,7 @@ QEMU X.Y.Z monitor - type 'help' for more information (qemu) savevm snap0 Error: Device 'virtio0' is writable but does not support snapshots (qemu) info snapshots -No available block device supports snapshots +No block device supports snapshots (qemu) loadvm snap0 Error: Device 'virtio0' is writable but does not support snapshots (qemu) quit @@ -83,7 +83,7 @@ QEMU X.Y.Z monitor - type 'help' for more information (qemu) savevm snap0 Error: Device 'file' is writable but does not support snapshots (qemu) info snapshots -No available block device supports snapshots +No block device supports snapshots (qemu) loadvm snap0 Error: Device 'file' is writable but does not support snapshots (qemu) quit