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GET /api/patches/815830/?format=api
{ "id": 815830, "url": "http://patchwork.ozlabs.org/api/patches/815830/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20170919201910.25656-6-eblake@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20170919201910.25656-6-eblake@redhat.com>", "list_archive_url": null, "date": "2017-09-19T20:18:55", "name": "[v9,05/20] dirty-bitmap: Avoid size query failure during truncate", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "f4eab3f91d43d331bf8a46a28a9e6873be129e37", "submitter": { "id": 6591, "url": "http://patchwork.ozlabs.org/api/people/6591/?format=api", "name": "Eric Blake", "email": "eblake@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20170919201910.25656-6-eblake@redhat.com/mbox/", "series": [ { "id": 3964, "url": "http://patchwork.ozlabs.org/api/series/3964/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=3964", "date": "2017-09-19T20:18:54", "name": "make dirty-bitmap byte-based", "version": 9, "mbox": "http://patchwork.ozlabs.org/series/3964/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/815830/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/815830/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org", "Authentication-Results": [ "ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=nongnu.org\n\t(client-ip=2001:4830:134:3::11; helo=lists.gnu.org;\n\tenvelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n\treceiver=<UNKNOWN>)", "ext-mx03.extmail.prod.ext.phx2.redhat.com;\n\tdmarc=none (p=none dis=none) header.from=redhat.com", "ext-mx03.extmail.prod.ext.phx2.redhat.com;\n\tspf=fail smtp.mailfrom=eblake@redhat.com" ], "Received": [ "from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11])\n\t(using TLSv1 with cipher AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xxZHg28gJz9s81\n\tfor <incoming@patchwork.ozlabs.org>;\n\tWed, 20 Sep 2017 06:30:07 +1000 (AEST)", "from localhost ([::1]:45253 helo=lists.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.71) (envelope-from\n\t<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>)\n\tid 1duP9h-0005kL-Bl\n\tfor incoming@patchwork.ozlabs.org; Tue, 19 Sep 2017 16:30:05 -0400", "from eggs.gnu.org ([2001:4830:134:3::10]:42331)\n\tby lists.gnu.org with esmtp (Exim 4.71)\n\t(envelope-from <eblake@redhat.com>) id 1duOzZ-0005KY-3T\n\tfor qemu-devel@nongnu.org; Tue, 19 Sep 2017 16:19:38 -0400", "from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)\n\t(envelope-from <eblake@redhat.com>) id 1duOzT-0004fr-Q0\n\tfor qemu-devel@nongnu.org; Tue, 19 Sep 2017 16:19:37 -0400", "from mx1.redhat.com ([209.132.183.28]:33650)\n\tby eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)\n\t(Exim 4.71) (envelope-from <eblake@redhat.com>)\n\tid 1duOzQ-0004cc-Im; Tue, 19 Sep 2017 16:19:28 -0400", "from smtp.corp.redhat.com\n\t(int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16])\n\t(using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby mx1.redhat.com (Postfix) with ESMTPS id A9EDF7E459;\n\tTue, 19 Sep 2017 20:19:27 +0000 (UTC)", "from red.redhat.com (ovpn-124-97.rdu2.redhat.com [10.10.124.97])\n\tby smtp.corp.redhat.com (Postfix) with ESMTP id 82FEA17545;\n\tTue, 19 Sep 2017 20:19:26 +0000 (UTC)" ], "DMARC-Filter": "OpenDMARC Filter v1.3.2 mx1.redhat.com A9EDF7E459", "From": "Eric Blake <eblake@redhat.com>", "To": "qemu-devel@nongnu.org", "Date": "Tue, 19 Sep 2017 15:18:55 -0500", "Message-Id": "<20170919201910.25656-6-eblake@redhat.com>", "In-Reply-To": "<20170919201910.25656-1-eblake@redhat.com>", "References": "<20170919201910.25656-1-eblake@redhat.com>", "X-Scanned-By": "MIMEDefang 2.79 on 10.5.11.16", "X-Greylist": "Sender IP whitelisted, not delayed by milter-greylist-4.5.16\n\t(mx1.redhat.com [10.5.110.27]);\n\tTue, 19 Sep 2017 20:19:27 +0000 (UTC)", "X-detected-operating-system": "by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic]\n\t[fuzzy]", "X-Received-From": "209.132.183.28", "Subject": "[Qemu-devel] [PATCH v9 05/20] dirty-bitmap: Avoid size query\n\tfailure during truncate", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.21", "Precedence": "list", "List-Id": "<qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n\t<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<http://lists.nongnu.org/archive/html/qemu-devel/>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n\t<mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Cc": "kwolf@redhat.com, vsementsov@virtuozzo.com, famz@redhat.com,\n\tqemu-block@nongnu.org, Max Reitz <mreitz@redhat.com>, jsnow@redhat.com", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "\"Qemu-devel\"\n\t<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>" }, "content": "We've previously fixed several places where we failed to account\nfor possible errors from bdrv_nb_sectors(). Fix another one by\nmaking bdrv_dirty_bitmap_truncate() take the new size from the\ncaller instead of querying itself; then adjust the sole caller\nbdrv_truncate() to pass the size just determined by a successful\nresize, or to skip the bitmap resize on failure, thus avoiding\nsizing the bitmaps to -1.\n\nSigned-off-by: Eric Blake <eblake@redhat.com>\n\n---\nv9: skip only bdrv_dirty_bitmap_truncate on error [Fam]\nv8: retitle and rework to avoid possibility of secondary failure [John]\nv7: new patch [Kevin]\n---\n include/block/dirty-bitmap.h | 2 +-\n block.c | 15 ++++++++++-----\n block/dirty-bitmap.c | 6 +++---\n 3 files changed, 14 insertions(+), 9 deletions(-)", "diff": "diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h\nindex 8fd842eac9..7a27590047 100644\n--- a/include/block/dirty-bitmap.h\n+++ b/include/block/dirty-bitmap.h\n@@ -83,7 +83,7 @@ int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter);\n void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *hbi, int64_t sector_num);\n int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap);\n int64_t bdrv_get_meta_dirty_count(BdrvDirtyBitmap *bitmap);\n-void bdrv_dirty_bitmap_truncate(BlockDriverState *bs);\n+void bdrv_dirty_bitmap_truncate(BlockDriverState *bs, int64_t bytes);\n bool bdrv_dirty_bitmap_readonly(const BdrvDirtyBitmap *bitmap);\n bool bdrv_has_readonly_bitmaps(BlockDriverState *bs);\n bool bdrv_dirty_bitmap_get_autoload(const BdrvDirtyBitmap *bitmap);\ndiff --git a/block.c b/block.c\nindex ee6a48976e..89261a7a53 100644\n--- a/block.c\n+++ b/block.c\n@@ -3450,12 +3450,17 @@ int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc,\n assert(!(bs->open_flags & BDRV_O_INACTIVE));\n\n ret = drv->bdrv_truncate(bs, offset, prealloc, errp);\n- if (ret == 0) {\n- ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);\n- bdrv_dirty_bitmap_truncate(bs);\n- bdrv_parent_cb_resize(bs);\n- atomic_inc(&bs->write_gen);\n+ if (ret < 0) {\n+ return ret;\n }\n+ ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);\n+ if (ret < 0) {\n+ error_setg_errno(errp, -ret, \"Could not refresh total sector count\");\n+ } else {\n+ bdrv_dirty_bitmap_truncate(bs, bs->total_sectors * BDRV_SECTOR_SIZE);\n+ }\n+ bdrv_parent_cb_resize(bs);\n+ atomic_inc(&bs->write_gen);\n return ret;\n }\n\ndiff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c\nindex 42a55e4a4b..ee164fb518 100644\n--- a/block/dirty-bitmap.c\n+++ b/block/dirty-bitmap.c\n@@ -1,7 +1,7 @@\n /*\n * Block Dirty Bitmap\n *\n- * Copyright (c) 2016 Red Hat. Inc\n+ * Copyright (c) 2016-2017 Red Hat. Inc\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to deal\n@@ -302,10 +302,10 @@ BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,\n * Truncates _all_ bitmaps attached to a BDS.\n * Called with BQL taken.\n */\n-void bdrv_dirty_bitmap_truncate(BlockDriverState *bs)\n+void bdrv_dirty_bitmap_truncate(BlockDriverState *bs, int64_t bytes)\n {\n BdrvDirtyBitmap *bitmap;\n- uint64_t size = bdrv_nb_sectors(bs);\n+ int64_t size = DIV_ROUND_UP(bytes, BDRV_SECTOR_SIZE);\n\n bdrv_dirty_bitmaps_lock(bs);\n QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {\n", "prefixes": [ "v9", "05/20" ] }