From nobody Mon Feb 9 23:01:56 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=virtuozzo.com ARC-Seal: i=1; a=rsa-sha256; t=1554821878; cv=none; d=zoho.com; s=zohoarc; b=PN+zsLh68nC8ckoLJOtfn30jFr/Pb31oiwyXm3i5GKcq3H4YMNxZ8ze72lZjohTyHbqXsYJpokEXOzXEmAjajff5nJtM4SXrg0qfLHBYnPb7WYJBZW3YrH1CI3cOI9tRiRdqC68zXJF2izexs9anG98ohzX8R8ZN/KSiOtIN7Vc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1554821878; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=MQ8USoYfwlfpqaDDawjEY3UNtjxj9QRQ6hLl1HrnSFI=; b=XWZndyQH8hOwINHm1D4ldMrihWBUAKzEJ13xizQl4pAmo0I6cLDjUB+fBsgvQeMBicOTGs1fdoK5+jxHYGDUTNwE4C7EIHCrsF88N0hmziyivh9e0e1EHIc1A/G7utJ77v8HeFb8zINpEL2BBhrIvMbnuQj+B2g5T5eVpHzN8oc= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1554821877651316.64882898303495; Tue, 9 Apr 2019 07:57:57 -0700 (PDT) Received: from localhost ([127.0.0.1]:42851 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hDsCA-0002aZ-Kd for importer@patchew.org; Tue, 09 Apr 2019 10:57:54 -0400 Received: from eggs.gnu.org ([209.51.188.92]:53327) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hDsAv-0001us-Tg for qemu-devel@nongnu.org; Tue, 09 Apr 2019 10:56:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hDsAu-0006mN-NM for qemu-devel@nongnu.org; Tue, 09 Apr 2019 10:56:37 -0400 Received: from relay.sw.ru ([185.231.240.75]:39716) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hDsAu-0006lJ-BP; Tue, 09 Apr 2019 10:56:36 -0400 Received: from [172.16.25.136] (helo=localhost.sw.ru) by relay.sw.ru with esmtp (Exim 4.91) (envelope-from ) id 1hDsAr-0007rL-4N; Tue, 09 Apr 2019 17:56:33 +0300 From: Andrey Shinkevich To: qemu-devel@nongnu.org, qemu-block@nongnu.org Date: Tue, 9 Apr 2019 17:56:31 +0300 Message-Id: <1554821792-968307-2-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1554821792-968307-1-git-send-email-andrey.shinkevich@virtuozzo.com> References: <1554821792-968307-1-git-send-email-andrey.shinkevich@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH 1/2] qemu-img convert: ignore read errors 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: kwolf@redhat.com, den@openvz.org, vsementsov@virtuozzo.com, andrey.shinkevich@virtuozzo.com, mreitz@redhat.com 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" The 'qemu-img convert' new command option 'force read' with the key '-R' allows converting a damaged image to get all the available information in case of the read errors. The program reports read errors and continue the image conversion. The users should keep in their minds that the resulting image is inconsistent. Suggested-by: Denis V. Lunev Signed-off-by: Andrey Shinkevich Reviewed-by: Vladimir Sementsov-Ogievskiy --- qemu-img-cmds.hx | 4 ++-- qemu-img.c | 18 ++++++++++++++++-- qemu-img.texi | 2 +- 3 files changed, 19 insertions(+), 5 deletions(-) diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx index 1526f32..09af9cb 100644 --- a/qemu-img-cmds.hx +++ b/qemu-img-cmds.hx @@ -44,9 +44,9 @@ STEXI ETEXI =20 DEF("convert", img_convert, - "convert [--object objectdef] [--image-opts] [--target-image-opts] [-U= ] [-C] [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-T src_cache] [-O output_fm= t] [-B backing_file] [-o options] [-l snapshot_param] [-S sparse_size] [-m = num_coroutines] [-W] filename [filename2 [...]] output_filename") + "convert [--object objectdef] [--image-opts] [--target-image-opts] [-U= ] [-R] [-C] [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-T src_cache] [-O outp= ut_fmt] [-B backing_file] [-o options] [-l snapshot_param] [-S sparse_size]= [-m num_coroutines] [-W] filename [filename2 [...]] output_filename") STEXI -@item convert [--object @var{objectdef}] [--image-opts] [--target-image-op= ts] [-U] [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{src_c= ache}] [-O @var{output_fmt}] [-B @var{backing_file}] [-o @var{options}] [-l= @var{snapshot_param}] [-S @var{sparse_size}] [-m @var{num_coroutines}] [-W= ] @var{filename} [@var{filename2} [...]] @var{output_filename} +@item convert [--object @var{objectdef}] [--image-opts] [--target-image-op= ts] [-U] [-R] [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{= src_cache}] [-O @var{output_fmt}] [-B @var{backing_file}] [-o @var{options}= ] [-l @var{snapshot_param}] [-S @var{sparse_size}] [-m @var{num_coroutines}= ] [-W] @var{filename} [@var{filename2} [...]] @var{output_filename} ETEXI =20 DEF("create", img_create, diff --git a/qemu-img.c b/qemu-img.c index aa6f81f..494e880 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -175,6 +175,7 @@ static void QEMU_NORETURN help(void) "Parameters to convert subcommand:\n" " '-m' specifies how many coroutines work in parallel during t= he convert\n" " process (defaults to 8)\n" + " '-R' continue the image conversion in case of the sector rea= d error\n" " '-W' allow to write to the target out of order rather than s= equential\n" "\n" "Parameters to snapshot subcommand:\n" @@ -1579,6 +1580,7 @@ typedef struct ImgConvertState { int64_t wait_sector_num[MAX_COROUTINES]; CoMutex lock; int ret; + bool force_read; } ImgConvertState; =20 static void convert_select_part(ImgConvertState *s, int64_t sector_num, @@ -1693,7 +1695,15 @@ static int coroutine_fn convert_co_read(ImgConvertSt= ate *s, int64_t sector_num, blk, (sector_num - src_cur_offset) << BDRV_SECTOR_BITS, n << BDRV_SECTOR_BITS, &qiov, 0); if (ret < 0) { - return ret; + if (!s->force_read) { + return ret; + } + int64_t offset =3D (sector_num - src_cur_offset) << BDRV_SECTO= R_BITS; + unsigned int bytes =3D n << BDRV_SECTOR_BITS; + error_report("failed to read %d bytes at offset %" PRId64 ": %= s", + bytes, offset, strerror(-ret)); + memset(buf, 0, n * BDRV_SECTOR_SIZE); + /* TODO: retry to read smaller chunks */ } =20 sector_num +=3D n; @@ -2018,6 +2028,7 @@ static int img_convert(int argc, char **argv) .buf_sectors =3D IO_BUF_SIZE / BDRV_SECTOR_SIZE, .wr_in_order =3D true, .num_coroutines =3D 8, + .force_read =3D false, }; =20 for(;;) { @@ -2029,7 +2040,7 @@ static int img_convert(int argc, char **argv) {"target-image-opts", no_argument, 0, OPTION_TARGET_IMAGE_OPTS= }, {0, 0, 0, 0} }; - c =3D getopt_long(argc, argv, ":hf:O:B:Cco:l:S:pt:T:qnm:WU", + c =3D getopt_long(argc, argv, ":hf:O:B:Cco:l:S:pt:T:qnm:RWU", long_options, NULL); if (c =3D=3D -1) { break; @@ -2132,6 +2143,9 @@ static int img_convert(int argc, char **argv) case 'U': force_share =3D true; break; + case 'R': + s.force_read =3D true; + break; case OPTION_OBJECT: { QemuOpts *object_opts; object_opts =3D qemu_opts_parse_noisily(&qemu_object_opts, diff --git a/qemu-img.texi b/qemu-img.texi index 3b6710a..94f7d80 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -325,7 +325,7 @@ Error on reading data =20 @end table =20 -@item convert [--object @var{objectdef}] [--image-opts] [--target-image-op= ts] [-U] [-C] [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{= src_cache}] [-O @var{output_fmt}] [-B @var{backing_file}] [-o @var{options}= ] [-l @var{snapshot_param}] [-S @var{sparse_size}] [-m @var{num_coroutines}= ] [-W] @var{filename} [@var{filename2} [...]] @var{output_filename} +@item convert [--object @var{objectdef}] [--image-opts] [--target-image-op= ts] [-U] [-R] [-C] [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-T = @var{src_cache}] [-O @var{output_fmt}] [-B @var{backing_file}] [-o @var{opt= ions}] [-l @var{snapshot_param}] [-S @var{sparse_size}] [-m @var{num_corout= ines}] [-W] @var{filename} [@var{filename2} [...]] @var{output_filename} =20 Convert the disk image @var{filename} or a snapshot @var{snapshot_param} to disk image @var{output_filename} using format @var{output_fmt}. It can = be optionally compressed (@code{-c} --=20 1.8.3.1