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Blame SOURCES/kvm-block-curl-Don-t-lose-original-error-when-a-connecti.patch

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From 264a2066904d31c46860e0bac8790d57e6498b80 Mon Sep 17 00:00:00 2001
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From: Richard Jones <rjones@redhat.com>
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Date: Thu, 16 Jul 2015 15:41:54 +0200
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Subject: [PATCH 1/5] block/curl: Don't lose original error when a connection
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 fails.
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Message-id: <1437061314-4775-1-git-send-email-rjones@redhat.com>
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Patchwork-id: 67043
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O-Subject: [RHEL-7.2 qemu-kvm PATCH v3] block/curl: Don't lose original error when a connection fails.
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Bugzilla: 1235812
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Currently if qemu is connected to a curl source (eg. web server), and
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the web server fails / times out / dies, you always see a bogus EIO
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"Input/output error".
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For example, choose a large file located on any local webserver which
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you control:
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  $ qemu-img convert -p http://example.com/large.iso /tmp/test
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Once it starts copying the file, stop the webserver and you will see
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qemu-img fail with:
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  qemu-img: error while reading sector 61440: Input/output error
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This patch does two things: Firstly print the actual error from curl
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so it doesn't get lost.  Secondly, change EIO to EPROTO.  EPROTO is a
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POSIX.1 compatible errno which more accurately reflects that there was
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a protocol error, rather than some kind of hardware failure.
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After this patch is applied, the error changes to:
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  $ qemu-img convert -p http://example.com/large.iso /tmp/test
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  qemu-img: curl: transfer closed with 469989 bytes remaining to read
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  qemu-img: error while reading sector 16384: Protocol error
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Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Jeff Cody <jcody@redhat.com>
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BZ: https://bugzilla.redhat.com/1235812
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Brew: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=9529354
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Upstream-status: 796a060bc0fab40953997976a2e30d9d6235bc7b
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---
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 block/curl.c | 15 ++++++++++++++-
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 1 file changed, 14 insertions(+), 1 deletion(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 block/curl.c | 15 ++++++++++++++-
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 1 file changed, 14 insertions(+), 1 deletion(-)
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diff --git a/block/curl.c b/block/curl.c
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index 3088329..dfa8cee 100644
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--- a/block/curl.c
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+++ b/block/curl.c
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@@ -22,6 +22,7 @@
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  * THE SOFTWARE.
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  */
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 #include "qemu-common.h"
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+#include "qemu/error-report.h"
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 #include "block/block_int.h"
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 #include "qapi/qmp/qbool.h"
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 #include <curl/curl.h>
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@@ -294,6 +295,18 @@ static void curl_multi_check_completion(BDRVCURLState *s)
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             /* ACBs for successful messages get completed in curl_read_cb */
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             if (msg->data.result != CURLE_OK) {
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                 int i;
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+                static int errcount = 100;
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+
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+                /* Don't lose the original error message from curl, since
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+                 * it contains extra data.
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+                 */
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+                if (errcount > 0) {
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+                    error_report("curl: %s", state->errmsg);
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+                    if (--errcount == 0) {
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+                        error_report("curl: further errors suppressed");
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+                    }
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+                }
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+
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                 for (i = 0; i < CURL_NUM_ACB; i++) {
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                     CURLAIOCB *acb = state->acb[i];
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@@ -301,7 +314,7 @@ static void curl_multi_check_completion(BDRVCURLState *s)
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                         continue;
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                     }
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-                    acb->common.cb(acb->common.opaque, -EIO);
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+                    acb->common.cb(acb->common.opaque, -EPROTO);
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                     qemu_aio_release(acb);
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                     state->acb[i] = NULL;
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                 }
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-- 
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1.8.3.1
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