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From 0a37ee43ee671c7cbd02110f9e968dbd530d2a4e Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Fri, 6 Jul 2018 17:56:52 +0200
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Subject: [PATCH 192/268] pr-helper: fix assertion failure on failed multipath
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PERSISTENT RESERVE IN
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <20180706175659.30615-3-pbonzini@redhat.com>
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Patchwork-id: 81246
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O-Subject: [RHEL7.6 qemu-kvm-rhev PATCH 2/9] pr-helper: fix assertion failure on failed multipath PERSISTENT RESERVE IN
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Bugzilla: 1533158
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Michal Privoznik <mprivozn@redhat.com>
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The response size is expected to be zero if the SCSI status is not
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"GOOD", but nothing was resetting it.
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This can be reproduced simply by "sg_persist -s /dev/sdb" where /dev/sdb
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in the guest is a scsi-block device corresponding to a multipath device
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on the host.
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Before:
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PR in (Read full status): Aborted command
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and on the host:
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prh_write_response: Assertion `resp->sz == 0' failed.
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After:
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PR in (Read full status): bad field in cdb or parameter list
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(perhaps unsupported service action)
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Reported-by: Jiri Belka <jbelka@redhat.com>
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Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
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Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
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(cherry picked from commit 86933b4e7879e427e03365bf352c0964640cb37b)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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scsi/qemu-pr-helper.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/scsi/qemu-pr-helper.c b/scsi/qemu-pr-helper.c
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index 4057cf3..0218d65 100644
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--- a/scsi/qemu-pr-helper.c
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+++ b/scsi/qemu-pr-helper.c
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@@ -558,7 +558,11 @@ static int do_pr_in(int fd, const uint8_t *cdb, uint8_t *sense,
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#ifdef CONFIG_MPATH
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if (is_mpath(fd)) {
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/* multipath_pr_in fills the whole input buffer. */
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- return multipath_pr_in(fd, cdb, sense, data, *resp_sz);
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+ int r = multipath_pr_in(fd, cdb, sense, data, *resp_sz);
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+ if (r != GOOD) {
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+ *resp_sz = 0;
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+ }
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+ return r;
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}
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#endif
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--
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1.8.3.1
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