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From d84814e298e3b05fb5bc61cc8e641a5e104d32d5 Mon Sep 17 00:00:00 2001
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From: Juan Quintela <quintela@redhat.com>
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Date: Tue, 3 Mar 2020 14:51:39 +0000
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Subject: [PATCH 07/18] qemu-file: Don't do IO after shutdown
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RH-Author: Juan Quintela <quintela@redhat.com>
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Message-id: <20200303145143.149290-7-quintela@redhat.com>
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Patchwork-id: 94116
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH v2 06/10] qemu-file: Don't do IO after shutdown
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Bugzilla: 1738451
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Be sure that we are not doing neither read/write after shutdown of the
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QEMUFile.
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit a555b8092abc6f1bbe4b64c516679cbd68fcfbd8)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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migration/qemu-file.c | 22 +++++++++++++++++++++-
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1 file changed, 21 insertions(+), 1 deletion(-)
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diff --git a/migration/qemu-file.c b/migration/qemu-file.c
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index 26fb25d..bbb2b63 100644
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--- a/migration/qemu-file.c
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+++ b/migration/qemu-file.c
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@@ -53,6 +53,8 @@ struct QEMUFile {
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int last_error;
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Error *last_error_obj;
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+ /* has the file has been shutdown */
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+ bool shutdown;
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};
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/*
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@@ -61,10 +63,18 @@ struct QEMUFile {
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*/
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int qemu_file_shutdown(QEMUFile *f)
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{
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+ int ret;
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+
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+ f->shutdown = true;
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if (!f->ops->shut_down) {
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return -ENOSYS;
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}
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- return f->ops->shut_down(f->opaque, true, true, NULL);
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+ ret = f->ops->shut_down(f->opaque, true, true, NULL);
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+
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+ if (!f->last_error) {
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+ qemu_file_set_error(f, -EIO);
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+ }
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+ return ret;
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}
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/*
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@@ -214,6 +224,9 @@ void qemu_fflush(QEMUFile *f)
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return;
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}
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+ if (f->shutdown) {
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+ return;
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+ }
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if (f->iovcnt > 0) {
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expect = iov_size(f->iov, f->iovcnt);
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ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos,
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@@ -328,6 +341,10 @@ static ssize_t qemu_fill_buffer(QEMUFile *f)
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f->buf_index = 0;
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f->buf_size = pending;
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+ if (f->shutdown) {
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+ return 0;
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+ }
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+
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len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
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IO_BUF_SIZE - pending, &local_error);
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if (len > 0) {
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@@ -642,6 +659,9 @@ int64_t qemu_ftell(QEMUFile *f)
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int qemu_file_rate_limit(QEMUFile *f)
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{
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+ if (f->shutdown) {
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+ return 1;
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+ }
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if (qemu_file_get_error(f)) {
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return 1;
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}
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--
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1.8.3.1
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