blkdebug: move post-resume handling to resume_req_by_tag
We want to move qemu_coroutine_yield() after the loop on rules, because QLIST_FOREACH_SAFE is wrong if the rule list is modified while the coroutine has yielded. Therefore move the suspended request to the heap and clean it up from the remove side. All that is left is for blkdebug_debug_event to handle the yielding. Co-developed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20210614082931.24925-3-eesposit@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
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@ -775,25 +775,20 @@ static void blkdebug_close(BlockDriverState *bs)
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static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule)
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static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule)
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{
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{
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BDRVBlkdebugState *s = bs->opaque;
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BDRVBlkdebugState *s = bs->opaque;
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BlkdebugSuspendedReq r;
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BlkdebugSuspendedReq *r;
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r = (BlkdebugSuspendedReq) {
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r = g_new(BlkdebugSuspendedReq, 1);
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.co = qemu_coroutine_self(),
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.tag = g_strdup(rule->options.suspend.tag),
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r->co = qemu_coroutine_self();
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};
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r->tag = g_strdup(rule->options.suspend.tag);
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remove_rule(rule);
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remove_rule(rule);
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QLIST_INSERT_HEAD(&s->suspended_reqs, &r, next);
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QLIST_INSERT_HEAD(&s->suspended_reqs, r, next);
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if (!qtest_enabled()) {
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if (!qtest_enabled()) {
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printf("blkdebug: Suspended request '%s'\n", r.tag);
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printf("blkdebug: Suspended request '%s'\n", r->tag);
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}
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}
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qemu_coroutine_yield();
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qemu_coroutine_yield();
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if (!qtest_enabled()) {
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printf("blkdebug: Resuming request '%s'\n", r.tag);
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}
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g_free(r.tag);
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}
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}
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static bool process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
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static bool process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
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@ -880,8 +875,18 @@ retry:
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*/
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*/
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QLIST_FOREACH(r, &s->suspended_reqs, next) {
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QLIST_FOREACH(r, &s->suspended_reqs, next) {
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if (!strcmp(r->tag, tag)) {
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if (!strcmp(r->tag, tag)) {
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Coroutine *co = r->co;
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if (!qtest_enabled()) {
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printf("blkdebug: Resuming request '%s'\n", r->tag);
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}
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QLIST_REMOVE(r, next);
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QLIST_REMOVE(r, next);
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qemu_coroutine_enter(r->co);
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g_free(r->tag);
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g_free(r);
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qemu_coroutine_enter(co);
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if (all) {
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if (all) {
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goto retry;
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goto retry;
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}
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}
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