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4c8158e359
qemu/tests/test-bdrv-drain.c
Max Reitz 4c8158e359 test-bdrv-drain: Add test for node deletion 
This patch adds two bdrv-drain tests for what happens if some BDS goes
away during the drainage.

The basic idea is that you have a parent BDS with some child nodes.
Then, you drain one of the children.  Because of that, the party who
actually owns the parent decides to (A) delete it, or (B) detach all its
children from it -- both while the child is still being drained.

A real-world case where this can happen is the mirror block job, which
may exit if you drain one of its children.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-06-18 15:03:25 +02:00

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/*
* Block node draining tests
*
* Copyright (c) 2017 Kevin Wolf <kwolf@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "block/block.h"
#include "block/blockjob_int.h"
#include "sysemu/block-backend.h"
#include "qapi/error.h"
#include "iothread.h"
static QemuEvent done_event;
typedef struct BDRVTestState {
int drain_count;
AioContext *bh_indirection_ctx;
} BDRVTestState;
static void coroutine_fn bdrv_test_co_drain_begin(BlockDriverState *bs)
{
BDRVTestState *s = bs->opaque;
s->drain_count++;
}
static void coroutine_fn bdrv_test_co_drain_end(BlockDriverState *bs)
{
BDRVTestState *s = bs->opaque;
s->drain_count--;
}
static void bdrv_test_close(BlockDriverState *bs)
{
BDRVTestState *s = bs->opaque;
g_assert_cmpint(s->drain_count, >, 0);
}
static void co_reenter_bh(void *opaque)
{
aio_co_wake(opaque);
}
static int coroutine_fn bdrv_test_co_preadv(BlockDriverState *bs,
uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
BDRVTestState *s = bs->opaque;
/* We want this request to stay until the polling loop in drain waits for
* it to complete. We need to sleep a while as bdrv_drain_invoke() comes
* first and polls its result, too, but it shouldn't accidentally complete
* this request yet. */
qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 100000);
if (s->bh_indirection_ctx) {
aio_bh_schedule_oneshot(s->bh_indirection_ctx, co_reenter_bh,
qemu_coroutine_self());
qemu_coroutine_yield();
}
return 0;
}
static BlockDriver bdrv_test = {
.format_name = "test",
.instance_size = sizeof(BDRVTestState),
.bdrv_close = bdrv_test_close,
.bdrv_co_preadv = bdrv_test_co_preadv,
.bdrv_co_drain_begin = bdrv_test_co_drain_begin,
.bdrv_co_drain_end = bdrv_test_co_drain_end,
.bdrv_child_perm = bdrv_format_default_perms,
};
static void aio_ret_cb(void *opaque, int ret)
{
int *aio_ret = opaque;
*aio_ret = ret;
}
typedef struct CallInCoroutineData {
void (*entry)(void);
bool done;
} CallInCoroutineData;
static coroutine_fn void call_in_coroutine_entry(void *opaque)
{
CallInCoroutineData *data = opaque;
data->entry();
data->done = true;
}
static void call_in_coroutine(void (*entry)(void))
{
Coroutine *co;
CallInCoroutineData data = {
.entry = entry,
.done = false,
};
co = qemu_coroutine_create(call_in_coroutine_entry, &data);
qemu_coroutine_enter(co);
while (!data.done) {
aio_poll(qemu_get_aio_context(), true);
}
}
enum drain_type {
BDRV_DRAIN_ALL,
BDRV_DRAIN,
BDRV_SUBTREE_DRAIN,
DRAIN_TYPE_MAX,
};
static void do_drain_begin(enum drain_type drain_type, BlockDriverState *bs)
{
switch (drain_type) {
case BDRV_DRAIN_ALL: bdrv_drain_all_begin(); break;
case BDRV_DRAIN: bdrv_drained_begin(bs); break;
case BDRV_SUBTREE_DRAIN: bdrv_subtree_drained_begin(bs); break;
default: g_assert_not_reached();
}
}
static void do_drain_end(enum drain_type drain_type, BlockDriverState *bs)
{
switch (drain_type) {
case BDRV_DRAIN_ALL: bdrv_drain_all_end(); break;
case BDRV_DRAIN: bdrv_drained_end(bs); break;
case BDRV_SUBTREE_DRAIN: bdrv_subtree_drained_end(bs); break;
default: g_assert_not_reached();
}
}
static void test_drv_cb_common(enum drain_type drain_type, bool recursive)
{
BlockBackend *blk;
BlockDriverState *bs, *backing;
BDRVTestState *s, *backing_s;
BlockAIOCB *acb;
int aio_ret;
QEMUIOVector qiov;
struct iovec iov = {
.iov_base = NULL,
.iov_len = 0,
};
qemu_iovec_init_external(&qiov, &iov, 1);
blk = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
bs = bdrv_new_open_driver(&bdrv_test, "test-node", BDRV_O_RDWR,
&error_abort);
s = bs->opaque;
blk_insert_bs(blk, bs, &error_abort);
backing = bdrv_new_open_driver(&bdrv_test, "backing", 0, &error_abort);
backing_s = backing->opaque;
bdrv_set_backing_hd(bs, backing, &error_abort);
/* Simple bdrv_drain_all_begin/end pair, check that CBs are called */
g_assert_cmpint(s->drain_count, ==, 0);
g_assert_cmpint(backing_s->drain_count, ==, 0);
do_drain_begin(drain_type, bs);
g_assert_cmpint(s->drain_count, ==, 1);
g_assert_cmpint(backing_s->drain_count, ==, !!recursive);
do_drain_end(drain_type, bs);
g_assert_cmpint(s->drain_count, ==, 0);
g_assert_cmpint(backing_s->drain_count, ==, 0);
/* Now do the same while a request is pending */
aio_ret = -EINPROGRESS;
acb = blk_aio_preadv(blk, 0, &qiov, 0, aio_ret_cb, &aio_ret);
g_assert(acb != NULL);
g_assert_cmpint(aio_ret, ==, -EINPROGRESS);
g_assert_cmpint(s->drain_count, ==, 0);
g_assert_cmpint(backing_s->drain_count, ==, 0);
do_drain_begin(drain_type, bs);
g_assert_cmpint(aio_ret, ==, 0);
g_assert_cmpint(s->drain_count, ==, 1);
g_assert_cmpint(backing_s->drain_count, ==, !!recursive);
do_drain_end(drain_type, bs);
g_assert_cmpint(s->drain_count, ==, 0);
g_assert_cmpint(backing_s->drain_count, ==, 0);
bdrv_unref(backing);
bdrv_unref(bs);
blk_unref(blk);
}
static void test_drv_cb_drain_all(void)
{
test_drv_cb_common(BDRV_DRAIN_ALL, true);
}
static void test_drv_cb_drain(void)
{
test_drv_cb_common(BDRV_DRAIN, false);
}
static void test_drv_cb_drain_subtree(void)
{
test_drv_cb_common(BDRV_SUBTREE_DRAIN, true);
}
static void test_drv_cb_co_drain_all(void)
{
call_in_coroutine(test_drv_cb_drain_all);
}
static void test_drv_cb_co_drain(void)
{
call_in_coroutine(test_drv_cb_drain);
}
static void test_drv_cb_co_drain_subtree(void)
{
call_in_coroutine(test_drv_cb_drain_subtree);
}
static void test_quiesce_common(enum drain_type drain_type, bool recursive)
{
BlockBackend *blk;
BlockDriverState *bs, *backing;
blk = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
bs = bdrv_new_open_driver(&bdrv_test, "test-node", BDRV_O_RDWR,
&error_abort);
blk_insert_bs(blk, bs, &error_abort);
backing = bdrv_new_open_driver(&bdrv_test, "backing", 0, &error_abort);
bdrv_set_backing_hd(bs, backing, &error_abort);
g_assert_cmpint(bs->quiesce_counter, ==, 0);
g_assert_cmpint(backing->quiesce_counter, ==, 0);
do_drain_begin(drain_type, bs);
g_assert_cmpint(bs->quiesce_counter, ==, 1);
g_assert_cmpint(backing->quiesce_counter, ==, !!recursive);
do_drain_end(drain_type, bs);
g_assert_cmpint(bs->quiesce_counter, ==, 0);
g_assert_cmpint(backing->quiesce_counter, ==, 0);
bdrv_unref(backing);
bdrv_unref(bs);
blk_unref(blk);
}
static void test_quiesce_drain_all(void)
{
test_quiesce_common(BDRV_DRAIN_ALL, true);
}
static void test_quiesce_drain(void)
{
test_quiesce_common(BDRV_DRAIN, false);
}
static void test_quiesce_drain_subtree(void)
{
test_quiesce_common(BDRV_SUBTREE_DRAIN, true);
}
static void test_quiesce_co_drain_all(void)
{
call_in_coroutine(test_quiesce_drain_all);
}
static void test_quiesce_co_drain(void)
{
call_in_coroutine(test_quiesce_drain);
}
static void test_quiesce_co_drain_subtree(void)
{
call_in_coroutine(test_quiesce_drain_subtree);
}
static void test_nested(void)
{
BlockBackend *blk;
BlockDriverState *bs, *backing;
BDRVTestState *s, *backing_s;
enum drain_type outer, inner;
blk = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
bs = bdrv_new_open_driver(&bdrv_test, "test-node", BDRV_O_RDWR,
&error_abort);
s = bs->opaque;
blk_insert_bs(blk, bs, &error_abort);
backing = bdrv_new_open_driver(&bdrv_test, "backing", 0, &error_abort);
backing_s = backing->opaque;
bdrv_set_backing_hd(bs, backing, &error_abort);
for (outer = 0; outer < DRAIN_TYPE_MAX; outer++) {
for (inner = 0; inner < DRAIN_TYPE_MAX; inner++) {
int backing_quiesce = (outer != BDRV_DRAIN) +
(inner != BDRV_DRAIN);
g_assert_cmpint(bs->quiesce_counter, ==, 0);
g_assert_cmpint(backing->quiesce_counter, ==, 0);
g_assert_cmpint(s->drain_count, ==, 0);
g_assert_cmpint(backing_s->drain_count, ==, 0);
do_drain_begin(outer, bs);
do_drain_begin(inner, bs);
g_assert_cmpint(bs->quiesce_counter, ==, 2);
g_assert_cmpint(backing->quiesce_counter, ==, backing_quiesce);
g_assert_cmpint(s->drain_count, ==, 2);
g_assert_cmpint(backing_s->drain_count, ==, backing_quiesce);
do_drain_end(inner, bs);
do_drain_end(outer, bs);
g_assert_cmpint(bs->quiesce_counter, ==, 0);
g_assert_cmpint(backing->quiesce_counter, ==, 0);
g_assert_cmpint(s->drain_count, ==, 0);
g_assert_cmpint(backing_s->drain_count, ==, 0);
}
}
bdrv_unref(backing);
bdrv_unref(bs);
blk_unref(blk);
}
static void test_multiparent(void)
{
BlockBackend *blk_a, *blk_b;
BlockDriverState *bs_a, *bs_b, *backing;
BDRVTestState *a_s, *b_s, *backing_s;
blk_a = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
bs_a = bdrv_new_open_driver(&bdrv_test, "test-node-a", BDRV_O_RDWR,
&error_abort);
a_s = bs_a->opaque;
blk_insert_bs(blk_a, bs_a, &error_abort);
blk_b = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
bs_b = bdrv_new_open_driver(&bdrv_test, "test-node-b", BDRV_O_RDWR,
&error_abort);
b_s = bs_b->opaque;
blk_insert_bs(blk_b, bs_b, &error_abort);
backing = bdrv_new_open_driver(&bdrv_test, "backing", 0, &error_abort);
backing_s = backing->opaque;
bdrv_set_backing_hd(bs_a, backing, &error_abort);
bdrv_set_backing_hd(bs_b, backing, &error_abort);
g_assert_cmpint(bs_a->quiesce_counter, ==, 0);
g_assert_cmpint(bs_b->quiesce_counter, ==, 0);
g_assert_cmpint(backing->quiesce_counter, ==, 0);
g_assert_cmpint(a_s->drain_count, ==, 0);
g_assert_cmpint(b_s->drain_count, ==, 0);
g_assert_cmpint(backing_s->drain_count, ==, 0);
do_drain_begin(BDRV_SUBTREE_DRAIN, bs_a);
g_assert_cmpint(bs_a->quiesce_counter, ==, 1);
g_assert_cmpint(bs_b->quiesce_counter, ==, 1);
g_assert_cmpint(backing->quiesce_counter, ==, 1);
g_assert_cmpint(a_s->drain_count, ==, 1);
g_assert_cmpint(b_s->drain_count, ==, 1);
g_assert_cmpint(backing_s->drain_count, ==, 1);
do_drain_begin(BDRV_SUBTREE_DRAIN, bs_b);
g_assert_cmpint(bs_a->quiesce_counter, ==, 2);
g_assert_cmpint(bs_b->quiesce_counter, ==, 2);
g_assert_cmpint(backing->quiesce_counter, ==, 2);
g_assert_cmpint(a_s->drain_count, ==, 2);
g_assert_cmpint(b_s->drain_count, ==, 2);
g_assert_cmpint(backing_s->drain_count, ==, 2);
do_drain_end(BDRV_SUBTREE_DRAIN, bs_b);
g_assert_cmpint(bs_a->quiesce_counter, ==, 1);
g_assert_cmpint(bs_b->quiesce_counter, ==, 1);
g_assert_cmpint(backing->quiesce_counter, ==, 1);
g_assert_cmpint(a_s->drain_count, ==, 1);
g_assert_cmpint(b_s->drain_count, ==, 1);
g_assert_cmpint(backing_s->drain_count, ==, 1);
do_drain_end(BDRV_SUBTREE_DRAIN, bs_a);
g_assert_cmpint(bs_a->quiesce_counter, ==, 0);
g_assert_cmpint(bs_b->quiesce_counter, ==, 0);
g_assert_cmpint(backing->quiesce_counter, ==, 0);
g_assert_cmpint(a_s->drain_count, ==, 0);
g_assert_cmpint(b_s->drain_count, ==, 0);
g_assert_cmpint(backing_s->drain_count, ==, 0);
bdrv_unref(backing);
bdrv_unref(bs_a);
bdrv_unref(bs_b);
blk_unref(blk_a);
blk_unref(blk_b);
}
static void test_graph_change(void)
{
BlockBackend *blk_a, *blk_b;
BlockDriverState *bs_a, *bs_b, *backing;
BDRVTestState *a_s, *b_s, *backing_s;
blk_a = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
bs_a = bdrv_new_open_driver(&bdrv_test, "test-node-a", BDRV_O_RDWR,
&error_abort);
a_s = bs_a->opaque;
blk_insert_bs(blk_a, bs_a, &error_abort);
blk_b = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
bs_b = bdrv_new_open_driver(&bdrv_test, "test-node-b", BDRV_O_RDWR,
&error_abort);
b_s = bs_b->opaque;
blk_insert_bs(blk_b, bs_b, &error_abort);
backing = bdrv_new_open_driver(&bdrv_test, "backing", 0, &error_abort);
backing_s = backing->opaque;
bdrv_set_backing_hd(bs_a, backing, &error_abort);
g_assert_cmpint(bs_a->quiesce_counter, ==, 0);
g_assert_cmpint(bs_b->quiesce_counter, ==, 0);
g_assert_cmpint(backing->quiesce_counter, ==, 0);
g_assert_cmpint(a_s->drain_count, ==, 0);
g_assert_cmpint(b_s->drain_count, ==, 0);
g_assert_cmpint(backing_s->drain_count, ==, 0);
do_drain_begin(BDRV_SUBTREE_DRAIN, bs_a);
do_drain_begin(BDRV_SUBTREE_DRAIN, bs_a);
do_drain_begin(BDRV_SUBTREE_DRAIN, bs_a);
do_drain_begin(BDRV_SUBTREE_DRAIN, bs_b);
do_drain_begin(BDRV_SUBTREE_DRAIN, bs_b);
bdrv_set_backing_hd(bs_b, backing, &error_abort);
g_assert_cmpint(bs_a->quiesce_counter, ==, 5);
g_assert_cmpint(bs_b->quiesce_counter, ==, 5);
g_assert_cmpint(backing->quiesce_counter, ==, 5);
g_assert_cmpint(a_s->drain_count, ==, 5);
g_assert_cmpint(b_s->drain_count, ==, 5);
g_assert_cmpint(backing_s->drain_count, ==, 5);
bdrv_set_backing_hd(bs_b, NULL, &error_abort);
g_assert_cmpint(bs_a->quiesce_counter, ==, 3);
g_assert_cmpint(bs_b->quiesce_counter, ==, 2);
g_assert_cmpint(backing->quiesce_counter, ==, 3);
g_assert_cmpint(a_s->drain_count, ==, 3);
g_assert_cmpint(b_s->drain_count, ==, 2);
g_assert_cmpint(backing_s->drain_count, ==, 3);
bdrv_set_backing_hd(bs_b, backing, &error_abort);
g_assert_cmpint(bs_a->quiesce_counter, ==, 5);
g_assert_cmpint(bs_b->quiesce_counter, ==, 5);
g_assert_cmpint(backing->quiesce_counter, ==, 5);
g_assert_cmpint(a_s->drain_count, ==, 5);
g_assert_cmpint(b_s->drain_count, ==, 5);
g_assert_cmpint(backing_s->drain_count, ==, 5);
do_drain_end(BDRV_SUBTREE_DRAIN, bs_b);
do_drain_end(BDRV_SUBTREE_DRAIN, bs_b);
do_drain_end(BDRV_SUBTREE_DRAIN, bs_a);
do_drain_end(BDRV_SUBTREE_DRAIN, bs_a);
do_drain_end(BDRV_SUBTREE_DRAIN, bs_a);
g_assert_cmpint(bs_a->quiesce_counter, ==, 0);
g_assert_cmpint(bs_b->quiesce_counter, ==, 0);
g_assert_cmpint(backing->quiesce_counter, ==, 0);
g_assert_cmpint(a_s->drain_count, ==, 0);
g_assert_cmpint(b_s->drain_count, ==, 0);
g_assert_cmpint(backing_s->drain_count, ==, 0);
bdrv_unref(backing);
bdrv_unref(bs_a);
bdrv_unref(bs_b);
blk_unref(blk_a);
blk_unref(blk_b);
}
struct test_iothread_data {
BlockDriverState *bs;
enum drain_type drain_type;
int *aio_ret;
};
static void test_iothread_drain_entry(void *opaque)
{
struct test_iothread_data *data = opaque;
aio_context_acquire(bdrv_get_aio_context(data->bs));
do_drain_begin(data->drain_type, data->bs);
g_assert_cmpint(*data->aio_ret, ==, 0);
do_drain_end(data->drain_type, data->bs);
aio_context_release(bdrv_get_aio_context(data->bs));
qemu_event_set(&done_event);
}
static void test_iothread_aio_cb(void *opaque, int ret)
{
int *aio_ret = opaque;
*aio_ret = ret;
qemu_event_set(&done_event);
}
/*
* Starts an AIO request on a BDS that runs in the AioContext of iothread 1.
* The request involves a BH on iothread 2 before it can complete.
*
* @drain_thread = 0 means that do_drain_begin/end are called from the main
* thread, @drain_thread = 1 means that they are called from iothread 1. Drain
* for this BDS cannot be called from iothread 2 because only the main thread
* may do cross-AioContext polling.
*/
static void test_iothread_common(enum drain_type drain_type, int drain_thread)
{
BlockBackend *blk;
BlockDriverState *bs;
BDRVTestState *s;
BlockAIOCB *acb;
int aio_ret;
struct test_iothread_data data;
IOThread *a = iothread_new();
IOThread *b = iothread_new();
AioContext *ctx_a = iothread_get_aio_context(a);
AioContext *ctx_b = iothread_get_aio_context(b);
QEMUIOVector qiov;
struct iovec iov = {
.iov_base = NULL,
.iov_len = 0,
};
qemu_iovec_init_external(&qiov, &iov, 1);
/* bdrv_drain_all() may only be called from the main loop thread */
if (drain_type == BDRV_DRAIN_ALL && drain_thread != 0) {
goto out;
}
blk = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
bs = bdrv_new_open_driver(&bdrv_test, "test-node", BDRV_O_RDWR,
&error_abort);
s = bs->opaque;
blk_insert_bs(blk, bs, &error_abort);
blk_set_aio_context(blk, ctx_a);
aio_context_acquire(ctx_a);
s->bh_indirection_ctx = ctx_b;
aio_ret = -EINPROGRESS;
if (drain_thread == 0) {
acb = blk_aio_preadv(blk, 0, &qiov, 0, test_iothread_aio_cb, &aio_ret);
} else {
acb = blk_aio_preadv(blk, 0, &qiov, 0, aio_ret_cb, &aio_ret);
}
g_assert(acb != NULL);
g_assert_cmpint(aio_ret, ==, -EINPROGRESS);
aio_context_release(ctx_a);
data = (struct test_iothread_data) {
.bs = bs,
.drain_type = drain_type,
.aio_ret = &aio_ret,
};
switch (drain_thread) {
case 0:
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_acquire(ctx_a);
}
/* The request is running on the IOThread a. Draining its block device
* will make sure that it has completed as far as the BDS is concerned,
* but the drain in this thread can continue immediately after
* bdrv_dec_in_flight() and aio_ret might be assigned only slightly
* later. */
qemu_event_reset(&done_event);
do_drain_begin(drain_type, bs);
g_assert_cmpint(bs->in_flight, ==, 0);
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_release(ctx_a);
}
qemu_event_wait(&done_event);
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_acquire(ctx_a);
}
g_assert_cmpint(aio_ret, ==, 0);
do_drain_end(drain_type, bs);
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_release(ctx_a);
}
break;
case 1:
qemu_event_reset(&done_event);
aio_bh_schedule_oneshot(ctx_a, test_iothread_drain_entry, &data);
qemu_event_wait(&done_event);
break;
default:
g_assert_not_reached();
}
aio_context_acquire(ctx_a);
blk_set_aio_context(blk, qemu_get_aio_context());
aio_context_release(ctx_a);
bdrv_unref(bs);
blk_unref(blk);
out:
iothread_join(a);
iothread_join(b);
}
static void test_iothread_drain_all(void)
{
test_iothread_common(BDRV_DRAIN_ALL, 0);
test_iothread_common(BDRV_DRAIN_ALL, 1);
}
static void test_iothread_drain(void)
{
test_iothread_common(BDRV_DRAIN, 0);
test_iothread_common(BDRV_DRAIN, 1);
}
static void test_iothread_drain_subtree(void)
{
test_iothread_common(BDRV_SUBTREE_DRAIN, 0);
test_iothread_common(BDRV_SUBTREE_DRAIN, 1);
}
typedef struct TestBlockJob {
BlockJob common;
bool should_complete;
} TestBlockJob;
static void test_job_completed(Job *job, void *opaque)
{
job_completed(job, 0, NULL);
}
static void coroutine_fn test_job_start(void *opaque)
{
TestBlockJob *s = opaque;
job_transition_to_ready(&s->common.job);
while (!s->should_complete) {
/* Avoid block_job_sleep_ns() because it marks the job as !busy. We
* want to emulate some actual activity (probably some I/O) here so
* that drain has to wait for this acitivity to stop. */
qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 100000);
job_pause_point(&s->common.job);
}
job_defer_to_main_loop(&s->common.job, test_job_completed, NULL);
}
static void test_job_complete(Job *job, Error **errp)
{
TestBlockJob *s = container_of(job, TestBlockJob, common.job);
s->should_complete = true;
}
BlockJobDriver test_job_driver = {
.job_driver = {
.instance_size = sizeof(TestBlockJob),
.free = block_job_free,
.user_resume = block_job_user_resume,
.drain = block_job_drain,
.start = test_job_start,
.complete = test_job_complete,
},
};
static void test_blockjob_common(enum drain_type drain_type)
{
BlockBackend *blk_src, *blk_target;
BlockDriverState *src, *target;
BlockJob *job;
int ret;
src = bdrv_new_open_driver(&bdrv_test, "source", BDRV_O_RDWR,
&error_abort);
blk_src = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
blk_insert_bs(blk_src, src, &error_abort);
target = bdrv_new_open_driver(&bdrv_test, "target", BDRV_O_RDWR,
&error_abort);
blk_target = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
blk_insert_bs(blk_target, target, &error_abort);
job = block_job_create("job0", &test_job_driver, NULL, src, 0, BLK_PERM_ALL,
0, 0, NULL, NULL, &error_abort);
block_job_add_bdrv(job, "target", target, 0, BLK_PERM_ALL, &error_abort);
job_start(&job->job);
g_assert_cmpint(job->job.pause_count, ==, 0);
g_assert_false(job->job.paused);
g_assert_true(job->job.busy); /* We're in job_sleep_ns() */
do_drain_begin(drain_type, src);
if (drain_type == BDRV_DRAIN_ALL) {
/* bdrv_drain_all() drains both src and target */
g_assert_cmpint(job->job.pause_count, ==, 2);
} else {
g_assert_cmpint(job->job.pause_count, ==, 1);
}
g_assert_true(job->job.paused);
g_assert_false(job->job.busy); /* The job is paused */
do_drain_end(drain_type, src);
g_assert_cmpint(job->job.pause_count, ==, 0);
g_assert_false(job->job.paused);
g_assert_true(job->job.busy); /* We're in qemu_co_sleep_ns() */
do_drain_begin(drain_type, target);
if (drain_type == BDRV_DRAIN_ALL) {
/* bdrv_drain_all() drains both src and target */
g_assert_cmpint(job->job.pause_count, ==, 2);
} else {
g_assert_cmpint(job->job.pause_count, ==, 1);
}
g_assert_true(job->job.paused);
g_assert_false(job->job.busy); /* The job is paused */
do_drain_end(drain_type, target);
g_assert_cmpint(job->job.pause_count, ==, 0);
g_assert_false(job->job.paused);
g_assert_true(job->job.busy); /* We're in job_sleep_ns() */
ret = job_complete_sync(&job->job, &error_abort);
g_assert_cmpint(ret, ==, 0);
blk_unref(blk_src);
blk_unref(blk_target);
bdrv_unref(src);
bdrv_unref(target);
}
static void test_blockjob_drain_all(void)
{
test_blockjob_common(BDRV_DRAIN_ALL);
}
static void test_blockjob_drain(void)
{
test_blockjob_common(BDRV_DRAIN);
}
static void test_blockjob_drain_subtree(void)
{
test_blockjob_common(BDRV_SUBTREE_DRAIN);
}
typedef struct BDRVTestTopState {
BdrvChild *wait_child;
} BDRVTestTopState;
static void bdrv_test_top_close(BlockDriverState *bs)
{
BdrvChild *c, *next_c;
QLIST_FOREACH_SAFE(c, &bs->children, next, next_c) {
bdrv_unref_child(bs, c);
}
}
static int coroutine_fn bdrv_test_top_co_preadv(BlockDriverState *bs,
uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
BDRVTestTopState *tts = bs->opaque;
return bdrv_co_preadv(tts->wait_child, offset, bytes, qiov, flags);
}
static BlockDriver bdrv_test_top_driver = {
.format_name = "test_top_driver",
.instance_size = sizeof(BDRVTestTopState),
.bdrv_close = bdrv_test_top_close,
.bdrv_co_preadv = bdrv_test_top_co_preadv,
.bdrv_child_perm = bdrv_format_default_perms,
};
typedef struct TestCoDeleteByDrainData {
BlockBackend *blk;
bool detach_instead_of_delete;
bool done;
} TestCoDeleteByDrainData;
static void coroutine_fn test_co_delete_by_drain(void *opaque)
{
TestCoDeleteByDrainData *dbdd = opaque;
BlockBackend *blk = dbdd->blk;
BlockDriverState *bs = blk_bs(blk);
BDRVTestTopState *tts = bs->opaque;
void *buffer = g_malloc(65536);
QEMUIOVector qiov;
struct iovec iov = {
.iov_base = buffer,
.iov_len = 65536,
};
qemu_iovec_init_external(&qiov, &iov, 1);
/* Pretend some internal write operation from parent to child.
* Important: We have to read from the child, not from the parent!
* Draining works by first propagating it all up the tree to the
* root and then waiting for drainage from root to the leaves
* (protocol nodes). If we have a request waiting on the root,
* everything will be drained before we go back down the tree, but
* we do not want that. We want to be in the middle of draining
* when this following requests returns. */
bdrv_co_preadv(tts->wait_child, 0, 65536, &qiov, 0);
g_assert_cmpint(bs->refcnt, ==, 1);
if (!dbdd->detach_instead_of_delete) {
blk_unref(blk);
} else {
BdrvChild *c, *next_c;
QLIST_FOREACH_SAFE(c, &bs->children, next, next_c) {
bdrv_unref_child(bs, c);
}
}
dbdd->done = true;
}
/**
* Test what happens when some BDS has some children, you drain one of
* them and this results in the BDS being deleted.
*
* If @detach_instead_of_delete is set, the BDS is not going to be
* deleted but will only detach all of its children.
*/
static void do_test_delete_by_drain(bool detach_instead_of_delete)
{
BlockBackend *blk;
BlockDriverState *bs, *child_bs, *null_bs;
BDRVTestTopState *tts;
TestCoDeleteByDrainData dbdd;
Coroutine *co;
bs = bdrv_new_open_driver(&bdrv_test_top_driver, "top", BDRV_O_RDWR,
&error_abort);
bs->total_sectors = 65536 >> BDRV_SECTOR_BITS;
tts = bs->opaque;
null_bs = bdrv_open("null-co://", NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL,
&error_abort);
bdrv_attach_child(bs, null_bs, "null-child", &child_file, &error_abort);
/* This child will be the one to pass to requests through to, and
* it will stall until a drain occurs */
child_bs = bdrv_new_open_driver(&bdrv_test, "child", BDRV_O_RDWR,
&error_abort);
child_bs->total_sectors = 65536 >> BDRV_SECTOR_BITS;
/* Takes our reference to child_bs */
tts->wait_child = bdrv_attach_child(bs, child_bs, "wait-child", &child_file,
&error_abort);
/* This child is just there to be deleted
* (for detach_instead_of_delete == true) */
null_bs = bdrv_open("null-co://", NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL,
&error_abort);
bdrv_attach_child(bs, null_bs, "null-child", &child_file, &error_abort);
blk = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
blk_insert_bs(blk, bs, &error_abort);
/* Referenced by blk now */
bdrv_unref(bs);
g_assert_cmpint(bs->refcnt, ==, 1);
g_assert_cmpint(child_bs->refcnt, ==, 1);
g_assert_cmpint(null_bs->refcnt, ==, 1);
dbdd = (TestCoDeleteByDrainData){
.blk = blk,
.detach_instead_of_delete = detach_instead_of_delete,
.done = false,
};
co = qemu_coroutine_create(test_co_delete_by_drain, &dbdd);
qemu_coroutine_enter(co);
/* Drain the child while the read operation is still pending.
* This should result in the operation finishing and
* test_co_delete_by_drain() resuming. Thus, @bs will be deleted
* and the coroutine will exit while this drain operation is still
* in progress. */
bdrv_ref(child_bs);
bdrv_drain(child_bs);
bdrv_unref(child_bs);
while (!dbdd.done) {
aio_poll(qemu_get_aio_context(), true);
}
if (detach_instead_of_delete) {
/* Here, the reference has not passed over to the coroutine,
* so we have to delete the BB ourselves */
blk_unref(blk);
}
}
static void test_delete_by_drain(void)
{
do_test_delete_by_drain(false);
}
static void test_detach_by_drain(void)
{
do_test_delete_by_drain(true);
}
int main(int argc, char **argv)
{
int ret;
bdrv_init();
qemu_init_main_loop(&error_abort);
g_test_init(&argc, &argv, NULL);
qemu_event_init(&done_event, false);
g_test_add_func("/bdrv-drain/driver-cb/drain_all", test_drv_cb_drain_all);
g_test_add_func("/bdrv-drain/driver-cb/drain", test_drv_cb_drain);
g_test_add_func("/bdrv-drain/driver-cb/drain_subtree",
test_drv_cb_drain_subtree);
g_test_add_func("/bdrv-drain/driver-cb/co/drain_all",
test_drv_cb_co_drain_all);
g_test_add_func("/bdrv-drain/driver-cb/co/drain", test_drv_cb_co_drain);
g_test_add_func("/bdrv-drain/driver-cb/co/drain_subtree",
test_drv_cb_co_drain_subtree);
g_test_add_func("/bdrv-drain/quiesce/drain_all", test_quiesce_drain_all);
g_test_add_func("/bdrv-drain/quiesce/drain", test_quiesce_drain);
g_test_add_func("/bdrv-drain/quiesce/drain_subtree",
test_quiesce_drain_subtree);
g_test_add_func("/bdrv-drain/quiesce/co/drain_all",
test_quiesce_co_drain_all);
g_test_add_func("/bdrv-drain/quiesce/co/drain", test_quiesce_co_drain);
g_test_add_func("/bdrv-drain/quiesce/co/drain_subtree",
test_quiesce_co_drain_subtree);
g_test_add_func("/bdrv-drain/nested", test_nested);
g_test_add_func("/bdrv-drain/multiparent", test_multiparent);
g_test_add_func("/bdrv-drain/graph-change", test_graph_change);
g_test_add_func("/bdrv-drain/iothread/drain_all", test_iothread_drain_all);
g_test_add_func("/bdrv-drain/iothread/drain", test_iothread_drain);
g_test_add_func("/bdrv-drain/iothread/drain_subtree",
test_iothread_drain_subtree);
g_test_add_func("/bdrv-drain/blockjob/drain_all", test_blockjob_drain_all);
g_test_add_func("/bdrv-drain/blockjob/drain", test_blockjob_drain);
g_test_add_func("/bdrv-drain/blockjob/drain_subtree",
test_blockjob_drain_subtree);
g_test_add_func("/bdrv-drain/deletion", test_delete_by_drain);
g_test_add_func("/bdrv-drain/detach", test_detach_by_drain);
ret = g_test_run();
qemu_event_destroy(&done_event);
return ret;
}
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