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qemu/tests/test-bdrv-drain.c

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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;
bool sleep_in_drain_begin;
} BDRVTestState;
static void coroutine_fn bdrv_test_co_drain_begin(BlockDriverState *bs)
{
BDRVTestState *s = bs->opaque;
s->drain_count++;
if (s->sleep_in_drain_begin) {
qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 100000);
}
}
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 void bdrv_test_child_perm(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared)
{
/* bdrv_format_default_perms() accepts only these two, so disguise
* detach_by_driver_cb_role as one of them. */
if (role != &child_file && role != &child_backing) {
role = &child_file;
}
bdrv_format_default_perms(bs, c, role, reopen_queue, perm, shared,
nperm, nshared);
}
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_test_child_perm,
};
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_drain_subtree(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);
}
static void test_graph_change_drain_all(void)
{
BlockBackend *blk_a, *blk_b;
BlockDriverState *bs_a, *bs_b;
BDRVTestState *a_s, *b_s;
/* Create node A with a BlockBackend */
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);
g_assert_cmpint(bs_a->quiesce_counter, ==, 0);
g_assert_cmpint(a_s->drain_count, ==, 0);
/* Call bdrv_drain_all_begin() */
bdrv_drain_all_begin();
g_assert_cmpint(bs_a->quiesce_counter, ==, 1);
g_assert_cmpint(a_s->drain_count, ==, 1);
/* Create node B with a BlockBackend */
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);
g_assert_cmpint(bs_a->quiesce_counter, ==, 1);
g_assert_cmpint(bs_b->quiesce_counter, ==, 1);
g_assert_cmpint(a_s->drain_count, ==, 1);
g_assert_cmpint(b_s->drain_count, ==, 1);
/* Unref and finally delete node A */
blk_unref(blk_a);
g_assert_cmpint(bs_a->quiesce_counter, ==, 1);
g_assert_cmpint(bs_b->quiesce_counter, ==, 1);
g_assert_cmpint(a_s->drain_count, ==, 1);
g_assert_cmpint(b_s->drain_count, ==, 1);
bdrv_unref(bs_a);
g_assert_cmpint(bs_b->quiesce_counter, ==, 1);
g_assert_cmpint(b_s->drain_count, ==, 1);
/* End the drained section */
bdrv_drain_all_end();
g_assert_cmpint(bs_b->quiesce_counter, ==, 0);
g_assert_cmpint(b_s->drain_count, ==, 0);
bdrv_unref(bs_b);
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,
enum drain_type drain_type)
{
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. */
switch (drain_type) {
case BDRV_DRAIN:
bdrv_ref(child_bs);
bdrv_drain(child_bs);
bdrv_unref(child_bs);
break;
case BDRV_SUBTREE_DRAIN:
/* Would have to ref/unref bs here for !detach_instead_of_delete, but
* then the whole test becomes pointless because the graph changes
* don't occur during the drain any more. */
assert(detach_instead_of_delete);
bdrv_subtree_drained_begin(bs);
bdrv_subtree_drained_end(bs);
break;
case BDRV_DRAIN_ALL:
bdrv_drain_all_begin();
bdrv_drain_all_end();
break;
default:
g_assert_not_reached();
}
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, BDRV_DRAIN);
}
static void test_detach_by_drain_all(void)
{
do_test_delete_by_drain(true, BDRV_DRAIN_ALL);
}
static void test_detach_by_drain(void)
{
do_test_delete_by_drain(true, BDRV_DRAIN);
}
static void test_detach_by_drain_subtree(void)
{
do_test_delete_by_drain(true, BDRV_SUBTREE_DRAIN);
}
struct detach_by_parent_data {
BlockDriverState *parent_b;
BdrvChild *child_b;
BlockDriverState *c;
BdrvChild *child_c;
bool by_parent_cb;
};
static struct detach_by_parent_data detach_by_parent_data;
static void detach_indirect_bh(void *opaque)
{
struct detach_by_parent_data *data = opaque;
bdrv_unref_child(data->parent_b, data->child_b);
bdrv_ref(data->c);
data->child_c = bdrv_attach_child(data->parent_b, data->c, "PB-C",
&child_file, &error_abort);
}
static void detach_by_parent_aio_cb(void *opaque, int ret)
{
struct detach_by_parent_data *data = &detach_by_parent_data;
g_assert_cmpint(ret, ==, 0);
if (data->by_parent_cb) {
detach_indirect_bh(data);
}
}
static void detach_by_driver_cb_drained_begin(BdrvChild *child)
{
aio_bh_schedule_oneshot(qemu_get_current_aio_context(),
detach_indirect_bh, &detach_by_parent_data);
child_file.drained_begin(child);
}
static BdrvChildRole detach_by_driver_cb_role;
/*
* Initial graph:
*
* PA PB
* \ / \
* A B C
*
* by_parent_cb == true: Test that parent callbacks don't poll
*
* PA has a pending write request whose callback changes the child nodes of
* PB: It removes B and adds C instead. The subtree of PB is drained, which
* will indirectly drain the write request, too.
*
* by_parent_cb == false: Test that bdrv_drain_invoke() doesn't poll
*
* PA's BdrvChildRole has a .drained_begin callback that schedules a BH
* that does the same graph change. If bdrv_drain_invoke() calls it, the
* state is messed up, but if it is only polled in the single
* BDRV_POLL_WHILE() at the end of the drain, this should work fine.
*/
static void test_detach_indirect(bool by_parent_cb)
{
BlockBackend *blk;
BlockDriverState *parent_a, *parent_b, *a, *b, *c;
BdrvChild *child_a, *child_b;
BlockAIOCB *acb;
QEMUIOVector qiov;
struct iovec iov = {
.iov_base = NULL,
.iov_len = 0,
};
qemu_iovec_init_external(&qiov, &iov, 1);
if (!by_parent_cb) {
detach_by_driver_cb_role = child_file;
detach_by_driver_cb_role.drained_begin =
detach_by_driver_cb_drained_begin;
}
/* Create all involved nodes */
parent_a = bdrv_new_open_driver(&bdrv_test, "parent-a", BDRV_O_RDWR,
&error_abort);
parent_b = bdrv_new_open_driver(&bdrv_test, "parent-b", 0,
&error_abort);
a = bdrv_new_open_driver(&bdrv_test, "a", BDRV_O_RDWR, &error_abort);
b = bdrv_new_open_driver(&bdrv_test, "b", BDRV_O_RDWR, &error_abort);
c = bdrv_new_open_driver(&bdrv_test, "c", BDRV_O_RDWR, &error_abort);
/* blk is a BB for parent-a */
blk = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
blk_insert_bs(blk, parent_a, &error_abort);
bdrv_unref(parent_a);
/* If we want to get bdrv_drain_invoke() to call aio_poll(), the driver
* callback must not return immediately. */
if (!by_parent_cb) {
BDRVTestState *s = parent_a->opaque;
s->sleep_in_drain_begin = true;
}
/* Set child relationships */
bdrv_ref(b);
bdrv_ref(a);
child_b = bdrv_attach_child(parent_b, b, "PB-B", &child_file, &error_abort);
child_a = bdrv_attach_child(parent_b, a, "PB-A", &child_backing, &error_abort);
bdrv_ref(a);
bdrv_attach_child(parent_a, a, "PA-A",
by_parent_cb ? &child_file : &detach_by_driver_cb_role,
&error_abort);
g_assert_cmpint(parent_a->refcnt, ==, 1);
g_assert_cmpint(parent_b->refcnt, ==, 1);
g_assert_cmpint(a->refcnt, ==, 3);
g_assert_cmpint(b->refcnt, ==, 2);
g_assert_cmpint(c->refcnt, ==, 1);
g_assert(QLIST_FIRST(&parent_b->children) == child_a);
g_assert(QLIST_NEXT(child_a, next) == child_b);
g_assert(QLIST_NEXT(child_b, next) == NULL);
/* Start the evil write request */
detach_by_parent_data = (struct detach_by_parent_data) {
.parent_b = parent_b,
.child_b = child_b,
.c = c,
.by_parent_cb = by_parent_cb,
};
acb = blk_aio_preadv(blk, 0, &qiov, 0, detach_by_parent_aio_cb, NULL);
g_assert(acb != NULL);
/* Drain and check the expected result */
bdrv_subtree_drained_begin(parent_b);
g_assert(detach_by_parent_data.child_c != NULL);
g_assert_cmpint(parent_a->refcnt, ==, 1);
g_assert_cmpint(parent_b->refcnt, ==, 1);
g_assert_cmpint(a->refcnt, ==, 3);
g_assert_cmpint(b->refcnt, ==, 1);
g_assert_cmpint(c->refcnt, ==, 2);
g_assert(QLIST_FIRST(&parent_b->children) == detach_by_parent_data.child_c);
g_assert(QLIST_NEXT(detach_by_parent_data.child_c, next) == child_a);
g_assert(QLIST_NEXT(child_a, next) == NULL);
g_assert_cmpint(parent_a->quiesce_counter, ==, 1);
g_assert_cmpint(parent_b->quiesce_counter, ==, 1);
g_assert_cmpint(a->quiesce_counter, ==, 1);
g_assert_cmpint(b->quiesce_counter, ==, 0);
g_assert_cmpint(c->quiesce_counter, ==, 1);
bdrv_subtree_drained_end(parent_b);
bdrv_unref(parent_b);
blk_unref(blk);
/* XXX Once bdrv_close() unref's children instead of just detaching them,
* this won't be necessary any more. */
bdrv_unref(a);
bdrv_unref(a);
bdrv_unref(c);
g_assert_cmpint(a->refcnt, ==, 1);
g_assert_cmpint(b->refcnt, ==, 1);
g_assert_cmpint(c->refcnt, ==, 1);
bdrv_unref(a);
bdrv_unref(b);
bdrv_unref(c);
}
static void test_detach_by_parent_cb(void)
{
test_detach_indirect(true);
}
static void test_detach_by_driver_cb(void)
{
test_detach_indirect(false);
}
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/drain_subtree",
test_graph_change_drain_subtree);
g_test_add_func("/bdrv-drain/graph-change/drain_all",
test_graph_change_drain_all);
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/drain", test_delete_by_drain);
g_test_add_func("/bdrv-drain/detach/drain_all", test_detach_by_drain_all);
g_test_add_func("/bdrv-drain/detach/drain", test_detach_by_drain);
g_test_add_func("/bdrv-drain/detach/drain_subtree", test_detach_by_drain_subtree);
g_test_add_func("/bdrv-drain/detach/parent_cb", test_detach_by_parent_cb);
g_test_add_func("/bdrv-drain/detach/driver_cb", test_detach_by_driver_cb);
ret = g_test_run();
qemu_event_destroy(&done_event);
return ret;
}
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