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test-bdrv-drain: Test BlockDriver callbacks for drain
[qemu.git] / tests / test-bdrv-drain.c
1 /*
2  * Block node draining tests
3  *
4  * Copyright (c) 2017 Kevin Wolf <[email protected]>
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24
25 #include "qemu/osdep.h"
26 #include "block/block.h"
27 #include "sysemu/block-backend.h"
28 #include "qapi/error.h"
29
30 typedef struct BDRVTestState {
31     int drain_count;
32 } BDRVTestState;
33
34 static void coroutine_fn bdrv_test_co_drain_begin(BlockDriverState *bs)
35 {
36     BDRVTestState *s = bs->opaque;
37     s->drain_count++;
38 }
39
40 static void coroutine_fn bdrv_test_co_drain_end(BlockDriverState *bs)
41 {
42     BDRVTestState *s = bs->opaque;
43     s->drain_count--;
44 }
45
46 static void bdrv_test_close(BlockDriverState *bs)
47 {
48     BDRVTestState *s = bs->opaque;
49     g_assert_cmpint(s->drain_count, >, 0);
50 }
51
52 static int coroutine_fn bdrv_test_co_preadv(BlockDriverState *bs,
53                                             uint64_t offset, uint64_t bytes,
54                                             QEMUIOVector *qiov, int flags)
55 {
56     /* We want this request to stay until the polling loop in drain waits for
57      * it to complete. We need to sleep a while as bdrv_drain_invoke() comes
58      * first and polls its result, too, but it shouldn't accidentally complete
59      * this request yet. */
60     qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 100000);
61
62     return 0;
63 }
64
65 static BlockDriver bdrv_test = {
66     .format_name            = "test",
67     .instance_size          = sizeof(BDRVTestState),
68
69     .bdrv_close             = bdrv_test_close,
70     .bdrv_co_preadv         = bdrv_test_co_preadv,
71
72     .bdrv_co_drain_begin    = bdrv_test_co_drain_begin,
73     .bdrv_co_drain_end      = bdrv_test_co_drain_end,
74 };
75
76 static void aio_ret_cb(void *opaque, int ret)
77 {
78     int *aio_ret = opaque;
79     *aio_ret = ret;
80 }
81
82 static void test_drv_cb_drain_all(void)
83 {
84     BlockBackend *blk;
85     BlockDriverState *bs;
86     BDRVTestState *s;
87     BlockAIOCB *acb;
88     int aio_ret;
89
90     QEMUIOVector qiov;
91     struct iovec iov = {
92         .iov_base = NULL,
93         .iov_len = 0,
94     };
95     qemu_iovec_init_external(&qiov, &iov, 1);
96
97     blk = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
98     bs = bdrv_new_open_driver(&bdrv_test, "test-node", BDRV_O_RDWR,
99                               &error_abort);
100     s = bs->opaque;
101     blk_insert_bs(blk, bs, &error_abort);
102
103     /* Simple bdrv_drain_all_begin/end pair, check that CBs are called */
104     g_assert_cmpint(s->drain_count, ==, 0);
105     bdrv_drain_all_begin();
106     g_assert_cmpint(s->drain_count, ==, 1);
107     bdrv_drain_all_end();
108     g_assert_cmpint(s->drain_count, ==, 0);
109
110     /* Now do the same while a request is pending */
111     aio_ret = -EINPROGRESS;
112     acb = blk_aio_preadv(blk, 0, &qiov, 0, aio_ret_cb, &aio_ret);
113     g_assert(acb != NULL);
114     g_assert_cmpint(aio_ret, ==, -EINPROGRESS);
115
116     g_assert_cmpint(s->drain_count, ==, 0);
117     bdrv_drain_all_begin();
118     g_assert_cmpint(aio_ret, ==, 0);
119     g_assert_cmpint(s->drain_count, ==, 1);
120     bdrv_drain_all_end();
121     g_assert_cmpint(s->drain_count, ==, 0);
122
123     bdrv_unref(bs);
124     blk_unref(blk);
125 }
126
127 int main(int argc, char **argv)
128 {
129     bdrv_init();
130     qemu_init_main_loop(&error_abort);
131
132     g_test_init(&argc, &argv, NULL);
133
134     g_test_add_func("/bdrv-drain/driver-cb/drain_all", test_drv_cb_drain_all);
135
136     return g_test_run();
137 }
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