summaryrefslogtreecommitdiff
path: root/tests/virtio-9p-test.c
blob: a2b31085f6d857762058622d5ab63b442e6c1be9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
/*
 * QTest testcase for VirtIO 9P
 *
 * Copyright (c) 2014 SUSE LINUX Products GmbH
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */

#include "qemu/osdep.h"
#include "libqtest.h"
#include "qemu-common.h"
#include "libqos/libqos-pc.h"
#include "libqos/libqos-spapr.h"
#include "libqos/virtio.h"
#include "libqos/virtio-pci.h"
#include "standard-headers/linux/virtio_ids.h"
#include "standard-headers/linux/virtio_pci.h"
#include "hw/9pfs/9p.h"
#include "hw/9pfs/9p-synth.h"

#define QVIRTIO_9P_TIMEOUT_US (10 * 1000 * 1000)

static const char mount_tag[] = "qtest";

typedef struct {
    QVirtioDevice *dev;
    QOSState *qs;
    QVirtQueue *vq;
} QVirtIO9P;

static QVirtIO9P *qvirtio_9p_start(const char *driver)
{
    const char *arch = qtest_get_arch();
    const char *cmd = "-fsdev synth,id=fsdev0 "
                      "-device %s,fsdev=fsdev0,mount_tag=%s";
    QVirtIO9P *v9p = g_new0(QVirtIO9P, 1);

    if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
        v9p->qs = qtest_pc_boot(cmd, driver, mount_tag);
    } else if (strcmp(arch, "ppc64") == 0) {
        v9p->qs = qtest_spapr_boot(cmd, driver, mount_tag);
    } else {
        g_printerr("virtio-9p tests are only available on x86 or ppc64\n");
        exit(EXIT_FAILURE);
    }
    global_qtest = v9p->qs->qts;

    return v9p;
}

static void qvirtio_9p_stop(QVirtIO9P *v9p)
{
    qtest_shutdown(v9p->qs);
    g_free(v9p);
}

static QVirtIO9P *qvirtio_9p_pci_start(void)
{
    QVirtIO9P *v9p = qvirtio_9p_start("virtio-9p-pci");
    QVirtioPCIDevice *dev = qvirtio_pci_device_find(v9p->qs->pcibus,
                                                    VIRTIO_ID_9P);
    g_assert_nonnull(dev);
    g_assert_cmphex(dev->vdev.device_type, ==, VIRTIO_ID_9P);
    v9p->dev = (QVirtioDevice *) dev;

    qvirtio_pci_device_enable(dev);
    qvirtio_reset(v9p->dev);
    qvirtio_set_acknowledge(v9p->dev);
    qvirtio_set_driver(v9p->dev);

    v9p->vq = qvirtqueue_setup(v9p->dev, v9p->qs->alloc, 0);

    qvirtio_set_driver_ok(v9p->dev);

    return v9p;
}

static void qvirtio_9p_pci_stop(QVirtIO9P *v9p)
{
    qvirtqueue_cleanup(v9p->dev->bus, v9p->vq, v9p->qs->alloc);
    qvirtio_pci_device_disable(container_of(v9p->dev, QVirtioPCIDevice, vdev));
    qvirtio_pci_device_free((QVirtioPCIDevice *)v9p->dev);
    qvirtio_9p_stop(v9p);
}

static void pci_config(QVirtIO9P *v9p)
{
    size_t tag_len = qvirtio_config_readw(v9p->dev, 0);
    char *tag;
    int i;

    g_assert_cmpint(tag_len, ==, strlen(mount_tag));

    tag = g_malloc(tag_len);
    for (i = 0; i < tag_len; i++) {
        tag[i] = qvirtio_config_readb(v9p->dev, i + 2);
    }
    g_assert_cmpmem(tag, tag_len, mount_tag, tag_len);
    g_free(tag);
}

#define P9_MAX_SIZE 4096 /* Max size of a T-message or R-message */

typedef struct {
    QVirtIO9P *v9p;
    uint16_t tag;
    uint64_t t_msg;
    uint32_t t_size;
    uint64_t r_msg;
    /* No r_size, it is hardcoded to P9_MAX_SIZE */
    size_t t_off;
    size_t r_off;
    uint32_t free_head;
} P9Req;

static void v9fs_memwrite(P9Req *req, const void *addr, size_t len)
{
    memwrite(req->t_msg + req->t_off, addr, len);
    req->t_off += len;
}

static void v9fs_memskip(P9Req *req, size_t len)
{
    req->r_off += len;
}

static void v9fs_memread(P9Req *req, void *addr, size_t len)
{
    memread(req->r_msg + req->r_off, addr, len);
    req->r_off += len;
}

static void v9fs_uint16_write(P9Req *req, uint16_t val)
{
    uint16_t le_val = cpu_to_le16(val);

    v9fs_memwrite(req, &le_val, 2);
}

static void v9fs_uint16_read(P9Req *req, uint16_t *val)
{
    v9fs_memread(req, val, 2);
    le16_to_cpus(val);
}

static void v9fs_uint32_write(P9Req *req, uint32_t val)
{
    uint32_t le_val = cpu_to_le32(val);

    v9fs_memwrite(req, &le_val, 4);
}

static void v9fs_uint64_write(P9Req *req, uint64_t val)
{
    uint64_t le_val = cpu_to_le64(val);

    v9fs_memwrite(req, &le_val, 8);
}

static void v9fs_uint32_read(P9Req *req, uint32_t *val)
{
    v9fs_memread(req, val, 4);
    le32_to_cpus(val);
}

/* len[2] string[len] */
static uint16_t v9fs_string_size(const char *string)
{
    size_t len = strlen(string);

    g_assert_cmpint(len, <=, UINT16_MAX - 2);

    return 2 + len;
}

static void v9fs_string_write(P9Req *req, const char *string)
{
    int len = strlen(string);

    g_assert_cmpint(len, <=, UINT16_MAX);

    v9fs_uint16_write(req, (uint16_t) len);
    v9fs_memwrite(req, string, len);
}

static void v9fs_string_read(P9Req *req, uint16_t *len, char **string)
{
    uint16_t local_len;

    v9fs_uint16_read(req, &local_len);
    if (len) {
        *len = local_len;
    }
    if (string) {
        *string = g_malloc(local_len);
        v9fs_memread(req, *string, local_len);
    } else {
        v9fs_memskip(req, local_len);
    }
}

 typedef struct {
    uint32_t size;
    uint8_t id;
    uint16_t tag;
} QEMU_PACKED P9Hdr;

static P9Req *v9fs_req_init(QVirtIO9P *v9p, uint32_t size, uint8_t id,
                            uint16_t tag)
{
    P9Req *req = g_new0(P9Req, 1);
    uint32_t total_size = 7; /* 9P header has well-known size of 7 bytes */
    P9Hdr hdr = {
        .id = id,
        .tag = cpu_to_le16(tag)
    };

    g_assert_cmpint(total_size, <=, UINT32_MAX - size);
    total_size += size;
    hdr.size = cpu_to_le32(total_size);

    g_assert_cmpint(total_size, <=, P9_MAX_SIZE);

    req->v9p = v9p;
    req->t_size = total_size;
    req->t_msg = guest_alloc(v9p->qs->alloc, req->t_size);
    v9fs_memwrite(req, &hdr, 7);
    req->tag = tag;
    return req;
}

static void v9fs_req_send(P9Req *req)
{
    QVirtIO9P *v9p = req->v9p;

    req->r_msg = guest_alloc(v9p->qs->alloc, P9_MAX_SIZE);
    req->free_head = qvirtqueue_add(v9p->vq, req->t_msg, req->t_size, false,
                                    true);
    qvirtqueue_add(v9p->vq, req->r_msg, P9_MAX_SIZE, true, false);
    qvirtqueue_kick(v9p->dev, v9p->vq, req->free_head);
    req->t_off = 0;
}

static const char *rmessage_name(uint8_t id)
{
    return
        id == P9_RLERROR ? "RLERROR" :
        id == P9_RVERSION ? "RVERSION" :
        id == P9_RATTACH ? "RATTACH" :
        id == P9_RWALK ? "RWALK" :
        id == P9_RLOPEN ? "RLOPEN" :
        id == P9_RWRITE ? "RWRITE" :
        id == P9_RFLUSH ? "RFLUSH" :
        "<unknown>";
}

static void v9fs_req_wait_for_reply(P9Req *req, uint32_t *len)
{
    QVirtIO9P *v9p = req->v9p;

    qvirtio_wait_used_elem(v9p->dev, v9p->vq, req->free_head, len,
                           QVIRTIO_9P_TIMEOUT_US);
}

static void v9fs_req_recv(P9Req *req, uint8_t id)
{
    P9Hdr hdr;

    v9fs_memread(req, &hdr, 7);
    hdr.size = ldl_le_p(&hdr.size);
    hdr.tag = lduw_le_p(&hdr.tag);

    g_assert_cmpint(hdr.size, >=, 7);
    g_assert_cmpint(hdr.size, <=, P9_MAX_SIZE);
    g_assert_cmpint(hdr.tag, ==, req->tag);

    if (hdr.id != id) {
        g_printerr("Received response %d (%s) instead of %d (%s)\n",
                   hdr.id, rmessage_name(hdr.id), id, rmessage_name(id));

        if (hdr.id == P9_RLERROR) {
            uint32_t err;
            v9fs_uint32_read(req, &err);
            g_printerr("Rlerror has errno %d (%s)\n", err, strerror(err));
        }
    }
    g_assert_cmpint(hdr.id, ==, id);
}

static void v9fs_req_free(P9Req *req)
{
    QVirtIO9P *v9p = req->v9p;

    guest_free(v9p->qs->alloc, req->t_msg);
    guest_free(v9p->qs->alloc, req->r_msg);
    g_free(req);
}

/* size[4] Rlerror tag[2] ecode[4] */
static void v9fs_rlerror(P9Req *req, uint32_t *err)
{
    v9fs_req_recv(req, P9_RLERROR);
    v9fs_uint32_read(req, err);
    v9fs_req_free(req);
}

/* size[4] Tversion tag[2] msize[4] version[s] */
static P9Req *v9fs_tversion(QVirtIO9P *v9p, uint32_t msize, const char *version,
                            uint16_t tag)
{
    P9Req *req;
    uint32_t body_size = 4;
    uint16_t string_size = v9fs_string_size(version);

    g_assert_cmpint(body_size, <=, UINT32_MAX - string_size);
    body_size += string_size;
    req = v9fs_req_init(v9p, body_size, P9_TVERSION, tag);

    v9fs_uint32_write(req, msize);
    v9fs_string_write(req, version);
    v9fs_req_send(req);
    return req;
}

/* size[4] Rversion tag[2] msize[4] version[s] */
static void v9fs_rversion(P9Req *req, uint16_t *len, char **version)
{
    uint32_t msize;

    v9fs_req_recv(req, P9_RVERSION);
    v9fs_uint32_read(req, &msize);

    g_assert_cmpint(msize, ==, P9_MAX_SIZE);

    if (len || version) {
        v9fs_string_read(req, len, version);
    }

    v9fs_req_free(req);
}

/* size[4] Tattach tag[2] fid[4] afid[4] uname[s] aname[s] n_uname[4] */
static P9Req *v9fs_tattach(QVirtIO9P *v9p, uint32_t fid, uint32_t n_uname,
                           uint16_t tag)
{
    const char *uname = ""; /* ignored by QEMU */
    const char *aname = ""; /* ignored by QEMU */
    P9Req *req = v9fs_req_init(v9p, 4 + 4 + 2 + 2 + 4, P9_TATTACH, tag);

    v9fs_uint32_write(req, fid);
    v9fs_uint32_write(req, P9_NOFID);
    v9fs_string_write(req, uname);
    v9fs_string_write(req, aname);
    v9fs_uint32_write(req, n_uname);
    v9fs_req_send(req);
    return req;
}

typedef char v9fs_qid[13];

/* size[4] Rattach tag[2] qid[13] */
static void v9fs_rattach(P9Req *req, v9fs_qid *qid)
{
    v9fs_req_recv(req, P9_RATTACH);
    if (qid) {
        v9fs_memread(req, qid, 13);
    }
    v9fs_req_free(req);
}

/* size[4] Twalk tag[2] fid[4] newfid[4] nwname[2] nwname*(wname[s]) */
static P9Req *v9fs_twalk(QVirtIO9P *v9p, uint32_t fid, uint32_t newfid,
                         uint16_t nwname, char *const wnames[], uint16_t tag)
{
    P9Req *req;
    int i;
    uint32_t body_size = 4 + 4 + 2;

    for (i = 0; i < nwname; i++) {
        uint16_t wname_size = v9fs_string_size(wnames[i]);

        g_assert_cmpint(body_size, <=, UINT32_MAX - wname_size);
        body_size += wname_size;
    }
    req = v9fs_req_init(v9p,  body_size, P9_TWALK, tag);
    v9fs_uint32_write(req, fid);
    v9fs_uint32_write(req, newfid);
    v9fs_uint16_write(req, nwname);
    for (i = 0; i < nwname; i++) {
        v9fs_string_write(req, wnames[i]);
    }
    v9fs_req_send(req);
    return req;
}

/* size[4] Rwalk tag[2] nwqid[2] nwqid*(wqid[13]) */
static void v9fs_rwalk(P9Req *req, uint16_t *nwqid, v9fs_qid **wqid)
{
    uint16_t local_nwqid;

    v9fs_req_recv(req, P9_RWALK);
    v9fs_uint16_read(req, &local_nwqid);
    if (nwqid) {
        *nwqid = local_nwqid;
    }
    if (wqid) {
        *wqid = g_malloc(local_nwqid * 13);
        v9fs_memread(req, *wqid, local_nwqid * 13);
    }
    v9fs_req_free(req);
}

/* size[4] Tlopen tag[2] fid[4] flags[4] */
static P9Req *v9fs_tlopen(QVirtIO9P *v9p, uint32_t fid, uint32_t flags,
                          uint16_t tag)
{
    P9Req *req;

    req = v9fs_req_init(v9p,  4 + 4, P9_TLOPEN, tag);
    v9fs_uint32_write(req, fid);
    v9fs_uint32_write(req, flags);
    v9fs_req_send(req);
    return req;
}

/* size[4] Rlopen tag[2] qid[13] iounit[4] */
static void v9fs_rlopen(P9Req *req, v9fs_qid *qid, uint32_t *iounit)
{
    v9fs_req_recv(req, P9_RLOPEN);
    if (qid) {
        v9fs_memread(req, qid, 13);
    } else {
        v9fs_memskip(req, 13);
    }
    if (iounit) {
        v9fs_uint32_read(req, iounit);
    }
    v9fs_req_free(req);
}

/* size[4] Twrite tag[2] fid[4] offset[8] count[4] data[count] */
static P9Req *v9fs_twrite(QVirtIO9P *v9p, uint32_t fid, uint64_t offset,
                          uint32_t count, const void *data, uint16_t tag)
{
    P9Req *req;
    uint32_t body_size = 4 + 8 + 4;

    g_assert_cmpint(body_size, <=, UINT32_MAX - count);
    body_size += count;
    req = v9fs_req_init(v9p,  body_size, P9_TWRITE, tag);
    v9fs_uint32_write(req, fid);
    v9fs_uint64_write(req, offset);
    v9fs_uint32_write(req, count);
    v9fs_memwrite(req, data, count);
    v9fs_req_send(req);
    return req;
}

/* size[4] Rwrite tag[2] count[4] */
static void v9fs_rwrite(P9Req *req, uint32_t *count)
{
    v9fs_req_recv(req, P9_RWRITE);
    if (count) {
        v9fs_uint32_read(req, count);
    }
    v9fs_req_free(req);
}

/* size[4] Tflush tag[2] oldtag[2] */
static P9Req *v9fs_tflush(QVirtIO9P *v9p, uint16_t oldtag, uint16_t tag)
{
    P9Req *req;

    req = v9fs_req_init(v9p,  2, P9_TFLUSH, tag);
    v9fs_uint32_write(req, oldtag);
    v9fs_req_send(req);
    return req;
}

/* size[4] Rflush tag[2] */
static void v9fs_rflush(P9Req *req)
{
    v9fs_req_recv(req, P9_RFLUSH);
    v9fs_req_free(req);
}

static void fs_version(QVirtIO9P *v9p)
{
    const char *version = "9P2000.L";
    uint16_t server_len;
    char *server_version;
    P9Req *req;

    req = v9fs_tversion(v9p, P9_MAX_SIZE, version, P9_NOTAG);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rversion(req, &server_len, &server_version);

    g_assert_cmpmem(server_version, server_len, version, strlen(version));

    g_free(server_version);
}

static void fs_attach(QVirtIO9P *v9p)
{
    P9Req *req;

    fs_version(v9p);
    req = v9fs_tattach(v9p, 0, getuid(), 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rattach(req, NULL);
}

static void fs_walk(QVirtIO9P *v9p)
{
    char *wnames[P9_MAXWELEM];
    uint16_t nwqid;
    v9fs_qid *wqid;
    int i;
    P9Req *req;

    for (i = 0; i < P9_MAXWELEM; i++) {
        wnames[i] = g_strdup_printf(QTEST_V9FS_SYNTH_WALK_FILE, i);
    }

    fs_attach(v9p);
    req = v9fs_twalk(v9p, 0, 1, P9_MAXWELEM, wnames, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rwalk(req, &nwqid, &wqid);

    g_assert_cmpint(nwqid, ==, P9_MAXWELEM);

    for (i = 0; i < P9_MAXWELEM; i++) {
        g_free(wnames[i]);
    }

    g_free(wqid);
}

static void fs_walk_no_slash(QVirtIO9P *v9p)
{
    char *const wnames[] = { g_strdup(" /") };
    P9Req *req;
    uint32_t err;

    fs_attach(v9p);
    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rlerror(req, &err);

    g_assert_cmpint(err, ==, ENOENT);

    g_free(wnames[0]);
}

static void fs_walk_dotdot(QVirtIO9P *v9p)
{
    char *const wnames[] = { g_strdup("..") };
    v9fs_qid root_qid, *wqid;
    P9Req *req;

    fs_version(v9p);
    req = v9fs_tattach(v9p, 0, getuid(), 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rattach(req, &root_qid);

    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rwalk(req, NULL, &wqid); /* We now we'll get one qid */

    g_assert_cmpmem(&root_qid, 13, wqid[0], 13);

    g_free(wqid);
    g_free(wnames[0]);
}

static void fs_lopen(QVirtIO9P *v9p)
{
    char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_LOPEN_FILE) };
    P9Req *req;

    fs_attach(v9p);
    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rwalk(req, NULL, NULL);

    req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rlopen(req, NULL, NULL);

    g_free(wnames[0]);
}

static void fs_write(QVirtIO9P *v9p)
{
    static const uint32_t write_count = P9_MAX_SIZE / 2;
    char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_WRITE_FILE) };
    char *buf = g_malloc0(write_count);
    uint32_t count;
    P9Req *req;

    fs_attach(v9p);
    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rwalk(req, NULL, NULL);

    req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rlopen(req, NULL, NULL);

    req = v9fs_twrite(v9p, 1, 0, write_count, buf, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rwrite(req, &count);
    g_assert_cmpint(count, ==, write_count);

    g_free(buf);
    g_free(wnames[0]);
}

static void fs_flush_success(QVirtIO9P *v9p)
{
    char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_FLUSH_FILE) };
    P9Req *req, *flush_req;
    uint32_t reply_len;
    uint8_t should_block;

    fs_attach(v9p);
    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rwalk(req, NULL, NULL);

    req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rlopen(req, NULL, NULL);

    /* This will cause the 9p server to try to write data to the backend,
     * until the write request gets cancelled.
     */
    should_block = 1;
    req = v9fs_twrite(v9p, 1, 0, sizeof(should_block), &should_block, 0);

    flush_req = v9fs_tflush(v9p, req->tag, 1);

    /* The write request is supposed to be flushed: the server should just
     * mark the write request as used and reply to the flush request.
     */
    v9fs_req_wait_for_reply(req, &reply_len);
    g_assert_cmpint(reply_len, ==, 0);
    v9fs_req_free(req);
    v9fs_rflush(flush_req);

    g_free(wnames[0]);
}

static void fs_flush_ignored(QVirtIO9P *v9p)
{
    char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_FLUSH_FILE) };
    P9Req *req, *flush_req;
    uint32_t count;
    uint8_t should_block;

    fs_attach(v9p);
    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rwalk(req, NULL, NULL);

    req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rlopen(req, NULL, NULL);

    /* This will cause the write request to complete right away, before it
     * could be actually cancelled.
     */
    should_block = 0;
    req = v9fs_twrite(v9p, 1, 0, sizeof(should_block), &should_block, 0);

    flush_req = v9fs_tflush(v9p, req->tag, 1);

    /* The write request is supposed to complete. The server should
     * reply to the write request and the flush request.
     */
    v9fs_req_wait_for_reply(req, NULL);
    v9fs_rwrite(req, &count);
    g_assert_cmpint(count, ==, sizeof(should_block));
    v9fs_rflush(flush_req);

    g_free(wnames[0]);
}

typedef void (*v9fs_test_fn)(QVirtIO9P *v9p);

static void v9fs_run_pci_test(gconstpointer data)
{
    v9fs_test_fn fn = data;
    QVirtIO9P *v9p = qvirtio_9p_pci_start();

    if (fn) {
        fn(v9p);
    }
    qvirtio_9p_pci_stop(v9p);
}

static void v9fs_qtest_pci_add(const char *path, v9fs_test_fn fn)
{
    qtest_add_data_func(path, fn, v9fs_run_pci_test);
}

int main(int argc, char **argv)
{
    g_test_init(&argc, &argv, NULL);
    v9fs_qtest_pci_add("/virtio/9p/pci/nop", NULL);
    v9fs_qtest_pci_add("/virtio/9p/pci/config", pci_config);
    v9fs_qtest_pci_add("/virtio/9p/pci/fs/version/basic", fs_version);
    v9fs_qtest_pci_add("/virtio/9p/pci/fs/attach/basic", fs_attach);
    v9fs_qtest_pci_add("/virtio/9p/pci/fs/walk/basic", fs_walk);
    v9fs_qtest_pci_add("/virtio/9p/pci/fs/walk/no_slash", fs_walk_no_slash);
    v9fs_qtest_pci_add("/virtio/9p/pci/fs/walk/dotdot_from_root",
                       fs_walk_dotdot);
    v9fs_qtest_pci_add("/virtio/9p/pci/fs/lopen/basic", fs_lopen);
    v9fs_qtest_pci_add("/virtio/9p/pci/fs/write/basic", fs_write);
    v9fs_qtest_pci_add("/virtio/9p/pci/fs/flush/success", fs_flush_success);
    v9fs_qtest_pci_add("/virtio/9p/pci/fs/flush/ignored", fs_flush_ignored);

    return g_test_run();
}