xref: /openbmc/qemu/tests/qtest/virtio-9p-test.c (revision b7bc6b18)
1 /*
2  * QTest testcase for VirtIO 9P
3  *
4  * Copyright (c) 2014 SUSE LINUX Products GmbH
5  *
6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
7  * See the COPYING file in the top-level directory.
8  */
9 
10 /*
11  * Not so fast! You might want to read the 9p developer docs first:
12  * https://wiki.qemu.org/Documentation/9p
13  */
14 
15 #include "qemu/osdep.h"
16 #include "libqtest-single.h"
17 #include "qemu/module.h"
18 #include "hw/9pfs/9p.h"
19 #include "hw/9pfs/9p-synth.h"
20 #include "libqos/virtio-9p.h"
21 #include "libqos/qgraph.h"
22 
23 #define QVIRTIO_9P_TIMEOUT_US (10 * 1000 * 1000)
24 static QGuestAllocator *alloc;
25 
26 /*
27  * Used to auto generate new fids. Start with arbitrary high value to avoid
28  * collision with hard coded fids in basic test code.
29  */
30 static uint32_t fid_generator = 1000;
31 
32 static uint32_t genfid(void)
33 {
34     return fid_generator++;
35 }
36 
37 /**
38  * Splits the @a in string by @a delim into individual (non empty) strings
39  * and outputs them to @a out. The output array @a out is NULL terminated.
40  *
41  * Output array @a out must be freed by calling split_free().
42  *
43  * @returns number of individual elements in output array @a out (without the
44  *          final NULL terminating element)
45  */
46 static int split(const char *in, const char *delim, char ***out)
47 {
48     int n = 0, i = 0;
49     char *tmp, *p;
50 
51     tmp = g_strdup(in);
52     for (p = strtok(tmp, delim); p != NULL; p = strtok(NULL, delim)) {
53         if (strlen(p) > 0) {
54             ++n;
55         }
56     }
57     g_free(tmp);
58 
59     *out = g_new0(char *, n + 1); /* last element NULL delimiter */
60 
61     tmp = g_strdup(in);
62     for (p = strtok(tmp, delim); p != NULL; p = strtok(NULL, delim)) {
63         if (strlen(p) > 0) {
64             (*out)[i++] = g_strdup(p);
65         }
66     }
67     g_free(tmp);
68 
69     return n;
70 }
71 
72 static void split_free(char ***out)
73 {
74     int i;
75     for (i = 0; (*out)[i]; ++i) {
76         g_free((*out)[i]);
77     }
78     g_free(*out);
79     *out = NULL;
80 }
81 
82 static void pci_config(void *obj, void *data, QGuestAllocator *t_alloc)
83 {
84     QVirtio9P *v9p = obj;
85     alloc = t_alloc;
86     size_t tag_len = qvirtio_config_readw(v9p->vdev, 0);
87     char *tag;
88     int i;
89 
90     g_assert_cmpint(tag_len, ==, strlen(MOUNT_TAG));
91 
92     tag = g_malloc(tag_len);
93     for (i = 0; i < tag_len; i++) {
94         tag[i] = qvirtio_config_readb(v9p->vdev, i + 2);
95     }
96     g_assert_cmpmem(tag, tag_len, MOUNT_TAG, tag_len);
97     g_free(tag);
98 }
99 
100 #define P9_MAX_SIZE 4096 /* Max size of a T-message or R-message */
101 
102 typedef struct {
103     QTestState *qts;
104     QVirtio9P *v9p;
105     uint16_t tag;
106     uint64_t t_msg;
107     uint32_t t_size;
108     uint64_t r_msg;
109     /* No r_size, it is hardcoded to P9_MAX_SIZE */
110     size_t t_off;
111     size_t r_off;
112     uint32_t free_head;
113 } P9Req;
114 
115 static void v9fs_memwrite(P9Req *req, const void *addr, size_t len)
116 {
117     qtest_memwrite(req->qts, req->t_msg + req->t_off, addr, len);
118     req->t_off += len;
119 }
120 
121 static void v9fs_memskip(P9Req *req, size_t len)
122 {
123     req->r_off += len;
124 }
125 
126 static void v9fs_memread(P9Req *req, void *addr, size_t len)
127 {
128     qtest_memread(req->qts, req->r_msg + req->r_off, addr, len);
129     req->r_off += len;
130 }
131 
132 static void v9fs_uint8_read(P9Req *req, uint8_t *val)
133 {
134     v9fs_memread(req, val, 1);
135 }
136 
137 static void v9fs_uint16_write(P9Req *req, uint16_t val)
138 {
139     uint16_t le_val = cpu_to_le16(val);
140 
141     v9fs_memwrite(req, &le_val, 2);
142 }
143 
144 static void v9fs_uint16_read(P9Req *req, uint16_t *val)
145 {
146     v9fs_memread(req, val, 2);
147     le16_to_cpus(val);
148 }
149 
150 static void v9fs_uint32_write(P9Req *req, uint32_t val)
151 {
152     uint32_t le_val = cpu_to_le32(val);
153 
154     v9fs_memwrite(req, &le_val, 4);
155 }
156 
157 static void v9fs_uint64_write(P9Req *req, uint64_t val)
158 {
159     uint64_t le_val = cpu_to_le64(val);
160 
161     v9fs_memwrite(req, &le_val, 8);
162 }
163 
164 static void v9fs_uint32_read(P9Req *req, uint32_t *val)
165 {
166     v9fs_memread(req, val, 4);
167     le32_to_cpus(val);
168 }
169 
170 static void v9fs_uint64_read(P9Req *req, uint64_t *val)
171 {
172     v9fs_memread(req, val, 8);
173     le64_to_cpus(val);
174 }
175 
176 /* len[2] string[len] */
177 static uint16_t v9fs_string_size(const char *string)
178 {
179     size_t len = strlen(string);
180 
181     g_assert_cmpint(len, <=, UINT16_MAX - 2);
182 
183     return 2 + len;
184 }
185 
186 static void v9fs_string_write(P9Req *req, const char *string)
187 {
188     int len = strlen(string);
189 
190     g_assert_cmpint(len, <=, UINT16_MAX);
191 
192     v9fs_uint16_write(req, (uint16_t) len);
193     v9fs_memwrite(req, string, len);
194 }
195 
196 static void v9fs_string_read(P9Req *req, uint16_t *len, char **string)
197 {
198     uint16_t local_len;
199 
200     v9fs_uint16_read(req, &local_len);
201     if (len) {
202         *len = local_len;
203     }
204     if (string) {
205         *string = g_malloc(local_len + 1);
206         v9fs_memread(req, *string, local_len);
207         (*string)[local_len] = 0;
208     } else {
209         v9fs_memskip(req, local_len);
210     }
211 }
212 
213  typedef struct {
214     uint32_t size;
215     uint8_t id;
216     uint16_t tag;
217 } QEMU_PACKED P9Hdr;
218 
219 static P9Req *v9fs_req_init(QVirtio9P *v9p, uint32_t size, uint8_t id,
220                             uint16_t tag)
221 {
222     P9Req *req = g_new0(P9Req, 1);
223     uint32_t total_size = 7; /* 9P header has well-known size of 7 bytes */
224     P9Hdr hdr = {
225         .id = id,
226         .tag = cpu_to_le16(tag)
227     };
228 
229     g_assert_cmpint(total_size, <=, UINT32_MAX - size);
230     total_size += size;
231     hdr.size = cpu_to_le32(total_size);
232 
233     g_assert_cmpint(total_size, <=, P9_MAX_SIZE);
234 
235     req->qts = global_qtest;
236     req->v9p = v9p;
237     req->t_size = total_size;
238     req->t_msg = guest_alloc(alloc, req->t_size);
239     v9fs_memwrite(req, &hdr, 7);
240     req->tag = tag;
241     return req;
242 }
243 
244 static void v9fs_req_send(P9Req *req)
245 {
246     QVirtio9P *v9p = req->v9p;
247 
248     req->r_msg = guest_alloc(alloc, P9_MAX_SIZE);
249     req->free_head = qvirtqueue_add(req->qts, v9p->vq, req->t_msg, req->t_size,
250                                     false, true);
251     qvirtqueue_add(req->qts, v9p->vq, req->r_msg, P9_MAX_SIZE, true, false);
252     qvirtqueue_kick(req->qts, v9p->vdev, v9p->vq, req->free_head);
253     req->t_off = 0;
254 }
255 
256 static const char *rmessage_name(uint8_t id)
257 {
258     return
259         id == P9_RLERROR ? "RLERROR" :
260         id == P9_RVERSION ? "RVERSION" :
261         id == P9_RATTACH ? "RATTACH" :
262         id == P9_RWALK ? "RWALK" :
263         id == P9_RLOPEN ? "RLOPEN" :
264         id == P9_RWRITE ? "RWRITE" :
265         id == P9_RMKDIR ? "RMKDIR" :
266         id == P9_RLCREATE ? "RLCREATE" :
267         id == P9_RSYMLINK ? "RSYMLINK" :
268         id == P9_RLINK ? "RLINK" :
269         id == P9_RUNLINKAT ? "RUNLINKAT" :
270         id == P9_RFLUSH ? "RFLUSH" :
271         id == P9_RREADDIR ? "READDIR" :
272         "<unknown>";
273 }
274 
275 static void v9fs_req_wait_for_reply(P9Req *req, uint32_t *len)
276 {
277     QVirtio9P *v9p = req->v9p;
278 
279     qvirtio_wait_used_elem(req->qts, v9p->vdev, v9p->vq, req->free_head, len,
280                            QVIRTIO_9P_TIMEOUT_US);
281 }
282 
283 static void v9fs_req_recv(P9Req *req, uint8_t id)
284 {
285     P9Hdr hdr;
286 
287     v9fs_memread(req, &hdr, 7);
288     hdr.size = ldl_le_p(&hdr.size);
289     hdr.tag = lduw_le_p(&hdr.tag);
290 
291     g_assert_cmpint(hdr.size, >=, 7);
292     g_assert_cmpint(hdr.size, <=, P9_MAX_SIZE);
293     g_assert_cmpint(hdr.tag, ==, req->tag);
294 
295     if (hdr.id != id) {
296         g_printerr("Received response %d (%s) instead of %d (%s)\n",
297                    hdr.id, rmessage_name(hdr.id), id, rmessage_name(id));
298 
299         if (hdr.id == P9_RLERROR) {
300             uint32_t err;
301             v9fs_uint32_read(req, &err);
302             g_printerr("Rlerror has errno %d (%s)\n", err, strerror(err));
303         }
304     }
305     g_assert_cmpint(hdr.id, ==, id);
306 }
307 
308 static void v9fs_req_free(P9Req *req)
309 {
310     guest_free(alloc, req->t_msg);
311     guest_free(alloc, req->r_msg);
312     g_free(req);
313 }
314 
315 /* size[4] Rlerror tag[2] ecode[4] */
316 static void v9fs_rlerror(P9Req *req, uint32_t *err)
317 {
318     v9fs_req_recv(req, P9_RLERROR);
319     v9fs_uint32_read(req, err);
320     v9fs_req_free(req);
321 }
322 
323 /* size[4] Tversion tag[2] msize[4] version[s] */
324 static P9Req *v9fs_tversion(QVirtio9P *v9p, uint32_t msize, const char *version,
325                             uint16_t tag)
326 {
327     P9Req *req;
328     uint32_t body_size = 4;
329     uint16_t string_size = v9fs_string_size(version);
330 
331     g_assert_cmpint(body_size, <=, UINT32_MAX - string_size);
332     body_size += string_size;
333     req = v9fs_req_init(v9p, body_size, P9_TVERSION, tag);
334 
335     v9fs_uint32_write(req, msize);
336     v9fs_string_write(req, version);
337     v9fs_req_send(req);
338     return req;
339 }
340 
341 /* size[4] Rversion tag[2] msize[4] version[s] */
342 static void v9fs_rversion(P9Req *req, uint16_t *len, char **version)
343 {
344     uint32_t msize;
345 
346     v9fs_req_recv(req, P9_RVERSION);
347     v9fs_uint32_read(req, &msize);
348 
349     g_assert_cmpint(msize, ==, P9_MAX_SIZE);
350 
351     if (len || version) {
352         v9fs_string_read(req, len, version);
353     }
354 
355     v9fs_req_free(req);
356 }
357 
358 /* size[4] Tattach tag[2] fid[4] afid[4] uname[s] aname[s] n_uname[4] */
359 static P9Req *v9fs_tattach(QVirtio9P *v9p, uint32_t fid, uint32_t n_uname,
360                            uint16_t tag)
361 {
362     const char *uname = ""; /* ignored by QEMU */
363     const char *aname = ""; /* ignored by QEMU */
364     P9Req *req = v9fs_req_init(v9p, 4 + 4 + 2 + 2 + 4, P9_TATTACH, tag);
365 
366     v9fs_uint32_write(req, fid);
367     v9fs_uint32_write(req, P9_NOFID);
368     v9fs_string_write(req, uname);
369     v9fs_string_write(req, aname);
370     v9fs_uint32_write(req, n_uname);
371     v9fs_req_send(req);
372     return req;
373 }
374 
375 typedef char v9fs_qid[13];
376 
377 /* size[4] Rattach tag[2] qid[13] */
378 static void v9fs_rattach(P9Req *req, v9fs_qid *qid)
379 {
380     v9fs_req_recv(req, P9_RATTACH);
381     if (qid) {
382         v9fs_memread(req, qid, 13);
383     }
384     v9fs_req_free(req);
385 }
386 
387 /* size[4] Twalk tag[2] fid[4] newfid[4] nwname[2] nwname*(wname[s]) */
388 static P9Req *v9fs_twalk(QVirtio9P *v9p, uint32_t fid, uint32_t newfid,
389                          uint16_t nwname, char *const wnames[], uint16_t tag)
390 {
391     P9Req *req;
392     int i;
393     uint32_t body_size = 4 + 4 + 2;
394 
395     for (i = 0; i < nwname; i++) {
396         uint16_t wname_size = v9fs_string_size(wnames[i]);
397 
398         g_assert_cmpint(body_size, <=, UINT32_MAX - wname_size);
399         body_size += wname_size;
400     }
401     req = v9fs_req_init(v9p,  body_size, P9_TWALK, tag);
402     v9fs_uint32_write(req, fid);
403     v9fs_uint32_write(req, newfid);
404     v9fs_uint16_write(req, nwname);
405     for (i = 0; i < nwname; i++) {
406         v9fs_string_write(req, wnames[i]);
407     }
408     v9fs_req_send(req);
409     return req;
410 }
411 
412 /* size[4] Rwalk tag[2] nwqid[2] nwqid*(wqid[13]) */
413 static void v9fs_rwalk(P9Req *req, uint16_t *nwqid, v9fs_qid **wqid)
414 {
415     uint16_t local_nwqid;
416 
417     v9fs_req_recv(req, P9_RWALK);
418     v9fs_uint16_read(req, &local_nwqid);
419     if (nwqid) {
420         *nwqid = local_nwqid;
421     }
422     if (wqid) {
423         *wqid = g_malloc(local_nwqid * 13);
424         v9fs_memread(req, *wqid, local_nwqid * 13);
425     }
426     v9fs_req_free(req);
427 }
428 
429 /* size[4] Treaddir tag[2] fid[4] offset[8] count[4] */
430 static P9Req *v9fs_treaddir(QVirtio9P *v9p, uint32_t fid, uint64_t offset,
431                             uint32_t count, uint16_t tag)
432 {
433     P9Req *req;
434 
435     req = v9fs_req_init(v9p, 4 + 8 + 4, P9_TREADDIR, tag);
436     v9fs_uint32_write(req, fid);
437     v9fs_uint64_write(req, offset);
438     v9fs_uint32_write(req, count);
439     v9fs_req_send(req);
440     return req;
441 }
442 
443 struct V9fsDirent {
444     v9fs_qid qid;
445     uint64_t offset;
446     uint8_t type;
447     char *name;
448     struct V9fsDirent *next;
449 };
450 
451 /* size[4] Rreaddir tag[2] count[4] data[count] */
452 static void v9fs_rreaddir(P9Req *req, uint32_t *count, uint32_t *nentries,
453                           struct V9fsDirent **entries)
454 {
455     uint32_t local_count;
456     struct V9fsDirent *e = NULL;
457     uint16_t slen;
458     uint32_t n = 0;
459 
460     v9fs_req_recv(req, P9_RREADDIR);
461     v9fs_uint32_read(req, &local_count);
462 
463     if (count) {
464         *count = local_count;
465     }
466 
467     for (int32_t togo = (int32_t)local_count;
468          togo >= 13 + 8 + 1 + 2;
469          togo -= 13 + 8 + 1 + 2 + slen, ++n)
470     {
471         if (!e) {
472             e = g_malloc(sizeof(struct V9fsDirent));
473             if (entries) {
474                 *entries = e;
475             }
476         } else {
477             e = e->next = g_malloc(sizeof(struct V9fsDirent));
478         }
479         e->next = NULL;
480         /* qid[13] offset[8] type[1] name[s] */
481         v9fs_memread(req, &e->qid, 13);
482         v9fs_uint64_read(req, &e->offset);
483         v9fs_uint8_read(req, &e->type);
484         v9fs_string_read(req, &slen, &e->name);
485     }
486 
487     if (nentries) {
488         *nentries = n;
489     }
490 
491     v9fs_req_free(req);
492 }
493 
494 static void v9fs_free_dirents(struct V9fsDirent *e)
495 {
496     struct V9fsDirent *next = NULL;
497 
498     for (; e; e = next) {
499         next = e->next;
500         g_free(e->name);
501         g_free(e);
502     }
503 }
504 
505 /* size[4] Tlopen tag[2] fid[4] flags[4] */
506 static P9Req *v9fs_tlopen(QVirtio9P *v9p, uint32_t fid, uint32_t flags,
507                           uint16_t tag)
508 {
509     P9Req *req;
510 
511     req = v9fs_req_init(v9p,  4 + 4, P9_TLOPEN, tag);
512     v9fs_uint32_write(req, fid);
513     v9fs_uint32_write(req, flags);
514     v9fs_req_send(req);
515     return req;
516 }
517 
518 /* size[4] Rlopen tag[2] qid[13] iounit[4] */
519 static void v9fs_rlopen(P9Req *req, v9fs_qid *qid, uint32_t *iounit)
520 {
521     v9fs_req_recv(req, P9_RLOPEN);
522     if (qid) {
523         v9fs_memread(req, qid, 13);
524     } else {
525         v9fs_memskip(req, 13);
526     }
527     if (iounit) {
528         v9fs_uint32_read(req, iounit);
529     }
530     v9fs_req_free(req);
531 }
532 
533 /* size[4] Twrite tag[2] fid[4] offset[8] count[4] data[count] */
534 static P9Req *v9fs_twrite(QVirtio9P *v9p, uint32_t fid, uint64_t offset,
535                           uint32_t count, const void *data, uint16_t tag)
536 {
537     P9Req *req;
538     uint32_t body_size = 4 + 8 + 4;
539 
540     g_assert_cmpint(body_size, <=, UINT32_MAX - count);
541     body_size += count;
542     req = v9fs_req_init(v9p,  body_size, P9_TWRITE, tag);
543     v9fs_uint32_write(req, fid);
544     v9fs_uint64_write(req, offset);
545     v9fs_uint32_write(req, count);
546     v9fs_memwrite(req, data, count);
547     v9fs_req_send(req);
548     return req;
549 }
550 
551 /* size[4] Rwrite tag[2] count[4] */
552 static void v9fs_rwrite(P9Req *req, uint32_t *count)
553 {
554     v9fs_req_recv(req, P9_RWRITE);
555     if (count) {
556         v9fs_uint32_read(req, count);
557     }
558     v9fs_req_free(req);
559 }
560 
561 /* size[4] Tflush tag[2] oldtag[2] */
562 static P9Req *v9fs_tflush(QVirtio9P *v9p, uint16_t oldtag, uint16_t tag)
563 {
564     P9Req *req;
565 
566     req = v9fs_req_init(v9p,  2, P9_TFLUSH, tag);
567     v9fs_uint32_write(req, oldtag);
568     v9fs_req_send(req);
569     return req;
570 }
571 
572 /* size[4] Rflush tag[2] */
573 static void v9fs_rflush(P9Req *req)
574 {
575     v9fs_req_recv(req, P9_RFLUSH);
576     v9fs_req_free(req);
577 }
578 
579 static void do_version(QVirtio9P *v9p)
580 {
581     const char *version = "9P2000.L";
582     uint16_t server_len;
583     char *server_version;
584     P9Req *req;
585 
586     req = v9fs_tversion(v9p, P9_MAX_SIZE, version, P9_NOTAG);
587     v9fs_req_wait_for_reply(req, NULL);
588     v9fs_rversion(req, &server_len, &server_version);
589 
590     g_assert_cmpmem(server_version, server_len, version, strlen(version));
591 
592     g_free(server_version);
593 }
594 
595 /* utility function: walk to requested dir and return fid for that dir */
596 static uint32_t do_walk(QVirtio9P *v9p, const char *path)
597 {
598     char **wnames;
599     P9Req *req;
600     const uint32_t fid = genfid();
601 
602     int nwnames = split(path, "/", &wnames);
603 
604     req = v9fs_twalk(v9p, 0, fid, nwnames, wnames, 0);
605     v9fs_req_wait_for_reply(req, NULL);
606     v9fs_rwalk(req, NULL, NULL);
607 
608     split_free(&wnames);
609     return fid;
610 }
611 
612 static void fs_version(void *obj, void *data, QGuestAllocator *t_alloc)
613 {
614     alloc = t_alloc;
615     do_version(obj);
616 }
617 
618 static void do_attach(QVirtio9P *v9p)
619 {
620     P9Req *req;
621 
622     do_version(v9p);
623     req = v9fs_tattach(v9p, 0, getuid(), 0);
624     v9fs_req_wait_for_reply(req, NULL);
625     v9fs_rattach(req, NULL);
626 }
627 
628 static void fs_attach(void *obj, void *data, QGuestAllocator *t_alloc)
629 {
630     alloc = t_alloc;
631     do_attach(obj);
632 }
633 
634 static void fs_walk(void *obj, void *data, QGuestAllocator *t_alloc)
635 {
636     QVirtio9P *v9p = obj;
637     alloc = t_alloc;
638     char *wnames[P9_MAXWELEM];
639     uint16_t nwqid;
640     v9fs_qid *wqid;
641     int i;
642     P9Req *req;
643 
644     for (i = 0; i < P9_MAXWELEM; i++) {
645         wnames[i] = g_strdup_printf(QTEST_V9FS_SYNTH_WALK_FILE, i);
646     }
647 
648     do_attach(v9p);
649     req = v9fs_twalk(v9p, 0, 1, P9_MAXWELEM, wnames, 0);
650     v9fs_req_wait_for_reply(req, NULL);
651     v9fs_rwalk(req, &nwqid, &wqid);
652 
653     g_assert_cmpint(nwqid, ==, P9_MAXWELEM);
654 
655     for (i = 0; i < P9_MAXWELEM; i++) {
656         g_free(wnames[i]);
657     }
658 
659     g_free(wqid);
660 }
661 
662 static bool fs_dirents_contain_name(struct V9fsDirent *e, const char* name)
663 {
664     for (; e; e = e->next) {
665         if (!strcmp(e->name, name)) {
666             return true;
667         }
668     }
669     return false;
670 }
671 
672 /* size[4] Tmkdir tag[2] dfid[4] name[s] mode[4] gid[4] */
673 static P9Req *v9fs_tmkdir(QVirtio9P *v9p, uint32_t dfid, const char *name,
674                           uint32_t mode, uint32_t gid, uint16_t tag)
675 {
676     P9Req *req;
677 
678     uint32_t body_size = 4 + 4 + 4;
679     uint16_t string_size = v9fs_string_size(name);
680 
681     g_assert_cmpint(body_size, <=, UINT32_MAX - string_size);
682     body_size += string_size;
683 
684     req = v9fs_req_init(v9p, body_size, P9_TMKDIR, tag);
685     v9fs_uint32_write(req, dfid);
686     v9fs_string_write(req, name);
687     v9fs_uint32_write(req, mode);
688     v9fs_uint32_write(req, gid);
689     v9fs_req_send(req);
690     return req;
691 }
692 
693 /* size[4] Rmkdir tag[2] qid[13] */
694 static void v9fs_rmkdir(P9Req *req, v9fs_qid *qid)
695 {
696     v9fs_req_recv(req, P9_RMKDIR);
697     if (qid) {
698         v9fs_memread(req, qid, 13);
699     } else {
700         v9fs_memskip(req, 13);
701     }
702     v9fs_req_free(req);
703 }
704 
705 /* size[4] Tlcreate tag[2] fid[4] name[s] flags[4] mode[4] gid[4] */
706 static P9Req *v9fs_tlcreate(QVirtio9P *v9p, uint32_t fid, const char *name,
707                             uint32_t flags, uint32_t mode, uint32_t gid,
708                             uint16_t tag)
709 {
710     P9Req *req;
711 
712     uint32_t body_size = 4 + 4 + 4 + 4;
713     uint16_t string_size = v9fs_string_size(name);
714 
715     g_assert_cmpint(body_size, <=, UINT32_MAX - string_size);
716     body_size += string_size;
717 
718     req = v9fs_req_init(v9p, body_size, P9_TLCREATE, tag);
719     v9fs_uint32_write(req, fid);
720     v9fs_string_write(req, name);
721     v9fs_uint32_write(req, flags);
722     v9fs_uint32_write(req, mode);
723     v9fs_uint32_write(req, gid);
724     v9fs_req_send(req);
725     return req;
726 }
727 
728 /* size[4] Rlcreate tag[2] qid[13] iounit[4] */
729 static void v9fs_rlcreate(P9Req *req, v9fs_qid *qid, uint32_t *iounit)
730 {
731     v9fs_req_recv(req, P9_RLCREATE);
732     if (qid) {
733         v9fs_memread(req, qid, 13);
734     } else {
735         v9fs_memskip(req, 13);
736     }
737     if (iounit) {
738         v9fs_uint32_read(req, iounit);
739     }
740     v9fs_req_free(req);
741 }
742 
743 /* size[4] Tsymlink tag[2] fid[4] name[s] symtgt[s] gid[4] */
744 static P9Req *v9fs_tsymlink(QVirtio9P *v9p, uint32_t fid, const char *name,
745                             const char *symtgt, uint32_t gid, uint16_t tag)
746 {
747     P9Req *req;
748 
749     uint32_t body_size = 4 + 4;
750     uint16_t string_size = v9fs_string_size(name) + v9fs_string_size(symtgt);
751 
752     g_assert_cmpint(body_size, <=, UINT32_MAX - string_size);
753     body_size += string_size;
754 
755     req = v9fs_req_init(v9p, body_size, P9_TSYMLINK, tag);
756     v9fs_uint32_write(req, fid);
757     v9fs_string_write(req, name);
758     v9fs_string_write(req, symtgt);
759     v9fs_uint32_write(req, gid);
760     v9fs_req_send(req);
761     return req;
762 }
763 
764 /* size[4] Rsymlink tag[2] qid[13] */
765 static void v9fs_rsymlink(P9Req *req, v9fs_qid *qid)
766 {
767     v9fs_req_recv(req, P9_RSYMLINK);
768     if (qid) {
769         v9fs_memread(req, qid, 13);
770     } else {
771         v9fs_memskip(req, 13);
772     }
773     v9fs_req_free(req);
774 }
775 
776 /* size[4] Tlink tag[2] dfid[4] fid[4] name[s] */
777 static P9Req *v9fs_tlink(QVirtio9P *v9p, uint32_t dfid, uint32_t fid,
778                          const char *name, uint16_t tag)
779 {
780     P9Req *req;
781 
782     uint32_t body_size = 4 + 4;
783     uint16_t string_size = v9fs_string_size(name);
784 
785     g_assert_cmpint(body_size, <=, UINT32_MAX - string_size);
786     body_size += string_size;
787 
788     req = v9fs_req_init(v9p, body_size, P9_TLINK, tag);
789     v9fs_uint32_write(req, dfid);
790     v9fs_uint32_write(req, fid);
791     v9fs_string_write(req, name);
792     v9fs_req_send(req);
793     return req;
794 }
795 
796 /* size[4] Rlink tag[2] */
797 static void v9fs_rlink(P9Req *req)
798 {
799     v9fs_req_recv(req, P9_RLINK);
800     v9fs_req_free(req);
801 }
802 
803 /* size[4] Tunlinkat tag[2] dirfd[4] name[s] flags[4] */
804 static P9Req *v9fs_tunlinkat(QVirtio9P *v9p, uint32_t dirfd, const char *name,
805                              uint32_t flags, uint16_t tag)
806 {
807     P9Req *req;
808 
809     uint32_t body_size = 4 + 4;
810     uint16_t string_size = v9fs_string_size(name);
811 
812     g_assert_cmpint(body_size, <=, UINT32_MAX - string_size);
813     body_size += string_size;
814 
815     req = v9fs_req_init(v9p, body_size, P9_TUNLINKAT, tag);
816     v9fs_uint32_write(req, dirfd);
817     v9fs_string_write(req, name);
818     v9fs_uint32_write(req, flags);
819     v9fs_req_send(req);
820     return req;
821 }
822 
823 /* size[4] Runlinkat tag[2] */
824 static void v9fs_runlinkat(P9Req *req)
825 {
826     v9fs_req_recv(req, P9_RUNLINKAT);
827     v9fs_req_free(req);
828 }
829 
830 /* basic readdir test where reply fits into a single response message */
831 static void fs_readdir(void *obj, void *data, QGuestAllocator *t_alloc)
832 {
833     QVirtio9P *v9p = obj;
834     alloc = t_alloc;
835     char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_READDIR_DIR) };
836     uint16_t nqid;
837     v9fs_qid qid;
838     uint32_t count, nentries;
839     struct V9fsDirent *entries = NULL;
840     P9Req *req;
841 
842     do_attach(v9p);
843     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
844     v9fs_req_wait_for_reply(req, NULL);
845     v9fs_rwalk(req, &nqid, NULL);
846     g_assert_cmpint(nqid, ==, 1);
847 
848     req = v9fs_tlopen(v9p, 1, O_DIRECTORY, 0);
849     v9fs_req_wait_for_reply(req, NULL);
850     v9fs_rlopen(req, &qid, NULL);
851 
852     /*
853      * submit count = msize - 11, because 11 is the header size of Rreaddir
854      */
855     req = v9fs_treaddir(v9p, 1, 0, P9_MAX_SIZE - 11, 0);
856     v9fs_req_wait_for_reply(req, NULL);
857     v9fs_rreaddir(req, &count, &nentries, &entries);
858 
859     /*
860      * Assuming msize (P9_MAX_SIZE) is large enough so we can retrieve all
861      * dir entries with only one readdir request.
862      */
863     g_assert_cmpint(
864         nentries, ==,
865         QTEST_V9FS_SYNTH_READDIR_NFILES + 2 /* "." and ".." */
866     );
867 
868     /*
869      * Check all file names exist in returned entries, ignore their order
870      * though.
871      */
872     g_assert_cmpint(fs_dirents_contain_name(entries, "."), ==, true);
873     g_assert_cmpint(fs_dirents_contain_name(entries, ".."), ==, true);
874     for (int i = 0; i < QTEST_V9FS_SYNTH_READDIR_NFILES; ++i) {
875         char *name = g_strdup_printf(QTEST_V9FS_SYNTH_READDIR_FILE, i);
876         g_assert_cmpint(fs_dirents_contain_name(entries, name), ==, true);
877         g_free(name);
878     }
879 
880     v9fs_free_dirents(entries);
881     g_free(wnames[0]);
882 }
883 
884 /* readdir test where overall request is split over several messages */
885 static void do_readdir_split(QVirtio9P *v9p, uint32_t count)
886 {
887     char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_READDIR_DIR) };
888     uint16_t nqid;
889     v9fs_qid qid;
890     uint32_t nentries, npartialentries;
891     struct V9fsDirent *entries, *tail, *partialentries;
892     P9Req *req;
893     int fid;
894     uint64_t offset;
895 
896     do_attach(v9p);
897 
898     fid = 1;
899     offset = 0;
900     entries = NULL;
901     nentries = 0;
902     tail = NULL;
903 
904     req = v9fs_twalk(v9p, 0, fid, 1, wnames, 0);
905     v9fs_req_wait_for_reply(req, NULL);
906     v9fs_rwalk(req, &nqid, NULL);
907     g_assert_cmpint(nqid, ==, 1);
908 
909     req = v9fs_tlopen(v9p, fid, O_DIRECTORY, 0);
910     v9fs_req_wait_for_reply(req, NULL);
911     v9fs_rlopen(req, &qid, NULL);
912 
913     /*
914      * send as many Treaddir requests as required to get all directory
915      * entries
916      */
917     while (true) {
918         npartialentries = 0;
919         partialentries = NULL;
920 
921         req = v9fs_treaddir(v9p, fid, offset, count, 0);
922         v9fs_req_wait_for_reply(req, NULL);
923         v9fs_rreaddir(req, &count, &npartialentries, &partialentries);
924         if (npartialentries > 0 && partialentries) {
925             if (!entries) {
926                 entries = partialentries;
927                 nentries = npartialentries;
928                 tail = partialentries;
929             } else {
930                 tail->next = partialentries;
931                 nentries += npartialentries;
932             }
933             while (tail->next) {
934                 tail = tail->next;
935             }
936             offset = tail->offset;
937         } else {
938             break;
939         }
940     }
941 
942     g_assert_cmpint(
943         nentries, ==,
944         QTEST_V9FS_SYNTH_READDIR_NFILES + 2 /* "." and ".." */
945     );
946 
947     /*
948      * Check all file names exist in returned entries, ignore their order
949      * though.
950      */
951     g_assert_cmpint(fs_dirents_contain_name(entries, "."), ==, true);
952     g_assert_cmpint(fs_dirents_contain_name(entries, ".."), ==, true);
953     for (int i = 0; i < QTEST_V9FS_SYNTH_READDIR_NFILES; ++i) {
954         char *name = g_strdup_printf(QTEST_V9FS_SYNTH_READDIR_FILE, i);
955         g_assert_cmpint(fs_dirents_contain_name(entries, name), ==, true);
956         g_free(name);
957     }
958 
959     v9fs_free_dirents(entries);
960 
961     g_free(wnames[0]);
962 }
963 
964 static void fs_walk_no_slash(void *obj, void *data, QGuestAllocator *t_alloc)
965 {
966     QVirtio9P *v9p = obj;
967     alloc = t_alloc;
968     char *const wnames[] = { g_strdup(" /") };
969     P9Req *req;
970     uint32_t err;
971 
972     do_attach(v9p);
973     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
974     v9fs_req_wait_for_reply(req, NULL);
975     v9fs_rlerror(req, &err);
976 
977     g_assert_cmpint(err, ==, ENOENT);
978 
979     g_free(wnames[0]);
980 }
981 
982 static void fs_walk_dotdot(void *obj, void *data, QGuestAllocator *t_alloc)
983 {
984     QVirtio9P *v9p = obj;
985     alloc = t_alloc;
986     char *const wnames[] = { g_strdup("..") };
987     v9fs_qid root_qid, *wqid;
988     P9Req *req;
989 
990     do_version(v9p);
991     req = v9fs_tattach(v9p, 0, getuid(), 0);
992     v9fs_req_wait_for_reply(req, NULL);
993     v9fs_rattach(req, &root_qid);
994 
995     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
996     v9fs_req_wait_for_reply(req, NULL);
997     v9fs_rwalk(req, NULL, &wqid); /* We now we'll get one qid */
998 
999     g_assert_cmpmem(&root_qid, 13, wqid[0], 13);
1000 
1001     g_free(wqid);
1002     g_free(wnames[0]);
1003 }
1004 
1005 static void fs_lopen(void *obj, void *data, QGuestAllocator *t_alloc)
1006 {
1007     QVirtio9P *v9p = obj;
1008     alloc = t_alloc;
1009     char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_LOPEN_FILE) };
1010     P9Req *req;
1011 
1012     do_attach(v9p);
1013     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
1014     v9fs_req_wait_for_reply(req, NULL);
1015     v9fs_rwalk(req, NULL, NULL);
1016 
1017     req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
1018     v9fs_req_wait_for_reply(req, NULL);
1019     v9fs_rlopen(req, NULL, NULL);
1020 
1021     g_free(wnames[0]);
1022 }
1023 
1024 static void fs_write(void *obj, void *data, QGuestAllocator *t_alloc)
1025 {
1026     QVirtio9P *v9p = obj;
1027     alloc = t_alloc;
1028     static const uint32_t write_count = P9_MAX_SIZE / 2;
1029     char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_WRITE_FILE) };
1030     char *buf = g_malloc0(write_count);
1031     uint32_t count;
1032     P9Req *req;
1033 
1034     do_attach(v9p);
1035     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
1036     v9fs_req_wait_for_reply(req, NULL);
1037     v9fs_rwalk(req, NULL, NULL);
1038 
1039     req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
1040     v9fs_req_wait_for_reply(req, NULL);
1041     v9fs_rlopen(req, NULL, NULL);
1042 
1043     req = v9fs_twrite(v9p, 1, 0, write_count, buf, 0);
1044     v9fs_req_wait_for_reply(req, NULL);
1045     v9fs_rwrite(req, &count);
1046     g_assert_cmpint(count, ==, write_count);
1047 
1048     g_free(buf);
1049     g_free(wnames[0]);
1050 }
1051 
1052 static void fs_flush_success(void *obj, void *data, QGuestAllocator *t_alloc)
1053 {
1054     QVirtio9P *v9p = obj;
1055     alloc = t_alloc;
1056     char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_FLUSH_FILE) };
1057     P9Req *req, *flush_req;
1058     uint32_t reply_len;
1059     uint8_t should_block;
1060 
1061     do_attach(v9p);
1062     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
1063     v9fs_req_wait_for_reply(req, NULL);
1064     v9fs_rwalk(req, NULL, NULL);
1065 
1066     req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
1067     v9fs_req_wait_for_reply(req, NULL);
1068     v9fs_rlopen(req, NULL, NULL);
1069 
1070     /* This will cause the 9p server to try to write data to the backend,
1071      * until the write request gets cancelled.
1072      */
1073     should_block = 1;
1074     req = v9fs_twrite(v9p, 1, 0, sizeof(should_block), &should_block, 0);
1075 
1076     flush_req = v9fs_tflush(v9p, req->tag, 1);
1077 
1078     /* The write request is supposed to be flushed: the server should just
1079      * mark the write request as used and reply to the flush request.
1080      */
1081     v9fs_req_wait_for_reply(req, &reply_len);
1082     g_assert_cmpint(reply_len, ==, 0);
1083     v9fs_req_free(req);
1084     v9fs_rflush(flush_req);
1085 
1086     g_free(wnames[0]);
1087 }
1088 
1089 static void fs_flush_ignored(void *obj, void *data, QGuestAllocator *t_alloc)
1090 {
1091     QVirtio9P *v9p = obj;
1092     alloc = t_alloc;
1093     char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_FLUSH_FILE) };
1094     P9Req *req, *flush_req;
1095     uint32_t count;
1096     uint8_t should_block;
1097 
1098     do_attach(v9p);
1099     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
1100     v9fs_req_wait_for_reply(req, NULL);
1101     v9fs_rwalk(req, NULL, NULL);
1102 
1103     req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
1104     v9fs_req_wait_for_reply(req, NULL);
1105     v9fs_rlopen(req, NULL, NULL);
1106 
1107     /* This will cause the write request to complete right away, before it
1108      * could be actually cancelled.
1109      */
1110     should_block = 0;
1111     req = v9fs_twrite(v9p, 1, 0, sizeof(should_block), &should_block, 0);
1112 
1113     flush_req = v9fs_tflush(v9p, req->tag, 1);
1114 
1115     /* The write request is supposed to complete. The server should
1116      * reply to the write request and the flush request.
1117      */
1118     v9fs_req_wait_for_reply(req, NULL);
1119     v9fs_rwrite(req, &count);
1120     g_assert_cmpint(count, ==, sizeof(should_block));
1121     v9fs_rflush(flush_req);
1122 
1123     g_free(wnames[0]);
1124 }
1125 
1126 static void do_mkdir(QVirtio9P *v9p, const char *path, const char *cname)
1127 {
1128     char *const name = g_strdup(cname);
1129     uint32_t fid;
1130     P9Req *req;
1131 
1132     fid = do_walk(v9p, path);
1133 
1134     req = v9fs_tmkdir(v9p, fid, name, 0750, 0, 0);
1135     v9fs_req_wait_for_reply(req, NULL);
1136     v9fs_rmkdir(req, NULL);
1137 
1138     g_free(name);
1139 }
1140 
1141 /* create a regular file with Tlcreate and return file's fid */
1142 static uint32_t do_lcreate(QVirtio9P *v9p, const char *path,
1143                            const char *cname)
1144 {
1145     char *const name = g_strdup(cname);
1146     uint32_t fid;
1147     P9Req *req;
1148 
1149     fid = do_walk(v9p, path);
1150 
1151     req = v9fs_tlcreate(v9p, fid, name, 0, 0750, 0, 0);
1152     v9fs_req_wait_for_reply(req, NULL);
1153     v9fs_rlcreate(req, NULL, NULL);
1154 
1155     g_free(name);
1156     return fid;
1157 }
1158 
1159 /* create symlink named @a clink in directory @a path pointing to @a to */
1160 static void do_symlink(QVirtio9P *v9p, const char *path, const char *clink,
1161                        const char *to)
1162 {
1163     char *const name = g_strdup(clink);
1164     char *const dst = g_strdup(to);
1165     uint32_t fid;
1166     P9Req *req;
1167 
1168     fid = do_walk(v9p, path);
1169 
1170     req = v9fs_tsymlink(v9p, fid, name, dst, 0, 0);
1171     v9fs_req_wait_for_reply(req, NULL);
1172     v9fs_rsymlink(req, NULL);
1173 
1174     g_free(dst);
1175     g_free(name);
1176 }
1177 
1178 /* create a hard link named @a clink in directory @a path pointing to @a to */
1179 static void do_hardlink(QVirtio9P *v9p, const char *path, const char *clink,
1180                         const char *to)
1181 {
1182     uint32_t dfid, fid;
1183     P9Req *req;
1184 
1185     dfid = do_walk(v9p, path);
1186     fid = do_walk(v9p, to);
1187 
1188     req = v9fs_tlink(v9p, dfid, fid, clink, 0);
1189     v9fs_req_wait_for_reply(req, NULL);
1190     v9fs_rlink(req);
1191 }
1192 
1193 static void do_unlinkat(QVirtio9P *v9p, const char *atpath, const char *rpath,
1194                         uint32_t flags)
1195 {
1196     char *const name = g_strdup(rpath);
1197     uint32_t fid;
1198     P9Req *req;
1199 
1200     fid = do_walk(v9p, atpath);
1201 
1202     req = v9fs_tunlinkat(v9p, fid, name, flags, 0);
1203     v9fs_req_wait_for_reply(req, NULL);
1204     v9fs_runlinkat(req);
1205 
1206     g_free(name);
1207 }
1208 
1209 static void fs_readdir_split_128(void *obj, void *data,
1210                                  QGuestAllocator *t_alloc)
1211 {
1212     alloc = t_alloc;
1213     do_readdir_split(obj, 128);
1214 }
1215 
1216 static void fs_readdir_split_256(void *obj, void *data,
1217                                  QGuestAllocator *t_alloc)
1218 {
1219     alloc = t_alloc;
1220     do_readdir_split(obj, 256);
1221 }
1222 
1223 static void fs_readdir_split_512(void *obj, void *data,
1224                                  QGuestAllocator *t_alloc)
1225 {
1226     alloc = t_alloc;
1227     do_readdir_split(obj, 512);
1228 }
1229 
1230 
1231 /* tests using the 9pfs 'local' fs driver */
1232 
1233 static void fs_create_dir(void *obj, void *data, QGuestAllocator *t_alloc)
1234 {
1235     QVirtio9P *v9p = obj;
1236     alloc = t_alloc;
1237     struct stat st;
1238     char *root_path = virtio_9p_test_path("");
1239     char *new_dir = virtio_9p_test_path("01");
1240 
1241     g_assert(root_path != NULL);
1242 
1243     do_attach(v9p);
1244     do_mkdir(v9p, "/", "01");
1245 
1246     /* check if created directory really exists now ... */
1247     g_assert(stat(new_dir, &st) == 0);
1248     /* ... and is actually a directory */
1249     g_assert((st.st_mode & S_IFMT) == S_IFDIR);
1250 
1251     g_free(new_dir);
1252     g_free(root_path);
1253 }
1254 
1255 static void fs_unlinkat_dir(void *obj, void *data, QGuestAllocator *t_alloc)
1256 {
1257     QVirtio9P *v9p = obj;
1258     alloc = t_alloc;
1259     struct stat st;
1260     char *root_path = virtio_9p_test_path("");
1261     char *new_dir = virtio_9p_test_path("02");
1262 
1263     g_assert(root_path != NULL);
1264 
1265     do_attach(v9p);
1266     do_mkdir(v9p, "/", "02");
1267 
1268     /* check if created directory really exists now ... */
1269     g_assert(stat(new_dir, &st) == 0);
1270     /* ... and is actually a directory */
1271     g_assert((st.st_mode & S_IFMT) == S_IFDIR);
1272 
1273     do_unlinkat(v9p, "/", "02", AT_REMOVEDIR);
1274     /* directory should be gone now */
1275     g_assert(stat(new_dir, &st) != 0);
1276 
1277     g_free(new_dir);
1278     g_free(root_path);
1279 }
1280 
1281 static void fs_create_file(void *obj, void *data, QGuestAllocator *t_alloc)
1282 {
1283     QVirtio9P *v9p = obj;
1284     alloc = t_alloc;
1285     struct stat st;
1286     char *new_file = virtio_9p_test_path("03/1st_file");
1287 
1288     do_attach(v9p);
1289     do_mkdir(v9p, "/", "03");
1290     do_lcreate(v9p, "03", "1st_file");
1291 
1292     /* check if created file exists now ... */
1293     g_assert(stat(new_file, &st) == 0);
1294     /* ... and is a regular file */
1295     g_assert((st.st_mode & S_IFMT) == S_IFREG);
1296 
1297     g_free(new_file);
1298 }
1299 
1300 static void fs_unlinkat_file(void *obj, void *data, QGuestAllocator *t_alloc)
1301 {
1302     QVirtio9P *v9p = obj;
1303     alloc = t_alloc;
1304     struct stat st;
1305     char *new_file = virtio_9p_test_path("04/doa_file");
1306 
1307     do_attach(v9p);
1308     do_mkdir(v9p, "/", "04");
1309     do_lcreate(v9p, "04", "doa_file");
1310 
1311     /* check if created file exists now ... */
1312     g_assert(stat(new_file, &st) == 0);
1313     /* ... and is a regular file */
1314     g_assert((st.st_mode & S_IFMT) == S_IFREG);
1315 
1316     do_unlinkat(v9p, "04", "doa_file", 0);
1317     /* file should be gone now */
1318     g_assert(stat(new_file, &st) != 0);
1319 
1320     g_free(new_file);
1321 }
1322 
1323 static void fs_symlink_file(void *obj, void *data, QGuestAllocator *t_alloc)
1324 {
1325     QVirtio9P *v9p = obj;
1326     alloc = t_alloc;
1327     struct stat st;
1328     char *real_file = virtio_9p_test_path("05/real_file");
1329     char *symlink_file = virtio_9p_test_path("05/symlink_file");
1330 
1331     do_attach(v9p);
1332     do_mkdir(v9p, "/", "05");
1333     do_lcreate(v9p, "05", "real_file");
1334     g_assert(stat(real_file, &st) == 0);
1335     g_assert((st.st_mode & S_IFMT) == S_IFREG);
1336 
1337     do_symlink(v9p, "05", "symlink_file", "real_file");
1338 
1339     /* check if created link exists now */
1340     g_assert(stat(symlink_file, &st) == 0);
1341 
1342     g_free(symlink_file);
1343     g_free(real_file);
1344 }
1345 
1346 static void fs_unlinkat_symlink(void *obj, void *data,
1347                                 QGuestAllocator *t_alloc)
1348 {
1349     QVirtio9P *v9p = obj;
1350     alloc = t_alloc;
1351     struct stat st;
1352     char *real_file = virtio_9p_test_path("06/real_file");
1353     char *symlink_file = virtio_9p_test_path("06/symlink_file");
1354 
1355     do_attach(v9p);
1356     do_mkdir(v9p, "/", "06");
1357     do_lcreate(v9p, "06", "real_file");
1358     g_assert(stat(real_file, &st) == 0);
1359     g_assert((st.st_mode & S_IFMT) == S_IFREG);
1360 
1361     do_symlink(v9p, "06", "symlink_file", "real_file");
1362     g_assert(stat(symlink_file, &st) == 0);
1363 
1364     do_unlinkat(v9p, "06", "symlink_file", 0);
1365     /* symlink should be gone now */
1366     g_assert(stat(symlink_file, &st) != 0);
1367 
1368     g_free(symlink_file);
1369     g_free(real_file);
1370 }
1371 
1372 static void fs_hardlink_file(void *obj, void *data, QGuestAllocator *t_alloc)
1373 {
1374     QVirtio9P *v9p = obj;
1375     alloc = t_alloc;
1376     struct stat st_real, st_link;
1377     char *real_file = virtio_9p_test_path("07/real_file");
1378     char *hardlink_file = virtio_9p_test_path("07/hardlink_file");
1379 
1380     do_attach(v9p);
1381     do_mkdir(v9p, "/", "07");
1382     do_lcreate(v9p, "07", "real_file");
1383     g_assert(stat(real_file, &st_real) == 0);
1384     g_assert((st_real.st_mode & S_IFMT) == S_IFREG);
1385 
1386     do_hardlink(v9p, "07", "hardlink_file", "07/real_file");
1387 
1388     /* check if link exists now ... */
1389     g_assert(stat(hardlink_file, &st_link) == 0);
1390     /* ... and it's a hard link, right? */
1391     g_assert((st_link.st_mode & S_IFMT) == S_IFREG);
1392     g_assert(st_link.st_dev == st_real.st_dev);
1393     g_assert(st_link.st_ino == st_real.st_ino);
1394 
1395     g_free(hardlink_file);
1396     g_free(real_file);
1397 }
1398 
1399 static void fs_unlinkat_hardlink(void *obj, void *data,
1400                                  QGuestAllocator *t_alloc)
1401 {
1402     QVirtio9P *v9p = obj;
1403     alloc = t_alloc;
1404     struct stat st_real, st_link;
1405     char *real_file = virtio_9p_test_path("08/real_file");
1406     char *hardlink_file = virtio_9p_test_path("08/hardlink_file");
1407 
1408     do_attach(v9p);
1409     do_mkdir(v9p, "/", "08");
1410     do_lcreate(v9p, "08", "real_file");
1411     g_assert(stat(real_file, &st_real) == 0);
1412     g_assert((st_real.st_mode & S_IFMT) == S_IFREG);
1413 
1414     do_hardlink(v9p, "08", "hardlink_file", "08/real_file");
1415     g_assert(stat(hardlink_file, &st_link) == 0);
1416 
1417     do_unlinkat(v9p, "08", "hardlink_file", 0);
1418     /* symlink should be gone now */
1419     g_assert(stat(hardlink_file, &st_link) != 0);
1420     /* and old file should still exist */
1421     g_assert(stat(real_file, &st_real) == 0);
1422 
1423     g_free(hardlink_file);
1424     g_free(real_file);
1425 }
1426 
1427 static void *assign_9p_local_driver(GString *cmd_line, void *arg)
1428 {
1429     virtio_9p_assign_local_driver(cmd_line, "security_model=mapped-xattr");
1430     return arg;
1431 }
1432 
1433 static void register_virtio_9p_test(void)
1434 {
1435 
1436     QOSGraphTestOptions opts = {
1437     };
1438 
1439     /* 9pfs test cases using the 'synth' filesystem driver */
1440     qos_add_test("synth/config", "virtio-9p", pci_config, &opts);
1441     qos_add_test("synth/version/basic", "virtio-9p", fs_version,  &opts);
1442     qos_add_test("synth/attach/basic", "virtio-9p", fs_attach,  &opts);
1443     qos_add_test("synth/walk/basic", "virtio-9p", fs_walk,  &opts);
1444     qos_add_test("synth/walk/no_slash", "virtio-9p", fs_walk_no_slash,
1445                   &opts);
1446     qos_add_test("synth/walk/dotdot_from_root", "virtio-9p",
1447                  fs_walk_dotdot,  &opts);
1448     qos_add_test("synth/lopen/basic", "virtio-9p", fs_lopen,  &opts);
1449     qos_add_test("synth/write/basic", "virtio-9p", fs_write,  &opts);
1450     qos_add_test("synth/flush/success", "virtio-9p", fs_flush_success,
1451                   &opts);
1452     qos_add_test("synth/flush/ignored", "virtio-9p", fs_flush_ignored,
1453                   &opts);
1454     qos_add_test("synth/readdir/basic", "virtio-9p", fs_readdir,  &opts);
1455     qos_add_test("synth/readdir/split_512", "virtio-9p",
1456                  fs_readdir_split_512,  &opts);
1457     qos_add_test("synth/readdir/split_256", "virtio-9p",
1458                  fs_readdir_split_256,  &opts);
1459     qos_add_test("synth/readdir/split_128", "virtio-9p",
1460                  fs_readdir_split_128,  &opts);
1461 
1462 
1463     /* 9pfs test cases using the 'local' filesystem driver */
1464 
1465     /*
1466      * XXX: Until we are sure that these tests can run everywhere,
1467      * keep them as "slow" so that they aren't run with "make check".
1468      */
1469     if (!g_test_slow()) {
1470         return;
1471     }
1472 
1473     opts.before = assign_9p_local_driver;
1474     qos_add_test("local/config", "virtio-9p", pci_config,  &opts);
1475     qos_add_test("local/create_dir", "virtio-9p", fs_create_dir, &opts);
1476     qos_add_test("local/unlinkat_dir", "virtio-9p", fs_unlinkat_dir, &opts);
1477     qos_add_test("local/create_file", "virtio-9p", fs_create_file, &opts);
1478     qos_add_test("local/unlinkat_file", "virtio-9p", fs_unlinkat_file, &opts);
1479     qos_add_test("local/symlink_file", "virtio-9p", fs_symlink_file, &opts);
1480     qos_add_test("local/unlinkat_symlink", "virtio-9p", fs_unlinkat_symlink,
1481                  &opts);
1482     qos_add_test("local/hardlink_file", "virtio-9p", fs_hardlink_file, &opts);
1483     qos_add_test("local/unlinkat_hardlink", "virtio-9p", fs_unlinkat_hardlink,
1484                  &opts);
1485 }
1486 
1487 libqos_init(register_virtio_9p_test);
1488 
1489 static void __attribute__((constructor)) construct_9p_test(void)
1490 {
1491     /* make sure test dir for the 'local' tests exists */
1492     virtio_9p_create_local_test_dir();
1493 }
1494 
1495 static void __attribute__((destructor)) destruct_9p_test(void)
1496 {
1497     /* remove previously created test dir when test suite completed */
1498     virtio_9p_remove_local_test_dir();
1499 }
1500