?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
migration: move some declarations to migration.h
[qemu/lumag.git] / hw / virtio-9p.c
blob7e2953567229c239f39296503b57b059ec81ad4a
1 /*
2 * Virtio 9p backend
3 *
4 * Copyright IBM, Corp. 2010
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 */
13
14 #include "virtio.h"
15 #include "pc.h"
16 #include "qemu_socket.h"
17 #include "virtio-9p.h"
18 #include "fsdev/qemu-fsdev.h"
19 #include "virtio-9p-debug.h"
20 #include "virtio-9p-xattr.h"
21
22 int debug_9p_pdu;
23
24 enum {
25 Oread = 0x00,
26 Owrite = 0x01,
27 Ordwr = 0x02,
28 Oexec = 0x03,
29 Oexcl = 0x04,
30 Otrunc = 0x10,
31 Orexec = 0x20,
32 Orclose = 0x40,
33 Oappend = 0x80,
34 };
35
36 static int omode_to_uflags(int8_t mode)
37 {
38 int ret = 0;
39
40 switch (mode & 3) {
41 case Oread:
42 ret = O_RDONLY;
43 break;
44 case Ordwr:
45 ret = O_RDWR;
46 break;
47 case Owrite:
48 ret = O_WRONLY;
49 break;
50 case Oexec:
51 ret = O_RDONLY;
52 break;
53 }
54
55 if (mode & Otrunc) {
56 ret |= O_TRUNC;
57 }
58
59 if (mode & Oappend) {
60 ret |= O_APPEND;
61 }
62
63 if (mode & Oexcl) {
64 ret |= O_EXCL;
65 }
66
67 return ret;
68 }
69
70 void cred_init(FsCred *credp)
71 {
72 credp->fc_uid = -1;
73 credp->fc_gid = -1;
74 credp->fc_mode = -1;
75 credp->fc_rdev = -1;
76 }
77
78 static int v9fs_do_lstat(V9fsState *s, V9fsString *path, struct stat *stbuf)
79 {
80 return s->ops->lstat(&s->ctx, path->data, stbuf);
81 }
82
83 static ssize_t v9fs_do_readlink(V9fsState *s, V9fsString *path, V9fsString *buf)
84 {
85 ssize_t len;
86
87 buf->data = qemu_malloc(1024);
88
89 len = s->ops->readlink(&s->ctx, path->data, buf->data, 1024 - 1);
90 if (len > -1) {
91 buf->size = len;
92 buf->data[len] = 0;
93 }
94
95 return len;
96 }
97
98 static int v9fs_do_close(V9fsState *s, int fd)
99 {
100 return s->ops->close(&s->ctx, fd);
101 }
102
103 static int v9fs_do_closedir(V9fsState *s, DIR *dir)
104 {
105 return s->ops->closedir(&s->ctx, dir);
106 }
107
108 static int v9fs_do_open(V9fsState *s, V9fsString *path, int flags)
109 {
110 return s->ops->open(&s->ctx, path->data, flags);
111 }
112
113 static DIR *v9fs_do_opendir(V9fsState *s, V9fsString *path)
114 {
115 return s->ops->opendir(&s->ctx, path->data);
116 }
117
118 static void v9fs_do_rewinddir(V9fsState *s, DIR *dir)
119 {
120 return s->ops->rewinddir(&s->ctx, dir);
121 }
122
123 static off_t v9fs_do_telldir(V9fsState *s, DIR *dir)
124 {
125 return s->ops->telldir(&s->ctx, dir);
126 }
127
128 static struct dirent *v9fs_do_readdir(V9fsState *s, DIR *dir)
129 {
130 return s->ops->readdir(&s->ctx, dir);
131 }
132
133 static void v9fs_do_seekdir(V9fsState *s, DIR *dir, off_t off)
134 {
135 return s->ops->seekdir(&s->ctx, dir, off);
136 }
137
138 static int v9fs_do_preadv(V9fsState *s, int fd, const struct iovec *iov,
139 int iovcnt, int64_t offset)
140 {
141 return s->ops->preadv(&s->ctx, fd, iov, iovcnt, offset);
142 }
143
144 static int v9fs_do_pwritev(V9fsState *s, int fd, const struct iovec *iov,
145 int iovcnt, int64_t offset)
146 {
147 return s->ops->pwritev(&s->ctx, fd, iov, iovcnt, offset);
148 }
149
150 static int v9fs_do_chmod(V9fsState *s, V9fsString *path, mode_t mode)
151 {
152 FsCred cred;
153 cred_init(&cred);
154 cred.fc_mode = mode;
155 return s->ops->chmod(&s->ctx, path->data, &cred);
156 }
157
158 static int v9fs_do_mknod(V9fsState *s, char *name,
159 mode_t mode, dev_t dev, uid_t uid, gid_t gid)
160 {
161 FsCred cred;
162 cred_init(&cred);
163 cred.fc_uid = uid;
164 cred.fc_gid = gid;
165 cred.fc_mode = mode;
166 cred.fc_rdev = dev;
167 return s->ops->mknod(&s->ctx, name, &cred);
168 }
169
170 static int v9fs_do_mkdir(V9fsState *s, char *name, mode_t mode,
171 uid_t uid, gid_t gid)
172 {
173 FsCred cred;
174
175 cred_init(&cred);
176 cred.fc_uid = uid;
177 cred.fc_gid = gid;
178 cred.fc_mode = mode;
179
180 return s->ops->mkdir(&s->ctx, name, &cred);
181 }
182
183 static int v9fs_do_fstat(V9fsState *s, int fd, struct stat *stbuf)
184 {
185 return s->ops->fstat(&s->ctx, fd, stbuf);
186 }
187
188 static int v9fs_do_open2(V9fsState *s, char *fullname, uid_t uid, gid_t gid,
189 int flags, int mode)
190 {
191 FsCred cred;
192
193 cred_init(&cred);
194 cred.fc_uid = uid;
195 cred.fc_gid = gid;
196 cred.fc_mode = mode & 07777;
197 flags = flags;
198
199 return s->ops->open2(&s->ctx, fullname, flags, &cred);
200 }
201
202 static int v9fs_do_symlink(V9fsState *s, V9fsFidState *fidp,
203 const char *oldpath, const char *newpath, gid_t gid)
204 {
205 FsCred cred;
206 cred_init(&cred);
207 cred.fc_uid = fidp->uid;
208 cred.fc_gid = gid;
209 cred.fc_mode = 0777;
210
211 return s->ops->symlink(&s->ctx, oldpath, newpath, &cred);
212 }
213
214 static int v9fs_do_link(V9fsState *s, V9fsString *oldpath, V9fsString *newpath)
215 {
216 return s->ops->link(&s->ctx, oldpath->data, newpath->data);
217 }
218
219 static int v9fs_do_truncate(V9fsState *s, V9fsString *path, off_t size)
220 {
221 return s->ops->truncate(&s->ctx, path->data, size);
222 }
223
224 static int v9fs_do_rename(V9fsState *s, V9fsString *oldpath,
225 V9fsString *newpath)
226 {
227 return s->ops->rename(&s->ctx, oldpath->data, newpath->data);
228 }
229
230 static int v9fs_do_chown(V9fsState *s, V9fsString *path, uid_t uid, gid_t gid)
231 {
232 FsCred cred;
233 cred_init(&cred);
234 cred.fc_uid = uid;
235 cred.fc_gid = gid;
236
237 return s->ops->chown(&s->ctx, path->data, &cred);
238 }
239
240 static int v9fs_do_utimensat(V9fsState *s, V9fsString *path,
241 const struct timespec times[2])
242 {
243 return s->ops->utimensat(&s->ctx, path->data, times);
244 }
245
246 static int v9fs_do_remove(V9fsState *s, V9fsString *path)
247 {
248 return s->ops->remove(&s->ctx, path->data);
249 }
250
251 static int v9fs_do_fsync(V9fsState *s, int fd, int datasync)
252 {
253 return s->ops->fsync(&s->ctx, fd, datasync);
254 }
255
256 static int v9fs_do_statfs(V9fsState *s, V9fsString *path, struct statfs *stbuf)
257 {
258 return s->ops->statfs(&s->ctx, path->data, stbuf);
259 }
260
261 static ssize_t v9fs_do_lgetxattr(V9fsState *s, V9fsString *path,
262 V9fsString *xattr_name,
263 void *value, size_t size)
264 {
265 return s->ops->lgetxattr(&s->ctx, path->data,
266 xattr_name->data, value, size);
267 }
268
269 static ssize_t v9fs_do_llistxattr(V9fsState *s, V9fsString *path,
270 void *value, size_t size)
271 {
272 return s->ops->llistxattr(&s->ctx, path->data,
273 value, size);
274 }
275
276 static int v9fs_do_lsetxattr(V9fsState *s, V9fsString *path,
277 V9fsString *xattr_name,
278 void *value, size_t size, int flags)
279 {
280 return s->ops->lsetxattr(&s->ctx, path->data,
281 xattr_name->data, value, size, flags);
282 }
283
284 static int v9fs_do_lremovexattr(V9fsState *s, V9fsString *path,
285 V9fsString *xattr_name)
286 {
287 return s->ops->lremovexattr(&s->ctx, path->data,
288 xattr_name->data);
289 }
290
291
292 static void v9fs_string_init(V9fsString *str)
293 {
294 str->data = NULL;
295 str->size = 0;
296 }
297
298 static void v9fs_string_free(V9fsString *str)
299 {
300 qemu_free(str->data);
301 str->data = NULL;
302 str->size = 0;
303 }
304
305 static void v9fs_string_null(V9fsString *str)
306 {
307 v9fs_string_free(str);
308 }
309
310 static int number_to_string(void *arg, char type)
311 {
312 unsigned int ret = 0;
313
314 switch (type) {
315 case 'u': {
316 unsigned int num = *(unsigned int *)arg;
317
318 do {
319 ret++;
320 num = num/10;
321 } while (num);
322 break;
323 }
324 case 'U': {
325 unsigned long num = *(unsigned long *)arg;
326 do {
327 ret++;
328 num = num/10;
329 } while (num);
330 break;
331 }
332 default:
333 printf("Number_to_string: Unknown number format\n");
334 return -1;
335 }
336
337 return ret;
338 }
339
340 static int GCC_FMT_ATTR(2, 0)
341 v9fs_string_alloc_printf(char **strp, const char *fmt, va_list ap)
342 {
343 va_list ap2;
344 char *iter = (char *)fmt;
345 int len = 0;
346 int nr_args = 0;
347 char *arg_char_ptr;
348 unsigned int arg_uint;
349 unsigned long arg_ulong;
350
351 /* Find the number of %'s that denotes an argument */
352 for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) {
353 nr_args++;
354 iter++;
355 }
356
357 len = strlen(fmt) - 2*nr_args;
358
359 if (!nr_args) {
360 goto alloc_print;
361 }
362
363 va_copy(ap2, ap);
364
365 iter = (char *)fmt;
366
367 /* Now parse the format string */
368 for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) {
369 iter++;
370 switch (*iter) {
371 case 'u':
372 arg_uint = va_arg(ap2, unsigned int);
373 len += number_to_string((void *)&arg_uint, 'u');
374 break;
375 case 'l':
376 if (*++iter == 'u') {
377 arg_ulong = va_arg(ap2, unsigned long);
378 len += number_to_string((void *)&arg_ulong, 'U');
379 } else {
380 return -1;
381 }
382 break;
383 case 's':
384 arg_char_ptr = va_arg(ap2, char *);
385 len += strlen(arg_char_ptr);
386 break;
387 case 'c':
388 len += 1;
389 break;
390 default:
391 fprintf(stderr,
392 "v9fs_string_alloc_printf:Incorrect format %c", *iter);
393 return -1;
394 }
395 iter++;
396 }
397
398 alloc_print:
399 *strp = qemu_malloc((len + 1) * sizeof(**strp));
400
401 return vsprintf(*strp, fmt, ap);
402 }
403
404 static void GCC_FMT_ATTR(2, 3)
405 v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
406 {
407 va_list ap;
408 int err;
409
410 v9fs_string_free(str);
411
412 va_start(ap, fmt);
413 err = v9fs_string_alloc_printf(&str->data, fmt, ap);
414 BUG_ON(err == -1);
415 va_end(ap);
416
417 str->size = err;
418 }
419
420 static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
421 {
422 v9fs_string_free(lhs);
423 v9fs_string_sprintf(lhs, "%s", rhs->data);
424 }
425
426 static size_t v9fs_string_size(V9fsString *str)
427 {
428 return str->size;
429 }
430
431 static V9fsFidState *lookup_fid(V9fsState *s, int32_t fid)
432 {
433 V9fsFidState *f;
434
435 for (f = s->fid_list; f; f = f->next) {
436 if (f->fid == fid) {
437 return f;
438 }
439 }
440
441 return NULL;
442 }
443
444 static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
445 {
446 V9fsFidState *f;
447
448 f = lookup_fid(s, fid);
449 if (f) {
450 return NULL;
451 }
452
453 f = qemu_mallocz(sizeof(V9fsFidState));
454
455 f->fid = fid;
456 f->fid_type = P9_FID_NONE;
457
458 f->next = s->fid_list;
459 s->fid_list = f;
460
461 return f;
462 }
463
464 static int v9fs_xattr_fid_clunk(V9fsState *s, V9fsFidState *fidp)
465 {
466 int retval = 0;
467
468 if (fidp->fs.xattr.copied_len == -1) {
469 /* getxattr/listxattr fid */
470 goto free_value;
471 }
472 /*
473 * if this is fid for setxattr. clunk should
474 * result in setxattr localcall
475 */
476 if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) {
477 /* clunk after partial write */
478 retval = -EINVAL;
479 goto free_out;
480 }
481 if (fidp->fs.xattr.len) {
482 retval = v9fs_do_lsetxattr(s, &fidp->path, &fidp->fs.xattr.name,
483 fidp->fs.xattr.value,
484 fidp->fs.xattr.len,
485 fidp->fs.xattr.flags);
486 } else {
487 retval = v9fs_do_lremovexattr(s, &fidp->path, &fidp->fs.xattr.name);
488 }
489 free_out:
490 v9fs_string_free(&fidp->fs.xattr.name);
491 free_value:
492 if (fidp->fs.xattr.value) {
493 qemu_free(fidp->fs.xattr.value);
494 }
495 return retval;
496 }
497
498 static int free_fid(V9fsState *s, int32_t fid)
499 {
500 int retval = 0;
501 V9fsFidState **fidpp, *fidp;
502
503 for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) {
504 if ((*fidpp)->fid == fid) {
505 break;
506 }
507 }
508
509 if (*fidpp == NULL) {
510 return -ENOENT;
511 }
512
513 fidp = *fidpp;
514 *fidpp = fidp->next;
515
516 if (fidp->fid_type == P9_FID_FILE) {
517 v9fs_do_close(s, fidp->fs.fd);
518 } else if (fidp->fid_type == P9_FID_DIR) {
519 v9fs_do_closedir(s, fidp->fs.dir);
520 } else if (fidp->fid_type == P9_FID_XATTR) {
521 retval = v9fs_xattr_fid_clunk(s, fidp);
522 }
523 v9fs_string_free(&fidp->path);
524 qemu_free(fidp);
525
526 return retval;
527 }
528
529 #define P9_QID_TYPE_DIR 0x80
530 #define P9_QID_TYPE_SYMLINK 0x02
531
532 #define P9_STAT_MODE_DIR 0x80000000
533 #define P9_STAT_MODE_APPEND 0x40000000
534 #define P9_STAT_MODE_EXCL 0x20000000
535 #define P9_STAT_MODE_MOUNT 0x10000000
536 #define P9_STAT_MODE_AUTH 0x08000000
537 #define P9_STAT_MODE_TMP 0x04000000
538 #define P9_STAT_MODE_SYMLINK 0x02000000
539 #define P9_STAT_MODE_LINK 0x01000000
540 #define P9_STAT_MODE_DEVICE 0x00800000
541 #define P9_STAT_MODE_NAMED_PIPE 0x00200000
542 #define P9_STAT_MODE_SOCKET 0x00100000
543 #define P9_STAT_MODE_SETUID 0x00080000
544 #define P9_STAT_MODE_SETGID 0x00040000
545 #define P9_STAT_MODE_SETVTX 0x00010000
546
547 #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
548 P9_STAT_MODE_SYMLINK | \
549 P9_STAT_MODE_LINK | \
550 P9_STAT_MODE_DEVICE | \
551 P9_STAT_MODE_NAMED_PIPE | \
552 P9_STAT_MODE_SOCKET)
553
554 /* This is the algorithm from ufs in spfs */
555 static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
556 {
557 size_t size;
558
559 size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path));
560 memcpy(&qidp->path, &stbuf->st_ino, size);
561 qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8);
562 qidp->type = 0;
563 if (S_ISDIR(stbuf->st_mode)) {
564 qidp->type |= P9_QID_TYPE_DIR;
565 }
566 if (S_ISLNK(stbuf->st_mode)) {
567 qidp->type |= P9_QID_TYPE_SYMLINK;
568 }
569 }
570
571 static int fid_to_qid(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp)
572 {
573 struct stat stbuf;
574 int err;
575
576 err = v9fs_do_lstat(s, &fidp->path, &stbuf);
577 if (err) {
578 return err;
579 }
580
581 stat_to_qid(&stbuf, qidp);
582 return 0;
583 }
584
585 static V9fsPDU *alloc_pdu(V9fsState *s)
586 {
587 V9fsPDU *pdu = NULL;
588
589 if (!QLIST_EMPTY(&s->free_list)) {
590 pdu = QLIST_FIRST(&s->free_list);
591 QLIST_REMOVE(pdu, next);
592 }
593 return pdu;
594 }
595
596 static void free_pdu(V9fsState *s, V9fsPDU *pdu)
597 {
598 if (pdu) {
599 QLIST_INSERT_HEAD(&s->free_list, pdu, next);
600 }
601 }
602
603 size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
604 size_t offset, size_t size, int pack)
605 {
606 int i = 0;
607 size_t copied = 0;
608
609 for (i = 0; size && i < sg_count; i++) {
610 size_t len;
611 if (offset >= sg[i].iov_len) {
612 /* skip this sg */
613 offset -= sg[i].iov_len;
614 continue;
615 } else {
616 len = MIN(sg[i].iov_len - offset, size);
617 if (pack) {
618 memcpy(sg[i].iov_base + offset, addr, len);
619 } else {
620 memcpy(addr, sg[i].iov_base + offset, len);
621 }
622 size -= len;
623 copied += len;
624 addr += len;
625 if (size) {
626 offset = 0;
627 continue;
628 }
629 }
630 }
631
632 return copied;
633 }
634
635 static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size)
636 {
637 return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
638 offset, size, 0);
639 }
640
641 static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src,
642 size_t size)
643 {
644 return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num,
645 offset, size, 1);
646 }
647
648 static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg)
649 {
650 size_t pos = 0;
651 int i, j;
652 struct iovec *src_sg;
653 unsigned int num;
654
655 if (rx) {
656 src_sg = pdu->elem.in_sg;
657 num = pdu->elem.in_num;
658 } else {
659 src_sg = pdu->elem.out_sg;
660 num = pdu->elem.out_num;
661 }
662
663 j = 0;
664 for (i = 0; i < num; i++) {
665 if (offset <= pos) {
666 sg[j].iov_base = src_sg[i].iov_base;
667 sg[j].iov_len = src_sg[i].iov_len;
668 j++;
669 } else if (offset < (src_sg[i].iov_len + pos)) {
670 sg[j].iov_base = src_sg[i].iov_base;
671 sg[j].iov_len = src_sg[i].iov_len;
672 sg[j].iov_base += (offset - pos);
673 sg[j].iov_len -= (offset - pos);
674 j++;
675 }
676 pos += src_sg[i].iov_len;
677 }
678
679 return j;
680 }
681
682 static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
683 {
684 size_t old_offset = offset;
685 va_list ap;
686 int i;
687
688 va_start(ap, fmt);
689 for (i = 0; fmt[i]; i++) {
690 switch (fmt[i]) {
691 case 'b': {
692 uint8_t *valp = va_arg(ap, uint8_t *);
693 offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
694 break;
695 }
696 case 'w': {
697 uint16_t val, *valp;
698 valp = va_arg(ap, uint16_t *);
699 offset += pdu_unpack(&val, pdu, offset, sizeof(val));
700 *valp = le16_to_cpu(val);
701 break;
702 }
703 case 'd': {
704 uint32_t val, *valp;
705 valp = va_arg(ap, uint32_t *);
706 offset += pdu_unpack(&val, pdu, offset, sizeof(val));
707 *valp = le32_to_cpu(val);
708 break;
709 }
710 case 'q': {
711 uint64_t val, *valp;
712 valp = va_arg(ap, uint64_t *);
713 offset += pdu_unpack(&val, pdu, offset, sizeof(val));
714 *valp = le64_to_cpu(val);
715 break;
716 }
717 case 'v': {
718 struct iovec *iov = va_arg(ap, struct iovec *);
719 int *iovcnt = va_arg(ap, int *);
720 *iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
721 break;
722 }
723 case 's': {
724 V9fsString *str = va_arg(ap, V9fsString *);
725 offset += pdu_unmarshal(pdu, offset, "w", &str->size);
726 /* FIXME: sanity check str->size */
727 str->data = qemu_malloc(str->size + 1);
728 offset += pdu_unpack(str->data, pdu, offset, str->size);
729 str->data[str->size] = 0;
730 break;
731 }
732 case 'Q': {
733 V9fsQID *qidp = va_arg(ap, V9fsQID *);
734 offset += pdu_unmarshal(pdu, offset, "bdq",
735 &qidp->type, &qidp->version, &qidp->path);
736 break;
737 }
738 case 'S': {
739 V9fsStat *statp = va_arg(ap, V9fsStat *);
740 offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
741 &statp->size, &statp->type, &statp->dev,
742 &statp->qid, &statp->mode, &statp->atime,
743 &statp->mtime, &statp->length,
744 &statp->name, &statp->uid, &statp->gid,
745 &statp->muid, &statp->extension,
746 &statp->n_uid, &statp->n_gid,
747 &statp->n_muid);
748 break;
749 }
750 case 'I': {
751 V9fsIattr *iattr = va_arg(ap, V9fsIattr *);
752 offset += pdu_unmarshal(pdu, offset, "ddddqqqqq",
753 &iattr->valid, &iattr->mode,
754 &iattr->uid, &iattr->gid, &iattr->size,
755 &iattr->atime_sec, &iattr->atime_nsec,
756 &iattr->mtime_sec, &iattr->mtime_nsec);
757 break;
758 }
759 default:
760 break;
761 }
762 }
763
764 va_end(ap);
765
766 return offset - old_offset;
767 }
768
769 static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
770 {
771 size_t old_offset = offset;
772 va_list ap;
773 int i;
774
775 va_start(ap, fmt);
776 for (i = 0; fmt[i]; i++) {
777 switch (fmt[i]) {
778 case 'b': {
779 uint8_t val = va_arg(ap, int);
780 offset += pdu_pack(pdu, offset, &val, sizeof(val));
781 break;
782 }
783 case 'w': {
784 uint16_t val;
785 cpu_to_le16w(&val, va_arg(ap, int));
786 offset += pdu_pack(pdu, offset, &val, sizeof(val));
787 break;
788 }
789 case 'd': {
790 uint32_t val;
791 cpu_to_le32w(&val, va_arg(ap, uint32_t));
792 offset += pdu_pack(pdu, offset, &val, sizeof(val));
793 break;
794 }
795 case 'q': {
796 uint64_t val;
797 cpu_to_le64w(&val, va_arg(ap, uint64_t));
798 offset += pdu_pack(pdu, offset, &val, sizeof(val));
799 break;
800 }
801 case 'v': {
802 struct iovec *iov = va_arg(ap, struct iovec *);
803 int *iovcnt = va_arg(ap, int *);
804 *iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
805 break;
806 }
807 case 's': {
808 V9fsString *str = va_arg(ap, V9fsString *);
809 offset += pdu_marshal(pdu, offset, "w", str->size);
810 offset += pdu_pack(pdu, offset, str->data, str->size);
811 break;
812 }
813 case 'Q': {
814 V9fsQID *qidp = va_arg(ap, V9fsQID *);
815 offset += pdu_marshal(pdu, offset, "bdq",
816 qidp->type, qidp->version, qidp->path);
817 break;
818 }
819 case 'S': {
820 V9fsStat *statp = va_arg(ap, V9fsStat *);
821 offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
822 statp->size, statp->type, statp->dev,
823 &statp->qid, statp->mode, statp->atime,
824 statp->mtime, statp->length, &statp->name,
825 &statp->uid, &statp->gid, &statp->muid,
826 &statp->extension, statp->n_uid,
827 statp->n_gid, statp->n_muid);
828 break;
829 }
830 case 'A': {
831 V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *);
832 offset += pdu_marshal(pdu, offset, "qQdddqqqqqqqqqqqqqqq",
833 statp->st_result_mask,
834 &statp->qid, statp->st_mode,
835 statp->st_uid, statp->st_gid,
836 statp->st_nlink, statp->st_rdev,
837 statp->st_size, statp->st_blksize, statp->st_blocks,
838 statp->st_atime_sec, statp->st_atime_nsec,
839 statp->st_mtime_sec, statp->st_mtime_nsec,
840 statp->st_ctime_sec, statp->st_ctime_nsec,
841 statp->st_btime_sec, statp->st_btime_nsec,
842 statp->st_gen, statp->st_data_version);
843 break;
844 }
845 default:
846 break;
847 }
848 }
849 va_end(ap);
850
851 return offset - old_offset;
852 }
853
854 static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
855 {
856 int8_t id = pdu->id + 1; /* Response */
857
858 if (len < 0) {
859 int err = -len;
860 len = 7;
861
862 if (s->proto_version != V9FS_PROTO_2000L) {
863 V9fsString str;
864
865 str.data = strerror(err);
866 str.size = strlen(str.data);
867
868 len += pdu_marshal(pdu, len, "s", &str);
869 id = P9_RERROR;
870 }
871
872 len += pdu_marshal(pdu, len, "d", err);
873
874 if (s->proto_version == V9FS_PROTO_2000L) {
875 id = P9_RLERROR;
876 }
877 }
878
879 /* fill out the header */
880 pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);
881
882 /* keep these in sync */
883 pdu->size = len;
884 pdu->id = id;
885
886 /* push onto queue and notify */
887 virtqueue_push(s->vq, &pdu->elem, len);
888
889 /* FIXME: we should batch these completions */
890 virtio_notify(&s->vdev, s->vq);
891
892 free_pdu(s, pdu);
893 }
894
895 static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
896 {
897 mode_t ret;
898
899 ret = mode & 0777;
900 if (mode & P9_STAT_MODE_DIR) {
901 ret |= S_IFDIR;
902 }
903
904 if (mode & P9_STAT_MODE_SYMLINK) {
905 ret |= S_IFLNK;
906 }
907 if (mode & P9_STAT_MODE_SOCKET) {
908 ret |= S_IFSOCK;
909 }
910 if (mode & P9_STAT_MODE_NAMED_PIPE) {
911 ret |= S_IFIFO;
912 }
913 if (mode & P9_STAT_MODE_DEVICE) {
914 if (extension && extension->data[0] == 'c') {
915 ret |= S_IFCHR;
916 } else {
917 ret |= S_IFBLK;
918 }
919 }
920
921 if (!(ret&~0777)) {
922 ret |= S_IFREG;
923 }
924
925 if (mode & P9_STAT_MODE_SETUID) {
926 ret |= S_ISUID;
927 }
928 if (mode & P9_STAT_MODE_SETGID) {
929 ret |= S_ISGID;
930 }
931 if (mode & P9_STAT_MODE_SETVTX) {
932 ret |= S_ISVTX;
933 }
934
935 return ret;
936 }
937
938 static int donttouch_stat(V9fsStat *stat)
939 {
940 if (stat->type == -1 &&
941 stat->dev == -1 &&
942 stat->qid.type == -1 &&
943 stat->qid.version == -1 &&
944 stat->qid.path == -1 &&
945 stat->mode == -1 &&
946 stat->atime == -1 &&
947 stat->mtime == -1 &&
948 stat->length == -1 &&
949 !stat->name.size &&
950 !stat->uid.size &&
951 !stat->gid.size &&
952 !stat->muid.size &&
953 stat->n_uid == -1 &&
954 stat->n_gid == -1 &&
955 stat->n_muid == -1) {
956 return 1;
957 }
958
959 return 0;
960 }
961
962 static void v9fs_stat_free(V9fsStat *stat)
963 {
964 v9fs_string_free(&stat->name);
965 v9fs_string_free(&stat->uid);
966 v9fs_string_free(&stat->gid);
967 v9fs_string_free(&stat->muid);
968 v9fs_string_free(&stat->extension);
969 }
970
971 static uint32_t stat_to_v9mode(const struct stat *stbuf)
972 {
973 uint32_t mode;
974
975 mode = stbuf->st_mode & 0777;
976 if (S_ISDIR(stbuf->st_mode)) {
977 mode |= P9_STAT_MODE_DIR;
978 }
979
980 if (S_ISLNK(stbuf->st_mode)) {
981 mode |= P9_STAT_MODE_SYMLINK;
982 }
983
984 if (S_ISSOCK(stbuf->st_mode)) {
985 mode |= P9_STAT_MODE_SOCKET;
986 }
987
988 if (S_ISFIFO(stbuf->st_mode)) {
989 mode |= P9_STAT_MODE_NAMED_PIPE;
990 }
991
992 if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
993 mode |= P9_STAT_MODE_DEVICE;
994 }
995
996 if (stbuf->st_mode & S_ISUID) {
997 mode |= P9_STAT_MODE_SETUID;
998 }
999
1000 if (stbuf->st_mode & S_ISGID) {
1001 mode |= P9_STAT_MODE_SETGID;
1002 }
1003
1004 if (stbuf->st_mode & S_ISVTX) {
1005 mode |= P9_STAT_MODE_SETVTX;
1006 }
1007
1008 return mode;
1009 }
1010
1011 static int stat_to_v9stat(V9fsState *s, V9fsString *name,
1012 const struct stat *stbuf,
1013 V9fsStat *v9stat)
1014 {
1015 int err;
1016 const char *str;
1017
1018 memset(v9stat, 0, sizeof(*v9stat));
1019
1020 stat_to_qid(stbuf, &v9stat->qid);
1021 v9stat->mode = stat_to_v9mode(stbuf);
1022 v9stat->atime = stbuf->st_atime;
1023 v9stat->mtime = stbuf->st_mtime;
1024 v9stat->length = stbuf->st_size;
1025
1026 v9fs_string_null(&v9stat->uid);
1027 v9fs_string_null(&v9stat->gid);
1028 v9fs_string_null(&v9stat->muid);
1029
1030 v9stat->n_uid = stbuf->st_uid;
1031 v9stat->n_gid = stbuf->st_gid;
1032 v9stat->n_muid = 0;
1033
1034 v9fs_string_null(&v9stat->extension);
1035
1036 if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
1037 err = v9fs_do_readlink(s, name, &v9stat->extension);
1038 if (err == -1) {
1039 err = -errno;
1040 return err;
1041 }
1042 v9stat->extension.data[err] = 0;
1043 v9stat->extension.size = err;
1044 } else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
1045 v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
1046 S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
1047 major(stbuf->st_rdev), minor(stbuf->st_rdev));
1048 } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
1049 v9fs_string_sprintf(&v9stat->extension, "%s %lu",
1050 "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
1051 }
1052
1053 str = strrchr(name->data, '/');
1054 if (str) {
1055 str += 1;
1056 } else {
1057 str = name->data;
1058 }
1059
1060 v9fs_string_sprintf(&v9stat->name, "%s", str);
1061
1062 v9stat->size = 61 +
1063 v9fs_string_size(&v9stat->name) +
1064 v9fs_string_size(&v9stat->uid) +
1065 v9fs_string_size(&v9stat->gid) +
1066 v9fs_string_size(&v9stat->muid) +
1067 v9fs_string_size(&v9stat->extension);
1068 return 0;
1069 }
1070
1071 #define P9_STATS_MODE 0x00000001ULL
1072 #define P9_STATS_NLINK 0x00000002ULL
1073 #define P9_STATS_UID 0x00000004ULL
1074 #define P9_STATS_GID 0x00000008ULL
1075 #define P9_STATS_RDEV 0x00000010ULL
1076 #define P9_STATS_ATIME 0x00000020ULL
1077 #define P9_STATS_MTIME 0x00000040ULL
1078 #define P9_STATS_CTIME 0x00000080ULL
1079 #define P9_STATS_INO 0x00000100ULL
1080 #define P9_STATS_SIZE 0x00000200ULL
1081 #define P9_STATS_BLOCKS 0x00000400ULL
1082
1083 #define P9_STATS_BTIME 0x00000800ULL
1084 #define P9_STATS_GEN 0x00001000ULL
1085 #define P9_STATS_DATA_VERSION 0x00002000ULL
1086
1087 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
1088 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
1089
1090
1091 static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
1092 V9fsStatDotl *v9lstat)
1093 {
1094 memset(v9lstat, 0, sizeof(*v9lstat));
1095
1096 v9lstat->st_mode = stbuf->st_mode;
1097 v9lstat->st_nlink = stbuf->st_nlink;
1098 v9lstat->st_uid = stbuf->st_uid;
1099 v9lstat->st_gid = stbuf->st_gid;
1100 v9lstat->st_rdev = stbuf->st_rdev;
1101 v9lstat->st_size = stbuf->st_size;
1102 v9lstat->st_blksize = stbuf->st_blksize;
1103 v9lstat->st_blocks = stbuf->st_blocks;
1104 v9lstat->st_atime_sec = stbuf->st_atime;
1105 v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
1106 v9lstat->st_mtime_sec = stbuf->st_mtime;
1107 v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
1108 v9lstat->st_ctime_sec = stbuf->st_ctime;
1109 v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
1110 /* Currently we only support BASIC fields in stat */
1111 v9lstat->st_result_mask = P9_STATS_BASIC;
1112
1113 stat_to_qid(stbuf, &v9lstat->qid);
1114 }
1115
1116 static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt)
1117 {
1118 while (len && *iovcnt) {
1119 if (len < sg->iov_len) {
1120 sg->iov_len -= len;
1121 sg->iov_base += len;
1122 len = 0;
1123 } else {
1124 len -= sg->iov_len;
1125 sg++;
1126 *iovcnt -= 1;
1127 }
1128 }
1129
1130 return sg;
1131 }
1132
1133 static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt)
1134 {
1135 int i;
1136 int total = 0;
1137
1138 for (i = 0; i < *cnt; i++) {
1139 if ((total + sg[i].iov_len) > cap) {
1140 sg[i].iov_len -= ((total + sg[i].iov_len) - cap);
1141 i++;
1142 break;
1143 }
1144 total += sg[i].iov_len;
1145 }
1146
1147 *cnt = i;
1148
1149 return sg;
1150 }
1151
1152 static void print_sg(struct iovec *sg, int cnt)
1153 {
1154 int i;
1155
1156 printf("sg[%d]: {", cnt);
1157 for (i = 0; i < cnt; i++) {
1158 if (i) {
1159 printf(", ");
1160 }
1161 printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
1162 }
1163 printf("}\n");
1164 }
1165
1166 static void v9fs_fix_path(V9fsString *dst, V9fsString *src, int len)
1167 {
1168 V9fsString str;
1169 v9fs_string_init(&str);
1170 v9fs_string_copy(&str, dst);
1171 v9fs_string_sprintf(dst, "%s%s", src->data, str.data+len);
1172 v9fs_string_free(&str);
1173 }
1174
1175 static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
1176 {
1177 V9fsString version;
1178 size_t offset = 7;
1179
1180 pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
1181
1182 if (!strcmp(version.data, "9P2000.u")) {
1183 s->proto_version = V9FS_PROTO_2000U;
1184 } else if (!strcmp(version.data, "9P2000.L")) {
1185 s->proto_version = V9FS_PROTO_2000L;
1186 } else {
1187 v9fs_string_sprintf(&version, "unknown");
1188 }
1189
1190 offset += pdu_marshal(pdu, offset, "ds", s->msize, &version);
1191 complete_pdu(s, pdu, offset);
1192
1193 v9fs_string_free(&version);
1194 }
1195
1196 static void v9fs_attach(V9fsState *s, V9fsPDU *pdu)
1197 {
1198 int32_t fid, afid, n_uname;
1199 V9fsString uname, aname;
1200 V9fsFidState *fidp;
1201 V9fsQID qid;
1202 size_t offset = 7;
1203 ssize_t err;
1204
1205 pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname);
1206
1207 fidp = alloc_fid(s, fid);
1208 if (fidp == NULL) {
1209 err = -EINVAL;
1210 goto out;
1211 }
1212
1213 fidp->uid = n_uname;
1214
1215 v9fs_string_sprintf(&fidp->path, "%s", "/");
1216 err = fid_to_qid(s, fidp, &qid);
1217 if (err) {
1218 err = -EINVAL;
1219 free_fid(s, fid);
1220 goto out;
1221 }
1222
1223 offset += pdu_marshal(pdu, offset, "Q", &qid);
1224
1225 err = offset;
1226 out:
1227 complete_pdu(s, pdu, err);
1228 v9fs_string_free(&uname);
1229 v9fs_string_free(&aname);
1230 }
1231
1232 static void v9fs_stat_post_lstat(V9fsState *s, V9fsStatState *vs, int err)
1233 {
1234 if (err == -1) {
1235 err = -errno;
1236 goto out;
1237 }
1238
1239 err = stat_to_v9stat(s, &vs->fidp->path, &vs->stbuf, &vs->v9stat);
1240 if (err) {
1241 goto out;
1242 }
1243 vs->offset += pdu_marshal(vs->pdu, vs->offset, "wS", 0, &vs->v9stat);
1244 err = vs->offset;
1245
1246 out:
1247 complete_pdu(s, vs->pdu, err);
1248 v9fs_stat_free(&vs->v9stat);
1249 qemu_free(vs);
1250 }
1251
1252 static void v9fs_stat(V9fsState *s, V9fsPDU *pdu)
1253 {
1254 int32_t fid;
1255 V9fsStatState *vs;
1256 ssize_t err = 0;
1257
1258 vs = qemu_malloc(sizeof(*vs));
1259 vs->pdu = pdu;
1260 vs->offset = 7;
1261
1262 memset(&vs->v9stat, 0, sizeof(vs->v9stat));
1263
1264 pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
1265
1266 vs->fidp = lookup_fid(s, fid);
1267 if (vs->fidp == NULL) {
1268 err = -ENOENT;
1269 goto out;
1270 }
1271
1272 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1273 v9fs_stat_post_lstat(s, vs, err);
1274 return;
1275
1276 out:
1277 complete_pdu(s, vs->pdu, err);
1278 v9fs_stat_free(&vs->v9stat);
1279 qemu_free(vs);
1280 }
1281
1282 static void v9fs_getattr_post_lstat(V9fsState *s, V9fsStatStateDotl *vs,
1283 int err)
1284 {
1285 if (err == -1) {
1286 err = -errno;
1287 goto out;
1288 }
1289
1290 stat_to_v9stat_dotl(s, &vs->stbuf, &vs->v9stat_dotl);
1291 vs->offset += pdu_marshal(vs->pdu, vs->offset, "A", &vs->v9stat_dotl);
1292 err = vs->offset;
1293
1294 out:
1295 complete_pdu(s, vs->pdu, err);
1296 qemu_free(vs);
1297 }
1298
1299 static void v9fs_getattr(V9fsState *s, V9fsPDU *pdu)
1300 {
1301 int32_t fid;
1302 V9fsStatStateDotl *vs;
1303 ssize_t err = 0;
1304 V9fsFidState *fidp;
1305 uint64_t request_mask;
1306
1307 vs = qemu_malloc(sizeof(*vs));
1308 vs->pdu = pdu;
1309 vs->offset = 7;
1310
1311 memset(&vs->v9stat_dotl, 0, sizeof(vs->v9stat_dotl));
1312
1313 pdu_unmarshal(vs->pdu, vs->offset, "dq", &fid, &request_mask);
1314
1315 fidp = lookup_fid(s, fid);
1316 if (fidp == NULL) {
1317 err = -ENOENT;
1318 goto out;
1319 }
1320
1321 /* Currently we only support BASIC fields in stat, so there is no
1322 * need to look at request_mask.
1323 */
1324 err = v9fs_do_lstat(s, &fidp->path, &vs->stbuf);
1325 v9fs_getattr_post_lstat(s, vs, err);
1326 return;
1327
1328 out:
1329 complete_pdu(s, vs->pdu, err);
1330 qemu_free(vs);
1331 }
1332
1333 /* From Linux kernel code */
1334 #define ATTR_MODE (1 << 0)
1335 #define ATTR_UID (1 << 1)
1336 #define ATTR_GID (1 << 2)
1337 #define ATTR_SIZE (1 << 3)
1338 #define ATTR_ATIME (1 << 4)
1339 #define ATTR_MTIME (1 << 5)
1340 #define ATTR_CTIME (1 << 6)
1341 #define ATTR_MASK 127
1342 #define ATTR_ATIME_SET (1 << 7)
1343 #define ATTR_MTIME_SET (1 << 8)
1344
1345 static void v9fs_setattr_post_truncate(V9fsState *s, V9fsSetattrState *vs,
1346 int err)
1347 {
1348 if (err == -1) {
1349 err = -errno;
1350 goto out;
1351 }
1352 err = vs->offset;
1353
1354 out:
1355 complete_pdu(s, vs->pdu, err);
1356 qemu_free(vs);
1357 }
1358
1359 static void v9fs_setattr_post_chown(V9fsState *s, V9fsSetattrState *vs, int err)
1360 {
1361 if (err == -1) {
1362 err = -errno;
1363 goto out;
1364 }
1365
1366 if (vs->v9iattr.valid & (ATTR_SIZE)) {
1367 err = v9fs_do_truncate(s, &vs->fidp->path, vs->v9iattr.size);
1368 }
1369 v9fs_setattr_post_truncate(s, vs, err);
1370 return;
1371
1372 out:
1373 complete_pdu(s, vs->pdu, err);
1374 qemu_free(vs);
1375 }
1376
1377 static void v9fs_setattr_post_utimensat(V9fsState *s, V9fsSetattrState *vs,
1378 int err)
1379 {
1380 if (err == -1) {
1381 err = -errno;
1382 goto out;
1383 }
1384
1385 /* If the only valid entry in iattr is ctime we can call
1386 * chown(-1,-1) to update the ctime of the file
1387 */
1388 if ((vs->v9iattr.valid & (ATTR_UID | ATTR_GID)) ||
1389 ((vs->v9iattr.valid & ATTR_CTIME)
1390 && !((vs->v9iattr.valid & ATTR_MASK) & ~ATTR_CTIME))) {
1391 if (!(vs->v9iattr.valid & ATTR_UID)) {
1392 vs->v9iattr.uid = -1;
1393 }
1394 if (!(vs->v9iattr.valid & ATTR_GID)) {
1395 vs->v9iattr.gid = -1;
1396 }
1397 err = v9fs_do_chown(s, &vs->fidp->path, vs->v9iattr.uid,
1398 vs->v9iattr.gid);
1399 }
1400 v9fs_setattr_post_chown(s, vs, err);
1401 return;
1402
1403 out:
1404 complete_pdu(s, vs->pdu, err);
1405 qemu_free(vs);
1406 }
1407
1408 static void v9fs_setattr_post_chmod(V9fsState *s, V9fsSetattrState *vs, int err)
1409 {
1410 if (err == -1) {
1411 err = -errno;
1412 goto out;
1413 }
1414
1415 if (vs->v9iattr.valid & (ATTR_ATIME | ATTR_MTIME)) {
1416 struct timespec times[2];
1417 if (vs->v9iattr.valid & ATTR_ATIME) {
1418 if (vs->v9iattr.valid & ATTR_ATIME_SET) {
1419 times[0].tv_sec = vs->v9iattr.atime_sec;
1420 times[0].tv_nsec = vs->v9iattr.atime_nsec;
1421 } else {
1422 times[0].tv_nsec = UTIME_NOW;
1423 }
1424 } else {
1425 times[0].tv_nsec = UTIME_OMIT;
1426 }
1427
1428 if (vs->v9iattr.valid & ATTR_MTIME) {
1429 if (vs->v9iattr.valid & ATTR_MTIME_SET) {
1430 times[1].tv_sec = vs->v9iattr.mtime_sec;
1431 times[1].tv_nsec = vs->v9iattr.mtime_nsec;
1432 } else {
1433 times[1].tv_nsec = UTIME_NOW;
1434 }
1435 } else {
1436 times[1].tv_nsec = UTIME_OMIT;
1437 }
1438 err = v9fs_do_utimensat(s, &vs->fidp->path, times);
1439 }
1440 v9fs_setattr_post_utimensat(s, vs, err);
1441 return;
1442
1443 out:
1444 complete_pdu(s, vs->pdu, err);
1445 qemu_free(vs);
1446 }
1447
1448 static void v9fs_setattr(V9fsState *s, V9fsPDU *pdu)
1449 {
1450 int32_t fid;
1451 V9fsSetattrState *vs;
1452 int err = 0;
1453
1454 vs = qemu_malloc(sizeof(*vs));
1455 vs->pdu = pdu;
1456 vs->offset = 7;
1457
1458 pdu_unmarshal(pdu, vs->offset, "dI", &fid, &vs->v9iattr);
1459
1460 vs->fidp = lookup_fid(s, fid);
1461 if (vs->fidp == NULL) {
1462 err = -EINVAL;
1463 goto out;
1464 }
1465
1466 if (vs->v9iattr.valid & ATTR_MODE) {
1467 err = v9fs_do_chmod(s, &vs->fidp->path, vs->v9iattr.mode);
1468 }
1469
1470 v9fs_setattr_post_chmod(s, vs, err);
1471 return;
1472
1473 out:
1474 complete_pdu(s, vs->pdu, err);
1475 qemu_free(vs);
1476 }
1477
1478 static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err)
1479 {
1480 complete_pdu(s, vs->pdu, err);
1481
1482 if (vs->nwnames) {
1483 for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) {
1484 v9fs_string_free(&vs->wnames[vs->name_idx]);
1485 }
1486
1487 qemu_free(vs->wnames);
1488 qemu_free(vs->qids);
1489 }
1490 }
1491
1492 static void v9fs_walk_marshal(V9fsWalkState *vs)
1493 {
1494 int i;
1495 vs->offset = 7;
1496 vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames);
1497
1498 for (i = 0; i < vs->nwnames; i++) {
1499 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]);
1500 }
1501 }
1502
1503 static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs,
1504 int err)
1505 {
1506 if (err == -1) {
1507 free_fid(s, vs->newfidp->fid);
1508 v9fs_string_free(&vs->path);
1509 err = -ENOENT;
1510 goto out;
1511 }
1512
1513 stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
1514
1515 vs->name_idx++;
1516 if (vs->name_idx < vs->nwnames) {
1517 v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
1518 vs->wnames[vs->name_idx].data);
1519 v9fs_string_copy(&vs->newfidp->path, &vs->path);
1520
1521 err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
1522 v9fs_walk_post_newfid_lstat(s, vs, err);
1523 return;
1524 }
1525
1526 v9fs_string_free(&vs->path);
1527 v9fs_walk_marshal(vs);
1528 err = vs->offset;
1529 out:
1530 v9fs_walk_complete(s, vs, err);
1531 }
1532
1533 static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs,
1534 int err)
1535 {
1536 if (err == -1) {
1537 v9fs_string_free(&vs->path);
1538 err = -ENOENT;
1539 goto out;
1540 }
1541
1542 stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
1543 vs->name_idx++;
1544 if (vs->name_idx < vs->nwnames) {
1545
1546 v9fs_string_sprintf(&vs->path, "%s/%s",
1547 vs->fidp->path.data, vs->wnames[vs->name_idx].data);
1548 v9fs_string_copy(&vs->fidp->path, &vs->path);
1549
1550 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1551 v9fs_walk_post_oldfid_lstat(s, vs, err);
1552 return;
1553 }
1554
1555 v9fs_string_free(&vs->path);
1556 v9fs_walk_marshal(vs);
1557 err = vs->offset;
1558 out:
1559 v9fs_walk_complete(s, vs, err);
1560 }
1561
1562 static void v9fs_walk(V9fsState *s, V9fsPDU *pdu)
1563 {
1564 int32_t fid, newfid;
1565 V9fsWalkState *vs;
1566 int err = 0;
1567 int i;
1568
1569 vs = qemu_malloc(sizeof(*vs));
1570 vs->pdu = pdu;
1571 vs->wnames = NULL;
1572 vs->qids = NULL;
1573 vs->offset = 7;
1574
1575 vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &fid,
1576 &newfid, &vs->nwnames);
1577
1578 if (vs->nwnames) {
1579 vs->wnames = qemu_mallocz(sizeof(vs->wnames[0]) * vs->nwnames);
1580
1581 vs->qids = qemu_mallocz(sizeof(vs->qids[0]) * vs->nwnames);
1582
1583 for (i = 0; i < vs->nwnames; i++) {
1584 vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s",
1585 &vs->wnames[i]);
1586 }
1587 }
1588
1589 vs->fidp = lookup_fid(s, fid);
1590 if (vs->fidp == NULL) {
1591 err = -ENOENT;
1592 goto out;
1593 }
1594
1595 /* FIXME: is this really valid? */
1596 if (fid == newfid) {
1597
1598 BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
1599 v9fs_string_init(&vs->path);
1600 vs->name_idx = 0;
1601
1602 if (vs->name_idx < vs->nwnames) {
1603 v9fs_string_sprintf(&vs->path, "%s/%s",
1604 vs->fidp->path.data, vs->wnames[vs->name_idx].data);
1605 v9fs_string_copy(&vs->fidp->path, &vs->path);
1606
1607 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1608 v9fs_walk_post_oldfid_lstat(s, vs, err);
1609 return;
1610 }
1611 } else {
1612 vs->newfidp = alloc_fid(s, newfid);
1613 if (vs->newfidp == NULL) {
1614 err = -EINVAL;
1615 goto out;
1616 }
1617
1618 vs->newfidp->uid = vs->fidp->uid;
1619 v9fs_string_init(&vs->path);
1620 vs->name_idx = 0;
1621 v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path);
1622
1623 if (vs->name_idx < vs->nwnames) {
1624 v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
1625 vs->wnames[vs->name_idx].data);
1626 v9fs_string_copy(&vs->newfidp->path, &vs->path);
1627
1628 err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
1629 v9fs_walk_post_newfid_lstat(s, vs, err);
1630 return;
1631 }
1632 }
1633
1634 v9fs_walk_marshal(vs);
1635 err = vs->offset;
1636 out:
1637 v9fs_walk_complete(s, vs, err);
1638 }
1639
1640 static int32_t get_iounit(V9fsState *s, V9fsString *name)
1641 {
1642 struct statfs stbuf;
1643 int32_t iounit = 0;
1644
1645 /*
1646 * iounit should be multiples of f_bsize (host filesystem block size
1647 * and as well as less than (client msize - P9_IOHDRSZ))
1648 */
1649 if (!v9fs_do_statfs(s, name, &stbuf)) {
1650 iounit = stbuf.f_bsize;
1651 iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
1652 }
1653
1654 if (!iounit) {
1655 iounit = s->msize - P9_IOHDRSZ;
1656 }
1657 return iounit;
1658 }
1659
1660 static void v9fs_open_post_opendir(V9fsState *s, V9fsOpenState *vs, int err)
1661 {
1662 if (vs->fidp->fs.dir == NULL) {
1663 err = -errno;
1664 goto out;
1665 }
1666 vs->fidp->fid_type = P9_FID_DIR;
1667 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0);
1668 err = vs->offset;
1669 out:
1670 complete_pdu(s, vs->pdu, err);
1671 qemu_free(vs);
1672
1673 }
1674
1675 static void v9fs_open_post_getiounit(V9fsState *s, V9fsOpenState *vs)
1676 {
1677 int err;
1678 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, vs->iounit);
1679 err = vs->offset;
1680 complete_pdu(s, vs->pdu, err);
1681 qemu_free(vs);
1682 }
1683
1684 static void v9fs_open_post_open(V9fsState *s, V9fsOpenState *vs, int err)
1685 {
1686 if (vs->fidp->fs.fd == -1) {
1687 err = -errno;
1688 goto out;
1689 }
1690 vs->fidp->fid_type = P9_FID_FILE;
1691 vs->iounit = get_iounit(s, &vs->fidp->path);
1692 v9fs_open_post_getiounit(s, vs);
1693 return;
1694 out:
1695 complete_pdu(s, vs->pdu, err);
1696 qemu_free(vs);
1697 }
1698
1699 static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err)
1700 {
1701 int flags;
1702
1703 if (err) {
1704 err = -errno;
1705 goto out;
1706 }
1707
1708 stat_to_qid(&vs->stbuf, &vs->qid);
1709
1710 if (S_ISDIR(vs->stbuf.st_mode)) {
1711 vs->fidp->fs.dir = v9fs_do_opendir(s, &vs->fidp->path);
1712 v9fs_open_post_opendir(s, vs, err);
1713 } else {
1714 if (s->proto_version == V9FS_PROTO_2000L) {
1715 flags = vs->mode;
1716 flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
1717 /* Ignore direct disk access hint until the server supports it. */
1718 flags &= ~O_DIRECT;
1719 } else {
1720 flags = omode_to_uflags(vs->mode);
1721 }
1722 vs->fidp->fs.fd = v9fs_do_open(s, &vs->fidp->path, flags);
1723 v9fs_open_post_open(s, vs, err);
1724 }
1725 return;
1726 out:
1727 complete_pdu(s, vs->pdu, err);
1728 qemu_free(vs);
1729 }
1730
1731 static void v9fs_open(V9fsState *s, V9fsPDU *pdu)
1732 {
1733 int32_t fid;
1734 V9fsOpenState *vs;
1735 ssize_t err = 0;
1736
1737 vs = qemu_malloc(sizeof(*vs));
1738 vs->pdu = pdu;
1739 vs->offset = 7;
1740 vs->mode = 0;
1741
1742 if (s->proto_version == V9FS_PROTO_2000L) {
1743 pdu_unmarshal(vs->pdu, vs->offset, "dd", &fid, &vs->mode);
1744 } else {
1745 pdu_unmarshal(vs->pdu, vs->offset, "db", &fid, &vs->mode);
1746 }
1747
1748 vs->fidp = lookup_fid(s, fid);
1749 if (vs->fidp == NULL) {
1750 err = -ENOENT;
1751 goto out;
1752 }
1753
1754 BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
1755
1756 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1757
1758 v9fs_open_post_lstat(s, vs, err);
1759 return;
1760 out:
1761 complete_pdu(s, pdu, err);
1762 qemu_free(vs);
1763 }
1764
1765 static void v9fs_post_lcreate(V9fsState *s, V9fsLcreateState *vs, int err)
1766 {
1767 if (err == 0) {
1768 v9fs_string_copy(&vs->fidp->path, &vs->fullname);
1769 stat_to_qid(&vs->stbuf, &vs->qid);
1770 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid,
1771 &vs->iounit);
1772 err = vs->offset;
1773 } else {
1774 vs->fidp->fid_type = P9_FID_NONE;
1775 err = -errno;
1776 if (vs->fidp->fs.fd > 0) {
1777 close(vs->fidp->fs.fd);
1778 }
1779 }
1780
1781 complete_pdu(s, vs->pdu, err);
1782 v9fs_string_free(&vs->name);
1783 v9fs_string_free(&vs->fullname);
1784 qemu_free(vs);
1785 }
1786
1787 static void v9fs_lcreate_post_get_iounit(V9fsState *s, V9fsLcreateState *vs,
1788 int err)
1789 {
1790 if (err) {
1791 err = -errno;
1792 goto out;
1793 }
1794 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
1795
1796 out:
1797 v9fs_post_lcreate(s, vs, err);
1798 }
1799
1800 static void v9fs_lcreate_post_do_open2(V9fsState *s, V9fsLcreateState *vs,
1801 int err)
1802 {
1803 if (vs->fidp->fs.fd == -1) {
1804 err = -errno;
1805 goto out;
1806 }
1807 vs->fidp->fid_type = P9_FID_FILE;
1808 vs->iounit = get_iounit(s, &vs->fullname);
1809 v9fs_lcreate_post_get_iounit(s, vs, err);
1810 return;
1811
1812 out:
1813 v9fs_post_lcreate(s, vs, err);
1814 }
1815
1816 static void v9fs_lcreate(V9fsState *s, V9fsPDU *pdu)
1817 {
1818 int32_t dfid, flags, mode;
1819 gid_t gid;
1820 V9fsLcreateState *vs;
1821 ssize_t err = 0;
1822
1823 vs = qemu_malloc(sizeof(*vs));
1824 vs->pdu = pdu;
1825 vs->offset = 7;
1826
1827 v9fs_string_init(&vs->fullname);
1828
1829 pdu_unmarshal(vs->pdu, vs->offset, "dsddd", &dfid, &vs->name, &flags,
1830 &mode, &gid);
1831
1832 vs->fidp = lookup_fid(s, dfid);
1833 if (vs->fidp == NULL) {
1834 err = -ENOENT;
1835 goto out;
1836 }
1837
1838 v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
1839 vs->name.data);
1840
1841 /* Ignore direct disk access hint until the server supports it. */
1842 flags &= ~O_DIRECT;
1843
1844 vs->fidp->fs.fd = v9fs_do_open2(s, vs->fullname.data, vs->fidp->uid,
1845 gid, flags, mode);
1846 v9fs_lcreate_post_do_open2(s, vs, err);
1847 return;
1848
1849 out:
1850 complete_pdu(s, vs->pdu, err);
1851 v9fs_string_free(&vs->name);
1852 qemu_free(vs);
1853 }
1854
1855 static void v9fs_post_do_fsync(V9fsState *s, V9fsPDU *pdu, int err)
1856 {
1857 if (err == -1) {
1858 err = -errno;
1859 }
1860 complete_pdu(s, pdu, err);
1861 }
1862
1863 static void v9fs_fsync(V9fsState *s, V9fsPDU *pdu)
1864 {
1865 int32_t fid;
1866 size_t offset = 7;
1867 V9fsFidState *fidp;
1868 int datasync;
1869 int err;
1870
1871 pdu_unmarshal(pdu, offset, "dd", &fid, &datasync);
1872 fidp = lookup_fid(s, fid);
1873 if (fidp == NULL) {
1874 err = -ENOENT;
1875 v9fs_post_do_fsync(s, pdu, err);
1876 return;
1877 }
1878 err = v9fs_do_fsync(s, fidp->fs.fd, datasync);
1879 v9fs_post_do_fsync(s, pdu, err);
1880 }
1881
1882 static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu)
1883 {
1884 int32_t fid;
1885 size_t offset = 7;
1886 int err;
1887
1888 pdu_unmarshal(pdu, offset, "d", &fid);
1889
1890 err = free_fid(s, fid);
1891 if (err < 0) {
1892 goto out;
1893 }
1894
1895 offset = 7;
1896 err = offset;
1897 out:
1898 complete_pdu(s, pdu, err);
1899 }
1900
1901 static void v9fs_read_post_readdir(V9fsState *, V9fsReadState *, ssize_t);
1902
1903 static void v9fs_read_post_seekdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1904 {
1905 if (err) {
1906 goto out;
1907 }
1908 v9fs_stat_free(&vs->v9stat);
1909 v9fs_string_free(&vs->name);
1910 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
1911 vs->offset += vs->count;
1912 err = vs->offset;
1913 out:
1914 complete_pdu(s, vs->pdu, err);
1915 qemu_free(vs);
1916 return;
1917 }
1918
1919 static void v9fs_read_post_dir_lstat(V9fsState *s, V9fsReadState *vs,
1920 ssize_t err)
1921 {
1922 if (err) {
1923 err = -errno;
1924 goto out;
1925 }
1926 err = stat_to_v9stat(s, &vs->name, &vs->stbuf, &vs->v9stat);
1927 if (err) {
1928 goto out;
1929 }
1930
1931 vs->len = pdu_marshal(vs->pdu, vs->offset + 4 + vs->count, "S",
1932 &vs->v9stat);
1933 if ((vs->len != (vs->v9stat.size + 2)) ||
1934 ((vs->count + vs->len) > vs->max_count)) {
1935 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->dir_pos);
1936 v9fs_read_post_seekdir(s, vs, err);
1937 return;
1938 }
1939 vs->count += vs->len;
1940 v9fs_stat_free(&vs->v9stat);
1941 v9fs_string_free(&vs->name);
1942 vs->dir_pos = vs->dent->d_off;
1943 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
1944 v9fs_read_post_readdir(s, vs, err);
1945 return;
1946 out:
1947 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->dir_pos);
1948 v9fs_read_post_seekdir(s, vs, err);
1949 return;
1950
1951 }
1952
1953 static void v9fs_read_post_readdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1954 {
1955 if (vs->dent) {
1956 memset(&vs->v9stat, 0, sizeof(vs->v9stat));
1957 v9fs_string_init(&vs->name);
1958 v9fs_string_sprintf(&vs->name, "%s/%s", vs->fidp->path.data,
1959 vs->dent->d_name);
1960 err = v9fs_do_lstat(s, &vs->name, &vs->stbuf);
1961 v9fs_read_post_dir_lstat(s, vs, err);
1962 return;
1963 }
1964
1965 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
1966 vs->offset += vs->count;
1967 err = vs->offset;
1968 complete_pdu(s, vs->pdu, err);
1969 qemu_free(vs);
1970 return;
1971 }
1972
1973 static void v9fs_read_post_telldir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1974 {
1975 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
1976 v9fs_read_post_readdir(s, vs, err);
1977 return;
1978 }
1979
1980 static void v9fs_read_post_rewinddir(V9fsState *s, V9fsReadState *vs,
1981 ssize_t err)
1982 {
1983 vs->dir_pos = v9fs_do_telldir(s, vs->fidp->fs.dir);
1984 v9fs_read_post_telldir(s, vs, err);
1985 return;
1986 }
1987
1988 static void v9fs_read_post_preadv(V9fsState *s, V9fsReadState *vs, ssize_t err)
1989 {
1990 if (err < 0) {
1991 /* IO error return the error */
1992 err = -errno;
1993 goto out;
1994 }
1995 vs->total += vs->len;
1996 vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
1997 if (vs->total < vs->count && vs->len > 0) {
1998 do {
1999 if (0) {
2000 print_sg(vs->sg, vs->cnt);
2001 }
2002 vs->len = v9fs_do_preadv(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2003 vs->off);
2004 if (vs->len > 0) {
2005 vs->off += vs->len;
2006 }
2007 } while (vs->len == -1 && errno == EINTR);
2008 if (vs->len == -1) {
2009 err = -errno;
2010 }
2011 v9fs_read_post_preadv(s, vs, err);
2012 return;
2013 }
2014 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
2015 vs->offset += vs->count;
2016 err = vs->offset;
2017
2018 out:
2019 complete_pdu(s, vs->pdu, err);
2020 qemu_free(vs);
2021 }
2022
2023 static void v9fs_xattr_read(V9fsState *s, V9fsReadState *vs)
2024 {
2025 ssize_t err = 0;
2026 int read_count;
2027 int64_t xattr_len;
2028
2029 xattr_len = vs->fidp->fs.xattr.len;
2030 read_count = xattr_len - vs->off;
2031 if (read_count > vs->count) {
2032 read_count = vs->count;
2033 } else if (read_count < 0) {
2034 /*
2035 * read beyond XATTR value
2036 */
2037 read_count = 0;
2038 }
2039 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", read_count);
2040 vs->offset += pdu_pack(vs->pdu, vs->offset,
2041 ((char *)vs->fidp->fs.xattr.value) + vs->off,
2042 read_count);
2043 err = vs->offset;
2044 complete_pdu(s, vs->pdu, err);
2045 qemu_free(vs);
2046 }
2047
2048 static void v9fs_read(V9fsState *s, V9fsPDU *pdu)
2049 {
2050 int32_t fid;
2051 V9fsReadState *vs;
2052 ssize_t err = 0;
2053
2054 vs = qemu_malloc(sizeof(*vs));
2055 vs->pdu = pdu;
2056 vs->offset = 7;
2057 vs->total = 0;
2058 vs->len = 0;
2059 vs->count = 0;
2060
2061 pdu_unmarshal(vs->pdu, vs->offset, "dqd", &fid, &vs->off, &vs->count);
2062
2063 vs->fidp = lookup_fid(s, fid);
2064 if (vs->fidp == NULL) {
2065 err = -EINVAL;
2066 goto out;
2067 }
2068
2069 if (vs->fidp->fid_type == P9_FID_DIR) {
2070 vs->max_count = vs->count;
2071 vs->count = 0;
2072 if (vs->off == 0) {
2073 v9fs_do_rewinddir(s, vs->fidp->fs.dir);
2074 }
2075 v9fs_read_post_rewinddir(s, vs, err);
2076 return;
2077 } else if (vs->fidp->fid_type == P9_FID_FILE) {
2078 vs->sg = vs->iov;
2079 pdu_marshal(vs->pdu, vs->offset + 4, "v", vs->sg, &vs->cnt);
2080 vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
2081 if (vs->total <= vs->count) {
2082 vs->len = v9fs_do_preadv(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2083 vs->off);
2084 if (vs->len > 0) {
2085 vs->off += vs->len;
2086 }
2087 err = vs->len;
2088 v9fs_read_post_preadv(s, vs, err);
2089 }
2090 return;
2091 } else if (vs->fidp->fid_type == P9_FID_XATTR) {
2092 v9fs_xattr_read(s, vs);
2093 return;
2094 } else {
2095 err = -EINVAL;
2096 }
2097 out:
2098 complete_pdu(s, pdu, err);
2099 qemu_free(vs);
2100 }
2101
2102 typedef struct V9fsReadDirState {
2103 V9fsPDU *pdu;
2104 V9fsFidState *fidp;
2105 V9fsQID qid;
2106 off_t saved_dir_pos;
2107 struct dirent *dent;
2108 int32_t count;
2109 int32_t max_count;
2110 size_t offset;
2111 int64_t initial_offset;
2112 V9fsString name;
2113 } V9fsReadDirState;
2114
2115 static void v9fs_readdir_post_seekdir(V9fsState *s, V9fsReadDirState *vs)
2116 {
2117 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
2118 vs->offset += vs->count;
2119 complete_pdu(s, vs->pdu, vs->offset);
2120 qemu_free(vs);
2121 return;
2122 }
2123
2124 /* Size of each dirent on the wire: size of qid (13) + size of offset (8)
2125 * size of type (1) + size of name.size (2) + strlen(name.data)
2126 */
2127 #define V9_READDIR_DATA_SZ (24 + strlen(vs->name.data))
2128
2129 static void v9fs_readdir_post_readdir(V9fsState *s, V9fsReadDirState *vs)
2130 {
2131 int len;
2132 size_t size;
2133
2134 if (vs->dent) {
2135 v9fs_string_init(&vs->name);
2136 v9fs_string_sprintf(&vs->name, "%s", vs->dent->d_name);
2137
2138 if ((vs->count + V9_READDIR_DATA_SZ) > vs->max_count) {
2139 /* Ran out of buffer. Set dir back to old position and return */
2140 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->saved_dir_pos);
2141 v9fs_readdir_post_seekdir(s, vs);
2142 return;
2143 }
2144
2145 /* Fill up just the path field of qid because the client uses
2146 * only that. To fill the entire qid structure we will have
2147 * to stat each dirent found, which is expensive
2148 */
2149 size = MIN(sizeof(vs->dent->d_ino), sizeof(vs->qid.path));
2150 memcpy(&vs->qid.path, &vs->dent->d_ino, size);
2151 /* Fill the other fields with dummy values */
2152 vs->qid.type = 0;
2153 vs->qid.version = 0;
2154
2155 len = pdu_marshal(vs->pdu, vs->offset+4+vs->count, "Qqbs",
2156 &vs->qid, vs->dent->d_off,
2157 vs->dent->d_type, &vs->name);
2158 vs->count += len;
2159 v9fs_string_free(&vs->name);
2160 vs->saved_dir_pos = vs->dent->d_off;
2161 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
2162 v9fs_readdir_post_readdir(s, vs);
2163 return;
2164 }
2165
2166 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
2167 vs->offset += vs->count;
2168 complete_pdu(s, vs->pdu, vs->offset);
2169 qemu_free(vs);
2170 return;
2171 }
2172
2173 static void v9fs_readdir_post_telldir(V9fsState *s, V9fsReadDirState *vs)
2174 {
2175 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
2176 v9fs_readdir_post_readdir(s, vs);
2177 return;
2178 }
2179
2180 static void v9fs_readdir_post_setdir(V9fsState *s, V9fsReadDirState *vs)
2181 {
2182 vs->saved_dir_pos = v9fs_do_telldir(s, vs->fidp->fs.dir);
2183 v9fs_readdir_post_telldir(s, vs);
2184 return;
2185 }
2186
2187 static void v9fs_readdir(V9fsState *s, V9fsPDU *pdu)
2188 {
2189 int32_t fid;
2190 V9fsReadDirState *vs;
2191 ssize_t err = 0;
2192 size_t offset = 7;
2193
2194 vs = qemu_malloc(sizeof(*vs));
2195 vs->pdu = pdu;
2196 vs->offset = 7;
2197 vs->count = 0;
2198
2199 pdu_unmarshal(vs->pdu, offset, "dqd", &fid, &vs->initial_offset,
2200 &vs->max_count);
2201
2202 vs->fidp = lookup_fid(s, fid);
2203 if (vs->fidp == NULL || !(vs->fidp->fs.dir)) {
2204 err = -EINVAL;
2205 goto out;
2206 }
2207
2208 if (vs->initial_offset == 0) {
2209 v9fs_do_rewinddir(s, vs->fidp->fs.dir);
2210 } else {
2211 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->initial_offset);
2212 }
2213
2214 v9fs_readdir_post_setdir(s, vs);
2215 return;
2216
2217 out:
2218 complete_pdu(s, pdu, err);
2219 qemu_free(vs);
2220 return;
2221 }
2222
2223 static void v9fs_write_post_pwritev(V9fsState *s, V9fsWriteState *vs,
2224 ssize_t err)
2225 {
2226 if (err < 0) {
2227 /* IO error return the error */
2228 err = -errno;
2229 goto out;
2230 }
2231 vs->total += vs->len;
2232 vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
2233 if (vs->total < vs->count && vs->len > 0) {
2234 do {
2235 if (0) {
2236 print_sg(vs->sg, vs->cnt);
2237 }
2238 vs->len = v9fs_do_pwritev(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2239 vs->off);
2240 if (vs->len > 0) {
2241 vs->off += vs->len;
2242 }
2243 } while (vs->len == -1 && errno == EINTR);
2244 if (vs->len == -1) {
2245 err = -errno;
2246 }
2247 v9fs_write_post_pwritev(s, vs, err);
2248 return;
2249 }
2250 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
2251 err = vs->offset;
2252 out:
2253 complete_pdu(s, vs->pdu, err);
2254 qemu_free(vs);
2255 }
2256
2257 static void v9fs_xattr_write(V9fsState *s, V9fsWriteState *vs)
2258 {
2259 int i, to_copy;
2260 ssize_t err = 0;
2261 int write_count;
2262 int64_t xattr_len;
2263
2264 xattr_len = vs->fidp->fs.xattr.len;
2265 write_count = xattr_len - vs->off;
2266 if (write_count > vs->count) {
2267 write_count = vs->count;
2268 } else if (write_count < 0) {
2269 /*
2270 * write beyond XATTR value len specified in
2271 * xattrcreate
2272 */
2273 err = -ENOSPC;
2274 goto out;
2275 }
2276 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", write_count);
2277 err = vs->offset;
2278 vs->fidp->fs.xattr.copied_len += write_count;
2279 /*
2280 * Now copy the content from sg list
2281 */
2282 for (i = 0; i < vs->cnt; i++) {
2283 if (write_count > vs->sg[i].iov_len) {
2284 to_copy = vs->sg[i].iov_len;
2285 } else {
2286 to_copy = write_count;
2287 }
2288 memcpy((char *)vs->fidp->fs.xattr.value + vs->off,
2289 vs->sg[i].iov_base, to_copy);
2290 /* updating vs->off since we are not using below */
2291 vs->off += to_copy;
2292 write_count -= to_copy;
2293 }
2294 out:
2295 complete_pdu(s, vs->pdu, err);
2296 qemu_free(vs);
2297 }
2298
2299 static void v9fs_write(V9fsState *s, V9fsPDU *pdu)
2300 {
2301 int32_t fid;
2302 V9fsWriteState *vs;
2303 ssize_t err;
2304
2305 vs = qemu_malloc(sizeof(*vs));
2306
2307 vs->pdu = pdu;
2308 vs->offset = 7;
2309 vs->sg = vs->iov;
2310 vs->total = 0;
2311 vs->len = 0;
2312
2313 pdu_unmarshal(vs->pdu, vs->offset, "dqdv", &fid, &vs->off, &vs->count,
2314 vs->sg, &vs->cnt);
2315
2316 vs->fidp = lookup_fid(s, fid);
2317 if (vs->fidp == NULL) {
2318 err = -EINVAL;
2319 goto out;
2320 }
2321
2322 if (vs->fidp->fid_type == P9_FID_FILE) {
2323 if (vs->fidp->fs.fd == -1) {
2324 err = -EINVAL;
2325 goto out;
2326 }
2327 } else if (vs->fidp->fid_type == P9_FID_XATTR) {
2328 /*
2329 * setxattr operation
2330 */
2331 v9fs_xattr_write(s, vs);
2332 return;
2333 } else {
2334 err = -EINVAL;
2335 goto out;
2336 }
2337 vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
2338 if (vs->total <= vs->count) {
2339 vs->len = v9fs_do_pwritev(s, vs->fidp->fs.fd, vs->sg, vs->cnt, vs->off);
2340 if (vs->len > 0) {
2341 vs->off += vs->len;
2342 }
2343 err = vs->len;
2344 v9fs_write_post_pwritev(s, vs, err);
2345 }
2346 return;
2347 out:
2348 complete_pdu(s, vs->pdu, err);
2349 qemu_free(vs);
2350 }
2351
2352 static void v9fs_create_post_getiounit(V9fsState *s, V9fsCreateState *vs)
2353 {
2354 int err;
2355 v9fs_string_copy(&vs->fidp->path, &vs->fullname);
2356 stat_to_qid(&vs->stbuf, &vs->qid);
2357
2358 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, vs->iounit);
2359 err = vs->offset;
2360
2361 complete_pdu(s, vs->pdu, err);
2362 v9fs_string_free(&vs->name);
2363 v9fs_string_free(&vs->extension);
2364 v9fs_string_free(&vs->fullname);
2365 qemu_free(vs);
2366 }
2367
2368 static void v9fs_post_create(V9fsState *s, V9fsCreateState *vs, int err)
2369 {
2370 if (err == 0) {
2371 vs->iounit = get_iounit(s, &vs->fidp->path);
2372 v9fs_create_post_getiounit(s, vs);
2373 return;
2374 }
2375
2376 complete_pdu(s, vs->pdu, err);
2377 v9fs_string_free(&vs->name);
2378 v9fs_string_free(&vs->extension);
2379 v9fs_string_free(&vs->fullname);
2380 qemu_free(vs);
2381 }
2382
2383 static void v9fs_create_post_perms(V9fsState *s, V9fsCreateState *vs, int err)
2384 {
2385 if (err) {
2386 err = -errno;
2387 }
2388 v9fs_post_create(s, vs, err);
2389 }
2390
2391 static void v9fs_create_post_opendir(V9fsState *s, V9fsCreateState *vs,
2392 int err)
2393 {
2394 if (!vs->fidp->fs.dir) {
2395 err = -errno;
2396 }
2397 vs->fidp->fid_type = P9_FID_DIR;
2398 v9fs_post_create(s, vs, err);
2399 }
2400
2401 static void v9fs_create_post_dir_lstat(V9fsState *s, V9fsCreateState *vs,
2402 int err)
2403 {
2404 if (err) {
2405 err = -errno;
2406 goto out;
2407 }
2408
2409 vs->fidp->fs.dir = v9fs_do_opendir(s, &vs->fullname);
2410 v9fs_create_post_opendir(s, vs, err);
2411 return;
2412
2413 out:
2414 v9fs_post_create(s, vs, err);
2415 }
2416
2417 static void v9fs_create_post_mkdir(V9fsState *s, V9fsCreateState *vs, int err)
2418 {
2419 if (err) {
2420 err = -errno;
2421 goto out;
2422 }
2423
2424 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2425 v9fs_create_post_dir_lstat(s, vs, err);
2426 return;
2427
2428 out:
2429 v9fs_post_create(s, vs, err);
2430 }
2431
2432 static void v9fs_create_post_fstat(V9fsState *s, V9fsCreateState *vs, int err)
2433 {
2434 if (err) {
2435 vs->fidp->fid_type = P9_FID_NONE;
2436 close(vs->fidp->fs.fd);
2437 err = -errno;
2438 }
2439 v9fs_post_create(s, vs, err);
2440 return;
2441 }
2442
2443 static void v9fs_create_post_open2(V9fsState *s, V9fsCreateState *vs, int err)
2444 {
2445 if (vs->fidp->fs.fd == -1) {
2446 err = -errno;
2447 goto out;
2448 }
2449 vs->fidp->fid_type = P9_FID_FILE;
2450 err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
2451 v9fs_create_post_fstat(s, vs, err);
2452
2453 return;
2454
2455 out:
2456 v9fs_post_create(s, vs, err);
2457
2458 }
2459
2460 static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
2461 {
2462
2463 if (err == 0 || errno != ENOENT) {
2464 err = -errno;
2465 goto out;
2466 }
2467
2468 if (vs->perm & P9_STAT_MODE_DIR) {
2469 err = v9fs_do_mkdir(s, vs->fullname.data, vs->perm & 0777,
2470 vs->fidp->uid, -1);
2471 v9fs_create_post_mkdir(s, vs, err);
2472 } else if (vs->perm & P9_STAT_MODE_SYMLINK) {
2473 err = v9fs_do_symlink(s, vs->fidp, vs->extension.data,
2474 vs->fullname.data, -1);
2475 v9fs_create_post_perms(s, vs, err);
2476 } else if (vs->perm & P9_STAT_MODE_LINK) {
2477 int32_t nfid = atoi(vs->extension.data);
2478 V9fsFidState *nfidp = lookup_fid(s, nfid);
2479 if (nfidp == NULL) {
2480 err = -errno;
2481 v9fs_post_create(s, vs, err);
2482 }
2483 err = v9fs_do_link(s, &nfidp->path, &vs->fullname);
2484 v9fs_create_post_perms(s, vs, err);
2485 } else if (vs->perm & P9_STAT_MODE_DEVICE) {
2486 char ctype;
2487 uint32_t major, minor;
2488 mode_t nmode = 0;
2489
2490 if (sscanf(vs->extension.data, "%c %u %u", &ctype, &major,
2491 &minor) != 3) {
2492 err = -errno;
2493 v9fs_post_create(s, vs, err);
2494 }
2495
2496 switch (ctype) {
2497 case 'c':
2498 nmode = S_IFCHR;
2499 break;
2500 case 'b':
2501 nmode = S_IFBLK;
2502 break;
2503 default:
2504 err = -EIO;
2505 v9fs_post_create(s, vs, err);
2506 }
2507
2508 nmode |= vs->perm & 0777;
2509 err = v9fs_do_mknod(s, vs->fullname.data, nmode,
2510 makedev(major, minor), vs->fidp->uid, -1);
2511 v9fs_create_post_perms(s, vs, err);
2512 } else if (vs->perm & P9_STAT_MODE_NAMED_PIPE) {
2513 err = v9fs_do_mknod(s, vs->fullname.data, S_IFIFO | (vs->perm & 0777),
2514 0, vs->fidp->uid, -1);
2515 v9fs_post_create(s, vs, err);
2516 } else if (vs->perm & P9_STAT_MODE_SOCKET) {
2517 err = v9fs_do_mknod(s, vs->fullname.data, S_IFSOCK | (vs->perm & 0777),
2518 0, vs->fidp->uid, -1);
2519 v9fs_post_create(s, vs, err);
2520 } else {
2521 vs->fidp->fs.fd = v9fs_do_open2(s, vs->fullname.data, vs->fidp->uid,
2522 -1, omode_to_uflags(vs->mode)|O_CREAT, vs->perm);
2523
2524 v9fs_create_post_open2(s, vs, err);
2525 }
2526
2527 return;
2528
2529 out:
2530 v9fs_post_create(s, vs, err);
2531 }
2532
2533 static void v9fs_create(V9fsState *s, V9fsPDU *pdu)
2534 {
2535 int32_t fid;
2536 V9fsCreateState *vs;
2537 int err = 0;
2538
2539 vs = qemu_malloc(sizeof(*vs));
2540 vs->pdu = pdu;
2541 vs->offset = 7;
2542
2543 v9fs_string_init(&vs->fullname);
2544
2545 pdu_unmarshal(vs->pdu, vs->offset, "dsdbs", &fid, &vs->name,
2546 &vs->perm, &vs->mode, &vs->extension);
2547
2548 vs->fidp = lookup_fid(s, fid);
2549 if (vs->fidp == NULL) {
2550 err = -EINVAL;
2551 goto out;
2552 }
2553
2554 v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
2555 vs->name.data);
2556
2557 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2558 v9fs_create_post_lstat(s, vs, err);
2559 return;
2560
2561 out:
2562 complete_pdu(s, vs->pdu, err);
2563 v9fs_string_free(&vs->name);
2564 v9fs_string_free(&vs->extension);
2565 qemu_free(vs);
2566 }
2567
2568 static void v9fs_post_symlink(V9fsState *s, V9fsSymlinkState *vs, int err)
2569 {
2570 if (err == 0) {
2571 stat_to_qid(&vs->stbuf, &vs->qid);
2572 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
2573 err = vs->offset;
2574 } else {
2575 err = -errno;
2576 }
2577 complete_pdu(s, vs->pdu, err);
2578 v9fs_string_free(&vs->name);
2579 v9fs_string_free(&vs->symname);
2580 v9fs_string_free(&vs->fullname);
2581 qemu_free(vs);
2582 }
2583
2584 static void v9fs_symlink_post_do_symlink(V9fsState *s, V9fsSymlinkState *vs,
2585 int err)
2586 {
2587 if (err) {
2588 goto out;
2589 }
2590 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2591 out:
2592 v9fs_post_symlink(s, vs, err);
2593 }
2594
2595 static void v9fs_symlink(V9fsState *s, V9fsPDU *pdu)
2596 {
2597 int32_t dfid;
2598 V9fsSymlinkState *vs;
2599 int err = 0;
2600 gid_t gid;
2601
2602 vs = qemu_malloc(sizeof(*vs));
2603 vs->pdu = pdu;
2604 vs->offset = 7;
2605
2606 v9fs_string_init(&vs->fullname);
2607
2608 pdu_unmarshal(vs->pdu, vs->offset, "dssd", &dfid, &vs->name,
2609 &vs->symname, &gid);
2610
2611 vs->dfidp = lookup_fid(s, dfid);
2612 if (vs->dfidp == NULL) {
2613 err = -EINVAL;
2614 goto out;
2615 }
2616
2617 v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->dfidp->path.data,
2618 vs->name.data);
2619 err = v9fs_do_symlink(s, vs->dfidp, vs->symname.data,
2620 vs->fullname.data, gid);
2621 v9fs_symlink_post_do_symlink(s, vs, err);
2622 return;
2623
2624 out:
2625 complete_pdu(s, vs->pdu, err);
2626 v9fs_string_free(&vs->name);
2627 v9fs_string_free(&vs->symname);
2628 qemu_free(vs);
2629 }
2630
2631 static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)
2632 {
2633 /* A nop call with no return */
2634 complete_pdu(s, pdu, 7);
2635 }
2636
2637 static void v9fs_link(V9fsState *s, V9fsPDU *pdu)
2638 {
2639 int32_t dfid, oldfid;
2640 V9fsFidState *dfidp, *oldfidp;
2641 V9fsString name, fullname;
2642 size_t offset = 7;
2643 int err = 0;
2644
2645 v9fs_string_init(&fullname);
2646
2647 pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name);
2648
2649 dfidp = lookup_fid(s, dfid);
2650 if (dfidp == NULL) {
2651 err = -errno;
2652 goto out;
2653 }
2654
2655 oldfidp = lookup_fid(s, oldfid);
2656 if (oldfidp == NULL) {
2657 err = -errno;
2658 goto out;
2659 }
2660
2661 v9fs_string_sprintf(&fullname, "%s/%s", dfidp->path.data, name.data);
2662 err = offset;
2663 err = v9fs_do_link(s, &oldfidp->path, &fullname);
2664 if (err) {
2665 err = -errno;
2666 }
2667 v9fs_string_free(&fullname);
2668
2669 out:
2670 v9fs_string_free(&name);
2671 complete_pdu(s, pdu, err);
2672 }
2673
2674 static void v9fs_remove_post_remove(V9fsState *s, V9fsRemoveState *vs,
2675 int err)
2676 {
2677 if (err < 0) {
2678 err = -errno;
2679 } else {
2680 err = vs->offset;
2681 }
2682
2683 /* For TREMOVE we need to clunk the fid even on failed remove */
2684 free_fid(s, vs->fidp->fid);
2685
2686 complete_pdu(s, vs->pdu, err);
2687 qemu_free(vs);
2688 }
2689
2690 static void v9fs_remove(V9fsState *s, V9fsPDU *pdu)
2691 {
2692 int32_t fid;
2693 V9fsRemoveState *vs;
2694 int err = 0;
2695
2696 vs = qemu_malloc(sizeof(*vs));
2697 vs->pdu = pdu;
2698 vs->offset = 7;
2699
2700 pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
2701
2702 vs->fidp = lookup_fid(s, fid);
2703 if (vs->fidp == NULL) {
2704 err = -EINVAL;
2705 goto out;
2706 }
2707
2708 err = v9fs_do_remove(s, &vs->fidp->path);
2709 v9fs_remove_post_remove(s, vs, err);
2710 return;
2711
2712 out:
2713 complete_pdu(s, pdu, err);
2714 qemu_free(vs);
2715 }
2716
2717 static void v9fs_wstat_post_truncate(V9fsState *s, V9fsWstatState *vs, int err)
2718 {
2719 if (err < 0) {
2720 goto out;
2721 }
2722
2723 err = vs->offset;
2724
2725 out:
2726 v9fs_stat_free(&vs->v9stat);
2727 complete_pdu(s, vs->pdu, err);
2728 qemu_free(vs);
2729 }
2730
2731 static void v9fs_wstat_post_rename(V9fsState *s, V9fsWstatState *vs, int err)
2732 {
2733 if (err < 0) {
2734 goto out;
2735 }
2736 if (vs->v9stat.length != -1) {
2737 if (v9fs_do_truncate(s, &vs->fidp->path, vs->v9stat.length) < 0) {
2738 err = -errno;
2739 }
2740 }
2741 v9fs_wstat_post_truncate(s, vs, err);
2742 return;
2743
2744 out:
2745 v9fs_stat_free(&vs->v9stat);
2746 complete_pdu(s, vs->pdu, err);
2747 qemu_free(vs);
2748 }
2749
2750 static int v9fs_complete_rename(V9fsState *s, V9fsRenameState *vs)
2751 {
2752 int err = 0;
2753 char *old_name, *new_name;
2754 char *end;
2755
2756 if (vs->newdirfid != -1) {
2757 V9fsFidState *dirfidp;
2758 dirfidp = lookup_fid(s, vs->newdirfid);
2759
2760 if (dirfidp == NULL) {
2761 err = -ENOENT;
2762 goto out;
2763 }
2764
2765 BUG_ON(dirfidp->fid_type != P9_FID_NONE);
2766
2767 new_name = qemu_mallocz(dirfidp->path.size + vs->name.size + 2);
2768
2769 strcpy(new_name, dirfidp->path.data);
2770 strcat(new_name, "/");
2771 strcat(new_name + dirfidp->path.size, vs->name.data);
2772 } else {
2773 old_name = vs->fidp->path.data;
2774 end = strrchr(old_name, '/');
2775 if (end) {
2776 end++;
2777 } else {
2778 end = old_name;
2779 }
2780 new_name = qemu_mallocz(end - old_name + vs->name.size + 1);
2781
2782 strncat(new_name, old_name, end - old_name);
2783 strncat(new_name + (end - old_name), vs->name.data, vs->name.size);
2784 }
2785
2786 v9fs_string_free(&vs->name);
2787 vs->name.data = qemu_strdup(new_name);
2788 vs->name.size = strlen(new_name);
2789
2790 if (strcmp(new_name, vs->fidp->path.data) != 0) {
2791 if (v9fs_do_rename(s, &vs->fidp->path, &vs->name)) {
2792 err = -errno;
2793 } else {
2794 V9fsFidState *fidp;
2795 /*
2796 * Fixup fid's pointing to the old name to
2797 * start pointing to the new name
2798 */
2799 for (fidp = s->fid_list; fidp; fidp = fidp->next) {
2800 if (vs->fidp == fidp) {
2801 /*
2802 * we replace name of this fid towards the end
2803 * so that our below strcmp will work
2804 */
2805 continue;
2806 }
2807 if (!strncmp(vs->fidp->path.data, fidp->path.data,
2808 strlen(vs->fidp->path.data))) {
2809 /* replace the name */
2810 v9fs_fix_path(&fidp->path, &vs->name,
2811 strlen(vs->fidp->path.data));
2812 }
2813 }
2814 v9fs_string_copy(&vs->fidp->path, &vs->name);
2815 }
2816 }
2817 out:
2818 v9fs_string_free(&vs->name);
2819 return err;
2820 }
2821
2822 static void v9fs_rename_post_rename(V9fsState *s, V9fsRenameState *vs, int err)
2823 {
2824 complete_pdu(s, vs->pdu, err);
2825 qemu_free(vs);
2826 }
2827
2828 static void v9fs_wstat_post_chown(V9fsState *s, V9fsWstatState *vs, int err)
2829 {
2830 if (err < 0) {
2831 goto out;
2832 }
2833
2834 if (vs->v9stat.name.size != 0) {
2835 V9fsRenameState *vr;
2836
2837 vr = qemu_mallocz(sizeof(V9fsRenameState));
2838 vr->newdirfid = -1;
2839 vr->pdu = vs->pdu;
2840 vr->fidp = vs->fidp;
2841 vr->offset = vs->offset;
2842 vr->name.size = vs->v9stat.name.size;
2843 vr->name.data = qemu_strdup(vs->v9stat.name.data);
2844
2845 err = v9fs_complete_rename(s, vr);
2846 qemu_free(vr);
2847 }
2848 v9fs_wstat_post_rename(s, vs, err);
2849 return;
2850
2851 out:
2852 v9fs_stat_free(&vs->v9stat);
2853 complete_pdu(s, vs->pdu, err);
2854 qemu_free(vs);
2855 }
2856
2857 static void v9fs_rename(V9fsState *s, V9fsPDU *pdu)
2858 {
2859 int32_t fid;
2860 V9fsRenameState *vs;
2861 ssize_t err = 0;
2862
2863 vs = qemu_malloc(sizeof(*vs));
2864 vs->pdu = pdu;
2865 vs->offset = 7;
2866
2867 pdu_unmarshal(vs->pdu, vs->offset, "dds", &fid, &vs->newdirfid, &vs->name);
2868
2869 vs->fidp = lookup_fid(s, fid);
2870 if (vs->fidp == NULL) {
2871 err = -ENOENT;
2872 goto out;
2873 }
2874
2875 BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
2876
2877 err = v9fs_complete_rename(s, vs);
2878 v9fs_rename_post_rename(s, vs, err);
2879 return;
2880 out:
2881 complete_pdu(s, vs->pdu, err);
2882 qemu_free(vs);
2883 }
2884
2885 static void v9fs_wstat_post_utime(V9fsState *s, V9fsWstatState *vs, int err)
2886 {
2887 if (err < 0) {
2888 goto out;
2889 }
2890
2891 if (vs->v9stat.n_gid != -1 || vs->v9stat.n_uid != -1) {
2892 if (v9fs_do_chown(s, &vs->fidp->path, vs->v9stat.n_uid,
2893 vs->v9stat.n_gid)) {
2894 err = -errno;
2895 }
2896 }
2897 v9fs_wstat_post_chown(s, vs, err);
2898 return;
2899
2900 out:
2901 v9fs_stat_free(&vs->v9stat);
2902 complete_pdu(s, vs->pdu, err);
2903 qemu_free(vs);
2904 }
2905
2906 static void v9fs_wstat_post_chmod(V9fsState *s, V9fsWstatState *vs, int err)
2907 {
2908 if (err < 0) {
2909 goto out;
2910 }
2911
2912 if (vs->v9stat.mtime != -1 || vs->v9stat.atime != -1) {
2913 struct timespec times[2];
2914 if (vs->v9stat.atime != -1) {
2915 times[0].tv_sec = vs->v9stat.atime;
2916 times[0].tv_nsec = 0;
2917 } else {
2918 times[0].tv_nsec = UTIME_OMIT;
2919 }
2920 if (vs->v9stat.mtime != -1) {
2921 times[1].tv_sec = vs->v9stat.mtime;
2922 times[1].tv_nsec = 0;
2923 } else {
2924 times[1].tv_nsec = UTIME_OMIT;
2925 }
2926
2927 if (v9fs_do_utimensat(s, &vs->fidp->path, times)) {
2928 err = -errno;
2929 }
2930 }
2931
2932 v9fs_wstat_post_utime(s, vs, err);
2933 return;
2934
2935 out:
2936 v9fs_stat_free(&vs->v9stat);
2937 complete_pdu(s, vs->pdu, err);
2938 qemu_free(vs);
2939 }
2940
2941 static void v9fs_wstat_post_fsync(V9fsState *s, V9fsWstatState *vs, int err)
2942 {
2943 if (err == -1) {
2944 err = -errno;
2945 }
2946 v9fs_stat_free(&vs->v9stat);
2947 complete_pdu(s, vs->pdu, err);
2948 qemu_free(vs);
2949 }
2950
2951 static void v9fs_wstat_post_lstat(V9fsState *s, V9fsWstatState *vs, int err)
2952 {
2953 uint32_t v9_mode;
2954
2955 if (err == -1) {
2956 err = -errno;
2957 goto out;
2958 }
2959
2960 v9_mode = stat_to_v9mode(&vs->stbuf);
2961
2962 if ((vs->v9stat.mode & P9_STAT_MODE_TYPE_BITS) !=
2963 (v9_mode & P9_STAT_MODE_TYPE_BITS)) {
2964 /* Attempting to change the type */
2965 err = -EIO;
2966 goto out;
2967 }
2968
2969 if (v9fs_do_chmod(s, &vs->fidp->path, v9mode_to_mode(vs->v9stat.mode,
2970 &vs->v9stat.extension))) {
2971 err = -errno;
2972 }
2973 v9fs_wstat_post_chmod(s, vs, err);
2974 return;
2975
2976 out:
2977 v9fs_stat_free(&vs->v9stat);
2978 complete_pdu(s, vs->pdu, err);
2979 qemu_free(vs);
2980 }
2981
2982 static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu)
2983 {
2984 int32_t fid;
2985 V9fsWstatState *vs;
2986 int err = 0;
2987
2988 vs = qemu_malloc(sizeof(*vs));
2989 vs->pdu = pdu;
2990 vs->offset = 7;
2991
2992 pdu_unmarshal(pdu, vs->offset, "dwS", &fid, &vs->unused, &vs->v9stat);
2993
2994 vs->fidp = lookup_fid(s, fid);
2995 if (vs->fidp == NULL) {
2996 err = -EINVAL;
2997 goto out;
2998 }
2999
3000 /* do we need to sync the file? */
3001 if (donttouch_stat(&vs->v9stat)) {
3002 err = v9fs_do_fsync(s, vs->fidp->fs.fd, 0);
3003 v9fs_wstat_post_fsync(s, vs, err);
3004 return;
3005 }
3006
3007 if (vs->v9stat.mode != -1) {
3008 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
3009 v9fs_wstat_post_lstat(s, vs, err);
3010 return;
3011 }
3012
3013 v9fs_wstat_post_chmod(s, vs, err);
3014 return;
3015
3016 out:
3017 v9fs_stat_free(&vs->v9stat);
3018 complete_pdu(s, vs->pdu, err);
3019 qemu_free(vs);
3020 }
3021
3022 static void v9fs_statfs_post_statfs(V9fsState *s, V9fsStatfsState *vs, int err)
3023 {
3024 int32_t bsize_factor;
3025
3026 if (err) {
3027 err = -errno;
3028 goto out;
3029 }
3030
3031 /*
3032 * compute bsize factor based on host file system block size
3033 * and client msize
3034 */
3035 bsize_factor = (s->msize - P9_IOHDRSZ)/vs->stbuf.f_bsize;
3036 if (!bsize_factor) {
3037 bsize_factor = 1;
3038 }
3039 vs->v9statfs.f_type = vs->stbuf.f_type;
3040 vs->v9statfs.f_bsize = vs->stbuf.f_bsize;
3041 vs->v9statfs.f_bsize *= bsize_factor;
3042 /*
3043 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
3044 * adjust(divide) the number of blocks, free blocks and available
3045 * blocks by bsize factor
3046 */
3047 vs->v9statfs.f_blocks = vs->stbuf.f_blocks/bsize_factor;
3048 vs->v9statfs.f_bfree = vs->stbuf.f_bfree/bsize_factor;
3049 vs->v9statfs.f_bavail = vs->stbuf.f_bavail/bsize_factor;
3050 vs->v9statfs.f_files = vs->stbuf.f_files;
3051 vs->v9statfs.f_ffree = vs->stbuf.f_ffree;
3052 vs->v9statfs.fsid_val = (unsigned int) vs->stbuf.f_fsid.__val[0] |
3053 (unsigned long long)vs->stbuf.f_fsid.__val[1] << 32;
3054 vs->v9statfs.f_namelen = vs->stbuf.f_namelen;
3055
3056 vs->offset += pdu_marshal(vs->pdu, vs->offset, "ddqqqqqqd",
3057 vs->v9statfs.f_type, vs->v9statfs.f_bsize, vs->v9statfs.f_blocks,
3058 vs->v9statfs.f_bfree, vs->v9statfs.f_bavail, vs->v9statfs.f_files,
3059 vs->v9statfs.f_ffree, vs->v9statfs.fsid_val,
3060 vs->v9statfs.f_namelen);
3061
3062 out:
3063 complete_pdu(s, vs->pdu, vs->offset);
3064 qemu_free(vs);
3065 }
3066
3067 static void v9fs_statfs(V9fsState *s, V9fsPDU *pdu)
3068 {
3069 V9fsStatfsState *vs;
3070 ssize_t err = 0;
3071
3072 vs = qemu_malloc(sizeof(*vs));
3073 vs->pdu = pdu;
3074 vs->offset = 7;
3075
3076 memset(&vs->v9statfs, 0, sizeof(vs->v9statfs));
3077
3078 pdu_unmarshal(vs->pdu, vs->offset, "d", &vs->fid);
3079
3080 vs->fidp = lookup_fid(s, vs->fid);
3081 if (vs->fidp == NULL) {
3082 err = -ENOENT;
3083 goto out;
3084 }
3085
3086 err = v9fs_do_statfs(s, &vs->fidp->path, &vs->stbuf);
3087 v9fs_statfs_post_statfs(s, vs, err);
3088 return;
3089
3090 out:
3091 complete_pdu(s, vs->pdu, err);
3092 qemu_free(vs);
3093 }
3094
3095 static void v9fs_mknod_post_lstat(V9fsState *s, V9fsMkState *vs, int err)
3096 {
3097 if (err == -1) {
3098 err = -errno;
3099 goto out;
3100 }
3101
3102 stat_to_qid(&vs->stbuf, &vs->qid);
3103 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
3104 err = vs->offset;
3105 out:
3106 complete_pdu(s, vs->pdu, err);
3107 v9fs_string_free(&vs->fullname);
3108 v9fs_string_free(&vs->name);
3109 qemu_free(vs);
3110 }
3111
3112 static void v9fs_mknod_post_mknod(V9fsState *s, V9fsMkState *vs, int err)
3113 {
3114 if (err == -1) {
3115 err = -errno;
3116 goto out;
3117 }
3118
3119 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
3120 v9fs_mknod_post_lstat(s, vs, err);
3121 return;
3122 out:
3123 complete_pdu(s, vs->pdu, err);
3124 v9fs_string_free(&vs->fullname);
3125 v9fs_string_free(&vs->name);
3126 qemu_free(vs);
3127 }
3128
3129 static void v9fs_mknod(V9fsState *s, V9fsPDU *pdu)
3130 {
3131 int32_t fid;
3132 V9fsMkState *vs;
3133 int err = 0;
3134 V9fsFidState *fidp;
3135 gid_t gid;
3136 int mode;
3137 int major, minor;
3138
3139 vs = qemu_malloc(sizeof(*vs));
3140 vs->pdu = pdu;
3141 vs->offset = 7;
3142
3143 v9fs_string_init(&vs->fullname);
3144 pdu_unmarshal(vs->pdu, vs->offset, "dsdddd", &fid, &vs->name, &mode,
3145 &major, &minor, &gid);
3146
3147 fidp = lookup_fid(s, fid);
3148 if (fidp == NULL) {
3149 err = -ENOENT;
3150 goto out;
3151 }
3152
3153 v9fs_string_sprintf(&vs->fullname, "%s/%s", fidp->path.data, vs->name.data);
3154 err = v9fs_do_mknod(s, vs->fullname.data, mode, makedev(major, minor),
3155 fidp->uid, gid);
3156 v9fs_mknod_post_mknod(s, vs, err);
3157 return;
3158
3159 out:
3160 complete_pdu(s, vs->pdu, err);
3161 v9fs_string_free(&vs->fullname);
3162 v9fs_string_free(&vs->name);
3163 qemu_free(vs);
3164 }
3165
3166 /*
3167 * Implement posix byte range locking code
3168 * Server side handling of locking code is very simple, because 9p server in
3169 * QEMU can handle only one client. And most of the lock handling
3170 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
3171 * do any thing in * qemu 9p server side lock code path.
3172 * So when a TLOCK request comes, always return success
3173 */
3174
3175 static void v9fs_lock(V9fsState *s, V9fsPDU *pdu)
3176 {
3177 int32_t fid, err = 0;
3178 V9fsLockState *vs;
3179
3180 vs = qemu_mallocz(sizeof(*vs));
3181 vs->pdu = pdu;
3182 vs->offset = 7;
3183
3184 vs->flock = qemu_malloc(sizeof(*vs->flock));
3185 pdu_unmarshal(vs->pdu, vs->offset, "dbdqqds", &fid, &vs->flock->type,
3186 &vs->flock->flags, &vs->flock->start, &vs->flock->length,
3187 &vs->flock->proc_id, &vs->flock->client_id);
3188
3189 vs->status = P9_LOCK_ERROR;
3190
3191 /* We support only block flag now (that too ignored currently) */
3192 if (vs->flock->flags & ~P9_LOCK_FLAGS_BLOCK) {
3193 err = -EINVAL;
3194 goto out;
3195 }
3196 vs->fidp = lookup_fid(s, fid);
3197 if (vs->fidp == NULL) {
3198 err = -ENOENT;
3199 goto out;
3200 }
3201
3202 err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
3203 if (err < 0) {
3204 err = -errno;
3205 goto out;
3206 }
3207 vs->status = P9_LOCK_SUCCESS;
3208 out:
3209 vs->offset += pdu_marshal(vs->pdu, vs->offset, "b", vs->status);
3210 complete_pdu(s, vs->pdu, err);
3211 qemu_free(vs->flock);
3212 qemu_free(vs);
3213 }
3214
3215 /*
3216 * When a TGETLOCK request comes, always return success because all lock
3217 * handling is done by client's VFS layer.
3218 */
3219
3220 static void v9fs_getlock(V9fsState *s, V9fsPDU *pdu)
3221 {
3222 int32_t fid, err = 0;
3223 V9fsGetlockState *vs;
3224
3225 vs = qemu_mallocz(sizeof(*vs));
3226 vs->pdu = pdu;
3227 vs->offset = 7;
3228
3229 vs->glock = qemu_malloc(sizeof(*vs->glock));
3230 pdu_unmarshal(vs->pdu, vs->offset, "dbqqds", &fid, &vs->glock->type,
3231 &vs->glock->start, &vs->glock->length, &vs->glock->proc_id,
3232 &vs->glock->client_id);
3233
3234 vs->fidp = lookup_fid(s, fid);
3235 if (vs->fidp == NULL) {
3236 err = -ENOENT;
3237 goto out;
3238 }
3239
3240 err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
3241 if (err < 0) {
3242 err = -errno;
3243 goto out;
3244 }
3245 vs->glock->type = F_UNLCK;
3246 vs->offset += pdu_marshal(vs->pdu, vs->offset, "bqqds", vs->glock->type,
3247 vs->glock->start, vs->glock->length, vs->glock->proc_id,
3248 &vs->glock->client_id);
3249 out:
3250 complete_pdu(s, vs->pdu, err);
3251 qemu_free(vs->glock);
3252 qemu_free(vs);
3253 }
3254
3255 static void v9fs_mkdir_post_lstat(V9fsState *s, V9fsMkState *vs, int err)
3256 {
3257 if (err == -1) {
3258 err = -errno;
3259 goto out;
3260 }
3261
3262 stat_to_qid(&vs->stbuf, &vs->qid);
3263 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
3264 err = vs->offset;
3265 out:
3266 complete_pdu(s, vs->pdu, err);
3267 v9fs_string_free(&vs->fullname);
3268 v9fs_string_free(&vs->name);
3269 qemu_free(vs);
3270 }
3271
3272 static void v9fs_mkdir_post_mkdir(V9fsState *s, V9fsMkState *vs, int err)
3273 {
3274 if (err == -1) {
3275 err = -errno;
3276 goto out;
3277 }
3278
3279 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
3280 v9fs_mkdir_post_lstat(s, vs, err);
3281 return;
3282 out:
3283 complete_pdu(s, vs->pdu, err);
3284 v9fs_string_free(&vs->fullname);
3285 v9fs_string_free(&vs->name);
3286 qemu_free(vs);
3287 }
3288
3289 static void v9fs_mkdir(V9fsState *s, V9fsPDU *pdu)
3290 {
3291 int32_t fid;
3292 V9fsMkState *vs;
3293 int err = 0;
3294 V9fsFidState *fidp;
3295 gid_t gid;
3296 int mode;
3297
3298 vs = qemu_malloc(sizeof(*vs));
3299 vs->pdu = pdu;
3300 vs->offset = 7;
3301
3302 v9fs_string_init(&vs->fullname);
3303 pdu_unmarshal(vs->pdu, vs->offset, "dsdd", &fid, &vs->name, &mode,
3304 &gid);
3305
3306 fidp = lookup_fid(s, fid);
3307 if (fidp == NULL) {
3308 err = -ENOENT;
3309 goto out;
3310 }
3311
3312 v9fs_string_sprintf(&vs->fullname, "%s/%s", fidp->path.data, vs->name.data);
3313 err = v9fs_do_mkdir(s, vs->fullname.data, mode, fidp->uid, gid);
3314 v9fs_mkdir_post_mkdir(s, vs, err);
3315 return;
3316
3317 out:
3318 complete_pdu(s, vs->pdu, err);
3319 v9fs_string_free(&vs->fullname);
3320 v9fs_string_free(&vs->name);
3321 qemu_free(vs);
3322 }
3323
3324 static void v9fs_post_xattr_getvalue(V9fsState *s, V9fsXattrState *vs, int err)
3325 {
3326
3327 if (err < 0) {
3328 err = -errno;
3329 free_fid(s, vs->xattr_fidp->fid);
3330 goto out;
3331 }
3332 vs->offset += pdu_marshal(vs->pdu, vs->offset, "q", vs->size);
3333 err = vs->offset;
3334 out:
3335 complete_pdu(s, vs->pdu, err);
3336 v9fs_string_free(&vs->name);
3337 qemu_free(vs);
3338 return;
3339 }
3340
3341 static void v9fs_post_xattr_check(V9fsState *s, V9fsXattrState *vs, ssize_t err)
3342 {
3343 if (err < 0) {
3344 err = -errno;
3345 free_fid(s, vs->xattr_fidp->fid);
3346 goto out;
3347 }
3348 /*
3349 * Read the xattr value
3350 */
3351 vs->xattr_fidp->fs.xattr.len = vs->size;
3352 vs->xattr_fidp->fid_type = P9_FID_XATTR;
3353 vs->xattr_fidp->fs.xattr.copied_len = -1;
3354 if (vs->size) {
3355 vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3356 err = v9fs_do_lgetxattr(s, &vs->xattr_fidp->path,
3357 &vs->name, vs->xattr_fidp->fs.xattr.value,
3358 vs->xattr_fidp->fs.xattr.len);
3359 }
3360 v9fs_post_xattr_getvalue(s, vs, err);
3361 return;
3362 out:
3363 complete_pdu(s, vs->pdu, err);
3364 v9fs_string_free(&vs->name);
3365 qemu_free(vs);
3366 }
3367
3368 static void v9fs_post_lxattr_getvalue(V9fsState *s,
3369 V9fsXattrState *vs, int err)
3370 {
3371 if (err < 0) {
3372 err = -errno;
3373 free_fid(s, vs->xattr_fidp->fid);
3374 goto out;
3375 }
3376 vs->offset += pdu_marshal(vs->pdu, vs->offset, "q", vs->size);
3377 err = vs->offset;
3378 out:
3379 complete_pdu(s, vs->pdu, err);
3380 v9fs_string_free(&vs->name);
3381 qemu_free(vs);
3382 return;
3383 }
3384
3385 static void v9fs_post_lxattr_check(V9fsState *s,
3386 V9fsXattrState *vs, ssize_t err)
3387 {
3388 if (err < 0) {
3389 err = -errno;
3390 free_fid(s, vs->xattr_fidp->fid);
3391 goto out;
3392 }
3393 /*
3394 * Read the xattr value
3395 */
3396 vs->xattr_fidp->fs.xattr.len = vs->size;
3397 vs->xattr_fidp->fid_type = P9_FID_XATTR;
3398 vs->xattr_fidp->fs.xattr.copied_len = -1;
3399 if (vs->size) {
3400 vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3401 err = v9fs_do_llistxattr(s, &vs->xattr_fidp->path,
3402 vs->xattr_fidp->fs.xattr.value,
3403 vs->xattr_fidp->fs.xattr.len);
3404 }
3405 v9fs_post_lxattr_getvalue(s, vs, err);
3406 return;
3407 out:
3408 complete_pdu(s, vs->pdu, err);
3409 v9fs_string_free(&vs->name);
3410 qemu_free(vs);
3411 }
3412
3413 static void v9fs_xattrwalk(V9fsState *s, V9fsPDU *pdu)
3414 {
3415 ssize_t err = 0;
3416 V9fsXattrState *vs;
3417 int32_t fid, newfid;
3418
3419 vs = qemu_malloc(sizeof(*vs));
3420 vs->pdu = pdu;
3421 vs->offset = 7;
3422
3423 pdu_unmarshal(vs->pdu, vs->offset, "dds", &fid, &newfid, &vs->name);
3424 vs->file_fidp = lookup_fid(s, fid);
3425 if (vs->file_fidp == NULL) {
3426 err = -ENOENT;
3427 goto out;
3428 }
3429
3430 vs->xattr_fidp = alloc_fid(s, newfid);
3431 if (vs->xattr_fidp == NULL) {
3432 err = -EINVAL;
3433 goto out;
3434 }
3435
3436 v9fs_string_copy(&vs->xattr_fidp->path, &vs->file_fidp->path);
3437 if (vs->name.data[0] == 0) {
3438 /*
3439 * listxattr request. Get the size first
3440 */
3441 vs->size = v9fs_do_llistxattr(s, &vs->xattr_fidp->path,
3442 NULL, 0);
3443 if (vs->size < 0) {
3444 err = vs->size;
3445 }
3446 v9fs_post_lxattr_check(s, vs, err);
3447 return;
3448 } else {
3449 /*
3450 * specific xattr fid. We check for xattr
3451 * presence also collect the xattr size
3452 */
3453 vs->size = v9fs_do_lgetxattr(s, &vs->xattr_fidp->path,
3454 &vs->name, NULL, 0);
3455 if (vs->size < 0) {
3456 err = vs->size;
3457 }
3458 v9fs_post_xattr_check(s, vs, err);
3459 return;
3460 }
3461 out:
3462 complete_pdu(s, vs->pdu, err);
3463 v9fs_string_free(&vs->name);
3464 qemu_free(vs);
3465 }
3466
3467 static void v9fs_xattrcreate(V9fsState *s, V9fsPDU *pdu)
3468 {
3469 int flags;
3470 int32_t fid;
3471 ssize_t err = 0;
3472 V9fsXattrState *vs;
3473
3474 vs = qemu_malloc(sizeof(*vs));
3475 vs->pdu = pdu;
3476 vs->offset = 7;
3477
3478 pdu_unmarshal(vs->pdu, vs->offset, "dsqd",
3479 &fid, &vs->name, &vs->size, &flags);
3480
3481 vs->file_fidp = lookup_fid(s, fid);
3482 if (vs->file_fidp == NULL) {
3483 err = -EINVAL;
3484 goto out;
3485 }
3486
3487 /* Make the file fid point to xattr */
3488 vs->xattr_fidp = vs->file_fidp;
3489 vs->xattr_fidp->fid_type = P9_FID_XATTR;
3490 vs->xattr_fidp->fs.xattr.copied_len = 0;
3491 vs->xattr_fidp->fs.xattr.len = vs->size;
3492 vs->xattr_fidp->fs.xattr.flags = flags;
3493 v9fs_string_init(&vs->xattr_fidp->fs.xattr.name);
3494 v9fs_string_copy(&vs->xattr_fidp->fs.xattr.name, &vs->name);
3495 if (vs->size)
3496 vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3497 else
3498 vs->xattr_fidp->fs.xattr.value = NULL;
3499
3500 out:
3501 complete_pdu(s, vs->pdu, err);
3502 v9fs_string_free(&vs->name);
3503 qemu_free(vs);
3504 }
3505
3506 static void v9fs_readlink_post_readlink(V9fsState *s, V9fsReadLinkState *vs,
3507 int err)
3508 {
3509 if (err < 0) {
3510 err = -errno;
3511 goto out;
3512 }
3513 vs->offset += pdu_marshal(vs->pdu, vs->offset, "s", &vs->target);
3514 err = vs->offset;
3515 out:
3516 complete_pdu(s, vs->pdu, err);
3517 v9fs_string_free(&vs->target);
3518 qemu_free(vs);
3519 }
3520
3521 static void v9fs_readlink(V9fsState *s, V9fsPDU *pdu)
3522 {
3523 int32_t fid;
3524 V9fsReadLinkState *vs;
3525 int err = 0;
3526 V9fsFidState *fidp;
3527
3528 vs = qemu_malloc(sizeof(*vs));
3529 vs->pdu = pdu;
3530 vs->offset = 7;
3531
3532 pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
3533
3534 fidp = lookup_fid(s, fid);
3535 if (fidp == NULL) {
3536 err = -ENOENT;
3537 goto out;
3538 }
3539
3540 v9fs_string_init(&vs->target);
3541 err = v9fs_do_readlink(s, &fidp->path, &vs->target);
3542 v9fs_readlink_post_readlink(s, vs, err);
3543 return;
3544 out:
3545 complete_pdu(s, vs->pdu, err);
3546 qemu_free(vs);
3547 }
3548
3549 typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu);
3550
3551 static pdu_handler_t *pdu_handlers[] = {
3552 [P9_TREADDIR] = v9fs_readdir,
3553 [P9_TSTATFS] = v9fs_statfs,
3554 [P9_TGETATTR] = v9fs_getattr,
3555 [P9_TSETATTR] = v9fs_setattr,
3556 [P9_TXATTRWALK] = v9fs_xattrwalk,
3557 [P9_TXATTRCREATE] = v9fs_xattrcreate,
3558 [P9_TMKNOD] = v9fs_mknod,
3559 [P9_TRENAME] = v9fs_rename,
3560 [P9_TLOCK] = v9fs_lock,
3561 [P9_TGETLOCK] = v9fs_getlock,
3562 [P9_TREADLINK] = v9fs_readlink,
3563 [P9_TMKDIR] = v9fs_mkdir,
3564 [P9_TVERSION] = v9fs_version,
3565 [P9_TLOPEN] = v9fs_open,
3566 [P9_TATTACH] = v9fs_attach,
3567 [P9_TSTAT] = v9fs_stat,
3568 [P9_TWALK] = v9fs_walk,
3569 [P9_TCLUNK] = v9fs_clunk,
3570 [P9_TFSYNC] = v9fs_fsync,
3571 [P9_TOPEN] = v9fs_open,
3572 [P9_TREAD] = v9fs_read,
3573 #if 0
3574 [P9_TAUTH] = v9fs_auth,
3575 #endif
3576 [P9_TFLUSH] = v9fs_flush,
3577 [P9_TLINK] = v9fs_link,
3578 [P9_TSYMLINK] = v9fs_symlink,
3579 [P9_TCREATE] = v9fs_create,
3580 [P9_TLCREATE] = v9fs_lcreate,
3581 [P9_TWRITE] = v9fs_write,
3582 [P9_TWSTAT] = v9fs_wstat,
3583 [P9_TREMOVE] = v9fs_remove,
3584 };
3585
3586 static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
3587 {
3588 pdu_handler_t *handler;
3589
3590 if (debug_9p_pdu) {
3591 pprint_pdu(pdu);
3592 }
3593
3594 BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers));
3595
3596 handler = pdu_handlers[pdu->id];
3597 BUG_ON(handler == NULL);
3598
3599 handler(s, pdu);
3600 }
3601
3602 static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
3603 {
3604 V9fsState *s = (V9fsState *)vdev;
3605 V9fsPDU *pdu;
3606 ssize_t len;
3607
3608 while ((pdu = alloc_pdu(s)) &&
3609 (len = virtqueue_pop(vq, &pdu->elem)) != 0) {
3610 uint8_t *ptr;
3611
3612 BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0);
3613 BUG_ON(pdu->elem.out_sg[0].iov_len < 7);
3614
3615 ptr = pdu->elem.out_sg[0].iov_base;
3616
3617 memcpy(&pdu->size, ptr, 4);
3618 pdu->id = ptr[4];
3619 memcpy(&pdu->tag, ptr + 5, 2);
3620
3621 submit_pdu(s, pdu);
3622 }
3623
3624 free_pdu(s, pdu);
3625 }
3626
3627 static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
3628 {
3629 features |= 1 << VIRTIO_9P_MOUNT_TAG;
3630 return features;
3631 }
3632
3633 static V9fsState *to_virtio_9p(VirtIODevice *vdev)
3634 {
3635 return (V9fsState *)vdev;
3636 }
3637
3638 static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
3639 {
3640 struct virtio_9p_config *cfg;
3641 V9fsState *s = to_virtio_9p(vdev);
3642
3643 cfg = qemu_mallocz(sizeof(struct virtio_9p_config) +
3644 s->tag_len);
3645 stw_raw(&cfg->tag_len, s->tag_len);
3646 memcpy(cfg->tag, s->tag, s->tag_len);
3647 memcpy(config, cfg, s->config_size);
3648 qemu_free(cfg);
3649 }
3650
3651 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
3652 {
3653 V9fsState *s;
3654 int i, len;
3655 struct stat stat;
3656 FsTypeEntry *fse;
3657
3658
3659 s = (V9fsState *)virtio_common_init("virtio-9p",
3660 VIRTIO_ID_9P,
3661 sizeof(struct virtio_9p_config)+
3662 MAX_TAG_LEN,
3663 sizeof(V9fsState));
3664
3665 /* initialize pdu allocator */
3666 QLIST_INIT(&s->free_list);
3667 for (i = 0; i < (MAX_REQ - 1); i++) {
3668 QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next);
3669 }
3670
3671 s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output);
3672
3673 fse = get_fsdev_fsentry(conf->fsdev_id);
3674
3675 if (!fse) {
3676 /* We don't have a fsdev identified by fsdev_id */
3677 fprintf(stderr, "Virtio-9p device couldn't find fsdev with the "
3678 "id = %s\n", conf->fsdev_id ? conf->fsdev_id : "NULL");
3679 exit(1);
3680 }
3681
3682 if (!fse->path || !conf->tag) {
3683 /* we haven't specified a mount_tag or the path */
3684 fprintf(stderr, "fsdev with id %s needs path "
3685 "and Virtio-9p device needs mount_tag arguments\n",
3686 conf->fsdev_id);
3687 exit(1);
3688 }
3689
3690 if (!strcmp(fse->security_model, "passthrough")) {
3691 /* Files on the Fileserver set to client user credentials */
3692 s->ctx.fs_sm = SM_PASSTHROUGH;
3693 s->ctx.xops = passthrough_xattr_ops;
3694 } else if (!strcmp(fse->security_model, "mapped")) {
3695 /* Files on the fileserver are set to QEMU credentials.
3696 * Client user credentials are saved in extended attributes.
3697 */
3698 s->ctx.fs_sm = SM_MAPPED;
3699 s->ctx.xops = mapped_xattr_ops;
3700 } else if (!strcmp(fse->security_model, "none")) {
3701 /*
3702 * Files on the fileserver are set to QEMU credentials.
3703 */
3704 s->ctx.fs_sm = SM_NONE;
3705 s->ctx.xops = none_xattr_ops;
3706 } else {
3707 fprintf(stderr, "Default to security_model=none. You may want"
3708 " enable advanced security model using "
3709 "security option:\n\t security_model=passthrough \n\t "
3710 "security_model=mapped\n");
3711 s->ctx.fs_sm = SM_NONE;
3712 s->ctx.xops = none_xattr_ops;
3713 }
3714
3715 if (lstat(fse->path, &stat)) {
3716 fprintf(stderr, "share path %s does not exist\n", fse->path);
3717 exit(1);
3718 } else if (!S_ISDIR(stat.st_mode)) {
3719 fprintf(stderr, "share path %s is not a directory \n", fse->path);
3720 exit(1);
3721 }
3722
3723 s->ctx.fs_root = qemu_strdup(fse->path);
3724 len = strlen(conf->tag);
3725 if (len > MAX_TAG_LEN) {
3726 len = MAX_TAG_LEN;
3727 }
3728 /* s->tag is non-NULL terminated string */
3729 s->tag = qemu_malloc(len);
3730 memcpy(s->tag, conf->tag, len);
3731 s->tag_len = len;
3732 s->ctx.uid = -1;
3733
3734 s->ops = fse->ops;
3735 s->vdev.get_features = virtio_9p_get_features;
3736 s->config_size = sizeof(struct virtio_9p_config) +
3737 s->tag_len;
3738 s->vdev.get_config = virtio_9p_get_config;
3739
3740 return &s->vdev;
3741 }
various patches