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os-posix: set groups properly for -runas
[qemu/v9fs2.git] / hw / 9pfs / virtio-9p.c
blob4890df6f757e05fdc1b11e3f5d64bff1dd8551a7
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 "hw/virtio.h"
15 #include "hw/pc.h"
16 #include "qemu_socket.h"
17 #include "hw/virtio-pci.h"
18 #include "virtio-9p.h"
19 #include "fsdev/qemu-fsdev.h"
20 #include "virtio-9p-debug.h"
21 #include "virtio-9p-xattr.h"
22
23 int debug_9p_pdu;
24
25 enum {
26 Oread = 0x00,
27 Owrite = 0x01,
28 Ordwr = 0x02,
29 Oexec = 0x03,
30 Oexcl = 0x04,
31 Otrunc = 0x10,
32 Orexec = 0x20,
33 Orclose = 0x40,
34 Oappend = 0x80,
35 };
36
37 static int omode_to_uflags(int8_t mode)
38 {
39 int ret = 0;
40
41 switch (mode & 3) {
42 case Oread:
43 ret = O_RDONLY;
44 break;
45 case Ordwr:
46 ret = O_RDWR;
47 break;
48 case Owrite:
49 ret = O_WRONLY;
50 break;
51 case Oexec:
52 ret = O_RDONLY;
53 break;
54 }
55
56 if (mode & Otrunc) {
57 ret |= O_TRUNC;
58 }
59
60 if (mode & Oappend) {
61 ret |= O_APPEND;
62 }
63
64 if (mode & Oexcl) {
65 ret |= O_EXCL;
66 }
67
68 return ret;
69 }
70
71 void cred_init(FsCred *credp)
72 {
73 credp->fc_uid = -1;
74 credp->fc_gid = -1;
75 credp->fc_mode = -1;
76 credp->fc_rdev = -1;
77 }
78
79 static int v9fs_do_lstat(V9fsState *s, V9fsString *path, struct stat *stbuf)
80 {
81 return s->ops->lstat(&s->ctx, path->data, stbuf);
82 }
83
84 static ssize_t v9fs_do_readlink(V9fsState *s, V9fsString *path, V9fsString *buf)
85 {
86 ssize_t len;
87
88 buf->data = qemu_malloc(1024);
89
90 len = s->ops->readlink(&s->ctx, path->data, buf->data, 1024 - 1);
91 if (len > -1) {
92 buf->size = len;
93 buf->data[len] = 0;
94 }
95
96 return len;
97 }
98
99 static int v9fs_do_close(V9fsState *s, int fd)
100 {
101 return s->ops->close(&s->ctx, fd);
102 }
103
104 static int v9fs_do_closedir(V9fsState *s, DIR *dir)
105 {
106 return s->ops->closedir(&s->ctx, dir);
107 }
108
109 static int v9fs_do_open(V9fsState *s, V9fsString *path, int flags)
110 {
111 return s->ops->open(&s->ctx, path->data, flags);
112 }
113
114 static DIR *v9fs_do_opendir(V9fsState *s, V9fsString *path)
115 {
116 return s->ops->opendir(&s->ctx, path->data);
117 }
118
119 static void v9fs_do_rewinddir(V9fsState *s, DIR *dir)
120 {
121 return s->ops->rewinddir(&s->ctx, dir);
122 }
123
124 static off_t v9fs_do_telldir(V9fsState *s, DIR *dir)
125 {
126 return s->ops->telldir(&s->ctx, dir);
127 }
128
129 static struct dirent *v9fs_do_readdir(V9fsState *s, DIR *dir)
130 {
131 return s->ops->readdir(&s->ctx, dir);
132 }
133
134 static void v9fs_do_seekdir(V9fsState *s, DIR *dir, off_t off)
135 {
136 return s->ops->seekdir(&s->ctx, dir, off);
137 }
138
139 static int v9fs_do_preadv(V9fsState *s, int fd, const struct iovec *iov,
140 int iovcnt, int64_t offset)
141 {
142 return s->ops->preadv(&s->ctx, fd, iov, iovcnt, offset);
143 }
144
145 static int v9fs_do_pwritev(V9fsState *s, int fd, const struct iovec *iov,
146 int iovcnt, int64_t offset)
147 {
148 return s->ops->pwritev(&s->ctx, fd, iov, iovcnt, offset);
149 }
150
151 static int v9fs_do_chmod(V9fsState *s, V9fsString *path, mode_t mode)
152 {
153 FsCred cred;
154 cred_init(&cred);
155 cred.fc_mode = mode;
156 return s->ops->chmod(&s->ctx, path->data, &cred);
157 }
158
159 static int v9fs_do_mknod(V9fsState *s, char *name,
160 mode_t mode, dev_t dev, uid_t uid, gid_t gid)
161 {
162 FsCred cred;
163 cred_init(&cred);
164 cred.fc_uid = uid;
165 cred.fc_gid = gid;
166 cred.fc_mode = mode;
167 cred.fc_rdev = dev;
168 return s->ops->mknod(&s->ctx, name, &cred);
169 }
170
171 static int v9fs_do_mkdir(V9fsState *s, char *name, mode_t mode,
172 uid_t uid, gid_t gid)
173 {
174 FsCred cred;
175
176 cred_init(&cred);
177 cred.fc_uid = uid;
178 cred.fc_gid = gid;
179 cred.fc_mode = mode;
180
181 return s->ops->mkdir(&s->ctx, name, &cred);
182 }
183
184 static int v9fs_do_fstat(V9fsState *s, int fd, struct stat *stbuf)
185 {
186 return s->ops->fstat(&s->ctx, fd, stbuf);
187 }
188
189 static int v9fs_do_open2(V9fsState *s, char *fullname, uid_t uid, gid_t gid,
190 int flags, int mode)
191 {
192 FsCred cred;
193
194 cred_init(&cred);
195 cred.fc_uid = uid;
196 cred.fc_gid = gid;
197 cred.fc_mode = mode & 07777;
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 /*
427 * Return TRUE if s1 is an ancestor of s2.
428 *
429 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
430 * As a special case, We treat s1 as ancestor of s2 if they are same!
431 */
432 static int v9fs_path_is_ancestor(V9fsString *s1, V9fsString *s2)
433 {
434 if (!strncmp(s1->data, s2->data, s1->size)) {
435 if (s2->data[s1->size] == '\0' || s2->data[s1->size] == '/') {
436 return 1;
437 }
438 }
439 return 0;
440 }
441
442 static size_t v9fs_string_size(V9fsString *str)
443 {
444 return str->size;
445 }
446
447 static V9fsFidState *lookup_fid(V9fsState *s, int32_t fid)
448 {
449 V9fsFidState *f;
450
451 for (f = s->fid_list; f; f = f->next) {
452 if (f->fid == fid) {
453 return f;
454 }
455 }
456
457 return NULL;
458 }
459
460 static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
461 {
462 V9fsFidState *f;
463
464 f = lookup_fid(s, fid);
465 if (f) {
466 return NULL;
467 }
468
469 f = qemu_mallocz(sizeof(V9fsFidState));
470
471 f->fid = fid;
472 f->fid_type = P9_FID_NONE;
473
474 f->next = s->fid_list;
475 s->fid_list = f;
476
477 return f;
478 }
479
480 static int v9fs_xattr_fid_clunk(V9fsState *s, V9fsFidState *fidp)
481 {
482 int retval = 0;
483
484 if (fidp->fs.xattr.copied_len == -1) {
485 /* getxattr/listxattr fid */
486 goto free_value;
487 }
488 /*
489 * if this is fid for setxattr. clunk should
490 * result in setxattr localcall
491 */
492 if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) {
493 /* clunk after partial write */
494 retval = -EINVAL;
495 goto free_out;
496 }
497 if (fidp->fs.xattr.len) {
498 retval = v9fs_do_lsetxattr(s, &fidp->path, &fidp->fs.xattr.name,
499 fidp->fs.xattr.value,
500 fidp->fs.xattr.len,
501 fidp->fs.xattr.flags);
502 } else {
503 retval = v9fs_do_lremovexattr(s, &fidp->path, &fidp->fs.xattr.name);
504 }
505 free_out:
506 v9fs_string_free(&fidp->fs.xattr.name);
507 free_value:
508 if (fidp->fs.xattr.value) {
509 qemu_free(fidp->fs.xattr.value);
510 }
511 return retval;
512 }
513
514 static int free_fid(V9fsState *s, int32_t fid)
515 {
516 int retval = 0;
517 V9fsFidState **fidpp, *fidp;
518
519 for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) {
520 if ((*fidpp)->fid == fid) {
521 break;
522 }
523 }
524
525 if (*fidpp == NULL) {
526 return -ENOENT;
527 }
528
529 fidp = *fidpp;
530 *fidpp = fidp->next;
531
532 if (fidp->fid_type == P9_FID_FILE) {
533 v9fs_do_close(s, fidp->fs.fd);
534 } else if (fidp->fid_type == P9_FID_DIR) {
535 v9fs_do_closedir(s, fidp->fs.dir);
536 } else if (fidp->fid_type == P9_FID_XATTR) {
537 retval = v9fs_xattr_fid_clunk(s, fidp);
538 }
539 v9fs_string_free(&fidp->path);
540 qemu_free(fidp);
541
542 return retval;
543 }
544
545 #define P9_QID_TYPE_DIR 0x80
546 #define P9_QID_TYPE_SYMLINK 0x02
547
548 #define P9_STAT_MODE_DIR 0x80000000
549 #define P9_STAT_MODE_APPEND 0x40000000
550 #define P9_STAT_MODE_EXCL 0x20000000
551 #define P9_STAT_MODE_MOUNT 0x10000000
552 #define P9_STAT_MODE_AUTH 0x08000000
553 #define P9_STAT_MODE_TMP 0x04000000
554 #define P9_STAT_MODE_SYMLINK 0x02000000
555 #define P9_STAT_MODE_LINK 0x01000000
556 #define P9_STAT_MODE_DEVICE 0x00800000
557 #define P9_STAT_MODE_NAMED_PIPE 0x00200000
558 #define P9_STAT_MODE_SOCKET 0x00100000
559 #define P9_STAT_MODE_SETUID 0x00080000
560 #define P9_STAT_MODE_SETGID 0x00040000
561 #define P9_STAT_MODE_SETVTX 0x00010000
562
563 #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
564 P9_STAT_MODE_SYMLINK | \
565 P9_STAT_MODE_LINK | \
566 P9_STAT_MODE_DEVICE | \
567 P9_STAT_MODE_NAMED_PIPE | \
568 P9_STAT_MODE_SOCKET)
569
570 /* This is the algorithm from ufs in spfs */
571 static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
572 {
573 size_t size;
574
575 size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path));
576 memcpy(&qidp->path, &stbuf->st_ino, size);
577 qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8);
578 qidp->type = 0;
579 if (S_ISDIR(stbuf->st_mode)) {
580 qidp->type |= P9_QID_TYPE_DIR;
581 }
582 if (S_ISLNK(stbuf->st_mode)) {
583 qidp->type |= P9_QID_TYPE_SYMLINK;
584 }
585 }
586
587 static int fid_to_qid(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp)
588 {
589 struct stat stbuf;
590 int err;
591
592 err = v9fs_do_lstat(s, &fidp->path, &stbuf);
593 if (err) {
594 return err;
595 }
596
597 stat_to_qid(&stbuf, qidp);
598 return 0;
599 }
600
601 static V9fsPDU *alloc_pdu(V9fsState *s)
602 {
603 V9fsPDU *pdu = NULL;
604
605 if (!QLIST_EMPTY(&s->free_list)) {
606 pdu = QLIST_FIRST(&s->free_list);
607 QLIST_REMOVE(pdu, next);
608 }
609 return pdu;
610 }
611
612 static void free_pdu(V9fsState *s, V9fsPDU *pdu)
613 {
614 if (pdu) {
615 if (debug_9p_pdu) {
616 pprint_pdu(pdu);
617 }
618 QLIST_INSERT_HEAD(&s->free_list, pdu, next);
619 }
620 }
621
622 size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
623 size_t offset, size_t size, int pack)
624 {
625 int i = 0;
626 size_t copied = 0;
627
628 for (i = 0; size && i < sg_count; i++) {
629 size_t len;
630 if (offset >= sg[i].iov_len) {
631 /* skip this sg */
632 offset -= sg[i].iov_len;
633 continue;
634 } else {
635 len = MIN(sg[i].iov_len - offset, size);
636 if (pack) {
637 memcpy(sg[i].iov_base + offset, addr, len);
638 } else {
639 memcpy(addr, sg[i].iov_base + offset, len);
640 }
641 size -= len;
642 copied += len;
643 addr += len;
644 if (size) {
645 offset = 0;
646 continue;
647 }
648 }
649 }
650
651 return copied;
652 }
653
654 static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size)
655 {
656 return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
657 offset, size, 0);
658 }
659
660 static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src,
661 size_t size)
662 {
663 return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num,
664 offset, size, 1);
665 }
666
667 static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg)
668 {
669 size_t pos = 0;
670 int i, j;
671 struct iovec *src_sg;
672 unsigned int num;
673
674 if (rx) {
675 src_sg = pdu->elem.in_sg;
676 num = pdu->elem.in_num;
677 } else {
678 src_sg = pdu->elem.out_sg;
679 num = pdu->elem.out_num;
680 }
681
682 j = 0;
683 for (i = 0; i < num; i++) {
684 if (offset <= pos) {
685 sg[j].iov_base = src_sg[i].iov_base;
686 sg[j].iov_len = src_sg[i].iov_len;
687 j++;
688 } else if (offset < (src_sg[i].iov_len + pos)) {
689 sg[j].iov_base = src_sg[i].iov_base;
690 sg[j].iov_len = src_sg[i].iov_len;
691 sg[j].iov_base += (offset - pos);
692 sg[j].iov_len -= (offset - pos);
693 j++;
694 }
695 pos += src_sg[i].iov_len;
696 }
697
698 return j;
699 }
700
701 static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
702 {
703 size_t old_offset = offset;
704 va_list ap;
705 int i;
706
707 va_start(ap, fmt);
708 for (i = 0; fmt[i]; i++) {
709 switch (fmt[i]) {
710 case 'b': {
711 uint8_t *valp = va_arg(ap, uint8_t *);
712 offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
713 break;
714 }
715 case 'w': {
716 uint16_t val, *valp;
717 valp = va_arg(ap, uint16_t *);
718 offset += pdu_unpack(&val, pdu, offset, sizeof(val));
719 *valp = le16_to_cpu(val);
720 break;
721 }
722 case 'd': {
723 uint32_t val, *valp;
724 valp = va_arg(ap, uint32_t *);
725 offset += pdu_unpack(&val, pdu, offset, sizeof(val));
726 *valp = le32_to_cpu(val);
727 break;
728 }
729 case 'q': {
730 uint64_t val, *valp;
731 valp = va_arg(ap, uint64_t *);
732 offset += pdu_unpack(&val, pdu, offset, sizeof(val));
733 *valp = le64_to_cpu(val);
734 break;
735 }
736 case 'v': {
737 struct iovec *iov = va_arg(ap, struct iovec *);
738 int *iovcnt = va_arg(ap, int *);
739 *iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
740 break;
741 }
742 case 's': {
743 V9fsString *str = va_arg(ap, V9fsString *);
744 offset += pdu_unmarshal(pdu, offset, "w", &str->size);
745 /* FIXME: sanity check str->size */
746 str->data = qemu_malloc(str->size + 1);
747 offset += pdu_unpack(str->data, pdu, offset, str->size);
748 str->data[str->size] = 0;
749 break;
750 }
751 case 'Q': {
752 V9fsQID *qidp = va_arg(ap, V9fsQID *);
753 offset += pdu_unmarshal(pdu, offset, "bdq",
754 &qidp->type, &qidp->version, &qidp->path);
755 break;
756 }
757 case 'S': {
758 V9fsStat *statp = va_arg(ap, V9fsStat *);
759 offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
760 &statp->size, &statp->type, &statp->dev,
761 &statp->qid, &statp->mode, &statp->atime,
762 &statp->mtime, &statp->length,
763 &statp->name, &statp->uid, &statp->gid,
764 &statp->muid, &statp->extension,
765 &statp->n_uid, &statp->n_gid,
766 &statp->n_muid);
767 break;
768 }
769 case 'I': {
770 V9fsIattr *iattr = va_arg(ap, V9fsIattr *);
771 offset += pdu_unmarshal(pdu, offset, "ddddqqqqq",
772 &iattr->valid, &iattr->mode,
773 &iattr->uid, &iattr->gid, &iattr->size,
774 &iattr->atime_sec, &iattr->atime_nsec,
775 &iattr->mtime_sec, &iattr->mtime_nsec);
776 break;
777 }
778 default:
779 break;
780 }
781 }
782
783 va_end(ap);
784
785 return offset - old_offset;
786 }
787
788 static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
789 {
790 size_t old_offset = offset;
791 va_list ap;
792 int i;
793
794 va_start(ap, fmt);
795 for (i = 0; fmt[i]; i++) {
796 switch (fmt[i]) {
797 case 'b': {
798 uint8_t val = va_arg(ap, int);
799 offset += pdu_pack(pdu, offset, &val, sizeof(val));
800 break;
801 }
802 case 'w': {
803 uint16_t val;
804 cpu_to_le16w(&val, va_arg(ap, int));
805 offset += pdu_pack(pdu, offset, &val, sizeof(val));
806 break;
807 }
808 case 'd': {
809 uint32_t val;
810 cpu_to_le32w(&val, va_arg(ap, uint32_t));
811 offset += pdu_pack(pdu, offset, &val, sizeof(val));
812 break;
813 }
814 case 'q': {
815 uint64_t val;
816 cpu_to_le64w(&val, va_arg(ap, uint64_t));
817 offset += pdu_pack(pdu, offset, &val, sizeof(val));
818 break;
819 }
820 case 'v': {
821 struct iovec *iov = va_arg(ap, struct iovec *);
822 int *iovcnt = va_arg(ap, int *);
823 *iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
824 break;
825 }
826 case 's': {
827 V9fsString *str = va_arg(ap, V9fsString *);
828 offset += pdu_marshal(pdu, offset, "w", str->size);
829 offset += pdu_pack(pdu, offset, str->data, str->size);
830 break;
831 }
832 case 'Q': {
833 V9fsQID *qidp = va_arg(ap, V9fsQID *);
834 offset += pdu_marshal(pdu, offset, "bdq",
835 qidp->type, qidp->version, qidp->path);
836 break;
837 }
838 case 'S': {
839 V9fsStat *statp = va_arg(ap, V9fsStat *);
840 offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
841 statp->size, statp->type, statp->dev,
842 &statp->qid, statp->mode, statp->atime,
843 statp->mtime, statp->length, &statp->name,
844 &statp->uid, &statp->gid, &statp->muid,
845 &statp->extension, statp->n_uid,
846 statp->n_gid, statp->n_muid);
847 break;
848 }
849 case 'A': {
850 V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *);
851 offset += pdu_marshal(pdu, offset, "qQdddqqqqqqqqqqqqqqq",
852 statp->st_result_mask,
853 &statp->qid, statp->st_mode,
854 statp->st_uid, statp->st_gid,
855 statp->st_nlink, statp->st_rdev,
856 statp->st_size, statp->st_blksize, statp->st_blocks,
857 statp->st_atime_sec, statp->st_atime_nsec,
858 statp->st_mtime_sec, statp->st_mtime_nsec,
859 statp->st_ctime_sec, statp->st_ctime_nsec,
860 statp->st_btime_sec, statp->st_btime_nsec,
861 statp->st_gen, statp->st_data_version);
862 break;
863 }
864 default:
865 break;
866 }
867 }
868 va_end(ap);
869
870 return offset - old_offset;
871 }
872
873 static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
874 {
875 int8_t id = pdu->id + 1; /* Response */
876
877 if (len < 0) {
878 int err = -len;
879 len = 7;
880
881 if (s->proto_version != V9FS_PROTO_2000L) {
882 V9fsString str;
883
884 str.data = strerror(err);
885 str.size = strlen(str.data);
886
887 len += pdu_marshal(pdu, len, "s", &str);
888 id = P9_RERROR;
889 }
890
891 len += pdu_marshal(pdu, len, "d", err);
892
893 if (s->proto_version == V9FS_PROTO_2000L) {
894 id = P9_RLERROR;
895 }
896 }
897
898 /* fill out the header */
899 pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);
900
901 /* keep these in sync */
902 pdu->size = len;
903 pdu->id = id;
904
905 /* push onto queue and notify */
906 virtqueue_push(s->vq, &pdu->elem, len);
907
908 /* FIXME: we should batch these completions */
909 virtio_notify(&s->vdev, s->vq);
910
911 free_pdu(s, pdu);
912 }
913
914 static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
915 {
916 mode_t ret;
917
918 ret = mode & 0777;
919 if (mode & P9_STAT_MODE_DIR) {
920 ret |= S_IFDIR;
921 }
922
923 if (mode & P9_STAT_MODE_SYMLINK) {
924 ret |= S_IFLNK;
925 }
926 if (mode & P9_STAT_MODE_SOCKET) {
927 ret |= S_IFSOCK;
928 }
929 if (mode & P9_STAT_MODE_NAMED_PIPE) {
930 ret |= S_IFIFO;
931 }
932 if (mode & P9_STAT_MODE_DEVICE) {
933 if (extension && extension->data[0] == 'c') {
934 ret |= S_IFCHR;
935 } else {
936 ret |= S_IFBLK;
937 }
938 }
939
940 if (!(ret&~0777)) {
941 ret |= S_IFREG;
942 }
943
944 if (mode & P9_STAT_MODE_SETUID) {
945 ret |= S_ISUID;
946 }
947 if (mode & P9_STAT_MODE_SETGID) {
948 ret |= S_ISGID;
949 }
950 if (mode & P9_STAT_MODE_SETVTX) {
951 ret |= S_ISVTX;
952 }
953
954 return ret;
955 }
956
957 static int donttouch_stat(V9fsStat *stat)
958 {
959 if (stat->type == -1 &&
960 stat->dev == -1 &&
961 stat->qid.type == -1 &&
962 stat->qid.version == -1 &&
963 stat->qid.path == -1 &&
964 stat->mode == -1 &&
965 stat->atime == -1 &&
966 stat->mtime == -1 &&
967 stat->length == -1 &&
968 !stat->name.size &&
969 !stat->uid.size &&
970 !stat->gid.size &&
971 !stat->muid.size &&
972 stat->n_uid == -1 &&
973 stat->n_gid == -1 &&
974 stat->n_muid == -1) {
975 return 1;
976 }
977
978 return 0;
979 }
980
981 static void v9fs_stat_free(V9fsStat *stat)
982 {
983 v9fs_string_free(&stat->name);
984 v9fs_string_free(&stat->uid);
985 v9fs_string_free(&stat->gid);
986 v9fs_string_free(&stat->muid);
987 v9fs_string_free(&stat->extension);
988 }
989
990 static uint32_t stat_to_v9mode(const struct stat *stbuf)
991 {
992 uint32_t mode;
993
994 mode = stbuf->st_mode & 0777;
995 if (S_ISDIR(stbuf->st_mode)) {
996 mode |= P9_STAT_MODE_DIR;
997 }
998
999 if (S_ISLNK(stbuf->st_mode)) {
1000 mode |= P9_STAT_MODE_SYMLINK;
1001 }
1002
1003 if (S_ISSOCK(stbuf->st_mode)) {
1004 mode |= P9_STAT_MODE_SOCKET;
1005 }
1006
1007 if (S_ISFIFO(stbuf->st_mode)) {
1008 mode |= P9_STAT_MODE_NAMED_PIPE;
1009 }
1010
1011 if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
1012 mode |= P9_STAT_MODE_DEVICE;
1013 }
1014
1015 if (stbuf->st_mode & S_ISUID) {
1016 mode |= P9_STAT_MODE_SETUID;
1017 }
1018
1019 if (stbuf->st_mode & S_ISGID) {
1020 mode |= P9_STAT_MODE_SETGID;
1021 }
1022
1023 if (stbuf->st_mode & S_ISVTX) {
1024 mode |= P9_STAT_MODE_SETVTX;
1025 }
1026
1027 return mode;
1028 }
1029
1030 static int stat_to_v9stat(V9fsState *s, V9fsString *name,
1031 const struct stat *stbuf,
1032 V9fsStat *v9stat)
1033 {
1034 int err;
1035 const char *str;
1036
1037 memset(v9stat, 0, sizeof(*v9stat));
1038
1039 stat_to_qid(stbuf, &v9stat->qid);
1040 v9stat->mode = stat_to_v9mode(stbuf);
1041 v9stat->atime = stbuf->st_atime;
1042 v9stat->mtime = stbuf->st_mtime;
1043 v9stat->length = stbuf->st_size;
1044
1045 v9fs_string_null(&v9stat->uid);
1046 v9fs_string_null(&v9stat->gid);
1047 v9fs_string_null(&v9stat->muid);
1048
1049 v9stat->n_uid = stbuf->st_uid;
1050 v9stat->n_gid = stbuf->st_gid;
1051 v9stat->n_muid = 0;
1052
1053 v9fs_string_null(&v9stat->extension);
1054
1055 if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
1056 err = v9fs_do_readlink(s, name, &v9stat->extension);
1057 if (err == -1) {
1058 err = -errno;
1059 return err;
1060 }
1061 v9stat->extension.data[err] = 0;
1062 v9stat->extension.size = err;
1063 } else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
1064 v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
1065 S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
1066 major(stbuf->st_rdev), minor(stbuf->st_rdev));
1067 } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
1068 v9fs_string_sprintf(&v9stat->extension, "%s %lu",
1069 "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
1070 }
1071
1072 str = strrchr(name->data, '/');
1073 if (str) {
1074 str += 1;
1075 } else {
1076 str = name->data;
1077 }
1078
1079 v9fs_string_sprintf(&v9stat->name, "%s", str);
1080
1081 v9stat->size = 61 +
1082 v9fs_string_size(&v9stat->name) +
1083 v9fs_string_size(&v9stat->uid) +
1084 v9fs_string_size(&v9stat->gid) +
1085 v9fs_string_size(&v9stat->muid) +
1086 v9fs_string_size(&v9stat->extension);
1087 return 0;
1088 }
1089
1090 #define P9_STATS_MODE 0x00000001ULL
1091 #define P9_STATS_NLINK 0x00000002ULL
1092 #define P9_STATS_UID 0x00000004ULL
1093 #define P9_STATS_GID 0x00000008ULL
1094 #define P9_STATS_RDEV 0x00000010ULL
1095 #define P9_STATS_ATIME 0x00000020ULL
1096 #define P9_STATS_MTIME 0x00000040ULL
1097 #define P9_STATS_CTIME 0x00000080ULL
1098 #define P9_STATS_INO 0x00000100ULL
1099 #define P9_STATS_SIZE 0x00000200ULL
1100 #define P9_STATS_BLOCKS 0x00000400ULL
1101
1102 #define P9_STATS_BTIME 0x00000800ULL
1103 #define P9_STATS_GEN 0x00001000ULL
1104 #define P9_STATS_DATA_VERSION 0x00002000ULL
1105
1106 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
1107 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
1108
1109
1110 static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
1111 V9fsStatDotl *v9lstat)
1112 {
1113 memset(v9lstat, 0, sizeof(*v9lstat));
1114
1115 v9lstat->st_mode = stbuf->st_mode;
1116 v9lstat->st_nlink = stbuf->st_nlink;
1117 v9lstat->st_uid = stbuf->st_uid;
1118 v9lstat->st_gid = stbuf->st_gid;
1119 v9lstat->st_rdev = stbuf->st_rdev;
1120 v9lstat->st_size = stbuf->st_size;
1121 v9lstat->st_blksize = stbuf->st_blksize;
1122 v9lstat->st_blocks = stbuf->st_blocks;
1123 v9lstat->st_atime_sec = stbuf->st_atime;
1124 v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
1125 v9lstat->st_mtime_sec = stbuf->st_mtime;
1126 v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
1127 v9lstat->st_ctime_sec = stbuf->st_ctime;
1128 v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
1129 /* Currently we only support BASIC fields in stat */
1130 v9lstat->st_result_mask = P9_STATS_BASIC;
1131
1132 stat_to_qid(stbuf, &v9lstat->qid);
1133 }
1134
1135 static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt)
1136 {
1137 while (len && *iovcnt) {
1138 if (len < sg->iov_len) {
1139 sg->iov_len -= len;
1140 sg->iov_base += len;
1141 len = 0;
1142 } else {
1143 len -= sg->iov_len;
1144 sg++;
1145 *iovcnt -= 1;
1146 }
1147 }
1148
1149 return sg;
1150 }
1151
1152 static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt)
1153 {
1154 int i;
1155 int total = 0;
1156
1157 for (i = 0; i < *cnt; i++) {
1158 if ((total + sg[i].iov_len) > cap) {
1159 sg[i].iov_len -= ((total + sg[i].iov_len) - cap);
1160 i++;
1161 break;
1162 }
1163 total += sg[i].iov_len;
1164 }
1165
1166 *cnt = i;
1167
1168 return sg;
1169 }
1170
1171 static void print_sg(struct iovec *sg, int cnt)
1172 {
1173 int i;
1174
1175 printf("sg[%d]: {", cnt);
1176 for (i = 0; i < cnt; i++) {
1177 if (i) {
1178 printf(", ");
1179 }
1180 printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
1181 }
1182 printf("}\n");
1183 }
1184
1185 static void v9fs_fix_path(V9fsString *dst, V9fsString *src, int len)
1186 {
1187 V9fsString str;
1188 v9fs_string_init(&str);
1189 v9fs_string_copy(&str, dst);
1190 v9fs_string_sprintf(dst, "%s%s", src->data, str.data+len);
1191 v9fs_string_free(&str);
1192 }
1193
1194 static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
1195 {
1196 V9fsString version;
1197 size_t offset = 7;
1198
1199 pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
1200
1201 if (!strcmp(version.data, "9P2000.u")) {
1202 s->proto_version = V9FS_PROTO_2000U;
1203 } else if (!strcmp(version.data, "9P2000.L")) {
1204 s->proto_version = V9FS_PROTO_2000L;
1205 } else {
1206 v9fs_string_sprintf(&version, "unknown");
1207 }
1208
1209 offset += pdu_marshal(pdu, offset, "ds", s->msize, &version);
1210 complete_pdu(s, pdu, offset);
1211
1212 v9fs_string_free(&version);
1213 }
1214
1215 static void v9fs_attach(V9fsState *s, V9fsPDU *pdu)
1216 {
1217 int32_t fid, afid, n_uname;
1218 V9fsString uname, aname;
1219 V9fsFidState *fidp;
1220 V9fsQID qid;
1221 size_t offset = 7;
1222 ssize_t err;
1223
1224 pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname);
1225
1226 fidp = alloc_fid(s, fid);
1227 if (fidp == NULL) {
1228 err = -EINVAL;
1229 goto out;
1230 }
1231
1232 fidp->uid = n_uname;
1233
1234 v9fs_string_sprintf(&fidp->path, "%s", "/");
1235 err = fid_to_qid(s, fidp, &qid);
1236 if (err) {
1237 err = -EINVAL;
1238 free_fid(s, fid);
1239 goto out;
1240 }
1241
1242 offset += pdu_marshal(pdu, offset, "Q", &qid);
1243
1244 err = offset;
1245 out:
1246 complete_pdu(s, pdu, err);
1247 v9fs_string_free(&uname);
1248 v9fs_string_free(&aname);
1249 }
1250
1251 static void v9fs_stat_post_lstat(V9fsState *s, V9fsStatState *vs, int err)
1252 {
1253 if (err == -1) {
1254 err = -errno;
1255 goto out;
1256 }
1257
1258 err = stat_to_v9stat(s, &vs->fidp->path, &vs->stbuf, &vs->v9stat);
1259 if (err) {
1260 goto out;
1261 }
1262 vs->offset += pdu_marshal(vs->pdu, vs->offset, "wS", 0, &vs->v9stat);
1263 err = vs->offset;
1264
1265 out:
1266 complete_pdu(s, vs->pdu, err);
1267 v9fs_stat_free(&vs->v9stat);
1268 qemu_free(vs);
1269 }
1270
1271 static void v9fs_stat(V9fsState *s, V9fsPDU *pdu)
1272 {
1273 int32_t fid;
1274 V9fsStatState *vs;
1275 ssize_t err = 0;
1276
1277 vs = qemu_malloc(sizeof(*vs));
1278 vs->pdu = pdu;
1279 vs->offset = 7;
1280
1281 memset(&vs->v9stat, 0, sizeof(vs->v9stat));
1282
1283 pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
1284
1285 vs->fidp = lookup_fid(s, fid);
1286 if (vs->fidp == NULL) {
1287 err = -ENOENT;
1288 goto out;
1289 }
1290
1291 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1292 v9fs_stat_post_lstat(s, vs, err);
1293 return;
1294
1295 out:
1296 complete_pdu(s, vs->pdu, err);
1297 v9fs_stat_free(&vs->v9stat);
1298 qemu_free(vs);
1299 }
1300
1301 static void v9fs_getattr_post_lstat(V9fsState *s, V9fsStatStateDotl *vs,
1302 int err)
1303 {
1304 if (err == -1) {
1305 err = -errno;
1306 goto out;
1307 }
1308
1309 stat_to_v9stat_dotl(s, &vs->stbuf, &vs->v9stat_dotl);
1310 vs->offset += pdu_marshal(vs->pdu, vs->offset, "A", &vs->v9stat_dotl);
1311 err = vs->offset;
1312
1313 out:
1314 complete_pdu(s, vs->pdu, err);
1315 qemu_free(vs);
1316 }
1317
1318 static void v9fs_getattr(V9fsState *s, V9fsPDU *pdu)
1319 {
1320 int32_t fid;
1321 V9fsStatStateDotl *vs;
1322 ssize_t err = 0;
1323 V9fsFidState *fidp;
1324 uint64_t request_mask;
1325
1326 vs = qemu_malloc(sizeof(*vs));
1327 vs->pdu = pdu;
1328 vs->offset = 7;
1329
1330 memset(&vs->v9stat_dotl, 0, sizeof(vs->v9stat_dotl));
1331
1332 pdu_unmarshal(vs->pdu, vs->offset, "dq", &fid, &request_mask);
1333
1334 fidp = lookup_fid(s, fid);
1335 if (fidp == NULL) {
1336 err = -ENOENT;
1337 goto out;
1338 }
1339
1340 /* Currently we only support BASIC fields in stat, so there is no
1341 * need to look at request_mask.
1342 */
1343 err = v9fs_do_lstat(s, &fidp->path, &vs->stbuf);
1344 v9fs_getattr_post_lstat(s, vs, err);
1345 return;
1346
1347 out:
1348 complete_pdu(s, vs->pdu, err);
1349 qemu_free(vs);
1350 }
1351
1352 /* From Linux kernel code */
1353 #define ATTR_MODE (1 << 0)
1354 #define ATTR_UID (1 << 1)
1355 #define ATTR_GID (1 << 2)
1356 #define ATTR_SIZE (1 << 3)
1357 #define ATTR_ATIME (1 << 4)
1358 #define ATTR_MTIME (1 << 5)
1359 #define ATTR_CTIME (1 << 6)
1360 #define ATTR_MASK 127
1361 #define ATTR_ATIME_SET (1 << 7)
1362 #define ATTR_MTIME_SET (1 << 8)
1363
1364 static void v9fs_setattr_post_truncate(V9fsState *s, V9fsSetattrState *vs,
1365 int err)
1366 {
1367 if (err == -1) {
1368 err = -errno;
1369 goto out;
1370 }
1371 err = vs->offset;
1372
1373 out:
1374 complete_pdu(s, vs->pdu, err);
1375 qemu_free(vs);
1376 }
1377
1378 static void v9fs_setattr_post_chown(V9fsState *s, V9fsSetattrState *vs, int err)
1379 {
1380 if (err == -1) {
1381 err = -errno;
1382 goto out;
1383 }
1384
1385 if (vs->v9iattr.valid & (ATTR_SIZE)) {
1386 err = v9fs_do_truncate(s, &vs->fidp->path, vs->v9iattr.size);
1387 }
1388 v9fs_setattr_post_truncate(s, vs, err);
1389 return;
1390
1391 out:
1392 complete_pdu(s, vs->pdu, err);
1393 qemu_free(vs);
1394 }
1395
1396 static void v9fs_setattr_post_utimensat(V9fsState *s, V9fsSetattrState *vs,
1397 int err)
1398 {
1399 if (err == -1) {
1400 err = -errno;
1401 goto out;
1402 }
1403
1404 /* If the only valid entry in iattr is ctime we can call
1405 * chown(-1,-1) to update the ctime of the file
1406 */
1407 if ((vs->v9iattr.valid & (ATTR_UID | ATTR_GID)) ||
1408 ((vs->v9iattr.valid & ATTR_CTIME)
1409 && !((vs->v9iattr.valid & ATTR_MASK) & ~ATTR_CTIME))) {
1410 if (!(vs->v9iattr.valid & ATTR_UID)) {
1411 vs->v9iattr.uid = -1;
1412 }
1413 if (!(vs->v9iattr.valid & ATTR_GID)) {
1414 vs->v9iattr.gid = -1;
1415 }
1416 err = v9fs_do_chown(s, &vs->fidp->path, vs->v9iattr.uid,
1417 vs->v9iattr.gid);
1418 }
1419 v9fs_setattr_post_chown(s, vs, err);
1420 return;
1421
1422 out:
1423 complete_pdu(s, vs->pdu, err);
1424 qemu_free(vs);
1425 }
1426
1427 static void v9fs_setattr_post_chmod(V9fsState *s, V9fsSetattrState *vs, int err)
1428 {
1429 if (err == -1) {
1430 err = -errno;
1431 goto out;
1432 }
1433
1434 if (vs->v9iattr.valid & (ATTR_ATIME | ATTR_MTIME)) {
1435 struct timespec times[2];
1436 if (vs->v9iattr.valid & ATTR_ATIME) {
1437 if (vs->v9iattr.valid & ATTR_ATIME_SET) {
1438 times[0].tv_sec = vs->v9iattr.atime_sec;
1439 times[0].tv_nsec = vs->v9iattr.atime_nsec;
1440 } else {
1441 times[0].tv_nsec = UTIME_NOW;
1442 }
1443 } else {
1444 times[0].tv_nsec = UTIME_OMIT;
1445 }
1446
1447 if (vs->v9iattr.valid & ATTR_MTIME) {
1448 if (vs->v9iattr.valid & ATTR_MTIME_SET) {
1449 times[1].tv_sec = vs->v9iattr.mtime_sec;
1450 times[1].tv_nsec = vs->v9iattr.mtime_nsec;
1451 } else {
1452 times[1].tv_nsec = UTIME_NOW;
1453 }
1454 } else {
1455 times[1].tv_nsec = UTIME_OMIT;
1456 }
1457 err = v9fs_do_utimensat(s, &vs->fidp->path, times);
1458 }
1459 v9fs_setattr_post_utimensat(s, vs, err);
1460 return;
1461
1462 out:
1463 complete_pdu(s, vs->pdu, err);
1464 qemu_free(vs);
1465 }
1466
1467 static void v9fs_setattr(V9fsState *s, V9fsPDU *pdu)
1468 {
1469 int32_t fid;
1470 V9fsSetattrState *vs;
1471 int err = 0;
1472
1473 vs = qemu_malloc(sizeof(*vs));
1474 vs->pdu = pdu;
1475 vs->offset = 7;
1476
1477 pdu_unmarshal(pdu, vs->offset, "dI", &fid, &vs->v9iattr);
1478
1479 vs->fidp = lookup_fid(s, fid);
1480 if (vs->fidp == NULL) {
1481 err = -EINVAL;
1482 goto out;
1483 }
1484
1485 if (vs->v9iattr.valid & ATTR_MODE) {
1486 err = v9fs_do_chmod(s, &vs->fidp->path, vs->v9iattr.mode);
1487 }
1488
1489 v9fs_setattr_post_chmod(s, vs, err);
1490 return;
1491
1492 out:
1493 complete_pdu(s, vs->pdu, err);
1494 qemu_free(vs);
1495 }
1496
1497 static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err)
1498 {
1499 complete_pdu(s, vs->pdu, err);
1500
1501 if (vs->nwnames && vs->nwnames <= P9_MAXWELEM) {
1502 for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) {
1503 v9fs_string_free(&vs->wnames[vs->name_idx]);
1504 }
1505
1506 qemu_free(vs->wnames);
1507 qemu_free(vs->qids);
1508 }
1509 }
1510
1511 static void v9fs_walk_marshal(V9fsWalkState *vs)
1512 {
1513 int i;
1514 vs->offset = 7;
1515 vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames);
1516
1517 for (i = 0; i < vs->nwnames; i++) {
1518 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]);
1519 }
1520 }
1521
1522 static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs,
1523 int err)
1524 {
1525 if (err == -1) {
1526 free_fid(s, vs->newfidp->fid);
1527 v9fs_string_free(&vs->path);
1528 err = -ENOENT;
1529 goto out;
1530 }
1531
1532 stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
1533
1534 vs->name_idx++;
1535 if (vs->name_idx < vs->nwnames) {
1536 v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
1537 vs->wnames[vs->name_idx].data);
1538 v9fs_string_copy(&vs->newfidp->path, &vs->path);
1539
1540 err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
1541 v9fs_walk_post_newfid_lstat(s, vs, err);
1542 return;
1543 }
1544
1545 v9fs_string_free(&vs->path);
1546 v9fs_walk_marshal(vs);
1547 err = vs->offset;
1548 out:
1549 v9fs_walk_complete(s, vs, err);
1550 }
1551
1552 static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs,
1553 int err)
1554 {
1555 if (err == -1) {
1556 v9fs_string_free(&vs->path);
1557 err = -ENOENT;
1558 goto out;
1559 }
1560
1561 stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
1562 vs->name_idx++;
1563 if (vs->name_idx < vs->nwnames) {
1564
1565 v9fs_string_sprintf(&vs->path, "%s/%s",
1566 vs->fidp->path.data, vs->wnames[vs->name_idx].data);
1567 v9fs_string_copy(&vs->fidp->path, &vs->path);
1568
1569 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1570 v9fs_walk_post_oldfid_lstat(s, vs, err);
1571 return;
1572 }
1573
1574 v9fs_string_free(&vs->path);
1575 v9fs_walk_marshal(vs);
1576 err = vs->offset;
1577 out:
1578 v9fs_walk_complete(s, vs, err);
1579 }
1580
1581 static void v9fs_walk(V9fsState *s, V9fsPDU *pdu)
1582 {
1583 int32_t fid, newfid;
1584 V9fsWalkState *vs;
1585 int err = 0;
1586 int i;
1587
1588 vs = qemu_malloc(sizeof(*vs));
1589 vs->pdu = pdu;
1590 vs->wnames = NULL;
1591 vs->qids = NULL;
1592 vs->offset = 7;
1593
1594 vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &fid,
1595 &newfid, &vs->nwnames);
1596
1597 if (vs->nwnames && vs->nwnames <= P9_MAXWELEM) {
1598 vs->wnames = qemu_mallocz(sizeof(vs->wnames[0]) * vs->nwnames);
1599
1600 vs->qids = qemu_mallocz(sizeof(vs->qids[0]) * vs->nwnames);
1601
1602 for (i = 0; i < vs->nwnames; i++) {
1603 vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s",
1604 &vs->wnames[i]);
1605 }
1606 } else if (vs->nwnames > P9_MAXWELEM) {
1607 err = -EINVAL;
1608 goto out;
1609 }
1610
1611 vs->fidp = lookup_fid(s, fid);
1612 if (vs->fidp == NULL) {
1613 err = -ENOENT;
1614 goto out;
1615 }
1616
1617 /* FIXME: is this really valid? */
1618 if (fid == newfid) {
1619
1620 BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
1621 v9fs_string_init(&vs->path);
1622 vs->name_idx = 0;
1623
1624 if (vs->name_idx < vs->nwnames) {
1625 v9fs_string_sprintf(&vs->path, "%s/%s",
1626 vs->fidp->path.data, vs->wnames[vs->name_idx].data);
1627 v9fs_string_copy(&vs->fidp->path, &vs->path);
1628
1629 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1630 v9fs_walk_post_oldfid_lstat(s, vs, err);
1631 return;
1632 }
1633 } else {
1634 vs->newfidp = alloc_fid(s, newfid);
1635 if (vs->newfidp == NULL) {
1636 err = -EINVAL;
1637 goto out;
1638 }
1639
1640 vs->newfidp->uid = vs->fidp->uid;
1641 v9fs_string_init(&vs->path);
1642 vs->name_idx = 0;
1643 v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path);
1644
1645 if (vs->name_idx < vs->nwnames) {
1646 v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
1647 vs->wnames[vs->name_idx].data);
1648 v9fs_string_copy(&vs->newfidp->path, &vs->path);
1649
1650 err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
1651 v9fs_walk_post_newfid_lstat(s, vs, err);
1652 return;
1653 }
1654 }
1655
1656 v9fs_walk_marshal(vs);
1657 err = vs->offset;
1658 out:
1659 v9fs_walk_complete(s, vs, err);
1660 }
1661
1662 static int32_t get_iounit(V9fsState *s, V9fsString *name)
1663 {
1664 struct statfs stbuf;
1665 int32_t iounit = 0;
1666
1667 /*
1668 * iounit should be multiples of f_bsize (host filesystem block size
1669 * and as well as less than (client msize - P9_IOHDRSZ))
1670 */
1671 if (!v9fs_do_statfs(s, name, &stbuf)) {
1672 iounit = stbuf.f_bsize;
1673 iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
1674 }
1675
1676 if (!iounit) {
1677 iounit = s->msize - P9_IOHDRSZ;
1678 }
1679 return iounit;
1680 }
1681
1682 static void v9fs_open_post_opendir(V9fsState *s, V9fsOpenState *vs, int err)
1683 {
1684 if (vs->fidp->fs.dir == NULL) {
1685 err = -errno;
1686 goto out;
1687 }
1688 vs->fidp->fid_type = P9_FID_DIR;
1689 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0);
1690 err = vs->offset;
1691 out:
1692 complete_pdu(s, vs->pdu, err);
1693 qemu_free(vs);
1694
1695 }
1696
1697 static void v9fs_open_post_getiounit(V9fsState *s, V9fsOpenState *vs)
1698 {
1699 int err;
1700 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, vs->iounit);
1701 err = vs->offset;
1702 complete_pdu(s, vs->pdu, err);
1703 qemu_free(vs);
1704 }
1705
1706 static void v9fs_open_post_open(V9fsState *s, V9fsOpenState *vs, int err)
1707 {
1708 if (vs->fidp->fs.fd == -1) {
1709 err = -errno;
1710 goto out;
1711 }
1712 vs->fidp->fid_type = P9_FID_FILE;
1713 vs->iounit = get_iounit(s, &vs->fidp->path);
1714 v9fs_open_post_getiounit(s, vs);
1715 return;
1716 out:
1717 complete_pdu(s, vs->pdu, err);
1718 qemu_free(vs);
1719 }
1720
1721 static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err)
1722 {
1723 int flags;
1724
1725 if (err) {
1726 err = -errno;
1727 goto out;
1728 }
1729
1730 stat_to_qid(&vs->stbuf, &vs->qid);
1731
1732 if (S_ISDIR(vs->stbuf.st_mode)) {
1733 vs->fidp->fs.dir = v9fs_do_opendir(s, &vs->fidp->path);
1734 v9fs_open_post_opendir(s, vs, err);
1735 } else {
1736 if (s->proto_version == V9FS_PROTO_2000L) {
1737 flags = vs->mode;
1738 flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
1739 /* Ignore direct disk access hint until the server supports it. */
1740 flags &= ~O_DIRECT;
1741 } else {
1742 flags = omode_to_uflags(vs->mode);
1743 }
1744 vs->fidp->fs.fd = v9fs_do_open(s, &vs->fidp->path, flags);
1745 v9fs_open_post_open(s, vs, err);
1746 }
1747 return;
1748 out:
1749 complete_pdu(s, vs->pdu, err);
1750 qemu_free(vs);
1751 }
1752
1753 static void v9fs_open(V9fsState *s, V9fsPDU *pdu)
1754 {
1755 int32_t fid;
1756 V9fsOpenState *vs;
1757 ssize_t err = 0;
1758
1759 vs = qemu_malloc(sizeof(*vs));
1760 vs->pdu = pdu;
1761 vs->offset = 7;
1762 vs->mode = 0;
1763
1764 if (s->proto_version == V9FS_PROTO_2000L) {
1765 pdu_unmarshal(vs->pdu, vs->offset, "dd", &fid, &vs->mode);
1766 } else {
1767 pdu_unmarshal(vs->pdu, vs->offset, "db", &fid, &vs->mode);
1768 }
1769
1770 vs->fidp = lookup_fid(s, fid);
1771 if (vs->fidp == NULL) {
1772 err = -ENOENT;
1773 goto out;
1774 }
1775
1776 BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
1777
1778 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1779
1780 v9fs_open_post_lstat(s, vs, err);
1781 return;
1782 out:
1783 complete_pdu(s, pdu, err);
1784 qemu_free(vs);
1785 }
1786
1787 static void v9fs_post_lcreate(V9fsState *s, V9fsLcreateState *vs, int err)
1788 {
1789 if (err == 0) {
1790 v9fs_string_copy(&vs->fidp->path, &vs->fullname);
1791 stat_to_qid(&vs->stbuf, &vs->qid);
1792 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid,
1793 vs->iounit);
1794 err = vs->offset;
1795 } else {
1796 vs->fidp->fid_type = P9_FID_NONE;
1797 err = -errno;
1798 if (vs->fidp->fs.fd > 0) {
1799 close(vs->fidp->fs.fd);
1800 }
1801 }
1802
1803 complete_pdu(s, vs->pdu, err);
1804 v9fs_string_free(&vs->name);
1805 v9fs_string_free(&vs->fullname);
1806 qemu_free(vs);
1807 }
1808
1809 static void v9fs_lcreate_post_get_iounit(V9fsState *s, V9fsLcreateState *vs,
1810 int err)
1811 {
1812 if (err) {
1813 err = -errno;
1814 goto out;
1815 }
1816 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
1817
1818 out:
1819 v9fs_post_lcreate(s, vs, err);
1820 }
1821
1822 static void v9fs_lcreate_post_do_open2(V9fsState *s, V9fsLcreateState *vs,
1823 int err)
1824 {
1825 if (vs->fidp->fs.fd == -1) {
1826 err = -errno;
1827 goto out;
1828 }
1829 vs->fidp->fid_type = P9_FID_FILE;
1830 vs->iounit = get_iounit(s, &vs->fullname);
1831 v9fs_lcreate_post_get_iounit(s, vs, err);
1832 return;
1833
1834 out:
1835 v9fs_post_lcreate(s, vs, err);
1836 }
1837
1838 static void v9fs_lcreate(V9fsState *s, V9fsPDU *pdu)
1839 {
1840 int32_t dfid, flags, mode;
1841 gid_t gid;
1842 V9fsLcreateState *vs;
1843 ssize_t err = 0;
1844
1845 vs = qemu_malloc(sizeof(*vs));
1846 vs->pdu = pdu;
1847 vs->offset = 7;
1848
1849 v9fs_string_init(&vs->fullname);
1850
1851 pdu_unmarshal(vs->pdu, vs->offset, "dsddd", &dfid, &vs->name, &flags,
1852 &mode, &gid);
1853
1854 vs->fidp = lookup_fid(s, dfid);
1855 if (vs->fidp == NULL) {
1856 err = -ENOENT;
1857 goto out;
1858 }
1859
1860 v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
1861 vs->name.data);
1862
1863 /* Ignore direct disk access hint until the server supports it. */
1864 flags &= ~O_DIRECT;
1865
1866 vs->fidp->fs.fd = v9fs_do_open2(s, vs->fullname.data, vs->fidp->uid,
1867 gid, flags, mode);
1868 v9fs_lcreate_post_do_open2(s, vs, err);
1869 return;
1870
1871 out:
1872 complete_pdu(s, vs->pdu, err);
1873 v9fs_string_free(&vs->name);
1874 qemu_free(vs);
1875 }
1876
1877 static void v9fs_post_do_fsync(V9fsState *s, V9fsPDU *pdu, int err)
1878 {
1879 if (err == -1) {
1880 err = -errno;
1881 }
1882 complete_pdu(s, pdu, err);
1883 }
1884
1885 static void v9fs_fsync(V9fsState *s, V9fsPDU *pdu)
1886 {
1887 int32_t fid;
1888 size_t offset = 7;
1889 V9fsFidState *fidp;
1890 int datasync;
1891 int err;
1892
1893 pdu_unmarshal(pdu, offset, "dd", &fid, &datasync);
1894 fidp = lookup_fid(s, fid);
1895 if (fidp == NULL) {
1896 err = -ENOENT;
1897 v9fs_post_do_fsync(s, pdu, err);
1898 return;
1899 }
1900 err = v9fs_do_fsync(s, fidp->fs.fd, datasync);
1901 v9fs_post_do_fsync(s, pdu, err);
1902 }
1903
1904 static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu)
1905 {
1906 int32_t fid;
1907 size_t offset = 7;
1908 int err;
1909
1910 pdu_unmarshal(pdu, offset, "d", &fid);
1911
1912 err = free_fid(s, fid);
1913 if (err < 0) {
1914 goto out;
1915 }
1916
1917 offset = 7;
1918 err = offset;
1919 out:
1920 complete_pdu(s, pdu, err);
1921 }
1922
1923 static void v9fs_read_post_readdir(V9fsState *, V9fsReadState *, ssize_t);
1924
1925 static void v9fs_read_post_seekdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1926 {
1927 if (err) {
1928 goto out;
1929 }
1930 v9fs_stat_free(&vs->v9stat);
1931 v9fs_string_free(&vs->name);
1932 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
1933 vs->offset += vs->count;
1934 err = vs->offset;
1935 out:
1936 complete_pdu(s, vs->pdu, err);
1937 qemu_free(vs);
1938 return;
1939 }
1940
1941 static void v9fs_read_post_dir_lstat(V9fsState *s, V9fsReadState *vs,
1942 ssize_t err)
1943 {
1944 if (err) {
1945 err = -errno;
1946 goto out;
1947 }
1948 err = stat_to_v9stat(s, &vs->name, &vs->stbuf, &vs->v9stat);
1949 if (err) {
1950 goto out;
1951 }
1952
1953 vs->len = pdu_marshal(vs->pdu, vs->offset + 4 + vs->count, "S",
1954 &vs->v9stat);
1955 if ((vs->len != (vs->v9stat.size + 2)) ||
1956 ((vs->count + vs->len) > vs->max_count)) {
1957 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->dir_pos);
1958 v9fs_read_post_seekdir(s, vs, err);
1959 return;
1960 }
1961 vs->count += vs->len;
1962 v9fs_stat_free(&vs->v9stat);
1963 v9fs_string_free(&vs->name);
1964 vs->dir_pos = vs->dent->d_off;
1965 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
1966 v9fs_read_post_readdir(s, vs, err);
1967 return;
1968 out:
1969 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->dir_pos);
1970 v9fs_read_post_seekdir(s, vs, err);
1971 return;
1972
1973 }
1974
1975 static void v9fs_read_post_readdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1976 {
1977 if (vs->dent) {
1978 memset(&vs->v9stat, 0, sizeof(vs->v9stat));
1979 v9fs_string_init(&vs->name);
1980 v9fs_string_sprintf(&vs->name, "%s/%s", vs->fidp->path.data,
1981 vs->dent->d_name);
1982 err = v9fs_do_lstat(s, &vs->name, &vs->stbuf);
1983 v9fs_read_post_dir_lstat(s, vs, err);
1984 return;
1985 }
1986
1987 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
1988 vs->offset += vs->count;
1989 err = vs->offset;
1990 complete_pdu(s, vs->pdu, err);
1991 qemu_free(vs);
1992 return;
1993 }
1994
1995 static void v9fs_read_post_telldir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1996 {
1997 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
1998 v9fs_read_post_readdir(s, vs, err);
1999 return;
2000 }
2001
2002 static void v9fs_read_post_rewinddir(V9fsState *s, V9fsReadState *vs,
2003 ssize_t err)
2004 {
2005 vs->dir_pos = v9fs_do_telldir(s, vs->fidp->fs.dir);
2006 v9fs_read_post_telldir(s, vs, err);
2007 return;
2008 }
2009
2010 static void v9fs_read_post_preadv(V9fsState *s, V9fsReadState *vs, ssize_t err)
2011 {
2012 if (err < 0) {
2013 /* IO error return the error */
2014 err = -errno;
2015 goto out;
2016 }
2017 vs->total += vs->len;
2018 vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
2019 if (vs->total < vs->count && vs->len > 0) {
2020 do {
2021 if (0) {
2022 print_sg(vs->sg, vs->cnt);
2023 }
2024 vs->len = v9fs_do_preadv(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2025 vs->off);
2026 if (vs->len > 0) {
2027 vs->off += vs->len;
2028 }
2029 } while (vs->len == -1 && errno == EINTR);
2030 if (vs->len == -1) {
2031 err = -errno;
2032 }
2033 v9fs_read_post_preadv(s, vs, err);
2034 return;
2035 }
2036 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
2037 vs->offset += vs->count;
2038 err = vs->offset;
2039
2040 out:
2041 complete_pdu(s, vs->pdu, err);
2042 qemu_free(vs);
2043 }
2044
2045 static void v9fs_xattr_read(V9fsState *s, V9fsReadState *vs)
2046 {
2047 ssize_t err = 0;
2048 int read_count;
2049 int64_t xattr_len;
2050
2051 xattr_len = vs->fidp->fs.xattr.len;
2052 read_count = xattr_len - vs->off;
2053 if (read_count > vs->count) {
2054 read_count = vs->count;
2055 } else if (read_count < 0) {
2056 /*
2057 * read beyond XATTR value
2058 */
2059 read_count = 0;
2060 }
2061 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", read_count);
2062 vs->offset += pdu_pack(vs->pdu, vs->offset,
2063 ((char *)vs->fidp->fs.xattr.value) + vs->off,
2064 read_count);
2065 err = vs->offset;
2066 complete_pdu(s, vs->pdu, err);
2067 qemu_free(vs);
2068 }
2069
2070 static void v9fs_read(V9fsState *s, V9fsPDU *pdu)
2071 {
2072 int32_t fid;
2073 V9fsReadState *vs;
2074 ssize_t err = 0;
2075
2076 vs = qemu_malloc(sizeof(*vs));
2077 vs->pdu = pdu;
2078 vs->offset = 7;
2079 vs->total = 0;
2080 vs->len = 0;
2081 vs->count = 0;
2082
2083 pdu_unmarshal(vs->pdu, vs->offset, "dqd", &fid, &vs->off, &vs->count);
2084
2085 vs->fidp = lookup_fid(s, fid);
2086 if (vs->fidp == NULL) {
2087 err = -EINVAL;
2088 goto out;
2089 }
2090
2091 if (vs->fidp->fid_type == P9_FID_DIR) {
2092 vs->max_count = vs->count;
2093 vs->count = 0;
2094 if (vs->off == 0) {
2095 v9fs_do_rewinddir(s, vs->fidp->fs.dir);
2096 }
2097 v9fs_read_post_rewinddir(s, vs, err);
2098 return;
2099 } else if (vs->fidp->fid_type == P9_FID_FILE) {
2100 vs->sg = vs->iov;
2101 pdu_marshal(vs->pdu, vs->offset + 4, "v", vs->sg, &vs->cnt);
2102 vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
2103 if (vs->total <= vs->count) {
2104 vs->len = v9fs_do_preadv(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2105 vs->off);
2106 if (vs->len > 0) {
2107 vs->off += vs->len;
2108 }
2109 err = vs->len;
2110 v9fs_read_post_preadv(s, vs, err);
2111 }
2112 return;
2113 } else if (vs->fidp->fid_type == P9_FID_XATTR) {
2114 v9fs_xattr_read(s, vs);
2115 return;
2116 } else {
2117 err = -EINVAL;
2118 }
2119 out:
2120 complete_pdu(s, pdu, err);
2121 qemu_free(vs);
2122 }
2123
2124 typedef struct V9fsReadDirState {
2125 V9fsPDU *pdu;
2126 V9fsFidState *fidp;
2127 V9fsQID qid;
2128 off_t saved_dir_pos;
2129 struct dirent *dent;
2130 int32_t count;
2131 int32_t max_count;
2132 size_t offset;
2133 int64_t initial_offset;
2134 V9fsString name;
2135 } V9fsReadDirState;
2136
2137 static void v9fs_readdir_post_seekdir(V9fsState *s, V9fsReadDirState *vs)
2138 {
2139 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
2140 vs->offset += vs->count;
2141 complete_pdu(s, vs->pdu, vs->offset);
2142 qemu_free(vs);
2143 return;
2144 }
2145
2146 /* Size of each dirent on the wire: size of qid (13) + size of offset (8)
2147 * size of type (1) + size of name.size (2) + strlen(name.data)
2148 */
2149 #define V9_READDIR_DATA_SZ (24 + strlen(vs->name.data))
2150
2151 static void v9fs_readdir_post_readdir(V9fsState *s, V9fsReadDirState *vs)
2152 {
2153 int len;
2154 size_t size;
2155
2156 if (vs->dent) {
2157 v9fs_string_init(&vs->name);
2158 v9fs_string_sprintf(&vs->name, "%s", vs->dent->d_name);
2159
2160 if ((vs->count + V9_READDIR_DATA_SZ) > vs->max_count) {
2161 /* Ran out of buffer. Set dir back to old position and return */
2162 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->saved_dir_pos);
2163 v9fs_readdir_post_seekdir(s, vs);
2164 return;
2165 }
2166
2167 /* Fill up just the path field of qid because the client uses
2168 * only that. To fill the entire qid structure we will have
2169 * to stat each dirent found, which is expensive
2170 */
2171 size = MIN(sizeof(vs->dent->d_ino), sizeof(vs->qid.path));
2172 memcpy(&vs->qid.path, &vs->dent->d_ino, size);
2173 /* Fill the other fields with dummy values */
2174 vs->qid.type = 0;
2175 vs->qid.version = 0;
2176
2177 len = pdu_marshal(vs->pdu, vs->offset+4+vs->count, "Qqbs",
2178 &vs->qid, vs->dent->d_off,
2179 vs->dent->d_type, &vs->name);
2180 vs->count += len;
2181 v9fs_string_free(&vs->name);
2182 vs->saved_dir_pos = vs->dent->d_off;
2183 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
2184 v9fs_readdir_post_readdir(s, vs);
2185 return;
2186 }
2187
2188 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
2189 vs->offset += vs->count;
2190 complete_pdu(s, vs->pdu, vs->offset);
2191 qemu_free(vs);
2192 return;
2193 }
2194
2195 static void v9fs_readdir_post_telldir(V9fsState *s, V9fsReadDirState *vs)
2196 {
2197 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
2198 v9fs_readdir_post_readdir(s, vs);
2199 return;
2200 }
2201
2202 static void v9fs_readdir_post_setdir(V9fsState *s, V9fsReadDirState *vs)
2203 {
2204 vs->saved_dir_pos = v9fs_do_telldir(s, vs->fidp->fs.dir);
2205 v9fs_readdir_post_telldir(s, vs);
2206 return;
2207 }
2208
2209 static void v9fs_readdir(V9fsState *s, V9fsPDU *pdu)
2210 {
2211 int32_t fid;
2212 V9fsReadDirState *vs;
2213 ssize_t err = 0;
2214 size_t offset = 7;
2215
2216 vs = qemu_malloc(sizeof(*vs));
2217 vs->pdu = pdu;
2218 vs->offset = 7;
2219 vs->count = 0;
2220
2221 pdu_unmarshal(vs->pdu, offset, "dqd", &fid, &vs->initial_offset,
2222 &vs->max_count);
2223
2224 vs->fidp = lookup_fid(s, fid);
2225 if (vs->fidp == NULL || !(vs->fidp->fs.dir)) {
2226 err = -EINVAL;
2227 goto out;
2228 }
2229
2230 if (vs->initial_offset == 0) {
2231 v9fs_do_rewinddir(s, vs->fidp->fs.dir);
2232 } else {
2233 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->initial_offset);
2234 }
2235
2236 v9fs_readdir_post_setdir(s, vs);
2237 return;
2238
2239 out:
2240 complete_pdu(s, pdu, err);
2241 qemu_free(vs);
2242 return;
2243 }
2244
2245 static void v9fs_write_post_pwritev(V9fsState *s, V9fsWriteState *vs,
2246 ssize_t err)
2247 {
2248 if (err < 0) {
2249 /* IO error return the error */
2250 err = -errno;
2251 goto out;
2252 }
2253 vs->total += vs->len;
2254 vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
2255 if (vs->total < vs->count && vs->len > 0) {
2256 do {
2257 if (0) {
2258 print_sg(vs->sg, vs->cnt);
2259 }
2260 vs->len = v9fs_do_pwritev(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2261 vs->off);
2262 if (vs->len > 0) {
2263 vs->off += vs->len;
2264 }
2265 } while (vs->len == -1 && errno == EINTR);
2266 if (vs->len == -1) {
2267 err = -errno;
2268 }
2269 v9fs_write_post_pwritev(s, vs, err);
2270 return;
2271 }
2272 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
2273 err = vs->offset;
2274 out:
2275 complete_pdu(s, vs->pdu, err);
2276 qemu_free(vs);
2277 }
2278
2279 static void v9fs_xattr_write(V9fsState *s, V9fsWriteState *vs)
2280 {
2281 int i, to_copy;
2282 ssize_t err = 0;
2283 int write_count;
2284 int64_t xattr_len;
2285
2286 xattr_len = vs->fidp->fs.xattr.len;
2287 write_count = xattr_len - vs->off;
2288 if (write_count > vs->count) {
2289 write_count = vs->count;
2290 } else if (write_count < 0) {
2291 /*
2292 * write beyond XATTR value len specified in
2293 * xattrcreate
2294 */
2295 err = -ENOSPC;
2296 goto out;
2297 }
2298 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", write_count);
2299 err = vs->offset;
2300 vs->fidp->fs.xattr.copied_len += write_count;
2301 /*
2302 * Now copy the content from sg list
2303 */
2304 for (i = 0; i < vs->cnt; i++) {
2305 if (write_count > vs->sg[i].iov_len) {
2306 to_copy = vs->sg[i].iov_len;
2307 } else {
2308 to_copy = write_count;
2309 }
2310 memcpy((char *)vs->fidp->fs.xattr.value + vs->off,
2311 vs->sg[i].iov_base, to_copy);
2312 /* updating vs->off since we are not using below */
2313 vs->off += to_copy;
2314 write_count -= to_copy;
2315 }
2316 out:
2317 complete_pdu(s, vs->pdu, err);
2318 qemu_free(vs);
2319 }
2320
2321 static void v9fs_write(V9fsState *s, V9fsPDU *pdu)
2322 {
2323 int32_t fid;
2324 V9fsWriteState *vs;
2325 ssize_t err;
2326
2327 vs = qemu_malloc(sizeof(*vs));
2328
2329 vs->pdu = pdu;
2330 vs->offset = 7;
2331 vs->sg = vs->iov;
2332 vs->total = 0;
2333 vs->len = 0;
2334
2335 pdu_unmarshal(vs->pdu, vs->offset, "dqdv", &fid, &vs->off, &vs->count,
2336 vs->sg, &vs->cnt);
2337
2338 vs->fidp = lookup_fid(s, fid);
2339 if (vs->fidp == NULL) {
2340 err = -EINVAL;
2341 goto out;
2342 }
2343
2344 if (vs->fidp->fid_type == P9_FID_FILE) {
2345 if (vs->fidp->fs.fd == -1) {
2346 err = -EINVAL;
2347 goto out;
2348 }
2349 } else if (vs->fidp->fid_type == P9_FID_XATTR) {
2350 /*
2351 * setxattr operation
2352 */
2353 v9fs_xattr_write(s, vs);
2354 return;
2355 } else {
2356 err = -EINVAL;
2357 goto out;
2358 }
2359 vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
2360 if (vs->total <= vs->count) {
2361 vs->len = v9fs_do_pwritev(s, vs->fidp->fs.fd, vs->sg, vs->cnt, vs->off);
2362 if (vs->len > 0) {
2363 vs->off += vs->len;
2364 }
2365 err = vs->len;
2366 v9fs_write_post_pwritev(s, vs, err);
2367 }
2368 return;
2369 out:
2370 complete_pdu(s, vs->pdu, err);
2371 qemu_free(vs);
2372 }
2373
2374 static void v9fs_create_post_getiounit(V9fsState *s, V9fsCreateState *vs)
2375 {
2376 int err;
2377 v9fs_string_copy(&vs->fidp->path, &vs->fullname);
2378 stat_to_qid(&vs->stbuf, &vs->qid);
2379
2380 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, vs->iounit);
2381 err = vs->offset;
2382
2383 complete_pdu(s, vs->pdu, err);
2384 v9fs_string_free(&vs->name);
2385 v9fs_string_free(&vs->extension);
2386 v9fs_string_free(&vs->fullname);
2387 qemu_free(vs);
2388 }
2389
2390 static void v9fs_post_create(V9fsState *s, V9fsCreateState *vs, int err)
2391 {
2392 if (err == 0) {
2393 vs->iounit = get_iounit(s, &vs->fidp->path);
2394 v9fs_create_post_getiounit(s, vs);
2395 return;
2396 }
2397
2398 complete_pdu(s, vs->pdu, err);
2399 v9fs_string_free(&vs->name);
2400 v9fs_string_free(&vs->extension);
2401 v9fs_string_free(&vs->fullname);
2402 qemu_free(vs);
2403 }
2404
2405 static void v9fs_create_post_perms(V9fsState *s, V9fsCreateState *vs, int err)
2406 {
2407 if (err) {
2408 err = -errno;
2409 }
2410 v9fs_post_create(s, vs, err);
2411 }
2412
2413 static void v9fs_create_post_opendir(V9fsState *s, V9fsCreateState *vs,
2414 int err)
2415 {
2416 if (!vs->fidp->fs.dir) {
2417 err = -errno;
2418 }
2419 vs->fidp->fid_type = P9_FID_DIR;
2420 v9fs_post_create(s, vs, err);
2421 }
2422
2423 static void v9fs_create_post_dir_lstat(V9fsState *s, V9fsCreateState *vs,
2424 int err)
2425 {
2426 if (err) {
2427 err = -errno;
2428 goto out;
2429 }
2430
2431 vs->fidp->fs.dir = v9fs_do_opendir(s, &vs->fullname);
2432 v9fs_create_post_opendir(s, vs, err);
2433 return;
2434
2435 out:
2436 v9fs_post_create(s, vs, err);
2437 }
2438
2439 static void v9fs_create_post_mkdir(V9fsState *s, V9fsCreateState *vs, int err)
2440 {
2441 if (err) {
2442 err = -errno;
2443 goto out;
2444 }
2445
2446 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2447 v9fs_create_post_dir_lstat(s, vs, err);
2448 return;
2449
2450 out:
2451 v9fs_post_create(s, vs, err);
2452 }
2453
2454 static void v9fs_create_post_fstat(V9fsState *s, V9fsCreateState *vs, int err)
2455 {
2456 if (err) {
2457 vs->fidp->fid_type = P9_FID_NONE;
2458 close(vs->fidp->fs.fd);
2459 err = -errno;
2460 }
2461 v9fs_post_create(s, vs, err);
2462 return;
2463 }
2464
2465 static void v9fs_create_post_open2(V9fsState *s, V9fsCreateState *vs, int err)
2466 {
2467 if (vs->fidp->fs.fd == -1) {
2468 err = -errno;
2469 goto out;
2470 }
2471 vs->fidp->fid_type = P9_FID_FILE;
2472 err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
2473 v9fs_create_post_fstat(s, vs, err);
2474
2475 return;
2476
2477 out:
2478 v9fs_post_create(s, vs, err);
2479
2480 }
2481
2482 static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
2483 {
2484
2485 if (err == 0 || errno != ENOENT) {
2486 err = -errno;
2487 goto out;
2488 }
2489
2490 if (vs->perm & P9_STAT_MODE_DIR) {
2491 err = v9fs_do_mkdir(s, vs->fullname.data, vs->perm & 0777,
2492 vs->fidp->uid, -1);
2493 v9fs_create_post_mkdir(s, vs, err);
2494 } else if (vs->perm & P9_STAT_MODE_SYMLINK) {
2495 err = v9fs_do_symlink(s, vs->fidp, vs->extension.data,
2496 vs->fullname.data, -1);
2497 v9fs_create_post_perms(s, vs, err);
2498 } else if (vs->perm & P9_STAT_MODE_LINK) {
2499 int32_t nfid = atoi(vs->extension.data);
2500 V9fsFidState *nfidp = lookup_fid(s, nfid);
2501 if (nfidp == NULL) {
2502 err = -errno;
2503 v9fs_post_create(s, vs, err);
2504 }
2505 err = v9fs_do_link(s, &nfidp->path, &vs->fullname);
2506 v9fs_create_post_perms(s, vs, err);
2507 } else if (vs->perm & P9_STAT_MODE_DEVICE) {
2508 char ctype;
2509 uint32_t major, minor;
2510 mode_t nmode = 0;
2511
2512 if (sscanf(vs->extension.data, "%c %u %u", &ctype, &major,
2513 &minor) != 3) {
2514 err = -errno;
2515 v9fs_post_create(s, vs, err);
2516 }
2517
2518 switch (ctype) {
2519 case 'c':
2520 nmode = S_IFCHR;
2521 break;
2522 case 'b':
2523 nmode = S_IFBLK;
2524 break;
2525 default:
2526 err = -EIO;
2527 v9fs_post_create(s, vs, err);
2528 }
2529
2530 nmode |= vs->perm & 0777;
2531 err = v9fs_do_mknod(s, vs->fullname.data, nmode,
2532 makedev(major, minor), vs->fidp->uid, -1);
2533 v9fs_create_post_perms(s, vs, err);
2534 } else if (vs->perm & P9_STAT_MODE_NAMED_PIPE) {
2535 err = v9fs_do_mknod(s, vs->fullname.data, S_IFIFO | (vs->perm & 0777),
2536 0, vs->fidp->uid, -1);
2537 v9fs_post_create(s, vs, err);
2538 } else if (vs->perm & P9_STAT_MODE_SOCKET) {
2539 err = v9fs_do_mknod(s, vs->fullname.data, S_IFSOCK | (vs->perm & 0777),
2540 0, vs->fidp->uid, -1);
2541 v9fs_post_create(s, vs, err);
2542 } else {
2543 vs->fidp->fs.fd = v9fs_do_open2(s, vs->fullname.data, vs->fidp->uid,
2544 -1, omode_to_uflags(vs->mode)|O_CREAT, vs->perm);
2545
2546 v9fs_create_post_open2(s, vs, err);
2547 }
2548
2549 return;
2550
2551 out:
2552 v9fs_post_create(s, vs, err);
2553 }
2554
2555 static void v9fs_create(V9fsState *s, V9fsPDU *pdu)
2556 {
2557 int32_t fid;
2558 V9fsCreateState *vs;
2559 int err = 0;
2560
2561 vs = qemu_malloc(sizeof(*vs));
2562 vs->pdu = pdu;
2563 vs->offset = 7;
2564
2565 v9fs_string_init(&vs->fullname);
2566
2567 pdu_unmarshal(vs->pdu, vs->offset, "dsdbs", &fid, &vs->name,
2568 &vs->perm, &vs->mode, &vs->extension);
2569
2570 vs->fidp = lookup_fid(s, fid);
2571 if (vs->fidp == NULL) {
2572 err = -EINVAL;
2573 goto out;
2574 }
2575
2576 v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
2577 vs->name.data);
2578
2579 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2580 v9fs_create_post_lstat(s, vs, err);
2581 return;
2582
2583 out:
2584 complete_pdu(s, vs->pdu, err);
2585 v9fs_string_free(&vs->name);
2586 v9fs_string_free(&vs->extension);
2587 qemu_free(vs);
2588 }
2589
2590 static void v9fs_post_symlink(V9fsState *s, V9fsSymlinkState *vs, int err)
2591 {
2592 if (err == 0) {
2593 stat_to_qid(&vs->stbuf, &vs->qid);
2594 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
2595 err = vs->offset;
2596 } else {
2597 err = -errno;
2598 }
2599 complete_pdu(s, vs->pdu, err);
2600 v9fs_string_free(&vs->name);
2601 v9fs_string_free(&vs->symname);
2602 v9fs_string_free(&vs->fullname);
2603 qemu_free(vs);
2604 }
2605
2606 static void v9fs_symlink_post_do_symlink(V9fsState *s, V9fsSymlinkState *vs,
2607 int err)
2608 {
2609 if (err) {
2610 goto out;
2611 }
2612 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2613 out:
2614 v9fs_post_symlink(s, vs, err);
2615 }
2616
2617 static void v9fs_symlink(V9fsState *s, V9fsPDU *pdu)
2618 {
2619 int32_t dfid;
2620 V9fsSymlinkState *vs;
2621 int err = 0;
2622 gid_t gid;
2623
2624 vs = qemu_malloc(sizeof(*vs));
2625 vs->pdu = pdu;
2626 vs->offset = 7;
2627
2628 v9fs_string_init(&vs->fullname);
2629
2630 pdu_unmarshal(vs->pdu, vs->offset, "dssd", &dfid, &vs->name,
2631 &vs->symname, &gid);
2632
2633 vs->dfidp = lookup_fid(s, dfid);
2634 if (vs->dfidp == NULL) {
2635 err = -EINVAL;
2636 goto out;
2637 }
2638
2639 v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->dfidp->path.data,
2640 vs->name.data);
2641 err = v9fs_do_symlink(s, vs->dfidp, vs->symname.data,
2642 vs->fullname.data, gid);
2643 v9fs_symlink_post_do_symlink(s, vs, err);
2644 return;
2645
2646 out:
2647 complete_pdu(s, vs->pdu, err);
2648 v9fs_string_free(&vs->name);
2649 v9fs_string_free(&vs->symname);
2650 qemu_free(vs);
2651 }
2652
2653 static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)
2654 {
2655 /* A nop call with no return */
2656 complete_pdu(s, pdu, 7);
2657 }
2658
2659 static void v9fs_link(V9fsState *s, V9fsPDU *pdu)
2660 {
2661 int32_t dfid, oldfid;
2662 V9fsFidState *dfidp, *oldfidp;
2663 V9fsString name, fullname;
2664 size_t offset = 7;
2665 int err = 0;
2666
2667 v9fs_string_init(&fullname);
2668
2669 pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name);
2670
2671 dfidp = lookup_fid(s, dfid);
2672 if (dfidp == NULL) {
2673 err = -errno;
2674 goto out;
2675 }
2676
2677 oldfidp = lookup_fid(s, oldfid);
2678 if (oldfidp == NULL) {
2679 err = -errno;
2680 goto out;
2681 }
2682
2683 v9fs_string_sprintf(&fullname, "%s/%s", dfidp->path.data, name.data);
2684 err = offset;
2685 err = v9fs_do_link(s, &oldfidp->path, &fullname);
2686 if (err) {
2687 err = -errno;
2688 }
2689 v9fs_string_free(&fullname);
2690
2691 out:
2692 v9fs_string_free(&name);
2693 complete_pdu(s, pdu, err);
2694 }
2695
2696 static void v9fs_remove_post_remove(V9fsState *s, V9fsRemoveState *vs,
2697 int err)
2698 {
2699 if (err < 0) {
2700 err = -errno;
2701 } else {
2702 err = vs->offset;
2703 }
2704
2705 /* For TREMOVE we need to clunk the fid even on failed remove */
2706 free_fid(s, vs->fidp->fid);
2707
2708 complete_pdu(s, vs->pdu, err);
2709 qemu_free(vs);
2710 }
2711
2712 static void v9fs_remove(V9fsState *s, V9fsPDU *pdu)
2713 {
2714 int32_t fid;
2715 V9fsRemoveState *vs;
2716 int err = 0;
2717
2718 vs = qemu_malloc(sizeof(*vs));
2719 vs->pdu = pdu;
2720 vs->offset = 7;
2721
2722 pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
2723
2724 vs->fidp = lookup_fid(s, fid);
2725 if (vs->fidp == NULL) {
2726 err = -EINVAL;
2727 goto out;
2728 }
2729
2730 err = v9fs_do_remove(s, &vs->fidp->path);
2731 v9fs_remove_post_remove(s, vs, err);
2732 return;
2733
2734 out:
2735 complete_pdu(s, pdu, err);
2736 qemu_free(vs);
2737 }
2738
2739 static void v9fs_wstat_post_truncate(V9fsState *s, V9fsWstatState *vs, int err)
2740 {
2741 if (err < 0) {
2742 goto out;
2743 }
2744
2745 err = vs->offset;
2746
2747 out:
2748 v9fs_stat_free(&vs->v9stat);
2749 complete_pdu(s, vs->pdu, err);
2750 qemu_free(vs);
2751 }
2752
2753 static void v9fs_wstat_post_rename(V9fsState *s, V9fsWstatState *vs, int err)
2754 {
2755 if (err < 0) {
2756 goto out;
2757 }
2758 if (vs->v9stat.length != -1) {
2759 if (v9fs_do_truncate(s, &vs->fidp->path, vs->v9stat.length) < 0) {
2760 err = -errno;
2761 }
2762 }
2763 v9fs_wstat_post_truncate(s, vs, err);
2764 return;
2765
2766 out:
2767 v9fs_stat_free(&vs->v9stat);
2768 complete_pdu(s, vs->pdu, err);
2769 qemu_free(vs);
2770 }
2771
2772 static int v9fs_complete_rename(V9fsState *s, V9fsRenameState *vs)
2773 {
2774 int err = 0;
2775 char *old_name, *new_name;
2776 char *end;
2777
2778 if (vs->newdirfid != -1) {
2779 V9fsFidState *dirfidp;
2780 dirfidp = lookup_fid(s, vs->newdirfid);
2781
2782 if (dirfidp == NULL) {
2783 err = -ENOENT;
2784 goto out;
2785 }
2786
2787 BUG_ON(dirfidp->fid_type != P9_FID_NONE);
2788
2789 new_name = qemu_mallocz(dirfidp->path.size + vs->name.size + 2);
2790
2791 strcpy(new_name, dirfidp->path.data);
2792 strcat(new_name, "/");
2793 strcat(new_name + dirfidp->path.size, vs->name.data);
2794 } else {
2795 old_name = vs->fidp->path.data;
2796 end = strrchr(old_name, '/');
2797 if (end) {
2798 end++;
2799 } else {
2800 end = old_name;
2801 }
2802 new_name = qemu_mallocz(end - old_name + vs->name.size + 1);
2803
2804 strncat(new_name, old_name, end - old_name);
2805 strncat(new_name + (end - old_name), vs->name.data, vs->name.size);
2806 }
2807
2808 v9fs_string_free(&vs->name);
2809 vs->name.data = qemu_strdup(new_name);
2810 vs->name.size = strlen(new_name);
2811
2812 if (strcmp(new_name, vs->fidp->path.data) != 0) {
2813 if (v9fs_do_rename(s, &vs->fidp->path, &vs->name)) {
2814 err = -errno;
2815 } else {
2816 V9fsFidState *fidp;
2817 /*
2818 * Fixup fid's pointing to the old name to
2819 * start pointing to the new name
2820 */
2821 for (fidp = s->fid_list; fidp; fidp = fidp->next) {
2822 if (vs->fidp == fidp) {
2823 /*
2824 * we replace name of this fid towards the end so
2825 * that our below v9fs_path_is_ancestor check will
2826 * work
2827 */
2828 continue;
2829 }
2830 if (v9fs_path_is_ancestor(&vs->fidp->path, &fidp->path)) {
2831 /* replace the name */
2832 v9fs_fix_path(&fidp->path, &vs->name,
2833 strlen(vs->fidp->path.data));
2834 }
2835 }
2836 v9fs_string_copy(&vs->fidp->path, &vs->name);
2837 }
2838 }
2839 out:
2840 v9fs_string_free(&vs->name);
2841 return err;
2842 }
2843
2844 static void v9fs_rename_post_rename(V9fsState *s, V9fsRenameState *vs, int err)
2845 {
2846 complete_pdu(s, vs->pdu, err);
2847 qemu_free(vs);
2848 }
2849
2850 static void v9fs_wstat_post_chown(V9fsState *s, V9fsWstatState *vs, int err)
2851 {
2852 if (err < 0) {
2853 goto out;
2854 }
2855
2856 if (vs->v9stat.name.size != 0) {
2857 V9fsRenameState *vr;
2858
2859 vr = qemu_mallocz(sizeof(V9fsRenameState));
2860 vr->newdirfid = -1;
2861 vr->pdu = vs->pdu;
2862 vr->fidp = vs->fidp;
2863 vr->offset = vs->offset;
2864 vr->name.size = vs->v9stat.name.size;
2865 vr->name.data = qemu_strdup(vs->v9stat.name.data);
2866
2867 err = v9fs_complete_rename(s, vr);
2868 qemu_free(vr);
2869 }
2870 v9fs_wstat_post_rename(s, vs, err);
2871 return;
2872
2873 out:
2874 v9fs_stat_free(&vs->v9stat);
2875 complete_pdu(s, vs->pdu, err);
2876 qemu_free(vs);
2877 }
2878
2879 static void v9fs_rename(V9fsState *s, V9fsPDU *pdu)
2880 {
2881 int32_t fid;
2882 V9fsRenameState *vs;
2883 ssize_t err = 0;
2884
2885 vs = qemu_malloc(sizeof(*vs));
2886 vs->pdu = pdu;
2887 vs->offset = 7;
2888
2889 pdu_unmarshal(vs->pdu, vs->offset, "dds", &fid, &vs->newdirfid, &vs->name);
2890
2891 vs->fidp = lookup_fid(s, fid);
2892 if (vs->fidp == NULL) {
2893 err = -ENOENT;
2894 goto out;
2895 }
2896
2897 BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
2898
2899 err = v9fs_complete_rename(s, vs);
2900 v9fs_rename_post_rename(s, vs, err);
2901 return;
2902 out:
2903 complete_pdu(s, vs->pdu, err);
2904 qemu_free(vs);
2905 }
2906
2907 static void v9fs_wstat_post_utime(V9fsState *s, V9fsWstatState *vs, int err)
2908 {
2909 if (err < 0) {
2910 goto out;
2911 }
2912
2913 if (vs->v9stat.n_gid != -1 || vs->v9stat.n_uid != -1) {
2914 if (v9fs_do_chown(s, &vs->fidp->path, vs->v9stat.n_uid,
2915 vs->v9stat.n_gid)) {
2916 err = -errno;
2917 }
2918 }
2919 v9fs_wstat_post_chown(s, vs, err);
2920 return;
2921
2922 out:
2923 v9fs_stat_free(&vs->v9stat);
2924 complete_pdu(s, vs->pdu, err);
2925 qemu_free(vs);
2926 }
2927
2928 static void v9fs_wstat_post_chmod(V9fsState *s, V9fsWstatState *vs, int err)
2929 {
2930 if (err < 0) {
2931 goto out;
2932 }
2933
2934 if (vs->v9stat.mtime != -1 || vs->v9stat.atime != -1) {
2935 struct timespec times[2];
2936 if (vs->v9stat.atime != -1) {
2937 times[0].tv_sec = vs->v9stat.atime;
2938 times[0].tv_nsec = 0;
2939 } else {
2940 times[0].tv_nsec = UTIME_OMIT;
2941 }
2942 if (vs->v9stat.mtime != -1) {
2943 times[1].tv_sec = vs->v9stat.mtime;
2944 times[1].tv_nsec = 0;
2945 } else {
2946 times[1].tv_nsec = UTIME_OMIT;
2947 }
2948
2949 if (v9fs_do_utimensat(s, &vs->fidp->path, times)) {
2950 err = -errno;
2951 }
2952 }
2953
2954 v9fs_wstat_post_utime(s, vs, err);
2955 return;
2956
2957 out:
2958 v9fs_stat_free(&vs->v9stat);
2959 complete_pdu(s, vs->pdu, err);
2960 qemu_free(vs);
2961 }
2962
2963 static void v9fs_wstat_post_fsync(V9fsState *s, V9fsWstatState *vs, int err)
2964 {
2965 if (err == -1) {
2966 err = -errno;
2967 }
2968 v9fs_stat_free(&vs->v9stat);
2969 complete_pdu(s, vs->pdu, err);
2970 qemu_free(vs);
2971 }
2972
2973 static void v9fs_wstat_post_lstat(V9fsState *s, V9fsWstatState *vs, int err)
2974 {
2975 uint32_t v9_mode;
2976
2977 if (err == -1) {
2978 err = -errno;
2979 goto out;
2980 }
2981
2982 v9_mode = stat_to_v9mode(&vs->stbuf);
2983
2984 if ((vs->v9stat.mode & P9_STAT_MODE_TYPE_BITS) !=
2985 (v9_mode & P9_STAT_MODE_TYPE_BITS)) {
2986 /* Attempting to change the type */
2987 err = -EIO;
2988 goto out;
2989 }
2990
2991 if (v9fs_do_chmod(s, &vs->fidp->path, v9mode_to_mode(vs->v9stat.mode,
2992 &vs->v9stat.extension))) {
2993 err = -errno;
2994 }
2995 v9fs_wstat_post_chmod(s, vs, err);
2996 return;
2997
2998 out:
2999 v9fs_stat_free(&vs->v9stat);
3000 complete_pdu(s, vs->pdu, err);
3001 qemu_free(vs);
3002 }
3003
3004 static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu)
3005 {
3006 int32_t fid;
3007 V9fsWstatState *vs;
3008 int err = 0;
3009
3010 vs = qemu_malloc(sizeof(*vs));
3011 vs->pdu = pdu;
3012 vs->offset = 7;
3013
3014 pdu_unmarshal(pdu, vs->offset, "dwS", &fid, &vs->unused, &vs->v9stat);
3015
3016 vs->fidp = lookup_fid(s, fid);
3017 if (vs->fidp == NULL) {
3018 err = -EINVAL;
3019 goto out;
3020 }
3021
3022 /* do we need to sync the file? */
3023 if (donttouch_stat(&vs->v9stat)) {
3024 err = v9fs_do_fsync(s, vs->fidp->fs.fd, 0);
3025 v9fs_wstat_post_fsync(s, vs, err);
3026 return;
3027 }
3028
3029 if (vs->v9stat.mode != -1) {
3030 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
3031 v9fs_wstat_post_lstat(s, vs, err);
3032 return;
3033 }
3034
3035 v9fs_wstat_post_chmod(s, vs, err);
3036 return;
3037
3038 out:
3039 v9fs_stat_free(&vs->v9stat);
3040 complete_pdu(s, vs->pdu, err);
3041 qemu_free(vs);
3042 }
3043
3044 static void v9fs_statfs_post_statfs(V9fsState *s, V9fsStatfsState *vs, int err)
3045 {
3046 int32_t bsize_factor;
3047
3048 if (err) {
3049 err = -errno;
3050 goto out;
3051 }
3052
3053 /*
3054 * compute bsize factor based on host file system block size
3055 * and client msize
3056 */
3057 bsize_factor = (s->msize - P9_IOHDRSZ)/vs->stbuf.f_bsize;
3058 if (!bsize_factor) {
3059 bsize_factor = 1;
3060 }
3061 vs->v9statfs.f_type = vs->stbuf.f_type;
3062 vs->v9statfs.f_bsize = vs->stbuf.f_bsize;
3063 vs->v9statfs.f_bsize *= bsize_factor;
3064 /*
3065 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
3066 * adjust(divide) the number of blocks, free blocks and available
3067 * blocks by bsize factor
3068 */
3069 vs->v9statfs.f_blocks = vs->stbuf.f_blocks/bsize_factor;
3070 vs->v9statfs.f_bfree = vs->stbuf.f_bfree/bsize_factor;
3071 vs->v9statfs.f_bavail = vs->stbuf.f_bavail/bsize_factor;
3072 vs->v9statfs.f_files = vs->stbuf.f_files;
3073 vs->v9statfs.f_ffree = vs->stbuf.f_ffree;
3074 vs->v9statfs.fsid_val = (unsigned int) vs->stbuf.f_fsid.__val[0] |
3075 (unsigned long long)vs->stbuf.f_fsid.__val[1] << 32;
3076 vs->v9statfs.f_namelen = vs->stbuf.f_namelen;
3077
3078 vs->offset += pdu_marshal(vs->pdu, vs->offset, "ddqqqqqqd",
3079 vs->v9statfs.f_type, vs->v9statfs.f_bsize, vs->v9statfs.f_blocks,
3080 vs->v9statfs.f_bfree, vs->v9statfs.f_bavail, vs->v9statfs.f_files,
3081 vs->v9statfs.f_ffree, vs->v9statfs.fsid_val,
3082 vs->v9statfs.f_namelen);
3083
3084 out:
3085 complete_pdu(s, vs->pdu, vs->offset);
3086 qemu_free(vs);
3087 }
3088
3089 static void v9fs_statfs(V9fsState *s, V9fsPDU *pdu)
3090 {
3091 V9fsStatfsState *vs;
3092 ssize_t err = 0;
3093
3094 vs = qemu_malloc(sizeof(*vs));
3095 vs->pdu = pdu;
3096 vs->offset = 7;
3097
3098 memset(&vs->v9statfs, 0, sizeof(vs->v9statfs));
3099
3100 pdu_unmarshal(vs->pdu, vs->offset, "d", &vs->fid);
3101
3102 vs->fidp = lookup_fid(s, vs->fid);
3103 if (vs->fidp == NULL) {
3104 err = -ENOENT;
3105 goto out;
3106 }
3107
3108 err = v9fs_do_statfs(s, &vs->fidp->path, &vs->stbuf);
3109 v9fs_statfs_post_statfs(s, vs, err);
3110 return;
3111
3112 out:
3113 complete_pdu(s, vs->pdu, err);
3114 qemu_free(vs);
3115 }
3116
3117 static void v9fs_mknod_post_lstat(V9fsState *s, V9fsMkState *vs, int err)
3118 {
3119 if (err == -1) {
3120 err = -errno;
3121 goto out;
3122 }
3123
3124 stat_to_qid(&vs->stbuf, &vs->qid);
3125 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
3126 err = vs->offset;
3127 out:
3128 complete_pdu(s, vs->pdu, err);
3129 v9fs_string_free(&vs->fullname);
3130 v9fs_string_free(&vs->name);
3131 qemu_free(vs);
3132 }
3133
3134 static void v9fs_mknod_post_mknod(V9fsState *s, V9fsMkState *vs, int err)
3135 {
3136 if (err == -1) {
3137 err = -errno;
3138 goto out;
3139 }
3140
3141 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
3142 v9fs_mknod_post_lstat(s, vs, err);
3143 return;
3144 out:
3145 complete_pdu(s, vs->pdu, err);
3146 v9fs_string_free(&vs->fullname);
3147 v9fs_string_free(&vs->name);
3148 qemu_free(vs);
3149 }
3150
3151 static void v9fs_mknod(V9fsState *s, V9fsPDU *pdu)
3152 {
3153 int32_t fid;
3154 V9fsMkState *vs;
3155 int err = 0;
3156 V9fsFidState *fidp;
3157 gid_t gid;
3158 int mode;
3159 int major, minor;
3160
3161 vs = qemu_malloc(sizeof(*vs));
3162 vs->pdu = pdu;
3163 vs->offset = 7;
3164
3165 v9fs_string_init(&vs->fullname);
3166 pdu_unmarshal(vs->pdu, vs->offset, "dsdddd", &fid, &vs->name, &mode,
3167 &major, &minor, &gid);
3168
3169 fidp = lookup_fid(s, fid);
3170 if (fidp == NULL) {
3171 err = -ENOENT;
3172 goto out;
3173 }
3174
3175 v9fs_string_sprintf(&vs->fullname, "%s/%s", fidp->path.data, vs->name.data);
3176 err = v9fs_do_mknod(s, vs->fullname.data, mode, makedev(major, minor),
3177 fidp->uid, gid);
3178 v9fs_mknod_post_mknod(s, vs, err);
3179 return;
3180
3181 out:
3182 complete_pdu(s, vs->pdu, err);
3183 v9fs_string_free(&vs->fullname);
3184 v9fs_string_free(&vs->name);
3185 qemu_free(vs);
3186 }
3187
3188 /*
3189 * Implement posix byte range locking code
3190 * Server side handling of locking code is very simple, because 9p server in
3191 * QEMU can handle only one client. And most of the lock handling
3192 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
3193 * do any thing in * qemu 9p server side lock code path.
3194 * So when a TLOCK request comes, always return success
3195 */
3196
3197 static void v9fs_lock(V9fsState *s, V9fsPDU *pdu)
3198 {
3199 int32_t fid, err = 0;
3200 V9fsLockState *vs;
3201
3202 vs = qemu_mallocz(sizeof(*vs));
3203 vs->pdu = pdu;
3204 vs->offset = 7;
3205
3206 vs->flock = qemu_malloc(sizeof(*vs->flock));
3207 pdu_unmarshal(vs->pdu, vs->offset, "dbdqqds", &fid, &vs->flock->type,
3208 &vs->flock->flags, &vs->flock->start, &vs->flock->length,
3209 &vs->flock->proc_id, &vs->flock->client_id);
3210
3211 vs->status = P9_LOCK_ERROR;
3212
3213 /* We support only block flag now (that too ignored currently) */
3214 if (vs->flock->flags & ~P9_LOCK_FLAGS_BLOCK) {
3215 err = -EINVAL;
3216 goto out;
3217 }
3218 vs->fidp = lookup_fid(s, fid);
3219 if (vs->fidp == NULL) {
3220 err = -ENOENT;
3221 goto out;
3222 }
3223
3224 err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
3225 if (err < 0) {
3226 err = -errno;
3227 goto out;
3228 }
3229 vs->status = P9_LOCK_SUCCESS;
3230 out:
3231 vs->offset += pdu_marshal(vs->pdu, vs->offset, "b", vs->status);
3232 complete_pdu(s, vs->pdu, err);
3233 qemu_free(vs->flock);
3234 qemu_free(vs);
3235 }
3236
3237 /*
3238 * When a TGETLOCK request comes, always return success because all lock
3239 * handling is done by client's VFS layer.
3240 */
3241
3242 static void v9fs_getlock(V9fsState *s, V9fsPDU *pdu)
3243 {
3244 int32_t fid, err = 0;
3245 V9fsGetlockState *vs;
3246
3247 vs = qemu_mallocz(sizeof(*vs));
3248 vs->pdu = pdu;
3249 vs->offset = 7;
3250
3251 vs->glock = qemu_malloc(sizeof(*vs->glock));
3252 pdu_unmarshal(vs->pdu, vs->offset, "dbqqds", &fid, &vs->glock->type,
3253 &vs->glock->start, &vs->glock->length, &vs->glock->proc_id,
3254 &vs->glock->client_id);
3255
3256 vs->fidp = lookup_fid(s, fid);
3257 if (vs->fidp == NULL) {
3258 err = -ENOENT;
3259 goto out;
3260 }
3261
3262 err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
3263 if (err < 0) {
3264 err = -errno;
3265 goto out;
3266 }
3267 vs->glock->type = F_UNLCK;
3268 vs->offset += pdu_marshal(vs->pdu, vs->offset, "bqqds", vs->glock->type,
3269 vs->glock->start, vs->glock->length, vs->glock->proc_id,
3270 &vs->glock->client_id);
3271 out:
3272 complete_pdu(s, vs->pdu, err);
3273 qemu_free(vs->glock);
3274 qemu_free(vs);
3275 }
3276
3277 static void v9fs_mkdir_post_lstat(V9fsState *s, V9fsMkState *vs, int err)
3278 {
3279 if (err == -1) {
3280 err = -errno;
3281 goto out;
3282 }
3283
3284 stat_to_qid(&vs->stbuf, &vs->qid);
3285 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
3286 err = vs->offset;
3287 out:
3288 complete_pdu(s, vs->pdu, err);
3289 v9fs_string_free(&vs->fullname);
3290 v9fs_string_free(&vs->name);
3291 qemu_free(vs);
3292 }
3293
3294 static void v9fs_mkdir_post_mkdir(V9fsState *s, V9fsMkState *vs, int err)
3295 {
3296 if (err == -1) {
3297 err = -errno;
3298 goto out;
3299 }
3300
3301 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
3302 v9fs_mkdir_post_lstat(s, vs, err);
3303 return;
3304 out:
3305 complete_pdu(s, vs->pdu, err);
3306 v9fs_string_free(&vs->fullname);
3307 v9fs_string_free(&vs->name);
3308 qemu_free(vs);
3309 }
3310
3311 static void v9fs_mkdir(V9fsState *s, V9fsPDU *pdu)
3312 {
3313 int32_t fid;
3314 V9fsMkState *vs;
3315 int err = 0;
3316 V9fsFidState *fidp;
3317 gid_t gid;
3318 int mode;
3319
3320 vs = qemu_malloc(sizeof(*vs));
3321 vs->pdu = pdu;
3322 vs->offset = 7;
3323
3324 v9fs_string_init(&vs->fullname);
3325 pdu_unmarshal(vs->pdu, vs->offset, "dsdd", &fid, &vs->name, &mode,
3326 &gid);
3327
3328 fidp = lookup_fid(s, fid);
3329 if (fidp == NULL) {
3330 err = -ENOENT;
3331 goto out;
3332 }
3333
3334 v9fs_string_sprintf(&vs->fullname, "%s/%s", fidp->path.data, vs->name.data);
3335 err = v9fs_do_mkdir(s, vs->fullname.data, mode, fidp->uid, gid);
3336 v9fs_mkdir_post_mkdir(s, vs, err);
3337 return;
3338
3339 out:
3340 complete_pdu(s, vs->pdu, err);
3341 v9fs_string_free(&vs->fullname);
3342 v9fs_string_free(&vs->name);
3343 qemu_free(vs);
3344 }
3345
3346 static void v9fs_post_xattr_getvalue(V9fsState *s, V9fsXattrState *vs, int err)
3347 {
3348
3349 if (err < 0) {
3350 err = -errno;
3351 free_fid(s, vs->xattr_fidp->fid);
3352 goto out;
3353 }
3354 vs->offset += pdu_marshal(vs->pdu, vs->offset, "q", vs->size);
3355 err = vs->offset;
3356 out:
3357 complete_pdu(s, vs->pdu, err);
3358 v9fs_string_free(&vs->name);
3359 qemu_free(vs);
3360 return;
3361 }
3362
3363 static void v9fs_post_xattr_check(V9fsState *s, V9fsXattrState *vs, ssize_t err)
3364 {
3365 if (err < 0) {
3366 err = -errno;
3367 free_fid(s, vs->xattr_fidp->fid);
3368 goto out;
3369 }
3370 /*
3371 * Read the xattr value
3372 */
3373 vs->xattr_fidp->fs.xattr.len = vs->size;
3374 vs->xattr_fidp->fid_type = P9_FID_XATTR;
3375 vs->xattr_fidp->fs.xattr.copied_len = -1;
3376 if (vs->size) {
3377 vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3378 err = v9fs_do_lgetxattr(s, &vs->xattr_fidp->path,
3379 &vs->name, vs->xattr_fidp->fs.xattr.value,
3380 vs->xattr_fidp->fs.xattr.len);
3381 }
3382 v9fs_post_xattr_getvalue(s, vs, err);
3383 return;
3384 out:
3385 complete_pdu(s, vs->pdu, err);
3386 v9fs_string_free(&vs->name);
3387 qemu_free(vs);
3388 }
3389
3390 static void v9fs_post_lxattr_getvalue(V9fsState *s,
3391 V9fsXattrState *vs, int err)
3392 {
3393 if (err < 0) {
3394 err = -errno;
3395 free_fid(s, vs->xattr_fidp->fid);
3396 goto out;
3397 }
3398 vs->offset += pdu_marshal(vs->pdu, vs->offset, "q", vs->size);
3399 err = vs->offset;
3400 out:
3401 complete_pdu(s, vs->pdu, err);
3402 v9fs_string_free(&vs->name);
3403 qemu_free(vs);
3404 return;
3405 }
3406
3407 static void v9fs_post_lxattr_check(V9fsState *s,
3408 V9fsXattrState *vs, ssize_t err)
3409 {
3410 if (err < 0) {
3411 err = -errno;
3412 free_fid(s, vs->xattr_fidp->fid);
3413 goto out;
3414 }
3415 /*
3416 * Read the xattr value
3417 */
3418 vs->xattr_fidp->fs.xattr.len = vs->size;
3419 vs->xattr_fidp->fid_type = P9_FID_XATTR;
3420 vs->xattr_fidp->fs.xattr.copied_len = -1;
3421 if (vs->size) {
3422 vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3423 err = v9fs_do_llistxattr(s, &vs->xattr_fidp->path,
3424 vs->xattr_fidp->fs.xattr.value,
3425 vs->xattr_fidp->fs.xattr.len);
3426 }
3427 v9fs_post_lxattr_getvalue(s, vs, err);
3428 return;
3429 out:
3430 complete_pdu(s, vs->pdu, err);
3431 v9fs_string_free(&vs->name);
3432 qemu_free(vs);
3433 }
3434
3435 static void v9fs_xattrwalk(V9fsState *s, V9fsPDU *pdu)
3436 {
3437 ssize_t err = 0;
3438 V9fsXattrState *vs;
3439 int32_t fid, newfid;
3440
3441 vs = qemu_malloc(sizeof(*vs));
3442 vs->pdu = pdu;
3443 vs->offset = 7;
3444
3445 pdu_unmarshal(vs->pdu, vs->offset, "dds", &fid, &newfid, &vs->name);
3446 vs->file_fidp = lookup_fid(s, fid);
3447 if (vs->file_fidp == NULL) {
3448 err = -ENOENT;
3449 goto out;
3450 }
3451
3452 vs->xattr_fidp = alloc_fid(s, newfid);
3453 if (vs->xattr_fidp == NULL) {
3454 err = -EINVAL;
3455 goto out;
3456 }
3457
3458 v9fs_string_copy(&vs->xattr_fidp->path, &vs->file_fidp->path);
3459 if (vs->name.data[0] == 0) {
3460 /*
3461 * listxattr request. Get the size first
3462 */
3463 vs->size = v9fs_do_llistxattr(s, &vs->xattr_fidp->path,
3464 NULL, 0);
3465 if (vs->size < 0) {
3466 err = vs->size;
3467 }
3468 v9fs_post_lxattr_check(s, vs, err);
3469 return;
3470 } else {
3471 /*
3472 * specific xattr fid. We check for xattr
3473 * presence also collect the xattr size
3474 */
3475 vs->size = v9fs_do_lgetxattr(s, &vs->xattr_fidp->path,
3476 &vs->name, NULL, 0);
3477 if (vs->size < 0) {
3478 err = vs->size;
3479 }
3480 v9fs_post_xattr_check(s, vs, err);
3481 return;
3482 }
3483 out:
3484 complete_pdu(s, vs->pdu, err);
3485 v9fs_string_free(&vs->name);
3486 qemu_free(vs);
3487 }
3488
3489 static void v9fs_xattrcreate(V9fsState *s, V9fsPDU *pdu)
3490 {
3491 int flags;
3492 int32_t fid;
3493 ssize_t err = 0;
3494 V9fsXattrState *vs;
3495
3496 vs = qemu_malloc(sizeof(*vs));
3497 vs->pdu = pdu;
3498 vs->offset = 7;
3499
3500 pdu_unmarshal(vs->pdu, vs->offset, "dsqd",
3501 &fid, &vs->name, &vs->size, &flags);
3502
3503 vs->file_fidp = lookup_fid(s, fid);
3504 if (vs->file_fidp == NULL) {
3505 err = -EINVAL;
3506 goto out;
3507 }
3508
3509 /* Make the file fid point to xattr */
3510 vs->xattr_fidp = vs->file_fidp;
3511 vs->xattr_fidp->fid_type = P9_FID_XATTR;
3512 vs->xattr_fidp->fs.xattr.copied_len = 0;
3513 vs->xattr_fidp->fs.xattr.len = vs->size;
3514 vs->xattr_fidp->fs.xattr.flags = flags;
3515 v9fs_string_init(&vs->xattr_fidp->fs.xattr.name);
3516 v9fs_string_copy(&vs->xattr_fidp->fs.xattr.name, &vs->name);
3517 if (vs->size)
3518 vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3519 else
3520 vs->xattr_fidp->fs.xattr.value = NULL;
3521
3522 out:
3523 complete_pdu(s, vs->pdu, err);
3524 v9fs_string_free(&vs->name);
3525 qemu_free(vs);
3526 }
3527
3528 static void v9fs_readlink_post_readlink(V9fsState *s, V9fsReadLinkState *vs,
3529 int err)
3530 {
3531 if (err < 0) {
3532 err = -errno;
3533 goto out;
3534 }
3535 vs->offset += pdu_marshal(vs->pdu, vs->offset, "s", &vs->target);
3536 err = vs->offset;
3537 out:
3538 complete_pdu(s, vs->pdu, err);
3539 v9fs_string_free(&vs->target);
3540 qemu_free(vs);
3541 }
3542
3543 static void v9fs_readlink(V9fsState *s, V9fsPDU *pdu)
3544 {
3545 int32_t fid;
3546 V9fsReadLinkState *vs;
3547 int err = 0;
3548 V9fsFidState *fidp;
3549
3550 vs = qemu_malloc(sizeof(*vs));
3551 vs->pdu = pdu;
3552 vs->offset = 7;
3553
3554 pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
3555
3556 fidp = lookup_fid(s, fid);
3557 if (fidp == NULL) {
3558 err = -ENOENT;
3559 goto out;
3560 }
3561
3562 v9fs_string_init(&vs->target);
3563 err = v9fs_do_readlink(s, &fidp->path, &vs->target);
3564 v9fs_readlink_post_readlink(s, vs, err);
3565 return;
3566 out:
3567 complete_pdu(s, vs->pdu, err);
3568 qemu_free(vs);
3569 }
3570
3571 typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu);
3572
3573 static pdu_handler_t *pdu_handlers[] = {
3574 [P9_TREADDIR] = v9fs_readdir,
3575 [P9_TSTATFS] = v9fs_statfs,
3576 [P9_TGETATTR] = v9fs_getattr,
3577 [P9_TSETATTR] = v9fs_setattr,
3578 [P9_TXATTRWALK] = v9fs_xattrwalk,
3579 [P9_TXATTRCREATE] = v9fs_xattrcreate,
3580 [P9_TMKNOD] = v9fs_mknod,
3581 [P9_TRENAME] = v9fs_rename,
3582 [P9_TLOCK] = v9fs_lock,
3583 [P9_TGETLOCK] = v9fs_getlock,
3584 [P9_TREADLINK] = v9fs_readlink,
3585 [P9_TMKDIR] = v9fs_mkdir,
3586 [P9_TVERSION] = v9fs_version,
3587 [P9_TLOPEN] = v9fs_open,
3588 [P9_TATTACH] = v9fs_attach,
3589 [P9_TSTAT] = v9fs_stat,
3590 [P9_TWALK] = v9fs_walk,
3591 [P9_TCLUNK] = v9fs_clunk,
3592 [P9_TFSYNC] = v9fs_fsync,
3593 [P9_TOPEN] = v9fs_open,
3594 [P9_TREAD] = v9fs_read,
3595 #if 0
3596 [P9_TAUTH] = v9fs_auth,
3597 #endif
3598 [P9_TFLUSH] = v9fs_flush,
3599 [P9_TLINK] = v9fs_link,
3600 [P9_TSYMLINK] = v9fs_symlink,
3601 [P9_TCREATE] = v9fs_create,
3602 [P9_TLCREATE] = v9fs_lcreate,
3603 [P9_TWRITE] = v9fs_write,
3604 [P9_TWSTAT] = v9fs_wstat,
3605 [P9_TREMOVE] = v9fs_remove,
3606 };
3607
3608 static void v9fs_op_not_supp(V9fsState *s, V9fsPDU *pdu)
3609 {
3610 complete_pdu(s, pdu, -EOPNOTSUPP);
3611 }
3612
3613 static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
3614 {
3615 pdu_handler_t *handler;
3616
3617 if (debug_9p_pdu) {
3618 pprint_pdu(pdu);
3619 }
3620 if (pdu->id >= ARRAY_SIZE(pdu_handlers) ||
3621 (pdu_handlers[pdu->id] == NULL)) {
3622 handler = v9fs_op_not_supp;
3623 } else {
3624 handler = pdu_handlers[pdu->id];
3625 }
3626 handler(s, pdu);
3627 }
3628
3629 void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
3630 {
3631 V9fsState *s = (V9fsState *)vdev;
3632 V9fsPDU *pdu;
3633 ssize_t len;
3634
3635 while ((pdu = alloc_pdu(s)) &&
3636 (len = virtqueue_pop(vq, &pdu->elem)) != 0) {
3637 uint8_t *ptr;
3638
3639 BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0);
3640 BUG_ON(pdu->elem.out_sg[0].iov_len < 7);
3641
3642 ptr = pdu->elem.out_sg[0].iov_base;
3643
3644 memcpy(&pdu->size, ptr, 4);
3645 pdu->id = ptr[4];
3646 memcpy(&pdu->tag, ptr + 5, 2);
3647
3648 submit_pdu(s, pdu);
3649 }
3650
3651 free_pdu(s, pdu);
3652 }
9p server code using virtio transport