]> Git Repo - qemu.git/blame - hw/virtio-9p.c
projects / qemu.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
qdev: Fix comment around qdev_init_nofail()
[qemu.git] / hw / virtio-9p.c
CommitLineData
9f107513
AL		 1/*
2 * Virtio 9p backend
3 *
4 * Copyright IBM, Corp. 2010
5 *
6 * Authors:
7 * Anthony Liguori <[email protected]>
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"
fc22118d 20#include "virtio-9p-xattr.h"
9f107513 21
9f107513
AL		 22int debug_9p_pdu;
23
fac4f111
VJ		 24enum {
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
36static 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
758e8e38 70void cred_init(FsCred *credp)
131dcb25 71{
758e8e38
VJ		 72 credp->fc_uid = -1;
73 credp->fc_gid = -1;
74 credp->fc_mode = -1;
75 credp->fc_rdev = -1;
131dcb25
AL		 76}
77
758e8e38 78static int v9fs_do_lstat(V9fsState *s, V9fsString *path, struct stat *stbuf)
131dcb25 79{
758e8e38 80 return s->ops->lstat(&s->ctx, path->data, stbuf);
131dcb25
AL		 81}
82
83static 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
98static int v9fs_do_close(V9fsState *s, int fd)
99{
100 return s->ops->close(&s->ctx, fd);
101}
102
103static int v9fs_do_closedir(V9fsState *s, DIR *dir)
104{
105 return s->ops->closedir(&s->ctx, dir);
106}
107
a6568fe2
AL		 108static int v9fs_do_open(V9fsState *s, V9fsString *path, int flags)
109{
110 return s->ops->open(&s->ctx, path->data, flags);
111}
112
113static DIR *v9fs_do_opendir(V9fsState *s, V9fsString *path)
114{
115 return s->ops->opendir(&s->ctx, path->data);
116}
117
a9231555
AL		 118static void v9fs_do_rewinddir(V9fsState *s, DIR *dir)
119{
120 return s->ops->rewinddir(&s->ctx, dir);
121}
122
123static off_t v9fs_do_telldir(V9fsState *s, DIR *dir)
124{
125 return s->ops->telldir(&s->ctx, dir);
126}
127
128static struct dirent *v9fs_do_readdir(V9fsState *s, DIR *dir)
129{
130 return s->ops->readdir(&s->ctx, dir);
131}
132
133static void v9fs_do_seekdir(V9fsState *s, DIR *dir, off_t off)
134{
135 return s->ops->seekdir(&s->ctx, dir, off);
136}
137
56d15a53
SG		 138static int v9fs_do_preadv(V9fsState *s, int fd, const struct iovec *iov,
139 int iovcnt, int64_t offset)
a9231555 140{
56d15a53 141 return s->ops->preadv(&s->ctx, fd, iov, iovcnt, offset);
a9231555
AL		 142}
143
56d15a53
SG		 144static int v9fs_do_pwritev(V9fsState *s, int fd, const struct iovec *iov,
145 int iovcnt, int64_t offset)
a9231555 146{
56d15a53 147 return s->ops->pwritev(&s->ctx, fd, iov, iovcnt, offset);
8449360c
AL		 148}
149
c494dd6f
AL		 150static int v9fs_do_chmod(V9fsState *s, V9fsString *path, mode_t mode)
151{
e95ead32
VJ		 152 FsCred cred;
153 cred_init(&cred);
154 cred.fc_mode = mode;
155 return s->ops->chmod(&s->ctx, path->data, &cred);
c494dd6f
AL		 156}
157
5268cecc
MK		 158static int v9fs_do_mknod(V9fsState *s, char *name,
159 mode_t mode, dev_t dev, uid_t uid, gid_t gid)
c494dd6f 160{
1c293312
VJ		 161 FsCred cred;
162 cred_init(&cred);
5268cecc
MK		 163 cred.fc_uid = uid;
164 cred.fc_gid = gid;
1c293312
VJ		 165 cred.fc_mode = mode;
166 cred.fc_rdev = dev;
5268cecc 167 return s->ops->mknod(&s->ctx, name, &cred);
c494dd6f
AL		 168}
169
b67592ea
MK		 170static int v9fs_do_mkdir(V9fsState *s, char *name, mode_t mode,
171 uid_t uid, gid_t gid)
c494dd6f 172{
00ec5c37
VJ		 173 FsCred cred;
174
175 cred_init(&cred);
b67592ea
MK		 176 cred.fc_uid = uid;
177 cred.fc_gid = gid;
178 cred.fc_mode = mode;
00ec5c37 179
b67592ea 180 return s->ops->mkdir(&s->ctx, name, &cred);
c494dd6f
AL		 181}
182
183static int v9fs_do_fstat(V9fsState *s, int fd, struct stat *stbuf)
184{
185 return s->ops->fstat(&s->ctx, fd, stbuf);
186}
187
c1568af5
VJ		 188static int v9fs_do_open2(V9fsState *s, char *fullname, uid_t uid, gid_t gid,
189 int flags, int mode)
c494dd6f 190{
4750a96f 191 FsCred cred;
4750a96f
VJ		 192
193 cred_init(&cred);
c1568af5
VJ		 194 cred.fc_uid = uid;
195 cred.fc_gid = gid;
196 cred.fc_mode = mode & 07777;
197 flags = flags;
4750a96f 198
c1568af5 199 return s->ops->open2(&s->ctx, fullname, flags, &cred);
c494dd6f
AL		 200}
201
08c60fc9
VJ		 202static int v9fs_do_symlink(V9fsState *s, V9fsFidState *fidp,
203 const char *oldpath, const char *newpath, gid_t gid)
c494dd6f 204{
879c2813
VJ		 205 FsCred cred;
206 cred_init(&cred);
08c60fc9
VJ		 207 cred.fc_uid = fidp->uid;
208 cred.fc_gid = gid;
209 cred.fc_mode = 0777;
879c2813 210
08c60fc9 211 return s->ops->symlink(&s->ctx, oldpath, newpath, &cred);
c494dd6f
AL		 212}
213
214static int v9fs_do_link(V9fsState *s, V9fsString *oldpath, V9fsString *newpath)
215{
216 return s->ops->link(&s->ctx, oldpath->data, newpath->data);
217}
218
8cf89e00
AL		 219static int v9fs_do_truncate(V9fsState *s, V9fsString *path, off_t size)
220{
221 return s->ops->truncate(&s->ctx, path->data, size);
222}
223
224static 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
230static int v9fs_do_chown(V9fsState *s, V9fsString *path, uid_t uid, gid_t gid)
231{
f7613bee
VJ		 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);
8cf89e00
AL		 238}
239
8fc39ae4
SK		 240static int v9fs_do_utimensat(V9fsState *s, V9fsString *path,
241 const struct timespec times[2])
8cf89e00 242{
8fc39ae4 243 return s->ops->utimensat(&s->ctx, path->data, times);
8cf89e00
AL		 244}
245
5bae1900
AL		 246static int v9fs_do_remove(V9fsState *s, V9fsString *path)
247{
248 return s->ops->remove(&s->ctx, path->data);
249}
250
49594973 251static int v9fs_do_fsync(V9fsState *s, int fd, int datasync)
8cf89e00 252{
49594973 253 return s->ops->fsync(&s->ctx, fd, datasync);
8cf89e00
AL		 254}
255
5e94c103
MK		 256static int v9fs_do_statfs(V9fsState *s, V9fsString *path, struct statfs *stbuf)
257{
258 return s->ops->statfs(&s->ctx, path->data, stbuf);
259}
260
fa32ef88
AK		 261static 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
269static 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
10b468bd
AK		 276static 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
9ed3ef26
AK		 284static 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
a03f7874
AL		 292static void v9fs_string_init(V9fsString *str)
293{
294 str->data = NULL;
295 str->size = 0;
296}
297
298static void v9fs_string_free(V9fsString *str)
299{
300 qemu_free(str->data);
301 str->data = NULL;
302 str->size = 0;
303}
304
305static void v9fs_string_null(V9fsString *str)
306{
307 v9fs_string_free(str);
308}
309
310static 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 }
45b23ff8
VJ		 324 case 'U': {
325 unsigned long num = *(unsigned long *)arg;
326 do {
327 ret++;
328 num = num/10;
329 } while (num);
330 break;
331 }
a03f7874
AL		 332 default:
333 printf("Number_to_string: Unknown number format\n");
334 return -1;
335 }
336
337 return ret;
338}
339
c9ba47dc
SW		 340static int GCC_FMT_ATTR(2, 0)
341v9fs_string_alloc_printf(char **strp, const char *fmt, va_list ap)
a03f7874
AL		 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;
45b23ff8 349 unsigned long arg_ulong;
a03f7874
AL		 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;
45b23ff8
VJ		 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;
a03f7874
AL		 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
398alloc_print:
399 *strp = qemu_malloc((len + 1) * sizeof(**strp));
400
401 return vsprintf(*strp, fmt, ap);
402}
403
c9ba47dc
SW		 404static void GCC_FMT_ATTR(2, 3)
405v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
a03f7874
AL		 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
420static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
421{
422 v9fs_string_free(lhs);
423 v9fs_string_sprintf(lhs, "%s", rhs->data);
424}
425
426static size_t v9fs_string_size(V9fsString *str)
427{
428 return str->size;
429}
430
286d5652
AL		 431static 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) {
286d5652
AL		 437 return f;
438 }
439 }
440
441 return NULL;
442}
443
444static 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;
d62dbb51 456 f->fid_type = P9_FID_NONE;
286d5652
AL		 457
458 f->next = s->fid_list;
459 s->fid_list = f;
460
461 return f;
462}
463
10b468bd
AK		 464static 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 }
9ed3ef26
AK		 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 }
10b468bd
AK		 489free_out:
490 v9fs_string_free(&fidp->fs.xattr.name);
491free_value:
492 if (fidp->fs.xattr.value) {
493 qemu_free(fidp->fs.xattr.value);
494 }
495 return retval;
496}
497
286d5652
AL		 498static int free_fid(V9fsState *s, int32_t fid)
499{
10b468bd 500 int retval = 0;
286d5652
AL		 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
d62dbb51
AK		 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) {
10b468bd 521 retval = v9fs_xattr_fid_clunk(s, fidp);
286d5652
AL		 522 }
523 v9fs_string_free(&fidp->path);
524 qemu_free(fidp);
525
10b468bd 526 return retval;
286d5652
AL		 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 */
555static 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
571static 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
9f107513
AL		 585static 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
596static void free_pdu(V9fsState *s, V9fsPDU *pdu)
597{
598 if (pdu) {
599 QLIST_INSERT_HEAD(&s->free_list, pdu, next);
600 }
601}
602
603size_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
405a549a
AL		 635static 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
641static 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
648static 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
682static 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 val = le16_to_cpupu(valp);
700 offset += pdu_unpack(&val, pdu, offset, sizeof(val));
701 *valp = val;
702 break;
703 }
704 case 'd': {
705 uint32_t val, *valp;
706 valp = va_arg(ap, uint32_t *);
707 val = le32_to_cpupu(valp);
708 offset += pdu_unpack(&val, pdu, offset, sizeof(val));
709 *valp = val;
710 break;
711 }
712 case 'q': {
713 uint64_t val, *valp;
714 valp = va_arg(ap, uint64_t *);
715 val = le64_to_cpup(valp);
716 offset += pdu_unpack(&val, pdu, offset, sizeof(val));
717 *valp = val;
718 break;
719 }
720 case 'v': {
721 struct iovec *iov = va_arg(ap, struct iovec *);
722 int *iovcnt = va_arg(ap, int *);
723 *iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
724 break;
725 }
726 case 's': {
727 V9fsString *str = va_arg(ap, V9fsString *);
728 offset += pdu_unmarshal(pdu, offset, "w", &str->size);
729 /* FIXME: sanity check str->size */
730 str->data = qemu_malloc(str->size + 1);
731 offset += pdu_unpack(str->data, pdu, offset, str->size);
732 str->data[str->size] = 0;
733 break;
734 }
735 case 'Q': {
736 V9fsQID *qidp = va_arg(ap, V9fsQID *);
737 offset += pdu_unmarshal(pdu, offset, "bdq",
738 &qidp->type, &qidp->version, &qidp->path);
739 break;
740 }
741 case 'S': {
742 V9fsStat *statp = va_arg(ap, V9fsStat *);
743 offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
744 &statp->size, &statp->type, &statp->dev,
745 &statp->qid, &statp->mode, &statp->atime,
746 &statp->mtime, &statp->length,
747 &statp->name, &statp->uid, &statp->gid,
748 &statp->muid, &statp->extension,
749 &statp->n_uid, &statp->n_gid,
750 &statp->n_muid);
751 break;
752 }
c79ce737
SK		 753 case 'I': {
754 V9fsIattr *iattr = va_arg(ap, V9fsIattr *);
755 offset += pdu_unmarshal(pdu, offset, "ddddqqqqq",
756 &iattr->valid, &iattr->mode,
757 &iattr->uid, &iattr->gid, &iattr->size,
758 &iattr->atime_sec, &iattr->atime_nsec,
759 &iattr->mtime_sec, &iattr->mtime_nsec);
760 break;
761 }
405a549a
AL		 762 default:
763 break;
764 }
765 }
766
767 va_end(ap);
768
769 return offset - old_offset;
770}
771
772static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
773{
774 size_t old_offset = offset;
775 va_list ap;
776 int i;
777
778 va_start(ap, fmt);
779 for (i = 0; fmt[i]; i++) {
780 switch (fmt[i]) {
781 case 'b': {
782 uint8_t val = va_arg(ap, int);
783 offset += pdu_pack(pdu, offset, &val, sizeof(val));
784 break;
785 }
786 case 'w': {
787 uint16_t val;
788 cpu_to_le16w(&val, va_arg(ap, int));
789 offset += pdu_pack(pdu, offset, &val, sizeof(val));
790 break;
791 }
792 case 'd': {
793 uint32_t val;
794 cpu_to_le32w(&val, va_arg(ap, uint32_t));
795 offset += pdu_pack(pdu, offset, &val, sizeof(val));
796 break;
797 }
798 case 'q': {
799 uint64_t val;
800 cpu_to_le64w(&val, va_arg(ap, uint64_t));
801 offset += pdu_pack(pdu, offset, &val, sizeof(val));
802 break;
803 }
804 case 'v': {
805 struct iovec *iov = va_arg(ap, struct iovec *);
806 int *iovcnt = va_arg(ap, int *);
807 *iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
808 break;
809 }
810 case 's': {
811 V9fsString *str = va_arg(ap, V9fsString *);
812 offset += pdu_marshal(pdu, offset, "w", str->size);
813 offset += pdu_pack(pdu, offset, str->data, str->size);
814 break;
815 }
816 case 'Q': {
817 V9fsQID *qidp = va_arg(ap, V9fsQID *);
818 offset += pdu_marshal(pdu, offset, "bdq",
819 qidp->type, qidp->version, qidp->path);
820 break;
821 }
822 case 'S': {
823 V9fsStat *statp = va_arg(ap, V9fsStat *);
824 offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
825 statp->size, statp->type, statp->dev,
826 &statp->qid, statp->mode, statp->atime,
827 statp->mtime, statp->length, &statp->name,
828 &statp->uid, &statp->gid, &statp->muid,
829 &statp->extension, statp->n_uid,
830 statp->n_gid, statp->n_muid);
831 break;
832 }
00ede4c2
SK		 833 case 'A': {
834 V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *);
835 offset += pdu_marshal(pdu, offset, "qQdddqqqqqqqqqqqqqqq",
836 statp->st_result_mask,
837 &statp->qid, statp->st_mode,
838 statp->st_uid, statp->st_gid,
839 statp->st_nlink, statp->st_rdev,
840 statp->st_size, statp->st_blksize, statp->st_blocks,
841 statp->st_atime_sec, statp->st_atime_nsec,
842 statp->st_mtime_sec, statp->st_mtime_nsec,
843 statp->st_ctime_sec, statp->st_ctime_nsec,
844 statp->st_btime_sec, statp->st_btime_nsec,
845 statp->st_gen, statp->st_data_version);
846 break;
847 }
405a549a
AL		 848 default:
849 break;
850 }
851 }
852 va_end(ap);
853
854 return offset - old_offset;
855}
856
857static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
858{
859 int8_t id = pdu->id + 1; /* Response */
860
861 if (len < 0) {
405a549a 862 int err = -len;
8f4d1ca5 863 len = 7;
405a549a 864
8f4d1ca5
AB		 865 if (s->proto_version != V9FS_PROTO_2000L) {
866 V9fsString str;
867
868 str.data = strerror(err);
869 str.size = strlen(str.data);
870
871 len += pdu_marshal(pdu, len, "s", &str);
872 id = P9_RERROR;
873 }
405a549a 874
cf03eb2c 875 len += pdu_marshal(pdu, len, "d", err);
405a549a 876
8f4d1ca5
AB		 877 if (s->proto_version == V9FS_PROTO_2000L) {
878 id = P9_RLERROR;
879 }
405a549a
AL		 880 }
881
882 /* fill out the header */
883 pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);
884
885 /* keep these in sync */
886 pdu->size = len;
887 pdu->id = id;
888
889 /* push onto queue and notify */
890 virtqueue_push(s->vq, &pdu->elem, len);
891
892 /* FIXME: we should batch these completions */
893 virtio_notify(&s->vdev, s->vq);
894
895 free_pdu(s, pdu);
896}
897
bb9e3216
AL		 898static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
899{
900 mode_t ret;
901
902 ret = mode & 0777;
903 if (mode & P9_STAT_MODE_DIR) {
904 ret |= S_IFDIR;
905 }
906
cf03eb2c
AB		 907 if (mode & P9_STAT_MODE_SYMLINK) {
908 ret |= S_IFLNK;
909 }
910 if (mode & P9_STAT_MODE_SOCKET) {
911 ret |= S_IFSOCK;
912 }
913 if (mode & P9_STAT_MODE_NAMED_PIPE) {
914 ret |= S_IFIFO;
915 }
916 if (mode & P9_STAT_MODE_DEVICE) {
917 if (extension && extension->data[0] == 'c') {
918 ret |= S_IFCHR;
919 } else {
920 ret |= S_IFBLK;
bb9e3216
AL		 921 }
922 }
923
924 if (!(ret&~0777)) {
925 ret |= S_IFREG;
926 }
927
928 if (mode & P9_STAT_MODE_SETUID) {
929 ret |= S_ISUID;
930 }
931 if (mode & P9_STAT_MODE_SETGID) {
932 ret |= S_ISGID;
933 }
934 if (mode & P9_STAT_MODE_SETVTX) {
935 ret |= S_ISVTX;
936 }
937
938 return ret;
939}
940
941static int donttouch_stat(V9fsStat *stat)
942{
943 if (stat->type == -1 &&
944 stat->dev == -1 &&
945 stat->qid.type == -1 &&
946 stat->qid.version == -1 &&
947 stat->qid.path == -1 &&
948 stat->mode == -1 &&
949 stat->atime == -1 &&
950 stat->mtime == -1 &&
951 stat->length == -1 &&
952 !stat->name.size &&
953 !stat->uid.size &&
954 !stat->gid.size &&
955 !stat->muid.size &&
956 stat->n_uid == -1 &&
957 stat->n_gid == -1 &&
958 stat->n_muid == -1) {
959 return 1;
960 }
961
962 return 0;
963}
964
965static void v9fs_stat_free(V9fsStat *stat)
966{
967 v9fs_string_free(&stat->name);
968 v9fs_string_free(&stat->uid);
969 v9fs_string_free(&stat->gid);
970 v9fs_string_free(&stat->muid);
971 v9fs_string_free(&stat->extension);
972}
973
974static uint32_t stat_to_v9mode(const struct stat *stbuf)
975{
976 uint32_t mode;
977
978 mode = stbuf->st_mode & 0777;
979 if (S_ISDIR(stbuf->st_mode)) {
980 mode |= P9_STAT_MODE_DIR;
981 }
982
cf03eb2c
AB		 983 if (S_ISLNK(stbuf->st_mode)) {
984 mode |= P9_STAT_MODE_SYMLINK;
985 }
bb9e3216 986
cf03eb2c
AB		 987 if (S_ISSOCK(stbuf->st_mode)) {
988 mode |= P9_STAT_MODE_SOCKET;
989 }
bb9e3216 990
cf03eb2c
AB		 991 if (S_ISFIFO(stbuf->st_mode)) {
992 mode |= P9_STAT_MODE_NAMED_PIPE;
993 }
bb9e3216 994
cf03eb2c
AB		 995 if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
996 mode |= P9_STAT_MODE_DEVICE;
997 }
bb9e3216 998
cf03eb2c
AB		 999 if (stbuf->st_mode & S_ISUID) {
1000 mode |= P9_STAT_MODE_SETUID;
1001 }
bb9e3216 1002
cf03eb2c
AB		 1003 if (stbuf->st_mode & S_ISGID) {
1004 mode |= P9_STAT_MODE_SETGID;
1005 }
bb9e3216 1006
cf03eb2c
AB		 1007 if (stbuf->st_mode & S_ISVTX) {
1008 mode |= P9_STAT_MODE_SETVTX;
bb9e3216
AL		 1009 }
1010
1011 return mode;
1012}
1013
1014static int stat_to_v9stat(V9fsState *s, V9fsString *name,
1015 const struct stat *stbuf,
1016 V9fsStat *v9stat)
1017{
1018 int err;
1019 const char *str;
1020
1021 memset(v9stat, 0, sizeof(*v9stat));
1022
1023 stat_to_qid(stbuf, &v9stat->qid);
1024 v9stat->mode = stat_to_v9mode(stbuf);
1025 v9stat->atime = stbuf->st_atime;
1026 v9stat->mtime = stbuf->st_mtime;
1027 v9stat->length = stbuf->st_size;
1028
1029 v9fs_string_null(&v9stat->uid);
1030 v9fs_string_null(&v9stat->gid);
1031 v9fs_string_null(&v9stat->muid);
1032
cf03eb2c
AB		 1033 v9stat->n_uid = stbuf->st_uid;
1034 v9stat->n_gid = stbuf->st_gid;
1035 v9stat->n_muid = 0;
bb9e3216 1036
cf03eb2c 1037 v9fs_string_null(&v9stat->extension);
bb9e3216 1038
cf03eb2c
AB		 1039 if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
1040 err = v9fs_do_readlink(s, name, &v9stat->extension);
1041 if (err == -1) {
1042 err = -errno;
1043 return err;
bb9e3216 1044 }
cf03eb2c
AB		 1045 v9stat->extension.data[err] = 0;
1046 v9stat->extension.size = err;
1047 } else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
1048 v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
1049 S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
1050 major(stbuf->st_rdev), minor(stbuf->st_rdev));
1051 } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
c9ba47dc
SW		 1052 v9fs_string_sprintf(&v9stat->extension, "%s %lu",
1053 "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
bb9e3216
AL		 1054 }
1055
1056 str = strrchr(name->data, '/');
1057 if (str) {
1058 str += 1;
1059 } else {
1060 str = name->data;
1061 }
1062
1063 v9fs_string_sprintf(&v9stat->name, "%s", str);
1064
1065 v9stat->size = 61 +
1066 v9fs_string_size(&v9stat->name) +
1067 v9fs_string_size(&v9stat->uid) +
1068 v9fs_string_size(&v9stat->gid) +
1069 v9fs_string_size(&v9stat->muid) +
1070 v9fs_string_size(&v9stat->extension);
1071 return 0;
1072}
1073
00ede4c2
SK		 1074#define P9_STATS_MODE 0x00000001ULL
1075#define P9_STATS_NLINK 0x00000002ULL
1076#define P9_STATS_UID 0x00000004ULL
1077#define P9_STATS_GID 0x00000008ULL
1078#define P9_STATS_RDEV 0x00000010ULL
1079#define P9_STATS_ATIME 0x00000020ULL
1080#define P9_STATS_MTIME 0x00000040ULL
1081#define P9_STATS_CTIME 0x00000080ULL
1082#define P9_STATS_INO 0x00000100ULL
1083#define P9_STATS_SIZE 0x00000200ULL
1084#define P9_STATS_BLOCKS 0x00000400ULL
1085
1086#define P9_STATS_BTIME 0x00000800ULL
1087#define P9_STATS_GEN 0x00001000ULL
1088#define P9_STATS_DATA_VERSION 0x00002000ULL
1089
1090#define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
1091#define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
1092
1093
1094static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
1095 V9fsStatDotl *v9lstat)
1096{
1097 memset(v9lstat, 0, sizeof(*v9lstat));
1098
1099 v9lstat->st_mode = stbuf->st_mode;
1100 v9lstat->st_nlink = stbuf->st_nlink;
1101 v9lstat->st_uid = stbuf->st_uid;
1102 v9lstat->st_gid = stbuf->st_gid;
1103 v9lstat->st_rdev = stbuf->st_rdev;
1104 v9lstat->st_size = stbuf->st_size;
1105 v9lstat->st_blksize = stbuf->st_blksize;
1106 v9lstat->st_blocks = stbuf->st_blocks;
1107 v9lstat->st_atime_sec = stbuf->st_atime;
1108 v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
1109 v9lstat->st_mtime_sec = stbuf->st_mtime;
1110 v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
1111 v9lstat->st_ctime_sec = stbuf->st_ctime;
1112 v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
1113 /* Currently we only support BASIC fields in stat */
1114 v9lstat->st_result_mask = P9_STATS_BASIC;
1115
1116 stat_to_qid(stbuf, &v9lstat->qid);
1117}
1118
1f5a89bf
AL		 1119static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt)
1120{
1121 while (len && *iovcnt) {
1122 if (len < sg->iov_len) {
1123 sg->iov_len -= len;
1124 sg->iov_base += len;
1125 len = 0;
1126 } else {
1127 len -= sg->iov_len;
1128 sg++;
1129 *iovcnt -= 1;
1130 }
1131 }
1132
1133 return sg;
1134}
1135
1136static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt)
1137{
1138 int i;
1139 int total = 0;
1140
1141 for (i = 0; i < *cnt; i++) {
1142 if ((total + sg[i].iov_len) > cap) {
1143 sg[i].iov_len -= ((total + sg[i].iov_len) - cap);
1144 i++;
1145 break;
1146 }
1147 total += sg[i].iov_len;
1148 }
1149
1150 *cnt = i;
1151
1152 return sg;
1153}
1154
1155static void print_sg(struct iovec *sg, int cnt)
1156{
1157 int i;
1158
1159 printf("sg[%d]: {", cnt);
1160 for (i = 0; i < cnt; i++) {
1161 if (i) {
1162 printf(", ");
1163 }
1164 printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
1165 }
1166 printf("}\n");
1167}
1168
8cf89e00
AL		 1169static void v9fs_fix_path(V9fsString *dst, V9fsString *src, int len)
1170{
1171 V9fsString str;
1172 v9fs_string_init(&str);
1173 v9fs_string_copy(&str, dst);
1174 v9fs_string_sprintf(dst, "%s%s", src->data, str.data+len);
1175 v9fs_string_free(&str);
1176}
1177
9f107513
AL		 1178static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
1179{
92c1ad03
AL		 1180 V9fsString version;
1181 size_t offset = 7;
1182
5e94c103 1183 pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
92c1ad03 1184
84151514
MK		 1185 if (!strcmp(version.data, "9P2000.u")) {
1186 s->proto_version = V9FS_PROTO_2000U;
1187 } else if (!strcmp(version.data, "9P2000.L")) {
1188 s->proto_version = V9FS_PROTO_2000L;
1189 } else {
92c1ad03 1190 v9fs_string_sprintf(&version, "unknown");
9f107513 1191 }
92c1ad03 1192
5e94c103 1193 offset += pdu_marshal(pdu, offset, "ds", s->msize, &version);
92c1ad03
AL		 1194 complete_pdu(s, pdu, offset);
1195
1196 v9fs_string_free(&version);
9f107513
AL		 1197}
1198
1199static void v9fs_attach(V9fsState *s, V9fsPDU *pdu)
1200{
955efc47
AL		 1201 int32_t fid, afid, n_uname;
1202 V9fsString uname, aname;
1203 V9fsFidState *fidp;
1204 V9fsQID qid;
1205 size_t offset = 7;
1206 ssize_t err;
1207
1208 pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname);
1209
1210 fidp = alloc_fid(s, fid);
1211 if (fidp == NULL) {
1212 err = -EINVAL;
1213 goto out;
9f107513 1214 }
955efc47
AL		 1215
1216 fidp->uid = n_uname;
1217
1218 v9fs_string_sprintf(&fidp->path, "%s", "/");
1219 err = fid_to_qid(s, fidp, &qid);
1220 if (err) {
1221 err = -EINVAL;
1222 free_fid(s, fid);
1223 goto out;
1224 }
1225
1226 offset += pdu_marshal(pdu, offset, "Q", &qid);
1227
1228 err = offset;
1229out:
1230 complete_pdu(s, pdu, err);
1231 v9fs_string_free(&uname);
1232 v9fs_string_free(&aname);
9f107513
AL		 1233}
1234
4da7d3fa
AL		 1235static void v9fs_stat_post_lstat(V9fsState *s, V9fsStatState *vs, int err)
1236{
1237 if (err == -1) {
1238 err = -errno;
1239 goto out;
1240 }
1241
1242 err = stat_to_v9stat(s, &vs->fidp->path, &vs->stbuf, &vs->v9stat);
1243 if (err) {
1244 goto out;
1245 }
1246 vs->offset += pdu_marshal(vs->pdu, vs->offset, "wS", 0, &vs->v9stat);
1247 err = vs->offset;
1248
1249out:
1250 complete_pdu(s, vs->pdu, err);
1251 v9fs_stat_free(&vs->v9stat);
1252 qemu_free(vs);
1253}
1254
9f107513
AL		 1255static void v9fs_stat(V9fsState *s, V9fsPDU *pdu)
1256{
4da7d3fa
AL		 1257 int32_t fid;
1258 V9fsStatState *vs;
1259 ssize_t err = 0;
1260
1261 vs = qemu_malloc(sizeof(*vs));
1262 vs->pdu = pdu;
1263 vs->offset = 7;
1264
1265 memset(&vs->v9stat, 0, sizeof(vs->v9stat));
1266
1267 pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
1268
1269 vs->fidp = lookup_fid(s, fid);
1270 if (vs->fidp == NULL) {
1271 err = -ENOENT;
1272 goto out;
9f107513 1273 }
4da7d3fa
AL		 1274
1275 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1276 v9fs_stat_post_lstat(s, vs, err);
1277 return;
1278
1279out:
1280 complete_pdu(s, vs->pdu, err);
1281 v9fs_stat_free(&vs->v9stat);
1282 qemu_free(vs);
9f107513
AL		 1283}
1284
00ede4c2
SK		 1285static void v9fs_getattr_post_lstat(V9fsState *s, V9fsStatStateDotl *vs,
1286 int err)
1287{
1288 if (err == -1) {
1289 err = -errno;
1290 goto out;
1291 }
1292
1293 stat_to_v9stat_dotl(s, &vs->stbuf, &vs->v9stat_dotl);
1294 vs->offset += pdu_marshal(vs->pdu, vs->offset, "A", &vs->v9stat_dotl);
1295 err = vs->offset;
1296
1297out:
1298 complete_pdu(s, vs->pdu, err);
1299 qemu_free(vs);
1300}
1301
1302static void v9fs_getattr(V9fsState *s, V9fsPDU *pdu)
1303{
1304 int32_t fid;
1305 V9fsStatStateDotl *vs;
1306 ssize_t err = 0;
1307 V9fsFidState *fidp;
1308 uint64_t request_mask;
1309
1310 vs = qemu_malloc(sizeof(*vs));
1311 vs->pdu = pdu;
1312 vs->offset = 7;
1313
1314 memset(&vs->v9stat_dotl, 0, sizeof(vs->v9stat_dotl));
1315
1316 pdu_unmarshal(vs->pdu, vs->offset, "dq", &fid, &request_mask);
1317
1318 fidp = lookup_fid(s, fid);
1319 if (fidp == NULL) {
1320 err = -ENOENT;
1321 goto out;
1322 }
1323
1324 /* Currently we only support BASIC fields in stat, so there is no
1325 * need to look at request_mask.
1326 */
1327 err = v9fs_do_lstat(s, &fidp->path, &vs->stbuf);
1328 v9fs_getattr_post_lstat(s, vs, err);
1329 return;
1330
1331out:
1332 complete_pdu(s, vs->pdu, err);
1333 qemu_free(vs);
1334}
1335
c79ce737
SK		 1336/* From Linux kernel code */
1337#define ATTR_MODE (1 << 0)
1338#define ATTR_UID (1 << 1)
1339#define ATTR_GID (1 << 2)
1340#define ATTR_SIZE (1 << 3)
1341#define ATTR_ATIME (1 << 4)
1342#define ATTR_MTIME (1 << 5)
1343#define ATTR_CTIME (1 << 6)
1344#define ATTR_MASK 127
1345#define ATTR_ATIME_SET (1 << 7)
1346#define ATTR_MTIME_SET (1 << 8)
1347
1348static void v9fs_setattr_post_truncate(V9fsState *s, V9fsSetattrState *vs,
1349 int err)
1350{
1351 if (err == -1) {
1352 err = -errno;
1353 goto out;
1354 }
1355 err = vs->offset;
1356
1357out:
1358 complete_pdu(s, vs->pdu, err);
1359 qemu_free(vs);
1360}
1361
1362static void v9fs_setattr_post_chown(V9fsState *s, V9fsSetattrState *vs, int err)
1363{
1364 if (err == -1) {
1365 err = -errno;
1366 goto out;
1367 }
1368
1369 if (vs->v9iattr.valid & (ATTR_SIZE)) {
1370 err = v9fs_do_truncate(s, &vs->fidp->path, vs->v9iattr.size);
1371 }
1372 v9fs_setattr_post_truncate(s, vs, err);
1373 return;
1374
1375out:
1376 complete_pdu(s, vs->pdu, err);
1377 qemu_free(vs);
1378}
1379
1380static void v9fs_setattr_post_utimensat(V9fsState *s, V9fsSetattrState *vs,
1381 int err)
1382{
1383 if (err == -1) {
1384 err = -errno;
1385 goto out;
1386 }
1387
1388 /* If the only valid entry in iattr is ctime we can call
1389 * chown(-1,-1) to update the ctime of the file
1390 */
1391 if ((vs->v9iattr.valid & (ATTR_UID | ATTR_GID)) ||
1392 ((vs->v9iattr.valid & ATTR_CTIME)
1393 && !((vs->v9iattr.valid & ATTR_MASK) & ~ATTR_CTIME))) {
1394 if (!(vs->v9iattr.valid & ATTR_UID)) {
1395 vs->v9iattr.uid = -1;
1396 }
1397 if (!(vs->v9iattr.valid & ATTR_GID)) {
1398 vs->v9iattr.gid = -1;
1399 }
1400 err = v9fs_do_chown(s, &vs->fidp->path, vs->v9iattr.uid,
1401 vs->v9iattr.gid);
1402 }
1403 v9fs_setattr_post_chown(s, vs, err);
1404 return;
1405
1406out:
1407 complete_pdu(s, vs->pdu, err);
1408 qemu_free(vs);
1409}
1410
1411static void v9fs_setattr_post_chmod(V9fsState *s, V9fsSetattrState *vs, int err)
1412{
1413 if (err == -1) {
1414 err = -errno;
1415 goto out;
1416 }
1417
1418 if (vs->v9iattr.valid & (ATTR_ATIME | ATTR_MTIME)) {
1419 struct timespec times[2];
1420 if (vs->v9iattr.valid & ATTR_ATIME) {
1421 if (vs->v9iattr.valid & ATTR_ATIME_SET) {
1422 times[0].tv_sec = vs->v9iattr.atime_sec;
1423 times[0].tv_nsec = vs->v9iattr.atime_nsec;
1424 } else {
1425 times[0].tv_nsec = UTIME_NOW;
1426 }
1427 } else {
1428 times[0].tv_nsec = UTIME_OMIT;
1429 }
1430
1431 if (vs->v9iattr.valid & ATTR_MTIME) {
1432 if (vs->v9iattr.valid & ATTR_MTIME_SET) {
1433 times[1].tv_sec = vs->v9iattr.mtime_sec;
1434 times[1].tv_nsec = vs->v9iattr.mtime_nsec;
1435 } else {
1436 times[1].tv_nsec = UTIME_NOW;
1437 }
1438 } else {
1439 times[1].tv_nsec = UTIME_OMIT;
1440 }
1441 err = v9fs_do_utimensat(s, &vs->fidp->path, times);
1442 }
1443 v9fs_setattr_post_utimensat(s, vs, err);
1444 return;
1445
1446out:
1447 complete_pdu(s, vs->pdu, err);
1448 qemu_free(vs);
1449}
1450
1451static void v9fs_setattr(V9fsState *s, V9fsPDU *pdu)
1452{
1453 int32_t fid;
1454 V9fsSetattrState *vs;
1455 int err = 0;
1456
1457 vs = qemu_malloc(sizeof(*vs));
1458 vs->pdu = pdu;
1459 vs->offset = 7;
1460
1461 pdu_unmarshal(pdu, vs->offset, "dI", &fid, &vs->v9iattr);
1462
1463 vs->fidp = lookup_fid(s, fid);
1464 if (vs->fidp == NULL) {
1465 err = -EINVAL;
1466 goto out;
1467 }
1468
1469 if (vs->v9iattr.valid & ATTR_MODE) {
1470 err = v9fs_do_chmod(s, &vs->fidp->path, vs->v9iattr.mode);
1471 }
1472
1473 v9fs_setattr_post_chmod(s, vs, err);
1474 return;
1475
1476out:
1477 complete_pdu(s, vs->pdu, err);
1478 qemu_free(vs);
1479}
1480
ff5e54c9
AL		 1481static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err)
1482{
1483 complete_pdu(s, vs->pdu, err);
1484
1485 if (vs->nwnames) {
1486 for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) {
1487 v9fs_string_free(&vs->wnames[vs->name_idx]);
1488 }
1489
1490 qemu_free(vs->wnames);
1491 qemu_free(vs->qids);
1492 }
1493}
1494
1495static void v9fs_walk_marshal(V9fsWalkState *vs)
1496{
1497 int i;
1498 vs->offset = 7;
1499 vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames);
1500
1501 for (i = 0; i < vs->nwnames; i++) {
1502 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]);
1503 }
1504}
1505
1506static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs,
1507 int err)
1508{
1509 if (err == -1) {
1510 free_fid(s, vs->newfidp->fid);
1511 v9fs_string_free(&vs->path);
1512 err = -ENOENT;
1513 goto out;
1514 }
1515
1516 stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
1517
1518 vs->name_idx++;
1519 if (vs->name_idx < vs->nwnames) {
1520 v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
1521 vs->wnames[vs->name_idx].data);
1522 v9fs_string_copy(&vs->newfidp->path, &vs->path);
1523
1524 err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
1525 v9fs_walk_post_newfid_lstat(s, vs, err);
1526 return;
1527 }
1528
1529 v9fs_string_free(&vs->path);
1530 v9fs_walk_marshal(vs);
1531 err = vs->offset;
1532out:
1533 v9fs_walk_complete(s, vs, err);
1534}
1535
1536static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs,
1537 int err)
1538{
1539 if (err == -1) {
1540 v9fs_string_free(&vs->path);
1541 err = -ENOENT;
1542 goto out;
1543 }
1544
1545 stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
1546 vs->name_idx++;
1547 if (vs->name_idx < vs->nwnames) {
1548
1549 v9fs_string_sprintf(&vs->path, "%s/%s",
1550 vs->fidp->path.data, vs->wnames[vs->name_idx].data);
1551 v9fs_string_copy(&vs->fidp->path, &vs->path);
1552
1553 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1554 v9fs_walk_post_oldfid_lstat(s, vs, err);
1555 return;
1556 }
1557
1558 v9fs_string_free(&vs->path);
1559 v9fs_walk_marshal(vs);
1560 err = vs->offset;
1561out:
1562 v9fs_walk_complete(s, vs, err);
1563}
1564
9f107513
AL		 1565static void v9fs_walk(V9fsState *s, V9fsPDU *pdu)
1566{
ff5e54c9
AL		 1567 int32_t fid, newfid;
1568 V9fsWalkState *vs;
1569 int err = 0;
1570 int i;
1571
1572 vs = qemu_malloc(sizeof(*vs));
1573 vs->pdu = pdu;
1574 vs->wnames = NULL;
1575 vs->qids = NULL;
1576 vs->offset = 7;
1577
1578 vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &fid,
1579 &newfid, &vs->nwnames);
1580
1581 if (vs->nwnames) {
1582 vs->wnames = qemu_mallocz(sizeof(vs->wnames[0]) * vs->nwnames);
1583
1584 vs->qids = qemu_mallocz(sizeof(vs->qids[0]) * vs->nwnames);
1585
1586 for (i = 0; i < vs->nwnames; i++) {
1587 vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s",
1588 &vs->wnames[i]);
1589 }
1590 }
1591
1592 vs->fidp = lookup_fid(s, fid);
1593 if (vs->fidp == NULL) {
1594 err = -ENOENT;
1595 goto out;
1596 }
1597
1598 /* FIXME: is this really valid? */
1599 if (fid == newfid) {
1600
d62dbb51 1601 BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
ff5e54c9
AL		 1602 v9fs_string_init(&vs->path);
1603 vs->name_idx = 0;
1604
1605 if (vs->name_idx < vs->nwnames) {
1606 v9fs_string_sprintf(&vs->path, "%s/%s",
1607 vs->fidp->path.data, vs->wnames[vs->name_idx].data);
1608 v9fs_string_copy(&vs->fidp->path, &vs->path);
1609
1610 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1611 v9fs_walk_post_oldfid_lstat(s, vs, err);
1612 return;
1613 }
1614 } else {
1615 vs->newfidp = alloc_fid(s, newfid);
1616 if (vs->newfidp == NULL) {
1617 err = -EINVAL;
1618 goto out;
1619 }
1620
1621 vs->newfidp->uid = vs->fidp->uid;
1622 v9fs_string_init(&vs->path);
1623 vs->name_idx = 0;
1624 v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path);
1625
1626 if (vs->name_idx < vs->nwnames) {
1627 v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
1628 vs->wnames[vs->name_idx].data);
1629 v9fs_string_copy(&vs->newfidp->path, &vs->path);
1630
1631 err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
1632 v9fs_walk_post_newfid_lstat(s, vs, err);
1633 return;
1634 }
9f107513 1635 }
ff5e54c9
AL		 1636
1637 v9fs_walk_marshal(vs);
1638 err = vs->offset;
1639out:
1640 v9fs_walk_complete(s, vs, err);
9f107513
AL		 1641}
1642
5e94c103
MK		 1643static int32_t get_iounit(V9fsState *s, V9fsString *name)
1644{
1645 struct statfs stbuf;
1646 int32_t iounit = 0;
1647
1648 /*
1649 * iounit should be multiples of f_bsize (host filesystem block size
1650 * and as well as less than (client msize - P9_IOHDRSZ))
1651 */
1652 if (!v9fs_do_statfs(s, name, &stbuf)) {
1653 iounit = stbuf.f_bsize;
1654 iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
1655 }
1656
1657 if (!iounit) {
1658 iounit = s->msize - P9_IOHDRSZ;
1659 }
1660 return iounit;
1661}
1662
a6568fe2
AL		 1663static void v9fs_open_post_opendir(V9fsState *s, V9fsOpenState *vs, int err)
1664{
d62dbb51 1665 if (vs->fidp->fs.dir == NULL) {
a6568fe2
AL		 1666 err = -errno;
1667 goto out;
1668 }
d62dbb51 1669 vs->fidp->fid_type = P9_FID_DIR;
a6568fe2
AL		 1670 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0);
1671 err = vs->offset;
1672out:
1673 complete_pdu(s, vs->pdu, err);
1674 qemu_free(vs);
1675
1676}
1677
5e94c103
MK		 1678static void v9fs_open_post_getiounit(V9fsState *s, V9fsOpenState *vs)
1679{
1680 int err;
1681 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, vs->iounit);
1682 err = vs->offset;
1683 complete_pdu(s, vs->pdu, err);
1684 qemu_free(vs);
1685}
1686
a6568fe2
AL		 1687static void v9fs_open_post_open(V9fsState *s, V9fsOpenState *vs, int err)
1688{
d62dbb51 1689 if (vs->fidp->fs.fd == -1) {
a6568fe2
AL		 1690 err = -errno;
1691 goto out;
1692 }
d62dbb51 1693 vs->fidp->fid_type = P9_FID_FILE;
5e94c103
MK		 1694 vs->iounit = get_iounit(s, &vs->fidp->path);
1695 v9fs_open_post_getiounit(s, vs);
1696 return;
a6568fe2
AL		 1697out:
1698 complete_pdu(s, vs->pdu, err);
1699 qemu_free(vs);
1700}
1701
1702static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err)
1703{
771e9d4c
MK		 1704 int flags;
1705
a6568fe2
AL		 1706 if (err) {
1707 err = -errno;
1708 goto out;
1709 }
1710
1711 stat_to_qid(&vs->stbuf, &vs->qid);
1712
1713 if (S_ISDIR(vs->stbuf.st_mode)) {
d62dbb51 1714 vs->fidp->fs.dir = v9fs_do_opendir(s, &vs->fidp->path);
a6568fe2
AL		 1715 v9fs_open_post_opendir(s, vs, err);
1716 } else {
771e9d4c 1717 if (s->proto_version == V9FS_PROTO_2000L) {
771e9d4c 1718 flags = vs->mode;
630c2689 1719 flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
0f8151cb
VJ		 1720 /* Ignore direct disk access hint until the server supports it. */
1721 flags &= ~O_DIRECT;
771e9d4c
MK		 1722 } else {
1723 flags = omode_to_uflags(vs->mode);
1724 }
d62dbb51 1725 vs->fidp->fs.fd = v9fs_do_open(s, &vs->fidp->path, flags);
a6568fe2
AL		 1726 v9fs_open_post_open(s, vs, err);
1727 }
1728 return;
1729out:
1730 complete_pdu(s, vs->pdu, err);
1731 qemu_free(vs);
9f107513
AL		 1732}
1733
1734static void v9fs_open(V9fsState *s, V9fsPDU *pdu)
a6568fe2
AL		 1735{
1736 int32_t fid;
1737 V9fsOpenState *vs;
1738 ssize_t err = 0;
1739
a6568fe2
AL		 1740 vs = qemu_malloc(sizeof(*vs));
1741 vs->pdu = pdu;
1742 vs->offset = 7;
771e9d4c 1743 vs->mode = 0;
a6568fe2 1744
771e9d4c
MK		 1745 if (s->proto_version == V9FS_PROTO_2000L) {
1746 pdu_unmarshal(vs->pdu, vs->offset, "dd", &fid, &vs->mode);
1747 } else {
1748 pdu_unmarshal(vs->pdu, vs->offset, "db", &fid, &vs->mode);
1749 }
a6568fe2
AL		 1750
1751 vs->fidp = lookup_fid(s, fid);
1752 if (vs->fidp == NULL) {
1753 err = -ENOENT;
1754 goto out;
1755 }
1756
d62dbb51 1757 BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
a6568fe2
AL		 1758
1759 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1760
1761 v9fs_open_post_lstat(s, vs, err);
1762 return;
1763out:
1764 complete_pdu(s, pdu, err);
1765 qemu_free(vs);
1766}
1767
c1568af5
VJ		 1768static void v9fs_post_lcreate(V9fsState *s, V9fsLcreateState *vs, int err)
1769{
1770 if (err == 0) {
1771 v9fs_string_copy(&vs->fidp->path, &vs->fullname);
1772 stat_to_qid(&vs->stbuf, &vs->qid);
1773 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid,
1774 &vs->iounit);
1775 err = vs->offset;
1776 } else {
d62dbb51 1777 vs->fidp->fid_type = P9_FID_NONE;
c1568af5 1778 err = -errno;
ab03b63d
SK		 1779 if (vs->fidp->fs.fd > 0) {
1780 close(vs->fidp->fs.fd);
1781 }
c1568af5
VJ		 1782 }
1783
1784 complete_pdu(s, vs->pdu, err);
1785 v9fs_string_free(&vs->name);
1786 v9fs_string_free(&vs->fullname);
1787 qemu_free(vs);
1788}
1789
1790static void v9fs_lcreate_post_get_iounit(V9fsState *s, V9fsLcreateState *vs,
1791 int err)
1792{
1793 if (err) {
1794 err = -errno;
1795 goto out;
1796 }
1797 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
1798
1799out:
1800 v9fs_post_lcreate(s, vs, err);
1801}
1802
1803static void v9fs_lcreate_post_do_open2(V9fsState *s, V9fsLcreateState *vs,
1804 int err)
1805{
d62dbb51 1806 if (vs->fidp->fs.fd == -1) {
c1568af5
VJ		 1807 err = -errno;
1808 goto out;
1809 }
d62dbb51 1810 vs->fidp->fid_type = P9_FID_FILE;
c1568af5
VJ		 1811 vs->iounit = get_iounit(s, &vs->fullname);
1812 v9fs_lcreate_post_get_iounit(s, vs, err);
1813 return;
1814
1815out:
1816 v9fs_post_lcreate(s, vs, err);
1817}
1818
1819static void v9fs_lcreate(V9fsState *s, V9fsPDU *pdu)
1820{
1821 int32_t dfid, flags, mode;
1822 gid_t gid;
1823 V9fsLcreateState *vs;
1824 ssize_t err = 0;
1825
1826 vs = qemu_malloc(sizeof(*vs));
1827 vs->pdu = pdu;
1828 vs->offset = 7;
1829
1830 v9fs_string_init(&vs->fullname);
1831
1832 pdu_unmarshal(vs->pdu, vs->offset, "dsddd", &dfid, &vs->name, &flags,
1833 &mode, &gid);
1834
1835 vs->fidp = lookup_fid(s, dfid);
1836 if (vs->fidp == NULL) {
1837 err = -ENOENT;
1838 goto out;
1839 }
1840
1841 v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
1842 vs->name.data);
1843
0f8151cb
VJ		 1844 /* Ignore direct disk access hint until the server supports it. */
1845 flags &= ~O_DIRECT;
1846
d62dbb51 1847 vs->fidp->fs.fd = v9fs_do_open2(s, vs->fullname.data, vs->fidp->uid,
c1568af5
VJ		 1848 gid, flags, mode);
1849 v9fs_lcreate_post_do_open2(s, vs, err);
1850 return;
1851
1852out:
1853 complete_pdu(s, vs->pdu, err);
1854 v9fs_string_free(&vs->name);
1855 qemu_free(vs);
1856}
1857
b41e95d3
VJ		 1858static void v9fs_post_do_fsync(V9fsState *s, V9fsPDU *pdu, int err)
1859{
1860 if (err == -1) {
1861 err = -errno;
1862 }
1863 complete_pdu(s, pdu, err);
1864}
1865
1866static void v9fs_fsync(V9fsState *s, V9fsPDU *pdu)
1867{
1868 int32_t fid;
1869 size_t offset = 7;
1870 V9fsFidState *fidp;
49594973 1871 int datasync;
b41e95d3
VJ		 1872 int err;
1873
49594973 1874 pdu_unmarshal(pdu, offset, "dd", &fid, &datasync);
b41e95d3
VJ		 1875 fidp = lookup_fid(s, fid);
1876 if (fidp == NULL) {
1877 err = -ENOENT;
1878 v9fs_post_do_fsync(s, pdu, err);
1879 return;
1880 }
49594973 1881 err = v9fs_do_fsync(s, fidp->fs.fd, datasync);
b41e95d3
VJ		 1882 v9fs_post_do_fsync(s, pdu, err);
1883}
1884
a6568fe2
AL		 1885static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu)
1886{
bbd5697b
AL		 1887 int32_t fid;
1888 size_t offset = 7;
1889 int err;
1890
1891 pdu_unmarshal(pdu, offset, "d", &fid);
1892
1893 err = free_fid(s, fid);
1894 if (err < 0) {
1895 goto out;
a6568fe2 1896 }
bbd5697b
AL		 1897
1898 offset = 7;
1899 err = offset;
1900out:
1901 complete_pdu(s, pdu, err);
9f107513
AL		 1902}
1903
a9231555
AL		 1904static void v9fs_read_post_readdir(V9fsState *, V9fsReadState *, ssize_t);
1905
1906static void v9fs_read_post_seekdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1907{
1908 if (err) {
1909 goto out;
1910 }
1911 v9fs_stat_free(&vs->v9stat);
1912 v9fs_string_free(&vs->name);
1913 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
1914 vs->offset += vs->count;
1915 err = vs->offset;
1916out:
1917 complete_pdu(s, vs->pdu, err);
1918 qemu_free(vs);
1919 return;
1920}
1921
1922static void v9fs_read_post_dir_lstat(V9fsState *s, V9fsReadState *vs,
1923 ssize_t err)
1924{
1925 if (err) {
1926 err = -errno;
1927 goto out;
1928 }
1929 err = stat_to_v9stat(s, &vs->name, &vs->stbuf, &vs->v9stat);
1930 if (err) {
1931 goto out;
1932 }
1933
1934 vs->len = pdu_marshal(vs->pdu, vs->offset + 4 + vs->count, "S",
1935 &vs->v9stat);
1936 if ((vs->len != (vs->v9stat.size + 2)) ||
1937 ((vs->count + vs->len) > vs->max_count)) {
d62dbb51 1938 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->dir_pos);
a9231555
AL		 1939 v9fs_read_post_seekdir(s, vs, err);
1940 return;
1941 }
1942 vs->count += vs->len;
1943 v9fs_stat_free(&vs->v9stat);
1944 v9fs_string_free(&vs->name);
1945 vs->dir_pos = vs->dent->d_off;
d62dbb51 1946 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
a9231555
AL		 1947 v9fs_read_post_readdir(s, vs, err);
1948 return;
1949out:
d62dbb51 1950 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->dir_pos);
a9231555
AL		 1951 v9fs_read_post_seekdir(s, vs, err);
1952 return;
1953
1954}
1955
1956static void v9fs_read_post_readdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1957{
1958 if (vs->dent) {
1959 memset(&vs->v9stat, 0, sizeof(vs->v9stat));
1960 v9fs_string_init(&vs->name);
1961 v9fs_string_sprintf(&vs->name, "%s/%s", vs->fidp->path.data,
1962 vs->dent->d_name);
1963 err = v9fs_do_lstat(s, &vs->name, &vs->stbuf);
1964 v9fs_read_post_dir_lstat(s, vs, err);
1965 return;
1966 }
1967
1968 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
1969 vs->offset += vs->count;
1970 err = vs->offset;
1971 complete_pdu(s, vs->pdu, err);
1972 qemu_free(vs);
1973 return;
1974}
1975
1976static void v9fs_read_post_telldir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1977{
d62dbb51 1978 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
a9231555
AL		 1979 v9fs_read_post_readdir(s, vs, err);
1980 return;
1981}
1982
1983static void v9fs_read_post_rewinddir(V9fsState *s, V9fsReadState *vs,
1984 ssize_t err)
1985{
d62dbb51 1986 vs->dir_pos = v9fs_do_telldir(s, vs->fidp->fs.dir);
a9231555
AL		 1987 v9fs_read_post_telldir(s, vs, err);
1988 return;
1989}
1990
56d15a53 1991static void v9fs_read_post_preadv(V9fsState *s, V9fsReadState *vs, ssize_t err)
a9231555
AL		 1992{
1993 if (err < 0) {
1994 /* IO error return the error */
1995 err = -errno;
1996 goto out;
1997 }
1998 vs->total += vs->len;
1999 vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
2000 if (vs->total < vs->count && vs->len > 0) {
2001 do {
2002 if (0) {
2003 print_sg(vs->sg, vs->cnt);
2004 }
56d15a53
SG		 2005 vs->len = v9fs_do_preadv(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2006 vs->off);
2007 if (vs->len > 0) {
2008 vs->off += vs->len;
2009 }
a9231555
AL		 2010 } while (vs->len == -1 && errno == EINTR);
2011 if (vs->len == -1) {
2012 err = -errno;
2013 }
56d15a53 2014 v9fs_read_post_preadv(s, vs, err);
a9231555
AL		 2015 return;
2016 }
2017 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
2018 vs->offset += vs->count;
2019 err = vs->offset;
2020
2021out:
2022 complete_pdu(s, vs->pdu, err);
2023 qemu_free(vs);
2024}
2025
fa32ef88
AK		 2026static void v9fs_xattr_read(V9fsState *s, V9fsReadState *vs)
2027{
2028 ssize_t err = 0;
2029 int read_count;
2030 int64_t xattr_len;
2031
2032 xattr_len = vs->fidp->fs.xattr.len;
2033 read_count = xattr_len - vs->off;
2034 if (read_count > vs->count) {
2035 read_count = vs->count;
2036 } else if (read_count < 0) {
2037 /*
2038 * read beyond XATTR value
2039 */
2040 read_count = 0;
2041 }
2042 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", read_count);
2043 vs->offset += pdu_pack(vs->pdu, vs->offset,
2044 ((char *)vs->fidp->fs.xattr.value) + vs->off,
2045 read_count);
2046 err = vs->offset;
2047 complete_pdu(s, vs->pdu, err);
2048 qemu_free(vs);
2049}
2050
9f107513
AL		 2051static void v9fs_read(V9fsState *s, V9fsPDU *pdu)
2052{
a9231555
AL		 2053 int32_t fid;
2054 V9fsReadState *vs;
2055 ssize_t err = 0;
2056
2057 vs = qemu_malloc(sizeof(*vs));
2058 vs->pdu = pdu;
2059 vs->offset = 7;
2060 vs->total = 0;
2061 vs->len = 0;
2062 vs->count = 0;
2063
2064 pdu_unmarshal(vs->pdu, vs->offset, "dqd", &fid, &vs->off, &vs->count);
2065
2066 vs->fidp = lookup_fid(s, fid);
2067 if (vs->fidp == NULL) {
2068 err = -EINVAL;
2069 goto out;
2070 }
2071
fa32ef88 2072 if (vs->fidp->fid_type == P9_FID_DIR) {
a9231555
AL		 2073 vs->max_count = vs->count;
2074 vs->count = 0;
2075 if (vs->off == 0) {
d62dbb51 2076 v9fs_do_rewinddir(s, vs->fidp->fs.dir);
a9231555
AL		 2077 }
2078 v9fs_read_post_rewinddir(s, vs, err);
2079 return;
fa32ef88 2080 } else if (vs->fidp->fid_type == P9_FID_FILE) {
a9231555
AL		 2081 vs->sg = vs->iov;
2082 pdu_marshal(vs->pdu, vs->offset + 4, "v", vs->sg, &vs->cnt);
56d15a53
SG		 2083 vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
2084 if (vs->total <= vs->count) {
2085 vs->len = v9fs_do_preadv(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2086 vs->off);
2087 if (vs->len > 0) {
2088 vs->off += vs->len;
2089 }
2090 err = vs->len;
2091 v9fs_read_post_preadv(s, vs, err);
2092 }
a9231555 2093 return;
fa32ef88
AK		 2094 } else if (vs->fidp->fid_type == P9_FID_XATTR) {
2095 v9fs_xattr_read(s, vs);
2096 return;
a9231555
AL		 2097 } else {
2098 err = -EINVAL;
9f107513 2099 }
a9231555
AL		 2100out:
2101 complete_pdu(s, pdu, err);
2102 qemu_free(vs);
9f107513
AL		 2103}
2104
c18e2f94
SK		 2105typedef struct V9fsReadDirState {
2106 V9fsPDU *pdu;
2107 V9fsFidState *fidp;
2108 V9fsQID qid;
2109 off_t saved_dir_pos;
2110 struct dirent *dent;
2111 int32_t count;
2112 int32_t max_count;
2113 size_t offset;
2114 int64_t initial_offset;
2115 V9fsString name;
2116} V9fsReadDirState;
2117
2118static void v9fs_readdir_post_seekdir(V9fsState *s, V9fsReadDirState *vs)
2119{
2120 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
2121 vs->offset += vs->count;
2122 complete_pdu(s, vs->pdu, vs->offset);
2123 qemu_free(vs);
2124 return;
2125}
2126
2127/* Size of each dirent on the wire: size of qid (13) + size of offset (8)
2128 * size of type (1) + size of name.size (2) + strlen(name.data)
2129 */
2130#define V9_READDIR_DATA_SZ (24 + strlen(vs->name.data))
2131
2132static void v9fs_readdir_post_readdir(V9fsState *s, V9fsReadDirState *vs)
2133{
2134 int len;
2135 size_t size;
2136
2137 if (vs->dent) {
2138 v9fs_string_init(&vs->name);
2139 v9fs_string_sprintf(&vs->name, "%s", vs->dent->d_name);
2140
2141 if ((vs->count + V9_READDIR_DATA_SZ) > vs->max_count) {
2142 /* Ran out of buffer. Set dir back to old position and return */
d62dbb51 2143 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->saved_dir_pos);
c18e2f94
SK		 2144 v9fs_readdir_post_seekdir(s, vs);
2145 return;
2146 }
2147
2148 /* Fill up just the path field of qid because the client uses
2149 * only that. To fill the entire qid structure we will have
2150 * to stat each dirent found, which is expensive
2151 */
2152 size = MIN(sizeof(vs->dent->d_ino), sizeof(vs->qid.path));
2153 memcpy(&vs->qid.path, &vs->dent->d_ino, size);
2154 /* Fill the other fields with dummy values */
2155 vs->qid.type = 0;
2156 vs->qid.version = 0;
2157
2158 len = pdu_marshal(vs->pdu, vs->offset+4+vs->count, "Qqbs",
2159 &vs->qid, vs->dent->d_off,
2160 vs->dent->d_type, &vs->name);
2161 vs->count += len;
2162 v9fs_string_free(&vs->name);
2163 vs->saved_dir_pos = vs->dent->d_off;
d62dbb51 2164 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
c18e2f94
SK		 2165 v9fs_readdir_post_readdir(s, vs);
2166 return;
2167 }
2168
2169 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
2170 vs->offset += vs->count;
2171 complete_pdu(s, vs->pdu, vs->offset);
2172 qemu_free(vs);
2173 return;
2174}
2175
2176static void v9fs_readdir_post_telldir(V9fsState *s, V9fsReadDirState *vs)
2177{
d62dbb51 2178 vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
c18e2f94
SK		 2179 v9fs_readdir_post_readdir(s, vs);
2180 return;
2181}
2182
2183static void v9fs_readdir_post_setdir(V9fsState *s, V9fsReadDirState *vs)
2184{
d62dbb51 2185 vs->saved_dir_pos = v9fs_do_telldir(s, vs->fidp->fs.dir);
c18e2f94
SK		 2186 v9fs_readdir_post_telldir(s, vs);
2187 return;
2188}
2189
2190static void v9fs_readdir(V9fsState *s, V9fsPDU *pdu)
2191{
2192 int32_t fid;
2193 V9fsReadDirState *vs;
2194 ssize_t err = 0;
2195 size_t offset = 7;
2196
2197 vs = qemu_malloc(sizeof(*vs));
2198 vs->pdu = pdu;
2199 vs->offset = 7;
2200 vs->count = 0;
2201
2202 pdu_unmarshal(vs->pdu, offset, "dqd", &fid, &vs->initial_offset,
2203 &vs->max_count);
2204
2205 vs->fidp = lookup_fid(s, fid);
d62dbb51 2206 if (vs->fidp == NULL || !(vs->fidp->fs.dir)) {
c18e2f94
SK		 2207 err = -EINVAL;
2208 goto out;
2209 }
2210
2211 if (vs->initial_offset == 0) {
d62dbb51 2212 v9fs_do_rewinddir(s, vs->fidp->fs.dir);
c18e2f94 2213 } else {
d62dbb51 2214 v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->initial_offset);
c18e2f94
SK		 2215 }
2216
2217 v9fs_readdir_post_setdir(s, vs);
2218 return;
2219
2220out:
2221 complete_pdu(s, pdu, err);
2222 qemu_free(vs);
2223 return;
2224}
2225
56d15a53 2226static void v9fs_write_post_pwritev(V9fsState *s, V9fsWriteState *vs,
8449360c
AL		 2227 ssize_t err)
2228{
2229 if (err < 0) {
2230 /* IO error return the error */
2231 err = -errno;
2232 goto out;
2233 }
2234 vs->total += vs->len;
2235 vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
2236 if (vs->total < vs->count && vs->len > 0) {
2237 do {
2238 if (0) {
2239 print_sg(vs->sg, vs->cnt);
2240 }
56d15a53
SG		 2241 vs->len = v9fs_do_pwritev(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2242 vs->off);
2243 if (vs->len > 0) {
2244 vs->off += vs->len;
2245 }
8449360c
AL		 2246 } while (vs->len == -1 && errno == EINTR);
2247 if (vs->len == -1) {
2248 err = -errno;
2249 }
56d15a53 2250 v9fs_write_post_pwritev(s, vs, err);
8449360c
AL		 2251 return;
2252 }
2253 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
8449360c
AL		 2254 err = vs->offset;
2255out:
2256 complete_pdu(s, vs->pdu, err);
2257 qemu_free(vs);
2258}
2259
10b468bd
AK		 2260static void v9fs_xattr_write(V9fsState *s, V9fsWriteState *vs)
2261{
2262 int i, to_copy;
2263 ssize_t err = 0;
2264 int write_count;
2265 int64_t xattr_len;
2266
2267 xattr_len = vs->fidp->fs.xattr.len;
2268 write_count = xattr_len - vs->off;
2269 if (write_count > vs->count) {
2270 write_count = vs->count;
2271 } else if (write_count < 0) {
2272 /*
2273 * write beyond XATTR value len specified in
2274 * xattrcreate
2275 */
2276 err = -ENOSPC;
2277 goto out;
2278 }
2279 vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", write_count);
2280 err = vs->offset;
2281 vs->fidp->fs.xattr.copied_len += write_count;
2282 /*
2283 * Now copy the content from sg list
2284 */
2285 for (i = 0; i < vs->cnt; i++) {
2286 if (write_count > vs->sg[i].iov_len) {
2287 to_copy = vs->sg[i].iov_len;
2288 } else {
2289 to_copy = write_count;
2290 }
2291 memcpy((char *)vs->fidp->fs.xattr.value + vs->off,
2292 vs->sg[i].iov_base, to_copy);
2293 /* updating vs->off since we are not using below */
2294 vs->off += to_copy;
2295 write_count -= to_copy;
2296 }
2297out:
2298 complete_pdu(s, vs->pdu, err);
2299 qemu_free(vs);
2300}
2301
9f107513
AL		 2302static void v9fs_write(V9fsState *s, V9fsPDU *pdu)
2303{
8449360c
AL		 2304 int32_t fid;
2305 V9fsWriteState *vs;
2306 ssize_t err;
2307
2308 vs = qemu_malloc(sizeof(*vs));
2309
2310 vs->pdu = pdu;
2311 vs->offset = 7;
2312 vs->sg = vs->iov;
2313 vs->total = 0;
2314 vs->len = 0;
2315
2316 pdu_unmarshal(vs->pdu, vs->offset, "dqdv", &fid, &vs->off, &vs->count,
10b468bd 2317 vs->sg, &vs->cnt);
8449360c
AL		 2318
2319 vs->fidp = lookup_fid(s, fid);
2320 if (vs->fidp == NULL) {
2321 err = -EINVAL;
2322 goto out;
9f107513 2323 }
8449360c 2324
10b468bd
AK		 2325 if (vs->fidp->fid_type == P9_FID_FILE) {
2326 if (vs->fidp->fs.fd == -1) {
2327 err = -EINVAL;
2328 goto out;
2329 }
2330 } else if (vs->fidp->fid_type == P9_FID_XATTR) {
2331 /*
2332 * setxattr operation
2333 */
2334 v9fs_xattr_write(s, vs);
2335 return;
2336 } else {
8449360c
AL		 2337 err = -EINVAL;
2338 goto out;
2339 }
56d15a53
SG		 2340 vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
2341 if (vs->total <= vs->count) {
2342 vs->len = v9fs_do_pwritev(s, vs->fidp->fs.fd, vs->sg, vs->cnt, vs->off);
2343 if (vs->len > 0) {
2344 vs->off += vs->len;
2345 }
2346 err = vs->len;
2347 v9fs_write_post_pwritev(s, vs, err);
2348 }
8449360c 2349 return;
8449360c
AL		 2350out:
2351 complete_pdu(s, vs->pdu, err);
2352 qemu_free(vs);
9f107513
AL		 2353}
2354
5e94c103 2355static void v9fs_create_post_getiounit(V9fsState *s, V9fsCreateState *vs)
c494dd6f 2356{
5e94c103
MK		 2357 int err;
2358 v9fs_string_copy(&vs->fidp->path, &vs->fullname);
2359 stat_to_qid(&vs->stbuf, &vs->qid);
c494dd6f 2360
5e94c103
MK		 2361 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, vs->iounit);
2362 err = vs->offset;
c494dd6f 2363
5e94c103
MK		 2364 complete_pdu(s, vs->pdu, err);
2365 v9fs_string_free(&vs->name);
2366 v9fs_string_free(&vs->extension);
2367 v9fs_string_free(&vs->fullname);
2368 qemu_free(vs);
2369}
2370
2371static void v9fs_post_create(V9fsState *s, V9fsCreateState *vs, int err)
2372{
2373 if (err == 0) {
2374 vs->iounit = get_iounit(s, &vs->fidp->path);
2375 v9fs_create_post_getiounit(s, vs);
2376 return;
c494dd6f
AL		 2377 }
2378
2379 complete_pdu(s, vs->pdu, err);
2380 v9fs_string_free(&vs->name);
2381 v9fs_string_free(&vs->extension);
2382 v9fs_string_free(&vs->fullname);
2383 qemu_free(vs);
2384}
2385
2386static void v9fs_create_post_perms(V9fsState *s, V9fsCreateState *vs, int err)
2387{
2388 if (err) {
2389 err = -errno;
2390 }
2391 v9fs_post_create(s, vs, err);
2392}
2393
2394static void v9fs_create_post_opendir(V9fsState *s, V9fsCreateState *vs,
2395 int err)
2396{
d62dbb51 2397 if (!vs->fidp->fs.dir) {
c494dd6f
AL		 2398 err = -errno;
2399 }
d62dbb51 2400 vs->fidp->fid_type = P9_FID_DIR;
c494dd6f
AL		 2401 v9fs_post_create(s, vs, err);
2402}
2403
2404static void v9fs_create_post_dir_lstat(V9fsState *s, V9fsCreateState *vs,
2405 int err)
2406{
2407 if (err) {
2408 err = -errno;
2409 goto out;
2410 }
2411
d62dbb51 2412 vs->fidp->fs.dir = v9fs_do_opendir(s, &vs->fullname);
c494dd6f
AL		 2413 v9fs_create_post_opendir(s, vs, err);
2414 return;
2415
2416out:
2417 v9fs_post_create(s, vs, err);
2418}
2419
2420static void v9fs_create_post_mkdir(V9fsState *s, V9fsCreateState *vs, int err)
2421{
2422 if (err) {
2423 err = -errno;
2424 goto out;
2425 }
2426
2427 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2428 v9fs_create_post_dir_lstat(s, vs, err);
2429 return;
2430
2431out:
2432 v9fs_post_create(s, vs, err);
2433}
2434
c494dd6f
AL		 2435static void v9fs_create_post_fstat(V9fsState *s, V9fsCreateState *vs, int err)
2436{
2437 if (err) {
d62dbb51
AK		 2438 vs->fidp->fid_type = P9_FID_NONE;
2439 close(vs->fidp->fs.fd);
c494dd6f
AL		 2440 err = -errno;
2441 }
c494dd6f
AL		 2442 v9fs_post_create(s, vs, err);
2443 return;
2444}
2445
2446static void v9fs_create_post_open2(V9fsState *s, V9fsCreateState *vs, int err)
2447{
d62dbb51 2448 if (vs->fidp->fs.fd == -1) {
c494dd6f
AL		 2449 err = -errno;
2450 goto out;
2451 }
d62dbb51
AK		 2452 vs->fidp->fid_type = P9_FID_FILE;
2453 err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
c494dd6f
AL		 2454 v9fs_create_post_fstat(s, vs, err);
2455
2456 return;
2457
2458out:
2459 v9fs_post_create(s, vs, err);
2460
2461}
2462
2463static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
2464{
2465
2466 if (err == 0 || errno != ENOENT) {
2467 err = -errno;
2468 goto out;
2469 }
2470
2471 if (vs->perm & P9_STAT_MODE_DIR) {
b67592ea
MK		 2472 err = v9fs_do_mkdir(s, vs->fullname.data, vs->perm & 0777,
2473 vs->fidp->uid, -1);
c494dd6f
AL		 2474 v9fs_create_post_mkdir(s, vs, err);
2475 } else if (vs->perm & P9_STAT_MODE_SYMLINK) {
08c60fc9
VJ		 2476 err = v9fs_do_symlink(s, vs->fidp, vs->extension.data,
2477 vs->fullname.data, -1);
c494dd6f
AL		 2478 v9fs_create_post_perms(s, vs, err);
2479 } else if (vs->perm & P9_STAT_MODE_LINK) {
2480 int32_t nfid = atoi(vs->extension.data);
2481 V9fsFidState *nfidp = lookup_fid(s, nfid);
2482 if (nfidp == NULL) {
2483 err = -errno;
2484 v9fs_post_create(s, vs, err);
2485 }
2486 err = v9fs_do_link(s, &nfidp->path, &vs->fullname);
2487 v9fs_create_post_perms(s, vs, err);
2488 } else if (vs->perm & P9_STAT_MODE_DEVICE) {
2489 char ctype;
2490 uint32_t major, minor;
2491 mode_t nmode = 0;
2492
2493 if (sscanf(vs->extension.data, "%c %u %u", &ctype, &major,
2494 &minor) != 3) {
2495 err = -errno;
2496 v9fs_post_create(s, vs, err);
2497 }
2498
2499 switch (ctype) {
2500 case 'c':
2501 nmode = S_IFCHR;
2502 break;
2503 case 'b':
2504 nmode = S_IFBLK;
2505 break;
2506 default:
2507 err = -EIO;
2508 v9fs_post_create(s, vs, err);
2509 }
2510
2511 nmode |= vs->perm & 0777;
5268cecc
MK		 2512 err = v9fs_do_mknod(s, vs->fullname.data, nmode,
2513 makedev(major, minor), vs->fidp->uid, -1);
c494dd6f
AL		 2514 v9fs_create_post_perms(s, vs, err);
2515 } else if (vs->perm & P9_STAT_MODE_NAMED_PIPE) {
5268cecc
MK		 2516 err = v9fs_do_mknod(s, vs->fullname.data, S_IFIFO | (vs->perm & 0777),
2517 0, vs->fidp->uid, -1);
c494dd6f
AL		 2518 v9fs_post_create(s, vs, err);
2519 } else if (vs->perm & P9_STAT_MODE_SOCKET) {
5268cecc
MK		 2520 err = v9fs_do_mknod(s, vs->fullname.data, S_IFSOCK | (vs->perm & 0777),
2521 0, vs->fidp->uid, -1);
63729c36 2522 v9fs_post_create(s, vs, err);
c494dd6f 2523 } else {
d62dbb51 2524 vs->fidp->fs.fd = v9fs_do_open2(s, vs->fullname.data, vs->fidp->uid,
c1568af5
VJ		 2525 -1, omode_to_uflags(vs->mode)|O_CREAT, vs->perm);
2526
c494dd6f
AL		 2527 v9fs_create_post_open2(s, vs, err);
2528 }
2529
2530 return;
2531
2532out:
2533 v9fs_post_create(s, vs, err);
2534}
2535
9f107513
AL		 2536static void v9fs_create(V9fsState *s, V9fsPDU *pdu)
2537{
c494dd6f
AL		 2538 int32_t fid;
2539 V9fsCreateState *vs;
2540 int err = 0;
2541
2542 vs = qemu_malloc(sizeof(*vs));
2543 vs->pdu = pdu;
2544 vs->offset = 7;
2545
2546 v9fs_string_init(&vs->fullname);
2547
2548 pdu_unmarshal(vs->pdu, vs->offset, "dsdbs", &fid, &vs->name,
2549 &vs->perm, &vs->mode, &vs->extension);
2550
2551 vs->fidp = lookup_fid(s, fid);
2552 if (vs->fidp == NULL) {
2553 err = -EINVAL;
2554 goto out;
9f107513 2555 }
c494dd6f
AL		 2556
2557 v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
2558 vs->name.data);
2559
2560 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2561 v9fs_create_post_lstat(s, vs, err);
2562 return;
2563
2564out:
2565 complete_pdu(s, vs->pdu, err);
2566 v9fs_string_free(&vs->name);
2567 v9fs_string_free(&vs->extension);
2568 qemu_free(vs);
9f107513
AL		 2569}
2570
08c60fc9
VJ		 2571static void v9fs_post_symlink(V9fsState *s, V9fsSymlinkState *vs, int err)
2572{
2573 if (err == 0) {
2574 stat_to_qid(&vs->stbuf, &vs->qid);
2575 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
2576 err = vs->offset;
2577 } else {
2578 err = -errno;
2579 }
2580 complete_pdu(s, vs->pdu, err);
2581 v9fs_string_free(&vs->name);
2582 v9fs_string_free(&vs->symname);
2583 v9fs_string_free(&vs->fullname);
2584 qemu_free(vs);
2585}
2586
2587static void v9fs_symlink_post_do_symlink(V9fsState *s, V9fsSymlinkState *vs,
2588 int err)
2589{
2590 if (err) {
2591 goto out;
2592 }
2593 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2594out:
2595 v9fs_post_symlink(s, vs, err);
2596}
2597
2598static void v9fs_symlink(V9fsState *s, V9fsPDU *pdu)
2599{
2600 int32_t dfid;
2601 V9fsSymlinkState *vs;
2602 int err = 0;
2603 gid_t gid;
2604
2605 vs = qemu_malloc(sizeof(*vs));
2606 vs->pdu = pdu;
2607 vs->offset = 7;
2608
2609 v9fs_string_init(&vs->fullname);
2610
2611 pdu_unmarshal(vs->pdu, vs->offset, "dssd", &dfid, &vs->name,
2612 &vs->symname, &gid);
2613
2614 vs->dfidp = lookup_fid(s, dfid);
2615 if (vs->dfidp == NULL) {
2616 err = -EINVAL;
2617 goto out;
2618 }
2619
2620 v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->dfidp->path.data,
2621 vs->name.data);
2622 err = v9fs_do_symlink(s, vs->dfidp, vs->symname.data,
2623 vs->fullname.data, gid);
2624 v9fs_symlink_post_do_symlink(s, vs, err);
2625 return;
2626
2627out:
2628 complete_pdu(s, vs->pdu, err);
2629 v9fs_string_free(&vs->name);
2630 v9fs_string_free(&vs->symname);
2631 qemu_free(vs);
2632}
2633
9f107513
AL		 2634static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)
2635{
9c5e9d89
AL		 2636 /* A nop call with no return */
2637 complete_pdu(s, pdu, 7);
9f107513
AL		 2638}
2639
b2c224be
VJ		 2640static void v9fs_link(V9fsState *s, V9fsPDU *pdu)
2641{
2642 int32_t dfid, oldfid;
2643 V9fsFidState *dfidp, *oldfidp;
2644 V9fsString name, fullname;
2645 size_t offset = 7;
2646 int err = 0;
2647
2648 v9fs_string_init(&fullname);
2649
2650 pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name);
2651
2652 dfidp = lookup_fid(s, dfid);
2653 if (dfidp == NULL) {
2654 err = -errno;
2655 goto out;
2656 }
2657
2658 oldfidp = lookup_fid(s, oldfid);
2659 if (oldfidp == NULL) {
2660 err = -errno;
2661 goto out;
2662 }
2663
2664 v9fs_string_sprintf(&fullname, "%s/%s", dfidp->path.data, name.data);
2665 err = offset;
2666 err = v9fs_do_link(s, &oldfidp->path, &fullname);
2667 if (err) {
2668 err = -errno;
2669 }
2670 v9fs_string_free(&fullname);
2671
2672out:
2673 v9fs_string_free(&name);
2674 complete_pdu(s, pdu, err);
2675}
2676
5bae1900
AL		 2677static void v9fs_remove_post_remove(V9fsState *s, V9fsRemoveState *vs,
2678 int err)
2679{
5bae1900 2680 if (err < 0) {
926487b7
SK		 2681 err = -errno;
2682 } else {
2683 err = vs->offset;
5bae1900
AL		 2684 }
2685
926487b7
SK		 2686 /* For TREMOVE we need to clunk the fid even on failed remove */
2687 free_fid(s, vs->fidp->fid);
2688
5bae1900
AL		 2689 complete_pdu(s, vs->pdu, err);
2690 qemu_free(vs);
2691}
2692
9f107513
AL		 2693static void v9fs_remove(V9fsState *s, V9fsPDU *pdu)
2694{
5bae1900
AL		 2695 int32_t fid;
2696 V9fsRemoveState *vs;
2697 int err = 0;
2698
2699 vs = qemu_malloc(sizeof(*vs));
2700 vs->pdu = pdu;
2701 vs->offset = 7;
2702
2703 pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
2704
2705 vs->fidp = lookup_fid(s, fid);
2706 if (vs->fidp == NULL) {
2707 err = -EINVAL;
2708 goto out;
9f107513 2709 }
5bae1900
AL		 2710
2711 err = v9fs_do_remove(s, &vs->fidp->path);
2712 v9fs_remove_post_remove(s, vs, err);
2713 return;
2714
2715out:
2716 complete_pdu(s, pdu, err);
2717 qemu_free(vs);
9f107513
AL		 2718}
2719
8cf89e00
AL		 2720static void v9fs_wstat_post_truncate(V9fsState *s, V9fsWstatState *vs, int err)
2721{
2722 if (err < 0) {
2723 goto out;
2724 }
2725
2726 err = vs->offset;
2727
2728out:
2729 v9fs_stat_free(&vs->v9stat);
2730 complete_pdu(s, vs->pdu, err);
2731 qemu_free(vs);
2732}
2733
2734static void v9fs_wstat_post_rename(V9fsState *s, V9fsWstatState *vs, int err)
2735{
2736 if (err < 0) {
2737 goto out;
2738 }
8cf89e00
AL		 2739 if (vs->v9stat.length != -1) {
2740 if (v9fs_do_truncate(s, &vs->fidp->path, vs->v9stat.length) < 0) {
2741 err = -errno;
2742 }
2743 }
2744 v9fs_wstat_post_truncate(s, vs, err);
2745 return;
2746
2747out:
2748 v9fs_stat_free(&vs->v9stat);
2749 complete_pdu(s, vs->pdu, err);
2750 qemu_free(vs);
2751}
2752
c7b4b0b3 2753static int v9fs_complete_rename(V9fsState *s, V9fsRenameState *vs)
8cf89e00 2754{
c7b4b0b3
MK		 2755 int err = 0;
2756 char *old_name, *new_name;
2757 char *end;
8cf89e00 2758
c7b4b0b3
MK		 2759 if (vs->newdirfid != -1) {
2760 V9fsFidState *dirfidp;
2761 dirfidp = lookup_fid(s, vs->newdirfid);
2762
2763 if (dirfidp == NULL) {
2764 err = -ENOENT;
2765 goto out;
2766 }
2767
d62dbb51 2768 BUG_ON(dirfidp->fid_type != P9_FID_NONE);
8cf89e00 2769
c7b4b0b3
MK		 2770 new_name = qemu_mallocz(dirfidp->path.size + vs->name.size + 2);
2771
2772 strcpy(new_name, dirfidp->path.data);
2773 strcat(new_name, "/");
2774 strcat(new_name + dirfidp->path.size, vs->name.data);
2775 } else {
8cf89e00
AL		 2776 old_name = vs->fidp->path.data;
2777 end = strrchr(old_name, '/');
2778 if (end) {
2779 end++;
2780 } else {
2781 end = old_name;
2782 }
c7b4b0b3 2783 new_name = qemu_mallocz(end - old_name + vs->name.size + 1);
8cf89e00 2784
c7b4b0b3
MK		 2785 strncat(new_name, old_name, end - old_name);
2786 strncat(new_name + (end - old_name), vs->name.data, vs->name.size);
2787 }
8cf89e00 2788
c7b4b0b3
MK		 2789 v9fs_string_free(&vs->name);
2790 vs->name.data = qemu_strdup(new_name);
2791 vs->name.size = strlen(new_name);
8cf89e00 2792
c7b4b0b3
MK		 2793 if (strcmp(new_name, vs->fidp->path.data) != 0) {
2794 if (v9fs_do_rename(s, &vs->fidp->path, &vs->name)) {
2795 err = -errno;
2796 } else {
2797 V9fsFidState *fidp;
2798 /*
2799 * Fixup fid's pointing to the old name to
2800 * start pointing to the new name
2801 */
2802 for (fidp = s->fid_list; fidp; fidp = fidp->next) {
2803 if (vs->fidp == fidp) {
2804 /*
2805 * we replace name of this fid towards the end
2806 * so that our below strcmp will work
2807 */
2808 continue;
2809 }
2810 if (!strncmp(vs->fidp->path.data, fidp->path.data,
2811 strlen(vs->fidp->path.data))) {
2812 /* replace the name */
2813 v9fs_fix_path(&fidp->path, &vs->name,
2814 strlen(vs->fidp->path.data));
8cf89e00 2815 }
8cf89e00 2816 }
c7b4b0b3 2817 v9fs_string_copy(&vs->fidp->path, &vs->name);
8cf89e00
AL		 2818 }
2819 }
c7b4b0b3
MK		 2820out:
2821 v9fs_string_free(&vs->name);
2822 return err;
2823}
2824
2825static void v9fs_rename_post_rename(V9fsState *s, V9fsRenameState *vs, int err)
2826{
2827 complete_pdu(s, vs->pdu, err);
2828 qemu_free(vs);
2829}
2830
2831static void v9fs_wstat_post_chown(V9fsState *s, V9fsWstatState *vs, int err)
2832{
2833 if (err < 0) {
2834 goto out;
2835 }
2836
2837 if (vs->v9stat.name.size != 0) {
2838 V9fsRenameState *vr;
2839
783f04e1 2840 vr = qemu_mallocz(sizeof(V9fsRenameState));
c7b4b0b3
MK		 2841 vr->newdirfid = -1;
2842 vr->pdu = vs->pdu;
2843 vr->fidp = vs->fidp;
2844 vr->offset = vs->offset;
2845 vr->name.size = vs->v9stat.name.size;
2846 vr->name.data = qemu_strdup(vs->v9stat.name.data);
2847
2848 err = v9fs_complete_rename(s, vr);
2849 qemu_free(vr);
2850 }
8cf89e00
AL		 2851 v9fs_wstat_post_rename(s, vs, err);
2852 return;
2853
2854out:
2855 v9fs_stat_free(&vs->v9stat);
2856 complete_pdu(s, vs->pdu, err);
2857 qemu_free(vs);
2858}
2859
c7b4b0b3
MK		 2860static void v9fs_rename(V9fsState *s, V9fsPDU *pdu)
2861{
2862 int32_t fid;
2863 V9fsRenameState *vs;
2864 ssize_t err = 0;
2865
2866 vs = qemu_malloc(sizeof(*vs));
2867 vs->pdu = pdu;
2868 vs->offset = 7;
2869
2870 pdu_unmarshal(vs->pdu, vs->offset, "dds", &fid, &vs->newdirfid, &vs->name);
2871
2872 vs->fidp = lookup_fid(s, fid);
2873 if (vs->fidp == NULL) {
2874 err = -ENOENT;
2875 goto out;
2876 }
2877
d62dbb51 2878 BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
c7b4b0b3
MK		 2879
2880 err = v9fs_complete_rename(s, vs);
2881 v9fs_rename_post_rename(s, vs, err);
2882 return;
2883out:
2884 complete_pdu(s, vs->pdu, err);
2885 qemu_free(vs);
2886}
2887
8cf89e00
AL		 2888static void v9fs_wstat_post_utime(V9fsState *s, V9fsWstatState *vs, int err)
2889{
2890 if (err < 0) {
2891 goto out;
2892 }
2893
f7613bee 2894 if (vs->v9stat.n_gid != -1 || vs->v9stat.n_uid != -1) {
8cf89e00
AL		 2895 if (v9fs_do_chown(s, &vs->fidp->path, vs->v9stat.n_uid,
2896 vs->v9stat.n_gid)) {
2897 err = -errno;
2898 }
2899 }
2900 v9fs_wstat_post_chown(s, vs, err);
2901 return;
2902
2903out:
2904 v9fs_stat_free(&vs->v9stat);
2905 complete_pdu(s, vs->pdu, err);
2906 qemu_free(vs);
2907}
2908
2909static void v9fs_wstat_post_chmod(V9fsState *s, V9fsWstatState *vs, int err)
2910{
2911 if (err < 0) {
2912 goto out;
2913 }
2914
74bc02b2 2915 if (vs->v9stat.mtime != -1 || vs->v9stat.atime != -1) {
8fc39ae4
SK		 2916 struct timespec times[2];
2917 if (vs->v9stat.atime != -1) {
2918 times[0].tv_sec = vs->v9stat.atime;
2919 times[0].tv_nsec = 0;
2920 } else {
2921 times[0].tv_nsec = UTIME_OMIT;
2922 }
2923 if (vs->v9stat.mtime != -1) {
2924 times[1].tv_sec = vs->v9stat.mtime;
2925 times[1].tv_nsec = 0;
2926 } else {
2927 times[1].tv_nsec = UTIME_OMIT;
2928 }
2929
2930 if (v9fs_do_utimensat(s, &vs->fidp->path, times)) {
8cf89e00
AL		 2931 err = -errno;
2932 }
2933 }
2934
2935 v9fs_wstat_post_utime(s, vs, err);
2936 return;
2937
2938out:
2939 v9fs_stat_free(&vs->v9stat);
2940 complete_pdu(s, vs->pdu, err);
2941 qemu_free(vs);
2942}
2943
2944static void v9fs_wstat_post_fsync(V9fsState *s, V9fsWstatState *vs, int err)
2945{
2946 if (err == -1) {
2947 err = -errno;
2948 }
2949 v9fs_stat_free(&vs->v9stat);
2950 complete_pdu(s, vs->pdu, err);
2951 qemu_free(vs);
2952}
2953
2954static void v9fs_wstat_post_lstat(V9fsState *s, V9fsWstatState *vs, int err)
2955{
2956 uint32_t v9_mode;
2957
2958 if (err == -1) {
2959 err = -errno;
2960 goto out;
2961 }
2962
2963 v9_mode = stat_to_v9mode(&vs->stbuf);
2964
2965 if ((vs->v9stat.mode & P9_STAT_MODE_TYPE_BITS) !=
2966 (v9_mode & P9_STAT_MODE_TYPE_BITS)) {
2967 /* Attempting to change the type */
2968 err = -EIO;
2969 goto out;
2970 }
2971
2972 if (v9fs_do_chmod(s, &vs->fidp->path, v9mode_to_mode(vs->v9stat.mode,
2973 &vs->v9stat.extension))) {
2974 err = -errno;
2975 }
2976 v9fs_wstat_post_chmod(s, vs, err);
2977 return;
2978
2979out:
2980 v9fs_stat_free(&vs->v9stat);
2981 complete_pdu(s, vs->pdu, err);
2982 qemu_free(vs);
2983}
2984
9f107513
AL		 2985static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu)
2986{
8cf89e00
AL		 2987 int32_t fid;
2988 V9fsWstatState *vs;
2989 int err = 0;
2990
2991 vs = qemu_malloc(sizeof(*vs));
2992 vs->pdu = pdu;
2993 vs->offset = 7;
2994
2995 pdu_unmarshal(pdu, vs->offset, "dwS", &fid, &vs->unused, &vs->v9stat);
2996
2997 vs->fidp = lookup_fid(s, fid);
2998 if (vs->fidp == NULL) {
2999 err = -EINVAL;
3000 goto out;
9f107513 3001 }
8cf89e00
AL		 3002
3003 /* do we need to sync the file? */
3004 if (donttouch_stat(&vs->v9stat)) {
49594973 3005 err = v9fs_do_fsync(s, vs->fidp->fs.fd, 0);
8cf89e00
AL		 3006 v9fs_wstat_post_fsync(s, vs, err);
3007 return;
3008 }
3009
3010 if (vs->v9stat.mode != -1) {
3011 err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
3012 v9fs_wstat_post_lstat(s, vs, err);
3013 return;
3014 }
3015
3016 v9fs_wstat_post_chmod(s, vs, err);
3017 return;
3018
3019out:
3020 v9fs_stat_free(&vs->v9stat);
3021 complete_pdu(s, vs->pdu, err);
3022 qemu_free(vs);
9f107513
AL		 3023}
3024
be940c87
MK		 3025static void v9fs_statfs_post_statfs(V9fsState *s, V9fsStatfsState *vs, int err)
3026{
5e94c103
MK		 3027 int32_t bsize_factor;
3028
be940c87
MK		 3029 if (err) {
3030 err = -errno;
3031 goto out;
3032 }
3033
5e94c103
MK		 3034 /*
3035 * compute bsize factor based on host file system block size
3036 * and client msize
3037 */
3038 bsize_factor = (s->msize - P9_IOHDRSZ)/vs->stbuf.f_bsize;
3039 if (!bsize_factor) {
3040 bsize_factor = 1;
3041 }
be940c87
MK		 3042 vs->v9statfs.f_type = vs->stbuf.f_type;
3043 vs->v9statfs.f_bsize = vs->stbuf.f_bsize;
5e94c103
MK		 3044 vs->v9statfs.f_bsize *= bsize_factor;
3045 /*
3046 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
3047 * adjust(divide) the number of blocks, free blocks and available
3048 * blocks by bsize factor
3049 */
3050 vs->v9statfs.f_blocks = vs->stbuf.f_blocks/bsize_factor;
3051 vs->v9statfs.f_bfree = vs->stbuf.f_bfree/bsize_factor;
3052 vs->v9statfs.f_bavail = vs->stbuf.f_bavail/bsize_factor;
be940c87
MK		 3053 vs->v9statfs.f_files = vs->stbuf.f_files;
3054 vs->v9statfs.f_ffree = vs->stbuf.f_ffree;
3055 vs->v9statfs.fsid_val = (unsigned int) vs->stbuf.f_fsid.__val[0] |
3056 (unsigned long long)vs->stbuf.f_fsid.__val[1] << 32;
3057 vs->v9statfs.f_namelen = vs->stbuf.f_namelen;
3058
3059 vs->offset += pdu_marshal(vs->pdu, vs->offset, "ddqqqqqqd",
3060 vs->v9statfs.f_type, vs->v9statfs.f_bsize, vs->v9statfs.f_blocks,
3061 vs->v9statfs.f_bfree, vs->v9statfs.f_bavail, vs->v9statfs.f_files,
3062 vs->v9statfs.f_ffree, vs->v9statfs.fsid_val,
3063 vs->v9statfs.f_namelen);
3064
3065out:
3066 complete_pdu(s, vs->pdu, vs->offset);
3067 qemu_free(vs);
3068}
3069
3070static void v9fs_statfs(V9fsState *s, V9fsPDU *pdu)
3071{
3072 V9fsStatfsState *vs;
3073 ssize_t err = 0;
3074
3075 vs = qemu_malloc(sizeof(*vs));
3076 vs->pdu = pdu;
3077 vs->offset = 7;
3078
3079 memset(&vs->v9statfs, 0, sizeof(vs->v9statfs));
3080
3081 pdu_unmarshal(vs->pdu, vs->offset, "d", &vs->fid);
3082
3083 vs->fidp = lookup_fid(s, vs->fid);
3084 if (vs->fidp == NULL) {
3085 err = -ENOENT;
3086 goto out;
3087 }
3088
3089 err = v9fs_do_statfs(s, &vs->fidp->path, &vs->stbuf);
3090 v9fs_statfs_post_statfs(s, vs, err);
3091 return;
3092
3093out:
3094 complete_pdu(s, vs->pdu, err);
3095 qemu_free(vs);
3096}
3097
5268cecc
MK		 3098static void v9fs_mknod_post_lstat(V9fsState *s, V9fsMkState *vs, int err)
3099{
3100 if (err == -1) {
3101 err = -errno;
3102 goto out;
3103 }
3104
3105 stat_to_qid(&vs->stbuf, &vs->qid);
3106 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
3107 err = vs->offset;
3108out:
3109 complete_pdu(s, vs->pdu, err);
3110 v9fs_string_free(&vs->fullname);
3111 v9fs_string_free(&vs->name);
3112 qemu_free(vs);
3113}
3114
3115static void v9fs_mknod_post_mknod(V9fsState *s, V9fsMkState *vs, int err)
3116{
3117 if (err == -1) {
3118 err = -errno;
3119 goto out;
3120 }
3121
3122 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
3123 v9fs_mknod_post_lstat(s, vs, err);
3124 return;
3125out:
3126 complete_pdu(s, vs->pdu, err);
3127 v9fs_string_free(&vs->fullname);
3128 v9fs_string_free(&vs->name);
3129 qemu_free(vs);
3130}
3131
3132static void v9fs_mknod(V9fsState *s, V9fsPDU *pdu)
3133{
3134 int32_t fid;
3135 V9fsMkState *vs;
3136 int err = 0;
3137 V9fsFidState *fidp;
3138 gid_t gid;
3139 int mode;
3140 int major, minor;
3141
3142 vs = qemu_malloc(sizeof(*vs));
3143 vs->pdu = pdu;
3144 vs->offset = 7;
3145
3146 v9fs_string_init(&vs->fullname);
3147 pdu_unmarshal(vs->pdu, vs->offset, "dsdddd", &fid, &vs->name, &mode,
3148 &major, &minor, &gid);
3149
3150 fidp = lookup_fid(s, fid);
3151 if (fidp == NULL) {
3152 err = -ENOENT;
3153 goto out;
3154 }
3155
3156 v9fs_string_sprintf(&vs->fullname, "%s/%s", fidp->path.data, vs->name.data);
3157 err = v9fs_do_mknod(s, vs->fullname.data, mode, makedev(major, minor),
3158 fidp->uid, gid);
3159 v9fs_mknod_post_mknod(s, vs, err);
3160 return;
3161
3162out:
3163 complete_pdu(s, vs->pdu, err);
3164 v9fs_string_free(&vs->fullname);
3165 v9fs_string_free(&vs->name);
3166 qemu_free(vs);
3167}
3168
82cc3ee8
MK		 3169/*
3170 * Implement posix byte range locking code
3171 * Server side handling of locking code is very simple, because 9p server in
3172 * QEMU can handle only one client. And most of the lock handling
3173 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
3174 * do any thing in * qemu 9p server side lock code path.
3175 * So when a TLOCK request comes, always return success
3176 */
3177
3178static void v9fs_lock(V9fsState *s, V9fsPDU *pdu)
3179{
3180 int32_t fid, err = 0;
3181 V9fsLockState *vs;
3182
3183 vs = qemu_mallocz(sizeof(*vs));
3184 vs->pdu = pdu;
3185 vs->offset = 7;
3186
3187 vs->flock = qemu_malloc(sizeof(*vs->flock));
3188 pdu_unmarshal(vs->pdu, vs->offset, "dbdqqds", &fid, &vs->flock->type,
3189 &vs->flock->flags, &vs->flock->start, &vs->flock->length,
3190 &vs->flock->proc_id, &vs->flock->client_id);
3191
3192 vs->status = P9_LOCK_ERROR;
3193
3194 /* We support only block flag now (that too ignored currently) */
3195 if (vs->flock->flags & ~P9_LOCK_FLAGS_BLOCK) {
3196 err = -EINVAL;
3197 goto out;
3198 }
3199 vs->fidp = lookup_fid(s, fid);
3200 if (vs->fidp == NULL) {
3201 err = -ENOENT;
3202 goto out;
3203 }
3204
3205 err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
3206 if (err < 0) {
3207 err = -errno;
3208 goto out;
3209 }
3210 vs->status = P9_LOCK_SUCCESS;
3211out:
3212 vs->offset += pdu_marshal(vs->pdu, vs->offset, "b", vs->status);
3213 complete_pdu(s, vs->pdu, err);
3214 qemu_free(vs->flock);
3215 qemu_free(vs);
3216}
3217
8f354003
MK		 3218/*
3219 * When a TGETLOCK request comes, always return success because all lock
3220 * handling is done by client's VFS layer.
3221 */
3222
3223static void v9fs_getlock(V9fsState *s, V9fsPDU *pdu)
3224{
3225 int32_t fid, err = 0;
3226 V9fsGetlockState *vs;
3227
3228 vs = qemu_mallocz(sizeof(*vs));
3229 vs->pdu = pdu;
3230 vs->offset = 7;
3231
3232 vs->glock = qemu_malloc(sizeof(*vs->glock));
3233 pdu_unmarshal(vs->pdu, vs->offset, "dbqqds", &fid, &vs->glock->type,
3234 &vs->glock->start, &vs->glock->length, &vs->glock->proc_id,
3235 &vs->glock->client_id);
3236
3237 vs->fidp = lookup_fid(s, fid);
3238 if (vs->fidp == NULL) {
3239 err = -ENOENT;
3240 goto out;
3241 }
3242
3243 err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
3244 if (err < 0) {
3245 err = -errno;
3246 goto out;
3247 }
3248 vs->glock->type = F_UNLCK;
3249 vs->offset += pdu_marshal(vs->pdu, vs->offset, "bqqds", vs->glock->type,
3250 vs->glock->start, vs->glock->length, vs->glock->proc_id,
3251 &vs->glock->client_id);
3252out:
3253 complete_pdu(s, vs->pdu, err);
3254 qemu_free(vs->glock);
3255 qemu_free(vs);
3256}
3257
b67592ea
MK		 3258static void v9fs_mkdir_post_lstat(V9fsState *s, V9fsMkState *vs, int err)
3259{
3260 if (err == -1) {
3261 err = -errno;
3262 goto out;
3263 }
3264
3265 stat_to_qid(&vs->stbuf, &vs->qid);
3266 vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
3267 err = vs->offset;
3268out:
3269 complete_pdu(s, vs->pdu, err);
3270 v9fs_string_free(&vs->fullname);
3271 v9fs_string_free(&vs->name);
3272 qemu_free(vs);
3273}
3274
3275static void v9fs_mkdir_post_mkdir(V9fsState *s, V9fsMkState *vs, int err)
3276{
3277 if (err == -1) {
3278 err = -errno;
3279 goto out;
3280 }
3281
3282 err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
3283 v9fs_mkdir_post_lstat(s, vs, err);
3284 return;
3285out:
3286 complete_pdu(s, vs->pdu, err);
3287 v9fs_string_free(&vs->fullname);
3288 v9fs_string_free(&vs->name);
3289 qemu_free(vs);
3290}
3291
3292static void v9fs_mkdir(V9fsState *s, V9fsPDU *pdu)
3293{
3294 int32_t fid;
3295 V9fsMkState *vs;
3296 int err = 0;
3297 V9fsFidState *fidp;
3298 gid_t gid;
3299 int mode;
3300
3301 vs = qemu_malloc(sizeof(*vs));
3302 vs->pdu = pdu;
3303 vs->offset = 7;
3304
3305 v9fs_string_init(&vs->fullname);
3306 pdu_unmarshal(vs->pdu, vs->offset, "dsdd", &fid, &vs->name, &mode,
3307 &gid);
3308
3309 fidp = lookup_fid(s, fid);
3310 if (fidp == NULL) {
3311 err = -ENOENT;
3312 goto out;
3313 }
3314
3315 v9fs_string_sprintf(&vs->fullname, "%s/%s", fidp->path.data, vs->name.data);
3316 err = v9fs_do_mkdir(s, vs->fullname.data, mode, fidp->uid, gid);
3317 v9fs_mkdir_post_mkdir(s, vs, err);
3318 return;
3319
3320out:
3321 complete_pdu(s, vs->pdu, err);
3322 v9fs_string_free(&vs->fullname);
3323 v9fs_string_free(&vs->name);
3324 qemu_free(vs);
3325}
3326
fa32ef88
AK		 3327static void v9fs_post_xattr_getvalue(V9fsState *s, V9fsXattrState *vs, int err)
3328{
3329
3330 if (err < 0) {
3331 err = -errno;
3332 free_fid(s, vs->xattr_fidp->fid);
3333 goto out;
3334 }
3335 vs->offset += pdu_marshal(vs->pdu, vs->offset, "q", vs->size);
3336 err = vs->offset;
3337out:
3338 complete_pdu(s, vs->pdu, err);
3339 v9fs_string_free(&vs->name);
3340 qemu_free(vs);
3341 return;
3342}
3343
3344static void v9fs_post_xattr_check(V9fsState *s, V9fsXattrState *vs, ssize_t err)
3345{
3346 if (err < 0) {
3347 err = -errno;
3348 free_fid(s, vs->xattr_fidp->fid);
3349 goto out;
3350 }
3351 /*
3352 * Read the xattr value
3353 */
3354 vs->xattr_fidp->fs.xattr.len = vs->size;
3355 vs->xattr_fidp->fid_type = P9_FID_XATTR;
3356 vs->xattr_fidp->fs.xattr.copied_len = -1;
3357 if (vs->size) {
3358 vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3359 err = v9fs_do_lgetxattr(s, &vs->xattr_fidp->path,
3360 &vs->name, vs->xattr_fidp->fs.xattr.value,
3361 vs->xattr_fidp->fs.xattr.len);
3362 }
3363 v9fs_post_xattr_getvalue(s, vs, err);
3364 return;
3365out:
3366 complete_pdu(s, vs->pdu, err);
3367 v9fs_string_free(&vs->name);
3368 qemu_free(vs);
3369}
3370
3371static void v9fs_post_lxattr_getvalue(V9fsState *s,
3372 V9fsXattrState *vs, int err)
3373{
3374 if (err < 0) {
3375 err = -errno;
3376 free_fid(s, vs->xattr_fidp->fid);
3377 goto out;
3378 }
3379 vs->offset += pdu_marshal(vs->pdu, vs->offset, "q", vs->size);
3380 err = vs->offset;
3381out:
3382 complete_pdu(s, vs->pdu, err);
3383 v9fs_string_free(&vs->name);
3384 qemu_free(vs);
3385 return;
3386}
3387
3388static void v9fs_post_lxattr_check(V9fsState *s,
3389 V9fsXattrState *vs, ssize_t err)
3390{
3391 if (err < 0) {
3392 err = -errno;
3393 free_fid(s, vs->xattr_fidp->fid);
3394 goto out;
3395 }
3396 /*
3397 * Read the xattr value
3398 */
3399 vs->xattr_fidp->fs.xattr.len = vs->size;
3400 vs->xattr_fidp->fid_type = P9_FID_XATTR;
3401 vs->xattr_fidp->fs.xattr.copied_len = -1;
3402 if (vs->size) {
3403 vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3404 err = v9fs_do_llistxattr(s, &vs->xattr_fidp->path,
3405 vs->xattr_fidp->fs.xattr.value,
3406 vs->xattr_fidp->fs.xattr.len);
3407 }
3408 v9fs_post_lxattr_getvalue(s, vs, err);
3409 return;
3410out:
3411 complete_pdu(s, vs->pdu, err);
3412 v9fs_string_free(&vs->name);
3413 qemu_free(vs);
3414}
3415
3416static void v9fs_xattrwalk(V9fsState *s, V9fsPDU *pdu)
3417{
3418 ssize_t err = 0;
3419 V9fsXattrState *vs;
3420 int32_t fid, newfid;
3421
3422 vs = qemu_malloc(sizeof(*vs));
3423 vs->pdu = pdu;
3424 vs->offset = 7;
3425
3426 pdu_unmarshal(vs->pdu, vs->offset, "dds", &fid, &newfid, &vs->name);
3427 vs->file_fidp = lookup_fid(s, fid);
3428 if (vs->file_fidp == NULL) {
3429 err = -ENOENT;
3430 goto out;
3431 }
3432
3433 vs->xattr_fidp = alloc_fid(s, newfid);
3434 if (vs->xattr_fidp == NULL) {
3435 err = -EINVAL;
3436 goto out;
3437 }
3438
3439 v9fs_string_copy(&vs->xattr_fidp->path, &vs->file_fidp->path);
3440 if (vs->name.data[0] == 0) {
3441 /*
3442 * listxattr request. Get the size first
3443 */
3444 vs->size = v9fs_do_llistxattr(s, &vs->xattr_fidp->path,
3445 NULL, 0);
3446 if (vs->size < 0) {
3447 err = vs->size;
3448 }
3449 v9fs_post_lxattr_check(s, vs, err);
3450 return;
3451 } else {
3452 /*
3453 * specific xattr fid. We check for xattr
3454 * presence also collect the xattr size
3455 */
3456 vs->size = v9fs_do_lgetxattr(s, &vs->xattr_fidp->path,
3457 &vs->name, NULL, 0);
3458 if (vs->size < 0) {
3459 err = vs->size;
3460 }
3461 v9fs_post_xattr_check(s, vs, err);
3462 return;
3463 }
3464out:
3465 complete_pdu(s, vs->pdu, err);
3466 v9fs_string_free(&vs->name);
3467 qemu_free(vs);
3468}
3469
10b468bd
AK		 3470static void v9fs_xattrcreate(V9fsState *s, V9fsPDU *pdu)
3471{
3472 int flags;
3473 int32_t fid;
3474 ssize_t err = 0;
3475 V9fsXattrState *vs;
3476
3477 vs = qemu_malloc(sizeof(*vs));
3478 vs->pdu = pdu;
3479 vs->offset = 7;
3480
3481 pdu_unmarshal(vs->pdu, vs->offset, "dsqd",
3482 &fid, &vs->name, &vs->size, &flags);
3483
3484 vs->file_fidp = lookup_fid(s, fid);
3485 if (vs->file_fidp == NULL) {
3486 err = -EINVAL;
3487 goto out;
3488 }
3489
3490 /* Make the file fid point to xattr */
3491 vs->xattr_fidp = vs->file_fidp;
3492 vs->xattr_fidp->fid_type = P9_FID_XATTR;
3493 vs->xattr_fidp->fs.xattr.copied_len = 0;
3494 vs->xattr_fidp->fs.xattr.len = vs->size;
3495 vs->xattr_fidp->fs.xattr.flags = flags;
3496 v9fs_string_init(&vs->xattr_fidp->fs.xattr.name);
3497 v9fs_string_copy(&vs->xattr_fidp->fs.xattr.name, &vs->name);
9ed3ef26
AK		 3498 if (vs->size)
3499 vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3500 else
3501 vs->xattr_fidp->fs.xattr.value = NULL;
10b468bd
AK		 3502
3503out:
3504 complete_pdu(s, vs->pdu, err);
3505 v9fs_string_free(&vs->name);
3506 qemu_free(vs);
3507}
fa32ef88 3508
df0973a4
MK		 3509static void v9fs_readlink_post_readlink(V9fsState *s, V9fsReadLinkState *vs,
3510 int err)
3511{
3512 if (err < 0) {
3513 err = -errno;
3514 goto out;
3515 }
3516 vs->offset += pdu_marshal(vs->pdu, vs->offset, "s", &vs->target);
3517 err = vs->offset;
3518out:
3519 complete_pdu(s, vs->pdu, err);
3520 v9fs_string_free(&vs->target);
3521 qemu_free(vs);
3522}
3523
3524static void v9fs_readlink(V9fsState *s, V9fsPDU *pdu)
3525{
3526 int32_t fid;
3527 V9fsReadLinkState *vs;
3528 int err = 0;
3529 V9fsFidState *fidp;
3530
3531 vs = qemu_malloc(sizeof(*vs));
3532 vs->pdu = pdu;
3533 vs->offset = 7;
3534
3535 pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
3536
3537 fidp = lookup_fid(s, fid);
3538 if (fidp == NULL) {
3539 err = -ENOENT;
3540 goto out;
3541 }
3542
3543 v9fs_string_init(&vs->target);
3544 err = v9fs_do_readlink(s, &fidp->path, &vs->target);
3545 v9fs_readlink_post_readlink(s, vs, err);
3546 return;
3547out:
3548 complete_pdu(s, vs->pdu, err);
3549 qemu_free(vs);
3550}
3551
9f107513
AL		 3552typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu);
3553
3554static pdu_handler_t *pdu_handlers[] = {
c18e2f94 3555 [P9_TREADDIR] = v9fs_readdir,
be940c87 3556 [P9_TSTATFS] = v9fs_statfs,
00ede4c2 3557 [P9_TGETATTR] = v9fs_getattr,
c79ce737 3558 [P9_TSETATTR] = v9fs_setattr,
fa32ef88 3559 [P9_TXATTRWALK] = v9fs_xattrwalk,
10b468bd 3560 [P9_TXATTRCREATE] = v9fs_xattrcreate,
5268cecc 3561 [P9_TMKNOD] = v9fs_mknod,
c7b4b0b3 3562 [P9_TRENAME] = v9fs_rename,
82cc3ee8 3563 [P9_TLOCK] = v9fs_lock,
8f354003 3564 [P9_TGETLOCK] = v9fs_getlock,
df0973a4 3565 [P9_TREADLINK] = v9fs_readlink,
b67592ea 3566 [P9_TMKDIR] = v9fs_mkdir,
9f107513 3567 [P9_TVERSION] = v9fs_version,
771e9d4c 3568 [P9_TLOPEN] = v9fs_open,
9f107513
AL		 3569 [P9_TATTACH] = v9fs_attach,
3570 [P9_TSTAT] = v9fs_stat,
3571 [P9_TWALK] = v9fs_walk,
3572 [P9_TCLUNK] = v9fs_clunk,
b41e95d3 3573 [P9_TFSYNC] = v9fs_fsync,
9f107513
AL		 3574 [P9_TOPEN] = v9fs_open,
3575 [P9_TREAD] = v9fs_read,
3576#if 0
3577 [P9_TAUTH] = v9fs_auth,
3578#endif
3579 [P9_TFLUSH] = v9fs_flush,
b2c224be 3580 [P9_TLINK] = v9fs_link,
08c60fc9 3581 [P9_TSYMLINK] = v9fs_symlink,
9f107513 3582 [P9_TCREATE] = v9fs_create,
c1568af5 3583 [P9_TLCREATE] = v9fs_lcreate,
9f107513
AL		 3584 [P9_TWRITE] = v9fs_write,
3585 [P9_TWSTAT] = v9fs_wstat,
3586 [P9_TREMOVE] = v9fs_remove,
3587};
3588
3589static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
3590{
3591 pdu_handler_t *handler;
3592
3593 if (debug_9p_pdu) {
3594 pprint_pdu(pdu);
3595 }
3596
3597 BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers));
3598
3599 handler = pdu_handlers[pdu->id];
3600 BUG_ON(handler == NULL);
3601
3602 handler(s, pdu);
3603}
3604
3605static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
3606{
3607 V9fsState *s = (V9fsState *)vdev;
3608 V9fsPDU *pdu;
3609 ssize_t len;
3610
3611 while ((pdu = alloc_pdu(s)) &&
3612 (len = virtqueue_pop(vq, &pdu->elem)) != 0) {
3613 uint8_t *ptr;
3614
3615 BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0);
3616 BUG_ON(pdu->elem.out_sg[0].iov_len < 7);
3617
3618 ptr = pdu->elem.out_sg[0].iov_base;
3619
3620 memcpy(&pdu->size, ptr, 4);
3621 pdu->id = ptr[4];
3622 memcpy(&pdu->tag, ptr + 5, 2);
3623
3624 submit_pdu(s, pdu);
3625 }
3626
3627 free_pdu(s, pdu);
3628}
3629
3630static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
3631{
3632 features |= 1 << VIRTIO_9P_MOUNT_TAG;
3633 return features;
3634}
3635
3636static V9fsState *to_virtio_9p(VirtIODevice *vdev)
3637{
3638 return (V9fsState *)vdev;
3639}
3640
3641static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
3642{
3643 struct virtio_9p_config *cfg;
3644 V9fsState *s = to_virtio_9p(vdev);
3645
3646 cfg = qemu_mallocz(sizeof(struct virtio_9p_config) +
3647 s->tag_len);
3648 stw_raw(&cfg->tag_len, s->tag_len);
3649 memcpy(cfg->tag, s->tag, s->tag_len);
3650 memcpy(config, cfg, s->config_size);
3651 qemu_free(cfg);
3652}
3653
3654VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
3655 {
3656 V9fsState *s;
3657 int i, len;
3658 struct stat stat;
3659 FsTypeEntry *fse;
3660
3661
3662 s = (V9fsState *)virtio_common_init("virtio-9p",
3663 VIRTIO_ID_9P,
3664 sizeof(struct virtio_9p_config)+
3665 MAX_TAG_LEN,
3666 sizeof(V9fsState));
3667
3668 /* initialize pdu allocator */
3669 QLIST_INIT(&s->free_list);
3670 for (i = 0; i < (MAX_REQ - 1); i++) {
3671 QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next);
3672 }
3673
3674 s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output);
3675
3676 fse = get_fsdev_fsentry(conf->fsdev_id);
3677
3678 if (!fse) {
3679 /* We don't have a fsdev identified by fsdev_id */
9f506893
HPB		 3680 fprintf(stderr, "Virtio-9p device couldn't find fsdev with the "
3681 "id = %s\n", conf->fsdev_id ? conf->fsdev_id : "NULL");
9f107513
AL		 3682 exit(1);
3683 }
3684
3685 if (!fse->path || !conf->tag) {
3686 /* we haven't specified a mount_tag or the path */
3687 fprintf(stderr, "fsdev with id %s needs path "
3688 "and Virtio-9p device needs mount_tag arguments\n",
3689 conf->fsdev_id);
3690 exit(1);
3691 }
3692
758e8e38
VJ		 3693 if (!strcmp(fse->security_model, "passthrough")) {
3694 /* Files on the Fileserver set to client user credentials */
3695 s->ctx.fs_sm = SM_PASSTHROUGH;
fc22118d 3696 s->ctx.xops = passthrough_xattr_ops;
758e8e38
VJ		 3697 } else if (!strcmp(fse->security_model, "mapped")) {
3698 /* Files on the fileserver are set to QEMU credentials.
3699 * Client user credentials are saved in extended attributes.
3700 */
3701 s->ctx.fs_sm = SM_MAPPED;
fc22118d 3702 s->ctx.xops = mapped_xattr_ops;
12848bfc
AK		 3703 } else if (!strcmp(fse->security_model, "none")) {
3704 /*
3705 * Files on the fileserver are set to QEMU credentials.
3706 */
3707 s->ctx.fs_sm = SM_NONE;
fc22118d 3708 s->ctx.xops = none_xattr_ops;
758e8e38 3709 } else {
12848bfc
AK		 3710 fprintf(stderr, "Default to security_model=none. You may want"
3711 " enable advanced security model using "
9ce56db6
VJ		 3712 "security option:\n\t security_model=passthrough \n\t "
3713 "security_model=mapped\n");
12848bfc 3714 s->ctx.fs_sm = SM_NONE;
fc22118d 3715 s->ctx.xops = none_xattr_ops;
9ce56db6
VJ		 3716 }
3717
9f107513
AL		 3718 if (lstat(fse->path, &stat)) {
3719 fprintf(stderr, "share path %s does not exist\n", fse->path);
3720 exit(1);
3721 } else if (!S_ISDIR(stat.st_mode)) {
3722 fprintf(stderr, "share path %s is not a directory \n", fse->path);
3723 exit(1);
3724 }
3725
3726 s->ctx.fs_root = qemu_strdup(fse->path);
3727 len = strlen(conf->tag);
3728 if (len > MAX_TAG_LEN) {
3729 len = MAX_TAG_LEN;
3730 }
3731 /* s->tag is non-NULL terminated string */
3732 s->tag = qemu_malloc(len);
3733 memcpy(s->tag, conf->tag, len);
3734 s->tag_len = len;
3735 s->ctx.uid = -1;
3736
3737 s->ops = fse->ops;
3738 s->vdev.get_features = virtio_9p_get_features;
3739 s->config_size = sizeof(struct virtio_9p_config) +
3740 s->tag_len;
3741 s->vdev.get_config = virtio_9p_get_config;
3742
3743 return &s->vdev;
3744}
Empty description
This page took 0.647181 seconds and 4 git commands to generate.