sm501: Add missing arbitration control register
[qemu.git] / hw / 9pfs / 9p.c
1 /*
2 * Virtio 9p backend
3 *
4 * Copyright IBM, Corp. 2010
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 */
13
14 #include "qemu/osdep.h"
15 #include <glib/gprintf.h>
16 #include "hw/virtio/virtio.h"
17 #include "qapi/error.h"
18 #include "qemu/error-report.h"
19 #include "qemu/iov.h"
20 #include "qemu/sockets.h"
21 #include "virtio-9p.h"
22 #include "fsdev/qemu-fsdev.h"
23 #include "9p-xattr.h"
24 #include "coth.h"
25 #include "trace.h"
26 #include "migration/migration.h"
27
28 int open_fd_hw;
29 int total_open_fd;
30 static int open_fd_rc;
31
32 enum {
33 Oread = 0x00,
34 Owrite = 0x01,
35 Ordwr = 0x02,
36 Oexec = 0x03,
37 Oexcl = 0x04,
38 Otrunc = 0x10,
39 Orexec = 0x20,
40 Orclose = 0x40,
41 Oappend = 0x80,
42 };
43
44 ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
45 {
46 ssize_t ret;
47 va_list ap;
48
49 va_start(ap, fmt);
50 ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap);
51 va_end(ap);
52
53 return ret;
54 }
55
56 ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
57 {
58 ssize_t ret;
59 va_list ap;
60
61 va_start(ap, fmt);
62 ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap);
63 va_end(ap);
64
65 return ret;
66 }
67
68 static void pdu_push_and_notify(V9fsPDU *pdu)
69 {
70 pdu->s->transport->push_and_notify(pdu);
71 }
72
73 static int omode_to_uflags(int8_t mode)
74 {
75 int ret = 0;
76
77 switch (mode & 3) {
78 case Oread:
79 ret = O_RDONLY;
80 break;
81 case Ordwr:
82 ret = O_RDWR;
83 break;
84 case Owrite:
85 ret = O_WRONLY;
86 break;
87 case Oexec:
88 ret = O_RDONLY;
89 break;
90 }
91
92 if (mode & Otrunc) {
93 ret |= O_TRUNC;
94 }
95
96 if (mode & Oappend) {
97 ret |= O_APPEND;
98 }
99
100 if (mode & Oexcl) {
101 ret |= O_EXCL;
102 }
103
104 return ret;
105 }
106
107 struct dotl_openflag_map {
108 int dotl_flag;
109 int open_flag;
110 };
111
112 static int dotl_to_open_flags(int flags)
113 {
114 int i;
115 /*
116 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
117 * and P9_DOTL_NOACCESS
118 */
119 int oflags = flags & O_ACCMODE;
120
121 struct dotl_openflag_map dotl_oflag_map[] = {
122 { P9_DOTL_CREATE, O_CREAT },
123 { P9_DOTL_EXCL, O_EXCL },
124 { P9_DOTL_NOCTTY , O_NOCTTY },
125 { P9_DOTL_TRUNC, O_TRUNC },
126 { P9_DOTL_APPEND, O_APPEND },
127 { P9_DOTL_NONBLOCK, O_NONBLOCK } ,
128 { P9_DOTL_DSYNC, O_DSYNC },
129 { P9_DOTL_FASYNC, FASYNC },
130 { P9_DOTL_DIRECT, O_DIRECT },
131 { P9_DOTL_LARGEFILE, O_LARGEFILE },
132 { P9_DOTL_DIRECTORY, O_DIRECTORY },
133 { P9_DOTL_NOFOLLOW, O_NOFOLLOW },
134 { P9_DOTL_NOATIME, O_NOATIME },
135 { P9_DOTL_SYNC, O_SYNC },
136 };
137
138 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
139 if (flags & dotl_oflag_map[i].dotl_flag) {
140 oflags |= dotl_oflag_map[i].open_flag;
141 }
142 }
143
144 return oflags;
145 }
146
147 void cred_init(FsCred *credp)
148 {
149 credp->fc_uid = -1;
150 credp->fc_gid = -1;
151 credp->fc_mode = -1;
152 credp->fc_rdev = -1;
153 }
154
155 static int get_dotl_openflags(V9fsState *s, int oflags)
156 {
157 int flags;
158 /*
159 * Filter the client open flags
160 */
161 flags = dotl_to_open_flags(oflags);
162 flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
163 /*
164 * Ignore direct disk access hint until the server supports it.
165 */
166 flags &= ~O_DIRECT;
167 return flags;
168 }
169
170 void v9fs_path_init(V9fsPath *path)
171 {
172 path->data = NULL;
173 path->size = 0;
174 }
175
176 void v9fs_path_free(V9fsPath *path)
177 {
178 g_free(path->data);
179 path->data = NULL;
180 path->size = 0;
181 }
182
183
184 void GCC_FMT_ATTR(2, 3)
185 v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...)
186 {
187 va_list ap;
188
189 v9fs_path_free(path);
190
191 va_start(ap, fmt);
192 /* Bump the size for including terminating NULL */
193 path->size = g_vasprintf(&path->data, fmt, ap) + 1;
194 va_end(ap);
195 }
196
197 void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs)
198 {
199 v9fs_path_free(lhs);
200 lhs->data = g_malloc(rhs->size);
201 memcpy(lhs->data, rhs->data, rhs->size);
202 lhs->size = rhs->size;
203 }
204
205 int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
206 const char *name, V9fsPath *path)
207 {
208 int err;
209 err = s->ops->name_to_path(&s->ctx, dirpath, name, path);
210 if (err < 0) {
211 err = -errno;
212 }
213 return err;
214 }
215
216 /*
217 * Return TRUE if s1 is an ancestor of s2.
218 *
219 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
220 * As a special case, We treat s1 as ancestor of s2 if they are same!
221 */
222 static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2)
223 {
224 if (!strncmp(s1->data, s2->data, s1->size - 1)) {
225 if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') {
226 return 1;
227 }
228 }
229 return 0;
230 }
231
232 static size_t v9fs_string_size(V9fsString *str)
233 {
234 return str->size;
235 }
236
237 /*
238 * returns 0 if fid got re-opened, 1 if not, < 0 on error */
239 static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f)
240 {
241 int err = 1;
242 if (f->fid_type == P9_FID_FILE) {
243 if (f->fs.fd == -1) {
244 do {
245 err = v9fs_co_open(pdu, f, f->open_flags);
246 } while (err == -EINTR && !pdu->cancelled);
247 }
248 } else if (f->fid_type == P9_FID_DIR) {
249 if (f->fs.dir.stream == NULL) {
250 do {
251 err = v9fs_co_opendir(pdu, f);
252 } while (err == -EINTR && !pdu->cancelled);
253 }
254 }
255 return err;
256 }
257
258 static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid)
259 {
260 int err;
261 V9fsFidState *f;
262 V9fsState *s = pdu->s;
263
264 for (f = s->fid_list; f; f = f->next) {
265 BUG_ON(f->clunked);
266 if (f->fid == fid) {
267 /*
268 * Update the fid ref upfront so that
269 * we don't get reclaimed when we yield
270 * in open later.
271 */
272 f->ref++;
273 /*
274 * check whether we need to reopen the
275 * file. We might have closed the fd
276 * while trying to free up some file
277 * descriptors.
278 */
279 err = v9fs_reopen_fid(pdu, f);
280 if (err < 0) {
281 f->ref--;
282 return NULL;
283 }
284 /*
285 * Mark the fid as referenced so that the LRU
286 * reclaim won't close the file descriptor
287 */
288 f->flags |= FID_REFERENCED;
289 return f;
290 }
291 }
292 return NULL;
293 }
294
295 static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
296 {
297 V9fsFidState *f;
298
299 for (f = s->fid_list; f; f = f->next) {
300 /* If fid is already there return NULL */
301 BUG_ON(f->clunked);
302 if (f->fid == fid) {
303 return NULL;
304 }
305 }
306 f = g_malloc0(sizeof(V9fsFidState));
307 f->fid = fid;
308 f->fid_type = P9_FID_NONE;
309 f->ref = 1;
310 /*
311 * Mark the fid as referenced so that the LRU
312 * reclaim won't close the file descriptor
313 */
314 f->flags |= FID_REFERENCED;
315 f->next = s->fid_list;
316 s->fid_list = f;
317
318 v9fs_readdir_init(&f->fs.dir);
319 v9fs_readdir_init(&f->fs_reclaim.dir);
320
321 return f;
322 }
323
324 static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp)
325 {
326 int retval = 0;
327
328 if (fidp->fs.xattr.xattrwalk_fid) {
329 /* getxattr/listxattr fid */
330 goto free_value;
331 }
332 /*
333 * if this is fid for setxattr. clunk should
334 * result in setxattr localcall
335 */
336 if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) {
337 /* clunk after partial write */
338 retval = -EINVAL;
339 goto free_out;
340 }
341 if (fidp->fs.xattr.len) {
342 retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name,
343 fidp->fs.xattr.value,
344 fidp->fs.xattr.len,
345 fidp->fs.xattr.flags);
346 } else {
347 retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name);
348 }
349 free_out:
350 v9fs_string_free(&fidp->fs.xattr.name);
351 free_value:
352 g_free(fidp->fs.xattr.value);
353 return retval;
354 }
355
356 static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp)
357 {
358 int retval = 0;
359
360 if (fidp->fid_type == P9_FID_FILE) {
361 /* If we reclaimed the fd no need to close */
362 if (fidp->fs.fd != -1) {
363 retval = v9fs_co_close(pdu, &fidp->fs);
364 }
365 } else if (fidp->fid_type == P9_FID_DIR) {
366 if (fidp->fs.dir.stream != NULL) {
367 retval = v9fs_co_closedir(pdu, &fidp->fs);
368 }
369 } else if (fidp->fid_type == P9_FID_XATTR) {
370 retval = v9fs_xattr_fid_clunk(pdu, fidp);
371 }
372 v9fs_path_free(&fidp->path);
373 g_free(fidp);
374 return retval;
375 }
376
377 static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp)
378 {
379 BUG_ON(!fidp->ref);
380 fidp->ref--;
381 /*
382 * Don't free the fid if it is in reclaim list
383 */
384 if (!fidp->ref && fidp->clunked) {
385 if (fidp->fid == pdu->s->root_fid) {
386 /*
387 * if the clunked fid is root fid then we
388 * have unmounted the fs on the client side.
389 * delete the migration blocker. Ideally, this
390 * should be hooked to transport close notification
391 */
392 if (pdu->s->migration_blocker) {
393 migrate_del_blocker(pdu->s->migration_blocker);
394 error_free(pdu->s->migration_blocker);
395 pdu->s->migration_blocker = NULL;
396 }
397 }
398 return free_fid(pdu, fidp);
399 }
400 return 0;
401 }
402
403 static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid)
404 {
405 V9fsFidState **fidpp, *fidp;
406
407 for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) {
408 if ((*fidpp)->fid == fid) {
409 break;
410 }
411 }
412 if (*fidpp == NULL) {
413 return NULL;
414 }
415 fidp = *fidpp;
416 *fidpp = fidp->next;
417 fidp->clunked = 1;
418 return fidp;
419 }
420
421 void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu)
422 {
423 int reclaim_count = 0;
424 V9fsState *s = pdu->s;
425 V9fsFidState *f, *reclaim_list = NULL;
426
427 for (f = s->fid_list; f; f = f->next) {
428 /*
429 * Unlink fids cannot be reclaimed. Check
430 * for them and skip them. Also skip fids
431 * currently being operated on.
432 */
433 if (f->ref || f->flags & FID_NON_RECLAIMABLE) {
434 continue;
435 }
436 /*
437 * if it is a recently referenced fid
438 * we leave the fid untouched and clear the
439 * reference bit. We come back to it later
440 * in the next iteration. (a simple LRU without
441 * moving list elements around)
442 */
443 if (f->flags & FID_REFERENCED) {
444 f->flags &= ~FID_REFERENCED;
445 continue;
446 }
447 /*
448 * Add fids to reclaim list.
449 */
450 if (f->fid_type == P9_FID_FILE) {
451 if (f->fs.fd != -1) {
452 /*
453 * Up the reference count so that
454 * a clunk request won't free this fid
455 */
456 f->ref++;
457 f->rclm_lst = reclaim_list;
458 reclaim_list = f;
459 f->fs_reclaim.fd = f->fs.fd;
460 f->fs.fd = -1;
461 reclaim_count++;
462 }
463 } else if (f->fid_type == P9_FID_DIR) {
464 if (f->fs.dir.stream != NULL) {
465 /*
466 * Up the reference count so that
467 * a clunk request won't free this fid
468 */
469 f->ref++;
470 f->rclm_lst = reclaim_list;
471 reclaim_list = f;
472 f->fs_reclaim.dir.stream = f->fs.dir.stream;
473 f->fs.dir.stream = NULL;
474 reclaim_count++;
475 }
476 }
477 if (reclaim_count >= open_fd_rc) {
478 break;
479 }
480 }
481 /*
482 * Now close the fid in reclaim list. Free them if they
483 * are already clunked.
484 */
485 while (reclaim_list) {
486 f = reclaim_list;
487 reclaim_list = f->rclm_lst;
488 if (f->fid_type == P9_FID_FILE) {
489 v9fs_co_close(pdu, &f->fs_reclaim);
490 } else if (f->fid_type == P9_FID_DIR) {
491 v9fs_co_closedir(pdu, &f->fs_reclaim);
492 }
493 f->rclm_lst = NULL;
494 /*
495 * Now drop the fid reference, free it
496 * if clunked.
497 */
498 put_fid(pdu, f);
499 }
500 }
501
502 static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path)
503 {
504 int err;
505 V9fsState *s = pdu->s;
506 V9fsFidState *fidp, head_fid;
507
508 head_fid.next = s->fid_list;
509 for (fidp = s->fid_list; fidp; fidp = fidp->next) {
510 if (fidp->path.size != path->size) {
511 continue;
512 }
513 if (!memcmp(fidp->path.data, path->data, path->size)) {
514 /* Mark the fid non reclaimable. */
515 fidp->flags |= FID_NON_RECLAIMABLE;
516
517 /* reopen the file/dir if already closed */
518 err = v9fs_reopen_fid(pdu, fidp);
519 if (err < 0) {
520 return -1;
521 }
522 /*
523 * Go back to head of fid list because
524 * the list could have got updated when
525 * switched to the worker thread
526 */
527 if (err == 0) {
528 fidp = &head_fid;
529 }
530 }
531 }
532 return 0;
533 }
534
535 static void coroutine_fn virtfs_reset(V9fsPDU *pdu)
536 {
537 V9fsState *s = pdu->s;
538 V9fsFidState *fidp;
539
540 /* Free all fids */
541 while (s->fid_list) {
542 /* Get fid */
543 fidp = s->fid_list;
544 fidp->ref++;
545
546 /* Clunk fid */
547 s->fid_list = fidp->next;
548 fidp->clunked = 1;
549
550 put_fid(pdu, fidp);
551 }
552 }
553
554 #define P9_QID_TYPE_DIR 0x80
555 #define P9_QID_TYPE_SYMLINK 0x02
556
557 #define P9_STAT_MODE_DIR 0x80000000
558 #define P9_STAT_MODE_APPEND 0x40000000
559 #define P9_STAT_MODE_EXCL 0x20000000
560 #define P9_STAT_MODE_MOUNT 0x10000000
561 #define P9_STAT_MODE_AUTH 0x08000000
562 #define P9_STAT_MODE_TMP 0x04000000
563 #define P9_STAT_MODE_SYMLINK 0x02000000
564 #define P9_STAT_MODE_LINK 0x01000000
565 #define P9_STAT_MODE_DEVICE 0x00800000
566 #define P9_STAT_MODE_NAMED_PIPE 0x00200000
567 #define P9_STAT_MODE_SOCKET 0x00100000
568 #define P9_STAT_MODE_SETUID 0x00080000
569 #define P9_STAT_MODE_SETGID 0x00040000
570 #define P9_STAT_MODE_SETVTX 0x00010000
571
572 #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
573 P9_STAT_MODE_SYMLINK | \
574 P9_STAT_MODE_LINK | \
575 P9_STAT_MODE_DEVICE | \
576 P9_STAT_MODE_NAMED_PIPE | \
577 P9_STAT_MODE_SOCKET)
578
579 /* This is the algorithm from ufs in spfs */
580 static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
581 {
582 size_t size;
583
584 memset(&qidp->path, 0, sizeof(qidp->path));
585 size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path));
586 memcpy(&qidp->path, &stbuf->st_ino, size);
587 qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8);
588 qidp->type = 0;
589 if (S_ISDIR(stbuf->st_mode)) {
590 qidp->type |= P9_QID_TYPE_DIR;
591 }
592 if (S_ISLNK(stbuf->st_mode)) {
593 qidp->type |= P9_QID_TYPE_SYMLINK;
594 }
595 }
596
597 static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp,
598 V9fsQID *qidp)
599 {
600 struct stat stbuf;
601 int err;
602
603 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
604 if (err < 0) {
605 return err;
606 }
607 stat_to_qid(&stbuf, qidp);
608 return 0;
609 }
610
611 V9fsPDU *pdu_alloc(V9fsState *s)
612 {
613 V9fsPDU *pdu = NULL;
614
615 if (!QLIST_EMPTY(&s->free_list)) {
616 pdu = QLIST_FIRST(&s->free_list);
617 QLIST_REMOVE(pdu, next);
618 QLIST_INSERT_HEAD(&s->active_list, pdu, next);
619 }
620 return pdu;
621 }
622
623 void pdu_free(V9fsPDU *pdu)
624 {
625 V9fsState *s = pdu->s;
626
627 g_assert(!pdu->cancelled);
628 QLIST_REMOVE(pdu, next);
629 QLIST_INSERT_HEAD(&s->free_list, pdu, next);
630 }
631
632 /*
633 * We don't do error checking for pdu_marshal/unmarshal here
634 * because we always expect to have enough space to encode
635 * error details
636 */
637 static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len)
638 {
639 int8_t id = pdu->id + 1; /* Response */
640 V9fsState *s = pdu->s;
641
642 if (len < 0) {
643 int err = -len;
644 len = 7;
645
646 if (s->proto_version != V9FS_PROTO_2000L) {
647 V9fsString str;
648
649 str.data = strerror(err);
650 str.size = strlen(str.data);
651
652 len += pdu_marshal(pdu, len, "s", &str);
653 id = P9_RERROR;
654 }
655
656 len += pdu_marshal(pdu, len, "d", err);
657
658 if (s->proto_version == V9FS_PROTO_2000L) {
659 id = P9_RLERROR;
660 }
661 trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */
662 }
663
664 /* fill out the header */
665 pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);
666
667 /* keep these in sync */
668 pdu->size = len;
669 pdu->id = id;
670
671 pdu_push_and_notify(pdu);
672
673 /* Now wakeup anybody waiting in flush for this request */
674 if (!qemu_co_queue_next(&pdu->complete)) {
675 pdu_free(pdu);
676 }
677 }
678
679 static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
680 {
681 mode_t ret;
682
683 ret = mode & 0777;
684 if (mode & P9_STAT_MODE_DIR) {
685 ret |= S_IFDIR;
686 }
687
688 if (mode & P9_STAT_MODE_SYMLINK) {
689 ret |= S_IFLNK;
690 }
691 if (mode & P9_STAT_MODE_SOCKET) {
692 ret |= S_IFSOCK;
693 }
694 if (mode & P9_STAT_MODE_NAMED_PIPE) {
695 ret |= S_IFIFO;
696 }
697 if (mode & P9_STAT_MODE_DEVICE) {
698 if (extension->size && extension->data[0] == 'c') {
699 ret |= S_IFCHR;
700 } else {
701 ret |= S_IFBLK;
702 }
703 }
704
705 if (!(ret&~0777)) {
706 ret |= S_IFREG;
707 }
708
709 if (mode & P9_STAT_MODE_SETUID) {
710 ret |= S_ISUID;
711 }
712 if (mode & P9_STAT_MODE_SETGID) {
713 ret |= S_ISGID;
714 }
715 if (mode & P9_STAT_MODE_SETVTX) {
716 ret |= S_ISVTX;
717 }
718
719 return ret;
720 }
721
722 static int donttouch_stat(V9fsStat *stat)
723 {
724 if (stat->type == -1 &&
725 stat->dev == -1 &&
726 stat->qid.type == -1 &&
727 stat->qid.version == -1 &&
728 stat->qid.path == -1 &&
729 stat->mode == -1 &&
730 stat->atime == -1 &&
731 stat->mtime == -1 &&
732 stat->length == -1 &&
733 !stat->name.size &&
734 !stat->uid.size &&
735 !stat->gid.size &&
736 !stat->muid.size &&
737 stat->n_uid == -1 &&
738 stat->n_gid == -1 &&
739 stat->n_muid == -1) {
740 return 1;
741 }
742
743 return 0;
744 }
745
746 static void v9fs_stat_init(V9fsStat *stat)
747 {
748 v9fs_string_init(&stat->name);
749 v9fs_string_init(&stat->uid);
750 v9fs_string_init(&stat->gid);
751 v9fs_string_init(&stat->muid);
752 v9fs_string_init(&stat->extension);
753 }
754
755 static void v9fs_stat_free(V9fsStat *stat)
756 {
757 v9fs_string_free(&stat->name);
758 v9fs_string_free(&stat->uid);
759 v9fs_string_free(&stat->gid);
760 v9fs_string_free(&stat->muid);
761 v9fs_string_free(&stat->extension);
762 }
763
764 static uint32_t stat_to_v9mode(const struct stat *stbuf)
765 {
766 uint32_t mode;
767
768 mode = stbuf->st_mode & 0777;
769 if (S_ISDIR(stbuf->st_mode)) {
770 mode |= P9_STAT_MODE_DIR;
771 }
772
773 if (S_ISLNK(stbuf->st_mode)) {
774 mode |= P9_STAT_MODE_SYMLINK;
775 }
776
777 if (S_ISSOCK(stbuf->st_mode)) {
778 mode |= P9_STAT_MODE_SOCKET;
779 }
780
781 if (S_ISFIFO(stbuf->st_mode)) {
782 mode |= P9_STAT_MODE_NAMED_PIPE;
783 }
784
785 if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
786 mode |= P9_STAT_MODE_DEVICE;
787 }
788
789 if (stbuf->st_mode & S_ISUID) {
790 mode |= P9_STAT_MODE_SETUID;
791 }
792
793 if (stbuf->st_mode & S_ISGID) {
794 mode |= P9_STAT_MODE_SETGID;
795 }
796
797 if (stbuf->st_mode & S_ISVTX) {
798 mode |= P9_STAT_MODE_SETVTX;
799 }
800
801 return mode;
802 }
803
804 static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name,
805 const struct stat *stbuf,
806 V9fsStat *v9stat)
807 {
808 int err;
809 const char *str;
810
811 memset(v9stat, 0, sizeof(*v9stat));
812
813 stat_to_qid(stbuf, &v9stat->qid);
814 v9stat->mode = stat_to_v9mode(stbuf);
815 v9stat->atime = stbuf->st_atime;
816 v9stat->mtime = stbuf->st_mtime;
817 v9stat->length = stbuf->st_size;
818
819 v9fs_string_free(&v9stat->uid);
820 v9fs_string_free(&v9stat->gid);
821 v9fs_string_free(&v9stat->muid);
822
823 v9stat->n_uid = stbuf->st_uid;
824 v9stat->n_gid = stbuf->st_gid;
825 v9stat->n_muid = 0;
826
827 v9fs_string_free(&v9stat->extension);
828
829 if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
830 err = v9fs_co_readlink(pdu, name, &v9stat->extension);
831 if (err < 0) {
832 return err;
833 }
834 } else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
835 v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
836 S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
837 major(stbuf->st_rdev), minor(stbuf->st_rdev));
838 } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
839 v9fs_string_sprintf(&v9stat->extension, "%s %lu",
840 "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
841 }
842
843 str = strrchr(name->data, '/');
844 if (str) {
845 str += 1;
846 } else {
847 str = name->data;
848 }
849
850 v9fs_string_sprintf(&v9stat->name, "%s", str);
851
852 v9stat->size = 61 +
853 v9fs_string_size(&v9stat->name) +
854 v9fs_string_size(&v9stat->uid) +
855 v9fs_string_size(&v9stat->gid) +
856 v9fs_string_size(&v9stat->muid) +
857 v9fs_string_size(&v9stat->extension);
858 return 0;
859 }
860
861 #define P9_STATS_MODE 0x00000001ULL
862 #define P9_STATS_NLINK 0x00000002ULL
863 #define P9_STATS_UID 0x00000004ULL
864 #define P9_STATS_GID 0x00000008ULL
865 #define P9_STATS_RDEV 0x00000010ULL
866 #define P9_STATS_ATIME 0x00000020ULL
867 #define P9_STATS_MTIME 0x00000040ULL
868 #define P9_STATS_CTIME 0x00000080ULL
869 #define P9_STATS_INO 0x00000100ULL
870 #define P9_STATS_SIZE 0x00000200ULL
871 #define P9_STATS_BLOCKS 0x00000400ULL
872
873 #define P9_STATS_BTIME 0x00000800ULL
874 #define P9_STATS_GEN 0x00001000ULL
875 #define P9_STATS_DATA_VERSION 0x00002000ULL
876
877 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
878 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
879
880
881 static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
882 V9fsStatDotl *v9lstat)
883 {
884 memset(v9lstat, 0, sizeof(*v9lstat));
885
886 v9lstat->st_mode = stbuf->st_mode;
887 v9lstat->st_nlink = stbuf->st_nlink;
888 v9lstat->st_uid = stbuf->st_uid;
889 v9lstat->st_gid = stbuf->st_gid;
890 v9lstat->st_rdev = stbuf->st_rdev;
891 v9lstat->st_size = stbuf->st_size;
892 v9lstat->st_blksize = stbuf->st_blksize;
893 v9lstat->st_blocks = stbuf->st_blocks;
894 v9lstat->st_atime_sec = stbuf->st_atime;
895 v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
896 v9lstat->st_mtime_sec = stbuf->st_mtime;
897 v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
898 v9lstat->st_ctime_sec = stbuf->st_ctime;
899 v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
900 /* Currently we only support BASIC fields in stat */
901 v9lstat->st_result_mask = P9_STATS_BASIC;
902
903 stat_to_qid(stbuf, &v9lstat->qid);
904 }
905
906 static void print_sg(struct iovec *sg, int cnt)
907 {
908 int i;
909
910 printf("sg[%d]: {", cnt);
911 for (i = 0; i < cnt; i++) {
912 if (i) {
913 printf(", ");
914 }
915 printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
916 }
917 printf("}\n");
918 }
919
920 /* Will call this only for path name based fid */
921 static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len)
922 {
923 V9fsPath str;
924 v9fs_path_init(&str);
925 v9fs_path_copy(&str, dst);
926 v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len);
927 v9fs_path_free(&str);
928 }
929
930 static inline bool is_ro_export(FsContext *ctx)
931 {
932 return ctx->export_flags & V9FS_RDONLY;
933 }
934
935 static void coroutine_fn v9fs_version(void *opaque)
936 {
937 ssize_t err;
938 V9fsPDU *pdu = opaque;
939 V9fsState *s = pdu->s;
940 V9fsString version;
941 size_t offset = 7;
942
943 v9fs_string_init(&version);
944 err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
945 if (err < 0) {
946 offset = err;
947 goto out;
948 }
949 trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data);
950
951 virtfs_reset(pdu);
952
953 if (!strcmp(version.data, "9P2000.u")) {
954 s->proto_version = V9FS_PROTO_2000U;
955 } else if (!strcmp(version.data, "9P2000.L")) {
956 s->proto_version = V9FS_PROTO_2000L;
957 } else {
958 v9fs_string_sprintf(&version, "unknown");
959 }
960
961 err = pdu_marshal(pdu, offset, "ds", s->msize, &version);
962 if (err < 0) {
963 offset = err;
964 goto out;
965 }
966 offset += err;
967 trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data);
968 out:
969 pdu_complete(pdu, offset);
970 v9fs_string_free(&version);
971 }
972
973 static void coroutine_fn v9fs_attach(void *opaque)
974 {
975 V9fsPDU *pdu = opaque;
976 V9fsState *s = pdu->s;
977 int32_t fid, afid, n_uname;
978 V9fsString uname, aname;
979 V9fsFidState *fidp;
980 size_t offset = 7;
981 V9fsQID qid;
982 ssize_t err;
983 Error *local_err = NULL;
984
985 v9fs_string_init(&uname);
986 v9fs_string_init(&aname);
987 err = pdu_unmarshal(pdu, offset, "ddssd", &fid,
988 &afid, &uname, &aname, &n_uname);
989 if (err < 0) {
990 goto out_nofid;
991 }
992 trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data);
993
994 fidp = alloc_fid(s, fid);
995 if (fidp == NULL) {
996 err = -EINVAL;
997 goto out_nofid;
998 }
999 fidp->uid = n_uname;
1000 err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path);
1001 if (err < 0) {
1002 err = -EINVAL;
1003 clunk_fid(s, fid);
1004 goto out;
1005 }
1006 err = fid_to_qid(pdu, fidp, &qid);
1007 if (err < 0) {
1008 err = -EINVAL;
1009 clunk_fid(s, fid);
1010 goto out;
1011 }
1012
1013 /*
1014 * disable migration if we haven't done already.
1015 * attach could get called multiple times for the same export.
1016 */
1017 if (!s->migration_blocker) {
1018 error_setg(&s->migration_blocker,
1019 "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'",
1020 s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag);
1021 err = migrate_add_blocker(s->migration_blocker, &local_err);
1022 if (local_err) {
1023 error_free(local_err);
1024 error_free(s->migration_blocker);
1025 s->migration_blocker = NULL;
1026 clunk_fid(s, fid);
1027 goto out;
1028 }
1029 s->root_fid = fid;
1030 }
1031
1032 err = pdu_marshal(pdu, offset, "Q", &qid);
1033 if (err < 0) {
1034 clunk_fid(s, fid);
1035 goto out;
1036 }
1037 err += offset;
1038
1039 memcpy(&s->root_qid, &qid, sizeof(qid));
1040 trace_v9fs_attach_return(pdu->tag, pdu->id,
1041 qid.type, qid.version, qid.path);
1042 out:
1043 put_fid(pdu, fidp);
1044 out_nofid:
1045 pdu_complete(pdu, err);
1046 v9fs_string_free(&uname);
1047 v9fs_string_free(&aname);
1048 }
1049
1050 static void coroutine_fn v9fs_stat(void *opaque)
1051 {
1052 int32_t fid;
1053 V9fsStat v9stat;
1054 ssize_t err = 0;
1055 size_t offset = 7;
1056 struct stat stbuf;
1057 V9fsFidState *fidp;
1058 V9fsPDU *pdu = opaque;
1059
1060 err = pdu_unmarshal(pdu, offset, "d", &fid);
1061 if (err < 0) {
1062 goto out_nofid;
1063 }
1064 trace_v9fs_stat(pdu->tag, pdu->id, fid);
1065
1066 fidp = get_fid(pdu, fid);
1067 if (fidp == NULL) {
1068 err = -ENOENT;
1069 goto out_nofid;
1070 }
1071 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1072 if (err < 0) {
1073 goto out;
1074 }
1075 err = stat_to_v9stat(pdu, &fidp->path, &stbuf, &v9stat);
1076 if (err < 0) {
1077 goto out;
1078 }
1079 err = pdu_marshal(pdu, offset, "wS", 0, &v9stat);
1080 if (err < 0) {
1081 v9fs_stat_free(&v9stat);
1082 goto out;
1083 }
1084 trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode,
1085 v9stat.atime, v9stat.mtime, v9stat.length);
1086 err += offset;
1087 v9fs_stat_free(&v9stat);
1088 out:
1089 put_fid(pdu, fidp);
1090 out_nofid:
1091 pdu_complete(pdu, err);
1092 }
1093
1094 static void coroutine_fn v9fs_getattr(void *opaque)
1095 {
1096 int32_t fid;
1097 size_t offset = 7;
1098 ssize_t retval = 0;
1099 struct stat stbuf;
1100 V9fsFidState *fidp;
1101 uint64_t request_mask;
1102 V9fsStatDotl v9stat_dotl;
1103 V9fsPDU *pdu = opaque;
1104 V9fsState *s = pdu->s;
1105
1106 retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask);
1107 if (retval < 0) {
1108 goto out_nofid;
1109 }
1110 trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask);
1111
1112 fidp = get_fid(pdu, fid);
1113 if (fidp == NULL) {
1114 retval = -ENOENT;
1115 goto out_nofid;
1116 }
1117 /*
1118 * Currently we only support BASIC fields in stat, so there is no
1119 * need to look at request_mask.
1120 */
1121 retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1122 if (retval < 0) {
1123 goto out;
1124 }
1125 stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl);
1126
1127 /* fill st_gen if requested and supported by underlying fs */
1128 if (request_mask & P9_STATS_GEN) {
1129 retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl);
1130 switch (retval) {
1131 case 0:
1132 /* we have valid st_gen: update result mask */
1133 v9stat_dotl.st_result_mask |= P9_STATS_GEN;
1134 break;
1135 case -EINTR:
1136 /* request cancelled, e.g. by Tflush */
1137 goto out;
1138 default:
1139 /* failed to get st_gen: not fatal, ignore */
1140 break;
1141 }
1142 }
1143 retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl);
1144 if (retval < 0) {
1145 goto out;
1146 }
1147 retval += offset;
1148 trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask,
1149 v9stat_dotl.st_mode, v9stat_dotl.st_uid,
1150 v9stat_dotl.st_gid);
1151 out:
1152 put_fid(pdu, fidp);
1153 out_nofid:
1154 pdu_complete(pdu, retval);
1155 }
1156
1157 /* Attribute flags */
1158 #define P9_ATTR_MODE (1 << 0)
1159 #define P9_ATTR_UID (1 << 1)
1160 #define P9_ATTR_GID (1 << 2)
1161 #define P9_ATTR_SIZE (1 << 3)
1162 #define P9_ATTR_ATIME (1 << 4)
1163 #define P9_ATTR_MTIME (1 << 5)
1164 #define P9_ATTR_CTIME (1 << 6)
1165 #define P9_ATTR_ATIME_SET (1 << 7)
1166 #define P9_ATTR_MTIME_SET (1 << 8)
1167
1168 #define P9_ATTR_MASK 127
1169
1170 static void coroutine_fn v9fs_setattr(void *opaque)
1171 {
1172 int err = 0;
1173 int32_t fid;
1174 V9fsFidState *fidp;
1175 size_t offset = 7;
1176 V9fsIattr v9iattr;
1177 V9fsPDU *pdu = opaque;
1178
1179 err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr);
1180 if (err < 0) {
1181 goto out_nofid;
1182 }
1183
1184 fidp = get_fid(pdu, fid);
1185 if (fidp == NULL) {
1186 err = -EINVAL;
1187 goto out_nofid;
1188 }
1189 if (v9iattr.valid & P9_ATTR_MODE) {
1190 err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode);
1191 if (err < 0) {
1192 goto out;
1193 }
1194 }
1195 if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) {
1196 struct timespec times[2];
1197 if (v9iattr.valid & P9_ATTR_ATIME) {
1198 if (v9iattr.valid & P9_ATTR_ATIME_SET) {
1199 times[0].tv_sec = v9iattr.atime_sec;
1200 times[0].tv_nsec = v9iattr.atime_nsec;
1201 } else {
1202 times[0].tv_nsec = UTIME_NOW;
1203 }
1204 } else {
1205 times[0].tv_nsec = UTIME_OMIT;
1206 }
1207 if (v9iattr.valid & P9_ATTR_MTIME) {
1208 if (v9iattr.valid & P9_ATTR_MTIME_SET) {
1209 times[1].tv_sec = v9iattr.mtime_sec;
1210 times[1].tv_nsec = v9iattr.mtime_nsec;
1211 } else {
1212 times[1].tv_nsec = UTIME_NOW;
1213 }
1214 } else {
1215 times[1].tv_nsec = UTIME_OMIT;
1216 }
1217 err = v9fs_co_utimensat(pdu, &fidp->path, times);
1218 if (err < 0) {
1219 goto out;
1220 }
1221 }
1222 /*
1223 * If the only valid entry in iattr is ctime we can call
1224 * chown(-1,-1) to update the ctime of the file
1225 */
1226 if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) ||
1227 ((v9iattr.valid & P9_ATTR_CTIME)
1228 && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) {
1229 if (!(v9iattr.valid & P9_ATTR_UID)) {
1230 v9iattr.uid = -1;
1231 }
1232 if (!(v9iattr.valid & P9_ATTR_GID)) {
1233 v9iattr.gid = -1;
1234 }
1235 err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid,
1236 v9iattr.gid);
1237 if (err < 0) {
1238 goto out;
1239 }
1240 }
1241 if (v9iattr.valid & (P9_ATTR_SIZE)) {
1242 err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size);
1243 if (err < 0) {
1244 goto out;
1245 }
1246 }
1247 err = offset;
1248 out:
1249 put_fid(pdu, fidp);
1250 out_nofid:
1251 pdu_complete(pdu, err);
1252 }
1253
1254 static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids)
1255 {
1256 int i;
1257 ssize_t err;
1258 size_t offset = 7;
1259
1260 err = pdu_marshal(pdu, offset, "w", nwnames);
1261 if (err < 0) {
1262 return err;
1263 }
1264 offset += err;
1265 for (i = 0; i < nwnames; i++) {
1266 err = pdu_marshal(pdu, offset, "Q", &qids[i]);
1267 if (err < 0) {
1268 return err;
1269 }
1270 offset += err;
1271 }
1272 return offset;
1273 }
1274
1275 static bool name_is_illegal(const char *name)
1276 {
1277 return !*name || strchr(name, '/') != NULL;
1278 }
1279
1280 static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2)
1281 {
1282 return
1283 qid1->type != qid2->type ||
1284 qid1->version != qid2->version ||
1285 qid1->path != qid2->path;
1286 }
1287
1288 static void coroutine_fn v9fs_walk(void *opaque)
1289 {
1290 int name_idx;
1291 V9fsQID *qids = NULL;
1292 int i, err = 0;
1293 V9fsPath dpath, path;
1294 uint16_t nwnames;
1295 struct stat stbuf;
1296 size_t offset = 7;
1297 int32_t fid, newfid;
1298 V9fsString *wnames = NULL;
1299 V9fsFidState *fidp;
1300 V9fsFidState *newfidp = NULL;
1301 V9fsPDU *pdu = opaque;
1302 V9fsState *s = pdu->s;
1303 V9fsQID qid;
1304
1305 err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames);
1306 if (err < 0) {
1307 pdu_complete(pdu, err);
1308 return ;
1309 }
1310 offset += err;
1311
1312 trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames);
1313
1314 if (nwnames && nwnames <= P9_MAXWELEM) {
1315 wnames = g_malloc0(sizeof(wnames[0]) * nwnames);
1316 qids = g_malloc0(sizeof(qids[0]) * nwnames);
1317 for (i = 0; i < nwnames; i++) {
1318 err = pdu_unmarshal(pdu, offset, "s", &wnames[i]);
1319 if (err < 0) {
1320 goto out_nofid;
1321 }
1322 if (name_is_illegal(wnames[i].data)) {
1323 err = -ENOENT;
1324 goto out_nofid;
1325 }
1326 offset += err;
1327 }
1328 } else if (nwnames > P9_MAXWELEM) {
1329 err = -EINVAL;
1330 goto out_nofid;
1331 }
1332 fidp = get_fid(pdu, fid);
1333 if (fidp == NULL) {
1334 err = -ENOENT;
1335 goto out_nofid;
1336 }
1337
1338 v9fs_path_init(&dpath);
1339 v9fs_path_init(&path);
1340
1341 err = fid_to_qid(pdu, fidp, &qid);
1342 if (err < 0) {
1343 goto out;
1344 }
1345
1346 /*
1347 * Both dpath and path initially poin to fidp.
1348 * Needed to handle request with nwnames == 0
1349 */
1350 v9fs_path_copy(&dpath, &fidp->path);
1351 v9fs_path_copy(&path, &fidp->path);
1352 for (name_idx = 0; name_idx < nwnames; name_idx++) {
1353 if (not_same_qid(&pdu->s->root_qid, &qid) ||
1354 strcmp("..", wnames[name_idx].data)) {
1355 err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data,
1356 &path);
1357 if (err < 0) {
1358 goto out;
1359 }
1360
1361 err = v9fs_co_lstat(pdu, &path, &stbuf);
1362 if (err < 0) {
1363 goto out;
1364 }
1365 stat_to_qid(&stbuf, &qid);
1366 v9fs_path_copy(&dpath, &path);
1367 }
1368 memcpy(&qids[name_idx], &qid, sizeof(qid));
1369 }
1370 if (fid == newfid) {
1371 if (fidp->fid_type != P9_FID_NONE) {
1372 err = -EINVAL;
1373 goto out;
1374 }
1375 v9fs_path_copy(&fidp->path, &path);
1376 } else {
1377 newfidp = alloc_fid(s, newfid);
1378 if (newfidp == NULL) {
1379 err = -EINVAL;
1380 goto out;
1381 }
1382 newfidp->uid = fidp->uid;
1383 v9fs_path_copy(&newfidp->path, &path);
1384 }
1385 err = v9fs_walk_marshal(pdu, nwnames, qids);
1386 trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids);
1387 out:
1388 put_fid(pdu, fidp);
1389 if (newfidp) {
1390 put_fid(pdu, newfidp);
1391 }
1392 v9fs_path_free(&dpath);
1393 v9fs_path_free(&path);
1394 out_nofid:
1395 pdu_complete(pdu, err);
1396 if (nwnames && nwnames <= P9_MAXWELEM) {
1397 for (name_idx = 0; name_idx < nwnames; name_idx++) {
1398 v9fs_string_free(&wnames[name_idx]);
1399 }
1400 g_free(wnames);
1401 g_free(qids);
1402 }
1403 }
1404
1405 static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path)
1406 {
1407 struct statfs stbuf;
1408 int32_t iounit = 0;
1409 V9fsState *s = pdu->s;
1410
1411 /*
1412 * iounit should be multiples of f_bsize (host filesystem block size
1413 * and as well as less than (client msize - P9_IOHDRSZ))
1414 */
1415 if (!v9fs_co_statfs(pdu, path, &stbuf)) {
1416 iounit = stbuf.f_bsize;
1417 iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
1418 }
1419 if (!iounit) {
1420 iounit = s->msize - P9_IOHDRSZ;
1421 }
1422 return iounit;
1423 }
1424
1425 static void coroutine_fn v9fs_open(void *opaque)
1426 {
1427 int flags;
1428 int32_t fid;
1429 int32_t mode;
1430 V9fsQID qid;
1431 int iounit = 0;
1432 ssize_t err = 0;
1433 size_t offset = 7;
1434 struct stat stbuf;
1435 V9fsFidState *fidp;
1436 V9fsPDU *pdu = opaque;
1437 V9fsState *s = pdu->s;
1438
1439 if (s->proto_version == V9FS_PROTO_2000L) {
1440 err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode);
1441 } else {
1442 uint8_t modebyte;
1443 err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte);
1444 mode = modebyte;
1445 }
1446 if (err < 0) {
1447 goto out_nofid;
1448 }
1449 trace_v9fs_open(pdu->tag, pdu->id, fid, mode);
1450
1451 fidp = get_fid(pdu, fid);
1452 if (fidp == NULL) {
1453 err = -ENOENT;
1454 goto out_nofid;
1455 }
1456 if (fidp->fid_type != P9_FID_NONE) {
1457 err = -EINVAL;
1458 goto out;
1459 }
1460
1461 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1462 if (err < 0) {
1463 goto out;
1464 }
1465 stat_to_qid(&stbuf, &qid);
1466 if (S_ISDIR(stbuf.st_mode)) {
1467 err = v9fs_co_opendir(pdu, fidp);
1468 if (err < 0) {
1469 goto out;
1470 }
1471 fidp->fid_type = P9_FID_DIR;
1472 err = pdu_marshal(pdu, offset, "Qd", &qid, 0);
1473 if (err < 0) {
1474 goto out;
1475 }
1476 err += offset;
1477 } else {
1478 if (s->proto_version == V9FS_PROTO_2000L) {
1479 flags = get_dotl_openflags(s, mode);
1480 } else {
1481 flags = omode_to_uflags(mode);
1482 }
1483 if (is_ro_export(&s->ctx)) {
1484 if (mode & O_WRONLY || mode & O_RDWR ||
1485 mode & O_APPEND || mode & O_TRUNC) {
1486 err = -EROFS;
1487 goto out;
1488 }
1489 }
1490 err = v9fs_co_open(pdu, fidp, flags);
1491 if (err < 0) {
1492 goto out;
1493 }
1494 fidp->fid_type = P9_FID_FILE;
1495 fidp->open_flags = flags;
1496 if (flags & O_EXCL) {
1497 /*
1498 * We let the host file system do O_EXCL check
1499 * We should not reclaim such fd
1500 */
1501 fidp->flags |= FID_NON_RECLAIMABLE;
1502 }
1503 iounit = get_iounit(pdu, &fidp->path);
1504 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
1505 if (err < 0) {
1506 goto out;
1507 }
1508 err += offset;
1509 }
1510 trace_v9fs_open_return(pdu->tag, pdu->id,
1511 qid.type, qid.version, qid.path, iounit);
1512 out:
1513 put_fid(pdu, fidp);
1514 out_nofid:
1515 pdu_complete(pdu, err);
1516 }
1517
1518 static void coroutine_fn v9fs_lcreate(void *opaque)
1519 {
1520 int32_t dfid, flags, mode;
1521 gid_t gid;
1522 ssize_t err = 0;
1523 ssize_t offset = 7;
1524 V9fsString name;
1525 V9fsFidState *fidp;
1526 struct stat stbuf;
1527 V9fsQID qid;
1528 int32_t iounit;
1529 V9fsPDU *pdu = opaque;
1530
1531 v9fs_string_init(&name);
1532 err = pdu_unmarshal(pdu, offset, "dsddd", &dfid,
1533 &name, &flags, &mode, &gid);
1534 if (err < 0) {
1535 goto out_nofid;
1536 }
1537 trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid);
1538
1539 if (name_is_illegal(name.data)) {
1540 err = -ENOENT;
1541 goto out_nofid;
1542 }
1543
1544 if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
1545 err = -EEXIST;
1546 goto out_nofid;
1547 }
1548
1549 fidp = get_fid(pdu, dfid);
1550 if (fidp == NULL) {
1551 err = -ENOENT;
1552 goto out_nofid;
1553 }
1554 if (fidp->fid_type != P9_FID_NONE) {
1555 err = -EINVAL;
1556 goto out;
1557 }
1558
1559 flags = get_dotl_openflags(pdu->s, flags);
1560 err = v9fs_co_open2(pdu, fidp, &name, gid,
1561 flags | O_CREAT, mode, &stbuf);
1562 if (err < 0) {
1563 goto out;
1564 }
1565 fidp->fid_type = P9_FID_FILE;
1566 fidp->open_flags = flags;
1567 if (flags & O_EXCL) {
1568 /*
1569 * We let the host file system do O_EXCL check
1570 * We should not reclaim such fd
1571 */
1572 fidp->flags |= FID_NON_RECLAIMABLE;
1573 }
1574 iounit = get_iounit(pdu, &fidp->path);
1575 stat_to_qid(&stbuf, &qid);
1576 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
1577 if (err < 0) {
1578 goto out;
1579 }
1580 err += offset;
1581 trace_v9fs_lcreate_return(pdu->tag, pdu->id,
1582 qid.type, qid.version, qid.path, iounit);
1583 out:
1584 put_fid(pdu, fidp);
1585 out_nofid:
1586 pdu_complete(pdu, err);
1587 v9fs_string_free(&name);
1588 }
1589
1590 static void coroutine_fn v9fs_fsync(void *opaque)
1591 {
1592 int err;
1593 int32_t fid;
1594 int datasync;
1595 size_t offset = 7;
1596 V9fsFidState *fidp;
1597 V9fsPDU *pdu = opaque;
1598
1599 err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync);
1600 if (err < 0) {
1601 goto out_nofid;
1602 }
1603 trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync);
1604
1605 fidp = get_fid(pdu, fid);
1606 if (fidp == NULL) {
1607 err = -ENOENT;
1608 goto out_nofid;
1609 }
1610 err = v9fs_co_fsync(pdu, fidp, datasync);
1611 if (!err) {
1612 err = offset;
1613 }
1614 put_fid(pdu, fidp);
1615 out_nofid:
1616 pdu_complete(pdu, err);
1617 }
1618
1619 static void coroutine_fn v9fs_clunk(void *opaque)
1620 {
1621 int err;
1622 int32_t fid;
1623 size_t offset = 7;
1624 V9fsFidState *fidp;
1625 V9fsPDU *pdu = opaque;
1626 V9fsState *s = pdu->s;
1627
1628 err = pdu_unmarshal(pdu, offset, "d", &fid);
1629 if (err < 0) {
1630 goto out_nofid;
1631 }
1632 trace_v9fs_clunk(pdu->tag, pdu->id, fid);
1633
1634 fidp = clunk_fid(s, fid);
1635 if (fidp == NULL) {
1636 err = -ENOENT;
1637 goto out_nofid;
1638 }
1639 /*
1640 * Bump the ref so that put_fid will
1641 * free the fid.
1642 */
1643 fidp->ref++;
1644 err = put_fid(pdu, fidp);
1645 if (!err) {
1646 err = offset;
1647 }
1648 out_nofid:
1649 pdu_complete(pdu, err);
1650 }
1651
1652 /*
1653 * Create a QEMUIOVector for a sub-region of PDU iovecs
1654 *
1655 * @qiov: uninitialized QEMUIOVector
1656 * @skip: number of bytes to skip from beginning of PDU
1657 * @size: number of bytes to include
1658 * @is_write: true - write, false - read
1659 *
1660 * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up
1661 * with qemu_iovec_destroy().
1662 */
1663 static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu,
1664 size_t skip, size_t size,
1665 bool is_write)
1666 {
1667 QEMUIOVector elem;
1668 struct iovec *iov;
1669 unsigned int niov;
1670
1671 if (is_write) {
1672 pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov);
1673 } else {
1674 pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip);
1675 }
1676
1677 qemu_iovec_init_external(&elem, iov, niov);
1678 qemu_iovec_init(qiov, niov);
1679 qemu_iovec_concat(qiov, &elem, skip, size);
1680 }
1681
1682 static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
1683 uint64_t off, uint32_t max_count)
1684 {
1685 ssize_t err;
1686 size_t offset = 7;
1687 uint64_t read_count;
1688 QEMUIOVector qiov_full;
1689
1690 if (fidp->fs.xattr.len < off) {
1691 read_count = 0;
1692 } else {
1693 read_count = fidp->fs.xattr.len - off;
1694 }
1695 if (read_count > max_count) {
1696 read_count = max_count;
1697 }
1698 err = pdu_marshal(pdu, offset, "d", read_count);
1699 if (err < 0) {
1700 return err;
1701 }
1702 offset += err;
1703
1704 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false);
1705 err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0,
1706 ((char *)fidp->fs.xattr.value) + off,
1707 read_count);
1708 qemu_iovec_destroy(&qiov_full);
1709 if (err < 0) {
1710 return err;
1711 }
1712 offset += err;
1713 return offset;
1714 }
1715
1716 static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu,
1717 V9fsFidState *fidp,
1718 uint32_t max_count)
1719 {
1720 V9fsPath path;
1721 V9fsStat v9stat;
1722 int len, err = 0;
1723 int32_t count = 0;
1724 struct stat stbuf;
1725 off_t saved_dir_pos;
1726 struct dirent *dent;
1727
1728 /* save the directory position */
1729 saved_dir_pos = v9fs_co_telldir(pdu, fidp);
1730 if (saved_dir_pos < 0) {
1731 return saved_dir_pos;
1732 }
1733
1734 while (1) {
1735 v9fs_path_init(&path);
1736
1737 v9fs_readdir_lock(&fidp->fs.dir);
1738
1739 err = v9fs_co_readdir(pdu, fidp, &dent);
1740 if (err || !dent) {
1741 break;
1742 }
1743 err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path);
1744 if (err < 0) {
1745 break;
1746 }
1747 err = v9fs_co_lstat(pdu, &path, &stbuf);
1748 if (err < 0) {
1749 break;
1750 }
1751 err = stat_to_v9stat(pdu, &path, &stbuf, &v9stat);
1752 if (err < 0) {
1753 break;
1754 }
1755 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1756 len = pdu_marshal(pdu, 11 + count, "S", &v9stat);
1757
1758 v9fs_readdir_unlock(&fidp->fs.dir);
1759
1760 if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) {
1761 /* Ran out of buffer. Set dir back to old position and return */
1762 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1763 v9fs_stat_free(&v9stat);
1764 v9fs_path_free(&path);
1765 return count;
1766 }
1767 count += len;
1768 v9fs_stat_free(&v9stat);
1769 v9fs_path_free(&path);
1770 saved_dir_pos = dent->d_off;
1771 }
1772
1773 v9fs_readdir_unlock(&fidp->fs.dir);
1774
1775 v9fs_path_free(&path);
1776 if (err < 0) {
1777 return err;
1778 }
1779 return count;
1780 }
1781
1782 static void coroutine_fn v9fs_read(void *opaque)
1783 {
1784 int32_t fid;
1785 uint64_t off;
1786 ssize_t err = 0;
1787 int32_t count = 0;
1788 size_t offset = 7;
1789 uint32_t max_count;
1790 V9fsFidState *fidp;
1791 V9fsPDU *pdu = opaque;
1792 V9fsState *s = pdu->s;
1793
1794 err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count);
1795 if (err < 0) {
1796 goto out_nofid;
1797 }
1798 trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count);
1799
1800 fidp = get_fid(pdu, fid);
1801 if (fidp == NULL) {
1802 err = -EINVAL;
1803 goto out_nofid;
1804 }
1805 if (fidp->fid_type == P9_FID_DIR) {
1806
1807 if (off == 0) {
1808 v9fs_co_rewinddir(pdu, fidp);
1809 }
1810 count = v9fs_do_readdir_with_stat(pdu, fidp, max_count);
1811 if (count < 0) {
1812 err = count;
1813 goto out;
1814 }
1815 err = pdu_marshal(pdu, offset, "d", count);
1816 if (err < 0) {
1817 goto out;
1818 }
1819 err += offset + count;
1820 } else if (fidp->fid_type == P9_FID_FILE) {
1821 QEMUIOVector qiov_full;
1822 QEMUIOVector qiov;
1823 int32_t len;
1824
1825 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false);
1826 qemu_iovec_init(&qiov, qiov_full.niov);
1827 do {
1828 qemu_iovec_reset(&qiov);
1829 qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count);
1830 if (0) {
1831 print_sg(qiov.iov, qiov.niov);
1832 }
1833 /* Loop in case of EINTR */
1834 do {
1835 len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off);
1836 if (len >= 0) {
1837 off += len;
1838 count += len;
1839 }
1840 } while (len == -EINTR && !pdu->cancelled);
1841 if (len < 0) {
1842 /* IO error return the error */
1843 err = len;
1844 goto out_free_iovec;
1845 }
1846 } while (count < max_count && len > 0);
1847 err = pdu_marshal(pdu, offset, "d", count);
1848 if (err < 0) {
1849 goto out_free_iovec;
1850 }
1851 err += offset + count;
1852 out_free_iovec:
1853 qemu_iovec_destroy(&qiov);
1854 qemu_iovec_destroy(&qiov_full);
1855 } else if (fidp->fid_type == P9_FID_XATTR) {
1856 err = v9fs_xattr_read(s, pdu, fidp, off, max_count);
1857 } else {
1858 err = -EINVAL;
1859 }
1860 trace_v9fs_read_return(pdu->tag, pdu->id, count, err);
1861 out:
1862 put_fid(pdu, fidp);
1863 out_nofid:
1864 pdu_complete(pdu, err);
1865 }
1866
1867 static size_t v9fs_readdir_data_size(V9fsString *name)
1868 {
1869 /*
1870 * Size of each dirent on the wire: size of qid (13) + size of offset (8)
1871 * size of type (1) + size of name.size (2) + strlen(name.data)
1872 */
1873 return 24 + v9fs_string_size(name);
1874 }
1875
1876 static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp,
1877 int32_t max_count)
1878 {
1879 size_t size;
1880 V9fsQID qid;
1881 V9fsString name;
1882 int len, err = 0;
1883 int32_t count = 0;
1884 off_t saved_dir_pos;
1885 struct dirent *dent;
1886
1887 /* save the directory position */
1888 saved_dir_pos = v9fs_co_telldir(pdu, fidp);
1889 if (saved_dir_pos < 0) {
1890 return saved_dir_pos;
1891 }
1892
1893 while (1) {
1894 v9fs_readdir_lock(&fidp->fs.dir);
1895
1896 err = v9fs_co_readdir(pdu, fidp, &dent);
1897 if (err || !dent) {
1898 break;
1899 }
1900 v9fs_string_init(&name);
1901 v9fs_string_sprintf(&name, "%s", dent->d_name);
1902 if ((count + v9fs_readdir_data_size(&name)) > max_count) {
1903 v9fs_readdir_unlock(&fidp->fs.dir);
1904
1905 /* Ran out of buffer. Set dir back to old position and return */
1906 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1907 v9fs_string_free(&name);
1908 return count;
1909 }
1910 /*
1911 * Fill up just the path field of qid because the client uses
1912 * only that. To fill the entire qid structure we will have
1913 * to stat each dirent found, which is expensive
1914 */
1915 size = MIN(sizeof(dent->d_ino), sizeof(qid.path));
1916 memcpy(&qid.path, &dent->d_ino, size);
1917 /* Fill the other fields with dummy values */
1918 qid.type = 0;
1919 qid.version = 0;
1920
1921 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1922 len = pdu_marshal(pdu, 11 + count, "Qqbs",
1923 &qid, dent->d_off,
1924 dent->d_type, &name);
1925
1926 v9fs_readdir_unlock(&fidp->fs.dir);
1927
1928 if (len < 0) {
1929 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1930 v9fs_string_free(&name);
1931 return len;
1932 }
1933 count += len;
1934 v9fs_string_free(&name);
1935 saved_dir_pos = dent->d_off;
1936 }
1937
1938 v9fs_readdir_unlock(&fidp->fs.dir);
1939
1940 if (err < 0) {
1941 return err;
1942 }
1943 return count;
1944 }
1945
1946 static void coroutine_fn v9fs_readdir(void *opaque)
1947 {
1948 int32_t fid;
1949 V9fsFidState *fidp;
1950 ssize_t retval = 0;
1951 size_t offset = 7;
1952 uint64_t initial_offset;
1953 int32_t count;
1954 uint32_t max_count;
1955 V9fsPDU *pdu = opaque;
1956
1957 retval = pdu_unmarshal(pdu, offset, "dqd", &fid,
1958 &initial_offset, &max_count);
1959 if (retval < 0) {
1960 goto out_nofid;
1961 }
1962 trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count);
1963
1964 fidp = get_fid(pdu, fid);
1965 if (fidp == NULL) {
1966 retval = -EINVAL;
1967 goto out_nofid;
1968 }
1969 if (!fidp->fs.dir.stream) {
1970 retval = -EINVAL;
1971 goto out;
1972 }
1973 if (initial_offset == 0) {
1974 v9fs_co_rewinddir(pdu, fidp);
1975 } else {
1976 v9fs_co_seekdir(pdu, fidp, initial_offset);
1977 }
1978 count = v9fs_do_readdir(pdu, fidp, max_count);
1979 if (count < 0) {
1980 retval = count;
1981 goto out;
1982 }
1983 retval = pdu_marshal(pdu, offset, "d", count);
1984 if (retval < 0) {
1985 goto out;
1986 }
1987 retval += count + offset;
1988 trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval);
1989 out:
1990 put_fid(pdu, fidp);
1991 out_nofid:
1992 pdu_complete(pdu, retval);
1993 }
1994
1995 static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
1996 uint64_t off, uint32_t count,
1997 struct iovec *sg, int cnt)
1998 {
1999 int i, to_copy;
2000 ssize_t err = 0;
2001 uint64_t write_count;
2002 size_t offset = 7;
2003
2004
2005 if (fidp->fs.xattr.len < off) {
2006 err = -ENOSPC;
2007 goto out;
2008 }
2009 write_count = fidp->fs.xattr.len - off;
2010 if (write_count > count) {
2011 write_count = count;
2012 }
2013 err = pdu_marshal(pdu, offset, "d", write_count);
2014 if (err < 0) {
2015 return err;
2016 }
2017 err += offset;
2018 fidp->fs.xattr.copied_len += write_count;
2019 /*
2020 * Now copy the content from sg list
2021 */
2022 for (i = 0; i < cnt; i++) {
2023 if (write_count > sg[i].iov_len) {
2024 to_copy = sg[i].iov_len;
2025 } else {
2026 to_copy = write_count;
2027 }
2028 memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy);
2029 /* updating vs->off since we are not using below */
2030 off += to_copy;
2031 write_count -= to_copy;
2032 }
2033 out:
2034 return err;
2035 }
2036
2037 static void coroutine_fn v9fs_write(void *opaque)
2038 {
2039 ssize_t err;
2040 int32_t fid;
2041 uint64_t off;
2042 uint32_t count;
2043 int32_t len = 0;
2044 int32_t total = 0;
2045 size_t offset = 7;
2046 V9fsFidState *fidp;
2047 V9fsPDU *pdu = opaque;
2048 V9fsState *s = pdu->s;
2049 QEMUIOVector qiov_full;
2050 QEMUIOVector qiov;
2051
2052 err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count);
2053 if (err < 0) {
2054 pdu_complete(pdu, err);
2055 return;
2056 }
2057 offset += err;
2058 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true);
2059 trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov);
2060
2061 fidp = get_fid(pdu, fid);
2062 if (fidp == NULL) {
2063 err = -EINVAL;
2064 goto out_nofid;
2065 }
2066 if (fidp->fid_type == P9_FID_FILE) {
2067 if (fidp->fs.fd == -1) {
2068 err = -EINVAL;
2069 goto out;
2070 }
2071 } else if (fidp->fid_type == P9_FID_XATTR) {
2072 /*
2073 * setxattr operation
2074 */
2075 err = v9fs_xattr_write(s, pdu, fidp, off, count,
2076 qiov_full.iov, qiov_full.niov);
2077 goto out;
2078 } else {
2079 err = -EINVAL;
2080 goto out;
2081 }
2082 qemu_iovec_init(&qiov, qiov_full.niov);
2083 do {
2084 qemu_iovec_reset(&qiov);
2085 qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total);
2086 if (0) {
2087 print_sg(qiov.iov, qiov.niov);
2088 }
2089 /* Loop in case of EINTR */
2090 do {
2091 len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off);
2092 if (len >= 0) {
2093 off += len;
2094 total += len;
2095 }
2096 } while (len == -EINTR && !pdu->cancelled);
2097 if (len < 0) {
2098 /* IO error return the error */
2099 err = len;
2100 goto out_qiov;
2101 }
2102 } while (total < count && len > 0);
2103
2104 offset = 7;
2105 err = pdu_marshal(pdu, offset, "d", total);
2106 if (err < 0) {
2107 goto out_qiov;
2108 }
2109 err += offset;
2110 trace_v9fs_write_return(pdu->tag, pdu->id, total, err);
2111 out_qiov:
2112 qemu_iovec_destroy(&qiov);
2113 out:
2114 put_fid(pdu, fidp);
2115 out_nofid:
2116 qemu_iovec_destroy(&qiov_full);
2117 pdu_complete(pdu, err);
2118 }
2119
2120 static void coroutine_fn v9fs_create(void *opaque)
2121 {
2122 int32_t fid;
2123 int err = 0;
2124 size_t offset = 7;
2125 V9fsFidState *fidp;
2126 V9fsQID qid;
2127 int32_t perm;
2128 int8_t mode;
2129 V9fsPath path;
2130 struct stat stbuf;
2131 V9fsString name;
2132 V9fsString extension;
2133 int iounit;
2134 V9fsPDU *pdu = opaque;
2135
2136 v9fs_path_init(&path);
2137 v9fs_string_init(&name);
2138 v9fs_string_init(&extension);
2139 err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name,
2140 &perm, &mode, &extension);
2141 if (err < 0) {
2142 goto out_nofid;
2143 }
2144 trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode);
2145
2146 if (name_is_illegal(name.data)) {
2147 err = -ENOENT;
2148 goto out_nofid;
2149 }
2150
2151 if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
2152 err = -EEXIST;
2153 goto out_nofid;
2154 }
2155
2156 fidp = get_fid(pdu, fid);
2157 if (fidp == NULL) {
2158 err = -EINVAL;
2159 goto out_nofid;
2160 }
2161 if (fidp->fid_type != P9_FID_NONE) {
2162 err = -EINVAL;
2163 goto out;
2164 }
2165 if (perm & P9_STAT_MODE_DIR) {
2166 err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777,
2167 fidp->uid, -1, &stbuf);
2168 if (err < 0) {
2169 goto out;
2170 }
2171 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2172 if (err < 0) {
2173 goto out;
2174 }
2175 v9fs_path_copy(&fidp->path, &path);
2176 err = v9fs_co_opendir(pdu, fidp);
2177 if (err < 0) {
2178 goto out;
2179 }
2180 fidp->fid_type = P9_FID_DIR;
2181 } else if (perm & P9_STAT_MODE_SYMLINK) {
2182 err = v9fs_co_symlink(pdu, fidp, &name,
2183 extension.data, -1 , &stbuf);
2184 if (err < 0) {
2185 goto out;
2186 }
2187 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2188 if (err < 0) {
2189 goto out;
2190 }
2191 v9fs_path_copy(&fidp->path, &path);
2192 } else if (perm & P9_STAT_MODE_LINK) {
2193 int32_t ofid = atoi(extension.data);
2194 V9fsFidState *ofidp = get_fid(pdu, ofid);
2195 if (ofidp == NULL) {
2196 err = -EINVAL;
2197 goto out;
2198 }
2199 err = v9fs_co_link(pdu, ofidp, fidp, &name);
2200 put_fid(pdu, ofidp);
2201 if (err < 0) {
2202 goto out;
2203 }
2204 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2205 if (err < 0) {
2206 fidp->fid_type = P9_FID_NONE;
2207 goto out;
2208 }
2209 v9fs_path_copy(&fidp->path, &path);
2210 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
2211 if (err < 0) {
2212 fidp->fid_type = P9_FID_NONE;
2213 goto out;
2214 }
2215 } else if (perm & P9_STAT_MODE_DEVICE) {
2216 char ctype;
2217 uint32_t major, minor;
2218 mode_t nmode = 0;
2219
2220 if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) {
2221 err = -errno;
2222 goto out;
2223 }
2224
2225 switch (ctype) {
2226 case 'c':
2227 nmode = S_IFCHR;
2228 break;
2229 case 'b':
2230 nmode = S_IFBLK;
2231 break;
2232 default:
2233 err = -EIO;
2234 goto out;
2235 }
2236
2237 nmode |= perm & 0777;
2238 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2239 makedev(major, minor), nmode, &stbuf);
2240 if (err < 0) {
2241 goto out;
2242 }
2243 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2244 if (err < 0) {
2245 goto out;
2246 }
2247 v9fs_path_copy(&fidp->path, &path);
2248 } else if (perm & P9_STAT_MODE_NAMED_PIPE) {
2249 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2250 0, S_IFIFO | (perm & 0777), &stbuf);
2251 if (err < 0) {
2252 goto out;
2253 }
2254 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2255 if (err < 0) {
2256 goto out;
2257 }
2258 v9fs_path_copy(&fidp->path, &path);
2259 } else if (perm & P9_STAT_MODE_SOCKET) {
2260 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2261 0, S_IFSOCK | (perm & 0777), &stbuf);
2262 if (err < 0) {
2263 goto out;
2264 }
2265 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2266 if (err < 0) {
2267 goto out;
2268 }
2269 v9fs_path_copy(&fidp->path, &path);
2270 } else {
2271 err = v9fs_co_open2(pdu, fidp, &name, -1,
2272 omode_to_uflags(mode)|O_CREAT, perm, &stbuf);
2273 if (err < 0) {
2274 goto out;
2275 }
2276 fidp->fid_type = P9_FID_FILE;
2277 fidp->open_flags = omode_to_uflags(mode);
2278 if (fidp->open_flags & O_EXCL) {
2279 /*
2280 * We let the host file system do O_EXCL check
2281 * We should not reclaim such fd
2282 */
2283 fidp->flags |= FID_NON_RECLAIMABLE;
2284 }
2285 }
2286 iounit = get_iounit(pdu, &fidp->path);
2287 stat_to_qid(&stbuf, &qid);
2288 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
2289 if (err < 0) {
2290 goto out;
2291 }
2292 err += offset;
2293 trace_v9fs_create_return(pdu->tag, pdu->id,
2294 qid.type, qid.version, qid.path, iounit);
2295 out:
2296 put_fid(pdu, fidp);
2297 out_nofid:
2298 pdu_complete(pdu, err);
2299 v9fs_string_free(&name);
2300 v9fs_string_free(&extension);
2301 v9fs_path_free(&path);
2302 }
2303
2304 static void coroutine_fn v9fs_symlink(void *opaque)
2305 {
2306 V9fsPDU *pdu = opaque;
2307 V9fsString name;
2308 V9fsString symname;
2309 V9fsFidState *dfidp;
2310 V9fsQID qid;
2311 struct stat stbuf;
2312 int32_t dfid;
2313 int err = 0;
2314 gid_t gid;
2315 size_t offset = 7;
2316
2317 v9fs_string_init(&name);
2318 v9fs_string_init(&symname);
2319 err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid);
2320 if (err < 0) {
2321 goto out_nofid;
2322 }
2323 trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid);
2324
2325 if (name_is_illegal(name.data)) {
2326 err = -ENOENT;
2327 goto out_nofid;
2328 }
2329
2330 if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
2331 err = -EEXIST;
2332 goto out_nofid;
2333 }
2334
2335 dfidp = get_fid(pdu, dfid);
2336 if (dfidp == NULL) {
2337 err = -EINVAL;
2338 goto out_nofid;
2339 }
2340 err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf);
2341 if (err < 0) {
2342 goto out;
2343 }
2344 stat_to_qid(&stbuf, &qid);
2345 err = pdu_marshal(pdu, offset, "Q", &qid);
2346 if (err < 0) {
2347 goto out;
2348 }
2349 err += offset;
2350 trace_v9fs_symlink_return(pdu->tag, pdu->id,
2351 qid.type, qid.version, qid.path);
2352 out:
2353 put_fid(pdu, dfidp);
2354 out_nofid:
2355 pdu_complete(pdu, err);
2356 v9fs_string_free(&name);
2357 v9fs_string_free(&symname);
2358 }
2359
2360 static void coroutine_fn v9fs_flush(void *opaque)
2361 {
2362 ssize_t err;
2363 int16_t tag;
2364 size_t offset = 7;
2365 V9fsPDU *cancel_pdu = NULL;
2366 V9fsPDU *pdu = opaque;
2367 V9fsState *s = pdu->s;
2368
2369 err = pdu_unmarshal(pdu, offset, "w", &tag);
2370 if (err < 0) {
2371 pdu_complete(pdu, err);
2372 return;
2373 }
2374 trace_v9fs_flush(pdu->tag, pdu->id, tag);
2375
2376 if (pdu->tag == tag) {
2377 error_report("Warning: the guest sent a self-referencing 9P flush request");
2378 } else {
2379 QLIST_FOREACH(cancel_pdu, &s->active_list, next) {
2380 if (cancel_pdu->tag == tag) {
2381 break;
2382 }
2383 }
2384 }
2385 if (cancel_pdu) {
2386 cancel_pdu->cancelled = 1;
2387 /*
2388 * Wait for pdu to complete.
2389 */
2390 qemu_co_queue_wait(&cancel_pdu->complete, NULL);
2391 if (!qemu_co_queue_next(&cancel_pdu->complete)) {
2392 cancel_pdu->cancelled = 0;
2393 pdu_free(cancel_pdu);
2394 }
2395 }
2396 pdu_complete(pdu, 7);
2397 }
2398
2399 static void coroutine_fn v9fs_link(void *opaque)
2400 {
2401 V9fsPDU *pdu = opaque;
2402 int32_t dfid, oldfid;
2403 V9fsFidState *dfidp, *oldfidp;
2404 V9fsString name;
2405 size_t offset = 7;
2406 int err = 0;
2407
2408 v9fs_string_init(&name);
2409 err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name);
2410 if (err < 0) {
2411 goto out_nofid;
2412 }
2413 trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data);
2414
2415 if (name_is_illegal(name.data)) {
2416 err = -ENOENT;
2417 goto out_nofid;
2418 }
2419
2420 if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
2421 err = -EEXIST;
2422 goto out_nofid;
2423 }
2424
2425 dfidp = get_fid(pdu, dfid);
2426 if (dfidp == NULL) {
2427 err = -ENOENT;
2428 goto out_nofid;
2429 }
2430
2431 oldfidp = get_fid(pdu, oldfid);
2432 if (oldfidp == NULL) {
2433 err = -ENOENT;
2434 goto out;
2435 }
2436 err = v9fs_co_link(pdu, oldfidp, dfidp, &name);
2437 if (!err) {
2438 err = offset;
2439 }
2440 put_fid(pdu, oldfidp);
2441 out:
2442 put_fid(pdu, dfidp);
2443 out_nofid:
2444 v9fs_string_free(&name);
2445 pdu_complete(pdu, err);
2446 }
2447
2448 /* Only works with path name based fid */
2449 static void coroutine_fn v9fs_remove(void *opaque)
2450 {
2451 int32_t fid;
2452 int err = 0;
2453 size_t offset = 7;
2454 V9fsFidState *fidp;
2455 V9fsPDU *pdu = opaque;
2456
2457 err = pdu_unmarshal(pdu, offset, "d", &fid);
2458 if (err < 0) {
2459 goto out_nofid;
2460 }
2461 trace_v9fs_remove(pdu->tag, pdu->id, fid);
2462
2463 fidp = get_fid(pdu, fid);
2464 if (fidp == NULL) {
2465 err = -EINVAL;
2466 goto out_nofid;
2467 }
2468 /* if fs driver is not path based, return EOPNOTSUPP */
2469 if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) {
2470 err = -EOPNOTSUPP;
2471 goto out_err;
2472 }
2473 /*
2474 * IF the file is unlinked, we cannot reopen
2475 * the file later. So don't reclaim fd
2476 */
2477 err = v9fs_mark_fids_unreclaim(pdu, &fidp->path);
2478 if (err < 0) {
2479 goto out_err;
2480 }
2481 err = v9fs_co_remove(pdu, &fidp->path);
2482 if (!err) {
2483 err = offset;
2484 }
2485 out_err:
2486 /* For TREMOVE we need to clunk the fid even on failed remove */
2487 clunk_fid(pdu->s, fidp->fid);
2488 put_fid(pdu, fidp);
2489 out_nofid:
2490 pdu_complete(pdu, err);
2491 }
2492
2493 static void coroutine_fn v9fs_unlinkat(void *opaque)
2494 {
2495 int err = 0;
2496 V9fsString name;
2497 int32_t dfid, flags;
2498 size_t offset = 7;
2499 V9fsPath path;
2500 V9fsFidState *dfidp;
2501 V9fsPDU *pdu = opaque;
2502
2503 v9fs_string_init(&name);
2504 err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags);
2505 if (err < 0) {
2506 goto out_nofid;
2507 }
2508
2509 if (name_is_illegal(name.data)) {
2510 err = -ENOENT;
2511 goto out_nofid;
2512 }
2513
2514 if (!strcmp(".", name.data)) {
2515 err = -EINVAL;
2516 goto out_nofid;
2517 }
2518
2519 if (!strcmp("..", name.data)) {
2520 err = -ENOTEMPTY;
2521 goto out_nofid;
2522 }
2523
2524 dfidp = get_fid(pdu, dfid);
2525 if (dfidp == NULL) {
2526 err = -EINVAL;
2527 goto out_nofid;
2528 }
2529 /*
2530 * IF the file is unlinked, we cannot reopen
2531 * the file later. So don't reclaim fd
2532 */
2533 v9fs_path_init(&path);
2534 err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path);
2535 if (err < 0) {
2536 goto out_err;
2537 }
2538 err = v9fs_mark_fids_unreclaim(pdu, &path);
2539 if (err < 0) {
2540 goto out_err;
2541 }
2542 err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, flags);
2543 if (!err) {
2544 err = offset;
2545 }
2546 out_err:
2547 put_fid(pdu, dfidp);
2548 v9fs_path_free(&path);
2549 out_nofid:
2550 pdu_complete(pdu, err);
2551 v9fs_string_free(&name);
2552 }
2553
2554
2555 /* Only works with path name based fid */
2556 static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
2557 int32_t newdirfid,
2558 V9fsString *name)
2559 {
2560 char *end;
2561 int err = 0;
2562 V9fsPath new_path;
2563 V9fsFidState *tfidp;
2564 V9fsState *s = pdu->s;
2565 V9fsFidState *dirfidp = NULL;
2566 char *old_name, *new_name;
2567
2568 v9fs_path_init(&new_path);
2569 if (newdirfid != -1) {
2570 dirfidp = get_fid(pdu, newdirfid);
2571 if (dirfidp == NULL) {
2572 err = -ENOENT;
2573 goto out_nofid;
2574 }
2575 if (fidp->fid_type != P9_FID_NONE) {
2576 err = -EINVAL;
2577 goto out;
2578 }
2579 v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
2580 } else {
2581 old_name = fidp->path.data;
2582 end = strrchr(old_name, '/');
2583 if (end) {
2584 end++;
2585 } else {
2586 end = old_name;
2587 }
2588 new_name = g_malloc0(end - old_name + name->size + 1);
2589 strncat(new_name, old_name, end - old_name);
2590 strncat(new_name + (end - old_name), name->data, name->size);
2591 v9fs_co_name_to_path(pdu, NULL, new_name, &new_path);
2592 g_free(new_name);
2593 }
2594 err = v9fs_co_rename(pdu, &fidp->path, &new_path);
2595 if (err < 0) {
2596 goto out;
2597 }
2598 /*
2599 * Fixup fid's pointing to the old name to
2600 * start pointing to the new name
2601 */
2602 for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
2603 if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) {
2604 /* replace the name */
2605 v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data));
2606 }
2607 }
2608 out:
2609 if (dirfidp) {
2610 put_fid(pdu, dirfidp);
2611 }
2612 v9fs_path_free(&new_path);
2613 out_nofid:
2614 return err;
2615 }
2616
2617 /* Only works with path name based fid */
2618 static void coroutine_fn v9fs_rename(void *opaque)
2619 {
2620 int32_t fid;
2621 ssize_t err = 0;
2622 size_t offset = 7;
2623 V9fsString name;
2624 int32_t newdirfid;
2625 V9fsFidState *fidp;
2626 V9fsPDU *pdu = opaque;
2627 V9fsState *s = pdu->s;
2628
2629 v9fs_string_init(&name);
2630 err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name);
2631 if (err < 0) {
2632 goto out_nofid;
2633 }
2634
2635 if (name_is_illegal(name.data)) {
2636 err = -ENOENT;
2637 goto out_nofid;
2638 }
2639
2640 if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
2641 err = -EISDIR;
2642 goto out_nofid;
2643 }
2644
2645 fidp = get_fid(pdu, fid);
2646 if (fidp == NULL) {
2647 err = -ENOENT;
2648 goto out_nofid;
2649 }
2650 if (fidp->fid_type != P9_FID_NONE) {
2651 err = -EINVAL;
2652 goto out;
2653 }
2654 /* if fs driver is not path based, return EOPNOTSUPP */
2655 if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) {
2656 err = -EOPNOTSUPP;
2657 goto out;
2658 }
2659 v9fs_path_write_lock(s);
2660 err = v9fs_complete_rename(pdu, fidp, newdirfid, &name);
2661 v9fs_path_unlock(s);
2662 if (!err) {
2663 err = offset;
2664 }
2665 out:
2666 put_fid(pdu, fidp);
2667 out_nofid:
2668 pdu_complete(pdu, err);
2669 v9fs_string_free(&name);
2670 }
2671
2672 static void coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
2673 V9fsString *old_name,
2674 V9fsPath *newdir,
2675 V9fsString *new_name)
2676 {
2677 V9fsFidState *tfidp;
2678 V9fsPath oldpath, newpath;
2679 V9fsState *s = pdu->s;
2680
2681
2682 v9fs_path_init(&oldpath);
2683 v9fs_path_init(&newpath);
2684 v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath);
2685 v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath);
2686
2687 /*
2688 * Fixup fid's pointing to the old name to
2689 * start pointing to the new name
2690 */
2691 for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
2692 if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) {
2693 /* replace the name */
2694 v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data));
2695 }
2696 }
2697 v9fs_path_free(&oldpath);
2698 v9fs_path_free(&newpath);
2699 }
2700
2701 static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid,
2702 V9fsString *old_name,
2703 int32_t newdirfid,
2704 V9fsString *new_name)
2705 {
2706 int err = 0;
2707 V9fsState *s = pdu->s;
2708 V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL;
2709
2710 olddirfidp = get_fid(pdu, olddirfid);
2711 if (olddirfidp == NULL) {
2712 err = -ENOENT;
2713 goto out;
2714 }
2715 if (newdirfid != -1) {
2716 newdirfidp = get_fid(pdu, newdirfid);
2717 if (newdirfidp == NULL) {
2718 err = -ENOENT;
2719 goto out;
2720 }
2721 } else {
2722 newdirfidp = get_fid(pdu, olddirfid);
2723 }
2724
2725 err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name,
2726 &newdirfidp->path, new_name);
2727 if (err < 0) {
2728 goto out;
2729 }
2730 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
2731 /* Only for path based fid we need to do the below fixup */
2732 v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name,
2733 &newdirfidp->path, new_name);
2734 }
2735 out:
2736 if (olddirfidp) {
2737 put_fid(pdu, olddirfidp);
2738 }
2739 if (newdirfidp) {
2740 put_fid(pdu, newdirfidp);
2741 }
2742 return err;
2743 }
2744
2745 static void coroutine_fn v9fs_renameat(void *opaque)
2746 {
2747 ssize_t err = 0;
2748 size_t offset = 7;
2749 V9fsPDU *pdu = opaque;
2750 V9fsState *s = pdu->s;
2751 int32_t olddirfid, newdirfid;
2752 V9fsString old_name, new_name;
2753
2754 v9fs_string_init(&old_name);
2755 v9fs_string_init(&new_name);
2756 err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid,
2757 &old_name, &newdirfid, &new_name);
2758 if (err < 0) {
2759 goto out_err;
2760 }
2761
2762 if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) {
2763 err = -ENOENT;
2764 goto out_err;
2765 }
2766
2767 if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) ||
2768 !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) {
2769 err = -EISDIR;
2770 goto out_err;
2771 }
2772
2773 v9fs_path_write_lock(s);
2774 err = v9fs_complete_renameat(pdu, olddirfid,
2775 &old_name, newdirfid, &new_name);
2776 v9fs_path_unlock(s);
2777 if (!err) {
2778 err = offset;
2779 }
2780
2781 out_err:
2782 pdu_complete(pdu, err);
2783 v9fs_string_free(&old_name);
2784 v9fs_string_free(&new_name);
2785 }
2786
2787 static void coroutine_fn v9fs_wstat(void *opaque)
2788 {
2789 int32_t fid;
2790 int err = 0;
2791 int16_t unused;
2792 V9fsStat v9stat;
2793 size_t offset = 7;
2794 struct stat stbuf;
2795 V9fsFidState *fidp;
2796 V9fsPDU *pdu = opaque;
2797
2798 v9fs_stat_init(&v9stat);
2799 err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat);
2800 if (err < 0) {
2801 goto out_nofid;
2802 }
2803 trace_v9fs_wstat(pdu->tag, pdu->id, fid,
2804 v9stat.mode, v9stat.atime, v9stat.mtime);
2805
2806 fidp = get_fid(pdu, fid);
2807 if (fidp == NULL) {
2808 err = -EINVAL;
2809 goto out_nofid;
2810 }
2811 /* do we need to sync the file? */
2812 if (donttouch_stat(&v9stat)) {
2813 err = v9fs_co_fsync(pdu, fidp, 0);
2814 goto out;
2815 }
2816 if (v9stat.mode != -1) {
2817 uint32_t v9_mode;
2818 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
2819 if (err < 0) {
2820 goto out;
2821 }
2822 v9_mode = stat_to_v9mode(&stbuf);
2823 if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) !=
2824 (v9_mode & P9_STAT_MODE_TYPE_BITS)) {
2825 /* Attempting to change the type */
2826 err = -EIO;
2827 goto out;
2828 }
2829 err = v9fs_co_chmod(pdu, &fidp->path,
2830 v9mode_to_mode(v9stat.mode,
2831 &v9stat.extension));
2832 if (err < 0) {
2833 goto out;
2834 }
2835 }
2836 if (v9stat.mtime != -1 || v9stat.atime != -1) {
2837 struct timespec times[2];
2838 if (v9stat.atime != -1) {
2839 times[0].tv_sec = v9stat.atime;
2840 times[0].tv_nsec = 0;
2841 } else {
2842 times[0].tv_nsec = UTIME_OMIT;
2843 }
2844 if (v9stat.mtime != -1) {
2845 times[1].tv_sec = v9stat.mtime;
2846 times[1].tv_nsec = 0;
2847 } else {
2848 times[1].tv_nsec = UTIME_OMIT;
2849 }
2850 err = v9fs_co_utimensat(pdu, &fidp->path, times);
2851 if (err < 0) {
2852 goto out;
2853 }
2854 }
2855 if (v9stat.n_gid != -1 || v9stat.n_uid != -1) {
2856 err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid);
2857 if (err < 0) {
2858 goto out;
2859 }
2860 }
2861 if (v9stat.name.size != 0) {
2862 err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name);
2863 if (err < 0) {
2864 goto out;
2865 }
2866 }
2867 if (v9stat.length != -1) {
2868 err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length);
2869 if (err < 0) {
2870 goto out;
2871 }
2872 }
2873 err = offset;
2874 out:
2875 put_fid(pdu, fidp);
2876 out_nofid:
2877 v9fs_stat_free(&v9stat);
2878 pdu_complete(pdu, err);
2879 }
2880
2881 static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf)
2882 {
2883 uint32_t f_type;
2884 uint32_t f_bsize;
2885 uint64_t f_blocks;
2886 uint64_t f_bfree;
2887 uint64_t f_bavail;
2888 uint64_t f_files;
2889 uint64_t f_ffree;
2890 uint64_t fsid_val;
2891 uint32_t f_namelen;
2892 size_t offset = 7;
2893 int32_t bsize_factor;
2894
2895 /*
2896 * compute bsize factor based on host file system block size
2897 * and client msize
2898 */
2899 bsize_factor = (s->msize - P9_IOHDRSZ)/stbuf->f_bsize;
2900 if (!bsize_factor) {
2901 bsize_factor = 1;
2902 }
2903 f_type = stbuf->f_type;
2904 f_bsize = stbuf->f_bsize;
2905 f_bsize *= bsize_factor;
2906 /*
2907 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
2908 * adjust(divide) the number of blocks, free blocks and available
2909 * blocks by bsize factor
2910 */
2911 f_blocks = stbuf->f_blocks/bsize_factor;
2912 f_bfree = stbuf->f_bfree/bsize_factor;
2913 f_bavail = stbuf->f_bavail/bsize_factor;
2914 f_files = stbuf->f_files;
2915 f_ffree = stbuf->f_ffree;
2916 fsid_val = (unsigned int) stbuf->f_fsid.__val[0] |
2917 (unsigned long long)stbuf->f_fsid.__val[1] << 32;
2918 f_namelen = stbuf->f_namelen;
2919
2920 return pdu_marshal(pdu, offset, "ddqqqqqqd",
2921 f_type, f_bsize, f_blocks, f_bfree,
2922 f_bavail, f_files, f_ffree,
2923 fsid_val, f_namelen);
2924 }
2925
2926 static void coroutine_fn v9fs_statfs(void *opaque)
2927 {
2928 int32_t fid;
2929 ssize_t retval = 0;
2930 size_t offset = 7;
2931 V9fsFidState *fidp;
2932 struct statfs stbuf;
2933 V9fsPDU *pdu = opaque;
2934 V9fsState *s = pdu->s;
2935
2936 retval = pdu_unmarshal(pdu, offset, "d", &fid);
2937 if (retval < 0) {
2938 goto out_nofid;
2939 }
2940 fidp = get_fid(pdu, fid);
2941 if (fidp == NULL) {
2942 retval = -ENOENT;
2943 goto out_nofid;
2944 }
2945 retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf);
2946 if (retval < 0) {
2947 goto out;
2948 }
2949 retval = v9fs_fill_statfs(s, pdu, &stbuf);
2950 if (retval < 0) {
2951 goto out;
2952 }
2953 retval += offset;
2954 out:
2955 put_fid(pdu, fidp);
2956 out_nofid:
2957 pdu_complete(pdu, retval);
2958 }
2959
2960 static void coroutine_fn v9fs_mknod(void *opaque)
2961 {
2962
2963 int mode;
2964 gid_t gid;
2965 int32_t fid;
2966 V9fsQID qid;
2967 int err = 0;
2968 int major, minor;
2969 size_t offset = 7;
2970 V9fsString name;
2971 struct stat stbuf;
2972 V9fsFidState *fidp;
2973 V9fsPDU *pdu = opaque;
2974
2975 v9fs_string_init(&name);
2976 err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode,
2977 &major, &minor, &gid);
2978 if (err < 0) {
2979 goto out_nofid;
2980 }
2981 trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor);
2982
2983 if (name_is_illegal(name.data)) {
2984 err = -ENOENT;
2985 goto out_nofid;
2986 }
2987
2988 if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
2989 err = -EEXIST;
2990 goto out_nofid;
2991 }
2992
2993 fidp = get_fid(pdu, fid);
2994 if (fidp == NULL) {
2995 err = -ENOENT;
2996 goto out_nofid;
2997 }
2998 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid,
2999 makedev(major, minor), mode, &stbuf);
3000 if (err < 0) {
3001 goto out;
3002 }
3003 stat_to_qid(&stbuf, &qid);
3004 err = pdu_marshal(pdu, offset, "Q", &qid);
3005 if (err < 0) {
3006 goto out;
3007 }
3008 err += offset;
3009 trace_v9fs_mknod_return(pdu->tag, pdu->id,
3010 qid.type, qid.version, qid.path);
3011 out:
3012 put_fid(pdu, fidp);
3013 out_nofid:
3014 pdu_complete(pdu, err);
3015 v9fs_string_free(&name);
3016 }
3017
3018 /*
3019 * Implement posix byte range locking code
3020 * Server side handling of locking code is very simple, because 9p server in
3021 * QEMU can handle only one client. And most of the lock handling
3022 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
3023 * do any thing in * qemu 9p server side lock code path.
3024 * So when a TLOCK request comes, always return success
3025 */
3026 static void coroutine_fn v9fs_lock(void *opaque)
3027 {
3028 V9fsFlock flock;
3029 size_t offset = 7;
3030 struct stat stbuf;
3031 V9fsFidState *fidp;
3032 int32_t fid, err = 0;
3033 V9fsPDU *pdu = opaque;
3034
3035 v9fs_string_init(&flock.client_id);
3036 err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type,
3037 &flock.flags, &flock.start, &flock.length,
3038 &flock.proc_id, &flock.client_id);
3039 if (err < 0) {
3040 goto out_nofid;
3041 }
3042 trace_v9fs_lock(pdu->tag, pdu->id, fid,
3043 flock.type, flock.start, flock.length);
3044
3045
3046 /* We support only block flag now (that too ignored currently) */
3047 if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) {
3048 err = -EINVAL;
3049 goto out_nofid;
3050 }
3051 fidp = get_fid(pdu, fid);
3052 if (fidp == NULL) {
3053 err = -ENOENT;
3054 goto out_nofid;
3055 }
3056 err = v9fs_co_fstat(pdu, fidp, &stbuf);
3057 if (err < 0) {
3058 goto out;
3059 }
3060 err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS);
3061 if (err < 0) {
3062 goto out;
3063 }
3064 err += offset;
3065 trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS);
3066 out:
3067 put_fid(pdu, fidp);
3068 out_nofid:
3069 pdu_complete(pdu, err);
3070 v9fs_string_free(&flock.client_id);
3071 }
3072
3073 /*
3074 * When a TGETLOCK request comes, always return success because all lock
3075 * handling is done by client's VFS layer.
3076 */
3077 static void coroutine_fn v9fs_getlock(void *opaque)
3078 {
3079 size_t offset = 7;
3080 struct stat stbuf;
3081 V9fsFidState *fidp;
3082 V9fsGetlock glock;
3083 int32_t fid, err = 0;
3084 V9fsPDU *pdu = opaque;
3085
3086 v9fs_string_init(&glock.client_id);
3087 err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type,
3088 &glock.start, &glock.length, &glock.proc_id,
3089 &glock.client_id);
3090 if (err < 0) {
3091 goto out_nofid;
3092 }
3093 trace_v9fs_getlock(pdu->tag, pdu->id, fid,
3094 glock.type, glock.start, glock.length);
3095
3096 fidp = get_fid(pdu, fid);
3097 if (fidp == NULL) {
3098 err = -ENOENT;
3099 goto out_nofid;
3100 }
3101 err = v9fs_co_fstat(pdu, fidp, &stbuf);
3102 if (err < 0) {
3103 goto out;
3104 }
3105 glock.type = P9_LOCK_TYPE_UNLCK;
3106 err = pdu_marshal(pdu, offset, "bqqds", glock.type,
3107 glock.start, glock.length, glock.proc_id,
3108 &glock.client_id);
3109 if (err < 0) {
3110 goto out;
3111 }
3112 err += offset;
3113 trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start,
3114 glock.length, glock.proc_id);
3115 out:
3116 put_fid(pdu, fidp);
3117 out_nofid:
3118 pdu_complete(pdu, err);
3119 v9fs_string_free(&glock.client_id);
3120 }
3121
3122 static void coroutine_fn v9fs_mkdir(void *opaque)
3123 {
3124 V9fsPDU *pdu = opaque;
3125 size_t offset = 7;
3126 int32_t fid;
3127 struct stat stbuf;
3128 V9fsQID qid;
3129 V9fsString name;
3130 V9fsFidState *fidp;
3131 gid_t gid;
3132 int mode;
3133 int err = 0;
3134
3135 v9fs_string_init(&name);
3136 err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid);
3137 if (err < 0) {
3138 goto out_nofid;
3139 }
3140 trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid);
3141
3142 if (name_is_illegal(name.data)) {
3143 err = -ENOENT;
3144 goto out_nofid;
3145 }
3146
3147 if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
3148 err = -EEXIST;
3149 goto out_nofid;
3150 }
3151
3152 fidp = get_fid(pdu, fid);
3153 if (fidp == NULL) {
3154 err = -ENOENT;
3155 goto out_nofid;
3156 }
3157 err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf);
3158 if (err < 0) {
3159 goto out;
3160 }
3161 stat_to_qid(&stbuf, &qid);
3162 err = pdu_marshal(pdu, offset, "Q", &qid);
3163 if (err < 0) {
3164 goto out;
3165 }
3166 err += offset;
3167 trace_v9fs_mkdir_return(pdu->tag, pdu->id,
3168 qid.type, qid.version, qid.path, err);
3169 out:
3170 put_fid(pdu, fidp);
3171 out_nofid:
3172 pdu_complete(pdu, err);
3173 v9fs_string_free(&name);
3174 }
3175
3176 static void coroutine_fn v9fs_xattrwalk(void *opaque)
3177 {
3178 int64_t size;
3179 V9fsString name;
3180 ssize_t err = 0;
3181 size_t offset = 7;
3182 int32_t fid, newfid;
3183 V9fsFidState *file_fidp;
3184 V9fsFidState *xattr_fidp = NULL;
3185 V9fsPDU *pdu = opaque;
3186 V9fsState *s = pdu->s;
3187
3188 v9fs_string_init(&name);
3189 err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name);
3190 if (err < 0) {
3191 goto out_nofid;
3192 }
3193 trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data);
3194
3195 file_fidp = get_fid(pdu, fid);
3196 if (file_fidp == NULL) {
3197 err = -ENOENT;
3198 goto out_nofid;
3199 }
3200 xattr_fidp = alloc_fid(s, newfid);
3201 if (xattr_fidp == NULL) {
3202 err = -EINVAL;
3203 goto out;
3204 }
3205 v9fs_path_copy(&xattr_fidp->path, &file_fidp->path);
3206 if (!v9fs_string_size(&name)) {
3207 /*
3208 * listxattr request. Get the size first
3209 */
3210 size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0);
3211 if (size < 0) {
3212 err = size;
3213 clunk_fid(s, xattr_fidp->fid);
3214 goto out;
3215 }
3216 /*
3217 * Read the xattr value
3218 */
3219 xattr_fidp->fs.xattr.len = size;
3220 xattr_fidp->fid_type = P9_FID_XATTR;
3221 xattr_fidp->fs.xattr.xattrwalk_fid = true;
3222 if (size) {
3223 xattr_fidp->fs.xattr.value = g_malloc(size);
3224 err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
3225 xattr_fidp->fs.xattr.value,
3226 xattr_fidp->fs.xattr.len);
3227 if (err < 0) {
3228 clunk_fid(s, xattr_fidp->fid);
3229 goto out;
3230 }
3231 }
3232 err = pdu_marshal(pdu, offset, "q", size);
3233 if (err < 0) {
3234 goto out;
3235 }
3236 err += offset;
3237 } else {
3238 /*
3239 * specific xattr fid. We check for xattr
3240 * presence also collect the xattr size
3241 */
3242 size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
3243 &name, NULL, 0);
3244 if (size < 0) {
3245 err = size;
3246 clunk_fid(s, xattr_fidp->fid);
3247 goto out;
3248 }
3249 /*
3250 * Read the xattr value
3251 */
3252 xattr_fidp->fs.xattr.len = size;
3253 xattr_fidp->fid_type = P9_FID_XATTR;
3254 xattr_fidp->fs.xattr.xattrwalk_fid = true;
3255 if (size) {
3256 xattr_fidp->fs.xattr.value = g_malloc(size);
3257 err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
3258 &name, xattr_fidp->fs.xattr.value,
3259 xattr_fidp->fs.xattr.len);
3260 if (err < 0) {
3261 clunk_fid(s, xattr_fidp->fid);
3262 goto out;
3263 }
3264 }
3265 err = pdu_marshal(pdu, offset, "q", size);
3266 if (err < 0) {
3267 goto out;
3268 }
3269 err += offset;
3270 }
3271 trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size);
3272 out:
3273 put_fid(pdu, file_fidp);
3274 if (xattr_fidp) {
3275 put_fid(pdu, xattr_fidp);
3276 }
3277 out_nofid:
3278 pdu_complete(pdu, err);
3279 v9fs_string_free(&name);
3280 }
3281
3282 static void coroutine_fn v9fs_xattrcreate(void *opaque)
3283 {
3284 int flags;
3285 int32_t fid;
3286 uint64_t size;
3287 ssize_t err = 0;
3288 V9fsString name;
3289 size_t offset = 7;
3290 V9fsFidState *file_fidp;
3291 V9fsFidState *xattr_fidp;
3292 V9fsPDU *pdu = opaque;
3293
3294 v9fs_string_init(&name);
3295 err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags);
3296 if (err < 0) {
3297 goto out_nofid;
3298 }
3299 trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags);
3300
3301 if (size > XATTR_SIZE_MAX) {
3302 err = -E2BIG;
3303 goto out_nofid;
3304 }
3305
3306 file_fidp = get_fid(pdu, fid);
3307 if (file_fidp == NULL) {
3308 err = -EINVAL;
3309 goto out_nofid;
3310 }
3311 if (file_fidp->fid_type != P9_FID_NONE) {
3312 err = -EINVAL;
3313 goto out_put_fid;
3314 }
3315
3316 /* Make the file fid point to xattr */
3317 xattr_fidp = file_fidp;
3318 xattr_fidp->fid_type = P9_FID_XATTR;
3319 xattr_fidp->fs.xattr.copied_len = 0;
3320 xattr_fidp->fs.xattr.xattrwalk_fid = false;
3321 xattr_fidp->fs.xattr.len = size;
3322 xattr_fidp->fs.xattr.flags = flags;
3323 v9fs_string_init(&xattr_fidp->fs.xattr.name);
3324 v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
3325 xattr_fidp->fs.xattr.value = g_malloc0(size);
3326 err = offset;
3327 out_put_fid:
3328 put_fid(pdu, file_fidp);
3329 out_nofid:
3330 pdu_complete(pdu, err);
3331 v9fs_string_free(&name);
3332 }
3333
3334 static void coroutine_fn v9fs_readlink(void *opaque)
3335 {
3336 V9fsPDU *pdu = opaque;
3337 size_t offset = 7;
3338 V9fsString target;
3339 int32_t fid;
3340 int err = 0;
3341 V9fsFidState *fidp;
3342
3343 err = pdu_unmarshal(pdu, offset, "d", &fid);
3344 if (err < 0) {
3345 goto out_nofid;
3346 }
3347 trace_v9fs_readlink(pdu->tag, pdu->id, fid);
3348 fidp = get_fid(pdu, fid);
3349 if (fidp == NULL) {
3350 err = -ENOENT;
3351 goto out_nofid;
3352 }
3353
3354 v9fs_string_init(&target);
3355 err = v9fs_co_readlink(pdu, &fidp->path, &target);
3356 if (err < 0) {
3357 goto out;
3358 }
3359 err = pdu_marshal(pdu, offset, "s", &target);
3360 if (err < 0) {
3361 v9fs_string_free(&target);
3362 goto out;
3363 }
3364 err += offset;
3365 trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data);
3366 v9fs_string_free(&target);
3367 out:
3368 put_fid(pdu, fidp);
3369 out_nofid:
3370 pdu_complete(pdu, err);
3371 }
3372
3373 static CoroutineEntry *pdu_co_handlers[] = {
3374 [P9_TREADDIR] = v9fs_readdir,
3375 [P9_TSTATFS] = v9fs_statfs,
3376 [P9_TGETATTR] = v9fs_getattr,
3377 [P9_TSETATTR] = v9fs_setattr,
3378 [P9_TXATTRWALK] = v9fs_xattrwalk,
3379 [P9_TXATTRCREATE] = v9fs_xattrcreate,
3380 [P9_TMKNOD] = v9fs_mknod,
3381 [P9_TRENAME] = v9fs_rename,
3382 [P9_TLOCK] = v9fs_lock,
3383 [P9_TGETLOCK] = v9fs_getlock,
3384 [P9_TRENAMEAT] = v9fs_renameat,
3385 [P9_TREADLINK] = v9fs_readlink,
3386 [P9_TUNLINKAT] = v9fs_unlinkat,
3387 [P9_TMKDIR] = v9fs_mkdir,
3388 [P9_TVERSION] = v9fs_version,
3389 [P9_TLOPEN] = v9fs_open,
3390 [P9_TATTACH] = v9fs_attach,
3391 [P9_TSTAT] = v9fs_stat,
3392 [P9_TWALK] = v9fs_walk,
3393 [P9_TCLUNK] = v9fs_clunk,
3394 [P9_TFSYNC] = v9fs_fsync,
3395 [P9_TOPEN] = v9fs_open,
3396 [P9_TREAD] = v9fs_read,
3397 #if 0
3398 [P9_TAUTH] = v9fs_auth,
3399 #endif
3400 [P9_TFLUSH] = v9fs_flush,
3401 [P9_TLINK] = v9fs_link,
3402 [P9_TSYMLINK] = v9fs_symlink,
3403 [P9_TCREATE] = v9fs_create,
3404 [P9_TLCREATE] = v9fs_lcreate,
3405 [P9_TWRITE] = v9fs_write,
3406 [P9_TWSTAT] = v9fs_wstat,
3407 [P9_TREMOVE] = v9fs_remove,
3408 };
3409
3410 static void coroutine_fn v9fs_op_not_supp(void *opaque)
3411 {
3412 V9fsPDU *pdu = opaque;
3413 pdu_complete(pdu, -